CN112771272B - Scroll compressor having a discharge port - Google Patents

Abstract

Disclosed herein is a scroll compressor capable of optimizing a position where a load is applied from a support member to an orbiting scroll. The scroll compressor includes: a fixed scroll fixed to an inside of the body; an orbiting scroll configured to orbit in engagement with the fixed scroll; a rotation shaft configured to allow the orbiting scroll to orbit; a holding member configured to hold the fixed scroll from a side opposite to the orbiting scroll; and a support member disposed between the rotation shaft and the holding member to support the orbiting scroll by a load applied to a position away from a center of the orbiting scroll.

Description

scroll compressor

technical field

The present disclosure relates to scroll compressors.

Background technique

The scroll compressor is configured as follows. The sealed container is kept under high pressure. Provided in a sealed container are: a fixed scroll and an orbiting scroll configured such that their spiral wraps (wrap) engage with each other to form a compression chamber on a support plate; a main shaft configured to pass the eccentric shaft portion The orbiting scroll is driven by being inserted into a raised portion provided on the side of the orbiting scroll opposite to the spiral wrap; a compliant frame configured to support the orbiting scroll in the axial direction A scroll while radially supporting a main shaft driving an orbiting scroll on a main shaft portion provided in the main shaft; and a guide frame configured to support a compliant frame in a radial direction so as to be fixed into the hermetic container. Therefore, the orbiting scroll is movable in the axial direction by complying with the sliding movement of the frame with respect to the guide frame in the radial direction (refer to patent documents).

[Related Technical Documents]

[Patent Document]

Japanese patent 5641978 (2014.11.07)

Contents of the invention

technical problem

In a state where the orbiting scroll is supported by the support member (which is arranged between the rotating shaft that allows the orbiting scroll to orbit and the holding member that holds the fixed scroll), when the orbiting scroll is supported by the support member with respect to the holding member In an arrangement in which the orbiting scroll is movable only in the axial direction due to the sliding movement in the axial direction, it is difficult to optimize the position where the load is applied from the support member to the orbiting scroll.

Accordingly, an aspect of the present disclosure is to provide a scroll compressor capable of optimizing a position where a load is applied from a support member to an orbiting scroll.

technical solution to the problem

According to an aspect of the present disclosure, a scroll compressor includes: a fixed scroll fixed to a main body; an orbiting scroll configured to orbit in engagement with the fixed scroll; a rotary shaft configured to allow orbiting The orbiting scroll orbits; a retaining member configured to retain the fixed scroll from a side opposite to the orbiting scroll; and a support member arranged between the rotating shaft and the retaining member to The load at the position of the center of the scroll member is used to support the orbiting scroll member.

The support member may be movable in one direction with respect to the holding member.

The support member is movable in a direction along the rotational axis and is also movable in a rotational direction about an imaginary axis substantially perpendicular to the rotational axis.

The support member may be movable in a direction opposite to a moment generated in the orbiting scroll, among rotation directions about the virtual axis.

The supporting member may be movable in a rotational direction opposite to a moment generated in the orbiting scroll by receiving a reaction force from a specific position on the side of the orbiting scroll instead of a position receiving a load in the rotary shaft, the reaction force The force is in the retaining member against the load received by the orbiting scroll. The specific position may be between an end surface of the rotary shaft bearing of the supporting member on the side of the orbiting scroll and a surface on which the plate of the orbiting scroll engages with the fixed scroll.

The supporting member can be movable in the rotational direction opposite to the moment generated in the orbiting scroll because the minimum clearance with the retaining member on the same side as the orbiting scroll is smaller than in The minimum clearance between the side opposite to the orbiting scroll and the retaining member. The specific position may be between an end surface of the rotary shaft bearing of the supporting member on the side of the orbiting scroll and a surface on which the plate of the orbiting scroll engages with the fixed scroll.

The supporting member may be movable in a rotational direction opposite to a moment generated in the orbiting scroll by contacting a protrusion provided on the holding member.

A part of the support member may have a shape elastically deformable upon contact with a surface on which the plate of the orbiting scroll engages with the fixed scroll due to inclination of the support member.

The scroll compressor may further include an Oldham ring configured to prevent pivoting of the orbiting scroll, and the Oldham ring may be coupled to the orbiting scroll and the support member, the orbiting scroll and A retaining member, or an orbiting scroll and a fixed scroll.

The scroll compressor may further include a sealing mechanism configured to form an inner space between at least the holding member and the supporting member by sealing at least a portion of a gap between the holding member and the supporting member.

The retaining member may be provided with a retaining member internal passage configured to introduce into the internal space refrigerant introduced from a compression chamber formed such that the orbiting scroll engages with the fixed scroll. orbit.

The fixed scroll may be provided with a fixed scroll inner passage configured to move refrigerant from the compression chamber and introduce the refrigerant into the retaining member inner passage.

The fixed scroll may be provided with a fixed scroll internal passage configured to move refrigerant from the compression chamber and introduce the refrigerant into the retaining member internal passage, and the orbiting scroll may provide There is an orbiting scroll inner passage configured to move refrigerant from the compression chamber and introduce refrigerant into the fixed scroll inner passage. In this case, the fixed scroll internal passage may communicate with the orbiting scroll internal passage during at least a part of a cycle in which the orbiting scroll orbits. The fixed scroll internal passage may include an inlet on the track of an outlet of the orbiting scroll internal passage when the orbiting scroll orbits, and an inlet connected to a groove portion that passes through the orbiting scroll. Cover the entire trajectory of the outlet of the inner channel of the orbiting scroll when the member orbits.

Beneficial Effects of the Invention

The position where the load is applied from the support member to the orbiting scroll can be optimized.

Description of drawings

FIG. 1 shows an axial sectional view of a scroll compressor according to an embodiment of the present disclosure;

2 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

3 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

4 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

5 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

Fig. 6 shows an axial sectional view of a scroll compressor according to an embodiment of the present disclosure;

FIG. 7a is a perspective view showing a moment received by the orbiting scroll, and FIG. 7b is a view showing a shape in which the orbiting scroll is about to tilt;

8 shows an axial sectional view of the compression portion and the rotary shaft when the moment applied to the subframe is in the same direction as that applied to the orbiting scroll;

9 shows an axial sectional view of the compression portion and the rotary shaft when the moment applied to the subframe is in a direction opposite to that applied to the orbiting scroll;

Fig. 10 shows an axial cross-sectional view of a compression portion and a rotating shaft according to an implementation of a scroll compressor;

Fig. 11 shows an axial cross-sectional view of a compression portion and a rotating shaft according to an implementation of a scroll compressor;

Figure 12 shows an axial cross-sectional view of the compression section and the rotating shaft according to an implementation of a scroll compressor;

13 shows an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure;

14 is a plan view showing an end portion of a plate of an orbiting scroll in a compression portion when viewed from the top according to a modification of the scroll compressor according to an embodiment of the present disclosure;

15 is a bottom view illustrating a main body portion of a fixed scroll in a compression portion when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure;

16 shows an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure; and

17 is a bottom view of a main body portion of a fixed scroll in a compression portion when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the following detailed description, the terms "front end", "rear end", "upper part", "lower part", "upper end", "lower end" etc. may be defined by the drawings, but the shapes and positions of parts are not affected by the Terminology restrictions.

According to an embodiment, a scroll compressor is provided with: a fixed scroll; an orbiting scroll configured to orbit engaged with the fixed scroll; a rotary shaft configured to allow the orbiting scroll to orbit a holding member configured to hold the fixed scroll on an opposite side of the orbiting scroll; and a supporting member disposed between the rotation shaft and the holding member. The support member supports the orbiting scroll by a load applied to a position away from the center of the orbiting scroll. That is, a support member may be provided to support the orbiting scroll at a position away from the center of the orbiting scroll. As a specific configuration for supporting the orbiting scroll by a load applied to a position of the support member offset from the center of the orbiting scroll, some configurations can be considered. Hereinafter, these configurations will be described as embodiments.

FIG. 1 shows an axial sectional view of a scroll compressor 1 according to an embodiment of the present disclosure.

The scroll compressor 1 is a compressor widely used in air conditioners, refrigerators, and pumps. FIG. 1 is a longitudinal sectional view of a hermetic scroll compressor used in a refrigerant circuit of an air conditioner.

The scroll compressor 1 includes a compression part 10 configured to compress refrigerant, a driving motor 20 configured to drive the compression part 10 , and a housing 30 corresponding to a body configured to receive the compression part 10 and the driving motor 20 . According to an embodiment, the scroll compressor 1 is a vertical scroll compressor in which an axial direction of a rotation shaft 23 to be described later of the drive motor 20 coincides with a gravity direction. Hereinafter, the axial direction of the rotation shaft 23 will be referred to as "vertical direction", and based on FIG. 1 , the higher side may be referred to as "upper side" and the lower side may be referred to as "lower side". Although a vertical scroll compressor is described as an example, embodiments of the present disclosure will be applicable to a horizontal scroll compressor.

First, the compression section 10 will be described.

The compression part 10 includes: a fixed scroll 11 fixed to a casing 30; an orbiting scroll 12 orbiting by being engaged with the fixed scroll 11; a main frame 13 fixed to the casing 30 and configured to support a fixed a scroll 11; a subframe 14 arranged in a space surrounded by the orbiting scroll and the main frame 13 and configured to support the orbiting scroll 12; and an Oldham ring 15 configured to The orbiting scroll 12 is allowed to orbit without pivoting the orbiting scroll 12 .

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 protruding from the fixed scroll body. The fixed wrap 114 may protrude downwardly from the fixed scroll body.

The fixed scroll body may include a cylindrical body portion 111 , a plate 112 configured to cover an opening in an upper side of the body portion 111 , and a protrusion 113 extending in a radially outward direction from a lower end of the body portion 111 . The fixed roll 114 may protrude downward from a lower portion of the plate 112 and have a spiral shape when viewed from the bottom.

The fixed scroll 11 may be formed from cast iron, such as gray cast iron FC 250 .

The body part 111 may be provided with a through hole 111a in a radial direction. The through hole 111 a may serve as a suction port configured to suck refrigerant into a space surrounded by the main body portion 111 , the plate 112 and the orbiting scroll 12 .

A through hole 112 a in the vertical direction is formed at the center of the board 112 . The through hole 112 a may serve as a discharge port configured to discharge refrigerant from a space surrounded by the plate 112 , the fixed wrap 114 and the orbiting scroll 12 .

The fixed scroll 11 configured as described above is fixed to the main frame 13 by a positioning mechanism such as a bolt or a positioning pin passing through a through hole formed in the protrusion 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 protruding from the orbiting scroll body to be formed by being engaged with the fixed wrap 114 of the fixed scroll 11 . Compression chamber 16. The orbiting wrap 122 may protrude upward from the orbiting scroll body.

The orbiting scroll 12 may perform an orbiting motion by being coupled to a rotary shaft 23 .

The orbiting scroll body may include a plate 121 having a disk shape and a cylindrical body portion 123 protruding downward from a lower end of the plate 121 . The winding roll 122 may protrude upward from the upper end of the plate 121 and have a spiral shape when viewed from the top.

The orbiting scroll 12 may be formed of FC material or FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may be engaged with the fixed wrap 114 of the fixed scroll 11 . In addition, the orbiting wrap 122 of the orbiting scroll 12 and the fixed wrap 114 of the fixed scroll 11 may be disposed in a space formed by the body portion 111 and the plate 112 and the plate 121 of the fixed scroll 11 to form Compression chamber 16. As the orbiting coil 122 moves circularly around the fixed fixed coil 114 , the volume of the compression chamber 16 is reduced and the refrigerant of the compression chamber 16 is compressed. In other words, since the inner space between the fixed wrap 114 and the orbiting wrap 122 is reduced toward the center of rotation, the refrigerant is compressed.

An eccentric shaft 232 of the rotating shaft 23 described later is inserted into the main body portion 123 through a sliding bearing. As mentioned above, the main body portion 123 serves as a bearing for the eccentric shaft 232 .

The main frame 13 is an example of a holding member configured to hold the fixed scroll 11 . The main frame 13 may include a cylindrical first body portion 131, a cylindrical second body portion 132 protruding downward from the radially inner side of the lower end of the first body portion 131, a diameter A cylindrical third body portion 133 protruding inward and a cylindrical fourth body portion 134 protruding upward and downward from an inner end of the third body portion 133 . The outer peripheral surface of the first main body portion 131 of the main frame 13 is fixed to a later-described center case 31 of the case 30 . Furthermore, the rotation shaft 23 of the drive motor 20 described later is inserted into the inside of the fourth main body portion 134 although a journal bearing is interposed therebetween. As described above, the main frame 13 also functions as a bearing that rotatably supports the rotary shaft 23 .

On an outer peripheral portion of the first main body portion 131, a protrusion 131a protruding upward from an upper end surface is installed. A female screw is formed in the protrusion 131a, and a bolt passing through a through hole formed in the protrusion 113 of the fixed scroll 11 is engaged with the female screw. Therefore, the fixed scroll 11 is fixed to the main frame 13 .

On an outer peripheral portion of the first body portion 131, a groove 131b elongated in a vertical direction may be provided. That is, in the first body part 131, a groove 131b extending in a vertical direction from the center to the lower part of the outer peripheral part may be formed. In the first body part 131 , a portion forming the groove 131 b may be spaced apart from the center case 31 .

The rotation shaft 23 is fitted in the inner periphery of the fourth body portion 134 with journal bearings interposed therebetween, so the fourth body portion 134 functions as a bearing that rotatably supports the rotation shaft 23 .

The main frame 13 may further include a fixed scroll support surface 11 a configured to support the fixed scroll 11 . A fixed scroll supporting surface 11a may be formed on the protrusion 131a.

The sub-frame 14 is an example of a support member for supporting the orbiting scroll 12 . A gap may be formed between the main frame 13 and the sub frame 14 such that the sub frame 14 is movable relative to the main frame 13 . In other words, the sub-frame 14 may be disposed within the main frame 13 to be spaced apart from the main frame 13 .

The sub-frame 14 may include a cylindrical first body part 141 and a cylindrical second body part 142 protruding downward from a lower end surface of the first body part 141 . Between the outer peripheral surface of the first body portion 141 of the sub-frame 14 and the inner peripheral surface of the first body portion 131 of the main frame 13 and between the inner peripheral surface of the second body portion 142 of the sub-frame 14 and the second body of the main frame 13 Between the outer peripheral surfaces of the four main body portions 134, the subframe 14 may be arranged in a space surrounded by the orbiting scroll 12 and the main frame 13 with a gap in which the subframe 14 is only in the axial direction of the rotating shaft 23. Directionally movable with respect to the main frame 13 .

Furthermore, in the portion formed by the fourth main body portion 134 of the main frame 13 and the first main body portion 141 of the sub frame 14 and the portion formed by the first main body portion 131 of the main frame 13 and the first main body portion 141 of the sub frame 14, A first groove 141 a and a second groove 141 b recessed downward from the upper end surface are formed. In the radial direction, a first groove 141a is formed in the central portion, and a second groove 141b is formed between the first groove 141a and the protrusion 131a. In addition, the main body portion 123 of the orbiting scroll 12 is inserted into the first groove 141a. In the second groove 141b, the Oldham ring 15 that prevents the orbiting scroll 12 from pivoting is disposed between the main frame 13 and the orbiting scroll 12.

Further, in the above-described compression portion 10 , a discharge passage for discharging the refrigerant compressed in the compression chamber 16 is formed. As for the discharge channel configured to discharge high-pressure refrigerant, one end thereof is connected to the through hole 112a of the plate 112 (the through hole 112a is configured to discharge high-pressure refrigerant from the space surrounded by the fixed scroll 11 and the orbiting scroll 12). refrigerant), the other end of which is connected to the space below the main frame 13 in the case 30 and is also connected to the chamber 121a. As for the discharge passage configured to discharge intermediate-pressure refrigerant, one end thereof is connected to a discharge port configured to discharge intermediate-pressure refrigerant from a space surrounded by the fixed scroll 11 and the orbiting scroll 12, Its other end is connected to chambers 121b and 142a.

Next, the drive motor 20 will be described.

The drive motor 20 is fixed to the housing 30 below the compression portion 10 . The driving motor 20 may include a stator 21 constituting a stator, a rotor 22 constituting a rotor, a rotation shaft 23 supporting the rotor 22 and rotating relative to the case 30 , and a support member 24 rotatably supporting the rotation shaft 23 .

The stator 21 may include a stator body 211 and a coil 212 wound around the stator body 211 . The stator main body 211 is a laminated body in which a plurality of electrical steel sheets are laminated, and has an approximately cylindrical shape. The diameter of the outer peripheral surface of the stator main body 211 is formed larger than the diameter of the inner peripheral surface of the center case 31 of the case 30 described later. The stator main body 211 (stator 21 ) is forcibly inserted into the center case 31 . A method of inserting the stator main body 211 into the center case 31 may employ a shrink fit or a press fit method.

In addition, the stator main body 211 has a plurality of teeth in the circumferential direction on an inner portion facing the outer circumference of the rotor 22 . The coil 212 is arranged in a slot formed between adjacent teeth. In the stator 21 according to an embodiment, concentrated winding in which the coil 212 is inserted into a slot positioned between a plurality of adjacent teeth will be described as an example of the coil 212 .

The rotor 22 is a laminated body in which a plurality of electrical steel sheets having a ring shape are laminated, and has an approximately cylindrical shape. The diameter of the inner peripheral surface of the rotor 22 is formed smaller than the diameter of the outer peripheral surface of the rotary shaft 23 . The rotor 22 is forcibly inserted into the rotating shaft 23 . A method for inserting the rotor 22 into the rotary shaft 23 may employ a press-fit method. The rotor 22 is fixed to the rotary shaft 23 and rotates together with the rotary shaft 23 . In addition, a rotor in which one permanent magnet is embedded is described as an example of the rotor 22 .

The diameter of the outer peripheral surface of the rotor 22 is smaller than the diameter of the inner peripheral surface of the stator main body 211 of the stator 21 , and a gap is formed between the rotor 22 and the stator 21 .

The rotary shaft 23 may include: a main shaft 231 to which the rotor 22 is fitted and coupled; and an eccentric shaft 232 provided on an upper portion of the main shaft 231 and having an axis eccentric from the axis of the main shaft 231 .

A lower portion of the main shaft 231 is rotatably supported by the supporting member 24 , and an upper portion of the main shaft 231 is rotatably supported by the main frame 13 of the compression part 10 . The eccentric shaft 232 is rotatably supported by the main body portion 123 of the orbiting scroll 12 .

The rotary shaft 23 is provided with a through hole 233 passing through the rotary shaft 23 in the axial direction. In the rotating shaft 23, the first communication hole 234 allowing the through hole 233 to communicate with the bearing of the support member 24, the second communication hole 235 allowing the through hole 233 to communicate with the bearing of the main frame 13, and the second communication hole 235 allowing the through hole 233 to communicate with the main body portion 123 The third communication hole 236 through which the bearing communicates is formed in the radial direction.

The support member 24 includes a cylindrical first body portion 241 and a cylindrical second body portion 242 protruding downward from a lower end of the first body portion 241 . The support member 24 is fixed to the center case 31 in such a manner that the outer peripheral surface of the first body portion 241 faces the inner peripheral surface of the center case 31 of the case 30 described later. Further, the rotating shaft 23 is inserted into the inside of the first body portion 241 and the second body portion 242 with a journal bearing interposed therebetween. As described above, the support member 24 functions as a bearing that rotatably supports the rotary shaft 23 .

Further, in the first body portion 241 , holes and grooves that allow a space higher than the first body portion 241 to communicate with a space lower than the first body portion 241 are formed.

A pump 243 that pumps lubricant is mounted to the lower end of the second body portion 242 of the support member 24 .

Next, the casing 30 will be described.

The housing 30 may include: a central housing 31 arranged at the center in the vertical direction and having a cylindrical shape; an upper housing 32 covering an upper opening of the central housing 31; and a lower housing 33 covering an opening of the central housing 31. Lower the opening. In addition, the case 30 may include a discharge part 34 that discharges the high-pressure refrigerant compressed by the compression part 10 to the outside of the case 30 , and a suction part 35 that sucks the refrigerant from the outside of the case 30 . .

As described above, the main frame 13 of the compression section 10 and the stator 21 and the supporting member 24 of the drive motor 20 are fixed to the center case 31 . A discharge portion 34 and a suction portion 35 are provided by inserting pipes into through holes formed in the center case 31 . The suction portion 35 is installed at a position corresponding to the through hole 111 a formed in the body portion 111 of the fixed scroll 11 . The suction portion 35 sucks refrigerant from the outside of the housing 30 into a space surrounded by the fixed scroll 11 and the orbiting scroll 12 .

The lower case 33 is formed in a bowl shape so that lubricant can be collected.

Next, the operation of the scroll compressor 1 will be described.

When the driving motor 20 of the scroll compressor 1 is driven, the rotary shaft 23 rotates, and the orbiting scroll 12 fitted in the eccentric shaft 232 of the rotary shaft 23 orbits around the fixed scroll 11 . As the orbiting scroll 12 orbits around the fixed scroll 11, low-pressure refrigerant is sucked from the outside of the casing 30 into a space surrounded by the fixed scroll 11 and the orbiting scroll 12 through the suction portion 35. The refrigerant is compressed according to the volume change of the compression chamber 16 . The high-pressure refrigerant in the compression chamber 16 is discharged to the lower side of the compression part 10 .

The high-pressure refrigerant discharged to the lower side of the compression part 10 is discharged to the outside of the case 30 through the discharge part 34 provided in the case 30 . In being discharged to the outside of the case 30 , the high-pressure refrigerant is distributed to the gap between the rotor 22 and the stator 21 and the gap between the stator 21 and the center case 31 . After each operation of condensation, expansion, and evaporation in the refrigerant circuit, the high-pressure refrigerant discharged to the outside of the case 30 is sucked into the suction part 35 again.

On the other hand, the lubricant stored in the lower case 33 of the case 30 is pumped up by the pump 243 and raised through the through hole 233 formed in the rotation shaft 23 . The raised lubricant is supplied to each bearing of the rotary shaft 23 through the first communication hole 234 , the second communication hole 235 , and the third communication hole 236 formed in the rotary shaft 23 , or to the sliding portion of the compression portion 10 . member. The lubricant supplied to the sliding member of the compression portion 10 or the lubricant supplied to the bearing of the rotary shaft 23 through the second communication hole 235 and the third communication hole 236 passes through the communication hole 131e and the groove 131b formed in the main frame 13 , the gap between the rotor 22 and the stator 21 and the axial hole formed in the support member 24 are returned to the lower case 33 , and then stored in the lower portion of the case 30 . During this process and while the high-pressure refrigerant is distributed into the gap between the rotor 22 and the stator 21 before being discharged to the outside of the housing 30, the lubricant and refrigerant flow into the low-pressure side while cooling the drive motor 20. The lubricant that has been dispensed with the high-pressure refrigerant is separated from the refrigerant and then stored in the lower portion of the case 30 .

As described above, in the scroll compressor 1 according to an embodiment, the sub-frame 14 supporting the orbiting scroll 12 is disposed in a space surrounded by the orbiting scroll 12 and the main frame 13 .

Since the conventional scroll compressor is not provided with the subframe 14, the moment load applied to the orbiting scroll 12 from the refrigerant sucked by the suction portion 35 is replaced by the upper thrust load and the orbiting scroll in the fixed scroll 11. Back pressure loads in scroll 12 cancel out. However, in the orbiting scroll 12 according to an embodiment, the moment load F _M applied to the orbiting scroll 12 from the refrigerant sucked by the suction portion 35 is counteracted by the upward thrust reaction force in the fixed scroll 11 . F _U and the lower surface thrust reaction force F _L in the subframe 14 cancel.

In this case, since the distance from the operating point of the upper surface thrust reaction force _FU to the operating point of the lower surface thrust reaction force _FL becomes longer, the lower surface thrust reaction force _FL is allowed to be smaller than that of the conventional scroll compressor rear surface load. In addition, the upper surface thrust reaction force F _U is allowed to be small. Therefore, the scroll compressor 1 according to an embodiment improves efficiency by reducing friction loss between the fixed scroll 11 and the orbiting scroll 12 , and by reducing the plate 121 of the orbiting scroll 12 . The load on the sliding part of the upper surface and the lower surface improves reliability.

Next, a modification of the scroll compressor 1 according to an embodiment will be described.

2 is an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

According to a modification of the scroll compressor 1 , the compression part 10 may include a fixed scroll 11 , an orbiting scroll 12 , a main frame 13 , a subframe 14 and an Oldham ring as shown in FIG. 1 . In addition, sealing members 123 c and 123 d configured to seal a gap between the fourth body portion 134 of the main frame 13 and the body portion 123 of the orbiting scroll 12 are provided in the body portion 123 of the orbiting scroll 12 . That is, the sealing members 123c and 123d may be provided between the main body portion 123 of the orbiting scroll 12 and the fourth main body portion 134 of the main frame 13. Referring to FIG. According to this modification, since the sealing members 123c and 123d are provided, it is possible to keep the inside of the chamber 121a at a high pressure. In addition, sealing members 141c and 141d as examples of first sealing members are provided in the first body portion 141 of the sub-frame 14 to seal between the first body portion 141 of the sub-frame 14 and the first body portion 131 of the main frame 13 gap (the first gap between the subframe 14 and the main frame 13), and at the same time, sealing members 142c and 142d as an example of a second sealing member are provided in the second main body portion 142 of the subframe 14 to seal the subframe. The gap between the second body portion 142 of the frame 14 and the fourth body portion 134 of the main frame 13 (the second gap between the sub frame 14 and the main frame 13 ). Therefore, according to a modification, by providing the sealing members 141c, 141d, 142c and 142d, the pressure of the chamber 142a can be maintained at a certain intermediate pressure.

Furthermore, according to a modification, sealing members 141c, 141d, 142c, and 142d configured to seal gaps between the sub-frame 14 and the main frame 13 are provided. However, it should be understood that a sealing member configured to seal a gap between the subframe 14 and at least one member facing the subframe 14 is provided.

3 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

With the compression portion 10 according to the modification of the scroll compressor 1 , the outer diameter of the subframe 14 is increased compared to the compression portion 10 according to the modification of the scroll compressor 1 shown in FIG. 2 . As the Oldham ring 15 moves radially inward, the position where the first body portion 141 of the sub-frame 14 supports the orbiting scroll 12 moves radially outward. According to a modification, since the distance from the operating point of the upper thrust reaction force to the operating point of the lower thrust reaction force becomes larger, the upper thrust reaction force and the lower thrust reaction force can be reduced.

4 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

With the compression portion 10 according to the modification of the scroll compressor 1, compared with the compression portion 10 according to the modification of the scroll compressor 1 shown in FIG. Four main body parts 134 . A rail can be described as an example of a guide member. Alternatively, wheels rolling on rails may be used and provided in the subframe 14 . According to a modification, since the guide members 134g and 134h are provided in the fourth body 134 of the main frame 13 , the sub-frame 14 may not be inclined and be movable only in the axial direction of the rotation shaft 23 .

5 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure.

With the compression portion 10 according to the modification of the scroll compressor 1, sealing members 141e and 141f configured to seal the gap between the first body portion 141 of the subframe 14 and the plate 121 of the orbiting scroll 12 are provided on the subframe. In the first body portion 141 of the frame 14, instead of the second body portion 142 configured to seal the sub-frame 14 and the first body portion 142 of the main frame 13 in the compression portion 10 of the scroll compressor 1 according to the modification shown in FIG. The gaps between the four body parts 134 are sealed by members 142c and 142d. According to a modification, since the sealing members 141c, 141d, 141e, and 141f are provided, by moving the refrigerant of the chamber 142a to the chamber 121b, the pressure inside the chamber 121b can be kept at the same pressure as the inside of the chamber 142a. Same specific intermediate pressure.

Furthermore, in a modification, seal members 141c and 141d configured to seal the gap between the subframe 14 and the main frame 13 and seal members 141e and 141e configured to seal the gap between the subframe 14 and the orbiting scroll 12 are provided. 141f. However, it should be understood that a sealing member configured to seal a gap between the subframe 14 and at least one member facing the subframe 14 is provided.

As described above, according to an embodiment, the subframe 14 configured to support the orbiting scroll 12 is provided in a space surrounded by the orbiting scroll 12 , the rotating shaft 23 and the main frame 13 so as to The rotary shaft 23 is movable in the axial direction. Therefore, regardless of the position, the pressure applied from the subframe 14 to the orbiting scroll 12 can be equalized, and the thrust load for stabilizing the orbiting scroll 12 can be reduced, thereby improving the performance of the scroll compressor 1. efficiency and reliability.

Furthermore, in one embodiment, the sub-frame 14 is configured to be movable only in a direction along the rotation axis 23 with respect to the main frame 13 . However, it does not mean that the sub-frame 14 does not move at all except with respect to the movement of the main frame 13 in the direction along the rotation axis 23 . In addition to movement in the direction of the rotation shaft 23, when rotation about an axis perpendicular to the rotation shaft 23 is not permitted among rotations around the rotation shaft 23, movement in a direction along an axis perpendicular to the rotation shaft 23 may be allowed. Movement on and rotation about an axis perpendicular to the axis of rotation 23, other motions or rotations. Furthermore, it should be understood that the sub-frame 14 may be movable in a direction along the rotation axis 23 with respect to the main frame 13 . In addition, the sub-frame 14 may be movable in one direction with respect to the main frame 13 .

FIG. 6 illustrates an axial sectional view of a scroll compressor according to an embodiment of the present disclosure.

The scroll compressor 2 is a compressor widely used in air conditioners, refrigerators, and heat pumps. Fig. 6 shows a longitudinal sectional view of a hermetic scroll compressor used in a refrigerant circuit of an air conditioner.

The scroll compressor 2 includes: a compression part 10 configured to compress refrigerant; a driving motor 20 configured to drive the compression part 10 ; and a housing 30 corresponding to a body configured to receive the compression part 10 and the driving motor 20 . According to an embodiment, the scroll compressor 2 is a vertical scroll compressor in which an axial direction of a rotating shaft 23 (to be described later) of a drive motor 20 coincides with a gravity direction. Hereinafter, the axial direction of the rotation shaft 23 will be referred to as "vertical direction", and based on FIG. 6 , the higher side may be referred to as "upper side" and the lower side may be referred to as "lower side". Although a vertical scroll compressor is described as an example, embodiments of the present disclosure will be applicable to a horizontal scroll compressor.

First, the compression section 10 will be described.

The compression part 10 may include: a fixed scroll 11 fixed to the housing 30; an orbiting scroll 12 orbiting by being engaged with the fixed scroll 11; a main frame 13 fixed to the housing 30 and configured to support the fixed scroll 11; the subframe 14 arranged between the rotary shaft 23 and the main frame 13 and configured to support the orbiting scroll 12; and the Oldham ring 15 configured to allow the orbiting scroll 12 to orbit move without pivoting the orbiting scroll 12.

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 protruding from the fixed scroll body. The fixed wrap 114 may protrude downwardly from the fixed scroll body.

The fixed scroll body may include: a cylindrical body portion 111; a plate 112 configured to cover an opening in an upper side of the body portion 111; and a protrusion 113 extending in a radially outward direction from a lower end of the body portion 111. . The fixed roll 114 may protrude downward from the lower end of the plate 112 and have a spiral shape when viewed from the bottom.

The fixed scroll 11 may be formed from cast iron, such as gray cast iron FC 250 .

The body part 111 may be provided with a through hole 111a in a radial direction. The through hole 111 a may serve as a suction port configured to suck refrigerant into a space surrounded by the main body portion 111 , the plate 112 and the orbiting scroll 12 .

A through hole 112 a in the vertical direction is formed at the center of the board 112 . The through hole 112 a may serve as a discharge port configured to discharge refrigerant from a space surrounded by the plate 112 , the fixed scroll 114 and the orbiting scroll 12 .

The fixed scroll 11 configured as described above is fixed to the main frame 13 by a positioning mechanism such as a bolt or a positioning pin passing through a through hole formed in the protrusion 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll main body and an orbiting wrap 122 protruding from the orbiting scroll main body to engage with the fixed wrap 114 of the fixed scroll 11 . A compression chamber 16 is formed. The orbiting wrap 122 may protrude upward from the orbiting scroll body.

The orbiting scroll body may include a plate 121 having a disk shape and a cylindrical body portion 123 protruding downward from a lower end of the plate 121 . The winding roll 122 may protrude upward from the upper end of the plate 121 and have a spiral shape when viewed from the top.

The orbiting scroll 12 may be formed of FC material or FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may be engaged with the fixed wrap 114 of the fixed scroll 11 . In addition, the orbiting wrap 122 of the orbiting scroll 12 and the fixed wrap 114 of the fixed scroll 11 may be placed in a space formed by the body portion 111 of the fixed scroll 11 and the plate 112 and the plate 121 to form Compression chamber 16. Since the orbiting coil 122 moves circularly around the fixed fixed coil 114 , the volume of the compression chamber 16 is reduced, and the refrigerant of the compression chamber 16 is compressed. In other words, when the inner space between the fixed wrap 114 and the orbiting wrap 122 is reduced toward the center of rotation, the refrigerant is compressed.

An eccentric shaft 232 of the rotating shaft 23 described later is inserted into the main body portion 123 through a sliding bearing. Accordingly, the main body portion 123 serves as a bearing for the eccentric shaft 232 .

The main frame 13 is an example of a holding member configured to hold the fixed scroll 11 . The main frame 13 may include a cylindrical first body portion 131 , a cylindrical second body portion 132 protruding downward from a radially inner side of a lower end of the first body portion 131 , and a diameter A cylindrical third body portion 133 protruding inward. In the third body part 133, a through hole 133a into which the rotation shaft 23 is inserted may be provided. The outer peripheral surface of the first main body portion 131 of the main frame 13 is fixed to a later-described center case 31 of the case 30 . According to an embodiment, the main frame 13 does not support a later-described rotating shaft 23 of the driving motor 20 .

On an outer peripheral portion of the first main body portion 131, a protrusion 131a protruding upward from an upper end surface is installed. A female screw is formed in the protrusion 131a, and a bolt passing through a through hole formed in the protrusion 113 of the fixed scroll 11 is engaged with the female screw. Therefore, the fixed scroll 11 is mounted to the main frame 13 .

On an outer peripheral portion of the first body portion 131, a groove 131b elongated in a vertical direction may be provided. That is, in the first body part 131, a groove 131b extending in a vertical direction from the center to the lower part of the outer peripheral part may be formed. In the first body part 131 , a portion forming the groove 131 b may be spaced apart from the center case 31 .

The main frame 13 may further include a fixed scroll support surface 11 a configured to support the fixed scroll 11 . A fixed scroll supporting surface 11a may be formed on the protrusion 131a.

The sub-frame 14 is an example of a support member for supporting the orbiting scroll 12 . A gap may be formed between the main frame 13 and the sub frame 14 to allow the sub frame 14 to be movable with respect to the main frame 13 . In other words, the sub-frame 14 may be disposed within the main frame 13 to be spaced apart from the main frame 13 .

The sub-frame 14 may include a cylindrical first body portion 141 , a cylindrical second body portion 142 protruding downward from a lower end surface of the first body portion 141 , and a cylindrical second body portion 142 protruding downward from an inner end surface of the second body portion 142 . A protruding cylindrical third body portion 143 . The third body part 143 may have a smaller width than the first body part 141 and the second body part 142 . Specifically, the width of the inner peripheral surface of the third body part 143 may be smaller than the width of the inner peripheral surface of the first body part 141 and the width of the inner peripheral surface of the second body part 142 . The third body part 143 may be inserted into the shaft through hole 133 a to be located between the rotation shaft 23 and the third body part 133 of the main frame 13 . Furthermore, a later-described rotary shaft 23 of the drive motor 20 is inserted into the inside of the third body portion 143 although journal bearings are interposed therebetween. Therefore, the sub-frame 14 functions as a bearing that rotatably supports the rotary shaft 23 . The sub-frame 14 may be configured to be movable with respect to the main frame 13 at least one of an axial direction of the rotation shaft 23 and a direction perpendicular to the axial direction of the rotation shaft 23 . On the other hand, between the outer peripheral surface of the first body portion 141 and the inner peripheral surface of the first body portion 131 of the main frame 13 and between the outer peripheral surface of the third body portion 143 and the third body portion 133 of the main frame 13 Between the inner peripheral surfaces of the inner peripheral surfaces, the sub-frame 14 may be arranged between the rotating shaft 23 and the main frame 13 with a gap that allows the sub-frame 14 to be movable in the axial direction of the rotating shaft 23 with respect to the main frame 13 and to move around the It is movable in a rotational direction substantially perpendicular to an imaginary axis of the rotational shaft 23 .

Furthermore, in the portion formed by the first body portion 131 of the main frame 13 and the third body portion 143 of the sub frame 14 and the portion formed by the first body portion 131 of the main frame 13 and the first body portion 141 of the sub frame 14, A first groove 141 a and a second groove 141 b recessed downward from the upper end surface are formed. In the radial direction, a first groove 141a is formed in the central portion, and a second groove 141b is formed between the first groove 141a and the protrusion 131a. In addition, the main body portion 123 of the orbiting scroll 12 is inserted into the first groove 141a. In the second groove 141b, the Oldham ring 15 that prevents the orbiting scroll 12 from pivoting is disposed between the main frame 13 and the orbiting scroll 12.

Further, in the above-described compression portion 10 , a discharge passage for discharging the refrigerant compressed in the compression chamber 16 is formed. As for the discharge channel configured to discharge high-pressure refrigerant, one end thereof is connected to the through hole 112a of the plate 112 (the through hole 112a is configured to discharge the high-pressure refrigerant from the fixed scroll 11 and the orbiting scroll 12 surrounding space discharge), the other end of which is connected to the space below the main frame 13 in the casing 30 and also connected to the chamber 121a. As for the discharge passage configured to discharge intermediate-pressure refrigerant, one end thereof is connected to a discharge port (the discharge port is configured to discharge refrigerant from a space having intermediate-pressure refrigerant and surrounded by the fixed scroll 11 and the orbiting scroll 12 discharge), the other end of which is connected to chambers 121b and 142a.

Since the drive motor 20 and the housing 30 are the same as those described previously, descriptions thereof will be omitted.

Since the operation of the scroll compressor 2 is also the same as the previously described operation, description thereof will be omitted.

On the other hand, in such a scroll compressor 2, the orbiting scroll 12 will incline due to the compression load of gas.

Fig. 7a is a perspective view showing the torque received by the orbiting scroll. As shown in FIG. 7 a , the orbiting scroll 12 receives a compressive load F _t from a direction perpendicular to the eccentric direction of the eccentric shaft 232 on a plane from the main shaft 231 of the rotary shaft 23 . Therefore, in the orbiting scroll 12, a clockwise moment M _S when viewed from the viewpoint A is generated.

Fig. 7b is a view showing a shape in which the orbiting scroll is to be inclined. Specifically, FIG. 7b is a view showing a situation where the orbiting scroll 12 is about to tilt when viewed from the viewpoint A of FIG. 7a. As shown in FIG. 7b, the orbiting scroll 12 receives the compression load Ft and generates a clockwise moment load, so that the orbiting scroll will be inclined.

In addition, the sub-frame 14 receives lateral loads from this shaft and thus attempts to move in the direction of the load.

8 shows an axial sectional view of the compression portion and the rotary shaft when the moment applied to the subframe is in the same direction as that applied to the orbiting scroll.

Assume that the position on the axis supporting the lateral load F _MJ is opposite to the orbiting scroll 12 with respect to the lateral load F _MJ , as shown in FIG. 8 . For example, assume that the reaction force R _MJ applied to the sub-frame 14 is generated at a position as shown in FIG. 8 when the protrusion 135 of the main frame 13 is in contact with the sub-frame 14 . Therefore, it is difficult to effectively suppress the inclination of the orbiting scroll 12 because the moment M _F applied to the sub-frame 14 and the moment M _S applied to the orbiting scroll 12 are generated in the clockwise direction.

Therefore, according to an embodiment, the inclination of the orbiting scroll 12 is suppressed by generating a moment in the sub-frame 14 in a direction opposite to that of the orbiting scroll 12 by a lateral load. This is an example in which the sub-frame 14 is allowed to be movable in a direction opposite to the moment generated in the orbiting scroll 12 among the rotation directions about the virtual axis substantially orthogonal to the rotation shaft 23 .

Fig. 9 shows an axial sectional view of the compression portion and the rotary shaft when the moment applied to the subframe is in a direction opposite to that applied to the orbiting scroll.

According to one embodiment, it is assumed that the position on the axis supporting the lateral load F _MJ is on the same side as the orbiting scroll 12 with respect to the lateral load F _MJ , as shown in FIG. 9 . For example, assume that a reaction force R _MJ applied to the sub-frame 14 is generated at a position as shown in FIG. 9 when the protrusion 136 formed in the inner peripheral surface of the main frame 13 comes into contact with the sub-frame 14 . Therefore, the inclination of the orbiting scroll 12 can be effectively suppressed because the moment M _F applied to the sub-frame 14 is generated in the counterclockwise direction. This is an example in which the reaction force of the holding member against the load received by the orbiting scroll is received at a predetermined position on the side of the orbiting scroll instead of a position in the rotary shaft that receives the load. The position where the reaction force R _MJ applied to the sub-frame 14 is generated may be between L1 and L2 as shown in FIG. 9 . L1 is the position of the tip surface of the third main body portion 143 of the sub-frame 14 on the side of the orbiting scroll 12 . When the end surface is inclined, it may be the lowest position of the end surface. L1 is an example of the position of the tip surface of the rotary shaft bearing of the support member on the side of the orbiting scroll. In addition, L2 is a position on which the surface of the orbiting wrap 122 of the plate 121 of the orbiting scroll 12 is formed. In other words, the plate 121 of the orbiting scroll 12 may include an orbiting wrap forming surface 121aa on which the orbiting wrap 122 is formed, and L2 is a position of the orbiting wrap forming surface 121aa. When the surface is sloped, it may be the uppermost position of the surface. L2 is an example of the position of the surface on which the plate of the orbiting scroll engages with the fixed scroll.

In addition, in order to generate the reaction force R _MJ applied to the sub-frame 14 at the position shown in FIG. The portion 141 may be in contact before the third body portion 133 of the main frame 13 and the third body portion 143 of the sub frame 14 are in contact. That is, when the sub-frame 14 is tilted due to movement, the protrusion 136 of the main frame 13 and the first main body portion 141 of the sub-frame 14 may contact the third main body portion 133 of the main frame 13 and the third main body portion 143 of the sub-frame 14 touch. More specifically, when the thrust surface of the subframe 14 supporting the orbiting scroll 12 is substantially parallel to the thrust surface of the fixed scroll 11, the first main body portion 131 of the main frame 13 and the first main body portion 141 of the subframe 14 The contact may be made before the third body part 133 of the main frame 13 and the third body part 143 of the sub frame 14 come into contact.

For this, the gap between the first body part 131 of the main frame 13 and the first body part 141 of the sub frame 14 is smaller than the gap between the third body part 133 of the main frame 13 and the third body part 143 of the sub frame 14. This is an example in which the minimum clearance with the retaining member on the same side as the orbiting scroll is smaller than the minimum clearance with the retaining member on the opposite side to the orbiting scroll with respect to the position receiving the load about the rotary shaft. The position of the gap between the first body part 131 of the main frame 13 and the first body part 141 of the sub frame 14 may be between L1 and L2, as shown in FIG. 9 . L1 is the position of the tip end surface of the third body portion 143 of the sub-frame 14 on the side of the orbiting scroll 12 . When the end surface is inclined, it may be the lowest position of the end surface. L1 is an example of the position of the tip end surface of the rotary shaft bearing of the support member on the orbiting scroll side. In addition, L2 is a position on which the surface of the orbiting wrap 122 of the plate 121 of the orbiting scroll 12 is formed. When the surface is sloped, it may be the uppermost position of the surface. L2 is an example of the position of the surface on which the plate of the orbiting scroll engages with the fixed scroll.

Furthermore, according to an embodiment, as shown in FIG. 9 , the sub-frame 14 may include a thrust bearing 144 having an orbiting scroll supporting surface 144 a supporting the orbiting scroll 12 . The thrust bearing 144 may have an elastically deformable shape. Specifically, the outer peripheral side of the thrust bearing 144 of the sub-frame 14 may be inclined so that when in contact with a surface of the orbiting scroll 12 on which the orbiting scroll 12 is not formed, the thrust bearing 144 of the sub-frame 14 may be Elastic deformation. In this way, thrust loads are distributed to suppress local contact. However, the shape of the thrust bearing 144 shown in FIG. 9 is not limited thereto, and thus the thrust bearing 144 may have various shapes as long as it is elastically deformable. The thrust bearing 144 is an example of a part of the supporting member for supporting the orbiting scroll, and the shape of the thrust bearing 144 of FIG. 9 is an example of a shape elastically deformed when in contact with a surface due to the inclination of the orbiting scroll, The plate of the orbiting scroll does not engage the fixed scroll on this surface.

Next, implementation of the Oldham ring 15 of the scroll compressor 2 according to an embodiment will be described.

10 shows an axial sectional view of a compression portion and a rotating shaft according to an implementation example of a scroll compressor.

The compression section 10 according to an implementation of the scroll compressor 2 may include a fixed scroll 11 , an orbiting scroll 12 , a main frame 13 , a subframe 14 and an Oldham ring 15 as shown in FIG. 1 . . In one implementation, the Oldham ring 15 is coupled to, or engaged with, the orbiting scroll 12 and the subframe 14 . Specifically, a pair (two pieces) of Oldham ring guide grooves 121 g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12 . A pair (two pieces) of key portions 15b formed on the upper surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 121g or with the Oldham ring guide groove 121g. join. In addition, a pair (two pieces) of Oldham ring guide grooves 141g having a phase difference of about 90° from the Oldham ring guide grooves 121g of the orbiting scroll 12 are formed in the first main body portion 141 of the sub-frame 14. The upper surface of is formed as a substantially straight line. A pair (two pieces) of key portions 15c formed on the lower surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 141g or with the Oldham ring guide groove 141g. join. With the Oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

Fig. 11 shows an axial sectional view of a compression portion and a rotating shaft according to an implementation of a scroll compressor.

The compression section 10 according to an implementation of the scroll compressor 2 may include a fixed scroll 11 , an orbiting scroll 12 , a main frame 13 , a subframe 14 and an Oldham ring 15 as shown in FIG. 1 . . In one implementation, the Oldham ring 15 is coupled to, or engaged with, the orbiting scroll 12 and the subframe 14 . Specifically, a pair (two pieces) of Oldham ring guide grooves 121 g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12 . A pair (two pieces) of key portions 15b formed on the upper surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 121g or with the Oldham ring guide groove 121g. join. In addition, a pair (two pieces) of Oldham ring guide grooves 131g having a phase difference of about 90° from the Oldham ring guide grooves 121g of the orbiting scroll 12 are formed in the first main body portion 131 of the main frame 13. The upper surface of is formed as a substantially straight line. A pair (two pieces) of key portions 15d formed on the lower surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 131g or with the Oldham ring guide groove 131g. join. With the Oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

Fig. 12 shows an axial sectional view of a compression portion and a rotating shaft according to an implementation of a scroll compressor.

The compression section 10 according to an implementation of the scroll compressor 2 may include a fixed scroll 11 , an orbiting scroll 12 , a main frame 13 , a subframe 14 and an Oldham ring 15 as shown in FIG. 1 . . In one implementation, the Oldham ring 15 is coupled to or engaged with the orbiting scroll 12 and the fixed scroll 11 . Specifically, a pair (two pieces) of Oldham ring guide grooves 121 g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12 . A pair (two pieces) of key portions 15b formed on the upper surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 121g or with the Oldham ring guide groove 121g. join. In addition, a pair (two pieces) of Oldham ring guide grooves 112g having a phase difference of about 90° from the Oldham ring guide grooves 121g of the orbiting scroll 12 are formed in the plate 112 of the fixed scroll 11. A substantially straight line is formed on the lower surface. A pair (two pieces) of key portions 15e formed on the upper surface of the ring portion 15a of the Oldham ring 15 can be slidably coupled to the Oldham ring guide groove 112g or with the Oldham ring guide groove 112g. join. With the Oldham ring 15 configured as described above, the orbiting scroll 12 can perform an orbiting motion without pivoting.

However, in a configuration in which the sub-frame 14 supporting the orbiting scroll 12 is movable only in the direction along the rotation shaft 23, it is difficult to control the moment applied to the sub-frame 14, thus simply following the trend. Therefore, it is difficult to effectively select the position of the downward thrust reaction force, so the effect is not obtained. According to one embodiment, the position of the downthrust reaction can be efficiently chosen so as to maximize the effect.

In some embodiments, the space surrounded by the main frame 13 and the sub-frame 14 is formed by two sealing members between the main frame 13 and the sub-frame 14 . By introducing a certain pressure (intermediate pressure) from the compression chamber 16 during the compression operation in this space, the sub-frame 14 can be pushed against the orbiting scroll 12 . As for its implementation, mainly two methods can be used and will be described in detail with some variants.

13 illustrates an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure. In other words, FIG. 13 shows an axial sectional view of the compression portion 10 and the rotary shaft 23 according to a modification of the scroll compressor 2 .

The compression part 10 according to a modification of the scroll compressor 2 may include a fixed scroll 11 , an orbiting scroll 12 , a main frame 13 and a sub frame 14 as shown in FIG. 6 . The orbiting scroll 12 orbits by being engaged with the fixed scroll 11 to form a compression chamber 16 . The compression chamber 16 sucks and compresses low-pressure refrigerant as indicated by arrows in the through-hole 111a in the radial direction, and discharges high-pressure refrigerant as indicated by the arrow in the through-hole 112a in the vertical direction. A description of the Oldham ring 15 will be omitted.

In the compression portion 10, a sealing member 171a configured to seal a gap between the main body portion 123 of the orbiting scroll 12 and the third main body portion 143 of the sub-frame 14 is provided. According to a modification, by providing the sealing member 171a, the chamber 171 is formed and maintained at high pressure.

In addition, sealing members 172 a and 172 b configured to seal a gap between the main frame 13 and the sub-frame 14 may be provided in the compression part 10 to form a cavity 172 between the main frame 13 and the sub-frame 14 . A sealing member 172a configured to seal a gap between the second body portion 132 of the main frame 13 and the first body portion 141 of the sub-frame 14 is provided, and at the same time, a third body portion 133 configured to seal the main frame 13 and the sub-frame 14 is provided. The gap between the third main body portion 143 is sealed by the sealing member 172b. These sealing members 172a and 172b correspond to the above-mentioned two sealing members. According to a variant, the chamber 172 is formed by providing sealing members 172a and 172b.

Also, in the compression part 10 , refrigerant passages 181 , 182 , and 183 configured to guide refrigerant discharged from the compression chamber 16 to the chamber 172 may be provided. Specifically, in the compression part 10, a first passage 181, a second passage 182, and a third passage 183 configured to guide refrigerant at a certain pressure from the compression chamber 16 to the chamber 172 are provided. A first passage 181 may be provided in the orbiting scroll 12 to communicate with the compression chamber 16 . The first passage 181 is a passage passing through the inside of the orbiting scroll 12, and is an example of an inner passage of the orbiting scroll. The first passage 181 moves refrigerant out of the compression chamber 16 and introduces refrigerant into the second passage 182 . A second passage 182 may be provided in the fixed scroll 11 to connect the first passage 181 to the third passage 183 . The second passage 182 is a passage passing through the fixed scroll 11 and is an example of an internal passage of the fixed scroll. The second passage 182 moves the refrigerant introduced from the first passage 181 and introduces the refrigerant into the third passage 183 . A third passage 183 may be provided in the main frame 13 to communicate with the chamber 172 . The third passage 183 is a passage passing through the main frame 13, and is an example of an internal passage of the holding member. The third passage 183 moves the refrigerant introduced from the second passage 182 and introduces the refrigerant into the chamber 172 . Therefore, the pressure in the chamber 172 is maintained at a certain intermediate pressure.

14 is a plan view illustrating an end portion of a plate of an orbiting scroll in a compression portion when viewed from the top according to a modification of the scroll compressor according to an embodiment of the present disclosure. In other words, FIG. 14 shows a plan view of the end portion of the plate 121 of the orbiting scroll 12 when viewed from the top.

Among the upper regions of the plate 121, the inlet 181a of the first passage 181 is provided in the region 125a facing the compression chamber 16 (the region on the right side of the dotted arc), and the outlet 181b of the first passage 181 is provided in the In the region 125b (the region to the left of the dashed arc) that the body portion 111 of the rotary member 11 contacts. The first channel 181 is not actually visible when viewing the plate 121 from the top, but is shown in dashed lines in the figures for clarity. In addition, the inlet 181a of the first passage 181 is shown to be arranged in a region in two orbiting rolls 122 that are fitted outermost and adjacent to each other, but the location of the inlet 181a is not limited thereto. Therefore, the location of the inlet 181 a may be selected according to the magnitude of the intermediate pressure to be introduced into the chamber 172 . Accordingly, the desired intermediate-pressure refrigerant in the compression chamber 16 flows to the first passage 181 .

15 is a bottom view illustrating a main body portion of a fixed scroll in a compression portion when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure. In other words, FIG. 15 shows a bottom view of the main body portion 111 of the fixed scroll 11 when viewed from the bottom.

In the lower region of the main body portion 111, the inlet 182a of the second passage 182 is provided in the region 115a (the region on the right side of the dotted arc) in contact with the plate 121 of the orbiting scroll 12, and the inlet 182a of the second passage 182 The outlet 182b is provided in the region 115b (the region on the left side of the dotted line arc) in contact with the main frame 13 . When viewing the main body portion 111 of the fixed scroll 11 from the bottom, the second passage 182 is not actually visible, but is shown in dashed lines in the drawings for clarity. Furthermore, in a modification, the inlet 182a of the second passage 182 is provided in a point on the locus 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits. Accordingly, a certain range of intermediate-pressure refrigerant in the compression chamber 16 facing the inlet 181 a flows from the first passage 181 to the second passage 182 .

16 shows an axial sectional view of a compression portion and a rotary shaft of a modification of a scroll compressor according to an embodiment of the present disclosure. In other words, FIG. 16 shows an axial sectional view of the compression portion 10 and the rotary shaft 23 according to a modification of the scroll compressor 2 .

Compared with the compression portion 10 according to the modification of the scroll compressor 2 shown in FIG. 13 , the compression portion 10 according to the modification of the scroll compressor 2 may further include The counter bore (counter bore) 184 between.

Since the top view of the end portion of the plate 121 of the orbiting scroll 12 when viewed from the top has been described previously, description thereof will be omitted.

17 is a bottom view illustrating a main body portion of a fixed scroll in a compression portion when viewed from the bottom according to a modification of the scroll compressor according to an embodiment of the present disclosure.

In the lower region of the main body portion 111, the inlet 182a of the second passage 182 is provided in the region 115a (the region on the right side of the dotted arc) in contact with the plate 121 of the orbiting scroll 12, and the inlet 182a of the second passage 182 The outlet 182b is provided in the region 115b (the region on the left side of the dotted line arc) in contact with the main frame 13 . When viewing the main body portion 111 of the fixed scroll 11 from the bottom, the second passage 182 is not actually visible, but is shown in dashed lines in the drawings for clarity. Furthermore, in a modification, the inlet 182a of the second passage 182 is provided to be in contact with a counterbore 184 corresponding to the trajectory 181c covering the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits. Example of a full groove section. Accordingly, the intermediate-pressure refrigerant in the compression chamber 16 facing the inlet 181a flows from the first passage 181 to the second passage 182.

According to a variant, the inlet 182a of the second passage 182 is provided in contact with a counterbore 184 covering the entirety of the trajectory 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits, but not limited to this. Alternatively, the inlet 182a of the second passage 182 is provided in contact with a counterbore 184 covering a part of the trajectory 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits. That is, the inlet 182a of the second passage 182 may communicate with the outlet 181b of the first passage 181 during at least a part of a period in which the orbiting scroll 12 orbits.

Furthermore, according to some modifications, it is assumed that the first passage 181 configured to move refrigerant out of the compression chamber 16 and introduce the refrigerant into the second passage 182 in the fixed scroll 11 is provided in the orbiting scroll 12, and The second passage 182 configured to introduce refrigerant introduced from the first passage 181 in the orbiting scroll 12 to the third passage 183 in the main frame 13 is provided in the fixed scroll 11 , but is not limited thereto. Alternatively, it may be assumed that a passage configured to move refrigerant out of the compression chamber 16 and directly introduce the refrigerant into the third passage 183 of the main frame 13 is provided in the fixed scroll 11 . By using the above configuration, the control of communication timing between the first channel 181 and the second channel 182 mentioned in some modifications may not be required.

In addition, according to some modifications, assuming that the main frame 13 and the sub-frame 14 have shapes as shown in FIGS. A chamber 172 is formed between the subframe 14 and configured to introduce intermediate pressure from the compression chamber 16 into the chamber 172 , but is not limited thereto. For example, assuming that the main frame 13 and the sub-frame 14 have shapes as shown in FIG. It is configured to introduce intermediate pressure from the compression chamber 16 into the chamber.

Alternatively, when the chamber 142a of FIGS. 2 to 4 corresponds to the chamber 172 of FIGS. Introduced into chamber 172. In addition, when it is assumed that the space formed by the chamber 142a and the chamber 121b of FIG. 5 corresponds to the chamber 172 of FIGS. 13 to 16 , intermediate pressure may be introduced from the compression chamber 16 to the chamber 172 .

In this sense, it should be understood that the intermediate pressure is introduced from the compression chamber 16 into The chamber 172 may include introducing intermediate pressure from the compression chamber 16 into the chamber 172 by forming an inner space at least between the main frame 13 and the sub-frame 14 and by sealing at least a gap between the main frame 13 and the sub-frame 14 using a sealing mechanism. .

Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to those skilled in the art. The present disclosure is intended to cover such changes and modifications as come within the scope of the appended claims.

Claims (11)

1. A scroll compressor, comprising: main body; a fixed scroll fixed to the interior of the main body and provided with a fixed wrap; an orbiting scroll configured to orbit with respect to the fixed scroll and provided with an orbiting wrap forming a compression chamber together with the fixed wrap; a main frame configured to support the fixed scroll; a subframe disposed within the main frame to support the orbiting scroll at a position away from the center of the orbiting scroll, a sealing member configured to seal a gap between the main frame and the sub-frame to form a chamber between the main frame and the sub-frame, a channel configured to direct refrigerant discharged from the compression chamber to the chamber, Wherein said channels include: a first passage provided in the orbiting scroll to communicate with the compression chamber; a second passage provided in the main frame to communicate with the chamber; and a third passage provided in the fixed scroll to connect the first passage to the second passage, and wherein a gap is formed between the main frame and the sub-frame to allow the sub-frame to be movable with respect to the main frame. 2. The scroll compressor of claim 1, wherein: The outlet of the first passage forms a trajectory according to the orbiting motion of the orbiting scroll, and The entrance of the third channel is arranged on the track. 3. The scroll compressor of claim 1, further comprising: a rotary shaft to which the orbiting scroll is coupled and along which the orbiting scroll orbits, Wherein the sub-frame is configured to be movable with respect to the main frame in at least one of a first direction extending along the rotation axis or a second direction orthogonal to the first direction. 4. The scroll compressor of claim 1, further comprising: a rotary shaft inserted into a shaft through hole formed in the main frame and coupled to the orbiting scroll to allow the orbiting scroll to orbit, Wherein the main frame includes a first body portion and a second body portion, the first body portion includes a fixed scroll support surface configured to support the fixed scroll, and the second body portion is positioned on the first body portion. a body portion below and including said shaft through hole, Wherein the sub-frame includes a first main body portion arranged in the first main body portion of the main frame and inserted into the shaft through hole to be arranged between the rotation shaft and the main body of the main frame. a second body portion between the second body portions, and wherein a gap is formed between the first body portion of the main frame and the first body portion of the sub-frame, and a gap is formed between the second body portion of the main frame and the sub-frame between the second body portion. 5. The scroll compressor according to claim 4, wherein said gap between said first body portion of said main frame and said first body portion of said subframe is smaller than that between said The gap between the second body portion of the main frame and the second body portion of the subframe. 6. The scroll compressor of claim 4, wherein the subframe is configured to be movable with respect to the main frame, wherein the subframe further includes a thrust bearing positioned above the first body portion of the subframe and including an orbiting scroll support surface configured to support the orbiting scroll, and Wherein the thrust bearing has an elastically deformable shape. 7. The scroll compressor of claim 4, wherein the subframe is configured to be movable with respect to the main frame, and A protrusion configured to be in contact with the first body portion of the sub-frame is formed on an inner surface of the first body portion of the main frame. 8. The scroll compressor according to claim 7, wherein when the sub-frame tilts while moving with respect to the main frame, there is a gap between the second main body portion of the main frame and the sub-frame The protrusion of the main frame is in contact with the first body portion of the sub-frame before the second body portion is in contact. 9. The scroll compressor of claim 1, further comprising: an Oldham ring configured to prevent pivoting of the orbiting scroll, Wherein the Oldham ring is coupled to the orbiting scroll and the subframe. 10. The scroll compressor of claim 1, further comprising: an Oldham ring configured to prevent pivoting of the orbiting scroll, Wherein the Oldham ring is coupled to the orbiting scroll and the main frame. 11. The scroll compressor of claim 1, further comprising: an Oldham ring configured to prevent pivoting of the orbiting scroll, Wherein the Oldham ring is coupled to the orbiting scroll and the fixed scroll.

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