WO2011027567A1 - スクロール圧縮機 - Google Patents
スクロール圧縮機 Download PDFInfo
- Publication number
- WO2011027567A1 WO2011027567A1 PCT/JP2010/005421 JP2010005421W WO2011027567A1 WO 2011027567 A1 WO2011027567 A1 WO 2011027567A1 JP 2010005421 W JP2010005421 W JP 2010005421W WO 2011027567 A1 WO2011027567 A1 WO 2011027567A1
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- WO
- WIPO (PCT)
- Prior art keywords
- compression chamber
- back pressure
- chamber
- communicates
- compression
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0253—Details concerning the base
- F04C18/0261—Details of the ports, e.g. location, number, geometry
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/005—Axial sealings for working fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
Definitions
- the present invention relates to a scroll compressor having a mechanism for pressing a movable scroll against a fixed scroll.
- scroll compressors are known as compressors for compressing fluid.
- the fixed scroll and the movable scroll are engaged with each other, so that a compression chamber is formed between the fixed scroll and the movable scroll.
- the volume of the compression chamber gradually decreases. The fluid is compressed in the process of reducing the volume of the compression chamber.
- Patent Document 1 discloses a scroll compressor having a mechanism for pressing a movable scroll against a fixed scroll.
- a back pressure hole is formed in the end plate of the movable scroll, and a back pressure chamber is formed so as to face the back surface of the end plate of the movable scroll.
- the back pressure hole opens in the compression chamber in the process of compressing the fluid.
- An intermediate pressure fluid is introduced into the back pressure chamber.
- the ratio of the compression chamber volume (discharge volume) at the time when the discharge port changes to the state in which the discharge port communicates to the compression chamber volume (push-out volume) when the scroll port is closed from the suction port is constant.
- the discharge port communicates in the case of high differential pressure operating conditions in which the difference between the suction side fluid pressure and the discharge side fluid pressure (hereinafter referred to as “discharge pressure”) is large. Insufficient compression occurs in which the internal pressure of the immediately preceding compression chamber is lower than the discharge pressure. When the compression shortage occurs, after the discharge port communicates, the fluid flows backward from the outside of the discharge port to the compression chamber, and the internal pressure of the compression chamber rapidly increases to become the discharge pressure.
- the peak value of the internal pressure of the compression chamber communicates with the back pressure chamber when the compression is insufficient.
- the difference with the internal pressure of the compression chamber increases. Therefore, since the difference between the peak value of the internal pressure of the compression chamber acting as the separation force and the internal pressure of the back pressure chamber acting as the pressing force increases, the pressing force may be insufficient with respect to the separation force.
- the internal pressure of the compression chamber immediately before the discharge port communicates becomes the discharge pressure in the low differential pressure operating condition where the difference between the suction side fluid pressure and the discharge side fluid pressure is small. Overcompression that is higher than that occurs. If overcompression occurs, after the discharge port communicates, the internal pressure of the compression chamber rapidly decreases to a discharge pressure.
- the present invention has been made in view of the above points, and an object of the present invention is to provide a scroll compressor having a pressing mechanism that presses a movable scroll against a fixed scroll. It is to avoid the shortage.
- a fixed scroll (60) having a discharge port (64) and a movable scroll (23) meshed with the fixed scroll (60) and forming a compression chamber (23) together with the fixed scroll (60). 70), and a scroll compressor that drives the movable scroll (70) to compress the fluid in the compression chamber (23).
- the pressing mechanism (75) that presses the movable scroll (70) against the fixed scroll (60) and the fluid in the back pressure introduction passage (80) flows from the compression chamber (23) to the back pressure chamber (53).
- a backflow prevention mechanism (35) for preventing the return from the back pressure chamber (53) to the compression chamber (23).
- the compression chamber in which the back pressure introduction passage (80) of the pressing mechanism (75) is in a state immediately before the discharge port (64) communicates with the discharge port (64) is in communication. Communicate with (23). For this reason, as the movable scroll (70) rotates, the back pressure introduction passage (80) communicates with the compression chamber (23) immediately before the discharge port (64) communicates with the discharge port (64). The state in which the back pressure introduction passage (80) communicates with the compression chamber (23) in turn appears alternately.
- the internal pressure of the compression chamber (23) immediately before the discharge port (64) communicates becomes higher than the discharge pressure, while the discharge port (64)
- the internal pressure of the compression chamber (23) in a state in which is communicated becomes the discharge pressure. That is, the internal pressure of the compression chamber (23) immediately before the discharge port (64) communicates is higher than the internal pressure of the compression chamber (23) in a state where the discharge port (64) communicates.
- the back pressure introduction passage (80) alternately communicates with the compression chamber (23) with a high internal pressure and the compression chamber (23) with a low internal pressure.
- the internal pressure of the compression chamber (23) immediately before the discharge port (64) communicates is lower than the discharge pressure, while the discharge port (64)
- the internal pressure of the compression chamber (23) in communication is the discharge pressure. That is, the internal pressure of the compression chamber (23) in a state where the discharge port (64) communicates is higher than the internal pressure of the compression chamber (23) immediately before the discharge port (64) communicates.
- the back pressure introduction passage (80) is divided into a compression chamber (23) with a high internal pressure and a compression chamber (23 with a low internal pressure) as the movable scroll (70) rotates. ) And alternately communicate with each other.
- the backflow prevention mechanism (35) prevents the fluid from returning from the back pressure chamber (53) to the compression chamber (23). Therefore, when the back pressure introduction passage (80) communicates with the compression chamber (23) having a high internal pressure, fluid is introduced from the compression chamber (23) to the back pressure chamber (53), and the back pressure introduction passage ( When 80 is in communication with the compression chamber (23) having a low internal pressure, the backflow prevention mechanism (35) prevents the fluid in the back pressure chamber (53) from returning to the compression chamber (23). When the back pressure introduction passage (80) communicates with the compression chamber (23) having a low internal pressure, the fluid in the back pressure chamber (53) returns to the compression chamber (23). The internal pressure will not decrease. The internal pressure of the back pressure chamber (53) is adjusted so as to approach the compression chamber (23) in a state where the internal pressure is high.
- the internal pressure of the back pressure chamber (53) is adjusted so as to approach the internal pressure of the compression chamber (23) immediately before the discharge port (64) communicates.
- the internal pressure of the back pressure chamber (53) is adjusted so as to approach the internal pressure of the compression chamber (23) in a state where the discharge port (64) communicates.
- the back pressure chamber is arranged so as to approach the maximum pressure in the pressure change of the fluid in the compression chamber (23) regardless of whether overcompression occurs or undercompression occurs.
- the internal pressure of (53) is adjusted.
- the internal pressure of the back pressure chamber (53) is maintained at a pressure close to or equal to the maximum pressure in the fluid pressure change in the compression chamber (23).
- the casing (10) that houses the fixed scroll (60) and the movable scroll (70) communicates with the compression chamber (23) in the process of sucking fluid. While the suction side space (24) is formed, when the difference between the internal pressure of the back pressure chamber (53) and the pressure of the suction side space (24) exceeds a predetermined differential pressure reference value, the back pressure chamber ( 53) is provided with a back pressure reducing mechanism (26) for communicating the suction side space (24) with the suction side space (24).
- the back pressure reducing mechanism (26) causes the back pressure chamber when the internal pressure of the back pressure chamber (53) is higher than the pressure in the suction side space (24) by a predetermined differential pressure reference value or more. Allow fluid to flow from (53) to suction side space (24). That is, when the internal pressure in the back pressure chamber (53) is higher than the pressure in the suction side space (24) by a predetermined differential pressure reference value or more, the back pressure reduction mechanism (26) reduces the internal pressure in the back pressure chamber (53). Reduce.
- a relief port (67) for releasing the fluid in the compression process from 23) is formed to communicate with the compression chamber (23) after the back pressure introduction passage (80).
- the compression chamber (23) with which the back pressure introduction passage (80) communicates immediately before the discharge port (64) communicates (hereinafter referred to as “compression target compression chamber (23)”).
- a relief port (67) is provided.
- the relief port (67) allows the internal pressure of the compression chamber (23) to be communicated by allowing fluid to flow out from the compression chamber (23) to be communicated when overcompression occurs in the compression chamber (23) to be communicated. Reduce.
- the relief port (67) communicates after the back pressure introduction passage (80) communicates. Therefore, the fluid is introduced from the compression chamber (23) to be communicated before the pressure is reduced by the relief port (67) into the back pressure chamber (53).
- the compression chamber (23) includes an inner surface of the fixed side wrap (62) of the fixed scroll (60) and the movable scroll (70).
- the movable scroll (70) and the fixed scroll (60) are configured such that the compression ratio of the first compression chamber (23a) and the compression ratio of the second compression chamber (23b) are different from each other.
- the back pressure introduction passage (80) is provided in the compression chamber (23a) only in the compression chamber (23a) having the larger compression ratio of the first compression chamber (23a) and the second compression chamber (23b). It communicates immediately before the discharge port (64) communicates.
- the movable scroll (70) and the fixed scroll (60) are different from each other in the length of the movable wrap (72) and the length of the fixed wrap (62), for example.
- the compression ratio of the compression chamber (23a) and the compression ratio of the second compression chamber (23b) are configured to be different from each other.
- the back pressure introduction passage (80) is provided just before the discharge port (64) communicates with only the compression chamber (23a) having the larger compression ratio of the first compression chamber (23a) and the second compression chamber (23b). Communicate. For this reason, when overcompression occurs, the internal pressure of the back pressure chamber (53) is adjusted to the higher one of the maximum pressure of the first compression chamber (23a) and the maximum pressure of the second compression chamber (23b).
- the compression chamber (23) includes an inner surface of a fixed wrap (62) of the fixed scroll (60) and the movable scroll (70).
- 2 compression chambers (23b) Between the outer side surface of the movable side wrap (72) and the outer side surface of the fixed side wrap (62) and the inner side surface of the movable side wrap (72). 2 compression chambers (23b).
- the back pressure introduction passage (80) communicates with the first inlet (91) communicating with the first compression chamber (23a) immediately before the discharge port (64) communicates with the discharge port (64).
- the back pressure introduction passage (80) includes the first inlet (91) and the second inlet (92).
- the first inlet (91) communicates with the first compression chamber (23a) immediately before the discharge port (64) communicates.
- the second inlet (92) communicates with the second compression chamber (23b) immediately before the discharge port (64) communicates.
- the back pressure chamber (53) is connected to both the first compression chamber (23a) just before the discharge port (64) communicates and the second compression chamber (23b) just before the discharge port (64) communicates. Communicate.
- the back pressure introduction passage (80) is formed in the movable scroll (70).
- the backflow prevention mechanism (35) includes a valve member (36) that moves in a predetermined first direction when switching from a state of preventing fluid flow in the back pressure introduction passage (80) to an allowable state. Yes.
- the angle formed by the first direction and the second direction which is the direction of a straight line from the axial center of the main shaft portion (41) to the axial center of the eccentric portion (42), is the rotational direction of the drive shaft (40). Is positive and is 90 ° or less and ⁇ 90 ° or more.
- the discharge port (64) changes from a state in which the discharge port (64) does not communicate with the compression chamber (23) to be communicated to which the back pressure introduction passage (80) communicates, that is, overcompression occurs.
- the angle between the first direction and the second direction is ⁇ 90 when the rotational direction of the drive shaft (40) is positive. It is more than 90 degrees and less than °. Therefore, at the time point, the magnitude of the first direction component of the centrifugal force acting on the valve member (36) becomes zero or more.
- the angle between the first direction and the second direction is 0 ° or more and 90 ° or less when the rotational direction of the drive shaft (40) is positive. It has become.
- the angle formed between the first direction and the second direction is such that the drive shaft (40) When the rotation direction is positive, the angle is 0 ° or more and 90 ° or less.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) is maximized when the angle between the first direction and the second direction becomes 0 °.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) is maximized before the time point.
- the back pressure introduction passage (80) communicates with the compression chamber (23) that reaches the maximum pressure in the fluid pressure change, regardless of whether overcompression occurs or undercompression occurs. Since the backflow prevention mechanism (35) prevents the internal pressure of the back pressure chamber (53) from decreasing, the back pressure chamber (35) is brought to a pressure close to or equal to the maximum pressure in the fluid pressure change in the compression chamber (23). 53) The internal pressure is maintained. The separation force becomes maximum when the maximum pressure is reached in the fluid pressure change. In the present invention, in any case, the internal pressure of the back pressure chamber (53) is adjusted in accordance with the maximum separation force. Therefore, under any operating condition, it is possible to avoid that the pressing force is insufficient with respect to the separating force. And it can avoid that a fluid leaks from a compression chamber (23) and compression efficiency falls because a movable scroll (70) inclines by lack of pressing force.
- the back pressure reducing mechanism (26) Reduce the internal pressure of the chamber (53).
- the internal pressure of the back pressure chamber (53) is either the case where overcompression occurs or the case where compression is insufficient. 23) maintained at or near the same pressure. That is, the difference between the internal pressure of the back pressure chamber (53) and the internal pressure of the compression chamber (23) at which the maximum pressure is reached does not change so much between over-compression and under-compression.
- the back pressure chamber (53) when the internal pressure of the back pressure chamber (53) is higher than the pressure of the suction side space (24) by a predetermined differential pressure reference value or more, the back pressure is reduced.
- the mechanism (26) reduces the internal pressure of the back pressure chamber (53). Therefore, when the compression is insufficient, the difference between the internal pressure of the back pressure chamber (53) and the internal pressure of the compression chamber (23) in the process of sucking fluid can be reduced. Therefore, it is possible to prevent the thrust loss from becoming excessive when the compression is insufficient.
- the relief port (67) communicates with the compression chamber (23) to be communicated after the back pressure introduction passage (80), so that the pressure before the pressure is reduced by the relief port (67).
- a fluid is introduced from the compression chamber (23) to be communicated into the back pressure chamber (53). For this reason, when overcompression occurs, it is possible to reduce the degree of overcompression while introducing a high-pressure fluid into the back pressure chamber (53) to ensure a pressing force.
- the back pressure chamber (53) when overcompression occurs, the back pressure chamber (53) is adjusted to the higher one of the highest pressure in the first compression chamber (23a) and the highest pressure in the second compression chamber (23b). ) Internal pressure is adjusted. For this reason, since a big pressing force is obtained, it can be avoided reliably that the pressing force is insufficient with respect to the separation force.
- the back pressure chamber (53) is provided with the second compression chamber (23a) immediately before the discharge port (64) communicates with the first compression chamber (23a) immediately before the discharge port (64) communicates. 23b) and communicate with both. For this reason, compared with the case where the back pressure chamber (53) communicates with only one of the first compression chamber (23a) and the second compression chamber (23b), the compression chamber (23 immediately before the discharge port (64) communicates with the compression chamber (23). ) And the back pressure chamber (53) communicates with each other for a long time.
- the fluid in the compression chamber (23) immediately before the discharge port (64) communicates is easily introduced into the back pressure chamber (53), so that the internal pressure of the back pressure chamber (53) is further increased.
- the voltage can be boosted stably and reliably.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) when the internal pressure of the compression chamber (23) to be communicated reaches the maximum pressure when overcompression occurs. Is set to zero or more.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) at the time point becomes a negative value, the force acting on the valve member (36) from the compression chamber (23) side. If the difference between the force acting on the valve member (36) from the back pressure chamber (53) side is not larger than the magnitude of the component in the direction opposite to the first direction of the centrifugal force, the valve member (36) Does not move to a position that allows fluid flow.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) is maximized when the internal pressure of the communication target compression chamber (23) reaches the maximum pressure.
- the valve member (36) is in fluid flow after that time point. There is a risk of not quickly returning to the position where the distribution is blocked. Therefore, when overcompression occurs, the back pressure chamber (53) may communicate with the compression chamber (23) to which the discharge port (64) communicates to reduce the pressure, and the back pressure may increase. The pressure in the chamber (53) may decrease.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) is maximized before the above time point.
- the valve member (36) can easily return to the position where the flow of the fluid is prevented. Therefore, when overcompression occurs, it is possible to avoid an increase in the time during which the back pressure chamber (53) communicates with the compression chamber (23) to which the discharge port (64) communicates to reduce the pressure. Since it can do, it can control that the pressure of a back pressure room (53) falls.
- FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment.
- FIG. 2 is a cross-sectional view of the compression mechanism according to the embodiment.
- Drawing 3 is a longitudinal section of the important section of the scroll compressor concerning an embodiment.
- FIG. 4 is a cross-sectional view showing the operation of the compression mechanism according to the embodiment.
- FIG. 5 is a cross-sectional view of the movable side end plate portion according to the embodiment, and FIG. 5 (A) is a cross-sectional view when the angle formed by the first direction and the second direction is 0 °, and FIG. B) is a cross-sectional view when the angle between the first direction and the second direction is a value close to 90.
- FIG. 6 is a chart showing changes in pressure in the compression chamber according to the embodiment.
- FIG. 7 is a longitudinal cross-sectional view of a main part of the scroll compressor according to the first modification of the embodiment.
- FIG. 8 is a longitudinal sectional view of a main part of the scroll compressor according to the second modification of the embodiment.
- FIG. 9 is a cross-sectional view illustrating the operation of the compression mechanism according to the second modification of the embodiment.
- This embodiment is a scroll compressor (1) according to the present invention.
- the scroll compressor (1) of the present embodiment is connected to, for example, a refrigerant circuit of an air conditioner that performs a cooling operation and a heating operation, and boosts the low-pressure refrigerant evaporated by the evaporator to the high-pressure of the refrigeration cycle.
- the high-low differential pressure which is the difference between the high pressure of the refrigeration cycle and the low pressure of the refrigeration cycle, changes according to the temperature of the outdoor air where the refrigerant performs heat exchange in the outdoor heat exchanger, and accordingly,
- the difference between the refrigerant pressure to be sucked and the refrigerant pressure to be discharged changes.
- the scroll compressor (1) of the present embodiment is provided with a vertically long and sealed casing-like casing (10). Inside the casing (10), an electric motor (30) and a compression mechanism (20) are arranged from bottom to top. Further, a drive shaft (40) extending vertically is provided inside the casing (10).
- the casing (10) includes a body portion (11) formed in a vertically long cylindrical shape, an upper end plate (12) which is airtightly joined to the upper end of the body portion (11) by welding, and a body portion (11 ) And a lower end plate (13) joined airtightly by welding.
- a housing (50) that divides the space of the casing (10) vertically is press-fitted and fixed to the body (11) of the casing (10).
- the casing (10) is provided with a suction pipe (14) that penetrates the body (11) and a discharge pipe (15) that penetrates the upper end plate (12).
- the lower end of the internal space of the casing (10) is a low-pressure oil reservoir (16) that stores lubricating oil.
- the lubricating oil stored in the low-pressure oil reservoir (16) is subjected to suction pressure that is the pressure of the suction refrigerant sucked into the casing (10).
- the housing (50) has a substantially disc shape, and a central portion is depressed, and a through hole (51) is formed in the central portion.
- the through hole (51) is provided with an upper bearing portion (17) that rotatably supports the drive shaft (40). Further, a lower bearing portion (18) that rotatably supports the drive shaft (40) is provided at the lower portion of the casing (10).
- the electric motor (30) is constituted by a so-called brushless DC motor, and is disposed below the housing (50).
- the electric motor (30) includes a stator (31) and a rotor (32).
- the stator (31) has a stator core and a coil attached to the stator core, and is formed in a substantially cylindrical shape.
- the stator (31) is fixed to the body (11) of the casing (10).
- the stator (31) is electrically connected to a power supply terminal (not shown) attached to the body (11).
- the rotor (32) has a rotor core and a permanent magnet embedded in the rotor core.
- the rotor (32) is connected to the main shaft portion (41) of the drive shaft (40) and is disposed inside the stator (31). When the electric motor (30) is operated, the rotor (32) is rotated, and the drive shaft (40) is also rotated accordingly.
- the drive shaft (40) includes a main shaft portion (41) and an eccentric portion (42).
- the main shaft part (41) is a substantially cylindrical member, and is supported rotatably around its axis (X) by the upper bearing part (17) and the lower bearing part (18) in the casing (10). Has been.
- the upper end portion of the main shaft portion (41) has a slightly larger diameter.
- the eccentric portion (42) is formed in a columnar shape having a smaller diameter than the main shaft portion (41), and is erected on the upper end surface of the main shaft portion (41).
- the axis of the eccentric part (42) is eccentric with respect to the axis (X) of the main shaft part (41).
- the drive shaft (40) is provided with a counterweight (43) provided on the main shaft portion (41) and an oil supply pump (44) provided on the lower end of the main shaft portion (41).
- the counterweight (43) is in the vicinity of the eccentric portion (42) and is eccentric to the opposite side of the eccentric portion (42) with respect to the axial center (X) of the main shaft portion (41). Is provided.
- the counterweight (43) is provided for dynamic balance with the movable scroll (70), the eccentric part (42) and the like.
- the oil pump (44) is immersed in the low pressure oil reservoir (16) at the bottom of the casing (10), and the lubricating oil stored in the low pressure oil reservoir (16) is used to rotate the drive shaft (40). It is configured to pump up with it.
- an oil supply passage (not shown) extending along the axis is formed on the drive shaft (40).
- This oil supply passage branches into sliding portions such as a portion supported by the upper and lower bearing portions (17, 18) and an eccentric portion (42) of the main shaft portion (41). That is, the lubricating oil pumped up by the oil supply pump (44) is supplied to each sliding portion through the oil supply passage.
- the compression mechanism (20) is disposed above the housing (50). As shown in FIGS. 1 and 2, the compression mechanism (20) includes a fixed scroll (60) and a movable scroll (70).
- the fixed scroll (60) includes a substantially disc-shaped fixed side end plate portion (61), a spiral fixed side wrap (62), and an outer edge portion (63) formed outside the fixed side wrap (62). And.
- the fixed side wrap (62) is erected on the front surface (lower surface in FIG. 1) of the fixed side end plate portion (61).
- the fixed scroll (60) is fastened and fixed to the housing (50) with bolts.
- the upper outer peripheral surface of the outer edge portion (63) is in close contact with the inner peripheral surface of the upper end plate (12).
- the inside of the casing (10) has an upper high-pressure space (22) filled with refrigerant discharged from the compression mechanism (20) and a lower low-pressure space (21 filled with refrigerant sucked by the compression mechanism (20). ).
- a discharge pipe (15) is opened in the high pressure space (22), and a suction pipe (14) is opened in the low pressure space (21).
- the movable scroll (70) includes a substantially disc-shaped movable side end plate portion (71), a spiral movable side wrap (72), and a cylindrical boss portion (73).
- the movable scroll (70) is placed on the upper surface of the housing (50) via the Oldham coupling (52).
- the Oldham coupling (52) prevents the movable scroll (70) during the eccentric rotational movement from rotating.
- the movable side wrap (72) is erected on the front surface (upper surface in FIG. 1) of the movable side end plate portion (71).
- the movable wrap (72) is meshed with the fixed wrap (62).
- the scroll compressor (1) of the present embodiment has an asymmetric spiral structure in which the movable side wrap (72) and the fixed side wrap (62) are formed asymmetrically.
- the number of turns of the fixed side wrap (62) (the length of the spiral) is larger than the number of turns of the movable side wrap (72) by the number of turns of about a half circumference. Note that the number of turns of the fixed-side wrap (62) is counted as if the spiral of the fixed-side wrap (62) extends to a position outside the suction port (25) described later.
- the boss portion (73) is erected on the back surface (lower surface in FIG. 1) of the movable side end plate portion (71).
- the eccentric part (42) of the drive shaft (40) is inserted into the boss part (73).
- a plurality of compression chambers (23) are formed between the fixed side wrap (62) and the movable side wrap (72).
- the plurality of compression chambers (23) include a first compression chamber (23a) between the inner surface of the fixed side wrap (62) and the outer surface of the movable side wrap (72), and the outer surface and the movable side of the fixed side wrap (62). It is comprised from the 2nd compression chamber (23b) between the inner surfaces of a lap
- the compression mechanism (20) is configured such that the compression ratio of the first compression chamber (23a) is larger than the compression ratio of the second compression chamber (23b).
- the refrigerant flows into the first compression chamber (23a) from the outside of the outer end of the movable wrap (72), and the refrigerant enters the second compression chamber (23b) from the inside of the outer end of the movable wrap (72). Flows in.
- a suction port (25) is formed in the fixed scroll (60) of the compression mechanism (20).
- the suction port (25) is formed in the outer edge portion (63) so as to open near the outermost peripheral portion of the fixed side wrap (62).
- the suction port (25) communicates with the low pressure space (21) through a communication port (not shown).
- the suction port (25) intermittently communicates with each of the first compression chamber (23a) and the second compression chamber (23b) with the eccentric rotational movement of the movable scroll (70).
- a discharge port (64) is formed in the fixed scroll (60).
- the discharge port (64) is configured by a through hole formed in the center of the fixed side end plate portion (61).
- the inlet of the discharge port (64) intermittently communicates with each of the first compression chamber (23a) and the second compression chamber (23b) with the eccentric rotational movement of the movable scroll (70).
- the outlet of the discharge port (64) opens into the discharge chamber (65) on the upper side of the fixed scroll (60).
- the fixed side end plate portion (61) is provided with a relief port (67) for allowing the refrigerant in the compression process to escape from the first compression chamber (23a).
- the relief port (67) has one end opened to the first compression chamber (23a) during the compression stroke and the other end opened to the high-pressure space (22).
- a relief valve (68) for opening and closing the relief port (67) is provided on the fixed side end plate portion (61).
- the relief valve (68) includes a reed valve and a valve presser.
- the relief port (67) is formed so as to communicate with the first compression chamber (23a) after a back pressure introduction hole (80) described later.
- a pressing mechanism (75) for pressing the movable scroll (70) against the fixed scroll (60) is provided.
- the pressing mechanism (75) includes a back pressure chamber (53) facing the back surface of the movable side end plate portion (71) and a back pressure introduction for introducing the refrigerant in the first compression chamber (23a) into the back pressure chamber (53). And a passage (80).
- the pressing mechanism (75) is configured to press the movable scroll (70) against the fixed scroll (60) by the refrigerant introduced into the back pressure chamber (53) through the back pressure introduction passage (80).
- the back pressure chamber (53) includes an inner seal ring (56) and an outer seal ring disposed in an annular groove (55) formed on the upper surface of the housing (50). (57).
- the outer seal ring (57) has a larger diameter than the inner seal ring (56).
- the height of the inner seal ring (56) and the outer seal ring (57) is set to a value larger than the depth of the groove (55).
- the inner seal ring (56) and the outer seal ring (57) are sandwiched between the back surface of the movable side end plate portion (71) and the bottom surface of the groove portion (55).
- the back pressure chamber (53) is divided on the inner side by an inner seal ring (56), on the outer side by an outer seal ring (57), on the upper side by the back surface of the movable end plate part (71), and on the lower side by a groove part. It is demarcated by the bottom of (55).
- the back pressure chamber (53) is an annular space.
- the back pressure introduction passage (80) is constituted by one back pressure introduction hole (80) extending from the front surface to the back surface of the movable side end plate portion (71).
- the back pressure introducing hole (80) has a circular cross section over its entire length.
- the back pressure introducing hole (80) includes an inlet portion (81), an intermediate portion (82), and an outlet portion (83).
- the inlet portion (81) extends downward (in the thickness direction of the movable side end plate portion (71)) from the front surface of the movable side end plate portion (71).
- the intermediate part (82) extends straight outward from the lower end of the inlet part (81).
- the outlet part (83) extends straight downward from the outer end of the intermediate part (82).
- the intermediate portion (82) includes a small diameter region (82a) and a large diameter region (82b).
- the inlet of the back pressure introduction hole (80) is opened in the vicinity of the inner peripheral side end of the spiral in the movable wrap (72). As shown in FIG. 4 (B), the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) immediately before the discharge port (64) communicates, as shown in FIG. 4 (C). Thus, the position is determined so as to communicate with the first compression chamber (23a) in a state where the discharge port (64) is communicated. That is, the inlet of the back pressure introduction hole (80) is overcompressed so that the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) communicates is higher than the discharge pressure that is the pressure of the high pressure space (22).
- the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) communicates with the first compression chamber (23a) in the overcompressed state in which the internal pressure is higher than the discharge pressure.
- the internal pressure communicates with the first compression chamber (23a) in a state where the pressure is increased to the discharge pressure.
- the refrigerant in the back pressure introduction hole (80) is allowed to flow from the first compression chamber (23a) to the back pressure chamber (53), and from the back pressure chamber (53) to the first compression chamber.
- a reverse flow prevention mechanism (35) for preventing the refrigerant from returning to (23a) is provided.
- the backflow prevention mechanism (35) is constituted by a check valve and is provided in the back pressure introduction hole (80).
- the backflow prevention mechanism (35) includes a ball-shaped valve member (36) and an elastic member (37) configured by an elastic spring.
- the valve member (36) is provided in the large diameter region (82b) of the intermediate portion (82) of the back pressure introduction hole (80).
- the diameter of the valve member (36) is smaller than the diameter of the large diameter region (82b).
- the valve member (36) is pressed against the valve seat (38) on the wall surface on the inlet side of the large diameter region (82b) by the elastic member (37).
- the backflow prevention mechanism (35) causes the valve member (36) to Apart from (38), the refrigerant enters an open state allowing the refrigerant to flow from the first compression chamber (23a) to the back pressure chamber (53).
- the backflow prevention mechanism (35) is configured such that the valve member (36) is moved by the elastic member (37) to the valve seat ( 38) is pressed against the back pressure chamber (53) to enter the first compression chamber (23a) so that the refrigerant does not flow into the closed state.
- the end of the compression stroke in the first compression chamber (23a) (from the state where the discharge port (64) does not communicate with the first compression chamber (23a) is communicated.
- the direction in which the valve member (36) moves when it is switched from the closed state to the open state when viewed from the axial direction of the drive shaft (40) at the time of change to the state (hereinafter referred to as "first direction”).
- first direction the direction in which the valve member (36) moves when it is switched from the closed state to the open state when viewed from the axial direction of the drive shaft (40) at the time of change to the state
- second direction the direction of the straight line (hereinafter referred to as “second direction”) from the axis (A) of the main shaft portion (41) to the axis (B) of the eccentric portion (42).
- a pressure introducing hole (80) is formed. That is, at the end of the compression stroke in the first compression chamber (23a), the angle between the first direction and the second direction is 0 ° when viewed from the
- the extending direction of the intermediate portion (82) of the back pressure introduction hole (80) coincides with the eccentric direction of the movable scroll (70).
- the inlet portion (81) is located on the inner side and the outlet portion (83) side is located on the outer side.
- the direction of the centrifugal force acting on the valve member (36) coincides with the first direction. That is, when overcompression occurs, the direction of the centrifugal force acting on the valve member (36) coincides with the first direction when the internal pressure of the first compression chamber (23a) reaches the maximum pressure.
- the angle ( ⁇ ) formed between the first direction and the second direction may be ⁇ 90 ° or more and 90 ° or less when the rotation direction of the drive shaft (40) is positive. That is, when the crank angle of the drive shaft (40) at the end of the compression stroke in the first compression chamber (23a) is ⁇ (°), the crank angle is a predetermined angle of ⁇ 90 ° or more and ⁇ + 90 ° or less. In addition, it is only necessary that the first direction and the second direction coincide with each other when viewed from the axial direction of the drive shaft (40).
- the angle ( ⁇ ) between the first direction and the second direction when viewed from the axial direction of the drive shaft (40) is the drive shaft (40 ) In the positive direction, it is more preferably 0 ° or more and 90 ° or less. If it becomes like this, the magnitude
- the valve member (36 ) Of the centrifugal force acting on the first direction component is relatively small.
- the magnitude of the first direction component is in the process of decreasing from the peak value. For this reason, immediately after the end of the compression stroke in the first compression chamber (23a), the magnitude of the first direction component becomes a negative value. Therefore, the valve member (36) can easily return to a position where the valve member (36) comes into contact with the valve seat (38) after the end of the compression stroke in the first compression chamber (23a).
- FIG. 4 shows a change in the position of the movable scroll (70) accompanying the rotation of the drive shaft (40).
- the position of the movable scroll (70) changes in the order of (A), (B), (C), (D).
- the suction stroke in which the refrigerant in the low pressure space (21) is sucked through the suction port (25).
- the refrigerant is sucked into the compression chambers (23a, 23b) during the suction stroke as the volume thereof increases.
- the intake port (25) when the intake port (25) is completely closed, the intake stroke is finished, and the compression stroke for compressing the refrigerant is started.
- the compression chamber (23a, 23b) during the compression stroke moves to the center while decreasing its volume as the movable scroll (70) rotates. At that time, the refrigerant in the compression chambers (23a, 23b) is compressed. In the compression chamber (23a, 23b), the compression stroke is performed until the compression chamber (23a, 23b) communicates with the discharge port (64). When the discharge port (64) communicates with the compression chambers (23a, 23b), a discharge stroke for discharging the refrigerant through the discharge port (64) is started. The refrigerant discharged from the compression chambers (23a, 23b) during the discharge stroke is discharged from the discharge pipe (15).
- the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) in the latter half of the compression stroke.
- the inlet of the back pressure introduction hole (80) is provided in the first compression chamber (23a) while the movable scroll (70) moves from the position shown in FIG. 4 (A) to the position shown in FIG. 4 (B). Communicate with.
- the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) immediately before the discharge port (64) communicates.
- the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) prior to the relief port (67).
- the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) during the discharge stroke.
- the inlet of the back pressure introduction hole (80) is provided in the first compression chamber (23a) while the movable scroll (70) moves from the position shown in FIG. 4C to the position shown in FIG. 4D. Communicate with.
- the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) in a state where the discharge port (64) communicates.
- the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) communicates is higher than the discharge pressure.
- the internal pressure of the first compression chamber (23a) in a state where the discharge port (64) communicates becomes the discharge pressure. That is, the internal pressure in the first compression chamber (23a) immediately before the discharge port (64) communicates is higher than the internal pressure in the first compression chamber (23a) in the state in which the discharge port (64) communicates.
- the inlet of the back pressure introduction hole (80) is connected to the first compression chamber (23a) having a high internal pressure and the first compression chamber (23a) having a low internal pressure. Communicate alternately.
- FIG. 6 the change in the internal pressure of the first compression chamber (23a) when neither overcompression nor undercompression occurs is shown by a solid line, and the first compression chamber (23a) when overcompression occurs.
- the change in the internal pressure is indicated by a one-dot chain line, and the change in the internal pressure of the first compression chamber (23a) when insufficient compression occurs is indicated by a broken line.
- the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) communicates becomes lower than the discharge pressure
- the discharge port (64 ) Communicate with each other, the internal pressure of the first compression chamber (23a) becomes the discharge pressure. That is, the internal pressure of the first compression chamber (23a) in a state where the discharge port (64) is in communication is higher than the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) is in communication.
- the back pressure introduction hole (80) has an inlet in which the internal pressure is high and the first compression chamber (23a) in which the internal pressure is high as the movable scroll (70) rotates. It communicates alternately with the first compression chamber (23a).
- the backflow prevention mechanism (35) prevents the refrigerant from returning from the back pressure chamber (53) to the first compression chamber (23a). Accordingly, when the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) in a state where the internal pressure is high, the backflow prevention mechanism (35) is opened, and the first compression chamber (23a) ) Is introduced into the back pressure chamber (53). Further, when the inlet of the back pressure introduction hole (80) communicates with the first compression chamber (23a) in a state where the internal pressure is low, the backflow prevention mechanism (35) is closed and the back pressure chamber (53) The refrigerant is prevented from returning to the first compression chamber (23a).
- the backflow prevention mechanism (35) when the back pressure introduction passage (80) communicates with the first compression chamber (23a) in a state where the internal pressure is low, the refrigerant in the back pressure chamber (53) is transferred to the first compression chamber. It is avoided to some extent that the internal pressure of the back pressure chamber (53) decreases due to the return to (23a). The internal pressure of the back pressure chamber (53) is adjusted so as to approach the first compression chamber (23a) in a state where the internal pressure is high.
- the internal pressure of the back pressure chamber (53) is adjusted so as to approach the internal pressure of the first compression chamber (23a) immediately before the discharge port (64) communicates.
- the internal pressure of the back pressure chamber (53) is adjusted so as to approach the internal pressure of the first compression chamber (23a) in a state where the discharge port (64) communicates.
- the back pressure chamber in order to approach the maximum pressure in the refrigerant pressure change in the first compression chamber (23a), regardless of whether overcompression occurs or undercompression occurs. 53)
- the internal pressure is adjusted.
- the internal pressure of the back pressure chamber (53) is maintained at a pressure approximately equal to the maximum pressure in the refrigerant pressure change in the first compression chamber (23a).
- the back pressure introduction passage (80) is provided in the first compression chamber (23a) that has the highest pressure in the refrigerant pressure change, regardless of whether overcompression occurs or undercompression occurs.
- the internal pressure of the back pressure chamber (53) is maintained.
- the separating force becomes maximum when the maximum pressure is reached in the change in the pressure of the refrigerant.
- the internal pressure of the back pressure chamber (53) is adjusted in accordance with the maximum separation force.
- the relief port (67) communicates with the first compression chamber (23a) after the back pressure introduction passage (80), the first compression before the pressure is reduced by the relief port (67).
- the refrigerant is introduced from the chamber (23a) into the back pressure chamber (53). For this reason, when overcompression occurs, it is possible to reduce the degree of overcompression while introducing a high-pressure refrigerant into the back pressure chamber (53) to ensure a pressing force.
- the back pressure introduction passage (80) is discharged only to the first compression chamber (23a) having the larger compression ratio between the first compression chamber (23a) and the second compression chamber (23b). Communicate immediately before port (64) communicates. For this reason, when overcompression occurs, the internal pressure of the back pressure chamber (53) is adjusted to the higher one of the maximum pressure of the first compression chamber (23a) and the maximum pressure of the second compression chamber (23b). The Therefore, since a large pressing force can be obtained, it is possible to reliably avoid a lack of the pressing force with respect to the separation force.
- the magnitude of the first direction component of the centrifugal force acting on the valve member (36) when the internal pressure of the first compression chamber (23a) reaches the maximum pressure is It is set to zero or more. For this reason, even if the difference between the internal pressure of the first compression chamber (23a) and the internal pressure of the back pressure chamber (53) is small, the valve member (36) moves to a position that allows the refrigerant to flow. Therefore, the internal pressure of the back pressure chamber (53) can be increased to a higher pressure.
- size of the 1st direction component of the centrifugal force which acts on a valve member (36) becomes the maximum before the time of the internal pressure of a 1st compression chamber (23a) becoming the maximum pressure. It is trying to become. For this reason, after the said time, it becomes easy to return to the position where a valve member (36) prevents the distribution
- the scroll compressor (1) includes a back pressure reduction mechanism (26).
- the back pressure reducing mechanism (26) is constituted by a check valve.
- the housing (50) includes a storage chamber (27) that houses the back pressure reduction mechanism (26), and an inlet-side passage (28) that connects the back pressure chamber (53) and the storage chamber (27). And an outlet side passage (29) for communicating the shaft side space (24) between the inner surface of the storage chamber (27) and the housing (50) and the outer surface of the drive shaft (40).
- the shaft side space (24) communicates with the low pressure space (21). For this reason, the shaft side space (24) communicates with the compression chamber (23) during the suction stroke via the suction port (25). The internal pressure of the shaft side space (24) becomes equal to the internal pressure of the compression chamber (23) during the suction stroke.
- the shaft side space (24) constitutes the suction side space (24).
- the accommodation chamber (27) is a space with a circular cross section extending in the vertical direction.
- the inlet side passage (28) has one end opened at the bottom surface of the groove (55) and the other end opened at the upper end of the accommodation chamber (27).
- the entrance-side passage (28) has a smaller-diameter cross section than the accommodation chamber (27).
- a valve seat for a reduction valve member (46), which will be described later, is formed around the opening of the inlet side passage (28) on the upper wall surface of the storage chamber (27).
- the outlet side passage (29) has one end opened on the wall surface of the storage chamber (27) and the other end opened on the inner wall surface of the housing (50).
- the back pressure reduction mechanism (26) includes a substantially ball-shaped reduction valve member (46) and a reduction elastic member (47) constituted by an elastic spring.
- the reduction valve member (46) is pressed against the valve seat on the upper wall surface of the storage chamber (27) by the reduction elastic member (47).
- the back pressure reducing mechanism (26) when the internal pressure of the back pressure chamber (53) exceeds the internal pressure of the axial space (24), that is, the internal pressure of the back pressure chamber (53) is reduced to the compression chamber (23 When the internal pressure exceeds (), the reducing valve member (46) contracts, and the reducing valve member (46) moves away from the valve seat and moves downward. The reduction valve member (46) moves downward as the difference between the internal pressure of the back pressure chamber (53) and the internal pressure of the compression chamber (23) during the suction stroke increases. When the difference between the internal pressure of the back pressure chamber (53) and the internal pressure of the compression chamber (23) during the suction stroke becomes equal to or greater than a predetermined differential pressure reference value, the reducing valve member (46) is connected to the outlet side passage (29).
- the back pressure chamber (53) communicates with the shaft side space (24), and the back pressure reduction mechanism (26) is opened.
- the back pressure chamber (53) communicates with the shaft side space (24)
- the refrigerant in the back pressure chamber (53) flows out into the shaft side space (24), and the internal pressure of the back pressure chamber (53) decreases.
- the differential pressure reference value is set so that the back pressure reduction mechanism (26) is not opened when overcompression occurs, and the back pressure reduction mechanism (26) is opened only when compression is insufficient. Is set. Specifically, the differential pressure reference value is set to be smaller than the assumed value of the differential pressure between the internal pressure of the compression chamber (23) during the suction stroke and the internal pressure of the compression chamber (23) at the end of the compression stroke. Has been.
- the estimated value of the internal pressure of the compression chamber (23) during the suction stroke can be obtained from, for example, the estimated evaporation temperature of the evaporator in the refrigerant circuit, and the estimated value of the internal pressure of the compression chamber (23) at the end of the compression stroke is It can be obtained by multiplying the assumed value of the internal pressure of the compression chamber (23) during the suction process by the compression ratio of the compression mechanism (20).
- the internal pressure of the back pressure chamber (53) is reduced by the back pressure reducing mechanism (26), thereby reducing the internal pressure of the back pressure chamber (53) and the compression chamber (in the suction process).
- the difference from the internal pressure of 23) can be reduced. That is, the difference between the pressing force and the separation force can be reduced. Therefore, it is possible to prevent the thrust loss from becoming excessive when the compression is insufficient.
- the back pressure introduction passage (80) is connected to the first inlet (91) that communicates with the first compression chamber (23a) immediately before the discharge port (64) communicates.
- the passage extending from the first inlet (91) and the passage extending from the second inlet (92) merge on the compression chamber (23) side with respect to the backflow prevention mechanism (35). Yes.
- the back pressure chamber (53) includes a first compression chamber (23a) immediately before the discharge port (64) communicates with a second compression chamber (23b) just before the discharge port (64) communicates. To communicate with both. For this reason, compared with the case where the back pressure chamber (53) communicates with only one of the first compression chamber (23a) and the second compression chamber (23b), the compression chamber (23 immediately before the discharge port (64) communicates with the compression chamber (23). ) And the back pressure chamber (53) communicates with each other for a long time. Therefore, when overcompression occurs, the refrigerant in the compression chamber (23) immediately before the discharge port (64) communicates is easily introduced into the back pressure chamber (53), so that the internal pressure of the back pressure chamber (53) is further increased. The voltage can be boosted stably and reliably.
- the back pressure introduction passage (80) has a first back pressure introduction hole (80a) having a first inlet (91) communicating with the first compression chamber (23a) immediately before the discharge port (64) communicates; You may comprise by the 2nd back pressure introduction hole (80b) which has the 2nd inlet_port
- the outlets of the back pressure introduction holes (80a, 80b) communicate with the back pressure chamber (53), respectively.
- Each back pressure introduction hole (80a, 80b) is provided with a backflow prevention mechanism (35a, 35b).
- the pressing force of the valve member (36) by the elastic member (37) is smaller than that in the other backflow prevention mechanism (35a, 35b), so that the compression chamber (23a, 23b) The refrigerant can be introduced evenly.
- a symmetrical spiral structure in which the movable side wrap (72) and the fixed side wrap (62) are formed symmetrically may be used.
- the inlet of the back pressure introduction passage (80) is continuously compressed between the immediately before the discharge port (64) communicates and immediately after the discharge port (64) communicates.
- the position may be determined so as to communicate with 23).
- the present invention is useful for a scroll compressor having a mechanism for pressing a movable scroll against a fixed scroll.
- Scroll compressor 20 Compression mechanism 23a First compression chamber 23b Second compression chamber 35 Backflow prevention mechanism 36 Valve member 37 Elastic spring 38 Valve seat 40 Drive shaft 53 Back pressure chamber 60 Fixed scroll 61 Fixed side end plate 62 Fixed side wrap 64 Discharge port 70 Movable scroll 71 Movable end plate 72 Movable wrap 75 Pressing mechanism 80 Back pressure introduction passage
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Abstract
Description
次に、上述したスクロール圧縮機 (10)の運転動作について説明する。
本実施形態では、過圧縮が生じる場合であっても、圧縮不足が生じる場合であっても、冷媒の圧力変化において最高圧力になる第1圧縮室(23a)に背圧導入通路(80)が連通すると共に、背圧室(53)の内圧が減少することが逆流阻止機構(35)によって阻止されるので、第1圧縮室(23a)での冷媒の圧力変化における最高圧力に近い又は等しい圧力に背圧室(53)の内圧が保持される。離反力は、冷媒の圧力変化において最高圧力になるときに最大になる。本実施形態では、何れの場合においても、背圧室(53)の内圧が、離反力が最大になるときに合わせて調節されている。従って、如何なる運転条件であっても、離反力に対して押付力が不足することを回避することができる。そして、押付力不足によって可動スクロール(70)が傾くことが原因で、圧縮室(23a,23b)から冷媒が漏れて圧縮効率が低下することを回避することができる。
この変形例1では、図7に示すように、スクロール圧縮機(1)が背圧低減機構(26)を備えている。背圧低減機構(26)は逆止弁により構成されている。
この変形例2では、図8及び図9に示すように、背圧導入通路(80)は、吐出ポート(64)が連通する直前の第1圧縮室(23a)に連通する第1入口(91)と、吐出ポート(64)が連通する直前の第2圧縮室(23b)に連通する第2入口(92)とを備えている。背圧導入通路(80)では、第1入口(91)から延びる通路と、第2入口(92)から延びる通路とが、逆流阻止機構(35)よりも圧縮室(23)側で合流している。
上記実施形態については、以下のような構成としてもよい。
20 圧縮機構
23a 第1圧縮室
23b 第2圧縮室
35 逆流阻止機構
36 弁部材
37 弾性バネ
38 弁座
40 駆動軸
53 背圧室
60 固定スクロール
61 固定側鏡板部
62 固定側ラップ
64 吐出ポート
70 可動スクロール
71 可動側鏡板部
72 可動側ラップ
75 押付機構
80 背圧導入通路
Claims (7)
- 吐出ポート(64)が形成された固定スクロール(60)と、
該固定スクロール(60)に噛み合わされ、該固定スクロール(60)と共に圧縮室(23)を形成する可動スクロール(70)とを備え、
上記可動スクロール(70)を駆動して上記圧縮室(23)の流体を圧縮するスクロール圧縮機であって、
上記可動スクロール(70)の可動側鏡板部(71)の背面に臨む背圧室(53)と、上記吐出ポート(64)が連通する直前の状態と該吐出ポート(64)が連通している状態の圧縮室(23)を上記背圧室(53)に連通させるための背圧導入通路(80)とを有し、上記背圧室(53)の内圧によって上記可動スクロール(70)を上記固定スクロール(60)に押し付ける押付機構(75)と、
上記背圧導入通路(80)の流体が上記圧縮室(23)から上記背圧室(53)へ流れることを許容し、且つ上記背圧室(53)から上記圧縮室(23)へ戻ることを阻止する逆流阻止機構(35)とを備えている
ことを特徴とするスクロール圧縮機。 - 請求項1において、
上記固定スクロール(60)及び上記可動スクロール(70)を収容するケーシング(10)内には、流体を吸入する過程の圧縮室(23)に連通する吸入側空間(24)が形成される一方、
上記背圧室(53)の内圧と上記吸入側空間(24)の圧力との差が所定の差圧基準値以上になると、上記背圧室(53)を上記吸入側空間(24)に連通させる背圧低減機構(26)を備えている
ことを特徴とするスクロール圧縮機。 - 請求項1又は2において、
上記固定スクロール(60)には、上記吐出ポート(64)が連通する直前に上記背圧導入通路(80)が連通する圧縮室(23)から圧縮過程の流体を逃がすためのリリーフポート(67)が、上記背圧導入通路(80)よりも後に該圧縮室(23)に連通するように形成されている
ことを特徴とするスクロール圧縮機。 - 請求項1乃至3の何れか1つにおいて、
上記圧縮室(23)は、上記固定スクロール(60)の固定側ラップ(62)の内側面と上記可動スクロール(70)の可動側ラップ(72)の外側面との間の第1圧縮室(23a)と、該固定側ラップ(62)の外側面と該可動側ラップ(72)の内側面との間の第2圧縮室(23b)とを備える一方、
上記可動スクロール(70)及び上記固定スクロール(60)は、上記第1圧縮室(23a)の圧縮比と上記第2圧縮室(23b)の圧縮比とが互い相違するように構成され、
上記背圧導入通路(80)は、上記第1圧縮室(23a)と第2圧縮室(23b)のうち圧縮比が大きい方の圧縮室(23a)だけに、該圧縮室(23a)に上記吐出ポート(64)が連通する直前に連通する
ことを特徴とするスクロール圧縮機。 - 請求項1乃至3の何れか1つにおいて、
上記圧縮室(23)は、上記固定スクロール(60)の固定側ラップ(62)の内側面と上記可動スクロール(70)の可動側ラップ(72)の外側面との間の第1圧縮室(23a)と、該固定側ラップ(62)の外側面と該可動側ラップ(72)の内側面との間の第2圧縮室(23b)とを備える一方、
上記背圧導入通路(80)は、上記吐出ポート(64)が連通する直前の第1圧縮室(23a)に連通する第1入口(91)と、上記吐出ポート(64)が連通する直前の第2圧縮室(23b)に連通する第2入口(92)とを備えている
ことを特徴とするスクロール圧縮機。 - 請求項1乃至5の何れか1つにおいて、
主軸部(41)と、該主軸部(41)に対して偏心して上記可動スクロール(70)に係合する偏心部(42)とを有する駆動軸(40)を備え、
上記背圧導入通路(80)は、上記可動スクロール(70)に形成される一方、
上記逆流阻止機構(35)は、上記背圧導入通路(80)における流体の流通を阻止する状態から許容する状態に切り換わる場合に所定の第1方向に移動する弁部材(36)を備え、
上記背圧導入通路(80)が連通している圧縮室(23)に上記吐出ポート(64)が連通する状態に変化する時点では、上記駆動軸(40)の軸方向から見て、上記第1方向と、上記主軸部(41)の軸心から上記偏心部(42)の軸心へ向かう直線の向きである第2方向とのなす角度が、上記駆動軸(40)の回転方向を正とした場合に、-90°以上で90°以下になっている
ことを特徴とするスクロール圧縮機。 - 請求項6において、
上記第1方向と上記第2方向とのなす角度は、上記駆動軸(40)の回転方向を正とした場合において0°以上で90°以下になっている
ことを特徴とするスクロール圧縮機。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/393,720 US8998596B2 (en) | 2009-09-02 | 2010-09-02 | Scroll compressor |
| EP10813518.7A EP2474740A4 (en) | 2009-09-02 | 2010-09-02 | SCROLL COMPRESSORS |
| CN201080034378.3A CN102472273B (zh) | 2009-09-02 | 2010-09-02 | 涡旋压缩机 |
| BR112012004379A BR112012004379A2 (pt) | 2009-09-02 | 2010-09-02 | compressor espiral que inclui um rolo fixo que possui uma porta de saida e um rolo movel encaixado com o rolo fixo e que forma uma camera de compressao em conjunto com o rolo fixo que comprime fluido da camera de compressao dirigindo o rolo móvel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009-202448 | 2009-09-02 | ||
| JP2009202448A JP4614009B1 (ja) | 2009-09-02 | 2009-09-02 | スクロール圧縮機 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011027567A1 true WO2011027567A1 (ja) | 2011-03-10 |
Family
ID=43596742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2010/005421 Ceased WO2011027567A1 (ja) | 2009-09-02 | 2010-09-02 | スクロール圧縮機 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8998596B2 (ja) |
| EP (1) | EP2474740A4 (ja) |
| JP (1) | JP4614009B1 (ja) |
| CN (1) | CN102472273B (ja) |
| BR (1) | BR112012004379A2 (ja) |
| WO (1) | WO2011027567A1 (ja) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104487A (zh) * | 2011-11-09 | 2013-05-15 | Lg电子株式会社 | 涡旋式压缩机 |
| CN103104488A (zh) * | 2011-11-09 | 2013-05-15 | Lg电子株式会社 | 涡旋式压缩机 |
| US9523361B2 (en) | 2011-01-11 | 2016-12-20 | Lg Electronics Inc. | Scroll compressor having back pressure chamber that operatively contains a discharge pressure and an intermediate pressure during different periods of time within a single compression cycle |
| JP2020165309A (ja) * | 2019-03-28 | 2020-10-08 | 株式会社豊田自動織機 | スクロール型圧縮機 |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122386A (ja) | 1982-01-13 | 1983-07-21 | Hitachi Ltd | スクロ−ル圧縮機 |
| JPH0650274A (ja) * | 1992-07-02 | 1994-02-22 | Matsushita Electric Ind Co Ltd | スクロール圧縮機 |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4596521A (en) * | 1982-12-17 | 1986-06-24 | Hitachi, Ltd. | Scroll fluid apparatus |
| JP2605688B2 (ja) * | 1986-05-09 | 1997-04-30 | 松下電器産業株式会社 | スクロール気体圧縮機 |
| JPH0826861B2 (ja) * | 1992-07-02 | 1996-03-21 | 松下電器産業株式会社 | スクロール気体圧縮機 |
| JPH08319960A (ja) | 1995-05-29 | 1996-12-03 | Sanyo Electric Co Ltd | スクロール圧縮機 |
| JP3635794B2 (ja) * | 1996-07-22 | 2005-04-06 | 松下電器産業株式会社 | スクロール気体圧縮機 |
| JP3874469B2 (ja) | 1996-10-04 | 2007-01-31 | 株式会社日立製作所 | スクロール圧縮機 |
| US5762483A (en) * | 1997-01-28 | 1998-06-09 | Carrier Corporation | Scroll compressor with controlled fluid venting to back pressure chamber |
| JP3560492B2 (ja) * | 1999-02-25 | 2004-09-02 | 株式会社日本自動車部品総合研究所 | スクロール型圧縮機 |
| JP4130113B2 (ja) * | 2002-10-07 | 2008-08-06 | 株式会社デンソー | スクロール型圧縮機 |
| JP4007189B2 (ja) * | 2002-12-20 | 2007-11-14 | 株式会社豊田自動織機 | スクロールコンプレッサ |
| EP1464841B1 (en) * | 2003-03-31 | 2012-12-05 | Kabushiki Kaisha Toyota Jidoshokki | Hermetic compressor |
| JP4156494B2 (ja) | 2003-11-06 | 2008-09-24 | 株式会社デンソー | スクロール型圧縮機 |
| JP4329528B2 (ja) * | 2003-12-19 | 2009-09-09 | 株式会社豊田自動織機 | スクロールコンプレッサ |
| JP4519489B2 (ja) * | 2004-03-15 | 2010-08-04 | 日立アプライアンス株式会社 | スクロール圧縮機 |
| KR100581557B1 (ko) * | 2004-12-14 | 2006-05-22 | 엘지전자 주식회사 | 선회베인 압축기의 배압장치 |
| US7338265B2 (en) * | 2005-03-04 | 2008-03-04 | Emerson Climate Technologies, Inc. | Scroll machine with single plate floating seal |
| US20070092390A1 (en) * | 2005-10-26 | 2007-04-26 | Copeland Corporation | Scroll compressor |
| JP2007270697A (ja) * | 2006-03-31 | 2007-10-18 | Hitachi Ltd | スクロール流体機械 |
-
2009
- 2009-09-02 JP JP2009202448A patent/JP4614009B1/ja not_active Expired - Fee Related
-
2010
- 2010-09-02 EP EP10813518.7A patent/EP2474740A4/en not_active Withdrawn
- 2010-09-02 US US13/393,720 patent/US8998596B2/en not_active Expired - Fee Related
- 2010-09-02 CN CN201080034378.3A patent/CN102472273B/zh not_active Expired - Fee Related
- 2010-09-02 BR BR112012004379A patent/BR112012004379A2/pt not_active IP Right Cessation
- 2010-09-02 WO PCT/JP2010/005421 patent/WO2011027567A1/ja not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58122386A (ja) | 1982-01-13 | 1983-07-21 | Hitachi Ltd | スクロ−ル圧縮機 |
| JPH0650274A (ja) * | 1992-07-02 | 1994-02-22 | Matsushita Electric Ind Co Ltd | スクロール圧縮機 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP2474740A4 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9523361B2 (en) | 2011-01-11 | 2016-12-20 | Lg Electronics Inc. | Scroll compressor having back pressure chamber that operatively contains a discharge pressure and an intermediate pressure during different periods of time within a single compression cycle |
| CN103104487A (zh) * | 2011-11-09 | 2013-05-15 | Lg电子株式会社 | 涡旋式压缩机 |
| CN103104488A (zh) * | 2011-11-09 | 2013-05-15 | Lg电子株式会社 | 涡旋式压缩机 |
| US20130121864A1 (en) * | 2011-11-09 | 2013-05-16 | Kitae Jang | Scroll compressor |
| US9541083B2 (en) | 2011-11-09 | 2017-01-10 | Lg Electronics Inc. | Scroll compressor including communication hole with improved back pressure chamber and back pressure hole locations |
| JP2020165309A (ja) * | 2019-03-28 | 2020-10-08 | 株式会社豊田自動織機 | スクロール型圧縮機 |
| JP7163843B2 (ja) | 2019-03-28 | 2022-11-01 | 株式会社豊田自動織機 | スクロール型圧縮機 |
Also Published As
| Publication number | Publication date |
|---|---|
| US8998596B2 (en) | 2015-04-07 |
| BR112012004379A2 (pt) | 2019-09-24 |
| EP2474740A4 (en) | 2015-05-27 |
| JP2011052603A (ja) | 2011-03-17 |
| CN102472273A (zh) | 2012-05-23 |
| JP4614009B1 (ja) | 2011-01-19 |
| US20120164014A1 (en) | 2012-06-28 |
| EP2474740A1 (en) | 2012-07-11 |
| CN102472273B (zh) | 2015-01-07 |
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