JP2011047382A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid injection circuit easily and at low cost, that is formed between respective wraps of a fixed scroll and a swing scroll of a scroll compressor, and for introducing a liquid refrigerant to a two-system compression chamber. <P>SOLUTION: A winding angle of a wrap 12B in a fixed scroll 12 is set to be 180&deg; greater than a winding angle of a wrap 14B in a swing scroll 14. Introducing holes 70 and 71 of a liquid injection circuit 60 for introducing the liquid refrigerant is opened in the fixed scroll 12 at a position corresponding to a compression chamber (compression space) 16 at an intermediate pressure of a scroll compression element 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a scroll compressor including a scroll compression element and an electric element for driving the scroll compression element in an airtight container.

  Conventionally, this type of scroll compressor includes an electric element and a scroll compression element driven by a rotating shaft of the electric element in a hermetic container. The scroll compression element is rotated by a fixed scroll having a disk-shaped end plate and a spiral wrap erected on one surface of the end plate, and a rotating scroll of the electric element with respect to the fixed scroll. It consists of a plate-shaped end plate and an orbiting scroll provided on one surface of the end plate and provided with a fixed scroll and a spiral wrap having substantially the same shape. Further, the fixed scroll has a discharge port at the center and a suction port at the outer periphery.

  Then, the wrap formed on one surface of the fixed scroll and the wrap formed on one surface of the swing scroll are meshed with each other, and a plurality of sealed spaces formed between the wraps are used as compression chambers (compression spaces). The refrigerant is compressed by gradually reducing the compression space from the outside toward the inside.

  Specifically, when the orbiting scroll rotates (revolves) by energization of the electric element, the low-temperature and low-pressure refrigerant introduced into the outer peripheral compression space formed between the fixed scroll and the orbiting scroll from the suction port. The gas is gradually compressed toward the inside to become a high-temperature and high-pressure refrigerant gas, and is discharged from the discharge port into the sealed container through the discharge hole. This refrigerant gas is discharged from the discharge pipe connected to the space in the sealed container to the outside of the scroll compressor, sequentially passes through the condenser, the decompression device, and the evaporator, and then returns from the suction pipe to the scroll compressor. The cycle of sucking into the compression space on the outer peripheral side formed between the swing scroll was repeated.

  In such a scroll compressor, a plurality of compression spaces (compression chambers) formed between the wrap formed on one surface of the fixed scroll and the wrap formed on one surface of the orbiting scroll are the wraps of the fixed scroll. One compression chamber composed of a plurality of compression spaces formed between the inner curve and the outer curve of the swing scroll wrap, and between the outer curve of the fixed scroll wrap and the inner curve of the swing scroll wrap. It is composed of two compression chambers with another compression chamber formed of a plurality of compression spaces.

  In addition, an introduction hole of a liquid injection circuit communicating with the compression space is formed in the compression space where the pressure in the two compression chambers becomes substantially intermediate pressure, that is, at a position approximately 180 ° apart from the discharge port as a center. Then, the liquid refrigerant in the refrigerant circuit is introduced from each introduction hole (that is, liquid injection) to evaporate, and the refrigerant gas compressed in each compression space is cooled by the endothermic action when the liquid refrigerant evaporates. (For example, refer to Patent Document 1).

JP 2003-184663 A

  However, in the conventional scroll compressor, since the introduction hole of the liquid injection circuit is provided at a position approximately 180 ° apart from the discharge port as a center, liquid refrigerant is introduced into each compression space from each of these introduction holes. In order to perform the injection, a passage configuration for two systems of liquid injection is required, which causes problems such as a complicated structure and an increased number of parts.

  The present invention has been made to solve the problems of the related art, and is a liquid for introducing liquid refrigerant into two compression chambers formed between wraps of a fixed scroll and a swing scroll. An object of the present invention is to provide a scroll compressor in which an injection circuit can be provided easily and at low cost.

  That is, the scroll compressor according to the first aspect of the present invention is provided with a scroll compression element and an electric element for driving the scroll compression element in an airtight container, and the scroll compression element is spirally formed on one surface of the end plate. A fixed scroll with a wrap standing upright, and an orbiting scroll with a spiral wrap standing on one side of the end plate, which is revolved by the rotating shaft of the electric element with respect to the fixed scroll. The refrigerant is compressed by gradually reducing a plurality of compression spaces formed by meshing the wraps from the outside toward the inside. The winding angle of the wrap of the fixed scroll is the same as that of the swing scroll wrap. The liquid refrigerant is set on the fixed scroll at a position corresponding to the intermediate pressure compression chamber of the scroll compression element, which is set 180 ° larger than the winding angle. Characterized in that the inlet holes of the liquid injection circuit for introducing was opened.

  The scroll compressor according to the invention of claim 2 is provided with a scroll compression element and an electric element for driving the scroll compression element in an airtight container, and the scroll compression element is provided with a spiral wrap on one surface of the end plate. A fixed scroll that is erected and an orbiting scroll that is pivoted by the rotating shaft of the electric element with respect to the fixed scroll and has a spiral wrap erected on one surface of the end plate. The refrigerant is compressed by gradually reducing a plurality of compression spaces formed by meshing with each other from the outside toward the inside, and the wrapping angle of the fixed scroll wrap is the wrapping angle of the oscillating scroll wrap. And 180 ° larger than the fixed scroll discharge holes on both sides of the fixed scroll wrap. Characterized in that the inlet holes of the liquid injection circuit for introducing the liquid refrigerant, respectively are opened.

  According to a third aspect of the present invention, the scroll compressor includes a liquid injection passage that is formed in the fixed scroll and communicates with the introduction hole in each of the above-described inventions, and a liquid injection pipe that constitutes a liquid injection circuit is provided in the liquid injection passage. It is characterized by direct connection.

  A scroll compressor according to a fourth aspect of the invention is characterized in that, in the invention according to the first or second aspect, a pin member for narrowing the passage is provided in the liquid injection passage communicating with the introduction hole.

  According to a fifth aspect of the present invention, in the scroll compressor according to the first or second aspect, the introduction hole passes through the fixed scroll and has a liquid injection passage communicating with the introduction hole. The attachment member is attached to the fixed scroll, and the liquid injection pipe constituting the liquid injection circuit is attached to the attachment member and connected to the liquid injection passage.

  According to a sixth aspect of the present invention, there is provided a scroll compressor according to any one of the fourth to fifth aspects, wherein the scroll compressor is attached to the fixed scroll and communicates with the liquid injection pipe and the liquid injection passage in the fixed scroll. Between the intermediate member having the two liquid injection passages and the fixed scroll, or between the mounting member and the fixed scroll, a seal material is provided outside the liquid injection passage.

  According to the first aspect of the present invention, the scroll compression element and the electric element for driving the scroll compression element are provided in the sealed container, and the scroll compression element is provided with a spiral wrap on one surface of the end plate. The fixed scroll and an orbiting scroll having a spiral wrap erected on one surface of the end plate, which is orbited by the rotating shaft of the electric element with respect to the fixed scroll. In a scroll compressor that compresses a refrigerant by gradually reducing a plurality of compression spaces formed together from the outside toward the inside, the wrapping angle of the fixed scroll is 180 from the wrapping angle of the oscillating scroll. ° Liquid refrigerant is introduced into the fixed scroll at a position corresponding to the intermediate pressure compression chamber of the scroll compression element. Since it was opened inlet holes for liquid injection circuit because it is possible to bring the position of each introduction hole.

  As a result, the passage configuration of the liquid injection circuit for introducing the liquid refrigerant into each introduction hole can be simplified, and the size can be reduced.

  According to the invention of claim 2, the scroll compression element and the electric element for driving the scroll compression element are provided in the sealed container, and the scroll compression element is provided with a spiral wrap on one surface of the end plate. The fixed scroll and an orbiting scroll having a spiral wrap erected on one surface of the end plate, which is orbited by the rotating shaft of the electric element with respect to the fixed scroll. In a compressor that compresses a refrigerant by gradually reducing a plurality of compression spaces formed together from the outside toward the inside, the wrapping angle of the fixed scroll is 180 ° from the wrapping angle of the oscillating scroll. The liquid refrigerant is applied to both sides of the wrap of the fixed scroll at a position that is set large and does not communicate with the discharge hole of the fixed scroll. Since the introduction holes of the liquid injection circuit for input respectively are opened, it is possible to form the closest position both inlet holes.

  As a result, the passage configuration of the liquid injection circuit for introducing the liquid refrigerant into the respective introduction holes can be further simplified and the size can be reduced.

  According to the invention of claim 3, since the liquid injection passage formed in the fixed scroll in each of the above inventions and communicating with the introduction hole is provided, and the liquid injection pipe constituting the liquid injection circuit is directly connected to the liquid injection passage. In addition, it is possible to form a liquid injection circuit with an extremely simple structure in which an introduction hole and a liquid injection passage communicating with the introduction hole are formed in the fixed scroll, and a liquid injection pipe is directly connected to the liquid injection passage.

  In addition, since the number of parts can be minimized, the manufacturing cost can be effectively reduced.

  According to the invention of claim 4, since the pin member for narrowing the passage is provided in the liquid injection passage in the invention of claim 1 or 2, the area of the liquid refrigerant passage is narrowed by the pin member. It is possible to prevent inconvenience that the liquid refrigerant evaporates in the passage.

  In particular, by forming a liquid injection passage with a large diameter in the fixed scroll and adjusting the area of the passage with a pin, the desired passage can be formed. No need to form.

  According to the invention of claim 5, in the invention according to claim 1 or 2, the introduction hole passes through the fixed scroll, and the mounting member having a liquid injection passage communicating with the introduction hole is provided. Since the liquid injection pipe that is attached to the fixed scroll and constitutes the liquid injection circuit is attached to the mounting member and connected to the liquid injection passage, the introduction hole is formed through the fixed scroll, and the liquid injection passage that communicates with the introduction hole is formed. The liquid injection circuit can be configured with a simple configuration in which the mounting member is attached to the fixed scroll.

  According to the invention of claim 6, in the invention according to any one of claims 3 to 5, the second is attached to the fixed scroll and communicates the liquid injection pipe and the liquid injection passage in the fixed scroll. Since a sealing material is provided between the intermediate member having the liquid injection passage and the fixed scroll, or between the mounting member and the fixed scroll, located outside the liquid injection passage, the intermediate member and the fixed scroll, or the mounting member. And the inconvenience that the liquid refrigerant of the liquid injection circuit leaks into the sealed container from between the fixed scrolls can be surely avoided.

It is a vertical side view of the scroll compressor of one Example to which this invention is applied (Example 1). It is the elements on larger scale of the scroll compressor of FIG. It is a figure which shows the positional relationship of the compression space formed between the wrap of the fixed scroll of the scroll compressor of FIG. 2, and the wrap of a rocking | scrolling scroll, and the introduction hole of a liquid injection circuit. It is the elements on larger scale of the scroll compressor of other Examples (Example 2). FIG. 5 is a diagram showing a positional relationship between a compression space formed between a fixed scroll wrap and a swing scroll wrap of the scroll compressor of FIG. 4 and an introduction hole of a liquid injection circuit. It is the elements on larger scale of the fixed scroll of another other Example (Example 3). It is the elements on larger scale of the conventional scroll compressor. FIG. 8 is a diagram illustrating a positional relationship between a compression space formed between a fixed scroll wrap and a swing scroll wrap of the conventional scroll compressor of FIG. 7 and an introduction hole of a liquid injection circuit.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a longitudinal side view of an embodiment of a scroll compressor to which the present invention is applied. The scroll compressor 1 of the present embodiment is connected to a condenser, a decompression device, and an evaporator (cooler) (not shown) to form a known refrigerant circuit. The scroll compressor 1 is positioned below the scroll compression element 10, a vertical cylindrical sealed container 2 made of a steel plate, a scroll compression element 10 housed in an upper portion of the internal space of the sealed container 2, An electric element (motor) 20 that drives the scroll compression element 10 is configured.

  The hermetic container 2 has an oil reservoir 6 at the bottom, and is attached so as to close an opening at one end (upper end) of the container body 4 and a container body 4 having a vertically long cylindrical shape that houses the electric element 20 and the scroll compression element 10. 4A, and a substantially bowl-shaped bottom cap 4B attached so as to close the opening at the other end (lower end) of the container body 4. Although not shown in FIG. 1, a circular attachment hole is formed in the container body 4 of the sealed container 2 between the electric element 20 and the scroll compression element 10, and electric power is supplied to the electric element 20 through this attachment hole. A terminal is installed to

  An upper support frame 28 is provided in the sealed container 2. The periphery of the upper support frame 28 is fixed to the container body 4 by welding, and the inside of the sealed container 2 is divided into a discharge chamber 42 and an electric element chamber 43 by the upper support frame 28. The discharge chamber 42 is formed on the end cap 4A side (upper side) of the upper support frame 28, and the electric element chamber 43 is formed on the bottom cap 4B side (lower side) of the upper support frame 28. Specifically, the discharge chamber 42 is formed between the scroll compression element 10 and the end cap 4A.

  The scroll compression element 10 includes a fixed scroll 12 fixed to the upper support frame 28, and an orbiting scroll 14 that is turned by the rotary shaft 22 of the electric element 20 with respect to the fixed scroll 12. The fixed scroll 12 is composed of a disc-shaped end plate 12A and a wrap 12B which is erected on one surface (lower surface) of the end plate 12 and formed in an involute curve or a curve approximate thereto. A discharge port 17 and a discharge hole 19 communicating with the discharge port 17 are provided at the center, and a suction port (not shown) is provided at the outer periphery.

  Further, a position corresponding to the discharge port 17 on the other surface (upper surface) of the end plate 12A is recessed, and the upper end of the discharge hole 19 is opened at a substantially central portion of the recessed portion 13, and the discharge chamber 42 is in communication. And the opening of the said discharge hole 19 is obstruct | occluded by the discharge valve 19V attached to the recessed part 13 so that opening and closing is possible. Furthermore, introduction holes 70 and 71 of a liquid injection circuit 60 described later are formed in the end plate 12A of the fixed scroll 12 (FIG. 2).

  A discharge pipe 50 made of a metal pipe is welded and fixed to the sealed container 2 (end cap 4A) at a position corresponding to the upper side of the fixed scroll 12, and one end of the discharge pipe 50 is sealed in the sealed container 2. A predetermined dimension extends inside and opens in the discharge chamber 42 of the sealed container 2. The other end of the discharge pipe 50 is connected to the inlet side of an external condenser (not shown).

  The orbiting scroll 14 is erected on a disk-shaped end plate 14A and one surface (upper surface) of the end plate 14A (is erected on the upper surface), and is formed in an involute curve or a curve approximate thereto. The wrap 14B and a boss 29 provided on the surface (lower surface) opposite to the surface (upper surface) on which the wrap 14B of the end plate 14A is formed and having a boss hole at the center. A bearing portion 30 is formed at the center of the upper support frame 28, and the upper portion of the rotating shaft 22 is supported on the bearing portion 30.

  An oil pump 76 is provided below the rotary shaft 22. The oil pump 76 sucks up the oil accumulated in the oil reservoir 6 formed in the inner bottom portion of the sealed container 2 by the rotation of the rotating shaft 22, and compresses the scroll through the oil passage 77 formed in the rotating shaft 22 in the vertical direction. Supplied to the swinging portion of the machine 1 (between the rotary shaft 22 and the bearing portion 30, between the eccentric shaft 22A and the boss 29 described later, between the swinging scroll 14 and the upper support frame 28, etc.).

  The electric element 20 is formed in a substantially annular shape, and has a stator 23 fixed to the inner surface of the container body 4 of the hermetic container 2, and an inner surface of the stator 23 with a small allowable interval on the inner surface of the stator 23. And a rotor 25 provided so as to be rotatable. The stator 23 includes a laminated body 23A in which a plurality of electromagnetic steel plates are laminated, and a stator coil 24 wound around the tooth portion. The rotor 25 is also formed of a laminated body 26 of electromagnetic steel sheets, like the stator 23.

  A suction pipe 51 made of a metal pipe is welded and fixed to the sealed container 2 (container body 4) at a position corresponding to the lower side of the electric element 20, and one end of the suction pipe 51 is sealed in the sealed container 2. A predetermined dimension extends inside and opens in the electric element chamber 43 of the sealed container 2. The other end of the suction pipe 51 is connected to the outlet side of an external evaporator (not shown).

  On the other hand, a rotating shaft 22 that drives the scroll compression element 10 is fitted in the center of the rotor 25. And the lower part of the rotating shaft 22 is pivotally supported by the lower support frame 52 used as a sub bearing. The lower support frame 52 is fixed to the container body 4 of the sealed container 2 below the electric element 20 by welding or the like.

  An eccentric shaft (pin) 22A is provided at the top end of the rotary shaft 22 so that the shaft center of the rotary shaft 22 is deviated from the axis of the predetermined dimension. It is rotatably inserted into the boss hole. The fixed scroll 12 is fixed to the upper support frame 28 by a plurality of bolts (not shown), and the orbiting scroll 14 is supported on the upper support frame 28 by an Oldham mechanism 40 including an Oldham ring 41 and an Oldham key. Thus, the orbiting scroll 14 is configured to perform a turning motion without rotating with respect to the fixed scroll 12.

  In other words, the oscillating scroll 14 is fixed by the Oldham ring 41 by driving the boss 29 inserted eccentrically with respect to the axis of the rotating shaft 22 by the eccentric shaft 22A eccentric with respect to the axis of the rotating shaft 22. Revolve on a circular path so as not to rotate with respect to the scroll 12. Then, due to the revolution, the fixed scroll 12 and the orbiting scroll 14 are formed between the fixed scroll 12 and the orbiting scroll 14 in a state where the wraps 12B and 14B of the fixed scroll 12 and the orbiting scroll 14 are engaged with each other. The plurality of crescent-shaped compression spaces (compression chambers) 16 are gradually reduced from the outside to the inside to compress the refrigerant. With such a configuration, the low-temperature and low-pressure refrigerant gas that has entered the compression space 16 from the outside suction port is gradually compressed toward the inside from there, and becomes a high-temperature and high-pressure refrigerant gas, and is discharged from the discharge port 17 through the discharge hole 19. Thus, the ink is discharged into the discharge chamber 42.

  On the other hand, the wrap 12B of the fixed scroll 12 described above is set to have a winding angle approximately 180 ° larger than that of the wrap 14B of the swing scroll 14. That is, the wrap 12B of the fixed scroll 12 is configured such that the winding angle extends approximately 180 ° larger than the winding end angle of the wrap 14B of the orbiting scroll 14.

  Specifically, in this embodiment, the winding angle of the wrap 14B of the orbiting scroll 14 is 1080 °, whereas the fixed scroll 12 is 1260 °, which is 180 ° larger than the winding angle of the wrap 14B. The winding angle of the wrap 12B is set. For this reason, the pressure of the compression chamber composed of a plurality of compression spaces 16 formed between the inner curve of the wrap 12B of the fixed scroll 12 and the outer curve of the wrap 14B of the swing scroll 14 and the other fixed scroll 12 The pressure of the compression chamber composed of a plurality of compression spaces 16 formed between the outer curve of the wrap 12B and the inner curve of the wrap 14B of the orbiting scroll 14 is different.

  Here, the above-described liquid injection circuit 60 will be described in detail with reference to FIGS. The liquid injection circuit 60 is for introducing a liquid refrigerant into the scroll compression element 10. Specifically, the liquid injection circuit 60 includes a portion in which the liquid refrigerant on the high-pressure side of the refrigerant circuit flows (for example, a refrigerant liquid pipe or a receiver on the condenser outlet side (not shown)) and the vicinity of the intermediate pressure portion in the middle of compression. The refrigerant in the compression space 16 is communicated by a narrow passage, and the liquid refrigerant in the refrigerant circuit is guided into the compression space 16 due to a pressure difference and expanded there. This is for cooling the gas.

  The liquid injection circuit 60 of this embodiment includes two introduction holes 70 and 71 formed in the fixed scroll 12, a liquid injection passage 74 formed in the attachment member 80 and communicating with the introduction holes 70 and 71, and the liquid A liquid injection pipe 78 communicating with the injection passage 74 is used.

  One end of the liquid injection pipe 78 is connected to a middle part of the pipe connecting the outlet side of the condenser of the refrigerant circuit and the pressure reducing device, or to a liquid receiving pipe provided between the condenser and the pressure reducing device. . Then, the sealed container 2 (end cap 4 </ b> A) of the scroll compressor 1 is penetrated from the one end, and the other end is inserted and connected to a liquid injection passage 74 provided in the attachment member 80 and opened in the passage 74. is doing. That is, the piping 78 of the liquid injection circuit 60 is connected to the mounting member 80.

  The attachment member 80 is disposed on the outer peripheral side of the recessed portion 13 on the other surface (upper surface) of the fixed scroll 12, and is attached to the upper surface of the fixed scroll 12 by a bolt 81. A liquid injection passage 74 is formed in the attachment member 80. The liquid injection passage 74 includes a communication passage 82 formed on a surface (lower surface) that contacts the upper surface of the fixed scroll 12 of the mounting member 80, a passage 83 communicating with the communication passage 82, and a direction orthogonal to the passage 83. It is comprised by the channel | path 84 extended to.

  The communication path 82 is provided along a surface (lower surface) that contacts the upper surface of the fixed scroll 12 of the mounting member 80. One end of the communication path 82 corresponds to the upper end of the introduction hole 70 formed in the fixed scroll 12, and the other end is arranged to correspond to the upper end of the introduction hole 71. The passage 83 is provided so as to extend the mounting member 80 in the axial direction (vertical direction) of the rotary shaft 22, and one end (lower end) thereof communicates with the middle portion of the communication passage 82. . The passage 83 rises upward from one end (lower end) communicating with the middle portion of the communication passage 82, and the other end is located in the attachment member 80.

  Further, the passage 84 is provided so as to extend in a direction orthogonal to the passage 83. One end of the passage 84 communicates with the other end (upper end) of the passage 83, and extends from the attachment member 80 in a direction (lateral direction) orthogonal to the passage 83. Opened on the outer peripheral surface. The liquid injection pipe 78 is attached to the opening at the other end of the passage 84. That is, the liquid injection pipe 78 is connected to the liquid injection passage 74.

  On the other hand, the introduction holes 70 and 71 are formed in the fixed scroll 12. The introduction holes 70, 71 are formed so as to penetrate the end plate 12 </ b> A at the outer periphery of the discharge hole 19 and not provided with the wrap 12 </ b> B in the axial direction (vertical direction) of the rotary shaft 22. The upper end of the introduction hole 70 communicates with one end of the communication passage 82 of the liquid injection passage 74, and the upper end of the introduction hole 71 communicates with the other end of the communication passage 82 of the liquid injection passage 74.

  Further, since the introduction holes 70 and 71 are provided so as to penetrate the end plate 12A at the position where the wrap 12B is not provided as described above in the axial direction of the rotary shaft 22, the lower end of the introduction holes 70 and 71 is the end plate 12A. It is comprised so that it can communicate with the space (compression space 16) between the lap | wraps 12B by this opening.

  In particular, in this embodiment, the introduction holes 70 and 71 of the liquid injection circuit 70 for introducing the liquid refrigerant are opened in the fixed scroll 12 at a position corresponding to the compression chamber 16 of the substantially intermediate pressure of the scroll compression element 10. Yes. Specifically, as shown in FIG. 3, the introduction hole 70 of this embodiment includes an inner curve of the wrap 12 </ b> B of the fixed scroll 12 and an outer curve of the wrap 14 </ b> B of the rocking scroll 14 in the compression space 16. In the compression spaces 16a, 16c, and 16e formed between the two, the lower end of the compression space 16c is positioned so that the lower end is opened in the compression space 16c where the pressure of the refrigerant gas becomes substantially intermediate pressure. The introduction hole 71 is formed in the compression spaces 16b, 16d, and 16f formed between the outer curve of the wrap 12B of the fixed scroll 12 and the inner curve of the wrap 14B of the orbiting scroll 14 in the compression space 16. The refrigerant gas is positioned so that its lower end opens in the compression space 16d where the pressure of the refrigerant gas becomes substantially intermediate pressure.

  The introduction holes 70 and 71 have a diameter smaller than the thickness dimension of the wrap 14B of the orbiting scroll 14, and the upper end surface of the wrap 14B is configured to open and close the openings at the lower ends of the introduction holes 70 and 71. . That is, when the wrap 14B is positioned immediately below the introduction holes 70 and 71, the introduction holes 70 and 71 are blocked by the upper end surface of the wrap 14B. In this case, the liquid refrigerant is not introduced from the liquid injection circuit 60 into the compression space 16 (16c, 16d) because the compression space 16 (16c, 16d) and the liquid injection circuit 60 do not communicate with each other. On the other hand, when the upper end of the wrap 14B is displaced from the introduction holes 70 and 71 and the openings at the lower ends of the introduction holes 70 and 71 are opened, the inside of the compression space 16 (16c and 16d) communicates with the liquid injection circuit 60. . As a result, the liquid refrigerant is introduced from the liquid injection circuit 60 into the compression space 16 (16c, 16d).

  Further, an O-ring 87 serving as a sealing material is provided between the attachment member 80 and the fixed scroll 12 so as to be located outside the communication passage 82 of the liquid injection passage 74. Specifically, as shown in FIG. 2, the O-ring 87 is located on the outer periphery of the portion where the upper ends of the introduction holes 70 and 71 between the mounting member 80 and the fixed scroll 12 abut against the lower surface of the communication path 82. Thus, the liquid refrigerant of the liquid injection circuit 60 is provided to prevent leakage into the sealed container 2 from the communication path 82 and the connecting portion between the communication path 82 and the introduction holes 70 and 71.

  In this embodiment, a circular groove (not shown) is formed on the outer periphery of the communication passage 82 on the lower surface of the attachment member 80, and an O-ring 87 is attached in this groove. With this configuration, it is possible to seal the liquid injection passage 74 and the connecting portion between the liquid injection passage 74 and the introduction holes 70 and 71.

  Here, a conventional liquid injection circuit will be described with reference to FIGS. FIG. 7 is a partially enlarged view of a longitudinal side surface of a conventional scroll compressor, and FIG. 8 is a compression space formed between a fixed scroll wrap and a swing scroll wrap of the scroll compressor of FIG. 7, and a liquid injection circuit. It is a figure which shows the positional relationship of this introduction hole. 7 and 8 that are denoted by the same reference numerals as those in FIGS. 1 to 6 have the same or similar effects or actions, and therefore the description thereof is omitted here. .

  The wrap 112B of the fixed scroll 112 shown in FIGS. 7 and 8 is configured at substantially the same winding angle as the wrap 114B of the swing scroll 114. 7 and 8, 160 is a liquid injection circuit, 170 and 171 are introduction holes formed in the fixed scroll 112, 180 is an attachment member, and 174 is a liquid injection passage formed in the attachment member 180. Each of the introduction holes 170 and 171 is provided in the fixed scroll 112 at a position corresponding to the compression chamber 16 having a substantially intermediate pressure of the scroll compression element 10.

  Specifically, the introduction hole 170 is formed between the inner curve of the wrap 112B of the fixed scroll 112 and the outer curve of the wrap 114B of the swing scroll 114 in the compression space 16, as shown in FIG. The compression spaces 116a, 116c, and 116e are positioned so that the lower end is opened in the compression space 116c where the refrigerant gas pressure is approximately intermediate pressure. The introduction hole 171 is formed in the compression spaces 116b, 116d, and 116f formed between the outer curve of the wrap 1112B of the fixed scroll 112 and the inner curve of the wrap 114B of the orbiting scroll 114 in the compression space 16. The refrigerant gas is positioned so that the lower end is opened in the compression space 116d where the pressure of the refrigerant gas is substantially intermediate.

  Thus, in the scroll compressor in which the wraps 112B and 114B of the conventional fixed scroll 112 and the swing scroll 114 are configured at substantially the same winding angle, as shown in FIG. Therefore, the two introduction holes 170 and 171 provided at positions corresponding to the compression spaces 116c and 116d of the intermediate pressure are extremely separated from each other. It was. For this reason, the liquid injection passage 174 for guiding the liquid refrigerant to the introduction holes 170 and 171 becomes longer, and there is a problem that the mounting member 180 provided with the liquid injection passage 174 attached to the upper surface of the fixed scroll 112 is enlarged. It was.

  Further, since the discharge hole 19 and the discharge valve 19V are on the shortest path connecting the introduction holes 170 and 171 with a straight line, the liquid injection pipe 78 and the discharge valve 19V are not disturbed by the discharge hole 19 and the discharge valve 19V. Since the liquid injection passage 174 for connecting the introduction holes 170 and 171 has to be provided, there is a disadvantage that the structures of the liquid injection passage 174 and the mounting member 180 are complicated.

  Furthermore, in such a configuration, it is necessary to individually form the liquid injection passage 174 for communicating with the openings at the upper ends of the introduction holes 170 and 171 (that is, corresponding to the passages 175 and 176 in FIG. 7). Therefore, O-rings 178 and 179 as sealing materials for sealing the periphery thereof are also required separately. For this reason, there is also a problem that the number of parts increases, leading to an increase in manufacturing cost.

  Therefore, by setting the winding angle of the wrap 12B of the fixed scroll 12 180 degrees larger than the winding angle of the wrap 14B of the orbiting scroll 14 as in the present invention, the compression space 16 where the pressure of the refrigerant gas becomes substantially intermediate pressure is set. It becomes possible to be close. And by providing the introduction holes 70 and 71 in the compression space 16 that is substantially intermediate pressure, it is formed between the inner curve of the wrap 12B of the fixed scroll 12 and the outer curve of the wrap 14B of the orbiting scroll 14. Opening into the compression space 16 (16d) formed between the introduction hole 70 that opens into the compression space 16 (16c), the outer curve of the wrap 12B of the fixed scroll 12, and the inner curve of the wrap 14B of the orbiting scroll 14. The introduction hole 71 to be close is located.

  Accordingly, the liquid injection passage 74 connecting the liquid injection pipe 78 and the introduction holes 70 and 71 can be shortened, and the mounting member 80 provided with the liquid injection passage 74 can be made compact. become. In particular, since the discharge hole 19 and the discharge valve 19V do not exist on the shortest path connecting the introduction holes 70 and 71 in a straight line, the communication passage 82 communicating with both the introduction holes 70 and 71 of the liquid injection passage 74 is aligned. Therefore, it is possible to eliminate the inconvenience that the structures of the liquid injection passage 74 and the mounting member 80 are complicated.

  Furthermore, the problem that the liquid refrigerant of the liquid injection circuit 60 leaks from the space between the fixed scroll 12 and the mounting member 80 into the sealed container 2 can be reliably avoided by simply mounting one O-ring 87 on the outer periphery of the communication path 82. Thus, the number of parts can be reduced. As described above in detail, according to the present invention, the liquid injection circuit 60 can be configured with a simple structure and at a low cost.

  Next, the operation of the scroll compressor 1 with the above configuration will be described. In the following description, it is assumed that a predetermined refrigerant is sealed in the refrigerant circuit and oil that is compatible with the refrigerant is sealed in advance. When the stator coil 24 of the electric element 20 is energized by the power supply from the terminal and the rotor 25 rotates, the rotational force is transmitted to the orbiting scroll 14 via the rotating shaft 22, and the orbiting scroll 14 revolves. To do.

  That is, the orbiting scroll 14 is driven by a boss 29 having a boss hole inserted in the eccentric shaft 22A of the rotary shaft 22 so as to be eccentric with respect to the axis of the rotary shaft 22, and the Oldham ring 41 is used for the fixed scroll 12. To revolve on a circular orbit so that it does not rotate.

  The fixed scroll 12 and the orbiting scroll 14 gradually reduce the compression space 16 formed between the wraps 12B and 14B from the outside toward the inside, thereby compressing the refrigerant. As a result, the low-temperature and low-pressure refrigerant gas discharged from the suction pipe 51 to the electric element chamber 43 in the sealed container 2 is formed on the outer peripheral side compression space formed between the fixed scroll 12 and the orbiting scroll 14 from the suction port. The refrigerant gas is introduced into 16 and gradually compressed as the refrigerant gas moves inward to become a high-temperature and high-pressure refrigerant gas.

  Due to the pressure of the refrigerant gas, the discharge valve 19V attached to the recessed portion 13 on the upper surface of the end plate 12A opens, and the discharge chamber 42 and the compression space 16 communicate with each other through the discharge port 17 and the discharge hole 19. Thus, the high-temperature and high-pressure refrigerant gas in the compression space 16 passes through the discharge port 17 and the discharge hole 19 and is discharged into the discharge chamber 42.

  The high-temperature and high-pressure refrigerant gas discharged into the discharge chamber 42 enters the discharge pipe 50 opened in the space 42, exits the scroll compressor 1, is condensed by the condenser, and is decompressed by the decompression device. The refrigerant evaporates into a low-temperature and low-pressure refrigerant gas and returns to the scroll compressor 1 (the electric element chamber 43 in the sealed container 2) from the suction pipe 51. Then, the cycle of being sucked into the compression space 16 on the outer peripheral side formed between the fixed scroll 12 and the orbiting scroll 14 from the suction port of the scroll compression element 10 is repeated.

  Next, a scroll compressor according to another embodiment to which the present invention is applied will be described with reference to FIGS. 4 is a partially enlarged view of a longitudinal side surface of the scroll compressor of the present embodiment, and FIG. 5 is a compression space formed between the fixed scroll wrap and the swing scroll wrap of FIG. 4 and the introduction hole of the liquid injection circuit. It is a figure which shows these positional relationships. 4 and 5 that have the same reference numerals as those in FIGS. 1 to 3 have the same or similar effects or actions, description thereof is omitted here.

  4 and 5, reference numerals 90 and 91 denote introduction holes of the liquid injection circuit 60 of the present embodiment for introducing the liquid refrigerant. The liquid injection circuit 60 of the present embodiment is formed in the introduction holes 90 and 91 and the liquid injection passage 92 formed in the fixed scroll 12, and in the intermediate member 95, and is connected to the liquid injection passage 92 of the fixed scroll 12. A liquid injection 94 and a liquid injection pipe 78 are included.

  The liquid injection pipe 78 has one end in the middle part of the pipe connecting the outlet side of the condenser of the refrigerant circuit and the pressure reducing device, or a liquid receiving pipe provided between the condenser and the pressure reducing device, as in the above embodiment. Is connected. The one end penetrates the sealed container 2 (end cap 4A) of the scroll compressor 1 and the other end is inserted and connected to a second liquid injection passage 94 provided in the intermediate member 95. Open at. That is, the pipe 78 of the liquid injection circuit 60 is connected to the intermediate member 95.

  The intermediate member 95 is disposed on the outer peripheral side of the recessed portion 13 on the other surface (upper surface) of the fixed scroll 12, similarly to the mounting member 80 of the embodiment, and a bolt 98 is attached to the upper surface of the fixed scroll 12. It is attached. A second liquid injection passage 94 is formed in the intermediate member 95. The liquid injection passage 94 includes a passage 96 extending in the axial direction of the rotary shaft 22 and a passage 97 extending in a direction orthogonal to the passage 96.

  The passage 96 is provided so as to correspond to the upper end of the liquid injection passage 92 formed in the fixed scroll 12. The passage 96 opens at the lower surface of the intermediate member 95, extends from one end (lower end) communicating with the liquid injection passage 92 in the axial direction (upward direction) of the rotary shaft 22, and the other end (upper end) is the intermediate member. 95.

  Further, the passage 97 has one end communicating with the other end (upper end) of the passage 96 and extending from the inside in the intermediate member 95 in a direction perpendicular to the passage 96 (lateral direction). Opened at 95 outer peripheral surface. The liquid injection pipe 78 is attached to the opening at the other end of the passage 97. That is, the liquid injection pipe 78 is connected to the second liquid injection passage 94.

  On the other hand, the fixed scroll 12 of the present embodiment is formed with introduction holes 90 and 91 and a liquid injection passage 92 constituting the liquid injection circuit 60. The introduction holes 90 and 91 of this embodiment are provided so as to open on both sides of the wrap 12B of the fixed scroll 12 at a position not communicating with the discharge hole 17 of the fixed scroll 12, respectively. In this case, both the introduction holes 90 and 91 are not positions corresponding to the compression chamber (compression space) 16 having a substantially intermediate pressure, unlike the introduction holes 70 and 71 of the above-described embodiment, but in the vicinity of the central portion communicating with the discharge hole 17. It is provided so as to open at a position where the pressure is lower than the high pressure of the compression space 16 and higher than the low pressure near the suction port on the outer peripheral side.

  Further, the introduction holes 90 and 91 of this embodiment do not penetrate the end plate 12B of the fixed scroll 12 like the introduction holes 70 and 71 of the above-described embodiment. That is, the lower ends of the introduction holes 90 and 91 are open to one surface (lower surface) of the end plate 12A, similar to the introduction holes 70 and 71 of the above embodiment, but the upper end is the other surface (upper surface) of the end plate 12A. ), But not in the opening 12A. A liquid injection passage 92 is formed at the upper ends of the introduction holes 90 and 91, and the upper end of the liquid injection passage 92 opens at the other surface (upper surface) of the end plate 12A. The introduction holes 90 and 91 have a diameter smaller than the thickness dimension of the wrap 14B of the orbiting scroll 14, and the opening at the lower end of each introduction hole 90 and 91 can be opened and closed by the upper end surface of the wrap 14B.

  That is, when the wrap 14B is positioned immediately below the introduction holes 90 and 91, the introduction holes 90 and 91 are blocked by the upper end surface of the wrap 14B. In this case, the liquid refrigerant is not introduced from the liquid injection circuit 60 into the compression space 16 (16c, 16f) because the compression space 16 (16c, 16f) and the liquid injection circuit 60 do not communicate with each other. On the other hand, when the upper end of the wrap 14B is displaced from the introduction holes 90 and 91 and the openings at the lower ends of the introduction holes 90 and 91 are opened, the inside of the compression space 16 (16c and 16f) communicates with the liquid injection circuit 60. . As a result, the liquid refrigerant is introduced from the liquid injection circuit 60 into the compression space 16 (16c, 16f).

  On the other hand, the liquid injection passage 92 is a large-diameter passage communicating with introduction holes 90 and 91 formed on both sides of the wrap 12B of the fixed scroll 12, and the upper end of the liquid injection passage 92 is the second liquid injection 94 of the intermediate member 95. It is provided so as to communicate with the passage 96. In this case, the liquid injection passage 92 and the passage 96 of the second liquid injection passage 94 have substantially the same diameter. In the first liquid injection passage 92 and the second liquid injection passage 94, a pin member 100 for narrowing the passage is provided. The pin member 100 of this embodiment is attached by press-fitting into a vertical hole (not shown) formed at the upper end of the passage 96 of the second liquid injection passage 94.

  Further, an O-ring 105 serving as a sealing material is provided between the intermediate member 95 and the fixed scroll 12 so as to be located outside the passage 96 of the second liquid injection passage 94. Specifically, as shown in FIG. 4, the O-ring 105 is a portion where the upper end of the liquid injection passage 92 between the intermediate member 95 and the fixed scroll 12 and the lower end of the passage 96 of the second liquid injection 94 abut. The liquid refrigerant of the liquid injection circuit 60 is provided to prevent the liquid refrigerant in the liquid injection circuit 60 from leaking into the sealed container 2 from the connection portion between the passage 96 and the liquid injection passage 92.

  In this embodiment, a circular groove (not shown) is formed on the outer periphery of the passage 96 on the lower surface of the intermediate member 95, and an O-ring 105 is attached in this groove. With this configuration, the connection portion between the liquid injection passage 92 and the passage of the second liquid injection passage 94 can be sealed.

  Even when the introduction holes 90 and 91 of the liquid injection circuit 60 are respectively opened on both sides of the wrap of the wrap 12B of the fixed scroll 12 at a position not communicating with the discharge hole 19 of the fixed scroll 12 as in this embodiment, Similarly to the embodiment, the liquid injection passage 94 connecting the liquid injection pipe 78 and the introduction holes 90 and 91 can be shortened, and the intermediate member 95 including the liquid injection passage 64 can be made compact. become able to.

  In particular, by forming both the introduction holes 90 and 91 corresponding to both sides of the wrap 12B of the fixed scroll 12 as in the present embodiment, the both introduction holes 90 and 91 can be formed at the closest positions. Become. As a result, the passage configuration of the liquid injection circuit 60 for introducing the liquid refrigerant into the respective introduction holes 90 and 91 can be further simplified, and further downsizing can be achieved. In addition, the O-ring 105 attached to the outside of the connection portion between the liquid injection passage 92 and the passage 96 of the second liquid injection passage 94 can be reduced in size.

  Furthermore, the fixed scroll 12 is provided with a liquid injection passage 92 communicating with each of the introduction holes 90, 91, and the intermediate member 95 is provided with a passage 96 of a second liquid injection passage 94 communicating with the passage 92. In addition, by attaching the pin member 100 for narrowing the passage, it is possible to form a desired narrow passage without complicated processing of the fixed scroll and the intermediate member 95. As a result, it is possible to prevent the liquid refrigerant from expanding and evaporating in the passages 92 and 96.

  In each of the above-described embodiments, the mounting member 80 or the intermediate member 95 is attached to the other surface (upper surface) of the fixed scroll 12, and a liquid injection passage is formed in these members 80, 95, and the liquid injection is formed there. Although the pipe 78 is connected in communication, the liquid injection pipe 78 is directly connected to the fixed scroll 12 as shown in FIG. 6, for example, without attaching such a member (attachment member 80 or intermediate member 95). It doesn't matter.

  In this case, the liquid injection pipe 78 is connected to a middle part of the pipe connecting the outlet side of the condenser of the refrigerant circuit and the pressure reducing device, or to a liquid receiving pipe provided between the condenser and the pressure reducing device. It can be configured by penetrating from one end in the up-down direction of the sealed container 2 (end cap 4A) of the scroll compressor 1 and inserted and connected to a liquid injection passage 92 communicating with the introduction holes 90, 91.

  In FIG. 6, the same reference numerals as those in FIGS. 1 to 5 have the same or similar effects or actions, and thus the description thereof is omitted here.

  Even in such a configuration, the liquid injection circuit 60 for introducing the liquid refrigerant can be simplified as in the above embodiments, and the liquid injection circuit 60 can be downsized. Is possible.

  In particular, in this embodiment, the liquid injection circuit 60 can be configured with an extremely simple configuration in which the liquid injection pipe 78 is directly connected to the liquid injection passage 92 communicating with the introduction holes 90 and 91. That is, since it is not necessary to attach a member (attachment member 80 or intermediate member 95) having a liquid injection passage to the other surface (upper surface) of the fixed scroll 12 as in the first and second embodiments, the number of parts is minimized. It becomes possible to suppress. As a result, the manufacturing cost can be more effectively reduced. Furthermore, since a space for attaching members such as the attachment member 80 and the intermediate member 95 to the upper surface of the fixed scroll 12 is not required, the scroll compressor can be further downsized and the degree of freedom of the space in the sealed container 2 can be improved. It is also possible to plan.

DESCRIPTION OF SYMBOLS 1 Scroll compressor 2 Sealed container 4 Container body 4A End cap 4B Bottom cap 6 Oil reservoir 8 Terminal 10 Scroll compression element 12 Fixed scroll 12A End plate 12B Wrap 13 Recessed portion 14 Swing scroll 14A End plate 14B Wrap 16 Compression space 17 Discharge port 18 Suction port 19 Discharge hole 19V Discharge valve 20 Electric element 22 Rotating shaft 22A Eccentric part 23 Stator 24 Stator coil 25 Rotor 42 Discharge chamber 43 Electric element chamber 50 Discharge pipe 51 Suction pipe 60 Liquid injection circuit 70, 71 Introducing hole 74 Liquid injection passage 78 Liquid injection piping 80 Mounting member 82 Communication passage 83, 84 Passage 90, 91 Introduction hole 92 Liquid injection passage 94 Second liquid injection passage 9 , 97 passage

Claims (6)

A scroll compression element and an electric element for driving the scroll compression element are provided in the hermetic container, and the scroll compression element is provided with a fixed scroll having a spiral wrap standing on one surface of the end plate, and the fixed A plurality of orbiting scrolls, which are pivoted by the rotating shaft of the electric element with respect to the scroll and have a spiral wrap standing on one side of the end plate, and are formed by meshing the wraps with each other. In the scroll compressor that compresses the refrigerant by gradually reducing the compression space from the outside toward the inside,
The winding angle of the fixed scroll wrap is set to be 180 ° larger than the winding angle of the swing scroll wrap,
A scroll compressor characterized in that an introduction hole of a liquid injection circuit for introducing liquid refrigerant is opened in the fixed scroll at a position corresponding to the compression chamber of intermediate pressure of the scroll compression element. A scroll compression element and an electric element for driving the scroll compression element are provided in the hermetic container, and the scroll compression element is provided with a fixed scroll having a spiral wrap standing on one surface of the end plate, and the fixed A plurality of orbiting scrolls, which are pivoted by the rotating shaft of the electric element with respect to the scroll and have a spiral wrap standing on one side of the end plate, and are formed by meshing the wraps with each other. In the scroll compressor that compresses the refrigerant by gradually reducing the compression space from the outside toward the inside,
The winding angle of the fixed scroll wrap is set to be 180 ° larger than the winding angle of the swing scroll wrap,
A scroll compressor characterized in that introduction holes of a liquid injection circuit for introducing a liquid refrigerant are respectively opened on both sides of a lap of the fixed scroll at a position not communicating with the discharge hole of the fixed scroll.   The liquid injection passage which is formed in the fixed scroll and communicates with the introduction hole is provided, and a liquid injection pipe constituting the liquid injection circuit is directly connected to the liquid injection passage. 2. The scroll compressor according to 2.   The scroll compressor according to claim 1 or 2, wherein a pin member for narrowing the passage is provided in a liquid injection passage communicating with the introduction hole.   The introduction hole passes through the fixed scroll, an attachment member having a liquid injection passage communicating with the introduction hole is attached to the fixed scroll, and a liquid injection pipe constituting the liquid injection circuit is attached to the attachment member. The scroll compressor according to claim 1 or 2, wherein the scroll compressor is attached and connected to the liquid injection passage.   An intermediate member that is attached to the fixed scroll and has a second liquid injection passage that communicates the liquid injection pipe with the liquid injection passage in the fixed scroll, and the fixed scroll, or between the mounting member and the fixed scroll. The scroll compressor according to any one of claims 4 to 5, wherein a seal member is provided outside the liquid injection passage.

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