JP5842637B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor.

  Patent Documents 1 and 2 disclose conventional scroll compressors. This scroll compressor includes a housing, a fixed scroll, and a movable scroll. The fixed scroll has a fixed substrate fixed to the housing, and a spiral fixed spiral wall that is integral with the fixed substrate and protrudes in the axial direction from the fixed substrate. The movable scroll is accommodated in the housing so as to be capable of revolving only.

  The fixed scroll and the movable scroll mesh with each other to form a compression chamber. In this compression chamber, a volume change occurs when the movable scroll revolves with respect to the fixed scroll. More specifically, the compression chamber includes an outer compression chamber formed outside the fixed spiral wall and an inner compression chamber formed inside the fixed spiral wall in the initial stage of closing. The chamber is a single discharge compression chamber with a reduced volume.

  A suction chamber for storing low-pressure gas is formed in the housing, and low-pressure gas is sucked into the outer compression chamber and the inner compression chamber from a suction port communicating with the suction chamber. A discharge chamber for storing high-pressure gas is formed between the housing and the fixed substrate, and a discharge port communicating with the discharge chamber is provided through the fixed substrate. The discharge compression chamber discharges high-pressure gas to the discharge port. A discharge reed valve capable of opening and closing the discharge port is fixed to the fixed substrate.

  In addition, an injection port is formed in the fixed substrate, and a portion where an intermediate pressure gas exists in the external refrigeration circuit is connected to the injection port. For this reason, intermediate pressure gas is introduced into the outer compression chamber and the inner compression chamber from the injection port. Thereby, the efficiency of the refrigerating circuit using this scroll type compressor improves.

JP-A-8-144971 JP 2001-271768 A

  However, in the above conventional scroll compressor, when the injection reed valve is fixed to the fixed surface and the injection port is to be penetrated, it is necessary to secure a space for disposing the injection port. The port becomes longer. For this reason, there exists a possibility that compression efficiency may fall by a big dead space. Moreover, in this scroll compressor, it is easy to produce a restriction | limiting in the penetration position of an injection port. Furthermore, in this scroll compressor, it may be difficult to firmly fix the discharge reed valve to the fixed substrate with bolts or the like, in which case there is a concern about durability.

  The present invention has been made in view of the above-described conventional situation, and can exhibit excellent compression efficiency and durability, and can also set a penetration position of an injection port relatively freely. Providing is an issue to be solved.

The scroll compressor according to the present invention includes a housing, a fixed scroll fixed to the housing, and accommodated in the housing so as to be capable of revolving only. A compression chamber is formed between the fixed scroll and the fixed scroll. A movable scroll that causes a volume change in the compression chamber by revolving, a suction port that sucks low-pressure gas into the compression chamber, a discharge port that discharges high-pressure gas from the compression chamber, and a compression chamber With an injection port that can introduce intermediate pressure gas,
The fixed scroll includes a fixed substrate and a spiral fixed swirl wall integrally formed with the fixed substrate and projecting in an axial direction from the fixed substrate.
The fixed substrate has a compression surface from which the fixed spiral wall protrudes, and a fixed surface that forms the back side of the compression surface and forms a discharge chamber that stores the high-pressure gas together with the housing,
In the scroll type compressor, the discharge port and the injection port are formed on the fixed substrate, and a discharge reed valve capable of opening and closing the discharge port is fixed to the fixed surface.
The fixed surface is inclined with respect to the compression surface so that the discharge port side is thinner than the injection port side ,
The fixed substrate is provided with a valve chamber communicating with the injection port at a portion located between the compression surface and the fixed surface and being thickened by the inclination of the fixed surface. ,
Wherein the valve chamber, characterized in that said injection port that open injection valve is fixed.

  In the scroll compressor according to the present invention, since the fixed surface is inclined with respect to the compression surface so that the discharge port side is thinner than the injection port side, the discharge port can be shortened and the compression efficiency is improved by a small dead space. . Moreover, since the injection port has only to be provided through the thick portion of the fixed substrate, the through position can be set relatively freely. Furthermore, since the discharge reed valve can be firmly fixed to the fixed substrate with a bolt or the like at a position away from the discharge port, excellent durability is also exhibited.

  Therefore, the scroll type compressor of the present invention can exhibit excellent compression efficiency and durability, and can set the penetration position of the injection port relatively freely.

The fixed substrate, openable injection valve injection port that could be fixed. Since the injection valve only needs to be fixed to the thick portion of the fixed substrate, the fixing position can be set relatively freely.

Discharge port, the main discharge port, Ru obtained consists of a secondary discharge port formed through the outer peripheral side than the main discharge port. The sub discharge port prevents liquid compression. In this case, since the discharge reed valve is enlarged, the effect is greater.

In the housing, not preferable that the motor mechanism for driving the movable scroll is housed. This scroll compressor is suitable for use in heating a heat pump.

  The scroll type compressor of the present invention can exhibit excellent compression efficiency and durability, and can relatively freely set the penetration position of the injection port.

It is sectional drawing of the scroll compressor of an Example. It is a principal part expanded sectional view regarding the scroll compressor of an Example. It is a rear view of a fixed scroll according to the scroll compressor of the embodiment. It is a front view of a fixed scroll according to the scroll compressor of the embodiment. It is a block diagram of the heating refrigeration circuit using the scroll compressor of an Example. It is a block diagram of the heating refrigeration circuit using the scroll compressor of an Example.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the electric scroll compressor 1 of the embodiment includes a housing 10. The housing 10 includes a bottomed cylindrical front housing 11 whose rear end side is open, and a rear housing 12 that forms a lid and closes the rear end side of the front housing 11. In FIG. 1, the right side indicates the front and the left side indicates the rear. The same applies to FIG.

As shown in FIG. 1, a shaft support member 15 is provided in the front housing 11, and a fixed scroll 16 is provided behind the shaft support member 15. An annular plate 60 is interposed between the shaft support member 15 and the fixed scroll 16. The front housing 11 and the rear housing 12 are housed in a state in which the shaft support member 15, the plate 60, and the fixed scroll 16 are in contact with each other, and the rear end of the front housing 11 and the front end of the rear housing 12 are abutted with each other. These are fixed to each other by a plurality of bolts 13.

  The fixed scroll 16 is integrated with the fixed substrate 16a and the fixed substrate 16a, and is integrated with the spiral fixed spiral wall 16b projecting from the fixed substrate 16a in the axial direction, and the fixed substrate 16a. It consists of the outer peripheral wall 16c which covers 16b from the circumference.

  A movable scroll 22 is engaged with the fixed scroll 16. The movable scroll 22 includes a disk-shaped movable substrate 22a facing the fixed substrate 16a, and a spiral movable movable wall 22b that is integrated with the movable substrate 22a and protrudes from the movable substrate 22a in the rear axis direction. . A cylindrical boss 22c protrudes forward from the center of the front surface of the movable substrate 22a. A plurality of rotation prevention holes 14a are recessed in the outer peripheral area of the front surface of the movable substrate 22a. A rotation prevention ring 14b is fixed to each rotation prevention hole 14a.

  At the center of the inner surface of the front wall of the front housing 11, a cylindrical boss 11a projects rearward. On the other hand, a shaft hole 15 a is formed through the center of the shaft support member 15. On the rear surface of the shaft support member 15, a plurality of rotation prevention pins 14 c are provided so as to protrude rearward. Each rotation prevention pin 14c rolls in the rotation prevention ring 14b. The anti-rotation mechanism 14 is constituted by all the anti-rotation holes 14a, the anti-rotation rings 14b, and the anti-rotation pins 14c.

  A bearing device 25 is provided in the shaft hole 15a of the shaft support member 15, a bearing device 26 is provided in the boss 11a of the front housing 11, and a drive shaft 24 extending in the front-rear direction is rotatable in the bearing devices 25 and 26. It is supported. Further, a sealing material 30 for sealing is interposed between the shaft support member 15 and the drive shaft 24 by a circlip 31.

  A cylindrical eccentric pin 32 protrudes from the rear end of the drive shaft 24. The eccentric pin 32 is provided with a bush 33 with a balancer. A bearing device 34 is provided between the cylindrical portion of the bush 33 with balancer and the boss 22 c of the movable scroll 22.

  A compression chamber 38 is defined by the fixed substrate 16a, the fixed spiral wall 16b, the movable substrate 22a, and the movable spiral wall 22b. The compression chamber 38 changes in volume as the movable scroll 22 revolves with respect to the fixed scroll 16. More specifically, as shown in FIG. 4, the compression chamber 38 has an outer compression chamber 38a formed outside the fixed spiral wall 16b and an inner compression formed inside the fixed spiral wall 16b in the initial period of closing. The outer compression chamber 38a and the inner compression chamber 38b are made into a single discharge compression chamber 38c while reducing the volume.

  Further, as shown in FIG. 1, a suction chamber 42 for storing a low-pressure refrigerant gas is formed in the front housing 11 in front of the shaft support member 15. A stator 44 is fixed to the inner peripheral surface of the front housing 11 in the suction chamber 42. A rotor 45 fixed to the drive shaft 24 is provided inside the stator 44. The rotor 45, the stator 44, and the drive shaft 24 constitute a motor mechanism 40.

  A suction port 43 that guides the refrigerant in the suction chamber 42 to the outer compression chamber 38a and the inner compression chamber 38b is formed in the rear end side of the inner peripheral surface of the front housing 11. Further, a suction port 46 through which the outside communicates with the suction chamber 42 is provided through the front end side of the outer peripheral wall of the front housing 11.

  A cylindrical boss 16d protrudes rearward from the center of the rear surface of the fixed substrate 16a of the fixed scroll 16. An O-ring 48 is provided between the tip of the boss 16d and the rear housing 12, and a discharge chamber 47 for storing high-pressure refrigerant gas is formed between the boss 16d and the rear housing 12. As shown in FIGS. 3 and 4, a main discharge port 49 a and a pair of sub discharge ports 49 b and 49 c are provided in the center of the fixed substrate 16 a in the axial direction. The sub discharge ports 49b and 49c are located on the outer peripheral side of the main discharge port 49a. The discharge compression chamber 38c and the discharge chamber 47 communicate with each other through the main discharge port 49a and the sub discharge ports 49b and 49c. The sub discharge ports 49b and 49c prevent liquid compression.

  As shown in FIG. 2, the fixed substrate 16 a has a compression surface 51 a from which the fixed spiral wall 16 b protrudes, and a fixed surface 51 b that forms the discharge chamber 47 together with the rear housing 12 and forms the back side of the compression surface 51 a. Yes. The fixed surface 51b is inclined with respect to the compression surface 51a so that the main discharge port 49a and the sub discharge ports 49b and 49c are thinner than the injection port 52a described later.

  A discharge reed valve 55 that can open and close the main discharge port 49a and the sub discharge ports 49b and 49c and a retainer 56 that regulates the opening degree of the discharge reed valve 55 are fixed to the fixed surface 51b by bolts 57.

  Further, as shown in FIG. 4, a pair of injection ports 52a and 52b are recessed in the axial direction on the compression surface 51a of the fixed substrate 16a. The injection port 52a is in communication with the outer compression chamber 38a, and the injection port 52b is in communication with the inner compression chamber 38b.

  As shown in FIG. 2, the valve chambers 53, 54 communicating with the injection ports 52a, 52b are formed in the axial direction in the portion where the fixed substrate 51a is thick due to the inclination of the fixed surface 51b. It is inclined and recessed. A check valve 61 that prevents backflow from the injection port 52a is housed in the valve chamber 53. A similar check valve 62 is accommodated in the valve chamber 54 shown in FIGS. The check valves 61 and 62 are injection valves.

  The rear housing 12 is provided with a discharge port 58 having one end communicating with the discharge chamber 47 and the other end opened above the outer peripheral surface of the rear housing 12.

  As shown in FIGS. 5 and 6, a pipe 63 is connected to the suction port 46, and a pipe 64 is connected to the discharge port 58. The pipe 63 is connected to the first inlet 65 a of the switching valve 65, and the pipe 64 is connected to the second inlet 65 b of the switching valve 65. A first outlet 65c and a second outlet 65d are formed in the switching valve 65, a pipe 66 is connected to the first outlet 65c, and a pipe 67 is connected to the second outlet 65d.

  The pipe 66 is provided with a first heat exchanger 71, an expansion valve 72, and a receiver 73. The first heat exchanger 71 can exchange heat with air outside the vehicle. A pipe 68 is connected to the bottom of the receiver 73, and a second heat exchanger 74 is provided between the pipe 68 and the pipe 67. The second heat exchanger 74 can exchange heat with the air in the vehicle by the blower 75. A pipe 69 is connected to the upper part of the receiver 73. The pipe 69 branches into branch pipes 69 a and 69 b, the branch pipe 69 a is connected to the check valve 61, and the branch pipe 69 b is connected to the check valve 62.

  These pipes 63, 64, 66, 67, 68, 69, the switching valve 65, the electric scroll compressor 1, the first heat exchanger 71, the expansion valve 72, the receiver 73, and the second heat exchanger 74 circulate the refrigerant. A heating refrigeration circuit is configured. This heating / refrigeration circuit is employed as an air conditioner for vehicles.

  In this air conditioner, the motor mechanism 40 of the electric scroll compressor 1 shown in FIG. Thereby, the drive shaft 24 is rotationally driven, and the movable scroll 22 revolves around the drive shaft 24 in cooperation with the eccentric pin 32, the balancer-equipped bush 33, the bearing device 34, and the rotation prevention mechanism 14. For this reason, the compression chamber 38 gradually reduces its volume.

  At this time, as shown in FIG. 5, if the switching valve 65 communicates the second inlet 65b and the first outlet 65c and communicates the first inlet 65a and the second outlet 65d, 2 The heat exchanger 74 functions as an evaporator, and the passenger compartment is cooled. The first heat exchanger 71 functions as a condenser and releases the heat of the refrigerant outside the vehicle.

  On the other hand, as shown in FIG. 6, if the switching valve 65 communicates the first inlet 65a and the first outlet 65c and communicates the second inlet 65b and the second outlet 65d, the second The heat exchanger 74 functions as a condenser, and the vehicle interior is heated. In addition, the 1st heat exchanger 71 functions as an evaporator, and discharge | releases the cold heat of a refrigerant | coolant outside a vehicle.

  During this time, intermediate pressure refrigerant gas is introduced into the outer compression chamber 38a and the inner compression chamber 38b through the pipe 69, the check valves 61 and 62, and the injection ports 52a and 52b. Thereby, the efficiency of a heating refrigeration circuit improves.

  Further, in the electric scroll compressor 1, as shown in FIGS. 2 and 3, the fixed surface 51b has a compression surface 51a so that the main discharge port 49a and the sub discharge ports 49b and 49c are thinner than the injection port 52a. Therefore, the main discharge port 49a and the sub discharge ports 49b and 49c are shortened. For this reason, compression efficiency improves with a small dead space.

  In the electric scroll compressor 1, the injection ports 52a and 52b may be provided through the thick portion of the fixed substrate 16a, and the check valves 61 and 62 can be fixed. For this reason, the penetration position of the injection ports 52a and 52b and the fixed position of the check valves 61 and 62 can be set relatively freely.

  Further, in the electric scroll compressor 1, the large discharge reed valve 55 can be firmly fixed to the fixed substrate 16a by the bolt 57 at a position away from the main discharge port 49a and the sub discharge ports 49b and 49c. High durability.

  Therefore, the electric scroll compressor 1 can exhibit excellent compression efficiency and durability, and can set the penetration positions of the injection ports 52a and 52b relatively freely.

  While the present invention has been described with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be appropriately modified and applied without departing from the spirit thereof.

  The present invention is applicable to a refrigeration circuit, a heating circuit, a heating refrigeration circuit, and the like.

DESCRIPTION OF SYMBOLS 10 ... Housing 16 ... Fixed scroll 38 ... Compression chamber 22 ... Movable scroll 43 ... Suction port 49a, 49b, 49c ... Discharge port (49a ... Main discharge port, 49b, 49c ... Sub discharge port)
52a, 52b ... injection port 16a ... fixed substrate 16b ... fixed spiral wall 51a ... compression surface 57 ... discharge chamber 51b ... fixed surface 55 ... discharge reed valve 61, 62 ... check valve (injection valve)
40 ... Motor mechanism

Claims (3)

A housing, a fixed scroll fixed to the housing, and accommodated in the housing so as to be able to revolve only. A compression chamber is formed between the fixed scroll and the compression by revolving with respect to the fixed scroll. A movable scroll for causing a volume change in the chamber, a suction port for sucking low-pressure gas into the compression chamber, a discharge port for discharging high-pressure gas from the compression chamber, and an injection port capable of introducing intermediate pressure gas into the compression chamber And
The fixed scroll includes a fixed substrate and a spiral fixed swirl wall integrally formed with the fixed substrate and projecting in an axial direction from the fixed substrate.
The fixed substrate has a compression surface from which the fixed spiral wall protrudes, and a fixed surface that forms the back side of the compression surface and forms a discharge chamber that stores the high-pressure gas together with the housing,
In the scroll type compressor, the discharge port and the injection port are formed on the fixed substrate, and a discharge reed valve capable of opening and closing the discharge port is fixed to the fixed surface.
The fixed surface is inclined with respect to the compression surface so that the discharge port side is thinner than the injection port side ,
The fixed substrate is provided with a valve chamber communicating with the injection port at a portion located between the compression surface and the fixed surface and being thickened by the inclination of the fixed surface. ,
A scroll compressor , wherein an injection valve capable of opening and closing the injection port is fixed in the valve chamber . The discharge port, the main discharge port and, according to claim 1 Symbol placement scroll compressor comprising a secondary discharge port formed through the outer peripheral side than the main discharge ports. The scroll compressor according to claim 1 or 2 , wherein a motor mechanism for driving the movable scroll is housed in the housing.

Images