JPS627992A - Rotary compressor - Google Patents

Abstract

PURPOSE:To soften the connection shock of a clutch on start by operating the clutch set between a shaft and a rotor by the discharge pressure of an oil pump installed onto the shaft. CONSTITUTION:A cylinder 27 is installed onto the rotor shaft 31 of a rotary compressor, and a plurality of friction plates 26 are installed in the longitudinal direction inside the cylinder 27. The friction plates 25 alternately arranged to the friction plates 26 and an oil plate 22 for receiving oil pressure are installed onto the shaft 11 of the rotary compressor. When the shaft 11 and the rotor shaft 31 are connected by allowing the discharge oil pressure of a trochoid pump 13 installed onto the shaft 11 to act onto the oil plate 22, the discharge pressure of the trochoid pump 13 on start is lowered, and the engagement force between the friction plates 25 and 26 reduces, and the start of the rotary compressor can be carried out smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary compressor, and is effective for use as a compressor for, for example, a refrigeration cycle.

[Conventional technology]

Conventionally, when a rotary compressor such as a vane type compressor or a swash plate type compressor is used as a refrigeration cycle compressor mounted on an automobile, the engine driving force of the compressor is connected and released by an electromagnetic clutch. However, when the electromagnetic clutch is turned on and off, a sudden load change occurs on the engine, which impairs dryness.

[Problem that the invention seeks to solve]

The present invention has been made in view of the above points, and an object of the present invention is to combine a rotary compressor and a pressure multi-disc clutch, gradually engage the pressure multi-disc clutch, and reduce the coupling shock when the compressor starts rotating. In addition, the object is to downsize the clutch and the pressure source for actuating the clutch.

[Means for solving problems]

As a means for solving the above problems, in a rotary compressor having a rotor member that changes the volume of a compression chamber by rotation, a shaft is provided with friction plates slidable in the longitudinal direction of the shaft, and the friction plates alternate with each other. a clutch cylinder which is provided with a friction plate arranged to be slidable in the longitudinal direction of the shaft and is integrally connected to the rotor member; a spring member which separates the friction plate in the longitudinal direction of the shaft; and a spring member which presses the friction plate. A relatch oil plate that is slidable in the longitudinal direction of the shaft to connect the clutch, an oil pressure chamber that includes the clutch oil plate as a part of the chamber wall, and a hydraulic oil that is slidable on the clutch oil plate. an oil pump that rotates together with the shaft for supplying oil to the oil pressure chamber; a first solenoid valve that is interposed in a flow path that communicates the suction side and the discharge side of the oil pump; A relatching fluid plate that is slidable in the axial direction so as to press against the clutch oil plate; a fluid pressure chamber that includes the clutch fluid plate as a part of the chamber wall; and a high-pressure fluid pressure obtained by the rotary compressor. The fluid pressure chamber is characterized by comprising a communication path leading into the fluid pressure chamber, and a second solenoid valve interposed in the flow path that connects the communication path to the low pressure chamber.

[Effect]

According to the above configuration, when the rotary compressor is started, the oil discharged from the oil pump is supplied to the oil pressure chamber, and the clutch oil plate 1 is slid to press the friction plate between the shaft and the rotor. After the members are connected and started, high-pressure fluid from the rotary compressor is supplied to the fluid pressure chamber through the communication path, and the clutch fluid plate is slid toward the clutch oil plate 1 to reduce the friction. Press the board to connect.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, its basic structure consists of a rotary compressor P and a pressure-type multi-disc clutch R connected by hydraulic pressure and refrigerant pressure.

First, the configuration of the pressure type multi-disc clutch R will be mainly explained.

A shaft 11 rotatably supported by a bearing 10 is integrally connected with a pulley 12 by a spline, and this pulley 12 is rotatably supported by a hair ring 80 and is connected from an engine (not shown) via a V-belt. be rotated.

The shaft 11 has a
.

A known trochoid pump 13 with a relatively small discharge volume is provided. As shown in FIG. 2, this pump 13 has an inner rotor 14 and an outer rotor 1 that rotate together with the shaft 11.
5, and by rotating counterclockwise in FIG. After being sucked in through 17, it is discharged into the discharge path 18 to perform a pumping action. The suction pipe 17 of the trochoid pump 13 communicates with a suction cut surface 62 formed on the housing plate 61 as shown in FIG.
The discharge side thereof communicates with a discharge face 63 of the housing plate 61 and also with an annular groove 64 provided on the outer periphery of the shaft 11 .

Further, as shown in FIG. 2, the discharge passage 18 communicates with a discharge oil chamber 60, and as shown in FIG. ) 65 and 66 are connected to the oil reservoir 16 via an oil passage (not shown), and the oil of the boat 65 and 66 is
ff! A solenoid valve 67, which will be described later, is provided in the middle of the oil path. When the electromagnetic valve 67 is energized, the oil passage of the port 1-65.66 is closed, and when it is not energized, the discharge oil sucked from the oil reservoir 16 and discharged by the toroid pump 13 is Discharge face 63. Discharge path 18. Discharge oil path 60. Beau) 6
Return to the oil reservoir chamber 16 via 5.66.

In FIG. 1, reference numerals 81 and 82 indicate oil seals of the shaft 11.

A clutch oil cylinder 20 (hereinafter abbreviated as oil cylinder) is integrally fixed to the shaft 11 by shrink fitting or the like. The shaft 1 is inside the oil cylinder 20.
1 (hereinafter referred to as the axial longitudinal direction),
Further, an annular clutch oil plate 22 (hereinafter abbreviated as oil plate) is provided on the rear surface of the clutch oil plate 22 to form an oil pressure chamber 21 in an oil-tight manner. The oil pressure chamber 21 includes an oil passage 23 formed in the shaft 11 and an oil passage 24 formed on the shaft 11 side of the oil cylinder 20.
via the discharge face 63. of the toroid pump 13. It communicates with the annular groove 64. Note that sealing O-rings are provided on the inner and outer peripheries of the oil plate 22. The oil reservoir chamber 16 also communicates with the oil chamber 83.

A plurality of friction plates (inner plates) 25 are provided on the right side of the oil plate 22 and fit into splines formed on the shaft 11, and the inner plates 25 rotate together with the shaft 11 and rotate along the longitudinal axis of the shaft. It is possible to slide in the direction. A plurality of friction plates (outer plates) 26 arranged alternately with the inner plates 25 rotate together with the clutch refrigerant cylinder 27 (hereinafter referred to as the refrigerant cylinder) as shown in FIG. 4, and rotate in the longitudinal direction of the shaft. It is slidably provided. Refrigerant cylinder 27
is integrally connected to the rotor shaft 31 of the rotary compressor P. Moreover, a corrugated plate spring 28 is provided between each inner plate 25 on the outer periphery of the shaft 11 so as to push the inner plate 25 and the outer plate 26 apart.

A clutch refrigerant plate 30 is provided inside the refrigerant cylinder 27 so as to be slidable in the longitudinal direction of the shaft and to form a refrigerant pressure chamber 29 airtightly on the back surface thereof. Note that O-rings for sealing are provided on the inner and outer peripheries of the refrigerant plate 30. The refrigerant pressure chamber 29 is connected to the refrigerant cylinder 27
It communicates with the high-pressure compression chamber of the rotary compressor P via a refrigerant path 32 formed in the rotor shaft 31 and a refrigerant path 33 formed in the axial longitudinal direction of the rotor shaft 31 .

Next, rotational compression mP will be explained.

The compressor P has a housing 34. Front plate 35.
Rear plate 362 Cylinder 37 having a cylindrical cylinder inner surface. and a rotor 39 that accommodates the plate vane 38, etc., and the suction hole 40 (shown in FIG. 6) formed in the front plate 35 by the rotation of the rotor 39.
The refrigerant is sucked in from the discharge hole 41 of the cylinder 37 through a discharge valve (not shown) and a discharge chamber 42 . The refrigerant is then discharged to a refrigeration cycle (not shown) through an oil separator 43 that separates hydraulic oil contained in the refrigerant. Note that the suction hole 40 is connected to a space 44 (low pressure chamber) in which the clutch is housed, and sucks refrigerant from this low pressure chamber 44 .

As shown in FIG. 6, the front plate 35 is equipped with a compressor P.
Three unloading boats 45 are provided to communicate the compression chamber M and the low pressure chamber 44, and unloading is carried out by moving a plunger 46 slidably housed in a hole perpendicular to these boats 45. Controls opening and opening of the boat 45. The movement of the plunger 46 is controlled by the balance between the refrigerant pressure in a control chamber 47 at its tip and the biasing force of a spring 48 at its other end.

The control room 47 has passages 49a and 49b.

49C to the compression chamber M in the middle of the compression stroke of the compressor P, and as shown in FIG.
It communicates with the low pressure chamber 44 via 51. Aisle 50.5
1, an 0N-OFF solenoid valve 52 is provided,
When ON, the control chamber 47 and low pressure chamber 44 are communicated,
When it is OFF, it is shut off, the refrigerant pressure in the control chamber 47 is controlled, and the position of the plunger 46 is arbitrarily changed and controlled.

On the other hand, the passage 49c communicating with the compression chamber M communicates with the refrigerant pressure chamber 29 via the passage 53 and the refrigerant passages 32 and 33, as described above. In other words, 0N-OF of the solenoid valve 52
The pressure in the refrigerant pressure chamber 29 as well as the control chamber 47 is controlled by F.

Next, the configuration of the electromagnetic valve 67 mentioned above will be briefly explained based on FIG. 7. The solenoid valve 67 is sealed by a sealing O-ring 70 and fixed to the housing by a stopper 71. The above-mentioned bows 65 and 66 communicate with the flow paths 72 and 73 of the solenoid valve 64, respectively. When the coil 74 is energized, the moving core 76 is attracted to the side core 77 against the coil spring 75, and the moving core 76 is attracted to the side core 77.
6 blocks communication between the channels 72 and 73.

When not energized, the notch 76a on the outer periphery of the moving core 76
Flow paths 72 and 73 communicate with each other via.

Further, the inner peripheral surface of the sleeve 78 has a groove 78a formed along the longitudinal direction of the moving core 76.
is the space 7 between the moving core 76 and the side core 77
9. and a flow path 72 (which communicates with the discharge side of the trochoid pump 13). Therefore, even if the coil 74 is energized and the moving core 76 is attracted by the side core 77, if the oil pressure discharged from the flow path 72 rises above a certain value, the moving core 76 will overcome the attraction force. and move to the upper left in the diagram. That is, when the oil pressure exceeds a certain value, the structure also serves as an oil relief valve that communicates with the flow passages 72 and 73, and in the above-mentioned embodiment, it is set to provide relief at a pressure of 10 kg/cnT.

Next, the operation will be explained based on the above configuration.

Engine driving force is transmitted to the shaft 11 and the trochoid pump 13 via the pulley 12. When the electromagnetic valve 67 is not energized, the hydraulic oil discharged from the trochoid pump 13 returns to the oil reservoir chamber 16 as described above.
Since the oil pressure chamber 21 is not supplied, the rotational force of the shaft 11 is not transmitted to the rotor shaft 31.

When you turn on the air conditioner (A/C) switch (not shown),
The electromagnetic valve 67 is energized, and the boat 62 communicating with the discharge oil chamber 6o and the port 63 communicating with the oil reservoir chamber 16 are shut off. Then, the discharge oil pressure from the trochoid pump 13 increases, and this pressure is applied to the oil passage 23 of the shaft 11. The oil is introduced into the oil pressure chamber 21 through the oil passage 24 of the oil cylinder 20, and the oil plate 22 is urged to the right in FIG. 1 and slides. Therefore, the inner plate 25 and the outer plate 2
6 is gradually pressed by this oil plate 22, and the inner plate 25 and outer plate 26 are connected by mutual frictional force,
The rotational force of the shaft 11 is transmitted to the rotor shaft 31 via the refrigerant cylinder 27.

When the rotor shaft 31 and rotor 39 begin to rotate,
The compressor P sucks refrigerant from the low pressure chamber 44 through the suction hole 40,
After compression, the discharge hole 41. Discharge chamber 42, oil separator 43
It is then discharged to the outside. At this time, since the solenoid valve 52 is in the OFF state, the refrigerant pressure in the compression chamber is applied to the front plate 35 through the passages 49a, 49b, and 49c shown in FIG.
The plunger 46 is controlled to close the unload port 45 and increase the discharge capacity.

On the other hand, the refrigerant pressure in the compression chamber is increased by the passage 53. Rotor shaft 3
1 refrigerant path 32. The refrigerant is led to the refrigerant pressure chamber 29 via the refrigerant passage 33 of the refrigerant cylinder 27 . Therefore, the refrigerant plate 30 is urged to the left in FIG.
The inner body 25 is further pressed to connect more firmly.

That is, when the compressor P is started, the inner plate 25 and the outer plate 26 are gradually connected by the hydraulic pressure of the trochoid pump 13, the rotational force of the shaft 11 is transmitted to the rotor shaft 31, and after the compressor P is started, the discharge is The outer body 26 and the inner plate are pressed together by the refrigerant to more firmly connect them.

In addition, even when the solenoid valve 52 is ON-OFF controlled to control the opening and closing of the unload port 45 by the plunger 46 according to the refrigerant load of the refrigeration cycle, the passage is 49C
An aperture is provided in the middle.

When the A/C switch is turned off, the electromagnetic valve 67 is de-energized, and the discharge oil pressure of the trochoid pump 13 is relieved to the oil reservoir chamber 16 and no longer acts on the oil pressure chamber 21. Furthermore, by opening the solenoid valve 52, the refrigerant pressure in the refrigerant pressure chamber 29 is reduced to
, 49c, and 51, the low pressure chamber 44 is relieved.

Therefore, the inner plate 25 and the outer plate 26 are separated by the biasing force of the corrugated plate spring 28, and the connection between them is severed, so that the shaft 11 and the rotor shaft 31 are disconnected.

In addition, the evaporator outlet air temperature of the refrigeration cycle is detected by a thermistor, and the clutch 0N-O is used to prevent frosting.
When performing FF, of course, the relatches are connected and released as described above.

Note that after the compressor P is started, the driving load of the trochoid pump 13 can be reduced to almost zero by turning off the solenoid valve 67 and not returning the discharged oil of the trochoid pump 13 to the oil reservoir chamber 16. Compared to the case where the oil discharged from the trochoid pump 13 is always supplied to the oil pressure chamber 21, the rotational drive load on the shaft 11 can be reduced.

In addition, when connecting a conventional rotary compressor and an electromagnetic clutch in combination, it is generally necessary to always supply electricity while the clutch is connected, but with the method described above, it is necessary to keep the compressor connected in order to maintain the clutch connection. It also has the advantage of not requiring any external input since it utilizes the high-pressure fluid pressure obtained from the system.

Further, in the above embodiment, the refrigerant pressure chamber 29 is controlled by the solenoid valve 52 that introduces high pressure fluid pressure from the compression chamber M of the compressor P and controls the pressure of the control chamber 47 of the variable displacement mechanism. A dedicated electromagnetic device may be provided to obtain high-pressure fluid pressure from the refrigerant pressure chamber 29 or to control only the pressure in the refrigerant pressure chamber 29.

In addition, although a vane type compressor was shown in the above embodiment,
It goes without saying that the present invention can be used in other types of compressors such as scroll type, wobble type, and rotasco type. Moreover, since the hydraulic oil of the trochoid pump 13 is similar to the lubricating oil in the refrigerant, the low pressure chamber 44 of the compressor P,
It is also possible to communicate the oil reservoir chamber 16 of the trochoid pump 13 and share the hydraulic oil.

〔Effect of the invention〕

As described above, when the rotary compressor is started, the oil discharged from the oil pump is supplied to the oil pressure chamber, the clutch oil plate is slid, and the friction plate is pressed to connect the shaft and the rotor. After startup, the high-pressure fluid obtained by the rotary compressor is supplied to the fluid pressure chamber through the communication path, and the clutch fluid plate slides toward the clutch oil plate to press the friction plate and press the shaft and rotor members together. Connecting. Therefore, after startup, the high-pressure fluid obtained by the compressor is used to connect the clutch, so the oil pump's discharge oil is required only at startup, so it is possible to use a small oil pump with a small discharge volume. This makes it possible to make the entire rotary compressor relatively compact. Furthermore, compared to an electromagnetic clutch, use of a multi-plate clutch allows clutch engagement to occur gradually, resulting in improved drivability.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a sectional view taken along the line ■-■ in FIG. Fig. 4 is a configuration diagram showing the structure of the friction plate, clutch refrigerant cylinder, etc., Fig. 5 is a cross-sectional view taken along line V-V in Fig. 1, and Fig. 6 is a cross-sectional view taken along line IV-IV in Fig. 1. 7 are cross-sectional views of the solenoid valve. R...Pressure type multi-disc clutch, P...Rotary compressor 2M
, -... compression chamber. 11... Shaft, 13... Trochoid pump, 1
6...Oil reservoir chamber, 19...Housing, 20...
・Clutch oil cylinder, 21...Oil pressure chamber. 22...Oil plate, 25...Friction plate (inner plate)
. 26... Friction plate (outer plate), 27... Clutch refrigerant cylinder, 28... Corrugated plate spring, 29... Refrigerant pressure chamber, 30... Refrigerant plate 31... Rotor shaft 37...・Cylinder, 38... Vane,
39... Rotor, 52... Solenoid valve, 67... Solenoid valve.

Claims (1)

[Claims] In a rotary compressor having a rotor member that changes the volume of a compression chamber by rotation, a shaft is provided with friction plates slidable in the longitudinal direction of the shaft, and friction plates arranged alternately with the friction plates are arranged in the longitudinal direction of the shaft. a clutch cylinder that is slidable and integrally connected to the rotor member; a spring member that separates the friction plate in the longitudinal direction of the shaft; and a spring member that slides in the longitudinal direction of the shaft so as to press the friction plate to connect the clutch. a movable clutch oil plate; an oil pressure chamber having the clutch oil plate as part of a chamber wall;
an oil pump that rotates integrally with the shaft for supplying hydraulic oil to the oil pressure chamber so as to slide on the clutch oil plate; and a flow path that communicates between the suction side and the discharge side of the oil pump. an intervening first solenoid valve, a relatching fluid plate slidable in the axial direction so as to press the friction plate toward the clutch oil plate, and a fluid pressure chamber having the clutch fluid plate as part of a chamber wall. A rotary compressor comprising: a communication path for introducing high-pressure fluid pressure obtained by the rotary compressor into the fluid pressure chamber; and a second electromagnetic valve interposed in a flow path that communicates the communication path with a low-pressure chamber. .