JPH0441274Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a variable capacity vane type rotary compressor used as a refrigerant compressor for, for example, an automobile air conditioner.

(Prior Art) Conventionally, as this type of variable capacity vane type rotary compressor, one shown in FIG. 4, for example, is known.

In FIG. 4, reference numeral 1 denotes a control cylinder provided on the head cover 3 of the compressor 2, and the control cylinder 1 communicates with an atmospheric pressure introduction chamber 5 and a suction chamber 6 through a bellows 4, and is connected to the suction pressure of the compressor 2. is defined in the suction pressure introduction chamber 7 into which the pressure is introduced. The bellows 4 is deformed by the pressure difference between the atmospheric pressure in the atmospheric pressure introduction chamber 5 and the suction pressure in the suction pressure introduction chamber 7, and the deformation of the bellows 4 drives the control valve 8 and supplies control pressure to the actuator 9. be done. Actuator 9 operates in response to control pressure and rotates movable plate 10 . The rotational position of the movable plate 10 controls the bypass gas flow rate through which the compressed gas in the working chamber 11 of the compressor 2 bypasses the suction chamber 6 in the head cover 3. The discharge amount is controlled. A dustproof member 12, such as felt or sponge, is inserted into the open end of the atmospheric pressure introduction chamber 5 on the atmosphere side to prevent dust from entering the introduced atmosphere so as not to interfere with the operation of the bellows 4. There is.

On the other hand, reference numeral 13 denotes an absorbent member provided on the head cover 3, such as felt or sponge. The absorbent member 13 is formed in a cylindrical shape and is fitted into the through portion of the head cover 3 of the rotor shaft 14. When the lubricating oil in the compressor 2 leaks from the shaft sealing device 15 installed between the rotor shaft 14 and the head cover 3, the leaked lubricating oil is absorbed by the absorbing member 13, and the leaked lubricating oil is transferred to the compressor. 2 to prevent it from dripping onto the outside.

(Problems to be solved by the invention) However, in such a conventional variable capacity vane type rotary compressor, an absorbing member 13 is provided near the oil leaking part of the compressor 2 to absorb leaked oil, and Since the atmospheric pressure introduction chamber 5 is equipped with a dustproof member to prevent dust from entering the introduced atmosphere, the same type of dedicated absorbing member and dustproof member are required for the oil leak part and the atmospheric pressure introduction chamber, respectively. was. As a result, the number of parts in the compressor increases,
In addition, since a dedicated space is required to install the absorbing member and dustproof member in the compressor, the number of man-hours required to create the compressor increases due to the processing of the dedicated space, which increases the manufacturing cost of the compressor. The point was hot.

(Purpose of the invention) Therefore, the present invention provides an introduction passage that communicates the vicinity of the oil leakage part of the compressor with the atmospheric pressure introduction chamber, and absorbs the leaked oil into the dustproof member of the atmospheric pressure introduction chamber. The purpose is to reduce the number of compressor parts and manufacturing man-hours, and reduce the manufacturing cost of the compressor, by having a single component absorb leaked oil and prevent dust from the introduced atmosphere.

(Means for solving the problem) In order to achieve the above-mentioned purpose, the variable capacity vane type rotary compressor according to the present invention is a movable rotary compressor that bypasses the compressed gas of the compressor to the suction side and changes the flow rate of the compressed gas discharged. A plate, an actuator that rotates the movable plate, a control valve that supplies control pressure to the actuator to operate the actuator, and is installed below the oil leakage part of the compressor and introduces atmospheric pressure through a partition member. a control cylinder defined by a chamber and a suction pressure introduction chamber, which introduces atmospheric pressure into the atmospheric pressure introduction chamber and introduces the suction pressure of the compressor into the suction pressure introduction chamber, and controls the difference between the atmospheric pressure and the suction pressure. In a variable capacity vane type rotary compressor that changes the discharge amount of the compressor by deforming a partition member with pressure and driving a control valve, the compressor is fitted into the atmospheric pressure introduction side of the atmospheric pressure introduction chamber. , a dust-proof member is provided to prevent the intrusion of dust in the introduced atmosphere and absorb oil leaking from the compressor, and an introduction passage that communicates with the atmospheric pressure introduction chamber from the vicinity of the oil leakage part of the compressor. The leaked oil is absorbed by the dustproof member.

(Function) In the present invention, an introduction passage is provided that communicates the vicinity of the oil leakage part of the compressor with the atmospheric pressure introduction chamber, so that the leaked oil is absorbed by the dustproof member of the atmospheric pressure introduction chamber, and the dustproof member of the atmospheric pressure introduction chamber is isolated. The system absorbs leaked oil and protects the incoming atmosphere from dust. Furthermore, since the number of parts and the number of manufacturing steps for the compressor are reduced, the manufacturing cost of the compressor is reduced.

(Example) Hereinafter, the present invention will be explained based on the drawings.

1 to 3 are diagrams showing an embodiment of the present invention. First, the configuration will be explained. In Figure 1, 2
Reference numeral 1 denotes a cylindrical cam ring provided in the compressor 20, and a cam surface 21a having a substantially elliptical cross section is formed on the inner periphery. A front plate 22 and a rear plate 23 are attached to both open ends of the front side (left side in the figure) and rear side (right side in the figure) of the cam ring 21, and seal the openings of the cam ring 21, respectively. A cylindrical rotor 24 is rotatably housed in a cam ring 21 between the front plate 22 and the rear plate 23 via a front shaft portion 24a and a rear shaft portion 24b, and the rotor 24 has a plurality of vanes 25 at its tip. cam surface 2
It is inserted and retractably inserted so as to be in sliding contact with 1a.
The cam ring 21, front plate 22, rear plate 23, rotor 24, and vane 25 are housed in a bottomed cylindrical housing 26, and the front open end (left side in the figure) of the housing 26 is sealed. A head cover 27 is attached.

28 is a suction chamber defined on the suction side of the compressor 20 by the front plate 22 and the head cover 27, and the suction chamber 28 introduces low-pressure refrigerant gas from an air conditioner (not shown) and supplies it to the working chamber 29. do. The working chamber 29 is defined by the cam ring 21, the front plate 22, the rear plate 23, and the rotor 24, and the refrigerant gas (compressor 20 (compressed gas) is discharged into the discharge chamber 30 via a discharge port (not shown). The discharge chamber 30 is defined on the rear side within the housing 26, and the lubricating oil that lubricates each part of the compressor is separated from the refrigerant gas discharged into the discharge chamber 30 by an oil separator (not shown). It is stored at the bottom of 30. The lubricating oil stored in the discharge chamber 30 flows from the discharge chamber 30 to the oil passage 23a formed in the rear plate 23 and the rear plate 23 due to the differential pressure between the suction pressure in the suction chamber 28 and the discharge pressure in the discharge chamber 30.
The pressure is reduced through an orifice 31 provided on the rear side of the compressor 20, and the compressor is supplied to each sliding part of the compressor 20. The lubricating oil lubricates each sliding part, is compressed together with the refrigerant gas in the working chamber 29, and is discharged again into the discharge chamber 30 and stored therein. An arc-shaped bypass port 32 that opens into the working chamber 29 is formed in the front plate 22, and the bypass port 32 connects the working chamber 29 to the suction chamber 2.
Connects to 8. Between the front plate 22 and the cam ring 21, a substantially disc-shaped movable plate 33 is connected to the rotor 2.
The movable plate 33 is provided rotatably around the axis of 4.
has a bypass opening 34 that changes the opening position of the front plate 22. When the movable plate 33 rotates, the opening position of the bypass port 32 changes, and the flow rate of the compressed refrigerant gas that bypasses from the working chamber 29 to the suction chamber 28 via the movable plate 33 changes, and the discharge amount of the compressor 20 changes. changes.

On the other hand, 35 is an actuator provided on the head cover 27. As shown in FIG. There is. A spring 38 is interposed between the head of the cylinder 37 (left side in FIG. 3) and the piston 36.
urges the piston 36 in the right direction in FIG. An arm portion 36b and an arm portion 36b connected to the piston 36 by a pin 36a.
The piston 36 is connected to the movable plate 33 via a pin 36c provided in the cylinder 37, and when the piston 36 slides within the cylinder 37, the movable plate 33 is rotated around the axis of the rotor 24. Control pressure is supplied from a control valve 40 to a cylinder chamber 39 defined by the piston 36 at the bottom of the cylinder 37 (on the right side in FIG. 3).
That is, the suction pressure or discharge pressure of the compressor 20 is supplied. The control valve 40 is provided in the lower part of FIG. 1, extending from the cam ring 21, the front plate 22, and the head cover 27, and includes a ball valve 41 that communicates with the discharge chamber 30, and a poppet valve 42 that faces the ball valve 41 and communicates with the suction chamber 28. configured. The ball valve 41 includes a ball valve body 43 , a ball valve seat 44 , and a coil spring 45 that is interposed within the ball valve 41 and biases the ball valve body 43 toward the ball valve seat 44 . The back portion of the discharge chamber 30 communicates with the discharge chamber 30 through a through hole 46 . Then, the poppet valve 42 is connected to the poppet valve body 4.
The ball valve 41 and poppet valve 42 are opened and closed by changes in a bellows 50 provided in a control cylinder 49, and control pressure is supplied to the cylinder chamber 39 of the actuator 35. The control cylinder 49 is provided below the front shaft portion 24a of the rotor 24 of the head cover 27, and the inside of the control cylinder 49 has a bellows 5.
0 (separation member) into an atmospheric pressure introduction chamber 51 and a suction pressure introduction chamber 52. The left end of the atmospheric pressure introduction chamber 51 in the drawing is open to the atmosphere, and the atmosphere is introduced into the atmospheric pressure introduction chamber 51. When the atmosphere is introduced into the atmospheric pressure introduction chamber 51, a disk-shaped dustproof member 53, For example, felt or sponge is inserted into the open end (atmospheric introduction side) of the atmospheric pressure introduction chamber 51. In addition, the suction pressure introduction chamber 52
communicates with the suction chamber 28, and the bellows 50 is moved in the axial direction of the control cylinder 49 by the differential pressure between the atmospheric pressure introduced from the atmospheric pressure introduction chamber 51 and the suction pressure introduced from the suction pressure introduction chamber 52. expands, contracts, deforms,
As described above, the poppet valve 42 of the control valve 40 and the control cylinder 49 are opened and closed, control pressure is supplied to the actuator 35 to operate the piston 36, and the movable plate 33 is rotated to adjust the discharge amount of the compressor 20. change.

On the other hand, a shaft sealing device 54 is installed between the front shaft portion 24a of the rotor 24 and the head cover 27.
The shaft sealing device 54 transfers refrigerant gas and lubricating oil to the compressor 2.
It is sealed inside 0. Also, head cover 2
7 is formed with an introduction passage 55 that communicates the vicinity of the shaft sealing device 54 (near the oil leakage part) of the head cover 27 with the atmospheric pressure introduction chamber 51. Oil is introduced into the atmospheric pressure introduction chamber 51 and absorbed by the dustproof member 53 of the atmospheric pressure introduction chamber. Note that since the atmospheric pressure introduction chamber 51 is provided below the front shaft portion 24a, that is, below the oil leakage portion, the leaked oil descends through the introduction passage 55 due to its own weight and is absorbed by the dustproof member 53. Ru.

Next, the effect will be explained.

In FIG. 1, the front shaft portion 2 of the rotor 24 is
4a is connected to a vehicle engine or the like and driven to rotate the rotor 24, the vanes 25 protrude in the radial direction due to centrifugal force and back pressure of the vanes 25, and their tips slide against the cam surface 21a of the cam ring 21. Rotate. Then, refrigerant gas is sucked into the working chamber 29 from the suction chamber 28 through a suction port (not shown), and the refrigerant gas is compressed in the working chamber 29 to become high pressure and high temperature, and then passes through the discharge chamber 30 to an air conditioner (not shown). supplied to the device. At this time, the control cylinder 49
The bellows 50 expands and contracts due to the atmospheric pressure in the atmospheric pressure introduction chamber 51 and the suction pressure in the suction pressure introduction chamber 52, and the ball valve 41 and poppet valve 42 open and close to supply control pressure to the cylinder chamber 39 of the actuator 35. be done. Then, the piston 36 is actuated, the movable plate 33 is rotated, and the discharge amount of the compressor 20 is variably controlled.

Meanwhile, while the compressor 20 is operating, the head cover 27
When the lubricating oil inside leaks from the shaft sealing device 54, the leaked oil is led to the atmospheric pressure introduction chamber 51 through the introduction passage 55 of the head cover 27, and is absorbed by the dustproof member 53 of the atmospheric pressure introduction chamber 51. , leaked oil will not drip to the outside of the compressor 20. In addition, since dust in the introduced atmosphere is prevented from entering the atmospheric pressure introduction chamber 51 by the dustproof member 53, the operation of the bellows 50 is not hindered, and the compressor 20
The discharge amount is smoothly controlled. In addition, the dustproof member 5
3 is removably installed in the atmospheric pressure introduction chamber 51, so it can be easily replaced depending on the state of leaked oil absorption, and the functions of leaked oil absorption and dust prevention will not be affected. .

In this way, in this embodiment, the compressor 20
An introduction passage 55 is provided that communicates the vicinity of the shaft sealing device 54 with the atmosphere introduction chamber 51, so that leaked oil from the compressor 20 is absorbed by the dustproof member 53 fitted into the open end of the atmospheric pressure introduction chamber 51, and the atmosphere is Dustproof member 53 of introduction chamber 51
Since it functions independently to absorb leaked oil and prevent dust from entering the atmosphere, the number of compressor parts and manufacturing man-hours can be reduced. As a result, the manufacturing cost of the compressor can be reduced. In this embodiment, the oil leakage portion has been described as being near the shaft sealing device 54, but the present invention is not limited to the shaft sealing device 54 and can be applied to other oil leakage portions.

(Effects) According to the present invention, an introduction passage is provided that communicates the vicinity of the oil leakage part of the compressor with the atmospheric pressure introduction chamber, and the leaked oil is absorbed into the dustproof member of the atmospheric pressure introduction chamber. Since the compressor independently absorbs leaked oil and prevents the introduced atmosphere from becoming dusty, the number of compressor parts and manufacturing man-hours can be reduced. Therefore, the manufacturing cost of the compressor can be reduced.

[Brief explanation of drawings]

1 to 3 are views showing an embodiment of a variable capacity vane type rotary compressor according to the present invention, in which FIG. 1 is a front sectional view, FIG. 2 is a cross sectional view, and FIG. 3 is a cross sectional view. 2 is a sectional view taken along the line 2, and FIG. 4 is a front sectional view showing a conventional variable capacity vane type rotary compressor. 20... Compressor, 33... Movable plate, 35... Actuator, 40... Control valve, 49... Control cylinder, 50... Bellows (separated member), 51...
...Atmospheric pressure introduction chamber, 52...Suction pressure introduction chamber, 53...
... Dustproof member, 54 ... Shaft sealing device (oil leakage part), 5
5...Introduction passage.

Claims (1)

[Scope of utility model registration request] a movable plate that bypasses the compressed gas of the compressor to the suction side and changes the flow rate of the compressed gas discharged;
An actuator that rotates the movable plate, a control valve that supplies control pressure to the actuator to operate the actuator, and is provided below the oil leakage part of the compressor, and is connected to the atmospheric pressure introduction chamber and the suction by a partition member. and a control cylinder defined in the pressure introduction chamber, which introduces atmospheric pressure into the atmospheric pressure introduction chamber and introduces the suction pressure of the compressor into the suction pressure introduction chamber, so that the pressure difference between the atmospheric pressure and the suction pressure is In a variable capacity vane type rotary compressor that changes the discharge amount of the compressor by deforming a partition member and driving a control valve, the compressor is inserted into the atmosphere introduction side of the atmospheric pressure introduction chamber, and the air is introduced into the compressor. A dust-proof member that prevents dust from entering inside and absorbs leaked oil from the compressor;
A variable capacity vane type rotary compressor, characterized in that an introduction passage communicating from the vicinity of an oil leakage part of the compressor to an atmospheric pressure introduction chamber is provided so that leaked oil from the compressor is absorbed by the dustproof member.