JP2003247486A - Lubrication structure of piston compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve lubrication property of a shaft-seal device in a piston compressor equipped with a rotary valve. <P>SOLUTION: In a rotation shaft 21, introduction paths 31, 32 and supply path 211 are formed. The path 211 communicates with a suction chamber 142. The introduction paths 31, 32 communicate with the supply path 211. In a cylinder block 11, 12, suction paths 33, 34 are formed respectively to allow the cylinder bores 27, 28 to communicate with shaft holes 111, 121. With rotation of the shaft 21, the introduction paths 31, 32 intermittently communicate with the suction paths 33, 34. A communication hole 212 is formed on the periphery of the shaft 21. The communication hole 212 allows the supply path 211 to communicate with a chamber 132 for housing the shaft-seal device 22. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores a piston in a plurality of cylinder bores arranged around a rotary shaft, and rotates the rotary shaft via a cam body integrated with the rotary shaft. And a rotary valve having an introduction passage for introducing a refrigerant from a suction pressure region into a compression chamber defined by the piston in the cylinder bore, and a peripheral surface of the rotary shaft from within the entire housing of the compressor. The present invention relates to a lubrication structure in a piston type compressor in which a shaft sealing device for preventing fluid leakage along the shaft is provided between the entire housing and the rotary shaft.

[0002]

2. Description of the Related Art A piston type compressor disclosed in Patent Document 1 employs a rotary valve for introducing a refrigerant into a cylinder bore. The double-headed piston is reciprocated by the rotation of the swash plate. In the fixed displacement type swash plate compressor using this double-headed piston, the rotary shaft itself is a rotary valve. The structure that opens and closes the intake port for introducing the refrigerant into the cylinder bore with a rotary valve is
The volumetric efficiency can be improved as compared with the structure in which the suction port for introducing the refrigerant into the cylinder bore is opened and closed by the flexibly deformable suction valve.

[0003]

[Patent Document 1] Japanese Patent Laid-Open No. 7-63165

[0004]

A shaft seal device is provided between the front housing and the rotary shaft. The shaft seal device prevents the refrigerant in the compressor from leaking to the outside of the compressor along the peripheral surface of the rotating shaft. The lubrication-needed portion in the compressor is lubricated by the lubricating oil that flows together with the refrigerant. The shaft sealing device deteriorates early if it does not receive appropriate oil lubrication, and the sealing performance deteriorates early. The compressor disclosed in Patent Document 1 does not take sufficient lubrication measures for the shaft seal device.

An object of the present invention is to improve the lubricity of a shaft seal device in a piston type compressor using a rotary valve.

[0006]

To this end, according to the present invention, a piston is housed in a plurality of cylinder bores arranged around a rotary shaft, and the rotary shaft is connected via a cam body integrated with the rotary shaft. A rotary valve having an introduction passage for interlocking rotation with the piston and introducing a refrigerant from a suction pressure region into a compression chamber defined by the piston in a cylinder bore; A piston type compressor provided with a shaft sealing device for preventing fluid leakage along a peripheral surface of the shaft is provided between the entire housing and the rotary shaft. It is housed in a housing chamber, a supply passage is formed in the rotation shaft so as to communicate with the suction pressure region, and an introduction passage of the rotary valve is communicated with the supply passage, and the supply passage and the storage passage are connected. A chamber provided with a lubrication passage for communicating.

A part of the refrigerant in the suction pressure region reaches the accommodation chamber via the lubrication passage. A part of the lubricating oil that flows together with the refrigerant reaching the storage chamber contributes to the lubrication of the shaft sealing device. According to a second aspect of the present invention, in the first aspect, the lubricating passage is configured by a communication hole formed in the peripheral surface of the rotary shaft so as to communicate with the supply passage and the storage chamber, and the supply passage. did.

The configuration in which the supply passage for sending the refrigerant to the introduction passage of the rotary valve is part of the lubrication passage is a simple construction for forming the lubrication passage. According to a third aspect of the present invention, in the second aspect, a discharge chamber that discharges the refrigerant from the compression chamber is provided around the storage chamber, and a connecting portion between the introduction passage of the rotary valve and the supply passage and the communication are provided. The hole and the connection portion of the supply passage are arranged close to each other.

With such a configuration of the close arrangement, the effect of cooling the shaft seal device is enhanced by promoting the inflow and outflow of the refrigerant between the accommodation chamber and the supply passage. In the invention of claim 4, in any one of claims 1 to 3, the suction pressure region is
It was a suction chamber in the entire housing that communicates with the external refrigerant circuit.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rotary valve is formed integrally with the rotary shaft. Such an integrated structure reduces the number of parts and simplifies the process of assembling the compressor.

According to the invention of claim 6, the piston is housed in a plurality of cylinder bores arranged around the rotary shaft, and the piston is rotated for rotation of the rotary shaft via a cam body integrated with the rotary shaft. A rotary valve having an introduction passage for introducing refrigerant from a suction pressure region into a compression chamber defined in the cylinder bore by the piston, and along the peripheral surface of the rotary shaft from within the entire housing of the compressor; In a piston type compressor in which a shaft sealing device for preventing fluid leakage is provided between the entire housing and the rotary shaft, the shaft sealing device is housed in a storage chamber, and a supply passage is provided in the rotary shaft. Is formed so as to communicate with the suction pressure region, the introduction passage of the rotary valve is communicated with the supply passage, the accommodation chamber is communicated with the supply passage, and the cam body is accommodated. The lubrication passage for communicating between the storage chamber and the cam chamber which is provided.

In a piston type compressor in which a piston is interlocked with a cam body which rotates integrally with a rotary shaft, there is a slight refrigerant leak from the cylinder bore to the cam chamber. This refrigerant leakage makes the pressure in the cam chamber slightly higher than the pressure in the suction pressure region. Since the supply passage communicating with the storage chamber communicates with the suction pressure region, the refrigerant in the cam chamber flows through the lubricating passage to the supply passage slightly lower than the pressure of the cam chamber. Therefore, a part of the lubricating oil flowing with the refrigerant flowing from the cam chamber to the supply passage via the lubricating passage contributes to lubrication of the shaft sealing device.

According to the invention of claim 7, in claim 6,
The cam chamber was formed in a cylinder provided with the cylinder bore, and the lubricating fluid passage was communicated with the cam chamber through the cylinder.

The refrigerant in the cam chamber goes to the supply passage through a lubricating passage provided so as to penetrate the cylinder,
A part of the lubricating oil that flows with the refrigerant contributes to the lubrication of the shaft sealing device.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment in which the present invention is embodied in a fixed displacement piston type compressor will be described below with reference to FIGS.
It will be described based on.

As shown in FIG. 1A, a front housing 13 and a rear housing 14 are joined to the pair of joined cylinder blocks 11 and 12. The cylinder blocks 11 and 12, the front housing 13 and the rear housing 14 are fastened together by a plurality of bolts 10 (five in the present embodiment as shown in FIGS. 2 and 3). The cylinder blocks 11 and 12, the front housing 13 and the rear housing 14 form the entire housing of the compressor. A discharge chamber 131 is formed in the front housing 13. A discharge chamber 141 and a suction chamber 142 are formed in the rear housing 14.

A valve plate 15, a valve forming plate 16 and a retainer forming plate 17 are interposed between the cylinder block 11 and the front housing 13.
A valve plate 18, a valve forming plate 19 and a retainer forming plate 20 are interposed between the cylinder block 12 and the rear housing 14. Valve plate 1
Discharge ports 151 and 181 are formed in the valves 5 and 18, and discharge valves 161 and 19 are formed in the valve forming plates 16 and 19.
1 is formed. The discharge valves 161, 191 open and close the discharge ports 151, 181. Retainers 171, 201 are formed on the retainer forming plates 17, 20. The retainers 171, 201 are discharge valves 161, 191.
Regulate the opening.

A rotary shaft 2 is attached to each of the cylinder blocks 11 and 12.
1 is rotatably supported. The rotary shaft 21 has shaft holes 111 and 121 penetrating the cylinder blocks 11 and 12.
Has been inserted into. The rotating shaft 21 has shaft holes 111 and 121.
It is directly supported by the cylinder blocks 11 and 12 via.

A lip seal type shaft sealing device 22 is interposed between the front housing 13 and the rotary shaft 21. The shaft sealing device 22 is housed in a housing chamber 132 formed in the front housing 13. The discharge chamber 131 on the front housing 13 side is provided around the accommodation chamber 132.

A swash plate 23 is fixed to the rotary shaft 21. The swash plate 23, which is a cam body, is a swash plate chamber 2 as a cam chamber.
It is housed in 4. A thrust bearing 25 is interposed between the end surface of the cylinder block 11 and the annular base portion 231 of the swash plate 23. A thrust bearing 26 is interposed between the end surface of the cylinder block 12 and the base 231 of the swash plate 23. Thrust bearing 25,2
6 regulates the position of the rotary shaft 21 in the direction of the axis 213 with the swash plate 23 interposed therebetween.

As shown in FIG. 2, the cylinder block 11
Is formed with a plurality of cylinder bores 27 arranged around the rotary shaft 21. As shown in FIG. 3, the cylinder block 12 is formed with a plurality of cylinder bores 28 arranged around the rotation shaft 21. Front and rear (front housing 13 side is front side, rear housing 1
4 is on the rear side) and the paired cylinder bores 27, 2
A double-headed piston 29 is accommodated in 8. The cylinder blocks 11 and 12 form a cylinder for the double-headed piston 29.

As shown in FIG. 1A, the rotational movement of the swash plate 23 that rotates integrally with the rotary shaft 21 is transmitted to the double-headed piston 29 via the shoe 30, and the double-headed piston 29 is transferred to the cylinder bores 27, 28. It reciprocates back and forth inside. The double-headed piston 29 has a compression chamber 27 in the cylinder bores 27 and 28.
1, 281 are divided.

Sealing peripheral surfaces 112 and 122 are formed on the inner peripheral surfaces of the shaft holes 111 and 121 through which the rotary shaft 21 passes.
The diameters of the seal peripheral surfaces 112 and 122 are the same as those of the shaft holes 111 and 121.
Is smaller than the diameter of the other inner peripheral surface of the rotary shaft 21.
Are directly supported by the cylinder blocks 11 and 12 via the seal peripheral surfaces 112 and 122.

A supply passage 211 is formed in the rotary shaft 21. The start end of the supply passage 211 is on the inner end surface of the rotary shaft 21 and opens into the suction chamber 142 in the rear housing 14. Introducing passages 31 and 32 are formed in the rotating shaft 21 so as to communicate with the supply passage 211.

As shown in FIG. 2, the cylinder block 11
A suction passage 33 is formed so as to connect the cylinder bore 27 and the shaft hole 111. Inlet 3 of the suction passage 33
The reference numeral 31 is open on the seal peripheral surface 112. As shown in FIG. 3, a suction passage 34 is formed in the cylinder block 12 so as to connect the cylinder bore 28 and the shaft hole 121. The inlet 341 of the suction passage 34 has a seal peripheral surface 1
It opens on 22. With the rotation of the rotating shaft 21, the outlets 311 and 321 of the introduction passages 31 and 32 are connected to the suction passage 3
It intermittently communicates with the inlets 331, 341 of 3, 34.

When the cylinder bore 27 is in the suction stroke state (that is, the stroke in which the double-headed piston 29 moves from the left side to the right side in FIG. 1A), the outlet 311 and the suction passage 3 are provided.
The entrance 331 of No. 3 communicates. When the cylinder bore 27 is in the suction stroke, the supply passage 21 of the rotary shaft 21
The refrigerant in No. 1 is sucked into the compression chamber 271 of the cylinder bore 27 via the introduction passage 31 and the suction passage 33.

When the cylinder bore 27 is in the discharge stroke state (that is, the stroke in which the double-headed piston 29 moves from the right side to the left side in FIG. 1A), the outlet 311 and the suction passage 3 are provided.
The communication with the inlet 331 of No. 3 is cut off. Cylinder bore 2
When 7 is in the state of the discharge stroke, the refrigerant in the compression chamber 271 is discharged from the discharge port 151 to the discharge chamber 131 by pushing the discharge valve 161 away. The refrigerant discharged into the discharge chamber 131 flows out to an external refrigerant circuit (not shown).

Lubricating oil is contained in the circuit consisting of the compressor and the external refrigerant circuit, and this lubricating oil flows together with the refrigerant. When the cylinder bore 28 is in the suction stroke state (that is, the stroke in which the double-headed piston 29 moves from the right side to the left side in FIG. 1A), the outlet 321 and the inlet 341 of the suction passage 34 communicate with each other. When the cylinder bore 28 is in the suction stroke, the refrigerant in the supply passage 211 of the rotary shaft 21 is sucked into the compression chamber 281 of the cylinder bore 28 via the introduction passage 32 and the suction passage 34.

When the cylinder bore 28 is in the discharge stroke state (that is, the stroke in which the double-headed piston 29 moves from the left side to the right side in FIG. 1A), the outlet 321 and the suction passage 3 are provided.
The communication with the fourth inlet 341 is cut off. Cylinder bore 2
When 8 is in the discharge stroke state, the refrigerant in the compression chamber 281 is discharged from the discharge port 181 to the discharge chamber 141 by pushing the discharge valve 191 away. The refrigerant discharged to the discharge chamber 141 flows out to the external refrigerant circuit. The refrigerant flowing out to the external refrigerant circuit returns to the suction chamber 142.

The portion of the rotary shaft 21 surrounded by the seal peripheral surfaces 112, 122 becomes the rotary valves 35, 36 integrally formed with the rotary shaft 21. 1 (a), (b)
As shown in FIG. 3, a communication hole 212 is formed in the peripheral surface of the rotary shaft 21. The communication hole 212 connects the storage chamber 132 that stores the shaft sealing device 22 and the supply passage 211. The communication hole 212 and the supply passage 211 form a lubrication passage 37 that connects the accommodation chamber 132 and the suction chamber 142, which is a suction pressure region.

The connecting portion 214 between the communication hole 212 and the supply passage 211 is arranged near the connecting portion 215 between the introduction passage 31 of the rotary valve 35 and the supply passage 211. The following effects are obtained in the first embodiment.

(1-1) Suction chamber 142 which is a suction pressure region
The refrigerant in the compression chambers 271, 281 of the cylinder bores 27, 28 in the suction stroke passes through the supply passage 211, the introduction passages 31, 32 and the suction passages 33, 34 in the rotary shaft 21.
Head to. Therefore, a part of the refrigerant in the suction chamber 142 is supplied to the lubricating passage 37 including the supply passage 211 and the communication hole 212.
To reach the storage chamber 132 via. A part of the lubricating oil that flows together with the refrigerant reaching the accommodation chamber 132 is part of the accommodation chamber 13
2 and contributes to lubrication of the shaft sealing device 22.

(1-2) The starting end of the supply passage 211 is on the end face of the rotary shaft 21, and the refrigerant in the suction chamber 142 is not subjected to the centrifugal action due to the rotation of the rotary shaft 21 and the supply passage 2
It flows into 11 smoothly. On the other hand, the communication hole 212 goes around the axis line 213 of the rotary shaft 21. Therefore, the liquid lubricating oil in the supply passage 211 easily flows into the storage chamber 132, but the liquid lubricating oil in the storage chamber 132 does not easily return to the supply passage 211. That is, the lubricating oil is likely to collect in the storage chamber 132. The structure in which the lubricating oil is easily stored in the storage chamber 132 is
This is advantageous in lubricating the shaft sealing device 22.

(1-3) The temperature of the refrigerant in the supply passage 211 communicating with the suction chamber 142 is low, and the refrigerant sent from the supply passage 211 to the housing chamber 132 takes heat from the shaft sealing device 22. However, if there is almost no inflow or outflow of the refrigerant between the accommodation chamber 132 and the supply passage 211, the shaft sealing device 22 cannot be cooled effectively. Generally, the shaft sealing device 22
A rubber material is used for the material, but the high temperature of the rubber material causes early thermal deterioration, and the sealing property deteriorates early.

The compression chamber 271 on the cylinder bore 27 side and the introduction passage 31 of the rotary valve 35 are connected to each other by the rotary valve 3
With the rotation of 5, they communicate intermittently. The intermittent communication between the compression chamber 271 and the introduction passage 31 brings about a regular fluctuation of the pressure in the vicinity of the connecting portion 215 between the introduction passage 31 and the supply passage 211. Communication hole 212 and supply passage 211
Since the connecting portion 214 for connecting with is connected to the connecting portion 215, the pressure in the vicinity of the connecting portion 214 between the communication hole 212 and the supply passage 211 also fluctuates regularly. Such pressure fluctuations in the vicinity of the connection portion 214 promote the inflow and outflow of the refrigerant between the accommodation chamber 132 and the supply passage 211. Therefore, the shaft seal device 22 is effectively cooled.

(1-4) Supply passage 211 for sending the refrigerant to the introduction passages 31, 32 of the rotary valves 35, 36
Is a part of the lubrication passage 37, and a new passage for the lubrication passage is substantially formed only with the communication hole 212. Therefore, the configuration in which the supply passage 211 for sending the refrigerant to the introduction passages 31, 32 of the rotary valves 35, 36 is a part of the lubrication passage 37 is a simple configuration for forming the lubrication passage 37.

(1-5) The rotary valve 3 is attached to the rotary shaft 21.
The configuration in which 5, 36 are integrally formed reduces the number of parts and simplifies the process of assembling the compressor. Next, a second embodiment shown in FIGS. 4 to 6 will be described. The same symbols are used for the same components as those in the first embodiment.

A rotary valve 39, 40 is attached to the rotary shaft 38.
Is fastened. The position of the rotary shaft 38 is restricted by the pair of thrust bearings 43 and 44 in the direction of the axis 381 of the rotary shaft 38. The introduction passages 41, 42 formed in the rotary valves 39, 40 communicate with the swash plate chamber 24. The outlets 411, 421 of the introduction passages 41, 42 and the inlets 331, 341 of the suction passages 33, 34 communicate intermittently with the rotation of the rotary valves 39, 40.

A supply passage 382 is formed in the rotary shaft 38. Supply holes 383 and 384 are formed on the peripheral surface of the rotary shaft 38 in the swash plate chamber 24 so as to communicate with the supply passage 382. The swash plate chamber 24 has the supply holes 383, 38.
4 and the supply passage 382 to communicate with the suction chamber 142. The refrigerant in the suction chamber 142 is sent to the swash plate chamber 24 via the supply passage 382 and the supply holes 383 and 384.
The refrigerant in the swash plate chamber 24 passes through the introduction passages 41, 42 and the suction passages 33, 34 and is in the intake stroke of the cylinder bore 2.
It is sucked into the compression chambers 271, 281 of 7, 28.

A communication hole 385 is provided on the peripheral surface of the rotary shaft 38 in the housing chamber 132 for housing the shaft sealing device 22.
It is formed so as to communicate with 82. Accommodation room 132
Communicates with the suction chamber 142 via a lubrication passage 45 including a communication hole 385 and a supply passage 382.

The lubricating passage 45 plays the same role as the lubricating passage 37 in the first embodiment. In the second embodiment, item (1-1) in the first embodiment,
The same effects as the items (1-2), (1-4) and (1-5) can be obtained.

Next, a third embodiment shown in FIGS. 7 and 8 will be described. The same symbols are used for the same components as those in the first embodiment. In the third embodiment, as shown in FIG. 7A, the cylinder block 11 and the valve plate 1
5, valve forming plate 16 and retainer forming plate 17
A lubrication flow path 46 is formed so as to penetrate therethrough. Figure 7
As shown in (b), only one lubrication flow path 46 is provided. As shown in FIG. 8, the lubrication flow path 46 passes between the pair of lower cylinder bores 27, 27. An inlet 461 of the lubricating flow passage 46 is open to the swash plate chamber 24 as a cam chamber, and an outlet 462 of the lubricating flow passage 46.
Open to the accommodation chamber 132. That is, the lubrication flow path 46 communicates the accommodation chamber 132 with the swash plate chamber 24.
Other configurations are the same as those in the first embodiment.

Next, the operation of the third embodiment will be described. When the cylinder bore 27 is in the suction stroke state, the outlet 311 communicates with the inlet 331 of the suction passage 33, and the refrigerant in the supply passage 211 of the rotary shaft 21 is introduced into the introduction passage 3.
1 and the suction passage 33, and is sucked into the compression chamber 271 of the cylinder bore 27. When the cylinder bore 27 is in the state of the discharge stroke, the communication between the outlet 311 and the inlet 331 of the suction passage 33 is cut off, and the refrigerant in the compression chamber 271 pushes the discharge valve 161 from the discharge port 151 and pushes it away from the discharge chamber 1.
It is discharged to 31.

When the cylinder bore 28 is in the suction stroke, the outlet 321 communicates with the inlet 341 of the suction passage 34, and the refrigerant in the supply passage 211 of the rotary shaft 21 passes through the introduction passage 32 and the suction passage 34. It is sucked into the compression chamber 281 of the cylinder bore 28. When the cylinder bore 28 is in the discharge stroke state, the communication between the outlet 321 and the inlet 341 of the suction passage 34 is blocked, and the refrigerant in the compression chamber 281 is discharged from the discharge port 181 to the discharge chamber 141 by pushing the discharge valve 191 away. It

The cylinder bore 27 in the discharge stroke,
The pressure (discharge pressure) of the refrigerant in the compression chambers 271, 281 in 28 corresponds to the lubrication flow path 46, the housing chamber 132, and the supply passage 2.
The pressure is higher than the pressure in the swash plate chamber 24 communicating with the suction chamber 142 via 11. Therefore, the refrigerant in the compression chambers 271, 281 in the cylinder bores 27, 28 in the state of the discharge stroke is cooled by the circumferential surface of the double-ended piston 29 and the cylinder bores 27, 28.
Slightly leaks into the swash plate chamber 24 from a slight gap between the swash plate chamber and the peripheral surface. Such a refrigerant leak causes the pressure in the swash plate chamber 24 to be slightly higher than the pressures in the supply passage 211 and the suction chamber 142, and causes a pressure difference between the supply passage 211 and the swash plate chamber 24. As a result, the refrigerant in the swash plate chamber 24 flows into the supply passage 211 via the lubrication flow path 46, the housing chamber 132 and the communication hole 212.

The following effects can be obtained in the third embodiment. (3-1) Lubrication flow path 46, housing chamber 132 and communication hole 2
Since a steady refrigerant flow is generated in 12, the lubricating oil flowing together with the refrigerant is sequentially sent from the swash plate chamber 24 to the storage chamber 132, and at the same time from the storage chamber 132 to the supply passage 211.
Go out to. A part of the lubricating oil sent from the swash plate chamber 24 to the housing chamber 132 via the lubricating flow path 46 contributes to the lubrication of the shaft sealing device 22.

(3-2) Lubrication flow path 46, accommodating chamber 132
Since the refrigerant flows through the communication hole 212 and the communication hole 212, the shaft sealing device 2
2 can be cooled. Storage chamber 132 and swash plate chamber 24
The structure in which the lubricating flow path 46 communicates with
This is more effective in further cooling the shaft sealing device 22 than in the case of the first embodiment in which 6 is omitted.

The temperature of the storage chamber 132 decreases as the passage cross-sectional area of the lubricating flow passage 46 increases, but the storage chamber 132 increases as the passage cross-sectional area of the lubricating flow passage 46 further increases. The temperature of 132 increases. It is considered that this is because the temperature of the refrigerant in the swash plate chamber 24 is higher than that in the suction chamber 142.

Therefore, the passage cross-sectional area of the lubrication flow path 46 may be determined by experiment or according to the capacity of the compressor (for example, the pressure difference between the swash plate chamber 24 and the suction chamber 142, the volume of the swash plate chamber 24, etc.). It is set based on calculation.

(3-3) The refrigerant in the compression chambers 271, 281 is compressed along the peripheral surface of the double-headed piston 29.
When it leaks into the swash plate chamber 24 whose pressure is lower than the pressure of m, the mist-like lubricating oil mixed with the gaseous refrigerant is separated from the refrigerant. Therefore, the lubricating oil is stored in the bottom of the swash plate chamber 24. The stored lubricating oil is scraped up by the rotation of the swash plate 23 to lubricate between the swash plate 23 and the shoes 30,
It is used for lubricating the thrust bearings 25 and 26. The swash plate chamber 24, which has plenty of lubricating oil, is suitable as a source of lubricating oil. Therefore, the configuration in which the accommodation chamber 132 and the swash plate chamber 24 communicate with each other through the lubrication flow path 46 is suitable for supplying a large amount of lubricating oil for lubricating the shaft sealing device 22 to the accommodation chamber 132.

(3-4) Compression chamber 2 on the cylinder bore 27 side
71 and the introduction passage 31 of the rotary valve 35 intermittently communicate with each other as the rotary valve 35 rotates. The intermittent communication between the compression chamber 271 and the introduction passage 31 is defined by the introduction passage 3
1 brings about an intermittent suction action in the vicinity of the connecting portion 215 between the No. 1 and the supply passage 211. Since the connecting portion 214 between the communication hole 212 and the supply passage 211 is arranged close to the connecting portion 215, the suction action in the vicinity of the connecting portion 215 is near the connecting portion 214 between the communication hole 212 and the supply passage 211. Spread to. Such a ripple of the suction action promotes the outflow of the refrigerant from the accommodation chamber 132 to the supply passage 211 through the communication hole 212. Therefore, the flow of the refrigerant from the swash plate chamber 24 through the lubrication flow path 46, the storage chamber 132, and the communication hole 212 is promoted. The configuration in which the communication hole 212 and the introduction passage 31 are arranged close to each other has a structure in which the lubrication flow path 46, the housing chamber 132, and the communication hole 2 are provided.
The flow of the refrigerant through 12 is promoted to lubricate the shaft sealing device 22 and enhance the effect of cooling the shaft sealing device 22.

Next, a fourth embodiment shown in FIGS. 9 and 10 will be described. The same symbols are used for the same components as those in the first embodiment. As shown in FIG. 9A, the lowest bolt 10 is a bolt hole 47 penetrating the cylinder blocks 11, 12, valve plates 15, 18, valve forming plates 16, 19 and retainer forming plates 17, 20.
Passed by A. As shown in FIG. 10, another bolt 1
0 is also passed through a similar bolt hole 47. There is a gap between the peripheral surface of the bolt 10 and the peripheral surfaces of the bolt holes 47, 47A. A shaft through hole 48 for passing the rotary shaft 21 through the valve plate 15, the valve forming plate 16, and the retainer forming plate 17 communicates with the housing chamber 132. These configurations are the same as those in the first embodiment.

On the end surface of the cylinder block 11, a plurality of grooves 113, 114, 115 [in the present embodiment, three grooves are formed as shown in FIG. 9 (b) and FIG. 10] are formed. As shown in FIG. 10, the grooves 113, 114, and 115 have bolt holes 47, 47A, 47B, and 4 below the rotary shaft 21.
It communicates with 7C. Groove 113 is the lowest bolt hole 4
7A, and the grooves 114 and 115 communicate with the other bolt holes 47B and 47C. Also, the grooves 113, 11
4, 115 communicate with the shaft through hole 48.

Shaft through hole 48, groove 113 and bolt hole 47
A configures a lubrication flow path 49A that connects the swash plate chamber 24 and the storage chamber 132. Similarly, the shaft through hole 48 and the groove 11
4 and the bolt hole 47B constitute a lubrication flow path 49B,
The shaft through hole 48, the groove 115 and the bolt hole 47C form a lubrication channel 49C. Lubrication channels 49A, 49B, 4
The bolt holes 47A, 47B, 47C which are a part of 9C are
It penetrates the cylinder (cylinder block 11). Other configurations are the same as those in the first embodiment.

As in the case of the third embodiment, the pressure in the swash plate chamber 24 becomes slightly higher than the pressures in the supply passage 211 and the suction chamber 142 due to the refrigerant leakage from the compression chambers 271, 281 and the supply passage 211. And a pressure difference is created between the swash plate chamber 24. As a result, the refrigerant in the swash plate chamber 24 flows into the supply passage 211 via the lubrication channels 49A, 49B, 49C, the housing chamber 132 and the communication hole 212.

In the fourth embodiment, the same effects as the items (3-1) to (3-4) in the third embodiment can be obtained. Bolt holes 47, 47A, 47 parallel to the rotary shaft 21
B, 47C and the grooves 113, 114, 115 formed on the end surface of the cylinder block 11 are
It can be formed at the same time when 1 is molded in a mold. Therefore, the lubrication flow path 49 utilizing the bolt holes 47A, 47B, 47C.
A, 49B, and 49C have a simple structure that does not require drilling with a drill or the like.

Next, a fifth embodiment shown in FIG. 11 will be described. The same components as those in the fourth embodiment are designated by the same reference numerals. In the fifth embodiment, the cylinder block 11
Groove 152 on the face of the valve plate 15 facing the end face of the
Are formed. The groove 152 communicates with the bolt hole 47A and the shaft through hole 48. The shaft through hole 48, the groove 152, and the bolt hole 47 </ b> A form a lubrication flow path 50 that connects the swash plate chamber 24 and the housing chamber 132. Other configurations are
This is the same as the case of the fourth embodiment.

In the fifth embodiment, the same effect as in the fourth embodiment can be obtained. The following embodiments are possible in the present invention. (1) The present invention is applied to a fixed displacement piston type compressor equipped with a single-headed piston.

(2) The present invention is applied to a piston type compressor provided with a cam body having a shape other than the swash plate. (3) A plurality of lubrication channels in the third embodiment may be provided.

(4) The lubrication flow passage in the third embodiment may be provided above the rotation axis. (5) The number of lubrication flow paths in the fourth embodiment is set to 1
Only one book or a plurality of books other than three books may be provided.

(6) The lubrication flow passage in the fourth embodiment may be provided above the rotation axis. (7) In the fifth embodiment, the groove 152 is provided on the surface side of the valve plate 15 facing the cylinder block 11, but the valve plate 15 facing the valve forming plate 16 is provided.
The groove 152 may be provided on the surface side.

(8) A thin plate-shaped gasket for preventing gas leakage is interposed between the valve forming plate 16 and the valve plate 15 on the front housing 13 side, and the shaft through hole 48 is provided.
The gasket may be provided with a slit that communicates with the bolt hole.

The technical ideas that can be understood from the above-described embodiment will be described below. [1] In any one of claims 1 to 5,
The piston is a double-headed piston lubrication structure in a piston type compressor.

[2] In any one of claims 1 to 5 and [1], the piston type compressor is a lubricating structure for a piston type compressor which is a fixed displacement type piston compressor.

[3] Any one of claims 6 and 7
In the paragraph (1), a bolt hole for inserting a bolt for joining a front housing constituting the whole housing and a cylinder, and a groove formed on an end surface of the cylinder so as to be connected to the bolt hole are provided in the lubricating passage. Lubrication structure in at least a part of piston type compressor.

[4] In any one of claims 6 and 7 and [3], the suction pressure region is
Lubrication structure in the piston type compressor which is a suction chamber in the entire housing communicating with the external refrigerant circuit.

[5] In any one of [6], [7], [3] and [4], the rotary valve is a piston type compressor integrally formed with the rotary shaft. Lubrication structure in.

[6] A lubricating structure in a piston type compressor according to any one of claims 6, 7 and [3] to [5], wherein the piston is a double-headed piston.

[7] In any one of [6], [7] and [3] to [6], the piston type compressor is a fixed displacement type piston type compressor. Lubrication structure in machine.

[0070]

As described in detail above, in the invention in which the shaft sealing device is housed in the housing chamber and the lubricating passage is provided for communicating the housing chamber with the suction pressure region via the inside of the rotary shaft. The excellent effect that the lubricity of the shaft sealing device in the piston type compressor using the rotary valve can be improved.

The shaft sealing device is housed in the housing chamber, and the housing chamber is communicated with the suction pressure region through the inside of the rotary shaft.
In the invention in which the cam chamber that accommodates the cam body and the lubrication flow path for communicating the accommodation chamber are provided, it is possible to improve the lubricity of the shaft sealing device in the piston compressor that uses the rotary valve. Produce an effect.

[Brief description of drawings]

FIG. 1 shows a first embodiment, and FIG. 1 (a) is a side sectional view of an entire compressor. (B) is the sectional view on the AA line of (a).

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view taken along line CC of FIG.

FIG. 4 is a side sectional view of the entire compressor showing a second embodiment.

5 is a sectional view taken along line DD of FIG.

6 is a cross-sectional view taken along the line EE of FIG.

FIG. 7 shows a third embodiment, wherein (a) is a side sectional view of the entire compressor. (B) is the FF sectional view taken on the line of (a).

FIG. 8 is a cross-sectional view taken along line GG of FIG.

FIG. 9 shows a fourth embodiment, wherein (a) is a side sectional view of the entire compressor. (B) is the HH sectional view taken on the line of (a).

FIG. 10 is a sectional view taken along line I-I of FIG.

FIG. 11 is a side sectional view of a main part showing a fifth embodiment.

[Explanation of Codes] 11, 12 ... Cylinder block that constitutes the entire housing and cylinder. 13 ... A front housing that constitutes the entire housing. 131, 141 ... Discharge chamber. 132 ... accommodation room. 14 ... A rear housing that constitutes the entire housing. 142 ... A suction chamber which is a suction pressure region. 21 ... A rotating shaft.
211 ... A supply passage forming a passage for lubrication. 212 ... A communication hole forming a lubrication passage. 214, 215 ... Connection part. Two
2 ... Shaft sealing device. 23 ... A swash plate that is a cam body. 24 ... A swash plate chamber as a cam chamber. 27, 28 ... Cylinder bore. 271,
281 ... Compression chamber. 29 ... Double-headed piston. 31, 32 ... Introduction passage. 35, 36 ... Rotary valve. 37 ... Lubrication passage. 38 ... rotary shaft. 382 ... A supply passage forming a passage for lubrication. 385 ... A communication hole forming a lubrication passage. 39,4
0 ... Rotary valve. 41, 42 ... Introduction passage. 45 ... Lubrication passage. 46, 49A, 49B, 49C, 50 ... Lubrication channel.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akio Saeki             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Masatoshi Sakano             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries (72) Inventor Jun Kondo             2-1, Toyota-cho, Kariya City, Aichi Stock Association             Inside Toyota Toyota Industries F term (reference) 3H076 AA07 BB17 CC20 CC29 CC36                       CC67 CC72 CC83 CC92 CC94

Claims (7)

[Claims] 1. A piston is housed in a plurality of cylinder bores arranged around a rotary shaft, and the piston is interlocked with the rotation of the rotary shaft via a cam body integrated with the rotary shaft. A rotary valve having an introduction passage for introducing a refrigerant from a suction pressure region into a compression chamber defined by the cylinder bore to prevent fluid leakage along the peripheral surface of the rotary shaft from the entire housing of the compressor. A piston type compressor provided with a shaft sealing device for preventing it between the entire housing and the rotary shaft, wherein the shaft sealing device is housed in a storage chamber, and a supply passage is provided in the rotary shaft. A piston-type pressure provided so as to communicate with the region, the introduction passage of the rotary valve being communicated with the supply passage, and the lubrication passage being provided for communicating the supply passage and the storage chamber. Lubrication structure in the compressor. 2. The lubricating structure for a piston type compressor according to claim 1, wherein the lubricating passage comprises a communication hole formed in a peripheral surface of the rotary shaft and the supply passage. 3. A discharge chamber for discharging the refrigerant from the compression chamber is provided around the accommodation chamber, and a connecting portion between the introduction passage of the rotary valve and the supply passage, the communication hole, and the supply passage are formed. The lubrication structure in the piston type compressor according to claim 2, wherein the connection portion and the connection portion are arranged close to each other. 4. The lubricating structure for a piston type compressor according to claim 1, wherein the suction pressure region is a suction chamber in the entire housing that communicates with an external refrigerant circuit. 5. The lubricating structure for a piston type compressor according to claim 1, wherein the rotary valve is integrally formed with the rotary shaft. 6. A piston is housed in a plurality of cylinder bores arranged around a rotary shaft, and the piston is interlocked with the rotation of the rotary shaft via a cam body integrated with the rotary shaft, A rotary valve having an introduction passage for introducing a refrigerant from a suction pressure region into a compression chamber defined by the cylinder bore to prevent fluid leakage along the peripheral surface of the rotary shaft from the entire housing of the compressor. A piston type compressor provided with a shaft sealing device for preventing it between the entire housing and the rotary shaft, wherein the shaft sealing device is housed in a storage chamber, and a supply passage is provided in the rotary shaft. Is formed so as to communicate with the region, the introduction passage of the rotary valve is communicated with the supply passage, the accommodation chamber is communicated with the supply passage, and a cam chamber for accommodating the cam body is provided. A lubrication structure in a piston type compressor provided with a lubrication passage for communicating with the storage chamber. 7. The piston according to claim 6, wherein the cam chamber is formed in a cylinder provided with the cylinder bore, and the lubricating flow passage penetrates the cylinder and communicates with the cam chamber. Lubrication structure in a compressor.