JPS6022095A - Compressor - Google Patents

Abstract

PURPOSE:To eliminate pressure piping and mount a solenoid valve in compact by a method wherein the solenoid valve, controlling a high pressure for a bypass valve, is provided at the side of a housing by pinching it together with an end plate in order to utilize the inside of the valve as the path of high pressure. CONSTITUTION:The solenoid valve 29, functioning as a pressure controller, is arranged at the side of the housing 1 and the front end thereof is retained by the front end plate 5 while the rear end thereof is retained by the rear end plate 6. The solenoid valve 29 is fitted into the front end plate 5 forcibly, then, is arranged at the side of the housing 1 together with the end plate 5 while the rear end plate 6 is arranged at the outside of the solenoid valve 29 under said condition of the solenoid valve 29 and the front end plate 5. Thereafter, a protuberance, formed integrally with a stator core at the rear end of the housing, is inserted into a retaining hole on the rear end plate, then, is attached integrally with a front cover 7 through bolts 26.

Description

[Detailed Description of the Invention] The present invention relates to a compressor, and is effective for use, for example, in compressing refrigerant in automatic Ichikawa air conditioners.In recent years, refrigerant compressors have been able to vary their compression capacity according to the cooling capacity. There have been proposals to do so. In this system, the cylinder chamber and the suction chamber are connected by a bypass port, and this bypass port is opened and closed by a bypass valve. By opening the bypass port, the refrigerant in the cylinder chamber is returned to the suction chamber side, thereby variably controlling the discharge volume of the cylinder chamber. The bypass valve is controlled by controlling the discharge pressure led behind the bypass valve using a solenoid valve.

However, in the compressors that have been proposed so far, no special consideration has been given to the method of installing this solenoid valve. As shown in Figure ff16, the solenoid valve was simply attached to the outside of the conventionally formed housing.

For this reason, conventional models require piping to lead the discharge pressure to the solenoid valve and piping to lead the pressure controlled by the solenoid valve to the bypass valve, which complicates processing and assembly.
Since there are many piping connections, sealing failures are likely to occur, resulting in gas leaks. Moreover, since the solenoid valves and pressure piping are mounted outside, they are subject to external shocks, and therefore must be handled with particular care during assembly.

The present invention was devised in view of the above points, and aims to omit pressure piping and mount a solenoid valve in a compact manner.

Therefore, the present invention adopts a configuration in which the solenoid valve is disposed on the side of the housing, sandwiched between end plates, and the inside of the solenoid valve is made into a high pressure passage.

Next, one embodiment of the present invention will be described with reference to the drawings.

In FIGS. 1 to 4, a housing 1 has a cylindrical shape and has a cylinder chamber R formed therein. A shaft 2 rotates by receiving driving force from an automobile engine (not shown) via an electromagnetic clutch. 3 is a rotor formed integrally with the shaft 2; 4 is a vane slidably inserted into the rotor 3; the tip of the vane 4 comes into sliding contact with the inner surface of the housing 1; Reference numerals 5 and 6 designate end plates disposed at both open ends of the housing 10.

The cylinder chamber R is defined by the inner surface of the housing 1, the outer surface of the rotor 3, the inner surface of the end plate 5, 6, and the vane 4. A discharge hole 18 is opened at a portion of the housing 1 where the volume of the cylinder chamber R decreases the most. Further, the shaft 2 is rotatably supported by the end plate 5.6 via a bearing 1111.

A front cover 7 is disposed in front of the front end plate 5 and forms a suction chamber 8 between it and the front end plate 5. Reference numeral 9 denotes a shaft sealing device disposed within the front cover, which prevents the refrigerant in the suction chamber 8 from leaking to the shaft 2.

A suction hole 12 is opened in the front end plate 5 and communicates between the suction chamber 8 and the volume increasing portion of the cylinder chamber R.

A rear cover 13 is disposed on the rear side of the rear end plate 6, and forms an oil separator 14 between it and the rear end plate 6. A discharge passage 15 is opened in the rear cover 13 and communicates with a condenser (not shown) of the refrigeration cycle. A discharge chamber cover 16 is disposed on the side surface of the housing 1 so as to cover the discharge hole 18.
Fixed by 7. 19 is a discharge valve, which is disposed in the discharge chamber cover 16 (1111) of the discharge hole 18. 20 is a holding plate for the discharge reed valve 19, which is attached to the bolt 2 together with the discharge reed valve.
1 to the housing 1. 22 is O for sealing between the discharge chamber cover 16 and the housing l.
It's a ring. . A discharge communication hole 27 is formed in the discharge chamber cover 16 and the rear end plate 6, and the discharge chamber 28 and the oil separator 14 communicate with each other through the communication hole 27.

A gasket 23 is disposed between the front cover 7 and the front end plate 5, an O ring 24 is disposed between the front end plate 5 and the housing l, and an O ring 24 is disposed between the housing l and the rear end plate 6. is O
A ring 25 is provided, and a gasket is also provided between the rear end plays 1 and 6 and the rear cover 13, and each member 7.5.1.6.13 is connected together with bolts 26 in this state. There is C.

Reference numeral 29 denotes an electromagnetic source forming a pressure controller, which is disposed on the side of )\Using (2), whose front end is locked by the front end plate 5, and its rear end is locked by the rear end plates 1 and 6.

In FIG. 5, 30 is a housing of the electromagnetic valve 29, and a valve seat 31, a valve body 32, a steering ring 33, and a coil 34 are disposed within this housing 30. When the coil 34 is not energized, the ball 3 welded to the valve body 32
5 is pressed against the valve seat 36 by a spring 33 and closes the communication hole 37.

When the coil 34 is energized, the valve body 32 is attracted toward the coil 34 and moves to a position where it contacts the stopper 38. A gap is ensured between the moving core 39 and the stator core 40. Further, the side surface of the valve body 32 is chamfered to ensure a gas passage. Therefore, the gas in the oil separator 14 is transferred to the filter 41 and the communication hole 42.
It can flow to the communication hole 37 through the.

This solenoid valve 29 is first press-fitted into the C front end plate 5 through the O-ring 35, and then placed together with the end plate 5 on the side of the housing song 1, and with this condition, the rear end plates 1 and 6 are moved outward from the solenoid valve 29. Then, a protrusion 30a formed integrally with the stator core 40 at the rear end of the housing 30 is inserted into the locking hole 13a of the rear end plate.
the front cover 7 with the bolts 26.
are integrally connected.

Therefore, in this example, the solenoid valve 29 is connected to the end plate 5.
．． 6, so that the solenoid valve 29 is also protected by the end plate 5.6. That is,
The end plate 5.6 is the housing 3 of the solenoid valve 29.
In the case where ζ projects slightly outward from 0 and an external force is applied to the compressor, the external force hits the end plate 5.6,
It does not directly join the housing 30. Furthermore, in this example, the solenoid valve 29 is housed within the projected area of the front cover 7 and the rear cover 13, so the provision of the solenoid valve 29 does not cause the shape of the compressor to protrude significantly.

Further, since a communication hole for guiding high pressure to the low pressure side via the solenoid valve is provided inside the solenoid valve 29, there is no need to provide high pressure piping outside the compressor.

Furthermore, compared to the case where no high-pressure piping is installed inside the housing 1, there is no need to seal the piping between the housing 1 and the end plates 5 and 6, which greatly simplifies processing and assembly. .

The front end plate 5 has a cylinder chamber R and a suction chamber 8.
One or more bypass boats 43 are opened to communicate with the above. The opening positions of this bypass port 43 on the cylinder chamber R side are a position 43a where the cylinder chamber R is blocked from the suction hole 12 and moved to the compression stroke, and a position 43b further on the discharge hole 18 side from that position. Further, a valve chamber 45 is formed in the front end plate 5 in a direction perpendicular to the bypass port 43, and a bypass valve 44 for opening and closing the bypass port 43 is slidably supported within the valve chamber 45. . A spring 46 is disposed in the valve chamber 45 and urges the bypass valve 44 in the direction in which the bypass port 43 opens. Reference numeral 47 denotes a spring receiver, which is pushed into the bypass chamber 43.

The passage 48b formed in the gas get 23 is connected to a communication passage 49 connected to the communication hole 37 of the electromagnetic valve 29 described above, and therefore the passage 48b is connected to the communication passage 49 connected to the communication hole 37 of the electromagnetic valve 29 described above.
The passage 48c1 communicates with the communication hole 37 of the solenoid valve 29 via the communication passage 49, and further communicates with the oil separator 14 from the communication hole 42 at the rear of the solenoid valve via the communication hole 37 inside the solenoid valve 29.

Next, the operation of the compressor configured as described above will be explained. The driving force of the car engine is transferred to shift 2 via the electromagnetic clutch.
, the shaft 2 rotates, and at the same time the low gear 3 rotates inside the housing 1. This rotation causes the cylinder chamber R
The refrigerant introduced from the evaporator of the freezing cycle is sucked into the cylinder chamber R through the suction hole 12 at the portion where the volume increases. Compressed as the rotor rotates,
The high-pressure refrigerant is discharged from the discharge hole 18 into the discharge chamber 28 . Thereafter, the lubricating oil flows out from the passage 27 into the oil separator 14, separates the lubricating oil within the oil separator, and is then discharged from the passageway 5 toward the condenser.

When the compressor is started, it is necessary to reduce the starting load so as not to apply a large impact to the vehicle engine. That is, at startup, it is necessary to open the bypass port 43 to reduce the discharge capacity of the compressor. In this example, at startup, since there is no pressure difference between the front and rear surfaces of the bypass valve 440, the valve 44 is driven by the spring 46 and the boat 43 is opened. Therefore, the compressor of this example does not give a shock to the engine during startup, and does not cause discomfort to the occupants.

In a state where the compressor is required to have sufficient discharge capacity, the bypass valve 44 needs to keep the bypass port 43 closed. Therefore, high pressure is transmitted to the valve chamber 4 through the communication passage 48.
The voltage is applied to the rear surface of the bypass valve 44 of No. 5, and the vibe 44 closes the boat 43. That is, under normal operating conditions, the compressor is operated at maximum capacity and provides sufficient cooling capacity.

When the temperature in the room has dropped sufficiently and the discharge capacity of the compressor has exceeded the required capacity, '@ Solenoid valve communication passage 37
Close. Therefore, the pressure in the /l rev chamber 45 leaks from the side surface of the bypass valve 44 and gradually decreases, becoming almost equal to the suction pressure. Therefore, the valve 44 is driven by the spring 46 to open the l-meat 43. Therefore, when the compression force becomes excessive, the bypass port opens and the discharge capacity of the cylinder chamber R decreases. l1lI, the compressor discharge capacity can be reduced depending on the required capacity.

The electromagnetic brake r29 is activated by an electric signal according to the operating state G of the refrigeration cycle, and opens and closes the communication passages 37 and 42.
). As described above, in the case of this example, the opening and closing of the passages 37 and 42 can be freely controlled in accordance with the electric signal, so that the discharge capacity of the compressor can be freely controlled. That is, the compressor discharge capacity can be varied based on the temperature inside the vehicle, the electric signal from the solar radiation sensor, the engine speed, etc.

Although the above-mentioned embodiments are preferred examples of the present invention, the present invention should not be limited to these embodiments, and there are various other embodiments.

That is, in the embodiment shown in FIG. 1, the rear surface of the housing 29 is supported by the rear end plate 13 via the rear end plate 6, but as shown in FIG. The compressor may be directly supported by the rear cover 13. In this case, first, the tip of the solenoid valve 29 is press-fitted into the front cover 7 via the O-ring 35, and in that state, it is clamped together with the front cover 7, front end plate 5, housing 1, rear end plate 6, and rear cover 13 with the bolts 26. Fix it.

Further, in the above-described embodiments, the present invention is applied to a so-called vane type compressor, but the present invention can be applied to other types of compressors as long as they have a housing 1 and front and rear end covers 7.14. is also applicable.

Furthermore, in the above example, the valve chamber 45 is connected to the bypass port 4.
3, and the bypass valve 44 opens and closes the port 43 by sliding inside the valve chamber 45. However, the direction in which the valve chamber 45 is formed may be changed as shown in FIG. That is, a valve chamber 45 may be formed in the same direction as the bypass port 43, and the knob 44 may be disposed within this valve chamber 45.

As explained above, in the compressor of the present invention, since the pressure controller is arranged on the side of the housing 1, the compression chamber does not have a particularly large discharge due to the arrangement of the pressure controller, and the shape is compact. It has an excellent effect of being able to cover the surface.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the compressor of the present invention, Fig. 2 is a sectional view taken along arrow 1-n in Fig. 1, and Fig. 3I is a sectional view showing an embodiment of the compressor of the present invention.
4 is a sectional view showing the front cover of the compression valve shown in FIG. 1, FIG. 5 is an enlarged sectional view of the solenoid valve shown in FIG. FIG. 7 is a cross-sectional view showing another example of an actual can of the compressor of the present invention. l...Housing 12...Shaft, 3...Rotor. 5.6... End plate, 29... Solenoid valve. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2

Claims (1)

[Claims] A cylindrical housing that forms a cylinder chamber inside, an end plate that covers the sealing point of this housing, a bypass port that is formed on this end plate and communicates the cylinder chamber and the suction chamber, and a signal pressure that connects this bypass port. a bypass valve that opens and closes in response to the above, and a solenoid valve that controls high pressure guided to the bypass valve, the solenoid valve being disposed on the side of the housing and sandwiched together with the end plate; A compressor in which the inside of the solenoid valve is a high pressure passage.