JPS6360238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary compressor, and is effective for use as a refrigerant compressor in, for example, an automobile cooling system.

In refrigerant compressors such as automobile cooling equipment,
If the refrigerant gas in the refrigeration cycle decreases more than necessary, the shortage of refrigerant gas must be replenished, and if operation continues with the refrigerant gas shortage, the cooling capacity will decrease. death,
As the temperature of the refrigerant gas increases, the lubricating oil leaks out, causing the inside of the housing to become extremely hot and exceeding the allowable temperature, which can cause seizures and other problems in the sliding parts of the refrigerant compressor. There are problems that can cause damage.

Based on this, the present inventors considered the following configuration. That is, a discharge cover was provided near the discharge port where the discharge flow rate was fastest and the discharge temperature was highest, and a temperature sensor was provided on this discharge cover. Furthermore, a waterproof cap is installed to protect this temperature sensor from water, and this temperature sensor detects the discharge refrigerant temperature, and when the discharge refrigerant temperature exceeds a predetermined temperature, an electromagnetic capacitor transmits the driving force from the engine to the refrigerant compressor. I thought of a configuration where the clutch is disconnected.

However, while operating such a compressor, a situation occurred during which the compressor became inoperable. Therefore, the inventors conducted various investigations and found that the contact point of the temperature sensor was causing a conduction failure, which caused the electromagnetic clutch that transmitted the driving force to the compressor to be disconnected regardless of the discharge temperature. . As a result of further investigation by the present inventors, the entire compressor reaches a very high temperature due to its compression operation, and due to this high temperature, the waterproof cap and the resin potting of the temperature sensor 30 shown in FIG. layer 30b
Organic gas was generated from the lead wire 35 and the covering material of the lead wire 35. Then, the organic gas enters into the metal housing 30a through the gap between the metal housing 30a and the resin potting layer 30b of the temperature sensor 30, and the organic gas filled with oxygen is prevented from escaping by the waterproof cap. A reaction occurred, producing oxidized compounds. It was found that this oxidized compound and the like adhered around the contacts 30c and 30d and acted as an insulating film, resulting in poor conduction of the contacts.

In view of the above-mentioned points, it is an object of the present invention to efficiently discharge organic gas generated in a space formed by a waterproof cap and a discharge cover to the outside, thereby preventing contact failure of a temperature sensor.

In order to achieve this object, the present invention provides a discharge cover that is provided to cover the discharge port and holds a temperature sensor in the opening thereof, and is provided with a through hole that communicates between the inside and outside. The waterproof cap arranged to cover the through hole was provided with an escape path at a position opposite to the through hole.

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

In FIG. 1, 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 integrally formed with the shaft 2;
A vane is slidably supported within the rotor 3, and the tip of the vane 4 comes into sliding contact with the inner surface of the housing 1. 5 and 6 are end plates arranged at both open ends of the housing 1.

The cylinder chamber R is defined by the inner surface of the housing 1, the outer surface of the rotor 3, the inner surfaces of the end plates 5 and 6, and the vane 4. and housing 1
A discharge hole is opened at a portion where the volume of the cylinder chamber R decreases the most. Further, the shaft 2
is the end plate 5, 6 via the bearing 10, 11
is rotatably supported.

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 inside the front cover, which prevents the refrigerant in the suction chamber 8 from leaking due to the shaft 2.
A suction hole is opened in the front end plate 5 and communicates the suction chamber 8 with 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. 1
6 is a discharge chamber cover disposed on the side of the housing 1 to cover the discharge hole, and a bolt (not shown)
Fixed by A discharge reed valve 19 is arranged on the discharge chamber cover 16 side of the discharge hole 18. Reference numeral 20 denotes a holding plate for the discharge reed valve 19, which is fixed to the housing 1 with bolts together with the discharge reed valve. 22 is an O-ring that seals between the discharge chamber cover 16 and the housing 1. Note that the O-ring groove of the discharge cover 16 has a rectangular shape, and fitting a circular O-ring into such an O-ring groove will cause an assembly failure and, in turn, a seal failure. Therefore, in this embodiment, a rectangular O-ring 22 suitable for the rectangular O-ring groove is formed in advance and fitted into the O-ring 22. Discharge chamber cover 16
and a discharge communication hole 27 in the rear end plate 6.
is formed, and the discharge chamber 28 and the oil separator 14 communicate with each other through the communication hole 27.

A gasket 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 1, and an O-ring 24 is disposed between the housing 1 and the rear end plate 6. is provided with an O-ring 25,
Further, a gasket is disposed between the rear end plate 6 and the rear cover 13, and in this state, the members 7, 5, 1, 6, 13 are integrally connected by bolts 26.

A cylindrical holding part 16a is formed on the discharge chamber cover 16, and a temperature sensor 30 having a stepped cylindrical outer shape is fitted into the inner circumferential surface of the holding part 16a via an O-ring 31. It protrudes within 28. The stepped portion 30a of the temperature sensor 30 engages with a locking portion 16b provided on the inner periphery of the holding portion 16a, thereby preventing the temperature sensor 30 from falling toward the discharge port side. This temperature sensor 30 has a C-shaped circlip 32.
is arranged so as to span both the upper surface of the temperature sensor 30 and the inner wall of the holding portion 16a. Since the circlip 32 has a C-shape, a through hole 33 is formed diagonally from the top surface to the bottom surface in the holding portion 16a facing the notch to ensure an outflow path in the event that water enters. ing.

Further, a waterproof cap 34 having a substantially cup shape is fitted on the upper outer periphery of the holding portion 16a, and is made of a rubber such as enlene propylene rubber (EPDM, EPM) having heat resistance, chemical resistance, freezer oil resistance, and ozone resistance.
formed from. The open end 34b of the waterproof cap 34 is fitted into a locking groove 16c provided on the outer periphery of the holding portion 16a, thereby preventing the waterproof cap 34 from coming off. The front view of this waterproof cap 34 is shown in Fig. 2, the plan view is shown in Fig. 3, and the -
A sectional view is shown in FIG. 4, and a vertical sectional view of this waterproof cap 34 is shown in FIG. As can be seen from these figures, a substantially prismatic grommet portion 34a extending laterally is provided on the side peripheral surface of the waterproof cap 34, and the lead wire 3 connected to the temperature sensor 30 is provided with a grommet portion 34a extending laterally.
5 is fixed by this grommet portion 34a. Furthermore, two holding paths 34b are provided inside the grommet portion 34a and hold the lead wires 35.
is provided with apertures 34c at two locations,
The lead wire 35 is held more firmly, and the holding path 34
This prevents water from entering the waterproof cap 34 through the b. In addition, this grommet portion 34a
A recess 34d with a rectangular cross section and a uniform width and depth is provided on the outer periphery of the recess 34b.
A clamp 36 having a shaped gripping portion is fitted into the recess 34d so as to grip the recessed portion 34d with the gripping portion. One end of this clamp 36 is fixed to the rear cover 13 with a bolt 37, and holds the chrome section 34a. Therefore, even if the lead wire 35 vibrates due to external vibration, the vibration will be transmitted to the grommet portion 34a made of rubber.
Since it is absorbed at the temperature sensor 30, it is prevented from being cut at the base of the temperature sensor 30. Furthermore, if the concave portion 34d of the grommet portion 34a is made to have the same width all the way to the tip, the gripping portion of the clamp 36 may fit diagonally into the grommet portion 34a, and when the clamp 36 is attached, it may be left in an incompletely attached state. There is a risk that you will become accustomed to it. However, in this embodiment, the recess 34d has the same width as the gripping portion of the clamp 36.
By providing this, the clamp 36 can be reliably fitted, the ease of assembling the clamp to the grommet portion 34a is improved, and the above-mentioned fear is avoided.

Furthermore, when the waterproof cap 34 is fitted into the discharge cover 16, if the waterproof cap 34 closes the through hole 33, organic gas will not escape from the through hole 33. An escape path 34e is formed at the location.
Therefore, the organic gas discharged from the through hole 33 is discharged to the outside of the compressor through the escape path 34e.
Note that the waterproof cap 34 is connected to the grommet portion 3.
4a is held by the clamp 36 and its position and direction are fixed, so that the escape path 34e
The alignment between the through hole 33 and the through hole 33 can be easily performed.

Furthermore, if water were to enter the space formed by the waterproof cap 34 made of rubber and the discharge cover 16, there is a risk that the water would cause poor conductivity or welding of the contacts. It is also discharged to the outside of the compressor through the through hole 33 and the escape path 34e.

Next, the operation of the compressor configured as described above will be explained. When the driving force of the automobile driving engine is transmitted to the shaft 2 through the electromagnetic clutch, the shaft 2 rotates, and at the same time, the rotor 3 also rotates within the housing 1. Due to this rotation, the volume of the cylinder chamber R is linked, and at a portion where the volume increases, the refrigerant introduced from the evaporator of the refrigeration cycle is sucked into the cylinder chamber R from the suction hole. As the rotor rotates, this refrigerant is compressed, and the high-pressure refrigerant is discharged into the discharge chamber 28 from the discharge hole. Thereafter, the lubricating oil flows out from the passage 27 to the oil separator 14, and after separating the lubricating oil in the oil separator, is discharged from the passage 15 to the condenser side.

While refrigerant gas is circulating through the refrigeration cycle, there is a possibility that it may leak from each joint, and if the amount of refrigerant gas becomes insufficient, the cooling effect of the refrigerant gas itself on the entire compressor may decrease, and the compression ratio may decrease. The discharge temperature rises due to the rise in temperature, etc. As the discharge temperature rises, the sliding portion expands and its clearance becomes smaller, creating a risk of seizure. Furthermore, the discharge temperature when the amount of refrigerant gas is insufficient is much higher than the temperature during severe operation. Therefore, the temperature of the discharged refrigerant gas is detected by the temperature sensor 30, and when the temperature of the discharged refrigerant gas becomes much higher than the temperature during severe operation, it is assumed that there is a shortage of refrigerant gas, and the driving force is transmitted to the compressor. Disconnect the electromagnetic clutch. That is, when the temperature is high, the bimetal 30e of the temperature sensor 30 is reversed, and the contact 30c is dissociated from the contact 30d. As a result, the operation of the compressor can be stopped before the sliding parts seize. Also, when the discharge temperature decreases, the bimetal 30e returns to its original state and the contact 3
0c and 30d are closed.

In this way, when a device like the present embodiment is used, since the grommet portion 34a faces to the side, it is difficult for water to enter through the gap between the lead wire 35 and the grommet portion 34a, and further, A recess 34d is provided in the grommet portion 34a, and a clamp 36 is attached to the recess 34d.
It can be clamped securely by fitting. Furthermore, when clamping the lead wire 35, it is usually necessary to hold the lead wire 35 with a holding member such as a vinyl tube, and clamp the holding member with a clamp 36, but in this embodiment, a grommet provided on the waterproof cap 34 is used. Since it is clamped by the portion 34a and the clamp 36, the above-mentioned holding member is unnecessary. Furthermore, even if organic gas is generated or water enters the space formed by the temperature sensor 30 and the discharge cover 16, it can be discharged from the through hole 33 and the escape path 34e, and the temperature sensor 30 contact failures can be prevented.

As explained above, if a rotary compressor like the one of the present invention is used, it is possible to prevent water intrusion that would cause an abnormality in the temperature sensor that detects the temperature of the discharged fluid, and also to prevent water from entering the compressor, which would cause an abnormality in the temperature sensor that detects the temperature of the discharged fluid. The organic gas generated in the space can be quickly discharged to the outside.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention;
Fig. 2 is a front view showing the waterproof cap of the device shown in Fig. 1, Fig. 3 is a plan view of Fig. 2, Fig. 4 is a sectional view of Fig. 2, and Fig. 5 is a vertical sectional view of the waterproof cap. FIG. 6 is a longitudinal sectional view showing the temperature sensor. 16...Discharge cover, 30...Temperature sensor, 3
3...Through hole, 34...Waterproof cap, 34a...
...Grommet part, 34e...Escape path, R...Cylinder chamber.

Claims (1)

[Claims] 1. A housing forming a cylinder chamber that changes volume, a suction hole for sucking fluid into the cylinder chamber, a discharge hole for discharging fluid in the cylinder chamber to the outside, and a housing for covering the discharge hole. a temperature sensor fitted into a holding portion of the discharge cover to detect the temperature of the fluid discharged from the discharge hole; a through hole communicating between the inside and outside of the discharge cover; A rotary compressor comprising a holding portion and a waterproof cap disposed to cover the through hole and provided with an escape path at a position facing the through hole of the discharge cover.