JPH0988858A - Rotary compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the wear of an outer circumference of a roller piston due to shortage of the lubricating oil by opening an oil feed valve provided between an opening part in the lubricating oil in an oil feed pipe and an opening part on a suction pipe side in an interlocking manner with a defrosting detecting means to feed the lubricating oil even when the lubricating oil on the outer circumference of the roller piston is washed away. SOLUTION: In a cooling system of a refrigerator, when a compressor 1 is operated for some time, an evaporator 20 is frosted, and the frost is removed by heating the evaporator 20 by a defrosting device 21. When a defrosting means 22 detects the start of the compressor 1 next to the action signal of the defrosting device 21, an oil feed valve 23 is opened. The lubricating oil 12 of high pressure in an enclosed casing 2 flows into a suction chamber in a cylinder of low pressure passing a suction pipe 13 and a suction passage through an oil feed pipe 24, and lubricates the outer circumference of the roller piston 6. When the oil feed valve 23 is opened, a closing command delaying means 25 detects the open signal, and the oil feed valve 23 is closed after the prescribed period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor for refueling the outer circumference of a roller piston.

[0002]

2. Description of the Related Art A conventional rotary compressor is disclosed in
-199990.

An example of the conventional rotary compressor will be described below with reference to the drawings. In FIG.
(A) is a longitudinal cross-sectional view of a conventional rotary compressor, (b)
FIG. 4A is a cross-sectional view taken along line AA in (a).

In FIG. 6, reference numeral 1 is a compressor, 2 is a closed casing, and 3 is an electric motor section, which is composed of a cylinder 5, a roller piston 6, a vane 7, a main bearing 8, and a sub bearing 9 via a shaft 4. It is connected to the machine body. 4a is a shaft eccentric part.

Reference numerals 10 and 11 are a suction chamber and a compression chamber surrounded by a roller piston 6, a vane 7, a main bearing 8 and a sub bearing 9 in the cylinder 5, respectively. Reference numeral 12 is a lubricating oil stored in the lower portion of the closed casing 2. A suction pipe 13 communicates with the suction chamber 10 via the auxiliary bearing 9 and the suction passage 14 of the cylinder 5. Reference numeral 15 denotes a discharge part, which is opened in the closed casing 2 via a discharge valve (not shown). Reference numeral 16 denotes a discharge pipe, which opens into the closed casing 2.

The operation of the rotary compressor constructed as above will be described below. The refrigerant gas flowing from the cooling system (not shown) is guided from the suction pipe 13 and the suction passage 14 to reach the suction chamber 10 in the cylinder 5. The refrigerant gas that has reached the suction chamber 10 is gradually compressed as the shaft 4 rotates and the shaft eccentric portion 4a and the roller piston 6 rotate.
5 is once discharged into the closed casing 2 through the discharge valve, and then discharged to the cooling system through the discharge pipe 16.

The roller piston 6 has a relative speed with respect to the vane 7 due to the balance between the viscous force of the lubricating oil between the inner periphery of the roller piston 6 and the shaft eccentric portion 4a and the frictional force between the vane 7 and the roller piston 6. Is spinning at.

In the refrigerator cooling system,
When the compressor 1 operates to some extent, frost adheres to the evaporator (not shown) that is a component of the cooling system, but the frost that has adhered is removed by heating the evaporator with a defroster (not shown). To be done.

[0009]

However, in the above-mentioned conventional configuration, the liquid refrigerant remaining in the pipe during the defrosting operation is pushed out by the vaporization of the liquid refrigerant in the evaporator, and the compressor 1 and the suction pipe 13 having a low temperature. Returns to the inside of the cylinder 5 and the liquid refrigerant flushes out the lubricating oil between the vane 7 and the roller piston 6, and the friction coefficient between the vane 7 and the roller piston 6 increases due to insufficient lubricating oil at the next start. Power increases. As a result, the outer periphery of the roller piston 6 and the contact portion of the vane 7 with the roller piston 6 may be worn, which may reduce the reliability of the compressor.

Further, in the above-mentioned conventional structure, when the amount of oil supply is increased, the efficiency is decreased due to a decrease in the amount of refrigerant sucked due to an increase in the amount of lubricating oil in the cylinder 5 during normal operation, and the inside of the closed casing 2 is discharged due to the discharge of the sucked lubricating oil. There is a possibility that reliability may decrease due to lack of lubricating oil during normal operation due to the decrease in oil level.

Further, in the above-mentioned conventional structure, the load applied between the vane 7 and the roller piston 6 becomes large when the ambient temperature is high, and the frictional force between the vane 7 and the roller piston 6 becomes large. As a result, the outer periphery of the roller piston 6 and the contact portion of the vane 7 with the roller piston 6 may be worn, or the refrigerant and lubricating oil may be thermally decomposed due to the temperature rise, which may reduce the reliability of the compressor.

The present invention solves the above-mentioned conventional problems, and has an object to improve reliability by improving an oil supply mechanism.

[0013]

In order to solve the above-mentioned problems, a rotary compressor according to a first aspect of the present invention comprises a cooling system comprising a compressor, a condenser, a pressure reducing device and an evaporator, and Lubricating oil stored in the lower portion of the closed casing of the compressor, a suction chamber and a compression chamber surrounded by a cylinder, a main bearing, a sub bearing, a roller piston, and a vane housed in the closed casing, and the suction chamber, A suction pipe that communicates a cooling system, an oil supply pipe that communicates the inside of the lubricating oil in the lower portion of the closed casing with the suction pipe or the suction chamber, a defroster provided near the evaporator, the defroster, and the defroster. Defrosting detection means interlocked with the compressor, an oil supply valve interlocked with the defrosting detection means, provided between the lubricating oil internal opening of the oil supply pipe and the suction pipe side opening, and interlocked with the oil supply valve. It is composed of a closing command delay means that.

According to the invention of claim 1, even when the lubricating oil on the outer periphery of the roller piston is washed away,
More lubrication oil can be supplied to the outer circumference of the roller piston, and wear due to insufficient lubrication oil on the outer circumference of the roller piston can be prevented.

According to a second aspect of the present invention, there is provided a rotary compressor in which a hermetic casing, lubricating oil accumulated in a lower portion of the hermetic casing, a cylinder housed in the hermetic casing, a main bearing, and a sub bearing. A suction chamber and a compression chamber surrounded by a bearing, a roller piston, and a vane, a shaft rotatably supported by the main bearing and a sub-bearing, and rotatably inscribed in the roller piston, and cooling of the suction chamber and the outside of the closed casing. A suction pipe that communicates with the system, an oil supply pipe that communicates the inside of the lubricating oil in the lower portion of the closed casing with the suction pipe or the suction chamber, and speed detection means that works with the shaft and the roller piston or the roller piston and the vane. And interlocking with the speed detecting means, between the lubricating oil inner opening and the suction pipe side opening of the oil supply pipe. It is composed of a refueling valves.

According to the second aspect of the present invention, by detecting the relative speed between the shaft eccentric portion and the roller piston, whenever the frictional force between the vane and the roller piston becomes large, the roller piston Lubricating oil can be supplied to the outer circumference, and wear due to insufficient lubricating oil on the outer circumference of the roller piston can be prevented.

In addition, when the lubricating oil is not actually washed out even at the time of starting after defrosting, the reliability and efficiency can be improved by not sucking the lubricating oil.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In the rotary compressor of the present invention, by the above-mentioned means, it is possible to wash out the lubricating oil between the vane and the roller piston, which leads to an increase in the friction coefficient of the contact portion between the outer periphery of the roller piston and the vane. At the time of starting after defrosting operation, the oil supply pipe increases the amount of oil supplied to the outer circumference of the roller piston for a certain period of time to reduce the friction coefficient and the frictional force between the vane and the roller piston to reduce the risk of wear. It is possible to lower the reliability and improve the reliability.

When the relative speed between the vane and the roller piston becomes slow, the amount of oil supplied to the outer circumference of the roller piston is increased by the oil supply pipe so that the lubricating oil can be actually washed off even after the defrosting operation. Not only when it occurs, or after defrosting, but also when the lubricating oil is washed out due to liquid back during normal operation of the compressor, the friction coefficient can be reduced to more accurately detect the friction between the vane and the roller piston. The frictional force can be reduced, the risk of wear can be reduced, the efficiency can be prevented from lowering, and the reliability can be improved.

Further, not only when the washout of the lubricating oil occurs, but also when the load applied to the vane and the roller piston leading to the increase in the frictional force between the vane and the roller piston is large, the oil supply amount is increased. By lowering the temperature of the contact portion between the vane and the roller piston, thermal decomposition of the refrigerant and lubricating oil can be prevented and reliability can be improved.

Next, a specific embodiment that exerts the action of the present invention will be described. (Embodiment 1) Hereinafter, Embodiment 1 of the rotary compressor according to the present invention will be described with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a vertical sectional view of a rotary compressor according to Embodiment 1 of the present invention, and FIG. 2 is an explanatory view of the same operation.

In FIGS. 1 and 2, reference numeral 20 is an evaporator which is a component of the cooling system. 21 is a defroster. Reference numeral 22 is a defrosting detector that works in conjunction with the defroster 21 and the compressor 1. Reference numeral 23 is a refueling valve that is interlocked with the defrosting detection means 22. Reference numeral 24 is an oil supply pipe that connects the lubricating oil 12 and the suction pipe 13 in the lower portion of the closed casing 2. Reference numeral 25 is a closing command delaying device that is interlocked with the refueling valve 23.

The operation of the rotary compressor constructed as described above will be described below. The defrosting detection means 22 starts the compressor 1 next to the operation signal L1 of the defrosting device 21.
When 2 is detected, the defrosting release signal S1 is output to the refueling valve 23. The oil supply valve 23 detects the defrosting opening signal S1 of the defrosting detecting means 22 and is opened.

At this time, the oil supply pipe 24 communicates the lower lubricating oil 12 in the closed casing 2 with the suction pipe 13, and the high pressure lubricating oil 12 passes through the oil supply pipe 24, the suction pipe 13 and the suction passage 14. And enters the suction chamber 10 in the cylinder 5 having a low pressure, and lubricates the outer circumference of the roller piston 6.

When the refueling valve 23 is opened, the closing command delay means 25 outputs the closing command S2 to the refueling valve 23 after a lapse of a predetermined time T after detecting the opening signal L3. The refueling valve 23 is closed upon detecting the closing command S2.

Therefore, even when the lubricating oil on the outer periphery of the roller piston 6 is washed away, more of the roller piston 6
The lubricating oil can be supplied to the outer periphery of the roller piston 6, and abrasion due to lack of lubricating oil on the outer periphery of the roller piston 6 can be prevented to provide a highly reliable rotary compressor.

As described above, the rotary compressor according to the first embodiment includes the compressor 1, the condenser 26, the decompression device 27, and the evaporator 2.
0, a lubricating oil 12 stored in the lower part of the closed casing 2 of the compressor 1, a cylinder 5 housed in the closed casing 2, a main bearing 8 and an auxiliary bearing 9
A suction chamber 10 and a compression chamber 11 which are surrounded by a roller piston 6 and a vane 7, a suction pipe 13 which connects the suction chamber 10 to the cooling system, a lubricating oil 12 inside the closed casing 2, and a suction pipe 13 or suction. An oil supply pipe 24 communicating with the chamber 10 and a defroster 21 provided near the evaporator 20.
And a defrosting detector 22 that works in conjunction with the defroster 21 and the compressor 1, and an oil supply pipe 24 that works in conjunction with the defroster 22.
Of the lubricating oil 12 and an opening on the suction pipe 13 side, and a closing command delay means 25 interlocking with the oil feeding valve 23, the roller piston 6
More lubricating oil can be supplied at the time of start-up after the defrosting operation, in which the lubricating oil on the outer periphery of the oil can be washed out.

Therefore, it is possible to prevent abrasion due to lack of lubricating oil on the outer periphery of the roller piston 6 and to provide a highly reliable rotary compressor.

(Second Embodiment) Next, a second embodiment of the rotary compressor according to the present invention will be described with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

FIG. 3 is a vertical sectional view of the rotary compressor of the second embodiment. 4A is a front view of the roller piston according to the second embodiment of the present invention, and FIG. 4B is a side view of the shaft. FIG. 5 is an explanatory diagram of the same operation.

In FIGS. 3, 4 and 5, 4 is a shaft, and 4a is a shaft eccentric portion. Reference numeral 28 is a speed detecting means that works in conjunction with the shaft eccentric portion 4a and the roller piston 6. Reference numeral 6a is a speed detection mark embedded in the inner circumference of the roller piston 6. 24 is a closed casing 2
It is an oil supply pipe that connects the lower part of the lubricating oil 12 and the suction pipe 13. Reference numeral 29 is a slip ring fixed to the cylinder 5.

The operation of the rotary compressor configured as described above will be described below. The speed detecting means 28 is
The relative speed between the vane 7 and the roller piston 6 is detected from the speed and direction in which the speed detection mark 6a passes through the speed detecting means 28.

When the frictional force between the vane 7 and the roller piston 6 increases and the relative speed between the shaft eccentric portion 4a and the roller piston 6 increases, a speed release command S3 is output to the oil supply valve 23. The oil supply valve 23 is opened while detecting the speed release command S3 of the speed detecting means 28 via the slip ring 29. At this time, the oil supply pipe 24 connects the lower lubricating oil 12 in the closed casing 2 with the suction pipe 13, and the high-pressure lubricating oil 12 passes through the oil supply pipe 24, the suction pipe 13 and the suction passage 14. The oil enters the suction chamber 10 in the cylinder 5 having a low pressure and supplies the lubricating oil to the outer circumference of the roller piston 6.

Therefore, by detecting the relative speed between the shaft eccentric portion 4a and the roller piston 6, the lubricating oil is supplied to the outer circumference of the roller piston 6 whenever the frictional force between the vane 7 and the roller piston 6 becomes large. It is possible to prevent abrasion due to lack of lubricating oil on the outer circumference of the roller piston 6, and further, when the lubricating oil is not actually washed out even at the time of start after defrosting, the lubricating oil is not sucked so that reliability and efficiency are high. It can be a rotary compressor.

Further, thermal decomposition of the refrigerant and lubricating oil due to the sliding heat generation of the vane 7 and the roller piston 6 can be prevented, and a highly reliable rotary compressor can be obtained.

As described above, the rotary compressor according to the second embodiment includes the closed casing 2, the lubricating oil 12 stored in the lower portion of the closed casing 2, and the cylinder 5 housed in the closed casing 2. A shaft which is rotatably inscribed in the roller piston 6 by a main bearing 8, a sub bearing 9, a suction chamber 10 and a compression chamber 11 surrounded by a roller piston 6 and a vane 7, a main bearing 8 and a sub bearing 9. 4, a suction pipe 13 that communicates the suction chamber 10 with the cooling system outside the closed casing 2, a lubricating oil 12 inside the lower portion of the closed casing 2 and the oil supply pipe 24 that communicates the suction pipe 13 or the suction chamber 10, and a shaft. 4 and the roller piston 6 or the roller piston 6 and the vane 7.
Since it is composed of the opening in the lubricating oil 12 and the oil supply valve 23 provided between the opening on the suction pipe 13 side, the lubricating oil can be supplied to the outer circumference of the roller piston 6 only when the lubricating oil is insufficient. Not only that, even when the load applied to the vane 7 and the roller piston 6 is large and the frictional force is large when the ambient temperature is high, the sliding heat generation can be reduced by supplying the lubricating oil to the outer periphery of the roller piston 6. .

Therefore, when the lubricating oil is not washed out even at the time of starting after the defrosting operation, the lubricating oil is not sucked to prevent the efficiency from being lowered, and the outer periphery of the roller piston 6 is prevented from being worn due to the lack of lubricating oil. It is possible to prevent the thermal decomposition of the refrigerant and the lubricating oil due to the increase in the sliding heat generation of the roller piston 6 and the roller piston 6, so that the rotary compressor with high reliability and efficiency can be obtained.

[0039]

As described above, in the invention according to claim 1, the cooling system including the compressor, the condenser, the decompression device, and the evaporator, and the compressor is stored in the inner lower part of the closed casing. A lubricating oil, a cylinder housed in the closed casing, a main bearing, a sub bearing, a suction chamber and a compression chamber surrounded by a roller piston and a vane, a suction pipe communicating the suction chamber with the cooling system, An oil supply pipe that communicates the inside of the lubricating oil and the suction pipe or the suction chamber at the inner lower part of the closed casing, a defrosting device that is provided near the evaporator, and a defrosting detection unit that works in conjunction with the defroster and the compressor, Rotate from a refueling valve that is provided between the opening in the lubricating oil of the refueling pipe and the opening on the suction pipe side in conjunction with the defrosting detection means, and a closing command delay means that is interlocked with the refueling valve. Since the compressor is configured, the lubrication oil on the outer circumference of the roller piston may be washed out.When starting after defrosting operation, it is possible to sufficiently lubricate the outer circumference of the roller piston. It is possible to prevent deterioration of reliability due to wear caused by lack of lubricating oil in the contact portion of the roller piston.

In the invention according to claim 2, the closed casing, the lubricating oil accumulated in the lower part of the closed casing, the cylinder, the main bearing, the auxiliary bearing, the roller piston, which are housed in the closed casing, A suction chamber and a compression chamber surrounded by a vane, a shaft rotatably supported by the main bearing and the sub bearing and rotatably inscribed in the roller piston, and the suction chamber and a cooling system outside the hermetic casing communicate with each other. A suction pipe, an oil supply pipe that communicates the inside of the lubricating oil in the lower portion of the closed casing with the suction pipe or the suction chamber, and speed detection means that works in conjunction with the shaft and the roller piston or the roller piston and the vane. Interlocking with the speed detecting means, provided between the lubricating oil inner opening of the oil supply pipe and the suction pipe side opening. Since the rotary compressor is composed of the oil supply valve and the oil supply valve, the friction coefficient between the vane and the roller piston increases, and when the frictional force increases as the relative speed between the shaft eccentric part and the roller piston increases, the roller piston is always Therefore, when starting after the defrosting operation, the lubricating oil is supplied to the outer circumference of the roller piston and the contact part between the vane and the roller piston only when the lubricating oil is actually washed out, and the defrosting is performed. In addition to after operation, the outer circumference of the roller piston and the wear of the contact area between the vane and roller piston are prevented from wearing out due to insufficient lubrication oil. The faster the friction is, the better the cooling between the vane and roller piston is always possible. Refrigerant due to the temperature rise, the thermal decomposition of the lubricant that can be prevented, can be a reliable and efficient rotary compressor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the rotary compressor.

FIG. 3 is a vertical sectional view of a rotary compressor according to a second embodiment of the present invention.

FIG. 4A is a front view of a roller piston of the rotary compressor, and FIG. 4B is a side view of a shaft of the rotary compressor.

FIG. 5 is an operation explanatory view of the rotary compressor.

FIG. 6A is a vertical sectional view of a conventional rotary compressor, and FIG. 6B is a sectional view taken along line AA in FIG. 6A of the rotary compressor.

[Explanation of symbols]

 1 Compressor 2 Closed casing 4 Shaft 5 Cylinder 6 Roller piston 7 Vane 8 Main bearing 9 Secondary bearing 12 Lubricating oil 13 Suction pipe 20 Evaporator 21 Defroster 22 Defrosting detector 23 Oil supply valve 24 Oil supply pipe 25 Closing command delay means 26 Condensation Vessel 27 decompression device 28 speed detection means

Claims (2)

[Claims] 1. A cooling system including a compressor, a condenser, a decompression device, and an evaporator, lubricating oil stored in an inner lower portion of a hermetic casing of the compressor, and a cylinder housed in the hermetic casing. A suction chamber and a compression chamber surrounded by a main bearing, a sub-bearing, a roller piston and a vane, a suction pipe communicating the suction chamber with the cooling system, the inside of the lubricating oil inside the closed casing, and the suction pipe or An oil supply pipe that communicates with the suction chamber, a defroster provided near the evaporator, a defrosting detector that works with the defroster and the compressor, and a lubricating oil for the oil supply pipe that works with the defroster. A rotary compressor having a refueling valve provided between an inner opening and the suction pipe side opening, and a closing command delaying device that works in conjunction with the refueling valve. 2. A hermetic casing, a lubricating oil accumulated in a lower portion of the hermetic casing, a cylinder housed in the hermetic casing, a main bearing, an auxiliary bearing, a roller piston, and a suction chamber surrounded by a vane and a compression. A chamber, a shaft rotatably supported by the main bearing and the sub bearing, and rotatably inscribed in the roller piston; a suction pipe communicating the suction chamber with a cooling system outside the hermetic casing; and a hermetic casing An oil supply pipe that connects the inside of the lubricating oil to the suction pipe or the suction chamber;
A speed detecting unit that operates in conjunction with the shaft and the roller piston or the roller piston and the vane, and is provided between the lubricating oil inside opening of the oil supply pipe and the suction pipe side opening that operates in conjunction with the speed detecting unit. A rotary compressor having an oil supply valve.