JP3533688B2 - Rotary compressor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used for refrigerating a refrigerator or air-conditioning an air conditioner.

[0002]

2. Description of the Related Art In a rotary compressor using a piston and a vane, contact pressure between the two is extremely high and one or both of the piston and the vane may be worn. It was For example,
In Japanese Utility Model Laid-Open No. 57-120787 (FIG. 8), a structure for reducing the rotation of the piston is used to reduce the sliding between the two to reduce wear.

[0003]

However, due to the problem of protection of the global environment (prevention of destruction of the ozone layer), from the conventional chlorine-containing refrigerant (CFC, HCFC refrigerant) to chlorine-free refrigerant (HFC refrigerant). The need has changed. When a chlorine-free refrigerant is used, the refrigerant itself does not have lubricity.Therefore, if a rotary compressor with the above structure is used, the lubrication between the vane tip and the piston is insufficient, and the sliding part The friction generated heat and increased wear, resulting in problems with durability.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by improving the lubrication between the tip of the vane and the piston to reduce the progress of wear even when a chlorine-free refrigerant is used. The purpose is to provide.

[0005]

In order to solve the above problems, the first technical means according to the present invention is such that a piston is fitted on the outer peripheral surface of a crankshaft directly connected to an electric motor and is slidable on a cylinder. The tip of the vane fitted to the abutment is brought into contact with the piston to divide the inside of the cylinder into a suction chamber and a compression chamber,
In the rotary compressor in which the piston swings due to the rotation of the crankshaft and the vane reciprocates to repeat gas suction, compression, and discharge, at the tip of the wall surface of the vane on the suction chamber side,
That is, a plurality of holes are provided in the thickness direction of the vane.

A second technical means according to the present invention is, in a rotary compressor similar to that described above, provided with a passage in the vane, and guiding a part of the gas flowing through the suction passage to the passage of the vane, That is, a part of the gas is allowed to flow into the suction chamber through the end portion.

A third technical means according to the present invention is, in a rotary compressor similar to that described above, provided with a passage in the vane and guiding the refrigerant liquid from the intermediate pressure portion of the refrigeration cycle to the passage of the vane. That is, the refrigerant liquid is allowed to flow into the compression chamber via the tip of the.

[0008]

The operation of the first means of the present invention will be described. Sliding friction heat is generated between the vane and piston,
Friction heat escapes from the holes formed at the tip of the vane to the refrigerant gas having a low temperature, and the temperature rise at the tip of the vane is suppressed. As a result, the temperature rise of the oil interposed between the vane tip and the piston can be suppressed, so that the viscosity of the oil does not decrease,
Good lubrication is maintained and wear on the vane tip and piston surface is reduced.

Next, according to the second means of the present invention,
A part of the refrigerant gas sucked into the suction chamber bypasses the passage provided in the vane and flows into the suction chamber through the tip of the vane.The bypassed refrigerant gas effectively cools the tip of the vane. To be done. As a result, a good lubrication state between the vane and the piston is maintained, and wear of both is reduced.

Next, according to the third means of the present invention,
Since the refrigerant liquid passes through the passage provided in the vane and flows into the compression chamber via the tip of the vane, the vane tip is cooled more effectively by the evaporation action of the refrigerant liquid. As a result, the lubrication state between the vane and the piston is improved, and the wear of both is significantly reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the rotary compressor according to the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a closed container, 2 is a crankshaft, and an electric motor (not shown) is directly connected to the crankshaft 2. A piston 3 is rotatably fitted to the outer peripheral surface of the crankshaft 2. Reference numeral 4 is a cylinder, and 5 is a vane, which is slidably fitted in the groove 6 of the cylinder 4. A spring 7 is provided on the back surface of the vane 5, and the tip of the vane 5 is brought into contact with the piston 3 to separate the space inside the cylinder 4 into a suction chamber 8 and a compression chamber 9. Reference numeral 10 is a suction passage, and 11 is a discharge port.

Next, the operation of this compressor will be described. When the crankshaft 2 rotates in the direction of the arrow A, the refrigerant gas is sucked into the suction chamber 8 through the suction passage 10, while the compression / discharge process proceeds in the compression chamber 9 and the function as the compressor is exerted. . At this time, the piston 3 is generally pulled by the rotation of the crankshaft 2 and slowly rotates in the direction A.

Further, since the tip of the vane 5 is in linear contact with the piston 3, the contact pressure is extremely high, and it is difficult to realize fluid lubrication at this sliding portion, but the conventional refrigerant gas containing chlorine is used. At times, due to the lubricating effect of the refrigerant itself (formation of iron chloride film on the metal surface), barely,
Friction and wear of the sliding parts were kept low.

However, when a chlorine-free refrigerant is used, the above-mentioned lubrication effect cannot be obtained, so the tip of the vane 5 comes into direct contact with the surface of the piston 3 to generate heat and the temperature rises, resulting in friction and friction. The wear had increased. As a result, the rotation of the piston 3 disappeared, and the wear of both was rapidly progressing.

Therefore, in the present invention, as shown in FIG.
A plurality of deep holes 12 are provided on the surface of the vane 5. The hole 12 is provided at the tip of the wall surface of the vane 5 so as to face the suction chamber 8. Therefore, the area in contact with the intake gas having a low temperature is wide at the tip of the vane 5. Sliding frictional heat is generated between the vane 5 and the piston 3 during operation, but this frictional heat is efficiently dissipated from the holes 12 to the refrigerant gas having a low temperature, and the rise in temperature at the tip of the vane 5 is suppressed.
As a result, the temperature rise of the oil interposed between the tip of the vane 5 and the piston 3 is suppressed, so that the decrease in the viscosity of the oil is reduced, a good lubricating state is maintained, and even when a non-chlorine refrigerant is used. Piston 3 and vane 5
Wear on the tip is reduced.

Next, according to the second means of the present invention, the third means
And, as shown in FIG. 4, a passage 13 is provided inside the vane 5. The passage 13 is connected from the central portion of the vane 5 to the wall surface of the tip portion, and the wall surface of the tip portion opens into the suction chamber 8. Further, the cylinder 4 has an auxiliary passage 14 connecting the suction passage 10 and the passage 13 provided in the vane.
Is provided. Therefore, part of the suction gas sucked into the suction chamber 8 through the suction passage 10 flows into the suction chamber 8 through the auxiliary passage 14 and the passage 13 in the vane 5. At this time, the suction gas flowing through this path effectively cools the tip portion of the vane 5. As a result, as in the case of the first means, the temperature rise of the oil interposed between the tip of the vane 5 and the piston 3 is suppressed, the decrease in the viscosity of the oil is reduced, and a good lubricating state is maintained, Even when a chlorine-free refrigerant is used, the wear of the piston 3 and the tip of the vane 5 is reduced.

Next, according to the third means of the present invention, as shown in FIGS. 5, 6 and 7, a passage 15 is provided at the tip of the vane 5 and an intermediate pressure portion of the refrigeration cycle (not shown). The refrigerant liquid is extracted from the (1) and is guided to the passage 15 provided at the tip of the vane 5 through the liquid injection pipe 16 and the auxiliary passage 18 provided in the lower bearing 17. As shown in FIG. 7, this passage 15 is connected to the compression chamber 9 by a plurality of holes provided in the wall surface of the vane 5. Therefore, the refrigerant liquid guided to the passage 15 of the vane 5 evaporates in the passage 15 to more effectively cool the tip of the vane, and then enters the compression chamber 9. as a result,
The temperature rise of the oil interposed between the tip of the vane 5 and the piston 3 can be suppressed more effectively than in the case of the first or second means. As a result, the decrease in the viscosity of the oil is reduced, a good lubricating state is maintained, and the wear of the piston 3 and the tip of the vane 5 is significantly reduced even when a non-chlorine refrigerant is used.

[0019]

The effects of the present invention will be described. In the rotary compressor, according to the first means of the present invention, since the plurality of holes are provided in the vane in the thickness direction of the vane at the tip of the wall surface of the vane on the suction chamber side, the vane tip is moved by the suction refrigerant gas. It can be cooled and the temperature rise at the tip can be suppressed. As a result, the temperature rise of the oil interposed between the vane tip and the piston can be suppressed, so that the viscosity of the oil does not decrease and a good lubricating state is maintained.
Wear on the vane tip and piston surface is reduced.

According to the second means of the present invention, part of the refrigerant gas sucked into the suction chamber bypasses the passage through the passage provided in the vane, passes through the tip of the side wall of the vane, and then flows into the suction chamber. Because it dents, this bypassed refrigerant gas
The vane tip is effectively cooled. As a result, an oil film is reliably formed between the vane and the piston, a good lubrication state is maintained, and wear of both is reduced.

Next, according to the third means of the present invention, the refrigerant liquid passes through the passage provided in the vane, flows through the tip of the wall surface of the vane, and then flows into the compression chamber, so that the vane is evaporated by this refrigerant liquid. The tip is cooled more effectively. As a result, the lubrication state between the vane and the piston is improved, and the wear of both is significantly reduced.

As described above, according to the present invention, it is possible to provide a rotary compressor having a relatively simple structure, which reduces wear of pistons and vanes even when a chlorine-free refrigerant is used, and which has high durability. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a rotary compressor according to an embodiment of the present invention.

FIG. 2 is a detailed perspective view of the vane.

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

FIG. 4 is a detailed perspective view of a vane according to another embodiment of the present invention.

FIG. 5 is a sectional view showing a rotary compressor of another embodiment of the present invention.

FIG. 6 is a vertical sectional view of the rotary compressor.

FIG. 7 is a detailed perspective view of a vane according to another embodiment of the present invention.

FIG. 8 is a sectional view showing a conventional rotary compressor.

[Explanation of symbols]

1 closed container 2 crankshaft 3 pistons 4 cylinders 5 vanes 8 Inhalation chamber 9 compression chamber 10 Inhalation passage 12 Holes on the tip of the vane wall Passage in 13 vanes 15 Vane tip passage 16-liquid injection tube

Front page continuation (72) Inventor Hiroyuki Kono 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-5-44671 (JP, A) JP-A-55-148901 (JP , A) JP 57-157091 (JP, A) Actual development 60-66888 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/356 F04C 29/02 331 F04C 29/04

Claims (3)

(57) [Claims] 1. An electric motor and a piston are fitted on the outer peripheral surface of a crank shaft directly connected to the electric motor, and the tip of a vane slidably fitted to a cylinder is brought into contact with the piston.
A rotary compressor in which the inside of a cylinder is divided into a suction chamber and a compression chamber, the piston swings due to the rotation of the crankshaft, and the vane reciprocates to repeat suction, compression, and discharge of gas. A rotary compressor having a plurality of holes facing the suction chamber at the tip of the wall surface on the suction chamber side. 2. A piston is fitted on an outer peripheral surface of an electric motor and a crankshaft directly connected to the electric motor, and a tip of a vane slidably fitted to a cylinder is brought into contact with the piston,
A rotary compressor in which the inside of a cylinder is divided into an intake chamber and a compression chamber, the piston swings due to the rotation of the crankshaft, and the vane reciprocates to repeatedly suck, compress, and discharge gas. A rotary compression system in which a passage is provided and a part of the gas flowing through the suction passage provided in the cylinder is guided to the passage of the vane, and a part of the gas flows into the suction chamber via the tip of the vane. Machine. 3. An electric motor and a piston are fitted on the outer peripheral surface of a crankshaft directly connected to the electric motor, and the tip of a vane slidably fitted to the cylinder is brought into contact with the piston,
A rotary compressor in which the inside of a cylinder is divided into an intake chamber and a compression chamber, the piston swings due to the rotation of the crankshaft, and the vane reciprocates to repeatedly suck, compress, and discharge gas. A rotary compressor, which is provided with a passage, guides a refrigerant liquid from an intermediate pressure portion of a refrigeration cycle to a passage of the vane, and allows the refrigerant liquid to flow into the compression chamber via a tip portion of the vane.