JPH04179894A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent the lowering of volumetric efficiency and the increase in compressive motive power and improve reliability by providing a communicating tube, where one edge is opened and the other edge is opened to the refrigerant gas space, in the space on the inner diameter side of a spring where one edge is fixed to a countershaft and the other edge reaches into lubricating oil and is also housed in a guide tube. CONSTITUTION:In a communicating tube 19, one edge is communicate with the space 12c on the inner diameter side of a spring 12b, and the other edge is communicated with the refrigerant gas space 1a, and a fixing plate 21 to fix the communicating tube 19 to a guide tube 12b has a communicating hole 21a. When a compressor is operated, though refrigerant gas produced by means of a stirring action accompanied by rotation of the spring 12b is also carried similarly to lubricating oil 17, the lubricating oil 17 having large specific gravity flows on the space 12d side on the outer diameter side of the spring 12b by means of centrifugal force, and the refrigerant gas having small specific gravity remains on the space 12c side on the inner diameter side of the spring 12b. The refrigerant gas remained in the space 12c on the inner diameter side of the spring 12b is exhausted to the refrigerant gas space 1a through the communicating tube 19, and the lubricating oil accompanying less refrigerant gas flowing in the space 12d on the outer diameter side of the spring 12b flows out into the refrigerant gas space 1a through grooves 3e, 3f and 3d.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in a refrigeration cycle or the like, and particularly relates to a structure with good volumetric efficiency, low sliding loss, and highly reliable bearings.

Conventional technology The conventional configuration will be explained using FIGS. 2 and 3.

1 is a hermetic casing having a refrigerant gas space 1a'(H; 2
is an electric motor section, which is connected to cylinder 4 through shaft 3. Roller 6, vane 6, main bearing 7. It is connected to a mechanical part main body 9 constituted by a sub-bearing 8.

The electric motor section 2 includes a rotor 2a, a stator 2b, and balance weights 2d and 2e. The shaft 3 has a main shaft 3a, a sub-shaft 3b, and an E distance from the axes of the main shaft 3a and sub-shaft 3b.
The eccentric crank 3C is correct. Also, shaft 3
Grooves 3d and 3e are provided in the main shaft 3a- and the sub-shaft 3b, respectively.
However, a groove 31 is further provided in the crank 3C. 1
0 is the nup ring provided on the back of the vane. 11a
.

11b is inside the cylinder 4 and includes a roller 6, a vane 6°, a main bearing 7. There is a suction chamber and a compression chamber formed by the sub-bearing 8.

12 is a guide tube 12a fixed to the sub-bearing 8 and a sub-shaft 3;
This is an oil supply mechanism formed by a spring 12b fixed to b. Therefore, the inside of the guide tube 12a has two spaces: a space 12c on the inner diameter side of the spring 12b and a space 12d on the outer diameter side.

13 is a suction pipe, and sub-bearing 8. It communicates with the suction chamber 11a via the suction passage 14 of the cylinder 4.

Reference numeral 16 denotes a discharge hole, which communicates with the refrigerant gas space 1a within the sealed casing 1. Reference numeral 16 denotes a discharge pipe that opens into the sealed casing 1. Reference numeral 17 indicates lubricating oil accumulated in the lower part of the sealed casing 1. Moreover, the main shaft 3a and the main bearing 7. Counter shaft 3b and counter bearing 8. The roller 5 and the crank 3c are rotatably slidable via minute rearances 18a, 18b, and 18c, respectively.

Next, the mechanism of the rotary compressor will be explained. Refrigerant from the cooling system (not shown) is supplied to the suction pipe 13 and suction hole 14.
The refrigerant is guided 71" to the suction chamber 11a in the cylinder 4. The refrigerant that has reached the suction chamber 11a is
In the compression chamber 11b partitioned by the roller 6 and the vane 6, which are rotatably installed, the air is gradually compressed by the rotational movement of the shaft 3 as the electric motor section 2 rotates. Once discharged, the discharge pipe 16
to the cooling system. At this time, the lubricating oil 17 accumulated in the lower part of the sealed casing 1 is moved between the space 12c on the inner diameter side of the spring 12b in the guide tube 2a and the outer diameter due to the rotation of the spring 12b fixed to the subshaft 3bK of the oil supply mechanism 12. The grooves 3e, 3 reach the vicinity of the counter shaft 3b through the side space 12d.
f, 3d, and flows out into the refrigerant gas space 1a. At this time, the clearances 18a and 18b between the main bearing 7 and the main shaft 3a, the sub-bearing 8 and the sub-shaft 3b, and the clearance between the crank 3C and the roller 5, 180, are supplied, and from the circumferential side of the roller 6, differential pressure is applied to the roller end surface. After being lubricated, it reaches the suction chamber 11a and the compression chamber 11b, and is then discharged into the sealed casing 1 from the discharge hole 15.

Problems to be Solved by the Invention In such a conventional configuration, lubricating oil is supplied to the clearance between the main bearing, the roller and the shaft by the oil supply mechanism, but the lubricating oil accumulated at the bottom of the sealed casing is Because the refrigerant is in the solution, when the spring fixed to the subshaft rotates in the guide tube, it causes stirring! The refrigerant contained in the ll bath is gasified, and it is supplied together with lubricating oil. When gasified refrigerant accumulates in the guide tube, it obstructs the inflow of lubricating oil, making it impossible to continuously supply lubricating oil, which deteriorates the lubrication between the main bearing, sub-bearing, rollers and shaft, reducing reliability. Mechanical loss at each sliding part increases. In addition, the gasified refrigerant gas enters the inner circumferential side of the roller through the gap and groove between the subshaft and the subbearing, and a large amount of the refrigerant gas flows into the compression chamber and suction chamber through the end surface of the roller. Problems such as reduction in efficiency due to reduction in volumetric efficiency and increase in compression power have frequently occurred. As a countermeasure to this, it is possible to create a hole in the guide tube to release gas, but simply providing a hole will cause all the fluid in the space between the spring and the guide tube to escape. There was a problem that not only the 9 gas but also the lubricating oil escaped, resulting in deterioration of the oil supply characteristics.

The present invention solves the above-mentioned drawbacks of the conventional example, and aims to prevent a decrease in volumetric efficiency and an increase in compression power, and further improve reliability.

Means for Solving the Problems In the present invention, a communication pipe is provided, one end of which opens in the space on the inner diameter side of the spring, and the other end opens into the refrigerant gas space.

Operation The present invention has the above-described configuration, and since the lubricating oil has a large specific gravity among the mixed fluid of the lubricating oil conveyed in the υ guide tube by the rotation of the spring and the refrigerant gas generated by stirring, the centrifugal force caused by the rotation of the spring The refrigerant gas flows through the space on the outside diameter side of the spring, while the refrigerant gas has a light specific gravity, so it accumulates in the space on the inside diameter side of the spring and is then discharged into the refrigerant gas space via the communication pipe. Therefore, mainly only the refrigerant gas out of the mixed fluid in the guide tube can be discharged, and lubricating oil with less refrigerant gas can be supplied to the sliding parts, thereby improving efficiency and reliability.

Example A simple embodiment of the present invention will be explained below with reference to FIG.

Note that the same parts as in the conventional example are given the same reference numerals and detailed explanations are omitted. 19 is a communication pipe, one end of which communicates with the space 12c on the inner diameter side of the panel 12b, and the other end of which communicates with the refrigerant gas space 1a. 2o is a fixing plate for fixing the communication tube 19 to the guide tube 12b, and has a communication hole 20a.

In such a configuration, when the compressor is operated, the suction pipe 13
The refrigerant gas sucked in is discharged from three discharge pipes 16 as in the conventional case.

Further, as in the conventional case, as the spring 12b rotates, the lubricating oil 17 in which the refrigerant is dissolved flows through the communication hole 20a'i of the fixed plate 2o to the space 12c on the inner diameter side of the spring 12b in the guide pipe 2a.
and is conveyed through the space 12d on the outer diameter side and reaches the vicinity of the sub-bearing 8. At this time, the refrigerant gas generated by the stirring action caused by the rotation of the spring 12b is also transported in the same way as the lubricating oil 17, but the lubricating oil 17 with a large specific gravity is transferred to the space on the outer diameter side of the spring 12b due to the centrifugal force caused by the rotation of the spring 12b. The refrigerant gas that flows on the 12d side and has a light specific gravity flows into the space 12 on the inner diameter side of the spring 12b.
It will accumulate in C1llll. The refrigerant gas accumulated in the space 12C on the inner diameter side of the spring 12b is discharged to the refrigerant gas space 1a via the communication pipe 19. Also, spring 12
Grooves 3e and 3f are provided in the lubricating oil with less refrigerant gas flowing through the space 12d on the outer diameter side of b.

3di passing refrigerant gas flows out to 1v11a. At this time, the main bearing 7 and the main shaft 3a, and the sub-bearing 8 and the sub-shaft 3b.

Roller 5 and crank 3C dark clearance 18a.

Lubricating oil is supplied to 18b and 18C. Also, roller 6
The lubricating oil that has reached the inner periphery of the roller lubricates the end face of the roller due to the differential pressure, then reaches the suction chamber 11a and the compression chamber 11b, and is then discharged from the discharge hole 15 into the refrigerant gas space 1a.

Therefore, the refrigerant gas does not accumulate in the oil supply mechanism 12 and obstruct the supply of lubricating oil, allowing continuous oil supply and reducing the clearance 18a.

Lubricating oil containing almost no refrigerant gas is supplied to the end surfaces of 18b, 18C and the roller 5, reducing mechanical loss and improving reliability. The amount of refrigerant that enters the suction chamber 11a and the compression chamber 11b from the end face of the E-reading roller 6 is also reduced, improving the volume yJ ratio, and reducing power loss due to leakage, making it possible to provide a highly reliable and efficient compressor. .

Effects of the Invention As is clear from the above description, the present invention includes a sealed casing having a refrigerant gas space, lubricating oil stored in the lower part of the sealed gas casing, a cylinder housed in the sealed casing, and a cylinder. The main bearing and sub-bearing are fixed at both ends, and the rotating main shaft, sub-shaft, and crank rotate within the main bearing and sub-bearing! A shaft, a guide tube having one end fixed to the sub-bearing and the other end opening into the lubricating oil, and a spring having one end fixed to the sub-shaft, the other end extending into the lubricating oil, and housed in the guide tube. Since it is equipped with a communication pipe with one end opening in the space on the inner diameter side of the spring and the other end opening in the refrigerant gas space, lubrication is continuous and the sliding part of the bearing is lubricated with less refrigerant gas. It is possible to supply oil, improve reliability, reduce mechanical loss, improve volumetric efficiency, and provide a highly reliable and efficient compressor.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a rotary compressor showing the implementation of the present invention, Fig. 2 is a longitudinal cross-sectional view of a conventional rotary compressor, and Fig. 3 is taken along the m-m' line in Fig. 2. FIG. 1... Sealed casing, 1a... Refrigerant gas space, 3... Shaft, 3a...
Main shaft, 3b... Subshaft, 3C... Crank, 4... Cylinder, 7... Main bearing,
8... Secondary bearing, 12a... Guide pipe,
12b...Spring, 12C...Empty (8) on the inner diameter side of the spring, 19...Communication pipe. Name of agent: Patent attorney Akira Okaji and 2 others Figure 2! -Summer□ Figure 3

Claims (1)

[Claims] a sealed casing having a refrigerant gas space, lubricating oil stored in the lower part of the sealed casing, a cylinder housed in the sealed casing, a main bearing and a sub bearing fixed to both ends of the cylinder, and the main bearing. a shaft that rotates and slides within a bearing and a sub-bearing and is composed of a main shaft, a sub-shaft and a crank; a guide tube having one end fixed to the sub-bearing and the other end opening into the lubricating oil; and one end fixed to the sub-shaft. a spring fixed to the spring, the other end of which extends into the lubricating oil and is housed in the guide tube, and a communication tube that has one end opening in a space on the inner diameter side of the spring and the other end opening in the refrigerant gas space. Rotary compressor with.