JPH04143486A - Rotary compressor - Google Patents

Abstract

PURPOSE:To prevent drop of volume efficiency and increase in the compressing power and enhance the reliability by furnishing an oil sump leading from a guide pipe to the gap of spring in the neighborhood of an aux. bearing, and providing a communication hole leading from the oil sump to the space with regrigerant gas. CONSTITUTION:When the refrigerant gasified during transportation till an oil sump 19c comes into the chamber 19c, the refrigerant moves up in the lubricant due to buoyancy without being affected by agitation due to rotation and flows out to the refrigerant gas space 1a through a communication hole 19e. The lubricant 17 in the oil sump 19c intrudes again into the gap 19d between a guide pipe 19a and a spring 19b through the pumping action with rotation of the spring 19b and flows out to the refrigerant gas space 1a upon passing through grooves 3e, 3f, 3d. At this time, lubricant is fed to clearances 18a, 18b, 18c between the main bearing 7 and main shaft 3a, between aux. bearing 8 and aux. shaft 3b, and between roller 5 and crank 3c, respectively. The lubricant having reached the internal circumference of the roller 5 makes the roller end faces lubricated through the action of differential pressure, attains the suction chamber 11a and compression chamber, and is discharged to the space 1a from the discharge hole 15.

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 sealed casing having a refrigerant gas space 1a, 2 is an electric motor section, and a cylinder 4. Roller 5. 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 is composed of a rotor 2a, a stator 2b, and Palanne weights 2d and 2e. The shaft 3 consists of a main shaft 3a, a subshaft 3b, and a crank 3C that is eccentric by E from the axes of the main shaft 3a and subshaft 3b. Also, the main axis 3I of shaft 3! 1 and the subshaft 3b each have a groove 3d,
3e, and a groove 3f is further provided in the crank 3C. 10 is a spring provided on the back side of the vane. 1
1a.

11b is inside the cylinder 4 and includes a roller 6, a vane 6°, a main bearing 7. These are 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.

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 which 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 rear runnes 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.
It is guided further and reaches the suction chamber 11a inside the cylinder 4. The refrigerant that has reached the suction chamber 11a is gradually compressed by the rotational movement of the shaft 3 as the electric motor section 2 rotates, in a compression chamber 11b partitioned by a roller 6 and a vane 6, which are rotatably housed in the crank 3C of the shaft 3. After being once discharged into the closed casing 1 through the discharge hole 15 to be compressed, it is discharged through 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 flows into the groove se in the guide pipe 2a near the countershaft 3b as the spring 12b fixed to the countershaft 3b of the oil supply mechanism 12 rotates. , 3f , 3c
l passes through and flows out into the refrigerant gas space 1a. At this time, the pressure is supplied to the clearance 18 between the main bearing 7 and the main shaft 3a, the sub-bearing 8 and the sub-shaft 3b, and the clearance 18c between the crank 3C and the roller 5. After lubricating the suction chamber 11a,
It reaches 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 from the oil supply mechanism to the clearance between the main bearing, the roller, and the shaft, but the lubricating oil accumulated at the bottom of the sealed casing is filled with refrigerant. Since the melt is contained, when the spring fixed to the subshaft rotates within the guide tube, the refrigerant contained in the melt is gasified by stirring, and it is supplied together with the 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. Equipment 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 from the end surface of the roller, reducing the volume. There has been a problem that the efficiency decreases due to a decrease in efficiency and compression power and an increase in compression power. 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 in that not only the gas but also the lubricating oil escaped, resulting in a deterioration in 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 The present invention provides an oil reservoir near the sub-bearing that communicates with the gap between the guide tube and the spring, and further provides a communication hole that communicates the oil reservoir and the refrigerant gas space. .

According to the above-described structure, the lubricating oil conveyed through the guide pipe by the rotation of the spring first reaches the oil sump chamber, but at this time, the gas refrigerant discharged from the lubricating oil enters the oil sump chamber. Freed from the rotational action of the spring, only light gas collects in the upper part of the oil sump chamber and is discharged from the communication hole. Therefore, the lubricating oil that flows through the guide tube toward the sub-bearing side due to the rotation of the spring again contains less gas refrigerant, improving efficiency and reliability.

Example An embodiment of the present invention will be described 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. Reference numeral 1'9 denotes an oil supply mechanism, which is composed of a guide pipe 19a and a spring 19b. The guide tube 19a has one end fixed to the sub-bearing 8, the other end opening into the lubricating oil 17, and has an oil reservoir chamber 19C in the vicinity of the sub-bearing 8. The spring 19b has one end fixed to the subshaft 3b and the other end fixed to the lubricating oil 17.
It is held inside the guide tube 19a.

The oil reservoir chamber 19c communicates with a gap 19d between the guide tube 19a and the spring 19b, and the cross-sectional area of the oil reservoir chamber is set to be larger than other parts of the guide tube 19a. A communication hole 19e is formed in the vertical upper part of the oil reservoir chamber 19c, and communicates the oil reservoir chamber 19c with the refrigerant gas space 1a.

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

Further, the lubricating oil 17 in which the refrigerant is dissolved is conveyed through the guide pipe 9a as the spring 19b rotates, as in the conventional case, and reaches the oil reservoir chamber 19c. Here, the cross-sectional area of the oil reservoir chamber 19C is larger than the cross-sectional area of the guide pipe 19a leading thereto, and the oil reservoir chamber 19c is temporarily released from the influence of the rotation of the spring 19b. Therefore, when the gasified refrigerant enters the oil sump chamber 19c during the transportation process to the oil sump chamber 19c, it moves upward in the lubricating oil due to buoyancy without being affected by rotational agitation, and then flows through the communication hole. The refrigerant gas flows out from 19e into the refrigerant gas space 1a. Furthermore, the lubricating oil 17 in the oil reservoir 19c enters the gap 19d between the guide pipe 19a and the spring 19b again due to the pumping action caused by the rotation of the spring 19b, and then passes through the grooves 3e, af, and 3d between the refrigerant gas and nitrogen. Flows into 1a. At this time, the main bearing 7 and the main shaft 3a
, lubricating oil is supplied to clearances 18a, 18b, and 18c between the subbearing 8 and the subshaft 3b, and between the roller 6 and the crank 30. Further, the lubricating oil that has reached the inner circumference of the roller 5 lubricates the end face of the roller due to the differential pressure, and then enters the suction chamber 11a.

The refrigerant reaches the compression chamber 11b and is then discharged through the discharge hole 15 into the refrigerant gas space 1a.

Therefore, the refrigerant gas is stored in the oil supply mechanism 19, and the supply of lubricating oil is not obstructed, and the oil supply can be performed continuously.

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. Further, from the end surface of the roller 6, the suction chamber 11a,
The amount of refrigerant that enters the compression chamber 11b is also reduced, improving volumetric efficiency, and power loss due to leakage is also reduced, 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, a lubricating oil stored in the lower part of the sealed casing, a cylinder housed in the sealed casing, and a lubricant at both ends of the cylinder. A fixed main bearing and sub-bearing, a shaft that rotates and slides within the main bearing and sub-bearing and is composed of the main shaft, sub-shaft, and crank; one end is fixed to the sub-bearing and the other end opens into lubricating oil. a spring whose one end is fixed to the sub-shaft and whose other end extends into the lubricating oil and is housed within the guide tube; and an oil sump chamber located near the sub-bearing and communicating with the gap between the guide tube and the spring. Since it is equipped with a communication hole that connects the oil sump chamber and the refrigerant gas space and opens vertically upward, the oil supply is continuous and lubricating oil with less refrigerant gas is supplied to the sliding parts of the bearing. can improve reliability,
Mechanical losses are also reduced and volumetric efficiency is improved, making it possible to provide a highly reliable and efficient compressor.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a rotary compressor showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of a conventional rotary compressor, and Fig. 3 is a longitudinal sectional view taken along line m-m' in Fig. 2. It is an arrow view. 1... Sealed casing, 1a... Refrigerant gas space, 3... Shaft, 3a...
Main shaft, 3b・river・secondary shaft, 3C・・・・crank,
4...Cylinder, 7...Main bearing, 8...
...Secondary bearing, 17...Lubricating oil, 19a.
・Self: Guide tube, 19b-・Spring, 19c・
...Oil sump room, 19d...Gap, 19e
・・・・・・Communication hole. Name of agent: Patent attorney Akira Okaji and two others 3G-
Crank diagram diagram

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 guide tube with the other end extending into the lubricating oil and housed in the guide tube; an oil sump chamber located near the sub-bearing and communicating with the gap between the guide tube and the spring; A rotary compressor comprising a communication hole that communicates between a storage chamber and the refrigerant gas space and opens vertically upward.