JPS63176691A - Multi cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To prevent compression of fluid, by opening a delivery hole in a bottom bearing part of a compression element, which opens a delivery valve, when operation is started. CONSTITUTION:Rotary compression elements 5, 6, having rollers 12, 13 and vanes 14, 15, are supported by an upper bearing part 16 and a bottom bearing part 17. When operation is started, a delivery valve 21 of the bottom part rotary compression element 6 is curved opening a delivery hole 19. Accordingly, when the operation is started, a liquid component, infiltrating into a cylinder 9, is discharged, without being compressed, into a cup muffler structure 23 from the delivery hole 19 by rotating the roller 13. Consequently, the liquid component in the cylinder can be prevented from liquid compression without being compressed by the roller.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an improvement in a multi-cylinder rotary compressor in which refrigerant compressed in a plurality of cylinders is discharged from separate discharge ports.

(b) Conventional technology A conventional multi-cylinder rotary compressor is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-1059.
The structure is as shown in Japanese Patent No. 92. Here, a conventional example will be explained with reference to this publication. Reference numeral 50 denotes a closed container, in which an electric element 51 is housed on the upper side, and two rotary compression elements 53 and 54 driven by a rotating shaft 52 of the electric element are housed on the lower side. 55 is an intermediate partition plate that partitions the rotary compression elements 53 and 54. The rotary compression element 53.54 has a cylinder 56.57 and a rotating shaft 52.
It is composed of rollers 60 and 61 which rotate inside the cylinder 56 and 57 by eccentric parts 58 and 59 whose rotation angles are shifted by 180 degrees, and an upper bearing part 62 and a lower bearing part 63 which close the opening of the cylinder 56 and 57. ing. The upper bearing part 62 and the lower bearing part 63 are each provided with a discharge hole 64.65 that communicates with the inside of the cylinder 56.57. These discharge holes are connected to discharge valves 66. which are attached to the upper bearing part 62 and the lower bearing part 63, respectively.
It can be opened and closed at 67.

In a multi-cylinder rotary compressor with this structure, each cylinder 56.
The discharge valves 66 and 67 are opened with the refrigerant completely compressed in the refrigerant 57,
This refrigerant is discharged into the closed container 50 to perform the freezing operation.

(c) Problems to be Solved by the Invention However, since the discharge valves 66 and 67 start operating with the discharge holes 64 and 65 closed, the lower part of the cylinder where liquids such as liquid refrigerant and oil tend to accumulate is particularly important. There was a problem that liquid compression etc. were performed within the valve 57, causing damage to the valve and the bearing.

In order to solve the above problem, this invention opens a discharge hole in the lower bearing part that is opened and closed by a discharge valve when the operation is stopped, and the liquid that has entered the lower cylinder is discharged from this discharge hole without being compressed. The purpose of this is to prevent liquid compression from occurring.

(d) Means for Solving the Problems According to the present invention, the discharge hole in the lower bearing portion, which is opened and closed by a discharge valve, is opened at the start of operation.

(E) Function By having the above-described structure, the discharge hole communicating with the inside of the lower cylinder where liquid refrigerant, oil, etc. tend to accumulate when stopped is made so that there is no chamber with a discharge valve, and when the operation is started, The liquid is removed from the cylinder by the rotation of rollers, making it difficult to compress the liquid.

(f) Examples The present invention will be explained below based on the examples shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container having an oil reservoir 2 in which oil is stored at the bottom. Inside this container, an electric element 3 is placed on the upper side, and two rotary compression elements driven by a rotating shaft 4 of this electric element are placed on the lower side. 5 and 6 are stored respectively. 7 is a rotary compression element 5
, 6. Rotary compression elements 5, 6
is a cylinder 8.9, rollers 12 and 13 that rotate inside the cylinders 8 and 9 by eccentric portions 10.11 that are rotated by 180 degrees from each other on the rotating shaft 4, and rollers 12 and 13 that rotate inside the cylinders 8 and 9 in contact with these rollers. Vane 14 partitioned into a high pressure chamber and a low pressure chamber,
15, and an upper bearing portion 16 and a lower bearing portion 17 that close the openings of the cylinders 8 and 9. The upper bearing part 16 and the lower bearing part 17 are provided with discharge holes 18, 19 which communicate with the high pressure chambers in the cylinders 8, 9, respectively. These discharge holes are opened and closed by discharge valves 20 and 21 attached to the upper bearing part 16 and the lower bearing part 17, respectively. This discharge valve is the upper bearing part 1
6 and the cup muffler integrated 2 attached to the lower bearing part 17
2.23 is covered. The upper cup muffler unit 22 is provided with a discharge port 24 that communicates with the inside of the closed container 1. Also, inside the lower cup muffler integral 23 are cylinders 8 and 9.
It communicates with the upper cup muffler unit 22 through a communication hole 25 provided in the upper cup muffler and the intermediate partition plate 7.

The discharge valve 21 attached to the lower bearing part 17 is bent downward to form a gap with the discharge hole 19.

In the multi-cylinder rotary compressor configured in this way, the refrigerant flowing into the cylinders 8 and 9 of the rotary compression elements 5 and 6 is 1
The rollers 12, 13 and the vanes 14, 15 rotate by the eccentric part 10.11 with a rotation angle shifted by 80 degrees, and are compressed by cooperation between the rollers 12, 13 and the vanes 14, 15, and the discharge valve 20.21 is opened to open the discharge hole 18.
19 and is discharged into the cup muffler unit 22, 23.

The refrigerant discharged into the upper cup muffler integral 22 is discharged from the discharge port 24 into the closed container 1, and the refrigerant discharged into the lower cup muffler integral 23 passes through the communication hole 25 and is discharged from the upper cup muffler integral 22. Closed container 1 from outlet 24
discharged inside. The refrigerant in this sealed container is circulated through an external cooling circuit to perform a cooling effect.

Most of the lower rotary compression element 6 was immersed in the oil in the oil reservoir 2 in the sealed container 1, and liquid components such as oil and liquid refrigerant in the oil reservoir 2 easily entered into the cylinder 9 when the engine was stopped. . Therefore, the lower rotary compression element 6 is
The discharge valve 21 attached to the cylinder 7 is oriented so that a gap is formed between the discharge valve 21 and the discharge hole 19 that is opened and closed by this discharge valve, and the liquid that has entered the cylinder 9 at the start of operation is removed. is discharged from the discharge hole 19 into the cup muffler integral 23 without being compressed by the rotation of the roller 13. The curved discharge valve 21 closes the discharge hole 19 with gas pressure when the pressure inside the closed container 1 increases with the rotary compression element 5 at the upper part, and the rotary compression element 6 at the lower part closes the discharge hole 19 when the pressure inside the closed container 1 increases. I am trying to perform compression.

In this invention, the discharge valve 21 of the lower rotary compression element 6 where liquid compression is likely to be performed at the start of operation is bent, and the discharge hole 19 is bent.
By opening the valve, it is possible to prevent the liquid from being compressed, which tends to occur during startup, and to allow compression to occur during operation.

(G) Effects of the Invention In the multi-cylinder rotary compressor of the present invention, the discharge hole in the lower bearing part that is opened by the discharge valve is opened at the start of operation, so liquid components such as liquid refrigerant and oil are discharged when the machine is stopped. Even if the liquid in the lower cylinder is activated when it has entered the cylinder, the liquid in this cylinder is discharged from the discharge hole without being compressed by the rollers, thereby preventing liquid compression.

[Brief explanation of the drawing]

1 and 2 show the present invention, FIG. 1 is a longitudinal sectional view of a multi-cylinder rotary compressor, FIG. 2 is an enlarged view of the main part showing the valve device, and FIG. 3 is a multi-cylinder rotary compressor showing a conventional example. FIG. 2 is a longitudinal cross-sectional view of a rotary compressor. DESCRIPTION OF SYMBOLS 1... Sealed container, 3... Electric element, 4... Rotating shaft, 5.6... Rotating compression element, 7... Intermediate partition plate, 8.9... Cylinder, 10.11 ...Eccentric part, 12.13...Roller, 14, 1.5
...Vane, 16...Upper bearing part, 17...
・Lower bearing part, 18.19...Discharge hole, 20.
21...Discharge valve. Taganito Sanyo Electric Co., Ltd. Representative Patent Attorney Takuji Nishino and 1 other person Figure 1 = 8-

Claims (1)

[Claims] 1. An electric element is housed in the upper side of the closed container, and a rotary compression element is housed in the lower side, and the rotary compression element is connected to a plurality of cylinders via an intermediate partition plate in the axial direction of the rotary shaft, and a rotary compression element to the rotary shaft. A roller that is driven by an eccentric part and rotates along the inner peripheral surface of each cylinder, a vane that contacts the outer periphery of this roller and partitions the inside of the cylinder, and a bearing that is attached to the end surface of this cylinder and seals the inside of this cylinder. In a multi-cylinder rotary compressor, the upper and lower bearing parts each have a discharge hole, and each discharge hole is opened and closed by an independent discharge valve. is a multi-cylinder rotary compressor characterized by being opened at the start of operation.