JPS62195484A - Discharge valve device of rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the top clearance by varying each spring constant of a plurality of specific independent discharge valves and opening only the discharge valve having a small spring constant in the low speed operation and accumulating the oil into the discharge poort closed by the discharge valve having a large spring constant. CONSTITUTION:The span of a discharge valve 13 installed into an upper bearing part 9 is made longer than that of a discharge valve 14 in a lowre bearing part 10, and the spring constant is made less, and in the low speed operation, only the discharge valve 13 in the upper bearing part 9 is opened. Oil is collected into the discharge port 12 in the lower bearing part 10 closed by the discharge valve 14 having a large spring constant, and the reduction of the top clearance of the discharge port 12 which is not opened is permitted. Since the top clearance in the low speed revolution is reduced, the result factor of a rotary compressor can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field This invention relates to the improvement of a discharge valve device of a rotary compressor. It is configured as shown.

Here, a conventional example will be explained with reference to this publication. In FIG. 4, 50 is a closed container, and this container FF3 houses an electric element 51 on the upper side and a rotary compression element 52 on the lower side. The rotary compression element 52 includes a cylinder 53, a roller 56 rotated by an eccentric portion 55 of a rotating shaft 54, and a cylinder 53 in contact with this roller. It is composed of a vane 57 that divides the cylinder 53 into a high-pressure chamber and a low-pressure chamber, and an upper bearing s58 and a lower bearing 59 that open and close the cylinder 53. Reference numerals 60 and 61 indicate discharge boats that are bored in the lower bearing portion 58 and the lower bearing portion 59, respectively, and these discharge boats are opened and closed by independent discharge valves 62 and 63, respectively. Reference numerals 64 and 65 designate integrated cup mufflers that cover the discharge valves 62 and 63, and these integrated cup mufflers are attached to the upper bearing portion 5B and the lower bearing portion 59, respectively. 66 is a passage provided in the cylinder 53, and this passage communicates with both cup mufflers. 67 is an auxiliary cooler provided outside the closed container 50, and this auxiliary cooler is connected to the passage 66 and 1! of the closed container 501F3. The space 68 between the compression element 51 and the rotary compression element 52 is communicated with each other.

In this structure, the refrigerant compressed by the cylinder 531'i is transferred to a discharge boat 6 provided in the lower bearing part 58 and the lower bearing part 59.
Discharge from 0.61 to 64°65 yen with the cup muffler, and the passage area of the discharge boat 60.61? Isn't the height so that this discharge boat does not become a resistance to the compressed refrigerant? 1. Problems to be Solved by the Invention However, the two independent discharge valves 62 and 63 provided on the single rotary compression element 52 open and close simultaneously during operation. Therefore, a rotary compressor driven at a variable speed by an inverter or the like has a problem in that the coefficient of performance deteriorates due to the influence of the top clearance due to the discharge boat 60, 61 during low speed operation.

In order to solve the above-mentioned problems, this invention changes the spring constant of the discharge valves that open and close the plurality of discharge boats. The purpose is to improve the coefficient of performance during low-speed continuous rotation by opening the valve.

B) Means for Solving the Problems In this invention, the spring constants of independent discharge valves that open and close a plurality of discharge ports are changed.

(4) Effect This invention changes the spring constant of each independent discharge valve, so that one discharge valve is opened during low-speed operation, and only one discharge valve is opened.
Liquids such as oil are stored in the discharge boat that is not opened, thereby reducing the top clearance caused by the discharge boat that is not released.

(f) Example The present invention will be described below based on the example shown in FIGS. 1 and 2.

Reference numeral 1 denotes a closed container, inside this container there is an electric element 2 driven at a variable speed by an inverter on the upper side, and this t on the lower side.
Rotary compression elements 4 rotated by the rotation shaft 3 of the vI element are respectively housed. The rotary compression element 4 is a cylinder 5
, a roller 27 rotated in the cylinder 5 by the eccentric center 6 of the rotating shaft 3, and a cylinder SP in contact with this roller.
'3Y It is composed of a vane 8 that divides into a high chamber and a low pressure chamber, and an upper bearing section 9 and a lower bearing section 10 that close the opening of the cylinder 5. Reference numerals 11 and 12 indicate discharge boats that are bored in the upper bearing part 9 and the lower bearing part 10, respectively, and these discharge boats are opened and closed by independent discharge valves 13 and 14, respectively. The discharge valve 13 attached to the lower bearing part 9 has a longer span than the discharge valve 14 attached to the lower bearing part 10. Therefore, the discharge 9F13 of the lower bearing part 9 is
The spring constant is smaller than that of the discharge valve 14 of 110. 15.1
6 is an integrated cup muffler that covers the discharge valves 13 and 14'.
This cup muffler has upper bearing B9 and lower bearing $10 respectively.
It is attached to. 17 is a passage provided in the cylinder 5 and opened to the lower bearing part 100 and the cup muffler integrated 16173, and this passage is connected to the U-shaped pipe 18 provided outside the closed container 1.
The electric element 2 and the rotary compression element 4 in this closed container are connected via
It communicates with the space 19 between. 20 is the upper bearing 890
This is a discharge port provided in the power pump 1 and flier 15.

In the discharge valve device of the rotary compressor configured in this way, the refrigerant that has flowed into the cylinder 5 is compressed by the cooperation of the rollers 7 and vanes 8, and then flows from the discharge boat 11.12 into the muffler integral 15.16. Each circle has a discharge valve 13.14
=2 Open and flow in.

The refrigerant of 15 yen integrated with the cup muffler of the lower bearing part 9 is discharged from the outlet 2.
The refrigerant in the cup muffler integral 16 of the lower bearing part 10 is discharged into the space 19173+' through the passage 17 and the U-shaped vibe 18. : Discharge n. and,
The combined refrigerant passes through the electric element 2 and is discharged from above the closed container 1 to the outside.

The discharge valve 13 attached to the upper bearing part 9 has a longer span length (and has a smaller spring constant) than the discharge valve 14 of the lower bearing part 10, so that only the discharge valve 13 of the lower bearing part 9 is attached during low-speed operation. is opened, and oil is stored in the discharge boat 12 of the lower bearing portion 10 that is closed by the discharge valve 14. This reduces the top clearance of this discharge boat and improves the coefficient of performance. In addition, during high-speed operation, the rotation of the roller 7, which compresses the refrigerant at a cylinder speed of 5 yen, is fast (and both the discharge valves 13 and 14 are opened, i.e.,
Discharge valve 13.144! During high-speed rotation, overcompression due to the delay in opening the valve increases, and even if there is a slight difference in spring constant due to the difference in span length, the valves open almost simultaneously. In addition, in the above explanation, the spring constant is determined by changing the span length of the discharge ff13.14. As explained above, the thickness of the valve plate may also be changed.

(G) Effects of the Invention This invention changes the spring constant of the independent discharge valves that open and close the plurality of discharge ports, so that only the discharge valve with a small spring constant is opened during low-speed operation.
Top clearance during low-speed operation can be reduced by storing oil in a discharge boat that is closed by a discharge valve with a large spring constant. Moreover, since the top clearance is reduced during low speed operation, the coefficient of performance of the rotary compressor can be improved.

[Brief explanation of drawings]

Figures 1 and 2 show this invention, Figure 1 is a cross-sectional view of the main parts of a rotary compressor, Figure 2 is an enlarged cross-sectional view of the main part of a discharge valve device, and Figure 3 is a diagram showing the coefficient of performance and frequency. FIG. 4 is a longitudinal sectional view of a conventional rotary compressor. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Electric element, 4... Rotating compression element, 11.12... Discharge port, 13
゜14...Discharge valve. Applicant: Sanyo Electric Co., Ltd. (1 person) Representative: Shizuo Sano Figure 1

Claims (1)

[Claims] 1. An electric element driven at a variable speed by an inverter or the like and a rotary compression element rotated by the electric element are housed in a closed container circle, and the rotary compression element is provided with a plurality of discharge ports. 1. A discharge valve device for a rotary compressor, wherein the rotary compressor is opened and closed by independent discharge valves, wherein each of the discharge valves has a different spring constant.