JPS61241487A - Enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To prevent counter flow of high pressure and high-temperature gas in a compressor to a refrigerating system by opening a refrigerant gas passage by means of a spool which forms a check valve mechanism due to flow of refrigerant gas during operation of the compressor and closing the refrigerant gas passage during stoppage of the compressor. CONSTITUTION:During operation of a compressor 1, a spool 16 which forms a check valve mechanism against energizing force of a coil spring 17 by flow of refrigerant gas, is pushed in the direction of flow of the refrigerant gas to open a refrigerant gas passage 23 provided in the spool 16, then a refrigerant gas circuit as a refrigerating system is formed. Next, during stoppage of operation of the compressor 1, flow of the refrigerant gas is stopped, and the spool 16 is pushed by the coil spring 17 to the opposite side of a compressor element 11 and further pushed in the same direction by high temperature and high-pressure gas in an enclosed case 10 leaked from a cylinder part (unillustrated) and the like. As a result, the opening part B of the spool 16 is pushed back from an expanded pipe part 14 to be blocked up by the inner wall face of a case 15 and oil in minute gaps of said wall. Thus, counter flow of high temperature and high-pressure gas in the enclosed case 10 to the refrigerating system can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a hermetic rotary compressor for use in a refrigeration system. .

Conventional technology A conventional refrigeration cycle is shown in FIG.

1 is a hermetic rotary compressor, 2 is a condenser, 3 is a solenoid valve,
4 is a capillary tube, 6 is an evaporator, and 6 is a check valve.

In the above cycle, the reason why the reverse valve 6 is required is as follows.
When the rotary compressor 1 is stopped, high-temperature, high-pressure gas in the compressor 1 leaks from the cylinder to the low-pressure side and flows back into the evaporator 6 through the low-pressure circuit, warming the evaporator 6 and reducing heat loss. This is to prevent this from occurring.

As shown in FIG. 4, the structure of the reverse valve 6 is that a valve 8 and a valve seat 9 are provided in a jacket 7. When the compressor 1 is in operation, the valve 8 is pushed by the flow of refrigerant gas. The structure is such that when the compressor 1 stops operating, the weight of the valve 8 closes the refrigerant gas circuit.

Problems to be Solved by the Invention However, in the above structure, when the check valve 6 is disposed in a low pressure circuit, the refrigerant gas flows vertically and upwardly due to the structure of the check valve 6. It is necessary to construct a circuit, which requires longer piping materials and a larger installation space.

Means for Solving the Problems Therefore, the technical means of the present invention for solving the above-mentioned problems is to provide a cylindrical case having an enlarged tube part in a part of the SAXILON tube and to be able to slide freely inside the case. A check valve mechanism is provided that includes a cylindrical spool having a refrigerant gas passage and a coil spring that biases the spool in a direction to close the refrigerant gas passage when the operation is stopped.

For production The effect of this technical means is as follows.

That is, while the compressor is operating, the spool forming the check valve mechanism is pushed in the flow direction of the refrigerant gas against the biasing force of the coil spring due to the flow of refrigerant gas, and the refrigerant gas passage provided in the spool is opened. Next, when the compressor is stopped, the spool is pushed in a direction opposite to the normal refrigerant gas flow direction by the compressor internal pressure and the coil spring force, and the refrigerant gas passage is closed.

This prevents the high temperature, high pressure gas in the compressor from flowing back into the refrigeration system.

EXAMPLE Hereinafter, a hermetic rotary compressor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a hermetic rotary compressor showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a check valve mechanism portion of the present invention.

In FIG. 1, reference numeral 1 denotes a hermetic rotary compressor (hereinafter referred to as a compressor), which is composed of a hermetic case 10, a compression element 11, and an electric element 12. A suction tube 13 is provided to penetrate through and is fixed in an airtight manner.

A cylindrical case 16 having an enlarged tube part 14 in a part forming a check valve mechanism is disposed in a part of the SAXILON tube 13.
The spool 16 is slidably housed in the case 16, the coil spring 17 biases the spool 16 in a predetermined direction, and the seat 18 for the spool 160 provided in the case 15.
and a filter 19 are provided.

The spool 16 also has one end that is connected to the anti-compression element side end surface 2.
A refrigerant gas passage 23 is provided which has an opening A at one end and an opening B at the other end at a side surface 22 near the compression element side end surface 21, and the spool 16 is connected to the inner wall surface of the case 16 with a minimum clearance. It is loosely fitted.

The compressor configured as described above is shown in Figure 1 below.
Its operation will be explained using FIG.

First, while the compressor 1 is in operation, the spool 16 moves against the compression element 11 against the biasing force of the coil spring 17 due to the flow of refrigerant gas.
Pushed to the side, the compression element side opening B of the refrigerant gas passage 23 provided in the spool 16 is pushed out and opened to the expanded tube portion 14 provided in the case 16, forming a refrigerant gas circuit as a refrigeration system. .

Next, when the compressor 1 stops operating, the flow of refrigerant gas stops, and the coil spring 17 pushes the spool 16 to the side opposite to the compression element 11, and the cylinder part (not shown) that constitutes the compression element 11 is pushed by the coil spring 17. The opening B provided in the spool 16 is pushed in the same direction by the high-temperature, high-pressure gas inside the sealed case 10 leaking from the inside wall of the case 14 and the minimum gap therebetween. Unless it is blocked by the intervening oil, the high-temperature, high-pressure gas in the sealed case 1o can be prevented from flowing back into the refrigeration system.

As described above, a check valve mechanism consisting of a cylindrical spool and a coil spring having a refrigerant gas passage with one end opening on the opposite end face of the compression element and the other end opening on the side face near the compression element side is partially expanded. The refrigerant gas circuit is built into the case that forms part of the Saku Shiron tube, and is operated by the flow of refrigerant gas, the biasing force of a coil spring, and the internal pressure of the sealed case to open and close the refrigerant gas circuit. Like a long pipe.

It is possible to easily prevent heat loss in the refrigeration system by preventing the backflow of high-temperature, high-pressure gas in the sealed case to the refrigeration system when the intended compressor operation is stopped without requiring a large space or installation direction.

Effects of the Invention As described above, the present invention includes a cylindrical case forming a part of a SAXILON tube having a part of the expanded tube, and a cylindrical case having a refrigerant gas passage slidably housed in the case. By providing a check valve mechanism consisting of a spool and a coil spring that biases the spool in the direction of closing the refrigerant gas passage when the operation is stopped, it is possible to eliminate the need for long piping as in the past.
With a large space and no restrictions on installation direction, it is possible to prevent the high-temperature, high-pressure gas inside the sealed case from flowing back into the refrigeration system when the compressor is stopped, eliminating heat loss in the refrigeration system.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hermetic rotary compressor showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a refrigeration system using a conventional hermetic rotary compressor. cycle diagram,
FIG. 4 is a sectional view of a conventional check valve. DESCRIPTION OF SYMBOLS 10... Sealed case, 11... Compression element, 12... Electric element, 13... Suction tube, 14... Tube expansion part, 15...
...Case, 16, old...Spool, 17...
・Coil spring, 23... Refrigerant gas circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person5”
71 Ichiban Drunkenness 14- Buddhism and Old Japanese If--Case/6--Person Pool A-JJmIt Peeling OP

Claims (1)

[Claims] A cylindrical case forming part of a suction tube with a part expanded inside the sealed case containing a compression element and an electric element; a cylindrical spool having a refrigerant gas passage that opens at an end face of the spool and whose other end opens at a side face near the end face of the compression element; and a coil spring that biases the spool in a direction to close the refrigerant gas passage when the operation is stopped. A hermetic rotary compressor equipped with a check valve mechanism.