JPH02264177A - Scroll compressor suction check valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the mounting location, valve structure, and valve material of an internal check valve in a multi-scroll compressor.

[Conventional technology]

In the conventional device, as described in JP-A-59-141782, the tip of the suction pipe formed a seat surface with the piston, so the suction pipe was welded to the lid chamber.
At the time, thermal deformation during bath welding caused a tilt, and this tilt caused poor adhesion with the piston and caused leakage.

[Problem to be solved by the invention]

The check valve of the above-mentioned conventional technology is a check valve for preventing sudden pressure fluctuations in the pressure 4-6 when the compressor is stopped, and consideration has been given to leakage from the check valve. In the case of a multi-scroll compressor, if refrigerant gas leaks from a stopped compressor, it will reduce the refrigerating capacity of the operating compressor, and the leaked refrigerant gas will heat the suction gas of the operating compressor. There were problems such as increasing the temperature of the discharged gas.

The purpose of the present invention is to eliminate leakage from the check valve of the compressor when it is stopped, and to prevent a decrease in the refrigerating capacity of the compressor during operation, in order to satisfy the function of the check valve of the multi-scroll compressor. There is a particular thing.

Another object of the present invention is to eliminate leakage from the check valve of the compressor when it is stopped, and to satisfy the function of a heel multi-scroll compressor by eliminating the thermal influence of the compressor during operation.

[Means to solve the problem]

In order to achieve the above objective, each compressor is provided with a check valve, and in order to eliminate the suction arrangement which roughly describes the structure of the check valve in the prior art, the suction piping and the valve are installed. A separate member is provided in between. This separate member is press-fitted into the fixed scroll so as to be perpendicular to the valve hole, thereby preventing the seat surface from tilting.

Furthermore, as a means for eliminating leakage, a buffer plate is interposed between the separate member provided above and the valve, and the buffer plate is made of a soft material to improve its adhesion to the valve.

Furthermore, as a means to eliminate leakage, the seat surface of the valve or the entire valve is made of fluororesin to improve adhesion even when the roughness of the mating notebook surface of the valve is poor.

[Effect]

A separate member is press-fitted into the suction port of the fixed scroll, so that the top surface of the separate member is formed perpendicular to the valve hole. Even if the suction pipe is tilted when welding it to the lid cap, if the separate member and suction pipe are inserted through the QIJ ring, the seat surface with the valve will not be affected. Therefore, the parallelism between the seat surface of the valve and the seat surface of the separate member is determined by the separate member insertion hole machined in the fixed scroll, the outside diameter of the separate member, and the perpendicularity of the seat surface. There is no outward appearance. Furthermore, if the roughness of each seat surface is poor, leakage will occur if the auxiliary joint is used, but this problem can also be solved by sandwiching a soft buffer plate with good adhesion to the seat surface or by making the valve material from fluororesin. Even if the surface roughness of the valve is poor, it is possible for the valve to fit tightly and prevent leakage.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. low temperature·
From the evaporator 1, the low-pressure refrigerant gas passes through the pipe 2 and is then split into the distribution u8.4. (In the following explanation, the left side will be explained because the left and right sides are similar.) The pipe 8 is connected to the suction pipe 5. The suction pipe 5 is fixed to the lid cap 6 by welding, and is engaged with a stopper 8 press-fitted into the fixed scroll via an O-ring 9. (An enlarged view of this part is shown in Figure 3.) As shown in Figure 3, the refrigerant gas flowing in from the suction pipe 5 pushes away the spring 11 that presses the valve 10 in the closing direction, and enters the suction chamber 12. enter. The compression chamber is formed by a fixed scroll and an orbiting scroll 13. Due to the orbiting motion of the orbiting scroll, the refrigerant gas becomes high temperature and under pressure and is discharged into the casing 15 from the discharge port 14+. The orbiting motion of the orbiting scroll is performed by a frame 16, a drive shaft 17, and an Oldham ring 18. The refrigerant gas discharged from the discharge port 14 flows through the casing and is discharged from the discharge port 19 to the outside of the casing. This discharged gas is led to a condenser 21 through a pipe 20 and becomes a medium-temperature, high-pressure liquid refrigerant in a circulating section, and is connected to an expansion valve 28 through a pipe 22. The liquid refrigerant is gasified by the expansion valve and turned into a low-temperature, low-pressure refrigerant gas in the evaporator 1 for heat exchange. After heat exchange, the refrigerant gas is transferred to pipe 2.
It splits into pipes 8.4 along the way, forming a series of refrigeration cycles that reach each compression mechanism. If one compression mechanism section is stopped here, the valve 10 on the stop side is operated by the spring 11.
The return fL is brought into close contact with the seat surface of the stopper 8, separating high pressure and low pressure, and creating a pressure difference at all times. This stopper is press-fitted into the fixed scroll 7.

Since the perpendicularity of the stopper's outer diameter and seat surface to the stopper insertion hole and valve hole of the fixed scroll can be controlled by machining, the perpendicularity of the stopper's seat surface can be almost eliminated. Therefore, the seat surface of the stopper and the seat surface of the valve can be closely layered to prevent leakage. Furthermore, leakage may be caused by the surface roughness of the sheet surface, but if the surface roughness of the sheet surface is machined (128), a large amount of leakage will not occur.
It is shown in Figure 4. In this embodiment, a soft buffer plate 24 is sandwiched between the stopper 8 and the valve 100. The sheet surface was formed between the buffer plate and the machined surface of the 7-mm buffer plate was able to absorb and stop leakage. In yet another embodiment, the seat surface or the entire valve of the valve 10 shown in FIG. 3 may be made of fluororesin, and the same leak-preventing effect as described above can be obtained.

FIG. 2 shows an embodiment of a multi-type compressor in which the four structures of the compressor are different from the above-mentioned embodiments. In this figure, pipe 2 from evaporator 1 is connected to pipe 8. It is connected to the suction pipes 5, 5' of the two If shrinking bales 25, 26 divided into cows, and the discharge port 19. l! From J', the dyes are mixed into one in the discharge pipe 20 and reach the condenser 21. From this point on, the same refrigeration cycle as the embodiment shown in FIG. 1 is formed. All 27 gs are installed to even out the oil. Even in this embodiment, when one compressor is stopped, the check valve on the stop side can eliminate the inclination of the seat surface as explained in FIG. 1, and can stop leakage.

〔Effect of the invention〕

According to the present invention, when a plurality of compressors are configured in one refrigeration cycle, by providing an internal check valve on the suction side or discharge side of each compressor, the compressor can be stopped or stopped at will.
Can be started.

In order to stop leakage R'L of refrigerant gas from the check valve on the stop side, it was press-fitted into the fixed scroll. By configuring the mating seat surface of the valve seat surface with a separate member, the inclination of the 7-to-to surface was eliminated, and leakage could be prevented by improving adhesion. In addition, when leakage occurs due to the surface roughness of the seat surface, it is possible to stop the leakage by inserting a soft buffer plate between the seat surfaces. By doing so, the effect of preventing leakage due to the surface roughness of the sheet surface is diminished.

[Brief explanation of drawings]

Figure i1 is a longitudinal cross-sectional view of a scroll compressor having two compression mechanisms in the same casing according to an embodiment of the present invention,
The figures show other embodiments, including a vertical cross-sectional view of a scroll compressor in which two compressors are connected by piping, Fig. 8 is an enlarged view of section A in Fig. 1, and Fig. 4 shows the stopper and the stopper in Fig. 3. It is a sectional view showing a buffer plate inserted between the valves. 5...Suction piping 7...Fixed scroll 8.
...Stopper 9...0 ring 10...Valve 1
1...Spring 24...Buffer plate. 20th inhalation melting is t 017a 2ri 20 ruby, koriokari/゛1 judgment (2)

Claims (7)

[Claims] 1. Compression is made up of a fixed scroll, an orbiting scroll, a frame, a drive shaft, etc., which create high pressure inside the casing and rotate relative to each other.A suction hole and check valve are provided at the end of the fixed scroll in the direction of the drive shaft. A suction check valve for a tandem scroll compressor, characterized by having two sets of mechanism parts in the same casing and having a common high pressure side. 2. The inside of the casing is kept at low pressure and relative rotational motion is performed. It consists of a fixed scroll, an orbiting scroll, a frame, a drive shaft, etc., and has two sets of compression mechanisms in the same casing with a discharge hole and a check valve at the beginning of winding of the fixed scroll, and the low pressure side is common. A suction check valve for a tandem scroll compressor, characterized by: 3. In a scroll compressor in which the pressure inside the casing is high, two or more compressors are arranged in parallel, and the suction pipes and discharge pipes of each compressor are connected, each compressor has a relatively rotating motion. It consists of a fixed scroll, an orbiting scroll, a frame, a drive shaft, etc.
A suction check valve for a scroll compressor, characterized in that a suction hole and a check valve are provided at the winding end of a fixed scroll in the direction of a drive shaft. 4. In a scroll compressor in which the pressure inside the casing is low, two or more compressors are arranged in parallel, and the suction pipes and discharge pipes of each compressor are connected, each compressor has a relatively rotating motion. conduct. Consists of a fixed scroll, an orbiting scroll, a frame, a drive shaft, etc.
A suction check valve for a scroll compressor, characterized in that a suction hole and a check valve are provided at the winding start portion of a fixed scroll. 5. 4. The scroll compressor according to claim 1, wherein the check valve has a check valve and a cylindrical separate member, and the separate member is press-fitted into the fixed scroll. 6. 6. The scroll compressor according to claim 5, further comprising a check valve in which a buffer plate is provided between the valve of the check valve and the cylindrical separating member. 7. 7. The scroll compressor according to claim 1, further comprising a check valve whose valve seat surface or the entire valve is made of a fluororesin.