JPH0414267B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a refrigeration cycle equipped with a check valve or an on-off valve, which is improved so that fluid can flow in either direction through its pipes. The present invention relates to a fluid communication method.

[Technical background of the invention]

Figure 6 shows an example of a conventional refrigerator.
is a fan device, 2 is a cooling cooler for cooling the air in the freezer compartment 3 and the refrigerator compartment 4 that is forcibly circulated by the fan device 1, and 5 is a direct cooling cooler that directly cools the inside of the freezer compartment 3. be. As shown in FIG. 7, these coolers 2 and 5 for intercooling and direct cooling have a primary capillary tube 6, a secondary capillary tube 7,
It is connected in series with the check valve 8 and the suction pipe 9 to form a unit, and after being assembled into the main body box 10 of the refrigerator, it is connected to a condenser, a compressor (not shown), etc. By the way, the check valve 8 is intended to prevent the gas refrigerant heated during defrosting by the heater of the intercooling cooler 2 from flowing back into the direct cooling cooler 5 and heating the freezer compartment 3. be.

[Problems with background technology]

By the way, before the coolers 2 and 5 unitized as described above are assembled into the main body box 10, a test is performed to see if gas leaks from each connection portion by brazing. This leak test is performed by first evacuating the air in the pipe and then filling it with helium gas, but in this case, since there is a check valve 8 in the pipe, At times, the air in the pipeline is sucked through the suction pipe 9, and when helium gas is filled, the air is sucked through the primary capillary tube 6.
Therefore, it was not possible to vacuum or supply helium gas from either one side of the primary capillary tube 6 or the suction pipe 9, which caused the problem that the work took time. .

[Purpose of the invention]

The present invention was made in view of the above circumstances, and
The purpose of this is to allow fluid to flow in either direction in a refrigeration cycle equipped with valves such as check valves in pipes or normally closed on-off valves that open and close when the compressor starts or stops. An object of the present invention is to provide a method for fluid communication in a refrigeration cycle, which allows both fluid flow and fluid supply to be performed at one location.

[Summary of the invention]

The present invention provides a refrigeration cycle in which a valve such as a check valve or a normally closed on-off valve that opens and closes when a compressor is operated or stopped is provided in a pipe, and a bypass pipe with low flow resistance is installed in parallel with the valve. Connect the valve so that air bypasses the valve and flows through the bypass pipe when evacuation is performed during a leak test or refrigerant filling process, and when the test gas or refrigerant is supplied after evacuation, the test gas or refrigerant passes through the valve. This is characterized in that the flow is made to flow through the bypass pipe while bypassing the air, and the bypass pipe is shut off after the leak test process or the refrigerant sealing process is completed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. However, the same parts as in FIG. 7 are given the same reference numerals and detailed explanations are omitted.

In FIGS. 1 and 2, 11 indicates a primary capillary tube 6, a direct cooling cooler 5, a secondary capillary tube 7, a check valve 8, an intercooling cooler 2, and a suction pipe 9 connected in series. The cooler unit 11 is connected to the check valve 8, and a bypass pipe 12 is connected to the connecting portion of the cooler unit 11 in parallel with the check valve 8.

To perform a leak test on the cooler unit 11, first, one of the primary capillary tube 6 and the suction pipe 9, for example, with one of the primary capillary tubes 6 sealed, a vacuum is applied from the other side, that is, the suction pipe 9 side. Make a pull. At this time, the air in the pipe flows in the direction of arrow A in FIGS. 1 and 3, but since this direction is the opening direction for the check valve 8, both the check valve 8 and the bypass pipe 12 is passed through it and evacuated. After this evacuation, the cooler unit 1 is also connected from the suction pipe 9 side.
A test gas, such as helium gas, is supplied into the first pipe. At this time, helium gas flows in the direction of arrow B in FIGS. 1 and 3. Since this direction is the closing direction for the check valve 8, the check valve 8
is closed, but a bypass pipe 1 is connected in parallel with the check valve 8.
2, helium gas flows through the bypass pipe 12 and fills the pipe line. After filling the pipe with helium gas in this way, an actual leak test is performed.

Now, after performing the leak test as described above, the cooler unit 11 is assembled into the main body box and connected to the condenser, compressor, etc. Fourth
The figure shows the overall configuration of the refrigerant cycle after this connection. is connected to the intake port 15b of the rotary compressor 15 via the check valve 16.
Bypass pipes 17 and 18 are connected to the connecting portion of the differential pressure valve 13 and the connecting portion of the check valve 16 in parallel with the differential pressure valve 13 and the check valve 16, respectively. Incidentally, 19 is a communication pipe that communicates the differential pressure valve 13 and the suction port 15b side of the rotary compressor 15. The differential pressure valve 16 is normally closed, and the pressure between the suction side and the discharge side that occurs when the rotary compressor 15 is operated is controlled. Due to the difference, the capacitor 14 and the primary capillary tube 6 are opened to communicate with each other. The differential pressure valve 13 and the check valve 16 function to prevent the high temperature refrigerant in the condenser 14 from flowing into the coolers 2 and 5 when the rotary compressor 15 is stopped.

After connecting the cooler unit 11 to the condenser 14 and rotary compressor 15 as described above, in order to seal in the refrigerant, first evacuate the air in the pipe line from the injection pipe 20 connected near the rotary compressor 15. After that, refrigerant is similarly supplied into the pipe line from the injection pipe 20. . During evacuation, the air in the pipeline flows through the bypass pipe 17 in the direction of arrow C even when the differential pressure valve 13 is closed, and also flows through both the check valve 16 and the bypass pipe 18. Flows in the direction of arrow D. Furthermore, during refrigerant supply, the refrigerant flows in the direction of arrow E through the bypass pipe 17 even when the differential pressure valve 13 is closed, and through the bypass pipe 18 even when the check valve 16 is closed. It flows in the direction of arrow F.

After filling the refrigerant, in order to block each bypass pipe 12, 17, and 18, as shown in FIG. The parts are also crimped and sealed. Incidentally, the bypass pipe 12 of the check valve 8 may be shut off after the leak test process is completed.

In the above embodiment, a differential pressure valve is used as the on-off valve, but it may also be a solenoid valve.

〔Effect of the invention〕

As is clear from the above description, when filling a leak test gas or refrigerant after evacuation, even if the on-off valve is closed, or the flow direction of the fluid (air) due to evacuation and leakage Even if the flow directions of the test gas or refrigerant are opposite to each other and the check valve is closed for one of the flows, the fluid will bypass the on-off valve or check valve and flow into the bypass pipe. Flow through the air allows both evacuation and leak test gas or refrigerant supply to be performed in one place, making it possible to perform the work simply and in a short time. Moreover, since the bypass pipe is formed of a pipe with low flow resistance, the bypass pipe does not obstruct the flow of fluid, and the time required for evacuation and supply of test gas or refrigerant can be shortened. The working time can be shortened. Furthermore, since the bypass pipe is shut off after a leak test or after refrigerant is filled, the valve will effectively perform its original function when the refrigeration cycle is operated, and no functional problems will occur in the refrigeration cycle. do not have.

[Brief explanation of drawings]

Figures 1 to 5 show one embodiment of the present invention. Figure 1 is a circuit diagram of a cooler unit, Figure 2 is a perspective view of the cooler unit, and Figure 3 is an enlarged view of the main parts. A perspective view, FIG. 4 is a circuit configuration diagram of the entire refrigeration cycle, FIG. 5 is a diagram equivalent to FIG. 3 after refrigerant is sealed, and FIGS. 6 and 7 are cross-sectional views of the refrigerator, respectively, to explain the conventional example. 1 and a diagram corresponding to FIG. 1. In the figure, 2 is an intercooling cooler, 5 is a direct cooling cooler,
8 is a check valve, 12 is a bypass pipe, 13 is a differential pressure valve (on-off valve), and 17 and 18 are bypass pipes.

Claims (1)

[Claims] 1. In a refrigeration cycle in which a valve such as a check valve or a normally closed on-off valve that opens and closes when the compressor starts and stops is installed in the pipe, a bypass pipe with low flow resistance is connected in parallel with the valve. When vacuuming in the leak test process or refrigerant filling process, air bypasses the valve and flows through the bypass pipe, and when the test gas or refrigerant is supplied after evacuation, the test gas or refrigerant passes through the valve. 1. A method of fluid communication in a refrigeration cycle, characterized in that the fluid flows through a bypass pipe in a detour, and the bypass pipe is shut off after a leak test step or a refrigerant sealing step is completed.