JPH0336855Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a refrigeration cycle in which a check valve is provided between two coolers.

[Technical background of the invention]

Figure 3 shows an example of a conventional refrigerator.
2 is a fan device, 2 is a first cooler that cools 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 second cooler that directly cools the inside of the freezer compartment 3. be. These first and second coolers 2 and 5 are connected in series together with a main capillary tube 6 and a sub-capillary tube 7, which are expansion devices, a check valve 8, and a suction pipe 9, as shown in FIG. After being assembled into a unit and assembled into the main body box 10 of the refrigerator, it is connected to a capacitor, a compressor (not shown), and the like. By the way, check valve 8
This is 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.

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. In this case, since there is a check valve 8 in the pipe, the helium gas cannot be sealed from the suction pipe 9 side. Therefore, conventionally, helium gas was filled from the main capillary tube 6 side.

[Problems with background technology]

However, in the conventional refrigeration cycle, helium gas can only be sealed from the main capillary tube 6 side as described above, so that the sealed helium gas flows through both capillary tubes 6 and 7 and the check valve 8, which have large flow path resistance. Since the gas flows in series, it takes a long time to completely fill the gas, resulting in extremely poor workability.

[Purpose of invention]

An object of the present invention is to provide a refrigeration cycle that can fill gas in a short time.

[Summary of the idea]

By providing a gas-filled pipe between the throttle device and the check valve, the present invention makes it possible to distribute the gas between the throttle device and the check valve without having to flow the gas in series through the throttle device and the check valve, which have large flow path resistance. It is characterized by the fact that it is made as follows.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. However, the same parts as in FIG. 4 are given the same reference numerals and detailed explanations are omitted.

In FIGS. 1 and 2, 11 indicates a main capillary tube 6 corresponding to a throttle device, a first cooler 5, an auxiliary capillary tube 7, a check valve 8, a second cooler 2, and a suction pipe. This is a cooler unit composed of 9 connected in series. Reference numeral 12 denotes a gas-filled tube, which is provided between the main capillary tube 6 and the check valve 8, for example, at a connecting portion of the first cooler 5 with the sub-capillary tube 7. The cooler unit 11 has an end on the main capillary tube 6 side connected to the discharge side of the compressor 14 via the condenser 13, and an end on the suction pipe 9 side connected to the suction side of the compressor 14. make up the refrigeration cycle. Incidentally, when the cooler unit 11 is incorporated into the main body box 10 of the refrigerator to constitute a refrigeration cycle, refrigerant gas is sealed in the pipe line and the gas-filled pipe 12 is kept in a sealed state.

To perform a leak test on the cooler unit 11, first, a vacuum is drawn from the suction pipe 9 side with the main capillary tube 6 and gas-filled tube 12 sealed. At this time, the air in the pipe flows in the direction of arrow A in FIG. 2, but since this direction is the opening direction for the check valve 8, it flows through the check valve 8 and is evacuated. After this evacuation, the end on the suction pipe 9 side is sealed and helium gas is supplied from the gas-filled tube 12 into the conduit of the cooler unit 11. Then, the helium gas flows from the gas-filled tube 12 in the directions indicated by arrows A and B in FIG. 2, respectively. Since the helium gas flowing in the direction of arrow A is the opening direction for the check valve 8, the auxiliary capillary tube 7, the check valve 8, and the first
It passes through the cooler 2 and suction pipe 9 in order and is sealed inside these. At the same time, the helium gas flowing in the direction of arrow B sequentially passes through the second cooler 5 and the main capillary tube 6 and is sealed therein. After helium gas is sealed in the pipe in this manner, a helium gas leak test is performed to check for gas leakage from the connection portion of the cooler unit 11.

As described above, according to this embodiment, the helium gas sealed from the gas filling tube 12 is distributed in different directions and divided into the main capillary tube 6 side and the sub-capillary tube 7 and check valve 8 side. Compared to the conventional method, in which helium gas had to be filled by flowing these gases in series, the time required for filling can be significantly shortened, and the workability of gas leak inspection can be improved. Also,
Even when the refrigeration cycle is configured and refrigerant gas is sealed inside the refrigeration cycle after such a gas leak test, the refrigerant gas can be quickly filled into the refrigeration cycle from the gas filling tube 12.

[Effect of idea]

As described above, the present invention is capable of distributing and sealing gas to both sides from the gas filling pipe provided between the throttle device and the check valve, so it is possible to separate the gas from the gas filling pipe installed between the throttle device and the check valve. This has the excellent effect of significantly shortening the time required to fill in gas compared to the conventional method in which gas was filled in through stop valves in series.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
Figure 1 is a circuit diagram of the entire refrigeration cycle, Figure 2 is a circuit diagram of the cooler unit, Figures 3 and 4 are
The figures are a partial sectional view of a refrigerator and a view corresponding to FIG. 2, respectively, for explaining a conventional example. In the drawing, 2 is a first cooler, 5 is a second cooler, 6 is a main capillary tube (throttle device), and 8
1 is a check valve, and 12 is a gas-filled pipe.

Claims (1)

[Scope of utility model registration request] A throttle device, a first cooler, a check valve, and a second cooler are connected in sequence, characterized in that a gas-filled pipe is provided between the throttle device and the check valve. Refrigeration cycle.