JPH027345Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an expansion valve equipped with a defrost pipe joint in a refrigerator having a hot gas defrost cycle.

[Prior Art] Conventionally, in general, a refrigerator having a hot gas defrost cycle has a refrigeration cycle in which the discharge side of a compressor 1 has a condenser 2, a liquid receiver 3,
The hot gas defrost cycle is connected to the suction side of the compressor 1 by a line 7 via an expansion valve 4, an evaporator 5, and an accumulator 6. Bypassing the container 2, receiver 3, and expansion valve 4, the evaporator 5
It is connected to the. In normal refrigeration operation, the high-temperature, high-pressure refrigerant gas discharged from the compressor 1 is cooled and liquefied in the condenser 2, stored in the liquid receiver 3, and then expanded in the expansion valve 4, resulting in low temperature and low pressure. The refrigerant liquid is put into the evaporator 5 and evaporated, and the latent heat of evaporation at this time performs a freezing action. Next, if frost forms on the evaporator 5 during such refrigeration operation, the hot gas from the compressor 1 is directly introduced into the evaporator 5 via the line 8 using the switching valve 9, and the heat quantity of the gas removes the frost on the evaporator 5. It is designed to dissolve and remove.

Therefore, in reality, the line 8 to the evaporator 5 side
Conventionally, as shown in FIG. 2, a defrost pipe 12 is connected to a pipe 10 between an expansion valve 4 and an evaporator 5 via a joint 11.

As prior art, Utility Model Application Publication No. 55-34041,
There is Utility Model Application No. 55-169983.

[Problems to be solved by the invention] In the conventional example described above, it is desirable for performance to make the piping 10 between the expansion valve 4 and the evaporator 5 as short as possible; It has to be long. In addition, there are few small expansion valves that have a fixed structure, and most of them are supported by piping, so with piping as shown in Figure 2, cracks may occur at the connections due to vibration. be. Further, when the refrigerator is used at a low internal temperature, a small amount of moisture in the refrigerant may freeze the nozzle portion of the expansion valve, which may block the expansion valve's normal operation.

In view of these circumstances, the present invention integrates a defrost pipe fitting near the nozzle outlet side of the expansion valve body, shortens the piping between the expansion valve and the evaporator, and supports the expansion valve itself with the piping. It is an object of the present invention to provide an expansion valve which is made strong and allows the nozzle part to defrost.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a configuration in which a defrost pipe joint is provided near the nozzle outlet side of the expansion valve body.

[Function] Based on the above configuration, the present invention provides a joint for the defrost pipe near the nozzle outlet side of the expansion valve body, so that hot gas from the defrost pipe reaches the evaporator side while touching the nozzle part during defrosting operation. This will thaw the frozen water in the nozzle and allow the expansion valve to operate normally.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In FIG. There is a nozzle part 14 for thinning the refrigerant up to the nozzle part 14, and an inlet joint 15 is provided.
An outlet joint 16 is provided on the opposite side of the inlet joint 15, and a defrost pipe joint 17 is further provided near the outlet side of the nozzle portion 14. The inlet joint 15 is connected to the liquid receiver via piping, the outlet joint 16 is directly connected to the evaporator, and the defrost pipe is connected to the joint 17. Incidentally, reference numeral 18 denotes a temperature-sensitive tube attached to the evaporator outlet to automatically adjust the valve opening depending on the degree of superheating of the steam.

As described above, the present invention has a structure in which the defrost pipe joint 17 is directly attached to the expansion valve body 13 and the defrost pipe is connected thereto, so there is no need to provide a conventional defrost pipe joint in the middle of the piping. As a result, the piping between the expansion valve and the evaporator is shortened, improving performance. Since the expansion valve main body 13 has three joints 15 to 17 and is supported by three pipes, vibration is reduced compared to the conventional case of two pipes, and cracks in the pipes can be prevented. can. Since the defrost pipe joint 17 is provided near the outlet side of the nozzle part 14, hot gas from the defrost pipe comes into contact with the nozzle part 14 during defrosting operation and is forced into the evaporator side. 14 is frozen, it can be instantly thawed and the expansion valve can be returned to normal operation.

[Effects of the invention] As described above, according to the invention, since the defrost pipe joint is provided near the nozzle outlet side of the expansion valve body, the piping between the expansion valve and the evaporator can be shortened. The performance of the refrigerator is improved.

Furthermore, since the expansion valve main body has three joints, the expansion valve main body is supported by three pipes, and problems with the pipes due to vibration are eliminated.

Furthermore, if the nozzle part freezes, the nozzle part is instantly thawed by the hot gas during the defrosting operation.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a cycle of a refrigerator to which the present invention is applied, Fig. 2 is a side view showing the connection state of a conventional defrost pipe joint, and Fig. 3 is an illustration of an embodiment of an expansion valve according to the present invention. FIG. 3 is a side view partially cut away. 4... Expansion valve, 13... Expansion valve body, 14...
Nozzle part, 17... joint for defrost pipe.

Claims (1)

[Scope of utility model registration request] An expansion valve characterized in that a defrost pipe joint is provided near the nozzle outlet side of the expansion valve body.