JPH04136470U - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] [Purpose] In a refrigeration cycle consisting of a capacity control compressor that bypasses a part of the refrigerant to the suction side of the compression chamber during compression and controls the opening and closing of the bypass valve according to the pressure of the refrigerant, To obtain a refrigeration system that is simplified and has high reliability accordingly. [Structure] In a refrigeration cycle composed of a compressor 1, a condenser 2, a throttle device 3, an evaporator 4, and a refrigerant pipe 8, the compressor outlet and a bypass valve 5 are connected via a high-pressure solenoid valve 6, and the compression The machine inlet and bypass valve 5 are connected via a thin tube 12.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is related to capacity control of refrigeration equipment, and aims to simplify parts of refrigeration equipment and improve reliability. This is related to improving reliability.

0002

[Conventional technology]

Figure 5 is a refrigerant circuit diagram of a conventional refrigeration system, and Figures 3 and 4 are, for example, Mitsubishi Electric Condenser "Sing Unit with Scroll Compressor Technical Manual" (January 1991) The bypass unloading method, which has been commonly used in the past, is shown in FIG. 2 is an internal structural diagram and a sectional view of a compressor having capacity control. In the figure, 1 is pressure Compressor, 2 is a condenser, 3 is a throttle device, 4 is an evaporator, 5 is an intermediate pressure gas cooling unit during compression. An intermediate pressure bypass valve that bypasses a part of the medium to the compression chamber inlet; High pressure solenoid valve that connects the intermediate pressure bypass valve, 7 is the compressor inlet and intermediate pressure bypass valve This is a low-pressure solenoid valve that connects 1 to 7 above with refrigerant piping 8, and It makes up the cycle.

0003 Next, the operation will be explained. In Fig. 5, under normal conditions, refrigerant is compressed by compressor 1. It becomes a high-temperature, high-pressure gas refrigerant and enters the condenser 2. The refrigerant imparts heat to the cooling fluid (e.g. outside air). It condenses and becomes a high-pressure liquid refrigerant, and is gradually reduced by the expansion device 3. After being compressed and turned into a low-temperature, low-pressure gas-liquid mixed refrigerant at the exit of the throttling device, it is sent to the evaporator 4. . Therefore, the refrigerant evaporates by absorbing heat from the heat source fluid (e.g. indoor air). , and returns to the compressor 1 as a low-temperature, low-pressure gas refrigerant. By repeating this process, heat can be transferred from the heat source fluid to the cooling fluid. Wear.

0004 Under normal conditions, by opening the high-pressure solenoid valve 6 and closing the low-pressure solenoid valve 7, intermediate pressure is bypassed. High-pressure gas refrigerant is transmitted to the outside of the pass valve 5, and the intermediate pressure bypass valve 5 is held down, reducing the pressure. Refrigerant in the process of being compressed is not bypassed.

[0005] Next, the time of capacity control will be explained. By closing the high pressure solenoid valve 6 and opening the low pressure solenoid valve 7, the intermediate pressure bypass valve 5 is removed. The low-pressure gas refrigerant is transmitted to the side, which is formed between the fixed scroll 9 and the oscillating scroll 10. The refrigerant in the compression chamber 11 is compressed by the intermediate pressure bypass valve 5 while being compressed by the compressor 1. By being pushed open by the intermediate pressure gas refrigerant, it is returned to the low pressure side and from the evaporator 4. It joins with the returning low-temperature, low-pressure gas refrigerant and is sucked into the compressor 1 again.

[0006] As a result, only the remaining intermediate pressure gas refrigerant that has not been bypassed is pressurized by compressor 1. Because the compressed refrigerant is compressed, the heat capacity that transfers heat from the heat source fluid to the cooling fluid decreases. The amount can be reduced.

[0007]

[Problem that the idea aims to solve]

Conventional refrigeration equipment is configured as described above, so two solenoid valves are used to control capacity. This is always necessary, and there is a problem in that the device becomes complicated.

[0008] This idea was made to solve the problems mentioned above, and was designed to solve the problems mentioned above. The purpose is to simplify the product and improve reliability accordingly.

[0009]

[Means to solve the problem]

The refrigeration system according to this invention bypasses a part of the refrigerant during compression to the suction side of the compression chamber. , capacity control compressor, condenser, and throttle that control the opening and closing of the bypass valve using refrigerant pressure. In a refrigeration cycle consisting of a device, evaporator, and refrigerant piping, the compressor output Connect the compressor inlet and the intermediate pressure bypass valve via a solenoid valve, and connect the compressor inlet and the bypass valve to the It is connected via a pipe.

0010

[Effect]

Normally, the refrigeration system in this invention has a connection between the compressor outlet and the intermediate pressure bypass valve. By opening the solenoid valve installed in between, high pressure is applied to the outside of the intermediate pressure bypass valve. and close the bypass valve, and when controlling the capacity, connect the valve between the compressor outlet and the intermediate pressure bypass valve. Low pressure pressure is transmitted from the compressor inlet through the capillary by closing the provided solenoid valve. The power is applied to the intermediate pressure bypass valve, but the bypass valve is applied to the intermediate pressure gas refrigerant during compression. By pushing open the refrigerant, the refrigerant is bypassed to the low pressure side.

[0011]

【Example】

Example 1. An embodiment of this invention will be described below. Figure 1 shows one implementation of this idea. It is a refrigerant circuit of a refrigeration system by example. In Figure 1, 1 to 9 are exactly the same as the conventional device. belongs to. 12 is a thin tube connecting the compressor inlet and the intermediate pressure bypass valve; The refrigerant flow resistance value is the outside pressure of the intermediate pressure bypass valve 5 when the high pressure solenoid valve 6 is opened. is set sufficiently large so that the pressure is higher than the compressor intermediate compression chamber pressure.

0012 Next, the operation will be explained. Normally, the refrigerant is compressed by compressor 1 and becomes a high-temperature, high-pressure gas. It becomes a refrigerant and enters the condenser 2. The refrigerant releases heat to the cooling fluid (e.g. outside air). It condenses into a high-pressure liquid refrigerant, which is then gradually reduced in pressure by the throttling device 3. After becoming a low-temperature, low-pressure gas-liquid mixed refrigerant at the outlet, it is sent to the evaporator 4. So the refrigerant It evaporates by absorbing heat from the heat source fluid (e.g. indoor air) and becomes a low-temperature, low-pressure gas. It becomes a refrigerant and returns to the compressor 1.

[0013] At this time, by opening the high pressure solenoid valve 6, the pressure outside the intermediate pressure bypass valve 5 is reduced. Because the resistance of pipe 12 is large, the pressure is almost the same as that of the high-temperature, high-pressure gas refrigerant compressed by compressor 1. is transmitted, and this pressure presses down the intermediate pressure bypass valve 5, preventing cooling during compression. The medium is not bypassed and is compressed. Also, a part of the high-temperature, high-pressure gas refrigerant passes through the capillary tube 12 and enters the compressor inlet, but due to the resistance of the capillary tube 12, Because it is large, there is almost no flow.

[0014] Next, the time of capacity control will be explained. When the high-pressure solenoid valve 6 is closed, the low-pressure gas refrigerant is distributed to the outside of the intermediate pressure bypass valve 5 in a pressure-equalizing pipe. 12, but the compression formed between the fixed scroll 9 and the oscillating scroll 10 The refrigerant in the chamber 11 is at an intermediate pressure when the intermediate pressure bypass valve 5 is in the middle of being compressed by the compressor 1. By being pushed open by the gas refrigerant, it is returned to the low pressure side and returned from the evaporator 4. It joins with the low-temperature, low-pressure gas refrigerant and is sucked into the compressor 1 again.

[0015] As a result, only the remaining intermediate pressure gas refrigerant that has not been bypassed is pressurized by compressor 1. Because the compressed refrigerant is compressed, the heat capacity that transfers heat from the heat source fluid to the cooling fluid decreases. The amount can be reduced.

[0016] Example 2. As shown in Fig. 2, a low pressure solenoid valve 7 is used instead of the high pressure solenoid valve 6 to connect the thin tube 12 Even if the connecting positions are reversed to the high pressure side and low pressure side, the same effect and operation can be obtained.

[0017]

[Effect of the idea]

Since this device is configured as explained above, intermediate pressure is controlled during capacity control. Only one solenoid valve is required to open and close the bypass valve, which simplifies the equipment and reduces costs. A highly reliable refrigeration system can be obtained.

[Brief explanation of drawings]

FIG. 1 shows a refrigerant circuit diagram of a refrigeration system according to an embodiment of this invention.

FIG. 2 shows a refrigerant circuit diagram of a refrigeration system according to another embodiment of the invention.

FIG. 3 shows a diagram of the internal structure of the capacity control compressor.

FIG. 4 shows a sectional view of a capacity control compressor.

FIG. 5 shows a refrigerant circuit of a conventional refrigeration system.

[Explanation of symbols]

1 Compressor 2 Condenser 3 Squeezing device 4 Evaporator 5 Intermediate pressure bypass valve 6 High pressure solenoid valve 7 Low pressure solenoid valve 8 Refrigerant piping 12 tubules

Claims (1)

[Scope of utility model registration request] Claim 1: A capacity control compressor, a condenser, a throttle device, an evaporator, and a refrigerant pipe, which bypass a part of the refrigerant during compression to the suction side of the compression chamber and control the opening and closing of the bypass valve based on the pressure of the refrigerant. 1. A refrigeration system comprising a refrigeration cycle in which a compressor outlet and a bypass valve are connected via a solenoid valve, and a compressor inlet and a bypass valve are connected via a thin tube.