JPH01314855A - Refrigerator - Google Patents

Abstract

PURPOSE:To reduce refrigerant sound without increasing the resistance of discharging gas not more than required by providing a heat exchanger at the refrigerant input side of an auxiliary pressure reducing unit provided with a bypass passage for introducing part of high pressure refrigerant from a high pressure side to a low pressure side. CONSTITUTION:A bypass passage 9 for introducing part of high pressure refrigerant is connected between the discharge tube 2 and the suction tube 7 of a refrigerant compressor 1, and a motor-driven expansion valve to become an auxiliary pressure reducing unit 10 and a heat exchanger 12 with a heat sink fin 11 at the refrigerant input side of the unit 10 are disposed in the passage 9. For example, when a room is not so necessary to be cooled, if the rotating speed of a fan is extremely reduced, the blowing air amount to a condenser 3 is unavoidably reduced, its temperature becomes high, and the refrigerant pressure increases. However, since the exchanger 12 and the unit 10 are disposed in the passage 9, the valve of the unit 10 is opened, and the rise of the high pressure of a refrigerant circuit is suppressed by the short-circuit of part of the refrigerant to an air/liquid separator 8 through the exchanger 12 and the unit 10 to be partly heat dissipated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a refrigeration system having a refrigeration cycle.

<Prior art> This type of refrigeration equipment conventionally used has a pressure Mi
If the high-pressure discharged gas from the 11 is directly bypassed to the low-pressure side through the auxiliary pressure reducer, the flow rate will be high and extremely high-pitched refrigerant noise will be generated. Therefore, in order to slow down this flow rate, a bypass short circuit is used as a pressure reducer using a capillary tube and a solenoid valve (for example, see Japanese Utility Model Publication No. 47-40823).

<Problems to be Solved by the Invention> However, in such a short-circuit method, resistance increases and a defect occurs in that the required flow rate of discharged gas does not flow.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention aims to provide a refrigeration system that reduces refrigerant noise without unnecessarily increasing the resistance of discharged gas.

Means for Solving the Problems> The present invention connects a compressor, a condenser, a pressure reducer, and an evaporator in a ring to form a refrigerant circuit, and supplies high-pressure refrigerant from the high-pressure side to the low-pressure side of the refrigerant circuit. In a refrigeration system in which an auxiliary pressure reducer is provided in a bypass path that guides a portion of the high-pressure refrigerant, the bypass path is provided with a heat exchanger that cools a portion of the high-pressure refrigerant on the refrigerant inflow side of the auxiliary pressure reducer.

The heat exchanger is a heat exchanger with heat radiation fins.

Further, the heat exchangers are a heat exchanger placed on the refrigerant inflow side of the auxiliary pressure reducer and an auxiliary heat exchanger placed on the refrigerant outflow side.

Alternatively, the heat exchanger may be arranged in a gas-liquid separator interposed in the suction pipe returning to the compressor.

Alternatively, the heat exchanger may be a double-tube heat exchanger that includes a heat exchanger and an auxiliary heat exchanger.

Further, the double-pipe heat exchanger may be a double-pipe heat exchanger in which an auxiliary pressure reducer is connected between the heat exchanger and the auxiliary heat exchanger, and heat radiation fins are provided on the outer periphery.

Due to the above structure, a part of the gas discharged from the compressor is cooled by the heat exchanger in the bypass path and guided to the auxiliary pressure reducer (electric expansion valve). The refrigerant circuit returns from the gas-liquid separator to the compressor together with the suction gas that has passed through the gas-liquid separator and evaporator, so the discharge gas is cooled and the density of the refrigerant increases, and when flowing at the same weight flow rate, it passes through the pressure reducer. The flow rate decreases. Therefore, refrigerant noise is greatly reduced.

<Example> The present invention will be described below based on the drawings of the example.

Fig. 1 shows an embodiment in which a heat exchanger is placed in front of an auxiliary pressure reducer in a bypass path, 1 is a refrigerant compressor 8, a condenser 3 is connected to the tip of this discharge pipe 2, The compressor 81 is connected to the condenser 3 through a capillary tube that connects a pipe 4 to a pressure reducer 5, passes through an evaporator 6, and then from a suction pipe 7 to a gas-liquid separator 8.
It constitutes a refrigerant circuit that returns to 1. In this case, a bypass passage 9 for guiding a part of the high-pressure refrigerant between the discharge pipe 2 and the suction pipe 7
The bypass passage 9 is provided with an electric expansion valve serving as an auxiliary pressure reducer 10, and a heat exchanger 12 with heat radiation fins 11 is disposed on the refrigerant inflow side of the auxiliary pressure reducer 10.

Next, to explain this effect, first of all, for example, when using a cavity, the pressure on the outdoor side! The high-pressure refrigerant compressed in 11all heads to the condenser 3 as shown by the solid line arrow, where it is lowered in temperature, and then to the pressure reducer 5.
The pressure is appropriately reduced at low temperature, and the evaporator 6 is placed indoors.
A refrigeration cycle is obtained which cools the room by absorbing heat at the position and returns to the compressor 1 via the gas-liquid separator 8.

Here, for example, when there is no need to cool the room much, if the rotation speed of the fan (not shown) is extremely reduced,
Inevitably, the amount of air blown to the condenser 3 will decrease, the temperature will rise, and the refrigerant pressure will also rise, but in this case, the high pressure side and low pressure side of the refrigeration cycle are connected by a bypass path 9
Since the bypass ls9 is equipped with a heat exchanger 12 and an auxiliary pressure reducer 10, the valve of the auxiliary pressure reducer 10 opens and a part of the refrigerant is released as heat. The short circuit back to the separator 8 suppresses the rise in high pressure in the refrigerant circuit.

Note that, if necessary, this bypass path 9 may not be branched from the discharge pipe 2 as described above, but may be connected to the
It may also be a bypass path 9a that branches off midway through the compressor 3.
Further, the other end of the bypass path may be a bypass path 9b connected to the inlet side of the evaporator 6 instead of the suction pipe 7. In this way, a part of the gas discharged from the compressor 1 is returned to the evaporator 6. Then, the evaporator 6 will also have a defrosting effect. Moreover, the structure of the heat exchanger 12 of the bypass path 9 does not need to be intentionally provided with the heat radiation fins 11 on the outer periphery as long as it has a length sufficient to cool a part of the gas refrigerant.

Further, FIG. 2 shows another embodiment of the bypass path. That is, in this case, the bypass path 9 has the same structure as the first embodiment, but an auxiliary heat exchanger 13 is further connected between the auxiliary pressure reducer 10 and the suction pipe 7.

In this way, the refrigerant condensed and liquefied in the heat exchanger 12 is depressurized in the auxiliary heat exchanger 13 and then vaporized in the auxiliary heat exchanger 13, so that the liquid refrigerant passes through the gas-liquid separator 8 and is compressed. There is no going back to aircraft 1.

In other words, liquid back-up is prevented.

FIG. 3 shows an embodiment in which a heat exchanger is arranged in a gas-liquid separator.

That is, a heat exchanger 12 provided in a bypass path 9 branching from the discharge pipe 2 of the compressor 1 is installed in the gas-liquid separator 8. In this case, the inside of the gas-liquid separator 8 is heated by the heat exchanger 12, and the liquid back of the liquid refrigerant that returns to the compressor 1 is eliminated.

FIG. 4 shows a case where the heat exchanger and the auxiliary heat exchanger in the second embodiment are integrated. In this case, an auxiliary heat exchanger 13 is disposed in a heat exchanger 12 of a bypass passage 9 via an auxiliary pressure reducer 10, and the entire heat exchanger 14 is a double pipe type heat exchanger 14. The depressurized refrigerant flowing into the auxiliary heat exchanger 13 is efficiently evaporated and vaporized, thereby eliminating liquid backflow to the compressor 1.

Furthermore, FIG. 5 shows another embodiment of the double-tube heat exchanger according to the fourth embodiment.

This is a configuration in which the position of the double-pipe heat exchanger 14 is directly interposed in the bypass passage 9 connecting between the discharge pipe 2 and the suction pipe 7, and heat radiation fins are provided on the outer periphery of the double-pipe heat exchanger 14. 11'
It forms. Further, the auxiliary pressure reducer 10 at this time is interposed between the heat exchanger 12 and the auxiliary heat exchanger 13. In this way, the fins 11' are protruded from the heat exchanger 12 to maximize the heat radiation effect, thereby ensuring the evaporation of the refrigerant in the auxiliary heat exchanger 13 and preventing liquid back up.

<Effects of the Invention> As described above, the refrigeration system of the present invention has at least a heat exchanger and an auxiliary pressure reducer disposed in the bypass path that guides a portion of the high-pressure refrigerant from the high-pressure side to the low-pressure side of the refrigerant circuit. Since the refrigerant is configured to cool part of the refrigerant, the density of the refrigerant increases, for example when using an air conditioner and there is no need to cool the room as much, and when the same weight flow rate is flowing, the refrigerant passes through the pressure reducer. The flow rate decreases. Therefore, refrigerant noise is significantly reduced. That is, since the bypass passage is provided, an increase in high pressure in the refrigerant circuit can be suppressed. Furthermore, by returning a portion of the discharged gas from the pressure ta machine to the evaporator, the evaporator can also be defrosted.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram of the configuration of a refrigeration system, FIG. 2 is a schematic diagram of an embodiment of the bypass, and FIGS. 3 and 4. FIG. 5 is a schematic diagram of another embodiment of the bypass. 1...Compressor, 2...Discharge pipe, 3...Condenser, 5
... pressure reducer, 6 ... evaporator, 7 ... suction pipe, 8.
... Gas-liquid separator, 9... Bypass path, 10... Auxiliary pressure reducer, 11... Heat radiation fin, 12... Heat exchanger, 13... Auxiliary heat exchanger, 14.・Double pipe heat exchanger. Patent applicant: Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A refrigerant circuit is constructed by connecting a compressor, a condenser, a pressure reducer, and an evaporator in a ring, and a portion of the high-pressure refrigerant is guided from the high-pressure side to the low-pressure side of the refrigerant circuit. A refrigeration system including an auxiliary pressure reducer in a bypass path, characterized in that the bypass path is provided with a heat exchanger for cooling a part of high-pressure refrigerant on the refrigerant inflow side of the auxiliary pressure reducer. 2. The refrigeration system according to claim 1, wherein the heat exchanger is a heat exchanger with heat radiation fins. 3. The refrigeration system according to claim 1, wherein the heat exchanger is a heat exchanger disposed on the refrigerant inflow side of the auxiliary pressure reducer and an auxiliary heat exchanger disposed on the refrigerant outflow side of the auxiliary pressure reducer. 4. The refrigeration system according to claim 1, wherein the heat exchanger is disposed within a gas-liquid separator interposed in the suction pipe returning to the compressor. 5. The refrigeration system according to claim 1, wherein the heat exchanger is a double-tube heat exchanger having a double heat exchanger and an auxiliary heat exchanger. 6. Claim 1, wherein the double-pipe heat exchanger is a double-pipe heat exchanger in which an auxiliary pressure reducer is connected between the heat exchanger and the auxiliary heat exchanger, and heat radiation fins are provided on the outer periphery. Refrigeration equipment as described.