JPH06241583A - Freezer device - Google Patents

Abstract

PURPOSE:To perform a control over the most appropriate volume of a gas cooler in response to a load of a compressor and a variation in condition of surrounding air temperature in a freezing device provided with the gas cooler, and to perform a control of heating calorie of refrigerant gas applied in a defrosting operation of an evaporator in compliance with a frosted condition of the evaporator. CONSTITUTION:In a freezing device comprising a main refrigerant circuit having a compressor 1, a condensor 3, a throttling device 4 and an evaporator 6, and a gas cooler circuit having a gas cooler 13 connected between a pipe communicated with a compression chamber 11 of the compressor 1 and another pipe communicated with an inside part of a shell of the compressor, an inlet pipe 12 of the gas cooler 13 and an inlet pipe 2 of the condensor 3 are connected by a bypassing circuit 16. This bypassing circuit 16 is opened or closed by a solenoid valve 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration system equipped with a gas cooler circuit.

[0002]

2. Description of the Related Art FIG. 7 is a refrigerant circuit diagram of a refrigerating apparatus having a conventional gas cooler circuit. In the figure, 1 is a compressor, 2 is a discharge pipe that connects the compressor 1 and the condenser 3, and 4 is a throttle device that connects the condenser 3 and is connected by a liquid pipe 5. An evaporator 6 is connected to the expansion device 4, and is connected to the evaporator inlet pipe 7. 8 is an evaporator 6
The pipe 10 connecting the compressor suction port 9 with the compressor 10 is a motor for driving the compressor 1 inside the compressor 1, and 11 is a compression chamber. The pipe 12 communicating with the compression chamber 11 is connected to the gas cooler 13. The gas cooler outlet pipe 14 is connected to the gas cooler 13 and a connection port 15 near the motor 10 arranged inside the compressor 1.

Next, the operation will be described. The refrigerant gas sucked from the suction port 9 enters the compression chamber 11, is compressed, is once discharged to the outside of the compressor 1 through the gas cooler inlet pipe, is cooled by the gas cooler 13, and is discharged to the compressor 1 through the gas cooler outlet pipe 14. After returning, the heat of the motor 10 is taken away, and then it enters the condenser 3 through the discharge pipe 2, is squeezed by the expansion device 4, and is evaporated by the evaporator 6.

[0004]

Since the conventional apparatus is configured as described above, it is very difficult to set the gas cooler when the apparatus is used in a wide evaporation temperature range. That is, when the load is large and the ambient temperature of the compressor is high, the discharge pressure and discharge temperature of the compressor are likely to rise excessively, so it is necessary to set the gas cooler capacity to a large value. Further, when the ambient temperature of the compressor becomes low, the refrigerant gas from the gas cooler set to a larger size becomes a liquid state and is returned to the compressor, so that the lubricating oil in the compressor is diluted with the liquid refrigerant, resulting in poor lubrication of the compressor. There was a problem that caused damage to the compressor.

When defrosting the evaporator with this apparatus,
Although hot gas is taken out from the condenser inlet pipe, the temperature of the taken hot gas is low because it is cooled by the gas cooler, and there is not enough heat to defrost the evaporator, which causes a problem that reduces defrosting performance. there were.

The present invention has been made to solve the above problems, and a first object of the present invention is to increase the gas cooler capacity in accordance with the load of the compressor and changes in ambient temperature conditions. It is to provide a refrigerating apparatus that can be appropriately controlled. A second object is to provide a refrigeration system capable of controlling the heat quantity of hot gas taken out when defrosting the evaporator.

[0007]

Means for Solving the Problems The following measures have been taken in the present invention. That is, in the invention of claim 1, between the main refrigerant circuit including the compressor, the condenser, the expansion device, and the evaporator, and the pipe communicating with the compression chamber of the compressor and the pipe communicating with the inside of the compressor shell. A refrigerating apparatus including a gas cooler circuit including a connected gas cooler, the first connecting the inlet pipe of the gas cooler and the inlet pipe of the condenser.
The bypass circuit and the first opening / closing means for opening / closing the first bypass circuit are provided.

Further, in the invention of claim 2, a three-way valve may be provided which is connected to the compression chamber of the compressor, the inlet of the gas cooler and the outlet of the gas cooler in communication with each other. Further, according to the invention of claim 3, a first bypass circuit connecting the inlet pipe of the gas cooler and the condenser inlet pipe, a first opening / closing means for opening / closing the first bypass circuit, and the gas And a fan controller for controlling a fan provided in the cooler. Further, in the invention of claim 4, a main refrigerant circuit, a gas cooler circuit, a gas cooler inlet pipe communicating with the compression chamber of the compressor, and an evaporator inlet pipe connecting the expansion device and the evaporator are provided. In a refrigerating apparatus provided with the second cooler, wherein the gas cooler inlet pipe and the evaporator inlet pipe are connected via a second opening / closing means.
Equipped with a bypass circuit.

Further, according to the invention of claim 5, a second bypass circuit for connecting the gas cooler inlet pipe and the evaporator inlet pipe through a second opening / closing means, the condenser inlet pipe and the evaporator are provided. A third bypass circuit was formed to connect the container inlet pipe via the third opening / closing means. Further, in the invention of claim 6, in a refrigerating device including a main refrigerant circuit and a gas cooler circuit, a fourth bypass circuit connecting the gas cooler inlet pipe and the gas cooler outlet pipe, and the fourth And a fourth opening / closing means for opening / closing the bypass circuit.

[0010]

According to the invention of claim 1, between the main refrigerant circuit consisting of the compressor, the condenser, the expansion device and the evaporator, between the pipe communicating with the compression chamber of the compressor and the pipe communicating with the inside of the compressor shell. A gas cooler circuit including a gas cooler connected to the first cooler circuit, and a first bypass circuit connecting the inlet pipe of the gas cooler and the condenser inlet pipe, and opening and closing the first bypass circuit. Since the first opening / closing means is provided, the flow rate of the cooling gas from the gas cooler to the compressor can be controlled by operating the first opening / closing means according to the load of the compressor and changes in ambient temperature conditions.
Further, in the invention of claim 2, since the three-way valve connected to the compression chamber of the compressor, the inlet of the gas cooler, and the outlet of the gas cooler is connected, The flow rate of the cooling gas from the gas cooler to the compressor can be controlled according to the load of the compressor and changes in ambient temperature conditions. Further, according to the invention of claim 3, since the fan controller for controlling the fan provided in the gas cooler is provided, it is possible to control the air flow rate to the gas cooler according to the change of the temperature condition of the condenser. Further, in the invention of claim 4, a main refrigerant circuit, a gas cooler circuit, a gas cooler inlet pipe communicating with the compression chamber of the compressor, and an evaporator inlet pipe connecting the expansion device and the evaporator are provided. Since the refrigerating apparatus provided with the second bypass circuit connecting the gas cooler inlet pipe and the evaporator inlet pipe via the second opening / closing means, the high-temperature refrigerant gas compressed by the compressor is supplied. Supply to the evaporator to improve defrosting performance. In the invention of claim 5, a second bypass circuit connecting the gas cooler inlet pipe and the evaporator inlet pipe through a second opening / closing means, the condenser inlet pipe and the evaporator inlet pipe. And a third connecting means via a third opening / closing means.
Since the bypass circuit is formed, the refrigerant gas having an appropriate temperature can be taken out and an appropriate amount of heat can be supplied to the evaporator according to the conditions for defrosting the evaporator. Further, in the invention of claim 6, in a refrigerating device including a main refrigerant circuit and a gas cooler circuit, a fourth bypass circuit connecting the gas cooler inlet pipe and the gas cooler outlet pipe, and the fourth Since it has the fourth opening / closing means for opening / closing the bypass circuit, the amount of gas flowing to the gas cooler can be reduced and the amount of gas flowing to the bypass pipe side can be increased in the same manner as described above.

[0011]

【Example】

Example 1. Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIG. A compressor 1 is connected to a condenser 3 by a discharge pipe 2, and the liquid line side of the condenser 3 is connected by a liquid pipe 5 to a throttle device 4 such as a capillary or an expansion valve. The expansion device 4 and the evaporator 6 are connected by an evaporator inlet pipe 7. The evaporator 6 and the compressor suction port 9 are connected by a pipe 8. A motor 10 drives a rolling piston (not shown) of the compressor 1. Reference numeral 11 is a compression chamber of the compressor 1.
The gas cooler inlet pipe 12 communicating with 1 is connected to the gas cooler 13. Gas cooler outlet piping 14
Connects the gas cooler 13 and the compressor 1, and the connection port 15 on the compressor 1 side is provided near the motor 10. 16 is a gas cooler inlet pipe 12 and a discharge pipe 2
Is a first bypass circuit for bypassing the gas cooler 13 and the condenser 3 before entering the condenser 3 and is controlled to be opened / closed by a solenoid valve 17 as a first opening / closing means. 18
Is a temperature sensor for detecting the gas temperature in the pipe 12 at the gas cooler inlet of the compressor 1, and controls the opening / closing of the solenoid valve 17 via the control circuit 19.

Next, the operation will be described. First, since the discharge gas temperature easily rises under the condition that the load is large and the ambient temperature of the compressor is high or the pressure difference between the high pressure and the low pressure of the compressor 1 is large, the refrigerant gas sucked from the suction port 9 is
1, is compressed, and is once discharged to the outside of the compressor 1 through the pipe 12 at the gas cooler inlet. At this time, the discharge gas temperature is detected by the temperature sensor 18, and if it is higher than the set temperature, the bypass solenoid valve 17 is passed through the control circuit 19.
Close. Then, the entire amount of the refrigerant gas discharged through the gas cooler inlet pipe 12 is cooled by the gas cooler 13 and returns to the connection port 15 of the compressor 1 through the gas cooler outlet pipe 14 to remove heat from the motor 10 to remove the entire compressor 1. After the temperature is lowered, it enters the condenser 3 through the discharge pipe 2, is squeezed by the expansion device 4, and is evaporated by the evaporator 6.

The temperature of the discharge gas is lower than the set value because the discharge gas temperature hardly rises under the condition that the pressure difference between the compressor 1 and the compressor is small and the ambient temperature of the compressor is low. The bypass solenoid valve 17 is opened via the control circuit 19. Therefore, a part of the discharge gas that is compressed in the compression chamber 11 and is once discharged to the outside of the compressor 1 through the pipe 12 at the gas cooler inlet passes through the bypass pipe 16 and the solenoid valve 14 due to the pressure difference, and then the discharge pipe 2 To be bypassed. In addition, a part of the discharged refrigerant gas is
After flowing into the gas cooler 13 as it is and cooled, the connection port 1 of the compressor 1 is passed through the gas cooler outlet pipe 14.
5, the heat of the motor 10 is taken to lower the temperature of the compressor 1 as a whole, and then mixed with the high-temperature refrigerant gas bypassed from the bypass pipe 16 through the discharge pipe 2 to enter the condenser 3 and enter the expansion device 4 And is evaporated by the evaporator 6.

Example 2. In FIG. 2, one connection port of the three-way valve 20 is connected to the other end of the gas cooler inlet pipe 12 communicating with the compression chamber 11, and one of the remaining two connection ports is connected. Is connected to the gas cooler 13 by the pipe 21, and the last connection port is connected to the gas cooler outlet pipe 14 by the pipe 22.

Next, the operation will be described. Under a condition that the load is large and the ambient temperature of the compressor is high, or a pressure difference between the high pressure and the low pressure of the compressor 1 is large, the discharge gas temperature is detected by the temperature sensor 18, and the three-way valve 20 is detected via the control circuit 23.
To control. That is, since the three-way valve 20 connects the pipe 12 and the pipe 21 at the gas cooler inlet to each other and closes the pipe 22 side, the pipe 12 at the gas cooler inlet 12 is closed.
The entire amount of the refrigerant gas discharged through the gas cooler 13 is cooled by the gas cooler 13, and the refrigerant gas is discharged through the gas cooler outlet pipe 14.
After returning to the connection port 15 of the compressor 10 to remove the heat of the motor 10 to lower the temperature of the compressor 1 as a whole, the condenser 3 is passed through the discharge pipe 2.
The liquid is squeezed by the expansion device 4 and evaporated by the evaporator 6. Further, under the condition that the pressure difference of the compressor 1 is small and the compressor ambient temperature is low, the discharge gas temperature is detected by the temperature sensor 18, and the three-way valve 20 is connected to the gas cooler inlet pipe 12 via the control circuit 23. And the pipe 22 side are communicated with each other, and the pipe 21 side is controlled to be closed. Therefore,
The gas compressed in the compression chamber 11 returns to the connection port 15 of the compressor 1 again without being cooled by the gas cooler 13.

Embodiment 3. In FIG. 3, a fan 24 attached to assist the heat treatment in the gas cooler 13 is added to the cycle of FIG. 1, and a fan controller 25 for controlling the fan 24 is further provided. The fan controller 25 includes a temperature sensor 26 for detecting the temperature of the condenser 2.
Signal is being input. Next, the operation will be described. When the temperature of the condenser 3 is equal to or lower than the specified temperature, it is not necessary to actively perform heat exchange in the gas cooler 13. Therefore, based on a signal from the temperature sensor 26, the rotation speed of the fan 24 via the fan controller 25. Decrease or stop altogether. On the contrary, when the temperature of the condenser 3 is equal to or higher than the specified temperature, it is necessary to actively perform the heat exchange in the gas cooler 13, and therefore the fan controller 25 increases the rotation speed of the fan 24 to the full speed.

Embodiment 4. Next, FIG. 4 will be described. 1
Is a compressor and is connected to a condenser 3 by a discharge pipe 2, and the liquid line side of the condenser 3 is connected by a liquid pipe 5 to a throttle device 4 such as a capillary or an expansion valve. The expansion device 4 and the evaporator 6 are connected by an evaporator inlet pipe 7. The evaporator 6 and the compressor suction port 9 are connected by a pipe 8. Reference numeral 10 is a motor that drives a rolling piston (not shown) of the compressor 1 and the like, and 11 is a compression chamber of the compressor 1. The gas cooler inlet pipe 12 communicating with the compression chamber 11 is connected to the gas cooler 13. The gas cooler outlet pipe 14 connects the gas cooler 13 and the compressor 1, and the connection port 15 on the compressor 1 side is provided near the motor 10. Further, the gas cooler inlet pipe 12 and the evaporator inlet pipe 7 are connected by a defrost bypass pipe 27 as a second bypass circuit, and the bypass pipe 27 is provided with a solenoid valve 28 as a second opening / closing means.

Next, the operation will be described. This cycle works effectively when performing hot gas defrosting. That is, during the defrost operation, the electromagnetic valve 28 is opened, so that the high-temperature refrigerant gas compressed in the compression chamber 11 passes through the defrost bypass pipe 27 and the electromagnetic valve 28, and then joins with the evaporator inlet pipe 7. And supplies the high temperature refrigerant gas to the evaporator 6.

Example 5. In addition to the cycle of FIG. 4, FIG. 5 branches the discharge pipe 2 in the middle of entering the condenser 3 from the defrost bypass pipe 29 as a third bypass circuit, and connects it to the evaporator inlet pipe 7. Bypass pipe 29
Is equipped with a solenoid valve 30 as a third opening / closing means. Next, the operation will be described. The temperature of the evaporator 6 is detected by the temperature sensor 31, and the open / close states of the electromagnetic valves 28 and 30 are controlled via the control circuit 32.
That is, when it is necessary to rapidly melt the frost of the evaporator 6,
The solenoid valve 28 is opened and the solenoid valve 30 is closed,
The high-temperature refrigerant gas is used for the defrost bypass pipe 27 and the solenoid valve 2.
After passing through 8, it joins the evaporator inlet pipe 7 and supplies the high temperature refrigerant gas to the evaporator 6. When it is necessary to melt the frost of the evaporator 6 over time, the solenoid valve 30 is opened and the solenoid valve 28 is closed, so that the gas cooler 1 is closed.
After being cooled by 3, the gas cooler outlet pipe 14 passes through, the gas that has deprived the heat of the motor 10 passes through the discharge pipe 2, and passes through the defrost bypass pipe 29 and the solenoid valve 30.
The high temperature refrigerant gas is combined with the evaporator inlet pipe 7 to cool the evaporator 6
Supply to.

Example 6. Further, as shown in FIG. 6, the gas cooler inlet pipe 12 and the gas cooler outlet pipe 14 are connected by a fourth bypass circuit 33, and the fourth bypass circuit is connected by a solenoid valve 34 as a fourth opening / closing means. 33 may be configured to open and close. Next, the operation will be described. Under a condition that the load is large and the ambient temperature of the compressor is high, or a condition that the pressure difference between the high pressure and the low pressure of the compressor 1 is large, the temperature of the discharge gas is likely to rise, so that the refrigerant gas sucked from the suction port 9 is Enters the compression chamber 11 and is compressed,
It is once discharged to the outside of the compressor 1 through the gas cooler inlet pipe 12. At this time, the solenoid valve 34 of the bypass circuit 33 is closed via the control circuit 36 by the instruction from the temperature sensor 35 that detects the temperature of the discharge pipe 2, and the refrigerant gas discharged through the gas cooler inlet pipe 12 is The entire amount is cooled by the gas cooler 13, and the gas cooler outlet pipe 1
After returning to the compressor 1 through 4 and lowering the temperature of the entire compressor, it enters the condenser 3 through the discharge pipe 2, is throttled by the expansion device 4, and is evaporated by the evaporator 6. On the other hand, the compressor 1
Under the condition that the pressure difference between the high pressure and the low pressure is small and the ambient temperature of the compressor is low, the electromagnetic valve 34 is opened according to the instruction of the temperature sensor that detects the temperature of the discharge gas.
A part of the gas compressed in 1 returns to the connection port 15 of the compressor 1 via the bypass circuit 33, and a part of the remaining gas flows into the gas cooler 13 and is cooled to be connected to the connection port 15 of the compressor 1. Return to. Here, by appropriately selecting the diameters of the fourth bypass circuit 33 and the solenoid valve 34, the amount of refrigerant gas flowing to the gas cooler 13 and the bypass circuit 33 side can be increased without using expensive parts such as a three-way valve. The amount of flowing refrigerant gas can be controlled.

[0021]

As described above, according to the refrigerating apparatus of the invention of claim 1 of the present invention, the capacity of the gas cooler can be optimally controlled according to the load of the compressor and the change of the ambient temperature condition, and the compression can be performed. It is possible to prevent overheating of the machine and also to prevent the refrigerant gas in a liquid state from being returned to the compressor. Further, according to the refrigerating apparatus of the invention of claim 2, the capacity of the gas cooler can be optimally controlled according to the load of the compressor and the change of the ambient temperature condition, the overheating of the compressor can be prevented, and the liquid It is possible to prevent the refrigerant gas in the state from being returned to the compressor. Further, according to the refrigerating apparatus of the invention of claim 3, proper heat exchange can be performed by assisting the heat exchange in the gas cooler according to the state of the condenser by the fan. Further, according to the invention of claim 4, it is possible to obtain an effect that the defrosting ability is enhanced and defrosting can be performed in a short time. Also,
According to the invention of claim 5, the heat quantity of the refrigerant gas used when the defrosting operation of the evaporator is performed can be controlled according to the frosted state of the evaporator. Further, according to the invention of claim 6, it is possible to control the amount of the refrigerant gas flowing to the gas cooler without using expensive parts such as a three-way valve.

[Brief description of drawings]

FIG. 1 is a system diagram of a refrigeration system including a gas cooler according to a first embodiment of the present invention.

FIG. 2 is a system diagram of a refrigeration system including a gas cooler according to a second embodiment of the present invention.

FIG. 3 is a system diagram of a refrigeration system including a gas cooler according to a third embodiment of the present invention.

FIG. 4 is a system diagram of a refrigeration system including a gas cooler according to a fourth embodiment of the present invention.

FIG. 5 is a system diagram of a refrigeration system including a gas cooler according to a fifth embodiment of the present invention.

FIG. 6 is a system diagram of a refrigeration system including a gas cooler according to a sixth embodiment of the present invention.

FIG. 7 is a system diagram of a refrigeration system including a gas cooler according to a conventional example.

[Explanation of symbols]

 1 Compressor 2 Discharge pipe 3 Condenser 4 Throttle device 5 Liquid pipe 6 Evaporator 7 Evaporator inlet pipe 8 Evaporator outlet pipe 9 Compressor inlet 10 Motor 11 Compressor chamber 12 Gas cooler inlet pipe 13 Gas cooler 14 Gas cooler outlet Piping 15 Connection port 16 Bypass pipe (first bypass circuit) 17 Electromagnetic valve (first opening / closing means) 18 Temperature sensor (temperature detection means) 19 Control circuit 20 Three-way valve 21 Piping 22 Piping 23 Control circuit 24 Fan 25 Fan controller 26 Temperature Sensor (Temperature Detecting Means) 27 Defrost Bypass Pipe (Second Bypass Circuit) 28 Electromagnetic Valve (Second Opening / Closing Means) 29 Defrosting Bypass Pipe (Third Bypass Circuit) 30 Electromagnetic Valve (Third Opening and Closing Means) 31 temperature sensor (temperature detection means) 32 control circuit 33 bypass pipe (fourth bypass Scan circuit) 34 solenoid valve (fourth switching means) 35 temperature sensor (temperature detecting means) 36 control circuit

Claims (6)

[Claims] 1. A gas connected between a main refrigerant circuit including a compressor, a condenser, a throttle device, and an evaporator, and a pipe communicating with a compression chamber of the compressor and a pipe communicating with a compressor shell. In a refrigeration apparatus including a gas cooler circuit including a cooler, a first bypass circuit connecting an inlet pipe of the gas cooler and a condenser inlet pipe, and a first opening / closing opening / closing the first bypass circuit. And a refrigerating apparatus. 2. A gas connected between a main refrigerant circuit consisting of a compressor, a condenser, a throttle device, and an evaporator, a pipe communicating with the compression chamber of the compressor, and a pipe communicating with the inside of the compressor shell. A refrigeration apparatus including a gas cooler circuit including a cooler, comprising a three-way valve connected to the compression chamber of the compressor, an inlet of the gas cooler, and an outlet of the gas cooler. Refrigerating device. 3. A gas connected between a main refrigerant circuit including a compressor, a condenser, a throttle device, and an evaporator, a pipe communicating with the compression chamber of the compressor, and a pipe communicating with the inside of the compressor shell. In a refrigeration apparatus including a gas cooler circuit including a cooler, a first bypass circuit connecting an inlet pipe of the gas cooler and a condenser inlet pipe, and a first opening / closing opening / closing the first bypass circuit. A refrigerating apparatus comprising: means and a fan controller that controls a fan provided in the gas cooler. 4. A gas connected between a main refrigerant circuit including a compressor, a condenser, a throttle device, and an evaporator, a pipe communicating with the compression chamber of the compressor, and a pipe communicating with the inside of the compressor shell. A gas cooler inlet pipe, comprising a gas cooler circuit including a cooler, a gas cooler inlet pipe communicating with a compression chamber of the compressor, and an evaporator inlet pipe connecting the expansion device and the evaporator. And a second connecting means for connecting the evaporator inlet pipe and the evaporator inlet pipe through a second opening / closing means.
A refrigerating device comprising a bypass circuit of. 5. A gas connected between a main refrigerant circuit consisting of a compressor, a condenser, a throttle device, and an evaporator, a pipe communicating with the compression chamber of the compressor, and a pipe communicating with the inside of the compressor shell. A gas cooler circuit including a cooler, a gas cooler inlet pipe communicating with the compression chamber of the compressor, an evaporator inlet pipe connecting the expansion device and the evaporator, and a condenser connecting the compressor and the condenser. A refrigerating apparatus including a gas inlet port pipe, wherein the gas cooler inlet pipe and the evaporator inlet pipe are connected via a second opening / closing means.
And a third bypass circuit for connecting the condenser inlet pipe and the evaporator inlet pipe via a third opening / closing means. 6. A gas connected between a main refrigerant circuit including a compressor, a condenser, a throttle device, and an evaporator, a pipe communicating with a compression chamber of the compressor, and a pipe communicating with the inside of a compressor shell. A refrigerating apparatus including a gas cooler circuit including a cooler, a fourth bypass circuit connecting an inlet pipe of the gas cooler and the gas cooler outlet pipe,
And a fourth opening / closing means for opening / closing the fourth bypass circuit.