JP5176978B2 - Cooling system - Google Patents

Description

  The present invention relates to a cooling device, and more particularly, to a cooling device including an evaporator that is detachable from a refrigerant circuit.

  2. Description of the Related Art Conventionally, a cooling device including a refrigerant circuit and an evaporator that can be detached through a desorption mechanism such as a coupling is known (see, for example, Patent Document 1).

  FIG. 2 is a refrigerant circuit diagram illustrating an example of a conventional cooling device. As shown in FIG. 2, this conventional cooling apparatus includes a compressor 1, a condenser 2, an evaporator 4 provided in the ice making machine 3, a refrigerant pipe 5 connecting them, and a condenser fan 6. The refrigerant circuit is provided. The evaporator 4 is detachably connected to the refrigerant circuit via a desorption mechanism section 7 on the upstream side and a desorption mechanism section 8 on the downstream side.

  In the configuration of FIG. 2, when there is an operation command to the ice making machine 3, the compressor 1 is operated and the release valve 9 is opened, and the high-temperature refrigerant pressurized by the compressor 1 is After being cooled and condensed by the condenser 2, it passes through the dryer 10 and reaches the release valve 9.

  The refrigerant decompressed by the expansion valve 11 becomes a low temperature, reaches the evaporator 4, and evaporates while making ice in the ice making machine 3. Thereafter, it passes through the check valve 12 and the accumulator 13 and returns to the compressor 1. This cycle is repeated and necessary ice storage is performed by the ice making machine 3. Here, when the compressor 1 is stopped, the evaporator 4 can be disconnected from the refrigerant circuit by detaching the desorption mechanism unit 7 and the desorption mechanism unit 8 from the refrigerant circuit.

JP 2006-71251 A

By the way, when the refrigerant used in the above-described conventional cooling device is a natural refrigerant such as carbon dioxide (CO ₂ ), the refrigerant pressure when the compressor is stopped is much higher than that of the chlorofluorocarbon refrigerant. Therefore, the desorption operation of the desorption mechanism when desorbing the evaporator is dangerous and difficult. Moreover, there is a risk of damage to the desorption mechanism.

  This invention is made | formed in view of the said situation, and it aims at providing the cooling device which can reduce the refrigerant | coolant pressure before and behind a desorption mechanism part at the time of a stop of a compressor.

In order to achieve the above object, a cooling device according to claim 1 of the present invention includes an evaporator detachably connected to a refrigerant circuit including a refrigerant pipe connected to a compressor via a desorption mechanism. In the cooling apparatus for an ice making machine, the refrigerant pipe branched from the refrigerant pipe connected to the desorption mechanism section upstream from the evaporator and connected to the desorption mechanism section downstream from the evaporator A branch pipe for flowing the refrigerant from the compressor without passing through the evaporator and the desorption mechanism section, and a refrigerant pipe connected to the desorption mechanism section on the upstream side as viewed from the evaporator , A valve capable of closing the flow path of the refrigerant pipe downstream from the point where the branch pipe branches, and a refrigerant pipe connected to the desorption mechanism section downstream from the evaporator , wherein the branch pipe is or refrigerant pipe downstream of the point of connection And a non-return mechanism for preventing reverse flow of refrigerant to the evaporator, when said by desorption operation of detaching mechanism portion performs disconnection of the evaporator from the refrigerant circuit, temporarily stopping the compressor, By closing the valve and restarting the compressor, the refrigerant flows through the branch pipe, passes through the check mechanism, returns to the compressor, and the front and rear of the desorption mechanism section are connected to the compressor. When the compressor is stopped in this state due to the suction force, the circuit on the evaporator side is closed by the check mechanism and the valve, and the front and rear of the desorption mechanism portion are maintained in a low pressure state. The desorption mechanism section can be separated from the refrigerant circuit .

  The cooling device according to claim 2 of the present invention is characterized in that in claim 1 described above, the cooling device further includes a valve capable of closing the flow path of the branch pipe.

  The cooling device according to claim 3 of the present invention is characterized in that in claim 1 or 2, the refrigerant is carbon dioxide.

  According to the present invention, in a cooling device having an evaporator detachably connected to a refrigerant circuit composed of refrigerant piping connected to a compressor via a desorption mechanism, the upstream side of the evaporator as viewed from the evaporator. The compressor is branched from the refrigerant pipe connected to the desorption mechanism section, connected to the refrigerant pipe connected to the desorption mechanism section on the downstream side as viewed from the evaporator, and does not pass through the evaporator and the desorption mechanism section. A branch pipe for flowing the refrigerant from the evaporator, a valve capable of closing the flow path of the refrigerant pipe connected to the desorption mechanism section upstream from the evaporator, and the desorption mechanism section downstream from the evaporator And a non-return mechanism for preventing the reverse flow of the refrigerant from the refrigerant pipe connected to the evaporator, so that after the compressor is stopped and the valve is closed, the compressor is restarted. The refrigerant must pass through the evaporator and desorption mechanism. After flowing through the branch pipe, the flow returns to the compressor through the return mechanism. When the compressor is operated for a while, the refrigerant pressure before and after the desorption mechanism part becomes a low pressure state due to the suction action by the compressor. be able to.

  A preferred embodiment of a cooling device according to the present invention will be described below in detail with reference to the accompanying drawings, taking as an example the case of being used in an ice making machine. FIG. 1 is a refrigerant circuit diagram of a cooling device according to the present invention.

As shown in FIG. 1, the cooling device 100 of the present invention includes a refrigerant circuit comprising a compressor 20, a gas cooler 22 as a condenser, an evaporator 26 provided in an ice making machine 24, and a refrigerant pipe 28 connecting them. Comprising a branch pipe 30 and a condenser fan 32. Carbon dioxide (CO ₂ ) can be used as the refrigerant. The evaporator 26 is detachably connected to the refrigerant circuit via a desorption mechanism section 34 on the upstream side as viewed from the evaporator 26 and a desorption mechanism section 36 on the downstream side as viewed from the evaporator 26.

  The branch pipe 30 is for flowing the refrigerant from the compressor 20 without passing through the evaporator 26 and the desorption mechanism sections 34 and 36, and from the point A of the refrigerant pipe 28 connected to the upstream desorption mechanism section 34. It branches and is connected to the point B of the refrigerant pipe 28 connected to the desorption mechanism part 36 on the downstream side.

  The cooling device 100 includes a first opening valve 46 as a valve capable of closing the flow path of the refrigerant pipe 28 connected to the upstream side desorption mechanism 34 and a valve as a valve capable of closing the flow path of the branch pipe 30. A second release valve 48 and a check valve 50 as a check mechanism are provided. The first release valve 46 is provided in the refrigerant pipe 28 downstream from the branch point A, and the second release valve 48 is provided in the branch pipe 30. The check valve 50 is provided in the refrigerant pipe 28 on the downstream side of the point B.

  The cooling device 100 further includes an electronic expansion valve 38, a strainer 40, an internal heat exchanger 42, and a capillary 44. The electronic expansion valve 38 is provided in the refrigerant pipe 28 upstream from the point A, and the strainer 40 is provided between the electronic expansion valve 38 and the gas cooler 22. The internal heat exchanger 42 is provided between the electronic expansion valve 38 and the strainer 40. The capillary 44 is provided between the first release valve 46 and the desorption mechanism 34.

The operation and action of the above configuration will be described.
When there is an operation command from the control unit (not shown) to the ice making machine 24, the compressor 20 is activated, the electronic expansion valve 38 and the first opening valve 46 are opened, and the second opening valve 48 is closed.

  The high-pressure refrigerant pressurized by the compressor 20 is cooled by the gas cooler 22 and further cooled by the internal heat exchanger 42 after passing through the strainer 40. Thereafter, the refrigerant decompressed by the electronic expansion valve 38 and the capillary 44 becomes a low temperature, reaches the evaporator 26, and evaporates while making ice by the ice making machine 24.

  Thereafter, the refrigerant again passes through the internal heat exchanger 42, is heated at that time, passes through the check valve 50, and returns to the compressor 20. Here, when the evaporator 26 is separated from the refrigerant circuit by the desorption operation of the desorption mechanism portions 34 and 36, the compressor 20 is temporarily stopped, the first release valve 46 is closed, and the second release valve is closed. 48 is opened and the compressor 20 is restarted. Thus, after the refrigerant flows through the branch pipe 30, the refrigerant goes to the internal heat exchanger 42 to return to the compressor 20, and then passes through the check valve 50 and returns to the compressor 20.

  After operating for a while, the front and rear of the desorption mechanism sections 34 and 36 are in a low pressure state due to the suction force to the compressor 20. When the compressor 20 is stopped in this state and the second release valve 48 is closed at the same time, the circuit on the evaporator 26 side is closed by the check valve 50, the first release valve 46, and the second release valve 48. The front and back of the mechanical parts 34 and 36 are held at a low pressure. In this state, the desorption mechanism sections 34 and 36 can be easily and safely separated from the refrigerant circuit.

  As described above, according to the present invention, the refrigerant pipe branched from the refrigerant pipe connected to the upstream desorption mechanism section viewed from the evaporator and connected to the downstream desorption mechanism section viewed from the evaporator is provided. A branch pipe that connects and flows the refrigerant from the compressor without passing through the evaporator and the desorption mechanism, and a valve that can block the flow path of the refrigerant pipe that is connected to the desorption mechanism on the upstream side when viewed from the evaporator; Since it has a check mechanism that prevents the reverse flow of the refrigerant from the refrigerant pipe connected to the desorption mechanism section on the downstream side when viewed from the evaporator, the compressor is temporarily stopped to close the valve, and then compressed. When the machine is restarted, the refrigerant in the refrigerant pipe flows through the branch pipe without passing through the evaporator and the desorption mechanism, and then returns to the compressor through the check mechanism. When the compressor is operated for a while, the refrigerant pressure before and after the desorption mechanism part becomes a low pressure state due to the suction action by the compressor. be able to.

It is a refrigerant circuit figure which shows an example of the cooling device which concerns on this invention. It is a refrigerant circuit diagram which shows an example of the conventional cooling device.

DESCRIPTION OF SYMBOLS 20 Compressor 22 Gas cooler 24 Ice maker 26 Evaporator 28 Refrigerant piping 30 Branch piping 32 Condenser fan 34,36 Desorption mechanism part 38 Electronic expansion valve 40 Strainer 42 Internal heat exchanger 44 Capillary 46 1st release valve 48 2nd release valve 50 Check valve 100 Cooling device

Claims (3)

In a cooling device for an ice making machine having an evaporator that is detachably connected via a desorption mechanism unit to a refrigerant circuit composed of refrigerant piping connected to a compressor,
Branched from a refrigerant pipe connected to the desorption mechanism section upstream from the evaporator, and connected to a refrigerant pipe connected to the desorption mechanism section downstream from the evaporator, the evaporator and the evaporator A branch pipe that allows the refrigerant from the compressor to flow without passing through the desorption mechanism section, and a refrigerant pipe that is connected to the desorption mechanism section on the upstream side as viewed from the evaporator, where the branch pipe is branched. and capable of closing the valve on the downstream side flow path of the refrigerant pipe, a refrigerant pipe connected to the releasable mechanism portion downstream from the evaporator, the refrigerant downstream of the point where the branch pipe is connected A check mechanism for preventing a reverse flow of the refrigerant from the pipe to the evaporator ,
When separating the evaporator from the refrigerant circuit by the desorption operation of the desorption mechanism,
By temporarily stopping the compressor, closing the valve, and restarting the compressor, the refrigerant flows through the branch pipe, passes through the check mechanism, returns to the compressor, and the desorption mechanism unit. Before and after, the suction force to the compressor causes a low pressure state. When the compressor is stopped in this state, the circuit on the evaporator side is closed by the check mechanism and the valve, and the front and rear of the desorption mechanism portion are low pressure. A cooling device characterized in that it is held in a state, and in this state, the desorption mechanism section can be separated from the refrigerant circuit .   The cooling device according to claim 1, further comprising a valve capable of closing the flow path of the branch pipe.   The cooling device according to claim 1 or 2, wherein the refrigerant is carbon dioxide.

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