JPH0542976U - Temperature controller for cold water for constant temperature room cooling - Google Patents

Abstract

(57) [Summary] [Purpose] When the water cooled by a cooling device is passed through a heat exchanger to cool the inside of a constant temperature room, the set temperature is extremely close to the freezing temperature of the water, and the water temperature is improved to improve the cooling efficiency. There is a risk that freezing will occur if the value is significantly lowered. The present invention
We try to prevent such freezing. [Structure] A thermostat 11 for detecting the temperature of water flowing into the heat exchanger 2 of the constant temperature chamber 1 is provided at the inlet of the heat exchanger 1,
The modulation control valve 12 whose opening is adjusted by the output of the thermostat is provided at the outlet of the primary coil 9a of the evaporator of the water cooling device 3 and the compressor 6
Provided between the suction port of

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In this device, cold water (fresh water or seawater) cooled by a cooling device is supplied to a heat exchanger installed in a constant temperature room such as a storage room to cool the inside of a constant temperature greenhouse, and cold water passing through the heat exchanger is prevented from freezing. The present invention relates to a temperature control device for cold water for cooling a constant greenhouse.

[0002]

[Prior Art]

 As shown in FIG. 2, heat exchangers 2 are installed on the walls, ceiling, floor, etc. of a storage room for storing articles such as fruits and vegetables, foods, etc., which should be stored at low temperature, a cargo compartment of an automobile, a constant temperature chamber 1 such as a container. Is installed, and cold water cooled by the cooling device 3 is circulated through the pipe 4 to cool the inside of the constant temperature room 1.

[0003]

[Problems to be solved by the device]

 In this case, the temperature of the constant greenhouse to be kept is close to the freezing temperature of water, or the cold water temperature should be frozen in fresh water or seawater in order to perform good cooling of the constant greenhouse without increasing the size of the heat exchanger 2. There is a risk that water will freeze in the heat exchanger due to an error in the control mechanism if the temperature is lowered to a temperature extremely close to the temperature. For this reason, the cold water temperature could not be lowered to close to the freezing temperature.

The present invention provides a temperature controller for cold water for cooling a constant greenhouse, which can reduce the temperature of cold water to a temperature close to the freezing temperature of water while eliminating the risk of freezing.

[0005]

[Means for solving the problem]

 The device for controlling the temperature of cold water for cooling the constant temperature room of this invention is a thermostat that detects the temperature of the cold water that flows into the heat exchanger installed in the constant temperature room, and a thermostat that measures the amount of refrigerant gas that exits the evaporator of the refrigerator and is sucked into the compressor. It is configured with a modulation control valve that adjusts according to the detected cold water temperature.

[0006]

[Action]

 The opening of the modulation control valve is changed according to the temperature of the cold water flowing into the heat exchanger of the constant temperature room to adjust the amount of refrigerant gas sucked into the compressor, so the amount of refrigerant evaporated in the evaporator changes. , The degree to which water is cooled can be changed.

Since this adjustment is automatically performed by the temperature of the cold water flowing into the heat exchanger of the constant temperature chamber, the freezing of the cold water is prevented, and at the same time, the cold water temperature is constantly lowered until it becomes extremely close to the freezing temperature. , The constant temperature room can be cooled efficiently.

[0008]

【Example】

 FIG. 1 is a schematic view showing an embodiment of the present invention.

The refrigerant gas is compressed by a compressor 6 driven by a prime mover 5 such as an engine or a motor, cooled by a condenser 7 and liquefied and sent to an expansion valve 8, where it is expanded in a primary coil 9 a of an evaporator 9 and vaporized. Is turned into a low temperature, and the water flowing through the secondary coil 9b is cooled. The refrigerant gas that has cooled the water exits the primary coil 9a, is sucked into the compressor 6, is compressed again, and repeats the above operation. Cold water circulates through the pipe 4 by the pump 10 driven by the prime mover 5, through the secondary coil 9b and the heat exchanger 2.

Numeral 11 detects the temperature of cold water flowing into the heat exchanger 2 and outputs an electric output corresponding to the temperature of the cold water, and a modulation control valve 12 provided downstream of the primary coil 9a of the evaporator. A thermostat 13 for adjusting the opening is an electric circuit.

In the control device configured as described above, when the temperature of the cold water sent to the heat exchanger 2 through the pipe 4 is low enough to prevent freezing, the thermostat 11 opens the valve 12. Therefore, the cold water cooled by the cooling device 3 circulates through the pipe 4 through the heat exchanger 2 and the secondary coil 9b to cool the inside of the low temperature chamber 1 as usual.

When the temperature of the cold water sent from the pipe 4 becomes low and becomes extremely close to the freezing temperature, the thermostat 11 outputs an electric signal to throttle the valve 12 to reduce the amount of refrigerant gas sucked into the compressor 6. Therefore, the amount of refrigerant evaporated in the primary coil 9a of the evaporator 9 is reduced, and the degree of cooling the water flowing through the secondary coil 9b is weakened. As a result, it is possible to avoid the problem that the cold water flowing through the heat exchanger 2 is frozen and the circulation of the water is stopped and the inside of the constant temperature room cannot be cooled.

Although the refrigerating apparatus 3 is arranged outside the constant temperature chamber 1 in the above-described embodiment, the refrigerating apparatus may be provided in a part of the constant temperature chamber.

[0014]

[Effect of the device]

 (1) When the temperature of the cold water flowing through the heat exchanger of the constant temperature chamber drops significantly and approaches the danger of freezing, the modulation control valve 12 immediately reduces the amount of working gas by the signal of the thermostat 11 to reduce the cooling capacity of the evaporator 9. Therefore, the danger of freezing cold water is avoided.

(2) Therefore, the cold water temperature can be made extremely close to the freezing temperature while avoiding the risk of freezing, and the heat exchanger of the constant temperature chamber can be operated efficiently.

(3) Therefore, the heat exchanger of the constant temperature chamber can be downsized, so that the facility cost can be reduced and the volume utilization rate of the constant temperature chamber can be increased.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of the present invention.

FIG. 2 is a schematic diagram illustrating a conventional device for cooling a constant temperature greenhouse with cold water.

[Explanation of sign]

 1 Constant greenhouse 2 Heat exchanger 3 Cooling device 4 Pipe 5 Motor 6 Compressor 7 Condenser 8 Expansion valve 9 Evaporator 9a Primary coil 9b Secondary coil 10 Pump 11 Thermostat 12 Modulation control valve 13 Electric circuit

Claims (1)

[Scope of utility model registration request] 1. A device for cooling the inside of a constant temperature chamber by circulating cold water cooled by a cooling device (3) through a pipe (4) to a heat exchanger (2) installed in the constant temperature chamber (1). A modulation control valve (12) is provided between the outlet of the primary coil (9a) of the evaporator (9) of (3) and the inlet of the compressor (6),
When the temperature of the water flowing into the heat exchanger (2) between the outlet of the secondary coil (9b) of the evaporator (9) and the inlet of the heat exchanger (2) of the constant temperature chamber becomes extremely close to the freezing temperature. A temperature control device for cold water for cooling a constant temperature greenhouse, comprising a thermostat (11) for narrowing down a modulation control valve (12).