JPH0626743A - Anti-freeze device for flooded cooler - Google Patents

Abstract

PURPOSE:To raise a temperature on a refrigerant side in an evaporator and prevent failure of a cooling pipe caused due to freezing by directly detecting temperature and pressure of a refrigerant in the evaporator to raise pressures in the evaporator as well as to raise the temperature of the refrigerant or effect emergency shut down of a compressor before freezing on the chilled water side. CONSTITUTION:Temperature and pressure of a refrigerant in an evaporator 4 are detected by a temperature sensor 11 and a pressure sensor 12. When temperature and pressure in the evaporator 4 vary, they are directly detected by the refrigerant temperature sensor 11 and the pressure sensor 12, so that before a freezing condition of a chilled water set by a controller 7 is met, a solenoid valve 13 is opened to permit gas of high temperature and high pressure to be supplied to the evaporator 4 from a condenser 2, thereby raising internal temperature and pressure in the evaporator 4 for prevention of temperature drop of the chilled water. In this manner, accidents caused by freezing in a cooling pipe 10 can be prevented by directly detecting temperature and pressure of the refrigerant in flooded cooler and supplying a gas of high temperature and high pressure to the evaporator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-freezing device for an object to be cooled of a refrigerator having a full liquid type cooler.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional antifreezing device for a liquid-filled cooler. In the figure, 1 is a compressor, 2 is a condenser for liquefying high-pressure gas, 3 is an expansion valve for controlling a refrigerant gas, 4 is a liquid-filled evaporator for evaporating a refrigerant, and 5 is a starter board for starting the compressor 1. , 6 is a capacity control mechanism for controlling the capacity of the compressor 1, 7 is a controller for controlling the operation and stop of the compressor 1, 8 is a freeze prevention switch, 9 is a signal line for control, and 10 is a cold water supply pipe. Is.

Next, the operation of the above conventional device will be described. When the cooling operation is performed, the high-pressure gas compressed by the compressor 1 is liquefied by the condenser 2 and then decompressed by the expansion valve 3 to become a refrigerant that is easily evaporated. Then, cold water piping 10
Cool the more supplied water. At this time, when the temperature of the water system to be cooled falls, the freeze prevention switch 8 sends a signal to the controller 7 to turn off the operation signal of the starter board 5 and stop the compressor 1. The refrigerant that has entered the evaporator 4 evaporates and is again sucked into the compressor 1 and compressed.

[0004]

Since the refrigerator having the conventional liquid-filled type cooler is configured as described above, even if the pressure on the refrigerant side in the evaporator 4 suddenly drops, the cold water piping is provided. There was a problem that the detection of freezing of the system was delayed and the cooling pipe was damaged due to freezing. Furthermore, when a gas leak occurs while the refrigerator is stopped, water in the cold water system does not flow, and conventional temperature detection alone causes damage due to freezing of the cooling pipe when the temperature on the refrigerant side decreases due to gas leakage of the refrigerant. There was a problem.

The present invention has been made to solve the above problems, and an object thereof is to provide a device for preventing freezing damage of a cooling pipe.

[0006]

The liquid-filled type cooler freeze prevention device according to the present invention directly detects the refrigerant temperature and pressure in the evaporator to increase the evaporator pressure before freezing on the cold water side. At the same time, the temperature of the refrigerant in the evaporator is increased by increasing the temperature of the refrigerant or stopping the compressor in an emergency. In addition, before the freezing of the cold water system, the water can be drained from the cold water system.

[0007]

The temperature and pressure detection of the present invention is intended for the temperature and pressure of the refrigerant in the evaporator. Even if a sudden pressure drop occurs, it is possible to prevent the temperature drop of the refrigerant itself before freezing of the cold water. . Further, by draining water from the cold water system, frozen cold water itself can be eliminated to prevent freezing.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIG. In addition, the same or corresponding portions as those in FIG. 3 are indicated by the same numbers and reference numerals. In FIG. 1, 11 is a temperature sensor for detecting the refrigerant temperature of the evaporator 4, and 12 is the evaporator 4.
Is a pressure sensor that detects the pressure of the solenoid valve, 13 is a solenoid valve, and 14 is a check valve that prevents the backflow from the evaporator 4.

Next, the operation will be described. FIG. 1 shows a case where a cooling operation is performed, and the temperature and pressure of the refrigerant in the evaporator are detected by the temperature sensor 11 and the pressure sensor 12. Here, the temperature inside the evaporator 4,
If there is a change due to pressure, the refrigerant temperature sensor 1
1. Before the freezing condition of the cold water detected by the pressure sensor 12 and set by the controller 7 is satisfied, the electromagnetic valve 13 is opened, high temperature and high pressure gas is supplied from the condenser 2 to the evaporator 4, and the evaporation is performed. The internal temperature and pressure of the vessel 4 are raised to prevent the cold water temperature from dropping.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, 15 is a motor-operated valve installed in the cold water supply pipe 10, 16 is a solenoid valve for applying pressure to the cold water supply pipe 10, and 17 is a solenoid valve for discharging water from the cold water supply pipe 10. is there. The other components are given the same numbers as in FIG.

Next, the operation will be described. FIG. 2 shows an example in the case where the refrigerator is stopped, and shows an embodiment in which gas leakage occurs from the low pressure system of the evaporator 4 and the compressor 1. . Here, when the temperature and pressure of the refrigerant in the evaporator 4 drop due to gas leakage, the direct refrigerant temperature sensor 1
1. The electric valve 15 attached to the cold water supply pipe 10 is fully closed and the solenoid valve 16 for pressure application is opened before the cold water freezing condition set by the controller 7 detected by the pressure sensor 12 is satisfied. At the same time, the drain valve 17 is opened and the cold water in the cooling pipe of the evaporator 4 is discharged.

In the above embodiment, the object to be cooled of the liquid-filled cooler is water, but it may be a brine-related freeze prevention device. Further, in the first embodiment, the solenoid valve 13 is opened to bypass the high temperature and high pressure gas to increase the temperature and pressure of the evaporator internal pressure, but the capacity control mechanism 6 may be operated.

[0013]

As described above, according to the present invention, the temperature and pressure of the refrigerant in the full liquid type cooler are directly detected and the high temperature and high pressure gas is supplied to the evaporator. There is an effect that a freezing accident of can be prevented and a highly reliable refrigerator can be provided. In addition, since the object to be cooled itself is excluded from the system before the freezing condition is satisfied, there is no fear of freezing, and there is an effect that a refrigerator free from a cooling pipe freezing accident can be provided.

[Brief description of drawings]

FIG. 1 is a system diagram showing a full liquid type cooler freeze prevention device according to a first embodiment of the present invention.

FIG. 2 is a system diagram showing a full liquid type cooler freeze prevention device according to a second embodiment of the present invention.

FIG. 3 is a system diagram showing a conventional liquid-filled cooler antifreezing device.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Expansion valve 4 Evaporator 5 Starter panel 6 Capacity control mechanism 7 Controller 8 Freezing prevention switch 9 Signal line 10 Cold water supply pipe 11 Temperature sensor 12 Pressure sensor 13 Solenoid valve 14 Check valve 15 Motorized valve 16 Solenoid valve for pressurization 17 Solenoid valve for drainage

Claims (2)

[Claims] 1. An object to be cooled in a cooling pipe of a cooler, wherein temperature and pressure detecting means is provided in a refrigerant system of a full liquid type cooler, and temperature and pressure changes of the refrigerant system are detected by the temperature and pressure detecting means. A freezing prevention device for a liquid-filled type cooler equipped with a means for increasing the pressure on the refrigerant side in the cooler or an emergency stop mechanism before freezing. 2. A temperature and pressure detecting means is provided in the refrigerant system of the full liquid type cooler, and the temperature and pressure change of the refrigerant system is detected by the temperature and pressure detecting means to detect the temperature in the cooling pipe of the full liquid type cooler. A liquid-filled type cooler antifreezing device having a mechanism for discharging an object to be cooled in a cooling pipe before the object to be cooled is frozen.