JPH0361109B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a water-cooled refrigeration system having a defrosting mechanism.

[Prior art]

A conventional refrigeration system of this type is shown in FIG. In this Figure 1, 1 is a compressor, 2
is a water-cooled condenser, 3 is a refrigerant liquid control valve, 4 is an expansion valve,
5 is an evaporator, 6 is a refrigerant gas control valve, and 7 is a condensation pressure regulating valve.

Next, the operation will be explained. Refrigerant gas discharged from the compressor 1 is liquefied in a water-cooled condenser 2, passes through a control valve 3 and an expansion valve 4, is heated by air in an evaporator 5, is evaporated, and is cooled in a cycle that returns to the compressor 1. Drive.

In the evaporator 5, frost forms when cooling the air, so the refrigerant liquid control valve 3 is intermittently closed, the refrigerant gas control valve 6 is opened, and the high temperature discharge gas from the compressor 1 is passed through the refrigerant gas control valve 6. It is directly supplied to the evaporator 5 and defrosting operation is performed.

The defrosting heat source is the electric motor input of compressor 1 (not shown)
It is. In order to maintain the internal pressure of the water-cooled condenser 2 and keep the motor input above a certain level even when the water temperature drops in winter, the condensing pressure regulating valve 7 is used to adjust the water flow rate.
has been established.

Since the conventional refrigeration system is configured as described above, the condensing pressure is maintained above a certain level even during the cooling operation, so it has the disadvantage of requiring more electric motor input than necessary.

[Summary of the invention]

The present invention was made with the aim of improving such drawbacks, and an object of the present invention is to provide a refrigeration system in which the condensing pressure regulating valve operates only during defrosting operation, thereby reducing input during cooling operation. It is said that

[Embodiments of the invention]

Embodiments of the refrigeration system of the present invention will be described below with reference to the drawings. FIG. 2 is a system diagram of refrigerant and cooling water showing the configuration of one embodiment. This second
In the figure, a compressor 1, a refrigerant control valve 3, an expansion valve 4, an evaporator 5, and a refrigerant gas control valve 6 have the same configuration as in FIG. It is provided in parallel with the pressure regulating valve 7.

Next, the operation of the refrigeration system of the present invention configured as described above will be explained. Condensing pressure regulating valve 7
detects the internal pressure in the water-cooled condenser 2 and adjusts the amount of water to maintain a predetermined pressure, but if the water solenoid valve 8 installed in parallel is open, the predetermined pressure is not maintained and the water temperature is low. As the temperature increases, the internal pressure of the water-cooled condenser 2 becomes lower.

If the water electromagnetic valve 8 is closed, the pressure inside the water-cooled condenser 2 can be maintained above a certain level as in the conventional case. Therefore, by closing the water solenoid valve 8 only during defrosting using a controller (not shown), it is possible to secure the compressor input (input to the electric motor, etc.) necessary for defrosting even when the water temperature is low, such as in winter. , the condensing pressure can be lowered during cooling operation.

〔Effect of the invention〕

As explained above, this invention is for stopping or starting the function of a condensing pressure regulating valve that maintains the internal pressure of water-cooled condensate above a certain level during defrosting cycle operation in a refrigeration system that can be switched between a refrigeration cycle and a defrosting cycle. By installing a water solenoid valve in parallel with the condensing pressure regulating valve, during refrigeration cycle operation, the water solenoid valve is opened and the function of the condensing pressure regulating valve is stopped, lowering the condensing pressure and saving energy. However, by closing the water solenoid valve and starting the function of the condensing pressure regulating valve during the defrost cycle operation, the compressor input required for defrosting is reduced even when the water temperature is low, such as in winter. This has the effect of ensuring that defrosting can be carried out reliably, and that both refrigeration cycle operation and defrosting cycle operation can be performed optimally with an extremely simple configuration that only requires opening and closing a water solenoid valve.

[Brief explanation of drawings]

FIG. 1 is a system diagram of the refrigerant and cooling water of a conventional refrigeration system, and FIG. 2 is a system diagram of the refrigerant and cooling water of an embodiment of the refrigeration system of the present invention. 1... Compressor, 2... Water-cooled condenser, 3... Freezing liquid control valve, 4... Expansion valve, 5... Evaporator, 6...
Refrigerant gas control valve, 7... Condensing pressure regulating valve, 8...
Solenoid valve for water. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1 The refrigerant is in the compressor, water-cooled condenser, refrigerant liquid control valve,
A refrigeration cycle is piped to pass through an expansion valve and an evaporator and return to the compressor again, and the refrigerant bypasses the water-cooled condenser and sequentially passes through the compressor, the refrigerant gas control valve, and the evaporator. A refrigeration system equipped with a defrosting cycle piped to pass through and return to the compressor again, a condensing pressure regulating valve provided in the water pipe of the water-cooled condenser;
The condensing pressure regulating valve is connected in parallel with the condensing pressure regulating valve, and is opened to stop the function of the condensing pressure regulating valve during the refrigeration cycle operation, and is opened during the defrosting cycle operation.
A refrigeration system comprising a water electromagnetic valve that is controlled to be closed in order to start the function of the condensing pressure regulating valve.