JPS60221663A - Refrigeration equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a refrigeration system, and more particularly, to a refrigeration system suitable for use in a hot gas/spider bus defrosting system.

[Background of the invention]

In a conventional refrigeration system with hot gas bypass removal 'AHA 3Af self', when the removal A'd command is issued, il'l:
At present, a method was used in which the discharge side of the compressor and the evaporator were connected to each other by bypass piping, and the discharged gas from the compressor was bypassed to the evaporator to defrost the air. This vertical method immediately switches to hot gas/whittle bath defrosting when a defrosting command is issued, so it can be used when the compressor is not stable at temperature, such as when the compressor is in operation, or especially outdoors.

When installed, when the discharge rate is low and the compressor deviation is low, such as during winter, the deviation of the discharged gas bypassed to the evaporator will be 1 degree, and the deterioration of the old generation will be poor. There was a drawback.

[Purpose of the invention]

It is an object of the present invention to provide a refrigeration system capable of performing stable hot gas bypass defrosting regardless of operating time or external temperature.

[Outline of invention cost]

In order to achieve the above object, the present invention uses a four-way valve as a valve to switch the refrigeration cycle from cooling operation to hot gas bypass desilting operation, and when removing the hot gas bypass wave, the discharge side of the compressor and the condenser are separated, and the The present invention is characterized in that it performs a bypass operation in which the discharge side of the compressor and the outlet path of the evaporator are connected to heat the compressor to reach a predetermined temperature, and then performs hot gas bypass defrosting.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1
is a compressor, whose discharge side is connected to a four-way valve 2, and the discharge side path is switched to a condenser 8 as shown by a solid line during cooling operation, and to a check valve 8 as shown by a broken line during defrosting operation. Condenser 8
The outlet side path of the expansion valve 4 is connected to the expansion valve 4, the outlet path of the expansion valve 4 is connected to the evaporator 5, and the outlet side path of the evaporator 55 is connected to the suction side of the compression type 1 via the accumulator 6. The check valve 8 allows flow only in the direction of the broken line arrow, and the outflow side is provided with a path VC connecting the 1-carved valve 4 and the evaporator 5. In addition, a thin tube 7 and a 4L valve 10 are connected to the outlet of the evaporator 5, and the thin tube and I4i,
The magnetic valve is connected to the other passage of the four-way valve 2, and its connection path is switched to the reversal valve 8 side as shown by the solid line during cooling operation, and to the condenser 8 during defrosting operation. The solid line arrow indicates the cooling operation, the broken line arrow indicates the defrosting operation, and the dashed line indicates the refrigerant flow direction at the initial stage of switching to the defrosting operation.

During cooling operation, as shown by the solid line arrow, the discharged refrigerant gas compressed by the compressor 1 flows into the condenser 3 via the four-way valve 2, where it is cooled and liquefied, and then passes through the 1# expansion valve 4. The refrigerant is circulated, is depressurized, becomes a low-pressure refrigerant, and flows into the evaporator 5. At this time, a very small portion of the low-pressure refrigerant flows through the capillary 9, passes through the four-way valve 2, and flows into the accumulator 6 via the thin tube 7. Most of the low-pressure refrigerant absorbs heat from the fluid to be cooled in the evaporator 5, and the vaporized refrigerant gas is sucked into the compressor 1 through the accumulator 6. As the cooling operation progresses, frost forms on the evaporator 5. arise.

As frosting progresses, the cooling performance decreases, so the operation is switched to defrosting mode as appropriate. In the fj operation, the four-way valve 2 is switched as shown by the broken line, and at the same time the solenoid valve 10 is opened. At the same time, the refrigerant flows in the direction of the dashed line arrow, and at the same time, most of it flows in the direction of the dashed-dotted line arrow, and the high-temperature, high-pressure discharge gas compressed by the compressor 1 passes through the four-way valve 2, the electromagnetic valve 10, the accumulator 6, and returns to the compressor. 1 and heats and stores heat throughout the compressor. When the discharge gas temperature of the compressor reaches a predetermined temperature, solenoid valve 1
0 is closed and the refrigerant flows only in the direction of the dashed arrow.

The high-temperature, high-pressure discharge gas compressed by the compressor 1 passes through the four-way valve 2 and the check valve 8, and the entire amount directly flows into the evaporator 5, heating the evaporator 5, so that the frost adhering to the surface is melted. The refrigerant gas is cooled, a portion of which is liquefied, and is sucked into the compressor 1 again through the accumulator 6, forming a hot gas bypass defrosting cycle. At this time, the evaporator 5 performs a condensing action, so the evaporator 5 uses more refrigerant than during cooling operation, but the population side of the condenser 3 and the outlet side of the evaporator 5 Since the refrigerant gas in the condenser 3 is gradually replenished into the defrosting cycle through the capillary tube 7 (11-), optimal hot gas bypass defrosting is performed.

The condensing action is performed in the Maso generator 5, and a part of the liquid refrigerant is liquefied and sucked into the compressor 1 through the accumulator 6.
The stored heat is heated and gasified by the compressor, resulting in stable defrosting.

〔Effect of the invention〕

This has been explained above. According to the present invention, during hot gas bypass deloading, the high-width, high-pressure discharge gas that has been compressed by the compressor is directly connected to the outlet path of the evaporator, and the compressor is heated and stored, and then the hot gas is Since bypass defrosting is performed, a stable weight removal action is performed regardless of the operating time or external temperature.

[Brief explanation of the drawing]

FIG. 1 is a cycle configuration diagram of a refrigeration system showing one embodiment of the present invention. 1... Compressor 2... Four-way valve 3... Condenser 4
... Squeezing device 5 ... Evaporator 7 ... Thin tube 8.
...Check valve 9...Capillary tube 10...
Solenoid valve grass 1 river

Claims (1)

[Claims] 1. The discharge side path of the compressor is turned off by a single force of the four-way valve 11X! It lies in the flow path and is switchably connected to the evaporator artificial side path via a condenser or flow path side device, and connects the condenser, diaphragm, evaporator, and compressor suction side in sequence. Connect the flow path 1till to the other end of the evaporator +1111 path of the evaporator, connect the outlet path VCal pipe of the evaporator, and connect the other end to the other switching flow path of the four-way valve. Connect the solenoid valve to the outlet path of the evaporator, connect the other end to the other switching flow path of the four-way valve, and when the hot gas bypass is removed at 11g,
Open the above solenoid valve, connect the compressor discharge side path and the evaporator outlet path through the ox valve, and then close the solenoid valve and 4. 2. The refrigeration system (σ) according to claim 1, in which the hill road suppressor is a check valve. Claim 1jH Clause 1: A self-mounted refrigeration system comprising capillary capillaries connected in parallel.