KR20220138302A - heat pump type hotgasdefrostsystem refrigeration system - Google Patents

Abstract

During refrigeration operation, a cycle is operated to a compressor, an oil separator, four-way valves A to B, a lower inlet and an upper outlet of a condenser, a dryer, side glass, a capillary tube, an evaporator, four-way valves D to C, the liquid separator, and the compressor. During defrosting operation, the cycle is operated to the compressor, the oil separator, four-way valves A to D, a lower inlet and an upper outlet of an evaporator, the capillary tube, the side glass, the dryer, an upper inlet and a lower outlet of a condenser, four-way valves B to C, the liquid separator, and the compressor.

Description

Heat pump type hot gas defrost system refrigeration system {heat pump type hotgas defrostsystem refrigeration system}

According to the present invention, when frost is attached to the evaporator coil during operation of a refrigeration and freezing device, heat transfer failure is prevented.

Therefore, defrost must be periodically removed. This function is called Defrost.

The present invention relates to a method that is much safer than the conventional method with a heat pump-type hot gas defrosting function, and is also very excellent in electrical energy consumption efficiency.

The present invention is a hot gas defrosting method by using the electric defrost method, which is the most used conventional method.

Invented to apply

The existing electric defrost method is a defrosting method that removes the frost formed on the unit cooler coil while heating when electricity is applied by inserting a heater rod into the unit cooler body, that is, the body. This method is widely adopted because the installation work is simple and convenient.

When defrosting, a lot of moisture is generated in the unit cooler.

At this time, as the frost attached to the top of the unit cooler coil melts, moisture flows to the bottom, and when it comes into contact with the heated electric heater rod, cracks form and a short circuit occurs due to moisture penetration.

The risk of fire due to short circuit is pointed out as the biggest problem.

Long electric defrost time due to low-efficiency defrosting method, excessive use of electric energy,

The hot gas defrosting system was invented to solve the deterioration of the quality of stored products.

The present invention is a simple and most efficient hot gas defrosting system that is not complicated and easily

Invented to be applicable.

The present invention removes the frost attached to the evaporator coil by introducing the high-temperature and high-pressure discharge gas to the outlet side of the unit cooler cooling coil when defrosting the high-temperature and high-pressure refrigerant gas using a four-sided and bidirectional expansion valve or capillary tube.

In the frost attached to the surface of the evaporator coil, the high-temperature, high-pressure hot gas circulated inside the coil is directly transferred and the frost is quickly removed.

When the hot gas defrosting system of the present invention is applied, the defrosting time takes about 5 minutes, and there is a superior energy saving effect at the level of 1/4 day than the electric defrosting time of 20 minutes.

With a short defrosting time, the quality of the stored items can be maintained at the best level, and the risk of fire can also be blocked.

The essential parts of the heat pump type hot gas defrosting system of the present invention and the four standard refrigeration cycles are expressed.

The present invention is based on four cycles of refrigeration and was invented to achieve maximum efficiency with a minimum configuration, and the four sides 50 must be attached when manufacturing a refrigeration machine (outdoor unit).

The present invention will first explain the basic refrigeration cycle to help the understanding of the hot gas defrosting system.

During the refrigeration operation, the high-temperature and high-pressure discharged gas compressed in the compressor (10) is discharged by the oil separator (180).

It passes from A to B on the four sides 50.

The high-temperature, high-pressure refrigerant gas becomes the inlet at the bottom outlet of the condenser 20. The reason is that when the hot gas defrost system is operating

The condenser plays the role of the evaporator. At this time, the evaporation process must circulate from the top to the bottom so that it can be operated at a smooth evaporation pressure, and oil can be recovered even at low temperature and low pressure.

Therefore, in the refrigeration operation, the pipe circulation diagram must be worked by changing the inlet and outlet of the condenser (20).

During the refrigeration operation, the condenser 20 becomes a system in which high-temperature and high-pressure refrigerant gas circulates from bottom to top.

Since the condenser 20 is a high-temperature and high-pressure refrigerant gas, it does not affect oil retention and gas flow conditions.

The high-temperature, high-pressure refrigerant liquid condensed in the condenser 20 circulates from the bottom to the top while being in a full state.

The up-feed method creates a natural circulation structure in the full state.

Therefore, efficient operation is achieved without attaching a separate receiver.

The high-temperature and high-pressure refrigerant in the full state passes through the dryer (60) and the side glass (70).

It passes through the capillary (30).

At this time, the throttling action is achieved, and as the low-temperature and low-pressure refrigerant liquid passes through the evaporator 40 unit cooler, the state changes to low-temperature and low-pressure refrigerant gas.

It circulates from the four sides (50) D to C, and only the low-temperature and low-pressure refrigerant gas is introduced into the compressor (10) through the liquid separator (190).

This process is called compression (10), condensation (20), expansion (30), evaporation (40),

It is called the 4 refrigeration cycle.

Evaporator 40 is a device in which actual cooling is made,

At this time, frost is attached to the surface of the evaporator coil.

If defrost is not performed, the refrigeration capacity is reduced due to poor heat transfer.

There are various types of the evaporator 40, and the specific contents of the invention will be described with an example of the unit cooler used most in the low-temperature storage.

The above is the basic cycle of the refrigeration operation, and the high-temperature and high-pressure refrigerant gas discharged by operating the four sides 50 during defrost circulates from A to D and flows into the evaporator 40 unit cooler.

From now on, the hot gas defrosting system will be implemented as a reverse circulation system.

The discharged high-temperature and high-pressure refrigerant gas begins to remove the frost formed on the surface of the evaporator (40) coil.

In effect, the evaporator 40 functions as a condenser and begins to defrost.

The hot gas defrost time is set to about 5 minutes, and the compressor 10 performs the defrosting function without rest for 5 minutes.

The high-temperature and high-pressure refrigerant gas undergoes heat exchange while defrosting, and the state changes into the high-temperature and high-pressure refrigerant liquid and exits the evaporator 40. At this time, the high-temperature and high-pressure refrigerant gas circulates from the bottom to the top.

The high-temperature and high-pressure refrigerant liquid flows into the capillary tube 30, passes through the outlet and evaporates into low-temperature and low-pressure refrigerant gas, and flows to the top of the side glass 70, the dryer 60, and the condenser 20.

The condenser 20 actually functions as an evaporator, and the evaporated low-temperature and low-pressure refrigerant gas circulates from all sides 50 B to C, and only the low-temperature and low-pressure refrigerant gas flows into the compressor 10 through the liquid separator 190. .

The core of the present invention is to implement a hot gas defrosting system without complexity using four basic refrigeration cycles using a four-sided and bidirectional expansion valve or capillary tube.

10: compressor 180: oil separator
20: condenser 190: liquid separator
30: capillary tube (two-way expansion valve) 140: high, low pressure switch
40: evaporator
50: all sides
60: Dryer
70: side glass (level gauge)

Claims (3)

When defrosting by removing the frost adhering to the evaporator coil while the refrigeration system is running
This is a method and device in which the high-temperature and high-pressure discharge gas compressed from the compressor is introduced into the evaporator outlet by changing all sides, and the refrigeration system is reverse cycled to achieve hot gas defrosting.




2. The method of claim 1
When manufacturing a four-sided unit that operates during defrost, it must be attached to the outdoor unit as shown in the representative diagram.
In a general refrigeration system, a forward expansion valve is used, but in the present invention, the inlet and outlet are
An unspecified bidirectional expansion valve or capillary tube must be used.
Depending on the refrigeration capacity, it is recommended to use a capillary tube for small
For medium and large sizes, use bidirectional expansion valves.

3. The method of claim 2
When the hot gas defrosting system is applied, the necessary parts are attached and ready when the refrigeration equipment is installed.
Reduction of construction time, reduction of construction cost, reduction of electric energy,
Stability can be obtained from fire.

Images