JPS6038849Y2 - Cooler defrosting structure - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a defrosting structure for a cooler.

Conventional methods for defrosting a cooler include washing the frosted parts with water in the shower and defrosting them, and using an electric heater to defrost them, but the former leaves water droplets and causes further damage. Water droplets freeze during cooling, reducing the cooling effect, and the draining equipment for the shower after defrosting is expensive. This increases the internal temperature of the refrigerator, which has the disadvantage of increasing the time required for cooling, and also causes problems such as leakage and electrical leakage.

In this idea, the heating coil that conveys the high-temperature, high-pressure gas sent from the refrigeration compressor during the defrosting cycle is placed below the cooling coil of the cooler, and a drain pan is provided below the cooling coil and heating coil to heat the gas. The lower end of the fin made of a material with good vertical heat conduction through which the coil is inserted is shaped like an abbreviation, and the abutment part of the abbreviation is brought into surface contact with the inner bottom surface of the drain pan, thereby reducing the amount of heat from the heating coil. Provides a defrosting structure for a cooler that is configured to quickly thaw ice, frost, etc. from the drain pan by conducting heat to the drain pan, and can defrost quickly and without causing any increase in internal temperature. This is what I am trying to do.

The embodiment of this invention will be explained in detail based on the drawings. The drawings are explanatory diagrams of the piping structure of the defrosting structure of the cooler of the invention;
is a refrigeration compressor, which sucks in low-pressure refrigerant gas, compresses it, and sends it as high-temperature, high-pressure gas to high-temperature, high-pressure gas pipe 2, 3 is a branch point of the pipe, and 4 is branch point 3 of the same pipe.
4-1 is an inlet of the exchanger 4, and 4-2 is an outlet of the regenerative heat exchanger 4. This case houses the knife line and lithium bromide solution, and heats and stores heat using high temperature, high pressure gas passing through the vibro in the same case 5.

7 is a condenser, in which the temperature of the high-temperature, high-pressure gas is lowered by about 10 degrees Celsius in the regenerative heat exchanger 4, and the temperature of the high-temperature high-pressure gas is lowered by about 10 degrees Celsius, and then the gas is cooled from the outlet 4-2 of the exchanger 4 to the condenser 7. Gas cooling is performed using water or air to create a high-pressure liquefied refrigerant liquid.

Reference numeral 9 is a communication pipe communicating from the condenser 7 to the cooler A, 10 is a dryer strainer 111 provided in the middle of the communication pipe 9, a side glass, and 12 is a stop valve.

13 is a refrigerant liquid solenoid valve, which connects the cooler A of the communication pipe 9.
It is installed on the side and is closed during the defrost cycle.

14 is a temperature-type automatic expansion valve provided in the communication pipe 9 at the inlet of the cooler A, and the high-pressure refrigerant liquid sent from the condenser 7 through the communication pipe 9 is depressurized by the automatic expansion valve and becomes low pressure. It becomes saturated steam.

In the cooler A, cooling coils a are arranged in a meandering manner,
One end of the cooling coil a is connected to a communication pipe 9, and the above-mentioned low-pressure saturated steam passes through the cooling coil a and performs a cooling action by absorbing the heat around the outside of the cooling coil a. The other end corresponds to the discharge section for low pressure saturated steam.

a' is a cooling fin.

A heating coil b is disposed below the cooling coil a of the cooler A, and an inclined drain pan 16 is provided below the heating coil b, and vertical fins 17 through which the heating coil b is inserted. The lower part extends downward and its lower end is bent into an abbreviated shape to form an abutting part 16', and the horizontal part of the abutting part 16' makes surface contact with the inner bottom surface of the drain pan 16. This makes the heat conduction from the heating coil b efficient.

Note that the fins 17 are made of aluminum or the like to provide good thermal conductivity.

The lower end opening of the heating coil b communicates with a branch gas pipe 19 branched from the branch point 3 of the high-temperature and high-pressure gas pipe 2 via a check valve 18. By opening the provided electromagnetic valve 20, high-temperature, high-pressure gas from the refrigeration compressor 1 is sent from the branch point 3 through the branch gas pipe 19. The drain pan 16 is defrosted by heating the drain pan 16 through surface contact from the shaped abutment part 16'. It enters the cooling coil a from the coil insertion portion 22.

The evaporation pressure regulating valve 21 is connected to the heating coil b, and its function is to prevent the condensed liquefied gas remaining in the heating coil b of the drain pan 16 after switching from the defrosting cycle to the cooling cycle. Drain pan 1 under evaporative cooling action
This prevents water droplets, etc. remaining in the drain pan 16 from freezing, and maintains the evaporation pressure of the condensed liquefied gas in the heating coil b above the freezing point, prevents water droplets, etc. in the drain pan 16 from freezing, and drains water. It should be done smoothly.

The high-temperature, high-pressure gas that exits the heating coil b and enters the cooling coil a from the cooling coil insertion portion 22 is heated by condensation heat generated within the cooling coil a, causing the cooling fins 22 connected to the cooling coil a and the surface of the cooling coil 3 to The frost adhering to the refrigerant is removed, and the refrigerant becomes a high-pressure refrigerant liquid by being cooled as it passes through the cooling coil a.

B is a liquid separator, 23 is an inlet, 24 is an outlet, 25
is a refrigerant liquid bypass solenoid valve, 36 is a manual expansion valve, 2
7 is a pipe leading from the outlet 24 to the regenerative heat exchanger 4; 28 is a heating pipe connected to the pipe 27 and installed inside the regenerative heat exchanger 4; and 28 is a heating pipe connected to the trap pipe 29. There is.

Reference numeral 29 denotes a trap pipe, which is formed in a U-shape and has one end opened into the case C of the liquid separator B, and the other end inserted into the case C and communicated with the compressor communication pipe 30. The bent portion of the U-shaped trap pipe 29 is located outside the case C.

Reference numeral 31 indicates a trap fin connected to the U-shaped bent portion of the trap pipe 29, and reference numeral 32 indicates an oil return hole provided in a peripheral wall portion located in the case C at one end of the trap pipe 29.

33 is the opening at one end of the trap pipe 29 that opens into the case C, and serves as a vaporized gas inlet during the cooling cycle. During the cooling cycle, the saturated vapor discharged from the cooling coil a is separated into liquid. The gas enters the case C from the inlet 23 of the vessel B, and the gas velocity rapidly decreases and separates into gas and refrigerant liquid.The gas is sucked into the trap pipe 29 through the vaporized gas inlet 33, and is sucked through the oil return hole 32. Together with the refrigerant liquid, external heat is used to accelerate the evaporation of the refrigerant liquid in the trap pipe section outside case C, thereby separating the gas and refrigerant liquid and preventing damage to the compressor due to liquid hammer.

In addition, in the figure, 34 is a pressure regulating valve provided in the middle part of the compressor communication pipe 30, which adjusts the pressure of the refrigerant gas sucked into the refrigeration compressor 1 from the trap pipe 29 to a constant level.
This prevents damage caused by abnormal load operation of the refrigeration compressor.

The embodiment of this invention is constructed as described above. First, the cooling cycle will be explained. Low-pressure refrigerant gas is sucked into the refrigeration compressor 1, compressed to become high-temperature and high-pressure gas, and the high-temperature and high-pressure gas pipe 2, passes through the branch point 3, and reaches the regenerative heat exchanger 4 (in this case, of course, since the solenoid valve 20 of the branch gas pipe 19 is closed, the high-temperature, high-pressure gas does not flow into the branch gas pipe 19.

) In the heat exchanger 4, the high-temperature, high-pressure gas is lowered in temperature by about 10°C and reaches the condenser 7, where it is cooled and becomes a high-pressure refrigerant liquid. The pressure is reduced from the valve 13 to the temperature-type automatic expansion valve 14, and it becomes low-pressure saturated steam, which performs a cooling effect while passing through the cooling coil a.In the liquid separator B, it is separated into refrigerant gas and refrigerant liquid, and the refrigerant Gas is vaporized gas inlet 33
The compressor communication pipe 30 reaches the refrigeration compressor 1 via the trap pipe 29, and the refrigerant liquid flows through the oil return hole 32.
The air then flows into the compressor communication pipe 30 via the trap pipe 32.

On the other hand, to explain the defrosting cycle, first, the refrigerant liquid solenoid valve 13 is closed, and the solenoid valve 20 of the branch gas pipe 19 is closed.
When the refrigeration compressor 1 is opened, the high temperature and high pressure gas from the refrigeration compressor 1 is
The branch gas pipe 19 is reached from the branch point 3, and the heating coil b
flows into.

The heating coil b is heated, and the heat conducted through the fins 17 reaches the drain pan 16 and quickly defrosts the drain pan 16, and the high-temperature, high-pressure gas leaving the heating coil b is passed through the evaporation pressure regulating valve 21 into the cooling coil inserted. The cooling coil a
The heat of condensation in the cooling coil removes the frost adhering to the surface of the cooling coil 3 and the cooling fins a', and it is cooled in the cooling coil a to become a high-pressure refrigerant liquid, which is then separated from the other end 15 of the cooling coil. The high-pressure refrigerant liquid passes from the pipe 27 to the heating pipe 28 of the regenerative heat exchanger 4, is heated and vaporized, and then passes through the vaporized gas inlet 33 through the Naratsubu pipe 29.
It joins with the residual gas from the air and enters the refrigeration compressor 1 via the compressor communication pipe 30.

According to this invention, the frost that accumulates in the cooler can be defrosted quickly on the surface of the cooling coil and drain pan without increasing the temperature inside the refrigerator. The horizontal part of the drain pan is extended to form an abbreviated shape, and its horizontal part is brought into surface contact with the inner bottom surface of the drain pan, so that good heat conduction to the drain pan is achieved.
Combined with the discharge efficiency from the inclined drain pan, the defrosting efficiency is significantly improved.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of the piping of the proposed structure. 1... Refrigeration compressor, 2... High temperature and high pressure gas pipe, 3... Branch point, 4... Regenerative heat exchanger, 4-1. ...Entrance, 4-2...
...Outlet, 5...Case, 6...Pipe, 7...Condenser, End...Pipe, 9
......Communication pipe, 10...Dryer strainer-11...Side glass, 12...
... Stop valve, 13 ... Solenoid valve for refrigerant liquid, 14 ... Temperature automatic expansion valve, 15 ...
・Other end of cooling coil, 16...Drain pan, 17
...Fin, 18...Check valve, A...
...Cooler, a...Cooling coil, b...
...Heating coil, a'...Cooling fan, In, B
...Liquid separator, 19 ... Branch gas pipe, 20 ... Solenoid valve, 21 ... Evaporation pressure adjustment valve, 22 ... Cooling Coil insertion part, 23・
...Entrance, 24...Exit, 25...
...Refrigerant liquid bypass, 26...Manual expansion valve, 2
7...Pipe, 28...Heating pipe,
29... Trap pipe, 30... Compressor communication pipe, 31... Trap fin, 32...
... Oil return hole, 33 ... Vaporized gas inlet.

Claims (1)

[Scope of utility model registration request] High-temperature, high-pressure gas compressed by a refrigeration compressor is cooled by a condenser, converted to saturated steam by a thermostatic automatic expansion valve, and the surrounding heat is absorbed in the cooling coil of the cooler to perform a cooling effect. ,
A cooling system configured to separate gas and refrigerant liquid in a liquid separator, circulate the gas to a refrigeration compressor, heat the refrigerant liquid in a heat exchanger, vaporize it, and return it to the refrigeration compressor together with the separated gas. In the mechanism, a heating coil that conveys high-temperature, high-pressure gas sent from the refrigeration compressor during the defrosting cycle is placed below the cooling coil of the cooler, and an inclined drain pan is provided below the heating coil to transport the heating coil. The lower part of the inserted fin made of a material with good longitudinal heat conduction is extended downward, its lower end is bent into an abbreviated shape, and the horizontal part of the abbreviated shape is used as the abutting part. A cooling device constructed to quickly melt ice, frost, etc. from a drain pan by bringing the contact part into surface contact with the inner bottom surface of the drain pan and transmitting heat from a heating coil to the drain pan. frost structure.