Cold and hot integrated automatic hot fluorine defrosting type unit

Abstract

The invention belongs to the technical field of refrigeration equipment, and particularly relates to a cold and hot integrated automatic hot fluorine defrosting type unit which comprises a compressor, a first electric four-way valve, a condenser, a liquid storage tank, an expansion valve, an air cooler, a first electric three-way valve and a gas-liquid separator. The compressor, the condenser, the liquid storage tank, the filter, the expansion valve, the air cooler and the gas-liquid separator are sequentially connected in series to form a refrigerating unit, the first electric four-way valve is connected to a pipeline between the compressor and the condenser, and the electric three-way valve is connected to a pipeline between the air cooler and the gas-liquid separator. Condensing pressure can be maintained, and energy consumption of defrosting is prevented from being increased.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration equipment, and in particular relates to an integrated cooling and heating automatic hot fluorine defrosting unit. Background Art

[0002] Frosting is a common phenomenon in various low-temperature and refrigeration systems. When the surface temperature of the air cooler is below 0°C, condensed water will form when the air flows through the cooler surface, causing frost on the cooler surface. The frost layer will not only increase the heat transfer resistance, but also increase the air flow resistance of the forced circulation evaporator (such as the air cooler), thereby affecting the heat exchange efficiency. Therefore, no matter what cooling method the cold storage adopts, measures must be taken regularly to remove the frost layer. In addition, during the high temperatures in summer, the heat dissipation of the condenser is affected by the high temperature environment and cannot completely liquefy the refrigerant discharged from the compressor, resulting in excessive high temperature pressure, causing the high-pressure protection of the equipment to trip, making the equipment unable to operate normally.

[0003] Common defrosting methods include manual defrosting, electric heater defrosting, water defrosting, and hot fluorine defrosting. Manual defrosting is simple to operate and does not affect the temperature of the cold storage. However, the defrosting process is labor-intensive and the defrosting is incomplete. Electric heater defrosting consumes a lot of power, and the temperature of the cold storage fluctuates widely, which is not conducive to preserving the freshness of food in the cold storage. Water defrosting is suitable for cold storage with fan coil evaporators, but the water system used for water defrosting is complex. Therefore, at this stage, hot fluorine defrosting refrigeration systems are often used. This refrigeration system sends the high-temperature gas discharged from the compressor into the evaporator, which condenses the high-temperature gas and uses the heat released by the high-temperature gas during the condensation process to melt the frost layer on the surface of the evaporator, thereby defrosting the frost.

[0004] However, during the hot fluorine defrosting process, the unit often fails to maintain the condensing pressure, resulting in a significant increase in the defrosting time, which in turn increases the energy consumption of defrosting. In addition, there is a large pressure drop in the gas-liquid separator during the hot fluorine defrosting process. The high-pressure gas directly entering the gas-liquid separator and compressor may cause vibration and leakage.

[0005] Therefore, how to provide an integrated hot and cold automatic hot fluorine defrosting unit that can maintain the condensing pressure has become a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] In response to the problems existing in the above-mentioned prior art, the present invention discloses an integrated hot and cold automatic hot fluorine defrosting unit, and specifically discloses the following technical solutions: A cold and hot integrated automatic hot fluorine defrosting unit, comprising a compressor, a first electric four-way valve, a condenser, a liquid storage tank, an expansion valve, an air cooler, a first electric three-way valve and a gas-liquid separator. The compressor, condenser, liquid storage tank, filter, expansion valve, air cooler and gas-liquid separator are connected in series in sequence to form a refrigeration unit. The first electric four-way valve is connected to the pipeline between the compressor and the condenser, and the electric three-way valve is connected to the pipeline between the air cooler and the gas-liquid separator. The first interface of the first electric four-way valve is connected to the exhaust port of the compressor, the second interface is connected to the condenser, the third interface is connected to the second interface of the electric three-way valve, and the fourth interface is connected to the inlet of the gas-liquid separator; the first interface of the electric three-way valve is connected to the exhaust port of the air cooler, the third interface is connected to the air inlet of the gas-liquid separator, and one-way valves are connected in parallel on both sides of the expansion valve pipeline.

[0007] Furthermore, it also includes a filter and a first solenoid valve, which are arranged on the pipeline between the liquid storage tank and the expansion valve, and one-way valves are connected in parallel on both sides of the filter and the first solenoid valve.

[0008] Furthermore, it also includes a pressure regulating valve, which is arranged at the outlet of the gas-liquid separator.

[0009] Furthermore, it also includes a stop valve, which is arranged on the pipeline between the liquid storage tank and the expansion valve.

[0010] Furthermore, a second solenoid valve is provided on the pipeline between the condenser and the first electric four-way valve.

[0011] Furthermore, it also includes an oil separator, which is arranged on the pipeline between the compressor and the first electric four-way valve.

[0012] Furthermore, it also includes a second electric four-way valve, the first interface of the second electric four-way valve is connected to the liquid storage tank, the second interface is connected to the outlet of the condenser, and the third interface and the fourth interface are both connected to the inlet of the gas-liquid separator.

[0013] Furthermore, it also includes a gas mixer, which is arranged between the second electric four-way valve and the gas-liquid separator. The third interface and the fourth interface of the second electric four-way valve are both connected to the inlet of the gas mixer, and the outlet of the gas mixer is connected to the gas-liquid separator.

[0014] Furthermore, it also includes a controller, which is arranged on the surface of the unit, and the electric three-way valve, the first electric four-way valve, and the second electric four-way valve are all electrically connected to the controller.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: through the setting of the electric three-way valve and the first electric four-way valve, the present invention can recharge the compressor with the liquid refrigerant after defrosting after vaporization, thereby maintaining the condensation pressure and reducing the power consumption of defrosting. The setting of the gas mixer and the pressure regulating valve can avoid a large pressure drop in the gas-liquid separator during the hot fluorine defrosting process. The direct entry of high-pressure gas into the gas-liquid separator and the compressor may cause vibration and leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the cooling state of Example 1 of the present invention; Figure 2 This is a schematic diagram of the defrosting state of Example 1 of the present invention; Figure 3 This is a schematic diagram of the defrosting state in Example 2 of the present invention.

[0017] Among them, 1-compressor, 2-first electric four-way valve, 3-condenser, 4-liquid storage tank; 5-filter; 6-first solenoid valve; 7-expansion valve; 8-air cooler; 9-electric three-way valve; 10-gas-liquid separator; 11-oil separator; 12-one-way valve; 13-second solenoid valve; 14-stop valve; 15-pressure regulating valve; 16-temperature and humidity sensor; 17-controller; 18-second electric four-way valve; 19-gas mixer. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Example 1

[0020] Reference Figure 1-2 This embodiment discloses an integrated hot and cold automatic hot fluorine defrosting unit, including a compressor 1, a first electric four-way valve 2, a condenser 3, a liquid storage tank 4, a filter 5, a first solenoid valve 6, an expansion valve 7, an air cooler 8, an electric three-way valve 9 and a gas-liquid separator 10.

[0021] The compressor 1, the condenser 3, the liquid storage tank 4, the filter 5, the first solenoid valve 6, the expansion valve 7, the air cooler 8 and the gas-liquid separator 10 are connected in series in sequence to form a refrigeration unit. The first electric four-way valve 2 is connected to the pipeline between the compressor 1 and the condenser 3, and the electric three-way valve 9 is connected to the pipeline between the air cooler 8 and the gas-liquid separator 10.

[0022] Specifically, such as Figure 1 As shown, the first interface A of the first electric four-way valve 2 is connected to the exhaust port of the compressor 1 through a pipeline, and an oil separator 11 is also connected in series on the pipeline. The second interface B of the first electric four-way valve 2 is connected to the condenser 3, the third interface C of the first electric four-way valve 2 is connected to the second interface F of the electric three-way valve 9, and the fourth interface D of the first electric four-way valve 2 is connected to the inlet of the gas-liquid separator 10; the first interface E of the electric three-way valve 9 is connected to the exhaust port of the air cooler 8, and the third interface G of the electric three-way valve 9 is connected to the air inlet of the gas-liquid separator 10. A one-way valve 12 is connected in parallel on both sides of the series pipeline of the filter 5, the expansion valve 7, and the first solenoid valve 6.

[0023] As a preferred embodiment of the present invention, a second solenoid valve 13 is provided on the pipeline between the second interface B of the first electric four-way valve 2 and the condenser 3 for adjusting the exhaust flow rate, and a stop valve 14 is provided on the pipeline between the liquid storage tank 4 and the expansion valve 7.

[0024] As a preferred embodiment of the present invention, it also includes a pressure regulating valve 15, which is arranged at the outlet of the gas-liquid separator 10. The setting of the pressure regulating valve 15 improves the stability of the airflow entering the compressor 1, increases the suction pressure, and stably increases the exhaust volume of the compressor 1.

[0025] As a preferred embodiment of the present invention, a temperature and humidity sensor 16 is further provided on the surface of the tube sheet of the air cooler 8 for detecting the frost condition of the air cooler 8 .

[0026] The present invention further includes a controller 17 , which is disposed on the surface of the unit. The electric three-way valve 9 , the first electric four-way valve 2 , and the temperature and humidity sensor 16 are all electrically connected to the controller 17 .

[0027] In this embodiment, when the unit is in the cooling state, the first electric four-way valve 2 and the electric three-way valve 9 are not energized. At this time, the first interface A of the first electric four-way valve 2 is connected to the second interface B, the first interface E of the electric three-way valve 9 is connected to the second interface F, and the other interfaces are closed. The exhaust gas of the compressor 1 enters the condenser 3 through the oil separator 11 and the first electric four-way valve 2. The condensed liquid refrigerant enters the liquid storage tank 4, passes through the filter 5 and the first solenoid valve 6, enters the expansion valve 7, is intercepted by the expansion valve 7 and sent to the air cooler 8 for evaporation. The evaporated gaseous refrigerant enters the gas-liquid separator 10 through the electric three-way valve 9, and enters the compressor intake air through the gas-liquid separator 10; Figure 2As shown, when the temperature and humidity sensor 16 detects that the pipe segments of the air cooler 8 need to be defrosted with hot fluorine, the first electric four-way valve 2 and the electric three-way valve 9 are opened, so that the first interface A of the first electric four-way valve 2 is connected to the third interface C, the second interface B is connected to the fourth interface D, the second interface F of the electric three-way valve 9 is connected to the first interface E, and the third interface G is closed. The exhaust gas of the compressor 1 enters the air cooler 8 through the oil separator 11, the first electric four-way valve 2, and the electric three-way valve 9. At this time, all the pipes in the air cooler 8 are The sheets will be defrosted by hot fluorine exhaust. The hot fluorine refrigerant will become liquid when circulating in the tube sheets of the air cooler 8. At this time, the liquid refrigerant will enter the liquid storage tank 4 through the one-way valve 12 bypassing the expansion valve 7. After buffering in the liquid storage tank 4, most of the gaseous refrigerant and a small amount of liquid refrigerant will enter the condenser 3 for evaporation. The evaporated gaseous refrigerant is sent to the gas-liquid separator 10 through the first electric four-way valve 2, and then sent to the compressor 1 for secondary air replenishment. At this time, the exhaust of the compressor 1 is increased, and the defrosting efficiency is improved, which is suitable for efficient and fast defrosting.

[0028] Example 2

[0029] like Figure 3 As shown, the difference between this embodiment and Example 1 is that this embodiment further includes a second electric four-way valve 18 and a gas mixer 19, the second electric four-way valve 18 is electrically connected to the controller 17, the first interface H of the second electric four-way valve 18 is connected to the liquid storage tank 4, the second interface I is connected to the outlet of the condenser 3, the third interface J and the fourth interface K are both connected to the inlet of the gas mixer 19, and the outlet of the gas mixer 19 is connected to the inlet of the gas-liquid separator 10.

[0030] When the unit is in the refrigeration state, the second electric four-way valve 18 is not energized. At this time, the first interface H is connected to the second interface I. When defrosting is required, the first electric four-way valve 2 and the electric three-way valve 9 are opened to connect the first interface A of the first electric four-way valve 2 with the second interface B and the third interface C, and the fourth interface D is closed. The second interface F of the electric three-way valve 9 is connected to the first interface E, and the third interface G is closed. The first interface H of the second electric four-way valve 18 is connected to the third interface J, and the second interface I is connected to the fourth interface K.

[0031] The exhaust gas in the compressor 1 has two circulation directions. The first circulation direction is similar to that of Example 1. The difference is that after passing through the liquid storage tank 4, the exhaust gas enters the gas mixer 19 through the first interface H and the third interface J of the second electric four-way valve 18. The second circulation direction is that the exhaust gas passes through the second solenoid valve 13, the condenser 3, the second interface I and the fourth interface K of the second electric four-way valve 18 and enters the gas mixer 19. At this time, the refrigerant in the second circulation direction and the refrigerant in the first circulation direction are merged in the gas mixer 19 and mixed. The refrigerant in the second circulation direction can adjust the refrigerant in the first circulation direction to a low temperature and low pressure state, and then return to the compressor 1 through the gas-liquid separator 10 and the pressure regulating valve 15, which can ensure the stable operation of the unit, and the temperature fluctuation during defrosting is small, which improves the stability of the warehouse temperature and is suitable for stable defrosting.

[0032] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A hot and cold integrated automatic hot fluorine defrosting unit, characterized in that: The refrigeration unit includes a compressor, a first electric four-way valve, a condenser, a liquid storage tank, an expansion valve, an air cooler, a first electric three-way valve and a gas-liquid separator. The compressor, condenser, liquid storage tank, filter, expansion valve, air cooler and gas-liquid separator are connected in series in sequence to form a refrigeration unit. The first electric four-way valve is connected to the pipeline between the compressor and the condenser, and the electric three-way valve is connected to the pipeline between the air cooler and the gas-liquid separator. The first interface of the first electric four-way valve is connected to the exhaust port of the compressor, the second interface is connected to the condenser, the third interface is connected to the second interface of the electric three-way valve, and the fourth interface is connected to the inlet of the gas-liquid separator; the first interface of the electric three-way valve is connected to the exhaust port of the air cooler, the third interface is connected to the air inlet of the gas-liquid separator, and one-way valves are connected in parallel on both sides of the expansion valve pipeline.

2. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: It also includes a filter and a first solenoid valve, which are arranged on the pipeline between the liquid storage tank and the expansion valve, and one-way valves are connected in parallel on both sides of the filter and the first solenoid valve.

3. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: The invention also comprises a pressure regulating valve, which is arranged at the outlet of the gas-liquid separator.

4. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: It also includes a stop valve, which is arranged on the pipeline between the liquid storage tank and the expansion valve.

5. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: A second solenoid valve is provided on the pipeline between the condenser and the first electric four-way valve.

6. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: It also includes an oil separator, which is arranged on the pipeline between the compressor and the first electric four-way valve.

7. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 1, characterized in that: It also includes a second electric four-way valve, the first interface of which is connected to the liquid storage tank, the second interface is connected to the outlet of the condenser, and the third interface and the fourth interface are both connected to the inlet of the gas-liquid separator.

8. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 7, characterized in that: It also includes a gas mixer, which is arranged between the second electric four-way valve and the gas-liquid separator. The third interface and the fourth interface of the second electric four-way valve are both connected to the inlet of the gas mixer, and the outlet of the gas mixer is connected to the gas-liquid separator.

9. The integrated hot and cold automatic hot fluorine defrosting unit according to claim 7, characterized in that: It also includes a controller, which is arranged on the surface of the unit. The electric three-way valve, the first electric four-way valve, and the second electric four-way valve are all electrically connected to the controller.

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