CN111380327A - Quick freezing machine with hot gas defrosting function - Google Patents
Quick freezing machine with hot gas defrosting function Download PDFInfo
- Publication number
- CN111380327A CN111380327A CN201811622719.3A CN201811622719A CN111380327A CN 111380327 A CN111380327 A CN 111380327A CN 201811622719 A CN201811622719 A CN 201811622719A CN 111380327 A CN111380327 A CN 111380327A
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- Prior art keywords
- refrigerant
- pressure
- liquid
- electromagnetic valve
- defrosting
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D31/00—Other cooling or freezing apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
Abstract
The invention designs a quick freezer with hot gas defrosting function, wherein an intercooling electromagnetic valve, a refrigeration electromagnetic valve and a defrosting electromagnetic valve are arranged in the quick freezer, the intercooling electromagnetic valve controls the on-off of the refrigerant circulation in a supercooling pipeline, the refrigeration electromagnetic valve controls the on-off of the refrigerant circulation in a liquid supply pipeline, and the defrosting electromagnetic valve controls the on-off of the refrigerant circulation in a defrosting pipeline. In the instant freezer, a condenser condenses a gaseous refrigerant into a liquid state through air exchange, a liquid storage device stores the refrigerant, and an expansion valve throttles and reduces the pressure of the high-pressure liquid refrigerant to change the high-pressure liquid refrigerant into a low-pressure gas and liquid mixture. The upper evaporator makes the refrigerant exchange heat with air to continuously lower the temperature of the air around the evaporator, and the lower evaporator makes the refrigerant exchange heat with the air to continuously lower the temperature of the air around the evaporator. By the design of the invention, the liquid impact fault of the compressor of the refrigerating system can be avoided when the instant freezer is defrosted.
Description
Technical Field
The invention belongs to the technical field of plasma freezing, and particularly relates to a quick freezing machine with a hot gas defrosting function.
Background
The installation pipelines of the split instant freezers are different in length, the instant freezers can be directly converted into a frost mode after refrigeration, because refrigerants in the upper evaporator and the lower evaporator are not completely evaporated, if high-pressure hot gas of a defrosting electromagnetic valve directly enters the upper evaporator and the lower evaporator during defrosting, liquid which is not evaporated in the evaporators passes through the gas-liquid separator and the air suction pressure regulating valve directly enters the compressor for air suction, the refrigerants in the compressor have no evaporation space, the liquid refrigerants directly suck low-pressure stage air suction valve plates of the two-stage compressor, and because the compressor can only compress gas, the liquid enters the air suction cavity to deform or crack the air suction valve plates of the compressor.
Disclosure of Invention
The invention aims to solve the technical problem of providing a quick freezer with a hot gas defrosting function, and avoiding the occurrence of liquid impact fault of a compressor of a refrigerating system when the quick freezer is defrosted.
The technical scheme adopted by the invention for solving the technical problems is as follows: the instant freezer is provided with an intercooling electromagnetic valve, a refrigeration electromagnetic valve and a defrosting electromagnetic valve, wherein the intercooling electromagnetic valve controls the on-off of the refrigerant circulation in the supercooling pipeline, the refrigeration electromagnetic valve controls the on-off of the refrigerant circulation in the liquid supply pipeline, and the defrosting electromagnetic valve controls the on-off of the refrigerant circulation in the defrosting pipeline.
According to the technical scheme, the device further comprises a low-pressure sensor and a medium-pressure sensor, wherein the low-pressure sensor is used for measuring the pressure in the suction pipe, and the medium-pressure sensor is used for measuring the pressure of a medium-pressure part of the compressor.
According to the technical scheme, the quick freezer comprises a two-stage compressor low-pressure stage, a two-stage compressor high-pressure stage, a condenser, a liquid storage device, an expansion valve, an upper evaporator, a lower evaporator, a gas-liquid separator and a suction pressure regulating valve, wherein the two-stage compressor low-pressure stage compresses a system low-pressure gaseous refrigerant into a medium-pressure gaseous refrigerant and provides power for the refrigerant to circulate in a refrigeration system. The high-pressure stage of the two-stage compressor compresses a medium-pressure gaseous refrigerant in the system into a high-pressure gaseous refrigerant to provide power for the circulation of the refrigerant in the refrigeration system, the condenser condenses the gaseous refrigerant into liquid state through air exchange, the liquid storage device stores the refrigerant, and the expansion valve throttles and reduces the pressure of the high-pressure liquid refrigerant to change the high-pressure liquid refrigerant into a low-pressure gas and liquid mixture; the upper evaporator makes the refrigerant exchange heat with air to constantly reduce the ambient air temperature of the evaporator, the upper evaporator is of a fixed structure, the lower evaporator makes the refrigerant exchange heat with air to constantly reduce the ambient air temperature of the evaporator, and the lower evaporator is of a movable structure. The gas-liquid separator separates the gaseous refrigerant and the liquid refrigerant in the line, and the suction pressure regulating valve regulates the pressure of the refrigerant in the suction line.
According to the technical scheme, the device also comprises a liquid supply drying filter for drying the refrigerant in the liquid supply pipeline.
According to the technical scheme, the refrigeration system further comprises a supercooling drying filter for drying the refrigerant in the supercooling pipeline.
According to the technical scheme, the system also comprises an intercooler used for reducing the temperature of the refrigerant of the liquid supply pipeline. The refrigeration efficiency is improved.
According to the technical scheme, the device also comprises a liquid supply net-shaped filter for filtering impurities in the liquid supply pipeline.
According to the technical scheme, the evaporator further comprises a liquid supply flexible connecting pipe and an air suction flexible connecting pipe, and the lower evaporator is connected through the liquid supply flexible connecting pipe and the air suction flexible connecting pipe. The liquid supply flexible connecting pipe enables the liquid supply pipeline to move along with the movement of the lower evaporator. The flexible air suction connecting pipe enables the air suction pipeline to move along with the movement of the lower evaporator.
According to the technical scheme, the defrosting device further comprises a defrosting mesh filter for filtering impurities in the defrosting pipeline.
The principle of the invention is that in a refrigeration mode, a compressor compresses refrigerant gas to a condenser to be condensed into liquid to enter a liquid storage device, high-pressure refrigerant is divided into two paths through a drying filter, one path of refrigerant is evaporated by the drying filter, an electromagnetic valve and an expansion valve to exchange heat with the other path of intercooler refrigerant liquid, the high-pressure liquid refrigerant is cooled, the cooled liquid refrigerant passes through a mesh filter, a refrigeration electromagnetic valve and a refrigeration expansion valve to reach an upper evaporator and a lower evaporator to be evaporated, if incomplete evaporation liquid refrigerant passes through a gas-liquid separator and a suction pressure regulating valve to return to a low-pressure stage of a two-stage compressor, a low-pressure sensor monitors evaporation pressure, and a medium-pressure sensor protects. In the defrosting mode, the compressor returns the refrigerant which is not completely evaporated by the upper evaporator and the lower evaporator (during refrigeration) to the low-pressure stage of the two-stage compressor through the gas-liquid separator and the air suction pressure regulating valve, the refrigerant pressure of the upper evaporator and the lower evaporator is judged through the low-pressure sensor, the coil pressure of the compressor is protected through the medium-pressure sensor which judges the medium pressure, the defrosting electromagnetic valve is controlled for multiple times to ensure that the defrosting electromagnetic valve is normally opened after the refrigerant passes through the fluorine collecting control process which is controlled by a program for multiple times, the high-pressure gas of the compressor enters the evaporator, the high-pressure gas of the compressor returns to the compressor through the gas-liquid separator and the air suction pressure regulating valve (ensuring that the upper evaporator, the lower evaporator and the compressor suck air to generate high-low pressure difference and maintain the air suction pressure of the compressor), the heat is exchanged with the upper evaporator and the lower evaporator through the high-, And after the lower evaporator reaches the set defrosting termination temperature, stopping the defrosting control process.
The invention has the following beneficial effects: the liquid impact fault of the compressor of the refrigerating system is avoided when the instant freezer is defrosted.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of a quick freezer with hot gas defrosting function according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the embodiment of the invention, a quick freezer with a hot gas defrosting function is provided, as shown in fig. 1, an intercooling electromagnetic valve 7, a refrigerating electromagnetic valve 11 and a defrosting electromagnetic valve 19 are arranged in the quick freezer, the intercooling electromagnetic valve controls the on-off of the refrigerant circulation in a supercooling pipeline, the refrigerating electromagnetic valve controls the on-off of the refrigerant circulation in a liquid supply pipeline, and the defrosting electromagnetic valve controls the on-off of the refrigerant circulation in a defrosting pipeline. It also comprises a low pressure sensor 20 for measuring the pressure in the suction pipe, and an intermediate pressure sensor 21 for measuring the pressure in the intermediate pressure part of the compressor.
The quick freezer comprises a two-stage compressor low-pressure stage 1, a two-stage compressor high-pressure stage 2, a condenser 3, a liquid storage device 4, an expansion valve 8, an upper evaporator 14, a lower evaporator 15, a gas-liquid separator 16 and a suction pressure regulating valve 17, wherein the two-stage compressor low-pressure stage compresses a system low-pressure gaseous refrigerant into a medium-pressure gaseous refrigerant to provide power for the refrigerant to circulate in a refrigeration system. The high-pressure stage of the two-stage compressor compresses a medium-pressure gaseous refrigerant in the system into a high-pressure gaseous refrigerant to provide power for the circulation of the refrigerant in the refrigeration system, the condenser condenses the gaseous refrigerant into liquid state through air exchange, the liquid storage device stores the refrigerant, and the expansion valve throttles and reduces the pressure of the high-pressure liquid refrigerant to change the high-pressure liquid refrigerant into a low-pressure gas and liquid mixture; the upper evaporator makes the refrigerant exchange heat with air to constantly reduce the ambient air temperature of the evaporator, the upper evaporator is of a fixed structure, the lower evaporator makes the refrigerant exchange heat with air to constantly reduce the ambient air temperature of the evaporator, and the lower evaporator is of a movable structure. The gas-liquid separator separates the gaseous refrigerant and the liquid refrigerant in the line, and the suction pressure regulating valve regulates the pressure of the refrigerant in the suction line. And a liquid supply drying filter 5 for drying the refrigerant in the liquid supply pipeline. The supercooling dry filter 6 is also included for drying the refrigerant in the supercooling pipeline. And the intercooler 9 is used for reducing the temperature of the refrigerant of the liquid supply pipeline and improving the refrigeration efficiency. A liquid supply mesh filter 10 is also provided to filter impurities in the liquid supply line. The lower evaporator is connected by a liquid supply flexible connecting pipe 12 and an air suction flexible connecting pipe 13. The liquid supply flexible connecting pipe enables the liquid supply pipeline to move along with the movement of the lower evaporator. The flexible air suction connecting pipe enables the air suction pipeline to move along with the movement of the lower evaporator. Also comprises a defrosting mesh filter 18 for filtering impurities in the defrosting pipeline.
When defrosting is carried out, the compressor is started, the refrigeration electromagnetic valve, the intercooling electromagnetic valve and the defrosting electromagnetic valve are not electrified, the compressor sucks the upper evaporator, the lower evaporator, the gas-liquid separator, the suction pressure regulating valve and the internal refrigerant, then exhausts the sucked refrigerant to the condenser for condensation, so that the refrigerant enters the condenser and the liquid storage device, the compressor medium pressure sensor monitors that the compressor medium pressure is lower than 0.2bar, and the defrosting electromagnetic valve is electrically opened. When a compressor medium pressure sensor monitors that the compressor medium pressure rises to 1bar, the defrosting electromagnetic valve is closed. When the pressure sensor monitors that the pressure in the evaporator is 0.2bar again, the defrosting electromagnetic valve is opened. When the compressor medium pressure sensor monitors that the pressure in the compressor medium pressure rises to 1bar again, the defrosting electromagnetic valve is closed (according to the condition that the length of the pipeline is not fixed, the circulation monitoring times are set, the closer distance of the pipeline is less, and the longer distance of the pipeline is more, the setting times are increased). After the liquid refrigerant in the upper evaporator and the lower evaporator is completely gasified through a plurality of cycles, the defrosting electromagnetic valve 19 completely opens the upper evaporator and the lower evaporator to reach the set temperature, and then the defrosting function is stopped.
The working process of the instant freezer is as follows, and the refrigeration mode is as follows: the compressor is started, the refrigeration electromagnetic valve 11 and the middle cooling electromagnetic valve 7 are opened, and the defrosting electromagnetic valve 19 is closed. The gaseous refrigerant is compressed by a low pressure stage 1 of the two-stage compressor to form medium pressure, and is compressed by a high pressure stage 2 of the two-stage compressor to form high pressure gas, the high pressure gas is condensed into liquid by a condenser 3 and enters a liquid storage device 4, the high pressure liquid refrigerant passes through a liquid supply drying filter 5 and then is divided into two paths, one path of refrigerant flows to a supercooling drying filter 6 and then flows to an intercooling electromagnetic valve 7, and the refrigerant flows to the rear of the high pressure stage of the two-stage compressor for secondary compression circulation after throttling, pressure. The refrigerant liquid of the other path of the intercooler 9 exchanges heat through the refrigerant from the expansion valve 8 to reduce the temperature of the refrigerant in the pipeline, flows to the liquid supply mesh filter 10, flows to the refrigeration electromagnetic valve 11, flows to the upper evaporator 14 for evaporation, heat absorption and temperature reduction after throttling, pressure reduction and evaporation through the expansion valve 8, flows to the liquid supply flexible soft connecting pipe 12, enters the lower evaporator 15 for evaporation, heat absorption and temperature reduction after flowing out of the lower evaporator 15 to the air suction flexible connecting pipe 13, flows to the gas-liquid separator 16 together with the refrigerant flowing out of the upper evaporator 14, if the liquid refrigerant which is not completely evaporated flows through the gas-liquid separator 16, is accumulated at the bottom, the separated gas refrigeration flows to the air suction pressure regulating valve 17, returns to the low pressure stage 1 of the two-stage compressor for compression, then flows to the high pressure stage 2 of the two-stage compressor, and continuously circulates in such a way, The temperature around the lower evaporator 15 is lowered to achieve the effect of freezing the blood product. A low pressure sensor 20 monitors the low pressure suction pressure and a medium pressure sensor 21 monitors the medium pressure.
Defrosting mode: the compressor is started, the refrigeration electromagnetic valve 11 and the middle and cold electromagnetic valve 7 are closed, the defrosting electromagnetic valve 19 is closed, the gaseous refrigerant is compressed by the low pressure stage 1 of the two-stage compressor to form a medium pressure, and is compressed by the high pressure stage 2 of the two-stage compressor to form a high pressure gas, the high pressure gas is condensed into liquid by the condenser 3 to enter the liquid storage device 4, the defrosting electromagnetic valve 9 is closed due to the closing of the refrigeration electromagnetic valve 11 and the middle and cold electromagnetic valve 7, the suction pressure is reduced, when the set value of the medium pressure sensor 21 is reached, the defrosting electromagnetic valve 9 is opened, the high temperature refrigerant flows to the defrosting electromagnetic valve 19 through the defrosting mesh filter 18, one path of the refrigerant flows to the upper evaporator 14, the other path of the refrigerant flows to the liquid supply flexible connecting pipe 12, the refrigerant enters the lower evaporator 15, the refrigerant flows to the gas suction flexible connecting pipe 13 and then flows to, after the separated gaseous refrigeration flows to the air suction pressure regulating valve 17, the separated gaseous refrigeration returns to the low pressure stage 1 of the double-stage compressor for compression, then flows to the high pressure stage 2 of the double-stage compressor, the high temperature refrigerant flows to the defrosting mesh filter 18 again, the circulation is continued, when the pressure detected by the middle pressure sensor 21 is increased to a certain value, the defrosting electromagnetic valve 19 is closed again, the air suction pressure is reduced, the incompletely evaporated liquid refrigerant in the pipeline is reduced, after repeated control processes, the defrosting electromagnetic valve 19 is normally opened, the high temperature refrigerant enables the temperature around the upper evaporator 14 and the lower evaporator 15 to be increased, the defrosting effect is achieved, and after the upper evaporator 14 and the lower evaporator 15 reach the set defrosting termination temperature, the defrosting control process is stopped.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (9)
1. A quick freezer with hot gas defrosting function is characterized in that an intercooling electromagnetic valve, a refrigeration electromagnetic valve and a defrosting electromagnetic valve are arranged in the quick freezer, the intercooling electromagnetic valve controls the on-off of refrigerant circulation in a supercooling pipeline, the refrigeration electromagnetic valve controls the on-off of the refrigerant circulation in a liquid supply pipeline, and the defrosting electromagnetic valve controls the on-off of the refrigerant circulation in a defrosting pipeline.
2. The freezer with hot gas defrosting function as claimed in claim 1, further comprising a low pressure sensor for measuring the pressure in the suction pipe, and an intermediate pressure sensor for measuring the pressure in the intermediate pressure part of the compressor.
3. The quick freezer with the hot gas defrosting function as claimed in claim 1 or 2, characterized in that the quick freezer comprises a two-stage compressor low-pressure stage, a two-stage compressor high-pressure stage, a condenser, a liquid storage device, an expansion valve, an upper evaporator, a lower evaporator, a gas-liquid separator and a suction pressure regulating valve, wherein the two-stage compressor low-pressure stage compresses system low-pressure gaseous refrigerant into medium-pressure gaseous refrigerant, the two-stage compressor high-pressure stage compresses the system medium-pressure gaseous refrigerant into high-pressure gaseous refrigerant, the condenser condenses the gaseous refrigerant into liquid through air exchange, the liquid storage device stores the refrigerant, and the expansion valve throttles and reduces the pressure of the high-pressure liquid refrigerant to form a low-pressure gas-liquid mixture; the upper evaporator makes the refrigerant exchange heat with air, the lower evaporator makes the refrigerant exchange heat with air, the gas-liquid separator separates the gaseous refrigerant and the liquid refrigerant in the pipeline, and the suction pressure regulating valve regulates the pressure of the refrigerant in the suction pipeline.
4. The instant freezer with hot gas defrosting function as claimed in claim 1 or 2, further comprising a liquid supply drying filter for drying the refrigerant in the liquid supply line.
5. The instant freezer with hot gas defrosting function as claimed in claim 1 or 2, further comprising a supercooling dry filter for drying the refrigerant in the supercooling line.
6. A freezer with hot gas defrosting capability as claimed in claim 1 or claim 2 further comprising an intercooler for reducing the temperature of the refrigerant in the liquid supply line.
7. The instant freezer with hot gas defrosting function as claimed in claim 1 or 2, further comprising a liquid supply net filter for filtering impurities in the liquid supply pipeline.
8. The instant freezer with hot gas defrosting function as claimed in claim 1 or 2, further comprising a liquid supply flexible connecting pipe and a suction flexible connecting pipe, wherein the lower evaporator is connected by the liquid supply flexible connecting pipe and the suction flexible connecting pipe.
9. The instant freezer with hot gas defrosting function as claimed in claim 1 or 2, further comprising a defrosting mesh filter for filtering impurities in the defrosting pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811622719.3A CN111380327A (en) | 2018-12-28 | 2018-12-28 | Quick freezing machine with hot gas defrosting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811622719.3A CN111380327A (en) | 2018-12-28 | 2018-12-28 | Quick freezing machine with hot gas defrosting function |
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| Publication Number | Publication Date |
|---|---|
| CN111380327A true CN111380327A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811622719.3A Pending CN111380327A (en) | 2018-12-28 | 2018-12-28 | Quick freezing machine with hot gas defrosting function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033080A (en) * | 2020-08-31 | 2020-12-04 | 山东冰河制冷技术有限公司 | Refrigeration house refrigeration system and refrigeration control method |
-
2018
- 2018-12-28 CN CN201811622719.3A patent/CN111380327A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112033080A (en) * | 2020-08-31 | 2020-12-04 | 山东冰河制冷技术有限公司 | Refrigeration house refrigeration system and refrigeration control method |
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