Hot fluorine defrosting system of cold storage
By using the waste heat of the refrigeration system to melt the frost layer through the hot fluorine defrosting system, the problems of high energy consumption and fire hazards in traditional cold storage defrosting are solved. This achieves energy-saving, safe and stable defrosting effect, improving the refrigeration efficiency of cold storage and the quality of goods.
Patent Information
- Application Number
- CN202511131436.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-13
- Publication Date
- 2025-10-31
AI Technical Summary
Traditional cold storage defrosting methods are energy-intensive, prone to fire, and affect the stability of the internal temperature, thus reducing refrigeration efficiency.
The hot refrigerant defrosting system utilizes the waste heat of the refrigeration system itself to melt the frost layer through high-temperature superheated refrigerant vapor, and recovers the refrigerant and lubricating oil, achieving a defrosting process that requires no additional heating energy.
It saves 15%-20% of energy, reduces overall power consumption by 29.4%, controls temperature fluctuations within 3℃, improves heat exchange efficiency, ensures stable temperature inside the warehouse, avoids fire hazards, and enhances the performance of the refrigeration system.
Smart Images
Figure CN120868692A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of cold storage technology, and in particular to a hot fluorine defrosting system for cold storage. Background Technology
[0002] A cold storage facility is a type of refrigeration equipment. It refers to an environment created artificially to differ in temperature and humidity from the outside environment, used for the constant temperature and humidity storage of items such as food, liquids, chemicals, pharmaceuticals, vaccines, and scientific experiments.
[0003] The compressor is a crucial component in cold storage. Originally, the compressor heats the inside of the cold storage and cools the outside. When air passes through the evaporator, because the surface temperature of the evaporator is lower than the dew point temperature of the air, the water vapor in the air will condense into water droplets, which will further freeze to form frost. If frost and ice are not dealt with for a long time, they will reduce the refrigeration efficiency, increase energy consumption and electricity consumption, and the compressor unit will be easily damaged, affecting the quality of goods in the cold storage.
[0004] Traditional electric defrosting devices use heating wires that can reach temperatures of several hundred degrees Celsius, which can easily cause fires. In addition, they have high defrosting power and high overall power consumption. Summary of the Invention
[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a hot-fluorine defrosting system for cold storage. Its advantages include: defrosting using waste heat from the system, while simultaneously recovering and reusing the defrosting medium, eliminating the need for additional heating energy, and thus being highly efficient and energy-saving.
[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: a hot fluorine defrosting system for cold storage, including a cooler, a compressor, a two-way liquid receiver, a finned condenser, and a four-way valve for pipeline connection. The exhaust end of the compressor is connected to a gas-liquid separator through a pipeline. The exhaust end of the gas-liquid separator is connected to the first port of the four-way valve through a pipeline. The evaporator of the cooler is provided with a gas collecting pipe, and one end of the gas collecting pipe is connected to the second port of the four-way valve.
[0007] Preferably, it also includes a waste liquid collection system, which includes a drain head installed on the evaporator of the air cooler, an inlet pipe installed on the bidirectional liquid reservoir, and a connecting pipe between the drain head and the inlet pipe.
[0008] Preferably, an exhaust pipe is provided at the top of one end of the compressor, and one end of the exhaust pipe is connected to the third port of a three-way valve via a connecting pipe.
[0009] Preferably, the gas collecting pipe of the finned condenser is connected to the fourth port of the four-way valve through the connecting pipe four, the top of the bidirectional liquid reservoir is provided with a second liquid inlet pipe, and the liquid distributor of the finned condenser is connected to the second liquid inlet pipe through the connecting pipe five.
[0010] Preferably, the top of the bidirectional liquid reservoir is provided with a connecting pipe, and the discharge pipe of the compressor is connected to the connecting pipe through a connecting pipe.
[0011] Preferably, an exhaust temperature sensor is installed at the end of the connecting pipe three near the compressor, and a pressure sensor is installed at the end of the connecting pipe three near the four-way valve.
[0012] Preferably, a return gas temperature sensor is installed at the end of the pipeline near the gas-liquid separator, and a pressure sensor is installed at the end of the pipeline near the four-way valve.
[0013] Preferably, the connecting pipeline five is sequentially equipped with a bidirectional drying filter, an electronic expansion valve, and a temperature sensor from the liquid separator to the second inlet pipe.
[0014] Preferably, the second connecting pipe is equipped with a third temperature sensor, a second electronic expansion valve, and a second temperature sensor in sequence from the drain head to the first inlet pipe.
[0015] Compared with the prior art, the beneficial effects of this application are as follows:
[0016] (1) Energy saving and high efficiency: Compared with electric heating defrosting, hot fluorinated defrosting utilizes the waste heat of the refrigeration system itself, which can save 15%-20% of electricity. Moreover, the defrosting power is low, and the overall power consumption can be reduced by 29.4%.
[0017] (2) Safe and reliable: The temperature of the electric heating wire of traditional electric defrosting can reach hundreds of degrees Celsius, which can easily cause fire. However, the temperature of hot fluorinated defrosting is adjusted according to the condensation temperature, which is generally in the tens of degrees, far below the ignition point, thus eliminating the fire hazard.
[0018] (3) Stable storage temperature: The hot defrosting technology keeps the temperature fluctuation inside the storage room within 3℃, which is much lower than the 10℃ or more of the traditional electric defrosting, which helps to ensure the quality of stored goods.
[0019] (4) Improve heat exchange efficiency: The defrosting process can remove the accumulated refrigeration oil inside the pipe wall, which helps to improve the heat exchange efficiency of the air cooler or pipe, and improve the performance of the entire refrigeration system.
[0020] (5) During the defrosting process, the original refrigerant liquid, melted frost water and possible accumulated refrigeration oil in the evaporator are collected into the two-way liquid receiver (such as the defrost collection tank) under the action of pressure difference or gravity, and then flow back into the system circulation to realize the recycling and reuse of refrigerant and lubricating oil. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the system of the present invention.
[0022] In the diagram: 101, Pressure sensor 1; 102, Pressure sensor 2; 201, Exhaust temperature sensor; 202, Return gas temperature sensor; 3, Gas-liquid separator; 4, Two-way dryer filter; 501, Electronic expansion valve 1; 502, Electronic expansion valve 2; 601, Temperature sensor 1; 602, Temperature sensor 2; 603, Temperature sensor 3. Detailed Implementation
[0023] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0024] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.
[0025] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0026] One preferred embodiment of this application, such as Figure 1 As shown, a hot-fluid defrosting system for a cold storage includes: a cold air blower, a compressor, a two-way liquid receiver, a finned condenser, and a four-way valve for pipeline connection. The exhaust end of the compressor is connected to a gas-liquid separator 3 via a pipeline. The exhaust end of the gas-liquid separator 3 is connected to the first port of the four-way valve via a pipeline. A gas collecting pipe is provided on the evaporator of the cold air blower, and one end of the gas collecting pipe is connected to the second port of the four-way valve.
[0027] The high-temperature superheated refrigerant vapor discharged from the compressor is separated into oil and directed into the evaporator, temporarily transforming it into a condenser. The condensation of the refrigerant releases a large amount of heat, which is used to melt the frost layer on the evaporator surface. Compared to electric defrosting, hot refrigerant defrosting utilizes the waste heat of the refrigeration system itself, saving 15%-20% of electricity. Furthermore, it has lower defrosting power, resulting in a 29.4% reduction in overall power consumption.
[0028] Traditional electric defrosting uses heating wires that can reach temperatures of several hundred degrees Celsius, which can easily cause fires. In contrast, hot fluorinated defrosting adjusts the temperature based on the condensation temperature, which is generally in the tens of degrees Celsius, far below the ignition point, thus eliminating the risk of fire. Hot fluorinated defrosting technology keeps the temperature fluctuation inside the warehouse within 3 degrees Celsius, which is much lower than the 10 degrees Celsius or more of traditional electric defrosting, thus helping to ensure the quality of stored goods.
[0029] In this application, the high-temperature superheated refrigerant vapor discharged by the compressor is typically 70-100°C. This vapor is originally waste heat to be condensed in the refrigeration cycle. By switching valves, the high-temperature refrigerant vapor is introduced into the frosted evaporator of the air cooler. At this time, the evaporator temporarily acts as a "condenser". The refrigerant condenses in the evaporator, releasing a large amount of latent heat, which directly heats the frost layer on the evaporator tube wall and surface, causing the frost layer to melt quickly.
[0030] Further reference Figure 1 As shown, it also includes a waste liquid collection system, which includes a drain head installed on the evaporator of the air cooler, an inlet pipe I installed on the bidirectional liquid receiver, and a connecting pipe II between the drain head and the inlet pipe I. During the defrosting process, it can remove the accumulated refrigerant oil inside the pipe wall, which helps to improve the heat exchange efficiency of the air cooler or pipes and improve the performance of the entire refrigeration system. During the defrosting process, the original refrigerant liquid, melted frost water, and any accumulated refrigerant oil in the evaporator are collected in the bidirectional liquid receiver, such as a defrost collection tank, under the action of pressure difference or gravity, and then flow back into the system circulation to realize the recycling and reuse of refrigerant and lubricating oil.
[0031] Further reference Figure 1 As shown, an exhaust pipe is also provided at the top of one end of the compressor, and one end of the exhaust pipe is connected to the third port of the four-way valve through connecting pipe three; the gas collecting pipe of the finned condenser is connected to the fourth port of the four-way valve through connecting pipe four; a second liquid inlet pipe is provided at the top of the bidirectional liquid receiver, and the liquid distributor of the finned condenser is connected to the second liquid inlet pipe through connecting pipe five; a connecting pipe is provided at the top of the bidirectional liquid receiver, and the discharge pipe of the compressor is connected to the connecting pipe through connecting pipe six; an exhaust temperature sensor 201 is installed at the end of connecting pipe three near the compressor, and the connecting pipe... A pressure sensor 101 is installed at the end of pipe 3 near the four-way valve; a return gas temperature sensor 202 is installed at the end of pipe 1 near the gas-liquid separator 3, and a pressure sensor 2 102 is installed at the end of pipe 1 near the four-way valve; a bidirectional drying filter 4, an electronic expansion valve 1 501, and a temperature sensor 1 601 are installed sequentially in connecting pipe 5 from the liquid separator head to the second liquid inlet pipe; a temperature sensor 3 603, an electronic expansion valve 2 502, and a temperature sensor 2 602 are installed sequentially in connecting pipe 2 from the liquid drain head to the liquid inlet pipe 1.
[0032] Working Principle: The high-temperature superheated refrigerant vapor discharged from the compressor is separated by oil and directed into the evaporator, temporarily transforming it into a condenser. The condensation of the refrigerant releases a large amount of heat, which melts the frost layer on the evaporator surface. Simultaneously, the refrigerant and lubricating oil accumulated in the evaporator are drawn to a defrost collection tank or low-pressure circulation tank for recycling under the pressure of the refrigerant or gravity. This system is generally simple to operate, requiring no additional power supply, reducing installation complexity and maintenance costs. Some systems are easy to operate after a one-time installation, requiring no frequent manual intervention. It is suitable for single-compressor circulation systems below 60hp, small and medium-sized cold storage facilities below 800 square meters, ice-making equipment, and can also be used for energy-saving retrofitting of cold storage refrigeration units.
[0033] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.
Claims
1. A hot-fluorine defrosting system for cold storage, characterized in that, include: The package includes a evaporator, a compressor, a two-way liquid receiver, a finned condenser, and a four-way valve for pipeline connection. The exhaust end of the compressor is connected to a gas-liquid separator (3) via a pipeline. The exhaust end of the gas-liquid separator (3) is connected to the first port of the four-way valve via a pipeline. The evaporator of the evaporator is equipped with a gas collecting pipe, and one end of the gas collecting pipe is connected to the second port of the four-way valve.
2. The hot-fluorine defrosting system for cold storage as described in claim 1, characterized in that, It also includes a waste liquid collection system, which includes a drain head installed on the evaporator of the air cooler, an inlet pipe installed on the bidirectional liquid reservoir, and a connecting pipe between the drain head and the inlet pipe.
3. The hot-fluorine defrosting system for cold storage as described in claim 1, characterized in that, The compressor is also provided with an exhaust pipe at one end of its top, and one end of the exhaust pipe is connected to the third port of the three-way and four-way valve through a connecting pipe.
4. The hot-fluorine defrosting system for cold storage as described in claim 1, characterized in that, The gas collecting pipe of the finned condenser is connected to the fourth port of the four-way valve through the connecting pipe four. The top of the bidirectional liquid reservoir is provided with a second liquid inlet pipe. The liquid distributor of the finned condenser is connected to the second liquid inlet pipe through the connecting pipe five.
5. The hot-fluorine defrosting system for cold storage as described in claim 1, characterized in that, The top of the bidirectional liquid receiver is provided with a connecting pipe, and the discharge pipe of the compressor is connected to the connecting pipe through a connecting pipe six.
6. The hot-fluorine defrosting system for cold storage as described in claim 3, characterized in that, An exhaust temperature sensor (201) is installed at the end of the connecting pipe three near the compressor, and a pressure sensor (101) is installed at the end of the connecting pipe three near the four-way valve.
7. A hot-fluorine defrosting system for cold storage as described in claim 1, characterized in that, A return gas temperature sensor (202) is installed at one end of the pipeline near the gas-liquid separator (3), and a pressure sensor (102) is installed at the other end of the pipeline near the four-way valve.
8. A hot-fluorine defrosting system for cold storage as described in claim 4, characterized in that, The connecting pipeline 5 is sequentially equipped with a bidirectional drying filter (4), an electronic expansion valve (501), and a temperature sensor (601) from the liquid separator to the second inlet pipe.
9. A hot-fluorine defrosting system for cold storage as described in claim 2, characterized in that, Temperature sensor 3 (603), electronic expansion valve 2 (502), and temperature sensor 2 (602) are sequentially installed in the second connecting pipe from the drain head to the first inlet pipe.