Air-cooled condensing heat fluorine thawing refrigerating unit

Abstract

The utility model discloses a kind of air-water condensation heat fluorine defrosting refrigerating unit, including outer machine subsystem and inner machine subsystem and electric control system, outer machine subsystem includes air-water condensing module and compression cycle module, and inner machine subsystem includes evaporative defrosting module;Air-water condensing module is equipped with fan, water distributor, water collector and condensing coil;Compression cycle module contains four-way valve, bidirectional liquid accumulator and bidirectional filter;The evaporative defrosting module of inner machine subsystem is connected outer machine subsystem by connecting pipeline, and one-way valve is arranged on pipeline;Electric control system is configured to automatically switch air cooling mode or air-water collaborative condensing mode according to ambient temperature, and maintain condensing pressure constant by adjusting fan speed;High-temperature refrigerant is made to flow through evaporative coil in reverse direction when controlling four-way valve reversing during hot fluorine defrosting.The utility model realizes all-weather high-efficiency operation, provides fast pollution-free defrosting, can effectively solve the problem of electric heating tube burst hazard and defrosting water pollution goods, improve system reliability.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration equipment technology, specifically a wind-cooled condensing hot fluorine defrosting refrigeration unit. Background Technology

[0002] The refrigeration principle of refrigeration equipment is as follows: the compressor draws in low-pressure working fluid vapor from the evaporator, increases its pressure, and sends it to the condenser. In the condenser, it condenses into a higher-pressure liquid. After being throttled by the expansion valve, it becomes a lower-pressure liquid and is sent to the evaporator. In the evaporator, it absorbs heat and evaporates into lower-pressure vapor, which is then sent back to the compressor inlet, thus completing the refrigeration cycle. The condenser is a component of the refrigeration system and is a type of heat exchanger. It can convert gas or vapor into liquid and quickly transfer heat from the pipes to the air near the pipes. The condenser's operation is an exothermic process. The evaporator also has an exothermic function.

[0003] Currently, Chinese patent application number CN201921831075.9 discloses an air-cooled energy-saving industrial refrigeration machine, including a radiator, an evaporator, a condenser, a compressor, a throttling device, and a fan. The fan is located on one side of the radiator and the condenser, and the radiator and the condenser are located on one side of the fan's air inlet. When the fan is working, it draws air from the radiator and the condenser.

[0004] However, the air-cooled condensers of existing traditional refrigeration units suffer from severe energy efficiency degradation due to insufficient heat dissipation during high-temperature seasons, while water-cooled condensers are prone to system failure due to icing in low-temperature environments. At the same time, existing defrosting technologies such as electric defrosting are time-consuming and have dead zones, while water defrosting may contaminate goods and damage equipment, affecting the reliability and energy efficiency of refrigeration equipment. Utility Model Content

[0005] The purpose of this utility model is to provide a refrigeration unit with air-cooled condensing and hot-fluorine defrosting to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a condensing and defrosting refrigeration unit, comprising an outdoor unit subsystem, an indoor unit subsystem, and an electrical control system. The outdoor unit subsystem includes a condensing module and a compression cycle module, and the indoor unit subsystem includes an evaporation defrosting module. The condensation module includes an outer shell, an air inlet on the side of the outer shell, a fan on the top of the outer shell, a condensation coil, a water distributor and a water collector located above the condensation coil, and a water pump and a water tank connected to the water distributor. The compression cycle module includes a compressor, a four-way valve, an oil separator, a gas-liquid separator, a two-way liquid receiver, a two-way filter, a high-pressure sensor, a low-pressure sensor, and a throttling device; The evaporation defrosting module includes an evaporation coil, a flow distribution device, and a chassis heating element; The outdoor unit subsystem is connected to the evaporator coil inlet of the indoor unit subsystem through a first pipe and a second pipe, respectively. A first shut-off valve is installed in the first pipe and a second shut-off valve is installed in the second pipe. The electronic control system is configured to perform the following controls: A. During cooling, control the refrigerant to circulate in the forward direction from the condenser coil of the outdoor unit subsystem to the evaporator coil of the indoor unit subsystem; B. Select the condensation mode according to the ambient temperature command: Pure air-cooled mode: Only the fan is activated to cool the air; Wind and water coordinated mode: The fan and water pump are started simultaneously to distribute water evenly to the condenser coil by the water distributor, and the fan drives the airflow to evaporate the water and absorb heat. C. Maintain constant condensing pressure by adjusting the fan speed; D. During hot refrigerant defrosting, the four-way valve is switched to allow the high-temperature refrigerant to flow in reverse through the first pipeline into the evaporator coil of the indoor unit subsystem to release heat and defrost. After defrosting, the refrigerant returns to the outdoor unit subsystem through the second shut-off valve in the second pipeline via the throttling device.

[0007] Preferably, the specific control logic of the Feng Shui collaborative mode is as follows: When the ambient temperature is ≥ the set value, the water pump is started, and the speed of the fan is adjusted according to the high pressure. When the ambient temperature is less than or equal to the set value, the water pump is stopped, and the fan is operated at an adjusted speed according to the high pressure.

[0008] Preferably, the water collector has a corrugated plate structure and is installed between the condenser coil and the fan, with its bottom connected to the surface of the condenser coil.

[0009] Preferably, a sight glass is provided between the bidirectional filter and the second shut-off valve.

[0010] In addition, this utility model also provides a hot refrigerant defrosting method based on the above-mentioned air-cooled condensing hot refrigerant defrosting refrigeration unit, including: S1. When defrosting starts, the electronic control system switches the four-way valve so that the compressor discharge end enters the evaporator coil to release heat and defrost after passing through the first pipeline. S2. After defrosting, the liquid refrigerant passes through the second shut-off valve and then through the throttling device. It then passes through the two-way filter and the two-way liquid receiver in sequence before re-entering the condenser coil to absorb heat and evaporate. After passing through the four-way valve to the gas-liquid separator, it returns to the compressor suction end.

[0011] Preferably, after defrosting is complete, the heating element of the chassis continues to work to prevent water droplets from freezing, and the heating element stops working after the water dripping stops.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves adaptive air-water condensation control based on ambient temperature: dynamic switching between air-cooled and air-water hybrid modes; it solves the industry problem of the sharp drop in condensation efficiency of traditional air-cooled units at high temperatures in summer and the insufficient condensation pressure of water-cooled units at low temperatures in winter, ensuring that the unit always maintains optimal energy efficiency under extreme climatic conditions and significantly reducing system energy consumption.

[0013] 2. This utility model utilizes a four-way valve to reverse the flow of high-temperature refrigerant through the evaporator coil, replacing the high-risk electric defrosting and water defrosting methods. It achieves defrosting without dead zones within 5 minutes, eliminates the risk of electric heating tube rupture and the problem of defrosting water contaminating goods, and significantly improves the hygiene, safety and operational continuity of cold storage.

[0014] 3. This utility model adopts a staggered design of stainless steel condenser coils, which reduces the overall size of the unit and reduces scaling on the condenser coils. Combined with the pressure stabilization mechanism of the bidirectional liquid receiver, it effectively slows down the frosting speed of the coils, solves the problem of reduced heating capacity caused by frost blockage in traditional units at low temperatures, and expands the geographical applicability of the unit.

[0015] 4. This utility model features an automatic bypass throttling device for the one-way valve during defrosting to avoid high-pressure impact, a corrugated plate water collector to achieve water droplet recycling, a bidirectional filter to ensure the filtration of impurities in both forward and reverse flow, and multiple protection designs to reduce the failure rate of key components and maintenance costs, thereby extending the equipment's lifespan. Attached Figure Description

[0016] Figure 1 This is a process diagram of the refrigeration unit of this utility model.

[0017] In the diagram: Fan-3, Condensate Coil-4, Water Collector-5, Water Distributor-6, Water Pump-7, Water Tank-8, Compressor-9, Four-Way Valve-10, Oil Separator-11, Gas-Liquid Separator-12, Two-Way Liquid Receiver-13, Two-Way Filter-14, High Pressure Sensor-15, Low Pressure Sensor-16, Evaporator Coil-17, Throttling Device-18, First Shut-Off Valve-19, Second Shut-Off Valve-20, Sight Glass-21, First Pipeline-L1, Second Pipeline-L2. Detailed Implementation

[0018] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0019] Please see Figure 1 This utility model provides a condensing and defrosting refrigeration unit, including an outdoor unit subsystem, an indoor unit subsystem, and an electrical control system. The outdoor unit subsystem includes a condensing module and a compression cycle module, and the indoor unit subsystem includes an evaporation defrosting module. The condensing module includes a housing, an air inlet on the side of the housing, a fan 3 on the top of the housing, a condensing coil 4, a water distributor 6 and a water collector 5 located above the condensing coil, a water pump 7 connected to the water distributor, and a water tank 8. The water collector 5 has a corrugated plate structure and is installed between the condensing coil 4 and the fan 3. Its bottom is connected to the surface of the condensing coil 4. The water distributor 6 achieves uniform spraying, and the water collector 5 uses inertial collision to efficiently capture water droplets and reduce water droplet escape. The condensing coil 4 is made of stainless steel tubes and has a staggered design, which reduces the overall size of the unit and reduces scale buildup on the condensing coil. The compression cycle module includes a compressor 9, a four-way valve 10, an oil separator 11, a gas-liquid separator 12, a two-way liquid receiver 13, a two-way filter 14, a high-pressure sensor 15, a low-pressure sensor 16, and a throttling device 18. The four-way valve 10 is used to switch the refrigerant / defrost flow direction, and the oil separator 11 prevents refrigerant oil from entering the condenser and affecting heat exchange. The gas-liquid separator 12 protects the compressor from liquid slugging. The two-way liquid receiver 13 stabilizes the refrigerant flow rate when flowing in both directions. A sight glass 21 is provided between the two-way filter 14 and the second shut-off valve 20 to visually observe the refrigerant status, which is convenient for maintenance. The evaporation defrosting module includes an evaporation coil 17, which serves as a heat exchange carrier in the cold storage, a blower, a distribution device, and a chassis heating element. The evaporation coil 17 is the core component for refrigerant heat absorption and evaporation. The cooling effect is achieved by reducing the pressure and throttling the refrigerant through the throttling device 18 in the outdoor unit subsystem. The distribution device ensures that the refrigerant is evenly distributed to each evaporation branch. The outdoor unit subsystem is connected to the inlet of the evaporator coil 17 of the indoor unit subsystem through the first pipe L1 and the second pipe L2 to realize the transfer of refrigerant. The first pipe L1 is equipped with a first shut-off valve 19 and the second pipe L2 is equipped with a second shut-off valve 20. The electronic control system is configured to perform the following controls: A. During cooling, control the refrigerant to circulate in the forward direction from the condenser coil 4 of the outdoor unit subsystem to the evaporator coil 17 of the indoor unit subsystem to start the basic cooling cycle; B. Select the condensation mode according to the ambient temperature command: Pure air-cooled mode: Only fan 3 is activated for air cooling, enabling energy-saving operation in low-temperature environments; Wind and water coordination mode: The fan 3 and water pump 7 are started simultaneously, so that the water distributor 6 distributes water evenly to the condenser coil 4. The fan 3 drives the airflow to evaporate the water and absorb heat. In high-temperature environments, the latent heat of water evaporation is used to improve energy efficiency. C. Maintain constant condensing pressure by adjusting the speed of fan 3 to ensure that the system always operates at the optimal energy efficiency point; D. During hot refrigerant defrosting, the four-way valve 10 is switched to allow the high-temperature refrigerant to flow in reverse through the first pipeline L1 into the evaporator coil 17 of the indoor unit subsystem to release heat and defrost. After defrosting, the refrigerant returns to the outdoor unit subsystem through the second shut-off valve 20 in the second pipeline L2 and the bypass throttling device 18, replacing electric defrosting and eliminating the risk of fire.

[0020] The specific control logic of the Feng Shui synergy mode is as follows: When the ambient temperature is greater than or equal to the set value, the water pump 7 is started, and the speed of the moving fan 3 is adjusted according to the high pressure. When the ambient temperature is less than or equal to the set value, stop the water pump 7 and adjust the speed of the fan 3 according to the high pressure.

[0021] In addition, this utility model also provides a hot refrigerant defrosting method based on the above-mentioned air-cooled condensing hot refrigerant defrosting refrigeration unit, including: S1. When defrosting starts, the electronic control system switches the four-way valve 10 so that the exhaust end of the compressor 9 enters the evaporator coil 17 through the first pipeline L1 to release heat and defrost. S2. After defrosting, the liquid refrigerant passes through the second shut-off valve 20 and then through the throttling device 18. It then passes through the bidirectional filter 14 and the bidirectional liquid receiver 13 in sequence before re-entering the condenser coil 4 to absorb heat and evaporate. After passing through the four-way valve 10 to the gas-liquid separator 12, it returns to the suction end of the compressor 9.

[0022] After defrosting is complete, the heating element on the chassis continues to work to prevent water droplets from freezing. Once the water has stopped dripping, the heating element stops working.

[0023] The working process of this utility model of a condensing hot-frozen defrosting refrigeration unit is as follows: (a) Refrigeration cycle: 1. Compressor 9 draws in low-temperature refrigerant vapor, which, after compression, passes through oil separator 11 → four-way valve 10 → and enters condenser coil 4. 2. Condensation mode selection: When the ambient temperature is ≥20 degrees, start the water pump 7 and adjust the speed of the fan 3 according to the high pressure. When the ambient temperature is ≤20 degrees, stop the water pump 7 and adjust the speed of the fan 3 according to the high pressure. 3. The condensed high-pressure liquid passes through the two-way liquid receiver 13 → two-way filter 14 → throttling device 18 → second shut-off valve 20 → evaporator coil 17. After evaporating by absorbing heat in the evaporator coil 17, it passes through the four-way valve 10 → gas-liquid separator 12 → compressor 9 to complete the refrigeration cycle.

[0024] (ii) Thermal defrosting cycle: 1. The electrical control system switches the four-way valve 10 for reversing; 2. After the compressor 9 discharges through the four-way valve 10, the high-temperature gas passes through the first pipeline L1 and the first shut-off valve 19 in the pipeline and then enters the evaporator coil 17 to release heat, so that the evaporator coil 17 can defrost at high temperature. 3. After defrosting, the refrigerant absorbs cold and liquefies. The liquid refrigerant passes through the second shut-off valve 20 and then through the throttling device 18. It then passes through the two-way filter 14 and the two-way liquid receiver 13 in sequence before re-entering the condenser coil 4 to absorb heat and evaporate. After passing through the four-way valve 10 to the gas-liquid separator 12, it returns to the suction end of the compressor 9, completing the hot refrigerant defrosting process.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A condensing, hot-frozen defrosting refrigeration unit, comprising an outdoor unit subsystem, an indoor unit subsystem, and an electrical control system, characterized in that: The outdoor unit subsystem includes a cooling and condensation module and a compression circulation module, while the indoor unit subsystem includes an evaporation and defrosting module. The condensation module includes an outer shell, an air inlet located on the side of the outer shell, a fan (3) located on the top side of the outer shell, a condensation coil (4), a water distributor (6) and a water collector (5) located above the condensation coil, a water pump (7) connected to the water distributor, and a water tank (8). The compression cycle module includes a compressor (9), a four-way valve (10), an oil separator (11), a gas-liquid separator (12), a two-way liquid receiver (13), a two-way filter (14), a high-pressure sensor (15), a low-pressure sensor (16), and a throttling device (18). The evaporation defrosting module includes an evaporation coil (17), a flow distribution device, and a chassis heating element; The outdoor unit subsystem is connected to the inlet of the evaporator coil (17) of the indoor unit subsystem through the first pipe (L1) and the second pipe (L2). The first pipe (L1) is equipped with a first shut-off valve (19), and the second pipe (L2) is equipped with a second shut-off valve (20).

2. The refrigeration unit for air-cooled condensing and hot defrosting according to claim 1, characterized in that: The water collector (5) is a corrugated plate structure, installed between the condenser coil (4) and the fan (3), with its bottom connected to the surface of the condenser coil (4).

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