A finned tube heat exchanger's pneumatic defrosting device

Abstract

The application discloses a kind of finned tube heat exchanger's pneumatic defrosting device, device is by electric control box, air compressor, dry filter, gas storage tank, safety valve, pressure gauge, exhaust valve, solenoid valve, pipe, jet pipe group, guide rail, adjusting knob and auxiliary heating device constitute, defrosting is carried out to finned tube heat exchanger.By electric control box control air compressor generates gas source, after filtering drier and gas storage tank pressure storage, by solenoid valve control on-off, by pipe delivery to jet pipe group, utilize guide rail to realize the positioning and movement of jet pipe group, cooperate adjusting knob and auxiliary heating device to heat exchanger is carried out collaborative defrosting.The application is in the prior art, defrosting efficiency is low, and the problem that equipment is easily damaged and energy consumption is high, by pneumatic injection combined with auxiliary heating mode, avoid the resource waste of traditional defrosting, realize the efficient, uniform defrosting of finned tube heat exchanger, with defrosting efficiency is high, environmental protection and energy saving, nimble and simple and so on.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger defrosting technology, specifically to a pneumatic defrosting device for finned tube heat exchangers. Background Technology

[0002] In the refrigeration and air conditioning industry, frost formation on heat exchangers is unavoidable. Frost formation severely impacts equipment operating efficiency and leads to significant energy consumption during defrosting, making it a common and harmful phenomenon in refrigeration, air conditioning, and other low-temperature applications. Jet defrosting, a surface treatment method, offers advantages such as high efficiency, low cost, environmental friendliness, and practicality. In particular, jet defrosting demonstrates excellent performance in preventing and improving frost formation during the initial stages of frost formation. Currently, efficient and energy-saving defrosting is becoming increasingly important. If a simple preparation method can further address the issues of high efficiency and environmental friendliness, and be used to treat frost formation in the refrigeration and air conditioning industry, it would be a promising anti-frost technology. Common jet defrosting methods, such as snow blowers, use strong airflow to remove snow. Patent CN210602418U discloses a compressed air defrosting device for tunnel-type quick-freezing machines used in food cold chain processing and rapid freezing. This device removes frost from fins using pressurized air ejected from nozzles, eliminating the need for equipment shutdown during defrosting and saving defrosting time. This invention applies jet defrosting technology to the defrosting of finned tube heat exchangers, but the strong airflow may cause wear and tear on the device and consume a lot of energy. To address this, this patent proposes an air conditioning defrosting method that uses high-speed airflow to blow away frost between the fins and features adjustable nozzles, resulting in a more efficient, environmentally friendly, and energy-saving defrosting process for air conditioning systems. Summary of the Invention

[0003] The present invention aims to solve the problem of frost formation in finned tube heat exchangers by providing a pneumatic defrosting device for finned tube heat exchangers. This device utilizes suitable air velocity and nozzle conditions to blow away frost and suppress frost formation, thereby solving the problem of frost formation on the heat exchanger fins.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a pneumatic defrosting device for a finned tube heat exchanger, comprising a finned tube heat exchanger, an air compressor, an air tank, a dryer filter, an air supply connection pipe, an air jet assembly, an electric control box, a solenoid valve, an auxiliary heating device, and adjustment knobs. The air compressor is a commercially available air pump compressor. The air tank is equipped with a safety valve, a pressure gauge, and a bottom exhaust valve. The air tank is connected to the air compressor via a connection pipe, on which a dryer filter is installed. The jet pipe assembly is connected to the air storage tank via a connecting pipe. The connecting pipe is equipped with a solenoid valve to control the flow rate to the jet pipe assembly. Each jet pipe is equipped with a solenoid valve and an adjustment knob, and contains multiple nozzles. The solenoid valve and adjustment knob are connected and controlled by an electric control box. The solenoid valve controls the jet flow rate, and the adjustment knob adjusts the nozzles on the jet pipe to change the jet angle. The bottom of the jet pipe assembly is mounted on a slide rail and is placed at a certain interval, at the same height as the finned tube heat exchanger. The through pipe at the bottom of the jet pipe assembly is equipped with an auxiliary heating device, which is also controlled by the electric control box. Through electric heating, the compressed gas can be heated to improve defrosting efficiency. The electric control box is switched on and off to supply high-pressure gas for defrosting via the air compressor.

[0005] Preferably, a solenoid valve is installed on the connecting pipe between the jet pipe assembly and the gas storage tank to maintain stable equipment operation.

[0006] As a preferred option, the capacity of the gas storage tank is designed according to the defrosting frequency of the air conditioning system, such as 10L-20L for residential use and 50L-100L for commercial use.

[0007] Preferably, a dryer filter is installed on the connecting pipe between the air compressor and the air tank to ensure that the injected gas is free of water vapor and impurities, and to prevent secondary frost or equipment corrosion.

[0008] Preferably, the jet pipe assembly consists of multiple jet pipes, each equipped with a solenoid valve, which allows for zoned defrosting control, preventing a sudden drop in air pressure when fully open and maintaining stable equipment operation.

[0009] Preferably, each jet pipe in the jet pipe assembly is connected as a whole through the bottom main pipe, and the jet pipe assembly is connected to a guide rail at the bottom so that the jet pipe assembly can move back and forth, and the distance between the jet pipe assembly and the heat exchanger can be adjusted during defrosting to change the defrosting efficiency.

[0010] Preferably, each jet pipe in the jet pipe assembly corresponds to a specific fin, and the nozzle angle is adjusted by a knob on the jet pipe to change the defrosting efficiency.

[0011] Preferably, an auxiliary heating device is installed next to the pipe. After the frost layer falls off, a small amount of floating ice may be generated, which can be removed by heating the compressed gas.

[0012] The invention provides a pneumatic defrosting device for a finned tube heat exchanger, which is carried out according to the following steps:

[0013] The compressed gas from the air compressor is stored in a storage tank for use during defrosting. To address different frost conditions, the nozzle angle on the jet pipe assembly can be adjusted, as can the distance between the jet pipe assembly and the heat exchanger. When defrosting is required, the electric control box switch is activated, sending a command, and the defrosting device begins operation. The solenoid valve opens, and compressed air flows through the storage tank to the main pipe at the bottom of the jet pipe assembly, then to each jet pipe and finally to the nozzle. The high-pressure airflow impacts the frost layer between the heat exchanger fins, rapidly stripping away ice crystals using kinetic energy and thermodynamic effects. The frost layer falls off the fins, and the defrost water is discharged through the drain trough at the bottom of the evaporator, completing the defrosting process.

[0014] After defrosting is complete, the electric control box issues a stop command. The control system and control method of the electric control box in this invention adopt existing technology, and will not be described in detail here.

[0015] The beneficial effects of this invention are:

[0016] The pneumatic defrosting technology used in this invention has the advantages of being simple, environmentally friendly, energy-efficient, and highly effective.

[0017] This invention uses a variable jet pipe assembly defrosting method, which has the advantages of local defrosting, low energy consumption, and high efficiency. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 and Figure 2 A schematic diagram of the pneumatic defrosting device for a finned tube heat exchanger provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of adjusting the nozzle angle in a variable jet tube assembly according to an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram illustrating the adjustment of the distance between the jet tube assembly and the heat exchanger in a variable jet tube assembly according to an embodiment of the present invention.

[0022] In the attached image:

[0023] 1. Air compressor; 2. Dryer filter; 3. Air tank; 4. Exhaust valve; 5. Safety valve; 6. Pressure gauge; 7. Solenoid valve; 8. Guide rail; 9. Through pipe; 10. Auxiliary heating device; 11. Jet pipe assembly; 12. Adjustment knob; 13. Finned tube heat exchanger. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the example figures.

[0025] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] Example 1;

[0027] See Figure 1

[0028] The electric control box uses existing technology, which will not be described in detail in this diagram.

[0029] like Figure 1 As shown, this invention provides a pneumatic defrosting device for a finned tube heat exchanger, comprising an electric control box, an air compressor 1, a dryer filter 2, an air tank 3, an exhaust valve 4, a safety valve 5, a pressure gauge 6, a solenoid valve 7, a guide rail 8, a connecting pipe 9, an auxiliary heating device 10, a jet pipe assembly 11, and an adjusting knob 12. The air compressor 1 is connected to the air tank 3 via a connecting pipe, on which the dryer filter 2 is mounted. The air tank is equipped with the exhaust valve 4, safety valve 5, and pressure gauge 6. The air tank 3 is connected to the connecting pipe 9 via a connecting pipe, on which the solenoid valve 7 is mounted. The auxiliary heating device 10 is located beside the connecting pipe 9 and connected to the jet pipe assembly 11. The jet pipe assembly 11 consists of multiple jet pipes, each equipped with an adjusting knob 12 and a solenoid valve 7 at its connection point with the connecting pipe. The bottom of the jet pipe assembly 11 is equipped with a guide rail 8.

[0030] Example 2

[0031] See Figure 1 , Figure 2 and Figure 3

[0032] like Figure 3 As shown, this invention provides a schematic diagram of adjustable nozzle angle for a variable jet pipe assembly. Because the conditions for frost formation vary—namely, different airflow rates, temperatures, and speeds, and different fin surface temperatures and states—the resulting frost layers have different structures. During jet-type defrosting, the angle of the nozzle on each jet pipe of the jet pipe assembly 11 can be adjusted using the adjustment knob 12. For example, adjusting the nozzle angle from 0 degrees to 30 degrees or 330 degrees will affect the shear force of the ejected gas, thus affecting the defrosting effect. The adjustable nozzle angle can increase the defrosting area of ​​the pneumatic defrosting device.

[0033] Example 3

[0034] See Figure 1 , Figure 2 and Figure 4

[0035] like Figure 4 As shown in the diagram, the present invention provides a schematic diagram of adjusting the distance between the jet pipe assembly and the heat exchanger in a variable jet pipe assembly. The bottom of the jet pipe assembly 11 is equipped with a guide rail 8. During jet defrosting, the distance between the jet pipe assembly 11 and the heat exchanger 13 can be adjusted by moving the jet pipe assembly back and forth on the guide rail 8. The change of the distance D between the nozzle and the heat exchanger fins will affect the shear force of the ejected gas, thereby affecting the defrosting effect. The adjustable distance between the jet pipe assembly and the heat exchanger can increase the defrosting effect of the pneumatic defrosting device.

[0036] The technical solution of the present invention has been described above with reference to one embodiment shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make various other corresponding changes and modifications based on the above-described technical solution and concept, and all such changes and modifications should fall within the scope of protection of the claims of the present invention.

Claims

1. An air-blast defrosting device for a finned tube heat exchanger, characterised in that: It consists of an electric control box, an air compressor (1), a dryer filter (2), an air tank (3), an exhaust valve (4), a safety valve (5), a pressure gauge (6), a solenoid valve (7), a guide rail (8), a through pipe (9), an auxiliary heating device (10), an air jet assembly (11), and an adjustment knob (12), and is used to defrost the finned tube heat exchanger (13).

2. The device according to claim 1, wherein: The air compressor (1) is connected to the air storage tank (3) through a connecting pipe. The air storage tank is connected to the through pipe (9) through a connecting pipe. The through pipe (9) is connected to the jet pipe assembly (11). An auxiliary heating device (10) is installed after the through pipe (9). The jet pipe assembly (11) is composed of multiple parallel jet pipes. Each jet pipe is equipped with a solenoid valve (7) and an adjustment knob (12) and contains multiple nozzles. Each nozzle faces the fins of its corresponding heat exchanger (13). The electric control box is used to control the start and stop of defrosting.

3. The device according to claim 1, wherein: The dryer filter (2) is installed on the connecting pipe between the air compressor (1) and the air tank (3) to ensure that the sprayed air is free of water vapor and impurities, and to avoid secondary frost or equipment corrosion.

4. The device according to claim 1, wherein: A solenoid valve (7) is installed on the connecting pipe between the gas storage tank (3) and the through pipe (9), and a solenoid valve (7) is installed at the connection between each jet pipe and the through pipe.

5. The device according to claim 1, wherein: The gas storage tank is equipped with a safety valve (5) and a pressure gauge (6), and an exhaust valve (4) is installed at the bottom.

6. The device according to claim 1, wherein: The jet pipe assembly (11) is fixed to the side of the heat exchanger (13) via the guide rail (8) and can move back and forth along the guide rail (8) to change the defrosting effect.

7. The device according to claim 1, wherein: The nozzles in each jet pipe of the jet pipe assembly (11) can adjust the nozzle angle by adjusting the knob (12) to change the defrosting area.

8. The device according to claim 1, wherein: An auxiliary heating device is installed next to the pipe (9), which uses electric heating to heat the compressed gas to remove a small amount of floating ice generated during the defrosting process.

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