Fin heat exchanger defrosting system and air source heat pump

Abstract

The utility model relates to the technical field of heat pumps, in particular to a fin type heat exchanger defrosting system and an air source heat pump, the fin type heat exchanger defrosting system comprises a spraying assembly, the spraying assembly comprises a spraying pipe and a first switch valve which are communicated with each other, and the first switch valve is communicated with the water outlet end of a water side heat exchanger. At least part of the spraying pipes are located above the fin type heat exchanger, and a plurality of spraying holes are formed in the portions, right opposite to the fin type heat exchanger, of the spraying pipes at intervals. And the pipeline purging assembly is communicated with the spraying pipe and is used for blowing out residual water in the spraying pipe from the spraying holes. The air source heat pump defrosting device can guarantee the defrosting effect, and therefore normal work of the air source heat pump is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a finned heat exchanger defrosting system and an air source heat pump. Background Technology

[0002] Finned heat exchangers, as traditional heat exchangers, are widely used in various air-source heat pump units. When the outside temperature is low, moisture in the air easily condenses on the surface of the finned heat exchanger, forming a frost layer. The formation of frost increases airflow resistance, leading to a reduction in fan flow, deteriorating the performance of the air-source heat pump, and in severe cases, even damaging the machine.

[0003] In existing technologies, air source heat pump defrosting mainly employs four-way valve reverse defrosting technology or hot gas bypass defrosting technology. This involves circulating high-temperature, high-pressure refrigerant vapor inside the finned heat exchanger to heat the heat exchange tubes. The heat is then transferred to the fins via heat conduction, melting the frost layer. The defrosting effectiveness of these methods is greatly affected by the exhaust temperature and the flow path distribution within the finned heat exchanger. When the exhaust temperature is low, the heat transferred to the fins is insufficient to completely melt the frost layer into water that flows down. Alternatively, uneven flow path distribution within the heat exchanger, with some heat exchange tubes experiencing relatively high internal resistance and thus receiving less refrigerant gas, can result in prolonged defrosting times and incomplete defrosting, especially noticeable when the outside temperature is low.

[0004] Therefore, a finned heat exchanger defrosting system and an air source heat pump are needed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a defrosting system for finned heat exchangers and an air source heat pump, which can ensure the defrosting effect and thus ensure the normal operation of the air source heat pump.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The finned heat exchanger defrosting system includes:

[0008] A spray assembly includes interconnected spray pipes and a first switching valve. The first switching valve is connected to the outlet of a water-side heat exchanger. At least a portion of the spray pipes are located above the finned heat exchanger, and a plurality of spray holes are spaced apart on the portion of the spray pipes facing the finned heat exchanger.

[0009] A pipeline purging assembly, which is connected to the spray pipe, is used to blow out residual water in the spray pipe from the spray holes.

[0010] In some embodiments, the pipeline purging assembly includes an air blowing assembly and an air blowing pipeline that are interconnected, the air blowing pipeline being connected to the spray pipe, and a second switching valve being provided on the air blowing pipeline.

[0011] In some embodiments, the blowing assembly includes an air compressor connected to the blowing line.

[0012] In some embodiments, the air blowing assembly further includes an air storage tank disposed between the air compressor and the air blowing pipeline, and the air storage tank is connected to both the air compressor and the air blowing pipeline.

[0013] In some embodiments, the gas storage tank is equipped with a barometer.

[0014] In some embodiments, the gas storage tank is provided with a safety relief pipeline, which is connected to the gas storage tank, and a safety valve is provided on the safety relief pipeline.

[0015] In some embodiments, a temperature sensor is provided at the outlet of the water-side heat exchanger.

[0016] In some embodiments, the first switching valve is an electromagnetic switching valve.

[0017] In some embodiments, a spray water pump is also included, which is disposed on the spray pipe.

[0018] An air source heat pump includes a water-side heat exchanger, a finned heat exchanger, and a finned heat exchanger defrosting system as described above. The spray pipes of the finned heat exchanger defrosting system are connected to the water outlet of the water-side heat exchanger, and at least a portion of the spray pipes are located above the finned heat exchanger.

[0019] The beneficial effects of this utility model are:

[0020] This utility model provides a defrosting system for finned heat exchangers. The spray assembly includes interconnected spray pipes and a first switching valve. The first switching valve is connected to the outlet of the water-side heat exchanger. At least a portion of the spray pipes is located above the finned heat exchanger, and multiple spray holes are spaced apart on the portion of the spray pipes facing the finned heat exchanger. A pipeline purging assembly is connected to the spray pipes. When defrosting the finned heat exchanger is required, the first switching valve is opened, allowing the warmer water from the water-side heat exchanger to enter the spray pipes and be sprayed out through the spray holes to directly contact the frost for heat exchange. This quickly melts the frost accumulated on the finned heat exchanger, achieving rapid and effective defrosting while ensuring the defrosting effect and thus guaranteeing the normal operation of the air-source heat pump. After defrosting, the pipeline purging assembly is used to drain any remaining water from the spray pipes through the spray holes, ensuring the spray pipes remain dry and preventing them from freezing.

[0021] The present invention provides an air source heat pump, including a water-side heat exchanger, a finned heat exchanger, and a finned heat exchanger defrosting system as described above. The finned heat exchanger defrosting system can ensure the defrosting effect, thereby ensuring the normal operation of the air source heat pump. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a defrosting system for a finned heat exchanger according to this utility model.

[0024] Figure 2 This is a schematic diagram of a finned heat exchanger defrosting system in defrosting mode according to the present invention;

[0025] Figure 3 This is a schematic diagram of a finned heat exchanger defrosting system in the purging state according to this utility model.

[0026] In the picture:

[0027] 1. Spray assembly; 11. Spray pipe; 12. First switch valve; 13. Spray water pump; 2. Pipeline purging assembly; 21. Air tank; 211. Barometer; 22. Air purging pipeline; 23. Second switch valve; 3. Water-side heat exchanger; 4. Finned heat exchanger. Detailed Implementation

[0028] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0029] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0030] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0031] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0032] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0033] Finned heat exchangers, as traditional heat exchangers, are widely used in various air-source heat pump units. When the outside temperature is low, moisture in the air easily condenses on the surface of the finned heat exchanger, forming a frost layer. The formation of frost increases airflow resistance, leading to a reduction in fan flow, deteriorating the performance of the air-source heat pump, and in severe cases, even damaging the machine.

[0034] To solve the above problems and ensure both effective defrosting and normal operation of the air source heat pump, such as... Figures 1-3 As shown, this utility model provides a defrosting system for finned heat exchangers. The defrosting system for finned heat exchangers includes a spray assembly 1 and a pipeline purging assembly 2.

[0035] The spray assembly 1 includes interconnected spray pipes 11 and a first switching valve 12. The first switching valve 12 is connected to the outlet of the water-side heat exchanger 3. At least a portion of the spray pipes 11 are located above the finned heat exchanger 4, and multiple spray holes are spaced apart on the portion of the spray pipes 11 facing the finned heat exchanger 4. The pipeline purging assembly 2 is connected to the spray pipes 11 and is used to blow out residual water in the spray pipes 11 from the spray holes.

[0036] When defrosting of the finned heat exchanger 4 is required, the first switch valve 12 is opened, allowing the higher-temperature water in the water-side heat exchanger 3 to enter the spray pipe 11 under the action of the circulating pump in the air source heat pump. The water is then sprayed out through the spray holes on the spray pipe 11, directly contacting the frost for heat exchange. This quickly melts the frost accumulated on the finned heat exchanger 4 into water, achieving rapid and effective defrosting while ensuring the defrosting effect and thus guaranteeing the normal operation of the air source heat pump. After defrosting, the remaining water in the spray pipe 11 is discharged through the spray holes using the pipeline purging assembly 2, ensuring the spray pipe 11 remains dry and preventing it from freezing.

[0037] In some embodiments, the pipeline purging assembly 2 includes an air blowing assembly and an air blowing pipeline 22 connected to each other. The air blowing pipeline 22 is connected to the spray pipe 11, and a second switching valve 23 is provided on the air blowing pipeline 22. When the pipeline purging assembly 2 is working, the air blowing assembly blows compressed gas into the air blowing pipeline 22. The compressed gas enters the spray pipe 11 through the air blowing pipeline 22, blowing out all the residual water in the spray pipe 11, thereby ensuring that the spray pipe 11 is dry and preventing the spray pipe 11 from freezing after spraying. By controlling the opening and closing of the second switching valve 23, the connection and disconnection between the air blowing pipeline 22 and the spray pipe 11 can be controlled.

[0038] In some embodiments, the air blowing assembly includes an air compressor connected to the air blowing pipe 22. The air compressor can compress air, and the compressed air has a certain pressure, which can effectively discharge residual water in the spray pipe 11 through the spray holes.

[0039] In some embodiments, the air blowing assembly further includes an air storage tank 21, which is disposed between the air compressor and the air blowing pipeline 22, and is connected to both the air compressor and the air blowing pipeline 22. By providing the air storage tank 21, compressed gas at a certain pressure can be stored. When the second switch valve 23 is opened, the high-pressure gas stored in the air storage tank 21 can be discharged into the spray pipe 11 through the air blowing pipeline 22, promptly cleaning any residual water in the spray pipe 11.

[0040] In some embodiments, a pressure gauge 211 is provided on the air tank 21. By providing the pressure gauge 211, the gas pressure in the air tank 21 can be easily displayed, thereby enabling the air compressor to be controlled to be in an operating state or a closed state based on the gas pressure in the air tank 21.

[0041] In some embodiments, the gas storage tank 21 is equipped with a safety relief pipeline connected to the gas storage tank 21, and a safety valve is installed on the safety relief pipeline. By providing the safety relief pipeline and safety valve, when the gas pressure in the gas storage tank 21 exceeds a preset pressure value, compressed air directly pushes the safety valve to open, allowing the gas to be discharged through the safety relief pipeline. This configuration ensures that the gas pressure inside the gas storage tank 21 remains within a safe range, thereby preventing safety accidents.

[0042] In some embodiments, a temperature sensor is provided at the outlet of the water-side heat exchanger 3. By providing a temperature sensor, the outlet water temperature of the water-side heat exchanger 3 can be detected in real time, and defrosting can only be performed when the outlet water temperature meets the requirements.

[0043] In some embodiments, the first switching valve 12 is an electromagnetic switching valve. This configuration facilitates automatic defrosting control. When the controller of the air source heat pump detects that the outlet water temperature of the water-side heat exchanger 3 reaches the defrosting temperature requirement, and simultaneously the finned heat exchanger 4 requires defrosting, the controller can control the first switching valve 12 to open, thereby performing spray defrosting. After defrosting is complete, the first switching valve 12 can be directly closed. In this embodiment, the second switching valve 23 can also be an electromagnetic switching valve, facilitating automated control of residual water purging from the spray pipe 11. The controller can be a microcontroller or a PLC, and the control of the first switching valve 12 and the second switching valve 23 is conventional control, which will not be elaborated further here.

[0044] In some embodiments, the finned heat exchanger defrosting system further includes a spray water pump 13, which is mounted on the spray pipe 11. By installing the spray water pump 13, the flow rate and velocity of the outgoing water can be increased, thereby enabling the frost that has formed on the finned heat exchanger 4 to be removed quickly in a short time.

[0045] In some embodiments, the spray holes on the spray pipe 11 are small round holes of 0.5mm-2.0mm, and the spacing between the spray holes is 50mm-100mm. Specifically, the standard is that the water sprayed through the spray holes can evenly cover the upper end of the finned heat exchanger 4 during actual testing. In this way, the defrosting effect on the finned heat exchanger 4 can be guaranteed.

[0046] The working process of the defrosting system of this finned heat exchanger is as follows:

[0047] When the outlet water temperature of the water-side heat exchanger 3 is ≥20℃, and the finned heat exchanger 4 is detected to have reached the defrosting condition, the controller simultaneously initiates the conventional refrigerant defrosting process (i.e., enters the four-way valve reverse defrosting) and opens the first switch valve 12. Hot water from the water-side heat exchanger 3 enters the spray pipe and sprays onto the finned heat exchanger 4 below through the spray nozzles for 1 minute (the time is adjustable, ensuring the frost layer on the finned heat exchanger 4 completely melts into water). Then, the controller de-energizes the first switch valve 12 and energizes the second switch valve 23 for 10 seconds (the time is adjustable, ensuring the water in the spray pipe 11 is completely drained). Compressed air from the air tank 21 enters the spray pipe 11 through the air blowing pipe 22, discharging the water in the spray pipe 11 from the spray nozzles. The controller then controls the second switch valve 23. When the finned heat exchanger 4 reaches the exit defrosting condition, the defrosting process ends, and the air source heat pump switches to heating mode.

[0048] When the outlet water temperature of the water-side heat exchanger 3 is <20℃, the first switch valve 12 and the second switch valve 23 are always de-energized, and the defrosting is entered and exited by conventional refrigerant defrosting action (i.e., entering the four-way valve for reverse defrosting).

[0049] This embodiment also provides an air source heat pump, which includes a water-side heat exchanger 3, a finned heat exchanger 4, and a finned heat exchanger defrosting system as described above. The spray pipes 11 of the finned heat exchanger defrosting system are connected to the water outlet of the water-side heat exchanger 3, and at least a portion of the spray pipes 11 are located above the finned heat exchanger 4. The finned heat exchanger defrosting system can ensure the defrosting effect, thereby ensuring the normal operation of the air source heat pump.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A defrosting system for a finned heat exchanger, characterized in that, The application relates to a defrosting system for a finned heat exchanger. The defrosting system comprises a spraying assembly (1) and a pipeline blowing assembly (2). The spraying assembly (1) comprises a spraying pipe (11) and a first switch valve (12) in communication with each other, the first switch valve (12) is communicated with a water outlet end of a water side heat exchanger (3), at least part of the spraying pipe (11) is located above a finned heat exchanger (4), and a plurality of spraying holes are arranged on the spraying pipe (11) opposite to the finned heat exchanger (4).

2. The fin heat exchanger defrosting system according to claim 1, wherein The pipeline blowing assembly (2) is communicated with the spraying pipe (11) and used for blowing out residual water in the spraying pipe (11) from the spraying holes.

3. The fin heat exchanger defrosting system according to claim 2, wherein The pipeline blowing assembly (2) comprises a blowing assembly and a blowing pipeline (22) in communication with each other, the blowing pipeline (22) is communicated with the spraying pipe (11), and a second switch valve (23) is arranged on the blowing pipeline (22).

4. The fin heat exchanger defrosting system according to claim 3, wherein The blowing assembly comprises an air compressor communicated with the blowing pipeline (22).

5. The fin heat exchanger defrosting system of claim 4, wherein, The blowing assembly further comprises an air storage tank (21) arranged between the air compressor and the blowing pipeline (22), the air storage tank (21) is communicated with the air compressor and the blowing pipeline (22) respectively.

6. The fin heat exchanger defrosting system of claim 4, wherein, An air pressure gauge (211) is arranged on the air storage tank (21).

7. The fin heat exchanger defrosting system according to any one of claims 1 to 6, characterized in that, A safety relief pipeline is arranged on the air storage tank (21) and communicated with the air storage tank (21), and a safety valve is arranged on the safety relief pipeline.

8. The fin heat exchanger defrosting system according to any one of claims 1-6, wherein A temperature sensor is arranged on the water outlet end of the water side heat exchanger (3).

9. The fin heat exchanger defrosting system according to any one of claims 1-6, wherein The first switch valve (12) is an electromagnetic switch valve.

10. An air source heat pump characterised in that, A spraying water pump (13) is arranged on the spraying pipe (11). The application further relates to a water side heat exchanger (3), a finned heat exchanger (4) and a defrosting system for the finned heat exchanger, the spraying pipe (11) of the defrosting system is communicated with the water outlet end of the water side heat exchanger (3), and at least part of the spraying pipe (11) is located above the finned heat exchanger (4).

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