Defrosting device of fin type heat exchanger

Abstract

The utility model discloses a fin type heat exchanger defrosting device which comprises at least two sets of photoelectric sensors, and the at least two sets of photoelectric sensors are used for monitoring the thickness of a frost layer between the top face and the bottom face of a fin type heat exchanger and the thickness of a frost layer between the two side faces of the fin type heat exchanger respectively. The photoelectric sensor is inserted between fins of the fin heat exchanger, the photoelectric sensor is electrically connected with the power supply and the controller, the power supply provides electric energy for the photoelectric sensor, the photoelectric sensor converts the electric energy into a voltage signal value and transmits the voltage signal value to the controller, and the controller controls the defrosting structure to defrost the fin heat exchanger. According to the defrosting device of the fin type heat exchanger, the controller controls the defrosting structure to defrost the fin type heat exchanger, the frosting state of fins can be timely and accurately mastered, it is guaranteed that defrosting is clean, and the comprehensive heating efficiency of a unit is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of finned heat exchangers, and particularly relates to a defrosting device for a finned heat exchanger. Background Art

[0002] At present, air source heat pumps are increasingly used for heating in cold regions. When the temperature of the heat exchanger on the heat source side is lower than the dew point temperature of the ambient air, serious frosting will occur on the surface of the heat exchanger. Generally, the heat exchanger on the heat source side of the heat pump is of a finned tube structure. Frost formation on the finned heat exchanger will block the fin air flow channels. As the air pressure drop increases, the heat transfer resistance continuously increases, greatly affecting the heat transfer efficiency of the heat exchanger, and the heating capacity of the heat pump unit will decay severely. At this time, the heat pump unit needs to defrost in time to maintain the normal operation of the system, and defrost control is the key and difficult point of the system operation control. If the defrosting time is too short, the defrosting is incomplete and the heat transfer efficiency of the heat exchanger is affected. If the defrosting time is too long, the operating performance COP of the unit is affected. And defrosting when the frost layer is not thick or there is no frost, that is, premature defrosting or incorrect defrosting, will greatly affect the heating efficiency of the unit. When to defrost the finned heat exchanger during the operation of the heat pump and the control of the defrosting duration are the key points to ensure the stable and efficient operation of the heat pump system.

[0003] At present, the defrosting control strategies of heat pump units mostly perform defrosting control by monitoring the coil temperature and ambient temperature and accumulating the defrosting interval time. However, when the heat pump is under complex environmental conditions or working in different environments, the defrosting parameters are also different, and it is impossible to achieve timely, accurate, and clean defrosting control.

[0004] Therefore, there is an urgent need to design a defrosting device for a finned heat exchanger to solve the problem of unable to defrost in time, accurately, and cleanly mentioned above. Content of the Utility Model

[0005] To solve the technical problem of unable to defrost in time, accurately, and cleanly mentioned in the background art, a defrosting device for a finned heat exchanger is provided to solve the above problems.

[0006] To achieve the above object, the specific technical solution of the defrosting device for a finned heat exchanger of the present utility model is as follows:

[0007] A defrosting device for a finned heat exchanger includes at least two groups of photoelectric sensors. At least two groups of photoelectric sensors respectively monitor the frost layer thickness between the top surface and the bottom surface of the finned heat exchanger and the frost layer thickness between the two side surfaces of the finned heat exchanger. The photoelectric sensors are inserted and arranged between the fins of the finned heat exchanger. It also includes a power supply and a controller. The photoelectric sensors are electrically connected to the power supply and the controller. The power supply provides electrical energy for the photoelectric sensors. The photoelectric sensors convert the electrical energy into voltage signal values and transmit them to the controller. The controller controls the defrosting structure to defrost the finned heat exchanger.

[0008] Further, the optoelectronic sensor includes a first group of optoelectronic sensors and a second group of optoelectronic sensors. The first group of optoelectronic sensors monitors the thickness of the frost layer between the top surface and the bottom surface of the fin heat exchanger, and the second group of optoelectronic sensors monitors the thickness of the frost layer between the two side surfaces of the fin heat exchanger.

[0009] Further, the first group of optoelectronic sensors includes a first optoelectronic transmitter and a first optoelectronic receiver. The first optoelectronic transmitter is plugged between the fins on the top surface of the fin heat exchanger, and the first optoelectronic receiver is plugged between the fins on the bottom surface of the fin heat exchanger.

[0010] Further, the optoelectronic sensor further includes a third group of optoelectronic sensors. The second group of optoelectronic sensors is plugged between the fins near the copper tubes on the two side surfaces of the fin heat exchanger, and the third group of optoelectronic sensors is plugged between the fins near the middle position on the two side surfaces of the fin heat exchanger.

[0011] Further, the second group of optoelectronic sensors includes a second optoelectronic transmitter and a second optoelectronic receiver. The second optoelectronic transmitter is plugged between the fins on one side surface of the fin heat exchanger near the copper tube, and the second optoelectronic receiver is plugged between the fins on the other side surface of the fin heat exchanger near the copper tube.

[0012] Further, the third group of optoelectronic sensors includes a third optoelectronic transmitter and a third optoelectronic receiver. The third optoelectronic transmitter is plugged between the fins at the middle position on one side surface of the fin heat exchanger, and the third optoelectronic receiver is plugged between the fins at the middle position on the other side surface of the fin heat exchanger.

[0013] Further, it further includes a plug-in part. The optoelectronic sensor is arranged on the plug-in part, and the plug-in part is plugged between the fins of the fin heat exchanger.

[0014] Further, the plug-in part is provided with a plug-in portion, and the plug-in portion is plugged between the adjacent fins of the fin heat exchanger to fix the optoelectronic sensor on the fin heat exchanger.

[0015] Further, there are multiple plug-in portions, and the multiple plug-in portions are arranged at intervals, and each plug-in portion is plugged between the adjacent fins of the fin heat exchanger.

[0016] Further, the plug-in part is further provided with a mounting portion, and the optoelectronic sensor is mounted on the mounting portion.

[0017] The defrosting device of the fin heat exchanger of the present utility model has the following advantages:

[0018] By setting at least two groups of photoelectric sensors to respectively monitor the frost layer thickness between the top surface and the bottom surface of the fin heat exchanger and the frost layer thickness between the two side surfaces of the fin heat exchanger, the photoelectric sensors are plugged and set between the fins of the fin heat exchanger. It also includes a power supply and a controller. The photoelectric sensors are electrically connected to the power supply and the controller. The power supply provides electrical energy for the photoelectric sensors, and the photoelectric sensors convert the electrical energy into voltage signal values and transmit them to the controller. The controller controls the defrosting structure to defrost the fin heat exchanger, which can timely and accurately grasp the frosting state of the fins, ensure clean defrosting, and improve the comprehensive heating efficiency of the unit. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the fin heat exchanger defrosting device of the present invention;

[0020] Figure 2 is Figure 1 an enlarged structural diagram of A in

[0021] Figure 3 It is a top view of the fin heat exchanger defrosting device of the present invention;

[0022] Figure 4 is Figure 1 an enlarged structural diagram of B in

[0023] Figure 5 is Figure 1 an enlarged structural diagram of C in

[0024] Explanation of the marks in the figure:

[0025] 1. Fin heat exchanger; 2. First group of photoelectric sensors; 21. First photoelectric emitter; 22. First photoelectric receiver; 3. Second group of photoelectric sensors; 31. Second photoelectric emitter; 32. Second photoelectric receiver; 4. Third group of photoelectric sensors; 41. Third photoelectric emitter; 42. Third photoelectric receiver; 5. Plug-in part; 51. Plug-in portion; 52. Installation portion. Detailed Embodiment

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0027] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of the present utility model and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0028] The following will refer to the attached Figure 1 to the attached Figure 5 Describe the defrosting device of the fin heat exchanger of the present utility model.

[0029] As Figures 1 to 5 shown, the defrosting device of the fin heat exchanger in the present utility model includes at least two groups of photoelectric sensors. The at least two groups of photoelectric sensors respectively monitor the frost layer thickness between the top surface and the bottom surface of the fin heat exchanger 1 and the frost layer thickness between the two side surfaces of the fin heat exchanger 1. The photoelectric sensors are inserted and arranged between the fins of the fin heat exchanger 1. It also includes a power supply and a controller. The photoelectric sensors are electrically connected to the power supply and the controller. The power supply provides electrical energy for the photoelectric sensors. The photoelectric sensors convert the electrical energy into voltage signal values and transmit them to the controller. The controller controls the defrosting structure to defrost the fin heat exchanger 1. In this embodiment, the controller compares the average value of the voltage signal values of multiple groups of photoelectric sensors with a preset voltage value. When the average value is greater than the preset voltage value, the controller controls the defrosting structure to defrost the fin heat exchanger 1.

[0030] By setting at least two groups of photoelectric sensors to respectively monitor the frost layer thickness between the top surface and the bottom surface of the fin heat exchanger 1 and the frost layer thickness between the two side surfaces of the fin heat exchanger 1, the photoelectric sensors are inserted and arranged between the fins of the fin heat exchanger 1. It also includes a power supply and a controller. The photoelectric sensors are electrically connected to the power supply and the controller. The power supply provides electrical energy for the photoelectric sensors. The photoelectric sensors convert the electrical energy into voltage signal values and transmit them to the controller. The controller controls the defrosting structure to defrost the fin heat exchanger 1, which can timely and accurately master the frosting state of the fins, ensure clean defrosting, and improve the comprehensive heating efficiency of the unit. In this embodiment, the controller compares the average value of the voltage signal values of multiple groups of photoelectric sensors with a preset voltage value. When the average value is greater than the preset voltage value, the controller controls the defrosting structure to defrost the fin heat exchanger 1. In other embodiments, the controller can also compare the voltage signals transmitted by each photoelectric sensor with the preset voltage value respectively, and control the defrosting structure to defrost different parts of the fin heat exchanger 1.

[0031] Furthermore, as Figure 1 and Figure 5As shown in the figure, the optoelectronic sensor includes a first group of optoelectronic sensors 2 and a second group of optoelectronic sensors 3. The first group of optoelectronic sensors 2 monitors the thickness of the frost layer between the top surface and the bottom surface of the fin heat exchanger 1, and the second group of optoelectronic sensors 3 monitors the thickness of the frost layer between the two side surfaces of the fin heat exchanger 1. The first group of optoelectronic sensors 2 includes a first optoelectronic transmitter 21 and a first optoelectronic receiver 22. The first optoelectronic transmitter 21 is inserted between the fins on the top surface of the fin heat exchanger 1, and the first optoelectronic receiver 22 is inserted between the fins on the bottom surface of the fin heat exchanger 1.

[0032] Further, as Figure 1 and Figure 3 shown in the figure, the optoelectronic sensor further includes a third group of optoelectronic sensors 4. The second group of optoelectronic sensors 3 is inserted between the fins near the copper tube on the two side surfaces of the fin heat exchanger 1, and the third group of optoelectronic sensors 4 is inserted between the fins near the middle position on the two side surfaces of the fin heat exchanger 1.

[0033] Further, as Figure 1 and Figure 3 shown in the figure, the second group of optoelectronic sensors 3 includes a second optoelectronic transmitter 31 and a second optoelectronic receiver 32. The second optoelectronic transmitter 31 is inserted between the fins on one side surface of the fin heat exchanger 1 near the copper tube, and the second optoelectronic receiver 32 is inserted between the fins on the other side surface of the fin heat exchanger 1 near the copper tube. The third group of optoelectronic sensors 4 includes a third optoelectronic transmitter 41 and a third optoelectronic receiver 42. The third optoelectronic transmitter 41 is inserted between the fins at the middle position on one side surface of the fin heat exchanger 1, and the third optoelectronic receiver 42 is inserted between the fins at the middle position on the other side surface of the fin heat exchanger 1.

[0034] By providing the first group of optoelectronic sensors 2, the second group of optoelectronic sensors 3, and the third group of optoelectronic sensors 4, it is possible to monitor the thickness of the frost layer between the top surface and the bottom surface of the fin heat exchanger 1 and the thickness of the frost layer on the side surfaces. In other embodiments, the optoelectronic sensor may also be provided with other numbers. Specifically, the number of optoelectronic sensors can be increased or decreased according to needs, and optoelectronic sensors can also be inserted at different positions of the fin heat exchanger 1 according to needs to monitor the thickness of the frost layer. Hereinafter, three groups of optoelectronic sensors will be introduced.

[0035] Further, as Figure 1 and Figure 5 shown in the figure, the first optoelectronic transmitter 21 and the first optoelectronic receiver 22 are arranged in the same straight line, the second optoelectronic transmitter 31 and the second optoelectronic receiver 32 are arranged in the same straight line, and the third optoelectronic transmitter 41 and the third optoelectronic receiver 42 are arranged in the same straight line.

[0036] The first optoelectronic emitter 21 and the first optoelectronic receiver 22 are placed in a straight-line position to ensure that the signal emitted by the first optoelectronic emitter 21 can be completely received by the first optoelectronic receiver 22. After the power supply inputs current to the first optoelectronic emitter 21, the first optoelectronic emitter 21 will emit an optical signal to the first optoelectronic receiver 22. The first optoelectronic receiver 22 will convert the received optical signal into a voltage signal, and this voltage signal is collected by a voltage signal collector and output to the controller. The second optoelectronic emitter 31 and the second optoelectronic receiver 32 are placed in a straight-line position to ensure that the signal emitted by the second optoelectronic emitter 31 can be completely received by the second optoelectronic receiver 32. After the power supply inputs current to the second optoelectronic emitter 31, the second optoelectronic emitter 31 will emit an optical signal to the second optoelectronic receiver 32. The second optoelectronic receiver 32 will convert the received optical signal into a voltage signal, and this voltage signal is collected by a voltage signal collector and output to the controller. The third optoelectronic emitter 41 and the third optoelectronic receiver 42 are placed in a straight-line position to ensure that the signal emitted by the third optoelectronic emitter 41 can be completely received by the third optoelectronic receiver 42. After the power supply inputs current to the third optoelectronic emitter 41, the third optoelectronic emitter 41 will emit an optical signal to the third optoelectronic receiver 42. The third optoelectronic receiver 42 will convert the received optical signal into a voltage signal. The three groups of voltage signals are collected by a voltage signal collector and output to the controller. The controller compares the average value of the three groups of voltage signal intensities with a preset voltage value. When the average voltage value is greater than the preset voltage value, the controller controls the defrosting structure to defrost the fin heat exchanger 1.

[0037] After the defrosting is carried out, when the frost layer is completely melted or the thickness of the frost layer is less than the target thickness, the controller outputs an end defrosting signal, and the unit enters the normal heating operation mode. During the operation of the unit, the thickness of the frost layer is continuously monitored and a signal is fed back to the controller. Defrosting the fin heat exchanger 1 can timely and accurately grasp the frosting state of the fins, ensure clean defrosting, and improve the comprehensive heating efficiency of the unit.

[0038] Further, as Figures 1 to 5 shown, the fin heat exchanger defrosting device in the present invention further includes a plug-in connector 5. The optoelectronic sensor is arranged on the plug-in connector 5, and the plug-in connector 5 is plugged between the fins of the fin heat exchanger 1. Specifically, the first optoelectronic emitter 21, the second optoelectronic emitter 31, the third optoelectronic emitter 41, the first optoelectronic receiver 22, the first optoelectronic receiver 22 and the third optoelectronic receiver 42 are all correspondingly arranged on a plug-in connector 5, and the plug-in connector 5 is plugged between the fins of the fin heat exchanger 1 to facilitate fixing the first optoelectronic emitter 21, the second optoelectronic emitter 31, the third optoelectronic emitter 41, the first optoelectronic receiver 22, the second optoelectronic receiver 32 and the third optoelectronic receiver 42 on the fin heat exchanger 1.

[0039] Further, asFigures 1 to 5 As shown, the connector 5 is provided with a plug-in part 51, and the plug-in part 51 is plugged between adjacent fins of the fin heat exchanger 1 to fix the photoelectric sensor on the fin heat exchanger 1. Specifically, the first photoelectric emitter 21, the second photoelectric emitter 31, the third photoelectric emitter 41, the first photoelectric receiver 22, the second photoelectric receiver 32 and the third photoelectric receiver 42 are plugged and fixed on the fin heat exchanger 1. In this embodiment, a plurality of plug-in parts 51 are provided, and the plurality of plug-in parts 51 are arranged at intervals, and each plug-in part 51 is plugged between adjacent fins of the fin heat exchanger 1.

[0040] Further, as Figures 1 to 5 shown, the connector 5 is further provided with a mounting part 52, and the photoelectric sensor is mounted on the mounting part 52. Specifically, the first photoelectric emitter 21, the second photoelectric emitter 31, the third photoelectric emitter 41, the first photoelectric receiver 22, the second photoelectric receiver 32 and the third photoelectric receiver 42 are mounted on the mounting part 52 of the corresponding connector 5.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fin heat exchanger defrosting device, characterized in that: The invention comprises at least two groups of photoelectric sensors, which respectively monitor the thickness of the frost layer between the top and bottom surfaces of the fin heat exchanger and the thickness of the frost layer between the two side surfaces of the fin heat exchanger. The photoelectric sensors are plugged in between the fins of the fin heat exchanger. The invention also comprises a power supply and a controller. The photoelectric sensors are electrically connected to the power supply and the controller. The power supply provides electrical energy to the photoelectric sensors. The photoelectric sensors convert the electrical energy into a voltage signal value and transmit it to the controller. The controller controls the defrosting structure to defrost the fin heat exchanger.

2. The fin heat exchanger defrosting device according to claim 1, characterized in that: The photoelectric sensors include a first group of photoelectric sensors and a second group of photoelectric sensors. The first group of photoelectric sensors monitors the thickness of the frost layer between the top and bottom surfaces of the fin heat exchanger, and the second group of photoelectric sensors monitors the thickness of the frost layer between the two side surfaces of the fin heat exchanger.

3. The fin heat exchanger defrosting device according to claim 2, characterized in that: The first group of photoelectric sensors includes a first photoelectric transmitter and a first photoelectric receiver. The first photoelectric transmitter is inserted between the fins on the top surface of the fin heat exchanger, and the first photoelectric receiver is inserted between the fins on the bottom surface of the fin heat exchanger.

4. The fin heat exchanger defrosting device according to claim 2, characterized in that: The photoelectric sensors also include a third group of photoelectric sensors. The second group of photoelectric sensors are inserted between the fins on both sides of the fin heat exchanger close to the copper tube, and the third group of photoelectric sensors are inserted between the fins on both sides of the fin heat exchanger close to the middle position.

5. The fin heat exchanger defrosting device according to claim 2, characterized in that: The second group of photoelectric sensors includes a second photoelectric transmitter and a second photoelectric receiver. The second photoelectric transmitter is inserted between the fins on one side of the fin heat exchanger close to the copper tube, and the second photoelectric receiver is inserted between the fins on the other side of the fin heat exchanger close to the copper tube.

6. The fin heat exchanger defrosting device according to claim 4, characterized in that: The third group of photoelectric sensors includes a third photoelectric transmitter and a third photoelectric receiver. The third photoelectric transmitter is inserted between the fins at the middle position of one side of the fin heat exchanger, and the third photoelectric receiver is inserted between the fins at the middle position of the other side of the fin heat exchanger.

7. The fin heat exchanger defrosting device according to claim 1, characterized in that: It also includes a plug-in connector, on which the photoelectric sensor is arranged, and the plug-in connector is plugged between the fins of the fin heat exchanger.

8. The fin heat exchanger defrosting device according to claim 7, characterized in that: The plug-in connector is provided with a plug-in portion, which is plugged between adjacent fins of the fin heat exchanger to fix the photoelectric sensor on the fin heat exchanger.

9. The fin heat exchanger defrosting device according to claim 8, characterized in that: A plurality of plug-in parts are provided, and the plurality of plug-in parts are arranged at intervals, and each plug-in part is plugged between adjacent fins of the fin heat exchanger.

10. The fin heat exchanger defrosting device according to claim 8 or 9, characterized in that: The plug connector is also provided with a mounting portion, and the photoelectric sensor is mounted on the mounting portion.

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