Automatic defrosting air source heat pump system

Abstract

The invention relates to the technical field of air source heat pumps, in particular to an automatic defrosting air source heat pump system. A defrosting assembly is arranged on the side, opposite to the windward side of a cooling fan, of an evaporator, a YZ double-axis moving module drives a moving base to move, and three-way valves are arranged on a first pipeline and a second pipeline in an original system pipeline of the air source heat pump correspondingly; a small part of a high-temperature and high-pressure refrigerant subjected to the action of the compressor is guided to the spiral heating pipe, when airflow is blown to the heat conduction fins through the defrosting fan, the airflow can be fully heated by the spiral heating pipe, and fixed-point efficient defrosting is conducted on the heat conduction fins; according to the air source heat pump system, the windward side of the cooling fan of the evaporator can be heated and defrosted in a targeted mode, due to the fact that the refrigerant flowing through the spiral heating pipe is only a small part of an original air source heat pump system, normal use of the air source heat pump is not affected in the defrosting process, and the load of the compressor does not need to be increased.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pumps, and in particular to an automatic defrosting air source heat pump system. Background Art

[0002] In the air source heat pump system, when the refrigerant flows through the evaporator, it absorbs heat through evaporation, which reduces the surrounding temperature. Although the evaporator is equipped with a fan to accelerate the air flow inside and outside the evaporator to avoid the temperature around the evaporator being too low, for outdoor environments with low ambient temperature and high humidity, the water in the air will frost at low temperatures and adhere to the surface of the evaporator fins, causing the evaporator's thermal conductivity to decrease. The frost on the evaporator fins is not uniform, and the difference in air temperature on the inlet and outlet sides of the evaporator may cause uneven temperature distribution on the evaporator surface. Usually, the temperature of the air flowing out of the evaporator is lower than the temperature of the air flowing in, so the surface temperature of the air outlet side of the evaporator will also be lower than that of the inlet side. This uneven temperature distribution will cause differences in frost at different locations on the evaporator surface, which may appear as thick frost in some areas and no frost in some areas.

[0003] In the prior art, the commonly used evaporator defrosting method is bypass hot gas defrosting, the principle of which is to send the high-temperature and high-pressure gas discharged from the compressor into the evaporator through a specific bypass pipeline, and use the sensible heat and latent heat of these gases to heat the evaporator surface, thereby melting the frost layer. However, defrosting by bypass hot gas has the following disadvantages: the distribution of hot gas on the evaporator surface may be uneven, causing the frost layer in some areas to melt faster, while the frost layer in other areas melts slower, thus affecting the defrosting effect; during the hot gas defrosting process, the compressor needs to discharge more high-temperature and high-pressure gas, which may increase the burden on the compressor and shorten its service life. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an automatic defrosting air source heat pump system to solve the problems of uneven defrosting of the evaporator and heavy burden on the compressor of the air source heat pump in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] An automatic defrosting air source heat pump system, comprising:

[0007] compressor;

[0008] a condenser, the condenser being connected to the compressor via a first pipeline;

[0009] A liquid storage tank, wherein the liquid storage tank is connected to the condenser through a second pipeline;

[0010] A filter, wherein the filter is connected to the liquid storage tank through a third pipe;

[0011] an evaporator, wherein the evaporator is connected to the filter through a fourth pipeline, and the fourth pipeline is connected to an expansion valve; the evaporator is connected to the compressor through a fifth pipeline, and the fifth pipeline is connected to a gas-liquid separator;

[0012] The evaporator comprises a bracket, a heat exchange coil, heat conducting fins and a heat dissipation fan;

[0013] The heat exchange coil is connected to the bracket in a coiled manner, and the two ends of the heat exchange coil are respectively connected to the fourth pipe and the fifth pipe; the heat conduction fin array is connected to the heat exchange coil in a distributed manner; the cooling fan is connected to the bracket, and the cooling fan is located on the opposite side of the heat exchange coil in the X direction, and the wind direction of the cooling fan is in the X direction;

[0014] A defrost assembly, the defrost assembly comprising a YZ biaxial movable module, a movable seat and a defrost mechanism; the YZ biaxial movable module is located on the X-direction side of the heat exchange coil, the movable seat is connected to the YZ biaxial movable module, the defrost mechanism is connected to the movable seat, the defrost mechanism comprises a accommodating chamber, the X-direction side and the opposite side of the X-direction of the accommodating chamber are provided with openings, a spiral heating tube and a defrost fan are sequentially arranged in the accommodating chamber along the X-direction, the wind direction of the defrost fan is opposite to the X-direction, the first pipeline is provided with a first three-way valve, one end of the spiral heating tube is connected to the first three-way valve through a first hose; the second pipeline is connected to a second three-way valve, the other end of the spiral heating tube is connected to the second three-way valve through a second hose; the defrost mechanism also comprises a camera, the camera faces the opposite side of the X-direction;

[0015] A defrost control device, wherein the defrost control device is electrically connected to a camera, a YZ two-axis moving component, a defrost fan, a first three-way valve and a second three-way valve respectively; the defrost control device comprises an image computing and recognition module and a control module, wherein the image computing and recognition module is used to determine whether there is frost in a target area according to image information of the thermal fins acquired by the camera, and the control module is used to control the YZ two-axis moving component to drive the moving seat to move, so that the camera acquires image information of various directions on the thermal fins during the movement, and if the image computing and recognition module determines that there is frost, the opening of the first three-way valve and the second three-way valve is controlled and adjusted so that one tenth to one fifteenth of the refrigerant flows through the spiral heating tube, and the defrost fan is controlled to be turned on.

[0016] Further, in the above automatic defrosting air source heat pump system, the YZ biaxial moving component comprises:

[0017] A Y-axis screw guide assembly connected to the bracket;

[0018] A Y-direction sliding seat, wherein the Y-direction sliding seat is connected to a Y-direction lead screw guide rail assembly;

[0019] A Z-direction screw guide assembly, wherein the Z-direction screw guide assembly is connected to a Y-direction sliding seat;

[0020] The moving seat is connected to the Z-direction screw guide rail assembly.

[0021] Furthermore, in the above-mentioned automatic defrosting air source heat pump system, the Z-direction screw guide rail assembly includes a Z-direction screw body; the Z-direction screw guide rail assembly is connected to an air guide rod arranged along the Z direction, and the X-direction reverse surface of the air guide rod is provided with a conical air guide surface, and the air guide rod is located on the X-direction reverse side of the Z-direction screw body.

[0022] Furthermore, in the above-mentioned automatic defrost air source heat pump system, the lens of the camera is located above the opening on the X-direction opposite side of the accommodating cavity of the defrost mechanism, and an upwardly inclined wind guide plate is provided close to the upper end of the opening on the X-direction opposite side of the accommodating cavity of the defrost mechanism, for guiding one tenth to one fifteenth of the airflow generated by the defrost fan to the lens of the camera.

[0023] Furthermore, in the above-mentioned automatic defrosting air source heat pump system, the axial direction of the spiral heating tube is the X direction.

[0024] The beneficial effects of the present invention are as follows: by arranging a defrost assembly on the windward side of the evaporator relative to the heat dissipation fan, a structure in which the moving seat is driven to move by a YZ dual-axis moving module, and using the first pipe and the second pipe in the original system pipeline of the air source heat pump to respectively arrange three-way valves, a small part of the high-temperature and high-pressure refrigerant after the action of the compressor is guided to the spiral heating tube, and since the X-direction projection area of ​​the spiral heating tube is small, it can be spirally stacked, and when the airflow is blown toward the heat transfer fins by the defrost fan, the airflow can be fully heated by the spiral heating tube, and the heat transfer fins can be defrosted efficiently at a fixed point; since the frosted part of the evaporator is usually on the windward side of the heat dissipation fan, and the frosted part is not uniform, the present invention can specifically heat and defrost the windward side of the heat dissipation fan of the evaporator, and since the refrigerant flowing through the spiral heating tube is only a very small part of the original air source heat pump system, the defrosting process does not affect the normal use of the air source heat pump, and does not need to increase the load of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an automatic defrosting air source heat pump system according to a specific embodiment of the present invention;

[0026] Figure 2 It is a schematic structural diagram from a first perspective of an evaporator and a defrost component of an automatic defrosting air source heat pump system according to a specific embodiment of the present invention;

[0027] Figure 3 A second perspective structural schematic diagram of an evaporator and a defrost assembly of an automatic defrosting air source heat pump system according to a specific embodiment of the present invention;

[0028] Figure 4 for Figure 3 A magnified view of part A;

[0029] Figure 5 It is a reverse view of the evaporator and the defrost assembly of an automatic defrosting air source heat pump system in the X direction according to a specific embodiment of the present invention;

[0030] Figure 6 for Figure 5 BB cross-section diagram;

[0031] Figure 7 for Figure 5 CC cross-section diagram;

[0032] Figure 8 for Figure 7 A magnified view of the D portion;

[0033] Description of labels:

[0034] 1. Compressor;

[0035] 2. condenser; 21. first pipeline; 22. first three-way valve; 23. first hose;

[0036] 3. Liquid storage tank; 31. Second pipeline; 32. Second three-way valve; 33. Second hose;

[0037] 4. Filter; 41. Third pipeline;

[0038] 5. Evaporator; 51. Fourth pipeline; 511. Expansion valve; 52. Bracket; 53. Heat exchange coil; 54. Heat conducting fins; 55. Cooling fan;

[0039] 6. Fifth pipeline; 61. Gas-liquid separator;

[0040] 7. Defrost assembly; 71. YZ dual-axis moving module; 711. Y-axis screw guide rail assembly; 712. Y-axis sliding seat; 713. Z-axis screw guide rail assembly; 714. Z-axis screw body; 715. Wind guide rod; 716. Conical wind guide surface; 72. Moving seat; 73. Defrost mechanism; 731. Accommodating cavity; 7311. Wind guide plate; 732. Spiral heating tube; 733. Defrost fan; 734. Camera. DETAILED DESCRIPTION

[0041] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0042] Please refer to Figures 1 to 8 The specific embodiment of the present invention relates to an automatic defrosting air source heat pump system, comprising:

[0043] Compressor 1;

[0044] A condenser 2, wherein the condenser 2 is connected to the compressor 1 through a first pipe 21;

[0045] A liquid storage tank 3, wherein the liquid storage tank 3 is connected to the condenser 2 via a second pipe 31;

[0046] A filter 4, wherein the filter 4 is connected to the liquid storage tank 3 through a third pipe 41;

[0047] an evaporator 5, wherein the evaporator 5 is connected to the filter 4 via a fourth pipeline 51, and the fourth pipeline 51 is connected to an expansion valve 511; the evaporator 5 is connected to the compressor 1 via a fifth pipeline 6, and the fifth pipeline 6 is connected to a gas-liquid separator 61;

[0048] The evaporator 5 includes a bracket 52, a heat exchange coil 53, a heat conducting fin 54 and a heat dissipation fan 55;

[0049] The heat exchange coil 53 is connected to the bracket 52 in a coiled manner, and the two ends of the heat exchange coil 53 are respectively connected to the fourth pipe 51 and the fifth pipe 6; the heat conduction fins 54 are connected to the heat exchange coil 53 in an array distribution manner; the cooling fan 55 is connected to the bracket 52, and the cooling fan 55 is located on the opposite side of the heat exchange coil 53 in the X direction, and the wind direction of the cooling fan 55 is the X direction;

[0050] The defrost assembly 7 includes a YZ biaxial movable module 71, a movable seat 72 and a defrost mechanism 73; the YZ biaxial movable module 71 is located on the X-direction side of the heat exchange coil 53, the movable seat 72 is connected to the YZ biaxial movable module 71, the defrost mechanism 73 is connected to the movable seat 72, the defrost mechanism 73 includes a receiving cavity 731, the X-direction side and the reverse side of the X-direction of the receiving cavity 731 are provided with openings, and the spiral heating tubes are arranged in sequence along the X-direction in the receiving cavity 731 732 and a defrost fan 733, the wind direction of the defrost fan 733 is opposite to the X direction, the first pipeline 21 is provided with a first three-way valve 22, one end of the spiral heating tube 732 is connected to the first three-way valve 22 through a first hose 23; the second pipeline 31 is connected to a second three-way valve 32, the other end of the spiral heating tube 732 is connected to the second three-way valve 32 through a second hose 33; the defrost mechanism 73 also includes a camera 734, and the camera 734 faces the opposite side of the X direction;

[0051] A defrost control device, wherein the defrost control device is electrically connected to a camera 734, a YZ two-axis moving assembly, a defrost fan 733, a first three-way valve 22 and a second three-way valve 32 respectively; the defrost control device comprises an image computing and recognition module and a control module, wherein the image computing and recognition module is used to determine whether there is frost in a target area according to image information of the thermal fins 54 acquired by the camera 734, and the control module is used to control the YZ two-axis moving assembly to drive the moving seat 72 to move, so that the camera 734 acquires image information of various directions on the thermal fins 54 during the movement, and if the image computing and recognition module determines that there is frost, the opening of the first three-way valve 22 and the second three-way valve 32 are controlled to be adjusted so that one tenth to one fifteenth of the refrigerant flows through the spiral heating tube 732, and the defrost fan 733 is controlled to be turned on.

[0052] The working process of the above implementation method is as follows:

[0053] During the operation of the air source heat pump system, the YZ two-axis moving component can be controlled to drive the moving seat 72 to move at a certain rhythm, for example, move 2 cm, stop, and obtain image information of the thermal fins 54 in the target area through the camera 734. According to the image information of the thermal fins 54, it is determined whether there is frost and the degree of frost. According to the degree of frost, the opening and duration of the first three-way valve 22 and the second three-way valve 32, as well as the opening time of the defrost fan 733 are controlled. After defrosting is completed, the camera 734 obtains the image information of the thermal fins 54 in the target area again to determine the degree of frost. If the degree of frost is lower than the threshold, the YZ two-axis moving component is continued to be controlled to drive the moving seat 72 to move 2 cm, and the degree of frost of the thermal fins 54 in the next area is determined, and so on, until the camera 734 traverses all areas of the thermal fins 54, and an automatic defrosting operation is completed.

[0054] In the above implementation, the image calculation and recognition module can judge the degree of frost corresponding to the image information of the thermal fins 54 in the target area through the CNN (convolutional neural network) algorithm; in the sample training stage, different degrees of frost can be set on the thermal fins 54 manually, and the image information of different degrees of frost on the thermal fins 54 can be obtained by the camera 734. Part of these image information is used as training samples, and the corresponding frost degree value is used as mapping through manual judgment, and the other part of the image information is used as verification samples. The CNN model obtained through training can be used for the above-mentioned judgment of the degree of frost based on the image information of the thermal fins 54; that is, the result of the degree of frost can be automatically output by obtaining the thermal image information of the target area.

[0055] It is an existing technology to use CNN for image recognition to obtain corresponding results. Therefore, the present invention does not elaborate on the specific training process of the CNN model, such as the distribution of hidden layers and the selection of loss functions and activation functions. The improvement of the present invention lies in the application of the CNN training model in the judgment of the degree of frost on the thermal fins 54.

[0056] In the above embodiment, by setting a defrost assembly 7 on the windward side of the evaporator 5 relative to the heat dissipation fan 55, the YZ biaxial moving module 71 drives the moving seat 72 to move, and the first pipe 21 and the second pipe 31 in the original system pipeline of the air source heat pump are respectively provided with three-way valves, so that a small part of the high-temperature and high-pressure refrigerant after the action of the compressor 1 is guided to the spiral heating tube 732. Since the X-axis projection area of ​​the spiral heating tube 732 is small, it can be spirally stacked. When the defrost fan 733 blows the airflow to the heat conduction fins 54, the airflow can be fully heated by the spiral heating tube 732, and the heat conduction fins 54 are defrosted efficiently at a fixed point. Since the frosting part of the evaporator 5 is usually on the windward side of the heat dissipation fan 55, and the frosting part is not uniform, the present invention can heat and defrost the windward side of the heat dissipation fan 55 of the evaporator 5 in a targeted manner. Since the refrigerant flowing through the spiral heating tube 732 is only a small part of the original air source heat pump system, the defrosting process does not affect the normal use of the air source heat pump, and does not need to increase the load of the compressor 1.

[0057] As a preferred embodiment, the YZ biaxial moving assembly comprises:

[0058] A Y-axis screw guide assembly 711 connected to the bracket 52;

[0059] A Y-direction sliding seat 712, wherein the Y-direction sliding seat 712 is connected to the Y-direction screw guide assembly 711;

[0060] A Z-direction screw guide assembly 713, wherein the Z-direction screw guide assembly 713 is connected to the Y-direction sliding seat 712;

[0061] The moving seat 72 is connected to the Z-axis screw guide rail assembly 713 .

[0062] As a preferred embodiment, the Z-direction screw guide rail assembly 713 includes a Z-direction screw body 714; the Z-direction screw guide rail assembly 713 is connected to a wind guide rod 715 arranged along the Z direction, and the X-direction reverse surface of the wind guide rod 715 is provided with a conical wind guide surface 716, and the wind guide rod 715 is located on the X-direction reverse side of the Z-direction screw body 714.

[0063] In the above embodiment, since the defrost assembly 7 is arranged on the windward side of the evaporator 5, when the defrost mechanism 73 is working, the Z-direction screw rod body 714 will be affected by the cold wind from the cooling fan 55 and will have the risk of frosting. The conical air guide surface 716 of the air guide rod 715 can guide the cold air blowing toward the Z-direction screw rod body 714 to the side, thereby preventing the Z-direction screw rod body 714 from frosting and affecting the normal movement of the movable seat 72.

[0064] As a preferred embodiment, the lens of the camera 734 is located above the opening on the opposite side of the X-direction of the accommodating cavity 731 of the defrost mechanism 73, and an upwardly inclined wind guide plate 731 is provided close to the upper end of the opening on the opposite side of the X-direction of the accommodating cavity 731 of the defrost mechanism 73, for guiding one tenth to one fifteenth of the airflow generated by the defrost fan 733 to the lens of the camera 734.

[0065] In the above embodiment, since the lens of the camera 734 is always facing the windward side of the cooling fan 55, it is easy to cause frost on the lens of the camera 734 after working for a long time, affecting the clarity of the image information obtained therefrom. By providing the wind guide plate 7311, a part of the hot air flow generated by the defrost fan 733 can be guided to the lens of the camera 734 to avoid frosting of the lens.

[0066] As a preferred embodiment, the axial direction of the spiral heating tube 732 is the X direction. The spiral heating tube 732 has multiple layers in the X direction, and when the airflow generated by the defrosting fan 733 passes through the accommodating cavity 731 , the defrosting efficiency of the heat conducting fins 54 of the evaporator 5 can be further improved.

[0067] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic defrosting air source heat pump system, characterized in that: include: compressor; a condenser, the condenser being connected to the compressor via a first pipeline; A liquid storage tank, wherein the liquid storage tank is connected to the condenser through a second pipeline; A filter, wherein the filter is connected to the liquid storage tank through a third pipe; an evaporator, wherein the evaporator is connected to the filter through a fourth pipeline, and the fourth pipeline is connected to an expansion valve; the evaporator is connected to the compressor through a fifth pipeline, and the fifth pipeline is connected to a gas-liquid separator; The evaporator comprises a bracket, a heat exchange coil, heat conducting fins and a heat dissipation fan; The heat exchange coil is connected to the bracket in a coiled manner, and the two ends of the heat exchange coil are respectively connected to the fourth pipe and the fifth pipe; the heat conduction fin array is connected to the heat exchange coil in a distributed manner; the cooling fan is connected to the bracket, and the cooling fan is located on the opposite side of the heat exchange coil in the X direction, and the wind direction of the cooling fan is in the X direction; A defrost assembly, the defrost assembly comprising a YZ biaxial movable module, a movable seat and a defrost mechanism; the YZ biaxial movable module is located on the X-direction side of the heat exchange coil, the movable seat is connected to the YZ biaxial movable module, the defrost mechanism is connected to the movable seat, the defrost mechanism comprises a accommodating chamber, the X-direction side and the opposite side of the X-direction of the accommodating chamber are provided with openings, a spiral heating tube and a defrost fan are sequentially arranged in the accommodating chamber along the X-direction, the wind direction of the defrost fan is opposite to the X-direction, the first pipeline is provided with a first three-way valve, one end of the spiral heating tube is connected to the first three-way valve through a first hose; the second pipeline is connected to a second three-way valve, the other end of the spiral heating tube is connected to the second three-way valve through a second hose; the defrost mechanism also comprises a camera, the camera faces the opposite side of the X-direction; A defrost control device, wherein the defrost control device is electrically connected to a camera, a YZ two-axis moving component, a defrost fan, a first three-way valve and a second three-way valve respectively; the defrost control device comprises an image computing and recognition module and a control module, wherein the image computing and recognition module is used to determine whether there is frost in a target area according to image information of the thermal fins acquired by the camera, and the control module is used to control the YZ two-axis moving component to drive the moving seat to move, so that the camera acquires image information of various directions on the thermal fins during the movement, and if the image computing and recognition module determines that there is frost, the opening of the first three-way valve and the second three-way valve is controlled and adjusted so that one tenth to one fifteenth of the refrigerant flows through the spiral heating tube, and the defrost fan is controlled to be turned on.

2. The automatic defrosting air source heat pump system according to claim 1, characterized in that: The YZ dual-axis moving assembly includes: A Y-axis screw guide assembly connected to the bracket; A Y-direction sliding seat, wherein the Y-direction sliding seat is connected to a Y-direction lead screw guide rail assembly; A Z-direction screw guide assembly, wherein the Z-direction screw guide assembly is connected to a Y-direction sliding seat; The moving seat is connected to the Z-direction screw guide rail assembly.

3. The automatic defrosting air source heat pump system according to claim 2, characterized in that: The Z-direction screw guide rail assembly includes a Z-direction screw body; the Z-direction screw guide rail assembly is connected to a wind guide rod arranged along the Z direction, the X-direction reverse surface of the wind guide rod is provided with a conical wind guide surface, and the wind guide rod is located on the X-direction reverse side of the Z-direction screw body.

4. The automatic defrosting air source heat pump system according to claim 1, characterized in that: The lens of the camera is located above the opening on the opposite side of the X-direction of the accommodating cavity of the defrost mechanism. An upwardly inclined wind guide plate is provided close to the upper end of the opening on the opposite side of the X-direction of the accommodating cavity of the defrost mechanism for guiding one tenth to one fifteenth of the airflow generated by the defrost fan to the lens of the camera.

5. The automatic defrosting air source heat pump system according to claim 1, characterized in that: The axial direction of the spiral heating tube is the X direction.

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