Defrosting device for air source heat pump unit

Abstract

The invention belongs to the technical field of air source heat pumps, and particularly relates to a defrosting device for an air source heat pump unit, which comprises a heat pump unit body, a movable seat is arranged on one side of the heat pump unit body, and two movable rollers are rotatably connected below the movable seat; and the defrosting mechanism is used for increasing the air speed of hot air in the defrosting process and enabling the hot air to impact the surfaces of the fins in the inclined direction, the defrosting mechanism comprises a fixed guide rail fixedly connected to the upper portion of the movable base, and a sliding block is slidably connected into the fixed guide rail in the vertical direction. By arranging the defrosting mechanism, in the defrosting process, hot air in the rotating process can be obliquely sprayed out from the ventilation holes and impacts on the surfaces of the fins, the obliquely sprayed hot air can increase the force impacting on the surfaces of the fins under the action of centrifugal force, meanwhile, the oblique hot air can achieve the effect similar to'shoveling ', and the defrosting efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air source heat pumps, and particularly relates to a defrosting device for an air source heat pump unit. Background Art

[0002] An air source heat pump is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source, air, to a high-level heat source. It has the characteristics of energy conservation and environmental protection, can utilize natural heat energy, reduce resource consumption and greenhouse gas emissions. It is not only safe and reliable, without open flames and soot, avoiding potential hazards such as gas leakage, but also convenient for installation and use. The system combines cold and heat sources, eliminating the need for a dedicated refrigeration machine room and boiler room. It can be placed on the roof or ground, without occupying effective usable area, and has been widely used in the fields of residential heating, heating of large buildings or building complexes, waste heat recovery, drying technology, etc.

[0003] During the actual operation of an air source heat pump, the surface of the fin heat exchanger is extremely prone to frosting due to contact with water vapor in the air in a low-temperature environment. The frosting phenomenon will significantly increase the air flow resistance, reduce the heat transfer efficiency of the heat exchanger, lead to a significant decline in the heating performance of the heat pump unit, and even cause the unit to malfunction. Therefore, a defrosting device is required to defrost the heat pump unit regularly during use.

[0004] However, during the use of existing defrosting devices, the following technical problems still exist: The traditional hot air defrosting method uses a vertical air injection design, and the hot air can only impact the fin surface in the vertical direction. This single air injection angle results in insufficient impact force of the hot air on a large area of frost layer. Especially for a frost layer with a hard texture or tight adhesion, it is difficult to quickly make it fall off. To achieve an ideal defrosting effect, it is often necessary to continuously increase the heating power or extend the defrosting time, which not only increases energy consumption but may also damage the electrical components inside the heat pump unit due to excessive local temperature, affecting the stability and service life of the equipment; Existing defrosting devices lack the ability to sense the degree of frosting in real time and adjust adaptively. Under different environmental conditions, the frosting thickness and density of the fins vary significantly, but traditional devices usually use a fixed heating power and air volume for defrosting. When the frosting is light, the excessive heating power will cause energy waste, while when the frosting is severe, the fixed heating power may result in insufficient heat supply, causing incomplete defrosting and requiring repeated defrosting, further reducing the working efficiency of the unit. Summary of the Invention

[0005] The purpose of the present invention is to address the problems raised in the above background art, and provide a defrosting device for an air source heat pump unit that can increase the impact force of hot air on the fin surface, and play a "shoveling" effect during defrosting, improving the defrosting efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A defrosting device for an air source heat pump unit, comprising: The heat pump unit body, a moving seat is provided on one side of the heat pump unit body, and two moving rollers are rotatably connected below the moving seat; A defrosting mechanism for increasing the wind speed of hot air during defrosting and simultaneously making the hot air impact the fin surface obliquely. The defrosting mechanism includes a fixed guide rail fixedly connected above the moving seat. A slider is slidably connected in the fixed guide rail along the vertical direction. A fixed rod is fixedly connected to a side wall of the slider away from the fixed guide rail. A hollow rotating cylinder is sealingly rotatably sleeved on the fixed rod. A plurality of ventilation holes are arranged on the circumferential side wall of the hollow rotating cylinder in a circumferentially arrayed manner. An annular channel is fixedly communicated with one end of the hollow rotating cylinder away from the slider. A driving gear is fixedly connected to the circumferential side wall of the annular channel. A driving rack meshing with the driving gear is fixedly connected to one side of the moving seat; A wind speed sensor for detecting the wind speed uniformity around the fins is provided above the moving seat; An adjustable heating mechanism for adjusting the heating effect of hot air according to the frosting degree.

[0007] Preferably, an arc-shaped baffle is fixedly connected to a portion of the fixed rod extending into the hollow rotating cylinder, and the arc-shaped baffle is used to block the ventilation holes on one side of the fins.

[0008] Preferably, a threaded rod is rotatably connected between the upper and lower inner walls of the fixed guide rail. The slider is threadedly connected to the threaded rod. A driving motor for driving the threaded rod is fixedly connected below the moving seat.

[0009] Preferably, the adjustable heating mechanism includes an extension block fixedly connected to the inner wall of the hollow rotating cylinder. A spiral heating rod is fixedly connected to the extension block. A liquid storage cavity is opened in the fixed rod. A piston block is sealingly slidably connected in the liquid storage cavity. An electric push rod is fixedly connected to one inner wall of the liquid storage cavity. The output end of the electric push rod is fixedly connected to the piston block. A moving sleeve is sealingly slidably connected to one end of the fixed rod close to the spiral heating rod. The liquid storage cavity is internally communicated with the moving sleeve. A heat insulation sleeve is fixedly connected to the moving sleeve through a connecting block. The heat insulation sleeve covers the circumferential side of the spiral heating rod. A PLC controller is provided at the upper end of the moving seat. The wind speed sensor adjusts the telescopic length of the electric push rod according to the PLC controller.

[0010] Preferably, a first liquid storage space is formed between the space on the left side of the piston block in the liquid storage cavity and the inside of the moving sleeve, and the first liquid storage space is filled with hydraulic oil.

[0011] Preferably, an adjustable ventilation mechanism is provided on the side of the hollow rotating cylinder away from the heat pump unit body, which is used to continuously pump in external air during operation and discharge it through the ventilation holes on the hollow rotating cylinder. The adjustable ventilation mechanism includes two L-shaped support rods fixedly connected to the slider. Two symmetrically arranged air extraction plates are hermetically and slidably connected in the air extraction box. A limiting plate is fixedly connected to one side of the air extraction box. Two symmetrically arranged moving plates are slidably connected to the limiting plate in the vertical direction. A connecting rod is fixedly connected between each moving plate and the corresponding air extraction plate. A return spring is arranged between the two moving plates. A guiding inclined plate is provided on each moving plate, and the two guiding inclined plates move synchronously closer to or away from each other. An air guide pipe is fixedly communicated with the outer wall of one side of the air extraction box. The air guide pipe passes through the slider and the fixed rod and is communicated with the inside of the hollow rotating cylinder.

[0012] Preferably, an extension rod is fixedly connected to the side wall of the slider away from the fixed rod. An electric telescopic rod is fixedly connected to the extension rod. The output end of the electric telescopic rod is fixedly connected to a vertical rod. Two symmetrically arranged guiding rollers are rotatably connected to the vertical rod through a fixed shaft. The guiding rollers are in contact with and roll on the corresponding guiding inclined plate.

[0013] Preferably, a control mechanism is further provided inside the moving plate, which is used to adjust the discharge amount of hot air per unit time while the adjustable heating mechanism adjusts the heating effect of the hot air. The control mechanism includes a control cavity opened inside the moving plate. A piston plate is hermetically and slidably connected in the control cavity. A sliding groove is opened on the side wall of the moving plate. A transmission gear plate is slidably connected in the sliding groove. A push rod is fixedly connected between the piston plate and the transmission gear plate. The guiding inclined plate is hinged to the side wall of the moving plate through a hinge seat, and a transmission gear meshing with the transmission gear plate is fixedly connected to the rotating connection of the guiding inclined plate. A three-way pipe is arranged in the fixed rod. One end of the three-way pipe is communicated with the space on the right side of the piston block in the liquid storage cavity, and the other two ends are respectively communicated with the control cavities in the two moving plates.

[0014] Preferably, a second liquid storage space is formed among the space on the right side of the piston block in the liquid storage cavity, the three-way pipe and the two control cavities, and the second liquid storage space is filled with hydraulic oil.

[0015] Compared with the existing technology, the advantages of this defrosting device for the air source heat pump unit are as follows: In the present invention, by providing a defrosting mechanism, during the defrosting process, the driving motor is turned on to drive the hollow rotating cylinder to perform reciprocating vertical displacement, and at the same time drive the hollow rotating cylinder to rotate around the fixed rod. The ventilation holes on the circumferential side of the hollow rotating cylinder are arranged in a circular array, so that when rotating, the hot air can be ejected obliquely from the ventilation holes and impact on the surface of the fins. The obliquely ejected hot air can increase the impact force on the fin surface under the action of centrifugal force. At the same time, the obliquely directed hot air can achieve an effect similar to "scraping", improving the defrosting efficiency.

[0016] In the present invention, by providing an adjustable heating mechanism, during the defrosting process, the frosting degree on the fin surface can be detected by the wind speed sensor, and the defrosting effect of the hot air can be adaptively adjusted according to the frosting degree on the fin surface. When the frosting degree is relatively large, the heating degree of the spiral heating rod to the air is increased to improve the defrosting effect. When the frosting degree is relatively small, the heating degree to the air is reduced to avoid the problem of excessive air temperature on the circumferential side of the fins and prevent damage to the electrical components inside the heat pump unit body.

[0017] In the present invention, by providing a control mechanism, when the frosting is severe, the electric push rod shortens, the hydraulic oil on the right side of the piston block pushes the piston plate to move a greater distance, the guiding inclined plate rotates by a greater angle, the stroke of the air extraction plate increases, and the air volume pumped per unit time increases; conversely, when the frosting is relatively light, the air volume decreases, realizing the linkage effect of "higher air volume with higher heating power and lower air volume with lower heating power", further improving the defrosting energy efficiency. Description of the Drawings

[0018] Figure 1 is the three-dimensional structural schematic diagram of the present invention; Figure 2 is the partial structural schematic diagram above the moving seat in the present invention; Figure 3 is Figure 2 the enlarged view at A in Figure 4 is the partial structural schematic diagram of the adjustable ventilation mechanism in the present invention; Figure 5 is the partial structural schematic diagram of the adjustable ventilation mechanism from another angle in the present invention; Figure 6 is the cross-sectional structural schematic diagram at the moving plate in the present invention.

[0019] In the figure: 1. Heat pump unit body; 11. Moving seat; 12. Moving rollers; 2. Defrosting mechanism; 21. Fixed guide rail; 22. Slide block; 23. Fixed rod; 24. Hollow rotating cylinder; 25. Ventilation holes; 26. Annular channel; 27. Driving gear; 28. Driving rack; 3. Arc-shaped baffle; 4. Adjustable heating mechanism; 41. Extension block; 42. Spiral heating rod; 43. Liquid storage cavity; 44. Piston block; 45. Electric push rod; 46. Moving sleeve; 47. Heat insulation sleeve; 5. Adjustable ventilation mechanism; 51. L-shaped support rod; 52. Air extraction box; 53. Air extraction plate; 54. Limit plate; 55. Moving plate; 56. Connecting rod; 57. Return spring; 58. Guide inclined plate; 59. Air duct; 6. Extension rod; 61. Electric telescopic rod; 62. Vertical rod; 63. Guide roller; 7. Control mechanism; 71. Control cavity; 72. Piston plate; 73. Chute; 74. Transmission gear plate; 75. Push rod; 76. Transmission gear; 77. Three-way pipe. Specific implementation mode

[0020] The following embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0021] Embodiment: Refer to Figures 1 to 6 , a defrosting device for an air source heat pump unit, comprising: The heat pump unit body 1, a moving seat 11 is arranged on one side of the heat pump unit body 1, and two moving rollers 12 are rotatably connected below the moving seat 11; The moving seat 11 can move along the ground through the two moving rollers 12 below, driving the entire defrosting device to approach or move away from the heat pump unit body 1, realizing the adjustment of the defrosting position, being able to defrost the fins at different positions, and a locking brake pad is installed on the moving roller 12 for fixing the position of the moving seat 11 during the defrosting process to maintain the stability of the defrosting mechanism 2 during the defrosting process.

[0022] The defrosting mechanism 2, which is used to increase the wind speed of the hot air during the defrosting process and at the same time make the hot air impact on the fin surface in an oblique direction. The defrosting mechanism 2 includes a fixed guide rail 21 fixedly connected above the moving seat 11. A slider 22 is slidably connected in the fixed guide rail 21 along the vertical direction. A fixed rod 23 is fixedly connected to the side wall of the slider 22 away from the fixed guide rail 21. A hollow rotating cylinder 24 is hermetically rotatably sleeved on the fixed rod 23. A plurality of ventilation holes 25 are arranged in a circumferential array on the circumferential side wall of the hollow rotating cylinder 24. One end of the hollow rotating cylinder 24 away from the slider 22 is fixedly communicated with an annular channel 26. A driving gear 27 is fixedly connected to the circumferential side wall of the annular channel 26. A driving rack 28 meshing with the driving gear 27 is fixedly connected to one side of the moving seat 11; Specifically, a part of the fixed rod 23 extending into the hollow rotating cylinder 24 is fixedly connected with an arc-shaped baffle 3. The arc-shaped baffle 3 is used to block the ventilation holes 25 on one side of the fins, so that the hot air during the defrosting process impacts accurately on the fins, ensuring the defrosting effect.

[0023] Specifically, a threaded rod is rotatably connected between the upper and lower inner walls of the fixed guide rail 21. The slider 22 is threadedly connected to the threaded rod. A driving motor for driving the threaded rod is fixedly connected below the moving seat 11. During actual use, the threaded rod can be rotated by the motor, so that the slider 22 reciprocates vertically along the fixed guide rail 21 to achieve the defrosting work.

[0024] Aiming at the problem that the impact force of hot air on a large-area frost layer in the prior art is insufficient, resulting in poor defrosting effect, the present invention sets up a defrosting mechanism 2. During the defrosting process, the driving motor is turned on, and the slider 22 slides up and down along the threaded rod through threaded connection, thereby driving the fixed rod 23 and the hollow rotating cylinder 24 to perform reciprocating vertical displacement, so that the ventilation holes 25 are aligned with different positions of the fins, so as to defrost the fins from different heights. During this process, the driving gear 27 moves up and down along the driving rack 28, so that the driving gear 27 drives the hollow rotating cylinder 24 to rotate around the fixed rod 23. The ventilation holes 25 on the circumferential side of the hollow rotating cylinder 24 are arranged in a circumferential array, so that the hot air can be obliquely ejected from the ventilation holes 25 during rotation and impact on the surface of the fins. The obliquely ejected hot air can increase the impact force on the surface of the fins under the action of centrifugal force. At the same time, the obliquely ejected hot air can play a role similar to "scraping", which can make the large-area flat frost layer on the surface of the fins fall off and improve the defrosting efficiency.

[0025] A wind speed sensor for detecting the wind speed uniformity around the fins is provided above the moving seat 11; Specifically, the wind speed sensors (not labeled in the figure) are arranged in an array, with at least 3 groups (preferably 5 groups) evenly arranged along the height direction of the fins of the heat pump unit body 1, corresponding to the upper, middle, and lower regions of the fins respectively. Each group of sensors includes 2 wind speed probes arranged orthogonally (in the X-axis and Y-axis directions) for detecting the wind speed components in the vertical and horizontal directions on the surface of the fins. An L-shaped positioning bracket can be fixedly connected above the moving seat 11, and the end of the bracket is connected to the mounting seat of the wind speed sensor through a telescopic rod (such as an electric push rod or a spring telescopic rod). The telescopic rod is internally provided with a pressure sensor, which automatically retracts when the sensor probe touches the fins or obstacles to avoid collision damage, and keeps the distance between the sensor probe and the surface of the fins at 5-10 cm (which can be adjusted according to the fin size) to ensure that the detected data directly reflects the true air flow velocity around the fins.

[0026] The adjustable heating mechanism 4 is used to adjust the heating effect on the hot air according to the frosting degree. The adjustable heating mechanism 4 includes an extension block 41 fixedly connected to the inner wall of the hollow rotating cylinder 24. A spiral heating rod 42 is fixedly connected to the extension block 41. A liquid storage cavity 43 is formed inside the fixed rod 23. A piston block 44 is hermetically and slidably connected inside the liquid storage cavity 43. An electric push rod 45 is fixedly connected to one inner wall of the liquid storage cavity 43. The output end of the electric push rod 45 is fixedly connected to the piston block 44. A moving sleeve 46 is hermetically and slidably connected to one end of the fixed rod 23 close to the spiral heating rod 42. The liquid storage cavity 43 is internally connected to the inside of the moving sleeve 46. A heat insulation sleeve 47 is fixedly connected to the moving sleeve 46 through a connecting block. The heat insulation sleeve 47 covers the periphery of the spiral heating rod 42. A PLC controller is provided at the upper end of the moving seat 11. The wind speed sensor adjusts the telescopic length of the electric push rod 45 according to the PLC controller.

[0027] Specifically, a first liquid storage space is formed between the space on the left side of the piston block 44 in the liquid storage cavity 43 and the inside of the moving sleeve 46. The first liquid storage space is filled with hydraulic oil.

[0028] Aiming at the problem of the lack of real-time perception and adaptive adjustment ability for the frosting degree in the prior art, the present invention sets an adjustable heating mechanism 4. During the defrosting process, the frosting degree on the surface of the fins can be detected by the wind speed sensor. When the frosting degree is relatively large, when the air inside the heat pump unit body 1 is discharged, it is greatly hindered by the frost layer, resulting in a small wind force impacting on the wind speed sensor. When the frosting degree is relatively small, the hindrance by the frost layer is small, resulting in a large wind force impacting on the wind speed sensor. The wind speed sensor transmits the wind speed magnitude to the PLC controller through an electrical signal, thereby controlling the telescopic movement of the electric push rod 45 to achieve the heating effect on the air, and thus adaptively adjusting the defrosting effect of the hot air according to the frosting degree on the surface of the fins. When the frosting degree is relatively large, the electric push rod 45 contracts, so that the piston block 44 moves in the liquid storage cavity 43, pumping more hydraulic oil in the first liquid storage space into the liquid storage cavity 43. The moving sleeve 46 drives the heat insulation sleeve 47 to move, and the shielding degree of the spiral heating rod 42 is smaller, so that the heating degree of the spiral heating rod 42 on the air increases, improving the defrosting effect. When the frosting degree is relatively small, the electric push rod 45 extends, pumping more hydraulic oil in the first liquid storage space into the moving sleeve 46, making the shielding degree of the heat insulation sleeve 47 on the spiral heating rod 42 larger. Since the spiral heating rod 42 is in contact with the inner wall of the heat insulation sleeve 47, the shielded part cannot heat the air. At this time, the heating effect on the air can ensure the defrosting effect, avoid the problem of too high air temperature around the fins, avoid damaging the electrical components inside the heat pump unit body 1, and at the same time achieve the balance between energy saving and efficient defrosting.

[0029] On one side of the hollow rotating cylinder 24 away from the heat pump unit body 1, an adjustable ventilation mechanism 5 is provided, which is used to continuously pump in external air during operation and discharge it through the ventilation holes 25 on the hollow rotating cylinder 24. The adjustable ventilation mechanism 5 includes two L-shaped support rods 51 fixedly connected to the slider 22. Two L-shaped support rods 51 are fixedly connected with an air extraction box 52. Two symmetrically arranged air extraction plates 53 are hermetically and slidably connected in the air extraction box 52. One side of the air extraction box 52 is fixedly connected with a limiting plate 54. Two symmetrically arranged moving plates 55 are slidably connected to the limiting plate 54 in the vertical direction. A connecting rod 56 is fixedly connected between each moving plate 55 and the corresponding air extraction plate 53. A return spring 57 is arranged between the two moving plates 55. A guiding inclined plate 58 is arranged on each moving plate 55. The two guiding inclined plates 58 move synchronously closer to or away from each other. An air guide pipe 59 is fixedly communicated with the outer wall of one side of the air extraction box 52. The air guide pipe 59 passes through the slider 22 and the fixed rod 23 and is communicated with the inside of the hollow rotating cylinder 24.

[0030] Specifically, an extension rod 6 is fixedly connected to the side wall of the slider 22 away from the fixed rod 23. An electric telescopic rod 61 is fixedly connected to the extension rod 6. The output end of the electric telescopic rod 61 is fixedly connected with a vertical rod 62. Two symmetrically arranged guiding rollers 63 are rotatably connected to the vertical rod 62 through a fixed shaft. The guiding rollers 63 are in contact with and roll on the corresponding guiding inclined plate 58.

[0031] Specifically, check valve plates are arranged in the annular channel 26 and the ventilation holes 25 (here, due to the annular and strip-shaped shapes of the annular channel 26 and the ventilation holes 25 respectively, conventional check valves cannot be used), so that air can only enter the hollow rotating cylinder 24 from the annular channel 26 and can only be discharged through the ventilation holes 25, avoiding the influence on the effect of hot air impacting the fin surface caused by the backflow of air.

[0032] During actual use, the electric telescopic rod 61 on the extension rod 6 drives the vertical rod 62 to move left and right. The guiding rollers 63 roll along the surface of the guiding inclined plate 58, forcing the two guiding inclined plates 58 to approach or move away synchronously, driving the moving plates 55 to slide on the limiting plate 54. The moving plates 55 push and pull the air extraction plates 53 to reciprocate in the air extraction box 52 through the connecting rods 56, realizing the inhalation and discharge of air in the air extraction box 52. The inhaled external air enters the hollow rotating cylinder 24 through the annular channel 26, mixes with the hot air heated by the spiral heating rod 42, and is ejected through the ventilation holes 25. When the electric telescopic rod 61 retracts, the return spring 57 drives the two moving plates 55 to reset, driving the guiding inclined plates 58 and the air extraction plates 53 back to the initial position, completing a pumping cycle.

[0033] Inside the moving plate 55, a control mechanism 7 is further provided, which is used to adjust the discharge amount of hot air per unit time while the adjustable heating mechanism 4 adjusts the hot air heating effect. The control mechanism 7 includes a control cavity 71 opened inside the moving plate 55. A piston plate 72 is hermetically and slidably connected inside the control cavity 71. A chute 73 is opened on the side wall of the moving plate 55. A transmission rack 74 is slidably connected inside the chute 73. A push rod 75 is fixedly connected between the piston plate 72 and the transmission rack 74. The guiding inclined plate 58 is hinged to the side wall of the moving plate 55 through a hinge seat, and a transmission gear 76 meshing with the transmission rack 74 is fixedly connected to the rotation connection of the guiding inclined plate 58. A three-way pipe 77 is arranged inside the fixed rod 23. One end of the three-way pipe 77 is communicated with the space on the right side of the piston block 44 inside the liquid storage cavity 43, and the other two ends are respectively communicated with the control cavities 71 inside the two moving plates 55.

[0034] Specifically, a second liquid storage space is formed among the space on the right side of the piston block 44 inside the liquid storage cavity 43, the three-way pipe 77, and the two control cavities 71, and the second liquid storage space is filled with hydraulic oil.

[0035] It is worth mentioning that in the present invention, by setting the control mechanism 7, when the electric push rod 45 pushes the piston block 44 to move to the right, the hydraulic oil on the right side of the liquid storage cavity 43 enters the control cavity 71 through the three-way pipe 77, pushing the piston plate 72 to slide. The piston plate 72 drives the transmission rack 74 to slide inside the chute 73 through the push rod 75, meshing and driving the transmission gear 76 to rotate the guiding inclined plate 58, changing the rolling path of the guiding roller 63. When the frosting is serious, the electric push rod 45 shortens, the hydraulic oil on the right side of the piston block 44 pushes the piston plate 72 to move a greater distance, the rotation angle of the guiding inclined plate 58 increases, the stroke of the air extraction plate 53 increases, and the air pumping volume per unit time increases; on the contrary, when the frosting is lighter, the air volume decreases, realizing the linkage effect of "higher heating power means higher air volume and lower heating power means lower air volume", which can adaptively adjust the heating air volume while adaptively adjusting the heating effect, thereby further improving the defrosting energy efficiency.

[0036] The function principle of the present invention can be elaborated through the following operation modes: Before defrosting, the wind speed sensor continuously detects the wind speed around the fins. If the frosting is serious, the frost layer hinders the air flow, and the wind speed detected by the wind speed sensor is relatively low. The PLC controller controls the electric push rod 45 to contract, the piston block 44 moves to the left, the hydraulic oil in the first liquid storage space is pressed into the liquid storage cavity 43, pushing the moving sleeve 46 to drive the heat insulation sleeve 47 to retract, and the exposed length of the spiral heating rod 42 increases, and the heating power is increased. If the frosting is lighter and the wind speed is higher, the electric push rod 45 extends, and the length of the heat insulation sleeve 47 covering the spiral heating rod 42 increases, reducing the effective heating area and avoiding overheating; When the electric push rod 45 contracts (high heating power), the hydraulic oil on the right side of the piston block 44 enters the control chamber 71 through the three-way pipe 77, pushing the piston plate 72 and the transmission rack 74 to move. The transmission gear 76 drives the guide inclined plate 58 to rotate, increasing the rolling stroke of the guide roller 63. The reciprocating amplitude of the air extraction plate 53 increases, and the air pumping volume per unit time increases. When the electric push rod 45 extends (low heating power), the hydraulic oil flows back, the rotation angle of the guide inclined plate 58 decreases, the stroke of the air extraction plate 53 shortens, and the air volume automatically decreases; The drive motor starts, and the rotation of the threaded rod drives the slider 22 to slide up and down along the fixed guide rail 21. The hollow rotating cylinder 24 moves synchronously with the fixed rod 23. During this process, the drive gear 27 meshes with the drive rack 28, forcing the hollow rotating cylinder 24 to rotate around the fixed rod 23. Since the arc-shaped baffle 3 blocks the ventilation holes 25 on the non-fin side, only the ventilation holes 25 on the fin side continuously eject hot air during rotation, and the hot air impacts the fins at an oblique angle due to the centrifugal force, forming a "scraping" effect to accelerate the shedding of the frost layer; The electric telescopic rod 61 drives the guide roller 63 to move left and right, drives the moving plate 55 to slide through the guide inclined plate 58, and the air extraction plate 53 reciprocates in the air extraction box 52, pumping the outside air into the hollow rotating cylinder 24 through the air guide pipe 59 and discharging it through the ventilation holes 25, and realizing the defrosting work through the hot air.

[0037] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A defrosting device for an air source heat pump unit, characterized in that: include: A heat pump unit body (1), wherein a movable seat (11) is provided on one side of the heat pump unit body (1), and two movable rollers (12) are rotatably connected below the movable seat (11); A defrosting mechanism (2) is used to increase the wind speed of hot air during the defrosting process and simultaneously make the hot air impact the fin surface in an oblique direction, the defrosting mechanism (2) comprising a fixed guide rail (21) fixedly connected to the top of the movable seat (11), a slider (22) being slidably connected in the vertical direction in the fixed guide rail (21), a fixed rod (23) being fixedly connected to a side wall of the slider (22) away from the fixed guide rail (21), a hollow rotating cylinder (24) being sealingly rotatably sleeved on the fixed rod (23), a plurality of ventilation holes (25) distributed in a circumferential array being provided on the peripheral side wall of the hollow rotating cylinder (24), an annular channel (26) being fixedly connected to one end of the hollow rotating cylinder (24) away from the slider (22), a driving gear (27) being fixedly connected to the peripheral side wall of the annular channel (26), and a driving rack (28) meshing with the driving gear (27) being fixedly connected to one side of the movable seat (11); A wind speed sensor for detecting the uniformity of wind speed around the fin is provided above the movable seat (11); The adjustable heating mechanism (4) is used to adjust the heating effect of the hot air according to the degree of frost.

2. The defrosting device for an air source heat pump unit according to claim 1, characterized in that: The portion of the fixing rod (23) extending into the hollow drum (24) is fixedly connected to an arc-shaped baffle (3), and the arc-shaped baffle (3) is used to shield the ventilation holes (25) except on one side of the fins.

3. The defrosting device for an air source heat pump unit according to claim 1, characterized in that: A threaded rod is rotatably connected between the upper and lower inner walls of the fixed guide rail (21), the slider (22) is threadably connected to the threaded rod, and a drive motor for driving the threaded rod is fixedly connected below the movable seat (11).

4. The defrosting device for an air source heat pump unit according to claim 1, characterized in that: The adjustable heating mechanism (4) comprises an extension block (41) fixedly connected to the inner wall of the hollow drum (24), a spiral heating rod (42) fixedly connected to the extension block (41), a liquid storage chamber (43) is provided inside the fixed rod (23), a piston block (44) is sealingly and slidably connected inside the liquid storage chamber (43), an electric push rod (45) is fixedly connected to the inner wall of one side of the liquid storage chamber (43), an output end of the electric push rod (45) is fixedly connected to the piston block (44), and the A movable sleeve (46) is sealingly and slidably connected to an end of one side of the fixed rod (23) close to the spiral heating rod (42); the liquid storage chamber (43) is in communication with the interior of the movable sleeve (46); a heat insulating sleeve (47) is fixedly connected to the movable sleeve (46) via a connecting block; the heat insulating sleeve (47) is arranged on the circumference of the spiral heating rod (42); a PLC controller is arranged on the upper end of the movable seat (11); and the wind speed sensor adjusts the telescopic length of the electric push rod (45) according to the PLC controller.

5. The defrosting device for an air source heat pump unit according to claim 4, characterized in that: A first liquid storage space is formed between the space located on the left side of the piston block (44) in the liquid storage cavity (43) and the interior of the movable sleeve (46), and the first liquid storage space is filled with hydraulic oil.

6. The defrosting device for an air source heat pump unit according to claim 4, characterized in that: An adjustable ventilation mechanism (5) is provided on a side of the hollow drum (24) away from the heat pump unit body (1), for continuously pumping in outside air during operation and discharging it through the ventilation holes (25) on the hollow drum (24), the adjustable ventilation mechanism (5) comprising two L-shaped support rods (51) fixedly connected to the slider (22), an air extraction box (52) fixedly connected to the two L-shaped support rods (51), two symmetrically arranged air extraction plates (53) sealed and slidably connected inside the air extraction box (52), a limit plate (54) fixedly connected to one side of the air extraction box (52), the limit plate (54) ) are slidably connected in the vertical direction with two symmetrically arranged moving plates (55), each of the moving plates (55) is fixedly connected to the corresponding position of the air extraction plate (53) with a connecting rod (56), a return spring (57) is provided between the two moving plates (55), each of the moving plates (55) is provided with a guide inclined plate (58), and the two guide inclined plates (58) move synchronously towards or away from each other, and an air guide pipe (59) is fixedly connected to the outer wall of one side of the air extraction box (52), and the air guide pipe (59) passes through the slider (22), the fixed rod (23) and is connected to the inside of the hollow rotating cylinder (24).

7. The defrosting device for an air source heat pump unit according to claim 6, characterized in that: An extension rod (6) is fixedly connected to a side wall of the slider (22) away from the fixed rod (23); an electric telescopic rod (61) is fixedly connected to the extension rod (6); an output end of the electric telescopic rod (61) is fixedly connected to a vertical rod (62); two symmetrically arranged guide rollers (63) are rotatably connected to the vertical rod (62) via a fixed axis; the guide rollers (63) roll in contact with guide inclined plates (58) at corresponding positions.

8. The defrosting device for an air source heat pump unit according to claim 6, characterized in that: A control mechanism (7) is further provided inside the movable plate (55) for adjusting the amount of hot air discharged per unit time while the adjustable heating mechanism (4) adjusts the heating effect of the hot air. The control mechanism (7) comprises a control chamber (71) provided inside the movable plate (55). A piston plate (72) is sealingly and slidably connected inside the control chamber (71). A sliding groove (73) is provided on the side wall of the movable plate (55). A transmission tooth plate (74) is slidably connected inside the sliding groove (73). The piston plate (72) and the transmission tooth plate are in a sealed and slidable manner. A push rod (75) is fixedly connected between the guide inclined plate (58) and the movable plate (74); the guide inclined plate (58) is hinged to the side wall of the movable plate (55) through a hinge seat; and a transmission gear (76) meshing with the transmission gear plate (74) is fixedly connected to the rotation connection of the guide inclined plate (58); a three-way pipe (77) is provided in the fixed rod (23); one end of the three-way pipe (77) is communicated with the space located on the right side of the piston block (44) in the liquid storage chamber (43), and the other two ends are respectively communicated with the control chambers (71) in the two movable plates (55).

9. The defrosting device for an air source heat pump unit according to claim 8, characterized in that: A second liquid storage space is formed between the space in the liquid storage chamber (43) located on the right side of the piston block (44), the three-way pipe (77), and the two control chambers (71), and the second liquid storage space is filled with hydraulic oil.

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