Air source heat pump unit with defrosting structure

Abstract

This utility model discloses an air source heat pump unit with a defrosting structure, including a body. An outdoor heat exchanger is fixedly installed inside the body. The lifting and blowing device includes a bracket, a motor, a fan, an electric heating element, a fixed cylinder, and an electric push rod A. A motor is fixedly installed between two U-shaped brackets. A fan is fixedly installed at the top output end of the motor. A disc-shaped electric heating element is fixed on the bracket. The fixed cylinder is fixed to the bottom surface of the top plate. The two ends of the bracket are vertically slidably connected along the inside of the fixed cylinder. An electric push rod A is fixed at the center of the bottom surface of the body. The top output end of the electric push rod A is fixed to the motor. This utility model uses the motor to reverse the direction to blow air towards the electric heating element and into the body. The electric push rod A drives the fan to descend, causing heat circulation inside the body and enabling the outdoor heat exchanger fins to defrost quickly.

Description

Technical Field

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

[0002] An air source heat pump unit is an energy-saving device that extracts heat from the air using the reverse Carnot cycle principle. It uses a compressor to drive the refrigerant circulation, thereby transferring heat from a low-temperature heat source to a high-temperature heat source.

[0003] Outdoor heat exchangers need to be at a lower temperature than the outdoor air to absorb heat. This means the surface temperature of the outdoor heat exchanger is often at or below freezing. When humid air with a temperature below the dew point and below 0°C flows through the cold outdoor heat exchanger, the water vapor in the air first condenses into water droplets on the coil surface. Because the coil surface temperature is below 0°C, these condensed water droplets quickly freeze into frost. Thick frost can clog the gaps between the fins of the outdoor heat exchanger, hindering airflow and significantly reducing air volume. This severely impedes heat transfer from the air to the outdoor heat exchanger, requiring the compressor to work harder to maintain the heat demand, leading to increased power consumption. If not addressed promptly, severe frost buildup can trigger high-pressure or low-pressure protection, causing the machine to stop operating. Utility Model Content

[0004] The purpose of this utility model is to provide an air source heat pump unit with a defrosting structure to solve the problems of frost forming between the fins of the outdoor heat exchanger, which hinders the transfer of heat from the air to the outdoor heat exchanger for heat absorption.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An air source heat pump unit with a defrosting structure includes a rectangular body. A U-shaped outdoor heat exchanger is fixedly installed inside the body. Three sides of the body have identical vent plates, and a sealing plate is fixedly installed on the other side. A top plate is fixedly installed on the top of the body. An electrical box is fixed to the body inside the sealing plate, housing a PLC control system. A lifting fan is installed at the center of the body. The outdoor heat exchanger is placed on three sides near the three vent plates. The lifting fan includes a bracket, a motor, a fan, an electric heating element, a fixed cylinder, and an electric push rod A. A motor is fixedly installed between two U-shaped brackets. A fan is fixedly installed at the top output end of the motor. A disc-shaped electric heating element is fixed to the bracket. The fixed cylinder is fixed to the bottom surface of the top plate. The two ends of the bracket are vertically slidably connected within the fixed cylinder. An electric push rod A is fixed to the center of the bottom surface of the body, and the top output end of the electric push rod A is fixed to the motor.

[0007] Preferably, the ventilated plate includes an outer plate, guide strips, an inner plate, vent holes, pull rods, roller seats, and rollers. The outer plate is fixed to the machine body by bolts. Vertical guide strips are fixed to both ends of the inner side of the outer plate. The inner plate is placed between the guide strips and the outer plate. The inner plate is slidably connected up and down along the inner side of the guide strips. The outer plate and the inner plate have the same vent holes evenly distributed. The vent holes are staggered in the vertical and horizontal directions. Two pull rods are bolted to the top of the inner plate. A roller seat is fixed to the top of the pull rod. A roller is mounted on one side of the roller seat via a shaft.

[0008] Preferably, a synchronous lifting device is installed on the top plate to synchronously lift the three inner plates and close the vent holes. The synchronous lifting device includes an air vent ring, a bearing, a gear ring, a guide plate, a rack, a brake block, a low surface, a high surface, and an inclined surface. An air vent ring is fixed at the center of the top of the top plate. The top and bottom of the air vent ring are connected and located directly above the fan. A bearing is interference-fitted to the outside of the air vent ring. The gear ring is interference-fitted to the outside of the bearing. An L-shaped guide plate is fixed on the top plate directly above the three vent plates. The rack meshes with the gear ring and slides along the inside of the guide plate. Brake blocks are fixed at both ends of the rack. The brake blocks are provided with a low surface and a high surface that are horizontal and at different heights. The low surface and the high surface are connected by an inclined surface. The roller rolls on the low surface, the high surface, and the inclined surface.

[0009] Preferably, a starting device is installed on the top plate. The starting device includes an electric push rod B, a hinge seat, and a fixed shaft. The electric push rod B is connected to the electrical box wires. The electric push rod B is hinged to the hinge seat. The hinge seat is bolted to the top plate, allowing the electric push rod B to rotate horizontally through the hinge seat. The fixed shaft is vertically fixed to the top surface of the gear ring. The output end of the electric push rod B is hinged to the fixed shaft, allowing the output end of the electric push rod B to rotate horizontally along the fixed shaft.

[0010] Preferably, a temperature sensor is fixedly installed on the outside of the unit body, the detection end of the temperature sensor is in contact with the fins of the outdoor heat exchanger, and the temperature sensor is connected to the electrical box wires.

[0011] Preferably, the base plate of the machine body is provided with a water outlet.

[0012] Preferably, a protective cover is bolted to the top of the air vent ring.

[0013] This utility model has the following beneficial effects:

[0014] 1. By reversing the motor, the airflow is directed towards the electric heating element and enters the machine body. The electric push rod A drives the fan to descend, causing heat circulation inside the machine body and allowing the outdoor heat exchanger fins to defrost as quickly as possible.

[0015] 2. The temperature sensor detects the temperature of the fins and determines whether the machine body needs to defrost. Combined with the automatic control of electric push rod A, motor, electric heating tube and electric push rod B, the ventilation holes of the three inner and outer plates are blocked, which forces the internal circulation of hot air in the machine body and reduces the entry of cold air, thus greatly shortening the defrosting time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0017] Figure 2 This is a schematic diagram showing the location of the electrical box in this utility model;

[0018] Figure 3 This is a schematic diagram of the internal structure of the body of this utility model;

[0019] Figure 4 This is a top view of the internal structure of the present invention;

[0020] Figure 5 This is a schematic diagram of the external structure of the lifting and blowing device of this utility model;

[0021] Figure 6 This is a schematic diagram of the appearance and structure of the breathable plate of this utility model;

[0022] Figure 7 This is a top view of the body of this utility model;

[0023] Figure 8 This is a schematic diagram showing the positions of the bottom surface, the top surface, the inclined surface, and the roller of this utility model;

[0024] Figure 9 This is a schematic diagram of the defrosting airflow direction inside the body of this utility model;

[0025] Icons: 1. Body; 2. Sealing plate; 3. Ventilation plate; 31. Outer plate; 32. Guide strip; 33. Inner plate; 34. Ventilation hole; 35. Pull rod; 36. Roller seat; 37. Roller; 4. Top plate; 5. Electrical box; 6. Lifting and blowing device; 61. Bracket; 62. Motor; 63. Fan; 64. Electric heating element; 65. Fixed cylinder; 66. Electric push rod A; 7. Outdoor heat exchanger; 8. Synchronous lifting device; 81. Air outlet ring; 82. Bearing; 83. Gear ring; 84. Guide plate; 85. Rack; 86. Brake block; 87. Low surface; 88. High surface; 89. Inclined surface; 9. Starting device; 91. Electric push rod B; 92. Hinge seat; 93. Fixed shaft; 10. Temperature sensor; 11. Water outlet; 12. Protective cover. Detailed Implementation

[0026] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] like Figure 1-9 As shown, in this embodiment, an air source heat pump unit with a defrosting structure includes a body 1, which is a rectangular structure. A U-shaped outdoor heat exchanger 7 is fixedly installed inside the body 1. The outdoor heat exchanger 7 consists of copper tubes and fins, and a low-pressure, low-temperature refrigerant flows through it. Three sides of the body 1 are fixedly fitted with vent plates 3 of the same structure, and a sealing plate 2 is fixedly installed on the other side. A top plate 4 is fixedly installed on the top of the body 1. An electrical box is fixedly installed on the body 1 inside the sealing plate 2. 5. A PLC control system is installed inside the electrical box 5. A lifting and blowing device 6 is installed at the center of the machine body 1. The outdoor heat exchanger 7 is placed near the three ventilation plates 3 on its three outer sides. The lifting and blowing device 6 includes a bracket 61, a motor 62, a fan 63, an electric heating tube 64, a fixed cylinder 65, and an electric push rod A66. The motor 62 is fixedly installed between the two U-shaped brackets 61. The fan 63 is fixedly installed at the top output end of the motor 62. The normal operating position of the fan 63 is located at the top of the machine body 1.

[0029] Specifically, the heat pump unit's body 1 also houses the necessary equipment for operation, such as a four-way reversing valve, compressor, and throttling device. In heating mode, for example... Figure 3 As shown, the outdoor heat exchanger 7 acts as an evaporator, absorbing heat from the air. Fan 63 blows air towards the top of the unit 1. Ambient air enters the unit 1 through the vent plate 3, passing over the low-temperature outdoor heat exchanger 7, evaporating the refrigerant into a gaseous state. A four-way reversing valve guides this low-temperature gaseous refrigerant into the compressor, where it is compressed into a high-temperature, high-pressure gas. The four-way reversing valve then directs this high-temperature gas to the indoor heat exchanger to release heat and heat the air. The high-pressure refrigerant, after releasing heat and liquefying, undergoes a rapid depressurization and cooling process through a throttling device, becoming a low-temperature, low-pressure mixture that flows back to the outdoor heat exchanger to begin a new round of heat transfer. It is worth noting that this heat pump unit's heating mode process is a breakthrough in existing technology and will not be described in further detail.

[0030] Furthermore, a disc-shaped electric heating tube 64 is fixed on the bracket 61, and the fixing cylinder 65 is fixed to the bottom surface of the top plate 4. The two ends of the bracket 61 are vertically slidably connected within the fixing cylinder 65. An electric push rod A66 is fixed at the center of the bottom surface of the body 1, and the top output end of the electric push rod A66 is fixed to the motor 62. The motor 62, electric heating tube 64, and electric push rod A66 are wired to the electrical box 5. The motor 62 is controlled to rotate forward and backward through the electrical box 5, and the temperature of the electric heating tube 64 is controlled between 85℃ and 95℃. During defrosting, the electric push rod A66 descends, causing the fan 63 to move downward synchronously into the body 1. This reverses the direction of the motor 62, and after the fan 63 rotates in the opposite direction, its air inlet becomes the upper area of ​​the top outer side of the body 1 and the upper part of the internal space of the body 1. This heats the electric heating tube 64, creating a hot air circulation within the body 1, rapidly increasing the temperature of the outdoor heat exchanger 7 fins, thus achieving rapid defrosting efficiency for the outdoor heat exchanger 7.

[0031] The ventilated plate 3 includes an outer plate 31, guide strips 32, an inner plate 33, vent holes 34, pull rods 35, roller seats 36, and rollers 37. The outer plate 31 is fixedly installed to the machine body 1 by bolts. Vertical guide strips 32 are fixed at both ends of the inner side of the outer plate 31. The inner plate 33 is placed between the guide strips 32 and the outer plate 31. The inner plate 33 is slidably connected up and down along the inner side of the guide strips 32. The outer plate 31 and the inner plate 33 have the same vent holes 34 evenly distributed on them. The vent holes 34 are staggered in the vertical and horizontal directions. Two pull rods 35 are bolted to the top of the inner plate 33. The roller seats 36 are fixed to the top of the pull rods 35. A roller 37 is installed on one side of the roller seats 36 via a shaft.

[0032] Specifically, such as Figure 9 As shown, during defrosting, by lifting the three inner plates 33, the air vents 34 of the inner plates 33 and the air vents 34 of the outer plates 31 change from overlapping to mutually blocking, reducing the air intake of the air vents 3 and improving the efficiency of temperature rise inside the body 1.

[0033] A synchronous lifting device 8 is installed on the top plate 4 to synchronously lift the three inner plates 33, thereby closing the vent holes 34. The synchronous lifting device 8 includes a vent ring 81, a bearing 82, a gear ring 83, a guide plate 84, a rack 85, a brake block 86, a low surface 87, a high surface 88, and an inclined surface 89. A vent ring 81 is fixedly welded to the center of the top of the top plate 4. The vent ring 81 is connected at the top and bottom and is located directly above the fan 63. A bearing 82 is interference-fitted to the outer side of the vent ring 81, and the gear ring 83 is interference-fitted to the outer side. An L-shaped guide plate 84 is welded and fixed to the top plate 4 directly above the three ventilation plates 3 on the outside of the bearing 82. The rack 85 meshes with the gear ring 83 externally and slides along the guide plate 84 internally. Brake blocks 86 are welded and fixed to both ends of the rack 85 respectively. The brake blocks 86 are provided with a low surface 87 and a high surface 88 that are horizontal and at different heights. The low surface 87 and the high surface 88 are connected by an inclined plane 89. The roller 37 rolls on the low surface 87, the high surface 88 and the inclined plane 89.

[0034] Specifically, the roller 37 is initially positioned on the low surface 87. At this time, the vent holes 34 of the outer plate 31 and the inner plate 33 coincide and correspond, which meets the requirements for normal use of the outdoor heat exchanger 7. During defrosting, the rotating gear ring 83 causes the three racks 85 to move synchronously, which in turn drives the brake block 86 to move synchronously, causing the roller 37 to roll along the inclined plane 89 to the higher high surface 88. At this time, the inner plate 33 moves upward synchronously with the roller 37, completing the synchronous lifting of the three inner plates 33.

[0035] A starting device 9 is installed on the top plate 4. The starting device 9 includes an electric push rod B91, a hinge seat 92, and a fixed shaft 93. The electric push rod B91 is connected to the electrical box 5 by wires. The electric push rod B91 is installed at a position hinged to the hinge seat 92. The hinge seat 92 is bolted to the top plate 4, allowing the electric push rod B91 to rotate horizontally through the hinge seat 92. The fixed shaft 93 is vertically fixed to the top surface of the gear ring 83. The output end of the electric push rod B91 is hinged to the fixed shaft 93, allowing the output end of the electric push rod B91 to rotate horizontally along the fixed shaft 93.

[0036] Specifically, during defrosting, since the electric push rod B91 is hinged to the junction seat 92 and its output end is connected to the fixed shaft 93 and can rotate, activating the electric push rod B91 causes its output end to extend, rotating the gear ring 83 by a certain angle. Through the rotation of the gear ring 83, the roller 37 rolls to the high surface 88. After defrosting, the electric push rod B91 resets, causing the roller 37 to roll to the low surface 87.

[0037] A temperature sensor 10 is fixedly installed on the outside of the body 1. The detection end of the temperature sensor 10 is in contact with the fins of the outdoor heat exchanger 7. The temperature sensor 10 is connected to the electrical box 5 by wires.

[0038] Specifically, when temperature sensor 10 detects a fin temperature ≤3℃ for 5 minutes, the electrical control unit 5 automatically triggers the defrost mode via PLC control. Electric push rod A66 descends, motor 62 reverses, electric heating element 64 is energized, and electric push rod B91 extends. When temperature sensor 10 detects a fin temperature ≥48℃ for 120 seconds, the defrost mode is deactivated, electric heating element 64 is turned off, motor 62 rotates forward to reset, electric push rod A66 rises, and electric push rod B91 retracts. This enables fully automatic defrosting of the heat pump unit.

[0039] The bottom plate of the body 1 is provided with a water outlet 11. After the fins defrost, the liquid flows out of the body 1 from the water outlet 11.

[0040] The top of the air vent ring 81 is bolted to a protective cover 12 to prevent larger foreign objects from falling into the machine body 1.

[0041] The working principle of this utility model is as follows: when the temperature sensor 10 continuously detects that the temperature of the outdoor heat exchanger 7 fins is ≤3℃ for 5 minutes, it indicates that the fin surface has been frosted and has reached the level that needs to be removed. At this time, the PLC control system in the electrical box 5 immediately and automatically starts the defrosting mode. The PLC controls the electric push rod B91 to push the gear ring 83 to rotate at a certain angle. The rotation of the gear ring 83 drives the three racks 85 meshing with it to move synchronously in a straight line along their respective guide plates 84. The brake block 86 at the end of the rack 85 moves accordingly, forcing the roller 37, which was originally located on the low surface 87, to roll upward along the inclined surface 89 and finally stabilize on the high surface 88. The upward movement of the roller 37 drives the pull rod 35 to rise through the roller seat 36. The pull rod 35 pulls the inner plate 33 to rise synchronously along the guide bar 32 within the outer plate 31. After the inner plate 33 of the three-sided ventilated plate 3 is raised into place, its vent holes 34 and the vent holes 34 of the outer plate 31 change from overlapping to mutually intersecting and blocking, significantly reducing or basically blocking the passage of cold air from the outside to the machine body 1. Simultaneously, the PLC controls the electric push rod A66 to retract, pulling down the motor 62, the entire bracket 61, the fan 63, and the electric heating tube 64, which are fixedly connected to its top. The bracket 61 slides vertically downwards along the inner wall of the fixed cylinder 65, lowering the fan 63 from its normal operating position at the top of the machine body into the interior of the machine body 1. The PLC controls the motor 62 to reverse, changing the rotation direction of the fan 63, causing its airflow to change from upward suction to downward blowing. At this time, the air intake end of the fan 63 not only draws in the air remaining in the upper space inside the machine body 1, but also draws in external air through the air vent ring 81. The PLC controls the electric heating tube 64 to be energized and heated, and its surface temperature is precisely controlled between 85℃ and 95℃. The disc-shaped structure design facilitates increased heat dissipation area. The fan 63 forcefully blows the air inside the machine body 1 downwards over the surface of the incandescent electric heating tube 64, rapidly heating the air into high-temperature hot air. The high-temperature hot air is forced downwards by the fan 63, impacting the fin surface of the U-shaped outdoor heat exchanger 7. With the three ventilation holes essentially closed, a relatively enclosed space is formed. High-temperature hot air continuously and at high speed circulates between the electric heating element 64, the fan 63, and the outdoor heat exchanger 7. The melted frost layer turns into liquid water, flowing down the fins and the inner wall of the unit 1 and exiting from the outlet 11. When the temperature sensor 10 detects that the fin temperature of the outdoor heat exchanger 7 is ≥48℃ and remains so for 120 seconds, the PLC determines that the frost layer has been completely removed, and the system is in a state where efficient heating can be restored. At this time, the PLC control system automatically executes a reset operation, in the reverse order of startup.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air source heat pump unit with defrosting structure, comprising a machine body (1), the machine body (1) is a rectangular body structure, an outdoor heat exchanger (7) with U-shaped structure is fixedly installed in the machine body (1), characterized in that, The machine body (1) has three sides with the same structure of ventilated plates (3) fixedly installed, and a sealing plate (2) fixedly installed on the other side. The top plate (4) is fixedly installed on the top of the machine body (1). An electrical box (5) is fixed on the machine body (1) inside the sealing plate (2). A PLC control system is installed in the electrical box (5). A lifting blower (6) is installed in the center of the machine body (1). The outdoor heat exchanger (7) is placed close to the three ventilated plates (3) on the three outer sides. The lifting blower (6) includes a bracket (61), a motor (62), a fan (63), an electric heating tube (64), a fixed cylinder (65), and an electric push rod A (66). The motor (62) is fixedly installed between the two U-shaped brackets (61). The fan (63) is fixedly installed at the top output end of the motor (62). The disc-shaped electric heating tube (64) is fixed on the bracket (61). The fixed cylinder (65) is fixed to the bottom surface of the top plate (4). The two ends of the bracket (61) are vertically slidably connected along the inside of the fixed cylinder (65). The electric push rod A (66) is fixed at the center of the bottom surface of the body (1). The top output end of the electric push rod A (66) is fixed to the motor (62).

2. The air source heat pump unit with defrosting structure according to claim 1, characterized in that, The ventilated plate (3) includes an outer plate (31), a guide strip (32), an inner plate (33), vent holes (34), a pull rod (35), a roller seat (36), and a roller (37). The outer plate (31) is fixedly installed to the machine body (1) by bolts. Vertical guide strips (32) are fixed at both ends of the inner side of the outer plate (31). The inner plate (33) is placed between the guide strip (32) and the outer plate (31). The inner plate (33) slides up and down along the inner side of the guide strip (32). The same vent holes (34) are evenly distributed on the outer plate (31) and the inner plate (33). The vent holes (34) are staggered in the vertical and horizontal directions. Two pull rods (35) are bolted to the top of the inner plate (33). The roller seat (36) is fixed to the top of the pull rod (35). A roller (37) is installed on one side of the roller seat (36) through a shaft.

3. The air source heat pump unit with defrosting structure according to claim 2, characterized in that, A synchronous lifting device (8) is installed on the top plate (4) to synchronously lift the three inner plates (33) and close the vent holes (34). The synchronous lifting device (8) includes a vent ring (81), a bearing (82), a gear ring (83), a guide plate (84), a rack (85), a brake block (86), a low surface (87), a high surface (88), and an inclined surface (89). A vent ring (81) is fixed at the top center of the top plate (4). The vent ring (81) is connected at the top and bottom and is located directly above the fan (63). A bearing (82) is interference-fitted on the outside of the vent ring (81). The gear ring (83) An L-shaped guide plate (84) is fixed on the top plate (4) directly above the three ventilation plates (3) and an interference fit is made on the outside of the bearing (82). The rack (85) meshes with the gear ring (83) and slides along the guide plate (84). Brake blocks (86) are fixed at both ends of the rack (85). The brake blocks (86) are provided with a horizontal low surface (87) and a high surface (88) of different heights. The low surface (87) and the high surface (88) are connected by an inclined plane (89). The roller (37) rolls on the low surface (87), the high surface (88) and the inclined plane (89).

4. The air source heat pump unit with defrosting structure according to claim 3, characterized in that, A starting device (9) is installed on the top plate (4). The starting device (9) includes an electric push rod B (91), a hinge seat (92), and a fixed shaft (93). The electric push rod B (91) is connected to the electrical box (5) by wires. The electric push rod B (91) is installed at a hinge position with the hinge seat (92). The hinge seat (92) is bolted to the top plate (4) so ​​that the electric push rod B (91) can rotate horizontally through the hinge seat (92). The fixed shaft (93) is vertically fixed to the top surface of the gear ring (83). The output end of the electric push rod B (91) is hinged to the fixed shaft (93) so that the output end of the electric push rod B (91) can rotate horizontally along the fixed shaft (93).

5. The air source heat pump unit with defrosting structure according to claim 4, characterized in that, A temperature sensor (10) is fixedly installed on the outside of the body (1). The detection end of the temperature sensor (10) is in contact with the fins of the outdoor heat exchanger (7). The temperature sensor (10) is connected to the electrical box (5) by wires.

6. The air source heat pump unit with defrosting structure according to claim 1, characterized in that, The bottom plate of the body (1) is provided with a water outlet (11).

7. An air-source heat pump unit with a defrosting structure according to claim 3, characterized in that, The top of the air vent ring (81) is bolted to a protective cover (12).

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