PTC heater device for household air conditioner

Abstract

The invention discloses a PTC heater device for a household air conditioner, and belongs to the technical field of air conditioner heaters, the PTC heater device comprises an insulating cover, the inner wall of the insulating cover is movably connected with a PTC heating element, the front side of the insulating cover is fixedly connected with a connecting port, and the interior of the insulating cover is fixedly connected with a heat dissipation assembly; second fixing blocks are fixedly connected to the surface of the PTC heating element, the second fixing blocks are symmetrically distributed about the center of the surface of the PTC heating element, third limiting rods are fixedly connected to the inner walls of the second fixing blocks, and sweeping rods are slidably connected to the surfaces of the third limiting rods. The inner wall of the insulating cover is fixedly connected with a baffle, and the interior of the baffle is slidably connected with a sliding column. According to the PTC heater device for the household air conditioner, through the arrangement of the connecting rod and the third limiting rod, the sweeping rod slides on the surface of the PTC heating element, residual dust on the surface of the PTC heating element is effectively reduced, damage of the dust to the device is reduced, and the service life of the PTC heating element is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner heaters, and in particular to a PTC heater device for household air conditioners. Background Art

[0002] Air conditioning heaters, also known as air conditioning heaters, are a key component of air conditioning systems, primarily used to provide hot air in cold weather to heat and regulate the temperature inside a vehicle or indoor space. PTC heaters, also known as PTC heating elements, are primarily used for auxiliary heating in air conditioning. They consist of a galvanized outer pressure plate, a stainless steel corrugated spring sheet, a galvanized inner pressure plate, a single-layer aluminum heat sink, a PTC heating element, a double-layer aluminum heat sink, nickel-plated copper electrode terminals, and a PPS high-temperature plastic electrode sheath. PTC heaters offer low thermal resistance and high heat exchange efficiency, making them automatic, energy-efficient electric heaters with constant temperature. Assembly and connection of PTC heaters are typically achieved using a mounting frame and screws. During assembly, the PTC heaters must be inserted one by one into the mounting frame's fixing slots. After insertion, the mounting frame is closed, and screws are used to secure the mounting frame and PTC heater. However, over time, the screws can oxidize and rust, affecting the overall stability of the PTC heater and causing it to loosen.

[0003] Prior art 1 (application number CN202420718491.2, Chinese patent application date 2024-04-09) A PTC heater that is easy to connect, including a PTC heater body and a connector, the left and right sides of the PTC heater body are fixedly connected with connectors, the outer end surface of the connector is provided with a limiting groove, the upper protruding part of the limiting groove of the connector is the connecting end, the connector of the PTC heater body is slidably connected together through the connector, and the limiting groove and connecting end provided on the connector cooperate with the connecting end and limiting groove of the connector, so that multiple PTC heater bodies can be conveniently connected at the left and right ends. ; Prior art 2 (application number CN202421099967.5, application date 2024-05-20 Chinese patent) A combined PTC heater includes at least two PTC heaters, one end of each PTC heater is fixedly connected to a fixed disk, a rotating disk is connected to the fixed disk for damping rotation, the end surface of the rotating disk is fixedly connected to a driven rod, a slot is provided in the driven rod, and a card slot connected to the slot is provided on the outer surface of the driven rod, one end of the driven rod is fixedly connected to an active rod, the size of the active rod is adapted to the size of the slot, the outer surface of the active rod is provided with a receiving groove, an elastic telescopic member is provided in the receiving groove, and the elastic telescopic member is provided in the elastic telescopic member. A card block is provided on the retracting part, and the card block is used to movably engage the card slot on the driven rod, and a trigger structure for pressing the card block is provided on the driven rod, which solves the problem that when the current PTC heater is actually assembled, the installation components involved in the installation direction of the assembly are not applicable, which affects the disassembly and assembly efficiency and increases the complexity of the assembly; Prior art 3 (Chinese patent application number CN202420311968.5, application date 2024-04-20) A PTC heater includes a PTC assembly and bases on both sides; the PTC assembly includes no less than one ceramic heating core, and the ceramic heating core is equidistantly sleeved with a plurality of heat sink; a connecting platform is formed on one side of the base close to the PTC assembly, and a heat dissipation space is formed between adjacent connecting platforms. The number of connecting platforms is the same as the number of ceramic heating core components. A connecting platform is formed on one side of the base close to the PTC assembly, and a heat dissipation space is formed between adjacent connecting platforms. The ceramic heating core component is connected to the connecting platform, and the heat sink is installed on the ceramic heating core component. The above design can make the side of the base not completely close to the heat sink, only the connecting platform is close, and the rest of the parts are kept at a certain distance. This design is conducive to the heat dissipation of the heat sink here, reduces safety hazards, has a clever structure, and improves product performance.

[0004] After long-term use, a large amount of dust will be generated on the surface of the PTC heater, forming a thick layer of dirt on the surface of the PTC heater, which not only affects the appearance of the equipment, but also excessive dust can cause the heater to malfunction or be damaged. During use, the above-mentioned device cannot remove the dust remaining on the surface of the PTC heater, causing the internal temperature of the heater to rise, the thermal efficiency to decrease, and the energy consumption to increase, shortening the service life of the PTC heater. Summary of the Invention

[0005] The purpose of the present invention is to provide a PTC heater device for household air conditioners to solve the problem raised in the above background technology that the dust remaining on the surface of the PTC heater cannot be removed, resulting in an increase in the internal temperature of the heater, a decrease in thermal efficiency, increased energy consumption, and a shortened service life of the PTC heater.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a PTC heater device for household air conditioners, comprising an insulating cover, an inner wall of the insulating cover being movably connected to a PTC heating element, a connection port being fixedly connected to the front side of the insulating cover, and a heat dissipation assembly being fixedly connected inside the insulating cover; a No. 2 fixed block being fixedly connected to the surface of the PTC heating element, and the No. 2 fixed blocks being symmetrically distributed about the center of the surface of the PTC heating element, and a No. 3 limit rod being fixedly connected to the inner wall of the No. 2 fixed block, and a sweep rod being slidably connected to the surface of the No. 3 limit rod; a baffle being fixedly connected to the inner wall of the insulating cover, and a sliding column being slidably connected inside the baffle, and a protective shell being fixedly connected to the surface of the sliding column, and a telescopic block being movably connected to the surface of the sliding column; a damper being fixedly connected inside the protective shell, and a moving column being slidably connected inside the damper, and the moving column slidingly passes through the protective shell.

[0007] Preferably, a sliding groove is provided inside the protective shell, and a No. 2 limiting rod is fixedly connected to the surface of the sliding groove, and a No. 1 fixing block is slidably connected to the surface of the No. 2 limiting rod.

[0008] The design of the above structure, through the provision of the No. 2 limit rod and the No. 1 fixed block, enables the No. 1 fixed block to slide inside the sliding groove along the No. 2 limit rod, effectively reducing the wear between the No. 1 fixed block and the sliding groove. At the same time, the No. 1 fixed block can slide more accurately along the predetermined path, thereby improving the bearing capacity of the entire structure and extending the service life of the device.

[0009] Preferably, the inner wall of the protective shell is fixedly connected to a shock absorber, and the inner wall of the shock absorber is fixedly connected to a No. 1 spring, and the other end of the No. 1 spring is fixedly connected to the moving column, and the lower surface of the moving column is fixedly connected to the No. 1 fixed block.

[0010] The design of the above structure improves the stability of the device through the provision of the No. 1 spring and the protective shell, and enables the structure to recover to its original state more quickly when subjected to external impact or vibration. At the same time, by reducing the direct impact of external forces on internal components, it helps to extend the service life of the entire structure and reduce the wear and fatigue caused by long-term stress, thereby improving the overall durability.

[0011] Preferably, a connecting column is movably connected to the surface of the No. 1 fixing block, and a force-bearing plate is movably connected to the other end of the connecting column, and the force-bearing plate is fitted with the surface of the PTC heating element.

[0012] The design of the above structure, through the setting of connecting columns and stress-bearing plates, and the surface fit of the stress-bearing plates and the PTC heating element, helps to evenly distribute the stress over the entire surface, avoiding damage caused by local stress concentration, and the uniform stress distribution, thereby extending the service life of the PTC heating element and the stress-bearing plate and improving the reliability of the entire system.

[0013] Preferably, a fixing plate is fixedly connected to the surface of the PTC heating element, the sliding column is slidably connected to the interior of the fixing plate, and a No. 1 limiting rod is fixedly connected to the inner wall of the fixing plate.

[0014] The design of the above structure, through the provision of a fixed plate and a No. 1 limit rod, ensures that the movement range of the sliding column is precisely controlled, and the fixed plate can prevent the sliding column from excessive movement or deviating from the predetermined track, thereby maintaining the integrity and functionality of the structure.

[0015] Preferably, a connecting plate is fixedly connected to the surface of the sliding column, a No. 2 spring is fixedly connected to the surface of the connecting plate, and the other end of the No. 2 spring is fixedly connected to the fixing plate.

[0016] The design of the above structure makes the installation and maintenance of the sliding column easier through the provision of the sliding column and the No. 2 spring. At the same time, by adjusting the preload force of the spring, the sliding column can be easily fine-tuned to adapt to different application scenarios and needs, and to facilitate the replacement or repair of the PTC heating element.

[0017] Preferably, a moving groove is provided inside the sliding column, and a No. 3 spring is fixedly connected to the surface of the moving groove, and the other end of the No. 3 spring is fixedly connected to the telescopic block.

[0018] The design of the above structure, through the provision of a movable groove and a telescopic block, drives the telescopic block to retract toward the surface of the movable groove when the metal pull rope is pulled, and causes the No. 3 spring to retract toward the inner wall of the sliding column, causing the sliding column to slide inside the baffle, and the PTC heating element can be disassembled.

[0019] Preferably, a metal pull rope is fixedly connected to the inner wall of the telescopic block, and the metal pull rope is slidably arranged inside the sliding column.

[0020] The design of the above structure improves the durability of the device by arranging a metal pull rope inside the sliding column. The high strength and stability of the metal pull rope help reduce friction and wear between structural components, thereby extending the service life of the entire system. The corrosion resistance and high temperature resistance of the metal pull rope also enable it to maintain stable performance in harsh working environments.

[0021] Preferably, a connecting rod is fixedly connected to the surface of the connecting plate, and the sweeping rod is fixedly connected to the surface of the connecting rod.

[0022] The design of the above structure reduces the dust residue on the surface of the PTC heating element by setting the connecting rod and the sweeping rod, and drives the sweeping rod to slide on the surface of the No. 3 limit rod through the metal pull rope, reducing the wear between the sweeping rod and the device. At the same time, when the sweeping rod is damaged, only the sweeping rod part needs to be replaced without replacing the entire cleaning device, thereby reducing maintenance costs.

[0023] Preferably, the sweeping rods are symmetrically distributed about the center of the connecting rod.

[0024] The design of the above structure, through the central symmetrical distribution of the sweeping rod, can cover a wider cleaning area at the same time, and at the same time ensure that the entire cleaning device remains balanced during operation, reducing vibration and instability caused by center of gravity offset, and not only improving cleaning efficiency.

[0025] Compared with the prior art, the present invention has the following beneficial effects: a novel structural design is adopted, which enables the sweeping rod to slide on the surface of the PTC heating element, effectively reducing the residual dust on the surface of the PTC heating element, reducing the damage caused by dust to the device, and extending the service life of the PTC heating element. The specific contents are as follows:

[0026] (1) The PTC heater device for household air conditioners, through the provision of a connecting rod and a No. 3 limit rod, enables the sweeping rod to slide on the surface of the PTC heating element, effectively reducing the dust residue on the surface of the PTC heating element and at the same time reducing the damage to the device caused by the dust, ensuring that the heat can be dissipated in time, preventing the occurrence of overheating, and helping to improve the heating performance of the device, ensuring that the PTC heating element can work stably and efficiently, and extending the service life of the PTC heating element.

[0027] Furthermore, the heat dissipation efficiency of the device is improved, and the PTC heating element is ensured to operate stably and effectively, and the risk of failure due to dust accumulation is reduced.

[0028] (2) The PTC heater device for household air conditioners reduces the vibration of the device during operation by setting a load-bearing plate and a connecting column, improves the stability of the device during operation, and reduces the risk of failure caused by vibration. At the same time, the No. 1 spring acts as a buffer, absorbs vibration energy, reduces the impact of noise and vibration on the device, and improves the seismic performance of the device.

[0029] Furthermore, it helps the PTC heater to work more efficiently, while making the air conditioner safer and more stable during operation, thereby improving the working efficiency of the device.

[0030] (3) The PTC heater device for household air conditioners enables the PTC heating element to be disassembled by means of the sliding column and metal pull rope, thereby reducing the damage to components and replacement costs caused by disassembly, and also reducing the overall cost of repairing and replacing the PTC heating element, and ensuring the integrity of the components after disassembly, which not only facilitates subsequent installation and commissioning work, but also improves the stability and reliability of the entire air-conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the connection structure between the PTC heating element and the insulating cover of the present invention;

[0032] Figure 2 This is a schematic diagram of the connection structure between the insulation cover and the connection port of the present invention;

[0033] Figure 3 This is a schematic diagram of the connection structure between the baffle and the protective shell of the present invention;

[0034] Figure 4 This is a schematic diagram of the connection structure between the No. 1 fixing block and the connecting column of the present invention;

[0035] Figure 5 This is a schematic diagram of the connection structure between the connecting column and the load-bearing plate of the present invention;

[0036] Figure 6 This is a schematic diagram of the connection structure between the PTC heating element and the fixing plate of the present invention;

[0037] Figure 7 This is a schematic diagram of the connection structure between the sliding column and the telescopic block of the present invention;

[0038] Figure 8 This is a schematic diagram of the connection structure between the No. 3 spring and the telescopic block of the present invention;

[0039] Figure 9 This is a schematic diagram of the connection structure between the third limiting rod and the second fixing block of the present invention;

[0040] Figure 10 It is a schematic diagram of the connection structure between the connecting plate and the connecting rod of the present invention.

[0041] In the figure: 1. PTC heating element; 2. Insulation cover; 3. Connection port; 4. Heat dissipation assembly; 5. Baffle; 6. Protective shell; 7. Sliding groove; 8. Spring No. 1; 9. Fixed block No. 1; 10. Connecting column; 11. Force plate; 12. Fixed plate; 13. Sliding column; 14. Connecting plate; 15. Spring No. 2; 16. Metal pull rope; 17. Telescopic block; 18. Spring No. 3; 19. Limit rod No. 1; 20. Limit rod No. 2; 21. Connecting rod; 22. Sweep rod; 23. Fixed block No. 2; 24. Limit rod No. 3; 25. Moving groove; 26. Damper; 27. Shock absorber; 28. Moving column. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] Embodiment 1: The stability of the device during operation is improved by providing the insulating cover 2, the stress-bearing plate 11 and the connecting column 10. Figure 1-Figure 5 As shown: it includes an insulating cover 2, the inner wall of the insulating cover 2 is movably connected to the PTC heating element 1, and the front side of the insulating cover 2 is fixedly connected to the connection port 3, and the inside of the insulating cover 2 is fixedly connected to the heat dissipation component 4, the surface of the PTC heating element 1 is fixedly connected to the second fixing block 23, and the second fixing block 23 is symmetrically distributed about the center of the surface of the PTC heating element 1, and the inner wall of the second fixing block 23 is fixedly connected to the third limiting rod 24, and the surface of the third limiting rod 24 is slidably connected to the sweeping rod 22, the inner wall of the insulating cover 2 is fixedly connected to the baffle 5, and the inside of the baffle 5 is slidably connected to the sliding column 13, and the surface of the baffle 5 is fixedly connected to the protective shell 6, and the surface of the sliding column 13 is movably connected to the telescopic block 17, and the protective shell 6 is fixed inside. It is connected to a damper 26, and a moving column 28 is slidably connected inside the damper 26, and the moving column 28 slides through the protective shell 6. A sliding groove 7 is provided inside the protective shell 6, and a No. 2 limit rod 20 is fixedly connected to the surface of the sliding groove 7, and a No. 1 fixed block 9 is slidably connected to the surface of the No. 2 limit rod 20. The inner wall of the protective shell 6 is fixedly connected to a shock absorber 27, and the inner wall of the shock absorber 27 is fixedly connected to a No. 1 spring 8, and the other end of the No. 1 spring 8 is fixedly connected to the moving column 28. At the same time, the lower surface of the moving column 28 is fixedly connected to the No. 1 fixed block 9, and the surface of the No. 1 fixed block 9 is movably connected to a connecting column 10, and the other end of the connecting column 10 is movably connected to a force-bearing plate 11, and the force-bearing plate 11 is in contact with the surface of the PTC heating element 1.

[0044] The device is installed inside the air conditioner through the connection port 3. When the air conditioner is switched to heating mode, current is input to the PTC heating element 1 through the connection port 3. The PTC heating element 1 converts electrical energy into thermal energy and starts to generate heat, thereby heating the environment. At the same time, a heat dissipation component 4 is installed inside the insulating cover 2. The heat generated when the device is working is transferred to the heat dissipation component 4 through heat conduction, and the heat dissipation component 4 is installed at the connection end, which can achieve rapid cooling of the device. When the device shakes, the PTC heating element 1 pushes the force plate 11, so that the connecting column 10 drives the No. 1 fixing block 9 to slide on the surface of the sliding groove 7. At the same time, the No. 1 fixing block 9 drives the No. 1 spring 8 to shrink toward the inner wall of the protective shell 6, thereby achieving shock absorption of the device. When the device stops shaking, the No. 1 spring 8 will push the No. 1 fixing block 9, so that the force plate 11 is tightly attached to the two sides of the PTC heating element 1, maintaining the stability of the device during operation and reducing the risk of failure caused by vibration. At the same time, the No. 1 spring 8 plays a buffering role, absorbing vibration energy, reducing the impact of noise and vibration on the device, which not only improves the seismic performance of the device, but also extends the service life of the device.

[0045] Embodiment 2: In this embodiment, the difference from embodiment 1 is that the second spring 15, the sliding column 13 and the metal pull rope 16 are provided so that the PTC heating element 1 can be disassembled. Figure 6-Figure 8 As shown: a fixed plate 12 is fixedly connected to the surface of the PTC heating element 1, and a sliding column 13 is slidably connected to the inside of the fixed plate 12, and a No. 1 limit rod 19 is fixedly connected to the inner wall of the fixed plate 12, a connecting plate 14 is fixedly connected to the surface of the sliding column 13, and a No. 2 spring 15 is fixedly connected to the surface of the connecting plate 14, and the other end of the No. 2 spring 15 is fixedly connected to the fixed plate 12, a moving groove 25 is opened inside the sliding column 13, and a No. 3 spring 18 is fixedly connected to the surface of the moving groove 25, and the other end of the No. 3 spring 18 is fixedly connected to a telescopic block 17, a metal pull rope 16 is fixedly connected to the inner wall of the telescopic block 17, and the metal pull rope 16 is slidably arranged inside the sliding column 13.

[0046] When the PTC heating element 1 is disassembled, the metal pull rope 16 is pulled to make the sliding column 13 slide inside the fixed plate 12, and the metal pull rope 16 drives the telescopic block 17 to slide toward the surface of the movable groove 25, and at the same time drives the No. 3 spring 18 to retract toward the inside of the sliding column 13, and the connecting plate 14 at the end of the sliding column 13 slides on the surface of the No. 1 limit rod 19, and at the same time the connecting plate 14 compresses the No. 2 spring 15, so that the No. 2 spring 15 retracts toward the inner wall of the fixed plate 12, thereby disassembling the PTC heating element 1 and the insulating cover 2, reducing the damage to components and replacement costs caused by disassembly, and also reducing the overall cost of repairing and replacing the PTC heating element 1, while shortening the time spent on repair, so that maintenance personnel can locate and replace the damaged PTC heating element 1 more quickly, thereby improving maintenance efficiency and ensuring the integrity of the components after disassembly, which not only helps subsequent installation and commissioning work, but also improves the stability and reliability of the entire air-conditioning system.

[0047] Embodiment 3: In this embodiment, the difference from embodiment 2 is that the connection plate 14, the sweeping rod 22 and the third limiting rod 24 are provided to reduce the dust residue on the surface of the PTC heating element 1. Figure 9-10 As shown, a connecting rod 21 is fixedly connected to the surface of the connecting plate 14 , and a sweeping rod 22 is fixedly connected to the surface of the connecting rod 21 . The sweeping rod 22 is symmetrically distributed about the center of the connecting rod 21 .

[0048] When the connecting plate 14 slides on the surface of the No. 1 limit rod 19, the sweeping rod 22 and the connecting plate 14 are connected by the connecting rod 21. During the movement of the connecting plate 14, the connecting rod 21 is driven to move, and then the sweeping rod 22 is made to slide on the surface of the No. 3 limit rod 24. When the PTC heating element 1 is disassembled, the sweeping rod 22 cleans the surface of the PTC heating element 1, reducing the residual dust on the surface of the PTC heating element 1 and the risk of failure caused by dust accumulation, which is convenient for subsequent maintenance and use. At the same time, the surface of the PTC heating element 1 is kept clean, ensuring the normal operation of the air conditioner, and ensuring that the heat can be dissipated in time to prevent overheating. At the same time, the clean surface also helps to improve the heating performance, ensuring that the PTC heating element 1 can work stably and efficiently.

[0049] The above is the working process of the entire device, and the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

Claims

1. A PTC heater device for a household air conditioner, comprising an insulating cover (2), wherein a PTC heating element (1) is movably connected to the inner wall of the insulating cover (2), a connection port (3) is fixedly connected to the front side of the insulating cover (2), and a heat dissipation component (4) is fixedly connected to the interior of the insulating cover (2); Its characteristics are: A second fixing block (23) is fixedly connected to the surface of the PTC heating element (1), and the second fixing block (23) is symmetrically distributed about the center of the surface of the PTC heating element (1), and a third limiting rod (24) is fixedly connected to the inner wall of the second fixing block (23), and a sweeping rod (22) is slidably connected to the surface of the third limiting rod (24); The inner wall of the insulating cover (2) is fixedly connected to a baffle (5), and a sliding column (13) is slidably connected inside the baffle (5), and a protective shell (6) is fixedly connected to the surface of the baffle (5), and a telescopic block (17) is movably connected to the surface of the sliding column (13); The protective shell (6) is fixedly connected to a damper (26), and the damper (26) is slidably connected to a moving column (28), and the moving column (28) slides through the protective shell (6).

2. A PTC heater device for household air conditioner according to claim 1, characterized in that: A sliding groove (7) is provided inside the protective shell (6), and a second limiting rod (20) is fixedly connected to the surface of the sliding groove (7), and a first fixing block (9) is slidably connected to the surface of the second limiting rod (20).

3. A PTC heater device for household air conditioner according to claim 2, characterized in that: The inner wall of the protective shell (6) is fixedly connected to a shock absorber (27), and the inner wall of the shock absorber (27) is fixedly connected to a No. 1 spring (8), and the other end of the No. 1 spring (8) is fixedly connected to the moving column (28), and the lower surface of the moving column (28) is fixedly connected to the No. 1 fixed block (9).

4. A PTC heater device for household air conditioner according to claim 3, characterized in that: The surface of the No. 1 fixing block (9) is movably connected to a connecting column (10), and the other end of the connecting column (10) is movably connected to a force-bearing plate (11), and the force-bearing plate (11) is in contact with the surface of the PTC heating element (1).

5. A PTC heater device for household air conditioner according to claim 4, characterized in that: The surface of the PTC heating element (1) is fixedly connected to a fixing plate (12), the interior of the fixing plate (12) is slidably connected to the sliding column (13), and the inner wall of the fixing plate (12) is fixedly connected to a first limiting rod (19).

6. A PTC heater device for household air conditioner according to claim 5, characterized in that: The surface of the sliding column (13) is fixedly connected to a connecting plate (14), and the surface of the connecting plate (14) is fixedly connected to a No. 2 spring (15), and the other end of the No. 2 spring (15) is fixedly connected to the fixing plate (12).

7. A PTC heater device for household air conditioner according to claim 6, characterized in that: A moving groove (25) is provided inside the sliding column (13), and a No. 3 spring (18) is fixedly connected to the surface of the moving groove (25), and the other end of the No. 3 spring (18) is fixedly connected to the telescopic block (17).

8. A PTC heater device for household air conditioner according to claim 7, characterized in that: A metal pull rope (16) is fixedly connected to the inner wall of the telescopic block (17), and the metal pull rope (16) is slidably arranged inside the sliding column (13).

9. A PTC heater device for household air conditioner according to claim 8, characterized in that: A connecting rod (21) is fixedly connected to the surface of the connecting plate (14), and the sweeping rod (22) is fixedly connected to the surface of the connecting rod (21).

10. A PTC heater device for household air conditioner according to claim 9, characterized in that: The sweeping rods (22) are symmetrically distributed about the center of the connecting rod (21).

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