Adjustable pre-tightening type PTC electric heater for automobile

Abstract

This utility model discloses an adjustable pre-tightening automotive PTC electric heater, relating to the technical field of automotive PTC electric heaters. It includes: a housing, with multiple PTC heating strips disposed inside the housing; a threaded hole extending through one side of the housing; an adjusting thread threadedly connected to the inner wall of the threaded hole; and a movable plate rotatably connected to one end of the adjusting thread. By rotating the adjusting thread, the adjusting thread moves along the thread on the housing, pushing the movable plate to move. Two push-pull plates move simultaneously, causing multiple trapezoidal blocks to push the PTC heating strips, adjusting the distance between the PTC heating strips and the micro-water channels, preventing gaps from forming between the PTC heating strips and the micro-water channels after prolonged use. Simultaneously, the elastic force of the second spring can offset vibrations from vehicle movement. This structure is simple, easy to operate, avoids contact thermal resistance, and improves the service life of the PTC heating strips.

Description

Technical Field

[0001] This utility model relates to the field of automotive PTC electric heater technology, specifically to an adjustable pre-tightening automotive PTC electric heater. Background Technology

[0002] An automotive PTC electric heater is a vehicle heating device designed based on the properties of PTC material. Its main function is to provide heat during vehicle operation to meet various needs of vehicle use. Automotive PTC electric heaters mainly include air-heated PTC heaters and water-heated PTC heaters.

[0003] Chinese utility model patent with authorization announcement number "CN209763492U" is specifically entitled "A PTC liquid heater for new energy vehicles," which includes a controller and a plastic shell with an installation cavity. The controller includes a circuit board and a heat sink. The plastic shell has an installation port, a high-voltage socket installation port, a low-voltage socket installation port, a water inlet, and a water outlet. A heater is installed inside the installation cavity. The heater includes parallel bonded heating water channels and several PTC heating strips. The heating water channels are welded together from a water chamber, several micro water channels, and a water nozzle base. The water nozzle base is connected to an inlet nozzle and an outlet nozzle.

[0004] Although the above-mentioned device has a simple structure and can solve the problems of complex structure, poor sealing, and easy entry of liquid and dust in traditional PTC electric heaters, the PTC heating strip is glued or fixed to the micro water channel with bolts. During vehicle operation, there will be bumpy road sections, which will cause the bolts of the fixing structure to fatigue and loosen or become loose. The PTC heating strip and the micro water channel will gradually develop displacement gaps. The gaps will affect the contact thermal resistance, and the heat of the PTC heating strip cannot be transferred in time. The local temperature is too high, and long-term local overheating accelerates the aging of the PTC heating strip, making it inconvenient to use. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an adjustable pre-tightening automotive PTC electric heater, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an adjustable pre-tightening automotive PTC electric heater, comprising: a housing, wherein multiple PTC heating strips are disposed inside the housing, a threaded hole is provided through one side of the housing, an adjusting thread is threaded to the inner wall of the threaded hole, a movable plate is rotatably connected to one end of the adjusting thread, and push-pull plates are detachably connected to both the upper and lower ends of the movable plate, and multiple trapezoidal blocks are provided on one side of each of the two push-pull plates, the inclined surfaces of the multiple trapezoidal blocks respectively abutting against the inclined surfaces of one side of the PTC heating strips.

[0007] As a further preferred embodiment of this technical solution, a sliding groove is provided on one side of the push-pull plate, and the lower ends of the multiple trapezoidal blocks are slidably connected in the multiple sliding grooves. Multiple springs are fixedly connected between the trapezoidal blocks and the sliding grooves.

[0008] As a further preferred embodiment of this technical solution, a first water chamber is installed at the bottom of the inner shell, a second water chamber is provided on one side of the first water chamber, and a plurality of micro water channels are fixedly connected between the first water chamber and the second water chamber. The plurality of micro water channels are evenly distributed, and one side of the plurality of PTC heating strips is respectively attached to one side of the plurality of micro water channels.

[0009] As a further preferred embodiment of this technical solution, a wire integrator is installed on one side of the inner wall of the housing, and the output end of the wire integrator is electrically connected to the input end of the multiple PTC heating strips through multiple power lines.

[0010] As a further preferred embodiment of this technical solution, a guide frame is slidably connected to the upper end of one of the push-pull plates, and both ends of the guide frame are threaded with mounting screws, with one end of each of the two mounting screws threaded to both sides of the inner wall of the outer casing.

[0011] As a further preferred embodiment of this technical solution, a ratchet is fixedly connected to one side of the outer surface of the adjusting thread, a protective cover is fixedly connected to one side of the outer shell, a rotating rod is rotatably connected to one side of the inner wall of the protective cover, one end of the rotating rod is engaged with any tooth groove of the ratchet, and a spring is fixedly connected between the rotating rod and the protective cover.

[0012] As a further preferred embodiment of this technical solution, a maintenance cover is detachably installed on the upper end of the outer casing, and a sealing ring is provided between the maintenance cover and the outer casing.

[0013] The technical solution provided by this utility model has the following advantages compared with the known prior art: 1. This utility model uses a rotating adjusting thread to move along the thread on the outer shell, pushing the moving plate to move. The two push-pull plates move simultaneously, causing multiple trapezoidal blocks to push the PTC heating strip, adjusting the distance between the PTC heating strip and the micro water channel, preventing gaps from forming between the PTC heating strip and the micro water channel after prolonged use. At the same time, the elasticity of the second spring can offset the vibration of the vehicle. This structure is simple, easy to operate, avoids contact thermal resistance, and improves the service life of the PTC heating strip.

[0014] 2. This utility model uses a ratchet, a rotating rod and a spring to make the adjusting thread rotate only in one direction, preventing the adjusting thread from rotating due to the bumps when the vehicle is moving. This causes the moving plate to move, resulting in a gap between the PTC heating strip and the micro water channel. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram showing the cross-sectional structure of the outer shell and the maintenance cover in this utility model; Figure 3 for Figure 2 A magnified view of a portion of region A in the middle; Figure 4 This is an exploded view of the connection between the PTC heating strip and the push-pull plate in this utility model; Figure 5 for Figure 4 A magnified view of a portion of region B in the middle; Figure 6 This is an exploded view of the connection between the PTC heating strip and the micro water channel in this utility model; Figure 7 This is an exploded structural diagram of the movable plate and the two push-pull plates in this utility model.

[0017] 1. Outer shell; 2. Maintenance cover; 3. Protective cover; 4. Rotating rod; 5. Adjusting thread; 6. Sealing ring; 7. First water chamber; 8. Moving plate; 9. PTC heating strip; 10. Push-pull plate; 11. Wire integrator; 12. Guide frame; 13. Spring 1; 14. Ratchet; 15. Trapezoidal block; 16. Spring 2; 17. Miniature water channel; 18. Second water chamber; 19. Mounting screw. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] The present invention will be further described below with reference to the embodiments.

[0020] This utility model provides a technical solution: such as Figure 1 - Figure 7 As shown, in this embodiment, an adjustable pre-tightening automotive PTC electric heater includes: a housing 1, with multiple PTC heating strips 9 disposed inside the housing 1, a threaded hole extending through one side of the housing 1, an adjusting thread 5 threadedly connected to the inner wall of the threaded hole, a movable plate 8 rotatably connected to one end of the adjusting thread 5, and push-pull plates 10 detachably connected to both the upper and lower ends of the movable plate 8, with multiple trapezoidal blocks 15 disposed on one side of each of the two push-pull plates 10, and the inclined surfaces of the multiple trapezoidal blocks 15 respectively abutting against the inclined surfaces of one side of the PTC heating strips 9.

[0021] By rotating the adjusting thread 5, the adjusting thread 5 moves along the thread on the outer shell 1, pushing the moving plate 8 to move. The two push-pull plates 10 move simultaneously, causing multiple trapezoidal blocks 15 to push the PTC heating strip 9 respectively, adjusting the distance between the PTC heating strip 9 and the micro water channel 17. This prevents gaps from forming between the PTC heating strip 9 and the micro water channel 17 after long-term use. This structure is simple, easy to operate, avoids contact thermal resistance, and improves the use of the PTC heating strip 9.

[0022] It is important to note that when installing the equipment, first install the lower push-pull plate 10 of the movable plate 8, then install the water-conducting tank consisting of the first water chamber 7, the micro water flow channel 17, and the second water chamber 18. After attaching multiple PTC heating strips 9 to the multiple micro water flow channels 17, install another push-pull plate 10 on the upper end of the movable plate 8. Connect the PTC heating strips 9 and the wire integrator 11 using a power cord. Install the guide frame 12 to restrict the sliding of the push-pull plate 10, and then fix the maintenance cover 2 to the outer shell 1.

[0023] like Figure 4 , Figure 5 and Figure 7 As shown, a sliding groove is provided on one side of the push-pull plate 10, and the lower ends of multiple trapezoidal blocks 15 are slidably connected in multiple sliding grooves. Multiple springs 16 are fixedly connected between the trapezoidal blocks 15 and the sliding grooves; the elastic force of the springs 16 can cancel out the vibration of the vehicle.

[0024] like Figure 2 , Figure 4 and Figure 6 As shown, a first water chamber 7 is installed at the bottom of the inner shell 1, and a second water chamber 18 is provided on one side of the first water chamber 7. Multiple micro water channels 17 are fixedly connected between the first water chamber 7 and the second water chamber 18. The multiple micro water channels 17 are evenly distributed, and one side of each of the multiple PTC heating strips 9 is attached to one side of each of the multiple micro water channels 17. An electrical cable integrator 11 is installed on one side of the inner wall of the shell 1. The output end of the electrical cable integrator 11 is electrically connected to the input end of the multiple PTC heating strips 9 through multiple power lines. The PTC heating strips 9 generate heat, which is transferred to the micro water channels 17 to heat the coolant in the micro water channels 17. The heated heat is given to the vehicle to provide heat for the vehicle's operation and meet the vehicle's usage needs.

[0025] like Figure 2 and Figure 7 As shown, a guide frame 12 is slidably connected to the upper end of one of the push-pull plates 10. Both ends of the guide frame 12 are threaded with mounting screws 19. One end of each mounting screw 19 is threaded to both sides of the inner wall of the outer casing 1. The guide frame 12 is used to limit the sliding direction of the push-pull plate 10 and prevent the inclined surface of the trapezoidal block 15 from being misaligned with the inclined surface of the PTC heating strip 9.

[0026] like Figure 1 - Figure 3 As shown, a ratchet 14 is fixedly connected to one side of the outer surface of the adjusting thread 5, a protective cover 3 is fixedly connected to one side of the outer shell 1, a rotating rod 4 is rotatably connected to one side of the inner wall of the protective cover 3, one end of the rotating rod 4 is engaged with any tooth groove of the ratchet 14, and a spring 13 is fixedly connected between the rotating rod 4 and the protective cover 3.

[0027] The ratchet 14, the rotating rod 4 and the spring 13 work together to make the adjusting thread 5 rotate only in one direction, preventing the vehicle from bumping when it is in motion. Prolonged bumping will cause the adjusting thread 5 to rotate, causing the moving plate 8 to move, resulting in a gap between the PTC heating strip 9 and the micro water channel 17.

[0028] It should be noted that when the adjusting thread 5 rotates in the reverse direction, pressing the extension rod at one end of the rotating rod 4 will cause the rotating rod 4 to move out of the tooth groove of the ratchet 14, thus releasing the restriction of the adjusting thread 5.

[0029] like Figure 1 and Figure 2 As shown, a maintenance cover 2 is detachably installed on the upper end of the outer casing 1, and a sealing ring 6 is provided between the maintenance cover 2 and the outer casing 1. The sealing ring 6 is used to seal the gap between the maintenance cover 2 and the outer casing 1 to prevent dust from entering the outer casing 1 and affecting the service life of the PTC heating strip 9.

[0030] This utility model provides an adjustable pre-tightening automotive PTC electric heater, the specific working principle of which is as follows: When the device is in use, the power cord on the wire integrator 11 supplies power to the PTC heating strip 9, which generates heat. The PTC heating strip 9 fits into the micro water channel 17, heating the coolant inside the micro water channel 17. The heated coolant is then pumped out to supply the vehicle. When the device is used for a long time and a gap appears between the PTC heating strip 9 and the micro water channel 17, the adjusting thread 5 is rotated. The adjusting thread 5 moves along the thread on the outer casing 1, pushing the moving plate 8 to move. The two push-pull plates 10 move simultaneously, causing multiple trapezoidal blocks 15 to push the PTC heating strip 9, thus avoiding contact thermal resistance between the PTC heating strip 9 and the micro water channel 17 and improving the service life of the PTC heating strip 9.

[0031] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adjustable preload type automotive PTC electric heater, characterized in that, include: The outer shell (1) has multiple PTC heating strips (9) inside. A threaded hole is opened through one side of the outer shell (1). An adjusting thread (5) is threaded to the inner wall of the threaded hole. A movable plate (8) is rotatably connected to one end of the adjusting thread (5). Push-pull plates (10) are detachably connected to both the upper and lower ends of the movable plate (8). Multiple trapezoidal blocks (15) are provided on one side of each of the two push-pull plates (10). The inclined surfaces of the multiple trapezoidal blocks (15) respectively abut against the inclined surfaces of one side of the PTC heating strip (9).

2. The adjustable preload automotive PTC electric heater according to claim 1, characterized in that: A sliding groove is provided on one side of the push-pull plate (10), and the lower ends of the multiple trapezoidal blocks (15) are slidably connected in the multiple sliding grooves. Multiple springs (16) are fixedly connected between the trapezoidal blocks (15) and the sliding grooves.

3. The adjustable preload automotive PTC electric heater according to claim 1, characterized in that: The bottom of the inner shell (1) is equipped with a first water chamber (7), and a second water chamber (18) is provided on one side of the first water chamber (7). A plurality of micro water channels (17) are fixedly connected between the first water chamber (7) and the second water chamber (18). The plurality of micro water channels (17) are evenly distributed, and one side of the plurality of PTC heating strips (9) is respectively attached to one side of the plurality of micro water channels (17).

4. An adjustable preload automotive PTC electric heater according to claim 3, characterized in that: A wire integrator (11) is installed on one side of the inner wall of the housing (1). The output end of the wire integrator (11) is electrically connected to the input end of the multiple PTC heating bars (9) through multiple power lines.

5. An adjustable preload automotive PTC electric heater according to claim 1, characterized in that: One of the push-pull plates (10) has a guide frame (12) slidably connected to its upper end. Both ends of the guide frame (12) are threaded with mounting screws (19). One end of each of the mounting screws (19) is threaded to both sides of the inner wall of the outer casing (1).

6. An adjustable preload automotive PTC electric heater according to claim 1, characterized in that: A ratchet (14) is fixedly connected to one side of the outer surface of the adjusting thread (5), a protective cover (3) is fixedly connected to one side of the outer shell (1), a rotating rod (4) is rotatably connected to one side of the inner wall of the protective cover (3), one end of the rotating rod (4) is engaged with any tooth groove of the ratchet (14), and a spring (13) is fixedly connected between the rotating rod (4) and the protective cover (3).

7. An adjustable preload automotive PTC electric heater according to claim 1, characterized in that: A maintenance cover (2) is detachably installed on the upper end of the outer shell (1), and a sealing ring (6) is provided between the maintenance cover (2) and the outer shell (1).

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