Vehicle-mounted PTC water heater

Abstract

The application relates to the technical field of vehicle-mounted heaters, in particular to a vehicle-mounted PTC water heater. The vehicle-mounted PTC water heater comprises a water channel assembly and a control assembly, wherein the water channel assembly comprises a lower bottom shell, a fixed aluminum shell and a plurality of heating modules, and the control assembly comprises a conversion plate, a control plate, a high-voltage connector, a low-voltage connector and an upper cover. The application uses an aluminum oxide ceramic shell as a direct separation of the heating unit and the liquid medium, avoids the insulation problem and reduces the thermal resistance, greatly increases the heating power while reducing the volume and weight, and meanwhile, a plurality of aluminum oxide ceramic shells arranged in a staggered mode are matched with guide ribs to form a water baffle effect, thereby guiding and draining the liquid medium entering into the heating installation groove, forming a liquid medium flow channel loop, reducing the required components, reducing the volume and weight, increasing the heating power and improving the liquid medium heating efficiency.

Description

Technical Field

[0001] This invention relates to the field of vehicle-mounted heater technology, and in particular provides a vehicle-mounted PTC water heater. Background Technology

[0002] Currently, there are various technological forms of new energy vehicles, such as range-extended electric vehicles, plug-in hybrid electric vehicles, and pure electric vehicles. Regardless of the form of the new energy vehicle, unlike traditional fuel vehicles that use engine waste heat to heat the passenger compartment, new energy vehicles require additional electric auxiliary heating devices to heat the passenger compartment and battery pack. The mainstream solutions are currently PTC ceramic heating or film heating. In addition, heat pump air conditioning is currently only found in some high-priced models due to its high cost. In traditional PTC water heaters, the barrier between the PTC ceramic resistor and the liquid medium is mostly made of aluminum alloy. Aluminum alloy itself is conductive, so an additional insulating layer needs to be added between the PTC ceramic resistor and the aluminum alloy. The insulating layer is mostly made of polyimide film. This material has excellent insulation properties but a very low thermal conductivity, which greatly increases the thermal resistance of the heat exchange system. Summary of the Invention

[0003] Therefore, it is necessary to provide an on-board PTC water heater to solve at least one of the technical problems in the background art.

[0004] A vehicle-mounted PTC water heater includes a water channel assembly and a control assembly. The water channel assembly includes a lower base shell, a fixed aluminum shell, and multiple heating modules. The top surface of the lower base shell has a heating mounting groove, and the bottom surface of the heating mounting groove has an "S"-shaped guide rib groove. An inlet pipe and an outlet pipe protrude from both ends of one side wall of the lower base shell. The inlet pipe has a recessed inlet, and the outlet pipe has a recessed outlet. Both the inlet and outlet are connected to the heating mounting groove and are connected to external liquid pipes containing a liquid medium to introduce the liquid medium into the heating mounting groove. The shell includes a fixed mounting part and a docking part. One side of the docking part is fixedly installed in the side wall of the fixed mounting part. The top surface of the fixed mounting part is provided with an array of multiple waist-shaped holes. The bottom surface of the fixed mounting part is provided with an EPDM sealing ring. The bottom surface of the EPDM sealing ring is fixedly installed on the periphery of the top surface of the lower shell. The tops of multiple heating modules are respectively fixedly installed in multiple waist-shaped holes. The bottoms and middles of multiple heating modules are located in the heating mounting groove and are staggered to guide and drain the liquid medium in the heating mounting groove. The bottom of the control component is fixedly installed on the top of the water channel component. The control component is used to control the opening and closing of the heating components to adjust the heating power of the liquid medium.

[0005] The control component is used to control the opening and closing of the heating module to adjust the heating power of the liquid medium; As a further improvement of the present invention, each heating module includes an alumina ceramic shell and a heating unit. The top surface of the alumina ceramic shell is recessed with a unit mounting groove. The heating unit is fixedly installed in the unit mounting groove by means of thermally conductive adhesive. The heating unit includes a positive electrode plate, a PTC ceramic resistor and a negative electrode plate. One side wall of the positive electrode plate is fixedly connected to one side wall of the PTC ceramic resistor by means of thermally conductive adhesive. One side wall of the negative electrode plate is fixedly connected to the other side wall of the PTC ceramic resistor by means of thermally conductive adhesive. The thermally conductive adhesive is an organosilicon adhesive that can withstand 250°C for a long time and has a thermal conductivity >1.5W.

[0006] As a further improvement of the present invention, the control component includes an adapter plate, a control plate, a high-voltage connector, a low-voltage connector, and a top cover. A sealing ring is protruding from the periphery of the bottom surface of the top cover, and the bottom of the sealing ring is fixedly installed on the periphery of the top surface of the fixed mounting part. An upper mounting groove is recessed on the bottom surface of the top cover, and the adapter plate and the control plate are installed in the upper mounting groove, and the control plate is electrically connected to the adapter plate. A mounting platform is protruding from the side wall of the top cover adjacent to the docking part, and the low-voltage connector is fixedly installed on the side wall of the mounting platform, and the low-voltage connector is electrically connected to the control plate. The high-voltage connector is fixedly installed on the side wall of the docking part, and the high-voltage connector is electrically connected to the control plate. A docking insertion platform is protruding from the inner side wall of the high-voltage connector. A compression spring groove is recessed on both the top and bottom surfaces of the docking insertion platform. The two compression spring grooves are arranged opposite to each other, and each of the two compression spring grooves is provided with an inclined compression spring, and the two compression springs are arranged symmetrically.

[0007] As a further improvement of the present invention, a negative electrode tab is protruding at one end of the top surface of the negative electrode sheet, and a positive electrode tab is protruding at the end of the top surface of the positive electrode sheet away from the negative electrode tab; the adapter plate is made of conductive material, and a plurality of negative electrode tab docking grooves and a plurality of positive electrode tab docking grooves are respectively recessed through the bottom surface of the adapter plate. The negative electrode tabs and positive electrode tabs of the plurality of heating modules are respectively fixedly installed in the plurality of negative electrode tab docking grooves and the plurality of positive electrode tab docking grooves by soldering. A plurality of connecting terminals are protruding along the length direction on the top surface of the adapter plate. Each connecting terminal is electrically connected to the plurality of heating modules in series, and each connecting terminal is connected in series with a different number of the plurality of heating modules.

[0008] As a further improvement of the present invention, a plurality of IGBT chips are protruding on one side of the bottom surface of the control board. The IGBT chips are used to control the opening and closing of the connection terminals. The bottom of the IGBT chips is fixedly installed on the top of the alumina ceramic shell by thermally conductive adhesive. A plurality of terminal docking grooves are recessed through one side of the middle of the bottom surface of the control board, and the plurality of connection terminals are installed in the plurality of terminal docking grooves.

[0009] As a further improvement of the present invention, the gaps between the multiple alumina ceramic shells interspersed on the bottom shell and the fixed aluminum shell and the fixed aluminum shell are filled with potting compound.

[0010] As a further improvement of the present invention, a socket groove is recessed on the top surface of the fixed mounting part near the docking part, and a docking mounting groove is recessed in the middle of the outer sidewall of the docking part. The docking mounting groove is connected to the socket groove. Bolt grooves are recessed at the four corners of the outer sidewall of the docking part. An annular cavity is formed inside the docking part, and the four corners of the annular cavity are connected to the four bolt grooves. A spring locking groove is recessed in the middle of the top and bottom surfaces of the docking mounting groove. The two spring locking grooves are arranged opposite to each other and are connected to the annular cavity. An inclined locking surface is recessed at the bottom corner of the inner sidewall of the two spring locking grooves. A sliding pushing groove is recessed in the middle of the two sidewalls of the docking mounting groove. The two sliding pushing grooves are connected to the annular cavity.

[0011] As a further improvement of the present invention, two snap-fit ​​elements and two push-fit elements are provided in the annular cavity. The two snap-fit ​​elements are symmetrically arranged at the top and bottom of the annular cavity, and the two push-fit elements are symmetrically arranged on both sides of the annular cavity.

[0012] As a further improvement of the present invention, each snap-fit ​​element includes two rotating mounting platforms, a snap-fit ​​rotating shaft, a snap-fit ​​triangular block, and two bevel gears. The two rotating mounting platforms are respectively fixedly installed at both ends of the top of the annular cavity. A rotating hole is recessed through one side wall of each of the two rotating mounting platforms. The two ends of the snap-fit ​​rotating shaft are respectively rotatably installed in the two rotating holes by torsion springs. The snap-fit ​​triangular block is fixedly installed in the middle of the snap-fit ​​rotating shaft. The side wall of the snap-fit ​​triangular block abuts against the side wall of the compression spring snap-fit ​​groove, and the bottom of the snap-fit ​​triangular block protrudes into the mating mounting groove. The side walls of the two bevel gears are respectively fixedly installed at both ends of the snap-fit ​​rotating shaft.

[0013] As a further improvement of the present invention, each pushing element includes two sliding straight racks, two pushing platforms, two elastic arc strips, and two sliding plates. One side wall of the two sliding straight racks is slidably installed at both ends of the inner side wall of the annular cavity. One end of the two sliding straight racks is meshed with two bevel gears, and the end of the sliding straight rack adjacent to the bevel gear is recessed with an arc-shaped surface. One side of the two pushing platforms is fixedly installed at both ends of the middle of the inner side wall of the annular cavity and is respectively arranged opposite to the two sliding straight racks. The top surface of the two pushing platforms is respectively recessed with sliding grooves. One end of the two elastic arc strips is fixedly installed at the end of the two sliding straight racks away from the bevel gears. The middle of the two elastic arc strips is slidably installed in the two sliding grooves. The other end of the two elastic arc strips is fixedly connected to the two sliding plates, and one end of the two elastic arc strips is slidably installed in the sliding pushing groove.

[0014] The beneficial effects of this invention are as follows: 1. This invention utilizes an alumina ceramic shell as a direct separator between the heating unit and the liquid medium, avoiding insulation problems and reducing thermal resistance. While reducing size and weight, it can greatly increase heating power. At the same time, multiple staggered alumina ceramic shells cooperate with the guide rib groove to form a baffle, thereby guiding and diverting the liquid medium entering the heating installation tank, thus forming a flow channel loop for the liquid medium. This reduces the required components, shrinks the size and weight, increases heating power, and improves the heating efficiency of the liquid medium.

[0015] 2. The gaps between the multiple alumina ceramic shells interspersed on the lower shell and the fixed aluminum shell are sealed with potting compound to form a good seal, preventing liquid medium leakage or entry into other parts of the equipment, thus improving the reliability and safety of the equipment. Simultaneously, it prevents current or heat conduction through the gaps between the alumina ceramic shells and the fixed aluminum shell, thereby avoiding insulation problems, improving the stability of the equipment, and providing a protective layer to prevent corrosive substances in the liquid medium from eroding the fixed aluminum shell. It also increases the connection strength between the alumina ceramic shells and the fixed aluminum shell, improving the equipment's seismic resistance, extending its service life, and reducing the frequency of maintenance and component replacement, ensuring that the heating process of the liquid medium is efficient, stable, and controllable. 3. The bottom of the IGBT chip is fixed to the top of the alumina ceramic shell with thermally conductive adhesive. This utilizes the direct contact between the alumina ceramic shell and the liquid medium to dissipate the heat generated by the IGBT chip during operation, thus ensuring the heat dissipation requirements of the IGBT chip.

[0016] 4. Using high-voltage connectors and fixed aluminum shells, when the high-voltage connectors are snapped into the fixed aluminum shells, snap-fit ​​elements are used to compress and lock the springs in the high-voltage connectors. Pushing elements are used in conjunction to clamp and fix the mating terminals in the high-voltage connectors, ensuring the stability and reliability of the connection. This achieves integrated fastening and clamping of the high-voltage connectors, and ensures the stability of the springs, preventing loosening or falling off. Attached Figure Description

[0017] Figure 1 This is an exploded view of an embodiment of the present invention.

[0018] Figure 2 This is a three-dimensional schematic diagram of the lower bottom shell in one embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the heating unit in one embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional schematic diagram of a high-voltage connector in one embodiment of the present invention.

[0021] Figure 5This is a three-dimensional schematic diagram of a fixed aluminum shell in one embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the interior of the fixed aluminum shell in one embodiment of the present invention.

[0023] Figure 7 This is an internal schematic diagram of the fixed aluminum shell in another embodiment of the present invention.

[0024] Figure 8 for Figure 6 Enlarged diagram of point A in the middle.

[0025] In the diagram: 20. Water channel assembly; 21. Lower shell; 211. Heating mounting groove; 212. Guide rib groove; 22. Fixed aluminum shell; 221. Fixed mounting part; 222. Connecting part; 223. Waist-shaped hole; 224. EPDM sealing ring; 225. Connecting mounting groove; 226. Bolt groove; 227. Annular cavity; 228. Compression spring locking groove; 229. Inclined locking surface; 220. Sliding pushing groove; 23. Water inlet pipe; 231. Water inlet; 24. Water outlet pipe; 241. Water outlet hole; 26. Heating module; 261. Alumina ceramic shell; 262. Heating unit; 263. Unit mounting groove; 264. Positive electrode plate; 265. PTC ceramic resistor; 266. Negative electrode plate; 267. Negative electrode tab; 268. Positive electrode tab; 28. Encapsulation 29. Socket slot; 30. Control component; 31. Adapter plate; 311. Negative electrode tab mating slot; 312. Positive electrode tab mating slot; 313. Connecting terminal; 32. Control board; 321. IGBT chip; 322. Terminal mating slot; 33. High voltage connector; 331. Compression spring; 332. Butt joint platform; 333. Compression spring slot; 34. Low voltage connector; 35. Top cover; 352. Sealing ring; 353. Mounting platform; 10. Snap-fit ​​element; 101. Rotary mounting platform; 102. Snap-fit ​​rotating shaft; 103. Snap-fit ​​triangular block; 104. Bevel gear; 105. Rotating hole; 11. Pushing element; 111. Sliding spur rack; 112. Pushing platform; 113. Elastic arc strip; 114. Sliding plate; 115. Arc surface; 116. Sliding groove. Detailed Implementation

[0026] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0027] In the description of this invention, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] Please see Figures 1 to 8 A vehicle-mounted PTC water heater includes a water channel assembly 20 and a control assembly 30. The water channel assembly 20 includes a lower base shell 21, a fixed aluminum shell 22, and multiple heating modules 26. The top surface of the lower base shell 21 is provided with a heating mounting groove 211, and the bottom surface of the heating mounting groove 211 is recessed with an "S"-shaped guide rib groove 212. A water inlet pipe 23 and a water outlet pipe 24 protrude from both ends of one side wall of the lower base shell 21, respectively. The side wall of the water inlet pipe 23 has a recessed water inlet 231, and the side wall of the water outlet pipe 24 has a recessed water outlet 241. Both the water inlet 231 and the water outlet 241 are connected to the heating mounting groove 211. The water inlet 231 and the water outlet 241 are connected to external liquid pipes containing a liquid medium, which is then introduced into the heating mounting groove 211. The fixed aluminum shell 22 includes a fixed mounting part 221 and a docking part 222. One side of the docking part 222 is fixedly installed in the side wall of the fixed mounting part 221. The top surface of the fixed mounting part 221 is provided with a plurality of waist-shaped holes 223. The bottom surface of the fixed mounting part 221 is provided with an EPDM sealing ring 224. The bottom surface of the EPDM sealing ring 224 is fixedly installed on the periphery of the top surface of the lower bottom shell 21. The tops of the plurality of heating modules 26 are respectively fixedly installed in the plurality of waist-shaped holes 223. The bottom and middle of the plurality of heating modules 26 are located in the heating mounting groove 211 and are staggered to guide and drain the liquid medium in the heating mounting groove 211. The bottom of the control component 30 is fixedly installed on the top of the water channel component 20. The control component 30 is used to control the opening and closing of the heating modules 26 to adjust the heating power of the liquid medium.

[0030] Each heating module 26 includes an alumina ceramic shell 261 and a heating unit 262. The top surface of the alumina ceramic shell 261 is recessed with a unit mounting groove 263. The heating unit 262 is fixedly installed in the unit mounting groove 263 by thermally conductive adhesive. The heating unit 262 includes a positive electrode plate 264, a PTC ceramic resistor 265 and a negative electrode plate 266. One side wall of the positive electrode plate 264 is fixedly connected to one side wall of the PTC ceramic resistor 265 by thermally conductive adhesive. One side wall of the negative electrode plate 266 is fixedly connected to the other side wall of the PTC ceramic resistor 265 by thermally conductive adhesive. The thermally conductive adhesive is an organosilicon adhesive that can withstand 250℃ for a long time and has a thermal conductivity >1.5W.

[0031] The control assembly 30 includes an adapter plate 31, a control plate 32, a high-voltage connector 33, a low-voltage connector 34, and a top cover 35. A sealing ring 352 protrudes from the periphery of the bottom surface of the top cover 35, and the bottom of the sealing ring 352 is fixedly installed on the periphery of the top surface of the fixed mounting part 221. An upper mounting groove is recessed from the bottom surface of the top cover 35, and the adapter plate 31 and the control plate 32 are installed in the upper mounting groove. The control plate 32 is electrically connected to the adapter plate 31. A mounting platform 353 protrudes from the side wall of the top cover 35 near the docking part 222. The low-voltage connector 34... The high-voltage connector 33 is fixedly installed on the side wall of the mounting platform 353 and electrically connected to the control board 32. The high-voltage connector 33 is fixedly installed on the side wall of the docking part 222 and electrically connected to the control board 32. The inner side wall of the high-voltage connector 33 has a protruding docking platform 332. The top and bottom surfaces of the docking platform 332 are recessed with spring grooves 333. The two spring grooves 333 are arranged opposite to each other, and each of the two spring grooves 333 has an inclined spring 331. The two springs 331 are arranged symmetrically.

[0032] The negative electrode plate 266 has a negative electrode tab 267 protruding from one end of its top surface, and the positive electrode plate 264 has a positive electrode tab 268 protruding from the end of its top surface away from the negative electrode tab 267. The adapter plate 31 is made of conductive material, and the bottom surface of the adapter plate 31 is recessed with multiple negative electrode tab docking grooves 311 and multiple positive electrode tab docking grooves 312. The negative electrode tabs 267 and positive electrode tabs 268 of the multiple heating modules 26 are fixedly installed in the multiple negative electrode tab docking grooves 311 and multiple positive electrode tab docking grooves 312 by soldering. The top surface of the adapter plate 31 has multiple connecting terminals 313 protruding along its length. Each connecting terminal 313 is electrically connected to the multiple heating modules 26 in series, and each connecting terminal 313 is connected in series with a different number of multiple heating modules 26.

[0033] Multiple IGBT chips 321 are protruding on one side of the bottom surface of the control board 32. The IGBT chips 321 are used to control the opening and closing of the connection terminals 313. The bottom of the IGBT chips 321 is fixedly installed on the top of the alumina ceramic shell 261 by thermally conductive adhesive. Multiple terminal docking grooves 322 are recessed through one side of the middle of the bottom surface of the control board 32. Multiple connection terminals 313 are installed in the multiple terminal docking grooves 322.

[0034] The gaps between the multiple alumina ceramic shells 261 interspersed on the lower shell 21 and the fixed aluminum shell 22 and the fixed aluminum shell 22 are filled with potting compound 28.

[0035] The top surface of the fixed mounting part 221 is recessed with a socket groove 29 on the side adjacent to the docking part 222. The middle of the outer side wall of the docking part 222 is recessed with a docking mounting groove 225, which is connected to the socket groove 29. The four corners of the outer side wall of the docking part 222 are recessed with bolt grooves 226. The interior of the docking part 222 is hollow to form an annular cavity 227, and the four corners of the annular cavity 227 are connected to the four bolt grooves 226. The middle of the top and bottom surfaces of the docking mounting groove 225 are recessed with spring locking grooves 228. The two spring locking grooves 228 are arranged opposite each other and are connected to the annular cavity 227. The bottom corners of the inner side walls of the two spring locking grooves 228 are recessed with inclined locking surfaces 229. The middle of the two side walls of the docking mounting groove 225 are recessed with sliding pushing grooves 220, which are connected to the annular cavity 227.

[0036] The annular cavity 227 is provided with two snap-fit ​​elements 10 and two push-fit elements 11. The two snap-fit ​​elements 10 are symmetrically arranged at the top and bottom of the annular cavity 227, and the two push-fit elements 11 are symmetrically arranged on both sides of the annular cavity 227.

[0037] Each snap-fit ​​element 10 includes two rotating mounting platforms 101, a snap-fit ​​rotating shaft 102, a snap-fit ​​triangular block 103, and two bevel gears 104. The two rotating mounting platforms 101 are respectively fixedly installed at the top two ends of the annular cavity 227. A rotating hole 105 is recessed through one side wall of each of the two rotating mounting platforms 101. The two ends of the snap-fit ​​rotating shaft 102 are respectively rotatably installed in the two rotating holes 105 by torsion springs. The snap-fit ​​triangular block 103 is fixedly installed in the middle of the snap-fit ​​rotating shaft 102. The side wall of the snap-fit ​​triangular block 103 abuts against the side wall of the compression spring snap-fit ​​groove 228, and the bottom of the snap-fit ​​triangular block 103 protrudes into the mating mounting groove 225. The side walls of the two bevel gears 104 are respectively fixedly installed at both ends of the snap-fit ​​rotating shaft 102.

[0038] Each pushing element 11 includes two sliding racks 111, two pushing platforms 112, two elastic arc-shaped bars 113, and two sliding plates 114. The two sliding racks 111 are slidably mounted on one side wall of the inner side wall of the annular cavity 227. One end of the two sliding racks 111 is meshed with two bevel gears 104, and the end of the sliding rack 111 adjacent to the bevel gear 104 is recessed with an arc-shaped surface 115. The two pushing platforms 112 are respectively fixedly mounted on one side of the middle of the inner side wall of the annular cavity 227. Two sliding spur racks 111 are respectively positioned opposite to the two sliding spur racks 111 at both ends. The top surfaces of the two extrusion tables 112 are respectively provided with recessed sliding grooves 116. One end of each of the two elastic arc strips 113 is fixedly installed on the end of the two sliding spur racks 111 away from the bevel gear 104. The middle of the two elastic arc strips 113 is slidably installed in the two sliding grooves 116. The other end of the two elastic arc strips 113 is fixedly connected to the two sliding plates 114, and one end of the two elastic arc strips 113 is slidably installed in the sliding extrusion groove 220.

[0039] For example, in one embodiment: the guide rib groove 212 is provided with a plurality of connecting reinforcing ribs at equal intervals along its length, and each connecting reinforcing rib has a mating groove on both sides of its sidewalls. When the tops of the plurality of heating modules 26 are respectively fixedly installed in the plurality of waist-shaped holes 223, one sidewall of one alumina ceramic shell 261 of the heating module 26 will be engaged into the mating groove while the other sidewall will abut against the sidewall of the heating mounting groove 211. At the same time, one sidewall of the other alumina ceramic shell 261 will be engaged into the other mating groove of the connecting reinforcing rib. Since the plurality of heating modules 26 are staggered, the plurality of heating modules 26 and the plurality of connecting reinforcing ribs will then... The reinforcing ribs and guide rib grooves 212 work together to form a baffle, allowing the liquid medium entering from the inlet 231 to flow in an "S" shape in the heating mounting groove 211 until it flows out from the outlet 241. This quickly and unidirectionally removes the heat generated by the heating module 26, providing rapid and uniform heating for the liquid medium. At the same time, the bottom of the IGBT chip 321 is fixed to the top of the alumina ceramic shell 261 with thermally conductive adhesive, allowing the heat generated by the operation of the IGBT chip 321 to be carried away by the direct contact between the alumina ceramic shell 261 and the liquid medium, ensuring the heat dissipation requirements of the IGBT chip 321.

[0040] For example, in one embodiment: Since one sidewall of the positive electrode 264 is fixedly connected to one sidewall of the PTC ceramic resistor 265 via thermally conductive adhesive, and one sidewall of the negative electrode 266 is fixedly connected to the other sidewall of the PTC ceramic resistor 265 via thermally conductive adhesive, and the thermally conductive adhesive is an organosilicon adhesive that can withstand 250℃ for a long time and has a thermal conductivity >1.5W, the heat from the PTC ceramic resistor 265 is directly transferred to the alumina ceramic shell 261 through the positive electrode 264 and the negative electrode 266, and then directly transferred to the fluid medium from the alumina ceramic shell 261. This greatly reduces thermal resistance and avoids insulation problems, significantly increasing heating power while reducing size and weight. It achieves rapid and uniform heating of the liquid medium, improves heating power, and ensures system stability and reliability through heat conduction and heat dissipation design. For example, in one embodiment: when the high-voltage connector 33 is inserted into the mating mounting groove 225, the top surfaces of the two compression springs 331 in the high-voltage connector 33 will push the bottom of the snap-fit ​​triangular block 103 to rotate inward, causing the snap-fit ​​rotating shaft 102 to rotate around the rotating hole 105, which in turn causes the two bevel gears 104 to rotate, which in turn causes the two sliding racks 111 to move toward the center of the annular cavity 227, which in turn causes the top of the sliding racks 111 to disengage from the bolt groove 226, releasing the bolt groove 226 from closing, so that after the snap-fit ​​is completed, a bolt can be inserted into the bolt groove 226, thereby making the high-voltage connector 33 more securely installed in the mating part 222.

[0041] As the sliding rack 111 moves toward the center of the annular cavity 227, it pushes the elastic arc strip 113 inward along the sliding groove 116 on the extrusion table 112, thereby causing the sliding plate 114 to move toward the center of the docking mounting groove 225 along the sliding extrusion groove 220, until the outer wall of the sliding plate 114 abuts against the two side walls of the docking mounting plate 332 in the high-voltage connector 33, thereby forming a clamping and fixing effect on the docking mounting plate 332.

[0042] At the same time, the top surface of the compression spring 331 will abut against the inclined snap-fit ​​surface 229, and the snap-fit ​​triangular block 103 will flip over, with its right-angled end snapped between the compression spring 331 and the inner side wall of the sliding push groove 220, further tightening and stabilizing the compression spring 331.

[0043] Installation process: The bottom surface of the EPDM sealing ring 224 is fixedly installed on the periphery of the top surface of the lower shell 21. The tops of multiple heating modules 26 are respectively fixedly installed in multiple oblong holes 223, and the bottoms and middles of multiple heating modules 26 are located in the heating mounting groove 211 and are arranged in an alternating manner. The heating unit 262 is fixedly installed in the unit mounting groove 263 by thermally conductive adhesive. One side wall of the positive electrode plate 264 is fixedly connected to one side wall of the PTC ceramic resistor 265 by thermally conductive adhesive. One side wall of the negative electrode plate 266 is fixedly connected to the PTC ceramic resistor 265 by thermally conductive adhesive. 5. The other side wall is fixedly connected, the bottom of the sealing ring 352 is fixedly installed on the periphery of the top surface of the fixed mounting part 221, the adapter plate 31 and the control plate 32 are installed in the upper mounting groove, and the control plate 32 is electrically connected to the adapter plate 31, the low-voltage connector 34 is fixedly installed on the side wall of the mounting platform 353, and the low-voltage connector 34 is electrically connected to the control plate 32, the high-voltage connector 33 is fixedly installed on the side wall of the docking part 222, and the high-voltage connector 33 is electrically connected to the control plate 32, the bottom of the IGBT chip 321 is fixedly installed on the top of the alumina ceramic shell 261 with thermally conductive adhesive, and the two rotating mounts... Mounting platforms 101 are fixedly installed at both ends of the top of the annular cavity 227. The two ends of the snap-fit ​​rotating shaft 102 are rotatably installed in two rotating holes 105 via torsion springs. A snap-fit ​​triangular block 103 is fixedly installed in the middle of the snap-fit ​​rotating shaft 102, with its sidewall abutting against the sidewall of the compression spring locking groove 228, and its bottom protruding into the mating mounting groove 225. The sidewalls of two bevel gears 104 are fixedly installed at both ends of the snap-fit ​​rotating shaft 102. One sidewall of two sliding spur racks 111 is slidably installed at both ends of the inner sidewall of the annular cavity 227. One end of the rack 111 is meshed with two bevel gears 104. Two extrusion platforms 112 are fixedly installed on one side of the inner side wall of the annular cavity 227 at both ends and are respectively opposite to the two sliding racks 111. One end of two elastic arc strips 113 is fixedly installed on the end of the two sliding racks 111 away from the bevel gears 104. The middle of the two elastic arc strips 113 is slidably installed in the two sliding grooves 116. The other end of the two elastic arc strips 113 is fixedly connected to two sliding plates 114, and one end of the two elastic arc strips 113 is slidably installed in the sliding extrusion groove 220.

[0044] This invention can achieve: 1. This invention utilizes an alumina ceramic shell 261 as a direct separator between the heating unit 262 and the liquid medium, avoiding insulation problems and reducing thermal resistance. While reducing volume and weight, it can greatly increase heating power. At the same time, multiple staggered alumina ceramic shells 261 cooperate with the guide rib groove 212 to form a baffle, thereby guiding and diverting the liquid medium entering the heating mounting groove 211, thus forming a flow channel loop for the liquid medium, reducing the required components, reducing volume and weight, increasing heating power, and improving the heating efficiency of the liquid medium.

[0045] 2. The gaps between the multiple alumina ceramic shells 261 interspersed on the lower base shell 21 and the fixed aluminum shell 22 and the fixed aluminum shell 22 are sealed with potting compound 28 to form a good seal, preventing liquid medium leakage or entry into other parts of the equipment, improving the reliability and safety of the equipment. Simultaneously, it also prevents current or heat from being conducted through the gaps between the alumina ceramic shells 261 and the fixed aluminum shell 22, thus avoiding insulation problems, improving the stability of the equipment, and providing a protective layer to prevent corrosive substances in the liquid medium from eroding the fixed aluminum shell 22. It also increases the connection strength between the alumina ceramic shells 261 and the fixed aluminum shell 22, improving the equipment's seismic resistance, extending its service life, and reducing the frequency of maintenance and component replacement, ensuring that the heating process of the liquid medium is efficient, stable, and controllable. 3. The bottom of the IGBT chip 321 is fixedly mounted to the top of the alumina ceramic shell 261 with thermally conductive adhesive. The direct contact between the alumina ceramic shell 261 and the liquid medium carries away the heat generated by the IGBT chip 321 during operation, thus ensuring the heat dissipation requirements of the IGBT chip 321.

[0046] 4. Using the high-voltage connector 33 and the fixed aluminum shell 22, when the high-voltage connector 33 is snapped into the fixed aluminum shell 22, the snap-fit ​​element 10 is used to compress and lock the compression spring 331 in the high-voltage connector 33. The push element 11 is used to clamp and fix the mating plug 332 in the high-voltage connector 33, ensuring the stability and reliability of the connection. This achieves the integrated fastening and clamping of the high-voltage connector 33, and ensures the stability of the compression spring 331, preventing loosening or falling off.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A vehicle-mounted PTC water heater, characterized in that: The water channel assembly (20) includes a water channel component (20) and a control component (30). The water channel component (20) includes a lower bottom shell (21), a fixed aluminum shell (22), and multiple heating modules (26). The top surface of the lower bottom shell (21) is provided with a heating mounting groove (211), and the bottom surface of the heating mounting groove (211) is recessed with an "S"-shaped guide rib groove (212). The two ends of one side wall of the lower bottom shell (21) are respectively provided with an inlet pipe (23) and an outlet pipe (24). The inlet pipe (23) is provided with a water outlet pipe (24). 3) A water inlet (231) is provided through the side wall recess, and a water outlet (241) is provided through the side wall recess. Both the water inlet (231) and the water outlet (241) are connected to the heating installation tank (211). The water inlet (231) and the water outlet (241) are respectively connected to the external liquid pipe. The external liquid pipe contains a liquid medium, so as to introduce the liquid medium in the liquid pipe into the heating installation tank (211) to fix the aluminum shell. (22) Includes a fixed mounting part (221) and a docking part (222). The docking part (222) is fixedly installed in the side wall of the fixed mounting part (221) on one side. The top surface of the fixed mounting part (221) is recessed with multiple waist-shaped holes (223). The bottom surface of the fixed mounting part (221) is convex with an EPDM sealing ring (224). The bottom surface of the EPDM sealing ring (224) is fixedly installed on the periphery of the top surface of the lower shell (21). The tops of multiple heating modules (26) are fixedly installed in multiple waist-shaped holes (223). The bottom and middle of multiple heating modules (26) are located in the heating mounting groove (211) and are staggered to guide and drain the liquid medium in the heating mounting groove (211). The bottom of the control component (30) is fixedly installed on the top of the water channel component (20). The control component (30) is used to control the opening and closing of the heating module (26) to adjust the heating power of the liquid medium. The high-voltage connector (33) is fixedly installed on the side wall of the docking part (222), and the high-voltage connector (33) is electrically connected to the control board (32) of the control component (30). The inner side wall of the high-voltage connector (33) is provided with a docking platform (332). The top and bottom surfaces of the docking platform (332) are both recessed with spring grooves (333). The two spring grooves (333) are arranged opposite to each other, and each of the two spring grooves (333) is provided with an inclined spring (331). The two springs (331) are arranged symmetrically. The top surface of the fixed mounting part (221) is recessed with a socket groove (29) on one side adjacent to the docking part (222). The middle part of the outer sidewall of the docking part (222) is recessed with a docking mounting groove (225), which is connected to the socket groove (29). Bolt grooves (226) are recessed at the four corners of the outer sidewall of the docking part (222). The docking part (222) is hollow inside to form an annular cavity (227), and the four corners of the annular cavity (227) are respectively recessed with four bolt grooves (226). 226) Connected, the top and bottom surfaces of the mating mounting groove (225) are respectively provided with spring locking grooves (228), the two spring locking grooves (228) are arranged opposite to each other and are connected to the annular cavity (227), the bottom corner of the inner side wall of the two spring locking grooves (228) is provided with an inclined locking surface (229), the middle of the two side walls of the mating mounting groove (225) is provided with a sliding pushing groove (220), and the two sliding pushing grooves (220) are connected to the annular cavity (227); The annular cavity (227) is provided with two snap-fit ​​elements (10) and two push elements (11). The two snap-fit ​​elements (10) are symmetrically arranged at the top and bottom of the annular cavity (227), and the two push elements (11) are symmetrically arranged on both sides of the annular cavity (227). Each snap-fit ​​element (10) includes two rotating mounting platforms (101), a snap-fit ​​rotating shaft (102), a snap-fit ​​triangular block (103), and two bevel gears (104). The two rotating mounting platforms (101) are fixedly installed at the top two ends of the annular cavity (227). A rotating hole (105) is recessed through one side wall of each of the two rotating mounting platforms (101). The two ends of the snap-fit ​​rotating shaft (102) are rotatably installed in the two rotating holes (105) by torsion springs. The snap-fit ​​triangular block (103) is fixedly installed in the middle of the snap-fit ​​rotating shaft (102). The side wall of the snap-fit ​​triangular block (103) abuts against the side wall of the compression spring snap-fit ​​groove (228), and the bottom of the snap-fit ​​triangular block (103) protrudes into the mating mounting groove (225). The side walls of the two bevel gears (104) are fixedly installed at both ends of the snap-fit ​​rotating shaft (102). Each pushing element (11) includes two sliding racks (111), two pushing platforms (112), two elastic arc strips (113), and two sliding plates (114). The two sliding racks (111) are slidably mounted on one side wall of the inner side wall of the annular cavity (227). One end of the two sliding racks (111) is meshed with two bevel gears (104), and the sliding racks (111) are recessed with an arc surface (115) near the bevel gears (104). The two pushing platforms (112) are respectively fixedly mounted on one side of the inner side wall of the annular cavity (227). The two ends of the middle section are respectively arranged opposite to the two sliding straight racks (111). The top surfaces of the two extrusion tables (112) are respectively provided with sliding grooves (116). One end of the two elastic arc strips (113) is fixedly installed at the end of the two sliding straight racks (111) away from the bevel gear (104). The middle part of the two elastic arc strips (113) is slidably installed in the two sliding grooves (116). The other end of the two elastic arc strips (113) is fixedly connected to the two sliding plates (114), and one end of the two elastic arc strips (113) is slidably installed in the sliding extrusion groove (220).

2. The vehicle-mounted PTC water heater according to claim 1, characterized in that: Each heating module (26) includes an alumina ceramic shell (261) and a heating unit (262). The top surface of the alumina ceramic shell (261) is recessed with a unit mounting groove (263). The heating unit (262) is fixedly installed in the unit mounting groove (263) by thermally conductive adhesive. The heating unit (262) includes a positive electrode plate (264), a PTC ceramic resistor (265) and a negative electrode plate (266). One side wall of the positive electrode plate (264) is fixedly connected to one side wall of the PTC ceramic resistor (265) by thermally conductive adhesive. One side wall of the negative electrode plate (266) is fixedly connected to the other side wall of the PTC ceramic resistor (265) by thermally conductive adhesive. The thermally conductive adhesive is an organosilicon adhesive that can withstand 250℃ for a long time and has a thermal conductivity of >1.5W.

3. The vehicle-mounted PTC water heater according to claim 2, characterized in that: The control assembly (30) includes an adapter plate (31), a control plate (32), the aforementioned high-voltage connector (33), low-voltage connector (34), and a top cover (35). A sealing ring (352) is protruding from the bottom periphery of the top surface of the top cover (35). The bottom of the sealing ring (352) is fixedly installed on the top periphery of the fixed mounting part (221). An upper mounting groove is recessed from the bottom surface of the top cover (35). The adapter plate (31) and the control plate (32) are installed in the upper mounting groove, and the control plate (32) is electrically connected to the adapter plate (31). A mounting platform (353) is protruding from the side wall of the top cover (35) near the docking part (222). The low-voltage connector (34) is fixedly installed on the side wall of the mounting platform (353), and the low-voltage connector (34) is electrically connected to the control plate (32).

4. The vehicle-mounted PTC water heater according to claim 3, characterized in that: The negative electrode plate (266) has a negative electrode tab (267) protruding from one end of its top surface, and the positive electrode plate (264) has a positive electrode tab (268) protruding from the end of its top surface away from the negative electrode tab (267). The adapter plate (31) is made of conductive material. The bottom surface of the adapter plate (31) is recessed with multiple negative electrode tab docking grooves (311) and multiple positive electrode tab docking grooves (312). The negative electrode tabs (267) and positive electrode tabs (268) of multiple heating modules (26) are fixedly installed in the multiple negative electrode tab docking grooves (311) and multiple positive electrode tab docking grooves (312) by soldering. The top surface of the adapter plate (31) has multiple connecting terminals (313) protruding along its length. Each connecting terminal (313) is electrically connected to multiple heating modules (26) in series, and each connecting terminal (313) is connected in series with a different number of multiple heating modules (26).

5. The vehicle-mounted PTC water heater according to claim 4, characterized in that: Multiple IGBT chips (321) are protruding on one side of the bottom surface of the control board (32). The IGBT chips (321) are used to control the opening and closing of the connection terminals (313). The bottom of the IGBT chips (321) is fixedly installed on the top of the alumina ceramic shell (261) by thermally conductive adhesive. Multiple terminal docking grooves (322) are recessed through one side of the middle of the bottom surface of the control board (32). Multiple connection terminals (313) are installed in the multiple terminal docking grooves (322).

6. The vehicle-mounted PTC water heater according to claim 5, characterized in that: The gaps between the multiple alumina ceramic shells (261) interspersed on the lower bottom shell (21) and the fixed aluminum shell (22) and the fixed aluminum shell (22) are filled with potting compound (28).

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