PTC (Positive Temperature Coefficient) water heater with thin-wall heating shell

Abstract

The invention discloses a thin-wall heating shell PTC water heater which comprises a heating bag positive electrode, a heating bag, a plurality of heating shells, a base, a water channel shell, a heating bag negative electrode and a compartment, the water channel shell is fixedly connected with the base in a sealed mode, the compartment is fixedly arranged on the base, the compartment is provided with a plurality of heating shell welding positions, and the heating shell welding positions are welded to the heating bag positive electrode. A plurality of heating shells are fixedly arranged on the plurality of heating shell welding positions, the plurality of heating shells are arranged in a staggered mode to form at least two channels used for heating water or cooling liquid, the heating bags are arranged in the heating shells, and the heating bag positive electrodes and the heating bag negative electrodes are installed on the heating bags.

Description

Technical Field

[0001] The invention relates to a thin-wall heating shell PTC water heater, belonging to the technical field of new energy water heating. Background Art

[0002] The PTC water heater is a device that converts electrical energy into thermal energy after the PTC ceramic piece is energized to heat water or coolant. The device is generally used in new energy vehicles, energy storage and other industries. It is mainly used to provide heat to the terminal to keep the terminal product within a certain temperature range. The PTC water heater used in the early stage is generally composed of a water channel shell, a thermal conductive base, a heating pack and some auxiliary standard parts. The thermal conductive base on the market is generally formed by high-pressure die-casting and die-casting of the heating cavity. The disadvantage is that the wall thickness of the heating cavity is relatively thick, 2mm~3.5mm, and the thermal resistance of the heating cavity is relatively high. The base is metal high-pressure die-casting, which is prone to defects such as cold shut and cavitation, and the cost of mold development and mold repair is relatively high. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve the problems of the current PTC water heater, the large wall thickness of the heating shell, the high thermal resistance and the subsequent maintenance cost, and to provide a PTC water heater with a thin-walled heating shell, which improves the heating efficiency and reduces the cost, and makes the product lightweight and easy to popularize.

[0004] Preferably, the present invention provides a thin-walled heating shell PTC water heater, comprising a heating pack positive electrode, a heating pack, multiple heating shells, a base, a water channel shell, a heating pack negative electrode and a compartment, the water channel shell is sealingly and fixedly connected to the base, the compartment is fixedly arranged on the base, a plurality of heating shell welding positions are provided on the compartment, a plurality of heating shells are fixedly arranged on the plurality of heating shell welding positions, the plurality of heating shells are staggered to form at least two channels for heating water or coolant, the heating pack is arranged inside the heating shell, and the heating pack positive electrode and the heating pack negative electrode are installed on the heating pack.

[0005] Preferably, the plurality of heating shells each include a plurality of thin walls, which are sealed and fixedly connected to each other to form a heating pack chamber for accommodating the heating pack, and the thickness of the thin walls is 0.2-0.6 mm.

[0006] Preferably, it includes a heating shell flange, and multiple heating shell through holes for placing the heating packs are opened on one side of the heating shell, and the heating shell through holes are fixedly provided with the heating shell flanges, and the length of the heating shell flanges is greater than the length of the heating pack through holes or the width of the heating shell flanges is greater than the width of the heating pack through holes.

[0007] Preferably, it comprises a plurality of product installation columns, and the plurality of product installation columns are fixedly arranged on the base.

[0008] Preferably, a sealing ring is included, a plurality of water channel cavities are provided in the water channel housing, a housing sealing ring groove matching the sealing ring is provided on the water channel cavity, the base is sealed and fixedly connected to the water channel cavity through the sealing ring, and a water inlet for water inlet to the heating housing and a water outlet for water outlet from the heating housing are provided on the water channel cavity, Preferably, it comprises a plurality of shell fixing columns, the base is fixedly connected to the plurality of shell fixing columns, and the plurality of shell fixing columns are fixedly connected to the water channel cavity.

[0009] Preferably, it comprises a front cover plate and front cover plate clamping feet, a plurality of cover plate grooves are provided on the base, a plurality of front cover plate clamping feet are fixedly provided on the front cover plate, and the plurality of front cover plate clamping feet are engaged with the cover plate grooves.

[0010] Preferably, it comprises an IGBT device, a plurality of base cover plate clamping pins, and a base cover plate, wherein the IGBT device is fixedly arranged on the PCBA control board.

[0011] Preferably, it comprises a grounding position and a controller fixing column, and the grounding position and the controller fixing column are fixedly arranged on the base.

[0012] Preferably, it includes a high-voltage plug-in machine installation position, a PCBA control board, a low-voltage connector fixing position, a wire threading groove, a welding position and a base base. The base is provided with a low-voltage connector fixing position, the base is provided with the wire threading groove, the heating shell flange is welded at the welding position, the high-voltage plug-in machine installation position is fixedly set on the base base, and the base cover fixes the PCBA control board on the base base through a plurality of base cover clamping feet.

[0013] The beneficial effects achieved by the present invention are: The present invention mainly adopts the method of separate processing of the die-casting base and the heating shell. The base is die-cast, and the heating shell is formed by stamping or cold extrusion. The thickness of the heating shell is between 0.2 and 0.6 mm. The base and the thin-walled heating shell are welded and combined by laser welding, thereby realizing the thin-walled form of the overall base. The heating pack is then pressed into the thin-walled heating shell. Since the wall thickness of the heating shell is thin, the thermal resistance is reduced, and the heat generated by the heating pack is fully transmitted to the liquid flowing through the back of the heating shell. This makes the liquid heat up faster, reduces the loss of electric energy, and improves the heating efficiency.

[0014] In the present invention, since the heating shell and the base are processed separately and the wall thickness of the heating shell is relatively thin, the thermal resistance generated is reduced, so that the heat generated by the heating pack is completely transferred to the water flowing through the back of the heating shell, so that the heat is completely transferred to the flowing medium, thereby improving the overall heating efficiency of the product. Since the wall thickness of the heating shell is relatively thin, the weight is reduced compared with the commonly used one-piece die-casting, and the mold development can more easily avoid defects such as cold insulation holes in key positions, and the cost is low, the weight is light, and it is easy to popularize and promote.

[0015] The present invention is mainly aimed at a single thin-walled heating shell, which uses its own thin-walled structure to reduce thermal resistance and then conducts heat to the liquid flowing through the heating hole through the heat generated by the heating pack, thereby heating the liquid and achieving rapid temperature rise of the liquid. The sealing performance of the cover is improved by using a base sealing ring, and the base is injection molded, which reduces heat loss and improves the safety performance of the electrical appliance. Because the heating shell is a thin-walled structure, it also reduces the weight of the entire heating device, which is convenient for popularization and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 is an exploded view of some embodiments of the present application; Figure 2 are cross-sectional views of some embodiments of the present application; Figure 3 It is a structural diagram of installing a heating package in some embodiments of the present application; Meaning of the reference numerals: 1. front cover; 2. front cover foot; 3. positive electrode of heating pack; 4. heating pack; 5. heating shell; 6. flange of heating shell; 7. cover groove; 8. base; 9. shell sealing ring groove; 10. water channel cavity; 11. water inlet; 12. water outlet; 13. water channel shell; 14. shell fixing column; 15. sealing ring; 16. product installation column; 17. welding position of heating shell; 18. installation position of high-voltage plug-in machine; 19. I GBT device; 20. Base cover clamp; 21. Base cover; 22. PCBA control board; 23. Heat pack negative pole; 24. Compartment; 25. Heat pack back; 26. Grounding position; 27. Controller fixing column; 28. Thin wall; 29. ​​Heat pack back; 30. Low-voltage connector fixing position; 31. Wire threading groove; 32. Welding position; 33. Heat pack body; 34. Identification area; 35. Product installation group back; 36. Base. DETAILED DESCRIPTION

[0018] If the descriptions of "first" and "second" etc. are involved in the present invention, they are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] See also Figure 1 The present application provides a thin-walled heating shell PTC water heater, comprising a heating pack positive electrode 3, a heating pack 4, a plurality of heating shells 5, a base 8, a water channel shell 13, a heating pack negative electrode 23 and a compartment 24, wherein the water channel shell 13 is sealed and fixedly connected to the base 8, the compartment 24 is fixedly arranged on the base 8, a plurality of heating shell welding positions 17 are provided on the compartment 24, a plurality of heating shells 5 are fixedly arranged on the plurality of heating shell welding positions 17, the plurality of heating shells 5 are staggered to form at least two channels for heating water or coolant, the heating pack 4 is arranged inside the heating shell 5, the heating pack positive electrode 3 and the heating pack negative electrode 23 are installed on the heating pack 4. The present invention mainly adopts the method of separate processing of the die-casting base and the heating shell. The base is die-cast, and the heating shell is formed by stamping or cold extrusion. The thickness of the heating shell is between 0.2 and 0.6 mm. The base and the thin-walled heating shell are welded together by laser welding, thereby realizing the thin-walled form of the overall base. The heating pack is then pressed into the thin-walled heating shell. Since the wall thickness of the heating shell is thin, the thermal resistance is reduced, and the heat generated by the heating pack is all transmitted to the liquid flowing through the back of the heating shell. Thereby, the liquid is heated faster, the loss of electric energy is reduced, and the heating efficiency is improved. The heating shell 5 includes a plurality of rectangular-shaped, hollow shells, and the shell is composed of a thin wall 28. The waterway shell 13 is a box body with a base receiving groove for matching the base 8 on one side, and the compartment 24 is a flat plate.

[0020] In the embodiment of the present application, the plurality of heating shells 5 each include a plurality of thin walls 28, and the plurality of thin walls 28 are sealed and fixedly connected to each other to form a heating pack chamber for accommodating the heating pack 4, and the thickness of the thin wall 28 is 0.2-0.6 mm, and the thin wall 28 is a flat metal plate. Since the heating shell and the base are processed separately, and the wall thickness of the heating shell is relatively thin, the thermal resistance generated is reduced, so that the heat generated by the heating pack is completely transferred to the water flowing through the back of the heating shell, so that the heat is completely transferred to the flowing medium, and the overall heating efficiency of the product is improved. Since the wall thickness of the heating shell is relatively thin, the mass is reduced compared with the commonly used one-piece die casting, and the mold development is easier to avoid defects such as cold isolation holes in key positions, and the cost is low, the mass is relatively light, and it is easy to popularize and promote.

[0021] In the embodiment of the present application, a heating shell flange 6 is included, and a heating pack through hole for placing the heating pack 4 is opened on one side of the plurality of heating shells 5. The heating shell flange 6 is fixedly arranged on the heating pack through hole. The length of the heating shell flange 6 is greater than the length of the heating pack through hole or the width of the heating shell flange 6 is greater than the width of the heating pack through hole. The heating shell flange 6 is used to ensure that the plurality of heating shells 5 are firmly engaged on the base 8 and will not detach from the base 8.

[0022] In the embodiment of the present application, a plurality of product installation columns 16 are included. The plurality of product installation columns 16 are fixedly disposed on the base 8 , and the product installation columns 16 are columnar rods.

[0023] In the embodiment of the present application, a sealing ring 15 is included, a plurality of water channel cavities are provided in the water channel housing, a housing sealing ring groove 9 matching the sealing ring 15 is provided on the water channel cavity 10, the base 8 is sealed and fixedly connected to the water channel cavity 10 through the sealing ring 15, and a water inlet 11 for water inlet to the heating housing 5 and a water outlet 12 for water outlet from the heating housing 5 are provided on the water channel cavity 10. In the embodiment of the present application, a plurality of outer shell fixing columns 14 are included, the base 8 is fixedly connected to the plurality of outer shell fixing columns 14, the plurality of outer shell fixing columns 14 are fixedly connected to the water channel cavity 10, the plurality of outer shell fixing columns 14 are columnar rods with screw holes, and the outer shell fixing columns 14 and the water channel outer shell 13 are integrally cast.

[0024] In the embodiment of the present application, it includes a front cover plate 1 and a front cover plate foot 2, a plurality of cover plate grooves 7 are provided on the base 8, a plurality of front cover plate foots 2 are fixedly provided on the front cover plate 1, a plurality of the front cover plate foots 2 are engaged with the cover plate grooves 7, the front cover plate 1 is a flat plate, and the front cover plate foots 2 are rectangular plates.

[0025] In the embodiment of the present application, an IGBT device 19, a plurality of base cover plate clamping feet 20, and a base cover plate 21 are included. The IGBT device 19 is fixedly arranged on the PCBA control board 22, and the base cover plate clamping feet 20 and the base cover plate 21 are plate materials.

[0026] In the embodiment of the present application, a grounding position 26 and a controller fixing column 27 are included. The grounding position 26 and the controller fixing column 27 are fixedly arranged on the base 8. The grounding position 26 is a columnar rod, and the controller fixing column 27 is a columnar rod.

[0027] In the embodiment of the present application, it includes a high-voltage plug-in machine installation position 18, a PCBA control board 22, a low-voltage connector fixing position 30, a threading groove 31, a welding position 32 and a base base 36. The base 8 is provided with a low-voltage connector fixing position 30, the base 8 is provided with the threading groove 31, the heating shell flange 6 is welded at the welding position 32, the high-voltage plug-in machine installation position 18 is fixedly set on the base base 36, the high-voltage plug-in machine installation position 18, the low-voltage connector fixing position 30, and the threading groove 31 are a groove, the base base 36 is a flat plate material, and the base cover 21 fixes the PCBA control board 22 on the base base 36 through a plurality of base cover clamping feet 20.

[0028] The back body 25 of the heating shell is the back of the heating shell, the back of the heating pack 29 is the back of the heating pack, the welding position 32 is the position for welding the flange of the heating shell, the heating pack 4 and the heating shell 5 are combined to form a heating pack body 33, the identification area 34 is used to affix some labels for identification information, and the product installation column 16 is installed on the back 35 of the product installation group.

[0029] There are many models of heating pack positive electrode 3, sealing ring 15, heating pack negative electrode 23, heating pack 4, IGBT device 19, PCBA control board 22 that can be used in the prior art. Those skilled in the art can choose according to actual needs, and no examples are given in this embodiment.

[0030] The heating shell 5 is formed by stamping, cold extrusion and other methods to form a single body with a wall thickness of 0.3~0.6mm. The heating pack is inserted into the heating core hole of the heating shell 5 and pressed tightly. The installed heating core is installed on the base 8 obtained by injection molding using standard parts. Then, after all aspects are installed, water is passed into the water inlet. When water flows through the thin-walled heating core, it takes away the heat, thereby heating other products.

[0031] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0032] Those skilled in the art will readily appreciate other embodiments of the invention after considering the specification and practicing the invention invented herein. This application is intended to cover any variations, uses or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are intended to be exemplary only, and the true scope and spirit of the invention are indicated by the claims.

[0033] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", "connected", and "matched" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two elements, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments of the present invention, only the structures involved in the embodiments of the present invention are involved, and other structures can refer to the general design; the above specific implementation methods further explain the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above are only specific implementation methods of the present application and are not used to limit the protection scope of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the present application should be included in the protection scope of the present application.

Claims

1. A thin-walled heating shell PTC water heater, characterized in that: The invention comprises a heating pack positive electrode (3), a heating pack (4), a plurality of heating shells (5), a base (8), a water channel shell (13), a heating pack negative electrode (23) and a compartment (24); the water channel shell (13) is sealed and fixedly connected to the base (8); the compartment (24) is fixedly arranged on the base (8); a plurality of heating shell welding positions (17) are provided on the compartment (24); a plurality of heating shells (5) are fixedly arranged on the plurality of heating shell welding positions (17); the plurality of heating shells (5) are staggered to form at least two channels for heating water or cooling liquid; the heating pack (4) is arranged inside the heating shell (5); the heating pack positive electrode (3) and the heating pack negative electrode (23) are mounted on the heating pack (4).

2. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: The plurality of heating shells (5) each comprises a plurality of thin walls (28), the plurality of thin walls (28) being sealed and fixedly connected to each other to form a heating pack chamber for accommodating the heating pack (4), the thickness of the thin walls (28) being 0.2-0.6 mm.

3. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: It comprises a heating shell flange (6), a heating pack through hole for receiving the heating pack (4) is provided on one side of the plurality of heating shells (5), the heating shell flange (6) is fixedly arranged on the heating pack through hole, the length of the heating shell flange (6) is greater than the length of the heating pack through hole or the width of the heating shell flange (6) is greater than the width of the heating pack through hole.

4. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: It comprises a plurality of product installation columns (16), wherein the plurality of product installation columns (16) are fixedly arranged on the base (8).

5. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: The water channel housing (13) comprises a plurality of water channel cavities (10), a housing sealing ring groove (9) matching the sealing ring (15) is provided on the water channel cavity (10), the base (8) is sealed and fixedly connected to the water channel cavity (10) via the sealing ring (15), and the water channel cavity (10) is provided with a water inlet (11) for water to enter the heating housing (5) and a water outlet (12) for water to exit the heating housing (5).

6. A thin-walled heating shell PTC water heater according to claim 5, characterized in that: It comprises a plurality of outer shell fixing columns (14), the base (8) being fixedly connected to the plurality of outer shell fixing columns (14), and the plurality of outer shell fixing columns (14) being fixedly connected to the water channel cavity (10).

7. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: It comprises a front cover plate (1) and front cover plate clamping feet (2), wherein a plurality of cover plate grooves (7) are provided on the base (8), a plurality of front cover plate clamping feet (2) are fixedly arranged on the front cover plate (1), and a plurality of the front cover plate clamping feet (2) are clamped in the cover plate grooves (7).

8. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: It comprises an IGBT device (19), a plurality of base cover plate clamping feet (20), and a base cover plate (21); the IGBT device (19) is fixedly arranged on the PCBA control board (22).

9. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: It comprises a grounding position (26) and a controller fixing column (27), wherein the grounding position (26) and the controller fixing column (27) are fixedly arranged on the base (8).

10. A thin-walled heating shell PTC water heater according to claim 1, characterized in that: The invention comprises a high-voltage plug-in machine installation position (18), a PCBA control board (22), a low-voltage connector fixing position (30), a wire threading groove (31), a welding position (32) and a base base (36); the base (8) is provided with a low-voltage connector fixing position (30); the base (8) is provided with the wire threading groove (31); the heating shell flange (6) is welded at the welding position (32); the high-voltage plug-in machine installation position (18) is fixedly arranged on the base base (36); the base cover (21) fixes the PCBA control board (22) on the base base (36) through a plurality of base cover clamping feet (20).

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