Automotive ptc liquid heater

Abstract

The utility model discloses a kind of automobile PTC liquid heaters, including heating pedestal, water tank and PTC heating assembly, multiple PTC containing parts are distributed on heating pedestal, PTC containing part is equipped with PTC containing cavity, PTC containing cavity has two opposite heat conducting surfaces, PTC heating assembly is set in PTC containing cavity, PTC heating assembly has two heating surfaces, heating surface is respectively opposite with the heat conducting surface on corresponding position, one of heating surface and heat conducting surface is equipped with heat-conducting wedge, PTC heating assembly is coated with heat-conducting U-shaped piece.Compared with prior art, by setting heat-conducting U-shaped piece and heat-conducting wedge, the addition of existing heat-conducting silicone grease is replaced, only need to be pressed into wedge to complete the fastening of PTC heating assembly, improve production efficiency, U-shaped piece and wedge are used as heat-conducting medium simultaneously, without using heat-conducting silicone grease, can more efficiently conduct heat, avoid the problem that power is unstable due to uneven addition of heat-conducting silicone grease and reduce production cost.

Description

Technical Field

[0001] This utility model relates to a PTC heater, and more particularly to an automotive PTC liquid heater. Background Technology

[0002] With the rapid development of the new energy vehicle market, the demand for PTC liquid heaters, as a core component of vehicle heating systems, is increasing daily. However, the current methods of fastening components in PTC heaters have significant drawbacks:

[0003] 1. Insufficient mechanical stability: Traditional fastening methods can easily generate excessive non-uniform compressive force on the PTC heating element and its electrode plates during installation or under vibration conditions, leading to cracking of the PTC heating element, deformation or damage of the electrode plates, which seriously affects the reliability and lifespan of the product.

[0004] 2. Heat efficiency loss: The existing structure has contact thermal resistance between the PTC heating element and the heat sink, resulting in poor heat conduction path. As a result, the generated heat cannot be efficiently carried away by the coolant, causing a decrease in overall heat exchange efficiency.

[0005] 3. Structural and installation complexity: Existing fastening devices often require the addition of thermally conductive silicone grease to the mounting slots of cast aluminum parts, which not only increases production costs but also causes inconvenience for on-site installation and maintenance. Utility Model Content

[0006] The purpose of this utility model is to provide an automotive PTC liquid heater, and the technical problems to be solved are to improve the heat conduction effect, reduce the production cost, and improve the production efficiency.

[0007] To solve the above problems, the present invention adopts the following technical solution: an automotive PTC liquid heater, comprising a heating base, a water tank, and a PTC heating assembly. The heating base has multiple PTC receiving portions protruding from the heating base. Each PTC receiving portion has a PTC receiving cavity. A water passage gap is provided between two adjacent PTC receiving portions. The PTC receiving cavity has two opposing heat-conducting surfaces. The PTC heating assembly is disposed in the PTC receiving cavity. The PTC heating assembly has two heating surfaces, which are respectively opposite to the heat-conducting surfaces at corresponding positions. A heat-conducting wedge block is provided between one of the heating surfaces and the heat-conducting surface to press and fix the PTC heating assembly in the PTC receiving cavity. The PTC heating assembly is covered with a heat-conducting U-shaped component. The PTC receiving portion is disposed in the water tank.

[0008] Furthermore, the PTC heating assembly includes a PTC heating element, electrode plates disposed on two heating surfaces of the PTC heating element, and a thermally conductive silicone sheet covering the two electrode plates, with a U-shaped component disposed outside the thermally conductive silicone sheet.

[0009] Furthermore, the PTC heating element is provided in multiple forms, arranged in a rectangular array, with electrode plates covering all PTC heating elements.

[0010] Furthermore, the cross-section of the wedge block is trapezoidal.

[0011] Furthermore, the wedge is made of aluminum.

[0012] Furthermore, the U-shaped component is formed by bending a sheet-like structure.

[0013] Furthermore, the U-shaped component is made of aluminum.

[0014] Compared with the prior art, this utility model replaces the addition of existing thermal grease by setting up a thermally conductive U-shaped component and a thermally conductive wedge block. The PTC heating component can be fastened simply by pressing in the wedge block, which improves production efficiency. At the same time, by using the U-shaped component and the wedge block as thermal conductive medium, there is no need to use thermal grease, which can conduct heat more efficiently, avoid the problem of unstable power caused by uneven addition of thermal grease, and reduce production costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of this utility model.

[0016] Figure 2 This is an exploded view of the present invention.

[0017] Figure 3 This is a schematic diagram of the heating base of this utility model.

[0018] Figure 4 This is a cross-sectional view of the heating base of this utility model.

[0019] Figure 5 This is a partial enlarged view of the heating base of this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0021] like Figures 1 to 5As shown, this utility model discloses an automotive PTC liquid heater, including a water tank 6 with a water cavity. The water tank 6 has an inlet and an outlet, which are uniformly connected to the water cavity. The water tank 6 has an opening exposing the water cavity, and a top cover 7 is provided on the opening. A heating base 1 is provided inside the water tank 6, and the heating base 1 is fastened to the opening and sealed to it. Multiple PTC receiving portions 3 protruding from the heating base 1 are distributed on the heating base 1, and the PTC receiving portions 3 are placed in the water cavity. The heating base 1 has an opening for assembling a PTC heating assembly 2, and the PTC receiving portions 3 have an assembly port in this opening. The PTC heating component 2 is assembled into the PTC receiving cavity 31 of the PTC receiving part 3. The upper cover 7 is sealed and fixed to the opening on the heating base 1. A water passage gap is provided between two adjacent PTC receiving parts 3. The PTC receiving cavity 31 has two opposing heat-conducting surfaces 32. The PTC heating component 2 has two heating surfaces 21. The heating surfaces 21 are opposite to the heat-conducting surfaces 32 at corresponding positions. A heat-conducting wedge block 4 is provided between one of the heating surfaces 21 and the heat-conducting surface 32 to press and fix the PTC heating component 2 in the PTC receiving cavity 31. The PTC heating component 2 is covered with a heat-conducting U-shaped part 5.

[0022] During assembly, the PTC heating component 2, covered with the U-shaped part 5, is first assembled into the PTC receiving cavity 31 through the assembly port. Then, the wedge block 4 is pressed in from one of the heat-conducting surfaces 32, so that it is placed between the heat-conducting surface 32 and the surface of the U-shaped part 5 located on that side. The PTC heating component 2 is then fastened in the PTC receiving cavity 31, so that there is no gap between the heat-conducting surface 32 and the heating surface 21. Using the U-shaped part 5 and the wedge block 4 as heat-conducting medium, traditional thermal grease is not used, which can conduct heat more efficiently, avoid the problem of unstable power caused by uneven addition of thermal grease, and reduce production costs. At the same time, it saves time and improves production efficiency. The U-shaped part 5 is set outside the PTC heating component 2 as protection to prevent damage to the PTC heating component 2 when the wedge block 4 is pressed in.

[0023] like Figure 3 , Figure 4 and Figure 5 As shown, the PTC heating assembly 2 includes a PTC heating element 24, electrode plates 22 disposed on the two heating surfaces of the PTC heating element 24, and a thermally conductive silicone sheet 23 covering the two electrode plates 22. The U-shaped part 5 is disposed outside the thermally conductive silicone sheet 23. The use of the thermally conductive silicone sheet can fill the micro-assembly gap between the electrode plate and the surface of the U-shaped part 5, and can minimize the contact thermal resistance.

[0024] The U-shaped part 5 is formed by bending a sheet of sheet material, which is made of aluminum.

[0025] like Figure 3As shown, there are multiple PTC heating elements 24 arranged in a rectangular array and laid flat between two electrode plates 22 so that the electrode plates 22 cover all PTC heating elements 24.

[0026] In this invention, the wedge block 4 has a trapezoidal cross-section to match the inclined arrangement of the heat-conducting surfaces 32 on both sides of the PTC cavity 31, ensuring that the PTC heating element 2 is tightly pressed and fixed within the PTC cavity 31. The wedge block 4 has a plate-like structure, and its surface area is adapted to the heat-conducting surfaces 32 of the PTC cavity 31. A uniform radial clamping force is applied to the internal heat-conducting silicone sheet and PTC heating element to achieve both fastening and heat conduction. The wedge block 4 is made of aluminum to ensure good thermal conductivity.

[0027] This utility model has the following significant advantages:

[0028] High protection and stability: By utilizing the elastic deformation of the U-shaped part and the buffer of the thermally conductive silicone sheet, and using the progressive clamping of the wedge block, uniform force is applied to the PTC heating element from all directions, completely avoiding stress concentration problems and effectively preventing the PTC heating element from breaking and the electrode sheet from deforming.

[0029] Significantly improved thermal conductivity: The thermally conductive silicone pad perfectly fills all microscopic assembly gaps, greatly reducing contact thermal resistance; the U-shaped parts and wedges are made of aluminum with a high thermal conductivity coefficient, providing an effective thermal conduction area to efficiently guide heat to the external cooling system, greatly improving the overall heat exchange performance of the product.

[0030] Simple structure, easy to manufacture and install: The entire fastening structure consists of only three core parts (thermal conductive silicone sheet, U-shaped part, and wedge block), making it extremely simple, easy to process and manufacture, and inexpensive. The assembly process is simplified; all fastening and heat conduction work can be completed simply by pressing the wedge block in, greatly improving production efficiency.

Claims

1. A PTC liquid heater for automobiles, comprising a heating base (1), a water tank (6), and a PTC heating assembly (2), characterized in that: The heating base (1) has a plurality of PTC receiving parts (3) protruding from the heating base (1). The PTC receiving parts (3) are provided with PTC receiving cavities (31). A water passage gap is provided between two adjacent PTC receiving parts (3). The PTC receiving cavity (31) has two opposing heat-conducting surfaces (32). The PTC heating component (2) is set in the PTC receiving cavity (31). The PTC heating component (2) has two heating surfaces (21). The heating surfaces (21) are opposite to the heat-conducting surfaces (32) at corresponding positions. A heat-conducting wedge block (4) is provided between one of the heating surfaces (21) and the heat-conducting surface (32) to press and fix the PTC heating component (2) in the PTC receiving cavity (31). The PTC heating component (2) is covered with a heat-conducting U-shaped part (5). The PTC receiving parts (3) are located in the water tank (6).

2. The automotive PTC liquid heater according to claim 1, characterized in that: The PTC heating assembly (2) includes a PTC heating element (24), electrode plates (22) disposed on the two heating surfaces of the PTC heating element (24), and a thermally conductive silicone sheet (23) covering the two electrode plates (22). The U-shaped part (5) is disposed outside the thermally conductive silicone sheet (23).

3. The automotive PTC liquid heater according to claim 2, characterized in that: The PTC heating element (24) is provided in multiple ways and arranged in a rectangular array, with the electrode plate (22) covering all PTC heating elements (24).

4. The automotive PTC liquid heater according to claim 3, characterized in that: The cross-section of the wedge block (4) is trapezoidal.

5. The automotive PTC liquid heater according to claim 4, characterized in that: The wedge (4) is made of aluminum.

6. The automotive PTC liquid heater according to any one of claims 1-5, characterized in that: the U-shaped member (5) is formed by bending a sheet structure.

7. The automotive PTC liquid heater according to claim 6, characterized in that: The U-shaped part (5) is made of aluminum.

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