Water heating PTC heater and assembling method thereof

Abstract

The application provides a water heating PTC heater, which comprises an upper shell, a lower shell, a water-proof plate and a heating assembly. The upper shell and the lower shell are separated by the water-proof plate, and an upper water chamber and a lower water chamber are formed in the upper shell and the lower shell respectively. The same end of the upper water chamber and the lower water chamber is respectively provided with a water outlet on the upper shell and a water inlet on the lower shell, and the other end of the upper water chamber and the lower water chamber is communicated with respect to the end with the water outlet and the water inlet. The heating assembly has a circuit board and a plurality of PTC heating blocks connected with the circuit board. Each PTC heating block penetrates through the upper shell and the water-proof plate and is partially located in the upper water chamber and partially located in the lower water chamber. The application also provides an assembling method of the water heating PTC heater. The water heating PTC heater of the application can better utilize the PTC heating blocks through a double-flow design, so that the heater has a better use effect.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning component technology, and in particular to a water-cooled PTC heater. Furthermore, this invention also relates to an assembly method for the water-cooled PTC heater. Background Technology

[0002] With fuel supply and demand and environmental pollution becoming increasingly prominent issues, countries worldwide are promoting the development of new energy vehicles. In traditional automobiles, the internal combustion engine converts internal energy into kinetic energy through fuel combustion and expansion, resulting in low conversion efficiency and significant waste heat. Therefore, the heat source used for heating is generally the waste heat from the internal combustion engine. This heating system makes efficient use of previously useless waste heat, but it also means that heating can only be provided when the internal combustion engine is running. Since pure electric vehicles do not have internal combustion engines, and hybrid vehicles also require heating in pure electric mode, the use of PTC heaters for heating has become the choice of most new energy vehicle manufacturers.

[0003] PTC heaters used for heating in new energy vehicles are generally divided into two types: air-cooled and water-cooled. Air-cooled systems use a PTC heater to directly heat the air, which is then blown into the vehicle by a fan. Water-cooled systems use a PTC heater to heat the coolant through specialized equipment, and then deliver warm air into the vehicle through a heater core. Compared to air-cooled systems, which are simpler in structure and heat up quickly, water-cooled systems offer stable and gentler temperatures, and the heated coolant can also heat the battery, resulting in better performance. Therefore, the design and development of water-cooled PTC heaters has become an important research and development direction for automakers. Summary of the Invention

[0004] In view of this, the present invention aims to provide a water-heating PTC heater that can provide a water-heating PTC heater with better performance.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A water-cooled PTC heater includes an upper shell, a lower shell, a water baffle plate, and a heating assembly, wherein:

[0007] The upper shell and the lower shell are separated by the baffle plate, and an upper water chamber and a lower water chamber are formed in each of them respectively;

[0008] The upper water chamber and the lower water chamber are respectively provided with a water outlet on the upper shell and a water inlet on the lower shell at the same end, and the other ends of the upper water chamber and the lower water chamber are connected relative to the end with the water outlet and the water inlet;

[0009] The heating assembly has a circuit board and a plurality of PTC heating blocks connected with the circuit board, each of the PTC heating blocks is arranged through the upper shell and the water baffle, and partially located in the upper water chamber and partially located in the lower water chamber.

[0010] Further, one end of the water baffle is provided with a water passing hole; the upper water chamber and the lower water chamber are communicated through the water passing hole.

[0011] Further, the plurality of PTC heating blocks are arranged in multiple rows; in each row of the PTC heating blocks, adjacent PTC heating blocks are arranged in staggered manner.

[0012] Further, the water heating PTC heater further comprises an electric appliance box; the electric appliance box is fixedly connected with the upper shell and the lower shell through a mounting support.

[0013] Further, the top of the upper shell is fixedly connected with a main plate; the circuit board is fixed on the main plate, each of the PTC heating blocks is arranged through the main plate; and the main plate is provided with a sealing cover for covering the circuit board.

[0014] Further, the water heating PTC heater further comprises a water inlet temperature sensor and a water outlet temperature sensor; the water inlet temperature sensor is arranged through the main plate, the upper shell and the water baffle into the lower water chamber and close to the water inlet; and the water outlet temperature sensor is arranged through the main plate and the upper shell into the upper water chamber and close to the water outlet.

[0015] Further, each of the PTC heating blocks is provided with a waterproof pipe; the waterproof pipe is arranged through the main plate, the upper shell and the water baffle, and two ends of the waterproof pipe are connected with the main plate and the lower shell respectively.

[0016] Further, the inner wall of the lower shell is provided with a plurality of connecting protrusions, each of the connecting protrusions is arranged corresponding to the waterproof pipe; one end of each of the waterproof pipes is sleeved on the corresponding connecting protrusion and fixedly connected with the connecting protrusion.

[0017] Further, the water inlet and the water outlet are respectively riveted on the lower shell and the upper shell; the main plate and the upper shell, and the upper shell, the water baffle and the lower shell are fixedly connected through rivets respectively; the main plate and the connecting protrusions and the waterproof pipes, the upper shell, the water baffle and the lower shell, and the water inlet and the lower shell and the water outlet and the upper shell are respectively sealed through brazing.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The water heating PTC heater can heat the cooling liquid flowing through by the heat generated by the PTC heating blocks in the heating assembly, and can realize the water heating mode.

[0020] Meanwhile, by arranging the water inlet and the water outlet on the same end of the lower shell and the upper shell respectively, and arranging the upper water chamber and the lower water chamber in communication at the other end, the overall heater can realize the double-flow design of the cooling liquid flowing through. Moreover, the cooling liquid (with the lowest and highest water temperature) at one end of the water inlet and the water outlet is heated by the same PTC heating block, and the cooling liquid with similar water temperature at the other end is also heated by the same PTC heating block, so that each PTC heating block can be better utilized, and the heating is faster, so as to improve the heating efficiency of the heating assembly, and further improve the use effect of the heater.

[0021] In addition, the cooling liquid flow channel is directly formed by the upper shell and the lower shell, so that the volume of the cooling liquid flow channel can be increased, the heat exchange area can be increased, the flow resistance can be reduced, and the overall size of the heater can be reduced.

[0022] The application also provides an assembling method of the water heating PTC heater.

[0023] The water outlet and the main plate are riveted to the upper shell respectively, and the water inlet and the lower shell are riveted;

[0024] The upper shell, the water baffle and the lower shell are stacked together;

[0025] Each waterproof pipe is inserted through the main plate, the upper shell and the water baffle, and is sleeved on the corresponding connecting protrusion;

[0026] The upper shell, the water baffle and the lower shell are riveted and fastened;

[0027] The outer surface of one end of the waterproof pipe and the main plate, the inner surface of the other end of the waterproof pipe and the connecting protrusion, and the water inlet and the lower shell, and the water outlet and the upper shell are respectively sealed by brazing;

[0028] Each PTC heating block is inserted into the corresponding waterproof pipe, the heating assembly is installed, and the sealing cover is installed on the main plate.

[0029] The assembling method of the water heating PTC heater can realize the assembly and molding of the water heating PTC heater, and by adopting the riveting and brazing sealing mode, the production and manufacturing can be facilitated, the weight and cost can be reduced, and the durability, safety and reliability of the heater can be improved.

[0030] In addition, by brazing the outer surface of one end of the waterproof pipe to the main plate and brazing the inner surface of the other end to the connecting protrusion, the waterproof pipe can be a hollow pipe with both ends open, thereby reducing the thickness of the waterproof pipe, and not only reducing the cost, but also improving the heat transfer capacity. BRIEF DESCRIPTION OF DRAWINGS

[0031] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The illustrations are shown to explain the present application and are not intended to limit the present application in any manner. In the drawings:

[0032] Figure 1 Structure diagram of the water heating PTC heater according to the embodiment of the present application;

[0033] Figure 2 Exploded view of the water heating PTC heater according to the embodiment of the present application;

[0034] Figure 3 Structure diagram of the upper shell according to the embodiment of the present application;

[0035] Figure 4 Structure diagram of the main plate according to the embodiment of the present application;

[0036] Figure 5 Structure diagram of the lower shell according to the embodiment of the present application;

[0037] Figure 6 Structure diagram of the waterproof plate according to the embodiment of the present application;

[0038] Figure 7 Structure diagram of the heating assembly according to the embodiment of the present application;

[0039] Figure 8 Structure diagram of the waterproof pipe according to the embodiment of the present application;

[0040] Figure 9 Schematic diagram of the PTC heating block staggered arrangement according to the embodiment of the present application;

[0041] Figure 10 Schematic diagram of the main plate and the upper shell after connection according to the embodiment of the present application;

[0042] Figure 11 Schematic diagram of the upper shell, the waterproof plate and the lower shell after connection according to the embodiment of the present application;

[0043] Figure 12 Schematic diagram of the heating assembly after installation according to the embodiment of the present application;

[0044] Figure 13The flow diagram of the cooling liquid in the water heating PTC heater according to the embodiment of the present application is shown in the figure;

[0045] Explanation of reference numerals:

[0046] 1, upper shell; 2, lower shell; 3, main plate; 4, water inlet; 5, water outlet; 6, water baffle; 7, sealing cover; 8, first rivet; 9, electric appliance box; 10, mounting bracket; 11, mounting screw; 12, PTC heating block; 13, circuit board; 14, second rivet; 15, waterproof pipe; 16, circuit board mounting column; 17, water outlet temperature sensor; 18, water inlet temperature sensor;

[0047] 101, upper shell through hole; 102, first upper shell riveting hole; 103, second upper shell riveting hole; 104, upper shell mounting via hole; 105, lower water outlet temperature sensor via hole; 106, middle water inlet temperature sensor via hole;

[0048] 201, lower shell riveting hole; 202, connecting protrusion; 203, lower shell mounting via hole;

[0049] 301, main plate through hole; 302, main plate riveting hole; 303, upper water outlet temperature sensor via hole; 304, upper water inlet temperature sensor via hole; 305, mounting column fixing hole; 306, clamping jaw;

[0050] 601, water baffle through hole; 602, water passing hole; 603, water baffle riveting hole; 604, lower water inlet temperature sensor via hole; 605, water baffle mounting via hole. DETAILED DESCRIPTION

[0051] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0052] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0053] Furthermore, in the description of the present application, unless otherwise specifically defined, the terms "mounting", "connection", "connected", "connector" should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0054] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0055] The present embodiment relates to a water heating PTC heater, which is generally used in the automotive air conditioning system to heat the coolant so as to provide warm air to the vehicle interior through the heater core.

[0056] Overall, in combination with Figure 1 and Figure 2 shown in the above, the water heating PTC heater comprises an upper shell 1, a lower shell 2, a water baffle 6 and a heating assembly. The upper shell 1 and the lower shell 2 are separated by the water baffle 6, and an upper water chamber and a lower water chamber are formed in the upper shell 1 and the lower shell 2 respectively. An outlet 5 is provided on the upper shell 1 at the same end of the upper water chamber and the lower water chamber, and an inlet 4 is provided on the lower shell 2 at the same end, and the other end of the upper water chamber and the lower water chamber is also connected with respect to the end having the outlet 5 and the inlet 4. The heating assembly has a circuit board 13 and a plurality of PTC heating blocks 12 connected with the circuit board 13, each PTC heating block 12 penetrates the upper shell 1 and the water baffle 6, so that each PTC heating block 12 is partially located in the upper water chamber and partially located in the lower water chamber.

[0057] Specifically, in the present embodiment, the structure of the upper shell 1 is as shown in Figure 3 , which is a box-shaped with an open lower end, a plurality of upper shell through holes 101 are provided on the upper shell 1, each of which is used for the PTC heating block 13 in the heating assembly to pass through. A first upper shell riveting hole 102, a second upper shell riveting hole 103, an upper shell mounting via hole 104, a lower outlet water temperature sensor via hole 105 and a middle inlet water temperature sensor via hole 106 are also provided on the upper shell 1.

[0058] The first upper shell riveting hole 102 is used for the connection between the upper shell 1 and the main board 3 described below, and the second upper shell riveting hole 103 is used for the connection between the upper shell 1 and the water baffle 6 and the lower shell 2. The upper shell mounting via hole 104 is a constituent part of the entire heater mounting hole, which, together with the water baffle mounting via hole 605 and the lower shell mounting via hole 203 described below, constitutes the heater mounting hole for the installation of the water heating PTC heater of the embodiment in the vehicle.

[0059] The lower outlet water temperature sensor through hole 105 and the middle inlet water temperature sensor through hole 106 are respectively used for the outlet water temperature sensor 18 and the inlet water temperature sensor 17 to pass through, so as to install the two. In addition, the lower outlet water temperature sensor through hole 105 and the upper outlet water temperature sensor through hole 303 on the main plate 3 together constitute a through hole structure for the outlet water temperature sensor 18. The middle inlet water temperature sensor through hole 106 and the upper inlet water temperature sensor through hole 304 and the lower inlet water temperature sensor through hole 604 together constitute a through hole structure for the inlet water temperature sensor 17.

[0060] In this embodiment, as a preferred implementation form, the outlet 5 is riveted to the upper shell 1, and the riveting method can be realized by using conventional riveting process. In addition, as a preferred implementation form, the main plate 3 is further fixed to the top of the upper shell 1, the circuit board 13 is fixed to the main plate 3, and the PTC heating block 12 is arranged through the main plate 3, and the sealing cover 7 for covering the circuit board 13 is further arranged on the main plate 3.

[0061] At this time, the structure of the main plate 3 is as shown in Figure 4 The upper shell through hole 101 is arranged on the upper shell 1, and the main plate through hole 301 is arranged on the main plate 3, which is used for the PTC heating block 12 to pass through. The main plate riveting hole 302, the upper outlet water temperature sensor through hole 303, the upper inlet water temperature sensor through hole 304, the mounting column fixing hole 305 and the clamping jaw 306 are further arranged on the main plate 3.

[0062] The main plate riveting hole 302 is arranged in one-to-one correspondence with the first upper shell riveting hole 102 on the upper shell 1, so as to connect the main plate 3 and the upper shell 1. The upper outlet water temperature sensor through hole 303 and the upper inlet water temperature sensor through hole 304 are used for the outlet water temperature sensor 18 and the inlet water temperature sensor 17 to pass through, so as to install the two. The mounting column fixing hole 305 is part of the overall heater mounting hole, and the clamping jaw 306 is arranged on the flange formed around the main plate 3, and is used for clamping and fixing the sealing cover 7.

[0063] The structure of the lower shell 2 of this embodiment is as shown in Figure 5As shown in Fig. 2, similar to the structure of the upper shell 1, the lower shell 2 is also provided with a lower shell riveting hole 201 and a lower shell mounting via hole 203. The lower shell riveting hole 201 is used for connecting the upper shell 1, the waterproof plate 6 and the lower shell 2, and the lower shell mounting via hole 203 is used as a part of the mounting hole of the heater. Similar to the water outlet 5, the water outlet 5 can be riveted to the lower shell 2, and the riveting process is a conventional riveting process.

[0064] In addition, a plurality of connecting protrusions 202 are formed in the lower shell 2, and each connecting protrusion 202 corresponds to the main plate via hole 301 on the main plate 3, the upper shell via hole 101 on the upper shell 1, and the waterproof plate via hole 601 on the waterproof plate 6. In addition, each connecting protrusion 202 is used to connect one end of the waterproof pipe 15.

[0065] The structure of the waterproof plate 6 is shown in Fig. 3. Figure 6 As described above, a plurality of waterproof plate via holes 601 are provided on the waterproof plate 6, and each waterproof plate via hole 601 corresponds to the main plate via hole 301, the upper shell via hole 101 and the connecting protrusion 202, and is used for the PTC heating block 12. In addition to the waterproof plate via hole 601, the waterproof plate 6 is also provided with a water passage hole 602, a waterproof plate riveting hole 603, a lower water inlet temperature sensor via hole 604 and a waterproof plate mounting via hole 605.

[0066] The water passage hole 602 is located at one end of the waterproof plate 6, and the communication between the upper and lower water chambers is achieved through the water passage hole 602. The waterproof plate riveting hole 603 corresponds to the second upper shell riveting hole 103 and the lower shell riveting hole 201, and is used for connecting the upper shell 1, the waterproof plate 6 and the lower shell 2. The lower water inlet temperature sensor via hole 604 is used for the water inlet temperature sensor via hole 17 to pass through and enter the lower water chamber, and the waterproof plate mounting via hole 605 is used as a part of the mounting hole of the heater, together with the upper shell mounting via hole 104 and the lower shell mounting via hole 203.

[0067] The structure of the heating assembly of the embodiment is shown in Fig. 4. Figure 7 The PTC heating block 12 adopts a block structure loaded with a ceramic PTC heating element, and the circuit board 13 adopts a conventional circuit board structure for electrically connecting the PTC heating block 12 and the water inlet temperature sensor 17 and the water outlet temperature sensor 18.

[0068] In addition, the plurality of PTC heating blocks 12 of the present embodiment are also arranged in multiple rows, and specifically, in the present embodiment, the PTC heating blocks 12 are arranged in two rows, and meanwhile, the main plate through holes 301, the upper shell through holes 101, the water baffle through holes 601 and the connecting protrusions 202, etc. for the PTC heating blocks 12 are also one-to-one corresponding to the PTC heating blocks 12, so as to adopt the same arrangement mode.

[0069] Further, as a preferred implementation form, on the basis of being arranged in multiple rows, in the PTC heating blocks 12 of each row of the present embodiment, the adjacent PTC heating blocks 12 are also arranged in a staggered manner. Of course, the upper shell through holes 101, the water baffle through holes 601 and the connecting protrusions 202, etc. are also arranged in a staggered manner synchronously with the staggered arrangement of the PTC heating blocks 12, and are consistent with the arrangement form of the PTC heating blocks 12. Meanwhile, the staggered arrangement of the present embodiment can also be seen in Figure 9 , and in Figure 9 , taking the arrangement of the water baffle through holes 601 on the water baffle 6 as an example, the adjacent water baffle through holes 601 in each row of water baffle through holes 601 are arranged in a staggered manner, that is, there is a position deviation k between the two, and along the arrangement direction of each row of water baffle through holes 601, each water baffle through hole 601 presents a staggered arrangement to the two sides alternately.

[0070] Through the staggered arrangement of the PTC heating blocks 12, the present embodiment can make the cooling liquid in the upper and lower water chambers be better distributed, so as to be better heated by the PTC heating blocks 12. In addition, it also needs to be pointed out that the water outlet 5 on the upper shell 1 and the water inlet 4 on the lower shell 2 of the present embodiment are also arranged in a staggered manner when arranged on the heater, as shown in Figure 1 . Specifically, as shown in Figure 1 , the water inlet 4 and the water outlet 5 are arranged on the left and right of the end of the heater respectively and close to the two sides of the heater, which can also make the cooling liquid obtain better heating effect.

[0071] In the present embodiment, an electric appliance box 9 is also arranged on one side in the water heating PTC heater, which is used for mounting and arranging the electrical components in the heater, so as to be connected with the external circuit. And specifically, the electric appliance box 9 is also fixed to the upper shell 1 and the lower shell 2 through the mounting bracket 10, and meanwhile, the electric appliance box 9 is generally fixed to the mounting bracket 10 through the mounting screw 11.

[0072] In addition, the water heating PTC heater of the present embodiment is also provided with a water inlet temperature sensor 17 and a water outlet temperature sensor 16, which are respectively installed through the temperature sensor through hole structure as described above, so that the water inlet temperature sensor 16 penetrates through the main plate 3, the upper shell 1 and the water baffle 6 to extend into the lower water chamber, and the water outlet temperature sensor 17 penetrates through the main plate 3 and the upper shell 1 to extend into the upper water chamber. At the same time, the water inlet temperature sensor 17 is also arranged close to the water inlet 4, and the water outlet temperature sensor 16 is arranged close to the water outlet 5, so as to have a better temperature detection effect.

[0073] After installation, the water inlet temperature sensor 17 and the water outlet temperature sensor 16 are also connected with the circuit board 13, so as to be connected to the electric appliance box 9 through the circuit board 13, thereby being connected with the vehicle control circuit part.

[0074] In the present embodiment, as a preferred implementation form, a waterproof pipe 15 is also sleeved outside each PTC heating block 12. At this time, the structure of the waterproof pipe 15 is as shown in Figure 8 , and is specifically arranged in the same way as the PTC heating block 12, that is, the waterproof pipe 15 also penetrates through the main plate 3, the upper shell 1 and the water baffle 6. The two ends of the waterproof pipe 15 are also connected with the main plate 3 and the lower shell 2, specifically, one end, that is, the bottom end of each waterproof pipe 15 is sleeved on and fixedly connected with the corresponding connecting protrusion 202. The top end of each waterproof pipe 15 is connected with the flange formed on the edge of the main plate through hole 301.

[0075] As a preferred fixed connection manner, based on the arrangement of the riveting holes on the main plate 3, the upper shell 1, the water baffle 6 and the lower shell 2 as described above, the main plate 3 and the upper shell 1 of the present embodiment are connected through the second rivet 14, and the upper shell 1, the water baffle 6 and the lower shell 2 are respectively fixedly connected through the first rivet 8.

[0076] In addition, it should be noted that, in order to ensure the sealing of the whole heater, the upper shell 1, the lower shell 2, the main plate 3, the water baffle 6, the water inlet 4 and the water outlet 5 of the present embodiment are usually made of composite aluminum material, and the inner wall of the main plate 6 and the waterproof pipe 15, the outer wall of the main plate 3 (that is, the flange at the edge of the main plate through hole 301) and the waterproof pipe 15, the upper shell 1, the water baffle 6 and the lower shell 2, the water inlet 4 and the lower shell 2, and the water outlet 5 and the upper shell 1 are respectively sealed by brazing.

[0077] Based on the above structure introduction, the assembly method of the water heating PTC heater of the present embodiment during assembly specifically includes the following steps.

[0078] First, the water outlet 5 is riveted to the upper shell 1, and the main plate 3 is riveted to the upper shell 1 through the second screw 14, then the water inlet 4 is also riveted to the lower shell 2, and the riveted main plate 3 and upper shell 1 are as shown in Figure 10 . Then, the upper shell 1, the waterproof plate 6 and the lower shell 2 are stacked in turn, and the waterproof pipes 15 are respectively sleeved on the corresponding connecting protrusions 202 through the main plate 3, the upper shell 1 and the waterproof plate 6. Then, the upper shell 1, the waterproof plate 6 and the lower shell 2 are riveted and fastened through the first rivet 8, and then they are moved to the brazing tool to seal the outer surface of one end of the waterproof pipe 15 and the main plate 3, the inner surface of the other end of the waterproof pipe 15 and the connecting protrusion 202, and the upper shell 1, the waterproof plate 6 and the lower shell 2, the water inlet 4 and the lower shell 2, and the water outlet 5 and the upper shell 1 respectively by brazing.

[0079] The core structure of the heater formed by the main plate 3, the upper shell 1, the waterproof plate 6 and the lower shell 2 after brazing sealing is as shown in Figure 11 . It should be noted that before brazing sealing, the water inlet temperature sensor 17, the water outlet temperature sensor 18 and the mounting brackets 10 on both sides are generally installed to achieve sealing of the positions of the temperature sensors by brazing, and to fix the mounting brackets 10 with the upper shell 1 and the lower shell 2.

[0080] In addition, it should be noted that the circuit board mounting column 16 for mounting the circuit board 13 can generally be riveted to the main plate 3 before the main plate 3 and the upper shell 1 are riveted. Alternatively, the circuit board mounting column 16 can be fixed to the main plate 3 by screwing, welding or other methods after the main plate 3 and the upper shell 1 are connected.

[0081] After the core structure of the heater is formed, the PTC heating blocks 12 are inserted into the corresponding waterproof pipes 15 to install the heating assembly, as shown in Figure 12 . Finally, the sealing cover 7 is installed on the main plate 3, and the electrical box 9 is installed on the mounting bracket 10, thereby completing the assembly of the overall heater.

[0082] The water heating PTC heater of the embodiment can heat the cooling liquid flowing through by heating the PTC heating blocks 12 in the heating assembly, so as to realize the water heating heating mode. At the same time, by locating the water inlet 4 and the water outlet 5 on the lower shell 2 and the upper shell 1 at the same end respectively, and by connecting the upper water chamber and the lower water chamber at the other end, the overall heater can realize the double-flow design of the cooling liquid flowing through, as shown in Figure 13 .

[0083] And the coolant (water temperature is lowest and highest) of the inlet and outlet one end is heated by the same PTC heating block 12, the other end of the water temperature is also heated by the same PTC heating block 12, so the heater of the embodiment can better utilize each PTC heating block 12, so that it can heat faster, so as to improve the heating efficiency of the heating assembly, and the heater has better use effect.

[0084] In addition, the heater of the embodiment can also increase the volume of the coolant flow channel, increase the heat exchange area, reduce the flow resistance, and also can reduce the overall size of the heater by directly forming the coolant flow channel by the upper and lower shells. By riveting and brazing sealing, not only can facilitate production and manufacturing, reduce weight and cost, but also can improve the durability, safety and reliability of the heater.

[0085] In addition, by brazing the outer surface of one end of the waterproof pipe 15 and the main plate 3, and brazing the inner surface of the other end and the connecting protrusion 202, the embodiment can also make the waterproof pipe 15 adopt a hollow pipe with both ends open, so as to reduce the thickness of the waterproof pipe 15, and further reduce the cost and improve the heat transfer capacity, and further improve the heating performance of the heater.

[0086] The above only describes the preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A water heating PTC heater, characterized by, The water heating PTC heater comprises an upper casing (1), a lower casing (2), a water partition plate (6) and a heating assembly, wherein: The upper casing (1) and the lower casing (2) are separated by the water partition plate (6), and an upper water chamber and a lower water chamber are formed in the upper casing (1) and the lower casing (2) respectively; The upper water chamber and the lower water chamber are provided with a water outlet (5) on the upper casing (1) and a water inlet (4) on the lower casing (2) at the same end respectively, and the other end of the upper water chamber and the lower water chamber is communicated relative to the end provided with the water outlet (5) and the water inlet (4); The heating assembly is provided with a circuit board (13) and a plurality of PTC heating blocks (12) connected with the circuit board (13), each PTC heating block (12) penetrates through the upper casing (1) and the water partition plate (6) and is partially located in the upper water chamber and partially located in the lower water chamber; The top of the upper casing (1) is fixedly connected with a main plate (3), the circuit board (13) is fixed on the main plate (3), each PTC heating block (12) penetrates through the main plate (3) and is provided together, and each PTC heating block (12) is provided with a waterproof pipe (15); The waterproof pipe (15) is a hollow pipe with two open ends, the waterproof pipe (15) penetrates through the main plate (3), the upper casing (1) and the water partition plate (6), and the inner wall of the lower casing (2) is provided with a plurality of connecting protrusions (202), each connecting protrusion (202) is arranged in one-to-one correspondence with the waterproof pipe (15); One end of each waterproof pipe (15) is sleeved on the corresponding connecting protrusion (202) and is fixedly connected with the connecting protrusion (202), the other end of each waterproof pipe (15) is connected with the flange of the through hole (301) formed on the main plate (3), and each waterproof pipe (15) and the corresponding connecting protrusion (202) and the flange are brazed and sealed, so as to form a cooling liquid flow channel in the upper water chamber and the lower water chamber outside each waterproof pipe (15).

2. The water heating PTC heater according to claim 1, wherein: One end of the water partition plate (6) is provided with a water passing hole (602); The upper water chamber and the lower water chamber are communicated through the water passing hole (602).

3. The water heating PTC heater according to claim 1, wherein: A plurality of PTC heating blocks (12) are arranged in multiple rows; In each row of PTC heating blocks (12), adjacent PTC heating blocks (12) are arranged in staggered manner.

4. The water heating PTC heater according to claim 1, wherein: The water heating PTC heater further comprises an electric appliance box (9); The electric appliance box (9) is fixedly connected with the upper casing (1) and the lower casing (2) through a mounting support (10).

5. The water heating PTC heater according to any one of claims 1 to 4, wherein: The main plate (3) is provided with a sealing cover (7) for covering the circuit board (13).

6. The water heating PTC heater according to claim 5, characterized in that: the water heating PTC heater further comprises a water inlet temperature sensor (18) and a water outlet temperature sensor (17); the water inlet temperature sensor (18) penetrates through the main plate (3), the upper shell (1) and the water partition plate (6) to extend into the lower water chamber and is arranged close to the water inlet (4); the water outlet temperature sensor (17) penetrates through the main plate (3) and the upper shell (1) to extend into the upper water chamber and is arranged close to the water outlet (5).

7. The water heating PTC heater according to claim 5, characterized in that: the water inlet (4) and the water outlet (5) are respectively riveted to the lower shell (2) and the upper shell (1); the main plate (3) and the upper shell (1), and the upper shell (1), the water partition plate (6) and the lower shell (2) are respectively fixed by rivets; the main plate (3) and the connecting protrusion (202) and the waterproof pipe (15), the upper shell (1), the water partition plate (6) and the lower shell (2), the water inlet (4) and the lower shell (2), and the water outlet (5) and the upper shell (1) are respectively sealed by brazing.

8. The assembly method of the water heating PTC heater according to claim 7, characterized in that, the assembly method comprises: riveting the water outlet (5) and the main plate (3) to the upper shell (1) respectively, and riveting the water inlet (4) and the lower shell (2); stacking the upper shell (1), the water partition plate (6) and the lower shell (2) together; penetrating each waterproof pipe (15) through the main plate (3), the upper shell (1) and the water partition plate (6) and sleeving it on the corresponding connecting protrusion (202); riveting the upper shell (1), the water partition plate (6) and the lower shell (2) tightly; sealing between the outer surface of one end of the waterproof pipe (15) and the main plate (3), between the inner surface of the other end of the waterproof pipe (15) and the connecting protrusion (202), between the upper shell (1), the water partition plate (6) and the lower shell (2), between the water inlet (4) and the lower shell (2), and between the water outlet (5) and the upper shell (1) by brazing respectively; inserting each PTC heating block (12) into the corresponding waterproof pipe (15), installing the heating assembly, and installing the sealing cover (7) on the main plate (3).

Images