PTC water heating heater

Abstract

The utility model relates to a kind of PTC water heating heater, including non-metal base, shell and control box for placing main control board, shell and non-metal base and control box are all connected by elastic sealing element, shell and non-metal base are enclosed to form first chamber, and with control box enclosed to form second chamber, heating core body electrically connected with main control board is equipped in shell, first heat exchange mechanism is equipped in first chamber, second heat exchange mechanism is equipped in second chamber, to exchange heat for first heat exchange mechanism and second heat exchange mechanism respectively with heating core body, control box and second heat exchange mechanism are welded and sealed arrangement, inlet and outlet are formed on non-metal base, the inlet of first chamber and second chamber are all communicated with inlet, and the outlet of first chamber and second chamber are all communicated with outlet.The PTC water heating heater provided by the utility model solves the problem that existing PTC heater product is heavier and production cost is higher.

Description

Technical Field

[0001] This utility model relates to the field of heater technology, and in particular to a PTC water heater. Background Technology

[0002] The heating element in the PTC heater converts electrical energy into heat energy, which is then carried away by the coolant in the heater's flow channel structure. The heated coolant then heats the entire vehicle's cabin and battery pack. The heater's flow channel structure needs to be sealed to prevent coolant leakage.

[0003] In the existing technology, the components of the heater are generally sealed by welding. However, welding sealing results in an excessive number of die-cast parts and an increased welding process, which leads to a heavier product and higher production costs. Utility Model Content

[0004] The main purpose of this utility model is to propose a PTC water heater, which aims to solve the problems of existing PTC heaters being heavy and having high production costs.

[0005] To achieve the above objectives, this utility model proposes a PTC water heater, comprising a non-metallic base, a housing, and a control box for housing a main control board. The housing is connected to the non-metallic base and the control box via elastic seals. The housing and the non-metallic base enclose a first chamber, and the housing and the control box enclose a second chamber. A heating element electrically connected to the main control board is provided inside the housing. A first heat exchange mechanism is provided in the first chamber, and a second heat exchange mechanism is provided in the second chamber, so that the first heat exchange mechanism and the second heat exchange mechanism can exchange heat with the heating element respectively. The control box is welded and sealed to the second heat exchange mechanism. An inlet and an outlet are formed on the non-metallic base. The inlets of the first chamber and the second chamber are both connected to the inlet, and the outlets of the first chamber and the second chamber are both connected to the outlet.

[0006] According to some embodiments of the present invention, both the first heat exchange mechanism and the second heat exchange mechanism include a first heat exchange rib and a second heat exchange rib arranged opposite to each other in the y direction. There are multiple first heat exchange ribs and multiple second heat exchange ribs. The multiple first heat exchange ribs and the multiple second heat exchange ribs are arranged at intervals in the x direction, and each second heat exchange rib is located between two adjacent first heat exchange ribs. The multiple first heat exchange ribs and the multiple second heat exchange ribs cooperate to define a first flow channel and a second flow channel arranged in a serpentine shape. The inlets of the first flow channel and the second flow channel are both connected to the liquid inlet, and the outlets of the first flow channel and the second flow channel are both connected to the liquid outlet.

[0007] According to some embodiments of the present invention, a third heat exchange rib is provided in the middle of the first flow channel and the second flow channel. The extension direction of the third heat exchange rib is consistent with the flow direction of the coolant in the corresponding flow channel, so as to divide each flow channel into two sub-flow channels.

[0008] According to some embodiments of the present invention, it further includes an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe being connected to the inlet port and outlet port on the non-metallic base, respectively. The end of the inlet pipe near the non-metallic base has a guide surface for guiding the coolant to the inlet of the second flow channel, and the guide surface is inclined from the inlet pipe to the inlet port toward the inlet port toward the inlet of the second flow channel.

[0009] According to some embodiments of the present invention, the liquid inlet is opened on one edge of the bottom of the non-metallic base, the liquid inlet pipe includes a main body section and a connecting section, the main body section is connected to the liquid inlet through the connecting section, a part of the connecting section is connected to the side of the non-metallic base, the other part of the connecting section is connected to the bottom of the non-metallic base, and the guide surface is formed on the other part.

[0010] According to some embodiments of the present invention, the control box is provided with a guide column on the side facing the second heat exchange mechanism to guide the coolant to the second flow channel inlet. The guide column passes through the second flow channel inlet and the first flow channel inlet in sequence and extends to the liquid inlet. The guide column is arranged in the middle of the second flow channel inlet and the first flow channel inlet. A temperature sensor that can be electrically connected to the main control board is provided inside the guide column.

[0011] According to some embodiments of the present invention, the first heat exchange rib, the second heat exchange rib, and the third heat exchange rib are all arranged in a wavy shape; and / or, each of the flow channels is provided with tooth-shaped protrusions, the extension direction of the tooth-shaped protrusions being consistent with the flow direction of the coolant in the corresponding flow channel.

[0012] According to some embodiments of the present invention, the side of the housing facing the control box has an electrical control area and a heat exchange area. The electrical control area is provided with a first opening, and the control box is provided with a second opening corresponding to the first opening, so that the pins of the heating core can pass through the first opening and the second opening in sequence and be electrically connected to the main control board. The second heat exchange mechanism further includes a heat exchange plate, which is disposed on the heat exchange area of ​​the housing. The heat exchange plate is provided with the plurality of first heat exchange ribs and the plurality of second heat exchange ribs. The heat exchange plate is welded and sealed to the control box.

[0013] According to some embodiments of the present invention, the heating core includes a heating chip and two electrode plates that are electrically connected to the positive and negative terminals of the main control board, respectively. The heating chip is located between the two electrode plates, and the positive and negative terminals at both ends of the heating chip are bonded to the corresponding electrode plates by conductive adhesive.

[0014] According to some embodiments of the present invention, a plastic limiting frame is provided inside the housing, and the plastic limiting frame has a limiting wall that can restrict the movement of the heating core.

[0015] This utility model has at least the following beneficial effects:

[0016] In this invention, coolant is input from the inlet on the non-metallic base and diverted into the first and second chambers. The coolant in the first and second chambers receives heat from the heating core through the first and second heat exchange mechanisms, respectively. The heated coolant converges at the outlets of the first and second chambers and exits from the outlet of the non-metallic base. In areas with relatively low sealing requirements, such as between the housing and the non-metallic base and control box, this invention achieves sealing by using elastic seals instead of the original welded seals. This eliminates the need for a metal base, reduces welding processes, and lowers the weight and production cost of the PTC water heater. However, in areas with high sealing requirements, such as between the control box and the second heat exchange mechanism, welding is still used to ensure that coolant does not leak from the second heat exchange mechanism and seep into the control box, preventing a short circuit in the main control board. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 An exploded view of a PTC water heater provided in an embodiment of this utility model;

[0019] Figure 2 for Figure 1 A three-dimensional schematic diagram of a PTC water heater;

[0020] Figure 3 for Figure 1 A front view of a PTC water heater;

[0021] Figure 4 for Figure 3Sectional view of AA;

[0022] Figure 5 for Figure 1 Side view of a PTC water heater;

[0023] Figure 6 for Figure 5 Sectional view of BB;

[0024] Figure 7 for Figure 1 A 3D schematic diagram of a PTC water heater after removing its non-metallic base;

[0025] Figure 8 for Figure 1 A 3D schematic diagram of a PTC water heater after the control box has been removed;

[0026] Figure 9 for Figure 1 Top view of the PTC water heater after removing the non-metallic base and control box;

[0027] Figure 10 for Figure 1 Internal structure diagram of the middle shell;

[0028] Figure 11 for Figure 10 A three-dimensional schematic diagram of the interaction between the heating element and the plastic limiting frame;

[0029] Figure 12 for Figure 10 A three-dimensional schematic diagram of the heating element.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100-PTC water heater; 1-Non-metallic base; 11-Liquid inlet; 12-Liquid outlet; 2-Shell; 21-Electrical control area; 22-Heat exchange area; 23-Plastic limiting frame; 3-Control box; 31-Box body; 32-Cover body; 4-Elastic seal; 5-Heating core; 51-Pin; 52-Heating chip; 53-Electrode plate; 6-First heat exchange mechanism; 61-First flow channel; 7-Second heat exchange mechanism; 71-Second flow channel; 72-First heat exchange rib; 73-Second heat exchange rib; 74-Third heat exchange rib; 75-Toothed protrusion; 76-Heat exchange plate; 8-Liquid inlet pipe; 81-Main body section; 82-Connecting section; 821-Guide surface; 9-Liquid outlet pipe; 10-Guide column. Detailed Implementation

[0032] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] This utility model provides a PTC water heater. Figures 1 to 12 This invention provides a specific embodiment of a PTC water heater.

[0036] like Figures 1 to 8As shown, this utility model embodiment provides a PTC water heater 100, including a non-metallic base 1, a housing 2, and a control box 3 for housing a main control board. The housing 2 is connected to the non-metallic base 1 and the control box 3 by elastic sealing members 4. The housing 2 and the non-metallic base 1 enclose a first chamber, and the housing 2 and the control box 3 enclose a second chamber. The housing 2 is provided with a heating core 5 that can be electrically connected to the main control board. The first chamber is provided with a first heat exchange mechanism 6, and the second chamber is provided with a second heat exchange mechanism 7, so that the first heat exchange mechanism 6 and the second heat exchange mechanism 7 can exchange heat with the heating core 5 respectively. The control box 3 is welded and sealed to the second heat exchange mechanism 7. The non-metallic base 1 has a liquid inlet 11 and a liquid outlet 12. The inlets of the first chamber and the second chamber are both connected to the liquid inlet 11, and the outlets of the first chamber and the second chamber are both connected to the liquid outlet 12.

[0037] In this invention, coolant is input from the inlet 11 on the non-metallic base 1 and diverted into the first chamber and the second chamber. The coolant in the first chamber and the second chamber receives heat from the heating core 5 through the first heat exchange mechanism 6 and the second heat exchange mechanism 7, respectively. The heated coolant converges at the outlets of the first chamber and the second chamber and is output from the outlet 12 of the non-metallic base 1. In areas where sealing requirements are relatively low, such as between the housing 2 and the non-metallic base 1 and the control box 3, an elastic sealing element 4 is used to achieve sealing, replacing the original welding seal. This eliminates the need for a metal base and reduces welding processes, thereby lowering the weight and production cost of the PTC water heater 100. Meanwhile, in areas with high sealing requirements, such as between the control box 3 and the second heat exchange mechanism 7, welding is still used to ensure that coolant does not leak from the second heat exchange mechanism 7 and seep into the control box 3, preventing a short circuit in the main control board inside the control box 3.

[0038] It should be noted that the control box 3 and the second heat exchange mechanism 7 are sealed by friction stir welding. Compared with ordinary arc welding, friction stir welding can form a dense weld without pores or cracks. Furthermore, since friction stir welding is a low-temperature welding method, it can eliminate micro-leakage channels caused by welding thermal deformation, resulting in a better sealing effect.

[0039] Preferably, the control box 3 includes a box body 31 and a cover 32. The box body 31 has a receiving groove for placing the main control board. The cover 32 covers the receiving groove and is connected to the box body 31 by sealant. The cover 32 is made of non-metallic material. This configuration, by making the cover 32 a non-metallic material, further reduces the weight of the PTC water heater 100.

[0040] Specifically, in some embodiments, such as Figure 8 and Figure 9 As shown, the housing 2 has an electrical control area 21 and a heat exchange area 22 on the side facing the control box 3. The electrical control area 21 has a first opening, and the control box 3 has a second opening corresponding to the first opening, so that the pins 51 of the heating core 5 can pass through the first opening and the second opening in sequence and be electrically connected to the main control board. The second heat exchange mechanism 7 also includes a heat exchange plate 76, which is disposed on the heat exchange area 22 of the housing 2. The heat exchange plate 76 is provided with the plurality of first heat exchange ribs 72 and the plurality of second heat exchange ribs 73. The heat exchange plate 76 is welded and sealed to the control box 3. By separating the area on the housing 2 used to connect the main control board and the heating core 5 from the area used for heat exchange, and by setting the heat exchange plate 76 of the second heat exchange mechanism 7 in the heat exchange area 22, and by welding and sealing the heat exchange plate 76 to the control box 3, it is ensured that the coolant will not leak from the heat exchange area 22 to the electrical control area 21 and seep into the control box 3 through the second opening, thereby preventing a short circuit in the main control board inside the control box 3.

[0041] The specific structure of the heating core 5 is not limited; for example, in some embodiments, such as... Figure 12 As shown, the heating core 5 includes a heating chip 52 and two electrode plates 53 electrically connected to the positive and negative terminals of the main control board, respectively. The heating chip 52 is located between the two electrode plates 53, and the positive and negative terminals at both ends of the heating chip 52 are bonded to the corresponding electrode plates 53 with conductive adhesive. This configuration allows the electrode plates 53 to conduct electricity and heat simultaneously. The bonding of the positive and negative terminals at both ends of the heating chip 52 to the corresponding electrode plates 53 with conductive adhesive ensures a stable connection between the heating chip 52 and the electrode plates 53, increases the heat-conducting area between them, and reduces the manufacturing difficulty of the heating core 5 by achieving electrical connection and fixation through conductive adhesive bonding.

[0042] In some embodiments, such as Figure 10 and Figure 11As shown, a plastic limiting frame 23 is provided inside the housing 2, and the plastic limiting frame 23 has a limiting wall that can restrict the movement of the heating core 5. This design, because the plastic limiting frame 23 is made of flexible material, can prevent the heating core 5 from directly colliding with the housing 2 and causing damage. Furthermore, the separate design of the plastic limiting frame 23 and the heating core 5 simplifies the process and reduces manufacturing costs.

[0043] The specific structures of the first heat exchange mechanism 6 and the second heat exchange mechanism 7 are not limited, as long as the first flow channel 61 and the second flow channel 71 are respectively formed on the first heat exchange mechanism 6 and the second heat exchange mechanism 7. For example, in some embodiments, such as Figures 7 to 9 As shown, both the first heat exchange mechanism 6 and the second heat exchange mechanism 7 include first heat exchange ribs 72 and second heat exchange ribs 73 arranged opposite each other in the y-direction. Multiple first heat exchange ribs 72 and multiple second heat exchange ribs 73 are provided, and the multiple first heat exchange ribs 72 and multiple second heat exchange ribs 73 are spaced apart in the x-direction. Each second heat exchange rib 73 is located between two adjacent first heat exchange ribs 72. The multiple first heat exchange ribs 72 and multiple second heat exchange ribs 73 cooperate to define a serpentine first flow channel 61 and a second flow channel 71. The inlets of both the first flow channel 61 and the second flow channel 71 are connected to the liquid inlet 11, and the outlets of both the first flow channel 61 and the second flow channel 71 are connected to the liquid outlet 12. This arrangement, by setting the first flow channel 61 and the second flow channel 71 in a serpentine shape, extends the flow path of the coolant within each heat exchange mechanism, increases the contact time between the coolant and each heat exchange mechanism, thereby improving the heating effect of the heating core 5 on the coolant. The addition of multiple first heat exchange ribs 72 and second heat exchange ribs 73 increases the heat exchange area between the coolant and each heat exchange mechanism, thereby improving heating efficiency.

[0044] Furthermore, in some embodiments, such as Figures 7 to 9 As shown, both the first flow channel 61 and the second flow channel 71 are provided with a third heat exchange rib 74 in the middle. The extension direction of the third heat exchange rib 74 is consistent with the flow direction of the coolant in the corresponding flow channel, so as to divide each flow channel into two sub-channels. This arrangement forces the coolant at the inlet of each flow channel to flow into the narrower sub-channel, enhancing fluid turbulence, promoting turbulence, and disrupting the laminar boundary layer, thereby improving heat transfer efficiency. Similarly, the third heat exchange rib 74 increases the heat exchange area between the coolant and each heat exchange mechanism, improving heating efficiency.

[0045] Furthermore, in some embodiments, such as Figure 9As shown, the two branch channels have the same diameter. This configuration ensures that the effective heat exchange area of ​​the coolant is symmetrically distributed within each branch channel. The third heat exchange rib 74 equally divides the flow channels along the flow direction, giving each branch channel the same width and depth, thus allowing the heat generated by the heating core 5 to be evenly transferred to the coolant.

[0046] In some embodiments, such as Figures 2 to 6 As shown, the PTC water heater 100 also includes an inlet pipe 8 and an outlet pipe 9. The inlet pipe 8 and the outlet pipe 9 are respectively connected to the inlet port 11 and the outlet port 12 on the non-metallic base 1. The end of the inlet pipe 8 near the non-metallic base 1 has a guide surface 821 for guiding the coolant to the inlet of the second flow channel 71. The guide surface 821 is inclined from the inlet pipe 8 to the inlet port 11 towards the inlet of the second flow channel 71. When the PTC water heater 100 is installed in a car, the non-metallic base 1 is positioned downwards. Under the influence of gravity, the coolant input from the inlet pipe 8 will preferentially enter the first flow channel 61 located below, and the amount of coolant entering the second flow channel 71 above will be significantly less than that in the first flow channel 61. This results in a lower utilization rate of the second flow channel 71, which in turn reduces the overall heating efficiency of the PTC water heater 100 for the coolant. Therefore, by providing the guide surface 821 in the inlet pipe 8, the coolant is guided to the second flow channel 71, thereby improving the utilization rate of the second flow channel 71.

[0047] Furthermore, in some embodiments, such as Figures 2 to 6 As shown, the liquid inlet 11 is located on one edge of the bottom of the non-metallic base 1. The liquid inlet pipe 8 includes a main body section 81 and a connecting section 82. The main body section 81 communicates with the liquid inlet 11 through the connecting section 82. One part of the connecting section 82 is connected to the side of the non-metallic base 1, and the other part is connected to the bottom of the non-metallic base 1, with the guide surface 821 formed on the other part. Similarly, the liquid outlet pipe 9 has the same structure as the liquid inlet pipe 8. The recessed design of the liquid inlet pipe 8 and the liquid outlet pipe 9 allows the non-metallic base 1 to be designed to be thinner, thereby reducing the space occupied by the PTC water heater 100 and reducing the weight of the PTC water heater 100.

[0048] In some embodiments, such as Figure 4 , Figure 6 and Figure 7As shown, the control box 3 has a guide column 10 on the side facing the second heat exchange mechanism 7 to guide the coolant to the inlet of the second flow channel 71. The guide column 10 passes through the inlet of the second flow channel 71 and the inlet of the first flow channel 61 and extends to the liquid inlet 11. The guide column 10 is positioned at the middle of the inlet of the second flow channel 71 and the inlet of the first flow channel 61. A temperature sensor electrically connected to the main control board is installed inside the guide column 10. This configuration allows the guide column 10 to guide the coolant at the liquid inlet 11 to the second flow channel 71, improving the utilization rate of the second flow channel 71. Furthermore, the middle positioning of the guide column 10 at the inlet of the second flow channel 71 and the inlet of the first flow channel 61 helps to divert the coolant flow. Simultaneously, the control box 3 has guide columns 10 at both the liquid inlet 11 and the liquid outlet 12, and each guide column 10 contains a temperature sensor for monitoring the input and output coolant temperatures.

[0049] In some embodiments, such as Figure 9 As shown, the first heat exchange rib 72, the second heat exchange rib 73, and the third heat exchange rib 74 are all arranged in a wavy shape; and / or, each of the flow channels is provided with a toothed protrusion 75, the extension direction of which is consistent with the flow direction of the coolant in the corresponding flow channel. This arrangement increases the heat exchange area between the coolant and each heat exchange mechanism, improving heating efficiency. Simultaneously, the wavy heat exchange ribs and the toothed protrusions 75 also enhance fluid turbulence, promote turbulence, and disrupt the laminar boundary layer, thereby improving heat transfer efficiency.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A PTC water heater, characterized in that, The device includes a non-metallic base, a housing, and a control box for housing the main control board. The housing is connected to both the non-metallic base and the control box via elastic seals. The housing and the non-metallic base enclose a first chamber, and the housing and the control box enclose a second chamber. The housing contains a heating element that can be electrically connected to the main control board. The first chamber contains a first heat exchange mechanism, and the second chamber contains a second heat exchange mechanism, allowing the first and second heat exchange mechanisms to exchange heat with the heating element, respectively. The control box is welded and sealed to the second heat exchange mechanism. The non-metallic base has an inlet and an outlet. The inlets of the first and second chambers are connected to the inlet, and the outlets of the first and second chambers are connected to the outlet.

2. The PTC water heater as described in claim 1, characterized in that, Both the first heat exchange mechanism and the second heat exchange mechanism include a first heat exchange rib and a second heat exchange rib arranged opposite to each other in the y direction. There are multiple first heat exchange ribs and multiple second heat exchange ribs. The multiple first heat exchange ribs and the multiple second heat exchange ribs are arranged at intervals in the x direction, and each second heat exchange rib is located between two adjacent first heat exchange ribs. The multiple first heat exchange ribs and the multiple second heat exchange ribs cooperate to define a first flow channel and a second flow channel arranged in a serpentine shape. The inlets of the first flow channel and the second flow channel are connected to the liquid inlet, and the outlets of the first flow channel and the second flow channel are connected to the liquid outlet.

3. The PTC water heater as described in claim 2, characterized in that, Both the first and second flow channels are provided with a third heat exchange rib in the middle. The extension direction of the third heat exchange rib is consistent with the flow direction of the coolant in the corresponding flow channel, so as to divide each flow channel into two sub-flow channels.

4. The PTC water heater as described in claim 3, characterized in that, It also includes an inlet pipe and an outlet pipe, which are respectively connected to the inlet and outlet on the non-metallic base. The end of the inlet pipe near the non-metallic base has a guide surface for guiding the coolant to the inlet of the second flow channel. The guide surface is inclined from the inlet pipe to the inlet towards the inlet of the second flow channel.

5. The PTC water heater as described in claim 4, characterized in that, The liquid inlet is located on one of the edges of the bottom of the non-metallic base. The liquid inlet pipe includes a main body section and a connecting section. The main body section is connected to the liquid inlet through the connecting section. One part of the connecting section is connected to the side of the non-metallic base, and the other part of the connecting section is connected to the bottom of the non-metallic base. The other part has the flow guide surface formed on it.

6. The PTC water heater as described in claim 3, characterized in that, The control box has a guide column on the side facing the second heat exchange mechanism to guide the coolant to the second flow channel inlet. The guide column passes through the second flow channel inlet and the first flow channel inlet in sequence and extends to the liquid inlet. The guide column is set at the middle of the second flow channel inlet and the first flow channel inlet. A temperature sensor that can be electrically connected to the main control board is provided inside the guide column.

7. The PTC water heater as described in claim 3, characterized in that, The first heat exchange rib, the second heat exchange rib, and the third heat exchange rib are all arranged in a wavy shape; and / or, Each of the aforementioned distribution channels is provided with tooth-shaped protrusions, and the extension direction of the tooth-shaped protrusions is consistent with the flow direction of the coolant in the corresponding distribution channel.

8. The PTC water heater as described in claim 2, characterized in that, The housing has an electrical control area and a heat exchange area on the side facing the control box. The electrical control area has a first opening, and the control box has a second opening corresponding to the first opening, so that the pins of the heating core can pass through the first opening and the second opening in sequence and be electrically connected to the main control board. The second heat exchange mechanism also includes a heat exchange plate, which is disposed on the heat exchange area of ​​the housing. The heat exchange plate has a plurality of first heat exchange ribs and a plurality of second heat exchange ribs. The heat exchange plate is welded and sealed to the control box.

9. The PTC water heater as described in claim 1, characterized in that, The heating core includes a heating chip and two electrode plates that are electrically connected to the positive and negative terminals of the main control board, respectively. The heating chip is located between the two electrode plates, and the positive and negative terminals at both ends of the heating chip are bonded to the corresponding electrode plates by conductive adhesive.

10. The PTC water heater as described in claim 1, characterized in that, The housing is provided with a plastic limiting frame, which has a limiting wall that can restrict the movement of the heating core.

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