A stable liquid heater

Abstract

The application relates to a stable liquid heater, which comprises a heater shell, a heat-conducting shell arranged in the heater shell, a plurality of independent accommodating cavities arranged on the heat-conducting shell, PTC heating elements arranged in the accommodating cavities, a heat insulation plate arranged in the heat-conducting shell and covering the PTC heating elements, electrically-conductive sheets arranged on the PTC heating elements and extending to the outside of the accommodating cavities, through holes corresponding to the electrically-conductive sheets arranged on the heat insulation plate, and the electrically-conductive sheets arranged in the corresponding through holes respectively; and a limiting frame arranged on the inner side wall of the heat-conducting shell and covering the PTC heating elements, and the heat insulation plate is arranged outside the limiting frame. The application has the effect of prolonging the service life and reliability of the cable and peripheral sensitive components.

Description

Technical Field

[0001] This application relates to the technical field of liquid heaters, and more particularly to a stable liquid heater. Background Technology

[0002] Currently, PTC liquid heaters are electric heating devices that use positive temperature coefficient thermistor materials as heating elements. When the temperature of the PTC material rises to a certain critical value, its resistance will rise sharply, thereby automatically limiting the current and heat generation. They are widely used in automobiles, home appliances, industrial equipment and other fields for rapid, safe and efficient heating of liquids such as water, antifreeze and oil.

[0003] PTC liquid heaters for automobiles are key components in the thermal management systems of new energy vehicles. They are mainly used to heat the coolant in low-temperature environments, thereby achieving battery pack preheating, passenger compartment heating, and insulation or heating of the motor / electronic control system. Their structure mainly includes a PTC heating element, a metal heat-conducting shell, a heater housing, and an interface. The PTC heating element is encapsulated in the metal heat-conducting shell. The coolant flows through the heater housing from the external interface, absorbs the heat generated by the PTC heating element, and is then pumped to the components requiring heating.

[0004] In related technologies, after the PTC heating elements are installed sequentially in the metal heat-conducting shell, the terminals of each PTC heating element need to be wired to achieve circuit conduction. Since the PTC heating elements generate a lot of heat when they are working, and the cables are directly exposed to the high-temperature environment, it is very easy for the cables to have safety hazards such as insulation failure, connection failure, and control abnormality, which reduces the life and reliability of the cables to a certain extent. Utility Model Content

[0005] This application provides a stable liquid heater, which has a stable structure, further improves the safety factor, reduces safety hazards caused by cable failure, and improves the life and reliability of the cable.

[0006] The stabilized liquid heater provided in this application adopts the following technical solution: A stable liquid heater includes a heater housing, a heat-conducting shell disposed inside the heater housing, a plurality of independent receiving cavities disposed on the heat-conducting shell, a PTC heating element disposed within each receiving cavity, a heat insulation plate disposed inside the heat-conducting shell covering the PTC heating element, conductive plates electrically connected to the PTC heating element extending to the outside of the receiving cavity, and through holes corresponding to the conductive plates on the heat insulation plate, with the conductive plates respectively passing through their respective through holes; a limiting frame disposed on the inner side wall of the heat-conducting shell and mounted outside the PTC heating element, with the heat insulation plate placed outside the limiting frame.

[0007] Preferably, a snap-fit ​​seat is provided on the inner side wall of the heat-conducting housing, and a snap-fit ​​groove is provided on the limiting frame to engage with the snap-fit ​​seat.

[0008] Preferably, the limiting frame is provided with multiple sets of clamping slots respectively opposite to the PTC heating element, and the PTC heating element is respectively inserted and limited in its respective clamping slot.

[0009] Preferably, the limiting frame has reinforcing frames arranged in a cross pattern, the heat insulation plate is placed on the outside of the reinforcing frame, and the reinforcing frame has a support plate located between adjacent PTC heating elements. The support plate is supported on the inner wall of the heat-conducting shell.

[0010] Preferably, the heat insulation plate is provided with a cover plate on the outside, the conductive sheet is inserted through and limited on the cover plate, and a support platform is provided circumferentially around the inner side wall of the heat-conducting shell, and the heat insulation plate is placed on the support platform.

[0011] Preferably, a wire fixing plate is provided on the outside of the cover plate, and a wire clamping hole is provided through the wire fixing plate.

[0012] Preferably, the heater housing further includes a sealing plate covering the outside of the heat-conducting housing, and a pressure plate is provided on the side wall of the sealing plate facing the wire fixing plate, the pressure plate pressing against the wire fixing plate.

[0013] In summary, this application includes at least one of the following beneficial technical effects: The heat insulation board can effectively block or reflect the heat transferred from the PTC heating element to the cable or surrounding sensitive components, thereby ensuring the safety and reliability of the system, reducing safety hazards caused by cable failure, and improving the life and reliability of the cable and surrounding sensitive components. The limiting bracket is in contact with the outer surface of the PTC heating element, and the limiting bracket is used to limit and fix each PTC heating element located in the same row in the receiving cavity to prevent the PTC heating element from detaching from the receiving cavity. The PTC heating elements are inserted and positioned in their respective clamping slots. Under the clamping and positioning of the clamping slots, the stability and reliability of the PTC heating elements in the cavity can be further improved, and the shaking of the PTC heating elements can be reduced. When the insulation board is subjected to external impact, the limiting frame and support plate can support the insulation board, making it less prone to deformation, thereby further improving the structural stability of the insulation board. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2This is a partial structural diagram showing the cavity protruding after partially concealing the PTC heating element; Figure 3 yes Figure 1 A schematic diagram of a partial structural explosion; Figure 4 yes Figure 3 A schematic diagram of a partial structural explosion; Figure 5 This is an exploded view of a portion of the structure highlighting the limiting frame and the reinforcing frame; Figure 6 This is a partial structural diagram highlighting the pressure plate at the bottom of the sealing plate.

[0015] Explanation of reference numerals in the attached drawings: 1. Heater housing; 2. Heat-conducting housing; 20. Receiving cavity; 21. Snap-fit ​​seat; 22. Support platform; 3. PTC heating element; 30. Conductive sheet; 4. Heat insulation plate; 40. Perforation; 5. Limiting frame; 50. Slot; 51. Clamping slot; 6. Reinforcing frame; 60. Support plate; 7. Cover plate; 8. Wire fixing plate; 80. Wire clamping hole; 9. Sealing plate; 90. Pressure plate. Detailed Implementation

[0016] The present application will be further described in detail below with reference to the accompanying drawings.

[0017] This application discloses a stable liquid heater.

[0018] Reference Figure 1 , Figure 2 The stable liquid heater includes a heater housing 1 and a heat-conducting housing 2 disposed inside the heater housing 1. A jacket for supplying coolant flow is formed between the outer side wall of the heat-conducting housing 2 and the inner side wall of the heater housing 1. Multiple receiving cavities 20 are integrally formed on the inner side wall of the heat-conducting housing 2 and are arranged in sequence at intervals. Each receiving cavity 20 is independent of each other, and a PTC heating element 3 is inserted and fixed in each receiving cavity 20.

[0019] like Figure 3 , Figure 4 As shown, a heat insulation plate 4, which covers the PTC heating element 3, is detachably installed inside the heat-conducting housing 2. The heat insulation plate 4 can be made of stainless steel plates that are spliced ​​and fixed together, with a glass fiber layer, ceramic fiber layer, or aerogel layer sandwiched in the middle. A cover plate 7 is stacked on the outer side wall of the heat insulation plate 4 away from the PTC heating element 3. The stacked heat insulation plates 4 and cover plates 7 are fixed inside the heat-conducting housing 2 by bolts.

[0020] like Figure 4 , Figure 5As shown, a conductive sheet 30 extending out of the receiving cavity 20 is electrically connected to the PTC heating element 3. The conductive sheet 30 is used to electrically connect with an external cable, thereby enabling the working circuit of the PTC heating element 3 to be turned on. A through hole 40 corresponding to each conductive sheet 30 is formed on the heat insulation plate 4. The conductive sheets 30 are respectively inserted into their respective through holes 40 and are inserted into and positioned on the cover plate 7. A support platform 22 is integrally formed on the inner wall of the heat-conducting housing 2, and the outer edge of the heat insulation plate 4 rests on the support platform 22.

[0021] like Figure 2 , Figure 5 As shown, multiple sets of snap-fit ​​seats 21 are fixedly installed on the inner wall of the heat-conducting housing 2. The snap-fit ​​seats 21 are arranged sequentially at intervals, and two snap-fit ​​seats 21 in the same set are symmetrically arranged on both sides of the heat-conducting housing 2. Multiple limiting brackets 5 are provided on the inner wall of the heat-conducting housing 2, which are opposite to each set of snap-fit ​​seats 21. The limiting brackets 5 are respectively mounted on the outside of each PTC heating element 3 located in the same row. Both sides of the limiting bracket 5 are provided with locking grooves 50 that engage with the snap-fit ​​seats 21. The limiting bracket 5 can be detachably installed and fixed in the heat-conducting housing 2 through the engagement of the snap-fit ​​seats 21 and the locking grooves 50. The limiting bracket 5 is in contact with the outer surface of the PTC heating element 3, and the limiting bracket 5 is used to limit and fix each PTC heating element 3 located in the same row in the receiving cavity 20 to prevent the PTC heating element 3 from detaching from the receiving cavity 20.

[0022] like Figure 4 , Figure 5 As shown, the heat insulation plate 4 is placed on the outer side wall of the limiting frame 5 away from the PTC heating element 3. The limiting frame 5 has multiple sets of clamping grooves 51 that are respectively opposite to the PTC heating element 3 on its side wall facing the PTC heating element 3. The PTC heating element 3 is inserted and limited in its respective clamping groove 51. Under the clamping and limiting of the clamping groove 51, the stability and reliability of the PTC heating element 3 in the receiving cavity 20 can be further improved, and the shaking of the PTC heating element 3 can be reduced.

[0023] like Figure 4 , Figure 5As shown, multiple parallel reinforcing frames 6 are arranged in a crisscross pattern on the limiting frame 5. Positioning posts are provided on the limiting frame 5, and the reinforcing frames 6 are inserted and fixed to the outside of the positioning posts, with an interference fit between the reinforcing frames 6 and the positioning posts. The heat insulation plate 4 is placed on the outside of the reinforcing frame 6. A support plate 60 is fixedly installed on the side wall of the reinforcing frame 6 away from the heat insulation plate 4, located between two adjacent PTC heating elements 3. The support plate 60 is supported on the inner side wall of the heat-conducting shell 2. The crisscross arrangement of the limiting frame 5 and the support plate 60 further enhances the impact resistance of the heat insulation plate 4. When the heat insulation plate 4 is subjected to external impact, the limiting frame 5 and the support plate 60 can support the heat insulation plate 4, making it less prone to deformation, thereby further improving the structural stability of the heat insulation plate 4.

[0024] The heat insulation plate 4 can effectively block or reflect the heat transferred from the PTC heating element 3 to the cable or surrounding sensitive components, thereby ensuring the safety and reliability of the system, reducing safety hazards caused by cable failures, and improving the lifespan and reliability of the cable and surrounding sensitive components.

[0025] like Figure 4 As shown, multiple sets of wire fixing plates 8 are fixedly installed on the outer side wall of the cover plate 7 away from the heat insulation plate 4. Each set of wire fixing plates 8 is located on one side of the conductive sheet 30. Multiple wire clamping holes 80 are arranged in sequence and spaced apart on the wire fixing plate 8. The wire clamping holes 80 are used for external cables to pass through and are limited in the wire clamping holes 80. By binding the cables on the wire fixing plate 8, the cable layout can be optimized, making the wiring more reasonable and neat.

[0026] like Figure 4 , Figure 6 As shown, the heater housing 1 also includes a sealing plate 9 covering the outside of the heat-conducting housing 2. The sealing plate 9 is bolted to the heater housing 1 to secure the heat-conducting housing 2. A pressure plate 90 is integrally formed on the side wall of the sealing plate 9 facing the wire-fixing plate 8. When the sealing plate 9 is sealed and fixed to the outside of the heat-conducting housing 2, the pressure plate 90 will press against the outer side wall of the wire-fixing plate 8, thereby sealing one side of the notch of the wire clamping hole 80, effectively preventing the cable from coming out of the wire clamping hole 80, and further improving the wire binding effect.

[0027] The implementation principle is as follows: the limiting frame 5 contacts the outer surface of the PTC heating element 3, and the limiting frame 5 is used to limit and fix each PTC heating element 3 located in the same row within the receiving cavity 20 to prevent the PTC heating element 3 from detaching from the receiving cavity 20. The PTC heating elements 3 are respectively inserted and limited in their respective corresponding clamping slots 51. Under the clamping and limiting of the clamping slots 51, the stability and reliability of the PTC heating elements 3 within the receiving cavity 20 are further improved, and the shaking of the PTC heating elements 3 is reduced. When the heat insulation plate 4 is subjected to external impact, the limiting frame 5 and the support plate 60 can support the heat insulation plate 4, making it less prone to deformation, thereby further improving the structural stability of the heat insulation plate 4. The heat insulation plate 4 can effectively block or reflect the heat transferred from the PTC heating element 3 to the cable or surrounding sensitive components, thereby ensuring the safety and reliability of the system, reducing safety hazards caused by cable failures, and improving the lifespan and reliability of the cable and surrounding sensitive components.

[0028] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A stable liquid heater, comprising a heater housing (1), a heat-conducting housing (2) disposed inside the heater housing (1), wherein the heat-conducting housing (2) is provided with a plurality of independent receiving cavities (20), and a PTC heating element (3) is disposed within each receiving cavity (20), characterized in that: The heat-conducting housing (2) is provided with a heat insulation plate (4) covering the outside of the PTC heating element (3). The PTC heating element (3) is electrically connected to a conductive sheet (30) extending out of the receiving cavity (20). The heat insulation plate (4) has through holes (40) corresponding to the conductive sheets (30). The conductive sheets (30) are respectively installed on their respective corresponding through holes (40). The inner side wall of the heat-conducting housing (2) is provided with a limiting frame (5) mounted on the outside of the PTC heating element (3). The heat insulation plate (4) is placed outside the limiting frame (5).

2. The stable liquid heater according to claim 1, characterized in that: The inner wall of the heat-conducting housing (2) is provided with a snap-fit ​​seat (21), and the limiting frame (5) is provided with a snap-fit ​​groove (50) that engages with the snap-fit ​​seat (21).

3. The stabilized liquid heater according to claim 2, characterized in that: The limiting frame (5) is provided with multiple sets of clamping slots (51) that are respectively opposite to the PTC heating element (3). The PTC heating element (3) is inserted and limited in its respective corresponding clamping slot (51).

4. The stabilized liquid heater according to claim 3, characterized in that: The limiting frame (5) is provided with a reinforcing frame (6) arranged in a cross pattern. The heat insulation plate (4) is placed on the outside of the reinforcing frame (6). The reinforcing frame (6) is provided with a support plate (60) located between adjacent PTC heating elements (3). The support plate (60) is supported on the inner wall of the heat-conducting shell (2).

5. The stabilized liquid heater according to claim 1, characterized in that: The heat insulation plate (4) is provided with a cover plate (7) on the outside. The conductive sheet (30) is inserted through and limited on the cover plate (7). The inner side wall of the heat-conducting shell (2) is provided with a support platform (22) in a circumferential manner. The heat insulation plate (4) is placed on the support platform (22).

6. The stabilized liquid heater according to claim 5, characterized in that: The cover plate (7) is provided with a wire fixing plate (8) on the outside, and the wire fixing plate (8) has a wire clamping hole (80) through it.

7. The stabilized liquid heater according to claim 6, characterized in that: The heater housing (1) also includes a sealing plate (9) covering the outside of the heat-conducting housing (2). A pressure plate (90) is provided on the side wall of the sealing plate (9) facing the wire fixing plate (8), and the pressure plate (90) and the wire fixing plate (8) press against each other.

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