An electric heating tube liquid heater

Abstract

This utility model provides an electric heating tube liquid heater, relating to the field of heater technology, to solve the technical problems of existing liquid heaters made with thick film technology, such as high flow resistance, high cost, high noise, complex manufacturing process, high power density, large size at low and medium power, complex quality control, inability to repair, and the need for replacement only. The electric heating tube liquid heater includes a shell assembly, a liquid inlet, a liquid outlet, an electrical component, a steel plate, and at least one heating tube. A partition inside the shell assembly divides the inner cavity of the shell assembly into a first inner cavity and a second inner cavity. A flow channel is provided in the first inner cavity, and a first through hole is provided on the partition. The liquid inlet and outlet are both located on the shell assembly and are connected through the flow channel. The electrical component is located in the second inner cavity. The steel plate is detachably connected to the partition and blocks the first through hole. The heating tube is located in the flow channel, with both ends passing through the steel plate and the first through hole and electrically connected to the electrical component. Both ends of the heating tube are welded to the steel plate.

Description

Technical Field

[0001] This utility model relates to the field of heater technology, specifically to an electric heating tube liquid heater. Background Technology

[0002] Traditional liquid heaters mostly employ thick-film technology, which involves screen printing resistance wires onto a steel plate to form a heating plate. High voltage is applied to both ends of the resistance wire, causing it to heat up. Due to the high power density of the steel plate surface, heat dissipation fins are welded onto the steel plate to increase the heat exchange area and dissipate heat quickly. The heat is then transferred to the coolant through the fins, raising its temperature, and finally, the coolant is used to heat the battery or cabin through the coolant piping. However, because one side of the thick-film heater is not in contact with the coolant, its heat is directly radiated into the environment, resulting in low heat conversion efficiency. While the heat dissipation fins increase the heat exchange area, this also increases flow resistance, and the welding of the fins increases the complexity of the manufacturing process. Furthermore, thick-film heaters generate noise during operation due to the piezoelectric effect. The complex manufacturing process, stringent storage conditions, and susceptibility to failure make them prone to failure, leading to high costs, complex quality control, and the inability to be repaired, requiring replacement. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an electric heating tube liquid heater to solve the technical problems of existing liquid heaters made with thick film technology, such as high flow resistance, high cost, high noise, complex manufacturing process, high power density, large size at medium and low power, complex quality control, inability to repair and only replacement.

[0004] To solve the above technical problems, this utility model provides an electric heating tube liquid heater, comprising:

[0005] A housing assembly, wherein a partition is provided inside the housing assembly, the partition dividing the inner cavity of the housing assembly into a first inner cavity and a second inner cavity, a flow channel is provided in the first inner cavity, and a first through hole is provided on the partition;

[0006] Both the liquid inlet and the liquid outlet are located on the housing assembly and are connected by a flow channel;

[0007] Electrical components are located within the second inner cavity;

[0008] A steel plate is detachably connected to the partition and seals the first through hole;

[0009] At least one heating tube, the shape of which matches the flow channel and is disposed within the flow channel, the two ends of the heating tube passing through the steel plate and the first through hole and being electrically connected to the electrical components, and the two ends of the heating tube being welded to the steel plate.

[0010] With the above structure, the electric heating tube liquid heater of this utility model has the following advantages: the electrical components control the heating tube to heat; the fluid enters from the inlet and flows out from the outlet along the flow channel; the fluid is heated by heat exchange with the heating tube while in the flow channel; moreover, the shape of the heating tube matches the flow channel, and the fluid exchanges heat with the heating tube constantly while flowing in the flow channel. Furthermore, because a thick-film heater needs a higher power density for the same power and product size, while the surface power density of the heating tube is lower than that of a thick-film heater, there is no need to add heat dissipation fins to increase the heat exchange area. It reduces flow resistance and improves heat exchange efficiency. Moreover, the heating tube is immersed in the fluid, which further increases heat exchange efficiency. It also has lower cost, lower noise, simpler manufacturing process, and smaller size at low and medium power. For the heating tube, both ends of the heating tube are concentrated on the steel plate and welded to the steel plate, which reduces the number of connecting parts and saves space. The steel plate is then connected to the partition, which facilitates the installation of the heating tube. The heating tube can be replaced by disassembling the steel plate. In addition, the steel plate is smaller in volume than the partition. Under the same welding process, the thermal deformation of the steel plate is smaller and it is easier to achieve a seal.

[0011] As an improvement, the steel plate has a recess, which is welded to the heating tube. A steel pipe is welded inside the recess, and a temperature sensor is installed inside the steel pipe. The temperature sensor is electrically connected to the electrical components. With this structure, the recess of the steel plate and the heating tube are welded together. The heat from the heating tube is conducted to the steel plate. The temperature sensor, in conjunction with the steel pipe, detects the temperature of the steel plate, thereby achieving the purpose of detecting the temperature of the heating tube, ensuring the reliability and stability of heat transfer.

[0012] As an improvement, the housing assembly includes an outer shell and a first cover plate, a partition plate is disposed inside the outer shell, a first inner cavity forms an opening at one end of the outer shell, the first cover plate is detachably connected to one end of the outer shell, and a plurality of protrusions are provided on the end face of the first cover plate facing the outer shell, and flow channels are formed between the protrusions and between the protrusions and the inner wall of the outer shell.

[0013] As an improvement, the flow channel includes an inner flow channel and an outer flow channel located outside the inner flow channel. Several protrusions include staggered first protrusions and second protrusions. The inner flow channel is formed between the first and second protrusions and is W-shaped. The outer flow channel is formed between the second protrusion and the inner wall of the outer shell and is U-shaped. One end of the inner flow channel and one end of the outer flow channel are connected to the liquid inlet, and the other end of the inner flow channel and the other end of the outer flow channel are connected to the liquid outlet. With this structure, the coolant flows in from the liquid inlet and is divided into two paths, flowing from the inner flow channel and the outer flow channel to the liquid outlet respectively. At the liquid outlet, they rejoin into one path and flow out from the liquid outlet, further improving the heating efficiency.

[0014] As an improvement, a sealing structure is provided between the outer shell and the first cover plate, and the sealing structure is arranged around the opening of the first inner cavity; this structure improves the sealing performance between the outer shell and the first cover plate.

[0015] As an improvement, a sealing structure is provided between the steel plate and the partition, and the sealing structure is arranged around the first through hole; this structure improves the sealing performance between the steel plate and the partition.

[0016] As an improvement, the sealing structure is formed of FIPG sealant; with this structure, the requirements for the sealing surface are lower compared to using rubber seals, which can reduce the production cost of parts.

[0017] As an improvement, two heating tubes are stacked together, with both ends of each heating tube welded to a steel plate; this structure improves heating efficiency.

[0018] As an improvement, a corrugated structure is provided on the inner wall of the flow channel along the flow direction; this structure increases the turbulence coefficient of the fluid, enhances the fluid's ability to carry away heat, effectively reduces the surface temperature of the heating tube, improves the heat transfer efficiency and performance of the heater, and at the same time can further reduce the size of the heating tube, thereby reducing costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the first inner cavity in this utility model.

[0021] Figure 3 This is a schematic diagram of the structure of the second inner cavity in this utility model.

[0022] Figure 4 This is an exploded structural diagram of the temperature sensor part in this utility model.

[0023] Figure 5 This is a schematic diagram of the heating tube part in this utility model.

[0024] Figure 6 This is a schematic diagram of the flow channel portion of this utility model.

[0025] Figure 7 This is a three-dimensional structural diagram of the outer shell portion of this utility model.

[0026] Reference numerals: 1. Housing assembly; 101. Outer shell; 102. First cover plate; 103. Second cover plate; 2. Partition; 3. First inner cavity; 4. Second inner cavity; 5. First through hole; 6. Liquid inlet; 7. Liquid outlet; 8. Electrical assembly; 9. Steel plate; 10. Heating tube; 11. Recess; 12. Steel pipe; 13. Temperature sensor; 14. Inner flow channel; 15. Outer flow channel; 16. First protrusion; 17. Second protrusion; 18. Bracket; 19. Corrugated structure. Detailed Implementation

[0027] The following is a detailed description of an electric heating tube liquid heater according to the present invention, with reference to the accompanying drawings.

[0028] like Figures 1 to 7 As shown, an electric heating tube liquid heater includes a housing assembly 1, a liquid inlet 6, a liquid outlet 7, an electrical assembly 8, a steel plate 9, and at least one heating tube 10. A partition 2 is provided inside the housing assembly 1, dividing the inner cavity of the housing assembly 1 into a first inner cavity 3 and a second inner cavity 4. A flow channel is provided in the first inner cavity 3, and a first through hole 5 is provided on the partition 2. The liquid inlet 6 and the liquid outlet 7 are both located on the housing assembly 1 and are connected through the flow channel. Figure 1 As shown, both the inlet 6 and the outlet 7 are located at the upper end of the housing assembly 1. The coolant enters through the inlet 6, flows through the flow channel, and exits through the outlet 7. The steel plate 9 is detachably connected to the partition 2 and blocks the first through hole 5. The steel plate 9 is located on one side of the first inner cavity 3. The steel plate 9 and the partition 2 are fixed by bolts.

[0029] like Figure 3 As shown, electrical component 8 is located within the second inner cavity 4. Electrical component 8 includes a PCB board and is connected to a connector; heating tube 10 is shaped to match the flow channel and is located within the flow channel, as shown. Figure 2 As shown, the heating tube 10 passes through the steel plate 9 and the first through hole 5 at both ends and is electrically connected to the electrical component 8. The heating tube 10 is welded to the steel plate 9 at both ends.

[0030] like Figure 4 As shown, the steel plate 9 has a recess 11, which is welded to the heating tube 10. A steel pipe 12 is welded inside the recess 11, and a temperature sensor 13 is installed inside the steel pipe 12. The temperature sensor 13 is electrically connected to the electrical component 8, thereby ensuring the reliability of heat transfer. It should be noted that the recess 11 is formed by stamping, so a protrusion is formed on the other side of the recess 11 (that is, the side closer to the heating tube 10), and this protrusion is welded to the heating tube 10.

[0031] The housing assembly 1 includes an outer shell 101, a first cover plate 102 and a second cover plate 103. A partition plate 2 is disposed inside the outer shell 101. A first inner cavity 3 forms an opening at one end of the outer shell 101. Similarly, a second inner cavity 4 also forms an opening at the other end of the outer shell 101. The first cover plate 102 is detachably connected to one end of the outer shell 101, while the second cover plate 103 is detachably connected to the other end of the outer shell 101. The first cover plate 102, the second cover plate 103 and the outer shell 101 are all detachably connected by bolts.

[0032] In this embodiment, the connectors connected to the electrical component 8 are exposed outside the second cover plate 103, making the heater overall L-shaped. In some other embodiments, these connectors can be located on the same end face as the liquid inlet 6 and the liquid outlet 7, making the heater overall I-shaped. The corresponding L-shaped or I-shaped heater is selected according to the actual installation boundary.

[0033] A sealing structure is provided between the outer shell 101 and the first cover plate 102. The sealing structure is arranged around the opening of the first inner cavity 3. A sealing structure is also provided between the steel plate 9 and the partition plate 2. The sealing structure is arranged around the first through hole 5. In addition, in order to allow the steel pipe 12 to pass through the partition plate 2, a second through hole is provided on the partition plate 2 for the steel pipe 12 to pass through. The sealing structure between the steel plate 9 and the partition plate 2 is also arranged around the second through hole. In this embodiment, the sealing structure is formed by FIPG sealant, which has a lower cost.

[0034] like Figure 6 As shown, the first cover plate 102 has a plurality of protrusions on its end face facing the outer shell 101, and flow channels are formed between the protrusions and between the protrusions and the inner wall of the outer shell 101.

[0035] Specifically, the flow channel includes an inner flow channel 14 and an outer flow channel 15 located outside the inner flow channel 14. Several protrusions include staggered first protrusions 16 and second protrusions 17, wherein the first protrusion 16 is M-shaped and the second protrusion 17 is W-shaped. The two sides of the first protrusion 16 are respectively located in the two recesses of the second protrusion 17, thereby forming the inner flow channel 14 and the outer flow channel 15. The inner flow channel 14 is formed between the first protrusion 16 and the second protrusion 17 and is W-shaped. The outer flow channel 15 is formed between the second protrusion 17 and the inner wall of the outer shell 101 and is U-shaped. The openings of the W-shaped inner flow channel 14 and the U-shaped outer flow channel 15 are both facing upward, so that one end of the inner flow channel 14 and one end of the outer flow channel 15 are connected to the liquid inlet 6, and the other end of the inner flow channel 14 and the other end of the outer flow channel 15 are connected to the liquid outlet 7.

[0036] After the coolant flows in from the inlet 6, it splits into two streams, flowing from the inner flow channel 14 and the outer flow channel 15 to the outlet 7 respectively. At the outlet 7, the two streams merge again and flow out from the outlet 7, further improving the heating efficiency. The shape and distribution of the flow channels are obtained through CFD calculations, resulting in higher heat exchange efficiency and lower flow resistance.

[0037] like Figure 6 As shown, a corrugated structure 19 is provided on the inner wall of the flow channel along the flow channel direction. Specifically, the corrugated structure 19 is formed on the inner wall of the first protrusion 16, the second protrusion 17 and the first cover plate 102. The corrugated structure 19 is formed by grooves that are equidistantly distributed along the extension direction of the flow channel.

[0038] like Figure 5 As shown, the shape of the heating tube 10 matches the flow channel. The two ends of the heating tube 10 are formed in the middle of the heating tube 10 and are brazed to the steel plate 9 after being bent. The flat heating tube 10 saves more space than the spiral heating tube 10. In addition, there are two stacked heating tubes 10, and both ends of the two heating tubes 10 are welded to the steel plate 9.

[0039] like Figure 5As shown, the heating tube 10 is welded with a bracket 18, which is detachably connected to the partition 2. Specifically, the bracket 18 is fixedly connected to the partition 2 by bolts, and one bracket 18 is welded to two heating tubes 10 at the same time.

[0040] Electrical component 8 controls heating tube 10 to heat the fluid. Fluid enters from inlet 6 and flows out from outlet 7 along the flow channel. The fluid is heated by heat exchange with heating tube 10 while in the flow channel. The shape of heating tube 10 matches the flow channel. The fluid exchanges heat with heating tube 10 at all times while flowing in the flow channel. Moreover, under the same power and product size conditions, thick film technology heaters need to have a larger power density. The surface power density of heating tube 10 is smaller than that of heating plate, so there is no need to set heat dissipation fins to increase the heat exchange area, which reduces flow resistance and improves heat exchange efficiency. In addition, heating tube 10 is immersed in fluid, which increases heat exchange efficiency. It also has lower cost, lower noise, simpler manufacturing process, and smaller size at low and medium power.

[0041] This utility model features a simple structure, convenient installation, and low cost. It solves both cost and sealing issues by welding a heating element 10 onto a small steel plate 9. FIPG sealant and screws are then used to seal the area between the steel plate 9 and the partition 2, resulting in low cost and easy production. Furthermore, the relatively small size of the steel plate 9 minimizes thermal deformation after brazing, making it easier to achieve a proper seal between the steel plate 9 and the partition 2. The heating element 10 is manufactured using a mature process, exhibiting good robustness, low price, strong resistance to external environments, rapid heating, strong dry-burning capability, and resistance to damage. The steel plate 9, heating element 10, support 18, and steel pipe 12 are all welded together in a single furnace operation, simplifying the process and reducing costs.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiment. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. An electrically heated tube liquid heater characterised in that, include: The housing assembly (1) has a partition (2) inside, which divides the inner cavity of the housing assembly (1) into a first inner cavity (3) and a second inner cavity (4). The first inner cavity (3) has a flow channel, and the partition (2) has a through hole (5). The liquid inlet (6) and the liquid outlet (7) are both located on the housing assembly (1) and connected through the flow channel; Electrical components (8) are disposed within the second inner cavity (4); A steel plate (9) is detachably connected to the partition (2) and seals the through hole (5); At least one heating tube (10) is shaped to match the flow channel and is disposed within the flow channel. The two ends of the heating tube (10) pass through the steel plate (9) and the through hole (5) and are electrically connected to the electrical component (8). The two ends of the heating tube (10) are welded to the steel plate (9).

2. The electric heating tube liquid heater according to claim 1, characterized in that, The steel plate (9) has a recess (11) which is welded to the heating tube (10). A steel pipe (12) is welded inside the recess (11). A temperature sensor (13) is installed inside the steel pipe (12). The temperature sensor (13) is electrically connected to the electrical component (8).

3. The electric heating tube liquid heater according to claim 1, characterized in that, The housing assembly (1) includes a housing (101) and a first cover plate (102). The partition plate (2) is disposed inside the housing (101). The first inner cavity (3) forms an opening at one end of the housing (101). The first cover plate (102) is detachably connected to one end of the housing (101). The first cover plate (102) has a plurality of protrusions on its end face facing the housing (101). The flow channel is formed between the protrusions and between the protrusions and the inner wall of the housing (101).

4. The electric heating tube liquid heater according to claim 3, characterized in that, The flow channel includes an inner flow channel (14) and an outer flow channel (15) located outside the inner flow channel (14). The plurality of protrusions include staggered first protrusions (16) and second protrusions (17). The inner flow channel (14) is formed between the first protrusion (16) and the second protrusion (17) and is W-shaped. The outer flow channel (15) is formed between the second protrusion (17) and the inner wall of the outer shell (101) and is U-shaped. One end of the inner flow channel (14) and one end of the outer flow channel (15) are connected to the liquid inlet (6). The other end of the inner flow channel (14) and the other end of the outer flow channel (15) are connected to the liquid outlet (7).

5. The electric heating tube liquid heater according to claim 3, characterized in that, A sealing structure is provided between the outer shell (101) and the first cover plate (102), and the sealing structure is arranged around the opening of the first inner cavity (3).

6. The electric heating tube liquid heater according to claim 1, characterized in that, A sealing structure is provided between the steel plate (9) and the partition (2), and the sealing structure is arranged around the through hole (5).

7. The electric heating tube liquid heater according to claim 5 or 6, characterized in that, The sealing structure is formed by FIPG sealant.

8. The electric heating tube liquid heater according to claim 1, characterized in that, The heating tubes (10) are two stacked together, and both ends of the two heating tubes (10) are welded to the steel plate (9).

9. The electric heating tube liquid heater according to claim 1, characterized in that, The inner wall of the flow channel is provided with a corrugated structure (19) along the flow channel direction.

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