An electric heating device for normal operation of a normal-temperature heat pipe in a low-temperature environment

Abstract

The application relates to the technical field of heating devices, in particular to an electric heating device capable of normally operating normal-temperature heat pipes in a low-temperature environment, which comprises a base, an outer shell, a heat-conducting piece, PTC ceramic heating sheets, a first fin group, a second fin group, normal-temperature heat pipes and a fan assembly, the heat-conducting piece comprises a lower heat-conducting plate and an upper heat-conducting plate, the PTC ceramic heating sheets are clamped between the lower heat-conducting plate and the upper heat-conducting plate; the first fin group comprises a plurality of first radiating fins connected to the upper surface of the upper heat-conducting plate, and the second fin group comprises a plurality of second radiating fins arranged side by side at intervals; the normal-temperature heat pipes are in L shapes, and a plurality of the normal-temperature heat pipes are arranged, and each of the normal-temperature heat pipes comprises a horizontal pipe segment press-fitted in a corresponding heat-conducting plate and a vertical pipe segment penetrating into the second radiating fin; the fan assembly comprises a fan fixing frame arranged between the first fin group and the second fin group and a fan, and is used for blowing the heat at the first fin group to the second fin group. The application can realize the normal operation of the normal-temperature heat pipes in the low-temperature environment and reduce the use cost.

Description

Technical Field

[0001] This invention relates to the field of heating device technology, and in particular to an electric heating device that enables a room-temperature heat pipe to operate normally in a low-temperature environment. Background Technology

[0002] A heat pipe utilizes the phase change process of a medium evaporating at the hot end and condensing at the cold end (i.e., utilizing the latent heat of vaporization and condensation of the liquid) to rapidly conduct heat. Based on their operating temperature, heat pipes can be classified into low-temperature heat pipes (-273~0℃), room-temperature heat pipes (0~250℃), medium-temperature heat pipes (250~450℃), and high-temperature heat pipes (450~1000℃). Currently, room-temperature heat pipes are commonly used for heat dissipation in automobiles. However, the driving environment of automobiles is complex and diverse, especially in winter. In Northeast China, outdoor temperatures can reach -30℃ or even lower, which is below the operating temperature of room-temperature heat pipes, preventing them from functioning properly. While low-temperature heat pipes can meet the requirements of these extreme environments, their complex manufacturing process and high operating costs prevent them from being widely used in automotive radiators. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide an electric heating device that enables a room temperature heat pipe to operate normally in a low temperature environment, thereby achieving normal operation of the room temperature heat pipe in a low temperature environment and reducing the cost of use.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An electric heating device that enables a room-temperature heat pipe to operate normally in a low-temperature environment includes:

[0006] The base is defined by its length direction as the left-right direction and its width direction as the front-back direction.

[0007] The heat-conducting component includes a lower heat-conducting plate and an upper heat-conducting plate fixed on the base;

[0008] The PTC ceramic heating element is sandwiched between the lower heat-conducting plate and the upper heat-conducting plate. After being powered on, the PTC ceramic heating element generates heat and transfers heat to the lower heat-conducting plate and the upper heat-conducting plate.

[0009] The first fin group includes multiple first heat dissipation fins connected to the upper surface of the upper heat conduction plate and arranged side by side at intervals in the left-right direction, and the first heat dissipation fins extend in the up-down direction.

[0010] The second fin group includes multiple second heat dissipation fins arranged side by side at intervals in the vertical direction. The second heat dissipation fins extend in the horizontal direction. The second heat dissipation fins and the first heat dissipation fins are located on the front and rear sides of the upper heat conduction plate, respectively.

[0011] The room temperature heat pipe is L-shaped and has multiple sections, including horizontal and vertical sections. The horizontal sections are press-fitted into the corresponding heat-conducting plates, and the vertical sections are inserted into the second heat dissipation fins.

[0012] A fan assembly includes a fan mount and a fan disposed between a first fin group and a second fin group. The fan is mounted on the fan mount and is used to blow heat from the first fin group to the second fin group.

[0013] The outer casing is mounted on the base, and multiple heat dissipation holes are provided on the outer casing corresponding to the positions of the first fin group, the second fin group, and the room temperature heat pipe.

[0014] The beneficial effects of the above technical solution are as follows: The PTC ceramic heating element generates heat after being energized. This heat is transferred through the upper and lower heat-conducting plates. Since the horizontal section of the room-temperature heat pipe is press-fitted into the corresponding heat-conducting plate, the heat generated by the PTC ceramic heating element can be transferred to the horizontal section through the corresponding heat-conducting plate, thus heating the horizontal section of the room-temperature heat pipe. The heat is transferred through the upper heat-conducting plate to the first and second fin groups on the front and rear sides, and then through the second fin group to the vertical section of the room-temperature heat pipe. Furthermore, since the fan is located between the first and second fin groups, when the fan is turned on, it can draw hot air from the first heat dissipation fins and further heat the vertical section at the fan outlet. The combined heat from both locations allows the room-temperature heat pipe to reach its normal starting temperature for normal heat conduction. The electric heating device of this invention can heat the room-temperature heat pipe simultaneously during normal heating, ensuring its normal operation in low-temperature environments, eliminating the need for a low-temperature heat pipe, and saving costs.

[0015] Furthermore, the upper surface of the lower heat-conducting plate is provided with an upper groove corresponding to each room-temperature heat pipe, and the horizontal section of the room-temperature heat pipe is interference-fitted into the upper groove, the upper surface of the horizontal section being a plane flush with the upper surface of the lower heat-conducting plate; or the lower surface of the upper heat-conducting plate is provided with a lower groove corresponding to each room-temperature heat pipe, and the horizontal section of the room-temperature heat pipe is interference-fitted into the lower groove, the lower surface of the horizontal section being a plane flush with the lower surface of the lower heat-conducting plate.

[0016] Beneficial effects: On the one hand, it facilitates the assembly of horizontal pipe sections and increases the contact area between the horizontal pipe sections and the heat-conducting plate and PTC ceramic heating element. On the other hand, the horizontal pipe sections can directly contact the PTC ceramic heating element to transfer heat, avoiding heat loss.

[0017] Furthermore, reinforcing heat pipes are respectively installed on the left and right sides of the first fin assembly, and the bottom of the reinforcing heat pipes is fixedly connected to the upper surface of the lower heat-conducting plate.

[0018] Beneficial effect: It can enhance the heat conduction effect at the first fin assembly.

[0019] Furthermore, the enhanced heat pipe is U-shaped and includes an upper horizontal section, a lower horizontal section, and a vertical connecting section. The lower horizontal section and the upper horizontal section pass through multiple first heat dissipation fins, respectively. The bottom of the lower horizontal section is fixedly connected to the upper surface of the lower heat conduction plate, and the vertical connecting section is located outside the first fin group.

[0020] Beneficial effects: The use of U-shaped enhanced heat pipes ensures sufficient contact with both the upper heat-conducting plate and the first heat dissipation fins, resulting in good heat transfer.

[0021] Furthermore, the first heat dissipation fin is provided with a clearance groove for the lower horizontal section to pass through and a first through hole for the upper horizontal section to pass through, and a first connecting hole communicating with the first through hole is provided on the first heat dissipation fin at the position corresponding to the first through hole; the second heat dissipation fin is provided with a second through hole for the vertical pipe section to pass through, and a second connecting hole or connecting notch communicating with the second through hole is provided on the second heat dissipation fin at the position corresponding to the second through hole.

[0022] Beneficial effects: Solder paste can be added to the first connecting hole, the second connecting hole, or the connecting notch, which facilitates the fixation between the heat pipe and the first heat dissipation fin, and between the heat pipe at room temperature and the second heat dissipation fin.

[0023] Furthermore, the second fin group is provided with at least two groups spaced apart in the left-right direction, and the arrangement length of the first heat dissipation fins in the left-right direction is not less than the sum of the arrangement lengths of the second heat dissipation fins in each second fin group in the left-right direction.

[0024] Beneficial effects: The appropriate number of second fin groups can be selected according to the actual installation space, and the fan can blow all the hot air from the first fin group to the second heat dissipation fins to ensure the heating of the vertical section of the room temperature heat pipe, so that the room temperature heat pipe can be heated to the start-up temperature.

[0025] Furthermore, both the lower heat-conducting plate and the upper heat-conducting plate are aluminum plates.

[0026] Beneficial effects: Aluminum plates have good thermal conductivity, are lightweight, and have low cost.

[0027] Furthermore, the fan mounting bracket includes a mounting plate and flaps integrally formed on the left, right and top sides of the mounting plate. The mounting plate and each flap form a positioning groove for positioning the second fin group. The fan is fixed on the side of the mounting plate facing away from the second fin group. The mounting plate is provided with a suitable ventilation hole corresponding to the position of the fan.

[0028] Beneficial effects: It ensures the structural strength of the fan mounting bracket and enables the positioning of the second fin assembly.

[0029] Furthermore, the bottom of the mounting plate is provided with clearance openings to avoid the upper heat-conducting plate, the lower heat-conducting plate and the PTC ceramic heating element, and the plate sections on both sides of the clearance openings of the mounting plate are fixedly connected to the base.

[0030] Beneficial effects: The mounting plate is directly fixed to the base, which increases the reliability of the connection. At the same time, the mounting plate does not directly contact the upper and lower heat conduction plates, so it will not affect the heat transfer here. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external shape of the electric heating device of the present invention that enables a room temperature heat pipe to operate normally in a low temperature environment;

[0032] Figure 2 yes Figure 1 A schematic diagram of one of the perspectives after removing the outer shell;

[0033] Figure 3 yes Figure 1 A schematic diagram from another perspective after removing the outer shell;

[0034] Figure 4 yes Figure 2 Schematic diagram of the structure of the first fin group;

[0035] Figure 5 yes Figure 3 Schematic diagram of the structure of the second fin group in the middle;

[0036] Figure 6 yes Figure 3 Schematic diagram of a medium-temperature heat pipe;

[0037] Figure 7 This is a schematic diagram showing the assembly relationship between the room temperature heat pipe, the lower heat-conducting plate, and the second fin assembly in the electric heating device of the present invention that enables the room temperature heat pipe to operate normally in a low temperature environment.

[0038] Figure 8 yes Figure 2 A schematic diagram of the structure of the central fan mounting bracket.

[0039] Reference numerals: 1-Outer shell, 2-Base, 3-Lower heat conduction plate, 4-Upper heat conduction plate, 5-First heat dissipation fin, 6-Second heat dissipation fin, 7-Fan mounting bracket, 8-Fan, 9-Room temperature heat pipe, 10-Allowing groove, 11-First perforation, 12-Second perforation, 13-First connecting hole, 14-Connecting notch, 15-Mounting plate, 16-Ventilation hole, 17-Allowing opening, 18-Flip plate, 19-Upper groove, 20-Horizontal pipe section, 21-Vertical pipe section, 22-PTC ceramic heating element, 23-Heat dissipation hole, 24-Reinforced heat pipe. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0041] Specific embodiments of the electric heating device of the present invention that enables a room-temperature heat pipe to operate normally in a low-temperature environment:

[0042] like Figure 1 , Figure 2 and Figure 3 As shown, the electric heating device that enables the room temperature heat pipe to operate normally in a low temperature environment includes a base 2, an outer shell 1 fixed on the base, and heat-conducting components, PTC ceramic heating elements 22, a first fin group, a second fin group, a room temperature heat pipe 9, and a fan assembly installed inside the outer shell 1.

[0043] Specifically, the electric heating device of the present invention is installed at the base of the bus seat for heating the bus. During installation, as follows... Figure 1 The horizontal fixation is achieved in a manner similar to that used in this embodiment. However, for ease of description, in this embodiment, it is referred to as... Figure 2 and Figure 3 The directions shown in the figures define the length direction of base 2 as the left-right direction and the width direction of base 2 as the front-back direction. It should be noted that in the description of the invention, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," and "horizontal," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the figures. This is merely for ease of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, it should not be construed as a limitation of the invention.

[0044] In this embodiment, the heat-conducting components include a lower heat-conducting plate 3 and an upper heat-conducting plate 4 fixed on the base 2. To facilitate heat transfer, both the lower heat-conducting plate 3 and the upper heat-conducting plate 4 are made of aluminum plates, achieving a balance between thermal conductivity and light weight. The PTC ceramic heating element 22 is existing technology and generates heat when energized. The PTC ceramic heating element 22 is sandwiched between the lower heat-conducting plate 3 and the upper heat-conducting plate 4, and is in close contact with both plates. Bolts pass through the upper heat-conducting plate 4 and the lower heat-conducting plate 3, serving to fix the upper heat-conducting plate 4 and the lower heat-conducting plate 3, and also clamping the PTC ceramic heating element 22. The heat generated by the PTC ceramic heating element 22 can be transferred to the lower heat-conducting plate 3 and the upper heat-conducting plate 4.

[0045] like Figure 2 and Figure 4 As shown, the first fin group includes multiple first heat dissipation fins 5 connected to the upper surface of the upper heat conduction plate 4 and arranged side by side at intervals in the left-right direction. The first heat dissipation fins 5 extend in the up-down direction, and the tops of each first heat dissipation fin 5 are also connected together.

[0046] like Figure 3 and Figure 5As shown, two sets of second fin groups are spaced apart in the left-right direction. Each set includes multiple second heat dissipation fins 6 arranged side-by-side and spaced apart in the up-down direction. The second heat dissipation fins 6 extend in the left-right direction, and the individual second heat dissipation fins 6 in each set are connected together. The second heat dissipation fins 6 and the first heat dissipation fins 5 are located on the front and rear sides of the upper heat-conducting plate 4, respectively, and the length of the first heat dissipation fins 5 in the left-right direction is greater than the sum of the lengths of the second heat dissipation fins 6 in the left-right direction in the two second fin groups.

[0047] like Figure 7 As shown, the upper surface of the lower heat-conducting plate 3 is provided with multiple upper grooves 19 arranged at intervals along the left-right direction, and the number of room-temperature heat pipes 9 is the same as the number of upper grooves 19. Figure 6 As shown, the room-temperature heat pipe 9 is bent into an L-shape, including a horizontal section 20 and a vertical section 21. The horizontal section 20 is mechanically press-fitted into the corresponding upper groove 19 with an interference fit. The upper surface of the horizontal section 20 is a plane flush with the upper surface of the lower heat-conducting plate 3, at which point the horizontal section 20 is in contact with the PTC ceramic heating element. The vertical section 21 is inserted into the second heat dissipation fin 6. In this embodiment, as shown... Figure 5 As shown, each second fin group is equipped with twelve room-temperature heat pipes 9. Each second heat dissipation fin 6 has a second through hole 12 for the vertical pipe sections 21 of the twelve room-temperature heat pipes 9 to pass through. A connecting notch 14 corresponding to the second through hole 12 is provided on the second heat dissipation fin 6. Solder paste can be added to the connecting notch 14 to fix the vertical pipe sections 21 to each second heat dissipation fin 6. Of course, the number of room-temperature heat pipes can be adjusted according to the size of the second heat dissipation fins 6.

[0048] like Figure 2 and Figure 3 As shown, the fan assembly includes a fan mount 7 and a fan 8 disposed between the first fin group and the second fin group. The fan 8 is mounted on the fan mount 7 and is used to blow heat from the first fin group to the second fin group. Figure 8As shown, the fan mounting bracket 7 includes a mounting plate 15 and flaps 18 integrally formed on the left, right, and top sides of the mounting plate 15. The bottom of the mounting plate 15 has clearance openings 17 to allow passage of the upper heat-conducting plate 4, lower heat-conducting plate 3, and PTC ceramic heating element 22, with certain gaps maintained between the mounting plate 15 and these components. The plate sections on either side of the clearance openings 17 are fixedly connected to the base 2. The flaps 18 improve the structural strength of the fan mounting bracket 7. The mounting plate 15 and each flap 18 form a positioning groove for positioning the second fin assembly, which is located within the positioning groove. Four fans 8 are provided, each fixed to the side of the mounting plate 15 facing away from the second fin assembly by bolts. The mounting plate 15 has corresponding ventilation holes 16 for each fan 8. Of course, in actual use, the number of fans can be adjusted according to the specific dimensions.

[0049] like Figure 1 As shown, multiple heat dissipation holes 23 are provided on the outer shell 1 at the positions corresponding to the first fin group, the second fin group and the room temperature heat pipe 9. The heat dissipation holes 23 can dissipate the heat inside the outer shell 1.

[0050] It should be noted that in actual use, the PTC ceramic heating elements of the electric heating device of this invention are connected in parallel, using 600V DC high-voltage electricity, and connected to the vehicle interior via a high-voltage wiring harness. The fans are connected in parallel, using 24V DC low-voltage electricity supplied from the vehicle interior, and connected to the vehicle interior via an Ampere plug.

[0051] To further improve the thermal conductivity, such as Figure 2 As shown, reinforcing heat pipes 24 are respectively installed on the left and right sides of the first fin assembly. These reinforcing heat pipes 24 are also room-temperature heat pipes. In this embodiment, the reinforcing heat pipes 24 are U-shaped, including an upper horizontal section, a lower horizontal section, and a vertical connecting section, as shown below. Figure 4 As shown, the first heat dissipation fin 5 is provided with a clearance groove 10 for the lower horizontal section to pass through and a first through hole 11 for the upper horizontal section to pass through. A first connecting hole 13, corresponding to the position of the first through hole 11, is provided on the first heat dissipation fin 5, communicating with the first through hole 11. Solder paste can be added to the first connecting hole 13, thereby fixing the upper horizontal section to the first heat dissipation fin 5 together. The bottom of the lower horizontal section is fixedly connected to the upper surface of the lower heat-conducting plate 3, and the vertical connecting section is located on the outside of the first fin assembly.

[0052] The working principle of the electric heating device of the present invention is as follows: In a low-temperature environment, the PTC ceramic heating element 22 is energized, and the PTC ceramic heating element 22 generates heat after being energized. The heat is transferred through the upper heat-conducting plate 4 and the lower heat-conducting plate 3. Since the horizontal pipe section 20 of the room temperature heat pipe 9 is in contact with the PTC ceramic heating element 22, the heat generated by the PTC ceramic heating element 22 can be directly transferred to the horizontal pipe section 20 to heat the horizontal pipe section 20 of the room temperature heat pipe. In addition, the heat is transferred through the upper heat-conducting plate 4 to the first fin group and the second fin group on the front and rear sides, and then transferred to the vertical pipe section 21 of the room temperature heat pipe through the second fin group. Since the fan 8 is located between the first fin group and the second fin group, when the fan 8 is turned on, the fan 8 can draw hot air from the first heat dissipation fin 5 and blow this hot air to the vertical pipe section 21 at the air outlet of the fan 8 to further heat the vertical pipe section 21. The heat from the two places is superimposed, and finally the room temperature heat pipe can reach the normal starting temperature for normal heat conduction in a low-temperature environment.

[0053] The electric heating device of the present invention can heat the room temperature heat pipe 9 while heating normally, ensuring the normal operation of the room temperature heat pipe 9 in low temperature environment, eliminating the need to use a low temperature heat pipe and saving costs.

[0054] In other embodiments, recesses may be provided only on the lower surface of the upper heat-conducting plate corresponding to each room-temperature heat pipe. The horizontal sections of the room-temperature heat pipes are interference-fitted into the recesses, and the lower surface of the horizontal sections is a plane flush with the lower surface of the lower heat-conducting plate. Of course, in actual installation, recesses may be provided on both the lower surface of the upper heat-conducting plate and the upper surface of the lower heat-conducting plate, in which case the room-temperature heat pipes alternate up and down in the left-right direction.

[0055] In other embodiments, copper plates may be used for the upper and lower heat-conducting plates if the weight of the device itself is not taken into account.

[0056] In other embodiments, when the thermal conductivity is already good, it is not necessary to install a heat pipe.

[0057] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An electric heating device that enables a room-temperature heat pipe to operate normally in a low-temperature environment, characterized in that, include: The base is defined by its length direction as the left-right direction and its width direction as the front-back direction. The heat-conducting component includes a lower heat-conducting plate and an upper heat-conducting plate fixed on the base; The PTC ceramic heating element is sandwiched between the lower heat-conducting plate and the upper heat-conducting plate. After being powered on, the PTC ceramic heating element generates heat and transfers heat to the lower heat-conducting plate and the upper heat-conducting plate. The first fin group includes multiple first heat dissipation fins connected to the upper surface of the upper heat conduction plate and arranged side by side at intervals in the left-right direction, and the first heat dissipation fins extend in the up-down direction. The second fin group includes multiple second heat dissipation fins arranged side by side at intervals in the vertical direction. The second heat dissipation fins extend in the horizontal direction. The second heat dissipation fins and the first heat dissipation fins are located on the front and rear sides of the upper heat conduction plate, respectively. The room temperature heat pipe is L-shaped and has multiple sections, including horizontal and vertical sections. The horizontal sections are press-fitted into the corresponding heat-conducting plates, and the vertical sections are inserted into the second heat dissipation fins. A fan assembly includes a fan mount and a fan disposed between a first fin group and a second fin group. The fan is mounted on the fan mount and is used to blow heat from the first fin group to the second fin group. The outer casing is mounted on the base, and multiple heat dissipation holes are provided on the outer casing corresponding to the positions of the first fin group, the second fin group and the room temperature heat pipe. The upper surface of the lower heat-conducting plate is provided with an upper groove corresponding to each room temperature heat pipe. The horizontal pipe section of the room temperature heat pipe is interference-fitted into the upper groove, and the upper surface of the horizontal pipe section is a plane flush with the upper surface of the lower heat-conducting plate. Alternatively, the lower surface of the upper heat-conducting plate may be provided with a lower groove corresponding to each room temperature heat pipe, and the horizontal pipe section of the room temperature heat pipe may be interference-fitted into the lower groove, with the lower surface of the horizontal pipe section being a plane flush with the lower surface of the lower heat-conducting plate. Reinforcing heat pipes are installed on the left and right sides of the first fin assembly, and the bottom of the reinforcing heat pipes is fixedly connected to the upper surface of the lower heat conduction plate. Both the lower heat-conducting plate and the upper heat-conducting plate are aluminum plates; The fan mounting bracket includes a mounting plate and flaps integrally formed on the left, right and top sides of the mounting plate. The mounting plate and each flap form a positioning groove for positioning the second fin group. The fan is fixed on the side of the mounting plate facing away from the second fin group. The mounting plate is provided with a suitable ventilation hole at the position corresponding to the fan. The bottom of the mounting plate is provided with clearance openings to allow the upper heat-conducting plate, lower heat-conducting plate and PTC ceramic heating element to pass. The plate sections on both sides of the clearance openings are fixedly connected to the base.

2. The electric heating device according to claim 1 for enabling a room-temperature heat pipe to operate normally in a low-temperature environment, characterized in that, The enhanced heat pipe is U-shaped and includes an upper horizontal section, a lower horizontal section and a vertical connecting section. The lower horizontal section and the upper horizontal section pass through multiple first heat dissipation fins respectively. The bottom of the lower horizontal section is fixedly connected to the upper surface of the lower heat conduction plate, and the vertical connecting section is located outside the first fin group.

3. The electric heating device according to claim 2 for enabling a room-temperature heat pipe to operate normally in a low-temperature environment, characterized in that, The first heat dissipation fin has a clearance groove for the lower horizontal section to pass through and a first through hole for the upper horizontal section to pass through. The first heat dissipation fin has a first connecting hole corresponding to the first through hole and communicating with the first through hole. The second heat dissipation fin has a second through hole for the vertical pipe section to pass through. The second heat dissipation fin has a second connecting hole or connecting notch corresponding to the second through hole and communicating with the second through hole.

4. The electric heating device according to any one of claims 1-3, which enables a room-temperature heat pipe to operate normally in a low-temperature environment, is characterized in that, The second fin group is provided with at least two groups spaced apart in the left and right direction, and the length of the first heat dissipation fins in the left and right direction is not less than the sum of the lengths of the second heat dissipation fins in each second fin group in the left and right direction.

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