Membrane heating device with snakelike runner

Abstract

The utility model discloses a membrane heating device with a snakelike flow channel, which comprises a membrane heating unit and a flow channel unit which are fixedly connected together, the flow channel unit comprises a water inlet box body and a water outlet box body which are arranged at an interval, one end of the water inlet box body is a water inlet end, and the other end of the water inlet box body is a closed end. One end of the water outlet box body is a water outlet end, the other end of the water outlet box body is a closed end, water inlet branch ports and water outlet branch ports are uniformly formed in the sides, close to each other, of the water inlet box body and the water outlet box body respectively, the number of the water inlet branch ports is equal to that of the water outlet branch ports, and each water inlet branch port and each water outlet branch port are arranged correspondingly; a coiled pipe is connected between each water inlet branch port and each water outlet branch port, the two ends of each coiled pipe are communicated with the water inlet branch ports and the water outlet branch ports respectively, the coiled pipes are located on the same plane, one side of each coiled pipe makes contact with the membrane heating unit, a cover plate is fixed to the position, located on the other side of the coiled pipe, of the flow channel unit, and the cover plate is fixed to the position, located on the other side of the coiled pipe, of the flow channel unit. And a gap is formed between the cover plate and the coiled pipe.

Description

Technical Field

[0001] The utility model relates to a membrane heating device with a serpentine flow channel, belonging to the technical field of membrane heaters. Background Art

[0002] To ensure the comfort of passengers and the performance of batteries in cold seasons, electric vehicles usually adopt electric heating to meet the heating requirements of the cockpit and battery packs. PTC heating and membrane heating are two common electric heating methods. The PTC heating scheme uses a semiconductor made of ceramic material as the heating element, and its resistance increases with the increase in temperature. The relationship between the resistance of the PTC heating element and temperature shows a trend of first decreasing and then increasing, so as to achieve automatic control of the maximum temperature. However, when initially turned on, due to the low resistance, a large current will be generated, resulting in a short-term surge current. The membrane heating scheme is to sinter insulating media, heating resistors and other materials onto a specific base metal at high temperature to form a heating film with a thickness between 0.2 mm and 3 mm. The membrane heating technology has the advantages of small volume and light weight, and can better match the layout of the whole vehicle.

[0003] However, the internal flow channel design of the existing membrane heaters is unreasonable, the heat exchange efficiency is low, and there are also disadvantages such as high cost, high weight and easy leakage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a membrane heating device with a serpentine flow channel to solve the technical problems of unreasonable internal flow channel design and low heat exchange efficiency of the existing membrane heating devices.

[0005] The utility model adopts the following technical scheme: A membrane heating device with a serpentine flow channel includes a membrane heating unit and a flow channel unit fixedly connected together. The flow channel unit includes a water inlet tank body and a water outlet tank body arranged at intervals. One end of the water inlet tank body is the water inlet end and the other end is the closed end. One end of the water outlet tank body is the water outlet end and the other end is the closed end. The sides of the water inlet tank body and the water outlet tank body close to each other are respectively evenly provided with water inlet branch ports and water outlet branch ports. The number of the water inlet branch ports and the water outlet branch ports is equal. Each water inlet branch port and each water outlet branch port are respectively arranged in correspondence. A serpentine pipe is respectively connected between each water inlet branch port and each water outlet branch port. The two ends of the serpentine pipe are respectively communicated with the water inlet branch port and the water outlet branch port. Each serpentine pipe is located on the same plane. One side of the serpentine pipe is in contact with the membrane heating unit. A cover plate is fixed at a position on the other side of the serpentine pipe of the flow channel unit, and there is a gap between the cover plate and the serpentine pipe.

[0006] The water inlet branch ports and the water outlet branch ports are staggered, and each serpentine pipe includes two elbows and three straight pipe segments.

[0007] The water inlet end of the water inlet tank body and the water outlet end of the water outlet tank body are both located on the same side of the flow channel unit.

[0008] The main bodies of the water inlet tank body and the water outlet tank body are both square pipes, and the water inlet end and the water outlet end are both round pipes.

[0009] The cover plate is welded to the water inlet tank body and the water outlet tank body.

[0010] The cover plate is a composite aluminum plate with a solder layer on its surface.

[0011] The membrane heating unit is fixedly connected to the flow channel unit by means of bolt connection or welding.

[0012] The membrane heating unit includes a metal substrate and a heating film fixed on the metal substrate.

[0013] The flow channel unit is made of metal.

[0014] The flow channel unit adopts a semi-closed structure or a fully closed structure.

[0015] The beneficial effects of the present utility model are as follows: When the present utility model is in use, the medium (the medium is not limited to water, antifreeze, oil, etc.) enters the water inlet tank body through the water inlet end, and the medium uniformly enters each serpentine pipe through each water inlet branch of the water inlet tank body, flows to the water outlet tank body on the other side through the water outlet branch, and then flows out from the water outlet end. When the membrane heating unit works, the temperature of the membrane heating unit will rise extremely rapidly, and the heat quickly transfers from the high-temperature area of the heating unit to the low-temperature area of the serpentine pipe. Since there is a continuous flow of medium inside the serpentine pipe, the medium liquid inside the serpentine pipe is finally rapidly heated. The present utility model can make full use of the structural advantage of the large area of the serpentine structure to rapidly heat the internal medium, and solve the technical problems of low heat exchange efficiency, high cost, high weight, and easy leakage of the existing membrane heater.

[0016] As a preferred solution, the water inlet branches and the water outlet branches are staggered, which is convenient for the neat arrangement of the serpentine pipes and is beneficial to processing and manufacturing.

[0017] As a preferred solution, the water inlet end and the water outlet end are located on the same side, and the medium flows more rapidly.

[0018] As a preferred solution, the main bodies of the water inlet tank body and the water outlet tank body are both square pipes, which is convenient for the welding of the membrane heating unit and the cover plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of a membrane heating device with a serpentine flow channel according to an embodiment of the present utility model;

[0020] Figure 2 is Figure 1 the split schematic diagram of

[0021] Figure 3 isFigure 1 Stereogram of the middle flow channel unit;

[0022] Figure 4 is Figure 3 front view of;

[0023] Figure 5 is Figure 3 rear view of;

[0024] Figure 6 is Figure 1 schematic diagram of the middle film heating unit;

[0025] Figure 7 is Figure 1 schematic diagram of the middle cover plate.

[0026] In the figure: 1 - film heating unit, 1.1 - metal substrate, 1.2 - heating film, 2 - flow channel unit, 3 - water inlet tank body, 3.1 - water inlet end, 3.2 - water inlet branch port, 4 - water outlet tank body, 4.1 - water outlet end, 4.2 - water outlet branch port, 5 - serpentine tube, 6 - cover plate. Specific implementation manner

[0027] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] As Figures 1 to 7 shown, the film heating device with a serpentine flow channel in this embodiment includes a film heating unit 1 and a flow channel unit 2 fixedly connected together. The flow channel unit 2 includes a water inlet tank body 3 and a water outlet tank body 4 arranged at intervals. One end of the water inlet tank body 3 is a water inlet end 3.1 and the other end is a closed end. One end of the water outlet tank body 4 is a water outlet end 4.1 and the other end is a closed end. The sides of the water inlet tank body 3 and the water outlet tank body 4 close to each other are respectively and evenly provided with a water inlet branch port 3.2 and a water outlet branch port 4.2. The number of the water inlet branch ports 3.2 and the water outlet branch ports 4.2 is equal. Each water inlet branch port 3.2 and each water outlet branch port 4.2 are correspondingly arranged. A serpentine tube 5 is respectively connected between each water inlet branch port 3.2 and each water outlet branch port 4.2. The two ends of the serpentine tube 5 are respectively communicated with the water inlet branch port 3.2 and the water outlet branch port 4.2. Each serpentine tube 5 is located on the same plane. One side of the serpentine tube 5 is in contact with the film heating unit 1. A cover plate 6 is fixedly arranged on the other side of the flow channel unit 2 where the serpentine tube 5 is located, and there is a gap between the cover plate 6 and the serpentine tube 5.

[0029] The water inlet branch ports 3.2 and the water outlet branch ports 4.2 are distributed alternately. Each serpentine pipe 5 includes two elbows and three straight pipe sections. In other embodiments, the arrangement of the serpentine pipes 5 is not limited to circular, semi-circular, rectangular, elliptical, zigzag, etc. The material of the serpentine pipes 5 is a metal material, not limited to materials such as aluminum alloy, iron, stainless steel, copper, and titanium alloy. The serpentine pipes are arranged between the left and right inlet water tank bodies and the outlet water tank bodies through processes such as die casting, welding, and extrusion, and have the characteristics of high heat conduction efficiency, large heat dissipation area, high heat conversion rate, and high safety performance. The heat generated by the heating unit can make full use of its large heat dissipation area advantage through the serpentine pipe structure to quickly heat the internal medium.

[0030] The water inlet end 3.1 of the inlet water tank body 3 and the water outlet end 4.1 of the outlet water tank body 4 are both located on the same side of the flow channel unit 2. The main bodies of the inlet water tank body 3 and the outlet water tank body 4 are both square pipes, and the water inlet end 4.1 and the water outlet end 4.2 are both round pipes. The flow channel unit 2 adopts a semi-closed structure or a fully closed structure. The flow channel unit 2 is made of metal, such as cast aluminum, cast iron, titanium alloy, aluminum profiles, etc. Taking aluminum alloy ADC12 or profile G77 as an example, it has the advantages of high thermal conductivity coefficient and being convenient for quickly dissipating heat.

[0031] The film heating unit 1 includes a metal substrate 1.1 and a heating film 1.2 fixed on the metal substrate 1.1. The material of the metal substrate 1.1 is not limited to stainless steel, iron, and aluminum alloy. The heating film 1.2 is sintered or printed on the metal substrate, and the material of the heating film 1.2 is not limited to ceramics, metals, glass, etc. The film heating unit 1 is fixedly connected to the flow channel unit 2 by means of bolt connection or welding. In this embodiment, the film heating unit 1 and the flow channel unit 2 are tightly attached together by means of bolt fixation.

[0032] The cover plate 6 is a composite aluminum plate with a solder layer on its surface. The solder layer uses aluminum alloy solder, and the cover plate is brazed and welded to the flow channel unit to achieve overall sealing or semi-sealing. The cover plate 6 is welded to the inlet water tank body 3 and the outlet water tank body 4. The cover plate 6 is welded to the flow channel unit 2 through a brazing process.

[0033] The working principle of the present utility model: The medium (the medium is not limited to water, antifreeze, oil, etc.) enters the inlet water tank body through the water inlet end. The medium evenly enters each serpentine pipe through the water inlet branch ports of the inlet water tank body, flows to the outlet water tank body on the other side through the water outlet branch ports, and then flows out from the water outlet end. When the film heating unit works, the temperature of the film heating unit will rise extremely rapidly, and the heat is quickly transferred from the high-temperature area of the heating unit to the low-temperature area of the serpentine pipe. Since there is a continuous flow of medium inside the serpentine pipe, the medium liquid inside the serpentine pipe is finally quickly heated. The film heating device with a serpentine flow channel of the present utility model has the advantages of high heat exchange efficiency, large heat dissipation area, light weight, low cost, and simple assembly process.

[0034] The utility model is a high-efficiency water heater device with a serpentine flow channel structure, which can make full use of the structural advantages of the large area of the serpentine structure to quickly heat the internal medium liquid, and overcomes the disadvantages of the current membrane heater, such as low heat exchange efficiency, high cost, high weight, and easy leakage.

[0035] The welding process of the flow channel unit and the cover plate includes the following steps: spraying the brazing flux on the cover plate with the composite layer, placing the cover plate on one side of the opening of the flow channel unit (that is, Figure 3 the back side in it), where the flow channel housing is a cast aluminum part or a profile part without composite layer solder. Press the cover plate tightly against the opening side of the flow channel unit, and realize the fitting of the cover plate and the flow channel unit through fasteners or jigs. Put the sub-assembly assembled by the cover plate and the flow channel unit into a brazing furnace (or a vacuum brazing furnace). After introducing a protective atmosphere, raise the furnace temperature of the brazing furnace to 570-700 °C, keep it for 5-30 minutes and then cool it with the furnace. After taking it out after the welding is completed, pure nitrogen atmosphere protection can be used in the brazing furnace, or nitrogen-hydrogen atmosphere protection can also be used. The dew point of the brazing furnace is -50 °C, and the oxygen concentration is controlled at 100 ppm and below, which can ensure the reduction of the appearance of oxide films during the brazing process. The concentration of the brazing flux is set at 20%, which can effectively break the oxide film on the surface of the solder composite layer of the cover plate, help the solder to flow, and ensure the welding quality. After the welding is completed, assemble the membrane heating unit to the other side of the serpentine flow channel and fasten it with bolts to finally form the heater structure assembly. (Note: If the membrane heating unit is connected to the flow channel unit through a welding process, the welding process is the same as the welding process of the cover plate and the flow channel).

[0036] Preferably, the concentration of the brazing flux is 5% - 30%. The brazing flux with a concentration of 5% - 30% can effectively break the oxide film on the surface of the solder composite layer and enable the solder to flow.

[0037] Preferably, the dew point of the brazing furnace is -70 °C to -40 °C; the oxygen concentration in the brazing furnace is less than or equal to 100 ppm. The limitation of the oxygen concentration reduces the oxide film on the solder composite layer when the cover plate and the flow channel housing are welded, ensures the welding quality, makes the welding relationship between the cover plate and the flow channel unit stable, and will not fall off easily.

[0038] The above embodiments are preferred embodiments of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the utility model claimed.

Claims

1. A membrane heating device with a serpentine flow channel, comprising a membrane heating unit and a flow channel unit fixedly connected together, characterized in that: The flow channel unit includes a water inlet tank body and a water outlet tank body arranged at intervals. One end of the water inlet tank body is the water inlet end and the other end is the closed end. One end of the water outlet tank body is the water outlet end and the other end is the closed end. On the sides of the water inlet tank body and the water outlet tank body close to each other, water inlet branch ports and water outlet branch ports are evenly provided respectively. The number of the water inlet branch ports and the water outlet branch ports is equal. Each water inlet branch port and each water outlet branch port are correspondingly arranged. A serpentine pipe is connected between each water inlet branch port and each water outlet branch port. The two ends of the serpentine pipe are respectively communicated with the water inlet branch port and the water outlet branch port. Each serpentine pipe is located on the same plane. One side of the serpentine pipe is in contact with the membrane heating unit. A cover plate is fixed at the other side position of the serpentine pipe of the flow channel unit, and there is a gap between the cover plate and the serpentine pipe.

2. The membrane heating device with a serpentine flow channel according to claim 1, wherein: The water inlet branch ports and the water outlet branch ports are staggered. Each serpentine pipe includes two elbows and three straight pipe sections.

3. The membrane heating device with a serpentine flow channel according to claim 1, wherein: The water inlet end of the water inlet tank body and the water outlet end of the water outlet tank body are both located on the same side of the flow channel unit.

4. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The main bodies of the water inlet tank body and the water outlet tank body are both square pipes, and the water inlet end and the water outlet end are both round pipes.

5. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The cover plate is welded to the water inlet tank body and the water outlet tank body.

6. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The cover plate is a composite aluminum plate with a solder layer on the surface.

7. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The membrane heating unit is fixedly connected to the flow channel unit by means of bolt connection or welding.

8. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The membrane heating unit includes a metal substrate and a heating film fixed on the metal substrate.

9. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The flow channel unit is made of metal.

10. The membrane heating device with a serpentine flow channel according to claim 1, characterized in that: The flow channel unit adopts a semi-closed structure or a fully closed structure.

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