A double-sided film heater core structure

Abstract

The utility model discloses a double -faced film heater core body structure. It includes the cavity in the middle part, and the left and right ends of the front side of cavity are equipped with water inlet and water outlet respectively, the upper and lower surface of cavity is closed by upper base plate and lower base plate respectively, and is equipped with the radiating column of inserting into the cavity on upper base plate and lower base plate, and the upper surface of upper base plate is sequentially laminated to be provided with the upper thick film heating layer including the first layer sintered low temperature glass layer, silver electrode conductor layer, resistance heating layer and the second layer sintered low temperature glass layer, and the lower surface of lower base plate is equipped with the lower thick film heating layer with the mutual symmetry of upper thick film heating layer. Advantage is: realized double -faced heating simultaneously, and when fluid flows along the water drop type flow channel in the cavity, can receive the heat radiation and the counterflow heat exchange effect of two sides simultaneously, and the heat exchange efficiency and the thermal response speed are improved greatly, and the temperature gradient is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of water heating heaters for new energy vehicles, and in particular relates to a double-film heater core. Background Technology

[0002] With the popularization of new energy vehicles, vehicle thermal management systems are gradually developing towards higher efficiency, lighter weight, and integration. Among them, the water heater, as a key heat source component of the electric drive system, power battery, and passenger compartment, directly affects the vehicle's energy consumption and thermal comfort. Existing new energy vehicles generally use PTC ceramic heating elements or stainless steel thick-film heating elements as heat sources, and achieve heat exchange through the circulation of coolant in the flow channel.

[0003] However, existing PTC and stainless steel thick-film heaters still have many shortcomings in practical applications. First, they are large in size and complex in structure. PTC heating modules are usually assembled from multiple ceramic plates and metal heat sinks, occupying a lot of space and hindering the integrated layout of the vehicle's thermal management system. Second, existing stainless steel thick-film heating structures are generally heavy and have high manufacturing costs. Their processing requires the use of high-precision stainless steel substrates and multi-layer conductor sintering, which is complex and material-intensive. In addition, the heating efficiency of this type of heater is generally low and the thermal response speed is slow. PTC elements have self-limiting temperature characteristics, and the single-sided heating mode results in a long heat conduction path, a significant temperature gradient, and a limited heat exchange rate. Furthermore, since thick-film heating structures are mostly single-sided heating, the temperature distribution of the fluid is uneven when flowing through the heating channel, which can easily lead to local overheating and poor temperature uniformity, thus affecting the overall thermal stability and service life of the system. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a double-film heater core structure with compact structure, uniform heating on both sides, and high thermal efficiency.

[0005] To solve the above-mentioned technical problems, the core structure of the double-film heater of this utility model includes: a cavity located in the middle, with an inlet and an outlet respectively provided at the left and right ends of the front side of the cavity; the upper and lower surfaces of the cavity are respectively closed by an upper substrate and a lower substrate, with heat dissipation columns extending into the cavity on the upper substrate and the lower substrate; an upper thick film heating layer consisting of a first sintered low-temperature glass layer, a silver electrode conductor layer, a resistance heating layer, and a second sintered low-temperature glass layer is sequentially stacked on the upper surface of the upper substrate; a lower thick film heating layer symmetrical to the upper thick film heating layer is provided on the lower surface of the lower substrate.

[0006] The cavity is formed by die casting of ADC12 aluminum alloy.

[0007] The solder joints of the silver electrode conductor layer are equipped with a film temperature NTC for real-time detection of heating temperature and temperature control.

[0008] The heat dissipation columns on the upper and lower substrates are interwoven to form fluid channels and are arranged in an array within the cavity.

[0009] The cross-section of the heat dissipation column is teardrop-shaped, with one end smaller than the other.

[0010] Both the upper and lower substrates are forged from AL3003.

[0011] The resistive heating layer is made of ruthenium-based precious metal material.

[0012] Advantages of this utility model: (1) By setting upper and lower substrates with water droplet-shaped heat dissipation columns on the upper and lower sides of the die casting cavity respectively, and arranging symmetrical thick film heating layers on their outer surfaces, the simultaneous heating of both sides is achieved; when the fluid flows along the water droplet-shaped flow channel in the cavity, it can be subjected to heat radiation and convection heat transfer from both the upper and lower sides at the same time, which greatly improves the heat transfer efficiency and thermal response speed and reduces the temperature gradient. (2) The upper and lower base plates are connected to the die-cast cavity formed by die casting of ADC12 aluminum alloy by friction stir welding. The weld has high strength and good air tightness, which can effectively avoid the problem of coolant leakage, improve the mechanical reliability and service life of the whole machine, and the overall structure is compact, which greatly reduces the weight compared with traditional stainless steel thick film heaters. (3) Ruthenium-based noble metal resistive heating layers are arranged in both the upper and lower thick film heating layers, which provide uniform heating and rapid response; at the same time, film temperature sensors are welded at the conductor silver layer solder joints, and the sensor temperature is read in real time after power-on, protecting the core from dry burning and improving temperature uniformity and safety. Attached Figure Description

[0013] Figure 1 This is an exploded view of the core structure of the double-film heater of this utility model; Figure 2 This is a schematic diagram of the upper substrate in the core structure of the double-film heater of this utility model; Figure 3 This is an assembly diagram of the cavity and the upper substrate in the core structure of the double-film heater of this utility model. Detailed Implementation

[0014] The structure of the double-film heater core of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0015] The core structure of the dual-film heater includes a central cavity 1, which is die-cast from ADC12 aluminum alloy. The front left and right ends of the cavity 1 are respectively equipped with an inlet and an outlet. Figure 3 As shown, the left end is the water inlet and the right end is the water outlet, with the water flowing from left to right. The upper and lower surfaces of the cavity 1 are respectively closed by an upper substrate 2 and a lower substrate, and heat dissipation columns extending into the cavity 1 are provided on the upper and lower substrates. On the upper surface of the upper substrate 2, an upper thick film heating layer is formed by stacking a first sintered low-temperature glass layer 3, a silver electrode conductor layer 4, a resistance heating layer 5 made of ruthenium-based noble metal material, and a second sintered low-temperature glass layer 6. The lower surface of the lower substrate is provided with a lower thick film heating layer that is symmetrical to the upper thick film heating layer. The cross-section of the heat dissipation column is teardrop-shaped with one end smaller than the other. The heat dissipation columns on the upper and lower substrates are interlaced to form fluid channels and are arranged in an array in the cavity. The upper substrate 2 and the lower substrate are both forged from AL3003. After being fitted together, they form a teardrop-shaped flow channel, which can fully transfer heat and improve heating efficiency. After stirring and friction, a teardrop-shaped water tank is formed. A film temperature NTC8 is provided at the solder joint of the silver electrode conductor layer 4 for real-time detection of heating temperature and temperature control.

[0016] Low-temperature glass is screen-printed on the upper surface of the water tank, and then sintered at 450°C to form an insulating layer, i.e., the first sintered low-temperature glass layer. A silver electrode conductor layer is screen-printed on the insulating layer and then sintered to form the silver electrode conductor layer. A resistance heating layer made of ruthenium-based precious metal is screen-printed again and then sintered to form the resistance heating layer. Low-temperature glass is screen-printed again and sintered to form the second sintered low-temperature glass layer. Finally, an upper thick-film heating layer is formed. The lower surface of the lower substrate is screen-printed and sintered repeatedly according to the upper surface to form the lower thick-film heating layer, so that heating films are sintered simultaneously on both the upper and lower surfaces.

Claims

1. A double-film heater core structure, characterized in that, include: The cavity (1) located in the middle has an inlet and an outlet at the left and right ends of the front side of the cavity (1), respectively. The upper and lower surfaces of the cavity (1) are closed by an upper substrate (2) and a lower substrate, respectively. The upper substrate and the lower substrate are provided with heat dissipation columns extending into the cavity (1). An upper thick film heating layer consisting of a first sintered low temperature glass layer (3), a silver electrode conductor layer (4), a resistance heating layer (5), and a second sintered low temperature glass layer (6) is stacked sequentially on the upper surface of the upper substrate (2). A lower thick film heating layer symmetrical to the upper thick film heating layer is provided on the lower surface of the lower substrate.

2. The double-film heater core structure according to claim 1, characterized in that: The cavity (1) is formed by die casting of ADC12 aluminum alloy.

3. The double-film heater core structure according to claim 1, characterized in that: The silver electrode conductor layer (4) is provided with a film temperature NTC (8) at the solder joint for real-time detection of heating temperature and temperature control.

4. The double-film heater core structure according to claim 1, characterized in that: The heat dissipation columns on the upper and lower substrates are interwoven to form fluid channels and are arranged in an array within the cavity.

5. The double-film heater core structure according to claim 1, characterized in that: The cross-section of the heat dissipation column is teardrop-shaped, with one end smaller than the other.

6. The double-film heater core structure according to claim 1, characterized in that: Both the upper substrate (2) and the lower substrate are forged from AL3003.

7. The double-film heater core structure according to claim 1, characterized in that: The resistive heating layer (5) is made of ruthenium-based precious metal material.

Images