Liquid heater with high heat utilization rate

Abstract

The utility model discloses a liquid heater with high heat utilization rate, which comprises a heating container, a liquid inlet pipe, a liquid outlet pipe and at least two groups of heating components, the liquid inlet pipe and the liquid outlet pipe are respectively arranged on two sides of the heating container, and the heating components are arranged in the heating container side by side along the direction from the liquid inlet pipe to the liquid outlet pipe at intervals. Each heating assembly comprises a resistance wire, an insulating layer and a heating layer protection plate, the resistance wires are arranged in the insulating layers, the heating layer protection plates are fixedly connected to the two sides of the insulating layers respectively, and a cavity between the heating assemblies and a cavity between the heating assemblies and the inner wall of the heating container are liquid heating cavities. According to the liquid heater, heat of the heating assembly can be fully utilized, the heating area is increased, energy waste is reduced, and the liquid heating efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the field of electric vehicle thermal management systems, in particular to a liquid heater with high heat utilization rate for heating a battery pack of an electric vehicle. Background Art

[0002] The liquid heater in the electric vehicle thermal management system is a key component used to control the temperature of the electric vehicle to ensure optimal performance and efficiency. After the coolant is heated by the liquid heater, it is usually used to heat components such as the battery pack, motor, inverter, etc. In cold weather, the temperature of the battery and other key components can affect the battery performance and the efficiency of the entire vehicle. The liquid heater can help increase the operating temperature of the battery, reduce energy loss during cold start, and avoid the impact of low temperature on battery life. In short, the liquid heater plays an important role in the thermal management system of electric vehicles to ensure that the vehicle can perform well in different climate conditions.

[0003] The structure of the liquid heater in the existing electric vehicle is shown in patents CN112524807A, CN109506358B, and CN112648740A. The thick film process is used to print the covering insulating layer (composed of ceramics with good thermal conductivity, low-melting glass and other materials) on the surface of the resistive heating element (such as the resistance wire) to achieve the encapsulation of the resistive heating element. At the same time, the resistive heating element is adhered to the heating plate by the method of physical vapor deposition (PVD) or chemical vapor deposition (CVD) insulating layer. Two metal heating plates and the heater shell form two closed heating chambers, and the cavity between the two heating plates is sealed. When working, the liquid to be heated flows into the heater inlet and passes through the two heating chambers in turn. After being heated by the two heating plates, it flows out from the heater outlet to complete the heating.

[0004] The disadvantage of this structure of the liquid heater is that the arrangement of the two heating plates is unreasonable. A sealed cavity is set between the two heating plates, but this sealed cavity cannot be used for liquid heating, which wastes the heat on the back of the heating plate, making the heat utilization rate of the liquid heater relatively low, so it needs to be improved. Utility Model Content

[0005] The utility model aims to provide a liquid heater with high heat utilization rate which can solve the problem of low heat utilization rate existing in the liquid heater mentioned in the background technology.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a liquid heater with high heat utilization rate, comprising a heating container, a liquid inlet pipe, a liquid outlet pipe and at least two groups of heating components, the liquid inlet pipe and the liquid outlet pipe are respectively arranged on both sides of the heating container, the heating components are arranged side by side in the heating container with a spacing along the direction from the liquid inlet pipe to the liquid outlet pipe, the heating components include a resistance wire, an insulating layer and a heating layer protective plate, the resistance wire is arranged in the insulating layer, the heating layer protective plates are respectively fixedly connected to both sides of the insulating layer, the cavity between the heating components and the cavity between the heating components and the inner wall of the heating container are liquid heating chambers.

[0007] In the above scheme, the top and bottom of the heating container are respectively provided with wiring ports, and the wiring electrodes of the resistance wires of each group of heating components respectively extend through the wiring ports to the outside of the heating container.

[0008] In the above scheme, heating fins are distributed in the liquid heating chamber, and the heating fins are fixedly connected to the heating layer protection plate of the heating component.

[0009] In the above scheme, the liquid inlet pipe and the liquid outlet pipe both include a rectangular tube body, a liquid channel is provided on the connecting surface between the rectangular tube body and the heating container, the liquid channel is connected to the liquid heating chamber in the heating container, a liquid inlet is provided at one end of the liquid inlet pipe, and a liquid outlet is provided at one end of the liquid outlet pipe.

[0010] The utility model has positive effects: in the liquid heater of the utility model, the resistance wire of the heating component is arranged in the insulating layer, and the heating layer protection plates are arranged on both sides of the insulating layer to further isolate the insulating layer from the liquid heating chamber, and multiple groups of heating components are arranged in the same direction and at intervals, the cavities between the heating components and the cavities between the heating components and the inner walls of the heating container can be used as liquid heating chambers, and these cavities can utilize the heat on both sides of the heating components, so the heating efficiency is higher and the energy waste can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic structural diagram of the liquid heater of the utility model.

[0012] Figure 2 for Figure 1 AA section view structural diagram.

[0013] Figure 3 for Figure 1 BB section structure schematic diagram.

[0014] Figure 4 for Figure 1 Schematic diagram of the CC section structure.

[0015] Figure 5It is a schematic diagram of the three-dimensional structure of the liquid heater of the utility model.

[0016] Figure 6 It is a schematic diagram of the lower structure of the liquid heater of the utility model.

[0017] Figure 7 It is a schematic diagram of the structure of the liquid inlet pipe.

[0018] Figure 8 This is a cloud diagram of the temperature distribution of the liquid in a traditional heater.

[0019] Fig. 9 This is a temperature distribution cloud diagram of the liquid in the heater of the present invention.

[0020] The reference numerals in the figure are: heating container 1, wiring port 11, liquid heating chamber 12, liquid inlet pipe 2, liquid inlet 21, liquid outlet pipe 3, liquid outlet 31, heating component 4, resistance wire 41, insulating layer 42, heating layer protection plate 43, wiring electrode 44, heating fin 45. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is described clearly and completely below through embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-7 A liquid heater with high heat utilization rate shown includes a heating container 1, a liquid inlet pipe 2, a liquid outlet pipe 3 and at least two groups of heating components 4.

[0023] The heating container 1 is a sealed container made of heat-insulating material, and its shape can be set to be rectangular, and its side panels can be fixedly connected in a detachable manner. A cavity is provided inside the heating container 1, and the heating assembly 4 is arranged in the cavity. A liquid inlet port is provided on the left side of the heating container 1, and the liquid channel of the liquid inlet pipe 2 is connected to the liquid inlet port on the heating container 1 accordingly. A liquid outlet port is provided on the right side of the heating container 1, and the liquid channel of the liquid outlet pipe 3 is connected to the liquid outlet port on the heating container 1 accordingly.

[0024] The heating component 4 includes a resistance wire 41, an insulating layer 42 and a heating layer protective plate 43. The resistance wire 41 is arranged in the insulating layer 42. The heating layer protective plate 43 is fixedly connected to both sides of the insulating layer 42. The cavity between the heating components 4 and the cavity between the heating components 4 and the inner wall of the heating container 1 are the liquid heating cavity 12.

[0025] The number of heating components 4 can be set as needed, and at least two groups of heating components 4 need to be set.

[0026] The resistance wire 41 is arranged in a plane and transversely in the insulating layer 42. The insulating layer 42 is made of ceramic, low-melting glass and other materials with good thermal conductivity. The resistance wire 41 is completely encapsulated in the insulating layer 42. Figure 5 and 6 As shown, wiring ports 11 are respectively provided at the top and the bottom of the heating container 1 , and the wiring electrodes 44 of the resistance wires 41 of each group of heating components 4 respectively pass through the wiring ports 11 and extend to the outside of the heating container 1 .

[0027] The heating layer protection plate 43 is made of a material with good thermal conductivity, such as a metal plate.

[0028] In order to enhance the thermal conductivity, heating fins 45 may be provided on the heating layer protection plate 43. The heating fins 45 are provided in the liquid heating chamber 12. By heating the liquid with the heating fins 45, the heat exchange area may be increased, thereby further improving the heating efficiency.

[0029] The shape of the heating fin 45 can be selected as required, for example, Figure 3 and 4 The longitudinal cross section of the heating fin shown in FIG. 1 is trapezoidal.

[0030] The liquid inlet pipe 2 and the liquid outlet pipe 3 both include a rectangular tube body, and a liquid channel is provided on the connecting surface between the rectangular tube body and the heating container 1. The liquid channel is connected to the liquid heating chamber 12 in the heating container 1. A liquid inlet 21 is provided at one end of the liquid inlet pipe 2, and a liquid outlet 31 is provided at one end of the liquid outlet pipe 3.

[0031] When the liquid heater of the utility model is in use, liquid enters the liquid inlet pipe from the liquid inlet port on the liquid inlet pipe, enters the liquid heating chamber inside the heating container through the liquid channel and the liquid inlet port on the heating container, the electrodes of the resistance wire are connected to the external power supply, the resistance wire generates heat after being energized, the heat is transferred to the heating layer protection plate through the insulating layer, the heat is further transferred to the heating fins in each liquid heating chamber, the heating layer protection plate and the heating fins are used to heat the liquid, the heated liquid enters the liquid outlet pipe through the liquid outlet port on the right side of the heating container, and is then discharged through the liquid outlet.

[0032] In the heating container of the present invention, a sealed cavity is no longer provided between the heating components in the heating container, which can make the thermal efficiency higher and reduce the waste of energy. The internal cavity of the heating container except the space occupied by the heating components can be completely used for heating the liquid, which can significantly improve the heating efficiency of the liquid, improve the heating efficiency, and increase the temperature of the output liquid.

[0033] In order to verify the improvement of heat exchange efficiency of the utility model, a comparative experiment was conducted between the traditional heater using a single-sided heating layer and the heater structure of the utility model using a double-sided heating layer. The flow rate of the liquid to be heated entering the heater was set to 15L / min, and it flowed in from the left liquid inlet pipe and out from the right liquid outlet pipe. The original temperature of the liquid to be heated was 25℃, and the average surface temperature of the resistance wire was 200℃. Through the fluid-solid thermal coupling finite element analysis, the analysis results are as follows: Figure 8 and 9 As shown, Figure 8 This is the temperature distribution cloud diagram of the liquid in the traditional heater. Fig. 9 This is a temperature distribution cloud diagram of the liquid in the heater of the utility model. By comparing the temperature cloud diagrams, it can be seen that the temperature of the liquid on the side of the liquid outlet pipe of the heater of the utility model is significantly higher than the liquid temperature at the same position in the traditional heater. The average temperature of the liquid in the right liquid outlet area was measured by a thermometer. The average temperature of the liquid heated by the traditional heater was 37.2°C, and the average temperature of the liquid heated by the heater of the utility model was 43.8°C, which proves that the heater of the utility model has a higher heat utilization rate and a greater heat exchange rate.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid heater with high heat utilization rate, characterized in that: It includes a heating container, a liquid inlet pipe, a liquid outlet pipe and at least two groups of heating components. The liquid inlet pipe and the liquid outlet pipe are respectively arranged on both sides of the heating container. The heating components are arranged side by side in the heating container with a spacing along the direction from the liquid inlet pipe to the liquid outlet pipe. The heating components include a resistance wire, an insulating layer and a heating layer protection plate. The resistance wire is arranged in the insulating layer. The heating layer protection plate is respectively fixedly connected to both sides of the insulating layer. The cavity between the heating components and the cavity between the heating components and the inner wall of the heating container are liquid heating chambers.

2. The liquid heater with high heat utilization rate according to claim 1, characterized in that: The top and bottom of the heating container are respectively provided with wiring ports, and the wiring electrodes of the resistance wires of each group of heating components respectively pass through the wiring ports and extend to the outside of the heating container.

3. The liquid heater with high heat utilization rate according to claim 1, characterized in that: Heating fins are distributed in the liquid heating cavity, and the heating fins are fixedly connected to the heating layer protection plate of the heating component.

4. The liquid heater with high heat utilization rate according to claim 1, characterized in that: The liquid inlet pipe and the liquid outlet pipe both include a rectangular tube body, a liquid channel is provided on the connecting surface between the rectangular tube body and the heating container, the liquid channel is connected to the liquid heating chamber in the heating container, a liquid inlet is provided at one end of the liquid inlet pipe, and a liquid outlet is provided at one end of the liquid outlet pipe.

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