Positive temperature coefficient (PTC) electric heater for electric automobile air-conditioning system

A technology for electric heaters and electric vehicles, applied in ohmic resistance heating parts, heating elements, heating/cooling equipment, etc., can solve the problems of inability to meet environmental protection requirements, complicated processes, and the adhesive is not easy to disassemble and repair. Overall stability and heat dissipation capacity, good mechanical strength, the effect of avoiding excessive temperature burnout

Active Publication Date: 2012-08-22

河北宏业永盛汽车加热器股份有限公司

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AI-Extracted Technical Summary

Problems solved by technology

Changes in the power system have led to the heating methods of traditional fuel vehicles: including the use of engine waste heat and setting independent fuel heat sources, will no longer be suitable for electric vehicles

Existing PTC electric heaters usually connect the PTC h...

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Method used

Described frame body 7 is made by heat-resistant engineering plastics, and profile is the box structure that electric vehicle size is suitable for, and is made up of two frame butt joints that can be fastened mutually, and there are many designs in the both sides of frame body 7 The uniformly arranged spokes provide tension and improve the mechanical strength of the frame.

PTC heating plate 10 is made up of two sheets of aluminum or stainless steel electrode sheet and PTC heating chip, and the periphery of two sheet electrode sheets is made the frame that can be fastened with silicon rubber, is isolated with silicon rubber bar in silicon rubber frame inner space 2 to 12 equal parts, put the PTC heating chip into the corresponding isolation area, and then fasten the two electrode sheets to form a heating plate. The radiating fins 1...

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Abstract

The invention discloses a positive temperature coefficient (PTC) electric heater for an electric automobile air-conditioning system. The periphery of an electrode plate is provided with a silicon rubber fastened frame, wherein the inner space of the frame is equally divided by a silicon rubber strip and is isolated; a PTC heating chip is positioned in each isolated area; frames of two electrode plates are fastened; a plurality of groups of PTC heating plates and radiating fins are alternately arranged in the frame; the PTC heating plates and the radiating fins are electrically insulated through a heat-conducting silicon rubber protective film; a base plate is arranged inside the frame; a damping spring leaf is arranged between the frame and the base plate; a controller is positioned in the shell; a vent hole is formed on the shell; one end of a terminal board is electrically connected with the electrode plates on the PTC heating plates, the other end of the terminal board is connected with the controller through an electrode circuit board, and the terminal board is arranged on the frame; and one end of a plug connector penetrates through the shell so as to be connected with the controller, and the controller is used for controlling the power of the electric heater. The PTC electric heater disclosed by the invention has the characteristics of reliable mechanical structure, durable and environmentally-friendly materials, high temperature rise speed, high radiating capacity and safe and stable operation.

Application Domain

Air-treating devicesHeater elements +2

Technology Topic

Environmental resistanceEnvironmentally friendly +6

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Experimental program(1)

Example Embodiment

[0015] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0016] Such as figure 1 As shown, the PTC electric heater of the present invention includes a heater frame 7, a PTC heating plate 10, heat dissipation fins 11, a connector 1 and a controller;

[0017] The frame body 7 is made of heat-resistant engineering plastics, and has a frame structure suitable for the size of an electric vehicle. It is composed of two frames that can be fastened to each other, and a plurality of frames are arranged evenly on both sides of the frame body 7 The spokes provide tension and improve the mechanical strength of the frame.

[0018] The PTC heating plate 10 is composed of two aluminum or stainless steel electrode plates and a PTC heating chip. The periphery of the two electrode plates is made of silicone rubber to make a snap-on frame, and the internal space of the silicone rubber frame is separated into 2-12 by a silicone rubber strip. Divide equally, put the PTC heating chip into the corresponding isolation area, and then buckle the two electrode sheets to form a heating plate. The radiating fins 11 are made of copper, aluminum or their alloys, and the shape of the radiating holes of the radiating fins is a water drop corrugated shape, which has the characteristics of simple manufacture and high heat dissipation capacity.

[0019] Multiple sets of PTC heating plates 10 and radiating fins 11 are alternately arranged in the frame body 7. The PTC heating plates 10 are completely electrically insulated from the radiating fins by a thermally conductive insulating material and thermally conductive silica gel protective film. A backing plate 9 is provided on the inner side of the frame body 7, and a shock-absorbing spring sheet 12 is provided between the frame body 7 and the backing plate 9 to buffer the vibration between the backing plate 9 and the frame body 7 to realize PTC Stable connection between the heating plate and the radiating fins.

[0020] The contact part of the spokes on the frame 7 and the heat dissipation fin 11 is designed with trapezoidal protrusions, which realizes the auxiliary limiting function for the heat dissipation fin 11.

[0021] Such as figure 2 As shown, the controller 3 is located in the housing 2. The upper and lower sides of the housing 2 are provided with vents 13 through which air can be introduced. The vents realize the circulation of air around the circuit board in the controller to achieve the The purpose of timely and rapid heat dissipation during work. It can also be connected from the controller to the outlet of the exhaust fan through a specially designed ventilation duct, or the ventilation duct can be replaced by a high-temperature resistant air duct to realize the circulation of air in the housing.

[0022] The end row 6 is installed on the frame 7, one end of the end row 6 is electrically connected to the PTC heating plate 10, and the other end is connected to the controller 3 through the electrode circuit board 5, and fixed with the fixing screw 4, the end row 6, the electrode circuit board 5 and the controller 3 are both located in the housing 2, and one end of the connector 1 passes through the housing 2 and is connected to the controller 3. The controller 3 uses a common pulse width modulation (PWM) method to control the power of the electric heater. The electric heater of this structure can realize heat insulation between the heat generating part and the control part.

[0023] In order to improve the heat dissipation efficiency, water drop corrugated fins made of copper, aluminum or their alloys are used to dissipate heat. For the convenience of production, this component can also be replaced by sine wave or rectangular radiating fins, but it is not as good as the drop corrugated heat dissipation effect.

[0024] In the present invention, the frame can also be replaced by a steel sheet compact structure design, such as Figure 5 As shown, a high-elastic alloy or an elastic steel sheet 15 with a specific elastic force (normally curved, and the curvature is adjusted between 0.2 and 2 according to the elasticity of the steel sheet) is interconnected with the side frame 16 through the upper two connecting bearings 17 The heating plate and the radiating fins are arranged neatly, the backing plate and the spring plate are placed on the outside, fixed into the side frame groove, and then the elastic steel plate 15 is used to compress it to fix the spring plate and the backing plate, and then the lower side is designed with The end row 6 of the buckle structure adapted to the steel sheet is connected to it, and is fixed at the screw hole 14 with a fixing screw.

[0025] Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present invention, All should be included in the protection scope of the present invention.

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Description & Claims & Application Information

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ActiveCN104306020AImprove maintainabilityImprove detachabilityInfrasonic diagnosticsSonic diagnosticsPhysicsEngineering

Owner:EDAN INSTR

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Positive temperature coefficient (PTC) electric heater for electric automobile air-conditioning system

AI-Extracted Technical Summary

Problems solved by technology

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Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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