CN207678023U - A PTC heating device - Google Patents

Abstract

The utility model discloses a PTC heating device, which comprises: a PTC heating component, and the PTC heating component includes: a PTC heating sheet, a waste sheet, an electrode, an insulating layer and an aluminum tube; two electrodes are arranged close to the upper and lower surfaces of the PTC heating sheet , the electrode is used to heat the PTC heating sheet, so that the PTC heating sheet generates heat; the PTC heating sheet includes multiple pieces, and the waste sheet is located between the multiple PTC heating sheets to isolate multiple PTC heating sheets; the insulating layer is located between the electrode and the aluminum Inside the tube, the insulating layer wraps the electrode to insulate the electrode from the external medium, and the insulating layer has good thermal conductivity; the aluminum tube wraps the insulating layer to encapsulate the insulated electrode. The PTC heating device provided by the utility model is safe and reliable, has simple structure, high heating efficiency and good insulation effect, and can be directly put into the water tank of an electric vehicle or used as an air heating device.

Description

A PTC heating device

technical field

The utility model relates to the technical field of positive temperature coefficient thermistor (Positive Temperature Coefficient, PTC) heating, more specifically, relates to a PTC heating device.

Background technique

New energy and energy saving and emission reduction technologies are emerging technologies that are being vigorously developed in the transportation industry. The use of new energy technology to achieve the purpose of energy saving and emission reduction has become the development trend of vehicle technology in the world today. At present, electric vehicles have been relatively maturely applied in domestic and foreign markets, and hybrid electric vehicles, pure electric vehicles and hybrid light rail trains have rapidly developed into emerging industries in Europe, Japan, China and other countries and regions.

The heating of traditional fuel vehicles mainly uses the waste heat of the engine or sets up an independent fuel heat source, while new energy vehicles mainly rely on batteries to provide power. Due to the limited heat generation of the battery, and in order to ensure its normal operation in a low temperature environment, an external heat source is even required. Based on the above considerations, current electric vehicles mostly use heating devices that use PTC as a heat source to heat the battery and the body.

PTC ceramic heating element has the following characteristics: no radiation, no pollution, no electromagnetic radiation damage to the body; rapid temperature rise, self-control temperature in case of fan failure, long service life; wide voltage range, can be between 12V-600V according to needs Design; the design is convenient, can be designed from low power to high power, and the shape can also be designed according to requirements; no combustion, no fire, safe and reliable. It is precisely because PTC has the above characteristics that its application is quite extensive. In addition to being used in electric vehicles, many heaters currently on the market use it as a core heating component, such as household air conditioners, heaters, and bathroom heaters.

Most of the PTC heating components used in home appliances on the market work under 220V AC voltage, while the working voltage of electric vehicles is generally between 300V-600V, so the PTC heating devices used in electric vehicles need to have better stability and safety .

The operating environment of electric vehicles is more complicated than that of ordinary household appliances, and the requirements for the stability of the device structure are higher. In the Chinese utility model patent specification CN203537577U, a PTC heating device for electric vehicles is disclosed, and its components are bonded with silica gel. This device has serious defects, that is, the silica gel will inevitably age after a long time, and in long-term use , due to the inevitable vibration, the stability of the whole device structure is difficult to guarantee.

Since the electric vehicle works in a purely electric way, the PTC heating device needs to have a high working efficiency in order not to lose too much electric energy. And because the operating voltage of the heating device is high, and the heating assembly has a certain service life, this requires that the replacement of the heating assembly should be as convenient as possible. Chinese patent specification CN104869674A discloses a PTC plumbing heating pipe, which uses ordinary ceramics as the insulating material inside. Obviously, this design is not conducive to heat transfer, and the heating efficiency is low.

At present, most PTC heaters used in the field of household appliances use polyimide as the insulating material, which cannot meet the insulation performance requirements of electric vehicle heating devices.

Utility model content

Aiming at the defects of the prior art, the purpose of this utility model is to solve the problem that the components of the PTC heating device for electric vehicles are bonded with silica gel, which is easy to age, and the stability of the entire device structure is poor, the heating efficiency is low, and the insulation performance is poor. technical problem.

In order to achieve the above purpose, the utility model provides a PTC heating device, which includes: a PTC heating component, and the PTC heating component includes: a PTC heating sheet, a waste sheet, an electrode, an insulating layer and an aluminum tube;

Two electrodes are closely attached to the upper and lower surfaces of the PTC heating sheet, and the electrodes are used to heat the PTC heating sheet to make the PTC heating sheet generate heat; the PTC heating sheet includes a plurality of waste sheets Located between a plurality of PTC heating sheets, used to isolate the plurality of PTC heating sheets; the insulating layer is located inside the electrode and the aluminum tube, and the insulating layer wraps the electrode to insulate the electrode from the external medium , the thermal conductivity of the insulating layer is good; the aluminum tube wraps the insulating layer and is used to package the insulated electrodes.

Optionally, the PTC heating device also includes: a heat dissipation assembly, a flange and a silicon base;

The heat dissipation component is nested outside the PTC heating component, and is used to expand the heat dissipation area of the heating element and improve the heat exchange efficiency between the PTC heating component and the external medium, and the external medium can be water or air;

The flange is used to be fixed with the aluminum tube by brazing technology, so that the PTC heating device is stable and reliable;

The silicon base is used to be provided with electrode slots for fixing the electrodes.

Optionally, one end of the aluminum tube is closed and the other end is open. The closed end can be put into water, and has good insulation, heat dissipation and corrosion resistance. The good insulation allows the PTC heating device to be directly inserted into water, and has extremely High heating efficiency.

Optionally, the waste sheet is an electrodeless PTC material, which mainly plays the role of isolating the PTC heating sheet.

Optionally, the material of the insulating layer is mica, which has good insulation and thermal conductivity and high temperature resistance, has certain ductility and workability, and has good physical and chemical properties in sharp temperature changes or acid-base environments. performance.

Optionally, the heat dissipation component and the PTC heating component are fixed by mechanical pressure and brazing technology, which has strong stability.

Optionally, the electrode material is aluminum sheet, stainless steel sheet or copper sheet, which is convenient for installation and replacement.

Optionally, the PTC heating device further includes: a water drain, the water drain is located on the heat dissipation component, and is used to ensure the flow of water along the direction of the PTC heating component.

Optionally, the PTC heating components are divided into two groups to improve heating efficiency and are suitable for large-volume water tanks.

Optionally, the aluminum tube has a U-shaped structure, and the bottom of the U-shaped structure is mainly used for fixing, which is suitable for long-term severe vibration of the water-heating container, and the bottom of the U-shaped structure also acts as a heat sink.

Generally speaking, compared with the prior art, the above technical solution conceived by the utility model has the following beneficial effects:

The PTC heating device provided by the utility model is safe and reliable, has simple structure, high heating efficiency and good insulation effect, and can be directly put into the water tank of an electric vehicle or used as an air heating device.

The PTC heating device provided by the utility model has a simple structure, and the PTC heating component and the cooling component can be combined at will, so it can be used as an air heating device or a water heating device only by properly assembling the device.

Description of drawings

Fig. 1 is the structural representation of the PTC heating device provided by the utility model;

Fig. 2 is the structural representation of the embodiment case 1 provided by the utility model;

Fig. 3 is the structural representation of the embodiment case 2 that the utility model provides;

Fig. 4 is a schematic structural diagram of Embodiment 3 provided by the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

The purpose of the utility model is to design a PTC heating device with stable performance, high heating efficiency and simple structure. FIG. 1 is a schematic structural diagram of a PTC heating device provided by the present invention, as shown in FIG. 1 , including a PTC heating component, a cooling component 7 and a flange 1 . The PTC heating component includes a PTC heating sheet 2, a waste sheet 3, an electrode 4, an insulating layer 5, a silicon base 8, an aluminum tube 6, and the like.

The PTC heating component includes a PTC heating sheet 2, a waste sheet 3, two electrodes 4 and an aluminum tube 6 closely attached to the upper and lower surfaces of the heating sheet. An insulating layer 5 with good thermal conductivity is placed inside the electrode 4 and the aluminum tube 6, and a silicon base 8 is placed at the bottom of the aluminum tube 6 for fixing the electrodes.

The heat dissipation component 7 is nested outside the PTC heating component, and is used to expand the heat dissipation area of the heating element and improve the heat exchange efficiency between the PTC heating component and the external medium. The external medium can be water or air. That is to say, the PTC heating device can be used as a wind heating device or a water heating device.

Because the physical and chemical properties of the insulating layer 5 are good, it has waterproof, acid and alkali resistance, and weathering resistance, and has high-quality characteristics such as high dielectric strength, constant dielectric constant, and high thermal stability. In this structure, the insulation properties of the insulating layer wrapped outside the electrodes electrically isolate the internal electrodes from the outer surface of the device, ensuring the insulation of the entire device.

Among them, the flange 1 and the aluminum tube 6 are fixed by brazing technology, which is stable and reliable.

Among them, the aluminum tube 6 is closed at one end and open at the other end, the closed end can be put into water, and has good insulation, heat dissipation and corrosion resistance. The good insulation allows the unit to be inserted directly into the water, so it has a very high heating efficiency.

Wherein, the material of the insulating layer 5 can be mica, which has good insulation and thermal conductivity and high temperature resistance, has certain ductility and processability, and has good physical and chemical properties in sharp temperature changes or acid-base environments. Long service life and high reliability.

Among them, the silica gel base 8 has good thermal stability, stable chemical properties, and high mechanical strength. Electrode slots are arranged on the silicone base 8 for fixing the electrodes. The cooling fins on the outside of the device greatly expand the heat dissipation area of the heating element and improve the heat exchange efficiency between the heating element and the water body.

Wherein, the electrode 4 is made of aluminum sheet, stainless steel sheet or copper sheet. Easy to install and replace.

Wherein, the heat dissipation component 7 is an aluminum sheet, and the heat dissipation fin and the heating component are fixed by mechanical pressure and brazing technology, which has strong stability.

The utility model is safe and reliable, has a simple and stable flange structure, is easy to replace, and has good insulation performance. Heating efficiency.

Optionally, mica and silicone bases, both of which have good thermal conductivity and mechanical strength.

The aluminum tube adopts a flat structure, one end is closed and the other end is open, which increases the contact area between the device and the liquid. The heat dissipation component and the heating component are fixed by mechanical pressure and brazing technology, and the whole device can be directly put into the water tank. However, most general-purpose PTC heaters design the heating element and the water flow part as two completely separate devices, relying on metal to transfer heat. Therefore, compared with the general PTC heating device, the device has the remarkable feature of high heating efficiency.

In addition, due to the simple structure of the device, the PTC heating components and cooling components can be combined at will, so it can be used as a wind heating device or a water heating device only by properly assembling the device.

Implementation Case 1

As shown in Figure 2, the utility model is a PTC water heating device for electric vehicles with good insulation, which is characterized in that it includes a PTC heating component, a heat dissipation component nested outside the PTC heating component, and a flange device fixed end 100. The PTC heating component includes a PTC heating sheet, a waste sheet, two electrodes 400 and 401 closely attached to the upper and lower surfaces of the heating sheet, an aluminum tube, and the like. Among them, the waste sheet is an electrodeless PTC material, which mainly plays the role of isolating the heating sheet, and a mica layer with good thermal conductivity is placed inside the electrode and the aluminum tube. There is a silicon base 8 at the bottom of the aluminum tube, which mainly plays the role of insulating and fixing the electrodes.

Furthermore, the heat dissipation component and the PTC heating component are fixed by mechanical pressure and brazing technology, and the structure of the device has strong stability.

Further, the heat dissipation component 701 is used to control the interval between components, and 702 is a drain port, which ensures the flow of water along the direction of the PTC heating element.

Further, the flange fixed end 100 is connected to the aluminum tube by brazing, which can enhance the stability of the connection between the two and the sealing performance of the device, and 101 is a screw hole for fixing the device.

Implementation Case 2

As shown in Figure 3, this implementation case is substantially the same as Case 1, the difference is that in this implementation case, there are two sets of PTC heating components 610, and the heating efficiency is higher. At the same time, due to its relatively large volume, it is suitable for large water tanks.

Implementation Case 3

As shown in Figure 4, this implementation case is basically the same as Case 2, the difference is that the aluminum tube 620 in this implementation case can be a U-shaped structure, and the U-shaped bottom is mainly used for fixing, which is suitable for the long-term severe vibration environment of the water-heating container , and the U-shaped bottom acts as a heat sink.

The above schemes are for reference only. Since the device has a simple structure and is easy to assemble, in principle, the user can customize the scheme according to the specific shape of the water container, which is also one of the advantages of the device.

The utility model provides a PTC heating device, which comprises a PTC heating component, a heat dissipation component nested outside the component, a flange and the like. The overall appearance of the PTC heating component is a tubular structure, which includes PTC heating sheet, waste sheet, electrode, insulating layer and aluminum tube from the inside to the outside. The heating chips are separated from each other by waste chips without electrodes. A silicon base is placed at the bottom of the aluminum tube to fix the electrodes. The utility model is safe and reliable, has simple structure, high heating efficiency and good insulation effect, and can be directly put into the water tank of an electric vehicle or used as a wind heating device.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (10)

1. A PTC heating device, characterized in that it comprises: a PTC heating assembly, and the PTC heating assembly includes: a PTC heating sheet, a waste sheet, an electrode, an insulating layer and an aluminum tube; Two electrodes are arranged close to the upper and lower surfaces of the PTC heating sheet, and the electrodes are used to heat the PTC heating sheet, so that the PTC heating sheet generates heat; The PTC heating sheets include a plurality, and the waste sheet is located between the plurality of PTC heating sheets for isolating the plurality of PTC heating sheets; The insulating layer is located inside the electrode and the aluminum tube, and the insulating layer wraps the electrode to insulate the electrode from the external medium; The aluminum tube wraps the insulating layer for encapsulating the insulated electrodes. 2. The PTC heating device according to claim 1, further comprising: a heat dissipation assembly, a flange and a silicon base; The heat dissipation component is nested outside the PTC heating component, and is used to expand the heat dissipation area of the heating element and improve the heat exchange efficiency between the PTC heating component and the external medium, and the external medium can be water or air; The flange is fixed with the aluminum tube by brazing technology, making the PTC heating device stable and reliable; Electrode slots are arranged on the silicon base for fixing the electrodes. 3. The PTC heating device according to claim 2, wherein one end of the aluminum tube is closed and the other end is open, and the closed end can be put into water. 4. The PTC heating device according to claim 3, characterized in that, the waste sheet is an electrodeless PTC material. 5. The PTC heating device according to claim 1, characterized in that, the material of the insulating layer is mica. 6. The PTC heating device according to claim 2, characterized in that, the heat dissipation component is fixed to the PTC heating component. 7. The PTC heating device according to claim 1, wherein the electrode material is aluminum sheet, stainless steel sheet or copper sheet. 8 . The PTC heating device according to claim 1 , further comprising: a water drain, and the water drain is located on the heat dissipation component. 9. The PTC heating device according to claim 1, wherein there are two groups of the PTC heating components. 10. The PTC heating device according to claim 1, wherein the aluminum tube is a U-shaped structure.