CN210091843U - PTC thermistor for high voltage and assembly thereof - Google Patents

Abstract

The utility model discloses a PTC thermistor for high voltage, which comprises a PTC thermistor body and an electrode layer; the PTC thermistor body is in a polyhedron structure, the electrode layers are arranged on two opposite surfaces of the polyhedron, an angle larger than 45 degrees is formed between the plane where the electrode layers are located and the plane where the heat transfer surface of the PTC thermistor body is located, and the area ratio of the plane where the electrode layers are located to the plane where the heat transfer surface of the PTC thermistor body is located is smaller than 1: 2. The utility model discloses make heat conduction direction and current direction not on same dimension to solved under higher voltage the contradiction that the electrode spacing will be big and the heat conduction route will be short. The utility model discloses can adopt the PTC thermistor of two thick electrode intervals to improve PTC thermistor withstand voltage nature, can adopt the PTC thermistor of thinner heat conduction distance simultaneously, make the inside and surperficial difference in temperature of PTC thermistor little, be favorable to the more high-efficient performance of PTC thermistor performance.

Description

PTC thermistor for high voltage and assembly thereof

Technical Field

The utility model relates to a thermistor especially relates to a PTC thermistor and subassembly that novel electrode structure's high voltage was used, is favorable to its performance of its excellence in high voltage occasion full play, can be applied to occasions of higher voltage such as electric automobile air conditioner.

Background

PTC thermistor heaters have been widely used for heating gases, liquids, and the like. In these applications, the PTC thermistor includes: the PTC thermistor comprises a PTC thermistor body 1 and an electrode layer 2, wherein the PTC thermistor body 1 is in a polyhedral structure, and the electrode layer 2 is arranged on two opposite surfaces of a polyhedron; the electrode surface of the PTC thermistor in the prior art is the heat outward conduction surface, i.e. the current direction and the heat conduction direction are the same dimension (as shown in fig. 1), and the heat is conducted outward through the electrode surface, so as to meet the heating requirement. For this reason, the PTC thermistor used in high voltage applications must be increased in thickness in order to withstand high voltage. The higher the voltage to which the PTC thermistor composition is subjected, the greater (thicker) the thickness (in the direction of the electric strength) of the PTC thermistor composition. The PTC thermistor chip is a semiconductor ceramic based on barium titanate. The material has poor heat conduction, the heat generated inside the PTC thermistor with larger thickness is difficult to be transferred to the surface of the PTC thermistor, and then is transferred to a heated object through the electrode plate and the shell, so that the conduction path is increased due to the increase of the thickness, and the temperature difference between the inside and the surface of the PTC thermistor is also increased. The PTC thermistor has good thermistor characteristics with positive temperature coefficient, the resistance of the part is increased rapidly when the internal temperature is increased, the current of the whole loop is reduced, the heating power is limited, and the heating effect is influenced. Meanwhile, as the thickness is increased, the temperature difference inside the PTC thermistor is increased, the distribution of the electric field inside the PTC thermistor is greatly different, and local breakdown is easily caused to influence the service life of the PTC thermistor. The thicker the PTC resistor, the less sensitive it is to changes in the surrounding environment, and the less its characteristic self-temperature control properties are. Therefore, the PTC thermistors are not suitable for being applied in high-voltage occasions. With the wider application of the PTC thermistor heater, the requirements on the PTC thermistor heater are higher, and particularly the PTC thermistor heater is applied to new energy automobiles. With the increasing voltage of the power supply of the electric automobile, the voltage of the PTC thermistor heater is required to be increased, so that the application of the conventional PTC thermistor is limited.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that prior art exists, provide one kind and can effectively solve under the higher voltage PTC thermistor and subassembly that the high voltage that the electrode spacing will be big and the contradiction that the heat conduction route will be short used, realize great two electrode spacing and shorter heat conduction distance, do benefit to high voltage occasion PTC thermistor high performance.

The utility model discloses the purpose is realized through following technical scheme:

a PTC thermistor for high voltage comprises a PTC thermistor body and an electrode layer; the PTC thermistor body is in a polyhedron structure, the electrode layers are arranged on two opposite surfaces of the polyhedron, an angle larger than 45 degrees is formed between the plane of the electrode layers and the plane of the heat transfer surface of the PTC thermistor body, and the area ratio of the plane of the electrode layers 2 to the plane of the heat transfer surface of the PTC thermistor body is smaller than 1: 2.

To further achieve the object of the present invention, it is preferable that the PTC thermistor body has a hexahedral structure.

Preferably, the upper and lower planes of the hexahedral structure are heat transfer surfaces, and the left and right planes of the hexahedral structure are respectively provided with an electrode layer; or electrode layers are provided on the front and rear planes of the hexahedral structure.

Preferably, the area ratio of the plane of the electrode layer to the plane of the heat transfer surface of the PTC thermistor body is 1: 3-8.

A PTC thermistor assembly for high voltage consists of an electrode plate, a plurality of PTC thermistors, an insulating layer and a metal heat conducting cavity which are connected; the PTC thermistors are arranged in one row or a plurality of rows, the electrode layers of two adjacent PTC thermistors in one row are connected, the electrode layers outside the first and the last PTC thermistors in the plurality of PTC thermistors arranged in one row are respectively connected with an electrode plate, and the electrode plates are also connected with a connecting terminal; the periphery of one row or multirow PTC thermistor is equipped with the insulating layer, and the insulating layer sets up in the metal heat conduction cavity.

Preferably, the plurality of PTC thermistors are arranged in 3 rows.

Preferably, there are three electrode tabs 3 at each end of the PTC thermistor assembly for high voltage.

Preferably, there are 5 PTC thermistors in each row.

Preferably, the metal heat conducting cavity is formed by pressing an aluminum pipe or a copper pipe.

Compared with the prior art, the utility model has the advantages that;

1) the utility model discloses a PTC thermistor piece of novel electrode structure makes heat conduction direction and current direction not in same dimension to solved under higher voltage the contradiction that the electrode spacing will be big and the heat conduction route will be short.

2) The utility model discloses can adopt the PTC thermistor of two thick electrode intervals to improve PTC thermistor withstand voltage nature, can adopt the PTC thermistor of thinner heat conduction distance simultaneously, make the inside and surperficial difference in temperature of PTC thermistor little, be favorable to the more high-efficient performance of PTC thermistor performance.

3) The utility model discloses PTC thermistor is because PTC thermistor thermal behavior uniformity is better, and the voltage that it can bear is also higher to the security and the reliability that PTC thermistor used have been guaranteed.

Drawings

Fig. 1 is a schematic view of a structure of a related art PTC thermistor.

Fig. 2 is a schematic structural view of the PTC thermistor according to the present invention.

Fig. 3 is a schematic perspective view of a metal heat pipe in the PTC thermistor assembly for high voltage application.

Fig. 4 is a perspective view of the PTC thermistor assembly for high voltage according to the present invention.

Fig. 5 is a schematic view showing a partial detachment of the PTC thermistor assembly for high voltage according to the present invention.

Fig. 6 is a schematic cross-sectional view of the PTC thermistor assembly for high voltage according to the present invention.

The figures show that: PTC thermistor body 1, electrode layer 2, electrode slice 3, plastic positioning frame 4, insulating layer 5, metal heat conduction cavity 6, heat sink 7.

Detailed Description

For better understanding of the present invention, the following description of the present invention is made with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 2, a PTC thermistor for high voltage includes a PTC thermistor body 1 and an electrode layer 2; the PTC thermistor body 1 is in a polyhedral structure, two opposite surfaces of a polyhedron are provided with electrode layers 2, an angle larger than 45 degrees is formed between the plane of the electrode layers 2 and the plane of the heat transfer surface of the PTC thermistor body, and the area ratio of the plane of the electrode layers 2 to the plane of the heat transfer surface of the PTC thermistor body is smaller than 1: 2; preferably, the PTC thermistor body 1 has a hexahedral structure, and the upper and lower planes of the hexahedral structure are a surface a and a surface B, respectively; the surface A and the surface B are heat transfer surfaces; the left plane and the right plane of the hexahedron structure are respectively a C surface and a D surface; the surface C and the surface D are respectively provided with an electrode layer 2; or the electrode layers 2 are arranged on the front plane and the rear plane of the hexahedral structure; an angle of 90 degrees is formed between the plane of the electrode layer 2 with the hexahedral structure and the plane of the heat transfer surface of the PTC thermistor body; the area ratio of the plane of the electrode layer 2 to the plane of the heat transfer surface of the PTC thermistor body is 1: 3-8.

The utility model discloses PTC thermistor's that high voltage was used electrode layer and heat transfer surface are not same face, electrode layer and heat transfer surface are not in a direction dimension promptly, square structure (hexahedron structure) PTC thermistor's electrode distribution is in the both sides face of heat transfer surface in figure 2, two faces (A face in figure 2, B face) of great area are as heat conduction surface like this, because the area is great, be favorable to its heat transfer, and the increase of its both sides face (C face in figure 2, D face) distance increases the area of its heat transfer surface on the contrary, consequently, distance between the two electrodes can be selected according to the factor such as the height of voltage, and do not receive the restriction of heat transfer factor.

As shown in fig. 4 to 6, a PTC thermistor assembly for high voltage is composed of an electrode sheet 3, a plurality of PTC thermistors, an insulating layer 5, and a metal heat-conducting cavity 6, which are connected together; the PTC thermistors are arranged in one row or a plurality of rows, the electrode layers 2 of two adjacent PTC thermistors in the row are connected, the electrode layers 2 outside the first PTC thermistor and the last PTC thermistor of the plurality of PTC thermistors arranged in the row are respectively connected with an electrode plate 3, and the electrode plates are also connected with a connecting terminal so as to be connected with an external power supply; the periphery of one row or multirow PTC thermistor is equipped with insulating layer 5, and insulating layer 5 sets up in metal heat conduction cavity 6. Preferably, a plurality of PTC thermistors are arranged in 3 rows, and there are three electrode tabs 3 at each end of the PTC thermistor assembly for high voltage; preferably 5 PTC thermistors arranged in a row. Preferably, the metal heat conducting cavity 6 is formed by pressing an aluminum pipe or a copper pipe. The structure of the metal heat-conducting cavity 6 is shown in fig. 3 and is a square cavity structure.

As shown in fig. 4 and 5, when the PTC thermistor assembly for high voltage is installed, a plastic positioning frame 4 is applied, the plastic positioning frame 4 is provided with a positioning hole site of an electrode plate 3 and a positioning groove of the PTC thermistor body 1, the electrode plate 3 is placed in the positioning hole site of the electrode plate 3, the PTC thermistor is placed in the positioning groove of the PTC thermistor body 1, and the electrode layers 2 of two adjacent PTC thermistors in a row are directly and tightly connected; the periphery of one row or a plurality of rows of PTC thermistors is wrapped with an insulating layer 5, or the row or the plurality of rows of PTC thermistors are sleeved in the insulating pipe, then a plurality of PTC thermistors provided with the insulating layer 5 are plugged into the metal heat conduction cavity 6, and the two sides of the metal heat conduction cavity 6 are pressed in parallel to slightly deform so as to tightly clamp the PTC thermistors, thereby ensuring that the heat conduction between the heat conduction surface of the PTC thermistors and the metal heat conduction cavity 6 is good, namely, the metal pipe wall of the metal heat conduction cavity 6 is tightly attached to the A surface and the B surface of the heat conduction surface of the PTC thermistors through the insulating layer 5, and realizing good heat conduction.

The utility model discloses PTC thermistor forms insulating heating tube, can regard as heating element. The typical application of the air-conditioning system is that a radiator is arranged around a PTC thermistor heating tube, and the air-conditioning system can be used as an air heater and widely applied to various air-conditioning systems.

The utility model discloses a but PTC thermistor and subassembly wide application in various heating usage that high voltage used, especially the higher occasion of voltage can be made air heater, extensively is used for automobile-used, domestic warm braw equipment.

The utility model discloses a PTC thermistor piece of novel electrode structure makes heat conduction direction and current direction not in same dimension to solved under higher voltage the contradiction that the electrode spacing will be big and the heat conduction route will be short.

The utility model can adopt the PTC thermistor which is 'thicker' (the distance between two larger electrodes, namely the distance between C, D) to improve the voltage resistance of the PTC thermistor, and can adopt the PTC thermistor which is 'thinner' (the distance between the heat conduction directions, namely the distance between A, B), so that the temperature difference between the inside and the surface of the PTC thermistor is small, thereby being beneficial to the more efficient performance of the PTC thermistor;

the utility model discloses PTC thermistor is because PTC thermistor thermal behavior uniformity is better, and the voltage that it can bear is also higher to the security and the reliability that PTC thermistor used have been guaranteed.

Claims (9)

1. A PTC thermistor for high voltage comprises a PTC thermistor body and an electrode layer; the PTC thermistor body is in a polyhedron structure, and the electrode layers are arranged on two opposite surfaces of the polyhedron structure, and the PTC thermistor is characterized in that an angle larger than 45 degrees is formed between the plane where the electrode layers are located and the plane where the heat transfer surfaces of the PTC thermistor body are located, and the area ratio of the plane where the electrode layers are located and the plane where the heat transfer surfaces of the PTC thermistor body are located is smaller than 1: 2.

2. A PTC thermistor for high voltage according to claim 1, wherein the PTC thermistor body has a hexahedral structure.

3. A PTC thermistor for high voltage use according to claim 2, wherein the upper and lower planes of the hexahedral structure are heat transfer surfaces, and the left and right planes of the hexahedral structure are provided with electrode layers, respectively; or electrode layers are provided on the front and rear planes of the hexahedral structure.

4. A PTC thermistor for high voltage according to claim 1, wherein the area ratio of the plane in which the electrode layer is located to the plane in which the heat transfer surface of the PTC thermistor body is located is 1: 3-8.

5. A PTC thermistor assembly for high voltage use comprising the PTC thermistor according to claim 1, which is composed of an electrode sheet, a plurality of PTC thermistors, an insulating layer, and a metal heat-conducting cavity which are connected; the PTC thermistors are arranged in one row or a plurality of rows, the electrode layers of two adjacent PTC thermistors in one row are connected, the electrode layers outside the first and the last PTC thermistors in the plurality of PTC thermistors arranged in one row are respectively connected with an electrode plate, and the electrode plates are also connected with a connecting terminal; the periphery of one row or multirow PTC thermistor is equipped with the insulating layer, and the insulating layer sets up in the metal heat conduction cavity.

6. A PTC thermistor assembly for high voltage according to claim 5, wherein the plurality of PTC thermistors are arranged in 3 rows.

7. A PTC thermistor assembly according to claim 6, characterized in that the number of the electrode sheets (3) at each end of the PTC thermistor assembly is three.

8. A PTC thermistor assembly for high voltage according to claim 6, characterized in that there are 5 PTC thermistors in each row.

9. A PTC thermistor assembly for high voltage according to claim 5, wherein the metal heat-conducting cavity is formed by pressing an aluminum pipe or a copper pipe.

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