CN210381352U - PTC heating single tube, PTC heating core and PTC heater - Google Patents

Abstract

The utility model provides a PTC heating single tube, a PTC heating core body and a PTC heater, which solve the technical problems of scrapping, heat dispersion reduction, sealing property and the like in the manufacturing and using processes of the existing PTC heating single tube; the silica gel shell is wrapped and connected with the outer surface of the PTC heating core, and the silica gel shell is of an integrated structure; the PTC thermistor pieces are arranged at intervals by a plurality of PTC heating pieces, and the insulating dummy pieces are arranged in the intervals; the electrode plate is provided with a long electrode plate and a plurality of short electrode plates which are arranged at intervals, each PTC heating sheet is connected with the long electrode plate, and each PTC heating sheet is connected with each short electrode plate in a one-to-one correspondence manner; every electrode slice inserted sheet one end is connected with every electrode slice, and every electrode slice inserted sheet other end passes the silica gel shell and stretches out, the utility model also discloses PTC heating core and PTC heater, but wide application in heating technical field.

Description

PTC heating single tube, PTC heating core and PTC heater

Technical Field

The utility model relates to a heating technology field, in particular to PTC single tube and PTC heating core and PTC heater generate heat that generate heat.

Background

It is known that under the condition that an automobile lacks of waste heat of an engine, the safety requirements of heating, defrosting and demisting in the automobile in winter, short service life of a power battery at low temperature and the like need an electronic heating product to provide corresponding heat, and as an important component of an automobile air conditioner heating system, a PTC heater is a good choice. Especially, the new energy automobile is most suitable.

The most important components of the PTC heater are PTC heating monotube, and the preparation process is generally as follows: the method comprises the steps of firstly respectively coating an upper electrode plate and a lower electrode plate on positive and negative electrodes of the PTC thermistor through silica gel, then wrapping the upper electrode plate and the lower electrode plate through an insulating film to complete the assembly of the PTC heating core, then inserting the PTC heating core into an aluminum pipe to be pressed, tightly pressing the insulating film, the electrode plates and the PTC thermistor to realize reliable electric conduction and heat conduction performance, and then sealing and coating sealant on two ports of the aluminum pipe to ensure the air tightness and the waterproof performance. Three problems tend to occur during manufacture and use:

(1) in the process of pressing the aluminum pipe provided with the PTC heating core, on one hand, if a punching die has slight unevenness, the electrode plate is easy to damage and break on an indentation line, so that the PTC heating core and the aluminum pipe are scrapped; on the other hand, if the stamping is not in place, a gap can be formed between the PTC heating core and the inner wall of the aluminum pipe, and the gap is used as air separation, so that the heat conduction performance of the PTC heating core to the outside can be reduced.

(2) The insulating film in the PTC heating tube has poor thermal conductivity, so that the overall heating efficiency is greatly affected.

(3) Automotive parts are subjected to harsh conditions and are subject to high frequency vibrations. In the driving process of an automobile, the PTC heating single tube vibrates at high frequency, the sealant sealed and coated on two ports of the aluminum tube is easy to loosen, the sealing effect is poor, the air tightness and the waterproof performance are seriously reduced when the PTC heating single tube is used in a humid environment, and the service life is shortened.

Disclosure of Invention

The invention aims to solve the technical defects and provide a PTC heating single tube, a PTC heating core body and a PTC heater, which have simple structures and reliable functions.

Therefore, the utility model provides a PTC heating single tube, which is provided with a shell and a PTC heating core arranged in the shell, wherein the PTC heating core is provided with a PTC thermistor sheet and an electrode plate, the electrode plate is connected with an electrode plate inserting sheet, the shell is a silica gel shell, and the PTC heating core is also provided with an insulating false sheet; the silica gel shell is wrapped and connected on the outer surface of the PTC heating core, and the silica gel shell is of an integrated structure; the PTC thermistor sheet is formed by arranging a plurality of PTC heating sheets at intervals, and the insulating dummy sheet is arranged in the interval between two adjacent PTC heating sheets; the electrode plate is provided with a long electrode plate and a plurality of short electrode plates which are arranged at intervals, one side surface of each PTC heating sheet is connected with the long electrode plate, and the other side surface of each PTC heating sheet is connected with each short electrode plate in a one-to-one correspondence manner; electrode slice inserted sheet quantity sets up to a plurality ofly, and the one end of every electrode slice inserted sheet is connected with every electrode slice, and the other end of every electrode slice inserted sheet passes the silica gel shell and stretches out.

Preferably, the long electrode plate is provided with a first groove adapted to the PTC thermistor pieces, and the upper surface of each PTC heating piece is connected in the first groove of the long electrode plate; each short electrode plate is provided with a second groove matched with the corresponding PTC heating sheet, and the lower surface of each PTC heating sheet is connected in the second groove of the corresponding short electrode plate.

Preferably, the electrode plate insertion piece is provided with an electrode plate connecting part and an external circuit connecting part, and the electrode plate connecting part and the external circuit connecting part are connected to form an L-shaped structure; the electrode plate connecting part is connected with the electrode plate, and the external circuit connecting part penetrates through the silica gel shell and extends out.

Preferably, grooves and clamping blocks are respectively arranged on two side surfaces of the silica gel shell outside the joint of the electrode plate and the electrode plate inserting piece, and the grooves are matched with the clamping blocks; when two adjacent PTC heating single tubes are arranged in parallel, the clamping block of one PTC heating single tube is correspondingly matched and inserted in the groove of the adjacent PTC heating single tube.

Preferably, the insulating dummy pieces are respectively connected with the adjacent PTC heating pieces.

Preferably, the silica gel shell is of an injection molding integrated structure.

Preferably, a plurality of first glue inlets are arranged at intervals along the edge of the long electrode plate, and a plurality of second glue inlets are arranged at intervals along the edge of the short electrode plate.

A PTC heating core body is provided with the PTC heating single tube and a radiating fin connected with the outer side face of a silica gel shell of the PTC heating single tube.

A PTC heater is provided with the PTC heating single tube.

The utility model has the advantages that: the utility model provides a PTC heating single tube, a PTC heating core body and a PTC heater, on one hand, the structure is simple, the silica gel shell replaces the aluminum tube in the prior art, and the pressing operation of the aluminum tube provided with the PTC heating core in the prior art is not needed; the surface of the PTC heating core is completely wrapped by the silica gel shell, and the silica gel has high adsorption performance, can be firmly adsorbed on the surface of the PTC heating core, and solves the technical problem that the PTC heating core and the aluminum pipe of the existing PTC heater are scrapped or the heat dissipation performance is reduced due to the pressing of the aluminum pipe. On the other hand, the outer surfaces of the long electrode plate and the short electrode plate are tightly attached to the silica gel shell, the insulation film in the prior art is not used for blocking, and the silica gel shell is made of silica gel, so that the overall heating efficiency is greatly improved. Thirdly, the silica gel shell is of an integral structure, only the other end of the electrode plate inserting piece penetrates through the silica gel shell and extends out, the sealing glue seal in the prior art is avoided, the air tightness and the waterproof grade of the PTC single tube are obviously improved, and through inspection, the waterproof performance of the PTC heating core body of the utility model can meet the protection grade requirement of IP67 or even above IP 68; silica gel belongs to rubber materials, possesses the high elasticity, can cushion vibrations under the environment of high frequency vibration to the protection parcel is at the PTC heating core in the silica gel shell and is not damaged.

Drawings

Fig. 1 is a schematic structural diagram of a front view of a PTC heating single tube of the present invention;

FIG. 2 is a schematic structural view of the left side view shown in FIG. 1;

FIG. 3 is a schematic structural view (with only the silicone shell cut away) of an enlarged view of the partial cross-sectional view shown in FIG. 2;

FIG. 4 is a schematic structural view of an enlarged view of the section A-A shown in FIG. 1;

FIG. 5 is a schematic structural view of FIG. 4 with the silicone shell removed;

FIG. 6 is a schematic structural view of the perspective view shown in FIG. 1;

fig. 7 is a schematic structural view of the PTC heat generating core shown in fig. 1;

FIG. 8 is a schematic structural view of the left side view shown in FIG. 7;

FIG. 9 is a schematic diagram of the structure of the exploded view shown in FIG. 7;

FIG. 10 is a schematic view of the structure of the long electrode shown in FIG. 9;

FIG. 11 is a schematic structural view of the left side view shown in FIG. 10;

FIG. 12 is a schematic diagram of the construction of the short electrode shown in FIG. 9;

FIG. 13 is a schematic structural view of the left side view shown in FIG. 12;

fig. 14 is a schematic structural view of the electrode pad insertion sheet shown in fig. 9;

FIG. 15 is a schematic structural view of the left side view shown in FIG. 14;

fig. 16 is a schematic structural view of a PTC heat generating core;

fig. 17 is a schematic structural view of a plurality of PTC heating cores shown in fig. 16 inserted side by side;

fig. 18 is a schematic structural diagram of the circuit diagram of the present invention.

The labels in the figure are: the PTC thermistor comprises a PTC thermistor sheet, 2 electrode plate inserting sheets, 3 silica gel shells, 4 insulating dummy sheets, 5 PTC heating sheets, 6 long electrode plates, 7 short electrode plates, 8 first grooves, 9 second grooves, 10 electrode plate connecting parts, 11 external circuit connecting parts, 12 grooves, 13 clamping blocks, 14 first glue inlet, 15 second glue inlet, 16 cooling fins, 17 PTC heating cores and an S switch.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments to assist understanding of the invention. The method used in the utility model is a conventional method if no special regulation is provided; the raw materials and the apparatus used are, unless otherwise specified, conventional commercially available products.

Example 1:

as shown in fig. 1 to 9, the utility model provides a PTC heating single tube, which comprises a housing and a PTC heating core 17 arranged in the housing, wherein the PTC heating core 17 is provided with a PTC thermistor chip 1 and an electrode plate, and the electrode plate is connected with an electrode plate insert 2; the PTC thermistor chip 1 is a heat generating element that generates heat. The shell is a silica gel shell 3, and the PTC heating core 17 is also provided with an insulating false sheet 4; the silica gel shell 3 is wrapped and connected on the outer surface of the PTC heating core 17, and the silica gel shell 3 is of an integral structure. The PTC thermistor sheet 1 is formed by arranging a plurality of PTC heating sheets 5 at intervals, and the insulating dummy sheet 4 is arranged in the interval between two adjacent PTC heating sheets 5; the insulating dummy sheet 4 mainly has two functions, on one hand, the adjacent two PTC heating sheets 5 are completely insulated, and the two PTC heating sheets are prevented from being broken down or communicated. On the other hand, the long electrode sheet 6 is prevented from being bent at the above-mentioned interval during the production and installation processes, and the stiffness of the long electrode sheet 6 is increased. The electrode plates are provided with long electrode plates 6 which are isolated from each other and a plurality of short electrode plates 7 which are arranged at intervals, and the number of the short electrode plates 7 is usually two, or more than two according to actual requirements; one side surface of each PTC heating sheet 5 is connected with the long electrode plate 6, and the other side surface of each PTC heating sheet 5 is correspondingly connected with each short electrode plate 7. The integral structure of the PTC heating core 17 realizes the zone control of the circuit in the PTC heating core 17, on one hand, when the circuit where one short electrode plate 7 is positioned fails due to the problems of fragmentation and the like, the use of the parallel circuit where other short electrode plates 7 are positioned in the PTC heating core 17 is not influenced; on the other hand, when the heating value needs to be increased or decreased, the on-off control of the switch S of the sub-circuit connected to the short electrode plate 7 can be performed, so as to control the PTC heating plates 5 connected to the corresponding short electrode plates 7 in the PTC heating core 17 to be heated when the power is turned on or not heated when the power is turned off, thereby realizing the flexible adjustment of the rising or falling of the external heating value by the PTC heating core 17. The number of the electrode plate inserting pieces 2 is set to be a plurality of, one end of each electrode plate inserting piece 2 is connected with each electrode plate, and the other end of each electrode plate inserting piece 2 penetrates through the silica gel shell 3 and extends out. The PTC heating core 17 is connected with an external circuit through the electrode plate inserting piece 2, wherein the long electrode plate 6 is communicated with the positive electrode, and the two short electrode plates 7 are respectively communicated with the negative electrode, so that the partitioned control of the circuit in the PTC heating core 17 is realized; when the long electrode plate 6 and the short electrode plate 7 in the PTC heating core 17 are electrified, the PTC thermistor sheet 1 generates heat and transfers the heat to the silica gel shell 3, and then the heat is transferred outwards from the silica gel shell 3.

The utility model provides a PTC heating single tube, on one hand, the structure is simple, the silica gel shell 3 replaces the aluminum tube in the prior art, and the pressing operation of the aluminum tube provided with the PTC heating core in the prior art is not needed; the surface of the PTC heating core 17 of the utility model is completely wrapped by the silica gel shell 3, and the silica gel adsorbability can be firmly adsorbed on the surface of the PTC heating core 17, thereby solving the technical problems that the PTC heating core and the aluminum pipe are scrapped or the heat dissipation performance is reduced due to the pressing of the aluminum pipe of the prior PTC heater; and the silica gel shell 3 is used as a rubber material, and has good insulativity compared with the metal material of the aluminum pipe in the prior art. On the other hand, the outer surfaces of the long electrode plate 6 and the short electrode plate 7 are tightly attached to the silica gel shell 3 without the insulation film barrier of the prior art, and the silica gel shell 3 is made of silica gel, so that the overall heating efficiency is greatly improved. Thirdly, the silica gel shell 3 is of an integral structure, only the other end of the electrode plate inserting piece 2 passes through the silica gel shell 3 and extends out, and the sealing of the sealant in the prior art is avoided, so that the air tightness and the waterproof grade of the PTC single tube are obviously improved, and through inspection, the waterproof performance of the PTC heating single tube can meet the protection grade requirements of IP67 or even IP68 and above; the silica gel belongs to rubber materials, has high elasticity, and can buffer vibration in the environment of high-frequency vibration, thereby protecting the PTC heating core 17 wrapped in the silica gel shell 3 from being damaged.

As a preference of the present embodiment, as shown in fig. 3 to 5, 10 and 12, the long electrode sheet 6 is provided with a first groove 8 adapted to the PTC thermistor tabs 1, and the upper surface of each PTC heat generating sheet 5 is connected in the first groove 8 of the long electrode sheet 6; each short electrode plate 7 is provided with a second groove 9 matched with the corresponding PTC heating sheet 5, and the lower surface of each PTC heating sheet 5 is connected in the second groove 9 of the corresponding short electrode plate 7. The first groove 8 and the second groove 9 play a positioning role, so that the PTC thermistor sheet 1 is convenient to mount and fix, and the PTC thermistor sheet 1 is prevented from sliding and losing efficacy in the mounting and using processes. From another perspective, the first recess 8 and the second recess 9 also function to position the long electrode tab 6 and the short electrode tab 7 with the PTC thermistor tabs 1. The electrode plate is made of aluminum, so that the electrode plate is low in cost and good in heat conduction and electric conduction performance.

As shown in fig. 3, 7-9, 14 and 15, the electrode tab insert 2 of the present embodiment preferably includes an electrode tab connecting portion 10 and an external circuit connecting portion 11, and the electrode tab connecting portion 10 and the external circuit connecting portion 11 are connected to each other to form an L-shaped structure; the electrode pad connecting part 10 is connected with the electrode pad, one end part of the external circuit connecting part 11 is connected with the electrode pad connecting part 10, and the other end part of the external circuit connecting part 11 penetrates through the silica gel shell 3 and extends out for being connected with an external circuit. The L-shaped structural design of the electrode plate inserting piece 2 can increase the contact area between the electrode plate inserting piece 2 and the electrode plate, so that the passing current is increased, and overheating and burning-out caused by overlarge resistance are prevented. The electrode plate insert 2 is usually made of copper, has good conductivity,

as a preferred embodiment, referring to fig. 1 to 4, grooves 12 and clamping blocks 13 are respectively formed on two side surfaces of the silica gel housing 3 located outside the connection position of the electrode plate and the electrode plate insert 2, and the grooves 12 and the clamping blocks 13 are adaptive in shape and structure; when two adjacent PTC heating single tubes are arranged in parallel, the fixture block 13 of one PTC heating single tube is correspondingly inserted into the groove 12 of the adjacent PTC heating single tube. As shown in fig. 16, the grooves 12 of the silica gel housings 3 of two adjacent PTC heating single tubes are connected with the fixture blocks 13 in an adaptive manner, so that a plurality of PTC heating single tubes can be conveniently mounted, and the working efficiency is improved.

Preferably, as shown in fig. 3, the insulating dummy pieces 4 are connected to the adjacent PTC heating pieces 5, respectively, so that each PTC heating piece 5 of the PTC thermistor sheet 1 is more firmly fixed during installation and use, and displacement thereof is prevented, and each circuit controlled by the partition in the PTC heating core 17 is more stable during power-on use.

As the preferred of this embodiment, silica gel shell 3 is the integrated into one piece structure of moulding plastics, and PTC generates heat the single tube promptly and adopts current insert molding technology, the utility model discloses PTC generates heat core 17 as the different material inserts. In the manufacturing process, the prepared PTC heating core 17 is filled in a mould matched with the shape of the outer surface of the silica gel shell 3, then the silica gel is injected, and the melted silica gel is jointed and solidified with the PTC heating core 17. The integrally molded silica gel shell 3 is injected to completely wrap the PTC heating core 17, namely, the inner wall of the silica gel shell 3 is tightly connected with the outer surface of the PTC heating core 17 without hot bad conductor air separation, and only the other end part of the external circuit connecting part 11 of the electrode plate insertion piece 2 of the silica gel shell 3 is exposed and is used for being communicated with an external circuit; and sealing the external circuit connecting part 11 of the electrode plate insert 2 which is connected with the external circuit and exposed out of the silica gel shell 3. The injection molding integrated molding structure of the silica gel shell 3 is combined with the good heat conduction, insulation performance and plasticity of the silica gel, so that the heating efficiency, insulation performance and production process of the PTC heating single tube are further improved; the whole single tube is similar to a completely closed state, the waterproofness is further enhanced, and the requirement of IP68 and above grades can be met; in addition, compared with the pipe pressing process in the prior art, the pipe pressing process is simple to operate, and the risk that the PTC heating single pipe is scrapped or the heat dissipation performance is reduced does not exist; the silica gel has stable chemical property, convenient production and processing and strong practicability. As a further preferred embodiment of this embodiment, as shown in fig. 5, 10, and 12, a plurality of first glue inlets 14 are provided at intervals along the edge of the long electrode sheet 6, and a plurality of second glue inlets 15 are provided at intervals along the edge of the short electrode sheet 7. When the PTC heating core 17 is placed into a mold as a dissimilar material insert for injection molding, a part of molten silica gel flows into the first glue inlet 14 and the second glue inlet 15, after solidification, the silica gel positioned in the first glue inlet 14 and the second glue inlet 15 plays a role in connecting the silica gel positioned at the outer side and the inner side of the long electrode plate 6 and the short electrode plate 7, on one hand, the connection among the long electrode plate 6, the short electrode plate 7 and the PTC thermistor chip 1 is enhanced, and the circulation of a circuit of the PTC heating core 17 is ensured when in use; on the other hand, the tightness between the outer surfaces of the long electrode plate 6 and the short electrode plate 7 and the silica gel shell 3 connected with the long electrode plate and the short electrode plate is enhanced, delamination is prevented, and the long electrode plate and the short electrode plate are kept in a tight connection state. It should be noted that the injection molding integrated into one piece structure of the silica gel housing 3 is not only suitable for the PTC heating core 17 of the present invention, but also suitable for the PTC heating core of the prior art.

Example 2:

as shown in fig. 16 and 17, the present invention provides a PTC heating core, which is provided with a PTC heating single tube as described in embodiment 1, and a heat sink 16 connected to the outer side surface of the silica gel housing 3 of the PTC heating single tube. The radiating aluminum sheet is used for further improving the radiating effect. When the heat dissipation aluminum sheet is used, when the electrode sheet is electrified, the PTC heating core 17 generates heat and transfers the heat to the silica gel shell 3, and then the silica gel shell 3 transfers the heat outwards through the heat dissipation aluminum sheet.

Example 3:

the utility model provides a PTC heater, it is equipped with the above-mentioned PTC of embodiment 1 or embodiment 2 and generates heat the single tube. The PTC heater mainly comprises the heating core body and the electrical connection support seat in embodiment 2, wherein the heating core body is provided with the PTC heating single tube in embodiment 1 and the radiating fins 16 connected with the outer side surface of the silica gel shell 3 of the PTC heating single tube. The heating core is fixed with the electric connection supporting seat, and is usually fixed with the electric connection supporting seat in an inserting manner; the electrical connection support base is an existing device. The electrode plate of the PTC heater is electrically connected with an external power controller after passing through the electric connection supporting seat by a circuit. Under the control of the power supply controller, for example, when the electrode plate is electrified, the PTC heating core 17 generates heat and transfers the heat to the silica gel shell 3, and the heat of the silica gel shell 3 is dissipated outwards by the heat dissipation aluminum sheet. (Tujia)

It should be noted that, in the above embodiments, the terms "first" and "second" do not represent an absolute distinction relationship in structure and/or function, nor represent a sequential execution order, but merely for convenience of description.

In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", "top", "bottom", "front", "rear", "inner", "outer", "back", "middle", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

However, the above description is only an embodiment of the present invention, and the scope of the present invention should not be limited thereto, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should be covered by the claims of the present invention.

Claims (9)

1. A PTC heating single tube is provided with a shell and a PTC heating core arranged in the shell, wherein the PTC heating core is provided with a PTC thermistor sheet and an electrode plate, and the electrode plate is connected with an electrode plate insertion sheet; the silica gel shell is wrapped and connected on the outer surface of the PTC heating core, and the silica gel shell is of an integrated structure; the PTC thermistor pieces are formed by arranging a plurality of PTC heating pieces at intervals, and the insulating dummy pieces are arranged in the intervals between every two adjacent PTC heating pieces; the electrode plates are provided with long electrode plates and a plurality of short electrode plates which are arranged at intervals, one side surface of each PTC heating sheet is connected with the long electrode plates, and the other side surface of each PTC heating sheet is correspondingly connected with each short electrode plate; the electrode slice inserting pieces are arranged in a plurality of numbers, each electrode slice inserting piece is connected with each electrode slice, and the other end of each electrode slice inserting piece penetrates through the silica gel shell and extends out.

2. A PTC heating monotube according to claim 1, wherein the long electrode sheet is provided with a first recess adapted to the PTC thermistor chips, and an upper surface of each of the PTC heating chips is attached to the first recess of the long electrode sheet; each short electrode plate is provided with a second groove matched with the corresponding PTC heating sheet, and the lower surface of each PTC heating sheet is connected into the second groove of the corresponding short electrode plate.

3. A PTC heating monotube according to claim 1, wherein the electrode tab insertion piece is provided with an electrode tab connection part and an external circuit connection part, which are connected to each other in an L-shaped configuration; the electrode plate connecting part is connected with the electrode plate, and the external circuit connecting part penetrates through the silica gel shell and extends out.

4. A PTC heating monotube according to claim 1, wherein grooves and clamping blocks are respectively arranged on two side faces of the silica gel casing outside the connection of the electrode plate and the electrode plate insertion piece, and the grooves are matched with the clamping blocks; when two adjacent PTC heating single tubes are arranged in parallel, the clamping block of one PTC heating single tube is correspondingly matched and inserted in the groove of the adjacent PTC heating single tube.

5. A PTC heating monotube according to claim 1, wherein the insulating dummy pieces are connected to the adjacent PTC heating pieces, respectively.

6. A PTC heating monotube according to any one of claims 1 to 5, wherein the silica gel shell is an injection molded integral structure.

7. A PTC heating monotube according to claim 6, wherein a plurality of first glue inlets are provided at intervals along the edge of the long electrode sheet, and a plurality of second glue inlets are provided at intervals along the edge of the short electrode sheet.

8. A PTC heating core, characterized in that it is provided with a PTC heating monotube according to any one of claims 1 to 7, and a heat radiating fin connected with the outer side of the silica gel case of the PTC heating monotube.

9. A PTC heater, characterized in that it is provided with a PTC heat-generating single tube according to any one of claims 1 to 7.

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