CN215935119U

CN215935119U - PTC heater

Info

Publication number: CN215935119U
Application number: CN202121977640.XU
Authority: CN
Inventors: 曹黎霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-03-01
Anticipated expiration: 2031-08-20

Abstract

The utility model belongs to the technical field of PTC heating, and particularly relates to a PTC heater. Aiming at the defects of more electric connection parts of the existing PTC heater, the utility model adopts the following technical scheme: a PTC heater comprising: a plurality of metal heat sinks, wherein each metal heat sink comprises an outer pressing plate and an inner pressing plate; at least two groups of PTC heating sheet groups: at least two rivet tabs; a thermal circuit breaker; the PTC heating elements are connected in parallel between adjacent metal radiators to form heating units, at least two heating units are arranged, and all the heating units are connected in parallel; two outer pressing plates or two inner pressing plates positioned on the outer sides of two adjacent PTC heating plate groups are connected into a whole in pairs. The PTC heater of the utility model has the advantages that: the number of the electric connection positions is reduced by connecting the outer pressing plate or the inner pressing plate instead of the riveting sheet and the wiring terminal.

Description

PTC heater

Technical Field

The utility model belongs to the technical field of PTC heating, and particularly relates to a PTC heater.

Background

The existing PTC heater (also called as PTC heating element) is mostly composed of a galvanized outer pressing plate, a stainless steel corrugated spring sheet, a galvanized inner pressing plate, a PTC heating sheet, a nickel-plated copper electrode terminal, a PPS high-temperature plastic electrode sheath and the like. The existing PTC heater adopts corrugated radiating fins, improves the radiating rate, integrates the advantages of adhesion and mechanical type, fully considers various thermal and electrical phenomena of a PTC heating piece during working, and has strong binding force, excellent heat conduction and radiating performance, high efficiency, safety and reliability. The PTC heater has the prominent characteristic of safety performance, namely, when the fan stops due to failure, the power of the PTC heater can automatically and rapidly reduce because the PTC heater cannot fully dissipate heat, and the surface temperature of the heater is maintained at about Curie temperature (generally about 250 ℃), so that the surface of the heater such as an electric heating tube heater cannot be reddened.

Referring to fig. 1, a conventional PTC heater employs a plurality of PTCRs connected in parallel, and the PTCRs connected in parallel are also connected in parallel. Terminals are arranged between each set of PTCRs for connection to a power supply, the distance between the two terminals being the sum of the thickness of the two metal heat sinks and the thickness of one PTCR, which is typically less than 20 mm. However, the size of the thermal cutout of the PTCR heater is not less than 34 mm. Therefore, the distance between the two terminals is not sufficient to accommodate the thermal cut-out, which must be placed on the other side. Because the thermal circuit breaker is located the opposite side, need increase parts such as wire and connect the thermal circuit breaker of remote department in the circuit of PTCR heater like this, lead to the structure complicacy, the contact point of heavy current increases, increases the potential safety hazard.

Referring to fig. 2, there are six conductive connections from the metal heat sink to the thermal break to the lead wires of the prior art PTC heater. When a device with high current such as PTC works, the current flowing through the contact point reaches 10A-20A, and even when the contact resistance is only 0.1 ohm, the generated heat can cause the temperature rise of the terminal to 90 ℃ or even higher due to the small heat dissipation area, so the high temperature rise brings loss of energy consumption and risk of fire. The thermal cut-out for the existing PTC heaters also has two conductive rivets or crimps from the main body of the circuit breaker to the cable.

In order to solve the problem of the PTC heater in fig. 1 and 2 that there are many electrical connections, the chinese utility model patent with the publication number of CN213026581U discloses a PTC heater, which includes: a plurality of metal heat sinks; the PTC heating sheets are adhered between adjacent metal radiators; the PTC heating elements are connected in parallel between adjacent metal radiators to form heating units, and at least two heating units are connected in series; at least two riveting sheets, wherein the riveting sheets are arranged on the metal radiator; a thermal interrupter riveted to one of the riveting tabs. In the PTC heater, from the metal heat sink to the lead, there are only four (when the first connector is integrally formed without electrical connection inside) or five (the first connector has one electrical connection) electrical connections, and compared with the total of nine electrical connections from the metal heat sink to the lead in fig. 1 and 2, the number of electrical connections is greatly reduced.

However, the PTC heater of fig. 3 has at least two heat generating units connected in series, and there is no PTC heater having a small number of electrical connections when the heat generating units are connected in parallel in the prior art. In addition, the conventional PTC heater, in which the rivet tab and the connector are disposed in the same direction, results in a large volume of the PTC heater.

Disclosure of Invention

The utility model provides a PTC heater, which aims at the defects that a metal radiator of the existing PTC heater is connected with a breaker main body of a thermal breaker by adopting a lead wire, and the electric connection position is more, or the electric connection position between the breaker main body of the thermal breaker of the existing PTC heater and a power supply lead wire is more, and the heating units are connected in parallel and the electric connection position is reduced.

In order to achieve the purpose, the utility model adopts the following technical scheme: a PTC heater, comprising:

a plurality of metal heat sinks including an outer platen and an inner platen;

at least two sets of PTC heating plate groups, PTC heating plate group includes the parallelly connected PTC heating plate of multi-disc, PTC heating plate glues between adjacent metal radiator:

at least two riveting sheets, wherein the riveting sheets are arranged on the metal radiator;

the thermal circuit breaker is connected with one riveting sheet;

the PTC heating sheet group between the adjacent metal radiators and the adjacent metal radiators form heating units, the number of the heating units is at least two, and all the heating units are connected in parallel;

two outer pressing plates or two inner pressing plates positioned on the outer sides of two adjacent PTC heating plate groups are connected into a whole in pairs.

The PTC heater of the utility model replaces the connection of the riveting sheet and the wiring terminal by the connection between the outer pressure plate and the inner pressure plate, thereby reducing the number of electric connection positions. Two outer pressing plates or inner pressing plates positioned on the outer sides of two adjacent PTC heating plate groups are connected into a whole in pairs, and the outer pressing plates, the outer pressing plates and the inner pressing plates can be connected.

As an improvement, two inner pressure plates positioned at the outer sides of two adjacent PTC heating plate groups are integrally formed.

As an improvement, two inner pressure plates positioned at the outer sides of two adjacent PTC heating sheet groups are integrally formed by bending.

As a modification, all the rivet pieces are located at the same end of the PTC heater in the height direction, and the thermal cut-off is arranged between two adjacent rivet pieces. The height direction of the PTC heater refers to the arrangement direction of the PTC heating sheets in the PTC heating sheet group.

As an improvement, the joint of the two inner pressure plates positioned at the outer sides of the two adjacent groups of the PTC heating plate groups is positioned at one end of the PTC heater opposite to the riveting sheet.

As an improvement, two riveting sheets adjacent to the thermal circuit breaker are arranged at one end, far away from the thermal circuit breaker, of the corresponding metal radiator along the thickness direction of the PTC heating sheet.

In an improvement, the rivet piece is connected to the wire through a first connector, the first connector has a rivet portion connected to the rivet piece and a crimping portion crimped to the wire, and the rivet portion of the first connector is perpendicular to the crimping portion.

As a refinement, the first connector is in one piece.

As an improvement, the riveting sheet is connected with wires, and the leading-out directions of all the wires are the same.

As an improvement, thermal circuit breaker includes circuit breaker main part, second connector and third connector, the circuit breaker main part has first electric connection post and second electric connection post, second connector one end with the riveting piece is riveted, the other end with the riveting of first electric connection post, third connector one end with the riveting of second electric connection post, the other end compresses tightly with the wire.

As a refinement, the second connector and the third connector are one piece.

As an improvement, the PTC heating sheet groups are divided into two groups, and the number of the leads is two; or

The PTC heating sheet groups are three groups, and the number of the conducting wires is three; or

The PTC heating sheet groups are four groups, and the number of the leads is three.

The integral inner pressing plate of the PTC heater is integrally formed and comprises two parallel parts and a vertical part for connecting the two parallel parts.

The PTC heater of the utility model has the advantages that: the number of the electric connection positions is reduced by connecting the outer pressing plate or the inner pressing plate instead of the riveting sheet and the wiring terminal.

The inner pressure plate of the PTC heater has the advantages that: the clamp plate integrated into one piece replaces riveting piece and binding post electrically conductive connection two adjacent heating elements, reduces electric connection department quantity.

Drawings

Fig. 1 is a schematic view of a conventional PTC heater.

Fig. 2 is a simplified wiring structure of a conventional PTC heater.

Fig. 3 is a schematic structural view of a PTC heater according to a first embodiment of the present invention.

Fig. 4 is an exploded view of a PTC heater according to a first embodiment of the present invention.

Fig. 5 is a schematic structural view of an inner pressure plate of a PTC heater according to a first embodiment of the present invention.

Fig. 6 is a schematic structural view of a PTC heater according to a second embodiment of the present invention.

In the figure, 1, an outer press plate;

2. a corrugated fin;

3. an integrated inner pressure plate; 31. a parallel portion; 32. a vertical portion;

4. a PTC heating sheet group;

5. riveting the connecting sheet;

6. a thermal circuit breaker; 61. a circuit breaker main body; 62. a second connector; 63. a third connector;

7. a first connector;

8. and (4) conducting wires.

Detailed Description

The technical solutions of the embodiments of the present invention will be explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and are not all embodiments. Other embodiments obtained by persons skilled in the art without any inventive work based on the embodiments in the embodiment belong to the protection scope of the utility model.

Referring to fig. 3 to 6, a PTC heater of the present invention comprises:

a plurality of metal heat sinks including an outer pressing plate 1 and an inner pressing plate;

at least two groups of PTC heating plate groups 4, PTC heating plate group 4 includes the parallelly connected PTC heating plate of multi-disc, PTC heating plate glues between adjacent metal radiator:

at least two riveting sheets 5, wherein the riveting sheets 5 are arranged on the metal radiator;

a thermal cut-off 6, the thermal cut-off 6 being connected to the rivet 5;

the PTC heating elements are connected in parallel between adjacent metal radiators to form heating units, at least two heating units are arranged, and all the heating units are connected in parallel;

two outer pressing plates 1 or two inner pressing plates positioned at the outer sides of two adjacent PTC heating plate groups 4 are connected into a whole in pairs.

The PTC heater of the utility model replaces the connection between the riveting sheet 5 and the wiring terminal by the connection between the outer pressing plate 1 or the inner pressing plate, thereby reducing the number of electric connection positions. Two outer pressing plates 1 or inner pressing plates positioned at the outer sides of two adjacent PTC heating plate groups 4 are connected into a whole in pairs, and the connection between the outer pressing plates 1 and the outer pressing plates 1, between the outer pressing plates 1 and the inner pressing plates, and between the inner pressing plates and the inner pressing plates can be realized.

PTC Heater of embodiment one

Referring to fig. 3 to 5, a PTC heater of the present invention comprises:

the heat radiator comprises a plurality of metal heat radiators, a plurality of heat radiating fins and a plurality of heat radiating fins, wherein the metal heat radiators comprise an outer pressing plate 1, an inner pressing plate and corrugated heat radiating fins 2 positioned between the outer pressing plate 1 and the inner pressing plate;

a thermal cut-off 6, the thermal cut-off 6 being connected to the rivet 5;

the PTC heating elements are connected in parallel between adjacent metal radiators to form three heating units;

wherein, two inner press plates at the outer sides of two adjacent PTC heating plate groups 4 are connected into a whole. The number of the integrated inner pressing plates 3 is one.

In other embodiments, the inner pressure plate and the outer pressure plate 1 or the outer pressure plate 1 and the outer pressure plate 1 may be connected into a whole.

In this embodiment, two inner press plates located outside two adjacent PTC heating sheet groups 4 are integrally formed.

In this embodiment, two inner pressing plates located outside two adjacent groups of PTC heating element groups 4 are integrally formed by bending, that is, two heating elements share the same plate. In other embodiments, the two inner press plates can also be connected into a whole by welding and the like.

In this embodiment, all the rivet pieces 5 are located at the same end in the height direction of the PTC heater, and the thermal cut-off 6 is disposed between two adjacent rivet pieces 5.

In this embodiment, two riveting pieces 5 adjacent to the thermal circuit breaker 6 are both arranged on the corresponding metal radiator and are far away from one end of the thermal circuit breaker 6 along the thickness direction of the PTC heating piece.

In this embodiment, the rivet 5 is connected to the wire 8 through a first connector 7, the first connector 7 has a rivet portion connected to the rivet 5 and a crimping portion crimped to the wire 8, and the rivet portion of the first connector 7 is perpendicular to the crimping portion to reduce the volume.

In this embodiment, the first connector 7 is a single piece, thereby reducing the number of electrical connections.

In this embodiment, the rivet piece 5 is connected with a lead 8, and all the leads 8 are led out in the same direction.

In this embodiment, the thermal circuit breaker 6 includes a breaker main body 61, a second connector 62 and a third connector 63, the breaker main body 61 has a first electrical connection post and a second electrical connection post, the second connector 62 one end with the riveting piece 5 is riveted, the other end with the first electrical connection post is riveted, the third connector 63 one end with the second electrical connection post is riveted, the other end compresses tightly with the wire 8.

In the present embodiment, the second connector 62 and the third connector 63 are a single piece, thereby reducing the number of electrical connections.

In this embodiment, the number of the PTC heating sheet groups 4 is three, and the number of the conducting wires 8 is three.

The PTC heater of the first embodiment of the utility model has the beneficial effects that: the connection between the riveting sheet 5 and the wiring terminal is replaced by the connection between the outer pressing plate 1 or the inner pressing plate, so that the number of electric connection positions is reduced; the thermal circuit breaker 6 and all the riveting sheets 5 are arranged at the same end of the PTC heater, so that the size of the PTC heater is reduced, a cross-connection line and a terminal are eliminated, and a live wire is shortened; the thermal circuit breaker is arranged between the riveting sheets, so that the influence of the thermal circuit breaker on air inlet and outlet is eliminated; all the lead wires are led out in the same direction, so that the assembly is convenient.

PTC Heater of example two

The second embodiment is different from the first embodiment in the number of heat generating units.

Referring to fig. 6, in the present embodiment, four heating units are connected in parallel, and four groups of PTC heating sheet groups 4 are provided. The number of the integrated inner pressing plates 3 is two.

Other structures and effects of this embodiment are the same as those of the first embodiment, and are not described herein.

While the utility model has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the utility model is not limited thereto but is intended to cover various modifications and changes, including but not limited to the details shown in the drawings and described in the foregoing detailed description. Any modification which does not depart from the functional and structural principles of the utility model is intended to be included within the scope of the following claims.

Claims

1. A PTC heater characterized by: the PTC heater includes:

a plurality of metal heat sinks including an outer platen (1) and an inner platen;

at least two groups of PTC heating piece groups (4), PTC heating piece group (4) include the PTC heating piece that the multi-disc is parallelly connected, PTC heating piece glues between adjacent metal radiator:

at least two riveting sheets (5), wherein the riveting sheets (5) are arranged on the metal radiator;

a thermal circuit breaker (6), wherein the thermal circuit breaker (6) is connected with one riveting sheet (5);

the PTC heating sheet groups (4) between the adjacent metal radiators form at least two heating units, and all the heating units are connected in parallel;

two outer pressing plates (1) or inner pressing plates positioned on the outer sides of two adjacent PTC heating plate groups (4) are connected into a whole in pairs.

2. A PTC heater according to claim 1, wherein: and two inner pressing plates positioned at the outer sides of the two adjacent PTC heating plate groups (4) are integrally formed.

3. A PTC heater according to claim 1, wherein: all riveting piece (5) all are located same one end of PTC heater direction of height, hot circuit breaker (6) are located between two adjacent riveting pieces (5), are located adjacent two sets of the junction of two interior clamp plates in PTC heating piece group (4) outside is located PTC heater with the opposite one end of riveting piece (5).

4. A PTC heater according to claim 3, wherein: and two riveting sheets (5) adjacent to the thermal circuit breaker (6) are arranged on the corresponding metal radiator and are far away from one end of the thermal circuit breaker (6) along the thickness direction of the PTC heating sheet.

5. A PTC heater according to claim 1, wherein: the riveting sheet (5) is connected with a lead (8) through a first connector (7), the first connector (7) is provided with a riveting part connected with the riveting sheet (5) and a crimping part crimped with the lead (8), and the riveting part of the first connector (7) is perpendicular to the crimping part.

6. A PTC heater according to claim 1, wherein: and the riveting sheet (5) is connected with a lead (8), and the leading-out directions of all the leads (8) are the same.

7. A PTC heater according to claim 1, wherein: hot breaker (6) include circuit breaker main part (61), second connector (62) and third connector (63), circuit breaker main part (61) have first electric connection post and second electric connection post, second connector (62) one end with riveting piece (5) riveting, the other end with the riveting of first electric connection post, third connector (63) one end with the riveting of second electric connection post, the other end compresses tightly with wire (8).

8. A PTC heater according to claim 7, wherein: the second connector (62) and the third connector (63) are in one piece.

9. A PTC heater according to claim 1, wherein: two groups of PTC heating sheet groups (4) are provided, the riveting sheet (5) is connected with two leads (8), and the number of the leads (8) is two; or

The PTC heating sheet groups (4) are three groups, the riveting sheets (5) are connected with three leads (8), and the number of the leads (8) is three; or

PTC heating chip group (4) are four groups, rivet connecting piece (5) and go up connecting wire (8), wire (8) have three.