CN212278486U

CN212278486U - High-voltage-resistance PTC heater

Info

Publication number: CN212278486U
Application number: CN202021421617.8U
Authority: CN
Inventors: 高守勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-15
Filing date: 2020-07-17
Publication date: 2021-01-01
Anticipated expiration: 2030-07-17
Also published as: CN112040579A; CN111867162A; CN213026581U; CN212344084U

Abstract

The utility model belongs to the technical field of the PTC heating, concretely relates to high withstand voltage PTC heater. Adopt the form of connecting in parallel to lead to the lower not enough of electric compressive strength to current PTC heater, the utility model discloses a following technical scheme: a high withstand voltage PTC heater, comprising: a plurality of metal heat sinks; PTC heating element, PTC heating element includes the PTC heating sheet of multi-disc interval distribution, PTC heating element glues between the adjacent metal radiator of series connection: the wiring terminals are arranged on the metal radiator; wherein, connect adjacent metal radiator in series and connect PTC heating element between the adjacent metal radiator in series and form the heating unit, the heating unit has a plurality ofly, at least two the heating unit series connection. The utility model has the advantages that: the heating units comprising at least two metal radiators and PTC heating sheets are connected in series, and the series connection mode is higher in compressive strength than the parallel connection mode under the same condition.

Description

High-voltage-resistance PTC heater

Technical Field

The utility model belongs to the technical field of the PTC heating, concretely relates to high withstand voltage PTC heater.

Background

The PTC heater is also called as a PTC heating body and consists of a galvanized outer pressing plate, a stainless steel corrugated spring piece, a galvanized inner pressing plate, a PTC heating piece, a nickel-plated copper electrode terminal, a PPS high-temperature plastic electrode sheath and the like. The PTC heater adopts the corrugated radiating fins, so that the radiating rate of the PTC heater is improved, the advantages of adhesion and mechanical type are integrated, various thermal and electrical phenomena of the PTC heating piece during working are fully considered, the binding force is strong, the heat conduction and radiating performance are excellent, the efficiency is high, and the PTC heater is safe and reliable. 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.

The current industry standard is as follows: QBT 2164-: a heat generator for mechanically heating the air flow is composed of one or more parallel PTCRs and metallic heat radiator. Item 5.3.3 definition of withstand voltage: when the rated voltage of the heater is 220V, the withstand voltage value of the heater is not less than 500V; when the rated voltage is 110V, the withstand voltage value should not be less than 350V.

Referring to fig. 1, a conventional PTC heater employs a plurality of PTCRs (PTC heat generating sheets) connected in parallel, and the PTCRs connected in parallel are also connected in parallel. In actual testing, it is often the case that the PTCR breaks down. This is because the material and processing process of the PTCR are limited, and the compressive strength of the PTCR is insufficient when the thickness is fixed. One approach to increasing compressive strength is to increase the PTCR thickness. However, since the PTCR itself has thermal resistance, an increase in the thickness of the PTCR causes an increase in the thermal resistance, thereby lowering the heat generation efficiency of the PTC heater. Another way to increase compressive strength is to improve the performance of the PTCR such that a thinner PTCR can achieve sufficient compressive strength. However, the difficulty of developing to improve the performance of PTCRs is conceivable.

In addition, in the conventional PTC heater with multiple PTCRs, a terminal is disposed between each PTCR group for connecting a power supply, and the distance between two terminals is the sum of two thicknesses of the metal heat sink and one thickness of the PTCR, which is generally 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 position in the circuit of PTC heater like this, not only the structure is complicated, and the contact point of heavy current increases, increases the potential safety hazard, and material cost and cost of labor are higher moreover.

Disclosure of Invention

The utility model discloses to the less not enough of current PTC heater's electric compressive strength, provide a high withstand voltage's PTC heater, effectively promote its electric compressive strength.

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

a plurality of metal heat sinks;

the PTC heating sheets are glued 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.

The utility model discloses a PTC heater, it has two and the series connection including the unit that generates heat of metal radiator and PTC piece at least, if adopt the same PTC piece that generates heat and insert the voltage identical condition under the same condition, the parallelly connected mode is compared in the series connection, and compressive strength is higher. The power of the PTC heater can be adjusted by replacing the PTC heating sheet so as to meet corresponding standards or meet corresponding requirements.

As an improvement, the metal radiator comprises an outer pressing plate, an inner pressing plate and corrugated radiating fins arranged between the outer pressing plate and the inner pressing plate, and the wiring terminal is arranged on the outer pressing plate. Wherein, the outer pressing plate is a flat plate, and the inner pressing plate is a U-shaped plate. A lug is raised on the flat plate to form a terminal.

As an improvement, the heating units which are adjacent in series share the outer pressing plate and/or the inner pressing plate. The heating units which are connected in series and adjacent share the outer pressing plate and/or the inner pressing plate, and the processing and the assembly are easy.

As a modification, the heat generating units adjacent in series are connected by a separate connecting member. The heating units are connected through the independent connecting pieces, the heating units can be connected in series when the heating device is used, and the single heating unit is small in size and convenient to package, transport and store.

As an improvement, all the heating units are connected in series along the thickness direction of the PTC heating sheet, all the wiring terminals are positioned at the same end of the PTC heater, and one of the wiring terminals is also provided with a thermal breaker. The connecting terminal is positioned at the same end of the PTC heater, and the thermal circuit breaker is arranged on one connecting terminal, so that a cross-connecting line and the connecting terminal can be eliminated, a live wire is shortened, and the cost is reduced.

As an improvement, the heating units which are adjacent in series share the outer pressing plate.

As an improvement, the binding post has three, hot circuit breaker locates on the binding post in the middle. The thermal circuit breaker is arranged at the middle position instead of the outer end, so that the space between the two wiring terminals can be utilized, and the whole PTC heater occupies less space.

As an improvement, the number of the connecting terminals is two, and the thermal breaker is arranged on one of the connecting terminals.

As the improvement, a plurality of the heating units are connected in series along the length direction, the number of the wiring terminals is two and is positioned at the two ends of the PTC heater, and one wiring terminal is also provided with a thermal circuit breaker. The heating units are connected in series along the length direction to obtain different shapes, so that the heating device is suitable for different scenes.

As an improvement, the heating units which are connected in series and adjacent share the outer pressing plate, the inner pressing plate and the corrugated radiating fins.

As a modification, the number of the heating units is two, and the two heating units are connected in series.

As an improvement, the number of the heating units is four, and the four heating units are connected in parallel after being connected in series two by two.

As a modification, the heating units are three, and the three heating units are connected in series.

As a modification, the number of the heating units is four, and the four heating units are connected in series.

As a refinement, there are three of the heat generating units, two of which are connected in series and in parallel with another heat generating unit.

In a refinement, the heating units are four, wherein three heating units are connected in series and in parallel with another heating unit.

As a modification, the PTC heating sheets of the heating units connected in series have a thickness of 1.5mm to 3 mm.

The utility model discloses a PTC heater's beneficial effect is: at least two heating units comprising a metal radiator and a PTC heating sheet are connected in series, and the series connection is higher in compressive strength than the parallel connection under the same condition. The power of the PTC heater can be adjusted by replacing the PTC heating sheet so as to meet corresponding standards or meet corresponding requirements.

Drawings

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

Fig. 2 is a schematic structural diagram of a PTC heater according to a first embodiment of the present invention.

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

Fig. 4 is a schematic structural view of a PTC heater according to a third embodiment of the present invention.

Fig. 5 is a schematic structural view of a PTC heater according to a fourth embodiment of the present invention.

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

Fig. 7 is a schematic structural view of a PTC heater according to a sixth embodiment of the present invention.

Fig. 8 is a schematic structural view of a PTC heater according to a seventh embodiment of the present invention.

Fig. 9 is a schematic structural view of a PTC heater according to an eighth embodiment of the present invention.

Fig. 10 is a schematic structural view of a PTC heater according to a ninth embodiment of the present invention.

In the figure, 1, an outer press plate;

2. a corrugated fin;

3. an inner pressure plate;

4. a PTC heating sheet;

5. a wiring terminal;

6. a thermal circuit breaker.

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 invention.

Referring to fig. 2 to 10, a PTC heater of the present invention has a high withstand voltage, the PTC heater including:

a plurality of metal heat sinks;

PTC heating element, PTC heating element includes the PTC heating sheet of multi-disc interval distribution, PTC heating element glues between the adjacent metal radiator of series connection:

the wiring terminals are arranged on the metal radiator;

the PTC heating components are connected in series between adjacent metal radiators and between the adjacent metal radiators to form heating units, at least two heating units are connected in series, and the heating units are connected in series.

The utility model discloses a PTC heater, it includes the heating unit series connection of metal radiator and PTC heating plate, under the unchangeable condition of other conditions, can be revised as establishing ties parallelly connected through changing the mode of connection, and parallelly connected mode is compared in series connection, and compressive strength is higher. The power of the PTC heater can be adjusted by replacing the PTC heating sheet so as to meet corresponding standards or meet corresponding requirements.

Example one

Referring to fig. 2, a PTC heater with high withstand voltage according to a first embodiment of the present invention includes:

a plurality of metal heat sinks;

PTC heating element, PTC heating element includes that the PTC of multi-disc interval distribution generates heat piece 4, PTC heating element glues between the adjacent metal radiator of series connection:

the wiring terminals 5 are arranged on the metal radiator;

the PTC heating components are connected in series between adjacent metal radiators and connected in series between adjacent metal radiators to form three heating units, and the three heating units are connected in series.

In this embodiment, the connection terminal 5 may be a tab structure or a hoop structure, or may be another connection structure.

In this embodiment, the metal heat sink includes an outer pressing plate 1, an inner pressing plate 3, and corrugated fins 2 disposed between the outer pressing plate 1 and the inner pressing plate 3. Wherein, the outer pressing plate 1 is a flat plate, and the inner pressing plate 3 is a U-shaped plate.

In this embodiment, the heat generating units adjacent in series share the outer pressing plate 1. The heating units which are connected in series and adjacent share the inner pressing plate 3 of the outer pressing plate 1, and the processing and the assembly are easy.

In this embodiment, all the heating units are connected in series along the thickness direction of the PTC heating sheet 4, all the connecting terminals 5 are located at the same end of the PTC heater, and one of the connecting terminals 5 is further provided with a thermal circuit breaker 6. The connecting terminal 5 is positioned at the same end of the PTC heater, and the thermal circuit breaker 6 is arranged on one connecting terminal 5, so that a cross-connecting line and a terminal are eliminated, a live wire is shortened, and the cost is reduced.

In this embodiment, there are two connection terminals 5, and the thermal cut-off 6 is disposed on one of the connection terminals 5.

In this embodiment, only the exposed joint needs to be arranged on the outer pressing plate 1, and the wiring terminal 5 is arranged on the thermal circuit breaker 6, so that the thermal circuit breaker 6 can be installed on the outer pressing plate 1. Compare among the prior art, for the installation circuit breaker, need a both ends area binding post 5 to lead the cable, this embodiment has saved this lead wire.

In this embodiment, under the condition that the access voltage remains unchanged, the voltage on each heating unit is reduced after the connection in series, and the PTC heating sheet 4 can be replaced to maintain the heating power.

The PTC heater of the first embodiment of the utility model adopts three heating units connected in series, when the PTC heating sheet 4 adopts the PTC heating sheet 4 with the withstand voltage of 500V, the withstand voltage of the whole PTC heater is increased to 1500V; when the thickness of the PTC heating sheet 4 is reduced to 1.5mm, the withstand voltage can still be increased to 1050V (the withstand voltage value of the existing PTC heating sheet 4 with 220V and 2.5mm is 500V); the thermal breaker 6 moves to the side of the wiring terminal 5, the cross-connection (namely, a lead) and the wiring terminal 5 are omitted, the live wire is shortened, the structure is simplified, and the material cost and the labor cost are reduced.

Example two

The second embodiment is different from the first embodiment in the number of the connection terminals 5 and the arrangement of the thermal breakers 6.

Referring to fig. 3, in the present embodiment, there are three connection terminals 5, and the thermal cut-out 6 is provided on the middle connection terminal 5. The thermal cut-out 6 is arranged at the middle position rather than the outer end, so that the space between the two wiring terminals 5 can be utilized, and the whole PTC heater occupies less space.

In this embodiment, two heating units on the middle and right sides are connected in series and then connected in parallel with one heating unit on the left side. The withstand voltage of the heating units connected in series on the middle and the right side is increased. When the PTC heating sheet 4 of the heating unit on the left side is a PTC heating sheet 4 having a distance of 3mm or more, the withstand voltage of the entire PTC heater is increased.

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

EXAMPLE III

The third embodiment is different from the first embodiment in the number of heat generating units connected in series.

Referring to fig. 4, in the present embodiment, there are four heat generating units connected in series. When the existing 220V and 2.5mm PTC heating sheet 4 is still used, the voltage resistance value of the whole PTC heater is increased to 2000V; when the 220V, 1.5mm PTC heating sheet 4 is used, the voltage resistance of the whole PTC heater still rises to 1400V.

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

Example four

The fourth embodiment is different from the third embodiment in the number of the connection terminals 5 and the arrangement of the thermal breakers 6.

Referring to fig. 5, in the present embodiment, there are three connection terminals 5, and the thermal cut-out 6 is provided on the middle connection terminal 5. The heating device comprises a first heating unit, a second heating unit, a third heating unit and a fourth heating unit from left to right. Wherein the middle connection terminal 5 is arranged between the middle second and third heating elements.

In this embodiment, the first heat generating unit and the second heat generating unit are connected in series and then connected in parallel with the third heat generating unit and the fourth heat generating unit which are connected in series.

The other structures and effects of the fourth embodiment are the same as those of the third embodiment, and are not described herein.

EXAMPLE five

The fifth embodiment is different from the fourth embodiment in the arrangement of the thermal cut-off 6.

Referring to fig. 6, in the present embodiment, the intermediate connection terminal 5 is disposed between the first heat generating unit and the second heat generating unit. The first heating unit is connected with the second heating unit, the third heating unit and the fourth heating unit which are connected in series in parallel.

In this embodiment, the withstand voltage value of the second heat generating unit, the third heat generating unit, and the fourth heat generating unit after being connected in series is increased. When the PTC heat generating sheet 4 of the first heat generating unit is a PTC heat generating sheet 4 having a distance of 3mm or more, the withstand voltage of the entire PTC heater is increased.

The other structures and effects of the fifth embodiment are the same as those of the fourth embodiment, and are not described herein.

EXAMPLE six

The sixth embodiment is different from the first embodiment in the direction in which the heat generating units are connected in series and the number of the heat generating units.

Referring to fig. 7, in the present embodiment, there are two heat generating units. Two the heating unit establishes ties along length direction, binding post 5's quantity is two and is located the PTC heater both ends, still is equipped with thermal circuit breaker 6 on one of them binding post 5. The heating units are connected in series along the length direction, so that the shape different from the shape connected in series along the thickness direction is obtained, and the heating unit is suitable for different scenes.

In the present embodiment, the heat generating units adjacent in series share the outer platen 1, the inner platen 3, and the corrugated fins 2.

When in processing, a long metal radiator, a short metal radiator and a short metal radiator can be respectively manufactured, the PTC heating sheet 4 is glued between the two short radiators and the long radiator by using heat-conducting silica gel, and the two short metal radiators are spaced by a certain gap along the length direction. Two connection terminals 5 are provided on the outer pressing plates 1 of the two short metal heat sinks.

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

EXAMPLE seven

The seventh embodiment is different from the sixth embodiment in the number of heat generating units.

Referring to fig. 8, in the present embodiment, there are three heat generating units. The three heating units are connected in series along the length direction.

During manufacturing, two long metal radiators, two short metal radiators and four short metal radiators are manufactured respectively, and the short metal radiators, the long metal radiators and the short metal radiators are sequentially bonded with the PTC heating sheet 4 through the heat-conducting silica gel. A certain gap is arranged between the long metal radiator and the short metal radiator. Two connection terminals 5 are provided on the outer pressing plates 1 of the two short metal heat sinks.

The other structures and effects of the seventh embodiment are the same as those of the sixth embodiment, and are not described herein.

Example eight

The difference between the eighth embodiment and the seventh embodiment is the number of heat generating units.

Referring to fig. 9, in the present embodiment, there are four heat generating units. The four heating units are connected in series along the length direction.

During manufacturing, five metal radiators with three long parts and two short parts are manufactured respectively, and then the short metal radiator, the long metal radiator and the short metal radiator are sequentially glued with the PTC heating sheet 4 through the heat-conducting silica gel. A certain gap is arranged between the long metal radiator and the short metal radiator. Two connection terminals 5 are provided on the outer pressing plates 1 of the two short metal heat sinks.

The other structures and effects of the eighth embodiment are the same as those of the seventh embodiment, and are not described herein.

Example nine

The ninth embodiment is different from the first embodiment in the number of heat generating units and the connection manner between the heat generating units.

Referring to fig. 10, in the present embodiment, there are two heat generating units, and the two heat generating units are connected by a separate connecting member. The heating units are connected through the independent connecting pieces, the heating units can be connected in series when the heating device is used, and the single heating unit is small in size and convenient to package, transport and store.

In this embodiment, two terminals 5 are respectively disposed on the two heating units, and the two heating units are connected to each other by a wire with the terminals 5.

The other structures and effects of the ninth embodiment are the same as those of the first embodiment, and are not described herein.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention 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 invention is intended to be included within the scope of the following claims.

Claims

1. A high withstand voltage PTC heater characterized in that: the PTC heater includes:

a plurality of metal heat sinks;

the PTC heating plates (4) are connected in parallel, and the PTC heating plates (4) are glued between adjacent metal radiators:

the PTC heating elements (4) are connected in parallel between adjacent metal radiators to form heating units, and at least two heating units are connected in series.

2. A high withstand voltage PTC heater according to claim 1, wherein: the metal radiator comprises an outer pressing plate (1), an inner pressing plate (3) and corrugated radiating fins (2) arranged between the outer pressing plate (1) and the inner pressing plate (3), and a part of the outer pressing plate (1) and/or the part of the inner pressing plate (3) is provided with a connecting terminal (5).

3. A high withstand voltage PTC heater according to claim 2, wherein: the heating units which are adjacent in series share the outer pressing plate (1) and/or the inner pressing plate (3); or,

the heat generating units adjacent in series are connected in series by a separate connecting member.

4. A high withstand voltage PTC heater according to claim 1, wherein: all the heating units are connected in series along the thickness direction of the PTC heating sheet (4), the PTC heater further comprises a plurality of wiring terminals (5) arranged at the same end of the PTC heater in the length direction, and a thermal circuit breaker (6) is further arranged on each wiring terminal (5).

5. A high withstand voltage PTC heater according to claim 4, wherein: the heating units which are connected in series and adjacent share the outer pressing plate (1).

6. A high withstand voltage PTC heater according to claim 4, wherein: the number of the connecting terminals (5) is three, and the thermal circuit breaker (6) is arranged on the connecting terminal (5) in the middle; or,

the number of the wiring terminals (5) is two, and the thermal circuit breaker (6) is arranged on one of the wiring terminals (5).

7. A high withstand voltage PTC heater according to claim 1, wherein: a plurality of the heating unit establishes ties along length direction, the PTC heater still includes binding post (5), the quantity of binding post (5) is two and is located PTC heater length direction's both ends, still is equipped with thermal circuit breaker (6) on one of them binding post (5).

8. A high withstand voltage PTC heater according to claim 7, wherein: the heating units which are connected in series and adjacent share the outer pressing plate (1), the inner pressing plate (3) and the corrugated radiating fins (2).

9. A high withstand voltage PTC heater according to claim 1, wherein: the number of the heating units is two, and the two heating units are connected in series;

the number of the heating units is three, and the three heating units are connected in series; or,

three heating units are provided, wherein two heating units are connected in series and are connected with another heating unit in parallel; or,

the number of the heating units is four, and the four heating units are connected in series; or,

the number of the heating units is four, and the four heating units are connected in parallel after being connected in series; or,

the number of the heating units is four, and three heating units are connected in series and connected with another heating unit in parallel.

10. A high withstand voltage PTC heater according to claim 1, wherein: the thickness of the PTC heating sheet (4) of the heating units connected in series is between 1.5mm and 3 mm.