CN215453322U

CN215453322U - Improved structure of PTC heater

Info

Publication number: CN215453322U
Application number: CN202122358610.7U
Authority: CN
Inventors: 徐伟; 邵华; 费月英
Original assignee: Shanghai Pake Thermistor Ceramics Co ltd
Current assignee: Shanghai Pake Thermistor Ceramics Co ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2022-01-07
Anticipated expiration: 2031-09-28

Abstract

An improved structure of a PTC heater comprises a PTC heating sheet arranged in an aluminum pipe cavity, electrode plates are arranged on the upper side and the lower side of the PTC heating sheet, an insulating piece is wrapped on the periphery of the PTC heating sheet, the insulating piece is heat conduction insulating paper with heat conduction silica gel arranged on the upper side and the lower side, an overlapping area formed at a joint of the insulating piece only covers the middle part of the upper surface of the electrode plate, matched grooves are formed in the corresponding positions of the inner wall of the aluminum pipe and the overlapping area formed at the joint of the insulating piece, the problems that the overlapping area of the insulating piece covers the upper surface of the whole electrode plate to increase thermal resistance and cost are solved, the problems that when a common aluminum pipe is pressed, the stress of the overlapping area in the middle of the insulating piece is uneven, local stress is increased and thermal resistance is increased are solved, the heat conduction performance is effectively improved, and the beneficial effect of the power of the PTC heating sheet is fully exerted.

Description

Improved structure of PTC heater

Technical Field

The utility model relates to the field of physics, in particular to a PTC heating device, and specifically relates to an improved structure of a PTC heater.

Background

At present, an upper electrode plate and a lower electrode plate are respectively covered on the upper surface and the lower surface of a PTC heating sheet, the upper electrode plate and the lower electrode plate are wrapped by adopting a plurality of layers of common insulating paper, the common insulating paper is plugged into an aluminum pipe to be compressed, and finally corrugated heat dissipation strips are bonded on two surfaces of the aluminum pipe.

The improved PTC heater with high power density (patent publication No. CN 210781397U) adopts heat-conducting insulating paper with heat-conducting silica gel layers on the upper and lower surfaces as insulating cloth, the heat-conducting silica gel layer fully fills the air gap of the binding surface of the insulating paper, the heat-conducting property is effectively improved, and the power of the PTC heating sheet is fully exerted. But because the existence of heat conduction silica gel layer for the thickness of insulating cloth is thicker than ordinary insulating paper, has the overlap region after the insulating cloth parcel, behind parcel PTC heating plate and upper and lower electrode piece, the thickness of the overlap region department of insulating cloth can be protruding more, and PTC heating element pastes with the aluminum pipe inner wall and the atress is even when pressing the pipe for guaranteeing to press, needs the overlap region to cover whole electrode piece upper surface, so just can increase the cost when increasing the thermal resistance.

SUMMERY OF THE UTILITY MODEL

The utility model provides an improved structure of a PTC heater, which aims at overcoming the defects in the prior art, effectively improves the heat conducting performance, fully exerts the power of a PTC heating sheet and solves the problem of uneven stress of the PTC heating sheet.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an improvement structure of PTC heater, includes the cavity aluminum pipe as the casing be provided with the PTC heating plate in the aluminum pipe cavity, the upper and lower both sides of PTC heating plate all are provided with the electrode slice, the PTC heating plate with the periphery cladding of two electrode slice combinations has the insulating part, the insulating part all is provided with the heat conduction insulated paper of heat conduction silica gel for upper and lower two sides, a serial communication port, the insulating part is wrapping up the PTC heating plate with behind upper and lower electrode slice, the insulating part forms an overlap area in its joint department, the width in overlap area be less than the width of the electrode slice upper surface of PTC heating plate upside, overlap area cover the mid portion of electrode slice upper surface, be provided with the recess in the upside inner wall of aluminum pipe, recess and insulating part joint overlap area match.

Further, according to the improved structure of the PTC heater, the width of the groove is larger than or equal to the width of an overlapping area formed at the joint of the insulating piece.

Furthermore, the improved structure of the PTC heater is characterized in that bevel edge transition is arranged on two sides of the groove.

Compared with the prior art, the utility model has the advantages that the effect is positive and obvious, the overlapping area of the joint of the insulating part only covers the middle part of the upper surface of the electrode plate, the problems of increased thermal resistance and increased cost caused by the fact that the overlapping area of the insulating part covers the whole upper surface of the electrode plate are solved, the problem that the stress of the middle overlapping area of the insulating part is uneven when a common aluminum pipe is pressed is effectively improved and the thermal resistance is increased due to uneven stress of the middle overlapping area of the insulating part is solved by arranging the groove matched with the overlapping area of the insulating part on the inner wall of the aluminum pipe, the heat conducting performance is effectively improved, and the beneficial effect of fully exerting the power of the PTC heating plate is achieved.

Drawings

FIG. 1 is a block diagram of the present invention.

Fig. 2 is a structural view of an insulating member in the present invention.

FIG. 3 is a structural view of an aluminum pipe in the utility model.

Fig. 4 is a structural view of the present invention before compression.

Detailed Description

Example (b):

as shown in fig. 1, 2, 3 and 4, an improved structure of a PTC heater comprises a hollow aluminum tube 2 as a housing, a PTC heating sheet 1 is disposed in a cavity of the aluminum tube 2, electrode sheets 3 are disposed on both upper and lower sides of the PTC heating sheet 1, an insulating member 4 is wrapped around the combination of the PTC heating sheet 1 and the two electrode sheets 3, and the insulating member 4 is a heat-conducting insulating paper 6 having heat-conducting silica gel 7 disposed on both upper and lower surfaces thereof, wherein after the insulating member 4 wraps the PTC heating sheet 1 and the upper and lower electrode sheets 3, an overlapping region 8 formed at a joint of the insulating member 4 only covers a middle portion of an upper surface of the electrode sheet 3, a groove 5 matched with the overlapping region 8 is disposed at a position corresponding to the overlapping region 8 formed at a joint of the insulating member 4 on an inner wall of the aluminum tube 2, and the overlapping region 8 formed at a joint of the insulating member 4 only covers a middle portion of the upper surface of the electrode sheet 3, compared with the wrapping mode that the overlapping area of the insulating part 4 covers the upper surface of the whole electrode plate 3, the wrapping mode has the advantages that the thermal resistance rising amount caused by the increase of the thickness of the insulating part 4 is reduced, the cost is also reduced, in comparison with the graph shown in the figure 1 and the graph shown in the figure 4, the change of the PTC heating assemblies in the aluminum pipe before and after the pipe pressing is visible, the groove 5 is arranged on the inner wall of the aluminum pipe 2, the problem that the local stress is increased due to the fact that the extruding force of the inner wall of the aluminum pipe 2 is uneven in the area where the insulating part 4 is partially overlapped when the pipe is pressed is solved, so that the thermal resistance is increased, the PTC heating assemblies can be stably fixed in the aluminum pipe 2, looseness caused by the extrusion of external force or long-term expansion and contraction is not easy to cause, and the power attenuation of the PTC heater is reduced.

Further, as shown in fig. 3, in the improved structure of the PTC heater, the width of the groove 5 is greater than or equal to the width of the overlapping area 8 formed at the joint of the insulating member 4, so as to ensure that the insulating member 4 wrapped with the combination of the PTC heating sheet 1 and the electrode sheet 3 can be smoothly inserted into the aluminum tube 2 and can be well attached.

Further, PTC heater's improvement structure, recess 5 both sides set up the hypotenuse transition, further improve when pressing the pipe, the inhomogeneous problem of inside PTC heating plate 1 stress.

Claims

1. The utility model provides an improvement structure of PTC heater, includes the cavity aluminum pipe as the casing be provided with the PTC heating plate in the aluminum pipe cavity, the upper and lower both sides of PTC heating plate all are provided with the electrode slice, the PTC heating plate with the periphery cladding of two electrode slice combinations has the insulating part, the insulating part is the heat conduction insulated paper that upper and lower two sides all was provided with heat conduction silica gel, a serial communication port, the insulating part is wrapping up the PTC heating plate with the assembly of upper and lower electrode slice, the insulating part forms an overlap region in its joint department, the width in overlap region be less than the width of the electrode slice upper surface of PTC heating plate upside, overlap region cover the mid portion of electrode slice upper surface, be provided with the recess in the upside inner wall of aluminum pipe, recess and insulating part joint overlap region match.

2. An improved structure of a PTC heater according to claim 1, wherein the width of the groove is equal to or greater than the width of the overlapping area formed at the joint of the insulating member.

3. An improved PTC heater according to claim 1 or claim 2, wherein the recess is provided with bevelled transitions on either side.