CN210247087U

CN210247087U - Light and thin brazing type PTC heater

Info

Publication number: CN210247087U
Application number: CN201921167573.8U
Authority: CN
Inventors: Guojian Xu; 许国建
Original assignee: Yang Zhou Enterex Auto Parts Industrial Co ltd
Current assignee: Yang Zhou Enterex Auto Parts Industrial Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-04-03
Anticipated expiration: 2029-07-23

Abstract

Light and thin type soldering PTC heater. Relate to the PTC heat exchanger field, especially relate to and carry out lightweight improvement by PTC radiator structure. Provided is a light and thin type soldering type PTC heater which can realize light weight of products and can ensure yield. The heating tube is characterized in that two sides of the top surface and/or the bottom surface of the heating tube are respectively provided with a pressurizing platform; two side surfaces of the heating tube are concave or convex. The utility model discloses ensured fixed effect, ensured heat-conducting efficiency. The fin plate does not need to bear the gluing pressure, so that the fin plate can be processed by adopting a thinner plate; finally, the PTC heater with high thermal efficiency and light weight is formed.

Description

Light and thin brazing type PTC heater

Technical Field

The utility model relates to a PTC heat exchanger field especially relates to and carries out lightweight improvement by PTC radiator structure.

Background

At present, the PTC heating element has been rapidly developed as a new type heating element and is replacing the traditional electric heating element, and the heater composed of the PTC heating element and metal is widely applied to air conditioners, hot air curtains, warm air blowers, bath heaters, clothes dryers, automobiles and other devices which need to provide warm air. The present heater composed of PTC heating element and metal is composed of one or more heating tubes and metal radiator which are used in parallel, wherein the metal radiator is formed by bonding an aluminum tube and an aluminum fin by high temperature resistant glue, before bonding, the strip PTC heating element and metal electrode are wrapped into a single heating core by an insulating film, the heating core is inserted into the aluminum tube, and the tube cavity is pressed down by a press (firstly for the purpose of heat exchange, and secondly for the purpose of positioning the PTC heating element).

Finally, the heating tube containing the PTC heating element and the aluminum fin are bonded together by high-temperature glue under the condition of pressurization to form a whole.

CN207638910U announced by the national intellectual property office 2018-7-20, name: a window type PTC heater with heat radiating fins is provided, which improves the structure of a radiator for the purpose of further improving the heat radiating effect. And it is mentioned that "the crests and troughs of the heat radiating fins on which a plurality of windows are opened are connected to the aluminum heating pipe by brazing or gluing. "although this case mentions that the flat heat generating tube and the heat dissipating fin can be connected by brazing and gluing, in the course of practical tests, we found that: firstly, the prior art has a common premise that the PTC heating element needs to be pre-installed in the metal heating tube;

then, if gluing is used, mechanical pressing is inevitably required, which requires the fins to be made of a thicker material (otherwise, the fins are not strong enough, and under the mechanical pressing, the whole body deforms or even collapses). The finished product manufactured by the method has large quality and high cost; in addition, the glue itself has a low thermal conductivity and a low thermal conductivity efficiency.

If the brazing method is adopted, the insulating film wrapped on the PTC heating core can not bear the temperature of the brazing process (the melting point of the aluminum solder is 577 ℃, and the insulating film wrapped on the heating core can only bear the temperature below 200 ℃). However, the PTC heating element does not need to use a film, and it is difficult to obtain a film which can withstand the brazing temperature at a conventional cost in the prior art. Therefore, the brazing only can melt and fail the existing film, and the product is scrapped.

In other words, when a product is manufactured according to the prior art, it is difficult to reduce the weight and to manufacture a qualified product. The brazing in the prior art cannot achieve the purpose of industrial production.

Disclosure of Invention

The utility model provides a to above problem, provide one kind and enable the product and realize the lightweight, and can guarantee the frivolous type brazing type PTC heating element of yield.

The technical scheme of the utility model is that: the heating tube is characterized in that two sides of the top surface and/or the bottom surface of the heating tube are respectively provided with a pressurizing platform; two side surfaces of the heating tube are concave or convex.

And the inner side of the pressurizing platform is also provided with a yielding groove.

The height and width of the inner cavity of the heating tube are larger than the thickness and width of the PTC heating core.

The table surface of the pressurizing platform is higher than or equal to the height of the top surface or the bottom surface of the heating tube.

The thickness of the radiating fin is 0.025-1.0 mm.

The peak points/valleys of the radiating fins are connected with the upper/lower heating tubes in a brazing mode.

And spacers are arranged between adjacent radiating fins, and the peaks/valleys of the radiating fins are connected with the spacers in a brazing manner.

The utility model discloses in the design theory, change PTC heat-generating body into the post installation by installing in advance. According to the structure of the utility model, the heat dissipation fin plate, the hollow heating tube, the spacer and the side plate are brazed and connected to form a frame-shaped whole; then, the PTC heating core is inserted into the hollow heating tube under the condition of clearance fit; and finally, pressurizing by utilizing pressurizing platforms at two sides of the top/bottom surface of the heating tube to force the heating tube to be plastically deformed, so that the top surface and the bottom surface of the inner cavity of the heating tube are attached to the top surface and the bottom surface of the PTC heating core, thereby ensuring the fixing effect and ensuring the heat conduction efficiency. The structural improvement leads to the change of the process, so that the fin plate does not need to bear the gluing pressure, and the fin plate can be processed by adopting a thinner plate; finally, the PTC heater with high thermal efficiency and light weight is formed.

Drawings

Figure 1 is a schematic structural view of the present invention,

figure 2 is a left side view of figure 1,

figure 3 is a schematic view of the process of the present invention,

FIG. 4 is a first schematic structural view of a heating tube of the present invention,

FIG. 5 is a schematic structural view II of the heating tube of the present invention,

figure 6 is a schematic structural diagram of the middle fin plate of the present invention,

FIG. 7 is a schematic view of the window seam on the heat dissipating fin of the present invention,

in the figure: 1 is a heating tube, 11 is a pressurizing platform, 12 is a yielding groove, 13 is a concave groove, 14 is a convex circle,

2 are heat radiating fins, 21 are peaks, 22 are slits, 23 are insulating films,

3 is a spacer, which is a spacer,

4 is a side plate, and the side plate is provided with a plurality of side plates,

5 is a PTC heating core which is provided with a heat-insulating layer,

and 6 is solder.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present application, the following will further describe a thin and light brazed PTC heater with reference to fig. 1-7.

The utility model discloses an including heating tube 1, sideboard 4 and radiating fin 2, be provided with PTC heating core 5 at heating tube 1 internal fixation, heating tube 1 is flat tubulose, the both sides position of 1 top surface of heating tube and/or bottom surface is equipped with pressurization platform 11 respectively, and the both sides face design of heating tube 1 has the indent 13 of interior concavity or the bulge's bulge 14, has still seted up in pressurization platform 11 inboard and has subsided ditch 12. In the actual manufacturing process, better plastic deformation is realized when the heating tube cavity is pressed down and pressurized by a pressing machine die. And the outer surface of the PTC heating element in the metal heating tube 1 can be tightly attached to the inner surface of the heating tube 1, so that the fixing and positioning effects are ensured, the heat conduction efficiency is ensured, and the heat transfer efficiency is higher. In addition, when the pressing platform 11 is covered by the heat radiating fins 2, the pressing can be performed through the grooves 13.

The height and width of the inner cavity of the heating tube 1 are larger than the thickness and width of the PTC heating core 5.

The top surface of the pressurizing platform 11 is higher than or equal to the height of the top surface or the bottom surface of the heating tube 1.

The thickness of the radiating fins 2 is 0.025-1.0 mm, and more fins can be arranged in a limited space due to the thin fins, so that the heat exchange area is increased, the heat conduction capability is improved, and the light and thin brazing type PTC heater can achieve high heat transfer efficiency.

The peaks 21/valleys of the heat radiating fins 2 are soldered to the upper/lower stages of the heat generating tube 1 by the solder 6.

Spacers 3 are provided between adjacent fins 2, and the peaks 21/valleys of the fins 2 are soldered to the spacers 3 by solder 6 (the solder 6 may be directly plated on the surface of the fins in general, or may be directly coated in the case where the fins are not plated with solder).

Set up intensive window seam 22 on radiating fin 2, the seam is apart from can being less than 3mm, can so make the utility model discloses a heat dispersion promotes greatly.

The process flow of the utility model is as follows: firstly, brazing and connecting the radiating fins 2, the hollow heating tube 1, the spacers 3 and the side plates 4 to form a frame-shaped whole; then, the PTC heating core 5 is extended into the hollow heating tube 1, and the after-loading process is adopted, so that the insulating film 23 can be prevented from being damaged at high temperature; finally, a pressing machine mold is used for pressing by utilizing the pressing platforms 11 at two sides of the top/bottom surface of the heating tube 1, so that the heating tube is forced to be plastically deformed, and the top surface and the bottom surface of the inner cavity of the heating tube 1 are tightly attached to the top surface and the bottom surface of the PTC heating core 5.

The utility model discloses the defect to prior art has carried out the innovation. The PTC radiator part is changed from adhesive bonding to welding, and from first pressing and then adhering to first welding and then pressing, so that the strength and reliability of the product are greatly improved, and the quality of the product is improved. More importantly, the welding can adopt the thin fins with dense slits for high-efficiency heat transfer as heat transfer elements, so that the miniaturization and the light weight of products are possible. Thereby greatly reducing the cost of the product. We have successfully used a welding process to reduce the amount of aluminum from about 900 to about 295 grams in the bonded form in developing a 2500W PTC product for automotive air conditioners. Each product can save about 600 grams of aluminum material and has a value of about 12 yuan. The material consumption is reduced by 66%, and the reduction amplitude is large.

The disclosure of the present application also includes the following points:

(1) the drawings of the embodiments disclosed herein only relate to the structures related to the embodiments disclosed herein, and other structures can refer to general designs;

(2) in case of conflict, the embodiments and features of the embodiments disclosed in this application can be combined with each other to arrive at new embodiments;

the above embodiments are only embodiments disclosed in the present disclosure, but the scope of the disclosure is not limited thereto, and the scope of the disclosure should be determined by the scope of the claims.

Claims

1. The light and thin brazing type PTC heater comprises a heating tube (1), side plates (4) and radiating fins (2), wherein a PTC heating core (5) is fixedly arranged in the heating tube (1), the heating tube (1) is in a flat tubular shape, and the light and thin brazing type PTC heater is characterized in that two sides of the top surface and/or the bottom surface of the heating tube (1) are/is respectively provided with a pressurizing platform (11); two side surfaces of the heating tube (1) are concave or convex.

2. The thin and light-weight brazed PTC heater according to claim 1, wherein a relief groove (12) is further formed inside the pressurizing platform (11).

3. A thin and light brazed PTC heater according to claim 1, wherein the height and width dimensions of the inner cavity of the heat generating tube (1) are larger than the thickness and width of the PTC heat generating core (5).

4. The thin and thin brazed PTC heater according to claim 1, wherein the pressing platform (11) has a mesa height higher than or equal to the height of the top or bottom surface of the heat generating tube (1).

5. The thin and lightweight brazed PTC heater according to claim 1, wherein the heat dissipating fins have a thickness of 0.025 to 1.0 mm.

6. The thin and lightweight brazed PTC heater according to claim 1, wherein the peaks/valleys of the heat radiating fins are brazed to the upper/lower heat generating tubes.

7. A light and thin type brazed PTC heater according to claim 1, wherein spacers (3) are provided between adjacent heat dissipating fins, and the peaks/valleys of the heat dissipating fins are brazed to the spacers.