CN215898040U

CN215898040U - Heat conduction metal tube structure of PTC heating tube

Info

Publication number: CN215898040U
Application number: CN202122465795.1U
Authority: CN
Inventors: 徐伟; 邵华; 冯卫; 徐刚
Original assignee: Shanghai Pake Thermistor Ceramics Co ltd
Current assignee: Shanghai Pake Thermistor Ceramics Co ltd
Priority date: 2021-10-13
Filing date: 2021-10-13
Publication date: 2022-02-22
Anticipated expiration: 2031-10-13

Abstract

The utility model provides a heat conduction metal tube structure of PTC heating pipe, includes the body of flat hollow structure, and the body comprises left and right sides and upper and lower side, and the cross section of body is similar rectangle frame construction, and upper and lower side is the interior concave surface that has certain radian, and the height that highly is slightly greater than the height of middle part at body cross section both ends. This PTC heating pipe passes through the interior concave surface structure of side about the tubular metal resonator, make PTC heating pipe press the pipe manufacturing process, utilize interior concave surface to be pressed into planar structure after can try to resume concave shape, thereby produce inside concave surface internal stress on the interior concave surface of upper and lower side of tubular metal resonator, the deformation of resisting PTC heating pipe expend with heat and contract with cold and produce has been increased, effectively improved the problem that the PTC heating pipe thermal resistance that arouses because of the tubular metal resonator pressure attenuation increases, the power attenuation that has reduced the PTC heating pipe has been reached, increase of service life's effect.

Description

Heat conduction metal tube structure of PTC heating tube

Technical Field

The utility model relates to the field of electricity, in particular to an electric heating element technology, and specifically relates to a heat-conducting metal tube structure of a PTC heating tube.

Background

The PTC heating pipe with the traditional flat pipe structure is generally characterized in that the upper surface and the lower surface of PTC heating ceramic are respectively covered with electrode plates, insulating layers are used for wrapping, the whole PTC heating pipe is plugged into an inner cavity of a flat metal pipe, and the PTC heating pipe is manufactured by applying certain pressure to the upper plane and the lower plane of the flat metal pipe and pressing the flat metal pipe. After the flat metal pipe is compressed, the side edge of the metal pipe deforms under the action of external pressure, and after the external pressure is removed, the flat metal pipe maintains the compressed state of the metal pipe through the pressing force existing after the side edge deforms, so that a certain pressure is kept between the plane of the flat metal pipe and the PTC heating ceramic surface, and heat conduction is realized.

After the PTC heating pipe works, due to the phenomenon that materials expand with heat and contract with cold, different materials have different thermal expansion coefficients, so that the expansion degrees of different materials are different, the pressing force between the middle part of the metal pipe and the PTC heating ceramic is reduced, the pressing force is reduced, the thermal resistance is increased, the power of the PTC thermal sensitive ceramic cannot be released, the power of the PTC heating pipe is attenuated, and the service life is shortened.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provides a heat-conducting metal tube structure of a PTC heating tube, wherein the inner concave surface structures of the upper side surface and the lower side surface of the metal tube are utilized to try to recover the inner concave shape after the inner concave surfaces are pressed into a plane structure in the manufacturing process of the PTC heating tube, so that the inner concave surface internal stress is generated on the inner concave surfaces of the upper side surface and the lower side surface of the metal tube, the deformation generated by the expansion caused by heat and the contraction caused by cold of the PTC heating tube is increased, the problem of the increase of the thermal resistance of the PTC heating tube caused by the attenuation of the compression force of the metal tube is effectively solved, the power attenuation of the PTC heating tube is reduced, and the service life is prolonged.

The heat-conducting metal tube structure of the PTC heating tube comprises a tube body with a flat hollow structure, wherein the tube body is composed of a left side surface, a right side surface, an upper side surface and a lower side surface, the cross section of the tube body is of a similar rectangular frame structure, the upper side surface and the lower side surface are inner concave surfaces with certain radian, and the heights of two ends of the cross section of the tube body are slightly larger than the thickness of the middle part.

Furthermore, the upper side surface and the lower side surface are concave surfaces in arc structures.

Furthermore, the left side surface and the right side surface are of a convex surface structure or a concave surface structure.

Further, the pipe body is made of aluminum alloy material.

The working principle of the utility model is as follows: on the basis of the PTC heating pipe with the traditional flat pipe structure, the upper side and the lower side of the flat metal pipe are changed into an inner concave surface structure from a plane structure, the PTC heating pipe after the pipe is pressed and the PTC heating pipe with the traditional flat pipe structure, the pressed pressure of the metal pipe is the same, but the inner concave surface structure of the metal pipe is pressed into the plane structure, the pressed inner concave surface structure tries to recover to the original inner concave shape, thereby on the upper side and the lower side of the inner concave surface flat metal pipe, an inward additional internal stress is respectively generated, the generation of the internal concave surface internal stress is realized, the deformation of the inner concave surface flat metal pipe for resisting the expansion and contraction is increased, and the increase of thermal resistance caused by the attenuation of the pressure of the metal pipe is improved.

Compared with the prior art, the utility model has positive and obvious effect. According to the utility model, through the inner concave surface structures on the upper side and the lower side of the metal pipe, in the manufacturing process of the PTC heating pipe, the inner concave surfaces are pressed into a plane structure and then try to recover the inner concave shape, so that inward concave surface internal stress is generated on the inner concave surfaces on the upper side and the lower side of the metal pipe, the deformation generated by thermal expansion and contraction of the PTC heating pipe is increased, the problem of thermal resistance increase of the PTC heating pipe caused by the attenuation of the compression force of the metal pipe is solved, and the effects of reducing the power attenuation of the PTC heating pipe and prolonging the service life are achieved.

Drawings

Fig. 1 is a schematic view of the overall structure of the metal pipe of the present invention.

Fig. 2 is a schematic view of the structure of the PTC heating tube of the present invention.

Fig. 3 is a schematic view of the pressing force of a conventional PTC heating tube of a flat tube structure.

Fig. 4 is a schematic view of the PTC heating tube pressing force of the present invention.

Detailed Description

Example 1:

as shown in fig. 1 and 2, the heat conducting metal tube structure of the PTC heating tube of the present invention includes a tube body 1 having a flat hollow structure, wherein the tube body 1 includes a left side surface 101, a right side surface 101, and an upper side surface 102 and a lower side surface 102, the cross section of the tube body 1 is a rectangular frame-like structure, the upper side surface 102 and the lower side surface 102 are concave surfaces 2 having a certain radian, and the height B of both ends of the cross section of the tube body 1 is slightly larger than the height a of the middle portion.

Further, the upper and lower side surfaces 102 are concave surfaces 2 in an arc structure.

Further, the left and right sides 101 are convex or concave.

Further, the pipe body 1 is made of aluminum alloy material.

As shown in fig. 4, the preparation process of the present invention is: the upper surface and the lower surface of the PTC heating ceramic 5 are respectively covered with the electrode plates 4, wrapped by the insulating layers 3 and then integrally plugged into the inner cavity of the tube body 1, and the upper side surface and the lower side surface 102 of the tube body 1 are pressed to be manufactured into the PTC heating tube with the structure of the concave surface 2 with a certain radian. Compared with the conventional flat tube structured PTC heating tube (as shown in FIG. 3), the PTC heating tube with the concave surface structure removes the metal tube compression force F₁Besides, due to the structural characteristics of the concave surface 2, the internal stress F of the concave surface also exists₂。

Claims

1. The utility model provides a heat conduction metal tube structure of PTC heating pipe, includes the body of flat hollow structure, its characterized in that: the pipe body comprises left and right sides and upper and lower side, the cross section of pipe body is similar rectangle frame structure, upper and lower side be the interior concave surface, the height at pipe body cross section both ends slightly is greater than the thickness of middle part.

2. A heat-conductive metal tube structure of a PTC heating tube according to claim 1, wherein: the upper side surface and the lower side surface are concave surfaces in arc structures.

3. A heat-conductive metal tube structure of a PTC heating tube according to claim 1, wherein: the left side surface and the right side surface are of convex or concave structures.

4. A heat-conductive metal tube structure of a PTC heating tube according to claim 1, wherein: the pipe body is made of aluminum alloy material.