CN211606837U

CN211606837U - Heating pipe used in vacuum chamber

Info

Publication number: CN211606837U
Application number: CN202020639418.8U
Authority: CN
Inventors: 聂毅东; 朱刚; 吴立南
Original assignee: Nanjing Langshiyi Plasma Manufacturing Technology Co ltd
Current assignee: Nanjing Langshiyi Plasma Manufacturing Technology Co ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2020-09-29
Anticipated expiration: 2030-04-24

Abstract

The utility model discloses an indoor heating pipe that uses of vacuum chamber, including the heating wire, the metal outer tube, draw forth stick and stopping, the heating wire is arranged in the metal outer tube, the stick is drawn forth in the connection of the both ends of heating wire, it stretches out from metal outer tube both ends to draw forth the stick, the metal outer tube intussuseption is filled with the stopping, heating wire and stopping constitution generate heat transfer part, the ceramic fiber end cap is installed at the both ends of metal outer tube, open at the center of ceramic fiber end cap and draw forth the stick and portal, the ceramic fiber end cap is used for encapsulating intraductal stopping, set up one deck silicone rubber pad in the ceramic fiber end cap, there is fabulous leakproofness, it is durable, the ceramic fiber end cap with. The ceramic fiber plug is matched and attached with the metal outer sleeve, the filler in the sleeve can be sealed in the plug under the vacuum condition, the ceramic fiber plug can resist cold and hot impact, the ceramic fiber plug is heated to more than 1000 ℃ in the air, and the ceramic fiber plug is rapidly cooled and then rapidly heated without being cracked.

Description

Heating pipe used in vacuum chamber

Technical Field

The utility model relates to a heating pipe, concretely relates to heating pipe for in vacuum chamber.

Background

The workpiece to be heated is placed in the vacuum chamber, and the common heating mode is as follows: the left and right sides oven heats in the vacuum chamber, the work piece of treating the heating is in vacuum chamber's center, in the heating process, need use the heating pipe, owing to heat under vacuum environment, can appear after using a period of time heating unstability, the electrothermal tube breaks, the emergence of electric leakage scheduling problem appears, the reason is under vacuum environment, filler or working gas in the heating pipe can be washed out, the effect of filler is in order not to let resistance wire and pipe wall touch, on the other hand is for the transmission of heat, so will solve the problem of intraductal material shutoff.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a heating pipe is used in difficult cracked vacuum chamber.

The utility model provides a following technical scheme:

the heating pipe for the vacuum chamber comprises a heating wire, a metal outer sleeve, a leading-out rod and fillers, wherein the heating wire is arranged in the metal outer sleeve, the leading-out rod is connected to two ends of the heating wire, the leading-out rod extends out of two ends of the metal outer sleeve, the fillers are filled in the metal outer sleeve, the heating wire and the fillers form a heating heat transfer part, ceramic fiber plugs are installed at two ends of the metal outer sleeve, a leading-out rod outlet is formed in the center of each ceramic fiber plug and used for packaging the fillers in the vacuum chamber, a layer of silicone rubber pad is arranged in each ceramic fiber plug, the ceramic fiber plugs and the leading-out rod form a non-heating part, and the end parts of the leading-out rods are.

Furthermore, the two ends of the metal outer sleeve are provided with external threads, one end of the ceramic fiber plug is provided with an annular groove, the peripheral wall of the annular groove is provided with internal threads, and the external threads are screwed and matched with the internal threads.

Furthermore, the silicone rubber pad is placed in the annular groove, and the position of a center hole of the silicone rubber pad is consistent with that of a leading-out rod outlet hole of the ceramic fiber plug.

Furthermore, a plurality of pressure reduction grooves are formed in the silicone rubber pad.

Further, the filler is crystalline magnesium oxide.

Furthermore, the metal outer sleeve is a stainless steel pipe.

Furthermore, the electric heating wire is a nickel-chromium wire.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses an indoor heating pipe that uses of vacuum includes heating wire, metal outer tube, draws forth stick and stopping, and ceramic fiber end cap and metal outer tube cooperation laminating, under vacuum condition, intraductal stopping can seal in the end cap, and the ceramic fiber end cap can resist cold and hot impact, heats more than 1000 ℃ in the air, and sharp cooling sharply heats again, also can not cracked. Heating in a vacuum environment is ensured, and phenomena of unstable heating and rupture of the tube shell of the electric heating tube can be avoided.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the installation position of the ceramic fiber plug of the present invention.

Fig. 3 is a schematic structural view of the silicone rubber pad of the present invention.

In the figure: 1. an electric heating wire; 2. a metal outer sleeve 21, external threads; 3. leading out a rod; 4. a filler; 5. a ceramic fiber plug 51, a ring groove 52 and an internal thread; 6. leading out a rod outlet; 7. a silicone rubber pad; 8. a copper bar joint; 9. a pressure relief tank.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, the heating tube for use in a vacuum chamber of the present invention includes a heating wire 1, a metal outer tube 2, a leading-out rod 3 and a filler 4, the heating wire 1 is disposed in the metal outer tube 2, the leading-out rod 3 is connected to two ends of the heating wire 1, the leading-out rod 3 extends out from two ends of the metal outer tube 2, the filler 4 is filled in the metal outer tube 2, the heating wire 1 and the filler 4 form a heat-generating and heat-conducting portion, ceramic fiber plugs 5 are mounted at two ends of the metal outer tube 2, a leading-out rod outlet 6 is opened at the center of the ceramic fiber plugs 5, the ceramic fiber plugs 5 are used for packaging the filler 4 in the tube, a silicone rubber pad 7 is disposed in the ceramic fiber plugs 5, the sealing performance is excellent, the heating tube is durable, the ceramic fiber plugs 5 and the leading-. The ceramic fiber plug 5 is tightly packaged, the sealing tube is filled with filler, the ceramic package can also be insulated, and the copper rod connector is conductive.

The metal outer sleeve 2 is provided with external threads 21 at two ends, one end of the ceramic fiber plug 5 is provided with a ring groove 51, the circumferential wall of the ring groove 51 is provided with internal threads 52, and the external threads 21 are in screwed fit with the internal threads 52. The ceramic fiber plug 5 and the metal outer sleeve 2 can be in threaded connection to plug the pipe orifice.

The silicone rubber pad 7 is placed in the annular groove 51, and the position of the central hole of the silicone rubber pad 7 is consistent with that of the outlet hole of the leading-out rod of the ceramic fiber plug 5. Silicone rubber gasket 7 can further seal the spout.

As shown in fig. 3, the silicone rubber pad 7 is provided with a plurality of pressure relief grooves 9. The buffer effect is good, can bear the hot gas flow.

The filler 4 is crystalline magnesium oxide.

The metal outer sleeve 2 is a stainless steel pipe. Preventing the interior from rusting.

The electric heating wire 1 is made of nickel chromium wire. For stainless steel tubing, which is longer than the tube, it is necessary to anneal at a high temperature of 900 c before bending, so the heating wire is a nichrome wire, which is reduced by magnesium oxide powder, i.e. at a much higher temperature, because of the lower affinity of chromium and oxygen, and the lower affinity of nickel and oxygen.

The ceramic fiber plug 5 has lubricity, is wear-resistant, and is resistant to oxidation at high temperatures. The ceramic fiber plug 5 is matched and attached with the metal outer sleeve 2, the filler in the pipe can be sealed in the plug under the vacuum condition, the ceramic fiber plug can resist cold and hot impact, the ceramic fiber plug is heated to more than 1000 ℃ in the air, and the ceramic fiber plug is rapidly cooled and then rapidly heated without being cracked. Heating in a vacuum environment is ensured, and phenomena of unstable heating and rupture of the tube shell of the electric heating tube can be avoided.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Heating pipe for use in vacuum chamber, its characterized in that: the electric heating wire is arranged in the metal outer sleeve, the two ends of the electric heating wire are connected with the leading-out rods, the leading-out rods extend out of the two ends of the metal outer sleeve, the filler is filled in the metal outer sleeve, the electric heating wire and the filler form a heating and heat transfer part, ceramic fiber plugs are mounted at the two ends of the metal outer sleeve, a leading-out rod outlet is formed in the center of each ceramic fiber plug and used for packaging the filler in the tube, a layer of silicone rubber pad is arranged in each ceramic fiber plug, the ceramic fiber plugs and the leading-out rods form a non-heating part, and the end parts of the leading-out rods are connected with copper rod connectors outside the tube.

2. The heating pipe for use in a vacuum chamber according to claim 1, wherein: the metal outer sleeve is provided with external threads at two ends, an annular groove is formed at one end of the ceramic fiber plug, an internal thread is formed on the peripheral wall of the annular groove, and the external threads are screwed and matched with the internal thread.

3. The heating pipe for use in a vacuum chamber according to claim 2, wherein: the silicone rubber pad is placed in the annular groove, and the position of a center hole of the silicone rubber pad is consistent with that of a leading-out rod outlet hole of the ceramic fiber plug.

4. The heating pipe for use in a vacuum chamber according to claim 1, wherein: and a plurality of pressure reduction grooves are formed in the silicone rubber pad.

5. The heating pipe for use in a vacuum chamber according to claim 1, wherein: the filler is crystalline magnesium oxide.

6. The heating pipe for use in a vacuum chamber according to claim 1, wherein: the metal outer sleeve is a stainless steel pipe.

7. The heating pipe for use in a vacuum chamber according to claim 1, wherein: the electric heating wire is made of nickel-chromium wire.