CN216246854U

CN216246854U - Silicon nitride thermocouple protection tube

Info

Publication number: CN216246854U
Application number: CN202122565277.7U
Authority: CN
Inventors: 刘鹏; 么传波; 李旭科
Original assignee: Lianyungang Gongkey Material Technology Co ltd
Current assignee: Lianyungang Gongkey Material Technology Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-04-08
Anticipated expiration: 2031-10-25

Abstract

The utility model provides a silicon nitride thermocouple protection tube, belongs to temperature measurement sensor technical field, including inner tube and outer tube, its characterized in that, the inside a set of spacing collar that is equipped with of inner tube is equipped with a set of back shaft in the spacing collar, and spacing collar center department is equipped with silicon nitride thermocouple through-hole two, and the inside bottom of inner tube is equipped with insulation support, is equipped with the helicoidal in the insulation support, is equipped with a set of strengthening rib on the inner tube, a set of strengthening rib and outer tube fixed connection, is equipped with the buffering filler between outer tube and the inner tube. The problems that the existing silicon nitride thermocouple protection tube is poor in pressure resistance effect and heat conduction effect and a thermocouple is easy to fall off from the silicon nitride thermocouple protection tube are solved, and the silicon nitride thermocouple protection tube is mainly used for protecting tubes.

Description

Silicon nitride thermocouple protection tube

Technical Field

The utility model relates to the technical field of temperature measurement sensors, in particular to a silicon nitride thermocouple protection tube.

Background

The thermocouple is the most widely used temperature measuring sensor, and various performance indexes of the thermocouple such as long-term stability, service life and the like are closely related to the protection tube. The silicon nitride ceramic protection tube is matched with the thermocouple for use, plays a role in protecting the thermocouple, enables the thermocouple to work normally in a special environment, can prevent corrosion and the like. The thermocouple is a common temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument (a secondary instrument), the appearances of various thermocouples are usually different greatly according to requirements, but the basic structures of the various thermocouples are basically the same and generally comprise a thermode, an insulating sleeve protection tube, a junction box and other main parts, and the thermocouple is usually matched with a display instrument, a recording instrument and an electronic regulator for use.

Although the traditional silicon nitride thermocouple protection tube has the functions of heat resistance, corrosion resistance and the like, the traditional silicon nitride thermocouple protection tube also has ceramic brittleness, cracks or breakage easily occur in a high-pressure environment, the existing silicon nitride protection tube is often unstable in structure and easy to damage, although some structural changes are made, the heat conduction performance is deficient, high-temperature-resistant materials are mostly adopted to fill between a market thermocouple and the protection tube, and the space structure of a filler is easy to deform for a long time to enable the thermocouple and the protection tube to fall off.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems mentioned in the background art, the utility model provides a silicon nitride thermocouple protection tube, which adopts the following technical scheme:

a silicon nitride thermocouple protection tube comprises an inner tube and an outer tube, and is characterized in that: the inner tube is internally provided with a group of limiting rings which further play a role in limiting and stabilizing the inner tube and are used as a supporting structure of a reinforcing rib, a group of supporting shafts are arranged in the limiting rings and have supporting force for the limiting rings and the inner space structure of the inner tube, the pressure extrusion in a high-pressure furnace can be well borne, the pressure resistance of the whole protection tube is enhanced, the center of each limiting ring is provided with a silicon nitride thermocouple through hole II, the diameter of each through hole II is the same as that of a thermocouple, the thermocouple can be clamped and penetrated, meanwhile, the limiting rings are made of silicon nitride materials, the high temperature resistance is realized, the heat conduction to the thermocouple can be enhanced, the bottom inside the inner tube is provided with an insulating sleeve, the insulating sleeve is made of insulating materials, and the thermocouple is made of stainless steel materials and has certain electrical conductivity, so that the damage to a human body during maintenance or replacement of the inner tube is avoided, the insulating sleeve is internally provided with a helicoidal ring which can be in threaded connection with the bottom of the thermocouple to finally fix the thermocouple, so that the thermocouple is prevented from falling off from the protective tube for a long time, meanwhile, the insulating sleeve is also made of silicon nitride materials, the heat conducting property of the thermocouple is also enhanced, the inner tube is provided with a group of reinforcing ribs which internally play a role in reinforcing the internal structure, so that the pressure resistance of the internal structure is increased, the group of reinforcing ribs is fixedly connected with the outer tube, the double-layer structure prevents the outer tube from being damaged due to skin, the inner tube can continuously work, the production accident caused by temperature measuring fault is avoided, a buffer filler is arranged between the outer tube and the inner tube, the buffer filler is magnesium oxide powder which has ultrahigh heat resistance and heat conducting property, is an excellent heat conducting material and is a fine powder structure, so that the inner space of the outer tube and the inner tube is easily filled, meanwhile, countless powder particles can decompose and bear part of the pressure in the high-pressure furnace.

Preferably: inner tube upper portion be equipped with fixing device, fixing device include base, spacing fixed plate and silicon nitride thermocouple through-hole one, base and inner tube fixed connection, the base is firstly firm to the inner tube, secondly passes through bolt threaded connection with the high-pressure furnace, plays the fixed action to whole silicon carbide thermocouple protection tube and high-pressure furnace, the base on be equipped with spacing fixed plate, spacing fixed plate is stainless steel, exposes at the surface of high-pressure furnace, more does benefit to the structure and moulds, cramps spacingly to the thermocouple, prevents simultaneously rustting, increase of service life, spacing fixed plate in be equipped with silicon nitride thermocouple through-hole one, silicon nitride thermocouple through-hole one is the same with thermocouple diameter size, can wear into when making things convenient for the thermocouple to install to play spacing firm effect to the thermocouple, spacing fixed plate and inner tube fixed connection.

Preferably: the limiting fixing plate is made of stainless steel, can be better stabilized through hooping, and has a limiting effect on the thermocouple.

Preferably: the buffering filler is made of magnesium oxide powder, the magnesium oxide powder can resist the high temperature of 2800 ℃, the heat conducting performance is excellent, the buffering filler is powdery, the inner pipe and the outer pipe are conveniently filled, and meanwhile, the pressure in a high-pressure environment can be buffered and dispersed.

The utility model has the following advantages: the utility model solves the technical problems that the existing silicon nitride thermocouple protection tube has poor compression resistance effect and poor heat conduction effect and the thermocouple is easy to fall off from the silicon nitride thermocouple protection tube by additionally arranging the outer tube, filling the magnesia powder and reforming the structure of the inner tube; the problems are solved by limiting and fixing the thermocouple through the insulating sleeve, the limiting ring and the limiting fixing plate, stabilizing the structure through the reinforcing rib and the like; the utility model has safe operation and is suitable for the thermocouple protection tube.

Drawings

FIG. 1 is a cross-sectional view of a silicon nitride thermocouple protection tube according to the present invention;

FIG. 2 is a front view of a silicon nitride thermocouple protection tube according to the present invention;

FIG. 3 is a structural diagram of an inner tube of a silicon nitride thermocouple protection tube according to the present invention;

FIG. 4 is a top view of a silicon nitride thermocouple protection tube according to the present invention;

FIG. 5 is a structural diagram of a spacing ring of the silicon nitride thermocouple protection tube according to the present invention;

fig. 6 is a cross-sectional view of an insulating sleeve of a silicon nitride thermocouple protection tube according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-6:

a silicon nitride thermocouple protection tube comprises an inner tube 4 and an outer tube 11, and is characterized in that: a group of limiting rings 5 are arranged in the inner pipe 4, a group of supporting shafts 6 are arranged in the limiting rings 5, a second silicon nitride thermocouple through hole 7 is arranged at the center of the limiting ring 5, an insulating sleeve 8 is arranged at the bottom inside the inner tube 4, a spiral ring 9 is arranged in the insulating sleeve 8, a group of reinforcing ribs 10 are arranged on the inner pipe 4, the group of reinforcing ribs 10 is fixedly connected with the outer pipe 11, a buffering filler 12 is arranged between the outer pipe 11 and the inner pipe 4, the upper part of the inner pipe is provided with a fixing device, the fixing device comprises a base 1, a limiting fixing plate 2 and a silicon nitride thermocouple through hole I3, the base 1 is fixedly connected with the inner tube 4, the base 1 is provided with a limit fixing plate 2, a first through hole 3 is formed in the limiting fixing plate 2, and the limiting fixing plate 2 is fixedly connected with the inner tube 4.

The working principle of the utility model is as follows:

insert spacing fixed plate 1 with thermocouple subassembly in proper order, insulating sleeve 8 of 5 up to the bottom of a set of spacing circles, with thermocouple tube and 8 threaded connection of insulating sleeve, insulating sleeve 8 and the inside bottom fixed connection of inner tube 4, spacing fixed plate 1 cramps the thermocouple tube, spacing fixed plate 1 and base 2 fixed connection, base 2 and inner tube 4 fixed connection, 2 bottoms of base pass through bolt and high-pressure boiler threaded connection, a silicon nitride thermocouple protection tube inserts inside the high-pressure furnace, the protection tube immerses the liquid in the high-pressure furnace, the temperature that liquid detected spreads into the magnesia powder through outer tube 11, the high efficiency of the temperature that the magnesia powder will be passed into inner tube 4, the leading-in thermocouple tube of inner tube 4 again, the thermocouple tube is with temperature feedback thermocouple subassembly display temperature.

The inner tube 4 continues to operate when the outer tube of the thermocouple assembly is broken.

When the inner tube 4 needs to be replaced or maintained, the limiting fixing plate 1 can be loosened, and the thermocouple tube can be drawn out by screwing the thermocouple tube.

The utility model has simple operation and convenient use, and is suitable for comprehensive popularization and application. 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 utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A silicon nitride thermocouple protection tube comprises an inner tube (4) and an outer tube (11), and is characterized in that: the inner tube (4) inside be equipped with a set of spacing collar (5), spacing collar (5) in be equipped with a set of back shaft (6), spacing collar (5) center department be equipped with silicon nitride thermocouple through-hole two (7), the inside bottom of inner tube (4) be equipped with insulation support (8), insulation support (8) in be equipped with helicoidal ring (9), inner tube (4) on be equipped with a set of strengthening rib (10), a set of strengthening rib (10) and outer tube (11) fixed connection, outer tube (11) and inner tube (4) between be equipped with buffering filler (12).

2. The protection tube for a silicon nitride thermocouple of claim 1, wherein: the inner tube (4) upper portion be equipped with fixing device, fixing device include base (1), spacing fixed plate (2) and silicon nitride thermocouple through-hole (3), base (1) and inner tube (4) fixed connection, base (1) on be equipped with spacing fixed plate (2), spacing fixed plate (2) in be equipped with through-hole (3), spacing fixed plate (2) and inner tube (4) fixed connection.

3. The protection tube for a silicon nitride thermocouple as claimed in claim 2, wherein: the limiting fixing plate (2) is made of stainless steel.

4. The protection tube for a silicon nitride thermocouple of claim 1, wherein: the buffer filler (12) is made of magnesia powder.