CN217383722U

CN217383722U - Atmosphere sintering furnace for producing pressure silicon nitride thermocouple protective sleeve

Info

Publication number: CN217383722U
Application number: CN202221196837.4U
Authority: CN
Inventors: 陈花朵; 王长春; 刘源; 赵振威; 刘军利
Original assignee: Henan Beixing Jinggong Technology Co ltd
Current assignee: Henan Beixing Jinggong Technology Co ltd
Priority date: 2022-05-17
Filing date: 2022-05-17
Publication date: 2022-09-06
Anticipated expiration: 2032-05-17

Abstract

The utility model relates to a thermocouple protective case production technical field discloses an atmosphere fritting furnace is used in production of atmospheric pressure silicon nitride thermocouple protective case, set up the body bracket in the furnace body including furnace body and activity, the body bracket includes horizontal base plate and extension board, and two piece at least extension boards set up in the top surface of horizontal base plate in parallel to each other, are equipped with the recess on every extension board, and the recess on every extension board matches with the recess that corresponds on other extension boards respectively, forms and is used for placing sheathed tube portion that holds along the recess axis. The device can make full use of the sintering space by arranging the blank bracket, and enables the process gas to flow freely in the blank bracket, thereby ensuring the full contact of the sleeve blank and the process gas, improving the uniformity of sintered products and ensuring the sintering yield.

Description

Atmosphere sintering furnace for producing pressure silicon nitride thermocouple protective sleeve

Technical Field

The utility model relates to a thermocouple protective case production technical field, in particular to atmosphere fritting furnace is used in production of atmospheric pressure silicon nitride thermocouple protective case.

Background

Silicon nitride is a ceramic material with extremely high strength, and the thermocouple protection sleeve made of the silicon nitride material has extremely high erosion resistance, corrosion resistance, scouring resistance, excellent heat conduction performance and very quick response to temperature, and can be widely applied to the links of casting temperature measurement and temperature control of nonferrous metals. The preparation process of the silicon nitride thermocouple protective sleeve generally needs to fully mix a plurality of raw materials containing silicon nitride to prepare a blank, then the blank is dried and placed into an atmosphere sintering furnace for sintering to obtain the silicon nitride thermocouple protective sleeve, and helium, nitrogen or other process gases can be introduced into the atmosphere sintering furnace during sintering to improve the performance of the protective sleeve.

In order to fully utilize the sintering space, the tray for placing the green body to be sintered in the existing atmosphere sintering furnace is generally of a multi-layer stacked structure, for example, a high-temperature resistant graphite support for sintering a thin-wall silicon carbide pipe disclosed in patent document with publication number CN214747274U comprises at least one graphite plate, the upper surface of each graphite plate is provided with a plurality of accommodating grooves for placing the pipe, the bottom of the graphite plate is provided with a plurality of supporting protrusions, and the accommodating grooves and the supporting protrusions are arranged in a staggered manner. When the device is used, the pre-sintering pipes are placed in the accommodating grooves, then the supports are placed in the sintering furnace layer by layer, so that the supporting protrusions of the upper graphite plate are in contact with the upper surface of the lower graphite plate, a certain gap is guaranteed between the two layers of graphite plates, sintering waste gas is discharged, and the pre-sintering pipes of different specifications can be placed in a large space conveniently. The device utilizes the sintering space in the sintering furnace along with the better, but because the presintering pipe and the accommodating groove are in close contact by means of gravity, only a small amount of air holes at the bottom of the accommodating groove ensure that the bottom of the presintering pipe can be in contact with process gas, so that the contact between the part of the presintering pipe in close contact with the accommodating groove of the graphite plate and the process gas is insufficient, the uniformity of sintered products is affected, and the sintering yield is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above situation, the utility model aims at providing an atmosphere fritting furnace is used in production of atmospheric pressure silicon nitride thermocouple protective case, the device's bracket can increase the area of contact of treating sintering body and process gas, improves the homogeneity of sintering product, guarantees the sintering yields.

In order to achieve the above object, the present invention is realized by the following technical solutions:

the utility model provides an atmosphere fritting furnace is used in production of atmospheric pressure silicon nitride thermocouple protective case, includes that furnace body and activity set up the body bracket in the furnace body, the body bracket includes horizontal base plate and extension board, and two piece at least extension boards set up in the top surface of horizontal base plate in parallel to each other, are equipped with the recess on every extension board, and the recess on every extension board matches with the recess that corresponds on other extension boards respectively, forms the portion of holding that is used for placing the sleeve pipe body along the recess axis.

It should be noted that, the grooves on each support plate are respectively matched with the corresponding grooves on other support plates, which means that the axes of the grooves for placing the same sleeve blank are mutually overlapped to form uniform support for the sleeve blank. The number of the accommodating parts is at least one.

The utility model discloses in, the furnace body adopts the conventional setting in this field, for example, it includes the insulation box body usually, set up in the insulation box body heating device, be used for letting in process gas's admission line and the exhaust duct who is used for the waste gas in the exhaust box body in to the box, in order to guarantee the atmosphere uniformity in the box body, the admission line accessible has the gas distribution device of a plurality of gas outlets and lets in process gas to the box body uniformly.

When the device works, the sleeve blank to be sintered is placed in the accommodating part, the support plates integrally support the sleeve blank, and a channel which is beneficial to the circulation of process gas is formed between every two adjacent support plates, so that one surface of the sleeve blank facing the horizontal substrate can be fully contacted with the process gas, and the uniformity of a sintered product is improved.

The groove can be selected according to actual requirements, and particularly is arc-shaped, V-shaped or U-shaped. Preferably, the groove is V-shaped, and when the circular-tube-shaped sleeve blank is erected in the accommodating part formed by the V-shaped groove, a gap is reserved between the bottom of the sleeve blank and the bottom of the V-shaped groove, so that the circulation of process gas in the blank bracket can be further improved, and the contact area between the process gas and the sleeve blank is ensured.

Furthermore, the support plate is perpendicular to the horizontal substrate, so that the support plate can be used for supporting the sleeve blank higher, the process gas has a larger circulation space between the sleeve blank and the horizontal substrate, and the sleeve blank is further ensured to be fully contacted with the process gas.

Furthermore, strip-shaped vent holes parallel to the length direction of the support plates are formed between two adjacent support plates on the horizontal base plate, so that process gas can flow between different green body brackets when a plurality of green body brackets are stacked; in addition, the process gas can enter the interior of the blank bracket from the side surface and the top surface of the blank bracket, and the process gas can flow into and out of the blank bracket from multiple directions, so that the process gas is further ensured to be fully contacted with the sleeve blank. Preferably, the gas distribution device is arranged in the furnace body, so that the spraying direction of the process gas is set to be a direction which is vertically downward, vertically upward, horizontally parallel to the support plate or alternatively performed by the three, the consistency of the atmosphere in the sintering furnace is ensured, and the uniformity of the sintered product is further improved.

Furthermore, the support plate is a heat-conducting ceramic support plate, and the support plate made of the heat-conducting ceramic material has a high heat conductivity coefficient, so that the contact part of the sleeve blank and the inner wall of the groove can be uniformly heated.

Furthermore, the bottom surface of the horizontal base plate is provided with at least two supporting plates, and the length direction of the supporting plates is perpendicular to the length direction of the supporting plates. When a plurality of blank brackets are stacked, the support plate can ensure that enough process gas circulation space is reserved between the sleeve blank on the lower blank bracket and the horizontal substrate of the upper blank bracket, thereby ensuring that the sleeve blank is fully contacted with the process gas. Preferably, the two support plates are positioned at two ends of the bottom surface of the horizontal base plate, so that the stability of the blank bracket is ensured.

Furthermore, a graphite heat conduction layer is arranged on the inner wall of the groove. The graphite is soft and has good thermal conductivity, the blank bracket can be prevented from scratching the sleeve blank, and the sleeve blank is further ensured to be uniformly heated.

It should be noted that, in the present invention, the process gas is a conventional choice in the art, and specifically, may be one or more of hydrogen, nitrogen, helium, neon, and argon,

The utility model discloses in still including other subassemblies that can make normal use of atmosphere fritting furnace, all belong to the conventional selection in this field. In addition, the device or the assembly which is not limited in the utility model adopts the conventional means in the field, for example, the horizontal base plate, the heat conducting ceramic support plate, the graphite heat conducting layer and the like all adopt the conventional arrangement.

Compared with the prior art, the beneficial effects of the utility model are that:

this device is through setting up the body bracket, can make full use of sintering space to make process gas can the free flow in the body bracket, thereby guarantee sleeve pipe body and process gas's abundant contact, improve the homogeneity of sintered product, guarantee the sintering yields.

Drawings

FIG. 1 is a schematic structural diagram of an atmosphere sintering furnace for producing a pressure silicon nitride thermocouple protective sleeve according to an embodiment;

FIG. 2 is a schematic structural view of a blank holder in an embodiment;

fig. 3 is a view from a-a in fig. 2.

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, 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 all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description, and do not indicate or limit that the indicated device or element must be constructed and operated in a specific orientation.

Examples

As shown in fig. 1-3, an atmosphere sintering furnace for producing a pressure silicon nitride thermocouple protective sleeve comprises a furnace body 4 and a blank bracket movably arranged in the furnace body 4, wherein the blank bracket comprises a horizontal base plate 1 and support plates 2, ten support plates 2 are mutually parallel and vertically arranged on the top surface of the horizontal base plate 1, the ten support plates 2 are uniformly arranged at equal intervals, eight V-shaped grooves 21 are uniformly arranged at equal intervals on each support plate 2, the V-shaped grooves 21 on each support plate are respectively matched with corresponding V-shaped grooves 21 on other support plates 2, eight accommodating parts for placing sleeve blanks along the axes of the V-shaped grooves 21 are formed at the top of the blank bracket, specifically, the V-shaped grooves 21 on each support plate 2 are respectively matched with corresponding V-shaped grooves 21 on other support plates 2, which means that the axes of the V-shaped grooves 21 for placing the same sleeve blank are mutually overlapped, thereby forming uniform support for the sleeve blank.

And a graphite heat conduction layer 22 is arranged on the inner wall of the V-shaped groove 21.

And a long strip-shaped vent hole 11 parallel to the length direction of the support plate 2 is formed between two adjacent support plates 2 on the horizontal base plate 1.

The support plate 2 is a heat-conducting ceramic support plate.

The bottom surface of the horizontal base plate 1 is provided with two supporting plates 3, the length direction of the supporting plates 3 is perpendicular to the length direction of the supporting plate 2, and the two supporting plates 3 are respectively positioned at two ends of the bottom surface of the horizontal base plate 1.

The furnace body 4 comprises a sintering cavity 41, a horizontal gas distribution device 42 for horizontally spraying process gas and a vertical gas distribution device 43 for vertically spraying the process gas are arranged in the sintering cavity 41, and when the sleeve blank is sintered, the blank bracket is stacked in the sintering cavity 41 in a manner that the support plate 2 is parallel to the horizontal spraying direction of the process gas, so that the process gas can flow into and out of the blank bracket from multiple directions, and the process gas is ensured to be fully contacted with the sleeve blank.

The foregoing description of the embodiments of the invention has been presented for purposes of illustration and not limitation, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.

Claims

1. The atmosphere sintering furnace for producing the pressure silicon nitride thermocouple protection sleeve comprises a furnace body and a blank bracket movably arranged in the furnace body, and is characterized in that the blank bracket comprises a horizontal base plate and support plates, at least two support plates are arranged on the top surface of the horizontal base plate in parallel, a groove is arranged on each support plate, the grooves on each support plate are matched with corresponding grooves on other support plates respectively, and a containing part for placing a sleeve blank along the axis of the groove is formed.

2. The atmospheric sintering furnace for producing the gas-pressure silicon nitride thermocouple protection sleeve according to claim 1, wherein the groove is arc-shaped, V-shaped or U-shaped.

3. The atmospheric sintering furnace for producing the gas-pressure silicon nitride thermocouple protection sleeve according to claim 1, wherein the support plate is perpendicular to the horizontal substrate.

4. The atmospheric sintering furnace for producing the atmospheric pressure silicon nitride thermocouple protective sleeve according to claim 1, wherein an elongated vent hole parallel to the length direction of the support plate is arranged between two adjacent support plates on the horizontal substrate.

5. The atmospheric sintering furnace for producing the gas-pressure silicon nitride thermocouple protective sleeve according to claim 1, wherein the support plate is a heat-conducting ceramic support plate.

6. The atmospheric sintering furnace for producing the atmospheric silicon nitride thermocouple protective sleeve according to any one of claims 1 to 5, wherein at least two support plates are arranged on the bottom surface of the horizontal substrate, and the length direction of the support plates is perpendicular to the length direction of the support plates.

7. The atmosphere sintering furnace for producing the gas pressure silicon nitride thermocouple protective sleeve according to any one of claims 1 to 5, wherein a graphite heat conduction layer is arranged on the inner wall of the groove.