CN215365951U

CN215365951U - Large-scale nitriding furnace muffle multi-expansion joint sealing structure

Info

Publication number: CN215365951U
Application number: CN202121043029.XU
Authority: CN
Inventors: 郭嘉毅; 吴斌
Original assignee: SUZHOU MINSHENG ELECTRIC HEATING ENGINEERING CO LTD
Current assignee: SUZHOU MINSHENG ELECTRIC HEATING ENGINEERING CO LTD
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-12-31
Anticipated expiration: 2031-05-17

Abstract

The utility model discloses a muffle multi-expansion joint sealing structure of a large nitriding furnace, which comprises a muffle, wherein a guide cylinder is arranged in the muffle, the lower end of the guide cylinder is provided with a furnace bottom, the lower end of the furnace bottom is provided with a furnace base, the lower end of the furnace base is respectively provided with a plurality of supporting legs, the other ends of the plurality of supporting legs, which are far away from the furnace base, are provided with a furnace shell base, and steel pipes which are matched, correspondingly sleeved and connected with the plurality of supporting legs are respectively arranged on the furnace shell base. The utility model has the beneficial effects that: the problem of large-scale nitriding furnace muffle life weak point is solved, the muffle bottom uses the independent sealing of the small-size expansion joint of multiunit, and stove bottom weighing part and muffle are disconnected, have avoided the bearing of muffle bottom, have also solved large-scale nitriding furnace sealing problem.

Description

Large-scale nitriding furnace muffle multi-expansion joint sealing structure

Technical Field

The utility model relates to the technical field of heat treatment, in particular to a muffle multi-expansion joint sealing structure of a large nitriding furnace.

Background

The nitriding furnace used in the heat treatment industry at present is basically small-sized equipment, the bottom of a muffle tank is of a spherical end socket or butterfly end socket type structure, a furnace base is arranged in the end socket, the whole weight of a treatment workpiece and the whole weight of the furnace base are both borne on the butterfly end socket, a spring system for absorbing thermal expansion deformation is arranged at the lower part of the end socket, and the elastic bearing capacity of the system, the bearing capacity of the muffle and the service life of the muffle tank have a contradiction relation.

The spring elastic capacity is weak, and work piece weight is whole to be pressed at butterfly head, if handle the work piece overweight, long-term the use can be broken the muffle and warp, if spring elasticity is strong, then the muffle is heated the expansion and can receive spring force restriction to make the muffle warp the damage, receives this kind of restriction, and the nitriding furnace is handled the work piece and can not be adapted to large-scale work piece.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a muffle multi-expansion joint sealing structure of a large nitriding furnace, which aims to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a many expansion joint seal structure of large-scale nitriding furnace muffle, includes the muffle, be equipped with the draft tube in the muffle, the draft tube lower extreme is equipped with the stove bottom, the stove bottom lower extreme is equipped with the stove base, stove base lower extreme is equipped with a plurality of landing legs respectively, and is a plurality of the landing leg is kept away from the other end of stove base is equipped with the stove outer covering base, be equipped with respectively on the stove outer covering base with a plurality of the landing leg matches the steel pipe that corresponds and cup joint.

Preferably, sealing flanges connected with the furnace base and the furnace shell base are respectively arranged at two ends of the plurality of steel pipes.

Preferably, a plurality of layers of expansion joints are arranged on the outer sides of the steel pipes.

Preferably, the diameter of a plurality of the supporting legs is 360mm, and the diameter of a plurality of the steel pipes is 370 mm.

Preferably, the furnace bottom is formed by assembling and welding steel plates and building fireproof bricks.

Preferably, heat-resistant silicon rubber sealing rings are arranged between the sealing flanges.

Advantageous effects

The large nitriding furnace muffle multi-expansion joint sealing structure solves the problem that the service life of a large nitriding furnace muffle is short, the bottom of the muffle is independently sealed by a plurality of groups of small expansion joints, and the furnace bottom weighing part is not connected with the muffle, so that the bearing of the muffle bottom is avoided, and the sealing problem of the large nitriding furnace is also solved.

Drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of the present invention;

FIG. 2 is an enlarged view of the point A in FIG. 1;

FIG. 3 is a schematic view of the structure of the draft tube of the present invention;

FIG. 4 is a schematic view of the overall structure of the present invention;

fig. 5 is another angle structure diagram of the overall structure of the present invention.

Reference numerals

1-muffle, 2-draft tube, 3-furnace bottom, 4-furnace base, 5-supporting legs, 6-furnace shell base, 7-steel tube, 8-expansion joint and 9-sealing flange.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Examples

As shown in figures 1-5, a many expansion joint seal structure of large-scale nitriding furnace muffle, including muffle 1, be equipped with draft tube 2 in the muffle 1, 2 lower extremes of draft tube are equipped with

stove bottom

3, and 3 lower extremes of stove bottom are equipped with

stove base

4, and 4 lower extremes of stove base are equipped with a plurality of landing legs 5 respectively, and the other end that stove base 4 was kept away from to a plurality of landing legs 5 is equipped with stove outer covering base 6, is equipped with respectively on the stove outer covering base 6 to correspond the steel pipe 7 that cup joints with a plurality of landing legs 5 matching.

Preferably, sealing flanges 9 connected with the furnace base 4 and the furnace shell base 6 are respectively arranged at two ends of the plurality of steel pipes 7.

Preferably, a plurality of layers of expansion joints 8 are arranged on the outer sides of the plurality of steel pipes 7.

Preferably, the diameter of the plurality of legs 5 is 360mm, and the diameter of the plurality of steel pipes 7 is 370 mm.

Preferably, the furnace bottom 3 is composed of steel plates which are assembled and welded and fireproof bricks which are built.

Preferably, heat-resistant silicon rubber sealing rings are arranged between the sealing flanges 9.

A muffle multi-expansion joint sealing device of a large nitriding furnace is characterized in that a muffle is designed into a cone opening flat bottom structure, the muffle is sealed by a flat plate after being closed to the size of a furnace bottom at the lower part of a guide cylinder, a hole with the diameter of 400mm is formed in a bottom plate, a connecting pipe and a flange are arranged at the lower part of the guide cylinder, the furnace bottom is formed by assembling and welding section steel plates, the furnace bottom is built by refractory bricks and used as an equipment bearing part for bearing the weight of a workpiece, a steel pipe with the diameter of 360mm is arranged at the lower part of the furnace bottom and used as a supporting leg of the furnace bottom, a steel pipe with the diameter of 370mm is arranged at the corresponding position of the supporting leg of the furnace bottom on a furnace shell base and sleeved with each other, so that the position of the furnace bottom can be prevented from being changed and the furnace bottom can be conveniently disassembled, the furnace bottom can be directly lifted out from the muffle opening when being disassembled, a flange which is the same as the flange at each reserved hole at the bottom of the muffle is arranged on the furnace base, an expansion joint is arranged between the two flanges, and a heat-resistant silicon rubber sealing ring is arranged between the flanges, the muffle bottom expansion joint is internally and externally sealed to achieve muffle bottom sealing, meanwhile, the weight of a workpiece is completely borne on the furnace bottom, the furnace bottom and the muffle are not mutually connected, the weight directly acts on a furnace shell base to achieve the purpose that the bearing capacity of equipment is greatly improved, the muffle bottom expansion joint is applicable to super-huge nitriding furnace equipment, the expansion amount of the muffle subjected to thermal expansion is absorbed by multiple groups of small expansion joints, and the small expansion joints are soft in elasticity, so that the muffle cannot be damaged due to overlarge elasticity, the manufacturing cost is low, and the service life of the muffle is longer.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the contents of the present invention within the scope of the protection of the present invention.

Claims

1. The utility model provides a large-scale nitriding furnace muffle multiple expansion joint seal structure, includes muffle (1), its characterized in that: be equipped with draft tube (2) in muffle (1), draft tube (2) lower extreme is equipped with stove bottom (3), stove bottom (3) lower extreme is equipped with stove base (4), stove base (4) lower extreme is equipped with a plurality of landing legs (5) respectively, and is a plurality of landing leg (5) are kept away from the other end of stove base (4) is equipped with stove outer covering base (6), be equipped with respectively on stove outer covering base (6) with a plurality of landing leg (5) match and correspond steel pipe (7) that cup joint.

2. The large nitriding furnace muffle multiple expansion joint sealing structure of claim 1, wherein: and sealing flanges (9) connected with the furnace base (4) and the furnace shell base (6) are respectively arranged at two ends of the steel pipes (7).

3. The large nitriding furnace muffle multiple expansion joint sealing structure of claim 1, wherein: and a plurality of layers of expansion joints (8) are arranged on the outer sides of the steel pipes (7).

4. The large nitriding furnace muffle multiple expansion joint sealing structure of claim 1, wherein: the diameter of a plurality of the supporting legs (5) is 360 millimeters, and the diameter of a plurality of the steel pipes (7) is 370 millimeters.

5. The large nitriding furnace muffle multiple expansion joint sealing structure of claim 1, wherein: the furnace bottom (3) is formed by assembling and welding steel plates and building fireproof bricks.

6. The large nitriding furnace muffle multiple expansion joint sealing structure of claim 1, wherein: and heat-resistant silicon rubber sealing rings are arranged between the sealing flanges (9).