Furnace bottom sealing device of atmosphere furnace

Abstract

The utility model provides a furnace bottom sealing device of an atmosphere furnace, which comprises a furnace pipe barrel, a furnace bottom sealing device, a furnace bottom sealing device and a furnace bottom sealing device, wherein the bottom of the furnace pipe barrel is open and vertically extends downwards; the compensator is longitudinally and telescopically arranged and is hermetically mounted at the lower end of the extending part of the furnace pipe barrel; the furnace bottom frame is arranged on the inner side of the compensator and connected with the lower end of the compensator in a sealed mode. And the base is mounted at the top of the furnace underframe, and a sealing layer is arranged between the base and the furnace pipe cylinder. The longitudinal telescopic compensator is installed below the furnace pipe barrel with the bottom open, the upper end and the lower end of the compensator are connected with the furnace pipe barrel and the furnace bottom frame in a sealed mode respectively, sealing of the furnace pipe barrel is achieved, the compensator is isolated from the interior of the furnace pipe barrel in cooperation with the sealing layer arranged between the base and the furnace pipe barrel, and secondary sealing is formed; the purpose of improving the sealing safety of the furnace bottom is achieved, and the problems that an oil sealing structure is complex and inconvenient to use are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment equipment, in particular to a bottom sealing device for an atmosphere furnace. Background Art

[0002] With the rapid development of modern industrial technology, as an important heat treatment equipment, the atmosphere furnace plays an irreplaceable role in the fields of electronic ceramics, high-temperature structural ceramics, glass precision annealing, powder metallurgy, nano-material sintering, etc. The sealing performance of the atmosphere furnace is directly related to its working efficiency, energy consumption, safety performance and product quality. In the prior art, the furnace liner uses a standard head as the bottom of the furnace liner. At high temperatures, the strength of the head at the bottom of the furnace liner rapidly weakens, and it is easy to deform when carrying heavy workpieces, resulting in cracks and affecting the airtightness.

[0003] Chinese Patent CN205999467U discloses a bottom sealing device for a pit-type atmosphere carburizing furnace, including an oil seal box body, inner and outer cooling water jackets, an oil level gauge, an oil filling funnel, an oil discharge pipe, a slag cleaning pipe, a muffle tank, an oil level sensor, and an oil temperature sensor; an oil seal box body is arranged between the furnace platform and the supporting furnace body, the bottom of the oil seal box body is communicated with the oil level gauge outside the supporting furnace body through a sealing pipe, and a liquid level gauge and a thermometer are arranged on the oil level gauge; an oil filling funnel, an oil discharge pipe and a plurality of slag cleaning pipes are also arranged on the oil seal box body; an inner cooling water jacket is arranged on the inner side surface of the oil seal box body, and an outer cooling water jacket is arranged on the outer side surface, and an oil level sensor and an oil temperature sensor are arranged between the inner cooling water jacket and the oil seal box body; this new type uses an oil level gauge, an oil level sensor and an oil temperature sensor to monitor the changes of oil temperature and oil level, effectively improves the sealing effect, increases the service life of the sealing oil, avoids seal leakage, and effectively prevents the workpieces in the furnace from becoming defective products.

[0004] Although this technical solution can prevent the oil from splashing during use, the inner side of the oil is directly communicated with the inside of the muffle tank, which will still cause the problem of too high oil temperature during the operation of the carburizing furnace, and cannot eliminate the potential safety hazard of the oil being ignited. In addition, the oil accumulates the residues in the carburizing furnace during use, and a slag cleaning pipe needs to be provided, resulting in a complex structure and inconvenient use. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a bottom sealing device for an atmosphere furnace aiming at the deficiencies of the prior art. By installing a longitudinally telescopic compensator below the furnace liner cylinder with an open bottom, and the upper and lower ends of the compensator are respectively sealed and connected to the furnace liner cylinder and the bottom frame, the sealing of the furnace liner cylinder is realized. Cooperating with the sealing layer arranged between the base and the furnace liner cylinder, the compensator is isolated from the inside of the furnace liner cylinder to form a secondary seal, so as to achieve the purpose of improving the bottom sealing safety of the furnace and solve the problems of complex structure and inconvenient use of the oil sealing structure.

[0006] To achieve the above object, the present utility model provides the following technical solutions:

[0007] An atmosphere furnace bottom sealing device, comprising:

[0008] A furnace liner cylinder body, the bottom of the furnace liner cylinder body is open and extends vertically downward;

[0009] A compensator, the compensator is longitudinally telescopically arranged and is hermetically installed at the lower end of the extended part of the furnace liner cylinder body;

[0010] A furnace bottom frame, the furnace bottom frame is arranged inside the compensator and is hermetically connected to the lower end of the compensator;

[0011] A base, installed on the top of the furnace bottom frame, and a sealing layer is arranged between it and the furnace liner cylinder body.

[0012] As a preference, the compensator includes a compensation structure and a first connection structure and a second connection structure respectively arranged at the upper and lower ends of the compensation structure.

[0013] As a preference, a third connection structure matching the first connection structure is arranged at the lower end of the furnace liner cylinder body, the first connection structure and the third connection structure are detachably connected by fasteners, and a first sealing ring is arranged at the connection part.

[0014] As a preference, a fourth connection structure matching the second connection structure is radially outwardly arranged at the lower end of the furnace bottom frame, the second connection structure and the fourth connection structure are detachably connected by fasteners, and a second sealing ring is arranged at the connection part.

[0015] As a preference, a partition is longitudinally arranged at the top edge of the furnace bottom frame, and the base is hermetically installed inside the partition.

[0016] As a preference, the outer side of the sealing layer abuts against the inner wall of the furnace liner cylinder body, and its inner side abuts against the partition and the base.

[0017] As a preference, a third sealing ring is arranged at the top of the sealing layer.

[0018] As a preference, a material seat is installed on the top of the base, a convex structure is arranged at the bottom of the material seat, and a groove matching the convex structure is arranged on the top of the base.

[0019] As a preference, the compensation structure is a corrugated pipe.

[0020] As a preference, the base is made of anti-carburizing bricks.

[0021] The beneficial effects of the present utility model are as follows:

[0022] (1) The utility model realizes the sealing of the furnace lining cylinder by installing a longitudinally telescopic compensator under the furnace lining cylinder with an open bottom, and the upper and lower ends of the compensator are respectively sealed and connected to the furnace lining cylinder and the furnace bottom frame. Cooperating with the sealing layer arranged between the base and the furnace lining cylinder, the compensator is isolated from the inside of the furnace lining cylinder, forming a secondary sealing structure with good sealing effect.

[0023] (2) The utility model adopts a detachable connection method between the compensator, the furnace bottom frame and the furnace lining cylinder, which is convenient for maintenance, repair or replacement of components when needed, and reduces the maintenance cost and time cost.

[0024] (3) The utility model strengthens the structural stability and further improves the sealing effect by setting a partition plate at the top edge of the furnace bottom frame. At the same time, the base is made of anti-carburizing bricks, which enhances the high-temperature resistance and corrosion resistance, and ensures the stability and safety of the furnace bottom in a high-temperature environment.

[0025] (4) The utility model facilitates the stable installation and precise positioning of the material seat by matching the groove set at the top of the base with the convex structure at the bottom of the material seat, and also improves the adaptability of the equipment to different process requirements.

[0026] (5) The utility model can automatically adapt to the thermal expansion or cold shrinkage of the furnace lining cylinder caused by temperature changes by setting a longitudinally telescopic bellows compensator, avoiding the problem of sealing failure caused by the deformation of the furnace lining cylinder, and improving the reliability and service life of the equipment.

[0027] In summary, the utility model uses a dry seal of the compensator to replace the wet seal method in the prior art, with a simple structure and low production cost, and has the advantages of good sealing effect, convenient maintenance, safe use, high reliability and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0029] Figure 2 is the utility model Figure 1 The partial enlarged schematic diagram at I in. SPECIFIC EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0032] Embodiment 1

[0033] As Figure 1 、 2 As shown in the figure, this embodiment provides a bottom sealing device for an atmosphere furnace, including: a furnace liner cylinder body 1, the bottom of the furnace liner cylinder body 1 is open and extends vertically downward; a compensator 2, the compensator 2 is longitudinally telescopically arranged and is hermetically installed at the lower end of the extended part of the furnace liner cylinder body 1; a furnace bottom frame 3, the furnace bottom frame 3 is arranged inside the compensator 2 and is hermetically connected to the lower end of the compensator 2; a base 4, installed on the top of the furnace bottom frame 3, and a sealing layer 5 is arranged between it and the furnace liner cylinder body 1. The sealing layer 5 isolates the compensator 2 from the furnace liner cylinder body 1 while sealing, preventing high-temperature residues from falling between the compensator 2 and the furnace bottom frame 3 during operation and damaging the sealing structure.

[0034] By installing a longitudinally telescopic compensator 2 below the furnace liner cylinder body 1 with an open bottom, and the upper and lower ends of the compensator 2 are hermetically connected to the furnace liner cylinder body 1 and the furnace bottom frame 3 respectively, the sealing of the furnace liner cylinder body 1 is achieved. Cooperating with the sealing layer 5 arranged between the base 4 and the furnace liner cylinder body 1, the compensator 2 is isolated from the inside of the furnace liner cylinder body 1, forming a two-stage sealing structure with a good sealing effect.

[0035] As Figure 1 、 2As shown, the compensator 2 includes a compensation structure 21, and a first connection structure 22 and a second connection structure 23 respectively arranged at the upper and lower ends of the compensation structure 21. The first connection structure 22 and the second connection structure 23 are hermetically welded to the compensation structure 21. A third connection structure 11 matching the first connection structure 22 is arranged at the lower end of the furnace liner cylinder 1. The first connection structure 22 and the third connection structure 11 are detachably connected by fasteners 6, and a first sealing ring 7 is arranged at the connection. A fourth connection structure 31 matching the second connection structure 23 is radially outwardly arranged at the lower end of the furnace bottom frame 3. The second connection structure 23 and the fourth connection structure 31 are detachably connected by fasteners 6, and a second sealing ring 8 is arranged at the connection. The first connection structure 22, the second connection structure 23, the third connection structure 11, and the fourth connection structure 31 are all flanges.

[0036] By adopting a detachable connection method between the compensator 2, the furnace bottom frame 3 and the furnace liner cylinder 1, it is convenient to carry out maintenance, repair or component replacement when needed, reducing the maintenance cost and time cost.

[0037] As Figure 1 , 2 shown, a partition 32 is longitudinally arranged at the top edge of the furnace bottom frame 3, and the base 4 is hermetically installed inside the partition 32. The outer side of the sealing layer 5 abuts against the inner wall of the furnace liner cylinder 1, and its inner side abuts against the partition 32 and the base 4. A third sealing ring 51 is arranged at the top of the sealing layer 5. The base 4 is made of anti-carburizing bricks.

[0038] By arranging the partition 32 at the top edge of the furnace bottom frame 3, not only the structural stability is enhanced, but also the sealing effect is further improved. At the same time, the base is made of anti-carburizing bricks, enhancing the high-temperature resistance and corrosion resistance, and ensuring the stability and safety of the furnace bottom in a high-temperature environment.

[0039] As Figure 1 shown, a material seat 9 is installed on the top of the base 4. A convex structure 91 is arranged at the bottom of the material seat 9, and a groove 41 matching the convex structure 91 is arranged at the top of the base 4.

[0040] By arranging the groove 41 at the top of the base 4 to cooperate with the convex structure 91 at the bottom of the material seat 9, it is convenient for the stable installation and precise positioning of the material seat 9, and at the same time, it also improves the adaptability of the equipment to different process requirements.

[0041] Furthermore, the cross-section of the compensation structure 21 is corrugated.

[0042] Furthermore, the compensation structure 21 is a bellows made of stainless steel plate.

[0043] By setting the longitudinally telescopic bellows compensator 21, it can automatically adapt to the thermal expansion or contraction of the furnace drum due to temperature changes, avoiding the problem of seal failure caused by the deformation of the furnace drum 1, and improving the reliability and service life of the equipment.

[0044] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An atmosphere furnace bottom sealing device, characterized in that: include: A furnace cylinder (1), wherein the furnace cylinder (1) is open at the bottom and extends vertically downward; A compensator (2), the compensator (2) being longitudinally telescopically arranged and being sealed and mounted on the lower end of the extended portion of the furnace cylinder (1); A furnace bottom frame (3), the furnace bottom frame (3) being arranged inside the compensator (2) and being sealedly connected to the lower end of the compensator (2); A base (4) is installed on the top of the furnace bottom frame (3), and a sealing layer (5) is provided between the base (4) and the furnace cylinder (1).

2. The atmosphere furnace bottom sealing device according to claim 1, characterized in that: The compensator (2) comprises a compensation structure (21), and a first connection structure (22) and a second connection structure (23) respectively arranged at the upper and lower ends of the compensation structure (21).

3. The atmosphere furnace bottom sealing device according to claim 2, characterized in that: A third connection structure (11) cooperating with the first connection structure (22) is provided at the lower end of the furnace cylinder (1); the first connection structure (22) and the third connection structure (11) are detachably connected via a fastener (6), and a first sealing ring (7) is provided at the connection.

4. The atmosphere furnace bottom sealing device according to claim 3, characterized in that: A fourth connection structure (31) is provided radially outwardly at the lower end of the furnace bottom frame (3) and is matched with the second connection structure (23); the second connection structure (23) and the fourth connection structure (31) are detachably connected via a fastener (6), and a second sealing ring (8) is provided at the connection.

5. The atmosphere furnace bottom sealing device according to claim 1, characterized in that: A partition (32) is longitudinally arranged on the top edge of the furnace bottom frame (3), and the base (4) is sealed and installed on the inner side of the partition (32).

6. The atmosphere furnace bottom sealing device according to claim 5, characterized in that: The outer side of the sealing layer (5) abuts against the inner wall of the furnace cylinder (1), and the inner side of the sealing layer (5) abuts against the partition plate (32) and the base (4).

7. The atmosphere furnace bottom sealing device according to claim 1, characterized in that: A third sealing ring (51) is provided on the top of the sealing layer (5).

8. The atmosphere furnace bottom sealing device according to claim 1, characterized in that: A material seat (9) is installed on the top of the base (4), a protruding structure (91) is provided at the bottom of the material seat (9), and a groove (41) matching with the protruding structure (91) is provided at the top of the base (4).

9. The atmosphere furnace bottom sealing device according to claim 2, characterized in that: The cross section of the compensation structure (21) is corrugated.

10. The atmosphere furnace bottom sealing device according to claim 1, characterized in that: The base (4) is made of anti-carburization bricks.

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