A sealed sintering furnace

Abstract

The invention provides a sealed sintering furnace, comprising a sintering furnace body, wherein the sintering furnace body comprises a front plate, a furnace body opening is formed on the front plate, a cover door is formed at the furnace body opening, a cover lock is formed on the cover door, a sinking wall is formed on the front plate, the sinking wall is located around the furnace body opening, an annular groove is formed on the sinking wall, a graphite gasket is formed on the inner side of the cover door, and an airbag strip is formed in the middle of the graphite gasket; when the cover door is closed, the graphite gasket abuts against the sinking wall, and the airbag strip abuts against the annular groove; the graphite gasket is formed by stacking and pressing a plurality of flexible graphite papers, vermiculite powder is attached to one side of the flexible graphite papers, and in the stacked flexible graphite papers, the vermiculite powder on adjacent flexible graphite papers is attached to opposite sides, forming a graphite gasket structure with vermiculite powder on both sides and no vermiculite powder in the middle, and a plurality of columnar air grooves are respectively formed on both sides of the graphite gasket. This solution can well maintain the sealing performance and thermal insulation performance of the structure.

Description

Technical Field

[0001] The invention relates to the technical field of sintering furnace design and manufacturing, in particular to a sealed sintering furnace. Background Art

[0002] A sintering furnace is a special equipment that enables powder compacts to obtain the required physical, mechanical properties and microstructure through sintering. It can process metal materials and various non-metallic materials such as silicon.

[0003] Due to the operating characteristics of sintering furnaces, they place high demands on the thermal insulation and sealing properties of the furnace body. Traditional sintering furnace doors typically use asbestos sealing layers or high-temperature resistant rubber strips as sealing structures. This structure typically relies on the snap-fitting and abutting of the sealing groove and the sealing strip for sealing. This requires high dimensional accuracy during the initial measurement and processing of the sealing groove and the sealing strip. Moreover, the sealing and thermal insulation performance of this method still needs to be improved. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a sealed sintering furnace, the sealing structures of which are more closely fitted, and have better sealing and heat preservation properties.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A sealed sintering furnace comprises a sintering furnace body, the sintering furnace body comprising a front plate, a furnace body opening being formed on the front plate, a cover door being provided at the furnace body opening, a cover lock being provided on the cover door, a sunken wall being provided on the front plate, the sunken wall being located around the furnace body opening, an annular groove being formed on the sunken wall, a graphite gasket being provided on the inner side surface of the cover door, and an airbag strip being provided in the middle of the graphite gasket; when the cover door is closed, the graphite gasket abuts against the sunken wall, and the airbag strip abuts against the annular groove;

[0007] The graphite gasket is formed by stacking and pressing a plurality of flexible graphite papers. Vermiculite powder is attached to one side of the flexible graphite paper. In the stacked flexible graphite papers, the vermiculite powder on adjacent flexible graphite papers is attached to opposite sides, forming a graphite gasket structure with vermiculite powder on both sides and no vermiculite powder in the middle. A plurality of columnar air grooves are respectively opened on both sides of the graphite gasket.

[0008] The present invention is further configured such that the cross sections of the annular groove and the airbag strip are both trapezoidal.

[0009] The present invention is further configured as follows: a cavity is provided inside the airbag strip, a spring sheet with a serpentine cross section is provided in the cavity, and two ends of the spring sheet respectively abut against the obtuse angles of the trapezoidal cross section of the airbag strip.

[0010] The present invention is further configured as follows: the spring sheet is a carbon steel sheet, and the surface of the spring sheet is coated with high-temperature resistant rubber.

[0011] The present invention is further configured such that: a cavity is provided inside the cover door, and a heat-insulating layer is provided in the cavity.

[0012] The present invention is further configured as follows: the insulation layer is a multi-layer structure, including asbestos boards located at the bottom and top layers respectively, glass fiber batts are arranged between the two asbestos boards, and ceramic powder is adhered to the glass fiber batts via high temperature resistant pressure sensitive adhesive.

[0013] The present invention is further configured such that: the ceramic powder is a porous microbead structure.

[0014] The present invention is further configured such that: the depth of the columnar air groove provided on the graphite gasket is 2 / 3 of the thickness of the graphite gasket.

[0015] The present invention is further configured as follows: a heat-insulating cover is provided on the side of the cover door, a concave surface is provided on the inner side of the heat-insulating cover, and the heat-insulating cover and the front plate are adsorbed by negative pressure.

[0016] The present invention has the following beneficial effects:

[0017] When the cover door is closed, the contact between the graphite gasket and the sunken wall, and the contact between the airbag strip and the ring groove, enhances the cover door's sealing effectiveness. Furthermore, the graphite gasket is coated with vermiculite powder on both sides. This powder loses water and expands at high temperatures, causing subtle deformation of the graphite gasket, allowing it to fit more closely to the sunken wall. Furthermore, thanks to the cover lock, deformation of the graphite gasket does not force the cover door and front panel apart. These features enhance sealing precision, improving both airtightness and thermal insulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure after removing the cover door in an embodiment of the present invention;

[0020] Figure 3 This is a structural diagram of the cover door and the front panel in an embodiment of the present invention;

[0021] Figure 4 Schematic diagram of the structure of the graphite gasket in an embodiment of the present invention.

[0022] In the above drawings: 1. front plate; 2. cover door; 3. cover lock; 4. sinking wall; 5. ring groove; 6. graphite gasket; 7. vermiculite powder; 8. airbag strip; 9. spring sheet; 11. insulation layer; 12. columnar air groove; 13. flexible graphite paper; 14. insulation cover. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, a sealed sintering furnace includes a sintering furnace body, which includes a front plate 1 with a square furnace opening in the middle. A cover door 2 is connected to the furnace opening and is equipped with a door lock. A thermal insulation cover 14 is bonded to the four sides of the cover door 2. The thermal insulation cover 14 is made of rubber and has a concave inner surface, i.e., the side closest to the front plate 1. The thermal insulation cover 14 and the front plate 1 are adsorbed by negative pressure, which can improve the sealing effect at the edge of the cover door 2.

[0025] like Figure 2-4 As shown, the outer side surface of the front plate 1 is provided with an annular sunken wall 4, which is located around the opening of the furnace body. An annular groove 5 is provided in the middle of the sunken wall 4, and the cross-section of the annular groove 5 is trapezoidal. A graphite gasket 6 is bonded to the inner side surface of the cover door 2, and an airbag strip 8 is attached to the middle of the graphite gasket 6, and the cross-section of the airbag strip 8 is trapezoidal. When the cover door 2 is closed and locked, the graphite gasket 6 contacts the sunken wall 4, and the airbag strip 8 contacts the annular groove 5. When the cover door 2 is closed, the contact between the graphite gasket 6 and the sunken wall 4, and the contact between the airbag strip 8 and the annular groove 5, can improve the sealing effect of the cover door 2.

[0026] Wherein, graphite gasket 6 is formed by some flexible graphite papers 13 stacking and compressing, one side of flexible graphite papers 13 adheres to vermiculite powder 7, and in the flexible graphite papers 13 that are stacked, vermiculite powder 7 is attached to opposite side on adjacent flexible graphite papers 13, forms both sides and has vermiculite powder 7, and the graphite gasket 6 structure that middle part does not contain vermiculite powder 7.The density of the graphite gasket 6 that middle part does not contain vermiculite powder 7 is 1.5g / cm , the vermiculite powder 7 addition in both side areas is 3% of the graphite gasket 6 deadweight in both side areas.Graphite gasket 6 is set to both sides and is attached to vermiculite powder 7, and vermiculite powder 7 can dehydrate and expand at high temperature, thereby drives the slight deformation of graphite gasket 6, makes graphite gasket 6 more fit with sinking wall 4, and simultaneously due to the existence of cover lock 3, the deformation of graphite gasket 6 can not open cover door 2 and front plate 1. This product only needs to be heated for the first time to be shaped and maintain the sealing performance of its structure.

[0027] Several columnar air grooves 12 are defined on both sides of the graphite gasket 6 where the vermiculite powder 7 is added. The depth of each columnar air groove 12 is two-thirds the thickness of the graphite gasket 6. These columnar air grooves 12 facilitate the expansion of the vermiculite powder 7. Furthermore, when the graphite gasket 6 abuts against the sinking wall 4, the air in the columnar air grooves 12 is expelled by the deformation of the graphite gasket 6 when the cover door 2 is closed. This creates a negative pressure, adsorbing the graphite gasket 6 to the sinking wall 4, thereby improving the seal.

[0028] There is a cavity inside the airbag strip 8, in which a spring sheet 9 with a serpentine cross-section is disposed. The two ends of the spring sheet 9 respectively abut against the obtuse angles of the trapezoidal cross-section of the airbag strip 8. This spring sheet 9 is made of carbon steel and is coated with high-temperature-resistant rubber. The airbag strip 8 itself is 1.5 centimeters thick and has a certain degree of support and structural strength. When heated in the sintering furnace, the air inside the airbag strip 8 expands due to the heat, further inflating the airbag strip 8 and filling the gap between the annular groove 5 and the airbag strip 8. At the same time, the two ends of the spring sheet 9 abut against the obtuse angles of the trapezoidal cross-section of the airbag strip 8. When the cover door 2 is closed, the spring sheet 9 is partially squeezed and deformed, and its two ends will be stretched toward the ends of the airbag strip 8, thereby further compressing the gap between the airbag strip 8 and the annular groove 5 at the corner. With the above arrangement, even if the dimensional accuracy during the initial measurement and processing of the sealing structure is not high, the sealing and thermal insulation properties of the structure can be well maintained.

[0029] Within the cover door 2 lies a cavity containing an insulation layer 11. This layer 11 is a multi-layer structure comprising a bottom and top asbestos sheet, with fiberglass batting interposed between the two asbestos sheets. Ceramic powder, in the form of porous microspheres, is adhered to the fiberglass batting via a high-temperature resistant, pressure-sensitive adhesive.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sealed sintering furnace, comprising a sintering furnace body, wherein the sintering furnace body comprises a front plate (1), a furnace body opening is formed on the front plate (1), a cover door (2) is provided at the furnace body opening, and a cover lock (3) is provided on the cover door (2), wherein: The front plate (1) is provided with a sinking wall (4), the sinking wall (4) is located around the furnace body opening, an annular groove (5) is provided on the sinking wall (4), a graphite gasket (6) is provided on the inner side surface of the cover door (2), and an airbag strip (8) is provided in the middle of the graphite gasket (6); when the cover door (2) is closed, the graphite gasket (6) is in conflict with the sinking wall (4), and the airbag strip (8) is in conflict with the annular groove (5); The graphite gasket (6) is formed by stacking and pressing a plurality of flexible graphite papers (13), one side of the flexible graphite paper (13) is attached with vermiculite powder (7), and in the stacked flexible graphite papers (13), the vermiculite powder (7) on adjacent flexible graphite papers (13) is attached to opposite sides, forming a graphite gasket (6) structure with vermiculite powder (7) on both sides and no vermiculite powder (7) in the middle; a plurality of columnar air grooves (12) are respectively opened on both sides of the graphite gasket (6); The cross sections of the annular groove (5) and the airbag strip (8) are both trapezoidal; There is a cavity inside the airbag strip (8), and a spring sheet (9) with a serpentine cross section is provided in the cavity, and both ends of the spring sheet (9) respectively abut against the obtuse angles of the trapezoidal cross section of the airbag strip (8); The spring sheet (9) is a carbon steel sheet, and the surface of the spring sheet (9) is coated with high-temperature resistant rubber.

2. A sealed sintering furnace according to claim 1, characterized in that: There is a cavity inside the cover door (2), and a heat-insulating layer (11) is provided in the cavity.

3. A sealed sintering furnace according to claim 2, characterized in that: The heat-insulating layer (11) is a multi-layer structure, comprising asbestos boards located at a bottom layer and a top layer respectively, with glass fiber floss being arranged between the two layers of the asbestos boards, and ceramic powder being adhered to the glass fiber floss via a high-temperature resistant pressure-sensitive adhesive.

4. A sealed sintering furnace according to claim 3, characterized in that: The ceramic powder is a porous microbead structure.

5. A sealed sintering furnace according to claim 4, characterized in that: The depth of the columnar air groove (12) provided on the graphite gasket (6) is 2 / 3 of the thickness of the graphite gasket (6).

6. A sealed sintering furnace according to claim 5, characterized in that: A heat-insulating cover (14) is provided on the side of the cover door (2), a concave surface is provided on the inner side of the heat-insulating cover (14), and the heat-insulating cover (14) and the front plate (1) are adsorbed by negative pressure.

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