Insulation support of degumming and sintering integrated furnace heating body

Abstract

The utility model relates to an insulating support of a degumming and sintering integrated furnace heating body, which comprises a heating body, a furnace body, a furnace pipe and an insulating support, the heating body is supported in the furnace pipe by the insulating support, and the bottom of the insulating support is mounted on the furnace body in an insulating manner to form the insulating support; the insulating support is a graphite support with an insulating protective sleeve and a double-sleeve structure, the graphite protective sleeve is arranged between the central supporting rod and the graphite sleeve, two gas isolation layers are formed between the central supporting rod and the graphite sleeve through the graphite protective sleeve, the inner gas isolation layer is a static gas circulation isolation layer, and the outer gas isolation layer is a static gas circulation isolation layer. And insulation damage between the central supporting rod and the graphite sleeve is prevented through the two gas isolation layers. According to the utility model, the graphite protection sleeve is arranged between the graphite sleeve and the central support rod to form an internal insulation isolation layer, and the air insulation isolation layer does not have gas flow and can play a good role in insulation.

Description

Technical Field

[0001] This utility model relates to the field of degumming sintering furnaces, and in particular to an insulating support component structure for the heating element of an integrated degumming sintering furnace. Background Technology

[0002] The debinding and sintering integrated furnace is a high-temperature processing equipment specifically designed for powder forming products such as ceramics and cemented carbide. It can complete both debinding and sintering processes within the same furnace. This equipment typically features high temperature control precision and uniformity, ensuring the quality of materials during both debinding and sintering. Since powder forming requires the addition of binders to enhance powder cohesion for easier forming and subsequent processing, a debinding step is necessary before firing. This involves holding the product at a specific temperature (e.g., 500℃) for a period to decompose and remove the binder, preventing residual organic matter from affecting product quality during sintering. While traditional vacuum sintering furnaces only required small batches of debinding and sintering powder forming products, with the advancement of technology, ceramic processing plants now require... The requirements for ceramic processing efficiency are also increasing, necessitating large-scale sintering and debinding in vacuum sintering furnaces. However, in current integrated vacuum debinding and sintering furnaces, the heating element is located inside the furnace chamber and supported by insulation. However, the existing insulation support channels are narrow, and the debinding gas flows through these channels. Because the debinding gas condenses in these narrow channels, blockages often occur, preventing the insulation channels from functioning properly. This leads to overheating and even burn-out of the heating element's insulation support. A search revealed no identical technical solutions to this invention; only some relevant comparative technical documents were found, including the following:

[0003] 1. Patent application number 202410723473.8 discloses a graphite crucible and a horizontal graphite reactor. The graphite crucible includes a crucible body, an insulation section, a heating element, and a support section. The crucible body has a central axis along a horizontal direction. The insulation section covers the outside of the crucible body, and the heating element covers the outside of the insulation section. The insulation section includes multiple layers of insulation concentrically stacked around the central axis of the crucible body, each insulation layer being compacted along the radial direction of the crucible body. The support section is located below the crucible body, with its bottom abutting against the heating element, and is embedded within the insulation section. The insulation layers are fixed in a compacted state. This patent does not solve the technical problem of the narrow insulation support channel of the heating element in a vacuum sintering furnace, which is often blocked by adhesive.

[0004] 2. Patent application number 202311569454.6 relates to the field of vacuum heating furnace technology, and in particular to a vacuum sintering furnace, comprising: a heating chamber, a heating element, and multiple baffles; wherein, the heating element is disposed on the inner wall of the heating chamber, and the heating mode of the heating element is linear radiation heating; multiple baffles are disposed in the heating chamber, and the multiple baffles are arranged to form a box with an opening at least one end along the length direction of the heating chamber, and the box is used to accommodate workpieces. The addition of a box surrounded by multiple baffles in the heating chamber, with the box acting as a secondary heating element to heat the entire workpiece area, can be seen as multiple heating plates heating the entire working area, i.e., the workpiece area. However, this patent does not solve the technical problem of the narrow insulation support channel of the heating element in the vacuum sintering furnace, which is often blocked by adhesive.

[0005] 3. Patent application number 201821993598.9 discloses a multi-layer combined heating element vacuum sintering furnace, including a vacuum chamber. An insulation sleeve is fixed to one end of the side wall of the vacuum chamber. A heating device is installed inside the insulation sleeve. Two support frames are fixed to the bottom of the vacuum chamber. Support rods are fixed to the upper ends of both support frames. One end of each support rod penetrates the side wall of the insulation sleeve and extends into the insulation sleeve. One end of each support rod is fixed to one side of the heating device. Electrodes are connected to the heating device. This patent does not solve the technical problem of the narrow insulation support channel of the heating element in the vacuum sintering furnace, which is often blocked by adhesive.

[0006] Analysis of the aforementioned patents reveals that current vacuum sintering furnaces do not consider the simultaneous sintering and binder removal within the furnace. Furthermore, the narrow insulation support channels of the heating element are frequently blocked by the binder. Therefore, the aforementioned problems persist, necessitating improvements. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide an insulating support for the heating element of an integrated degumming and sintering furnace, which effectively solves the technical problem that when sintering and degumming are carried out simultaneously in a vacuum sintering furnace, the insulating support channel of the heating element in the vacuum sintering furnace is narrow and is often blocked by degumming gas, thus failing to play an insulating role.

[0008] The technical solution proposed in this utility model is: an insulating support for the heating element of an integrated degumming and sintering furnace, comprising a heating element, a furnace body, a furnace liner, and an insulating support. The heating element is insulated within the furnace liner by the insulating support, and the bottom of the insulating support is insulatedly mounted on the furnace body to form the insulating support. The insulating support is a graphite support with a double-tube structure and an insulating protective sleeve. A graphite protective sleeve is provided between the central support rod and the graphite sleeve. The graphite protective sleeve forms two gas isolation layers between the central support rod and the graphite sleeve, and the inner gas isolation layer is a static gas flow isolation layer. The two gas isolation layers prevent the insulation between the central support rod and the graphite sleeve from being damaged.

[0009] Furthermore, the graphite protective sleeve is cylindrical, with a diameter larger than that of the central support rod but smaller than that of the graphite sleeve. The top surface of the graphite protective sleeve is higher than that of the graphite sleeve, and there is a gap between the top surface of the graphite protective sleeve and the top supporting graphite gasket. The bottom of the graphite protective sleeve extends outside the graphite sleeve and is inserted into the insulating pad fitted on the central support rod, so that a bottom-sealed annular inner gas isolation layer is formed between the central support rod and the graphite protective sleeve.

[0010] Furthermore, the central support rod is a long strip-shaped support rod. The top of the central support rod rests on the bottom of the graphite support pad supporting the heating element, and the bottom is inserted into the central hole of the graphite support rod. At the bottom of the central support rod, near the bottom of the graphite support rod, a ring-shaped boron nitride insulating pad with a boss is fitted. The central support rod passes through the central hole of the boron nitride insulating pad, while the graphite protective sleeve is fitted on the boss of the boron nitride insulating pad. The bottom support graphite pad is arranged between the graphite protective sleeve and the boron nitride insulating pad. The boron nitride insulating pad forms an insulating barrier between the central support rod and the graphite protective sleeve, and forms a bottom seal of the inner gas isolation layer.

[0011] Furthermore, the central support rod is a support rod made of carbon-carbon material or carbon-carbon composite material, including a support rod made of graphite or carbon fiber resin-based composite material.

[0012] Furthermore, an adjustment washer is provided between the graphite support rod and the boron nitride insulating pad. The height of the entire insulating support is adjusted by adjusting the adjustment washer to ensure that the insulating support can effectively support the heating element.

[0013] Furthermore, the bottom of the graphite support rod is inserted into the hole of the insulating alumina ring, which is then installed in the bottom mounting base connected to the furnace body, forming a fixed insulating support with the furnace body.

[0014] Furthermore, an external gas isolation gap is left between the graphite protective sleeve and the graphite sleeve, so that an external gas insulation isolation layer is formed between the graphite protective sleeve and the graphite sleeve; the gap of the external gas isolation layer is a vertical flow gap, so that the discharge gas can flow from top to bottom out of the furnace chamber and then be discharged out of the furnace body during vacuum discharge.

[0015] Furthermore, the graphite sleeve is a tubular body with the same shape as the graphite protective sleeve, but with a larger diameter than the graphite protective sleeve. It has a protruding part at the edge near the heating element, which is stuck on the inner shell of the furnace liner to facilitate the removal of the graphite sleeve.

[0016] Furthermore, the central support rod is circular or polygonal in shape, and the inner and outer shapes of the graphite protective sleeve and the graphite sleeve correspond to the shape of the central support rod, ensuring that there are gaps between the graphite protective sleeve and the central support rod, as well as between the graphite protective sleeve and the graphite sleeve, forming an external gas isolation layer and an internal gas isolation layer.

[0017] Furthermore, the bottom mounting base includes a sleeve that wraps around the insulating corundum pad 11. A bent support plate is provided below the sleeve. The bent support plate is hook-shaped and its bottom is attached to the arc-shaped furnace bottom. The sleeve and the bent support plate are fixedly connected together to form an integral structure.

[0018] The beneficial effects of this utility model are as follows: By setting a graphite protective sleeve between the central support rod and the graphite protective sleeve, and with the upper surface of the graphite protective sleeve being higher than the upper surface of the graphite sleeve, an internal air insulation layer is formed between the graphite protective sleeve and the central support rod, which is connected at one end and closed at the other. When the adhesive is discharged from the external air insulation layer between the graphite protective sleeve and the graphite sleeve, there is no gas flow due to the pressure difference. Because there is an open and connected air insulation between the graphite protective sleeve and the graphite sleeve, the hot air for discharging adhesive can only flow out through the gap in the air insulation between the graphite protective sleeve and the graphite sleeve. Therefore, even if the external air insulation layer is blocked by the condensation of the adhesive discharge gas, the insulation between the graphite sleeve and the central support rod can still be maintained, thereby avoiding the insulation failure of the entire insulation support and playing a good insulation role. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the vacuum debinding and sintering integrated furnace including the insulating support of this utility model;

[0020] Figure 2 This is a schematic diagram of the insulating support structure of the heating element of the vacuum debinding and sintering integrated furnace provided in this embodiment of the utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Top support graphite gasket; 2. Center support rod; 3. Graphite protective sleeve; 4. Graphite sleeve; 5. Bottom support graphite gasket; 6. Boron nitride insulating pad; 7. Height adjustment washer; 8. Graphite support rod; 9. Support positioning ring; 10. Insulating corundum ring; 11. Insulating corundum pad; 12. Bending support plate; 13. Furnace body; 14. Furnace liner; 15. Heating element; 16. Insulating support; 17. Insulation layer. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0024] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] like Figure 1As shown, an insulating support for the heating element of an integrated degumming and sintering furnace includes a heating element 15, a furnace body 13, a furnace liner 14, and an insulating support 16. The heating element 15 is supported inside the furnace liner 14 by the insulating support 16. The bottom of the insulating support 16 is insulatedly mounted on the furnace body 13 to form the insulating support 16. The insulating support 16 is a graphite support with a double-tube structure and an insulating protective sleeve. A graphite protective sleeve 3 is provided between the central support rod 2 and the graphite sleeve 4. The graphite protective sleeve 3 forms two gas isolation layers between the central support rod 2 and the graphite sleeve 4, and the inner gas isolation layer is a static gas flow isolation layer. The two gas isolation layers prevent the insulation between the central support rod 2 and the graphite sleeve 4 from being damaged.

[0026] Furthermore, the graphite protective sleeve 3 is cylindrical, with a diameter larger than that of the central support rod 2 and smaller than that of the graphite sleeve 4. The top surface of the graphite protective sleeve 3 is higher than that of the graphite sleeve 4, and there is a gap between the top surface of the graphite protective sleeve 3 and the top supporting graphite gasket 1. The bottom of the graphite protective sleeve 3 extends outside the graphite sleeve 4 and is inserted into the insulating pad fitted on the central support rod 2, so that a bottom-sealed annular inner gas isolation layer is formed between the central support rod 2 and the graphite protective sleeve 3.

[0027] Furthermore, the central support rod 2 is a long strip-shaped support rod. The top of the central support rod 2 rests below the top support graphite pad 1 of the supporting heating element 15, and the bottom is inserted into the central hole of the graphite support rod 8. A ring-shaped boron nitride insulating pad 6 with a boss is fitted at the bottom of the central support rod 2 near the bottom of the graphite support rod 8. The central support rod 2 passes through the central hole of the boron nitride insulating pad 6, while the graphite protective sleeve 3 is fitted above the boss of the boron nitride insulating pad 6. The bottom support graphite pad 5 is arranged between the graphite protective sleeve and the boron nitride insulating pad 6. The boron nitride insulating pad 6 forms an insulating barrier between the central support rod 2 and the graphite protective sleeve 3, and forms a bottom seal of the inner gas isolation layer.

[0028] Furthermore, the central support rod 2 is a support rod made of carbon-carbon material or carbon-carbon composite material, including a support rod made of graphite or carbon fiber resin-based composite material.

[0029] Furthermore, an adjustment washer 7 is provided between the graphite support rod 8 and the boron nitride insulating pad 6. The height of the entire insulating support 16 is adjusted by adjusting the adjustment washer 7 to ensure that the insulating support 16 can effectively support the heating element 15.

[0030] Furthermore, the bottom of the graphite support rod 8 is inserted into the hole of the insulating corundum ring 10, which is then installed in the bottom mounting base connected to the furnace body 13, forming a fixed insulating support 16 with the furnace body 13.

[0031] Furthermore, an external gas isolation gap is left between the graphite protective sleeve 3 and the graphite sleeve 4, so that an external gas insulation isolation layer is formed between the graphite protective sleeve 3 and the graphite sleeve 4; the gap of the external gas isolation layer is an upper and lower flow gap, so that the glue discharge gas can flow from top to bottom out of the furnace liner 14 and then out of the furnace body 13 when vacuuming and discharging the glue.

[0032] Furthermore, the graphite sleeve 4 is a tubular body with the same shape as the graphite protective sleeve 3, but with a larger diameter than the graphite protective sleeve 3. It has a protruding part at one end near the heating element 15, which is stuck on the inner shell of the furnace liner 14, making it easy to remove the graphite sleeve 4.

[0033] Furthermore, the central support rod 2 is circular or polygonal in shape, and the inner and outer shapes of the graphite protective sleeve 3 and graphite sleeve 4 correspond to the shape of the central support rod 2, ensuring that there are gaps between the graphite protective sleeve 3 and the central support rod 2, as well as between the graphite protective sleeve 3 and the graphite sleeve 4, forming an external gas isolation layer and an internal gas isolation layer.

[0034] Furthermore, the bottom mounting base includes a sleeve that wraps around the insulating corundum pad 11. A bent support plate 12 is provided below the sleeve. The bent support plate 12 is hook-shaped and its bottom fits the arc-shaped furnace bottom. The sleeve and the bent support plate 12 are fixedly connected together to form an integral structure.

[0035] In this embodiment, the adhesive dispensing process is as follows: When the heating element 15 of the vacuum sintering furnace fires the ceramic, the previously added adhesive evaporates into the hot air. There is an air insulation between the central support rod 2 of the heating element insulating support 16 and the graphite protective sleeve 3, which is connected at one end and closed at the other end. There is no gas flow in this air insulation. Moreover, the upper surface of the graphite protective sleeve 3 is higher than the upper surface of the graphite sleeve 4. There is an open air insulation between the graphite protective sleeve 3 and the graphite sleeve 4. The hot air dispensing the adhesive can only flow out through the gap in the air insulation between the graphite protective sleeve 3 and the graphite sleeve 4. The air insulation between the central support rod 2 and the graphite protective sleeve 3 can play a good insulating role.

[0036] The beneficial effects of this utility model are as follows: By setting a graphite protective sleeve 3 between the central support rod 2 and the graphite sleeve 4, and with the upper surface of the graphite protective sleeve 3 being higher than the upper surface of the graphite sleeve 4, an internal air insulation layer is formed between the graphite protective sleeve 3 and the central support rod 2, which is connected at one end and closed at the other. When the adhesive discharge gas is discharged from the external air insulation layer between the graphite protective sleeve 3 and the graphite sleeve 4, there is no gas flow due to the pressure difference. Since there is an open and connected air insulation between the graphite protective sleeve 3 and the graphite sleeve 4, the hot air for adhesive discharge can only flow out through the gap in the air insulation between the graphite protective sleeve 3 and the graphite sleeve 4. Therefore, even if the external air insulation layer is blocked by the condensation of the adhesive discharge gas, the insulation between the graphite sleeve 4 and the central support rod 2 can still be maintained, thereby avoiding the insulation failure of the entire insulating support 16 and playing a good insulating role.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An insulating support for the heating element of an integrated degumming and sintering furnace, characterized in that: The furnace includes a heating element (15), a furnace body (13), a furnace liner (14), and an insulating support (16). The heating element (15) is supported in the furnace liner (14) by the insulating support (16). The bottom of the insulating support (16) is insulatedly installed on the furnace body (13) to form the insulating support (16). The insulating support (16) is a graphite support with a double-tube structure and an insulating protective sleeve. A graphite protective sleeve (3) is provided between the central support rod (2) and the graphite sleeve (4). The graphite protective sleeve (3) forms two gas isolation layers between the central support rod (2) and the graphite sleeve (4). The inner gas isolation layer is a static gas flow isolation layer. The two gas isolation layers prevent the insulation between the central support rod (2) and the graphite sleeve (4) from being damaged.

2. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 1, characterized in that: The graphite protective sleeve (3) is a cylindrical tube with a diameter greater than that of the central support rod (2) and smaller than that of the graphite sleeve (4). The top surface of the graphite protective sleeve (3) is higher than that of the graphite sleeve (4), and there is a gap between the top surface of the graphite protective sleeve (3) and the top support graphite pad (1). The bottom of the graphite protective sleeve (3) extends outside the graphite sleeve (4) and is inserted into the insulating pad fitted on the central support rod (2), so that a bottom-sealed annular inner gas isolation layer is formed between the central support rod (2) and the graphite protective sleeve (3).

3. The insulating support for the heating element of a degumming sintering integrated furnace according to claim 2, characterized in that: The central support rod (2) is a long strip support rod. The top of the central support rod (2) rests on the graphite pad (1) supporting the top of the heating element (15) and is inserted into the central hole of the graphite support rod (8). A ring-shaped boron nitride insulating pad (6) with a boss is fitted at the bottom of the central support rod (2) near the bottom of the graphite support rod (8). The central support rod (2) passes through the central hole of the boron nitride insulating pad (6), while the graphite protective sleeve (3) is fitted on the boss of the boron nitride insulating pad (6). The bottom support graphite pad (5) is arranged between the graphite protective sleeve and the boron nitride insulating pad (6). The boron nitride insulating pad (6) makes the central support rod (2) and the graphite protective sleeve (3) form an insulating isolation and form the bottom seal of the inner gas isolation layer.

4. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 3, characterized in that: An adjustment washer (7) is provided between the graphite support rod (8) and the boron nitride insulating pad (6). The height of the entire insulating support (16) is adjusted by adjusting the adjustment washer (7) to ensure that the insulating support (16) can effectively support the heating element (15).

5. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 3, characterized in that: The bottom of the graphite support rod (8) is inserted into the hole of the insulating alumina ring (10), which is then installed in the bottom mounting base connected to the furnace body (13), forming a fixed insulating support (16) with the furnace body (13).

6. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 1, characterized in that: The central support rod (2) is a support rod made of carbon-carbon material or carbon-carbon composite material, including a support rod made of graphite or carbon fiber resin-based composite material.

7. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 1, characterized in that: An external gas isolation gap is left between the graphite protective sleeve (3) and the graphite sleeve (4), so that an external gas insulation isolation layer is formed between the graphite protective sleeve (3) and the graphite sleeve (4); the gap of the external gas isolation layer is an upper and lower flow gap, so that the discharge gas can flow from top to bottom out of the furnace liner (14) during vacuum discharge, and then be discharged out of the furnace body (13).

8. The insulating support for the heating element of the degumming sintering integrated furnace according to claim 7, characterized in that: The graphite sleeve (4) is a tubular body with the same shape as the graphite protective sleeve (3), and its diameter is larger than that of the graphite protective sleeve (3). There is a protruding part on the edge near the heating element (15), and the protruding part is stuck on the inner shell of the furnace (14), making it easy to remove the graphite sleeve (4).

9. The insulating support for the heating element of a degumming sintering integrated furnace according to claim 7, characterized in that: The central support rod (2) is circular or polygonal in shape. The inner and outer shapes of the graphite protective sleeve (3) and the graphite sleeve (4) correspond to the shape of the central support rod (2), ensuring that there are gaps between the graphite protective sleeve (3) and the central support rod (2), as well as between the graphite protective sleeve (3) and the graphite sleeve (4), forming an external gas isolation layer and an internal gas isolation layer.

10. The insulating support for the heating element of a degumming sintering integrated furnace according to claim 5, characterized in that: The bottom mounting base includes a sleeve that wraps around an insulating corundum pad (11). A bent support plate (12) is provided below the sleeve. The bent support plate (12) is hook-shaped and its bottom fits the arc-shaped furnace bottom. The sleeve and the bent support plate (12) are fixedly connected together to form an integral structure.

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