An electric limit insulation type ultra-high temperature vacuum sintering furnace

Abstract

The present invention proposes an electric limit insulation type ultra-high temperature vacuum sintering furnace, comprising a furnace body and an electrode assembly arranged on the furnace body, the furnace body comprising a furnace drum, a heat shield, and a heater, the electrode assembly comprising an electrode, an insulating member, and a locking member, the electrode comprising an outer section, a sealing section, and an inner section connected in sequence from the outside to the inside, the locking member being connected to the end of the outer section, the inner section being engaged with the side wall of the furnace drum, the insulating member being engaged between the sealing section and the through hole of the furnace drum to insulate the electrode from the furnace drum, the insulating member being an insulator, the present invention sandwiches an insulating member between the sealing section of the electrode and the furnace drum, and after being sleeved on the outer wall of the sealing section, it is also in mechanical contact with the furnace drum, so that not only can the non-contact gap between the two be reduced to avoid residual air or impurities during vacuuming, but it can also serve as a mechanical contact between the two to enhance the stability of the connection between the two, and the through hole passing through the electrode can also be blocked to enhance the sealing between the electrode and the furnace drum to avoid pressure release.

Description

Technical Field

[0001] This invention relates to the field of ultra-high temperature sintering furnace technology, and in particular to an electrically limiting insulated ultra-high temperature vacuum sintering furnace. Background Art

[0002] In the industry, sintering furnaces are divided into high-temperature vacuum sintering furnaces and ultra-high-temperature vacuum sintering furnaces. Usually, when the sintering temperature reaches 1000°C, it is a high-temperature vacuum sintering furnace, and when it reaches 1900°C, it is an ultra-high-temperature vacuum sintering furnace. The sintering furnace in this patent can reach a temperature of 2600°C, which is an excellent ultra-high-temperature vacuum sintering furnace.

[0003] Ultra-high-temperature sintering furnaces have strict requirements for vacuum and temperature during sintering, and the sealing of the furnace body is a key factor affecting these requirements. Electrodes are installed through the furnace barrel, and the through-holes in the barrel create a weak point for pressure relief and are also prone to electrical leakage. Summary of the Invention

[0004] It is necessary to propose an electric limit potential insulated ultra-high temperature vacuum sintering furnace.

[0005] An electrically limit-insulated ultra-high temperature vacuum sintering furnace includes a furnace body and an electrode assembly mounted on the furnace body. The furnace body includes a furnace cylinder, a heat shield, and a heater. The heater is located inside the heat shield, which is located inside the furnace cylinder. A through hole is also formed in the furnace cylinder. The electrode assembly includes an electrode, an insulating component, and a locking component. The electrode is an elongated component, including an outer section, a sealing section, and an inner section connected sequentially from the outside to the inside. The sealing section is located inside the through hole of the furnace cylinder. The locking component is connected to the end of the outer section, and the inner section is engaged with the side wall of the furnace cylinder. The inner end of the electrode is located inside the furnace cylinder, and the outer end is located outside the furnace cylinder. The insulating component is engaged between the sealing section and the through hole of the furnace cylinder to insulate the electrode from the furnace cylinder. The insulating component is an insulator.

[0006] Preferably, the locking element is threaded to the end of the outer section, and the outer diameter of the inner section is larger than the diameter of the sealing section, so that the sealing section is restricted to the through hole of the furnace cylinder by the locking element and the inner section.

[0007] Preferably, the insulating part includes several flexible insulating rings and hard insulating rings, the flexible insulating ring is a sealing ring, and the hard insulating ring is a hollow circular ring. The flexible insulating ring and the hard insulating ring are arranged side by side at intervals, and the length of the several flexible insulating rings and the hard insulating rings when arranged side by side covers the length of the sealing section.

[0008] Preferably, the insulating component further includes an outer insulating ring and an inner insulating ring, with the outer insulating ring disposed between the locking component and the furnace cylinder, and the inner insulating ring disposed between the inner end face and the furnace cylinder.

[0009] Preferably, the outer insulating ring and the inner insulating ring are T-shaped sleeves.

[0010] Preferably, the diameter of the inner section is larger than the diameter of the sealing section, so that a stepped structure is formed between the outer section and the sealing section for engaging with the furnace cylinder sidewall.

[0011] Preferably, the electrode assembly also includes a water-cooling part, which includes a water-cooling pipe and a tee joint. A cooling long hole is also opened inside the electrode. The cooling long hole is connected to the outer end of the electrode and extends inward along the axial direction of the electrode length to near the inner end. The cooling long hole is not connected to the inner end. One end of the water-cooling pipe is inserted into the end of the cooling long hole, and the diameter of the water-cooling pipe is smaller than the inner diameter of the cooling long hole, so that a channel for water reflux is separated between the water-cooling pipe and the cooling long hole. The tee joint is arranged at the end of the outer section of the electrode, and one joint of the tee joint is connected to the cooling long hole of the end of the outer section of the electrode, so that the water-cooling pipe can pass through the joint from the other joint of the tee joint and enter the cooling long hole. The third joint of the tee joint is connected to the inside of the cooling long hole to discharge the refluxed water.

[0012] Preferably, the cooling elongated hole is eccentrically positioned, and a stepped surface for docking with the heater is also provided on the inner end sidewall of the electrode. The cooling elongated hole extends below the stepped surface to cool the stepped surface and the heater connected thereon.

[0013] In this solution, an insulating member is sandwiched between the sealing section of the electrode and the furnace drum. The insulating member itself is made of insulating material and, after being sleeved on the outer wall of the sealing section, is also in mechanical contact with the furnace drum. This not only reduces the non-contact gap between the two and avoids residual air or impurities during vacuuming, but also serves as mechanical contact between the two, enhancing the stability of the connection between the two. It can also seal the through hole passing through the electrode, thereby enhancing the sealing between the electrode and the furnace drum and avoiding pressure release. Attached Figure Description

[0014] Figure 1 Schematic diagram of an electric limit insulation ultra-high temperature vacuum sintering furnace.

[0015] Figure 2 , 3 Schematic diagrams of the main view and left view of the electrode.

[0016] Figure 4 for Figure 3 A cross-sectional view along AA.

[0017] Figure 5 This is a schematic diagram of the insulation components in their compressed and sealed state. In particular, it shows how the flexible insulation ring deforms under pressure to compensate for or fill in the poor contact between the adjacent hard components and the furnace drum and electrodes.

[0018] Figure 6Schematic diagram of the sealed connection between the electrode and the furnace drum in the prior art.

[0019] Figure 7 This is a schematic diagram of electrodes in the prior art.

[0020] In the figure: Furnace body 10, furnace cylinder 11, heat shield 12, heater 13, electrode assembly 20, electrode 21, outer section 211, sealing section 212, inner section 213, insulating component 22, flexible insulating ring 221, rigid insulating ring 222, outer side insulating ring 223, inner side insulating ring 224, stepped surface 225, locking component 23, water cooling component 24, water cooling pipe 241, tee connector 242. DETAILED DESCRIPTION

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] See also Figure 1-5 This invention provides an electrically limit-displacement-insulated ultra-high temperature vacuum sintering furnace, including a furnace body 10 and an electrode assembly 20 disposed on the furnace body 10. The furnace body 10 includes a furnace cylinder 11, a heat shield 12, and a heater 13. The heater 13 is disposed inside the heat shield 12, which is disposed inside the furnace cylinder 11. A through hole is also formed in the furnace cylinder 11. The electrode assembly 20 includes an electrode 21, an insulating component 22, and a locking component 23. The electrode 21 is an elongated component, including components connected sequentially from the outside to the inside. The furnace 11 consists of an outer section 211, a sealing section 212, and an inner section 213. The sealing section 212 is located inside the through hole of the furnace cylinder 11. The locking member 23 is connected to the end of the outer section 211, and the inner section 213 is engaged with the side wall of the furnace cylinder 11. The inner end of the electrode 21 is located inside the furnace cylinder 11, and the outer end is located outside the furnace cylinder 11. The insulating member 22 is engaged between the sealing section 212 and the through hole of the furnace cylinder 11 to insulate the electrode 21 from the furnace cylinder 11. The insulating member 22 is an insulator.

[0023] In the original design, no insulating member 22 is provided between the through hole of the furnace drum 11 and the outer wall of the electrode 21. The electrode 21 and the furnace drum 11 are fixedly connected by bolts between the electrode 21 and the side wall of the furnace drum 11, and the electrode 21 is kept from contacting the inner wall of the through hole. A fixed gap is retained, and this gap serves as gap insulation to prevent leakage caused by contact between the electrode 21 and the furnace drum 11. This design has several drawbacks: 1. To maintain insulation, a gap must be maintained between electrode 21 and furnace cylinder 11. When vacuuming is required after loading, air or impurities may remain in this area. This could lead to a slow release of vacuum within the furnace body 10, failing to meet the preset requirements, or impurities could connect electrode 21 and furnace cylinder 11, causing leakage. 2. Since electrode 21 is fixed to furnace cylinder 11 via a front locking nut and a rear bolt, the middle section of electrode 21 is suspended from furnace cylinder 11 without contact support. If the external locking nut loosens, electrode 21 may shake or shift, contacting furnace cylinder 11 and causing leakage. See also... Figure 6 , 7 .

[0024] In this solution, an insulating member 22 is sandwiched between the sealing section 212 of the electrode 21 and the furnace drum 11. The insulating member 22 itself is made of insulating material, and after being sleeved on the outer wall of the sealing section 212, it is also in mechanical contact with the furnace drum 11. This not only reduces the non-contact gap between the two and avoids residual air or impurities during vacuuming, but also serves as mechanical contact between the two, enhancing the stability of the connection between the two.

[0025] Furthermore, the locking member 23 is threaded to the end of the outer section 211, and the outer diameter of the inner section 213 is larger than the diameter of the sealing section 212, so that the sealing section 212 is restricted to the through hole of the furnace cylinder 11 by the locking member 23 and the inner section 213.

[0026] Furthermore, the insulating part 22 includes several flexible insulating rings 221 and hard insulating rings 222. The flexible insulating ring 221 is a sealing ring made of rubber material, and the hard insulating ring 222 is a hollow circular ring made of resin material or glass fiber material. The flexible insulating ring 221 and the hard insulating ring 222 are arranged side by side at intervals, and the length of the several flexible insulating rings 221 and the hard insulating rings 222 when arranged side by side covers the length of the sealing section 212.

[0027] Several flexible insulating rings 221 and rigid insulating rings 222 are fitted onto the sealing section 212, essentially covering the sealing section 212 along its length. This leaves almost no empty space or gap between the sealing section 212 and the furnace cylinder 11, thus reducing the porosity between the electrode 21 and the furnace cylinder 11. During vacuuming, there is virtually no space for residual air or impurities, avoiding the problems of existing technologies. Furthermore, the relatively long flexible insulating rings 221 and rigid insulating rings 222 also provide mechanical support between the electrode 21 and the furnace cylinder 11, further enhancing the stability between them. Even if the external locking nut loosens, there is no risk of contact leakage between the two.

[0028] This solution has advantages over the solution of using a long hollow insulating cylinder fitted on the sealing section 212 for insulation. In this solution, separate elements (flexible insulating ring 221 and rigid insulating ring 222) are arranged side by side to form a long insulator. If a single element is damaged, it can be replaced individually, reducing the cost of consumables. Moreover, the flexible insulating ring and the rigid insulating ring are set alternately. When the rigid insulating ring 222 has poor contact with the furnace cylinder 11 and the electrode 21, the flexible element can deform itself to compensate for or fill the poor contact between the adjacent rigid element and the furnace cylinder 11 and the electrode 21, resulting in a better sealing effect.

[0029] Furthermore, the insulating member 22 also includes an outer insulating ring 223 and an inner insulating ring 224. The outer insulating ring 223 is disposed between the locking member 23 and the furnace cylinder 11, and the inner insulating ring 224 is disposed between the end face of the inner section 213 and the furnace cylinder 11.

[0030] Furthermore, the outer insulating ring 223 and the inner insulating ring 224 are T-shaped sleeves.

[0031] Furthermore, the diameter of the inner section 213 is larger than the diameter of the sealing section 212, so that a stepped step is formed between the outer section 211 and the sealing section 212 for engaging with the side wall of the furnace cylinder 11.

[0032] Furthermore, the electrode assembly 20 also includes a water-cooling component 24, which includes a water-cooling pipe 241 and a three-way connector 242. A cooling elongated hole is also formed inside the electrode 21, which is connected to the outer end of the electrode 21 and extends inward along the axial direction of the electrode 21 to near the inner end. The cooling elongated hole is not connected to the inner end. One end of the water-cooling pipe 241 is inserted into the end of the cooling elongated hole, and the diameter of the water-cooling pipe 241 is smaller than the inner diameter of the cooling elongated hole, so that there is a channel for water to flow back between the water-cooling pipe 241 and the cooling elongated hole. The three-way connector 242 is set at the end of the outer section 211 of the electrode 21. One connector of the three-way connector 242 is connected to the cooling elongated hole at the end of the outer section 211 of the electrode 21, so that the water-cooling pipe 241 can pass through the connector and enter the cooling elongated hole from the other connector of the three-way connector 242. The third connector of the three-way connector 242 is connected to the inside of the cooling elongated hole to discharge the water that has flowed back.

[0033] Furthermore, the cooling elongated hole is eccentrically positioned, meaning its axis does not coincide with the axis of electrode 21. A stepped surface 225 for docking with heater 13 is also provided on the inner end sidewall of electrode 21. The cooling elongated hole extends below the stepped surface 225 to cool the stepped surface 225 and the heater 13 connected thereon. The heater 13, located within the heat shield 12, is connected to electrode 21 via a transition connector; for example, in this design, the connector connected to the stepped surface 225 is the transition connector.

[0034] In this design, to increase the contact area between electrode 21 and heater 13, the surface area of ​​the stepped surface 225 needs to be increased. This occupies a certain surface area on electrode 21, and the contact area experiences severe heat generation. To cool this area, the water-cooling pipe 241 needs to be extended to this location. However, in the prior art, the cooling elongated hole is located on the axis of electrode 21. The position occupied by the stepped surface 225 results in a smaller remaining cross-section of electrode 21, preventing the cooling elongated hole from extending further below the stepped surface 225. Consequently, the section of electrode 21 with the stepped surface 225 cannot be cooled, leading to high temperatures and severe heat generation.

[0035] The modules or units in the device of this invention can be merged, divided, or deleted according to actual needs.

[0036] The above-disclosed embodiments are merely preferred embodiments of this patent document and should not be construed as limiting the scope of the invention. Furthermore, the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments, and equivalent variations made according to the claims of this invention, still fall within the scope of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0037] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An electric limit insulation type ultra-high temperature vacuum sintering furnace, characterized in that: The invention comprises a furnace body and an electrode assembly arranged on the furnace body, wherein the furnace body comprises a furnace barrel, a heat shield, and a heater, wherein the heater is arranged inside the heat shield, the heat shield is arranged inside the furnace barrel, and a through hole is also provided on the furnace barrel, wherein the electrode assembly comprises an electrode, an insulating member, and a locking member, wherein the electrode is an elongated member, comprising an outer section, a sealing section, and an inner section connected in sequence from the outside to the inside, wherein the sealing section is located in the through hole of the furnace barrel, the locking member is connected to the end of the outer section, the inner section is engaged with the side wall of the furnace barrel, the inner end head of the electrode is located inside the furnace barrel, the outer end head is located outside the furnace barrel, the insulating member is engaged between the sealing section and the through hole of the furnace barrel to insulate the electrode from the furnace barrel, and the insulating member is an insulator; the electrode assembly also comprises a water-cooling member, wherein the water-cooling member comprises a water-cooling pipe and a three-way joint, and a cooling long hole is also provided inside the electrode, the cooling long hole is connected with the outer end head of the electrode, extends inwardly along the axial direction of the electrode length to near the inner end head, the cooling long hole is not connected with the inner end head, and the water-cooling pipe One end of the electrode is inserted into the end of the cooling long hole, and the diameter of the water-cooling pipe is smaller than the inner diameter of the cooling long hole, so that a channel for water reflux is spaced between the water-cooling pipe and the cooling long hole, and the three-way joint is arranged at the end of the outer section of the electrode, and one joint of the three-way joint is connected with the cooling long hole at the end of the outer section of the electrode, so that the water-cooling pipe can be inserted from another joint of the three-way joint through the joint and enter the cooling long hole, and the third joint of the three-way joint is connected with the inside of the cooling long hole to discharge the refluxed water; the cooling long hole is eccentrically arranged, and a step surface for docking with the heater is also arranged on the side wall of the inner end of the electrode, and the cooling long hole extends to the bottom of the step surface to cool the step surface and the heater connected thereto; the insulating member includes a plurality of flexible insulating rings and a hard insulating ring, the flexible insulating ring is a sealing ring, and the hard insulating ring is a hollow circular ring body, the flexible insulating ring and the hard insulating ring are arranged side by side and spaced apart, and the length of the plurality of flexible insulating rings and the hard insulating rings after being arranged side by side covers the length of the sealing section.

2. The electric limit insulation type ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: The locking piece is threadedly connected to the end of the outer section, and the outer diameter of the inner section is larger than the diameter of the sealing section, so that the sealing section is restricted on the through hole of the furnace drum through the locking piece and the inner section.

3. The electric limit insulation type ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: The insulating member further comprises an outer insulating ring and an inner insulating ring. The outer insulating ring is arranged between the locking member and the furnace drum, and the inner insulating ring is arranged between the end surface of the inner section and the furnace drum.

4. The electric limit insulation type ultra-high temperature vacuum sintering furnace according to claim 3, characterized in that: The outer side insulating ring and the inner side insulating ring are T-shaped sleeves.

5. The electric limit insulation type ultra-high temperature vacuum sintering furnace according to claim 1, characterized in that: The diameter of the inner section is greater than the diameter of the sealing section, so that a step is formed between the outer section and the sealing section for engaging with the side wall of the furnace drum.

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