Explosion-proof vacuum furnace insulation terminal

Abstract

The application provides an explosion-proof vacuum furnace insulation terminal, belonging to the technical field of electrical introduction components of vacuum furnaces, which comprises a copper electrode for transmitting current, an insulation component comprising an insulation sleeve and two insulation caps, the insulation sleeve is sleeved on the outside of the copper electrode to realize electrical isolation between the copper electrode and an external metal shell, and the two insulation caps are arranged at the two ends of the insulation sleeve to form a double-layer insulation wrapping structure; complete electrical isolation between the copper electrode and the terminal body is realized, the creeping and short circuit phenomena are effectively prevented, the insulation sleeve is made of alumina ceramic or high-temperature-resistant polyimide material, has good high-temperature resistance, is not prone to aging and cracking under high-temperature working conditions, the risk of arc discharge and explosion caused by insulation failure is avoided, and the use safety of the terminal in the vacuum furnace environment is improved.

Description

Technical Field

[0001] This invention relates to the field of electrical input components for vacuum furnaces, and specifically to an explosion-proof insulating terminal block for vacuum furnaces. Background Technology

[0002] In special industrial equipment such as vacuum sintering furnaces and high-temperature atmosphere furnaces, the furnace is in a high-temperature, vacuum, or flammable atmosphere environment. As the connection component between the heating element inside the furnace and the external power supply, the electrical terminals must simultaneously meet core requirements such as insulation, vacuum sealing, high temperature resistance, and explosion-proof safety. The reliability of the terminals directly affects the operational safety and service life of the equipment.

[0003] Currently, the existing vacuum furnace terminals on the market generally have the following defects: First, the sealing fit between the insulation material and the metal shell is poor, which can easily lead to air leakage and creepage when the vacuum pressure fluctuates, affecting the vacuum level of the equipment; Second, the insulation layer is prone to aging and cracking under high-temperature conditions, which can cause short circuits or arc discharges, posing an explosion risk and making it difficult to meet explosion-proof safety standards; Third, the structure is complex, with the insulation components and the shell mostly being integrated into one package, making disassembly and maintenance difficult. Once the internal insulation fails or the electrodes are damaged, the entire unit needs to be replaced, resulting in high maintenance costs and making it difficult to meet the requirements for long-term stable operation of vacuum furnaces.

[0004] Therefore, there is an urgent need for a vacuum furnace insulating terminal block that is structurally reliable, has excellent insulation performance, combines explosion-proof and sealing functions, and is easy to maintain. Summary of the Invention

[0005] In view of this, the present invention provides an explosion-proof vacuum furnace insulating terminal block to solve the technical problems of poor sealing fit between the insulating material and the metal shell, easy leakage and creepage when the vacuum pressure fluctuates, easy aging and cracking of the insulation layer at high temperature leading to short circuit or arc discharge and explosion risk, and complex structure and difficult disassembly and maintenance in the prior art.

[0006] To solve the above problems, the explosion-proof vacuum furnace insulating terminal provided by the present invention adopts the following technical solution: including: copper electrodes, which are used to transmit current; An insulating component includes an insulating sleeve and two insulating caps. The insulating sleeve is fitted over the outside of the copper electrode to achieve electrical isolation between the copper electrode and the outer metal shell. The two insulating caps are respectively disposed at both ends of the insulating sleeve to form a double-layer insulating wrapping structure. The terminal block is fitted over the outside of the insulating component to accommodate and protect the insulating component. Two fastening plugs are threaded to both ends of the terminal block to press the insulating component. A body flange and a mounting flange are fixedly connected to the middle of the terminal block. An annular groove is provided on the top of the body flange, and a sealing ring is provided in the annular groove to achieve a vacuum seal with the furnace wall. The protective component includes a first protective shell and a second protective shell, which are fitted onto the outer surface of the terminal block to form external protection. A positioning block is fixedly connected to one side of the first protective shell. A positioning groove adapted to the positioning block is provided at the connection between the second protective shell and the first protective shell for quick positioning and installation. A retaining strip is fixed to the connection surface between the first and second protective shells and the terminal block. A retaining groove adapted to the retaining strip is provided on the outer surface of the terminal block to increase the tightness of the connection surface.

[0007] Furthermore, the body flange is fixedly connected to the outer surface of the terminal block, the mounting flange is sleeved on the outer surface of the terminal block, the body flange and the mounting flange are concentrically arranged, and both have threaded holes on their outer surfaces for bolts to pass through, for installing the terminal block as a whole onto the furnace wall.

[0008] Furthermore, boron nitride connectors are fixedly connected to both ends of the copper electrode. The boron nitride connectors are used to connect to the heating elements inside the furnace and the external power supply. They have both high temperature resistance and insulation properties. The two fastening plugs press and fix the boron nitride connectors to both ends of the copper electrode.

[0009] Furthermore, the insulating sleeve is made of alumina ceramic or high-temperature resistant polyimide, and the insulating cap and the insulating sleeve together form a complete insulating isolation layer to prevent creepage and short circuit between the copper electrode and the terminal block.

[0010] Furthermore, a locking plate is fixedly connected at the connection between the first protective shell and the second protective shell, and the two locking plates are fixedly connected by locking bolts.

[0011] Furthermore, both the terminal block and the fastening plug are made of 304 stainless steel to form a closed explosion-proof shell, blocking the internal electric arc from propagating outward. The insulating component and the terminal block are fitted with an interference fit, forming a double sealing structure with the sealing ring.

[0012] Furthermore, both ends of the terminal block are provided with threaded grooves, and the inner walls of the two fastening plugs are provided with threaded protrusions that are adapted to the threaded grooves. The terminal block and the fastening plugs are connected by threaded grooves and threaded protrusions.

[0013] The beneficial effects are: 1. This invention forms a double-layer insulating structure by setting a copper electrode, an insulating sleeve, and an insulating cap. The insulating sleeve is fitted over the copper electrode and sealed at both ends by the insulating cap, achieving complete electrical isolation between the copper electrode and the terminal block, effectively preventing creepage and short circuits. The insulating sleeve is made of alumina ceramic or high-temperature resistant polyimide, which has good high-temperature resistance and is not prone to aging and cracking under high-temperature conditions, avoiding the risk of arc discharge and explosion caused by insulation failure, and improving the safety of the terminal block in the vacuum furnace environment.

[0014] 2. This invention achieves reliable vacuum sealing by setting up a main flange, a mounting flange, and a sealing ring. The sealing ring is set in the annular groove of the main flange. During installation, the mounting flange presses against the main flange, so that the sealing ring fits tightly against the furnace wall. Combined with the interference fit between the insulating components and the terminal block, a double sealing structure is formed, which effectively solves the problem of air leakage when the vacuum pressure fluctuates. By setting up the terminal block made of stainless steel and the fastening plug, a closed explosion-proof shell is formed, which can block the outward propagation even if an internal arc discharge occurs. By setting up a removable first and second protective shell, it is easy to replace and maintain the internal insulating components and copper electrodes without disassembling the furnace body, thus reducing maintenance costs. Attached Figure Description

[0015] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the first protective shell structure of the present invention.

[0016] Explanation of reference numerals in the attached figures: 100. Copper electrode; 101. Boron nitride connector; 200. Insulating sleeve; 201. Insulating plug; 300. Terminal block; 301. Threaded groove; 302. Threaded protrusion; 400. Fastening plug; 500. Body flange; 501. Threaded hole; 600. Mounting flange; 700. Sealing ring; 800. Annular groove; 900. First protective shell; 901. Second protective shell; 902. Positioning block; 903. Positioning groove; 904. Locking strip; 905. Locking groove; 906. Locking plate; 907. Locking bolt. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] The basic concept of this invention is as follows: a double-layer insulating enclosure structure is formed by covering the copper electrode with an insulating sleeve and an insulating cap, which realizes the electrical isolation between the electrode and the metal shell. The insulating components are pressed by the fastening plugs at both ends of the terminal block, and a vacuum seal is achieved in conjunction with the sealing ring on the flange of the body. The terminal block and fastening plug made of 304 stainless steel form a closed explosion-proof shell to block the internal electric arc from spreading outward. The removable protective components realize the protection of internal components and rapid maintenance.

[0019] The specific working principle of this invention is as follows: The copper electrode 100 runs through the entire terminal block, and its two ends are connected to the heating element inside the furnace and the external power supply respectively through the boron nitride connector 101 to realize current transmission. The insulating sleeve 200 is sleeved on the outside of the copper electrode 100, and its two ends are sealed by the insulating plug cap 201 to form a complete insulating wrapping layer, blocking the electrical path between the copper electrode 100 and the terminal block 300, preventing creepage and short circuit. The terminal block 300 is sleeved on the outside of the insulating component, and its two ends are threadedly connected to the terminal block 300 through the fastening plug 400, which compresses the insulating component to achieve a seal. The body flange 500 and the mounting flange 600 are concentrically set. A sealing ring 700 is set in the annular groove 800 of the body flange 500. During installation, the terminal block is fixed to the furnace wall by bolts passing through the threaded hole 501, and the sealing ring 700 is compressed to achieve a vacuum seal.

[0020] The first protective shell 900 and the second protective shell 901 of the protective component are sleeved on the outer surface of the terminal block 300. They are quickly positioned by the positioning block 902 and the positioning groove 903. The locking strip 904 cooperates with the locking groove 905 to increase the fastening. The locking plate 906 is fixed and locked by the locking bolt 907 to form external protection and prevent the exposed part from being damaged by external force.

[0021] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0022] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0023] Embodiment 1 of the explosion-proof vacuum furnace insulating terminal provided by the present invention: like Figures 1 to 4 As shown, the copper electrode 100 is used to transmit current. The copper electrode 100 is made of copper with high conductivity. The copper electrode 100 runs through the entire terminal block 300. The insulating components include an insulating sleeve 200 and two insulating caps 201. The insulating sleeve 200 is sleeved on the outside of the copper electrode 100 to achieve electrical isolation between the copper electrode 100 and the outer metal shell. The two insulating caps 201 are respectively set at both ends of the insulating sleeve 200 to form a double-layer insulating wrapping structure.

[0024] The terminal block 300 is sleeved on the outside of the insulating component to accommodate and protect it. Two fastening plugs 400 are threaded to both ends of the terminal block 300 to press and fix the insulating component. A body flange 500 and a mounting flange 600 are fixedly connected to the middle of the terminal block 300. An annular groove 800 is provided on the top of the body flange 500, and a sealing ring 700 is provided in the annular groove 800. After the body flange 500 abuts against the furnace wall, the mounting flange 600 presses the body flange 500, thereby squeezing the sealing ring 700 tightly against the furnace wall to achieve a vacuum seal with the furnace wall.

[0025] The protective components include a first protective shell 900 and a second protective shell 901. The first and second protective shells 900 and 901 are fitted onto the outer surface of the terminal block 300 to form external protection. A positioning block 902 is fixedly connected to one side of the first protective shell 900. A positioning groove 903, adapted to the positioning block 902, is provided at the connection point between the second and first protective shells 901 and the terminal block 300 for quick positioning and installation. A retaining strip 90 is fixed to the connection surfaces of the first and second protective shells 900 and the terminal block 300. 4. The outer surface of the terminal block 300 is provided with a groove 905 that is adapted to the retaining strip 904 to increase the tightness of the connection surface. The first protective shell 900 and the second protective shell 901 are installed below the mounting flange 600 to strengthen the protection of the exposed terminal block 300. When the first protective shell 900 and the second protective shell 901 are installed, the positioning block 902 engages with the positioning groove 903, and the retaining strip 904 is inserted into the groove 905, so that it can be firmly installed on the surface of the terminal block 300 to prevent damage from external forces.

[0026] The main flange 500 is fixedly connected to the outer surface of the terminal block 300. The mounting flange 600 is sleeved on the outer surface of the terminal block 300. The main flange 500 and the mounting flange 600 are concentrically arranged, and both have threaded holes 501 on their outer surfaces for bolts to pass through. The mounting flange 600 can slide on the outer surface of the terminal block 300 while the main flange 500 remains fixed. The threaded holes 501 of the two flanges correspond to each other. After the bolts pass through, the threaded holes 501 are fixed to the furnace wall, thereby installing the terminal block as a whole on the furnace wall.

[0027] Both ends of the copper electrode 100 are fixedly connected to boron nitride connectors 101. The boron nitride connectors 101 are used to connect to the heating elements in the furnace and the external power supply. They have both high temperature resistance and insulation properties. Two fastening plugs 400 press and fix the boron nitride connectors 101 to both ends of the copper electrode 100. The inner wall of the boron nitride connectors 101 is provided with an internal thread groove. Both ends of the copper electrode 100 are provided with matching threads, which facilitates the assembly between the copper electrode 100 and the boron nitride connectors 101.

[0028] The insulating sleeve 200 is made of alumina ceramic or high-temperature resistant polyimide. The insulating cap 201 and the insulating sleeve 200 together form a complete insulating isolation layer to prevent creepage and short circuit between the copper electrode 100 and the terminal block 300.

[0029] Locking plates 906 are fixedly connected at the connection between the first protective shell 900 and the second protective shell 901. The two locking plates 906 are fixedly connected by locking bolts 907. When the first protective shell 900 and the second protective shell 901 are closed, the locking bolts 907 are locked and fixed to prevent the connection from loosening during use.

[0030] Both the terminal block 300 and the fastening plug 400 are made of 304 stainless steel to form a closed explosion-proof shell and block the internal electric arc from spreading outward. The insulating components and the terminal block 300 are interference-fitted and, together with the sealing ring 700, form a double sealing structure.

[0031] Both ends of the terminal block 300 are provided with threaded grooves 301, and the inner walls of the two fastening plugs 400 are provided with threaded protrusions 302 that are adapted to the threaded grooves 301. The terminal block 300 and the fastening plugs 400 are connected by threaded grooves 301 and threaded protrusions 302.

[0032] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0033] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An explosion-proof vacuum furnace insulating terminal block, characterized in that, include: Copper electrode (100), which is used to transmit current; An insulating component includes an insulating sleeve (200) and two insulating caps (201). The insulating sleeve (200) is fitted over the outside of the copper electrode (100) to achieve electrical isolation between the copper electrode (100) and the outer metal shell. The two insulating caps (201) are respectively disposed at both ends of the insulating sleeve (200) to form a double-layer insulating wrapping structure. A terminal block (300) is fitted over the outside of the insulating component to accommodate and protect it. Two fastening plugs (400) are threaded to both ends of the terminal block (300) to press the insulating component. A body flange (500) and a mounting flange (600) are fixedly connected to the middle of the terminal block (300). An annular groove (800) is provided on the top of the body flange (500), and a sealing ring (700) is provided in the annular groove (800) to achieve a vacuum seal with the furnace wall. The protective component includes a first protective shell (900) and a second protective shell (901). The first protective shell (900) and the second protective shell (901) are fitted onto the outer surface of the terminal block (300) to form external protection. A positioning block (902) is fixedly connected to one side of the first protective shell (900). A positioning groove (903) adapted to the positioning block (902) is provided at the connection between the second protective shell (901) and the first protective shell (900) for quick positioning and installation. A retaining strip (904) is fixed to the connection surface between the first protective shell (900) and the second protective shell (901) and the terminal block (300). A retaining groove (905) adapted to the retaining strip (904) is provided on the outer surface of the terminal block (300) to increase the tightness of the connection surface.

2. The explosion-proof vacuum furnace insulating terminal block according to claim 1, characterized in that, The main flange (500) is fixedly connected to the outer surface of the terminal block (300), and the mounting flange (600) is sleeved on the outer surface of the terminal block (300). The main flange (500) and the mounting flange (600) are concentrically arranged, and both have threaded holes (501) on their outer surfaces for bolts to pass through, so as to install the terminal block as a whole on the furnace wall.

3. The explosion-proof vacuum furnace insulating terminal block according to claim 1, characterized in that, The two ends of the copper electrode (100) are respectively fixedly connected to boron nitride connectors (101). The boron nitride connectors (101) are used to connect to the heating elements in the furnace and the external power supply. They have both high temperature resistance and insulation properties. The two fastening plugs (400) press and fix the boron nitride connectors (101) to the two ends of the copper electrode (100).

4. The explosion-proof vacuum furnace insulating terminal block according to claim 1, characterized in that, The insulating sleeve (200) is made of alumina ceramic or high-temperature resistant polyimide. The insulating cap (201) and the insulating sleeve (200) together form a complete insulating isolation layer to prevent creepage and short circuit between the copper electrode (100) and the terminal block (300).

5. The explosion-proof vacuum furnace insulating terminal block according to claim 1, characterized in that, Locking plates (906) are fixedly connected at the connection between the first protective shell (900) and the second protective shell (901), and the two locking plates (906) are fixedly connected by locking bolts (907).

6. The explosion-proof vacuum furnace insulating terminal block according to claim 1, characterized in that, The terminal block (300) and the fastening plug (400) are both made of 304 stainless steel to form a closed explosion-proof shell and block the internal electric arc from spreading outward. The insulating component and the terminal block (300) are fitted with an interference fit and a sealing ring (700) to form a double sealing structure.

7. The explosion-proof vacuum furnace insulating terminal block according to any one of claims 1 to 6, characterized in that, Both ends of the terminal block (300) are provided with threaded grooves (301), and the inner walls of the two fastening plugs (400) are provided with threaded protrusions (302) that are compatible with the threaded grooves (301). The terminal block (300) and the fastening plugs (400) are connected by threaded grooves (301) and threaded protrusions (302).

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