A kind of fuse tube sealing structure

Abstract

The present application relates to the technical field of sealing and insulation of electric power equipment, and provides a fuse tube sealing structure, including a fuse tube end cover and a fuse tube fuse tube, the fuse tube fuse tube is located at the front end of the fuse tube, the fuse tube end cover includes a fixed block, a telescopic plate and a fixed plate, a boss is provided on the fixed block, the telescopic plate is movably sleeved on the boss, a top rod for driving the telescopic plate to move forward and backward along the boss is pierced on the fixed block, an extension portion is provided at the end of the boss, and the fixed plate is fixedly arranged on the extension portion. Based on this, it can effectively replace the disadvantages of traditional sealing by coating grease on the rubber ring, has strong overall practicality, and has great market promotion value.

Description

Technical Field

[0001] The present application relates to the technical field of sealing and insulation of electric power equipment, and in particular to a fuse tube sealing structure. Background Art

[0002] The fuse tube is a very important accessory of the gas high-voltage switchgear. It is cylindrical in shape and made of insulating material. The fuse tube, contacts and other connectors can be inserted into the interior for connection and conduction, and the external insulating cylinder is used for protection and insulation.

[0003] When the fuse tube is inserted into the fuse barrel, it is generally necessary to set a corresponding sealing structure on the fuse barrel end cover to prevent condensation or dust accumulation at the mouth, which will penetrate into the fuse barrel and cause the insulation performance of the fuse barrel to decrease. The existing sealing structure generally coats a layer of grease on the rubber ring on the fuse barrel end cover to achieve the sealing effect. With respect to the above-mentioned related technologies, the inventor believes that coating the rubber ring with grease will damage the normal service life of the rubber ring after long-term use, and it needs to be coated every time it is used, which is inconvenient to operate. Therefore, how to design a sealing structure that is easy to quickly realize between the fuse barrel end cover and the fuse barrel body is a problem that technicians in this field need to consider. Summary of the invention

[0004] In order to improve the problem that the existing method of coating grease on a rubber ring to achieve sealing easily results in a short service life of the rubber ring, the purpose of the present application is to provide a fuse tube sealing structure.

[0005] The present application provides a fuse tube sealing structure adopting the following technical solution:

[0006] A fuse tube sealing structure comprises a fuse tube end cover and a fuse tube, the fuse tube is located at the front end of the fuse tube, the fuse tube end cover comprises a fixed block, a telescopic plate and a fixed plate, a boss is arranged on the fixed block, the telescopic plate is movably sleeved on the boss, a top rod for driving the telescopic plate to move forward and backward along the boss is passed through the fixed block, an extension portion is arranged at the end of the boss, and the fixed plate is fixedly arranged on the extension portion; a plurality of support arms are arranged at equal angles along the circumferential direction on the end surface of the telescopic plate facing the fixed plate, the support arms are movably connected with the telescopic plate through a first hinge column, a spring-pressed piece is arranged on the side of the support arm located at the first hinge column, a rubber ring is commonly arranged at the ends of the plurality of support arms facing the fixed plate, and a fixing ring is commonly connected to the inner walls of the plurality of support arms, the fixing ring is utilized to make the plurality of support arms tilt outward, and a pull rod for controlling the support arms to tilt inward is connected to the fixing ring.

[0007] By adopting the above technical solution, when the fuse tube is ready to be sleeved in the external fuse tube body, the pull rod is stretched outward so that the support arm is oriented inward as a whole under the action of the spring-pressed part, so that it will not interfere with the normal assembly of the fuse tube into the fuse tube body. After the fuse tube is installed, there is a gap between the fuse tube body and the fixed plate. At this time, the pull rod is released, and the support arm is tilted outward by the elastic recovery of the spring-pressed part. In order to seal the gap, the push rod pushes the telescopic plate to slide along the boss. During the sliding of the telescopic plate, the rubber ring at the end of the support arm is driven to fully abut against the gap between the fuse tube body and the fixed plate to achieve automatic sealing. This structure can effectively avoid condensation or dust accumulation in the fuse tube due to sealing problems, thereby avoiding degradation of insulation performance.

[0008] Optionally, a first receiving groove is provided on the fixing block at the installation position of the telescopic plate, and a first through hole is provided on the fixing block for the ejector rod to pass through, and the ejector rod passes through the first through hole and abuts against the telescopic plate.

[0009] By adopting the above technical solution, the first receiving groove is used to limit the telescopic plate to prevent it from lateral shaking, while enhancing the local installation stability.

[0010] Optionally, a plurality of groups of mounting blocks are arranged at equal angles along the circumferential direction on the end surface of the telescopic plate facing the fixed plate, each support arm is movably connected between a group of mounting blocks through a first hinge column, a connecting piece is connected to the top of the spring-pressing piece on the side of the support arm, the spring-pressing piece is fixedly connected to the connecting piece, a limiting hole is provided at the bottom of the spring-pressing piece on the telescopic plate, and the spring-pressing piece is installed in the limiting hole.

[0011] By adopting the above technical solution, the support arm rotates between each group of mounting blocks through the first hinge column, the limiting hole is used to limit the installation of the spring-pressing piece to prevent it from deviating, and the connecting piece is fixedly installed on the top of the spring-pressing piece to prevent it from popping out. By setting the spring-pressing piece, when the rubber ring on the support arm is pre-contacted on the gap between the fuse tube body and the fixed plate, the elastic recovery of the spring-pressing piece can automatically control the support arm to tilt outward.

[0012] Optionally, an arc-shaped step is provided in an annular manner at the circumference of the end surface of the fixed plate facing the telescopic plate.

[0013] By adopting the above technical solution, the arc-shaped step can effectively increase the local fitting force of the rubber ring, prevent the occurrence of gaps, and improve air tightness.

[0014] Optionally, an arc-shaped portion is provided at the end of the support arm facing the fixed plate, and a rubber ring is fixedly mounted on the arc-shaped portion. When the pull rod is stretched outward, the rubber ring is compressed by the spring-loaded part and is located on the inner side of the arc-shaped step; when the pull rod is released, the rubber ring is elastically restored to the outer side of the arc-shaped step by the spring-loaded part.

[0015] By adopting the above technical solution, the end of the support arm is designed as an arc-shaped part, which is convenient for fitting and connecting the rubber ring, and at the same time can increase the pressing force on the rubber ring, so that the rubber ring has strong stability and strong fitting force when it abuts against the arc step.

[0016] Optionally, a second receiving groove is formed on the other side of the fixing block away from the boss, an insulating pad is installed on the second receiving groove, and a second through hole for the ejector rod to pass through is formed on the insulating pad.

[0017] By adopting the above technical solution, the second receiving groove is used to install the limiting insulating pad, while enhancing the local fitting stability. The insulating pad can effectively prevent the hidden danger of conductivity between the end cover of the fuse tube and the fuse tube of the fuse tube. The second through hole is connected to the first through hole in a straight line, which is convenient for the top rod to be movable through and abutted.

[0018] Optionally, the fixed block is located on the outer periphery of the insulating pad and is sleeved with a cover body, the cover body is provided with a third through hole for the push rod to pass through, a group of connecting arms are provided at the third through hole, a pressure block is movably provided between each group of connecting arms via a second hinged arm, a cam is provided at the end of the pressure block facing the push rod, and the cam is vertically connected to the pressure block.

[0019] By adopting the above technical scheme, the third through hole is linearly connected with the second through hole and the first through hole respectively, the pressure block is movably hinged between the two connecting arms, the cam and the pressure block are vertically connected, and when the pressure block is perpendicular to the end face of the cover body, the cam does not abut on the push rod; when the pressure block is rotated through the second hinge column to make it parallel to the end face of the cover body, the cam abuts on the push rod in the third through hole, and the push rod slides toward the telescopic plate under the action of thrust, and the rubber ring on the control support arm of the telescopic plate is pushed by the push rod to abut on the arc-shaped step circumferentially of the fixed plate, thereby realizing the gap sealing between the fuse tube body and the fixed plate.

[0020] Optionally, the pull rod is vertically connected to the fixing ring, and the pull rod sequentially passes through the fixing block, the insulating pad and the cover body and extends outward.

[0021] By adopting the above technical solution, the pull rod is vertically connected to the fixed ring. When the pull rod is stretched toward the outside of the cover body, the fixed ring uniformly controls the several support arms on the telescopic plate to tilt inward as a whole. At this time, the rubber ring is compressed by the spring-pressed part and is located on the inner side of the arc-shaped step, which is convenient for the normal assembly of the fuse tube into the fuse tube body. When it is necessary to control the gap sealing between the fuse tube body and the fixed plate, the pull rod is released, and the fixed ring uniformly controls the several support arms on the telescopic plate to tilt outward as a whole. At the same time, the push rod controls the telescopic plate to slide along the boss. At this time, the rubber ring is elastically restored to the outer side of the arc-shaped step by the spring-pressed part to achieve gap sealing.

[0022] Optionally, an annular groove is provided on the circumference of the cover body, a group of snap-fit ​​pieces are symmetrically distributed on the annular groove, the snap-fit ​​piece has a notch, and a clearance opening is provided on the side of the opening of the annular groove.

[0023] By adopting the above technical solution, the annular groove is used to adapt to the external opening of the fuse barrel body. By setting the clearance opening, the guide column at the opening of the fuse barrel body can pass through the clearance opening and be installed on the notch of the snap piece, thereby strengthening the stable installation of the fuse barrel in the fuse barrel body to prevent it from falling out.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The support arm is controlled by the pull rod to tilt inward as a whole under the action of the spring-pressed part, which is convenient for process installation. The push rod is used to push the telescopic plate to slide along the boss. During the sliding of the telescopic plate, the rubber ring at the end of the support arm is driven to fully abut against the gap between the fuse barrel body and the fixed plate to achieve automatic sealing. This structure can effectively avoid condensation or dust accumulation in the fuse tube of the fuse barrel due to sealing problems, and avoid the reduction of insulation performance. At the same time, it can effectively replace the disadvantages of traditional coating of grease on the rubber ring to achieve sealing. It has strong overall practicality and great market promotion value;

[0026] 2. By setting a spring-loaded piece, when the rubber ring on the support arm is pre-contacted on the gap between the fuse barrel and the fixing plate, the support arm can be automatically controlled to tilt outward by the elastic recovery of the spring-loaded piece;

[0027] 3. By setting an arc-shaped step on the fixing part, the local fitting force of the rubber ring can be effectively increased, gaps can be prevented, and air tightness can be improved;

[0028] 4. The end of the support arm is designed to be an arc-shaped portion, which is convenient for fitting and connecting the rubber ring, and can also increase the pressing force on the rubber ring, so that the rubber ring has strong stability and strong fitting force when it abuts against the arc-shaped step. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application;

[0030] Figure 2 It is a schematic diagram of the exploded structure of the fuse barrel end cover of Example 1 of the present application;

[0031] Figure 3 is a schematic diagram of the structure of the fixing block from the first perspective of Example 1 of the present application;

[0032] Figure 4 is a schematic structural diagram of a fixing block from a second viewing angle of Example 1 of the present application;

[0033] Figure 5 is a schematic diagram of the telescopic plate structure of Example 1 of the present application;

[0034] Figure 6is a schematic diagram of the fixed plate structure of Example 1 of the present application;

[0035] Figure 7 is a schematic diagram of the cover structure of Example 1 of the present application;

[0036] Figure 8 It is a schematic diagram of the fuse barrel structure of Example 1 of the present application;

[0037] Fig. 9 It is a schematic diagram of the fuse tube end cover structure of Example 2 of the present application.

[0038] Description of reference numerals:

[0039] 100, fuse tube end cover; 110, fixing block; 111, boss; 112, extension portion; 113, first receiving groove; 120, telescopic plate; 121, mounting block; 122, first hinge column; 140, support arm; 141, connecting piece; 142, spring-pressing member; 143, limiting hole; 144, fixing ring; 145, pull rod; 146, first through hole; 147, arc portion; 148, second receiving groove; 150, insulating pad; 15 1. Second through hole; 160. Fixing plate; 161. Arc step; 200. Push rod; 300. Rubber ring; 400. Cover body; 410. Third through hole; 420. Connecting arm; 430. Second hinge; 440. Press block; 450. Cam; 460. Annular groove; 461. Clearance opening; 470. Snap piece; 471. Notch; 500. Fuse tube; 600. Fuse tube body; 610. Opening; 620. Guide column. DETAILED DESCRIPTION

[0040] The following is combined with Figure 1-9 , further details of this application are given.

[0041] Embodiment 1: A fuse tube sealing structure, referring to Figure 1-Figure 3 , comprising a fuse barrel end cover 100 and a fuse barrel fusible tube 500, wherein the fuse barrel fusible tube 500 is connected to the fuse barrel end cover 100 in a straight line and is located at the front end of the fuse barrel end cover 100. The fuse barrel end cover 100 comprises a fixing block 110, a telescopic plate 120 and a fixing plate 160, wherein a boss 111 is provided on the fixing block 110, a first receiving groove 113 is circumferentially provided at the bottom of the boss 111, the telescopic plate 120 is movably sleeved on the boss 111 and installed in the first receiving groove 113, an extension portion 112 is provided at the end of the opening 610 of the fixing block 110, and the fixing plate 160 is fixedly sleeved on the extension portion 112.

[0042] Reference Figure 2 and Figure 4A second receiving groove 148 is opened on the other side of the fixing block 110 away from the boss 111, and an insulating pad 150 is installed on the second receiving groove 148. The second receiving groove 148 is used to install the limiting insulating pad 150 and enhance the local fitting stability. The insulating pad 150 can effectively prevent the hidden danger of conduction between the fuse tube end cover 100 and the fuse tube 500.

[0043] Reference Figure 2 and Figure 5 , the end surface of the telescopic plate 120 facing the fixed plate 160 is provided with several groups of mounting blocks 121 at equal angles along the circumferential direction. In the embodiment of the present application, eight groups of mounting blocks 121 are provided, and a support arm 140 is movably hinged between each group of mounting blocks 121. The support arm 140 is connected between each group of mounting blocks 121 through a first hinge column 122, and a spring-pressing member 142 is provided on the inner side of each support arm 140. In this embodiment, the spring-pressing member 142 adopts a telescopic spring, and a connecting piece 141 is connected to the inner side of the support arm 140 at the top of the spring-pressing member 142, and the spring-pressing member 142 is fixedly connected to the connecting piece 141. The telescopic plate 120 is provided with a limited hole 143 at the bottom of the spring-pressing member 142, and the spring-pressing member 142 is installed in the limited hole 143. The inner walls of the several support arms 140 are commonly connected with a fixing ring 144, and the ends of the several support arms 140 facing the fixed plate 160 are commonly provided with a rubber ring 300.

[0044] Among them, several support arms 140 are tilted outward as a whole by using fixing rings 144, and the angle formed by several support arms 140 and telescopic plate 120 is 15-30 degrees. The end of support arm 140 facing fixed plate 160 is provided with arc-shaped portion 147, and rubber ring 300 is fixedly installed on the arc-shaped portion 147 of each support arm 140. The end of support arm 140 is designed as arc-shaped portion 147, which is convenient for fitting and connecting rubber ring 300, and can also increase the pressing force on rubber ring 300.

[0045] Reference Figure 1 and Figure 6 The fixing ring 144 is connected with a pull rod 145 for controlling the support arms 140 to tilt inwards, and the pull rod 145 is vertically connected to the fixing ring 144. An arc-shaped step 161 is provided in a circular manner at the circumference of the end surface of the fixing plate 160 facing the telescopic plate 120. When the pull rod 145 is stretched outwards, the fixing ring 144 controls the several support arms 140 on the telescopic plate 120 to tilt inwards as a whole, and the rubber ring 300 is compressed by the spring-pressing member 142 and is located on the inner side of the arc-shaped step 161; when the pull rod 145 is released, the fixing ring 144 controls the several support arms 140 on the telescopic plate 120 to tilt outwards as a whole, and the rubber ring 300 is elastically restored by the spring-pressing member 142 and is located on the outer side of the arc-shaped step 161.

[0046] Reference Figure 1 and Figure 7 In order to enable the pull rod 145 to be stretched linearly outward, the pull rod 145 sequentially passes through the fixing block 110, the insulating pad 150 and the cover body 400 and extends outward.

[0047] Reference Figure 2 The fixing block 110 is provided with a first through hole 146 for the push rod 200 to pass through, and the insulating pad 150 is provided with a second through hole 151 for the push rod 200 to pass through. The second through hole 151 is connected to the first through hole 146 in a straight line, so that the push rod 200 can be movably passed through and abutted.

[0048] Reference Figure 2 and Figure 7 The fixing block 110 is located on the outer periphery of the insulating pad 150 and is sleeved with a cover body 400. The cover body 400 is provided with a third through hole 410 for the ejector 200 to pass through, and the third through hole 410 is connected with the second through hole 151 in a straight line. The ejector 200 is connected with the second through hole 151 and the first through hole 146 in sequence through the third through hole 410 and abuts against the telescopic plate 120. A group of connecting arms 420 are provided at the third through hole 410, and a pressing block 440 is movably provided between each group of connecting arms 420 through a second hinge 430. A cam 450 is provided at the end of the pressing block 440 facing the ejector 200, and the cam 450 is vertically connected to the pressing block 440. The pressure block 440 is movably hinged between the two connecting arms 420, and the cam 450 is vertically connected to the pressure block 440. When the pressure block 440 is perpendicular to the end face of the cover body 400, the cam 450 does not abut against the push rod 200; when the pressure block 440 is rotated through the second hinge 430 column to make it parallel to the end face of the cover body 400, the cam 450 abuts against the push rod 200 in the third through hole 410, and the push rod 200 slides toward the telescopic plate 120 under the action of the thrust. The push of the push rod 200 on the telescopic plate 120 controls the rubber ring 300 on the support arm 140 to abut against the arc-shaped step 161 circumferentially of the fixed plate 160, thereby realizing the sealing of the gap between the fuse tube body 600 and the fixed plate 160.

[0049] Reference Figure 7 and Figure 8 The fuse barrel body 600 is provided with a plurality of openings 610 for installing the fuse barrel molten tube 500, and a group of guide pillars 620 are symmetrically arranged at each opening 610. The cover body 400 is provided with an annular groove 460 in the circumference, and a group of snap-on pieces 470 are symmetrically distributed on the annular groove 460, and the snap-on piece 470 has a notch 471, and a clearance opening 461 is arranged at the side of the annular groove 460. When the fuse barrel end cover 100 inserts the fuse barrel molten tube 500 into the fuse barrel body 600, the cover body 400 is rotated so that the guide pillars 620 can pass through the clearance opening 461 and abut against the notch 471 of the snap-on piece 470, so that the fuse barrel molten tube 500 can be stably installed in the fuse barrel body 600 to prevent it from falling out.

[0050] The implementation principle of the embodiment of the present application is as follows: when the fuse tube 500 is ready to be sleeved in the external fuse tube body 600, the pull rod 145 is stretched outward so that the support arm 140 is overall oriented inward under the action of the spring-pressed piece 142, so that it will not interfere with the normal assembly of the fuse tube 500 into the fuse tube body 600. After the fuse tube 500 is installed, there is a gap between the fuse tube body 600 and the fixing plate 160. At this time, the pull rod 145 is released, and the support arm 140 is elastically restored to tilt outward by the spring-pressed piece 142. In order to seal the gap, after the fuse tube end cover 100 inserts the fuse tube 500 into the fuse tube body 600, the cover body 400 is rotated so that the guide column 620 can pass through the clearance opening 461 and abut against the notch 471 of the snap-on piece 470, so that the fuse tube 500 is stably installed in the fuse tube body 600 to prevent it from falling out. Then, when the pressure block 440 on the cover body 400 is rotated through the second hinge 430 column to make it parallel to the end face of the cover body 400, the cam 450 abuts against the top rod 200 in the third through hole 410, and the top rod 200 slides toward the telescopic plate 120 under the action of the thrust. The telescopic plate 120 is pushed by the top rod 200 to control the rubber ring 300 on the support arm 140 to abut against the arc-shaped step 161 circumferentially of the fixed plate 160, thereby realizing the gap sealing between the fuse tube body 600 and the fixed plate 160.

[0051] Example 2, reference Fig. 9 The difference between this embodiment and the first embodiment is that the rubber ring 300 is integrally disposed on the boss 111 of the fixing block 110 so as to be located between the telescopic plate 120 and the fixing plate 160 .

[0052] The implementation principle of the embodiment of the present application is: when only the rubber ring 300 exists between the telescopic plate 120 and the fixed plate 160, after the fuse tube end cover 100 inserts the fuse tube 500 into the fuse tube barrel body 600, the cover body 400 is rotated so that the guide column 620 can pass through the clearance opening 461 and abut against the notch 471 of the snap piece 470, so that the fuse tube 500 is stably installed in the fuse tube barrel body 600 to prevent it from falling out. Then, the pressing block 440 on the cover body 400 is rotated through the second hinge 430 column to make it parallel to the end face of the cover body 400. At this time, the cam 450 abuts against the top rod 200 in the third through hole 410. The top rod 200 slides toward the telescopic plate 120 under the action of the thrust. The telescopic plate 120 is pushed by the top rod 200 to squeeze the rubber ring 300 on both sides. After being squeezed, the outer periphery of the rubber ring 300 expands and extends outward to abut against the inner wall of the fuse tube body 600, thereby realizing the sealing of the gap between the fuse tube body 600 and the fixed plate 160.

[0053] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fuse tube sealing structure, characterized in that: The invention comprises a fuse barrel end cover (100) and a fuse barrel fusion tube (500), wherein the fuse barrel fusion tube (500) is located at the front end of the fuse barrel, and the fuse barrel end cover (100) comprises a fixed block (110), a telescopic plate (120) and a fixed plate (160), wherein a boss (111) is provided on the fixed block (110), the telescopic plate (120) is movably sleeved on the boss (111), a top rod (200) is passed through the fixed block (110) and is used to drive the telescopic plate (120) to move forward and backward along the boss (111), an extension portion (112) is provided at the end of the boss (111), and the fixed plate (160) is fixedly arranged on the extension portion (112); A plurality of support arms (140) are arranged at equal angles along the circumferential direction on the end surface of the telescopic plate (120) facing the fixed plate (160); the support arm (140) is movably connected to the telescopic plate (120) via a first hinge column (122); a spring-loaded member (142) is arranged on the side of the support arm (140) located on the first hinge column (122); a rubber ring (300) is commonly arranged at the ends of the plurality of support arms (140) facing the fixed plate (160); and a fixing ring (144) is commonly connected to the inner walls of the plurality of support arms (140); the fixing ring (144) is used to tilt the plurality of support arms (140) toward the outside; and a pull rod (145) is connected to the fixing ring (144) for controlling the support arms (140) to tilt toward the inside.

2. A fuse tube sealing structure according to claim 1, characterized in that: The fixing block (110) is provided with a first receiving groove (113) at the installation position of the telescopic plate (120), and the fixing block (110) is provided with a first through hole (146) for the push rod (200) to pass through. The push rod (200) passes through the first through hole (146) and abuts against the telescopic plate (120).

3. A fuse tube sealing structure according to claim 1, characterized in that: The end surface of the telescopic plate (120) facing the fixed plate (160) is provided with a plurality of groups of mounting blocks (121) at equal angles along the circumferential direction; each support arm (140) is movably connected between a group of mounting blocks (121) via a first hinge column (122); a side of the support arm (140) is located at the top of the spring-pressing member (142) and is connected to a connecting piece (141); the spring-pressing member (142) is fixedly connected to the connecting piece (141); a limiting hole (143) is provided at the bottom of the telescopic plate (120) and the spring-pressing member (142); the spring-pressing member (142) is installed in the limiting hole (143).

4. A fuse tube sealing structure according to claim 1, characterized in that: An arc-shaped step (161) is provided in an annular manner at the circumference of the end surface of the fixed plate (160) facing the telescopic plate (120).

5. A fuse tube sealing structure according to claim 4, characterized in that: An arc-shaped portion (147) is provided at the end of the support arm (140) facing the fixed plate (160), and the rubber ring (300) is fixedly mounted on the arc-shaped portion (147). When the pull rod (145) is stretched outward, the rubber ring (300) is compressed by the elastic member (142) and is located on the inner side of the arc-shaped step (161); when the pull rod (145) is released, the rubber ring (300) is elastically restored by the elastic member (142) and is located on the outer side of the arc-shaped step (161).

6. A fuse tube sealing structure according to claim 1, characterized in that: A second receiving groove (148) is provided on the other side of the fixing block (110) away from the boss (111), an insulating pad (150) is installed on the second receiving groove (148), and a second through hole (151) for the push rod (200) to pass through is provided on the insulating pad (150).

7. A fuse tube sealing structure according to claim 6, characterized in that: The fixing block (110) is located on the outer periphery of the insulating pad (150) and is sleeved with a cover body (400). The cover body (400) is provided with a third through hole (410) for the push rod (200) to pass through. A group of connecting arms (420) is provided at the third through hole (410). A pressing block (440) is movably provided between each group of connecting arms (420) via a second hinge (430) arm. A cam (450) is provided at the end of the pressing block (440) facing the push rod (200). The cam (450) and the pressing block (440) are vertically connected.

8. A fuse tube sealing structure according to claim 7, characterized in that: The pull rod (145) is vertically connected to the fixing ring (144), and the pull rod (145) sequentially passes through the fixing block (110), the insulating pad (150) and the cover body (400) to extend outward.

9. A fuse tube sealing structure according to claim 7, characterized in that: An annular groove (460) is provided in the circumferential direction of the cover body (400), a group of snap-fit ​​pieces (470) are symmetrically distributed on the annular groove (460), the snap-fit ​​pieces (470) have a notch (471), and a clearance opening (461) is provided on the side of the annular groove (460) located at the opening (610).

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