A vacuum terminal box

Abstract

The application belongs to the technical field of power distribution equipment box, in particular to a vacuum terminal box, which comprises a box body, the material of the box body is stainless steel with high strength, corrosion resistance and good heat insulation performance, the overall structure design shell adopts a double-layer structure, the surface is subjected to corrosion prevention treatment, and the vacuum terminal box further comprises an opening and closing mechanism symmetrically arranged in the box body and a visual warning mechanism installed on one side of the box body, the opening and closing mechanism is arranged, the upper door plate is opened through a handle, then the lower door plate is opened, the connecting block above the upper door plate drives the guide plate to unfold downward after the upper and lower door plates are opened, the guide plate is naturally bent under the gravity, the shielding area is increased, the raindrops blown by the side wind are blocked by the two side guide plates, a larger rain-free buffer zone is formed in front of the box body through cooperation of the inclined upper door plate, the operation of the staff is facilitated, after the maintenance is completed, the lower door plate is closed first, then the edges of the upper and lower door plates are overlapped and folded, and the box body is sealed by the upper and lower door plates.

Description

Technical Field

[0001] This invention belongs to the technical field of power distribution equipment boxes, specifically a vacuum terminal box. Background Technology

[0002] Existing outdoor terminal boxes in substations suffer from various problems due to harsh working environments, significant differences in sealing performance among different devices, and complex maintenance procedures. These issues include condensation inside and outside the terminal boxes, corrosion of internal terminal blocks, and short circuits between DC positive and negative poles, posing significant safety risks to the power grid. Furthermore, current comprehensive management methods are technically demanding and complex, resulting in unsatisfactory maintenance outcomes.

[0003] During normal operation, it maintains a low vacuum inside the enclosure, reducing the adverse effects of the natural environment on the components inside the terminal box. During routine inspections and maintenance, it quickly restores the internal pressure to normal, thus minimizing the impact on personnel.

[0004] Existing outdoor terminal boxes generally suffer from safety hazards such as condensation, terminal block corrosion, and DC grounding due to harsh operating environments, poor sealing performance, and complex maintenance. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the technical solution adopted by this invention is: a vacuum terminal box, including a box body made of high-strength, corrosion-resistant, and heat-insulating stainless steel. The overall structural design features a double-layer shell with anti-corrosion treatment to extend its service life. It also includes:

[0006] The opening and closing mechanism is symmetrically arranged inside the box, and the visual warning mechanism is installed on one side of the box;

[0007] The visual warning mechanism includes a curved tube disposed inside the housing, with an air intake hole at the top of the curved tube and a retractable assembly installed inside the curved tube.

[0008] Furthermore, it also includes:

[0009] Top plate, which is located above the box body, and the top plate can be set as a triangular slope surface;

[0010] A vacuum pump is installed on one side of the housing;

[0011] A pressure relief mechanism is installed outside the opening and closing mechanism.

[0012] Furthermore, the visual warning mechanism also includes:

[0013] A drive block is installed inside the bend and positioned below the retraction assembly. A push switch is installed inside the drive block to turn on the warning light.

[0014] A scale plate is installed above the bend in the tube. The scale plate has graduations on its top. The height of the pointer determines the corresponding graduation, thereby determining the negative pressure inside the box.

[0015] Warning light, which is mounted on the outside of the drive block.

[0016] Furthermore, the opening and closing mechanism includes:

[0017] A shaft is symmetrically arranged inside the housing. The shaft is installed inside the housing and is electrically powered. Rotation of the shaft locks the upper and lower door panels together.

[0018] The shaft has bends evenly distributed on its exterior.

[0019] The upper door panel is located at the other end of the curved rod, and a groove is provided inside the upper door panel.

[0020] Furthermore, the opening and closing mechanism also includes:

[0021] An outwardly protruding edge is provided at the bottom of the upper door panel;

[0022] A strip sealing strip is disposed inside the protruding edge and is used to seal the contact area between the upper door panel and the lower door panel.

[0023] L-shaped sealing strips are symmetrically arranged on the surface of the upper door panel. The L-shaped sealing strips are installed on the inner side of the upper door panel and are used to seal the sides of the cabinet when the upper and lower door panels are closed.

[0024] Furthermore, the opening and closing mechanism also includes:

[0025] The guide plate is symmetrically arranged inside the upper door panel, and the outside of the guide plate is slidably connected to the inside of the groove of the upper door panel. The guide plate is made of waterproof material such as acrylic.

[0026] A connecting block is installed above the guide plate. The outside of the connecting block is slidably connected to the surface of the upper door panel. A slide rail is provided on the outside of the upper door panel so that the connecting block can drive the guide plate to be pulled out and retracted.

[0027] Furthermore, the opening and closing mechanism also includes:

[0028] A handle, which is mounted on the outside of the lower door panel;

[0029] The lower door panel is installed at the other end of the curved rod and is located below the upper door panel. The upper part of the lower door panel has an inner convex edge, which corresponds to the outer convex edge of the upper door panel, and they can be combined together to form a complete closed door panel.

[0030] Furthermore, the pressure relief mechanism includes:

[0031] The T-shaped lock head is rotatably connected to the outside of the box body, and one end of the T-shaped lock head is provided with a protrusion;

[0032] The pressure relief valve is installed on one side of the housing near the T-shaped lock head. The pressure relief valve has a pressure relief hole on its exterior. The valve body is made of carbon steel with good corrosion resistance.

[0033] Further, the shrinkage component includes:

[0034] A folding tube is installed inside a bent pipe, with the outside of the folding tube in contact with the inside of the bent pipe. The sides of the folding tube are made of rubber, the top opening is connected to the air intake, and the bottom is a rigid circular plate.

[0035] Vertical rods are evenly arranged inside the folding tube, and the other end of the vertical rods is connected to the inner wall of the bent tube. The vertical rods are elastic and are stretched when the folding tube is unfolded.

[0036] A connecting rod is installed in the middle of the inside of the folding tube, and the other end of the connecting rod passes through the air intake hole of the bent tube. Both the connecting rod and the vertical rod are made of lightweight materials.

[0037] Furthermore, the shrinkage assembly also includes:

[0038] A marker ball, which is mounted above the connecting rod;

[0039] A pointer is mounted above the marker ball, and the pointer corresponds to the position on the scale plate. The pointer is moved to different positions on the scale plate according to the movement of the folding cylinder.

[0040] A pressure rod is installed below the folding cylinder, and the bottom of the pressure rod contacts the top of the drive block.

[0041] The beneficial effects of this invention are as follows:

[0042] 1. This invention features an opening and closing mechanism. The upper door panel is opened via a handle, followed by the lower door panel. Once opened, the connecting block above the upper door panel causes the guide plate to extend downwards. The guide plate naturally bends under gravity, increasing the shielding area. The guide plates on both sides can block raindrops blown in by lateral winds. Combined with the inclined upper door panel, a larger rain-free buffer zone is formed in front of the enclosure, facilitating operation by staff. After maintenance, the lower door panel is closed first, and then the edges of the upper and lower door panels are overlapped and closed to seal the enclosure, creating a vacuum effect. Because there is no oxygen inside the enclosure in a vacuum environment, the equipment has a flame-retardant effect.

[0043] 2. This invention incorporates a visual warning mechanism. Uneven pressure on both sides of the shrinkage assembly causes deformation, leading to downward movement of the shrinkage assembly within the bend. Upon contact with the drive block, the shrinkage assembly is subjected to negative pressure, pressing the drive block and activating a switch inside the drive block. This illuminates a warning light, allowing observation from a distance that the chamber is under negative pressure. When the internal pressure is insufficient, the shrinkage assembly moves upward, extinguishing the warning light. The relative position of the shrinkage assembly and the scale plate also allows for assessment of whether the chamber is under negative pressure and whether the pressure meets the standard. This enables depressurization or reactivation of the vacuum pump, facilitating pressure monitoring from multiple angles and allowing for timely adjustments when pressure decreases or leaks occur. The visual design enhances the information available to staff regarding the internal workings of the chamber.

[0044] 3. This invention, through the setting of a shrinking component, utilizes the pressure difference between the inside and outside of the folding cylinder to cause it to extend downwards along the curved tube, pulling the vertical rod and placing the connecting rod inside the folding cylinder and curved tube. This causes the indicator ball and pointer to move downwards to the bottom of the scale plate. When the pressure remains constant, the pressure-sensitive rod contacts the top of the drive block. By maintaining a negative pressure state, the pressure-sensitive rod is continuously pressed against the top of the drive block, keeping the warning light constantly on. This allows personnel to see the warning light from a distance and determine that the inside of the chamber is under negative pressure. After prolonged static placement, due to changes in air pressure and environment, the pressure inside the chamber changes. When this happens, the pressure-sensitive rod moves away from the drive block, causing the warning light to go out. This indicates that the pressure inside the chamber has changed and has not reached the target air pressure, but it is still under negative pressure. Personnel can also judge by the pointer on the indicator ball; if the indicator ball is too high, it indicates a small pressure difference between the inside and outside, requiring inspection of the chamber's sealing. This allows personnel to easily observe pressure changes inside the chamber with the naked eye. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of the present invention;

[0046] Figure 2 This is a rear view of the present invention;

[0047] Figure 3 This is a schematic diagram of the opening and closing mechanism of the present invention;

[0048] Figure 4 This is a bottom view of the opening and closing mechanism of the present invention;

[0049] Figure 5 This is a partial structural schematic diagram of the opening and closing mechanism of the present invention;

[0050] Figure 6 This is a schematic diagram of the pressure relief mechanism of the present invention;

[0051] Figure 7 This is a schematic diagram of the visual warning mechanism of the present invention;

[0052] Figure 8 This is a schematic diagram of the structure of the shrinkage component of the present invention.

[0053] In the diagram: 1. Housing; 2. Top plate; 3. Vacuum pump; 4. Opening / closing mechanism; 401. Shaft; 402. Upper door panel; 403. Outer protruding edge; 404. Strip sealing strip; 405. L-shaped sealing strip; 406. Guide plate; 407. Connecting block; 408. Groove; 409. Bent rod; 410. Lower door panel; 411. Inner protruding edge; 5. Pressure relief mechanism; 501. T-type lock head; 502. 503. Protrusion; 504. Pressure relief valve; 505. Pressure relief hole; 6. Visual warning mechanism; 601. Bend; 602. Drive block; 603. Warning light; 604. Retractable assembly; 6041. Folding cylinder; 6042. Vertical rod; 6043. Connecting rod; 6044. Marker ball; 6045. Pointer; 6046. Touch lever; 605. Scale plate; 606. Air intake hole; 7. Handle. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0055] Example 1, please refer to Figures 1-7 The present invention provides a technical solution: a vacuum terminal box, which is described as follows.

[0056] Includes enclosure 1, which is made of high-strength, corrosion-resistant, and heat-insulating stainless steel. The overall structural design features a double-layer shell with anti-corrosion treatment to extend its service life. Also includes:

[0057] The opening and closing mechanism 4 is symmetrically arranged inside the box 1 and the visual warning mechanism 6 is installed on one side of the box 1;

[0058] Also includes:

[0059] Top plate 2 is set above the box body 1. Top plate 2 can be set as a triangle or a slope with one end higher than the other. By setting the top plate 2 as a slope, there is no horizontal area on the top plate 2, which prevents rainwater from accumulating.

[0060] Vacuum pump 3 is installed on one side of housing 1;

[0061] Pressure relief mechanism 5 is installed outside the opening and closing mechanism 4.

[0062] During operation, the opening and closing mechanism 4 is closed and locked. Then, the vacuum pump 3 evacuates the inside of the chamber 1. When the pressure inside the chamber 1 reaches the target vacuum pressure value, the vacuum pump 3 is stopped and the solenoid valve is used to maintain the seal. The visual warning mechanism 6 illuminates under negative pressure. When maintenance is required, the staff approaches the chamber 1 and observes the scale of the visual warning mechanism 6 to determine whether the inside of the chamber 1 is under negative pressure. Then, the pressure relief mechanism 5 is opened to balance the pressure inside the chamber 1, and the opening and closing mechanism 4 is opened for operation. In the vacuum environment, there is no oxygen inside the chamber 1, which gives the equipment a flame-retardant effect.

[0063] The visual warning mechanism 6 includes a curved tube 601 installed inside the housing 1, an air intake hole 606 opened above the curved tube 601, and a retraction component 604 installed inside the curved tube 601.

[0064] Visual warning mechanism 6 also includes:

[0065] Drive block 602 is installed inside the bend 601 and is located below the retraction assembly 604. A push switch is provided inside the drive block 602 to turn on the warning light 603.

[0066] The scale plate 605 is installed above the bend 601. The scale plate 605 is set with scales. The scale at the corresponding position is determined according to the height of the pointer 6045, thereby determining the negative pressure inside the box 1.

[0067] Warning light 603 is installed on the outside of drive block 602.

[0068] When negative pressure is drawn and maintained inside chamber 1, the uneven pressure on both sides of the shrinkage assembly 604 causes deformation, which moves the shrinkage assembly 604 downward within the bend 601 and touches the drive block 602. This causes the shrinkage assembly 604 to be subjected to negative pressure, pressing the drive block 602 and activating the switch inside the drive block 602, illuminating the warning light 603. This allows observation from a distance that the inside of chamber 1 is under negative pressure. When the pressure inside chamber 1 is insufficient, the shrinkage assembly 604 moves upward following the pressure change, extinguishing the warning light 603. At this time, the relative position of the shrinkage assembly 604 and the scale plate 605 can also be used to determine whether the inside of chamber 1 is under negative pressure and whether the pressure meets the standard. Then, pressure can be released or the vacuum pump 3 can be restarted. This allows staff to judge the pressure changes inside chamber 1 from multiple angles, enabling timely adjustments when the pressure inside chamber 1 decreases or leaks. The visualization feature increases the information available to staff regarding the inside of chamber 1.

[0069] The opening and closing mechanism 4 includes:

[0070] Shaft 401 is symmetrically arranged inside the housing 1. Shaft 401 is installed inside the housing 1. Shaft 401 is electric and rotates to lock the upper door panel 402 and the lower door panel 410. The upper door panel 402 and the lower door panel 410 can also be locked by a stainless steel hinge with self-locking function.

[0071] Bending rods 409 are evenly distributed on the outside of shafts 401;

[0072] The upper door panel 402 is located at the other end of the bent rod 409, and a groove 408 is provided inside the upper door panel 402.

[0073] The opening and closing mechanism 4 also includes:

[0074] The protruding edge 403 is located at the bottom of the upper door panel 402;

[0075] A strip sealing strip 404 is disposed inside the protruding edge 403 and is used to seal the contact position between the upper door panel 402 and the lower door panel 410.

[0076] L-shaped sealing strip 405 is symmetrically arranged on the surface of the upper door panel 402. The L-shaped sealing strip 405 is installed on the inner side of the upper door panel 402. The L-shaped sealing strip 405 is used for side sealing when the upper door panel 402 and the lower door panel 410 are closed and in contact with the housing 1.

[0077] The opening and closing mechanism 4 also includes:

[0078] Guide plate 406 is symmetrically arranged inside the upper door panel 402. The outside of guide plate 406 is slidably connected to the inside of the groove 408 of the upper door panel 402. The material of guide plate 406 is waterproof material such as acrylic.

[0079] Connecting block 407 is installed above guide plate 406. The outside of connecting block 407 is slidably connected to the surface of upper door panel 402. A slide is provided on the outside of upper door panel 402 so that connecting block 407 can drive guide plate 406 to be pulled out and retracted.

[0080] The opening and closing mechanism 4 also includes:

[0081] Handle 7 is installed on the outside of the lower door panel 410. A push-button latch is installed on the handle 7 so that it can be locked when the upper and lower door panels are fastened together.

[0082] The lower door panel 410 is installed at the other end of the bent rod 409. The lower door panel 410 is located below the upper door panel 402. An inner protruding edge 411 is provided on the upper part of the lower door panel 410. The inner protruding edge 411 of the lower door panel 410 corresponds to the outer protruding edge 403 of the upper door panel 402, and they can be combined together to form a complete closed door panel.

[0083] The terminal box adopts a top-and-bottom opening design, which facilitates operation and maintenance by staff and provides shade and rain protection. The size ratio of the upper and lower doors should be 2:1 or 4:1 for easy daily use and maintenance. In use, the upper door panel 402 is opened through the pressure relief mechanism 5, and then the lower door panel 410 is opened by pulling the handle 7. After the upper and lower doors are opened, the connecting block 407 above the upper door panel 402 drives the guide plate 406 to unfold downwards. The guide plate 406 naturally bends under gravity, increasing the shielding area. At the same time, the guide plates 406 on both sides can block raindrops blown by the side wind. Together with the inclined upper door panel 402, a larger rain-free buffer zone is formed in front of the box 1, which is convenient for staff to operate. After maintenance is completed, the lower door panel 410 is closed first, and then the edges of the upper door panel 402 and the lower door panel 410 are overlapped and closed to seal the inside of the box 1.

[0084] Pressure relief mechanism 5 includes:

[0085] T-shaped lock head 501 is rotatably connected to the outside of the housing 1, and one end of the T-shaped lock head 501 is provided with a protrusion 502;

[0086] Pressure relief valve 503 is installed on one side of the housing 1 near the T-type lock head 501. Pressure relief valve 503 has a pressure relief hole 504 on its outside. The valve body of pressure relief valve 503 is made of carbon steel with good corrosion resistance.

[0087] When in use, rotate the T-lock 501 to press the pressure relief valve 503 to adjust the air pressure inside and outside the box 1. This ensures that when the staff opens the box door, the internal and external pressures of the box 1 can be quickly balanced, avoiding abnormal damage to components and personal injury caused by pressure differences. After the pressure is released, pull the T-lock 501 to open the upper door panel 402 for maintenance.

[0088] Example 2, please refer to Figures 1-8 The present invention provides a technical solution: based on embodiment 1, the shrinkage component 604 includes:

[0089] Folding cylinder 6041 is installed inside the bent tube 601. The outside of the folding cylinder 6041 is in contact with the inside of the bent tube 601. The sides of the folding cylinder 6041 are made of rubber. The top opening is connected to the air intake 606. The bottom is set as a rigid circular plate.

[0090] Vertical rod 6042 is evenly arranged inside the folding tube 6041. The other end of the vertical rod 6042 is connected to the inner wall of the bent tube 601. The vertical rod 6042 is elastic and stretches when the folding tube 6041 is unfolded.

[0091] The connecting rod 6043 is installed in the middle of the inside of the folding tube 6041. The other end of the connecting rod 6043 passes through the air intake 606 of the bent tube 601. Both the connecting rod 6043 and the vertical rod 6042 are made of lightweight materials.

[0092] Shrink assembly 604 also includes:

[0093] Marker ball 6044 is installed above connecting rod 6043;

[0094] Pointer 6045 is installed above the marker ball 6044. The position of pointer 6045 corresponds to that on the scale plate 605. The pointer 6045 is moved to different positions on the scale plate 605 according to the movement of the folding cylinder 6041.

[0095] The touch rod 6046 is installed below the folding cylinder 6041, and the bottom of the touch rod 6046 contacts the top of the drive block 602.

[0096] When the inside of the housing 1 is under negative pressure, the pressure difference between the inside and outside of the folding cylinder 6041 causes it to extend downwards along the bend 601, pulling the vertical rod 6042 to stretch. This places the connecting rod 6043 inside the folding cylinder 6041 and the bend 601, causing the marker ball 6044 and pointer 6045 to move downwards to the bottom of the scale plate 605. When the pressure remains constant, the touch lever 6046 contacts the top of the drive block 602. By maintaining the negative pressure, the touch lever 6046 remains pressed against the top of the drive block 602, thus keeping the warning light 603 constantly lit, allowing staff to see it from a distance. The presence of warning light 603 indicates that the interior of chamber 1 is under negative pressure. After prolonged periods of stillness, due to changes in air pressure and environment, the pressure inside chamber 1 changes. When this occurs, the pressure lever 6046 moves away from the drive block 602, causing the warning light 603 to go out. This indicates that the pressure inside chamber 1 has changed and has not reached the target air pressure, but it is still under negative pressure. Workers can also judge the pressure by the pointer 6045 on the indicator ball 6044. If the position of the indicator ball 6044 is too high, it indicates that the pressure difference between the inside and outside is small, and the sealing of chamber 1 needs to be checked. This allows workers to easily observe the pressure changes inside chamber 1 with the naked eye.

[0097] The specific workflow is as follows:

[0098] During operation, the opening and closing mechanism 4 is closed and locked. Then, the vacuum pump 3 evacuates the inside of the chamber 1. When the pressure inside the chamber 1 reaches the target vacuum pressure value, the vacuum pump 3 is stopped and the solenoid valve is used to maintain the seal. When the negative pressure is drawn and the pressure is maintained inside the chamber 1, the pressure on both sides of the shrinking component 604 is inconsistent, causing deformation. This causes the shrinking component 604 to move downward in the bend 601 and touch the drive block 602. The shrinking component 604 is subjected to negative pressure and presses the drive block 602, thereby opening the switch inside the drive block 602 and illuminating the warning light 603. It can be observed from a distance that the inside of the chamber 1 is under negative pressure. When the pressure inside the chamber 1 is insufficient, the shrinking component 604 moves upward with the pressure change, causing the warning light 603 to go out. At this time, the relative position of the shrinking component 604 and the scale plate 605 can also be used to determine whether the inside of the chamber 1 is under negative pressure and whether the pressure meets the standard. Then, the pressure can be released or the vacuum pump 3 can be turned on again.

[0099] When maintenance is required, the staff approaches the box 1 and judges whether the inside of the box 1 is under negative pressure by observing the scale of the visual warning mechanism 6. Then, they turn the T-lock 501 to press the pressure relief valve 503 to adjust the air pressure inside and outside the box 1, ensuring that the box 1 can quickly balance the internal and external pressure when the staff opens the box door.

[0100] The upper door panel 402 is opened by the pressure relief mechanism 5, and then the lower door panel 410 is opened by pulling the handle 7. After the upper and lower door panels are opened, the connecting block 407 above the upper door panel 402 drives the guide plate 406 to unfold downward. The guide plate 406 bends naturally under gravity, increasing the shielding area. At the same time, the guide plates 406 on both sides can block raindrops blown by the side wind. Together with the inclined upper door panel 402, a larger rain-free buffer zone is formed in front of the box 1, which is convenient for the staff to operate. After the maintenance is completed, the lower door panel 410 is closed first, and then the edges of the upper door panel 402 and the lower door panel 410 are overlapped and closed, so that the upper and lower door panels seal the inside of the box 1.

[0101] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A vacuum terminal box, comprising a box body (1), characterized in that, Also includes: The opening and closing mechanism (4) is symmetrically arranged inside the box (1) and the visual warning mechanism (6) is installed on one side of the box (1). The visual warning mechanism (6) includes a curved tube (601) disposed inside the housing (1), an air intake hole (606) and a retraction component (604) installed inside the curved tube (601) on the top of the curved tube (601).

2. The vacuum terminal box according to claim 1, characterized in that: Also includes: Top plate (2), the top plate (2) is disposed above the box body (1); A vacuum pump (3) is installed on one side of the housing (1); Pressure relief mechanism (5) is installed outside the opening and closing mechanism (4).

3. The vacuum terminal box according to claim 2, characterized in that: The visual warning mechanism (6) also includes: A drive block (602) is installed inside the bend (601) and is positioned below the shrink assembly (604); A scale plate (605) is mounted above the bend (601); Warning light (603) is mounted on the outside of the drive block (602).

4. The vacuum terminal box according to claim 1, characterized in that: The opening and closing mechanism (4) includes: Shaft (401), the shaft (401) is symmetrically arranged inside the housing (1), the shaft (401) is installed inside the housing (1); Bending rods (409), bending rods (409) are uniformly arranged on the outside of the shaft (401). The upper door panel (402) is located at the other end of the bent rod (409), and a groove (408) is provided inside the upper door panel (402).

5. The vacuum terminal box according to claim 4, characterized in that: The opening and closing mechanism (4) also includes: An outwardly protruding edge (403) is provided at the bottom of the upper door panel (402); A strip-shaped sealing strip (404) is disposed inside the outer protruding edge (403); L-shaped sealing strip (405) is symmetrically arranged on the surface of the upper door panel (402), and the L-shaped sealing strip (405) is installed on the inner side of the upper door panel (402).

6. The vacuum terminal box according to claim 5, characterized in that: The opening and closing mechanism (4) also includes: Guide plate (406), the guide plate (406) is symmetrically arranged inside the upper door panel (402), and the outside of the guide plate (406) is slidably connected to the inside of the groove (408) of the upper door panel (402); A connecting block (407) is installed above the guide plate (406), and the outside of the connecting block (407) is slidably connected to the surface of the upper door panel (402).

7. The vacuum terminal box according to claim 6, characterized in that: The opening and closing mechanism (4) also includes: A handle (7) is mounted on the outside of the lower door panel (410); The lower door panel (410) is installed at the other end of the bent rod (409). The lower door panel (410) is located below the upper door panel (402). An inner protruding edge (411) is provided on the upper part of the lower door panel (410).

8. The vacuum terminal box according to claim 2, characterized in that: The pressure relief mechanism (5) includes: T-shaped lock head (501), the T-shaped lock head (501) is rotatably connected to the outside of the box body (1), and one end of the T-shaped lock head (501) is provided with a protrusion (502). Pressure relief valve (503) is installed on one side of the housing (1) near the T-type lock head (501), and a pressure relief hole (504) is provided on the outside of the pressure relief valve (503).

9. The vacuum terminal box according to claim 1, characterized in that: The shrinkage assembly (604) includes: A folding tube (6041) is installed inside a bend (601), and the outside of the folding tube (6041) is in contact with the inside of the bend (601). Vertical rod (6042) is evenly arranged inside the folding tube (6041), and the other end of the vertical rod (6042) is connected to the inner wall of the bent tube (601); A connecting rod (6043) is installed in the middle of the inside of the folding tube (6041), and the other end of the connecting rod (6043) passes through the air intake hole (606) of the bent tube (601).

10. The vacuum terminal box according to claim 9, characterized in that: The shrinkage assembly (604) further includes: A marker ball (6044) is mounted above a connecting rod (6043); A pointer (6045) is mounted above a marker ball (6044); A pressure rod (6046) is installed below the folding cylinder (6041), and the bottom of the pressure rod (6046) contacts the top of the drive block (602).

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