Modular stainless steel tank air-tight ring main unit

Abstract

This invention relates to the field of ring main unit technology and discloses a modular stainless steel airtight ring main unit, including a cabinet body. A spring strip is slidably engaged with the left front wall of the cabinet body, and a cabinet door is movably hinged to the spring strip. A backing plate is fixedly connected to the inner side of the cabinet door. The inner wall of the cabinet body port has a sealing gap corresponding to the outer periphery of the backing plate. A main sealing ring is fixedly connected to the edge of the backing plate. A frame is slidably connected to the inner wall of the cabinet door, movably abutting against the outer periphery of the backing plate. When the cabinet door is opened, the frame, in conjunction with the backing plate, surrounds and seals the main sealing ring, effectively preventing impurities from the air and those caused by operation from adhering to the surface of the main sealing ring. After the cabinet door is closed, a drying component cleans the dust in the sealing gap and dries the sealing end face. Then, an adjusting component exposes the main sealing ring, causing it to deform evenly and adhere to the inner wall of the cabinet body port, thus achieving cleaning and protection of the main sealing ring and greatly improving sealing performance.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, specifically to a modular stainless steel airtight ring main unit. Background Technology

[0002] An airtight ring main unit (RMU) is a compact high-voltage switchgear used in power distribution networks (especially 10kV and below medium-voltage distribution systems). Its core feature is that key electrical components such as circuit breakers, load switches, disconnectors, and instrument transformers are entirely sealed within an airtight metal casing made of stainless steel or aluminum alloy, filled with dry sulfur hexafluoride gas or nitrogen as insulation and arc-quenching medium. Its design follows the principles of "fully sealed, maintenance-free, and miniaturized," and it is widely used in urban power grid upgrades, new energy source integration, and user-side power distribution systems.

[0003] Chinese patent application CN120237557A discloses a sealing structure for an environmentally friendly gas ring main unit, relating to the field of ring main unit technology. It includes a door structure comprising a door frame and a door panel. A folded sealing tube is circumferentially arranged on the surface of the door frame. The folded sealing tube is corrugated, and at least two telescopic outer tubes are provided at one end of each tube. A rotating pin is slidably connected inside each telescopic outer tube. A hinge is rotatably connected to the end of each rotating pin extending beyond the telescopic outer tube. The hinge is connected to the door panel. A locking mechanism is provided between the telescopic outer tubes and the rotating pins to secure them. Several magnetic plates are provided on the side of the door panel facing the door frame, and an abutment plate is provided on the side of the folded sealing tube away from the door frame. The abutment plate has a recessed groove on its surface for the magnetic plates to abut against, and the magnetic plates are magnetically attracted to the inner wall of the recessed groove. This application improves the sealing performance of the environmentally friendly gas ring main unit and reduces the probability of leakage.

[0004] The sealing structure of the environmentally friendly gas ring main unit in the aforementioned patent requires opening the cabinet door during initial electrical component installation and subsequent maintenance. The folded sealing tubes and other sealing components, as well as the sealing contact surfaces, are directly exposed when the door is open. This makes them susceptible to contamination from airborne dust and other impurities, as well as from handling and contact. Furthermore, high external humidity can cause moisture to accumulate on the contact surfaces between the seals and the sealing surfaces. All of these factors can compromise the seal's fit, lead to corrosion or aging of the seals, shorten their lifespan, reduce sealing strength, and ultimately result in leakage of the gas medium filling the cabinet. Summary of the Invention

[0005] The purpose of this invention is to address the problem that, in the use of conventional airtight ring main units, the sealing components and sealing end faces are directly exposed when the cabinet door is opened, making them susceptible to the effects of dust, impurities, and moisture, which can lead to a reduction in sealing performance. This invention provides a modular stainless steel enclosure airtight ring main unit.

[0006] To achieve the above objectives, the present invention specifically adopts the following technical solution:

[0007] A modular stainless steel airtight ring main unit includes a cabinet body. A spring strip is slidably engaged with the left front wall of the cabinet body. A cabinet door is movably hinged to the spring strip. A backing plate is fixedly connected to the inner side of the cabinet door. The inner wall of the cabinet body port has a sealing gap corresponding to the outer periphery of the backing plate. A main sealing ring is fixedly connected to the edge of the backing plate. A frame that movably abuts against the outer periphery of the backing plate is slidably connected to the inner wall of the cabinet door. A pressure frame that movably abuts against the main sealing ring is slidably connected to the inner wall of the frame. A locking post is fixedly connected to the right front wall of the cabinet body. A spring-loaded locking block corresponding to the locking post is slidably engaged in the right wall of the cabinet door. An adjustment component is provided on the front wall of the cabinet door for exposing and pressing the main sealing ring, and for unlocking the spring-loaded locking block.

[0008] The bottom of the frame is fixedly connected to a partition that can be inserted into the sealing gap. The bottom inner wall of the sealing gap is provided with a partition block. The bottom of the cabinet door has a cavity, in which a wind-drying component is provided to clean and dry the dust in the sealing gap.

[0009] Furthermore, the middle part of the backing plate protrudes towards the cabinet door, and the front wall has protruding pillars on all four sides that connect to the cabinet door. The inner side of the cabinet port has an inner edge corresponding to the backing plate, and an inner sealing gasket is provided on the front wall of the inner edge. An outer sealing gasket is provided on the front wall of the cabinet.

[0010] Furthermore, the edge of the main sealing ring does not extend beyond the edge of the abutment plate, the main sealing ring is inclined toward the side of the cabinet door, the main sealing ring and the sealing gap have matching rounded corners around them, and the pressure frame also has rounded corners around it. The outer wall of the abutment plate is slidably connected to the pressure frame.

[0011] Furthermore, the adjustment assembly includes an outer guide groove on the left and right side walls of the frame and an inner guide groove on the left and right side walls of the pressure frame. A pin frame is movably engaged between the outer guide groove and the inner guide groove. The pin frame has pin rods at both ends. The pin rods are slidably engaged with the inner walls of the cabinet door. An adjustment disc is rotatably connected to the inner wall of the cabinet door. The inner wall of the adjustment disc is provided with a pin protrusion that is movably engaged with the pin frame. A crank that passes through the cabinet door is fixedly connected to the center of the adjustment disc.

[0012] Furthermore, the outer guide groove is composed of an outer vertical groove one, an outer inclined groove, and an outer vertical groove two connected from top to bottom, and the inner guide groove is composed of an inner vertical groove and an inner inclined groove connected from top to bottom. The outer inclined groove is inclined backward and the inner inclined groove is inclined forward. The upper and lower ends of the outer guide groove and the inner guide groove are at the same height, and the upper and lower ends of the outer vertical groove two and the inner inclined groove are at the same height.

[0013] Furthermore, two circumferentially arranged limiting grooves are provided on the left side of the front wall of the cabinet door, and a spring column that is slidably engaged with the upper limiting groove is located on the side of the crank front end away from the axis.

[0014] Furthermore, the right wall of the cabinet door has a locking cavity, the elastic lock block is located on the right wall of the locking cavity, the rear wall of the locking cavity has a through hole adapted to the locking post, the right wall of the locking post has a locking slot that can engage with the elastic lock block, the left rear side of the elastic lock block has a first inclined surface, the lower wall of the elastic lock block has a wedge groove including a second inclined surface, the pin at the right end of the pin frame is inserted into the locking cavity, and the upper end of the pin is fixedly connected to a top rod that movably abuts against the second inclined surface.

[0015] Furthermore, the front wall of the cabinet door is integrally formed with a handle, and the rear side of the handle has a movable cavity. A U-shaped elastic bracket is slidably engaged in the movable cavity. The left end of the elastic bracket is inserted into the adjustment plate. The front wall has a corresponding locking groove, and the right end of the elastic bracket is inserted into the locking cavity opposite to the locking post.

[0016] Furthermore, the air-drying assembly includes a return air duct and a supply air duct fixedly inserted into the rear wall of the cavity and capable of communicating with the sealing gap. The rear ports of the return air duct and the supply air duct are respectively close to both sides of the partition and are each equipped with a solenoid valve. An actuating block for electrically feedback-controlled opening of the solenoid valve is installed on the rear wall of the movable cavity. A miniature fan installed in the cavity is fixedly connected to the front end of the supply air duct. An outer filter cartridge is threadedly connected to the left air inlet of the miniature fan. A sleeve threadedly connected to the front end of the return air duct is slidably snapped onto the outer periphery of the left end of the outer filter cartridge. An inner filter cartridge is slidably inserted into the left end of the outer filter cartridge. A desiccant-containing drying bladder is provided between the inner walls of the inner filter cartridge and the outer filter cartridge. The desiccant is made of non-woven fabric. The left end of the inner filter cartridge is expanded and its diameter is the same as the diameter of the front port of the return air duct.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention, when the cabinet door is opened, uses a frame and a stop plate to surround and seal the main sealing ring, effectively preventing various impurities in the air and those caused by operation from adhering to the surface of the main sealing ring. After the cabinet door is closed, the adjusting component causes the frame to first contract and expose the main sealing ring, and then causes the pressure frame to squeeze the main sealing ring to deform evenly and fit it against the inner wall of the cabinet port, thereby achieving cleaning and protection of the main sealing ring and greatly improving the sealing performance.

[0019] This invention locks the cabinet door by automatically positioning the locking pin against the spring-loaded locking block when the cabinet door is closed and pressed against the front wall of the cabinet. A corresponding abutment plate is inserted into the cabinet port, and a U-shaped and relatively sealed gap is automatically formed on the inner wall of the cabinet port. The partition plate and the partition block separate the bottom of the sealed gap, which facilitates the control of airflow circulation with the air drying component. Before the sealing structure takes effect, the floating dust in the sealed gap is cleaned and the sealing end face is dried, thereby further improving the sealing performance. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the ring main unit of the present invention;

[0021] Figure 2 This is a three-dimensional sectional view of the ring main unit cabinet of the present invention;

[0022] Figure 3 This is a three-dimensional sectional view of the ring main unit cabinet and cabinet door of the present invention;

[0023] Figure 4 This is a three-dimensional sectional view of the ring main unit door and the main sealing ring of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of the ring main unit pin frame and elastic locking block of the present invention;

[0025] Figure 6 This is an exploded three-dimensional view of the ring main unit frame and the pressure frame of the present invention;

[0026] Figure 7 This is a three-dimensional structural diagram of the ring main unit back plate and main sealing ring of the present invention;

[0027] Figure 8 This is a three-dimensional sectional view of the ring main unit frame and the pressure frame of the present invention;

[0028] Figure 9 This is a three-dimensional sectional view of the return air duct and supply air duct of the ring main unit of the present invention;

[0029] Figure 10 This is a three-dimensional sectional view of the outer filter cylinder and sleeve of the ring main unit of the present invention.

[0030] Reference numerals: 1. Cabinet body; 11. Inner sealing gasket; 12. Outer sealing gasket; 13. Locking post; 14. Elastic strip; 2. Cabinet door; 21. Backing plate; 22. Main sealing ring; 23. Enclosure frame; 24. Outer guide groove; 25. Partition plate; 26. Pressure frame; 27. Inner guide groove; 3. Adjusting disc; 31. Pin protrusion; 32. Pin frame; 33. Top rod; 34. Crank; 35. Elastic column; 4. Elastic locking block; 5. Elastic bracket; 6. Actuating block; 7. Return air duct; 71. Supply air duct; 72. Solenoid valve; 73. Miniature fan; 74. Outer filter cartridge; 75. Sleeve; 76. Inner filter cartridge; 77. Desiccant. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1, as Figures 1-10 As shown, a modular stainless steel airtight ring main unit includes a cabinet body 1. A spring strip 14 is slidably engaged with the left front wall of the cabinet body 1. A cabinet door 2 is movably hinged to the spring strip 14. A backing plate 21 is fixedly connected to the inner side of the cabinet door 2. The inner wall of the cabinet body 1 has a sealing gap corresponding to the outer periphery of the backing plate 21. A main sealing ring 22 is fixedly connected to the edge of the backing plate 21. A frame 23 is slidably connected to the inner wall of the cabinet door 2 and movably abuts against the outer periphery of the backing plate 21. A pressure frame 26 is slidably connected to the inner wall of the frame 23 and movably abuts against the main sealing ring 22. A locking post 13 is fixedly connected to the right front wall of the cabinet body 1. A spring locking block 4 corresponding to the locking post 13 is slidably engaged in the middle of the right wall of the cabinet door 2. An adjustment component is provided on the front wall of the cabinet door 2 to squeeze the main sealing ring 22 after it is exposed and to unlock the spring locking block 4.

[0033] The bottom of the frame 23 is fixedly connected to a partition 25 that can be inserted into the sealing gap. The bottom inner wall of the sealing gap is provided with a partition block. The bottom of the cabinet door 2 has a cavity, and a drying component for cleaning and drying the dust in the sealing gap is provided in the cavity.

[0034] Initially, cabinet door 2 is in an open state. The frame 23, together with the abutment plate 21, surrounds and seals the main sealing ring 22. This ensures that when cabinet door 2 is opened due to initial electrical component installation or subsequent maintenance, various impurities in the air and those caused by operation can be effectively prevented from adhering to the surface of the main sealing ring 22, and reduces the risk of moisture intrusion. When it is necessary to close cabinet door 2, the angle between cabinet door 2 and spring strip 14 is controlled to be 90 degrees, and cabinet door 2 is pressed towards one side of cabinet body 1. This allows the locking post 13 and spring lock block 4 to lock cabinet door 2. After locking, cabinet door 2 is directly attached to the front wall of cabinet body 1, and the corresponding abutment plate 21 is inserted into the cabinet. In the cabinet 1 port, the inner wall of the cabinet 1 port automatically forms a U-shaped and relatively sealed gap. The partition 25, together with the partition block, isolates the bottom of the sealed gap. The operation of the control air drying component drives the airflow circulation in the sealed gap, thereby cleaning the floating dust in the sealed gap and drying the sealing end face, i.e., the inner wall of the cabinet 1, before sealing, to ensure a good sealing foundation. Subsequently, the control adjustment component drives the frame 23 to first shrink and expose the main sealing ring 22, and then drives the pressure frame 26 to squeeze the main sealing ring 22 to deform evenly and fit it to the inner wall of the cabinet 1 port, thereby ensuring the cleanliness of the sealing connection surface and greatly improving the sealing performance.

[0035] In the second embodiment, based on the above embodiment, the middle part of the back plate 21 protrudes towards the cabinet door 2, and the front wall has protruding pillars on all four sides that are connected to the cabinet door 2. The inner side of the cabinet body 1 port has an inner edge corresponding to the back plate 21, and an inner sealing gasket 11 is provided on the front wall of the inner edge. An outer sealing gasket 12 is provided on the front wall of the cabinet body 1.

[0036] When the cabinet door 2 is closed, the edge of the abutment plate 21 automatically abuts against the inner edge of the cabinet body 1 port, and the cabinet door 2 fits against the front wall of the cabinet body 1. Due to the presence of the inner sealing gasket 11 and the outer sealing gasket 12, not only can the inner and outer gaps of the sealing gap be sealed, improving the airtightness of the sealing gap and ensuring the effect of the air drying component in cleaning and drying the dust in the sealing gap, but it can also work with the main sealing ring 22 to provide two additional seals for the closure of the cabinet door 2, improving the sealing performance.

[0037] In the third embodiment, based on the above embodiments, the edge of the main sealing ring 22 does not extend beyond the edge of the abutment plate 21, the main sealing ring 22 is inclined toward the side of the cabinet door 2, the main sealing ring 22 and the sealing gap have matching rounded corners around them, and the pressure frame 26 also has rounded corners around it. The outer wall of the abutment plate 21 is slidably connected to the pressure frame 26.

[0038] This design facilitates the contact between the frame 23 and the edge of the abutment plate 21, forming a reliable enclosure seal for the main sealing ring 22. After the frame 23 retracts and moves, the pressure frame 26 can fully compress the inclined main sealing ring 22, causing the main sealing ring 22 to deform evenly outward.

[0039] In embodiment four, based on the above embodiments, the adjustment component includes an outer guide groove 24 on the left and right side walls of the frame 23 and an inner guide groove 27 on the left and right side walls of the pressure frame 26. A pin frame 32 is movably engaged between the outer guide groove 24 and the inner guide groove 27. The pin frame 32 has pins at both ends. The pins are slidably engaged with the inner walls of the cabinet door 2. An adjustment plate 3 is rotatably connected to the inner wall of the cabinet door 2. The inner wall of the adjustment plate 3 is provided with a pin protrusion 31 that is movably engaged with the pin frame 32. A crank 34 that passes through the cabinet door 2 is fixedly connected to the middle of the adjustment plate 3.

[0040] The outer guide groove 24 is composed of an outer vertical groove 1, an outer inclined groove, and an outer vertical groove 2 connected from top to bottom. The inner guide groove 27 is composed of an inner vertical groove and an inner inclined groove connected from top to bottom. The outer inclined groove is inclined backward and the inner inclined groove is inclined forward. The upper and lower ends of the outer guide groove 24 and the inner guide groove 27 are at the same height. The upper and lower ends of the outer vertical groove 2 and the inner inclined groove are at the same height.

[0041] When cabinet door 2 is closed, the pins at both ends of the initial pin frame 32 are engaged in the top of the outer inclined groove and the middle area of ​​the inner vertical groove. The control crank 34 drives the adjusting plate 3 to rotate counterclockwise. The pin protrusion 31 then presses the pin frame 32, causing the pin to move downward. The pin first presses the outer inclined groove and moves downward along the inner vertical groove. The surrounding frame 23 moves forward and contracts relative to the main sealing ring 22 to avoid displacement, while the pressure frame 26 remains fixed. When the pin moves down to the outer vertical groove and presses the inner inclined groove, the surrounding frame 23 moves forward the maximum distance and remains fixed, moving away from the outside of the main sealing ring 22. The pressure frame 26 moves forward and presses the main sealing ring 22, causing the main sealing ring 22 to expand outward for sealing. This achieves step-by-step driving and avoids wear on the main sealing ring 22.

[0042] In Example 5, based on the above examples, two circumferentially arranged limiting grooves are provided on the left side of the front wall of the cabinet door 2, and a spring column 35 that is slidably engaged with the upper limiting groove is located on the side of the front end of the crank 34 away from the axis.

[0043] When the cabinet door 2 is open, the upper limiting groove can limit the elastic column 35, and the frame 23 stably surrounds and seals the main sealing ring 22, preventing the main sealing ring 22 from being accidentally exposed. When the cabinet door 2 is closed, and the elastic column 35 is pulled out to control the counterclockwise rotation of the crank 34 to drive the main sealing ring 22 to expand outward for sealing, the elastic column 35 is just in front of the lower limiting groove, and automatically inserts into the limiting groove under its own elastic force, thereby locking the sealing state of the main sealing ring 22.

[0044] In embodiment six, based on the above embodiment, the right wall of the cabinet door 2 has a locking cavity, the elastic lock block 4 is located on the right wall of the locking cavity, the rear wall of the locking cavity has a through hole adapted to the locking post 13, the right wall of the locking post 13 has a locking slot that can engage with the elastic lock block 4, the left rear side of the elastic lock block 4 has a first inclined surface, the lower wall of the elastic lock block 4 has a wedge groove including a second inclined surface, the pin at the right end of the pin frame 32 is inserted into the locking cavity, and the upper end of the pin is fixedly connected to a top rod 33 that movably abuts against the second inclined surface.

[0045] When the cabinet door 2 is closed, the locking pin 13 passively passes through the through hole and presses the inclined surface of the elastic locking block 4. The elastic locking block 4 automatically retracts and, after the locking pin 13 is fully inserted into the locking cavity, resets and engages with the locking slot, thereby safely locking the cabinet door 2. During this period, the elastic locking block 4 retracts and drives the wedge groove to move to the right synchronously, but does not interfere with the top rod 33. When the cabinet door 2 needs to be opened later, the crank 34 can be controlled to rotate clockwise, driving the pin frame 32 to move the top rod 33 upward. The top rod 33 presses the inclined surface 2, which also drives the elastic locking block 4 to retract and move to the right. Together with the compressed elastic strip 14, it applies an outward force to the cabinet door 2, and the cabinet door 2 automatically moves away from the front wall of the cabinet body 1 and opens. During this period, the pin frame 32 drives the pin rod to move upward along the outer vertical groove 1 in the outer guide groove 24 and the inner vertical groove in the inner guide groove 27. Whether the cabinet door 2 is opened from the locked state or from the locked and sealed state, the main sealing ring 22 is always in the surrounding sealing state first, and the protection of the main sealing ring 22 is reliable and stable.

[0046] In embodiment seven, based on the above embodiments, the front wall of the cabinet door 2 is integrally formed with a handle, and the rear side of the handle has a movable cavity. A U-shaped elastic bracket 5 is slidably engaged in the movable cavity. The left end of the elastic bracket 5 is inserted into the adjustment plate 3, and the front wall has a corresponding locking groove. The right end of the elastic bracket 5 is inserted into the locking cavity and is opposite to the locking post 13.

[0047] When cabinet door 2 is closed, the locking post 13 passively compresses the elastic bracket 5 to retract, and the elastic bracket 5 disengages from the locking groove on the adjusting plate 3, thereby automatically releasing the locking of the adjusting plate 3. The adjusting plate 3 can be controlled to rotate freely in two directions to unlock or seal cabinet door 2.

[0048] When the cabinet door 2 is initially open, the spring clip 5 engages with the locking groove on the adjusting plate 3, preventing the adjusting plate 3 from deflecting. When the cabinet door 2 is just opened, and the control crank 34 drives the adjusting plate 3 to rotate in the deflectable direction, i.e., counterclockwise, the locking groove on the adjusting plate 3 is also locked again when it passes the spring clip 5. Therefore, it is ensured that when the cabinet door 2 is open, the crank 34 cannot be rotated to expose the main sealing ring 22, making it safe and reliable to use.

[0049] Example 8: Based on the above examples, the air-drying assembly includes a return air duct 7 and a supply air duct 71 fixedly inserted into the rear wall of the cavity and capable of communicating with the sealing gap. The rear ports of the return air duct 7 and the supply air duct 71 are respectively close to both sides of the partition 25 and are each equipped with a solenoid valve 72. An actuating block 6 for opening the solenoid valve 72 by electrical feedback is installed on the rear wall of the movable cavity. A miniature fan 73 installed in the cavity is fixedly connected to the front end of the supply air duct 71. An outer filter cartridge 74 is threadedly connected to the air inlet at the left end of the miniature fan 73. A sleeve 75 threadedly connected to the front end of the return air duct 7 is slidably snapped onto the outer periphery of the left end of the outer filter cartridge 74. An inner filter cartridge 76 is slidably inserted into the left end of the outer filter cartridge 74. A desiccant-containing desiccant bladder 77 is provided between the inner wall of the inner filter cartridge 76 and the inner wall of the outer filter cartridge 74. The desiccant bladder 77 is made of non-woven fabric. The left end of the inner filter cartridge 76 is expanded and its diameter is the same as the diameter of the front port of the return air duct 7.

[0050] When cabinet door 2 is closed, partition 25 abuts against the partition block, thereby isolating the bottom of the sealing gap. The elastic bracket 5 presses against the trigger block 6, and the trigger block 6 controls the opening of the solenoid valves 72 on both sides, controlling the operation of the micro fan 73. The air supply pipe 71 blows high-speed airflow into the right side of the partition. The airflow carries the floating dust and other impurities in the sealing gap to flow around quickly, enters the return air pipe 7 through the left side of the partition, and is filtered by the inner filter cartridge 76 and dried by the drying bag 77 before circulating. This quickly removes floating dust and moisture from the sealing gap before sealing, ensuring a good sealing foundation and improving sealing strength. When cabinet door 2 is opened, the elastic bracket 5 disengages from the trigger block 6, and the solenoid valves 72 on both sides close again, thus preventing the drying bag 77 from being exposed to moisture from the outside.

[0051] The threads of the outer filter cartridge 74 and sleeve 75 are removable, making it easy to remove and clean the inner filter cartridge 76 and replace the dryer bladder 77. At the same time, the design of the inner filter cartridge 76 being expanded at the left end and having the same diameter as the front end of the return air duct 7 prevents the inner filter cartridge 76 from accidentally sliding into the return air duct 7, making it convenient and safe to use.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A modular stainless steel airtight ring main unit, comprising a cabinet (1), characterized in that, The cabinet (1) has a spring strip (14) slidably attached to the left front wall. The spring strip (14) is hinged to a cabinet door (2). The cabinet door (2) is fixedly connected to the inner side of the cabinet door (2). The inner wall of the cabinet (1) has a sealing gap corresponding to the outer periphery of the backing plate (21). The edge of the backing plate (21) is fixedly connected to a main sealing ring (22). The inner wall of the cabinet door (2) is slidably connected to a frame (23) that movably abuts against the outer periphery of the backing plate (21). The inner wall of the frame (23) is slidably connected to a pressure frame (26) that movably abuts against the main sealing ring (22). The cabinet (1) has a locking post (13) fixedly attached to the right front wall. The cabinet door (2) has a spring lock block (4) slidably attached to the right wall, corresponding to the locking post (13). The front wall of the cabinet door (2) is provided with an adjustment component for exposing the main sealing ring (22) and squeezing it, as well as for unlocking the spring lock block (4). The adjustment assembly includes an outer guide groove (24) on the left and right side walls of the frame (23) and an inner guide groove (27) on the left and right side walls of the pressure frame (26). A pin frame (32) is movably engaged between the outer guide groove (24) and the inner guide groove (27). The pin frame (32) has pins at both ends. The pins are slidably engaged with the inner walls of the cabinet door (2). An adjustment plate (3) is rotatably connected to the inner wall of the cabinet door (2). The inner wall of the adjustment plate (3) is provided with a pin protrusion (31) that is movably engaged with the pin frame (32). A crank (34) that passes through the cabinet door (2) is fixedly connected to the middle of the adjustment plate (3). The outer guide groove (24) is composed of an outer vertical groove one, an outer inclined groove and an outer vertical groove two connected from top to bottom. The inner guide groove (27) is composed of an inner vertical groove and an inner inclined groove connected from top to bottom. The outer inclined groove is inclined backward and the inner inclined groove is inclined forward. The upper and lower ends of the outer guide groove (24) and the inner guide groove (27) are at the same height. The upper and lower ends of the outer vertical groove two and the inner inclined groove are at the same height. The bottom of the frame (23) is fixedly connected to a partition (25) that can be inserted into the sealing gap. The bottom inner wall of the sealing gap is provided with a partition block. The bottom of the cabinet door (2) has a cavity, and a drying component for cleaning and drying the dust in the sealing gap is provided in the cavity.

2. The modular stainless steel enclosure airtight ring main unit according to claim 1, characterized in that, The middle part of the back plate (21) protrudes towards the cabinet door (2), and the front wall has protruding columns connected to the cabinet door (2) on all four sides. The inner side of the cabinet (1) port has an inner edge corresponding to the back plate (21), and an inner sealing gasket (11) is provided on the front wall of the inner edge. An outer sealing gasket (12) is provided on the front wall of the cabinet (1).

3. A modular stainless steel airtight ring main unit according to claim 2, characterized in that, The edge of the main sealing ring (22) does not extend beyond the edge of the abutment plate (21). The main sealing ring (22) is inclined toward the side of the cabinet door (2). The main sealing ring (22) and the sealing gap have matching rounded corners around them. The pressure frame (26) also has rounded corners around it. The outer wall of the abutment plate (21) is slidably connected to the pressure frame (26).

4. A modular stainless steel enclosure airtight ring main unit according to claim 3, characterized in that, The cabinet door (2) has two circumferentially arranged limiting grooves on the left side of the front wall, and the crank (34) has a spring column (35) that is movably engaged with the upper limiting groove on the side away from the axis at the front end.

5. A modular stainless steel enclosure airtight ring main unit according to claim 4, characterized in that, The cabinet door (2) has a locking cavity in the right wall. The elastic lock block (4) is located in the right wall of the locking cavity. The rear wall of the locking cavity has a through hole that matches the locking post (13). The right wall of the locking post (13) has a locking slot that can engage with the elastic lock block (4). The left rear side of the elastic lock block (4) has a slope one. The lower wall of the elastic lock block (4) has a wedge groove including a slope two. The pin at the right end of the pin frame (32) is inserted into the locking cavity, and the upper end of the pin is fixedly connected to a top rod (33) that movably abuts against the slope two.

6. A modular stainless steel enclosure airtight ring main unit according to claim 5, characterized in that, The cabinet door (2) has a handle integrally formed on the front wall. The handle has a movable cavity on the back side. A U-shaped elastic bracket (5) is slidably engaged in the movable cavity. The left end of the elastic bracket (5) is inserted into the adjustment plate (3). The front wall has a corresponding locking groove. The right end of the elastic bracket (5) is inserted into the locking cavity opposite to the locking post (13).

7. A modular stainless steel enclosure airtight ring main unit according to claim 6, characterized in that, The air-drying assembly includes a return air duct (7) and an air supply duct (71) fixedly inserted into the rear wall of the cavity and capable of communicating with the sealing gap. The rear ports of the return air duct (7) and the air supply duct (71) are respectively close to both sides of the partition (25) and are each equipped with a solenoid valve (72). An actuating block (6) for opening the solenoid valve (72) is installed on the rear wall of the movable cavity. A miniature fan (73) installed in the cavity is fixedly connected to the front end of the air supply duct (71). The miniature fan (73) is located on the left side. An external filter cartridge (74) is threadedly connected to the air inlet. A sleeve (75) threadedly connected to the front end of the return air pipe (7) is slidably snapped onto the outer periphery of the left end of the external filter cartridge (74). An inner filter cartridge (76) is slidably inserted into the left end of the external filter cartridge (74). A desiccant-containing desiccant bladder (77) is provided between the inner wall of the inner filter cartridge (76) and the inner wall of the external filter cartridge (74). The desiccant bladder (77) is made of non-woven fabric. The left end of the inner filter cartridge (76) is expanded and its diameter is the same as the diameter of the front end of the return air pipe (7).

Images