Pressure relief structure of high-low voltage switch cabinet

Abstract

The utility model belongs to the technical field of pressure relief structures, and particularly relates to a pressure relief structure of a high-low voltage switch cabinet, which comprises a cabinet body, a sealing door is hinged to the front surface of the cabinet body, two symmetrically distributed air ducts are fixedly connected to the top of the cabinet body, and an exhaust fan is mounted on the inner side of each air duct. The tops of the air ducts are connected with a net cover through threads, and a pressure relief cylinder is slidably connected to the top of the cabinet body and located between the two air ducts. According to the utility model, the top of the cabinet body is provided with the pressure relief cylinder, the cylinder wall of the pressure relief cylinder is provided with the through holes, the inner side of the pressure relief cylinder is provided with the sealing sleeve, and the sealing sleeve is supported by the kerosene glass tube. The kerosene glass tube is broken when the kerosene glass tube is broken, so that limitation on the sealing sleeve is relieved, air pressure in the cabinet body can be discharged through the through hole, and the purpose of internal pressure relief of the switch cabinet is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief structures, in particular to a pressure relief structure for a high and low voltage switch cabinet. Background Art

[0002] High-voltage switchgear is mainly used for high-voltage power switches and control equipment in power distribution systems. It usually includes high-voltage circuit breakers, disconnectors, load switches and control equipment. High-voltage switchgear can realize the distribution, control and protection of high-voltage power supply to ensure the safe and stable operation of the power system.

[0003] The utility model patent with announcement number CN209675724U discloses a high and low voltage switch cabinet, including a cabinet body, a wall panel structure, a plurality of heat dissipation mesh panels, a cover plate structure and at least one pressure relief plate, wherein the wall panel structure is vertically arranged on the top surface of the cabinet body around the pressure relief port of the cabinet top plate, and installation windows are respectively opened on its multiple side surfaces, and a plurality of heat dissipation mesh panels are installed in the multiple installation windows, the cover plate structure is connected to cover the top of the wall panel structure and extends to the periphery of the wall panel structure, the pressure relief plate is installed at the through hole position of the cover plate structure and covers the pressure relief port, and the switch cabinet adopting this technical solution enables hot air to pass through the heat dissipation holes on the heat dissipation mesh panel to play a role of vertical convection heat dissipation, with a large heat dissipation area and good heat dissipation effect, and with the help of the cover plate structure and the pressure relief plate, the pressure relief port and the peripheral position of the wall panel structure can be covered to play a role of waterproof and dustproof, thereby improving the protection level and use performance of the product.

[0004] However, in actual operation, the existing high-voltage switch cabinets often have internal fault arc accidents due to various external factors. The arc combustion releases huge energy in a short time, causing the gas inside the cabinet to expand and the pressure to increase sharply. It is far from enough to rely solely on its own heat dissipation mechanism. Therefore, improvements are needed. Utility Model Content

[0005] The utility model aims to provide a high and low voltage switch cabinet pressure relief structure, which solves the problem of slow pressure relief inside the existing high voltage switch cabinet.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high and low voltage switch cabinet pressure relief structure, including a cabinet body, a sealing door hinged on the front of the cabinet body, two symmetrically distributed air ducts are fixedly connected to the top of the cabinet body, and an exhaust fan is installed on the inner side of each air duct, the top of the air duct is connected with a mesh cover by a thread, the top of the cabinet body and the pressure relief cylinder is slidably connected between the two air ducts, the cylinder wall of the pressure relief cylinder is provided with a plurality of through holes distributed in a circular array, the top of the pressure relief cylinder is connected with a disassembly cover by a thread, the inner side of the pressure relief cylinder is slidably connected with a sleeve, the inner wall of the sleeve is fixedly connected with a plurality of fixing rods, and a support block is fixedly connected between the plurality of fixing rods, the upper end of the support block and the bottom of the disassembly cover are fixedly connected with a rubber plug, and a kerosene glass tube is commonly inserted between the rubber plugs.

[0007] Preferably, the left and right side walls of the cabinet are provided with heat dissipation holes, and the inner wall of the cabinet is fixedly connected with a partition net, which can play a certain dust-proof role.

[0008] Preferably, a rain shielding plate is fixedly connected to the upper outer portion of the pressure relief cylinder, and the rain shielding plate is made of stainless steel. The rain shielding plate can prevent rainwater from entering the pressure relief cylinder through the through hole.

[0009] Preferably, a retaining ring is fixedly connected to the lower outer side of the pressure relief cylinder, a sealing ring is embedded in the bottom of the retaining ring, and both the retaining ring and the sealing ring are in contact with the cabinet body. The arrangement of the retaining ring and the sealing ring has a sealing effect on the joint between the pressure relief cylinder and the cabinet body.

[0010] Preferably, the upper end of the support block and both sides of the kerosene glass tube are fixedly connected with guide sleeves, the inner side of each guide sleeve is slidably connected with a guide rod, the top of the guide rod is fixedly connected to the disassembly cover, and the inner side of the guide sleeve is provided with a spring 1, one end of the spring 1 is fixedly connected to the guide rod, and the other end of the spring 1 is fixedly connected to the inner surface of the guide sleeve. Through the provision of the spring 1, the tension can be applied to the envelope.

[0011] Preferably, a fixing sleeve is fixedly connected to the inner top of the cabinet and on both sides of the pressure relief cylinder, a latch is slidably connected to the inner side of the fixing sleeve, one end of the latch is plugged into the pressure relief cylinder, the other end of the latch is fixedly connected to a second spring, the end of the second spring away from the latch is fixedly connected to the inner surface of the fixing sleeve, and the end of the pin body of the latch is fixedly connected to a lever, which passes through the fixing sleeve and is slidably connected to the fixing sleeve. The latch is pulled laterally by the lever, the latch slides in the fixing sleeve, and the second spring is compressed, and then the state of the latch is maintained, and the pressure relief cylinder is inserted from the top of the cabinet until the retaining ring contacts the cabinet, and then the lever is released, the latch is reset under the action of the second spring, and inserted into the side wall of the pressure relief cylinder, thus completing the installation of the pressure relief cylinder.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model installs a pressure relief cylinder on the top of the cabinet, the cylinder wall of the pressure relief cylinder is provided with a through hole, and a seal is arranged on the inner side of the pressure relief cylinder, and the seal is supported by a kerosene glass tube. When the cabinet releases huge energy in a short time due to arc combustion, causing the gas inside the cabinet to expand and the pressure to increase suddenly, the kerosene glass tube will rupture, thereby releasing the restriction on the seal, so that the air pressure in the cabinet can be discharged through the through hole, so as to achieve the purpose of internal pressure relief of the switch cabinet.

[0014] 2. The utility model provides an annular retaining ring on the outer wall of the pressure relief cylinder, and embeds a sealing ring on the retaining ring. When the pressure relief cylinder is inserted into the cabinet, it is locked by an elastic latch on the inner side of the cabinet. In this way, the pressure relief cylinder can be disassembled and assembled by only pulling out and plugging the latch. The operation is simple and convenient, and it can be replaced after use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the utility model;

[0016] Figure 2 For the utility model Figure 1 A three-dimensional diagram of the local structure;

[0017] Figure 3 For the utility model Figure 1 A front cross-sectional view of

[0018] Figure 4 For the utility model Figure 3 A magnified view of the local structure;

[0019] Figure 5 For the utility model Figure 4 A magnified view of the structure of part A;

[0020] Figure 6 For the utility model Figure 4 A magnified view of the structure of part B;

[0021] Figure 7 For the utility model Figure 4 Bottom view of the envelope.

[0022] In the figure: 1. cabinet; 2. sealed door; 3. heat dissipation hole; 4. partition net; 5. air duct; 6. exhaust fan; 7. mesh cover; 8. pressure relief cylinder; 9. through hole; 10. rain shield; 11. removal cover; 12. sealing sleeve; 13. fixing rod; 14. supporting block; 15. rubber plug; 16. kerosene glass tube; 17. guide sleeve; 18. guide rod; 19. spring one; 20. retaining ring; 21. sealing ring; 22. fixing sleeve; 23. latch; 24. spring two; 25. lever. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1-Figure 3 A pressure relief structure for a high and low voltage switch cabinet includes a cabinet 1, a sealed door 2 is hinged on the front of the cabinet 1, heat dissipation holes 3 are provided on the left and right side walls of the cabinet 1, and a partition net 4 is fixedly connected to the inner wall of the cabinet 1. The partition net 4 can play a certain dust prevention role. Two symmetrically distributed air ducts 5 are fixedly connected to the top of the cabinet 1, and an exhaust fan 6 is installed on the inner side of each air duct 5. A mesh cover 7 is connected to the top of the air duct 5 by threads.

[0025] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7The top of the cabinet 1 is slidably connected with a pressure relief cylinder 8 between the two air ducts 5. The cylinder wall of the pressure relief cylinder 8 is provided with a plurality of through holes 9 distributed in a circular array. The upper outer part of the pressure relief cylinder 8 is fixedly connected with a rain shield 10, and the rain shield 10 is made of stainless steel. The setting of the rain shield 10 can prevent rainwater from entering the pressure relief cylinder 8 through the through hole 9. The top of the pressure relief cylinder 8 is threadedly connected with a disassembly cover 11, and the inner side of the pressure relief cylinder 8 is slidably connected with a sleeve 12. The inner wall of the sleeve 12 is fixedly connected with a plurality of fixed rods 13, and a support block 14 is fixedly connected between the plurality of fixed rods 13. The upper end of the support block 14 and the bottom of the disassembly cover 11 are fixedly connected with a rubber plug 15, and a kerosene glass tube 16 is inserted between the rubber plugs 15. The lower outer part of the pressure relief cylinder 8 is fixedly connected with a retaining ring 20, and a sealing ring 21 is embedded in the bottom of the retaining ring 20, and the retaining ring 20 and the sealing ring 21 are both in contact with the cabinet 1. The arrangement of the retaining ring 20 and the sealing ring 21 provides a sealing effect on the joint between the pressure relief cylinder 8 and the cabinet 1. The upper end of the support block 14 and both sides of the kerosene glass tube 16 are fixedly connected with guide sleeves 17, and the inner side of each guide sleeve 17 is slidably connected with a guide rod 18, and the top of the guide rod 18 is fixedly connected to the disassembly cover 11. A spring 19 is arranged on the inner side of the guide sleeve 17, and one end of the spring 19 is fixedly connected to the guide rod 18, and the other end of the spring 19 is fixedly connected to the inner surface of the guide sleeve 17. Through the arrangement of the spring 19, the tension can be applied to the envelope 12.

[0026] See also Figure 4 , Figure 6 , the top of the inner side of the cabinet 1 and both sides of the pressure relief cylinder 8 are fixedly connected with a fixing sleeve 22, the inner side of the fixing sleeve 22 is slidably connected with a latch 23, one end of the latch 23 is plugged with the pressure relief cylinder 8, the other end of the latch 23 is fixedly connected with a spring 24, the end of the spring 24 away from the latch 23 is fixedly connected to the inner surface of the fixing sleeve 22, and the pin body of the latch 23 is fixedly connected with a lever 25, which penetrates the fixing sleeve 22 and is slidably connected with the fixing sleeve 22. The latch 23 is pulled horizontally by the lever 25, the latch 23 slides in the fixing sleeve 22, and the spring 24 is compressed, and then the state of the latch 23 is maintained, and the pressure relief cylinder 8 is inserted from the top of the cabinet 1 until the retaining ring 20 contacts the cabinet 1, and then the lever 25 is released, the latch 23 is reset under the action of the spring 24, and inserted into the side wall of the pressure relief cylinder 8, so that the installation of the pressure relief cylinder 8 is completed.

[0027] The specific implementation process of the utility model is as follows: when in use, first pull the latch 23 horizontally through the lever 25, the latch 23 slides in the fixing sleeve 22, and compresses the spring 24, then keep the state of the latch 23, and insert the pressure relief cylinder 8 from the top of the cabinet 1 until the retaining ring 20 hits the cabinet 1, then release the lever 25, the latch 23 is reset under the action of the spring 24, and inserted into the side wall of the pressure relief cylinder 8, so that the installation of the pressure relief cylinder 8 is completed;

[0028] When the switch cabinet is in normal use, the exhaust fan 6 normally dissipates heat in the cabinet body 1. When the electric arc combustion in the cabinet body 1 releases huge energy in a short time, causing the gas inside the cabinet body 1 to expand and the pressure to increase suddenly, the kerosene glass tube 16 will be broken, thereby releasing the restriction on the envelope 12. The envelope 12 rises under the pulling force of the spring 19 and exposes the through hole 9. In this way, the air pressure in the cabinet body 1 can be discharged through the through hole 9, thereby achieving the purpose of internal pressure relief of the switch cabinet.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high and low voltage switch cabinet pressure relief structure, comprising a cabinet body (1), characterized in that: The front of the cabinet (1) is hinged with a sealed door (2); the top of the cabinet (1) is fixedly connected to two symmetrically distributed air ducts (5), and an exhaust fan (6) is installed on the inner side of each air duct (5); the top of the air duct (5) is connected to a mesh cover (7) by means of a thread; the top of the cabinet (1) is slidably connected to a pressure relief cylinder (8) located between the two air ducts (5); the cylinder wall of the pressure relief cylinder (8) is provided with a plurality of through holes (9) distributed in an annular array; The top of the pressure relief cylinder (8) is connected to a detachable cover (11) via a thread, the inner side of the pressure relief cylinder (8) is slidably connected to a sleeve (12), the inner wall of the sleeve (12) is fixedly connected to a plurality of fixing rods (13), and a support block (14) is fixedly connected between the plurality of fixing rods (13), the upper end of the support block (14) and the bottom of the detachable cover (11) are fixedly connected to a rubber plug (15), and a kerosene glass tube (16) is inserted between the rubber plugs (15).

2. A high and low voltage switch cabinet pressure relief structure according to claim 1, characterized in that: The left and right side walls of the cabinet (1) are both provided with heat dissipation holes (3), and the inner wall of the cabinet (1) is fixedly connected with a partition net (4).

3. A high and low voltage switch cabinet pressure relief structure according to claim 1, characterized in that: A rain shield plate (10) is fixedly connected to the upper outer portion of the pressure relief cylinder (8), and the rain shield plate (10) is made of stainless steel.

4. A high and low voltage switch cabinet pressure relief structure according to claim 1, characterized in that: A retaining ring (20) is fixedly connected to the lower outer portion of the pressure relief cylinder (8), a sealing ring (21) is embedded in the bottom of the retaining ring (20), and both the retaining ring (20) and the sealing ring (21) are in contact with the cabinet body (1).

5. The high and low voltage switch cabinet pressure relief structure according to claim 1 is characterized in that: A guide sleeve (17) is fixedly connected to the upper end of the support block (14) and located on both sides of the kerosene glass tube (16); a guide rod (18) is slidably connected to the inner side of each guide sleeve (17); the top of the guide rod (18) is fixedly connected to the removal cover (11); a spring (19) is arranged on the inner side of the guide sleeve (17); one end of the spring (19) is fixedly connected to the guide rod (18); and the other end of the spring (19) is fixedly connected to the inner surface of the guide sleeve (17).

6. A high and low voltage switch cabinet pressure relief structure according to claim 1, characterized in that: A fixing sleeve (22) is fixedly connected to the top of the inner side of the cabinet (1) and located on both sides of the pressure relief cylinder (8); a latch (23) is slidably connected to the inner side of the fixing sleeve (22); one end of the latch (23) is plugged into the pressure relief cylinder (8); the other end of the latch (23) is fixedly connected to a spring 2 (24); one end of the spring 2 (24) away from the latch (23) is fixedly connected to the inner surface of the fixing sleeve (22); a lever (25) is fixedly connected to the end of the pin body of the latch (23); the lever (25) passes through the fixing sleeve (22) and is slidably connected to the fixing sleeve (22).

Images