Safety protection mechanism of ring main unit

Abstract

The utility model relates to the technical field of ring main units, in particular to a safety protection mechanism of a ring main unit, which comprises a cabinet top plate of the ring main unit, and further comprises a pressure relief cover arranged at a pressure relief position at the top of the cabinet top plate, a connecting piece is fixed at the top of the pressure relief cover, and one end of the connecting piece is rotatably mounted at the top of the cabinet top plate through a shaft seat; the sliding groove is formed in the connecting piece and communicated with the bottom of the pressure relief cover, a sliding strip is installed on the inner wall of the sliding groove in a sliding mode, a spring is connected between the outer wall, away from the shaft base, of the sliding strip and the inner wall of the sliding groove, an outer pressure relief hole is formed in the top of the connecting piece, and an inner pressure relief hole is formed in the sliding strip. According to the utility model, not only can air pressure in the cabinet be timely released when the air pressure does not exceed a dangerous value, but also the pressure release cover can be timely opened to release pressure when the air pressure exceeds the dangerous value, so that the ring main unit is prevented from being in a relatively high basic pressure environment, and the safety performance is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, in particular to a safety protection mechanism for a ring network cabinet. Background Art

[0002] Ring main unit is a kind of high voltage electrical equipment, usually installed in a metal or non-metallic insulating cabinet, or as an assembled interval ring main unit. Its core part is composed of load switches and fuses, and it has the advantages of simple structure, small size and low cost.

[0003] At present, the ring network cabinet usually needs to be provided with a pressure relief structure inside so that the high pressure generated in the event of a fault can be discharged from the ring network cabinet. For example, Chinese patent CN214280492U discloses a ring network cabinet bottom plate pressure relief structure. When the pressure inside the ring network cabinet exceeds a certain value, the thin plate is easily broken to discharge the gas to prevent explosion. After the pressure is released, only the pressure relief plate needs to be replaced.

[0004] Another example is Chinese patent CN220421261U, which discloses a pressure relief structure for a ring network cabinet. When the air pressure in the air chamber is too high, the pressure breaks the nylon bolt on one side of the pressure relief cover. At this time, the pressure relief cover presses the second fixing seat upward, and through the cooperation between the structures, the pressure relief cover is fully opened until the pressure relief cover and the cabinet top plate are at 90 degrees, and the pressure relief is completed.

[0005] Although the above two pressure relief structures can complete the pressure relief in the ring network cabinet, the pressure relief method is that the pressure relief structure will only start to relieve pressure when the internal pressure of the ring network cabinet exceeds a certain pressure (that is, the dangerous value). If the pressure inside the cabinet has not reached the dangerous level, it means that the pressure relief structure cannot be triggered, which will cause the inside of the ring network cabinet to remain at a higher pressure level. At this time, if a secondary fault occurs inside the cabinet within a short period of time, especially an arc explosion or other fault that can sharply increase the pressure inside the cabinet, then the pressure level in the cabinet will increase instantaneously on the basis of the higher pressure, thereby reaching a level far exceeding the dangerous value. At this time, the destructive force caused by the pressure relief structure when it starts to relieve pressure is greater, and even more serious equipment damage or safety accidents may be caused. Utility Model Content

[0006] The purpose of the utility model is to provide a safety protection mechanism for a ring main unit to solve at least one technical problem existing in the above-mentioned prior art.

[0007] To achieve the above object, the utility model provides the following technical solution: a safety protection mechanism of a ring network cabinet, including a cabinet top plate of the ring network cabinet, and also including:

[0008] A pressure relief cover is arranged at the pressure relief position on the top of the cabinet top plate, a connecting piece is fixed on the top of the pressure relief cover, and one end of the connecting piece is rotatably mounted on the top of the cabinet top plate through a shaft seat;

[0009] A sliding groove is provided inside the connecting piece and communicated with the bottom of the pressure relief cover, a sliding bar is slidably mounted on the inner wall of the sliding groove, a spring is connected between the outer wall of the sliding bar away from the shaft seat and the inner wall of the sliding groove, an external pressure relief hole is provided on the top of the connecting piece, and an internal pressure relief hole is provided inside the sliding bar;

[0010] A top block fixed on the top of the cabinet top plate, wherein a wedge hole is provided inside the top block, and a wedge block is connected to one end of the sliding bar away from the spring, and the wedge block can be inserted into the wedge hole;

[0011] The unlocking component drives the sliding bar to move away from the top block according to the pressure in the ring network cabinet.

[0012] Preferably, the unlocking assembly includes a built-in groove opened at the bottom of the pressure relief cover and connected to the sliding groove, the inner wall of the built-in groove is rotatably installed with a swing plate and a gear fixed to each other, the inner wall of the built-in groove is also fixed with a fixed plate, a fan-shaped airbag is installed between the fixed plate and the swing plate, and the side wall of the sliding bar is also fixed with a rack meshing with the gear.

[0013] Preferably, when the fan-shaped airbag is in the maximum expanded state, the air pressure in the fan-shaped airbag is lower than the air pressure in the ring main unit under normal pressure.

[0014] Preferably, the inner top of the wedge hole is set as an inclined surface, and the top of the wedge block is set as an inclined surface matching therewith.

[0015] Preferably, a ball is provided on the inclined surface at the top of the wedge block, and the ball is in rolling contact with the inclined surface at the top of the wedge hole.

[0016] Preferably, the contact surfaces of the wedge block and the wedge hole are both smooth surfaces, and a lubricant is applied between the two.

[0017] Preferably, when the connecting member maintains a horizontal state, the top block is embedded in the sliding groove and contacts and abuts against the inner wall of the sliding groove.

[0018] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0019] The utility model controls the moving distance of the driving sliding bar according to the pressure in the ring network cabinet through the unlocking component, so that the pressure relief mode in the cabinet can be switched between preventive pressure relief and conventional pressure relief. Not only can the air pressure in the cabinet be released in time when it does not exceed the dangerous value, but the pressure relief cover can be opened in time to release the pressure when the air pressure exceeds the dangerous value, thereby avoiding the ring network cabinet being in a high basic pressure environment, and further improving the safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 It is the front view of the utility model;

[0022] Figure 3 It is a front cross-sectional view of the utility model;

[0023] Figure 4 For this utility model Figure 3 Cutaway stereogram of perspective;

[0024] Figure 5 This is a state diagram of the pressure relief cover of the utility model in an open state;

[0025] Figure 6 It is a partial bottom view of the utility model.

[0026] In the figure: 1. cabinet top plate; 2. connecting piece; 3. pressure relief cover; 4. external pressure relief hole; 5. top block; 6. sliding groove; 7. sliding bar; 8. internal pressure relief hole; 9. wedge block; 10. wedge hole; 11. ball bearing; 12. spring; 13. built-in groove; 14. gear; 15. swing plate; 16. fixed plate; 17. fan-shaped air bag; 18. rack. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figures 1 to 6 The utility model provides a technical solution: a safety protection mechanism of a ring network cabinet, including a cabinet top plate 1 of the ring network cabinet, and also including:

[0029] A pressure relief cover 3 is arranged at the pressure relief position on the top of the cabinet top plate 1, a connecting piece 2 is fixed on the top of the pressure relief cover 3, and one end of the connecting piece 2 is rotatably mounted on the top of the cabinet top plate 1 through an axle seat;

[0030] A sliding groove 6 is provided inside the connecting member 2 and communicated with the bottom of the pressure relief cover 3. A sliding bar 7 is slidably mounted on the inner wall of the sliding groove 6. A spring 12 is connected between the outer wall of the sliding bar 7 away from the shaft seat and the inner wall of the sliding groove 6. An external pressure relief hole 4 is provided on the top of the connecting member 2. An internal pressure relief hole 8 is provided inside the sliding bar 7.

[0031] A top block 5 is fixed on the top of the cabinet top plate 1, a wedge hole 10 is opened inside the top block 5, and a wedge block 9 is connected to the end of the sliding bar 7 away from the spring 12, and the wedge block 9 can be inserted into the wedge hole 10;

[0032] The unlocking component drives the sliding bar 7 to move away from the top block 5 according to the pressure in the ring network cabinet, and the moving distance of the sliding bar 7 is set in direct proportion to the pressure in the cabinet.

[0033] See also Figure 3 In normal use, the sliding bar 7 is inserted into the wedge hole 10 under the elastic force of the spring 12, locking the connector 2, so that the pressure relief cover 3 is installed at the pressure relief position of the cabinet top plate 1;

[0034] Then, when pressure is generated in the ring network cabinet, for example, the pressure increases due to a minor fault, the unlocking component drives the sliding bar 7 to move away from the top block 5, and controls the sliding distance of the sliding bar 7 according to the pressure in the cabinet. When the sliding bar 7 moves, the internal pressure relief hole 8 on it and the external pressure relief hole 4 on the connecting piece 2 are connected to form a connected pressure relief channel to release the air pressure generated in the ring cabinet. In this stage, the wedge block 9 on the sliding bar 7 is not separated from the wedge hole 10, that is, the air pressure generated in the ring network cabinet does not exceed the dangerous value. Therefore, only the pressure relief channel is needed to relieve the pressure inside, and there is no need to open the pressure relief cover 3. Then, as the air pressure in the ring network cabinet gradually decreases, the unlocking component group drives the sliding bar 7 to move in the opposite direction, and the wedge block 9 is completely reinserted into the wedge hole 10. In this way, the ring network cabinet is preventively relieved through the pressure relief channel, so that the ring network cabinet can be kept in a relatively normal pressure environment.

[0035] When a fault occurs inside the cabinet, especially an arc explosion or other fault that can sharply increase the pressure inside the cabinet, the pressure level inside the cabinet will increase instantly. At this time, the unlocking component will control the movement of the sliding bar 7 to completely disengage the wedge block 9 from the wedge hole 10, so as to release the locking effect on the connector 2. At this time, the pressure relief cover 3 will be pushed open under the action of the internal high pressure, so that the high pressure inside the cabinet can be quickly and routinely relieved, thereby avoiding major damage to the equipment;

[0036] In this way, the unlocking component is used to control the moving distance of the driving sliding bar 7 according to the pressure in the ring network cabinet, so that the pressure relief mode in the cabinet can be switched between preventive pressure relief and conventional pressure relief. Not only can the air pressure in the cabinet be released in time when it does not exceed the dangerous value, but the pressure relief cover 3 can also be opened in time to release the pressure when the air pressure exceeds the dangerous value, thereby avoiding the ring network cabinet being in a higher basic pressure environment, thereby further improving the safety performance.

[0037] In one of the more preferred embodiments, the unlocking component includes a built-in groove 13 opened at the bottom of the pressure relief cover 3 and connected to the sliding groove 6, and the inner wall of the built-in groove 13 is rotatably installed with a swing plate 15 and a gear 14 fixed to each other. The inner wall of the built-in groove 13 is also fixed with a fixed plate 16, and a fan-shaped air bag 17 is installed between the fixed plate 16 and the swing plate 15, and the fan-shaped air bag 17 is a closed air bag, and the side wall of the sliding bar 7 is also fixed with a rack 18 meshing with the gear 14.

[0038] When the fan-shaped airbag 17 is in the maximum expanded state, the air pressure in the fan-shaped airbag 17 is lower than the air pressure in the ring main unit under normal pressure.

[0039] For details on unlocking components, see Figure 3 and Figure 6 , since the fan-shaped airbag 17 is a closed airbag, and when the wedge block 9 is in the wedge hole 10, the fan-shaped airbag 17 is in the maximum open state, and at this time the air pressure in the fan-shaped airbag 17 is lower than the air pressure in the ring network cabinet, so it will have a tendency to shrink, but due to the elastic force of the spring 12 on the sliding bar 7, the sliding bar 7 is in a stationary state;

[0040] When the air pressure in the ring main unit increases, the fan-shaped airbag 17 will shrink due to the pressure difference between the inside and outside of the fan-shaped airbag 17, thereby driving the swing plate 15 to rotate. Under the meshing action of the gear 14 and the rack 18, the sliding bar 7 will overcome the elastic force of the spring 12 and move, so that the wedge block 9 is pulled out of the wedge hole 10, so as to achieve the purpose of preventive pressure relief mentioned above;

[0041] On the contrary, when the pressure in the cabinet decreases, under the elastic force of the spring 12, the sliding bar 7 will return to its original position and the fan-shaped airbag 17 will open again.

[0042] Since the contraction degree of the fan-shaped airbag 17 is related to the air pressure in the cabinet, whether the wedge block 9 can be completely separated from the wedge hole 10 is also related to the air pressure in the cabinet. In this way, the switching of the two pressure relief modes can be automatically controlled by utilizing the air pressure in the cabinet, thereby achieving the above-mentioned different pressure relief modes;

[0043] It is worth noting that the initial air pressure in the fan-shaped airbag 17 and the labor-saving lever method in which the swing plate 15 drives the gear 14 to rotate are both designed to enable the sliding bar 7 to move when the air pressure in the cabinet changes slightly, so as to increase the sensitivity of the sliding bar 7 to changes in the air pressure in the cabinet, thereby ensuring that the cabinet can be maintained in a basic air pressure environment.

[0044] Moreover, after the pressure relief cover 3 is opened, the sliding bar 7 will reset again after the pressure difference between the inside and outside of the fan-shaped airbag 17 is reduced. In this way, when the pressure relief cover 3 hits and swings back, the blocking of the wedge block 9 by the top block 5 can also prevent the pressure relief cover 3 from automatically resetting and locking.

[0045] In one of the more preferred embodiments, the inner top of the wedge hole 10 is set as an inclined surface, and the top of the wedge block 9 is set as an inclined surface adapted thereto.

[0046] By setting the inclined surface, when the wedge block 9 disengages outward, its bottom surface can be separated from the inner wall of the wedge hole 10, which can not only reduce the friction between the wedge hole 10 and the wedge block 9, but also allow the connector 2 to have a displacement that can open outward at a certain angle. In this way, by setting a gap between the pressure relief cover 3 and the pressure relief position, during the preventive pressure relief process, a certain gap can be generated between the pressure relief cover 3 and the pressure relief position, thereby further ensuring the release of pressure in the cabinet.

[0047] In one of the more preferred embodiments, a ball 11 is provided on the inclined surface at the top of the wedge block 9 , and the ball 11 is in rolling contact with the inclined surface at the top of the wedge hole 10 .

[0048] The friction between the two can be further reduced by the ball bearing 11, so that the movement and adjustment of the sliding bar 7 are more sensitive.

[0049] In one of the more preferred embodiments, the contact surfaces of the wedge block 9 and the wedge hole 10 are both smooth surfaces, and a lubricant is applied between the two.

[0050] Similarly, the friction between the wedge block 9 and the wedge hole 10 can also be reduced by providing a smooth surface.

[0051] In one of the more preferred embodiments, when the connecting member 2 is kept in a horizontal state, the top block 5 is embedded in the sliding groove 6 and contacts and abuts against the inner wall of the sliding groove 6 .

[0052] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0053] 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 safety protection mechanism for a ring main unit, comprising a top plate (1) of the ring main unit, characterized in that: Also includes: A pressure relief cover (3) is arranged at a pressure relief position on the top of the cabinet top plate (1), a connecting piece (2) is fixed to the top of the pressure relief cover (3), and one end of the connecting piece (2) is rotatably mounted on the top of the cabinet top plate (1) via a shaft seat; A sliding groove (6) is provided inside the connecting member (2) and is connected to the bottom of the pressure relief cover (3); a sliding bar (7) is slidably mounted on the inner wall of the sliding groove (6); a spring (12) is connected between the outer wall of the sliding bar (7) away from the shaft seat and the inner wall of the sliding groove (6); an external pressure relief hole (4) is provided on the top of the connecting member (2); and an internal pressure relief hole (8) is provided inside the sliding bar (7); A top block (5) fixed on the top of the cabinet top plate (1), a wedge hole (10) is provided inside the top block (5), a wedge block (9) is connected to the end of the sliding bar (7) away from the spring (12), and the wedge block (9) can be inserted into the wedge hole (10); The unlocking component drives the sliding bar (7) to move away from the top block (5) according to the pressure in the ring network cabinet.

2. The safety protection mechanism of the ring main unit according to claim 1 is characterized in that: The unlocking assembly comprises a built-in groove (13) which is opened at the bottom of the pressure relief cover (3) and communicates with the sliding groove (6); a swing plate (15) and a gear (14) which are fixed to each other are rotatably mounted on the inner wall of the built-in groove (13); a fixed plate (16) is also fixed to the inner wall of the built-in groove (13); a fan-shaped air bag (17) is installed between the fixed plate (16) and the swing plate (15); and a rack (18) which meshes with the gear (14) is also fixed to the side wall of the sliding bar (7).

3. The safety protection mechanism of the ring main unit according to claim 2 is characterized in that: When the fan-shaped airbag (17) is in the maximum expanded state, the air pressure in the fan-shaped airbag (17) is lower than the air pressure in the ring main cabinet under normal pressure.

4. The safety protection mechanism of the ring main unit according to claim 1 is characterized in that: The inner top of the wedge hole (10) is configured as an inclined surface, and the top of the wedge block (9) is configured as an inclined surface matching the inclined surface.

5. The safety protection mechanism of the ring main unit according to claim 4 is characterized in that: A ball (11) is provided on the inclined surface at the top of the wedge block (9), and the ball (11) is in rolling contact with the inclined surface at the top of the wedge hole (10).

6. The safety protection mechanism of the ring main unit according to claim 4 is characterized in that: The contact surfaces of the wedge block (9) and the wedge hole (10) are both smooth surfaces, and a lubricant is applied between the two.

7. The safety protection mechanism of the ring main unit according to any one of claims 1 to 6, characterized in that: When the connecting member (2) is kept in a horizontal state, the top block (5) is embedded in the sliding groove (6) and contacts and abuts against the inner wall of the sliding groove (6).

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