A closed ring main switchgear

Abstract

The utility model provides a kind of closed ring main unit, including mechanism box, gas tank and cable chamber, the mechanism box is arranged at the front of gas tank, the cable chamber includes left door, right door, sealing door, sealing bottom plate and rear sealing plate, left door, right door, sealing door, sealing bottom plate, rear sealing plate and the bottom of gas tank jointly form cable chamber, form a sealed compartment;The rear of the cable chamber is also provided with pressure relief chamber, the sidewall of the pressure relief chamber is equipped with access hole, the access hole is equipped with pressure relief device, the pressure relief device is used for the arc of ring main unit inside occurs, the pressure relief effect of gas, by cable chamber is designed as by left door, right door, sealing door, sealing bottom plate, rear sealing plate and gas tank bottom jointly formed sealed compartment, effectively prevent external dust, moisture etc. Into cable chamber, protect cable and other equipment from the influence of external environment, improve the service life and operating stability of equipment.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, and in particular to a closed ring main unit. Background Technology

[0002] A ring main unit is an electrical device that houses a set of power transmission and distribution equipment in a metal or non-metal insulated cabinet or is assembled into a modular ring main unit. Its core components are load switches and fuses. It has the advantages of simple structure, small size, low price, improved power supply parameters and performance, and enhanced power supply safety.

[0003] In existing enclosed ring main units, the cable compartment is usually poorly designed and has poor sealing, making it susceptible to external environmental influences. This can lead to unstable operation of cables and other equipment, reducing their service life. In addition, when a fault such as arcing occurs inside the ring main unit, the internal pressure will rise sharply. If the pressure cannot be released in a timely and effective manner, it may cause more serious safety accidents and threaten the safety of equipment and personnel.

[0004] To address these issues, a closed-loop ring main unit is proposed. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve the problems of poor sealing of the cable compartment and untimely and unreliable pressure relief when there is a fault in the ring main unit, this utility model provides a closed ring main unit.

[0006] This utility model is achieved using the following technical solution:

[0007] A closed ring main unit includes a mechanism box, an air box, and a cable compartment. The mechanism box is located on the front of the air box, and the cable compartment is located below the mechanism box. The cable compartment includes a left door panel, a right door panel, a sealing door panel, a sealing bottom plate, and a rear sealing plate. The left door panel, right door panel, sealing door panel, sealing bottom plate, rear sealing plate, and the bottom of the air box together form the cable compartment, creating a sealed compartment.

[0008] A pressure relief chamber is also provided behind the cable compartment. An inspection port is provided on the side wall of the pressure relief chamber, and a pressure relief device is provided at the inspection port. The pressure relief device is used to relieve the pressure of gas when an arc occurs inside the ring main unit.

[0009] The pressure relief device includes a valve body, which is hollow inside and has a pressure plate and a bottom cover on the left and right sides respectively. A spring is provided between the pressure plate and the bottom cover. The bottom cover is fixedly connected to the valve body. One end of the spring is connected to the bottom cover and the other end is connected to the pressure plate. The pressure plate can move inside the valve body.

[0010] The valve body has multiple pressure relief holes on its outer peripheral wall, and the pressure relief holes are arranged around the circumference of the valve body axis.

[0011] The valve body is provided with multiple sets of pressure relief holes, and each set of pressure relief holes has multiple holes arranged around the circumference of the valve body axis.

[0012] Multiple sets of pressure relief holes are arranged in ascending order of diameter, at equal intervals.

[0013] The pressure plate has a guide post on its side wall, the spring is sleeved on the guide post, and a sealing ring is installed on the outer peripheral wall of the guide post.

[0014] The outer peripheral wall of the bottom cover is provided with a protruding ring, which is integrated with the bottom cover. The bottom cover is engaged with the valve body through the protruding ring.

[0015] The bottom cover has a placement groove on its side wall, and one end of the spring is placed in the placement groove.

[0016] The present invention has the following advantages over the prior art:

[0017] 1. By designing the cable compartment as a sealed compartment consisting of a left door panel, a right door panel, a sealed door panel, a sealed bottom plate, a rear sealing plate, and the bottom of the air box, external dust and moisture can be effectively prevented from entering the cable compartment, protecting cables and other equipment from the influence of the external environment, and improving the service life and operational stability of the equipment.

[0018] 2. A pressure relief chamber is installed behind the cable compartment, and a pressure relief device is installed at the maintenance port. When a fault such as arcing occurs inside the ring main unit, the pressure relief device can promptly relieve the gas pressure, preventing more serious safety accidents caused by excessive pressure and ensuring the safety of equipment and personnel. Furthermore, the valve body of the pressure relief device has multiple sets of pressure relief holes arranged in ascending order of diameter, which can automatically adjust the number and size of the opening holes according to the internal pressure, achieving more effective pressure relief control and improving the stability and reliability of pressure relief. Attached Figure Description

[0019] Figure 1 This is a front view of the utility model;

[0020] Figure 2 This is the right view of this utility model;

[0021] Figure 3 This is the left view of this utility model;

[0022] Figure 4 This is a three-dimensional structural schematic diagram of the pressure relief device of this utility model;

[0023] Figure 5 This is an exploded three-dimensional structural diagram of the pressure relief device of this utility model;

[0024] Figure 6 This is a front view of the pressure relief device of this utility model;

[0025] Figure 7 This is a utility model Figure 6 Schematic diagram of the cross-sectional structure along the AA direction;

[0026] In the diagram: 1. Mechanism box; 2. Air box; 3. Cable compartment; 31. Sealing door panel; 32. Sealing bottom plate; 33. Rear sealing plate; 4. Pressure relief chamber; 41. Inspection door; 5. Valve body; 51. Pressure relief hole; 52. Pressure plate; 53. Guide column; 54. Bottom cover; 541. Raised ring; 542. Placement groove; 6. Sealing ring; 7. Spring. Detailed Implementation

[0027] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 1 to 7 As shown, a closed ring main unit includes a mechanism box 1, an air box 2, and a cable compartment 3. The mechanism box 1 is located on the front of the air box 2, and the cable compartment 3 is located below the mechanism box 1. The cable compartment 3 includes a left door panel, a right door panel, a sealing door panel 31, a sealing bottom plate 32, and a rear sealing plate 33. The left door panel, right door panel, sealing door panel 31, sealing bottom plate 32, rear sealing plate 33, and the bottom of the air box 2 together form the cable compartment 3, creating a sealed compartment. Reinforcing angle steel is added at the junction of the air box 2 and the cable compartment 3. The reinforcing angle steel strengthens the cabinet and seals the gap between the air box 2 and the cabinet, forming the first layer of sealing reinforcement protection. The left and right door panels are bent and inserted into the reinforcing ribs of the air box 2 to form the second layer of sealing reinforcement protection. This sealing structure can effectively prevent external dust, moisture, etc. from entering the cable compartment 3, protecting cables and other equipment from the influence of the external environment, and improving the service life and operational stability of the equipment.

[0030] A pressure relief chamber 4 is also provided behind the cable compartment 3. An inspection port is provided on the side wall of the pressure relief chamber 4, and a pressure relief device is installed at the inspection port. This pressure relief device is used to relieve gas pressure when an arc occurs inside the ring main unit. When an arc or other fault occurs inside the ring main unit, the internal pressure rises sharply. The pressure relief device can promptly relieve the gas pressure, preventing more serious safety accidents caused by excessive pressure and ensuring the safety of equipment and personnel.

[0031] The pressure relief device includes a valve body 5, which is hollow inside and has a pressure plate 52 and a bottom cover 54 on its left and right sides, respectively. A spring 7 is installed between the pressure plate 52 and the bottom cover 54. The bottom cover 54 is fixedly connected to the valve body 5. One end of the spring 7 is connected to the bottom cover 54, and the other end is connected to the pressure plate 52. The pressure plate 52 can move inside the valve body 5. Under normal conditions, the spring 7 is in a certain compressed state, so that the pressure plate 52 is tightly fitted against the inner wall of the valve body 5, maintaining the sealing of the pressure relief device. When the internal pressure of the ring main unit rises to a certain level, the pressure acts on the pressure plate 52, overcoming the elastic force of the spring 7, causing the pressure plate 52 to move inside the valve body 5, thereby opening the pressure relief channel and realizing pressure relief.

[0032] The valve body 5 has multiple pressure relief holes 51 on its outer peripheral wall, which are arranged circumferentially along the axis of the valve body 5. This arrangement allows gas to be discharged evenly from each pressure relief hole 51, avoiding excessive local pressure and improving the stability and reliability of pressure relief.

[0033] The valve body 5 is provided with multiple sets of pressure relief holes 51, and each set of pressure relief holes 51 is provided with multiple holes and arranged around the circumference of the valve body 5 axis.

[0034] Multiple sets of pressure relief holes 51 are arranged in ascending order of diameter, evenly spaced. As the internal pressure of the ring main unit gradually increases, the pressure first overcomes the smaller spring force 7, causing the pressure plate 52 to move a certain distance and open the smaller set of pressure relief holes 51 for initial pressure relief. As the pressure continues to rise, the pressure plate 52 moves further, opening the larger set of pressure relief holes 51 to increase the pressure relief. This staged pressure relief design can automatically adjust the number and size of the pressure relief holes 51 according to the internal pressure, achieving more effective pressure relief control.

[0035] The pressure plate 52 has a guide post 53 on its side wall, and the spring 7 is sleeved on the guide post 53. A sealing ring 6 is installed on the outer peripheral wall of the guide post 53. The guide post 53 guides the extension and retraction of the spring 7, ensuring that the spring 7 does not deviate during compression and extension, thus improving the working stability of the pressure relief device. The sealing ring 6 enhances the sealing between the pressure plate 52 and the inner wall of the valve body 5, preventing gas leakage under normal conditions.

[0036] The outer peripheral wall of the bottom cover 54 is provided with a protruding ring 541, which is integrated with the bottom cover 54. The bottom cover 54 is engaged inside the valve body 5 by the protruding ring 541. This engaging connection method is simple and reliable, easy to install and disassemble, and can also ensure the connection stability between the bottom cover 54 and the valve body 5.

[0037] The bottom cover 54 has a placement groove 542 on its side wall. One end of the spring 7 is placed in the placement groove 542. The placement groove 542 can position the spring 7 to prevent it from shifting during compression and extension, and ensure the stability of the connection between the spring 7 and the pressure plate 52 and the bottom cover 54.

[0038] The working principle of this utility model is as follows: When in use, under normal conditions, the pressure plate 52 of the pressure relief device is tightly attached to the inner wall of the valve body 5 under the action of the spring 7, and the sealing ring 6 plays a sealing role to prevent gas leakage. At this time, the cable chamber 3 is in a sealed state, protecting the internal cables and other equipment.

[0039] When a fault such as arcing occurs inside the ring main unit, the internal pressure rises sharply. The pressure acts on the pressure plate 52, overcoming the elastic force of the spring 7, causing the pressure plate 52 to move along the guide column 53 inside the valve body 5. As the pressure rises, the pressure plate 52 first moves a certain distance and opens the group of pressure relief holes 51 with a smaller diameter for initial pressure relief.

[0040] As the pressure continues to rise, the pressure plate 52 moves further, opening the larger diameter pressure relief hole 51 group to increase the pressure relief amount, thereby achieving staged pressure relief. When the internal pressure drops to a certain level, the elastic force of the spring 7 causes the pressure plate 52 to reset, re-fit tightly against the inner wall of the valve body 5, close the pressure relief channel, and restore the sealing state.

[0041] Maintenance personnel can inspect and maintain the pressure relief device through the inspection port of pressure relief chamber 4 to ensure its normal operation.

[0042] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A closed ring main unit, comprising a mechanism box (1), an air box (2), and a cable compartment (3), wherein the mechanism box (1) is disposed on the front of the air box (2), and the cable compartment (3) is disposed below the mechanism box (1), characterized in that, The cable compartment (3) includes a left door panel, a right door panel, a sealing door panel (31), a sealing bottom plate (32), and a rear sealing plate (33). The left door panel, the right door panel, the sealing door panel (31), the sealing bottom plate (32), the rear sealing plate (33), and the bottom of the air box (2) together form the cable compartment (3), forming a sealed compartment. A pressure relief chamber (4) is provided behind the cable compartment (3). An inspection port is provided on the side wall of the pressure relief chamber (4). A pressure relief device is provided at the inspection port. The pressure relief device is used to relieve the pressure of gas when an arc occurs inside the ring main unit.

2. The enclosed ring main unit according to claim 1, characterized in that: The pressure relief device includes a valve body (5), which is hollow inside and has a pressure plate (52) and a bottom cover (54) on the left and right sides respectively. A spring (7) is provided between the pressure plate (52) and the bottom cover (54). The bottom cover (54) is fixedly connected to the valve body (5). One end of the spring (7) is connected to the bottom cover (54) and the other end is connected to the pressure plate (52). The pressure plate (52) can move inside the valve body (5). The valve body (5) has multiple pressure relief holes (51) on its outer peripheral wall, and the pressure relief holes (51) are arranged around the circumference of the valve body (5).

3. A closed-loop ring main unit according to claim 2, characterized in that: The valve body (5) is provided with multiple sets of pressure relief holes (51), and each set of pressure relief holes (51) is provided with multiple holes and arranged around the circumference of the valve body (5). The diameters of the multiple pressure relief holes (51) increase from small to large, and they are arranged evenly and at equal intervals.

4. A closed-loop ring main unit according to claim 3, characterized in that: The pressure plate (52) has a guide post (53) on its side wall, the spring (7) is sleeved on the guide post (53), and a sealing ring (6) is installed on the outer peripheral wall of the guide post (53).

5. A closed-loop ring main unit according to claim 3, characterized in that: The bottom cover (54) has a protruding ring (541) on its outer peripheral wall. The protruding ring (541) is integrated with the bottom cover (54). The bottom cover (54) is engaged with the valve body (5) through the protruding ring (541). The bottom cover (54) has a placement groove (542) on its side wall, and one end of the spring (7) is placed in the placement groove (542).

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