A safety relief device

Abstract

The application discloses a safe pressure relief device of a ring net cabinet, and is characterized in that the device comprises a support ring structure, a reinforcing rib is arranged in the support ring, a sealing ring is arranged outside the support ring structure, a diaphragm is arranged between the support ring structure and a pressing plate, a limiting groove is arranged at a position where the pressing plate and the diaphragm edge contact, the pressing plate is fixed at a gas tank welding stud through cooperation of a fastener and a buffer assembly, a safety baffle is arranged at the other end of the pressing plate, and a pressure relief gap is arranged at the mounting baffle. Compared with the prior art, the support ring and the pressing plate are integrally formed by using a mold, and the device has a cost advantage. Meanwhile, the structure of the device can effectively meet the safe protection requirement of the ring net cabinet.

Description

Technical Field

[0001] This invention relates to the field of medium-voltage power distribution switchgear, and more specifically to a safety pressure relief device. Background Technology

[0002] Existing pressure relief devices for ring main units generally suffer from two major shortcomings: first, directly purchasing existing pressure relief devices from the market results in sealing structures lacking precise pressure control design, leading to significant deviations in burst pressure values; second, the high-pressure airflow lacks guidance and restraint during pressure relief, especially during inflation operations, where the pressure burst could be directed towards operators, posing a safety hazard. Furthermore, many similar pressure relief components on the market use custom-made non-standard parts, resulting in high unit procurement costs, low product cost-effectiveness, and cumbersome assembly. These issues fail to address the triple pain points of pressure control accuracy, personal safety, and production costs. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of this invention is to provide a safety pressure relief device for ring main units.

[0004] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0005] A safety pressure relief device for a ring main unit includes:

[0006] A support ring structure, wherein the support ring structure is provided with reinforcing ribs;

[0007] A sealing ring is provided on the outer side of the support ring structure;

[0008] A diaphragm is provided between the support ring structure and the pressure plate;

[0009] A limit groove is provided at the position where the pressure plate contacts the edge of the diaphragm;

[0010] The pressure plate is fixed to the gas box welding stud by fasteners and buffer components.

[0011] A safety baffle is provided at the other end of the pressure plate, and a pressure relief notch is provided at the installation location of the baffle.

[0012] In a preferred embodiment of the present invention, the support ring structure and the reinforcing rib are integrally molded from a plastic material. The plastic material is preferably plastic.

[0013] In a preferred embodiment of the present invention, the reinforcing rib is a cross-shaped reinforcing rib.

[0014] In a preferred embodiment of the present invention, the compression of the sealing ring is 20%-25%.

[0015] In a preferred embodiment of the present invention, the fasteners are six first fasteners disposed in the fastener mounting holes of the pressure plate, and the buffer components are six first buffer components that cooperate with the six first fasteners.

[0016] In a preferred embodiment of the present invention, the buffer assembly is an elastic pad and a flat pad.

[0017] In a preferred embodiment of the present invention, a safety baffle mounting hole is provided at the other end of the pressure plate, and a safety baffle is installed through the safety baffle mounting hole in conjunction with the second fastener and the second buffer assembly.

[0018] In a preferred embodiment of the present invention, the radial surface of the safety baffle is provided with a concave surface that matches the shape of the fastener.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention uses a sealing ring with 20%-25% compression, which significantly reduces the burst pressure deviation, stabilizes the pressure relief trigger pressure, and reliably matches the safety protection requirements of the ring main unit.

[0021] This invention employs a safety baffle to guide and depressurize the airflow, structurally avoiding the risk of injury from airflow during malfunctions and depressurization.

[0022] Compared with existing technologies, the support ring and pressure plate of this invention are molded into an integrated mold, and standardized sealing rings, diaphragms and fasteners are selected. The cost of a single unit of the whole device is controlled within 30 yuan, which is about 50% lower than the cost of mainstream similar products on the market, and significantly reduces the material cost of the ring main unit.

[0023] The present invention has good structural dimensional consistency, standardized assembly process, and convenient disassembly and assembly. It can be fully matched with the company's various series of gas-insulated cabinet products, and achieve cost reduction and efficiency improvement on a large scale. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a schematic diagram of the pressure plate structure of the present invention.

[0026] Figure 3 This is a schematic diagram of the safety baffle structure of the present invention.

[0027] Figure 4 This is a schematic diagram of the support ring structure of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, in the following descriptions, well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of the invention.

[0029] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] like Figure 1-4 The safety pressure relief device for a ring main unit shown includes a support ring structure 3, within which a reinforcing rib 31 is provided. In this embodiment, the reinforcing rib 31 is a cross-shaped reinforcing rib. The support ring structure 3 and the reinforcing rib 31 are integrally molded from a plastic material. In this embodiment, the plastic material is selected as plastic.

[0031] A sealing ring 2 is provided on the outside of the support ring structure 3, and the compression of the sealing ring 2 is 20%-25%. Through multiple pressure threshold tests, the inventors have locked the compression of the sealing ring in the optimal range of 20%-25%, thus achieving precise and controllable burst pressure.

[0032] A diaphragm 4 is provided between the support ring structure 3 and the pressure plate 5, and a limit groove 51 is provided at the position where the pressure plate 5 and the edge of the diaphragm 4 contact.

[0033] The pressure plate 5 is fixed to the gas box welding stud 1 by fasteners and buffer components. The fasteners are six first fasteners 7 installed in the fastener mounting holes of the pressure plate 5, and the buffer components are six first buffer components that cooperate with the six first fasteners. The buffer components are elastic washers 9 and flat washers 8. In this embodiment of the invention, the fastener 7 is a nut.

[0034] A safety baffle 6 is provided at the other end of the pressure plate 5. Specifically, a safety baffle mounting hole 52 is provided at the other end of the pressure plate 5. The safety baffle is installed through the safety baffle mounting hole 52 in conjunction with the second fastener 10 and the second buffer assembly. The safety baffle 6 has a corresponding mounting hole 63. In this embodiment, the diameter of the mounting hole 63 is 7mm. The second fastener 10 in this embodiment is an M6*12 screw.

[0035] The second buffer assembly consists of a second elastic pad 12 and a second planar pad 11.

[0036] Pressure relief openings 61 and 62 are provided at 6 locations on the installed baffle.

[0037] The radial surface of the safety baffle 6 is provided with a concave surface 64 that matches the shape of the fastener 7. The pressure relief airflow can be directionally guided by adjusting the installation position of the safety baffle 6 to prevent high-pressure airflow from blowing directly on the operator.

[0038] Because of the above structure, the working principle of this invention is as follows:

[0039] The diaphragm 4 is installed in the limiting groove 51 of the pressure plate 5, and then the sealing ring 2 and the support ring 3 are placed on the diaphragm 4. The outer diameter of the support ring 3 fits with the inner ring of the sealing ring 2, so that the sealing ring 2 is positioned.

[0040] The entire assembly is then fixed to the gas box welding stud 1 and secured with 6 nuts 7 in conjunction with flat washers 8 and spring washers 9.

[0041] The sealing ring 2 can be a standardized specification with a wire diameter of 5mm. After installation, it protrudes about 1mm from the pressure plate, and the theoretically calculated compression amount is 20%, which is the optimal structure.

[0042] Then, by using the M6*12 screw 10 and the flat washer 11 and spring washer 12 to fasten the safety baffle 6 to the M6 ​​threaded hole 52 inside the pressure plate 5.

[0043] When the pressure is released, the diaphragm 4 ruptures, and the resulting airflow pushes the safety baffle 6. Due to the notches 61 and 62, the safety baffle 6 bends downward, and the airflow is guided.

[0044] The operator stands directly in front of the cabinet, and the airflow direction can be set to guide backward, thus avoiding the safety hazard of internal fault airflow blowing towards the operator.

[0045] Pressure is released when the pressure reaches 1.3 times the design pressure threshold. The pressure release channel is directed by a safety baffle fixed to the outside of the pressure plate, so that the pressure release direction is away from the personnel's location, thus maximizing personal safety.

[0046] The foregoing has shown and described the basic principles and main features of the invention and the advantages of the invention.

[0047] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A safety pressure relief device for a ring main unit, characterized in that, include: A support ring structure, wherein the support ring structure is provided with reinforcing ribs; A sealing ring is provided on the outer side of the support ring structure; A diaphragm is provided between the support ring structure and the pressure plate; A limit groove is provided at the position where the pressure plate contacts the edge of the diaphragm; The pressure plate is fixed to the gas box welding stud by fasteners and buffer components. A safety baffle is provided at the other end of the pressure plate, and a pressure relief notch is provided at the installation location of the baffle.

2. The safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The support ring structure and the reinforcing rib are integrally molded using plastic material.

3. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The reinforcing rib is a cross-shaped reinforcing rib.

4. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The compression of the sealing ring is 20%-25%.

5. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The fasteners are six first fasteners installed in the fastener mounting holes of the pressure plate, and the buffer components are six first buffer components that cooperate with the six first fasteners.

6. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The buffer assembly consists of an elastic pad and a flat pad.

7. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The other end of the pressure plate is provided with a safety baffle mounting hole, through which a safety baffle is installed in conjunction with a second fastener and a second buffer assembly.

8. A safety pressure relief device for a ring main unit as described in claim 1, characterized in that, The radial surface of the safety baffle is provided with a concave surface that matches the shape of the fastener.

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