Pressure relief valve with self-adapting opening and closing cover

Abstract

The present application relates to a kind of pressure release valve with adaptive opening and closing cover, it includes valve body and cover;Wherein, the valve body includes base, top cover, column, valve disc and elastic piece, the top cover is located above base, top cover is connected between base by multiple columns, the middle part of base is equipped with discharge port, the valve disc cover is equipped on discharge port, the elastic piece is equipped between top cover and valve disc, and the elastic force of elastic piece is tightly pressed in discharge port on valve disc;The cover is covered in the outside of valve body, at least one group of openings is opened in cover sidewall, each group of openings includes two symmetrically arranged openings, and each opening is respectively equipped with the flap that can be automatically closed.The present application sets up full-closed cover, can better protect valve body spare parts;When pressure relief, the flap on cover can be automatically opened to increase discharge area and reduce flow resistance;Symmetrically arranged opening on cover can effectively balance valve disc force when pressure relief, avoid that valve disc occurs bias overturn.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and more specifically, to a pressure relief valve with an adaptive opening and closing housing. Background Technology

[0002] Due to changes in the physicochemical properties of insulating oil during long-term operation, low-resistance faults inevitably occur in high-voltage transformers and tap changers, resulting in arc discharge. The energy released by arc faults in high-voltage power grid equipment is enormous, vaporizing and cracking the insulating oil, instantly generating a large amount of high-temperature, high-pressure oil gas, which can then trigger pressure surges. Because the oil chamber of a transformer or tap changer has a limited volume, the accumulation of oil gas can cause overpressure, leading to damage to power equipment and structures. Oil chamber rupture further allows the high-temperature, high-pressure oil gas to leak out and come into contact with air, posing a fire and explosion hazard, seriously threatening personnel and equipment safety and polluting the environment. To solve these problems, one or more pressure relief valves are installed on the oil chamber of transformers or tap changers. When the oil chamber pressure rises, the pressure relief valve opens, releasing the high-temperature, high-pressure oil gas to the atmosphere to release the internal pressure of the oil chamber, protecting components and preventing combustion and explosion. After the pressure relief is completed, the pressure relief valve closes to isolate residual oil gas in the oil chamber and prevent secondary fire and explosion hazards.

[0003] However, existing pressure relief valves have small outlet areas and insufficient relief capacity, failing to promptly release high-temperature, high-pressure oil and gas. This results in overpressure even after the valve is in use, potentially damaging oil-immersed electrical equipment or even causing serious disasters. Most existing pressure relief valves employ a single-outlet design, leading to uneven force on the valve disc. This causes offset and overturning during the opening and closing process, resulting in inaccurate alignment and closure of the oil chamber, and unreliable sealing. Furthermore, critical internal components of existing pressure relief valves are exposed to the external environment, failing to protect against wind, sand, snow, and rain, and also unable to prevent the entry of birds and insects, easily leading to corrosion of valve body components. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a pressure relief valve with an adaptive opening and closing housing, which aims to solve the problems existing in the prior art.

[0005] According to the present invention, a pressure relief valve with an adaptive opening and closing housing is provided, comprising a valve body and a housing; wherein,

[0006] The valve body includes a base, a top cover, columns, a valve disc, and an elastic element. The top cover is located above the base, and the top cover and the base are connected by a plurality of columns. A vent is provided in the middle of the base, and the valve disc is placed on the vent of the base. The elastic element is located between the top cover and the valve disc, and the elastic force of the elastic element presses the valve disc tightly against the vent of the base.

[0007] The cover is installed outside the valve body. At least one set of openings is provided on the side wall of the cover. Each set of openings includes two symmetrically arranged openings. Each opening is provided with a flap that can be automatically closed.

[0008] Preferably, the elastic element is a helical compression spring, with its two ends abutting against the top cover and the valve disc, respectively.

[0009] Preferably, the valve body further includes a signal rod, the lower end of which abuts against the valve disc, and the upper end of which passes through the top cover and the housing and extends to the outside of the housing;

[0010] The signal pole is provided with a first annular groove, which is located at the upper end of the signal pole;

[0011] The top cover is provided with a flexible movable push rod and a micro switch. The first end of the flexible movable push rod abuts in the first annular groove of the signal rod, and the second end of the flexible movable push rod is connected to the micro switch.

[0012] When the valve disc pushes the signal rod upward, the first end of the elastic movable push rod slides out of the first annular groove, and the elastic movable push rod moves laterally to compress the micro switch, thereby causing the micro switch to emit an electronic signal.

[0013] Preferably, the signal pole is further provided with a second annular groove, and the second annular groove is set at a preset distance from the first annular groove;

[0014] When the signal rod moves downwards under its own weight, the first end of the elastic movable push rod can slide into the second annular groove, thereby preventing the signal rod from continuing to move downwards.

[0015] Preferably, the cover includes a cylindrical body and a cylindrical cover, the cylindrical cover is sealed on the top of the cylindrical body, the cross-section of the cylindrical body is a regular polygon with an even number of sides, and each set of openings is opened on two parallel side walls of the cylindrical body.

[0016] Preferably, the flap is rotatably connected to the opening via a rotating shaft.

[0017] Preferably, the pivot is located at the upper edge of the opening.

[0018] Preferably, the rotating shaft is provided with a torsion spring.

[0019] Preferably, both the edge of the vent and the edge of the opening are provided with sealing elements.

[0020] Preferably, the cover and the flap are made of stainless steel, aluminum alloy or polymer material.

[0021] The present invention has the following beneficial effects:

[0022] The pressure relief valve with an adaptive opening and closing cover provided by the present invention has a fully closed cover covering the valve body, which can better protect the valve body components. When the oil chamber pressure rises, the valve disc opens to release pressure. During pressure release, the flap on the cover automatically opens to increase the release area and reduce the flow resistance, thereby enhancing the overall pressure relief capacity of the pressure relief valve. The openings on the cover are symmetrically arranged, which can effectively balance the force of the valve disc during pressure release and prevent the valve disc from being offset and overturned during movement, thereby achieving reliable sealing of the oil chamber. Attached Figure Description

[0023] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings.

[0024] Figure 1 A schematic diagram of a pressure relief valve with an adaptive opening and closing housing according to an embodiment of the present invention is shown.

[0025] Figure 2 A schematic diagram of a pressure relief valve with an adaptive opening and closing housing according to an embodiment of the present invention is shown in its initial state.

[0026] Figure 3 A schematic diagram of a pressure relief valve with an adaptive opening and closing housing according to an embodiment of the present invention is shown in the pressure relief state.

[0027] Figure 4 A schematic diagram of a pressure relief valve with an adaptive opening and closing housing according to an embodiment of the present invention is shown in the pressure relief end state.

[0028] In the diagram: 1. Base; 11. Drainage port; 2. Valve disc; 3. Top cover; 4. Signal rod; 41. First annular groove; 42. Second annular groove; 5. Helical compression spring; 6. Column; 7. Cover; 71. Cylinder body; 711. Opening; 72. Cylinder cover; 73. Flip plate; 8. Elastic movable push rod; 9. Micro switch. Detailed Implementation

[0029] Various embodiments of the invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are indicated by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0030] This invention provides a pressure relief valve with an adaptive opening and closing housing, see [link to relevant documentation]. Figure 1The pressure relief valve with an adaptive opening and closing cover includes a valve body and a cover 7. The valve body includes a base 1, a top cover 3, columns 6, a valve disc 2, and an elastic element. The top cover 3 is located above the base 1 and is connected to the base 1 via multiple columns 6. A vent 11 is located in the middle of the base 1. The valve disc 2 covers the vent 11 of the base 1. The elastic element is located between the top cover 3 and the valve disc 2, and its elastic force presses the valve disc 2 tightly against the vent 11 of the base 1. The cover 7 covers the outside of the valve body. At least one set of openings is provided on the side wall of the cover 7. Each set of openings includes two symmetrically arranged openings 711, and each opening 711 is provided with an automatically closing flap 73.

[0031] Specifically, the pressure relief valve with an adaptive opening and closing cover is installed at the pressure relief port of the oil chamber of the power equipment (transformer or tap changer) via a base 1. The pressure relief port 11 of the base 1 corresponds to the pressure relief port of the oil chamber. One end of the base 1 is a connecting flange, and the other end is a support plate extending outward. The connecting flange of the base 1 is fixedly connected to the oil chamber by multiple bolts. The lower end of the cover 7 is connected to the edge of the support plate of the base 1 by screws. Multiple columns 6 are circumferentially distributed around the pressure relief port 11 of the base 1. The bottom end of the column 6 is fixedly connected to the support plate of the base 1, and the top end of the column 6 is fixedly connected to the cover plate. By adjusting the distance between the base 1 and the top cover 3, the pre-compression amount of the elastic element can be adjusted, thereby controlling the pre-compression force and the opening pressure of the valve disc 2. A sealing element is provided at the edge of the pressure relief port 11, so that the valve disc 2 and the pressure relief port 11 are reliably sealed to prevent leakage. The sealing element at the edge of the pressure relief port 11 can be an O-ring or other structural sealing element.

[0032] When an electric arc fault occurs in the power equipment, a large amount of high-temperature and high-pressure oil and gas is instantaneously generated in the oil chamber. The pressure in the oil chamber increases, pushing the valve disc 2 to move in the direction of compression of the elastic element, disengaging from the base 1 and opening the vent 11, thus opening the venting channel. The high-temperature and high-pressure oil and gas flows out from the vent 11, which in turn pushes the flap 73 on the cover 7 to open, increasing the venting area and reducing the flow resistance. The internal pressure of the pressure relief valve can be significantly reduced, improving the safety and operational stability of the pressure relief valve body. The symmetrically arranged openings 711 on the cover 7 can effectively balance the force of the valve disc 2, preventing the valve disc 2 from being offset and overturned during movement, which would lead to sealing problems when the valve disc 2 is reset.

[0033] In this pressure relief valve with an adaptive opening and closing housing, the elastic element is a helical compression spring, and the two ends of the helical compression spring 5 abut against the top cover 3 and the valve disc 2, respectively. Figure 1As shown, in this embodiment, two helical compression springs with different diameters are provided between the top cover 3 and the valve disc 2. The two helical compression springs 5 ​​are coaxially arranged, with the larger diameter helical compression spring sleeved on the outside of the smaller diameter helical compression spring. This arrangement makes the elastic force on the valve disc 2 more uniform, and the valve disc 2 is more stable and reliable when pressed against the vent 11. In this embodiment, the bottom of the top cover 3 and the top of the valve disc 2 are provided with annular grooves, and the ends of the helical compression springs 5 ​​are placed in the corresponding annular grooves, thereby preventing the helical compression springs 5 ​​from moving laterally.

[0034] The pressure relief valve with an adaptive opening and closing housing also includes a signal rod 4. The lower end of the signal rod 4 abuts against the valve disc 2, and the upper end of the signal rod 4 passes through the top cover 3 and the housing 7 and extends to the outside of the housing 7. The signal rod 4 is provided with a first annular groove 41 at its upper end. The top cover 3 is provided with a flexible movable push rod 8 and a micro switch 9. The first end of the flexible movable push rod 8 abuts against the first annular groove 41 of the signal rod 4, and the second end of the flexible movable push rod 8 is connected to the micro switch 9. When the valve disc 2 pushes the signal rod 4 upward, the first end of the flexible movable push rod 8 slides out of the first annular groove 41, and the flexible movable push rod 8 moves laterally to compress the micro switch 9, thereby causing the micro switch 9 to emit an electronic signal.

[0035] Specifically, both the top cover 3 and the top wall of the housing 7 have through holes for the signal rod 4 to pass through, and the upper end of the signal rod 4 extends to the outside of the housing 7. There is a receiving space between the top cover 3 and the top wall of the housing 7, and the elastic movable push rod 8 and the micro switch 9 are both installed in the receiving space between the top cover 3 and the top wall of the housing 7. In a specific implementation, a support seat for the lateral sliding of the elastic movable push rod 8 can be provided on the top of the top cover 3. The elastic movable push rod 8 is slidably mounted on the support seat, and a spring is provided between the elastic movable push rod 8 and the support seat. The elastic force of the spring makes the first end of the elastic movable push rod 8 always abut against the signal rod 4. The first end of the elastic movable push rod 8 is located at the through hole position of the top cover 3, and the micro switch 9 is located on one side of the elastic movable push rod 8 and connected to the second end of the elastic movable push rod 8. When the valve disc 2 is placed over the vent 11 of the base 1, the first annular groove 41 on the signal rod 4 is exactly in the receiving space between the top cover 3 and the top wall of the housing 7. The first end of the elastic movable push rod 8 abuts against the first annular groove 41 of the signal rod 4, and the micro switch 9 is in state 1. At this time, the signal rod 4 and the housing flap 73 are in the following states: Figure 2As shown; when the pressure in the oil chamber increases, the valve disc 2 moves upward to open the vent 11 to release pressure, pushing the signal rod 4 upward. The first end of the elastic movable push rod 8 slides out of the first annular groove 41 and abuts against the outer circumferential surface of the signal rod 4. When the first end of the elastic movable push rod 8 slides out of the first annular groove 41, the elastic movable push rod 8 moves horizontally away from the signal rod 4, thereby compressing the micro switch 9. At this time, the micro switch 9 is in state 2 and triggers an electronic signal, which can be used to issue an alarm to notify the power equipment monitoring personnel. At this time, the states of the signal rod 4 and the cover flap 73 are as follows. Figure 3 As shown.

[0036] Furthermore, the signal rod 4 is also provided with a second annular groove 42, which is set at a preset distance from the first annular groove 41. When the signal rod 4 moves downward under its own weight, the first end of the elastic movable push rod 8 can slide into the second annular groove 42, thereby preventing the signal rod 4 from continuing to move downward.

[0037] Specifically, when the pressure relief valve with an adaptive opening and closing cover depressurizes the oil chamber, the valve disc 2 pushes the signal rod 4 upward, causing the second annular groove 42 on the signal rod 4 to pass through the cover 7 and move to the outside of the cover 7. After depressurization is complete, the valve disc 2, under the elastic force of the elastic element, re-covers the vent 11, and the signal rod 4 moves downward under its own weight. Since the first end of the elastic movable push rod 8 always abuts against the signal rod 4, when the second annular groove 42 of the signal rod 4 moves downward to the position of the first end of the elastic movable push rod 8, the first end of the elastic movable push rod 8 slides into the second annular groove 42 and abuts against the second annular groove 42, thereby blocking the signal rod 4 and preventing the signal rod 4 from continuing to move downward under its own weight. The signal rod 4 stays at this position, making the upper end of the signal rod 4 clearly protrude from the cover 7, serving as a direct physical signal. At this time, the state of the signal rod 4 and the cover flap 73 is as follows: Figure 4 As shown.

[0038] In this embodiment, two elastic movable push rods 8 and two micro switches 9 are provided, and the two elastic movable push rods 8 and two micro switches 9 are symmetrically arranged on both sides of the signal rod 4. The first end of the elastic movable push rod 8 is provided with a roller, so that the friction is reduced during the up and down movement of the signal rod 4 and the up and down movement is smoother. The upper side wall of the first annular groove 41 and the upper side wall of the second annular groove 42 are both perpendicular to the axis of the signal rod 4, so that when the first end of the elastic movable push rod 8 abuts in it, it is easier to prevent the signal rod 4 from continuing to move downward. The lower side wall of the first annular groove 41 and the lower side wall of the second annular groove 42 are both inclined surfaces, so that when the signal rod 4 moves upward, the first end of the elastic movable push rod 8 can slide out more easily.

[0039] The casing 7 includes a cylindrical body 71 and a cylindrical cover 72. The cylindrical cover 72 seals the top of the cylindrical body 71. The cross-section of the cylindrical body 71 is a regular polygon with an even number of sides. Each set of openings 711 is formed on two parallel side walls of the cylindrical body 71. In this embodiment, the cross-section of the cylindrical body 71 is a regular quadrilateral, and two openings 711 are symmetrically formed on the cylindrical body 71, which are formed on two parallel side walls of the cylindrical body 71. When depressurization occurs, the high-pressure oil and gas released from the oil chamber can be released through the two symmetrically arranged openings 711. The two symmetrically arranged openings 711 on the casing 7 can effectively balance the force of the valve disc 2, preventing the valve disc 2 from being offset and overturned during movement, thus avoiding sealing problems when the valve disc 2 is reset. It is understandable that when the cross-section of the cylinder 71 of the cover 7 is a regular hexagon or a regular octagon, multiple sets of openings can be provided on its cylinder 71. Each set of openings includes two symmetrically arranged openings 711. This increases the discharge area and reduces the flow resistance of the cover 7, while also effectively balancing the force of the valve disc 2 and avoiding sealing problems caused by the offset and flipping of the valve disc 2.

[0040] In the housing 7, a flap 73 is rotatably connected to the opening 711 via a pivot. Preferably, the pivot is located at the upper edge of the opening 711, allowing the flap 73 to automatically close onto the opening 711 of the housing 7 under its own weight. To facilitate the flap 73's automatic closure onto the opening 711 and its automatic return to the closed state after depressurization, a torsion spring is provided on the pivot. Specifically, one end of the torsion spring contacts the outer wall of the cylinder 71 at the upper edge of the opening 711, and the other end contacts the outer wall of the flap 73. To ensure a good seal at the opening 711 when the flap 73 is closed, a sealing element is provided at the edge of the opening 711. This sealing element can be a circumferentially closed silicone rubber gasket or other types of sealing elements.

[0041] The cover 7 and the flap 73 can be made of corrosion-resistant and all-weather-resistant thin-walled metal materials, such as stainless steel or aluminum alloy thin-walled metal sheets processed by stamping or punching. The cover 7 and the flap 73 can also be made of polymer materials, such as engineering plastics and polymers with three-proof capabilities.

[0042] In summary, the pressure relief valve with an adaptive opening and closing cover provided by the present invention has a fully enclosed cover covering the valve body, which can better protect the valve body components; when the oil chamber pressure rises, the valve disc opens to release pressure, and the flap on the cover automatically opens during pressure release, increasing the release area and reducing the flow resistance, thereby enhancing the overall pressure relief valve's release capacity; the openings on the cover are symmetrically arranged, which can effectively balance the force of the valve disc during pressure release, preventing the valve disc from being offset and overturned during movement, thereby achieving reliable sealing of the oil chamber.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A pressure relief valve with an adaptive opening and closing housing, characterized in that, Includes valve body and housing; among which, The valve body includes a base, a top cover, columns, a valve disc, and an elastic element. The top cover is located above the base, and the top cover and the base are connected by a plurality of columns. A vent is provided in the middle of the base, and the valve disc is placed on the vent of the base. The elastic element is located between the top cover and the valve disc, and the elastic force of the elastic element presses the valve disc tightly against the vent of the base. The valve body also includes a signal rod, the lower end of which abuts against the valve disc, and the upper end of which passes through the top cover and the housing and extends to the outside of the housing. The signal rod has a first annular groove at its upper end. The top cover has a flexible push rod and a micro switch. The first end of the flexible push rod abuts in the first annular groove of the signal rod, and the second end of the flexible push rod is connected to the micro switch. When the valve disc pushes the signal rod upward, the first end of the flexible push rod slides out of the first annular groove, and the flexible push rod moves laterally to compress the micro switch, thereby causing the micro switch to emit an electronic signal. The signal rod is also provided with a second annular groove, which is set at a preset distance from the first annular groove; when the signal rod moves downward by its own weight, the first end of the elastic movable push rod can slide into the second annular groove, thereby preventing the signal rod from continuing to move downward; The cover is installed outside the valve body. At least one set of openings is provided on the side wall of the cover. Each set of openings includes two symmetrically arranged openings. Each opening is provided with a flap that can be automatically closed.

2. The pressure relief valve with an adaptive opening and closing housing according to claim 1, characterized in that, The elastic element is a helical compression spring, with its two ends abutting against the top cover and the valve disc, respectively.

3. The pressure relief valve with an adaptive opening and closing housing according to claim 1, characterized in that, The casing includes a cylindrical body and a cylindrical cover. The cylindrical cover is placed on the top of the cylindrical body. The cross-section of the cylindrical body is a regular polygon with an even number of sides. Each set of openings is formed on two parallel side walls of the cylindrical body.

4. The pressure relief valve with an adaptive opening and closing housing according to claim 3, characterized in that, The flap is rotatably connected to the opening via a rotating shaft.

5. The pressure relief valve with an adaptive opening and closing housing according to claim 4, characterized in that, The pivot is located at the upper edge of the opening.

6. The pressure relief valve with an adaptive opening and closing housing according to claim 4, characterized in that, A torsion spring is provided on the rotating shaft.

7. The pressure relief valve with an adaptive opening and closing housing according to claim 1, characterized in that, Both the edge of the vent and the edge of the opening are provided with sealing elements.

8. The pressure relief valve with an adaptive opening and closing housing according to claim 1, characterized in that, The cover and the flap are made of stainless steel, aluminum alloy or polymer materials.

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