Pressure relief valve

Abstract

The invention discloses a pressure relief valve, comprising: a valve body; and the plurality of discharge units are arranged in the valve body. According to the pressure relief valve, a module combination is formed through the multiple small relief units, a large relief area is formed, and due to the fact that the area of each relief unit is small, a membrane disc is small in mass and fast in response, and the requirement for large relief flow is met while fast response is achieved; according to the pressure relief valve, the number of the relief units can be selectively increased or decreased according to use scenes, different relief areas can be obtained, pressure relief valves with different relief calibers can be developed, only the shell and the valve seat which are matched need to be selected or designed, modular design and manufacturing are achieved, additional design and experiment do not need to be carried out, and the development cost is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and more specifically, to a pressure relief valve. Background Art

[0002] When a high-voltage transformer has a resistance fault, arc discharge will occur. Arc discharge causes the insulating oil to crack, and a large amount of high-pressure oil and gas will be formed instantly. The transformer tank is a closed space. The rapid gas production process forms a pressure shock wave. If there is no pressure release device, the overpressure generated by the oil and gas will destroy the structure of the transformer tank equipment and spray out from the cracks, which may cause oil and gas explosions, seriously threatening the safety of personnel and equipment. To solve the above problems, a pressure relief valve is generally installed on the transformer tank. When the pressure rises to the opening pressure, the pressure relief valve opens quickly to discharge the high-temperature and high-pressure oil and gas to release the internal pressure, protect the components, and prevent combustion and explosion. After the pressure relief is completed, the pressure relief valve is closed to isolate the residual oil and gas in the oil chamber to prevent secondary combustion and explosion.

[0003] The existing pressure relief valve consists of a set of bases, diaphragm discs, springs and related fixed installation structures. When the internal oil pressure reaches the set value, the pressure overcomes the spring force to push the diaphragm disc up rapidly, and the nozzle sprays oil and gas outward; the discharge process when the internal resistance of the transformer tank fails is generally a few milliseconds, so the opening speed of the pressure relief valve is very high, requiring a millisecond-level response speed. Under a certain pressure, the quality of the diaphragm disc is the main factor affecting the opening speed of the pressure relief valve. When a resistance failure occurs inside the transformer tank, the pressure relief valve opens very quickly, and the diaphragm disc moves at high speed under the action of the sprayed oil and gas, squeezing the spring until the spring dies and then strongly hits the top cover. Therefore, the diaphragm disc needs to have a certain strength, otherwise it will be severely deformed during the impact and cannot be reliably reset. When designing a large-caliber pressure relief valve, as the nozzle area increases, the diaphragm area also increases synchronously. When the area increases, the thickness of the diaphragm also needs to increase accordingly, otherwise the rigidity of the diaphragm structure will decrease, which will lead to an increase in the mass of the diaphragm, which exceeds the increase in the area of ​​the diaphragm. As a result, the larger the discharge diameter of the pressure relief valve, the slower the response speed, and the pressure relief requirements of the transformer tank are not met. At the same time, when the transformer tank has different sizes of discharge diameters, large-caliber pressure relief valves need to be specially developed and researched, and the design and trial production cycle is long, while the total demand is not large, especially for the discharge test cost of the transformer tank resistance fault is extremely high, so there is basically no large-caliber pressure relief valve product that meets the needs of the transformer tank. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a pressure relief valve, aiming to solve the problems existing in the prior art.

[0005] According to the present invention, there is provided a pressure relief valve, comprising:

[0006] Valve body;

[0007] A plurality of discharge units are arranged in the valve body.

[0008] Preferably, the discharge unit includes a pressure sensing port, a diaphragm disc and a spring, the diaphragm disc is sealed on the pressure sensing port, the upper end of the spring is pressed against the valve body, and the lower end is pressed against the diaphragm disc, and the diaphragm disc is pressed against the pressure sensing port through the spring.

[0009] Preferably, the discharge unit further comprises a plurality of support columns, each of which is arranged around the diaphragm disc.

[0010] Preferably, the discharge unit further comprises a sealing assembly, wherein the sealing assembly comprises a pressure ring and a sealing ring, and the sealing ring is fixed to the pressure sensing port via the pressure ring.

[0011] Preferably, the valve body comprises a base and an upper cover, and the upper cover is connected to the base.

[0012] Preferably, the valve body further comprises a shell and an upper cover, the shell is connected between the base and the upper cover, and the upper cover is disposed on the upper cover.

[0013] Preferably, the shell is provided with a plurality of discharge ports, the discharge ports are provided with a sealing plate, and the sealing plate is rotatably provided on the shell.

[0014] Preferably, the pressure sensing port is opened on the base of the valve body.

[0015] Preferably, the discharge unit further comprises a signal rod and a micro switch, the upper end of the signal rod is slidably inserted on the valve body, the lower end of the signal rod abuts against the diaphragm disc, the micro switch is arranged on the valve body, and the upper end of the signal rod is transmission-connected to the micro switch;

[0016] When the membrane disc is opened, the signal rod is pushed upward, and the signal rod pushes the micro switch to operate, thereby triggering the micro switch.

[0017] Preferably, a plurality of discharge units are arranged in an array.

[0018] Compared with the existing technology, the present invention has the following beneficial technical effects:

[0019] 1. The array-type pressure relief valve provided by the present application forms a module combination through a plurality of small discharge units to form a larger discharge area. Since each discharge unit has a small area, the diaphragm disc has a small mass and a fast response, thereby achieving a fast response and meeting the demand for a large discharge flow rate.

[0020] 2. The array-type pressure relief valve provided by the present application can increase or decrease the number of relief units according to the usage scenario. By increasing or decreasing the number of relief units, different relief areas can be obtained. To develop pressure relief valves with different relief calibers, it is only necessary to reselect or design the matching shell and valve seat, thus realizing modular design and production. No additional design and experiment are required, which greatly reduces the development cost.

[0021] 3. The array pressure relief valve provided in the present application can be arranged in a variety of shapes, including but not limited to round, square, L-shaped, etc., and can be planned according to the top and side spaces of transformer oil tanks of different models to make full use of the layout space. All discharged oil and gas are discharged through the discharge channel on the same shell, which is convenient for the use of external fire prevention measures such as inert gas and vacuum chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0023] Figure 1 Schematic diagram of the three-dimensional structure of a pressure relief valve according to an embodiment of the present invention.

[0024] Figure 2 Schematic diagram of the three-dimensional structure of the internal structure of a pressure relief valve according to an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the base of the pressure relief valve according to an embodiment of the present invention.

[0026] Figure 4 Schematic diagram of the internal structure of a pressure relief valve according to an embodiment of the present invention.

[0027] Figure 5 for Figure 4 Enlarged view of part A in .

[0028] In the figure: base 11, upper cover 12, shell 13, cover plate 131, upper cover 14, pressure sensing port 21, diaphragm disc 22, spring 23, support column 24, pressure ring 251, sealing ring 252, signal rod 26, micro switch 27. DETAILED DESCRIPTION

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

[0030] like Figures 1 to 5As shown, the present invention provides a pressure relief valve, which includes a valve body and a plurality of relief units, wherein the plurality of relief units are arranged in the valve body.

[0031] The valve body includes a base 11 and an upper cover 12, and the upper cover 12 is connected to the base 11. Further, the valve body also includes a shell 13 and an upper cover 14, the shell 13 is connected between the base 11 and the upper cover 12, and multiple discharge units are enclosed therein, and the upper cover 14 is covered on the upper cover 12. A closed cavity is formed between the shell 13, the base 11 and the upper cover 12, which is used to accommodate multiple discharge units, thereby achieving waterproof and dustproof effects on the discharge units.

[0032] The housing 13 is provided with a plurality of discharge ports, and a cover plate 131 is provided on the discharge ports, and the cover plate 131 is rotatably provided on the housing 13. In this embodiment, a total of four discharge ports are provided, each of which is arranged around a plurality of discharge units, and a cover plate 131 is correspondingly provided for each discharge port, and the upper end of each cover plate 131 is hinged to the housing 13 via a hinge.

[0033] The discharge unit includes a pressure sensing port 21, a diaphragm 22 and a spring 23. The diaphragm 22 is sealed on the pressure sensing port 21. The upper end of the spring 23 is pressed against the valve body, and the lower end is pressed against the diaphragm 22. The diaphragm 22 is pressed against the pressure sensing port 21 through the spring 23. In this embodiment, the spring 23 includes an inner ring spring 23 and an outer ring spring 23. The inner ring spring 23 is coaxially arranged in the outer ring spring 23, and the inner ring spring 23 is thinner than the outer ring spring 23, and the elastic coefficient of the inner ring spring 23 is smaller than the elastic coefficient of the outer ring spring 23.

[0034] Furthermore, the discharge unit further includes a plurality of support columns 24 , each of which is disposed around the membrane disc 22 to support the corresponding discharge unit.

[0035] Furthermore, the discharge unit further includes a sealing assembly, which includes a pressure ring 251 and a sealing ring 252, and the sealing ring 252 is fixed to the pressure sensing port 21 through the pressure ring 251. In this embodiment, the pressure sensing port 21 is opened on the base 11 of the valve body, and the transformer oil tank is connected to each pressure sensing port 21. When the oil in the transformer oil tank is higher than the preset pressure, the pressure is released through the pressure sensing port 21. The sealing ring 252 includes a fixing ring, a connecting ring and a sealing ring, and the fixing ring and the sealing ring are connected through the connecting ring, and the fixing ring and the sealing ring are spaced apart by a preset distance in the axial direction, and the fixing ring and the sealing ring are respectively arranged perpendicular to the connecting ring, and the fixing ring and the sealing ring extend in opposite directions. A recessed portion is provided on the outer periphery of the pressure sensing port 21 on the base 11, and a fixing ring is fixed to the recessed portion by bolts. The sealing ring covers the upper edge of the pressure sensing port 21, so that the sealing ring is squeezed between the diaphragm disk 22 and the upper edge of the pressure sensing port 21, thereby achieving sealing between the pressure diaphragm disk 22 and the pressure sensing port 21.

[0036] A discharge channel is formed between the pressure sensing port 21, the sealed chamber formed between the upper cover 12, the base 11 and the shell, and the discharge port.

[0037] Further, the discharge unit further comprises a signal rod 26 and a micro switch 27. The upper ends of the micro switch 27 and the signal rod 26 are arranged on the top wall of the upper cover 12 and are covered in the upper cover 14. The upper end of the signal rod 26 can be slidably inserted on the valve body, and the lower end of the signal rod 26 abuts on the diaphragm disc 22. The micro switch 27 is arranged on the valve body. The upper end of the signal rod 26 is transmission-connected with the micro switch 27, which can be specifically a conical portion on the signal rod 26, which squeezes the trigger rod of the micro switch 27 when the conical portion moves upward. When the diaphragm disc 22 is opened, the signal rod 26 is pushed upward, and the signal rod 26 pushes the micro switch 27 to operate, thereby triggering the micro switch 27.

[0038] In one embodiment, a plurality of the discharge units are arranged in an array, and the array combination arrangement can form a variety of shapes, including but not limited to circular, square, L-shaped, etc., which can be planned according to the top and side spaces of the transformer oil tank of different models to make full use of the layout space, and all the discharged oil and gas are discharged through the discharge port on the same shell 13, which is convenient for using external fire prevention measures such as inert gas and vacuum chamber.

[0039] In another embodiment, the plurality of relief units are divided into a plurality of specifications, and the opening pressure of the relief units of each specification is the same, and the relief units of the same specification are arranged in an array, and the relief units of different specifications can match the pressure in the transformer tank to open the relief units of the corresponding specifications, thereby opening the relief units of the matching specifications to release the pressure. In this way, the pressure release ladder and the flexibility of use of the pressure release valve are greatly increased, so that the pressure release has both sensitivity and stability, and the applicability is greatly improved.

[0040] When the pressure relief valve is used, the base 11 of the pressure relief valve is fixedly mounted on the transformer oil tank, so that the multiple pressure sensing ports 21 on the base 11 are connected to the inside of the oil tank. When the internal pressure of the transformer oil tank reaches the set value, the pressure pushes each diaphragm 22 to overcome the force of the spring 23 and rise. At the same time, the diaphragm 22 drives the signal rod 26 to rise, pushing the micro switch 27 in contact with the signal rod 26 to send an opening electrical signal. During the rising process of the diaphragm 22, the spring 23 is compressed. When the internal pressure value reaches the preset value, the spring 23 is compressed to the limit, and the diaphragm 22 stops rising. After the diaphragm 22 is opened, the oil and gas inside the transformer gushes out from the pressure sensing port 21, filling the closed cavity formed by the shell 13, the base 11 and the upper cover 12. Under the pressure of the oil and gas, the cover plate 131 connected to the shell 13 by the hinge rotates open to form a discharge channel to the outside, and the oil and gas are discharged to the outside, thereby realizing the pressure release in the transformer mailbox.

[0041] The pressure relief valve in this application achieves the following technical effects:

[0042] 1. The array-type pressure relief valve provided by the present application forms a module combination through a plurality of small discharge units to form a larger discharge area. Since each discharge unit has a small area, the diaphragm disc 22 has a small mass and a fast response, thereby achieving a fast response and meeting the demand for a large discharge flow rate.

[0043] 2. The array-type pressure relief valve provided by the present application can increase or decrease the number of relief units according to the usage scenario. By increasing or decreasing the number of relief units, different relief areas can be obtained. To develop pressure relief valves with different relief calibers, it is only necessary to reselect or design the matching housing 13 and valve seat, thus realizing modular design and manufacturing, and no additional design and experiment are required, which greatly reduces the development cost.

[0044] 3. The array pressure relief valve provided in the present application can be arranged in a variety of shapes, including but not limited to circular, square, L-shaped, etc., and can be planned according to the top and side spaces of transformer oil tanks of different models to make full use of the layout space. All discharged oil and gas are discharged through the discharge channel on the same shell 13, which is convenient for the use of external fire prevention measures such as inert gas and vacuum chamber.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0046] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present invention.

Claims

1. A pressure relief valve, characterized in that: include: Valve body; A plurality of discharge units are arranged in the valve body.

2. The pressure relief valve according to claim 1, characterized in that: The discharge unit includes a pressure sensing port, a diaphragm disc and a spring. The diaphragm disc is sealed on the pressure sensing port. The upper end of the spring is pressed against the valve body, and the lower end is pressed against the diaphragm disc. The diaphragm disc is pressed against the pressure sensing port through the spring.

3. The pressure relief valve according to claim 2, characterized in that: The discharge unit further comprises a plurality of support columns, each of which is arranged around the membrane disc.

4. The pressure relief valve according to claim 3, characterized in that: The discharge unit further comprises a sealing assembly, wherein the sealing assembly comprises a pressure ring and a sealing ring, and the sealing ring is fixed to the pressure sensing port via the pressure ring.

5. The pressure relief valve according to claim 1, characterized in that: The valve body comprises a base and an upper cover, and the upper cover is connected to the base.

6. The pressure relief valve according to claim 5, characterized in that: The valve body further comprises a shell and an upper cover, wherein the shell is connected between the base and the upper cover, and the upper cover is disposed on the upper cover.

7. The pressure relief valve according to claim 6, characterized in that: The shell body is provided with a plurality of discharge ports, and the discharge ports are provided with a sealing plate, and the sealing plate is rotatably arranged on the shell body.

8. The pressure relief valve according to claim 2, characterized in that: The pressure sensing port is opened on the base of the valve body.

9. The pressure relief valve according to claim 2, characterized in that: The discharge unit further comprises a signal rod and a micro switch, wherein the upper end of the signal rod is slidably inserted on the valve body, the lower end of the signal rod abuts against the membrane disc, the micro switch is arranged on the valve body, and the upper end of the signal rod is transmission-connected to the micro switch; When the membrane disc is opened, the signal rod is pushed upward, and the signal rod pushes the micro switch to operate, thereby triggering the micro switch.

10. The pressure relief valve according to claim 1, characterized in that A plurality of discharge units are arranged in an array.

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