Valve knife device for pressure relief drain valve and containment

Abstract

The utility model discloses a valve knife device for a pressure relief drain valve and a containment vessel, and belongs to the technical field of valves. The valve knife comprises a cylinder and a valve knife holder arranged in the cylinder, a plurality of main blades are detachably connected to the valve knife holder, each main blade is provided with a main blade head, blade lines of the main blade heads extend in a conical shape from the peripheral side of the cylinder to the center of the cylinder, one main blade is provided with a puncturing head, and the other main blade is provided with a cutting edge. The piercing head is arranged in a conical shape and located in the center of the cylinder body, and the blade face of the piercing head is flush with and in butt joint with the blade face of the main blade head. The method has the effects of reducing the maintenance cost and improving the maintenance convenience.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and in particular to a valve blade device and a containment for a pressure relief discharge valve. Background Art

[0002] The containment pressure relief discharge device belongs to the equipment of safety class II, and has extremely high requirements for the reliability, accuracy, etc. of the equipment. The existing pressure relief safety devices are difficult to meet the increasingly high nuclear safety requirements. At present, the pressure relief of the containment or auxiliary building is mainly achieved by a pressure relief safety device composed of a rupture disk and a holder, etc. When the pressure difference on both sides of the rupture disk reaches the preset value at a preset temperature, the rupture disk ruptures or falls off, and the pressure medium is discharged. However, affected by the rupture disk material, processing, installation progress, etc., there is usually a large error between the calibrated bursting pressure of the rupture disk and the design value.

[0003] In the related art, the patent with publication number CN116592170A discloses a piston drive mechanism for a pressure relief discharge valve, including a valve cover, a piston, a valve rod, a return spring and a bellows; the valve cover includes a cover plate, a first accommodation section and a second accommodation section connected in sequence; the cover plate is installed at the inlet end of the valve body; a first accommodation cavity for accommodating the piston is provided in the first accommodation section, and a second accommodation cavity for accommodating the valve rod and the return spring is provided in the second accommodation section, and the return spring is assembled on the valve rod; the piston is hermetically connected to the first accommodation cavity; the front end of the valve rod is connected to the piston, and the rear end of the valve rod passes out of the second accommodation cavity. The beneficial effect of the present invention is that the piston drive mechanism of the present invention is automatically and reliably started under the action of differential pressure, drives the valve blade structure to cut the rupture diaphragm, discharges the high-temperature and high-pressure gas in the containment to a preset area, realizes reliable pressure relief of the containment, and ensures the integrity of the radioactive containment barrier. The reliability of the pressure relief discharge valve of the containment is high.

[0004] In view of the above related art, the valve blade structure includes a cylinder body 8.3, a central seat 8.1, a connecting rib plate 8.2 and a blade 8.4. The central seat 8.1 is connected with three connecting rib plates 8.2, and three blades 8.4 are correspondingly arranged. The blades 8.4 are formed by grinding the edges of the connecting rib plates 8.2; the cutting direction of the blades 8.4 is directly opposite to the rupture diaphragm 11 of the pressure relief discharge valve, and the inner end of the blade 8.4 (corresponding to the end where the connecting rib plate 8.2 is connected to the central seat 8.1) protrudes relative to the outer end, and the inner ends of the three blades 8.4 are connected to form a conical structure. The valve blade structure is an integrally formed structure. When maintenance of the valve blade structure is required, the entire valve blade structure needs to be replaced, and the maintenance steps are cumbersome and the maintenance cost increases. Utility Model Content

[0005] In order to reduce the maintenance cost, the present application provides a valve blade device and a containment for a pressure relief discharge valve.

[0006] The present application provides a valve knife device for a pressure relief discharge valve using the following technical solution:

[0007] A valve knife device for a pressure relief discharge valve comprises a cylinder and a valve knife seat arranged in the cylinder, a plurality of main blades are detachably connected to the valve knife seat, the main blades are provided with main cutting heads, the cutting lines of the plurality of main cutting heads extend in a cone shape from the circumference of the cylinder to the center of the cylinder, one of the main blades is provided with a piercing head, the piercing head is arranged in a cone shape and is located in the center of the cylinder, and the cutting surface of the piercing head is flush with the cutting surface of the main cutting head.

[0008] By adopting the above technical solution, since the main blade is detachably connected to the valve blade seat, only the damaged or worn main blade needs to be replaced during maintenance, without replacing the entire valve blade device, thereby reducing maintenance costs and improving maintenance convenience. At the same time, the most worn part is set as a puncture head connected to a main blade. After long-term use, the main blade can be quickly replaced to improve maintenance efficiency. In addition, the material of the most worn puncture head can also be selected to be different from that of other main blade heads, which helps to increase the service life.

[0009] Optionally, a mounting notch is provided on a side of the main blade that is not provided with a piercing head and close to the center of the barrel, and a side of the piercing head that is away from its own blade surface abuts against an inner wall of the mounting notch.

[0010] By adopting the above technical solution, when the puncture head is used for puncturing, the force direction of the puncture head is the axial direction, and the installation notch can effectively support the puncture head to ensure the service life of the puncture head.

[0011] Optionally, the puncturing head is integrally formed.

[0012] By adopting the above technical solution, the structural strength of the puncturing head is enhanced, ensuring that it is not easily damaged during the cutting process.

[0013] Optionally, the main blade is integrally formed with the piercing head and the main cutting head.

[0014] By adopting the above technical solution, this structure simplifies the manufacturing process and improves the connection strength between the main blade and the piercing head.

[0015] Optionally, the valve knife seat includes a connecting seat and a rib plate installed on the connecting seat, and one end of the rib plate away from the connecting seat is connected to the cylinder.

[0016] By adopting the above technical solution, such a design makes the valve knife seat structure more stable and can withstand greater cutting force.

[0017] Optionally, a mounting plate is provided on the side of the main blade away from the blade surface, the plate surface of the mounting plate is fitted with the plate surface of the rib plate, the side of the main blade away from the blade surface is abutted against the side edge of the rib plate, and the mounting plate is detachably connected to the rib plate.

[0018] By adopting the above technical solution, this installation method is simple and firm, which is convenient for quick replacement of the main blade. In addition, it can also support the force of the main blade and ensure the stability of the structure.

[0019] Optionally, a secondary blade is installed on a side of the main blade close to the barrel, and the secondary blade is provided with a secondary cutting head, and the extending direction of the cutting line of the secondary cutting head is opposite to the extending direction of the cutting line of the main cutting head.

[0020] By adopting the above technical solution, the design of the auxiliary blade further enhances the cutting effect, improves the efficiency of puncturing the bursting membrane, and further improves the safety of pressure relief.

[0021] Optionally, the secondary blade is detachably connected to the primary blade.

[0022] By adopting the above technical solution, the auxiliary blades can also be replaced separately when necessary, further reducing maintenance costs.

[0023] A containment shell comprises the above-mentioned valve knife device for a pressure relief discharge valve.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. During maintenance, only the damaged or worn main blade needs to be replaced, without replacing the entire valve blade device, thereby reducing maintenance costs and improving maintenance convenience. At the same time, the most worn part is set as the piercing head connected to a main blade. After long-term use, the main blade can be quickly replaced to improve maintenance efficiency.

[0026] 2. The valve knife seat structure design of the present application is stable and can withstand large cutting forces, further improving the reliability of the pressure relief valve.

[0027] 3. The design of the auxiliary blade further enhances the cutting effect, improves the efficiency of puncturing the bursting diaphragm, and further improves the safety of pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 This is a schematic diagram of the structure of the embodiment of the present application, which mainly shows the main blade and the auxiliary blade.

[0030] Description of reference numerals:

[0031] 10. Cylinder body; 20. Valve knife seat; 21. Connecting seat; 22. Rib plate; 30. Main blade; 31. Main blade head; 32. Mounting plate; 33. Piercing head; 34. Mounting notch; 40. Auxiliary blade; 41. Auxiliary blade head. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-2 This application is described in further detail.

[0033] Example 1

[0034] A valve knife device for a pressure relief discharge valve provided in an embodiment of the present application is provided with reference to Figure 1 and Figure 2 , comprising a cylinder 10 and a valve knife seat 20. The valve knife seat 20 is arranged in the cylinder 10, wherein the valve knife seat 20 comprises a connecting seat 21 and a rib plate 22 mounted on the connecting seat 21, and one end of the rib plate 22 away from the connecting seat 21 is connected to the cylinder 10. The connecting seat 21 is used to connect with the piston drive mechanism of the pressure relief discharge valve, and the piston drive mechanism is used to drive the connecting seat 21 to move, thereby driving the valve knife device to operate.

[0035] Among them, the main blade 30 is detachably connected to the rib plate 22, and the main blade 30 is provided with a main blade head 31. The blade lines of these main blade heads 31 extend in a cone shape from the peripheral side of the cylinder 10 to the center of the cylinder 10. Such a design enables multiple main blade heads 31 to work together to form a continuous and concentrated cutting surface, thereby improving the cutting efficiency. Preferably, a mounting plate 32 is provided on the side of the main blade 30 away from the blade surface, and the plate surface of the mounting plate 32 is in contact with the plate surface of the rib plate 22, and the side of the main blade 30 away from the blade surface is in contact with the side of the rib plate 22. The rib plate 22 and the main blade 30 are connected by bolts. Such a design not only ensures the installation stability of the main blade 30, but also facilitates subsequent disassembly and maintenance. In other embodiments, a mounting hole can also be opened on the side of the rib plate 22, and the mounting plate 32 is inserted into the mounting hole and then connected by bolts.

[0036] In particular, one of the main blades 30 is further provided with a puncturing head 33, which is conically arranged and located at the center of the barrel 10, and the blade surface of the puncturing head 33 is flush with the blade surface of the main blade head 31. Such a design enables the puncturing head 33 to puncture the center position while the main blade head 31 is cutting, further ensuring the complete rupture of the bursting disk.

[0037] Further, on the main blade 30 without the piercing head 33, an installation notch 34 is also formed on the side closer to the center of the cylinder body 10. The side of the piercing head 33 facing away from the cutting edge abuts against the inner wall of the installation notch 34. The provision of this installation notch 34 not only provides an installation space for the piercing head 33, but also plays an effective supporting role when the piercing head 33 performs a piercing action, thereby ensuring the service life of the piercing head 33. Further, a groove can be formed on the inner wall of the installation notch 34, and a protrusion is provided on the side wall of the piercing head 33, and the protrusion is embedded in the groove, further improving the positioning accuracy and installation stability of the piercing head 33.

[0038] Preferably, in order to enhance the structural strength of the piercing head 33 and the service life of the main blade 30, the piercing head 33 is integrally formed, and the main blade 30, the piercing head 33 and the main cutting head 31 are integrally formed. When maintenance is required, the integrally formed main blade 30 can be directly replaced.

[0039] In this embodiment, three rib plates 22 are arranged circumferentially, and the included angle between the three rib plates 22 is 120°. A main blade 30 is installed on each rib plate 22 so as to form a flow channel between the rib plates 22 and the cylinder body 10. The total area of the flow channels between the three rib plates 22 is greater than the total flow cross-sectional area of the pressure relief valve (that is, the flow cross-section of the end interface pipeline of the pressure relief valve), ensuring that the valve flow capacity meets the design requirements. In other embodiments, the rib plates 22 can also be provided in other quantities.

[0040] In addition, in order to further enhance the cutting effect on the bursting diaphragm, a secondary blade 40 is also installed on the side of the main blade 30 close to the cylinder body 10. The secondary blade 40 is provided with a secondary cutting head 41, and the extending direction of its cutting edge line is opposite to the extending direction of the cutting edge line of the main cutting head 31. Such a design enables the main cutting head 31 and the secondary cutting head 41 to form a two-way cutting force during the cutting process, thereby piercing the bursting diaphragm more quickly. At the same time, the secondary blade 40 and the main blade 30 are also detachably connected, facilitating subsequent maintenance and replacement. The detachable connection method can be a bolt connection method.

[0041] The implementation principle of the embodiment of the present application is as follows: The main blade 30 is detachably connected to the valve blade seat 20. During maintenance, only the damaged or worn main blade 30 needs to be replaced, rather than replacing the entire valve blade device, thereby reducing the maintenance cost and improving the maintenance convenience. At the same time, the most worn part is set as the piercing head 33 connected to the main blade 30. After long-term use, the main blade 30 can be quickly replaced, improving the maintenance efficiency. In addition, the material of the most worn piercing head 33 can also be selected to be different from that of other main cutting heads 31, which helps to improve the service life.

[0042] Embodiment 2

[0043] The embodiment of the present application further provides an installation shell, which includes the valve blade device for the pressure relief discharge valve as described in Embodiment 1. Since the valve blade device adopts the design of the detachable main blade 30 and the auxiliary blade 40, during the actual use, once the main blade 30 or the auxiliary blade 40 is damaged or worn, the maintenance personnel only need to replace the corresponding blade part, instead of replacing the whole valve blade device. Such a design not only greatly reduces the maintenance cost, but also improves the convenience and efficiency of maintenance. At the same time, the structural design of the valve blade device is stable and the cutting effect is good, which can ensure the long-term reliable operation of the installation shell under high-pressure environment, providing a strong guarantee for the safe operation of key facilities such as nuclear power plants.

[0044] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A valve knife device for a pressure relief discharge valve, characterized in that, The invention comprises a cylinder (10) and a valve knife seat (20) arranged in the cylinder (10), wherein a plurality of main blades (30) are detachably connected to the valve knife seat (20), and the main blades (30) are provided with main cutting heads (31), and the cutting lines of the plurality of main cutting heads (31) extend in a cone shape from the circumference of the cylinder (10) to the center of the cylinder (10), and one of the main blades (30) is provided with a piercing head (33), and the piercing head (33) is arranged in a cone shape and is located in the center of the cylinder (10), and the cutting surface of the piercing head (33) is flush with the cutting surface of the main cutting head (31).

2. The valve blade device for a pressure relief discharge valve according to claim 1, characterized in that: A mounting notch (34) is provided on a side of the main blade (30) that is not provided with a piercing head (33) and is close to the center of the barrel (10), and a side of the piercing head (33) that is away from its own blade surface abuts against an inner wall of the mounting notch (34).

3. The valve knife device for a pressure relief discharge valve according to claim 1, characterized in that: The piercing head (33) is integrally formed.

4. A valve knife device for a pressure relief discharge valve according to claim 3, characterized in that: The main blade (30) is integrally formed with the piercing head (33) and the main blade head (31).

5. A valve knife device for a pressure relief discharge valve according to claim 1, characterized in that: The valve knife seat (20) comprises a connecting seat (21) and a rib plate (22) mounted on the connecting seat (21), wherein one end of the rib plate (22) away from the connecting seat (21) is connected to the cylinder (10).

6. The valve knife device for a pressure relief discharge valve according to claim 5, characterized in that: A mounting plate (32) is provided on the side of the main blade (30) facing away from the blade surface, the plate surface of the mounting plate (32) is in contact with the plate surface of the rib plate (22), the side of the main blade (30) facing away from the blade surface is in contact with the side edge of the rib plate (22), and the mounting plate (32) is detachably connected to the rib plate (22).

7. A valve blade device for a pressure relief discharge valve according to claim 1, characterized in that: A secondary blade (40) is installed on a side of the main blade (30) close to the barrel (10), and the secondary blade (40) is provided with a secondary blade head (41), wherein the extension direction of the blade line of the secondary blade head (41) is opposite to the extension direction of the blade line of the main blade head (31).

8. The valve knife device for a pressure relief discharge valve according to claim 7, characterized in that: The auxiliary blade (40) is detachably connected to the main blade (30).

9. A containment vessel, characterized in that, A valve knife device for a pressure relief discharge valve comprising the valve knife device according to any one of claims 1-8.

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