Pressing tool for valve seat of bypass valve of steam turbine

Abstract

The utility model discloses a pressing tool for a bypass valve seat of a steam turbine, which relates to the technical field of valve manufacturing and comprises a valve seat body, a pressing cover plate is arranged above the valve seat body, a jack is mounted on the lower side of the pressing cover plate, a pull rod is fixedly connected to the output end of the jack, and a clamping groove is formed in the lower side of the pull rod. A plurality of supporting pipes are arranged between the valve seat body and the pressing cover plate, supporting rods are slidably connected to the interiors of the supporting pipes and connected with the pressing cover plate, a hydraulic pipe is installed on one side of each supporting pipe, a movable plug is slidably connected to the interior of each hydraulic pipe, and the movable plugs are connected with the pressing cover plate. A pressing rod is fixedly connected to the upper side of the movable plug, a plurality of supporting pipes are installed on the valve seat body, and the supporting pipes play a supporting role on the pressing cover plate, so that the effect of installing and supporting a jack is achieved, and through the arrangement, the situation that the threaded rod is damaged when the pressure borne by the threaded rod is too large can be avoided; therefore, the service life of the pressing tool is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valve manufacturing, in particular to a pressing tool for a valve seat of a steam turbine bypass valve. Background Art

[0002] At present, the mainstream domestic turbine bypass valve has a self-sealing structure for the valve body and valve cover because the steam pressure and temperature are very high. The valve seat cannot be pressed against the valve body through the valve cover flange, and the valve seat can only be fixed to the valve body through the valve seat pressure ring, which makes the disassembly and assembly of the valve seat inconvenient.

[0003] In the prior art, a Chinese patent discloses a turbine bypass valve seat clamping tool (CN115781567A). This patented technology can meet the conditions of high resistance and uneven force during rotation by applying pre-pressure to the valve seat fastening device, reducing wear problems during the actual assembly process. The valve seat is pressed in advance by external force, so that the valve seat clamping ring can rotate better and achieve the purpose of tightening.

[0004] However, in the aforementioned application, the fully threaded stud supports the jack via the valve seat compression cover. During use, the jack applies pressure to the fully threaded stud via the valve seat compression cover. Excessive pressure can cause the threads on the fully threaded stud to break, rendering the jack ineffective. Therefore, a compression fixture for a steam turbine bypass valve seat is provided to address the issues raised in the aforementioned background technology. Utility Model Content

[0005] The purpose of the utility model is to provide a pressing tool for a valve seat of a steam turbine bypass valve, so as to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A clamping tool for a turbine bypass valve seat, comprising a valve seat body, a clamping cover plate provided above the valve seat body, a jack installed on the lower side of the clamping cover plate, a pull rod fixedly connected to the output end of the jack, a plurality of support tubes provided between the valve seat body and the clamping cover plate, a support rod slidably connected to the interior of the support tube, the support rod being connected to the clamping cover plate, a hydraulic tube installed on one side of the plurality of support tubes, a movable plug slidably connected to the interior of the hydraulic tube, a pressing rod fixedly connected to the upper side of the movable plug, hydraulic oil provided inside the hydraulic tube and the support tube, an oil return pipe and an oil inlet pipe fixedly and through-connected between the hydraulic tube and the support tube respectively.

[0008] As a further solution of the present invention: wherein, a spiral sleeve is installed inside the valve seat body, a connecting block and a support plate are installed on the lower side of the pull rod, and the support plate is connected to the spiral sleeve.

[0009] As a further solution of the present invention: wherein, a plurality of spiral rods are spirally connected between the connecting block and the supporting plate, and nuts are sleeved on both ends of the spiral rods.

[0010] As a further solution of the present invention: wherein, a connecting groove is provided on the connecting block, a buffer plate is slidably connected to the inside of the connecting groove, the pull rod passes through the connecting block and is fixedly connected to the buffer plate, and a buffer spring is sleeved on the pull rod.

[0011] As a further solution of the present invention: wherein, a buffer pad is fixedly connected to the upper side of the support rod, and a threaded rod is connected between the clamping cover plate and the support rod.

[0012] As a further solution of the present invention: wherein, a movable cavity is opened inside the movable plug, and the movable cavity and the inside of the oil inlet pipe are both fixedly connected with a blocking block through a fixing spring.

[0013] As a further solution of the present invention: wherein, a valve is installed inside the oil return pipe, and the oil return pipe is located above the oil inlet pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] By installing multiple support tubes on the valve seat body, and supporting the clamping cover plate through the support tubes, the jack is provided with installation support. This arrangement can avoid damage to the threaded rod when the pressure on the threaded rod is too great, thereby increasing the service life of the clamping tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the valve seat body structure in the utility model;

[0018] Figure 3 for Figure 2 A magnified schematic diagram of the structure in the middle;

[0019] Figure 4 This is a schematic cross-sectional view of the hydraulic pipe structure in the present utility model;

[0020] The corresponding relationship between the labels and component names in the figures is as follows:

[0021] 1. Valve seat body; 101. Spiral sleeve; 2. Hydraulic pipe; 201. Movable plug; 202. Movable chamber; 203. Blocking block; 204. Pressing rod; 205. Oil return pipe; 206. Valve; 207. Support rod; 208. Oil inlet pipe; 210. Support pipe; 3. Jack; 4. Holding cover plate; 5. Pull rod; 501. Support plate; 502. Spiral rod; 503. Nut; 504. Connecting block; 505. Connecting groove; 506. Buffer spring; 507. Buffer plate. DETAILED DESCRIPTION

[0022] See also Figures 1 to 4 : A clamping tool for a turbine bypass valve seat, comprising a valve seat body 1, a clamping cover plate 4 is arranged above the valve seat body 1, a jack 3 is installed on the lower side of the clamping cover plate 4, a pull rod 5 is fixedly connected to the output end of the jack 3, a plurality of support tubes 210 are arranged between the valve seat body 1 and the clamping cover plate 4, a support rod 207 is slidably connected inside the support tube 210, the support rod 207 is connected to the clamping cover plate 4, a hydraulic tube 2 is installed on one side of the plurality of support tubes 210, a movable plug 201 is slidably connected inside the hydraulic tube 2, a pressing rod 204 is fixedly connected to the upper side of the movable plug 201, hydraulic oil is provided inside the hydraulic tube 2 and the support tube 210, and an oil return pipe 205 and an oil inlet pipe 208 are fixed and connected between the hydraulic tube 2 and the support tube 210 respectively.

[0023] Among them, multiple support tubes 210 are installed on the valve seat body 1, and the support tubes 210 support the clamping cover plate 4, thereby providing installation support for the jack 3. This arrangement can avoid damage to the threaded rod when the pressure on the threaded rod is too large, thereby increasing the service life of the clamping tooling.

[0024] Preferably, a spiral sleeve 101 is installed inside the valve seat body 1 , and a connecting block 504 and a support plate 501 are installed on the lower side of the pull rod 5 , and the support plate 501 is connected to the spiral sleeve 101 .

[0025] The support plate 501 supports and stretches the entire spiral sleeve 101 , thereby fixing the position of the spiral sleeve 101 inside the valve seat body 1 .

[0026] Preferably, a plurality of spiral rods 502 are spirally connected between the connecting block 504 and the supporting plate 501 , and nuts 503 are sleeved on both ends of the spiral rods 502 .

[0027] Among them, the connecting block 504 and the supporting plate 501 are connected by multiple spiral rods 502, and the multiple spiral rods 502 are arranged in a circular shape. Compared with the comparative documents, the multiple spiral rods 502 can share the pulling force, avoiding the loosening between the connecting block 504 and the supporting plate 501 caused by the breakage of the spiral rods 502.

[0028] Preferably, a connecting groove 505 is provided on the connecting block 504 , a buffer plate 507 is slidably connected inside the connecting groove 505 , the pull rod 5 passes through the connecting block 504 and is fixedly connected to the buffer plate 507 , and a buffer spring 506 is sleeved on the pull rod 5 .

[0029] The buffer spring 506 has a buffering effect on the pull rod 5, thereby preventing the pull rod 5 from being subjected to excessive tension, which would cause the connection between the connecting block 504 and the pull rod 5 to become loose.

[0030] Preferably, a buffer pad is fixedly connected to the upper side of the support rod 207, and a threaded rod is connected between the compression cover plate 4 and the support rod 207.

[0031] The buffer pad is provided to facilitate the connection between the pressing cover plate 4 and the support rod 207 , thereby preventing the vibration force generated by the jack 3 during operation from being transmitted to the support rod 207 .

[0032] Preferably, a movable cavity 202 is provided inside the movable plug 201 , and a blocking block 203 is fixedly connected to the movable cavity 202 and the inside of the oil inlet pipe 208 via a fixing spring.

[0033] When the pressing rod 204 moves downward, the hydraulic oil in the hydraulic pipe 2 is forced into the support pipe 210 through the oil inlet pipe 208. When the amount of oil in the support pipe 210 increases, the height of the support rod 207 is increased. When the pressing rod 204 moves upward, the blocking block 203 inside the movable plug 201 is affected by the hydraulic oil pressure on the upper part of the movable plug 201, and the blocking block 203 moves downward, so that the hydraulic oil on the upper side of the movable plug 201 enters the lower side of the movable plug 201 through the movable chamber 202, so that there is always hydraulic oil under the movable plug 201, and when the movable plug 201 moves downward, the blocking block 203 is affected by the hydraulic oil pressure under the movable plug 201, and the blocking block 203 blocks the movable chamber 202, so that the hydraulic oil under the movable plug 201 cannot enter the upper part of the movable plug 201.

[0034] Preferably, a valve 206 is installed inside the oil return pipe 205 , and the oil return pipe 205 is located above the oil inlet pipe 208 .

[0035] Among them, when the height of the support rod 207 needs to be lowered, the valve 206 can be opened, and then pressure can be applied to the support rod 207. The support rod 207 will cause the hydraulic oil inside the support tube 210 to return to the inside of the hydraulic tube 2 through the return oil pipe 205, thereby lowering the height of the support rod 207.

[0036] Working principle: A plurality of support tubes 210 are installed on the valve seat body 1, and the support tubes 210 support the pressing cover plate 4, thereby supporting the jack 3. Such an arrangement can avoid damage to the threaded rod when the pressure on the threaded rod is too large, thereby improving the service life of the pressing tool. When it is necessary to adjust the height of the support rod 207 inside the support tube 210, the pressing rod 204 can be moved back and forth. When the pressing rod 204 moves downward, the hydraulic oil inside the hydraulic pipe 2 will be pressed into the support pipe 210 through the oil inlet pipe 208. When the amount of oil inside the support tube 210 increases, the height of the support rod 207 will be increased. When the pressing rod 204 moves upward, the blocking block 203 inside the movable plug 201 is opened. Affected by the hydraulic oil pressure on the upper part of the movable plug 201, the blocking block 203 will move downward, so that the hydraulic oil on the upper side of the movable plug 201 enters the lower side of the movable plug 201 through the movable chamber 202, so that there is always hydraulic oil under the movable plug 201, and when the movable plug 201 moves downward, the blocking block 203 is affected by the hydraulic oil pressure below the movable plug 201, and the blocking block 203 blocks the movable chamber 202, so that the hydraulic oil under the movable plug 201 cannot enter the upper part of the movable plug 201. When the height of the support rod 207 needs to be lowered, the valve 206 can be opened and then pressure can be applied to the support rod 207. The support rod 207 will cause the hydraulic oil inside the support pipe 210 to return to the inside of the hydraulic pipe 2 through the return oil pipe 205, thereby lowering the height of the support rod 207.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressing tool for a valve seat of a steam turbine bypass valve, comprising a valve seat body (1), characterized in that: A clamping cover plate (4) is provided above the valve seat body (1), a jack (3) is installed on the lower side of the clamping cover plate (4), and a pull rod (5) is fixedly connected to the output end of the jack (3). A plurality of support tubes (210) are provided between the valve seat body (1) and the clamping cover plate (4), and a support rod (207) is slidably connected inside the support tube (210), and the support rod (207) is connected to the clamping cover plate (4). A hydraulic tube (2) is installed on one side of the plurality of support tubes (210), and a movable plug (201) is slidably connected inside the hydraulic tube (2), and a pressing rod (204) is fixedly connected to the upper side of the movable plug (201). Hydraulic oil is provided inside the hydraulic tube (2) and the support tube (210), and an oil return tube (205) and an oil inlet tube (208) are fixedly and through-connected between the hydraulic tube (2) and the support tube (210).

2. The pressing tool for the valve seat of a steam turbine bypass valve according to claim 1, characterized in that: A spiral sleeve (101) is installed inside the valve seat body (1), and a connecting block (504) and a support plate (501) are installed on the lower side of the pull rod (5), and the support plate (501) is connected to the spiral sleeve (101).

3. The pressing tool for the valve seat of a steam turbine bypass valve according to claim 2, characterized in that: A plurality of spiral rods (502) are spirally connected between the connecting block (504) and the supporting plate (501), and nuts (503) are sleeved on both ends of the spiral rods (502).

4. The pressing tool for the valve seat of a steam turbine bypass valve according to claim 3, characterized in that: The connecting block (504) is provided with a connecting groove (505), the interior of the connecting groove (505) is slidably connected to a buffer plate (507), the pull rod (5) passes through the connecting block (504) and is fixedly connected to the buffer plate (507), and a buffer spring (506) is sleeved on the pull rod (5).

5. The pressing tool for a valve seat of a steam turbine bypass valve according to claim 1, characterized in that: A buffer pad is fixedly connected to the upper side of the support rod (207), and a threaded rod is connected between the pressing cover plate (4) and the support rod (207).

6. The pressing tool for a valve seat of a steam turbine bypass valve according to claim 1, characterized in that: A movable cavity (202) is provided inside the movable plug (201), and a blocking block (203) is fixedly connected to the movable cavity (202) and the inside of the oil inlet pipe (208) via a fixing spring.

7. The pressing tool for a valve seat of a steam turbine bypass valve according to claim 1, characterized in that: A valve (206) is installed inside the oil return pipe (205), and the oil return pipe (205) is located above the oil inlet pipe (208).

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