Oil control jump gate valve

Abstract

The utility model relates to a jump gate valve, in particular to an oil control jump gate valve, and aims to solve the problems that when the oil control jump gate valve is used, steam leakage is caused, the risk of steam leakage is easily caused due to the fact that a sealing surface is not tight, and a long overhaul period is needed. A piston rod of the oil cylinder assembly is fixedly connected with one end of the connecting sleeve, the connecting sleeve is sleeved with the belleville spring assembly, the connecting rod is arranged in the valve seat and fixedly connected with the connecting sleeve, the sealing ring assembly, the sealing head assembly, the sleeve assembly and the sealing seat assembly are installed in the valve body in the length direction, and the connecting rod is fixedly connected with the sealing head assembly. The graphite packing is arranged in the sealing ring assembly and located between the sealing ring assembly and the connecting rod, the sealing head assembly is arranged in the sleeve assembly and slides in the sleeve assembly, a steam exhaust hole is machined in the sleeve assembly, and the sealing head assembly abuts against the interior of a steam circulation opening of the sealing seat assembly. The utility model is applied to the field of turbines.

Description

Technical Field

[0001] The utility model relates to a trip valve, in particular to an oil-controlled trip valve. The utility model is applied to the field of steam turbines. Background Art

[0002] The oil-controlled trip valve is used in steam turbines. This oil-controlled trip valve is designed to solve the problems of steam leakage from the sealing surface of the oil-controlled trip valve and the long maintenance period. At present, during the use of the oil-controlled trip valve, due to long-term erosion by unsaturated steam, the matching surface of the valve body is corroded, resulting in a loose seal, which causes steam leakage and heat loss. In addition, the current oil-controlled trip valves all use cylindrical springs, which have torsional forces. During use, this may cause the sealing head to loosen, resulting in poor alignment between the sealing head and the valve body, resulting in a loose sealing surface and the risk of steam leakage. In addition, because the valve body of the existing oil-controlled trip valve is a single-part, non-detachable structure, the oil-controlled trip valve pipeline needs to be cut before the valve body can be repaired. After the repair, it needs to be re-welded and heat-treated, which adds a lot of workload to the maintenance and requires a long maintenance cycle. Utility Model Content

[0003] The purpose of the utility model is to solve the problem that steam leakage occurs when the oil-controlled trip valve is used, which easily causes the sealing surface to be loose and produces the risk of steam leakage, and requires a long maintenance cycle, and thus it is necessary to provide an oil-controlled trip valve.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] An oil-controlled trip valve comprises an oil cylinder assembly, a piston rod sleeve, a connecting sleeve, a disc spring assembly, a sleeve, a connecting rod, a valve seat, a sealing ring assembly, a graphite packing, a sealing head assembly, a sleeve assembly, a sealing seat assembly and a valve body;

[0006] The cylinder body, sleeve, valve seat and valve body of the cylinder assembly are connected sequentially along the length direction, the connecting sleeve and disc spring assembly are arranged in the sleeve, the piston rod of the cylinder assembly is fixedly connected to one end of the connecting sleeve, the disc spring assembly is sleeved on the connecting sleeve, one end of the disc spring assembly is pressed against the boss of the connecting sleeve, and the other end of the disc spring assembly is pressed against the end surface of the valve seat, the connecting rod is arranged in the valve seat, one end of the connecting rod is fixedly connected to the other end of the connecting sleeve, the sealing ring assembly, the sealing head assembly, the sleeve assembly and the sealing seat assembly are installed in the valve body along the length direction, the other end of the connecting rod passes through the sealing ring assembly and is fixedly connected to the sealing head assembly, the graphite packing is arranged in the sealing ring assembly and is located between the sealing ring assembly and the connecting rod, the sealing head assembly is arranged in the sleeve assembly and slides in the sleeve assembly, the sleeve assembly is processed with a steam exhaust hole, and the sealing head assembly is pressed against the steam flow port of the sealing seat assembly.

[0007] Further, it also includes anti-rotation pin, pointer, slotted head bolt and scale.

[0008] The side wall of the sleeve is provided with a through hole near one end of the oil cylinder assembly, the through hole is arranged in correspondence with the boss of the connecting sleeve, one end of the anti-rotation pin is installed on the boss of the connecting sleeve, the pointer is installed on the other end of the anti-rotation pin and arranged outside the sleeve, the scale is installed on the outer side wall of the sleeve through the slotted head bolt, and the end of the pointer is arranged close to the scale.

[0009] Further, the scale is arranged along the length direction of the sleeve.

[0010] Further, it also includes bushing, jacking sleeve and wrench ring.

[0011] The bushing, jacking sleeve and wrench ring are sleeved on the connecting rod from inside to outside, and are located in the valve seat, one end of the bushing is abutted against the end of the valve seat, one end of the jacking sleeve is threadedly connected to one end of the bushing, one end of the jacking sleeve is arranged in the sealing ring assembly, and the wrench ring is clamped and sleeved on the jacking sleeve.

[0012] Further, the piston rod of the oil cylinder assembly is provided with external threads, the two ends of the connecting sleeve are provided with internal threads, the external threads on the piston rod of the oil cylinder assembly are fixedly connected with the internal threads at one end of the connecting sleeve through threads, and one end of the connecting rod is provided with external threads.

[0013] Further, it also includes a nut, which is threadedly connected and installed on the external threads at one end of the connecting rod, and the connecting rod is locked and fixed on the connecting sleeve through the nut.

[0014] Further, it also includes a plurality of first bolts, a plurality of second bolts and a plurality of spring washers,

[0015] The cylinder body of the oil cylinder assembly is detachably connected and installed on one end of the sleeve through the plurality of second bolts and the plurality of spring washers, the other end of the sleeve is detachably connected and installed on one end of the valve seat through the plurality of first bolts, the plurality of second bolts and the plurality of spring washers, and the other end of the valve seat is detachably connected and installed on the valve body through the plurality of second bolts and the plurality of spring washers.

[0016] The beneficial effects of the utility model are as follows:

[0017] 1. Due to its material and structure, the sealing surface of the oil-controlled trip valve in existing technology is susceptible to erosion during use, causing steam leakage and reducing steam efficiency. Currently, the valve body of the oil-controlled trip valve is non-detachable, requiring the valve body to be cut from the pipeline for repair and grinding during maintenance. After repair, the valve body must be re-welded and the welds must be heat-treated, requiring a long maintenance cycle. However, the oil-controlled trip valve of the present invention utilizes the steam-erosion-resistant Stellite 6 material for its sealing surface, significantly improving the valve's erosion resistance and sealing effectiveness, thereby increasing the thermal efficiency of steam.

[0018] 2. Existing oil-controlled trip valves use cylindrical springs, which create torsional forces that can loosen the sealing head during use, leading to poor alignment between the sealing head and the valve body. The oil-controlled trip valve of the present invention, however, eliminates torsional forces through the use of a disc spring assembly, effectively resolving the problem of centering the sealing head assembly and the sealing seat assembly, and improving sealing effectiveness.

[0019] 3. In the prior art, the valve body of the oil-controlled trip valve is a single-part, non-detachable structure. During maintenance, the valve body needs to be cut off from the steam pipe and then ground for maintenance. After maintenance, it needs to be re-welded, inspected, and heat-treated, which requires a long construction period and maintenance cost. However, the oil-controlled trip valve of the utility model has a detachable valve body structure, and the valve body does not need to be cut off from the pipe during maintenance, which can effectively reduce the maintenance workload and significantly shorten the maintenance period and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front sectional view of the overall structure of the utility model.

[0021] Figure 2 This is a top view of the overall structure of this application.

[0022] Figure 3 This is a side view of the overall structure of this application. DETAILED DESCRIPTION

[0023] Specific implementation method 1: Combination Figures 1-3 This embodiment describes an oil-controlled trip valve, which includes a cylinder assembly 1, a piston rod sleeve 2, a connecting sleeve 4, a disc spring assembly 5, a sleeve 6, a connecting rod 8, a valve seat 9, a sealing ring assembly 14, a graphite packing 15, a sealing head assembly 16, a sleeve assembly 17, a sealing seat assembly 18, and a valve body 19.

[0024] The cylinder body, sleeve 6, valve seat 9 and valve body 19 of the oil cylinder assembly 1 are sequentially connected along the length direction, the connecting sleeve 4 and the disc spring assembly 5 are arranged in the sleeve 6, the piston rod of the oil cylinder assembly 1 is fixedly connected with one end of the connecting sleeve 4, the disc spring assembly 5 is sleeved on the connecting sleeve 4, one end of the disc spring assembly 5 abuts against the boss of the connecting sleeve 4, the other end of the disc spring assembly 5 abuts against the end face of the valve seat 9, the connecting rod 8 is arranged in the valve seat 9, one end of the connecting rod 8 is fixedly connected with the other end of the connecting sleeve 4, the sealing ring assembly 14, the sealing head assembly 16, the sleeve assembly 17 and the sealing seat assembly 18 are installed in the valve body 19 along the length direction, the other end of the connecting rod 8 is fixedly connected with the sealing head assembly 16 through the sealing ring assembly 14, the graphite packing 15 is arranged in the sealing ring assembly 14 and located between the sealing ring assembly 14 and the connecting rod 8, the sealing head assembly 16 is arranged in the sleeve assembly 17 and slides in the sleeve assembly 17, the sleeve assembly 17 is processed with steam exhaust holes, and the sealing head assembly 16 abuts against the steam body flow passage of the sealing seat assembly 18.

[0025] In the embodiment, the sealing head assembly 16 and the sealing seat assembly 18 are stacked with Stellite 6 material which is resistant to steam blow erosion on the matching contact surface, so that the anti-blowing erosion ability of the sealing surface can be effectively improved, and the sealing performance and service life of the valve are ensured. The disc spring assembly 5 can eliminate the torsional force of the valve, so that the centering problem of the sealing head assembly 16 and the sealing seat assembly 18 is effectively solved, and the sealing effect is improved. The valve body is designed as a combined type of detachable structure, which is composed of the sealing seat assembly 18 and the valve body 19. The sealing seat assembly 18 can be detached from the valve body 19. During maintenance, the sealing seat assembly is repaired or replaced without cutting off the pipeline, so that the maintenance cycle and cost are reduced.

[0026] Specific implementation method two: combining Figures 1-2 In the embodiment, the oil control trip valve also includes an anti-rotation pin 3, a pointer 22, a slotted head bolt 23 and a scale 24.

[0027] A through hole is processed on the side wall of the sleeve 6 close to one end of the oil cylinder assembly 1, the through hole is arranged corresponding to the boss of the connecting sleeve 4, one end of the anti-rotation pin 3 is installed on the boss of the connecting sleeve 4, the pointer 22 is installed on the other end of the anti-rotation pin 3 and arranged outside the sleeve 6, the scale 24 is installed on the outer side wall of the sleeve 6 through the slotted head bolt 23, and the end of the pointer 22 is arranged close to the scale 24. Other methods are the same as those in the specific implementation method one.

[0028] Specific implementation method three: combining Figures 1-2 In the embodiment, the scale of the scale 24 is arranged along the length direction of the sleeve 6. Other methods are the same as those in the specific implementation method one.

[0029] Specific implementation method four: combiningFigure 1 The oil control trip valve of the embodiment further comprises a bushing 11, a jacking sleeve 12 and a wrench ring 13.

[0030] The bushing 11, the jacking sleeve 12 and the wrench ring 13 are sleeved on the connecting rod 8 from inside to outside, and are located in the valve seat 9. One end of the bushing 11 is abutted against one end of the valve seat 9, one end of the jacking sleeve 12 is threadedly connected to one end of the bushing 11, one end of the jacking sleeve 12 is arranged in the sealing ring assembly 14, and the wrench ring 13 is sleeved on the jacking sleeve 12. The other methods are the same as those in the first embodiment.

[0031] Embodiment five: combination Figure 1 The oil control trip valve of the embodiment further comprises a bushing 11, a jacking sleeve 12 and a wrench ring 13.

[0032] Embodiment six: combination Figure 1 The oil control trip valve of the embodiment further comprises a bushing 11, a jacking sleeve 12 and a wrench ring 13.

[0033] Embodiment seven: combination Figures 1-3 The oil control trip valve of the embodiment further comprises a bushing 11, a jacking sleeve 12 and a wrench ring 13.

[0034] The cylinder body of the oil cylinder assembly 1 is detachably connected and installed on one end of the sleeve 6 through the plurality of second bolts 20 and the plurality of spring washers 21. The other end of the sleeve 6 is detachably connected and installed on one end of the valve seat 9 through the plurality of first bolts 10, the plurality of second bolts 20 and the plurality of spring washers 21. The other end of the valve seat 9 is detachably connected and installed on the valve body 19 through the plurality of second bolts 20 and the plurality of spring washers 21. The other methods are the same as those in the first embodiment.

[0035] Working principle

[0036] First, the oil cylinder assembly 1 and the piston rod sleeve 2 are connected, and then the sleeve 6 is connected with the bolt 20, spring washer 21, the connecting rod 8 is connected to the adjusting column 4 to the specified size position, locked with the nut 7, and then the connecting rod assembly is connected with the disc spring assembly 5 in the sleeve 6, the anti-rotation pin 3 is installed, and the sleeve 6 is fastened and connected with the valve seat 9 by using the bolt 10, bolt 20, spring washer 21. Then the bushing 11, jacking sleeve 12, wrench ring 13, graphite packing 15, seal ring assembly 14, seal head assembly 16, sleeve assembly 17, seal seat assembly 18 are installed in sequence, the valve seat 9 and the valve body 19 are connected and fastened by using the bolt 20, spring washer 21, then the scale 24 is installed on the sleeve, the pointer 22 is installed on the anti-rotation pin 3, and finally the graphite packing 15 is locked by tightening the wrench ring 13, and the installation is completed.

[0037] The installed oil control trip valve is welded to the steam pipeline of the condenser of the steam turbine main steam valve. After the steam turbine is hung, the AST safety oil pressure is established, the main steam valve is fully opened under the action of the oil motor, the high-pressure oil of the main steam valve oil motor is connected to the oil inlet of the oil control trip valve oil cylinder assembly 1, the oil cylinder assembly 1 is opened under the action of high-pressure oil, the oil cylinder piston rod pushes the connecting sleeve 4 to overcome the spring force of the disc spring assembly 5, the connecting sleeve 4 drives the connecting rod 8, and then pushes the seal head assembly 16, so that the seal head assembly 16 is in close contact with the seal seat assembly 18, cutting off the exhaust steam from the main valve steam valve to the condenser, so that the oil control trip valve remains closed during the main steam valve remains fully open to maintain the main steam valve shaft end pressure and prevent steam leakage.

[0038] When the steam turbine is tripped, the high-pressure oil of the oil cylinder assembly 1 is connected to the pressureless oil pipeline through the unloading valve of the main steam valve oil motor, the spring force of the disc spring assembly 5 acts on the connecting sleeve 4, and then acts on the oil cylinder assembly 1, and the oil cylinder is quickly closed. At the same time, the connecting sleeve 4 drives the connecting rod 8 to make the seal head assembly 16 quickly act and separate from the seal seat assembly 18, the steam of the shaft end pressure of the main steam valve is discharged into the condenser pipeline through the exhaust hole of the sleeve assembly 17, the shaft end pressure is reduced, and under the action of the operating seat in the main steam valve actuator, the main steam valve is quickly closed.

[0039] During the maintenance of the oil control trip valve, the valve seat 9 and the valve body 18 are separated, the seal head assembly and the seal seat assembly are removed, the sealing surface is ground, all the sealing rings are replaced, and then the valve is reassembled.

[0040] The above specific implementation can be adjusted in different ways by those skilled in the art without departing from the principles and purposes of the utility model, the protection scope of the utility model is subject to the claims and is not limited by the above specific implementation, and each implementation scheme within the scope is subject to the utility model.

Claims

1. An oil-controlled trip valve, characterized in that: It comprises an oil cylinder assembly (1), a piston rod sleeve (2), a connecting sleeve (4), a disc spring assembly (5), a sleeve (6), a connecting rod (8), a valve seat (9), a sealing ring assembly (14), a graphite packing (15), a sealing head assembly (16), a sleeve assembly (17), a sealing seat assembly (18) and a valve body (19); The cylinder body, sleeve (6), valve seat (9) and valve body (19) of the oil cylinder assembly (1) are connected in sequence along the length direction. The connecting sleeve (4) and the disc spring assembly (5) are arranged in the sleeve (6). The piston rod of the oil cylinder assembly (1) is fixedly connected to one end of the connecting sleeve (4). The disc spring assembly (5) is sleeved on the connecting sleeve (4). One end of the disc spring assembly (5) is pressed against the boss of the connecting sleeve (4). The other end of the disc spring assembly (5) is pressed against the end surface of the valve seat (9). The connecting rod (8) is arranged in the valve seat (9). One end of the connecting rod (8) is fixedly connected to the other end of the connecting sleeve (4). The sealing ring assembly (14), a sealing head assembly (16), a sleeve assembly (17) and a sealing seat assembly (18) are installed in the valve body (19) along the length direction. The other end of the connecting rod (8) passes through the sealing ring assembly (14) and is fixedly connected to the sealing head assembly (16). The graphite packing (15) is arranged in the sealing ring assembly (14) and is located between the sealing ring assembly (14) and the connecting rod (8). The sealing head assembly (16) is arranged in the sleeve assembly (17) and slides in the sleeve assembly (17). A steam exhaust hole is processed on the sleeve assembly (17). The sealing head assembly (16) is pressed against the steam flow port of the sealing seat assembly (18).

2. The oil-controlled trip valve according to claim 1, characterized in that: It also includes an anti-rotation pin (3), a pointer (22), a slotted pan head bolt (23) and a ruler (24); A through hole is machined on the side wall of the sleeve (6) near one end of the oil cylinder assembly (1), and the through hole is arranged corresponding to the boss of the connecting sleeve (4). One end of the anti-rotation pin (3) is mounted on the boss of the connecting sleeve (4), and the pointer (22) is mounted on the other end of the anti-rotation pin (3) and arranged outside the sleeve (6). The scale (24) is mounted on the outer wall of the sleeve (6) through a slotted pan head bolt (23), and the end of the pointer (22) is arranged close to the scale (24).

3. The oil-controlled trip valve according to claim 2, characterized in that: The scale of the ruler (24) is arranged along the length direction of the sleeve (6).

4. The oil-controlled trip valve according to claim 1, characterized in that: It also includes a bushing (11), a lifting sleeve (12) and a spanner ring (13); The bushing (11), the lifting sleeve (12) and the spanner ring (13) are arranged on the connecting rod (8) from the inside to the outside, and the bushing (11), the lifting sleeve (12) and the spanner ring (13) are located in the valve seat (9), one end of the bushing (11) is pressed against the end of the valve seat (9), one end of the lifting sleeve (12) is threadedly connected to one end of the bushing (11), one end of the lifting sleeve (12) is arranged in the sealing ring assembly (14), and the spanner ring (13) is clamped and sleeved on the lifting sleeve (12).

5. The oil-controlled trip valve according to claim 1, characterized in that: The piston rod of the oil cylinder assembly (1) is processed with an external thread, and both ends of the connecting sleeve (4) are respectively processed with internal threads. The external thread on the piston rod of the oil cylinder assembly (1) and the internal thread at one end of the connecting sleeve (4) are fixed by thread connection. One end of the connecting rod (8) is processed with an external thread, and the external thread at one end of the connecting rod (8) is fixed by thread connection with the internal thread at the other end of the connecting sleeve (4).

6. The oil-controlled trip valve according to claim 1, characterized in that: It also includes a nut (7) which is threadedly connected to the external thread at one end of a connecting rod (8), and the connecting rod (8) is locked and fixed on the connecting sleeve (4) through the nut (7).

7. The oil-controlled trip valve according to claim 1, characterized in that: It also includes a plurality of first bolts (10), a plurality of second bolts (20) and a plurality of spring washers (21), The cylinder body of the oil cylinder assembly (1) is detachably connected and mounted on one end of a sleeve (6) through a plurality of second bolts (20) and a plurality of spring washers (21); the other end of the sleeve (6) is detachably connected and mounted on one end of a valve seat (9) through a plurality of first bolts (10), a plurality of second bolts (20) and a plurality of spring washers (21); and the other end of the valve seat (9) is detachably connected and mounted on a valve body (19) through a plurality of second bolts (20) and a plurality of spring washers (21).

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