Main throttle valve plugging structure

Abstract

The invention discloses a main throttle valve plugging structure, which comprises a plugging shell arranged on an air inlet pipe of a main throttle valve; the sealing part is arranged in the plugging shell; the plugging part is arranged in the plugging shell and located above the sealing part, the plugging part is matched with the sealing part so as to switch and control the gas passage state in the gas inlet pipe, and the sealing part comprises a sealing body and a plurality of rotating rods hinged to the sealing body; the sealing part further comprises a pressing ring hinged to the rotating rod, a pressing part arranged on the pressing ring and a supporting seat hinged to the middle of the rotating rod. The plugging part comprises a pressing cylinder arranged on the pressing part in a sleeving mode, and a sealing gasket sealed with the sealing body is arranged at the bottom of the pressing cylinder. And the lifting part is arranged on the plugging part and is used for driving the plugging part to lift in the sealing shell. According to the sealing structure, gap leakage caused by aging of the sealing ring at the plugging position is prevented, the sealing effect is improved, and leakage and jamming at the position of the valve rod and the lining are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of main steam valve plugging, and particularly to a main steam valve plugging structure. Background Art

[0002] The main steam valve plugging structure is a key design in a steam turbine to ensure that the main steam valve tightly blocks the steam flow in the closed state. Its core function is to prevent steam leakage and ensure the safe operation of the unit.

[0003] The prior art discloses a main steam valve plugging device for chemical cleaning of superheaters, including a main steam valve body and a high-pressure regulating valve body installed on the main steam valve body. A sealing plug plate is provided at the end of the main steam valve body, which can drive the sealing plug plate to move to achieve the purpose of plugging the main steam valve body. Through the setting of the anti-leakage unit, the phenomenon of water leakage through the bolt holes can be prevented. Through the setting of the anti-rotation component, the plugging component can be stably reinforced, making the plugging more reliable. However, there are still the following deficiencies: oxidation of the valve stem and bushing in a high-temperature environment leads to a decrease in the gap, an increase in friction, resulting in jamming, and the sealing ring is prone to aging and leakage, and the sealing effect is not good. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned deficiencies at present, and provide a main steam valve plugging structure to prevent gap leakage caused by aging of the sealing ring at the plugging location, improve the sealing effect, and avoid leakage and jamming at the valve stem and bushing.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A main steam valve plugging structure, comprising:

[0006] A plugging housing, arranged on the intake pipe of the main steam valve;

[0007] A sealing part, arranged inside the plugging housing;

[0008] A plugging part, arranged inside the plugging housing and located above the sealing part. The plugging part cooperates with the sealing part to switch and control the state of the gas passage inside the intake pipe. The sealing part includes a sealing body and a plurality of rotating rods hinged on the sealing body. The sealing part further includes a pressing ring hinged to the rotating rod and a pressing part arranged on the pressing ring, and a support seat hinged in the middle of the rotating rod;

[0009] The plugging part includes a pressing cylinder sleeved on the pressing part. A sealing gasket for sealing with the sealing body is provided at the bottom of the pressing cylinder;

[0010] A lifting part, arranged on the plugging part, used to drive the plugging part to lift and lower inside the sealing housing.

[0011] Further, it further includes a connecting rod seal, which is arranged inside the plugging housing and outside the plugging part, and the connecting rod seal is used to seal the plugging part and the plugging housing.

[0012] Further, the sealing part includes a sealing seat installed on the plugging housing through flange bolts, and the sealing body is movably connected to the sealing seat;

[0013] The sealing part further includes support seats arranged on the sealing seat and corresponding to the rotating rods one by one, and the support seats are movably connected to the ends of the rotating rods (23).

[0014] Further, the pressure ring is coaxially arranged with the sealing seat, and the pressure ring is hinged to one end of a plurality of the rotating rods.

[0015] Further, a driving element for providing power is arranged on the pressing part, and the driving element is fixedly arranged on the plugging part, and it can drive the pressing part to expand and contract along the axial path of the pressing cylinder.

[0016] Further, a pressing plate is arranged at the bottom of the pressing cylinder, a sealing gasket is arranged at the bottom of the pressing plate, and the pressing cylinder is in dynamic sealing cooperation with the cover of the plugging housing.

[0017] Further, the connecting rod seal includes a fixing plate arranged inside the plugging housing, a corrugated cylinder is arranged on the fixing plate, and the other end of the corrugated cylinder is fixedly arranged with the pressing cylinder;

[0018] The connecting rod seal further includes a guiding cylinder arranged on the fixing plate, a guide rail is arranged inside the guiding cylinder, and a sealing column for sealing the connecting rod part is arranged inside the guiding cylinder.

[0019] Further, the lifting part includes a conducting part arranged at the top of the plugging part, and a driving part for providing power to the plugging part is arranged at the end of the conducting part.

[0020] The beneficial effects of the present invention are reflected in:

[0021] In the present invention, the plugging part is driven by the lifting part to move inside the plugging housing, and the plugging part presses and seals on the sealing part to complete the plugging. When the sealing gasket on the plugging part has reduced sealing performance after being exposed to high temperature for a long time, then the driving unit on the sealing part drives the pressing part and the pressure ring to lift and lower. The pressure ring drives the rotating rods to rotate on the support seats, and the rotating rods drive the sealing body to extend out of the sealing seat, and the sealing body presses the sealing gasket to improve the sealing effect. Then, the sealing column seals with the guiding cylinder to prevent jamming, and the corrugated cylinder seals the pressing cylinder and the fixing plate to prevent leakage, realizing preventing gap leakage caused by aging of the sealing ring at the plugging place, and improving the sealing effect, and avoiding leakage and jamming at the valve stem and the bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a three-dimensional view of the present invention;

[0023] Figure 2 is a structural cross-sectional view of the present invention;

[0024] Figure 3 is a three-dimensional view of the sealing part of the present invention;

[0025] Figure 4 is a three-dimensional view of the plugging part and the connecting rod seal of the present invention;

[0026] Figure 5 is a three-dimensional cross-sectional view of the plugging part and the connecting rod seal of the present invention.

[0027] In the figure:

[0028] 1. Plugging housing;

[0029] 2. Sealing part; 21. Sealing seat; 22. Sealing body; 23. Rotating rod; 24. Support seat; 25. Pressing ring; 26. Pressing part; 27. Driving element;

[0030] 3. Plugging part; 31. Pressing cylinder; 32. Pressing plate; 33. Sealing gasket;

[0031] 4. Connecting rod seal; 41. Fixed plate; 42. Corrugated cylinder; 43. Guide cylinder; 44. Guide rail; 45. Sealing column;

[0032] 5. Lifting part;

[0033] 6. Air inlet pipe. Specific implementation manner

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] Please refer to Figures 1-5 , the present invention discloses a main steam valve plugging structure, including:

[0036] The plugging housing 1 is fixedly installed on the air inlet pipe 6 of the main steam valve, and the plugging housing 1 is installed at the end of the air inlet pipe 6 through a flange and bolts. The plugging housing 1 is used to protect the sealing part 2 and the plugging part 3. The plugging housing 1 is used to install the sealing part 2, and the plugging housing 1 is used to communicate with the air inlet pipe 6;

[0037] The sealing part 2 is fixedly installed inside the plugging housing 1 and is located near the lower half of the plugging housing 1. The sealing part 2 is fixedly installed with the plugging housing 1 through bolts. The plugging housing 1 is divided into upper and lower parts and is fixedly installed through the sealing part 2. The sealing part 2 is used to improve the sealing performance of the plugging part 3.

[0038] The plugging part 3 is movably installed inside the plugging housing 1. The plugging part 3 is located inside the plugging housing 1 to press the sealing part 2 and is located above the sealing part 2. The plugging part 3 cooperates with the sealing part 2 to switch and control the state of the gas passage inside the air inlet pipe 6. The sealing part 2 includes a sealing body 22 and a plurality of rotating rods 23 hinged on the sealing body 22. The sealing part 2 further includes a pressing ring 25 hinged to the rotating rod 23 and a pressing part 26 arranged on the pressing ring 25. The pressing part 26 is located above the pressing ring 25 and is on the same axis, and a support seat 24 hinged in the middle of the rotating rod 23. The pressing ring 25 is used to drive the rotating rod 23 to rotate around the support seat 24. Due to the rotation of the rotating rod 23 with the pressing ring 25 and the sealing body 22, the sealing body 22 rises to press and seal with the plugging part 3. The plugging part 3 extends to the outside of the plugging housing 1 and is used for movably installing with the lifting part 5.

[0039] The plugging part 3 includes a pressing cylinder 31 sleeved on the pressing part 26. A sealing gasket 33 sealed with the sealing body 22 is arranged at the bottom of the pressing cylinder 31. The pressing cylinder 31 and the sealing gasket 33 are fixedly installed through a flange and bolts. The pressing cylinder 31 is used to move on the pressing part 26, and the pressing cylinder 31 drives the sealing gasket 33 to press and seal with the sealing body 22, preventing leakage caused by the aging of the sealing gasket 33 and the sealing body 22.

[0040] The lifting part 5 is rotatably arranged on the plugging part 3. The lifting part 5 is located on one side of the plugging part 3 and is installed with the plugging housing 1 through bolts, and is used to drive the plugging part 3 to lift inside the sealing housing 1, so that the lifting part 5 drives the plugging part 3 to press and seal with the sealing part 2.

[0041] During use, the lifting part 5 drives the plugging part 3 to seal the air inlet pipe 6 and the plugging housing 1 on the sealing part 2. As the sealing part 2 rises, the sealing performance between the sealing part 2 and the plugging part 3 is further improved, realizing the prevention of gap leakage caused by the aging of the sealing ring at the plugging place, and improving the sealing effect, avoiding leakage and jamming at the valve stem and the bushing.

[0042] Such as Figure 2 、 Figure 4 and Figure 5As shown, in a specific embodiment, it further includes a connecting rod seal 4, which is fixedly installed inside the plugging housing 1. The connecting rod seal 4 is located above the connection between the sealing part 2 and the air inlet pipe 6 and the plugging housing 1, and is sleeved on the plugging part 3 to seal the plugging part 3 and prevent gas from discharging through the connection between the plugging housing 1 and the plugging part 3. The connecting rod seal 4 is used for the plugging part 3 and the plugging housing 1 to seal the upper part of the connecting rod seal 4 and the plugging housing 1 to prevent leakage and jamming.

[0043] As Figure 2 and Figure 3 As shown, in an embodiment, the sealing part 2 includes a sealing seat 21 installed on the plugging housing 1 through flange bolts, and the sealing body 22 is movably connected to the sealing seat 21. The sealing seat 21 is in a disc ring shape, and a groove adapted to the sealing body 22 is formed on the sealing seat 21 for the sealing body 22 to slide and seal inside the sealing seat 21. The side wall of the sealing body 22 is in an arc shape, and the sealing body 22 slides and seals with the sealing seat 21, and the sealing body 22 is located inside the sealing seat 21 and extends to the upper part of the sealing seat 21;

[0044] The sealing part 2 further includes support seats 24 provided on the sealing seat 21 and corresponding to the rotating rods 23 one by one. The support seats 24 are welded to the sealing seat 21, and the support seats 24 are movably connected to the ends of the rotating rods 23. The rotating rods 23 rotate on the support seats 24, and the rotating rods 23 rotate on the sealing body 22, the support seats 24 and the pressure ring 25 to drive the sealing body 22 to lift and lower, so as to improve the sealing effect when the sealing body 22 and the sealing gasket 33 are aged;

[0045] In a specific embodiment, the pressure ring 25 is coaxially arranged with the sealing seat 21, and the pressure ring 25 is hinged to one end of a plurality of rotating rods 23. The pressure ring 25 is used to press the rotating rods 23 to rotate around the support seats 24, so as to apply pressure to the pressure ring 25. The rotating rods 23 on the pressure ring 25 rotate around the support seats 24, and at the same time the rotating rods 23 rotate on the pressure ring 25 and the sealing body 22, so that the sealing body 22 moves on the sealing body 21 to make up for the gap caused by the aging of the sealing body 22 and the sealing gasket 33 and improve the sealing effect.

[0046] During use, the pressure ring 25 drives the rotating rods 23 to rotate on the support seats 24. The rotating rods 23 rotate on the pressure ring 25 and the sealing body 22, and the rotating rods 23 drive the sealing body 22 to rotate and move upward inside the sealing seat 21 to further press the sealing gasket 33.

[0047] As Figure 2 and Figure 3As shown, in one embodiment, a driving element 27 for providing power is provided on the pressing part 26. The driving element 27 is an electric push rod or a hydraulic push rod. The telescopic end of the driving element 27 is installed with the pressing part 26 through bolts and flanges, and the outer wall of the driving element 27 is installed with the top of the pressing cylinder 31 through bolts and flanges. The driving element 27 is fixedly arranged on the blocking part 3, and it can drive the pressing part 26 to expand and contract along the axial path of the pressing cylinder 31. The pressing part 26 moves up and down in the pressing cylinder 31 to drive the pressing ring 25 to move up and down.

[0048] As Figure 4 and Figure 5 As shown, in one embodiment, a pressing plate 32 is fixedly installed at the bottom of the pressing cylinder 31. A sealing gasket 33 is installed at the bottom of the pressing plate 32 through bolts. The pressing plate 32 is used to support the sealing gasket 33. The pressing cylinder 31 is in dynamic sealing fit with the cover of the blocking housing 1. The pressing cylinder 31 is used to drive the pressing plate 32 and the sealing gasket 33 to move up and down, and is pressed tightly by the sealing gasket 33 and the sealing body 22 to improve the sealing performance.

[0049] As Figure 4 and Figure 5 As shown, in a specific embodiment, the connecting rod seal 4 includes a fixing plate 41 fixedly installed in the blocking housing 1. A corrugated tube 42 is provided on the fixing plate 41, and the other end of the corrugated tube 42 is fixedly connected to the outer wall of the pressing cylinder 31. The fixing plate 41 and the corrugated tube 42 are fixedly installed. The corrugated tube 42 is made of metal. The corrugated section of the corrugated tube 42 extends. The corrugated tube 42 is used to seal the pressing cylinder 31 and the fixing plate 41 to prevent leakage. The corrugated tube 42 itself can extend or contract;

[0050] The connecting rod seal 4 further includes a guiding cylinder 43 fixedly installed on the fixing plate 41. A guide rail 44 is fixedly installed in the guiding cylinder 43. A sealing column 45 for the blocking part 3 is provided in the guiding cylinder 43. The sealing column 45 is a metal part to prevent jamming between the pressing cylinder 31 and the guiding cylinder 43. The guide rail 44 provides guidance for the pressing cylinder 31 to prevent the pressing cylinder 31 from deflecting.

[0051] As Figure 1 and Figure 2 As shown, in one embodiment, the lifting part 5 includes a transmission part hinged to the top of the blocking part 3. The end of the transmission part is hinged with a driving part that provides power to the blocking part 3. The driving part is rotationally connected to the transmission part. The driving part is an electric push rod or a hydraulic push rod after that. The transmission part is two mutually hinged transmission rods. The transmission part is rotationally arranged with the pressing cylinder 31. The driving part drives the blocking part 3 to move up and down through the transmission part to seal the sealing part 2 and the blocking part 3.

[0052] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0054] In addition, "a plurality of" means two or more.

[0055] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A main steam valve plugging structure, characterized in that, Comprising: A plugging housing (1) arranged on the intake pipe (6) of the main steam valve; A sealing part (2) arranged inside the plugging housing (1); A plugging part (3) arranged inside the plugging housing (1) and located above the sealing part (2), the plugging part (3) cooperating with the sealing part (2) to switch and control the state of the gas passage inside the intake pipe (6), the sealing part (2) including a sealing body (22) and a plurality of rotating rods (23) hinged on the sealing body (22), the sealing part (2) further including a pressing ring (25) hinged to the rotating rod (23) and a pressing part (26) arranged on the pressing ring (25), and a support seat (24) hinged in the middle of the rotating rod (23); The plugging part (3) includes a pressing cylinder (31) sleeved on the pressing part (26), and a sealing gasket (33) for sealing with the sealing body (22) is arranged at the bottom of the pressing cylinder (31); A lifting part (5) arranged on the plugging part (3) for driving the plugging part (3) to lift and lower inside the sealing housing (1).

2. The main steam valve plugging structure according to claim 1, characterized in that: It further includes a connecting rod seal (4) arranged inside the plugging housing (1) and located outside the plugging part (3), and the connecting rod seal (4) is used to seal the plugging part (3) and the plugging housing (1).

3. The main steam valve plugging structure according to claim 1, characterized in that: The sealing part (2) includes a sealing seat (21) installed on the plugging housing (1) through flange bolts, and the sealing body (22) is movably connected to the sealing seat (21); The sealing part (2) further includes support seats (24) arranged on the sealing seat (21) and corresponding to the rotating rods (23) one by one, and the support seats (24) are movably connected to the ends of the rotating rods (23).

4. The main steam valve plugging structure according to claim 1, characterized in that: The pressing ring (25) is coaxially arranged with the sealing seat (21), and the pressing ring (25) is hinged to one end of the plurality of rotating rods (23).

5. The main steam valve plugging structure according to claim 1, characterized in that: A driving element (27) for providing power is arranged on the pressing part (26), and the driving element (27) is fixedly arranged on the plugging part (3) and can drive the pressing part (26) to expand and contract along the axial path of the pressing cylinder (31).

6. The main steam valve plugging structure according to claim 1, characterized in that: A pressing plate (32) is arranged at the bottom of the pressing cylinder (31), a sealing gasket (33) is arranged at the bottom of the pressing plate (32), and the pressing cylinder (31) is in dynamic sealing cooperation with the cover of the plugging housing (1).

7. The main steam valve plugging structure according to claim 2, characterized in that: The connecting rod seal (4) includes a fixing plate (41) arranged inside the plugging housing (1), a corrugated cylinder (42) is arranged on the fixing plate (41), and the other end of the corrugated cylinder (42) is fixedly arranged with the pressing cylinder (31); The connecting rod seal (4) further includes a guiding cylinder (43) arranged on the fixing plate (41), a guide rail (44) is arranged inside the guiding cylinder (43), and a sealing column (45) for sealing the connecting rod part (3) is arranged inside the guiding cylinder (43).

8. The main steam valve plugging structure according to claim 1, characterized in that: The lifting part (5) includes a conducting part arranged at the top of the plugging part (3), and a driving part for providing power to the connecting rod part (3) is arranged at the end of the conducting part.

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