Water inlet butterfly valve closing anti-misopening device

Abstract

The utility model discloses a kind of water inlet butterfly valve closing after preventing false opening device, it is related to the water inlet butterfly valve technical field of hydropower station, including valve body, drive air stem and false opening prevention mechanism, the false opening prevention mechanism includes sleeve, limiting locking nut, support column, servomotor and installation assembly, internal thread is opened on the sleeve inner wall, limiting locking nut outer wall is equipped with external thread, the internal thread is matched with the external thread, limiting locking nut is connected with sleeve thread by external thread and internal thread, the support column is fixedly installed in limiting locking nut, the upper end of the support column is located at the lower end of servomotor side, the utility model device can be reliably limited self-loosening after installation, fundamentally prevent butterfly valve from self-opening after closing, can effectively resist operating force under 16Mpa pressure, whether face water pressure effect or artificial misoperation, butterfly valve false opening can be reliably prevented, guarantee maintenance personnel safety.

Description

Technical Field

[0001] This utility model relates to the technical field of inlet butterfly valves for hydropower stations, specifically a device to prevent accidental opening of the inlet butterfly valve after it is closed. Background Technology

[0002] The inlet butterfly valve is an important piece of equipment in hydropower stations. It is mainly used to shut off the water supply by closing the forebay water pressure, to urgently shut off the water supply in case of an accident, and to close the inlet butterfly valve during maintenance so that personnel can enter the flow channel to inspect the turbine generator unit. The inlet butterfly valve uses a hydraulic operating mechanism. The valve diameter is 2.4 meters, and the design pressure is 1.6 MPa. The valve is hydraulically operated with an oil pressure of 16 MPa. The valve has a locking mechanism after closing, which is hydraulically operated. The valve has a seat. During maintenance, after the valve is closed and locked, the hydraulic oil is depressurized to prevent accidental operation. However, the locking hole has a certain gap (total gap is about 10 mm). Under the pressure of the forebay water, the valve plate may open to a certain degree. If the hydraulic oil is not depressurized, mechanical problems such as aging of the relay chamber seal or human error could also cause the valve to open.

[0003] Currently, most devices use a counterweight on the other side of the butterfly valve or ball valve servo. After the butterfly valve is closed, the counterweight applies a force greater than the water pressure in the closing direction to prevent the water pressure from forcing it open. By adding a counterweight to the other side of the butterfly valve, it is possible to open the valve under water pressure after it is closed, but this cannot prevent human error, and the structure is costly and takes up a lot of space. Alternatively, a mechanical locking device can be added at the hydraulic locking point. However, if a person misoperates, the mechanical locking rod can easily shear the locking screw under the operating pressure of 16 MPa, which still cannot prevent misoperation. Utility Model Content

[0004] The purpose of this invention is to provide a device to prevent accidental opening of the inlet butterfly valve after it is closed, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a device to prevent accidental opening after the inlet butterfly valve is closed, comprising a valve body, a drive rod, and an anti-accidental opening mechanism. The anti-accidental opening mechanism includes a sleeve, a limit locking nut, a support column, a relay, and an installation assembly. The inner wall of the sleeve is provided with an internal thread, and the outer wall of the limit locking nut is provided with an external thread. The internal thread matches the external thread. The limit locking nut is threadedly connected to the sleeve through the external and internal threads. The support column is fixedly installed inside the limit locking nut. The upper end of the support column is located at the lower end of one side of the relay and is in close contact with the relay.

[0006] In a preferred embodiment, two symmetrically distributed grooves are formed on the two side walls of the support column.

[0007] In a preferred embodiment, the upper end of the output shaft of the drive rod is hinged to one side of the relay.

[0008] In a preferred embodiment: the top of the support column is fitted with an anti-slip block, the anti-slip block has a T-shaped cross-sectional structure, and the anti-slip block is made of anti-slip rubber.

[0009] In a preferred embodiment: the mounting assembly includes a steel plate, a base, and a reinforcing member; the lower end of the sleeve is welded to the steel plate; the steel plate is mounted on the base by fasteners; the lower end of the base is welded with a reinforcing member; and both the base and the reinforcing member are embedded in cement.

[0010] In a preferred embodiment: the reinforcement is J-shaped, and there are four reinforcements in total, which are symmetrically distributed.

[0011] In a preferred embodiment: the fastener is a reinforcing bolt, and threaded holes are provided on the walls of the four corners of the base and the steel plate, and the threaded holes provided on the base and the steel plate are threadedly connected to the reinforcing bolt.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are: This invention, through the setting of an anti-misoperation mechanism, uses a support column on the lower end of the relay on the butterfly valve to reliably limit the butterfly valve from self-opening under forebay water pressure or accidental opening by personnel. Compared with the existing counterweight structure, it saves cost and space, and has higher reliability, effectively preventing accidental opening by personnel. Compared with adding a mechanical lock, it avoids the defect of the additional mechanical lock device being easily sheared in case of accidental operation. This device can effectively resist the operating force under 16Mpa pressure. Whether facing water pressure or human error, it can reliably prevent the butterfly valve from opening accidentally, ensuring the safety of maintenance personnel. Moreover, this device is mainly composed of simple components such as a sleeve, limit locking nut, support column, relay, and installation components. The structure is simple, the manufacturing cost is low, and it is suitable for the compact equipment layout environment inside the hydropower station, making it easy to install and arrange. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the fully closed butterfly valve structure of this utility model; Figure 2 This is a schematic diagram of the fully open structure of the butterfly valve of this utility model; Figure 3 This is a schematic diagram of the anti-accidental opening mechanism of this utility model; Figure 4 This is a cross-sectional schematic diagram of a portion of the anti-accidental opening mechanism of this utility model; Figure 5 This is a schematic diagram of the structure of the reinforcing component of this utility model embedded in cement; In the diagram: 1. Valve body; 2. Drive rod; 3. Sleeve; 4. Limit lock nut; 5. Support column; 6. Relay device; 7. Groove; 8. Threaded hole; 9. Anti-slip block; 10. Steel plate; 11. Base; 12. Reinforcing member; 13. Fastener; 14. Cement. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figures 1-5 This utility model provides a technical solution: a device to prevent accidental opening after the inlet butterfly valve is closed, including a valve body 1, a drive rod 2, and an anti-accidental opening mechanism. The anti-accidental opening mechanism includes a sleeve 3, a limit locking nut 4, a support column 5, a relay 6, and an installation assembly. The inner wall of the sleeve 3 is provided with an internal thread, and the outer wall of the limit locking nut 4 is provided with an external thread. The internal thread and the external thread are matched. The limit locking nut 4 is threadedly connected to the sleeve 3 through the external thread and the internal thread. The support column 5 is fixedly installed inside the limit locking nut 4 to reliably prevent the support column 5 from loosening. The upper end of the support column 5 is located at the lower end of one side of the relay 6 and is in close contact with the relay 6.

[0016] When it is necessary to close the butterfly valve and prevent it from being opened accidentally, operate the drive rod 2 to rotate the relay 6 counterclockwise to close the butterfly valve. Then, the operator holds the special open wrench inserted in the groove 7 and rotates the support column 5 counterclockwise, which drives the support column 5 and the limit locking nut 4 to rotate together. Since the limit locking nut 4 is connected to the sleeve 3 by threads, the limit locking nut 4 will move upward along the inner wall of the sleeve 3 during the rotation, thereby driving the support column 5 to rise until the anti-slip block 9 at the top of the support column 5 is pressed against the lower end of the relay 6. At this time, stop rotating. The support column 5 forms a support limit for the relay 6, restricting the rotation of the relay 6. Even if the operator accidentally operates the relay 6, it cannot be rotated, thereby preventing the butterfly valve from opening under water pressure or human error. When the butterfly valve needs to be opened, the operator only needs to turn the special wrench inserted into the groove 7 counterclockwise. Similarly, this will cause the support column 5 and the limit locking nut 4 to move downward, so that the anti-slip block 9 is separated from the relay 6, releasing the limit on the drive air rod 2. Then the butterfly valve can be opened normally by turning the relay 6 clockwise.

[0017] Two symmetrically distributed grooves 7 are provided on the two side walls of the support column 5. The support column 5 and the limit locking nut 4 can be rotated by a special wrench through the grooves 7. The support column 5 can be raised and lowered by the threaded engagement between the limit locking nut 4 and the sleeve 3, so as to adjust the contact state between the support column 5 and the relay 6. The operation is convenient.

[0018] The upper end of the output shaft of the drive rod 2 is hinged to one side of the servo motor 6.

[0019] The top of the support column 5 is fitted with an anti-slip block 9. The anti-slip block 9 has a T-shaped cross-sectional structure and is made of anti-slip rubber. The anti-slip rubber material has good anti-slip performance and can effectively increase the friction between the top of the support column 5 and the relay 6, preventing relative sliding between the two and thus enhancing the anti-accidental opening effect. The T-shaped cross-sectional structure of the anti-slip block 9 can better fit the top of the support column 5, preventing the anti-slip block 9 from falling off during use. In addition, the extended part at the lower end of the T-shaped anti-slip block 9 increases the force point, making it convenient to disassemble and assemble the anti-slip block 9.

[0020] The mounting components include a steel plate 10, a base 11, and a reinforcing member 12. The lower end of the sleeve 3 is welded to the steel plate 10. The steel plate 10 is mounted on the base 11 by fasteners 13. The fasteners 13 facilitate the disassembly and maintenance of the device. The lower end of the base 11 is welded with a reinforcing member 12. Both the base 11 and the reinforcing member 12 are embedded in cement 14. Embedding the base 11 and the reinforcing member 12 in cement 14 enables the device to be tightly integrated with the foundation structure of the hydropower station, greatly improving the overall stability of the device and preventing the device from shifting when subjected to external forces. During device maintenance, if it is necessary to inspect or replace parts of the anti-misoperation opening mechanism, first unscrew the reinforcing bolts to separate the steel plate 10 from the base 11, and then remove the sleeve 3, limit locking nut 4, support column 5 and other parts to carry out maintenance operations. After maintenance is completed, the device can be reinstalled and fixed in the reverse order.

[0021] The reinforcement 12 is J-shaped, and there are four reinforcements 12 in total, which are symmetrically distributed. When the J-shaped reinforcement 12 is embedded in the cement 14, its hook part can form a more reliable anchoring effect with the cement 14, which enhances the connection strength between the base 11 and the cement 14 foundation. The two symmetrically distributed reinforcements 12 can make the base 11 bear the force evenly, further improve the stability of the device, and avoid the base 11 from deforming or loosening due to excessive force on one side.

[0022] Fastener 13 is a reinforcing bolt. Threaded holes 8 are provided on the walls of the base 11 and the steel plate 10 at all four corners. The threaded holes 8 on the base 11 and the steel plate 10 are threadedly connected to the reinforcing bolts. The reinforcing bolts at the four corners of the base 11 and the steel plate 10 can fix the steel plate 10 and the base 11 from multiple directions, ensuring the tightness and stability of the connection between the two, preventing the steel plate 10 from shaking during use, and thus ensuring the normal operation of the anti-misoperation mechanism.

[0023] Finally, it should be noted that: all parts not described in this utility model are the same as or can be implemented using existing technology. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for preventing accidental opening after a water inlet butterfly valve is closed, comprising a valve body (1), a drive rod (2), and an anti-accidental opening mechanism, characterized in that: The anti-misoperation mechanism includes a sleeve (3), a limiting locking nut (4), a support column (5), a relay (6), and an installation assembly. The inner wall of the sleeve (3) is provided with an internal thread, and the outer wall of the limiting locking nut (4) is provided with an external thread. The internal thread matches the external thread. The limiting locking nut (4) is threadedly connected to the sleeve (3) through the external thread and the internal thread. The support column (5) is fixedly installed inside the limiting locking nut (4). The upper end of the support column (5) is located at the lower end of one side of the relay (6) and is in close contact with the relay (6).

2. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 1, characterized in that: The support column (5) has two symmetrically distributed grooves (7) on its two side walls.

3. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 1, characterized in that: The upper end of the output shaft of the drive air rod (2) is hinged to one side of the relay (6).

4. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 1, characterized in that: The top of the support column (5) is fitted with an anti-slip block (9), which has a T-shaped cross-sectional structure and is made of anti-slip rubber.

5. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 1, characterized in that: The mounting assembly includes a steel plate (10), a base (11), and a reinforcing member (12). The lower end of the sleeve (3) is welded to the steel plate (10). The steel plate (10) is mounted on the base (11) by fasteners (13). The lower end of the base (11) is welded with a reinforcing member (12). Both the base (11) and the reinforcing member (12) are embedded in cement (14).

6. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 5, characterized in that: The reinforcement member (12) is J-shaped, and there are four reinforcement members (12) in total, which are symmetrically distributed.

7. The device for preventing accidental opening after the inlet butterfly valve is closed according to claim 6, characterized in that: The fastener (13) is a reinforcing bolt. Threaded holes (8) are provided on the walls of the four corners of the base (11) and the steel plate (10). The threaded holes (8) on the base (11) and the steel plate (10) are threadedly connected to the reinforcing bolt.

Images