Sealing ball valve for water inlet of water turbine

Abstract

The utility model relates to the technical field of valves, in particular to a sealing ball valve for water inlet of a water turbine. The valve comprises a valve body, a valve, a valve seat, a valve rod and a swing mechanism. A pressure supply port and a medium inlet are formed in the inlet end and the outlet end of the valve body; the valve is rotationally arranged in the valve body, a circulation through hole is formed in the valve, and the circulation through hole can communicate with the inlet end and the outlet end in the rotating process of the valve; the two valve seats are connected to the inlet end and the outlet end, piston cylinders are formed by the valve seats and the inner walls of the inlet end and the outlet end respectively, sealing pieces are arranged in the piston cylinders, elastic pieces are connected between the sealing pieces and the valve seats, the pressure supply port is communicated with the piston cylinders and located between the valve and the sealing pieces, and the medium inlet is located on the same side of the valve and the sealing pieces; the valve rod is connected with the valve and rotationally connected with the valve body. The swing mechanism is connected with the valve rod. The sealing surface of the sealing piece can be prevented from being excessively abraded, and the sealing effect between the sealing piece and the valve can be guaranteed for a long time.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a sealing ball valve for water inlet of a turbine. Background Art

[0002] The turbine is one of the important electromechanical equipment of the hydropower station. In order to ensure the safe and reliable operation of the turbine, a main water inlet valve is installed at the inlet of the turbine. The upstream of the main valve is connected to the pressure steel pipe, and the downstream of the main valve is connected to the turbine water inlet volute. On the one hand, when the turbine unit needs to be repaired, the main valve cuts off the water flow in the pressure steel pipe to ensure the safety of the maintenance unit. On the other hand, when the turbine and the engine are abnormal, it can reliably and effectively shut down and cut off the water flow to prevent accidents. The main water inlet valve of the turbine is a ball valve. In the ball valve currently used, the position of the seal is fixed, that is, there is a large contact pressure between the valve and the seal during the assembly process. Because the opening and closing torque is large during operation, the sealing surface is easily scratched during the relative sliding of the valve and the seal. Therefore, the working seal and maintenance seal often do not work, the ball valve is not closed tightly, and the leakage is serious, which makes the shutdown and maintenance face great challenges. Utility Model Content

[0003] The present application provides a sealed ball valve for water inlet of a turbine. By setting the sealing member matched with the valve as an elastic sliding structure, the sealing member can obtain a certain buffer during the rotation of the valve, thereby avoiding the problem of the sealing surface being scratched due to excessive opening and closing torque between the valve sealing members.

[0004] This application is implemented through the following technical solutions:

[0005] A sealing ball valve for water inlet of a water turbine, comprising:

[0006] A valve body, wherein the inlet and outlet ends of the valve body are provided with a pressure supply port and a medium inlet;

[0007] A valve, the valve being rotatably disposed in the valve body, the valve being provided with a flow through hole, the flow through hole being able to communicate with the inlet end and the outlet end during the rotation of the valve;

[0008] A valve seat, wherein two valve seats are connected to the inlet end and the outlet end, wherein the valve seat and the inner walls of the inlet end and the outlet end respectively form a piston cylinder, wherein a sealing member is arranged in the piston cylinder to form a piston structure with the piston cylinder, and an elastic member is connected between the sealing member and the valve seat so that the sealing member has a tendency to move toward the valve, wherein the pressure supply port is communicated with the piston cylinder and the pressure supply port is located between the valve and the sealing member, and the medium inlet is located on the same side of the valve and the sealing member;

[0009] a valve stem, the valve stem being connected to the valve and being rotatably connected to the valve body;

[0010] A swing mechanism is connected to the valve stem to drive the valve stem to rotate relative to the valve seat.

[0011] The sealed ball valve for water inlet of a turbine provided in the present application can, when in use, connect the pressure supply port and the medium inlet to the high-pressure supply system and the medium supply system respectively; since the piston cylinder between the seal, the valve seat and the valve body forms a piston structure, the seal can be tightly pressed against the valve to achieve sealing under the hydraulic pressure of the medium; the elastic member between the seal and the valve seat can provide further pressure for the seal to ensure the sealing effect between the valve and the seal, and at the same time can prevent the seal from detaching from the valve and causing sealing failure when the medium supply system generates hydraulic fluctuations; when the valve is turned, high-pressure liquid can be supplied to the piston cylinder through the pressure supply port to make the seal move in a direction away from the valve or to make the seal have a tendency to move away from the valve, thereby reducing the contact pressure between the seal and the valve or the seal can detach from the valve, which will prevent the sealing surface on the seal from being severely worn during the opening and closing process.

[0012] In some optional embodiments, the elastic member is configured as a compression spring.

[0013] In some optional embodiments, the swing mechanism includes:

[0014] A connecting ring, the connecting ring cooperates with the valve stem to drive the valve stem to rotate;

[0015] a first swing arm, the first swing arm being connected to the connecting ring;

[0016] a second swing arm, the second swing arm being rotatably connected to the first swing arm;

[0017] A telescopic component, wherein the moving end of the telescopic component is connected to the second swing arm, and the telescopic component is rotatably connected to a mounting seat, and the mounting seat is used to connect to a fixing facility.

[0018] In some optional embodiments, the telescopic assembly is configured as a hydraulic rod.

[0019] In some optional embodiments, the valve stem comprises:

[0020] a first valve stem, the first valve stem being connected to the valve, and the first valve stem being matched with the axial hole of the connecting ring so that the first valve stem can rotate freely in the connecting ring;

[0021] a second valve stem, wherein the second valve stem is sleeved on the first valve stem, a first limiting structure is configured between the first valve stem and the second valve stem, and the first limiting structure can limit the second valve stem from rotating relative to the first valve stem;

[0022] an operating handle connected to the second valve stem;

[0023] A second limiting structure is arranged between the second valve stem and the connecting ring. When the second valve stem slides on the first valve stem into the connecting ring, the second limiting structure can limit the relative rotation of the second valve stem and the connecting ring.

[0024] In some optional embodiments, the connecting ring is connected to the valve body via a plane bearing.

[0025] In some optional embodiments, the first limiting structure includes:

[0026] A first limiting protrusion, wherein the first limiting protrusion is located on the first valve stem;

[0027] A first limiting groove, wherein the first limiting groove is located on an inner wall of the second valve stem;

[0028] A second limiting protrusion, wherein two of the second limiting protrusions are located at two ends of the second limiting groove along the length direction of the first valve stem, and an active cavity capable of accommodating the first limiting protrusion is formed between the two second limiting protrusions.

[0029] In some optional embodiments, the second limiting structure includes:

[0030] a third limiting protrusion, wherein the third limiting protrusion is located on the outer wall of the second valve stem;

[0031] A second limiting groove, wherein the second limiting groove is located on the inner wall of the connecting ring;

[0032] When the second valve stem slides relative to the first valve stem, the third limiting protrusion can cooperate with the second limiting groove and the first limiting protrusion can form a limiting cooperation with the second limiting protrusion.

[0033] In some optional embodiments, a rebound member is arranged between the second valve stem and the first limiting valve stem so that the second valve stem has a tendency to move away from the connecting ring on the first valve stem, and a third limiting structure is also arranged between the second valve stem and the first valve stem so that when the second limiting structure forms a limit on the second valve stem, the third limiting structure can limit the second valve stem from sliding on the first valve stem.

[0034] In some optional embodiments, the third limiting structure includes:

[0035] A limiting groove, the limiting groove is located on the first valve stem, the limiting groove has a first section and a second section, in a first direction, the cross-sectional lengths of the first section and the second section are equal, and in a second direction, the cross-sectional length of the first section is smaller than the cross-sectional length of the second section;

[0036] A limit rod, wherein the limit rod is elastically rotatably connected to the second valve stem, and the limit rod has a third section and a fourth section, wherein the third section is constructed to be rotatable within the first section, and the fourth section is constructed to be adapted to the shape of the first section and to be rotatable within the second section.

[0037] Compared with the prior art, this application has the following advantages and beneficial effects:

[0038] The sealed ball valve for water inlet of a turbine provided in the present application can, when in use, connect the pressure supply port and the medium inlet to the high-pressure supply system and the medium supply system respectively; since the piston cylinder between the seal, the valve seat and the valve body forms a piston structure, the seal can be tightly pressed against the valve to achieve sealing under the hydraulic pressure of the medium; the elastic member between the seal and the valve seat can provide further pressure for the seal to ensure the sealing effect between the valve and the seal, and at the same time can prevent the seal from detaching from the valve and causing sealing failure when the medium supply system generates hydraulic fluctuations; when the valve is turned, high-pressure liquid can be supplied to the piston cylinder through the pressure supply port to make the seal move in a direction away from the valve or to make the seal have a tendency to move away from the valve, thereby reducing the contact pressure between the seal and the valve or the seal can detach from the valve, which will prevent the sealing surface on the seal from being severely worn during the opening and closing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the embodiments of the present application, constitute a part of the present application, and do not constitute a limitation on the embodiments of the present application. In the drawings:

[0040] Figure 1 A schematic diagram of the cross-sectional structure of a sealed ball valve for water inlet of a turbine provided in an embodiment of the present application;

[0041] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0042] Figure 3 A schematic diagram of a valve stem structure provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of a cross-sectional structure of a second valve stem provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of the swing mechanism structure provided in an embodiment of the present application.

[0045] Marks and corresponding parts names in the attached drawings:

[0046] 1-valve body, 2-valve, 3-valve seat, 4-valve stem, 5-swing mechanism, 6-pressure supply port, 7-medium inlet, 8-sealing member, 9-elastic member, 10-connecting ring, 11-first swing arm, 12-second swing arm, 13-telescopic assembly, 14-mounting seat, 15-first valve stem, 16-second valve stem, 17-operating handle, 18-plane bearing, 19-first limiting protrusion, 20-second limiting protrusion, 21-first limiting groove, 22-third limiting protrusion, 23-second limiting groove, 24-rebound member, 25-limiting groove, 26-limiting rod. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with examples and drawings. The illustrative implementation scheme of the present application and its description are only used to explain the present application and are not intended to limit the present application.

[0048] like Figure 1-Figure 5As shown, the embodiment of the present application provides a sealed ball valve for water inlet of a water turbine, which includes a valve body 1, a valve 2, a valve seat 3, a valve stem 4 and a swing mechanism 5; a pressure supply port 6 and a medium inlet 7 are provided on the inlet end and the outlet end of the valve body 1; the valve 2 is rotatably arranged in the valve body 1, and a flow perforation is provided on the valve 2, and the flow perforation can be connected with the inlet end and the outlet end during the rotation of the valve 2, that is, the medium can pass through the inlet end, the flow perforation and the outlet end in sequence; two valve seats 3 are connected to the inlet end and the outlet end, and the valve seat 3 is used to connect other fixing facilities to realize the installation of the ball valve, and the valve seat 3 and the inner wall of the inlet end and the outlet end respectively form a piston cylinder, for example, the valve seat 3 has an annular boss with a diameter smaller than the inlet end and the outlet end, after the valve seat 3 is matched with the inlet end and the outlet end, the annular boss is located in the inlet end and the outlet end, and a piston cylinder is formed between the annular boss and the inner wall of the inlet end and the outlet end, and a sealing member 8 is provided in the piston cylinder to communicate with the piston cylinder The piston cylinder forms a piston structure, and an elastic member 9 is connected between the seal 8 and the valve seat 3 so that the seal 8 has a tendency to move toward the valve 2, wherein the pressure supply port 6 is connected to the piston cylinder and the pressure supply port 6 is located between the valve 2 and the seal 8, so that when hydraulic pressure is supplied through the pressure supply port 6, the seal 8 can move in the piston cylinder in a direction away from the valve 2, and the medium inlet 7 is located on the same side of the valve 2 and the seal 8, so that when hydraulic pressure is supplied through the medium inlet 7, the seal 8 can move in the piston cylinder in a direction close to the valve 2; the valve stem 4 is connected to the valve 2 and is rotatably connected to the valve body 1, so that the valve 2 can be driven to rotate by operating the valve stem 4 to rotate, thereby enabling the flow perforation to be connected to the inlet end and the outlet end; the swing mechanism 5 is connected to the valve stem 4 to drive the valve stem 4 to rotate relative to the valve seat 3. In actual implementation, the swing mechanism 5 is a swing mechanism 5 with its own driving source, and the swing mechanism 5 can be configured with a control system to realize automatic opening and closing of the valve 2.

[0049] The sealed ball valve for water inlet of a turbine provided in the present application can be used to connect the pressure supply port 6 and the medium inlet 7 to the high-pressure supply system and the medium supply system respectively. Since the piston cylinder between the seal 8, the valve seat 3 and the valve body 1 forms a piston structure, the seal 8 can be tightly pressed on the valve 2 under the hydraulic pressure of the medium to achieve sealing. The elastic member 9 between the seal 8 and the valve seat 3 can provide further pressure for the seal 8 to ensure the sealing effect between the valve 2 and the seal 8, and at the same time can prevent the seal 8 from separating from the valve 2 and causing sealing failure when the medium supply system generates hydraulic fluctuations; when the valve 2 is rotated, high-pressure liquid can be supplied to the piston cylinder through the pressure supply port 6 to make the seal 8 move in a direction away from the valve 2 or to make the seal 8 have a tendency to move away from the valve 2, so that the contact pressure between the seal 8 and the valve 2 is reduced or the seal 8 can be separated from the valve 2, which will prevent the sealing surface of the seal 8 from being severely worn during the opening and closing process.

[0050] In some optional embodiments, for the convenience of implementation, the elastic member 9 can be configured as a compression spring. The compression spring is easy to obtain, low in cost and simple to assemble, which can reduce the overall production cost of the ball valve.

[0051] In some optional embodiments, the swing mechanism 5 may specifically include a connecting ring 10, a first swing arm 11, a second swing arm 12 and a telescopic assembly 13; the connecting ring 10 cooperates with the valve stem 4 to drive the valve stem 4 to rotate. In actual implementation, the overall shape of the valve stem 4 can be configured as a cylinder, the connecting ring 10 can be configured as a ring, and the connecting ring 10 and the valve stem 4 can be configured by setting a key or other limiting structure so that the two can rotate synchronously; the first swing arm 11 is connected to the connecting ring 10; the second swing arm 12 is rotatably connected to the first swing arm 11; the moving end of the telescopic assembly 13 is connected to the second swing arm 12, so that the telescopic assembly 13 can drive the first swing arm 11 to rotate during the telescopic process, thereby driving the connecting ring 10 to rotate, and the telescopic assembly 13 is rotatably connected with a mounting seat 14, and the mounting seat 14 is used to connect fixed facilities. After configuring a control system for the telescopic assembly 13, the ball valve can be automatically opened or closed, thereby improving the convenience of use. In actual implementation, the telescopic assembly 13 can be configured as a hydraulic rod.

[0052] It should be noted that the fixed arrangement may be some fixed structures at the installation site of the ball valve, or may be the valve body 1 itself.

[0053] In some optional embodiments, the ball valve should have the function of being able to be opened manually on the basis of being able to realize automatic opening and closing, so as to avoid the situation where the ball valve cannot be opened or closed when the telescopic component 13 fails. Specifically, the valve stem 4 may include a first valve stem 15, a second valve stem 16 and an operating handle 17; the first valve stem 15 is connected to the valve 2, and the first valve stem 15 cooperates with the axial hole of the connecting ring 10 so that the first valve stem 15 can rotate freely in the connecting ring 10; the second valve stem 16 is sleeved on the first valve stem 15, and a first limiting structure is constructed between the first valve stem 15 and the second valve stem 16, and the first limiting structure can The second valve stem 16 can be limited to rotate relative to the first valve stem 15, so that by rotating the second valve stem 16, the first valve stem 15 can drive the valve 2 to rotate to realize the opening and closing of the ball valve; the operating handle 17 is connected to the second valve stem 16; wherein, a second limiting structure is arranged between the second valve stem 16 and the connecting ring 10, when the second valve stem 16 slides on the first valve stem 15 into the connecting ring 10, the second limiting structure can limit the relative rotation of the second valve stem 16 and the connecting ring 10, that is, the second limiting structure can play a limiting role or the limiting role fails during the sliding process of the second valve stem 16. Therefore, when automatic opening and closing is required, the second valve stem 16 slides on the first valve stem 15 so that the second limiting structure can play a limiting role. At this time, driven by the telescopic component 13, the connecting ring 10 drives the second valve stem 16 to rotate by relying on the limiting effect of the second limiting structure; when manual automatic opening and closing is required, the second valve stem 16 slides on the first valve stem 15 so that the second valve stem 16 is separated from the connecting ring 10, that is, the limiting effect of the second limiting mechanism fails. At this time, the second valve stem 16 can be rotated manually without being restricted by the connecting ring 10.

[0054] In the embodiment of the present application, in the process of switching from automatic opening and closing to manual opening and closing, it is only necessary to stop the movement of the telescopic component 13, and there is no need to shut down the telescopic component 13. At the same time, the telescopic state of the telescopic component 13 is not affected during the manual adjustment process, and the use convenience is relatively high.

[0055] In some optional embodiments, the connecting ring 10 is connected to the valve body 1 via a plane bearing 18. The plane bearing 18 can position the connecting ring 10, ensure the stable rotation of the connecting ring 10, and avoid generating a large torque on the first valve stem 15 during the rotation of the connecting ring 10.

[0056] In some optional embodiments, the first limiting structure may specifically include a first limiting protrusion 19, a first limiting groove 21, and a second limiting protrusion 20; the first limiting protrusion 19 is located on the first valve stem 15, the first limiting protrusion 19 can be constructed as a square protrusion and form an integral structure with the first valve stem 15, the number of the first limiting protrusions 19 can be configured as multiple, for example, four, the four first limiting protrusions 19 are evenly distributed along the circumference of the first valve stem 15; the first limiting groove 21 is located on the inner wall of the second valve stem 16, the first limiting groove 21 can be constructed as an annular groove, the groove depth of the first limiting groove 21 is equal to the height of the first limiting protrusion 19; the two second limiting protrusions 20 are located in the first limiting groove 21 along the first At both ends of the valve stem 15 in the length direction, an active cavity capable of accommodating the first limiting protrusion 19 is formed between the two second limiting protrusions 20, wherein the number of the second limiting protrusions 20 can be configured as an integer multiple of 2, that is, four, six, eight, or sixteen. In actual implementation, when the number of the first limiting protrusions 19 is configured as four, the number of the second limiting protrusions 20 can be configured as sixteen, and each eight are located at one end of the first limiting groove 21 along the length direction of the first valve stem 15. The eight second limiting protrusions 20 are evenly distributed along the circumference of the first valve stem 15 in groups of two. When the first limiting protrusion 19 is located between the two second limiting protrusions 20 in each group, the second valve stem 16 can be limited from rotating relative to the first valve stem 15. Assuming that the length direction of the first valve stem 15 is vertical in the working state, when opening and closing automatically, the first limiting protrusion 19 cooperates with the two second limiting protrusions 20 at the upper end of the first limiting groove 21, and when opening and closing manually, the first limiting protrusion 19 cooperates with the two second limiting protrusions 20 at the lower end of the first limiting groove 21. Of course, the first limiting protrusion 19 can also play a limiting role when it is located between the two groups of second limiting protrusions 20, but it is necessary to idle the second valve stem 16 for a certain angle before the valve 2 can be driven to rotate. When the first limiting protrusion 19 is located between the second limiting protrusions 20 at the upper and lower ends, the second valve stem 16 can rotate relative to the first valve stem 15, thereby realizing the relative position adjustment of the second valve stem 16 and the first valve stem 15 in the circumferential direction, improving the convenience of use. After adjustment, the first limiting protrusion 19 can be located between the two second limiting protrusions 20 in each group or between the two groups of second limiting protrusions 20 according to the situation.

[0057] In some optional embodiments, the second limiting structure may specifically include a third limiting protrusion 22 and a second limiting groove 23; the third limiting protrusion 22 is located on the outer wall of the second valve stem 16; the second limiting groove 23 is located on the inner wall of the connecting ring 10; when the second valve stem 16 slides relative to the first valve stem 15, the third limiting protrusion 22 can cooperate with the second limiting groove 23 and the first limiting protrusion 19 can form a limiting cooperation with the second limiting protrusion 20.

[0058] In some optional embodiments, a rebound member 24 is arranged between the second valve stem 16 and the first limiting valve stem 4 so that the second valve stem 16 has a tendency to move away from the connecting ring 10 on the first valve stem 15, that is, under the action of the elastic force provided by the rebound member 24, the first limiting protrusion 19 cooperates with the second limiting protrusion 20 at the upper end, and a third limiting structure is also arranged between the second valve stem 16 and the first valve stem 15 so that when the second limiting structure forms a restriction on the second valve stem 16, the third limiting structure can limit the second valve stem 16 from sliding on the first valve stem 15, that is, when the first limiting protrusion 19 cooperates with the second limiting protrusion 20 at the lower end, the position of the second valve stem 16 in the length direction of the first valve stem 15 can be maintained through the action of the third limiting structure, so that the third limiting protrusion 22 can be prevented from jumping in the second limiting groove 23, thereby ensuring that the connecting ring 10 can stably drive the second valve stem 16 to rotate.

[0059] In some optional embodiments, the third limiting structure may specifically include a limiting groove 25 and a limiting rod 26; the limiting groove 25 is located on the first valve stem 15, and the limiting groove 25 has a first section and a second section. In the first direction, the cross-sectional lengths of the first section and the second section are equal, and in the second direction, the cross-sectional length of the first section is less than the cross-sectional length of the second section, that is, the limiting groove 25 is similar to the shape of an expanded hole. Specifically, the cross-sectional shape of the first section may be a rectangle, and the cross-sectional shape of the second section may be a square. The side length of the square is equal to the length of the rectangle, and the centroids of the square and the rectangle coincide. The limiting rod 26 is elastically connected to the second valve stem 16 Rotational connection, the limit rod 26 has a third section and a fourth section, wherein the third section is configured to be rotatable in the first section, and the fourth section is configured to be adapted to the shape of the first section and rotatable in the second section, so that when the fourth section moves from the first section to the second section, the limit rod 26 automatically rotates under the action of elastic rotation, and at this time the limit rod 26 can form a clamping connection with the limit groove 25. When the clamping connection needs to be released, it is only necessary to rotate the limit rod 26 to make the fourth section correspond to the first section, and the second valve stem 16 moves up under the action of the rebound member 24, and the second valve stem 16 can drive the limit rod 26 to move up so that the fourth section is located in the first section. In this way, in the process of converting automatic opening and closing to manual opening and closing, it is only necessary to rotate the limit rod 26 to make the second valve stem 16 automatically rise and not slide down freely.

[0060] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A sealing ball valve for water inlet of a turbine, characterized in that: include: A valve body (1), wherein a pressure supply port (6) and a medium inlet (7) are provided at the inlet end and the outlet end of the valve body (1); A valve (2), the valve (2) being rotatably disposed in the valve body (1), the valve (2) being provided with a flow through hole, the flow through hole being able to communicate with the inlet end and the outlet end during the rotation of the valve (2); A valve seat (3), wherein two valve seats (3) are connected to the inlet end and the outlet end, the valve seat (3) and the inner walls of the inlet end and the outlet end respectively form a piston cylinder, a sealing member (8) is arranged in the piston cylinder to form a piston structure with the piston cylinder, an elastic member (9) is connected between the sealing member (8) and the valve seat (3) so that the sealing member (8) has a tendency to move toward the valve (2), wherein the pressure supply port (6) is connected to the piston cylinder and the pressure supply port (6) is located between the valve (2) and the sealing member (8), and the medium inlet (7) is located on the same side of the valve (2) and the sealing member (8); A valve stem (4), the valve stem (4) being connected to the valve (2) and rotatably connected to the valve body (1); A swing mechanism (5), the swing mechanism (5) being connected to the valve stem (4) to drive the valve stem (4) to rotate relative to the valve seat (3).

2. The sealing ball valve for water inlet of a water turbine according to claim 1, characterized in that: The elastic member (9) is configured as a compression spring.

3. The sealing ball valve for water inlet of a water turbine according to claim 1, characterized in that: The swing mechanism (5) comprises: a connecting ring (10), the connecting ring (10) cooperating with the valve stem (4) to drive the valve stem (4) to rotate; A first swing arm (11), the first swing arm (11) being connected to the connecting ring (10); a second swing arm (12), the second swing arm (12) being rotatably connected to the first swing arm (11); A telescopic component (13), wherein a moving end of the telescopic component (13) is connected to the second swing arm (12), and the telescopic component (13) is rotatably connected to a mounting seat (14), wherein the mounting seat (14) is used to connect to a fixing facility.

4. The sealing ball valve for water inlet of a water turbine according to claim 3, characterized in that: The telescopic assembly (13) is configured as a hydraulic rod.

5. The sealing ball valve for water inlet of a water turbine according to claim 3, characterized in that: The valve stem (4) comprises: a first valve stem (15), the first valve stem (15) being connected to the valve (2), the first valve stem (15) being matched with the axial hole of the connecting ring (10) so that the first valve stem (15) can rotate freely in the connecting ring (10); a second valve stem (16), the second valve stem (16) being sleeved on the first valve stem (15), a first limiting structure being constructed between the first valve stem (15) and the second valve stem (16), the first limiting structure being capable of limiting the second valve stem (16) from rotating relative to the first valve stem (15); an operating handle (17), the operating handle (17) being connected to the second valve stem (16); A second limiting structure is arranged between the second valve stem (16) and the connecting ring (10), and when the second valve stem (16) slides on the first valve stem (15) into the connecting ring (10), the second limiting structure can limit the relative rotation of the second valve stem (16) and the connecting ring (10).

6. The sealing ball valve for water inlet of a water turbine according to claim 5, characterized in that: The connecting ring (10) is connected to the valve body (1) via a plane bearing (18).

7. The sealing ball valve for water inlet of a water turbine according to claim 5, characterized in that: The first limiting structure comprises: a first limiting protrusion (19), wherein the first limiting protrusion (19) is located on the first valve stem (15); a first limiting groove (21), the first limiting groove (21) being located on an inner wall of the second valve stem (16); A second limiting protrusion (20), wherein two of the second limiting protrusions (20) are located in the first limiting groove (21) at two ends along the length direction of the first valve stem (15), and a movable cavity capable of accommodating the first limiting protrusion (19) is formed between the two second limiting protrusions (20).

8. The sealing ball valve for water inlet of a water turbine according to claim 7, characterized in that: The second limiting structure comprises: a third limiting protrusion (22), the third limiting protrusion (22) being located on an outer wall of the second valve stem (16); A second limiting groove (23), the second limiting groove (23) being located on the inner wall of the connecting ring (10); When the second valve stem (16) slides relative to the first valve stem (15), the third limiting protrusion (22) can cooperate with the second limiting groove (23) and the first limiting protrusion (19) can form a limiting cooperation with the second limiting protrusion (20).

9. The sealing ball valve for water inlet of a water turbine according to claim 5, characterized in that: A resilient member (24) is arranged between the second valve stem (16) and the first valve stem (15) so that the second valve stem (16) has a tendency to move away from the connecting ring (10) on the first valve stem (15), and a third limiting structure is also arranged between the second valve stem (16) and the first valve stem (15) so that when the second limiting structure forms a limit on the second valve stem (16), the third limiting structure can limit the second valve stem (16) from sliding on the first valve stem (15).

10. The sealing ball valve for water inlet of a water turbine according to claim 9, characterized in that: The third limiting structure comprises: a limiting groove (25), the limiting groove (25) being located on the first valve stem (15), the limiting groove (25) comprising a first section and a second section, wherein in a first direction, the cross-sectional lengths of the first section and the second section are equal, and in a second direction, the cross-sectional length of the first section is smaller than the cross-sectional length of the second section; A limit rod (26), wherein the limit rod (26) is elastically rotatably connected to the second valve stem (16), and the limit rod (26) has a third section and a fourth section, wherein the third section is constructed to be rotatable within the first section, and the fourth section is constructed to be adapted to the shape of the first section and to be rotatable within the second section.

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