Perpendicularity control method for cylindrical valve servomotor of water turbine

Abstract

The invention discloses a water turbine cylindrical valve servomotor perpendicularity control method. The method comprises the steps that the acting force borne by a water turbine top cover during water filling operation is obtained based on a hydropower station operation water head, the self weight of parts on the water turbine top cover and water diversion on-way losses; according to the acting force borne by the water turbine top cover, simulation analysis is conducted on the water turbine top cover on the basis of finite element software under the water filling operation working condition, and the deformation amount of the corresponding position of the water turbine top cover is obtained; and according to the deformation amount of the corresponding position of the water turbine top cover, the padding amount of each cylindrical valve servomotor installation foundation table is adjusted, so that the influence of deformation deviation of the water turbine top cover after water filling on the perpendicularity of the servomotor is eliminated. According to the method, the vertical stress deformation deviation value of the mounting position of the cylindrical valve in the radial direction after water filling is simulated through a finite element method, and then reverse control is carried out through the cylindrical valve servomotor mounting base table, so that the water filling deformation influence is counteracted, and the problem that the water turbine cylindrical valve servomotor is blocked due to the fact that the perpendicularity is out of tolerance in the operation process is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic turbines, and particularly relates to a method for controlling the perpendicularity of a tubular valve servomotor of a hydraulic turbine. Background Art

[0002] A tubular valve is a new type of inlet valve on a hydraulic turbine, which is installed between the stay vanes and the guide vanes of the hydraulic turbine. When the tubular valve is closed, it falls on the bottom ring, cuts off the water flow and forms a seal with the top cover and the bottom ring. For a multi-sediment power station, it is used to protect the guide vane mechanism from gap cavitation and sediment abrasion when the unit is shut down. When the tubular valve is opened, it is located in the cavity between the stay ring and the top cover of the hydraulic turbine. The bottom edge of the tubular valve body is flush with the wear-resistant plate of the top cover, without disturbing the water flow pattern. When the hydraulic turbine unit runs away, the tubular valve can be closed with moving water to protect the unit from damage.

[0003] The tubular valve has the advantages of compact structure, linear motion, light weight, short opening and closing time, good hydraulic performance, and low head loss. The tubular valve usually adopts a direct cylinder servomotor for operation. Since the tubular valve is an important guarantee device at the front end of the water flow of the hydraulic turbine and an important protection device for preventing the hydraulic turbine from running away, preventing the tubular valve from jamming is the key to its reliability. And the control of the perpendicularity of the tubular valve servomotor during installation is the key. If the perpendicularity of the tubular valve servomotor cannot be properly controlled, it will cause the operation of the structure to jam, and then cause the tubular valve to be inoperable.

[0004] During the operation process after the hydraulic turbine unit is filled with water, due to the water pressure, the top cover of the hydraulic turbine will deform, which will cause the perpendicularity of the tubular valve servomotor above the top cover to change, resulting in the deflection of the tubular valve body during operation, and seriously causing the phenomenon of the tubular valve being stuck, affecting the normal operation of the unit. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for controlling the perpendicularity of a tubular valve servomotor of a hydraulic turbine in view of the problem that after the hydraulic turbine is filled with water, the hydraulic action causes the deformation of the top cover, resulting in the change of the perpendicularity of the tubular valve servomotor, and causing the jamming or even sticking of the tubular valve of the hydraulic turbine. By simulating the vertical stress deformation deviation amount along the radial direction of the installation position of the tubular valve after filling with water through the finite element method, and then performing reverse control by adding pads to the installation base at the lower end of the servomotor cylinder head, so as to offset the influence of the deformation after filling with water and prevent the problem of the perpendicularity of the tubular valve servomotor of the hydraulic turbine exceeding the tolerance during operation and causing jamming.

[0006] The present invention is realized by the following technical solutions:

[0007] In a first aspect, the present invention provides a method for controlling the perpendicularity of a tubular valve servomotor of a hydraulic turbine, including:

[0008] Step 1: Based on the operating head of the hydropower station, the self-weight of the upper components on the top cover of the hydraulic turbine, and the head loss along the water diversion, obtain the acting force on the top cover of the hydraulic turbine during the operation of filling with water;

[0009] Step 2: Based on the forces acting on the turbine top cover obtained in Step 1, under the operating conditions after the unit is filled with water using finite element software, conduct a simulation analysis on the turbine top cover to obtain the deformation amount at the corresponding position of the turbine top cover under the operating conditions.

[0010] Step 3: According to the deformation amount at the corresponding position of the turbine top cover obtained in Step 2, adjust the padding amount of the installation foundation platform of each barrel valve servomotor to eliminate the influence of the deformation deviation of the turbine top cover after water filling on the perpendicularity of the servomotor.

[0011] As a further solution of the present invention, the force acting on the turbine top cover in Step 1 is the water level drop between the highest water storage level elevation and the installation elevation of the turbine top cover minus the frictional loss along the water diversion and the part converted into kinetic energy of flow under the condition of the maximum load of the unit. At the same time, considering the gravity of the upper components on the top cover, the force acting on the top cover when the guide vanes are opened can be obtained.

[0012] As a further solution of the present invention, the deformation amount at the corresponding position of the turbine top cover in Step 2 should at least include the deformation amount at the installation positions of each barrel valve servomotor on the turbine top cover.

[0013] As a further solution of the present invention, in Step 2, under the operating conditions after the unit is filled with water, that is, when the barrel valve cylinder and the movable guide vanes of the unit are in the closed and different opening states, a displacement deformation nephogram of the turbine top cover is obtained through finite element analysis.

[0014] As a further solution of the present invention, the adjustment of the padding amount of the installation foundation platform of each barrel valve servomotor in Step 3 specifically includes: According to the deformation amount of the contact surface between the lower cylinder head of the barrel valve servomotor and the turbine top cover obtained by finite element simulation under the operating conditions after the unit is filled with water, calculate and determine the horizontal adjustment padding position of the barrel valve servomotor. The thickness and orientation of the padding are the same as the magnitude of the deformation amount simulated but in the opposite direction.

[0015] As a further solution of the present invention, in Step 3, according to the maximum deformation amount generated at the installation positions of each barrel valve servomotor on the turbine top cover under the operating conditions after the unit is filled with water, by adding padding in the reverse direction at the position of the installation foundation platform of each barrel valve servomotor, the perpendicularity of the barrel valve servomotor can be made within 0.2 mm / m after the unit is filled with water.

[0016] In a second aspect, the present invention provides a verticality adjustment structure for a tubular valve servomotor of a water turbine, comprising a tubular valve servomotor and a tubular valve cylinder body; the tubular valve cylinder body is located below the top cover of the water turbine, and a plurality of the tubular valve servomotors are circumferentially distributed on the top cover of the water turbine. The tubular valve servomotor is connected to the tubular valve cylinder body through a servomotor lifting rod, and a tubular valve servomotor installation base platform is arranged between the lower cylinder cover of the tubular valve servomotor and the top cover of the water turbine to adjust the verticality of the tubular valve servomotor.

[0017] As a further solution of the present invention, the opening and closing of the tubular valve cylinder body is realized by driving the servomotor lifting rod by each tubular valve servomotor to perform vertical movement.

[0018] As a further solution of the present invention, when the verticality of the tubular valve servomotor deviates, the verticality of the tubular valve servomotor is adjusted by adding pads to the tubular valve servomotor installation base platform between the lower cylinder cover of each tubular valve servomotor and the top cover of the water turbine.

[0019] As a further solution of the present invention, the tubular valve cylinder body and the servomotor lifting rod are connected by embedded bolts, and the connecting nut is a super nut and is placed in a window opened on the tubular valve cylinder body.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] In the verticality control method for the tubular valve servomotor of the water turbine proposed in the present invention, according to the force received by the top cover of the water turbine during the water filling operation of the unit, with the help of finite element software, under the operating conditions after the unit is filled with water, a simulation analysis is carried out on the top cover of the water turbine to obtain the deformation amount of the corresponding position of the top cover of the water turbine under the operating conditions. Based on this, the pad adding amount of the tubular valve servomotor installation base platform between the lower cylinder cover of the tubular valve servomotor at different positions and the top cover of the water turbine is adjusted, so as to eliminate the displacement deformation deviation of the top cover of the water turbine and control the verticality of the tubular valve of the water turbine within the standard range. Furthermore, it provides a reference basis for the verticality control of the tubular valve servomotor, which has practical significance and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0023] Figure 1 is a flowchart of the verticality control method for the tubular valve servomotor of the water turbine in the present invention;

[0024] Figure 2Schematic diagram of the distribution of the turbine top cover and the tubular valve servomotor in the present invention;

[0025] Figure 3 Displacement and deformation nephogram of the turbine top cover after water filling operation in the present invention;

[0026] Figure 4 Schematic sectional view of the assembly structure of the turbine top cover and the tubular valve in the present invention.

[0027] Marks in the drawings and corresponding part names:

[0028] 1 - Tubular valve servomotor; 2 - Installation base platform of the tubular valve servomotor; 3 - Turbine top cover; 4 - Servomotor lifting rod; 5 - Tubular valve cylinder. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0031] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features.

[0032] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, both A and B exist, and B exists. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0034] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0035] In the description of the embodiments of the present application, the term "a plurality of" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of sheets" means two or more sheets (including two sheets), unless otherwise specifically defined.

[0036] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, the technical terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0038] Please refer to Figures 1 to 4 , a method for controlling the perpendicularity of a servomotor of a tubular valve of a water turbine provided in the embodiments of the present application includes the following steps:

[0039] Step 1: Based on the operating head of the hydropower station, the self-weight of the components on the water turbine cover 3, and the head loss along the water diversion, obtain the force exerted on the water turbine cover 3 during the water filling operation.

[0040] Step 2: According to the force exerted on the water turbine cover 3 obtained in Step 1, based on finite element software, under the operating conditions after the unit is filled with water, perform a simulation analysis on the water turbine cover 3 to obtain the deformation amount at the corresponding position of the water turbine cover 3 under the operating conditions.

[0041] Step 3: According to the deformation amount at the corresponding position of the turbine top cover 3 obtained in Step 2, adjust the padding amount of the installation base platform 2 of each cylindrical valve servomotor to eliminate the influence of the deformation deviation of the turbine top cover 3 after water filling on the perpendicularity of the servomotor.

[0042] In the method for controlling the perpendicularity of the cylindrical valve servomotor 1 of the water turbine proposed in this application, according to the acting force on the turbine top cover 3 during the water filling and operation of the unit, with the help of finite element software, under the operating conditions after the unit is filled with water, a simulation analysis is carried out on the turbine top cover 3 to obtain the deformation amount at the corresponding position of the turbine top cover 3 under the operating conditions. Based on this, the padding amount of the installation base platform 2 of the cylindrical valve servomotor between the lower cylinder head of the cylindrical valve servomotor 1 at different positions and the turbine top cover 3 is adjusted, so as to eliminate the displacement deformation deviation of the turbine top cover 3 and control the perpendicularity of the cylindrical valve of the water turbine within the standard range. Furthermore, it provides a reference basis for the perpendicularity control of the cylindrical valve servomotor 1, which has practical significance and broad application prospects.

[0043] It should be noted that the operating head of the hydropower station in Step 1 is the difference between the upstream and downstream water levels of the hydropower station. The difference between the upstream water level and the downstream water level is called the gross head. The gross head minus the head loss is called the net head. The head loss refers to the sum of the local head loss and the frictional head loss during the process of the upstream water flow from the water intake (at the forebay or surge tank) through the high-pressure pipeline to the inlet section of the spiral case.

[0044] Since the upstream and downstream water levels of the hydropower station often change, various combinations of different upstream and downstream water levels actually occurring within a year will form different head values, among which the largest value is the maximum head and the smallest value is the minimum head. The average head can be calculated by different formulas. The simplest method is to take the arithmetic mean of the maximum head and the minimum head.

[0045] According to some embodiments of the present application, the acting force on the turbine top cover 3 can be divided into two cases. The first case is when the unit is shut down. Specifically, the maximum acting force under the condition of the closed cylindrical valve is obtained through the water level drop between the highest reservoir water level elevation and the installation elevation of the turbine top cover 3 and the gravity acting force of the upper components on the top cover. The second case is when the unit is under the maximum load. The acting force is the water level drop between the highest reservoir water level elevation and the installation elevation of the turbine top cover 3 minus the frictional head loss along the diversion and the part converted into kinetic energy of flow. At the same time, combined with the gravity of the upper components on the top cover, the acting force on the top cover when the guide vanes are opened can be obtained.

[0046] It should be noted that in the embodiments of the present application, the acting force in the second case is specifically used for simulation analysis and calculation. That is, in Step 1, based on the operating head of the hydropower station, the self-weight of the upper components of the turbine top cover 3, and the frictional head loss along the diversion, the acting force on the turbine top cover 3 during the water filling and operation is input into the finite element software, and a simulation analysis is carried out on the turbine top cover 3 to obtain the deformation amount at the corresponding position of the turbine top cover 3 under the operating conditions.

[0047] According to some embodiments of the present application, the deformation amount at the corresponding position of the turbine top cover 3 in the second step should at least include the deformation amount at the installation position of each cylindrical valve servomotor 1 on the turbine top cover 3.

[0048] Since the cylindrical valve body 5 is of a circular structure, the opening and closing of the cylindrical valve is realized by driving the cylindrical valve body 5 in the vertical direction through a plurality of cylindrical valve servomotors 1 arranged along the circumferential direction on the turbine top cover 3 (as Figure 2 shown as six in the figure) through the servomotor lifting rod 4. During the operation after the unit is filled with water, the turbine top cover 3 will undergo stress deformation under the hydraulic action, and this deformation will cause the perpendicularity of the cylindrical valve servomotor 1 to change. When the perpendicularity of the cylindrical valve servomotor 1 exceeds the installation standard, it will cause the operation of the structure to jam and the cylindrical valve cannot be operated.

[0049] In the present application, through finite element analysis, the deformation amount at the installation position of each cylindrical valve servomotor 1 on the turbine top cover 3 under the operating conditions of the unit is simulated, and based on this, the padding amount of the cylindrical valve servomotor installation base 2 between the lower cylinder head of the cylindrical valve servomotor 1 and the turbine top cover 3 at the corresponding position is pre-adjusted, so as to control the perpendicularity of the cylindrical valve servomotor 1 during operation.

[0050] According to some embodiments of the present application, the specific adjustment of the padding amount of each cylindrical valve servomotor installation base 2 in the third step includes: according to the deformation amount of the contact surface between the lower cylinder head of the cylindrical valve servomotor 1 and the turbine top cover 3 obtained by finite element simulation under the operating conditions after the unit is filled with water, calculate and determine the horizontal adjustment padding position of the cylindrical valve servomotor installation base 2, and the thickness and orientation of the padding are the same as and opposite to the deformation amount simulated.

[0051] For example, if the simulation analysis finds that after the unit is filled with water, the deformation amount is large near the center of the top cover in the radial direction of the top cover at the position where some cylindrical valve servomotors 1 are located, and the deformation gradually decreases away from the center, then the cylindrical valve servomotor installation base 2 at this position can be processed with a lower inner and higher outer in the radial direction in advance according to the deformation amount obtained from this simulation analysis. Similarly, if the deformation amount is small near the center of the top cover in the radial direction of the top cover at the position where some cylindrical valve servomotors 1 are located after the unit is filled with water, and the deformation gradually increases away from the center, then the cylindrical valve servomotor installation base 2 at this position can be processed with a higher inner and lower outer in the radial direction in advance according to the deformation amount obtained from this simulation analysis.

[0052] By padding and adjusting the cylindrical valve servomotor installation base 2 under the lower cylinder head of one or several cylindrical valve servomotors 1 at different orientations on the turbine top cover 3, the change in the perpendicularity of the cylindrical valve servomotor 1 caused by the deformation deviation of the turbine top cover 3 after the unit is filled with water is eliminated, so as to control the perpendicularity of the cylindrical valve servomotor 1 within the standard range.

[0053] According to some embodiments of the present application, in the second step, after the unit is filled with water, under the operating conditions, that is, when the barrel valve cylinder 5 and the movable guide vanes of the unit are both in the closed state and different opening degrees, the displacement and deformation nephogram of the turbine top cover 3 is obtained through finite element analysis, as Figure 3 shown. At this time, the water flow goes upward along the gaps between the barrel valve cylinder 5 and the turbine top cover 3 and between the barrel valve cylinder 5 and the stay ring, and the pressure is mainly concentrated on the inner side of the upper end of the turbine top cover 3.

[0054] According to some embodiments of the present application, in the third step, under the operating conditions after the unit is filled with water, under the action of the water pressure and its own gravity, the maximum deformation amount generated at the installation position of each barrel valve servomotor 1 on the turbine top cover 3 at this time is Δy. By adding pads in the reverse direction at the position of the installation base platform 2 of each barrel valve servomotor, the perpendicularity of the barrel valve servomotor 1 is made to reach within 0.2 mm / m after the unit is filled with water.

[0055] As Figure 4 shown, a perpendicularity adjustment structure for a barrel valve servomotor 1 of a water turbine provided in an embodiment of the present application includes a barrel valve servomotor 1 and a barrel valve cylinder 5; the barrel valve cylinder 5 is located below the turbine top cover 3, and a plurality of the barrel valve servomotors 1 are circumferentially distributed on the turbine top cover 3. The barrel valve servomotor 1 is connected to the barrel valve cylinder 5 through a servomotor lifting rod 4, and a barrel valve servomotor installation base platform 2 is arranged between the lower cylinder cover of the barrel valve servomotor 1 and the turbine top cover 3 to adjust the perpendicularity of the barrel valve servomotor 1.

[0056] According to some embodiments of the present application, the opening and closing of the barrel valve cylinder 5 are realized by driving the servomotor lifting rod 4 by each barrel valve servomotor 1 to move the barrel valve cylinder 5 in the vertical direction.

[0057] According to some embodiments of the present application, when the perpendicularity of the barrel valve servomotor 1 deviates, the perpendicularity of the barrel valve servomotor 1 is adjusted through the barrel valve servomotor installation base platform 2 between the lower cylinder cover of each barrel valve servomotor 1 and the turbine top cover 3. By changing the padding amount of the barrel valve servomotor installation base platform 2 between the lower cylinder cover of the barrel valve servomotor 1 at different positions on the turbine top cover 3 and the turbine top cover 3, the perpendicularity of the barrel valve servomotor 1 is made to meet the requirements, preventing the barrel valve cylinder 5 from skewing when it operates.

[0058] According to some embodiments of the present application, the barrel valve cylinder 5 and the servomotor lifting rod 4 are connected by embedded bolts, and the connecting nut is a super nut and is placed in a window opened on the barrel valve cylinder 5.

[0059] The specific embodiments described above further elaborate on the objective, technical solution and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for controlling the perpendicularity of a tubular valve servomotor of a water turbine, characterized in that, including: Step 1: Obtain the force exerted on the turbine top cover during water filling operation based on the operating head of the hydropower station, the self-weight of the components on the turbine top cover, and the head loss along the penstock. Step 2: Based on the force exerted on the turbine top cover obtained in Step 1, perform a simulation analysis on the turbine top cover using finite element software under the operating conditions after the unit is filled with water, and obtain the deformation of the corresponding position of the turbine top cover under the operating conditions. Step 3: According to the deformation of the corresponding position of the turbine top cover obtained in Step 2, adjust the padding amount of the installation base of each barrel valve actuator to eliminate the influence of the deformation deviation of the turbine top cover after water filling on the perpendicularity of the actuator.

2. The verticality control method of the tubular valve servomotor of the hydraulic turbine according to claim 1, characterized in that, The force exerted on the turbine top cover in Step 1 is the water level drop between the highest reservoir water level elevation and the installation elevation of the turbine top cover minus the head loss along the penstock and the part converted into kinetic energy of flow under the condition of the maximum load of the unit. At the same time, considering the gravity of the components on the top cover, the force exerted on the top cover when the guide vanes are opened can be obtained.

3. The verticality control method of the tubular valve servomotor of the water turbine according to claim 1, characterized in that, The deformation of the corresponding position of the turbine top cover in Step 2 should at least include the deformation of the installation positions of each barrel valve actuator on the turbine top cover.

4. The verticality control method of the tubular valve servomotor of the water turbine according to claim 1, characterized in that, In Step 2, under the operating conditions after the unit is filled with water, that is, when the barrel valve body and the movable guide vanes of the unit are in the closed and different opening states, the displacement deformation nephogram of the turbine top cover and the barrel valve is obtained through finite element analysis.

5. The verticality control method of the tubular valve servomotor of the water turbine according to claim 1, characterized in that, The adjustment of the padding amount of the installation base of each barrel valve actuator in Step 3 specifically includes: According to the deformation of the contact surface between the lower cylinder head of the barrel valve actuator and the turbine top cover obtained by finite element simulation under the operating conditions after the unit is filled with water, calculate and determine the horizontal adjustment padding position of the barrel valve actuator. The thickness and orientation of the padding are the same as the magnitude of the deformation simulated but in the opposite direction.

6. The verticality control method of the cylindrical valve servomotor of a hydraulic turbine according to claim 1, wherein, In Step 3, according to the maximum deformation generated at the installation positions of each barrel valve actuator on the turbine top cover under the operating conditions after the unit is filled with water, by adding padding in the opposite direction at the position of the installation base of each barrel valve actuator, the perpendicularity of the barrel valve actuator is made to be within 0.2 mm / m after the unit is filled with water.

7. A verticality adjusting structure for the servomotor of a tubular valve of a water turbine, characterized in that, including barrel valve actuators and barrel valve bodies; the barrel valve bodies are located below the turbine top cover, and multiple barrel valve actuators are circumferentially distributed on the turbine top cover. The barrel valve actuators are connected to the barrel valve bodies through actuator lifting rods. A barrel valve actuator installation base is provided between the lower cylinder head of the barrel valve actuator and the turbine top cover to adjust the perpendicularity of the barrel valve actuator.

8. The verticality adjusting structure of the tubular valve servomotor of the water turbine according to claim 7, characterized in that, The opening and closing of the barrel valve body are realized by driving the actuator lifting rods by each barrel valve actuator to move in the vertical direction.

9. The verticality adjustment structure of the tubular valve servomotor of the water turbine according to claim 7, characterized in that, When the perpendicularity of the barrel valve actuator deviates, the perpendicularity of the barrel valve actuator is adjusted by adding padding to the barrel valve actuator installation base between the lower cylinder head of each barrel valve actuator and the turbine top cover.

10. The verticality adjustment structure of the tubular valve servomotor of the water turbine according to claim 7, characterized in that, The barrel valve body and the actuator lifting rod are connected by embedded bolts, and the connecting nuts are super nuts and are placed in the windows opened on the barrel valve body.

Images