Installation method of water turbine control ring anti-lifting device

Abstract

The present invention relates to the technical field of hydro-generator equipment and discloses a method for installing a hydro-turbine control ring anti-lift device, comprising the following steps: step 1, installing two servomotors on the control ring respectively, and determining the pressure difference generated by the two servomotors; step 2, determining the overturning torque T generated by the servomotor differential pressure. 翻 ; Step 3, according to the flipping torque T 翻 Determine the force F generated at a single platen 压 ; Step 4, determine the force F at the bolt based on the force generated at a single pressure plate 螺 ; Step 5, according to the force F at the bolt of the single pressure plate 螺 And the bending stress σ1=(F 螺 / n) / S 螺 To determine the diameter and number of bolts on a single pressure plate and install them. This prevents the control ring from tilting up and ensures safe and stable operation of the unit.

Description

Technical Field

[0001] The invention relates to the technical field of hydro-generator equipment, and in particular to an installation method of a hydro-turbine control ring anti-lift device. Background Art

[0002] The turbine control ring is the connection between the servomotor and the guide vane arm. It transmits the force generated by the servomotor through the large lugs of the control ring to the guide vane arm, which then rotates the turbine guide vanes. This transmission occurs simultaneously and is a one-time process.

[0003] Chinese patent document CN115188258A discloses a turbine water guide mechanism for maintenance training and evaluation, including a support frame, on which a bottom ring, a control ring and two relays are installed; the output end of the relay is hinged with a connecting rod, and the ends of the two connecting rods are respectively hinged to the opposite sides of the control ring; the top surface of the control ring is evenly distributed along the circumference with multiple vertical gap adjustment components, and the top surface of the bottom ring is evenly distributed along the circumference with multiple guide vane units.

[0004] This existing technology has the following deficiencies: the transmission force occurs simultaneously and is transmitted at one time; because the transmission force is transmitted from the large ear hole on the upper part of the control ring to the small ear hole on the lower part of the control ring, there is a height difference between the two, and there are errors in the height of the two large ear holes when the control ring is manufactured, and the horizontality of the relay during installation is also allowed to have errors. Due to the combined effect of various errors, a non-horizontal force will be generated on the control ring itself, causing the control ring to tilt upward. If the design method of the control ring anti-lift device is incorrect, it will not be able to prevent the control ring from lifting, which will eventually cause the entire turbine transmission system to be blocked and the turbine guide vanes to be unable to be driven. In serious cases, it will affect the safe operation of the unit. Summary of the Invention

[0005] In order to solve the technical problem of transmission system jamming caused by upward warping of the control ring, the present invention provides a method for installing a turbine control ring anti-lift device, which is characterized by comprising the following steps:

[0006] Step 1: Install two servomotors on the control ring and determine the pressure difference between the two servomotors.

[0007] Step 2: Determine the generated overturning torque T through the relay differential pressure 翻 ;

[0008] Step 3: According to the flipping torque T 翻 Determine the force F generated at a single platen 压 ;

[0009] Step 4: Determine the force F at the bolt based on the force generated at a single pressure plate.螺 ;

[0010] Step 5: According to the force F at the bolt of a single pressure plate 螺 and the bending stress σ1=(F 螺 / n) / S 螺 , to determine the diameter and number n of bolts on a single pressure plate and install them.

[0011] Preferably, in step 1.1, the pressure generated by the retracting servomotor is: F1 = π / 4 × D 缸 2 ×P;

[0012] Step 1.2, the pressure generated by extending the relay: F2 = π / 4 × (D 缸 -D 杆 ) 2 ×P;

[0013] Step 1.3, the relay generates differential pressure: F 差 =F2-F1.

[0014] Preferably, in step 2, the turning moment T 翻 :T 翻 =F 差 ×H.

[0015] Preferably, in step 3, the force generated on the single pressure plate is: F 压 =(T 翻 / D1) / 2.

[0016] Preferably, in step 4, according to the moment balance principle, the moment of the pressure plate is equal to the moment at the bolt, and the force F at the bolt can be calculated inversely. 螺 :F 螺 =F 压 ×L1 / L2.

[0017] To avoid bolt breakage, in step 5, the bending stress σ1 borne by a single bolt does not exceed its yield strength σ s 1 / 3: σ1=(F 螺 / n) / S 螺 >1 / 3×σ s .

[0018] The present invention has the following beneficial effects:

[0019] 1. When the servomotor moves in the closing direction, due to the different force-bearing areas of the two servomotors, the servomotor exerts a relatively large combined force in the +X direction on the control ring. The unbalanced force generated during the opening and closing of the left and right servomotors is transmitted to the large ear hole of the control ring through the push-pull rod, and then the force is transmitted to the small ear hole of the control ring through the control ring body. Due to the height difference between the large ear hole and the small ear hole of the control ring, the force will generate a torque that causes the control ring to lift up with the anti-lift device as the fulcrum. The present invention can accurately find the reverse torque, thereby inversely calculating the force at the anti-lift device, determining the need to suppress the lifting force of the control ring, and determining the installation of the bolts based on the lifting force to ensure safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an embodiment of a method for installing a hydraulic turbine control ring anti-lift device according to the present invention;

[0021] Figure 2 is a schematic diagram of the relay switch status;

[0022] Figure 3 is a schematic diagram of a relay;

[0023] Figure 4 is a schematic diagram of the relay and control loop;

[0024] Figure 5 for Figure 4 A partial enlarged view of the

[0025] Figure 6 This is a schematic diagram of the installation position of the pressure plate;

[0026] Figure 7 This is a schematic diagram of the pressure plate installation structure. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] 1. The reference numerals in the drawings of the specification include: servomotor 1, control ring 2, pressure plate 3, pressure plate position 4, bolt 5, control ring large ear hole 6, control ring large ear hole 7.

[0029] Example 1

[0030] like Figure 1-7 As shown, a method for installing a turbine control ring anti-lift device includes the following steps:

[0031] Step 1: Install two servomotors on the control ring 2. One servomotor is a straight-cylinder, double-chamber, single-rod structure, and the other servomotor with a feedback device is a straight-cylinder, double-chamber, double-rod structure. The operating oil pressure level is 4.0 MPa. Calculate the pressure difference between the two servomotors 1. The two servomotors 1 move in opposite directions; when one retracts, the other extends.

[0032] Step 1.1. Pressure generated by retracting servomotor 1 (the piston rod of servomotor 1 does not occupy the pressure oil space during retraction): F1 = π / 4 × D 缸 2 ×P,D 缸 is the diameter of the internal cylinder of the relay 1, and P is the oil pressure;

[0033] Step 1.2: The pressure generated by extending servomotor 1 (the piston rod of servomotor 1 occupies the pressure oil space during the extension process): F2 = π / 4 × (D 缸 -D 杆 ) 2 ×P,D 杆 is the diameter of the piston rod of servomotor 1, and P is the oil pressure;

[0034] Step 1.3: Relay 1 generates differential pressure (this force is the initial force that causes the control to lift): F 差 =F2-F1;

[0035] Step 2: Calculate the overturning torque T generated by the differential pressure of the servomotor 1 based on the height difference between the pressure plate 3 and the servomotor 1. 翻 :T 翻 =F 差 ×H, H is the height difference between the pressing plate 3 and the servomotor 1;

[0036] Step 3: According to the flipping torque T 翻 Back-calculate the force F generated at pressure plate 3 压 When the servomotor 1 generates a pressure difference, the pressure plates 3 that prevent the control ring 2 from lifting are the two pressure plates 3 on the side of the servomotor 1. The force generated on a single pressure plate 3 is: F 压 =(T 翻 / D1) / 2, D1 is the distance between the contact point between the right pressure plate 3 and the control ring and the bolt of the left pressure plate 3;

[0037] Step 4: Calculate the force F at the bolt 5 based on the force generated at the single pressure plate 3 螺 During the lifting process of the control ring 2, the effective length of the pressure plate 3 is L1; the distance between the bolt 5 and the lifting point of the pressure plate 3 is L2. According to the principle of moment balance, the torque of the pressure plate 3 is equal to the torque at the bolt 5, and the force F at the bolt 5 can be calculated inversely. 螺 :F 压 ×L1=F 螺 ×L2;F 螺 =F 压 ×L1 / L2;

[0038] Step 5: Based on the calculated force F at bolt 5 of single pressure plate 3 螺To determine the diameter and number n of the bolts 5 on the pressure plate 3, the requirement is to ensure that the bending stress borne by a single bolt 5 does not exceed its yield strength σ s 1 / 3 of the stress of a single bolt 5 is sufficient: σ1=(F 螺 / n) / S 螺 >1 / 3×σ s , install bolts 5 on each pressure plate 3.

[0039] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for installing a turbine control ring anti-lift device, characterized in that: The following steps are involved: Step 1: Install two servomotors on the control ring and determine the pressure difference between the two servomotors. Step 1.1, pressure generated by retracting the servomotor: F1 = π / 4 × D 缸 2 ×P; Step 1.2, the pressure generated by extending the relay: F2 = π / 4 × (D 缸 -D 杆 ) 2 ×P; Step 1.3, the relay generates differential pressure: F 差 =F2-F1; Step 2: Determine the generated overturning torque T through the relay differential pressure 翻 =F 差 ×H; Step 3: According to the flipping torque T 翻 Determine the force F generated at a single platen 压 =(T 翻 / D1) / 2; Step 4: Determine the force F at the bolt based on the force generated at a single pressure plate. 螺 According to the principle of moment balance, the moment of the pressure plate is equal to the moment at the bolt, and the force F at the bolt can be calculated inversely. 螺 :F 压 ×L1=F 螺 ×L2; Step 5: According to the force F at the bolt of a single pressure plate 螺 and the bending stress σ1=(F 螺 / n) / S 螺 , the bending stress σ1 borne by a single bolt does not exceed its yield strength σ s 1 / 3: σ1=(F 螺 / n) / S 螺 >1 / 3×σ s , to determine the diameter and number n of bolts on a single pressure plate and install them.

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