Installation method for water distribution ring pipe of impulse turbine

Abstract

The invention discloses a mounting method for a water distribution ring pipe of an impulse turbine, and relates to the technical field of water turbines. Comprising the following steps: determining a runner pitch circle; the Z axis coincides with the circle center of the rotating wheel pitch circle; determining a rotating surface; determining a positioning surface; determining a positioning basis; setting a plurality of positioning lines; mounting a fork pipe, wherein the center of an outlet flange of the fork pipe is on a corresponding positioning line; determining the mounting angle of the fork pipe; the distance between the end surface of the outlet flange and the positioning surface is equal to a theoretical value; fixing the fork pipe; the steps are repeated until all the fork pipes are fixed; all straight pipes of the water distribution ring pipe are placed and fixed, and installation of the water distribution ring pipe is completed; when the straight pipe and the fork pipe are welded, due to existence of welding stress, the end face and the positioning face of the outlet flange need to be continuously measured to ensure that the end face and the positioning face of the outlet flange are parallel and the distance is equal to a theoretical value. The problem that the water distribution ring pipe is inconvenient to mount and measure due to the size and the weight of the impulse turbine can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, in particular to an installation method for a water distribution ring pipe of an impulse water turbine. Background Art

[0002] The water distribution ring pipe is an important flow component of the multi-nozzle impulse turbine. Its installation accuracy deviation directly affects the rotation efficiency and unit vibration of the impulse turbine. Taking the 6-nozzle impulse unit as an example, the installation of the water distribution ring pipe must first ensure that the centers of the 6 outlet flanges of the water distribution ring pipe are at the tangent point of the same impeller pitch circle, and their tangent points are evenly distributed on the impeller pitch circle; secondly, the elevation of the center of the 6 outlet flanges of the water distribution ring pipe is equal to the elevation of the bucket water dividing blade; Figure 1 shown.

[0003] If the centers of the six flanges of the water distribution ring pipe are not on the same tangent point of the runner pitch circle, or on the same tangent point of the runner pitch circle but not divided into six equal parts, unbalanced forces will inevitably be generated during the operation of the runner, affecting the operating efficiency of the turbine. At the same time, the bearing shells of the turbine guide bearings will be unevenly stressed, causing vibrations and affecting the safe life of the turbine. If the center of the jet cannot be directly opposite to the elevation of the bucket water dividing blade, the water flow will cause a large torque on the upper and lower working surfaces of the bucket, causing vibrations in the unit. In severe cases, the bucket will crack and be damaged due to torsional fatigue. It can be seen that the installation measurement accuracy of the water distribution ring pipe, which is the foundation of the impulse turbine, is extremely important and is the core benchmark work for the installation of the unit.

[0004] At present, the tools used for on-site installation of the water distribution ring pipe are a set of dummy runner tools and various dimensional data of the water distribution ring pipe flange, which are measured and installed by measuring rods. Although this tool is simple and convenient, it is only suitable for small and medium-sized impulse turbines. For large and giant impulse turbine units, due to the increase in space size and weight, it is extremely inconvenient to use the dummy runner and various dimensional data of the water distribution ring pipe flange for installation and adjustment, and it is difficult to meet the requirements for installation accuracy during design. Summary of the invention

[0005] The object of the present invention is to provide a method for installing a water distribution ring pipe of an impulse turbine in order to solve the problem of inconvenience in installing and measuring the water distribution ring pipe of the impulse turbine due to its size and weight.

[0006] The technical solution adopted by the present invention is as follows: A method for installing a water distribution ring pipe of an impulse turbine comprises the following steps: S1: Determine the positioning conditions for installing the water distribution ring pipe, including steps S11 to S15; S11: Determine the center of the runner pitch circle on the center line of the unit, and determine the radius of the runner pitch circle according to the design requirements; make the Z axis coincide with the center of the runner pitch circle; S12: determining a rotating surface, wherein the elevation of the rotating surface on the Z axis is equal to the elevation of the water bucket dividing blade on the Z axis; S13: determining a positioning surface, wherein a normal vector of the positioning surface is tangent to the pitch circle of the runner; S14: Determine the positioning basis, and use the axis of the unit as the positioning basis; S15: Setting the positioning line, taking the Z axis as the rotation axis and the positioning base as the starting point, setting multiple positioning lines circumferentially on the rotation surface, and the center of the outlet flange of a water distribution ring pipe corresponds to one positioning line; S2: installing the water distribution ring pipe with the positioning condition as a constraint; including steps S21 to S25; S21: Install a fork pipe of a water distribution ring pipe, and the center of the outlet flange of the fork pipe is on the corresponding positioning line; S22: Determine the installation angle of the fork tube in a posture where the end face of the outlet flange is parallel to the positioning surface; S23: Adjust the distance between the end face of the outlet flange and the positioning surface according to the design so that the distance between the end face of the outlet flange and the positioning surface is equal to the theoretical value; S24: fixed fork tube; S25: Repeat steps S21 to S24 until all the fork pipes of the water distribution ring pipes are fixed; S26: According to the position of the fork pipe, place the straight pipe of the water distribution ring pipe, and weld the straight pipe and the fork pipe into a whole, until all the straight pipes are installed, that is, the installation of the water distribution ring pipe is completed; S27: In step S26, when the straight pipe and the fork pipe are welded, due to the existence of welding stress, it is necessary to continuously measure the end face and the positioning surface of the outlet flange to ensure that the end face and the positioning surface of the outlet flange are parallel and the distance is equal to the theoretical value.

[0007] Further, an installation measurement device is applied, the installation measurement device comprises a measurement mechanism and a measurement positioning plate; wherein: The measuring mechanism comprises a base, on which a horizontal adjustment mechanism is provided; a support column is installed on the base, the axis of the support column is perpendicular to the surface of the base and the axis of the support column is collinear with the center line of the base; a measuring arm is rotatably connected to the support column, and the rotation axis of the measuring arm is collinear with the axis of the support column; and a positioning assembly matching the centers of multiple outlet flanges and a first adjustment mechanism for adjusting the center line elevation of the measuring arm are provided between the measuring arm and the support column, so that the center line elevation of the measuring arm is equal to the elevation of the water bucket dividing blade; The measuring positioning plate is installed on the outlet flange, and has a B surface parallel to the end surface of the outlet flange, and has a point B on the B surface that coincides with the center of the outlet flange. The end of the measuring arm away from the support column has a triangular prism, and the first side surface of the triangular prism is fixed on the measuring arm. The side line of the triangular prism directly opposite to the first side surface is called the first side line (1101), and the first side line (1101) intersects and is perpendicular to the axis of the measuring arm; a measuring plate is installed on the triangular prism, and the measuring plate has an A surface, and the A surface is parallel to the rotation axis of the measuring arm, and the angle α between the A surface and the center line of the measuring arm is equal to the angle β between the center line of the measuring arm and the radial direction where the corresponding tangent point on the rotor pitch circle is located, wherein n is the number of water distribution ring pipes to be assembled, and the upper end of the A surface has an A side, and the intersection of the A side and the first side line (1101) is point A; a second adjustment mechanism is provided between the triangular prism and the measuring plate to adjust the elevation of the A side; In step S11, the center line of the base is adjusted to be collinear with the center line of the unit by using the horizontal adjustment mechanism; the axis of the support column is used as the Z axis; In step S12, the centerline elevation of the measuring arm is adjusted by the first adjustment mechanism so that the centerline elevation of the measuring arm is equal to the elevation of the bucket water dividing blade, and the surface swept by the measuring arm is used as the rotating surface; In step S13, the positioning surface is determined by the A surface, and the B surface is parallel to the A surface during installation; In step S14 and step S15, a plurality of positioning lines are determined by the positioning assembly; a first adjusting mechanism for adjusting the centerline elevation of the measuring arm In step S23, the distance between the end face of the outlet flange and the positioning surface is adjusted by adjusting the distance between point B and point A.

[0008] Furthermore, the horizontal adjustment mechanism includes a base for fixing on the water stabilizing grid, the outer side of the base has a plurality of fixing plates, the base is placed on the base and is located between the plurality of fixing plates; a center adjustment screw is threadedly connected to the fixing plate, one end of the center adjustment screw passes through the fixing plate and abuts against the outer side of the base; a plurality of horizontal adjustment screws are threadedly connected to the base, the plurality of horizontal adjustment screws are circumferentially distributed, one end of the horizontal adjustment screw passes through the base and abuts against the upper surface of the base.

[0009] Furthermore, the base is also provided with a through hole, and a coupling bolt passes through the through hole to couple the base with the pedestal; the inner diameter of the through hole is larger than the diameter of the screw in the coupling bolt.

[0010] Furthermore, a rotating cylinder is provided in the middle of the measuring arm, and the rotating cylinder is rotatably connected to the supporting column via a shaft sleeve.

[0011] Further, the positioning assembly includes a first positioning mechanism; the first positioning mechanism includes a false wheel rotatably connected to the support column, a first positioning plate is fixed to the lower end surface of the false wheel, and the first positioning plate is fixed to the support column after coinciding with the axis of the unit; In step S14, a positioning base is determined by a first positioning plate.

[0012] Further, the positioning assembly further comprises a second positioning mechanism, the second positioning mechanism comprising a plurality of positioning grooves arranged on the false rotating wheel and a second positioning plate fixed on the rotating drum; the plurality of positioning grooves are circumferentially distributed and the distribution positions match the installation positions of the outlet flange, there is a third positioning plate engaged with the second positioning plate, and the third positioning plate can be embedded in the positioning groove, so that the rotation angle of the rotating drum is limited by the positioning groove; In step S15, the circumferential position of the positioning line is determined by the circumferentially distributed positions of the positioning grooves.

[0013] Furthermore, the first adjustment mechanism is a lower spacer, the support column is provided with a step surface, the lower spacer is installed between the rotary drum and the step surface, and the support column rotatably supports the rotary drum through the lower spacer; In step S12, the elevation of the rotating surface on the Z axis is determined to be equal to the elevation of the bucket water-dividing blade on the Z axis through the lower spacer.

[0014] Furthermore, it also includes an upper spacer sleeve, which is sleeved on the support column and located above the rotary drum. The rotary drum is restricted by the upper spacer sleeve, and a pressure plate is provided on the top of the upper spacer sleeve, and the pressure plate is locked with the support column by screws.

[0015] Furthermore, the second adjustment mechanism includes a strip hole arranged on the triangular prism, which is slidably connected to the measuring plate; an adjustment plate is fixed on the measuring arm, a measuring adjustment screw is threadedly connected to the adjustment plate, and one end of the measuring adjustment screw is rotatably connected to the measuring plate.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention can solve the problem of inconvenience in installation and measurement of water distribution ring pipes of large and giant impulse turbines due to the increase in space size and weight.

[0017] 2. The present invention only needs to adjust the second positioning mechanism in the positioning assembly to install different water distribution ring pipe sections, which not only improves the installation measurement accuracy but also reduces the installation time; 3. The present invention can not only be used for the hoisting of the water distribution ring pipe, but also for the on-site welding, pressurization and real-time monitoring of the pressure-maintaining pouring of the water distribution ring pipe, which greatly improves the installation accuracy of the water distribution ring pipe. 4. The invention has horizontal adjustment, which can conveniently and quickly adjust the installed measuring device to the center line of the unit. By processing the length of the spacer on site, the elevation of the measuring arm is ensured to be located at the center of the bucket water dividing blade; finally, the measuring plate is adjusted by the adjusting bolt of the measuring module to eliminate the error caused by the deformation of the long arm due to the large spatial size, thereby greatly improving the measurement accuracy of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will now be described by way of example with reference to the accompanying drawings, in which: Figure 1 A top view schematic diagram of installing a water distribution ring pipe segment using the installation and measurement device disclosed in the present invention; Figure 2 It is a front view structural schematic diagram of the installation and measurement device disclosed in the present invention; Figure 3 Schematic diagram of the relationship between the angle α and the angle β; Figure 4 It is a schematic diagram of the top view of the structure of the installation and measurement device disclosed in the present invention; Figure 5 for Figure 4 The enlarged schematic diagram of point I in the middle; Figure 6 for Figure 5 Middle P view; Figure 7 is a schematic diagram of the structure of the base; Figure 8 is a structural schematic diagram of the positioning assembly; Fig. 9 for Figure 8 The enlarged schematic diagram of II in the middle; Fig.10 for Figure 8 Enlarged schematic diagram of point III Markings in the figure: 1- water distribution ring pipe joint; 111- straight pipe; 122- fork pipe; 2- outlet flange; 3- base; 4- support column; 5- rotary cylinder; 6- measuring arm; 7- measuring plate; 8- measuring positioning plate; 9- counterweight; 10- fake rotor; 101- positioning groove; 11- triangular prism; 1101- first edge line; 12- adjusting plate; 13- bar hole; 14- measuring adjusting screw; 15- base; 16- fixing plate; 17- center adjusting screw; 18- horizontal adjusting screw; 19- closing bolt; 20- first positioning plate; 21- third positioning plate; 22- second positioning plate; 23- pressure plate; 24- upper spacer; 25- shaft sleeve; 26- lower spacer; 27- step surface; 28- rotor pitch circle. DETAILED DESCRIPTION

[0019] In the description of this specification, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of this specification is usually placed when used. It is only for the convenience of describing this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this specification.

[0020] In addition, if the terms "horizontal" or "vertical" appear in the description of this specification, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0021] In the description of this specification, it should also be noted that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be a connection between the internal parts of two elements.

[0022] In this manual, elevation refers to the dimension on the Z axis. Example 1 A method for installing a water distribution ring pipe of an impulse turbine comprises the following steps: S1: Determine the positioning conditions for installing the water distribution ring pipe, including steps S11 to S15; S11: Determine the center of the runner pitch circle on the center line of the unit, and determine the radius of the runner pitch circle according to the design requirements; make the Z axis coincide with the center of the runner pitch circle; S12: determining a rotating surface, wherein the elevation of the rotating surface on the Z axis is equal to the elevation of the water bucket dividing blade on the Z axis; S13: determining a positioning surface, wherein a normal vector of the positioning surface is tangent to the pitch circle of the runner; S14: Determine the positioning basis, and use the axis of the unit as the positioning basis; S15: Setting the positioning line, taking the Z axis as the rotation axis and the positioning base as the starting point, setting multiple positioning lines circumferentially on the rotation surface, and the center of the outlet flange of a water distribution ring pipe corresponds to one positioning line; S2: installing the water distribution ring pipe with the positioning condition as a constraint; including steps S21 to S25; S21: Install a fork pipe of a water distribution ring pipe, and the center of the outlet flange of the fork pipe is on the corresponding positioning line. The water distribution ring pipe has a fork pipe 122 and a straight pipe 111. The installation of the water distribution ring pipe is mainly to ensure that the position of the fork pipe 122 is accurate; the center of the outlet flange is on the corresponding positioning line, that is, the center line of the fork pipe 122 is on the corresponding positioning line; S22: Determine the installation angle of the fork tube with the end face of the outlet flange parallel to the positioning surface; as for how to determine that the end face of the outlet flange is parallel to the positioning surface, two points can be randomly selected on the end face of the outlet flange, and the distances between the two points and the positioning surface are equal, then the end face of the outlet flange is parallel to the positioning surface; S23: adjusting the distance between the end face of the outlet flange and the positioning surface according to the design, and making the distance between the end face of the outlet flange and the positioning surface equal to the theoretical value, that is, determining the position and angle of the fork tube 122; S24: fixed fork tube; S25: Repeat steps S21 to S24 until all fork tubes are fixed; S26: according to the position of the fork pipe, place the straight pipe of the water distribution ring pipe, and weld the straight pipe and the fork pipe into a whole, until all the straight pipes are installed, that is, the installation of the water distribution ring pipe is completed; S27: In step S26, when fixing the water distribution ring pipe, it is necessary to fix the straight pipe 111 and the fork pipe 122, that is, to fix the straight pipe 111 and the fork pipe 122 by welding; since welding stress causes deformation during welding, it is necessary to continuously measure the end face and the positioning surface of the outlet flange during welding to ensure that the error of parallelism and distance between the end face and the positioning surface of the outlet flange is within the allowable range, so that the position and angle of the fork pipe 122 after installation are consistent with the design.

[0023] Example 2 like Figure 1-Figure 10 As shown, a device for installing and measuring a water distribution ring pipe of an impulse turbine comprises a measuring mechanism and a measuring positioning plate 8; wherein: In this embodiment, the measuring mechanism includes a base 3, and a horizontal adjustment mechanism on the base 3; the horizontal adjustment mechanism has two functions, one is to adjust the center line of the base 3 to be collinear with the center line of the unit, and the other is to adjust the base 3 to a horizontal state; it should be noted that when adjusting the base 3 to a horizontal state, it is easy to cause the center line of the base 3 to deviate, so the above two functions need to cooperate with each other to adjust the base 3 to a horizontal state, and the center line of the base 3 to be collinear with the center line of the unit. Adjusting the state and position of the base 3 is equivalent to determining the center point of the installation of multiple water distribution ring pipes, that is, the origin, which is also on the same Z axis as the center of the runner pitch circle 28.

[0024] In this embodiment, a support column 4 is installed on the base 3, the axis of the support column 4 is perpendicular to the surface of the base 3 and the axis of the support column 4 is collinear with the center line of the base 3, that is, the axis of the support column 4 is equivalent to the Z axis; a measuring arm is rotatably connected to the support column 4, and the rotation axis of the measuring arm is collinear with the axis of the support column 4, that is, the measuring arm actually rotates around the Z axis.

[0025] Furthermore, the measuring arm is a frame structure, the middle part of which is rotatably connected to the support column 4; the support column 4 divides the measuring arm into a long arm and a short arm, and one end of the short arm has a counterweight 9 so that the center of gravity of the measuring arm is located on the rotation axis of the measuring arm, that is, on the Z axis.

[0026] In this embodiment, there is a positioning assembly between the measuring arm and the support column 4 that matches the center of multiple outlet flanges 2. On the one hand, the positioning assembly positions the axis of the unit, which is equivalent to positioning the X-axis for the installation of the unit; on the other hand, it positions the circumferential position of each outlet flange 2 of the water distribution ring pipe, that is, it positions the outlet flange 2 in the XY plane.

[0027] In this embodiment, a first adjusting mechanism for adjusting the centerline elevation of the measuring arm is provided between the measuring arm and the support column 4. The first adjusting mechanism adjusts the height of the centerline of the measuring arm so that the centerline elevation of the measuring arm is equal to the elevation of the bucket water-dividing blade. It should be noted that the elevation is the dimension on the Z-axis, and the centerline elevation of the measuring arm is equal to the elevation of the bucket water-dividing blade (that is, the installation elevation of the turbine) to ensure that the installation elevation of the water distribution ring pipe (including the outlet flange 2) matches the elevation of the bucket water-dividing blade.

[0028] In this embodiment, the measuring positioning plate 8 can be installed on the outlet flange 2, and the measuring positioning plate 8 has a B surface parallel to the end face of the outlet flange 2, and the B surface has a point B that coincides with the center of the outlet flange 2, that is, the end face and center of the outlet flange 2 are converted to the measuring positioning plate 8; further, the measuring positioning plate 8 is provided with a stopper that matches the size of the outlet flange 2.

[0029] In this embodiment, the end of the measuring arm 6 away from the support column 4 (i.e., the end of the long arm) has a triangular prism 11, the first side surface of the triangular prism 11 is fixed to the measuring arm 6, and the side line of the triangular prism 11 opposite to the first side surface is called the first side line (1101), and the first side line (1101) intersects and is perpendicular to the axis of the measuring arm; a measuring plate 7 is installed on the triangular prism 11, and the measuring plate 7 has an A surface as a positioning surface, and the A surface is parallel to the rotation axis of the measuring arm, and the A surface is perpendicular to the center line of the measuring arm. The angle α is equal to the angle β between the center line of the measuring arm and the radial direction of the corresponding tangent point on the runner pitch circle 28. When installing the outlet flange 2 of the water distribution ring pipe, the B surface needs to be parallel to the A surface, so that the spray water flowing out of the outlet flange 2 (nozzle) can be tangent to the runner pitch circle 28; the upper end of the A surface has an A edge, and the intersection of the A edge and the first edge line (1101) is point A. The distance between point A and point B is determined, thereby determining the distance from the outlet flange 2 (nozzle) to the corresponding tangent point on the runner pitch circle 28.

[0030] In this embodiment, a second adjustment mechanism is provided between the triangular prism 11 and the measuring plate 7 to adjust the elevation of side A, that is, to make the measuring plate 7 move along the direction of the Z axis to eliminate the error caused by the deformation of the long arm due to gravity, so that the elevation of point A is equal to the elevation of the bucket water-dividing blade, that is, to satisfy the satisfaction that the centerline elevation of the measuring arm is equal to the elevation of the bucket water-dividing blade.

[0031] In summary, the installation position of the water distribution ring pipe segment 1 can be determined by positioning the Z axis, X axis and circumferential direction; the installation angle of the water distribution ring pipe segment (outlet flange 2) can be determined by matching the A surface with the B surface; the distance between the installation position of the water distribution ring pipe segment (outlet flange 2) and the runner pitch circle 28 can be determined by controlling the distance between point A and point B; the determination of the above positions, angles and distances can effectively solve the problem of inconvenient installation and measurement of the water distribution ring pipe caused by the increase in space size and weight of large and giant impulse turbines.

[0032] Example 3 Based on Example 2, a specific implementation method that can be implemented is further proposed.

[0033] A feasible implementation manner, the horizontal adjustment mechanism includes a base 15, and when the water distribution ring pipe section is installed, the base 15 can be fixed on the water stabilizing grid; the outer side of the base 15 has a plurality of fixing plates 16, and the base 3 is placed on the base 15 and is located between the plurality of fixing plates 16; a center adjustment screw 17 is threadedly connected to the fixing plate 16, and one end of the center adjustment screw 17 passes through the fixing plate 16 and abuts against the outer side of the base 3, and screwing the center adjustment screw 17 can push the base 3 to move, thereby changing the position of the center line of the base 3, and then making the center line of the base 3 collinear with the center line of the unit, that is, the center line of the base 3 is collinear with the center of the impeller pitch circle 28.

[0034] Furthermore, a plurality of horizontal adjustment screws 18 are threadedly connected to the base 3, and the plurality of horizontal adjustment screws 18 are distributed circumferentially. One end of the horizontal adjustment screw 18 passes through the base 3 and abuts against the upper surface of the base 15. Turning the horizontal adjustment screw 18 can change the height of the corresponding position on the base 3 in the Z direction. With the combination of the plurality of horizontal adjustment screws 18, the base 3 can be effectively adjusted to a horizontal state, ensuring that the entire installation and measurement device does not tilt, thereby improving the installation and measurement accuracy of the water distribution ring pipe segment 1.

[0035] Furthermore, a through hole is provided on the base 3, and a bolt 19 is passed through the through hole to couple the base 3 with the base 15; by coupling the base 3 and the base 15 with the bolt 19, the connection stability between the base 3 and the base 15 is improved, and the possibility of the position of the base 3 changing when the water distribution ring pipe joint 1 is installed is reduced.

[0036] Furthermore, the inner diameter of the through hole is larger than the diameter of the screw in the engaging bolt 19 , so that the engaging bolt 19 will not interfere with the adjustment of the horizontal state and the center line position of the base 3 .

[0037] Example 4 Based on any one of the implementations in Examples 2-3, a feasible specific implementation is further proposed.

[0038] In a feasible implementation manner, a rotating cylinder 5 is provided in the middle of the measuring arm, and the rotating cylinder 5 is rotatably connected to the supporting column 4 via a shaft sleeve 25, thereby improving the stability of the rotatable connection between the measuring arm and the supporting column 4.

[0039] A feasible implementation manner, the positioning assembly includes a first positioning mechanism, which positions the X-axis installed on the unit, that is, the axis of the unit; specifically, the first positioning mechanism includes a dummy wheel 10, which is rotatably connected to the support column 4, and a first positioning plate 20 is fixed to the lower end of the dummy wheel 10, and the dummy wheel 10 is rotatably connected to adjust the circumferential position of the first positioning plate 20 so that the first positioning plate 20 can coincide with the axis of the unit; after the first positioning plate 20 coincides with the axis of the unit, the first positioning plate 20 is fixed to the support column 4, thereby fixing the dummy wheel 10.

[0040] In a feasible implementation, the positioning assembly also includes a second positioning mechanism, which includes a plurality of positioning grooves 101 arranged on the false wheel 10 and a second positioning plate 22 fixed on the rotary drum 5; the plurality of positioning grooves 101 are distributed circumferentially and the distribution position matches the installation position of the outlet flange 2, there is a third positioning plate 21 that is engaged with the second positioning plate 22, and the third positioning plate 21 can be embedded in the positioning groove 101, so that the rotation angle of the rotary drum 5 is limited by the positioning groove 101; the false wheel 10 is fixed with the first positioning plate 20, which actually determines the position of the positioning groove 101 in the circumferential distribution based on the axis of the unit. Specifically, when a water distribution ring pipe segment 1 needs to be installed, it is only necessary to embed the third positioning plate 21 into the corresponding positioning groove 101, and then the rotating measuring arm rotary drum 5 will also rotate, so that the second positioning plate 22 is attached to the third positioning plate 21, and then the third positioning and second positioning plates 22 are engaged, so that the installation and positioning of the water distribution ring pipe segment 1 can be realized.

[0041] Example 5 On the basis of the existence of the rotary drum 5, on the basis of any one of the implementations in Examples 2-4, a feasible specific implementation is further proposed.

[0042] A feasible implementation method is that the first adjustment mechanism is a lower spacer 26, and a step surface 27 is provided on the support column 4. The distance between the step surface 27 and the elevation of the bucket water-dividing blade on the Z-axis is measured, and the length of the lower spacer 26 is processed according to the distance; and the lower spacer 26 is installed between the rotating drum 5 and the step surface 27, and the support column 4 rotatably supports the rotating drum 5 through the lower spacer 26; the center line elevation of the measuring arm can be made equal to the elevation of the bucket water-dividing blade, that is, the installation position of the water distribution ring pipe segment 1 on the Z-axis is determined.

[0043] A feasible implementation manner further includes an upper spacer 24, which is sleeved on the support column 4 and located above the rotating cylinder 5. The rotating cylinder 5 is restricted by the upper spacer 24, and a pressure plate 23 is provided on the top of the upper spacer 24. The pressure plate 23 and the support column 4 are locked by screws. The upper spacer 24 is fixed by screws, so that the upper spacer 24 can constrain the rotating cylinder 5 and ensure that the centerline elevation of the measuring arm will not change after rotation.

[0044] Example 5 Based on any one of the implementations in Examples 2-5, a feasible specific implementation is further proposed.

[0045] The second adjustment mechanism includes a strip hole 13 provided on the triangular prism 11, the length direction of the strip hole 13 is along the Z direction, and the measuring plate 7 is slidably connected to the strip hole 13, so that the elevation of the measuring plate 7 can be adjusted, and the elevation of the A side can be further adjusted, thereby adjusting the elevation of point A, so that point A and point B are on the same horizontal plane. Specifically, an adjustment plate 12 is fixed on the measuring arm, and the adjustment plate 12 can actually be fixed on the triangular prism 11; a measurement adjustment screw 14 is threadedly connected to the adjustment plate 12, and one end of the measurement adjustment screw 14 is rotatably connected to the measuring plate 7. By rotating the measurement adjustment screw 14, the measurement plate 7 can be moved, thereby adjusting the position of the measurement plate 7.

[0046] In summary, in step S11, the center line of the base 3 is adjusted to be collinear with the center line of the unit by using the horizontal adjustment mechanism; the axis of the support column 4 is used as the Z axis; In step S12, the centerline elevation of the measuring arm is adjusted by the first adjustment mechanism so that the centerline elevation of the measuring arm is equal to the elevation of the bucket water dividing blade, and the surface swept by the measuring arm is used as the rotating surface; Specifically, in step S12, the lower spacer 26 is used to determine that the elevation of the rotating surface on the Z axis is equal to the elevation of the bucket water-dividing blade on the Z axis.

[0047] In step S13, the positioning surface is determined by the A surface, and the B surface is parallel to the A surface during installation.

[0048] In step S14 and step S15, a plurality of positioning lines are determined by the positioning assembly; a first adjusting mechanism for adjusting the centerline elevation of the measuring arm; specifically, In step S14, a positioning base is determined by a first positioning plate; In step S15, the circumferential position of the positioning line is determined by the circumferentially distributed positions of the positioning grooves 101, and the actual positioning line is the center line of the measuring arm.

[0049] In step S23, the distance between the end face of the outlet flange and the positioning surface is adjusted by adjusting the distance between point B and point A.

[0050] Furthermore, using the installation measuring device, a method for installing a water distribution ring pipe of an impulse turbine is specifically as follows: Step 1: Install the base 15 on the water stabilizing grid, and adjust the base 3 to a horizontal state through the center adjustment screw 17 and the horizontal adjustment screw 18, and the center line of the base 3 is collinear with the center line of the unit, and the origin of the installation is determined, which is equivalent to determining the center of the runner pitch circle 28 and the Z-axis position; Step 2: Install the support column 4 on the base 3; Step 3: Install the dummy wheel 10 on the support column 4, rotate the dummy wheel 10 so that the first positioning plate 20 coincides with the axis of the unit, and then fix the first positioning plate 20 on the support column 4. The dummy wheel 10 is positioned and fixed, and the position of the positioning groove 101 in the circumferential direction is determined based on the axis of the unit; Step 4: Measure the distance between the step surface 27 on the support column 4 and the elevation of the bucket water dividing blade on the Z axis, and process the lower spacer 26; install the lower spacer 26 so that the centerline elevation of the measuring arm is equal to the elevation of the bucket water dividing blade; Step 5: Install the triangular prism, measuring plate 7 and rotating drum 5 on the measuring arm, and use the lifting device to install the measuring arm on the supporting column 4, with the lower spacer 26 supporting the rotating drum 5; then install the upper spacer 24 and lock the rotating drum 5; Step 6: Insert the third positioning plate 21 into the positioning groove 101, rotate the measuring arm to fit the second positioning plate 22, and fix the second positioning plate 22 and the third positioning plate 21; Step 7: Measure the elevation of side A, and adjust the measuring adjustment screw 14 so that the elevation of side A is equal to the elevation of the water bucket dividing blade; Step 8: Install the measuring positioning plate 8 on the end face of the outlet flange 2 of the fork pipe to be installed; Step 9: Lift the fork tube to be installed, and adjust the fork tube so that surface B is parallel to surface A. When determining that surface B is parallel to surface A, you can select any two points on surface B. If the distances from the two points to surface A are equal, then surface B is parallel to surface A, that is, the end face of the outlet flange is parallel to the positioning surface. Step 10: Then measure the distance from point B to point A to determine whether the distance meets the design requirements; when determining the distance from point B to point A, it is actually to determine whether the distance from surface B to surface A meets the design requirements. If the design requirements are met, repeat steps 6 to 9 to install the next water distribution ring pipe segment; when performing step 6, it is necessary to replace another positioning groove 101; until all water distribution ring pipe segments are installed; it should be noted that when installing the water distribution ring pipe, the water distribution ring pipe has a fork pipe 122 and a straight pipe 111. The installation of the water distribution ring pipe is mainly to determine the accurate position of the fork pipe 122, that is, to ensure that the center line of the fork pipe 122 is on the corresponding positioning line; at the same time, when fixing the water distribution ring pipe, it is necessary to fix the straight pipe 111 and the fork pipe 122. That is, the straight pipe 111 and the fork pipe 122 are welded and fixed, and the straight pipe of the water distribution ring pipe is placed according to the position of the fork pipe, and the straight pipe and the fork pipe are welded into a whole until all the straight pipes are installed, that is, the installation of the water distribution ring pipe is completed; since welding stress causes deformation during welding, the end face (B face) and the positioning face (A face) of the outlet flange need to be continuously measured during welding to ensure that the parallelism and distance error between the end face of the outlet flange and the positioning face are within the allowable range, so that the position and angle of the fork pipe 122 after installation are consistent with the design; If the design requirements are not met, proceed to step 9 to continue adjusting the installation position of the water distribution ring pipe joint.

[0051] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A method for installing a water distribution ring pipe of an impulse turbine, characterized in that: The following steps are involved: S1: Determine the positioning conditions for installing the water distribution ring pipe, including steps S11 to S15; S11: Determine the center of the runner pitch circle on the center line of the unit, and determine the radius of the runner pitch circle according to the design requirements; make the Z axis coincide with the center of the runner pitch circle; S12: determining a rotating surface, wherein the elevation of the rotating surface on the Z axis is equal to the elevation of the water bucket dividing blade on the Z axis; S13: determining a positioning surface, wherein a normal vector of the positioning surface is tangent to the pitch circle of the runner; S14: Determine the positioning basis, and use the axis of the unit as the positioning basis; S15: Setting the positioning line, taking the Z axis as the rotation axis and the positioning base as the starting point, setting multiple positioning lines circumferentially on the rotation surface, and the center of the outlet flange of a water distribution ring pipe corresponds to one positioning line; S2: installing the water distribution ring pipe with the positioning condition as a constraint; including steps S21 to S25; S21: Install a fork pipe of a water distribution ring pipe, and the center of the outlet flange of the fork pipe is on the corresponding positioning line; S22: Determine the installation angle of the fork tube in a posture where the end face of the outlet flange is parallel to the positioning surface; S23: Adjust the distance between the end face of the outlet flange and the positioning surface according to the design so that the distance between the end face of the outlet flange and the positioning surface is equal to the theoretical value; S24: fixed fork tube; S25: Repeat steps S21 to S24 until all fork tubes are fixed; S26: according to the position of the fork pipe, place the straight pipe of the water distribution ring pipe, and weld the straight pipe and the fork pipe into a whole, until all the straight pipes are installed, that is, the installation of the water distribution ring pipe is completed; S27: In step S26, when the straight pipe and the fork pipe are welded, due to the existence of welding stress, it is necessary to continuously measure the end face and the positioning surface of the outlet flange to ensure that the end face and the positioning surface of the outlet flange are parallel and the distance is equal to the theoretical value.

2. The installation method according to claim 1, characterized in that: An installation measuring device is applied, the installation measuring device comprising a measuring mechanism and a measuring positioning plate (8); wherein: The measuring mechanism comprises a base (3), the base (3) being provided with a horizontal adjustment mechanism; a support column (4) being mounted on the base (3), the axis of the support column (4) being perpendicular to the surface of the base (3) and the axis of the support column (4) being collinear with the center line of the base (3); a measuring arm being rotatably connected to the support column (4), the rotation axis of the measuring arm being collinear with the axis of the support column (4); and a positioning assembly matching the centers of a plurality of outlet flanges (2) and a first adjustment mechanism for adjusting the center line elevation of the measuring arm so that the center line elevation of the measuring arm is equal to the elevation of the water bucket dividing blade; The measuring positioning plate (8) is mounted on the outlet flange (2), the measuring positioning plate (8) has a B surface parallel to the end surface of the outlet flange (2), the B surface has a point B coincident with the center of the outlet flange (2), the measuring arm (6) has a triangular prism (11) at one end away from the support column (4), the first side surface of the triangular prism (11) is fixed to the measuring arm (6), the side line of the triangular prism (11) opposite to the first side surface is called the first side line (1101), and the first side line (1101) intersects and is perpendicular to the axis of the measuring arm; (11) is mounted with a measuring plate (7), the measuring plate (7) having an A surface as a positioning surface, the A surface being parallel to the rotation axis of the measuring arm, and the angle α between the A surface and the center line of the measuring arm being equal to the angle β between the center line of the measuring arm and the radial direction where the corresponding tangent point on the pitch circle of the runner (28) is located, wherein n is the number of water distribution ring pipes to be assembled, the upper end of the A surface has an A edge, and the intersection of the A edge and the first edge line (1101) is point A; a second adjustment mechanism is provided between the triangular prism (11) and the measuring plate (7) to adjust the elevation of the A edge; In step S11, the center line of the base (3) is adjusted to be colinear with the center line of the unit using a horizontal adjustment mechanism; the axis of the support column (4) is used as the Z axis; In step S12, the centerline elevation of the measuring arm is adjusted by the first adjustment mechanism so that the centerline elevation of the measuring arm is equal to the elevation of the bucket water dividing blade, and the surface swept by the measuring arm is used as the rotating surface; In step S13, the positioning surface is determined by the A surface, and the B surface is parallel to the A surface during installation; In step S14 and step S15, a plurality of positioning lines are determined by the positioning assembly; a first adjusting mechanism for adjusting the centerline elevation of the measuring arm; In step S23, the distance between the end face of the outlet flange and the positioning surface is adjusted by adjusting the distance between point B and point A.

3. The installation method according to claim 2, characterized in that: The horizontal adjustment mechanism comprises a base (15) for fixing on a water stabilizing boom, the outer side of the base (15) having a plurality of fixing plates (16), the base (3) being placed on the base (15) and being located between the plurality of fixing plates (16); a central adjustment screw (17) being threadedly connected to the fixing plate (16), one end of the central adjustment screw (17) passing through the fixing plate (16) and abutting against the outer side of the base (3); a plurality of horizontal adjustment screws (18) being threadedly connected to the base (3), the plurality of horizontal adjustment screws (18) being circumferentially distributed, one end of the horizontal adjustment screw (18) passing through the base (3) and abutting against the upper surface of the base (15).

4. The installation method according to claim 3, characterized in that: The base (3) is also provided with a through hole, through which a coupling bolt (19) passes to couple the base (3) with the pedestal (15); the inner diameter of the through hole is greater than the diameter of the screw in the coupling bolt (19).

5. The installation method according to claim 2, characterized in that: The middle part of the measuring arm is provided with a rotating cylinder (5), and the rotating cylinder (5) is rotatably connected to the supporting column (4) via a shaft sleeve (25).

6. The installation method according to claim 5, characterized in that: The positioning assembly comprises a first positioning mechanism; the first positioning mechanism comprises a dummy wheel (10) rotatably connected to a support column (4); a first positioning plate (20) is fixed to the lower end surface of the dummy wheel (10); the first positioning plate (20) is fixed to the support column (4) after coinciding with the axis of the unit; In step S14, a positioning base is determined by a first positioning plate.

7. The installation method according to claim 6, characterized in that: The positioning assembly further comprises a second positioning mechanism, the second positioning mechanism comprising a plurality of positioning grooves (101) arranged on the dummy wheel (10) and a second positioning plate (22) fixed on the rotary drum (5); the plurality of positioning grooves (101) are circumferentially distributed and the distribution positions match the installation positions of the outlet flange (2); there is a third positioning plate (21) engaged with the second positioning plate (22), and the third positioning plate (21) can be embedded in the positioning grooves (101), so that the rotation angle of the rotary drum (5) is limited by the positioning grooves (101); In step S15, the circumferential position of the positioning line is determined by the circumferentially distributed positions of the positioning grooves (101).

8. The installation method according to claim 5, characterized in that: The first adjustment mechanism is a lower spacer (26), the support column (4) is provided with a step surface (27), the lower spacer (26) is installed between the rotary drum (5) and the step surface (27), and the support column (4) rotatably supports the rotary drum (5) through the lower spacer (26); In step S12, the lower spacer (26) is used to determine that the elevation of the rotating surface on the Z axis is equal to the elevation of the bucket water dividing blade on the Z axis.

9. The installation method according to claim 8, characterized in that: It also includes an upper spacer (24), which is sleeved on the support column (4) and located above the rotary drum (5). The rotary drum (5) is restricted by the upper spacer (24), and a pressure plate (23) is provided on the top of the upper spacer (24). The pressure plate (23) is locked to the support column (4) by screws.

10. The installation method according to claim 2, characterized in that: The second adjustment mechanism comprises a strip hole (13) arranged on the triangular prism (11), the strip hole (13) being slidably connected to the measuring plate (7); an adjustment plate (12) is fixed to the measuring arm (6), a measuring adjustment screw (14) is threadedly connected to the adjustment plate (12), and one end of the measuring adjustment screw (14) is rotatably connected to the measuring plate (7).

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