Spindle push-pull tool and thrust disc assembling method

Abstract

The invention relates to the technical field of expansion machines, and particularly discloses a method for assembling a main shaft push-pull tool and a thrust disc. A bearing seat, an air inlet cylinder, a nozzle ring seat, a nozzle ring, a turbine rotor assembly, an air exhaust cylinder, a first bearing support, a second bearing support, a half coupling, a half coupling locking nut, a push-pull main shaft support, a push-pull main shaft screw and a fixing plate are sequentially arranged. A magnetic micrometer is used for measuring the A value and the B value of the dynamic and static gap value; a thrust disc, a thrust disc key, a thrust disc positioning ring, a thrust disc locking ring and a thrust disc outer locking nut are sequentially mounted on the expansion machine; the magnetic dial indicator is arranged on the end face of the non-coupling end of the main shaft, the measurement size is recorded as C, and the thrust clearance value can be measured. The dynamic and static clearance value of the expansion machine is ensured, dynamic and static clearance deviation caused by machining errors is avoided, and meanwhile the problem that key parts of the expansion machine are difficult to assemble is solved.

Description

Technical Field

[0001] The invention relates to the technical field of expanders, and in particular to an assembly method of a main shaft push-pull tooling and a thrust plate. Background Art

[0002] At present, an organic working fluid expander is a rotary power machine that converts the energy of an organic working fluid into mechanical work, and is mainly used for low-temperature heat recovery and power generation. The thrust plate of the organic working fluid expander is a flat disc-shaped part, which is installed between the thrust bearing and the auxiliary thrust bearing, and is used to bear the axial thrust, so that the axial force is transmitted to the supporting structure along the axis. At the same time, the thrust plate also serves as a speed measuring gear, and cooperates with a speed sensor to measure the speed of the rotor; the size of the dynamic and static clearance is one of the key factors affecting the aerodynamic efficiency of the organic working fluid expander. If the dynamic and static clearance is too large, the aerodynamic efficiency will be greatly reduced; if the dynamic and static clearance is too small, the unit may produce contact wear during operation, increase vibration, and may cause blade breakage, impeller damage, and nozzle partition deformation in severe cases. The size of the thrust clearance is also crucial in the operation of the expander. If the thrust clearance is too large, not only will the axial clearance change of the flow-through part increase when the rotor thrust changes directionally, but it will also have an excessive impact on the thrust pad, and even fail to protect the dynamic and static parts from mutual friction, making the rotor axial position unstable; if the thrust clearance is too small, the friction loss and pad load of the pad will increase.

[0003] In the prior art, the dynamic and static clearance of the flow-through part can be measured by pushing and pulling the main shaft. After the thrust plate and the thrust bearing are installed, the main shaft is pushed and pulled again, and the thrust clearance and the maximum and minimum dynamic and static clearances of the rotor can be measured and calculated.

[0004] However, in the prior art, for large units, the push and pull of the main shaft is performed only by manpower, which is not only difficult but also requires multiple people to operate, which is easy to cause damage to the radial bearing, etc., and the measurement results are unstable and inaccurate. Summary of the invention

[0005] The purpose of the present invention is to provide a spindle push-pull tooling and thrust plate assembly method, aiming to solve the technical problems in the prior art that the spindle of a large unit is pushed and pulled only by manpower, which is not only difficult to work, but also requires multiple people to operate, easily causing damage to radial bearings, etc., and the measurement results are unstable and inaccurate.

[0006] To achieve the above object, the present invention adopts a method for assembling a main shaft push-pull tool and a thrust plate, comprising the following steps: Step 1: Install the expander in order, including the bearing seat, intake cylinder, nozzle ring seat, nozzle ring, turbine rotor assembly, exhaust cylinder, first bearing support, second bearing support, half coupling, half coupling locking nut, push-pull spindle bracket, push-pull spindle screw and fixing plate; Step 2: Use a magnetic micrometer to measure the A and B values ​​of the dynamic and static clearances; Step 3: Install the thrust plate, thrust plate key, thrust plate locating ring, thrust plate locking ring and thrust plate outer locking nut on the expander in sequence; Step 4: Place the magnetic micrometer on the non-connected end face of the spindle, push the spindle toward the non-connected end by rotating the nut, record the measured dimension as C, calculate the dynamic and static clearances between the connected end and the non-connected end, push and pull the spindle back and forth, and measure the thrust clearance value, which is the difference between the maximum and minimum values.

[0007] Among them, in the step one, first assemble the bearing seat and the intake cylinder of the expander, and then assemble the nozzle ring seat, the nozzle ring and the turbine rotor assembly, and then assemble the exhaust cylinder, assemble the intake cylinder and the mid-surface saddle pin of the exhaust cylinder, and then firmly install the first bearing support and the second bearing support, and then assemble the half-coupling and the half-coupling locking nut, and then firmly install the push-pull main shaft bracket on the bearing seat and fasten it with bolts, and assemble the push-pull main shaft screw, pass it through the push-pull main shaft bracket, and the fixing plate is installed on the half-coupling locking nut, fastened with bolts, and an adjustment nut is installed on the threaded end.

[0008] Among them, in the step 2, the A / B value is measured, the magnetic micrometer is fixed to the mounting surface of the exhaust cylinder sealing end cover plate, the meter head is placed on the non-connected end face of the main shaft, and the push-pull main shaft screw is in contact with the push-pull main shaft bracket through a nut. The main shaft is pushed and pulled by rotating the nut to obtain the maximum push-pull value, respectively. The micrometer is used to read the value, and the A value and B value of the dynamic and static clearance value of the flow-through part can be measured. The A value is the maximum value when the main shaft is pulled toward the connected end, and the B value is the minimum value when the main shaft is pushed toward the non-connected end.

[0009] Among them, in the step three, remove the magnetic micrometer, the push-pull spindle bracket, the push-pull spindle screw, the half-coupling and the half-coupling locking nut, and then assemble the thrust plate, the thrust plate key, the thrust plate positioning ring, the thrust plate locking ring and the thrust plate outer locking nut, first install the thrust plate key into the corresponding keyway on the spindle, and then install the thrust plate, make the thrust plate contact with the first bearing support end face, assemble the thrust plate positioning ring in the corresponding ring groove position on the spindle, and install the thrust plate locking ring The thrust plate locking ring is matched with the thrust plate locating ring through the end face to determine the axial position, and then the countersunk hole on the thrust plate locking ring is aligned with the screw hole on the thrust plate, and the spring washer and the hexagon socket bolt are installed. The thrust plate is pulled toward the thrust plate locking ring by tightening the bolts, and the thrust plate and the thrust plate outer locking nut are matched and locked with the thrust plate locking ring. The auxiliary thrust bearing and the connecting end cover plate are assembled on the bearing seat, and then the half-coupling, the half-coupling locking nut, the push-pull spindle bracket and the push-pull spindle screw are assembled.

[0010] Among them, in the step four, the magnetic micrometer is fixed to the mounting surface of the exhaust cylinder sealing end cover plate, the gauge head is placed on the non-connected end face of the main shaft, and the push-pull main shaft screw is in contact with the push-pull main shaft bracket through a nut. The main shaft is pushed toward the non-connected end by rotating the nut, and the measured dimension is recorded as C. The dynamic and static clearances between the connecting end and the non-connected end are calculated, and the dynamic and static clearances of the connecting end are L1=AC, and the dynamic and static clearances of the non-connected end are L2=CB. By rotating the nut, cooperating with the push-pull main shaft screw and the push-pull main shaft bracket, the main shaft is pushed and pulled back and forth, and the thrust clearance value, that is, the difference between the maximum value and the minimum value, can be measured.

[0011] The beneficial effects of the main shaft push-pull tooling and thrust plate assembly method of the present invention are: ensuring the dynamic and static clearance values ​​of the expander, avoiding dynamic and static clearance deviations caused by processing errors, ensuring aerodynamic efficiency and stable operation to the greatest extent, and also solving the problem of difficult assembly of key components of the expander. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural cross-sectional view of the expander of the present invention.

[0014] Figure 2 It is a structural sectional view of the unit assembly of the present invention.

[0015] Figure 3 It is a schematic diagram of the measurement structure of the dynamic and static clearance values ​​of the present invention.

[0016] Figure 4 The invention discloses a flowchart of the steps of assembling a main shaft push-pull tooling and a thrust plate.

[0017] 1-bearing seat, 2-intake cylinder, 3-nozzle ring seat, 4-nozzle ring, 5-turbine rotor assembly, 6-exhaust cylinder, 7-first bearing support, 8-second bearing support, 9-half coupling, 10-half coupling locking nut, 11-push-pull spindle bracket, 12-push-pull spindle screw, 13-thrust plate, 14-thrust plate key, 15 thrust plate locating ring, 16-thrust plate locking ring, 17-thrust plate outer locking nut. DETAILED DESCRIPTION

[0018] See also Figures 1 to 4 The present invention provides a method for assembling a spindle push-pull tool and a thrust plate, comprising the following steps: Step 1: Install the expander in order, including the bearing seat 1, the air inlet cylinder 2, the nozzle ring seat 3, the nozzle ring 4, the turbine rotor assembly 5, the exhaust cylinder 6, the first bearing support 7, the second bearing support 8, the half coupling 9, the half coupling locking nut 10, the push-pull main shaft bracket 11, the push-pull main shaft screw 12 and the fixing plate; Step 2: Use a magnetic micrometer to measure the A and B values ​​of the dynamic and static clearances; Step 3: Install the thrust plate 13, the thrust plate key 14, the thrust plate positioning ring 15, the thrust plate locking ring 16 and the thrust plate outer locking nut 17 on the expander in sequence; Step 4: Place the magnetic micrometer on the non-connected end face of the spindle, push the spindle toward the non-connected end by rotating the nut, record the measured dimension as C, calculate the dynamic and static clearances between the connected end and the non-connected end, push and pull the spindle back and forth, and measure the thrust clearance value, which is the difference between the maximum and minimum values.

[0019] Furthermore, in the step one, the bearing seat 1 and the intake cylinder 2 of the expander are first assembled, and then the nozzle ring seat 3, the nozzle ring 4 and the turbine rotor assembly 5 are assembled, and then the exhaust cylinder 6 is assembled, and the split-surface saddle pins in the intake cylinder 2 and the exhaust cylinder 6 are assembled, and then the first bearing support 7 and the second bearing support 8 are firmly installed, and then the half-coupling 9 and the half-coupling locking nut 10 are assembled, and then the push-pull main shaft bracket 11 is firmly installed on the bearing seat 1 and fastened with bolts, and the push-pull main shaft screw 12 is assembled, passed through the push-pull main shaft bracket 11, and the fixing plate is installed on the half-coupling 9 locking nut, fastened with bolts, and an adjustment nut is installed on the threaded end. The expander assembled in the step one is as follows Figure 2 shown.

[0020] Furthermore, in the step 2, the A / B value is measured, and the magnetic micrometer is fixed to the mounting surface of the sealing end cover of the exhaust cylinder 6, with the meter head placed on the non-connected end face of the main shaft. The push-pull main shaft screw 12 is in contact with the push-pull main shaft bracket 11 through a nut, and the main shaft is pushed and pulled by rotating the nut to obtain the maximum push-pull values, respectively. The micrometer is used to read the values, and the A and B values ​​of the dynamic and static clearance values ​​of the flow-through part can be measured. The A value is the maximum value when the main shaft is pulled toward the connected end, and the B value is the minimum value when the main shaft is pushed toward the non-connected end.

[0021] Furthermore, in the step three, remove the magnetic micrometer, the push-pull spindle bracket 11, the push-pull spindle screw 12, the half-coupling 9 and the half-coupling locking nut 10, and then assemble the thrust plate 13, the thrust plate key 14, the thrust plate positioning ring 15, the thrust plate locking ring 16 and the thrust plate outer locking nut 17, first install the thrust plate key 14 into the corresponding keyway on the spindle, and then install the thrust plate 13, make the thrust plate 13 contact the end face of the first bearing support 7, assemble the thrust plate positioning ring 15 to the corresponding ring groove position on the spindle, install the thrust plate locking ring 16, and The thrust plate locking ring 16 is matched with the thrust plate locating ring 15 through the end face to determine the axial position, and then the countersunk hole on the thrust plate locking ring 16 is aligned with the screw hole on the thrust plate 13, and the spring washer and the hexagon socket bolt are installed. The thrust plate 13 is pulled toward the thrust plate locking ring 16 by tightening the bolts. The thrust plate 13 and the thrust plate outer locking nut 17 are locked with the thrust plate locking ring 16. The auxiliary thrust bearing and the connecting end cover plate are assembled on the bearing seat 1, and then the half coupling 9, the half coupling locking nut 10, the push-pull spindle bracket 11 and the push-pull spindle screw 12 are assembled. The assembly of step three is as follows Figure 1 shown.

[0022] Further, in the step 4, the magnetic micrometer is fixed to the mounting surface of the sealing end cover of the exhaust cylinder 6, the gauge head is placed on the non-coupling end face of the spindle, and the push-pull spindle screw 12 is in contact with the push-pull spindle bracket 11 through a nut, and the spindle is pushed toward the non-coupling end by rotating the nut, and the measured dimension is recorded as C. The dynamic and static clearance between the coupling end and the non-coupling end is calculated, and the dynamic and static clearance of the coupling end is L1=AC, and the dynamic and static clearance of the non-coupling end is L2=CB. By rotating the nut, coordinating the push-pull spindle screw 12 with the push-pull spindle bracket 11, the spindle is pushed and pulled back and forth, and the thrust clearance value, that is, the difference between the maximum value and the minimum value, can be measured. The measured values ​​A / B / C in the step 4 are as follows: Figure 3 shown.

[0023] In this embodiment, the dynamic and static clearance values ​​of the expander are ensured, the dynamic and static clearance deviations caused by processing errors are avoided, the aerodynamic efficiency and stable operation are guaranteed to the greatest extent, and the problem of difficult assembly of key components of the expander is also solved.

[0024] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for assembling a main shaft push-pull tool and a thrust plate, characterized in that: The steps include: Step 1: Install the expander in order, including the bearing seat, intake cylinder, nozzle ring seat, nozzle ring, turbine rotor assembly, exhaust cylinder, first bearing support, second bearing support, half coupling, half coupling locking nut, push-pull spindle bracket, push-pull spindle screw and fixing plate; Step 2: Use a magnetic micrometer to measure the A and B values ​​of the dynamic and static clearances; Step 3: Install the thrust plate, thrust plate key, thrust plate locating ring, thrust plate locking ring and thrust plate outer locking nut on the expander in sequence; Step 4: Place the magnetic micrometer on the non-connected end face of the spindle, push the spindle toward the non-connected end by rotating the nut, record the measured dimension as C, calculate the dynamic and static clearances between the connected end and the non-connected end, push and pull the spindle back and forth, and measure the thrust clearance value, which is the difference between the maximum and minimum values.

2. A method for assembling a main shaft push-pull fixture and a thrust plate as claimed in claim 1, characterized in that: In the step one, first assemble the bearing seat and the intake cylinder of the expander, and then assemble the nozzle ring seat, the nozzle ring and the turbine rotor assembly, and then assemble the exhaust cylinder, assemble the intake cylinder and the mid-surface saddle pin of the exhaust cylinder, and then firmly install the first bearing support and the second bearing support, and then assemble the half-coupling and the half-coupling locking nut, and then firmly install the push-pull main shaft bracket on the bearing seat and fasten it with bolts, and assemble the push-pull main shaft screw, pass it through the push-pull main shaft bracket, and install the fixing plate on the half-coupling locking nut, fasten it with bolts, and install an adjustment nut on the threaded end.

3. A method for assembling a main shaft push-pull fixture and a thrust plate as claimed in claim 2, characterized in that: In the step 2, the A / B value is measured, and the magnetic micrometer is fixed to the mounting surface of the exhaust cylinder sealing end cover plate, and the meter head is placed on the non-connected end face of the main shaft. The push-pull main shaft screw is in contact with the push-pull main shaft bracket through a nut, and the main shaft is pushed and pulled by rotating the nut to obtain the maximum push-pull value, respectively. The micrometer is used to read the value, and the A value and B value of the dynamic and static clearance value of the flow-through part can be measured. The A value is the maximum value when the main shaft is pulled toward the connected end, and the B value is the minimum value when the main shaft is pushed toward the non-connected end.

4. A method for assembling a main shaft push-pull fixture and a thrust plate as claimed in claim 3, characterized in that: In the step three, remove the magnetic micrometer, the push-pull spindle bracket, the push-pull spindle screw, the half-coupling and the half-coupling locking nut, and then assemble the thrust plate, the thrust plate key, the thrust plate positioning ring, the thrust plate locking ring and the thrust plate outer locking nut, first install the thrust plate key into the corresponding keyway on the spindle, and then install the thrust plate, make the thrust plate contact with the first bearing support end face, assemble the thrust plate positioning ring in the corresponding ring groove position on the spindle, install the thrust plate locking ring, and The thrust plate locking ring is matched with the thrust plate locating ring through the end face to determine the axial position, and then the countersunk hole on the thrust plate locking ring is aligned with the screw hole on the thrust plate, and the spring washer and the hexagon socket bolt are installed. The thrust plate is pulled toward the thrust plate locking ring by tightening the bolts, and the thrust plate and the thrust plate outer locking nut are matched and locked with the thrust plate locking ring. The auxiliary thrust bearing and the connecting end cover plate are assembled on the bearing seat, and then the half-coupling, the half-coupling locking nut, the push-pull main shaft bracket and the push-pull main shaft screw are assembled.

5. A method for assembling a main shaft push-pull fixture and a thrust plate as claimed in claim 4, characterized in that: In the step four, the magnetic micrometer is fixed to the mounting surface of the exhaust cylinder sealing end cover plate, the gauge head is placed on the non-connected end face of the main shaft, and the push-pull main shaft screw is in contact with the push-pull main shaft bracket through a nut. The main shaft is pushed toward the non-connected end by rotating the nut, and the measured dimension is recorded as C. The dynamic and static clearances between the connecting end and the non-connected end are calculated. The dynamic and static clearances of the connecting end are L1=AC, and the dynamic and static clearances of the non-connected end are L2=CB. By rotating the nut, cooperating with the push-pull main shaft screw and the push-pull main shaft bracket, the main shaft is pushed and pulled back and forth, and the thrust clearance value, that is, the difference between the maximum value and the minimum value, can be measured.

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