Insulation assembly method for upper guide sleeve of hydro-generator

Abstract

The present application relates to the field of assembly and manufacturing technology, and specifically to an insulation assembly method for an upper guide sleeve of a hydro-turbine generator; the method comprises the following steps: applying insulating glue to the outer side of the sleeve; wrapping an inner layer of insulating material around the outer side of the sleeve so that the upper layer of insulating material fits the sleeve; applying insulating glue between multiple layers of insulating material in the inner layer of insulating material so that the multiple layers of insulating material are wrapped and fixed, and the insulating glue applied on each layer of insulating material is staggered with each other in the radial direction of the sleeve; pre-installing a copper strip on the sleeve and wrapping the copper strip around the outer side of the inner layer of insulating material; applying insulating glue to the outer side of the copper strip along the axial direction of the copper strip wrapping; wrapping an outer layer of insulating material around the outer side of the copper strip to complete the assembly; the advantage of the present invention is that it improves the quality of the insulation assembly of the upper guide sleeve of the hydro-turbine generator, greatly improves the production efficiency of the upper guide sleeve and the success rate of the subsequent shrink-fit of the upper guide rotor and the upper guide sleeve.

Description

Technical Field

[0001] The present application relates to the field of assembly and manufacturing technology, and in particular to an insulation assembly method for an upper guide sleeve of a hydro-generator. Background Art

[0002] With the large-scale grid connection of nuclear power, solar energy and wind energy projects in my country, the construction speed of pumped storage power stations has developed rapidly; the guide rotor assembly on the pumped storage unit is used to control the shaft system swing, and its internal shaft insulation is used to isolate the shaft system shaft current path; a copper strip is set inside the insulation to realize online monitoring of the shaft insulation performance; the pumped storage unit has a high speed and frequent forward and reverse rotation. In order to prevent relative sliding between the upper guide rotor and the sleeve during unit operation, an interference fit is adopted between the two. The relative tightness is the largest and the assembly difficulty is the highest among all hydropower projects; the upper guide rotor and the sleeve adopt a shrink fit assembly process, but the insulation grounding quality problems often occur during the shrink fit process of the upper guide rotor and the sleeve, which seriously restricts the production quality and delivery of the upper guide rotor of the pumped storage unit.

[0003] There is a Chinese patent with application number 202410354372.8 and application date of 2024.03.27. The patent name is "A device for controlling the quality of insulation wrapping of the upper guide sleeve of a pumped storage unit". Its technical solution is: a device for controlling the quality of insulation wrapping of the upper guide sleeve of a pumped storage unit, including a support beam, on which are connected a plurality of radial limit units and a plurality of horizontal limit units, the radial limit units contact the inner wall of the upper guide sleeve, and the horizontal limit units overlap the upper plane of the upper guide sleeve. The support beam is also equipped with an insulation control unit for wrapping the insulation material of the upper guide sleeve; the present invention provides a device for controlling the quality of insulation wrapping of the upper guide sleeve of a pumped storage unit, which effectively solves the problem of upper and lower deviation in the insulation wrapping process and improves the efficiency of insulation wrapping of the upper guide sleeve.

[0004] The above patent effectively solves the problem of upward and downward deviation during the insulation material wrapping process by using a mechanical device, but the insulation material wrapping process still has quality problems of the insulation material such as excessive insulation thickness. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present application provides an assembly method for an upper guide sleeve of a pumped storage unit that can improve the insulation assembly quality.

[0006] In order to achieve the above technical effects, the technical solutions of this application are as follows:

[0007] A method for insulating and assembling an upper guide sleeve of a hydro-generator comprises the following steps:

[0008] Step 1: Apply insulating glue on the outer side of the sleeve along the axial direction of the sleeve, and make the insulating glue distributed discontinuously on the outer side of the sleeve;

[0009] Step 2: Wrap the inner insulating material around the outside of the sleeve and make the inner insulating material fit the sleeve, and fix the sleeve and the inner insulating material with the insulating glue on the outside of the sleeve;

[0010] Step 3: Between the multiple layers of insulation material included in the inner insulation material, insulating glue is similarly applied to the outer sides of the multiple layers of insulation material along the width direction of the insulation material. The insulating glue is intermittently distributed on the insulation material so that the multiple layers of insulation material surround and fix each other, and the insulating glue applied on the upper and lower layers of insulation material are staggered along the radial direction of the sleeve;

[0011] Step 4: Pre-install the copper tape on the sleeve to inspect the copper tape. After passing the inspection, wrap the copper tape around the outside of the inner insulating material and fix it to the inner insulating material through the insulating glue applied on the outside of the inner insulating material.

[0012] Step 5: Apply insulating glue on the outside of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outside of the copper tape;

[0013] Step 6: Wrap the outer insulating material around the outside of the copper tape and fit the outer insulating material and the copper tape together. Use the insulating glue on the outside of the copper tape to fix the copper tape and the outer insulating material to complete the assembly.

[0014] Furthermore, the multiple layers of insulating material contained in the inner insulating material in step three are a first layer of insulating material, a second layer of insulating material and a third layer of insulating material; the first layer of insulating material is wrapped around the outside of the sleeve and fits with the sleeve; the second layer of insulating material is wrapped around the outside of the first layer of insulating material and fits with the first layer of insulating material; the third layer of insulating material is wrapped around the outside of the second layer of insulating material and fits with the second layer of insulating material.

[0015] Furthermore, along the radial direction of the sleeve, each section of insulating adhesive on the outer side of the second layer of insulating material is located at the interval between each layer of insulating adhesive on the outer side of the first layer of insulating adhesive material.

[0016] Furthermore, in step 4, the specific method of pre-installing the copper tape on the sleeve is: completely wrapping the copper tape around the outside of the inner insulating material that is not coated with insulating glue; the specific method of inspecting the copper tape is: in the axial direction of the sleeve, the upper plane of the copper tape is lower than the upper plane of the inner insulating material, the lower plane of the copper tape is higher than the lower plane of the inner insulating material, and after the copper tape wraps around the inner insulating material, a gap is left between the head and the end of the copper tape; the gap is 6mm~10mm.

[0017] Furthermore, in step 4, the copper tape is wrapped around the outer side of the inner insulating material, and the copper tape is fixed to the inner insulating material by the insulating glue applied to the outer side of the inner insulating material. The specific steps are as follows:

[0018] Step a: Loosen the end of the pre-installed copper tape, unfold half of the copper tape to expose the outside of the inner insulating material, and keep the other half of the copper tape wrapped around the outside of the inner insulating material;

[0019] Step b: applying insulating glue to the outer side of the exposed inner insulating material along the axial direction of the sleeve, and distributing the insulating glue discontinuously on the outer side of the inner insulating material;

[0020] Step c: After the insulating adhesive is applied, the unrolled copper tape is pushed along the circumference of the outer side of the exposed inner insulating material, so that the unrolled copper tape is wrapped around the outer side of the inner insulating material, and the insulating adhesive is used to secure the copper tape to the inner insulating material.

[0021] Step d: Loosen the first end of the pre-installed copper tape and unfold the other half of the copper tape to expose the outer side of the other half of the inner layer of insulation material;

[0022] Step e: Repeat steps b to c to complete the wrapping and fixing operation of the copper tape on the sleeve.

[0023] Furthermore, between the multiple layers of insulating materials included in the outer insulating material in step six, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials, and each section of insulating glue is distributed intermittently on the insulating material, so that the multiple layers of insulating materials are wrapped and fixed to each other, and the insulating glue applied between the upper and lower layers of insulating materials are staggered with each other along the radial direction of the sleeve.

[0024] Furthermore, the multiple layers of insulating material included in the outer layer of insulating material are a fourth layer of insulating material, a fifth layer of insulating material and a sixth layer of insulating material; the fourth layer of insulating material is wrapped around the outside of the copper tape and is in contact with the copper tape; the fifth layer of insulating material is wrapped around the outside of the fourth layer of insulating material and is in contact with the fourth layer of insulating material; the sixth layer of insulating material is wrapped around the outside of the fifth layer of insulating material and is in contact with the fifth layer of insulating material.

[0025] Furthermore, in the radial direction of the sleeve, each section of insulating glue on the outer side of the fifth layer of insulating material is located at the interval between each layer of insulating glue on the outer side of the fourth layer of insulating material.

[0026] Furthermore, the width of the insulating glue applied does not exceed 30 mm, and the interval between each section of insulating glue is 200 mm to 300 mm.

[0027] Furthermore, the insulating glue needs to be diluted with a diluent before use, and the dilution ratio of the insulating glue to the diluent is 1:0.5.

[0028] According to the above technical solution, the beneficial effects of this application are:

[0029] 1. The present invention effectively improves the quality of the insulation assembly of the upper guide sleeve of the hydro-turbine generator by changing the coating method of the insulating glue and optimizing the copper tape wrapping process, avoiding a large amount of rework due to insulation grounding quality problems, greatly improving the production efficiency of the upper guide sleeve and the success rate of the subsequent shrinkage of the upper guide rotor and the upper guide sleeve.

[0030] 2. The present invention reduces the axial pulling effect on the insulation during the shrinkage of the sliding rotor by applying the insulating glue along the axial direction of the sleeve, the width direction of the insulating material, and the axial direction of the copper tape wrapping, compared with the prior art method of applying the insulating glue in a circumferential direction.

[0031] 3. The present invention staggers the positions of applying the insulating glue between the inner insulating material and the outer insulating material, thereby preventing the insulating material from being too thick, thereby preventing the insulating material from being damaged when the upper guide rotor is cooled and clamped.

[0032] 4. The width of the insulating glue applied in the present invention does not exceed 30 mm, and the spacing between each section of insulating glue is 200 mm to 300 mm, so that the insulating glue on the upper and lower layers of insulating materials is staggered along the radial direction of the sleeve, avoiding overlapping of the insulating glue along the radial direction of the sleeve, which leads to thickening of the insulating material.

[0033] 5. The copper tape wrapping method adopted in the present invention solves the problems of misalignment of the beginning and end of the gap and uneven gap during the copper tape wrapping process.

[0034] 6. In the present invention, the dilution ratio of the insulating adhesive is set to 1:0.5, which avoids excessive or insufficient diluent, which may cause the insulating adhesive to not solidify or the insulating adhesive to be applied too thickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the application of each layer of insulation glue and the intervals between the insulation glue.

[0036] Figure 2 It is a schematic diagram of the structure of the sleeve, inner insulation material and copper tape.

[0037] Figure 3 This is a schematic diagram of the copper tape wrapping.

[0038] Figure 4 It is an overall schematic diagram of the upper guide sleeve. DETAILED DESCRIPTION

[0039] The purpose, technical solutions and advantages of the embodiments of the present application are clearer. The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0040] Example 1

[0041] A method for insulating and assembling an upper guide sleeve of a hydro-generator comprises the following steps:

[0042] like Figure 1 As shown, step 1: along the axial direction of the sleeve, apply insulating glue on the outer side of the sleeve, and make the insulating glue discontinuously distributed on the outer side of the sleeve; the insulating glue can be evenly spaced and discontinuously distributed on the outer side of the sleeve;

[0043] Step 2: Wrap the inner insulating material around the outside of the sleeve and make the inner insulating material fit the sleeve, and fix the sleeve and the inner insulating material with the insulating glue on the outside of the sleeve;

[0044] Step 3: If Figure 2 As shown, between the multiple layers of insulating materials included in the inner insulating material, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials. The insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials surround and fix each other, and the insulating glue applied on the upper and lower layers of insulating materials are staggered in the radial direction of the sleeve.

[0045] Step 4: If Figure 3 As shown, the copper tape is pre-installed on the sleeve, and the copper tape is inspected. After passing the inspection, the copper tape is wrapped around the outside of the inner insulating material and fixed to the inner insulating material by the insulating glue applied on the outside of the inner insulating material.

[0046] Step 5: Apply insulating glue on the outside of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outside of the copper tape;

[0047] Step 6: Wrap the outer insulating material around the outside of the copper tape, and make the outer insulating material fit the copper tape. Use the insulating glue on the outside of the copper tape to fix the copper tape and complete the assembly. The inner and outer insulating materials of the sleeve should be heat-fitted within two hours after wrapping to avoid wrinkles in the insulating material after wrapping for too long, which will cause difficulties in heat-fitting.

[0048] The multiple layers of insulating material included in the inner insulating material in step three are a first layer of insulating material, a second layer of insulating material and a third layer of insulating material; the first layer of insulating material is wrapped around the outside of the sleeve and fits with the sleeve; the second layer of insulating material is wrapped around the outside of the first layer of insulating material and fits with the first layer of insulating material; the third layer of insulating material is wrapped around the outside of the second layer of insulating material and fits with the second layer of insulating material; the first layer of insulating material, the second layer of insulating material and the third layer of insulating material are arranged from bottom to top in order, the first layer of insulating material is the insulating material of the bottommost layer of the inner insulating material, and the third layer of insulating material is the insulating material of the topmost layer of the inner insulating material.

[0049] In the radial direction of the sleeve, each section of insulating adhesive on the outer side of the second insulating material is located at the interval between each layer of insulating adhesive on the outer side of the first insulating adhesive;

[0050] In step six, between the multiple layers of insulating materials included in the outer insulating material, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating material. Each section of insulating glue is discontinuously distributed on the insulating material, so that the multiple layers of insulating materials are wrapped and fixed to each other, and the insulating glue applied between the upper and lower layers of insulating materials are staggered along the radial direction of the sleeve; the insulating glue in the inner and outer insulating materials are staggered along the radial direction of the sleeve to avoid overlapping of the insulating glue, which will increase the local thickness after overlapping. Because the clamping force of the upper guide rotor is very large, such a huge clamping force can easily cause local high points to damage the insulating material.

[0051] The multiple layers of insulation material included in the outer insulation material are a fourth layer of insulation material, a fifth layer of insulation material and a sixth layer of insulation material; the fourth layer of insulation material is wrapped around the outside of the copper tape and is in contact with the copper tape; the fifth layer of insulation material is wrapped around the outside of the fourth layer of insulation material and is in contact with the fourth layer of insulation material; the sixth layer of insulation material is wrapped around the outside of the fifth layer of insulation material and is in contact with the fifth layer of insulation material. Along the radial direction of the sleeve, each section of insulation glue on the outside of the fifth layer of insulation material is located at the interval between each layer of insulation glue on the outside of the fourth layer of insulation material; the fourth layer of insulation material, the fifth layer of insulation material and the sixth layer of insulation material are arranged from bottom to top in sequence, the fourth layer of insulation material is the insulation material of the bottommost layer of the outer insulation material, and the sixth layer of insulation material is the insulation material of the topmost layer of the outer insulation material; such as Figure 4 As shown, Figure 4The insulating material includes an outer insulating material and an inner insulating material; the inner insulating material and the outer insulating material can also be two layers, four layers or five layers. The most suitable number of layers of the inner insulating material and the outer insulating material are two to three layers. If the number of layers of the inner insulating material and the outer insulating material are both one layer, the insulating material is easily damaged during the shrink-fit process. If the number of layers of the inner insulating material and the outer insulating material are both more than three layers, during the shrink-fit process, it is easy to cause relative movement between the sleeve and the upper guide rotor in the axial direction.

[0052] The width of all insulating adhesive applied in the present invention does not exceed 30 mm, and the spacing between each section of insulating adhesive is 200 mm to 300 mm. The insulating adhesive needs to be diluted with a diluent before use, with the dilution ratio of insulating adhesive to diluent being 1:0.5. The insulating adhesive used is 3M EC847, and the diluent can be acetone or ethyl acetate.

[0053] The inner layer insulation material and the outer layer insulation material in the present invention are both made of polyimide film which can withstand a high temperature of 400 degrees Celsius and has very good toughness and insulation properties.

[0054] Example 2

[0055] A method for insulating and assembling an upper guide sleeve of a hydro-generator comprises the following steps:

[0056] like Figure 1 As shown, step 1: along the axial direction of the sleeve, apply insulating glue on the outer side of the sleeve, and make the insulating glue discontinuously distributed on the outer side of the sleeve; the insulating glue can be evenly spaced and discontinuously distributed on the outer side of the sleeve;

[0057] Step 2: Wrap the inner insulating material around the outside of the sleeve and make the inner insulating material fit the sleeve, and fix the sleeve and the inner insulating material with the insulating glue on the outside of the sleeve;

[0058] Step 3: If Figure 2 As shown, between the multiple layers of insulating materials included in the inner insulating material, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials. The insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials surround and fix each other, and the insulating glue applied on the upper and lower layers of insulating materials are staggered in the radial direction of the sleeve.

[0059] Step 4: If Figure 3 As shown, the copper tape is pre-installed on the sleeve, and the copper tape is inspected. After passing the inspection, the copper tape is wrapped around the outside of the inner insulating material and fixed to the inner insulating material by the insulating glue applied on the outside of the inner insulating material.

[0060] Step 5: Apply insulating glue on the outside of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outside of the copper tape;

[0061] Step 6: Wrap the outer insulating material around the outside of the copper tape, and make the outer insulating material fit the copper tape. Use the insulating glue on the outside of the copper tape to fix the copper tape and complete the assembly. The inner and outer insulating materials of the sleeve should be heat-fitted within two hours after wrapping to avoid wrinkles in the insulating material after wrapping for too long, which will cause difficulties in heat-fitting.

[0062] The multiple layers of insulating material included in the inner insulating material in step three are a first layer of insulating material, a second layer of insulating material and a third layer of insulating material; the first layer of insulating material is wrapped around the outside of the sleeve and fits with the sleeve; the second layer of insulating material is wrapped around the outside of the first layer of insulating material and fits with the first layer of insulating material; the third layer of insulating material is wrapped around the outside of the second layer of insulating material and fits with the second layer of insulating material; the first layer of insulating material, the second layer of insulating material and the third layer of insulating material are arranged from bottom to top, the first layer of insulating material is the insulating material of the bottommost layer of the inner insulating material, and the third layer of insulating material is the insulating material of the topmost layer of the inner insulating material.

[0063] In the radial direction of the sleeve, each section of insulating adhesive on the outer side of the second insulating material is located at the interval between each layer of insulating adhesive on the outer side of the first insulating adhesive;

[0064] like Figure 3 As shown, the specific method of pre-installing the copper tape on the sleeve in step 4 is: completely wrap the copper tape around the outside of the inner insulating material that is not coated with insulating glue; the specific method of inspecting the copper tape is: in the axial direction of the sleeve, the upper plane of the copper tape is lower than the upper plane of the inner insulating material, the lower plane of the copper tape is higher than the lower plane of the inner insulating material, and after the copper tape wraps around the inner insulating material, a gap is left between the head and the end of the copper tape; the gap is 6mm~10mm; the upper plane of the copper tape is 10mm~15mm lower than the upper plane of the upper guide sleeve, and the lower plane of the copper tape is about 15mm higher than the lower plane of the inner insulating material.

[0065] In step 4, the copper tape is wrapped around the outside of the inner insulating material and fixed to the inner insulating material using the insulating glue applied to the outer side of the inner insulating material. The specific steps are as follows:

[0066] Step a: Loosen the end of the pre-installed copper tape, unfold half of the copper tape to expose the outside of the inner insulating material, and wrap the other half of the copper tape around the outside of the inner insulating material, ensuring that the other half of the copper tape is pressed tightly against the sleeve;

[0067] Step b: applying insulating glue to the outer side of the exposed inner insulating material along the axial direction of the sleeve, and distributing the insulating glue discontinuously on the outer side of the inner insulating material;

[0068] Step c: After the insulating adhesive is applied, the unrolled copper tape is pushed along the circumference of the outer side of the exposed inner insulating material, so that the unrolled copper tape is wrapped around the outer side of the inner insulating material, and the insulating adhesive is used to secure the copper tape to the inner insulating material.

[0069] Step d: Loosen the first end of the pre-installed copper tape and unfold the other half of the copper tape to expose the outer side of the other half of the inner layer of insulation material;

[0070] Step e: Repeat steps b to c to complete the wrapping and fixing of the copper tape on the sleeve; install the copper tape to detect whether the inner and outer insulating materials are grounded; Figure 3 When bonding the copper tape, the pushing direction should be to push the unfolded copper tape along the outer circumferential direction of the exposed inner insulating material, and wrap it around the outer side of the inner insulating material.

[0071] In step six, between the multiple layers of insulating materials included in the outer insulating material, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating material. Each section of insulating glue is discontinuously distributed on the insulating material, so that the multiple layers of insulating materials are wrapped and fixed to each other, and the insulating glue applied between the upper and lower layers of insulating materials are staggered along the radial direction of the sleeve; the insulating glue in the inner and outer insulating materials are staggered along the radial direction of the sleeve to avoid overlapping of the insulating glue, which will increase the local thickness after overlapping. Because the clamping force of the upper guide rotor is very large, such a huge clamping force can easily cause local high points to damage the insulating material.

[0072] The multiple layers of insulating material included in the outer insulating material are a fourth layer of insulating material, a fifth layer of insulating material and a sixth layer of insulating material; the fourth layer of insulating material is wrapped around the outside of the copper tape and is in contact with the copper tape; the fifth layer of insulating material is wrapped around the outside of the fourth layer of insulating material and is in contact with the fourth layer of insulating material; the sixth layer of insulating material is wrapped around the outside of the fifth layer of insulating material and is in contact with the fifth layer of insulating material in the radial direction of the sleeve, and each section of insulating glue on the outside of the fifth layer of insulating material is located at the interval between each layer of insulating glue on the outside of the fourth layer of insulating material; the fourth layer of insulating material, the fifth layer of insulating material and the sixth layer of insulating material are arranged from bottom to top in sequence, the fourth layer of insulating material is the insulating material of the bottommost layer of the outer insulating material, and the sixth layer of insulating material is the insulating material of the topmost layer of the outer insulating material; such as Figure 4 As shown, Figure 4The insulating material includes an outer insulating material and an inner insulating material; the inner insulating material and the outer insulating material can also be two layers, four layers or five layers. The most suitable number of layers of the inner insulating material and the outer insulating material are two to three layers. If the number of layers of the inner insulating material and the outer insulating material are both one layer, the insulating material is easily damaged during the shrink-fit process. If the number of layers of the inner insulating material and the outer insulating material are both more than three layers, during the shrink-fit process, it is easy to cause relative movement between the sleeve and the upper guide rotor in the axial direction.

[0073] The width of all insulating adhesive applied in the present invention does not exceed 30 mm, and the spacing between each section of insulating adhesive is 200 mm to 300 mm. The insulating adhesive needs to be diluted with a diluent before use, with the dilution ratio of insulating adhesive to diluent being 1:0.5. The insulating adhesive used is 3M EC847, and the diluent can be acetone or ethyl acetate.

[0074] The inner layer insulation material and the outer layer insulation material in the present invention are both made of polyimide film which can withstand a high temperature of 400 degrees Celsius and has very good toughness and insulation properties.

[0075] The above description is a detailed description of the preferred feasible embodiment of the present application, but the embodiment is not intended to limit the scope of the patent application of the present application. Any equivalent changes or modifications completed under the technical spirit suggested by the present application should fall within the scope of the patent covered by the present application.

Claims

1. A method for assembling the insulation of the upper guide sleeve of a hydro-generator, characterized in that: The steps include: Step 1: Apply insulating glue on the outer side of the sleeve along the axial direction of the sleeve, and make the insulating glue distributed discontinuously on the outer side of the sleeve; Step 2: Wrap the inner insulating material around the outside of the sleeve and make the inner insulating material fit the sleeve, and fix the sleeve and the inner insulating material with the insulating glue on the outside of the sleeve; Step 3: Between the multiple layers of insulation material included in the inner insulation material, insulating glue is similarly applied to the outer sides of the multiple layers of insulation material along the width direction of the insulation material. The insulating glue is intermittently distributed on the insulation material so that the multiple layers of insulation material surround and fix each other, and the insulating glue applied on the upper and lower layers of insulation material are staggered along the radial direction of the sleeve; Step 4: Pre-install the copper tape on the sleeve to inspect the copper tape. After passing the inspection, wrap the copper tape around the outside of the inner insulating material and fix it to the inner insulating material through the insulating glue applied on the outside of the inner insulating material. Step 5: Apply insulating glue on the outside of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outside of the copper tape; Step 6: Wrap the outer insulating material around the outside of the copper tape and fit the outer insulating material and the copper tape together. Use the insulating glue on the outside of the copper tape to fix the copper tape and the outer insulating material to complete the assembly.

2. The insulation assembly method of the upper guide sleeve of the hydro-generator according to claim 1, characterized in that: The multiple layers of insulating material contained in the inner insulating material in step three are a first layer of insulating material, a second layer of insulating material and a third layer of insulating material; the first layer of insulating material is wrapped around the outside of the sleeve and fits with the sleeve; the second layer of insulating material is wrapped around the outside of the first layer of insulating material and fits with the first layer of insulating material; the third layer of insulating material is wrapped around the outside of the second layer of insulating material and fits with the second layer of insulating material.

3. The insulation assembly method for the upper guide sleeve of a hydro-generator according to claim 2, characterized in that: In the radial direction of the sleeve, each section of insulating adhesive on the outer side of the second insulating material layer is located at the interval between each layer of insulating adhesive on the outer side of the first insulating adhesive layer.

4. The insulation assembly method of the upper guide sleeve of a hydro-generator according to claim 1, characterized in that: The specific method of pre-installing the copper tape on the sleeve in step 4 is: completely wrapping the copper tape around the outside of the inner insulating material that is not coated with insulating glue; the specific method of inspecting the copper tape is: in the axial direction of the sleeve, the upper plane of the copper tape is lower than the upper plane of the inner insulating material, the lower plane of the copper tape is higher than the lower plane of the inner insulating material, and after the copper tape wraps around the inner insulating material, a gap is left between the head and the end of the copper tape; the gap is 6mm~10mm.

5. The insulation assembly method of the upper guide sleeve of a hydro-generator according to claim 1, characterized in that: In step 4, the copper tape is wrapped around the outside of the inner insulating material and fixed to the inner insulating material using the insulating glue applied to the outer side of the inner insulating material. The specific steps are as follows: Step a: Loosen the end of the pre-installed copper tape, unfold half of the copper tape to expose the outside of the inner insulating material, and keep the other half of the copper tape wrapped around the outside of the inner insulating material; Step b: applying insulating glue to the outer side of the exposed inner insulating material along the axial direction of the sleeve, and distributing the insulating glue discontinuously on the outer side of the inner insulating material; Step c: After the insulating adhesive is applied, the unrolled copper tape is pushed along the circumference of the outer side of the exposed inner insulating material, so that the unrolled copper tape is wrapped around the outer side of the inner insulating material, and the insulating adhesive is used to secure the copper tape to the inner insulating material. Step d: Loosen the first end of the pre-installed copper tape and unfold the other half of the copper tape to expose the outer side of the other half of the inner layer of insulation material; Step e: Repeat steps b to c to complete the wrapping and fixing operation of the copper tape on the sleeve.

6. The insulation assembly method of the upper guide sleeve of a hydro-generator according to claim 1, characterized in that: In the step six, between the multiple layers of insulating materials included in the outer insulating material, insulating glue is applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials. Each section of insulating glue is distributed intermittently on the insulating material, so that the multiple layers of insulating materials are wrapped and fixed to each other, and the insulating glue applied between the upper and lower layers of insulating materials are staggered with each other along the radial direction of the sleeve.

7. The insulation assembly method for the upper guide sleeve of a hydro-generator according to claim 6, characterized in that: The multiple layers of insulating material included in the outer layer of insulating material are a fourth layer of insulating material, a fifth layer of insulating material and a sixth layer of insulating material; the fourth layer of insulating material is wrapped around the outside of the copper tape and is in contact with the copper tape; the fifth layer of insulating material is wrapped around the outside of the fourth layer of insulating material and is in contact with the fourth layer of insulating material; the sixth layer of insulating material is wrapped around the outside of the fifth layer of insulating material and is in contact with the fifth layer of insulating material.

8. The insulation assembly method for the upper guide sleeve of a hydro-generator according to claim 7, characterized in that: In the radial direction of the sleeve, each section of insulating glue on the outer side of the fifth layer of insulating material is located at the interval between each layer of insulating glue on the outer side of the fourth layer of insulating material.

9. The insulation assembly method for the upper guide sleeve of a hydro-generator according to any one of claims 1 to 8, characterized in that: The width of the insulating glue applied shall not exceed 30mm, and the interval between each section of insulating glue shall be 200mm~300mm.

10. The insulation assembly method for the upper guide sleeve of a hydro-generator according to claim 9, characterized in that: The insulating glue needs to be diluted with a thinner before use. The dilution ratio of the insulating glue to the thinner is 1:0.5.

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