Insulation assembling method for upper guide sleeve of hydraulic generator

Abstract

The invention relates to the technical field of assembly manufacturing, in particular to an insulation assembly method for an upper guide sleeve of a hydraulic generator. The method comprises the steps that the outer side of the sleeve is coated with insulating glue; the inner-layer insulating material surrounds the outer side of the sleeve, so that the upper-layer insulating material is attached to the sleeve; insulation paste is brushed between multiple layers of insulation materials in the inner layer insulation material, so that the multiple layers of insulation materials are wrapped and fixed, and the insulation paste brushed on each layer of insulation material is staggered in the radial direction of the sleeve; the copper strip is pre-installed on the sleeve, and the copper strip is wrapped on the outer side of the inner-layer insulating material in a surrounding mode; the outer side of the copper strip is coated with insulating glue in the axial direction of the copper strip enclosure; wrapping the outer side of the copper strip with an outer-layer insulating material to complete assembly; the tool has the advantages that the insulation assembly quality of the upper guide sleeve of the hydraulic generator is improved, the production efficiency of the upper guide sleeve is greatly improved, and the success rate of subsequent shrinkage fit of an upper guide sliding rotor and the upper guide sleeve is greatly increased.

Description

Technical Field

[0001] The present application relates to the technical field of assembly and manufacturing, and in particular to an insulation assembly method for an upper guide sleeve of a hydro-turbine 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 upper guide rotor assembly of the pumped storage unit is used to control the swing of the shaft system, and its internal shaft insulation is used to isolate the shaft current path of the shaft system; 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 positive and reverse rotation. In order to prevent relative sliding between the upper guide rotor and the sleeve during the operation of the unit, an interference fit is adopted between the two, which has the largest relative tightness and the highest assembly difficulty in 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 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 unit contacts the inner wall of the upper guide sleeve, the horizontal limit unit overlaps the upper plane of the upper guide sleeve, and an insulation control unit for wrapping the insulation material of the upper guide sleeve is also installed on the support beam; 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 up and down 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 up and down deviation in 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 which can improve the insulation assembly quality.

[0006] In order to achieve the above technical effects, the technical solution of this application is as follows: An insulation assembly method for an upper guide sleeve of a hydro-turbine generator comprises the following steps: 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 through the insulating glue on the outside of the sleeve; Step 3: Between the multiple layers of insulating materials included in the inner insulating material, insulating glue is also applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials, and the insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials are mutually surrounded and fixed, and the insulating glue applied on the upper and lower layers of insulating materials are staggered with each other in 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 outer side of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outer side of the copper tape; 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 the outer insulating material to complete the assembly.

[0007] Furthermore, the multiple layers of insulating materials 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.

[0008] Furthermore, along the radial direction of the sleeve, each section of insulating glue on the outer side of the second layer of insulating material is located at the interval between each layer of insulating glue on the outer side of the first layer of insulating glue material.

[0009] 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.

[0010] Furthermore, in step 4, the copper tape is wrapped around the outer side of the inner insulating material, and the inner insulating material 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: 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 the other half of the copper tape is still 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 unfolded copper tape is pushed along the circumferential direction of the outer side of the exposed inner insulating material, so that the unfolded 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 adhesive; Step d: loosen the first end of the pre-installed copper tape, unfold the other half of the copper tape, and expose the outer side of the other half of the inner insulating material; Step e: Repeat steps b to c to complete the wrapping and fixing operation of the copper belt on the sleeve.

[0011] 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 discontinuously on the insulating material, so that the multiple layers of insulating materials are surrounded 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.

[0012] 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.

[0013] Furthermore, along 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.

[0014] Furthermore, the width of the insulating glue coating does not exceed 30 mm, and the spacing between each section of the insulating glue is 200 mm to 300 mm.

[0015] 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.

[0016] According to the above technical solution, the beneficial effects of this application are: 1. The present invention effectively improves the quality of 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, and greatly improving the production efficiency of the upper guide sleeve and the success rate of subsequent heat-shrinking of the upper guide sliding rotor and the upper guide sleeve.

[0017] 2. The present invention reduces the axial pulling effect on the insulation during the cold 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 circumferential application of the insulating glue in the prior art.

[0018] 3. The present invention staggers the positions of the insulating glue coating between the inner insulating material and the outer insulating material, thereby preventing the insulating material from being too thick, thereby damaging the insulating material when the upper guide rotor is cooled and clamped.

[0019] 4. The width of the insulating glue applied by 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 insulating materials is staggered along the radial direction of the sleeve to avoid overlapping of the insulating glue along the radial direction of the sleeve, which leads to thickening of the insulating material.

[0020] 5. The copper tape wrapping method adopted by 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.

[0021] 6. In the present invention, the dilution ratio of the insulating glue is set to 1:0.5, which avoids excessive or insufficient diluent, resulting in the insulating glue not being cured or the insulating glue being applied too thickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the application of each layer of insulating glue and the intervals between the insulating glue.

[0023] Figure 2 It is a schematic diagram of the structure of the sleeve, inner insulating material and copper tape.

[0024] Figure 3 This is a schematic diagram of the copper tape wrapping.

[0025] Figure 4 It is an overall schematic diagram of the upper guide sleeve. DETAILED DESCRIPTION

[0026] 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 conjunction 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.

[0027] Example 1 An insulation assembly method for an upper guide sleeve of a hydro-turbine generator comprises the following steps: 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 distributed discontinuously on the outer side of the sleeve; the insulating glue can be distributed discontinuously at equal intervals 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 through the insulating glue on the outside of the sleeve; 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, and the insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials are mutually surrounded and fixed, and the insulating glue applied on the upper and lower insulating materials are staggered with each other in the radial direction of the sleeve; Step 4: If Figure 3 As shown, the copper tape is pre-installed on the sleeve, so as to inspect the copper tape. After the inspection is qualified, the copper tape is wrapped around the outer side of the inner insulating material, and is fixed to the inner insulating material by the insulating glue applied on the outer side of the inner insulating material; Step 5: Apply insulating glue on the outer side of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outer side of the copper tape; 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 the outer insulating material to 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.

[0028] The multiple layers of insulating materials 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 sequence, 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.

[0029] In the radial direction of the sleeve, each section of insulating glue on the outer side of the second layer of insulating material is located at the interval between each layer of insulating glue on the outer side of the first layer of insulating glue material; 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, and each section of insulating glue is intermittently 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 insulating materials are staggered from each other along the radial direction of the sleeve; the insulating glue in the inner and outer insulating materials are staggered from each other along the radial direction of the sleeve for the purpose of avoiding 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, and such a huge clamping force can easily cause local high points to damage the insulating material.

[0030] The outer insulating material includes a fourth insulating material, a fifth insulating material and a sixth insulating material; the fourth insulating material is wrapped around the outside of the copper tape and fits with the copper tape; the fifth insulating material is wrapped around the outside of the fourth insulating material and fits with the fourth insulating material; the sixth insulating material is wrapped around the outside of the fifth insulating material and fits with the fifth insulating material. In the radial direction of the sleeve, each section of insulating glue on the outside of the fifth insulating material is located at the interval between each layer of insulating glue on the outside of the fourth insulating material; the fourth insulating material, the fifth insulating material and the sixth insulating material are arranged from bottom to top in sequence, the fourth insulating material is the insulating material of the bottommost layer of the outer insulating material, and the sixth insulating material is the insulating material of the topmost layer of the outer insulating material; such as Figure 4 As shown, Figure 4 The 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 for the inner insulating material and the outer insulating material are both 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 heat-shrink process. If the number of layers of the inner insulating material and the outer insulating material are both more than three layers, during the heat-shrink process, it is easy to cause relative movement between the sleeve and the upper guide rotor in the axial direction.

[0031] The width of all the insulating glues in the present invention does not exceed 30 mm, and the spacing between each section of the insulating glue is 200 mm to 300 mm. 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; the insulating glue is selected as the brand 3M glue EC847; the diluent can be selected from acetone or ethyl acetate.

[0032] The inner insulating material and the outer insulating 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 insulating properties.

[0033] Example 2 An insulation assembly method for an upper guide sleeve of a hydro-turbine generator comprises the following steps: 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 distributed discontinuously on the outer side of the sleeve; the insulating glue can be distributed discontinuously at equal intervals 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 through the insulating glue on the outside of the sleeve; 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, and the insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials are mutually surrounded and fixed, and the insulating glue applied on the upper and lower insulating materials are staggered with each other in the radial direction of the sleeve; Step 4: If Figure 3 As shown, the copper tape is pre-installed on the sleeve, so as to inspect the copper tape. After the inspection is qualified, the copper tape is wrapped around the outer side of the inner insulating material, and is fixed to the inner insulating material by the insulating glue applied on the outer side of the inner insulating material; Step 5: Apply insulating glue on the outer side of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outer side of the copper tape; 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 the outer insulating material to 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 make heat-fitting difficult.

[0034] The multiple layers of insulating materials 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 sequence, 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.

[0035] In the radial direction of the sleeve, each section of insulating glue on the outer side of the second layer of insulating material is located at the interval between each layer of insulating glue on the outer side of the first layer of insulating glue material; like Figure 3As 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.

[0036] In step 4, the copper tape is wrapped around the outer side of the inner insulating material, and the specific steps of fitting and fixing the inner insulating material with the insulating glue applied on the outer side of the inner insulating material 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 the other half of the copper tape is still wrapped around the outside of the inner insulating material, and ensure that the other half of the copper tape is pressed tightly on the sleeve; 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 unfolded copper tape is pushed along the circumferential direction of the outer side of the exposed inner insulating material, so that the unfolded 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 adhesive; Step d: loosen the first end of the pre-installed copper tape, unfold the other half of the copper tape, and expose the outer side of the other half of the inner insulating material; Step e: Repeat steps b to c to complete the wrapping and fixing operation of the copper tape on the sleeve; install the copper tape to detect whether the inner insulating material and the outer insulating material are grounded; Figure 3 When the copper tape is bonded, the pushing direction should be that the unfolded copper tape is along the outer circumferential direction of the exposed inner insulating material, and is pushed, wrapped and wrapped around the outer side of the inner insulating material.

[0037] 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, and each section of insulating glue is intermittently 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 insulating materials are staggered from each other along the radial direction of the sleeve; the insulating glue in the inner and outer insulating materials are staggered from each other along the radial direction of the sleeve for the purpose of avoiding 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, and such a huge clamping force can easily cause local high points to damage the insulating material.

[0038] The multiple layers of insulating materials included in the outer insulating material are a fourth insulating material, a fifth insulating material and a sixth insulating material; the fourth insulating material is wrapped around the outside of the copper tape and fits with the copper tape; the fifth insulating material is wrapped around the outside of the fourth insulating material and fits with the fourth insulating material; the sixth insulating material is wrapped around the outside of the fifth insulating material and fits with the fifth insulating material in the radial direction of the sleeve, and each section of insulating glue on the outside of the fifth insulating material is located at the interval between each layer of insulating glue on the outside of the fourth insulating material; the fourth insulating material, the fifth insulating material and the sixth insulating material are arranged from bottom to top in sequence, the fourth insulating material is the insulating material of the bottommost layer of the outer insulating material, and the sixth insulating material is the insulating material of the topmost layer of the outer insulating material; such as Figure 4 As shown, Figure 4 The 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 for the inner insulating material and the outer insulating material are both 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 heat-shrink process. If the number of layers of the inner insulating material and the outer insulating material are both more than three layers, during the heat-shrink process, it is easy to cause relative movement between the sleeve and the upper guide rotor in the axial direction.

[0039] The width of all the insulating glues in the present invention does not exceed 30 mm, and the spacing between each section of the insulating glue is 200 mm to 300 mm. 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; the insulating glue is selected as the brand 3M glue EC847; the diluent can be selected from acetone or ethyl acetate.

[0040] The inner insulating material and the outer insulating 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 insulating properties.

[0041] 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 patent application scope of the present application. All equivalent changes or modified changes made under the technical spirit suggested by the present application should fall within the patent scope covered by the present application.

Claims

1. A method for insulating and assembling a guide sleeve on a hydro-turbine 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 through the insulating glue on the outside of the sleeve; Step 3: Between the multiple layers of insulating materials included in the inner insulating material, insulating glue is also applied to the outer sides of the multiple layers of insulating materials along the width direction of the insulating materials, and the insulating glue is intermittently distributed on the insulating materials, so that the multiple layers of insulating materials are mutually surrounded and fixed, and the insulating glue applied on the upper and lower layers of insulating materials are staggered with each other in 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 outer side of the copper tape along the axial direction of the copper tape, and make the insulating glue distributed discontinuously on the outer side of the copper tape; 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 the outer insulating material to complete the assembly.

2. The insulation assembly method of the upper guide sleeve of a hydro-turbine generator according to claim 1 is characterized in that: The multiple layers of insulating materials 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.

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

4. The insulation assembly method of the upper guide sleeve of a hydro-turbine generator according to claim 1 is 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 outer side of the inner insulating material, and the specific steps of fitting and fixing the inner insulating material with the insulating glue applied on the outer side of the inner insulating material 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 the other half of the copper tape is still 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 unfolded copper tape is pushed along the circumferential direction of the outer side of the exposed inner insulating material, so that the unfolded 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 adhesive; Step d: loosen the first end of the pre-installed copper tape, unfold the other half of the copper tape, and expose the outer side of the other half of the inner insulating material; Step e: Repeat steps b to c to complete the wrapping and fixing operation of the copper belt 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, and each section of insulating glue is distributed discontinuously on the insulating material, so that the multiple layers of insulating materials are surrounded 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 of 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 fits with the copper tape; the fifth layer of insulating material is wrapped around the outside of the fourth layer of insulating material and fits 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 fits with the fifth layer of insulating material.

8. The insulation assembly method of the upper guide sleeve of a hydro-turbine 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 of the upper guide sleeve of a hydro-turbine 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 of the upper guide sleeve of a hydro-turbine 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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