A generator rotor maintenance device and method for a nuclear power plant

Abstract

The present invention provides a generator rotor maintenance device for a nuclear power plant, comprising a metal bellows air inlet, a pipeline pressure regulator, branch one, branch two; two metal bellows air outlets, two SMC hollow flange metal bellows air inlets, and two SMC hollow flanges. The gas passes through the metal bellows air inlet and the pipeline pressure regulator through the air bleed line and then enters branch one and branch two arranged on the left and right sides; the two metal bellows air outlets are respectively arranged on the outlet side of branch one and branch two; one end of each metal bellows air outlet away from the pipeline pressure regulator is connected to an SMC hollow flange metal bellows air inlet through an air bleed hose and then connected to the SMC hollow flange. The present invention also provides a maintenance method using the above-mentioned generator rotor maintenance device for a nuclear power plant. The present invention enables the maintenance gas pressure to be monitored and adjusted in real time, thereby achieving the purpose of continuous dehumidification of the generator rotor.

Description

Technical Field

[0001] The invention belongs to the field of electrical and ventilation technology, and in particular relates to a generator rotor maintenance device and method for a nuclear power plant. Background Art

[0002] At present, when the rotor of a nuclear power plant generator is being maintained after the rotor is removed, a large number of scaffolds need to be erected, covered with fireproof cloth, and hot air is blown to dry the rotor of the generator. This work not only fails to achieve the best maintenance effect, but also consumes a lot of man-hours, manpower, and maintenance costs. In addition, nuclear power plants are usually located at the seaside, and the air humidity is relatively high, so it is particularly important to use closed gas maintenance for the rotor of the generator.

[0003] Based on the above problems, it is urgent to design an improved generator rotor maintenance device and method. Summary of the invention

[0004] The main purpose of the present invention is to provide a generator rotor maintenance device and method for a nuclear power plant, so as to realize the fully enclosed gas maintenance of the generator rotor.

[0005] The technical solution adopted by the present invention is:

[0006] A generator rotor maintenance device for a nuclear power plant comprises a metal bellows air inlet, a pipeline voltage regulator, a first branch, a second branch, two metal bellows air outlets, two SMC hollow flange metal bellows air inlets, and two SMC hollow flanges.

[0007] The gas passes through the metal bellows air inlet, the air bleed line, and the pipeline pressure regulator before entering branch one and branch two on the left and right sides; the two metal bellows air outlets are respectively arranged on the outlet side of branch one and branch two; the end of each metal bellows air outlet away from the pipeline pressure regulator is connected to an SMC hollow flange metal bellows air inlet through an air bleed hose and then connected to the SMC hollow flange.

[0008] A manual regulating valve A and a manual regulating valve with a pressure gauge are arranged in sequence between the metal bellows air inlet and the pipeline pressure regulator.

[0009] A safety valve is also connected between the air inlet of the metal bellows and the manual regulating valve A via a metal three-way pipe.

[0010] The pipeline pressure regulator is connected to branch one and branch two respectively through a metal tee pipe.

[0011] A manual regulating valve C, a check valve and a flow meter are respectively arranged on the side of branch 1 and branch 2 close to the pipeline pressure regulator. The check valve is used to prevent gas backflow.

[0012] Each SMC hollow flange has four bolt holes on the back, which are connected to the fan seat ring bolt holes of the generator rotor.

[0013] The generator rotor maintenance device for a nuclear power plant is also provided with sealed flexible expansion joints at the SMC hollow flanges on both sides, and the generator rotor air inlet channel is closed by tightening the sealed flexible expansion joints.

[0014] The SMC hollow flange on one side of branch line 1 is connected to the bolt hole of the fan seat ring on the excitation side of the generator rotor through the sealed flexible expansion joint on the same side, so that the compressed air is blown into the excitation side of the generator rotor through branch line 1;

[0015] The SMC hollow flange on one side of branch two is connected to the bolt hole of the fan seat ring on the steam side of the generator rotor through a sealed flexible expansion joint on the same side, so that the compressed air is blown into the steam side of the generator rotor through branch two.

[0016] Two semicircular metal clamps are respectively arranged at the head and tail ends of each sealed flexible expansion joint. The semicircular metal clamps are integrally arranged with the sealed flexible expansion joint on the same side by crimping, and the sealed flexible expansion joint is fastened by a long rod screw.

[0017] The present invention also provides a method for maintaining a rotor of a nuclear power plant generator using the above-mentioned maintenance device for a rotor of a nuclear power plant generator, comprising the following steps:

[0018] S1: Open the manual regulating valve C of branch 1 and branch 2;

[0019] S2: Slowly open the manual regulating ball valve A, and then slowly open the manual regulating valve with pressure gauge;

[0020] S3: Observe that the pressure of the manual regulating valve with pressure gauge does not exceed 5kPa; observe that the flow meters of branch 1 and branch 2 should be consistent. When the flow rate of the flow meter in branch 1 is greater than the flow rate of the flow meter in branch 2, reduce the opening of the manual regulating valve C in branch 1; the same applies to branch 2;

[0021] S4: Check the wind speed of the radial ventilation holes of the generator rotor windings using an anemometer to ensure that the excitation side and steam side are consistent.

[0022] The beneficial effects achieved by the present invention are:

[0023] 1. Easy to implement, operate and maintain;

[0024] 2. To achieve the purpose of continuous dehumidification of the generator rotor;

[0025] 3. The maintenance gas pressure can be monitored and adjusted in real time;

[0026] 4. The maintenance effect of using flexible expansion joints to isolate air is more excellent;

[0027] 5. Save labor costs and shorten work cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the generator rotor maintenance device for nuclear power plants;

[0029] Figure 2 This is the top view of the SMC hollow flange;

[0030] Figure 3 This is the front view of the sealed flexible expansion joint.

[0031] Among them: 1 is the metal bellows air inlet; 2 is the manual regulating valve A; 3 is the manual regulating valve with pressure gauge; 4 is the pipeline pressure regulator; 7 is the manual regulating valve C; 8 is the check valve B; 10 is the flow meter; 11 is the safety valve; 12 is the metal bellows air outlet; 14 is the SMC hollow flange metal bellows air inlet; 16 is the SMC hollow flange; 18 is the sealed flexible expansion joint; 20 is the generator rotor; 21 is the metal tee pipe. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1-2 As shown, the present invention provides a generator rotor maintenance device for a nuclear power plant, including a metal bellows air inlet 1, a pipeline voltage regulator 4, a branch one, a branch two; two metal bellows air outlets 12, two SMC hollow flange metal bellows air inlets 14, and two SMC hollow flanges 16.

[0034] The gas passes through the metal bellows air inlet 1, the air bleed line, the pipeline pressure regulator 4, and then enters the branch 1 and branch 2 arranged on the left and right sides respectively; the two metal bellows air outlets 12 are respectively arranged on the outlet side of branch 1 and branch 2; the end of each metal bellows air outlet 12 away from the pipeline pressure regulator 4 is connected to an SMC hollow flange metal bellows air inlet 14 through an air bleed hose and then connected to the SMC hollow flange 16.

[0035] A manual regulating valve A2 and a manual regulating valve 3 with a pressure gauge are arranged in sequence between the metal bellows air inlet 1 and the pipeline pressure regulator 4.

[0036] A safety valve 11 is also connected between the metal bellows air inlet 1 and the manual regulating valve A2 via a metal three-way pipe 21 .

[0037] The pipeline pressure regulator 4 is connected to the branch 1 and the branch 2 respectively through a metal tee pipe 21 .

[0038] A manual regulating valve C7, a check valve 8 and a flow meter 10 are respectively arranged on one side of branch 1 and branch 2 close to the pipeline pressure regulator 4. The check valve is used to prevent gas from flowing back.

[0039] Four bolt holes are arranged on the back of each SMC hollow flange 16 and are connected to the bolt holes of the fan seat ring of the generator rotor 20 .

[0040] The generator rotor maintenance device for a nuclear power plant is also provided with sealed flexible expansion joints 18 at the SMC hollow flanges 16 on both sides, and the generator rotor air inlet passage is closed by fastening the sealed flexible expansion joints 18 .

[0041] The SMC hollow flange 16 on one side of branch line 1 is connected to the bolt hole of the fan seat ring on the excitation side of the generator rotor 20 through the sealed flexible expansion joint 18 on the same side, so that the compressed air is blown into the excitation side of the generator rotor through branch line 1;

[0042] The SMC hollow flange 16 on one side of the branch line 2 is connected to the steam side fan seat ring bolt hole of the generator rotor 20 through the sealed flexible expansion joint 18 on the same side, so that the compressed air is blown into the steam side of the generator rotor through the branch line 2.

[0043] Two semicircular metal clamps are respectively provided at the head and tail ends of each sealed flexible expansion joint 18. The semicircular metal clamps are integrally provided with the sealed flexible expansion joint 18 on the same side by crimping, and the sealed flexible expansion joint 18 is fastened by long rod screws.

[0044] The present invention also provides a method for maintaining a rotor of a nuclear power plant generator using the above-mentioned maintenance device for a rotor of a nuclear power plant generator, comprising the following steps:

[0045] S1: Open the manual regulating valve C7 of branch 1 and branch 2;

[0046] S2: Slowly open the manual regulating valve A2, and then slowly open the manual regulating valve 3 with pressure gauge;

[0047] S3: Observe that the pressure of the manual regulating valve 3 with pressure gauge does not exceed 5kPa; observe that the flowmeters 10 of branch 1 and branch 2 should be consistent. When the flow rate of the flowmeter 10 in branch 1 is greater than the flow rate of the flowmeter 10 in branch 2, reduce the opening of the manual regulating valve C7 in branch 1; the same applies to branch 2;

[0048] S4: Check the wind speed of the radial ventilation holes of the winding of the generator rotor 20 by an anemometer to ensure that the excitation side and the steam side are consistent.

[0049] The beneficial effects achieved by the present invention are:

[0050] 1. Easy to implement, operate and maintain;

[0051] 2. To achieve the purpose of continuous dehumidification of the generator rotor;

[0052] 3. The maintenance gas pressure can be monitored and adjusted in real time;

[0053] 4. The maintenance effect of using flexible expansion joints to isolate the air is better; 5. Save labor costs and shorten the work cycle.

Claims

1. A generator rotor maintenance device for a nuclear power plant, characterized in that: The invention comprises a metal bellows air inlet (1), a pipeline pressure regulator (4), a branch line 1, a branch line 2, two metal bellows air outlets (12), two SMC hollow flange metal bellows air inlets (14), and two SMC hollow flanges (16); gas passes through the metal bellows air inlet (1) and the pipeline pressure regulator (4) from the air bleed line and then enters the branch line 1 and the branch line 2 respectively arranged on the left and right sides; the two metal bellows air outlets (12) are respectively arranged on the outlet side of the branch line 1 and the branch line 2; one end of each metal bellows air outlet (12) away from the pipeline pressure regulator (4) is connected to an SMC hollow flange metal bellows air inlet (14) through an air bleed hose and then connected to the SMC hollow flange (16); the SMC hollow flanges on both sides are connected to the SMC hollow flanges (16). A sealed flexible expansion joint (18) is respectively arranged at the C hollow flange (16), and the air inlet channel of the generator rotor is closed by tightening the sealed flexible expansion joint (18); the SMC hollow flange (16) on one side of branch one is connected to the fan seat ring bolt hole on the excitation side of the generator rotor (20) through the sealed flexible expansion joint (18) on the same side; the SMC hollow flange (16) on one side of branch two is connected to the fan seat ring bolt hole on the steam side of the generator rotor (20) through the sealed flexible expansion joint (18) on the same side; two semicircular metal clamps are respectively arranged at the head and tail ends of each sealed flexible expansion joint (18), and the semicircular metal clamps are integrally arranged with the sealed flexible expansion joint (18) on the same side by crimping.

2. The generator rotor maintenance device for a nuclear power plant according to claim 1, characterized in that: A manual regulating valve A (2) and a manual regulating valve with a pressure gauge (3) are arranged in sequence between the metal bellows air inlet (1) and the pipeline pressure regulator (4).

3. The generator rotor maintenance device for a nuclear power plant according to claim 2, characterized in that: A safety valve (11) is also connected between the metal bellows air inlet (1) and the manual regulating valve A (2) via a metal three-way pipe (21).

4. The generator rotor maintenance device for a nuclear power plant as claimed in claim 3, characterized in that: The pipeline pressure regulator (4) is respectively connected to the first branch and the second branch via a metal tee pipe (21).

5. The generator rotor maintenance device for a nuclear power plant as claimed in claim 4, characterized in that: A manual regulating valve C (7), a check valve (8) and a flow meter (10) are respectively arranged on the side of branch one and branch two close to the pipeline pressure regulator (4).

6. The generator rotor maintenance device for a nuclear power plant as claimed in claim 5, characterized in that: The back side of each SMC hollow flange (16) is provided with four bolt holes, which are connected to the bolt holes of the fan seat ring of the generator rotor (20).

7. A method for maintaining a nuclear power plant generator rotor using the nuclear power plant generator rotor maintenance device as claimed in claim 6, characterized in that: The following steps are involved: S1: Open the manual regulating valve C (7) of branch 1 and branch 2; S2: Slowly open the manual regulating valve A (2), and then slowly open the manual regulating valve with pressure gauge (3); S3: Observe that the pressure of the manual regulating valve (3) with a pressure gauge does not exceed 5 kPa; observe that the flow meters (10) of branch 1 and branch 2 should be consistent. When the flow rate of the flow meter (10) in branch 1 is greater than the flow rate of the flow meter (10) in branch 2, reduce the opening of the manual regulating valve C (7) in branch 1; the same applies to branch 2; S4: Check the wind speed of the radial ventilation holes of the winding of the generator rotor (20) by using an anemometer to ensure that the wind speed on the excitation side and the steam side are consistent.

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