阅读说明：本技术 一种核电站稳压器电加热器加热管绝缘修复装置及方法 (Device and method for repairing insulation of heating pipe of electric heater of voltage stabilizer of nuclear power station ) 是由 何威 马琰钊 牛玉文 张志国 刘本生 蒋晓鹏 仲崇达 黄鹏飞 吕晨勇 王腾毅 王 于 2020-12-31 设计创作，主要内容包括：本发明涉及电气设备维修领域,具体涉及一种核电站稳压器电加热器加热管绝缘修复装置及方法,该装置包括上部组件、控制模块、下部组件、风机电机、隔热固定板、保温外壁、扇叶、加热内胆和固定支架；其中,上部组件与下部组件连接,控制模块与上部组件顶部连接,上部组件包括风机电机、隔热固定板、保温外壁和扇叶,隔热固定板连接在保温外壁顶部,风机电机与隔热固定板底面连接,扇叶与风机电机的下部连接；下部组件包括加热内胆和固定支架,加热内胆与固定支架连接。本发明能够修复稳压器电加热器加热管绝缘,提升加热器性能,保证稳压器的正常运行,同时降低维修成本,增加核电站的运行可靠性。(The invention relates to the field of maintenance of electrical equipment, in particular to a device and a method for repairing the insulation of a heating pipe of an electric heater of a voltage stabilizer of a nuclear power station, wherein the device comprises an upper component, a control module, a lower component, a fan motor, a heat insulation fixing plate, a heat insulation outer wall, fan blades, a heating inner container and a fixing support; the upper assembly is connected with the lower assembly, the control module is connected with the top of the upper assembly, the upper assembly comprises a fan motor, a heat insulation fixing plate, a heat insulation outer wall and fan blades, the heat insulation fixing plate is connected with the top of the heat insulation outer wall, the fan motor is connected with the bottom surface of the heat insulation fixing plate, and the fan blades are connected with the lower part of the fan motor; the lower component comprises a heating inner container and a fixed support, and the heating inner container is connected with the fixed support. The invention can repair the insulation of the heating pipe of the electric heater of the voltage stabilizer, improve the performance of the heater, ensure the normal operation of the voltage stabilizer, reduce the maintenance cost and increase the operation reliability of the nuclear power station.)

1. The utility model provides a stabiliser electric heater heating pipe insulation repair device which characterized in that: the device comprises an upper component (1), a control module (2), a lower component (3), a fan motor (4), a heat insulation fixing plate (5), a heat insulation outer wall (6), fan blades (9), a heating inner container (10) and a fixing support (13);

the upper assembly (1) is connected with the lower assembly (3), the control module (2) is connected with the top of the upper assembly (1), the upper assembly (1) comprises a fan motor (4), a heat insulation fixing plate (5), a heat insulation outer wall (6) and fan blades (9), the heat insulation fixing plate (5) is connected with the top of the heat insulation outer wall (6), the fan motor (4) is connected with the bottom surface of the heat insulation fixing plate (5), and the fan blades (9) are connected with the lower portion of the fan motor (4); the lower component (3) comprises a heating inner container (10) and a fixed support (13), and the heating inner container (10) is connected with the fixed support (13).

2. The device of claim 1, wherein the device comprises: the bottom of the heat-insulating outer wall (6) is welded and fixed with the upper flange (7).

3. The device of claim 2, wherein the device comprises: the bottom of the heating inner container (10) is welded and fixed with the fixed support (13) and the lower flange (11).

4. The device of claim 3, wherein the device comprises: the upper flange (7) is uniformly provided with a plurality of upper connecting holes (8).

5. The device of claim 4, wherein the device comprises: the lower flange (11) is uniformly provided with a plurality of lower connecting holes (12).

6. The device of claim 5, wherein the device comprises: the number of the fixed brackets (13) is multiple.

7. The device of claim 6, wherein the device comprises: the control module (2) comprises a temperature controller (14), a power switch (15), an air switch (16), a fuse (17), a contactor (18), a temperature measuring resistor (19), a contactor contact (20) and an alternating current power supply (21), wherein the power switch (15) is connected with the 380V alternating current power supply (21); the fuse (17) is connected with the power switch (15) and the contactor contact (20); the air switch (16) is connected with the single-phase power supply zero line of the power switch (15); the fan motor (4) is connected with an air switch (16); an I1 terminal of the temperature controller (14) is connected with a single phase of a 380V alternating current power supply (21), an I2 terminal of the temperature controller (14) is connected with a zero line of the 380V alternating current power supply (21), an Out1 terminal of the temperature controller (14) is connected with an A1 terminal of the contactor (18), and an Out2 terminal of the temperature controller (14) is connected with an A2 terminal of the contactor (18); the temperature measuring resistor (19) is connected to terminals P3, P2 and P1 of the temperature controller (14).

8. The method for repairing the insulation repairing device of the heating pipe of the electric heater of the voltage stabilizer according to claim 7, wherein: the method comprises the following steps:

connecting an upper connecting hole (8) and a lower connecting hole (12) of an insulation repairing device (23), connecting a fixing support (13) and an installation standby hole (25) of a heater flange (24) by using a bolt 26, fixing the insulation repairing device (23) on a heater, and positioning all electric heating pipes (22) of the heater in a heating inner container (10) of the device;

connecting the insulation repairing device (23) with a 380V alternating current power supply (21), closing a power switch (15), closing an air switch (16), electrifying a temperature controller (14), electrifying a fan motor (4) to start working, and internally circulating air in the insulation repairing device (23); closing a fuse (17), setting the target temperature on a temperature controller (14) to be 80 ℃, setting the heating time to be 2h, and at the moment, because the temperature measured by a temperature measuring resistor (19) is lower than 80 ℃, a 24V direct-current voltage is output by a terminal Out1 and a terminal Out2 of the temperature controller (14), a contactor (18) is electrified, a contactor contact (20) of the contactor is changed from an open circuit state to a closed state, a heating inner container (10) starts to work, and the temperature of air in the device is gradually increased and stabilized at 80 ℃; after heating for 2h, setting the target temperature on the temperature controller (14) to be 100 ℃, and the heating time to be 2 h; after heating for 2h, setting the target temperature on the temperature controller (14) to be 150 ℃, and continuing heating for 1 h;

step three, after the heating is finished, the air switch (16), the fuse (17) and the power switch (15) are switched off; and (3) dismantling a connecting bolt (26) between the fixing bracket (13) of the insulation repairing device (23) and the mounting standby hole (25) of the heater flange (24), and removing the insulation repairing device (23).

Technical Field

The invention relates to the field of maintenance of electrical equipment, in particular to a device and a method for repairing insulation of a heating pipe of an electric heater of a voltage stabilizer of a nuclear power station.

Background

The voltage stabilizer is an important component of a loop system of a nuclear power station, is provided with an electric heater group, is used as a component of a voltage stabilizing system, and is used for establishing the pressure of the loop under the heating working condition, maintaining the pressure under the steady state, limiting the pressure deviation under the transient working condition and cooling the voltage stabilizer at a set rate when a reactor device is cooled. The heating of the voltage stabilizer and the establishment of the pressure are realized by the electric heater of the voltage stabilizer, so the running state of the electric heater of the voltage stabilizer directly influences the performance of the voltage stabilizer and the working condition of a loop. At present, the end part of a heating pipe of a common voltage stabilizer electric heater in China is filled with an insulating material so as to ensure the insulating property of the electric heater. Because of the influence of high temperature in the nuclear island, high radioactivity, the insulating material of stabiliser electric heater heating tube tip can produce fracture or ageing phenomenon to reduce electric heater's performance, influence the stabiliser function, lead to the stabiliser to be unusable when serious, the unit shuts down and stops piling. When the insulation of the end part of the heating pipe of the electric heater of the voltage stabilizer is reduced, the maintenance strategy adopted at the present stage is generally the replacement of the whole group, and the problems of long manufacturing period and high maintenance cost exist.

Therefore, it is necessary to provide a device and a method for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer in the nuclear power plant, so as to solve the defects in the prior art.

Disclosure of Invention

The invention aims to provide a device and a method for repairing the insulation of a heating pipe of an electric heater of a voltage stabilizer of a nuclear power station, which can repair the insulation of the heating pipe of the electric heater of the voltage stabilizer, improve the performance of the heater, ensure the normal operation of the voltage stabilizer, reduce the maintenance cost and increase the operation reliability of the nuclear power station.

The technical scheme for realizing the purpose of the invention is as follows:

a heating pipe insulation repairing device of an electric heater of a voltage stabilizer of a nuclear power station comprises an upper component, a control module, a lower component, a fan motor, a heat insulation fixing plate, a heat insulation outer wall, fan blades, a heating inner container and a fixing support;

the upper assembly is connected with the lower assembly, the control module is connected with the top of the upper assembly, the upper assembly comprises a fan motor, a heat insulation fixing plate, a heat insulation outer wall and fan blades, the heat insulation fixing plate is connected with the top of the heat insulation outer wall, the fan motor is connected with the bottom surface of the heat insulation fixing plate, and the fan blades are connected with the lower part of the fan motor; the lower component comprises a heating inner container and a fixed support, and the heating inner container is connected with the fixed support.

The bottom of the heat-insulating outer wall is welded and fixed with the upper flange.

The bottom of the heating inner container is welded and fixed with the fixed support and the lower flange.

And a plurality of upper connecting holes are uniformly formed in the upper flange.

And a plurality of lower connecting holes are uniformly formed in the lower flange.

The fixed support has a plurality of.

The control module comprises a temperature controller, a power switch, an air switch, a fuse, a contactor, a temperature measuring resistor, a contactor contact and an alternating current power supply, wherein the power switch is connected with the 380V alternating current power supply; the fuse is connected with the power switch and the contactor contact; the air switch is connected with the single-phase power supply zero line of the power switch; the fan motor is connected with the air switch; an I1 terminal of the temperature controller is connected with a single phase of a 380V alternating current power supply, an I2 terminal of the temperature controller is connected with a zero line of the 380V alternating current power supply, an Out1 terminal of the temperature controller is connected with an A1 terminal of the contactor, and an Out2 terminal of the temperature controller is connected with an A2 terminal of the contactor; the temperature measuring resistor is connected with terminals P3, P2 and P1 of the temperature controller.

The repairing method of the insulating repairing device for the heating pipe of the electric heater of the voltage stabilizer comprises the following steps:

connecting an upper connecting hole and a lower connecting hole of an insulation repairing device, connecting a fixed support with an installation standby hole of a heater flange by using a bolt 26, so that the insulation repairing device is fixed on a heater, and at the moment, all electric heating pipes of the heater are positioned in a heating inner container of the device;

connecting the insulation repairing device with a 380V alternating-current power supply, closing a power switch, closing an air switch, electrifying a temperature controller at the moment, electrifying a fan motor to start working, and internally circulating air in the insulation repairing device; closing a fuse, setting the target temperature on a temperature controller to be 80 ℃, setting the heating time to be 2h, wherein at the moment, because the temperature measured by a temperature measuring resistor is lower than 80 ℃, a 24V direct-current voltage is output by a terminal Out1 and a terminal Out2 of the temperature controller, a contactor is electrified, a contact of the contactor is changed from an open circuit state to a closed state, a heating inner container starts to work, and the temperature of air in the device gradually rises and is stabilized at 80 ℃; after heating for 2 hours, setting the target temperature on the temperature controller to be 100 ℃, and setting the heating time to be 2 hours; after heating for 2h, setting the target temperature on the temperature controller to be 150 ℃, and continuing heating for 1 h;

step three, after the heating is finished, disconnecting the air switch, the fuse and the power switch; and (4) dismantling the connecting bolt between the fixing support of the insulation repairing device and the mounting standby hole of the heater flange, and removing the insulation repairing device.

The invention has the beneficial technical effects that:

(1) according to the device and the method for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer in the nuclear power station, the insulation repair of the end part of the heating pipe of the electric heater of the voltage stabilizer can be realized, and the performance of the electric heater is improved; the insulation of the end part of the heating pipe of the electric heater of the voltage stabilizer is repaired by refilling the insulating material and heating and baking, so that the reliability is high;

(2) according to the device and the method for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station, the maintenance cost caused by replacement due to insulation reduction of the heater can be reduced; meanwhile, the maintenance time caused by the fact that the heater is insulated and needs to be replaced can be saved, and therefore the major repair critical path time of the nuclear power station unit is shortened;

(3) the device and the method for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station have the advantages of low design and manufacturing cost, convenient assembly and disassembly and convenient maintenance;

(4) according to the device and the method for insulating and repairing the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station, the fan is used for generating internal air circulation, so that materials are uniformly heated during insulating and repairing, and the success rate of insulating and repairing is greatly improved;

(5) the upper component heat insulation fixing plate and the heat insulation outer wall of the device for insulating and repairing the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station adopt heat insulation materials, so that the heating performance of the device is improved, and the service lives of various elements are prolonged;

(6) the device and the method for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station have wide application range and can be used for the electric heaters of the voltage stabilizers of other nuclear power stations.

Drawings

FIG. 1 is a schematic view of an insulation repair device for a heating pipe of an electric heater of a voltage stabilizer in a nuclear power plant according to the present invention;

FIG. 2 is an electrical schematic diagram of a control module of a device for repairing the insulation of a heating pipe of an electric heater of a voltage stabilizer of a nuclear power plant, provided by the invention;

FIG. 3 is an assembly view of the device for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer in the nuclear power plant;

in the figure: 1-an upper assembly; 2-a control module; 3-a lower assembly; 4-a fan motor; 5-heat insulation fixing plate; 6-heat preservation outer wall; 7-upper flange; 8-upper connection hole; 9-fan blades; 10-heating the inner container; 11-lower flange; 12-lower connection hole; 13-fixing the bracket; 14-a temperature controller; 15-power switch; 16-an air switch; 17-a fuse; 18-a contactor; 19-temperature measuring resistor; 20-contactor contacts; 21-alternating current power supply; 22-an electric heating tube; 23-an insulation repair device; 24-a heater flange; 25-mounting a spare hole; 26-connecting bolt.

Detailed Description

In order to make those skilled in the art better understand the present invention, the technical solutions in the embodiments of the present invention will be described below in detail with reference to the drawings in the embodiments of the present invention. It should be apparent that the embodiments described below are only some, but not all, of the embodiments of the present invention. All other embodiments that can be derived by a person skilled in the art from the embodiments described herein without inventive step are within the scope of the present invention.

As shown in figure 1, the device for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer of the nuclear power station comprises an upper component 1, a control module 2, a lower component 3, a fan motor 4, a heat insulation fixing plate 5, a heat insulation outer wall 6, an upper flange 7, an upper connecting hole 8, fan blades 9, a heating inner container 10, a lower flange 11, a lower connecting hole 12, a fixing support 13, a temperature controller 14, a power switch 15, an air switch 16, a fuse 17 and a contactor 18

The upper assembly 1 is connected with the lower assembly 3, and the control module 2 is connected with the top of the upper assembly 1.

The upper assembly 1 comprises a heat insulation fixing plate 5 and a heat insulation outer wall 6, and the heat insulation fixing plate 5 is connected to the top of the heat insulation outer wall 6;

the fan motor 4 is connected with the bottom surface of the heat insulation fixed plate 5; the fan blade 9 is connected with the lower part of the fan motor 4;

the bottom of the heat-insulating outer wall 6 is welded and fixed with the upper flange 7; eight upper connecting holes 8 are formed in the upper flange 7, and the difference between every two connecting holes 8 is 45 degrees;

the lower component 3 comprises a heating inner container 10, a lower flange 11 and a fixed support 13, the heating inner container 10 is connected with the lower flange 11, and the fixed support 13 is connected with the heating inner container 10 and the lower flange 11;

3 fixed supports 13 are provided;

the heating inner container 10 is connected with a lower flange 11, eight lower connecting holes 12 are formed in the lower flange 11, and the difference between every two connecting holes 12 is 45 degrees;

as shown in fig. 2, the control module 2 includes a temperature controller 14, a power switch 15, an air switch 16, a fuse 17, a contactor 18, a temperature measuring resistor 19, a contactor contact 20 and an ac power supply 21, wherein the power switch 15 is connected with the 380V ac power supply 21; the fuse 17 is connected with the power switch 15 and the contactor contact 20; the air switch 16 is connected with the single-phase and power supply zero line of the power switch 15; the fan motor 4 is connected with an air switch 16; an I1 terminal of the temperature controller 14 is connected with a single phase of a 380V alternating current power supply 21, an I2 terminal of the temperature controller 14 is connected with a zero line of the 380V alternating current power supply 21, an Out1 terminal of the temperature controller 14 is connected with an A1 terminal of the contactor 18, and an Out2 terminal of the temperature controller 14 is connected with an A2 terminal of the contactor 18; the temperature measuring resistor 19 is connected to terminals P3, P2, and P1 of the temperature controller 14.

As shown in fig. 3, the invention also provides a repairing method of the device for repairing the insulation of the heating pipe of the electric heater of the voltage stabilizer in the nuclear power plant, which comprises the following steps:

firstly, connecting upper connecting holes 8 and lower connecting holes 12 of an insulation repair device 23 one by bolts, connecting a fixing support 13 with mounting spare holes 25 of a heater flange 24 by bolts 26, and fixing the insulation repair device 23 on a heater, wherein all electric heating pipes 22 of the heater are positioned in a heating inner container 10 of the device;

secondly, connecting the insulation repair device 23 with a 380V alternating current power supply 21, closing a power switch 15, closing an air switch 16, electrifying a temperature controller 14 at the moment, electrifying a fan motor 4 to start working, and internally circulating air in the device to ensure that the temperature in the device is uniform and the end part of a heating pipe is prevented from being heated unevenly due to local overheating; closing the fuse 17, setting the target temperature on the temperature controller 14 to be 80 ℃, setting the heating time to be 2h, wherein at the moment, because the temperature measured by the temperature measuring resistor 19 is lower than 80 ℃, the terminal Out1 and the terminal Out2 of the temperature controller 14 output 24V direct-current voltage, the contactor 18 is electrified, the contact 20 of the contactor is changed from an open circuit state to a closed state, the heating inner container 10 starts to work, and the temperature of air in the device is gradually increased and stabilized at 80 ℃; after heating for 2 hours, setting the target temperature on the temperature controller 14 to be 100 ℃ and the heating time to be 2 hours; after heating for 2h, setting the target temperature on the temperature controller 14 to be 150 ℃, and continuing heating for 1 h;

step three, after the heating is finished, the air switch 16, the fuse 17 and the power switch 15 are disconnected; and (3) dismantling the connecting bolts 26 between the device fixing bracket 13 and the mounting spare holes 25 of the heater flange 24, and removing the voltage stabilizer electric heating pipe repairing device 23.

The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.