Power plant thermal control system liquid level monitoring device

Abstract

The invention relates to the technical field of liquid level monitoring devices, in particular to a power plant thermal control system liquid level monitoring device which comprises a first barrel and a second barrel, the top of the first barrel is provided with an air vent, and the second barrel is arranged on the outer side wall of the first barrel in a communicated mode; the device further comprises a display assembly, a liquid inlet assembly, a control device, a discharge pipe, a first piston, a floating ball and a supporting rod, the discharge pipe is communicated with the second barrel, the first piston is arranged in the discharge pipe in an up-down sliding mode, the floating ball is arranged in the first barrel, the top end of the floating ball is connected with the bottom end of the supporting rod, and the supporting rod penetrates through the top of the first barrel in an up-down sliding mode. A display assembly is arranged on the floating ball and the supporting rod and used for displaying and alarming the liquid level, and a liquid inlet assembly is arranged on the lower portion of the first barrel; the automatic liquid discharging effect after the liquid level of external equipment is high is improved, the reliability of liquid discharging is improved, the energy consumption of liquid discharging is reduced, an alarm signal can be conveniently sent to personnel, and the use safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level monitoring devices, and particularly to a liquid level monitoring device for a thermal control system in a power plant. Background Art

[0002] In power production facilities such as thermal power plants and nuclear power plants, the thermal control system, as a core component to ensure the safe and efficient operation of the unit, undertakes the task of real-time monitoring and regulation of key process parameters. Among them, liquid level monitoring is a crucial link in the thermal control system. Especially in key equipment such as boiler steam drums, deaerators, high and low pressure heaters, and condensers, the accurate measurement of the liquid level is directly related to the stability of the system, energy utilization efficiency, and equipment life.

[0003] Currently, in existing liquid level monitoring devices, such as the patent with the authorization announcement number CN214427824U, this utility model includes: a control box, a measuring cylinder, a plurality of liquid level switches, and a plurality of drain pumps; wherein, the measuring cylinder is arranged inside the sump, and a plurality of liquid level switches are provided on the measuring cylinder to detect the liquid level in the sump; the drain pumps can be controlled to start draining through the control box to lower the liquid level.

[0004] However, it is found in the use of this device that this device needs to use drain pumps for drainage, which reduces the reliability of use and increases the energy consumption of drainage. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a liquid level monitoring device for a thermal control system in a power plant, which can improve the effect of automatically draining liquid when the liquid level of external equipment is relatively high, improve the reliability of liquid discharge, reduce the energy consumption of liquid discharge, facilitate sending an alarm signal to personnel, and improve the safety of use.

[0006] A liquid level monitoring device for a thermal control system of a power plant according to the present invention includes a first cylinder and a second cylinder. An air vent is provided at the top of the first cylinder, and the second cylinder is communicatively connected to the outer side wall of the first cylinder. It further includes a display component, a liquid inlet component, a control device, a discharge pipe, a first piston, a floating ball, and a support rod. The discharge pipe is communicatively connected to the second cylinder. The first piston is slidably arranged up and down in the discharge pipe. The floating ball is arranged in the first cylinder. The top end of the floating ball is connected to the bottom end of the support rod. The support rod slidably passes through the top of the first cylinder up and down. The liquid of the external device enters the interior of the first cylinder through the liquid inlet component. The liquid level of the external device is monitored through the first cylinder. When the liquid level in the external device is relatively high, the liquid in the first cylinder floats the floating ball upward. After the floating ball moves upward, it drives the support rod to move upward. A display component is arranged on the floating ball and the support rod. The display component is used to display and alarm the liquid level. The liquid inlet component is arranged at the lower part of the first cylinder. The liquid inlet component is used to make the liquid in the external device enter the first cylinder, and the liquid inlet component is used to filter the liquid entering the first cylinder. The control device is arranged on the first cylinder. The control device is used to control the up and down sliding of the first piston by using the movement of the support rod; thus, the support rod drives the first piston to move upward through the control device. After the first piston moves upward, the opening between the first cylinder and the second cylinder is opened, so that the liquid in the first cylinder is discharged outward through the second cylinder and the discharge pipe, thereby improving the effect of automatically discharging the liquid when the liquid level of the external device is relatively high, improving the reliability of liquid discharge, reducing the energy consumption of liquid discharge. At the same time, when the floating ball floats upward, the display component displays the high liquid level information, thereby facilitating the sending of an alarm signal to personnel and improving the use safety.

[0007] Preferably, the control device includes a straight rack, a gear, an arc rack, a bracket, a cross arm, and a connecting rod. The straight rack is arranged on the outer side wall of the support rod. The bracket is installed on the outer side wall of the first cylinder. The gear is rotatably installed on the bracket and meshes with the straight rack. The arc rack is installed at the end of the cross arm and meshes with the gear. The cross arm is rotatably installed on the bracket. The top end of the connecting rod is rotatably connected to the other end of the cross arm. The bottom end of the connecting rod is rotatably connected to the first piston. After the support rod moves upward, it drives the straight rack to move upward. The straight rack drives the arc rack to rotate downward through the meshing with the gear. After the arc rack rotates downward, it supports the left end of the cross arm to lift upward, so that the cross arm drives the first piston to slide upward through the connecting rod. After the first piston slides upward, it stops blocking between the first cylinder and the second cylinder, so that the liquid in the first cylinder is discharged outward through the discharge pipe, improving the effect of monitoring the liquid level of the liquid in the external device and automatically discharging the high liquid level at the same time. When the liquid level in the external device decreases, the liquid level in the first cylinder decreases accordingly. At this time, the floating ball and the support rod move downward under the action of gravity, so that the first piston slides downward to block the inside of the second cylinder, avoiding electronic failures through mechanical linkage and improving the reliability of use.

[0008] Preferably, the display component includes a third cylinder body, a second piston, a push rod, a top plate, a corrugated pipe, a ventilation pipe, and a transparent cover body. An opening is provided at the bottom end of the floating ball, and the third cylinder body is arranged at the opening of the floating ball. The second piston is slidably installed inside the third cylinder body. The bottom end of the push rod is connected to the top end of the second piston, and the top end of the push rod is connected to the bottom end of the top plate. The corrugated pipe is arranged at the top end of the top plate, and the top end of the corrugated pipe is connected to the inner side wall of the floating ball. A fluorescent liquid is arranged inside the corrugated pipe. A channel is arranged inside the support rod, and the transparent cover body is installed at the top end of the support rod and is communicated with the inside of the corrugated pipe through the channel. The ventilation pipe is communicatively arranged at the upper part of the outer side wall of the floating ball. When the liquid level in the first cylinder body rises and floats the floating ball upward, the pressure received at the bottom of the floating ball causes the second piston to slide upward. After the second piston slides upward, it pushes the top plate upward through the push rod, thereby compressing the corrugated pipe by the top plate, and further sending the fluorescent liquid inside the corrugated pipe to the inside of the transparent cover body through the channel, so as to facilitate the transparent cover body to send a high liquid level alarm message to personnel and improve the intuitiveness and convenience for personnel.

[0009] Preferably, the liquid inlet component includes an air suction device, a filter screen, a delivery tank, a first valve, a vertical pipe, an absorption hood, a motor, and a partition. The filter screen is arranged at the inner bottom of the first cylinder body, the delivery tank is communicatively arranged at the bottom end of the filter screen, the first valve is communicatively arranged between the delivery tank and external equipment, the vertical pipe is rotatably installed inside the filter screen and the delivery tank, the absorption hood is communicatively arranged on the vertical pipe, the motor is installed at the bottom end of the delivery tank, the output end of the motor is connected to the bottom end of the vertical pipe, the partition is arranged inside the delivery tank, an opening is provided at the lower part of the vertical pipe, and the opening communicates with the inside of the delivery tank below the partition. The suction device is communicatively connected to the delivery tank below the partition, and the suction device is used for sucking air inside the delivery tank. The liquid of external equipment is delivered to the inside of the delivery tank through the first valve, and after being filtered by the filter screen, it is delivered to the inside of the first cylinder body, so that the first cylinder body monitors the liquid of external equipment, reduces the dirt in the liquid from entering the inside of the first cylinder body, and improves the protection effect of the device. When it is necessary to clean the dirt filtered by the filter screen, the air suction device sucks air inside the delivery tank below the partition, so that the vertical pipe sucks air from the absorption hood, causing the absorption hood to extract the dirt attached to the inner side wall of the filter screen. At the same time, the motor drives the vertical pipe to rotate, and after the vertical pipe rotates, it drives the absorption hood to move circumferentially to clean different positions on the inner wall of the filter screen, improving the convenience of dirt cleaning.

[0010] Preferably, the air suction device includes a negative pressure tank, a delivery pipe, a second valve, and a vacuum pump. The delivery pipe is communicatively arranged between the negative pressure tank and the delivery tank, the second valve is communicatively arranged on the delivery pipe, and the vacuum pump is communicatively arranged at the top end of the negative pressure tank. The vacuum pump sucks air inside the negative pressure tank, so that the negative pressure tank sucks air inside the delivery tank through the delivery pipe, so that the delivery tank sucks air from the vertical pipe and the absorption hood, and the absorption hood delivers the absorbed dirt to the negative pressure tank for storage.

[0011] Preferably, it further includes a transparent tube, a floating block, and a thimble. The transparent tube is communicatively connected to the outer sidewall of the first cylinder body. The floating block is slidably arranged up and down in the transparent tube. The top end of the thimble is connected to the bottom end of the floating block. When the liquid of the external device enters the first cylinder body, the liquid in the first cylinder body enters the transparent tube, and the liquid makes the floating block float upward, so as to facilitate personnel to observe the position of the floating block to monitor the liquid.

[0012] Preferably, it further includes a counterweight block and a laser rangefinder. The counterweight block is installed on the outer sidewall of the support rod, and the laser rangefinder is installed on the outer sidewall of the first cylinder body, and the position of the laser rangefinder matches that of the counterweight block. When the support rod moves up and down, it drives the counterweight block to move. The height of the counterweight block is measured by the laser rangefinder, so as to facilitate the measurement and calculation of the liquid level height and improve the accuracy of liquid level monitoring.

[0013] Preferably, it further includes a flow sensor. The flow sensor is communicatively connected to the discharge pipe. When the liquid is discharged from the discharge pipe, the liquid flow is detected by the flow sensor, so as to facilitate sending an alarm message for a high liquid level.

[0014] Preferably, it further includes a controller and an alarm. The controller and the alarm are both installed on the outer sidewall of the first cylinder body. When the laser rangefinder measures the rising height of the counterweight block, and at the same time when the flow sensor detects the liquid flow in the discharge pipe, the laser rangefinder and the flow sensor send the information to the controller, so as to facilitate sending a high liquid level alarm through the alarm.

[0015] Preferably, it further includes a maintenance door. The maintenance door is arranged at the bottom of the first cylinder body. The filter screen and the conveying box are installed on the maintenance door. By disassembling the maintenance door, the convenience of cleaning and maintaining the filter screen and the conveying box is improved.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: improving the effect of automatic liquid discharge after the liquid level of the external device is relatively high, improving the reliability of liquid discharge, reducing the energy consumption of liquid discharge. At the same time, when the floating ball floats upward, the display component displays the high liquid level information, so as to facilitate sending an alarm signal to personnel and improving the use safety. Brief Description of the Drawings

[0017] Figure 1 is an isometric structural schematic diagram of the present invention; Figure 2 is an isometric structural schematic diagram of the connection between the second cylinder body and the discharge pipe, etc.; Figure 3 is an isometric partial structural schematic diagram of the connection between the support rod and the straight rack, etc.; Figure 4 is an isometric partial structural schematic diagram of the connection between the support rod and the transparent cover body, etc.; Figure 5 is an isometric partial structural schematic diagram of the connection between the vertical pipe and the absorption cover, etc.; Figure 6 It is a partial isometric structure schematic diagram of the connection between the negative pressure tank and the vacuum pump, etc.; Figure 7 It is a partial isometric structure schematic diagram of the connection between the floating block and the ejector pin, etc.; Figure 8 It is a partial isometric structure schematic diagram of the connection between the first cylinder and the transparent tube, etc.; Figure 9 It is an isometric structure schematic diagram of the connection between the first cylinder and the second cylinder, etc.; Figure 10 It is a partial isometric structure schematic diagram of the connection between the floating ball and the support rod, etc.

[0018] Reference numerals in the drawings: 101, the first cylinder; 102, the second cylinder; 103, the discharge pipe; 104, the first piston; 105, the floating ball; 106, the support rod; 201, the straight rack; 202, the gear; 203, the arc rack; 204, the bracket; 205, the cross arm; 206, the connecting rod; 301, the third cylinder; 302, the second piston; 303, the push rod; 304, the top plate; 305, the bellows; 306, the ventilation pipe; 307, the transparent cover; 401, the filter screen; 402, the conveying box; 403, the first valve; 404, the vertical pipe; 405, the absorption hood; 406, the motor; 407, the partition; 501, the negative pressure tank; 502, the conveying pipe; 503, the second valve; 504, the vacuum pump; 601, the transparent tube; 602, the floating block; 603, the ejector pin; 701, the counterweight; 702, the laser rangefinder; 801, the flow sensor; 901, the controller; 902, the alarm; 1001, the inspection door. Detailed implementation manners

[0019] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0020] Embodiment 1 A liquid level monitoring device for a thermal control system in a power plant according to the present invention includes a first cylinder body 101 and a second cylinder body 102. An air vent is provided at the top of the first cylinder body 101, and the second cylinder body 102 is communicatively connected to the outer side wall of the first cylinder body 101. It further includes a display component, a liquid inlet component, a control device, a discharge pipe 103, a first piston 104, a floating ball 105, and a support rod 106. The discharge pipe 103 is communicatively connected to the second cylinder body 102. The first piston 104 is slidably arranged up and down in the discharge pipe 103. The floating ball 105 is arranged in the first cylinder body 101. The top end of the floating ball 105 is connected to the bottom end of the support rod 106. The support rod 106 slidably passes through the top of the first cylinder body 101 up and down. A display component is arranged on the floating ball 105 and the support rod 106. The display component is used for displaying and alarming the liquid level. A liquid inlet component is arranged at the lower part of the first cylinder body 101. The liquid inlet component is used for allowing the liquid in an external device to enter the first cylinder body 101, and the liquid inlet component is used for filtering the liquid entering the first cylinder body 101. The control device is arranged on the first cylinder body 101. The control device is used for controlling the up and down sliding of the first piston 104 by using the movement of the support rod 106; The control device includes a straight rack 201, a gear 202, an arc rack 203, a bracket 204, a cross arm 205, and a connecting rod 206. The straight rack 201 is arranged on the outer side wall of the support rod 106. The bracket 204 is installed on the outer side wall of the first cylinder body 101. The gear 202 is rotatably installed on the bracket 204 and meshes with the straight rack 201. The arc rack 203 is installed at the end of the cross arm 205 and meshes with the gear 202. The cross arm 205 is rotatably installed on the bracket 204. The top end of the connecting rod 206 is rotatably connected to the other end of the cross arm 205. The bottom end of the connecting rod 206 is rotatably connected to the first piston 104; In this embodiment, the liquid of the external device enters the interior of the first cylinder body 101 through the liquid inlet component. The liquid level of the external device is monitored through the first cylinder body 101. When the liquid level in the external device is relatively high, the liquid in the first cylinder body 101 floats the floating ball 105 upward. After the floating ball 105 moves upward, it drives the support rod 106 to move upward. Thus, the support rod 106 drives the first piston 104 to move upward through the control device. After the first piston 104 moves upward, the opening between the first cylinder body 101 and the second cylinder body 102 is opened. Thus, the liquid in the first cylinder body 101 is discharged outward through the second cylinder body 102 and the discharge pipe 103. Thus, the effect of automatically discharging the liquid after the liquid level of the external device is relatively high is improved, the reliability of liquid discharge is improved, the energy consumption of liquid discharge is reduced. At the same time, when the floating ball 105 floats upward, the display component displays the high liquid level information. Thus, it is convenient to send an alarm signal to the personnel and the use safety is improved.

[0021] Embodiment 2 Based on Embodiment 1, a liquid level monitoring device for a thermal control system of a power plant according to the present invention, the display assembly includes a third cylinder body 301, a second piston 302, a push rod 303, a top plate 304, a bellows 305, a ventilation pipe 306 and a transparent cover body 307. An opening is provided at the bottom end of the floating ball 105. The third cylinder body 301 is arranged at the opening of the floating ball 105. The second piston 302 is slidably installed inside the third cylinder body 301. The bottom end of the push rod 303 is connected to the top end of the second piston 302. The top end of the push rod 303 is connected to the bottom end of the top plate 304. The bellows 305 is arranged at the top end of the top plate 304. The top end of the bellows 305 is connected to the inner side wall of the floating ball 105. And a fluorescent liquid is arranged inside the bellows 305. A channel is arranged inside the support rod 106. The transparent cover body 307 is installed at the top end of the support rod 106. And the transparent cover body 307 is communicated with the inside of the bellows 305 through the channel. The ventilation pipe 306 is communicated and arranged on the upper part of the outer side wall of the floating ball 105; It further includes a transparent tube 601, a floating block 602 and a thimble 603. The transparent tube 601 is communicated and arranged on the outer side wall of the first cylinder body 101. The floating block 602 is slidably arranged up and down inside the transparent tube 601. The top end of the thimble 603 is connected to the bottom end of the floating block 602; It further includes a counterweight block 701 and a laser rangefinder 702. The counterweight block 701 is installed on the outer side wall of the support rod 106. The laser rangefinder 702 is installed on the outer side wall of the first cylinder body 101. And the position of the laser rangefinder 702 matches that of the counterweight block 701; It further includes a flow sensor 801. The flow sensor 801 is communicated and arranged on the discharge pipe 103; It further includes a controller 901 and an alarm 902. Both the controller 901 and the alarm 902 are installed on the outer side wall of the first cylinder body 101; It further includes a maintenance door 1001. The maintenance door 1001 is arranged at the bottom of the first cylinder body 101. The filter screen 401 and the conveying box 402 are installed on the maintenance door 1001; In this embodiment, after the support rod 106 moves upward, it drives the straight rack 201 to move upward. The straight rack 201 drives the arc rack 203 to rotate downward through meshing with the gear 202. After the arc rack 203 rotates downward, it supports the left end of the cross arm 205 to lift upward, so that the cross arm 205 drives the first piston 104 to slide upward through the connecting rod 206. After the first piston 104 slides upward, it stops blocking between the first cylinder 101 and the second cylinder 102, so that the liquid in the first cylinder 101 is discharged outward through the discharge pipe 103, improving the liquid level monitoring of the liquid in the external device and the effect of automatic high liquid level discharge. When the liquid level in the external device decreases, the liquid level in the first cylinder 101 decreases accordingly. At this time, the float ball 105 and the support rod 106 move downward under gravity, so that the first piston 104 slides downward to block the inside of the second cylinder 102, avoiding electronic failures through mechanical linkage and improving the reliability of use. When the liquid level in the first cylinder 101 rises and floats the float ball 105 upward, the pressure received at the bottom of the float ball 105 causes the second piston 302 to slide upward. After the second piston 302 slides upward, it pushes the top plate 304 to move upward through the push rod 303, so that the top plate 304 compresses the corrugated pipe 305, and then the fluorescent liquid in the corrugated pipe 305 is transported to the inside of the transparent cover 307 through the channel, so as to facilitate the transparent cover 307 to send a high liquid level alarm message to personnel and improve the convenience for personnel to be intuitive.

[0022] Embodiment 3 On the basis of Embodiment 1, a liquid level monitoring device for a power plant thermal control system according to the present invention, the liquid inlet assembly includes a suction device, a filter screen 401, a delivery tank 402, a first valve 403, a vertical pipe 404, an absorption hood 405, a motor 406 and a partition plate 407. The filter screen 401 is arranged at the bottom inside the first cylinder 101. The delivery tank 402 is connected and arranged at the bottom end of the filter screen 401. The first valve 403 is connected and arranged between the delivery tank 402 and the external device. The vertical pipe 404 is rotatably installed inside the filter screen 401 and the delivery tank 402. The absorption hood 405 is connected and arranged on the vertical pipe 404. The motor 406 is installed at the bottom end of the delivery tank 402. The output end of the motor 406 is connected to the bottom end of the vertical pipe 404. The partition plate 407 is arranged inside the delivery tank 402. An opening is provided at the lower part of the vertical pipe 404, and the opening communicates with the inside of the delivery tank 402 below the partition plate 407. The suction device communicates with the delivery tank 402 below the partition plate 407, and the suction device is used for sucking air inside the delivery tank 402; The suction device includes a negative pressure tank 501, a delivery pipe 502, a second valve 503, and a vacuum pump 504. The delivery pipe 502 is communicatively connected between the negative pressure tank 501 and the delivery tank 402. The second valve 503 is communicatively connected to the delivery pipe 502. The vacuum pump 504 is communicatively connected to the top of the negative pressure tank 501. The liquid of the external device is delivered into the interior of the delivery tank 402 through the first valve 403, and after being filtered by the filter screen 401, it is delivered into the interior of the first cylinder 101, so that the first cylinder 101 monitors the liquid of the external device, reduces the dirt in the liquid from entering the interior of the first cylinder 101, and improves the protection effect of the device. When it is necessary to clean the dirt filtered by the filter screen 401, the suction device sucks air from the delivery tank 402 below the partition plate 407, so that the vertical pipe 404 sucks air from the absorption hood 405, and the absorption hood 405 extracts the dirt attached to the inner side wall of the filter screen 401. At the same time, the motor 406 drives the vertical pipe 404 to rotate, and after the vertical pipe 404 rotates, it drives the absorption hood 405 to move circumferentially to clean different positions on the inner wall of the filter screen 401, improving the convenience of dirt cleaning.

[0023] As Figures 1 to 10 shown, in a liquid level monitoring device of a power plant thermal control system according to the present invention, when it is working, the liquid of the external device enters the interior of the first cylinder 101 through the liquid inlet assembly, and the liquid level of the external device is monitored through the first cylinder 101. When the liquid level in the external device is relatively high, the liquid in the first cylinder 101 floats the floating ball 105 upward. After the floating ball 105 moves upward, it drives the support rod 106 to move upward, so that the support rod 106 drives the first piston 104 to move upward through the control device. After the first piston 104 moves upward, the opening between the first cylinder 101 and the second cylinder 102 is opened, so that the liquid in the first cylinder 101 is discharged outward through the second cylinder 102 and the discharge pipe 103. At the same time, when the floating ball 105 floats upward, the display assembly displays the high liquid level information.

[0024] The main functions achieved by the present invention are: 1. Automatically drain the liquid when the liquid level of the external device is relatively high, and improve the reliability of liquid discharge and reduce the energy consumption of liquid discharge through mechanical linkage; 2. Utilize the fluorescent liquid to be delivered into the interior of the transparent cover 307 through the channel, so as to facilitate the transparent cover 307 to send a high liquid level alarm message to the personnel, improving the convenience for the personnel to be intuitive; 3. Filter the liquid, reduce the dirt in the liquid from entering the interior of the first cylinder 101, improve the protection effect of the device, and at the same time improve the convenience of dirt cleaning; 4. Monitor the liquid through multiple monitoring methods to improve the reliability of monitoring.

[0025] The motor 406, vacuum pump 504, laser rangefinder 702, flow sensors 801, flow sensors 801 and alarm 902 of a liquid level monitoring device for a thermal control system in a power plant according to the present invention are purchased on the market. Those skilled in the art only need to install and operate them according to the attached operation manuals, without the need for creative labor from those skilled in the art.

[0026] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A liquid level monitoring device for a thermal control system of a power plant, comprising a first cylinder body (101) and a second cylinder body (102). An air vent is provided at the top of the first cylinder body (101), and the second cylinder body (102) is communicatively connected to the outer side wall of the first cylinder body (101); characterized in that, It further includes a display component, a liquid inlet component, a control device, a discharge pipe (103), a first piston (104), a floating ball (105) and a support rod (106). The discharge pipe (103) is communicatively arranged on the second cylinder body (102). The first piston (104) is slidably arranged up and down in the discharge pipe (103). The floating ball (105) is arranged in the first cylinder body (101). The top end of the floating ball (105) is connected to the bottom end of the support rod (106). The support rod (106) slidably passes through the top of the first cylinder body (101) up and down. A display component is arranged on the floating ball (105) and the support rod (106). The display component is used for displaying and alarming the liquid level. A liquid inlet component is arranged at the lower part of the first cylinder body (101). The liquid inlet component is used for enabling the liquid in an external device to enter the first cylinder body (101), and the liquid inlet component is used for filtering the liquid entering the first cylinder body (101). The control device is arranged on the first cylinder body (101). The control device is used for controlling the up and down sliding of the first piston (104) by using the movement of the support rod (106).

2. The liquid level monitoring device for a thermal control system of a power plant according to claim 1, wherein The control device includes a straight rack (201), a gear (202), an arc rack (203), a bracket (204), a cross arm (205) and a connecting rod (206). The straight rack (201) is arranged on the outer side wall of the support rod (106). The bracket (204) is installed on the outer side wall of the first cylinder body (101). The gear (202) is rotatably installed on the bracket (204) and meshes with the straight rack (201). The arc rack (203) is installed at the end of the cross arm (205) and meshes with the gear (202). The cross arm (205) is rotatably installed on the bracket (204). The top end of the connecting rod (206) is rotatably connected to the other end of the cross arm (205). The bottom end of the connecting rod (206) is rotatably connected to the first piston (104).

3. The liquid level monitoring device for a thermal control system of a power plant according to claim 1, characterized in that The display component includes a third cylinder body (301), a second piston (302), a push rod (303), a top plate (304), a corrugated pipe (305), a ventilation pipe (306) and a transparent cover body (307). An opening is arranged at the bottom end of the floating ball (105). The third cylinder body (301) is arranged at the opening of the floating ball (105). The second piston (302) is slidably installed inside the third cylinder body (301). The bottom end of the push rod (303) is connected to the top end of the second piston (302). The top end of the push rod (303) is connected to the bottom end of the top plate (304). The corrugated pipe (305) is arranged at the top end of the top plate (304). The top end of the corrugated pipe (305) is connected to the inner side wall of the floating ball (105). And a fluorescent liquid is arranged inside the corrugated pipe (305). A channel is arranged inside the support rod (106). The transparent cover body (307) is installed at the top end of the support rod (106). And the transparent cover body (307) is communicatively connected to the inside of the corrugated pipe (305) through the channel. The ventilation pipe (306) is communicatively arranged on the upper part of the outer side wall of the floating ball (105).

4. A liquid level monitoring device for a thermal control system of a power plant according to claim 1, characterized in that, The liquid inlet assembly includes a suction device, a filter screen (401), a delivery tank (402), a first valve (403), a vertical pipe (404), an absorption hood (405), a motor (406) and a partition plate (407). The filter screen (401) is arranged at the inner bottom of the first cylinder body (101). The delivery tank (402) is communicated and arranged at the bottom end of the filter screen (401). The first valve (403) is communicated and arranged between the delivery tank (402) and external equipment. The vertical pipe (404) is rotatably installed inside the filter screen (401) and the delivery tank (402). The absorption hood (405) is communicated and arranged on the vertical pipe (404). The motor (406) is installed at the bottom end of the delivery tank (402). The output end of the motor (406) is connected to the bottom end of the vertical pipe (404). The partition plate (407) is arranged inside the delivery tank (402). An opening is arranged at the lower part of the vertical pipe (404), and the opening is communicated with the inside of the delivery tank (402) below the partition plate (407). The suction device is communicated with the delivery tank (402) below the partition plate (407), and the suction device is used for sucking air inside the delivery tank (402).

5. The liquid level monitoring device for a thermal control system of a power plant according to claim 4, characterized in that, The suction device includes a negative pressure tank (501), a delivery pipe (502), a second valve (503) and a vacuum pump (504). The delivery pipe (502) is communicated and arranged between the negative pressure tank (501) and the delivery tank (402). The second valve (503) is communicated and arranged on the delivery pipe (502). The vacuum pump (504) is communicated and arranged at the top end of the negative pressure tank (501).

6. The liquid level monitoring device for a thermal control system of a power plant according to claim 1, characterized in that, It further includes a transparent pipe (601), a floating block (602) and a thimble (603). The transparent pipe (601) is communicated and arranged on the outer side wall of the first cylinder body (101). The floating block (602) is arranged to slide up and down inside the transparent pipe (601). The top end of the thimble (603) is connected to the bottom end of the floating block (602).

7. The liquid level monitoring device for a thermal control system of a power plant according to claim 1, characterized in that, It further includes a counterweight block (701) and a laser rangefinder (702). The counterweight block (701) is installed on the outer side wall of the support rod (106). The laser rangefinder (702) is installed on the outer side wall of the first cylinder body (101), and the position of the laser rangefinder (702) matches that of the counterweight block (701).

8. The liquid level monitoring device for a thermal control system of a power plant according to claim 1, wherein, It further includes a flow sensor (801). The flow sensor (801) is communicated and arranged on the discharge pipe (103).

9. The liquid level monitoring device for a power plant thermal control system according to claim 1, characterized in that, It further includes a controller (901) and an alarm (902). Both the controller (901) and the alarm (902) are installed on the outer side wall of the first cylinder body (101).

10. The liquid level monitoring device for a thermal control system of a power plant according to claim 4, characterized in that, It further includes a maintenance door (1001). The maintenance door (1001) is arranged at the bottom of the first cylinder body (101). The filter screen (401) and the delivery tank (402) are installed on the maintenance door (1001).

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