Main water inlet valve position signal detection system and main water inlet valve using same

Abstract

The utility model discloses a main water inlet valve position signal detection system and a main water inlet valve using the same, and belongs to the technical field of pumped storage equipment, the system comprises a PLC control cabinet, a stay wire type displacement sensor arranged on a servomotor piston cylinder body, a position pointer plate arranged on a crank arm, and a scale plate arranged on a main water inlet valve body, the scale plate is matched with the position pointer plate to display the opening degree of the main water inlet valve, a plurality of proximity travel switches used for detecting the position of the main water inlet valve are arranged on the scale plate, the proximity travel switches with two position signals are arranged at the same opening degree, and the PLC control cabinet is in control connection with the stay wire type displacement sensor and the proximity travel switches. The problems that in the prior art, main water inlet valve position signal detection is not high in reliability, signal feedback is not accurate enough, and stability is not high enough are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to pumped storage equipment technical field, concretely relates to a main water inlet valve position signal detection system and use the main water inlet valve of this detection system. BACKGROUND

[0002] The main water inlet valve of pumped storage power station is the important equipment for connecting and cutting off the water flow into the guide mechanism of the unit, and is also the core equipment for ensuring the safety of underground powerhouse and preventing the flooding of powerhouse. The opening and closing of the main water inlet valve of pumped storage power station is controlled through the sequence control process of computer monitoring system, and the position signal thereof is one of the important judgment conditions of unit control process, and the stability, reliability and precision thereof are directly related to the success of normal start and stop of the unit.

[0003] In the prior art, the mechanical travel switch is used for detecting the position signal of the main water inlet valve of pumped storage power station. During the opening and closing of the main water inlet valve, the position indicating device on the crank arm contacts the travel switch fixed on the main water inlet valve body to send the position signal, and the position signal is sent to the computer monitoring system after being judged by the two-select-two logic of the PLC of the main water inlet valve control system.

[0004] The current technical solution has the following problems in the running process:

[0005] (1) During the installation and debugging stage, the installation position of the mechanical travel switch needs to be adjusted according to the position of the main water inlet valve flap, but there is no fixed reference and no opening indication, which is not intuitive enough, and increases the difficulty and time of on-site installation and debugging;

[0006] (2) Due to the characteristics of high water head, frequent start and stop, complex operating conditions and the like of pumped storage unit, there is a certain water-induced vibration during the opening and closing of the main water inlet valve, and when it is just closed, the travel switch produces working fatigue due to long-time and frequent action and reset, which may cause installation position deviation, and is prone to looseness and jamming and the like, the detection distance deviates, the signal feedback is inaccurate, the stable operation of the unit is affected, and the operation and maintenance workload is increased;

[0007] (3) When a signal at a certain position is lost or not reset, the two-select-two signal judgment logic used at present will cause the computer monitoring system to fail to receive the position signal of the main water inlet valve, thereby causing the unit start and stop process to fail, the unit cannot operate normally, and the power station will be under examination pressure and economic loss.

[0008] Based on the above status, it is necessary to optimize the main water inlet valve position signal detection device to improve the above problems. Utility model content

[0009] The utility model aims at solving above-mentioned technical problem, proposes a main water inlet valve position signal detection system, high reliability, good stability, signal feedback is more accurate, logic judgement is more optimal.

[0010] In order to realize the above-mentioned application purpose, the technical scheme of the utility model is as follows:

[0011] A main water inlet valve position signal detection system, including PLC control cabinet, be located in the pull line type displacement sensor of servomotor piston cylinder body, be located in the position pointer board of elbow, be located in the scale board of main water inlet valve body, scale board and position pointer board cooperation show the opening of main water inlet valve, scale board is equipped with a plurality of proximity type travel switches for detecting the position of main water inlet valve, the same opening is equipped with two proximity type travel switches of position signal, and the PLC control cabinet is connected with the pull line type displacement sensor and the proximity type travel switch control.

[0012] Further, the same opening is equipped with two proximity type travel switches and is horizontally installed and fixed.

[0013] Further, the scale board is equipped with 0 ° ~ 90 ° scale for corresponding display main water inlet valve opening with the position pointer board.

[0014] Further, the 0 °, 45 °, 81 ° and 90 ° positions on the scale board are respectively equipped with two position signal travel switches.

[0015] Further, the position pointer board is connected on the elbow through the support piece I.

[0016] Further, the scale board is connected on the main water inlet valve body through the support piece II.

[0017] Further, the position pointer board is arc plate, and the scale board is arc plate.

[0018] Further, the proximity type travel switch is fixed on the scale board through the lock nut.

[0019] The main water inlet valve using the position signal detection system as described above, including main water inlet valve body, elbow, valve and servomotor, one end of servomotor is connected on the ground through the hinge piece, and the other end is hinged with the elbow, and the elbow is fixed with the valve through the shaft pin, and the elbow rotates and drives the valve to rotate, the pull line type displacement sensor is arranged on the servomotor piston cylinder body, the position pointer board is arranged on the elbow, and the scale board is arranged on the main water inlet valve body, and the PLC control cabinet is connected with the pull line type displacement sensor and the proximity type travel switch control.

[0020] Further, the pull line type displacement sensor is fixed above the servomotor piston cylinder body, and the other end of the pull rope of the pull line type displacement sensor is fixed on the elbow.

[0021] The utility model has the advantages of:

[0022] I. This utility model proposes a novel main inlet valve position signal detection system. It employs a combination of a proximity limit switch and a pull-wire displacement sensor to detect the main inlet valve position signal. During the opening / closing process of the main inlet valve, the position signal is output through the proximity limit switch on the scale plate, while the displacement signal is output through the pull-wire displacement sensor on the main inlet valve relay. These two different types of signals are input to the main inlet valve PLC controller, where a three-way selection logic is performed before being sent to the computer monitoring system. This detection system is well-suited to the inherent operating characteristic of water-induced vibration during the opening / closing process of the main inlet valve, as well as when it is just closed. It ensures that the main inlet valve position signal output is unaffected by vibration, position switch malfunction, or other adverse factors, exhibiting high stability and reliability.

[0023] II. In this utility model, two proximity limit switches are installed horizontally side by side at the same opening degree, and the position signals detected by the two proximity limit switches are redundant.

[0024] Third, in this utility model, the scale plate is provided with a 0°~90° scale for displaying the opening degree of the main water inlet valve in accordance with the position pointer plate. This facilitates cooperation with the scale plate and intuitively displays the opening degree of the main water inlet valve. It can intuitively reflect the current position of the main water inlet valve valve, reduce the difficulty of on-site installation and debugging of the proximity limit switch, and shorten the debugging time.

[0025] IV. In this utility model, two position signal limit switches are provided at the 0°, 45°, 81° and 90° positions on the scale plate, respectively corresponding to the main water inlet valve fully closed (0% opening), 50% opening, 90% opening and fully open (100% opening) positions.

[0026] VI. In this utility model, the position pointer plate is an arc-shaped plate, preferably a circular arc-shaped scale plate. The circular arc-shaped scale plate indicates the position of the main water inlet valve. The installation and debugging are not limited by the external dimensions of the main water inlet valve, and it has better versatility and a wider range of applications.

[0027] VII. In this utility model, the proximity limit switch is fixed to the scale plate by the anti-loosening nut, and the position signal can be adjusted according to the actual situation of the project site, which reduces the workload of on-site debugging, improves work efficiency, and reduces unnecessary operation and maintenance work, and the application effect is good.

[0028] 8. This utility model proposes a main water inlet valve that uses this position signal detection system. By using a proximity limit switch, a non-contact signal detection method, it effectively avoids the signal deviation and abnormality caused by position offset and jamming that are easy to occur when using mechanical limit switches. It also avoids mechanical wear caused by collisions, extends service life, and reduces maintenance workload and economic losses.

[0029] Nine, in the present application, based on the main water valve position signal detection system, can realize three one logic judgment main water valve position state, compared with the two one logic judgment of traditional detection system, increase the displacement signal criterion as redundancy, avoid due to a road proximity switch signal (loss after) (position signal) can not output, make the output of position signal more stable and reliable, thereby improving the unit operation stability. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the structure diagram of the main water valve full closing state in the utility model.

[0031] Figure 2 is the structure diagram of the main water valve full opening state in the utility model.

[0032] Figure 3 is the connection diagram of PLC control cabinet and pull wire type displacement sensor, proximity type travel switch.

[0033] Among them, 1, main water valve body;2, scale plate;3, proximity type travel switch;4, crank arm;5, position pointer plate;6, servomotor;7, pull wire type displacement sensor;8, PLC control cabinet;9, valve;10, shaft coupling;2.1, support II;5.1, support I;7.1, pull rope. DETAILED DESCRIPTION

[0034] The utility model will be further explained in detail in combination with examples, but the implementation mode of the utility model is not limited to this.

[0035] Example 1

[0036] This example is the most basic implementation, a kind of main water valve position signal detection system, belongs to pumped storage equipment technical field, refer to Figure 1 、 3 , including PLC control cabinet 8, pull wire type displacement sensor 7 for being arranged on servomotor 6 piston cylinder body, position pointer plate 5 for being arranged on crank arm 4, scale plate 2 for being arranged on main water valve body 1, scale plate 2 and position pointer plate 5 cooperate and show the opening of main water valve, scale plate 2 is equipped with a plurality of proximity type travel switches 3 for detecting the position of main water valve, the same opening is equipped with two proximity type travel switches 3 of position signal, PLC control cabinet 8 and pull wire type displacement sensor 7, proximity type travel switch 3 control connection.

[0037] In this embodiment, the main water inlet valve position signal detection system uses a non-contact detection signal method through the proximity travel switch 3, effectively avoiding the problems of signal deviation and abnormalities caused by position deviation and jamming of mechanical travel switches, and also avoiding the mechanical wear problems caused by long-term collision of mechanical limit switches, prolonging the service life, reducing the operation and maintenance workload and economic losses.

[0038] Embodiment 2

[0039] This embodiment is a further optimization of embodiment 1, the difference being that two proximity travel switches 3 are installed horizontally side by side on the same opening degree.

[0040] Embodiment 3

[0041] Compared with embodiments 1-2, the difference is that the scale plate 2 is provided with a 0°-90° scale for displaying the opening degree of the main water inlet valve corresponding to the position pointer plate 5. Figure 1

[0042] In this embodiment, the scale plate 2 with opening degree display can intuitively reflect the current position of the valve 9 of the main water inlet valve, facilitating on-site installation and debugging work and improving work efficiency.

[0043] Preferably, the 0°, 45°, 81° and 90° positions on the scale plate 2 are respectively provided with two position signal travel switches.

[0044] Embodiment 4

[0045] Compared with embodiments 1-3, the difference is that the position pointer plate 5 is connected to the toggle lever 4 through a support I 5.1, and the scale plate 2 is connected to the main water inlet valve body 1 through a support II 2.1. Figure 1 .

[0046] Preferably, the scale plate 2 is connected to the main water inlet valve body 1 through a support II 2.1.

[0047] Embodiment 5

[0048] Compared with embodiments 1-4, the difference is that the position pointer plate 5 is an arc plate, and the scale plate 2 is also an arc plate, and the arc-shaped position pointer plate 5 can detect multiple position signals at the same time, effectively avoiding the problem that the PLC cannot judge the signal of the mechanical position switch due to the failure to maintain or reset. Figure 1

[0049] Embodiment 6

[0050] Compared with embodiments 1-5, the difference is that the proximity travel switch 3 is fixed to the scale plate 2 through a locking nut.

[0051] Embodiment 7 ​​

[0052] In order to make the public understand the scheme, the main water inlet valve of a preferred structure is taken as an example to further illustrate the scheme.

[0053] The main water inlet valve comprises a main water inlet valve body 1, a crank arm 4, a valve 9 and a force amplifier 6, as shown in Figure 1 , Figure 1 The arrow direction represents the water flow direction, one end of the force amplifier 6 is connected to the ground through a hinge; the other end is hinged to the crank arm 4, the crank arm 4 is fixed to the valve 9 through a shaft coupling 10, the crank arm 4 rotates to drive the valve 9 to rotate, and a preferred structure of the main water inlet valve position signal detection system is used.

[0054] Referring to Figure 1 , 3 , the position signal detection system comprises a PLC control cabinet 8, a pull wire type displacement sensor 7 arranged on the piston cylinder of the force amplifier 6, a position pointer plate 5 arranged on the crank arm 4, a scale plate 2 arranged on the main water inlet valve body 1, the scale plate 2 cooperates with the position pointer plate 5 to display the opening degree of the main water inlet valve, and the scale plate 2 is provided with a proximity type travel switch 3 for detecting the position of the main water inlet valve.

[0055] In the embodiment, the pull wire type displacement sensor 7 is arranged on the piston cylinder of the force amplifier 6, the position pointer plate 5 is arranged on the crank arm 4, the scale plate 2 is arranged on the main water inlet valve body 1, and the PLC control cabinet 8 is in control connection with the pull wire type displacement sensor 7 and the proximity type travel switch 3.

[0056] In the embodiment, two proximity type travel switches 3 are horizontally arranged and fixed for the same opening degree.

[0057] In the embodiment, the scale plate 2 is provided with 0°-90° scale for corresponding display of the opening degree of the main water inlet valve with the position pointer plate 5. The 0°, 45°, 81° and 90° positions on the scale plate 2 are respectively provided with two position signal travel switches.

[0058] In the embodiment, the position pointer plate 5 is connected to the crank arm 4 through a support I 5.1; the scale plate 2 is connected to the main water inlet valve body 1 through a support II 2.1.

[0059] In the embodiment, the position pointer plate 5 is an arc plate; the scale plate 2 is also an arc plate.

[0060] In the embodiment, the proximity type travel switch 3 is fixed to the scale plate 2 through a lock nut.

[0061] In the embodiment, the pull wire type displacement sensor 7 is fixed above the piston cylinder of the force amplifier 6, and the other end of the pull rope 7.1 of the pull wire type displacement sensor 7 is fixed to the crank arm 4.

[0062] The working principle of the main water inlet valve with the position signal detection system:

[0063] The main water inlet valve mainly comprises a main water inlet valve body 1, a crank arm 4, a valve 9, a servomotor 6, and some sealing structures, hydraulic and electrical control systems, etc. One end of the servomotor 6 is connected and fixed in the concrete ground through a hinge; the other end is connected (hinged) with the crank arm 4, and the servomotor 6 makes extension and retraction movement and drives the crank arm 4 to rotate under the action of hydraulic driving force; the crank arm 4 is fixed with the valve 9 through a shaft coupling 10 to form a coaxial rotating body, and the crank arm 4 drives the valve 9 to rotate when rotating, so as to realize the opening and closing of the main water inlet valve.

[0064] When the main water inlet valve is opened / closed, the valve 9 rotates 90° clockwise / counter-clockwise, the crank arm 4 rotates synchronously with the valve 9, and the position state of the valve 9 can be fed back through the rotation angle of the crank arm 4. The scale plate 2 on the main water inlet valve body 1 has a scale, which can directly display the current opening degree of the valve 9; the position state signal of the valve 9 can be detected after the pointer plate fixed on the crank arm 4 passes through the proximity switch fixed on the scale plate 2 on the valve body; the pull rope 7.1 of the pull wire type displacement sensor 7 fixed on the servomotor 6 stretches / contracts with the opening / closing of the main water inlet valve, and outputs an analog quantity to feed back the opening degree of the main water inlet valve.

[0065] Specifically, referring to Figure 1 , 2 , during the process from full closing to full opening of the main water inlet valve, the valve 9 rotates 90° clockwise, and the pointer plate fixed on the crank arm 4 rotates synchronously. When the main water inlet valve is fully closed, referring to Figure 1 , the valve 9 is in a 90° state, corresponding to the full closing position of the main water inlet valve on the scale plate 2 of the valve body; when the valve 9 rotates to 45°, it corresponds to the 50% opening degree of the main water inlet valve on the scale plate 2 of the valve body; when the valve 9 rotates to 81°, it corresponds to the 90% opening degree of the main water inlet valve on the scale plate 2 of the valve body; and when the valve 9 rotates to 90°, it corresponds to the 100% opening degree of the main water inlet valve on the scale plate 2 of the valve body, i.e. the full opening position of the main water inlet valve, referring to Figure 2 .

[0066] Specifically, during the process from full opening to full closing of the main water inlet valve, the valve 9 rotates 90° counterclockwise, and the pointer plate fixed on the crank arm 4 rotates synchronously. When the main water inlet valve is fully opened, the valve 9 is in a 0° state, corresponding to the full opening position of the main water inlet valve on the scale plate 2; when the valve 9 rotates to 45°, it corresponds to the 50% opening degree of the main water inlet valve on the scale plate 2 of the valve body; when the valve 9 rotates to 81°, it corresponds to the 90% opening degree of the main water inlet valve on the scale plate 2 of the valve body; and when the valve 9 rotates to 90°, it corresponds to the 0% opening degree of the main water inlet valve on the scale plate 2 of the valve body, i.e. the full closing position of the main water inlet valve.

[0067] In this embodiment, the working principle of the pull wire displacement sensor 7: the pull wire displacement sensor is based on the pull wire expansion to drive the inner shaft rotation, and then generates resistance change through the high-precision potentiometer, and finally converts the change into standard current or voltage signal output. Specifically, when the linear displacement or angular displacement changes, the pull wire will expand and contract, driving the inner shaft to rotate. The inner shaft is provided with a high-precision potentiometer, and as the inner shaft rotates, the resistance value of the potentiometer changes. This resistance change is converted into a 4-20 mA analog signal output through the transmitter.

[0068] The working principle of the proximity switch: the proximity switch is an internal oscillator that generates an alternating magnetic field. When a metal object approaches this magnetic field and reaches the inductive distance, eddy currents will be generated in the metal target, which will cause the oscillation to attenuate and even stop. The change of the oscillator oscillation and stop is processed by the rear-stage amplification circuit and converted into a PNP switch signal, triggering the driving controller, so as to achieve the purpose of non-contact detection.

[0069] The electrical control principle of the main water inlet valve position signal: when the valve 9 is in a certain position state, the pull wire displacement sensor 7 and the proximity switch will output the current position state through analog and switching quantities to the PLC control cabinet 8 through the signal cable, realizing the detection of the position state of the main water inlet valve. Specifically, the main water inlet valve has four position states: full closing, 50% opening, 90% opening, and full opening. Each position is provided with two position signal travel switches. As long as the position signal of one of the position signal travel switches in each position state is detected, the PLC control cabinet 8 is considered as valid input. At the same time, the displacement sensor also outputs analog quantity to the PLC control cabinet 8. The PLC control cabinet 8 forms a three-to-one judgment logic after logical operation of the received switching quantity and analog quantity. The main water inlet valve position signal output by the PLC control cabinet 8 is used for the sequence control process control of the main water inlet valve, and is also output to the computer monitoring system for the sequence control process control of the unit.

[0070] In this embodiment, the proximity type travel switch 3, the scale plate 2 and the arc-shaped position pointer plate 5 are designed and pre-assembled as a whole, avoiding the problems of excessive deviation and insufficient action matching accuracy caused by on-site manufacturing and assembly.

Claims

1. A primary inlet valve position signal detection system characterized by: The utility model relates to a kind of main inlet valve position display device, including PLC control cabinet (8), be located on the pull wire type displacement sensor (7) of relay (6), be located on the position pointer plate (5) of elbow arm (4), be located on the scale plate (2) of main inlet valve body (1), scale plate (2) and position pointer plate (5) cooperation display main inlet valve opening, scale plate (2) is equipped with the several proximity travel switch (3) for detecting the position of main inlet valve, the same opening degree is equipped with two position signal proximity travel switch (3), PLC control cabinet (8) is connected with pull wire type displacement sensor (7), proximity travel switch (3) control.

2. A primary inlet valve position signal detection system according to claim 1, characterized in that: The same opening degree is equipped with two proximity travel switches (3) horizontally and side by side mounted and fixed.

3. The primary inlet valve position signal detection system of claim 1, wherein: Scale plate (2) is equipped with 0 °~90 ° scale for corresponding display main inlet valve opening with position pointer plate (5).

4. The primary inlet valve position signal detection system of claim 2, wherein: 0 °, 45 °, 81 ° and 90 ° position on scale plate (2) are respectively equipped with two position signal travel switches.

5. The primary inlet valve position signal detection system of claim 1, wherein: Position pointer plate (5) is connected on elbow arm (4) by support I (5.1).

6. The primary inlet valve position signal detection system of claim 1, wherein: Scale plate (2) is connected on main inlet valve body (1) by support II (2.1).

7. The primary inlet valve position signal detection system of claim 1, wherein: Position pointer plate (5) is arc plate;Scale plate (2) is arc plate.

8. The primary inlet valve position signal detection system of claim 1, wherein: Proximity travel switch (3) is fixed on scale plate (2) by lock nut.

9. A main water inlet valve using the position signal detection system according to any one of claims 1 to 8, characterized in that: Including main inlet valve body (1), elbow arm (4), valve (9) and relay (6), one end of relay (6) is connected on ground by hinged member;The other end is hinged with elbow arm (4), elbow arm (4) is fixed with valve (9) by coupling pin (10), elbow arm (4) rotates and drives valve (9) to rotate, pull wire type displacement sensor (7) is located on the piston cylinder of relay (6), position pointer plate (5) is arranged on elbow arm (4), scale plate (2) is arranged on main inlet valve body (1), PLC control cabinet (8) is connected with pull wire type displacement sensor (7), proximity travel switch (3) control.

10. The main inlet valve according to claim 9, characterized in that: Pull wire type displacement sensor (7) is fixed on the piston cylinder above of relay (6), the other end of pull wire of pull wire type displacement sensor (7) (7.1) is fixed on elbow arm (4).

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