Hydropower station flood discharge deep hole pressure filling and releasing water seal bottom pressure measuring method and device

Abstract

The invention discloses a hydropower station flood discharge deep hole pressure filling and releasing water seal bottom pressure measuring method and device, and relates to the technical field of hydropower station flood discharge deep hole pressure filling and releasing water seal bottom pressure measurement. A wide-range pressure sensor is connected behind a first meter front valve, a high-precision pressure sensor water filling solenoid valve is connected in parallel through the front end of the first meter front valve, and the rear end of the high-precision pressure sensor water filling solenoid valve is connected with a high-precision pressure sensor after passing a second meter front valve. Meanwhile, a high-precision pressure sensor drainage electromagnetic valve is connected in parallel through the front end of the second meter front valve, and the rear end of the high-precision pressure sensor drainage electromagnetic valve is led out to a drainage ditch. According to the method, the requirements of wide-range measurement of the bottom pressure of the flood discharge deep hole pressure charging and discharging water seal of the hydropower station and high-precision measurement near 0 MPa can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of bottom pressure measurement of charging and discharging water seals for flood discharge deep holes in hydropower stations, and more specifically to the technical field of a method and device for measuring the bottom pressure of charging and discharging water seals for flood discharge deep holes in hydropower stations. Background Art

[0002] Charging and discharging water seals are often used in flood discharge deep holes of hydropower stations to ensure the sealing effect when the gate blocks water. Before the deep hole gate is opened, in order to avoid damage to the charging and discharging water seal caused by the movement of the gate, it is necessary to first perform a pressure relief operation on the charging and discharging water seal. After the bottom pressure of the charging and discharging water seal is slightly less than 0 MPa and it is ensured that the water seal pressure relief is completed, the deep hole gate can be opened; after the deep hole gate is closed, it is also necessary to perform a pressurization operation on the charging and discharging water seal. After the bottom pressure of the water seal system reaches a relatively large rated pressure, the sealing effect of the gate can be ensured. Therefore, the measurement of the bottom pressure of the charging and discharging water seal needs to meet a relatively large measurement range and have high measurement accuracy near 0 MPa.

[0003] The traditional method to measure the bottom pressure of the charging and discharging water seal is to select a large-range and high-precision pressure sensor (P2) that can cover the pressure change range of the water seal charging and discharging conditions as much as possible, and then take anti-interference measures in the pressure signal acquisition and processing circuit. However, due to the too large measurement range of the bottom pressure sensor of the charging and discharging water seal, it cannot guarantee high-precision measurement at 0 MPa pressure itself. Coupled with the interference of sediment at the bottom of the water seal on pressure measurement after long-term operation of charging and discharging, as well as too many interference factors in the industrial site, temperature drift of semiconductor electronic devices, and quality defects in anti-interference treatment construction, etc., after the pressure relief operation of the charging and discharging water seal, large errors often occur in the high-precision measurement of the bottom pressure near 0 MPa, which cannot meet the stable operation requirements of the charging and discharging water seal system in hydropower stations. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for measuring the bottom pressure of charging and discharging water seals for flood discharge deep holes in hydropower stations in order to solve the above technical problems. It can take into account the measurement of the large-range bottom pressure of the charging and discharging water seals for flood discharge deep holes in hydropower stations and the high-precision measurement requirements near 0 MPa, and can realize the sewage discharge of the pressure measurement part at the bottom of the charging and discharging water seal, prevent the adverse impact on pressure measurement caused by the accumulation of sediment at the bottom of the water seal, and ensure the stable operation of the charging and discharging water seal system in hydropower stations.

[0005] The present invention specifically adopts the following technical solutions to achieve the above purpose:

[0006] The first aspect of the present invention provides a device for measuring the bottom pressure of a flood discharge deep hole charging and discharging water seal in a hydropower station, which includes a maintenance manual valve, a first front meter valve, a wide-range pressure sensor, a high-precision pressure sensor water filling solenoid valve, a second front meter valve, a high-precision pressure sensor, a high-precision pressure sensor drainage solenoid valve, a connecting pipe, and an electrical control device;

[0007] One end of the connecting pipe is connected to the pressure measurement point at the bottom of the deep hole charging and discharging water seal device, and the other end is connected to the drainage ditch. The maintenance manual valve, the high-precision pressure sensor water filling solenoid valve, and the high-precision pressure sensor drainage solenoid valve are arranged on the connecting pipe in sequence according to the medium flow direction. A wide-range pressure sensor is arranged on the connecting pipe between the maintenance manual valve and the high-precision pressure sensor water filling solenoid valve, and a high-precision pressure sensor is arranged on the connecting pipe between the high-precision pressure sensor water filling solenoid valve and the high-precision pressure sensor drainage solenoid valve.

[0008] The electrical control device includes a power supply module, a control processor, an analog quantity acquisition module, a switch quantity output module, and a switch quantity output module; two-way pressure signals of the wide-range pressure sensor and the high-precision pressure sensor are collected through the analog quantity acquisition module, and after being processed by the control processor according to the control logic of the present invention, the high-precision pressure sensor water filling solenoid valve and the high-precision pressure sensor drainage solenoid valve are controlled through the switch quantity output module, so as to realize the measurement of a large range of the bottom pressure of the flood discharge deep hole charging and discharging water seal in the hydropower station and the high-precision measurement requirement at 0 MPa, and then the measured effective value of the bottom pressure of the pressure relief water seal is output through the switch quantity output module.

[0009] Specifically, as Figure 1 shown, a connecting pipe is led out from the pressure measurement point at the bottom of the deep hole charging and discharging water seal device, passes through the maintenance manual valve, is connected to the wide-range pressure sensor after passing through the first front meter valve, and at the same time, the high-precision pressure sensor water filling solenoid valve is connected in parallel at the front end of the first front meter valve. The rear end of the high-precision pressure sensor water filling solenoid valve is connected to the high-precision pressure sensor after passing through the second front meter valve, and at the same time, the high-precision pressure sensor drainage solenoid valve is connected in parallel at the front end of the second front meter valve. The rear end of the high-precision pressure sensor drainage solenoid valve is led out to the drainage ditch.

[0010] In this solution, after the electric control system exits control, the solenoid valve separates the high-precision pressure sensor from the bottom pressure sampling point of the charging and discharging water seal in the hydropower station in the natural state and keeps it in the state of draining and relieving pressure, which can effectively avoid the damage of the high-precision pressure sensor caused by over-range.

[0011] It can realize the sewage discharge of the pressure measurement part at the bottom of the charging and discharging water seal, prevent the adverse impact on pressure measurement caused by the accumulation of sediment at the bottom of the water seal, and ensure the stable operation of the charging and discharging water seal system in the hydropower station.

[0012] In one embodiment, the control processor includes a first logic module, a first comparison module, a second logic module, a second comparison module, a third logic module, a fourth logic module, a first delay-on module, an assignment module, a fifth logic module, a second delay-on module, an assignment module, a sixth logic module, and a seventh logic module.

[0013] The second aspect of the present invention provides a method for measuring the bottom pressure of a flood discharge deep hole filling and pressure-relieving water seal in a hydropower station. Using the above-mentioned device for measuring the bottom pressure of a flood discharge deep hole filling and pressure-relieving water seal in a hydropower station, the method includes the following steps:

[0014] S1. Implement the true / false judgment of the working condition readiness through the first logic module; if the wide-range pressure sensor measurement channel is normal, the high-precision pressure sensor measurement channel is normal, and the device is in the non-sewage mode, then judge that the working condition readiness is true; otherwise, judge that the working condition readiness is false.

[0015] S2. Implement the true / false judgment of enabling the high-precision pressure sensor through the less-than-or-equal-to first comparison module or the second logic module, the greater-than-or-equal-to second comparison module, and the third logic module.

[0016] S3. Implement using the measurement value of the wide-range pressure sensor as the measurement effective value of the bottom pressure of the filling and pressure-relieving water seal through the fourth logic module, the first delay-on module, and the assignment module.

[0017] S4. Implement using the measurement value of the high-precision pressure sensor as the measurement effective value of the bottom pressure of the filling and pressure-relieving water seal through the fifth logic module, the second delay-on module, and the assignment module.

[0018] S5. Implement the control of the high-precision pressure sensor water filling solenoid valve and the high-precision pressure sensor drainage solenoid valve through the sixth logic module or the seventh logic module; when the enabling of the high-precision pressure sensor is true and the device is in the non-sewage mode, the coils of the high-precision pressure sensor water filling solenoid valve and the high-precision pressure sensor drainage solenoid valve are simultaneously excited, the valve cores act, and the high-precision pressure sensor is put into use; otherwise, the coils of the high-precision pressure sensor water filling solenoid valve and the high-precision pressure sensor drainage solenoid valve are simultaneously demagnetized, the valve cores return, and the bottom pressure of the filling and pressure-relieving water seal is measured by the wide-range pressure sensor; if the sewage mode is manually or regularly triggered, the coil of the high-precision pressure sensor water filling solenoid valve is excited, the valve core acts, and the coil of the high-precision pressure sensor drainage solenoid valve is demagnetized, the valve core returns, and the accumulated sediment at the bottom pressure measurement part of the filling and pressure-relieving water seal can be discharged to the downstream drainage ditch to realize the sewage discharge function of the pressure measurement device.

[0019] In one embodiment, in step S2, the true or false judgment of the enabling of the high-precision pressure sensor is realized by a first comparison module or a second logic module less than or equal to, a second comparison module greater than or equal to, and a third logic module; the specific method is as follows:

[0020] S21. Manually set the input value and the output value of the high-precision pressure sensor. The output value of the high-precision pressure sensor should be less than the upper range of the pressure sensor, and the input setting value of the high-precision pressure sensor should be less than the output setting value.

[0021] S22. If the measured value of the wide-range pressure sensor is less than or equal to the input setting value of the high-precision pressure sensor, it indicates that the pressure at the bottom of the charging and discharging water seal gradually decreases and has entered the normal measurement range of the high-precision pressure sensor. If the working condition is ready to be true at this time, the enabling should be judged as true; after the enabling is true, the self-holding of the enabling of the high-precision pressure sensor is realized through the IN2 pin of the second logic module.

[0022] S23. If the measured value of the wide-range pressure sensor is greater than or equal to the output setting value of the high-precision pressure sensor, it indicates that the pressure at the bottom of the charging and discharging water seal gradually increases and may then gradually exceed the normal measurement range of the high-precision pressure sensor. Then, the enabling of the high-precision pressure sensor should be judged as false; at any time when the working condition is not ready, the enabling of the high-precision pressure sensor should be judged as false.

[0023] In one embodiment, the relationship among the upper measurement range of the high-precision pressure sensor, the output value of the high-precision pressure sensor, and the input value of the high-precision pressure sensor is as follows:

[0024] The upper measurement range of the high-precision pressure sensor ≥ the output value of the high-precision pressure sensor ≥ the input value of the high-precision pressure sensor.

[0025] Specifically, the selection of the range of the wide-range pressure sensor should be determined according to the normal working pressure range of the charging and discharging water seal of the flood discharge deep hole of the hydropower station, and a measurement margin of 1 / 3 should be reserved; the selection of the range of the high-precision pressure sensor should be determined according to the working pressure range of the start and stop of the vacuum pump of the charging and discharging water seal of the flood discharge deep hole of the hydropower station. Generally, a measurement margin of 1 / 3 should be reserved above and below the start and stop pressure range of the vacuum pump.

[0026] According to the actual experience of most flood discharge deep hole charging and discharging water seal projects of hydropower stations, preferably, the recommended range of the wide-range pressure sensor is -0.1 to +1.5 MPa, and the recommended range of the high-precision pressure sensor is -0.05 to +0.05 MPa; the recommended output value of the high-precision pressure sensor is 0.040 MPa, and the recommended input value of the high-precision pressure sensor is 0.035 MPa.

[0027] In one embodiment, in step S3, when the working conditions are ready and the enabling of the high-precision pressure sensor is false, after a delay of a stable time T1, the measured value of the wide-range pressure sensor is assigned to the effective measured value of the pressure at the bottom of the charging and discharging water seal.

[0028] The false enabling of the high-precision pressure sensor indicates that the pressure at the bottom of the charging and discharging water seal is much greater than 0 MPa. In this condition, the wide-range pressure sensor should be selected as the pressure measurement sensor for the bottom of the charging and discharging water seal. The first delay-on module can avoid the fluctuation of the measured pressure value output to the effective measured value caused by the momentary reset of the water filling solenoid valve of the high-precision pressure sensor and the drainage solenoid valve of the high-precision pressure sensor.

[0029] In one embodiment, the parameter value of the stable time T1 used by the first delay-on module should be determined according to the pressure fluctuation time caused by the reset of the water filling solenoid valve of the high-precision pressure sensor and the drainage solenoid valve of the high-precision pressure sensor, and a certain delay margin should be reserved, which can be determined according to the on-site test of the hydropower station; according to the actual experience of the charging and discharging water seal projects of the flood discharge deep holes of most hydropower stations, the preferred stable time T1 is recommended to be 3 seconds.

[0030] In one embodiment, in step S4, when the working conditions are ready and the enabling of the high-precision pressure sensor is true, after a delay of a stable time T2, the measured value of the high-precision pressure sensor is assigned to the effective measured value of the pressure at the bottom of the charging and discharging water seal);

[0031] The true enabling of the high-precision pressure sensor indicates that the pressure at the bottom of the charging and discharging water seal is close to 0 MPa. In this condition, the high-precision pressure sensor should be selected as the pressure measurement sensor for the bottom of the charging and discharging water seal. The second delay-on module can avoid the fluctuation of the measured pressure value output to the effective measured value caused by the momentary action of the water filling solenoid valve of the high-precision pressure sensor and the drainage solenoid valve of the high-precision pressure sensor.

[0032] In one embodiment, the parameter value of the stable time T2 used by the second delay-on module should be determined according to the pressure fluctuation time caused by the action of the water filling solenoid valve of the high-precision pressure sensor and the drainage solenoid valve of the high-precision pressure sensor, and a certain delay margin should be reserved, which can be determined according to the on-site test of the hydropower station; according to the actual experience of the charging and discharging water seal projects of the flood discharge deep holes of most hydropower stations, the preferred stable time T2 is recommended to be 5 seconds.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. It can automatically switch between the wide-range pressure sensor and the high-precision pressure sensor according to the actual change of the pressure at the bottom of the charging and discharging water seal, so as to take into account the measurement requirements of the large range of the pressure at the bottom of the charging and discharging water seal of the flood discharge deep hole of the hydropower station and the high-precision measurement near 0 MPa.

[0035] 2. The existing pressure charging and discharging water seal control equipment of the hydropower station flood discharge deep hole can be utilized. Only a pressure sensor and a solenoid valve need to be newly added, then connected to the existing controller, and the water seal system program is improved to implement this method, which is easy to implement and has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic structural diagram of a bottom pressure measuring device for a pressure charging and discharging water seal of a hydropower station flood discharge deep hole of the present invention.

[0038] Figure 2 It is a pressure measurement control logic diagram of a bottom pressure measuring device for a pressure charging and discharging water seal of a hydropower station flood discharge deep hole of the present invention.

[0039] Figure 3 It is a pressure switching timing diagram of Embodiment 1 of the present invention.

[0040] Reference numerals: M03 - maintenance manual valve, V01 - first valve before the meter, P1 - wide-range pressure sensor, YV01 - water filling solenoid valve for high-precision pressure sensor, V02 - second valve before the meter, P2 - high-precision pressure sensor, YV02 - drainage solenoid valve for high-precision pressure sensor;

[0041] PS - power supply module, CPU - control processor, AI - analog quantity acquisition module, DO - digital quantity output module, AO - digital quantity output module;

[0042] 01 - first logic module, 02 - first comparison module, 03 - second logic module, 04 - second comparison module, 05 - third logic module, 06 - fourth logic module, 07 - first delay on module, 08 - assignment module, 09 - fifth logic module, 10 - second delay on module, 11 - assignment module, 12 - sixth logic module, 13 - seventh logic module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] To make the technical problems, technical solutions, and technical effects of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0045] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] Embodiment 1

[0047] As Figure 1 shown, this embodiment provides a bottom pressure measuring device for the flood discharge deep hole filling and pressure relief water seal of a hydropower station, including a maintenance manual valve M03, a first front valve V01, a wide-range pressure sensor P1, a high-precision pressure sensor filling solenoid valve YV01, a second front valve V02, a high-precision pressure sensor P2, a high-precision pressure sensor drainage solenoid valve YV02, a connecting pipe, and an electrical control device;

[0048] One end of the connecting pipe is connected to the pressure measuring point at the bottom of the deep hole filling and pressure relief water seal device, and the other end is connected to the drainage ditch. The maintenance manual valve M03, the high-precision pressure sensor filling solenoid valve YV01, and the high-precision pressure sensor drainage solenoid valve YV02 are arranged on the connecting pipe in sequence according to the medium flow direction. A wide-range pressure sensor P1 is arranged on the connecting pipe between the maintenance manual valve M03 and the high-precision pressure sensor filling solenoid valve YV01, and a high-precision pressure sensor P2 is arranged on the connecting pipe between the high-precision pressure sensor filling solenoid valve YV01 and the high-precision pressure sensor drainage solenoid valve YV02.

[0049] The electrical control device includes a power supply module PS, a control processor CPU, an analog quantity acquisition module AI, a digital quantity output module DO, and an analog quantity output module AO; by the analog quantity acquisition module AI, two-way pressure signals of the wide-range pressure sensor P1 and the high-precision pressure sensor P2 are acquired, and after being processed by the control processor CPU according to the control logic of the present invention, the high-precision pressure sensor filling solenoid valve YV01 and the high-precision pressure sensor drainage solenoid valve YV02 are controlled through the digital quantity output module DO, so as to achieve the measurement of a large range of the bottom pressure of the flood discharge deep hole filling and pressure relief water seal of the hydropower station and the high-precision measurement requirement at 0 MPa, and then the measurement effective value of the final bottom pressure of the pressure relief water seal is output through the analog quantity output module AO.

[0050] Specifically, as Figure 1 shown, a connecting pipe is led out from the pressure measurement point at the bottom of the deep-hole filling and pressure-relieving water seal device, passes through the maintenance manual valve M03, and is connected to the wide-range pressure sensor P1 after passing through the first valve before the meter V01. At the same time, the water filling solenoid valve YV01 of the high-precision pressure sensor is connected in parallel at the front end of the first valve before the meter V01. The rear end of the water filling solenoid valve YV01 of the high-precision pressure sensor is connected to the high-precision pressure sensor P2 after passing through the second valve before the meter V02. At the same time, the drain solenoid valve YV02 of the high-precision pressure sensor is connected in parallel at the front end of the second valve before the meter V02. The rear end of the drain solenoid valve YV02 of the high-precision pressure sensor is led out to the drainage ditch.

[0051] In this solution, after the electric control system exits the control, the solenoid valve separates the high-precision pressure sensor P2 from the pressure sampling point at the bottom of the water seal of the hydropower station in the natural state and keeps it in the state of draining and relieving pressure, which can effectively avoid the damage of the high-precision pressure sensor P2 caused by over-range.

[0052] It can realize the sewage discharge at the pressure measurement part at the bottom of the filling and pressure-relieving water seal, prevent the adverse impact on pressure measurement caused by the accumulation of sediment at the bottom of the water seal, and ensure the stable operation of the filling and pressure-relieving water seal system of the hydropower station.

[0053] The control processor CPU includes a first logic module 01, a first comparison module 02, a second logic module 03, a second comparison module 04, a third logic module 05, a fourth logic module 06, a first delay-on module 07, an assignment module 08, a fifth logic module 09, a second delay-on module 10, an assignment module 11, a sixth logic module 12, and a seventh logic module 13.

[0054] Embodiment 2

[0055] As Figure 2 shown, this embodiment provides a method for measuring the bottom pressure of the filling and pressure-relieving water seal of the flood discharge deep hole of a hydropower station, including the following steps:

[0056] S1. Realize the true or false judgment of the working condition readiness through the first logic module 01; if the measurement channel of the wide-range pressure sensor P1 is normal, the measurement channel of the high-precision pressure sensor P2 is normal, and the device is in the non-sewage mode, then judge that the working condition readiness is true; otherwise, judge that the working condition readiness is false;

[0057] S2. Realize the true or false judgment of the enabling of the high-precision pressure sensor P2 through the less than or equal to the first comparison module 02 or the second logic module 03, greater than or equal to the second comparison module 04, and the third logic module 05; realize the true or false judgment of the enabling of the high-precision pressure sensor P2 through the less than or equal to the first comparison module 02 or the second logic module 03, greater than or equal to the second comparison module 04, and the third logic module 05; the specific method is as follows:

[0058] S21. Manually set the input value and the exit value of the high-precision pressure sensor P2. The exit value of the high-precision pressure sensor P2 should be less than the upper range of the P2 pressure sensor, and the input set value of the high-precision pressure sensor P2 should be less than the P2 exit set value;

[0059] S22. If the measured value of the wide-range pressure sensor P1 is less than or equal to the input set value of the high-precision pressure sensor P2, it indicates that the bottom pressure of the charging and discharging water seal is gradually decreasing and has entered the normal measurement range of the high-precision pressure sensor P2. If the working condition is ready to be true at this time, it should be judged that the P2 input enable is true; after the P2 input enable is true, the high-precision pressure sensor P2 input enable self-holding is realized through the IN2 pin of the second logic module 03;

[0060] S23. If the measured value of the wide-range pressure sensor P1 is greater than or equal to the exit set value of the high-precision pressure sensor P2, it indicates that the bottom pressure of the charging and discharging water seal is gradually increasing and may then gradually exceed the normal measurement range of the high-precision pressure sensor P2. Then, it should be judged that the high-precision pressure sensor P2 input enable is false; at any time when the working condition is not ready, it should be judged that the high-precision pressure sensor P2 input enable is false.

[0061] The relationship among the upper measurement range of the high-precision pressure sensor P2, the exit value of the high-precision pressure sensor P2, and the input value of the high-precision pressure sensor P2 is as shown in Equation 1:

[0062] The upper measurement range of the high-precision pressure sensor P2 ≥ the exit value of the high-precision pressure sensor P2 ≥ the input value of the high-precision pressure sensor P2.

[0063] Specifically, the selection of the range of the wide-range pressure sensor P1 should be determined according to the normal working pressure range of the charging and discharging water seal of the flood discharge deep hole of the hydropower station, and a measurement margin of 1 / 3 should be reserved; the selection of the range of the high-precision pressure sensor P2 should be determined according to the working pressure range of the start and stop of the vacuum pump of the charging and discharging water seal of the flood discharge deep hole of the hydropower station, and generally a measurement margin of 1 / 3 should be reserved above and below the start and stop pressure range of the vacuum pump.

[0064] Based on the actual engineering experience of the charging and discharging water seals of the flood discharge deep holes of most hydropower stations, preferably, the recommended range of the wide-range pressure sensor P1 is -0.1 to +1.5 MPa, and the recommended range of the high-precision pressure sensor P2 is -0.05 to +0.05 MPa; the recommended exit value of the high-precision pressure sensor P2 is 0.040 MPa, and the recommended input value of the high-precision pressure sensor P2 is 0.035 MPa.

[0065] S3. Select the measured value of the wide-range pressure sensor P1 as the measured effective value P0 of the bottom pressure of the charging and discharging water seal through the fourth logic module 06, the first delay-on module 07, and the assignment module 08. When the working conditions are ready and the enabling of the high-precision pressure sensor P2 is false, after a stable time T1 delay, assign the measured value of the wide-range pressure sensor P1 to the measured effective value P0 of the bottom pressure of the charging and discharging water seal.

[0066] The false enabling of the high-precision pressure sensor P2 indicates that the bottom pressure of the charging and discharging water seal is much greater than 0 MPa. In this working condition, the wide-range pressure sensor P1 should be selected as the measuring sensor for the bottom pressure of the charging and discharging water seal. The first delay-on module 07 can prevent the measured pressure value of P1 from fluctuating and being output to the measured effective value P0 due to the instantaneous reset of the water filling solenoid valve YV01 of the high-precision pressure sensor and the drain solenoid valve YV02 of the high-precision pressure sensor.

[0067] The parameter value of the stable time T1 used by the first delay-on module 07 should be determined according to the pressure fluctuation time caused by the reset of the water filling solenoid valve YV01 of the high-precision pressure sensor and the drain solenoid valve YV02 of the high-precision pressure sensor, and a certain delay margin should be reserved, which can be determined according to the on-site test of the hydropower station. According to the actual experience of most hydropower station flood discharge deep hole charging and discharging water seal projects, the preferred stable time T1 is recommended to be 3 seconds.

[0068] S4. Select the measured value of the high-precision pressure sensor P2 as the measured effective value P0 of the bottom pressure of the charging and discharging water seal through the fifth logic module 09, the second delay-on module 10, and the assignment module 11. When the working conditions are ready and the enabling of the high-precision pressure sensor P2 is true, after a stable time T2 delay, assign the measured value of the high-precision pressure sensor P2 to the measured effective value P0 of the bottom pressure of the charging and discharging water seal.

[0069] The true enabling of the high-precision pressure sensor P2 indicates that the bottom pressure of the charging and discharging water seal is close to 0 MPa. In this working condition, the high-precision pressure sensor P2 should be selected as the measuring sensor for the bottom pressure of the charging and discharging water seal. The second delay-on module 10 can prevent the measured pressure value from fluctuating and being output to the measured effective value P0 due to the instantaneous action of the water filling solenoid valve YV01 of the high-precision pressure sensor and the drain solenoid valve YV02 of the high-precision pressure sensor.

[0070] The parameter value of the stable time T2 used by the second delay-on module 10 should be determined according to the pressure fluctuation time caused by the action of the water filling solenoid valve YV01 of the high-precision pressure sensor and the drain solenoid valve YV02 of the high-precision pressure sensor, and a certain delay margin should be reserved, which can be determined according to the on-site test of the hydropower station. According to the actual experience of most hydropower station flood discharge deep hole charging and discharging water seal projects, the preferred stable time T2 is recommended to be 5 seconds.

[0071] S5. The control of the water filling solenoid valve YV01 of the high-precision pressure sensor and the water discharging solenoid valve YV02 of the high-precision pressure sensor is realized through the sixth logic module 12 or the seventh logic module 13. When the high-precision pressure sensor P2 is enabled and is in the non-sewage discharge mode, the coils of the water filling solenoid valve YV01 of the high-precision pressure sensor and the water discharging solenoid valve YV02 of the high-precision pressure sensor are simultaneously excited, the valve core acts, and the high-precision pressure sensor P2 is put into use. Otherwise, the coils of the water filling solenoid valve YV01 of the high-precision pressure sensor and the water discharging solenoid valve YV02 of the high-precision pressure sensor are simultaneously demagnetized, the valve core returns, and the pressure at the bottom of the charging and pressure-relieving water seal is measured by the wide-range pressure sensor P1. If the sewage discharge mode is triggered manually or regularly, the coil of the water filling solenoid valve YV01 of the high-precision pressure sensor is excited, the valve core acts, the coil of the water discharging solenoid valve YV02 of the high-precision pressure sensor is demagnetized, and the valve core returns, so that the accumulated sediment at the pressure measuring part at the bottom of the charging and pressure-relieving water seal can be discharged to the downstream drainage ditch, realizing the sewage discharge function of the pressure measuring device.

[0072] Embodiment 3

[0073] Taking the measurement of the pressure at the bottom of the charging and pressure-relieving water seal of the flood discharge deep hole of a certain hydropower station as an example, the specific implementation method of this patent is described.

[0074] After the water seal system is pressurized, the pressure is about 1.2 MPa. After the water seal system is depressurized, the bottom pressure will gradually decrease to around 0 MPa. When the bottom pressure is lower than 0.01 MPa, it can be considered that the water seal system has drained completely, and the vacuum pump can be started. After the vacuum pump runs, the pressure of the water seal system can be reduced to -0.02 MPa. When the pressure is lower than -0.01 MPa after the vacuum pump runs, it can be determined that the vacuum pumping is successful.

[0075] If the traditional pressure measurement method is used to detect the pressure at the bottom of the charging and pressure-relieving water seal of the flood discharge deep hole of this hydropower station, only one wide-range pressure sensor P1 with parameters of -0.1~1.5 MPa / 4~20 mA is used. Then, after the water seal system is depressurized, the signal current change amount of the bottom pressure in the range of -0.02 M~+0.01 MPa near 0 MPa is only 0.3 mA (4.8~5.1 mA). Considering various interference factors in actual engineering measurement, obviously, only using one wide-range pressure sensor P1 cannot achieve high-precision measurement of the bottom pressure near 0 MPa, resulting in the inability to meet the stable operation requirements of the charging and pressure-relieving water seal system of the hydropower station.

[0076] Such as Figure 3As shown, this solution is adopted to detect the bottom pressure of the flood discharge deep hole filling and pressure relief water seal of the hydropower station. Two different pressure sensor combinations are used to meet the measurement requirements of a large range of bottom pressure of the flood discharge deep hole filling and pressure relief water seal of the hydropower station and high-precision measurement near 0 MPa. The parameters of the wide-range pressure sensor P1 are -0.1~1.5 MPa / 4~20 mA; the parameters of the high-precision pressure sensor P2 are

[0077] -0.05 MPa~+0.05 MPa / 4 - 20 mA. The withdrawal value of the high-precision pressure sensor P2 is set to 0.04 MPa, and the input value of P2 is set to 0.035 MPa. After the water seal system is depressurized, when the pressure is lower than the input value of P2, which is 0.035 MPa, this solution uses the P2 pressure sensor to measure the bottom pressure. In this way, the signal current change amount can reach 4.8 mA 8.8~13.6 mA in the range of -0.02 M~+0.01 MPa near 0 MPa. Compared with the traditional pressure measurement method, the signal current change amount is only 0.3 mA, which significantly enhances the measurement accuracy of the bottom pressure of the water seal near 0 MPa and ensures the stable operation of the filling and pressure relief water seal system of the hydropower station.

[0078] In addition, the traditional pressure measurement method does not set an electronically controlled sewage discharge function and cannot cope with the adverse effects caused by sediment accumulation at the bottom pressure measurement part on the pressure measurement sensor. After adopting the present invention, the sewage discharge mode can be triggered manually or regularly, and the high-precision pressure sensor water filling solenoid valve YV01 and the high-precision pressure sensor drain solenoid valve YV02 are controlled by the control device to realize the sewage discharge of sediment, so as to ensure that the measurement accuracy of the bottom pressure of the filling and pressure relief water seal system is not affected by sediment.

Claims

1. A device for measuring the bottom pressure of a water seal for a deep hole of a hydropower station, characterized in that: It includes a maintenance hand valve (M03), a first meter front valve (V01), a wide-range pressure sensor (P1), a high-precision pressure sensor water filling solenoid valve (YV01), a second meter front valve (V02), a high-precision pressure sensor (P2), a high-precision pressure sensor water discharge solenoid valve (YV02), connecting pipes and electrical control devices; One end of the connecting pipe is connected to the pressure measuring point at the bottom of the deep hole pressure filling and relief water seal device, and the other end is connected to the drainage ditch. The maintenance hand valve (M03), the high-precision pressure sensor water filling solenoid valve (YV01), and the high-precision pressure sensor drainage solenoid valve (YV02) are arranged on the connecting pipe in sequence according to the flow direction of the medium. A wide-range pressure sensor (P1) is arranged on the connecting pipe between the maintenance hand valve (M03) and the high-precision pressure sensor water filling solenoid valve (YV01), and a high-precision pressure sensor (P2) is arranged on the connecting pipe between the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02); The electrical control device comprises a power supply module (PS), a control processor (CPU), an analog quantity acquisition module (AI), a switch output module (DO) and a switch output module (AO); the analog quantity acquisition module (AI) acquires two pressure signals of a wide-range pressure sensor (P1) and a high-precision pressure sensor (P2), and after passing through the control processor (CPU), the switch output module (DO) controls the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor water discharge solenoid valve (YV02), thereby achieving a wide range measurement of the bottom pressure of the filling and relief water seal of the deep hole of the hydropower station and the high-precision measurement requirements at 0MPa, and then outputs the final measured effective value of the bottom pressure of the relief water seal through the switch output module (AO).

2. A device for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 1, characterized in that: The control processor (CPU) comprises a first logic module (01), a first comparison module (02), a second logic module (03), a second comparison module (04), a third logic module (05), a fourth logic module (06), a first delay connection module (07), a first assignment module (08), a fifth logic module (09), a second delay connection module (10), a second assignment module (11), a sixth logic module (12) and a seventh logic module (13).

3. A method for measuring the bottom pressure of a water seal in a deep hole for flood discharge in a hydropower station, characterized in that: A device for measuring the bottom pressure of a water seal of a deep flood discharge hole of a hydropower station as described in claim 2 is used.

4. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 3, characterized in that: The steps include: S1, determining whether the working condition is ready is true or false by communicating with the first logic module (01); if the measurement channel of the wide-range pressure sensor (P1) is normal, the measurement channel of the high-precision pressure sensor (P2) is normal, and the device is in a non-drainage mode, determining that the working condition is ready is true; otherwise, determining that the working condition is ready is false; S2, realizing true or false judgment of whether the high-precision pressure sensor (P2) is enabled by being less than or equal to the first comparison module (02) or the second logic module (03), being greater than or equal to the second comparison module (04), and the third logic module (05); S3, selecting the measurement value of the wide-range pressure sensor (P1) as the effective measurement value (P0) of the bottom pressure of the charging and releasing water seal through the fourth logic module (06), the first delay connection module (07), and the first assignment module (08); S4, selecting the measurement value of the high-precision pressure sensor (P2) as the effective measurement value (P0) of the bottom pressure of the charging and releasing water seal through the fifth logic module (09), the second delay connection module (10), and the second assignment module (11); S5, realize the control of the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02) by communicating with the sixth logic module (12) or the seventh logic module (13); when the high-precision pressure sensor (P2) is enabled and is in the non-drainage mode, the coils of the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02) are simultaneously energized, the valve core is actuated, and the high-precision pressure sensor (P2) is put into use; otherwise, the high-precision pressure sensor The coils of the water filling solenoid valve (YV01) and the high-precision pressure sensing drainage solenoid valve (YV02) are demagnetized at the same time, the valve core is restored, and the bottom pressure of the filling and releasing pressure water seal is measured by the wide-range pressure sensor (P1); if the sewage discharge mode is triggered manually or regularly, the coil of the high-precision pressure sensor water filling solenoid valve (YV01) is energized, the valve core is actuated, the coil of the high-precision pressure sensing drainage solenoid valve (YV02) is demagnetized, and the valve core is restored, so that the accumulated sediment at the pressure measuring part at the bottom of the filling and releasing pressure water seal can be discharged to the downstream drainage ditch, realizing the sewage discharge function of the pressure measuring device.

5. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 4, characterized in that: In step S2, the high-precision pressure sensor (P2) is enabled to be judged true or false by being less than or equal to the first comparison module (02) or the second logic module (03), greater than or equal to the second comparison module (04), and the third logic module (05); the specific method is as follows: S21. Manually set the input value and the exit value of the high-precision pressure sensor (P2). The exit value of the high-precision pressure sensor (P2) should be smaller than the upper range of the (P2) pressure sensor, and the input setting value of the high-precision pressure sensor (P2) should be smaller than the exit setting value of (P2); S22, if the actual measured value of the wide-range pressure sensor (P1) is less than or equal to the input setting value of the high-precision pressure sensor (P2), it means that the bottom pressure of the charging and discharging water seal is gradually reduced and has entered the normal measurement range of the high-precision pressure sensor (P2). If the working condition is ready at this time, it should be judged that (P2) is enabled. After (P2) is enabled, the high-precision pressure sensor (P2) is enabled and self-maintained through the IN2 pin of the second logic module (03); S23. If the actual measured value of the wide-range pressure sensor (P1) is greater than or equal to the exit setting value of the high-precision pressure sensor (P2), it means that the bottom pressure of the charging and releasing water seal is gradually increasing, and then may gradually exceed the normal measurement range of the high-precision pressure sensor (P2). In this case, the high-precision pressure sensor (P2) should be judged to be enabled as false; at any time when the working conditions are not ready, the high-precision pressure sensor (P2) should be judged to be enabled as false.

6. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 5, characterized in that: The relationship between the upper pressure range of the high-precision pressure sensor (P2), the exit value of the high-precision pressure sensor (P2), and the input value of the high-precision pressure sensor (P2) is as shown in formula (1): The pressure measuring upper range of the high-precision pressure sensor (P2) ≥ the exit value of the high-precision pressure sensor (P2) ≥ the input value of the high-precision pressure sensor (P2).

7. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 4, characterized in that: In step S3, when the working conditions are ready and the high-precision pressure sensor (P2) is enabled and is false, after a stabilization time T1 delay, the measurement value of the wide-range pressure sensor (P1) is assigned to the measurement effective value (P0) of the bottom pressure of the charging and discharging water seal; The false enable of the high-precision pressure sensor (P2) indicates that the bottom pressure of the charging and releasing water seal is much greater than 0MPa. In this working condition, a wide-range pressure sensor (P1) should be selected as the bottom pressure measurement sensor of the charging and releasing water seal; the first delayed connection module (07) can avoid the (P1) measured pressure value fluctuation caused by the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02) returning to the measurement effective value (P0).

8. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 7, characterized in that: The parameter value of the stabilization time T1 used by the first delay connection module (07) should be determined according to the pressure fluctuation time caused by the reset of the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02), and a certain delay margin should be reserved.

9. A method for measuring the bottom pressure of a deep hole filling and releasing water seal of a hydropower station according to claim 4, characterized in that: In step S4, when the working conditions are ready and the high-precision pressure sensor (P2) is enabled, after a stabilization time T2 delay, the measured value of the high-precision pressure sensor (P2) is assigned to the measured effective value (P0) of the bottom pressure of the charging and discharging water seal; The high-precision pressure sensor (P2) is enabled to be true, indicating that the bottom pressure of the charging and releasing water seal is close to 0MPa. In this working condition, the high-precision pressure sensor (P2) should be selected as the bottom pressure measurement sensor of the charging and releasing water seal. The second delay connection module (10) can avoid the measured pressure value fluctuation caused by the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02) being output to the measurement effective value (P0).

10. A method for measuring the bottom pressure of a water seal of a flood discharge deep hole of a hydropower station according to claim 9, characterized in that: The parameter value of the stabilization time T2 used by the second delay connection module (10) should be determined based on the pressure fluctuation time caused by the action of the high-precision pressure sensor water filling solenoid valve (YV01) and the high-precision pressure sensor drainage solenoid valve (YV02), and a certain delay margin should be reserved, which can be determined based on on-site tests of the hydropower station.

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