CN214252986U

CN214252986U - Hydraulic turbine butterfly valve flat pressure signal device

Info

Publication number: CN214252986U
Application number: CN202120221710.2U
Authority: CN
Inventors: 田显斌; 白奎明; 柳钢; 钟永高; 翟保刚
Original assignee: Sichuan Huaneng Taipingyi Hydropower Co Ltd
Current assignee: Sichuan Huaneng Taipingyi Hydropower Co Ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-09-21
Anticipated expiration: 2031-01-27

Abstract

The utility model discloses a water turbine butterfly valve flat pressure signal device, which comprises a butterfly valve, wherein the upstream side of the butterfly valve and the downstream side of the butterfly valve are respectively and electrically connected with a programmable controller through a signal acquisition module, the programmable controller is in wired connection with a power module, the programmable controller is electrically connected with a relay, and the programmable controller is in interactive electric connection with a touch screen; the signal acquisition module comprises a first pressure measuring pipe, the first pressure measuring pipe is communicated with the upstream side, a first pressure transmitter is used for detecting the pressure in the first pressure measuring pipe, a second pressure measuring pipe is communicated with the downstream side, a second pressure transmitter is used for detecting the pressure in the second pressure measuring pipe, and the first pressure transmitter and the second pressure transmitter are electrically connected with the programmable controller. The utility model discloses use passive pressure transmitter as the signal acquisition component, assist PLC formula programmable controller, both improved the reliability of concora crush signal, solved the difficulty that concora crush constant value was set again.

Description

Hydraulic turbine butterfly valve flat pressure signal device

Technical Field

The utility model relates to a hydraulic turbine control technical field, in particular to hydraulic turbine butterfly valve concora crush signal device.

Background

The butterfly valve of the water turbine is opened in order to reduce vibration and operating force during opening and meet the requirement of stable starting of a unit, and must be opened in flat hydrostatic pressure. In order to represent the flat pressure of a butterfly valve, a mechanical differential pressure switch arranged on a butterfly valve body is adopted by a traditional water turbine flat pressure signal device as a flat pressure signal acquisition element, the measurement precision is low, the sensitivity is poor, the fixed value setting and the calibration are difficult, the mechanical differential pressure switch is influenced by a damp environment, is easy to corrode and is influenced by aperiodic hydraulic vibration, the set value is easy to change and mistakenly sends signals, the butterfly valve is rejected or mistakenly moved when opened, and the equipment can be damaged in serious cases to cause the occurrence of major accidents of flooding plants.

As shown in fig. 1, a conventional butterfly valve flat pressure signal device of a water turbine comprises a hydraulic circuit consisting of a first pressure measuring pipe 2, a second pressure measuring pipe 7 and a differential pressure switch 15; the contact 16, the relay 5 and the butterfly valve control cabinet 17 form an electric loop. When the pressure difference between the A, B chambers of the differential pressure switch 15 reaches a predetermined value, the contact 16 is closed, the electric circuit is turned on, the contact of the relay 4 is operated, the upstream side 12 and the downstream side 13 of the butterfly valve 1 are pressed flatly, and the upstream side 12 and the downstream side 13 are connected by a bypass valve 14 provided in parallel. The disadvantages are that: (1) because the flat voltage signal acquisition element is a mechanical differential switch, the measurement precision is low, the sensitivity is poor, and the fixed value setting and the calibration are difficult; (2) influenced by aperiodic hydraulic vibration, the setting value is easy to change to send signals by mistake, and the reliability is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a hydraulic turbine butterfly valve concora crush signal device.

The purpose of the utility model is realized through the following technical scheme:

a water turbine butterfly valve flat-pressing signal device comprises a butterfly valve, a signal acquisition module, a programmable controller, a touch screen, a power module and a relay, wherein the upstream side of the butterfly valve and the downstream side of the butterfly valve are respectively and electrically connected with the input end of the programmable controller through the signal acquisition module, the input end of the programmable controller is in wired connection with the power module, the output end of the programmable controller is electrically connected with the input end of the relay, and the programmable controller is in interactive electric connection with the touch screen;

the signal acquisition module comprises a first pressure measuring pipe, a second pressure measuring pipe, a first pressure transmitter and a second pressure transmitter, the first pressure measuring pipe is communicated with the upstream side, the first pressure transmitter is used for detecting the pressure in the first pressure measuring pipe, the second pressure measuring pipe is communicated with the downstream side, the second pressure transmitter is used for detecting the pressure in the second pressure measuring pipe, and the first pressure transmitter and the second pressure transmitter are electrically connected with the programmable controller.

Furthermore, the programmable controller comprises an analog input AI module, a signal processing module and a digital output DO module, the first pressure transmitter and the second pressure transmitter are electrically connected with an input end of the analog input AI module, an input end of the signal processing module is electrically connected with an output end of the analog input AI module, the signal processing module is electrically connected with the touch screen in an interactive mode, an input end of the digital output DO module is electrically connected with an output end of the signal processing module, an output end of the digital output DO module is electrically connected with an input end of the relay, and input ends of the analog input AI module, the signal processing module and the digital output DO module are respectively connected with the power module.

Furthermore, the analog input AI module is provided with a first channel and a second channel, the first pressure transmitter is electrically connected with the first channel, and the second pressure transmitter is electrically connected with the second channel.

Further, the programmable controller is a PLC type programmable controller.

Further, the relay is an extension relay.

Further, the signal processing module is a processor CPU.

Further, the lower voltage of the first channel and the lower voltage of the second channel are both 0V, and the upper voltage of the first channel and the upper voltage of the second channel are both 24V.

Further, the lower voltage of the extension relay is 0V, and the upper voltage of the extension relay is 24V.

Further, the first pressure transmitter and the second pressure transmitter are both passive pressure transmitters.

Furthermore, a bypass valve is arranged in parallel on the butterfly valve, one end of the bypass valve is communicated with the upstream side, and the other end of the bypass valve is communicated with the downstream side.

The utility model has the advantages that:

the utility model discloses use passive pressure transmitter to constitute PLC formula programmable controller jointly with analog input AI module, signal processing module and digital output DO module as the signal acquisition component, both improved the reliability of concora crush signal, solved the difficulty that concora crush constant value was set again.

Drawings

FIG. 1 is a prior art connection block diagram;

FIG. 2 is a view showing a connection structure of the present apparatus;

FIG. 3 is a control flow chart of the present apparatus;

in the figure, 1-butterfly valve, 2-first pressure measuring tube, 3-first pressure transmitter, 4-analog input AI module, 5-relay, 6-second pressure transmitter, 7-second pressure measuring tube, 8-touch screen, 9-signal processing module, 10-digital output DO module, 11-power module, 12-upstream side, 13-downstream side, 14-bypass valve, 15-differential pressure switch, 16-contact, 17-butterfly valve control cabinet, 18-first channel, 19-second channel.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 2-3, the present invention provides a technical solution:

a water turbine butterfly valve flat pressure signal device comprises a butterfly valve 1, a signal acquisition module, a programmable controller, a touch screen 8, a power module 11 and a relay 5, wherein an upstream side 12 of the butterfly valve 1 and a downstream side 13 of the butterfly valve 1 are respectively and electrically connected with an input end of the programmable controller through the signal acquisition module, an input end of the programmable controller is in wired connection with the power module 11, an output end of the programmable controller is electrically connected with an input end of the relay 5, and the programmable controller is in interactive electric connection with the touch screen 8; the signal acquisition module comprises a first pressure measuring pipe 2, a second pressure measuring pipe 7, a first pressure transmitter 3 and a second pressure transmitter 6, the first pressure measuring pipe 2 is communicated with an upstream side 12, the first pressure transmitter 3 is used for detecting the pressure in the first pressure measuring pipe 2, the second pressure measuring pipe 7 is communicated with a downstream side 13, the second pressure transmitter 6 is used for detecting the pressure in the second pressure measuring pipe 7, and the first pressure transmitter 3 and the second pressure transmitter 6 are both electrically connected with the programmable controller. The programmable controller is a PLC type programmable controller. The relay 5 is an extension relay. The first pressure transmitter 3 and the second pressure transmitter 6 are both passive pressure transmitters. Wherein, passive pressure transmitter and extension relay are prior art equipment. The lower voltage of the extension relay is 0V, and the upper voltage is 24V. Namely, the voltages applied to the extension relay are 0V and 24V, respectively. The utility model discloses use passive pressure transmitter to constitute PLC formula programmable controller jointly with analog input AI module, signal processing module and digital output DO module as the signal acquisition component, both improved the reliability of concora crush signal, solved the difficulty that concora crush constant value was set again. The power module 11 is used for providing device working power.

In some embodiments, the programmable controller includes an analog input AI module 4, a signal processing module 9, and a digital output DO module 10, the first pressure transmitter 3 and the second pressure transmitter 6 are electrically connected to an input terminal of the analog input AI module 4, an input terminal of the signal processing module 9 is electrically connected to an output terminal of the analog input AI module 4, the signal processing module 9 is electrically connected to the touch screen 8 in an interactive manner, an input terminal of the digital output DO module 10 is electrically connected to an output terminal of the signal processing module 9, an output terminal of the digital output DO module 10 is electrically connected to an input terminal of the relay 5, and input terminals of the analog input AI module 4, the signal processing module 9, and the digital output DO module 10 are respectively connected to the power supply module 11. The signal processing module 9 is a processor CPU. The processor CPU is a prior art component. The signal processing module 9 and the touch screen 8 form an interactive (HMI) module for a human dialog with the signal processing module.

In some embodiments, the analog input AI module 4 is provided with a first channel 18 and a second channel 19, the first pressure transmitter 3 being electrically connected to the first channel 18, the second pressure transmitter 6 being electrically connected to the second channel 19. The lower voltage of the first channel 18 and the second channel 19 is 0V, and the upper voltage thereof is 24V. I.e. the voltages applied across the first pressure transmitter 3 and the second pressure transmitter 6 are 0V and 24V, respectively.

In some embodiments, a bypass valve 14 is juxtaposed with the butterfly valve 1, and one end of the bypass valve 14 communicates with the upstream side 12 and the other end communicates with the downstream side 13.

In the device, analog quantity is input into a signal acquisition unit consisting of an AI module 4, a first pressure transmitter 3 and a second pressure transmitter 6; the analog quantity input AI module 4, the first pressure transmitter 3 and the second pressure transmitter 6 form a signal input unit; the signal processing module 9 is a processor CPU; a signal output unit consisting of a digital output DO module 10 and an extended relay; an interactive (HMI) unit consisting of a touch screen 8 and a processor CPU; the power supply unit is a power supply module 11. The signal acquisition unit is used for acquiring water pressure and converting the water pressure (physical quantity) into an electric signal; the signal input unit is used for transmitting and receiving the electric signal of the acquisition unit, and the electric signal is transmitted to the signal processing unit through a data bus after being subjected to analog/digital (A/D) conversion; the signal processing unit is used for calculating and comparing the input signals; the output unit receives the result of the signal processing unit and outputs a flat voltage signal; an interactive (HMI) unit for human dialog with the signal processing unit; the power supply unit is used for providing working power supply for the device.

After the above technical scheme is adopted in the utility model, can solve the shortcoming of the existing hydraulic turbine butterfly valve concora crush signal device, can effectively protect equipment and improve the even start of unit. The working principle of the method is explained in detail in conjunction with fig. 2 as follows: the first pressure measuring pipe 2 leads the water pressure of the upstream side 12 of the butterfly valve 1 into a first pressure transmitter 3 arranged on the first pressure measuring pipe 2, the water pressure (physical quantity) of the upstream side 12 is converted into an analog quantity of 4-20mA through the first pressure transmitter 3, and then the analog quantity is sent into a first channel 18 of the analog quantity input AI module 4 through a secondary cable with a shielding layer. The bypass valve 14 is opened, the second pressure measuring pipe 7 introduces the water pressure at the downstream side 13 of the butterfly valve 1 into the second pressure transmitter 6 arranged on the second pressure measuring pipe 7, the water pressure (physical quantity) at the downstream side is converted into the analog quantity of 4-20mA through the second pressure transmitter 6, and then the analog quantity is sent into the second channel 19 of the analog quantity input AI module 4 through the secondary cable with the shielding layer. The analog input AI module 4 respectively carries out analog/digital (A/D) conversion on the analog quantity of the first channel 18 and the second channel 19 into high-precision digital quantity, the high-precision digital quantity is transmitted to the processor CPU by a data bus, the processor CPU carries out optimization processing and operation such as filtering, validity judgment, engineering quantity conversion, range calibration and the like on the digital quantity, difference comparison is carried out on the operation results of the two channels, when the difference is smaller than a flat pressure threshold value, the digital output DO module output channel is enabled after delay filtering, the extension relay 5 acts to send out a flat pressure signal, and the signals are respectively transmitted to the butterfly valve 1 control loop and the computer monitoring system.

The touch screen 8 exchanges information with the CPU in a communication mode, on one hand, information such as water pressure, sampling value faults and the like on the upper side and the downstream side of the butterfly valve 1 processed by the CPU is displayed, monitoring is facilitated, on the other hand, according to actual needs, a flat pressure threshold value is checked and modified, and normal work of the butterfly valve is guaranteed.

The power module 11 can provide power for the normal operation of the device, and can support both AC220V and DC220V, which is flexible and convenient.

As shown in the attached figure 3, the method for processing the butterfly valve flat pressure signal of the water turbine comprises the following steps:

step 1: the upstream side 12 water pressure P1 and the downstream side 13 water pressure P2 of the butterfly valve 1 are subjected to filtering, engineering quantity conversion, range calibration processing and logic operation.

Step 2: according to the range calibration, the rationality of the P1 and P2 data is judged, and if any one of the data is unreasonable, the following steps are carried out: and exiting the process.

And 3, step 3: if the data of P1 and P2 are reasonable, P1-P2 are less than the threshold value, an intermediate flat voltage signal is generated, otherwise: and returning to the step 1.

And 4, step 4: in order to prevent signal interference, filtering the generated middle flat pressing signal for delaying t seconds;

and 5, step 5: and outputting final flat pressure signals, and respectively sending the signals to a butterfly valve 1 control loop and a computer monitoring system through an expansion relay 5.

The foregoing is illustrative of the preferred embodiments of the present invention, and it is to be understood that the invention is not limited to the precise forms disclosed herein, and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the invention as defined by the appended claims. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a hydraulic turbine butterfly valve concora crush signal device which characterized in that: the butterfly valve comprises a butterfly valve (1), a signal acquisition module, a programmable controller, a touch screen (8), a power module (11) and a relay (5), wherein an upstream side (12) of the butterfly valve (1) and a downstream side (13) of the butterfly valve (1) are respectively electrically connected with an input end of the programmable controller through the signal acquisition module, an input end of the programmable controller is in wired connection with the power module (11), an output end of the programmable controller is electrically connected with an input end of the relay (5), and the programmable controller is in interactive electrical connection with the touch screen (8);

the signal acquisition module comprises a first pressure measuring pipe (2), a second pressure measuring pipe (7), a first pressure transmitter (3) and a second pressure transmitter (6), the first pressure measuring pipe (2) is communicated with the upstream side (12), the first pressure transmitter (3) is used for detecting the pressure in the first pressure measuring pipe (2), the second pressure measuring pipe (7) is communicated with the downstream side (13), the second pressure transmitter (6) is used for detecting the pressure in the second pressure measuring pipe (7), and the first pressure transmitter (3) and the second pressure transmitter (6) are electrically connected with the programmable controller.

2. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 1, wherein: the programmable controller comprises an analog quantity input AI module (4), a signal processing module (9) and a digital quantity output DO module (10), the first pressure transmitter (3) and the second pressure transmitter (6) are both electrically connected with the input end of the analog input AI module (4), the input end of the signal processing module (9) is electrically connected with the output end of the analog quantity input AI module (4), the signal processing module (9) is interactively and electrically connected with the touch screen (8), the input end of the digital quantity output DO module (10) is electrically connected with the output end of the signal processing module (9), the output end of the digital quantity output DO module (10) is electrically connected with the input end of the relay (5), the input ends of the analog input AI module (4), the signal processing module (9) and the digital output DO module (10) are respectively connected with the power supply module (11).

3. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 2, wherein: the analog input AI module (4) is provided with a first channel (18) and a second channel (19), the first pressure transmitter (3) is electrically connected with the first channel (18), and the second pressure transmitter (6) is electrically connected with the second channel (19).

4. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 1, 2 or 3, wherein: the programmable controller is a PLC type programmable controller.

5. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 1, wherein: the relay (5) is an extension relay.

6. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 2, wherein: the signal processing module (9) is a CPU.

7. The signal device of claim 3 for the flat pressure of a butterfly valve of a water turbine, comprising: the lower voltage of the first channel (18) and the lower voltage of the second channel (19) are both 0V, and the upper voltage of the first channel and the upper voltage of the second channel are both 24V.

8. The signal device of claim 5 for the flat pressure of a butterfly valve of a water turbine, comprising: the lower voltage of the extension relay is 0V, and the upper voltage of the extension relay is 24V.

9. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 2, wherein: the first pressure transmitter (3) and the second pressure transmitter (6) are both passive pressure transmitters.

10. The signal device for the flat pressure of the butterfly valve of the water turbine as claimed in claim 1, wherein: the butterfly valve (1) is provided with bypass valves (14) in parallel, one ends of the bypass valves (14) are communicated with the upstream side (12), and the other ends of the bypass valves (14) are communicated with the downstream side (13).