CN111578146B - Negative pressure pipe network monitoring station of negative pressure conveying system and water column plug eliminating method - Google Patents
Negative pressure pipe network monitoring station of negative pressure conveying system and water column plug eliminating method Download PDFInfo
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- CN111578146B CN111578146B CN202010455133.3A CN202010455133A CN111578146B CN 111578146 B CN111578146 B CN 111578146B CN 202010455133 A CN202010455133 A CN 202010455133A CN 111578146 B CN111578146 B CN 111578146B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/005—Pipe-line systems for a two-phase gas-liquid flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
The invention relates to a negative pressure pipe network monitoring station of a negative pressure conveying system and a water column plug eliminating method. The negative pressure pipe network monitoring station comprises a gas distribution pipe for connecting a negative pressure conveying pipeline, a self-control gas distribution interface of the gas distribution pipe is connected with a first end of a self-control gas distribution valve, the self-control gas distribution valve is a negative pressure control valve, a control gas path interface of the self-control gas distribution valve is connected with a negative pressure source or atmosphere through a two-position three-way valve, and the two-position three-way valve controls the state of the two-position three-way valve according to the negative pressure condition in the gas distribution pipe so as to control the work of the negative pressure valve. The water column plug eliminating method is that when the negative pressure value inside the air distributing pipe is lower than certain value, the automatic control air distributing valve is controlled to open automatically for certain time to distribute air. The air distribution device can be connected to the tail end of a pipeline of a negative pressure system or other positions, and a water plunger can be automatically eliminated.
Description
Technical Field
The invention relates to a negative pressure pipe network monitoring station of a negative pressure conveying system and a water column plug eliminating method, which are mainly used for a negative pressure conveying system.
Background
When a main pipeline of the negative pressure transmission system is long, or a peak flow rate is prominent, or a large climbing section exists, a continuous full pipe section, namely a water column plug, is formed in the pipeline due to high water volume concentrated discharge or high lifting requirement, so that an air passage in the pipeline is blocked, air flow is not smooth, negative pressure cannot be transmitted, and the negative pressure strength at the rear end (particularly the tail end) can drop below a certain value (such as minus 0.3 kg), so that negative pressure transmission is influenced.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a negative pressure pipe network monitoring station and a water column plug eliminating method for a negative pressure conveying system, which are advantageous for eliminating the water column plug phenomenon.
The technical scheme of the invention is as follows: the negative pressure pipe network monitoring station of the negative pressure conveying system comprises a gas distribution pipe used for being connected into a negative pressure conveying pipeline, wherein a self-control gas distribution interface is arranged on the gas distribution pipe and connected with a first end of a self-control gas distribution valve, and a second end of the self-control gas distribution valve is communicated with atmosphere or a gas distribution gas source.
Preferably, the self-control air distribution valve is a negative pressure control valve and is provided with a control air path interface, the control air path interface is connected with an outlet of a two-position three-way valve, a first inlet of the two-position three-way valve is connected with a first control air source, a second inlet of the two-position three-way valve is communicated with the atmosphere or a second control air source, the first control air source is a negative pressure source capable of controlling the opening of the negative pressure control valve, and the second control air source is a positive pressure source capable of controlling the closing of the negative pressure valve.
Preferably, a first pressure sensor for detecting the pressure in the pipe of the gas distribution pipe is provided, and the sensing signal output of the first pressure sensor is used for connecting a control device capable of controlling the two-position three-way valve.
The first pressure sensor may be a first pressure switch.
Preferably, the negative pressure source is provided with a negative pressure cavity, the negative pressure cavity is provided with a first inlet, the first inlet is connected with a first negative pressure connecting pipe used for connecting a negative pressure conveying pipeline, and the first negative pressure connecting pipe is provided with a first one-way valve which only allows airflow to flow from the side of the negative pressure cavity to the side of the negative pressure conveying pipeline.
Preferably, the negative pressure cavity is provided with a second inlet, the second inlet is connected with the air suction port of the negative pressure pump through a second negative pressure connecting pipe, and the second negative pressure connecting pipe is provided with a second one-way valve which only allows air flow to flow from the negative pressure cavity side to the negative pressure pump side.
Preferably, a second pressure sensor is provided for detecting the pressure in the negative pressure cavity, and the sensing signal output of the second pressure sensor is used for accessing a negative pressure pump control device for controlling the negative pressure pump.
The second pressure sensor may be a second pressure switch.
A manual gas distribution valve may be provided, the second end of the manual control valve being in communication with the atmosphere or a gas distribution source.
The gas distribution pipe can be provided with a manual gas distribution interface, and the first end of the manual gas distribution valve is connected with the manual gas distribution interface on the gas distribution pipe.
The gas distribution pipe can be also not provided with a manual gas distribution interface, and the first end of the manual gas distribution valve is used for connecting a negative pressure conveying pipeline.
The gas distribution pipe can adopt a manifold form, a main pipe interface of the gas distribution pipe is used for connecting a negative pressure conveying pipeline, and branch pipe interfaces respectively form a self-control gas distribution interface and a manual gas distribution interface which are respectively used for connecting a self-control gas distribution valve and a manual gas distribution valve.
The method for eliminating the water plug of the negative pressure conveying system is provided with a negative pressure pipe network monitoring station, the negative pressure pipe network monitoring station can adopt any negative pressure pipe network monitoring station of the negative pressure conveying system, for example, the negative pressure pipe network monitoring station comprises a gas distribution pipe connected into a negative pressure conveying pipeline, the gas distribution pipe is provided with a self-control gas distribution interface, the self-control gas distribution interface is connected with a first end of a self-control gas distribution valve, a second end of the self-control gas distribution valve is communicated with the atmosphere or a gas distribution gas source, and when the negative pressure value (absolute value) in the gas distribution pipe is lower than or not higher than a set lower limit value (namely the relative pressure is higher than or not lower than a corresponding upper limit value), the self-control gas distribution valve is opened for a certain time and then closed so as to eliminate the water plug of the negative pressure conveying pipeline between the gas distribution pipe connection point and the negative pressure station.
Preferably, the maximum number of times of opening the automatic control negative pressure valve for automatic air distribution within a certain time (time interval) is set, within the set maximum number of times, if the negative pressure value in the air distribution pipe after the automatic control air distribution valve is closed is still lower than or not greater than the set lower limit value, the automatic control air distribution valve is controlled to be opened again for a certain time and then closed, and after the set maximum number of times is reached, if the negative pressure value in the air distribution pipe after the automatic control air distribution valve is closed is still lower than or not greater than the set lower limit value, an alarm is given for manual treatment.
The negative pressure valve can be used as an automatic control gas distribution valve, a control gas path interface of the negative pressure control valve is connected with an outlet of a two-position three-way valve, a first inlet of the two-position three-way valve is connected with a first control gas source, a second inlet of the two-position three-way valve is communicated with atmosphere or a second control gas source, the first control gas source is a negative pressure source capable of controlling the opening of the negative pressure control valve, the second control gas source is a positive pressure (containing zero pressure or no pressure) source capable of controlling the closing of the negative pressure valve, a first pressure sensor is used for detecting the pressure in a gas distribution pipe, a sensing signal output of the first pressure sensor is connected into a control device capable of controlling the state of the two-position three-way valve, so that the action control of the negative pressure valve is carried out, the control device controls the opening of the negative pressure valve to switch the two-position three-way valve to a state that the outlet is communicated with the first inlet, and the control device controls the closing of the negative pressure valve to switch to a state that the outlet is communicated with the second inlet, because the first pressure sensor collects the pressure signal in the air distribution pipe, the sensing signal output can be used for representing the negative pressure value in the air distribution pipe.
The working process and the beneficial effects of the invention are as follows: the negative pressure monitoring station is arranged, the air distribution device is matched with a corresponding monitoring module (control device) for use, a first pressure switch (which can also adopt other types of pressure sensors) used as a first pressure sensor is used for obtaining a pressure signal of a negative pressure conveying pipeline at a detection point, the switching state (which can be normally open or normally closed) of the pressure switch is determined by the pressure of the detection point, when the negative pressure value in the air distribution pipe is reduced to a certain degree (namely the absolute pressure is increased to a certain value), the pressure switch switches the on-off state, the switching signal is used as the control basis of the monitoring device to control the action of the two-position three-way valve, a control air passage interface of the negative pressure control valve is communicated with a negative pressure source for control, the negative pressure control valve is opened, the negative pressure pipeline is communicated with the atmosphere at an access point of the air distribution pipe, the pressure of the access point is increased, and a water plunger positioned in front is pushed by increased pressure (front-back pressure difference), and the water column plug disappears after the water flows forwards into the negative pressure station.
The monitoring module can determine the time for opening the negative pressure control valve once according to a set value so as to avoid excessive consumption of negative pressure due to the fact that a detection point is communicated with the atmosphere for a long time, if the water plunger does not disappear, after the negative pressure control valve is disconnected, the pressure switch still detects that the negative pressure is insufficient and is still in a switch state of insufficient negative pressure, and the negative pressure control valve can be started again to distribute air (the air is communicated with the atmosphere through the air distribution pipe). The maximum number of times (for example, 3 times) of repeated air distribution in a short time can be controlled through the setting of software or hardware, if the negative pressure of a detection point is still not recovered after the air distribution for many times, the air distribution mode cannot eliminate a water plunger, the air distribution action is not carried out any more, and the fault alarm can be carried out through the control device so as to adopt other treatment to search specific faults or reasons, for example, a pipeline is damaged.
The invention can automatically detect the negative pressure state of a detection point (which can be usually arranged at the tail end region of a negative pressure pipeline) under the matching of a corresponding control device, automatically distribute air under the condition of insufficient negative pressure, and can effectively eliminate the water plunger phenomenon under the conditions that the negative pressure system is reasonably designed and other faults do not exist, thereby not only being convenient and timely, but also saving labor, and having less consumed power and other costs.
Drawings
FIG. 1 is a schematic of a product configuration of the present invention;
FIG. 2 is a schematic view of a negative pressure source;
FIG. 3 is a schematic view of the relevant parts of the gas distribution system in one embodiment, with the connection hoses and the like not shown for clarity;
fig. 4 is a side view corresponding to fig. 3.
Detailed Description
Referring to fig. 1-4, the negative pressure pipe network monitoring station includes a gas distribution pipe 20 for connecting to a negative pressure conveying pipe (or called negative pressure pipe or negative pressure pipeline, etc.) 10, the connection point may be generally located at or near an end 19 of the end of the negative pressure conveying pipe, the gas distribution pipe is provided with a self-control gas distribution interface, the self-control gas distribution interface is connected to a first end of a self-control gas distribution valve, and a second end of the self-control gas distribution valve is communicated with the atmosphere or a gas distribution source.
The distribution gas source is usually zero pressure, and can also be positive pressure according to actual conditions and requirements.
The automatic control air distribution valve is opened to communicate the negative pressure conveying pipeline with the atmosphere, the pressure of the air distribution pipe connecting part is increased, the pressure difference between the connecting part and the negative pressure station is also increased, and when a water plunger piston appears between the connecting part and the negative pressure station, the driving force of the water plunger piston can be increased, so that the water plunger piston is eliminated.
The automatic control gas distribution valve is a negative pressure control valve (or called negative pressure valve) 22 and is provided with a control gas path interface (control end interface), the control gas path interface is connected with an outlet of a two-position three-way valve 40 through a control connection gas path 31, a first inlet of the two-position three-way valve is connected with a first control gas source 50 through a negative pressure connecting pipeline 45, a second inlet is communicated with atmosphere or a second control gas source through an atmosphere communicating pipe 43 and can be directly opened in an atmosphere space, the first control gas source is a negative pressure source capable of controlling the opening of the negative pressure control valve, and the second control gas source is a positive pressure source capable of controlling the closing of the negative pressure valve. Therefore, the pressure of the control gas path interface of the negative pressure control valve can be controlled by controlling the working state of the two-position three-way valve, and the working state of the negative pressure control valve is further controlled.
Usually, the second control air source is a zero pressure source, a slight negative pressure source or a slight positive pressure source, and can be set according to the field condition and the control requirement of the negative pressure control valve.
A first pressure sensor 32 is provided for detecting the pressure in the pipe of the gas distribution pipe, the sensing signal output of the first pressure sensor is used for accessing the control device 30 capable of controlling the two-position three-way valve, and a corresponding cable 33 can be used for wired transmission. The control device may be a system control device (wireless remote monitoring module, or called monitoring module) of the product, and is provided with a wired and/or wireless communication module capable of communicating with the remote control center 38, so as to receive a control instruction or control parameter setting of the remote control center, and send status information and other information to the remote control center, thereby realizing remote control.
The control device controls the state of the two-position three-way valve according to the sensing signal of the first pressure sensor, and can perform wired transmission of the control signal through a corresponding cable 37 and output the control signal to be connected to the control end of the two-position three-way valve. When the transmitted sensing signal is that the pressure in the gas distribution pipe is reduced to or below a certain value, the outlet of the two-position three-way valve is controlled to be communicated with the first inlet, corresponding negative pressure is formed at the control gas path interface of the negative pressure control valve, the negative pressure control valve is opened, the negative pressure conveying pipeline is connected with the atmospheric pressure through the gas distribution pipe, after a set time, the state of the two-position three-way valve is automatically switched to be communicated with the outlet and the second inlet, corresponding positive pressure (zero pressure) is formed at the control gas path interface of the negative pressure control valve, the negative pressure control valve is closed, if the sensing signal of the first pressure sensor rapidly indicates that the pressure in the gas distribution pipe is lower than the certain value, the control device controls the negative pressure control valve to be opened again, when the repeated opening times reach the set times (for example, three times), enough negative pressure still can not be formed in the gas distribution pipe, and the control device does not control the negative pressure control valve to be opened any more, but rather an alarm signal.
The first pressure sensor is a first pressure switch.
The switch state of the first pressure switch is controlled by the size of the accessed negative pressure, and a switch signal is output.
The negative pressure source is provided with a negative pressure cavity 51, the negative pressure cavity is provided with a first inlet, the first inlet is connected with a first negative pressure connecting pipe 52 used for connecting a negative pressure conveying pipeline, and the first negative pressure connecting pipe is provided with a first one-way valve 53 which only allows airflow to flow from the side of the negative pressure cavity to the side of the negative pressure conveying pipeline.
The negative pressure cavity is provided with a second inlet, the second inlet is connected with the air suction port of the negative pressure pump 60 through a second negative pressure connecting pipe 56, and the second negative pressure connecting pipe is provided with a second one-way valve 57 which only allows air flow to flow from the negative pressure cavity side to the negative pressure pump side.
A second pressure sensor 64 for detecting the pressure in the negative pressure cavity is provided, the sensing signal output of the second pressure sensor is used for accessing a negative pressure pump control device for controlling the negative pressure pump 60 through a corresponding cable (or pipeline) 65, and the negative pressure of the negative pressure cavity can be accessed to the second pressure sensor by communicating the negative pressure cavity with the corresponding interface of the second pressure sensor through a corresponding pipeline 63.
The negative pressure pump control device is used for controlling the work of the negative pressure pump, can be integrated on the negative pressure pump, can also be independently arranged or is adopted for controlling the negative pressure pump, under the condition that the negative pressure in the negative pressure conveying pipeline is normal, the required negative pressure can be formed in the negative pressure cavity, when the negative pressure value of the negative pressure conveying pipeline is reduced and lasts for a certain time, the negative pressure value in the negative pressure cavity can be reduced to the extent that the requirement of the negative pressure control valve can not be effectively controlled, the negative pressure pump control device controls the negative pressure pump to be started according to the sensing signal of the second pressure sensor, when the negative pressure value in the negative pressure cavity is reduced to a certain extent, the negative pressure pump is vacuumized (the gas in the negative pressure cavity is extracted) until the sensing signal of the second pressure sensor indicates that the negative pressure value in the negative pressure cavity is restored to the required extent. The mode of mainly maintaining the negative pressure in the negative pressure cavity by taking the negative pressure of the negative pressure conveying pipeline as a main part and taking the negative pressure pump as an auxiliary part maintains the negative pressure in the negative pressure cavity, so that the negative pressure in the negative pressure cavity is effectively maintained, and the capacity consumption can be reduced as much as possible.
The second pressure sensor is a second pressure switch, is controlled by the size of the accessed negative pressure and outputs a switch signal.
A manual air distribution valve 24 may also be provided, the second end of the manual control valve is communicated with the atmosphere or an air distribution source, a manual air distribution interface is provided on the air distribution pipe, the first end of the manual air distribution valve is connected with the manual air distribution interface on the air distribution pipe, or a manual air distribution interface is not provided on the air distribution pipe, and the first end of the manual air distribution valve is used for connecting a negative pressure conveying pipeline.
The gas distribution pipe can adopt a manifold form, a main pipe interface of the gas distribution pipe is used for connecting a negative pressure conveying pipeline, and branch pipe interfaces respectively form a self-control gas distribution interface and a manual gas distribution interface which are respectively used for connecting a self-control gas distribution valve and a manual gas distribution valve.
Each element/device can be installed in a box 90 to form a remotely controllable gas distribution box, a vertical face back plate 99 for installing the corresponding element and device is arranged in the box, the vertical face back plate is positioned at the rear part in the box, a door can be arranged in front of the box, a pipeline interface for connecting with an external pipeline (such as a negative pressure conveying pipeline) is arranged in the box, a through hole is arranged on the side wall of the box for connecting with the external pipeline, and the pipeline interface can also be directly arranged on the side wall of the box. To facilitate field assembly and maintenance.
The negative pressure pump is a miniature negative pressure pump and adopts a solar power supply device to supply power.
The solar power supply device is generally provided with a solar panel 70 and a solar storage battery 74 according to the prior art, and the solar storage battery is used as a power supply of the miniature negative pressure pump.
The solar panels may be positioned on top of the cabinet by respective brackets 79.
Usually, set up this product at negative pressure conveying line's end, also can set up other pipeline region's that easily appear water plunger the negative pressure station side of keeping away from to insert the atmosphere on water plunger's the negative pressure station side pipeline of keeping away from when appearing water plunger in negative pressure conveying line, increase the pressure differential of water column stopper both sides, and then the liquid that impels water plunger flows to the negative pressure station direction, eliminates water plunger.
A manual switching valve 29 may be provided on the side of the distribution pipe near the negative pressure delivery pipe, or the connection of the distribution pipe to the negative pressure delivery pipe may be performed through the manual switching valve, so that the manual switching valve is closed when necessary (e.g., maintenance of the distribution box).
The terms inlet and outlet are used herein only to avoid confusion and do not represent the actual flow of the gas stream, which typically corresponds to the direction of pressure (or signal) transmission, and may be opposite to the direction of gas flow in the case of negative pressure.
The technical means disclosed by the invention can be combined arbitrarily to form a plurality of different technical schemes except for special description and the further limitation that one technical means is another technical means.
Claims (6)
1. The negative pressure pipe network monitoring station of the negative pressure conveying system is used for eliminating a water plunger, and is characterized by comprising a gas distribution pipe for connecting a negative pressure conveying pipeline, wherein a self-control gas distribution interface is arranged on the gas distribution pipe and is connected with a first end of the self-control gas distribution valve, a second end of the self-control gas distribution valve is communicated with atmosphere or a gas distribution gas source, the self-control gas distribution valve is a negative pressure control valve and is provided with a control gas circuit interface, the control gas circuit interface is connected with an outlet of a two-position three-way valve, a first inlet of the two-position three-way valve is connected with a first control gas source, a second inlet of the two-position three-way valve is communicated with atmosphere or a second control gas source, the first control gas source is a negative pressure source capable of controlling the opening of the negative pressure control valve, the negative pressure source is provided with a negative pressure cavity, the negative pressure cavity is provided with a first inlet, the first inlet of the negative pressure cavity is connected with a first negative pressure connecting pipe for connecting the negative pressure conveying pipeline, the negative pressure chamber is equipped with the second import, the second import in negative pressure chamber is through the extraction opening that second negative pressure connecting pipe connects the negative pressure pump, is equipped with the first pressure sensor who is used for detecting the intraductal pressure of distribution pipe, first pressure sensor's sensing signal output is used for inserting can right the controlling means that two-position three-way valve carries out control, be equipped with on the first negative pressure connecting pipe and only allow the air current to flow to the first check valve of negative pressure delivery pipeline side from the negative pressure chamber side, be equipped with on the second negative pressure connecting pipe and only allow the air current to flow to the second check valve of negative pressure pump side from the negative pressure chamber side, be equipped with the second pressure sensor who is used for detecting negative pressure intracavity pressure, second pressure sensor's sensing signal output is used for inserting and is used for controlling the negative pressure pump controlling means of negative pressure pump.
2. The negative pressure pipeline network monitoring station of claim 1, wherein the second controlled air source is a positive pressure source capable of controlling the negative pressure control valve to close.
3. The negative pressure pipeline network monitoring station of claim 1 or 2, wherein the first pressure sensor is a first pressure switch.
4. The negative pressure pipeline network monitoring station of claim 1 or 2, wherein the second pressure sensor is a second pressure switch.
5. A method for eliminating a water plug of a negative pressure conveying system is provided with the negative pressure pipe network monitoring station as claimed in claim 1, wherein the negative pressure pipe network monitoring station comprises a gas distribution pipe connected with a negative pressure conveying pipeline, a self-control gas distribution interface is arranged on the gas distribution pipe and connected with a first end of a self-control gas distribution valve, a second end of the self-control gas distribution valve is communicated with the atmosphere or a gas distribution source, and when the negative pressure value in the gas distribution pipe is lower than or equal to a set lower limit value, the self-control gas distribution valve is opened for a certain time and then closed so as to eliminate the water plug of the negative pressure conveying pipeline between the gas distribution pipe connection point and the negative pressure station.
6. The method for removing a plug of a water column according to claim 5, wherein the maximum number of times of opening the automatic air distribution valve within a certain time for automatic air distribution is set, and within the set maximum number of times, if the value of the negative pressure in the air distribution pipe after the automatic air distribution valve is closed is still lower than or equal to the set lower limit value, the automatic air distribution valve is controlled to be opened again for a certain time and then closed, and after the set maximum number of times is reached, if the value of the negative pressure in the air distribution pipe after the automatic air distribution valve is closed is still lower than or equal to the set lower limit value, an alarm is given for manual handling.
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| CN202010455133.3A CN111578146B (en) | 2020-05-26 | 2020-05-26 | Negative pressure pipe network monitoring station of negative pressure conveying system and water column plug eliminating method |
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