CN113187030A - Gravity type constant pressure water supply method - Google Patents
Gravity type constant pressure water supply method Download PDFInfo
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- CN113187030A CN113187030A CN202110556788.4A CN202110556788A CN113187030A CN 113187030 A CN113187030 A CN 113187030A CN 202110556788 A CN202110556788 A CN 202110556788A CN 113187030 A CN113187030 A CN 113187030A
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- level control
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 230000005484 gravity Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/02—Arrangements or adaptations of tanks for water supply for domestic or like local water supply
- E03B11/06—Arrangements or adaptations of tanks for water supply for domestic or like local water supply with air regulators
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/08—Arrangement of draining devices, e.g. manual shut-off valves
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Structural Engineering (AREA)
- Control Of Fluid Pressure (AREA)
- Domestic Plumbing Installations (AREA)
Abstract
The invention provides a gravity type constant-pressure water supply method, which comprises the following steps of S1, arranging a low-level control valve at the low point of a main pipeline of factory water, and automatically controlling the opening degree of the valve by the low-level control valve according to the pressure requirement; s2, respectively arranging pressure transmitters in front of and behind the low-level control valve, wherein the pressure transmitter before the valve is used for monitoring the water head between a water plant and the low-level control valve, the data of the pressure transmitter after the valve is used as an adjusting value of constant-pressure water supply, and the target pressure of the system is set according to the adjusting value; and S3, dividing the system target pressure into a high-pressure section and a low-pressure section according to the urban water supply pressure requirement, wherein the low-pressure section is used for meeting the pressure regulation requirement of the urban low water supply pressure time interval, and the high-pressure section is used for meeting the pressure regulation requirements of the urban water supply pressure time interval and the high water supply pressure time interval. The automatic constant pressure of gravity type water supply is realized, the running stability of an automatic regulating system is further improved, and the urban water supply work is practically guaranteed.
Description
Technical Field
The invention relates to the field of water supply and drainage tap water, in particular to a gravity type constant-pressure water supply method.
Background
In city running water supply, gravity type water supply is often used, and stepped water supply is carried out from a reservoir to a water plant and then to an urban area through the action of gravity. The problems in actual production are that the pressure fluctuation range is large, the control accuracy is low, the algorithm is complex and the maintenance difficulty is large. The main water pipeline of the factory water is laid along the mountain body steeply, the water head drop of the gravity falling of the factory water is large, the water hammer impact of the inner wall of the main pipeline section is caused to a certain extent, and the service life of the pipeline is greatly influenced. Pressure transmitter sets up in the low height above sea level position of trunk line, and the response time of pressure variation is longer, can't realize closed-loop control, has caused the increase of pressure fluctuation scope, has certain potential safety hazard in the control of high pressure section.
Disclosure of Invention
In view of the above, the present invention provides a gravity type constant pressure water supply method, which realizes automatic constant pressure of gravity type water supply, further improves the operation stability of an automatic regulating system, and practically ensures urban water supply.
The invention solves the technical problems by the following technical means: the invention provides a gravity type constant pressure water supply method, which comprises the following steps,
s1, arranging a low-level control valve at a low point of a main delivery water pipeline, wherein the low-level control valve automatically controls the opening degree of the valve according to pressure requirements;
s2, respectively arranging pressure transmitters in front of and behind the low-level control valve, wherein the pressure transmitter before the valve is used for monitoring the water head between a water plant and the low-level control valve, the data of the pressure transmitter after the valve is used as an adjusting value of constant-pressure water supply, and the target pressure of the system is set according to the adjusting value;
and S3, dividing the system target pressure into a high-pressure section and a low-pressure section according to the urban water supply pressure requirement, wherein the low-pressure section is used for meeting the pressure regulation requirement of the urban low water supply pressure time interval, and the high-pressure section is used for meeting the pressure regulation requirements of the urban water supply pressure time interval and the high water supply pressure time interval.
Further, in step S1, the low point is an average altitude position of the urban water supply point.
Further, when the value of the post-valve pressure of the low-level control valve is larger than the target pressure of the system, the control system outputs a current signal through a program, pressure jitter is eliminated by taking the first time as delay every time, and the opening of the valve is decreased progressively; and when the value of the pressure after the valve is smaller than the target pressure of the system, the system controls the opening of the valve to increase progressively until the pressure after the valve reaches the target pressure of the system.
Further, the system target pressure of the high-pressure section is set to 0.4MPa, and the system target pressure of the low-pressure section is set to 0.5 MPa.
Further, the low-level control valve is a piston type flow regulating valve.
Further, in the step S3, the low water supply pressure time period is 1: 30-5: 30; the high water supply pressure time period is 6: 30-9: 00 and 17: 30-23: 00, and the rest time periods are medium water supply pressure time periods.
According to the technical scheme, the invention has the beneficial effects that: the invention provides a gravity type constant-pressure water supply method, which comprises the following steps of S1, arranging a low-level control valve at the low point of a main pipeline of factory water, and automatically controlling the opening degree of the valve by the low-level control valve according to the pressure requirement; s2, respectively arranging pressure transmitters in front of and behind the low-level control valve, wherein the pressure transmitter before the valve is used for monitoring the water head between a water plant and the low-level control valve, the data of the pressure transmitter after the valve is used as an adjusting value of constant-pressure water supply, and the target pressure of the system is set according to the adjusting value; and S3, dividing the system target pressure into a high-pressure section and a low-pressure section according to the urban water supply pressure requirement, wherein the low-pressure section is used for meeting the pressure regulation requirement of the urban low water supply pressure time interval, and the high-pressure section is used for meeting the pressure regulation requirements of the urban water supply pressure time interval and the high water supply pressure time interval. The automatic constant pressure of gravity type water supply is realized, the running stability of an automatic regulating system is further improved, and the urban water supply work is practically guaranteed.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a valve layout diagram of a gravity type constant pressure water supply method provided by the present invention;
FIG. 2 is a view illustrating the actual operation of the gravity type constant pressure water supply method according to the present invention;
FIG. 3 is a water supply flow history curve diagram of the gravity type constant pressure water supply method according to the present invention;
FIG. 4 is a global pressure-controlling history graph of the gravity type constant-pressure water supply method according to the present invention;
FIG. 5 is a diagram showing the relationship between the gravity type constant pressure water supply method and the water supply point elevation;
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1, the present invention provides a gravity type constant pressure water supply method, comprising,
s1, arranging a low-level control valve at a low point of a main delivery water pipeline, wherein the low-level control valve automatically controls the opening degree of the valve according to pressure requirements; the low point is the average altitude position of the urban water supply point. For example, the elevation of a clean water tank of a certain waterworks is 506.62m, the main water distribution pipe of factory water is obliquely laid along a mountain, a low-level flow control valve is additionally arranged at the average elevation position of an urban area at the elevation of the main water distribution pipe 428.82m, and the opening degree of the valve is automatically controlled according to the pressure requirement. Meanwhile, the water valve leaving the factory is used as a safe standby valve, is used as a standby means for safe emergency control under emergency conditions, and is used for emergency closing under the special conditions of power failure or system faults, so that the pressure of a pipe network is protected from being impacted. In general, the factory water valve is set to be fully opened.
The low-level control valve is used as an actual constant-pressure control valve, and the opening degree is automatically adjusted through a program and is generally smaller than a factory water safety standby valve. The opening difference is formed between the delivery water valve and the low-level valve, so that the pipe section is always kept at a full water level, the empty pipe of the main pipeline is eliminated, and the water hammer impact caused by gravity-type falling of the delivery water is solved.
The constant pressure regulating control point is integrally moved downwards through a low-level control valve arranged at a low altitude. The unfavorable conditions that the low pressure of the clean water tank is before the valve and the high pressure of the main pipe network is after the valve in the prior art are changed into a safer and more reliable regulation control mode that the high pressure of the water leaving the factory before the valve is changed to the low-level valve and the low pressure of the main pipe network is after the valve.
Preferably, the low-level control valve is a piston type flow regulating valve, the piston type flow regulating valve is used for replacing a common electric valve, and the constant regulation of the pressure behind the valve can be realized more accurately by utilizing the linear flow regulating characteristic of the piston type flow regulating valve, so that the pressure fluctuation of a subsequent pipe network is effectively controlled. In the figure, the actual water head between a water valve before the valve leaves a factory and a low-level control valve, and the water head after the valve is the pressure level of the urban pipe network after regulation and control.
S2, respectively arranging pressure transmitters in front of and behind the low-level control valve, wherein the pressure transmitter before the valve is used for monitoring the water head between a water plant and the low-level control valve, the data of the pressure transmitter after the valve is used as an adjusting value of constant-pressure water supply, and the target pressure of the system is set according to the adjusting value; the valve adjusting mode is step control, a numerical value Pr is set according to the pressure behind the valve, and when the pressure behind the valve transmitting value Pr _ b is less than Pr-0.01, the valve opening degree od = od + 1; when the post-valve pressure transmitting value Pr _ b > Pr +0.01, the valve opening degree od = od-1. Where time delay t =10s for removing pressure jitter from time, ± 0.01 is the pressure filter constant. By the method, the response time of the pressure control of the pipe section of the original gravity type constant-pressure water supply method can be shortened to the second level from two minutes, the closed-loop control of the constant pressure of the main pipe section is realized, and the method is safer and more accurate.
And S3, dividing the system target pressure into a high-pressure section and a low-pressure section according to the urban water supply pressure requirement, wherein the low-pressure section is used for meeting the pressure regulation requirement of the urban low water supply pressure time interval, and the high-pressure section is used for meeting the pressure regulation requirements of the urban water supply pressure time interval and the high water supply pressure time interval. Wherein the low water supply pressure time period is 1: 30-5: 30; the high water supply pressure time period is 6: 30-9: 00 and 17: 30-23: 00, and the rest time periods are medium water supply pressure time periods; the system target pressure of the high-pressure section is set to 0.4MPa, and the system target pressure of the low-pressure section is set to 0.5 MPa.
The pressure behind the DN560 valve is set to be 0.4MPa, so that the requirement of constant pressure water supply in the low and middle sections can be met, and the requirement of basic water use in most areas can be met by changing the constant control of the sections. The pressure behind the DN630 valve is set to be 0.5MPa, so that the constant-pressure water supply requirement of the middle and high sections can be met. By changing the constant control of the sections, the constant-pressure water supply requirement in urban areas can be completely met.
When the valve back pressure value of the low-level control valve is larger than the system target pressure, the control system outputs a current signal through a program, pressure jitter is eliminated by delaying execution according to 10s each time, and the valve opening degree is decreased progressively; and when the value of the pressure after the valve is smaller than the target pressure of the system, the system controls the opening of the valve to increase progressively until the pressure after the valve reaches the target pressure of the system.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (6)
1. A gravity type constant-pressure water supply method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
s1, arranging a low-level control valve at a low point of a main delivery water pipeline, wherein the low-level control valve automatically controls the opening degree of the valve according to pressure requirements;
s2, respectively arranging pressure transmitters in front of and behind the low-level control valve, wherein the pressure transmitter before the valve is used for monitoring the water head between a water plant and the low-level control valve, the data of the pressure transmitter after the valve is used as an adjusting value of constant-pressure water supply, and the target pressure of the system is set according to the adjusting value;
and S3, dividing the system target pressure into a high-pressure section and a low-pressure section according to the urban water supply pressure requirement, wherein the low-pressure section is used for meeting the pressure regulation requirement of the urban low water supply pressure time interval, and the high-pressure section is used for meeting the pressure regulation requirements of the urban water supply pressure time interval and the high water supply pressure time interval.
2. A gravity type constant pressure water supply method according to claim 1, wherein: in step S1, the low point is an average altitude position of the urban water supply point.
3. A gravity type constant pressure water supply method according to claim 1, wherein: when the valve back pressure value of the low-level control valve is larger than the system target pressure, the control system outputs a current signal through a program, pressure jitter is eliminated by taking the first time as delay execution every time, and the valve opening degree is decreased progressively; and when the value of the pressure after the valve is smaller than the target pressure of the system, the system controls the opening of the valve to increase progressively until the pressure after the valve reaches the target pressure of the system.
4. A gravity type constant pressure water supply method according to claim 3, wherein: the system target pressure of the high-pressure section is set to 0.4MPa, and the system target pressure of the low-pressure section is set to 0.5 MPa.
5. A gravity type constant pressure water supply method according to claim 1, wherein: the low-level control valve is a piston type flow regulating valve.
6. A gravity type constant pressure water supply method according to claim 1, wherein: in the step S3, the low water supply pressure time interval is 1: 30-5: 30; the high water supply pressure time period is 6: 30-9: 00 and 17: 30-23: 00, and the rest time periods are medium water supply pressure time periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110556788.4A CN113187030A (en) | 2021-05-21 | 2021-05-21 | Gravity type constant pressure water supply method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110556788.4A CN113187030A (en) | 2021-05-21 | 2021-05-21 | Gravity type constant pressure water supply method |
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| CN113187030A true CN113187030A (en) | 2021-07-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5740832A (en) * | 1996-11-05 | 1998-04-21 | Griffin & Cantrell Company, Inc. | Elevated cover for backflow prevention device |
| CN203878670U (en) * | 2014-05-27 | 2014-10-15 | 安徽舜禹水务实业有限公司 | Variable-frequency and multi-constant-pressure energy-saving water supply system |
| CN205116279U (en) * | 2015-09-28 | 2016-03-30 | 云南大红山管道有限公司 | High height above sea level pipeline water delivery system of big pipe diameter of long distance |
| CN106120956A (en) * | 2016-08-15 | 2016-11-16 | 中国电建集团贵阳勘测设计研究院有限公司 | Method for supplying water to mountainous area users and multistage water supply system |
| CN111270728A (en) * | 2020-01-21 | 2020-06-12 | 重庆垫江水务有限公司 | Gravity type constant pressure water supply method |
-
2021
- 2021-05-21 CN CN202110556788.4A patent/CN113187030A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5740832A (en) * | 1996-11-05 | 1998-04-21 | Griffin & Cantrell Company, Inc. | Elevated cover for backflow prevention device |
| CN203878670U (en) * | 2014-05-27 | 2014-10-15 | 安徽舜禹水务实业有限公司 | Variable-frequency and multi-constant-pressure energy-saving water supply system |
| CN205116279U (en) * | 2015-09-28 | 2016-03-30 | 云南大红山管道有限公司 | High height above sea level pipeline water delivery system of big pipe diameter of long distance |
| CN106120956A (en) * | 2016-08-15 | 2016-11-16 | 中国电建集团贵阳勘测设计研究院有限公司 | Method for supplying water to mountainous area users and multistage water supply system |
| CN111270728A (en) * | 2020-01-21 | 2020-06-12 | 重庆垫江水务有限公司 | Gravity type constant pressure water supply method |
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Application publication date: 20210730 |