CN112031080B - Control method of constant-pressure pump station with auxiliary flow regulation function - Google Patents
Control method of constant-pressure pump station with auxiliary flow regulation function Download PDFInfo
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- CN112031080B CN112031080B CN202010830608.2A CN202010830608A CN112031080B CN 112031080 B CN112031080 B CN 112031080B CN 202010830608 A CN202010830608 A CN 202010830608A CN 112031080 B CN112031080 B CN 112031080B
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- 230000033228 biological regulation Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 144
- 230000001105 regulatory effect Effects 0.000 claims abstract description 23
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000000875 corresponding effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009064 short-term regulation Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
-
- 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
- E03B7/072—Arrangement of flowmeters
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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
- 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
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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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
- E03B7/09—Component parts or accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Control Of Fluid Pressure (AREA)
Abstract
The invention provides a control method of a constant pressure pump station with an auxiliary flow regulation function, which comprises the following steps: setting parameters, setting in a control system, and entering an automatic operation state; judging the water supply requirement, and if the water supply requirement is greater than a flow threshold value, adjusting by a main flow adjusting mode; if the flow rate is smaller than the flow rate threshold value, the auxiliary flow rate adjusting mode is used for adjusting; wherein, the main flow regulation mode: starting a main pump, closing an auxiliary small pump, and enabling the flow to be larger than a threshold value; auxiliary flow regulation mode: turning off the main pump and the auxiliary small pump, starting the pressure stabilizing compensator firstly, wherein the water supply duration does not exceed the set time limit; if the water supply time length exceeds the set time limit, starting the auxiliary small pump, and if the water supply demand flow is within the flow interval range of the auxiliary small pump, adjusting by the auxiliary small pump; and if the water supply demand flow is less than the lower limit of the flow interval of the auxiliary small pump, starting the bypass branch at the same time. The problem of water supply flow regulation failure when the flow demand is smaller than the lower limit of the main pump flow range is effectively solved, and low-flow water supply can be regulated and stabilized for a long time.
Description
Technical Field
The invention relates to the technical field of flow regulation of constant-pressure water supply equipment, in particular to a control method of a constant-pressure pump station with an auxiliary flow regulation function.
Background
The flow regulation interval of the traditional constant-pressure water supply equipment is limited by the constant-torque applicable frequency interval of the motor, if the constant-torque frequency interval is 5-50 HZ, when the flow regulation requirement is less than the minimum working frequency of the motor, the host regulation function fails.
In the current constant pressure water supply equipment, a pressure stabilizing compensator is usually arranged on a water supply network to compensate the water supply requirement of small flow. When the flow demand is less than the minimum working frequency of the motor, the motor and the pump body are not started, and the pressure stabilizer automatically performs pressure compensation according to pressure loss to supply corresponding flow.
However, the regulation method of the pressure-stabilizing compensator is only suitable for short-term regulation of small-flow supply, and when the water supply with small flow is needed for a long time and the required water quantity exceeds the water quantity supply range of the pressure-stabilizing compensator, the regulation function of the pressure-stabilizing compensator is disabled. In addition, the main function of the pressure-stabilizing compensator is to maintain the water pressure in the water supply pipe network stable, and the flow rate supply is controlled by the pressure change, so that the actual flow rate of the supplied water cannot be directly and accurately controlled.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a control method of a constant pressure pump station with an auxiliary flow regulation function, solves the problem of failure of the flow regulation function when the regulation requirement of the water supply flow of the constant pressure pump station is smaller than the constant torque applicable frequency interval of a motor, achieves the purpose of eliminating a flow regulation dead zone, and realizes real stepless flow regulation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a constant pressure pump station with an auxiliary flow regulation function comprises a water inlet pipeline, a water outlet pipeline, a pump set and a control system, wherein the pump set comprises a main pump and an auxiliary small pump which are connected in parallel between the water inlet pipeline and the water outlet pipeline; the main pump branch and the auxiliary small pump branch respectively comprise a butterfly valve A arranged at the front end of the pump body, and a check valve and a butterfly valve B arranged at the rear end of the pump body; the water inlet pipeline is connected with the water storage tank; the water outlet pipeline is connected with a water supply pipe network, and a pressure sensor, a pressure stabilizing compensator, a first flowmeter and a first valve are arranged on the water outlet pipeline; a bypass branch is arranged on the water outlet pipeline between the first flowmeter and the first valve and is connected back to the reservoir, and a regulating valve and a second flowmeter are arranged on the bypass branch; the control system is connected with the main pump, the auxiliary small pump, the butterfly valve A, the butterfly valve B, the pressure sensor, the first flowmeter, the first valve, the regulating valve and the second flowmeter.
Further, the lower limit of the flow interval of the main pump is smaller than or equal to the upper limit of the flow interval of the auxiliary small pump.
Further, the maximum flow of the regulating valve is larger than or equal to the lower limit of the flow interval of the auxiliary small pump.
Furthermore, a third flow meter is further arranged on a water outlet pipeline between the bypass branch and the first valve, and the third flow meter is connected with the control system.
Further, the pump group comprises N main pumps and an auxiliary small pump.
Furthermore, the control system comprises a controller and a frequency converter which are connected, wherein the frequency converter and the main pump, and the frequency converter and the auxiliary small pump are connected in a one-to-one configuration mode.
Furthermore, the pressure stabilizing compensator is a diaphragm air pressure tank, a second valve is arranged at the joint of the diaphragm air pressure tank and the water outlet pipeline, and the second valve is connected with the control system.
Further, the cistern is equipped with inlet tube and liquid level monitor, be equipped with the third valve on the inlet tube, liquid level monitor and third valve all are connected with control system, and are correlated with.
A control method of a constant pressure pump station with an auxiliary flow regulation function is applied to any one of the constant pressure pump stations, and comprises the following steps:
setting parameters, namely setting an operating pressure value range, a pressure sensor range, pump changing time, a flow threshold value and continuous operating time limit of a voltage stabilizing compensator in a control system according to actual conditions, storing and exiting, and enabling the control system to enter an automatic operating state;
judging the water supply demand, and if the water supply demand is greater than a flow threshold, adjusting the flow of the constant-pressure pump station according to a main flow adjusting mode; if the water supply demand is smaller than the flow threshold, the flow of the constant pressure pump station is adjusted according to the auxiliary flow adjusting mode;
wherein the primary flow regulation mode: starting a main pump to perform variable frequency operation, closing an auxiliary small pump, controlling the pressure of a water outlet pipeline within a specified pressure value range, and controlling the flow to be greater than a threshold value;
the auxiliary flow regulation mode: the main pump and the auxiliary small pump are closed, the pressure stabilizing compensator is started to control the pressure of the water outlet pipeline within a specified pressure value range, water supply is stopped when the water supply duration does not exceed a set time limit, and the pressure and flow are regulated by the pressure stabilizing compensator; if the water supply time exceeds the set time limit, the auxiliary small pump is started to control the pressure of the water outlet pipeline within a specified pressure value range, and if the water supply demand flow is within the flow interval range of the auxiliary small pump, the auxiliary small pump is used for adjusting the pressure and the flow; and if the required water supply flow is less than the lower limit of the flow interval of the auxiliary small pump, starting the bypass branch, and controlling the opening of the regulating valve according to the comparison between the measured data of the first flowmeter and the required flow so as to enable the outlet flow of the first valve to be consistent with the required flow.
Furthermore, the starting or closing of the main pump and the auxiliary small pump are linked with the corresponding butterfly valves B.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a constant pressure pump station and a control method, wherein an auxiliary small pump connected with a main pump in parallel is arranged in a pump set, a pressure sensor, a pressure stabilizing compensator and a bypass branch are arranged on a water outlet pipeline, the bypass branch is connected to a reservoir in a return mode, a first flowmeter is arranged on the water outlet pipeline, and an adjusting valve and a second flowmeter are arranged on the bypass branch; through the mutual cooperation operation of steady voltage compensator, attached little pump and bypass branch road, effectively solve the water supply flow regulation inefficacy problem when the flow demand is less than main pump flow range lower limit, can be long-time, steady voltage, adjust low flow water supply. The constant pressure pump station is reasonable in design, simple and feasible in control method, easy to popularize and apply and suitable for more occasions.
2. The pressure stabilizing compensator of the constant pressure pump station on the water outlet pipeline can adjust the pressure and flow of the water outlet pipeline within a certain time limit, realize small-flow water supply adjustment, reduce frequent starting of the auxiliary small pump and prolong the service life of the auxiliary small pump; in addition, when the device is stopped and is dormant, the device plays a role in energy storage and pressure maintaining, ensures that the pressure of a water outlet pipeline and a water supply network is maintained stably, compensates the leakage of the pipe network, and ensures that a pump station can continuously supply water; the pressure sensor also has the functions of eliminating water hammer effect and pressure jitter, and the normal use of the pressure sensor is ensured.
3. The small pump and the bypass branch are designed to realize accurate stepless regulation of small-flow water supply, and the water supply system can run for a long time with low energy consumption, thereby reducing the waste of water sources and the consumption of energy.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the constant pressure pump station according to the present invention.
Fig. 2 is a flowchart of a control method of the present invention.
Reference numerals:
1: a water inlet pipeline; 2. a water outlet pipeline; 21. a pressure sensor; 22. a first flow meter; 23. a first valve; 24. a third flow meter; 3. a main pump; 31. a butterfly valve A; 32. a check valve; 33. a butterfly valve B; 4. an attached small pump; 5. a control system; 6. a reservoir; 61. a water inlet pipe; 62. a liquid level monitor; 63. a third valve; 7. a voltage stabilizing compensator; 71. a second valve; 8. a bypass branch; 81. adjusting a valve; 82. a second flow meter.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the embodiment of the present invention provides a constant pressure pump station with an auxiliary flow rate regulating function, which comprises an inlet water pipeline 1, an outlet water pipeline 2, a pump set and control system 5, and the like.
The pump unit comprises a main pump 3 and an auxiliary small pump 4 which are connected in parallel between the water inlet pipeline 1 and the water outlet pipeline 2, and the working frequency interval and the corresponding flow regulation range of the main pump 3 are larger than those of the auxiliary small pump 4. A butterfly valve A31, a check valve 32 and a butterfly valve B33 are arranged on a main pump branch and an auxiliary small pump branch which are connected in parallel in the pump set, wherein the butterfly valve A31 is positioned at the front end, namely the inlet end, of the main pump 3 or the auxiliary small pump 4; a check valve 32 and a butterfly valve B33 are located at the rear end, i.e., the outlet end, of the main pump 3 or the sub-pump 4.
The water inlet pipe 1 is connected with the water storage tank 6, namely the water inlet pipe 1 is connected with the water storage tank 6 and the inlet end of the pump group. The water outlet pipeline 2 is connected with the outlet end of the pump set and a water supply network. The water outlet pipe 2 is provided with a pressure sensor 21, a pressure stabilizing compensator 7, a first flow meter 22, a first valve 23 and the like. The first valve 23 is close to the water supply network, a bypass branch 8 is arranged on the water outlet pipe 2 between the first flowmeter 22 and the first valve 23, and the other end of the bypass branch 8 is connected with the water reservoir 6, i.e. the bypass branch 8 is connected back to the water reservoir 6. The bypass branch 8 is provided with an adjusting valve 81 and a second flow meter 82, and the adjusting valve 81 can control the flow rate by adjusting the opening degree thereof. The pressure sensor 21 and the surge compensator 7 are located on the side of the first flow meter 22 remote from the first valve 23.
The control system 5 is electrically connected to the main pump 3, the sub-pump 4, the butterfly valve a 31, the butterfly valve B33, the pressure sensor 21, the first flow meter 22, the first valve 23, the regulator valve 81, the second flow meter 82, and the like. The control system 5 can control the opening, closing and running frequency of the main pump 3 and the auxiliary small pump 4; the opening and closing of the butterfly valve A31, the butterfly valve B33, the first valve 23 and the regulating valve 81 and the opening of the regulating valve 81 can be controlled; detection signals of the pressure sensor 21, the first flow meter 22, and the second flow meter 82 may be received.
The lower limit of the flow interval of the main pump 3 is less than or equal to the upper limit of the flow period of the auxiliary small pump 4, namely the flow interval of the main pump 3 is intersected with the flow interval of the auxiliary small pump 4, so that the continuity of flow regulation is ensured.
The maximum flow rate of the regulating valve 81 should be greater than or equal to the lower limit of the flow interval of the auxiliary small pump 4. Namely, the maximum flow rate that the bypass branch 8 can flow through is greater than or equal to the lower limit of the flow interval of the auxiliary small pump 4, and when the flow rate of the water outlet pipeline 1 is regulated, the regulating range can be infinitely close to zero, so that the dead zone of small flow rate regulation failure is eliminated, and stepless flow rate regulation is realized.
A third flow meter 24 is further arranged on the water outlet pipeline 2 between the bypass branch 8 and the first valve 23, the third flow meter 24 is connected with the control system 5, water flow rate actually discharged to a water supply network by the water pipeline 2 can be detected in real time, and detected data are transmitted to the control system 5.
The pump group may include N main pumps 3 and one subsidiary small pump 4, the N main pumps 3 each being connected in parallel with the subsidiary small pump 4. N is a natural number, i.e. the number of main pumps 3 may be 1, 2, 3, 4 … …. The N main pumps 3 can be operated independently or simultaneously; the main pump 3 and the auxiliary small pump 4 operate respectively and do not operate simultaneously.
The control system 5 comprises a controller, frequency converters and the like which are connected, wherein the number of the frequency converters is N +1, the frequency converters are connected with the main pump 3, and the frequency converters and the auxiliary small pumps 4 are connected in a one-to-one configuration mode, namely, one frequency converter controls one main pump 3 or one auxiliary small pump 4.
The pressure-stabilizing compensator 7 is preferably a diaphragm pressure tank, which serves to buffer pressure fluctuations and partial water supply. The connection part of the diaphragm air pressure tank and the water outlet pipeline 2 is provided with a second valve 71, the second valve 71 is connected with the control system 5, and the control system 5 controls the opening or closing of the second valve 71.
The water reservoir 6 is provided with a water inlet pipe 61 and a liquid level monitor 62, the water inlet pipe 61 is connected with a municipal water supply pipeline (tap water pipe), and the liquid level monitor 62 is installed in the water reservoir 6 and used for monitoring the water quantity of the water reservoir 6. The inlet pipe 61 is provided with a third valve 63, and the liquid level monitor 62 and the third valve 63 are connected with the control system 5 and are mutually associated. The liquid level monitor 62 transmits the detected liquid level information to the control system 5 in real time, the control system 5 controls the opening or closing of the third valve 63 according to the liquid level change, and the water is filled into the water storage tank 6, so that the water quantity in the water storage tank 6 is ensured within a normal range value, and the normal water supply of the constant-pressure pump station is ensured.
As shown in fig. 2, the embodiment of the present invention further provides a control method for a constant pressure pump station with an auxiliary flow rate regulation function, which is suitable for operating the above constant pressure pump station.
The control method comprises parameter setting and automatic operation. The parameter setting mainly comprises setting an operating pressure value range (a water outlet pipeline and a water supply network), a pressure sensor measuring range, pump changing time, a flow threshold value, a pressure stabilizing compensator continuous operation time limit and the like in the control system 5 according to actual conditions, and then storing and quitting the setting interface. The start-up control system 5 enters an automatic run state.
When the water supply system automatically operates, firstly, the water supply demand is judged, and the demand is judged according to the known demand or the pressure change and the flow of the water outlet pipeline 2.
If the water supply demand is larger than the set flow threshold, adjusting the flow of the constant-pressure pump station according to the main flow adjusting mode; and if the water supply demand is smaller than the set flow threshold, adjusting the flow of the constant-pressure pump station according to the auxiliary flow adjusting mode. The set flow threshold value is related to the flow interval of the main pump 3 and the auxiliary small pump 4, is less than or equal to the upper limit of the flow interval of the auxiliary small pump 4, and is greater than or equal to the lower limit of the flow interval of the main pump 3.
Main flow regulation mode, i.e. main pump flow regulation mode: the main pump 3 is started to carry out variable frequency operation, the pressure of the water outlet pipeline 2 and the water supply pipe network is controlled within a specified pressure value range, and the water outlet flow of the water outlet pipeline 2 is larger than a set flow threshold value. In this regulation mode, the auxiliary small pump 4 is closed and not operated, the second valve 71 is closed and the surge compensator 7 is not operated.
Auxiliary flow regulation mode: the main pump 3 and the auxiliary small pump 4 are closed, and the pressure-stabilizing compensator 7 is started to control the pressure of the water outlet pipeline 2 within a specified pressure value range; then judging the water supply time, if the water supply time does not exceed the set continuous operation time limit of the pressure stabilizing compensator, adjusting the pressure and the flow of the water outlet pipeline 2 by the pressure stabilizing compensator 7, and after the water supply stops, enabling the constant pressure pump station to enter a dormant state; if the water supply time exceeds the set continuous operation time limit of the pressure stabilizing compensator, starting the auxiliary small pump 4 to control the pressure of the water outlet pipeline 2 and the water supply network within a specified pressure value range; further judging the water supply demand flow, and if the water supply demand flow is within the flow interval range of the auxiliary small pump 4, adjusting the pressure and the flow by the auxiliary small pump 4; if the required water supply flow is smaller than the lower limit of the flow interval of the auxiliary small pump 4, the bypass branch 8 is started at the same time, that is, the regulating valve 81 is opened, and the opening degree of the regulating valve 81 is controlled according to the comparison between the flow data measured by the first flowmeter 22 and the required flow, so that the outlet flow of the first valve 23 is consistent with the required flow.
In order to prevent the influence of the water hammer effect on the auxiliary small pump 4 at the 3-stage main pump, the main pump 3 and the auxiliary small pump 4 are started or closed in linkage with the butterfly valve B33 on the corresponding branch. And the water pressure fluctuation is linked with the second valve 71 of the pressure stabilizing compensator 7, so that the impact of the water pressure fluctuation on the pipeline during starting or closing is reduced.
In the foregoing, only certain exemplary embodiments have been described briefly. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate an orientation or positional relationship based on that shown in the drawings, or the orientation or positional relationship conventionally used in the use of the products of the present invention, or the orientation or positional relationship conventionally understood by those skilled in the art, are merely for convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Furthermore, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Claims (7)
1. A control method of a constant pressure pump station with an auxiliary flow regulation function is applied to the constant pressure pump station, the constant pressure pump station comprises a water inlet pipeline (1), a water outlet pipeline (2), a pump set and a control system (5), and the pump set comprises a main pump (3) and an auxiliary small pump (4) which are connected in parallel between the water inlet pipeline (1) and the water outlet pipeline (2); the main pump branch and the auxiliary small pump branch respectively comprise a butterfly valve A (31) arranged at the front end of the pump body, a check valve (32) arranged at the rear end of the pump body and a butterfly valve B (33); the water inlet pipeline (1) is connected with the water storage tank (6); the water outlet pipeline (2) is connected with a water supply pipe network, and a pressure sensor (21), a pressure stabilizing compensator (7), a first flowmeter (22) and a first valve (23) are arranged on the water outlet pipeline (2); a bypass branch (8) is arranged on the water outlet pipeline (2) between the first flowmeter (22) and the first valve (23), the bypass branch (8) is connected to the reservoir (6) in a returning mode, and an adjusting valve (81) and a second flowmeter (82) are arranged on the bypass branch (8); the lower limit of the flow interval of the main pump (3) is less than or equal to the upper limit of the flow interval of the auxiliary small pump (4), and the maximum flow of the regulating valve (81) is greater than or equal to the lower limit of the flow interval of the auxiliary small pump (4); the control system (5) is connected with the main pump (3), the auxiliary small pump (4), the butterfly valve A (31), the butterfly valve B (33), the pressure sensor (21), the first flowmeter (22), the first valve (23), the regulating valve (81) and the second flowmeter (82);
the control method is characterized by comprising the following steps:
setting parameters, namely setting an operating pressure value range, a pressure sensor range, pump change time, a flow threshold value and continuous operating time limit of a pressure stabilizing compensator in a control system (5) according to actual conditions, storing and exiting, and enabling the control system (5) to enter an automatic operating state;
judging the water supply demand, and if the water supply demand is greater than a flow threshold, adjusting the flow of the constant-pressure pump station according to a main flow adjusting mode; if the water supply demand is smaller than the flow threshold, the flow of the constant pressure pump station is adjusted according to the auxiliary flow adjusting mode;
wherein the primary flow regulation mode: starting a main pump (3) to carry out variable frequency operation, closing an auxiliary small pump (4), controlling the pressure of a water outlet pipeline (2) within a specified pressure value range, and controlling the flow to be greater than a threshold value;
the auxiliary flow regulation mode: the main pump (3) and the auxiliary small pump (4) are closed, firstly, the pressure stabilizing compensator (7) is started to control the pressure of the water outlet pipeline (2) to be within a specified pressure value range, water supply is stopped when the water supply duration does not exceed a set time limit, and the pressure and flow are regulated by the pressure stabilizing compensator (7); if the water supply time exceeds the set time limit, the auxiliary small pump (4) is started to control the pressure of the water outlet pipeline (2) to be within a specified pressure value range, and if the water supply demand flow is within the flow interval range of the auxiliary small pump (4), the auxiliary small pump (4) is used for adjusting the pressure and the flow; if the required water supply flow is smaller than the lower limit of the flow interval of the auxiliary small pump (4), the bypass branch (8) is started at the same time, and the opening degree of the regulating valve (81) is controlled according to the comparison between the measured data of the first flowmeter (22) and the required flow, so that the outlet flow of the first valve (23) is consistent with the required flow.
2. The method for controlling the constant pressure pump station with the auxiliary flow regulating function according to claim 1, wherein a third flow meter (24) is further arranged on the water outlet pipeline (2) between the bypass branch (8) and the first valve (23), and the third flow meter (24) is connected with the control system (5).
3. The control method of a constant pressure pump station with auxiliary flow regulation according to claim 1 or 2, characterized in that the pump group comprises N main pumps (3) and one auxiliary small pump (4).
4. The method for controlling the constant pressure pump station with the auxiliary flow regulating function according to claim 3, wherein the control system (5) comprises a controller and a frequency converter which are connected, and the frequency converter and the main pump (3) and the frequency converter and the auxiliary small pump (4) are connected in a one-to-one configuration.
5. The method for controlling the constant pressure pump station with the auxiliary flow regulating function according to claim 1, wherein the pressure stabilizing compensator (7) is a diaphragm air pressure tank, a second valve (71) is arranged at the joint of the diaphragm air pressure tank and the water outlet pipeline (2), and the second valve (71) is connected with the control system (5).
6. The method for controlling the constant pressure pump station with the auxiliary flow regulating function according to claim 1, wherein the water reservoir (6) is provided with a water inlet pipe (61) and a liquid level monitor (62), the water inlet pipe (61) is provided with a third valve (63), and the liquid level monitor (62) and the third valve (63) are both connected with and associated with the control system (5).
7. The method for controlling the constant pressure pump station with the auxiliary flow regulating function according to claim 1, wherein the main pump (3) and the auxiliary small pump (4) are started or closed by being linked with the corresponding butterfly valve B (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010830608.2A CN112031080B (en) | 2020-08-18 | 2020-08-18 | Control method of constant-pressure pump station with auxiliary flow regulation function |
Applications Claiming Priority (1)
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| CN113075941A (en) * | 2021-03-29 | 2021-07-06 | 广东韶钢松山股份有限公司 | Water addition system and water addition control method |
| CN113358319B (en) * | 2021-08-09 | 2021-11-09 | 中国空气动力研究与发展中心低速空气动力研究所 | Air inlet simulation system and method |
| CN113982969A (en) * | 2021-09-02 | 2022-01-28 | 浙江浙能金华燃机发电有限责任公司 | Instrument control simulation training platform |
| CN114411872B (en) * | 2021-12-24 | 2023-11-07 | 江苏慧仁生态科技有限公司 | Economical intelligent water flow distribution management method and system |
| CN114809182B (en) * | 2022-05-10 | 2023-09-22 | 中广核研究院有限公司 | Liquid pressure control system |
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