CN109853674B - Constant-pressure water supply control method and system - Google Patents
Constant-pressure water supply control method and system Download PDFInfo
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- CN109853674B CN109853674B CN201910040624.9A CN201910040624A CN109853674B CN 109853674 B CN109853674 B CN 109853674B CN 201910040624 A CN201910040624 A CN 201910040624A CN 109853674 B CN109853674 B CN 109853674B
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Abstract
The embodiment of the invention provides a constant-pressure water supply control method and a system, wherein the constant-pressure water supply control method is applied to a frequency converter to control 1 main pump motor and N auxiliary pump motors, and the method comprises the following steps: initializing parameters; if the water supply requirement value is increased, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode so as to enable the pressure value of the pipe network to reach a target pressure value; and if the water supply requirement value is reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value. By adopting the constant-pressure water supply method provided by the embodiment of the invention, the pressure value of the pipe network can be maintained at a constant value under different water supply requirements by automatically adjusting the operating frequency of the main pump motor and controlling the auxiliary pump motor.
Description
Technical Field
The invention belongs to the technical field of frequency converters, and particularly relates to a constant-pressure water supply control method and system.
Background
In order to save energy, in water pump water supply applications, a frequency converter is generally used to drive a water pump to operate so as to supply water at a constant pressure. When the pressure of the pipe network is insufficient, an auxiliary water pump motor needs to be driven to assist a main pump motor to carry out constant-pressure water supply regulation. In the prior art, when the power frequency auxiliary water pump motor is switched and the pressure of a pipe network is zero, the working condition of system air leakage exists, the frequency of the variable-frequency main pump motor cannot be accurately and automatically adjusted, and the purpose of constant-pressure water supply cannot be achieved.
Disclosure of Invention
In view of the above, the present invention provides a constant pressure water supply control method and system, which can maintain the pressure value of the pipe network at a constant value by automatically adjusting the operating frequency of the main pump motor and controlling the auxiliary pump motor under the condition that the pressure values of the pipe network are different due to different water supply requirements.
The first aspect of the embodiments of the present invention provides a constant-pressure water supply control method, which is applied to a frequency converter to control 1 main pump motor and N auxiliary pump motors, and includes:
initializing parameters, wherein the parameter initialization comprises initializing a pressure set value, a frequency set value and M preset water supply demand values, the pressure set value comprises a target pressure value and a dormancy awakening pressure value, and the frequency set value comprises a maximum frequency value, a dormancy frequency value and a lower limit frequency value;
if the water supply requirement value is increased, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value;
if the water supply requirement value is reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value.
Its further technical scheme does, according to a preset adjustment mode to the operating frequency of main pump motor and N assist the pump motor and adjust to make the pipe network pressure value reach the target pressure value, include:
judging whether the working frequency of the main pump motor is equal to the maximum frequency value or not;
if the working frequency of the main pump motor is judged not to be equal to the maximum frequency value, the working frequency of the main pump motor is adjusted upwards according to a preset main pump frequency increasing mode;
and if the pipe network pressure value is not equal to the target pressure value, returning to the step of judging whether the working frequency of the main pump motor is equal to the maximum frequency value.
According to a further technical scheme, after the step of judging whether the working frequency of the main pump motor is equal to the maximum frequency value, the method further comprises the following steps:
if the working frequency of the main pump motor is judged to be equal to the maximum frequency value, one of the N auxiliary pump motors is started according to a preset auxiliary pump starting mode;
if the pressure value of the pipe network is judged to be not smaller than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value or not;
if the pipe network pressure value is judged not to be equal to the target pressure value, the working frequency of a main pump motor is adjusted downwards according to a preset main pump frequency reduction mode, and the step of judging whether the pipe network pressure value is equal to the target pressure value is returned;
and if the pressure value of the pipe network is judged to be smaller than the target pressure value, returning to the step of starting one of the N auxiliary pump motors according to a preset auxiliary pump starting mode.
Its further technical scheme does, according to the second preset adjustment mode to the operating frequency of main pump motor and N assist the pump motor and adjust to make the pipe network pressure value reach the target pressure value, include:
judging whether the working frequency of the main pump motor is equal to the dormancy frequency value or not;
if the working frequency of the main pump motor is judged not to be equal to the dormancy frequency value, the working frequency of the main pump motor is adjusted downwards according to a preset main pump frequency reduction mode;
and if the pipe network pressure value is not equal to the target pressure value, returning to the step of judging whether the working frequency of the main pump motor is equal to the dormancy frequency value.
According to a further technical scheme, after the judging whether the working frequency of the main pump motor is equal to the sleeping frequency value, the method further comprises the following steps:
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, one of the N auxiliary pump motors is turned off according to a preset auxiliary pump turn-off mode;
if the pressure value of the pipe network is not larger than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value or not;
and if the pipe network pressure value is not equal to the target pressure value, adjusting the working frequency of the main pump motor according to a preset main pump frequency increasing mode, and returning to the step of judging whether the pipe network pressure value is equal to the target pressure value.
According to a further technical scheme, after the step of judging whether the pressure value of the pipe network is equal to the target pressure value, the method further comprises the following steps:
if the pipe network pressure value is equal to the target pressure value, judging whether all the N auxiliary pump motors are closed;
if the N auxiliary pump motors are all turned off, judging whether the working frequency of the main pump motor is equal to the dormancy frequency value;
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, the working frequency of the main pump motor is adjusted to be zero according to a preset main pump frequency reduction mode;
judging whether the pressure value of the pipe network is equal to the dormancy awakening pressure value or not;
if the pipe network pressure value is equal to the dormancy awakening pressure value, adjusting the working frequency of the main pump motor to the lower limit frequency value according to a preset main pump frequency increasing mode;
judging whether the pressure value of the pipe network is equal to the target pressure value or not;
if the pipe network pressure value is judged not to be equal to the target pressure value, adjusting the working frequency of a main pump motor according to a preset main pump frequency increasing mode, and returning to the step of judging whether the pipe network pressure value is equal to the target pressure value or not;
and if the pipe network pressure value is judged to be equal to the target pressure value, returning to the step of reducing the working frequency of the main pump motor to zero according to a preset main pump frequency reduction mode.
Its further technical scheme does, according to predetermineeing the auxiliary pump mode of opening, open N one in the auxiliary pump motor includes:
judging whether a first preset time interval is reached;
and if the first preset time interval is reached, starting one of the N auxiliary pump motors in a closed state.
Its further technical scheme does, according to predetermineeing and assisting pump off-mode, close N one in assisting the pump motor, include:
judging whether a second preset time interval is reached;
and if the second preset time interval is reached, turning off one of the N auxiliary pump motors in the starting state.
A further technical solution is that, if it is determined that the working frequency of the main pump motor is equal to the sleep frequency value, the method of adjusting the working frequency value of the main pump motor to zero according to a preset main pump frequency reduction mode includes:
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, judging whether the preset delay time is reached;
and if the preset delay time is reached, adjusting the working frequency of the main pump motor to zero according to a preset main pump frequency reduction mode.
A second aspect of the embodiments of the present invention provides a constant-pressure water supply system, including a frequency converter, a main pump motor, and N auxiliary pump motors, where the frequency converter is connected to the main pump motor to control an operating frequency of the main pump motor, and the frequency converter is connected to the N auxiliary pump motors to control on and off of the N auxiliary pump motors, so as to implement any one of the constant-pressure water supply control methods described in the first aspect.
The embodiment of the invention provides a constant-pressure water supply control method and a system, wherein the constant-pressure water supply control method is applied to a frequency converter to control 1 main pump motor and N auxiliary pump motors, and the method comprises the following steps: initializing parameters, wherein the parameter initialization comprises initializing a pressure set value, a frequency set value and M preset water supply demand values, the pressure set value comprises a target pressure value and a dormancy awakening pressure value, and the frequency set value comprises a maximum frequency value, a dormancy frequency value and a lower limit frequency value; if the water supply requirement value is increased, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value; if the water supply requirement value is reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value. By adopting the constant-pressure water supply method provided by the embodiment of the invention, the pressure value of the pipe network can be maintained at a constant value under different water supply requirements by automatically adjusting the operating frequency of the main pump motor and controlling the auxiliary pump motor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a constant pressure water supply control method according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sub-flow of a constant pressure water supply control method according to an embodiment of the present invention;
FIG. 3 is a schematic view of a sub-process of a constant pressure water supply control method according to an embodiment of the present invention;
FIG. 4 is a schematic view of a sub-flow of a constant pressure water supply control method according to an embodiment of the present invention;
FIG. 5 is a schematic view of a sub-flow of a constant pressure water supply control method according to an embodiment of the present invention;
FIG. 6 is a schematic view of a sub-flow of a constant pressure water supply control method according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a constant pressure water supply control system according to an embodiment of the present invention;
fig. 8 is a logic timing diagram of a constant pressure water supply control method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flow chart of a constant pressure water supply control method according to an embodiment of the present invention is shown. As shown in the figure, the constant-pressure water supply control method provided by the embodiment of the invention is applied to a frequency converter to control 1 main pump motor and N auxiliary pump motors, and the method includes steps S110 to S150.
And S110, initializing parameters.
The parameter initialization comprises the initialization operation of a pressure set value, a frequency set value and M preset water supply requirement values, wherein the pressure set value comprises a target pressure value and a dormancy awakening pressure value, and the frequency set value comprises a maximum frequency value, a dormancy frequency value and a lower limit frequency value. The preset pressure constant value for the pipe network is the target pressure value, the sleep awakening pressure value is used for judging whether to awaken the main pump motor, the maximum frequency value is the maximum working frequency of the main pump motor, the sleep frequency value is used for judging whether to enable the main pump motor to enter a sleep state, and the lower limit frequency value is the lower limit value of the main pump motor for automatic frequency adjustment. The M preset water supply demand values comprise first-level to M-level water supply demand values with values sequentially decreasing. In some embodiments, for example the present embodiment, M of said water supply demand values are an arithmetic progression. In some embodiments, such as this embodiment, the first level water supply demand is 100% and the mth level water supply demand is 0%.
And S120, judging whether the water supply demand value is increased or not.
And judging whether the water supply requirement value is increased or not, so that whether the pressure value of the pipe network is reduced or not can be obtained. If the water supply demand value is increased, the pressure value of the pipe network is reduced; and if the water supply demand value is reduced, the pressure value of the pipe network is increased. Wherein, if the water supply demand value is judged to be increased, the step S140 is executed, otherwise, the step S130 is executed.
And S130, if the water supply demand value is not increased, judging whether the water supply demand value is reduced.
In this embodiment, if it is determined that the water supply demand value is not increased, it is further determined whether the water supply demand value is decreased, so as to determine whether the pressure value of the pipe network is increased. If the water supply demand value is judged to be decreased, the step S150 is executed, otherwise, the step S120 is returned to.
And S140, if the water supply requirement value is increased, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value.
In this embodiment, if it is determined that the water supply demand value increases, that is, the pressure value of the pipe network decreases accordingly, and in order to maintain the pressure of the pipe network at the target pressure value, the current pressure value of the pipe network needs to be increased. In this embodiment, the working frequency of the main pump motor and the N auxiliary pump motors are adjusted according to a first preset adjustment mode, so that the pressure value of the pipe network reaches the target pressure value, and then the step S120 is returned to.
Referring to fig. 2, it is a sub-flow diagram of a constant pressure water supply control method according to an embodiment of the present invention. As shown, the step S140 includes sub-steps S1400-S1406.
And S1400, judging whether the working frequency of the main pump motor is equal to the maximum frequency value.
In this embodiment, since it is determined that the water supply demand value increases, and accordingly, the pressure value of the pipe network decreases, the pressure value of the pipe network needs to be increased to maintain the pressure of the pipe network at the target pressure value. By judging whether the working frequency of the main pump motor is equal to the maximum frequency value, if the working frequency of the main pump motor is equal to the maximum frequency value, that is, the main pump motor is already operated at the maximum frequency value, at this time, substep S1403 is executed; and if the operating frequency of the main pump motor is not equal to the maximum frequency value, the substep S1401 is performed.
And S1401, if the working frequency of the main pump motor is judged not to be equal to the maximum frequency value, the working frequency of the main pump motor is adjusted upwards according to a preset main pump frequency increasing mode.
In this embodiment, when the operating frequency of the main pump motor is not equal to the maximum frequency value, the operating frequency of the main pump motor may be adjusted up to enable the main pump motor to operate at a higher operating frequency, so as to further increase the pressure value of the pipe network.
S1402, judging whether the pipe network pressure value is equal to the target pressure value.
In this embodiment, by determining whether the pressure value of the pipe network is equal to the target pressure value, if the pressure value of the pipe network is equal to the target pressure value, the step S120 is executed again; and if the pipe network pressure value is not equal to the target pressure value, returning to execute the substep S1400.
And S1403, if the working frequency of the main pump motor is judged to be equal to the maximum frequency value, one of the N auxiliary pump motors is started according to a preset auxiliary pump starting mode.
In this embodiment, if it is determined that the operating frequency of the main pump motor is equal to the maximum frequency value, that is, the main pump motor has already operated at the maximum frequency value at this time, but the pipe network pressure value has not yet reached the target pressure value, at this time, one of the N auxiliary pump motors is turned on according to a preset auxiliary pump turning-on mode to further increase the pipe network pressure value, and then sub-step S1404 is performed.
Referring to fig. 4, it is a sub-flow diagram of a constant pressure water supply control method according to an embodiment of the present invention. As shown, in some embodiments, such as the present embodiment, the sub-step S1403 includes a step S1403a and a step S1403 b.
S1403a, it is determined whether the first preset time interval is reached.
In this embodiment, to avoid the severe fluctuation of the pressure value of the pipe network, before the auxiliary pump motor is turned on, it is first determined whether a first preset time interval is reached. If the first preset time interval is reached, the step S1403b is executed, otherwise, the step S1403a is executed again.
And S1403b, if the first preset time interval is judged to be reached, starting one of the N auxiliary pump motors in the closed state.
In this embodiment, when it is determined that the first preset time interval is reached, the pressure value of the pipe network is further increased by starting one of the N auxiliary pump motors in the off state. Wherein, the state of the auxiliary pump motor is divided into an opening state and a closing state.
And S1404, judging whether the pipe network pressure value is smaller than the target pressure value.
In this embodiment, after the step S1403 is executed to further increase the pressure value of the pipe network, it needs to be further determined whether the pressure value of the pipe network is smaller than the target pressure value. If the pressure value of the pipe network is not smaller than the target pressure value, the substep S1405 is executed, otherwise, the substep S1403 is executed in a returning mode.
S1405, if the pressure value of the pipe network is judged to be not smaller than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value.
In this embodiment, if it is determined that the pipe network pressure value is not less than the target pressure value, it is further determined whether the pipe network pressure value is equal to the target pressure value. If the pipe network pressure value is not equal to the target pressure value, the substep S1406 is executed, otherwise, the step S120 is executed.
And S1406, if the pipe network pressure value is judged not to be equal to the target pressure value, the working frequency of the main pump motor is adjusted downwards according to a preset main pump frequency reduction mode.
In this embodiment, when the pipe network pressure value is not equal to the target pressure value, that is, when the pipe network pressure value is greater than the target pressure value, the operating frequency of the main pump motor may be adjusted downward to decrease the pipe network pressure value, and then the sub-step S1405 is executed.
S150, if the water supply requirement value is judged to be reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjusting mode so as to enable the pressure value of the pipe network to reach the target pressure value.
In this embodiment, if it is determined that the water supply demand value decreases, that is, the pressure value of the pipe network increases accordingly, and in order to maintain the pressure of the pipe network at the target pressure value, the current pressure value of the pipe network needs to be decreased. In this embodiment, the working frequency of the main pump motor and the N auxiliary pump motors are adjusted according to a second preset adjustment mode, so that the pressure value of the pipe network reaches the target pressure value, and then the step S120 is returned to.
Referring to fig. 3, it is a sub-flow diagram of a constant pressure water supply control method according to an embodiment of the present invention. As shown, in some embodiments, such as this embodiment, the step S150 includes sub-steps S1500-S1513.
S1500, judging whether the working frequency of the main pump motor is equal to the dormancy frequency value.
In this embodiment, since it is determined that the water supply demand value decreases, the pressure value of the pipe network increases accordingly, and the pressure value of the pipe network needs to be decreased to maintain the pressure of the pipe network at the target pressure value. By judging whether the working frequency of the main pump motor is equal to the dormancy frequency value, if the working frequency of the main pump motor is equal to the dormancy frequency value, executing the substep S1503; and if the operating frequency of the main pump motor is not equal to the sleep frequency value, performing the substep S1501.
S1501, if the working frequency of the main pump motor is judged not to be equal to the sleep frequency value, the working frequency of the main pump motor is adjusted downwards according to a preset main pump frequency reduction mode.
In this embodiment, when the operating frequency of the main pump motor is not equal to the sleep frequency value, the operating frequency of the main pump motor may be adjusted downward so that the main pump motor operates at a lower operating frequency, and the pressure value of the pipe network may be further reduced.
S1502, judging whether the pipe network pressure value is equal to the target pressure value.
In this embodiment, by determining whether the pressure value of the pipe network is equal to the target pressure value, if the pressure value of the pipe network is equal to the target pressure value, the step S120 is executed again; and if the pipe network pressure value is not equal to the target pressure value, returning to execute the substep S1500.
And S1503, if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, closing one of the N auxiliary pump motors according to a preset auxiliary pump closing mode.
In this embodiment, if it is determined that the operating frequency of the main pump motor is equal to the sleep frequency value, that is, the main pump motor is already operating at the sleep frequency value at this time, but the pressure value of the pipe network still does not reach the target pressure value, at this time, one of the N auxiliary pump motors is turned off according to a preset auxiliary pump turn-off mode to further reduce the pressure value of the pipe network, and then the substep S1504 is performed.
Referring to fig. 5, it is a schematic view of a sub-process of the constant pressure water supply method according to an embodiment of the present invention. As shown, in some embodiments, such as the present embodiment, the sub-step S1503 includes a step S1503a and a step S1503 b.
S1503a, it is determined whether the second preset time interval is reached.
In this embodiment, to avoid the drastic fluctuation of the pressure value of the pipe network, before the auxiliary pump motor is turned off, it is first determined whether a second preset time interval is reached. If the second preset time interval is reached, the step S1503b is executed, otherwise, the step S1503a is executed again.
And S1503b, if the second preset time interval is reached, turning off one of the N auxiliary pump motors in the on state.
In this embodiment, when it is determined that the second preset time interval is reached, the pressure value of the pipe network is further reduced by turning off one of the N auxiliary pump motors in the turned-off state. Wherein, the state of the auxiliary pump motor is divided into an opening state and a closing state.
S1504, judging whether the pipe network pressure value is larger than the target pressure value.
In this embodiment, after the step S1503 is executed to further reduce the pressure value of the pipe network, it needs to be further determined whether the pressure value of the pipe network is greater than the target pressure value. If the pressure value of the pipe network is not greater than the target pressure value, the substep S1505 is executed, otherwise, the substep S1503 is executed.
S1505, if the pressure value of the pipe network is judged to be not larger than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value or not.
In this embodiment, if it is determined that the pipe network pressure value is not greater than the target pressure value, it is further determined whether the pipe network pressure value is equal to the target pressure value. If the pipe network pressure value is not equal to the target pressure value, the substep S1506 is executed, otherwise, the substep S1507 is executed.
And S1506, if the pipe network pressure value is judged not to be equal to the target pressure value, the working frequency of the main pump motor is adjusted upwards according to a preset main pump frequency increasing mode.
In this embodiment, when the pressure value of the pipe network is not equal to the target pressure value, that is, when the pressure value of the pipe network is smaller than the target pressure value, the working frequency of the main pump motor may be adjusted up to increase the pressure value of the pipe network, and then the substep S1505 is executed in a return manner.
S1507, judging whether the N auxiliary pump motors are completely closed.
In this embodiment, by determining whether all of the N auxiliary pump motors are turned off, it is possible to determine whether to control the main pump motor to enter the sleep state. If it is determined that all of the N auxiliary pump motors are turned off, the substep S1508 is executed, otherwise, the substep S120 is executed.
And S1508, if the N auxiliary pump motors are all turned off, judging whether the working frequency of the main pump motor is equal to the dormancy frequency value.
In this embodiment, if it is determined that all of the N auxiliary pump motors are turned off, it is further determined whether the operating frequency of the main pump motor is equal to the sleep frequency value, so as to determine whether to control the main pump motor to enter a sleep state. If the working frequency of the main pump motor is judged to be equal to the sleep frequency value, the substep S1509 is executed, otherwise, the step S120 is executed again.
S1509, if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, the working frequency of the main pump motor is adjusted to zero according to a preset main pump frequency reduction mode.
In this embodiment, if it is determined that the operating frequency of the main pump motor is equal to the sleep frequency value, the operating frequency of the main pump motor is adjusted down to zero to enable the main pump motor to enter a sleep state, and then the sub-step S1510 is executed.
Referring to fig. 6, it is a sub-flow diagram of a constant pressure water supply control method according to an embodiment of the present invention. As shown, in some embodiments, such as the present embodiment, the sub-step S1509 includes a step S1509a and a step S1509 b.
And S1509a, judging whether the preset delay time is reached.
In this embodiment, to avoid the severe fluctuation of the pressure value of the pipe network, before the working frequency of the main pump motor is adjusted, it is first determined whether a preset delay time is reached. If the preset delay time is reached, the step S1509b is executed, otherwise, the step S1509a is executed again.
And S1509b, if the preset delay time is judged, the working frequency of the main pump motor is adjusted downwards to zero.
In this embodiment, when the preset delay time is reached, the operating frequency of the main pump motor is adjusted to zero, so that the main pump motor enters a sleep state.
And S1510, judging whether the pressure value of the pipe network is equal to the dormancy awakening pressure value.
In this embodiment, by determining whether the pipe network pressure value is equal to the sleep wake-up pressure value, if it is determined that the pipe network pressure value is equal to the sleep wake-up pressure value, the substep S1511 is executed, otherwise, the substep S1510 is executed again.
S1511, if the pressure value of the pipe network is judged to be equal to the dormancy awakening pressure value, the working frequency of the main pump motor is adjusted to the lower limit frequency value according to a preset main pump frequency increasing mode.
In this embodiment, when the pressure value of the pipe network is equal to the sleep wake-up pressure value, the main pump motor is waken up, the working frequency of the main pump motor is adjusted up to the lower limit frequency value, so as to increase the pressure value of the pipe network, and then the substep S1512 is performed.
S1512, judging whether the pipe network pressure value is equal to the target pressure value.
In the embodiment of the present invention, when the working frequency of the main pump motor is adjusted up through the sub-step S1511 to increase the pressure value of the pipe network, it is further determined whether the pressure value of the pipe network is equal to the target pressure value. If the pipe network pressure value is not equal to the target pressure value, executing step S1513, otherwise, returning to execute step S1509. In order to maintain the pipe network pressure value as the target pressure value, the energy consumption of the system is low, in this embodiment, when the pipe network pressure value is equal to the target pressure value, a reduction mode according to a preset main pump frequency is executed, the working frequency of the main pump motor is adjusted to zero, so that the main pump motor enters a sleep state, and the energy consumption of the whole system reaches a low level. And when the pressure value of the pipe network is reduced to the dormancy awakening pressure value due to the air leakage of the system, executing the step S1511 to awaken the main pump motor again so as to enable the pressure value of the pipe network to reach the target pressure value.
S1513, if the pipe network pressure value is judged not to be equal to the target pressure value, the working frequency of the main pump motor is adjusted upwards according to a preset main pump frequency increasing mode.
In this embodiment, when the pressure value of the pipe network is not equal to the target pressure value, that is, when the pressure value of the pipe network is smaller than the target pressure value, the operating frequency of the main pump motor is adjusted up to increase the pressure value of the pipe network, and then the substep S1512 is executed.
Referring to fig. 7, which is a schematic block diagram of a constant pressure water supply system according to an embodiment of the present invention. As shown in the figure, the constant-pressure water supply system 200 provided by the embodiment of the present invention includes a frequency converter 201, a main pump motor 202, and N auxiliary pump motors 203, wherein the frequency converter 201 is connected to the main pump motor 202 to control an operating frequency of the main pump motor 202, and the frequency converter 201 is connected to the N auxiliary pump motors 203 to control on and off of the N auxiliary pump motors 203, so as to implement any one of the constant-pressure water supply control methods. In some embodiments, such as the present embodiment, the number of auxiliary pump motors 203 is 2.
Referring to fig. 8, a logic timing diagram of a constant pressure water supply control method according to an embodiment of the present invention is shown. As shown in the drawing, in the present embodiment, 5 preset water supply demand values are provided, wherein the first level water supply demand value is 100%, the second level water supply demand value is 75%, the third level water supply demand value is 50%, the fourth level water supply demand value is 25%, and the fifth level water supply demand value is 0%.
If the water supply requirement value is detected to be equal to 100%, adjusting the operating frequency of the main pump motor to a maximum frequency value, and starting the auxiliary pump motor 1 after a first preset time interval because the pressure value of the pipe network does not reach a target pressure value, wherein the pressure value of the pipe network continues to rise, but still does not reach the target pressure value; the auxiliary pump motor 2 is started after a first preset time interval, and the pressure value of the pipe network continues to rise to reach a target pressure value. And the pressure value of the pipe network continues to rise, and the operating frequency of the main pump motor is adjusted downwards so that the pressure value of the pipe network is maintained at the target pressure value.
If the water supply demand value is detected to be equal to 75%, the pressure value of the pipe network is suddenly increased due to the fact that the water supply demand is reduced, the operating frequency of the main pump motor needs to be reduced to maintain the pressure constant, and the operating frequency of the main pump motor is adjusted downwards to enable the pressure value of the pipe network to be maintained at the target pressure value.
If the water supply demand value is detected to be equal to 50%, the pressure value of the pipe network is suddenly increased because the water supply demand is continuously reduced, and therefore the operating frequency of the main pump motor is required to be continuously reduced to maintain the pressure constant. The operating frequency of the main pump motor is adjusted downwards to a dormancy frequency value, and the operating frequency of the main pump motor is not further adjusted downwards to zero because the two auxiliary pump motors are both in an open state at the moment. When the demand is reduced, a pump reduction process is required. The auxiliary pump motor 1 is closed after a second preset time interval, and after the auxiliary pump motor 1 is closed, the operating frequency of the main pump motor is adjusted upwards to maintain constant pressure as the pressure value of the pipe network is reduced to be lower than a target pressure value.
If the water supply demand value is detected to be equal to 25%, the pressure value of the pipe network is suddenly increased due to the fact that the water supply demand is reduced again, and therefore the operating frequency of the main pump motor needs to be reduced to maintain the pressure constant. The operating frequency of the main pump motor is reduced to a sleep frequency value, because the auxiliary pump motor 2 is still in an on state at this time, the operating frequency of the main pump motor is not further reduced to zero. When the demand is reduced, a pump reduction process is required. The auxiliary pump motor 2 is closed after a second preset time interval, and after the auxiliary pump motor 2 is closed, the operating frequency of the main pump motor is adjusted upwards to maintain constant pressure as the pressure value of the pipe network is reduced to be lower than the target pressure value.
If the water supply demand value is detected to be equal to 0%, the pressure value of the pipe network is suddenly increased due to the reduction of the water supply demand, and therefore the operating frequency of the main pump motor needs to be reduced to maintain the pressure constant. The running frequency of the main pump motor is reduced to a dormancy frequency value, and the running frequency of the main pump motor is reduced to zero and enters a dormancy state because the two auxiliary pump motors are both in an off state at the moment.
If the pressure value of the pipe network is detected to reach the dormancy awakening pressure value, adjusting the operating frequency of the main pump motor to a lower limit frequency value, so that the pressure value of the pipe network still does not reach the target pressure value, and further adjusting the working frequency of the main pump motor to enable the pressure value of the pipe network to be equal to the target pressure value. And if the pressure value of the pipe network reaches the target pressure value, the main pump motor enters the dormant state again, namely the running frequency of the main pump motor is reduced to zero.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The utility model provides a constant voltage water supply control method, is applied to in the converter in order to control 1 main pump motor and N auxiliary pump motor, its characterized in that includes:
initializing parameters, wherein the parameter initialization comprises initializing a pressure set value, a frequency set value and M preset water supply demand values, the pressure set value comprises a target pressure value and a dormancy awakening pressure value, and the frequency set value comprises a maximum frequency value, a dormancy frequency value and a lower limit frequency value;
if the water supply requirement value is increased, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value;
if the water supply requirement value is judged to be reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value;
if the water supply requirement value is judged to be reduced, adjusting the working frequency of the main pump motor and the N auxiliary pump motors according to a second preset adjustment mode so as to enable the pressure value of the pipe network to reach the target pressure value, wherein the method comprises the following steps:
judging whether the working frequency of the main pump motor is equal to the dormancy frequency value or not;
if the working frequency of the main pump motor is judged not to be equal to the dormancy frequency value, the working frequency of the main pump motor is adjusted downwards according to a preset main pump frequency reduction mode;
if the pipe network pressure value is judged not to be equal to the target pressure value, returning to the step of judging whether the working frequency of the main pump motor is equal to the dormancy frequency value or not;
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, one of the N auxiliary pump motors is turned off according to a preset auxiliary pump turn-off mode;
if the pressure value of the pipe network is not larger than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value or not;
if the pipe network pressure value is judged not to be equal to the target pressure value, adjusting the working frequency of a main pump motor according to a preset main pump frequency increasing mode, and returning to the step of judging whether the pipe network pressure value is equal to the target pressure value or not;
if the pipe network pressure value is equal to the target pressure value, judging whether all the N auxiliary pump motors are closed;
if the N auxiliary pump motors are all turned off, judging whether the working frequency of the main pump motor is equal to the dormancy frequency value;
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, the working frequency of the main pump motor is adjusted to be zero according to a preset main pump frequency reduction mode;
judging whether the pressure value of the pipe network is equal to the dormancy awakening pressure value or not;
if the pipe network pressure value is equal to the dormancy awakening pressure value, adjusting the working frequency of the main pump motor to the lower limit frequency value according to a preset main pump frequency increasing mode;
judging whether the pressure value of the pipe network is equal to the target pressure value or not;
if the pipe network pressure value is judged not to be equal to the target pressure value, adjusting the working frequency of a main pump motor according to a preset main pump frequency increasing mode, and returning to the step of judging whether the pipe network pressure value is equal to the target pressure value or not;
and if the pipe network pressure value is judged to be equal to the target pressure value, returning to the step of reducing the working frequency of the main pump motor to zero according to a preset main pump frequency reduction mode.
2. The constant-pressure water supply control method according to claim 1, wherein the adjusting the operating frequency of the main pump motor and the N auxiliary pump motors according to a first preset adjustment mode to make the pipe network pressure value reach the target pressure value comprises:
judging whether the working frequency of the main pump motor is equal to the maximum frequency value or not;
if the working frequency of the main pump motor is judged not to be equal to the maximum frequency value, the working frequency of the main pump motor is adjusted upwards according to a preset main pump frequency increasing mode;
and if the pipe network pressure value is not equal to the target pressure value, returning to the step of judging whether the working frequency of the main pump motor is equal to the maximum frequency value.
3. The constant-pressure water supply control method according to claim 2, wherein after the judging whether the operating frequency of the main pump motor is equal to a maximum frequency value, the method further comprises:
if the working frequency of the main pump motor is judged to be equal to the maximum frequency value, one of the N auxiliary pump motors is started according to a preset auxiliary pump starting mode;
if the pressure value of the pipe network is judged to be not smaller than the target pressure value, judging whether the pressure value of the pipe network is equal to the target pressure value or not;
if the pipe network pressure value is judged not to be equal to the target pressure value, the working frequency of a main pump motor is adjusted downwards according to a preset main pump frequency reduction mode, and the step of judging whether the pipe network pressure value is equal to the target pressure value is returned;
and if the pressure value of the pipe network is judged to be smaller than the target pressure value, returning to the step of starting one of the N auxiliary pump motors according to a preset auxiliary pump starting mode.
4. The constant pressure water supply control method according to claim 3, wherein the turning on one of the N auxiliary pump motors according to a preset auxiliary pump on mode includes:
judging whether a first preset time interval is reached;
and if the first preset time interval is reached, starting one of the N auxiliary pump motors in a closed state.
5. The constant pressure water supply control method as claimed in claim 1, wherein the turning off one of the N auxiliary pump motors according to a preset auxiliary pump off mode comprises:
judging whether a second preset time interval is reached;
and if the second preset time interval is reached, turning off one of the N auxiliary pump motors in the starting state.
6. The constant-pressure water supply control method as claimed in claim 1, wherein the down-regulating the operating frequency value of the main pump motor to zero according to a preset main pump frequency reduction mode if it is determined that the operating frequency of the main pump motor is equal to the resting frequency value comprises:
if the working frequency of the main pump motor is judged to be equal to the dormancy frequency value, judging whether the preset delay time is reached;
and if the preset delay time is reached, the working frequency of the main pump motor is adjusted to zero.
7. A constant pressure water supply control system comprising a frequency converter, a main pump motor, and N auxiliary pump motors, wherein the frequency converter is connected to the main pump motor to control an operation frequency of the main pump motor, and the frequency converter is connected to the N auxiliary pump motors to control on and off of the N auxiliary pump motors, so as to perform the constant pressure water supply control method according to any one of claims 1 to 6.
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| CN201910040624.9A CN109853674B (en) | 2019-01-16 | 2019-01-16 | Constant-pressure water supply control method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RO117270B1 (en) * | 1999-06-02 | 2001-12-28 | Constantin Dan Dorin Staicu | Water supply installation |
| CN102465547A (en) * | 2010-11-09 | 2012-05-23 | 重庆成峰二次供水设备有限责任公司 | Control system of one-frequency one-pump constant pressure water supply equipment |
| CN104074239A (en) * | 2014-07-02 | 2014-10-01 | 合肥迈特机械科技有限公司 | Full-automatic variable-frequency constant-pressure water supply system and control method thereof |
| CN104196088A (en) * | 2014-09-09 | 2014-12-10 | 江南大学 | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof |
| CN105714879B (en) * | 2016-01-27 | 2018-06-15 | 连云港清源科技有限公司 | A kind of M drags the control method of the frequency-conversion control cabinet in N-type Intelligent constant-voltage water system |
| CN205688493U (en) * | 2016-06-15 | 2016-11-16 | 湖南科技学院 | A kind of constant pressure water supply control system based on PLC |
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