CN112526868A - Control method of secondary pressurization domestic water supply system - Google Patents
Control method of secondary pressurization domestic water supply system Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 322
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001276 controlling effect Effects 0.000 claims abstract description 17
- 239000008399 tap water Substances 0.000 claims abstract description 16
- 235000020679 tap water Nutrition 0.000 claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000004880 explosion Methods 0.000 claims abstract description 10
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- 238000001514 detection method Methods 0.000 claims description 9
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- 230000004069 differentiation Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 5
- 230000007958 sleep Effects 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000004622 sleep time Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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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
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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Abstract
A control method of secondary pressurization living water supply system includes presetting working pressure according to water supply parameters, receiving real-time pressure signals of the water supply system transmitted by a pressure sensor, comparing the real-time pressure signals with the preset working pressure through PID regulation in a frequency converter, reducing or increasing the number of water pumps put into operation when the flow of a water inlet pipe network changes, and regulating the rotating speed of the water pumps to enable the water supply system to achieve target operation effect; the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the steady flow compensator and the tap water inlet pressure are stabilized by controlling the vacuum suppressor, so that negative pressure is not generated to ensure normal water supply of a water supply system. And configuring a control system for the water supply system, wherein the control system comprises corresponding induction control of a water supply assembly, water shortage protection in water supply operation, high-temperature and overpressure protection in water supply operation, water supply fault analysis, water supply circuit protection and water supply end pipe explosion and pressure loss protection. The invention greatly improves the working efficiency, has strong reliability and saves the running power consumption of the equipment.
Description
Technical Field
The invention relates to the technical field of variable-frequency constant-pressure water supply control, in particular to a control method of a secondary pressurization domestic water supply system.
Background
With the rapid development of urbanization in China, at present, the building life water supply system adopts a frequency-conversion constant-pressure water supply mode at most, but the traditional secondary water supply pressurization system does not consider the difference of the water head loss of a pipe network during large flow and small flow, so that the energy waste during small flow water supply is large.
At this stage, the control of the water supply system may be divided into PLC control, integrated control and differential pressure control. Many domestic manufacturers adopt a PLC control mode, and the PLC control mode is stable, but the maintenance is very troublesome when problems occur; the integration control has higher integration level, basically all required functions are contained in the integrated control, and the integrated control is relatively simple to maintain; the third is to use mechanical principle, and to stop automatically when the pressure reaches the upper limit and start automatically when the pressure drops to the lower limit, which is generally used as a backup controllable mode.
How to control a water supply system on the premise of considering the difference of the water head loss of a pipe network when the water supply system has large flow and small flow is an urgent technical problem to be solved.
Disclosure of Invention
Therefore, the invention provides a control method of a secondary pressurized domestic water supply system, which is used for controlling water supply based on the difference of the water head loss of a pipe network when the water supply system has large flow and small flow, so that the requirements of safe and reliable water supply of the water supply system are met, and the better energy-saving and protection effects of the water supply system are achieved.
In order to achieve the above purpose, the invention provides the following technical scheme: a control method of a secondary pressurization domestic water supply system comprises the following steps:
before the water supply system is put into operation, firstly presetting working pressure according to water supply parameters, receiving a real-time pressure signal of the water supply system transmitted by a pressure sensor, comparing the real-time pressure signal with the preset working pressure through PID (proportion integration differentiation) regulation in a frequency converter, reducing or increasing the number of water pumps put into operation when the flow of a water inlet pipe network changes, and regulating the rotating speed of the water pumps to ensure that the water supply system achieves the target operation effect;
when the pressure of a water outlet of the water supply system is lower than the water using pressure required by a user, adjusting the actual pressure of a main water inlet pipeline of the water supply system to be consistent with the required pressure through a variable frequency pump, and controlling the variable frequency pump to operate according to a preset constant rotating speed;
when the outlet pressure of the water supply system exceeds the preset working pressure, reducing the rotating speed of the variable frequency pump, and when the outlet pressure of the water supply system is lower than the preset working pressure, increasing the rotating speed of the variable frequency pump; when the pressure of the tap water is equal to the pressure required by a user, stopping the work of the variable frequency pump;
the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the pressure of the steady flow compensator and the pressure of the water inlet of tap water are stabilized by controlling the vacuum suppressor, so that the steady flow compensator and the water inlet of the tap water do not generate negative pressure to ensure the normal water supply of the water supply system.
The control system comprises corresponding induction control of a water supply assembly, water supply running water shortage protection, water supply running high-temperature overpressure protection, water supply fault analysis, water supply circuit protection and water supply end pipe explosion pressure loss protection.
As the preferable scheme of the control method of the secondary pressurization domestic water supply system, after the control system is started to operate, the operation frequency of the variable frequency pump is adjusted according to the set value of the pressure of the single area; the control system samples and analyzes the user end pressure and flow demand.
As a preferred scheme of the control method of the secondary pressurization domestic water supply system, when a single water pump cannot meet water supply conditions through the operation of the control system, and the operation frequency of a frequency converter of the variable frequency pump exceeds 49.5HZ, the variable frequency pump is operated in a delayed mode according to preset delay time, when the delay time is exceeded, a command for starting a second group of pumps to add operation is given through the control system, and when one operation frequency is lower than the preset value, the pumps are reduced to operate; when the adding operation frequency of the second group of pumps reaches over 49.5HZ and the operation of the water supply system exceeds a set value, the control system starts protection according to a preset pipe explosion default value and stops the operation of the water supply system.
As an optimal scheme of the control method of the secondary pressurization domestic water supply system, when the water supply system needs to be started, whether the pipe network at the water outlet end of the water supply system is subjected to pipe explosion and pressure loss is checked, if no abnormity exists, the pipe explosion and pressure loss protection setting content is modified, the water supply system is started again after the modification is completed, the operation condition of the water supply system is checked, and the response feedback of the control system is observed.
As the preferable scheme of the control method of the secondary pressurization domestic water supply system, the water supply operation water shortage protection comprises water inlet end water shortage and pressure loss protection and system internal resistance value water shortage protection.
As the preferred scheme of the control method of the secondary pressurization domestic water supply system, the water-shortage and pressure-loss protection of the water inlet end is realized by installing a pressure detection device at the water inlet port and setting a minimum protection value, and when the water source entering the water guide pipe is lower than the minimum protection value, the control system starts protection;
the protection of the internal resistance value of the system is internal liquid level detection, the resistance value is a water shortage judgment coefficient, when water shortage is found through analysis, the control system starts the water shortage protection automatic stop, and when the detection value is not changed, the control system is limited to restart the operation of the water supply system.
As a preferred scheme of the control method of the secondary pressurization domestic water supply system, when the water supply system runs and the variable quantity of water used at a user demand end is reduced, and the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the working pressure of water supply exceeds the set pressure protection value, and the control system runs for high-temperature overpressure protection and automatic shutdown;
when the water supply system operates, when the variable of water consumption at a user demand end is reduced, the water supply system is blocked when water outlet appears within preset time, and when the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the working pressure tank body of the water supply system has a high-temperature phenomenon and exceeds a set high-temperature protection value, and the system is controlled to operate, so that the high-temperature overpressure protection automatic shutdown is realized.
As a preferable scheme of the control method of the secondary pressurization domestic water supply system, when the water supply system has a fault, the control system analyzes and retains the data of the fault analysis of the water supply system, and the fault type of the water supply system is judged according to the fault code.
The invention has the following advantages: before the water supply system is put into operation, firstly presetting working pressure according to water supply parameters, receiving a real-time pressure signal of the water supply system transmitted by a pressure sensor, comparing the real-time pressure signal with the preset working pressure through PID (proportion integration differentiation) regulation in a frequency converter, reducing or increasing the number of water pumps put into operation when the flow of a water inlet pipe network is changed, and regulating the rotating speed of the water pumps to ensure that the water supply system achieves the target operation effect; when the pressure of the water outlet of the water supply system is lower than the water use pressure required by a user, adjusting the actual pressure of a main water inlet pipeline of the water supply system to be consistent with the required pressure through a variable frequency pump, and controlling the variable frequency pump to operate according to a preset constant rotating speed; when the outlet pressure of the water supply system exceeds the preset working pressure, reducing the rotating speed of the variable frequency pump, and when the outlet pressure of the water supply system is lower than the preset working pressure, increasing the rotating speed of the variable frequency pump; when the pressure of the tap water is equal to the pressure required by a user, stopping the work of the variable frequency pump; the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the pressure of the steady flow compensator and the pressure of the water inlet of the tap water are stabilized by controlling the vacuum suppressor, so that the steady flow compensator and the water inlet of the tap water do not generate negative pressure to ensure the normal water supply of the water supply system. And configuring a control system for the water supply system, wherein the control system comprises corresponding induction control of a water supply assembly, water shortage protection in water supply operation, high-temperature and overpressure protection in water supply operation, water supply fault analysis, water supply circuit protection and water supply end pipe explosion and pressure loss protection. The invention greatly improves the working efficiency, has strong reliability, adopts the combination of voltage stabilization energy storage and frequency conversion speed regulation technology, and has double energy-saving of automatic speed regulation; the operating efficiency of the water pump is measured and calculated according to the operating parameters of the water pump and the motor, and a scientific basis is provided for the maintenance of the water pump; the system is efficient and energy-saving, and reasonably dispatches the water pump to operate so as to save the power consumption of equipment operation. The invention not only meets the requirement of safe and reliable water supply of the system, but also achieves better and safe energy-saving effect of the system.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
FIG. 1 is a schematic diagram of a method for controlling a secondary pressurized domestic water supply system according to an embodiment of the present invention;
FIG. 2 is a first display interface of a control system based on a control method of a secondary pressurized domestic water supply system according to an embodiment of the present invention;
FIG. 3 is a second display interface of the control system based on the control method of the secondary pressurized domestic water supply system according to the embodiment of the present invention;
FIG. 4 is a third display interface of the control system based on the control method of the secondary pressurized domestic water supply system according to the embodiment of the present invention;
FIG. 5 is a fourth display interface of the control system based on the control method of the secondary pressurized domestic water supply system according to the embodiment of the present invention;
fig. 6 is a display interface five of the control system based on the control method of the secondary pressurized domestic water supply system according to the embodiment of the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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, there is provided a method for controlling a secondary pressurized domestic water supply system, comprising the steps of:
s1: before the water supply system is put into operation, firstly presetting working pressure according to water supply parameters, receiving a real-time pressure signal of the water supply system transmitted by a pressure sensor, comparing the real-time pressure signal with the preset working pressure through PID (proportion integration differentiation) regulation in a frequency converter, reducing or increasing the number of water pumps put into operation when the flow of a water inlet pipe network changes, and regulating the rotating speed of the water pumps to ensure that the water supply system achieves the target operation effect;
s2: when the pressure of a water outlet of the water supply system is lower than the water using pressure required by a user, adjusting the actual pressure of a main water inlet pipeline of the water supply system to be consistent with the required pressure through a variable frequency pump, and controlling the variable frequency pump to operate according to a preset constant rotating speed;
s3: when the outlet pressure of the water supply system exceeds the preset working pressure, reducing the rotating speed of the variable frequency pump, and when the outlet pressure of the water supply system is lower than the preset working pressure, increasing the rotating speed of the variable frequency pump; when the pressure of the tap water is equal to the pressure required by a user, stopping the work of the variable frequency pump;
s4: the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the pressure of the steady flow compensator and the pressure of the water inlet of tap water are stabilized by controlling the vacuum suppressor, so that the steady flow compensator and the water inlet of the tap water do not generate negative pressure to ensure the normal water supply of the water supply system.
Specifically, the water supply system is configured with a control system, and the control system comprises corresponding induction control of a water supply assembly, water shortage protection in water supply operation, high-temperature and overpressure protection in water supply operation, water supply fault analysis, water supply circuit protection and water supply end pipe explosion pressure loss protection.
Referring to fig. 2, the interface i displays the main information of constant pressure water supply including set pressure, feedback pressure, frequency conversion operation frequency, operation state of the pump set, and entry parameter, time, and alarm parameter interface.
Referring to fig. 3, the pressure of the pump is set in the interface two, the number of sets of the pump is selected, the pressure is set according to the time-sharing partial pressure and the keyboard pressure, the time-sharing partial pressure is set according to different time periods, and the keyboard pressure is set according to the keyboard. The water supply system is a three-main-pump one-auxiliary pump, the pump set is effective when a green light is selected, and is shielded for use when a red light is selected. When the sleep permission switch is turned on to emit green light, the sleep is performed according to the set parameters, and when the sleep permission switch is turned on to emit red light, the equipment is not in sleep. When the pump-adding permission switch is a green light, and when the set parameter operation pressure of a group of pumps is insufficient, the water supply system is added with a power frequency pump for operation. Two groups of pumps are selected and the time for switching the pumps is up to automatically switch to another pump for operation.
Referring to fig. 4, parameters of pump adding, sleep, PID and sleep time periods during operation are set in the interface three, when the pump adding permission switch is effective, when the actual pressure is lower than the pump adding pressure and the actual frequency is higher than the pump adding frequency, and the delay time of the pump adding is up for the two pieces, the control system increases a group of pump operating frequency for operation, when the actual pressure is higher than the pump reducing pressure and the actual frequency is lower than the pump reducing frequency, and when the delay time of the pump reducing is up for the two conditions, the control system reduces the operating frequency of the pump. When the sleep permission switch is effective, one group of pumps operates, and when the actual pressure is higher than the sleep pressure and the actual frequency is lower than the sleep frequency, and the sleep delay time of the two conditions is up, the control system suspends the operation. And when the actual pressure is lower than the awakening pressure and the dormancy delay time is up, the control system resumes operation. The device sleep period has two periods during which the control system does sleep.
Referring to fig. 5, the control system time is set on the interface four, the buttons are set according to the time after the first row of time is set, and the second row is the current time of the control system equipment.
Referring to fig. 6, the alarm type, the alarm event, the current value of the operation parameter of the water supply equipment, the threshold value and the alarm description are displayed in the interface five, so that the alarm time and the specific alarm information can be observed and processed conveniently.
Specifically, after the control system is started to operate, the operating frequency of the variable frequency pump is adjusted according to a set value of the pressure of the single area; the control system samples and analyzes the user end pressure and flow demand. After the control system is started to operate, the comprehensive control function of the control system is embodied as follows: the control system adjusts the running frequency of the frequency converter according to the single-zone pressure set value to meet the necessary regulation of the running of the water supply end, the auxiliary function of the control system is embodied in automatic sampling of the system, the pressure and flow requirements of the user end are automatically analyzed, the running frequency of the frequency converter is timely adjusted while the requirement of the water supply flow is met, the optimal running working condition is achieved, efficient running is guaranteed, and the energy-saving effect is achieved.
Specifically, when a single water pump cannot meet the water supply condition through the control system, the frequency converter of the variable frequency pump runs at a frequency exceeding 49.5HZ, the variable frequency pump is delayed to run according to preset delay time, when the delay time is exceeded, a second group of pump adding running instructions are given out through the control system, and when one running frequency is lower than the preset value, pump reducing running is carried out; when the adding operation frequency of the second group of pumps reaches over 49.5HZ and the operation of the water supply system exceeds a set value, the set value is preferably 30 minutes, the control system starts protection according to a preset pipe explosion default value, and the water supply system stops operation.
When the water supply system needs to be started, whether the pipe network at the water outlet end of the water supply system is burst and depressurized or not is checked, if no abnormity exists, the content of burst and depressurization protection setting is modified, the water supply system is started again to operate after the modification is completed, the operation condition of the water supply system is checked, and the response feedback of the control system is observed.
Specifically, the water supply operation water shortage protection comprises water inlet end water shortage voltage loss protection and system internal resistance value water shortage protection. The water-shortage and pressure-loss protection of the water inlet end is realized by installing a pressure detection device at the water inlet port and setting a minimum protection value, and when the water source entering the water guide pipe is lower than the minimum protection value, the control system starts protection; the protection of the internal resistance value of the system is internal liquid level detection, the resistance value is a water shortage judgment coefficient, when water shortage is found through analysis, the control system starts the water shortage protection automatic stop, and when the detection value is not changed, the control system is limited to restart the operation of the water supply system.
Specifically, when the water supply system runs, when the variable of water consumption at a user demand end is reduced, and the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the water supply working pressure exceeds the set pressure protection value, and the system is controlled to run for high-temperature overpressure protection and automatic shutdown;
when the water supply system operates, when the variable of water consumption at a user demand end is reduced, the water supply system is blocked when water outlet appears within preset time, and when the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the working pressure tank body of the water supply system has a high-temperature phenomenon and exceeds a set high-temperature protection value, and the system is controlled to operate, so that the high-temperature overpressure protection automatic shutdown is realized.
Specifically, when the water supply system has a fault, the control system analyzes and retains the data of the fault analysis of the water supply system, and the fault type of the water supply system is judged according to the fault code.
According to the control system of the secondary pressurized water supply device, before normal operation of equipment, parameters such as pressure, the number of water pumps, an integral coefficient and operation time of the system are set under the condition of no load, after the system parameters are set, a power supply is turned off, a motor pump is connected into a control cabinet, then the power supply is switched on, the operation mode is selected to be automatic operation, and the system can operate according to the set parameters. The system can also be switched into a manual operation mode, and under the manual operation mode, any water pump can be directly started through an operation button on a control cabinet panel.
Before the water supply system normally operates, as shown in fig. 2, parameters such as the operating pressure, the number of water pumps, an integral coefficient, the operating time and the like of the water supply system are firstly set under the condition of no load, after the parameters of the control system are set, a power supply is turned off, a motor pump is connected into a control cabinet, then the power supply is switched on, the operating mode is selected to be automatic operation, and the control system can operate according to the set parameters. The control system can also be switched into a manual operation mode, and under the manual operation mode, any water pump can be directly started through an operation button on a control cabinet panel.
When a control system operates a single water pump and can not meet the water supply condition, the operating frequency of a frequency converter can reach over 49.5HZ, the system analyzes automatic delay operation, when the delay time is exceeded, the system sends an instruction and starts a second group of pumps to add operation, when the operating frequency of one pump is lower than a set value, the set value is generally 25-30HZ, and the system automatically reduces the number of pumps to operate; when the adding operation frequency of the second group of pumps reaches over 49.5HZ, the water supply system operates for more than 30 minutes, the control system can set starting protection according to the water supply system, set the pressure of the pumps, select the group number of the pumps, set the pressure with time-sharing partial pressure and keyboard given pressure, set the pressure in the time-sharing partial pressure in different time periods, and set the pressure with the keyboard given pressure. The equipment is three main pumps and one auxiliary pump, the pump set is effective when a green light is selected to be on, and the pump set is used for shielding when a red light is selected to be on. When the sleep permission switch is turned on to emit green light, the sleep is performed according to the set parameters, and when the sleep permission switch is turned on to emit red light, the equipment is not in sleep. When the pump adding permission switch is a green light, and when the operating pressure of a group of pumps is insufficient according to set parameters, the system adds a power frequency pump to operate. When two groups of pumps and more than two pumps are selected, the pumps can be automatically switched to operate by another pump when the time for switching the pumps is up.
When the equipment is in operation, working pressure is set on the touch screen according to water supply parameters, the control system receives real-time pressure signals transmitted by the pressure sensor and compares the real-time pressure signals with the set pressure through PID (proportion integration differentiation) regulation in the frequency converter, when the flow of a pipe network changes, the control system can automatically reduce or increase the number of running water pumps and regulate the rotating speed of the water pumps, so that the water supply system achieves the most reasonable and economic operation effect. Fig. 4 shows pump, sleep, PID and sleep period parameters for setting run time. When the system fails, as shown in fig. 6, the control system automatically analyzes, retains the data of the system failure analysis, and actively sends alarm information to the upper machine position and starts the self-protection function.
Before the water supply system is put into operation, the working pressure is preset according to water supply parameters, the real-time pressure signal of the water supply system transmitted by a pressure sensor is received, the PID regulation in a frequency converter is compared with the preset working pressure, when the flow of a water inlet pipe network is changed, the number of water pumps put into operation is reduced or increased, and the rotating speed of the water pumps is regulated, so that the water supply system achieves the target operation effect; when the pressure of the water outlet of the water supply system is lower than the water use pressure required by a user, adjusting the actual pressure of a main water inlet pipeline of the water supply system to be consistent with the required pressure through a variable frequency pump, and controlling the variable frequency pump to operate according to a preset constant rotating speed; when the outlet pressure of the water supply system exceeds the preset working pressure, reducing the rotating speed of the variable frequency pump, and when the outlet pressure of the water supply system is lower than the preset working pressure, increasing the rotating speed of the variable frequency pump; when the pressure of the tap water is equal to the pressure required by a user, stopping the work of the variable frequency pump; the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the pressure of the steady flow compensator and the pressure of the water inlet of the tap water are stabilized by controlling the vacuum suppressor, so that the steady flow compensator and the water inlet of the tap water do not generate negative pressure to ensure the normal water supply of the water supply system. And configuring a control system for the water supply system, wherein the control system comprises corresponding induction control of a water supply assembly, water shortage protection in water supply operation, high-temperature and overpressure protection in water supply operation, water supply fault analysis, water supply circuit protection and water supply end pipe explosion and pressure loss protection. The invention greatly improves the working efficiency, has strong reliability, adopts the combination of voltage stabilization energy storage and frequency conversion speed regulation technology, and has double energy-saving of automatic speed regulation; the operating efficiency of the water pump is measured and calculated according to the operating parameters of the water pump and the motor, and a scientific basis is provided for the maintenance of the water pump; high efficiency, energy saving, reasonable scheduling of water pump operation, and low operation cost. The invention not only meets the requirement of safe and reliable water supply of the system, but also achieves better and safe energy-saving effect of the system.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A control method of a secondary pressurization domestic water supply system is characterized by comprising the following steps:
before the water supply system is put into operation, firstly presetting working pressure according to water supply parameters, receiving a real-time pressure signal of the water supply system transmitted by a pressure sensor, comparing the real-time pressure signal with the preset working pressure through PID (proportion integration differentiation) regulation in a frequency converter, reducing or increasing the number of water pumps put into operation when the flow of a water inlet pipe network changes, and regulating the rotating speed of the water pumps to ensure that the water supply system achieves the target operation effect;
when the pressure of a water outlet of the water supply system is lower than the water using pressure required by a user, adjusting the actual pressure of a main water inlet pipeline of the water supply system to be consistent with the required pressure through a variable frequency pump, and controlling the variable frequency pump to operate according to a preset constant rotating speed;
when the outlet pressure of the water supply system exceeds the preset working pressure, reducing the rotating speed of the variable frequency pump, and when the outlet pressure of the water supply system is lower than the preset working pressure, increasing the rotating speed of the variable frequency pump; when the pressure of the tap water is equal to the pressure required by a user, stopping the work of the variable frequency pump;
the water inlet of the variable frequency pump is connected with the steady flow compensator, the pressure in the steady flow compensator is detected, and the pressure of the steady flow compensator and the pressure of the water inlet of tap water are stabilized by controlling the vacuum suppressor, so that the steady flow compensator and the water inlet of the tap water do not generate negative pressure to ensure the normal water supply of the water supply system.
2. The method as claimed in claim 1, wherein the water supply system is configured to include a corresponding sensing control of water supply components, a water shortage protection in water supply operation, a high temperature and overpressure protection in water supply operation, a water supply failure analysis, a water supply circuit protection and a water supply end pipe burst pressure loss protection.
3. The method as claimed in claim 2, wherein when the control system is started, the operation frequency of the variable frequency pump is adjusted according to the set pressure value of the single area; the control system samples and analyzes the user end pressure and flow demand.
4. The method according to claim 2, wherein when the single water pump cannot meet the water supply condition through the control system, and the frequency converter operating frequency of the variable frequency pump exceeds 49.5HZ, the variable frequency pump is operated in a delayed mode according to a preset delay time, when the delay time is exceeded, the control system gives an instruction for starting the second group of pumps to add operation, and when one operating frequency is lower than the preset value, the pump reduction operation is performed; when the adding operation frequency of the second group of pumps reaches over 49.5HZ and the operation of the water supply system exceeds a set value, the control system starts protection according to a preset pipe explosion default value and stops the operation of the water supply system.
5. The method for controlling a secondary pressurization domestic water supply system according to claim 4, wherein when the water supply system needs to be started, whether the pipe network at the water outlet end of the water supply system is burst and depressurized is checked, if no abnormality exists, the content of the burst and depressurization protection setting is modified, the water supply system is started again after the modification is completed, the operation condition of the water supply system is checked, and the response feedback of the control system is observed.
6. The method as claimed in claim 2, wherein the water supply operation water shortage protection comprises water inlet end water shortage voltage loss protection and system internal resistance value water shortage protection.
7. The method for controlling a secondary pressurized domestic water supply system according to claim 6, wherein the water inlet end water shortage and pressure loss protection is realized by installing a pressure detection device at the water inlet port and setting a minimum protection value, and when the water inlet pipe enters a water source and is lower than the minimum protection value, the control system starts protection;
the protection of the internal resistance value of the system is internal liquid level detection, the resistance value is a water shortage judgment coefficient, when water shortage is found through analysis, the control system starts the water shortage protection automatic stop, and when the detection value is not changed, the control system is limited to restart the operation of the water supply system.
8. The method for controlling a secondary pressurization domestic water supply system according to claim 2, wherein when the water supply system is running, the variable of water consumption at the user demand end is reduced, the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the water supply working pressure exceeds the set pressure protection value, and the system is controlled to run for high temperature and overpressure protection and automatically shut down;
when the water supply system operates, when the variable of water consumption at a user demand end is reduced, the water supply system is blocked when water outlet appears within preset time, and when the frequency converter of the variable frequency pump is not adjusted in time or the adjusting function is not complete, the working pressure tank body of the water supply system has a high-temperature phenomenon and exceeds a set high-temperature protection value, and the system is controlled to operate, so that the high-temperature overpressure protection automatic shutdown is realized.
9. The method as claimed in claim 2, wherein when the water supply system is out of order, the control system analyzes and retains data of the failure analysis of the water supply system, and determines the type of failure of the water supply system according to the failure code.
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