CN104532906A - Automatic water supply device and method - Google Patents
Automatic water supply device and method Download PDFInfo
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- CN104532906A CN104532906A CN201410718501.3A CN201410718501A CN104532906A CN 104532906 A CN104532906 A CN 104532906A CN 201410718501 A CN201410718501 A CN 201410718501A CN 104532906 A CN104532906 A CN 104532906A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses an automatic water supply device and method. The device comprises a controller, a pressure sensor in data connection with the controller and a water supply pump. Compared with the prior art, the automatic water supply device and method have the beneficial effects that the water supply amount can be automatically adjusted according to water supply requirements at the current time period; the water supply requirement can be met when the using amount of water resources is large; and meanwhile, the water resources are saved when the using amount of the water resources is small.
Description
Technical field
The present invention relates to automatic control technology field, more specifically, relate to a kind of automatic water supply device and method.
Background technology
Along with the progress of society, the living condition of people is become better and better, and the resource needed for resident's daily life all can obtain according to demand at any time, such as water resource.Based on this, need to carry out unified management to the supply of resource needed for daily life.
For water resource, usually, supplying water and to be undertaken by the pressure of water supply network, when water resource use amount is larger, in order to ensure the requirement of resident to water supply volume, needing larger water supply network pressure; Otherwise, when water resource use amount is less, water supply network pressure can be reduced.
But, according to the habits and customs of people, relatively large in the use amount of the meal time water resource of morning, noon and afternoon, and the use amount of other times water resource is relatively little.If water supply network pressure remains unchanged, when water resource use amount is larger, be easy to the situation producing insufficient water; When water resource use amount is less, relatively large water supply network pressure can cause again the waste of water resource.Therefore, the adjustment water supply network pressure how adapted according to the use amount of water resource is this area technical problem urgently to be resolved hurrily.
Summary of the invention
In view of this, embodiments provide a kind of automatic water supply device and method, the adjustment water supply network pressure that can adapt according to the use amount of water resource, can when water resource use amount be larger, meet the demand supplied water, simultaneously when water resource use amount is less, save water resource.
First aspect, embodiments provides a kind of automatic water supply device, comprising: controller, carry out pressure sensor and the supply-water pump of data cube computation with described controller; Wherein, described controller is provided with at least two pressure set points according to the period; Described pressure sensor is used for the current pressure values detecting water supply network in real time, and described current pressure values is sent to described controller; The pressure set points of described current pressure values and present period is carried out computing by described controller, and regulates the output of described supply-water pump according to operation result.
Preferably, described controller comprises PID PID adjustment module and variable frequency adjustment module; Described PID adjustment module, for the pressure set points of described current pressure values and described present period is carried out PID arithmetic, and regulates frequency-variable module according to operation result; Described frequency-variable module, for controlling the output of supply-water pump by the adjustment of operating frequency.
Preferably, described supply-water pump comprises the first supply-water pump and the second supply-water pump, and wherein, described frequency-variable module carries out variable frequency adjustment to described first supply-water pump or described second supply-water pump.
Preferably, also comprise the touch screen displays be connected with described controller data, described touch screen displays receives amendment information.
Preferably, also comprise the water tank be communicated with described supply-water pump by described water supply network, in described water tank, be provided with air bag.
Second aspect, the embodiment of the present invention additionally provides a kind of automatic water-supply method, comprising: the current pressure values being detected water supply network by pressure sensor; By controller, the pressure set points of described current pressure values and present period is carried out computing, wherein, described controller is provided with at least two pressure set points according to the period; The output of supply-water pump is regulated according to operation result.
Preferably, described controller regulates the output of supply-water pump according to operation result, comprise: when the output of described first supply-water pump reaches maximum value, when described current pressure values is less than the pressure set points of described present period, the output of described first supply-water pump is adjusted to specified output, regulates the output of the second supply-water pump; Or, when the output of described second supply-water pump reaches maximum value, when described current pressure values is less than the pressure set points of described present period, the output of described second supply-water pump is adjusted to specified output, regulates the output of described first supply-water pump.
Preferably, described controller regulates the output of supply-water pump according to operation result, comprise: when the output of described first supply-water pump reaches minimum value, when described current pressure values is greater than the pressure set points of described present period, cut off the water supply of described first supply-water pump, regulate the output of described second supply-water pump; Or, when the output of described second supply-water pump reaches minimum value, when described current pressure values is greater than the pressure set points of described present period, cut off the water supply of described second supply-water pump, regulate the output of described first supply-water pump.
Preferably, also comprise: receive amendment information by touch display screen; Amendment information is stored in the corresponding period as new pressure set points.
Preferably, also comprise: when the water in described water supply network flows out water tank, the air bag be arranged in described water tank is compressed; When the pressure of described air bag reaches peak, cut off described supply-water pump.
From above technical scheme, the automatic water supply device that the embodiment of the present invention provides and method, according to the period, at least two ductwork pressure setting values are set, pressure sensor detects the force value of current water supply network, and current pressure values is sent to controller, the pressure set points of current pressure values and present period is carried out computing by controller, and the output of the adjustment supply-water pump adapted according to operation result.When water demand amount is larger, the force value of setting is comparatively large, so that increase the output of supply-water pump; When water demand amount is less, the force value of setting is less, so that reduce the output of supply-water pump.Compared with prior art, automatically can adjust output according to the water supply requirement of present period, when water resource use amount is larger, the demand supplied water can not only be met, simultaneously when water resource use amount is less, save water resource.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.Shown in accompanying drawing, above-mentioned and other object of the present invention, Characteristics and advantages will be more clear.Reference numeral identical in whole accompanying drawing indicates identical part.Deliberately do not draw accompanying drawing by real size equal proportion convergent-divergent, focus on purport of the present invention is shown.
The structural representation of the automatic water supply device that Fig. 1 provides for the embodiment of the present invention;
The structural representation of the second embodiment of the automatic water supply device that Fig. 2 provides for the embodiment of the present invention;
The method flow diagram of the automatic water-supply method that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, carry out clear, complete description to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In order under different outputs requires, suitable output can either be provided, can not cause again the waste of water resource, embodiments provide a kind of automatic water supply device.Refer to Fig. 1, the structural representation of the automatic water supply device that Fig. 1 provides for the embodiment of the present invention, described equipment comprises: controller 1, pressure sensor 2 and supply-water pump 3.Wherein, controller 1 comprises PID (Proportion Integration Differentiation, PID) adjustment module and variable frequency adjustment module, and the period is provided with at least two pressure set points.Pressure sensor 2 detects the current pressure values of water supply network, and current pressure values is sent to controller 1, the pressure set points of current pressure values and present period is carried out PID arithmetic by the PID adjustment module of controller 1, and the operating frequency of frequency-variable module is regulated according to operation result, thus change the operating frequency of supply-water pump, regulate the output of supply-water pump.
It is pointed out that in the present embodiment, user can pass through PLC (Programmable Logic Controller, programmable logic controller (PLC)) carries out pressure set points setting according to the period, and can arrange at least two pressure set points.Certainly, above are only the preferred embodiment of the present invention, become any restriction not to technical scheme of the present invention, such as, user is in order to accurate setting, and the time of every day can be divided into six periods, each period correspondence arranges a pressure set points.
Known by foregoing description, the automatic water supply device that the present embodiment provides, controller 1 can adjust the output of supply-water pump 3 automatically according to the pressure set points of each period, can meet the demand of user with assure feed water amount.
In order to enable the technical scheme of those skilled in the art's clearly embodiment of the present invention, the embodiment of the present invention is described in detail by the technical scheme of following description to the embodiment of the present invention.Refer to Fig. 2, Fig. 2 shows the structural representation of the second embodiment of the automatic water supply device that the embodiment of the present invention provides.
Because supply-water pump is provided with running higher limit and lower limit, regulate output to be subject to supply-water pump running restriction by means of only a supply-water pump, output requirement cannot be reached, if make supply-water pump overload operation by force, be easy to cause supply-water pump to be damaged.In order to solve the problems of the technologies described above, in the present embodiment, supply-water pump 3 comprises the first supply-water pump 31 and the second supply-water pump 32.
The frequency-variable module of controller 1, when regulating the output of supply-water pump, first, carries out variable frequency adjustment to one of them supply-water pump, when regulated supply-water pump reaches the peak value of running, when still cannot meet water requirements, then carries out variable frequency adjustment to another supply-water pump.Thus avoid the situation that a supply-water pump cannot satisfy the demands, and the application life of supply-water pump can be extended.Certainly, the present embodiment is only a preferred exemplary, is not construed as limiting technical scheme of the present invention, and the embodiment of the present invention can also arrange multiple supply-water pump.
It should be noted that, even if not identical according to the output of different identical period in season yet, such as: selecting 9 morning 7 in winter, to select be only the time that resident prepares breakfast, output can meet resident and prepare breakfast, and 7 o'clock to 9 o'clock morning of summer, resident not only will prepare breakfast but also need to take a shower, and considerably increases water supply volume.Therefore, the water supply volume in 7 o'clock to 9 o'clock summer is far longer than winter, needs, again by PLC programming amendment pressure set points, to use very inconvenient.For this reason, the present embodiment is also provided with touch screen displays 4.Touch screen displays 4 can not only show the pressure set points corresponding to each period, and the function that can be inputted by touch-control revises pressure set points at any time, and equipment need not be programmed by Multiple through then out PLC, flexible and convenient to use.
In addition, PID regulates exists certain regulating time usually, when water demand amount from large to small time, PID adjustment module needs certain hour the output of supply-water pump could be reduced, and the pressure of water supply network during this period of time can increase, and causes the waste of water resource.And during evening, water demand amount is almost nil, but resident still has a small amount of demand supplied water, and now, regulates, not only need certain regulating time, but also need to start a lot of relevant device, cause the wasting of resources if start PID adjustment module.
Based on the problems referred to above, in the present embodiment, be also provided with water tank 5, in water tank 5, be provided with air bag, and be communicated with supply-water pump 3 by water supply network.When output is by switch to greatly hour, in the regulating time of PID adjustment module, the water yield had more in water supply network flows in water tank by the pressure of water supply network, the current pressure values of water supply network can not only be reduced like this, accelerate adjustment process, and can storage area water resource, so that when water requirements is very little, water resource is provided, and does not trigger the startup of other supply equipments.
Comprehensively above-mentioned, the automatic water supply device that the embodiment of the present invention provides, according to the period, at least two ductwork pressure setting values are set, pressure sensor detects the force value of current water supply network, and current pressure values is sent to controller, the pressure set points of current pressure values and present period is carried out computing by controller, and the output of the adjustment supply-water pump adapted according to operation result.When water demand amount is larger, the force value of setting is comparatively large, so that increase the output of supply-water pump; When water demand amount is less, the force value of setting is less, so that reduce the output of supply-water pump.Compared with prior art, automatically can adjust output according to the water supply requirement of present period, when water resource use amount is larger, the demand supplied water can not only be met, simultaneously when water resource use amount is less, save water resource.
Corresponding with the said equipment, the embodiment of the present invention additionally provides a kind of automatic water-supply method.As shown in Figure 3, Fig. 3 shows the method flow diagram of the automatic water-supply method that the embodiment of the present invention provides, and said method comprising the steps of:
Step S101: the current pressure values being detected water supply network by pressure sensor.
Wherein, there is certain functional relation in the force value of output and water supply network, and therefore, user can detect current output by the force value obtaining water supply network.In the present embodiment, user can be based on experience value, the pressure set points of water supply network is pre-set by PLC programming, pressure sensor is utilized to detect the current pressure values of water supply network, and current pressure values is sent to controller, so that controller regulates according to the current output of current pressure values, make current pressure values close to pressure set points.
Step S102: the pressure set points of current pressure values and present period is carried out computing by controller.
Wherein, controller comprises PID adjustment module and frequency-variable module, PID adjustment module receives the current pressure values that pressure sensor sends, and current pressure values and pressure set points is carried out PID arithmetic, so that determine whether to increase/to reduce output according to operation result.
It should be noted that, owing to being previously provided with at least two pressure set points, and multiple pressure set points set according to the period, therefore, PID adjustment module needs every predetermined time to obtain new pressure set points, this new pressure set points is to obtain the moment for initial time, until the next acquisition moment.Due to when programming, the pressure set points arranged according to the period, therefore, the predetermined time described in the present embodiment is the initial time of each period.
In addition, seen from the above description, even if the output of identical period Various Seasonal is not identical yet, therefore, pressure set points needs often amendment, and initial pressure set points is by PLC programming realization.We know, not only program is loaded down with trivial details for PLC programming amendment pressure set points, and need certain professional, therefore, the embodiment of the present invention is in order to easy and simple to handle, receive amendment information by touch display, and amendment information is stored in the corresponding period as new pressure set points, former pressure set points is covered.
Step S103: the output regulating supply-water pump according to operation result.
Wherein, the operation result that PID adjustment module carries out PID arithmetic according to current pressure values and pressure set points is the foundation adjusting output, if current pressure values is less than pressure set points, then increases output; If current pressure values is greater than pressure set points, then reduce output.Wherein, controller regulates the size of the rotational speed regulation output of supply-water pump by frequency-variable module.
Concrete, because the embodiment of the present invention can be provided with multiple supply-water pump, and when regulating multiple supply-water pump, disturbing factor is more simultaneously, cannot ensure the accuracy regulated, be easy to cause regulating time long, affect normal water supply.Therefore, the output first for a supply-water pump regulates, when this supply-water pump reach running peak value still can not meet the water requirements of present period time, more next supply-water pump to be regulated, until meet the water supply requirement of present period.
The present embodiment, for two supply-water pumps, is described in detail for Water flow-path to concrete.When the period of supplying water enters the high demand period from the low demand period, the pressure set points of this period is larger than a upper period, and therefore, the operation result according to PID adjustment module should increase output.Supposed that a upper period finally carried out variable frequency adjustment to the first water supply network, then the output still maintaining the second supply-water pump in this period with on the output of a period final stage identical, regulated by the operating frequency of frequency-variable module to the first supply-water pump.If before the operating frequency of the first supply-water pump reaches peak-peak, the force value of water supply network be stabilized in the pressure set points of this period upper and lower time, the operating frequency position of the first supply-water pump on that frequency under.If the operating frequency of the first supply-water pump reaches the highest, and the force value of water supply network is when being still less than setting value, first supply-water pump is maintained power frequency running, and variable frequency adjustment is started to the second supply-water pump, until the pressure set points that the current pressure values of water supply network is stabilized in this period is upper and lower.
Certainly, if the final moment of a upper period carries out variable frequency adjustment to the second supply-water pump, then still maintained the frequency of the first supply-water pump in this period constant, variable frequency adjustment is carried out to the second supply-water pump.When the operating frequency of the second supply-water pump reaches the highest, and the force value of water supply network is when being still less than the pressure set points of this period, second supply-water pump is maintained power frequency running, and start variable frequency adjustment to the first supply-water pump, until the pressure set points that the current pressure values of water supply network is stabilized in this period is upper and lower.
When the period of supplying water enters the low demand period by the high demand period, the pressure set points due to this period was less than a upper period, therefore, needed the force value reducing current water supply network.Supposed that a upper period finally carried out variable frequency adjustment to the first water supply network, then the output still maintaining the second supply-water pump in this period with on the output of a period final stage identical, regulated by the operating frequency of frequency-variable module to the first supply-water pump.If before the operating frequency of the first supply-water pump is reduced to minimum peak, the force value of water supply network be stabilized in the pressure set points of this period upper and lower time, the operating frequency position of the first supply-water pump on that frequency under.If the operating frequency of the first supply-water pump is reduced to minimum, and the force value of water supply network is when being still greater than setting value, cut off the first supply-water pump, supplied water separately by the second supply-water pump, and start variable frequency adjustment to the second supply-water pump, until the pressure set points that the current pressure values of water supply network is stabilized in this period is upper and lower.
Certainly, if the final moment of a upper period carries out variable frequency adjustment to the second supply-water pump, then still maintained the frequency of the first supply-water pump in this period constant, variable frequency adjustment is carried out to the second supply-water pump.When the operating frequency of the second supply-water pump is reduced to minimum, and the force value of water supply network is when being still greater than the pressure set points of this period, cut off the second supply-water pump, supplied water separately by the first supply-water pump, and start variable frequency adjustment to the first supply-water pump, until the pressure set points that the current pressure values of water supply network is stabilized in this period is upper and lower.
It is pointed out that above-mentioned is control method to the supply equipment being provided with two supply-water pumps, technical solution of the present invention can also be provided with more supply-water pump according to demand, and the present invention does not limit this.When being provided with multiple supply-water pump, its regulative mode is similar to the aforementioned embodiment, and the present invention repeats no more herein.
Seen from the above description, when being supplied water by multiple supply-water pump, can break through the restriction of a supply-water pump operating condition, the adjusting range making output is larger, and each supply-water pump can not running at full capacity, damages also less to equipment itself.
In addition, when water requirements is very little, the such as late into the night, if supply-water pump remains in operation can cause much unnecessary consumption, but if do not operated, need when there being urbanite water consumption once in a while immediately to provide water supply, therefore, in the embodiment of the present invention, water supply network is also connected with water tank.From the description of above-described embodiment, the inside of water tank is provided with air bag, and when water tank carries out water storage, the gas in air bag is extruded by water, when the air pressure in air bag reaches peak value, stops water storage.When urbanite water consumption, because one end of water supply network is opened, the water in the air pressure extruding water tank in air bag, thus water is discharged, use water for resident provides.
The method of supplying water of water tank in the present embodiment, can be very little in water requirements, to such an extent as to when need not start supply-water pump water supply, in time for resident provides enough use water, when not affecting normal water supply, can also avoid the wearing and tearing that equipment is unnecessary.
Comprehensively above-mentioned, the automatic water supply device that the embodiment of the present invention provides and method, according to the period, at least two ductwork pressure setting values are set, pressure sensor detects the force value of current water supply network, and current pressure values is sent to controller, the pressure set points of current pressure values and present period is carried out computing by controller, and the output of the adjustment supply-water pump adapted according to operation result.When water demand amount is larger, the force value of setting is comparatively large, so that increase the output of supply-water pump; When water demand amount is less, the force value of setting is less, so that reduce the output of supply-water pump.Compared with prior art, automatically can adjust output according to the water supply requirement of present period, when water resource use amount is larger, the demand supplied water can not only be met, simultaneously when water resource use amount is less, save water resource.
It should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. automatic water supply device, is characterized in that, comprising: controller, carry out pressure sensor and the supply-water pump of data cube computation with described controller;
Wherein, described controller is provided with at least two pressure set points according to the period; Described pressure sensor is used for the current pressure values detecting water supply network in real time, and described current pressure values is sent to described controller; The pressure set points of described current pressure values and present period is carried out computing by described controller, and regulates the output of described supply-water pump according to operation result.
2. equipment as claimed in claim 1, it is characterized in that, described controller comprises PID PID adjustment module and variable frequency adjustment module;
Described PID adjustment module, for the pressure set points of described current pressure values and described present period is carried out PID arithmetic, and regulates frequency-variable module according to operation result; Described frequency-variable module, for controlling the output of supply-water pump by the adjustment of operating frequency.
3. equipment as claimed in claim 1 or 2, it is characterized in that, described supply-water pump comprises the first supply-water pump and the second supply-water pump, and wherein, described frequency-variable module carries out variable frequency adjustment to described first supply-water pump or described second supply-water pump.
4. equipment as claimed in claim 1, is characterized in that, also comprise the touch screen displays be connected with described controller data, and described touch screen displays receives amendment information.
5. equipment as claimed in claim 1, be is characterized in that, also comprise the water tank be communicated with described supply-water pump by described water supply network, be provided with air bag in described water tank.
6. automatic water-supply method, is characterized in that, comprising:
The current pressure values of water supply network is detected by pressure sensor;
By controller, the pressure set points of described current pressure values and present period is carried out computing, wherein, described controller is provided with at least two pressure set points according to the period;
The output of supply-water pump is regulated according to operation result.
7. method as claimed in claim 6, is characterized in that, described controller regulates the output of supply-water pump according to operation result, comprising:
When the output of described first supply-water pump reaches maximum value, when described current pressure values is less than the pressure set points of described present period, the output of described first supply-water pump is adjusted to specified output, regulates the output of the second supply-water pump; Or,
When the output of described second supply-water pump reaches maximum value, when described current pressure values is less than the pressure set points of described present period, the output of described second supply-water pump is adjusted to specified output, regulates the output of described first supply-water pump.
8. method as claimed in claim 6, is characterized in that, described controller regulates the output of supply-water pump according to operation result, comprising:
When the output of described first supply-water pump reaches minimum value, when described current pressure values is greater than the pressure set points of described present period, cut off the water supply of described first supply-water pump, regulate the output of described second supply-water pump; Or,
When the output of described second supply-water pump reaches minimum value, when described current pressure values is greater than the pressure set points of described present period, cut off the water supply of described second supply-water pump, regulate the output of described first supply-water pump.
9. method as claimed in claim 6, is characterized in that, also comprise:
Amendment information is received by touch display screen;
Amendment information is stored in the corresponding period as new pressure set points.
10. the method as described in claim arbitrary in claim 6 to 9, is characterized in that, also comprise:
When the water in described water supply network flows out water tank, the air bag be arranged in described water tank is compressed;
When the pressure of described air bag reaches peak, cut off described supply-water pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718501.3A CN104532906A (en) | 2014-12-02 | 2014-12-02 | Automatic water supply device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410718501.3A CN104532906A (en) | 2014-12-02 | 2014-12-02 | Automatic water supply device and method |
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| CN104532906A true CN104532906A (en) | 2015-04-22 |
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| CN201410718501.3A Pending CN104532906A (en) | 2014-12-02 | 2014-12-02 | Automatic water supply device and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005222415A (en) * | 2004-02-06 | 2005-08-18 | Takenaka Komuten Co Ltd | Control method of well device, and well device |
| CN100511068C (en) * | 2006-12-21 | 2009-07-08 | 上海联达节能科技有限公司 | Intelligent pressure regulating water supply controlling method |
| CN103388350A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Frequency-conversion constant-pressure water supply system based on PLC (Programmable Logic Controller) |
| CN203383267U (en) * | 2013-07-13 | 2014-01-08 | 长沙斯科供水设备有限公司 | Integrated three-cavity type steady flow compensation system |
| CN203498903U (en) * | 2013-09-24 | 2014-03-26 | 广州三晶电气有限公司 | Intelligent constant pressure water supply device |
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- 2014-12-02 CN CN201410718501.3A patent/CN104532906A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005222415A (en) * | 2004-02-06 | 2005-08-18 | Takenaka Komuten Co Ltd | Control method of well device, and well device |
| CN100511068C (en) * | 2006-12-21 | 2009-07-08 | 上海联达节能科技有限公司 | Intelligent pressure regulating water supply controlling method |
| CN103388350A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Frequency-conversion constant-pressure water supply system based on PLC (Programmable Logic Controller) |
| CN203383267U (en) * | 2013-07-13 | 2014-01-08 | 长沙斯科供水设备有限公司 | Integrated three-cavity type steady flow compensation system |
| CN203498903U (en) * | 2013-09-24 | 2014-03-26 | 广州三晶电气有限公司 | Intelligent constant pressure water supply device |
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Application publication date: 20150422 |
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