CN203730348U - Current pressure controller of water pump based on ceramic pressure sensor - Google Patents
Current pressure controller of water pump based on ceramic pressure sensor Download PDFInfo
- Publication number
- CN203730348U CN203730348U CN201420150698.0U CN201420150698U CN203730348U CN 203730348 U CN203730348 U CN 203730348U CN 201420150698 U CN201420150698 U CN 201420150698U CN 203730348 U CN203730348 U CN 203730348U
- Authority
- CN
- China
- Prior art keywords
- pressure
- water pump
- ceramic
- chip microcomputer
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The utility model relates to a current pressure controller of a water pump based on a ceramic pressure sensor. The current pressure controller comprises a pressure sensor, a CT (Current Transformer) and an SCM (Single Chip Microcomputer), wherein the pressure sensor is connected with a pressure detecting port of the SCM through an amplifying circuit, and the CT is connected with a current detecting port of the SCM through a sampling circuit; an input power wire of the water pump penetrates through the CT and is in series connection with a control switch of a relay, an input power supply of the water pump is used for supplying electricity to the relay and the SCM through a voltage transforming and rectifying circuit, and a control circuit of the SCM is in series connection with a power supply circuit of the relay. According to the current pressure controller of the water pump based on the ceramic pressure sensor, disclosed by the utility model, pressure detecting, pressure buffering and pressure controlling are integrated, and the current pressure controller has the characteristics that the size is small and exquisite, and the structure is novel.
Description
Technical field
the utility model relates to Water pump pressure controller, specifically a kind of based onthe water pump electric current pressure controller of ceramic pressure sensor.
Background technique
The birth of automatic pump has brought very large convenience to the mankind's life, along with further developing of national economy, the working life of people to water pump, the automation control of water pump requires more and more higher, and water-aspirator pressure control gear in the market is probably divided into following a few class:
(1) mechanical pressure switch+pressurized tank;this technological scheme is the current the most general pressure control device of the most traditional use, but its major defect is: mechanical noise rings, and pressure regulates difficulty, contact is easily oxidized, and working life is short, and control accuracy is low, there is pressure control dead band, and can frequent starting at small water flow controlling filed Heshui pump.
(2) electronic integrated formula pressure controller;this technological scheme is that pressure control, pressure buffer device and circuit board control section are integrated in a plastic tank, responding to current pressure by the movable magnet in the dry reed-pipe to-controller water intake in circuit board changes, at aspect of performance than slightly advantage of the first scheme, but user regulates cumbersome equally to pressure, easily there is misoperation in small water flow control occasion, disturbing factor is many, and expensive, so the occupancy in market does not have obvious advantage at home.
(3) pointer photovoltaic principals pressure controller;this scheme is to utilize photoelectric sensor, pressure gauge, intergrated circuit and some plastics machinery parts composition, returns to swing up and down by the pointer in pressure gauge the Kai Heguan that controls water pump.Compared with 2 kinds of schemes above, the advantage of this scheme is that breakout pressure is followed and stopped pressure and can arbitrarily set, just there is certain pressure difference with between halt in the start-up point of water pump like this, can effectively prevent water pump frequent starting, but one of his shortcoming is for being subject to light source interference effect large, particularly sunlight, if user does not carry out shading treatment, controller just there will be malfunctioning, shortcoming two, this scheme circuit power part adopts the resistance-capacitance depressurization method of non-isolation, and its stability all needs user with reliability and further tests.Shortcoming three, because be to contact photoelectric sensor by pointer, if the relatively whole dial plate of pointer is non-central, photoelectric sensor is provided with deviation, water pump just there will be pointer to block in control procedure like this, causes controller malfunctioning.
(4) pointer hall principle pressure controller;this scheme is similar with the third scheme substantially, unique difference is that the third scheme is that then the induction groove passing through in photoelectric sensor by pointer provides signal, and this scheme is, at pointer front end, magnetic bodies is installed, Hall transducer is all equipped with halt in start-up point, when pointer will provide control signal near Hall transducer.Compared with the third scheme, his advantage is not disturbed by light source, and shortcoming is: the bad control of magnet magnetic size of pointer front end, if magnetic does not just receive signal a little less than too, the too strong easily misoperation of magnetic, and also control accuracy is low, there is dead band in pressure control, is not suitable for little lift water pump.
(5) silicon chip induction pressure controller with digital display;this scheme principle is that the pressure size being added on silicon chip is followed proportional realization of silicon chip brachium pontis output voltage; his advantage is can regulate continuously without dead band in range ability internal pressure; pressure can show with nixie tube in real time; his shortcoming be silicon chip long-term stressed after; stability can decline; and the more difficult realization of excessive low water level protection function; because the occasion that much supplies water has residual pressure in Water pump head position or pipeline after lack of water; sometimes show 0.2kg; sometimes show 0.5kg, user is just difficult to hold in setting lack of water pressure.Further, this pressure controller circuit part adopts resistance-capacitance depressurization, and in anti-lightning, anti-transient voltage aspect exists certain defect, is also not suitable for high powered water pump control more than 1.1kw.
(6) flow sensing+sensitive switch+electronic pressure controller; This scheme utilizes dry reed-pipe or Hall element to add a flow switch of special magnet composition, in the time of tap water outlet, flow switch just sends a voltage signal, or pulse train ripple, after the single-chip microcomputer in circuit board receives, opens with regard to automatically controlled water pump, in the time that closing, tap just can't detect the signal of flow switch, at this moment, manifold pressure starts to rise, and has triggered sensitive switch, when circuit board receives sensitive switch signal, with regard to automatic closing water pump.This scheme complex structure, shortcoming is various, as long as because it has detected that water flow just starts water pump, can effectively avoid although it is so the frequent starting of water pump, but for tap water voltage supply user, just there is no need to start water pump in small water flow control occasion, can rely on the pressure of water supply pipe itself to maintain current completely, energy-conservationly like this save trouble again, can also extend the working life of water pump, besides dry reed-pipe might as well, Hall element might as well, size for magnetic is very responsive, when in the domestic water of magnet long period of soaking at different quality, its magnetic property is certain to change, cause control malfunctioning.
Model utility content
the purpose of this utility model be to provide a kind of based onthe water pump electric current pressure controller of ceramic pressure sensor, adopting the pressure transducer of ceramic package is water pressure sensing source, the pressure transducer of ceramic package is connected with adopting single-chip microcomputer, in realizing every product function, all rely on as much as possible software program to complete, on product structure, the utility model collection Pressure testing, pressure buffer, pressure is controlled in one, has volume small and exquisite, the feature of novel structure.
As long as the utility model is directly installed on original pressurized tank position for common automatic pump, for other non-automatic pumps, as long as an additional threeway just can support the use in pump outlet position, very convenient.
For achieving the above object by the following technical solutions:
a kind of based onthe water pump electric current pressure controller of ceramic pressure sensor, it is characterized in that: comprise pressure transducer, current transformer and single-chip microcomputer, described pressure transducer connects the Pressure testing port of single-chip microcomputer by amplification circuit, current transformer connects the current detecting port of single-chip microcomputer by sample circuit; The input power cord of water pump passes current transformer, and connects with the control switch of relay, and water pump input power is relay and single-chip microcomputer power supply through transformation rectification circuit, and the control circuit of single-chip microcomputer is serially connected on the power supply circuits of relay.
The Data Input Interface connection data programming circuit of described single-chip microcomputer.
On described single-chip microcomputer, be connected with buzzer alarm circuit.
Described pressure transducer comprises ceramics seat and ceramic diaphragm, ceramics seat and ceramic diaphragm overall package, ceramic diaphragm is elastomer, thick-film resistor is printed on a side of ceramic diaphragm, connect into a resistance bridge, ceramic diaphragm opposite side directly with measured medium contact, resistance bridge is by the Pressure testing port of described amplification circuit connection single-chip microcomputer.
Described electric current pressure controller other parts except pressure transducer and input power cord are enclosed in box body inside, box body adopts the sealing of fluorine glue seal ring, box body is connected to pump outlet by jointing, and described pressure transducer is contained in jointing.
The utility model adopts advanced singlechip technology, in realizing every product function, all rely on as much as possible software program to complete, omit the hardware material of multiple costliness, in similar, there is very high cost performance, on product structure, the utility model collection Pressure testing, pressure buffer, pressure is controlled in one, there is volume small and exquisite, the feature of novel structure, in mechanical seal, adopt special fluorine glue seal ring, inlet wire outlet adopts water joint, security level is IP65, as long as the utility model is directly installed on original pressurized tank position for common automatic pump, for other non-automatic pumps, as long as an additional threeway just can support the use in pump outlet position, very convenient.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the circuit diagram of the utility model force samples;
Fig. 3 is the circuit diagram of the utility model current sample;
Fig. 4 is the utility model bang-bang circuit.
Fig. 5 is the utility model single-chip microcomputer and auxiliary cicuit figure;
Fig. 6 is the utility model nixie tube circuit diagram.
Embodiment
As shown in Fig. 1-6,
a kind of based onthe water pump electric current pressure controller of ceramic pressure sensor, comprise pressure transducer, current transformer, input power cord and single-chip microcomputer, other parts except pressure transducer and input power cord are enclosed in box body 1 inside, box body 1 adopts the sealing of fluorine glue seal ring, box body 1 is connected to pump outlet by jointing 2, described pressure transducer comprises ceramics seat and ceramic diaphragm, ceramics seat and ceramic diaphragm overall package, ceramic diaphragm is elastomer, thick-film resistor is printed on a side of ceramic diaphragm, connect into a resistance bridge, ceramic diaphragm opposite side directly with measured medium contact, resistance bridge connects the Pressure testing port of single-chip microcomputer by described amplification circuit, described pressure transducer is contained in jointing, ceramics seat has coordinated location sealing effect with jointing, pressure signal is changed into electrical signal by the pressure of ceramic diaphragm effect induction pump outlet.
Described pressure transducer connects the Pressure testing port of single-chip microcomputer by amplification circuit, current transformer connects the current detecting port of single-chip microcomputer by sample circuit; The input power cord of water pump is through current transformer, and connect with the control switch of relay, water pump input power is relay and single-chip microcomputer power supply through transformation rectification circuit, the control circuit of single-chip microcomputer is serially connected on the power supply circuits of relay, Data Input Interface connection data programming circuit, buzzer alarm circuit, nixie tube circuit and the overvoltage/undervoltage testing circuit of described single-chip microcomputer.
The utility model is taking special cermacis diaphragm as elastomer, thick-film resistor is printed on a side of ceramic diaphragm, connect into a resistance bridge, ceramic diaphragm opposite side directly with measured medium contact, because special ceramic material has good chemical stability, do not need to increase the protection to ceramic diaphragm, measured medium directly impacts the piezoresistive effect of ceramic diaphragm, make electric bridge produce a highly linear being directly proportional to pressure, also the millivolt magnitude voltage signals being directly proportional to energizing voltage, pass through again material prescription, zeroing and temperature compensation, sensor output signal has good conformity aspect time stability and temperature stability.
Because ceramic pressure sensor signal is out very faint, in order to allow single-chip microcomputer can better identify it, the utility model adopts LM2904 to carry out linearity amplification to this signal, its low price, and the linearity is high, and operating temperature range is wide.In addition, when signal amplifies, increase immunity module, common mode signal has been carried out to effective inhibition.Because LM2904 self exists the offset voltage about 2MV, and ceramic pressure sensor signal is out 0 ~ 10MV, and in the situation that pressure is smaller, general amplification circuit can not effectively be identified.But we are lifted to zero point near 2.5V in design, thereby solve this technical barrier.For pressure controling precision being accomplished to 0.1KG, in single-chip microcomputer type selecting, we also weigh in the hand repeatedly, final decision adopts STM8S series, its built-in A/D converter, 10 of A/D sampling precisions, in sheet, carry RC vibrator circuit, meet the utility model requirement completely, in improving stability, also reduced the cost of product.On current sample, the utility model has adopted precise rectification circuit, solve the problem of the little electric current None-identified that conventional diode rectification circuit brings, and on algorithm, adopt comparison method one by one to determine the maximum value of electric current, then obtained actual current by the relation of maximum value and effective value.Intermediary button in five buttons of the utility model is function key, length is pressed function key 5 seconds, the utility model just carries out pressure zero clearing action, and except zero clearing, miscellaneous function selection and unlock password function, in the middle of this key can also be used to switch, nixie tube shows current pressure or shows current electric current.All the other 4 buttons are "+", "-" regulatory function, in the time that actual pressure is less than breakout pressure, and the utility model control starting mode of pump; When actual pressure exceedes while stopping pressure, the utility model switches off the pump.In the time that user presses function key and is switched to electric current display interface, the right nixie tube furnishing ' 08 ' user just can be revised to overcurrent setting value; Whether the right nixie tube furnishing ' 11 ' user just can be selected to open time delay function; The right nixie tube furnishing ' 12 ', user just can select whether to open overvoltage/undervoltage protective function; The right nixie tube furnishing ' 13 ' user just can be selected whether to open excessive low water level protection function; The right nixie tube furnishing ' 14 ' user just can be set to lack of water detection time.The utility model output control part adopts triode to drive the scheme of relay, and is with fly-wheel diode, guarantees that relay coil is not subject to the impact of inverse electromotive force.
the realization of excessive low water level protection function:in normal water utilizing process, in the time that actual pressure is less than lower limit start-up point, water pump can be opened automatically, under the prerequisite of having abundant water resources, in pipeline, hydraulic pressure can rise gradually or approach start-up point pressure, be less than 60% of user's lower limit breakout pressure setting value and work as discharge pressure, and continue 5 seconds, there is lack of water situation in the utility model just judgement, at this moment buzzer starts to report to the police, fault indicating lamp starts flicker, reaches 3 minutes, the utility model positive closing water pump when the lack of water time, display screen prompting ' 00 ' code, informs that lack of water fault appears in user.Lack of water is closed after pump, and whether the utility model can be controlled water pump and again detect to supply water every 30 minutes and recover.
the realization of overload flow function: the utility model can arrange the overcurrent of pump motor, when motor generation stall, impeller are stuck, in the situation of water pump overwork, current electric current reaches 1 ~ 1.5 times of user's setting value, and while continuing 5 seconds, buzzer of the present utility model starts to report to the police, and fault indicating lamp starts flicker, in the time that overload time exceedes 20 seconds, the utility model positive closing motor, and prompting ' 55 '; Current electric current reaches 1.5 ~ 2 times of operating current of setting, and while continuing 5 seconds, buzzer of the present utility model starts to report to the police, and fault indicating lamp starts flicker, in the time that overload time exceedes 10 seconds, and the utility model positive closing motor, and prompting ' 88 '; Current electric current reaches sets the more than 2 times of operating current, and continues 2 seconds time the utility model positive closing motor, and prompting ' 99 ';
the realization of overvoltage/undervoltage function;the utility model limits the operating voltage of pump motor, and scope is from 175V ~ 275V.When voltage exceedes 275V, and continue 5 seconds time, buzzer of the present utility model starts to report to the police, and fault indicating lamp starts flicker, in the time that the overvoltage time exceedes 20 seconds, and the utility model positive closing water pump, and prompting ' 77 '; When voltage is lower than 175V, and continue 5 seconds time, buzzer of the present utility model starts to report to the police, and fault indicating lamp starts flicker, in the time that the under-voltage time exceedes 20 seconds, and the utility model positive closing motor, and prompting ' 11 '.
Because the utility model adopts advanced singlechip technology, in realizing every product function, all rely on as much as possible software program to complete, omit the hardware material of multiple costliness, in similar, there is very high cost performance, on product structure, the utility model collection Pressure testing, pressure buffer, pressure is controlled in one, there is volume small and exquisite, the feature of novel structure, in mechanical seal, adopt special fluorine glue seal ring, inlet wire outlet adopts water joint, security level is IP65, as long as the utility model is directly installed on original pressurized tank position for common automatic pump, for other non-automatic pumps, as long as an additional threeway just can support the use in pump outlet position, very convenient.
in additionbecause the utility model circuit board adopts sufficient power isolating transformer as controlling power supply; aspect anti-lightning strike, anti-electrical network surge, there iing obvious advantage; relay adopts high-power 30A composite silver contact; contact protection adopts piezoresistance extinguishing arc; contact endurance can reach more than 150,000 times; actual loading power can reach 2200W, and other like products can only accomplish that 1500W is even below 1100W.
The utility model is operating as design starting point with hommization, breakout pressure, current pressure, stops all independent digital demonstrations of pressure, and current pressure specially shows in real time with digital green pipe, very directly perceived, understands.Breakout pressure, stop pressure and can heighten or turn down by four independent buttons according to user's actual used water situation, such setting means can avoid the frequent starting of water pump can reach again certain constant voltage effect effectively, solve the suddenly big or suddenly small of user's water-outlet quantity, the sometimes hot and sometimes cold problem of water heater shower.And in range ability, the utility model can be realized continuous in dead band adjusting, has both met small flow pressure control occasion and has also been applicable to large flow pressure control occasion.
in control accuracy with aspect applicable situation;because the utility model adopts the single-chip microcomputer that carries 10 high-precision A/D sampling channels, aspect pressure controling precision, can reach 0.1kg, these data, apparently higher than like product, make the utility model can be applied to high-precision pressure control occasion.Due to the good chemical performance of ceramic sensor element, so being not only applicable to cold water control occasion, the utility model is also applicable to hot water control occasion, be not only applicable to common Domestic blower pump and be also applicable to submersible pump, deep-well pump, and pollution discharge pump etc.
aspect excessive low water level protection judgement;aspect excessive low water level protection, the utility model is visited by continuous experiment and market, in conjunction with user's feedback opinion, has compiled the excessive low water level protection code of a set of novelty.When after starting mode of pump, current discharge pressure is lower than 60% of user's breakout pressure setting value, and this state continuance 3 minutes, just judges lack of water.And traditional lack of water basis for estimation is to want pipeline the inside to reach real 0 pressure, the method of such judgement is very unreasonable, due to the existence of pipeline the inside air, the diversity of pressure controller mounting point, even there is water shortage status in a lot of water occasions, also can there is residual pressure in pressure control point, do not reach 0 pressure, and the utility model just can solve this class situation.
aspect miscellaneous function and cryptoguard,the utility model has been broken through the pressure control function that traditional pressure controller is single, in realizing pressure automatic control, the utility model also provides multinomial miscellaneous function to allow user independently match, electric current by precision current transformer and one-chip computer module during to water pump operation carries out real-time sampling monitoring, once there is stall, stuck, electric current sharply rises, the utility model can switch off the pump in time, there is wide fluctuations at line voltage, overvoltage/undervoltage reaches 20% when above, the utility model also can switch off the pump in time, effectively avoid burning of pump motor.For ensureing that each user correctly uses the utility model; in the setting of water pump overcurrent; the utility model has adopted cipher protection function to prevent that user from arbitrarily revising overcurrent value; at excessive low water level protection function, overvoltage/undervoltage function, termination of pumping delay function fermentation, the utility model can be matched according to user's working control occasion.
The above is a better case study on implementation of the present utility model, is not departing under design of the present utility model and fundamental function prerequisite, carries out any apparent modification and replace all belonging to the utility model protection domain.
Claims (7)
1. the water pump electric current pressure controller based on ceramic pressure sensor, it is characterized in that: comprise pressure transducer, current transformer and single-chip microcomputer, described pressure transducer connects the Pressure testing port of single-chip microcomputer by amplification circuit, current transformer connects the current detecting port of single-chip microcomputer by sample circuit; The input power cord of water pump passes current transformer, and connects with the control switch of relay, and water pump input power is relay and single-chip microcomputer power supply through transformation rectification circuit, and the control circuit of single-chip microcomputer is serially connected on the power supply circuits of relay.
2. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 1, it is characterized in that: described pressure transducer comprises ceramics seat and ceramic diaphragm, ceramics seat and ceramic diaphragm overall package, ceramic diaphragm is elastomer, thick-film resistor is printed on a side of ceramic diaphragm, connect into a resistance bridge, ceramic diaphragm opposite side directly with measured medium contact, resistance bridge is by the Pressure testing port of described amplification circuit connection single-chip microcomputer.
3. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 2, it is characterized in that: described electric current pressure controller other parts except pressure transducer and input power cord are enclosed in box body inside, box body adopts the sealing of fluorine glue seal ring, box body is connected to pump outlet by jointing, and described pressure transducer is contained in jointing.
4. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 1, is characterized in that: the Data Input Interface connection data programming circuit of described single-chip microcomputer.
5. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 1, is characterized in that: on described single-chip microcomputer, be connected with buzzer alarm circuit.
6. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 1, is characterized in that: on described single-chip microcomputer, be connected with nixie tube circuit.
7. a kind of water pump electric current pressure controller based on ceramic pressure sensor as claimed in claim 1, is characterized in that: on described single-chip microcomputer, be connected with overvoltage/undervoltage testing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420150698.0U CN203730348U (en) | 2014-03-31 | 2014-03-31 | Current pressure controller of water pump based on ceramic pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420150698.0U CN203730348U (en) | 2014-03-31 | 2014-03-31 | Current pressure controller of water pump based on ceramic pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203730348U true CN203730348U (en) | 2014-07-23 |
Family
ID=51200426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420150698.0U Expired - Fee Related CN203730348U (en) | 2014-03-31 | 2014-03-31 | Current pressure controller of water pump based on ceramic pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203730348U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454484A (en) * | 2014-11-20 | 2015-03-25 | 谢庆武 | Sunlight microcomputer intelligent water pump |
| CN105402906A (en) * | 2015-12-08 | 2016-03-16 | 芜湖恒美电热器具有限公司 | Control device of solar water heater |
| WO2017093586A1 (en) | 2015-12-04 | 2017-06-08 | Coelbo Control System, S.L. | Electronic pressure switch |
| CN107781150A (en) * | 2016-08-26 | 2018-03-09 | 陈善界 | The motor start-up and shut-down control method and control device of supercharging equipment |
| CN114593073A (en) * | 2022-03-31 | 2022-06-07 | 苏州优德通力科技有限公司 | Constant-pressure deep well pump system and control method thereof |
-
2014
- 2014-03-31 CN CN201420150698.0U patent/CN203730348U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454484A (en) * | 2014-11-20 | 2015-03-25 | 谢庆武 | Sunlight microcomputer intelligent water pump |
| WO2017093586A1 (en) | 2015-12-04 | 2017-06-08 | Coelbo Control System, S.L. | Electronic pressure switch |
| CN105402906A (en) * | 2015-12-08 | 2016-03-16 | 芜湖恒美电热器具有限公司 | Control device of solar water heater |
| CN107781150A (en) * | 2016-08-26 | 2018-03-09 | 陈善界 | The motor start-up and shut-down control method and control device of supercharging equipment |
| CN107781150B (en) * | 2016-08-26 | 2020-09-11 | 杭州卓翁科技有限公司 | Motor start-stop control method and control device of supercharging equipment |
| CN114593073A (en) * | 2022-03-31 | 2022-06-07 | 苏州优德通力科技有限公司 | Constant-pressure deep well pump system and control method thereof |
| CN114593073B (en) * | 2022-03-31 | 2023-09-22 | 苏州优德通力科技有限公司 | Constant-pressure deep well pump system and control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203730348U (en) | Current pressure controller of water pump based on ceramic pressure sensor | |
| CN103120576B (en) | The draining of dish-washing machine controls testing circuit, dish-washing machine and draining thereof and detection method | |
| CN103064413B (en) | Programmable logic controller (PLC) and touch screen type water pump controller testing system | |
| CN201202661Y (en) | Constant pressure frequency conversion pump for water supply system | |
| CN101865532A (en) | Water heater power supply automatic controller | |
| CN205805876U (en) | Double pump intelligent controlling device | |
| CN201569922U (en) | Digital water level controller | |
| CN201144813Y (en) | Digital type compressor special-purpose protector | |
| CN102619738A (en) | Automatic control method and controller for water pump | |
| CN208081992U (en) | Fore filter with leak stop | |
| CN201593640U (en) | Household multifunctional water saving device | |
| CN202813573U (en) | Wall-hanging stove water heating system with automatic water replenishing function | |
| CN101227079A (en) | Protector special for digital type compressor | |
| CN110985889A (en) | Intelligent household gas pipeline control system | |
| CN207246804U (en) | Intelligent water leakage protective device | |
| CN201021982Y (en) | Intelligent traffic measurement and control instrument | |
| CN217643200U (en) | Automatic boost control circuit of noninductive household booster pump | |
| CN202382430U (en) | Energy saving control device of water heater | |
| CN103327747B (en) | A kind of corroding copper clad laminates of intelligent temperature control | |
| CN101858338A (en) | Electronic pressure controller for water pump water supply system | |
| CN201589953U (en) | Electronic control apparatus for full-automatic tea-drinking machine | |
| CN103423877B (en) | The pulse detection system of inner container of electric water heater and low consumption detection method | |
| CN213842623U (en) | Two-line valve running state detection device | |
| CN102944069A (en) | Heating boiler controller | |
| CN218917428U (en) | Simple portable flow measurement system device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20190331 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |