CN201574194U - Sacrificial anode and water heater - Google Patents
Sacrificial anode and water heater Download PDFInfo
- Publication number
- CN201574194U CN201574194U CN2009202834106U CN200920283410U CN201574194U CN 201574194 U CN201574194 U CN 201574194U CN 2009202834106 U CN2009202834106 U CN 2009202834106U CN 200920283410 U CN200920283410 U CN 200920283410U CN 201574194 U CN201574194 U CN 201574194U
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- water tank
- triode
- sacrificial anode
- metal water
- anode
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Abstract
The utility model relates to a sacrificial anode applied in water tank of water heater, which belongs to the corrosion protection technology field. The sacrificial anode comprises: an anode apparatus disposed in a metal water tank, a triode with the emitter and the collector respectively connected between the anode apparatus and the metal water tank body, a detection circuit disposed in the metal water tank for detecting predetermined parameters, and a control circuit for controlling the base current of the triode according to the incoming detection signal; the input terminal of the control circuit is connected with the detection signal output terminal of the detection circuit, and the control output terminal is connected with the base of the triode. The sacrificial anode of the utility model can control the protection current of the sacrificial anode and the water tank of water heater within an ideal minimum range, thereby achieves the purpose of furthest prolonging the service life of the sacrificial anode and the water tank of water heater.
Description
Technical field
The utility model relates to a kind of sacrificial anode, and especially a kind of sacrificial anode that is applied to water-heater water tank also relates to the water-heater that uses this sacrificial anode simultaneously, belongs to the corrosion protection technology field.
Background technology
Sacrificial anode is as a kind of typical cathode steel iron rot means of defence, is extensive use of containing on the water-heater of water tank.Sacrificial corrosion speed is often too fast in the reality, needs frequently to change, otherwise usually leaks because of changing the untimely quick burn into of water tank that causes.
In order to prolong the life-span of sacrificial anode; a kind of thinking of easy understanding is to reduce by the anodic protective current keeping under the prerequisite of cathodic protection potential; transfer on the negative electrode because protective current comes down to the electronics orientation of anode metal, and on negative electrode, cathodic reaction takes place.Anode metal loses and becomes metal ion behind the electronics and incorporate gradually in the water, forms anodic consumption.Reduce protective current, just need to increase the impedance between sacrificial anode and the water tank.
Employing water-heater and sacrificial anode of series impedance between sacrificial anode and water-heater water tank comes out at present.As application number is that the Chinese patent of 200580041428.X has been announced a kind of water-heater, adds impedance type interface such as conductive polymers or coating on the articulamentum between its anode and the water tank, and the resistance of coating is between 5-600 ohm or 30-60 ohm.And for example; application number is that 200520015248.1 Chinese patent has been announced a kind of sacrificial anode; the resistance of resistance is set in series connection between its anode and the water-heater water tank; reduce protective current by the resistance that increases between negative electrode and the anode; thereby prolong anode life, the size of resistance is between 100-300 ohm.
These prior aries have a common characteristic to be, the impedance magnitude that is connected between sacrificial anode and the water tank is predefined, in use can not change, and therefore require the necessary size to fit of added resistance.Resistance is too small, and the effect that reduces protective current is limited, does not have the purpose that reduces protective current, slows down anode consumption speed.Resistance is excessive, and protective current is too small, can make anodic emission unsteady flow too small, makes water tank polarized potential deficiency, and sacrificial anode does not have effect on the contrary.
In fact, the many conditions in the water heater working process all influence the anodic protection electric current.For example, under similarity condition, electrical conductivity of water is high more in the water tank, and protective current can be big more, and the electrical conductivity of water of different zones can great changes have taken place; Under the constant condition of water quality, water temperature is high more, and specific conductivity is high more, and for example test shows that water temperature is elevated to 70 ℃ of specific conductivity from 20 ℃ and has very big variation; Same inner plating enamelled water tank can have very big variation than the life-span for a long time at the later stage of life cycle enamel defect area, and promptly the size of negative electrode has bigger variation, and this also can increase protective current.On the other hand, at this moment sacrificial anode just needs bigger protective current to keep the polarized potential of water tank as far as possible to can to occur that provide protection to water tank reduces be the phenomenon that the water tank polarized potential reduces the middle and later periods in life-span.
Electric water heater in use unavoidably can be subjected to above-mentioned various factors influence; and above prior art can't change the resistance that be connected between anode and the water tank according to the variation of various factors, and therefore can't accomplish not only provides enough protections, but also makes protective current as far as possible little water tank.
The utility model content
The technical problems to be solved in the utility model is: at the weak point of above prior art existence; pass through optimization design; a kind of sacrificial anode of working order (including but not limited to water quality, water temperature, electrical conductivity of water etc.) auto-control protective current that can be different according to water-heater is proposed; make it not only enough protections were provided, but also make protective current as far as possible little, thereby reach the purpose that prolongs sacrificial anode and water-heater water tank work-ing life to greatest extent water tank.
The applicant has formed general technical solution of the present utility model through repetition test research: a kind of sacrificial anode comprises the anode assembly (for example anode bar) that is placed in the metal water tank; Comprise that also emitter and collector connects at least one triode between the body of described anode assembly and described metal water tank respectively; Be placed in the testing circuit that detects preset parameter in the described metal water tank; Be used for controlling the pilot circuit of described transistor base electric current according to the input detection signal, the described testing circuit detection signal of the input termination output terminal of described pilot circuit, and its control output end connects the base stage of described triode.
Adopt the water-heater of above-mentioned sacrificial anode, comprise metal water tank and pilot circuit, be mounted with the testing circuit of anode assembly and detection preset parameter in the described metal water tank; Connect the emitter and collector of at least one triode between the body of described anode assembly and described metal water tank respectively; The detection signal output terminal of the described testing circuit of input termination of described pilot circuit, and its control output end connects the base stage of described triode.
During work; after testing circuit detects preset parameter continuously or regularly; through relatively judging; the base current of regulation and control triode; thereby make the corresponding as required change of protective current between the collector and emitter; because the electric current by collector electrode equals by the protective current between sacrificial anode and the water tank; therefore the result can be controlled at the protective current by sacrificial anode and water-heater water tank in the ideal minimum extent, thereby reaches the purpose that prolongs sacrificial anode and water-heater water tank work-ing life to greatest extent.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the schematic circuit diagram of the utility model embodiment one.
Fig. 2 is the schematic circuit diagram of the utility model embodiment two.
Embodiment
Embodiment one
The sacrificial anode of present embodiment and the water-heater that adopts this sacrificial anode are placed in the metal water tank 2 as the anode bar 1 of anode assembly as shown in Figure 1; Be serially connected with triode Q1 between the body of anode bar 1 and metal water tank 2, the emitter and collector of this triode is electrically connected with metal water tank 2 with anode bar 1 respectively.The testing circuit that is made of reference electrode 3 and current potential detecting unit also is housed in the metal water tank 2, wherein reference electrode 3 is used to detection water-heater water tank body potential that the benchmark position is provided, the current potential detecting unit mainly is made of the operational amplifier A that positive inverting input connects reference electrode and metal water tank body respectively, is used to gather the potential difference between water tank and reference electrode.MCU control unit and current regulation unit are formed pilot circuit.The output of operational amplifier A is exported the signal input part that meets MCU as the signal of testing circuit, receives the potential difference signal of self-potential detecting unit, according to the steering logic that is preset in the MCU, regulates output pwm signal.Current regulation unit is made of the amplifying circuit that diode ﹠ transistor Q2, Q3 constitute; its control output end connects the base stage of triode Q1; be used for regulating the base current Ib of output according to pwm signal; thereby the collector current Ic of regulation and control triode Q1 reaches the purpose of regulating protective current between sacrificial anode and tank body.
In addition, also be serially connected with the power-off protecting circuit that is controlled by MCU normally closed switch device K formation in the present embodiment between water tank and the anode bar 1.When electric current can be regulated the sacrificial anode cisco unity malfunction, MCU can control anode bar and tank body is electrically connected, and still can play the effect of protection tank body.
During work; the current potential detecting unit detects the potential difference between reference electrode and the tank body in real time or periodically; and signal transmitted the MCU control unit; when this potential difference exceeds potential difference scope default in the MCU control unit; just adjust the dutycycle of pwm signal according to default step-length by the MCU control unit; change the base current Ib of triode by current regulation unit; thereby change the transistor collector electric current; and then the protective current between adjustment sacrificial anode and the tank body, in the scope that this potential difference is being preset.So just can make protective current by sacrificial anode and tank body in ideal range, prolong the sacrificial anode purpose in work-ing life thereby reach.When the sacrificial anode cisco unity malfunction, the normally closed switch device directly is connected water tank with sacrificial anode, thereby reaches the purpose of protection tank body.
Embodiment two
Present embodiment as shown in Figure 2, basic structure and embodiment one roughly the same, main difference is: connect respectively between the body 2 of anode bar 1 and metal water tank one group of triode Q1 in parallel, Q2 ... the emitter and collector of Qn.As the control output end of the MCU of pilot circuit respectively through substitutional resistance connect each triode Q1, Q2 ... the base stage of Qn.In other words, collector and emitter and the resistance series connection that resistance is suitable with a triode, parallel-series is between sacrificial anode and the water tank, the base stage of this triode is connect the MCU control unit, triode can be switched between off condition and saturation conduction state by the control base current.When triode ended, this resistance did not just insert between sacrificial anode and the water tank, and when the triode conducting, this resistance just inserts between sacrificial anode and the water tank.The resistance of above-mentioned triode and series connection with it as a branch road, a plurality of such branch roads are parallel between sacrificial anode and the water tank, the transistor base of each branch road all is connected with the MCU control unit, each branch road controlled by the MCU control unit by/conducting state.
During work; the current potential detecting unit detects the potential difference between reference electrode and the tank body in real time or periodically; and transfer signals to the MCU control unit; by default potential difference and each the branch road conduction and cut-off state synopsis of MCU control unit basis; export corresponding level controling signal combination; combination realizes the conducting of each triode branch road or ends current control circuit according to level controling signal; thereby realize between anode and water tank, the connect resistor network of different equivalent resistance of the potential difference correspondence of different range; so just can make protective current by sacrificial anode and tank body in ideal range, prolong the sacrificial anode purpose in work-ing life thereby reach.When electric current can be regulated the sacrificial anode cisco unity malfunction, the normally closed switch device directly was connected water tank with sacrificial anode, thereby reached the purpose of protection tank body.
In addition to the implementation, the utility model can also have other embodiments.For example, testing circuit also can adopt specific conductivity detecting unit, temperature detecting unit, sacrificial anode current detecting unit and other forms of detection feedback unit except adopting the current potential detecting unit.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (8)
1. a sacrificial anode comprises the anode assembly that is placed in the metal water tank; It is characterized in that also comprising: emitter and collector connects at least one triode between the body of described anode assembly and described metal water tank respectively; Be placed in the testing circuit that detects preset parameter in the described metal water tank; Be used for controlling the pilot circuit of described transistor base electric current according to the input detection signal, the described testing circuit detection signal of the input termination output terminal of described pilot circuit, and its control output end connects the base stage of described triode.
2. sacrificial anode according to claim 1, it is characterized in that: described testing circuit is made of the reference electrode and the current potential detecting unit that are contained in the metal water tank, and described current potential detecting unit mainly is made of the operational amplifier that positive inverting input connects reference electrode and metal water tank body respectively.
3. sacrificial anode according to claim 2 is characterized in that: described pilot circuit is made up of MCU control unit and current regulation unit, and described current regulation unit is made of the amplifying circuit that diode ﹠ transistor constitutes.
4. sacrificial anode according to claim 2, it is characterized in that: connect the emitter and collector of one group of triode in parallel between the body of described anode assembly and metal water tank respectively, connect the base stage of each triode as the MCU control output end of pilot circuit respectively through substitutional resistance.
5. a water-heater comprises metal water tank and pilot circuit, it is characterized in that: the testing circuit that is mounted with anode assembly and detection preset parameter in the described metal water tank; Connect the emitter and collector of at least one triode between the body of described anode assembly and described metal water tank respectively; The detection signal output terminal of the described testing circuit of input termination of described pilot circuit, and its control output end connects the base stage of described triode.
6. water-heater according to claim 5, it is characterized in that: described testing circuit is made of the reference electrode and the current potential detecting unit that are contained in the metal water tank, and described current potential detecting unit mainly is made of the operational amplifier that positive inverting input connects reference electrode and metal water tank body respectively.
7. water-heater according to claim 6 is characterized in that: described pilot circuit is made up of MCU control unit and current regulation unit, and described current regulation unit is made of the amplifying circuit that diode ﹠ transistor constitutes.
8. water-heater according to claim 6, it is characterized in that: connect the emitter and collector of one group of triode in parallel between the body of described anode assembly and metal water tank respectively, connect the base stage of each triode as the MCU control output end of pilot circuit respectively through substitutional resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202834106U CN201574194U (en) | 2009-12-18 | 2009-12-18 | Sacrificial anode and water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202834106U CN201574194U (en) | 2009-12-18 | 2009-12-18 | Sacrificial anode and water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201574194U true CN201574194U (en) | 2010-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202834106U Expired - Lifetime CN201574194U (en) | 2009-12-18 | 2009-12-18 | Sacrificial anode and water heater |
Country Status (1)
| Country | Link |
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| CN (1) | CN201574194U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853551A (en) * | 2012-08-31 | 2013-01-02 | 艾欧史密斯(中国)热水器有限公司 | Water heater anode bar consumption prompting method and device |
| CN102865663A (en) * | 2012-08-03 | 2013-01-09 | 苏州新亚科技有限公司 | Galvanized steel sheet water heater antirust water tank and corrosion prevention method thereof |
| CN108105004A (en) * | 2017-12-14 | 2018-06-01 | 重庆市大为能源有限公司 | Methanol tolerant oil pump and oil supply system |
| CN110023690A (en) * | 2016-11-08 | 2019-07-16 | A.O.史密斯公司 | Control the system and method with the water heater of powered anode |
-
2009
- 2009-12-18 CN CN2009202834106U patent/CN201574194U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865663A (en) * | 2012-08-03 | 2013-01-09 | 苏州新亚科技有限公司 | Galvanized steel sheet water heater antirust water tank and corrosion prevention method thereof |
| CN102865663B (en) * | 2012-08-03 | 2015-04-15 | 苏州新亚科技有限公司 | Galvanized steel sheet water heater antirust water tank and corrosion prevention method thereof |
| CN102853551A (en) * | 2012-08-31 | 2013-01-02 | 艾欧史密斯(中国)热水器有限公司 | Water heater anode bar consumption prompting method and device |
| CN102853551B (en) * | 2012-08-31 | 2014-06-25 | 艾欧史密斯(中国)热水器有限公司 | Water heater anode bar consumption prompting method and device |
| CN110023690A (en) * | 2016-11-08 | 2019-07-16 | A.O.史密斯公司 | Control the system and method with the water heater of powered anode |
| CN110023690B (en) * | 2016-11-08 | 2021-05-14 | A.O.史密斯公司 | System and method for controlling a water heater having an energized anode |
| CN108105004A (en) * | 2017-12-14 | 2018-06-01 | 重庆市大为能源有限公司 | Methanol tolerant oil pump and oil supply system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100908 |
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| CX01 | Expiry of patent term |