CN202268679U - Measuring and protecting device of submersible pump motor - Google Patents
Measuring and protecting device of submersible pump motor Download PDFInfo
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- CN202268679U CN202268679U CN2011202860324U CN201120286032U CN202268679U CN 202268679 U CN202268679 U CN 202268679U CN 2011202860324 U CN2011202860324 U CN 2011202860324U CN 201120286032 U CN201120286032 U CN 201120286032U CN 202268679 U CN202268679 U CN 202268679U
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Abstract
The utility model discloses a measuring and protecting device of a submersible pump motor, comprising a main controller and a cavity water seepage detection module. The cavity water seepage detection module comprises a water seepage detection voltage sampling unit, a water seepage detection signal conversion unit and a cavity water seepage output module used for breaking the submersible pump motor; the water seepage detection voltage sampling unit comprises an input terminal used for externally-connected and embedded in a reed switch liquid level inductor in the motor cavity, the input end of a differential amplification circuit of the water seepage detection signal conversion unit is in electrical connection with the output end of the water seepage detection voltage sampling unit, and the output end outputs a frequency signal representing the cavity liquid level to the main controller to process; the main controller compares the frequency signal representing the cavity liquid level with the liquid level relation of the reed switch liquid level inductor, and starts the cavity water seepage output module according to the comparison result. The measuring and protecting device of the utility model at least enables the power supply of the submersible pump motor to be cut-off in time when the cavity water seepage occurs, so that the submersible pump motor stops working, and the workers can be noticed in time for emergency repair.
Description
Technical field
The utility model relates to a kind of running status through detecting the immersible pump motor to its device of protecting.
Background technology
In food processing, papermaking, brewage, occasion such as the dreg slurry of industrial enterprise such as iron and steel, cement is pumped, sewage disposal all need use the immersible pump motor; The measurement protective device of existing immersible pump motor only relates to the voltage detecting circuit of phase voltage and the current detection circuit of phase current, still, and for the immersible pump motor; It is far from being enough that overvoltage and overcurrent protection are only arranged; Because the particularity of immersible pump motor operational environment, it is very important that the infiltration of its cavity detects, if infiltration appears in cavity or overload will cause immersible pump to work; If in time do not break off the immersible pump motor at this moment; To cause bigger infringement to the immersible pump motor, even can cause the cable electric leakage, and bring great loss for enterprise or personal safety.
The utility model content
The utility model provides a kind of measurement protective device that the cavity infiltration detects that can carry out at least in order to address the above problem.
The technical scheme that the utility model adopts is: a kind of measurement protective device of immersible pump motor; Comprise main controller and cavity infiltration detection module; Said cavity infiltration detection module comprises that an infiltration detects a voltage sample unit and a signal conversion unit as infiltration detection signal converting unit, and one be used to break off the immersible pump motor cavity infiltration output module;
Said infiltration detects the voltage sample unit and has the input terminal that is used for external pre-buried tongue tube level sensor in the motor cavity, and the variation of the output voltage that detects the voltage sample unit to pass through to seep water characterizes the resistance variations of tongue tube level sensor;
Said signal conversion unit comprises differential amplifier circuit, frequency to voltage converter, optocoupler and switching tube; The output of said differential amplifier circuit is electrically connected with the comparison input of frequency to voltage converter; The frequency output terminal of said frequency to voltage converter is connected with the cathodic electricity of the light-emitting diode of optocoupler; First voltage output end is electrically connected with the anode of the light-emitting diode of optocoupler, and is electrically connected with frequency output terminal; Second voltage output end, one branch road is electrically connected with the collector electrode of the sensitization triode of optocoupler; Another branch road is electrically connected with the emitter as the signal conversion unit output of switching tube; The collector electrode of sensitization triode is electrically connected with the base stage of switching tube, the emitter of sensitization triode and the equal ground connection of the collector electrode of switching tube;
The input of the differential amplifier circuit of said infiltration detection signal converting unit and infiltration detect corresponding electricals connection of output of voltage sample unit, and the output of infiltration detection signal converting unit is exported in frequency signal to the main controller of sign cavity liquid level and handled.
Preferably, said cavity infiltration output module adopts the relay output circuit, and said relay output circuit comprises relay, and the coil of relay is electrically connected between the infiltration signal output port of tertiary voltage output and main controller; The normally opened contact of said relay is electrically connected on two and is used to make between the cavity infiltration output module execution lead-out terminal parallelly connected with the immersible pump motor.
Preferably; The measurement protective device of immersible pump motor also comprises the electromotor winding temperature detection module; Said electromotor winding temperature detection module comprises that a winding temperature detects voltage sample unit and another signal conversion unit as the winding temperature signal conversion unit, and one be used to break off the immersible pump motor the overheated output module of winding;
Said winding temperature detects the voltage sample unit and has the input terminal that is used for corresponding electricals connection of output of the PTC transducer of pre-buried three series connection in the motor winding, with the resistance variations of the variation sign PTC transducer of the output voltage through winding temperature detection voltage sample unit; Winding temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of winding temperature detection signal converting unit of voltage sample unit, handles in frequency signal to the main controller of the output output sign winding temperature of winding temperature detection signal converting unit.
Preferably; The measurement protective device of said immersible pump motor also comprises the bearing of motor temperature detecting module; Said bearing of motor temperature detecting module comprises that a bearing temperature detects voltage sample unit and another signal conversion unit as the bearing temperature signal conversion unit; And one is used to break off the bearing running hot output module of immersible pump motor;
Said bearing temperature detects the voltage sample unit and has the input terminal that is used for pre-buried corresponding electricals connection of output in the PTC of bearing of motor transducer, with the resistance variations of the variation sign PTC transducer of the output voltage through bearing temperature detection voltage sample unit; Bearing temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of bearing temperature detection signal converting unit of voltage sample unit, handles in frequency signal to the main controller of the output output sign bearing temperature of bearing temperature detection signal converting unit.
The beneficial effect of the utility model is: the measurement protective device of the utility model can in time cut off the power supply of immersible pump motor at least when cavity seeps water; It is quit work; And in time notify the staff to rush to repair; Its cavity infiltration detection module adopts the mode that converts voltage signal into frequency signal to help main controller to carry out analyzing and processing, make judgement promptly and accurately.
Description of drawings
Fig. 1 shows a kind of circuit structure of execution mode of the voltage detection module of the said measurement protective device of the utility model;
Fig. 2 shows a kind of circuit structure of execution mode of the current detection module of the said measurement protective device of the utility model;
Fig. 3 shows a kind of circuit structure of execution mode of the bearing of motor temperature detecting module of the said measurement protective device of the utility model;
Fig. 4 shows a kind of circuit structure of execution mode of the cavity infiltration detection module of the said measurement protective device of the utility model;
Fig. 5 shows a kind of circuit structure of execution mode of the electronic winding temperature detection module of the said measurement protective device of the utility model;
Fig. 6 shows the circuit structure of a kind of execution mode of the relay output module that the said measurement protective device of the utility model uses.
Embodiment
Below in conjunction with embodiment the utility model is described in further detail, but the execution mode of the utility model is not limited thereto.
The said measurement protective device of the utility model mainly comprises cavity infiltration detection module as shown in Figure 4; It comprises that infiltration detects voltage sample unit and infiltration detection signal converting unit; This infiltration detects the input terminal LLS1 of voltage sample unit; The external pre-buried tongue tube level sensor in the motor cavity of LLS2, and then the resistance variations of gathering the tongue tube level sensor; This infiltration detection signal converting unit adopts following signal conversion unit; Signal conversion unit comprises differential amplifier circuit, frequency to voltage converter U17, optocoupler U32 and switching tube Q1; The output of this differential amplifier circuit is electrically connected with the comparison input VIN of frequency to voltage converter U17; The frequency output terminal FOUT of this frequency to voltage converter U17 is connected with the cathodic electricity of the light-emitting diode of optocoupler U32; First voltage output end (12V voltage is provided in the present embodiment) is electrically connected through the anode of resistance R 98 with the light-emitting diode of optocoupler U32, and is electrically connected with frequency output terminal FOUT through resistance R 101; Second voltage output end (3.3V voltage is provided in a present embodiment) branch road is electrically connected through the collector electrode of resistance R 100 with the sensitization triode of optocoupler U32; Another branch road is electrically connected with the emitter as the signal conversion unit output of switching tube Q1 through resistance R 103; The collector electrode of sensitization triode is electrically connected through the base stage of resistance R 102 with switching tube Q1, the equal ground connection of collector electrode of the emitter of sensitization triode and switching tube Q1.The corresponding electrical connection of output of the input of the differential amplifier circuit of infiltration detection signal converting unit and infiltration detection voltage sample unit; The frequency signal PWM_1 that the output of infiltration detection signal converting unit (also being the output of cavity infiltration detection module) output characterizes the cavity liquid level handles to main controller; Main controller compares the liquid level relation of frequency signal PWM_1 and tongue tube level sensor; When comparative result is represented the cavity infiltration; Main controller will suddenly stop through cavity infiltration output module control immersible pump motor, and report to the police simultaneously, notify the staff to rush to repair.
Other pin of this frequency to voltage converter U17 (for example being that model is the frequency to voltage converter of LM331); As meet the pin R/C of RC timing circuit; The pin RS of input reference electric current, electric current output pin CO, and threshold value pin VX etc.; All can adopt conventional peripheral circuit, no longer specify at this.
This cavity infiltration output module can adopt relay output circuit as shown in Figure 6; This relay output circuit comprises relay; The coil K4-B of relay is electrically connected between two power supply terminals; At this, all right reversal connection and coil K4-B diode connected in parallel D6 between other power supply terminal supply coil K4-8 back discharge; The normally opened contact K4-A of this relay is electrically connected on two and carries out lead-out terminal J8-1, between the J8-2.(output in the present embodiment+5V) the infiltration signal output port RLY-4 with main controller is electrically connected two power supply terminals of this cavity infiltration output module with the tertiary voltage output respectively; This cavity infiltration output module can be carried out lead-out terminal J8-1 through it; J8-2 and immersible pump motor (for example its control loop) are parallel between the power supply, like this, and after main controller is known the cavity infiltration; Will be in infiltration signal output port RLY-4 output low level; It is electric that the relay of cavity infiltration output module is got, and then with the control loop short circuit, the immersible pump motor is in a safe condition.
In addition, this relay output circuit can be carried out lead-out terminal J8-1 at two, is electrically connected the series circuit of capacitor C 84 and resistance R 48 between the J8-2.
This infiltration detects the voltage sample unit can comprise two thermistor R1, R2 and two Transient Suppression Diodes (TVS) Z1, Z2; First voltage output end is in order through two Transient Suppression Diode Z1; Z2 and resistance R 30 ground connection (AGND), wherein, two Transient Suppression Diode Z1; The anode of Z2 is electrically connected, and ground connection; This input terminal LLS1 is electrically connected with first voltage output end (also being the negative electrode of Transient Suppression Diode Z1) through thermistor R1, and input terminal LLS2 is connected with the cathodic electricity of Transient Suppression Diode Z2 through thermistor R2.The hot end of resistance R 30 and earth terminal detect the voltage sample unit as infiltration output is electrically connected with the input of the differential amplifier circuit of infiltration detection signal converting unit, and wherein, this resistance R 30 can be parallelly connected with a capacitor C 5, to carry out filtering.
This differential amplifier circuit can comprise two operational amplifier U31-B; U31-A; The homophase of operational amplifier U31-B and inverting input detect the output of voltage sample unit, the i.e. hot end of resistance R 30 and earth terminal electrical connection with infiltration through resistance R 116 and R104 are corresponding respectively as the input of differential amplifier circuit; The inverting input of operational amplifier U31-B is electrically connected with its output through the parallel circuits of capacitor C 67 and resistance R 105; The output of operational amplifier U31-B is electrically connected with the in-phase input end of operational amplifier U31-A; The inverting input of operational amplifier U31-A is through resistance R 120 ground connection, and is electrically connected with its output through resistance R 106.The output of this operational amplifier U31-A is electrically connected with the comparison input VIN of frequency to voltage converter U17 through resistance R 86 as the output of differential amplifier circuit.
This measurement protective device can also comprise the described electromotor winding temperature detection module like Fig. 5; This electromotor winding temperature detection module comprises that winding temperature detects voltage sample unit and winding temperature signal conversion unit; The above-mentioned signal conversion unit of the same employing of this winding temperature signal conversion unit; This winding temperature detects the input terminal OUT2-of voltage sample unit; The corresponding electrical connection of output of OUT2+ and the PTC transducer of pre-buried three series connection in the motor winding, three PTC wherein and the corresponding one by one configuration of three phase windings.Winding temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of winding temperature detection signal converting unit of voltage sample unit; The frequency signal PWM_2 that the output output of winding temperature detection signal converting unit characterizes winding temperature handles to main controller; (resistance of PTC transducer is big more with different resistances with frequency signal PWM_2 for main controller; It is high more to characterize temperature) frequency signal compare, when comparative result representes that winding temperature surpasses the winding temperature set point, main controller will be through anxious the stopping of the overheated output module control of winding immersible pump motor; And report to the police simultaneously, notify the staff to rush to repair.
The overheated output module of this winding also can adopt relay output circuit as shown in Figure 6; (output in the present embodiment+5V) the winding heat alarm output port with main controller is electrically connected two power supply terminals of the overheated output module of this winding with the tertiary voltage output respectively; The overheated output module of this winding can be carried out lead-out terminal J8-1 through it, and the control loop of J8-2 and immersible pump motor is parallel between the power supply.It is anxious to stop the identical of principle and above-mentioned explanation, is not described further at this.
This winding temperature detects the voltage sample unit and comprises two thermistor R1 ', R2 ' and two Transient Suppression Diodes (TVS) Z1 ', Z2 '; The 4th voltage output end VAN is in order through two resistance R 107; R117 ground connection (AGND), input terminal OUT2-is electrically connected with input terminal OUT2+ through thermistor R1 ', Transient Suppression Diode Z1 ', Transient Suppression Diode Z2 ' and thermistor R2 ' in order, two Transient Suppression Diode Z1 '; The anode of Z2 ' is electrically connected, and ground connection; The negative electrode of Transient Suppression Diode Z1 ' is electrically connected through the hot end of resistance R 118 with resistance R 117, and the negative electrode of Transient Suppression Diode Z2 ' is through resistance R 119 ground connection.The hot end of resistance R 117 and earth terminal are electrically connected with the input of the differential amplifier circuit of winding temperature detection signal converting unit as the output of winding temperature voltage sample unit.
This measurement protective device can also comprise the bearing of motor temperature detecting module; As shown in Figure 3; This bearing of motor temperature detecting module comprises that bearing temperature detects voltage sample unit and bearing temperature signal conversion unit; This bearing temperature signal conversion unit is same to adopt above-mentioned signal conversion unit, and this bearing temperature detects the input terminal PT100-1 of voltage sample unit, the corresponding electrical connection of output of PT100-2 and pre-buried PTC transducer in bearing of motor.Bearing temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of bearing temperature detection signal converting unit of voltage sample unit; The frequency signal PC13 that the output output of bearing temperature detection signal converting unit characterizes bearing temperature handles to main controller; (resistance of PTC transducer is big more with different resistances with frequency signal PC13 for main controller; It is high more to characterize temperature) frequency signal compare, when comparative result representes that bearing temperature surpasses the bearing temperature set point, main controller will be through anxious the stopping of bearing running hot output module control immersible pump motor; And report to the police simultaneously, notify the staff to rush to repair.
This bearing running hot output module also can adopt relay output circuit as shown in Figure 6; (output in the present embodiment+5V) the bearing running hot signal output port with main controller is electrically connected two power supply terminals of bearing running hot output module with the tertiary voltage output respectively; This bearing running hot output module can be carried out lead-out terminal J8-1 through it; The control loop of J8-2 and immersible pump motor is parallel between the power supply, and it is anxious to stop the identical of principle and above-mentioned explanation, is not described further at this.
This bearing temperature detects voltage sample unit and can comprise and be electrically connected on input terminal PT100-1, two Transient Suppression Diodes (TVS) Z3 between the PT100-2, and Z4, two Transient Suppression Diode Z3, the anode of Z4 is electrically connected, and ground connection; The 5th voltage output end (2.5V voltage is provided in a present embodiment) branch road is electrically connected with input terminal PT100-1 through resistance R 20, and another branch road is electrically connected with input terminal PT100-2 with R19 through resistance R 18; In addition, input terminal PT100-1 is through resistance R 14 and resistance R 21 ground connection.The hot end of the hot end of resistance R 19 and resistance R 21 is electrically connected with the input of the differential amplifier circuit of bearing temperature detection signal converting unit as the output of bearing temperature voltage sample unit.Wherein, resistance R 21 can be parallelly connected with a capacitor C 13, to carry out filtering.
This measurement protective device also is provided with the voltage detection module that three as shown in Figure 1 being used to detect the phase voltage of three-phase four-wire system; Voltage detection module input terminal J6-10; J6-7 inserts and corresponding phase voltage separately; Two input terminal J6-10 are electrically connected with the series circuit of the parallel circuits of resistance R 12, R18, R19, R22 and R29 and resistance R 21, capacitor C 18 and Transient Suppression Diode D32 between J6-7.The voltage signal UA-1 of the hot end output of resistance R 221 inputs in the voltage acquisition port of main controller, and the cold end of resistance R 221 is electrically connected (like ground connection) with reference potential end VREF.Should be understood that all that these those skilled in the art main controller generally should be through the corresponding voltage signal that receives three voltage detection module outputs of three voltage acquisition ports.Equally, main controller equally can be through adopting the overvoltage output module protection immersible pump motor of relay output circuit as shown in Figure 6.
This measurement protective device also is provided with the current detection module that three as shown in Figure 2 being used to detect the phase current of three-phase four-wire system; The input terminal J6-5 of current detection module; J6-6 inserts and various corresponding phase currents; Input terminal J6-5; Be electrically connected with divider resistance R154 and R56 between the J6-6; The hot end of resistance R 154 is electrically connected with the in-phase input end of operational amplifier U2-A through the switch member U16-A of resistance R 2 with the control signal CHA1 that is controlled by main controller output; The hot end of resistance R 56 is electrically connected with the in-phase input end of operational amplifier U2-A through the switch member U16-B of resistance R 59 with the control signal CHA2 that is controlled by main controller output; The cold end of resistance R 56 is electrically connected through the inverting input of resistance R 152 with operational amplifier U2-A, and the inverting input of operational amplifier U2-A is electrically connected with its output through resistance R 153, and the output of operational amplifier U2-A characterizes the current sample port of the voltage signal IA of phase current size to main controller as the lead-out terminal output of current detection module.Equally, main controller equally can be through adopting the overcurrent output module protection immersible pump motor of relay output circuit as shown in Figure 6.In addition, main controller can be given tacit consent to selection and open switch member U16-B, when it judges that detected electric current is too small, but off switch spare U16-B, and open switch member U16-A.
This input terminal J6-5 can be behind thermistor R11 a branch road through Transient Suppression Diode D19 ground connection; Another branch road is through two first Transient Suppression Diode ground connection that anode is electrically connected; Input terminal J6-5 behind thermistor R20 a branch road through Transient Suppression Diode D2 ground connection; Another branch road is through two second Transient Suppression Diode ground connection that anode is electrically connected, and two first Transient Suppression Diodes and two second Transient Suppression Diodes constitute Transient Suppression Diode group Z1; Above-mentioned divider resistance can be electrically connected between resistance R 11 and the R20, in addition, also can be electrically connected a capacitor C 2 between resistance R 11 and the R20.
Those skilled in the art is all clear, and above-mentioned each thermistor of mentioning all is effects of playing the protection corresponding module with each Transient Suppression Diode, and it is not the functional unit that each module realizes corresponding function.
In addition, for the ease of for PLC provides signal, it is the analogue quantity output circuit of analog quantity output according to the data transaction that respectively collects for the conversion of signals of PWM ripple output that the measurement protective device of the utility model can also dispose controller.
The measurement protective device of the utility model is gathered above-mentioned various protection module, has just constituted the composite measurement protective device, for the immersible pump motor provides omnibearing protection.
Being merely the utility model preferred embodiment in sum, is not the practical range that is used for limiting the utility model, and promptly all equivalences of doing according to the content of the utility model claim change and modify, and all should belong to the technological category of the utility model.
Claims (4)
1. the measurement protective device of an immersible pump motor; It is characterized in that: comprise main controller and cavity infiltration detection module; Said cavity infiltration detection module comprises that an infiltration detects a voltage sample unit and a signal conversion unit as infiltration detection signal converting unit, and one be used to break off the immersible pump motor cavity infiltration output module;
Said infiltration detects the voltage sample unit and has the input terminal that is used for external pre-buried tongue tube level sensor in the motor cavity, and the variation of the output voltage that detects the voltage sample unit to pass through to seep water characterizes the resistance variations of tongue tube level sensor;
Said signal conversion unit comprises differential amplifier circuit, frequency to voltage converter, optocoupler and switching tube; The output of said differential amplifier circuit is electrically connected with the comparison input of frequency to voltage converter; The frequency output terminal of said frequency to voltage converter is connected with the cathodic electricity of the light-emitting diode of optocoupler; First voltage output end is electrically connected with the anode of the light-emitting diode of optocoupler, and is electrically connected with frequency output terminal; Second voltage output end, one branch road is electrically connected with the collector electrode of the sensitization triode of optocoupler; Another branch road is electrically connected with the emitter as the signal conversion unit output of switching tube; The collector electrode of sensitization triode is electrically connected with the base stage of switching tube, the emitter of sensitization triode and the equal ground connection of the collector electrode of switching tube;
The input of the differential amplifier circuit of said infiltration detection signal converting unit and infiltration detect corresponding electricals connection of output of voltage sample unit, and the output of infiltration detection signal converting unit is exported in frequency signal to the main controller of sign cavity liquid level and handled.
2. the measurement protective device of immersible pump motor according to claim 1; It is characterized in that: said cavity infiltration output module adopts the relay output circuit; Said relay output circuit comprises relay, and the coil of relay is electrically connected between the infiltration signal output port of tertiary voltage output and main controller; The normally opened contact of said relay is electrically connected on two and is used to make between the cavity infiltration output module execution lead-out terminal parallelly connected with the immersible pump motor.
3. the measurement protective device of immersible pump motor according to claim 1; It is characterized in that: also comprise the electromotor winding temperature detection module; Said electromotor winding temperature detection module comprises that a winding temperature detects voltage sample unit and another signal conversion unit as the winding temperature signal conversion unit, and one be used to break off the immersible pump motor the overheated output module of winding;
Said winding temperature detects the voltage sample unit and has the input terminal that is used for corresponding electricals connection of output of the PTC transducer of pre-buried three series connection in the motor winding, with the resistance variations of the variation sign PTC transducer of the output voltage through winding temperature detection voltage sample unit; Winding temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of winding temperature detection signal converting unit of voltage sample unit, handles in frequency signal to the main controller of the output output sign winding temperature of winding temperature detection signal converting unit.
4. the measurement protective device of immersible pump motor according to claim 1; It is characterized in that: also comprise the bearing of motor temperature detecting module; Said bearing of motor temperature detecting module comprises that a bearing temperature detects voltage sample unit and another signal conversion unit as the bearing temperature signal conversion unit; And one is used to break off the bearing running hot output module of immersible pump motor;
Said bearing temperature detects the voltage sample unit and has the input terminal that is used for pre-buried corresponding electricals connection of output in the PTC of bearing of motor transducer, with the resistance variations of the variation sign PTC transducer of the output voltage through bearing temperature detection voltage sample unit; Bearing temperature detects the corresponding electrical connection of input of output with the differential amplifier circuit of bearing temperature detection signal converting unit of voltage sample unit, handles in frequency signal to the main controller of the output output sign bearing temperature of bearing temperature detection signal converting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202860324U CN202268679U (en) | 2011-08-08 | 2011-08-08 | Measuring and protecting device of submersible pump motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202860324U CN202268679U (en) | 2011-08-08 | 2011-08-08 | Measuring and protecting device of submersible pump motor |
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| Publication Number | Publication Date |
|---|---|
| CN202268679U true CN202268679U (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202860324U Expired - Lifetime CN202268679U (en) | 2011-08-08 | 2011-08-08 | Measuring and protecting device of submersible pump motor |
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| CN (1) | CN202268679U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290788A (en) * | 2011-08-08 | 2011-12-21 | 深圳市亚特尔科技有限公司 | Measurement protective device of submersible pump motor |
-
2011
- 2011-08-08 CN CN2011202860324U patent/CN202268679U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290788A (en) * | 2011-08-08 | 2011-12-21 | 深圳市亚特尔科技有限公司 | Measurement protective device of submersible pump motor |
| CN102290788B (en) * | 2011-08-08 | 2014-01-29 | 深圳市亚特尔科技有限公司 | Measurement protective device of submersible pump motor |
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