CN201730825U - Speed monitoring and protection device of screw rod pump - Google Patents
Speed monitoring and protection device of screw rod pump Download PDFInfo
- Publication number
- CN201730825U CN201730825U CN2009202795582U CN200920279558U CN201730825U CN 201730825 U CN201730825 U CN 201730825U CN 2009202795582 U CN2009202795582 U CN 2009202795582U CN 200920279558 U CN200920279558 U CN 200920279558U CN 201730825 U CN201730825 U CN 201730825U
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- speed
- gear
- screw pump
- gearbox gear
- signal
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Abstract
The utility model discloses a speed monitoring and protection device of a screw rod pump, which can be used for the fault protection of the overquick and overslow speed of the screw rod pump driven by a motor. The utility model has the structural characteristics of simple structure, fewer parts, low cost, and easy integration with a motor control system. The utility model is used for monitoring and protecting the screw rod pump driven by any motor. The rotation speed signal of a gear of a gear box of a screw rod pump is transmitted to a central processor through a proximity switch, through setting the speed upper limit and the speed lower limit of the gear of the gear box, according to the signal transmitted by the proximity switch, the program of the central processor computes and monitors the speed of the gear of the gear box of the screw rod pump, when the speed is over the speed upper limit or under the speed lower limit of the gear of the gear box of the gear box, the central processor sends commands, indicates faults and sends a relay protection signal to the whole control system.
Description
Technical field
The utility model relates to a kind of speed of screw pump monitoring and protective gear, and specifically at speed of screw pump monitoring and guard method thereof, it can be used for the too fast and slow error protection of mistake of speed of screw pump that heavy-duty motor drives.
Background technique
Screw pump is to utilize the revolution of screw rod to come suction liquid.Middle screw rod is the active screw rod, drives revolution by prime mover, and the screw rod on both sides is driven screw rod, does counterrotating with the active screw rod.Driving and driven screw flight is double thread screw.
Because being meshing with each other of each screw rod and closely cooperating of screw rod and lining inwall between pump intake and exhaust port, will be separated into one or more seal spacies.Along with the rotation and the engagement of screw rod, these seal spacies constantly form in the suction side of pump, wherein liquid-filled with in the suction chamber, and pass continuously to exhaust end along screw axial from suction chamber, the liquid that is enclosed in each space is constantly discharged.
Screw pump may block or some other fault owing to some reasons cause in the application of various reality.Such as pumping unit is the main production equipments of recovering the oil in the oil field, and the oil field overwhelming majority of China will press oil to go into well by water filling, by pumping unit oil is elevated from the stratum.When sand plug took place in short-term in the down-hole, various situations can appear in oil well, caused piston card, valve card, made the oil-pumping screw pump cisco unity malfunction or oil pipe is blocked such as oil well paraffinication; Sand card, sand plug; The dropout of sucker rod; The fracture of sucker rod or the like a variety of causes.
So by speed monitoring and protective gear, screw pump is monitored and protected very important.The protective gear of existing screw pump all is the protection of relevant mechanical aspects; such as adding transmission shaft; mechanical structures such as translation slide mechanism and thrust bearing mechanism come screw pump is protected, and lack the device that the speed of screw pump is carried out real-time electric monitoring and protection.
The model utility content
At the above-mentioned problems in the prior art, the utility model proposes a kind of speed of screw pump monitoring and protective gear.
The utility model is specifically by the following technical solutions:
A kind of speed of screw pump monitoring and protective gear; comprise screw pump gearbox gear velocity checking circuits, central processing unit (CPU) 13, three phase relaies 3 and relay drive circuit 6; wherein said three phase relaies 3 are serially connected in the power loop of electric machine controller 2 and three phase electric machine 4, it is characterized in that:
Screw pump gearbox gear velocity checking circuits comprises photoelectricity coupling testing circuit 7 and near switch 8, input end near switch 8 signal output parts and described photoelectricity coupling testing circuit 7 links to each other, is used to detect the gearbox gear pulse signal that the gear of gearbox is close to be sent when moving in a circle near switch;
The output terminal of the screw pump gearbox gear velocity checking circuits 7 gearbox gear pulse signal that will detect that links to each other with the input end of central processing unit (CPU) 13 is uploaded to described central processing unit (CPU) 13, calculates gearbox gear speed in central processing unit (CPU) 13;
The output of described central processing unit (CPU) 13 links to each other with described relay drive circuit 6, is used for disconnecting to relay drive circuit 6 output relay control signals according to gearbox gear speed controlling three phase relaies 3, thus three phase electric machine 4 and load thereof.
When the gear of gearbox 5 when moving in a circle near switch 8; near switching signal anode 9 and near the pulse signal that will send high-low level between the switching signal negative terminal 10; photoelectricity coupling testing circuit 7 will be gearbox gear pulse signal 12 and deliver to central processing unit (CPU) 13 that gearbox gear speed 14 be counted and calculate and be obtained to the speed of screw pump monitoring of central processing unit (CPU) 13 inside will to gearbox gear pulse signal 12 with defence program 15 near switching signal anode 9 and near the further treatment conversion of high-low level pulse signal of sending between the switching signal negative terminal 10.Speed monitoring and defence program 15 compare gearbox gear speed 14 and gearbox gear speed limit 16 and gearbox gear lower velocity limit 17 and output relay control signal 11; the relay control signal 11 of described central processing unit (CPU) 13 links to each other with relay drive circuit 6; when the central processing unit (CPU) 13 gearbox gear speed 14 that calculates is higher than gearbox gear speed limit 16 or is lower than gearbox gear lower velocity limit 17; the relay control signal 11 that described central processing unit (CPU) 13 is exported is high level; the high level signal that relay control signal 11 is exported is to relay drive circuit 6; control three phase relaies 3 and disconnect, thus protection heavy-duty motor and load thereof.
This speed of screw pump monitoring and protective gear can be used for the too fast and slow error protection of mistake of speed of screw pump that heavy-duty motor drives.Be characterized in simple in structure, device seldom, cost is low, is very easy to carry out integrated with whole electric machine control system.
The utility model be used for any motor with the speed monitoring and the protection of screw pump.By screw pump gearbox gear pulse signal 12 being sent to central processing unit (CPU) 13 near switch 8 and photoelectricity coupling testing circuit 7; by control panel gearbox gear speed limit 16 and gearbox gear lower velocity limit 17 are set; according to screw pump gearbox gear speed pulse signal 12; the central processing unit (CPU) program is by counting and calculate screw pump gearbox gear speed 14; when gearbox gear speed 14 is higher than gearbox gear speed limit 16 or is lower than gearbox gear lower velocity limit 17; central processing unit (CPU) 13 the relay control signal that sends 11 will be low level; by relay drive circuit 6; control relay 3 turn-offs, protection motor and load thereof.
By speed of screw pump monitoring and protective gear; the screw pump that motor drove is in excessive velocities; speed is crossed when waiting fault slowly; the screw pump monitoring will effectively detect trouble signal rapidly with protective gear; and operational outfit protected; prevent to damage motor, screw pump and other device that they connected, can prolong the working life of screw pump and accessory thereof effectively.
Description of drawings
Monitoring of Fig. 1 speed of screw pump and protective gear system connection diagram;
Fig. 2 photoelectricity coupling testing circuit figure;
Monitoring of Fig. 3 speed of screw pump and defence program block diagram;
Fig. 4 relay drive circuit figure.
Embodiment
As shown in Figure 1, the raw material of the gear 5 of volute pump gearbox is an iron, when screw pump is worked, gearbox gear 5 is made circular movement, when gearbox gear 5 near near switch 8 time, to induce rate signal anode 9 near switch 8 and be the signal of high level with respect to rate signal negative terminal 10, when gearbox gear 5 leaves near switch, to induce rate signal anode 9 near switch 8 and be low level signal with respect to rate signal negative terminal 10, by the continuous circular movement of gearbox gear 5, a series of high level and low level pulse signal are sent to photoelectricity coupling testing circuit 7 near switch 8.Conversion by photoelectricity coupling testing circuit 7; screw pump gearbox gear speed pulse signal 12 send passes to central processing unit (CPU) 13; central processing unit (CPU) 13 will be counted and calculate actual gearbox speed 14 by speed of screw pump monitoring and defence program 15 fast case gear speed pulse signal 12; gearbox speed 14 compares judgement in the time of will be with gearbox gear speed limit 16 and gearbox gear lower velocity limit 17; when gearbox speed 14 is lower than gearbox gear speed limit 16 and is higher than gearbox gear lower velocity limit 17; relay control signal 11 is output as low level, at this moment three phase relaies, 3 closures.When gearbox speed 14 was higher than gearbox gear speed limit 16 or is lower than gearbox gear lower velocity limit 17, relay control signal 11 was output as high level, and three phase relaies 3 are opened, thus protection heavy-duty motor, screw pump and load thereof.Described central processing unit (CPU) 13 can use DSP or FPGA.
As shown in Figure 2, described photoelectricity coupling testing circuit comprises photo coupler 18, current-limiting resistance 19 and output pull-up resistor 22, near the anode of switching signal anode 9 by current-limiting resistance 19 sending and receiving optical diodes 20, negative electrode near switching signal negative terminal 10 sending and receiving light diodes 20, described output pull-up resistor 22 is connected between the collector electrode and positive supply of illuminated triode 21, when when being high level with respect to signal negative terminal 10 near switch 8 sensed signal anodes 9, the gearbox gear pulse signal 12 of output is a low level, when signal anode 9 was low level with respect to signal negative terminal 10, the gearbox gear pulse signal 12 of output was a high level.Wherein current-limiting resistance 19 0.01 ohm between 100 megohms, pull-up resistor 22 0.01 ohm between 100 megohms, jump on the photo coupler 18 along and jump down along time-delay between 1n second to 1 second.
As shown in Figure 3, when central processing unit (CPU) 13 detects gearbox gear pulse signal 12 when high level jumps to low level, interruption subroutine brings into operation, at first preserve gearbox gear speed limit 16 and the gearbox gear lower velocity limit 17 that sets in advance, and judge whether counter is zero, if counter is 0, be the time reference value then with the counter assignment, calculate gearbox gear speed 14 then, when gearbox speed 14 was lower than gearbox gear speed limit 16 and is higher than gearbox gear lower velocity limit 17, relay control signal 11 was output as low level.When gearbox speed 14 was higher than gearbox gear speed limit 16 or is lower than gearbox gear lower velocity limit 17, relay control signal 11 was output as high level.If counter is greater than zero, at first counter is from subtracting 1, and the speed checkout value turns back to main program then from adding 1 then, waits for interruption subroutine operation next time.
Figure 4 shows that relay drive circuit 6, when relay control signal 11 is high level, light emitting diode 24 conductings are luminous, illuminated triode 26 is open-minded, illuminated triode 26 collector electrodes are by pull-up resistor 27 output low levels, device for power switching MOSFET 28 turn-offs, and three phase relay equivalent coil resistance, 31 no currents pass through, and three phase relaies 3 disconnect.When relay control signal 11 is low level, light emitting diode 24 not conductings, illuminated triode 26 is not opened logical, the collector electrode of illuminated triode 26 is by pull-up resistor 27 output high level, device for power switching MOSFET 28 is open-minded, three phase relay equivalent coil resistance 31 have electric current to pass through, three phase relaies, 3 closures.
Claims (4)
1. a speed of screw pump is monitored and protective gear; comprise screw pump gearbox gear velocity checking circuits, central processing unit (CPU), three phase relaies and relay drive circuit; wherein said three phase relaies are serially connected in the power loop of electric machine controller and three phase electric machine, it is characterized in that:
Screw pump gearbox gear velocity checking circuits comprises photoelectricity coupling testing circuit and near switch, input end near switching signal output terminal and described photoelectricity coupling testing circuit links to each other, is used to detect the gearbox gear pulse signal that the gear of gearbox is close to be sent when moving in a circle near switch;
The output terminal of the screw pump gearbox gear velocity checking circuits gearbox gear pulse signal that will detect that links to each other with the input end of central processing unit (CPU) is uploaded to described central processing unit (CPU), calculates gearbox gear speed in central processing unit (CPU);
The output of described central processing unit (CPU) links to each other with described relay drive circuit, is used for disconnecting to relay drive circuit output relay control signal according to gearbox gear speed controlling three phase relaies, thus protection heavy-duty motor and load thereof.
2. speed of screw pump monitoring according to claim 1 and protective gear; it is characterized in that: described photoelectricity coupling testing circuit comprises photo coupler; current-limiting resistance and output pull-up resistor; near the anode of switching speed signal anode by current-limiting resistance sending and receiving optical diode; negative electrode near switching speed signal negative terminal sending and receiving light diode; described output pull-up resistor is connected between the collector electrode and positive supply of illuminated triode; when being high level with respect to the rate signal negative terminal by speed pulse signal anode near switch senses; the gearbox gear pulse signal that photo coupler is exported is a low level; when near switching speed signal anode when being low level near switching speed signal negative terminal, the gearbox gear pulse signal of output is a high level.
3. according to right 1 described speed of screw pump monitoring and protective gear, it is characterized in that: described central processing unit (CPU) is selected DSP or FPGA for use.
4. speed of screw pump monitoring according to claim 2 and protective gear; it is characterized in that: wherein current-limiting resistance at 0.01 ohm between 100 megohms; pull-up resistor 0.01 ohm between 100 megohms, jump on the photo coupler along and jump down along time-delay between 1n second to 1 second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202795582U CN201730825U (en) | 2009-11-06 | 2009-11-06 | Speed monitoring and protection device of screw rod pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202795582U CN201730825U (en) | 2009-11-06 | 2009-11-06 | Speed monitoring and protection device of screw rod pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201730825U true CN201730825U (en) | 2011-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202795582U Expired - Fee Related CN201730825U (en) | 2009-11-06 | 2009-11-06 | Speed monitoring and protection device of screw rod pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201730825U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104350278A (en) * | 2012-04-11 | 2015-02-11 | Itt制造企业有限责任公司 | Method for rotary positive displacement pump protection |
| US10495084B2 (en) | 2012-04-11 | 2019-12-03 | Itt Manufacturing Enterprises Llc | Method for twin screw positive displacement pump protection |
-
2009
- 2009-11-06 CN CN2009202795582U patent/CN201730825U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104350278A (en) * | 2012-04-11 | 2015-02-11 | Itt制造企业有限责任公司 | Method for rotary positive displacement pump protection |
| US9745979B2 (en) | 2012-04-11 | 2017-08-29 | Itt Manufacturing Enterprises Llc | Method for rotary positive displacement pump protection |
| CN104350278B (en) * | 2012-04-11 | 2017-10-10 | Itt制造企业有限责任公司 | The method protected for rotary volume pump |
| US10495084B2 (en) | 2012-04-11 | 2019-12-03 | Itt Manufacturing Enterprises Llc | Method for twin screw positive displacement pump protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20121106 |