CN203430757U - Constant pressure digital variable pump - Google Patents
Constant pressure digital variable pump Download PDFInfo
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- CN203430757U CN203430757U CN201320500994.4U CN201320500994U CN203430757U CN 203430757 U CN203430757 U CN 203430757U CN 201320500994 U CN201320500994 U CN 201320500994U CN 203430757 U CN203430757 U CN 203430757U
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- 239000000945 filler Substances 0.000 claims description 12
- 239000002828 fuel tank Substances 0.000 claims description 6
- 230000004044 response Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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Abstract
The utility model relates to a constant pressure digital variable pump and belongs to the technical field of hydraulic transmission. The constant pressure digital variable pump comprises a controller, a frequency converter, a motor, a metering pump, a cartridge valve, a high-speed switch valve, a pressure sensor, an energy accumulator and a check valve, wherein the output end of the controller is connected with the signal receiving end of the frequency converter and the signal receiving end of the high-speed switch valve respectively, the input end of the controller is connected with the output end of the pressure sensor, the output end of the frequency converter is connected with the input end of the motor, the output end of the motor is connected with the metering pump, an oil outlet of the cartridge valve is connected with an oil tank, an oil outlet of the high-speed switch valve is connected with a control cavity of the cartridge valve, an oil outlet of the check valve is connected with an oil inlet of the energy accumulator, an oil outlet of the energy accumulator is connected with an oil inlet of the pressure sensor, and an oil outlet of the pressure sensor is connected with a hydraulic system. According to the constant pressure digital variable pump, working efficiency of the system can be increased, energy is saved, control accuracy of output pressure of the digital variable pump can also be increased, the variable range is wide, and response speed is high.
Description
Technical field
The utility model relates to a kind of constant pressure numerical variable pump based on frequency control of motor speed and the compound control of high-speed switch valve, belongs to hydraulic transmission technology field.
Background technique
Traditional numerical variable pump mainly contains variable speed control and capacity is controlled two kinds.Variable speed control figure variable displacement pump is incoming frequency and the voltage that relies on Frequency Converter Control motor power, changes the rotating speed of motor, realizes the control of oil hydraulic pump delivery pressure.This control mode rotary inertia is large, dynamic response is slow, and cannot realize the zero pressure output of system.Capacity control figure variable displacement pump is to control executive component action according to the feedback signal of Detecting element, the stroking mechanism position of variable displacement pump is changed, thereby change the volume of numerical variable pump, realizes the change of variable displacement pump delivery pressure.This control mode oil hydraulic circuit is comparatively complicated, poor reliability, and range of variables is subject to stroking mechanism restriction, range of variables is narrower, speed of response is slow.Above-mentioned two kinds of control modes all exist dynamic response slow, and the narrow deficiency that waits of range of variables, is seriously restricting the lifting of digital hydraulic control system performance.
Summary of the invention
The purpose of this utility model is to provide the numerical variable pump that a kind of constant pressure is controlled, to overcome the defect that existing numerical variable pump speed of response is slow, range of variables is narrow.
The utility model is realized by following technological scheme: a kind of constant pressure numerical variable pump, comprises controller 1, frequency variator 2, motor 3, metering pump 4, cartridge valve 5, high-speed switch valve 6, pressure transducer 7, accumulator 8 and one-way valve 9, controller 1 and frequency variator 2, motor 3 forms the variable frequency regulating speed control part of numerical variable pump, controller 1 and cartridge valve 5, high-speed switch valve 6 forms the Speed On-off Valve part of numerical variable pump, the output terminal of controller 1 respectively with frequency variator 2, the signal receiving end of high-speed switch valve 6 connects, the input end of controller 1 is connected with the output terminal of pressure transducer 8, the output terminal of frequency variator 2 is connected with the input end of motor 3, the output terminal of motor 3 is connected with metering pump 4 by coupling, the filler opening of metering pump 4 is connected with fuel tank by oil pipe, the oil outlet of metering pump 4 is by the oil pipe one-way valve 9 that is connected in parallel, cartridge valve 5, the filler opening of high-speed switch valve 6, the oil outlet of cartridge valve 5 is connected with fuel tank by oil pipe, the oil outlet of high-speed switch valve 6 is connected with the control chamber of cartridge valve 5 by oil pipe, the oil outlet of one-way valve 9 is connected with the filler opening of accumulator 8 by oil pipe, the oil outlet of accumulator 8 is connected with the filler opening of pressure transducer 7 by oil pipe, the oil outlet of pressure transducer 7 is connected with hydraulic system.
A kind of working principle of constant pressure numerical variable pump is: during work, controller 1 is controlled the output signal of frequency variator 2 according to the feedback signal of pressure transducer 7, regulate the input speed of motor 3 and the input signal of high-speed switch valve 6, realize the constant of numerical variable pump delivery pressure.When system demand pressure increases, controller 1 receives the feedback signal of pressure transducer 7, by deducing and calculation process, increases the rotating speed of motor 1, high-speed switch valve 6 energisings simultaneously, and cartridge valve 5 spools are closed; When system demand pressure reduces, controller 1 receives the feedback signal of pressure transducer 7, by deducing and calculation process, reduces the rotating speed of motor 3, reduces the current"on"time of high-speed switch valve 6 simultaneously, and cartridge valve 5 delivery pressures increase; When system demand pressure is during lower than delivery pressure under metering pump 4 minimum stable engine speeds, the input signal that controller 1 is controlled frequency variator 2 moves motor 3 under minimum stabilized (steady-state) speed, simultaneously, controller 1 receives the feedback signal of pressure transducer 7, by deducing and calculation process, control in real time the power on/off time of high-speed switch valve 6, regulate the openings of sizes of cartridge valve 5 spools, realize response fast, reach the object that constant pressure is controlled.
The utlity model has following beneficial effect:
1,, by the input speed of Frequency Converter Control oil hydraulic pump, can increase the working efficiency of system, energy saving;
2, adopt three grades of closed loop controls: one-level is the feedback control of controller and pressure transducer output signal, secondary is the feedback control of controller and motor input speed, three grades is the feedback control of controller and high-speed switch valve input signal, can increase the control accuracy of numerical variable pump delivery pressure;
3, this numerical variable pump oil hydraulic circuit is simple, adopts high-speed switch valve as the pilot control element of cartridge valve, can complete the zero pressure output that variable speed control figure variable displacement pump cannot be realized, and range of variables is wide, and fast response time.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure, each label is: 1: controller, 2: frequency variator, 3: motor, 4: metering pump, 5: cartridge valve, 6: high-speed switch valve, 7: pressure transducer, 8: accumulator, 9: one-way valve.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, but content of the present utility model is not limited to described scope.
Embodiment 1: as shown in Figure 1, a kind of constant pressure numerical variable pump, comprises controller 1, frequency variator 2, motor 3, metering pump 4, cartridge valve 5, high-speed switch valve 6, pressure transducer 7, accumulator 8 and one-way valve 9, the output terminal of controller 1 respectively with frequency variator 2, the signal receiving end of high-speed switch valve 6 connects, the input end of controller 1 is connected with the output terminal of pressure transducer 8, the output terminal of frequency variator 2 is connected with the input end of motor 3, the output terminal of motor 3 is connected with metering pump 4 by coupling, the filler opening of metering pump 4 is connected with fuel tank by oil pipe, the oil outlet of metering pump 4 is by the oil pipe one-way valve 9 that is connected in parallel, cartridge valve 5, the filler opening of high-speed switch valve 6, the oil outlet of cartridge valve 5 is connected with fuel tank by oil pipe, the oil outlet of high-speed switch valve 6 is connected with the control chamber of cartridge valve 5 by oil pipe, the oil outlet of one-way valve 9 is connected with the filler opening of accumulator 8 by oil pipe, the oil outlet of accumulator 8 is connected with the filler opening of pressure transducer 7 by oil pipe, the oil outlet of pressure transducer 7 is connected with hydraulic system.
Claims (1)
1. a constant pressure numerical variable pump, is characterized in that: comprise controller (1), frequency variator (2), motor (3), metering pump (4), cartridge valve (5), high-speed switch valve (6), pressure transducer (7), accumulator (8) and one-way valve (9), the output terminal of controller (1) respectively with frequency variator (2), the signal receiving end of high-speed switch valve (6) connects, the input end of controller (1) is connected with the output terminal of pressure transducer (8), the output terminal of frequency variator (2) is connected with the input end of motor (3), the output terminal of motor (3) is connected with metering pump (4), the filler opening of metering pump (4) is connected with fuel tank, the oil outlet of metering pump (4) one-way valve (9) that is connected in parallel, cartridge valve (5), the filler opening of high-speed switch valve (6), the oil outlet of cartridge valve (5) is connected with fuel tank, the oil outlet of high-speed switch valve (6) is connected with the control chamber of cartridge valve (5), the oil outlet of one-way valve (9) is connected with the filler opening of accumulator (8), the oil outlet of accumulator (8) is connected with the filler opening of pressure transducer (7), the oil outlet of pressure transducer (7) is connected with hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320500994.4U CN203430757U (en) | 2013-08-16 | 2013-08-16 | Constant pressure digital variable pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320500994.4U CN203430757U (en) | 2013-08-16 | 2013-08-16 | Constant pressure digital variable pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203430757U true CN203430757U (en) | 2014-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320500994.4U Expired - Fee Related CN203430757U (en) | 2013-08-16 | 2013-08-16 | Constant pressure digital variable pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203430757U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019006A (en) * | 2014-06-16 | 2014-09-03 | 福州大学 | Plunger pump variable displacement mechanism control loop |
| CN105041782A (en) * | 2015-06-25 | 2015-11-11 | 西安交通大学 | Numerical variable pump based on multichannel solenoid directional valve binary system flow regulation and control |
| CN107100903A (en) * | 2017-06-29 | 2017-08-29 | 中冶赛迪装备有限公司 | A kind of constant-pressure variable hydraulic power system |
-
2013
- 2013-08-16 CN CN201320500994.4U patent/CN203430757U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019006A (en) * | 2014-06-16 | 2014-09-03 | 福州大学 | Plunger pump variable displacement mechanism control loop |
| CN105041782A (en) * | 2015-06-25 | 2015-11-11 | 西安交通大学 | Numerical variable pump based on multichannel solenoid directional valve binary system flow regulation and control |
| CN107100903A (en) * | 2017-06-29 | 2017-08-29 | 中冶赛迪装备有限公司 | A kind of constant-pressure variable hydraulic power system |
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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: 20140212 Termination date: 20140816 |
|
| EXPY | Termination of patent right or utility model |