CN205154780U - Oil pump constant speed control system - Google Patents
Oil pump constant speed control system Download PDFInfo
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- CN205154780U CN205154780U CN201520975885.7U CN201520975885U CN205154780U CN 205154780 U CN205154780 U CN 205154780U CN 201520975885 U CN201520975885 U CN 201520975885U CN 205154780 U CN205154780 U CN 205154780U
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Abstract
The utility model discloses an oil pump constant speed control system, including the oil pump, the hydraulic cylinder of control oil pump flow, hydraulic cylinder includes first chamber and second chamber, the oil pump output is connected with hydraulic motor through delivery line, delivery line includes normal open branch pipeline, constant current branch pipeline and constant current control pipeline, normal open branch pipeline, constant current branch pipeline and constant current control pipeline are the parallel construction and distribute, this normal open bleeder is equipped with the electromagnetic switch valve on the road, this constant current bleeder is equipped with the governing valve on the road, be equipped with differential pressure valve on the constant current control pipeline, differential pressure valve's input and the first chamber of hydraulic cylinder intercommunication, differential pressure valve's output is connected with the oil tank. This oil pump constant speed control system can invariable output power, does not change because of the engine speed changes.
Description
Technical field
The utility model relates to mechanical transmission dynamic Control technical field, especially a kind of oil pump constant speed control system.
Background technique
At present, engineering machinery, building machinery, mining machinery, rubber and plastics machine, footwear leather machinery, Die-casting Machines, metallurgical machinery, metal-cutting machine tool and other all kinds of industries etc., because considering the requirement driving stability, are had higher requirement in dynamic Control.The such as concrete mixer in building machinery field, it is in running, the rotating speed of agitator tank can change along with the change of engine speed, agitator tank rotating speed is non-constant easily causes that the useless power of vehicle increases, oil consumption is risen, and then affects the life-span of agitator tank, the stability of vehicle and can affect the problems such as concrete mixing quality in agitator tank.Therefore be necessary to research and develop a kind of oil pump constant speed control system, namely transit mixer operationally agitator tank rotating speed not with motor change and change, keep constant operation.
Model utility content
In order to overcome the deficiencies in the prior art, the utility model provides a kind of oil pump constant speed control system, and this oil pump constant speed control system can constant output power, does not change because engine speed changes.
To achieve these goals, the technical solution adopted in the utility model is: a kind of oil pump constant speed control system, comprise oil pump, the hydraulic jack of control oil pump flow, hydraulic jack comprises the first chamber and the second chamber, oil pump output terminal is connected with oil hydraulic motor by output pipe, it is characterized in that: described output pipe comprises normal open branch line, constant flow side-branch pipeline and current constant control pipeline, normal open branch line, constant flow side-branch pipeline and current constant control pipeline are parallel construction distribution, this normal open branch line is provided with electromagnetic switch valve, this constant flow side-branch pipeline is provided with series flow control valve, described current constant control pipeline is provided with pressure difference valve, the input end of pressure difference valve is communicated with hydraulic jack first chamber, the output terminal of pressure difference valve is connected with fuel tank.
In said structure, hydraulic jack comprises cylinder body, the first chamber and the second chamber is divided into by piston in cylinder body, first chamber of hydraulic jack is connected with oil pump input end (also can be that hydraulic jack second chamber is connected with oil pump input end), oil pump output terminal is then connected with oil hydraulic motor by output pipeline, output pipeline comprises normal open branch line, with constant flow side-branch pipeline, normal open branch line is in cold situation, the fluid of oil pump output terminal enters oil hydraulic motor through electromagnetic switch valve, in normal open state, its flow increases along with the increase of the rotating speed of motor, not there is constant function, when its runner is closed by above-mentioned electromagnetic switch valve energising, the fluid of oil pump output terminal through constant flow side-branch pipeline series flow control valve and enter oil hydraulic motor, and the pressure difference valve on current constant control pipeline carries out Pressure testing to oil pump output terminal and oil hydraulic motor two ends, when two ends pressure reduction increases, then pressure difference valve conducting hydraulic jack first chamber and fuel tank, pressure release is carried out (certainly to oil hydraulic cylinder first chamber, when oil pump output terminal is connected with oil cylinder second chamber, now then to oil cylinder second chamber pressure release), reduce the pressure of oil pump output terminal, until two ends pressure reduction is zero, avoid two ends pressure reduction excessive while realizing constant current, cause oil hydraulic motor impaired.
As further setting of the present utility model, described electromagnetic switch valve comprises Twoway valves and solenoid directional control valve, the first input end of described solenoid directional control valve is connected with oil pump output terminal, solenoid directional control valve first output terminal is connected with Twoway valves, described Twoway valves comprises valve body and spool, spool chamber is provided with in valve body, spool is installed on and is divided into oil suction chamber in spool chamber and by spool chamber, goes out oil pocket and control chamber, control chamber is connected with solenoid directional control valve first output terminal, oil suction chamber with go out oil pocket and be connected with oil pump output terminal and oil hydraulic motor respectively.
In said structure, when solenoid directional control valve is in power-off, the oil suction chamber of Twoway valves and go out oil pocket be in conducting oil pump output terminal and oil hydraulic motor under the impact of fluid, is normal open without constant current state; When solenoid directional control valve is energized, the control chamber of solenoid directional control valve conducting oil pump output terminal and Twoway valves, fluid enters control chamber extruding spool and moves down, closes oil suction chamber and the connected relation going out oil pocket, fluid is passed through by constant flow side-branch pipeline.
As further setting of the present utility model, described solenoid directional control valve also comprises the second input end and the second output terminal, and the second input end is communicated with hydraulic jack second chamber, and the second output terminal is communicated with fuel tank.
In said structure, the second input end of solenoid directional control valve and the second output terminal conducting hydraulic jack second chamber and fuel tank, realize one-way constant flow and control, prevent reverse misoperation function, improve operating security.
As further setting of the present utility model, described pressure difference valve comprises valve pocket and spool, valve pocket is separated into the first valve pocket and the second valve pocket by spool, the part homalographic that the part that spool is positioned at the first valve pocket and spool are positioned at the second valve pocket is arranged, first valve pocket is connected with oil pump output terminal, second valve pocket is connected with oil hydraulic motor, is provided with the return unit acted on spool in described second valve pocket.
In said structure, this pressure difference valve carries out Pressure testing to oil pump output terminal and oil hydraulic motor two ends, when oil pump output end pressure is greater than oil hydraulic motor one end, the spool being then arranged in valve pocket makes the first valve pocket move to the second valve pocket towards the second valve pocket extruding valve core spring (i.e. return unit), second valve pocket is compressed, make the second valve pocket conducting hydraulic jack first chamber and fuel tank, pressure release is carried out to oil hydraulic cylinder first chamber, reduce the pressure of oil pump output terminal, until two ends pressure reduction is zero, valve core spring resets, second valve pocket closes the connected relation of hydraulic jack first chamber and fuel tank, avoid two ends pressure reduction excessive while realizing constant current, cause oil hydraulic motor impaired.
As further setting of the present utility model, the input end of described hydraulic jack is connected with throttle valve, and throttle valve is installed on the pipeline between hydraulic jack and oil pump.
In said structure, the input end of hydraulic jack arranges throttle valve for controlling the output flow of fluid.
As further setting of the present utility model, described output pipe also comprises safety control pipeline, safety control pipeline is provided with pressure-limit valve, two control ends of pressure-limit valve are connected with oil pump output terminal and oil hydraulic motor respectively, the input end of pressure-limit valve is communicated with the control chamber of Twoway valves, the output terminal of pressure-limit valve is communicated with fuel tank, and pressure-limit valve is corresponding to one end that oil hydraulic motor connects is provided with return unit.
In said structure, safety control pipeline has the protective action controlling Twoway valves Slow Close, when solenoid directional control valve is energized, the extruding that the spool of Twoway valves is controlled the fluid in chamber has the trend of pressing down, and oil suction chamber and going out in oil pocket because the impact of fluid has impact force upwards to spool, the downforce that this spool is subject to and impact force partial offset upwards, this spool is slowly moved down close oil suction chamber and go out oil pocket, this oil inlet passage is avoided to close too fast, cause local compression excessive, output pipe is damaged, now pass through the control chamber of pressure-limit valve conducting hydraulic jack first chamber and Twoway valves, realize the Slow Close of Twoway valves, play the effect of protection valve body and output pipeline.
Adopt such scheme, oil pump constant speed control system of the present utility model can close normal open branch line by solenoid directional control valve, the fluid of oil pump output terminal is passed through by constant flow side-branch pipeline, and by pressure difference valve, pressure release is carried out to hydraulic jack, keep the pressure balance at oil pump output terminal and oil hydraulic motor two ends; Secondly, said structure realizes the slow closure function of electromagnetic switch valve by pressure-limit valve, avoids quick closedown to damage valve body and output pipe, plays a protective role; In addition, the utility model also has unidirectional control constant current, prevents the function of reverse misoperation.
Below in conjunction with accompanying drawing, the utility model is further described.
Accompanying drawing explanation
Accompanying drawing 1 specifically implements oil pump constant speed control system block diagram for the utility model;
Accompanying drawing 2 is the enlarged view of C in the utility model specific embodiment accompanying drawing 1;
Hydraulic jack 1, first chamber A, the second chamber B, oil pump 2, oil hydraulic motor 3, normal open branch line P1, constant flow side-branch pipeline P2, current constant control pipeline P3, safety control pipeline P4, emptying pipeline P5, solenoid directional control valve 4, plunger Twoway valves 5, control chamber 51, lower channel 52, plunger 53, spring 54, series flow control valve 6, pressure difference valve 7, pressure-limit valve 8, fuel tank T.
Embodiment
Specific embodiment of the utility model is oil pump 2 constant speed control system as shown in Figure 1-2, comprise the hydraulic jack 1 of oil pump 2, control oil pump flow, the input end of hydraulic jack 1 is connected with throttle valve, and throttle valve is installed on the pipeline between hydraulic jack 1 and oil pump 2, oil pump 2 output terminal is connected with oil hydraulic motor 3 by output pipe, output pipe comprises normal open branch line P1, constant flow side-branch pipeline P2 and current constant control pipeline P3, normal open branch line P1, constant flow side-branch pipeline P2 and current constant control pipeline P3 is parallel construction distribution, this normal open branch line P1 is provided with electromagnetic switch valve, the input end of electromagnetic switch valve is connected with oil pump 2 output terminal, the output terminal of electromagnetic switch valve is connected with oil hydraulic motor 3, this constant flow side-branch pipeline P2 is provided with series flow control valve 6, current constant control pipeline P3 is provided with pressure difference valve 7, the input end of pressure difference valve 7 is communicated with hydraulic jack 1 first chamber A, the output terminal of pressure difference valve 7 is connected with fuel tank T.
In said structure, hydraulic jack 1 comprises cylinder body, the first chamber A and the second chamber B is divided into by piston in cylinder body, first chamber A of hydraulic jack 1 is connected with oil pump 2 input end (also can be that hydraulic jack 1 second chamber B is connected with oil pump 2 input end), oil pump 2 output terminal is then connected with oil hydraulic motor 3 by output pipeline, output pipeline comprises normal open branch line P1, with constant flow side-branch pipeline P2, normal open branch line P1 is in cold situation, the fluid of oil pump 2 output terminal enters oil hydraulic motor 3 through electromagnetic switch valve, in normal open state, its flow increases along with the increase of the rotating speed of motor, not there is constant function, when its runner is closed by above-mentioned electromagnetic switch valve energising, the fluid of oil pump 2 output terminal through constant flow side-branch pipeline P2 series flow control valve 6 and enter oil hydraulic motor 3, and Pressure testing is carried out at pressure difference valve 7 pairs of oil pump 2 output terminals on current constant control pipeline P3 and oil hydraulic motor 3 two ends, when two ends pressure reduction increases, then pressure difference valve 7 conducting hydraulic jack 1 first chamber A and fuel tank T, pressure release is carried out (certainly to oil hydraulic cylinder first chamber A, when oil pump 2 output terminal is connected with oil cylinder second chamber B, now then to the B pressure release of oil cylinder second chamber, namely one end of pressure difference valve 7 conducting is one end that hydraulic jack 1 is connected with oil pump 2 output terminal), reduce the pressure of oil pump 2 output terminal, until two ends pressure reduction is zero, avoid two ends pressure reduction excessive while realizing constant current, cause oil hydraulic motor 3 impaired.
Further, electromagnetic switch valve comprises plunger Twoway valves 5 and solenoid directional control valve 4, and solenoid directional control valve 4 comprises at least two passages, the control chamber 51 of first passage conducting oil pump 2 output terminal and plunger Twoway valves 5, realize closing normal open branch line P1, realize constant current function; Second channel is conducting hydraulic jack 1 second chamber B and fuel tank T then, realizes one-way constant flow and controls, prevent reverse misoperation function, improve operating security.The first passage of solenoid directional control valve 4 comprises first input end, first output terminal, second channel comprises the second input end and the second output terminal, the first input end of solenoid directional control valve 4 is connected with oil pump 2 output terminal, solenoid directional control valve 4 first output terminal is connected with plunger Twoway valves 5, plunger Twoway valves 5 comprises valve body, spool chamber is provided with in valve body, plunger 53 is provided with in this spool chamber, spool chamber is divided into control chamber 51 and oil cavity channel 52 by this plunger 53, oil cavity channel 52 comprises oil suction chamber and goes out oil pocket, oil suction chamber with go out oil pocket and be connected with oil pump 2 output terminal and oil hydraulic motor 3 respectively, be provided with spring 54 in control chamber 51, spring 54 presses plunger 53 makes itself and oil cavity channel 52 be sealed and matched, and control chamber 51 is connected with solenoid directional control valve 4 first output terminal.
In said structure, when solenoid directional control valve 4 is in power-off, the oil cavity channel 52 of plunger Twoway valves 5 is in conducting oil pump 2 output terminal and oil hydraulic motor 3 under the impact of fluid, is normal open without constant current state; When solenoid directional control valve 4 is energized, the control chamber 51 of solenoid directional control valve 4 conducting oil pump 2 output terminal and plunger Twoway valves 5, fluid enters control chamber 51 and extrudes plunger 53 and move towards oil cavity channel 52 direction, closes oil cavity channel 52, fluid is passed through by constant flow side-branch pipeline P2.
Further, output pipe also comprises the safety control pipeline P4 controlling plunger 53 valve Slow Close, this safety control pipeline P4 is provided with pressure-limit valve 8, two control ends of pressure-limit valve 8 are connected with oil pump 2 output terminal and oil hydraulic motor 3 respectively, the input end of pressure-limit valve 8 is communicated with hydraulic jack 1, the output terminal of pressure-limit valve 8 is communicated with control chamber 51, and pressure-limit valve is corresponding to one end that oil hydraulic motor connects is provided with Returnning spring.
In said structure; when solenoid directional control valve 4 is energized; the extruding that the oil cavity channel 52 of plunger Twoway valves 5 is controlled the fluid in chamber 51 can be closed; oil cavity channel 52 is avoided to close too fast; cause local compression excessive, output pipe is damaged, show the control chamber 51 by pressure-limit valve 8 conducting hydraulic jack 1 first chamber A and plunger Twoway valves 5; realize the Slow Close of plunger Twoway valves 5, play the effect of protection valve body and output pipeline.
Further, hydraulic jack 1 comprises cylinder body, the first chamber A and the second chamber B is divided into by piston in cylinder body, first chamber A of hydraulic jack 1 is connected with oil pump 2 input end, oil pump 2 output terminal is then connected with oil hydraulic motor 3 by output pipeline, second chamber B of hydraulic jack 1 is connected with solenoid directional control valve 4 by emptying pipeline P5, and the second output terminal of this solenoid directional control valve 4 is connected with fuel tank T.
Oil pump 2 constant speed control system of the present utility model can close normal open branch line P1 by solenoid directional control valve 4, the fluid of oil pump 2 output terminal is passed through by constant flow side-branch pipeline P2, and carry out pressure release by pressure difference valve 7 pairs of hydraulic jacks 1, keep the pressure balance at oil pump 2 output terminal and oil hydraulic motor 3 two ends; Secondly, said structure realizes the slow closure function of electromagnetic switch valve by pressure-limit valve 8, avoids quick closedown to damage valve body and output pipe, plays a protective role; In addition, the utility model also has unidirectional control constant current, prevents the function of reverse misoperation.The utility model is not limited to above-mentioned embodiment; persons skilled in the art are content disclosed in the utility model; other multiple embodiments can be adopted to implement of the present utility model; or every employing project organization of the present utility model and thinking; do simple change or change, all fall into protection domain of the present utility model.
Claims (6)
1. an oil pump constant speed control system, comprise oil pump, the hydraulic jack of control oil pump flow, hydraulic jack comprises the first chamber and the second chamber, oil pump output terminal is connected with oil hydraulic motor by output pipe, it is characterized in that: described output pipe comprises normal open branch line, constant flow side-branch pipeline and current constant control pipeline, normal open branch line, constant flow side-branch pipeline and current constant control pipeline are parallel construction distribution, this normal open branch line is provided with electromagnetic switch valve, this constant flow side-branch pipeline is provided with series flow control valve, described current constant control pipeline is provided with pressure difference valve, the input end of pressure difference valve is communicated with hydraulic jack first chamber, the output terminal of pressure difference valve is connected with fuel tank.
2. oil pump constant speed control system according to claim 1, it is characterized in that: described electromagnetic switch valve comprises Twoway valves and solenoid directional control valve, the first input end of described solenoid directional control valve is connected with oil pump output terminal, solenoid directional control valve first output terminal is connected with Twoway valves, described Twoway valves comprises valve body and spool, spool chamber is provided with in valve body, spool is installed on and is divided into oil suction chamber in spool chamber and by spool chamber, goes out oil pocket and control chamber, control chamber is connected with solenoid directional control valve first output terminal, oil suction chamber with go out oil pocket and be connected with oil pump output terminal and oil hydraulic motor respectively.
3. oil pump constant speed control system according to claim 2, is characterized in that: described solenoid directional control valve also comprises the second input end and the second output terminal, and the second input end is communicated with hydraulic jack second chamber, and the second output terminal is communicated with fuel tank.
4. oil pump constant speed control system according to claim 1, it is characterized in that: described pressure difference valve comprises valve pocket and spool, valve pocket is separated into the first valve pocket and the second valve pocket by spool, the part homalographic that the part that spool is positioned at the first valve pocket and spool are positioned at the second valve pocket is arranged, first valve pocket is connected with oil pump output terminal, second valve pocket is connected with oil hydraulic motor, is provided with the return unit acted on spool in described second valve pocket.
5. oil pump constant speed control system according to claim 1, it is characterized in that: the input end of described hydraulic jack is connected with throttle valve, throttle valve is installed on the pipeline between hydraulic jack and oil pump.
6. oil pump constant speed control system according to claim 2, it is characterized in that: described output pipe also comprises safety control pipeline, safety control pipeline is provided with pressure-limit valve, two control ends of pressure-limit valve are connected with oil pump output terminal and oil hydraulic motor respectively, the input end of pressure-limit valve is communicated with the control chamber of Twoway valves, the output terminal of pressure-limit valve is communicated with fuel tank, and pressure-limit valve is corresponding to one end that oil hydraulic motor connects is provided with return unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520975885.7U CN205154780U (en) | 2015-12-01 | 2015-12-01 | Oil pump constant speed control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520975885.7U CN205154780U (en) | 2015-12-01 | 2015-12-01 | Oil pump constant speed control system |
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| Publication Number | Publication Date |
|---|---|
| CN205154780U true CN205154780U (en) | 2016-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520975885.7U Withdrawn - After Issue CN205154780U (en) | 2015-12-01 | 2015-12-01 | Oil pump constant speed control system |
Country Status (1)
| Country | Link |
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| CN (1) | CN205154780U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105465065A (en) * | 2015-12-01 | 2016-04-06 | 海特克液压有限公司 | Constant-speed control system of oil pump |
| CN106629504A (en) * | 2015-10-28 | 2017-05-10 | 比亚迪股份有限公司 | Electric forklift as well as hydraulic system thereof and control method of hydraulic system |
-
2015
- 2015-12-01 CN CN201520975885.7U patent/CN205154780U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106629504A (en) * | 2015-10-28 | 2017-05-10 | 比亚迪股份有限公司 | Electric forklift as well as hydraulic system thereof and control method of hydraulic system |
| CN106629504B (en) * | 2015-10-28 | 2019-12-10 | 比亚迪股份有限公司 | Electric forklift, hydraulic system thereof and control method of hydraulic system |
| CN105465065A (en) * | 2015-12-01 | 2016-04-06 | 海特克液压有限公司 | Constant-speed control system of oil pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160413 Effective date of abandoning: 20171226 |