CN104179736A - Speed-governing hydraulic system for engineering mechanical fixed displacement pump - Google Patents
Speed-governing hydraulic system for engineering mechanical fixed displacement pump Download PDFInfo
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- CN104179736A CN104179736A CN201410402081.8A CN201410402081A CN104179736A CN 104179736 A CN104179736 A CN 104179736A CN 201410402081 A CN201410402081 A CN 201410402081A CN 104179736 A CN104179736 A CN 104179736A
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Abstract
The invention discloses a speed-governing hydraulic system for an engineering mechanical fixed displacement pump. A pump-motor integrated machine is connected in series between a working pump and an engine; the outlet of the pump-motor integrated machine is connected with a control valve for controlling the flux at the outlet of the pump-motor integrated machine, so as to adjust the rotary speed ratio of the working pump and the engine; the control valve is controlled through the pressure at the output opening of a pilot valve, and the pressure at the outlet of each of the signal pump and the working pump; the higher is the pressure at the output opening of the pilot valve, the smaller is the flux at the outlet of the control pump motor of the control valve, the larger is the rotary speed ratio of the working pump and the engine, and the larger is the flux output by the working pump, so that the requirement of the system is met. According to the system, when loading pressure changes or the rotary speed of the engine changes, as the control valve is used for adjusting the flux at the output opening of the pump-motor integrated machine, the rotary speed of the working pump remains unchanged, the system flux remains stable, namely, the system flux is free from the influence of the loading and the rotary speed of the engine, and as a result, the throttling loss is reduced, so that the system is extremely high in energy-saving benefit; besides, as the fixed displacement pump and a non-load-sensitive control valve are adopted, the system is strong in anti-pollution property, simple in system elements, and convenient for maintenance.
Description
Technical field
The present invention relates to a kind of construction machinery hydraulic system, specifically a kind of engineering machinery metering pump speed-regulating hydraulic system.
Background technique
In order to meet the need of market, engineering machinery (for example loader) requires more and more higher aspect energy-saving and noise-reducing, operation comfort, particularly hydraulic system manipulation aspect.Traditional engineering machinery adopts quantitative gear pump hydraulic system, and utilizes the principle of throttle grverning to carry out speed control to the executive component of engineering machinery hydraulic system of working.Adopt throttle grverning to make a large amount of hydraulic oil liquids from restriction overflow, caused energy loss.
For solving the overflow energy loss problem of hydraulic system, existing solution is to adopt variable displacement pump hydraulic system, by feedback load SC sigmal control variable displacement pump discharge capacity, makes flow system flow only meet system requirements, there is no unnecessary fluid overflow.But this scheme has following drawback: be one, Moderator Variable pump displacement, need in system, set up restriction, and with measuring system traffic demand, Moderator Variable pump displacement, this has caused between variable pumping hole and load larger pressure reduction, has formed restriction loss; Two, variable displacement pump hydraulic system must be equipped with load feedback valve, and variable displacement pump and load feedback valve are had relatively high expectations to the turbidity test of fluid, have reduced the contamination resistance of system; Three, variable displacement pump and load feedback valve arrangement are complicated, coordinate precision, and cost of production is high, and maintenance difficult is unfavorable for promoting.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides a kind of engineering machinery metering pump speed-regulating hydraulic system, the restriction loss while reducing work, reduce Hydraulic System Fever amount, improve capacity usage ratio, contamination resistance is strong, element structure is simple, and cost is low, is convenient to maintenance.
To achieve these goals, a kind of engineering machinery metering pump of the present invention speed-regulating hydraulic system, comprises fuel tank, relief valve, pioneer pump, motor, pump-motor integrated machine, the control valve in order to control pump-motor integrated machine rate of discharge, shuttle valve, pilot valve, multi-way valve, executive component, working pump and signal pump; Described motor is connected by pump-motor integrated machine with working pump, and signal pump and working pump are serially connected and are connected to pump-motor integrated machine, and working pump and signal pump inlet are connected to fuel tank; The import of pump-motor integrated machine connects fuel tank, and outlet connects control valve; Control valve return opening is connected with fuel tank, and working pump oil outlet is connected with multi-way valve filler opening; Signal pump is controlled a mouthful e2 with control valve and is connected, multi-way valve oil outlet is connected with executive component, pioneer pump outlet is connected with pilot valve, while relief valve in parallel, relief valve oil return connects fuel tank, pilot valve outlet is controlled mouth with multi-way valve and is connected, and pilot valve exports shuttle valve import in parallel, and shuttle valve outlet is controlled a mouthful e1 with control valve and is connected.
When the rotation speed change of motor, the flow of signal pump changes thereupon, adjusts accordingly control valve and makes pump-motor integrated machine resistance to flow output respective change, adjusts the rotating ratio of working pump and motor, and the rotating speed of maintenance work pump is substantially constant.
Further, described working pump 11 oil outlets oil circuit in parallel connects control valve 6 control mouthful e3.Spool in control valve is regulated, and while reaching working pump pressure arrival certain value, working pump is adjusted output flow automatically, thereby protective system reduces spill losses.
Further, described multi-way valve 9 return openings are connected with fuel tank 1 by return filter 13.Return filter 13 is set on the return line of system, the pollutant that produces or invade is filtered out before returning to fuel tank, effectively control system pollution concentration in system.
As a kind of scheme of the present invention, described executive component is oil cylinder, and multi-way valve oil outlet is connected with rodless cavity respectively at the rod chamber of oil cylinder.
Compare with existing metering pump hydraulics, the present invention's pump-motor integrated machine of having connected between working pump and motor, the outlet of pump-motor integrated machine connects control valve, in order to control pump-motor integrated machine rate of discharge, thereby regulate the rotating ratio of working pump and motor, control valve is subject to pilot valve delivery outlet pressure, signal pump and working pump outlet pressure are controlled, pilot valve delivery outlet pressure is higher, control valve control pump motor rate of discharge is less, the rotating ratio of working pump and motor is larger, and the flow of working pump output is just larger, to meet system requirements.When induced pressure variation or engine speed variation, because signal pump is coaxial with working pump, therefore signal pump discharge pressure regulates the spool in control valve, control valve is adjusted pump-motor integrated machine delivery outlet flow, guarantee that working pump rotating speed is constant, maintain flow system flow stable, working connection system is without restriction, flow system flow is not affected by load and engine speed, thereby minimizing restriction loss, reduce Hydraulic System Fever amount, there is very high energy-saving benefit, adopt metering pump and non-loading sensitive control valve, antipollution power is strong, system element is simple in structure, cost is low, easy to maintenance.
Accompanying drawing explanation
Fig. 1 is hydraulic schematic diagram of the present invention;
In figure: 1, fuel tank, 2, relief valve, 3, pioneer pump, 4, motor, 5, pump-motor integrated machine, 6, control valve, 7, shuttle valve, 8, pilot valve, 9, multi-way valve, 10, oil cylinder, 11, working pump, 12, signal pump, 13, return filter.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, engineering machinery metering pump speed-regulating hydraulic system of the present invention, comprises fuel tank 1, relief valve 2, pioneer pump 3, motor 4, pump-motor integrated machine 5, the control valve 6 in order to control pump-motor integrated machine rate of discharge, shuttle valve 7, pilot valve 8, multi-way valve 9, executive component, working pump 11 and signal pump 12; Motor 4 is connected by pump-motor integrated machine 5 with working pump 11, and signal pump 12 is serially connected with working pump 11 and is connected to pump-motor integrated machine 5, and working pump 11 is connected to fuel tank 1 with 12 imports of signal pump; 5 imports of pump-motor integrated machine connect fuel tank 1, and outlet connects control valve 6; Control valve 6 return openings are connected with fuel tank 1, and working pump 11 oil outlets are connected with multi-way valve 9 filler openings; Signal pump 12 is controlled a mouthful e2 with control valve 6 and is connected, multi-way valve 9 oil outlets are connected with executive component, pioneer pump 3 outlets are connected with pilot valve 8, while relief valve 2 in parallel, relief valve 2 oil returns connect fuel tank 1, pilot valve 8 outlets are controlled mouth with multi-way valve 9 and are connected, pilot valve 8 outlet shuttle valve 7 imports in parallel, and shuttle valve 7 outlets are controlled a mouthful e1 with control valve 6 and are connected.
Working principle of the present invention is: the pressure of pilot valve 8 outputs is controlled commutation and the spool of multi-way valve 9 and opened size, by shuttle valve 7, enter into control valve 6 simultaneously, control valve 6 spools are by contrast pilot valve 8 delivery pressures and signal pump 12 outlet pressures, the delivery outlet flow of control pump-motor integrated machine 5, thereby control engine 4 is to the rotating ratio of working pump 11, control the flow of working pump 11, thereby the flow of realizing working pump 11 changes with the delivery pressure of pilot valve 8, reduce restriction loss, and meet hydraulic system of working demand.
As shown in Figure 1, working pump 11 oil outlets oil circuit in parallel connects control valve 6 control mouthful e3.The pressure of working pump 11 outlets is guided to spool b right side in control valve 6; when this pressure surpasses certain value; in control valve 6, spool b moves to left; in control valve 6, spool a right atrial pressure is by the spool b oil return in control valve 6; in control valve 6, spool a moves to right; 5 resistances to flow output of pump-motor integrated machine reduce; reduce the rotating speed of working pump 11; reduce the flow of working pump 11; until only maintain the required minimum discharge of this outlet pressure, thereby while making working pump outlet pressure higher than certain value, working pump can reduce flow automatically; protective system, prevents spill losses.
The speed governing of above-described embodiment metering pump speed-regulating hydraulic system is specifically achieved in that a pilot pressure of pilot valve 8 outputs, multi-way valve 9 spools move corresponding distance after receiving pressure, valve port is opened corresponding opening, this pilot pressure simultaneously, by shuttle valve 7, be delivered in control valve 6, promoting spool d in control valve 6 moves to left, pilot pressure is after the throttling of spool d, by the left position of spool b, enter into spool a right side and control mouth, make spool a produce certain displacement, increase the resistance to flow output of pump-motor integrated machine 5, reduce the rate of discharge of pump-motor integrated machine 5, make motor 4 pass to the certain rotating speed of working pump 11, working pump 11 produces the flow corresponding with pilot valve 8 delivery pressures, synchronous signal pump 12 output corresponding discharges, in by control valve 6, set up certain pressure during restriction c, this pressure and spool d left side spring and pilot pressure form balance, common regulation output is to the force value on spool a right side, when working pump 11 output flows are during higher than demand, be that working pump rotating speed is too high, because signal pump 12 is coaxial with working pump 11, therefore higher pressure is set up in 12 outlets of signal pump in control valve 6 before restriction c, promoting spool d in control valve 6 moves to right, reduce to output to the force value on spool a right side in control valve 6, the resistance to flow output of pump-motor integrated machine 5 is reduced, reduce the rotating speed of working pump 11 and signal pump 12, the flow of working pump 11 is reduced, the corresponding relation that keeps flow and pilot pressure.Otherwise, as the same.
As shown in Figure 1, multi-way valve 9 return openings are connected with fuel tank 1 by return filter 13.Return filter 13 is set on the return line of system, the pollutant that produces or invade is filtered out before returning to fuel tank, effectively control system pollution concentration in system.
In addition as a kind of scheme of the present invention, described executive component is oil cylinder 10, and multi-way valve 9 oil outlets are connected with rodless cavity respectively at the rod chamber of oil cylinder 10.But carrying out original paper and be not limited to oil cylinder, can be also other execution work elements.
Claims (4)
1. an engineering machinery metering pump speed-regulating hydraulic system, it is characterized in that, comprise fuel tank (1), relief valve (2), pioneer pump (3), motor (4), pump-motor integrated machine (5), the control valve (6) in order to control pump-motor integrated machine rate of discharge, shuttle valve (7), pilot valve (8), multi-way valve (9), executive component, working pump (11) and signal pump (12);
Described motor (4) is connected by pump-motor integrated machine (5) with working pump (11), signal pump (12) is serially connected with working pump (11) and is connected to pump-motor integrated machine (5), and working pump (11) is connected to fuel tank (1) with signal pump (12) import; Pump-motor integrated machine (5) import connects fuel tank (1), and outlet connects control valve (6); Control valve (6) return opening is connected with fuel tank (1), and working pump (11) oil outlet is connected with multi-way valve (9) filler opening; Signal pump (12) is controlled a mouthful e2 with control valve (6) and is connected, multi-way valve (9) oil outlet is connected with executive component, pioneer pump (3) outlet is connected with pilot valve (8), while relief valve in parallel (2), relief valve (2) oil return connects fuel tank (1), pilot valve (8) outlet is controlled mouth with multi-way valve (9) and is connected, and pilot valve (8) exports shuttle valve in parallel (7) import, and shuttle valve (7) outlet is controlled a mouthful e1 with control valve (6) and is connected.
2. engineering machinery metering pump speed-regulating hydraulic system according to claim 1, it is characterized in that, described working pump (11) oil outlet oil circuit in parallel connects control valve (6) and controls a mouthful e3, when working pump (11) pressure surpasses certain value, control valve (6) reduces pump-motor integrated machine (5) resistance to flow output, reduces the flow of working pump (11).
3. engineering machinery metering pump speed-regulating hydraulic system according to claim 1 and 2, is characterized in that, described multi-way valve (9) return opening is connected with fuel tank (1) by return filter (13).
4. engineering machinery metering pump speed-regulating hydraulic system according to claim 1 and 2, is characterized in that, described executive component is oil cylinder (10), and multi-way valve (9) oil outlet is connected with rodless cavity respectively at the rod chamber of oil cylinder (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410402081.8A CN104179736B (en) | 2014-08-15 | 2014-08-15 | A kind of engineering machinery constant displacement pump speed-regulating hydraulic system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410402081.8A CN104179736B (en) | 2014-08-15 | 2014-08-15 | A kind of engineering machinery constant displacement pump speed-regulating hydraulic system |
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| CN104179736A true CN104179736A (en) | 2014-12-03 |
| CN104179736B CN104179736B (en) | 2016-08-24 |
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| CN201410402081.8A Active CN104179736B (en) | 2014-08-15 | 2014-08-15 | A kind of engineering machinery constant displacement pump speed-regulating hydraulic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323930A (en) * | 2021-06-28 | 2021-08-31 | 湖南三一中型起重机械有限公司 | Multistage pressure control and pressure speed regulation hydraulic system and operation machinery |
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| JPH0579060A (en) * | 1991-09-20 | 1993-03-30 | Yutani Heavy Ind Ltd | Hydraulic circuit of hydraulic shovel |
| EP0644335A1 (en) * | 1993-03-23 | 1995-03-22 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive for hydraulic work machine |
| JP2001214902A (en) * | 2000-02-03 | 2001-08-10 | Hitachi Constr Mach Co Ltd | Hydraulic circuit device for hydraulic shovel |
| EP1288507A2 (en) * | 1996-01-10 | 2003-03-05 | Aeroquip-Vickers International GmbH | Low-loss drive system for a hydraulic actuator |
| JP2007321463A (en) * | 2006-06-01 | 2007-12-13 | Takeuchi Seisakusho:Kk | Work vehicle |
| CN101360917A (en) * | 2006-08-30 | 2009-02-04 | 大金工业株式会社 | Hydraulic unit and method of controlling speed of motor in hydraulic unit |
| CN101910646A (en) * | 2008-01-22 | 2010-12-08 | 大金工业株式会社 | Confluent control system |
| CN102261107A (en) * | 2011-05-27 | 2011-11-30 | 贵州詹阳动力重工有限公司 | Infinitely variable speed control system for wheel type hydraulic excavator |
| CN204041579U (en) * | 2014-08-15 | 2014-12-24 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machinery metering pump speed-regulating hydraulic system |
-
2014
- 2014-08-15 CN CN201410402081.8A patent/CN104179736B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0579060A (en) * | 1991-09-20 | 1993-03-30 | Yutani Heavy Ind Ltd | Hydraulic circuit of hydraulic shovel |
| EP0644335A1 (en) * | 1993-03-23 | 1995-03-22 | Hitachi Construction Machinery Co., Ltd. | Hydraulic drive for hydraulic work machine |
| EP1288507A2 (en) * | 1996-01-10 | 2003-03-05 | Aeroquip-Vickers International GmbH | Low-loss drive system for a hydraulic actuator |
| JP2001214902A (en) * | 2000-02-03 | 2001-08-10 | Hitachi Constr Mach Co Ltd | Hydraulic circuit device for hydraulic shovel |
| JP2007321463A (en) * | 2006-06-01 | 2007-12-13 | Takeuchi Seisakusho:Kk | Work vehicle |
| CN101360917A (en) * | 2006-08-30 | 2009-02-04 | 大金工业株式会社 | Hydraulic unit and method of controlling speed of motor in hydraulic unit |
| CN101910646A (en) * | 2008-01-22 | 2010-12-08 | 大金工业株式会社 | Confluent control system |
| CN102261107A (en) * | 2011-05-27 | 2011-11-30 | 贵州詹阳动力重工有限公司 | Infinitely variable speed control system for wheel type hydraulic excavator |
| CN204041579U (en) * | 2014-08-15 | 2014-12-24 | 徐工集团工程机械股份有限公司科技分公司 | Engineering machinery metering pump speed-regulating hydraulic system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323930A (en) * | 2021-06-28 | 2021-08-31 | 湖南三一中型起重机械有限公司 | Multistage pressure control and pressure speed regulation hydraulic system and operation machinery |
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| CN104179736B (en) | 2016-08-24 |
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Inventor after: Fan Xiaotong Inventor after: Ren Daming Inventor after: Liu Guowei Inventor after: Song Yali Inventor after: Ma Pengpeng Inventor before: Fan Xiaotong Inventor before: Ren Daming Inventor before: Liu Guowei Inventor before: Song Yali Inventor before: Ma Pengpeng |
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