CN204041579U - Engineering machinery metering pump speed-regulating hydraulic system - Google Patents
Engineering machinery metering pump speed-regulating hydraulic system Download PDFInfo
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- CN204041579U CN204041579U CN201420461503.4U CN201420461503U CN204041579U CN 204041579 U CN204041579 U CN 204041579U CN 201420461503 U CN201420461503 U CN 201420461503U CN 204041579 U CN204041579 U CN 204041579U
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Abstract
The utility model discloses a kind of engineering machinery metering pump speed-regulating hydraulic system, to connect between working pump with motor pump-motor integrated machine, pump-motor integrated machine outlet connection control valve, in order to control pump-motor integrated machine rate of discharge, thus regulate the rotating ratio of working pump and motor, control valve is by pilot valve delivery outlet pressure, signal pump and working pump outlet pressure control, pilot valve delivery outlet pressure is higher, control valve control pump motor outlet flow is less, the rotating ratio of working pump and motor is larger, the flow that working pump exports is larger, to meet system requirements.When induced pressure change or engine speed change, control valve adjustment pump-motor integrated machine delivery outlet flow, ensure that working pump rotating speed is constant, maintain flow system flow and stablize, namely flow system flow does not affect by load and engine speed, reduce restriction loss, have very high energy-saving benefit, adopt metering pump and non-loading sensitive control valve, antipollution power is strong, system element is simple, easy to maintenance.
Description
Technical field
The utility model 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 (such as loader) requires more and more higher in energy-saving and noise-reducing, operation comfort, particularly hydraulic system control aspect.Traditional engineering machinery adopts quantitative gear pump hydraulic system, and utilizes the principle of throttle grverning to carry out speeds 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, cause energy loss.
For solving the overflow energy loss problem of hydraulic system, existing solution adopts variable displacement pump hydraulic system, by feedback load signal controlled variable pump displacement, makes flow system flow only meet system requirements, do not have unnecessary fluid overflow.But this scheme has following drawback: be one, Moderator Variable pump displacement, need set up restriction in systems in which, with measuring system traffic demand, Moderator Variable pump displacement, which results between variable pumping hole and load and has larger pressure reduction, define restriction loss; Two, variable displacement pump hydraulic system must be equipped with load feedback valve, and variable displacement pump and load feedback valve require higher to the turbidity test of fluid, reduce the contamination resistance of system; Three, variable displacement pump and load feedback valve arrangement complexity, coordinate accurate, cost of production is high, and maintenance difficult is unfavorable for promoting.
Summary of the invention
For above-mentioned prior art Problems existing, the utility model provides a kind of engineering machinery metering pump speed-regulating hydraulic system, reduces restriction loss during 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 utility model speed-regulating hydraulic system, comprises fuel tank, relief valve, pioneer pump, motor, pump-motor integrated machine, control valve, shuttle valve, pilot valve, multi-way valve, executive component, working pump and signal pump in order to control pump-motor integrated machine rate of discharge; 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; Pump-motor integrated machine import connects fuel tank, outlet connection 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 and control valve control mouth e2 and are connected, multi-way valve oil outlet is connected with executive component, pioneer pump outlet is connected with pilot valve, relief valve in parallel simultaneously, relief valve oil return connects fuel tank, Pilot valve outlet and multi-way valve control mouth and are connected, and Pilot valve outlet shuttle valve import in parallel, shuttle valve outlet controls mouth e1 with control valve and is connected.
When the rotation speed change of motor, the flow of signal pump changes thereupon, and corresponding adjustment control valve makes pump-motor integrated machine resistance to flow output respective change, and the rotating ratio of adjustment working pump and motor, the rotating speed of maintenance work pump is substantially constant.
Further, described working pump 11 oil outlet oil circuit connection control in parallel valve 6 controls mouth e3.Regulate the spool in control valve, when reaching working pump pressure arrival certain value, working pump adjusts output flow automatically, thus protective system, reduce spill losses.
Further, described multi-way valve 9 return opening is connected with fuel tank 1 by return filter 13.The return line of system arranges return filter 13, the pollutant producing or invade is filtered out before returning fuel tank, effective control system pollution concentration in system.
As a kind of scheme of the present utility model, 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.
Compared with existing metering pump hydraulics, the utility model has been connected pump-motor integrated machine between working pump with motor, pump-motor integrated machine outlet connection control valve, in order to control pump-motor integrated machine rate of discharge, thus regulate the rotating ratio of working pump and motor, control valve is by pilot valve delivery outlet pressure, signal pump and working pump outlet pressure control, pilot valve delivery outlet pressure is higher, control valve control pump motor outlet flow is less, the rotating ratio of working pump and motor is larger, and the flow that working pump exports is larger, to meet system requirements.When induced pressure change or engine speed change, because signal pump is coaxial with working pump, therefore signal pump discharge pressure regulates the spool in control valve, control valve adjustment pump-motor integrated machine delivery outlet flow, ensure that working pump rotating speed is constant, maintenance flow system flow is stablized, working connection system is without restriction, flow system flow does not affect by load and engine speed, thus 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 structure is simple, cost is low, easy to maintenance.
Accompanying drawing explanation
Fig. 1 is the utility model hydraulic schematic diagram;
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 utility model is described in further detail.
As shown in Figure 1, the utility model engineering machinery metering pump speed-regulating hydraulic system, comprises fuel tank 1, relief valve 2, pioneer pump 3, motor 4, pump-motor integrated machine 5, control valve 6, shuttle valve 7, pilot valve 8, multi-way valve 9, executive component, working pump 11 and signal pump 12 in order to control pump-motor integrated machine rate of discharge; Motor 4 is connected by pump-motor integrated machine 5 with working pump 11, and signal pump 12 and working pump 11 are serially connected and are connected to pump-motor integrated machine 5, and working pump 11 and signal pump 12 import are connected to fuel tank 1; Pump-motor integrated machine 5 import connects fuel tank 1, outlet connection 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 and control valve 6 control mouth e2 and are connected, multi-way valve 9 oil outlet is connected with executive component, pioneer pump 3 exports and is connected with pilot valve 8, relief valve 2 in parallel simultaneously, relief valve 2 oil return connects fuel tank 1, pilot valve 8 exports and controls mouth with multi-way valve 9 and be connected, and pilot valve 8 exports shuttle valve 7 in parallel import, and shuttle valve 7 outlet controls mouth e1 with control valve 6 and is connected.
Working principle of the present utility model is: the commutation of the Stress control multi-way valve 9 that pilot valve 8 exports and spool open size, enter into control valve 6 by shuttle valve 7 simultaneously, control valve 6 spool is by contrast pilot valve 8 delivery pressure and signal pump 12 outlet pressure, the delivery outlet flow of control pump-motor integrated machine 5, thus control the rotating ratio of motor 4 to working pump 11, namely the flow of working pump 11 is controlled, thus the flow realizing working pump 11 changes with the delivery pressure change of pilot valve 8, reduce restriction loss, and meet hydraulic system of working demand.
As shown in Figure 1, working pump 11 oil outlet oil circuit connection control in parallel valve 6 controls mouth e3.The pressure that working pump 11 exports to be guided in control valve 6 on the right side of spool b; when this pressure exceedes 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; pump-motor integrated machine 5 resistance to flow output reduces; reduce the rotating speed of working pump 11; reduce the flow of working pump 11; until only maintain the minimum discharge needed for this outlet pressure, thus when 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 pilot valve 8 exports a pilot pressure, multi-way valve 9 spool is mobile corresponding distance after receiving pressure, valve port opens corresponding opening, this pilot pressure simultaneously, be delivered in control valve 6 by shuttle valve 7, promote spool d in control valve 6 to move to left, pilot pressure is after the throttling of spool d, by the left position of spool b, enter on the right side of spool a and control mouth, spool a is made to 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, motor 4 is made to pass to the certain rotating speed of working pump 11, working pump 11 produces the flow corresponding with pilot valve 8 delivery pressure, synchronous signal pump 12 exports corresponding discharge, certain pressure is set up in by control valve 6 during restriction c, on the left of this pressure and spool d, spring and pilot pressure are formed and balance, force value on the right side of common regulation output to spool a, when working pump 11 output flow is higher than demand, namely working pump rotating speed is too high, because signal pump 12 is coaxial with working pump 11, therefore signal pump 12 exports and set up higher pressure before restriction c in control valve 6, promote spool d in control valve 6 to move to right, reduce the force value outputted in control valve 6 on the right side of spool a, 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, keep the corresponding relation of flow and pilot pressure.Otherwise, as the same.
As shown in Figure 1, multi-way valve 9 return opening is connected with fuel tank 1 by return filter 13.The return line of system arranges return filter 13, the pollutant producing or invade is filtered out before returning fuel tank, effective control system pollution concentration in system.
In addition as a kind of scheme of the present utility model, 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.But performing original paper and be not limited to oil cylinder, also can be 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), control valve (6), shuttle valve (7), pilot valve (8), multi-way valve (9), executive component, working pump (11) and signal pump (12) in order to control pump-motor integrated machine rate of discharge;
Described motor (4) is connected by pump-motor integrated machine (5) with working pump (11), signal pump (12) and working pump (11) are serially connected and are connected to pump-motor integrated machine (5), and working pump (11) and signal pump (12) import are connected to fuel tank (1); Pump-motor integrated machine (5) import connects fuel tank (1), outlet connection 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) controls mouth 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), relief valve in parallel (2) simultaneously, relief valve (2) oil return connects fuel tank (1), pilot valve (8) outlet controls 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 controls mouth 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 connection control valve (6) in parallel controls mouth e3, when working pump (11) pressure exceedes 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 |
|---|---|---|---|
| CN201420461503.4U CN204041579U (en) | 2014-08-15 | 2014-08-15 | Engineering machinery metering pump speed-regulating hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420461503.4U CN204041579U (en) | 2014-08-15 | 2014-08-15 | Engineering machinery metering pump speed-regulating hydraulic system |
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| Publication Number | Publication Date |
|---|---|
| CN204041579U true CN204041579U (en) | 2014-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420461503.4U Withdrawn - After Issue CN204041579U (en) | 2014-08-15 | 2014-08-15 | Engineering machinery metering pump speed-regulating hydraulic system |
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| CN (1) | CN204041579U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179736A (en) * | 2014-08-15 | 2014-12-03 | 徐工集团工程机械股份有限公司科技分公司 | Speed-governing hydraulic system for engineering mechanical fixed displacement pump |
-
2014
- 2014-08-15 CN CN201420461503.4U patent/CN204041579U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104179736A (en) * | 2014-08-15 | 2014-12-03 | 徐工集团工程机械股份有限公司科技分公司 | Speed-governing hydraulic system for engineering mechanical fixed displacement pump |
| CN104179736B (en) * | 2014-08-15 | 2016-08-24 | 徐工集团工程机械股份有限公司科技分公司 | A kind of engineering machinery constant displacement pump speed-regulating hydraulic system |
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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: 20141224 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |