CN104235094A - Hydraulic system with stable safety pressure - Google Patents
Hydraulic system with stable safety pressure Download PDFInfo
- Publication number
- CN104235094A CN104235094A CN201310361521.5A CN201310361521A CN104235094A CN 104235094 A CN104235094 A CN 104235094A CN 201310361521 A CN201310361521 A CN 201310361521A CN 104235094 A CN104235094 A CN 104235094A
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- valve
- safety valve
- variable displacement
- drainback passage
- pressure
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Abstract
The invention relates to a hydraulic system with stable safety pressure. The hydraulic system comprises a hydraulic oil tank, a variable displacement piston pump, a variable displacement mechanism, an LS oil channel, a first safety valve, an unloading spill valve, a T oil return channel, a Ts oil return channel and a plurality of parallel executing mechanisms. The inlet passage of the variable displacement piston pump is connected with the hydraulic oil tank. The first safety valve, the unloading spill valve and the plurality of executing mechanisms are parallelly connected to the outlet passage of the variable displacement piston pump. The left end of the variable displacement mechanism is communicated with the LS oil channel, and the right end thereof is connected with an outlet of the variable displacement piston pump. The first safety valve, the unloading spill valve, the oil return channels of the plurality of executing mechanisms are communicated with the T oil return channel which is connected with the hydraulic oil tank through a filter cooling mechanism. One end of the Ts oil return channel is communicated with the LS oil channel through a second safety valve and a constant-flow valve which are connected in parallel, and the other end of the Ts oil return channel is connected with the hydraulic oil tank. The hydraulic system has the advantages that the Ts oil return channel independent of the T oil return channel is added, so that the safety pressure of the second safety valve is stable, and reliable operation of the hydraulic system is guaranteed.
Description
Technical field
The present invention relates to a kind of hydraulic system, particularly a kind of hydraulic system with stability and safety pressure.
Background technique
US005806312A, hydraulic system described in US005791142A patent of invention flows back in hydraulic oil container process, fluid is through filtering, cooling mechanism can produce obstruction pressure, the flow passed through is larger, hinder the pressure loss also larger, and hinder pressure with changes in flow rate, and LS pressure Ze Shi actuator) in maximum load pressure and LS safety valve export oil return and hinder pressure sum, if nothing is independent of the Ts drainback passage of T drainback passage, then on LS safety valve cracking pressure depart from setting pressure and be always change, in like manner, variable displacement mechanism pressure reduction also departs from the pressure of setting and is change always, unfavorable hydraulic system reliably works.
Summary of the invention
The object of the invention is the defect overcoming prior art existence, a kind of Ts drainback passage be provided with independent of T drainback passage is provided, make the second safety valve have stable safety pressure, thus ensure that the hydraulic system with stability and safety pressure that hydraulic system reliably works.
The technological scheme realizing the object of the invention is: a kind of hydraulic system with stability and safety pressure, has hydraulic oil container, Variable plunger pump, variable displacement mechanism, LS oil duct, the first safety valve, unloading overflow valve, T drainback passage and some actuators be set up in parallel; The inlet channel of described Variable plunger pump is connected with hydraulic oil container, outlet passage is parallel with the first safety valve, unloading overflow valve and some actuators; The left end of described variable displacement mechanism is communicated with LS oil duct, and right-hand member is connected with variable piston delivery side of pump; Described first safety valve, unloading overflow valve are communicated with T drainback passage with the drainback passage of some actuators; Described T drainback passage is connected with hydraulic oil container by filtering cooling mechanism; Also there is Ts drainback passage; One end of described Ts drainback passage is communicated with LS oil duct with permanent-flow valve by the second safety valve in parallel, and the other end is connected with hydraulic oil container.
After adopting technique scheme, the present invention has following positive effect:
The present invention is provided with the Ts drainback passage independent of T drainback passage, the second safety valve is made to have stable safety pressure, thus ensure that hydraulic system reliably works, if nothing is independent of the Ts drainback passage of T drainback passage, then on the second safety valve cracking pressure depart from setting pressure and be always change, in like manner, variable displacement mechanism pressure reduction also departs from the pressure of setting and is change always, and unfavorable hydraulic system reliably works.
Accompanying drawing explanation
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is systematic schematic diagram of the present invention;
Attached number in the figure is: hydraulic oil container 1, Variable plunger pump 2, variable displacement mechanism 3, LS oil duct 4, first safety valve 5, unloading overflow valve 6, T drainback passage 7, actuator 8, filtration cooling mechanism 9, Ts drainback passage 10, second safety valve 11, permanent-flow valve 12.
Embodiment
(embodiment 1)
See Fig. 1, a kind of hydraulic system with stability and safety pressure, there is hydraulic oil container 1, Variable plunger pump 2, variable displacement mechanism 3, LS oil duct 4, first safety valve 5, unloading overflow valve 6, T drainback passage 7 and some actuators 8 be set up in parallel; The inlet channel of Variable plunger pump 2 is connected with hydraulic oil container 1, outlet passage is parallel with the first safety valve 5, unloading overflow valve 6 and some actuators 8; The left end of variable displacement mechanism 3 is communicated with LS oil duct 4, and right-hand member is connected with the outlet of Variable plunger pump 2; First safety valve 5, unloading overflow valve 6 are communicated with T drainback passage 7 with the drainback passage of some actuators 8; T drainback passage 7 is connected with hydraulic oil container 1 by filtering cooling mechanism 9; Also there is Ts drainback passage 10; One end of Ts drainback passage 10 is communicated with LS oil duct 4 with permanent-flow valve 12 by the second safety valve 11 in parallel, and the other end is connected with hydraulic oil container 1.
Working principle of the present invention is: in hydraulic circuit, the control bound of some actuators 8 has pressure compensation load sensing controlled system, the oil sources needed for actuator is provided by Variable plunger pump 2 in system, its variable is controlled by variable displacement mechanism 3, and the difference that variable displacement mechanism 3 feeds back pressure by high capacity most in Variable plunger pump 2 outlet pressure and actuator 8 controls; In parallel the second safety valve 11 and permanent-flow valve 12 on LS oil circuit, second safety valve 11 and permanent-flow valve 12 export and flow back to hydraulic oil container 1 by the Ts passage 3 of without hindrance pressure, and the second safety valve 11 and permanent-flow valve 12 export fluid and be located away from the first safety valve 5, actuator 8) etc. oil return; LS oil duct is communicated with variable displacement mechanism 3 left end, and Variable plunger pump 2 exports and is also communicated with variable displacement mechanism 3 right-hand member; Variable plunger pump 2 outlet passage is connected in parallel the first safety valve 5, unloading overflow valve 6 and actuator 8, first safety valve 5, unloading overflow valve 6 are communicated with T drainback passage 7 with the drainback passage of actuator 8 etc., and T drainback passage 7 needed through filtering cooling mechanism 2 before flowing back to fuel tank.Fluid can produce obstruction pressure through filtering cooling mechanism 2, the flow passed through is larger, hinder the pressure loss also larger, and hinder pressure with changes in flow rate, and maximum load pressure and the second safety valve 11 export oil return and hinder pressure sum in LS pressure Ze Shi actuator 8, if nothing is independent of the Ts drainback passage 10 of T drainback passage 7, then on the second safety valve 11 cracking pressure depart from setting pressure and be always change, in like manner, variable displacement mechanism 3 pressure reduction also departs from the pressure of setting and is change always, and unfavorable hydraulic system reliably works.Be provided with the Ts drainback passage 10 independent of T drainback passage 7 in the present invention, make the second safety valve 11 have stable safety pressure, thus ensure that hydraulic system reliably works.
Above-described specific embodiment; object of the present invention, technological scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. there is a hydraulic system for stability and safety pressure, there is hydraulic oil container (1), Variable plunger pump (2), variable displacement mechanism (3), LS oil duct (4), the first safety valve (5), unloading overflow valve (6), T drainback passage (7) and some actuators (8) be set up in parallel; The inlet channel of described Variable plunger pump (2) is connected with hydraulic oil container (1), outlet passage is parallel with the first safety valve (5), unloading overflow valve (6) and some actuators (8); The left end of described variable displacement mechanism (3) is communicated with LS oil duct (4), and right-hand member is connected with the outlet of Variable plunger pump (2); Described first safety valve (5), unloading overflow valve (6) are communicated with T drainback passage (7) with the drainback passage of some actuators (8); Described T drainback passage (7) is connected with hydraulic oil container (1) by filtering cooling mechanism (9); It is characterized in that: also there is Ts drainback passage (10); One end of described Ts drainback passage (10) is communicated with LS oil duct (4) with permanent-flow valve (12) by the second safety valve (11) in parallel, and the other end is connected with hydraulic oil container (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310361521.5A CN104235094B (en) | 2013-08-19 | 2013-08-19 | There is the hydraulic system of stable safe pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310361521.5A CN104235094B (en) | 2013-08-19 | 2013-08-19 | There is the hydraulic system of stable safe pressure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104235094A true CN104235094A (en) | 2014-12-24 |
| CN104235094B CN104235094B (en) | 2016-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201310361521.5A Active CN104235094B (en) | 2013-08-19 | 2013-08-19 | There is the hydraulic system of stable safe pressure |
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| Country | Link |
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| CN (1) | CN104235094B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931896A (en) * | 2021-09-28 | 2022-01-14 | 中联重科股份有限公司 | Load port independent control load sensitive multi-way valve and hydraulic system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665699A (en) * | 1981-11-24 | 1987-05-19 | Linde Aktiengesellschaft | Hydrostatic drives |
| US5806312A (en) * | 1996-02-07 | 1998-09-15 | Mannesmann Rexroth S.A. | Multiple hydraulic distributor device |
| CN201218255Y (en) * | 2008-05-29 | 2009-04-08 | 广西柳工机械股份有限公司 | Front wheel driven hydraulic load sensing device of grader |
| CN202138574U (en) * | 2011-06-10 | 2012-02-08 | 湖南博伦多液压设备有限公司 | Hydraulic system of double-workstation paper roll package machine |
| CN202249733U (en) * | 2011-10-25 | 2012-05-30 | 无锡市安迈工程机械有限公司 | Hydraulic device of drill |
| CN203488464U (en) * | 2013-08-19 | 2014-03-19 | 江苏恒立液压有限公司 | Hydraulic system with stable and safe pressure |
-
2013
- 2013-08-19 CN CN201310361521.5A patent/CN104235094B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4665699A (en) * | 1981-11-24 | 1987-05-19 | Linde Aktiengesellschaft | Hydrostatic drives |
| US5806312A (en) * | 1996-02-07 | 1998-09-15 | Mannesmann Rexroth S.A. | Multiple hydraulic distributor device |
| CN201218255Y (en) * | 2008-05-29 | 2009-04-08 | 广西柳工机械股份有限公司 | Front wheel driven hydraulic load sensing device of grader |
| CN202138574U (en) * | 2011-06-10 | 2012-02-08 | 湖南博伦多液压设备有限公司 | Hydraulic system of double-workstation paper roll package machine |
| CN202249733U (en) * | 2011-10-25 | 2012-05-30 | 无锡市安迈工程机械有限公司 | Hydraulic device of drill |
| CN203488464U (en) * | 2013-08-19 | 2014-03-19 | 江苏恒立液压有限公司 | Hydraulic system with stable and safe pressure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113931896A (en) * | 2021-09-28 | 2022-01-14 | 中联重科股份有限公司 | Load port independent control load sensitive multi-way valve and hydraulic system |
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| Publication number | Publication date |
|---|---|
| CN104235094B (en) | 2016-08-10 |
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Address after: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant after: JIANGSU HENGLI HYDRAULIC CO., LTD. Address before: 213167 Wujin high tech Industrial Development Zone, Jiangsu Province, No. long hidden Road, No. 99 Applicant before: JIANGSU HENGLI HYDRAULIC CO., LTD. |
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