CN203214469U - Single-power hydraulic source constant flow pump pressure compensating device - Google Patents

Single-power hydraulic source constant flow pump pressure compensating device Download PDF

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Publication number
CN203214469U
CN203214469U CN 201320226483 CN201320226483U CN203214469U CN 203214469 U CN203214469 U CN 203214469U CN 201320226483 CN201320226483 CN 201320226483 CN 201320226483 U CN201320226483 U CN 201320226483U CN 203214469 U CN203214469 U CN 203214469U
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CN
China
Prior art keywords
valve
pump
flow pump
constant flow
constant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201320226483
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Chinese (zh)
Inventor
罗艳蕾
陈伦军
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Guizhou University
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Guizhou University
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Priority to CN 201320226483 priority Critical patent/CN203214469U/en
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Publication of CN203214469U publication Critical patent/CN203214469U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a single-power hydraulic source constant flow pump pressure compensating device, which comprises a constant flow pump and an oil tank, wherein a safety valve and multi-path valves are connected to the outlet end of the constant flow pump respectively; one-way valves are arranged at the inlet ends of the multi-path valves; an unloading valve and a constant-difference overflow valve which are connected in parallel with the multi-path valves are further arranged; one of control oil circuits of the unloading valve and the constant-difference overflow valve is taken from the inlet of the multi-path valves; the other control circuit connected with the unloading valve and the constant-difference overflow valve is taken from the outlet end of a shuttle valve; the outlets of the multi-path valves are connected to the shuttle valve; all oil circuit loops are connected with the oil tank. The pressure compensating device is applied to a single-pump constant flow pump system, is simple in structure and is low in cost, can meet basic working requirements of engineering machinery, and is an efficient energy-saving pump source system with a pressure compensating function; moreover, the advantage of pressure compensation can be brought into play, and the system has high operability and energy-saving property.

Description

A kind of single action power hydraulic power metering pump pressure compensator
Technical field
The utility model relates to a kind of mechanical field, particularly a kind of single action power hydraulic power metering pump pressure compensator.
Background technique
The load sensing variable pump systems has a lot of concrete an application industrial, pressure compensation control in the load sensing variable pump systems is to realize respectively moving assignment of traffic and the accurately assurance of control, it guarantees that when pump duty is sufficient the flow that each final controlling element obtains is identical with the instruction of guide's handle, the work of assurance security coordination.But the present common structure of pressure compensation structure is all comparatively complicated, and the cost height, is subjected to certain restriction in Application in Manufacturing Construction Machinery.
Summary of the invention
Technical problem to be solved in the utility model is: a kind of single action power hydraulic power metering pump pressure compensator is provided, and it is applicable to Constant Pump System, forms simply, and cost is low, and having well can handling and energy saving, to overcome the deficiencies in the prior art.
The single action power hydraulic power metering pump pressure compensator that is achieved in that of the present utility model comprises metering pump, and fuel tank is connected with safety valve and multi-way valve respectively at the outlet end of metering pump, is provided with one-way valve at the entrance point of multi-way valve; Also be provided with the unloading valve in parallel with multi-way valve and constant difference overflow valve, one tunnel import of taking from multi-way valve of the control oil circuit of unloading valve and constant difference overflow valve; The outlet end of shuttle valve is taken from another road that connects the control oil circuit of unloading valve and constant difference overflow valve, and the outlet of multi-way valve all is connected on the shuttle valve; All oil circuit loops all are connected with fuel tank.
The utility model adopts single quantitative hydraulic pump to drive, and realizes the compound motion of many actuators.When system worked under big flow, system did not have throttling, and system's pressure maximum is set up by the pump discharge safety valve, realizes the security of system protection.Because system adopts pressure compensation, therefore the multi-way valve meta is worked as all actuators and is not worked for closing division center; oil hydraulic pump does not need to shut down; the fluid that pump is got rid of directly flows back to fuel tank by unloading valve, and this moment, the unloading valve set pressure was very low, reduced the meta energy loss of system.Delivery side of pump pressure equals the set pressure that system's maximum load circuit pressure adds constant difference overflow valve, realizes system pressure control.The valve core movement of operation system multi-way valve, the proportional output control of feasible system output flow and spool travel.
The Throttle Principle of the unnecessary flow of system: engine-driving metering pump, in its power range, the flow of metering pump output is constant, rate request is not high when a certain loop actuator, system need realize the throttling of unnecessary flow, the multi-way valve chock pressure difference is set up by constant difference overflow valve, and its value is less, and restriction loss is little; With unnecessary flow oil sump tank, this moment, the oil pressure relief of system was the oil hydraulic pump outlet pressure, rather than set pressure for safety valve in the system by constant difference overflow valve in system, and spill losses is little.
The loading speed characteristic: the inlet outlet pressure differential of multi-way valve is realized constant control by constant difference overflow valve in the loop, guarantees the speed control irrelevant with load.Particularly during the little opening of multi-way valve, the pressure reduction of its import and export does not change with the variation of load, and low cruise is steady, and the driver is easy to the fine setting of the speed that realizes, system has well can handling and fine setting characteristic.
Owing to adopted technique scheme, compared with prior art, the utility model is used for single pump Constant Pump System, it forms simple, with low cost, the engineering machinery basic work requirement can be finished, and pressure compensated advantage can be brought into play, make system have good can handling and energy saving, be a kind of pressure compensated energy-efficient pump source system that has.Compare with common throttle control system, have advantages such as handling good, efficient energy-saving; And owing to adopted pressure compensation, therefore can realize driving plural work loop by a pump.Compare with the load sensing pump control system, have simple in structure, low cost and other advantages.The utility model can reduce the application cost of construction machinery hydraulic system greatly, can be applicable to field in the engineering machinery such as excavator, loader, hoist, bulldozer, pump truck.
Description of drawings
Accompanying drawing 1 is structural representation of the present utility model;
Accompanying drawing 2 is schematic diagram of the present utility model.
Embodiment
Embodiment of the present utility model: the structure of single action power hydraulic power metering pump pressure compensator comprises metering pump 1 as shown in Figure 1, and fuel tank 5 is connected with safety valve 2 and multi-way valve 6 respectively at the outlet end of metering pump 1, is provided with one-way valve 7 at the entrance point of multi-way valve 6; Also be provided with unloading valve 3 and the constant difference overflow valve 4 in parallel with multi-way valve 6, one tunnel import of taking from multi-way valve 6 of the control oil circuit of unloading valve 3 and constant difference overflow valve 4; The outlet end of shuttle valve 8 is taken from another road that connects the control oil circuit of unloading valve 3 and constant difference overflow valve 4, and the outlet of multi-way valve 6 all is connected on the shuttle valve 8; All oil circuit loops all are connected with fuel tank 5.

Claims (1)

1. single action power hydraulic power metering pump pressure compensator, comprise metering pump (1), fuel tank (5) is characterized in that: the outlet end at metering pump (1) is connected with safety valve (2) and multi-way valve (6) respectively, is provided with one-way valve (7) at the entrance point of multi-way valve (6); Also be provided with unloading valve (3) and the constant difference overflow valve (4) in parallel with multi-way valve (6), a road of the control oil circuit of unloading valve (3) and constant difference overflow valve (4) is taken from the import of multi-way valve (6); The outlet end of shuttle valve (8) is taken from another road that connects the control oil circuit of unloading valve (3) and constant difference overflow valve (4), and the outlet of multi-way valve (6) all is connected on the shuttle valve (8); All oil circuit loops all are connected with fuel tank (5).
CN 201320226483 2013-04-28 2013-04-28 Single-power hydraulic source constant flow pump pressure compensating device Expired - Fee Related CN203214469U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320226483 CN203214469U (en) 2013-04-28 2013-04-28 Single-power hydraulic source constant flow pump pressure compensating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320226483 CN203214469U (en) 2013-04-28 2013-04-28 Single-power hydraulic source constant flow pump pressure compensating device

Publications (1)

Publication Number Publication Date
CN203214469U true CN203214469U (en) 2013-09-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320226483 Expired - Fee Related CN203214469U (en) 2013-04-28 2013-04-28 Single-power hydraulic source constant flow pump pressure compensating device

Country Status (1)

Country Link
CN (1) CN203214469U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104386618A (en) * 2014-09-18 2015-03-04 芜湖高昌液压机电技术有限公司 Pressure compensating unloading loop of shearing type lifting machine
CN109114058A (en) * 2018-09-13 2019-01-01 北京天地玛珂电液控制系统有限公司 The discharge mechanism of hydraulic system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104386618A (en) * 2014-09-18 2015-03-04 芜湖高昌液压机电技术有限公司 Pressure compensating unloading loop of shearing type lifting machine
CN109114058A (en) * 2018-09-13 2019-01-01 北京天地玛珂电液控制系统有限公司 The discharge mechanism of hydraulic system

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C14 Grant of patent or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130925

Termination date: 20160428