CN107477039A - Hydraulic system and engineering machinery with flow-compensated function - Google Patents
Hydraulic system and engineering machinery with flow-compensated function Download PDFInfo
- Publication number
- CN107477039A CN107477039A CN201710690871.4A CN201710690871A CN107477039A CN 107477039 A CN107477039 A CN 107477039A CN 201710690871 A CN201710690871 A CN 201710690871A CN 107477039 A CN107477039 A CN 107477039A
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- Prior art keywords
- pressure
- valve
- compensation
- hydraulic system
- main pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The present invention relates to a kind of hydraulic system with flow-compensated function and the engineering machinery equipped with the hydraulic system, the hydraulic system to include：The main pump controlled in a manner of load sensing being connected with fuel tank；Executing agency；Main pump is connected with executing agency to be used for for the main control valve of executing agency's distribution hydraulic oil；Couple with main control valve so as to input the pilot pressure input block of pilot pressure to main control valve；Flow-compensated mechanism, it includes compensating pressure input block and flow compensation valve block, pressure input block is compensated to be used to input constant compensation pressure to flow compensation valve block, flow compensation valve block couples pilot pressure input block, compensation pressure input block, the load pressure output pipe of main control valve and the discharge capacity governor motion of main pump respectively, compensation pressure and load pressure are received in the case of for inputting pilot pressure in pilot pressure input block, and the greater compensated in pressure and load pressure is inputted into main pump to control the discharge capacity of main pump.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly to a kind of hydraulic system and equipment with flow-compensated function
There is the engineering machinery of the hydraulic system.
Background technology
Load sensing controlled is that the common control method of discharge of main pump is controlled in modern project machinery.So-called load sensing
Control, i.e., be controlled by pressure differential before and after detecting main control valve to discharge of main pump, constant pressure differential before and after maintenance main control valve,
To realize main pump according to system requirements delivery flow.In load sensing controlled system, the discharge capacity governor motion of main pump, for example lead
Pump swash plate stroking mechanism, which receives, carrys out self-supported signal so as to which discharge of main pump be adjusted in real time.But under some conditions, by
It is affected by gravity in some executing agencies, causes load pressure too low, the swash plate for controlling main pump by too low load pressure becomes
Measuring mechanism, the underfed that can so cause main pump to provide, causes executing agency to be emptied.
The content of the invention
The purpose of the present invention is one of at least to solve the above problems, and the purpose is achieved through the following technical solutions：
The present invention proposes a kind of hydraulic system with flow-compensated function, and the hydraulic system is used for engineering machinery, institute
Stating hydraulic system includes：
Main pump, the main pump are connected with fuel tank, for providing liquid in a manner of load sensing controlled for the hydraulic system
Force feed；
Executing agency；
Main control valve, the main control valve connect the main pump and the executing agency, for distributing liquid for the executing agency
Force feed；
Pilot pressure input block, the pilot pressure input block couple with the main control valve so as to the master
Control valve input pilot pressure；
Flow-compensated mechanism, the flow-compensated mechanism includes compensation pressure input block and flow compensation valve block, described
Compensate pressure input block to be used to input constant compensation pressure to the flow compensation valve block, the flow compensation valve block difference
Couple the pilot pressure input block, the compensation pressure input block, the main control valve load pressure output pipe and
The discharge capacity governor motion of the main pump, for the pilot pressure input block input pilot pressure in the case of receive described in
Pressure and load pressure are compensated, and the greater in the compensation pressure and the load pressure is inputted into the main pump to control
Make the discharge capacity of the main pump.
According to a modification of the present invention, the flow compensation valve block includes compensation pressure transfer valve and selected with pressure
Valve, the outlet of the first entrance connection compensation pressure transfer valve of the pressure selection valve, the second of the pressure selection valve
Entrance couples the load pressure output pipe of the main control valve, and the outlet of the pressure selection valve couples the discharge capacity tune of the main pump
Save mechanism；The compensation pressure transfer valve couples so as in the presence of pilot pressure with the pilot pressure input block
It is turned on and off, and the entrance of the compensation pressure transfer valve couples with the compensation pressure input block, the compensation pressure
The outlet of power transfer valve couples with the pressure selection valve so that the compensation pressure transfer valve can be in the effect of pilot pressure
It is lower to open so that the constant compensation pressure of the compensation pressure input block input is delivered to the pressure selection
Valve, the discharge capacity that the pressure selection valve inputs the greater in received compensation pressure and load pressure the main pump are adjusted
Mechanism is saved to control the discharge capacity of the main pump.
Preferably, the compensation pressure transfer valve is pilot operated directional control valve, and the pressure selection valve is shuttle valve.
It is further preferred that the pilot operated directional control valve is hydraulic control two position three-way valve.
Another according to the present invention improves, and the flow compensation valve block includes compensation pressure transfer valve and pressure selection
Valve, the outlet of the first entrance connection compensation pressure transfer valve of the pressure selection valve, the second of the pressure selection valve
Entrance couples the load pressure output pipe of the main control valve, and the outlet of the pressure selection valve couples the discharge capacity tune of the main pump
Save mechanism；The entrance of the compensation pressure transfer valve couples with the compensation pressure input block, the compensation pressure transfer valve
Outlet couple with the pressure selection valve；The hydraulic system also includes ECU, the compensation pressure transfer valve and institute
Pilot pressure input block is stated respectively with the ECU to couple so that when the pilot pressure input block operates, institute
State the ECU control compensation pressure transfer valve to open, so that the compensation pressure input block input is described constant
Compensation pressure be delivered to the pressure selection valve, the pressure selection valve is by received compensation pressure and load pressure
In the greater input the discharge capacity governor motion of the main pump to control the discharge capacity of the main pump.
Preferably, the compensation pressure transfer valve is solenoid directional control valve, and the pressure selection valve is shuttle valve.
It is further preferred that the pilot operated directional control valve is electromagnetism two position three-way valve.
According to a kind of advantageous embodiment of the present invention, the compensation pressure value is 35bar.
According to another improvement of the present invention, the compensation pressure input block is the gear with the main pump simultaneously operating
Pump.
In addition, the invention further relates to a kind of engineering machinery, the engineering machinery has above-mentioned hydraulic system.
The advantage of the invention is that：The hydraulic system with flow-compensated function of the present invention is by increasing flow-compensated machine
Structure, the automatic compensation function to flow can be realized under the relatively low operating mode of the load pressure of hydraulic system.It is and flow-compensated
The structure of mechanism is simple, and it is that automatically adjusting for convection current amount can be achieved not need operation bidirectional, easy to use, can be advantageously
Applied to the hydraulic system of load sensing controlled, there is extensive market application foreground.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows the schematic diagram of the hydraulic system with flow-compensated function according to embodiment of the present invention.
Embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.Conversely, there is provided these embodiments are to be able to be best understood from the disclosure, and can be by this public affairs
The scope opened completely is communicated to those skilled in the art.
According to the embodiment of the present invention, a kind of hydraulic pressure system with flow-compensated function for engineering machinery is proposed
System, as shown in figure 1, the hydraulic system includes：It is connected with fuel tank so as to be provided in a manner of load sensing controlled for hydraulic system
The main pump 1 of hydraulic oil, executing agency 3, main control valve 2, the pilot pressure input unit for inputting pilot pressure to the main control valve 2
Part and flow-compensated mechanism.Wherein, main control valve 2 connects main pump 1 and executing agency 3, for the hydraulic oil distribution for exporting main pump 1
To executing agency 3.Flow-compensated mechanism includes compensation pressure input block (not shown) and flow compensation valve block 4.According to this hair
Bright preferred embodiment, compensation pressure input block are gear pumps with main pump simultaneously operating, and gear pump and main pump can be with
By engine driving, the gear pump can input the compensation pressure of values constant, the compensation pressure value to flow compensation valve block
It is set so as to be enough to ensure that the flow that main pump provides at this pressure can avoid executing agency from being emptied, according to the present invention
Preferred embodiment, the compensation pressure value is set to 35bar, it will be appreciated, however, that the compensation pressure value can be with
According to the characteristics of the engineering machinery of the hydraulic system of the equipment present invention and its executing agency and specific works environment is set to it
His numerical value.According to a kind of preferred embodiment of the present invention, flow compensation valve block 4 includes pilot operated directional control valve 5 and shuttle valve 6, makees
Can be hydraulic control two position three-way valve as shown in Figure 1 to compensate the pilot operated directional control valve 5 of pressure transfer valve, pilot operated directional control valve 5 couples
Pilot pressure input block, such as pilot handle by the fluid pressure of pilot pressure input block so as to realizing reversing work
Energy；The entrance of pilot operated directional control valve 5 couples with compensation pressure input block, and the one outlet of pilot operated directional control valve 5 is attached to shuttle valve 6
First entrance, another outlet can take back fuel tank.Therefore in the case where pilot pressure input block inputs pilot pressure, liquid
Control reversal valve 5 be in opening in the presence of fluid pressure, that is, connect as the gear pump for compensating pressure input block and
As the shuttle valve of pressure selection valve, so that the compensation pressure of the values constant of gear pump input is via the quilt of pilot operated directional control valve 5
It is delivered to shuttle valve 6.Load pressure intake line of the second entrance connection from main control valve 2 of shuttle valve 6, so as to automatically will
The greater in compensation pressure and load pressure is delivered to main pump 1, such as is delivered to the swash plate stroking mechanism of main pump 1, the swash plate
Stroking mechanism is the discharge capacity governor motion of main pump 1, therefore can be adjusted based on load sensing controlled principle according to the pressure of the input
The discharge capacity of main pump is saved, to ensure that executing agency will not be emptied under the discharge capacity.In other words, when pilot pressure input block is defeated
When entering pilot pressure, pilot pressure had both manipulated main control valve 2, while again opened the pilot operated directional control valve 5 in flow compensation valve block 4.
It is achieved that as long as carry out is pilot operated, the flow-compensated of flow-compensated mechanism is that can realize the automatic compensation work(to flow
Energy.
According to a kind of alternative embodiment of the present invention, the hydraulic system with flow-compensated function of the invention is also wrapped
ECU is included, and replaces the pilot operated directional control valve in flow compensation valve block to be used as compensation pressure input valve portion by the use of solenoid directional control valve
Part, such as electromagnetism two position three-way valve.Solenoid directional control valve and pilot pressure input block couple with ECU respectively, work as pilot pressure
When input block, the operation of such as pilot handle, ECU receives the operation signal of pilot pressure input block so as to controlling electricity
Magnetic reversal valve is opened so that inputs shuttle valve by the solenoid directional control valve of opening by the compensation pressure of the values constant of gear pump input
6, shuttle valve 6 by compensation pressure that this is received and load pressure that opposite side is inputted by main control valve 2 automatically compared with and by two
The greater in person inputs main pump 1 so as to control the discharge capacity of main pump.
By aforesaid operations, in the case where compensation pressure is set as into constant 35bar as described above, if input shuttle
The load pressure of valve is more than the discharge capacity that 35bar then controls main pump by load pressure, if the load pressure of input shuttle valve is less than
Or equal to 35bar then with 35bar control main pump discharge capacity, so as to ensure the flow of hydraulic system can prevent executing agency due to
Underfed is emptied.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (10)
1. a kind of hydraulic system with flow-compensated function, the hydraulic system are used for engineering machinery, it is characterised in that described
Hydraulic system includes：
Main pump, the main pump are connected with fuel tank, for providing hydraulic oil in a manner of load sensing controlled for the hydraulic system；
Executing agency；
Main control valve, the main control valve connect the main pump and the executing agency, for distributing hydraulic oil for the executing agency；
Pilot pressure input block, the pilot pressure input block couple with the main control valve so as to the main control valve
Input pilot pressure；
Flow-compensated mechanism, the flow-compensated mechanism include compensation pressure input block and flow compensation valve block, the compensation
Pressure input block is used to input constant compensation pressure to the flow compensation valve block, and the flow compensation valve block couples respectively
The pilot pressure input block, the compensation pressure input block, the load pressure output pipe of the main control valve and described
The discharge capacity governor motion of main pump, for receiving the compensation in the case of pilot pressure input block input pilot pressure
Pressure and load pressure, and the greater in the compensation pressure and the load pressure is inputted into the main pump to control
State the discharge capacity of main pump.
2. hydraulic system according to claim 1, it is characterised in that the flow compensation valve block includes compensation pressure input
Valve and and pressure selection valve, the pressure selection valve first entrance connection it is described compensation pressure transfer valve outlet, the pressure
The second entrance of power selector valve couples the load pressure output pipe of the main control valve, the outlet connection institute of the pressure selection valve
State the discharge capacity governor motion of main pump；The compensation pressure transfer valve couples so as to first with the pilot pressure input block
It is turned on and off in the presence of pilot power, and the entrance of the compensation pressure transfer valve joins with the compensation pressure input block
Connect, the outlet of the compensation pressure transfer valve couples with the pressure selection valve so that the pressure transfer valve of compensating can be
Opened in the presence of pilot pressure so that the constant compensation pressure of the compensation pressure input block input is delivered
To the pressure selection valve, the greater in received compensation pressure and load pressure is inputted institute by the pressure selection valve
The discharge capacity governor motion of main pump is stated to control the discharge capacity of the main pump.
3. hydraulic system according to claim 2, it is characterised in that the compensation pressure transfer valve is pilot operated directional control valve,
The pressure selection valve is shuttle valve.
4. hydraulic system according to claim 3, it is characterised in that the pilot operated directional control valve is hydraulic control two position three-way valve.
5. hydraulic system according to claim 1, it is characterised in that the flow compensation valve block includes compensation pressure input
Valve and pressure selection valve, the outlet of the first entrance connection compensation pressure transfer valve of the pressure selection valve, the pressure
The second entrance of selector valve couples the load pressure output pipe of the main control valve, described in the outlet connection of the pressure selection valve
The discharge capacity governor motion of main pump；The entrance of the compensation pressure transfer valve couples with the compensation pressure input block, the benefit
The outlet for repaying pressure transfer valve couples with the pressure selection valve；The hydraulic system also includes ECU, the compensation pressure
Power transfer valve and the pilot pressure input block couple with the ECU respectively so that when the pilot pressure input unit
When part operates, the ECU control compensation pressure transfer valve is opened, so that the compensation pressure input block is defeated
The constant compensation pressure entered is delivered to the pressure selection valve, and the pressure selection valve is by received compensation pressure
The greater in power and load pressure inputs the discharge capacity governor motion of the main pump to control the discharge capacity of the main pump.
6. hydraulic system according to claim 5, it is characterised in that the compensation pressure transfer valve is solenoid directional control valve,
The pressure selection valve is shuttle valve.
7. hydraulic system according to claim 6, it is characterised in that the pilot operated directional control valve is electromagnetism two position three-way valve.
8. hydraulic system according to claim 1, it is characterised in that the compensation pressure value is 35bar.
9. the hydraulic system according to any one of claim 1 to 8, it is characterised in that the compensation pressure input unit
Part is the gear pump with the main pump simultaneously operating.
A kind of 10. engineering machinery, it is characterised in that any one of described with good grounds claim 1 to 9 of engineering machinery institute
The hydraulic system stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710690871.4A CN107477039B (en) | 2017-08-14 | 2017-08-14 | Hydraulic system with flow compensation function and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710690871.4A CN107477039B (en) | 2017-08-14 | 2017-08-14 | Hydraulic system with flow compensation function and engineering machinery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107477039A true CN107477039A (en) | 2017-12-15 |
| CN107477039B CN107477039B (en) | 2020-01-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710690871.4A Active CN107477039B (en) | 2017-08-14 | 2017-08-14 | Hydraulic system with flow compensation function and engineering machinery |
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| Country | Link |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103097743A (en) * | 2010-09-09 | 2013-05-08 | 沃尔沃建造设备有限公司 | Flow rate control device for variable displacement type hydraulic pump for construction equipment |
| US20160138620A1 (en) * | 2014-05-26 | 2016-05-19 | Kyb Corporation | Load sensing control circuit |
| CN106224306A (en) * | 2016-09-29 | 2016-12-14 | 徐工集团工程机械股份有限公司科技分公司 | There is the hydraulic system of flow-compensated function |
| CN106438527A (en) * | 2016-11-16 | 2017-02-22 | 中航力源液压股份有限公司 | Flow compensation method and flow compensation device for proportional control pump |
| CN106715801A (en) * | 2014-09-19 | 2017-05-24 | 沃尔沃建造设备有限公司 | Hydraulic circuit for construction equipment |
-
2017
- 2017-08-14 CN CN201710690871.4A patent/CN107477039B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103097743A (en) * | 2010-09-09 | 2013-05-08 | 沃尔沃建造设备有限公司 | Flow rate control device for variable displacement type hydraulic pump for construction equipment |
| US20160138620A1 (en) * | 2014-05-26 | 2016-05-19 | Kyb Corporation | Load sensing control circuit |
| CN106715801A (en) * | 2014-09-19 | 2017-05-24 | 沃尔沃建造设备有限公司 | Hydraulic circuit for construction equipment |
| CN106224306A (en) * | 2016-09-29 | 2016-12-14 | 徐工集团工程机械股份有限公司科技分公司 | There is the hydraulic system of flow-compensated function |
| CN106438527A (en) * | 2016-11-16 | 2017-02-22 | 中航力源液压股份有限公司 | Flow compensation method and flow compensation device for proportional control pump |
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| Publication number | Publication date |
|---|---|
| CN107477039B (en) | 2020-01-03 |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |