CN216742231U - Hydraulic system with stable flow regulation - Google Patents
Hydraulic system with stable flow regulation Download PDFInfo
- Publication number
- CN216742231U CN216742231U CN202123317045.6U CN202123317045U CN216742231U CN 216742231 U CN216742231 U CN 216742231U CN 202123317045 U CN202123317045 U CN 202123317045U CN 216742231 U CN216742231 U CN 216742231U
- Authority
- CN
- China
- Prior art keywords
- oil pump
- oil
- hydraulic system
- pilot
- flow
- 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.)
- Active
Links
Images
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The utility model discloses a hydraulic system for stably adjusting flow, which comprises an oil tank, an oil pump, an auxiliary oil pump, a one-way valve, a pilot control oil way and a pilot overflow valve, wherein the oil pump is arranged on the oil tank; the oil tank is connected respectively to the inlet of oil pump and supplementary oil pump, and the one end and the guide overflow valve of check valve are connected respectively to the liquid outlet of supplementary oil pump, and the one end of pilot control oil circuit is connected to the other end of check valve, and the G mouth of oil pump is connected to the other end of pilot control oil circuit, and the load is connected to the liquid outlet of oil pump. The utility model solves the problem that the discharge capacity of the oil pump is not adjustable when the system load is small, and increases the discharge capacity adjusting range of the oil pump.
Description
Technical Field
The utility model belongs to the technical field of hydraulic equipment, and particularly relates to a hydraulic system for stably adjusting flow.
Background
The hydraulic system for sludge pump, concrete pump and other equipment adopts an electrically controlled constant power regulating oil pump of Lishile company A11V series, and the electrically controlled regulation of the oil pump has the following characteristicsPoint: from the minimum displacement Vg minTo maximum displacement Vg maxThe control of (2) is increased along with the increase of the control current, and the displacement of the oil pump is automatically controlled by a PLC.
In practical applications, when the oil pump outputs a small displacement (typically below 15% of the maximum displacement), the flow regulation characteristics of the hydraulic system are poor. When the external load is small, the displacement of the hydraulic system cannot be adjusted, namely when the outlet pressure of the oil pump does not reach the minimum pressure of 30bar required by the swash plate control, the displacement of the oil pump cannot be adjusted. Even if the system pressure is greater than 30bar, the adjustable minimum displacement is approximately 13% of the maximum displacement, i.e. the minimum value of the displacement adjustment is 13% of the rated maximum displacement, and the displacement of the oil pump cannot be further adjusted downwards through the electric control system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a hydraulic system with stably regulated flow, and aims to solve the problem that the discharge capacity of an oil pump is not adjustable when the system load is small.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a hydraulic system for stably adjusting flow comprises an oil tank, an oil pump, an auxiliary oil pump, a one-way valve, a pilot control oil way and a pilot overflow valve;
the oil pump and the auxiliary oil pump are respectively connected with the oil tank, the liquid outlet of the auxiliary oil pump is respectively connected with one end of the one-way valve and the pilot operated overflow valve, the other end of the one-way valve is connected with one end of the pilot operated oil circuit, the other end of the pilot operated oil circuit is connected with the G port of the oil pump, and the liquid outlet of the oil pump is connected with a load.
In one embodiment, the oil pump comprises a proportional solenoid valve comprising a spool and a proportional electromagnet controlling the spool; wherein the proportion electromagnet is electrically connected with an electronic amplifier.
In one embodiment, the minimum displacement of the oil pump is less than its factory set minimum displacement.
In one embodiment, the pilot control oil path is provided with a damping hole.
In one embodiment, a liquid outlet of the auxiliary oil pump is further connected with a hydraulic gauge.
In one embodiment, an oil suction filter is arranged on a pipeline between the liquid inlets of the oil pump and the auxiliary oil pump and the oil tank.
In one embodiment, the system further comprises a motor for driving the oil pump and the auxiliary oil pump.
In one embodiment, the oil pump is an a11V oil pump.
The utility model has the advantages that:
according to the hydraulic system for stably adjusting the flow, provided by the utility model, on the premise of not damaging the oil pump, the minimum discharge capacity of the hydraulic system can be freely adjusted to be more than 5% of the rated maximum discharge capacity, the discharge capacity adjusting range of the oil pump is enlarged, and the problem that the discharge capacity of the oil pump is not adjustable when the system load is small is solved.
Drawings
FIG. 1 is a schematic diagram of a flow stabilizing regulated hydraulic system of the present invention;
fig. 2 is a schematic diagram of an electric control process of an oil pump according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The improved principle of the hydraulic system for stably regulating the flow is as follows: 1. adjusting a displacement limiting screw of the oil pump 4 to reduce the minimum displacement of the oil pump 4 which is set by a factory; 2. changing the output interval of the control current of the oil pump 4, and exploring to the actual requirement under the minimum current; 3. the G port of the oil pump 4 is connected with external control pilot oil, and the swash plate 45 of the oil pump 4 is controllable under small load and small displacement through the external pilot control oil. The hydraulic system for stably regulating the flow provided by the utility model is described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 illustrates a schematic structure of a flow-stabilizing regulated hydraulic system. As shown in fig. 1, the hydraulic system for stably adjusting the flow rate provided by the present embodiment includes an oil tank 1, an oil pump 4, an auxiliary oil pump 5, a check valve 8, a pilot oil path 9, a pilot overflow valve 6, a hydraulic pressure gauge 7, an oil suction filter 2, and a motor 3. The motor 3 is used for driving the oil pump 4 and the auxiliary oil pump 5, specifically, the motor 3 is connected with the a11V oil pump 4, and the a11V oil pump 4 is connected with the auxiliary oil pump 5 in series, and together suck oil from the oil tank 1 through the oil suction filter 2.
The oil pump 4 may be a swash plate plunger pump, a swash plate gear pump. In this embodiment, the a11V oil pump. The liquid inlets of the oil pump 4 and the auxiliary oil pump 5 are respectively connected with the oil tank 1 through pipelines, and the oil absorption filter 2 is arranged on the pipelines. The liquid outlet of the oil pump 4 is connected with a load. The liquid outlet of the auxiliary oil pump 5 is respectively connected with one end of a check valve 8, a pilot overflow valve 6 and a hydraulic gauge 7. The other end of the one-way valve 8 is connected with one end of the pilot control oil path 9, and the one-way valve 8 plays a role in non-return and prevents high-pressure oil from flowing back. The pilot control oil path 9 is provided with a damping hole 10, and the other end of the pilot control oil path 9 is connected with a port G of the oil pump 4. That is, the oil flowing out of the outlet of the auxiliary oil pump 5 enters the port G of the a11V oil pump 4 through the check valve 8, the pilot control oil passage 9, and the orifice 10. The pilot-operated overflow valve 6 is used for limiting the pressure of the liquid outlet of the auxiliary oil pump 5, and the hydraulic gauge 7 is used for displaying the pressure of the liquid outlet of the auxiliary oil pump 5.
The oil pump 4 includes a proportional solenoid valve 43, the proportional solenoid valve 43 including a spool 431 and a proportional electromagnet 432 that controls the spool 431; wherein the proportional electromagnet 432 is electrically connected to an electronic amplifier 433. The electronic amplifier 433 can adjust and control the current interval of the proportional electromagnet 432, and further adjust the minimum displacement of the oil pump 4.
The minimum displacement of the oil pump 4 is smaller than its factory set minimum displacement. Specifically, the oil pump 4 includes a swash plate 45, a large servo hydraulic cylinder 44, and a small servo hydraulic cylinder 42, and the large servo hydraulic cylinder 44 and the small servo hydraulic cylinder 42 are used to adjust the degree of inclination of the swash plate 45, thereby adjusting the displacement of the oil pump 4. The small servo hydraulic cylinder 42 corresponds to the minimum displacement limiting screw 41, and the minimum displacement of the oil pump 4 is smaller than the minimum displacement set by a factory by rotating the minimum displacement limiting screw 41.
In this embodiment, the a11V oil pump 4 is an electrically controlled constant power regulated oil pump driven by a belt shaft, and has a displacement range of 40-260ml/r, a nominal pressure of 350bar, a maximum pressure of 400bar, and a factory-leaving control current range of: 200-. The auxiliary oil pump 5 is a gear pump/plunger pump, the displacement of which is in the range of 10-40ml/r, and the nominal pressure is 210-280 bar. The pilot overflow valve 6 adjusts the pilot control oil pressure range to 30bar-180 bar. The hydraulic gauge 7 is a shock-proof pressure gauge, and the pressure measuring range is 0-600 bar. The opening pressure of the one-way valve 8 is 0.5bar, and the drift diameter range is as follows: DN8-DN15, maximum pressure up to 315 bar. The pilot control oil path 9 is a high-pressure woven hose. The range of the drift diameter of the damping hole 10 is DN3-DN 7.
When the hydraulic system with stable flow regulation provided by the embodiment is used, the motor 3 is started, and the oil pump 4 and the auxiliary oil pump 5 of the a11V suck hydraulic oil from the oil tank 1 through the oil suction filter 2. The hydraulic oil discharged from the auxiliary oil pump 5 enters the port G of the oil pump 4 a11V through the check valve 8, the pilot control oil passage 9, and the orifice 10. A part of the hydraulic oil introduced into the G port of the a11V oil pump 4 flows into the small servo hydraulic cylinder 42, and the other part thereof enters the large servo hydraulic cylinder 44 through the electric proportional regulating valve. The swash plate 45 is moved toward V by the small and large servo cylinders 42 and 44g minThe direction is moved. And then the minimum displacement limiting screw 41 of the A11V oil pump 4 is unscrewed properly for a plurality of circles, so that the factory-set minimum displacement of the A11V oil pump 4 is reduced, and the minimum displacement is 5% of the rated maximum displacement. Through the above embodiment, not only is the problem of nonadjustable system pressure low oil pump discharge capacity solved, but also the discharge capacity adjustment range of the oil pump 4 is enlarged.
Referring to fig. 2, fig. 2 illustrates an electric control flow of the oil pump. As shown in fig. 2, the electric control process of the oil pump in the present embodiment is as follows: A1-7.5V voltage signal is input to an electronic amplifier 433, a 170-600mA current signal is output after conversion by the electronic amplifier 433, the current signal acts on a proportional electromagnet 432, the proportional electromagnet 432 generates magnetic force, a valve core 431 is further pushed to move, pilot control oil enters a large servo hydraulic cylinder 44 and a small servo hydraulic cylinder 42 inside an oil pump 4, a swash plate 45 is further pushed to change, the displacement output by the A11V oil pump 4 under the 170mA minimum current is about 5% of the rated displacement of the oil pump 4, and the linear change with stable displacement is output along with the increase of control current.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the utility model, and the technical scheme after the changes or substitutions can fall into the protection scope of the utility model.
Claims (8)
1. A hydraulic system for stably adjusting flow is characterized by comprising an oil tank, an oil pump, an auxiliary oil pump, a one-way valve, a pilot control oil way and a pilot overflow valve;
the oil pump and the auxiliary oil pump are respectively connected with the oil tank, the liquid outlet of the auxiliary oil pump is respectively connected with one end of the one-way valve and the pilot operated overflow valve, the other end of the one-way valve is connected with one end of the pilot operated oil circuit, the other end of the pilot operated oil circuit is connected with the G port of the oil pump, and the liquid outlet of the oil pump is connected with a load.
2. The flow stabilizing regulated hydraulic system according to claim 1, wherein the oil pump includes a proportional solenoid valve including a spool and a proportional solenoid controlling the spool; wherein the proportional electromagnet is electrically connected with an electronic amplifier.
3. The flow stabilizing regulated hydraulic system according to claim 2, wherein the minimum displacement of the oil pump is less than its factory set minimum displacement.
4. The flow stability regulated hydraulic system of claim 1, wherein a damping orifice is provided on the pilot oil path.
5. The flow stabilizing and regulating hydraulic system as claimed in claim 1, wherein the outlet of the auxiliary oil pump is further connected to a hydraulic gauge.
6. The flow-stabilizing and regulating hydraulic system as claimed in claim 1, characterized in that the oil suction filter is arranged on the pipeline between the liquid inlets of the oil pump and the auxiliary oil pump and the oil tank.
7. The flow stability regulated hydraulic system of claim 1, further comprising a motor for driving the oil pump and auxiliary oil pump.
8. The flow stabilizing regulated hydraulic system of any one of claims 1 to 7, characterized in that the oil pump is an A11V oil pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123317045.6U CN216742231U (en) | 2021-12-27 | 2021-12-27 | Hydraulic system with stable flow regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123317045.6U CN216742231U (en) | 2021-12-27 | 2021-12-27 | Hydraulic system with stable flow regulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216742231U true CN216742231U (en) | 2022-06-14 |
Family
ID=81939148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123317045.6U Active CN216742231U (en) | 2021-12-27 | 2021-12-27 | Hydraulic system with stable flow regulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216742231U (en) |
-
2021
- 2021-12-27 CN CN202123317045.6U patent/CN216742231U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101167556B1 (en) | Number-of-compressors controlling system | |
| CN108980208B (en) | Ultrahigh-precision pressure control device | |
| CN101660519B (en) | Electrical feedback electro-hydraulic proportional pressure flux compound control method and variable output pump | |
| CN108083116A (en) | A kind of hydraulic control system for crane | |
| CN216742231U (en) | Hydraulic system with stable flow regulation | |
| CN107524642B (en) | A kind of force control hydraulic pressure energy saving of system method and its energy saver | |
| CN106438555B (en) | Hydraulic control valve and hydraulic system | |
| WO2023070969A1 (en) | Hydraulic control valve group, hydraulic system, and operation machine | |
| CN102032232B (en) | Proportional control type power limitation valve | |
| CN101994906A (en) | Flow stabilizing device | |
| CN107044458B (en) | A kind of ropeway fluid power system using accumulator pressure regulation | |
| CN210715336U (en) | Soft start hydrostatic driving system | |
| CN113757197B (en) | Constant pressure control method of pump station | |
| CN211366734U (en) | Variable pump hydraulic control system and crane | |
| JPH09126144A (en) | Operation method for variable speed feed water pump | |
| CN214581015U (en) | Gaseous state height adds hydrophobic accurate oxygenation device | |
| CN217325593U (en) | Multistage steady voltage water supply system | |
| CN209322394U (en) | The high-precision control for being used to support axle power, which carries, sets | |
| JP2019214007A (en) | Reverse osmosis membrane separation device | |
| CN206929146U (en) | A kind of ropeway fluid power system using accumulator pressure regulation | |
| CN200971837Y (en) | Plunger pump | |
| CN106593969B (en) | Electrohydraulic controlling mechanism | |
| CN109595214A (en) | Intelligent short ingot sawing unit manipulator adjusts the speed oil circuit | |
| CN216241552U (en) | Pumping hydraulic system and wet spraying machine | |
| CN217401313U (en) | Flap valve control device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |