CN102141040A - Multi-gear pump stepped variable system - Google Patents
Multi-gear pump stepped variable system Download PDFInfo
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- CN102141040A CN102141040A CN2011101075783A CN201110107578A CN102141040A CN 102141040 A CN102141040 A CN 102141040A CN 2011101075783 A CN2011101075783 A CN 2011101075783A CN 201110107578 A CN201110107578 A CN 201110107578A CN 102141040 A CN102141040 A CN 102141040A
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- pump
- gear pump
- gear
- solenoid directional
- variable system
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Abstract
The invention relates to a multi-gear pump stepped variable system which belongs to the field of pumps. The invention aims at providing a multi-gear pump stepped variable system for realizing stepped regulation of displacement by utilizing the combination of a plurality of gear pumps with different displacements. The multi-gear pump stepped variable system comprises at least three gear pumps with different displacements and at least three electromagnetic reversing valves, wherein each gear pump is provided with an independent oil discharge outlet, the oil discharge outlet of each gear pump is connected with an oil inlet of the electromagnetic reversing valves, and the other two oil ports of the electromagnetic reversing valves are respectively communicated with an oil tank and a main oil discharge port. The on-off of the electromagnetic reversing valves can be controlled by a single-chip machine, a PLC (Programmable Logic Controller) or a computer and the like so that each gear pump is controlled to supply oil to the system or not, thereby realizing that the flow of the system is controlled by utilizing a smaller displacement variation gradient.
Description
Technical field
The invention belongs to the pump field.
Background technique
Hydraulic transmission is to be a special kind of skill science of working medium conversion, transmission, distribution and the control of carrying out energy with liquid.It utilizes oil hydraulic pump that the mechanical energy of prime mover is converted to the pressure energy of liquid, can be converted to mechanical energy to fluid pressure by means of hydraulic actuator (cylinder or motor), thereby drives operation mechanism, realizes straight reciprocating motion and rotation motion.And often there is various requirement in operation mechanism to power and speed, so need various control valves of process and pipeline to transmitting and distributing.Hydraulic transmission is widely used in fields such as lathe, automobile, aircraft, boats and ships, engineering machinery, plastics machinery, test machines, metallurgical machinery and mining machinery with the incomparable advantage of other kind of drive.
In hydraulic transmission technology, often need regulate, satisfy the requirement of operation mechanism with the speed of control actuating component the flow of liquid.Modal method is: 1, utilize flow control valve to regulate, the subject matter that this method exists is that power loss is big, should not be applied to powerful occasion; 2, adopt variable pump systems, the variable displacement pump of the most normal application at present is an axial piston pump, this Flow-rate adjustment mode has higher efficient, be widely used in powerful occasion, but it is, abominable for some operating modes, to the high occasion of reliability requirement and not exclusively be suitable for because the Variable plunger pump complex structure, anti-oil contamination ability is low, cost is high, poor reliability.
Less demanding at some to flow control accuracy, but need high reliability, low cost, the occasion lower to the oil cleanliness requirement, as the machinery of oil-field oil pumper, the big inertial mass of low speed etc., the demand that the flow control system that need a kind ofly to control conveniently, cost is low and reliability is high comes adaptive system.
Summary of the invention
The objective of the invention is to utilize the combination of the gear pump of a plurality of different displacements, a hydraulic power supply that provides a kind of discharge capacity can have level to change realizes that the multiple gearpump that has level to regulate of discharge capacity has a grade variable system.
The present invention includes the gear pump of at least three different displacements, at least three solenoid directional control valves, each gear pump has independent oil drain out, the oil drain out of each gear pump connects the filler opening of solenoid directional control valve, and two hydraulic fluid ports in addition of solenoid directional control valve communicate with total oil drain out with fuel tank respectively.
A prime mover driven is used in the coaxial connection of all gear pumps of the present invention.
Pump delivery of the present invention is arranged with Geometric Sequence, and what gear pumps are arranged, and just has how many power kind pump deliveries of two, and is that step pitch makes pump delivery have level to change with the pump delivery of minimum.
The present invention enters system or flows back to fuel tank by the fluid that the electromagnetism power on/off is discharged each pump, and pump delivery has level to change.
The present invention is by the power on/off of single-chip microcomputer, PLC or computer control solenoid directional control valve.
The present invention can pass through the break-make of control solenoid directional control valves such as single-chip microcomputer, PLC or computer, and then whether controls each gear pump to system's fuel feeding, realizes the flow with less displacement variation gradient control system.Because gear pump has simple in structure, low price, therefore the strong advantage of anti-oil contamination ability is used for replacing plunger type variable capacity pump, be applied to flow control accuracy less demandingly, but need high reliability, low cost, the occasion lower the oil cleanliness requirement.
Description of drawings
Fig. 1 is that n connection gear pump of the present invention has a grade variable delivery hydraulic system schematic diagram;
Fig. 2 is a pump displacement change curve of the present invention;
Fig. 3 is that triple gear pump of the present invention has a grade variable delivery hydraulic system schematic diagram.
Embodiment
The present invention includes gear pump 1(q1, q2, the q3 of at least three different displacements ... .qn), at least three solenoid directional control valve 2(1DT, 2DT, 3DT ... ..nDT), each gear pump 1 has independent oil drain out 4, the oil drain out 4 of each gear pump 1 connects the filler opening 5 of solenoid directional control valve 2, and other two hydraulic fluid ports 6 and 7 of solenoid directional control valve 2 communicate with total oil drain out 8 with fuel tank 3 respectively.Total oil drain out 8 communicates and communicates with the L of system, and oil extraction is just sent into system through total oil drain out.
A prime mover driven is used in the coaxial connection of all gear pumps of the present invention.Prime mover is meant power input devices such as motor, motor.
Pump delivery of the present invention is arranged with Geometric Sequence, and what gear pumps are arranged, and just has how many power kind pump deliveries of two, and is that step pitch makes pump delivery have level to change with the pump delivery of minimum.
The present invention enters system or flows back to fuel tank by the fluid that the electromagnetism power on/off is discharged each pump, and pump delivery has level to change.
The present invention is by the power on/off of single-chip microcomputer, PLC or computer control control system solenoid directional control valve.
The present invention will be further described below in conjunction with accompanying drawing:
N gear pump adopts axis to drive, and the inlet port of each pump links to each other with fuel tank respectively, and outlet connects the filler opening of a two-bit triplet solenoid directional control valve respectively, and two hydraulic fluid ports in addition of each solenoid directional control valve communicate with fuel tank and total oil drain out respectively.
As shown in Figure 1 (q1〉q2〉q3 ... qn), when the electromagnet of each solenoid directional control valve is in off-position, solenoid directional control valve is in shown position, the fluid that this moment, each gear pump was discharged directly flows back to fuel tank through solenoid directional control valve, be in unloading condition, because pump discharge pressure is very low, thus be in unloading condition pumping loss power also seldom, the flow that enter the L of system this moment is 0.
When having only electromagnet 1DT energising, corresponding solenoid directional control valve commutation, discharge capacity is that the fluid that the pump of q1 is discharged enters system, and other pump is in unloading condition, and enter discharge capacity this moment is q1.
When having only electromagnet 2DT energising, corresponding solenoid directional control valve commutation, discharge capacity is that the fluid that the pump of q2 is discharged enters system, and other pump is in unloading condition, and be q2 for discharge capacity this moment.
When electromagnet 1DT, 2DT switch on, two corresponding solenoid directional control valve commutations, discharge capacity is that the fluid that the pump of q1, q2 is discharged enters system, and other pump is in unloading condition, and this moment, discharge capacity was q1+q2.
When having only electromagnet 3DT energising, corresponding solenoid directional control valve commutation, discharge capacity is that the fluid that the pump of q3 is discharged enters system, and other pump is in unloading condition, and this moment, discharge capacity was q3.
When electromagnet 1DT, 3DT switch on, two corresponding solenoid directional control valve commutations, discharge capacity is that the fluid that the pump of q1, q3 is discharged enters system, and other pump is in unloading condition, and this moment, discharge capacity was q1+q3.
When electromagnet 2DT, 3DT switch on, two corresponding solenoid directional control valve commutations, discharge capacity is that the fluid that the pump of q2, q3 is discharged enters system, and other pump is in unloading condition, and this moment, discharge capacity was q2+q3.
When electromagnet 1DT, 2DT, 3DT energising, three corresponding solenoid directional control valve commutations, discharge capacity is that the fluid that the pump of q1, q2, q3 is discharged enters system, and other pump is in unloading condition, and this moment, discharge capacity was q1+q2+q3.
By that analogy, by gear pump and n the system that solenoid directional control valve is formed of n different displacements, the power on/off state according to n solenoid valve can be combined into 2 altogether like this
nPlant pump delivery.But, unreasonable if this n gear pump delivery selected, this 2
nPlant pump delivery and identical situation will occur, take place for fear of this situation, n gear pump delivery should be arranged with the form of Geometric Sequence, pump delivery variation meeting is that step pitch changes with the pump delivery q1 of minimum like this, and the value of pump displacement is 0, q1,2q1,3q1 ..., (n-1) q1.The working procedure of system is equivalent to the discretization process to a discharge curve of regulating continuously, as shown in Figure 2.
According to this relation, can adopt single-chip microcomputer, PLC or computer, control a plurality of solenoid directional control valves according to the actual demand of system, realize that the level that has of pump delivery is regulated.Since this moment be controlled to be simple logic control (be break-make control), therefore implement fairly simple.
Grade variable system of forming with three gear pumps that has is that example illustrates its working procedure below:
Shown in Fig. 2 and table 1.The inlet port of three gear pumps (discharge capacity be respectively 5,10,20mL/r) links to each other with fuel tank respectively, and outlet connects the filler opening of a two-bit triplet solenoid directional control valve respectively, and two hydraulic fluid ports in addition of each solenoid directional control valve communicate with fuel tank and total oil drain out respectively.
Table 1
| 1DT | 2DT | 3DT | Discharge capacity (mL/r) |
| — | — | — | 0 |
| + | — | — | 5 |
| — | + | — | 10 |
| + | + | — | 15 |
| — | — | + | 20 |
| + | — | + | 25 |
| — | + | + | 30 |
| + | + | + | 35 |
When three electromagnet all (table 1 first row) during no electric circuit, the fluid of three gear pump discharges flows back to fuel tank (being in unloading condition) by selector valve respectively, the fluid that this moment, three gear pumps were discharged directly flows back to fuel tank by selector valve, pressure is very low, so power loss is very little, do not have flow in the system this moment.
When electromagnet 1DT energising, and other two electromagnet are when all cutting off the power supply (table 1 second row), discharge capacity is that the fluid that the gear pump of 5mL/r is discharged enters total oil exit pipe to system's fuel feeding, and other two pumps are in unloading condition, the pump that be equivalent to a discharge capacity this moment is 5mL/r.
When electromagnet 2DT energising, and other two electromagnet are when all cutting off the power supply (table 1 the third line), discharge capacity is that the fluid that the gear pump of 10mL/r is discharged enters total oil exit pipe to system's fuel feeding, and other two pumps are in unloading condition, the pump that be equivalent to a discharge capacity this moment is 10mL/r.
When electromagnet 1DT, 2DT energising, and electromagnet 3DT when outage (table 1 fourth line), discharge capacity is that the fluid that the gear pump of 5mL/r, 10mL/r is discharged enters total oil exit pipe to system's fuel feeding, and discharge capacity is in unloading condition for the 20mL/r pump, the pump that be equivalent to a discharge capacity this moment is 15mL/r.
When electromagnet 3DT energising, and other two electromagnet are when all cutting off the power supply (table 1 fifth line), discharge capacity is that the fluid that the gear pump of 20mL/r is discharged enters total oil exit pipe to system's fuel feeding, and other two pumps are in unloading condition, the pump that be equivalent to a discharge capacity this moment is 20mL/r.
When electromagnet 1DT, 3DT energising, and electromagnet 2DT when outage (table 1 the 6th row), discharge capacity is that the fluid that the gear pump of 5mL/r, 20mL/r is discharged enters total oil exit pipe to system's fuel feeding, and discharge capacity is in unloading condition for the 100mL/r pump, the pump that be equivalent to a discharge capacity this moment is 25mL/r.
When electromagnet 2DT, 3DT energising, and electromagnet 1DT when outage (table 1 the 7th row), discharge capacity is that the fluid that the gear pump of 10mL/r, 20mL/r is discharged enters total oil exit pipe to system's fuel feeding, and discharge capacity is in unloading condition for the 5mL/r pump, the pump that be equivalent to a discharge capacity this moment is 30mL/r.
When three electromagnet all are in "on" position (table 1 the 8th row), the fluid of three gear pump discharges all enters total oil exit pipe to system's fuel feeding, the pump that be equivalent to a discharge capacity this moment is 35mL/r.
By this combination, use the gear pump of 3 different displacements, can realize the variation of 8 kinds of discharge capacities with the step pitch of 5mL/r, thereby make the flow of system have level to change.
Claims (5)
1. a multiple gearpump has a grade variable system, it is characterized in that: comprise the gear pump of at least three different displacements, at least three solenoid directional control valves, each gear pump has independent oil drain out, the oil drain out of each gear pump connects the filler opening of solenoid directional control valve, and two hydraulic fluid ports in addition of solenoid directional control valve communicate with total oil drain out with fuel tank respectively.
2. multiple gearpump according to claim 1 has a grade variable system, it is characterized in that: the coaxial connection of all gear pumps, use a prime mover driven.
3. multiple gearpump according to claim 1 has a grade variable system, it is characterized in that: pump delivery is arranged with Geometric Sequence, what gear pumps are arranged, just have how many power kind pump deliveries of two, and be that step pitch makes pump delivery have level to change with the pump delivery of minimum.
4. multiple gearpump according to claim 1 has a grade variable system, it is characterized in that: the fluid that each pump is discharged by the electromagnetism power on/off enters system or flows back to fuel tank, and pump delivery has level to change.
5. multiple gearpump according to claim 1 has a grade variable system, it is characterized in that: by the power on/off of single-chip microcomputer, PLC or computer control solenoid directional control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110107578.3A CN102141040B (en) | 2011-04-28 | Multiple gearpump has a grade variable system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110107578.3A CN102141040B (en) | 2011-04-28 | Multiple gearpump has a grade variable system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102141040A true CN102141040A (en) | 2011-08-03 |
| CN102141040B CN102141040B (en) | 2016-12-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913048A (en) * | 2015-06-12 | 2015-09-16 | 吉林大学 | Logic control based multi-gear-pump serial multi-gear-motor stepped speed changing system |
| CN105064957A (en) * | 2015-08-11 | 2015-11-18 | 吉林大学 | Hydraulic hybrid power driving system of beam-pumping unit and control method of hydraulic hybrid power driving system |
| CN108194439A (en) * | 2017-10-27 | 2018-06-22 | 吉林大学 | Grade variable system and its control method are had based on digital hydraulic pump/motor working in double modes characteristic |
| CN109237105A (en) * | 2018-10-17 | 2019-01-18 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of control valve system that can quickly adjust and its control method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002242904A (en) * | 2001-02-19 | 2002-08-28 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for construction machine |
| CN101255914A (en) * | 2008-03-29 | 2008-09-03 | 牛相平 | Hydraulic transmission variable speed gear |
| CN201526546U (en) * | 2009-11-17 | 2010-07-14 | 华东交通大学 | Hydraulic control system of underground anti-explosion hoister adopting multi-pump combination technique |
| CN201547049U (en) * | 2009-11-23 | 2010-08-11 | 石家庄煤矿机械有限责任公司 | High flow multi-pump multi-valve flow collecting system |
| CN202047982U (en) * | 2011-04-28 | 2011-11-23 | 吉林大学 | Multiple gear pump stepped variable system |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002242904A (en) * | 2001-02-19 | 2002-08-28 | Hitachi Constr Mach Co Ltd | Hydraulic circuit for construction machine |
| CN101255914A (en) * | 2008-03-29 | 2008-09-03 | 牛相平 | Hydraulic transmission variable speed gear |
| CN201526546U (en) * | 2009-11-17 | 2010-07-14 | 华东交通大学 | Hydraulic control system of underground anti-explosion hoister adopting multi-pump combination technique |
| CN201547049U (en) * | 2009-11-23 | 2010-08-11 | 石家庄煤矿机械有限责任公司 | High flow multi-pump multi-valve flow collecting system |
| CN202047982U (en) * | 2011-04-28 | 2011-11-23 | 吉林大学 | Multiple gear pump stepped variable system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913048A (en) * | 2015-06-12 | 2015-09-16 | 吉林大学 | Logic control based multi-gear-pump serial multi-gear-motor stepped speed changing system |
| CN105064957A (en) * | 2015-08-11 | 2015-11-18 | 吉林大学 | Hydraulic hybrid power driving system of beam-pumping unit and control method of hydraulic hybrid power driving system |
| CN108194439A (en) * | 2017-10-27 | 2018-06-22 | 吉林大学 | Grade variable system and its control method are had based on digital hydraulic pump/motor working in double modes characteristic |
| CN108194439B (en) * | 2017-10-27 | 2024-02-23 | 吉林大学 | Stepped variable system based on digital hydraulic pump/motor dual mode operation characteristics and control method thereof |
| CN109237105A (en) * | 2018-10-17 | 2019-01-18 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of control valve system that can quickly adjust and its control method |
| CN109237105B (en) * | 2018-10-17 | 2019-11-26 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of control valve system that can quickly adjust and its control method |
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Granted publication date: 20161214 |