CN215719871U - Series gear pump set for high-response electro-hydraulic actuator - Google Patents
Series gear pump set for high-response electro-hydraulic actuator Download PDFInfo
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- CN215719871U CN215719871U CN202122073857.4U CN202122073857U CN215719871U CN 215719871 U CN215719871 U CN 215719871U CN 202122073857 U CN202122073857 U CN 202122073857U CN 215719871 U CN215719871 U CN 215719871U
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Abstract
The utility model discloses a series gear pump set for a high-response electro-hydraulic actuator, which comprises: the main pump is mechanically connected with a plurality of auxiliary pumps in series; the main pump is provided with a first hydraulic pipeline, each auxiliary pump is provided with a second hydraulic pipeline, the first hydraulic pipeline and the second hydraulic pipeline can be used for driving an executing part to act, and the first hydraulic pipeline is connected with each second hydraulic pipeline in parallel. The main pump and the auxiliary pump have different work division, and the extreme working conditions of the system are easily coped with by combining motor control and auxiliary pump electromagnetic valve control; because the auxiliary pump and the electromagnetic valve control of the auxiliary pump are introduced, the requirement on the rotating speed adjusting range of the motor is reduced, when the maximum torque is not changed, the power of the motor can be reduced, the design requirement of the motor is reduced, and the motor has advantages in cost control, weight control and development period.
Description
Technical Field
The utility model relates to the technical field of hydraulic gear pumps, in particular to a series gear pump set for a high-response electro-hydraulic actuator.
Background
In a high-response electro-hydraulic actuator hydraulic system, two extreme working conditions of high pressure, small flow and low pressure, large flow are generally required to be considered, namely an actuating mechanism is required to be capable of outputting large torque (or push-pull force) and rotating at high speed (or moving linearly). The common fixed displacement pump is difficult to meet the requirements, and although the variable displacement pump can meet the flow and pressure requirements of a system to a certain extent, the variable displacement pump is complex in structure, long in development period, high in cost, high in oil liquid requirement, relatively large in volume and weight, and difficult to apply to occasions sensitive to the volume and weight.
At present, the electro-hydraulic actuator generally adopts a quantitative gear pump, the maximum output of the actuator depends on the maximum torque of a motor, the maximum speed of the actuator depends on the flow of the gear pump, and the flow of the gear pump depends on the discharge capacity of the gear pump and the rotating speed of the motor. The pressure and flow regulation range of the gear pump set is limited, when the gear pump set is used in some special occasions, such as the working condition with large output force and the working condition with high speed, and the two working conditions continuously and alternately appear (such as a foot type robot driven by an electro-hydraulic actuator), the constant displacement pump set can hardly meet the requirements unless the performance of the motor is improved, the torque is large, the rotating speed is high, the power of the motor is larger, the performance of the motor is difficult to exert, and the weight is difficult to control, so that the electro-hydraulic actuator adopting the constant displacement pump can hardly be applied to high-response equipment in technical feasibility or economical efficiency.
SUMMERY OF THE UTILITY MODEL
In view of the technical defects, the utility model aims to provide a tandem gear pump set for a high-response electro-hydraulic actuator, which introduces an auxiliary pump and electromagnetic valve control of the auxiliary pump, reduces the requirement on the rotating speed adjusting range of a motor, reduces the power of the motor when the maximum torque is not changed, reduces the design requirement of the motor, and has advantages in cost control, weight control and development period.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a tandem gear pump set for a high-response electro-hydraulic actuator, which comprises: the main pump is mechanically connected with a plurality of auxiliary pumps in series;
the main pump is provided with a first hydraulic pipeline, each auxiliary pump is provided with a second hydraulic pipeline, the first hydraulic pipeline and the second hydraulic pipeline can be used for driving an executing part to act, and the first hydraulic pipeline is connected with each second hydraulic pipeline in parallel.
Preferably, one end of the first hydraulic pipeline is communicated to the inside of the oil tank, the other end of the first hydraulic pipeline is connected with a first electromagnetic valve, the first electromagnetic valve is connected with the hydraulic cylinder, and a through hole in the first electromagnetic valve is communicated with the oil tank;
and a check valve is arranged at a position, between the first electromagnetic valve and the main pump, of the first hydraulic pipeline.
Preferably, one end of the second hydraulic pipeline is communicated to the inside of the oil tank, and the other end of the second hydraulic pipeline is communicated to the first hydraulic pipeline and is positioned between the one-way valve and the first electromagnetic valve;
and a second electromagnetic valve is connected to the second hydraulic pipeline, the second electromagnetic valve is positioned at the outlet of the auxiliary pump, and a through hole on the second electromagnetic valve is communicated with the oil tank.
Preferably, the first solenoid valve is a three-position four-way solenoid valve, and the second solenoid valve is a two-position three-way solenoid valve.
Preferably, the input shaft of the main pump and the input shaft of the auxiliary pump are coaxially connected in series, the input shafts of two adjacent auxiliary pumps are coaxially connected in series, and the main pump is provided with an electric motor.
Preferably, the hydraulic control system further comprises a third hydraulic pipeline connected with the first hydraulic pipeline in parallel, an overflow valve is arranged on the third hydraulic pipeline, one end of the third hydraulic pipeline is communicated to the inside of an oil tank, and the other end of the third hydraulic pipeline is communicated to the first hydraulic pipeline and is located between the check valve and the first electromagnetic valve.
Preferably, the actuator is a double acting hydraulic cylinder.
The utility model has the beneficial effects that:
(1) different combinations of the main pump and the auxiliary pumps have wider flow regulation capacity, and the maximum pressure of the main pump also determines the maximum pressure of the system.
(2) The main pump and the auxiliary pump are different in division of work, and are combined with the control of the electromagnetic valve of the auxiliary pump through the motor control, so that the extreme working conditions of the system can be easily dealt with.
(3) Because the auxiliary pump and the electromagnetic valve control of the auxiliary pump are introduced, the requirement on the rotating speed adjusting range of the motor is reduced, when the maximum torque is not changed, the power of the motor can be reduced, the design requirement of the motor is reduced, and the motor has advantages in cost control, weight control and development period.
(4) The gear pump has the advantages of simple structure, reliable operation, low requirement on oil, low maintenance cost and competitive advantage compared with a variable pump.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a tandem gear pump unit for a high-response electro-hydraulic actuator according to an embodiment of the utility model.
Fig. 2 is a schematic diagram of a mechanical series structure of the pumps in the present embodiment.
Fig. 3 is a schematic diagram of a pump in the prior art.
Description of reference numerals:
1-motor, 2-main pump, 3-auxiliary pump, 4-first electromagnetic valve, 5-one-way valve, 6-second electromagnetic valve, 7-executive component, 8-overflow valve and 9-oil tank;
01-front end cover, 02-pump body, 03-rear end cover, 04-driving tooth, 05-driven tooth, 06-input shaft, 07-short shaft and 08-flat key.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1, the present invention provides a tandem gear pump set for a high-response electro-hydraulic actuator, which includes a main pump 2 and a plurality of auxiliary pumps 3, wherein the main pump 2 is mechanically connected in series with the auxiliary pumps 3, and two adjacent auxiliary pumps 3 are mechanically connected in series, wherein the main pump 2 and the auxiliary pumps 3 are both pumps in the prior art, as shown in fig. 3, the tandem gear pump set includes a front end cover 01, a pump body 02, a rear end cover 03, a driving gear 04, a driven gear 05, an input shaft 06, a short shaft 07, a flat key 08, and the like, and will not be described in detail herein, the mechanical tandem in this embodiment means that the input shafts 06 of the pumps are connected in series and rotate synchronously, that is, as shown in fig. 2, the input shafts 06 of the adjacent pumps are mutually matched (connected by splines) to form a tandem, and the power input of the main pump 2 is realized by a motor 1 connected thereto; it should be noted that fig. 2 and 3 show only one pump configuration of the prior art, and that there are other pump configurations that are mechanically in series, i.e., the input shafts of the pumps rotate in unison.
With reference to fig. 1, a first hydraulic pipeline is disposed on the main pump 2, a second hydraulic pipeline is disposed on each secondary pump 3, the first hydraulic pipeline and the second hydraulic pipeline can be used for driving the actuating element 7 to move, the actuating element 7 in this embodiment is a double-acting hydraulic cylinder, and the first hydraulic pipeline is connected in parallel with each second hydraulic pipeline, i.e., a mechanical series connection between pump bodies and a parallel connection between pump body hydraulic pipelines are formed.
Referring to fig. 1, one end of a first hydraulic pipeline is communicated to an oil tank 9, the other end of the first hydraulic pipeline is connected with a first electromagnetic valve 4, the first electromagnetic valve 4 is a three-position four-way electromagnetic valve, a hydraulic cylinder is connected to the first electromagnetic valve 4, and a through hole in the first electromagnetic valve 4 is communicated with the oil tank 9; a check valve 5 is arranged at a position of the first hydraulic pipeline between the first electromagnetic valve 4 and the main pump 2, namely the check valve 5 is arranged at an outlet of the main pump 2 to prevent backflow;
one end of the second hydraulic pipeline is communicated to the oil tank 9, and the other end of the second hydraulic pipeline is communicated to the first hydraulic pipeline and is positioned between the one-way valve 5 and the first electromagnetic valve 4;
and a second electromagnetic valve 6 is connected to the second hydraulic pipeline, the second electromagnetic valve 6 is a two-position three-way electromagnetic valve, the second electromagnetic valve 6 is positioned at the outlet of the auxiliary pump 3, and a through hole on the second electromagnetic valve 6 is communicated with an oil tank 9.
Further, with reference to fig. 1, a third hydraulic pipeline connected in parallel with the first hydraulic pipeline is further provided, an overflow valve 8 is provided on the third hydraulic pipeline, one end of the third hydraulic pipeline is communicated to an oil tank 9, and the other end of the third hydraulic pipeline is communicated to the first hydraulic pipeline and is located between the check valve 5 and the first electromagnetic valve 4.
When the hydraulic oil way switching device is used, the main pump 2 is always in a working state, when the flow of the main pump 2 is insufficient, the oil way is switched to the main oil way by the second electromagnetic valve 6 on the second hydraulic pipeline connected with the auxiliary pump 3, and the auxiliary pump 3 and the main pump 2 work simultaneously; when the auxiliary pump 3 is not needed to work, the oil duct is switched to the oil return duct by the second electromagnetic valve 6 on the second hydraulic pipeline connected with the auxiliary pump 3, and at the moment, the auxiliary pump 2 pumps the hydraulic oil back into the oil tank 9. The actuating member of the present application includes not only various hydraulic cylinders, but also actuators such as hydraulic motors; in addition, each auxiliary pump 3 is provided with a two-position three-way electromagnetic valve for controlling an oil path of the auxiliary pump 3, the flow and the pressure of a system can be effectively controlled in a wider range through different combinations of the main pump 2 and the auxiliary pump 3, the design requirement of the motor is reduced, the motor has advantages in cost control, weight control and development period, and in addition, when the motor 1 adopts a permanent magnet motor, the weak magnetic ratio of the permanent magnet motor can be reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A tandem gear pump assembly for a high-response electro-hydraulic actuator, comprising: the main pump is mechanically connected with a plurality of auxiliary pumps in series;
the main pump is provided with a first hydraulic pipeline, each auxiliary pump is provided with a second hydraulic pipeline, the first hydraulic pipeline and the second hydraulic pipeline can be used for driving an executing part to act, and the first hydraulic pipeline is connected with each second hydraulic pipeline in parallel.
2. The tandem gear pump set for the high-response electro-hydraulic actuator as claimed in claim 1, wherein one end of the first hydraulic pipeline is communicated to an oil tank, the other end of the first hydraulic pipeline is connected with a first electromagnetic valve, the hydraulic cylinder is connected to the first electromagnetic valve, and a port of the first electromagnetic valve is communicated with the oil tank;
and a check valve is arranged at a position, between the first electromagnetic valve and the main pump, of the first hydraulic pipeline.
3. The tandem gear pump group for the high-response electro-hydraulic actuator as claimed in claim 2, wherein one end of the second hydraulic pipeline is communicated to an oil tank, and the other end of the second hydraulic pipeline is communicated to the first hydraulic pipeline and is positioned between the one-way valve and the first electromagnetic valve;
and a second electromagnetic valve is connected to the second hydraulic pipeline, the second electromagnetic valve is positioned at the outlet of the auxiliary pump, and a through hole on the second electromagnetic valve is communicated with the oil tank.
4. The tandem gear pump group for the high-response electro-hydraulic actuator as claimed in claim 3, wherein the first solenoid valve is a three-position four-way solenoid valve, and the second solenoid valve is a two-position three-way solenoid valve.
5. The tandem gear pump group for the high-response electro-hydraulic actuator as claimed in any one of claims 1 to 4, wherein the input shaft of the main pump and the input shaft of the auxiliary pump are coaxially connected in series, the input shafts of two adjacent auxiliary pumps are coaxially connected in series, and the main pump is provided with an electric motor.
6. The tandem gear pump set for the high-response electro-hydraulic actuator as claimed in claim 5, further comprising a third hydraulic pipeline connected with the first hydraulic pipeline in parallel, wherein an overflow valve is arranged on the third hydraulic pipeline, one end of the third hydraulic pipeline is communicated to an oil tank, and the other end of the third hydraulic pipeline is communicated to the first hydraulic pipeline and is positioned between the check valve and the first electromagnetic valve.
7. The tandem gear pump assembly for a high-response electro-hydraulic actuator as claimed in claim 5, wherein the actuator is a double-acting hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122073857.4U CN215719871U (en) | 2021-08-30 | 2021-08-30 | Series gear pump set for high-response electro-hydraulic actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122073857.4U CN215719871U (en) | 2021-08-30 | 2021-08-30 | Series gear pump set for high-response electro-hydraulic actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215719871U true CN215719871U (en) | 2022-02-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122073857.4U Active CN215719871U (en) | 2021-08-30 | 2021-08-30 | Series gear pump set for high-response electro-hydraulic actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215719871U (en) |
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2021
- 2021-08-30 CN CN202122073857.4U patent/CN215719871U/en active Active
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