CN216554656U - Hydraulic system and engineering machinery - Google Patents
Hydraulic system and engineering machinery Download PDFInfo
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- CN216554656U CN216554656U CN202122677194.7U CN202122677194U CN216554656U CN 216554656 U CN216554656 U CN 216554656U CN 202122677194 U CN202122677194 U CN 202122677194U CN 216554656 U CN216554656 U CN 216554656U
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Abstract
The utility model relates to the technical field of engineering machinery, in particular to a hydraulic system and engineering machinery. The hydraulic system comprises a pump, a first branch, a second branch, a hydraulic driver, an accumulator and a proportional pressure reducing valve; two ends of the first branch are respectively connected with a first port of the pump and a second port of the hydraulic driver, and two ends of the second branch are respectively connected with a third port of the pump and a fourth port of the hydraulic driver; the inlet of the proportional pressure reducing valve is connected with the outlet of the energy accumulator respectively, and the outlet of the proportional pressure reducing valve is connected with the first branch and the second branch respectively. The accumulator may energize the first branch and/or the second branch when the pressure in the first branch or the second branch is not sufficiently supplied; the energy is respectively supplied to the upstream and the downstream in the same loop through one energy accumulator, the energy supply efficiency is improved, the waste caused by the fact that the energy accumulators are simultaneously arranged on the first branch and the second branch can be avoided, and the cost is saved more.
Description
Technical Field
The utility model relates to the technical field of engineering machinery, in particular to a hydraulic system and engineering machinery.
Background
The energy accumulator is used as an energy storage device, can convert the energy in the hydraulic system into compression energy or potential energy to be stored at a proper time, and converts the compression energy or the potential energy into hydraulic pressure or air pressure and other energy to be released when the hydraulic system needs the energy accumulator, and the energy accumulator supplies the energy to the hydraulic system again. However, energy accumulators are generally used for energy supply for different branches, for example, in a closed circuit, the energy accumulators are arranged upstream and downstream of the hydraulic actuator respectively for energy supply, which results in waste of the energy accumulators and higher cost.
SUMMERY OF THE UTILITY MODEL
The utility model solves the problem that energy accumulators are respectively adopted by different branches for energy supply, so that the energy accumulators are wasted.
In order to solve the above problems, the present invention provides a hydraulic system, which includes a pump, a first branch, a second branch, a hydraulic driver, an accumulator and a proportional pressure reducing valve; two ends of the first branch circuit are respectively connected with a first port of the pump and a second port of the hydraulic driver, and two ends of the second branch circuit are respectively connected with a third port of the pump and a fourth port of the hydraulic driver; an inlet of the proportional pressure reducing valve is connected with an outlet of the energy accumulator respectively, and an outlet of the proportional pressure reducing valve is connected with the first branch and the second branch respectively; the first and third ports are inlets, and the second and fourth ports are outlets; or, the first port and the third port are outlets, and the second port and the fourth port are inlets.
Optionally, the hydraulic system further comprises a solenoid valve having a first outlet, a second outlet, and a solenoid valve inlet; the first outlet is connected with the first branch, the second outlet is connected with the second branch, and the inlet of the electromagnetic valve is connected with the outlet of the proportional pressure reducing valve; the electromagnetic valve inlet is suitable for being closed when the energy accumulator accumulates energy; the solenoid valve inlet is adapted to communicate with the first and second outlets when the accumulator is discharged.
Optionally, the hydraulic system further comprises a first check valve and a second check valve; an inlet of the first one-way valve is connected with the first branch, and an outlet of the first one-way valve is connected with the energy accumulator; and the inlet of the second one-way valve is connected with the second branch, and the outlet of the second one-way valve is connected with the accumulator.
Optionally, the hydraulic system further comprises a first pressure detecting element and a second pressure detecting element; the first pressure detection element is connected with the first branch and is suitable for detecting the first pressure of the first branch; the second pressure detecting element is connected with the second branch, and the second pressure detecting element is suitable for detecting the second pressure of the second branch.
Optionally, when the accumulator is discharged, the proportional pressure reducing valve opens to a set opening degree such that an outlet pressure of the proportional pressure reducing valve is between the first pressure and the second pressure.
Optionally, the hydraulic system further includes a rotation speed sensor, the hydraulic driver is a hydraulic motor, the rotation speed sensor is adapted to acquire a rotation speed of the hydraulic motor, the proportional pressure reducing valve is adapted to be opened when the rotation speed of the hydraulic motor is greater than or equal to a set rotation speed, and the proportional pressure reducing valve is adapted to be closed when the rotation speed of the hydraulic motor is less than the set rotation speed.
Optionally, the hydraulic system further includes a third check valve, an inlet of the third check valve is connected to an outlet of the proportional pressure reducing valve, and an outlet of the third check valve is connected to the first branch and the second branch, respectively.
Optionally, the hydraulic system further comprises a flushing valve, which is connected with the first branch and the second branch, respectively.
Optionally, the hydraulic system further includes an oil supply pump, a fourth check valve and a fifth check valve, the oil supply pump is connected to the inlets of the fourth check valve and the fifth check valve, the outlet of the fourth check valve is connected to the first branch, and the outlet of the fifth check valve is connected to the second branch.
Compared with the prior art, the hydraulic system has the beneficial effects that:
according to the utility model, the energy accumulator is respectively connected with the first branch and the second branch, and when the pressure supply in the first branch or the second branch is insufficient, the energy accumulator can supply energy to the first branch and the second branch by controlling the proportional pressure reducing valve to be opened to a set opening degree. Through one the energy storage ware is to being in the upper reaches and the low reaches of same return circuit respectively the energy supply, improves energy supply efficiency, also can avoid respectively first branch road with the second branch road sets up the waste that the energy storage ware caused simultaneously, saves the cost more. The pressure of the hydraulic oil released by the energy accumulator can be adjusted through the proportional pressure reducing valve, and the utilization rate of energy is improved.
The utility model also provides engineering machinery comprising the hydraulic system. The beneficial effects of the engineering machinery and the hydraulic system are the same, and are not described herein again.
Drawings
FIG. 1 is a schematic diagram of a hydraulic system in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydraulic system in another embodiment of the present invention;
FIG. 3 is a port schematic of a solenoid valve in an embodiment of the utility model.
Description of reference numerals:
1-transfer case, 2-pump, 3-first branch, 4-second branch, 5-hydraulic driver, 6-third branch, 7-fourth branch, 8-first check valve, 9-second check valve, 10-accumulator, 11-one-way throttle valve, 12-proportional pressure reducing valve, 13-third check valve, 14-electromagnetic valve, 15-second pressure detecting element, 16-first pressure detecting element, 17-rotation speed sensor, 18-control device, 19-rear axle, 20-oil supplementing pump, 21-flushing valve, 22-fourth check valve and 23-fifth check valve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the two or more media may be directly connected or indirectly connected through an intermediate medium, or may be directly or indirectly connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the terms "an embodiment," "one embodiment," and "one implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or example implementation of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.
An embodiment of the present invention provides a hydraulic system, as shown in fig. 1 and 2, including a pump 2, a first branch 3, a second branch 4, a hydraulic driver 5, an accumulator 10, and a proportional pressure reducing valve 12; two ends of the first branch 3 are respectively connected with a first port of the pump 2 and a second port of the hydraulic driver 5, and two ends of the second branch 4 are respectively connected with a third port of the pump 2 and a fourth port of the hydraulic driver 5; the inlets of the proportional pressure reducing valves 12 are respectively connected with the accumulator 10, and the outlets of the proportional pressure reducing valves 12 are respectively connected with the first branch 3 and the second branch 4.
Here, the hydraulic actuator may be a hydraulic motor, for example, a drive motor of the rear axle 19 of the vehicle, and the hydraulic actuator may be a pump, a cylinder, or the like. The pump 2 is connected to the transfer case 1, and the pump 2 can also be connected to other drive mechanisms. The first branch 3 and the second branch 4 refer to a single-stage pipeline, and may be a structure in which multiple stages of pipelines are connected in series. When the second port of the hydraulic driver 5 is the outlet of the hydraulic driver 5, the first port of the pump 2 is the inlet of the pump 2, the third port of the pump 2 is the outlet of the pump 2, and the fourth port of the hydraulic driver 5 is the inlet of the hydraulic driver 5; when the second port of the hydraulic actuator 5 is the inlet of the hydraulic actuator 5, the first port of the pump 2 is the outlet of the pump 2, the third port of the pump 2 is the inlet of the pump 2, and the fourth port of the hydraulic actuator 5 is the outlet of the hydraulic actuator 5. The first branch 3 and the second branch 4 form a closed circuit. Here, the energy storage of the energy storage device 10 is not limited, and the energy storage device 10 may be stored by the first branch line 3 or the second branch line 4, or the energy storage device 10 may be stored by an external branch line.
Thus, by connecting the accumulator 10 to the first branch 3 and the second branch 4, respectively, when the pressure supply in the first branch 3 or the second branch 4 is insufficient, the accumulator 10 can supply energy to the first branch 3 and the second branch 4 by controlling the proportional pressure reducing valve 12 to open to a set opening degree. Through one energy storage ware 10 is to being in the upper reaches and the low reaches of same return circuit respectively the energy supply, improves energy supply efficiency, also can avoid respectively first branch road 3 with the waste that second branch road 4 set up the energy storage ware simultaneously and cause, save the cost more. The pressure of the hydraulic oil released by the accumulator 10 can be adjusted through the proportional pressure reducing valve 12, and the utilization rate of energy is improved.
As shown in fig. 1 and 3, the hydraulic system further includes a solenoid valve 14, the solenoid valve 14 having a first outlet a, a second outlet B, and a solenoid valve inlet C; the first outlet A is connected with the first branch 3, the second outlet B is connected with the second branch 4, and the electromagnetic valve inlet C is connected with an outlet of the proportional pressure reducing valve 12; the solenoid valve inlet C is adapted to close when the accumulator 10 is charged; the solenoid valve inlet C is adapted to communicate with the first outlet a and the second outlet B when the accumulator 10 is discharged.
The type of the solenoid valve 14 is not limited herein, and the solenoid valve 14 may be a two-position three-way solenoid valve, or two-position two-way solenoid valves, etc. When the accumulator 10 is discharged, that is, when the accumulator 10 releases energy, the solenoid valve inlet C is respectively communicated with the first outlet a and the second outlet B through an internal channel of the solenoid valve 14, and supplies liquid to the first branch 3 through the first outlet a and supplies liquid to the second branch 4 through the second outlet B. When the energy storage device 10 is completely discharged or stores energy, the electromagnetic valve 14 is reversed, so that the electromagnetic valve inlet C is closed, the electromagnetic valve inlet C, the first outlet a and the second outlet B are in a disconnected state, and the safety performance of the system is better.
As shown in fig. 1 and 2, the hydraulic system further includes a first check valve 8 and a second check valve 9; the inlet of the first check valve 8 is connected with the first branch 3, and the outlet of the first check valve 8 is connected with the accumulator 10; the inlet of the second check valve 9 is connected with the second branch 4, and the outlet of the second check valve 9 is connected with the accumulator 10.
It should be noted that the hydraulic system further includes a third branch 6 and a fourth branch 7; a first end of the third branch 6 is connected with the first branch 3, a second end of the third branch 6 is connected with an inlet of the accumulator 10, the first check valve 8 is arranged in the third branch 6, and the check valve 8 is suitable for communicating the first branch 3 with the accumulator 10; a first end of the fourth branch 7 is connected to the second branch 4, a second end of the fourth branch 7 is connected to an inlet of the accumulator 10, the second check valve 9 is disposed in the fourth branch 7, and the check valve 8 is adapted to communicate the second branch 4 to the accumulator 10.
Therefore, through the arrangement of the first check valve 8 and the second check valve 9, backflow of liquid in the energy storage device 10 during energy storage can be avoided, through the connection of the first check valve 8 and the first branch 3 and the connection of the second check valve 9 and the second branch 4, the energy storage device 10 can be simultaneously stored through the first branch 3 and the second branch 4, and the energy storage efficiency is improved.
When the hydraulic actuator 5 is pulled back at high speed, it causes a sharp change in the pressure in the first branch 3 and the second branch 4. As shown in fig. 1 and 2, the hydraulic system further includes a first pressure detecting element 16 and a second pressure detecting element 15; the first pressure detecting element 16 is connected to the first branch 3, and the first pressure detecting element 16 is adapted to detect a first pressure of the first branch 3; the second pressure detecting element 15 is connected to the second branch 4, and the second pressure detecting element 15 is adapted to detect the second pressure of the second branch 4. Here, the first pressure detecting element 16 and the second pressure detecting element 15 may be a pressure sensor, a pressure gauge, or other pressure detecting means. The first pressure detecting element 16 and the second pressure detecting element 15 can respectively monitor the pressure of the first branch 3 and the second branch 4, so as to determine whether the phenomenon of oil shortage or oil shortage occurs in the first branch 3 or the second branch 4.
The hydraulic system may comprise a control device 18, said control device 18 being in communication with said first pressure detecting element 16 and said second pressure detecting element 15, respectively, said control device 18 being adapted to obtain said first pressure and said second pressure, respectively. The control device 18 may be an industrial personal computer, a computer host or other control terminal.
When the hydraulic driver 5 is dragged backwards at a high speed, the pressure of a closed system changes along with the change of the rotating speed of the hydraulic driver 5, but the pressure cannot be matched well when the proportional pressure reducing valve 12 is used for outputting constant pressure, so that the effective volume of the accumulator 10 is wasted, and even the pressure at the outlet of the proportional pressure reducing valve 12 is lower than the pressure of the first branch circuit 3 or the second branch circuit 4, so that the protection failure is caused. As shown in fig. 1 and 2, when the accumulator 10 is discharged, the proportional pressure reducing valve 12 is opened to a first set opening degree such that the outlet pressure of the proportional pressure reducing valve 12 is between the first pressure and the second pressure. The control device 18 may also be in communication connection with the proportional pressure reducing valve 12, and the opening degree of the proportional pressure reducing valve 12 is adjusted by the control device 18, where the first set opening degree is determined according to actual conditions, and the first set opening degree may be an interval, and when the opening degree of the proportional pressure reducing valve 12 is opened to the set opening degree, the outlet pressure of the proportional pressure reducing valve 12 is greater than the smaller value of the first pressure and the second pressure, and is less than the larger value of the first pressure and the second pressure. Thus, the energy accumulator 10 can only supply energy to the first branch 3 or the second branch 4, the energy utilization efficiency of the energy accumulator 10 can be improved, and the problem that the energy accumulator 10 fails to protect when the hydraulic driver 5 is reversely dragged at a high speed can be avoided.
Alternatively, when the accumulator 10 is discharged, the proportional pressure reducing valve 12 is opened to a second set opening degree such that the outlet pressure of the proportional pressure reducing valve 12 is greater than the larger of the first pressure and the second pressure. Here, the second set opening degree is determined according to actual conditions, and the second set opening degree may be a section in which the outlet pressure of the proportional pressure reducing valve 12 is greater than the first pressure and the second pressure when the opening degree of the proportional pressure reducing valve 12 is opened to the second set opening degree, so that the first branch passage 3 and the second branch passage 4 may be simultaneously supplied with power.
As shown in fig. 1 and 2, the hydraulic system further includes a rotation speed sensor 17, the hydraulic driver 5 is a hydraulic motor, the rotation speed sensor 17 is adapted to acquire a rotation speed of the hydraulic motor, the proportional pressure reducing valve 12 is adapted to be opened when the rotation speed of the hydraulic motor is greater than or equal to a set rotation speed, and the proportional pressure reducing valve 12 is adapted to be closed when the rotation speed of the hydraulic motor is less than the set rotation speed. Here, the rotational speed sensor 17 is connected in communication with the control device 18, and when the rotational speed of the hydraulic motor reaches a set rotational speed, the hydraulic system may be back-towed, and the energy accumulator 10 is opened to supply energy to the first branch 3 or the second branch 4. The rotation speed of the hydraulic motor is monitored, so that whether the hydraulic system is reversely dragged or not is indirectly monitored.
As shown in fig. 1 and 2, the hydraulic system further includes a third check valve 13, an inlet of the third check valve 13 is connected to an outlet of the proportional pressure reducing valve 12, and an outlet of the third check valve 13 is connected to the first branch passage 3 and the second branch passage 4, respectively. That is, the third check valve 13 is provided in the branch to which the accumulator 10 is discharged, so that it is possible to prevent the pressure of the first branch 3 or the second branch 4 from flowing back when the accumulator 10 is discharged.
As shown in fig. 1 and 2, the hydraulic system further includes an oil supply pump 20, a fourth check valve 22, and a fifth check valve 23, where the oil supply pump 20 is connected to inlets of the fourth check valve 22 and the fifth check valve 23, an outlet of the fourth check valve 22 is connected to the first branch 3, and an outlet of the fifth check valve 23 is connected to the second branch 4. When the first branch 3 or the second branch 4 leaks or loses, the oil can be supplemented to the first branch 3 or the second branch 4 through the oil supplementing pump 20, so that the normal oil pressure of the first branch 3 or the second branch is ensured.
As shown in fig. 1 and 2, the hydraulic system further comprises a flush valve 21, said flush valve 21 being connected to said first branch 3 and said second branch 4, respectively. The flushing valve 21 may be a device with a flushing valve, and when the oil pressure in the first branch 3 or the second branch 4 is too high, or the oil supply pump 20 supplies too much oil, the surplus oil may overflow from the flushing valve 21.
As shown in fig. 1 and 2, the hydraulic system further includes a one-way throttle valve 11, the first branch 3 and the second branch 4 are respectively connected to an inlet of the one-way throttle valve 11, and an outlet of the one-way throttle valve 11 is connected to the accumulator 10. By the arrangement of the one-way throttle valve 11, the pressure oil can be collected slowly, and the normal operation of the engineering machinery is not influenced.
Another embodiment of the present invention provides a working machine, including the above hydraulic system. The beneficial effects of the engineering machinery and the hydraulic system are the same, and are not described in detail herein.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A hydraulic system is characterized by comprising a pump (2), a first branch (3), a second branch (4), a hydraulic driver (5), an energy accumulator (10) and a proportional pressure reducing valve (12); the two ends of the first branch (3) are suitable for being connected with a first port of the pump (2) and a second port of the hydraulic driver (5) respectively, and the two ends of the second branch (4) are suitable for being connected with a third port of the pump (2) and a fourth port of the hydraulic driver (5) respectively; the inlet of the proportional pressure reducing valve (12) is connected with the outlet of the energy accumulator (10), and the outlet of the proportional pressure reducing valve (12) is connected with the first branch (3) and the second branch (4) respectively; the first and third ports are inlets, and the second and fourth ports are outlets; or, the first port and the third port are outlets, and the second port and the fourth port are inlets.
2. The hydraulic system of claim 1, further comprising a solenoid valve (14), the solenoid valve (14) having a first outlet (a), a second outlet (B), and a solenoid valve inlet (C); the first outlet (A) is connected with the first branch (3), the second outlet (B) is connected with the second branch (4), and the electromagnetic valve inlet (C) is connected with an outlet of the proportional pressure reducing valve (12); the solenoid valve inlet (C) is adapted to be closed when the accumulator (10) is charged; the solenoid valve inlet (C) is adapted to communicate with the first outlet (A) and the second outlet (B) when the accumulator (10) is discharged.
3. The hydraulic system according to claim 1, further comprising a first check valve (8) and a second check valve (9); the inlet of the first one-way valve (8) is connected with the first branch (3), and the outlet of the first one-way valve (8) is connected with the accumulator (10); the inlet of the second one-way valve (9) is connected with the second branch (4), and the outlet of the second one-way valve (9) is connected with the energy accumulator (10).
4. A hydraulic system according to any one of claims 1-3, characterized by further comprising a first pressure sensing element (16) and a second pressure sensing element (15); said first pressure detection element (16) being connected to said first branch (3), said first pressure detection element (16) being adapted to detect a first pressure of said first branch (3); the second pressure detecting element (15) is connected to the second branch (4), the second pressure detecting element (15) being adapted to detect a second pressure of the second branch (4).
5. A hydraulic system according to claim 4, characterized in that the proportional pressure reducing valve (12) opens to a first set opening when the accumulator (10) is discharged so that the outlet pressure of the proportional pressure reducing valve (12) is between the first and second pressure; or when the accumulator (10) is discharged, the proportional pressure reducing valve (12) is opened to a second set opening degree so that the outlet pressure of the proportional pressure reducing valve (12) is greater than the larger value of the first pressure and the second pressure.
6. The hydraulic system according to claim 5, characterized in that it further comprises a rotation speed sensor (17), the hydraulic drive (5) is a hydraulic motor, the rotation speed sensor (17) is adapted to pick up the rotation speed of the hydraulic motor, the proportional pressure reducing valve (12) is adapted to open when the rotation speed of the hydraulic motor is greater than or equal to a set rotation speed, the proportional pressure reducing valve (12) is adapted to close when the rotation speed of the hydraulic motor is less than the set rotation speed.
7. A hydraulic system according to any one of claims 1-3, further comprising a third non return valve (13), an inlet of the third non return valve (13) being connected to an outlet of the proportional pressure reducing valve (12), an outlet of the third non return valve (13) being connected to the first branch (3) and the second branch (4), respectively.
8. A hydraulic system according to any one of claims 1-3, further comprising a flushing valve (21), said flushing valve (21) being connected to said first branch (3) and said second branch (4), respectively.
9. A hydraulic system according to any one of claims 1-3, characterized in that it further comprises an oil replenishment pump (20), a fourth non-return valve (22) and a fifth non-return valve (23), the oil replenishment pump (20) being connected to the inlets of the fourth non-return valve (22) and the fifth non-return valve (23), respectively, the outlet of the fourth non-return valve (22) being connected to the first branch (3) and the outlet of the fifth non-return valve (23) being connected to the second branch (4).
10. A working machine, characterized in that it comprises a hydraulic system according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677194.7U CN216554656U (en) | 2021-11-03 | 2021-11-03 | Hydraulic system and engineering machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122677194.7U CN216554656U (en) | 2021-11-03 | 2021-11-03 | Hydraulic system and engineering machinery |
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| Publication Number | Publication Date |
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| CN216554656U true CN216554656U (en) | 2022-05-17 |
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| CN202122677194.7U Active CN216554656U (en) | 2021-11-03 | 2021-11-03 | Hydraulic system and engineering machinery |
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| CN (1) | CN216554656U (en) |
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2021
- 2021-11-03 CN CN202122677194.7U patent/CN216554656U/en active Active
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