A bidirectional power unit

Abstract

The utility model discloses a bidirectional power unit relates to hydraulic system technical field, including oil tank, oil cylinder and hydraulic pump, the oil tank is used for storage hydraulic oil, the oil cylinder includes cylinder body and piston structure, the piston structure can reciprocate along the axial direction of cylinder body in cylinder body, the piston structure divides the first inner chamber and second inner chamber for the inner chamber of cylinder body, one end of hydraulic pump is passed through first oil circuit subassembly with first inner chamber of oil cylinder intercommunication, the other end of hydraulic pump is passed through second oil circuit subassembly with second inner chamber of oil cylinder intercommunication, the utility model discloses a bidirectional power unit cleverly utilizes the internal pressure of oil liquid to realize energy recovery, reaches the high -efficient energy -conserving target while, effectively reduces the energy loss and system heating problem caused by overflow.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, specifically to a bidirectional power unit. Background Technology

[0002] In the field of equipment and actuator control, bidirectional power units are widely used to control various actions of mechanisms, such as extension and retraction, lifting and lowering. Their basic working principle is to use the forward and reverse rotation of the motor to switch the inlet and outlet directions of the oil circuit, thereby providing power to the actuator in the corresponding direction.

[0003] Currently, there are many types of power units on the market, but their basic principles are roughly the same. They typically consist of components such as a motor, hydraulic pump, relief valve, oil tank, main control valve assembly, and hydraulic lock. Taking a common power unit as an example (see...) Figure 1 and Figure 2 When motor 2 rotates forward, hydraulic pump 3 draws oil from filter 7, the left check valve closes and discharges pressurized oil, which is then supplied to the bottom of cylinder 8, pushing cylinder 8 upward. Conversely, when motor 2 rotates in reverse, the right check valve of hydraulic pump 3 closes and discharges pressurized oil, which is then supplied to the top of cylinder 8, pushing cylinder 8 downward. When the motor stops rotating, hydraulic lock 4 maintains system pressure to prevent cylinder 8 from moving, thus achieving motion control. However, because the bottom cavity of cylinder 8 is larger than the top cavity, if appropriate measures are not taken during the descent of cylinder 8, the entire system may stall, preventing normal operation.

[0004] To address the aforementioned issues, there are generally two main approaches. The first is to add a bypass circuit return valve 9 to achieve the relevant functions through the bypass circuit. This not only affects the system's pressure-holding performance and reduces system safety, but also leads to a decrease in the integration of the power unit and an increase in the required installation space. Furthermore, achieving good pressure-holding performance places extremely high demands on the solenoid valve's pressure-holding capacity, increasing design and manufacturing costs. The second approach is to directly discharge from the relief valve 5. However, in this approach, the relief valve remains continuously open, causing some of the hydraulic oil's kinetic energy to be converted into heat energy, resulting in significant energy loss, which does not conform to the design concept of high efficiency and energy saving. Utility Model Content

[0005] Therefore, in order to overcome the drawbacks of the conventional method of discharging pressurized oil in traditional bidirectional power units, the purpose of this utility model is to provide a bidirectional power unit, the specific technical solution of which is as follows: A bidirectional power unit, comprising: Oil tank, the oil tank being used to store hydraulic oil; A hydraulic cylinder, comprising a cylinder body and a piston structure, wherein the piston structure is capable of reciprocating within the cylinder body along the axial direction of the cylinder body, and the piston structure divides the inner cavity of the cylinder body into a first inner cavity and a second inner cavity; A hydraulic pump, one end of which is connected to the first inner cavity of the cylinder via a first oil circuit assembly, and the other end of which is connected to the second inner cavity of the cylinder via a second oil circuit assembly; When the first oil circuit assembly delivers the hydraulic oil output by the hydraulic pump to the first inner cavity to push the piston structure to move towards the second inner cavity, the hydraulic oil in the second inner cavity is delivered back to the hydraulic pump through the second oil circuit assembly; when the second oil circuit assembly delivers the hydraulic oil output by the hydraulic pump to the second inner cavity to push the piston structure to move towards the first inner cavity, the hydraulic oil in the first inner cavity is delivered back to the hydraulic pump through the first oil circuit assembly.

[0006] In some embodiments, the first oil circuit assembly includes a first pipeline, a hydraulically controlled check valve, and a second pipeline. The first pipeline, the hydraulically controlled check valve, and the second pipeline are connected in sequence. The end of the first pipeline away from the hydraulically controlled check valve is connected to the hydraulic pump, and the end of the second pipeline away from the hydraulically controlled check valve is connected to the first inner cavity.

[0007] In some embodiments, the first oil circuit assembly includes a first control flow channel, one end of which is connected to the first pipeline, and the other end of which is away from the first pipeline is connected to the second oil circuit assembly.

[0008] In some implementations, a first pressure sensor is included, which is connected to the second pipeline for monitoring the oil pressure in the second pipeline.

[0009] In some embodiments, the second oil circuit assembly includes a third pipeline, a balance valve, a one-way throttle valve, and a fourth pipeline, wherein the third pipeline, the balance valve, the one-way throttle valve, and the fourth pipeline are connected in sequence, the end of the third pipeline away from the balance valve is connected to the hydraulic pump, and the end of the fourth pipeline away from the one-way throttle valve is connected to the second inner cavity.

[0010] In some embodiments, the second oil circuit assembly includes a second control flow channel, one end of which is connected to the third pipeline, and the other end of which is away from the third pipeline is connected to the first oil circuit assembly.

[0011] In some implementations, a second pressure sensor is included, which is connected to the fourth pipeline for monitoring the oil pressure in the fourth pipeline.

[0012] In some implementations, a position sensor is included for monitoring changes in the position of the bidirectional power unit.

[0013] In some embodiments, the oil tank is connected to the hydraulic pump via a first check valve and a second check valve, which are respectively located on both sides of the hydraulic pump.

[0014] In some embodiments, filters are provided in the oil lines between the oil tank and the first check valve, and between the oil tank and the second check valve.

[0015] Compared with existing technologies, this utility model's bidirectional power unit has the following advantages: One end of the hydraulic pump is connected to the first inner cavity of the cylinder through a first oil circuit assembly, and the other end is connected to the second inner cavity of the cylinder through a second oil circuit assembly, constructing a complete hydraulic circulation system. This allows the hydraulic pump to deliver hydraulic oil to the two different inner cavities as needed, or to receive hydraulic oil returning from the two inner cavities. By controlling the working state of the hydraulic pump, the flow direction of the hydraulic oil between the first and second oil circuit assemblies can be precisely controlled, thereby precisely controlling the movement direction and speed of the piston structure. The bidirectional oil guiding mechanism constructs a complete and efficient hydraulic circulation system, enabling the hydraulic oil to flow continuously and stably within the system, ensuring the normal operation of the power unit. The first and second oil circuit assemblies are respectively responsible for guiding the hydraulic oil output by the hydraulic pump to the first and second inner cavities of the cylinder, and simultaneously guiding the hydraulic oil in the corresponding inner cavities of the cylinder back to the hydraulic pump. Excess oil can be recovered to the hydraulic pump to drive its operation, achieving energy recovery and resulting in high efficiency and energy saving. The bidirectional power unit of this invention cleverly utilizes the internal pressure of the oil to achieve energy recovery, effectively reducing energy loss caused by overflow and system overheating while achieving the goal of high efficiency and energy saving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the bidirectional power unit described in the prior art; Figure 2 This is a system schematic diagram of a bidirectional power unit as described in the prior art; Figure 3 This is a system schematic diagram of the bidirectional power unit according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the bidirectional power unit according to one embodiment of the present invention.

[0017] Figure label: 1. Oil tank; 2. Motor; 3. Hydraulic pump; 4. Cylinder; 41. Cylinder body; 411. First inner cavity; 412. Second inner cavity; 42. Piston structure; 5. First oil circuit assembly; 51. First pipeline; 52. First control flow channel; 53. Hydraulic control check valve; 54. Second pipeline; 6. Second oil circuit assembly; 61. Third pipeline; 62. Second control flow channel; 63. Balance valve; 64. One-way throttle valve; 641. One-way side; 642. Throttling side; 65. Fourth pipeline; 7. First check valve; 8. Second check valve; 9. Filter screen; 10. Relief valve; 11. First pressure sensor; 12. Second pressure sensor; 13. Position sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with its embodiments. It should be understood that the specific embodiments described herein are only for explaining this utility model and do not limit the scope of protection of this utility model.

[0019] It should be noted that "greater than", "less than", "exceeding", etc. are understood to exclude the number itself, "several" and "more than" mean one or more, and "above", "below", "within" etc. are understood to include the number itself. If the first or second is mentioned, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0020] In this utility model, "first" and "second" do not represent a specific quantity or order, but are merely used to distinguish names.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] The following descriptions of directions are defined as follows: The direction of rotation of motor 2 when it rotates forward is direction A, and the direction of rotation of motor 2 when it rotates backward (i.e., opposite to direction A) is direction B. Specifically, in the following description, the direction of rotation of motor 2 when it rotates forward (direction A) is clockwise as an example.

[0023] Figures 3-4The diagram schematically illustrates a bidirectional power unit according to one embodiment of the present invention, including an oil tank 1, a motor 2, a hydraulic pump 3, a hydraulic cylinder 4, a first oil circuit assembly 5, and a second oil circuit assembly 6. The oil tank 1 and the hydraulic pump 3 are connected via a first check valve 7 and a second check valve 8, which are respectively located on opposite sides of the hydraulic pump 3. In this embodiment, filters 9 are provided in the oil circuits between the oil tank 1 and the first check valve 7, and between the oil tank 1 and the second check valve 8, for filtering and purifying the hydraulic oil entering the hydraulic pump 3 from the oil tank 1. In practical applications, the first check valve 7 and the second check valve 8 can be connected to the oil tank 1 via the same oil circuit with the filter 9, or they can be connected to the oil tank 1 via two separate oil circuits with filters 9. The motor 2 is connected to the hydraulic pump 3; the end of the hydraulic pump 3 near the first check valve 7 is connected to the first oil circuit assembly 5, and the end of the hydraulic pump 3 near the second check valve 8 is connected to the second oil circuit assembly 6. The first hydraulic circuit assembly 5 and the second hydraulic circuit assembly 6, at their ends furthest from the hydraulic pump 3, are respectively connected to the hydraulic cylinder 4 to form a complete hydraulic circuit.

[0024] like Figure 3 As shown, the hydraulic cylinder 4 includes a cylinder body 41 and a piston structure 42. The piston structure 42 abuts against the inside of the cylinder body 41 and can reciprocate linearly along the axis of the cylinder body 41 within the cylinder body 41. A sealing ring (not shown) is installed on the piston structure 42 to ensure the sealing between the piston structure 42 and the cylinder body 41 and prevent hydraulic oil leakage. The piston structure 42 divides the inner cavity of the cylinder body 41 into two relatively independent parts, namely the first inner cavity 411 and the second inner cavity 412. Taking the direction in which the piston structure 42 extends out of the cylinder body 41 as a reference, the inner cavity of the piston structure 42 near the opening end of the cylinder body 41 is called the first inner cavity 411, and the inner cavity of the piston structure 42 near the bottom of the cylinder body 41 is called the second inner cavity 412. Hydraulic oil can enter the first inner cavity 411 or the second inner cavity 412 respectively, thereby driving the piston structure 42 to perform corresponding movements. In this embodiment, the first hydraulic circuit assembly 5 is connected to the first inner cavity 411, and the second hydraulic circuit assembly 6 is connected to the second inner cavity 412.

[0025] like Figure 3As shown, the first hydraulic circuit assembly 5 includes a first pipeline 51, a first control flow channel 52, a hydraulically controlled check valve 53, and a second pipeline 54. One end of the first pipeline 51 is connected to the hydraulic pump 3, and the other end is connected to the hydraulically controlled check valve 53. One end of the first control flow channel 52 is connected to the first pipeline 51, and the other end is connected to the second hydraulic circuit assembly 6. One end of the second pipeline 54 is connected to the hydraulically controlled check valve 53, and the other end is connected to and communicates with the first inner cavity 411. The second hydraulic circuit assembly 6 includes a third pipeline 61, a second control flow channel 62, a balance valve 63, a one-way throttle valve 64, and a fourth pipeline 65. One end of the third pipeline 61 is connected to the hydraulic pump 3, and the other end is connected to the balance valve 63. One end of the second control flow channel 62 is connected to the third pipeline 61, and the other end is connected to the first hydraulic circuit assembly 5. In this embodiment, the end of the first control flow channel 52 furthest from the first pipeline 51 is connected to the balance valve 63, and the end of the second control flow channel 62 furthest from the third pipeline 61 is connected to the hydraulic control check valve 53. The balance valve 63 is connected to the one-way throttle valve 64, which controls the balance of hydraulic oil flow. The one-way throttle valve 64 includes a one-way side 641 and a throttling side 642. The one-way side 641 only allows hydraulic oil to flow in one direction, from the end of the one-way throttle valve 64 connected to the balance valve 63 to the end of the one-way throttle valve 64 connected to the fourth pipeline 65, and automatically closes in the reverse direction. The throttling side 642 is used to adjust the flow rate of hydraulic oil and is used when it is necessary to control the movement speed of the piston structure 42. Hydraulic oil flows in from the end of the one-way throttle valve 64 connected to the balance valve 63, and flows out from the end of the one-way throttle valve 64 connected to the fourth pipeline 65 after passing through the throttling side 642. The flow rate is adjusted by changing the opening of the throttling port. One end of the fourth pipeline 65 is connected to the one-way throttle valve 64, and the other end is connected to and communicates with the second inner cavity 412. In this embodiment, the flow direction of the hydraulic control check valve 53 is as follows: when there is sufficient pressure of hydraulic oil at the control end (i.e., the port connected to the second control flow channel 62), the hydraulic control check valve 53 can open the oil circuit, allowing hydraulic oil to flow from the end connected to the first pipeline 51 to the end connected to the second pipeline 54, realizing reverse flow; when there is no pressure or insufficient pressure at the control end, the hydraulic oil can only flow from the end connected to the second pipeline 54 to the end connected to the first pipeline 51. An overflow valve 10 is also installed on the outlet oil line of the hydraulic pump 3. When the motor 2 rotates forward or reverse, the oil can be recovered to the hydraulic pump 3 to drive the hydraulic pump 3 and realize energy recovery. The remaining oil overflows through the overflow valve 10, reducing energy loss and achieving high efficiency and energy saving. The overflow valve 10 is located at the intersection of the outlet of the hydraulic pump 3 and the return oil line to control the system pressure. When the system pressure exceeds the set value, the overflow valve 10 opens, allowing the remaining oil to flow back to the oil tank 1. In this embodiment, in order to monitor the oil pressure of the second pipeline 54 and the fourth pipeline 65 in real time, the second pipeline 54 is connected to a first pressure sensor 11, and the fourth pipeline 65 is connected to a second pressure sensor 12.

[0026] The bidirectional power unit includes a position sensor 13, which can be installed on the hydraulic check valve 53, the balance valve 63, or the one-way throttle valve 64, depending on actual needs. When the bidirectional power unit in this embodiment is installed on the relevant equipment, the extension or retraction of the piston structure 42 will cause the position of the bidirectional power unit to change. At this time, the position sensor 13 can detect position parameters (such as height and angle) and transmit the data to the control system.

[0027] In this embodiment, during operation of the bidirectional power unit, when motor 2 rotates forward (i.e., rotates in direction A), the first check valve 7 is located near the oil suction side of hydraulic pump 3 when motor 2 rotates forward. At this time, hydraulic pump 3 draws oil from the first check valve 7. Hydraulic oil enters hydraulic pump 3 after being filtered from oil tank 1 through filter screen 9. The hydraulic oil discharged from hydraulic pump 3 enters balance valve 63 through third pipeline 61. During the process of entering balance valve 63, a portion of hydraulic oil will enter and accumulate in second control flow channel 62. The internal hydraulic oil pressure gradually increases with the increase of the inflow. When the pressure generated by the hydraulic oil in second control flow channel 62 is greater than the opening pressure set by hydraulic control check valve 53, the pressure generated by the hydraulic oil can open hydraulic control check valve 53, allowing subsequent hydraulic oil to flow back to hydraulic pump 3 from hydraulic check valve. Subsequently, the hydraulic oil entering the balance valve 63 will enter the one-way side 641 of the one-way throttle valve 64, and finally enter the second inner cavity 412 of the cylinder 4 along the fourth pipeline 65, pushing the piston structure 42 to extend closer to the first inner cavity 411. At this time, the second pressure sensor 12 on the fourth pipeline 65 monitors the inlet oil pressure. At the same time, the oil inside the first inner cavity 411 of the cylinder 4 is discharged and enters the hydraulic control check valve 53 through the second pipeline 54. At this time, the first pressure sensor 11 on the second pipeline 54 monitors the outlet oil pressure. Since the hydraulic oil in the second control flow channel 62 has opened the hydraulic control check valve 53, the hydraulic oil flows back to the hydraulic pump 3 from the hydraulic check valve, thereby driving the hydraulic pump 3 to operate and realizing energy recovery. Excess oil overflows through the overflow valve 10 and then flows back to the oil tank 1. When motor 2 reverses (i.e. rotates in direction B), since the second check valve 8 is located near the oil suction side of hydraulic pump 3 when motor 2 reverses, hydraulic pump 3 draws oil from the second check valve 8. Hydraulic oil enters hydraulic pump 3 from oil tank 1 through filter screen 9. The hydraulic oil discharged by hydraulic pump 3 enters hydraulic check valve through first pipeline 51. A portion of hydraulic oil will enter first control flow channel 52 and accumulate. The internal hydraulic oil pressure increases with the increase of oil volume. When the hydraulic oil in first control flow channel 52 reaches a certain pressure, it can overcome the force inside balance valve 63, causing the valve core to move and thus opening balance valve 63, allowing hydraulic oil to flow back to hydraulic pump 3 from balance valve 63.Subsequently, the hydraulic oil entering the hydraulic check valve will flow along the second pipeline 54 into the first inner cavity 411 of the cylinder 4, causing the piston structure 42 to contract towards the second inner cavity 412. At this time, the first pressure sensor 11 on the second pipeline 54 monitors the inlet oil pressure. Simultaneously, the oil in the second inner cavity 412 of the cylinder 4 will be discharged and enter the throttling side 642 of the one-way throttle valve 64 through the fourth pipeline 65. At this time, the first pressure sensor 11 on the fourth pipeline 65 monitors the outlet oil pressure, and then enters the balance valve 63. It then flows back to the hydraulic pump 3 through the third pipeline 61, thereby driving the hydraulic pump 3 to operate. This realizes the energy recovery when the piston structure 42 retracts, which can provide power to drive the motor and reduce the energy loss of the motor. Excess oil overflows through the overflow valve 10 and then flows back to the oil tank 1.

[0028] The bidirectional power unit in the above embodiment has a reasonable structural design and is easy to use. This structure can also be used for other equipment with similar usage requirements. In the above embodiment, the bidirectional power unit cleverly utilizes the internal pressure of the oil to achieve energy recovery. While achieving the goal of high efficiency and energy saving, it effectively reduces energy loss caused by overflow and system heating problems.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A bidirectional power unit, characterized in that, include: Oil tank, the oil tank being used to store hydraulic oil; A hydraulic cylinder, comprising a cylinder body and a piston structure, wherein the piston structure is capable of reciprocating within the cylinder body along the axial direction of the cylinder body, and the piston structure divides the inner cavity of the cylinder body into a first inner cavity and a second inner cavity; A hydraulic pump, one end of which is connected to the first inner cavity of the cylinder via a first oil circuit assembly, and the other end of which is connected to the second inner cavity of the cylinder via a second oil circuit assembly; When the first oil circuit assembly delivers the hydraulic oil output by the hydraulic pump to the first inner cavity to push the piston structure to move towards the second inner cavity, the hydraulic oil in the second inner cavity is delivered back to the hydraulic pump through the second oil circuit assembly; when the second oil circuit assembly delivers the hydraulic oil output by the hydraulic pump to the second inner cavity to push the piston structure to move towards the first inner cavity, the hydraulic oil in the first inner cavity is delivered back to the hydraulic pump through the first oil circuit assembly.

2. The bidirectional power unit according to claim 1, characterized in that, The first oil circuit assembly includes a first pipeline, a hydraulically controlled check valve, and a second pipeline. The first pipeline, the hydraulically controlled check valve, and the second pipeline are connected in sequence. The end of the first pipeline away from the hydraulically controlled check valve is connected to the hydraulic pump, and the end of the second pipeline away from the hydraulically controlled check valve is connected to the first inner cavity.

3. The bidirectional power unit according to claim 2, characterized in that, The first oil circuit assembly includes a first control flow channel, one end of which is connected to the first pipeline, and the other end of which is away from the first pipeline is connected to the second oil circuit assembly.

4. The bidirectional power unit according to claim 2, characterized in that, It includes a first pressure sensor, which is connected to the second pipeline and is used to monitor the oil pressure in the second pipeline.

5. The bidirectional power unit according to claim 1, characterized in that, The second oil circuit assembly includes a third pipeline, a balance valve, a one-way throttle valve, and a fourth pipeline. The third pipeline, the balance valve, the one-way throttle valve, and the fourth pipeline are connected in sequence. The end of the third pipeline away from the balance valve is connected to the hydraulic pump, and the end of the fourth pipeline away from the one-way throttle valve is connected to the second inner cavity.

6. The bidirectional power unit according to claim 5, characterized in that, The second oil circuit assembly includes a second control flow channel, one end of which is connected to the third pipeline, and the other end of which is away from the third pipeline is connected to the first oil circuit assembly.

7. The bidirectional power unit according to claim 5, characterized in that, It includes a second pressure sensor, which is connected to the fourth pipeline and is used to monitor the oil pressure of the fourth pipeline.

8. The bidirectional power unit according to any one of claims 1-7, characterized in that, It includes a position sensor for monitoring changes in the position of the bidirectional power unit.

9. The bidirectional power unit according to any one of claims 1-7, characterized in that, The oil tank is connected to the hydraulic pump via a first check valve and a second check valve, which are respectively located on both sides of the hydraulic pump.

10. The bidirectional power unit according to claim 9, characterized in that, A filter screen is installed in the oil line between the oil tank and the first check valve, and between the oil tank and the second check valve.

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