Energy-saving hydraulic system

Abstract

An energy-saving hydraulic system includes a power pump, a hydraulic actuator, a control valve, a proportional solenoid valve, a main pipeline, and an overflow unit. The main pipeline includes a first overflow section and a second overflow section. The overflow unit includes a safety valve, a first shunt channel connected between the first overflow section and the safety valve, and a second shunt channel connected between the second overflow section and the safety valve. When the pressure difference between the first overflow section and the second overflow section reaches a pressure difference threshold, the safety valve will be triggered and conducted, allowing the working fluid to be discharged. In the present invention, through the second shunt channel, the safety valve can also be triggered when the opening of the proportional solenoid valve becomes smaller, reducing the load on the power pump, thereby achieving an energy-saving effect.

Description

Technical Field

[0001] The present invention relates to an actuating assembly, and more particularly to an energy-saving hydraulic system. Background Art

[0002] Referring to Figure 1 , an existing hydraulic system includes a power pump 91, a hydraulic cylinder 92, a control valve 93 disposed between the power pump 91 and the hydraulic cylinder 92 for controlling the actuation of the hydraulic cylinder 92, a proportional solenoid valve 94 disposed between the power pump 91 and the control valve 93 for regulating the flow rate, a safety valve 95 disposed between the power pump 91 and the proportional solenoid valve 94, and a pipeline 96 communicating with the power pump 91, the hydraulic cylinder 92, the control valve 93, the proportional solenoid valve 94, and the safety valve 95. The working fluid will flow along the pipeline 96 in sequence from the power pump 91 through the safety valve 95, the proportional solenoid valve 94 and the control valve 93 and reach the hydraulic cylinder 92. By controlling the control valve 93, the operator can control the actuation of the hydraulic cylinder 92 and interlock other mechanical structures to achieve the actuation function. By controlling the proportional solenoid valve 94, the operator can further control the flow rate flowing into the hydraulic cylinder 92, and thus control the speed and force when the hydraulic cylinder 92 is actuated. When the pressure in the pipeline 96 is too high and reaches an overflow threshold, the safety valve 95 will be triggered and conducted, so that the working fluid is discharged from the safety valve 95 to prevent the power pump 91 or the hydraulic cylinder 92 from being damaged due to overloading.

[0003] However, during the process of controlling the proportional solenoid valve 94, if the opening degree of the proportional solenoid valve 94 becomes smaller, the flow rate passing through the proportional solenoid valve 94 also becomes smaller. This will cause the pressure at the upstream of the proportional solenoid valve 94 to rise correspondingly. However, the increased pressure may not necessarily exceed the overflow threshold, so the safety valve 95 may not be triggered immediately. It is necessary to wait until the pressure rises to the overflow threshold before the safety valve 95 will be triggered. In this case, the power pump 91 still bears a high load. Although it will not be damaged, it consumes a lot of energy. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy-saving hydraulic system that reduces load and saves energy.

[0005] The energy-saving hydraulic system of the present invention includes a power pump, a hydraulic actuator, a control valve, a proportional solenoid valve, a main pipeline, and an overflow unit.

[0006] The power pump is used to drive the working fluid. The hydraulic actuator allows the working fluid to flow in and generates an actuating function. The control valve is arranged between the power pump and the hydraulic actuator and is used to control the actuation of the hydraulic actuator. The proportional solenoid valve is arranged between the power pump and the hydraulic actuator and is used to regulate the flow rate. The main pipeline is connected to the power pump, the hydraulic actuator, the control valve, and the proportional solenoid valve, and includes a first overflow section connected between the power pump and the proportional solenoid valve, and a second overflow section connected between the proportional solenoid valve and the control valve.

[0007] The overflow unit includes a safety valve, a first diversion channel connected between the first overflow section and the safety valve, a second diversion channel connected between the second overflow section and the safety valve, a first drainage channel connected to the safety valve and used for draining water, a second drainage channel connected between the second diversion channel and the first drainage channel, and a check valve arranged in the second drainage channel. The safety valve has a first interface connected to the first diversion channel and a second interface connected to the second diversion channel.

[0008] When the pressure in the first overflow section reaches the first overflow threshold, the safety valve will be triggered and conducted, so that the working fluid flows from the first diversion channel into the first drainage channel and is discharged. When the pressure in the second overflow section reaches the second overflow threshold, the check valve will be triggered and conducted, allowing the working fluid to flow from the second diversion channel into the second drainage channel and the first drainage channel and be discharged, and causing the pressure at the second interface to drop. When the pressure difference between the pressure at the first interface and the pressure at the second interface reaches the pressure difference threshold, the safety valve will be triggered and conducted, so that the working fluid flows into the first drainage channel via the first diversion channel and is discharged.

[0009] For the energy-saving hydraulic system of the present invention, the safety valve further has a valve body, a drainage interface arranged on the side opposite to the first interface and connected to the first drainage channel, a valve inner channel connected between the first interface and the drainage interface, a pressure detection channel connected between the first interface and the valve inner channel, a first stop group, and a second stop group. The valve body defines the first interface, the second interface, the drainage interface, the valve inner channel, and the pressure detection channel. The valve inner channel has a first diversion section and a second diversion section. The first diversion section is adjacent to and connected to the pressure detection channel. The second diversion section is spaced apart from the first diversion section and is not connected to the pressure detection channel. The first stop group is arranged at the junction of the first diversion section and the pressure detection channel. The second stop group is arranged in the second diversion section and is partially buried in the valve body.

[0010] The energy-saving hydraulic system of the present invention, the first stop group of the safety valve has a first stop member protruding from the pressure detection channel into the first shunt section, a abutting member disposed in the pressure detection channel and adjacent to the second interface, and a first spring connected between the first stop member and the abutting member. The abutting member is fixed to the valve body and has a through hole communicating from one side of the second interface to one side of the first stop member. When the pressure difference between the pressure at the first interface and the pressure at the second interface reaches the pressure difference threshold value, the first spring is compressed and causes the first stop member to retract into the pressure detection channel.

[0011] The energy-saving hydraulic system of the present invention, the second stop group of the safety valve has a second stop member protruding from the valve body into the second shunt section, and a second spring connected between the second stop member and the valve body. When the pressure in the first overflow section reaches the first overflow threshold value, the second spring is compressed and causes the second stop member to retract into the valve body.

[0012] The energy-saving hydraulic system of the present invention, the overflow unit further includes a throttle valve disposed in the second shunt channel.

[0013] The energy-saving hydraulic system of the present invention, the hydraulic actuator is a hydraulic cylinder.

[0014] The energy-saving hydraulic system of the present invention, the control valve is a three-position four-way valve.

[0015] The beneficial effect of the present invention is that: by guiding the pressure of the second overflow section to the check valve and the second interface through the second shunt channel, the safety valve can be triggered even when the opening of the proportional solenoid valve becomes smaller, reducing the load of the power pump, thereby producing an energy-saving effect. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of an existing hydraulic system;

[0017] Figure 2 is a schematic structural diagram of an embodiment of the energy-saving hydraulic system of the present invention;

[0018] Figure 3 is a timing diagram of the energization of a proportional solenoid valve of this embodiment;

[0019] Figure 4 is a schematic structural diagram of a safety valve of this embodiment. Detailed Description of the Invention

[0020] The present invention will be described in detail below with reference to the drawings and embodiments.

[0021] Refer to Figure 2 AndFigure 3 , an embodiment of the energy-saving hydraulic system of the present invention includes a power pump 1, a hydraulic actuator 2, a control valve 3, a proportional solenoid valve 4, a main pipeline 5, and an overflow unit 6.

[0022] The power pump 1 is used to drive a working fluid (not shown in the figure). The hydraulic actuator 2 allows the working fluid to flow in and generates an actuation function. The control valve 3 is disposed between the power pump 1 and the hydraulic actuator 2 and is used to control the actuation of the hydraulic actuator 2. The proportional solenoid valve 4 is disposed between the power pump 1 and the hydraulic actuator 2 and is used to regulate the flow rate. The main pipeline 5 is connected to the power pump 1, the hydraulic actuator 2, the control valve 3, and the proportional solenoid valve 4, and includes a first overflow section 51 connected between the power pump 1 and the proportional solenoid valve 4, and a second overflow section 52 connected between the proportional solenoid valve 4 and the control valve 3.

[0023] It should be noted that in this embodiment, the hydraulic actuator 2 is a hydraulic cylinder, and the control valve 3 is a three-position four-way valve. However, this is only an example here. Those skilled in the art can adopt different component configurations according to requirements to achieve the actuation function, and should not be limited thereto.

[0024] The overflow unit 6 includes a safety valve 61, a first diversion channel 63 connected between the first overflow section 51 and the safety valve 61, a second diversion channel 64 connected between the second overflow section 52 and the safety valve 61, a first drainage channel 65 connected to the safety valve 61 and used for draining water, a second drainage channel 66 connected between the second diversion channel 64 and the first drainage channel 65, a check valve 67 disposed in the second drainage channel 66, and a throttle valve 68 disposed in the second diversion channel 64.

[0025] Further referring to Figure 4 , the safety valve 61 has a valve body 611, a first interface 612 connected to the first diversion channel 63, a second interface 613 connected to the second diversion channel 64, a drainage interface 614 disposed on a side opposite to the first interface 612 and connected to the first drainage channel 65, a valve inner channel 615 connected between the first interface 612 and the drainage interface 614, a pressure detection channel 616 connected between the first interface 612 and the valve inner channel 615, a first stop group 617, and a second stop group 618.

[0026] The valve body 611 defines the first interface 612, the second interface 613, the drain interface 614, the internal valve passage 615 and the pressure detection passage 616. The internal valve passage 615 has a first diversion section 619 and a second diversion section 620. The first diversion section 619 is adjacent to and communicates with the pressure detection passage 616. The second diversion section 620 is spaced from the first diversion section 619 and is not in communication with the pressure detection passage 616. The first stop group 617 is disposed at the junction of the first diversion section 619 and the pressure detection passage 616. The second stop group 618 is disposed in the second diversion section 620 and is partially embedded in the valve body 611.

[0027] The first stop group 617 has a first stop member 621 protruding from the pressure detection passage 616 into the first diversion section 619, a abutting member 622 disposed in the pressure detection passage 616 and adjacent to the second interface 613, and a first spring 623 connecting the first stop member 621 and the abutting member 622. The abutting member 622 is fixed to the valve body 611 and has a through hole 624 communicating from one side of the second interface 613 to one side of the first stop member 621. The second stop group 618 has a second stop member 625 protruding from the valve body 611 into the second diversion section 620, and a second spring 626 connecting the second stop member 625 and the valve body 611.

[0028] Since the first diversion passage 63 is connected between the first overflow section 51 and the safety valve 61, the pressure in the first overflow section 51 is guided to the first interface 612. When the pressure in the first overflow section 51 reaches a first overflow threshold, the second stop member 625 will bear the pressure from the first interface 612, causing the second spring 626 to be compressed and the second stop member 625 to retract into the valve body 611. The working fluid can then pass through the second diversion section 620 and reach the drain interface 614. In other words, at this time the safety valve 61 is triggered and conducted, so that the working fluid can flow from the first diversion passage 63 into the first drain passage 65 and be discharged. In this way, it is possible to prevent the pressure in the main pipeline 5 from being too high and causing damage to the power pump 1 or the hydraulic cylinder due to excessive load. It is worth mentioning that in this embodiment, the first overflow threshold depends on the rigidity of the second spring 626. Therefore, when applying this embodiment, the second spring 626 with a rigidity meeting the requirements can be freely selected to set the first overflow threshold.

[0029] Further, when the opening degree of the proportional solenoid valve 4 becomes smaller, the flow rate through the proportional solenoid valve 4 also becomes smaller. This will cause a pressure difference to be generated between the first overflow section 51 and the second overflow section 52. At this time, if the pressure within the second overflow section 52 reaches a second overflow threshold value, the check valve 67 will be triggered and conduct, enabling the working fluid to flow from the second diversion channel 64 into the second drainage channel 66 and the first drainage channel 65 and be discharged, and causing the pressure at the second interface 613 to drop.

[0030] Since the abutting member 622 has the through hole 624, the pressure at the second interface 613 will be guided to the first stopper 621. When the pressure difference between the pressure at the first interface 612 and the pressure at the second interface 613 reaches a pressure difference threshold value, the first stopper 621 will withstand the pressure from the first interface 612 and overcome the pressure from the second interface 613 and the rigidity of the first spring 623, resulting in the first spring 623 being compressed and the first stopper 621 retracting into the pressure detection channel 616. At this time, the working fluid can pass through the first diversion section 619 and reach the drainage interface 614. In other words, at this time the safety valve 61 is triggered and conducts, so the working fluid can flow from the first diversion channel 63 into the first drainage channel 65 and be discharged. In this way, when the opening degree of the proportional solenoid valve 4 becomes smaller, the safety valve 61 can also be triggered and conduct, thereby reducing the load on the power pump 1 and further producing an energy-saving effect.

[0031] It is worth noting that since the pressure at the first interface 612 comes from the first overflow section 51 at a relatively upstream location, and the pressure at the second interface 613 comes from the second overflow section 52 at a relatively downstream location, the pressure at the first interface 612 will inevitably be greater than the pressure at the second interface 613. The key lies only in: whether the pressure difference between the pressure at the first interface 612 and the pressure at the second interface 613 can overcome the rigidity of the first spring 623. Therefore, in this embodiment, the pressure difference threshold value depends on the rigidity of the first spring 623, and when applying this embodiment, a first spring 623 with a rigidity that meets the requirements can be freely selected to set the pressure difference threshold value.

[0032] In addition, the throttle valve 68 can stabilize the flow rate within the second diversion channel 64 and prevent the check valve 67 from being triggered and conducting due to momentary pressure fluctuations.

[0033] In summary, the energy-saving hydraulic system of the present invention guides the pressure of the second overflow section 52 to the check valve 67 and the second interface 613 through the second diversion channel 64, enabling the safety valve 61 to also be triggered when the opening degree of the proportional solenoid valve 4 becomes smaller, reducing the load on the power pump 1, and thus producing an energy-saving effect, so it can indeed achieve the object of the present invention.

Claims

1. An energy-saving hydraulic system, comprising a power pump, a hydraulic actuator, a control valve, a proportional solenoid valve, a main pipeline, and an overflow unit; Characterized in that: The power pump is used to drive the working fluid; The hydraulic actuator allows the working fluid to flow in and generates an actuating function; The control valve is arranged between the power pump and the hydraulic actuator and is used to control the actuation of the hydraulic actuator; The proportional solenoid valve is arranged between the power pump and the hydraulic actuator and is used to regulate the flow rate; The main pipeline is communicated with the power pump, the hydraulic actuator, the control valve, and the proportional solenoid valve. The main pipeline includes a first overflow section connected between the power pump and the proportional solenoid valve, and a second overflow section connected between the proportional solenoid valve and the control valve; The overflow unit includes a safety valve, a first shunt channel connected between the first overflow section and the safety valve, a second shunt channel connected between the second overflow section and the safety valve, a first drainage channel connected to the safety valve and used for draining water, a second drainage channel connected between the second shunt channel and the first drainage channel, and a check valve arranged on the second drainage channel. The safety valve has a first interface connected to the first shunt channel and a second interface connected to the second shunt channel. When the pressure in the first overflow section reaches a first overflow threshold, the safety valve is triggered and conducted, so that the working fluid flows from the first shunt channel into the first drainage channel and is discharged. When the pressure in the second overflow section reaches a second overflow threshold, the check valve is triggered and conducted, so that the working fluid flows from the second shunt channel into the second drainage channel and the first drainage channel and is discharged, and the pressure at the second interface drops. When the pressure difference between the pressure at the first interface and the pressure at the second interface reaches a pressure difference threshold, the safety valve is triggered and conducted, so that the working fluid flows into the first drainage channel and is discharged through the first shunt channel.

2. The energy-saving hydraulic system according to claim 1, Characterized in that: The safety valve further has a valve body, a drainage interface arranged on the side opposite to the first interface and connected to the first drainage channel, a valve inner channel connected between the first interface and the drainage interface, a pressure detection channel connected between the first interface and the valve inner channel, a first stop group, and a second stop group. The valve body defines the first interface, the second interface, the drainage interface, the valve inner channel, and the pressure detection channel. The valve inner channel has a first shunt section and a second shunt section. The first shunt section is adjacent to and communicated with the pressure detection channel. The second shunt section is spaced from the first shunt section and is not communicated with the pressure detection channel. The first stop group is arranged at the junction of the first shunt section and the pressure detection channel. The second stop group is arranged on the second shunt section and is partially buried in the valve body.

3. The energy-saving hydraulic system according to claim 2, Characterized in that: The first stop group of the safety valve has a first stop member protruding from the pressure detection channel into the first diversion section, a abutting member disposed in the pressure detection channel and adjacent to the second interface, and a first spring connected between the first stop member and the abutting member. The abutting member is fixed to the valve body and has a through hole communicating from one side of the second interface to one side of the first stop member. When the pressure difference between the pressure at the first interface and the pressure at the second interface reaches the pressure difference threshold, the first spring is compressed and the first stop member retracts into the pressure detection channel.

4. The energy-saving hydraulic system according to claim 2, wherein: The second stop group of the safety valve has a second stop member protruding from the valve body into the second diversion section, and a second spring connected between the second stop member and the valve body. When the pressure in the first overflow section reaches the first overflow threshold, the second spring is compressed and the second stop member retracts into the valve body.

5. The energy-saving hydraulic system according to claim 1, wherein: The overflow unit further includes a throttle valve disposed in the second diversion channel.

6. The energy-saving hydraulic system according to claim 1, wherein: The hydraulic actuator is a hydraulic cylinder.

7. The energy-saving hydraulic system according to claim 1, wherein: The control valve is a three-position four-way valve.

Images