TWI755182B - Energy-saving hydraulic system - Google Patents

Abstract

An energy-saving hydraulic system includes a power pump, a hydraulic actuator, a control valve, a proportional solenoid valve, a main line, and an overflow unit. The main line includes a first overflow section and a second overflow section. The overflow unit includes a safety valve, a first branch channel connected between the first overflow section and the safety valve, and a second branch channel connected between the second overflow section and the safety valve aisle. 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 to conduct, so that the working fluid is discharged. In the present invention, the safety valve can be triggered even when the opening degree of the proportional solenoid valve is reduced by the second diverting channel, thereby reducing the load of the power pump, thereby producing an energy saving effect.

Description

Energy-saving hydraulic system

The present invention relates to an actuating assembly, in particular to an energy-saving hydraulic system.

An existing hydraulic system includes a power pump, a hydraulic cylinder, a control valve disposed between the power pump and the hydraulic cylinder and used to control the action of the hydraulic cylinder, and a control valve disposed between the power pump and the control valve A proportional solenoid valve for regulating flow, a safety valve disposed between the power pump and the proportional solenoid valve, and a communication with the power pump, the hydraulic cylinder, the control valve, the proportional solenoid valve, and the safety valve 's pipeline. The working fluid will pass through the safety valve, the proportional solenoid valve and the control valve from the power pump in sequence along the pipeline and arrive at the hydraulic cylinder. By controlling the control valve, the operator can control the actuation of the hydraulic cylinder and link other mechanical structures to achieve the actuation function. By controlling the proportional solenoid valve, the operator can further control the flow into the hydraulic cylinder, thereby controlling the speed and force of the hydraulic cylinder when it is actuated. When the pressure in the pipeline is too large and reaches an overflow threshold, the safety valve will be triggered and turned on, so that the working fluid is discharged from the safety valve to prevent the power pump or the hydraulic cylinder from being damaged due to excessive load.

However, in the process of controlling the proportional solenoid valve, if the proportional solenoid valve The opening of the valve becomes smaller, the flow through the proportional solenoid valve also becomes smaller. This causes a corresponding rise in pressure upstream of the proportional solenoid valve. However, the rising pressure may not necessarily exceed the relief threshold, so the safety valve may not be triggered immediately. The safety valve will not be triggered until the pressure rises to the overflow threshold. In this case, the power pump still bears a high load, and although it is not damaged, it consumes a lot of energy.

Therefore, the purpose of the present invention is to provide an energy-saving hydraulic system that reduces load and saves energy.

Therefore, 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 line, and an overflow unit.

The power pump is used to drive a working fluid. The hydraulic actuator feeds the working fluid and produces an actuation 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 for regulating flow. The main line communicates with the power pump, the hydraulic actuator, the control valve, and the proportional solenoid valve, and includes a first relief section connected between the power pump and the proportional solenoid valve, and a first relief section connected between the power pump and the proportional solenoid valve. A second relief section between the proportional solenoid valve and the control valve.

The overflow unit includes a safety valve, a first branch channel connected between the first overflow section and the safety valve, and a second branch channel connected between the second overflow section and the safety valve , a first drainage channel connected to the safety valve and used for drainage a channel, a second drainage channel connected between the second shunt channel and the first drainage channel, and a check valve disposed in the second drainage channel. The safety valve has a first port connected with the first shunt channel, and a second port connected with the second shunt channel.

When the pressure in the first overflow section reaches a first overflow threshold, the safety valve will be triggered and turned on, so that the working fluid flows into the first drainage channel from the first shunt channel and is discharged. When the pressure in the second overflow section reaches a second overflow threshold, the check valve will be triggered and turned on, so that the working fluid flows from the second branch channel into the second drainage channel and the first drainage channel channel and discharge, and the pressure at the second port is reduced. 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 will be triggered and turned on, so that the working fluid flows into the second through the first shunt channel A drain channel and drain.

The effect of the present invention is that: the pressure of the second overflow section is guided to the check valve and the second interface through the second shunt channel, so that the safety valve can also be released when the opening degree of the proportional solenoid valve becomes smaller. can be triggered to reduce the load of the power pump, thereby producing an energy saving effect.

1: Power pump

2: Hydraulic Actuator

3: Control valve

4: Proportional solenoid valve

5: Main Line

51: The first overflow section

52: Second overflow section

6: Overflow unit

61: Safety valve

611: valve body

612: The first interface

613: Second interface

614: Drainage interface

615: In-valve channel

616: pressure detection channel

617: First stop group

618: Second stop group

619: First Diversion Section

620: Second split section

621: First stopper

622: Abutment

623: First Spring

624: Through hole

625:Second stop

626: Second Spring

63: The first shunt channel

64: Second shunt channel

65: First drainage channel

66: Second drainage channel

67: Check valve

68: Throttle valve

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: FIG. 1 is a schematic structural diagram of an embodiment of the energy-saving hydraulic system of the present invention; FIG. 2 is a timing diagram of a power-on amount of a proportional solenoid valve of the embodiment; FIG. 3 is a schematic structural diagram of a hydraulic system without applying the technical means of the present case; and FIG. 4 is a structural schematic diagram of a safety valve of the embodiment. .

1, 2 and 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 line 5, and An overflow unit 6 .

The power pump 1 is used to drive a working fluid (not shown in the drawings). The hydraulic actuator 2 provides the inflow of the working fluid and produces an actuation function. The control valve 3 is arranged between the power pump 1 and the hydraulic actuator 2 and is used to control the hydraulic actuator 2 to act. The proportional solenoid valve 4 is arranged between the power pump 1 and the hydraulic actuator 2 and is used to adjust the flow. The main line 5 communicates with the power pump 1 , the hydraulic actuator 2 , the control valve 3 , and the proportional solenoid valve 4 , and includes a first overflow connected between the power pump 1 and the proportional solenoid valve 4 Flow section 51 , and a second overflow section 52 connected between the proportional solenoid valve 4 and the control valve 3 .

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, but this is just an example, and those skilled in the art can use different The configuration of components to achieve the actuation function should not be limited thereto.

The overflow unit 6 includes a safety valve 61, a valve connected to the first overflow section 51 and the safety valve 61, a first shunt channel 63, a second shunt channel 64 connected between the second overflow section 52 and the safety valve 61, a second shunt channel 64 connected to the safety valve 61 and used for drainage. The first drainage channel 65, a second drainage channel 66 connected between the second branch channel 64 and the first drainage channel 65, a check valve 67 disposed in the second drainage channel 66, and a The throttle valve 68 of the second branch passage 64 .

Further referring to FIG. 4 , the safety valve 61 has a valve body 611 , a first port 612 connected to the first shunt channel 63 , a second port 613 connected to the second shunt channel 64 , a second port 613 disposed opposite to the A drain port 614 connected to the first drain channel 65 on one side of the first port 612 , a valve inner channel 615 connected between the first port 612 and the drain port 614 , a valve inner channel 615 connected to the first port The pressure detection channel 616 between 612 and the valve inner channel 615 , a first blocking group 617 , and a second blocking group 618 .

The valve body 611 defines the first port 612 , the second port 613 , the drain port 614 , the valve inner channel 615 and the pressure detection channel 616 . The valve inner channel 615 has a first flow dividing section 619 and a second flow dividing section 620 . The first diverter section 619 is adjacent to and communicated with the pressure detection channel 616 . The second diversion section 620 is spaced from the first diversion section 619 and is not communicated with the pressure detection channel 616 . The first blocking group 617 is disposed at the junction of the first diverting section 619 and the pressure detection channel 616 . The second blocking group 618 is disposed in the second diverting section 620 and partially embedded in the valve body 611 .

The first blocking group 617 has a protrusion extending from the pressure detection channel 616 to the first stopper group 617 . A first stopper 621 in the diverting section 619, an abutment 622 disposed in the pressure detection channel 616 and adjacent to the second port 613, and a connection between the first stopper 621 and the second port 613 The first spring 623 between the abutting pieces 622 . The abutting member 622 is fixed to the valve body 611 and has a through hole 624 that communicates from one side of the second port 613 to one side of the first blocking member 621 . The second blocking group 618 has a second blocking member 625 protruding from the valve body 611 into the second diverting section 620 , and a second blocking member 625 connected between the second blocking member 625 and the valve body 611 the second spring 626.

Since the first branch passage 63 is connected between the first relief section 51 and the safety valve 61 , the pressure in the first relief section 51 will be guided to the first port 612 . When the pressure in the first overflow section 51 reaches a first overflow threshold, the second stopper 625 will bear the pressure from the first port 612, causing the second spring 626 to be compressed and making the The second stopper 625 is retracted into the valve body 611 . The working fluid can then pass through the second branching section 620 and reach the drain port 614 . In other words, at this time, the safety valve 61 is triggered and turned on, so the working fluid can flow into the first drainage channel 65 from the first branch channel 63 and be discharged. In this way, it is possible to prevent the power pump 1 or the hydraulic cylinder from being damaged due to excessive load caused by the excessive pressure of the main line 5 . It is worth mentioning that, in this embodiment, the first overflow threshold is determined by the rigidity of the second spring 626 . Therefore, when this embodiment is applied, the second spring 626 with rigidity that meets the requirements can be freely selected to set the first overflow threshold.

Also, when the opening degree of the proportional solenoid valve 4 becomes small, the proportional solenoid valve 4 passes through the 4's flow will also be smaller. This will result in a pressure difference between the first overflow section 51 and the second overflow section 52 . At this time, if the pressure in the second overflow section 52 reaches a second overflow threshold, the check valve 67 will be triggered and turned on, so that the working fluid flows from the second branch channel 64 into the second drainage channel 66 is discharged in parallel with the first drainage channel 65, and the pressure at the second port 613 is reduced.

Since the abutting member 622 has the through hole 624 , the pressure at the second interface 613 will be guided to the first blocking member 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, the first stopper 621 will be overcome by the pressure from the first interface 612 The pressure from the second port 613 and the rigidity of the first spring 623 cause the first spring 623 to be compressed and the first stopper 621 to retract into the pressure detection channel 616 . At this time, the working fluid can pass through the first branching section 619 and reach the drainage port 614 . In other words, at this time, the safety valve 61 is triggered and turned on, so the working fluid can flow into the first drainage channel 65 from the first branch channel 63 and be discharged. In this way, when the opening of the proportional solenoid valve 4 becomes smaller, the safety valve 61 can also be triggered and turned on, thereby reducing the load of the power pump 1 , thereby producing the effect of saving energy.

It is worth noting that, since the pressure at the first port 612 comes from the first overflow section 51 at the upstream side, the pressure at the second port 613 comes from the second overflow section at the downstream side 52 , the pressure at the first port 612 is bound to be greater than the pressure at the second port 613 . The key point is only: the pressure at the first interface 612 Whether the pressure difference between the force 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 is determined by the rigidity of the first spring 623 . When applying this embodiment, a first spring 623 whose rigidity meets the requirements can be freely selected to set the pressure difference threshold.

In addition, the throttle valve 68 can stabilize the flow in the second branch passage 64, preventing the check valve 67 from being triggered and conducting due to instantaneous pressure fluctuations.

To sum up, 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 diverting channel 64, so that the safety valve 61 is in the When the opening degree of the proportional solenoid valve 4 becomes smaller, it can also be triggered to reduce the load of the power pump 1, thereby producing an energy saving effect, so the object of the present invention can be achieved.

However, the above are only examples of the present invention, and should not limit the scope of implementation of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the patent specification are still included in the scope of the present invention. within the scope of the invention patent.

1: Power pump

2: Hydraulic Actuator

3: Control valve

4: Proportional solenoid valve

5: Main Line

51: The first overflow section

52: Second overflow section

6: Overflow unit

61: Safety valve

63: The first shunt channel

64: Second shunt channel

65: First drainage channel

66: Second drainage channel

67: Check valve

68: Throttle valve

Claims (7)

An energy-saving hydraulic system, comprising: a power pump for driving a working fluid; a hydraulic actuator for the working fluid to flow in and generate an actuation function; a control valve, which is arranged between the power pump and the hydraulic actuator between and used to control the action of the hydraulic actuator; a proportional solenoid valve, arranged between the power pump and the hydraulic actuator and used to adjust the flow; a main line, connected with the power pump and the hydraulic actuator , the control valve and the proportional solenoid valve are connected, and the main line includes a first relief section connected between the power pump and the proportional solenoid valve, and a first overflow section connected between the proportional solenoid valve and the control valve a second overflow section; and an overflow unit, comprising a safety valve, a first branch channel connected between the first overflow section and the safety valve, a first flow channel connected between the second overflow section and the safety valve a second shunt channel between the valves, a first drainage channel connected to the safety valve and used for drainage, a second drainage channel connected between the second shunt channel and the first drainage channel, and a The check valve of the second drainage channel, the safety valve has a first interface connected with the first branch channel, and a second interface connected with the second branch channel. When the pressure reaches a first overflow threshold, the safety valve will be triggered and turned on, so that the working fluid flows into the first drainage channel from the first shunt channel and is discharged. When the pressure in the second overflow section reaches a When the second overflow threshold is reached, the check valve is triggered and turned on, so that the working fluid flows into the second drainage channel and the first drainage channel from the second shunt channel And discharge, and make the pressure at the second interface drop, 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 will be triggered to conduct , so that the working fluid flows into the first drainage channel through the first shunt channel and is discharged. The energy-saving hydraulic system according to claim 1, wherein the safety valve further has a valve body, a drain port arranged on a side opposite to the first port and connected to the first drain channel, and a drain port connected to the first port. The valve inner channel between the first interface and the drain 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 The body defines the first interface, the second interface, the drain interface, the valve inner channel and the pressure detection channel, the valve inner channel has a first splitting section, and a second splitting section, the first splitting section is adjacent and communicated with the pressure detection channel, the second diversion section is spaced from the first diversion section and is not communicated with the pressure detection channel, the first stop group is arranged between the first diversion section and the pressure detection channel At the junction, the second blocking group is disposed on the second branching section and partially embedded in the valve body. The energy-saving hydraulic system according to claim 2, wherein the first stopper group of the safety valve has a first stopper protruding from the pressure detection channel into the first diversion section, a first stopper disposed in the detection an abutting piece in the pressure channel and adjacent to the second interface, and a first spring connected between the first blocking piece and the abutting piece, the abutting piece is fixed to the valve body and has a A through hole communicated from one side of the second interface to one side of the first stopper, 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 makes the first stopper retract into the pressure detection aisle. The energy-saving hydraulic system as claimed in claim 2, wherein the second stopper group of the safety valve has a second stopper protruding from the valve body into the second diversion section, and a second stopper connected to the first stopper. A second spring between the second stopper and the valve body, when the pressure in the first overflow section reaches the first overflow threshold, the second spring is compressed and makes the second stopper retract the valve body. The energy-saving hydraulic system according to claim 1, wherein the overflow unit further comprises a throttle valve disposed in the second branch passage. The energy-saving hydraulic system of claim 1, wherein the hydraulic actuator is a hydraulic cylinder. The energy-saving hydraulic system according to claim 1, wherein the control valve is a three-position four-way valve.

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