Energy-saving gas-liquid hybrid power system

Abstract

The energy-saving gas-liquid mixed action system comprises a liquid-controlled gas cylinder and a hydraulic pump (external oil source). The gas cylinder outlet is connected with the rod cavity of the gas cylinder directly, connected with the rodless cavity of the gas cylinder through a first electromagnetic valve, and connected with a gas charging interface through a first one-way valve, which is used for charging and pressure maintaining of the gas cylinder. The rodless cavity of the gas cylinder is connected with the gas cavity of the liquid-controlled gas cylinder through a second one-way valve, and the gas cavity is connected with the gas cylinder through a second electromagnetic valve. The liquid-controlled gas pump is installed on the pipeline between the second electromagnetic valve and the second one-way valve. The hydraulic pump (external oil source) controls the oil pressure in the oil cavity of the liquid-controlled gas cylinder through a third electromagnetic valve, so as to control the volume of the gas cavity. After the piston rod of the gas cylinder completes the "extension" action according to the instruction, the high-pressure gas in the rodless cavity is recovered into the gas cylinder while the "recovery" action is completed, so that the energy recovery of the gas under pressure is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic / pneumatic transmission, in particular to an energy-saving gas-liquid hybrid transmission system. BACKGROUND

[0002] In a multifunctional machine or device, there are often hydraulic system and pneumatic system, and hydraulic pump and air pump are used to provide power for the hydraulic system and pneumatic system respectively. In the pneumatic system, when the required flow of the cylinder is greater than the output flow of the air pump, the gas cylinder is often used to provide power output, and the on-off of the pipeline is controlled by the solenoid valve to realize the rapid action of the cylinder. After the high-pressure gas drives the cylinder to complete the action, the gas remaining in the cavity with a larger volume will be directly discharged back to the low-pressure gas storage tank when the cylinder reverses, causing energy waste. After the cylinder completes an action, the high-pressure air pump needs to suck the gas from the low-pressure gas storage tank and recharge the gas cylinder through the pipeline, and the existence of the air pump and the low-pressure gas storage tank will directly affect the overall size and weight of the actuating system, making the actuating system difficult to arrange. SUMMARY

[0003] In order to overcome the problems of energy waste, complex structure and pressure deviation in the prior art, the present application provides an energy-saving gas-liquid hybrid transmission system.

[0004] The technical scheme adopted by the present application is as follows: an energy-saving gas-liquid hybrid transmission system, comprising a hydraulic control cylinder, a third solenoid valve and a hydraulic pump, one side of the hydraulic control cylinder piston is connected to an oil chamber through oil, and the other side of the hydraulic control cylinder piston is connected to a gas chamber through gas; the hydraulic pump is connected to an oil source, and the hydraulic pump is connected to the liquid chamber of the hydraulic control cylinder through the third solenoid valve; the third solenoid valve controls the oil pressure of the liquid chamber of the hydraulic control cylinder, thereby changing the pressure of the liquid chamber of the hydraulic control cylinder; the hydraulic control cylinder piston moves under the combined force of the oil chamber and the gas chamber, when the driving force of the liquid chamber is greater than the driving force of the gas chamber, the hydraulic control cylinder piston moves to the side with a smaller volume of the gas chamber; when the driving force of the liquid chamber is less than the driving force of the gas chamber, the piston of the hydraulic control cylinder moves to the side with a larger volume of the gas chamber.

[0005] The gas chamber of the hydraulic control cylinder is connected to the rodless chamber of the cylinder through a second one-way valve, when the gas pressure in the cylinder is greater than the gas pressure in the gas chamber of the hydraulic control cylinder, the second one-way valve is opened, and the gas in the rodless chamber of the cylinder enters the gas chamber of the hydraulic cylinder; when the gas pressure in the cylinder is less than the gas pressure in the gas chamber of the hydraulic control cylinder, the second one-way valve is closed.

[0006] The gas chamber of the hydraulic control cylinder is connected to the inlet of the gas cylinder through a second solenoid valve, when the volume of the gas chamber of the hydraulic control cylinder decreases, the second solenoid valve is opened, and the gas in the gas chamber of the hydraulic control cylinder is discharged into the gas cylinder to pressurize the gas cylinder; when the volume of the gas chamber of the hydraulic control cylinder increases, the second solenoid valve is opened, and the gas in the gas cylinder is discharged into the gas chamber of the hydraulic control cylinder to unload the gas cylinder.

[0007] The cylinder is a double-acting single-out-rod cylinder, a rodless cavity of the cylinder is connected with an outlet of the gas cylinder through the first electromagnetic valve, a rod cavity of the cylinder is directly connected with the outlet of the gas cylinder, and the piston of the cylinder moves under the combined force of the gas in the rod cavity and the rodless cavity.

[0008] When the first electromagnetic valve is opened, the pressures on both sides of the cylinder piston are the same, the force area of the rodless cavity of the cylinder is larger than that of the rod cavity of the cylinder, and the cylinder piston is quickly extended; when the first electromagnetic valve is closed, the third electromagnetic valve is opened, the liquid control cylinder piston liquid cavity pressure is lower than the gas cavity pressure, the liquid control cylinder piston moves to the direction of the larger gas cavity volume, at this time, the gas in the cylinder flows into the liquid control cylinder gas cavity, the gas pressure in the rodless cavity of the cylinder becomes smaller, and when the driving force on the rod cavity side of the cylinder piston is greater than that on the rodless cavity side, the cylinder piston is retracted.

[0009] Further, the cylinder is replaced by a spring return type single-out-rod cylinder from a double-acting single-out-rod cylinder, a return spring is installed in the rod cavity of the spring return type single-out-rod cylinder, and the return spring provides a return power for the piston of the spring return type single-out-rod cylinder.

[0010] Further, the maximum volume of the gas cavity of the liquid control cylinder is large enough so that when the gas in the rodless cavity of the cylinder completely enters, the driving force of the gas in the gas cavity of the liquid control cylinder on the cylinder piston is smaller than the driving force of the high-pressure gas in the rod cavity of the cylinder; when the cylinder piston returns to the upper limit, the second electromagnetic valve is opened to press the gas in the gas cavity of the liquid control cylinder into the gas cylinder; or, the volume of the gas cavity of the liquid control cylinder is small, and the retraction of the cylinder piston and the recovery of the gas are completed through multiple opening / closing of the second electromagnetic valve.

[0011] Further, the inlet of the gas cylinder is connected with a gas charging device through a first one-way valve, and the first one-way valve only allows the gas cylinder to be charged; the gas charging device is used for pre-charging of the gas pressure in the system, and after the pre-charging reaches the rated pressure, the gas charging device is removed.

[0012] Further, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are respectively electrically connected with the controller, when the controller issues an extension instruction, the first electromagnetic valve is opened, the second electromagnetic valve and the third electromagnetic valve are closed, and the cylinder piston is extended; when the controller issues a retraction instruction, the first electromagnetic valve is closed, the third electromagnetic valve is opened, the cylinder piston is retracted, then the third electromagnetic valve is powered off, the second electromagnetic valve is powered on, the gas in the liquid control cylinder is charged into the gas cylinder, if one action of the liquid control cylinder is not enough to make the cylinder piston retract to the upper limit, the second electromagnetic valve and the third electromagnetic valve are alternately opened for multiple times, so that the cylinder piston is retracted to the upper limit; when the control system issues an unloading instruction, the second electromagnetic valve and the third electromagnetic valve are simultaneously opened, and the gas in the gas cylinder is unloaded into the gas cavity of the liquid control cylinder; when the controller issues a pressure compensation instruction, the second electromagnetic valve is opened, and the liquid control cylinder charges the gas in the gas cavity into the gas cylinder for pressure compensation.

[0013] The beneficial effects of the present application are:

[0014] 1. Using ready hydraulic system as power source, simple system structure;

[0015] 2. With gas recovery, energy saving;

[0016] 3. Pressure stability, suitable for high and low temperature environment; BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the structural schematic diagram of the present application.

[0018] The figure mark explanation: 1-cylinder, 21-first electromagnetic valve, 22-second electromagnetic valve, 23-third electromagnetic valve, 3-gas cylinder, 41-first check valve, 42-second check valve, 5-hydraulic cylinder, 6-hydraulic pump. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0020] In the description of the present application, it should be noted that, if the terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first", "second", "third" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting" appear, they should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Referring to the accompanying drawings, an energy-saving gas-liquid hybrid actuation system includes a hydraulically controlled cylinder 5, a third solenoid valve 23, and a hydraulic pump 6. One side of the piston of the hydraulically controlled cylinder 5 is an oil chamber, and the other side is an air chamber. The hydraulic pump 6 is connected to an external oil source and is connected to the liquid chamber of the hydraulically controlled cylinder 5 via the third solenoid valve 23. The third solenoid valve 23 controls the oil pressure in the liquid chamber of the hydraulically controlled cylinder 5, thereby changing the pressure within the chamber. The piston of the hydraulically controlled cylinder 5 moves under the combined force of the oil chamber and the air chamber. When the driving force of the liquid chamber is greater than the driving force of the air chamber, the piston of the hydraulically controlled cylinder 5 moves towards the side where the air chamber volume decreases; when the driving force of the liquid chamber is less than the driving force of the air chamber, the piston of the hydraulically controlled cylinder 5 moves towards the side where the air chamber volume increases.

[0023] The air chamber of the hydraulic cylinder 5 is connected to the rodless chamber of the cylinder 1 through the second check valve 42. When the gas pressure in the cylinder 1 is greater than the gas pressure in the air chamber of the hydraulic cylinder 5, the second check valve 42 opens, and the gas in the rodless chamber of the cylinder 1 enters the air chamber of the hydraulic cylinder 5. When the gas pressure in the cylinder 1 is less than the gas pressure in the air chamber of the hydraulic cylinder 5, the second check valve 42 closes.

[0024] The air chamber of the hydraulic cylinder 5 is connected to the inlet of the gas cylinder 3 via the second solenoid valve 22. When the volume of the air chamber of the hydraulic cylinder 5 decreases, the second solenoid valve 22 is opened, and the gas in the air chamber of the hydraulic cylinder 5 is discharged into the gas cylinder 3 to replenish the pressure of the gas cylinder 3. When the volume of the air chamber of the hydraulic cylinder 5 increases, the second solenoid valve 22 is opened, and the gas in the gas cylinder 3 is discharged into the air chamber of the hydraulic cylinder 5 to unload the gas cylinder 3.

[0025] The cylinder 1 is a double-acting single-rod cylinder. The rodless chamber of the cylinder 1 is connected to the outlet of the gas cylinder 3 through the first solenoid valve 21, and the rod chamber of the cylinder 1 is directly connected to the outlet of the gas cylinder 3. The piston of the cylinder 1 moves under the combined force of the gas in the rod chamber and the rodless chamber.

[0026] When the first solenoid valve 21 is opened, the pressure on both sides of the piston of cylinder 1 is the same, and the force-bearing area on the rodless side of cylinder 1 is greater than that on the rod side of cylinder 1, causing the piston of cylinder 1 to extend rapidly. When the first solenoid valve 21 is closed, the third solenoid valve 23 is opened, and the pressure in the liquid chamber of the piston of the hydraulically controlled cylinder 5 is lower than that in the air chamber. The piston of the hydraulically controlled cylinder 5 moves in the direction where the air chamber volume increases. At this time, the gas in cylinder 1 flows into the air chamber of the hydraulically controlled cylinder 5, and the gas pressure in the rodless chamber of cylinder 1 decreases. When the driving force on the rod side of the piston of cylinder 1 is greater than that on the rodless side, the piston of cylinder 1 retracts.

[0027] In embodiments of the present invention, the cylinder can be any form. When it is selected as a spring-return single-rod cylinder, a return spring is installed in its rod chamber to provide return power to its piston. When it is selected as a double-acting double-rod cylinder, the connection and disconnection of the two chambers on both sides of the piston needs to be controlled by a solenoid valve, and the gas recovery needs to be connected to the side with the smaller force area.

[0028] In the embodiment of the present application, the maximum volume of the air chamber of the hydraulic control cylinder 5 is large enough so that when the gas in the rodless chamber of the cylinder 1 is completely filled, the driving force of the gas in the air chamber of the hydraulic control cylinder 5 to the piston of the cylinder 1 is less than the driving force of the high-pressure gas in the rod chamber of the cylinder 1; when the piston of the cylinder 1 returns to the upper limit, the second electromagnetic valve 22 is opened to press the gas in the air chamber of the hydraulic control cylinder 5 into the gas cylinder 3; or, the volume of the air chamber of the hydraulic control cylinder 5 is small, and the piston of the cylinder 1 is retracted and the gas is recovered by opening / closing the second electromagnetic valve 22 multiple times.

[0029] In the embodiment of the present application, the inlet of the gas cylinder 3 is connected to a gas filling device through the first one-way valve 41, and the first one-way valve 41 only allows the gas to be filled into the gas cylinder 3; the gas filling device is used for pre-filling the gas pressure in the system, and after the pre-filling reaches the rated pressure, the gas filling device is removed.

[0030] In the embodiment of the present application, the external hydraulic source is a power source for other purposes of a machine or equipment, and the rated pressure thereof should be not less than the rated pressure of the system.

[0031] In the embodiment of the present application, the first electromagnetic valve 21, the second electromagnetic valve 22 and the third electromagnetic valve 23 are respectively electrically connected with the controller; when the controller issues an extension instruction, the first electromagnetic valve 21 is opened, the second electromagnetic valve 22 and the third electromagnetic valve 23 are closed, and the piston of the cylinder 1 is extended; when the controller issues a retraction instruction, the first electromagnetic valve 21 is closed, the third electromagnetic valve 23 is opened, and the piston of the cylinder 1 is retracted, and then the third electromagnetic valve 23 is powered off, the second electromagnetic valve 22 is powered on, the gas in the hydraulic control cylinder 5 is filled into the gas cylinder 3, if the piston of the cylinder 1 is not retracted to the upper limit by one action of the hydraulic control cylinder 5, the second electromagnetic valve 22 and the third electromagnetic valve 23 are alternately opened multiple times, so that the piston of the cylinder 1 is retracted to the upper limit; when the control system issues an unloading instruction, the second electromagnetic valve 22 and the third electromagnetic valve 23 are simultaneously opened, and the gas in the gas cylinder 3 is unloaded into the air chamber of the hydraulic control cylinder 5; when the controller issues a pressure compensation instruction, the second electromagnetic valve 22 is opened, and the hydraulic control cylinder 5 fills the gas in the air chamber into the gas cylinder 3 to compensate the pressure.

[0032] The content described in the embodiments of the present specification is only a list of implementation forms of the inventive concept, and the protection scope of the present application should not be regarded as being limited to the specific forms stated in the embodiments, and the protection scope of the present application also extends to equivalent technical means that can be thought of by those skilled in the art according to the inventive concept.

Claims

1. An energy efficient gas-liquid hybrid propulsion system, characterized by: The hydraulic control cylinder (5) is connected with the hydraulic pump (6) through the third electromagnetic valve (23), and the third electromagnetic valve (23) controls the oil pressure of the hydraulic control cylinder (5) to change the pressure of the hydraulic control cylinder (5); the piston of the hydraulic control cylinder (5) moves under the combined force of the oil cavity and the gas cavity, and when the driving force of the liquid cavity is greater than that of the gas cavity, the piston of the hydraulic control cylinder (5) moves to the side where the volume of the gas cavity is reduced; when the driving force of the liquid cavity is less than that of the gas cavity, the piston of the hydraulic control cylinder (5) moves to the side where the volume of the gas cavity is increased; The gas cavity of the hydraulic control cylinder (5) is connected with the rodless cavity of the cylinder (1) through the second one-way valve (42), and when the gas pressure in the cylinder (1) is greater than the gas pressure in the gas cavity of the hydraulic control cylinder (5), the second one-way valve (42) is opened, and the gas in the rodless cavity of the cylinder (1) enters the gas cavity of the hydraulic control cylinder (5); when the gas pressure in the cylinder (1) is less than the gas pressure in the gas cavity of the hydraulic control cylinder (5), the second one-way valve (42) is closed; The gas cavity of the hydraulic control cylinder (5) is connected with the inlet of the gas cylinder (3) through the second electromagnetic valve (22), and when the volume of the gas cavity of the hydraulic control cylinder (5) is reduced, the second electromagnetic valve (22) is opened, and the gas in the gas cavity of the hydraulic control cylinder (5) is discharged into the gas cylinder (3) to supplement the pressure of the gas cylinder (3); when the volume of the gas cavity of the hydraulic control cylinder (5) is increased, the second electromagnetic valve (22) is opened, and the gas in the gas cylinder (3) is discharged into the gas cavity of the hydraulic control cylinder (5) to unload the gas cylinder (3); The cylinder (1) is a double-acting single-rod cylinder, the rodless cavity of the cylinder (1) is connected with the outlet of the gas cylinder (3) through the first electromagnetic valve (21), the rod cavity of the cylinder (1) is directly connected with the outlet of the gas cylinder (3), and the piston of the cylinder (1) moves under the combined force of the gas in the rod cavity and the rodless cavity; When the first electromagnetic valve (21) is opened, the pressures on both sides of the piston of the cylinder (1) are the same, the force receiving area of the rodless cavity of the cylinder (1) is greater than that of the rod cavity of the cylinder (1), and the piston of the cylinder (1) is quickly extended; when the first electromagnetic valve (21) is closed, the third electromagnetic valve (23) is opened, the liquid cavity pressure of the piston of the hydraulic control cylinder (5) is lower than the gas cavity pressure, the piston of the hydraulic control cylinder (5) moves to the side where the volume of the gas cavity is increased, and at this time, the gas in the cylinder (1) flows into the gas cavity of the hydraulic control cylinder (5), and the gas pressure in the rodless cavity of the cylinder (1) is reduced; when the driving force of the rod cavity side of the piston of the cylinder (1) is greater than that of the rodless cavity side, the piston of the cylinder (1) is retracted.

2. An energy efficient gas-liquid hybrid power system as claimed in claim 1, wherein: The cylinder (1) is replaced by a spring return type single-rod cylinder, and a return spring is arranged in the rod cavity of the spring return type single-rod cylinder to provide a return force for the piston of the spring return type single-rod cylinder.

3. An energy efficient gas-liquid hybrid power system as claimed in claim 1, wherein: The maximum volume of the gas cavity of the liquid control cylinder (5) is large enough so that when the gas in the rodless cavity of the cylinder (1) is completely entered, the driving force of the gas in the gas cavity of the liquid control cylinder (5) on the piston of the cylinder (1) is less than the driving force of the high-pressure gas in the rod cavity of the cylinder (1); when the piston of the cylinder (1) returns to the upper limit, the second electromagnetic valve (22) is opened, and the gas in the gas cavity of the liquid control cylinder (5) is pressed into the gas cylinder (3); or, the gas cavity of the liquid control cylinder (5) is selected to have a smaller volume, and the retracting of the piston of the cylinder (1) and the recycling of the gas are completed by the opening / closing of the second electromagnetic valve (22) multiple times.

4. An energy efficient gas-liquid hybrid power system as claimed in claim 1, wherein: The inlet of the gas cylinder (3) is connected to a gas charging device through a first one-way valve (41), and the first one-way valve (41) only allows the gas cylinder (3) to be charged; the gas charging device is used for pre-charging the gas pressure in the system, and after the pre-charging reaches the rated pressure, the gas charging device is removed.

5. An energy efficient gas-liquid hybrid power system as claimed in claim 1, wherein: The first electromagnetic valve (21), the second electromagnetic valve (22), and the third electromagnetic valve (23) are electrically connected with the controller, when the controller issues an extension instruction, the first electromagnetic valve (21) is opened, the second electromagnetic valve (22) and the third electromagnetic valve (23) are closed, and the piston of the cylinder (1) is extended; when the controller issues a retracting instruction, the first electromagnetic valve (21) is closed, the third electromagnetic valve (23) is opened, and the piston of the cylinder (1) is retracted, then the third electromagnetic valve (23) is powered off, the second electromagnetic valve (22) is powered on, and the gas in the liquid control cylinder (5) is charged into the gas cylinder (3), if one action of the liquid control cylinder (5) is not enough to make the piston of the cylinder (1) retract to the upper limit, the second electromagnetic valve (22) and the third electromagnetic valve (23) are opened alternately multiple times, so that the piston of the cylinder (1) retracts to the upper limit; when the control system issues an unloading instruction, the second electromagnetic valve (22) and the third electromagnetic valve (23) are opened at the same time, and the gas in the gas cylinder (3) is unloaded into the gas cavity of the liquid control cylinder (5); when the controller issues a pressure compensation instruction, the second electromagnetic valve (22) is opened, and the liquid control cylinder (5) charges the gas in the gas cavity into the gas cylinder (3) to compensate the pressure.

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