Oil-gas separation structure of hydraulic accumulator and design method

Abstract

The invention relates to an oil-gas separation structure of a hydraulic energy accumulator and a design method.The oil-gas separation structure of the hydraulic energy accumulator designed through the design method comprises the steps that at least one container liquid inlet and outlet is designed in one side of a hydraulic energy storage closed container, and an inner cavity of the hydraulic energy storage closed container is designed into a plurality of horizontally-adjacent cabins; at least one communicating cavity channel is arranged between each two cabins; and each communicating cavity channel is opened at a high point of the cabin wall of the cabin close to the direction of the container liquid inlet and outlet, and is opened at a low point of the cabin wall of the cabin far away from the container liquid inlet and outlet. The oil-gas separation structure of the hydraulic accumulator is applied to a hydraulic spring of a vehicle, gas is almost completely transferred to a cabin far away from a liquid inlet and outlet of a container along with piston movement of the hydraulic spring, and liquid is transferred to a cabin close to the liquid inlet and outlet of the container, so that dependence on a membrane or a piston can be reduced; and the liquid and the gas are effectively separated.

Description

Technical Field

[0001] The technical field of hydraulic energy storage and springs in vehicle systems, and in particular, to an oil-gas separation structure and a design method for a hydraulic energy storage device. Background Art

[0002] Hydraulic accumulators, also known as gas accumulators, play an important role in hydraulic systems. They can store the energy of hydraulic oil and release it when needed to maintain the pressure and flow of the system; absorb pressure shocks in the hydraulic system, reduce vibration and noise in the system, and protect components in the system; balance pressure fluctuations in the system to ensure stable operation of the system; and compensate for leakage of hydraulic oil when the system stops working to maintain the pressure of the system. These functions make gas accumulators an indispensable component in hydraulic systems to ensure efficient and stable operation of the system. Hydraulic accumulators can also be used in automotive suspension systems for active suspension control power, and can also be used as gas-liquid springs. In gas-liquid spring applications, gas is used as a spring for compression and extension, while liquid is used to conduct external motion and force. In certain vehicle applications, the height of the gas storage container is limited and needs to be extended horizontally to achieve the required gas volume. Due to the height limitation of the container, when the container is in motion, such as in automotive suspension system applications, the gas may overflow from the container along the pipeline into the damper or hydraulic cylinder, thereby affecting the performance of the entire system.

[0003] Existing isolation methods include using a sliding piston structure for segmentation or using a membrane to separate them. These separation methods require strict separation of the liquid part and the gas part in advance during production or maintenance, which is difficult in terms of technology. Summary of the invention

[0004] The invention relates to an oil-gas separation structure and a design method of a hydraulic accumulator, which are used to solve the above-mentioned problems of the prior art.

[0005] The present invention discloses a method for designing an oil-gas separation structure of a hydraulic accumulator, which includes: designing at least one container liquid inlet and outlet on one side of a hydraulic energy storage closed container, designing the inner cavity of the hydraulic energy storage closed container into a plurality of horizontally adjacent chambers, and setting at least one connecting cavity between each two chambers; each connecting cavity opens at a high point of the chamber wall in the chamber close to the container liquid inlet and outlet, and opens at a low point of the chamber wall in the chamber far from the container liquid inlet and outlet; the lowest edge of the high point opening of the chamber wall between two adjacent chambers is designed to be higher than the lowest edge of the low point opening of the same connecting cavity. The upper edge makes the gas in the hydraulic energy storage closed container transfer to the side away from the liquid inlet and outlet of the container with the pulsation of the hydraulic energy storage closed container, and the liquid transfers to the liquid inlet and outlet of the hydraulic energy storage closed container. In addition, in the two adjacent chambers of the connecting cavity, the liquid level in the chamber on the low point opening side is higher than the uppermost edge of the low point opening, and the volume of the liquid in the raised part is greater than the volume of the connecting cavity corresponding to the low point opening, and the liquid level in the chamber on the high point opening side is lower than the lowermost edge of the high point opening, and the volume from the lowermost edge of the high point opening to the liquid level in the chamber is greater than the volume of the connecting cavity corresponding to the high point opening.

[0006] According to an embodiment of the method for designing an oil-gas separation structure of a hydraulic accumulator of the present invention, the number of the chambers is determined according to the damping required by the hydraulic system.

[0007] According to one embodiment of the method for designing the oil-gas separation structure of the hydraulic accumulator of the present invention, the more bumpy the environment in which the vehicle is used, the smaller the distance between the two side walls of the cabin is correspondingly designed; the more stable the environment in which the vehicle is used, the larger the distance between the two side walls of the cabin is correspondingly designed.

[0008] According to an embodiment of the method for designing an oil-gas separation structure of a hydraulic accumulator of the present invention, the size and proportion of each chamber, high point opening and low point opening are determined by simulation.

[0009] According to an embodiment of the method for designing an oil-gas separation structure of a hydraulic accumulator of the present invention, the opening area is horizontally expanded through the upper and lower inner walls of the hydraulic energy storage closed container to increase the high point opening and the low point opening.

[0010] The present invention discloses an oil-gas separation structure for a hydraulic accumulator, which comprises: a hydraulic energy storage closed container, which is divided into a plurality of horizontally adjacent chambers by vertical partition walls, and at least one connecting cavity is arranged between each two chambers; the connecting cavity opens at the high point of the partition wall in the chamber close to the liquid inlet and outlet of the container, and opens at the low point in the chamber far from the liquid inlet and outlet of the container.

[0011] According to an embodiment of the oil-gas separation structure of the hydraulic accumulator of the present invention, the oil-gas separation structure of the hydraulic accumulator is designed according to a design method for an oil-gas separation structure of a hydraulic accumulator.

[0012] According to an embodiment of the oil-gas separation structure of the hydraulic accumulator of the present invention, the cavity is a pipeline or a sandwich between two adjacent compartments.

[0013] According to an embodiment of the oil-gas separation structure of the hydraulic accumulator of the present invention, the opening is a flat opening.

[0014] The present invention discloses a hydraulic spring with an oil-gas separation structure utilizing a hydraulic accumulator, which comprises a hydraulic spring body of a vehicle and an oil-gas separation structure, wherein a liquid inlet and outlet of the container are connected to the hydraulic spring of the vehicle.

[0015] According to an embodiment of the hydraulic spring of the present invention, the hydraulic energy storage sealed container is horizontally installed below the automobile beam or in the middle of the beam.

[0016] The present invention discloses a shock absorber using an oil-gas separation structure of a hydraulic accumulator, which comprises a shock absorber body of a vehicle and an oil-gas separation structure, wherein a liquid inlet and outlet of the container are connected to the shock absorber of the vehicle.

[0017] According to an embodiment of the shock absorber of the present invention, the liquid inlet and outlet of the container are connected to a compression rebound damping adjustment mechanism of the shock absorber of the vehicle.

[0018] The oil-gas separation structure of the hydraulic accumulator of the present invention can be applied to the hydraulic springs and shock absorbers of vehicles. For the hydraulic springs of vehicles, as the piston of the hydraulic spring moves, the gas will be almost completely transferred to the chamber far away from the liquid inlet and outlet of the container, while the liquid will be transferred to the chamber close to the liquid inlet and outlet of the container. In this way, the hydraulic energy storage container can reduce the dependence on the membrane or piston, and effectively separate the liquid and gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the oil-gas separation structure of the hydraulic accumulator of the present invention;

[0020] Figure 2 It is a schematic diagram of installing the oil-gas separation structure of the hydraulic accumulator of the present invention on a vehicle;

[0021] Figure 3 The schematic diagram of the gas-liquid flow in the chamber of the hydraulic accumulator of the present invention;

[0022] Figure 4 Schematic diagram of the chamber opening in the hydraulic accumulator. DETAILED DESCRIPTION

[0023] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0024] Figure 1 Schematic diagram of the oil-gas separation structure of the hydraulic accumulator of the present invention, as shown in Figure 1 As shown, the present invention proposes a liquid and gas separation structure that does not require a separation piston or a separation membrane in a hydraulic accumulator. The liquid accumulator of the present invention is generally installed horizontally on a vehicle. The oil and gas separation structure of the hydraulic accumulator includes: a hydraulic energy storage closed container 1, which is divided into a plurality of horizontally adjacent compartments by a vertical partition wall 3. For example, there is at least one connecting cavity 4 between each of the two compartments 5 and 6. The connecting cavity 4 has an opening 7 at a high point of the partition wall 3 in the compartment close to the liquid inlet and outlet 2 of the container, and an opening 8 at a low point in the compartment far from the liquid inlet and outlet of the container 1.

[0025] like Figure 1 As shown, due to the need for energy storage and shock absorption, during the driving of the vehicle, the liquid will continuously flow in and out of the container 1 in the form of surges. Since the specific gravity of gas is light and the specific gravity of liquid is heavy, the gas will float above the liquid. In this case, as long as the amount of liquid entering and leaving the container 1 is large enough, the liquid will be transferred to the chamber 5 close to the liquid inlet and outlet 2 of the container 1 or the gas will be transferred to the chamber 6 far away from the liquid inlet and outlet 2 of the container 1. The liquid will continue to flow in and out of the container 1 over and over again, and most of the gas will gradually transfer to the chamber 6 far away from the liquid inlet and outlet 2 of the container, while most of the liquid will transfer to the chamber 5 close to the liquid inlet and outlet 2 of the container. In this way, the liquid and gas are effectively separated.

[0026] Figure 2 FIG. 1 is a schematic diagram showing a liquid energy storage device of the present invention installed on a vehicle. Figure 2 As shown, the container 1 is installed horizontally below the automobile beam or in the middle of the beam.

[0027] like Figure 1 As shown, the cavity of two adjacent chambers of the container 1 can be single or multiple. Its form can be various, such as pipeline, interlayer, etc. However, it must be opened at a relatively high position in the chamber close to the liquid inlet and outlet, and at a relatively low position in the chamber far from the liquid inlet and outlet, so as to ensure that the gas will not escape from the liquid inlet and outlet in practice.

[0028] like Figure 1 As shown, the liquid inlet and outlet can also be single or multiple, depending on the specific application. The inlet and outlet should be located at the upper part of the container as much as possible to avoid gas entering and exiting the liquid inlet and outlet.

[0029] Figure 3 The schematic diagram of the hydraulic accumulator of the present invention is shown as follows: Figure 3As shown, this embodiment takes a simple case of two compartments as an example for specific analysis. In the initial state, the gas pressure inside container 1 is P0. According to the gas pressure-volume law, when a volume of liquid of dV is added from the liquid inlet and outlet, due to the limitation of the internal space of the container, when a new equilibrium is reached, the internal pressure increases to P1. As for the right compartment, since the overall volume of the right compartment remains unchanged, the increase in gas pressure means a decrease in the gas volume of the right compartment, and at the same time means an increase in the liquid volume of the right compartment. This increase in the volume of liquid needs to be compensated by the residual liquid volume inside. When the cavity between the chambers of this part of the residual liquid volume is not enough to supplement the liquid volume that needs to be increased, the air in the left compartment enters the right compartment and reaches a new equilibrium.

[0030] like Figure 1 as well as Figure 3 As shown, when a volume of dV of liquid is discharged from the liquid inlet and outlet 2, due to the limitation of the internal space of the container, when a new equilibrium is reached, the internal pressure is reduced to P2. As for the right compartment, since the overall volume of the right compartment remains unchanged, the reduction in gas pressure means an increase in the gas volume of the right compartment, and at the same time, a decrease in the liquid volume of the right compartment. This reduction in the volume of the liquid means that the liquid in the right compartment flows into the middle compartment. When this part of the inflow is large enough, it overflows into the left compartment. Continuing the operation of adding and discharging liquid in a sufficiently large amount will gradually send most of the gas in the left compartment to the right compartment, and most of the liquid in the right compartment will be transferred to the left compartment.

[0031] like Figure 1 as well as Figure 2As shown, during the use of the hydraulic energy storage container 1, the liquid will continuously enter and exit the container in a pulsating form. During the pulsating process of the liquid entering and exiting the hydraulic energy storage container 1, a portion of gas needs to be reserved in the chamber farthest from the inlet and outlet of the hydraulic energy storage container 1. The transfer of liquid and gas in adjacent chambers does not occur simultaneously. Assume that when the liquid is poured into the high point outlet side chamber from the inlet and outlet direction of the hydraulic energy storage container 1, the gas in the chamber will be compressed. If the pressure is large enough, and during the compression process, the liquid level in the high point outlet side chamber is lower than the lowest edge of the high point opening, and the volume from the lowest edge of the high point opening to the liquid level is greater than the volume in the corresponding cavity, the gas will be transferred from the chamber on the high point opening side to the chamber on the low point opening side; if in the adjacent chamber, when the liquid is sucked out from the high point chamber toward the inlet and outlet direction of the hydraulic energy storage container 1, low pressure is generated in the chamber on the high point opening side, thereby generating suction to the chamber on the low point opening side. If the liquid level in the chamber on the low point opening side is higher than the top edge of the low point opening, and the volume of the liquid in the raised part is larger than the volume of the cavity between the adjacent chambers, and assuming that the negative pressure generated by the gas expansion on the low point outlet side is not enough to resist the low pressure suction on the high point opening side, the liquid will be sucked into the cavity from the low point outlet chamber and transferred to the chamber on the high point outlet side. When the amount of liquid entering and exiting the container is large enough, there will be a transfer of liquid to the chamber close to the liquid inlet and outlet of the container or a transfer of gas to the chamber far away from the liquid inlet and outlet of the container. When external liquid enters the container, it will produce a pressurization effect, causing the gas to tend to transfer to the chamber far away from the liquid inlet and outlet; when the liquid leaves the hydraulic energy storage container 1, it will produce a decompression effect, causing the liquid to tend to transfer to the chamber close to the liquid inlet and outlet. When the amount of liquid in and out is large enough, the transfer tendency of liquid and gas becomes a substantial transfer.

[0032] like Figure 1As shown, for the design method of the oil-gas separation structure of the hydraulic accumulator of the present invention, the chamber design can generally be combined with simulation software. During the design, it is necessary to ensure that when the liquid in the chamber of the container 1 is transferred from the low point to the high point (i.e., the container 1 discharges the liquid), the following conditions are met: a cavity needs to be formed between two adjacent chambers, that is, the lowest edge of the high point opening of the chamber wall is higher than the highest edge of the low point opening of the adjacent chamber. The liquid level in the chamber on the low point opening side is higher than the highest edge of the low point opening, and the volume of the liquid in the raised part is greater than the volume in the cavity. During the driving process of the vehicle, the liquid is sucked out from the chamber at the high point outlet toward the container inlet and outlet, so that the liquid in the low point outlet chamber is sucked into the cavity. When enough liquid fills the cavity and begins to overflow into the chamber on the high point opening side, the transfer occurs. When the gas in the chamber of the container 1 is transferred from the high point to the low point, the following conditions are met: a cavity is formed between two adjacent chambers, that is, the lowest edge of the high point opening of the chamber wall is higher than the highest edge of the low point opening of the adjacent chamber. The liquid level in the chamber on the high point opening side is lower than the lowest edge of the high point opening, and the volume from the lowest edge of the high point opening to the liquid level is greater than the volume in the cavity. During the vehicle's driving, liquid (or gas) flows into the chamber on the high point opening side from the liquid inlet and outlet of the container, pushing the gas located in the upper part of the chamber into the cavity. When there is enough gas in the cavity to discharge all the liquid in the cavity, the gas begins to enter the chamber on the low point opening side to achieve transfer.

[0033] When designing the oil-gas separation structure of the hydraulic accumulator of the present invention, it is necessary to ensure that a cavity is formed between any two adjacent compartments. Preferably, under the premise of meeting the flow requirements, the cross-sectional area of ​​the cavity between the two adjacent compartments should be as small as possible, and the high point opening and the low point opening should be as narrow as possible.

[0034] Figure 4 is a schematic diagram of the chamber opening in the hydraulic accumulator, such as Figure 4 As shown, taking the upper opening as an example, if the opening area needs to be increased, the opening area should be expanded laterally or horizontally as close to the upper and lower inner walls of the container as possible, rather than increasing the opening width in the vertical direction.

[0035] Furthermore, when designing the hydraulic accumulator of the present invention, it is necessary to consider that when the hydraulic energy storage container 1 is in a pulsating motion process, a larger compartment partition will cause waves on the liquid surface, which may cause some liquid to overflow and flow back to the compartment at the lower end opening. Generally speaking, under conditions of violent motion and turbulence, the compartment partition should tend to reduce the distance between the compartment partitions; in applications with mostly smooth driving, the compartment partition should tend to increase the distance between the compartment partitions to reduce cost and complexity. The specific size of the chamber can be determined based on simulation calculation tests.

[0036] The present invention proposes a liquid and gas separation structure and a corresponding structural design method that do not require the use of a separation piston or a separation membrane in a hydraulic accumulator: the present invention divides the hydraulic energy storage container into a plurality of horizontally adjacent compartments, and there is a cavity between every two compartments. According to the use environment of the vehicle, for the case of more road bumps, more chambers can be set to generate more damping for the hydraulic system. This cavity opens at the high point of the next door in the compartment close to the liquid inlet and outlet of the container, and opens at the low point in the compartment away from the liquid inlet and outlet of the container. Among them, in an ideal state, the high point of the opening can be at the highest point of the container cavity, so that when the liquid in the compartment is filled, there will not be too much residual gas locked in the compartment cavity, and the low point opening can be at the lowest point of the container cavity. When the liquid in this compartment is sucked and transferred to the compartment close to the liquid inlet and outlet, and there is no more liquid to be transferred, the height of the opening determines how much liquid will remain at the bottom of this compartment. The opening should be as flat as possible.

[0037] In the specific application of the oil-gas separation structure of the hydraulic accumulator, the liquid inlet and outlet of the container can be connected to the equipment that generates liquid injection and suction, such as being connected to the vehicle's hydraulic spring as an accumulator for the air spring, or being connected to a booster device and a test device as a high-pressure accumulator, or being used as a liquid recovery transfer device to collect the discharged liquid and suck it out by the booster device. The specific application is not limited to hydraulic springs, but can also be applied to shock absorbers. The liquid inlet and outlet of the container is connected to the vehicle's hydraulic spring and shock absorber, and the liquid inlet and outlet of the container is connected to the vehicle's hydraulic spring and shock absorber's compression rebound damping adjustment mechanism.

[0038] The oil-gas separation structure of the hydraulic accumulator of the present invention is applied to the hydraulic spring of the vehicle, and at least one hydraulic cylinder with a piston inside is connected to the container. The surge movement of the liquid into and out of the container is generated by the movement of the piston in the hydraulic cylinder. With the movement of the piston of the hydraulic spring, the gas will be almost completely transferred to the chamber far away from the liquid inlet and outlet of the container, while the liquid will be transferred to the chamber close to the liquid inlet and outlet of the container. In this way, the hydraulic energy storage container can reduce the dependence on the membrane or piston, and effectively separate the liquid and gas.

[0039] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for designing an oil-gas separation structure of a hydraulic accumulator, characterized in that: include: At least one container liquid inlet and outlet is designed on one side of the hydraulic energy storage closed container, and the inner cavity of the hydraulic energy storage closed container is designed to be a plurality of horizontally adjacent cabins, and at least one connecting cavity is arranged between each two cabins; each of the connecting cavities opens at a high point of the cabin wall in the cabin close to the container liquid inlet and outlet direction, and opens at a low point of the cabin wall in the cabin far from the container liquid inlet and outlet; The lowest edge of the high point opening of the cabin wall between two adjacent cabins is designed to be higher than the highest edge of the low point opening of the same connecting cavity, so that with the pulsation of the hydraulic energy storage closed container, the gas in the hydraulic energy storage closed container is transferred to the side away from the liquid inlet and outlet of the container, and the liquid is transferred to the liquid inlet and outlet side of the hydraulic energy storage closed container, and in the two adjacent chambers of the connecting cavity, the liquid level in the cabin on the low point opening side is higher than the highest edge of the low point opening, and the volume of the liquid in the raised part is greater than the volume of the connecting cavity corresponding to the low point opening, and the liquid level in the cabin on the high point opening side is lower than the lowest edge of the high point opening, and the volume from the lowest edge of the high point opening to the liquid level in the cabin is greater than the volume of the connecting cavity corresponding to the high point opening.

2. The method according to claim 1, characterized in that The number of chambers is determined according to the damping required by the hydraulic system.

3. The method according to claim 2, characterized in that The bumpier the environment in which the vehicle is used, the shorter the distance between the two side walls of the cabin should be designed; the more stable the environment in which the vehicle is used, the longer the distance between the two side walls of the cabin should be designed.

4. The method according to claim 1, characterized in that The size and proportions of each chamber, high point opening, and low point opening are determined through simulation.

5. The method according to claim 1, characterized in that The opening area is expanded horizontally through the upper and lower inner walls of the hydraulic energy storage closed container to increase the high point opening and the low point opening.

6. An oil-gas separation structure of a hydraulic accumulator, characterized in that: include: A hydraulic energy storage closed container, which is divided into multiple horizontally adjacent compartments by vertical partitions, and at least one connecting cavity is arranged between each two compartments; the connecting cavity opens at the high point of the partition in the compartment close to the liquid inlet and outlet of the container, and opens at the low point in the compartment far away from the liquid inlet and outlet of the container.

7. The oil-gas separation structure of the hydraulic accumulator according to claim 6, characterized in that: The oil-gas separation structure of the hydraulic accumulator is A method according to any one of claims 1 to 5.

8. The oil-gas separation structure of the hydraulic accumulator according to claim 6, characterized in that: The cavity is a pipeline or a sandwich between two adjacent cabins.

9. The oil-gas separation structure of the hydraulic accumulator according to claim 6, characterized in that: The opening is a flat opening.

10. A hydraulic spring using the oil-gas separation structure of the hydraulic accumulator according to any one of claims 6 to 9, characterized in that: include: The vehicle's hydraulic spring body and oil-gas separation structure, the container liquid inlet and outlet are connected to the vehicle's hydraulic spring.

11. The hydraulic spring as claimed in claim 11, characterized in that: The hydraulic energy storage closed container is installed horizontally under the automobile beam or in the middle of the beam.

12. A shock absorber using the oil-gas separation structure of the hydraulic accumulator according to any one of claims 6 to 9, characterized in that: include: The vehicle's shock absorber body and oil-gas separation structure, the container's liquid inlet and outlet are connected to the vehicle's shock absorber.

13. The shock absorber according to claim 12, characterized in that: include: The liquid inlet and outlet of the container are connected to the compression and rebound damping adjustment mechanism of the shock absorber of the vehicle.

Images