CN117553041A

CN117553041A - Accumulator, method for manufacturing the same, hydraulic suspension system and vehicle

Info

Publication number: CN117553041A
Application number: CN202311565639.XA
Authority: CN
Inventors: 吴波; 董开群; 王月
Original assignee: Anhui Weiyuan New Energy Technology Co ltd
Current assignee: Anhui Weiyuan New Energy Technology Co ltd
Priority date: 2023-11-22
Filing date: 2023-11-22
Publication date: 2024-02-13

Abstract

The invention discloses an energy accumulator, a manufacturing method thereof, a hydraulic suspension system and a vehicle. In addition, compared with a nonmetallic leather bag, the inflatable and sealed metal corrugated pipe is used, corrosion resistance and high and low temperature resistance of the energy accumulator are improved, inflation maintenance is omitted, and service life is prolonged.

Description

Accumulator, method for manufacturing the same, hydraulic suspension system and vehicle

Technical Field

The present application relates to the field of energy storage devices, and in particular to an energy storage device and a method for manufacturing the same, a hydraulic suspension system and a vehicle.

Background

An accumulator is a commonly used hydraulic energy storage device. The accumulator may be used to absorb pressure pulsations of a hydraulic system, such as a hydraulic pump, or may also be used to absorb hydraulic impact forces generated in the hydraulic system. The traditional accumulator adopts the rubber leather bag, the rubber leather bag has good ductility and is not easy to break when inflated, but the rubber leather bag has poor air tightness, easy air leakage and short service life, and needs to be replaced frequently.

The accumulator may comprise, for example, a cylinder and a bellows built into the cylinder. The internal space of the cylinder body is divided into an oil cavity and an air cavity by a corrugated pipe. When the accumulator is used, the bellows can extend and compress along with the charging and discharging of liquid. One typical accumulator is a bellows accumulator. It has large volume change and good effect of absorbing pressure pulsation. However, accumulators in the form of rubber bellows have a short service life.

It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The example of the application provides an energy accumulator, a manufacturing method thereof, a hydraulic suspension system and a vehicle, and designs a method for filling oil before filling gas, wherein the method can offset acting force of high-pressure gas to the inside of a metal corrugated pipe through incompressibility of oil when the high-pressure gas is filled into the metal corrugated pipe, and can avoid the metal corrugated pipe from being broken when the high-pressure gas is filled, so that the high-pressure gas is filled into the metal corrugated pipe, and the pressure bearing capacity of the energy accumulator is improved.

The scheme exemplified by the application is implemented as follows.

In a first aspect, examples of the present application provide a method of manufacturing an accumulator, comprising:

providing a shell and a metal telescopic piece which is formed by extending from a first end to a second end along the axial direction, wherein the shell is provided with an inner cavity defined by a shell wall, a fluid inlet and a fluid outlet are formed in the shell wall, the metal telescopic piece is provided with a pipe wall and a pipe cavity defined by the pipe wall and used for filling and preserving gas, and the first end is provided with a gas inlet and a gas outlet;

placing the metal telescoping member in the interior cavity such that a gap is formed between the tube wall and the shell wall;

fixedly connecting the first end with the shell wall and enabling the second end to be movably matched with the shell wall, so that the fluid inlet and outlet are selectively closed or exposed through the expansion and contraction of the metal expansion and contraction piece along the axial direction;

after the gap is filled with oil through the fluid inlet and outlet, gas is filled into the pipe cavity through the gas inlet and outlet, and the gas inlet and outlet is sealed to finish manufacturing of the energy accumulator.

According to some examples of the application, the metal expansion piece comprises a metal corrugated pipe, and a front flange and a rear flange for closing two ends of the metal corrugated pipe;

optionally, the metal expansion piece fills and stores gas into the lumen through the gas inlet and outlet on the rear flange;

optionally, the metal telescopic piece is movably matched with the shell wall through the front flange;

optionally, after filling the gap with oil, and before filling the lumen with gas, the fluid inlet and outlet are closed.

According to some examples of the present application, the metal bellows is a single layer metal bellows;

or, the metal corrugated pipe is a double-layer metal corrugated pipe, wherein the double-layer metal corrugated pipe is provided with an inner pipe wall and an outer pipe wall wrapping the inner pipe wall, an interlayer cavity is formed between the inner pipe wall and the outer pipe wall, the double-layer metal corrugated pipe is provided with a heat exchange medium runner communicated with the interlayer cavity, the inner pipe wall is provided with a pipe cavity for filling gas, and before the pipe cavity is inflated, heat exchange medium is injected into the interlayer cavity to balance the pressure at two sides of the inner pipe wall.

According to some examples of the present application, the gap is filled with oil by:

applying pressure to the front flange by using a tool to compress the metal bellows until a gap is formed between the front flange and the shell wall;

communicating the through hole on the tool with the gap through the gap, and pumping out air in the gap;

and filling liquid into the shell through a liquid supply system until the gap is filled with oil.

According to some examples of the present application, the gas that is inflated into the lumen comprises a mixture of air and a medium, the medium being a gas having a compression ratio less than air;

optionally, the medium comprises helium and/or nitrogen.

According to some examples of the present application, the compressibility of the gas mixture is related to the volume of oil within the gap.

According to some examples of the present application, the volume ratio of the air to the medium is 1:80.

In a second aspect, examples of the present application provide an accumulator prepared using the method of manufacturing an accumulator as set forth in any one of the above-described features.

In a third aspect, examples of the present application provide a hydraulic suspension system comprising an accumulator as described in the above description of the features.

In a fourth aspect, examples of the present application provide a vehicle comprising an accumulator as described in the above-mentioned characterization or comprising a hydraulic suspension system as described in the above-mentioned characterization.

The beneficial effects are that:

compared with the prior art, the scheme of this application fills fluid earlier and inflates again, utilizes the incompressibility of fluid, makes the inside and outside pressure of the pipe wall of metal expansion piece balanced at the in-process of filling high-pressure gas, has reduced the probability that the pipe wall of metal expansion piece rises broken. In addition, compared with a nonmetallic leather bag, the inflatable and sealed metal telescopic part is used, so that the corrosion resistance and the high and low temperature resistance of the energy accumulator are improved, the inflation maintenance is avoided, and the service life is prolonged.

Drawings

For a clearer description, the drawings that are required to be used in the description will be briefly introduced below.

FIG. 1 is a flow chart of a method of manufacturing an accumulator in an example of the present application;

FIG. 2 is a schematic cross-sectional structural view of a housing in an accumulator in an example of the present application;

FIG. 3 is a schematic structural view of a metal bellows in an accumulator exemplified herein;

FIG. 4 depicts a schematic cross-sectional view of a metal bellows in an accumulator in a first state;

FIG. 5 shows a schematic cross-sectional view of a metal bellows in an accumulator in a second state;

reference numerals illustrate: 100-a housing; 101-fluid inlet and outlet; 102-shell wall; 103-an internal cavity; 104-notch; 200-metal corrugated pipe; 201-a first end; 202-a second end; 203-front flange, 204-gas inlet and outlet, 205-rear flange, 300-gap, 400-fixture, 401-ejector rod, 402-through hole and 500-gap.

Detailed Description

Specific embodiments of the present invention will be described in more detail below with reference to the drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

An accumulator is a hydraulic energy storage device that is frequently used in a variety of power plants and devices. For example, in order to make the operation of an automobile or a work machine smoother, an accumulator may be used in such machines as hydraulic systems to absorb or dampen momentary shocks, vibrations, etc.

In general, the accumulator may be provided with a gas chamber and a liquid chamber, respectively. To the best of the inventors' knowledge, many accumulators currently use rubber bladders (bellows) as a gas and liquid barrier. Wherein a gas such as nitrogen with a certain pressure is pre-flushed in the leather bag. Therefore, when hydraulic impact enters the energy accumulator, nitrogen in the leather bag under the action of pressure is compressed, so that impact energy is absorbed, and the purpose of shock absorption is achieved. But the service life of the bellows accumulator is short. Compared with rubber leather bags, the metal corrugated pipe has the advantages of good air tightness and long service life.

However, the inventor further found that after the accumulator is connected to the hydraulic system, the inner part of the metal corrugated pipe is subjected to the pressure of gas, and the outer part of the metal corrugated pipe is subjected to the pressure of liquid; because the pressure of the liquid is unstable, the situation of unbalanced pressure bearing on the inner side and the outer side of the metal corrugated pipe can occur, so that scientific researchers usually focus on balancing the pressure inside and outside the metal corrugated pipe after the accumulator is connected into a hydraulic system, but the pressure bearing capacity of the accumulator cannot be fundamentally improved. In order to solve the problem, in the embodiment of the application, a method of filling oil before filling is designed, the method can offset acting force of high-pressure gas to the inside of the metal corrugated pipe through incompressibility of oil when the high-pressure gas is filled into the metal corrugated pipe, and can avoid the metal corrugated pipe from being broken when the high-pressure gas is filled, so that the high-pressure gas is filled into the metal corrugated pipe, and the scheme improves the pressure bearing capacity of the energy accumulator.

Specifically, referring to fig. 1-5, an embodiment of the present application provides a method for manufacturing an energy accumulator, including:

s100: providing a housing 100 and a metal telescopic member extending axially from a first end 201 to a second end 202, wherein the housing 100 is provided with an inner cavity 103 defined by a housing wall 102, a fluid inlet 101 is formed on the housing wall 102, the metal telescopic member is provided with a pipe wall and a pipe cavity defined by the pipe wall and used for filling and preserving gas, and the first end 201 is provided with a gas inlet 204;

s200: placing the metal telescoping member in the interior cavity 103 such that a gap 300 is formed between the tube wall and the shell wall 102;

s300: fixedly connecting said first end 201 to said housing wall 102 and removably engaging said second end 202 with said housing wall 102 to selectively close or expose said fluid inlet 101 by telescoping said metal telescoping member in said axial direction;

s400: after the gap 300 is filled with oil through the fluid inlet and outlet 101, gas is filled into the lumen through the gas inlet and outlet 204, and the gas inlet and outlet 204 is sealed to complete the manufacture of the accumulator.

The scheme that this application embodiment provided fills fluid earlier and aerifys with prior art is different, utilizes the incompressibility of fluid, makes the inside and outside pressure of the pipe wall of metal expansion piece balanced in the in-process of filling high-pressure gas, has reduced the probability that the pipe wall of metal expansion piece rises broken. In addition, compared with a nonmetallic leather bag, the inflatable and sealed metal telescopic part is used, so that the corrosion resistance and the high and low temperature resistance of the energy accumulator are improved, the inflation maintenance is avoided, and the service life is prolonged.

It should be noted that in the example, the housing 100 is generally configured in a columnar structure. In the configuration shown in fig. 2, the housing 100 has two parts of a unitary structure and is in the shape of two generally hollow cylinders, respectively (the hollow cavities of the two communicating). The two cylinders have collinear axes, with a small diameter cylinder extending from the end of a large diameter cylinder. Furthermore, the two cylinders have different diameters, wherein the large diameter portion is used to accommodate the metal bellows and the small diameter portion is used to connect with external equipment.

As the name implies, the housing 100 has a space to accommodate components; thus, the housing 100 has a housing wall 102, and an interior cavity 103 defined by the housing wall 102. Further, the housing wall 102 is also provided with a fluid inlet 101 communicating with the internal cavity 103. Corresponding to the case where the housing 100 has two cylinders, the internal cavity 103 may be in a large diameter portion, and the fluid inlet and outlet 101 in a small diameter portion; the two are communicated at the boundary of the large diameter part and the small diameter part.

The fluid inlet/outlet 101 can be used as an inlet/outlet for an external impact force transmission substance (such as liquid) to enter the accumulator and act on the passage of the metal expansion/contraction member. Thus, in use of the accumulator, the accumulator may be connected to a liquid system of an external device (e.g. an automobile, a construction machine, an industrial robot, etc.) by means of a component or structure providing the fluid inlet 101.

In addition to having the fluid port 101 described above, the housing 100 may have another opening or passage. This opening or channel may be configured based on ease of assembly of the metal telescoping pieces. And in an already manufactured accumulator, the further opening or channel may be closed by a metal bellows (or an accessory part thereof; as mentioned later on the rear flange 205) to avoid leakage of fluid generated by the liquid system of the aforementioned external device from such opening or channel.

Referring to fig. 3, similar to the housing 100, the metal telescoping member is also of a generally cylindrical tubular configuration. And for convenience of description may be defined that the metal telescoping member is axially extended from a first end 201 to a second end 202. And when installed in the housing 100, the metal telescoping member is capable of being forced to compress/shorten in the direction from the second end 202 to the first end 201 (i.e., axially) and expand/elongate in the opposite direction when the force is partially or completely removed.

Further, the metal telescoping member also has a tube wall and a lumen defined by the tube wall. Wherein the lumen can be used to inflate and conserve gas. After the accumulator is manufactured, gas is trapped within the metal bellows and the metal bellows is inflated. When the metal expansion piece is extruded by external force to shrink, the gas is compressed (volume is reduced and heat is generated) under the action of the pipe wall. After the external force is removed, the gas expands and causes the tube wall to expand.

In order to absorb/buffer external forces, the accumulator takes advantage of the telescopic movement of the metal telescopic member to oppose the external forces. Therefore, stable telescoping of the metal telescoping member would be beneficial. Based on this, the first end 201 of the metal bellows is firmly connected with the wall 102 of the housing 100; the connection is, for example, a welded, fixed connection or a screwed, detachable connection.

The first end 201 of the metal extension piece may be connected to the housing 100 in a corresponding different manner, depending on the implementation of the housing 100. For example, when the interior cavity 103 of the housing 100 is not through the wall 102 thereof, the first end 201 may be connected to the wall 102. Alternatively, when the interior cavity 103 of the housing 100 is through the wall 102 thereof, the wall 102 may define a gap 104 in communication with the interior cavity 103, and then the first end 201 may be coupled to the wall 102 and close the gap 104.

Specifically, in this embodiment, the metal expansion member includes a metal bellows 200, and a front flange 203 and a rear flange 205 closing both ends of the metal bellows 200;

specifically, in the present embodiment, the metal expansion member is filled into the lumen through the gas inlet and outlet 204 on the rear flange 205 and holds the gas, and the metal expansion member is movably engaged with the housing wall 102 through the front flange 203.

In the example shown in fig. 3, the metal bellows 200 is single-walled, and thus may also be referred to as a single-layered metal bellows 200. In such an example, in an apparatus using the accumulator, the cooling oil is injected from the liquid supply system into the gap 300 and prevented from entering the impulse-generating pressure system. Therefore, the injection timing of the liquid is accurately determined. For such a need, a sensor may be configured in the accumulator. A sensor may be used to detect whether the second end 202 of the bellows seals off the fluid port 101. And the filling or discharging of the liquid can be adjusted correspondingly by the blocking state of the fluid inlet 101 determined by the sensor.

In some alternative examples, the sensor may be a direct detection type sensor, or may also be an indirect detection type sensor; both types of sensors may be used in combination. Wherein the direct detection type sensor is for example a pressure sensor (or contact sensor). Thus, the pressure sensor is used to detect whether the second end 202 of the bellows is in contact with the housing wall 102. The indirect detection type sensor is, for example, a barometric pressure sensor. Thus, the air pressure sensor is used to detect whether the second end 202 of the bellows is in contact with the housing wall 102.

In this way, when the sensor is used, the fluid inlet/outlet 101 is in a normal pressure state (an air pressure sensor is provided and indirect detection is performed). In this state, the front flange 203 is against the housing 100 (a pressure sensor is provided, and direct detection is performed), the gas port is blocked by the front flange 203, the oil port is in a smooth state, the oil is filled into the gap 300, and the oil is discharged after heat exchange with the bellows. Before the corrugated pipe is compressed each time, the cavity between the corrugated pipe and the shell 100 is filled with oil, and the oil can be discharged through a heat exchange medium channel (oil hole), so that heat of the corrugated pipe is taken away in time.

In other examples of the present application, a metal bellows 200 having two walls may also be designed so that a double layer metal bellows may be described. The metal bellows 200 is a double-layer metal bellows, wherein the double-layer metal bellows is provided with an inner pipe wall and an outer pipe wall wrapping the inner pipe wall, an interlayer cavity is formed between the inner pipe wall and the outer pipe wall, the double-layer metal bellows is provided with a heat exchange medium runner communicated with the interlayer cavity, and the inner pipe wall is provided with a pipe cavity for filling gas.

In actual use, the inner wall cavity of the double-layer metal corrugated pipe is filled with gas such as nitrogen, so that the double-layer metal corrugated pipe can buffer the impact action of the outside through self-contraction (gas compression) and recover to an expanded state when the subsequent impact action is eliminated.

It should be noted that when we choose a double-layer metal bellows, a heat exchange medium is injected into the interlayer cavity to balance the pressure on both sides of the inner pipe wall before the cavity is inflated, where the heat exchange medium may be oil, and the present invention is not limited thereto.

In step S400, the oil is filled first and then inflated, so that the internal and external pressures of the pipe wall of the metal corrugated pipe 200 are balanced in the process of filling high-pressure gas by utilizing the incompressibility of the oil, and the pipe wall expansion probability of the metal corrugated pipe 200 is reduced. Compared with a nonmetallic leather bag, the metal corrugated pipe 200 sealed and welded after inflation is used, so that the corrosion resistance and the high and low temperature resistance of the energy accumulator are improved, inflation maintenance is omitted, and the service life is prolonged. After stopping the filling, under the action of the uninflated metal bellows 200, the front flange 203 is attached to the shell wall 102 to seal the fluid inlet 101 for filling the oil, so that the gap 300 between the metal bellows 200 and the shell 100 is closed. The incompressibility of the gap-closing oil-filling liquid enables the balance degree of the inner pressure and the outer pressure of the pipe wall of the metal corrugated pipe 200 to reach the optimal state when the step 400 is inflated.

It should be noted that, before the oil is filled, the fluid inlet and outlet may be exposed in various ways, and in this embodiment, two examples are listed, where the first scheme is as follows: when the metal corrugated pipe is under the original length effect, the fluid inlet and outlet can be exposed, and the scheme only enables the metal corrugated pipe to stretch and close the fluid inlet and outlet after the metal corrugated pipe is inflated. During the aeration process, the volume of the space in which the oil is located is continuously reduced along with the extension of the metal corrugated pipe. As will be appreciated by those skilled in the art, in the first solution, the metal bellows is not long enough to cover the fluid inlet and outlet without being disturbed by any external force. In the case of the metal bellows shown in fig. 4, which is briefly described by referring to fig. 4 as a comparison, the fluid inlet and outlet may be covered by the front flange when the bellows is in a naturally extended or compressed state, but in the first solution mentioned in this embodiment, the front flange does not contact the shell wall, i.e. there is a gap space between the front flange and the shell wall, so that the fluid inlet and outlet is not closed.

The second scheme is as follows: at the position ofBefore not charging, before not charging oilThe metal bellows is in a natural extended or compressed state (preferably a compressed state) to close the fluid inlet and outlet. The external acting force applied by the tool further compresses the metal corrugated pipe to expose the fluid inlet and outlet. The second scheme has the advantages that: 1. the fluid inlet and outlet can be closed after the external acting force is removed and before the oil is filled; 2. at the position ofDuring the inflation processThe volume of the metal bellows can be changed in a negligible way, so that the volume of the space where the oil is located is stable.

In this embodiment, the fluid inlet and outlet are preferably closed after the gap is filled with oil and before the lumen is filled with gas. Since the oil has incompressibility, a stable oil space can be realized.

Referring to fig. 4 and fig. 5, in some examples, a tool 400 may be used to apply pressure to the front flange 203, which is specifically shown as compressing the metal bellows 200 by using a mandrel 401 of the tool 400 until a gap 500 is formed between the front flange 203 and the first sidewall, a through hole 402 on the tool 400 is communicated with the gap 300 through the gap 500, and referring to fig. 5, a hole is formed on a sidewall of the mandrel 401 in fig. 5, the through hole 402 on the tool 400 is communicated with the gap 300 through the hole and the gap 500, air in the gap 300 is firstly pumped out, and then oil is filled into the housing 100 through a liquid supply system, so as to ensure that the gap 300 is filled with the oil. In the present embodiment, fig. 4 is a schematic structural view showing a cross section of the metal bellows in the accumulator in the first state, and fig. 5 is a schematic structural view showing a cross section of the metal bellows in the accumulator in the second state. It should be noted that the first state may refer to a state of the metal bellows before inflation or during assembly, and the second state may refer to a state of the metal bellows after the oil filling process or the oil has been filled.

According to some examples of the present application, the gap 300 is filled with oil by:

applying pressure to the front flange 203 using the tool 400 to compress the metal bellows 200 until a gap 500 is formed between the front flange 203 and the shell wall 102;

communicating a through hole 402 on the tooling 400 with the gap 300 through the gap 500, and pumping out air in the gap 300;

the interior of the housing 100 is filled with liquid by a liquid supply system until the gap 300 is filled with oil.

In the above method, in step 400, the gas is a mixed gas formed by mixing air and a medium. By medium is meant a gas having a compressibility less than that of air, which in this embodiment includes, but is not limited to, helium, nitrogen, thereby enhancing the energy absorbing capacity of the accumulator as a whole. In some alternative examples, air may be combined with pure nitrogen in a volume ratio of 1:80, mixing, the purity of the mixed gas reaches 99.95%, the compression ratio of the metal corrugated pipe 200 can reach 50%, the compression ratio of the mixed gas is related to the absorption energy (namely the volume of oil entering the shell 100), specifically, the compression ratio of the mixed gas is in positive correlation with the volume of oil in a gap, the pressure of the gas, namely the pressure bearing of an accumulator, reaches 16Mpa (belonging to high pressure), and the pressure point stability can be realized at the temperature above 196 ℃ below zero, wherein the pressure point stability can be kept because the purity of the gas is improved, and the smaller the content of water vapor, the smaller the air pressure loss at low temperature. In addition to this example, helium can be used as the medium, which ensures that the accumulator is pressure point stable at temperatures above-268 ℃. On the other hand, the material of the metal bellows 200 is metal, so that the accumulator has high temperature resistance.

It will be understood by those skilled in the art that the tool mentioned in this embodiment refers to a device for fixing a certain workpiece at a specified position, and maintaining its relative position during processing, detecting, assembling, etc., and will not be described in detail herein.

In the structure, the liquid provided by the liquid supply system is oil in the hydraulic suspension system, and the oil interface is connected with the hydraulic suspension system, so that the vehicle can run under the condition of road bump, and the damage to a pump in the hydraulic suspension system can be reduced. In addition, the liquid for balancing the internal and external pressure of the pipe wall of the metal corrugated pipe 200 is oil in a hydraulic suspension system, and no impurity is introduced.

In a second aspect, embodiments of the present application further provide an energy storage device, based on the method for manufacturing an energy storage device described above, manufactured by using the method for manufacturing an energy storage device described in any of the foregoing features.

In a third aspect, on the basis of the above-mentioned energy accumulator, embodiments of the present application propose a hydraulic suspension system comprising an energy accumulator as described in the above-mentioned characterization.

In a fourth aspect, embodiments of the present application also provide a vehicle comprising an accumulator as described in the above-mentioned characterization, or comprising a hydraulic suspension system as described in the above-mentioned characterization.

In the description of the present specification, a description of the terms "one embodiment," "some embodiments," "examples," or "particular examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the invention without departing from the scope of the technical solution of the invention, and the technical solution of the invention is not departing from the scope of the invention.

Claims

1. A method of manufacturing an accumulator, comprising:

2. The method of manufacturing an accumulator according to claim 1, wherein the metal extension includes a metal bellows and front and rear flanges closing both ends of the metal bellows;

3. The method of manufacturing an accumulator according to claim 2, characterized in that the metal bellows is a single-layer metal bellows;

4. The method of manufacturing an accumulator according to claim 2, characterized in that the gap is filled with oil by:

5. The method of manufacturing an accumulator according to claim 1, wherein the gas charged into the lumen includes a mixed gas of air and a medium, the medium being a gas having a compression ratio smaller than that of air;

optionally, the medium comprises helium and/or nitrogen.

6. The method of manufacturing an accumulator according to claim 5, characterized in that the compression ratio of the mixed gas is related to the volume of oil in the gap.

7. The method of claim 5, wherein the volume ratio of air to medium is 1:80.

8. An accumulator prepared by the method of manufacturing an accumulator according to any one of claims 1-7.

9. A hydraulic suspension system comprising the accumulator of claim 8.

10. A vehicle comprising an accumulator as claimed in claim 8 or a hydraulic suspension system as claimed in claim 9.