Two-stage accumulator

Abstract

The application discloses a two-stage energy accumulator, which comprises an oil cylinder, wherein a first piston and a second piston are sequentially arranged in the oil cylinder from bottom to top; the inside of the oil cylinder is divided into a first oil cavity, a second oil cavity and a containing cavity from bottom to top; the first oil cavity and the second oil cavity are respectively and discontinuously connected with an oil line; the second oil cavity and the containing cavity are respectively provided with a first energy storage spring and a second energy storage spring; and the top of the oil cylinder is provided with a position adjusting bolt; when the first oil cavity is connected with the oil line and the second oil cavity is disconnected with the oil line, the bottom of the position adjusting bolt is in abutment with the top of the second piston; when the first oil cavity is disconnected with the oil line and the second oil cavity is connected with the oil line, the position adjusting bolt is screwed to the top of the containing cavity, and the position adjusting bolt is separated from the second piston. The application solves the technical problems of poor high-pressure resistance, stability and safety of the energy accumulator.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power supply, further relates to an energy accumulator, in particular to a two-stage energy accumulator applied to high-pressure oil system of power plant. BACKGROUND

[0002] The energy accumulator is an energy storage device in hydraulic pneumatic system. It converts the energy in the system into compressed energy or potential energy at the appropriate time, and when the system needs it, it converts the compressed energy or potential energy into hydraulic energy or gas pressure energy to release and supply the system again. When the system pressure increases instantaneously, it can absorb part of the energy to ensure the normal pressure of the whole system.

[0003] At present, the high-pressure oil system of power plant adopts bladder accumulator for energy storage, but it has the following shortcomings and deficiencies:

[0004] 1. The bladder accumulator is prone to burst failure when the oil pressure is too high, and the medium oil is prone to leakage after the bladder bursts. In addition, the bladder of the bladder accumulator is prone to aging during long-term use, which seriously affects the stability and safety of the system.

[0005] 2. The bladder accumulator has a large volume and needs a large space for placement, which is inconvenient to maintain and has high maintenance cost.

[0006] 3. The bladder accumulator cannot realize pressure tracking due to its own material (i.e. the bladder), and cannot know whether the accumulator itself is in a damaged state.

[0007] Therefore, the present application provides a two-stage energy accumulator to overcome the defects of the prior art. SUMMARY

[0008] The present application aims to provide a two-stage energy accumulator with two-stage pressure capacity, which realizes the function of one for use and one for standby, has stronger pressure capacity, and will not be damaged even if overpressure occurs, greatly increasing the reliability and safety of the system, and having small volume, long service life, facilitating maintenance and repair of workers, effectively reducing the labor intensity and maintenance cost of workers.

[0009] The object of the present application can be achieved by using the following technical solutions:

[0010] The application provides a two-stage energy accumulator, which comprises an oil cylinder, the inside of the oil cylinder is sequentially provided with a first piston and a second piston from bottom to top, so as to divide the inside of the oil cylinder into a first oil cavity, a second oil cavity and a containing cavity from bottom to top, the first oil cavity and the second oil cavity are respectively and discontinuously connected with an oil circuit pipeline, the second oil cavity and the containing cavity are respectively provided with a first energy storage spring and a second energy storage spring, and the top of the oil cylinder is provided with a position adjusting bolt.

[0011] When the first oil cavity is communicated with the oil circuit pipeline and the second oil cavity is disconnected with the oil circuit pipeline, the bottom of the position adjusting bolt extends into the containing cavity and abuts against the top of the second piston.

[0012] When the first oil cavity is disconnected with the oil circuit pipeline and the second oil cavity is communicated with the oil circuit pipeline, the position adjusting bolt is screwed to the top of the containing cavity by moving the bottom of the position adjusting bolt upward, and the position adjusting bolt is separated from the second piston.

[0013] In a preferred embodiment of the application, the first piston and the second piston are movably arranged in the inside of the oil cylinder, and the first piston is sequentially sleeved with a first sealing ring and a second sealing ring from bottom to top, which seal the first oil cavity and the second oil cavity, and the second piston is sequentially sleeved with a third sealing ring and a fourth sealing ring from bottom to top, which seal the second oil cavity and the containing cavity.

[0014] In a preferred embodiment of the application, the outer wall of the oil cylinder is provided with a position tracking device for displaying the moving position of the first piston.

[0015] The position tracking device comprises a sliding rail and a magnetic block capable of generating an attractive force with the first piston, the magnetic block is provided with a pulley, the sliding rail is arranged on the outer wall of the oil cylinder along the moving direction of the first piston, and the pulley is slidably arranged on the sliding rail, so that the magnetic block can move along the sliding rail.

[0016] In a preferred embodiment of the application, the top of the second piston is provided with a positioning groove opposite to the position adjusting bolt, and the bottom of the position adjusting bolt extends into the positioning groove.

[0017] In a preferred embodiment of the application, the two-stage energy accumulator further comprises a position adjusting rod arranged in the vertical direction, the position adjusting bolt is provided with an inner channel penetrating the position adjusting bolt along the axial direction of the position adjusting bolt, the top of the position adjusting rod is located above the position adjusting bolt, the position adjusting rod is inserted into the inner channel, and the bottom of the position adjusting rod extends to the bottom of the position adjusting bolt.

[0018] The bottom side wall of the position adjusting bolt is provided with a plurality of positioning through holes in communication with the inner channel, the inner part of the positioning groove is provided with a plurality of first clamping grooves at positions corresponding to the positioning through holes, the bottom outer wall of the position adjusting rod is provided with an annular second clamping groove along the circumference of the position adjusting rod, a plurality of balls are arranged in the inner channel and above the second clamping groove, each ball is clamped between the outer wall of the position adjusting rod and the corresponding positioning through hole, and one side surface of each ball penetrates through the corresponding positioning through hole and is embedded in the corresponding first clamping groove, so as to position the position adjusting bolt and the second piston.

[0019] The position adjusting rod is lifted, each ball rolls into the second clamping groove in the inner channel, each ball is separated from the corresponding first clamping groove, the position adjusting bolt is screwed to the top of the accommodating cavity, and the second piston can move up and down.

[0020] In a preferred embodiment of the present application, the top outer wall of the oil cylinder is provided with a first flange, the top of the oil cylinder is provided with an opening in communication with the accommodating cavity, a second flange is arranged above the opening, and a plurality of fastening bolts are connected between the first flange and the second flange to block the opening.

[0021] In a preferred embodiment of the present application, the position adjusting bolt is located at the middle position of the opening, the position adjusting bolt penetrates through the second flange and extends into the accommodating cavity, and the position adjusting bolt is threadedly connected with the second flange.

[0022] In a preferred embodiment of the present application, the oil passage pipeline and the oil cylinder are provided with an oil delivery main pipe, a first oil delivery branch pipe and a second oil delivery branch pipe, one end of the oil delivery main pipe is in communication with the inner part of the oil passage pipeline, the other end of the oil delivery main pipe is connected with one end of the first oil delivery branch pipe and one end of the second oil delivery branch pipe respectively, the other end of the first oil delivery branch pipe is in communication with the first oil cavity, and the other end of the second oil delivery branch pipe is in communication with the second oil cavity.

[0023] The first oil delivery branch pipe and the second oil delivery branch pipe are respectively provided with a first valve and a second valve.

[0024] In a preferred embodiment of the present application, the first oil delivery branch pipe is in communication with the bottom of the first oil cavity, and the second oil delivery branch pipe is in communication with the top of the second oil cavity.

[0025] In a preferred embodiment of the present application, a limiting block is arranged on the inner wall of the oil cylinder and above the position where the oil cylinder is connected with the second oil liquid conveying branch pipe, and the second piston can be moved downward to a position where the bottom of the second piston abuts against the top of the limiting block, so as to limit the downward position of the second piston.

[0026] As described above, the two-section accumulator of the present application has the following features and advantages: the two-section accumulator of the present application has simple structure and is convenient to operate, and has small floor area. The first piston and the second piston are arranged in the oil cylinder, and the inside of the oil cylinder is divided into the first oil cavity, the second oil cavity and the accommodating cavity from bottom to top by the first piston and the second piston. The first piston, the second piston, the first oil cavity, the second oil cavity and the accommodating cavity cooperate to form the two-section pressure containing structure of the present application. In the normal working state, the second piston is fixed by the position adjusting bolt, and only the first piston, the first energy storage spring and the first oil cavity cooperate to play the role of energy storage and pressure regulation. After the first piston is damaged, the first oil cavity and the second oil cavity are connected, the position adjusting bolt is separated from the second piston, and the second piston is in a freely movable state. At this time, the second piston, the second energy storage spring and the connected first oil cavity and second oil cavity cooperate to play the role of energy storage and pressure regulation. At this time, the accumulator can withstand greater oil pressure, so that the accumulator has stronger pressure bearing capacity, and there is no need to worry about the occurrence of phenomena such as burst failure of the accumulator and leakage of medium oil, greatly increasing the reliability and safety of the system, long service life, facilitating maintenance and repair of workers, effectively reducing the labor intensity and maintenance cost of workers, and being suitable for popularization and use. BRIEF DESCRIPTION OF DRAWINGS

[0027] The following drawings are only intended to illustrate and explain the present application and do not limit the scope of the present application.

[0028] Among them:

[0029] Figure 1 : is a structure schematic view of the two-section accumulator of the present application.

[0030] Figure 2 : is a structure schematic view of the position adjusting rod in the two-section accumulator of the present application.

[0031] Figure 3 : is a structure schematic view of the position adjusting bolt in the two-section accumulator of the present application.

[0032] Figure 4 : is a structure schematic view of the position adjusting bolt and the second piston in the connected state in the two-section accumulator of the present application.

[0033] Figure 5 : is a structure schematic view of the position adjusting bolt and the second piston in the separated state in the two-section accumulator of the present application.

[0034] The reference signs in the present application are as follows:

[0035] 1. oil cylinder; 101. first oil cavity;

[0036] 102. second oil cavity; 103. accommodating cavity;

[0037] 2. first piston; 201. first sealing ring;

[0038] 202. second sealing ring; 3. second piston;

[0039] 301. third sealing ring; 302. fourth sealing ring;

[0040] 303. positioning groove; 3031. first clamping groove;

[0041] 4. first energy storage spring; 5. second energy storage spring;

[0042] 6. position adjusting bolt; 601. inner channel;

[0043] 602. positioning through hole; 7. position adjusting rod;

[0044] 701. second clamping groove; 8. limiting block;

[0045] 9. position tracking device; 10. first flange;

[0046] 11. second flange; 12. fastening bolt;

[0047] 13. oil liquid delivery main pipe; 14. first oil liquid delivery branch pipe;

[0048] 15. second oil liquid delivery branch pipe; 16. first valve;

[0049] 17. second valve; 18. oil way pipeline;

[0050] 19. ball. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0052] As Figures 1 to 3As shown, the application provides a two-stage accumulator, which comprises an oil cylinder 1 in a cylindrical structure with both ends sealed and arranged in a vertical direction, a first piston 2 and a second piston 3 arranged in the oil cylinder 1 from bottom to top, the inside of the oil cylinder 1 is sequentially divided into a first oil cavity 101, a second oil cavity 102 and a containing cavity 103 by the first piston 2 and the second piston 3, the first oil cavity 101 and the second oil cavity 102 are respectively connected to an oil line pipe 18 in an on-off manner, the first oil cavity 101 is provided with a first energy storage spring 4, the containing cavity 103 is provided with a second energy storage spring 5, and a position adjusting bolt 6 is arranged at the top of the oil cylinder 1; when the first piston 2 can be normally used, the first oil cavity 101 is controlled to be communicated with the oil line pipe 18, the second oil cavity 102 is controlled to be disconnected with the oil line pipe 18, the bottom of the position adjusting bolt 6 extends into the containing cavity 103 and abuts against the top of the second piston 3, at this time only the first piston 2 can move up and down, the two-stage accumulator cooperates with the first piston 2, the first energy storage spring 4 and the first oil cavity 101 to play the role of energy storage and pressure regulation; when the first piston 2 is damaged and the first oil cavity 101 is communicated with the second oil cavity 102, the first oil cavity 101 is controlled to be disconnected with the oil line pipe 18, the second oil cavity 102 is controlled to be communicated with the oil line pipe 18, the position adjusting bolt 6 is screwed to the top of the containing cavity 103, the position adjusting bolt 6 is separated from the second piston 3, at this time the second piston 3 can move up and down, the two-stage accumulator cooperates with the second piston 3, the second energy storage spring 5 and the communicated first oil cavity 101 and second oil cavity 102 to play the role of energy storage and pressure regulation, and the normal use of the accumulator is ensured.

[0053] The application divides the inside of the oil cylinder 1 from bottom to top into the first oil cavity 101, the second oil cavity 102 and the containing cavity 103 by the first piston 2 and the second piston 3, and the first piston 2, the second piston 3, the first oil cavity 101, the second oil cavity 102 and the containing cavity 103 cooperate to form the two-section type pressure containing structure of the application.

[0054] In an optional embodiment of the application, as shown in Figure 1 The first piston 2 is in a cylindrical structure, is movably arranged in the inside of the oil cylinder 1, and has the first sealing ring 201 and the second sealing ring 202 which are sequentially sleeved on the first piston 2 from bottom to top and seal the first oil cavity 101 and the second oil cavity 102, the inner wall of the first sealing ring 201 and the inner wall of the second sealing ring 202 are tightly combined with the outer wall of the first piston 2, and the outer wall of the first sealing ring 201 and the outer wall of the second sealing ring 202 are tightly combined with the inner wall of the oil cylinder 1, two-stage high-pressure oil seals are formed by the first sealing ring 201 and the second sealing ring 202 to ensure the good sealing between the first piston 2 and the inner wall of the oil cylinder 1.

[0055] In an optional embodiment of the application, as shown in Figure 1 The second piston 3 is in a cylindrical structure, is movably arranged in the inside of the oil cylinder 1, and has the third sealing ring 301 and the fourth sealing ring 302 which are sequentially sleeved on the second piston 3 from bottom to top and seal the second oil cavity 102 and the containing cavity 103, the inner wall of the third sealing ring 301 and the inner wall of the fourth sealing ring 302 are tightly combined with the outer wall of the second piston 3, and the outer wall of the third sealing ring 301 and the outer wall of the fourth sealing ring 302 are tightly combined with the inner wall of the oil cylinder 1, two-stage high-pressure oil seals are formed by the third sealing ring 301 and the fourth sealing ring 302 to ensure the good sealing between the second piston 3 and the inner wall of the oil cylinder 1.

[0056] Further, the first sealing ring 201, the second sealing ring 202, the third sealing ring 301 and the fourth sealing ring 302 are all made of rubber, so that high-pressure rubber skeleton oil seals are formed between the first oil cavity 101, the second oil cavity 102 and the accommodating cavity 103.

[0057] In an optional embodiment of the present application, as shown in Figure 1 The outer wall of the oil cylinder 1 is provided with a position tracking device 9 for displaying the moving position of the first piston 2. The position tracking device 9 comprises a sliding rail and a magnetic block capable of generating an attractive force with the first piston 2. The magnetic block is provided with a pulley. The sliding rail is arranged on the outer wall of the oil cylinder 1 along the moving direction of the first piston 2. The pulley is slidably arranged on the sliding rail, so that the magnetic block can move up and down along the sliding rail. During the movement of the first piston 2, the magnetic block moves synchronously with the first piston 2. The position of the magnetic block can be observed to obtain the position of the first piston 2 in the oil cylinder 1, so as to understand the energy storage condition in the oil cylinder 1.

[0058] Further, the magnetic block is made of a magnet. The first piston 2 is made of a steel material capable of generating an attractive force with the magnet. The oil cylinder 1 is made of stainless steel which does not attract the magnet or is subjected to a demagnetization treatment (a demagnetization layer is arranged on the outer wall of the oil cylinder 1), so that the magnetic block does not generate an attractive force with the outer wall of the oil cylinder 1, and the magnetic block can track the position of the first piston 2.

[0059] In an optional embodiment of the present application, as shown in Figure 1 、 Figure 4 、 Figure 5 The top of the second piston 3 is provided with a positioning groove 303 opposite to the position adjustment bolt 6. The bottom of the position adjustment bolt 6 extends into the positioning groove 303. The abutting position of the position adjustment bolt 6 and the second piston 3 is positioned by the positioning groove 303, so as to ensure that the second piston 3 is in a fixed state under the normal use state of the first piston 2.

[0060] In an optional embodiment of the present application, as shown in Figures 1 to 5As shown, the two-section accumulator further comprises a position adjusting rod 7 arranged in the vertical direction, an inner passage 601 penetrating the position adjusting bolt 6 is arranged on the position adjusting bolt 6 along the axial direction, the top of the position adjusting rod 7 is located above the position adjusting bolt 6, the position adjusting rod 7 is inserted into the inner passage 601, and the bottom of the position adjusting rod 7 extends to the bottom of the position adjusting bolt 6; a plurality of positioning through holes 602 in communication with the inner passage 601 are uniformly arranged on the sidewall of the bottom of the position adjusting bolt 6 along the circumferential direction, a plurality of first clamping grooves 3031 are arranged in the inner portion of the positioning groove 303 at positions corresponding to the positioning through holes 602, a circular second clamping groove 701 is arranged on the outer wall of the bottom of the position adjusting rod 7 along the circumferential direction of the position adjusting rod 7, a plurality of balls 19 are arranged in the inner passage 601 and above the second clamping groove 701, the main body of each ball 19 is clamped between the outer wall of the position adjusting rod 7 and the corresponding positioning through hole 602, one side surface of the main body of each ball 19 penetrates the corresponding positioning through hole 602 and is embedded in the corresponding first clamping groove 3031, so that the position adjusting bolt 6 and the second piston 3 are positioned by the balls 19, and the second piston 3 is always in a fixed state when the position adjusting bolt 6 is not screwed; after the first piston 2 is damaged, the first oil cavity 101 and the second oil cavity 102 are in communication, at this time, the position adjusting rod 7 is lifted, the balls 19 roll into the second clamping groove 701 in the inner passage 601, the balls 19 are separated from the corresponding first clamping grooves 3031, the balls 19 do not play a positioning role on the position adjusting bolt 6 and the second piston 3, and the position adjusting bolt 6 is screwed to the top of the accommodating cavity 103, so that the second piston 3 can move up and down.

[0061] In an optional embodiment of the present application, as shown in Figure 1 The outer wall of the top of the oil cylinder 1 is provided with a first flange 10, and an opening is arranged on the top of the oil cylinder 1 and penetrates the accommodating cavity 103, a second flange 11 is arranged above the opening, a plurality of fastening bolts 12 are connected between the first flange 10 and the second flange 11 to block the opening on the top of the oil cylinder 1 by cooperation of the first flange 10 and the second flange 11. The opening on the top of the oil cylinder 1 facilitates the placement of the first piston 2, the second piston 3, the first accumulator spring 4 and the second accumulator spring 5 and other components in the oil cylinder 1.

[0062] Further, as shown in Figure 1 The position adjusting bolt 6 is located at the middle position of the opening, a threaded hole is arranged on the second flange 11, the position adjusting bolt 6 penetrates the threaded hole on the second flange 11 and extends into the accommodating cavity 103, and the position adjusting bolt 6 is threadedly connected with the threaded hole of the second flange 11.

[0063] In an optional embodiment of the present application, as shown in Figure 1As shown, the oil passage pipeline 18 is provided with an oil delivery main pipe 13, a first oil delivery branch pipe 14 and a second oil delivery branch pipe 15, one end of the oil delivery main pipe 13 is communicated with the inside of the oil passage pipeline 18, the other end of the oil delivery main pipe 13 is connected with one end of the first oil delivery branch pipe 14 and one end of the second oil delivery branch pipe 15 respectively, the other end of the first oil delivery branch pipe 14 is communicated with the bottom of the first oil cavity 101, the other end of the second oil delivery branch pipe 15 is communicated with the top of the second oil cavity 102; the first oil delivery branch pipe 14 is provided with a first valve 16 for controlling the on-off state of the first oil delivery branch pipe 14, the second oil delivery branch pipe 15 is provided with a second valve 17 for controlling the on-off state of the second oil delivery branch pipe 15.

[0064] In an optional embodiment of the present application, as shown in Figure 1 As shown, the inner wall of the oil cylinder 1 and above the position where the oil cylinder 1 is connected with the second oil delivery branch pipe 15 is provided with a circular ring-shaped limiting block 8 along the circumference of the oil cylinder 1, the second piston 3 can move downward to the position where the bottom of the second piston 3 abuts against the top of the limiting block 8, the downward position of the second piston 3 is limited by the limiting block 8, so as to prevent the second piston 3 from moving downward too far, thereby avoiding that the second piston 3 blocks the second oil delivery branch pipe 15 or the second piston 3 moves downward to the below of the second oil delivery branch pipe 15, so as to cause the second oil delivery branch pipe 15 to be communicated with the accommodating cavity 103.

[0065] The working principle of the two-stage accumulator of the application is as follows: before use, the position of the position adjusting bolt 6 is adjusted, the position adjusting bolt 6 is fixed to the second piston 3, and the compression amount of the first accumulator spring 4 is pre-adjusted through the position adjusting bolt 6. In the normal working state, the first valve 16 is opened, the second valve 17 is closed, the oil enters the first oil chamber 101 through the first oil delivery branch pipe 14 and pushes the first piston 2 to move upwards, and the first accumulator spring 4 is compressed to a position balanced with the oil pressure. At this time, if the system loses pressure, the first accumulator spring 4 will push the first piston 2 to move downwards to supplement the oil pressure to the system, thereby ensuring the stability of the system pressure. When the first piston 2 and / or the first sealing ring 201 and the second sealing ring 202 are damaged, the oil in the first oil chamber 101 will flow into the second oil chamber 102 until the oil pressure in the first oil chamber 101 and the second oil chamber 102 is balanced, and the first piston 2 will move downwards to the initial working position. At this time, the position of the position tracking device 9 (i.e., the position tracking device 9 is in an abnormal working position) can be observed by the worker. At this time, the first valve 16 can be closed, the second valve 17 can be opened, the position adjusting rod 7 can be lifted to make the balls 19 roll into the corresponding second clamping grooves 701, the position adjusting bolt 6 and the position adjusting rod 7 can be lifted to the top of the accommodating cavity 103, and the second piston 3 can move up and down, thereby enabling the second piston 3 to maintain the system pressure. At this time, the oil enters the second oil chamber 102 through the second oil delivery branch pipe 15 and pushes the second piston 3 to move upwards, and the second accumulator spring 5 is compressed to a position balanced with the oil pressure. At this time, if the system loses pressure, the second accumulator spring 5 will push the second piston 3 to move downwards to supplement the oil pressure to the system, thereby ensuring the stability of the system pressure.

[0066] The two-stage accumulator of the application has the following characteristics and advantages:

[0067] I. The two-stage accumulator has a two-stage pressure storage structure, has stronger pressure bearing capacity, can bear greater oil pressure than traditional accumulators, does not need to worry about the occurrence of phenomena such as burst failure and medium oil leakage of the accumulator during the working process, greatly increases the reliability and safety of the system, has a long service life, is convenient for workers to maintain and overhaul, and can effectively reduce the labor intensity and maintenance cost of workers.

[0068] II. The two-stage accumulator structure is provided with the first accumulator spring 4 and the second accumulator spring 5 in the inside of the oil cylinder 1, has a greater compression amount, and thereby avoids the failure of the accumulator due to instantaneous overpressure.

[0069] III. The two-stage accumulator has a simple structure, is convenient to operate, has a small footprint, and is suitable for popularization and use.

[0070] IV. The two-stage accumulator is provided with the position tracking device 9 on the outer wall of the oil cylinder 1, can track and display the moving position of the first piston 2, and can realize the tracking of the accumulator pressure.

[0071] The above description is only illustrative of the present application and is not intended to limit the scope of the present application. Any variations and modifications made by any person skilled in the art without departing from the spirit and principles of the present application shall fall within the scope of the present application.

Claims

1. A two-stage accumulator characterized in that, The oil cylinder (1) is internally provided with a first piston (2) and a second piston (3) from bottom to top, so as to divide the inside of the oil cylinder (1) into a first oil cavity (101), a second oil cavity (102) and a containing cavity (103) from bottom to top, the first oil cavity (101) and the second oil cavity (102) are respectively and discontinuously connected with an oil circuit pipeline (18), the second oil cavity (102) and the containing cavity (103) are respectively provided with a first energy storage spring (4) and a second energy storage spring (5), and the top of the oil cylinder (1) is provided with a position adjusting bolt (6); The first piston (2) and the second piston (3) are movably arranged in the inside of the oil cylinder (1), and the first piston (2) is sequentially sleeved with a first sealing ring (201) and a second sealing ring (202) from bottom to top, the first sealing ring (201) and the second sealing ring (202) seal the first oil cavity (101) and the second oil cavity (102), and the second piston (3) is sequentially sleeved with a third sealing ring (301) and a fourth sealing ring (302) from bottom to top, the third sealing ring (301) and the fourth sealing ring (302) seal the second oil cavity (102) and the containing cavity (103); The top of the second piston (3) is provided with a positioning groove (303) opposite to the position adjusting bolt (6), and the bottom of the position adjusting bolt (6) extends into the positioning groove (303); The two-section energy accumulator further comprises a position adjusting rod (7) arranged in the vertical direction, the position adjusting bolt (6) is provided with an inner channel (601) penetrating through the position adjusting bolt (6) in the axial direction, the top of the position adjusting rod (7) is located above the position adjusting bolt (6), the position adjusting rod (7) is inserted into the inner channel (601), and the bottom of the position adjusting rod (7) extends to the bottom of the position adjusting bolt (6); A plurality of positioning through holes (602) are formed in the side wall of the bottom of the position adjusting bolt (6) and communicate with the inner channel (601), a plurality of first clamping grooves (3031) are formed in the inside of the positioning groove (303) and correspond to the positioning through holes (602), a second clamping groove (701) is formed in the outer wall of the bottom of the position adjusting rod (7) and surrounds the position adjusting rod (7), a plurality of balls (19) are arranged in the inner channel (601) and above the second clamping groove (701), the body of each ball (19) is clamped between the outer wall of the position adjusting rod (7) and the corresponding positioning through hole (602), one side of the body of each ball (19) penetrates through the corresponding positioning through hole (602) and is embedded in the corresponding first clamping groove (3031), so as to position the position adjusting bolt (6) and the second piston (3). Lifting the position adjusting rod (7), each ball (19) rolls into the second slot (701) in the inner channel (601), each ball (19) is separated from the corresponding first slot (3031), and the position adjusting bolt (6) is screwed to the top of the accommodating cavity (103), and the second piston (3) can move up and down. When the first oil cavity (101) is communicated with the oil way pipeline (18), and the second oil cavity (102) is disconnected with the oil way pipeline (18), the bottom of the position adjusting bolt (6) extends into the accommodating cavity (103) and abuts against the top of the second piston (3). When the first oil cavity (101) is disconnected with the oil way pipeline (18), and the second oil cavity (102) is communicated with the oil way pipeline (18), the position adjusting bolt (6) is screwed to the top of the accommodating cavity (103), and the position adjusting bolt (6) is separated from the second piston (3).

2. The two-stage accumulator of claim 1, wherein, The outer wall of the oil cylinder (1) is provided with a position tracking device (9) for displaying the moving position of the first piston (2); The position tracking device (9) comprises a sliding rail and a magnetic block capable of generating suction force with the first piston (2), the magnetic block is provided with a pulley, the sliding rail is arranged on the outer wall of the oil cylinder (1) along the moving direction of the first piston (2), and the pulley is slidably arranged on the sliding rail, so that the magnetic block can move along the sliding rail.

3. The two-stage accumulator of claim 1, wherein, The top outer wall of the oil cylinder (1) is provided with a first flange (10), the top of the oil cylinder (1) is provided with an opening penetrating through the accommodating cavity (103), a second flange (11) is arranged above the opening, a plurality of fastening bolts (12) are connected between the first flange (10) and the second flange (11) to block the opening.

4. The two-stage accumulator of claim 3, wherein The position adjusting bolt (6) is located at the middle position of the opening, the position adjusting bolt (6) penetrates through the second flange (11) and extends into the accommodating cavity (103), and the position adjusting bolt (6) is threadedly connected with the second flange (11).

5. The two-stage accumulator of claim 1, wherein, The oil way pipeline (18) and the oil cylinder (1) are provided with an oil delivery main pipe (13), a first oil delivery branch pipe (14) and a second oil delivery branch pipe (15), one end of the oil delivery main pipe (13) is communicated with the inside of the oil way pipeline (18), the other end of the oil delivery main pipe (13) is connected with one end of the first oil delivery branch pipe (14) and one end of the second oil delivery branch pipe (15) respectively, the other end of the first oil delivery branch pipe (14) is communicated with the first oil cavity (101), and the other end of the second oil delivery branch pipe (15) is communicated with the second oil cavity (102). The first oil delivery branch pipe (14) and the second oil delivery branch pipe (15) are respectively provided with a first valve (16) and a second valve (17).

6. The two-stage accumulator of claim 5, wherein, The first oil liquid conveying branch pipe (14) communicates with the bottom of the first oil cavity (101), and the second oil liquid conveying branch pipe (15) communicates with the top of the second oil cavity (102).

7. The two-stage accumulator of claim 5, wherein, A limiting block (8) is arranged on the inner wall of the oil cylinder (1) and above the position where the oil cylinder (1) is connected with the second oil liquid conveying branch pipe (15), and the second piston (3) can be moved downward to a position where the bottom of the second piston (3) abuts against the top of the limiting block (8), so as to limit the downward position of the second piston (3).

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