An accumulator for a hydraulic system

Abstract

The present application relates to the technical fields of hydraulic system, especially to a kind of accumulator for hydraulic system.It includes first shell, the first shell is fixed with second shell, the second shell is equipped with elastic unit, the elastic unit is equipped with inflation valve, the first shell is equipped with valve body, the valve body is slidably provided with sliding plug, the valve body is provided with multiple through holes, the sliding plug is fixed with second spring between the valve body;The valve body is fixed with spline sleeve, the spline sleeve is slidably provided with sliding frame, the sliding frame and the spline sleeve are fixed with third spring between, the sliding frame is fixed with multiple limiters, the limiters are located in the corresponding through hole on the valve body, the outer side of the limiter is composed of two variable-diameter sections and middle constant-diameter section.The present application changes the flow cross section on the valve body by the movement of the limiter, controls the deformation rate of the elastic unit, reduces the aging rate of the elastic unit.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems, and in particular to an accumulator for a hydraulic system. Background Art

[0002] In hydraulic systems, accumulators, as key energy storage and regulation components, are widely used to absorb pressure pulsations, compensate for leaks, provide emergency power, and improve system response. Accumulators can be categorized by their structural type, including bladder, piston, and diaphragm types. Bladder accumulators are widely used in high-pressure and high-capacity applications due to their superior performance.

[0003] Despite this, in actual use, pressure changes within bladder accumulators often exhibit nonlinear characteristics. This nonlinearity is primarily due to the combined effects of factors such as gas compression characteristics, oil compressibility, temperature fluctuations, and loading rate. Specifically, when pressure in the hydraulic system suddenly increases, the high-pressure fluid rapidly squeezes the bladder within the accumulator, causing it to rapidly contract. This rapid compression of the gas causes the internal temperature of the bladder to rise or fall sharply, leading to the accumulation of thermal stress and accelerated aging of the rubber material.

[0004] Furthermore, sudden changes in accumulator pressure can stimulate mechanical resonance in the system or generate pressure shock waves, threatening the reliability of piping, seals, and actuators. These can lead to fatigue damage and seal failure, shortening the life of the entire equipment. This not only impacts the stability and safety of the hydraulic system, but also increases maintenance costs and downtime, reducing overall efficiency. Summary of the Invention

[0005] In order to overcome the problems mentioned in the above background technology, the present invention provides an accumulator for a hydraulic system.

[0006] The technical solution is as follows: an accumulator for a hydraulic system, comprising a first housing, the first housing being detachably fixedly connected to a second housing, the second housing being mounted with an elastic unit, the elastic unit being mounted with a first locking member, the elastic unit being mounted with an inflation valve, the first housing being mounted with a valve body, the valve body being slidably provided with a sliding plug, the valve body being provided with a plurality of through holes, a second spring being fixedly connected between the sliding plug and the valve body, and the valve body being threadedly connected with a second locking member;

[0007] The valve body is fixedly connected to a spline sleeve, a sliding frame is slidably provided on the spline sleeve, a third spring is fixedly connected between the sliding frame and the spline sleeve, and a plurality of limit members are fixedly connected to the sliding frame. The number of the limit members is the same as the number of through holes on the valve body. The limit members are located in the corresponding through holes on the valve body, and the outer side surface of the limit member is composed of variable diameter sections on both sides and a constant diameter section in the middle.

[0008] Preferably, the second shell is provided with a convex ring, and the convex ring of the second shell is slidably connected to the first shell.

[0009] Preferably, the elastic unit includes a first elastic bag, the first elastic bag is threadedly connected to the first locking member, the first elastic bag is fixedly connected to a first fixed shell, the first fixed shell is slidably provided with a sliding shell, and the sliding shell is fixedly connected to a second elastic bag.

[0010] Preferably, the valve body is provided with a first annular inclined surface, and the sliding plug is provided with a second annular inclined surface, and the first annular inclined surface is used to contact and press the second annular inclined surface.

[0011] Preferably, the sliding plug is provided with a step surface, and when the first annular inclined surface and the second annular inclined surface are in contact with each other, the step surface and the valve body form an annular groove.

[0012] Preferably, the first fixed shell and the sliding shell are both fixedly connected to fixed plates, and a first spring is fixedly connected between the two fixed plates.

[0013] Preferably, the sliding frame is slidably provided with multiple sliding columns, a fourth spring is installed between the sliding columns and the sliding frame, the spline sleeve is provided with multiple groups of blind holes, the number of groups of blind holes on the spline sleeve is the same as the number of the sliding columns, and the sliding columns are used to be inserted into the corresponding blind holes on the spline sleeve.

[0014] Preferably, it also includes:

[0015] a second fixed shell, fixedly connected to one of the fixed plates;

[0016] a sliding rod fixedly connected to the other fixed plate, wherein the sliding rod slides in a sealed manner with the second fixed shell;

[0017] A plurality of exhaust pipes are all fixedly connected to and communicated with the second fixed shell.

[0018] Preferably, a one-way valve is installed on a portion of the exhaust pipe on the second fixed shell.

[0019] Preferably, it also includes:

[0020] a first guide housing fixedly connected to the valve body, the sliding frame being located between the first guide housing and the limiting member, and a plurality of connecting rods being fixedly connected to the first guide housing;

[0021] The second guide shell is fixedly connected to the outer ends of all the connecting rods. The second guide shell and the first guide shell are used to guide the flow of the liquid medium.

[0022] The beneficial effects are as follows: the present invention changes the flow cross-section on the valve body through the movement of the limit member, controls the deformation rate of the elastic unit, reduces the aging rate of the elastic unit, and reduces the wear of the elastic unit; through the relative sliding of the sliding shell and the fixed plate, combined with the deformation of the first spring, the elastic unit converts the pressure fluctuation in the hydraulic system into gas pressure potential energy and elastic potential energy of the first spring, which to a certain extent compensates for the instability that may be caused by a single energy storage method. At the same time, the first spring can share the working load of the gas to a certain extent, which helps to reduce fatigue damage of the elastic unit and thus extend the overall service life of the accumulator; the limiting force generated by the sliding column inserted into the corresponding blind hole on the spline sleeve is used to control the movement frequency of the limit member to ensure that the accumulator can work smoothly under different pressure fluctuations; the first guide shell and the second guide shell guide the liquid medium in the hydraulic system, and the impurities in the hydraulic system are guided and collected, so as to facilitate the normal operation of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 Schematic diagram of the three-dimensional structure of the valve body and the sliding plug of the present invention;

[0025] Figure 3 is a cross-sectional view of the valve body and sliding plug of the present invention;

[0026] Figure 4 is a cross-sectional view of the sliding frame and the limiting member of the present invention;

[0027] Figure 5 Schematic diagram of the three-dimensional structure of the sliding column and the fourth spring of the present invention;

[0028] Figure 6 is a schematic diagram of the three-dimensional structure of the second fixed shell and the sliding rod of the present invention;

[0029] Figure 7 is a cross-sectional view of the second fixed housing and the sliding rod of the present invention;

[0030] Figure 8 It is a cross-sectional view of the second fixing shell and the exhaust pipe of the present invention.

[0031] Among them: 1-first shell, 2-second shell, 3-elastic unit, 301-first elastic sac, 302-first fixed shell, 303-sliding shell, 304-fixed plate, 305-first spring, 306-second elastic sac, 4-first locking member, 5-inflating valve, 7-valve body, 701-first annular inclined surface, 702-second annular inclined surface, 703-step surface, 8-sliding plug, 801-second spring, 9-second locking member, 10-spline sleeve, 11-sliding frame, 12-third spring, 13-limiting member, 14-sliding column, 15-fourth spring, 16-second fixed shell, 17-sliding rod, 18-exhaust pipe, 19-one-way valve, 20-first guide shell, 21-connecting rod, 22-second guide shell. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, rather than limiting the present invention. Moreover, relational terms such as "first" and "second" are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0033] Example 1: An accumulator for a hydraulic system, referring to Figure 1 and Figure 2 As shown, it includes a first shell 1, which is detachably fixed to a second shell 2, and an elastic unit 3 is installed on the second shell 2. The elastic unit 3 is located in the first shell 1 and the second shell 2, and the elastic unit 3 is installed with a first locking member 4. The elastic unit 3 is installed with an inflation valve 5, which is used to pre-fill nitrogen into the elastic unit 3 and adjust the gas pressure therein. The structure of the inflation valve 5 is similar to that of a one-way valve to prevent gas leakage, and the inflation valve 5 can be connected to a pressure gauge to facilitate observation of the gas pressure in the elastic unit 3. The first shell 1 is installed with a valve body 7, and a sealing ring is provided on the valve body 7. The sealing ring on the valve body 7 contacts the first shell 1 to improve the sealing between the two. The valve body 7 is slidably provided with a sliding plug 8, and the valve body 7 is provided with six through holes equidistantly distributed circumferentially. A second spring 801 is fixed between the sliding plug 8 and the valve body 7, and the valve body 7 is threadedly connected with a second locking member 9. The second locking member 9 is used to squeeze the sealing ring on the valve body 7 to enhance the fit between the sealing ring on the valve body 7 and the first shell 1.

[0034] Reference Figure 2-Figure 4As shown, the valve body 7 is fixed with a spline sleeve 10, and the spline sleeve 10 is slidably provided with a sliding frame 11. A third spring 12 is fixed between the sliding frame 11 and the spline sleeve 10, and the sliding frame 11 is fixed with six circumferentially equidistantly distributed limit members 13. The limit members 13 are located in the corresponding through holes on the valve body 7. The limit members 13 are divided into three sections. The two sections on the outside of the limit members 13 are variable diameter sections, and the section in the middle of the limit members 13 is a constant diameter section. The cross-sections of the two variable diameter sections of the limit members 13 gradually increase from the middle to the two sides. The maximum cross-section on the limit member 13 is smaller than the cross-section of the through hole on the valve body 7. The second shell 2 is provided with a convex ring, and the convex ring of the second shell 2 is slidably connected to the first shell 1.

[0035] Reference Figure 2 and Figure 6 As shown, the elastic unit 3 includes a first elastic capsule 301, the upper end of the first elastic capsule 301 is provided with an external thread, the external thread of the first elastic capsule 301 is threadedly connected to the first locking member 4, the first elastic capsule 301 is connected to the first fixed shell 302, the first elastic capsule 301 is fixed to the outside of the first fixed shell 302 by an existing clamp, the first fixed shell 302 is slidably provided with a sliding shell 303, the sliding shell 303 is connected to the second elastic capsule 306, the second elastic capsule 306 is fixed to the outside of the sliding shell 303 by an existing clamp, the first elastic capsule 301 and the second elastic capsule 306 are both made of oil-resistant and fatigue-resistant synthetic rubber (such as nitrile rubber, fluororubber), the valve body 7 is provided with a first annular inclined surface 701, The sliding plug 8 is provided with a second annular inclined surface 702, and the first annular inclined surface 701 is used to contact and squeeze the second annular inclined surface 702, so that the sliding plug 8 blocks the valve body 7. The sliding plug 8 is provided with a step surface 703. When the first annular inclined surface 701 and the second annular inclined surface 702 are in contact, the step surface 703 and the valve body 7 form an annular groove. The annular groove is used to prevent the second elastic bag 306 from being clamped and avoid damage to the second elastic bag 306. The first fixed shell 302 and the sliding shell 303 are both fixedly connected to the fixed plate 304. The sliding shell 303 is provided with multiple sealing rings (not shown in the figure) for improving the sealing between the first fixed shell 302 and the sliding shell 303. A first spring 305 is fixedly connected between the two fixed plates 304.

[0036] The working process of the accumulator in this embodiment is as follows:

[0037] First, connect the valve body 7 to the hydraulic system, then connect the air pump to the inflation valve 5, and then start the air pump to inject gas into the elastic unit 3 through the inflation valve 5. As the gas is injected into the elastic unit 3, the pressure gradually increases. When the pressure in the elastic unit 3 reaches the specified value, turn off the air pump to complete the preliminary preparation of the accumulator. Then start the hydraulic system. The liquid in the hydraulic system will fill the first shell 1 and the second shell 2 through the through hole on the valve body 7.

[0038] During the operation of the hydraulic system, when pressure fluctuations occur in the hydraulic system, the pressure fluctuations in the hydraulic system act on the first housing 1 and the second housing 2 through the valve body 7. When the pressure increases, the high-pressure fluctuations will squeeze the elastic unit 3 to deform, wherein the first elastic bag 301 and the second elastic bag 306 shrink. At the same time, the first fixed shell 302 and the sliding shell 303 slide relative to each other and compress the first spring 305. This operation converts part of the high-pressure potential energy in the hydraulic system into the compression potential energy of the gas in the elastic unit 3 and the elastic potential energy of the first spring 305, buffering and storing the pressure fluctuations in the hydraulic system. When the pressure decreases, the elastic unit 3 is squeezed by the high-pressure gas to expand the first elastic bag 301 and the second elastic bag 306, so that part of the liquid in the first housing 1 and the second housing 2 enters the hydraulic system through the through hole on the valve body 7, compensating the flow in the hydraulic system or maintaining the pressure stability in the hydraulic system, ensuring stable operation of the hydraulic system.

[0039] In the process of liquid passing through the through holes on the valve body 7 in the hydraulic system, the liquid simultaneously impacts the six limit members 13 and the sliding frame 11 to move. The movement of the limit members 13 changes the gap between them and the corresponding through holes on the valve body 7, changes the flow cross-section of the valve body 7, controls the deformation rate of the elastic unit 3, and reduces the temperature change of the gas in the elastic unit 3.

[0040] Example 2: Reference Figure 4 and Figure 5 As shown, the sliding frame 11 is slidingly provided with six sliding columns 14 distributed equidistantly in the circumferential direction, and a fourth spring 15 is installed between the sliding column 14 and the sliding frame 11. The fourth spring 15 is always in a compressed state. The spline sleeve 10 is provided with six groups of blind holes distributed equidistantly in the circumferential direction, and the number of blind holes in each group is five. The five blind holes in the same group are evenly distributed (this number is the number expressed in the accompanying drawings, and the actual number can be adjusted according to actual conditions). The blind hole is hemispherical, and the sliding column 14 is provided at the hemispherical end. In the initial state, the hemispherical end of the sliding column 14 is located in the third blind hole of the corresponding group.

[0041] The working process of this embodiment is similar to that of the first embodiment and is described in detail as follows:

[0042] In the process of liquid passing through the through hole on the valve body 7 in the hydraulic system, the high-pressure liquid impacts the lower side of the limiter 13 and the sliding frame 11. When the impact force of the high-pressure liquid on the six limiters 13 and the sliding frame 11 is greater than the limiting force generated by the six sliding posts 14, the six limiters 13 and the sliding frame 11 move up together. In this process, the sliding post 14 is squeezed into the sliding frame 11 by the adjacent blind hole and compresses the adjacent fourth spring 15. After the sliding post 14 moves up to the next blind hole, the sliding post 14 is re-inserted into the corresponding blind hole under the elastic action of the fourth spring 15. The movement of the sliding frame 11 is The third spring 12 is stretched, and under the pulling force of the third spring 12, the limit member 13 remains stationary in the position after moving. At the same time, when the pressure in the hydraulic system is reduced, the liquid passes through the through hole on the valve body 7 from top to bottom, and the liquid impacts the upper side surface of the limit member 13, causing the limit member 13 and the sliding frame 11 to move downward. At the same time, the sliding column 14 is inserted into the corresponding blind hole. At this time, the sliding frame 11 moves downward and compresses the third spring 12, so that the limit member 13 remains stationary in the position after moving, thereby avoiding frequent movement of the limit member 13 affecting the smooth flow of liquid at the through hole on the valve body 7, thereby improving the working stability of the device.

[0043] Example 3: Reference Figure 6-Figure 8 As shown, it also includes: a second fixed shell 16, fixed to the lower side of the upper fixed plate 304; a sliding rod 17, fixed to the upper side of the lower fixed plate 304, the upper part of the sliding rod 17 slidingly sealing with the second fixed shell 16; six exhaust pipes 18 equidistantly distributed around the circumference, all fixed to and connected to the upper part of the second fixed shell 16, and one-way valves 19 are installed in three exhaust pipes 18 equidistantly distributed around the circumference. The one-way valves 19 are used to prevent gas outside the second fixed shell 16 from entering it through the corresponding exhaust pipes 18.

[0044] The working process of this embodiment is similar to that of the first embodiment and is described in detail as follows:

[0045] When the pressure in the pressure hydraulic system increases, the operation in the above embodiment 1 is repeated. During the relative movement of the first fixed housing 302 and the sliding housing 303, the first fixed housing 302 drives the second fixed housing 16 and the sliding rod 17 to move relative to each other through the adjacent fixed plate 304. During this process, the sliding rod 17 moves to squeeze the gas in the second fixed housing 16, causing the gas in the second fixed housing 16 to be discharged through the exhaust pipe 18. When the pressure in the subsequent hydraulic system is restored, the first fixed housing 302 and the sliding housing 303 move in opposite directions under the action of the high-pressure gas in the elastic unit 3. At the same time, the second fixed housing 16 and the sliding rod 17 move in opposite directions. During this process, the gas entering the second fixed housing 16 is slow due to the obstruction of the one-way valves 19 in the three exhaust pipes 18. As a result, the gas is slowly released between the second fixed housing 16 and the sliding rod 17, thereby avoiding the pressure fluctuation in the hydraulic system driving the first fixed housing 302 and the sliding housing 303 to fluctuate at the same frequency, effectively reducing component fatigue damage caused by vibration.

[0046] Example 4: Reference Figure 3 and Figure 4 As shown, it also includes: a first guide shell 20, which is fixed to the lower part of the valve body 7. The first guide shell 20 is located below the sliding frame 11. The first guide shell 20 is fixed to the second guide shell 22 through a plurality of connecting rods 21. The second guide shell 22 and the first guide shell 20 are used to guide the flow of the liquid medium. The first guide shell 20 consists of two parts. The upper half of the first guide shell 20 is annular and inclined, and the cross-section of the upper half of the first guide shell 20 gradually becomes smaller from top to bottom.

[0047] The working process of this embodiment is similar to that of the first embodiment and is described in detail as follows:

[0048] During the operation of the hydraulic system, pressure fluctuations in the liquid system cause the liquid in the hydraulic system to enter the valve body 7. Subsequently, the liquid is guided by the second guide shell 22 and the first guide shell 20, and the liquid bends and flows. The second guide shell 22 and the first guide shell 20 first weaken the pressure fluctuations of the liquid. At the same time, the guidance of the second guide shell 22 and the first guide shell 20 slows down the flow of the liquid. Impurities in the liquid accumulate on the lower surface of the first guide shell 20. Under the tilting action of the first guide shell 20, the impurities are collected, thereby reducing the impurities entering the accumulator and extending the effective working time of the accumulator.

[0049] It should be noted that the above preferred embodiments are merely illustrative of the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit and essence of the present invention are intended to be encompassed within the scope of protection of the present invention.

Claims

1. An accumulator for a hydraulic system, characterized in that: The invention comprises a first shell (1), wherein the first shell (1) is detachably fixedly connected to a second shell (2), the second shell (2) is installed with an elastic unit (3), the elastic unit (3) is installed with a first locking member (4), the elastic unit (3) is installed with an inflation valve (5), the first shell (1) is installed with a valve body (7), the valve body (7) is slidably provided with a sliding plug (8), the valve body (7) is provided with a plurality of through holes, a second spring (801) is fixedly connected between the sliding plug (8) and the valve body (7), and the valve body (7) is threadedly connected with a second locking member (9); The valve body (7) is fixedly connected to a spline sleeve (10), and the spline sleeve (10) is slidably provided with a sliding frame (11), and a third spring (12) is fixedly connected between the sliding frame (11) and the spline sleeve (10), and the sliding frame (11) is fixedly connected to a plurality of limit members (13), the number of the limit members (13) is the same as the number of through holes on the valve body (7), and the limit members (13) are located in the corresponding through holes on the valve body (7), and the outer side surface of the limit member (13) is composed of variable diameter sections on both sides and a constant diameter section in the middle; The cross-sections of the two variable diameter sections of the limiting member (13) gradually increase from the middle to the two sides, and the maximum cross-section of the limiting member (13) is smaller than the cross-section of the through hole on the valve body (7); The sliding frame (11) is slidably provided with a plurality of sliding columns (14), a fourth spring (15) is installed between the sliding columns (14) and the sliding frame (11), the spline sleeve (10) is provided with a plurality of groups of blind holes, the number of groups of blind holes on the spline sleeve (10) is the same as the number of the sliding columns (14), and the sliding columns (14) are used to be inserted into the corresponding blind holes on the spline sleeve (10).

2. An accumulator for a hydraulic system according to claim 1, characterized in that: The second shell (2) is provided with a convex ring, and the convex ring of the second shell (2) is slidably connected to the first shell (1).

3. The accumulator for a hydraulic system according to claim 1, characterized in that: The elastic unit (3) comprises a first elastic sac (301), the first elastic sac (301) is threadedly connected to the first locking member (4), the first elastic sac (301) is fixedly connected to a first fixed shell (302), the first fixed shell (302) is slidably provided with a sliding shell (303), and the sliding shell (303) is fixedly connected to a second elastic sac (306).

4. An accumulator for a hydraulic system according to claim 3, characterized in that: The valve body (7) is provided with a first annular inclined surface (701), and the sliding plug (8) is provided with a second annular inclined surface (702), wherein the first annular inclined surface (701) is used to contact and squeeze the second annular inclined surface (702).

5. An accumulator for a hydraulic system according to claim 4, characterized in that: The sliding plug (8) is provided with a step surface (703), and when the first annular inclined surface (701) and the second annular inclined surface (702) are in contact with each other, the step surface (703) and the valve body (7) form an annular groove.

6. The accumulator for a hydraulic system according to claim 3, characterized in that: The first fixed shell (302) and the sliding shell (303) are both fixedly connected to a fixed plate (304), and a first spring (305) is fixedly connected between the two fixed plates (304).

7. An accumulator for a hydraulic system according to claim 6, characterized in that: Also included are: A second fixed shell (16) is fixedly connected to one of the fixed plates (304); A sliding rod (17) is fixed to the other fixed plate (304), and the sliding rod (17) slides in a sealed manner with the second fixed shell (16); A plurality of exhaust pipes (18) are all fixedly connected to and communicated with the second fixed shell (16).

8. An accumulator for a hydraulic system according to claim 7, characterized in that: A one-way valve (19) is installed on a portion of the exhaust pipe (18) on the second fixed shell (16).

9. The accumulator for a hydraulic system according to claim 1, characterized in that: Also included are: A first guide shell (20) is fixedly connected to the valve body (7), the sliding frame (11) is located between the first guide shell (20) and the limiting member (13), and the first guide shell (20) is fixedly connected to a plurality of connecting rods (21); The second guide shell (22) is fixedly connected to the outer ends of all the connecting rods (21), and the second guide shell (22) and the first guide shell (20) are used to guide the flow of the liquid medium.

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