An accumulator lower cover and an accumulator

Abstract

The utility model relates to the technical field of energy accumulator, concretely relates to an energy accumulator lower cover and energy accumulator, include: casing, the middle part of casing is recessed and forms oil cavity, pass through the oil department, the oil department is located the bottom of oil cavity, and it includes a plurality of array arrangement's pass through the oil hole, pass through the oil hole is the stepped structure that penetrates the bottom of oil cavity, and it includes the first end and the second end of coaxial different diameters, the second end inner diameter is greater than the first end inner diameter, through above setting, can effectively avoid pass through the oil hole block and avoid response delay, ensure that the broken hammer impact force stability, still can effectively reduce the resonance probability.

Description

Technical Field

[0001] This utility model relates to a lower cover of an energy storage device and an energy storage device, belonging to the field of energy storage technology. Background Technology

[0002] In hydraulic breakers and other engineering machinery, accumulators are key components used to store hydraulic energy, absorb pressure pulsations, and compensate for leaks. Their performance directly affects the working efficiency and reliability of the breaker. The accumulator lower cover is an important part of the accumulator. During the operation of the breaker, metal particles inevitably mix into the hydraulic oil. These metal particles directly enter the accumulator's oil chamber, easily scratching the diaphragm inside the accumulator, causing poor sealing and pressure leakage. At the same time, they can easily clog the oil passages, affecting the normal flow of hydraulic oil. Moreover, the flow velocity distribution and pressure changes during hydraulic oil flow are difficult to optimize. It is difficult to achieve an effective increase in fluid flow to meet the requirements of rapid response, and pressure loss is easily generated after the fluid exits the passage, reducing pressure transmission efficiency and affecting the stability of the breaker's impact force. Finally, existing accumulators are prone to resonance under the high-frequency impact of the breaker, and may even lead to fatigue cracks and damage. Therefore, researching a new type of accumulator lower cover and accumulator is of great practical significance. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a lower cover for an energy accumulator and an energy accumulator.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A accumulator lower cover includes: a shell, wherein the middle part of the shell is recessed to form an oil cavity, and a plurality of threaded holes are arranged around the oil cavity in a circumferential direction;

[0005] The oil passage is located at the bottom of the oil cavity and includes a plurality of oil passage holes arranged in an array. Each oil passage hole is a stepped structure that penetrates the bottom of the oil cavity and includes a first end and a second end that are coaxial but have different diameters. The first end is connected to the upper surface of the bottom of the oil cavity, and the second end is connected to the lower surface of the bottom of the oil cavity. The inner diameter of the second end is larger than the inner diameter of the first end.

[0006] Furthermore, the inner diameter D1 of the first end is 0.5-0.7 times the inner diameter D2 of the second end.

[0007] Furthermore, the inner wall of the oil cavity is composed of a wave-shaped structure made up of several concave rings, including a first concave ring, a second concave ring, and a third concave ring, all of which have arc cross-sections and are connected sequentially from top to bottom along the axial direction of the oil cavity.

[0008] Furthermore, the connection between the first concave ring and the second concave ring is provided with a first convex ring that protrudes radially toward the axis of the oil cavity, and the connection between the second concave ring and the third concave ring is provided with a second convex ring that protrudes radially toward the axis of the oil cavity.

[0009] Furthermore, the relationship between the curvature radius r1 of the first concave ring, the curvature radius r2 of the second concave ring, and the curvature radius r3 of the third concave ring satisfies: r1:r2:r3=(1.8-2.0):(1.2-1.4):1.

[0010] Furthermore, the radius of curvature of the first convex ring is 3-3.5 times that of the radius of curvature of the second convex ring.

[0011] Furthermore, the oil passage is a disc-shaped, wave-shaped structure that spreads outward from the center. It includes an inner concave ring and an outer concave ring arranged concentrically. The cross-sections of the inner and outer concave rings are both arcs that are concave towards the lower surface of the bottom of the oil cavity, and the connection between the two is transitioned by a rounded corner. The outer concave ring is connected to the third concave ring.

[0012] Furthermore, the inner concave ring and the outer concave ring have the same radius of curvature, and their radii of curvature are 2.1-2.2 times the radius of curvature r3 of the third concave ring.

[0013] This utility model also provides an energy storage device, including the lower cover of the energy storage device described above, and also including an upper cover and a diaphragm. The upper cover and the lower cover are fastened together by bolts passing through the threaded holes, and the diaphragm is fixed in the cavity between the upper cover and the lower cover.

[0014] The beneficial effects of this utility model are:

[0015] ① By setting a stepped oil passage hole, when hydraulic oil flows into the oil chamber, the step at the connection between the first and second ends can intercept some metal particles, preventing excessive number or large diameter metal particles from entering the accumulator. This can effectively reduce the probability of the diaphragm not sealing properly due to the influence of metal particles. When hydraulic oil flows out of the oil chamber, the hydraulic oil will flush and carry away the metal particles remaining at the step, which can effectively prevent the oil passage hole from being blocked. Compared with the straight oil passage hole, the high pressure sealing durability of the accumulator in this application is improved by 35%, and the oil passage hole blockage rate is reduced to 1% / 100 hours.

[0016] ② By setting a stepped oil passage, the first end can increase the flow rate of the hydraulic oil, ensuring that the hydraulic oil enters and exits the accumulator quickly and effectively avoids response delay. The second end can act as a diffuser, effectively reducing the eddy current intensity of the hydraulic oil flow and reducing the pressure loss when the hydraulic oil flows. The energy transfer efficiency is increased to 95%, ensuring the stable impact force of the hydraulic breaker.

[0017] ③ By utilizing the non-uniformity of the stepped oil passage structure, the natural frequency of the oil passage changes from a single value to a multi-value distribution, which can effectively avoid coinciding with the high-frequency impact frequency of the hydraulic breaker and effectively reduce the resonance probability under the high-frequency impact of the hydraulic breaker. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the accumulator lower cover provided in Embodiment 1 of this utility model;

[0019] Figure 2 This is a three-dimensional sectional view of the lower cover of the accumulator provided in Embodiment 1 of this utility model;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 for Figure 3 Enlarged view of section B in the middle.

[0022] Reference numerals: 1. Housing; 2. Oil cavity; 3. Threaded hole; 4. Oil passage part; 41. Oil passage hole; 411. First end; 412. Second end; 42. Inner concave ring; 43. Outer concave ring; 5. First concave ring; 6. Second concave ring; 7. Third concave ring; 8. First convex ring; 9. Second convex ring. Detailed Implementation

[0023] The specific embodiments of this utility model are described in detail below. This utility model can be implemented in many ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used is for describing particular embodiments only and is not intended to limit the scope of this invention.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] Example 1:

[0028] like Figure 1-4 As shown, this utility model provides a lower cover for an energy accumulator, including: a housing 1, the middle of which is recessed to form an oil cavity 2, and a plurality of threaded holes 3 are arranged around the oil cavity 2. It should be noted that the oil cavity 2 and the housing 1 are integral structures formed by processing, and the oil cavity 2 is a bowl shape that gradually tapers from top to bottom.

[0029] The oil passage 4 is located at the bottom of the oil cavity 2 and includes a plurality of oil passage holes 41 arranged in an array. The oil passage holes 41 are used for hydraulic oil to enter and exit. The oil passage holes 41 are stepped structures that penetrate the bottom of the oil cavity 2 and include a first end 411 and a second end 412 that are coaxial but have different diameters. The first end 411 and the second end 412 are integral structures formed by machining. The first end 411 is connected to the upper surface of the bottom of the oil cavity 2 and the second end 412 is connected to the lower surface of the bottom of the oil cavity 2. The inner diameter of the second end 412 is larger than the inner diameter of the first end 411.

[0030] Firstly, in the accumulator lower cover of the hydraulic breaker, the oil passage 41 is a crucial channel for hydraulic oil to enter and exit the oil chamber 2. During operation, some metal particles may mix into the hydraulic oil. By setting a stepped oil passage 41, when the hydraulic oil flows into the oil chamber 2, the stepped section connecting the first end 411 and the second end 412 can trap some metal particles, preventing excessive numbers or large-diameter metal particles from entering the accumulator. This effectively reduces the probability of the diaphragm failing to seal properly due to metal particles. When the hydraulic oil flows out of the oil chamber 2, it flushes and carries away the metal particles remaining at the stepped section, effectively preventing the oil passage 41 from becoming clogged. Compared to a straight-hole oil passage 41, the high-pressure sealing of the accumulator in this application... Durability is improved by 35%, and the clogging rate of the oil passage 41 is reduced to 1% / 100 hours. Secondly, by setting the stepped oil passage 41, the first end 411 can act as a flow rate increaser, ensuring that the hydraulic oil enters and exits the accumulator quickly, which can effectively avoid response delay. The second end 412 acts as a diffuser, which can effectively reduce the eddy current intensity of the hydraulic oil flow and reduce the pressure loss during hydraulic oil flow. The energy transfer efficiency is increased to 95%, ensuring the stability of the breaker's impact force. Finally, through the non-uniform structure of the stepped oil passage 41, the natural frequency of the oil passage 41 changes from a single value to a multi-value distribution, which can effectively avoid overlapping with the high-frequency impact frequency of the breaker and effectively reduce the resonance probability under the high-frequency impact of the breaker.

[0031] Preferred, such as Figure 4 As shown, the inner diameter D1 of the first end 411 is 0.5-0.7 times the inner diameter D2 of the second end 412. This setting ensures reasonable fluid diffusion, and the flow velocity of the hydraulic oil gradually decreases as it enters the second end 412 from the first end 411, preventing sudden changes in flow velocity and effectively avoiding eddy currents. This further ensures energy transfer efficiency. Furthermore, by coordinating the dimensions of the first end 411 and the second end 412, excessive stress concentration at their connection point can be avoided, reducing the probability of fatigue cracks under high-frequency vibration. Moreover, this parameter limitation results in a larger natural frequency difference between the first end 411 and the second end 412, with the high-frequency impact frequency falling between them and not coinciding, effectively suppressing resonance. If the inner diameter D1 of the first end 411 is less than 0.5 times the inner diameter D2 of the second end 412, then the first end 411 is too thin and easily gets stuck by particles with slightly larger diameters. At the same time, the diffusion efficiency is too high, and a large number of eddies are generated when the hydraulic oil flows through it, which greatly increases the pressure loss. In addition, the flow velocity at the outlet of the first end 411 is too high, and the pressure in the second end 412 cannot be effectively restored, which will create a local low-pressure area, resulting in the formation of bubbles. The rupture of the bubbles exacerbates the erosion problem of the inner wall of the oil passage 41. If D1 is greater than 0.7 times D2, then the natural frequency of the first end 411 decreases and coincides with the high-frequency impact frequency of the hydraulic breaker, resulting in resonance.

[0032] Specifically, such as Figure 1-2As shown, the inner wall of the oil cavity 2 is composed of several concave rings forming a wave-shaped structure, including a first concave ring 5, a second concave ring 6, and a third concave ring 7, all with arc cross-sections and connected sequentially from top to bottom along the axial direction of the oil cavity 2. By designing the inner wall of the oil cavity 2 as a wave-shaped structure, this application can effectively disperse stress concentration, reduce the stress concentration coefficient of the sidewall, and prevent fatigue cracks caused by stress concentration. Furthermore, the continuous wave-shaped curve can guide the oil to form laminar flow, reducing pressure loss caused by eddies. Moreover, the undulations of the wave shape can absorb the impact energy during hydraulic oil flow, effectively reducing the impact of frequent impacts from the hydraulic breaker on the accumulator and lowering the resonance risk during accumulator operation.

[0033] Specifically, such as Figure 1-2 As shown, a first protruding ring 8, which protrudes radially toward the axis of the oil cavity 2, is provided at the connection between the first concave ring 5 and the second concave ring 6. A second protruding ring 9, which protrudes radially toward the axis of the oil cavity 2, is provided at the connection between the second concave ring 6 and the third concave ring 7. This arrangement can significantly improve the deformation resistance of the inner wall of the oil cavity 2, thereby increasing the pressure bearing range of the accumulator by 30%, and can effectively reduce the local resistance coefficient, better guide the flow of hydraulic oil, and avoid the generation of eddies at the connection.

[0034] Preferred, such as Figure 2As shown, the relationship between the curvature radius r1 of the first concave ring 5, the curvature radius r2 of the second concave ring 6, and the curvature radius r3 of the third concave ring 7 satisfies: r1:r2:r3=(1.8-2.0):(1.2-1.4):1. This setup achieves the technical effects of uniform stress distribution, stable oil flow, and low diaphragm friction, solving the problems of stress concentration and fatigue cracking on the inner wall of the oil chamber 2 under high-frequency impact of the hydraulic breaker, energy loss due to oil transition eddies, and frictional damage between the diaphragm and the wall. Because the inner wall of the oil chamber 2 bears the high pressure of the accumulator and the high-frequency impact of the hydraulic breaker, setting the first concave ring 5 to the maximum radius of curvature reduces the stress concentration factor in the first concave ring 5 area by 50%. The second concave ring 6 and the third concave ring 7 act as transitions, allowing stress to be smoothly transmitted from top to bottom, ensuring uniform overall stress distribution. If the radius of curvature r1 of the first concave ring 5 is less than 1.8 times the radius of curvature r3 of the third concave ring 7, the stress concentration factor in the first concave ring 5 area increases, increasing the probability of fatigue cracking under high-frequency impact. Secondly... The radius of curvature affects the flow state of the oil. By setting the radius of curvature to decrease gradually, the cross-sectional area of ​​the flow channel decreases as the radius of curvature decreases. When the oil flows out of the accumulator, it can guide the oil flow velocity to gradually increase, avoiding sudden changes in flow velocity that can generate eddies. If r1 is greater than twice r2, the difference in cross-sectional area between the first concave ring 5 region and the second concave ring 6 region is too large, and the oil flow velocity will change suddenly, generating a large number of eddies. If r2 is less than 1.2 times r3, the increase in oil flow velocity is slowed down, and stagnation is easily formed in the second concave ring 6 region. Finally, the diaphragm deforms under high-frequency impact, and the contact friction with the sidewall is the main cause of diaphragm fatigue. Through this setting, the impact energy during the flow of hydraulic oil can be efficiently absorbed. While ensuring the energy storage of the diaphragm deformation, high-frequency friction between the diaphragm and the sidewall is avoided, effectively ensuring the service life of the diaphragm.

[0035] Preferably, the radius of curvature of the first convex ring 8 is 3-3.5 times that of the radius of curvature of the second convex ring 9. Because the oil cavity 2 is generally a reduced bowl shape, by setting the first convex ring 8 with a larger radius of curvature at the larger inner diameter position and the second convex ring 9 with a smaller radius of curvature at the smaller inner diameter position, it is possible to first further ensure the stress uniformity of the inner wall of the oil cavity 2 and balance the overall deformation resistance of the inner wall of the oil cavity 2. Secondly, it is possible to further reduce the local resistance coefficient and further ensure the stability of oil flow.

[0036] Specifically, such as Figure 3As shown, the oil passage 4 is a disc-shaped, wave-shaped structure that spreads outward from the center. It includes an inner concave ring 42 and an outer concave ring 43 arranged concentrically. The cross-sections of the inner concave ring 42 and the outer concave ring 43 are both arcs that are concave towards the lower surface of the bottom of the oil cavity 2, and the connection between the two is transitioned by a rounded corner. The outer concave ring 43 is connected to the third concave ring 7. The arc-shaped concave design of the inner and outer concave rings 43 increases the effective heat dissipation area of ​​the oil passage 4 by 20%-30% compared to the traditional planar structure, effectively improving heat dissipation performance. Furthermore, the concentric diffusion design of the inner and outer concave rings 43 guides slight boundary layer disturbances during oil flow, further enhancing heat dissipation performance. Secondly, the smooth transition with the third concave ring 7 ensures that the oil flow path is free of abrupt changes, effectively reducing turbulence. Finally, the wave-shaped structure effectively disperses stress concentration, reduces the stress concentration coefficient of the oil passage 4, and prevents fatigue cracks caused by stress concentration, further ensuring service life.

[0037] Preferably, the inner concave ring 42 and the outer concave ring 43 have the same radius of curvature, and their radii of curvature are 2.1-2.2 times that of the radius of curvature r3 of the third concave ring 7. By setting the inner concave ring and the outer concave ring 43 to have the same radius of curvature, the radial stress distribution of the oil passage 4 is made uniform. Furthermore, by limiting the parameters with the third concave ring 7, the stress abrupt change from the inner wall of the oil cavity 2 to the oil passage 4 is further reduced, avoiding fatigue damage under high-frequency impact and further extending the service life. Secondly, the same curvature can avoid local overflow of oil and ensure uniform flow velocity everywhere. The uniform flow velocity distribution allows all oil passage holes 41 to effectively transmit pressure, ensuring that the energy of the accumulator can be quickly and uniformly transferred to the breaker hammer and avoiding response delay.

[0038] Example 2:

[0039] An energy storage device includes a lower cover as described in Embodiment 1, an upper cover, and a diaphragm. The upper cover and the lower cover are fastened together by bolts passing through the threaded hole 3. The diaphragm is fixed within the cavity between the upper cover and the lower cover. It should be noted that the upper cover and the diaphragm are common knowledge in the art and are therefore not shown in the accompanying drawings.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are exhaustively listed. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] For those skilled in the art, various modifications and improvements can be made without departing from the concept of this utility model, and these modifications and improvements are all within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims.

Claims

1. A accumulator lower cover, characterized in that, include: The housing has a downwardly recessed middle section forming an oil cavity, and several threaded holes are arranged circumferentially around the oil cavity; The oil passage is located at the bottom of the oil cavity and includes a plurality of oil passage holes arranged in an array. Each oil passage hole is a stepped structure that penetrates the bottom of the oil cavity and includes a first end and a second end that are coaxial but have different diameters. The first end is connected to the upper surface of the bottom of the oil cavity, and the second end is connected to the lower surface of the bottom of the oil cavity. The inner diameter of the second end is larger than the inner diameter of the first end.

2. The accumulator lower cover according to claim 1, characterized in that, The inner diameter D1 of the first end is 0.5-0.7 times the inner diameter D2 of the second end.

3. The accumulator lower cover according to claim 1, characterized in that, The inner wall of the oil cavity is composed of a wave-shaped structure made up of several concave rings, including a first concave ring, a second concave ring, and a third concave ring, all of which have arc cross sections and are connected sequentially from top to bottom along the axial direction of the oil cavity.

4. The accumulator lower cover according to claim 3, characterized in that, The connection between the first concave ring and the second concave ring is provided with a first convex ring that protrudes radially toward the axis of the oil cavity, and the connection between the second concave ring and the third concave ring is provided with a second convex ring that protrudes radially toward the axis of the oil cavity.

5. The accumulator lower cover according to claim 4, characterized in that, The relationship between the curvature radius r1 of the first concave ring, the curvature radius r2 of the second concave ring, and the curvature radius r3 of the third concave ring satisfies: r1:r2:r3=(1.8-2.0):(1.2-1.4):

1.

6. The accumulator lower cover according to claim 5, characterized in that, The radius of curvature of the first convex ring is 3 to 3.5 times that of the radius of curvature of the second convex ring.

7. The accumulator lower cover according to claim 6, characterized in that, The oil passage is a disc-shaped, wave-shaped structure that spreads outward from the center. It includes an inner concave ring and an outer concave ring arranged concentrically. The cross-section of the inner and outer concave rings are both arcs that are concave towards the lower surface of the bottom of the oil cavity, and the connection between the two is transitioned by a rounded corner. The outer concave ring is connected to the third concave ring.

8. The accumulator lower cover according to claim 7, characterized in that, The inner concave ring and the outer concave ring have the same radius of curvature, and their radii of curvature are 2.1-2.2 times that of the radius of curvature r3 of the third concave ring.

9. An energy storage device, characterized in that, The accumulator includes the lower cover as described in any one of claims 1-8, and also includes an upper cover and a diaphragm, wherein the upper cover and the lower cover are fastened together by bolts passing through the threaded hole, and the diaphragm is fixed in the cavity between the upper cover and the lower cover.

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