A bolted accumulator

Abstract

The utility model discloses a bolt connection type energy accumulator, which aims to solve the technical problem of diaphragm damage caused by the relative displacement of upper cover and lower cover during the assembly of traditional bolt connection type energy accumulator. The energy accumulator comprises an upper cover, a lower cover and a diaphragm. The upper cover is provided with a gas charging and discharging port, and the lower cover is provided with a hydraulic oil hole. The diaphragm divides the internal space into a pressure chamber and a hydraulic oil chamber. The upper cover and the lower cover are connected by flanges and fastened by bolts. The lower surface of the upper cover flange is provided with a positioning protrusion in the form of an inverted round table structure, and the upper surface of the lower cover flange is provided with a matching positioning counterbore. This arrangement realizes accurate pre-positioning during assembly and avoids uneven stretching or shearing stress on the diaphragm. In addition, the diaphragm edge is provided with a positioning sealing ring matched with the positioning groove of the lower cover, and the center is provided with a reinforcing part and a nylon protective sheet, which enhances the sealing performance and wear resistance. The design significantly prolongs the service life of the diaphragm, improves the reliability and assembly efficiency of the energy accumulator, and has high practical value.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a bolt-connected energy storage device. Background Technology

[0002] Accumulators are crucial components widely used in hydraulic systems. Their main functions include storing pressure energy, absorbing pressure pulsations, eliminating hydraulic shocks, and serving as an emergency power source. Depending on the energy storage method, accumulators can be classified into various types, such as piston-type, pneumatic bladder-type, and diaphragm-type. Among these, diaphragm-type accumulators are widely used in machinery, automobiles, and various automated equipment due to their relatively simple structure, sensitive response, and good sealing performance.

[0003] In existing diaphragm or vibratory plate accumulator designs, a common structural configuration involves bolting the upper and lower covers together. The edge of the vibratory plate (or diaphragm) is clamped between the flange mating surfaces of the upper and lower covers, thus dividing the accumulator interior into a gas chamber and a liquid chamber. This structure offers advantages such as reliable connection, high pressure resistance, and ease of disassembly and maintenance.

[0004] However, those skilled in the art have discovered in practice that the aforementioned traditional bolt-connected accumulators have a common and unavoidable technical defect during assembly: during the tightening of multiple bolts to press the upper and lower covers together, because it is difficult to ensure that the preload of all bolts is applied synchronously and uniformly at the same time, slight and uneven relative sliding or torsion will occur between the upper and lower covers and the contact surface of the vibrating plate before they are finally pressed into place. This relative displacement will cause uneven tensile, compressive, or shear stress on the thin and precise vibrating plate.

[0005] The initial stress and deformation generated during the assembly stage alter the natural state of the vibrating plate. Uneven stress concentration can become a weak point of the vibrating plate. After being subjected to high-frequency pressure alternating loads for a long time, it is very easy to induce fatigue cracks, thereby greatly shortening its service life and causing the accumulator to fail prematurely.

[0006] Therefore, how to optimize the structural design of bolt-connected accumulators, fundamentally eliminate or reduce the relative displacement of the braided plate during the fastening process, and avoid harmful initial deformation and stress concentration, has become a pressing technical problem to be solved in this field. Utility Model Content

[0007] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a bolt-connected accumulator, which avoids the problem of diaphragm deformation caused by directly connecting the upper and lower covers with bolts by redesigning the bolt connection part.

[0008] To achieve the above objectives, this application discloses a bolt-connected accumulator, including an upper cover and a lower cover. The upper cover includes an inflation / deflation port. A diaphragm is disposed between the upper and lower covers, inside the lower cover, and divides the interior of the upper and lower covers into a pressure chamber and a hydraulic oil chamber, respectively. An upper cover flange extends outward from the lower edge of the upper cover, and a lower cover flange extends outward from the upper edge of the lower cover. The upper and lower cover flanges are fastened together by bolts. A hydraulic oil hole communicating with the hydraulic oil chamber is provided at the bottom of the lower cover. At least two sets of positioning protrusions are provided on the lower surface of the upper cover flange. The positioning protrusions have an inverted frustum structure with a height of 2-5 mm. A positioning countersunk hole matching the positioning protrusion is provided on the lower cover flange. The positioning protrusions with inverted frustum structures and the positioning countersunk holes assist in the pre-fitting of the upper and lower covers, facilitating subsequent bolt tightening.

[0009] Furthermore, the air inlet / outlet and hydraulic oil hole positions are provided with internal and / or external threads.

[0010] Furthermore, the inflation / deflation port is sealed by a threaded sealing pin.

[0011] Furthermore, a diaphragm positioning groove is provided on the lower cover flange of the lower cover, and an enlarged positioning sealing ring is provided on the edge of the diaphragm. The positioning sealing ring is located in the diaphragm positioning groove and abuts against the surface of the upper cover flange after the accumulator is assembled.

[0012] Furthermore, the center of the bottom of the diaphragm protrudes upwards, and a reinforcing part is provided on the top surface of the protrusion.

[0013] Furthermore, the thickness of the reinforcing portion is at least twice the thickness of the diaphragm body.

[0014] Furthermore, the reinforcing part is configured to have a protective sheet embedded or pasted in it.

[0015] Furthermore, the protective sheet is a nylon sheet. Furthermore, the taper of the positioning protrusion is 1:2.

[0016] Compared with the prior art, the present invention achieves the following significant beneficial effects through its innovative structural design: Precise positioning, eliminating installation stress: The core of this invention lies in the mating structure of the positioning protrusion on the upper flange and the positioning countersunk hole on the lower flange. Before tightening the bolts, the truncated cone-shaped positioning protrusion slides into the positioning countersunk hole, achieving precise radial and circumferential pre-positioning of the upper and lower covers. This pre-positioning process occurs before the flange face contacts the diaphragm, thus completely eliminating any relative torsion or sliding that may occur between the upper and lower covers and the diaphragm during bolt tightening. This fundamentally avoids uneven initial tensile and shear stress on the diaphragm, protecting its original physical state and laying the foundation for extending its fatigue life.

[0017] Improved service life and reliability: By eliminating harmful stress concentrations generated during installation, the diaphragm experiences more even stress during the working cycle, making it less prone to localized fatigue cracks. Therefore, the service life of the diaphragm in this accumulator is significantly extended, enhancing the overall reliability and safety of the device and reducing downtime and maintenance costs caused by premature accumulator failure.

[0018] Simplified assembly process and improved production efficiency: The guiding function of the positioning protrusions and countersunk holes makes the alignment of the upper and lower covers simple and quick, reducing the skill requirements for operators. Assembly personnel can quickly complete the alignment without repeatedly adjusting the position, and subsequent bolt tightening is also smoother, thereby effectively improving assembly efficiency and ensuring the consistency of product quality.

[0019] Enhanced sealing and protection performance: By incorporating a diaphragm positioning groove on the lower flange, which mates with the positioning sealing ring on the diaphragm edge, the diaphragm's position can be more precisely fixed. Furthermore, a more reliable sealing structure is formed after the flange is tightened, effectively preventing gas and liquid cross-contamination. Simultaneously, the reinforcing section at the center of the diaphragm, particularly the structure with a nylon protective sheet, significantly enhances the diaphragm's wear and impact resistance under extreme movement conditions, further improving the product's durability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is an overall structural diagram of a bolt-connected accumulator according to this utility model.

[0022] Figure 2 This is a cross-sectional view of the overall structure of a bolt-connected accumulator according to this utility model.

[0023] Figure 3 This is a schematic diagram of the structure for positioning protrusions.

[0024] Figure 4 This is a schematic diagram of the positioning countersunk hole.

[0025] Figure 5 This is a schematic diagram of the diaphragm structure in this utility model.

[0026] In the diagram: 1-Upper cover, 2-Lower cover, 3-Diaphragm, 4-Inflation / Depression port, 5-Bolt, 6-Hydraulic oil hole, 11-Pressure chamber, 12-Upper cover flange, 13-Positioning protrusion, 21-Hydraulic oil tank, 22-Lower cover flange, 23-Positioning countersunk hole, 24-Diaphragm positioning groove, 31-Positioning sealing ring, 32-Reinforcing part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-5 This utility model provides a bolt-connected accumulator, including an upper cover 1, a lower cover 2, and a diaphragm 3 disposed between the two.

[0029] The top of the upper cover 1 has a charging / discharging port 4 for pre-charging inert gas, forming a pressure chamber 11 inside. The bottom of the lower cover 2 has a hydraulic oil port 6 for connecting to an external hydraulic system, forming a hydraulic oil chamber 21 inside. A diaphragm 3 completely separates the pressure chamber 11 from the hydraulic oil chamber 21. The lower edge of the upper cover 1 extends outward to form an upper cover flange 12, and the upper edge of the lower cover 2 extends outward to form a lower cover flange 22. The upper cover flange 12 and the lower cover flange 22 are fastened together by a plurality of bolts 5 evenly distributed circumferentially.

[0030] The key improvement of this utility model lies in, such as combining Figures 1-4 As shown, on the lower surface of the upper flange 12 facing the lower flange 22, at least two sets (usually 2-4 sets, evenly distributed circumferentially) of positioning protrusions 13 are integrally formed or additionally provided. Each set of positioning protrusions 13 is designed as an inverted frustum structure, that is, the diameter of the upper end face is larger than the diameter of the lower end face (the root connected to the flange), and its taper is preferably 1:2. The height of the positioning protrusions 13 is designed to be between 2mm and 5mm. Correspondingly, on the upper surface of the lower flange 22, positioning countersunk holes 23 are provided that perfectly match the positioning protrusions 13 in position, number, and shape.

[0031] During assembly, first place the diaphragm 3 on the lower cover 2. (See also...) Figure 5 The diaphragm 3's bulging edge positioning sealing ring 31 accurately falls into the pre-set annular diaphragm positioning groove 24 on the lower cover flange 22, achieving initial positioning. Then, the upper cover 1 is aligned with the lower cover 2 and lowered. At this time, the tapered slope of the positioning protrusion 13 on the upper cover flange 12 guides itself to slide precisely into the positioning countersunk hole 23 of the lower cover flange 22. Due to the height design of the positioning protrusion 13 (2-5mm), when the positioning protrusion 13 and the positioning countersunk hole 23 are fully engaged, achieving axial alignment and circumferential locking of the upper cover 1 and lower cover 2, the lower surface of the upper cover flange 12 still has a certain gap or just makes contact with the diaphragm 3's positioning sealing ring 31, and no substantial clamping force has yet been generated.

[0032] In this pre-positioned state, the relative positions of the upper cover 1 and the lower cover 2 are completely fixed, preventing any relative rotation or translation. Afterwards, the assembler inserts the bolts 5 into the bolt holes on the flange and tightens them. Throughout the entire bolt tightening process, as the flange faces are gradually pulled closer until the diaphragm 3 is fully compressed, the pre-positioning structure prevents any relative displacement between the upper cover 1 and the lower cover 2. This ensures that the diaphragm 3 only bears uniform vertical compressive stress and is not subjected to any torsional or shear forces, effectively preventing internal damage during installation.

[0033] To further improve the performance of the accumulator, this invention also optimizes the diaphragm 3 itself. As mentioned earlier, the positioning sealing ring 31 at its edge cooperates with the diaphragm positioning groove 24 on the lower cover flange 22, improving positioning accuracy and sealing reliability. Meanwhile, as... Figure 5 As shown, a reinforcing section 32 protrudes upwards in the area directly opposite the hydraulic oil hole 6 at the center of the diaphragm 3. The thickness of this reinforcing section 32 is designed to be more than twice the thickness of the diaphragm body, and a wear-resistant nylon protective sheet can be attached or embedded on its top surface. When the hydraulic oil in the accumulator is completely discharged, and the gas in the pressure chamber 11 pushes the diaphragm 3 to its limit position, the reinforcing section 32 with the nylon sheet contacts the inner wall of the lower cover 2, effectively preventing wear on the diaphragm or damage from pressure at the edge of the oil hole, significantly enhancing its durability.

[0034] During operation, nitrogen gas at a certain pressure is pre-charged into the pressure chamber 11 through the inflation / deflation port 4 and then sealed with a threaded sealing pin. Hydraulic oil enters or flows out of the hydraulic oil chamber 21 through the hydraulic oil port 6, causing the diaphragm 3 to move up and down between the pressure chamber 11 and the hydraulic oil chamber 21, thereby achieving energy storage and release, or absorbing pressure pulsations in the system.

[0035] In summary, this utility model cleverly solves the technical problem of diaphragm damage caused by relative displacement of the upper and lower covers during the assembly process of traditional bolt-connected accumulators by adding positioning protrusions and positioning countersunk holes with an inverted truncated cone structure. This significantly improves the service life and reliability of the product, while simplifying the assembly process. It has high practical value and promising prospects for promotion.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A bolt-connected accumulator, comprising an upper cover (1) and a lower cover (2), characterized in that: The upper cover (1) includes an air inlet / outlet (4) disposed on the upper cover. A diaphragm (3) is disposed between the upper cover (1) and the lower cover (2). The diaphragm (3) is disposed inside the lower cover (2) and divides the interior of the upper cover (1) and the lower cover (2) into a pressure chamber (11) and a hydraulic oil chamber (21) through the diaphragm (3). An upper cover flange (12) is disposed on the lower edge of the upper cover (1) extending outward, and a lower cover flange (22) is disposed on the upper edge of the lower cover (2) extending outward. The upper cover flange (12) and the lower cover flange (22) are fastened together by bolts (5). The bottom of the lower cover (2) is provided with a hydraulic oil hole (6) that communicates with the hydraulic oil tank (21). At least two sets of positioning protrusions (13) are provided on the lower surface of the upper cover flange (12). The positioning protrusions (13) are inverted frustum structures with a height of 2~5mm. The lower cover flange (22) is provided with positioning countersunk holes (23) that match the positioning protrusions (13).

2. The bolt-connected accumulator according to claim 1, characterized in that: The air inlet / outlet (4) and hydraulic oil hole (6) are provided with internal and / or external threads.

3. The bolt-connected accumulator according to claim 1, characterized in that: The inflation / deflation port (4) is sealed by a threaded sealing pin.

4. A bolt-connected accumulator according to claim 1, characterized in that: The lower cover (2) has a diaphragm positioning groove (24) on its lower cover flange (22). The edge of the diaphragm (3) is provided with an enlarged positioning sealing ring (31). The positioning sealing ring is located in the diaphragm positioning groove (24) and abuts against the surface of the upper cover flange (12) after the accumulator is assembled.

5. A bolt-connected accumulator according to claim 1, characterized in that: The diaphragm (3) has a raised center at its bottom center, and a reinforcing part (32) is provided on the top surface of the raised part.

6. A bolt-connected accumulator according to claim 5, characterized in that: The thickness of the reinforcing part (32) is at least twice the thickness of the diaphragm (3) body.

7. A bolt-connected accumulator according to claim 5, characterized in that: The reinforcing part (32) is configured to have a protective sheet embedded or pasted in it.

8. A bolt-connected accumulator according to claim 7, characterized in that: The protective sheet is a nylon sheet.

9. A bolt-connected accumulator according to claim 1, characterized in that: The taper of the positioning protrusion is 1:2.

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