A three-stage welded accumulator

Abstract

The utility model discloses a kind of three-section type welding's accumulators, belong to accumulator technical field.It aims to solve the technical problem that vibration plate is easily damaged due to high temperature in the welding process of existing accumulator.The utility model includes upper cover, lower cover and the vibration plate being set between the two;Its key is that: upper cover bottom is welded with upper fixed ring by upper cover stop mouth, lower cover top is welded with lower fixed ring by lower cover stop mouth;Vibration plate is clamped and fixed between upper and lower fixed ring.The lower edge of upper fixed ring is higher than the lower edge of upper cover, the upper edge of lower fixed ring is higher than the upper edge of lower cover, so that the main weld that finally welds upper cover and lower cover together is away from vibration plate.The utility model is added fixed ring, using three-section type welding process, effectively extend the distance between main weld and vibration plate, insulate the conduction of welding heat, protect vibration plate, significantly improve the reliability and service life of product, while optimizing the convenience of assembly positioning.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to an energy storage device with a three-section welded design. Background Technology

[0002] Accumulators, as important hydraulic components, are widely used in hydraulic systems for functions such as storing energy, absorbing pulsations, compensating for leaks, and maintaining stable system pressure. Traditional accumulators typically employ a welded structure design, such as diaphragm accumulators, where the main body consists of an upper and lower shell fixedly connected by welding. A vibrating plate is usually placed between the upper and lower shells and is made of flexible materials such as rubber to isolate the gas from the hydraulic oil. This structure relies on welding processes during production to ensure the sealing and strength of the shell, such as electron beam welding or traditional fusion welding methods.

[0003] However, existing welding technologies have significant drawbacks. During the welding process, the local temperature at the weld joint is often excessively high, which may cause heat deformation, aging, or direct damage to the edge of the vibratory plate, thus affecting the sealing performance and service life of the accumulator. For example, in a welded diaphragm accumulator disclosed in patent CN201396323Y, although the problems of complex structure, large size, and high production cost are solved, no effective solution is proposed for the potential damage to the vibratory plate caused by high welding temperatures. This patent mainly focuses on optimizing the shell structure, while ignoring the negative impact of high temperature conduction on the rubber vibratory plate. Similarly, the welding production process of the diaphragm accumulator disclosed in patent CN101879655B describes the application of metal welding technology in accumulator production, but welding defects in its process, such as uneven penetration or an excessively large heat-affected zone, may still lead to material deterioration at the edge of the vibratory plate, causing premature failure of the accumulator. In addition, English literature also mentions the production method of welded joints for hydraulic accumulators, but emphasizes the defects that may be caused by welding applications, including material damage caused by thermal stress, without addressing specific protective measures for the vibratory plate.

[0004] Another limitation of existing technology is that, although some patents, such as WO2017201707A1, discuss manufacturing defects in accumulator capsules and their causes, these defects often stem from the heat effects of traditional welding processes, and no technical solution is disclosed to avoid high-temperature problems by extending the distance between the vibrating plate and the welding point. This deficiency makes it difficult to further improve the production efficiency and reliability of traditional accumulators, especially in high-precision or high-temperature sensitive applications, where vibrating plate damage is prone to occur, thereby increasing maintenance costs and safety hazards.

[0005] Therefore, it is necessary to provide a novel accumulator structure design to avoid the direct impact of high welding temperatures on the vibrating plate, thereby improving production reliability and product lifespan. This invention achieves effective isolation between the vibrating plate and the welding points through a three-section welding method, thus overcoming the shortcomings of the prior art. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a three-section welded energy accumulator. Through two additional welds, a vibration plate fixing block made of a non-thermal conductive metal material is welded to the upper and lower covers respectively. The vibration plate fixing block extends the distance between the vibration plate and the weld point. In addition, the use of a non-thermal conductive metal material can reduce the efficiency of heat conduction and further reduce the impact of welding on the vibration plate.

[0007] To achieve the above objectives, this application discloses a three-section welded accumulator, including an upper cover, a lower cover, and a vibrating plate disposed between the upper and lower covers. The bottom of the upper cover is provided with an upper cover stop, and an upper fixing ring is welded to the upper cover stop. The top of the lower cover is provided with a lower cover stop, and a lower fixing ring is welded to the lower cover stop. The lower edge of the upper fixing ring is higher than the lower edge of the upper cover, and the upper edge of the lower fixing ring is higher than the upper edge of the lower cover. The vibrating plate is fixed in the inner cavity formed by the closing of the upper and lower covers by the upper and lower fixing rings, and the vibrating plate divides the inner cavity of the upper and lower covers into a pressure chamber and a hydraulic oil chamber. The top of the upper cover is provided with an air filling / draining hole communicating with the pressure chamber, and the bottom of the lower cover is provided with a hydraulic oil hole communicating with the hydraulic oil chamber. The height difference between the upper and lower fixing rings not only staggers the interface between the upper and lower fixing rings and the weld between the upper and lower covers, but also facilitates the positioning of the upper and lower covers by the protruding lower fixing ring.

[0008] Furthermore, the lower surface of the upper fixing ring is a plane, and the upper surface of the lower fixing ring includes a planar segment, a positioning groove, and a rounded corner segment arranged from the outside to the inside. The horizontal height of the planar segment is higher than that of the positioning groove and the rounded corner segment.

[0009] Furthermore, the edge of the vibrating plate is provided with a positioning ring, which is disposed in the positioning groove and pressed by the lower surface of the upper fixing ring.

[0010] Furthermore, the positions of the air filling / draining hole and the hydraulic oil hole are provided with internal threads and / or external threads.

[0011] Furthermore, the inflation / deflation port is sealed by a threaded sealing pin or a sealing cap.

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

[0013] Furthermore, the reinforcing part is configured to have a protective sheet embedded or pasted in it.

[0014] Furthermore, the protective sheet is a nylon sheet. Compared with the prior art, the present invention achieves the following significant beneficial effects through its innovative structural design: Effectively insulates welding heat and protects the vibrating plate: The core of this invention lies in its three-stage welding process. First, the upper and lower fixing rings are welded to the upper and lower covers respectively. Finally, the upper and lower covers are circumferentially welded together. Due to the fixing rings, a sufficient safe distance is maintained between the final main weld seam of the shell and the edge of the vibrating plate. Furthermore, the fixing rings can be made of a metal material with low thermal conductivity. This dual effect greatly reduces the conduction of heat generated during welding to the vibrating plate, fundamentally avoiding the risk of deformation, aging, or damage to the vibrating plate due to high temperatures, and significantly improving the product's yield and reliability.

[0015] Improving assembly accuracy and convenience: In the design, the upper edge of the lower fixing ring is higher than the upper edge of the lower cover, forming a boss structure. When the upper and lower covers are assembled together, this boss serves as a precise positioning reference, facilitating quick centering of the upper cover, simplifying the assembly process, and improving production efficiency. Simultaneously, the positioning groove on the lower fixing ring cooperates with the positioning ring on the vibrating plate, ensuring the precise positioning of the vibrating plate during assembly and avoiding eccentricity or displacement issues.

[0016] The vibrating plate is firmly pressed together by the upper and lower fixing rings, forming a reliable initial seal. The plane of the upper fixing ring and the plane segment of the lower fixing ring work together to provide uniform clamping force to the edge of the vibrating plate. Compared with the traditional structure that relies solely on the natural clamping of the welded shell, this mechanical clamping structure offers superior sealing performance and long-term reliability.

[0017] The bottom center of the vibratory plate protrudes upward and is reinforced. In particular, by attaching or embedding nylon protective sheets, it can effectively prevent the vibratory plate from directly contacting and rubbing against the edge of the hydraulic oil hole during operation, avoiding wear or puncture caused by high-pressure oil impact or reciprocating motion, thereby extending the overall service life of the accumulator. Attached Figure Description

[0018] 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.

[0019] Figure 1This is a schematic diagram of the structure of a three-section welded energy storage device according to the present invention.

[0020] Figure 2 This is a schematic cross-sectional view of the structure of a three-section welded accumulator according to the present invention.

[0021] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0022] The markings in the diagram are: 1-upper cover, 11-upper cover stop, 12-pressure chamber; 2-lower cover, 21-lower cover stop, 22-hydraulic oil chamber; 3-vibrating plate, 31-positioning ring, 32-reinforcing part; 4-upper fixing ring; 5-lower fixing ring, 51-flat section, 52-positioning groove, 53-rounded corner section; 6-air filling / deleting hole; 7-hydraulic oil hole. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-3 This utility model discloses a three-section welding accumulator, which aims to solve the problem that the vibration plate is easily damaged by high temperature during the welding of accumulators in the prior art.

[0025] The accumulator mainly consists of an upper cover 1, a lower cover 2, and a vibrating plate 3 sandwiched between them. The upper cover 1 and the lower cover 2 together form a sealed inner cavity. The vibrating plate 3 is made of elastic materials such as rubber, and it divides the inner cavity into an upper pressure chamber 12 and a lower hydraulic oil chamber 22. An inflation / deflation port 6, connected to the pressure chamber 12, is located at the center of the top of the upper cover 1, for inflating or deflating the pressure chamber 12. A hydraulic oil port 7, connected to the hydraulic oil chamber 22, is located at the center of the bottom of the lower cover 2, for connecting to the hydraulic system.

[0026] The key structure of this utility model lies in the introduction of an upper fixing ring 4 and a lower fixing ring 5.

[0027] Specifically, the bottom opening edge of the upper cover 1 has an inwardly tapering step, forming an upper cover stop 11. An annular upper fixing ring 4 is fixed to the upper cover stop 11 by welding, for example, laser welding or electron beam welding. Similarly, the top opening edge of the lower cover 2 also has an inwardly tapering step, forming a lower cover stop 21, and an annular lower fixing ring 5 is fixed to the lower cover stop 21 by welding. These two welding processes are preliminary steps in the accumulator assembly. The upper fixing ring 4 and the lower fixing ring 5 are preferably made of a metal with a lower thermal conductivity than the main body materials of the upper cover 1 and the lower cover 2, such as stainless steel, while the shell can be made of carbon steel, thereby forming a thermal barrier between the heat source and the vibrating plate.

[0028] In terms of structural layout, the lower edge of the upper fixing ring 4 is higher than the lower edge of the upper cover 1, while the upper edge of the lower fixing ring 5 is higher than the upper edge of the lower cover 2. This design ensures that when the upper cover 1 and the lower cover 2 are finally welded together, the main weld seam is located outside the fixing ring, separated from the vibrating plate 3 by the width and height of the fixing ring, which greatly extends the heat conduction path.

[0029] Please refer to this document. Figure 2 To achieve precise positioning and reliable sealing of the vibrating plate 3, the lower surface of the upper fixing ring 4 is designed as a flat plane. The upper surface of the lower fixing ring 5 has a special cross-sectional profile, consisting of a flat section 51, a positioning groove 52, and a rounded corner section 53, arranged sequentially from the outer diameter to the inner diameter. A thickened positioning ring 31 is integrally formed on the edge of the vibrating plate 3. During assembly, the positioning ring 31 of the vibrating plate 3 is precisely embedded into the positioning groove 52 of the lower fixing ring 5. Then, the upper cover 1, along with the upper fixing ring 4 welded to it, is closed. The lower surface of the upper fixing ring 4 presses against the upper surface of the positioning ring 31 of the vibrating plate 3, and together with the flat section 51 of the lower fixing ring 5, firmly presses and seals the edge of the vibrating plate 3.

[0030] After the above assembly is completed, the third welding process is performed, which is to perform circumferential welding along the mating edges of the upper cover 1 and the lower cover 2 to permanently seal and connect the two into a whole. Since this weld is far from the vibrating plate 3 and is separated by a low thermal conductivity fixing ring, most of the high temperature generated by the welding will be conducted and dissipated along the shell, and will hardly cause any thermal damage to the vibrating plate 3.

[0031] In a preferred embodiment, both the vent hole 6 and the hydraulic oil hole 7 are provided with internal or external threads for easy connection to external pipelines or valves. After inflation, the vent hole 6 can be reliably sealed with a threaded sealing pin or cap to prevent gas leakage.

[0032] To further improve the durability of the vibrating plate 3, its bottom central area is designed to bulge upwards, and a reinforcing part 32 is provided on the top surface of the bulge. This reinforcing part 32 can be made by increasing the thickness of the rubber substrate, or more preferably by embedding or pasting a wear-resistant protective sheet, such as a nylon sheet. This protective sheet faces the hydraulic oil hole 7 below, which can effectively resist the direct impact of high-pressure oil and prevent the vibrating plate from rubbing against the metal edge of the hydraulic oil hole 7 when reciprocating to the limit position, thereby significantly extending the service life of the accumulator.

[0033] When the accumulator of this invention is working, an inert gas, such as nitrogen, is charged into the pressure chamber 12 at a certain pressure through the charging / discharging port 6. When the hydraulic system pressure increases, hydraulic oil enters the hydraulic oil chamber 22 through the hydraulic oil port 7, compresses the gas, and stores energy; when the system pressure decreases, the compressed gas expands, pushing the vibrating plate 3 to discharge the stored hydraulic oil back into the system, thus compensating for pressure and absorbing pulsations.

[0034] 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 three-section welded accumulator, comprising an upper cover (1), a lower cover (2), and a vibrating plate (3) disposed between the upper cover (1) and the lower cover (2), characterized in that: The bottom of the upper cover (1) is provided with an upper cover stop (11), and an upper fixing ring (4) is welded on the upper cover stop (11). The top of the lower cover (2) is provided with a lower cover stop (21), and a lower fixing ring (5) is welded on the lower cover stop (21). The lower edge of the upper fixing ring (4) is higher than the lower edge of the upper cover (1), and the upper edge of the lower fixing ring (5) is higher than the upper edge of the lower cover (2). The vibrating plate (3) is fixed in the inner cavity formed by the upper cover (1) and the lower cover (2) through the upper fixing ring (4) and the lower fixing ring (5), and the inner cavity of the upper cover (1) and the lower cover (2) is divided into a pressure chamber (12) and a hydraulic oil chamber (22) through the vibrating plate (3). The top of the upper cover (1) is provided with an air filling and emptying hole (6) communicating with the pressure chamber (12), and the bottom of the lower cover (2) is provided with a hydraulic oil hole (7) communicating with the hydraulic oil chamber (22).

2. The energy storage device with three-section welding according to claim 1, characterized in that: The lower surface of the upper fixing ring (4) is a plane, and the upper surface of the lower fixing ring (5) includes a plane segment (51), a positioning groove (52) and a rounded corner segment (53) arranged from the outside to the inside. The horizontal height of the plane segment (51) is higher than that of the positioning groove (52) and the rounded corner segment (53).

3. The energy storage device with three-section welding according to claim 2, characterized in that: The edge of the vibrating plate (3) is provided with a positioning ring (31), which is located in the positioning groove (52) and pressed by the lower surface of the upper fixing ring.

4. The energy storage device with three-section welding according to claim 1, characterized in that: The air inlet / outlet (6) and hydraulic oil inlet (7) are provided with internal and / or external threads.

5. The energy storage device with three-section welding according to claim 4, characterized in that: The inflation / deflation port (6) is sealed by a threaded sealing pin or sealing cap.

6. The energy storage device with three-section welding according to claim 1, characterized in that: The bottom center of the vibrating plate (3) protrudes upward, and a reinforcing part (32) is provided on the top surface of the protrusion.

7. The energy storage device with three-section welding according to claim 6, characterized in that: The reinforcing part (32) is configured to have a protective sheet embedded or pasted in it.

8. The energy storage device with three-section welding according to claim 7, characterized in that: The protective sheet is made of nylon.

9. The energy storage device with three-section welding according to claim 1, characterized in that: The upper fixing ring (4) and the lower fixing ring (5) are austenitic stainless steel rings.

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