An accumulator suitable for electron beam welding

Abstract

The utility model discloses an energy accumulator suitable for electron beam welding belongs to energy accumulator technical field. The energy accumulator includes upper cover, lower cover and the vibration plate of setting between both, and upper cover and lower cover are connected through the cooperation of the mouthful, and the mouthful includes the upper inclined plane and lower inclined plane of mutual cooperation, and the outside cooperation of both forms the welding opening. Its core lies at, on the upper inclined plane and / or lower inclined plane, namely the heat conduction path between the welding opening and vibration plate fixed edge, is provided with one or more annular grooves. The annular groove forms the effective heat barrier on the structure, and the heat conduction path is prolonged and the heat flow cross section is reduced, and the conduction of welding heat to the vibration plate is obviously hindered. The utility model discloses through simple structure improvement, and the core component is effectively protected, and the reliability, sealing performance and service life of energy accumulator are obviously improved, and the process is simplified, and the production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to an energy storage device suitable for electron beam welding. Background Technology

[0002] Hydraulic accumulators, as important energy storage and buffering devices in hydraulic systems, are widely used in engineering machinery, aerospace, shipbuilding, automotive, and industrial automation. Their main functions are to absorb pressure pulsations in the system, compensate for volume changes, provide emergency power, or achieve energy recovery by storing hydraulic oil or gas.

[0003] In the manufacturing process of accumulators, shell welding is one of the key steps. Traditional welding methods, such as argon arc welding or resistance welding, often involve high heat input, resulting in a wide heat-affected zone, which can easily lead to shell deformation, residual stress, and material property degradation. In contrast, electron beam welding, as a high-energy-density welding technology, has significant advantages: it uses a high-speed electron beam in a vacuum environment to bombard the workpiece surface, instantly generating high temperatures to melt the base material and form a weld. Electron beam welding has low heat input, a high weld depth-to-width ratio, a narrow heat-affected zone, and a fast welding speed, and it eliminates oxidation and contamination problems. These characteristics make electron beam welding particularly suitable for welding accumulator shells with high precision and high strength requirements. According to existing patent documents such as CN101879655A, electron beam welding has been successfully applied to the production of diaphragm accumulators. It uses a vacuum-focused beam to melt the base material, avoiding the undercut defects of traditional welding and improving the product's pressure resistance and volume utilization. However, existing electron beam welding technology still has several drawbacks and limitations in accumulator manufacturing. First, although the heat-affected zone of electron beam welding is narrow, the radiative, convective, and conductive heat generated during the welding process can still be conducted to the vibrating plate through the interior of the shell. The diaphragm material is typically an elastomer with a low temperature limit; high-temperature exposure can lead to diaphragm softening, aging, cracking, or permanent deformation, thus affecting the accumulator's sealing performance, response sensitivity, and service life.

[0004] According to the description of patent CN116748683A, while laser welding can be used as an alternative under normal circumstances, the vacuum requirements of electron beam welding remain a bottleneck for its widespread adoption. Furthermore, in high-pressure or high-temperature applications, existing accumulators are susceptible to thermal stress, leading to high fatigue failure rates and failing to meet the stringent requirements of fields such as power steering in electric vehicles or cushioning in engineering machinery.

[0005] In summary, while existing electron beam welding technology for hydraulic accumulators offers advantages in precision and strength, it suffers from drawbacks such as adverse effects of heat conduction on the diaphragm and structural complexity. These issues limit the application of accumulators in high-end fields, necessitating a novel structural design to optimize thermal management and improve overall performance and cost-effectiveness. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide an energy accumulator suitable for laser welding. This energy accumulator forms an effective thermal barrier by processing annular grooves or channels on the inner wall of the housing, thereby blocking the influence of radiative heat, convective heat and conductive heat during the welding process on the vibrating plate, achieving efficient protection and improving the reliability and lifespan of the product.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: An energy accumulator suitable for electron beam welding includes an upper cover, a lower cover, and a vibrating plate disposed between the upper cover and the lower cover. The inner side of the bottom of the upper cover is provided with an upper cover stop, and the outer side of the top of the lower cover is provided with a lower cover stop. The upper cover stop includes a first upper plane horizontally disposed at the top, a second upper plane disposed at the bottom, and an upper inclined surface connecting the first upper plane and the second upper plane. The lower cover stop includes a positioning groove disposed on the outer side of the upper part, a lower plane disposed at the bottom, and a lower inclined surface connecting the positioning groove and the lower plane on the side. The first upper plane, the upper inclined surface, and the positioning groove together form a space for accommodating the fixed side of the vibrating plate. After the upper cover and the lower cover are assembled, the upper inclined surface and the lower inclined surface cooperate, and the second upper plane and the lower plane cooperate to form a weld joint. An annular groove is provided on the upper inclined surface and / or the lower inclined surface.

[0008] Furthermore, the inner cavity formed by the closing of the upper and lower covers is divided into a pressure chamber and a hydraulic oil chamber by a vibrating plate. The top of the upper cover is provided with an air filling and releasing 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.

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

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

[0011] Furthermore, the bottom center of the vibrating plate protrudes upwards, and a reinforcing part is provided on the top surface of the protrusion.

[0012] Furthermore, the reinforcing part is configured to have a protective sheet embedded or pasted in it.

[0013] Furthermore, the protective sheet is a nylon sheet. Furthermore, the depth of the annular groove is 1-3 mm and the width is 1-3 mm.

[0014] Furthermore, the annular grooves on the upper inclined surface and the annular grooves on the lower inclined surface are staggered.

[0015] Compared with the prior art, the present invention achieves the following significant beneficial effects through its innovative structural design: Excellent thermal insulation performance: The key to this invention lies in the annular groove set on the inclined surface of the upper / lower cover mating. This groove structurally creates a weak point in heat conduction, significantly increasing the heat conduction path length from the weld joint to the fixed edge of the vibrating plate, and greatly reducing the cross-sectional area through which heat flows. The air or vacuum inside the groove (in the electron beam welding environment) is a poor conductor of heat, forming an effective "thermal barrier" that efficiently blocks most of the heat generated during welding from being conducted into the accumulator, thereby effectively avoiding thermal damage to the vibrating plate caused by high temperatures and ensuring the elasticity, sealing, and service life of the vibrating plate.

[0016] Improved product reliability and durability: Because the vibration plate is effectively protected, aging, cracking or performance degradation caused by overheating are avoided, and the overall reliability of the accumulator is significantly improved.

[0017] Simplified structure and manufacturing process, reduced costs: Compared with solutions that involve adding heat-insulating gaskets, applying heat-insulating coatings, or using complex multi-layer structures, the design of this utility model is extremely simple. The annular groove can be integrally formed during the machining of the upper and lower covers using conventional turning or milling processes, without the need for additional parts or complex assembly procedures. This "built-in" heat insulation design not only achieves excellent performance but also simplifies the production process, reduces manufacturing costs, and eliminates potential points of failure. 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 1 This is a schematic cross-sectional view of the structure of a three-section welded accumulator according to the present invention.

[0020] Figure 2 for Figure 1 A magnified view of the stop section.

[0021] In the diagram: 1-Upper cover, 2-Lower cover, 3-Vibration plate, 31-Fixed edge, 32-Reinforcing part, 4-Upper cover stop, 41-First upper plane, 42-Second upper plane, 43-Upper inclined surface, 5-Lower cover stop, 51-Positioning groove, 52-Lower plane, 53-Lower inclined surface, 6-Weld joint, 7-Annular groove, 9-Pressure chamber, 10-Hydraulic oil chamber, 11-Air filling / expelling hole, 12-Hydraulic oil hole. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1 and Figure 2 This utility model provides a technical solution: an energy accumulator suitable for electron beam welding, comprising an upper cover 1, a lower cover 2, and a vibrating plate 3 clamped between the two. The upper cover 1 and the lower cover 2 together constitute the sealed housing of the energy accumulator, which is usually made of a metal material with good weldability and high strength (such as alloy steel).

[0024] The vibrating plate 3 serves as the core elastic element, dividing the accumulator's interior into an upper pressure chamber 9 and a lower hydraulic oil chamber 10. The pressure chamber 9 is pre-charged with inert gas at a certain pressure, and is filled and released through the vent 11 at the top of the upper cover 1. The hydraulic oil chamber 10 is connected to an external hydraulic system through a hydraulic oil hole 12 at the bottom of the lower cover 2. In this embodiment, both the vent 11 and the hydraulic oil hole 12 are provided with internal threads for easy connection to external pipelines or installation of sealing plugs. In particular, the vent 11 can be reliably sealed after inflation using a threaded sealing pin or a sealing cap.

[0025] To cope with high-pressure working environments, the bottom center of the vibratory plate 3 can protrude upwards, and a reinforcing part 32 is provided on the top surface of the protrusion. This reinforcing part 32 can be achieved by embedding or attaching a protective sheet, for example, attaching a wear-resistant nylon sheet. This prevents the vibratory plate from directly contacting the inner wall of the lower cover 2 when it moves to its extreme position, thus providing cushioning and wear protection, and extending the service life of the vibratory plate.

[0026] The key feature of this invention lies in the connection and welding structure between the upper cover 1 and the lower cover 2. Please refer to the following carefully. Figure 2 The inner side of the bottom of the upper cover 1 is machined with an upper cover stop 4, and the outer side of the top of the lower cover 2 is machined with a lower cover stop 5. The upper cover stop 4 is composed of a first upper plane 41, a second upper plane 42, and an upper inclined surface 43 connecting them. The lower cover stop 5 is composed of a positioning groove 51, a lower plane 52, and a lower inclined surface 53 connecting them.

[0027] During assembly, the edge of the vibrating plate 3, i.e., the fixed edge 31, is precisely accommodated and clamped within the space formed by the first upper plane 41 and the upper inclined plane 43 of the upper cover 1 and the positioning groove 51 of the lower cover 2, thus achieving initial positioning and sealing of the vibrating plate. Subsequently, the upper cover 1 and the lower cover 2 are further pressed together, so that the upper inclined plane 43 and the lower inclined plane 53 fit together, while the second upper plane 42 and the lower plane 52 also fit tightly together, forming the weld joint 6 to be welded.

[0028] The core innovation of this utility model lies in the fact that one or more annular grooves 7 are machined on the upper inclined surface 43 and / or the lower inclined surface 53. In this preferred embodiment, annular grooves 7 are provided on both the upper inclined surface 43 and the lower inclined surface 53, and the two are staggered in spatial position, such as... Figure 2 As shown. This staggered arrangement design can maximize the extension of the heat conduction path, forming a "labyrinthine" heat flow channel, which further enhances the heat insulation effect.

[0029] The dimensions of the annular groove 7 can be optimized based on the shell thickness, material thermal conductivity, and welding process parameters. For example, in one specific embodiment, the depth of the annular groove 7 can be set to 1-3 mm, and the width can be set to 1-3 mm. Such dimensions are sufficient to form an effective thermal barrier while ensuring that the connection part still has sufficient structural strength to withstand the internal high pressure.

[0030] During electron beam welding, a high-energy-density electron beam precisely bombards the weld joint 6, causing it to melt and solidify rapidly, forming a high-quality weld. A large amount of heat generated during welding is conducted from the weld joint 6 to the surrounding area. When the heat attempts to conduct along the upper and lower inclined surfaces 43 to the fixed edge 31 of the internal vibrating plate 3, it encounters the obstruction of the annular groove 7. Due to the presence of the groove 7, the heat must take a longer route and be conducted through a solid metal portion with a significantly reduced cross-sectional area, resulting in a sharp decrease in heat flux. Simultaneously, the air or vacuum medium inside the groove has extremely poor thermal conductivity, thus confining most of the heat to the vicinity of the welding area, ensuring that the temperature of the vibrating plate 3 remains well below its performance degradation threshold.

[0031] In summary, this utility model cleverly sets annular grooves on the mating inclined surfaces of the upper and lower covers, forming a simple yet efficient built-in thermal barrier. This successfully solves the problem of heat conduction damaging the vibrating plate during electron beam welding, significantly improving the performance, reliability, and service life of the accumulator. At the same time, it simplifies the manufacturing process and reduces costs, thus possessing high practical value and market prospects.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model. Any minor modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. An energy storage device suitable for electron beam welding, 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 upper cover (1) has an upper cover stop (4) on the inner side of its bottom, and the lower cover (2) has a lower cover stop (5) on the outer side of its top. The upper cover stop (4) includes a first upper plane (41) horizontally arranged at the top, a second upper plane (42) arranged at the bottom, and an upper inclined surface (43) connecting the first upper plane (41) and the second upper plane (42). The lower cover stop (5) includes a positioning groove (51) arranged on the outer side of the upper part, a lower plane (52) arranged at the bottom, and a side connecting groove. The lower inclined surface (53) of the positioning groove (51) and the lower plane (52), the first upper plane (41), the upper inclined surface (43) and the positioning groove (51) together form a space for accommodating the fixed edge (31) of the vibration plate (3); after the upper cover (1) and the lower cover (2) are assembled, the upper inclined surface (43) and the lower inclined surface (53) cooperate, the second upper plane (42) and the lower plane (52) cooperate to form a weld (6), and an annular groove (7) is provided on the upper inclined surface (43) and / or the lower inclined surface (53).

2. The energy storage device suitable for electron beam welding according to claim 1, characterized in that: The inner cavity formed by the closing of the upper cover (1) and the lower cover (2) is divided into a pressure chamber (9) and a hydraulic oil chamber (10) by a vibrating plate (3). The top of the upper cover (1) is provided with an air filling and emptying hole (11) that communicates with the pressure chamber (9), and the bottom of the lower cover (2) is provided with a hydraulic oil hole (12) that communicates with the hydraulic oil chamber (10).

3. The energy storage device suitable for electron beam welding according to claim 2, characterized in that: The air inlet / outlet (11) and hydraulic oil inlet (12) are provided with internal and / or external threads.

4. An energy storage device suitable for electron beam welding according to claim 3, characterized in that: The inflation / deflation port (11) is sealed by a threaded sealing pin or sealing cap.

5. An energy storage device suitable for electron beam 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.

6. An energy storage device suitable for electron beam welding according to claim 5, characterized in that: The reinforcing part (32) is configured to have a protective sheet embedded or pasted in it.

7. An energy storage device suitable for electron beam welding according to claim 6, characterized in that: The protective sheet is a nylon sheet.

8. An energy storage device suitable for electron beam welding according to claim 1, characterized in that: The annular groove has a depth of 1-3 mm and a width of 1-3 mm.

9. An energy storage device suitable for electron beam welding according to claim 1, characterized in that: The annular grooves on the upper inclined surface (43) and the annular grooves on the lower inclined surface (53) are staggered.

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