An accumulator suitable for laser welding

Abstract

This utility model discloses an accumulator suitable for laser welding, including an upper cover, a lower cover, and a vibrating plate disposed between the upper and lower covers. A first upper plane, a first vertical plane, and a positioning groove together form a space to accommodate the fixed edge of the vibrating plate. After the upper and lower covers are assembled, the upper inclined surface and the lower inclined surface, the second vertical surface and the lower vertical surface, and the second upper plane and the lower plane fit together, and the upper arc surface and the lower arc surface together form a U-shaped weld joint. Shallow grooves are provided on the upper inclined surface and / or the lower inclined surface, and heat-insulating sheets are laid in the shallow grooves. The inner cavity formed by the closed upper and lower covers is divided into a pressure chamber and a hydraulic oil chamber by the vibrating plate. The top of the upper cover is provided with a charging and decharging 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 bottom center of the vibrating plate protrudes upward, and a reinforcing part is provided on the top surface of the protrusion. This accumulator effectively blocks the conduction of laser welding heat to the vibrating plate through the heat-insulating sheet, avoiding heat damage to the vibrating plate, improving welding quality and accumulator reliability.

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 laser welding. Background Technology

[0002] Accumulators, as important energy storage and pulsation absorption devices in hydraulic systems, are widely used in engineering machinery, aerospace, shipbuilding, petrochemicals, and other fields. A typical diaphragm accumulator includes components such as a shell and a vibrating plate. During manufacturing, the welding of the shell is a critical process that directly affects the accumulator's sealing performance, pressure resistance, and service life.

[0003] Traditional accumulator casing welding primarily employs methods such as argon arc welding, resistance welding, or electron beam welding. However, with increasing demands for precision manufacturing, laser welding technology is gradually becoming the mainstream choice. Laser welding offers advantages such as high energy density and fast welding speed, enabling deep penetration welding and is suitable for casing materials such as stainless steel and alloy steel. As described in Chinese Patent CN101879655A, laser welding can effectively simplify accumulator manufacturing processes, reduce product size, and improve sealing reliability. However, existing laser welding processes still have several significant drawbacks when applied to accumulator casings. These drawbacks mainly stem from the impact of high-temperature heat input during the welding process on internal components.

[0004] First, the thermal damage to the vibratory plate caused by the high temperatures of welding is the most prominent problem in existing technologies. Although laser welding has a relatively low heat input, the local temperature in the welding zone can reach thousands of degrees Celsius. Heat rapidly diffuses into the inner cavity of the shell through conduction, convection, and radiation, causing thermal aging, softening, deformation, and even carbonization of the vibratory plate material, such as rubber or elastic polymers. This not only reduces the gas-liquid separation efficiency of the accumulator but may also lead to leakage risks, seriously affecting the safety and durability of the system. To avoid this problem, segmented welding or post-assembly of the vibratory plate is often used, but this increases production steps, raises costs, and may introduce additional sealing hazards.

[0005] Secondly, existing accumulator structural designs lack sufficient thermal protection, leading to low welding efficiency and increased defects. Traditional shells are mostly single-layer structures, lacking effective thermal insulation mechanisms. During laser welding of U-shaped welds, heat is easily conducted along the shell wall to the vibration plate fixing area, causing localized stress concentration and uneven welds. According to patent documents such as CN101879655B, although existing processes mitigate this by optimizing welding parameters, these measures often sacrifice welding speed and penetration depth, resulting in low production efficiency.

[0006] In summary, while existing laser welding technology for accumulators has advantages in precision and efficiency, its drawbacks, such as heat-affected zone damage to the vibrating plate, structural complexity, high production costs, and low efficiency, have become bottlenecks restricting its development. Utility Model Content

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an accumulator suitable for laser welding. By adding an internal thermal isolation barrier, effective thermal protection of the vibrating plate is achieved, thereby improving the welding quality, production efficiency and overall performance of the accumulator.

[0008] To achieve the above objectives, the technical solution of the present invention is as follows: An accumulator suitable for laser welding includes an upper cover, a lower cover, and a vibration 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 horizontal upper plane at the top and a first vertical surface, an upper inclined surface, and a second vertical surface on the side. The bottom of the upper cover stop is provided with a second upper plane and an upper arc surface. The lower cover stop includes a positioning groove on the outer side of the upper portion. The inner side features a rounded chamfer, and the sides feature a downward slope and a downward drooping surface. The bottom of the lower cover stop has a lower plane and a downward arc surface. The first upward drooping surface, the first upward drooping surface, and the positioning groove together form a space to accommodate the fixed edge of the vibration plate. After the upper cover and lower cover are assembled, the upward slope and downward slope fit together, the second upward drooping surface and the downward drooping surface fit together, the second upper plane and the lower plane fit together, and the upward arc surface and the downward arc surface together form a U-shaped weld. A shallow groove is provided on the upward slope and / or downward slope, and a heat insulation sheet is laid in the shallow groove.

[0009] 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.

[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.

[0015] Furthermore, the thermal insulation sheet is an aluminum foil composite ceramic fiber sheet.

[0016] Compared with the prior art, the present invention achieves the following significant beneficial effects through its innovative structural design: The significant heat insulation effect is attributed to the shallow groove and built-in thermal insulation sheet on the inner mating surface of the U-shaped weld joint. During laser welding, the high-temperature heat generated at the weld point is primarily conducted inward along the shell. The thermal insulation sheet (such as aluminum foil composite ceramic fiber sheet) has an extremely low thermal conductivity, forming an effective thermal barrier along the critical heat transfer path, significantly hindering heat conduction to the fixed area of ​​the vibrating plate. This fundamentally avoids the aging, deformation, or carbonization problems caused by overheating of the vibrating plate, ensuring its physical properties and sealing function, and significantly improving the reliability and service life of the accumulator. Furthermore, the design of the stop also increases the distance between the weld and the vibrating plate, further minimizing the impact of heat on the vibrating plate.

[0017] The thermal insulation structure is ingeniously designed, requiring only shallow grooves on the mating surfaces of the shell to accommodate sheets. This requires minimal alteration to the overall accumulator structure and does not add any additional complex components. The design is easily implemented using existing machining methods with minimal cost increase. Furthermore, this thermal insulation solution is widely applicable to the design of laser-welded accumulators of various specifications and materials (such as stainless steel and alloy steel), demonstrating excellent versatility and potential for widespread adoption. 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 an overall structural diagram of an energy storage device suitable for laser welding according to this utility model.

[0020] Figure 2 This is a cross-sectional view of the overall structure of an energy storage device suitable for laser welding according to this utility model.

[0021] Figure 3 This is a partially enlarged schematic diagram of the present invention, showing the detailed structure of the welding area.

[0022] Figure 4 This is a cross-sectional view of the top cover of this utility model.

[0023] Figure 5 This is a cross-sectional view of the lower cover of this utility model.

[0024] In the diagram: 1-Upper cover; 2-Lower cover; 3-Vibration plate; 31-Fixing edge; 32-Reinforcing part; 4-Upper cover stop; 41-First upper plane; 42-First vertical plane; 43-Upper slope; 44-Second vertical plane; 45-Second upper plane; 46-Upper arc surface; 5-Lower cover stop; 51-Positioning groove; 52-Circular chamfer; 53-Lower slope; 54-Lower vertical plane; 55-Lower plane; 56-Lower arc surface; 6-U-shaped weld; 7-Shallow groove; 8-Heat insulation sheet; 9-Pressure chamber; 10-Hydraulic oil chamber; 11-Air filling / venting hole; 12-Hydraulic oil hole. Detailed Implementation

[0025] 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.

[0026] Please see Figure 1-4 This utility model provides an energy accumulator suitable for laser welding, the core of which lies in achieving active thermal isolation during the welding process through structural design.

[0027] As shown in the cross-sectional view of the structure, this accumulator includes an upper cover 1 and a lower cover 2, which are laser-welded to form a sealed shell. A vibrating plate 3, typically made of rubber or elastic polymer material, is clamped between the upper cover 1 and the lower cover 2. Its function is to divide the internal space of the shell into an upper pressure chamber 9 and a lower hydraulic oil chamber 10. The pressure chamber 9 stores high-pressure gases such as nitrogen, which are vented or depressurized through a vent hole 11 located at the top of the upper cover 1. The hydraulic oil chamber 10 is connected to an external hydraulic system, with hydraulic oil entering and exiting through a hydraulic oil port 12 located at the bottom of the lower cover 2. For ease of connection and sealing, both the vent hole 11 and the hydraulic oil port 12 can be provided with internal or external threads. In actual use, after inflation, the vent hole 11 is reliably sealed using a threaded sealing pin or a sealing cap.

[0028] To protect the vibrating plate 3 from hydraulic shock or wear caused by frequent contact with the inner wall of the lower cover 2 during use, its bottom center protrudes upwards, and a reinforcing part 32 is provided on the top surface of this protrusion. In a preferred embodiment, the reinforcing part 32 is achieved by embedding or attaching a protective sheet, preferably a wear-resistant nylon sheet, to extend the service life of the vibrating plate.

[0029] Please refer to this carefully. Figure 2-4 It details the key innovative structure of this utility model, namely the welding area between the upper cover 1 and the lower cover 2.

[0030] The bottom inner side of the upper cover 1 is provided with a specially shaped upper cover stop 4, and the top outer side of the lower cover 2 is provided with a matching lower cover stop 5. Specifically, the upper cover stop 4 includes, from the inside out: a first upper plane 41 and a first upper vertical surface 42 for pressing the fixed edge 31 of the vibration plate 3; an upper inclined surface 43 extending outward and downward; a second upper vertical surface 44 for transition; a second upper plane 45 for final positioning; and the outermost upper arc surface 46 for forming a weld joint.

[0031] Correspondingly, the lower cover stop 5 includes, from the inside out: a positioning groove 51 for accommodating the fixed edge 31 of the vibration plate 3; a rounded chamfer 52 to prevent stress concentration; a lower inclined surface 53 that mates with the upper inclined surface 43; a lower inclined surface 54 that mates with the second upper vertical surface 44; a lower surface 55 that mates with the second upper plane 45; and the outermost lower arc surface 56 for forming a weld joint.

[0032] When the upper cover 1 and the lower cover 2 are assembled, the fixed edge 31 of the vibrating plate 3 is stably clamped within the space formed by the first upper plane 41, the first vertical surface 42, and the positioning groove 51, achieving initial positioning and sealing. Simultaneously, the mating surfaces 43 and 53, 44 and 54, and 45 and 55 of the two covers fit tightly together, ensuring assembly accuracy. The outermost upper arc surface 46 and lower arc surface 56 together form a standard U-shaped weld joint 6, providing an ideal weld shape for subsequent laser welding.

[0033] The core innovation of this invention lies in the fact that a shallow annular groove 7 is machined on the upper inclined surface 43 and / or lower inclined surface 53 near the inner side of the U-shaped weld joint 6. Before fastening the upper cover 1 and the lower cover 2, a pre-cut annular heat-insulating sheet 8 is laid in this shallow groove 7. This heat-insulating sheet 8 is preferably an aluminum foil composite ceramic fiber sheet. Ceramic fiber is an excellent high-temperature heat insulation material with extremely low thermal conductivity, while the outer aluminum foil can reflect some heat radiation; the combination of the two further enhances the heat insulation effect.

[0034] The working principle is as follows: During laser welding, a high-energy laser beam is focused within the U-shaped weld joint 6, melting and solidifying the metal to form a strong weld. The large amount of heat generated during welding is conducted from the weld point outwards, with one major heat transfer path being along the shell inwards to the fixed edge 31 of the vibrating plate 3. However, due to the presence of the heat-insulating sheet 8, this critical heat transfer path is effectively blocked. Most of the heat is confined to the vicinity of the welding area, preventing it from quickly reaching and damaging the temperature-sensitive vibrating plate 3. Thus, even under highly efficient laser welding parameters, the vibrating plate 3 remains within a safe temperature range, ensuring the final performance and long-term reliability of the accumulator. Furthermore, the design of the stop also increases the distance between the weld and the vibrating plate, further preventing heat from affecting the vibrating plate.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy accumulator suitable for laser 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 and a first upper vertical surface (42), an upper inclined surface (43), and a second upper vertical surface (44) arranged on the side. The bottom of the upper cover stop (4) has a second upper plane (45) and an upper arc surface (46). The lower cover stop (5) includes a positioning groove (51) arranged on the outer side of the upper part, a rounded chamfer (52) arranged on the inner side, and a lower inclined surface (53) and a lower vertical surface (54) arranged on the side. The bottom of the lower cover stop has a lower plane (55) arranged on the outer side. 5) and the lower arc surface (56), the first upper plane (41), the first upper vertical surface (42) 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 vertical surface (44) and the lower vertical surface (54) cooperate, the second upper plane (45) and the lower plane (55) cooperate, the upper arc surface (46) and the lower arc surface (56) cooperate together to form a U-shaped weld (6), a shallow groove (7) is provided on the upper inclined surface (43) and / or the lower inclined surface (53), and a heat insulation sheet (8) is laid in the shallow groove.

2. The energy storage device suitable for laser 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 laser 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. The energy storage device suitable for laser 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 laser 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 laser 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 laser welding according to claim 6, characterized in that: The protective sheet is a nylon sheet.

8. An energy storage device suitable for laser welding according to claim 1, characterized in that: The thermal insulation sheet (8) is an aluminum foil composite ceramic fiber sheet.

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