Gland connecting structure
By combining threaded connections and laser welding, the problem of stress changes in the welding area caused by arc welding is solved, resulting in a more robust and durable connection between the spindle and the top cover, avoiding material fatigue and corrosion.
Patent Information
- Application Number
- CN202423134732.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In the prior art, the main shaft and top cover of the gas recovery equipment are connected by arc welding, which leads to stress changes and material fatigue in the welding area, resulting in a decrease in connection strength and ultimately causing the main shaft to break.
The spindle is connected to the hollow shaft and top cover by threaded connection and laser welding. Laser welding is performed at key connection points to enhance connection strength and stability and avoid the impact of high temperature on the microstructure of the material.
It improves the strength and stability of the connection, prevents material fatigue damage caused by high temperature, and enhances the durability and corrosion resistance of the connection.
Smart Images
Figure CN223550266U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas recovery equipment technology, and in particular to a pressure cap connection structure. Background Technology
[0002] In the field of gas recovery equipment, the top cover 1 of the gas recovery equipment is connected to the connecting rod 5 via the main shaft 4, such as... Figure 1 and Figure 2 As shown, a spring 6 is installed on the main shaft 4. The connecting rod periodically presses down. Because it moves once every ten minutes, the frequent movement of the spring 6 causes repeated stress at the weld between the hollow shaft 3 and the main shaft 4. Figure 3 and Figure 4 As shown, this ultimately leads to fatigue damage and the fracture of the main shaft 4. Currently, the hollow shaft 3, the top cover, and the main shaft 4 are generally connected and fixed by arc welding. Due to the excessively high temperature during the arc welding process, stress changes occur in the welding area and the microstructure of the heat-affected zone changes, which in turn promotes material fatigue accumulation and ultimately leads to fracture. Utility Model Content
[0003] The purpose of this invention is to provide a pressure cap connection structure to solve the problem in the prior art where the stress change in the welding area caused by arc welding between the main shaft and the top cover affects the connection strength. The pressure cap connection structure of this invention will not affect the microstructure of the material in the connection area due to high temperature, thus making its load-bearing effect better and the connection more solid.
[0004] This utility model provides a pressure cap connection structure, including a top cover, a hollow shaft, and a main shaft. The top cover is provided with a first connecting hole, and the hollow shaft is provided with a second connecting hole. The hollow shaft is disposed on the upper side of the top cover, and the second connecting hole is coaxially disposed with the first connecting hole. An external thread is provided at the bottom end of the main shaft, and an internal thread adapted to the external thread is provided in the first connecting hole and the second connecting hole. The bottom end of the main shaft passes through the first connecting hole and the second connecting hole and is connected to the hollow shaft and the top cover by threaded engagement.
[0005] As a preferred embodiment of this utility model, the top end of the second connecting hole of the hollow shaft is connected to the main shaft to form a first welding point by laser welding, and the first welding point is arranged around the main shaft.
[0006] As a preferred embodiment of this utility model, a second weld joint is formed at the junction of the bottom end of the hollow shaft and the top cover by laser welding.
[0007] As a preferred embodiment of this utility model, the second weld is arranged around the hollow shaft.
[0008] As a preferred embodiment of this utility model, the bottom end of the first connecting hole of the top cover and the connection point of the main shaft are connected by laser welding to form a third welding point, and the third welding point is arranged around the main shaft.
[0009] As a preferred embodiment of this utility model, a plurality of reinforcing ribs are provided on the top side of the top cover, and the plurality of reinforcing ribs are arranged in a ring with the axis of the main shaft as the center.
[0010] As a preferred embodiment of this utility model, the reinforcing rib has an arc-shaped plate structure.
[0011] As a preferred embodiment of this utility model, the top cover is circular, and the reinforcing ribs are arranged along the edge of the top cover.
[0012] Compared with the prior art, the present invention has the following positive effects:
[0013] The pressure cap connection structure provided by this utility model includes a top cover, a hollow shaft, and a main shaft. The top cover has a first connecting hole, and the hollow shaft has a second connecting hole. The hollow shaft is positioned on the upper side of the top cover, and the second connecting hole is coaxial with the first connecting hole. An external thread is provided at the bottom end of the main shaft, and internal threads adapted to the external thread are provided in the first and second connecting holes. The bottom end of the main shaft passes through the first and second connecting holes and is connected to the hollow shaft and the top cover via a threaded engagement. In this pressure cap connection structure, the main shaft, hollow shaft, and top cover are connected by threads, so that the force between the main shaft and the hollow shaft mainly relies on the threaded connection. Compared with the existing arc welding method, this threaded fixing method does not affect the microstructure of the material in the connection area due to high temperature, resulting in better load-bearing capacity and a more secure connection. Attached Figure Description
[0014] 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.
[0015] Figure 1 This is a schematic diagram of the structure of the connecting rod in the uncompressed state in the prior art;
[0016] Figure 2 This is a schematic diagram of the structure of the connecting rod in the compressed state in the prior art;
[0017] Figure 3 This is a schematic diagram of the structure connecting the main shaft to the top cover and the hollow shaft in the prior art;
[0018] Figure 4 This is a schematic diagram of the structure when the spindle breaks in the prior art.
[0019] Figure 5 This is a schematic diagram of the pressure cap connection structure in this utility model;
[0020] Figure 6 This is a top view of the pressure cap connection structure in this utility model;
[0021] Figure 7 This is a schematic diagram of the internal connection structure of the pressure cap connection structure in this utility model;
[0022] Figure 8 This is a schematic diagram of the main shaft in this utility model;
[0023] Figure 9 This is a schematic diagram of the top cover in this utility model;
[0024] Figure 10 This is a schematic diagram of the top cover in this utility model.
[0025] In the diagram: 1. Top cover; 11. First connecting hole; 2. Reinforcing rib; 3. Hollow shaft; 31. Second connecting hole; 4. Main shaft; 41. External thread; 5. Connecting rod; 6. Spring; 71. First weld joint; 72. Second weld joint; 73. Third weld joint. Detailed Implementation
[0026] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and for simplification, 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0029] Example 1:
[0030] This embodiment provides a gland connection structure, such as Figures 5-10 As shown, the assembly includes a top cover 1, a hollow shaft 3, and a main shaft 4. The top cover 1, hollow shaft 3, and main shaft 4 can be made of weldable metal. The top cover 1 has a first connecting hole 11, and the hollow shaft 3 has a second connecting hole 31. Both the first connecting hole 11 and the second connecting hole 31 are circular holes. The hollow shaft 3 is positioned on the upper side of the top cover 1, and the second connecting hole 31 is coaxial with the first connecting hole 11. The hollow shaft 3 rests against the upper side of the top cover 1. The hollow shaft 3 is positioned on the top cover 1 to limit the movement of the main shaft 4, providing better stability to the main shaft 4.
[0031] An external thread 41 is provided at the bottom end of the spindle 4, and an internal thread adapted to the external thread 41 is provided in the first connecting hole 11 and the second connecting hole 31. The bottom end of the spindle 4 passes through the first connecting hole 11 and the second connecting hole 31 and is connected to the hollow shaft 3 and the top cover 1 by thread engagement.
[0032] In this embodiment, the main shaft 4, hollow shaft 3, and top cover 1 are connected by threads in the pressure cap connection structure. This means that the force between the main shaft 4 and hollow shaft 3 primarily relies on the threaded connection. Compared to existing arc welding methods, this threaded fixing method does not affect the microstructure of the material in the connection area due to high temperatures, resulting in better load-bearing capacity and a more robust connection. Furthermore, the main shaft 4 can pass through the first connecting hole 11 and directly connect to the top cover 1. In contrast, existing arc welding methods only weld the hollow shaft 3 to the main shaft 4 and top cover 1 at the top and bottom ends respectively. Therefore, the connection between the main shaft 4 and top cover 1 in this embodiment is more robust.
[0033] As a preferred embodiment, such as Figure 7 As shown, the top end of the second connecting hole 31 of the hollow shaft 3 is connected to the main shaft 4 by laser welding to form a first weld 71. The first weld 71 is arranged around the main shaft 4. The first weld 71 can be a welding ring continuously arranged along the circumference of the main shaft 4 to increase the welding area and make the connection more firm and even.
[0034] To further enhance the connection strength between the spindle 4 and the hollow shaft 3, and to prevent corrosive liquids from entering the thread gap and causing adverse effects, laser welding is used to reinforce the connection between the hollow shaft 3 and the spindle 4. Laser welding offers advantages such as precise heat input control, high-strength connection, and a smaller heat-affected zone, which helps improve the overall structural stability and durability, while effectively preventing corrosion.
[0035] As a preferred embodiment, such as Figure 7 As shown, a second weld 72 is formed at the junction of the bottom end of the hollow shaft 3 and the top cover 1 by laser welding. Laser welding further strengthens the connection between the hollow shaft 3 and the top cover 1. The second weld 72 can be a weld point evenly distributed along the circumference of the hollow shaft 3, or it can be a weld ring continuously arranged along the circumference of the hollow shaft 3.
[0036] In a preferred embodiment, the second weld 72 is arranged around the hollow shaft 3, which makes the connection between the hollow shaft 3 and the top cover 1 more balanced and firm, and avoids the presence of gaps between the hollow shaft 3 and the top cover 1 that could lead to the entry of corrosive liquids.
[0037] As a preferred embodiment, such as Figure 7 As shown, the bottom end of the first connecting hole 11 of the top cover 1 is connected to the main shaft 4 to form a third weld 73 by laser welding. The third weld 73 is arranged around the main shaft 4, and can be a weld ring continuously arranged along the circumference of the main shaft 4. The third weld 73 can further increase the connection strength between the top cover 1 and the main shaft 4, making the connection between the main shaft 4 and the top cover 1 more secure.
[0038] In this embodiment, a first welding point 71, a second welding point 72, and a third welding point 73 are provided by laser welding, which can further enhance the connection strength between the main shaft 4, the top cover 1, and the hollow shaft 3.
[0039] As a preferred embodiment, such as Figure 5 and Figure 6 As shown, multiple reinforcing ribs 2 are provided on the top side of the top cover 1, and the multiple reinforcing ribs 2 are arranged in a ring with the axis of the main shaft 4 as the center. The reinforcing ribs 2 are used to reinforce the top cover 1, prevent deformation, and give the top cover 1 better load-bearing strength.
[0040] In one preferred embodiment, the reinforcing rib 2 has an arc-shaped plate structure. Three reinforcing ribs 2 are provided, and the top cover 1 is circular, with the reinforcing ribs 2 arranged along the edge of the top cover 1. The reinforcing ribs 2 can be connected to the top cover 1 by welding or bolting. Alternatively, the reinforcing ribs 2 and the top cover 1 can be an integral structure.
[0041] As a preferred embodiment, such as Figure 6 As shown, the top cover 1 is circular, and the reinforcing ribs 2 are set along the edge of the top cover 1, which can effectively enhance the strength of the edge of the top cover 1 and prevent deformation.
[0042] The pressure cap connection structure in this embodiment connects the main shaft 4 with the top cover 1 and the hollow shaft 3 via threads. Compared with the existing arc welding method, this can effectively prevent the weld between the hollow shaft 3 and the main shaft 4 from being subjected to repeated stress, which could eventually cause fatigue damage and lead to fracture.
[0043] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any modifications and improvements made by those skilled in the art without departing from the inventive concept of the present utility model should be covered within the protection scope of the present utility model.
Claims
1. A gland connection structure, characterized in that, The device includes a top cover (1), a hollow shaft (3), and a main shaft (4). The top cover (1) is provided with a first connecting hole (11), and the hollow shaft (3) is provided with a second connecting hole (31). The hollow shaft (3) is located on the upper side of the top cover (1), and the second connecting hole (31) is coaxially arranged with the first connecting hole (11). An external thread (41) is provided at the bottom end of the main shaft (4). An internal thread adapted to the external thread (41) is provided in the first connecting hole (11) and the second connecting hole (31). The bottom end of the main shaft (4) passes through the first connecting hole (11) and the second connecting hole (31) and is connected to the hollow shaft (3) and the top cover (1) by threaded engagement.
2. The gland connection structure according to claim 1, characterized in that, The top end of the second connecting hole (31) of the hollow shaft (3) is connected to the main shaft (4) by laser welding to form a first weld (71), and the first weld (71) is arranged around the main shaft (4).
3. The gland connection structure according to claim 1, characterized in that, A second weld (72) is formed at the junction of the bottom end of the hollow shaft (3) and the top cover (1) by laser welding.
4. The gland connection structure according to claim 3, characterized in that, The second weld (72) is arranged around the hollow shaft (3).
5. The gland connection structure according to claim 1, characterized in that, The bottom end of the first connecting hole (11) of the top cover (1) is connected to the main shaft (4) by laser welding to form a third welding point (73), and the third welding point (73) is arranged around the main shaft (4).
6. The gland connection structure according to claim 1, characterized in that, Multiple reinforcing ribs (2) are provided on the top side of the top cover (1), and the multiple reinforcing ribs (2) are arranged in a ring with the axis of the main shaft (4) as the center.
7. The gland connection structure according to claim 6, characterized in that, The reinforcing rib (2) has an arc-shaped plate structure.
8. The gland connection structure according to claim 7, characterized in that, The top cover (1) is circular, and the reinforcing ribs (2) are arranged along the edge of the top cover (1).