Double-thread welding nut column suitable for product with air tightness requirement

Abstract

The utility model relates to the technical field of nut columns, and particularly discloses a double-thread welding nut column suitable for products with air tightness requirements. The nut column comprises a nut column body and a flange plate arranged at the bottom of the nut column body, a threaded hole is formed in the nut column body and is a blind hole, double welding rings comprising a first welding ring and a second welding ring are arranged on the top face of the flange plate in a protruding mode, the first welding ring is arranged in the second welding ring, and an annular groove is formed between the double welding rings in a spaced mode. By arranging the double welding rings, the end, with the double welding rings, of the flange plate on the nut column body makes contact with the surface of a plate, energization arc striking is conducted, after the contact face is melted, certain pressure is applied to the nut column to complete welding, the welding ring fusion welding area of the face-to-face welding face is larger, and the fastening force is higher after a product is welded; the threaded hole is arranged to be the blind hole, when the welding ring is welded to a workpiece, a sealed environment is formed through the design of the molten welding ring and the blind hole, and therefore the strict requirement of customers for air tightness is met.

Description

Technical Field

[0001] This utility model relates to the technical field of nut post, and specifically discloses a double-groove welded nut post suitable for products with airtightness requirements. Background Technology

[0002] Stud nuts are a type of fastener used for joining sheet metal (or pipe fittings). They are mainly divided into two categories: press-fit stud nuts and welded stud nuts. Press-fit stud nuts are pressed into the sheet metal using pressure, utilizing their teeth or grooves to embed into the sheet metal for fixation. Welded stud nuts, on the other hand, are fixed to the sheet metal by welding. Typically, welded stud nuts have welding points on the bottom of the welding flange to ensure a strong weld. Both types of stud nuts are widely used in the automotive, electronics, and furniture industries, providing a quick and easy solution for joining sheet metal.

[0003] Although press-fit stud nuts are widely used due to their ease of installation, their structure and fixing methods have some limitations. Firstly, press-fit stud nuts primarily rely on their teeth or grooves to embed into the workpiece for fixation, a design that often fails to meet the stringent requirements of whole-package airtightness testing. Furthermore, when press-fitting a large number of studs onto large workpieces, such as pressing 60-70 studs onto a 1500*1200mm sheet metal, traditional press-fitting processes are not only time-consuming and labor-intensive but also difficult to operate, easily leading to stud misalignment or inaccurate positioning. Simultaneously, when the sheet metal thickness is thin, such as T=0.7mm, press-fit studs may not provide sufficient tightening force, failing to meet the client's requirements for fastener strength.

[0004] Welded nut studs achieve fixation by connecting to the plate through welded bosses. While this provides a certain degree of robust connection, its welding structure also has shortcomings. For example, patent CN220816225U discloses a hexagonal flange faceplate-shaped welded nut, in which four welded bosses are evenly distributed around the center of the flange on the bottom of the flange. This evenly spaced arrangement helps to ensure uniform weld points and facilitates the outward extrusion of solder. However, the main effect of this welding structure is to connect surfaces at points, which is also difficult to meet the requirements of products with strict airtightness performance.

[0005] Therefore, a new nut post structure is needed to suit products with strict requirements for airtightness. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a double-groove welded nut post suitable for products with airtightness requirements.

[0007] This utility model discloses a double-groove welded nut post suitable for products with airtightness requirements, adopting the following technical solution:

[0008] A double-threaded welded nut post suitable for products with airtightness requirements includes: a nut post body and a flange disposed at the bottom of the nut post body. The nut post body has a threaded hole, which is a blind hole. The top surface of the flange has a double welded ring protruding from it, which includes a first welded ring and a second welded ring. The first welded ring is disposed inside the second welded ring, and the double welded rings are spaced apart to form an annular groove.

[0009] Preferably, the first weld ring is spaced apart from the top edge of the threaded hole.

[0010] Preferably, the distance L1 from the first weld ring to the top edge of the threaded hole and the distance L2 from the second weld ring to the top edge of the threaded hole are L1:L2 = 1:2.

[0011] Preferably, the tops of the first and second solder rings are configured as pointed shapes.

[0012] Preferably, the height of the first weld ring protruding from the top surface of the flange is greater than the height of the second weld ring protruding from the top surface of the flange.

[0013] Preferably, the first weld ring protrudes to a height of 0.4±0.05mm on the top surface of the flange, and the second weld ring protrudes to a height of 0.3±0.05mm on the top surface of the flange.

[0014] Preferably, the second welding ring is spaced from the edge of the top surface of the flange, and the space is 0.5±0.05mm.

[0015] Preferably, the width of the annular groove is 1 ± 0.05 mm.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] This invention utilizes a double-ring welding system. One end of the flange with the double welding rings on the nut column body contacts the surface of a plate (or pipe). An arc is ignited by applying current, and after the contact surface melts, a certain pressure is applied to the nut column to complete the welding. Compared to existing nut column structures that connect surfaces at points, this solution achieves a surface-to-surface connection, resulting in a larger welding area and stronger fastening force after welding. Furthermore, by designing the threaded hole as a blind hole and utilizing the annular groove formed between the double welding rings, the molten welding rings and the closed blind hole design create a sealed environment when welded to the workpiece, thus meeting the customer's stringent requirements for airtightness. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the nut column of this utility model;

[0019] Figure 2This is a cross-sectional view of the nut column of this utility model.

[0020] Explanation of icon numbers:

[0021] 1. Nut post body; 11. Threaded hole; 2. Flange; 21. First weld ring; 22. Second weld ring. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This embodiment discloses a double-groove welded nut post suitable for products with airtightness requirements, referring to... Figure 1-2 It includes a nut column body 1 and a flange 2 disposed at the bottom of the nut column body 1. The flange 2 extends radially along the edge of the bottom of the nut column body 1. The nut column body 1 is provided with a threaded hole 11. The threaded hole 11 is a blind hole that is open at one end and closed at the other end towards the flange 2. The top surface of the flange 2 is provided with a double weld ring including a first weld ring 21 and a second weld ring 22. The first weld ring 21 is disposed inside the second weld ring 22. The axis of the double weld ring is the same as the axis of the threaded hole 11. An annular groove is formed between the double weld rings. In this embodiment, the width of the annular groove is 1±0.05mm.

[0024] By setting two weld rings and using resistance welding to weld the nut column, the nut column resistance welding process involves contacting the end of the nut column body 1 with the flange 2 to the surface of the plate (or pipe), igniting an arc, and applying a certain pressure to the nut column after the contact surface melts to complete the welding. Compared with the existing nut column structure that connects surfaces by points, this solution achieves the effect of connecting surfaces by surfaces, with a larger weld ring fusion area and stronger fastening force after welding. The closed annular groove creates a seal at the welding position. In addition, compared with the ordinary welded nuts which are mostly through-hole designs, the threaded hole 11 is set as a blind hole. When welded to the workpiece, the molten weld ring and the non-through blind hole design form a sealed environment, thereby meeting the customer's strict requirements for airtightness.

[0025] To ensure smoother installation of the welded threaded hole 11, a distance is maintained between the first weld ring 21 and the top edge of the threaded hole 11. In this embodiment, the distance L1 between the first weld ring 21 and the top edge of the threaded hole 11, and the distance L2 between the second weld ring 22 and the top edge of the threaded hole 11, are L1:L2 = 1:2, making the equidistant arrangement of the two weld rings more reasonable. Furthermore, the height of the first weld ring 21 protruding from the top surface of the flange 2 is greater than the height of the second weld ring 22 protruding from the top surface of the flange 2. This means the inner ring of the two weld rings abuts against the welding area before the outer ring, which helps to better prevent a small amount of molten material from splashing into the threaded hole 11 during welding, thus affecting the subsequent smoothness of the threaded hole 11 installation. In this embodiment, the height of the first weld ring 21 protruding from the top surface of the flange 2 can be 0.4±0.05mm, and the height of the second weld ring 22 protruding from the top surface of the flange 2 can be 0.3±0.05mm.

[0026] As a preferred embodiment, the second weld ring 22 is located near the edge of the top surface of the flange 2, and a gap of 0.5±0.05mm is left between the second weld ring 22 and the edge of the top surface of the flange 2. This ensures that the weld ring formed by the surface connection has a larger fusion welding area, and also reserves space for the welding material for fusion welding, making the outer side of the flange 2 smoother.

[0027] As a preferred embodiment, the tops of the first welding ring 21 and the second welding ring 22, that is, the ends away from the nut column body 1, are set to a pointed shape. This design allows the pointed shape to reduce the contact area between the two welding surfaces during the welding process of the nut column on the plate surface. This allows for more concentrated heat transfer during welding, which helps to improve welding efficiency and welding strength.

[0028] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A double-threaded welded nut post suitable for products with airtightness requirements, comprising: The nut column body and the flange disposed at the bottom of the nut column body are characterized in that the nut column body is provided with a threaded hole, wherein the threaded hole is a blind hole, and the top surface of the flange is provided with a double weld ring including a first weld ring and a second weld ring, wherein the first weld ring is disposed inside the second weld ring, and the double weld rings are spaced apart to form an annular groove.

2. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The axis of the double welding ring is the same as the axis of the threaded hole.

3. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The first weld ring is spaced apart from the top edge of the threaded hole.

4. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 3, characterized in that, The distance L1 from the first weld ring to the top edge of the threaded hole, and the distance L2 from the second weld ring to the top edge of the threaded hole, are given by the ratio L1:L2 = 1:

2.

5. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The tops of the first and second solder rings are set in a pointed shape.

6. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The height at which the first weld ring protrudes from the top surface of the flange is greater than the height at which the second weld ring protrudes from the top surface of the flange.

7. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 6, characterized in that, The first weld ring protrudes 0.4±0.05mm above the top surface of the flange, and the second weld ring protrudes 0.3±0.05mm above the top surface of the flange.

8. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The second weld ring is spaced from the edge of the top surface of the flange by 0.5 ± 0.05 mm.

9. The double-threaded welded nut post suitable for products with airtightness requirements according to claim 1, characterized in that, The width of the annular groove is 1 ± 0.05 mm.

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