Expandable nut assembly

Abstract

The utility model provides an expandable nut assembly which abandons the complicated process of machining threads or welding nuts on the inner wall of a traditional pipe body in terms of installation convenience. The inserting pipe is of a unique four-section structure and can be directly inserted into the pipe body, professional equipment and high-difficulty welding are not needed, common workers can operate the inserting pipe, the early-stage preparation time is greatly shortened, the requirement for the skills of the workers is lowered, and the installation process is rapid and efficient. The restraint rings at the front left end of the insertion pipe body gather the insertion pipe, so that insertion is facilitated; during expansion, the right end restraint ring prevents excessive expansion, and it is guaranteed that pre-tightening force is uniform and reasonable. The anti-disengaging part prevents the nut from disengaging, and stable connection is ensured; the ring-shaped nut is matched with the accommodating area, so that the movement is smooth and stable; the deformation groove disperses stress for expansion of the insertion pipe so that the insertion pipe can be accurately and stably attached to the pipe wall, and the overall performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of hardware fastener technology, specifically to an expandable nut assembly. Background Technology

[0002] In many industrial and engineering applications today, it is extremely common to connect pipes to other components and fix them axially at the ends using bolts. Traditional fixing methods can be broadly divided into two categories: one is to directly machine internal threads that match the bolts onto the inner wall of the pipe. This process requires high-precision machining equipment and skilled technicians because the inner wall space of the pipe is narrow, making machining difficult. Not only must the thread pitch and tooth profile be accurate, but the thread depth must also be uniform. Even slight deviations can lead to difficulties in screwing in the bolts or an unstable connection. Moreover, if the pipe material has high hardness or a complex structure, machining the internal threads is even more time-consuming and labor-intensive, greatly increasing production and time costs.

[0003] Secondly, a method of welding nuts onto the pipe body is used. The welding process itself presents numerous challenges, requiring strict control of welding parameters such as current, voltage, and welding speed to ensure the weld strength between the nut and the pipe body. Otherwise, during subsequent use, poor welding quality can lead to problems such as the nut loosening or falling off, posing a safety hazard to the entire connection structure. Furthermore, the welded pipe body requires post-processing steps such as cleaning and grinding to remove weld slag and spatter, ensuring surface smoothness and preventing wear or interference with other components. This undoubtedly further complicates the operation.

[0004] In summary, both traditional methods of machining internal threads and welding nuts have significant drawbacks such as complex operation procedures and poor convenience, making it difficult to meet the needs of modern industry for efficient, convenient, and reliable production. There is an urgent need for a new, easy-to-operate solution for fixing the ends of pipes. Summary of the Invention

[0005] In view of the problems pointed out in the background art, this utility model proposes an expandable nut assembly to solve the above-mentioned technical problems.

[0006] The technical solution of this utility model is implemented as follows:

[0007] An expandable nut assembly,

[0008] Includes a tubular insertion tube, wherein the insertion tube is composed of four identical lobes;

[0009] The outer side wall of the left end of the insertion tube along the axial direction is provided with a protruding limiting abutment part, the outer diameter of which is larger than the outer diameter of the insertion tube.

[0010] An annular constraint groove is arranged on the outer side wall of the plug-in pipe, and a constraint ring is connected in the constraint groove.

[0011] A nut is arranged in the plug-in pipe, the inside of the plug-in pipe is divided into an expansion area and a containing area from left to right, and the nut is arranged in the containing area.

[0012] The constraint groove is further arranged on the plug-in pipe, and the constraint groove is arranged on the plug-in pipe.

[0013] The constraint ring can be elastically stretched.

[0014] The inside wall of the right end of the plug-in pipe is provided with a nut anti-extrusion anti-extrusion part.

[0015] The nut is a circular ring, and the inner diameter of the containing area is equal to the outer diameter of the nut.

[0016] The four-limb plug-in pipe is provided with a deformation groove, and the deformation groove penetrates the inside and outside of the plug-in pipe.

[0017] The constraint ring is made of metal material, and the constraint ring is provided with a disconnection groove.

[0018] The utility model further sets up still includes with nut thread connection's bolt.

[0019] The utility model discloses the beneficial effects are:

[0020] In the installation convenience aspect, the complex process of traditional processing thread or welding nut in the pipe body inner wall is abandoned. Its unique plug-in pipe structure, by virtue of four-limb design can be directly inserted into the pipe body, without professional precision thread processing equipment and high-difficulty welding operation, greatly shortens the preparation time, ordinary worker can easily start, reduces the strict requirement of professional skill to operating personnel, makes the installation process efficient and fast.

[0021] From the connection stability consideration, after the plug-in pipe is inserted into the pipe body, the accurate positioning is carried out through the limiting abutment part, the subsequent expansion effect is effectively avoided by inserting too deep or too shallow, the consistency of each installation is ensured. Rotating the bolt promotes the expansion of the plug-in pipe, and the pipe body inner wall is closely combined to form a pre-tightening force, compared with the traditional way of connection, it is more stable, can effectively resist external force such as vibration and impact, reduces the risk of loose connection, guarantees the long-term stable operation of equipment, especially suitable for systems such as mechanical transmission and pipeline transportation, which have high requirements on stability.

[0022] The advantages are prominent in cost control, on the one hand, the expensive equipment investment, labor cost and time cost required for processing threads or welding nuts are reduced; on the other hand, due to the reasonable component structure design, the material utilization of each part is efficient, the raw material waste is reduced, and in subsequent maintenance, due to the detachable replacement characteristics, the maintenance cost is also reduced, a large amount of funds is saved for enterprises, and high economic benefits are obtained.

[0023] Meanwhile, the setting of the constraint ring further optimizes the performance of the assembly, both assists the insertion of the insertion pipe and prevents excessive expansion, prolongs the service life of the assembly, and comprehensively improves the practicability and reliability of the product, and is expected to be widely applied to various pipe body connection scenes. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical schemes in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0025] Figure 1 The structure of the present application is shown in the figure.

[0026] Figure 2 The exploded view of the present application is shown in the figure. Figure One .

[0027] Figure 3 The sectional view of the present application is shown in the figure.

[0028] Figure 4 The exploded view of the present application is shown in the figure. Figure Two .

[0029] The reference signs in the drawings are as follows: insertion pipe 1, limiting abutting portion 2, constraint groove 3, constraint ring 4, nut 5, expansion area 61, containing area 62, anti-disengagement portion 7, deformation groove 8, disengagement groove 9, bolt 10. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] The following references Figures 1-4 The present application is described as follows:

[0032] Embodiment: An inflatable nut assembly, comprising a tubular spigot 1, the spigot 1 is composed of four identical petals; this unique four-petal structure is the basis for the inflation function of the entire assembly. Compared with the traditional one-piece tube body, the four-petal structure can flexibly expand outward under stress, creating conditions for subsequent close fitting with the inner wall of the tube body.

[0033] The outer side wall of the left end of the spigot 1 is provided with a protruding limiting abutment 2, the outer diameter of the limiting abutment 2 is larger than the outer diameter of the spigot 1; its role is crucial, when the spigot 1 is inserted into the tube body with the same outer diameter, the limiting abutment 2 can accurately abut with the end of the tube body. From the perspective of mechanics, this abutting process can effectively prevent the spigot 1 from being too deep into the tube body.

[0034] The outer side wall of the spigot 1 is provided with an annular constraint groove 3, and the constraint groove 3 is connected with a constraint ring 4; the constraint groove 3 is not designed arbitrarily, on the one hand, it provides a stable installation position for the constraint ring 4, on the other hand, through the constraint ring 4, a moderate radial constraint force is applied to the spigot 1, which maintains the relatively compact state of the four-petal structure of the spigot 1 when it is not inflated, facilitating insertion into the tube body; while in the inflation process, the constraint ring 4 can limit the spigot 1 from excessive inflation, avoiding damage to the structure of the spigot 1 or irreversible extrusion deformation of the tube body caused by excessive inflation. The material selection of the constraint ring 4 usually takes into account the elasticity and strength, such as high-strength rubber or special heat-treated metal elastic ring, the inner diameter, elastic modulus and other parameters of which need to be determined comprehensively according to the size, material and expected inflation force of the spigot 1 and other factors.

[0035] The spigot 1 is provided with a nut 5, the inside of the spigot 1 is divided into an inflation area 61 and a containing area 62 from left to right, the nut 5 is located in the containing area 62, and the inner diameter of the inflation area 61 gradually decreases from right to left. This gradually changing inner diameter design is a key geometric feature to realize the inflation function of the spigot 1.

[0036] It also includes a bolt 10 threadedly connected with the nut 5.

[0037] When the bolt 10 is connected with the nut 5 in the spigot pipe 1 after passing through another part, the bolt 10 will pull the nut 5 to move left with the rotation of the bolt 10. Since the nut 5 is located in the accommodation area 62 and is matched with the inner wall of the spigot pipe 1 with a certain gap to ensure smooth movement, when the nut 5 travels to the left to the expansion area 61, because the inner diameter of the expansion area 61 gradually shrinks, the nut 5 exerts an outward extrusion force on the inner side wall of the four-petal spigot pipe 1, forcing the spigot pipe 1 to gradually expand. In this process, the taper design, inner wall roughness of the expansion area 61 and the contact area with the nut 5 and other factors will directly affect the expansion efficiency, uniformity of the spigot pipe 1 and the size of the pre-tightening force formed with the pipe body. From the perspective of material mechanics, the stress and strain distribution of each part of the expansion area 61 when stressed needs to be accurately calculated to optimize the structural parameters and ensure that the spigot pipe 1 can still maintain good mechanical properties after multiple expansion-shrinkage cycles.

[0038] The inner diameter of the pipe body can be equal to the outer diameter of the spigot pipe 1 or slightly larger than the outer diameter of the spigot pipe 1.

[0039] The restraint groove 3 is provided with two, and the two restraint grooves 3 are respectively located at the left and right ends of the spigot pipe 1. From the perspective of mechanical principles and actual operation, this bilateral distribution design is of great significance. Before the spigot pipe 1 is inserted into the pipe body, the restraint groove 3 at the left end and the matching restraint ring 4 can effectively gather the left end of the spigot pipe 1, ensuring that the four-petal spigot pipe 1 remains relatively compact in the initial state, facilitating smooth insertion into the pipe body and avoiding scratching the inner wall of the pipe body or causing structural deformation of the spigot pipe 1 during insertion due to looseness. The restraint groove 3 and the restraint ring 4 at the right end play a key role in balancing and limiting during the expansion of the spigot pipe 1. When the spigot pipe 1 begins to expand due to the left movement of the nut 5, the right restraint ring 4 can prevent the right end of the four-petal spigot pipe 1 from expanding excessively outward, and together with the left restraint ring 4, it maintains the overall structural stability of the spigot pipe 1, ensuring uniform and controllable expansion and making the pre-tightening force distribution between the spigot pipe 1 and the inner wall of the pipe body more reasonable.

[0040] The restraint ring 4 is made of elastic material and can be elastically stretched. This material selection makes the restraint ring 4 show good adaptability when dealing with different working conditions of the spigot pipe 1. When the spigot pipe 1 is inserted into the pipe body, the restraint ring 4 can be elastically stretched to reduce the insertion resistance while still maintaining the radial restraint of the spigot pipe 1, ensuring the integrity of the four-petal structure; during the expansion of the spigot pipe 1, the elastic restraint ring 4 can also stretch accordingly as the outer diameter of the spigot pipe 1 increases, dynamically adjusting the restraint force, which neither hinders the expansion of the spigot pipe 1 nor effectively prevents its excessive expansion out of control, providing flexible protection for the stable operation of the entire assembly.

[0041] The constraint ring 4 implements structure two: the constraint ring 4 is made of metal material, and the constraint ring 4 is provided with a disconnection groove 9. The metal material gives the constraint ring 4 high strength and wear resistance, and is suitable for scenes with high requirements for the durability of the assembly and harsh working environments. The design of the disconnection groove 9 is ingenious. When the plug-in pipe 1 is not expanded, the disconnection groove 9 makes the constraint ring 4 have a certain opening gap, which is convenient for installation on the constraint groove 3. During the expansion process of the plug-in pipe 1, as the outer diameter of the plug-in pipe 1 increases, the constraint ring 4 can utilize the elastic deformation characteristics of the metal, and through the closing tendency of the disconnection groove 9, a stable radial holding force is generated on the plug-in pipe 1, which can also accurately control the expansion amplitude of the plug-in pipe 1, and ensure the reliability of the assembly.

[0042] The inner side wall of the right end of the plug-in pipe 1 is provided with an anti-extraction part 7 for preventing the nut 5 from being extracted. The anti-extraction part 7 is a key structure for ensuring the stable operation of the nut 5. Since the nut 5 needs to move left and right in the containing area 62 along with the rotation of the bolt 10, without the anti-extraction part 7, in some special working conditions, such as equipment vibration, frequent start and stop, etc., the nut 5 may be extracted out of the containing area 62, resulting in the failure of the entire connection. The anti-extraction part 7 is closely matched with the outer diameter of the nut 5 through reasonable size design and shape optimization, which can not only allow the nut 5 to move smoothly in the containing area 62, but also effectively block the nut 5 from being extracted to the right at the critical moment, thereby building a strong defense for the continuous and stable connection of the assembly.

[0043] The nut 5 is a circular ring, and the inner diameter of the containing area 62 is equal to or slightly larger than the outer diameter of the nut 5. The slightly larger design provides a certain degree of freedom for the nut 5, so that it can move left flexibly in the containing area 62 along with the pulling of the bolt 10, and will not generate excessive friction resistance due to interference fit, thereby affecting the rotation operation of the bolt 10. The equal design ensures smooth movement of the nut 5 while avoiding excessive shaking of the nut 5 in the containing area 62, thereby ensuring that the nut 5 always maintains good contact with the bolt 10 and the inner wall of the plug-in pipe 1, and providing a stable and reliable driving force for the expansion of the plug-in pipe 1.

[0044] The four-limb plug-in pipe 1 is respectively provided with a deformation groove 8, which penetrates through the inner and outer sides and the right side of the plug-in pipe 1. The deformation groove 8 provides a guiding and buffering space for the expansion of the plug-in pipe 1. When the nut 5 pushes the inner side wall of the plug-in pipe 1 to the left, the four-limb plug-in pipe 1 must expand outward, and the deformation groove 8 allows the material of the plug-in pipe 1 to "give way" during the expansion process, effectively disperses stress concentration, reduces the risk of rupture of the plug-in pipe 1 due to expansion, and also ensures that the plug-in pipe 1 can accurately and smoothly expand according to the expected design, tightly fit the inner wall of the pipe body, and improve the working performance of the entire assembly.

[0045] The above only describes the preferred embodiment of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. An expandable nut assembly, characterized in that: Includes a tubular insertion tube (1), which is composed of four identical lobes; The outer side wall of the left end of the insertion tube (1) is provided with a protruding limiting abutment part (2), and the outer diameter of the limiting abutment part (2) is larger than the outer diameter of the insertion tube (1); The outer wall of the insertion tube (1) is provided with an annular constraint groove (3), and a constraint ring (4) is connected inside the constraint groove (3). The insertion tube (1) is provided with a nut (5). The interior of the insertion tube (1) consists of an expansion area (61) and a receiving area (62) from left to right. The nut (5) is located in the receiving area (62). The inner diameter of the expansion area (61) gradually decreases from right to left.

2. The expandable nut assembly according to claim 1, characterized in that: The constraint groove (3) is provided in two parts, and the two constraint grooves (3) are located at the left and right ends of the insertion tube (1) respectively.

3. The expandable nut assembly according to claim 1, characterized in that: The constraint ring (4) can be elastically stretched.

4. The expandable nut assembly according to claim 1, characterized in that: The inner wall of the right end of the insertion tube (1) is provided with an anti-detachment part (7) to prevent the nut (5) from coming out.

5. An expandable nut assembly according to claim 1, characterized in that: The nut (5) is annular, and the inner diameter of the receiving area (62) is equal to the outer diameter of the nut (5).

6. The expandable nut assembly according to claim 1, characterized in that: The four-lobed insertion tube (1) is provided with deformation grooves (8), which penetrate the inner and outer sides and the right side of the insertion tube (1).

7. An expandable nut assembly according to claim 1, characterized in that: The constraint ring (4) is made of metal material and has a break groove (9) on it.

8. An expandable nut assembly according to claim 1, characterized in that: It also includes bolts (10) that are threaded to the nut (5).

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