Nut combination capable of increasing tightness

Abstract

The utility model provides a nut combination for increasing tightness, which comprises a bolt body, the bolt body comprises a screw and a head, the peripheral side of the screw is a smooth plane, a connecting piece is matched on the screw, a compression spring is arranged between the head and a nut, a screwing space is arranged in the screw, and the screw is provided with a nut. And internal threads are arranged in the screwing space. The utility model has the advantages that the service life can be prolonged, the leakproofness can be improved, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a nut combination for increasing tightness. Background Art

[0002] Existing nuts are an important type of fastener accessory, and their main function is fastening. However, as the usage time increases, the vibration of the objects connected by the nuts will cause the nuts to loosen, so they are prone to wear and fall off, thus affecting the use safety and working efficiency of other objects and causing unnecessary losses. Especially for some traditional connection devices, which have high requirements for fastening and tight pressure. If they are welded to death by electric welding, when the gap expands in the future, they cannot be tightened again. If pin fasteners are used, they are also prone to looseness. Content of the Utility Model

[0003] The purpose of the utility model is to provide a nut combination for increasing tightness in view of the deficiencies of the prior art. By adding a compression spring structure between the head and the connecting piece and cooperating with a sealing ring, the function of increasing the service life of the nut is realized, and the problem of easy loosening of the nut is solved.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A nut combination for increasing tightness, including a bolt body, the bolt body includes a screw rod and a head, the outer peripheral side of the screw rod is a smooth plane, and a connecting piece is fitted thereon. A compression spring is arranged between the head and the nut, a screwing space is arranged inside the screw rod, and an internal thread is arranged in the screwing space.

[0005] Preferably, a sealing ring is arranged between the screw rod and the connecting piece.

[0006] Preferably, the sealing ring is embedded in the connecting piece, and two sealing rings are arranged in an up-and-down arrangement.

[0007] Preferably, a clamping groove is arranged at the lower part of the screw rod, and a snap ring is arranged in the clamping groove, and the clamping groove is located below the connecting piece.

[0008] Preferably, a retaining edge is connected to the lower side of the head, the retaining edge is sleeved on the screw rod, and the retaining edge is located above the compression spring.

[0009] Preferably, the retaining edge is in sliding connection with the connecting piece.

[0010] Preferably, the diameter of the retaining edge is larger than the outer diameter of the compression spring.

[0011] Preferably, the thickness of the retaining piece gradually increases from the center to the outside away from the center.

[0012] The beneficial effects of the utility model are as follows:

[0013] (1) When the head of the present utility model drives the screw rod to rotate, the connecting piece on the smooth plane on the outer peripheral side of the screw rod can rotate and slide relatively. There is a screwing space inside the screw rod, and an internal thread is arranged in the screwing space. When the internal thread inside the bolt body cooperates with the external thread bolt, the connecting piece is fixed. At this time, when the screwing head drives the screw rod to rotate, under the action of the cooperation between the thread and the external thread bolt, the bolt body can move downward relative to the connecting piece, and at the same time compress the compression spring, providing pressure between the internal thread and the external thread of the external thread bolt, and at the same time increasing the friction force, enhancing the fastening property when the bolt body is screwed, and having stronger connectivity.

[0014] (2) By adding a sealing ring, the present utility model can avoid leakage of gas and liquid, which is helpful for maintaining the performance and efficiency of the product that needs to be sealed; in a hydraulic system or pipeline, the sealing ring can also prevent fluid leakage and keep the system running normally.

[0015] (3) By setting the thickness of the retaining piece to be thinner at the center, when the compression spring is squeezed, a guiding force towards the center of the gasket can be provided for the compression spring, enabling the compression spring to be more stable and coaxial with the screw rod, making the force on the compression spring more uniform, increasing the service life of the compression spring, and ensuring that the compression spring is not easily detached.

[0016] In summary, the present utility model has the advantages of increasing service life and increasing tightness. Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic cross-sectional view of the present utility model. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0020] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0022] Embodiment 1

[0023] Figures 1 to 2 Schematically shows a nut combination for increasing tightness in one embodiment of the present utility model.

[0024] As Figure 1 shown, this embodiment provides a nut combination for increasing tightness, including a bolt body 1. The bolt body 1 includes a screw rod 11 and a head 12. The outer peripheral side of the screw rod 11 is a smooth plane, and a connecting member 2 is fitted thereon. A compression spring 3 is provided between the head 12 and the nut 1. When the head 12 drives the screw rod 11 to rotate, the connecting member 2 on the smooth plane on the outer peripheral side of the screw rod 11 can rotate and slide relatively. A screwing space 111 is provided inside the screw rod 11, and an internal thread 112 is provided in the screwing space 111. When the internal thread 112 inside the bolt body 1 is engaged with an external thread bolt, the connecting member 2 is fixed. At this time, when the head 12 is screwed, it drives the screw rod 11 to rotate. At this time, under the action of the engagement between the thread 112 and the external thread of the bolt, the bolt body 1 can move downward relative to the connecting member 2, and at the same time compress the compression spring 3, providing pressure between the internal thread 112 and the external thread of the external thread bolt, and at the same time increasing the friction force and enhancing the fastening property when the bolt body 1 is screwed, with stronger connectivity.

[0025] Combined with Figure 2 shown, a sealing ring 21 is provided between the screw rod 11 and the connecting member 2.

[0026] In this embodiment, the sealing ring 21 can prevent gas and liquid leakage, which helps to maintain the performance and efficiency of the product that needs to be sealed; in a hydraulic system or pipeline, the sealing ring can also prevent fluid leakage and keep the system running normally.

[0027] Combined with Figure 2 As shown, the sealing ring 21 is embedded in the connecting piece 2, and two sealing rings 21 are arranged vertically.

[0028] In this embodiment, two sealing rings 21 arranged vertically can further improve the sealing performance for double insurance. Of course, the sealing ring 21 can also be replaced with a product with the same function such as a gasket.

[0029] Combined with Figure 2 As shown, a clamping groove 13 is provided at the lower part of the screw rod 11, a snap ring 131 is arranged in the clamping groove 13, and the clamping groove 13 is located below the connecting piece 2.

[0030] In this embodiment, arranging the snap ring 131 inside the clamping groove 13 can play a role in limiting the connecting piece 2, preventing the sealing ring 21 from slipping out before use and increasing the carrying difficulty. It can also prevent the connecting piece 2 and the compression spring 3 from falling to the ground or inside the equipment when the bolt body 1 is unscrewed after vertical screwing and installation, which is difficult to pick up. This design can increase the disassembly efficiency and convenience.

[0031] Combined with Figure 2 As shown, a retaining edge 4 is connected to the lower side of the head 12, the retaining edge 4 is sleeved on the screw rod 11, and the retaining edge 4 is located above the compression spring 3.

[0032] In this embodiment, the diameter of the retaining edge 4 is larger than the diameter width of the head 12, which can further increase the extrusion area of the retaining edge 4 on the compression spring 3 and prevent the compression spring 3 from falling off.

[0033] Combined with Figure 2 As shown, the retaining edge 4 is slidably connected to the connecting piece 2.

[0034] In this embodiment, when the screw rod 11 moves downward, it can slide relative to the connecting piece 2 and compress the compression spring 3 at the same time. At this time, there is still elastic force inside the compression spring 3, which can drive the screw rod 11 to move in the direction away from the external thread screw rod, thereby increasing the pressure between the external thread screw rod and the internal thread 112, increasing the friction between the external thread screw rod and the internal thread 112, and further increasing the tightness and fastening between the screw rod 11 and the external thread screw rod.

[0035] Combined with Figure 2 As shown, the diameter of the retaining edge 4 is larger than the outer diameter of the compression spring 3.

[0036] In this embodiment, the diameter of the edge 4 is larger than the outer diameter of the compression spring 3, which can better compress the compression spring 3, increase the pressing effect, and prevent the elastic deformation and falling off of the compression spring 3 during long-term use.

[0037] Combined Figure 2 As shown, the thickness of the retaining plate 4 gradually increases from the center to the outside away from the center.

[0038] In this embodiment, the thickness of the retaining plate at the center is relatively thin. When squeezing the compression spring 3, it can provide a guiding force for the compression spring 3 towards the center of the gasket, enabling the compression spring 3 to be more stably coaxial with the screw 11, making the force on the compression spring 3 more uniform, increasing the service life of the compression spring 3, and ensuring that the compression spring 3 is not easily detached.

[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A nut combination for increasing tightness, characterized in that, It includes a bolt body, the bolt body includes a screw rod and a head, the outer peripheral side of the screw rod is a smooth plane, and a connecting piece is fitted thereon. A compression spring is arranged between the head and the nut. A screwing space is arranged inside the screw rod, and an internal thread is arranged in the screwing space.

2. The nut combination for increasing tightness according to claim 1, characterized in that, A sealing ring is arranged between the screw rod and the connecting piece.

3. The nut combination for increasing tightness according to claim 2, wherein, The sealing ring is embedded into the connecting piece, and two sealing rings are arranged in an up-and-down arrangement.

4. A nut combination for increasing tightness according to claim 2, characterized in that, A clamping groove is arranged at the lower part of the screw rod, and the clamping groove is used for arranging a circlip, and the clamping groove is located below the connecting piece.

5. A nut combination for increasing tightness according to claim 1, characterized in that, A retaining edge is connected to the lower side of the head, the retaining edge is sleeved on the screw rod, and the retaining edge is located above the compression spring.

6. The nut combination for increasing tightness according to claim 5, characterized in that, A sliding connection is provided between the retaining edge and the connecting piece.

7. A nut combination for increasing tightness according to claim 1, characterized in that, The diameter of the retaining edge is larger than the outer diameter of the compression spring.

8. A nut combination for increasing tightness according to claim 1, characterized in that The thickness of the retaining piece gradually increases from the center to the place far away from the center.

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