Grounding screw

Abstract

The grounding screw comprises a screw rod and a screw cap, the screw rod comprises a threaded section and a thread-free section which are connected end to end, the thread-free section is connected to the lower end face of the screw cap, an installation retaining wall and a tooth-shaped structure ring which are concentric with the screw rod are fixed to the lower end face of the screw cap, and the installation retaining wall is annularly arranged around the thread-free section. The tooth-shaped structure ring is arranged around the installation retaining wall, an elastic sealing gasket is arranged in the containing cavity between the installation retaining wall and the tooth-free section, the sealing gasket comprises a gasket face part and a sleeve part formed by extending downwards, and the gasket face part is embedded in the installation retaining wall to be fixed and can prevent water vapor from penetrating through the tooth-shaped structure ring to directly intrude into the screw. And the sleeve part is arranged on the thread-free section in a sleeving manner, and the outer wall of the sleeve part is flush with the thread section in the vertical direction, so that after the screw is installed on equipment, the periphery of the sleeve part can be tightly attached to the screw hole, a gap between the screw hole and the screw rod is sealed, the problem that external water vapor penetrates through a tooth-shaped structure to invade into the equipment is solved, and stable operation of the equipment is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of screw technology, and in particular to a grounding screw. Background Technology

[0002] To ensure safety, electrical equipment with metal casings generally requires grounding. This allows current from the metal casing to flow to the earth through a grounding wire in case of leakage. Grounding is achieved by a grounding screw installed on the metal casing. However, the insulation layer at the screw mounting point can impede the conduction between the screw and the metal casing. To break through the insulation layer on the metal casing, existing technologies involve machining a toothed structure under the nut or using a toothed washer on the screw. When the screw is screwed into the mounting hole of the metal casing, the toothed structure can scratch and scrape off the insulation layer on the mounting surface of the metal casing, exposing the metal casing that was covered by the insulation layer. This allows the grounding wire to establish a good connection between the grounding screw and the metal casing.

[0003] However, after the grounding screw is installed on the metal casing, the toothed structure located below the end face of the nut forms a gap between the screw mounting surface and the end face of the nut. The groove of the toothed structure used to discharge insulation layer debris will act as a channel for the screw to communicate with the outside world, allowing external moisture to pass through the pores of the toothed structure itself and enter the equipment from the screw, affecting the stable operation of the electrical equipment. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a grounding screw to solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a grounding screw, which includes a screw rod and a nut. The screw rod includes a threaded section and a toothless section connected end to end. The toothless section of the screw rod is connected to the lower end face of the nut. The lower end face of the nut is fixed with a mounting retainer and a toothed structural ring concentric with the screw rod. The mounting retainer is arranged in a ring around the toothless section, and the toothed structural ring is arranged around the mounting retainer. The mounting retainer and the toothless section are spaced apart to form a ring-shaped receiving cavity.

[0007] The cavity contains a sealing gasket, which is an elastic gasket. The sealing gasket includes a padding portion and a sleeve portion extending downward from the padding portion. The padding portion is fixedly embedded in the mounting retaining wall. The sleeve portion is fitted onto the threadless section. The inner wall of the sleeve portion fits the threadless section. The outer wall of the sleeve portion is flush with the threaded section in the vertical direction.

[0008] Preferably, the outer periphery of the mounting retaining wall is connected to the inner periphery of the toothed structural ring.

[0009] Preferably, the toothed structure ring includes a plurality of arc-shaped pieces extending spirally in the circumferential direction. The plurality of arc-shaped pieces are evenly spaced apart from each other and are arranged to gradually rise in the radial direction from the center of the toothed structure ring outward.

[0010] Preferably, along the extension direction of the screw, the thickness of the pad surface is greater than the thickness of the mounting retaining wall.

[0011] Preferably, the bottom surface of the padding surface protrudes vertically from the bottom end of the toothed structure ring.

[0012] Preferably, the sealing gasket is a rubber gasket.

[0013] Preferably, the mounting retaining wall and the nut are integrally formed.

[0014] The main technical effects achieved by this utility model are as follows:

[0015] The aforementioned grounding screw incorporates a mounting baffle within a toothed ring, into which an elastic sealing gasket is embedded. The gasket's padding portion is sandwiched between the metal surface and the lower end face of the nut, preventing moisture from directly penetrating the central screw shaft after passing through the toothed ring. Furthermore, by designing the upper portion connecting the screw shaft and nut as a toothless section, the sleeve portion of the sealing gasket is fitted onto this toothless section. Since the sleeve portion extends downwards from the padding portion, after the grounding screw is installed on the metal casing of the equipment, the outer circumference of the sleeve portion can tightly adhere to the inner wall of the screw hole, sealing the gap between the screw hole and the screw shaft. This forces moisture to vertically deflect downwards from the horizontal plane of the padding portion to overcome the sleeve portion's obstruction if it wishes to penetrate the equipment through the screw hole. This compensates for the porosity issue caused by the toothed structure of the grounding screw, effectively preventing external moisture from entering the equipment through the toothed structure, ensuring stable operation of the electrical equipment, and improving operational safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the grounding screw provided in an embodiment of the present invention;

[0017] Figure 2 A schematic diagram showing the grounding screw with the sealing gasket removed;

[0018] Figure 3 This is a cross-sectional view of the grounding screw.

[0019] The reference numerals in the above figures are as follows:

[0020] Screw 1, threaded section 11, toothless section 12;

[0021] Nut 2, mounting retaining wall 21, receiving cavity 210, toothed structure ring 22, arc-shaped piece 221;

[0022] 3. Sealing gasket, 31. Gasket surface, 32. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0024] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related are omitted.

[0025] Reference Figure 1 and Figure 2 As shown, this embodiment of the utility model provides a grounding screw, which includes a screw 1 and a nut 2.

[0026] The screw 1 includes a threaded section 11 and a toothless section 12 connected end to end. The toothless section 12 of the screw 1 is connected to the lower end face of the nut 2. The lower end face of the nut 2 is fixed with a mounting wall 21 and a toothed structure ring 22 concentric with the screw 1. The mounting wall 21 is arranged in a ring around the toothless section 12, and the toothed structure ring 22 is arranged around the mounting wall 21. The mounting wall 21 and the toothless section 12 are spaced apart to form a ring-shaped receiving cavity 210.

[0027] Among them, combined Figure 2 and Figure 3 As shown, the receiving cavity 210 contains a sealing gasket 3, which is an elastic gasket. The sealing gasket 3 includes a padding part 31 and a sleeve part 32 extending downward from the padding part 31. The padding part 31 is fixedly embedded in the mounting retaining wall 21. The sleeve part 32 is sleeved on the toothless section 12. The inner wall of the sleeve part 32 fits the toothless section 12. The outer wall of the sleeve part 32 is flush with the threaded section 11 in the vertical direction.

[0028] When the grounding screw provided in this embodiment is installed on the metal casing or sheet metal surface of electrical equipment, the gasket 31 of the sealing gasket 3 is sandwiched between the metal surface and the lower end face of the nut. This prevents water vapor from passing through the toothed ring 22 and directly invading the screw 1 located at the center of the receiving cavity 210. Furthermore, by using the toothless section 12 and fitting the sleeve 32 onto the toothless section 12, the outer periphery of the sleeve 32 can be tightly attached to the inner wall of the screw hole below the metal surface. If water vapor wants to enter the equipment through the screw hole, it needs to turn vertically downwards from the radial direction to break through the obstruction of the sleeve 32, which is difficult. Therefore, the grounding screw can compensate for the problem of pore exposure caused by the toothed structure of the grounding screw, effectively blocking external water vapor from entering the equipment through the toothed structure, ensuring the stable operation of the electrical equipment, and improving operational safety.

[0029] The outer periphery of the mounting baffle 21 is connected to the inner periphery of the toothed structure ring 22. The inner wall of the toothed structure ring 22 is in close contact with the outer periphery of the mounting baffle 21. Therefore, in addition to being used to embed and fix the sealing gasket 3, the mounting baffle 21 also serves to make external moisture need to bypass the mounting baffle 21 before contacting the pad surface 31 of the sealing gasket 3, thus extending the intrusion route of external moisture.

[0030] Specifically, the toothed ring 22 includes a plurality of arc-shaped pieces 221 extending spirally in the circumferential direction. The arc-shaped pieces 221 are evenly spaced apart from each other and gradually rise in the radial direction outward from the center of the toothed ring 22. When the toothed ring 22 cuts through the insulating layer of the metal shell it contacts, the debris of the insulating layer will be easily discharged to the outside through the spirally extending grooves between the arc-shaped pieces 221. The shape of the arc-shaped pieces 221 serves a guiding function.

[0031] To ensure that the bottom of the pad surface 31 fits tightly against the surface of the metal casing after the grounding screw is installed on the metal casing, the thickness of the pad surface 31 is greater than the thickness of the mounting retainer 21 along the extension direction of the screw 1. The bottom surface of the pad surface 31 protrudes from the bottom end of the toothed structure ring 22 in the vertical direction. If the bottom end of the toothed structure ring 22 is to be able to contact the surface of the metal casing to cut the insulation layer, the pad surface 31 will inevitably be pressed tightly.

[0032] The sealing gasket 3 is a rubber gasket. Rubber is a material with strong elasticity and good durability. It is easy to process into a gasket part 31 and a sleeve part 32. The material cost and processing cost are low, which is suitable for the mass production of the above-mentioned grounding screw.

[0033] In this embodiment, the mounting retaining wall 21 and the nut 2 are integrally formed. Furthermore, the toothed structure ring 22 and the nut 2 are also integrally formed, which makes it easier to manufacture the nut 2 together during processing and improves work efficiency.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A ground screw, characterized in that Includes a screw (1) and a nut (2), The screw (1) includes a threaded section (11) and a toothless section (12) connected end to end. The toothless section (12) of the screw (1) is connected to the lower end face of the nut (2). The lower end face of the nut (2) is fixed with a mounting baffle (21) and a toothed structure ring (22) concentric with the screw (1). The mounting baffle (21) is arranged in a ring around the toothless section (12), and the toothed structure ring (22) is arranged around the mounting baffle (21). The mounting baffle (21) and the toothless section (12) are spaced apart to form a ring-shaped receiving cavity (210). The cavity (210) contains a sealing gasket (3), which is an elastic gasket. The sealing gasket (3) includes a padding part (31) and a sleeve part (32) extending downward from the padding part (31). The padding part (31) is fixedly embedded in the mounting retaining wall (21). The sleeve part (32) is fitted onto the toothless section (12). The inner wall of the sleeve part (32) fits against the toothless section (12). The outer wall of the sleeve part (32) is flush with the threaded section (11) in the vertical direction.

2. The grounding screw of claim 1, wherein, The outer periphery of the mounting retaining wall (21) is connected to the inner periphery of the toothed structure ring (22).

3. The grounding screw of claim 1, wherein, The toothed structure ring (22) includes a plurality of arc-shaped pieces (221) extending spirally in the circumferential direction. The plurality of arc-shaped pieces (221) are evenly spaced apart from each other and arranged in a radial direction from the center of the toothed structure ring (22) outward. The arc-shaped pieces (221) gradually rise and are arranged.

4. The grounding screw of claim 1, wherein, Along the extension direction of the screw (1), the thickness of the pad surface (31) is greater than the thickness of the mounting retaining wall (21).

5. The grounding screw of claim 4, wherein, The bottom surface of the pad surface (31) is exposed in the vertical direction at the bottom end of the toothed structure ring (22).

6. The grounding screw of claim 1, wherein, The sealing gasket (3) is a rubber gasket.

7. The grounding screw of claim 1, wherein, The installation retaining wall (21) and the nut (2) are integrally formed.

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