Screw for electrical equipment

Abstract

The utility model discloses a screw of electrical equipment. The screw comprises a nut, a screw rod section and an elastic washer. A tooth-shaped structure is arranged on the inner end face of the nut. The elastic washer is arranged on the screw rod section in a sleeving mode, the elastic washer abuts against the inner end face of the nut, a receding groove for receding the tooth-shaped structure is formed in the elastic washer, and the tooth-shaped structure is hidden in the receding groove. The peripheral edge of the elastic washer extends from the inner end face of the nut so as to be away from the inner end face of the nut in the outward expansion inclination direction, a deformation gap position is formed, the peripheral edge of the elastic washer is separated from the inner end face of the nut, and when the elastic washer is stressed and deformed, the tooth-shaped structure is exposed out of the receding groove. The tooth-shaped structure breaks the insulating layer along with rotation of the nut, so that the grounding wire can be communicated with a metal structure of electrical equipment through the screw, and after the screw is tightened, the elastic washer is tightly pressed on the mounting surface and covers the metal structure broken by the tooth-shaped structure, so that external air is isolated from invading, and oxidation corrosion after long-term use is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, in particular to screws for electrical equipment. Background Art

[0002] Since many electrical equipment use metal casings, protective paint is usually applied on the metal casing of the electrical equipment. The protective paint can prevent the metal casing from being corroded, and the protective paint can also serve as an insulating layer to prevent operators from directly contacting the live metal casing when accidents such as electrical leakage occur.

[0003] In accordance with safety standards, the metal casing also needs to be grounded so that when leakage occurs, the current on the metal casing can flow into the earth through the ground wire. This is achieved by installing a grounding screw on the metal casing. However, the insulating layer at the screw installation location will hinder the conduction between the screw and the metal casing. In order to break the insulating layer on the metal casing, the prior art solution is to form a toothed structure under the nut or to sleeve a toothed gasket on the screw. When the screw is screwed into the mounting hole of the metal casing, the toothed structure can be used to scratch and scrape off the insulating layer of the mounting surface of the metal casing in contact with it, exposing the metal casing shielded by the insulating layer, so that the grounding wire can be well connected to the metal casing through the grounding screw.

[0004] However, this type of solution in the prior art will cause the installation surface where the insulation layer is broken to lose its protective function and become susceptible to corrosion. Water vapor in the atmosphere can also penetrate through the gap between the nut and the installation surface, affecting the electrical equipment. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a screw for electrical equipment to solve the above problems.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a screw for electrical equipment, which comprises a nut, a screw rod section and an elastic washer.

[0008] A tooth structure is provided on the inner end surface of the nut; the screw section is connected to the inner end surface of the nut; the elastic washer is sleeved on the screw section, the elastic washer abuts against the inner end surface of the nut, and a clearance groove for the tooth structure of the nut is opened on the elastic washer, so that the tooth structure is hidden in the clearance groove.

[0009] Among them, the outer peripheral edge of the elastic washer extends from the inner end face of the nut, away from the inner end face of the nut in an outwardly expanding inclined direction, forming a deformation gap position, so that the outer peripheral edge of the elastic washer is separated from the inner end face of the nut, so that the toothed structure is exposed outside the clearance groove when the elastic washer is deformed under force.

[0010] Preferably, along the axial direction of the screw segment on the inner end surface of the nut, the thickness of the toothed structure is equal to the depth of the clearance groove.

[0011] Preferably, the toothed structure and the nut are integrally formed.

[0012] Preferably, the toothed structure includes a threaded tooth portion and a spike tooth portion, and the threaded tooth portion and the spike tooth portion are symmetrically arranged around the screw segment, and the give way groove includes a first arc groove and a second arc groove, and the first arc groove is correspondingly arranged on the outer periphery of the threaded tooth portion, and the second arc groove is correspondingly arranged on the outer periphery of the spike tooth portion.

[0013] Preferably, the thread tooth portion includes a plurality of arc-shaped pieces extending spirally along the circumferential direction, and the plurality of arc-shaped pieces are evenly arranged and spaced apart from each other. The spike tooth portion includes a plurality of conical spike teeth, and the plurality of conical spike teeth are spaced apart and spaced apart from each other and arranged circumferentially around the screw.

[0014] Preferably, the elastic gasket is a rubber gasket.

[0015] Preferably, the screw is a grounding screw made of metal.

[0016] The technical effects achieved by the technical solution of the utility model mainly include:

[0017] When the screws of the above-mentioned electrical equipment are installed on the mounting surface such as the metal housing, the downward pressure applied by the nut on the elastic washer can cause the elastic washer to be squeezed and deformed, and the outer peripheral edge of the elastic washer can be easily turned up and expanded by means of the deformation gap, exposing the toothed structure in the clearance groove, and the toothed structure can break and scrape off the insulation layer of the mounting surface with the rotation of the nut, so that the grounding wire can be connected with the metal structure of the electrical equipment through the screw, and after the screw is tightened, the lower end face of the elastic washer is tightly pressed on the mounting surface, and the elastic washer cooperates with the nut above to cover the metal structure broken by the toothed structure, isolate the intrusion of external air, and prevent oxidation corrosion after long-term use;

[0018] The elastic washer is clamped between the nut and the mounting surface to play a buffering and protective role, avoiding excessive damage to the mounting surface. The elastic washer shields the broken metal structure and avoids affecting the appearance of the electrical equipment.

[0019] The toothed structure breaks through the insulating layer on the mounting surface and can be embedded therein. The toothed structure and the elastic washer together increase the friction between the screw and the mounting surface, thereby preventing the screw from rotating and loosening. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a three-dimensional structural diagram corresponding to the screws of the electrical equipment provided by the embodiment of the utility model;

[0021] Figure 2 is a side view of the screw.

[0022] The reference numerals in the above drawings are:

[0023] The nut 1, the inner end surface 1a of the nut, the toothed structure 11, the threaded tooth portion 111, the spike tooth portion 112, the screw segment 2, the elastic washer 3, the clearance groove 30, the outer peripheral edge 31 of the elastic washer, and the deformation gap position 310. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the specific embodiments of the utility model are described in detail below in conjunction with the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the utility model shown in the accompanying drawings and described according to the accompanying drawings are merely exemplary, and the utility model is not limited to these embodiments.

[0025] It should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only 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 very relevant are omitted.

[0026] Reference Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a screw for an electrical device, which includes a nut 1, a screw rod section 2 and an elastic washer 3.

[0027] A toothed structure 11 is provided on the inner end surface 1a of the nut 1; the screw segment 2 is connected to the inner end surface 1a of the nut 1; the elastic washer 3 is sleeved on the screw segment 2, the elastic washer 3 abuts against the inner end surface 1a of the nut 1, and a clearance groove 30 is opened on the elastic washer 3 to make way for the toothed structure 11 of the nut 1, so that the toothed structure 11 is hidden in the clearance groove 30.

[0028] Among them, Figure 2 As shown, the outer peripheral edge 31 of the elastic washer 3 extends from the inner end surface 1a of the nut 1, and is away from the inner end surface 1a of the nut 1 in an inclined direction of outward expansion, forming a deformation gap position 310, so that the outer peripheral edge 31 of the elastic washer 3 is separated from the inner end surface 1a of the nut 1, so that the toothed structure 11 is exposed outside the clearance groove 30 when the elastic washer 3 is deformed by force.

[0029] When the screw provided in the embodiment of the utility model is installed on the metal shell or sheet metal surface of the electrical equipment, the downward pressure applied by the nut 1 on the elastic washer 3 can cause the elastic washer 3 to be squeezed and deformed. The outer peripheral edge 31 of the elastic washer 3 is easy to turn up and expand with the help of the deformation gap 310, exposing the tooth structure 11 in the clearance groove 30. The tooth structure 11 can break and scrape off the insulation layer of the installation surface with the rotation of the nut 1, so that the grounding wire can be well connected with the metal structure of the electrical equipment through the screw. After tightening the screw, the lower end face of the elastic washer 3 is pressed tightly on the installation surface. The elastic washer 3 cooperates with the nut 1 above to cover the metal structure broken by the tooth structure 11, isolate the intrusion of external air, and prevent oxidation corrosion after long-term use.

[0030] The elastic washer 3 is clamped between the nut 1 and the mounting surface, and can play a role of buffer protection, avoid causing excessive cracks in the mounting surface, cover the broken metal structure, and avoid affecting the appearance of the electrical equipment.

[0031] The tooth-shaped structure 11 is embedded in the clearance groove 30 , so that the space in the clearance groove 30 can accommodate the insulation layer debris scraped off by the tooth-shaped structure 11 .

[0032] The toothed structure 11 breaks the insulating layer on the mounting surface and contacts the mounting surface together with the elastic washer 3, thereby increasing the friction force and preventing the screw from rotating and loosening.

[0033] Along the axial direction of the screw segment 2 on the inner end surface 1a of the nut 1, the thickness of the toothed structure 11 is equal to the depth of the clearance groove 30, that is, the lower end surface of the elastic washer 3 is flush with the lower tip of the toothed structure 11, so that the toothed structure 11 can be hidden in the clearance groove 30, and can be easily exposed when the elastic washer 3 is deformed.

[0034] In this embodiment, the toothed structure 11 is integrally formed with the nut 1. With the toothed structure 11, there is no need to manually set a toothed gasket on the screw, and the toothed structure 11 fixed on the nut 1 can more stably break the insulating layer of the installation surface, simplifying the installation steps.

[0035] Specifically, the tooth structure 11 includes a threaded tooth portion 111 and a spike tooth portion 112, and the threaded tooth portion 111 and the spike tooth portion 112 are symmetrically arranged around the screw segment 2, and the clearance groove 30 includes a first arc groove and a second arc groove, and the first arc groove is correspondingly arranged at the outer periphery of the threaded tooth portion 111, and the second arc groove is correspondingly arranged at the outer periphery of the spike tooth portion 112. The threaded tooth portion 111 and the spike tooth portion 112 are arranged with different tooth shapes and are centrally symmetrical about the center of the nut 1. With the rotation of the screw, the threaded tooth portion 111 and the spike tooth portion 112 alternately scrape the insulating layer of the mounting surface, so that the threaded tooth portion 111 and the spike tooth portion 112 can play a complementary role, so that the efficiency of breaking the insulating layer is higher, and it caters to different insulating layer structures.

[0036] Furthermore, the thread tooth portion 111 includes a plurality of arc-shaped pieces extending spirally along the circumferential direction, and the plurality of arc-shaped pieces are evenly arranged at intervals from each other. The spike tooth portion 112 includes a plurality of conical spike teeth, and the plurality of conical spike teeth are arranged circumferentially around the screw rod at intervals from each other.

[0037] For example, the elastic gasket 3 is a rubber gasket. The rubber gasket is elastic enough and durable, and is easy to process to form the corresponding clearance groove 30, which is beneficial to reduce the material cost and processing cost.

[0038] Since the grounding wire needs to be connected to the metal structure of the electrical equipment through the screw, the above-mentioned screw is a grounding screw made of metal.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0040] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A screw for electrical equipment, characterized in that: include: A nut (1), wherein a tooth-shaped structure (11) is provided on an inner end surface (1a) of the nut (1); A screw segment (2), wherein the screw segment (2) is connected to the inner end surface (1a) of the nut (1); An elastic washer (3), the elastic washer (3) being sleeved on the screw segment (2), the elastic washer (3) being in contact with the inner end surface (1a) of the nut (1), and the elastic washer (3) being provided with a clearance groove (30) for the toothed structure (11) of the nut (1), so that the toothed structure (11) is hidden in the clearance groove (30). The outer peripheral edge (31) of the elastic washer (3) extends from the inner end surface (1a) of the nut (1) in an outwardly expanding inclined direction away from the inner end surface (1a) of the nut (1), forming a deformation gap (310), so that the outer peripheral edge (31) of the elastic washer (3) is spaced from the inner end surface (1a) of the nut (1), so that when the elastic washer (3) is deformed by force, the toothed structure (11) is exposed outside the clearance groove (30).

2. The screw for electrical equipment according to claim 1, characterized in that: In the axial direction of the screw segment (2) along the inner end surface (1a) of the nut (1), the thickness of the toothed structure (11) is equal to the depth of the clearance groove (30).

3. The screw for electrical equipment according to claim 1, characterized in that: The toothed structure (11) and the nut (1) are integrally formed.

4. The screw for electrical equipment according to claim 1, characterized in that: The toothed structure (11) comprises a threaded tooth portion (111) and a spike tooth portion (112), wherein the threaded tooth portion (111) and the spike tooth portion (112) are symmetrically arranged around the screw segment (2), and the clearance groove (30) comprises a first arc-shaped groove and a second arc-shaped groove, wherein the first arc-shaped groove is correspondingly arranged on the outer periphery of the threaded tooth portion (111), and the second arc-shaped groove is correspondingly arranged on the outer periphery of the spike tooth portion (112).

5. The screw for electrical equipment according to claim 4, characterized in that: The thread tooth portion (111) comprises a plurality of arc-shaped pieces extending in a spiral shape along the circumferential direction, and the plurality of arc-shaped pieces are evenly arranged at intervals from each other. The spike tooth portion (112) comprises a plurality of conical spike teeth, and the plurality of conical spike teeth are arranged at intervals from each other in the circumferential direction of the screw rod.

6. The screw for electrical equipment according to claim 1, characterized in that: The elastic gasket (3) is a rubber gasket.

7. The screw for electrical equipment according to claim 1, characterized in that: The screw is a grounding screw made of metal.

Images