Heat-resistant nut used in high-temperature environment

Abstract

The utility model relates to the technical field of fasteners, and discloses a heat-resistant nut used in a high-temperature environment, which comprises an outer-layer nut, one side of the inner part of the outer-layer nut is provided with a variable-diameter thread groove, one side of the inner part of the outer-layer nut is provided with a plurality of vertical heat dissipation grooves, and the inner part of the outer-layer nut is fixedly connected with an inner-layer nut. According to the utility model, the variable-diameter thread groove is formed in the outer-layer nut, so that threads of all parts can bear stress generated by thermal expansion and cold contraction more uniformly, and the vertical heat dissipation grooves are further formed in the outer-layer nut, so that hot air can form convection in the grooves, heat dissipation is accelerated, and the heat dissipation efficiency is improved. Due to the fact that the inner-layer nut is arranged in the outer-layer nut, the high temperature resistance of the nut is comprehensively improved under the nesting of the inner layer and the outer layer, and the effect of high heat resistance in the high-temperature environment is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fastener especially relates to a heat -resisting nut for high temperature environment. BACKGROUND

[0002] High temperature environment refers to the environment whose temperature exceeds the range usually borne in conventional life and work environment. Nut is a common mechanical fastener, usually used with bolt, screw, for connecting two and multiple components together, is a hexagonal metal part with internal thread, usually made of steel, aluminum, copper and other metal materials, the internal thread of nut can match the external thread of bolt and screw, and the connected components are firmly fixed together by rotating nut through friction force and locking force, its working principle is to utilize the mechanical effect of thread to convert the applied rotating force into axial tension and pressure, thereby ensuring that the connected components will not loosen and shift.

[0003] Nut is usually made of single structure material, designed to cooperate with bolt, and fastened and fixed through the interaction of thread, the internal thread of nut is engaged with the external thread of bolt, and the connected components are firmly fixed together by friction force and locking force when tightened, its working principle is to utilize the mechanical effect of thread to convert the applied rotating force into axial tension and pressure, thereby ensuring that the connected components will not loosen and shift.

[0004] In the prior art, most of the nuts have insufficient heat resistance in high temperature environment, which limits their use in high temperature working conditions. Traditional nuts are usually made of single material, which has good strength and stability at room temperature, but under high temperature conditions, the thermal expansion, strength reduction and oxidation of the material will significantly affect its performance, leading to failure of the nut. Therefore, a heat-resistant nut for high temperature environment is proposed to solve the above problems. SUMMARY

[0005] The utility model provides a heat -resisting nut for high temperature environment, aims at improving the problem that part nut cannot be heat -resistant in high temperature environment in prior art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme:

[0007] A heat -resisting nut for high temperature environment, including the outer layer nut, the inside one side of outer layer nut is equipped with the variable diameter thread groove, the inside one side of outer layer nut is equipped with a plurality of vertical heat dissipation grooves, the inside fixed connection of outer layer nut has the inner layer nut.

[0008] Further description of the above technical scheme:

[0009] The outer fixed connection of outer layer nut has heat -resisting layer, the inside fixed connection of outer layer nut has electroplated layer.

[0010] Further description of the above technical scheme:

[0011] The variable diameter thread groove is a variable diameter thread, the thread diameter near the nut head is slightly larger, and gradually decreases towards the tail.

[0012] The utility model has the advantages of the following beneficial effects:

[0013] In the utility model, the variable diameter thread groove in the outer layer nut enables the threads of each part to bear the stress caused by thermal expansion and cold contraction more uniformly, and the inner part of the outer layer nut is also provided with a plurality of vertical heat dissipation grooves, so that the hot air can form convection in the groove and accelerate heat dissipation, and because the inner part of the outer layer nut also has the inner layer nut, the high temperature resistance of the nut is improved under the nesting of the inner and outer layers, and the high heat resistance effect in a high temperature environment is realized. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 A perspective view of the heat-resistant nut for high temperature environment is provided for the utility model;

[0015] Fig. 2 A vertical groove structure schematic view of the heat-resistant nut for high temperature environment is provided for the utility model;

[0016] Fig. 3 A heat-resistant layer structure schematic view of the heat-resistant nut for high temperature environment is provided for the utility model.

[0017] LEGEND:

[0018] 1, outer layer nut; 2, variable diameter thread groove; 3, vertical heat dissipation groove; 4, inner layer nut; 5, heat-resistant layer; 6, electroplated layer. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] REFERENCE Figs. 1 to 3The utility model provides a kind of embodiment: a kind of heat-resistant nut for high temperature environment, including outer nut 1, overall is the standard hexagonal prism shape, material selects high-strength heat-resistant alloy, such as nickel-based alloy, this alloy can still keep good strength and hardness under high temperature environment, with excellent oxidation resistance and thermal fatigue resistance, effectively prevent deformation, fracture and other problems under high temperature, ensure the reliability of nut in long-term high temperature use process, the inside one side of outer nut 1 is provided with variable-diameter thread groove 2, variable-diameter thread groove 2 is spiral, variable-diameter thread groove 2 is variable-diameter thread, the diameter of thread near nut head is slightly larger, gradually decreases to tail portion, to adapt to the different expansion coefficients of bolt and nut under high temperature environment, ensure that thread connection is still tightly reliable when temperature changes, avoid the loosening phenomenon caused by thermal expansion and contraction, the inside one side of outer nut 1 is provided with multiple vertical heat dissipation grooves 3, vertical heat dissipation grooves 3 are evenly distributed in the inside one side of nut, main role is to increase the heat dissipation area inside nut, under high temperature environment, heat can be dissipated more quickly through these vertical heat dissipation grooves 3, effectively reduce the temperature of nut, prevent performance degradation due to temperature being too high, the inside of outer nut 1 is fixedly connected with inner nut 4, inner nut 4 is cylinder shape, material is copper alloy with good high-temperature resistance, copper alloy has excellent thermal conductivity, can quickly transfer heat, while having certain strength and wear resistance, can work stably under high temperature environment.

[0021] The outside of outer nut 1 is fixedly connected with heat-resistant layer 5, which is made of high-performance ceramic material, ceramic material has very low thermal conductivity and excellent high-temperature resistance, can effectively block external high temperature from transmitting to nut body, play a good heat insulation effect, protect outer nut 1 from being affected by too much heat under high temperature environment, maintain its normal mechanical properties, the inside of outer nut 1 is fixedly connected with electroplated layer 6, electroplated layer 6 selects metal with good corrosion resistance, such as zinc or chromium, main role is to prevent the inside of nut from being corroded, especially in high temperature and corrosive gas or liquid environment, electroplated layer 6 can effectively isolate the corrosion medium between nut body and outside, prolong the service life of nut, ensure that nut can still work normally under complex high temperature environment.

[0022] Working principle: first, the outer nut 1 adopts heat-resistant alloy material, such as nickel-based alloy, which keeps good mechanical strength and hardness at high temperature, and is designed with variable pitch thread groove 2, which helps to adapt to different expansion coefficients, and ensures that the bolt and nut remain tightly connected when the temperature changes. In addition, the nut is provided with a plurality of vertical heat dissipation grooves 3, which help to increase the internal heat dissipation area, so that the heat can be dissipated faster in high temperature working environment, and the inner nut 4 in the outer nut 1 is made of copper alloy, which has high thermal conductivity and helps to quickly transfer heat while maintaining the stability and wear resistance of the nut, and the outer nut 1 is additionally provided with a layer of heat-resistant ceramic layer, which has low thermal conductivity and high temperature resistance, effectively blocks the entry of external heat, protects the internal structure of the nut from high temperature, and finally, the nut is coated with a layer of electroplated layer 6, such as zinc, which is mainly used to prevent the nut from being corroded in high temperature and corrosive environment, prolonging its service life.

[0023] Finally, it should be pointed out that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application are described in detail, for those skilled in the art, it still can be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of protection of the present application.

Claims

1. A heat-resistant nut for high temperature environments, comprising an outer nut (1), characterized in that: The inside of the outer nut (1) is provided with a variable diameter thread groove (2), the inside of the outer nut (1) is provided with a plurality of vertical heat dissipation grooves (3), and the inside of the outer nut (1) is fixedly connected with an inner nut (4).

2. A heat resistant nut for high temperature environments according to claim 1, characterized in that: The outside of the outer nut (1) is fixedly connected with a heat-resistant layer (5), and the inside of the outer nut (1) is fixedly connected with an electroplated layer (6).

3. The heat resistant nut for high temperature environment according to claim 1, wherein: The variable diameter thread groove (2) is a variable diameter thread, and the thread diameter near the nut head is slightly larger, gradually decreasing to the tail.

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