RU235079U1 - Reversible thermochromic attachment for bolted joint - Google Patents

Abstract

The utility model relates to mechanical engineering, power engineering, construction and other technical areas where overheating of a bolted joint is possible and visual monitoring of its temperature is required. A reversible thermochromic attachment to a bolted joint comprises a housing made of a thermochromic material that changes colour when the temperature rises and returns to its original state when it falls, wherein the housing is designed to cover a nut of a bolted joint corresponding to its size, and the thermochromic material has a reversible temperature dependence in the range of operating temperatures of the bolted joint, wherein the attachment is manufactured in sizes adapted for bolted joints with nut sizes from M6 to M30. The technical result: visual monitoring of the temperature of a bolted joint in real time is ensured, the reliability and safety of the joints is increased, the need to replace the indicator after overheating is eliminated, and maintenance is simplified. 2 sec. fils, 4 figs.

Description

Scope of application

The utility model relates to the field of mechanical engineering, energy, construction and other technical areas where visual control of the temperature of bolted connections is required. The device is designed to detect overheating and prevent potential equipment failures caused by excessive heating of contact connections.

State of the art

Devices for controlling the heating of contact connections are known, for example:

1. Patent for inventions No. 2800396 "Device for visual recording of excess temperature and method of its manufacture (variants)".

2. Patent for utility model No. 213269 "Device for marking elements of electrical equipment for recording the maximum overheating temperature of the equipment surface".

3. Patent for utility model No. 220294 "Irreversible temperature indicator with a low-molecular temperature-sensitive element".

4. Patent for utility model No. 221997 "Irreversible thermal indicator sticker".

Existing solutions are irreversible in terms of thermochromic properties, as well as in design (stickers), which requires their replacement after reaching a critical temperature. This leads to additional costs and complication of maintenance. The utility model eliminates these disadvantages, providing a reversible temperature indication that retains functionality after cooling. Also, due to the shape of the nozzle, it is possible to install it in a place with the maximum heat source (contact connection), since the conductor insulation gives a temperature difference of 30-60 ° C between the surface and the metal directly. The analogue is mainly installed on wires, buses, etc. Also, the adhesive properties of the stickers deteriorate at negative temperatures, the proposed solution does not have this drawback.

The essence of the utility model

The utility model is a thermochromic attachment installed on a nut. The attachment contains a housing made of Elegoo Thermochromic Resin photopolymer material that changes color when the temperature increases and returns to its original state when it decreases, while the housing is designed to cover the nut of the bolted connection corresponding to its size, and the thermochromic material has a reversible temperature dependence in the range of operating temperatures of the bolted connection, while the attachment is manufactured in sizes adapted for bolted connections with nuts from M6 to M30.

The attachment is hexagonal in shape and contains an internal hole designed for secure fixation on the nut and a through hole allowing the bolt stud to pass through. The outer and inner surfaces are chamfered.

Technical result

Provides visual control of the condition of bolted connections in real time.

Eliminates the need to replace the indicator after overheating.

The reliability and safety of technical systems is increased.

Maintenance costs are reduced.

Example of implementation of a utility model

The nozzle is made of photopolymer material (Elegoo Thermochromic Resin). A stereolithographic 3D printer is used to manufacture the nozzle, which ensures high accuracy and repeatability of the shape. For use, the nozzle is put on a nut, which is usually an element of some contact connection. The color change of the thermochromic material begins at 50°C.

Brief description of the drawings

The product can be manufactured in various sizes, corresponding to GOST 5915-70 (nut sizes), taking into account the necessary size increases for convenience. The parameters are presented in the following Table

The drawings represent a frontal (Fig. 1), horizontal (Fig. 2), profile (Fig. 3) projection and a 3-dimensional view of the part (Fig. 4).

The numbering of the models depends on the dimensions, for example, the A8 part is similar to the dimensions of the M8 nut with the necessary increments of the dimensions ∆e, ∆S, ∆d. Otherwise, the shapes of the part are similar to the one presented.

Conclusion

The reversible thermochromic bolt attachment provides a reliable, cost-effective and easy way to monitor temperature, increasing the safety and efficiency of technical systems.

Claims (3)

1. A reversible thermochromic attachment for a bolted joint, comprising a housing made of Elegoo Thermochromic Resin photopolymer material that changes colour when the temperature rises and returns to its original state when it falls, wherein the housing is designed to cover a nut of a bolted joint corresponding to its size, and the thermochromic material has a reversible temperature dependence in the range of operating temperatures of the bolted joint, wherein the attachment is manufactured in sizes adapted for bolted joints with nuts. 2. The nozzle according to item 1, characterized in that the color change of the thermochromic material begins at 50°C. 3. The nozzle according to item 1, characterized in that it is manufactured in sizes adapted for bolted connections with nut sizes from M6 to M30.