Fusible plug safe to use

Abstract

The utility model discloses a fusible plug safe to use, which belongs to the technical field of fusible plugs and comprises a plug cap, a plug body is arranged at the upper end of the plug cap, a threaded portion is arranged on the surface of the plug body, a plug core is arranged inside one end, far away from the plug cap, of the plug body, and a fusible metal filling layer is arranged between the plug core and the plug body. An airflow channel is arranged in the plug body in a penetrating manner; the mode that the red copper plug core is matched with the fusible metal to fill the pressure relief hole is adopted, the heat conduction performance of red copper is better, only a small amount of fusible metal needs to be used, the fusible metal can be rapidly melted when the temperature reaches the melting point, the middle of the plug core is hollowed out, it is guaranteed that heating is even and rapid, and the safety performance of the fusible plug is greatly improved; the red copper plug core is installed on the protruding part of the plug body, the purpose of rapid heat conduction is achieved, the safety performance of the fusible plug is improved, meanwhile, the C-shaped groove is designed in the inner wall of the plug body, the safety performance is guaranteed, and meanwhile the compression strength of the fusible plug is not lost.

Description

Technical Field

[0001] The utility model belongs to the technical field of fusible plugs, and in particular relates to a fusible plug that is safe to use. Background Art

[0002] The fusible plug utilizes the low melting point alloy in the device to melt at a higher temperature, opening the channel to allow the gas to be discharged from the holes originally filled with the fusible alloy to release the pressure. It is characterized by simple structure, easy replacement, and the action pressure determined by the melting temperature is easier to control.

[0003] The existing fusible plug adopts a method of filling the pressure relief hole with a fusible alloy as a whole. Although this method is simple, it greatly reduces the performance of the fusible plug, because the fusible plug works by dissolving the fusible metal in the fusible plug at an overtemperature to open the pressure relief hole. The overall filling of the fusible metal will cause the fusible metal to melt layer by layer, which reduces the sensitivity of the fusible plug and is very prone to safety accidents. In addition, a rubber and plastic O-ring is used for sealing. This sealing ring has poor oil resistance, is easily deformed at high temperatures, and is prone to aging and cracking. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a fusible plug which is safe to use and has the characteristics of uniform and rapid heating and long service life.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safe fusible plug, comprising a plug cap, a plug body is arranged at the upper end of the plug cap, a threaded portion is arranged on the surface of the plug body, a plug core is arranged inside the end of the plug body away from the plug cap, a fusible metal filling layer is arranged between the plug core and the plug body, and an airflow channel is arranged through the inside of the plug body.

[0006] Preferably, an aluminum gasket is provided on the upper end surface of the plug cap corresponding to the plug body.

[0007] Preferably, a C-shaped groove is provided inside the plug body corresponding to the fusible metal filling layer.

[0008] Preferably, a limit stop ring is provided on the inner wall surface of the plug body, and a spring sheet is provided on one side of the limit stop ring.

[0009] Preferably, a wire groove is provided on one end surface of the plug body, a steel wire rope is provided inside the wire groove, and one end of the steel wire rope is connected to the surface of the plug core.

[0010] Preferably, the plug core is made of red copper, and the interior of the plug core is configured as a hollow structure.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model adopts a method of using a red copper plug core in combination with a fusible metal to fill the pressure relief hole. Red copper has better thermal conductivity and only needs a small amount of fusible metal. When the temperature of the fusible metal reaches the melting point, it will melt rapidly. The middle of the plug core is hollowed out to ensure uniform and rapid heating, thereby greatly improving the safety performance of the fusible plug. The red copper plug core is installed on the protruding part of the plug body to achieve the purpose of rapid heat conduction, thereby improving the safety performance of the fusible plug. At the same time, a C-shaped groove is designed on the inner wall of the plug body. While using a small amount of fusible metal to ensure safety performance, the compressive strength of the fusible plug is not lost. An aluminum gasket is used for sealing, which has the advantages of corrosion resistance, high temperature resistance, and vibration and impact relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a structural sectional view of the utility model;

[0015] Figure 3 This is a schematic diagram of the structure of point A of the present utility model.

[0016] In the figure: 1. plug cap; 2. aluminum washer; 3. threaded part; 4. plug body; 5. wire groove; 6. fusible metal filling layer; 7. plug core; 8. wire rope; 9. air flow channel; 10. limit stop ring; 11. spring piece. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3 The utility model provides the following technical solutions: a safe fusible plug, comprising a plug cap 1, a plug body 4 is arranged at the upper end of the plug cap 1, a threaded portion 3 is arranged on the surface of the plug body 4, a plug core 7 is arranged inside the end of the plug body 4 away from the plug cap 1, a fusible metal filling layer 6 is arranged between the plug core 7 and the plug body 4, and an air flow channel 9 is arranged through the inside of the plug body 4.

[0019] Specifically, an aluminum washer 2 is provided on the upper end surface of the plug cap 1 corresponding to the plug body 4 .

[0020] By adopting the above technical solution, the aluminum gasket 2 is resistant to corrosion and high temperature, and can alleviate vibration and impact, thereby improving the stability and firmness of the product after installation.

[0021] Specifically, a C-shaped groove is provided inside the plug body 4 corresponding to the fusible metal filling layer 6 .

[0022] By adopting the above technical solution, the safety performance of the product is guaranteed while the pressure resistance of the product is not lost, thereby improving the sealing quality.

[0023] Specifically, a limit stop ring 10 is provided on the inner wall surface of the plug body 4 , and a spring piece 11 is provided on one side of the limit stop ring 10 .

[0024] By adopting the above technical solution, the plug core 7 can be easily ejected after the fusible metal filling layer 6 melts, thereby preventing the plug core 7 from blocking the airflow channel 9.

[0025] Specifically, a wire groove 5 is provided on the surface of one end of the plug body 4 , a steel wire rope 8 is provided inside the wire groove 5 , and one end of the steel wire rope 8 is connected to the surface of the plug core 7 .

[0026] By adopting the above technical solution, the plug core 7 can be pulled and limited in time to prevent the plug core 7 from directly falling and being lost and unable to be reused, thereby saving the use cost.

[0027] Specifically, the plug core 7 is made of red copper, and the interior of the plug core 7 is configured as a hollow structure.

[0028] By adopting the above technical solution, the thermal conductivity is improved, the production cost and the use cost are reduced, and the sensitivity of the product is improved.

[0029] Working principle and use process of the utility model: when the utility model is in use, when the oil in the working chamber of the hydraulic coupling reaches the set temperature, the fusible metal filling layer 6 inside the plug body 4 melts, and at this time the spring piece 11 pops out the plug core 7 from the inside of the plug body 4 to prevent the plug core 7 from blocking the airflow channel 9, and the popped-out plug core 7 is at the lower limit of the pulling of the wire rope 8 to prevent it from being lost. At this time, the oil in the working chamber of the hydraulic coupling is sprayed out through the airflow channel 9 inside the plug body 4, so that the hydraulic coupling stops working. If the hydraulic coupling is to be restored to work, the hydraulic coupling must be refilled with oil and a new fusible plug must be replaced.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safe fusible plug, comprising a plug cap, characterized in that: A plug body is arranged at the upper end of the plug cap, a threaded portion is arranged on the surface of the plug body, a plug core is arranged inside the end of the plug body away from the plug cap, a fusible metal filling layer is arranged between the plug core and the plug body, and an air flow channel is arranged through the inside of the plug body.

2. A safe fusible plug according to claim 1, characterized in that: An aluminum washer is arranged on the upper end surface of the plug cap corresponding to the plug body.

3. A safe fusible plug according to claim 1, characterized in that: A C-shaped groove is arranged inside the plug body corresponding to the fusible metal filling layer.

4. A safe fusible plug according to claim 1, characterized in that: A limit stop ring is arranged on the inner wall surface of the plug body, and a spring piece is arranged on one side of the limit stop ring.

5. The safe fusible plug according to claim 1, characterized in that: A wire groove is arranged on the surface of one end of the plug body, a steel wire rope is arranged inside the wire groove, and one end of the steel wire rope is connected to the surface of the plug core.

6. A safe fusible plug according to claim 1, characterized in that: The plug core is made of red copper, and the interior of the plug core is arranged as a hollow structure.

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