Elbow for explosion-proof conduit

Abstract

The utility model discloses a kind of elbow applied to explosion-proof line pipe, belong to pipeline connecting piece technical field, including elbow body and the fixed interface and movable interface of both ends thereof, fixed interface is connected with the shell of electrical equipment by first connecting structure, movable interface is connected with explosion-proof line pipe by second connecting structure, first connecting structure and shell between, second connecting structure and explosion-proof line pipe between are equipped with explosion-proof sealing ring. By first connecting structure and second connecting structure installation fixed interface and movable interface in elbow body both ends, it can be realized with the connection of electrical equipment shell and explosion-proof line pipe, while in first connecting structure and shell between, second connecting structure and explosion-proof line pipe between are realized sealing by explosion-proof sealing ring. By first connecting structure, second connecting structure and explosion-proof sealing ring, the reliable connection of elbow and shell and explosion-proof line pipe can be realized using the utility model, meet the explosion-proof requirement, to improve the safety factor of line.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipe connectors, and in particular relates to an elbow used in explosion-proof conduits. Background Technology

[0002] Explosion-proof conduit is a specialized electrical wiring protection device designed for use in hazardous explosive environments, ensuring the normal operation of electrical circuits and equipment. Currently, although explosion-proof conduits exist, the connectors at the conduit joints are mostly ordinary pipe fittings, lacking dedicated explosion-proof connectors. This fails to meet explosion-proof requirements and poses certain safety hazards. Utility Model Content

[0003] The purpose of this invention is to provide an elbow for use in explosion-proof conduits, aiming to solve the technical problem that existing pipe fittings do not meet explosion-proof requirements.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] An elbow for use in explosion-proof conduit includes a bend body and fixed and movable interfaces at both ends. The fixed interface is connected to the housing of an electrical device through a first connecting structure, and the movable interface is connected to the explosion-proof conduit through a second connecting structure. Explosion-proof sealing rings are provided between the first connecting structure and the housing, and between the second connecting structure and the explosion-proof conduit.

[0006] Preferably, the first connection structure includes a fixed bolt and a movable nut. The fixed bolt is fixed to the end of the fixed interface, the fixed bolt passes through the housing, and the nut of the fixed bolt is located on the outside of the housing. The movable nut is threaded with the fixed bolt and is located on the inside of the housing. The explosion-proof sealing ring is fitted onto the fixed bolt and is located between the movable nut and the housing. The movable nut is used to fix the fixed interface to the housing.

[0007] Furthermore, the fixing bolt is welded and fixed to the end of the fixing interface.

[0008] Furthermore, the outer circle of the nut of the fixing bolt is evenly distributed with multiple planes, and the outer edge of the movable nut is raised towards the inside of the housing and evenly distributed with multiple protrusions.

[0009] Preferably, the second connection structure includes a pipe joint, a movable end joint, and a snap fastener. The upper part of the pipe joint is fixedly fitted onto the end of the explosion-proof conduit, and the lower part of the pipe joint is provided with an external thread that mates with the movable end joint. The upper end of the movable end joint is provided with an internal thread that mates with the pipe joint, and the lower part of the movable end joint is snapped together with the snap fastener, which is fixedly connected to the movable interface. An explosion-proof sealing ring is provided between the pipe joint and the movable end joint.

[0010] Preferably, the buckle is a tube with an annular groove in the middle of its outer circle, and the lower inner wall of the movable end connector has an annular groove that mates with the upper part of the buckle.

[0011] Furthermore, a gap is provided between the bottom of the annular groove and the upper end face of the buckle; the height of the inner boss at the lower end of the annular groove of the movable end connector is less than the height of the annular groove on the buckle.

[0012] Preferably, the buckle is welded and fixed to the end of the movable interface.

[0013] Preferably, the upper part of the pipe joint is pressed and fixed to the end of the explosion-proof conduit by a hydraulic press, and the lower part of the movable end joint is pressed and fixed together with the buckle by a hydraulic press.

[0014] Preferably, the included angle between the central axes of the fixed interface and the movable interface is 90 degrees.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention enables connection to electrical equipment housings and explosion-proof conduits by installing a first connecting structure and a second connecting structure at fixed and movable interfaces at both ends of the bent pipe body. Simultaneously, explosion-proof sealing rings achieve sealing between the first connecting structure and the housing, and between the second connecting structure and the explosion-proof conduit. This invention, through the first connecting structure, the second connecting structure, and the explosion-proof sealing rings, achieves a reliable connection between the bent pipe and the housing and explosion-proof conduit, meeting explosion-proof requirements and thus improving the safety factor of the circuit. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] In the attached diagram:

[0019] Figure 1 A schematic diagram of the structure of an elbow applied to an explosion-proof conduit, provided for an embodiment of this utility model;

[0020] Figure 2 This is a schematic diagram illustrating the application state of the bent pipe in this embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the pipe connector in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the movable end connector in an embodiment of this utility model;

[0023] Figure 5This is a schematic diagram of the buckle structure in an embodiment of the present utility model;

[0024] In the picture:

[0025] 1-Bend body; 2-Shell; 3-Explosion-proof conduit; 4-Explosion-proof sealing ring; 5-Fixing bolt; 6-Modible nut; 7-Nut; 8-Flat surface; 9-Eaves; 10-Pipe fitting; 11-Modible end fitting; 12-Snap fastener. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. In the following detailed description of the invention, certain specific details are described in detail. However, those skilled in the art will fully understand the invention for any parts not described in detail.

[0027] Furthermore, those skilled in the art should understand that the accompanying drawings are provided only to illustrate the purpose, features, and advantages of the present invention, and are not actually drawn to scale.

[0028] Furthermore, unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to."

[0029] like Figure 1 , Figure 2 As shown in the figure, an embodiment of this utility model provides an elbow for use in explosion-proof conduits, including an elbow body 1 and fixed and movable interfaces at both ends. The fixed interface is connected to the housing 2 of an electrical device through a first connecting structure, and the movable interface is connected to the explosion-proof conduit 3 through a second connecting structure. Explosion-proof sealing rings 4 are provided between the first connecting structure and the housing 2, and between the second connecting structure and the explosion-proof conduit 3. The explosion-proof sealing rings can seal the adjacent mating surfaces.

[0030] In specific embodiments of this utility model, such as Figure 1As shown, the first connection structure includes a fixing bolt 5 and a movable nut 6. The fixing bolt 5 is welded and fixed to the end of the fixing interface. The fixing bolt 5 penetrates the housing 2, and the nut of the fixing bolt 5 is located on the outside of the housing 2. The movable nut 6 is threaded with the fixing bolt 5 and is located on the inside of the housing 2. The explosion-proof sealing ring 4 is fitted onto the fixing bolt 5 and is located between the movable nut 6 and the housing 2. The movable nut 6 is used to fix the fixing interface to the housing 2. The clamping force between the movable nut and the fixing bolt fixes the fixing interface end of the bent pipe body to the housing of the equipment.

[0031] The above structure is further optimized by having multiple planes 8 evenly distributed on the outer circumference of the nut 7 of the fixing bolt 5, and the outer edge of the movable nut 6 protruding towards the inner side of the housing 2 and having multiple protrusions 9 evenly distributed. During assembly, the wrench can apply torque to the fixing bolt through the planes on the nut, and the wrench can easily apply torque to the movable nut through the protrusions to achieve quick installation.

[0032] In specific embodiments of this utility model, such as Figure 2 , 3 As shown in Figure 4, the second connection structure includes a pipe connector 10, a movable end connector 11, and a snap fastener 12. The upper part of the pipe connector 10 is fixedly fitted onto the end of the explosion-proof conduit 3, and the two are tightly fitted together. The inner wall of the middle part of the pipe connector 10 is provided with a step 13 that abuts against the end of the explosion-proof conduit 3. The lower part of the pipe connector 10 is provided with an external thread that mates with the movable end connector 11. The upper end of the movable end connector 11 is provided with an internal thread that mates with the pipe connector 10. The lower part of the movable end connector 11 is snapped into place with the snap fastener 12, which is welded and fixed to the end of the movable interface. An explosion-proof sealing ring 4 is provided between the pipe connector 10 and the movable end connector 11. During assembly, the pipe connector and the movable end connector are threaded together, and the movable end connector is snapped into place with the snap fastener, which facilitates quick installation. At the same time, the explosion-proof conduit can rotate relative to the snap fastener, preventing the explosion-proof conduit from twisting after installation.

[0033] In the specific production process, such as Figure 4 , 5 As shown, the buckle 12 is a tube with an annular groove 14 in the middle of its outer circle. The lower inner wall of the movable end connector 11 is provided with an annular groove 15 that mates with the upper part of the buckle 12. The outer circle of the movable end connector 11 is evenly distributed with multiple planes 8 that mate with a wrench, so that torque can be applied to it by a wrench, so that it is connected to the pipe connector by a thread, and pressure is applied to the explosion-proof sealing ring between the two to ensure good sealing performance.

[0034] To further optimize the above structure, a gap is provided between the bottom of the annular groove and the upper end face of the buckle 12; the height of the inner boss at the lower end of the annular groove 15 of the movable end connector 11 is less than the height of the annular groove 14 on the buckle 12, which facilitates the movable end connector to move up and down relative to the buckle in the height direction after assembly, and at the same time, the movable end connector can rotate circumferentially relative to the buckle, which further improves the flexibility of the explosion-proof conduit after installation and facilitates flexible wiring of the explosion-proof conduit.

[0035] During assembly, the upper part of the pipe connector 10 is pressed and fixed to the end of the explosion-proof conduit 3 by a hydraulic press, and the lower part of the movable end connector 11 is pressed and fixed together with the buckle 12 by a hydraulic press. Using a hydraulic press for pressing and fixing allows for the protection of each component through the flexible pressure of hydraulic pressure.

[0036] As a preferred structure, the included angle between the central axes of the fixed interface and the movable interface is 90 degrees. Of course, the bend is not limited to 90 degrees and can be designed at other angles according to actual needs.

[0037] In summary, this utility model has the advantages of simple and compact structure and convenient and quick assembly. The fixed interface end of the bend body can be fixed to the equipment housing through the cooperation of the fixing bolt and the movable nut. Then, through the threaded engagement of the pipe fitting and the movable end fitting, and the snap-fit ​​engagement of the movable end fitting and the clip, the explosion-proof conduit can be connected to the movable interface end of the bend body. Simultaneously, the mating surfaces at both ends of the bend are sealed by an explosion-proof sealing ring, further improving the sealing performance of the conduit connection. Using this utility model can meet the explosion-proof requirements of pipeline installation and ensure the safety of the line in hazardous environments.

[0038] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An elbow for use in explosion-proof conduits, characterized in that: The device includes a bent pipe body and fixed and movable interfaces at both ends. The fixed interface is connected to the housing of the electrical equipment through a first connecting structure, and the movable interface is connected to the explosion-proof conduit through a second connecting structure. Explosion-proof sealing rings are provided between the first connecting structure and the housing, and between the second connecting structure and the explosion-proof conduit. The first connection structure includes a fixed bolt and a movable nut. The fixed bolt is fixed to the end of the fixed interface. The fixed bolt passes through the housing and the nut of the fixed bolt is located on the outside of the housing. The movable nut is threaded with the fixed bolt and is located on the inside of the housing. The explosion-proof sealing ring is fitted onto the fixed bolt and is located between the movable nut and the housing. The movable nut is used to fix the fixed interface to the housing. The second connection structure includes a pipe connector, a movable end connector, and a snap fastener. The upper part of the pipe connector is fixedly fitted onto the end of the explosion-proof conduit, and the lower part of the pipe connector is provided with an external thread that mates with the movable end connector. The upper end of the movable end connector is provided with an internal thread that mates with the pipe connector, and the lower part of the movable end connector is snapped together with the snap fastener, which is fixedly connected to the movable interface. An explosion-proof sealing ring is provided between the pipe connector and the movable end connector.

2. The elbow for use in explosion-proof conduits according to claim 1, characterized in that: The fixing bolts are welded and fixed to the end of the fixing interface.

3. The elbow for use in explosion-proof conduits according to claim 2, characterized in that: The outer circle of the nut of the fixing bolt has multiple planes evenly distributed, and the outer edge of the movable nut is raised towards the inside of the shell and has multiple protrusions evenly distributed.

4. The elbow for use in explosion-proof conduits according to claim 1, characterized in that: The buckle is a tube with an annular groove in the middle of its outer circle, and the lower inner wall of the movable end connector has an annular groove that mates with the upper part of the buckle.

5. The elbow for use in explosion-proof conduits according to claim 4, characterized in that: A gap is provided between the bottom of the annular groove and the upper end face of the buckle; the height of the inner boss at the lower end of the annular groove of the movable end connector is less than the height of the annular groove on the buckle.

6. The elbow for use in explosion-proof conduits according to claim 1, characterized in that: The buckle is welded and fixed to the end of the movable interface.

7. The elbow for use in explosion-proof conduits according to claim 6, characterized in that: The upper part of the pipe joint is pressed and fixed to the end of the explosion-proof conduit by a hydraulic press, and the lower part of the movable end joint is pressed and fixed together with the buckle by a hydraulic press.

8. An elbow for use in explosion-proof conduits according to any one of claims 1-7, characterized in that: The included angle between the central axes of the fixed interface and the movable interface is 90 degrees.

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