Cable leading-out device for connecting flexible pipes of explosion-proof motor

Abstract

The utility model relates to a cable leading-out device for connecting flexible pipes of an explosion-proof motor. The cable leading-out device comprises a leading-out main body, a leading-out pipeline is arranged on the leading-out main body and is provided with an inlet end and an outlet end; a first thread is arranged outside the leading-out pipeline, and the outside of the leading-out pipeline is connected with an explosion-proof pipe through the first thread; a limiting assembly is further arranged and comprises an anti-explosion inner pipe, a first gasket, a second gasket and a sealing ring, and the anti-explosion inner pipe, the first gasket, the second gasket and the sealing ring are each provided with a hollow hole. Partial threads are arranged in the leading-out pipeline, second threads are arranged on the outer wall of the anti-explosion inner pipe, and the anti-explosion inner pipe is arranged at the outlet end through thread fit of the second threads and the partial threads. The first gasket, the sealing ring pile and the second gasket are sequentially stacked at the inlet end, and the first gasket, the second gasket and the sealing rings can be pressed against one another; according to the utility model, the length of the explosion-proof pipe at the cable leading-out position can be shortened, and the use requirements of more small spaces can be met.

Description

Technical Field

[0001] This utility model relates to a cable lead-out device for connecting a flexible tube to an explosion-proof motor. Background Technology

[0002] Cable lead-out devices are used to introduce cables into electrical equipment without altering the equipment's explosion-proof design. These devices are particularly important in explosion-proof electrical equipment because they directly affect the equipment's explosion-proof performance and safety.

[0003] Explosion-proof conduits will be added to the cable guide section of existing cable lead-out devices to safely lead cables into electrical equipment while maintaining the explosion-proof performance of the equipment; however, existing explosion-proof conduits are quite long and difficult to use in some confined spaces, thus limiting their use. Summary of the Invention

[0004] The purpose of this invention is to provide a cable lead-out device for connecting flexible tubes of explosion-proof motors, which can shorten the length of the explosion-proof tube at the cable lead-out point and adapt to the needs of more applications in smaller spaces.

[0005] The technical solution to achieve the purpose of this utility model is as follows: This utility model has a lead-out main body; the lead-out main body is provided with a lead-out pipe that allows cables to pass through and connects the outside to the inside of the lead-out main body, the lead-out pipe having an inlet end connecting to the inside of the lead-out main body and an outlet end connecting to the outside; the outside of the lead-out pipe is provided with a first thread, and an explosion-proof pipe is connected to the outside of the lead-out pipe through the first thread; a limiting component is also provided, the limiting component including an explosion-proof inner tube, a first gasket, a second gasket, and a sealing ring, the explosion-proof inner tube, the first gasket, the second gasket, and the sealing ring are all provided with a way for cables to pass through. The outlet pipe has a hollow hole; the interior of the outlet pipe is provided with a partial thread extending from the outlet end toward the inlet end, and the outer wall of the explosion-proof inner tube is provided with a second thread that can form a threaded engagement with the partial thread. The explosion-proof inner tube is set at the outlet end of the outlet pipe through the threaded engagement of the second thread and the partial thread; the first gasket is fixedly set inside the outlet pipe near the inlet end, the sealing ring is stacked on the first gasket, and the second gasket is stacked on the sealing ring. The first gasket, the second gasket, and the sealing ring can form mutual pressure under the threaded engagement of the explosion-proof inner tube and the outlet pipe.

[0006] Furthermore, the outer wall of the sealing ring is provided with an arc-shaped groove extending along the outer contour of the sealing ring. When the first gasket, the second gasket, and the sealing ring are pressed against each other under the threaded engagement of the explosion-proof inner tube and the outlet pipe, the arc-shaped groove is embedded in the two edges of the sealing ring facing the two sides of the first gasket and the second gasket, respectively.

[0007] Furthermore, a cutter relief groove is provided between the end of the explosion-proof inner tube facing the lead-out body and the entry end of the lead-out body, and a sealing ring is set in the cutter relief groove.

[0008] Furthermore, the explosion-proof inner tube has a drive end on the end away from the lead-out body for engaging with an external tool, and a pressing end on the end facing the lead-out body for pressing against the surface of the second gasket; the pressing end and the second thread form a clearance space for avoiding the tool relief groove; the thread length of the second thread is the same as the thread length of the partial thread, and when the second thread and the partial thread fully form a thread engagement, the clearance space and the groove edge of the tool relief groove form an insertion engagement.

[0009] Furthermore, the first thread, the partial thread, and the second thread are all fine-pitch threads, with a roughness of 1.6 to 3.2.

[0010] Furthermore, the hollow holes of the first gasket, the second gasket, and the sealing ring are of the same size, while the hollow hole of the explosion-proof inner tube is larger than the hollow holes of the first gasket, the second gasket, and the sealing ring.

[0011] The present invention has the following positive effects: (1) The present invention has an outlet pipe on the outlet body, the outlet pipe has an inlet end and an outlet end; the outlet pipe is connected to an explosion-proof pipe by a first thread, and the outlet pipe is connected to an explosion-proof inner pipe by a second thread and a partial thread through a threaded engagement; at the same time, the first gasket is fixedly installed inside the outlet pipe near the inlet end, the sealing ring is stacked on the first gasket, and the second gasket is stacked on the sealing ring. The first gasket, the second gasket and the sealing ring can form mutual pressure under the threaded engagement of the explosion-proof inner pipe and the outlet pipe; since the explosion-proof inner pipe can be completely installed into the outlet pipe, internal explosion protection is provided. In addition, the outlet pipe is connected to an explosion-proof pipe, thus ensuring the explosion protection effect when the outlet pipe is the same length as the outlet pipe; since the outlet pipe is shorter, the length of the explosion-proof pipe at the cable outlet can be shortened, which can meet the needs of more small spaces.

[0012] (2) The outer wall of the sealing ring of this utility model is provided with an arc-shaped groove extending along the extension direction of the outer contour of the sealing ring. When the first gasket, the second gasket and the sealing ring are pressed against each other under the threaded engagement of the explosion-proof inner tube and the outlet pipe, the arc-shaped groove is embedded in the two sides of the sealing ring facing the first gasket and the second gasket respectively. A relief groove is provided between the end of the explosion-proof inner tube facing the outlet body and the entry end of the outlet body, and the sealing ring is placed in the relief groove. The arc-shaped groove can provide space for deformation of the edge of the sealing ring after the sealing ring is squeezed, so that the sealing ring can fit more tightly with the groove wall of the relief groove after being squeezed, thereby strengthening the sealing effect and preventing liquid from entering the outlet body.

[0013] (3) The first thread, part of the thread and the second thread of this utility model are all fine threads with a roughness of 1.6 to 3.2. The design of fine threads can increase the flame extinguishing length and limit the flame transmission speed, ensuring that when combustion occurs, the speed at which the flame enters the main body from the outlet pipe is slowed down.

[0014] (4) The hollow holes of the first gasket, the second gasket and the sealing ring of this utility model are the same size, and the hollow hole of the explosion-proof inner tube is larger than the hollow holes of the first gasket, the second gasket and the sealing ring. Due to the difference in size, the cable can be fixed to the maximum extent when it is in the hollow hole of the first gasket, the second gasket and the sealing ring. When it is in the hollow hole of the explosion-proof inner tube, the cable has room to move. Attached Figure Description

[0015] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0016] Figure 1 This is a side sectional view of the present invention;

[0017] Figure 2 for Figure 1 A magnified view of part A in the image. Detailed Implementation

[0018] See Figures 1 to 2 This utility model includes an outlet body 1; the outlet body 1 is provided with an outlet pipe 2 that allows cables to pass through and connects the outside to the inside of the outlet body 1, the outlet pipe 2 has an inlet end connecting to the inside of the outlet body 1 and an outlet end connecting to the outside; the outside of the outlet pipe 2 is provided with a first thread 21, and an explosion-proof pipe is connected to the outside of the outlet pipe 2 through the first thread 21; a limiting component 3 is also provided, the limiting component 3 includes an explosion-proof inner tube 31, a first gasket 32, a second gasket 33 and a sealing ring 34, the explosion-proof inner tube 31, the first gasket 32, the second gasket 33 and the sealing ring 34 are all provided with hollow holes a for cables to pass through; the outlet pipe The interior of pipe 2 is provided with a partial thread 22 extending from the outlet end toward the inlet end. The outer wall of the explosion-proof inner tube 31 is provided with a second thread 4 that can form a threaded engagement with the partial thread 22. The explosion-proof inner tube 31 is set at the outlet end of the outlet pipe 2 through the threaded engagement of the second thread 4 and the partial thread 22. The first gasket 32 ​​is fixedly set inside the outlet pipe 2 near the inlet end. The sealing ring 34 is stacked on the first gasket 32, and the second gasket 33 is stacked on the sealing ring 34. The first gasket 32, the second gasket 33, and the sealing ring 34 can form mutual pressure under the threaded engagement of the explosion-proof inner tube 31 and the outlet pipe 2.

[0019] The outer wall of the sealing ring 34 is provided with an arc-shaped groove 341 extending along the extension direction of the outer contour of the sealing ring 34. When the first gasket 32, the second gasket 33 and the sealing ring 34 are pressed against each other under the threaded engagement of the explosion-proof inner tube 31 and the outlet pipe 2, the edges of the sealing ring 34 facing the two sides of the first gasket 32 ​​and the second gasket 33 are embedded in the arc-shaped groove 341 or folded outward.

[0020] Due to the setting of the arc-shaped groove 341, when the sealing ring 34 is subjected to high-intensity compression, the edges of the sealing ring 34 facing the first gasket 32 ​​and the second gasket 33 respectively are embedded in the arc-shaped groove 341 or folded outward. The part of the side wall of the hollow hole a of the sealing ring 34 that is at the same level as the arc-shaped groove 341 will form a protrusion towards the center of the hollow hole a because the edges of the two sides are embedded in the arc-shaped groove 341. In this way, the protruding part can squeeze the cable located in the hollow hole a, thereby ensuring that the cable forms a more stable fixing effect in the hollow hole a after the explosion-proof inner tube 31 and the lead-out pipe 2 form a threaded fit.

[0021] An unloading groove 311 is provided between the end of the explosion-proof inner tube 31 facing the lead-out body 1 and the entry end of the lead-out body 1, and a sealing ring 34 is provided in the unloading groove 311.

[0022] The inlet end of the outlet pipe 2 is provided with a placement platform for placing the first gasket 32. When the first gasket 32 ​​is placed on the placement platform, the first gasket 32 ​​is flush with the groove of the retraction groove 311.

[0023] The explosion-proof inner tube 31 has a drive end 312 at the end away from the lead-out body 1 for engaging with an external tool, and a pressing end 313 at the end facing the lead-out body 1 for pressing against the surface of the second gasket 33. A clearance space 5 is formed between the pressing end 313 and the second thread 4 to avoid the retraction groove 311. The thread length of the second thread 4 is the same as the thread length of a portion of the thread 22. When the second thread 4 and the portion of the thread 22 are fully engaged, the clearance space 5 and the groove edge of the pusher groove 311 are engaged. When the clearance space 5 and the groove edge of the pusher groove 311 are engaged, the pressing end 313 of the explosion-proof inner tube 31 can push the first gasket 32 ​​into the pusher groove 311, further increasing the pressure on the sealing ring 34.

[0024] The drive end 312 is an explosion-proof inner tube 31 with an outer wall that is hexagonal and can be used with a hexagonal wrench.

[0025] The first thread 21, the partial thread 22, and the second thread 4 are all fine-pitch threads, with a roughness ranging from 1.6 to 3.2. Fine-pitch threads have a denser helix, resulting in a relatively larger contact area with the nut or bolt. In threaded connections, this design improves the sealing performance between the two contact surfaces, reducing gas or liquid leakage. The smaller pitch of a fine-pitch thread, i.e., the distance between two adjacent thread peaks, means that over the same length, it has more helical turns. As the flame rises along the thread, this structure increases the path length for gas flow, thereby extending the time for heat transfer and gas cooling, which helps extinguish the flame.

[0026] Fine-pitch threads can also limit flame propagation speed. Because the pitch and height of fine-pitch threads are smaller than those of coarse-pitch threads, the space between the threads—the space through which the flame can pass—is also smaller. This smaller space restricts the flow of combustible gases or vapors, thus limiting the flame propagation speed. Simultaneously, because fine-pitch threads restrict the flow of combustible gases or vapors, the rate of combustion reaction may slow down. The flame propagation speed is related to the flow speed of combustible gases; a slower flow speed will correspondingly slow down the flame propagation speed.

[0027] The hollow holes a of the first gasket 32, the second gasket 33, and the sealing ring 34 have the same size, while the hollow hole a of the explosion-proof inner tube 31 has a larger size than the hollow holes a of the first gasket 32, the second gasket 33, and the sealing ring 34; the size difference is about 1 mm.

[0028] The working principle of this utility model is as follows: The first gasket 32 ​​is placed on the placement platform, the sealing ring 34 is placed in the relief groove 311, and the second gasket 33 is placed on the surface of the sealing ring 34. Then, the cable to be led out is simultaneously passed through the hollow holes a of the first gasket 32, the second gasket 33, and the sealing ring 34. The cable passing through the hollow holes a of the first gasket 32, the second gasket 33, and the sealing ring 34 then passes through the hollow hole a of the explosion-proof inner tube 31. The cable then passes through the outer explosion-proof tube. The explosion-proof inner tube 31 is fixed to the guide pipe by the threaded engagement of the second thread 4 and a portion of the thread 22. The explosion-proof inner tube 31 is fully installed after the second thread 4 and the portion of the thread 22 are fully engaged. Tools can be used to install the explosion-proof inner tube 31. Finally, the explosion-proof tube is installed on the outside of the lead-out pipe 2 by engaging with the first thread 21, completing the installation.

[0029] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cable lead-out device for connecting a flexible conduit for an explosion-proof motor, comprising a lead-out body (1); characterized in that: The lead-out body (1) is provided with a lead-out pipe (2) that allows cables to pass through and connects the outside to the inside of the lead-out body (1). The lead-out pipe (2) has an inlet end that connects to the inside of the lead-out body (1) and an outlet end that connects to the outside. The outside of the lead-out pipe (2) is provided with a first thread (21), and an explosion-proof pipe is connected to the outside of the lead-out pipe (2) through the first thread (21). A limiting component (3) is also provided, which includes an explosion-proof inner tube (31), a first gasket (32), a second gasket (33), and a sealing ring (34). The explosion-proof inner tube (31), the first gasket (32), the second gasket (33), and the sealing ring (34) are all provided with hollow holes (a) that allow cables to pass through. The inside of the lead-out pipe (2) The inner tube (31) is provided with a partial thread (22) extending from the outlet end toward the inlet end. The outer wall of the explosion-proof inner tube (31) is provided with a second thread (4) that can form a threaded engagement with the partial thread (22). The explosion-proof inner tube (31) is provided at the outlet end of the outlet pipe (2) through the threaded engagement of the second thread (4) and the partial thread (22). The first gasket (32) is fixedly provided inside the outlet pipe (2) near the inlet end. The sealing ring (34) is stacked on the first gasket (32), and the second gasket (33) is stacked on the sealing ring (34). The first gasket (32), the second gasket (33), and the sealing ring (34) can form mutual pressure under the threaded engagement of the explosion-proof inner tube (31) and the outlet pipe (2).

2. The cable lead-out device for connecting an explosion-proof motor flexible conduit according to claim 1, characterized in that: The outer wall of the sealing ring (34) is provided with an arc-shaped groove (341) extending along the extension direction of the outer contour of the sealing ring (34). When the first gasket (32), the second gasket (33) and the sealing ring (34) are pressed against each other by the threaded engagement of the explosion-proof inner tube (31) and the outlet pipe (2), the arc-shaped groove (341) is embedded in the edge of the sealing ring (34) facing the two sides of the first gasket (32) and the second gasket (33).

3. The cable lead-out device for connecting an explosion-proof motor flexible conduit according to claim 1, characterized in that: The explosion-proof inner tube (31) has a knife-removal groove (311) between the end facing the lead-out body (1) and the entry end of the lead-out body (1). The sealing ring (34) is set in the knife-removal groove (311), and the outer wall of the sealing ring (34) is tightly fitted with the groove wall of the knife-removal groove (311).

4. The cable lead-out device for connecting an explosion-proof motor flexible conduit according to claim 3, characterized in that: The explosion-proof inner tube (31) is provided with a drive end (312) for cooperating with external tools at the end away from the lead-out body (1), and a pressing end (313) is provided at the end of the explosion-proof inner tube (31) facing the lead-out body (1) for pressing against the surface of the second gasket (33); a clearance space (5) is formed between the pressing end (313) and the second thread (4) for avoiding the tool relief groove (311); the thread length of the second thread (4) is consistent with the thread length of the partial thread (22), and when the second thread (4) and the partial thread (22) are fully threaded, the clearance space (5) and the groove edge of the tool relief groove (311) form an insertion fit.

5. The cable lead-out device for connecting a flexible conduit for an explosion-proof motor according to claim 1, characterized in that: The first thread (21), the partial thread (22), and the second thread (4) are all fine threads with a roughness of 1.6 to 3.

2.

6. The cable lead-out device for connecting an explosion-proof motor flexible conduit according to claim 1, characterized in that: The hollow holes (a) of the first gasket (32), the second gasket (33), and the sealing ring (34) have the same size, and the hollow hole (a) of the explosion-proof inner tube (31) has a larger size than the hollow holes (a) of the first gasket (32), the second gasket (33), and the sealing ring (34).

Images