Non-standard explosion-proof plug tail adaptive connecting piece and processing method and assembling method thereof

Abstract

The invention relates to a non-standard explosion-proof plug tail adaptive connecting piece and a processing method and an assembling method thereof, and belongs to the technical field of electrical connecting parts. According to the invention, firstly, a double internal thread structure is adopted, and the explosion-proof plug and the explosion-proof flexible pipe are respectively matched through different thread structures at two ends, so that the direct connection of the explosion-proof plug and the explosion-proof flexible pipe is realized, the trouble of connection after multiple switching is avoided, and the connection process of the explosion-proof plug and the explosion-proof flexible pipe is simplified; and the maintenance and installation speed can be effectively improved. And secondly, through the internal conical design, it is guaranteed that the explosion-proof plug and the connecting piece are gradually sealed in the spiral fastening process, meanwhile, the sealing plug and the sealing ring which are made of butyronitrile (NBR) rubber materials are cooperatively used in the explosion-proof plug and the connecting piece for sealing, and reliable sealing performance can be guaranteed on the premise that matched connection is met.

Description

Technical Field

[0001] This invention relates to the field of electrical connection components, and in particular to a non-standard explosion-proof plug tail adapter connector and its processing and assembly methods, which is especially suitable for connecting the power supply plug of aerospace engine equipment with strict explosion-proof requirements to an explosion-proof flexible tube. Background Technology

[0002] In engine manufacturing equipment, in highly hazardous factory environments such as chemical plants, where flammable and explosive conditions exist, explosion-proof plug-in devices (including explosion-proof plugs and sockets) are commonly used in conjunction with explosion-proof flexible conduits in electrical equipment. A reliable connection between the explosion-proof plug-in device and the explosion-proof flexible conduit is one of the basic conditions for the reliable use of explosion-proof electrical equipment.

[0003] Due to working conditions and safety requirements, the production site environment contains flammable, explosive, and corrosive substances. At the same time, most non-standard equipment is subject to complex mechanical vibrations and impacts, and its reliability is directly related to the safe operation of the equipment and the life safety of the operators.

[0004] The explosion-proof requirements for power supply plugs are extremely high, and explosion-proof plugs are widely used in such scenarios due to their excellent explosion-proof performance. However, during use, the connecting thread at the end of the explosion-proof plug is a rectangular external thread, while the commonly used national standard explosion-proof flexible conduit has a tapered external thread. Because the thread types are different, they cannot be matched when connected. Forcing a connection not only makes it difficult to guarantee the stability and sealing of the connection but also seriously affects the explosion-proof performance, failing to meet the stringent explosion-proof and safety standardization requirements for electrical connection components in aerospace engine equipment manufacturing sites, posing a significant safety hazard. Therefore, developing a transition adapter that can effectively connect explosion-proof plugs and explosion-proof flexible conduits is of significant practical importance. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art, provide a non-standard explosion-proof plug tail adapter connector and its processing and assembly methods, solve the problem of difficulty in connecting due to the different structures of the two, ensure the stability, sealing and explosion-proof performance of the connection, and meet the production working environment and safety requirements.

[0006] The solution of the present invention is: a non-standard explosion-proof plug tail adapter connector for connecting a plastic explosion-proof plug to an explosion-proof flexible tube, one end of which is provided with a rectangular internal thread for connecting the explosion-proof plug, and the other end of which is provided with a tapered internal thread for connecting the explosion-proof flexible tube.

[0007] Preferably, the specifications and dimensions of the rectangular internal thread are precisely matched with the rectangular external thread of the explosion-proof plug, and the connection length between the two is in the range of 15mm-16mm.

[0008] Preferably, the tapered internal thread is adapted to the tapered external thread of the explosion-proof hose.

[0009] Preferably, the material is made of metal that meets explosion-proof standards.

[0010] Preferably, the tail of the explosion-proof plug is tapered, and the through-hole area between the rectangular internal thread and the tapered internal thread adopts a tapered contraction design. The tail of the explosion-proof plug is equipped with a rubber sealing plug. During the process of the adapter connector being rotated clockwise relative to the tail of the explosion-proof plug for tightening, the sealing plug at the tail of the explosion-proof plug gradually contracts and locks under the squeezing action of the tapered through-hole wall of the connector until it is completely sealed.

[0011] Preferably, the tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

[0012] Preferably, the processing method for the above-mentioned non-standard explosion-proof plug tail adapter connector includes the following steps: S1. Select stainless steel material of appropriate specifications, and use precision machining equipment to first machine the stainless steel material to produce cylindrical fitting blanks. S2. Machine a rectangular internal thread to match the mating dimensions of the rectangular external thread. Machine a tapered internal thread to match the other end according to the parameter dimensions of the tapered external thread of the explosion-proof hose.

[0013] Preferably, the assembly method of the above-mentioned non-standard explosion-proof plug tail adapter connector includes the following steps: Align the end of the adapter connector with the rectangular internal thread with the rectangular external thread of the explosion-proof plug, and rotate the adapter connector to make it tightly connected to the explosion-proof plug to ensure a secure connection. Align the tapered external thread end of the explosion-proof hose with the tapered internal thread end of the adapter, and rotate slowly to ensure that the threads are not damaged during the connection process. Once rotated into place, the connection between the explosion-proof hose and the adapter is complete.

[0014] Preferably, during the process of the adapter connector being rotated clockwise relative to the tail of the explosion-proof plug to tighten, the sealing plug at the tail of the explosion-proof plug gradually contracts and locks under the squeezing action of the tapered through-hole wall of the adapter until it is completely sealed.

[0015] Preferably, the tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

[0016] The advantages of this invention compared to the prior art are: (1) The present invention adopts a double internal thread structure, which matches the explosion-proof plug and the explosion-proof flexible tube respectively through different thread structures at both ends, realizing the direct connection between the explosion-proof plug and the explosion-proof flexible tube, avoiding the trouble of multiple conversions before connection, simplifying the connection process between the explosion-proof plug and the explosion-proof flexible tube, and effectively improving the maintenance and installation speed.

[0017] (2) The present invention ensures that the explosion-proof plug and the connector are gradually sealed during the spiral tightening process through the internal conical design. At the same time, the internal sealing plug and sealing ring made of nitrile rubber are used for sealing. Under the premise of meeting the matching connection, reliable sealing can also be guaranteed. Attached Figure Description

[0018] Figure 1 This is a front view of the connector of the present invention, which is mainly shown in conjunction with the side view to illustrate the external structure of the connector; Figure 2 This is a side view of the connector of the present invention, mainly used in conjunction with the front view to illustrate the external structure of the connector; Figure 3 This is a cross-sectional view of the connector of the present invention, mainly illustrating the internal structure of the connector, the through-hole structure, and the internal tapered contraction position. Detailed Implementation

[0019] The present invention will be further described below with reference to the embodiments.

[0020] like Figures 1-3 As shown, the present invention provides a non-standard explosion-proof plug tail adapter connector for connecting a plastic explosion-proof plug to an explosion-proof flexible tube. One end of the connector is provided with a rectangular internal thread for connecting the explosion-proof plug, and the other end is provided with a tapered internal thread for connecting the explosion-proof flexible tube.

[0021] Preferably, the specifications and dimensions of the rectangular internal thread are precisely matched with the rectangular external thread of the explosion-proof plug, and the connection length between the two is in the range of 15mm-16mm.

[0022] The tapered internal thread is compatible with the tapered external thread of the explosion-proof hose.

[0023] Preferably, the material is made of metal that meets explosion-proof standards. For example, stainless steel, carbon steel, or aluminum.

[0024] Preferably, the tail of the explosion-proof plug is tapered, and the through-hole area between the rectangular internal thread and the tapered internal thread adopts a tapered contraction design. The tail of the explosion-proof plug is equipped with a rubber sealing plug. During the process of the adapter connector being rotated clockwise relative to the tail of the explosion-proof plug for tightening, the sealing plug at the tail of the explosion-proof plug gradually contracts and locks under the squeezing action of the tapered through-hole wall of the connector until it is completely sealed.

[0025] Preferably, the tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

[0026] Another technical solution of the present invention is: a processing method for a non-standard explosion-proof plug tail adapter connector, the method comprising the following steps: S1. Select stainless steel material of appropriate specifications, and use precision machining equipment to first machine the stainless steel material to produce cylindrical fitting blanks. S2. Machine a rectangular internal thread to match the mating dimensions of the rectangular external thread. Machine a tapered internal thread to match the other end according to the parameter dimensions of the tapered external thread of the explosion-proof hose.

[0027] Align the end of the adapter connector with the rectangular internal thread with the rectangular external thread of the explosion-proof plug, and rotate the adapter connector to make it tightly connected to the explosion-proof plug to ensure a secure connection. The present invention also provides an assembly method for a non-standard explosion-proof plug tail adapter connector, the steps of which are: aligning one end of the tapered external thread of the explosion-proof hose with the end of the tapered internal thread of the adapter connector, and rotating slowly to ensure that the threads are not damaged during the connection process, and rotating to the correct position to complete the connection between the explosion-proof hose and the adapter connector.

[0028] During the process of tightening the adapter by rotating it clockwise relative to the tail of the explosion-proof plug, the sealing plug at the tail of the explosion-proof plug gradually contracts and locks under the squeezing action of the tapered through-hole wall of the adapter until it is completely sealed.

[0029] The tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

[0030] Example 1 The embodiments of the present invention are designed with a series of adapter devices to ensure uniform appearance and durability, while improving the reliability of this series of non-metallic explosion-proof plug-in devices in special working conditions. Technical solution: This connector has a through-hole double internal thread structure. One end is set with a rectangular internal thread, the specifications and dimensions of which are precisely matched with the rectangular external thread of the explosion-proof plug, so as to achieve a tight and stable threaded connection. The other end is set with a tapered internal thread, which is compatible with the tapered external thread of the explosion-proof hose, so as to ensure a reliable connection with the explosion-proof hose. Beneficial effects: Successfully solved the problem of the inability to connect the Feice brand angled explosion-proof plug and explosion-proof hose conveniently and reliably due to the different mating thread structure, enabling the two to be connected smoothly and improving the installation efficiency and reliability of the electrical connection system; Because the threads at both ends of the adapter connector fit tightly with the corresponding plug and hose threads, the stability and sealing of the connection are greatly enhanced, effectively preventing the intrusion of external explosive gases, dust, etc., ensuring the explosion-proof performance of the second floor, meeting the strict explosion-proof requirements of electrical connection components in high-risk places such as the production of aerospace engine equipment, and reducing safety risks.

[0031] Made of metal materials that meet explosion-proof standards, it has good durability and corrosion resistance, reducing the frequency of maintenance and replacement, lowering the cost of use, and extending the service life of the entire electrical connection system.

[0032] This invention mainly targets the oblique-type explosion-proof plug-in device in the explosion-proof plug-in device of the Feice brand.

[0033] Feice brand explosion-proof plug-in devices are divided into the "AC" series explosion-proof pins and the "BCZ8060-" series corrosion-resistant and explosion-proof pins. The table below shows the specifications of all angled plug-in explosion-proof plug-in devices in these two series:

[0034] The table below shows the specifications of three commonly used explosion-proof flexible conduits:

[0035] The adapter connector features a tapered seal design in the middle of its internal threads at both ends. This internal tapered structure effectively constricts and secures the explosion-proof plug, ensuring a tight seal.

[0036] Based on the commonly used explosion-proof plug-in devices and explosion-proof flexible pipe thread dimensions in the table above, four specifications of adapter connectors were initially manufactured and named in the order of 1#-4#. Assuming the connector's connection end with the explosion-proof plug is the front end and the connection end with the explosion-proof flexible pipe is the rear end, the results are shown in the table below:

[0037] Processing Technology: Based on design requirements, select appropriate stainless steel materials and use precision machining equipment, such as CNC lathes, to first machine the material to create a cylindrical fitting blank. Then, machine a matching rectangular internal thread according to the dimensions of the rectangular external thread in the model's technical parameters. On the other end, machine a matching tapered internal thread based on the dimensions of the tapered external thread of the explosion-proof hose. During processing, strictly control the thread accuracy according to national standard thread tolerances; exceeding tolerances is not permitted.

[0038] Installation Procedure: Align the end of the adapter with the rectangular internal thread with the rectangular external thread of the explosion-proof plug. Slowly rotate the adapter connector to ensure a tight connection with the explosion-proof plug, guaranteeing a secure connection without any looseness. Align the end of the explosion-proof hose with the tapered external thread of the adapter connector, and similarly rotate slowly, ensuring no damage to the threads during the connection process. Once fully rotated, the explosion-proof hose and adapter connector are connected, ensuring a tight and stable connection.

[0039] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A non-standard explosion-proof plug tail adapter connector for connecting a plastic explosion-proof plug to an explosion-proof flexible tube, characterized in that... One end of the connector is provided with a rectangular internal thread for connecting an explosion-proof plug, and the other end is provided with a tapered internal thread for connecting an explosion-proof hose.

2. The non-standard explosion-proof plug tail adapter connector according to claim 1, characterized in that, The specifications and dimensions of the rectangular internal thread are precisely matched with the rectangular external thread of the explosion-proof plug, and the connection length between the two is in the range of 15mm-16mm.

3. The non-standard explosion-proof plug tail adapter connector according to claim 1, characterized in that, The tapered internal thread is compatible with the tapered external thread of the explosion-proof hose.

4. The non-standard explosion-proof plug tail adapter connector according to claim 1, characterized in that, It is made of metal materials that meet explosion-proof standards.

5. A non-standard explosion-proof plug tail adapter connector according to claim 1, characterized in that, The explosion-proof plug has a tapered tail. The through-hole area between the rectangular internal thread and the tapered internal thread adopts a tapered contraction design. The explosion-proof plug is equipped with a rubber sealing plug. During the process of the adapter connector being rotated clockwise relative to the explosion-proof plug tail to tighten, the sealing plug at the explosion-proof plug tail gradually contracts and locks under the squeezing action of the tapered through-hole wall of the adapter until it is completely sealed.

6. A non-standard explosion-proof plug tail adapter connector according to claim 1, characterized in that, The tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

7. The processing method of the non-standard explosion-proof plug tail adapter connector as described in claim 1, characterized in that, Includes the following steps: S1. Select stainless steel material of appropriate specifications, and use precision machining equipment to first machine the stainless steel material to produce cylindrical fitting blanks. S2. Machine a rectangular internal thread to match the mating dimensions of the rectangular external thread. Machine a tapered internal thread to match the other end according to the parameter dimensions of the tapered external thread of the explosion-proof hose.

8. The assembly method of the non-standard explosion-proof plug tail adapter connector as described in claim 1, characterized in that... Includes the following steps: Align the end of the adapter connector with the rectangular internal thread with the rectangular external thread of the explosion-proof plug, and rotate the adapter connector to make it tightly connected to the explosion-proof plug to ensure a secure connection. Align the tapered external thread end of the explosion-proof hose with the tapered internal thread end of the adapter, and rotate slowly to ensure that the threads are not damaged during the connection process. Once rotated into place, the connection between the explosion-proof hose and the adapter is complete.

9. The assembly method of a non-standard explosion-proof plug tail adapter connector as described in claim 8, characterized in that, During the process of tightening the adapter by rotating it clockwise relative to the tail of the explosion-proof plug, the sealing plug at the tail of the explosion-proof plug gradually contracts and locks under the squeezing action of the tapered through-hole wall of the adapter until it is completely sealed.

10. The assembly method of a non-standard explosion-proof plug tail adapter connector as described in claim 8, characterized in that, The tapered internal thread is equipped with a sealing ring made of nitrile rubber. After the tapered internal thread is connected and tightened with the explosion-proof hose, the sealing ring is squeezed by the end face to complete the seal.

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