High-waterproofness industrial plug

Abstract

The invention relates to the technical field of industrial plugs, and discloses a high-waterproofness industrial plug. The connector comprises a housing, the front end of the housing is provided with a waterproof insertion cylinder, and the housing is also internally provided with an insertion core and a wiring terminal which are connected with the waterproof insertion cylinder; the waterproof insertion cylinder comprises an inner cylinder in threaded connection with the shell, an outer cylinder capable of being telescopically reset is arranged on the inner cylinder, and the inner cylinder and the outer cylinder are sleeved with the same rubber corrugated sleeve, so that the rubber corrugated sleeve is extruded when the waterproof insertion cylinder is inserted into the socket jack to abut against and contract. According to the invention, the plug cylinder at the front end of the plug has the telescopic characteristic and is matched with the rubber corrugated sleeve with the diameter capable of being expanded through compression, so that the plug is contracted after being inserted into the socket jack and extrudes the rubber corrugated sleeve, and the rubber corrugated sleeve abuts against the inner wall of the socket jack in an expansion manner; therefore, the stability of the plug and the waterproofness between the plug and the socket are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of industrial plugs, in particular to a highly waterproof industrial plug. Background Art

[0002] Industrial plugs are power plugs specially designed for use in industrial environments. They usually have a higher current carrying capacity and protection level. Industrial plugs usually consist of two major parts: a shell and a plug core. The shell part is composed of components such as a bolt cover, a waterproof wire clamp, and a rubber ring.

[0003] The existing industrial plug has good waterproof performance. The front end (insertion end) of the shell is provided with an insert sleeve that can surround the plug pin. When the plug is inserted into the industrial socket, the insert sleeve will also be inserted into the industrial socket. When the plug is wrapped with each other, the industrial plug has good waterproof performance. However, the gap between the insert sleeve and the socket port due to the difference in diameter causes a stability defect between the two. The waterproof ability between the two is entirely guaranteed by the rubber ring set at the step of the industrial plug (when the plug is inserted into the socket, the rubber ring will be tightly pressed against the end face or end of the socket port). Once the industrial plug is affected by external force or other reasons, resulting in the plug and the socket not being completely pressed together and a gap between the rubber ring and the socket or the plug, water seepage is likely to occur. Therefore, it is necessary to propose a highly waterproof industrial plug. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a highly waterproof industrial plug.

[0005] The present invention is implemented by the following technical scheme: a housing, a waterproof plug-in sleeve is arranged at the front end of the housing, and a plug-in core and a wiring terminal connected to the waterproof plug-in sleeve are also arranged inside the housing; The waterproof insert comprises an inner tube threadedly connected to the outer shell, the inner tube is provided with a retractable and resettable outer tube, and the inner tube and the outer tube are sleeved with the same rubber bellows sleeve, so that when the waterproof insert is inserted into the socket and pressed tightly and contracted, the rubber bellows sleeve is squeezed, and after the rubber bellows sleeve contracts and expands, it is pressed tightly against the inner wall of the socket.

[0006] As a further improvement of the above scheme, both the inner tube and the outer tube are provided with an annular groove for limiting the rubber bellows sleeve, and both ends of the rubber bellows sleeve are provided with rubber hoops, which are respectively embedded in the two annular grooves. The rubber hoops cooperate with the annular grooves to ensure the sealing between the rubber bellows sleeve and the inner tube and the outer tube.

[0007] As a further improvement of the above solution, a convex ring is provided at the bottom end of the outer tube for tightening the rubber hoop at the bottom end of the rubber corrugated sleeve, thereby ensuring the sealing of the bottom end of the rubber corrugated sleeve.

[0008] As a further improvement of the above solution, a reverse thrust mechanism is also provided inside the inner cylinder. The reverse thrust mechanism includes a plurality of positioning columns that are slidably arranged inside the inner cylinder and fixedly connected to the bottom end of the outer cylinder. A first spring for reverse thrusting the positioning columns is slidably sleeved on each of the plurality of positioning columns, so as to realize the telescopic reset of the outer cylinder.

[0009] As a further improvement of the above solution, hoop grooves are provided on each of the plurality of positioning columns. A plurality of beads adapted to the hoop grooves are slidably arranged inside the outer shell. A retaining ring for pushing against the beads and a second spring for providing a reverse thrust to the retaining ring are slidably sleeved on the core. When the outer cylinder contracts, the hoop grooves on the positioning columns are driven to align with the beads, so that the beads are snapped into the hoop grooves to limit the retaining ring, thereby offsetting the thrust applied to the outer cylinder by the first spring.

[0010] As a further improvement of the above solution, the terminal is fixedly connected to the waterproof socket cylinder. The core is slidably installed on the terminal and telescopically connected to the waterproof socket cylinder. The telescopic characteristic of the core enables the pulling force of the socket to drive the retaining ring to reset when the core is pulled out from the socket, allowing the beads to smoothly exit from the hoop grooves, ensuring that the rubber corrugated sleeve rebounds and resets with the outer cylinder, and releasing the sealed pressing between the waterproof socket cylinder and the socket jack.

[0011] As a further improvement of the above solution, a plurality of annularly distributed limiting grooves are provided on the core. Limiting blocks extending into the limiting grooves are provided on the inner wall of the retaining ring, so as to limit the sliding range of the retaining ring on the core, enabling the core to drive the retaining ring to rise and reset when pulled out from the socket.

[0012] As a further improvement of the above solution, a plurality of annularly distributed protection blocks are provided on the inner cylinder. The plurality of protection blocks all penetrate the outer cylinder and are slidably connected to the outer cylinder. The outer spacing between two protection blocks in the opposite positions is greater than the diameter of the outer cylinder, so that when the waterproof socket cylinder is inserted, the outer cylinder will not contract due to friction with the inner wall of the socket jack, resulting in premature expansion of the rubber corrugated sleeve.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: By providing a telescopic and resetable outer cylinder on the socket cylinder of the industrial plug and sleeving a telescopic and expandable rubber corrugated sleeve on the inner cylinder of the outer cylinder and the socket cylinder, when the plug is inserted into the socket jack, the outer cylinder will contract after being pressed tightly and squeeze the rubber corrugated sleeve, so that the rubber corrugated sleeve expands after being squeezed and fits tightly with the inner wall of the socket jack, thereby ensuring both the waterproofness and the tightness between the plug and the socket, making it more difficult for the two to become loose due to gaps. The reverse thrust mechanism of the outer cylinder is composed of a positioning column and a first spring. A hoop groove is arranged on the positioning column, a clamping bead that can cooperate with the hoop groove is arranged on the outer shell, and a retaining ring and a second spring that can control the clamping bead are arranged on the plug core. In this way, after the outer cylinder squeezes the rubber corrugated sleeve to achieve the tight contact between the plug and the socket, the reverse thrust mechanism of the outer cylinder can be limited, so that after the plug is inserted into the socket, the first spring will not apply a reverse thrust to the plug to cause the plug to loosen; By splitting the existing ferrule structure into two parts, the ferrule and the terminal, and allowing the ferrule and the terminal to maintain a sliding connection while achieving a certain degree of expansion and contraction, the ferrule can drive the retaining ring to reset, allowing the card bead to withdraw from the hoop groove to release the tight restriction between the plug and the socket. At the same time, the conductive connection between the ferrule and the terminal is guaranteed, avoiding the connection line being directly connected to the ferrule and expanding and contracting synchronously with the ferrule, affecting the connection stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram showing the overall display of the highly waterproof industrial plug of the present invention; Figure 2 A cross-sectional view of a highly waterproof industrial plug of the present invention; Figure 3 This is a planar cross-sectional view of the highly waterproof industrial plug of the present invention; Figure 4 for Figure 3 An enlarged view of part A in the middle; Figure 5 It is a planar cross-sectional view of the waterproof insert; Figure 6 This is a disassembled display diagram of the highly waterproof industrial plug of the present invention; Figure 7 This is a disassembled display diagram of the waterproof plug-in sleeve, plug-in core and wiring terminal; Figure 8 It is a partial cross-sectional view showing the waterproof plug-in sleeve, plug-in core and wiring terminal; Figure 9 This is a disassembled display diagram of the outer tube and the inner tube in the waterproof insert tube; Figure 10 This is a disassembly diagram of the outer cylinder and the rubber bellows sleeve; Figure 11 It is a top view of the outer tube and the inner tube; Figure 12 A partial cross-sectional view of the housing; Figure 13 This is a diagram showing the separation of the ferrule and the terminal.

[0015] Description of main symbols: 1. Shell; 101. Bolt cover; 102. Waterproof wire clamp; 103. Limiting step; 2. Waterproof plug-in tube; 201. Inner tube; 2011. Protective block; 202. Outer tube; 2021. Convex ring; 203. Rubber corrugated sleeve; 2031. Rubber hoop; 204. Positioning column; 205. First spring; 206. Hoop groove; 207. Card bead; 208. Snap ring; 209. Second spring; 3. Insert core; 301. Insulating sleeve; 302. Pin; 4. Terminal; 401. Insulating cone; 402. Screw rod; 403. Terminal; 404. Guide column. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0017] Please combine Figures 1 to 13 , a highly waterproof industrial plug, comprising: a shell 1, a bolt screw cover 101 is threadedly arranged at the bottom of the shell 1, a waterproof wire clamp 102 is arranged in the bolt screw cover 101, a waterproof plug-in sleeve 2 is arranged at the front end of the shell 1, and a plug core 3 connected to the waterproof plug-in sleeve 2 and a terminal 4 are also arranged in the shell 1; The waterproof insert 2 includes an inner cylinder 201 threadedly connected to the outer shell 1, and an outer cylinder 202 that can be retracted and reset is arranged on the inner cylinder 201. A reverse thrust mechanism is also arranged in the inner cylinder 201, and the reverse thrust mechanism includes a plurality of positioning posts 204 slidably arranged in the inner cylinder 201, and a plurality of L-shaped connecting feet are arranged at the bottom end of the outer cylinder 202, and the plurality of L-shaped connecting feet are fixedly connected to the plurality of positioning posts 204 by screws, and a first spring 205 is slidably sleeved on the plurality of positioning posts 204, and a limiting step 103 is arranged on the inner wall of the outer shell 1, and the two ends of the first spring 205 are respectively against the limiting ring on the positioning post 204 and the limiting step 103, so as to realize the telescopic reset of the outer cylinder 202, and a groove is arranged on the limiting step 103, and a plurality of perforations corresponding to the positioning post 20 are arranged in the groove, and the groove cooperates with the perforations so that the limiting step 103 can be used to support the first spring 205, and at the same time will not affect the telescopic movement of the positioning post 204 and the disassembly and assembly of the outer shell 1 to the waterproof insert 2; The inner tube 201 and the outer tube 202 are sleeved with the same rubber bellows 203, so that when the waterproof insert 2 is inserted into the socket and pressed tightly, the rubber bellows 203 is squeezed, and the rubber bellows 203 presses against the inner wall of the socket after contraction and expansion. In order to improve the sealing performance of the plug, the anti-fool device originally set at the position of the outer tube 202 is removed, and a new anti-fool ring is set on the inner tube 201. At the same time, this plug is more suitable for sockets without anti-fool grooves.

[0018] Through the above technical solution, when the plug is inserted into the socket jack, after the outer cylinder 202 is tightened, it will contract and squeeze the rubber corrugated sleeve 203, so that the rubber corrugated sleeve 203 expands after being squeezed and fits tightly with the inner wall of the socket jack. In this way, both the waterproof property between the plug and the socket and the tightness between the two are ensured, making it more difficult for the two to become loose due to gaps.

[0019] Please combine Figure 6 , both the inner cylinder 201 and the outer cylinder 202 are provided with retaining ring grooves for defining the rubber corrugated sleeve 203. Rubber retaining rings 2031 are provided at both ends of the rubber corrugated sleeve 203, and the two rubber retaining rings 2031 are respectively embedded in the two retaining ring grooves. The rubber retaining ring 2031 and the retaining ring groove can ensure the sealing performance between the rubber corrugated sleeve 203, the inner cylinder 201 and the outer cylinder 202. A convex ring 2021 is provided at the bottom end of the outer cylinder 202, which can tighten the rubber retaining ring 2031 at the bottom end of the rubber corrugated sleeve 203. When the outer cylinder 202 contracts under pressure, it will tighten the rubber retaining ring 2031 at the bottom end through the convex ring 2021, so as to ensure the sealing performance at the bottom end of the rubber corrugated sleeve 203.

[0020] Please combine Figures 2 to 6 , retaining grooves 206 are provided on multiple positioning posts 204. Multiple beads 207 adapted to the retaining grooves 206 are slidably arranged in the housing 1. A retaining ring 208 for pushing against the beads 207 and a second spring 209 for providing a reaction force to the retaining ring 208 are slidably sleeved on the plug core 3. In this way, when the outer cylinder 202 contracts, the retaining grooves 206 on the positioning posts 204 are aligned with the beads 207, so that the beads 207 are snapped into the retaining grooves 206 to limit the retaining ring 208, thereby offsetting the thrust applied by the first spring 205 to the outer cylinder 202. Multiple circumferentially distributed limiting grooves are provided on the plug core 3, and limiting blocks extending into the limiting grooves are provided on the inner wall of the retaining ring 208, so as to limit the sliding range of the retaining ring 208 on the plug core 3, so that the retaining ring 208 can be driven to rise and reset when the plug core 3 is pulled out from the socket.

[0021] Through the above technical solution, after the outer cylinder 202 squeezes the rubber corrugated sleeve 203 to complete the tightening work between the plug and the socket jack, the reaction mechanism of the outer cylinder 202 can also be limited, so that after the plug is inserted into the socket, the first spring 205 will not apply a reaction force to the plug to cause the plug to become loose.

[0022] Please combine Figure 13 , the wiring terminal 4 is fixedly connected to the waterproof socket cylinder 2, and the plug core 3 is slidably installed on the wiring terminal 4 and is telescopically connected to the waterproof socket cylinder 2; The terminal 4 is composed of an insulating frustum 401, a plurality of screw rods 402 rotatably arranged on the insulating frustum 401, a terminal 403 fixedly installed on the insulating frustum 401, and a guide post 404. The guide post 404 is fixedly connected to the terminal 403. The plurality of screw rods 402 are all threadedly connected to the inner cylinder 201. The plug core 3 is composed of an insulating sleeve 301 slidably sleeved on the plurality of screw rods 402 and a plug pin 302 fixedly arranged on the insulating sleeve 301. A slot is provided at the bottom end of the plug pin 302. The guide post 404 extends into the slot and is slidably connected to the slot. The telescopic property of the plug core 3 enables the pulling force of the socket to drive the abutting ring 208 to reset when the plug core 3 is pulled out from the socket, allowing the detent ball 207 to smoothly exit from the hoop groove 206, ensuring that the rubber corrugated sleeve 203 rebounds and resets following the outer cylinder 202, and releasing the sealing and pressing between the waterproof plug cylinder 2 and the socket jack.

[0023] Please combine Figures 7 to 11 , a plurality of protective blocks 2011 distributed in a ring are arranged on the inner cylinder 201. The plurality of protective blocks 2011 all penetrate through the outer cylinder 202 and are slidably connected to the outer cylinder 202. The outer spacing between two protective blocks 2011 in an opposing position is greater than the diameter of the outer cylinder 202. In this way, when the waterproof plug cylinder 2 is inserted, the outer cylinder 202 will not contract due to friction with the inner wall of the socket jack, causing the rubber corrugated sleeve 203 to expand prematurely.

[0024] The implementation principle of a highly waterproof industrial plug in the embodiment of this application is as follows: When wiring, pass the connecting wire through the bolt screw cap 101, the waterproof wire clamp 102, and the housing 1, then connect the connecting wire to the terminal 403 on the terminal 4, and finally tighten the waterproof plug cylinder 2 with the housing 1; When in use, insert the waterproof plug cylinder 2 into the socket jack. At this time, when the plug pin 302 on the plug core 3 enters the jack on the socket, it will contract backward, and during the contraction process, it will squeeze the second spring 209. The second spring 209 then pushes the abutting ring 208 to squeeze the detent ball 207. When the plug is fully inserted, after the outer cylinder 202 on the waterproof plug cylinder 2 abuts against the end wall of the socket jack, it will contract backward and drive the rubber corrugated sleeve 203 to contract, causing the rubber corrugated sleeve 203 to expand and abut tightly against the inner wall of the socket jack, achieving sealing; Meanwhile, the outer cylinder 202 will also drive multiple positioning posts 204 to descend synchronously (while the positioning posts 204 are descending, the first spring 205 will be compressed), until the hoop grooves 206 on the positioning posts 204 and the catch beads 207 are at the same height. At this time, the catch beads 207 pushed by the abutting ring 208 will be inserted into the hoop grooves 206, and the abutting ring 208 will smoothly descend to one side of the catch beads 207 to limit the catch beads 207, so that the catch beads 207 will not exit from the hoop grooves 206, thereby limiting the reverse pushing mechanism of the outer cylinder 202, so that after the plug is inserted into the socket, the first spring 205 will not apply a reverse thrust to the plug to cause the plug to become loose; When the plug is pulled out, the plug core 3 will be reset by the pulling of the socket jack and drive the abutting ring 208 to reset. At this time, the catch beads 207 will lose the restriction of the abutting ring 208 and exit from the hoop grooves 206, so that when the plug is pulled out, after enough space is separated between the waterproof plug cylinder 2 and the end wall of the socket jack, the first spring 205 will push the outer cylinder 202 through the positioning posts 204, so that the outer cylinder 202 will lift the rubber corrugated sleeve 203, thereby releasing the tight seal between the plug and the socket jack and allowing the plug to be pulled out more smoothly.

[0025] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of protection required by the present invention.

Claims

1. A highly waterproof industrial plug, comprising a housing (1), a waterproof insert (2) being arranged at the front end of the housing (1), a plug core (3) connected to the waterproof insert (2) and a connection terminal (4) being arranged inside the housing (1), characterized in that: The waterproof insert (2) comprises an inner cylinder (201) threadedly connected to the outer shell (1), the inner cylinder (201) being provided with a telescopic and repositionable outer cylinder (202), and the inner cylinder (201) and the outer cylinder (202) being sleeved with a same rubber corrugated sleeve (203); In this way, when the waterproof insert (2) is inserted into the socket opening and pressed against and contracted, the rubber corrugated sleeve (203) is squeezed, and after the rubber corrugated sleeve (203) contracts and expands, it presses against the inner wall of the socket opening.

2. The highly waterproof industrial plug according to claim 1, characterized in that: The inner cylinder (201) and the outer cylinder (202) are both provided with an annular groove for limiting the rubber bellows sleeve (203). Both ends of the rubber bellows sleeve (203) are provided with rubber hoops (2031). The two rubber hoops (2031) are respectively embedded in the two annular grooves. The rubber hoops (2031) cooperate with the annular grooves to ensure the sealing between the rubber bellows sleeve (203) and the inner cylinder (201) and the outer cylinder (202).

3. The highly waterproof industrial plug according to claim 2, characterized in that: The bottom end of the outer cylinder (202) is provided with a convex ring (2021) capable of pressing against the rubber hoop (2031) at the bottom end of the rubber corrugated sleeve (203), thereby ensuring the sealing performance of the bottom end of the rubber corrugated sleeve (203).

4. The highly waterproof industrial plug according to claim 1, characterized in that: A reverse thrust mechanism is also provided in the inner cylinder (201), and the reverse thrust mechanism comprises a plurality of positioning posts (204) slidably provided in the inner cylinder (201) and fixedly connected to the bottom end of the outer cylinder (202), and a first spring (205) for reversely pushing the positioning posts (204) is slidably sleeved on the plurality of positioning posts (204), thereby realizing telescopic resetting of the outer cylinder (202).

5. The highly waterproof industrial plug according to claim 4, characterized in that: A plurality of positioning columns (204) are each provided with a hoop groove (206); a plurality of clamping beads (207) adapted to the hoop groove (206) are slidably provided in the housing (1); a sliding sleeve on the insert (3) is provided with a retaining ring (208) for pushing against the retaining beads (207) and a second spring (209) for providing a reverse thrust to the retaining ring (208); Thus, when the outer tube (202) contracts, the hoop groove (206) on the positioning column (204) is driven to align with the clamping bead (207), so that the clamping bead (207) is clamped into the hoop groove (206) to restrict the abutment ring (208), thereby offsetting the thrust applied to the outer tube (202) by the first spring (205).

6. The highly waterproof industrial plug according to claim 1, characterized in that: The wiring terminal (4) is fixedly connected to the waterproof plug-in sleeve (2), and the plug-in core (3) is slidably mounted on the wiring terminal (4) and is telescopically connected to the waterproof plug-in sleeve (2); The retractable property of the plug core (3) means that when it is pulled out of the socket, the pulling force of the socket will drive the retaining ring (208) to reset, allowing the card bead (207) to smoothly withdraw from the hoop groove (206), ensuring that the rubber corrugated sleeve (203) rebounds and resets along with the outer tube (202), thereby releasing the sealing between the waterproof plug tube (2) and the socket socket.

7. The highly waterproof industrial plug according to claim 6, characterized in that: The plug core (3) is provided with a plurality of limiting grooves distributed in an annular shape, and the inner wall of the retaining ring (208) is provided with limiting blocks extending into the limiting grooves, thereby limiting the sliding range of the retaining ring (208) on the plug core (3), so that the retaining ring (208) can be driven to rise and reset when the plug core (3) is pulled out of the socket.

8. The highly waterproof industrial plug according to claim 1, characterized in that: The inner cylinder (201) is provided with a plurality of protection blocks (2011) distributed in an annular shape, the plurality of protection blocks (2011) all penetrate the outer cylinder (202) and are slidably connected to the outer cylinder (202), and the outer distance between two protection blocks (2011) in opposing positions is greater than the diameter of the outer cylinder (202); As a result, when the waterproof insert (2) is inserted, the outer cylinder (202) will not shrink due to friction with the inner wall of the socket port, causing the rubber corrugated sleeve (203) to expand prematurely.

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