An underwater plug-in connector

Abstract

The present invention relates to the technical field of plug-in electrical connectors, and in particular to an underwater plug-in connector, comprising a plug and a socket, wherein the socket is provided with a plurality of pin assemblies, the plug is provided with a plurality of insert sleeves, the pin assemblies are plugged in and matched with the insert sleeves, the pin assembly comprises a pin body and a guide rod, the pin body is fixedly arranged on a socket shell, the guide rod can slide along the insert body, a conductive spring is connected between the end face of the pin body and the end of the guide rod, and a conductive ring is fixedly arranged on the inner wall of the insert sleeve; a rubber protective sleeve is provided on the outer sleeve of the pin assembly, an opening is provided at one end of the rubber protective sleeve away from the pin body, a limiting ring is provided at the opening, and an elastic shrinkage opening is also provided at the position of the opening, the elastic shrinkage opening closes the opening of the rubber protective sleeve; when the pin assembly is plugged in and matched with the insert sleeve, the conductive spring radially expands and then plugs in and matches with the conductive ring to achieve conductive connection between the plug and the socket.

Description

Technical Field

[0001] The invention relates to the technical field of pluggable electrical connectors, and in particular to an underwater pluggable connector. Background Art

[0002] Underwater pluggable connectors are connectors that can be plugged in and out underwater, and are mainly used for power transmission and signal transmission in underwater environments. Underwater pluggable connectors are characterized by fast and convenient plugging and unplugging underwater, and can work stably underwater for a long time, so they are widely used in marine engineering, underwater archaeology, underwater exploration and other fields.

[0003] However, in the existing underwater plug-in connector, the pins of the socket are exposed in the water, so when the socket and the plug are plugged in, some impurities and water will still enter the inside of the plug along with the pins, thereby affecting the conductive effect of the underwater plug-in connector. Summary of the invention

[0004] Based on this, it is necessary to provide an underwater plug-in connector to address the technical problem that the current underwater plug-in connector has poor conductor effect.

[0005] The above purpose is achieved through the following technical solutions:

[0006] An underwater plug-in connector comprises a plug and a socket, wherein the socket comprises a socket shell, wherein a plurality of pin assemblies are arranged inside the socket shell, wherein the plug comprises a plug shell, wherein an inner cylinder is arranged inside the plug shell, wherein a plurality of insert cylinders are arranged inside the inner cylinder, wherein the socket shell can be inserted between the plug shell and the inner cylinder, wherein the pin assemblies correspond to the insert cylinders one by one and are plugged in and matched, wherein the pin assemblies comprise a pin body and a guide rod, wherein the pin body is fixedly arranged on the socket shell, wherein the guide rod can slide along the pin body, wherein a conductive spring is connected between the end face of the pin body and the end of the guide rod, wherein the conductive spring is spirally shaped; wherein the insert cylinder A conductive ring is fixedly provided on the inner wall; a rubber protective sleeve is provided on the outer sleeve of the pin assembly, an opening is provided on the end of the rubber protective sleeve away from the pin body, a limiting ring is provided on the opening, the limiting ring props the opening open, an elastic shrink opening is also provided at the position of the opening, the elastic shrink opening closes the opening of the rubber protective sleeve; when the pin assembly is plugged into the plug sleeve, the limiting ring cooperates with the end face of the plug sleeve to expand the elastic shrink opening, so that the guide rod and the conductive spring can be inserted into the interior of the conductive ring; then the guide rod slides along the pin body, so that the conductive spring radially expands and contacts with the conductive ring, thereby realizing the conductive connection between the plug and the socket.

[0007] Furthermore, a sliding groove is provided on the pin body, the guide rod is slidably set in the sliding groove, and a first clamping structure is provided between the guide rod and the sliding groove, and the first clamping structure makes the guide rod in the longest extended state; the first clamping structure includes an annular groove located on the outer peripheral surface of the guide rod and a convex ring located on the inner wall of the sliding groove, and the annular groove and the convex ring are blocked and matched in the plug-in direction.

[0008] Furthermore, a sliding column is provided inside the conductive ring, the end of the guide rod is a truncated cone, a second clamping structure is provided between the truncated cone and the end surface of the sliding column, and the second clamping structure clamps the truncated cone and the sliding column.

[0009] Furthermore, an annular boss is provided on the circular table, and an annular groove is provided on the end surface of the sliding column. The annular boss and the annular groove are blocked and matched in the plug-in direction, and the annular boss and the annular groove constitute the second clamping structure.

[0010] Furthermore, a guide cylinder is provided at the center of the insert cylinder, and an insert rod is fixed on the sliding column. The insert rod can slide along the guide cylinder, and a return spring is provided on the outer sleeve of the insert rod and the guide cylinder. The two ends of the return spring are respectively cooperated with the end surface stops of the sliding column and the insert cylinder. When the sliding column slides along the inside of the insert cylinder, the return spring can be compressed.

[0011] Furthermore, a third clamping structure is provided between the sliding column and the insert cylinder, and the third clamping structure includes a push rod, a telescopic rod and a limit groove. The push rod is slidably arranged on the sliding column, and the sliding direction of the push rod is parallel to the axis of the sliding column. The push rod has a first end and a second end. The first end of the push rod extends into the annular groove, and the annular boss is inserted into the annular groove and can push the push rod to slide. The telescopic rod is set to slide radially along the sliding column, and the limit groove is set on the inner wall of the insert cylinder; the sliding of the push rod enables its second end to push the telescopic rod to slide radially along the sliding column and insert into the limit groove.

[0012] Furthermore, the second end of the push rod extends radially along the sliding column, the second end of the push rod has a second inclined surface, the end of the telescopic rod close to the push rod is provided with a third inclined surface, the telescopic rod is arranged on the side wall of the sliding column through a connecting spring, and the connecting spring makes the third inclined surface contact with the second inclined surface.

[0013] Furthermore, two balanced pressure membranes are provided between the inner tube and the multiple inserted tubes, and the two balanced pressure membranes are distributed along the axial direction of the inserted tubes. A sealing plate is provided at one end of the inner tube facing the socket, and a sealed cavity is formed between the sealing plate and the balanced pressure membrane. The sealed cavity is used to seal the outside of the multiple inserted tubes.

[0014] Furthermore, the inner tube is provided with a first communication port, which is used to guide the water between the plug shell and the inner tube to between the inner tube and the balanced pressure membrane, and the plug shell is provided with a second communication port, which is used to discharge the water between the plug shell and the inner tube to the outside of the plug.

[0015] Furthermore, the insert tube has an insert end extending from the sealed cavity, and the insert end is provided with a third communication port, and the third communication port is used to discharge water inside the insert tube to the outside of the plug.

[0016] The beneficial effects of the present invention are:

[0017] The underwater plug-in connector provided by the present invention is provided with a rubber protective cover that can protect the pin assembly. Before the pin assembly is plugged into the plug barrel, the rubber protective cover seals the pin assembly. When the pin assembly is plugged into the plug barrel, the rubber protective cover is automatically expanded, and the conductive spring is exposed and enters the interior of the plug barrel. This can better protect the pin assembly from erosion by seawater and improve the conductive effect of the pin assembly.

[0018] Secondly, compared with the pin structure in the prior art, the present invention realizes conductive connection by radially expanding the conductive spring to contact the conductive ring, so that the conductivity of the connector is more stable, thereby improving the conductive effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of an underwater pluggable connector provided in one embodiment of the present invention;

[0020] Figure 2 A side view of an underwater pluggable connector provided by an embodiment of the present invention;

[0021] Figure 3 for Figure 2 Middle XX section view;

[0022] Figure 4 for Figure 3 A magnified view of the structure at center;

[0023] Figure 5 for Figure 3 A magnified view of the structure at B in the middle;

[0024] Figure 6 for Figure 3 A magnified view of the structure at C in the middle;

[0025] Figure 7 for Figure 3 Another state diagram of ;

[0026] Figure 8 for Figure 7 A magnified view of the structure at D in the middle;

[0027] Fig. 9 for Figure 7 Enlarged view of the structure at E in the middle;

[0028] Fig.10 for Figure 7 Enlarged view of the structure at F in the middle.

[0029] in:

[0030] 110, socket; 111, socket shell; 112, socket drain port; 120, plug; 121, plug shell; 122, second communication port; 123, inner cylinder; 124, first communication port; 125, pressure balance membrane; 126, sealing plate; 127, insert cylinder; 1272, front end groove; 1273, rear end groove; 1274, third communication port; 128, guide cylinder; 129, reset spring; 130, pin assembly; 131, pin body; 132, convex ring; 1 33. Slide groove; 134. Annular groove; 135. Guide rod; 136. Conductive spring; 137. Annular boss; 138. Conical surface; 140. Rubber protective sleeve; 142. Elastic shrinkage mouth; 143. Limiting ring; 150. Push rod; 151. Second inclined surface; 152. First inclined surface; 161. Insert rod; 162. Conductive ring; 164. Telescopic rod; 165. Sliding column; 1651. Mounting groove; 1652. Annular groove; 166. Connecting spring; 167. Limiting groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] like Figures 1 to 10 As shown, an underwater plug-in connector provided by an embodiment of the present invention includes a plug 120 and a socket 110, wherein the socket 110 includes a socket shell 111, wherein a plurality of pin assemblies 130 are arranged inside the socket shell 111, wherein the plug 120 includes a plug shell 121, wherein an inner cylinder 123 is arranged inside the plug shell 121, wherein a plurality of insert cylinders 127 are arranged inside the inner cylinder 123, wherein the socket shell 111 can be inserted between the plug shell 121 and the inner cylinder 123, wherein the pin assemblies 130 correspond to the insert cylinders 127 one by one and are plugged in and matched, wherein the pin assembly 130 includes a pin body 131 and a guide rod 135, wherein the pin body 131 is fixedly arranged on the socket shell 111, wherein the guide rod 135 can slide along the pin body 131, wherein a conductive spring 136 is connected between the end surface of the pin body 131 and the end of the guide rod 135, wherein the ... 6 is spiral; a conductive ring 162 is fixedly arranged on the inner wall of the insert cylinder 127; a rubber protective sleeve 140 is sleeved on the outer side of the pin assembly 130, and an opening is arranged at one end of the rubber protective sleeve 140 away from the pin body 131, and a limiting ring 143 is arranged on the opening, and the limiting ring 143 props the opening open, and an elastic shrink opening 142 is also arranged at the position of the opening, and the elastic shrink opening 142 closes the opening of the rubber protective sleeve 140; when the pin assembly 130 is plugged into the insert cylinder 127, the limiting ring 143 cooperates with the end face of the insert cylinder 127 to make the end of the guide rod 135 expand the elastic shrink opening 142, and then the guide rod 135 and the conductive spring 136 can be inserted into the conductive ring 162; then the guide rod 135 slides along the pin body 131, so that the conductive spring 136 radially expands and then contacts with the conductive ring 162, so as to realize the conductive connection between the plug 120 and the socket 110.

[0035] By providing a rubber protective cover 140 that can protect the pin assembly 130, before the pin assembly 130 is plugged into the plug tube 127, the rubber protective cover 140 closes the pin assembly 130. When the pin assembly 130 is plugged into the plug tube 127, the rubber protective cover 140 is automatically expanded, and the conductive spring 136 is exposed and enters the inside of the plug tube 127. This can better protect the pin assembly 130 from erosion by seawater and improve the conductive effect of the pin assembly 130.

[0036] Secondly, compared with the pin structure in the prior art, the present invention realizes conductive connection by radially expanding the conductive spring 136 to contact the conductive ring 162, so that the conductivity of the connector is more stable, thereby improving the conductive effect.

[0037] The inner circumference of the rubber protective sleeve 140 is a friction surface, and the outer circumference is a smooth surface, so that the rubber protective sleeve 140 is easy to overlap.

[0038] In one embodiment, the pin body 131 is provided with a slide groove 133, the guide rod 135 is slidably disposed in the slide groove 133, a first clamping structure is provided between the guide rod 135 and the slide groove 133, the first clamping structure makes the guide rod 135 in the longest extended state; the first clamping structure includes an annular groove 134 located on the outer peripheral surface of the guide rod 135 and a convex ring 132 located on the inner wall of the slide groove 133, the annular groove 134 and the convex ring 132 are blocked in the plugging direction. The annular groove 134 and the convex ring 132 are both set to smooth surfaces, so as to facilitate the clamping fit. The first clamping structure is similar to the clamping between the pen holder and the pen cap. The outer surface of the convex ring 132 includes a smooth first slope and a second slope. The first slope is arranged away from the plug 120, and the second slope is arranged close to the plug 120. The slope of the second slope is steeper than that of the first slope. Thus, the first slope makes it easy for the convex ring 132 to be clamped with the annular groove 134, and the second slope makes it difficult for the convex ring 132 to be separated from the annular groove 134 after being clamped. When the guide rod 135 is clamped with the slide groove 133 through the first clamping structure, the guide rod 135 is in the longest extended state, and the conductive spring 136 is in the stretched state, so that the diameter of the conductive spring 136 is the smallest.

[0039] In one embodiment, a slide post 165 is provided inside the conductive ring 162 , the end of the guide rod 135 is a frustum, and a second clamping structure is provided between the frustum and the end surface of the slide post 165 , and the second clamping structure clamps the frustum and the slide post 165 .

[0040] In one embodiment, an annular boss 137 is provided on the circular table, and an annular groove 1652 is provided on the end surface of the sliding column 165. The annular boss 137 and the annular groove 1652 are engaged with each other in the insertion direction, and the annular boss 137 and the annular groove 1652 constitute the second clamping structure.

[0041] In one embodiment, a guide cylinder 128 is provided at the center of the insert cylinder 127, and an insert rod 161 is fixed on the sliding column 165. The insert rod 161 can slide along the guide cylinder 128, and a return spring 129 is provided on the outside of the insert rod 161 and the guide cylinder 128. The two ends of the return spring 129 are respectively cooperated with the end surface stops of the sliding column 165 and the insert cylinder 127. When the sliding column 165 slides along the inside of the insert cylinder 127, the return spring 129 can be compressed.

[0042] In one embodiment, a third clamping structure is provided between the sliding column 165 and the inserting tube 127, and the third clamping structure includes a push rod 150, a telescopic rod 164 and a limiting groove 167. The push rod 150 is slidably arranged on the side wall of the sliding column 165, and the sliding direction of the push rod 150 is parallel to the axis of the sliding column 165. The push rod 150 has a first end and a second end. The first end of the push rod 150 extends into the annular groove 1652. The annular boss 137 can push the push rod 150 to slide while inserting into the annular groove 1652. The telescopic rod 164 is slidably arranged along the radial direction of the sliding column 165, and the limiting groove 167 is arranged on the inner wall of the inserting tube 127. The sliding of the push rod 150 enables the second end of the push rod 150 to push the telescopic rod 164 to slide along the radial direction of the sliding column 165 and insert into the limiting groove 167. The annular boss 137 can be deformed radially so as to be clamped into the annular groove 1652. The first end of the push rod 150 is provided with a first inclined surface 152, and the annular boss 137 is provided with a conical surface 138, and the conical surface 138 cooperates with the first inclined surface 152 to push the push rod 150 to slide. In other embodiments, the conical surface 138 and the first inclined surface 152 may not be provided, and the annular end surface of the annular boss 137 directly slides in the annular groove 1652 to push the push rod 150 to slide.

[0043] In one embodiment, the second end of the push rod 150 extends along the radial direction of the sliding column 165, and the second end of the push rod 150 has a second inclined surface 151. The end of the telescopic rod 164 close to the push rod 150 is provided with a third inclined surface. The telescopic rod 164 is arranged on the sliding column 165 through a connecting spring 166, and the connecting spring 166 makes the third inclined surface contact with the second inclined surface 151. A mounting groove 1651 is provided in the sliding column 165, and the second inclined surface 151, the third inclined surface and the connecting spring 166 are all located in the mounting groove 1651.

[0044] In one embodiment, two balanced pressure membranes 125 are provided between the inner tube 123 and the multiple inserted tubes 127, and the two balanced pressure membranes 125 are distributed along the axial direction of the inserted tubes 127. A sealing plate 126 is provided at one end of the inner tube 123 facing the socket, and a sealed cavity is formed between the sealing plate 126 and the balanced pressure membrane 125, and the sealed cavity is used to seal the outside of the multiple inserted tubes 127.

[0045] In one embodiment, the inner cylinder 123 is provided with a first communication port 124, which is used to guide the water between the plug housing 121 and the inner cylinder 123 to between the inner cylinder 123 and the balanced pressure membrane 125, and the plug housing 121 is provided with a second communication port 122, which is used to discharge the water between the plug housing 121 and the inner cylinder 123 to the outside. The socket housing 111 is provided with a socket drain port 112, which is used to discharge the water inside the socket housing 111 to the outside of the plug 120. By guiding the water between the plug housing 121 and the inner cylinder 123 to between the inner cylinder 123 and the balanced pressure membrane 125, the balanced pressure membrane 125 can be squeezed, so that the pressure in the sealed cavity is increased, so that the plug 120 can withstand a greater external seawater pressure. The balanced pressure membrane 125 belongs to the prior art.

[0046] In one embodiment, the insert 127 has a plug-in end extending from the sealed cavity, and a third communication port 1274 is provided on the plug-in end. The third communication port 1274 is used to discharge water inside the insert 127 to the outside of the plug 120. A one-way valve (not shown in the figure) is provided inside the third communication port 1274, and the one-way valve prevents external seawater from entering the insert 127.

[0047] The insert 127 is provided with a front groove 1272 and a rear groove 1273 inside, the rear groove 1273 is located inside the sealing cavity, the conductive ring 162 is located in the rear groove 1273, the front groove 1272 is located inside the plug end, and a separation ring is fixed inside the insert 127, the separation ring separates the front groove 1272 from the rear groove 1273, and the separation ring is in sliding contact with the sliding column 165. The front groove 1272 allows part of the rubber protective sleeve 140 to enter, and blocks the rubber protective sleeve 140 axially.

[0048] In combination with the above embodiments, the use principle and working process of the embodiments of the present invention are as follows:

[0049] Before the plug 120 is connected to the socket 110, the guide rod 135 is connected to the pin body 131 through the first connection structure, and the conductive spring 136 is in a stretched state, so that the diameter of the conductive spring 136 is the smallest. The slide post 165 is located at one end of the plug tube 127 close to the socket 110, and the return spring 129 is in the longest state.

[0050] Then, the plug 120 is docked with the socket 110, and the socket shell 111 is inserted between the plug shell 121 and the inner cylinder 123, so that the water inside the socket shell 111 is discharged through the socket drain port 112, and part of the water between the plug shell 121 and the inner cylinder 123 flows to between the inner cylinder 123 and the balanced pressure membrane 125 through the first connecting port 124, and part of the water is discharged outward through the second connecting port 122 on the plug shell 121.

[0051] At the same time, the pin assembly 130 is correspondingly plugged into the insert sleeve 127, and the limiting ring 143 of the rubber protective sleeve 140 outside the pin assembly 130 is stopped by the end face of the insert sleeve 127, so that the guide rod 135 can expand the elastic shrinkage opening 142, and then the pin assembly 130 can be inserted into the insert sleeve 127 as a whole. At this time, the inner circumferential surface of the rubber protective sleeve 140 will enter the front end groove 1272 of the insert sleeve 127 under the friction force of the pin body 131 and the inner wall of the insert sleeve 127, and overlap into a double layer. The rubber protective sleeve 140 and the pin assembly 130 can make the water in the front end groove 1272 of the insert sleeve 127 be discharged outward through the third connecting port 1274. When the guide rod 135 enters the insert tube 127, it will push the slide column 165 to slide along the guide tube 128, so that the return spring 129 is compressed. When the slide column 165 and the guide tube 128 are blocked in the axial direction, the slide column 165 no longer slides along the inside of the insert tube 127. At this time, the conductive spring 136 on the guide rod 135 is located inside the conductive ring 162, but the conductive spring 136 does not contact the conductive ring 162, and the telescopic rod 164 on the slide column 165 corresponds to the limit groove 167. As the insertion continues, the annular boss 137 at the end of the guide rod 135 will be stuck in the annular groove 1652 on the sliding column 165. At the same time, the conical surface 138 on the annular boss 137 will slide with the first inclined surface 152 of the push rod 150, pushing the push rod 150 to slide, so that the second inclined surface 151 at the second end of the push rod 150 pushes the third inclined surface of the telescopic rod 164, so that the telescopic rod 164 extends from the sliding column 165 and enters the limiting groove 167, realizing the limiting of the sliding column 165 and the insert cylinder 127. At this time, the connecting spring 166 is compressed. Then continue to connect the plug 120 and the socket 110. At this time, the first clamping structure between the guide rod 135 and the pin body 131 is disengaged, so that the guide rod 135 slides in the slide groove 133, and then the conductive spring 136 between the guide rod 135 and the pin body 131 is compressed, so that the conductive spring 136 is radially deformed and the diameter increases, and the conductive spring 136 contacts the conductive ring 162, thereby realizing the conductive connection between the plug 120 and the socket 110.

[0052] When the plug 120 is separated from the socket 110, the guide rod 135 first slides along the slide groove 133, so that the guide rod 135 and the pin body 131 are re-engaged through the first engaging structure, so that the conductive spring 136 is stretched and the diameter is reduced, and the conductive spring 136 is separated from the conductive ring 162. Then, the annular boss 137 at the end of the guide rod 135 is separated from the annular groove 1652 on the slide post 165, so that the telescopic rod 164 is driven to extend from the limiting groove 167 under the elastic force of the connecting spring 166, so that the slide post 165 is separated from the plug tube 127. The telescopic rod 164 is reset through the cooperation of the third inclined surface and the second inclined surface 151 to push the push rod 150 to reset, and the slide post 165 is reset under the action of the reset spring 129. At the same time, as the guide rod 135 is disengaged from the insert tube 127, the outer circumference of the guide rod 135 and the inner wall of the insert tube 127 are in frictional contact with the inner circumference of the rubber protective sleeve 140. Under the action of friction, the rubber protective sleeve 140 returns to its initial state, and the elastic shrinkage opening 142 is tightened again to achieve the closure of the pin assembly 130.

[0053] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An underwater plug-in connector, characterized in that: The invention comprises a plug and a socket, wherein the socket comprises a socket shell, wherein a plurality of pin assemblies are arranged inside the socket shell, wherein the plug comprises a plug shell, wherein an inner cylinder is arranged inside the plug shell, wherein a plurality of insert cylinders are arranged inside the inner cylinder, wherein the socket shell can be inserted between the plug shell and the inner cylinder, wherein the pin assemblies correspond to the insert cylinders one by one and are plugged and matched, wherein the pin assemblies comprise a pin body and a guide rod, wherein the pin body is fixedly arranged on the socket shell, wherein the guide rod can slide along the pin body, wherein a conductive spring is connected between the end surface of the pin body and the end of the guide rod, wherein the conductive spring is spiral-shaped; A conductive ring is fixedly provided on the inner wall of the insert sleeve; a rubber protective sleeve is provided on the outer sleeve of the pin assembly, an opening is provided on the end of the rubber protective sleeve away from the pin body, a limiting ring is provided on the opening, the limiting ring holds the opening open, an elastic shrink opening is also provided at the position of the opening, the elastic shrink opening closes the opening of the rubber protective sleeve; when the pin assembly is plugged into the insert sleeve, the limiting ring cooperates with the end face of the insert sleeve to expand the elastic shrink opening, so that the guide rod and the conductive spring can be inserted into the conductive ring; then the guide rod slides along the pin body, so that the conductive spring radially expands and contacts with the conductive ring, thereby realizing the conductive connection between the plug and the socket.

2. The underwater plug connector according to claim 1, characterized in that: A sliding groove is provided on the pin body, and the guide rod is slidably set in the sliding groove. A first clamping structure is provided between the guide rod and the sliding groove, and the first clamping structure makes the guide rod in the longest extended state; the first clamping structure includes an annular groove located on the outer peripheral surface of the guide rod and a convex ring located on the inner wall of the sliding groove, and the annular groove and the convex ring are blocked and matched in the plug-in direction.

3. The underwater plug connector according to claim 2, characterized in that: A sliding column is arranged inside the conductive ring, the end of the guide rod is a truncated cone, a second clamping structure is arranged between the truncated cone and the end surface of the sliding column, and the second clamping structure clamps the truncated cone and the sliding column.

4. The underwater plug connector according to claim 3, characterized in that: An annular boss is arranged on the circular table, and an annular groove is arranged on the end surface of the sliding column. The annular boss and the annular groove are engaged with each other in a blocking manner in the plugging direction, and the annular boss and the annular groove constitute the second clamping structure.

5. The underwater plug connector according to claim 4, characterized in that: A guide cylinder is provided at the center of the insert cylinder, an insert rod is fixed on the slide column, the insert rod can slide along the guide cylinder, a return spring is provided on the outside of the insert rod and the guide cylinder, and both ends of the return spring are respectively matched with the end surface stops of the slide column and the insert cylinder, and the return spring can be compressed when the slide column slides along the inside of the insert cylinder.

6. The underwater plug connector according to claim 5, characterized in that: A third clamping structure is provided between the sliding column and the insert cylinder, and the third clamping structure includes a push rod, a telescopic rod and a limit groove. The push rod is slidably arranged on the sliding column, and the sliding direction of the push rod is parallel to the axis of the sliding column. The push rod has a first end and a second end. The first end of the push rod extends into the annular groove, and the annular boss can push the push rod to slide while being inserted into the annular groove. The telescopic rod is set to slide radially along the sliding column, and the limit groove is set on the inner wall of the insert cylinder; the sliding of the push rod enables its second end to push the telescopic rod to slide radially along the sliding column and insert into the limit groove.

7. The underwater plug connector according to claim 6, characterized in that: The second end of the push rod extends radially along the sliding column, and the second end of the push rod has a second inclined surface. The end of the telescopic rod close to the push rod is provided with a third inclined surface. The telescopic rod is arranged on the side wall of the sliding column through a connecting spring, and the connecting spring makes the third inclined surface contact with the second inclined surface.

8. The underwater plug connector according to claim 1, characterized in that: Two balanced pressure membranes are arranged between the inner tube and the multiple inserted tubes, and the two balanced pressure membranes are distributed along the axial direction of the inserted tubes. A sealing plate is arranged at one end of the inner tube facing the socket, and a sealed cavity is formed between the sealing plate and the balanced pressure membrane, and the sealed cavity is used to seal the outside of the multiple inserted tubes.

9. The underwater plug connector according to claim 8, characterized in that: The inner cylinder is provided with a first communication port, which is used to guide the water between the plug shell and the inner cylinder to between the inner cylinder and the balanced pressure membrane. The plug shell is provided with a second communication port, which is used to discharge the water between the plug shell and the inner cylinder to the outside of the plug.

10. The underwater plug connector according to claim 9, characterized in that: The insert tube has an insert end extending from the sealed cavity. The insert end is provided with a third communication port, and the third communication port is used to discharge water inside the insert tube to the outside of the plug.

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