Pin combined type cable penetrating device

Abstract

The invention belongs to the technical field of cable penetrating devices, and discloses a contact pin combined type cable penetrating device which comprises a cable penetrating device body and a straight plug connected to the tail end of the cable penetrating device body in an inserted mode. A front connector, an insulation sealing assembly, a pressing screw sleeve and a cable pressing block are sequentially arranged in the straight plug from top to bottom. Three jacks matched with the contact pins are formed in the front connector, and conductive cylinders and cable connecting contact pins are sequentially arranged in the jacks from top to bottom; compared with the prior art, through the arrangement of the straight plug, on one hand, three-phase cables are gathered in the front connector, circuit conduction can be achieved only by aligning the cable penetrating device main body with the straight plug and inserting the contact pins into the jacks, the process is simple, installation is convenient and fast, and on the other hand, the size of the straight plug can be adaptively adjusted according to the size of a well mouth; the method can be applied to different working conditions and is high in adaptability.

Description

Technical Field

[0001] The invention belongs to the technical field of cable crossers, and in particular relates to a pin-assembled cable crosser. Background Art

[0002] With the development of my country's oil exploration and development, the development of offshore oil wells and low-pressure oil wells has become more and more vigorous, and the electric submersible pump integrated oil production technology that matches it has also developed rapidly. The cable crossing device is a device used to penetrate the oil pipe hanger and upper flange on the electric submersible pump oil production wellhead and connect the downhole electric submersible pump and the well power supply. It has changed the traditional cable crossing method and has the characteristics of good safety, high sealing and easy operation.

[0003] In the prior art, the underground cable is usually inserted into the tail end of the cable crosser to achieve the conduction of the circuit. For example, the patent (CN209344744U) discloses a pin injection type underground cable crosser body, including a main body shell, a main body tail shell adapted to the main body shell at the end of the main body shell, an insulating pin and a cable stripping head arranged in the main body shell and the main body tail shell, and an upper insulating sealing molding, a middle insulating sealing molding and a lower insulating sealing molding are arranged in the main body shell and the main body tail shell in sequence, the insulating pin is injection molded by a mold, a protrusion is arranged on the insulating pin, a sealing block is arranged between the main body shell and the insulating pin, a pin pressing plate is arranged at the end of the sealing block, and the pin pressing plate is fixed to the sealing block by bolts.

[0004] The advantage of the above patent is that the structure is relatively simple, and the circuit is connected by connecting the insulating pins with the cable stripping head. However, it also has the following disadvantages: First, a main body tail shell needs to be added at the bottom of the cable crosser shell, which increases the length of the entire cable crosser and cannot be applied to smaller wellheads; second, an insulator (such as rubber, epoxy resin, etc.) needs to be injected into the gap between one end of the cable stripping head and the main body tail shell. The casting process is complicated and the internal filling degree cannot be effectively controlled. If gaps or holes appear, it will also affect the service life of the cable; third, the insulating pins and cable stripping heads need to correspond one by one and be connected pair by pair. The connection process is cumbersome and will consume a lot of time during the actual installation process, affecting the overall installation efficiency. Summary of the invention

[0005] In view of this, the present invention intends to provide a pin-assembled cable passer to solve the technical problem of complicated cable connection at the lower end of the cable passer in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A plug-in combined cable crossing device, comprising a cable crossing device body and a straight plug plugged into the tail end of the cable crossing device body, wherein three conductive rods distributed in a triangular shape are arranged inside the cable crossing device body, and the straight plug comprises a straight plug housing, wherein the upper end of the straight plug housing is provided with a connecting screw cover, and the lower end of the straight plug housing is provided with a tail housing, and the straight plug is provided with a front joint, an insulating sealing component, a compression screw sleeve and a cable pressing block in sequence from top to bottom, and the armored cable is fixed by the cable pressing block and dispersed into three cable lines extending upward; three plug holes matching the plug pins are provided in the front joint, and a conductive cylinder and a cable connecting plug pin are arranged in sequence from top to bottom in the plug hole, and the two ends of the cable connecting plug pin are respectively plugged into the conductive cylinder and the cable line; Furthermore, the insulating sealing assembly is a split structure, which includes a first sealing plate, a second sealing plate, a third sealing plate, a fourth sealing plate, a compression sleeve and a corrugated elastic gasket arranged in sequence from top to bottom, wherein a card slot and a sealing protrusion are arranged on the contact surfaces between the first sealing plate, the second sealing plate and the third sealing plate, the sealing protrusion is inserted into the card slot to form a stable mechanical lock, and a gap is left between the sealing protrusion and the card slot; Further, a first through hole is formed on the first sealing plate, a first cylindrical protrusion is provided on the inner side of the first through hole, the wall thickness of the first cylindrical protrusion gradually decreases in the direction away from the first through hole, an annular first groove is provided at the outer opening of the first through hole, a second groove is provided at the edge of the outer side of the first sealing plate, and the material of the first sealing plate is tetrapropylene fluororubber; Further, a second through hole is formed on the second sealing plate, a first sealing protrusion is provided on the inner side of the second through hole, a second sealing protrusion is provided at the inner edge of the second sealing plate, the first sealing protrusion and the second sealing protrusion are respectively inserted into the first slot and the second slot; a third slot is provided at the outer opening of the second through hole, and a fourth slot is provided at the edge of the outer side of the second sealing plate; Further, a third through hole is formed on the third sealing plate, a third sealing protrusion is provided on the inner side of the third through hole, a fourth sealing protrusion is provided at the inner edge of the third sealing plate, the third sealing protrusion and the fourth sealing protrusion are respectively inserted into the third clamping groove and the fourth clamping groove, a second cylindrical protrusion is provided at the outer opening of the third through hole, the wall thickness of the second cylindrical protrusion gradually decreases in the direction away from the third through hole, and the second sealing plate and the third sealing plate are both made of hydrogenated nitrile rubber; Further, a fourth through hole is formed on the fourth sealing plate, the second cylindrical protrusion is inserted into the fourth through hole, and a gap is left between the inner wall of the fourth through hole and the outer wall of the second cylindrical protrusion; deformation reserved holes are opened between adjacent fourth through holes, and the deformation reserved holes form an equilateral triangle distribution, and the fourth sealing plate is made of polyetheretherketone; Furthermore, sealing rings are integrally formed on the side surfaces of the first sealing plate, the second sealing plate and the third sealing plate, for sealing between the sealing plate and the straight plug housing; Furthermore, the cable pressing block is located at the rear end of the rear housing, and a space for accommodating the flat armored cable is formed between the two cable pressing blocks arranged opposite to each other up and down. The cable pressing block is fixed to the rear housing by screws, and the cable pressing block is fixed to the armored cable by screws; Furthermore, the length of the conductive tube is less than that of the front connector and the conductive tube is located inside the front connector. A first accommodation space is provided at the upper end of the conductive tube, and the opening of the first accommodation space is expanded outward to facilitate the alignment of the pin. A second accommodation space is provided at the lower end of the conductive tube, and the first accommodation space and the second accommodation space are connected through a connecting hole. Furthermore, the cable connecting pin includes a needle head and a needle tail. The needle head is inserted into the second accommodating space. A threaded hole is opened at the center position of the end face of the free end of the needle head along the length direction of the needle head. The head of the connecting screw is located in the first accommodating space, and its rod passes through the connecting hole into the second accommodating space and is threadedly connected with the needle head. The needle tail is located outside the conductive cylinder and the outer wall of the needle tail contacts the inner wall of the front connector. A connecting groove is opened at the center position of the end face of the needle tail away from one end of the needle head. A cable stripping head is formed at the free end of the cable, and the cable stripping head is inserted into the connecting groove.

[0007] The beneficial effects of the present invention are: Compared with the prior art, the compression screw sleeve is rotated to move toward the insulating sealing assembly, and the insulating sealing assembly is squeezed to achieve sealing, thereby completing the installation of the entire straight plug. By setting the straight plug, on the one hand, the three-phase cable is collected in the front joint, and the circuit conduction can be achieved by aligning the cable through the main body of the device and the straight plug and inserting the pin into the jack. The process is simple and the installation is convenient. On the other hand, the size of the straight plug can be adaptively adjusted according to the wellhead size, and can be applied to different working conditions, with strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 is a cross-sectional view of the main body of the cable pass-through device in the first embodiment of the present invention; Figure 2 is a cross-sectional view of a straight plug in Embodiment 1 of the present invention; Figure 3 for Figure 2 The enlarged view of A1 in the middle; Figure 4 is a schematic diagram of a first sealing plate in Embodiment 1 of the present invention; Figure 5 is a schematic diagram of the second sealing plate in the first embodiment of the present invention, used to show the first sealing protrusion and the second sealing protrusion; Figure 6It is a schematic diagram of the second sealing plate in the first embodiment of the present invention, used to show the third card slot and the fourth card slot; Figure 7 It is a schematic diagram of the third sealing plate in the first embodiment of the present invention, used to show the third sealing protrusion and the fourth sealing protrusion; Figure 8 is a schematic diagram of the third sealing plate in the first embodiment of the present invention, used to show the second cylindrical protrusion; Fig. 9 is a schematic diagram of a fourth sealing plate in Embodiment 1 of the present invention; Fig.10 It is a schematic diagram of the compression sleeve in the first embodiment of the present invention.

[0009] The following are marked in the accompanying drawings: Cable crossing device body 1, main body shell 11, conductive rod 12, pin 13, straight plug 2, straight plug shell 201, connecting screw cover 202, tail shell 203, front connector 204, lip seal 2041, jack 2042, insulating seal assembly 205, first sealing plate 2051, first through hole 212, first cylindrical protrusion 213, first card slot 214, second card slot 215, second sealing plate 2052, second through hole 216, first sealing protrusion 217, second sealing protrusion 218, third card slot 219, fourth card slot 220, third sealing plate 20 53, third through hole 221, third sealing protrusion 222, fourth sealing protrusion 223, second cylindrical protrusion 224, fourth sealing plate 2054, fourth through hole 225, deformation reserved hole 226, compression sleeve 2055, corrugated elastic washer 2056, compression screw sleeve 206, cable pressing block 207, armored cable 208, cable line 2081, conductive cylinder 209, first accommodating space 2091, second accommodating space 2092, connecting hole 2093, cable connecting pin 210, needle head 2101, needle tail 2102, connecting groove 2103, connecting screw 211. DETAILED DESCRIPTION

[0010] Embodiment 1, see Figure 1-Figure 10 .

[0011] A pin-combined cable crossing device comprises a cable crossing device body 1 and a straight plug 2 plugged into the rear end of the cable crossing device body 1.

[0012] like Figure 1 As shown, the cable transit body 1 includes a main shell 11, and three conductive rods 12 distributed in an equilateral triangle are arranged inside the main shell 11. Pins 13 are formed at both ends of the conductive rods 12. The structure of the cable transit body 1 is the existing technology and will not be described in detail here.

[0013] The straight plug 2 includes a straight plug housing 201 with two ends open and a hollow interior. The upper end of the straight plug housing 201, that is, the end facing the cable passer body 1, is provided with a connecting screw cover 202. It is worth further explaining that a step is formed on the upper end of the straight plug housing 201, and the inner wall of the connecting screw cover 202 contacts the step surface, and the connecting screw cover 202 is limited by the step kick surface. A plurality of first fixing holes are evenly spaced along the circumferential direction on the step surface of the straight plug housing 201, and the depth of the first fixing hole is less than the wall thickness of the straight plug housing 201, and a thread is provided in the first fixing hole. A threaded hole matching the first fixing hole is provided at the lower end of the connecting screw cover 202, and a first fixing screw is provided in the threaded hole, and the connecting screw cover 202 is fixedly connected to the straight plug housing 201 by the first fixing screw.

[0014] A tail shell 203 is provided at the lower end of the straight plug housing 201. The tail shell 203 also has openings at both ends and an inner middle portion. One end of the tail shell 203 is sleeved on the outer periphery of the straight plug housing 201. A second fixing hole is opened on the straight plug housing 201. The second fixing screw passes through the tail shell 203 and penetrates into the second fixing hole to achieve a fixed connection between the straight plug housing 201 and the tail shell 203.

[0015] The straight plug 2 is provided with a front connector 204, an insulating seal assembly 205, a compression screw sleeve 206 and a cable pressing block 207 in sequence from top to bottom along the height direction. The armored cable 208 is fixed by the cable pressing block 207 and is divided into three cables 2081 extending upward. Figure 1 As shown, the lower section of the front joint 204 is threadedly connected to the straight plug housing 201 to achieve fixation of the two; two O-ring sealing structures are provided between the middle section of the front joint 204 and the straight plug housing 201 to ensure the sealing between the front joint 204 and the straight plug housing 201; a lip-shaped sealing ring 2041 is provided between the upper section of the front joint 204 and the connecting screw cover 202, and the lip-shaped sealing ring 2041 is deformed by extrusion to achieve sealing between the front joint 204 and the connecting screw cover 202.

[0016] The outer diameter of the upper section of the front connector 204 is smaller than the inner diameter of the opening of the connecting end of the connecting screw cover 202. An internal thread is provided on the inner wall of the connecting end of the connecting screw cover 202, and an external thread is provided on the outer wall of the lower end of the main shell 11. The cable pass-through body 1 and the straight plug 2 are fixedly connected through the above-mentioned internal and external threads.

[0017] The front connector 204 is provided with three sockets 2042 matching the plug pins 13. The sockets 2042 are provided with a conductive cylinder 209 and a cable connection plug pin 210 from top to bottom. The two ends of the cable connection plug pin 210 are respectively plugged with the conductive cylinder 209 and the cable 2081. The length of the conductive cylinder 209 is less than the length of the front connector 204 and the conductive cylinder 209 is located inside the front connector 204. The upper end of the conductive cylinder 209 is provided with a columnar first accommodation space 2091. The cross-sectional dimensions of the first accommodation space 2091 are consistent with the cross-sectional dimensions of the plug pin 13, and the opening of the first accommodation space 2091 is expanded outward to facilitate the alignment of the plug pin 13. An elastic electrode ring is provided in the first accommodation space 2091, and the elastic electrode ring increases the contact area between the plug pin 13 and the front connector 204, thereby enhancing the contact stability and conductivity between the two.

[0018] A second columnar accommodating space 2092 is also provided at the lower end of the conductive tube 209. The first accommodating space 2091 and the second accommodating space 2092 are connected via a connecting hole 2093. It should be emphasized that the axes of the conductive tube 209, the first accommodating space 2091, the second accommodating space 2092 and the connecting hole 2093 coincide, and the inner diameter of the first accommodating space 2091 and the inner diameter of the second accommodating space 2092 are both larger than the inner diameter of the connecting hole 2093.

[0019] The cable connection pin 210 includes Figure 3 The cylindrical needle head 2101 and the cylindrical needle tail 2102 are shown, the diameter of the needle head 2101 is smaller than the diameter of the needle tail 2102 and the axes of the two coincide, and the needle head 2101 is inserted into the second accommodation space 2092. A threaded hole is provided at the center of the free end surface of the needle head 2101 along the length direction of the needle head 2101, the head of the connecting screw 211 is located in the first accommodation space 2091, and its shaft passes through the connecting hole 2093 and enters the second accommodation space 2092 and is threadedly connected with the needle head 2101, and the head of the connecting screw 211 abuts against the bottom surface of the first accommodation space 2091. The cable connection pin 210 is fixedly connected to the conductive cylinder 209 by the connecting screw 211 to prevent the needle head of the cable connection pin 210 from falling off from the second accommodation space 2092. In addition, an elastic electrode ring is also provided in the second accommodation space 2902.

[0020] The needle tail 2102 is located outside the conductive cylinder 209 and the outer wall of the needle tail 2102 contacts the inner wall of the front connector 204. A connection groove 2103 is provided at the center of the end face of the needle tail 2102 away from the needle head 2101. The depth of the connection groove 2103 is less than the length of the needle tail 2102. A cable stripping head is formed at the free end of the cable 2081, and the cable stripping head is inserted into the connection groove 2103. A third fixing hole is provided on the side of the needle tail 2102. A third fixing screw is connected to the inner thread of the third fixing hole. The cable stripping head is pressed and fixed by the third fixing screw. In addition, an O-ring sealing structure is also provided on the needle tail 2102 for sealing between the needle tail 2102 and the front connector 204.

[0021] Since the cable connection pin 210 is used for power transmission, it is necessary to set a sealing component at the tail end of the pin tail 2102. The sealing component is squeezed by the compression screw sleeve 206 to deform it so as to achieve insulation sealing for the tail end of the pin tail 2102. Firstly, it can prevent current leakage and reduce the risk of circuit short circuit. Secondly, it can prevent moisture, gas and other foreign matter in the external environment from entering the interior of the straight plug 2 along the gap around the cable connection pin 210, causing erosion and damage to the internal structure of the straight plug 2. In the prior art, the sealing component usually adopts an integrally formed columnar seal. During the extrusion deformation process, the deformation of the seal mainly comes from the deformation of the material itself, that is, the material of the seal becomes a key factor affecting the insulation sealing effect; in addition, when the external force acts on the end of the seal, the deformation of the seal along its length direction is constantly changing, resulting in local differentiation of the sealing effect, which is specifically manifested in that the deformation on the side of the force-bearing end is significantly greater than the deformation on the side away from the force-bearing end.

[0022] Based on this, in this embodiment, the insulating sealing assembly 205 is a split structure and is sleeved on the periphery of the three cables 2081. It includes a first sealing plate 2051, a second sealing plate 2052, a third sealing plate 2053, a fourth sealing plate 2054, a compression sleeve 2055 and a corrugated elastic gasket 2056 arranged from top to bottom, wherein the contact surfaces between the first sealing plate 2051, the second sealing plate 2052 and the third sealing plate 2053 are relatively provided with card grooves and sealing protrusions, and the protrusions are embedded in the card grooves to form a stable mechanical lock.

[0023] like Figure 1As shown, three first through holes 212 for passing the cable 2081 are formed on the first sealing plate 2051. A first cylindrical protrusion 213 is integrally formed on the side (i.e., the inner side) of the first through hole 212 facing the conductive cylinder 209. The wall thickness of the first cylindrical protrusion 213 gradually decreases in the direction away from the first through hole 212. Since the cable connection pin 210 is located inside the front connector 204, a cylindrical gap is left between the tail of the cable connection pin 210 and the tail of the front connector 204, and the first cylindrical protrusion 213 is just inserted into the above gap to achieve sealing. Especially under the extrusion of external force, the first cylindrical protrusion 213 produces radial expansion deformation, and the sealing effect is further enhanced. In this embodiment, the material of the first sealing plate 2051 is tetrafluoroethylene rubber (AFLAS), which has excellent resistance to compression permanent deformation in high temperature environment.

[0024] A first clamping groove 214 is provided at the outer opening of the first through hole 212. The first clamping groove 214 is annular, and its outer diameter remains unchanged, while its inner diameter gradually increases from the outside to the inside and its initial inner diameter is consistent with the inner diameter of the first through hole 212. A second clamping groove 215 is provided at the edge of the outer side surface of the first sealing plate 2051. The second clamping groove 215 is also annular, and its inner diameter remains unchanged, while its outer diameter gradually decreases from the outside to the inside and its initial outer diameter is consistent with the diameter of the first sealing plate 2051.

[0025] Three second through holes 216 for passing the cable 2081 are formed on the second sealing plate 2052. A first sealing protrusion 217 is integrally formed on the side (i.e., the inner side) of the second through hole 216 facing the first sealing plate 2051. A second sealing protrusion 218 is integrally formed at the inner edge of the second sealing plate 2052. The first sealing protrusion 217 matches the shape and structure of the first card groove 214, and the second sealing protrusion 218 matches the shape and structure of the second card groove 215. The first sealing protrusion 217 and the second sealing protrusion 218 are respectively inserted into the first card groove 214 and the second card groove 215.

[0026] A third card slot 219 is provided at the outer opening of the second through hole 216. The shape and structure of the third card slot 219 are the same as those of the first card slot 214, so they are not described in detail; a fourth card slot 220 is provided at the edge of the outer side surface of the second sealing plate 2052. The shape and structure of the fourth card slot 220 are the same as those of the second card slot 215, so they are not described in detail.

[0027] Three third through holes 221 for passing the cable 2081 are formed on the third sealing plate 2053. A third sealing protrusion 222 is integrally formed on the side (i.e., the inner side) of the third through hole 221 facing the second sealing plate 2052. A fourth sealing protrusion 223 is integrally formed at the inner edge of the third sealing plate 2053. The third sealing protrusion 222 matches the shape and structure of the third card slot 219. The fourth sealing protrusion 223 matches the shape and structure of the fourth card slot 220. The third sealing protrusion 222 and the fourth sealing protrusion 223 are respectively inserted into the third card slot 219 and the fourth card slot 220.

[0028] A second cylindrical protrusion 224 is formed at the outer opening of the third through hole 221 . The second cylindrical protrusion 224 is integrally formed with the third sealing plate 2053 . The wall thickness of the second cylindrical protrusion 224 gradually decreases in a direction away from the third through hole 221 .

[0029] It should be emphasized that in this embodiment, the second sealing plate 2052 and the third sealing plate 2053 are made of hydrogenated nitrile rubber, which has excellent performance, including excellent corrosion resistance, wear resistance, and resistance to compression permanent deformation. In addition, the first sealing plate 2051, the second sealing plate 2052, and the third sealing plate 2053 are all integrally formed with sealing rings on their sides, and the cross section of the sealing rings is an arc surface, which is used for sealing between the sealing plate and the straight plug housing 201.

[0030] The fourth sealing plate 2054 is formed with three fourth through holes 225 for passing the cable 2081. The second cylindrical protrusion 224 is inserted into the fourth through hole 225, and a gap is left between the inner wall of the fourth through hole 225 and the outer wall of the second cylindrical protrusion 224. Deformation reserved holes 226 are provided between adjacent fourth through holes 225, and the three deformation reserved holes 226 also form an equilateral triangle distribution. It is worth further explaining that in this embodiment, the fourth sealing plate 2054 is made of polyetheretherketone (PEEK) and has a certain rigidity. The deformation reserved holes 226 can ensure that a certain degree of deformation can be generated inside it under the action of external force, thereby preventing the fourth sealing plate 2054 from breaking.

[0031] The compression sleeve 2055 is hollow inside, and the corrugated elastic washer 2056 is between the compression sleeve 2055 and the compression screw sleeve 206. The corrugated elastic washer 2056 can not only absorb vibration and impact, but also effectively adjust the pre-tightening force of the compression screw sleeve 206. Figure 2 As shown, an inner wall of the rear end of the front joint 204 is provided with an internal thread, and an outer wall of the compression screw sleeve 206 is provided with an external thread matching the internal thread, so that the compression screw sleeve 206 and the front joint 204 are threadedly connected.

[0032] The cable clamp 207 is located at the rear end of the rear shell 203. It should be emphasized that a space for accommodating a flat armored cable 208 is formed between the two cable clamps 207 arranged opposite each other up and down. The cable clamp 207 and the rear shell 203 are fixed by screws. The cable clamp 207 and the armored cable 208 are also fixed by screws, and the screws pass through the rear shell 203 and the cable clamp 207.

[0033] After the above parts are preliminarily assembled and formed, the compression screw sleeve 206 is rotated to move the compression screw sleeve 206 toward the insulating sealing component 205, and the insulating sealing component 205 is squeezed to achieve sealing, thereby completing the installation of the entire straight plug 2. By setting the straight plug 2, on the one hand, the three-phase cable is collected in the front connector 204, and the circuit conduction can be achieved by aligning the cable through the device body 1 and the straight plug 2 and inserting the pin 13 into the jack 2042. The process is simple and the installation is convenient. On the other hand, the size of the straight plug 2 can be adaptively adjusted according to the wellhead size, and can be applied to different working conditions, with strong adaptability.

[0034] In addition, by adopting an insulating sealing component 205 with a split structure, the insulating sealing component 205 is squeezed and deformed under the action of external force. In addition to the deformation caused by its own material, this deformation is more caused by the structural deformation between different sealing plates, especially the mutual extrusion of the second sealing plate 2052 and the first sealing plates 2051 and the third sealing plates 2053 on both sides on the structural surface. Specifically, the sealing protrusion is inserted into the relatively set groove to form a stable mechanical lock, and a gap is left between the sealing protrusion and the groove. The cooperation between the protrusion and the groove not only provides structural fixation, but also utilizes the elastic deformation of the material to fill the tiny gap, thereby achieving a good sealing effect without using any adhesive.

[0035] Compared with the local differentiation of the degree of deformation of the one-piece seal due to its own material, the structural deformation of the split seal can not only make the overall deformation of the seal more uniform, but also bring a larger deformation amount, providing a more excellent insulation sealing effect. In this embodiment, the extrusion deformation of the first sealing plate 2051, the second sealing plate 2052 and the third sealing plate 2053 can prevent external gas and moisture from contacting the cable connection pin 210, the conductive tube 209 and other related conductive parts, especially against the high-pressure environment formed by the blowout well, and secondly, it can protect and buffer the internal cable 2081 to ensure the normal use of the cable 2081.

[0036] It is worth mentioning that when the compression screw sleeve 206 is screwed in, the friction of the contact surface will drive the compression sleeve 2055 to rotate synchronously. When the compression sleeve 2055 is in direct contact with the third sealing plate 2053, the contact surface of the third sealing plate 2053 made of flexible material is relatively rough, so the third sealing plate 2053 will be deformed under the friction of the compression sleeve 2055, thereby affecting the sealing effect. Therefore, a fourth sealing plate 2054 is arranged between the third sealing plate 2053 and the compression sleeve 2055. The fourth sealing plate 2054 is made of engineering plastic polyetheretherketone, which has a smooth surface and a certain hardness. The compression sleeve 2055 and the fourth sealing plate 2054 are in smooth contact. The fourth sealing plate 2054 will not rotate with the compression sleeve 2055 and transmits the external force to the third sealing plate 2053 evenly.

[0037] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A pin-assembled cable pass-through, characterized in that: It includes a cable crossing device body and a straight plug plugged into the tail end of the cable crossing device body. Three conductive rods distributed in a triangle are arranged inside the cable crossing device body. The straight plug includes a straight plug shell. A connecting screw cover is arranged at the upper end of the straight plug shell. A tail shell is arranged at the lower end of the straight plug shell. A front joint, an insulating sealing component, a compression screw sleeve and a cable pressing block are arranged in sequence from top to bottom in the straight plug. The armored cable is fixed by the cable pressing block and dispersed into three cable lines extending upward. Three sockets matching the pins are opened in the front joint. A conductive cylinder and a cable connecting pin are arranged in sequence from top to bottom in the socket. Both ends of the cable connecting pin are respectively plugged into the conductive cylinder and the cable line.

2. The pin-assembled cable pass-through device according to claim 1, characterized in that: The insulating sealing assembly is a split structure, which includes a first sealing plate, a second sealing plate, a third sealing plate, a fourth sealing plate, a compression sleeve and a corrugated elastic gasket arranged in sequence from top to bottom, wherein the contact surfaces between the first sealing plate, the second sealing plate and the third sealing plate are relatively provided with card grooves and sealing protrusions, the sealing protrusions are inserted into the card grooves to form a stable mechanical lock, and a gap is left between the sealing protrusions and the card grooves.

3. The pin-assembled cable pass-through device according to claim 2, characterized in that: A first through hole is formed on the first sealing plate, a first cylindrical protrusion is provided on the inner side of the first through hole, the wall thickness of the first cylindrical protrusion gradually decreases in the direction away from the first through hole, a first annular groove is provided at the outer opening of the first through hole, a second groove is provided at the edge of the outer side of the first sealing plate, and the material of the first sealing plate is tetrapropylene fluororubber.

4. The pin-assembled cable pass-through device according to claim 3, characterized in that: A second through hole is formed on the second sealing plate, a first sealing protrusion is provided on the inner side of the second through hole, a second sealing protrusion is provided at the inner edge of the second sealing plate, the first sealing protrusion and the second sealing protrusion are respectively inserted into the first slot and the second slot; a third slot is provided at the outer opening of the second through hole, and a fourth slot is provided at the edge of the outer side of the second sealing plate.

5. The pin-assembled cable pass-through device according to claim 4, characterized in that: A third through hole is formed on the third sealing plate, a third sealing protrusion is provided on the inner side of the third through hole, a fourth sealing protrusion is provided at the inner edge of the third sealing plate, the third sealing protrusion and the fourth sealing protrusion are respectively inserted into the third slot and the fourth slot, a second cylindrical protrusion is provided at the outer opening of the third through hole, the wall thickness of the second cylindrical protrusion gradually decreases in the direction away from the third through hole, and the second sealing plate and the third sealing plate are both made of hydrogenated nitrile rubber.

6. The pin-assembled cable pass-through device according to claim 5, characterized in that: A fourth through hole is formed on the fourth sealing plate, the second cylindrical protrusion is inserted into the fourth through hole and a gap is left between the inner wall of the fourth through hole and the outer wall of the second cylindrical protrusion; deformation reserved holes are opened between adjacent fourth through holes, and the deformation reserved holes form an equilateral triangle distribution. The fourth sealing plate is made of polyetheretherketone.

7. The pin-assembled cable pass-through device according to claim 6, characterized in that: Sealing rings are integrally formed on the side surfaces of the first sealing plate, the second sealing plate and the third sealing plate, and are used for sealing between the sealing plates and the straight plug housing.

8. The pin-assembled cable pass-through device according to claim 7, characterized in that: The cable clamp is located at the rear end of the rear shell, and a space for accommodating a flat armored cable is formed between two cable clamps arranged opposite to each other up and down. The cable clamp is fixed to the rear shell by screws, and the cable clamp is fixed to the armored cable by screws.

9. The pin-assembled cable pass-through according to claim 1 or 8, characterized in that: The length of the conductive tube is smaller than that of the front joint and the conductive tube is located inside the front joint. A first accommodating space is provided at the upper end of the conductive tube, and the opening of the first accommodating space is expanded outward to facilitate the alignment of the pin. A second accommodating space is provided at the lower end of the conductive tube, and the first accommodating space and the second accommodating space are connected through a connecting hole.

10. The pin-assembled cable pass-through device according to claim 9, characterized in that: The cable connecting pin includes a needle head and a needle tail. The needle head is inserted into the second accommodating space. A threaded hole is opened at the center position of the end face of the free end of the needle head along the length direction of the needle head. The head of the connecting screw is located in the first accommodating space, and its rod passes through the connecting hole into the second accommodating space and is threadedly connected with the needle head. The needle tail is located outside the conductive cylinder and the outer wall of the needle tail contacts the inner wall of the front connector. A connecting groove is opened at the center position of the end face of the needle tail away from one end of the needle head. A cable stripping head is formed at the free end of the cable, and the cable stripping head is inserted into the connecting groove.

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