An N-type male connector and a coaxial cable jumper including the same

Abstract

The present invention relates to the technical field of coaxial cable jumper manufacturing, and in particular to an N-type male connector and a coaxial cable jumper including the same. When the N-type male connector realizes the docking and assembly operation with the coaxial cable, a tightening sleeve is innovatively introduced, and the tightening sleeve can shrink automatically when subjected to the circumferential extrusion force, that is, in the process of the tightening sleeve penetrating into the pin, the tightening sleeve undergoes radial contraction deformation, and the center conductor of the coaxial cable can be tightly embraced. In this way, on the one hand, the difficulty of operation when the N-type male connector is docked with the coaxial cable can be reduced, and no professional tools and equipment are required for auxiliary production; on the other hand, when the N-type male connector is to be dismantled, it is only necessary to release the soldering fixed connection between its conductive shell and the outer conductor of the coaxial cable, and drag the N-type male connector axially, so that the tightening sleeve can be removed from the pin insertion cavity, and the structural integrity and functional integrity of the N-type male connector after being dismantled are not damaged.

Description

Technical Field

[0001] The invention relates to the technical field of coaxial cable jumper manufacturing, in particular to an N-type male connector and a coaxial cable jumper comprising the same. Background Art

[0002] The N-type connector is one of the RF coaxial connectors, used to connect coaxial cables. It is widely used in fields that require high power carrying capacity, good RF performance, and the ability to work with larger coaxial cables. According to different application scenarios, the structure of the N-type connector is divided into male or female.

[0003] As far as the current technical status is concerned, the termination methods of N-type connectors are mainly composed of snap-in / soldering, crimping / soldering, and soldering / soldering. Specifically, the conductive shell of the N-type connector and the insulation layer of the coaxial cable are connected by soldering, while the connection methods between the N-type connector pin and the center conductor of the coaxial cable are generally divided into snap-in, crimping, and welding. Whether it is snap-in, crimping, or soldering, the operation is difficult when docking with the coaxial cable, and in some cases, professional tools and equipment are required for auxiliary construction, which is time-consuming and labor-intensive, and the implementation cost remains high. Furthermore, after the docking with the coaxial cable is completed, the N-type connector is difficult to dismantle and replace or reuse due to the irreversible fixed connection between the N-type connector pin and the center conductor of the coaxial cable. Therefore, technical personnel are urgently needed to solve the above problems. Summary of the invention

[0004] Therefore, in view of the above existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and continued to experiment and modify after many years of R&D experience in this industry, which ultimately led to the emergence of the N-type male connector.

[0005] In order to solve the above technical problems, the present invention relates to an N-type male connector, including a screw sleeve, a conductive shell, a retaining spring, an insulator, a pin and a tightening sleeve. With the central axis of the pin as a reference, the insulator, the conductive shell and the screw sleeve are concentrically sleeved in sequence from the inside to the outside. The conductive shell circumferentially wraps the outer conductor of the coaxial cable and is connected and fixed. After assembly, under the action of the elastic force and the clamping force generated by the retaining spring, the screw sleeve is free from axial movement relative to the conductive shell. The tightening sleeve is inserted into the pin, and it is used as a connection transition between the pin and the center conductor of the coaxial cable. An insertion cavity for accommodating the tightening sleeve is formed on the pin. In the process of the tightening sleeve penetrating into the pin, it automatically undergoes radial contraction deformation due to the circumferential extrusion force from the side wall of the insertion cavity, so that the center conductor of the coaxial cable is tightly held.

[0006] As a further improvement of the technical solution disclosed in the present invention, the tightening sleeve is in the shape of a semi-closed cylinder, and an open groove and an annular interference protrusion are formed on it at the same time. The number of the open groove is at least 1, and it extends along the length direction of the tightening sleeve. The annular interference protrusion is formed by pressing the circumferential outer wall mold of the tightening sleeve, and the number of the annular interference protrusion is set to be multiple, and it is arranged in a linear array along the length direction of the tightening sleeve. In the process of the tightening sleeve penetrating into the insertion cavity, the annular interference protrusion is forcibly squeezed into the insertion cavity, and the slot width of the open groove is reduced.

[0007] As a further improvement of the technical solution disclosed in the present invention, when the number of the opening groove is only 1, a process groove is formed on the tension sleeve. The process groove is formed on the circumferential inner side wall of the tension sleeve by removing material and is arranged opposite to the opening groove.

[0008] As a further improvement of the technical solution disclosed in the present invention, the wall thickness of the tightening sleeve is t1, and the depth of the process sink is t2, then 2 / 5t1≤t2≤3 / 5t1.

[0009] As a further improvement of the technical solution disclosed in the present invention, along the insertion direction of the tightening sleeve, the outer diameter values ​​of the plurality of sequentially arranged annular interference protrusions show a gradually decreasing trend.

[0010] As a further improvement of the technical solution disclosed in the present invention, the material of the tightening sleeve is preferably tin bronze or beryllium bronze.

[0011] As a further improvement of the technical solution disclosed in the present invention, after the conductive shell is put into place relative to the outer conductor of the coaxial cable, the two are fixedly connected by soldering.

[0012] In addition, the present invention also discloses a coaxial cable jumper, which includes a coaxial cable, a protective sleeve and at least one of the above-mentioned N-type male connectors. The end of the N-type male connector away from the coaxial cable is an open end. After the N-type male connector and the coaxial cable are connected, the protective sleeve is used to seal and protect the joint formed between the two.

[0013] As a further improvement of the technical solution disclosed in the present invention, the protective sleeve is preferably selected as any one of a plastic injection molded body and a thermoplastic sleeve.

[0014] As for the N-type male connector of the protection subject, it pioneered the introduction of a tightening sleeve when realizing the docking assembly operation with the coaxial cable, and the tightening sleeve can shrink by itself when subjected to circumferential extrusion force, that is, in the process of the tightening sleeve penetrating into the pin, the tightening sleeve can automatically undergo radial contraction deformation, and the center conductor of the coaxial cable inserted into the tightening sleeve insertion cavity can be clamped. In this way, on the one hand, the difficulty of operation when the N-type male connector is connected to the coaxial cable can be effectively reduced, and no professional tools and equipment are required for auxiliary production, which saves time and effort and is conducive to the control of overall construction costs; on the other hand, when the N-type male connector is to be dismantled, it is only necessary to use a heating gun to release the soldering fixed connection between its conductive shell and the outer conductor of the coaxial cable, and then drag the N-type male connector axially, and the tightening sleeve can be smoothly removed from the pin insertion cavity. In this way, not only the construction convenience can be greatly improved, but also the structural integrity and functional integrity of the N-type male connector after being dismantled are not damaged, which is conducive to achieving the design purpose of secondary reuse; on the other hand, thanks to the application of the self-tightening technology of the tightening sleeve, not only the coaxial cable jumper after molding has excellent power transmission performance, but also the occurrence of poor contact between the center conductor and the pin caused by the defects of the traditional soldering construction process can be eliminated.

[0015] As for the coaxial cable jumper, another protection subject, in actual construction, it can be conveniently and quickly connected and disconnected with the N-type male connector, and the N-type male connector is protected from mechanical damage during the implementation process. Furthermore, after the connection is completed, the protective cover is used to seal the joint between the N-type male connector and the coaxial cable to ensure that the coaxial cable jumper is protected from external dust and moisture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of a certain type of coaxial cable jumper disclosed in the present invention.

[0018] Figure 2 It is a structural schematic diagram of the coaxial cable in the coaxial cable jumper disclosed in the present invention (with the end being stripped).

[0019] Figure 3 The invention discloses a schematic diagram of the structure of an N-type male connector in a coaxial cable jumper.

[0020] Figure 4 The present invention is a schematic diagram of the state of the coaxial cable center conductor in the coaxial cable jumper disclosed by the present invention when the operation of mating with the pin is being performed.

[0021] Figure 5 It is a schematic diagram of the state after the coaxial cable and the N-type male connector in the coaxial cable jumper disclosed by the present invention are connected.

[0022] Figure 6 It is a three-dimensional schematic diagram from one viewing angle of a first embodiment of a tightening sleeve in an N-type male connector disclosed in the present invention.

[0023] Figure 7 It is a three-dimensional schematic diagram from another viewing angle of the first embodiment of the tightening sleeve in the N-type male connector disclosed in the present invention.

[0024] Figure 8 It is a three-dimensional schematic diagram from one viewing angle of a second embodiment of a tightening sleeve in an N-type male connector disclosed in the present invention.

[0025] Fig. 9 It is a three-dimensional schematic diagram from another perspective of the second embodiment of the tightening sleeve in the N-type male connector disclosed in the present invention.

[0026] 1-coaxial cable; 11-center conductor; 12-insulating layer; 13-outer conductor; 131-tinning bath; 14-protective outer skin; 2-protective sleeve; 3-N-type male connector; 31-screw; 32-conductive shell; 33-circlip; 34-insulator; 35-pin; 36-tightening sleeve; 361-opening groove; 362-annular interference protrusion; 363-process sinking groove. DETAILED DESCRIPTION

[0027] It is known that a radio frequency coaxial cable jumper is a cable assembly used to connect short-distance communications between devices, and is typically used to connect between communication devices (such as combiners, antennas, etc.) to achieve data transmission and communication.

[0028] The present invention will be further described in detail below in conjunction with specific embodiments. Figure 1 1 is a schematic diagram of the structure of a certain type of coaxial cable jumper disclosed in the present invention. It can be seen that it is composed of a coaxial cable 1, two protective sleeves 2 and two N-type male connectors 3. The two N-type male connectors 3 are respectively assembled at both ends of the coaxial cable 1, and the joint formed between the two is sealed and protected by the protective sleeves 2 to ensure that the coaxial cable jumper is protected from external dust and moisture.

[0029] Depending on the severity of the pre-application site environment, the protective sleeve 2 can be preferably a plastic injection molding body or a thermoplastic sleeve. The preparation process of the plastic injection molding body is complicated and the molding cost is relatively high. However, the durability and sealing are better and it is suitable for high dust and high humidity environments. Compared with the plastic injection molding body, the preparation process of the thermoplastic sleeve is extremely simple. It is installed on the joint of the connector (including the N-type male connector 3) and the coaxial cable 1, and then it can be heated with a hot air gun to shrink it. However, the durability and sealing are slightly poor.

[0030] It should be noted that in this embodiment, both ends of the coaxial cable 1 are selected as male designs. In actual applications, we need to select the appropriate type of connector according to specific needs and scenarios. For example, in a scenario where a cable jumper needs to be connected quickly and conveniently, an N-type male connector 3 may be more suitable; when a more stable and reliable connection is required, a female connector may be more ideal. In addition, we also need to consider factors such as the interface type, transmission distance, and transmission rate of the cable jumper to ensure that the appropriate connector type is selected to meet actual needs.

[0031] like Figure 2 As shown in the figure, it is divided into four layers from the inside to the outside, namely: a center conductor 11 (single solid wire or multi-strand twisted wire), an insulating layer 12, an outer conductor 13 and a protective sheath 14. In the process of transmitting analog signals and digital signals, the center conductor 11 and the outer conductor 13 form a current loop. The shielding characteristic is an important parameter to measure the anti-interference ability of the coaxial cable 1, and it is also an important parameter to measure the anti-leakage of the coaxial cable 1. Poor shielding will affect the quality of the signal. The shielding performance is mainly determined by the structure of the outer conductor 13.

[0032] like Figure 3 , 4As shown in , 5, it can be known that the N-type male connector 3 is mainly composed of a screw sleeve 31, a conductive shell 32, a retaining spring 33, an insulator 34, a pin 35 and a tightening sleeve 36. With the central axis of the pin 35 as a reference, the insulator 34, the conductive shell 32 and the screw sleeve 31 are concentrically sleeved in sequence from the inside to the outside. The conductive shell 32 circumferentially wraps the outer conductor 13 and is electrically connected to the outer conductor 13 by soldering. After assembly, under the action of the elastic force and the clamping force generated by the retaining spring 33, the screw sleeve 31 is free from axial movement relative to the conductive shell 32. The tightening sleeve 36 is inserted into the pin 35, and it is used as a connection transition between the pin 35 and the center conductor 11. The pin 35 is formed with an insertion cavity for accommodating the tightening sleeve 36. As the tightening sleeve 36 penetrates deeper into the plug pin 35, it automatically undergoes radial contraction deformation due to the circumferential squeezing force from the side wall of the insertion cavity, and the center conductor 11 is clamped. At the same time, the conductive shell 32 circumferentially wraps around the outer conductor 13 and is electrically connected to the outer conductor 12 by soldering.

[0033] By adopting the above technical solution, on the one hand, the difficulty of operation during docking and assembly between the N-type male connector 3 and the coaxial cable 1 can be effectively reduced, and no professional tools and equipment are required for auxiliary production, which saves time and effort and is beneficial to the control of the overall construction cost; on the other hand, when the N-type male connector 3 is to be dismantled, it is only necessary to use a heating gun to release the soldering fixed connection between its conductive shell 32 and the outer conductor 13 of the coaxial cable 1, and then drag the N-type male connector 3 axially, so that the tightening sleeve 36 can be smoothly removed from the insertion cavity of the pin 35, and the tightening sleeve 36 returns to its original state due to the loss of the circumferential restraining force, thereby being able to relax the circumferential hold on the center conductor 11. In this way, not only the construction convenience can be greatly improved, but also the structural integrity and functional integrity of the N-type male connector 3 after being dismantled are not damaged, which is beneficial to the realization of the design purpose of secondary reuse.

[0034] It should also be noted that, thanks to the application of the self-tightening technology of the tightening sleeve, not only the molded coaxial cable jumper has excellent power transmission performance, but also effectively avoids the occurrence of poor contact between the center conductor and the pin caused by the defects of the traditional soldering construction process.

[0035] It is known that, according to different specific molding processes, the outer conductor 13 can be divided into the following types, specifically: single braided layer, double braided layer, triple braided layer, winding + braiding and solid shielding. In this embodiment, under the premise of taking into account the excellent shielding of the coaxial cable jumper, in order to enhance the soldering connection strength between the conductive shell 32 and the outer conductor 13, the outer conductor 13 is preferably a solid shielding structure, that is, the shielding body is a copper strip or an aluminum strip, and a spiral or annular tin-containing groove 131 is formed along its circumferential side wall.

[0036] As a further refinement of the above technical solution, Figure 6 , 7 As shown in the figure, the tightening sleeve 36 is in the shape of a semi-closed cylinder, and an open groove 361 and a plurality of annular interference protrusions 362 are formed thereon at the same time. The open groove 361 extends along the length direction of the tightening sleeve 36 and runs through the entire length. The annular interference protrusions 362 are formed by pressing the circumferential outer wall mold of the tightening sleeve 36, and the number of the annular interference protrusions 362 is set to be multiple, and are arranged in a linear array along the length direction of the tightening sleeve 36. In the process of the tightening sleeve 36 penetrating into the insertion cavity, the annular interference protrusions 362 are forcibly squeezed into the insertion cavity, and the slot width of the open groove 361 is reduced, which means that the tightening sleeve 36 automatically undergoes radial contraction deformation, and the center conductor 11 is tightly held.

[0037] Furthermore, by Figure 6 , 7 It can also be clearly seen from the figure that a process groove 363 is formed on the tension sleeve 36. The process groove 363 is formed on the circumferential inner wall of the tension sleeve 36 by removing material, and is arranged opposite to the above-mentioned opening groove 361. In this way, thanks to the opening of the process groove 363, the overall structural toughness of the tension sleeve 36 is not significantly affected, however, its local structural strength is significantly weakened, and when subjected to the circumferential extrusion force, it is more likely to undergo radial contraction deformation, thereby achieving stable holding of the center conductor 11.

[0038] It is known that according to common knowledge, the depth of the process groove 363 has a crucial influence on the actual application effect of the tension sleeve 36. In view of this, after long-term practical experience, assuming that the wall thickness of the tension sleeve 36 is t1 and the depth of the open groove is t2, then 2 / 5t1≤t2≤3 / 5t1 is the optimal choice.

[0039] Furthermore, in order to take into account both the smooth penetration of the tightening sleeve 36 into the insertion cavity and the stable holding of the center conductor 11 by the tightening sleeve 36 in the tightened state, as a further optimization of the above technical solution, the outer diameters of the plurality of sequentially arranged annular interference protrusions 362 show a gradually decreasing trend (not shown in the figure) along the insertion direction of the tightening sleeve 36. In this way, thanks to the smaller outer diameter of the annular interference protrusion 362 at the front end, the tightening sleeve 36 is easier to be introduced into the insertion cavity, and as the introduction depth increases, the outer diameter of the subsequent introduced annular interference protrusion 362 increases accordingly, so that the tightening sleeve 36 has a larger shrinkage deformation rate, so as to achieve a stable holding of the center conductor 11.

[0040] Here, the following points need to be explained:

[0041] 1) The tightening sleeve 36 has the function of tightening and re-inserting, and its material can be selected from metal materials such as tin bronze or beryllium bronze or other materials with high toughness. Of course, depending on the specific application scenario, the tightening sleeve 36 can also be selected from copper metal material, and silver is plated on its surface, which can not only increase its surface finish, but also help improve corrosion resistance and wear resistance;

[0042] 2) The conductive housing 32 and the pin 35 are preferably made of antimagnetic brass to ensure that the coaxial cable jumper has good signal transmission performance; of course, a coating (copper, silver or ternary alloy) may be formed on the outer surface of the conductive housing 32 to increase its surface finish, and to improve the electrical performance and corrosion resistance of the coaxial cable jumper to a certain extent;

[0043] 3) The insulator 34 supports and guides the center conductor 11 and is made of an insulating material with a relatively stable dielectric constant. The material may preferably be polystyrene, polytetrafluoroethylene, POM or the like having good structural strength and excellent electrical insulation.

[0044] Figure 8 , Fig. 9 The three-dimensional schematic diagrams of another structural form of the tightening sleeve in the N-type male connector disclosed in the present invention are respectively shown. It can be seen that the tightening sleeve 36 also presents a semi-sealed cylindrical shape, and multiple open grooves 361 and annular interference protrusions 362 are formed on it at the same time. Multiple open grooves 36 are evenly distributed circumferentially around the central axis of the tightening sleeve 36, and a single open groove 36 extends along the length direction of the tightening sleeve 36 until it reaches the sealing wall. The annular interference protrusion 362 is also formed by pressing the circumferential outer wall mold of the tightening sleeve 36, and multiple annular interference protrusions 362 are arranged in a linear array along the length direction of the tightening sleeve 36. Compared with the tightening sleeve 36 of the first structural design form disclosed above, it has better shrinking deformation ability when subjected to circumferential extrusion force, a larger shrinking deformation rate, and the deformation amount of each region tends to be consistent, which is more conducive to achieving stable holding of the center conductor 11.

[0045] Finally, it is necessary to explain that the present invention introduces the N-type male connector which is commonly used in the industry. The DIN male connector, 4310 type connector, SMA type connector, etc. can all be designed with reference to the above concept.

[0046] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An N-type male connector, characterized in that: It comprises a screw sleeve, a conductive shell, a retaining spring, an insulator, a plug pin and a tightening sleeve; with the central axis of the plug pin as a reference, the insulator, the conductive shell and the screw sleeve are concentrically sleeved in sequence from the inside to the outside; the conductive shell circumferentially wraps the outer conductor of the coaxial cable and is connected and fixed; after assembly, under the action of the elastic force and the clamping force generated by the retaining spring, the screw sleeve is free from axial movement relative to the conductive shell; the tightening sleeve is inserted into the plug pin and is used as a connection transition between the plug pin and the central conductor of the coaxial cable; the plug pin is formed with an insertion cavity for accommodating the tightening sleeve; When the tightening sleeve goes deeper into the pin, it automatically contracts and deforms radially due to the circumferential squeezing force from the side wall of the insertion cavity, so that the center conductor of the coaxial cable is tightly held.

2. The N-type male connector according to claim 1, characterized in that: The tightening sleeve is in the shape of a semi-closed cylinder, and is formed with an open groove and an annular interference protrusion at the same time; the number of the open groove is at least 1, and it extends along the length direction of the tightening sleeve; the annular interference protrusion is formed by pressing the circumferential outer side wall mold of the tightening sleeve, and the number of the annular interference protrusion is set to be multiple, and is arranged in a linear array along the length direction of the tightening sleeve; in the process of the tightening sleeve penetrating into the insertion cavity, the annular interference protrusion is forced into the insertion cavity, and the groove width of the open groove is reduced.

3. The N-type male connector according to claim 2, characterized in that: When the number of the opening grooves is only 1, a process groove is formed on the tightening sleeve; the process groove is formed on the circumferential inner side wall of the tightening sleeve by removing material, and is arranged opposite to the opening groove.

4. The N-type male connector according to claim 3, characterized in that: The wall thickness of the tightening sleeve is t1, and the depth of the process sink is t2, so 2 / 5t1≤t2≤3 / 5t1.

5. The N-type male connector according to claim 3, characterized in that: Along the insertion direction of the tightening sleeve, the outer diameters of the plurality of annular interference protrusions arranged in sequence show a gradually decreasing trend.

6. The N-type male connector according to claim 1, characterized in that: The material of the tightening sleeve is tin bronze or beryllium bronze.

7. The N-type male connector according to claim 1, characterized in that: After the conductive shell is put into place relative to the outer conductor of the coaxial cable, the two are fixedly connected by soldering.

8. A coaxial cable jumper, comprising a coaxial cable, a protective sleeve and at least one N-type male connector as described in any one of claims 1 to 7; the end of the N-type male connector away from the coaxial cable is an open end; after the N-type male connector and the coaxial cable are connected, the protective sleeve is used to seal and protect the joint formed between the two.

9. The coaxial cable jumper according to claim 8, characterized in that: The protective sleeve is a plastic injection-molded body.

10. The coaxial cable jumper according to claim 8, characterized in that: The protective sleeve is a thermoplastic sleeve.

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