Contact and intermediate conductor thereofTechnical Field
The invention relates to the technical field of connectors, in particular to a contact and an intermediate conductor thereof.
Background
The contact is an important component of the connector, the overall structure of the existing non-resistance MILs-STD-1553B contact is shown in fig. 1, and the contact is composed of an inner conductor 101, a left middle conductor 103, a right middle conductor 108, a left outer conductor 105, a right outer conductor 106, a left inner insulator 104, a right inner insulator 107, a left outer insulator 102 and a right outer insulator 109, wherein the left inner insulator 104 and the right inner insulator 107 are isolated between the inner conductor 101 and the middle conductor, the left outer insulator 102 and the right outer insulator 109 are isolated between the middle conductor and the outer conductor, and the transmission of electric signals is mainly completed by the inner conductor and the middle conductor. The middle conductor consists of a left middle conductor 103 and a right middle conductor 108, the right end of the left middle conductor 103 is a pin end, the left end of the right middle conductor 108 is a jack end, and the pin end and the jack end are oppositely inserted to form electric connection.
For a particular application, a resistor of a certain resistance value, called "shunt resistor", needs to be connected in parallel between the inner conductor and the intermediate conductor, and the external dimensions need not be changed, and the outer conductor has not to be "windowed". In the prior art, the volume limitation is mainly considered, the chip resistor 110 is selected, and as shown in fig. 2-3, two lead ends of the chip resistor 110 are welded on the left middle conductor 103 and the inner conductor 101 respectively, that is, are connected in parallel between the middle conductor and the inner conductor, so as to realize a bypass function. Because the middle conductor is switched by two parts, the internal contact pin end and the jack end are oppositely inserted, and one switching is introduced, the structure is slightly complex, and the reliability is slightly low. And because the chip resistor is very small, when two lead ends of the chip resistor are respectively welded with the middle conductor and the inner conductor, the chip resistor is difficult to assemble, and the short circuit of the two lead ends is very easy to cause. In addition, when the middle conductor and the inner conductor are used in opposite insertion, a certain amount of axial movement occurs under the action of external force, the strength of the chip resistor is low, and the chip resistor is easily cracked to be damaged or the welding spots are easily separated. Even if the fixation is carried out by supplementary glue, the fixation cannot be completely avoided.
Disclosure of Invention
The invention aims to provide an intermediate conductor of a contact so as to solve the problems that the intermediate conductor of the traditional MIL-STD-1553B contact is realized by switching two parts, the structure is complex and the reliability is low, and also aims to provide the contact so as to solve the problems that the intermediate conductor of the traditional MIL-STD-1553B contact is complex in structure and low in reliability, and the signal transmission reliability of the contact is reduced.
The intermediate conductor of the contact adopts the following technical scheme:
The middle conductor of the contact comprises a tubular main body, two ends of the tubular main body are respectively extended with an inserting contact section, an inner cavity of the tubular main body is an installation inner cavity for installing an inner conductor and an inner insulation, a resistor avoidance window for avoiding a lead-type bypass resistor so that one end lead of the resistor can extend into the installation inner cavity and be connected with the inner conductor is formed in the middle pipe wall of the tubular main body, and a port edge of the resistor avoidance window is provided with a lead connection structure for being connected with the other end lead of the lead-type bypass resistor in the axial direction.
Further, the lead connecting structure is a wire containing welding groove which is formed at the edge of the resistor avoiding window and is used for enabling the other end of the lead bypass resistor to extend into and be welded.
Further, an axial stop inner boss for axially stopping the inner insulation is arranged on one end cavity wall of the installation cavity, and a welding hole for welding the inner insulation fixing ring is formed on the other end cavity wall of the installation cavity.
Further, the outer peripheral surface of the tubular main body is provided with an axial stop step surface for axially stopping and limiting external insulation.
The contact element has the beneficial effects that the intermediate conductor of the contact element is created for the development of the invention. The middle conductor comprises a tubular main body, two ends of the tubular main body are respectively extended with an inserting contact section, an inner cavity of the tubular main body is used for installing an inner conductor and inner insulation, a resistor avoidance window is formed in the middle pipe wall of the tubular main body, a lead-type bypass resistor can be avoided and one end lead of the lead-type bypass resistor is extended into the inner cavity of the tubular main body to be connected with the inner conductor, the other end lead of the lead-type bypass resistor can be directly connected to a lead connection structure at the edge of the resistor avoidance window, the middle conductor is not in a switching mode, the structure is simpler, the reliability is improved, one end lead of the lead-type bypass resistor can extend into the inner cavity of the middle conductor through the resistor avoidance window to be connected with the inner conductor in a welding mode, the other end lead is located outside the middle conductor and is directly connected to the edge of the resistor avoidance window of the middle conductor, and the two lead ends are far apart, so that welding assembly is more convenient, and the short circuit condition of the two lead ends can be effectively avoided.
The contact piece adopts the following technical scheme:
The contact comprises a lead-type bypass resistor and an inner conductor, an inner insulator, a middle conductor, an outer insulator and an outer conductor which are radially arranged from inside to outside in sequence, wherein the middle conductor comprises a tubular main body, two ends of the tubular main body are respectively extended with an inserting contact section, a resistor avoiding window for avoiding the lead-type bypass resistor is formed in the middle pipe wall of the tubular main body and the inner insulator, the lead-type bypass resistor is axially arranged at the resistor avoiding window, one end of the lead is connected with the middle conductor, and the other end of the lead is connected with the inner conductor.
Further, a wire containing welding groove is formed in the opening edge of the resistor avoidance window on the middle pipe wall of the tubular main body, one end of a lead wire type bypass resistor is connected with the wire containing welding groove in a penetrating and welding mode, a wire inserting welding groove with an opening facing outwards in the radial direction is formed in the inner conductor, and the other end of the lead wire type bypass resistor is connected with the wire containing welding groove in a penetrating and welding mode.
Further, the internal insulation is of a sleeve-shaped structure of an axial split butt-buckle, the internal conductor is butt-buckled and the axial limiting of the internal conductor is realized, the inner cavity of the tubular main body is an installation inner cavity for installing the internal conductor and the internal insulation, one end of the installation inner cavity is provided with an axial stop inner boss so as to axially stop one end of the internal insulation, and the other end of the installation inner cavity is provided with an internal insulation fixing ring so as to axially stop the other end of the internal insulation, and the internal insulation fixing ring is fixedly connected with the tubular main body.
Further, an avoidance sink is arranged on the inner conductor at a position corresponding to the resistor avoidance window so as to provide an accommodating space for accommodating the lead-type bypass resistor.
Further, an avoidance cavity is formed in the outer insulator at a position corresponding to the resistor avoidance window, so that an accommodating space for accommodating the lead-type bypass resistor is provided.
Further, the outer insulation is of a sleeve-shaped structure of axial split buckling, the middle conductor is buckled inside, and the outer peripheral surface of the middle conductor is provided with an axial stop step surface so as to perform axial stop limit on the outer insulation.
The contact element has the beneficial effects that the contact element is created for pioneering the invention. The middle conductor is a part, the middle conductor and the inner insulator are both provided with a resistor avoidance window, the lead-type bypass resistor is axially arranged at the resistor avoidance window, one end of the lead is connected with the middle conductor, the other end of the lead is connected with the inner conductor, the middle conductor does not adopt a switching mode, the structure is simpler, the signal transmission reliability is improved, the lead-type bypass resistor is axially arranged along the middle conductor, one end of the lead is positioned outside the middle conductor and connected with the middle conductor, the other end of the lead extends into an inner cavity of the middle conductor through the resistor avoidance window and is connected with the inner conductor, and the two lead ends are far away from each other, so that the welding assembly is more convenient, and the short circuit condition of the two lead ends can be effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a conventional non-resistive MIL-STD-1553B contact;
fig. 2 is a schematic structural diagram of an MIL-STD-1553B contact with a built-in chip resistor;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a schematic diagram of a lead-type shunt resistor in an embodiment of a contact of the present invention;
FIG. 5 is a schematic view of a first view of an intermediate conductor in an embodiment of a contact of the present invention;
FIG. 6 is a schematic diagram of a second view of an intermediate conductor in an embodiment of a contact of the present invention;
FIG. 7 is a schematic diagram of a third view of an intermediate conductor in an embodiment of a contact of the present invention;
FIG. 8 is a perspective view of an embodiment of a contact of the present invention;
FIG. 9 is a front view of an embodiment of a contact of the present invention;
FIG. 10 is a cross-sectional view taken at A-A of FIG. 9;
FIG. 11 is a cross-sectional view taken at B-B of FIG. 10;
FIG. 12 is a cross-sectional view taken at C-C of FIG. 10;
FIG. 13 is a schematic view of the structure of the inner conductor, inner insulation, and intermediate conductor assembled together;
FIG. 14 is a cross-sectional view of the inner conductor, inner insulation, and intermediate conductor assembled together;
FIG. 15 is a schematic diagram of the assembly of the lead bypass resistor with the intermediate conductor, the inner insulation, and the inner conductor;
FIG. 16 is a cross-sectional view of a lead bypass resistor assembled with an intermediate conductor, an inner insulation, and an inner conductor;
In fig. 1-3, 101, inner conductor, 102, left outer insulator, 103, left middle conductor, 104, left inner insulator, 105, left outer conductor, 106, right outer conductor, 107, right inner insulator, 108, right middle conductor, 109, right outer insulator, 110, chip resistor;
In the figure 4-16, 1, a left outer conductor, 2, a left outer insulation, 3, a middle conductor, 3-1, a tubular main body, 3-2, a plug contact section, 3-3, a split groove, 3-4, a middle pipe wall, 3-5, a wire holding welding groove, 3-6, an axial stop inner boss, 4, a left inner insulation, 5, an inner conductor, 5-1, a wire inserting welding groove, 5-2, an avoidance sinking groove, 6, a lead type bypass resistor, 6-1, a resistor matrix, 6-2, a lead end, 7, a right inner insulation, 8, an inner insulation fixing ring, 8-1, a stop boss, 9, a right outer insulation, 10, a right outer conductor, 11, a welding hole, 12, a resistor avoidance window, 13 and an avoidance cavity.
Detailed Description
The middle conductor of the MIL-STD-1553B contact element of the existing built-in chip resistor is realized by switching two parts, and because of the fact that one-time switching is introduced, the structure is complex, the transmission reliability is reduced, and when two lead ends of the chip resistor are welded with the middle conductor and the inner conductor respectively, the assembly is difficult, and the short circuit of the two lead ends is easy to cause. The invention provides a contact, in particular to an MIL-STD-1553B contact, which has the basic inventive concept that a middle conductor is a part, a switching mode is not adopted any more, the structure is simplified, the transmission reliability is improved, the middle conductor is provided with a resistance avoiding window for avoiding a lead-type bypass resistor, one end lead of the lead-type bypass resistor is connected with the middle conductor, the other end lead can extend into an inner cavity of the middle conductor through the resistance avoiding window to be welded and connected with an inner conductor, and the two lead ends are far apart, so that the welding assembly is more convenient, and the short circuit condition of the two lead ends is effectively avoided.
Based on the above inventive concept, embodiments of the present invention are described in detail below.
Embodiments of the contact of the present invention:
As shown in fig. 8-10, the contact of the present invention comprises a lead-type shunt resistor 6 and an inner conductor 5, an inner insulator, an intermediate conductor 3, an outer insulator, and an outer conductor which are arranged radially from inside to outside.
The structure of the lead-type shunt resistor 6 is shown in fig. 4, and is a common lead-type metal film resistor, which comprises a resistor substrate 6-1 and two lead ends 6-2 arranged at two axial ends of the resistor substrate 6-1, wherein one lead end 6-2 is cut and reserved for a certain length, and the other lead end 6-2 is cut and reserved for a certain length and bent to 90 degrees.
The structure of the middle conductor 3 is shown in fig. 5-7, and comprises a tubular main body 3-1, two ends of the tubular main body 3-1 are respectively extended with a splicing contact section 3-2, the splicing contact section 3-2 is provided with a plurality of splitting grooves 3-3 which are circumferentially arranged at intervals and axially extend, the inner cavity of the tubular main body 3-1 is an installation inner cavity for installing the inner conductor 5 and the inner insulation, a resistance avoidance window 12 for avoiding the lead-type bypass resistor 6 is formed in the middle pipe wall 3-4 of the tubular main body 3-1, and one end lead of the lead-type bypass resistor 6 can extend into the installation inner cavity through the resistance avoidance window 12 and be connected with the inner conductor 5. In the axial direction, a wire holding welding groove 3-5 is formed at the edge of one port of the resistor avoiding window 12 and is used for extending and welding the other end of the lead-type bypass resistor 6, so that the connection with the intermediate conductor 3 is realized, and the wire holding welding groove 3-5 forms a lead connecting structure for connecting with the other end of the lead-type bypass resistor 6. The wire holding welding groove 3-5 is formed at the edge of one port of the resistor avoiding window 12, the wire holding welding groove 3-5 is an outward opening groove with the notch outwards, the wire holding welding of the wire holding bypass resistor 6 can be easier, the operation is more convenient, and the welding is reliable. The pipe wall of the tubular main body 3-1 is also provided with a plurality of welding holes 11, the plurality of welding holes 11 are uniformly distributed at intervals along the circumferential direction, the welding holes 11 are used for welding the inner insulation fixing ring 8, and the inner insulation fixing ring 8 is fixedly arranged in the inner cavity of the tubular main body 3-1 so as to axially fix the inner insulation.
As shown in fig. 10-12, a resistor avoiding window 12 for avoiding the lead-type shunt resistor 6 is also formed on the inner insulation between the inner conductor 5 and the middle conductor 3, and one end lead of the lead-type shunt resistor 6 is connected with the inner conductor 5 through the middle conductor 3 and the resistor avoiding window 12 on the inner insulation. The inner conductor 5 is provided with a wire insertion welding groove 5-1 with a radial outward opening, one end lead of the lead-type bypass resistor 6 extends into the wire insertion welding groove 5-1 and is welded, the lead and the wire insertion welding groove 5-1 have a larger welding area in the circumferential direction, and welding is firm and reliable. The inner conductor 5 is provided with the avoidance sink 5-2 at the position corresponding to the resistor avoidance window 12 so as to provide an accommodating space for accommodating the lead-type bypass resistor 6, and the contact volume is prevented from being increased due to the fact that the lead-type bypass resistor 6 additionally occupies the inner space of the contact.
The inner insulation is of a sleeve-shaped structure of an axial split butt-joint, and comprises a left inner insulation 4 and a right inner insulation 7, wherein the left inner insulation 4 and the right inner insulation 7 are butt-jointed to butt-joint the inner conductor 5 and realize axial limiting of the inner conductor 5. The inner cavity wall of the left inner insulator 4 is provided with a limiting step surface facing to the right so as to limit the inner conductor 5 from the left side, and the inner cavity wall of the right inner insulator 7 is provided with a limiting step surface facing to the left so as to limit the inner conductor 5 from the right side, thereby realizing the axial limiting of the inner conductor 5.
The left end cavity wall of the inner cavity of the middle conductor 3 is provided with an axial stop inner boss 3-6, and the stop surface of the axial stop inner boss 3-6 faces to the right and is used for axially stopping the left inner insulator 4 from the left end. An inner insulating fixing ring 8 is fixedly arranged at the right end in the inner cavity of the middle conductor 3, a welding hole 11 is arranged on the right end pipe wall of the middle conductor 3, and the inner insulating fixing ring 8 is fixedly welded on the right end cavity wall of the inner cavity of the middle conductor 3 through the welding hole 11. The inner cavity wall of the inner insulation fixing ring 8 is provided with a stop boss 8-1, and the stop surface of the stop boss 8-1 faces to the left and is used for axially stopping the right inner insulation 7 from the right end. The inner insulation is axially blocked by the axial blocking inner boss 3-6 on the left end cavity wall of the inner cavity of the middle conductor 3 from the left end, the inner insulation fixing ring 8 is axially blocked by the inner insulation from the right end, and the inner insulation fixing ring 8 is welded with the middle conductor 3, so that the positions of the inner conductor 5, the inner insulation and all parts of the middle conductor 3 are firmly fixed, and no movement occurs.
The outer insulation is isolated between the outer conductor and the middle conductor 3, and an avoidance cavity 13 is arranged at the position corresponding to the resistance avoidance window 12 on the outer insulation so as to provide an accommodating space for accommodating the lead-type bypass resistor 6, and the problem that the lead-type bypass resistor 6 additionally occupies the inner space of the contact to cause the volume increase of the contact is avoided. The outer insulation is a sleeve-shaped structure of an axial split butt-joint, and comprises a left outer insulation 2 and a right outer insulation 9, wherein the left outer insulation 2 and the right outer insulation 9 are butt-jointed and the middle conductor 3 is butt-jointed. The outer diameter of the middle pipe section of the middle conductor 3 is larger than that of the two end pipe sections, and the transition connection of the middle pipe section and the two end pipe sections respectively form a left-facing axial stop step surface and a right-facing axial stop step surface, wherein the left-facing axial stop step surface is used for axially limiting the left outer insulator 2, and the right-facing axial stop step surface is used for axially limiting the right outer insulator 9.
The outer conductor is of a sleeve-shaped structure of an axial split butt-joint, and comprises a left outer conductor 1 and a right outer conductor 10, wherein the left outer conductor 1 and the right outer conductor 10 are butt-jointed and are butt-jointed with the outer insulation. The left outer conductor 1is buckled outside the left outer insulation 2, and the inner cavity wall of the left outer insulation 2 is provided with a right-facing step surface so as to axially limit the left outer insulation 2 from the left side, and the step surface is matched with the left-facing axial stop step surface on the middle conductor 3, so that the axial limit of the left outer insulation 2 in the outer conductor is realized. The right outer conductor 10 is buckled outside the right outer insulation 9, and the left end of the right outer insulation 9 stretches into the right end inner cavity of the left outer conductor 1, the left end of the right outer conductor 10 is provided with a continuous step surface facing left so as to axially limit the right outer insulation 9 from the right side, and the continuous step surface is matched with the axial stop step surface facing right on the middle conductor 3 so as to axially limit the right outer insulation 9 in the outer conductor. The right outer conductor 10 is inserted into the right end of the left outer conductor 1, and four welding holes 11 are provided on the left outer conductor 1 at intervals in the circumferential direction to weld the left outer conductor 1 and the right outer conductor 10 together.
In the assembly of the contact, in the first step, as shown in fig. 13-14, the inner conductor 5, the left inner insulator 4, the right inner insulator 7, the inner insulator fixing ring 8 and the middle conductor 3 are assembled together, and the inner insulator fixing ring 8 and the middle conductor 3 are welded and fixed, so that the assembly and the fixation of the parts are realized, the position of each part is fixed firmly, and the movement cannot occur.
And secondly, as shown in fig. 15-16, the leads at the two ends of the lead-type bypass resistor 6 are respectively welded on the middle conductor 3 and the inner conductor 5, so that the operation is convenient, the welding is easy, and the welding is firm and reliable.
Third, as shown in fig. 10, the left outer conductor 1, the left outer insulator 2, the right outer insulator 9, and the right outer conductor 10 are combined, and the left outer conductor 1 and the right outer conductor 10 are welded together, so that the welding is firm and reliable, and the assembly of all parts is completed.
The middle conductor 3 of the contact is an integrated structure formed by one part, a switching mode is not adopted any more, the structure is simpler, and the transmission reliability is improved. Be equipped with resistance on the middle conductor 3 and dodge window 12, lead wire formula bypass resistance 6 is dodged mouthful department at the resistance and is arranged along the axial, and its one end lead wire and middle conductor 3 welded connection, the other end lead wire can stretch into in the inner chamber of middle conductor 3 through resistance dodge window 12 with inner conductor 5 welded connection, and both ends lead wire welding is easy, and the distance is farther for welding assembly is more convenient, and can effectively avoid two lead wire end 6-2 short circuit condition. In addition, the positions of all parts of the contact are fixed firmly, and the middle conductor 3 and the inner conductor 5 cannot axially float when being used in opposite insertion, so that the welding spots of the lead-type bypass resistor 6, the middle conductor 3 and the inner conductor 5 are not easy to separate, and the stability and reliability of the bypass function are ensured.
Of course, the contact of the present invention is not limited to the implementation in the above examples.
For example, in another embodiment, a wire insertion welding hole extending in the axial direction is formed at the edge of one end of the resistor avoidance window of the intermediate conductor, and one end of the wire insertion bypass resistor is inserted into and welded to form a wire connection structure of the intermediate conductor, or one end of the wire insertion bypass resistor is directly welded at the edge of the resistor avoidance window. Similarly, the inner conductor may be directly soldered with the other end lead of the lead-type bypass resistor on the outer side surface of the inner conductor without providing a wire insertion soldering groove.
For example, in another embodiment, an inner insulating fixing ring is welded and fixed to each of the left and right ends of the installation cavity of the intermediate conductor, so that the inner insulation is axially stopped from the two ends, and the intermediate conductor and the inner conductor are prevented from axially moving.
For example, in another embodiment, no recess is formed in the inner conductor, so that more space is required for installing the lead-type shunt resistor, and the overall size of the contact is slightly increased.
For example, in another embodiment, no relief cavity is provided in the outer insulator for accommodating the lead bypass resistor, and the radial dimension of the outer insulator may be increased and the overall contact size may be slightly increased to accommodate the lead bypass resistor.
For example, in another embodiment, the outer peripheral surface of the intermediate conductor is not provided with an axial stop step surface, but a stop ring is fixedly sleeved outside the intermediate conductor, and the outer insulation is axially stopped and limited through the stop ring.
The invention also provides an embodiment of the intermediate conductor of the contact, and the specific structure of the embodiment of the intermediate conductor is the same as that of the intermediate conductor in the embodiment of the contact of the invention, and is not repeated here.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.