A cable assembly with a sealed joint

Abstract

The utility model discloses a cable assembly with sealed joint, include: power connection end four core plug, igniter tube connecting end and be connected between power connection end four core plug and igniter tube connecting end at least one strip cable, igniter tube connecting end includes glass sintering four core joint, single core pin connector and single core jack connector, the metal shell of glass sintering four core joint is equipped with outer thread for with installation cavity connection installation, the welding jack contact piece is fixed with through insulating seal body in the metal shell, and the both ends of welding jack contact piece are connected with single core jack connector and strip cable electricity respectively, the utility model discloses through strip cable can realize the wiring in the flat space, and satisfy modern explosive foil initiation system miniaturization, high reliability requirement, and can effectively prevent the high temperature and high pressure gas spouts inside.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, specifically, a cable assembly with a sealed joint. Background Technology

[0002] In applications such as detonation foil initiation systems, it is necessary to reliably transmit the high-voltage, high-current pulse signal generated by the inline power supply to the impact ignition tube to ensure reliable ignition. This pulse signal is characterized by a large instantaneous current (kiloamperes) and an extremely short rise time (nanoseconds), making it very sensitive to the inductance of the transmission line. Excessive inductance will severely attenuate the pulse signal, causing the ignition tube to fail to detonate.

[0003] Traditional cable assemblies assembled from coaxial cables or discrete conductors suffer from high inductance, large size, and difficulty in wiring within flat spaces, making it difficult to meet the miniaturization and high reliability requirements of modern explosive foil initiation systems. Meanwhile, the interface between the connector and the mounting cavity needs to have good sealing performance to withstand the impact of high-temperature, high-pressure gases inside and to ensure insulation performance in low-pressure environments.

[0004] Therefore, there is an urgent need for a special cable assembly with low inductance, small size, high sealing performance, and the ability to withstand low-pressure environments. Utility Model Content

[0005] To address the aforementioned technical problems, the present invention aims to provide a cable assembly with a sealed connector, which efficiently and reliably transmits the high-voltage pulse current output from the in-line power supply to the impact plate ignition tube, and features low inductance, small size, high sealing performance, and excellent adaptability to low-pressure environments.

[0006] The present invention solves the above problems through the following technical solution:

[0007] A cable assembly with a sealed connector includes: a four-pin plug for power connection, a ignition tube connector, and at least one ribbon cable connected between the four-pin plug for power connection and the ignition tube connector.

[0008] The ignition tube connection includes a glass-sintered four-core connector, at least one single-core pin connector, and at least one single-core jack connector. The metal shell of the glass-sintered four-core connector is provided with an external thread and a sealing ring mounting structure for threaded connection and surface sealing with the mounting cavity. Multiple welded jack contacts are fixed inside the metal shell of the glass-sintered four-core connector through an insulating seal. The wires of the single-core pin connector and the single-core jack connector are electrically connected to one end of the welded jack contacts, and the other end of the welded jack contacts is electrically connected to a ribbon cable.

[0009] As a further improvement, the internal cavity of the four-pin plug of the power connection terminal and / or the tail cavity of the glass sintered four-pin connector are both filled with sealant.

[0010] As a further improvement, the conductor of the ribbon cable is a metal foil, and the insulation layer is a polyimide film.

[0011] As a further improvement, the wires of the single-core pin connector and the single-core socket connector are twisted before being connected to the glass-sintered four-core connector.

[0012] As a further improvement, the four-pin plug for power connection includes: a dust cover, a plug housing, a mounting plate, and sockets. The plug housing has an internal cavity, and the mounting plate is disposed within the internal cavity. The mounting plate has several sockets disposed within the mounting plate. One end of the socket is welded to the ribbon cable, and the other end of the socket is fitted with a sleeve. A dust cover is disposed on the end of the plug housing away from the ribbon cable.

[0013] As a further improvement, the sleeve is made of stainless steel, and the socket and the stainless steel sleeve are transitionally fitted and crimped together.

[0014] As a further improvement, the four-pin plug of the power connection terminal is also provided with a retaining ring and a connecting ring. The connecting ring is sleeved and installed outside the plug housing. A groove is also formed on the outside of the plug housing to accommodate the retaining ring, so as to seal the plug housing and the connecting ring through the retaining ring. An opening is formed between the plug housing and the connecting ring on the side away from the ribbon cable, and a dust cover is inserted and installed in the opening.

[0015] As a further improvement, the plug housing and the connecting ring are both made of stainless steel; and / or the socket is made of copper alloy and plated with gold; and / or the mounting plate is made of PPS material.

[0016] As a further improvement, the insulating sealing body of the glass sintered four-core connector is a glass sintered body, and the welding socket contact is an iron-nickel alloy with a gold-plated surface.

[0017] As a further improvement, the ribbon cable is configured as two cables of different lengths; and each ribbon cable has a tin end at both ends, which is used to weld to the welding socket contacts of the four-core plug of the power connection terminal and the glass sintered four-core connector, respectively. After welding, the cables are potted with heat-resistant epoxy resin and then cured.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] (1) The four-core plug of the power connection end of this utility model is connected to the power socket, and the single-core pin connector and the single-core socket connector are connected to the ignition tube; and the four-core plug of the power connection end leads out a glass sintered four-core connector through a ribbon cable, and is connected to the single-core pin connector and the single-core socket connector through the glass sintered four-core connector. The glass sintered four-core connector is sealed to the cavity. The cavity opening size is small, which effectively prevents the internal high-temperature and high-pressure gas from being ejected. The ribbon cable has a small thickness and occupies little radial space, which can realize wiring in a flat space and meet the requirements of miniaturization and high reliability of modern explosive foil detonation systems.

[0020] (2) The ribbon cable of this utility model is equipped with a glass-sintered four-core connector at the tail end. During assembly, heat-resistant epoxy resin is potted on both sides. The external thread is connected to the threaded hole of the cavity and fits into the cavity through a sealing ring to seal the high-temperature and high-pressure gas inside the cavity and ensure normal operation inside the chamber. The single-core pin connector and the single-core socket connector are small in size and can pass through the cavity opening first. After the glass-sintered four-core connector is screwed into the cavity, the single-core connector is connected to the firing tube end inside the cavity, which is convenient to operate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a cable assembly with a sealed joint according to the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the four-pin plug for the power connection terminal of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the ribbon cable of this utility model;

[0024] Figure 4 This is a cross-sectional view of the strip cable of this utility model, showing the distribution of each layer.

[0025] Figure 5 This is a schematic diagram of the structure of the glass sintering four-core connector of this utility model;

[0026] Figure 6 This is a short-circuit test current curve of the cable assembly of this utility model.

[0027] Figure label:

[0028] 1. Power connector four-pin plug; 101. Dust cover; 102. Plug housing; 103. Mounting plate; 104. Sleeve; 105. Socket; 106. Snap ring; 107. Connecting ring; 2. Ribbon cable; 201. Metal foil; 202. Polyimide film; 203. Tin surface; 3. Glass sintered four-pin connector; 301. Metal shell; 302. Insulating seal; 303. Welded socket contact; 4. Single-pin connector; 5. Single-socket connector. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example:

[0031] Combined with appendix Figure 1-5 As shown, a cable assembly with a sealed connector includes: a four-core plug 1 for power connection, a ignition tube connection, and at least one ribbon cable 2 connected between the four-core plug 1 for power connection and the ignition tube connection.

[0032] The ignition tube connection includes a glass-sintered four-core connector 3, at least one single-core pin connector 4, and at least one single-core socket connector 5. The metal shell of the glass-sintered four-core connector 3 is provided with an external thread and a sealing ring mounting structure to form a sealed connector for threaded connection and surface sealing with the mounting cavity. Multiple welded socket contacts are fixed inside the metal shell of the glass-sintered four-core connector 3 through an insulating seal. The wires of the single-core pin connector 4 and the single-core socket connector 5 are electrically connected to one end of the welded socket contacts, and the other end of the welded socket contacts is electrically connected to the ribbon cable 2.

[0033] The internal cavity of the four-pin plug 1 at the power connection terminal and / or the tail cavity of the glass-sintered four-pin connector 3 are filled with sealant. This sealing process not only secures the internal wires and solder joints, providing vibration and impact resistance, but more importantly, it offers excellent insulation and sealing, preventing external moisture intrusion and internal gas escape.

[0034] Furthermore, the conductor of the ribbon cable 2 is a metal foil 201, and the insulation layer is a polyimide film 202. This material combination has good conductivity, flexibility, and high temperature resistance, making it ideal for manufacturing low-inductance, high-reliability ribbon cables. The wires of the single-core pin connector 4 and the single-core jack connector 5 are twisted before being connected to the glass-sintered four-core connector 3.

[0035] Specifically, a cable assembly with a sealed connector includes: a four-pin power connector 1, an ignition tube connector, and two ribbon cables 2 connecting the four-pin power connector 1 and the ignition tube connector. The four-pin power connector is used to connect to high-voltage pulse output devices such as inline power supplies, i.e., power sockets, serving as their power input terminals. The ignition tube connector includes a glass-sintered four-pin connector 3, two single-pin connectors 4, and two single-hole connectors 5. The single-pin connectors 4 and 5 are used for direct connection to loads such as impact ignition tubes. The flat structure of the ribbon cables 2 gives them lower inductance than round conductors of the same cross-sectional area, which helps maintain the integrity of the pulse signal and a steep rise edge.

[0036] Optionally, the four-pin plug 1 for power connection includes: a dust cover 101, a plug housing 102, a mounting plate 103, a sleeve 104, a socket 105, a retaining ring 106, and a connecting ring 107. The plug housing 102 has an internal cavity, within which the mounting plate 103 is installed. The mounting plate 103 has several sockets 105. A sleeve 104 is installed on the end of the socket 105 away from the ribbon cable 2. The sleeve 104 is made of stainless steel, and the fit between the socket 105 and the stainless steel sleeve 104 is a transition fit. A sleeve assembly tool is used to press the stainless steel sleeve from the socket's mating end to the step of the socket to ensure proper assembly. The plug housing 102 has a groove for accommodating the retaining ring 106. The connecting ring 107 is fitted onto the plug housing 102, and the retaining ring 106 is positioned between the plug housing 102 and the connecting ring 107 to achieve a seal. An opening is formed between the plug housing 102 and the connecting ring 107 on the side away from the ribbon cable 2. The dust cover 101 is inserted into the opening to achieve a sealed dustproof environment for the four-pin plug 1 at the power connection end.

[0037] The plug housing 102 and connecting ring 107 of the four-pin power connector 1 are made of stainless steel, while the internal sockets are made of copper alloy and gold-plated. The insulating sealing body of the glass-sintered four-pin connector 3 is a glass-sintered body, and the internal welded socket contacts are made of iron-nickel alloy and gold-plated. The internal insulating mounting plate 103 of the four-pin power connector 1 is made of PPS material.

[0038] In this embodiment, two strip cables 2 are provided, with different lengths; preferably, the lengths are 1855mm and 1875mm respectively; the metal foil 201 is copper foil, which is made of alternating copper foil and polyimide film 202, and the outer layer is polyimide film 202; both ends are provided with tin surface 203, which is used to weld with the welding socket contact of the power connection four-core plug 1 and the glass sintered four-core connector 3 respectively, and after welding, it is potted with heat-resistant epoxy resin and then cured.

[0039] The tail end of the ribbon cable 2 is connected to a glass-sintered four-core connector 3, which is made of sintered glass. The glass-sintered four-core connector 3 includes: a metal shell 301, an insulating sealing body 302 made of glass blank, and a welded socket contact 303. The metal shell 301 has a threaded connector at the end near the single-core pin connector 4 and the single-core socket connector 5 for installation with the cavity. A tail cavity is formed inside the metal shell 301, and an insulating sealing body 302 is formed inside the tail cavity. The welded socket contact 303 is provided inside the insulating sealing body 302. During assembly, the internal cavities of the four-core plug 1 at both ends of the ribbon cable 2, i.e., the power connection end, and / or the tail cavity of the glass-sintered four-core connector 3 are filled with heat-resistant epoxy resin. The connector thread of the glass-sintered four-core connector 3 is connected to the threaded hole of the cavity. A threaded tail sealing ring can also be provided to fit against the cavity to seal the high-temperature and high-pressure gas inside the cavity and ensure normal operation inside the chamber.

[0040] A cable assembly with a sealed joint according to this utility model was tested:

[0041] I. Short-circuit test;

[0042] Typical short-circuit discharge current curves of test cable assemblies

[0043] First peak current time (rise time, Δt) ≤550ns The current at the first peak (I1) ≥1200A

[0044] The short-circuit discharge waveform of the entire cable assembly was tested. Under the condition of 0.4uF / 1700V, the typical short-circuit discharge curve is as follows: Figure 6 , Figure 6 The parameters specified in the table should meet the relevant requirements. The low inductance of the ribbon cable plays a key role in resisting pulse current attenuation.

[0045] II. Electrical performance;

[0046] 2.1 Dielectric withstand voltage;

[0047] The test shall be conducted according to Test Condition I of Test Method 3001 Dielectric Withstand Voltage in GJB1217A-2009. The device shall be able to withstand a voltage of 3000V DC / 1min between adjacent contacts and between a contact and any outer surface, without breakdown or arcing, and the leakage current shall not exceed 1mA. (Testing with voltage applied at the same terminal)

[0048] 2.2 Insulation resistance;

[0049] According to the requirements of test method 3003 in GJB1217A-2009, the insulation resistance shall be tested between two adjacent contacts and between a contact and any outer surface, and shall be greater than or equal to 5000MΩ.

[0050] 2.3 Linear resistance;

[0051] The cable assembly was tested according to method 3004 of GJB 1217A-2009, and the resistance of each channel was measured to be 100mΩ±20mΩ, which meets the product usage requirements.

[0052] III. Low air pressure requirements;

[0053] The cable assembly with the connectors properly fitted shall be tested according to Method 3001 of GJB 1217A-2009, reducing the chamber pressure to 270 Pa at a rate of 10 kPa / min and maintaining this pressure for at least 10 minutes; a test voltage of 2500 V DC shall be applied between all adjacent conductors and between the conductors and the housing, with a measurement time of 5 seconds, during which the entire assembly shall remain within the test chamber at the specified low pressure. The leakage current shall not exceed 1 mA, and there shall be no breakdown or arcing.

[0054] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A cable assembly with a sealed joint, characterized in that, include: A four-pin power connector, a ignition tube connector, and at least one ribbon cable connecting the four-pin power connector and the ignition tube connector; The ignition tube connection includes a glass-sintered four-core connector, at least one single-core pin connector, and at least one single-core jack connector. The metal shell of the glass-sintered four-core connector is provided with an external thread and a sealing ring mounting structure for threaded connection and surface sealing with the mounting cavity. Multiple welded jack contacts are fixed inside the metal shell of the glass-sintered four-core connector through an insulating seal. The wires of the single-core pin connector and the single-core jack connector are electrically connected to one end of the welded jack contacts, and the other end of the welded jack contacts is electrically connected to a ribbon cable.

2. The cable assembly with a sealed joint according to claim 1, characterized in that, The internal cavity of the four-pin plug at the power connection terminal and / or the tail cavity of the glass sintered four-pin connector are both filled with sealant.

3. The cable assembly with a sealed joint according to claim 1, characterized in that, The conductor of the ribbon cable is a metal foil, and the insulation layer is a polyimide film.

4. The cable assembly with a sealed joint according to claim 1, characterized in that, The wires of the single-core pin connector and the single-core socket connector are twisted before being connected to the glass-sintered four-core connector.

5. A cable assembly with a sealed joint according to claim 1, characterized in that, The four-pin plug for power connection includes: a dust cover, a plug housing, a mounting plate, and sockets. The plug housing has an internal cavity, and the mounting plate is installed inside the internal cavity. The mounting plate has several sockets. One end of the socket is welded to the ribbon cable, and the other end of the socket is fitted with a sleeve. The end of the plug housing away from the ribbon cable is fitted with a dust cover.

6. A cable assembly with a sealed joint according to claim 5, characterized in that, The sleeve is made of stainless steel, and the socket and the stainless steel sleeve are transitionally fitted and crimped together.

7. A cable assembly with a sealed joint according to claim 5, characterized in that, The four-pin plug for power connection is also provided with a retaining ring and a connecting ring. The connecting ring is sleeved and installed outside the plug housing. A groove is also formed on the outside of the plug housing to accommodate the retaining ring, so as to seal the plug housing and the connecting ring through the retaining ring. An opening is formed between the plug housing and the connecting ring on the side away from the ribbon cable, and a dust cover is inserted and installed in the opening.

8. A cable assembly with a sealed joint according to claim 7, characterized in that, The plug housing and the connecting ring are both made of stainless steel; and / or the socket is made of copper alloy and plated with gold; and / or the mounting plate is made of PPS material.

9. A cable assembly with a sealed joint according to claim 1, characterized in that, The insulating sealing body of the glass sintered four-core connector is a glass sintered body, and the welded socket contact is an iron-nickel alloy with a gold-plated surface.

10. A cable assembly with a sealed joint according to any one of claims 1-9, characterized in that, The ribbon cable is configured as two cables of different lengths; and each ribbon cable has a tin end at both ends, which is used to weld to the welding socket contacts of the four-core plug of the power connection terminal and the glass sintered four-core connector, respectively. After welding, the cables are potted with heat-resistant epoxy resin and then cured.

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