Low-inductance cable assembly and manufacturing method thereof

Abstract

The invention discloses a low-inductance cable assembly and a manufacturing method thereof, the low-inductance cable assembly comprises a power supply end multi-core electric connector plug, an ignition tube end electric connector plug and ribbon cables, and the number of the ribbon cables is the same as that of the ignition tube end electric connector plug; wherein the tail end of a first plug jack of the power supply end multi-core electric connector plug is electrically connected with one end of the ribbon cable, and the tail end of a second plug pin of the ignition tube end electric connector plug is electrically connected with the other end of the ribbon cable; and cavities in the first plug shell of the power supply end multi-core electric connector plug and the second plug shell of the ignition tube end electric connector plug which are connected with the ribbon cable are encapsulated and cured by insulating pouring sealant. The low-inductance ribbon cable is adopted, loss and attenuation of high-voltage pulse current in the transmission process can be reduced to the maximum extent, it is ensured that the slapper ignition tube obtains enough energy at the key moment, and therefore reliable ignition is achieved.

Description

Technical Field

[0001] This invention relates to the field of electrical connector technology, specifically to a low-inductance cable assembly and its manufacturing method. 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. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a low-inductance cable assembly and its manufacturing method, 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 low-inductance cable assembly for transmitting high-voltage pulse current from an inline power supply to an ignition tube, comprising: a power-end multi-core electrical connector plug, at least one ignition tube-end electrical connector plug, and at least one ribbon cable connecting the power-end multi-core electrical connector plug and the ignition tube-end electrical connector plug, wherein the number of ribbon cables is the same as the number of ignition tube-end electrical connector plugs; wherein the tail end of the first plug socket of the power-end multi-core electrical connector plug is electrically connected to one end of the ribbon cable, and the tail end of the second plug pin of the ignition tube-end electrical connector plug is electrically connected to the other end of the ribbon cable; and the cavities within the first plug housing of the power-end multi-core electrical connector plug and the second plug housing of the ignition tube-end electrical connector plug, after being connected to the ribbon cable, are both potted and cured with insulating potting compound.

[0008] As a further improvement, the power supply end multi-core electrical connector plug is a four-core plug, and the ignition tube end electrical connector plug is a two-core plug; and the four-core plug is led out by two ribbon cables and connected to a two-core plug respectively.

[0009] As a further improvement, the power supply multi-core electrical connector plug includes: a first plug dust cover, a first plug housing, a first plug mounting plate, a first plug sleeve, a first plug socket, a first plug retaining ring, and a first plug connecting ring; a cavity is formed inside the first plug housing, and the first plug mounting plate is installed inside the cavity, and a plurality of first plug sockets are provided inside the first plug mounting plate; a first plug connecting ring is installed on the outer sleeve of the first plug housing, and a first plug retaining ring for sealing is provided between the first plug housing and the first plug connecting ring, and an opening for installing the first plug dust cover is formed between the first plug housing and the first plug connecting ring.

[0010] As a further improvement, a first plug sleeve made of stainless steel is provided on the front end of the first plug socket, and the first plug sleeve is pressed from the mating end of the first plug socket to the step of the first plug socket.

[0011] As a further improvement, a groove is provided on the outer side of the first plug housing to accommodate the first plug retaining ring, so as to limit the installation of the first plug retaining ring.

[0012] As a further improvement, the first plug housing and the first plug connecting ring of the power supply multi-core electrical connector plug are made of 316L stainless steel; and / or the first plug socket is made of tin bronze with gold plating.

[0013] As a further improvement, the ribbon cable is bent in an "S" shape; and the conductor of the ribbon cable is copper foil, the insulation layer is polyimide film, and both ends are provided with tin surfaces, which are used for soldering to the power supply end multi-core electrical connector plug and the ignition tube end electrical connector plug, respectively.

[0014] As a further improvement, the ignition tube end electrical connector plug includes: a second plug mounting plate, second plug pins, a second plug housing, a second plug stainless steel rivet sleeve, a second plug spring washer, and a second plug screw. The second plug housing has a cavity, and the second plug mounting plate is installed within this cavity. The second plug mounting plate contains a plurality of second plug pins. The second plug housing also has a rivet sleeve mounting hole, and one end of the second plug stainless steel rivet sleeve is inserted into this rivet sleeve mounting hole. The second plug stainless steel rivet sleeve has a screw mounting hole, and the second plug screw is disposed within this screw mounting hole and threadedly connected to the end of the second plug stainless steel rivet sleeve closest to the second plug housing. An enlarged space is formed at the end of the screw mounting hole furthest from the second plug housing, and a second plug spring washer, fitted over the second plug screw, is disposed within this enlarged space.

[0015] As a further improvement, a dust cover for the second plug is provided on the front end of the second plug housing.

[0016] As a further improvement, the first plug housing of the ignition tube end electrical connector is made of nickel-plated aluminum alloy, and the first plug pin is made of gold-plated tin bronze.

[0017] Furthermore, the present invention also solves the above problems through the following technical solutions:

[0018] A method for manufacturing a low-inductance cable assembly, comprising the following steps:

[0019] S100, Raw Material Preparation and Processing:

[0020] The opening of the first plug socket is closed. After closing, the pre-insertion pin is pre-inserted several times. After a certain period of time, the separation force of the first plug socket is sampled and tested to see if it reaches 0.8N~1.8N.

[0021] Then, press the first plug sleeve from the front end of the first plug socket to the rear end of the first plug socket, where it abuts against the step outside the first plug socket, and the first plug sleeve is flush with the outside of the first plug socket; after standing for a certain period of time, the separation force of the first plug socket with the first plug sleeve installed is 100% tested and recorded; at this time, whether the separation force of the first plug socket reaches 0.8N to 1.8N;

[0022] S200, Material Baking:

[0023] Before assembly, the second plug pins, the first plug socket, the first plug mounting plate, the second plug mounting plate, and the ribbon cable are baked at high temperature for 30 minutes to dry and remove moisture.

[0024] S300, Component Assembly and Welding:

[0025] The second plug pin is crimped and fixed inside the second plug mounting plate so that one end of the second plug pin extends out of the second plug mounting plate and the bending plane of the second plug pin is flush with the end face of the mounting plate. Then, the solder points at both ends of the ribbon cable are pre-tinned with a soldering iron. The solder points are then soldered to the tail of the second plug pin of the ignition tube end connector plug and the tail of the first plug socket of the power supply end multi-core connector plug, respectively. The solder slag is cleaned after soldering.

[0026] S400, Bonding and Potting:

[0027] Prepare a certain amount of adhesive by weight of DG-4 A: B = 1:1, stir evenly for no less than 5 minutes; use a toothpick to apply an appropriate amount of adhesive evenly around the potting area, ensuring that the holes of the product correspond one by one before potting.

[0028] S500, Curing and Cleaning:

[0029] After potting, the components are cured in a forced-air drying oven at 80℃±2℃ for 6 hours. After curing, the components are cleaned to remove any residual adhesive.

[0030] As a further improvement, the potting method in S400 includes:

[0031] S401. Preparations before filling;

[0032] Install the first plug mounting plate of the multi-core electrical connector plug into the first plug housing. The 1 / 2 hole position is on the same side as the plug main key position. The end face of the first plug mounting plate is flush with the mating end face of the first plug housing. Use polyimide tape to wrap and protect the ribbon cable to prevent the potting compound from sticking to the ribbon cable during potting.

[0033] S402, preparation of potting compound;

[0034] Prepare the potting compound by weight and mix it evenly with a toothpick; pour the prepared potting compound into the cylinder of the syringe, insert the syringe needle from one side of the ribbon cable, and slowly push the syringe until the initial potting is completed;

[0035] Let it stand for 3 hours at 25℃±3℃, and pop any air bubbles that appear in time; during the standing process, observe and add glue with a syringe as needed.

[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0037] (1) The present invention uses a strip cable with low inductance design, which can minimize the loss and attenuation of high-voltage pulse current during transmission, ensuring that the ignition tube of the impact plate obtains sufficient energy at the critical moment, thereby reliably igniting. Its electrical performance is stable and remains consistent under low atmospheric pressure of 270Pa and normal temperature and pressure environments, so as to provide excellent electrical performance and reliability; the strip cable has a small thickness and volume, and occupies less radial space, making it particularly suitable for wiring in flat or narrow spaces. The cable can be bent in an "S" shape, which can closely fit the outer circle of the cylinder for wiring, saving space and facilitating installation.

[0038] (2) The four-core plug at the power end of the present invention directly leads out two two-core plugs through a ribbon cable, reducing intermediate transfer links and making the structure compact. This not only reduces assembly complexity but also improves the overall reliability of the cable assembly.

[0039] (3) The low-inductance cable assembly produced by the method of the present invention has a simple structure, can guarantee electrical performance, prevents leakage current under low air pressure requirements, and has no breakdown or arcing phenomenon. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a low-inductance cable assembly according to the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the multi-core electrical connector plug at the power supply end of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of the ribbon cable of the present invention;

[0043] Figure 4 This is a schematic diagram of the layer distribution of the ribbon cable of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the electrical connector plug at the firing tube end of the present invention;

[0045] Figure 6 This is a short-circuit test current curve of the cable assembly of the present invention;

[0046] Figure 7 This is a schematic diagram of the structure of the first plug socket of the present invention;

[0047] Figure 8 This is a schematic diagram showing the installation of the first plug socket and the first plug sleeve of the present invention;

[0048] Figure 9 This is a schematic diagram of the installation of the second plug mounting plate and the second plug pins of the present invention;

[0049] Figure 10 This is a schematic diagram showing the installation of the ribbon cable and the second plug pin of the present invention;

[0050] Figure 11 This is a schematic diagram showing the installation of the ribbon cable and the first plug socket of the present invention;

[0051] Figure 12 This is a schematic diagram of the installation of the polyimide tape of the present invention.

[0052] Figure label:

[0053] 1. Power supply end multi-core electrical connector plug; 101. First plug dust cover; 102. First plug housing; 103. First plug mounting plate; 104. First plug sleeve; 105. First plug socket; 1051. Socket end closing; 1052. Step; 106. First plug retaining ring; 107. First plug connecting ring; 2. Ribbon cable; 201. Copper foil; 202. Polyimide film; 203. Tin surface; 204. Polyimide tape; 3. Ignition tube end electrical connector plug; 301. Second plug mounting plate; 3011. Mounting plate end face; 302. Second plug pin; 3021. Pin bending plane; 303. Second plug housing; 3031. Enlarged space; 304. Second plug stainless steel rivet sleeve; 3041. Riveting position; 305. Second plug spring washer; 306. Second plug screw; 307. Second plug dust cover. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Example 1:

[0056] Combined with appendix Figure 1-12 As shown, a low-inductance cable assembly includes: a power-end multi-core electrical connector plug 1, multiple ignition tube-end electrical connector plugs 3, and a ribbon cable 2 connecting the power-end multi-core electrical connector plug 1 and the ignition tube-end electrical connector plugs 3. The number of ignition tube-end electrical connector plugs 3 is N times the number of power-end multi-core electrical connector plugs 1, where N is an integer greater than or equal to zero. The tail end of the first plug socket 105 of the power-end multi-core electrical connector plug 1 is electrically connected to one end of the ribbon cable 2, and the tail end of the second plug pin 302 of the ignition tube-end electrical connector plug 3 is electrically connected to the other end of the ribbon cable. The cavities within the first plug housing 102 of the power-end multi-core electrical connector plug 1 and the second plug housing 303 of the ignition tube-end electrical connector plug 3 after connection to the ribbon cable 2 are potted and cured with insulating potting compound.

[0057] In this embodiment, the power supply end multi-core electrical connector plug 1 is a four-core plug, and the ignition tube end electrical connector plug 3 is a two-core plug; the four-core plug is led out through two ribbon cables, and each is connected to a two-core plug.

[0058] In one specific embodiment, the power supply multi-core electrical connector plug 1 includes: a first plug dust cover 101, a first plug housing 102, a first plug mounting plate 103, a first plug sleeve 104, a first plug socket 105, a first plug retaining ring 106, and a first plug connecting ring 107, etc., wherein a cavity is formed inside the first plug housing 102, and the first plug mounting plate 103 is installed in the cavity. A plurality of first plug sockets 105 are provided inside the first plug mounting plate 103; a first plug sleeve 104 is provided on the front end of the first plug socket 105; the first plug sleeve 104 is made of stainless steel, and the fit between the first plug socket 105 and the first plug sleeve 104 is a transition fit. An assembly tool is used to press the first plug sleeve from the mating end of the first plug socket to the step of the first plug socket to ensure proper assembly. The first plug housing 102 has a slot for accommodating the first plug retaining ring 106. The first plug connecting ring 107 is sleeved and installed on the outside of the first plug housing 102, and the first plug retaining ring 106 is disposed between the first plug housing 102 and the first plug connecting ring 107 to achieve a seal. An opening is formed on the front side between the first plug housing 102 and the first plug connecting ring 107, and the first plug dust cover 101 is inserted into the opening to achieve a sealed dustproof environment for the multi-core electrical connector plug 1 at the power supply end.

[0059] The tail of the ribbon cable 2 is connected to the ignition tube end electrical connector plug 3. In this embodiment, two ribbon cables 2 are provided, with different lengths; preferably, the lengths are 4010mm and 1125mm respectively. The ribbon cable is bent in an "S" shape, which facilitates installation around the cylindrical structure. The conductor of the ribbon cable is copper foil 201, and the insulation layer is polyimide film 202. Both ends are provided with tin surfaces 203, which are used for soldering to the power supply end multi-core electrical connector plug 1 and the ignition tube end electrical connector plug 3 respectively. The ribbon cable is made of alternating copper foil 201 and polyimide film 202, with the outer layer being polyimide film 202.

[0060] The ignition tube end electrical connector plug 3 includes: a second plug mounting plate 301, second plug pins 302, a second plug housing 303, a second plug stainless steel rivet sleeve 304, a second plug spring washer 305, and a second plug screw 306. The second plug housing 303 has a cavity, and the second plug mounting plate 301 is installed within this cavity. Several second plug pins 302 are disposed within the second plug mounting plate 301. A rivet sleeve mounting hole is also provided near the edge of the second plug housing 303. One end of the second plug stainless steel rivet sleeve 304 is inserted into this rivet sleeve mounting hole. A screw mounting hole is provided within the second plug stainless steel rivet sleeve 304. The second plug screw 306 is disposed within the screw mounting hole and threadedly connected to the end of the second plug stainless steel rivet sleeve 304 near the second plug housing 303. An enlarged space 3031 is formed at the end of the screw mounting hole away from the second plug housing 303. A second plug spring washer 305, fitted over the second plug screw 306, is disposed within the enlarged space 3031. A second plug dust cover 307 is provided on the outer side of the front end of the second plug housing 303.

[0061] In this embodiment, both ends of the stainless steel rivet sleeve 304 of the second plug are provided with rivet positions 3041. For example, the front end of the stainless steel rivet sleeve 304 of the second plug, which is close to the dust cover 307 of the second plug, is riveted outward, and the rear end is riveted inward, so as to fix the stainless steel rivet sleeve 304 of the second plug in the housing 303 of the second plug and to close the screw mounting hole of the stainless steel rivet sleeve 304 of the second plug inward.

[0062] The first plug housing 102 and the first plug connecting ring 107 of the multi-core electrical connector plug 1 at the power end are made of 316L stainless steel, and its first plug socket 105 is made of gold-plated tin bronze QSn4-3-Y; the second plug housing 303 of the two-core plug is made of nickel-plated aluminum alloy 2A12-T4, and its first plug pin 302 is made of gold-plated tin bronze QSn4-3-Y.

[0063] Example 2:

[0064] A method for manufacturing a low-inductance cable assembly includes the following steps:

[0065] S100, Raw material preparation and processing: The socket end 1051 at the front end of the first plug socket 105 is finished, such as... Figure 7After sealing, use a Φ1mm pre-insertion pin to pre-insert three times. After aging for 48 hours, sample testing is performed to check if the separation force reaches 0.8N~1.8N. If it reaches this value, it is considered qualified; otherwise, it needs to be reworked. If one or more first plug sockets 105 have unqualified separation force, the entire batch of sockets should be re-sealed or pre-inserted. Those with high separation force should be pre-inserted multiple times; those with low separation force should have the sealing force appropriately increased. Then, press the first plug sleeve 104 from the front end of the first plug socket 105 to the rear end of the first plug socket 105, abutting against the step 1052 outside the first plug socket 105, and make the first plug sleeve 104 flush with the outside of the first plug socket 105. Figure 8 After standing for 48 hours, the separation force was 100% tested and recorded using a fully automatic connector insertion and extraction testing machine. During the test, a Φ0.97 standard pin was used. The separation force of the first plug socket 105 was 0.8N~1.8N, and the insertion depth was 4.4mm. The standard pin was tested before each batch was used, and its size must be guaranteed to be between ∅0.965mm and ∅0.970mm in diameter. Any first plug socket 105 with unqualified separation force during the test should be rejected.

[0066] When preparing raw materials, it is necessary to check that the appearance of the first plug socket 105 is free from burrs and mechanical damage, and that the gold plating layer of the first plug socket 105 is bright and firm, without bubbling or peeling.

[0067] S200. Material Baking: Before assembly, place the second plug pin 302, the first plug socket 105, the first plug mounting plate 103, the second plug mounting plate 301, and the ribbon cable in an oven and bake at 80℃ for 30 minutes to remove moisture. After drying, if placed in a normal environment (air-conditioned room), complete the assembly and welding on the same day. If welding is performed the day after drying, store in a moisture-proof bag and seal it.

[0068] S300, Component Assembly and Welding: Press-fit and fix the second plug pin 302 into the second plug mounting plate 301, such as... Figure 9 The second plug pin 302 is positioned so that one end extends out of the second plug mounting plate 301, and the pin bending plane 3021 of the second plug pin 302 is flush with the end face 3011 of the mounting plate. Then, the solder points at both ends of the ribbon cable are pre-tinned with a soldering iron, and then the solder points are soldered to the tail of the second plug pin 302 of the ignition tube end electrical connector plug 3 and the tail of the first plug socket 105 of the power supply end multi-core electrical connector plug 1, respectively. After soldering, the solder slag is cleaned.

[0069] As a preferred option, such as Figure 10-11During soldering, a thin layer of tin is plated onto both sides of the prepared ribbon cable to form solder joints. The tinning time is less than 3 seconds, and the solder is spread evenly and smoothly on the solder joints, allowing it to cool naturally. The tin-plated ribbon cable is then placed between the two pin ends of the component, and the component is placed on a cable soldering fixture for soldering. After soldering, the component is flipped over to solder the other side. The tin joints at the other end of the ribbon cable are then soldered to the end of the sockets, and the component is flipped over to solder the other side. After soldering, the component is cleaned with anhydrous alcohol to ensure that there are no loose solder slag, flux, or other foreign objects on the cable.

[0070] The welded components are tested for withstand voltage (3000V DC / 1min), insulation resistance (≥5000MΩ), and linear resistance (180mΩ±20mΩ). If the requirements are not met, the components must be reworked and re-welded.

[0071] S400, Bonding and Encapsulation: Prepare a certain amount of adhesive by weight of DG-4 A: B = 1:1 using a beaker. Use a toothpick to stir the various components of the adhesive in one direction until they are evenly mixed. The stirring time should not be less than 5 minutes.

[0072] Using a toothpick, apply a suitable amount of adhesive evenly around the potting area of ​​the second plug mounting plate 301 and the second plug housing 303. Holding the welded joint of the ribbon cable assembly, slowly insert the ribbon cable assembly into the second plug housing 303 from the rear, ensuring that the holes of the product correspond one-to-one. Monitor the adhesive overflow and wipe away any adhesive that has seeped onto the surface of the second plug housing 303 with a cotton swab dipped in alcohol. When gluing the two-core plug in place, a corresponding socket must be used to prevent the mounting plate and plug housing from shifting.

[0073] The corresponding method is to install the four-pin plug.

[0074] The specific steps involved in potting include:

[0075] S401. Preparations before filling;

[0076] And insert the first plug mounting plate 103 of the multi-core electrical connector plug 1 into the first plug housing 102, with the 1 / 2 hole and the plug key on the same side, and the end face of the first plug mounting plate 103 flush with the mating end face of the first plug housing 102; as follows Figure 12 Before potting, use polyimide tape 204 to wrap and protect the ribbon cable. During operation, only one wrap is needed on the ribbon cable. Ensure that the wrapping is neat to prevent the potting adhesive from sticking to the ribbon cable during potting.

[0077] Place the housing of the multi-core electrical connector plug 1 at the power end into the round hole of the potting fixture base, and place the housing of the electrical connector plug 3 at the ignition tube end into the rectangular groove of the potting fixture base. Then, wind the ribbon cable into a coil and pass it through the crossbar of the potting fixture. If necessary (to prevent interference between cables), it can be fixed with thin rope. The plug housing can be reinforced on the potting fixture with paper tape to ensure that the housing is placed vertically and that the ribbon cable is not bent under stress at the root of the housing.

[0078] S402, preparation of potting compound;

[0079] Prepare the potting compound by weight using a beaker. The ratio of epoxy resin-based potting compound A: silicone potting compound B: polyurethane potting compound C = 100:25.5:25.5. Mix thoroughly with a toothpick. Pour the prepared potting compound into the syringe barrel, insert the plunger, and gently squeeze to expel any air from the barrel. Insert the syringe needle into the pin mounting plate step inside the plug housing from one side of the flat cable, and slowly push the syringe until the compound level is slightly below the housing surface. Let it stand at 25℃±3℃ for 3 hours, observing the compound surface frequently and popping any air bubbles that appear with a toothpick. During the standing process, the compound surface may sink; observe this and add more compound as needed using the syringe. When adding more compound, inject it from above the compound level.

[0080] S500, Curing and Cleaning: After potting, cure in a forced-air drying oven at 80℃±2℃ for 6 hours. After curing, clean the exterior of the component and remove any residual adhesive.

[0081] Specifically, use a gauze pad or cotton swab soaked in anhydrous alcohol to clean up any overflowing adhesive. Place the adhesive, along with the potting equipment, into a forced-air drying oven for heat preservation and curing. The temperature should be controlled at 80℃±2℃ for 6 hours. During the curing period, observe the adhesive every half hour for the first hour to see if any flows out or bubbles appear. If any adhesive flows out, wipe it off immediately. If bubbles appear, use a toothpick to break them and then apply more adhesive until the surface is level with the adhesive.

[0082] After curing, perform a visual cleaning of the cable assembly, removing the protective polyimide tape at the base of the casing, ensuring no residue or other stains remain. When cleaning the casing, use a single-edged blade to scrape away any remaining adhesive, then clean with a cotton cloth or swab dampened with anhydrous alcohol. Avoid scratching the casing while scraping. If there are stains on the ribbon cable, wipe them with a cotton swab dampened with a small amount of alcohol.

[0083] The cable assemblies manufactured using the above process have been tested and found to meet the design requirements in terms of electrical performance, low-pressure performance, and pulse current transmission capability, ensuring the reliable function of the impact plate ignition tube.

[0084] The cable assembly of the present invention was tested:

[0085] I. Short-circuit test;

[0086] Typical short-circuit discharge current curves of test cable assemblies

[0087] load short circuit current First peak current time (rise time, Δt) ≤550ns The current at the first peak (I1) ≥1200A

[0088] See attached document Figure 6 The short-circuit discharge waveform of a 4405mm long ribbon cable assembly was tested. Under the condition of 0.4uF / 1700V, the typical short-circuit discharge curve is shown in the table above. The parameters specified in the table should meet the relevant requirements in the table. The low inductance characteristic of the ribbon cable plays a key role in resisting the attenuation of the pulse current.

[0089] 1. Electrical performance;

[0090] 2.1 Dielectric withstand voltage

[0091] 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)

[0092] 2.2 Insulation resistance

[0093] 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.

[0094] 2.3 Linear Resistance

[0095] The cable assembly was tested according to method 3004 of GJB 1217A-2009, and the resistance of each channel was measured to be 180mΩ±20mΩ, which meets the product usage requirements.

[0096] 2. Low air pressure requirement;

[0097] 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.

[0098] 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 devise many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. A low inductance cable assembly for transmitting high voltage pulsed current output from an in-line power supply to a slapper squib, characterized by, The application relates to a power supply end multi-core electric connector plug (1), not less than one igniter end electric connector plug (3), and not less than one ribbon cable (2) connected between the power supply end multi-core electric connector plug (1) and the igniter end electric connector plug (3), wherein the number of the ribbon cables (2) is the same as that of the igniter end electric connector plugs (3); the tail end of a first plug hole (105) of the power supply end multi-core electric connector plug (1) is electrically connected with one end of the ribbon cable (2), and the tail end of a second plug pin (302) of the igniter end electric connector plug (3) is electrically connected with the other end of the ribbon cable (2); and the cavities in the first plug shell (102) of the power supply end multi-core electric connector plug (1) and the second plug shell (303) of the igniter end electric connector plug (3) connected with the ribbon cable (2) are filled with insulating pouring glue and solidified. The power supply end multi-core electric connector plug (1) is a four-core plug, the igniter end electric connector plug (3) is a two-core plug, and the four-core plug is connected with one two-core plug through two ribbon cables (2) respectively.

2. A low inductance cable assembly according to claim 1, wherein, The power supply end multi-core electric connector plug (1) comprises a first plug dustproof cover (101), a first plug shell (102), a first plug mounting plate (103), a first plug sleeve (104), a first plug hole (105), a first plug ring (106) and a first plug connecting ring (107).

3. A low inductance cable assembly according to claim 1, wherein, A cavity is formed in the first plug shell (102), the first plug mounting plate (103) is arranged in the cavity, and a plurality of first plug holes (105) are arranged in the first plug mounting plate (103). The first plug connecting ring (107) is arranged outside the first plug shell (102), the first plug ring (106) is arranged between the first plug shell (102) and the first plug connecting ring (107), and an opening for arranging the first plug dustproof cover (101) is formed between the first plug shell (102) and the first plug connecting ring (107). A first plug sleeve (104) made of stainless steel is arranged at the front end of the first plug hole (105), and the first plug sleeve (104) is press-fitted to the step (1052) of the first plug hole (105) from the plug-in end of the first plug hole (105).

4. A low inductance cable assembly according to claim 3, wherein, The first plug shell (102) and the first plug connecting ring (107) of the power supply end multi-core electric connector plug (1) are made of 316L stainless steel, and / or the first plug hole (105) is made of tin bronze with a gold-plated surface.

5. A low inductance cable assembly according to claim 3, wherein, The ribbon cable (2) is bent in an "S" shape, the conductor of the ribbon cable (2) is a copper foil (201), the insulating layer is a polyimide film (202), tin surfaces (203) are arranged at both ends of the ribbon cable (2), and the tin surfaces (203) are respectively used for welding with the power supply end multi-core electric connector plug (1) and the igniter end electric connector plug (3).

6. A low inductance cable assembly according to claim 1, wherein, ​ 7. A low inductance cable assembly according to claim 1, wherein, The firing tube end electric connector plug (3) comprises a second plug mounting plate (301), a second plug pin (302), a second plug shell (303), a second plug stainless steel rivet sleeve (304), a second plug spring washer (305), and a second plug screw (306), wherein the second plug shell (303) is internally provided with a cavity, the second plug mounting plate (301) is mounted in the cavity, and the second plug mounting plate (301) is internally provided with a plurality of second plug pins (302); The second plug shell (303) is further provided with a rivet sleeve mounting hole, and one end of the second plug stainless steel rivet sleeve (304) is limitingly inserted and mounted in the rivet sleeve mounting hole; The second plug stainless steel rivet sleeve (304) is internally provided with a screw mounting hole, the second plug screw (306) is arranged in the screw mounting hole and is in threaded connection with the second plug stainless steel rivet sleeve (304) internally close to one end of the second plug shell (303); one end of the screw mounting hole away from the second plug shell (303) is formed with an enlarged space (3031), and the enlarged space (3031) is internally provided with the second plug spring washer (305) sleeved on the outside of the second plug screw (306); The second plug shell (303) is externally provided with a second plug dust cover (307) at the front end.

8. A low inductance cable assembly according to claim 7, wherein, The first plug shell (102) of the firing tube end electric connector plug (3) is made of an aluminum alloy with a nickel-plated surface, and the first plug pin is made of tin bronze with a gold-plated surface.

9. A method of making a low inductance cable assembly for making a low inductance cable assembly as claimed in any one of claims 1 to 8, characterised in that, The method comprises the following steps: S100, raw material preparation and processing: The first plug jack (105) is subjected to a closing treatment on the jack closing portion (1051) at the front end, and a pre-pin is pre-inserted after the closing treatment, and after a certain period of time, it is detected whether the separation force of the first plug jack (105) reaches 0.8N-1.8N; Then, the first plug sleeve (104) is externally pressed and matched from the front end of the first plug jack (105) to the rear end of the first plug jack (105) and abuts against the step (1052) outside the first plug jack (105), and the first plug sleeve (104) is flush with the outside of the first plug jack (105); after a certain period of time, the separation force of the first plug jack (105) with the first plug sleeve (104) mounted thereon is 100% inspected and recorded; at this time, whether the separation force of the first plug jack (105) reaches 0.8N-1.8N; S200, material baking: Before assembly, the second plug pin (302), the first plug jack (105), the first plug mounting plate (103), the second plug mounting plate (301), and the strip-shaped cable (2) are subjected to high-temperature baking for 30 minutes to dry and remove moisture; S300, assembly and welding of components: The second plug pin (302) is press-fitted and fixed in the second plug mounting plate (301), so that one end of the second plug pin (302) extends out of the second plug mounting plate (301), and the pin bending plane (3021) of the second plug pin (302) is flush with the end face (3011) of the mounting plate; then the tin points at both ends of the ribbon cable (2) are pre-tinned using an electric soldering iron, and then the tin points are respectively welded with the tail of the second plug pin (302) of the ignition tube end electrical connector plug (3) and the tail of the first plug jack (105) of the power end multi-core electrical connector plug (1), and the welding slag is cleaned after welding; S400, bonding and potting: A certain amount of adhesive is prepared by mixing DG-4 A and B in a ratio of 1:1 by weight, and stirring for not less than 5 minutes; an appropriate amount of adhesive is taken with a toothpick and evenly applied around the potting area, ensuring that the product hole positions are one-to-one corresponding before potting; S500, curing and cleaning: After potting, cure in a blast drying oven at 80℃±2℃ for 6 hours, and clean the appearance of the assembly after curing to remove residual glue.

10. The method of claim 9, wherein the low inductance cable assembly is formed by: In the S400, the specific method of potting includes: S401, preparation before potting; The first plug mounting plate (103) of the power end multi-core electrical connector plug (1) is inserted into the first plug housing (102), and the 1 / 2 hole position is on the same side as the plug main key position, and the end face of the first plug mounting plate (103) is flush with the plug-in end face of the first plug housing (102); the ribbon cable (2) is wrapped and protected with polyimide tape (204) to prevent the potting glue from sticking to the ribbon cable (2) during potting; S402, potting glue preparation; Prepare the potting glue by weight and mix it evenly with a toothpick; pour the prepared potting glue into the pressure cylinder of the syringe, and insert the syringe needle from one side of the ribbon cable (2), slowly push the syringe until the initial potting is completed; Rest for 3h at 25℃±3℃, and promptly pick the generated bubbles; and during the resting process, observe and promptly supplement the glue with a syringe.

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