Sealed plug

FIELD: instrumentation engineering; space-rocket technology, aeronautical engineering, and advanced radio electronic devices.]

SUBSTANCE: proposed sealed plug has metal shroud that incorporates cylindrical part being jointed, rectangular flange, and cylindrical wiring tail, as well as glass insulator installed within shroud and reinforced by dowel pins. Shroud accommodates intermediate steel ring assembled by tight fit, its inner diameter being equal to outer one of glass insulator. Plug shroud is built of two parts of which first one has cylindrical part being jointed and front end of rectangular flange abutting against the latter and made of light-mass metal alloys whose coefficient of linear expansion is close to that of steel, as well as second end of rectangular flange abutting against cylindrical wiring tail, and cylindrical wiring tail, both made of steel.

EFFECT: reduced size and mass at high degree of plug tightness.

1 cl, 1 dwg

 

The invention relates to the field of instrumentation and can be widely used in the products of rocket and space technology, aerospace and other fields of national economy, using modern electronic devices, which have to meet stringent requirements for weight and size characteristics.

Known multi-explosion-proof electric connector according to the author's certificate of the USSR 1069037, H 01 R 23/00, which consists of two parts, each of which has a housing with installed insulation pads, contact and guide elements made in the form of pins and sockets with a stepped outer surface. Each of the housing is made of at least two interior ledges. The disadvantage of the electrical connector are large overall dimensions, which do not allow to create miniature devices.

Known electrical connector according to the author's certificate of the USSR 1229868, H 01 R 13/62, which consists of a plug and socket, located in the respective housings and having insulators with contact elements on buildings hosted sites to secure the cable. The plug has an annular groove, and the body of the socket has an annular groove, threaded and through the longitudinal slots. The disadvantages of this connection the preserver are significant physical specifications, as well as the unsuitability of the work under the influence of vacuum.

The closest in technical essence and the achieved result of the present invention prototype is sealed plug, the description of which is given in the author's certificate of the USSR 1508303, H 01 R 13/52. Specified hermetic plug includes a housing made of metal, having cochineal cylindrical portion, a rectangular flange, a cylindrical shank, and a glass insulator mounted in the housing cavity and reinforced with pins. In addition, the plug further comprises a sealing insulator, reinforced metal inputs and flexible conductors, pairs of connecting pins of the glass insulator and the inputs sealing insulator.

In the initial state flexible conductors SAG freely between the pins of the glass insulator and metal inputs additional sealing insulator. Each hermetical input sealing insulator is valid effort. In the process of articulation and dismemberment pins and sockets operates AC total force.

The disadvantage of the prototype, and similar devices, is a large mass of tight plug which cases, usually made of steel, and that it in addition to the metal housing is used and the metal is static inputs, which also increases the mass of sealed plug.

Thus, we can conclude that the above designs have a large mass and dimensional characteristics, which greatly complicates their use in rocket and space technology.

The objective of the invention is to provide such a sealed plug that could be used in rockets by reducing the mass and dimensional characteristics while ensuring a high degree of tightness of electrical connectors, and in particular sealed plug.

The technical result is achieved due to the fact that in the proposed hermetic plug, comprising a housing made of metal, having cochineal cylindrical portion, a rectangular flange and a cylindrical shank, and a glass insulator mounted in the housing cavity and reinforced with pins, unlike the prototype, introduced transitional steel ring set into the body cavity of the plug sealing seat, the inner diameter of the transition of the steel ring is equal to the outside diameter of the glass insulator, and the plug is made of two parts, selenaaa cylindrical part of which and the adjacent side of the rectangular flange made of light metal alloy with a coefficient of linear expansion close to to the ratio of linear expansion of steel, and adjacent to the cylindrical shank side of the rectangular flange and a cylindrical shank is made of steel.

In addition, the first and second housing parts are interconnected by a method of friction welding.

It should be noted that as light metal alloys are encouraged to use alloys based on aluminium, magnesium and other supplements. Given that the coefficient of linear expansion of aluminum is equal to 22, then through the use of other additives can increase the coefficient of linear expansion to the size of 11.5-14, which corresponds to the coefficient of linear expansion of steel, which is equal to 11,5-14.

The sealed design of the plug shown in the drawing, consists of a hollow metal housing 1, which has cochineal cylindrical portion 2, a rectangular flange 3, consisting of adjoining cylindrical part of the housing part 4 and part 5 adjacent to the cylindrical shank 6, a glass insulator 7, reinforced by the pins 8, which in turn is installed in the transitional steel ring 9.

Transitional steel ring 9 by means of cold pressing is installed in the housing 1.

It should be noted that when designing modern electronic equipment is in urgent reduction in weight and size characteristics, and in particular mass and x is the new electrical connectors. This is due to the fact that in modern products of rocket and space technology total number of electrical connectors can reach several thousands, which of course leads to weight reduction of the output payloads.

The problem of weight reduction hermetic plugs is that the coefficients of linear expansion of the housing, which typically is made of steel, and glass are very close to each other, so there is a high tightness of the order of 10 microns Hg/s for helium.

In connection with this application to the entire body of the lighter metals, whose linear expansion coefficient is significantly different from the coefficient of linear expansion of steel is very difficult due to the lowering of standards of integrity.

In this regard, the corps proposed a sealed plug, in contrast to known designs, are made of two parts.

The first part of the housing includes cochineal cylindrical part 2 and the front side 4 of the rectangular flange 3, which is made of light metal alloy with a coefficient of linear expansion of 11.5-14 equal to the coefficient of linear expansion of steel the 11.5-14.

The second part of the housing includes a rear side 5 of the rectangular flange 3 and a cylindrical shank 6, which is made of steel.

The novelty of the proposed sealed plugs also what is that what glass insulator 7 with the pin 8 is placed in the transitional steel ring 9, which in turn is installed in the hollow metal casing 1 by means of cold pressing. Moreover, the placement of the transition steel rings 9 glass insulator 7 in the housing 1 is held so that the transitional steel ring 9 occupies the whole volume of the shank 6 and is only partially volume sochlenenii cylindrical part 2. To ensure a high degree of tightness transitional steel ring 9 is installed in the cavity of the housing 1 by dense planting, the inner diameter of the transition steel ring 9 must be equal to the outside diameter of the glass insulator 7. This setting transition steel rings 9 reduce tensions between the ring 9 and the cylindrical body portion 2 and achieve a high degree of tightness between the shank 6 and transitional steel ring 9, and between the transition of the steel ring 9 and sochlenenii cylindrical body portion 2.

In addition, given that a large part of the body, namely selenaaa cylindrical part 2 and the front side 4 of the rectangular flange 3 is made of light metal alloys, achieve significant weight reduction airtight plug.

So, for example, compared with commercially available electrical connectors t the PA ORMG, mass offer airtight plugs reduced by 25-30%.

Using the proposed sealed plugs, in particular, the booster type "UNION" mass output payloads can be increased by 20-25 kg

It should also be noted that at temperatures within a wide range is not violated, the coefficient of linear expansion between the transitional steel ring 9 glass insulator 7 and the housing 1 sealed plugs, as their coefficients of linear expansion are virtually the same size.

Currently working documentation is developed and manufactured batch of prototypes offer airtight plugs.

1. Sealed plug, comprising a housing made of metal, having cochineal cylindrical portion, a rectangular flange and a cylindrical shank, and a glass insulator mounted in the housing cavity and reinforced with pins, characterized in that it introduced a transitional steel ring set into the body cavity of the plug sealing seat, the inner diameter of the steel of the transition ring is equal to the outside diameter of the glass insulator, and the plug is made of two parts, the front cylindrical part of which and the adjacent side of the rectangular flange made of light metal alloys with CoE what eficienta of linear expansion, close to the coefficient of linear expansion of steel, and adjacent to the cylindrical shank of rectangular flange and a cylindrical shank is made of steel.

2. Sealed plug according to claim 1, characterized in that first and second housing parts are interconnected by a method of friction welding.



 

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