Inspection hole structure

FIELD: image transmission from area with high dynamic pressure to area with low dynamic pressure and prevention of liquid flow from one area to another one.

SUBSTANCE: inspection hole comprises frame with translucent member installed in plastic collar and arranged in the frame. The collar comprises bush and two protective washers. Sealing members are installed on cylindrical surface of translucent member so that the sealing members are located between bush and protective washers. Support ring and flexible member are installed from each end side of the collar. Support ring has rim formed around orifice edge. The flexible member may be made as disk spring washer. The support ring is brought into contact with protective washer over the full surface thereof. All components are retained in frame by means of nut or flange connected to the frame with bolts. Adjustment padding may be installed between the support ring and flexible member.

EFFECT: increased load-bearing capability along with possibility to retain structure air-tightness under the action of shock waves.

3 cl, 1 dwg

 

The invention relates to techniques for high pressure and can be used to transfer images from a region of high dynamic pressure in the area of low pressure with simultaneous obstacle to penetration of the medium from one area to another.

It is known observation window with translucent element having the shape of a truncated cone, which is designed to work in high pressure conditions (see kN. "Bearing and translucent structural elements made of glass" edited by the Academy. Kyiv. "Naukova Dumka". 1987. p.101 RIS). Structurally, the viewing window is made in the form of a translucent member that is mated conical surface with the frame and attached thereto by a flange and bolts. Sealing is achieved by means of a rubber sealing ring to ensure a tight seal at the initial moment when the Assembly is slightly deformed by the flange. Further, when the pressure increases, is self sealing viewing Windows.

The disadvantage of this observation window is its low resistance to shock-wave loading, namely:

1) direct contact of translucent element with a frame made of a durable and rigid material than the translucent element is an additional hub stresses that drive the it to a sharp decrease in the mechanical strength of translucent element;

2) occur in the structural elements of a handhole alternating loads can cause a gap in the contact zone of the translucent element with a frame, with a loss of tightness inspection window and entering the environment from a region of high pressure to an area of low pressure;

3) construction inspection window involves the use of a translucent element, made of a material such as plexiglass, which imposes limitations on the temperature range of use of the observation window.

Also known observation window with a support ring that is designed to work in high pressure conditions (see kN. "Bearing and translucent structural elements made of glass " edited by the Academy. Kyiv. "Naukova Dumka". 1987. str Fig 64). Structurally, the window is made in the form of translucent element has a cylindrical shape, which mates flat end surface through the metal support ring with the flat surface of the frame having a sight opening, and is attached to the frame by means of flange and bolts. To seal between the end surfaces of the translucent member and the rim is a rubber ring that prevents the penetration of the working medium between the support ring and the translucent element, and between the rim and the PBO is s ' ring.

This viewing window is taken as the prototype as the closest in technical essence to declare.

The disadvantage of this observation window is its lack of resistance to shock-wave loading, namely:

1) direct contact of the cylindrical surface of the translucent element with a metal frame is an additional hub stresses in the connection, which may result in deformation of translucent element under the action of high pressure to its destruction, and primarily in the area of the sealing element, which will lead to leakage inspection window;

2) occur in the structural elements of a handhole alternating loads can also lead to the destruction of the translucent element in the zone of its contact with the metal mounting flange and the appearance of gaps between the mating surfaces of the structural members with the sealing ring, when this happens the loss of tightness of the observation window and entering the environment from a region of high pressure to an area of low pressure.

Solved technical problem is to increase the bearing capacity of the structure to maintain its integrity when exposed to shock wave loading.

The goal of the project resh what is fact, in the viewing window containing translucent element has a cylindrical shape, the support ring, the rim and the sealing element, the translucent element installed in a housing of plastic material, which consists of a sleeve and two shields, on the cylindrical surface of the translucent member between the sleeve and protective shields installed sealing elements, with each of the mechanical side of the bracket mounted support ring having a flared at the edge of the hole, and the elastic element, the support ring is in contact with the protective plate along its entire end surface, the fastening parts in the frame is carried out by means of a nut or flange attached to the frame by bolts. The elastic element can be made in the form of Belleville springs. It is possible to install shims between the support ring and the elastic element.

The placement of the translucent element within a housing of plastic material consisting of a sleeve located on the cylindrical surface, and two shields located at the ends, eliminates direct contact of translucent element with a metal frame and support rings, which significantly reduces the formation of stress affecting the mechanical strength of the translucent element. Execution pornog the ring flared edge of the hole, installation of the support rings on both sides of translucent element providing contact over the entire end surface protective washers, installation of the elastic element between the nut and the support ring, and between the frame and the support ring, install shims between the elastic element and the support ring, the fastening of all structural elements installed in the frame using the nuts (flange) allows to obtain the desired level of compression translucent element with the provision of temperature compensation, and also allows you to spamfirewall peak components of the shock wave loads acting on the translucent element. Installation of sealing elements on the cylindrical surface of the translucent element between protective washers and sleeve ensures a reliable seal light window under the influence of shock-wave loading.

The drawing shows the light box in the section.

The light box has a casing 1 within which is placed translucent element 2 are installed on the sleeve 3, the protective spacers 4 and the sealing elements 5. The translucent fastening element 2 in the casing 1 is produced by means of nuts 6 through established with the two sides of the translucent element 2, the Belleville spring 7 and the support ring 8 is in contact throughout its end on which ernesti with protective washer 4, and a shim 9.

Does the viewing window as follows:

- when building the selection of the thickness of the shims 9 provide the required level of compression translucent element 2;

- when exposed to shock wave loading on a light box in the initial moment of translucent element 2 moves within the frame 1 on the possible magnitude of compression of the Belleville spring 7, thus extinguished peak components of the shock wave loading, which improves working conditions translucent element 2, with a sharp rise in pressure, and the interaction of translucent element 2 with a metal structural elements of the light box through the plastic elements of the holder (sleeve 3 and the protective washers 4) reduces the effects of stress concentrators in the zone of contact of mating surfaces;

- sealing elements 5 at all stages of loading the observation window are in constant contact with the frame 1 and the translucent element 2, this ensures reliable sealing of the viewing Windows.

We fabricated several laboratory samples of the observation window, which passed testing on shock-wave effect (explosion), with a viewing window provided image transfer from the high pressure area in the region is th low pressure with simultaneous obstacle to penetration of the medium from one area to another.

1. The viewing window containing translucent element has a cylindrical shape, the support ring, the rim and the sealing element, wherein svetoprozrachnyj element installed in a housing of plastic material, which consists of a sleeve and two shields, on the cylindrical surface of the translucent member between the sleeve and protective shields installed sealing elements, with each of the mechanical side of the bracket mounted support ring having a flared at the edge of the hole, and the elastic element, the support ring is in contact with the protective plate along its entire end surface, the fastening parts in the frame is carried out by means of a nut or flange attached to the frame by bolts.

2. The viewing window according to claim 1, characterized in that the elastic element is designed in the form of Belleville springs.

3. The viewing window according to claim 1, characterized in that between the elastic element and the support ring is installed on the adjustment strip.



 

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