RU2552210C1 - Gate valve of distributing chamber for heat exchanger - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: gate valve is intended for high pressure vessels, namely for heat exchange units. A gate valve includes an in-series located cover, an external compression ring, a diaphragm with a slot, a gasket, a housing of a distributing chamber, a stop bolt and a pressure stock; with that, the cover with outside curved surface has external trapezoid-shaped teeth; some part of the housing of the distributing chamber with outside curved surface is provided with external trapezoid-shaped teeth; a gasket is made in the form of a spirally wound ring; additionally, a clamp in the form of a shell is introduced; two semi-rings with inside curved surface have internal trapezoid-shaped teeth; with that, teeth of the cover, the housing of the distributing chamber and two semi-rings have a profile angle of 25° to 35°, and studs with nuts for preliminary connection of the cover to the housing of the distributing chamber to installation of the semi-rings.

EFFECT: reducing labour input for manufacture of a gate valve of a distributing chamber for a heat exchanger and improving maintainability.

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Description

The invention relates to general engineering, in particular to pressure vessels, in particular to methods of sealing a removable cover of the distribution chamber for detachable type heat exchangers with a retractable tube bundle.

Known threaded shutter of the distribution chamber for a tubular heat exchanger according to the patent KR 20090026143 (A), IPC F28F 9/02, F28F 9/10, publication March 11, 2009.

A threaded shutter of the distribution chamber for the tubular heat exchanger, including a receiving manifold of the distribution chamber, in which a gasket is provided on the protrusion of the distribution chamber, a groove of the membrane is provided to provide pressure to the gasket to achieve a tight connection, an external compression ring located on the back of the diaphragm and loaded with thrust bolts, located on the periphery of the threaded locking ring. This load is transferred through the diaphragm to the gasket to achieve a tight connection. An external compression ring supported by a distribution chamber cover that is held in position by a threaded retaining ring. An external compression ring provided with a plurality of radial holes corresponding to the group of holes in quantity as well as the angular position; the cover of the distribution chamber is provided with a series of blind holes consistent with the group of holes in the manifold of the distribution chamber and, therefore, also with the group of holes in the outer compression ring; a plurality of threaded locking pins are provided for engaging with groups of holes together with adjusting nuts provided on the threaded portion of the threaded locking pins; a plurality of clamps in the form of a pair of inverted “L” -shaped fittings or other shapes or configurations mounted on the manifold of the distribution chamber near the holes and arranged so that the threaded locking pin can easily pass through the same hole, while radially moving the nut outward, which is provided on the stud, is limited to a clamp; the outer diameter of the manifold of the distribution chamber, mating with a threaded retaining ring equipped with a tight tolerance to achieve an accurate fit; a guide ring equipped with threaded fasteners at the end of the manifold of the distribution chamber, the inner diameter of the guide ring is provided with tight tolerance to achieve an exact fit with the mating outer diameter of the threaded retaining ring.

The threaded gate of the distribution chamber for the tubular heat exchanger according to the patent KR 20090026143 (A) is adopted as a prototype.

Known threaded shutter distribution chamber for a tubular heat exchanger has the following disadvantages that complicate the maintenance and repair of the apparatus:

- to install the locking cover of the distribution chamber, having a weight of up to 10-15 tons, a special holding device is required to maintain the cover during the wrapping process

- balancing the threaded assembly, alignment of the threaded retaining ring with thread on the housing of the distribution chamber is a laborious and lengthy process,

- moving the locking ring under its own weight to the lower part of the thread profile, in connection with which there is an eccentricity of the forces on the thread, leading to high voltages, as a result of which it is possible to seize and damage the thread when unscrewing the locking ring during dismantling of the tube bundle.

The task of the invention is to reduce the complexity in the manufacture of the sealing shutter and increase the maintainability of the heat exchanger.

The essence of the claimed invention lies in the fact that the connection of the cover with the surface of the housing of the distribution chamber is brought out in the form of a gear trapezoidal engagement, with the help of which the cover is held in a closed position from the effect of hydrostatic pressure. This design is simple to manufacture, which makes it easy to disassemble the heat exchanger for maintenance, inspection or repair, and then also easily assemble it for use. At the same time, it allows you to perform all operations using a crane.

The technical result of the claimed invention is to reduce the complexity in the manufacture of the shutter of the distribution chamber for the heat exchanger and increase the maintainability of the heat exchanger.

This technical result is achieved by solving a technical problem aimed at increasing the durability and reliability of the design of the shutter of the distribution chamber.

This technical problem is solved due to the fact that in the well-known shutter of the distribution chamber for the heat exchanger, containing a successively arranged cover, an external compression ring, a membrane with a groove providing pressure on the gasket to achieve a tight connection, the gasket, the housing of the distribution chamber, the thrust bolt and coaxially with a pressure rod, a cover with an external curved surface made with external trapezoidal teeth, a part of the housing of the distribution chamber with an external curved a surface made with external trapezoidal teeth, a gasket made in the form of a spiral-wound ring, an additional collar in the form of a shell, two half rings with an internal curved surface, made with internal trapezoidal teeth, the teeth of the lid, the housing of the distribution chamber and two half rings made with a profile angle from 25 ° to 35 °, and studs with nuts for preliminary connection of the cover with the housing of the distribution chamber before installing the half rings.

The design of the shutter of the distribution chamber for the heat exchanger is shown in the drawing (Fig. 1).

The shutter of the distribution chamber for the heat exchanger contains successively arranged cover 1, an external compression ring 2, a membrane 3 with a groove providing pressure on the gasket to achieve a tight connection, gasket 4, the housing of the distribution chamber 5, the stop bolt 6 and the pressure rod 7 aligned with it, this cover 1 with the outer curved surface is made with external trapezoidal teeth, part of the housing 5 of the distribution chamber with the outer curved surface is made with external trapezoidal with my teeth, the gasket 4 is made in the form of a spiral-wound ring, an additional collar 8 is introduced in the form of a shell, two half rings 9 with an internal curved surface are made with internal trapezoidal teeth, while the teeth of the cover 1, the housing 5 of the distribution chamber and two half rings 9 are made with profile angle from 25 ° to 35 °, and studs 10 with nuts 11 for preliminary connection of the cover 1 with the housing 5 of the distribution chamber before installing the half rings 9.

The shutter of the distribution chamber for the heat exchanger operates as follows (see figure 1).

The gasket 4, made in the form of a spiral-wound ring, is installed in the groove of the membrane 3. A membrane 3 is placed inside the housing of the distribution chamber 5. To keep the membrane 3 in the required position, a compression ring 2 is installed, which is fixed to the camera body 5 by means of set screws with a flat end and a slot for a screwdriver. The set screws are screwed into the radial holes with a thread provided in the compression ring 2, while the set screws are flush with respect to the inner diameter of the compression ring 2 so as not to interfere with the chamber cover.

The cover 1, with the help of a lifting device, is inserted inside the housing 5 of the distribution chamber and fixed by means of studs 10 and nuts 11. To connect the cover 1 to the surface of the housing 5 of the distribution chamber, two half rings 9 are mounted on the trapezoidal teeth of the cover and the housing, which are pulled together by four brackets , studs and nuts. After that, the clamp 8 is retracted into two half rings 9. Then, push rods 7 are installed through the threaded holes cut into it and the stop bolts 6 are screwed in. To tighten the bolts 6, it is necessary to loosen the fasteners tightening the two half rings 9 and tighten the bolts 6 s using a torque wrench in the sequence of the “modified star” in several passes to the specified torque value, which provides gasket assembly 4 sealing.

The shutter is ready for hydraulic testing and operation. In this case, the pressure arising inside the housing of the distribution chamber is transmitted via gearing to the half rings held by the clamp mounted on top.

A prototype of the shutter of the heat exchanger distribution chamber was manufactured and passed hydrotesting. The sample withstood the test at a given test pressure under normal conditions. Simultaneously with hydraulic tests, an experimental determination was made of the stress-strain state of the shutter structural elements using a strain gauge. The result of the experimental studies showed that the nature of the distribution and the level of actual stresses on the gate surface, in general, correspond to the data of calculations performed on the basis of numerical analysis methods.

Using this design allowed to reduce the complexity of the manufacture of the shutter while ensuring its tightness and increase maintainability.

Claims (1)

A shutter of a distribution chamber for a heat exchanger, comprising a cover in series, an external compression ring, a membrane with a groove providing pressure on the gasket to achieve a tight connection, gasket, distribution chamber housing, a stop bolt and a pressure rod aligned with it, characterized in that the cover is external curved surface is made with external trapezoidal teeth, part of the housing of the distribution chamber with an external curved surface is made with external trapezoid visible teeth, the gasket is made in the form of a spiral-wound ring, an additional collar is introduced in the form of a shell, two half rings with an internal curved surface are made with internal trapezoidal teeth, while the teeth of the cover, the housing of the distribution chamber and two half rings are made with a profile angle from 25 ° to 35 °, and studs with nuts for preliminary connection of the cover to the housing of the distribution chamber before installing the half rings.

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