RU223170U1 - Quick-change narrowing device - Google Patents

Abstract

The utility model relates to devices for measuring the flow and quantity of various media (gas, oil, gas condensate, methanol, water, steam, various pulps, water-soil mixtures, etc.) in round pipelines (at any location) in accordance with GOST 8.563. 1-97. The claimed device includes an inlet pipe with a flange, an outlet pipe with a flange, flange seals, a diaphragm holder, a diaphragm, and a diaphragm seal. The inlet and outlet pipes, forming the measuring pipeline, are fastened with a hairpin connection. Seals and a diaphragm holder are installed between the flanges of the pipes. The flanges of the pipes have holes for tapping the pressure of various media, for example, gas, and holes for drainage in the lower part. The pipes also have a central round hole for transporting various media, such as gas. In the diaphragm holder, clamped between the flanges, there is a seal with a diaphragm with a through hole smaller than the hole of the central hole in the nozzles. The coaxial position of the diaphragm with the gas pipeline in the device is ensured by precise installation of the diaphragm holder by fitting the pins connecting the pipes into the grooves and holes (centering) in the eyes of the diaphragm holder. The technical result is to increase the reliability of the device. 4 salary f-ly, 3 ill.

Description

The utility model relates to devices for measuring the flow and quantity of various media (gas, oil, gas condensate, methanol, water, steam, various pulps, water-soil mixtures, etc.) in round pipelines (at any location) in accordance with GOST 8.563. 1-97.

A narrowing device for measuring gas flow is known (see RF patent No. 2147118, class G 01 F 1/42, 1997), containing a housing closed at the top and bottom with lids with a central hole for transporting gas, in which a diaphragm holder with a diaphragm is located, having a calibrated hole for measuring gas flow, coaxial to the axis of the housing channel, a mechanism for moving the holder with a diaphragm and sealing elements.

The disadvantages of the analogue are the lack of an additional seal that prevents possible leaks of substances, including gas, the high cost of manufacturing the device due to the use of a more complex design and a larger number of parts, including a lifting mechanism.

A quick-change narrowing device is known (see patent JP 2016080599, class G01F1/42, publ. 2016.05.16), containing two pipes with flanges, fastened with fasteners, the peripheral part of the diaphragm is clamped between the flanges of the pipe, while the peripheral part of the diaphragm has at least two holes for fastening elements, and they are located in opposite halves of the flange connection, one eye has a groove for a fastening element for installing a diaphragm holder, and the eye located in the opposite half has a hole for a fastening element. The known technical solution makes it possible to reduce the labor costs and time required to connect and disconnect the diaphragm assembly for measuring fluid flow and, thus, reduce the time for inspecting orifice devices.

The disadvantages of the analogue are the absence of a diaphragm holder, fastening of the diaphragm itself to the flanges, which leads to its additional deformation during operation and affects the measurement results, increases the cost of the device, since the dimensions of the expensive element of the device - the diaphragm - increase, the lack of seals between the flanges of the pipes and on the diaphragm, the absence in the nozzles of the pressure tapping holes.

A narrowing device of the quick-change diaphragm type (USDB) is known (see RU patent for utility model 205140, class G01F1/42, published 06.28.2021), which includes a housing, a diaphragm holder, a seal, a diaphragm and a lifting device. The body consists of three parts, fastened with a hairpin connection: two flanges with pipes for connection to the pipeline and a chamber with seals between them. The chamber has a through groove in which a diaphragm with a passage hole is placed in the diaphragm holder. A cover is installed in the upper part of the housing, preventing the removal of the diaphragm holder and the loss of substance from the pipeline, which is joined to the housing in the form of a dovetail connection, while the side edges of the cover cover the housing 1 from the outside. A U-shaped frame with a screw pair is installed on top of the body above the cover and the through groove, which serves as a lifting device for the diaphragm holder. The body is installed on supports - welded metal structures.

The disadvantage of the analogue is a more complex design, primarily due to the removable diaphragm holder, which is not attached with lugs to the flanges using holes and grooves, but is installed in the chamber between the flanges and must be secured with a cover that fits into the body in the form of a dovetail connection, Due to a more complex design, the time for inspection, maintenance and replacement of the device increases, and the cost of the device increases.

A constriction device is also known according to US patent US5396931 with priority dated March 29, 1993, containing a housing with a removable top cover that seals a transverse slot-shaped groove, and holes for taking pressure, separated by a removable holder with a diaphragm, and sealing elements. The cover is secured using expansion bolts, which are screwed into a strip located in the device body.

The disadvantages of the analogue are the lack of an additional seal that prevents possible leaks of substances, including gas, the high cost of manufacturing the device due to the use of a more complex design and a larger number of parts that require precise sharpening and adjustment in size to each other to eliminate gaps.

The closest analogue (prototype) is the restriction device according to US patent US1958854A with priority dated May 16, 1931. This invention relates to the design of a measuring disk with holes and, in particular, to the design of a body of a measuring disk with holes, which is permanently attached between the flanges of a pipe, according to through which the liquid or any type of liquid to be measured passes. The product is distinguished by the presence of a flange connection of two pipes, between which the diaphragm is fixed in the holder, the flanges are fastened with a hairpin connection, and the top is closed with an additional one, which is secured with a hairpin connection.

The disadvantages of the prototype are the lack of an additional seal that prevents possible leaks of substances, including gas, as well as the complex design of the device, which requires the presence of an additional cover over the flanges, increasing the cost of production and the time of disassembling the restriction device for its revision.

The author was faced with the task of creating a quick-change orifice for measuring the flow rate and quantity of various media (gas, oil, gas condensate, methanol, water, steam, various pulps, water-soil mixtures) in round pipelines (at any location) in accordance with GOST 8.563. 1-97. When creating such a device, it was necessary to achieve high reliability of the design, convenience and practicality of its operation, simplify production technology and reduce manufacturing costs.

The technical result is to increase the reliability of the device.

The technical result is achieved as follows:

To measure the flow rate and quantity of various media, a constriction device was created, mounted in the measuring section of the pipeline and being part of this pipeline, through which gas and other substances pass, receiving disturbances due to the existing diaphragm, as a result of which a pressure difference is created. The pressure difference on different sides of the diaphragm is measured by a differential pressure gauge. The pressure of the medium is measured through the hole in front of the diaphragm and the hole located after the diaphragm, and is transmitted to differential pressure gauges and flow computers of the measuring station, which record the flow rate of transported media, for example, gas;

The reliability of the device in comparison with analogues is ensured by the use of pin connections and seals between the flanges and the diaphragm holder, as well as the diaphragm holder and the diaphragm, by placing the diaphragm in the diaphragm holder and the absence of pressure on it other than the pressure of the media in the pipeline, by fixing the diaphragm holder directly to the flanges nozzles with a stud connection without limiting the number of studs, provided that there are at least two of them;

To explain the utility model, a specific example of the implementation of the claimed device is given below with reference to the attached drawings and models, in which:

Figure 1 shows a general view of the proposed device;

fig. 2 – frontal section in figure 1;

fig. 3 – profile section in Fig.1.

The claimed device includes an inlet pipe 1, a diaphragm seal 2, an outlet pipe 3, a diaphragm holder 4, a diaphragm 5, and flange seals 7.

The inlet and outlet pipes forming the measuring pipeline are fastened with a hairpin connection 6. Seals 7 and a diaphragm holder 4 are installed between the flanges of the pipes. The flanges of the pipes have holes A for tapping the pressure of various media, for example, gas, and holes B for drainage in the lower part. Also in the pipes there is a central hole for transporting various media, for example, gas, and a circular cross-section with a diameter of D.

In the diaphragm holder 4, clamped between the flanges of the nozzles, there is a diaphragm 5 with a passage hole d<D and a seal 2. The coaxial position of the diaphragm with the gas pipeline in the device is ensured by accurately installing the diaphragm holder due to the fit of the pins connecting the nozzles in the grooves and holes (centering) in lugs of the diaphragm holder.

Diaphragm holder 4 is an annular metal part that has an internal annular groove for installing seal 2 with interference fit. The diaphragm holder has lugs for precise positioning of the diaphragm holder between the flanges of the nozzles (in the measuring pipeline). The lugs are made as follows: the lugs in one half of the flange connection (usually in the bottom) are made with a groove that allows you to remove and install the diaphragm holder without removing the studs in the corresponding half of the flange connection, but only by unclamping the flanges; the eyes in the opposite half of the flange connection (usually in the top) are made with a hole for a stud.

The described shape and arrangement of the lugs on the diaphragm holder allows you to reduce the time required to inspect the device. Since the lugs in one half of the product only have a groove, they can be lowered/installed onto the studs already fixed in both flanges, rising into the working position. Consequently, to install or remove the diaphragm holder from the device, it is not necessary to remove the studs from this part of the flange connection; it is enough to loosen their tension until the flange allows for acceptable decompression. The studs are removed from the opposite half of the flange connection, through which the diaphragm holder is installed in the pipeline and fixed to the studs through the holes in the eyes or removed from it after removing the studs that prevent the removal of the diaphragm holder. Thus, the time required to inspect the device is reduced by the time required to remove the studs from one of the halves of the flange connection.

Diaphragm seal 2 is a ring part with a groove made of an elastic material, for example rubber. A diaphragm 5 is installed inside the seal 2 in the existing groove. The thickness of the diaphragm 5 is greater than the thickness of the seal groove 2 to ensure tension.

The flanges of the pipes have grooves for installing ring seals 7 made of an elastic material, for example, rubber. Thus, seals 7 with seal 2 create double protection of the flange joint from leakage of the medium, which increases the reliability of this device.

The declared device is connected to a section of the measuring pipeline, the boundaries and geometric characteristics of which, as well as the placement of a restriction device, local resistances, and measuring instruments on it, are standardized by GOSTs 8.586.1-2005, 8.586.2-2005.

The device works as follows.

Through a device mounted in the measuring section of the pipeline and being part of this pipeline, various media, for example gas, are transported under pressure. Passing through the calibrated opening of the diaphragm, the flow of various media, for example, gas, receives disturbances that lead to a pressure difference before and after the diaphragm. The pressure difference on different sides of the diaphragm is measured by a differential pressure gauge. The pressure of the medium is measured through the hole in front of the diaphragm and the hole located after the diaphragm, and is transmitted to differential pressure gauges and flow computers of the measuring station, which record the flow rate of transported media, for example, gas.

If it is necessary to periodically inspect or replace diaphragm 5 and seal 2, they are removed together with diaphragm holder 4. Removing diaphragm holder 4 with seal 2 and installed diaphragm 5 is accomplished by removing the studs in one half of the flange connection, where the eyes of the diaphragm holder 4 are fixed through the holes, loosening the studs in the opposite half of the flange connection and release of the flanges of the inlet and outlet pipes.

After revision or replacement of the diaphragm or seal, they are again installed in the diaphragm holder and clamped between the flanges of the pipes.

For the first time, it is possible to partially disassemble the device to remove the diaphragm holder due to the design of the diaphragm holder lugs, in which the lugs in one part of the diaphragm holder have a groove for installing them on top of the studs, and the lugs in the opposite part have holes for the studs. This solution allows, when disassembling the device to replace the diaphragm holder, not to remove the studs in one half of the flange connection (mainly the bottom), where the diaphragm holder is fixed using lugs with grooves, thereby reducing the time for its maintenance and, consequently, the throughput of the gas pipeline, but maintaining the strength of the structure and tightness of the device elements.

For the first time, the use of two sealing circuits is provided, where the first circuit is located between the flanges and the diaphragm holder, and the second on the diaphragm, creating double protection of the flange joint from leaks of the medium, which ensures high reliability of this device and high measurement accuracy.

Claims (5)

1. A quick-change narrowing device containing two nozzles with flanges, fastened with a pin joint, seals and a diaphragm holder with a diaphragm installed in it, and in the nozzles there are holes for taking pressure, characterized in that the seals are installed between the flanges of the nozzles and on the diaphragm, and the diaphragm holder has lugs located in opposite halves of the flange connection, with one lug having a groove for a pin for installing a diaphragm holder, and the lug located in the opposite half having a hole for a pin. 2. The quick-change narrowing device according to claim 1, characterized in that the diaphragm seal is a ring part with a groove. 3. The quick-change narrowing device according to claim 2, characterized in that the thickness of the diaphragm is greater than the thickness of the diaphragm seal groove. 4. The quick-change narrowing device according to claim 1, characterized in that the flanges of the nozzles have grooves for installing o-ring seals. 5. The quick-change narrowing device according to claim 1, characterized in that the flanges of the pipes have drainage holes in the lower part.

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