RU218048U1 - REDUCING DEVICE QUICK-CHANGE UNIVERSAL - Google Patents

Abstract

The utility model relates to measuring technology and is designed to measure the flow of gases and liquids by the variable pressure drop method. The technical result is the creation of a device, the design of which retains the ability to extract and install the measuring diaphragm without disconnecting the pipeline and the device body, for each conditional diameter of the pipeline, has a single design and geometric dimensions, which allows the device body to be mass-produced and the device to be installed on any pipeline with operating pressure up to 10 MPa. The metal consumption and labor intensity of manufacturing the device are significantly reduced due to the design of the constituent elements of the device. The technical result is achieved by a constricting quick-change universal device for measuring the flow of liquids and gases, including: a cylindrical body, consisting of two parts with branch pipes, each two inner diameters of the pipeline, connected by welding, forming a slot-like window in which the measuring diaphragm is placed; a conical cage that closes and seals a slit-like window, characterized in that each body of the unit has averaging chambers and holes to which pipes for pressure sampling are welded, the diaphragm is fixed in the body through a sealing ring by clamping studs with cap nuts, the cone cage is pressed against the body devices with tie bolts, guides with a stop are installed on the body, there are two diametrically located grooves on the cone cage, designed to install removable levers for displacing the cone cage from the working position when the slit-like window is opened, in one part of the assembly body there are two diametrically located holes with threads designed to screw in the ejector bolts in case of difficulties when moving the cone holder. 3 ill.

Description

The utility model relates to measuring technology and is designed to measure the flow of gases and liquids by the method of variable pressure drop.

A diaphragm input device for measuring flow is known (patent SU 951075 A. 08/15/1982), containing a welded housing with pressure sampling chambers, separated by a removable diaphragm and a transverse slit-like window for extracting and installing the measuring diaphragm, sealing gaskets with a sealing self-sealing cover in the form of a half ring placed inside the housing with the ability to move around the circumference.

The design of the device makes it possible to extract and install the measuring diaphragm into the body of the device without disconnecting the pipeline.

The disadvantages of the device are the dependence of the design and geometric dimensions on the pressure of the working medium, the complexity of the design and significant costs associated with the manufacture of the device.

The designs of the measuring unit are known, when the narrowing devices, the geometric characteristics and conditions of use of which are regulated by the standard (GOST 8.586.2-2005 (ISO 5167-2:2003)), are installed in the flange connections of the measuring pipeline, both directly and through the averaging chambers.

The disadvantages of these designs are:

1) Extraction and installation of the measuring orifice requires a pipeline connector, which causes significant costs for such work.

2) The design and geometrical dimensions of flange connections and averaging chambers are directly dependent on the working pressure of the medium and the internal diameter of the pipeline.

3) The internal diameters of the flanges and averaging chambers refer to the section of the measuring pipeline immediately adjacent to the measuring orifice, two internal diameters long, to which paragraphs 6.4.1; 6.4.2 GOST 8.586.2-2005 imposes special requirements for the roundness and cylindricity of the inner surface of the measuring pipeline.

From points 2 and 3 it follows that all parts of the design of the measuring unit require individual manufacture, and make it impossible, if necessary, to use this design on another pipeline with a different working pressure and internal diameter.

Such structures cannot be mass-produced, which significantly increases the cost of their production and subsequent operation.

The objectives of the utility model are:

1. creation of a narrowing quick-change universal device that can be used on any pipeline with a working pressure of the measured medium up to 10 MPa and allows the removal and installation of the measuring diaphragm into the device body without a measuring pipeline connector;

2. the possibility of serial production of the device body for each conditional diameter of the pipeline;

3. Reducing the metal consumption and reducing the labor intensity of manufacturing the device case.

The technical result is achieved as follows:

1. For nozzles, pipes are used with a length of two internal diameters of the pipeline and a wall thickness that allows the device to operate at a medium pressure of up to 10 MPa.

2. The size of the internal diameter of the device body is a constant value for each nominal diameter of the pipeline.

3. The inner diameter of each part of the body with a branch pipe is made by boring, which makes it possible to meet the requirements of paragraphs 6.4.1; 6.4.2 GOST 8.586.2-2005, according to the roundness and cylindricity of the inner surface of the measuring pipeline, in the factory.

4. The conical cage, fixed with bolts, closes and seals the slit-like window through which the measuring diaphragm is removed and installed into the device body and removes part of the axial load from the weld, since due to the groove for entering the diaphragm, parts of the device body are welded not across the entire diameter.

5. Reducing the metal consumption and reducing the complexity of manufacturing the device is achieved by the design of the constituent elements of the device.

The essence of the utility model is illustrated by drawings (Fig. 1; 2; 3).

The device for measuring flow in pipelines contains a cylindrical body, consisting of two parts A and B, interconnected by welding, forming a slit-like window 13, designed to extract and install the diaphragm 5. Part of the body A consists of a half of the body of the assembly for placing the diaphragm 1 and branch pipe 3, two of its inner diameters long, interconnected by welding. Part of body B consists of half of the body of the unit for placing the diaphragm 2 and branch pipe 4, two of its inner diameters long, interconnected by welding. In each case of assembly 1 and 2 there are averaging chambers 11 and openings to which pipes for pressure extraction 12 are welded. In the case of assembly 2 there is a groove for obtaining a slit-like window. Diaphragm 5 is placed in the body of the device through a slot-like window 13 and fixed in the body through a sealing ring 6 by clamping pins 7 with cap nuts 14. part of the axial load from the weld connecting parts A and B. Guides with a stop 10 are installed on the body, designed to prevent distortions when moving the cone clip 8 and serving, at the same time, as a stop for the maximum allowable movement of the cone clip 8 when opening the slit-like window 13. On The conical cage 8 has two diametrically located grooves 15 designed to install removable levers for displacing the conical cage 8 from the working position when the slot-like window 13 is opened. in case of difficulties when moving the cone holder 8 to open the slot-like window 13.

To install the device in a measuring pipeline with a specific working pressure of the measured medium, it is sufficient to install flange connections corresponding to this working pressure at the outer ends of the nozzles of the device.

The device works as follows.

To extract the diaphragm 5 from the body of the device, unscrew the bolts 9, insert the levers into the grooves of the cone holder 15 and push the cone holder 8 along the guides 10 until it stops, opening the slot-like window 13 and creating access to the seals 6, unscrew the clamping pins 7 and remove the diaphragm 5. To Installing the diaphragm in the body of the device, carry out all operations in the reverse order. In cases where there are difficulties in shifting the clip 8, you should use ejector bolts that are screwed into the threaded holes 16 in the body 1 and make it possible to significantly facilitate the process of shifting the conical clip 8 from the working position.

The technical result is the creation of a device, the design of which retains the ability to extract and install the measuring diaphragm without disconnecting the pipeline and the device body, for each conditional diameter of the pipeline, has a single design and geometric dimensions, which allows the device body to be mass-produced and the device to be installed on any pipeline with operating pressure up to 10 MPa. The metal consumption and labor intensity of manufacturing the device is significantly reduced due to the design of the constituent elements of the device.

Claims (1)

A narrowing quick-change universal device for measuring the flow of liquids and gases, including: a cylindrical body, consisting of two parts with nozzles, each two inner diameters of the pipeline, connected by welding, forming a slot-like window in which the measuring diaphragm is placed; a conical casing that closes and seals the slit-like window, characterized in that each body of the unit has averaging chambers and holes to which pipes for pressure sampling are welded, the diaphragm is fixed in the body through the sealing ring by clamping studs with cap nuts, the cone casing is pressed against the body devices with coupling bolts, guides with an emphasis are installed on the body, there are two diametrically located grooves on the cone cage, designed to install removable levers for displacing the cone cage from the working position when the slit-like window is opened, in one part of the assembly body there are two diametrically located threaded holes, designed for screwing in ejector bolts in case of difficulties when moving the cone clip.

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