RU48221U1 - RELAXING DEVICE FOR MEASURING GAS CONSUMPTION - Google Patents

Abstract

The utility model relates to a measuring complex for volumetric gas flow, and more specifically to diaphragm-type devices for measuring gas flow at gas measuring stations of gas and gas mains and technological pipelines. The challenge facing the authors is to create a narrowing device for measuring gas flow, which allows to increase the throughput of the pipeline by reducing the time for revision of the narrowing devices and increase the tightness of the connection of the entire device. The narrowing device for measuring gas flow consists of a housing 1 (Fig. 1) with openings 2, 3 for sampling the gas pressure and a central opening 4 (Fig. 2) for transporting gas. The housing 1 is made with a through groove 5, in which a holder 6 is mounted that carries a diaphragm 7 with a calibrated hole 8. The top 1 and bottom are closed by covers 9, 10. The top 9 is pressed by the strap 11. The strap 11 and the top of the cover 9 are made the form of the connection 12 "dovetail", while the lateral edges of the strap cover the housing from the outside (Figure 3). In the lower part of the housing 1, purge holes 13 are made. Removing the holder 6 with the diaphragm 7 is carried out using the lifting mechanism 14. The diaphragm 7 is installed in the holder 6 through an O-ring seal 15. The housing 1 has nozzles 16, 17 and connecting flanges 18. At least between one of the nozzles and the housing 1 an additional connector is made in the form of a flange connection 19. As a result of the additional flange connection, the pipe 17 becomes detachable, therefore, it is easily and quickly dismantled for revisions of the internal cavity of the device, and making the connection the top cover - a U-shaped strip in the form of a “dovetail” allows you to create sufficient rigidity of the body, which prevents the opening of the groove when and pressure inside the device.

Description

The utility model relates to a measuring complex for volumetric gas flow, and more specifically to diaphragm-type devices for measuring gas flow at gas measuring stations of gas and gas mains and technological pipelines.

Known narrowing device / US patent No. 5396931, Cl. 138-44, 1993 /, comprising a housing with a removable upper cover that seals the transverse slot-like groove, and pressure selection holes, separated by a removable holder with a diaphragm, sealing elements. The lid is fixed using bursting bolts that are screwed into the bar located in the device body.

The disadvantages of the known design:

1. The large investment of time on revision of the constricting device and maintenance difficulties due to the inability to quickly visually inspect the diaphragm without removing it.

The closest solution in technical essence - the prototype is a constriction device / Patent of Russia №2129701, IPC G 01 F 1/42, published 1999 /, containing a housing with nozzles and connecting flanges, as well as openings for sampling gas pressure and a Central hole for transporting gas, made with a through groove in which a holder carrying a diaphragm is mounted. Above and below the casing is closed with covers. The top cover is fixed with a clamping plate with bolts, which is installed in the longitudinal groove of the cover. To remove the holder with the diaphragm from the housing there is a lifting mechanism. Sealing sealing elements are installed between the housing and the covers. Pipes and connecting flanges are used to attach the housing to the gas pipeline.

The disadvantages of the prototype:

1. It is impossible to audit the internal cavity of the device without disassembling the device itself, which reduces the throughput of the gas pipeline;

2. There may be gas leakage due to an increase in the groove in the transverse direction due to the fact that during operation in the device from the pressure of the gas medium, there are expanding forces that act over the entire area of the groove, increasing its size in width. Since the inner surface of the groove is in contact with the seal, the geometrical dimensions of the groove must be sufficiently accurate and changes in the geometrical dimensions of the groove, including due to the phenomenon of creep, will lead to leaks in the entire device, which also reduces the throughput of the gas pipeline.

The challenge facing the authors is to create a narrowing device for measuring gas flow, which allows to increase the throughput of the pipeline by reducing the time for revision of the narrowing devices and increase the tightness of the connection of the entire device.

The technical result is achieved by the fact that in the known narrowing device for measuring gas flow, comprising a housing closed with top and bottom covers with holes for taking gas pressure, a holder with a diaphragm, a lifting mechanism for removing from the body of the holder with a diaphragm, sealing elements, and also nozzles and connecting flanges for attaching the housing to the gas pipeline, according to the claimed solution, at least between one of the nozzles and the housing an additional connector is made in the form of a flange connection, and the top The upper part of the upper cover of the case, equipped with a U-shaped strip, and the side faces of the strip, are made in the form of a dovetail connection, while the strip covers the case from the outside.

Figure 1 shows a General view of the proposed device;

Figure 2 is a longitudinal section in figure 1;

Figure 3 is a view A in figure 2.

The narrowing device for measuring gas flow consists of a housing 1 (Fig. 1) with openings 2, 3 for sampling the gas pressure and a central opening 4 (Fig. 2) for transporting gas. The housing 1 is made with a through groove 5, in which a holder 6 is mounted that carries a diaphragm 7 with a calibrated hole 8. The top 1 and bottom are closed by covers 9, 10. The top 9 is pressed by the strap 11. The strap 11 and the top of the cover 9 are made the form of the connection 12 "dovetail", while the lateral edges of the strap cover the housing from the outside (Figure 3). In the lower part of the housing 1, purge holes 13 are made. Removing the holder 6 with the diaphragm 7 is carried out using the lifting mechanism 14. The diaphragm 7 is installed in the holder 6 through an O-ring seal 15. The housing 1 has nozzles 16, 17 and connecting flanges 18. At least between one of the nozzles and the housing 1 an additional connector is made in the form of a flange connection 19. As a result of the additional flange connection, the pipe 17 becomes detachable, therefore, it is easily and quickly dismantled for revisions of the internal cavity of the device.

A dismantling insert 21 is installed between the flange 20 and the flange 18 of the detachable pipe 17. Sealing sealing elements (not shown) are installed between the housing 1 and the covers 9, 10.

The device operates as follows.

Gas is transported under pressure through a narrowing device mounted in the measuring section of the pipeline and being part of this pipeline. Passing through a calibrated hole 8 of the diaphragm 7, the gas flow receives disturbances that lead to a pressure drop in the gas before and after the diaphragm.

The gas pressure is taken through the hole 2 in front of the diaphragm and the hole 3 located after the diaphragm and transmitted to the differential pressure gauges and

gas measuring station flow calculators recording the flow of transported gas.

If it is necessary to conduct a periodic audit or replacement of the seal 14 and the diaphragm 7, they are removed from the housing 1 together with the holder 6 using the lifting mechanism 14. To audit the internal cavity of the constricting device, only the detachable pipe 16 is dismantled instead of dismantling the entire constricting device. After revising or replacing these parts, all previous operations are performed in reverse order. In this case, the connection of the top cover - the U-shaped strip in the form of a “dovetail” allows you to create sufficient rigidity of the body, which prevents the opening of the groove when pressure appears inside the device.

Thus, the proposed narrowing device for measuring gas flow allows you to increase the throughput of the gas pipeline by reducing the time for revision of the internal cavity of the device due to the fact that during the audit it is enough to remove the pipe and repair the internal cavity of the device and the diaphragm without disassembling the device itself, as well as by increasing the tightness of the entire device.

Claims (1)

Narrowing device for measuring gas flow, comprising a housing closed with top and bottom covers with openings for taking gas pressure and a central opening for transporting gas, made with a through groove in which a holder with a diaphragm is installed, a lifting mechanism for removing a holder with a diaphragm from the housing, sealing elements, as well as nozzles and connecting flanges for attaching the housing to the gas pipeline, characterized in that at least between one of the nozzles and the housing is made additional em in a flange, and the upper portion of the upper housing cover provided with a U-shaped strip, and side faces are formed as strips compound "dovetail" with the strip covers the housing from the outside.