HU184432B - Measuring orifice chamber - Google Patents

Abstract

The present invention is a replaceable measuring flange chamber which allows rapid replacement or control of the measuring flange without breaking the measuring section. The measuring flange chamber according to the invention consists of at least two but preferably three main elements, where the post-assembly gas tightness is provided by sealing seams. The surfaces of the measuring rim chamber in contact with the measuring rim of the present invention are ground or surface-refined surfaces. In one embodiment, a dual differential plunger is incorporated into one of the extensions, in which case, in the case of a suitably formed housing, the flange can be replaced or checked without the pressure section being disengaged. -1-

Description

(57) EXTRAS

The invention relates to a removable measuring rim chamber which allows rapid replacement or inspection of the measuring rim without breaking the measuring section. The measuring rim chamber according to the invention consists of at least two but preferably three main elements, wherein the gas is sealed after installation by sealing seams. The contacting surfaces of the measuring rim chamber according to the invention are ground or surface-finishing surfaces. In one embodiment, a dual differential piston is mounted in one of the extensions, whereby, in the case of a suitably designed housing, the measuring flange can be replaced or checked without the need to split (depressurize) the measuring section.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange chamber for the accurate and easy replacement of flanges without pipeline disassembly in flange measuring systems.

A widely used device for measuring the amount of fluid flowing in closed pipelines is a flange volume measuring device, which means that a pressure difference is created between the two sides of the measuring flange, which is placed perpendicular to the flow in the flow direction and can be inferred. The pressure before and after the gauge is measured by means of so-called pressure gauges, which can be manufactured in various standard ways. Standard 15 also defines the length of the tube section before and after the flange, i.e. the measuring section, and the main geometric and surface fineness parameters of the measuring flange.

The accuracy of the measuring flange quantity is determined by ^{2 (1} point - the diameter of the measuring flange narrowing opening - the condition of the edges of the narrowing opening - the contamination of the measuring section and - the contamination of the pressure measuring tap.

Thus, the accuracy of the measurement requires periodic verification of the contamination and the condition of the edges, and a significant change in the measuring range necessitates the use of a measuring flange with another diameter of the orifice.

Conventionally, the measuring flange was clamped between flanged pipe joints, where inspection and replacement was a laborious and lengthy operation, not to mention that insertion accuracy and sealing also influenced the result. In the case of large diameters, these operations were difficult to solve by simple means under field conditions.

The design of the gauge flange chambers 40 was intended to provide a gauge section where the gauge flange and the cross-sections to be tested could be easily and quickly inspected so that the main requirement of the gauge section, i.e. uniaxiality, was maximized. 45

To meet this requirement, measuring flange chambers have been constructed in which the measuring flange is not located between screw flanged flanges but in housings embedded in the measuring section where the measuring flange is formed and when inspecting or replacing the measuring flange in said housing. shall be pulled out without breaking the measuring section.

In practice, two types of measuring rim chambers are common:

In one case, lifting the measuring flange is possible only by stopping the flow in the measuring section, that is, only after the measuring section has been cut off;

In the other case, the flow in the measuring section is sustainable, i.e., it is not necessary to say the measuring section.

Both types of measuring flange chambers are characterized in that the chamber is a welded or casting block, and the pressure release points, i.e., pressure gauge taps, are individual holes in the chamber welded or molded at a standard distance from the measuring flange 65. The formation of false flow or leakage (between the two sides of the gauge flange and the pipeline operating space and the surrounding area) that prevents the measurement from occurring is prevented by fixed gaskets in the gauge flange or enclosure.

Known design chambers are not optimally metrologically or technologically.

Metrologically, the optimum solution is the annular chamber pressure gauge tap, which is practically impossible in manufacturing applications and in other designs due to leakage problems.

In the manufacture of known gauge flange chambers, it is very difficult to form sealing and bearing surfaces, and to polish or possibly chromate these surfaces and the metrologically required 2D20 section, or other aggressive media.

SUMMARY OF THE INVENTION It is an object of the present invention to overcome the aforementioned shortcomings of the known flange chambers and to provide a flange chamber that allows a simple and accurate production of metrologically optimal flange chambers, even for average equipment operation.

The invention is based on the discovery that the chamber is only adequately shaped internally by the split design, but that the sealing and fitting surfaces do not coincide with the plane of the contact surface of the measuring flange.

SUMMARY OF THE INVENTION The object of the present invention has been solved by providing the chamber of the measuring rim chamber according to the invention with at least two parts rigidly, gas tightly but disassembled, at least a part of which is integrally connected to the other part of the chamber. its mating interface and / or sealing surface is formed in a plane outside the plane of the bearing surfaces of the measuring flange.

According to a preferred embodiment of the measuring rim chamber according to the invention, the divided chamber consists of a chamber body having a chamber opening and two tubular fittings which are fitted on both sides of the chamber body, at least one of which forms an abutment surface of the measuring rim.

In a further preferred embodiment of the invention, the tubular joints are secured to the central ventricular body by bolts arranged along their flange sealing surfaces, and the sealing surfaces are provided with a sealing ring.

However, it is also possible that the tubular joints are connected to the central ventricular body by means of threaded interface surfaces and that the outer ends of the interface surfaces are sealed with a sealing seam.

In another embodiment, the downstream first duct is connected to the central ventricular body by a threaded interface, while the second duct is connected to the central ventricular body by a smooth interface and a shoulder sealing surface fitting to its inner surface parallel to the central ventricular opening. sealed.

According to a further preferred embodiment of the invention, a stepped, piston-mounted stopper piston which is sealed on the face of the measuring flange and is fitted with medium inlet channel.

This solution allows the measuring flange to be replaced with both the flowing fluid shut-off and continuous uninterrupted operation. In the latter case, a replaceable sealing area is provided above the central part. In this case, the baffle plate or its frame can be provided with a suitably designed structure without damaging the sealing surface and the sealing ring.

If a non-stopper piston is used, in another embodiment, which also allows for the exchange of the measuring flange without branching, a cylindrical stopcock with a horizontal shaft with an opening allowing the passage of the measuring flange in the center is fitted. , is provided with a floating shaped sealing latch that conforms to the shape of a stopcock and has seals on its periphery.

Detailed Description of the Invention The present invention will be described in more detail with reference to the drawings, in which preferred embodiments of the measuring rim chamber according to the invention are shown. In the drawing, Figure 1 is a schematic, semi-sectional view of a measuring rim chamber according to the invention;

Figure 2 is a sectional view of the upper part of another measuring rim chamber according to the invention, with a pressure gauge formed on a pipe end and with fixed bearing surfaces;

Fig. 3 shows a measuring rim chamber similar to that of Fig. 2 with a ring chamber pressure gauge tap;

Fig. 4 is a longitudinal sectional view of a gauge chamber allowing the exchange of unpressurized flange with a cylindrical stopcock and a floating sealing latch;

Figure 5 is an enlarged sectional view of a floating sealing latch and a cylindrical stopcock;

Fig. 6 is a sectional view of the upper part of a measuring chamber with a stopper piston with a ring chamber pressure gauge tap;

Figures 7 (a) and (b) are a solution for moving a blocking disk or frame of a measuring chamber with a stopper piston, whereby the harmful friction of the sealing rings is eliminated.

Figure 1 shows a basic type of measuring rim chamber according to the invention, without measuring rim. As shown in the figure, the chamber housing consists of a central chamber body 1 and two tubular extensions 2 which fit thereon. The central chamber body 1 has a chamber opening 3 which allows the insertion of a measuring rim not shown in the figure, while the ends of the tube plugs 2 which are inserted into the central chamber body 1 form the fixed faces 4 of the measuring rim. The tubular joints 2 are provided with a shoulder-like flange 5 which externally abuts the central ventricular body 1, and the tubular joints 2 are joined to the central ventricular body 1 by means of screws 6 arranged in a circle. The sealing surface 7 between the two is sealed by the sealing rings 8 located in the flange 5 and the central chamber body 1. Alternatively, an embodiment is conceivable in which the central chamber body 1 and one of the tubular members 2 are integrally formed. The advantage of the solution is that the inner parts of the chamber housing, in particular the sealing and abutment surfaces, are easily accessible for machining, but the sealing problem is also easily solved since the sealing surfaces are outside the plane of the measuring rim in the measuring position.

Fig. 2 shows a detail of a measuring rim chamber in which a first tubular member 12 in the figure is connected to the central chamber body 11 by a threaded interface 13 and a second tubular member 14 'shown in the left in the direction of flow. collides with the inside of the central chamber body 11. The inner end of the threaded interface 13 facing the chamber opening 15 is sealed with an elastomeric closure 16 and the outer end 17 is sealed with a sealing seam 17. At the same time, a sealing seam 19 is provided between the tube end 12 'and the central chamber body 11 at the end of the interface 18 between the two. In the embodiment shown in the figure, the pressure gauge taps 20 are formed as individual holes equally spaced from the gauge flange. In this figure, the measuring rim 21 is shown in a condition inserted into the chamber of the chamber. A tab 22 is provided for facilitating the lifting of the measuring flange 21, while sealing rings 24 are provided in the surface (or in the measuring flange) that contacts the contacting surfaces 23.

The embodiment shown in Fig. 3 differs from the previous one only in that it has metrologically more favorable tapping of the annular chamber pressure gauge 25.

In the embodiments described, the measuring flange 21 can only be replaced when the measuring flange chamber is interrupted, i.e. there is no fluid flow. But even these solutions have the basic advantages of the invention, namely the high availability and machinability of critical surfaces and the simple and reliable provision of tightness.

Fig. 4 shows an improved version of the above embodiments suitable for replacing the measuring flange 21 with a continuous fluid flow without interruption. In this embodiment, an exchange space 26 corresponding to the size of the measuring rim 21 (or measuring rim (s)) is formed above the operating space of the measuring rim chamber, which can be hermetically sealed with a green element 27 above. Between the chamber of the measuring flange chamber and the exchange space 26, a horizontal shaft 28 is provided with a horizontal stopcock 28 in the center of which an opening 29 is provided to permit the passage of the flange 21 when properly adjusted. A so-called float-shaped sealing latch 31, which is further supported by a spring 30 and fits in the shape of a stopcock 28, is fitted to the stop pin 28 from below and has seals 32 and 33 on its outer periphery and on the surface of the stop pin 28. Movement and sealing of the measuring flange 21 (or measuring flanges) is provided in the usual manner. In this embodiment, the chamber housing is formed by attaching to the central chamber body 11 a tubular plug 12 having a threaded interface 13 on both sides, the ends of which are sealed with a sealing seam.

In this embodiment, the measuring flange 21 is replaced

184 13 'is done to equalize the pressure in the operating space and the exchange compartment 26, and after properly adjusting the stopcock 28, the measuring flange 21 is raised into the exchange compartment 26, then the stopcock 28 is rotated, i.e. the two compartments are separated. Subsequently, the replacement housing 26 is depressurized and the closure member 27 is removed. Thus, the measuring flange 21 is removable. The reinstallation is done in reverse order.

Fig. 6 shows another possible embodiment which is advantageous in comparison with the above because of its simplicity and reliability. This embodiment is formed in the chamber housing similarly (welded, cast, or forged) as in Figs.

In the embodiments shown in Figure 3, however, a first piston 34 in the downstream first right socket 12 is provided with a stopper piston 34. This stopper piston 34 is stepped and has a seal 36 on its face 35 abutting the measuring flange 21. The end face 35 forms one of the contact surfaces of the measuring rim 21. In the solution flange 21, only the other side facing the fixed contact surface 23 is provided with a sealing ring 24. The stopper piston 34 is pressed by a compression spring 37 in the same direction as the flow to the measuring rim 21 or, after removal, to the bearing surface 23, in the differential pressure in the chamber. The stopper piston 34 is surrounded by a piston housing 39 sealed with O-rings 38, the end of which is guided by a fluid inlet channel 41 in front of the outermost stair surface 40 of the stopper piston. In this embodiment, the gauge flange 21 is replaced by applying pressure to the stator surface 40 of the stopper piston 34 after depressurization or pressure equalization, so that it is pulled back against the compression spring 37 so that the gauge flange 21 can be easily removed by or easily inserted into the spacious opening. This spacious insertion opening is one of the major advantages of this embodiment, which allows only one face 23 of the measuring rim chamber to be fixed and the other to be displaced while being tightly sealed. The stopper piston 34, after removing the measuring flange 21, rests on the abutment surface 23 with its front face 35, thus allowing the flange 21 to be replaced without detaching the measuring section, provided that the measuring flange chamber has a replacement space 26.

Figures 7a and 7b illustrate a fast and safe replacement of the measuring flange 21 in the sealing piston chamber. The frame 43 provided with spacer eyes 42 ensures that the sealing ring 24 is not frictional with the abutment surface 23 when fitting the gauge flange 21 only when the spacer eyes 42 fit into the guide holes 45 of the guide rails 44. Movement of the frame 43 or the measuring flange 21 during the exchange in the measuring chamber is provided by the rack 46. Alternatively, the movement of the frame 43 or measuring flange 21 may be accomplished.

The main advantages of the measuring rim chamber according to the invention are as follows:

- allows the production of measuring flange chambers in average equipment, - grinding of sealing surfaces by simple means, - hard chroming of sealing surfaces, - simple coating of surfaces in contact with the fluid (metal spraying, leveling, etc.) which are mainly aggressive media advantageous for measuring, - simple design of the ring chamber pressure gauge tap, - use of a stopper piston seal, which in turn allows for a simple gauge chamber to ensure uninterrupted gauge exchange, - simple repair of the bearing surfaces of the gauge chamber, easy application.

Claims (7)

Patent claims 1. To ensure the accurate exchange of measuring flange chamber flanges without pipeline opening, with a chamber housing inserted into the measuring section, hermetically sealed chamber opening allowing the insertion of a measuring flange into the chamber housing, , with a hermetically sealed replacement chamber, characterized in that the chamber housing is rigidly, gas-tightly but disassembled of at least two parts (1, 11, 2, 12 or 2, 11, 12 and 12 '), of which at least one part (2) 12) is adapted to fit into a part (1,11) provided with a chamber opening (3, 15) which allows the measuring flange (21), but the first part (11, 1, 2, 12) fits into the second slot (2,12). and / or its sealing surface (7) parallel to the plane of the abutting surfaces (4, 23) of the measuring flange (21) trained on a flat plane. An embodiment of a measuring rim chamber according to claim 1, characterized in that the chamber housing is formed by a central chamber body (1, 11) comprising two chamber openings (3, 15) and two sides which fit into this central chamber body (1, 11). consisting of a tubular solution (2, 12, 12 '), the inner end of at least one of which forms the contact surface (4, 23) of the measuring flange (21) in the measuring position. An embodiment of a measuring flange chamber according to claim 2, characterized in that the tubular joints (2, 12, 12 ') are provided with screws (6) arranged along their sealing surfaces (7) in the form of a flange (5) with the central chamber body (1, 11). ) and the sealing surfaces (7) are provided with a sealing ring (8). An embodiment of a measuring flange chamber according to claim 2, characterized in that the tubular joints (12, 12 ') are connected by threaded surfaces (13) to the central chamber body (1, 11) and the outer ends of the sealing surfaces (7). are sealed with a sealing seam (17). An embodiment of a measuring flange chamber according to claim 2, characterized in that the downstream first tube end (12) is connected by a threaded surface (13) to the central chamber body (11) and the second tube end (12 ') by a smooth surface. (18) and a sealing surface bracket (14) fitting to the inner surface of the central chamber body (1, 11) parallel to the chamber opening (15) and connected to the central chamber body (1, 11). , 18) sealed from the outside with a sealing seam (17, 19). 6. In steps 2-5. An embodiment of a measuring flange chamber according to any one of claims 1 to 3, characterized in that, in the direction of flow, a first flange (21) forms a contact surface (4, 23) of the measuring flange (21), -4184432 is provided with a cylindrical locking pin (28) provided with a float-shaped sealing latch (31) clamped by a compression spring (30) to the locking pin (28) and adapted to the shape of the locking pin (28) and having circumferential seals (32, 33). ) is assigned. An embodiment of a measuring flange chamber according to claim 6, characterized in that the measuring flange (21) or its frame (43) is provided with spacer eyes (42) which fit into the orientation holes (45) of the guide rail (44). on its face surface (35) there is provided a sealed piston (34) with a seal, a flow piston (34) clamped by a compression spring (37), and in front of its outermost step surface (40) is a fluid channel for moving the piston (34) against spring force and flow. (41) is introduced. 7. An embodiment of a measuring flange chamber according to any one of claims 1 to 3, characterized in that an arrow is provided with a horizontal axis between the operating space and the exchange space (26), allowing in its center the passage of the measuring flange (21). 7 pieces of figure Published by the National Office for Inventions Published by: Zoltán Himer Head of Department Published by Technical Publisher 86-675 - Szegedi Nyomda -5 *. ! ι, - »4. NSAID: G (h 1/40