A PRESSURE FLUCTUATION DAMPER FOR A METERING INSTRUMENT AND A METHOD FOR MOUNTING THE SAME

Abstract

A pressure fluctuation damper for a metering instrument (10) located at an end of a pulse tube (9), which comprises a generally elongated cylindrical element (2) comprising one or more intake throttling channels (4) in fluid communication with the pulse tube (9) and one or more outlet damping channels (5) in fluid communication with the metering instrument (10), the elongated cylindrical element (2) being equipped with an end face thrust element (3) located coaxially to the pulse tube (9), the diameter of the elongated cylindrical element (2) being smaller than the inner diameter of the pulse tube (9) and the diameter of the end face thrust element (3) being larger than the inner diameter of the pulse tube (9); and a method for mounting the pressure fluctuation damper.

Claims

1. A pressure fluctuation damper for a metering instrument located at an end of a pulse tube, comprising a generally elongated cylindrical element comprising one or more intake throttling channels in fluid communication with the pulse tube and one or more outlet damping channels in fluid communication with the metering instrument, characterized in that the elongated cylindrical element is equipped with an end face thrust element located coaxially to the pulse tube wherein the diameter of the elongated cylindrical element is smaller than the inner diameter of the pulse tube and the diameter of the end face thrust element is larger than the inner diameter of the pulse tube.

2. The pressure fluctuation damper for a metering instrument according to claim 1, wherein the elongated cylindrical element outer surface is provided with one or more annular grooves.

3. The pressure fluctuation damper for a metering instrument according to claim 1, wherein the elongated cylindrical element outer surface is provided with a helical groove.

4. The pressure fluctuation damper for a metering instrument according to claim 1, wherein the outlet damping channel is divided with one or more partitions into chambers being in fluid communication with each other by means of one or more through channels provided in the partition.

5. A method for mounting the damper according to claims 1-4, wherein the elongated cylindrical element is placed inside the pulse tube, and the end face thrust element is clamped between surfaces of the pulse tube and the metering instrument which are connected.

6. The method for mounting the pressure fluctuation damper for metering instruments according to claim 5, wherein the end face thrust element is clamped between the surfaces of the pulse tube and the metering instrument which are connected and fixed with a flanged connection, or a threaded connection, or a clamped connection.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0013] The solution as claimed is explained by means of the following drawings.

[0014] FIG. 1 is a general view of a pressure fluctuation damper for a metering instrument.

[0015] FIG. 2 is a longitudinal section view of a pressure fluctuation damper for a metering instrument.

[0016] FIG. 3 is a cross section view of a pressure fluctuation damper for a metering instrument in plane A-A.

[0017] FIG. 4 is a longitudinal section view of a pressure fluctuation damper for a metering instrument in the mounted state.

DESCRIPTION OF EMBODIMENTS

[0018] FIGS. 1-3 show a pressure fluctuation damper (1) for a metering instrument, comprising a generally elongated cylindrical element (2) equipped with an end face thrust element (3), comprising one or more intake throttling channels (4) (FIGS. 2 and 3) in fluid communication with a pulse tube (not shown in the figures) and one or more outlet damping channels (5) in fluid communication with the metering instrument (not shown in the figures). The elongated cylindrical element (2) outer surface is provided with a helical groove (6) in communication with one or more annular grooves (7), in their turn, being in communication with the inlet (8) of the intake throttling channel (4).

[0019] FIG. 3 is a cross section view of the damper in plane A-A.

[0020] FIG. 4 shows the damper in the mounted state, wherein its generally elongated cylindrical element (2) is placed inside the inner channel of the pulse tube (9), and the end face thrust element (3) is clamped with the end face surface of the pulse tube (9) to the end face surface of the connecting pipe of the monitoring and metering instrument (10) and fixed by means of coupling nut (11). In the embodiment of the invention as shown the outlet damping channel (5) is divided with partitions (12) into chambers (13), being in fluid communication with each other and the damping channel by means of through channels (14) provided in the partitions.

INDUSTRIAL APPLICABILITY

[0021] The solution as claimed is implemented as follows.

[0022] Thanks to its diameter being smaller than the inner diameter of the pulse tube (9) the elongated cylindrical element (2) of the pressure fluctuation damper (1) for the metering instrument (10) is inserted into its inner channel, the insertion depth being limited due to the presence of the end face thrust element (3), the diameter of which is larger than the inner diameter of the pulse tube (9). The end face thrust element (3) is clamped with the end face surface of the pulse tube (9) to the end face surface of the connecting pipe of the monitoring and metering instrument (10) and fixed, for example, by means of coupling nut (11), with only one unit connecting the MMI and the mainline being formed in this case.

[0023] The effective damping of fluctuations and pulsations of the fluid during its transfer to the monitoring and metering instrument (10) by means of the mounted damper (1) is carried out by passing the fluid through the channel formed by the walls of the inner channel of the pulse tube (9) and the helical groove (6) being, in its turn, in communication with the annular groove (7) through the intake throttling channels (4) to the outlet damping channel (5). Further, the energy of the working fluid fluctuations and pulsations is damped by means of the effects of changing the direction of the pulsation propagation in a rotary mixing chamber, the interaction of the working fluid streams when mixing, throttling into the chamber, through the intake throttling channels (4), swirling and due to the variable diameter of the outlet damping channel (5), through which it passes to the monitoring and metering instrument (10). The swirling effect is achieved when the fluid is fed into the outlet damping channel (5) through several intake throttling channels (4) oppositely directed inside it, and the variable diameter is arranged by means of formation of chambers (13) separated with partitions (12).

[0024] Thus, a pressure fluctuation damper for a metering instrument, as well as a method for mounting the same are developed, with the optimal construction of the damper, which also determines the optimal set of operations during implementation of the method for its mounting, being aimed at achieving the technical result, which is to make the mounting easier and to perform periodic maintenance of the damper while preserving the overall dimensions of the entire controlled system in general, which, in turn, allows for increasing reliability of the measurements performed.