WO2011079820A1

WO2011079820A1 - Hyperboloid balance flowmeter

Info

Publication number: WO2011079820A1
Application number: PCT/CN2010/080606
Authority: WO
Inventors: 周人
Original assignee: 上海科洋科技发展有限公司
Priority date: 2009-12-31
Filing date: 2010-12-31
Publication date: 2011-07-07
Also published as: CN101750121B; CN101750121A

Abstract

A hyperboloid balance flowmeter comprises a pipeline piece (01) and an internal throttling piece (02) mounted on the internal wall of the pipeline piece (01). The guide flow surface (03) of the internal throttling piece (02) is a cambered surface. The resistance of the flowmeter to fluid is reduced and the measuring precision is improved.

Description

Hyperbolic balance flowmeter

Technical field

The invention belongs to the field of machinery, in particular to a device for measuring fluid flow in a pipeline. Background technique

The existing standard orifice flowmeter is a throttling differential pressure flow measuring device composed of a standard orifice plate and a differential pressure transmitter. It can measure the flow of gas, steam, liquid and natural gas, and is widely used in petroleum and chemical industry. Process control and flow measurement in the fields of metallurgy, electricity, heat supply, water supply, and steam supply, with the largest number of uses.

The working principle of the orifice flowmeter is to add a orifice throttling device in the pipeline filled with the fluid flowing through the pipeline, causing edge shrinkage near the orifice throttling element, increasing the flow velocity, and generating a static pressure difference on the upper and lower sides thereof. Under the condition of known operating conditions, the flow rate can be obtained by deriving the relationship between differential pressure and flow according to the principle of flow continuity and Bernoulli's equation.

At present, the conventional orifice plate throttling device is used, and its structure is simple, but the sudden contraction of the fluid by the edge throttling brings an insurmountable dead zone effect:

1. The measurement range ratio is very limited, about 4:1;

2. The differential pressure signal is noisy, resulting in low measurement accuracy and repeatability;

3. Orifice plate throttling will make the flow field irregular, requiring a long straight pipe section rectification;

4. When the pipeline is set horizontally, the impurity flow at the lower end of the orifice plate does not pass, and it is easy to accumulate and change the cross-sectional area of the pipeline, which is not suitable for measuring dirt, impurities and viscous medium;

5. The eddy current on the plate and downstream causes kinetic energy loss, permanent pressure loss is large, and energy is wasted;

6. The inner edge of the orifice of the orifice plate is thin and easy to wear, resulting in measurement error and shortening the service life;

7. The installation site is prone to assembly deviation, wrong direction, and increased maintenance;

8. For fluids whose volume is easily affected by temperature and pressure, the sudden contraction and throttling of the orifice plate will bring the flow cross-sectional area in the dead zone to be unstable, which will cause a large superposition error on the differential pressure signal, and the fluid near the critical state is very It is easy to cause phase change and cause measurement disorder. There is a conical flowmeter, which measures the flow rate by placing a circular cone in the center of the fluid pipeline. It can also solve the problem of viscous medium and impurity blockage, and has a symmetrical structure, which can narrow the straight pipe section, but the tail of the cone is turbulent. There are many rogues, relatively large pressure loss, and there are defects in structural safety hazards. Therefore, pipeline flow measurement engineering requires such a hyperbolic annular structure, balanced flow line contraction, and release of a throttling flow meter. Compared with traditional orifice flowmeters and conical flowmeters, the hyperbolic balance flowmeter has the most stable fluid flow field distribution, which causes the fluid to be affected by internal components to minimize the variation of flow area and temperature and pressure. The phase separation change can not only reduce the throttling, but also rectify the ground, greatly improve the measurement accuracy and repeatability, reduce the permanent pressure loss, shorten the requirements of the straight pipe section, and expand the measurement range ratio. Impurities can be easily passed. Integrating the advantages of the orifice flowmeter and the wedge flowmeter and the cone flowmeter, the disadvantages are basically overcome, which is a great technological innovation.

Summary of the invention

The object of the present invention is to provide a flow meter which can minimize the influence of changes in fluid temperature and pressure on the internal components of the flowmeter, and reduce the momentum loss generated by the fluid collision flowmeter. Thereby providing more accurate and effective measurement data.

The object of the present invention is achieved by using a flow meter including a pipe member 01, an in-tube throttle member 02, and an in-pipe throttle member 02 mounted on the inner wall of the pipe member 01. The in-pipe throttle member 02 is the same as the pipe member 01. The shaft arrangement is characterized in that the flow guiding surface 03 of the in-tube throttle member 02 is a curved surface, which is a circular arc surface, which is a hyperboloid, and the flow guiding surface 03 is symmetrical along its own axis.

The invention has the advantages that since the flow guiding surface 03 of the in-tube throttle member 02 of the flow meter adopts a curved surface, in particular, a hyperboloid is adopted, the in-tube throttle member 02 functions as an internal throttle ring, and the guiding arc surface pole The large reduction of the momentum loss caused by the current collision of the orifice plate or the docking wedge flowmeter greatly reduces the resistance of the flowmeter to the fluid, so that the entire flowmeter can measure the data more accurately and efficiently. According to the structure of the flowmeter of the present invention, it can also be called a hyperbolic balance flowmeter, which is a great technical innovation compared with the conventional orifice flowmeter, which can keep the flow medium in the pipeline from generating two phases when flowing. The separation changes greatly improve the measurement accuracy. DRAWINGS

Figure 1 is a structural explanatory view of a flow meter of the present invention,

Figure 2 is a further explanatory view showing the structure of the flow meter of the present invention,

Fig. 3 is an explanatory view showing an embodiment of the flowmeter of the present invention, which is referred to as an integral welding type embodiment. Figure 4 is an illustration of an embodiment of a flow meter with flanged port in accordance with another embodiment of the flow meter of the present invention. Figure 5 is a third embodiment of the flow meter of the present invention, and is an explanatory view of an embodiment of a pipe in-line type. Fig. 6 is a view showing a fourth embodiment of the flowmeter of the present invention, which is a flange-clip type embodiment.

detailed description

The flow meter of the present invention may be referred to as a hyperbolic balance flow meter according to the structure, the flow meter being installed into a passage through which a fluid passes to cross the pipe, or to be installed in two flanges connecting two adjacent pipes. , through the hole in the flange, communicate with the pipe.

The structural features of the flow meter of the present invention will be further described in detail below with reference to the accompanying drawings.

The structure of the flowmeter of the present invention belongs to a differential pressure orifice flowmeter, and the structure of the differential pressure orifice flowmeter is well known to those skilled in the art. Therefore, only a longitudinal sectional view of the structure of the flowmeter of the present invention is shown here. , to be explained.

Referring to Fig. 1, Fig. 1 is a structural explanatory view of a flowmeter of the present invention, which is a longitudinal sectional view. As previously mentioned, the figure shown, also referred to as the flow meter core, is the core component of the flow meter, the flow meter core is indicated by the reference numeral 1, and the figure is directly used in Figures 4 and 5. The structure is denoted by reference numeral 1. The flowmeter core comprises a pipe member 01, an in-pipe throttle member 02, and an in-pipe throttle member 02 is mounted on the inner wall of the pipe member 01, and the pipe throttle member 02 and the pipe member 01 Coaxial setting, the in-tube throttle 02 and the pipe member 01 are coaxially arranged with the central longitudinal axis XX of the pipe of the pipe member 01 as an axis.

The in-tube throttling member 02 is a flange protruding from the annular tube, and has a hole in the center. The in-tube throttling member 02 functions as an orifice plate of the orifice flowmeter, and the diameter of the central hole is usually represented by d, and the in-tube throttling member 02 The nominal diameter of the outer annular surface is generally the same as the inner diameter of the pipe member 01, indicated by D. The fluid flows from one end of the pipe member 01, flows through the inner surface of the throttle member 02, and flows through the center hole d. It flows out from the other end of the pipe member 01.

As shown in the figure, the inner surface of the in-tube throttle member 02 in the present invention is referred to as a flow guiding surface 03, which is a three-dimensional curved surface. The figure shows that the cross section of the flow guiding surface 03 is an arc, and the arc has a symmetry. The axis ZZ, this feature is expressed as the flow guiding surface 03 of the in-tube throttle member 02 is symmetrical along its own axis. The intersection of the axis of symmetry ZZ and the arc of the section of the flow guiding surface 03 is denoted by B. In the sectional view, the section line EE of the inner tube surface of the pipe member 01 is a line parallel to the central longitudinal axis XX of the pipe. The intersection of the arc of the cross section of the flow guiding surface 03 and the section line EE of the inner tube surface of the pipe member 01 is denoted as the edge point A, and the angle C between the straight line AB connecting the A and B and the section line EE of the inner pipe surface is C. It can also be regarded as the angle C formed between the straight line AB and the central longitudinal axis XX of the pipe. In the present invention, the angle of the angle C is selected between 30 degrees and 60 degrees.

The balance flowmeter of the arc surface including the hyperboloid or the like of the present invention has an axisymmetric structure, like a horizontally placed hourglass. The area enclosed by the flow guiding surface 03 of the in-tube throttle member 02 and the inner tube surface of the pipe member 01 is a solid body.

Referring to Fig. 2, Fig. 2 is a further explanatory view showing the structure of the flowmeter of the present invention, which is a structure in which the pipe member 01 and the in-pipe throttle member 02 are integrated into one body. In the structure of Fig. 1, the pipe member 01 and the pipe are inside. The throttle member 02 is two separate components, that is, two components, or two components, which are separately formed. In this example, the pipe member 01 and the in-tube throttle member 02 are an integral structure, which is a piece of material. The integrated component is processed as a component, for example, integrally cast by precision casting, or integrally formed by machining using a single piece of material. The other structure is the same as that of Fig. 1, and the reference numerals are correspondingly marked with the flow guiding surface 03 and the like, which are identical to the main body structure shown in Fig. 1.

The structures shown in Figs. 1 and 2 are all part of the present invention. In the following embodiments, although only one of the above structures is used for each example, it is explained here that the above two structures are suitable for the following implementations. example.

Referring to Figure 3, Figure 3 is an illustration of an embodiment of a flow meter of the present invention, referred to as an integral welded embodiment. The main structure of this embodiment is the same as that shown in Fig. 1, i.e., the middle portion is the same as that of Fig. 1, and some structural features are added. The figure shows that, in order to measure the pressure difference, the pipe member 01 is provided with a left pressure tapping hole 04 and a right pressure tapping hole 05, which are through holes in the pipe wall of the pipe member 01, usually small round holes, or It is a small round hole with internal thread for mounting the measuring instrument, left pressure hole 04 and right pressure hole 05 Do not set on both sides of the in-tube throttle 02, and leave the in-tube throttle 02 slightly. Generally, the left pressure tapping hole 04 and the right pressure tapping hole 05 disposed on both sides of the in-tube throttle member 02 are symmetrically disposed with respect to the in-tube throttle member 02.

In order to connect with the outer pipe, in the flow meter of this embodiment, the welded parts 08, 09 are opened at both ends of the pipe member 01, and are used for welding with the outer pipe. The weld ports 08, 09 can be in the form of any weld joint suitable for butt weld connections, for example, a slope weld.

The way in which the in-tube throttle member 02 is mounted and fixed in the pipe member 01 is in-line or welded. The structure of this embodiment is usually of the welded type, and can also be manufactured as a pipe in-line type.

The flow meter of the structure of this embodiment is a complete, directly usable structure.

Referring to Figure 4, there is shown an illustration of an embodiment of a flow meter with a flange of another embodiment of the flow meter of the present invention.

The structure of the embodiment is basically the same as that of the embodiment of FIG. 3, and the port structure is mainly distinguished at both ends. In order to connect with the outer pipe, the flowmeter of the embodiment has no welded joint at both ends of the pipe member 01, and It is constructed as a flange, including a left flange port 06 and a right flange port 07, and a left flange port 06 and a right flange port 07 are respectively disposed at both ends of the pipe member 01 for external use. The pipes are connected by flanges.

In the structure of this embodiment, similarly, there are further included a left take-up hole 04 and a right take-up hole 05, and the left take-up hole 04 and the right take-up hole 05 are respectively disposed on both sides of the in-tube throttle member 02. Generally, the left take-up hole 04 and the right take-up hole 05 provided on both sides of the throttle member 02 in the tube are symmetrically arranged with respect to the in-tube throttle member 02.

Similarly, in the structure of the embodiment, the means for installing and fixing the throttle member 02 in the pipe member 01 may be in-line or welded.

Referring to Fig. 5, Fig. 5 is a third embodiment of the flow meter of the present invention, which is an explanatory view of an embodiment of a pipe in-line type. In this example, the flow meter includes a left pipe member 011, a right pipe member 012, and a flow meter core 1 , wherein

The flow meter core 1 is the same structure as shown in FIG. 1 or FIG. 2 and includes a pipe member 01 and a pipe. The inner throttle member 02, the in-tube throttle member 02 is mounted on the inner wall of the pipe member 01, and the pipe inner throttle member 02 is disposed coaxially with the pipe member 01, and the flow guiding surface 03 of the pipe inner throttle member 02 is a curved surface. The arc surface includes a circular surface and a hyperboloid.

Different from the structure of the first two embodiments, in this example, the pipe member 01 is separated from the middle, and is divided into a left pipe member 011 and a right pipe member 012, and the left pipe member 011 and the right pipe member 012 are used in cooperation with each other, and thus have the same The inner diameter D, the side portions of the left pipe member 011 and the right pipe member 012, which are respectively opposite to each other, have annular recesses 11, 12, and the depth and width of the recesses 11, 12, as shown in FIG. 1 or FIG. The flowmeter cores 1 cooperate with each other, and the flowmeter core 1 shown in Fig. 1 or Fig. 2 is embedded in the space of the annular recessed tables 11, 12, and the flowmeter core 1 is embedded in the space of the annular recessed tables 11, 12, and The conditions in the pipe in the structure of the first two embodiments are the same, and the arc surface of the flow guiding surface 03 of the in-tube throttle member 02 of the flow meter core 1 is flat and smoothly connected to the inside of the left pipe member 011 and the right pipe member 012. Tube surface.

In this example, the left pipe fitting 011 and the right pipe fitting 012 are respectively provided with a left take-up hole 04 and a right take-up hole 05, a left flange port 06 and a right flange port 07, a left flange port 06 and The right flange port 07 is respectively disposed at the left end of the left pipe member 011 and the right end of the right pipe member 012.

After the left pipe piece 011 and the right pipe piece 012 embed the flow meter core 1 in the space of the annular recessed table 11, 12, the flow meter core 1 is centered, disposed in the middle of the left pipe piece 011 and the right pipe piece 012, left The pipe member 011 and the right pipe member 012 are welded together and constructed as a complete flow meter.

Further, as described above with reference to FIG. 1 and FIG. 2, the inner apex B of the longitudinal section of the arc surface of the flow guiding surface 03 of the in-tube throttle member 02 and the line AB of the edge point A of the same section, and the axis XX of the pipe member 01 The angle of the formed angle C is selected between 30 degrees and 60 degrees, and the pipe member 01 and the in-tube throttle member 02 are two separate components, or an integral structure, which is an integral component processed from a piece of material. Since the structure is clear, reference numerals regarding angles are omitted from the drawings.

Referring to Figures 6, Figure 6 is a fourth embodiment of the flow meter of the present invention, which is an illustration of a flange-on-clip embodiment.

The structure of Fig. 6 is a modified structure which is formed by combining the features of the above embodiments. It is a structure in which the large structure is decomposed into small structures and combined to form a complete product. The flow meter shown includes a flow meter core 1, a left flange outer tube body 21, a right flange outer tube body 22, a left flange 31, a right flange 32, a plurality of fasteners 6, two pads Slice 7, of which

The flow meter core 1 is the same structure as shown in FIG. 1 and includes a pipe member 01, an in-tube throttle member 02, and an in-tube throttle member 02 mounted on the inner wall of the pipe member 01. The pipe inner throttle member 02 is the same as the pipe member 01. The shaft is arranged, the flow guiding surface 03 of the in-tube throttle member 02 is a curved surface, and the curved surface includes a circular arc surface and a hyperboloid.

Further, similarly, as described above with reference to FIG. 1 and FIG. 2, the inner apex B of the longitudinal section of the curved surface of the flow guiding surface 03 of the in-tube throttle member 02 and the line AB of the edge point A of the same section, and the pipe member 01 The angle of the angle C formed by the axis XX is selected between 30 degrees and 60 degrees. The pipe member 01 and the in-tube throttle member 02 are two separate components, or an integral structure, which is processed from a piece of material. The integral part, due to the clear structure, the reference numerals regarding the angle are omitted from the drawing.

The left flange outer tube body 21 and the right flange outer tube body 22 are both short tubes and a disc having a disc at one end thereof, and the disc is provided with a flange connecting hole 4, a flange The connecting hole 4 is usually a circular through hole for connecting with an outer pipe, and the inner diameter D of the short pipe is selected as needed.

The left flange 31 and the right flange 32 are both flanged structures, one end is a pipe end, and the other end is a disk end, and a flange receiving hole 5 is respectively opened on the disk, and the flange is taken The pressing hole 5 is a thin through hole, and the inner holes of the flanges 31, 32 also adopt the inner diameter D, which is the same as the inner diameter D of the short tube.

The non-disc end of the left flange outer tube body 21 and the tube end of the left flange 31 are coaxially connected, the non-disc end portion of the right flange outer tube body 22 and the tube end of the right flange 32 The same shaft connection, usually made of welded joints, is made separately.

The structure assembly sequence is from left to right, the connecting piece of the left flange outer tube body 21 and the left flange 31, using the disc end, a piece of the spacer 7, and then connecting the flowmeter core 1 and then a spacer 7. The assembly is completed by using a plurality of fasteners 6, which are connected to the end of the connecting piece of the outer flange 22 and the right flange 32 of the right flange.

The structural assembly sequence can also be from right to left, the overall structure, the total structure, no difference.

That is to say, the embodiment is realized in such a manner that the flowmeter core 1 is, for example, a hyperbolic balance flowmeter core 1, and the double curved balance flowmeter core 1 is sandwiched between the left flange 31 and the right flange 32 used in pairs. Between the two ports of the hyperboloid balance flow meter core 1 respectively correspond to the two flanges on both sides The port of the inner hole, that is, the port, just the port of the left and right flanges is stuck to the periphery of the port of the hyperboloid balance flow meter 1, 7 is a gasket, to prevent the fluid from overflowing, the spacer 7 is placed at their interface That is, the spacers 7 are disposed on the left and right sides of the flowmeter core 1, so that the flowmeter core 1 can be sealingly connected to the two flanges 31, 32. The two flanges 31, 32 are fixed by fasteners 6. The two flanges 31, 32 are in a symmetrical state on both sides of the hyperboloid balance flow meter 1, and two symmetric or a plurality of symmetrical pressures are set in the vicinity of the flowmeter core 1 and in the upward direction of the flange. The hole 5 meets the measurement needs, and an external sensor or the like can be used. 4 is the flange nut hole, which is used to connect other adjacent flanges.

The connection method of the double curved balance flowmeter 1 of this embodiment is a bayonet type, does not need to be welded, and is convenient to install and free to exchange.

The flowmeter of the present invention can be called a hyperbolic balance flowmeter when a hyperboloid is used according to the structure, particularly the core structure.

Claims

Claim

1. A flow meter comprising a pipe part (01), an in-pipe throttling element (02), an in-pipe throttling element (02) mounted on an inner wall of the pipe part (01), a pipe throttling piece (02) and a pipe piece (01) Coaxial arrangement, characterized in that the flow guiding surface (03) of the in-tube throttle (02) is a curved surface.

The flow meter according to claim 1, characterized in that the flow guiding surface (03) of the throttle (02) in the tube is a circular arc surface.

3. The flow meter of claim 1 wherein the flow guiding surface (03) of the in-tube throttle (02) is a hyperboloid.

4. A flow meter according to claim 1, characterized in that the flow guiding surface (03) of the throttle (02) in the tube is symmetrical along its own axis.

The flowmeter according to claim 1, characterized in that the inner vertex B of the longitudinal section of the arc surface of the flow guiding surface (03) of the inner throttle member (02) is connected to the edge point A of the same section. AB, the angle of the angle C formed by the axis XX of the pipe member (01) is selected between 30 degrees and 60 degrees.

6. The flow meter according to claim 1 or 5, further comprising a left take-up hole (04) and a right take-up hole (05), a left take-up hole (04) and a right take-up hole ( 05) respectively set on both sides of the throttle (02) in the tube, and set the left pressure tap (04) and the right pressure tap (05) on both sides of the throttle (02) in the tube relative to the throttle inside the tube (02) is a symmetric setting.

7. The flow meter according to claim 1 or 5, characterized in that the in-pipe throttle (02) is fixed in the pipe member (01) by means of a pipe in-line type, or a welded type, or an inner tube section. The flow piece (02) and the pipe piece (01) are a unitary structure and are an integral part machined from a single piece of material.

8. The flow meter according to claim 1, wherein the pipe member (01) is provided with welded joints (08, 09) at both ends thereof for welding with the outer pipe, or a pipe member ( 01) Both ends are provided with left flange port (06) and right flange port (07), left flange port (06) and right flange port (07) are respectively set in the pipe fitting (01) Both ends are used to connect the outer pipe with a flange.

A flow meter, comprising: a left pipe member (011), a right pipe member (012), and a flow meter core (1), wherein

The flowmeter core (1) comprises a pipe part (01), a pipe inner throttle piece (02), and a pipe inner throttle piece (02) Installed on the inner wall of the pipe fitting (01), the throttle (02) and the pipe fitting (01) are coaxially arranged, and the flow guiding surface (03) of the throttle (02) in the pipe is a curved surface, arc The surface includes an arc surface, a hyperboloid, a line connecting the inner vertex B of the longitudinal section of the arc surface of the flow guiding surface (03) of the in-tube throttle (02) and the edge point A of the same section, and the pipe part (01 The angle of the angle C formed by the axis XX is selected between 30 degrees and 60 degrees, and the pipe member (01) and the pipe throttle member (02) are two separate components, or an integral structure, which is composed of one piece. An integral part of the material,

The left pipe member (011) and the right pipe member (012) are used in cooperation with each other, and have the same inner diameter D, and are respectively opened at the side positions where the left pipe member (011) and the right pipe member (012) cooperate with each other. There are annular recesses (11, 12), depths and widths of the recesses (11, 12) which cooperate with the size of the flow meter core (1), the flowmeter core (1) being embedded in the ring In the space of the recessed table (11, 12), after the flowmeter core (1) is embedded in the space of the annular recessed table (11, 12), the flow guiding surface of the in-tube throttle (02) of the flowmeter core (1) (03) The curved surface is flat and smoothly connected to the inner tube surface of the left pipe member (011) and the right pipe member (012).

The left pipe fitting (011) and the right pipe fitting (012) are respectively provided with a left pressure tapping hole (04) and a right pressure tapping hole (05), a left flange port (06) and a right flange port (07). , the left flange port (06) and the right flange port (07) are respectively disposed at the left end of the left pipe member (011) and the right end of the right pipe member (012).

After the flow tube core (1) is embedded in the space of the annular recess (11, 12) in the left pipe piece (011) and the right pipe piece (012), the flow meter core (1) is centered and disposed on the left pipe piece ( 011) In the middle of the right pipe (012), the left pipe (011) and the right pipe (012) are welded together and constructed as a complete flow meter.

10. A flow meter, characterized in that the flow meter comprises a flowmeter core (1), a left flange outer tube body (21), a right flange outer tube body (22), and a left flange ( 31), right flange (32), several fasteners (6), two pieces of gasket (7), among them,

The flowmeter core (1) includes a pipe part (01), an in-pipe throttling piece (02), and an in-pipe throttling piece (02) mounted on the inner wall of the pipe part (01), the pipe inner throttle piece (02) and the pipe piece (01) Coaxial setting, the flow guiding surface (03) of the throttle (02) in the tube is a curved surface, the curved surface includes a circular surface, a hyperboloid, and the flow guiding surface (03) of the throttle (02) in the tube The angle between the inner apex B of the longitudinal section of the curved surface and the edge AB of the edge point A of the same section, and the angle C formed by the axis XX of the pipe member (01) is at Between 30 degrees and 60 degrees, the pipe member (01) and the pipe throttle (02) are two separate components, or an integral structure, which is an integral part processed from a piece of material.

The left flange outer tube body (21) and the right flange outer tube body (22) are short tubes and a disc is disposed at one end of the short tube, and the disc has a flange connecting hole ( 4), the flange connection hole (4) is usually a circular through hole for connecting with the outer pipe, and the inner diameter D of the short pipe is selected as needed.

The left flange (31) and the right flange (32) are all flanged structures, one end is the pipe end, and the other end is the disk end, and the flange is respectively opened on the disk (5 ), the flange pressure tapping hole (5) is a thin through hole, and the inner hole of the flange (31, 32) also adopts the inner diameter D, which is the same as the inner diameter D of the short tube.

The non-disc end of the outer flange of the left flange (21) is connected to the same end of the tube of the left flange (31), and the non-disc end of the outer flange of the right flange (22) and the right method The tube ends of the blue plate (32) are connected by the same shaft, usually by welding connection, and are respectively made into one body.

The structure assembly sequence is from left to right, the connection piece of the left flange outer tube body (21) and the left flange plate (31), using the disk end, a piece of gasket (7), and then connected to the flowmeter core ( 1), then connect another piece of gasket (7), and then use several fasteners (6) to connect the end of the connecting piece of the right outer flange body (22) and the right flange (32) , complete the assembly.