A differential pressure flowmeter of the balanced type with a porous element

Abstract

The present application relates to the technical fields of differential pressure flowmeter, and provides a porous balanced differential pressure flowmeter, which comprises pressing butt joint assemblies, a flow intercepting piece, a throttle plate and rotating fixing assemblies, the flow intercepting piece is detachably connected with the two pressing butt joint assemblies respectively, the pressing butt joint assemblies are used for butt joint communication with the flow intercepting piece, the throttle plate is fixedly installed in the flow intercepting piece, when the two ends of the flow intercepting piece are connected with the two pressing butt joint assemblies respectively, the two rotating fixing assemblies are rotatably and slidably connected with the two pipeline sections respectively, the rotating fixing assemblies are detachably connected with the pressing butt joint assemblies and the flow intercepting piece, the two rotating fixing assemblies are detachably connected, and the rotating fixing assemblies are used for pressing the flow intercepting piece and the pressing butt joint assemblies, so as to solve the technical problems that the throttle plate is difficult to replace and the throttle plate alignment is relatively complicated during the maintenance of the differential pressure flowmeter in the related art, and the maintenance process is relatively time-consuming.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of differential pressure flow meters, in particular to a multi-hole balanced differential pressure flow meter. BACKGROUND

[0002] The differential pressure flow meter is an instrument device for detecting the pressure of gas, liquid and other fluids flowing in the pipeline through Bernoulli's principle. The principle is to set a throttling plate with a through hole in the pipeline. When the fluid contacts the throttling plate, the fluid flowing out through the smaller diameter through hole will cause the flow rate and pressure on both sides of the throttling plate to produce a difference. The pressure is conducted through the pipe body set on both sides of the throttling plate, and the flow rate of the fluid is obtained by calculating the pressure difference. The setting of the multi-hole plate can make the fluid flowing through the throttling plate more balanced, and the average flow rate of each hole can better reflect the true flow rate, thereby measuring more accurately.

[0003] The differential pressure flow meters used in the prior art are mainly divided into welded type and flange clamping type. The throttling plate in the welded flow meter is fixedly installed on the flow cutting piece, and the flow cutting piece is directly welded on the pipeline. The flange clamping type is to clamp the flow cutting piece between the flanges to achieve installation. The above-mentioned several types of differential pressure flow meters have their own advantages and disadvantages. The welded type is difficult to maintain and replace after installation, and the flange clamping type needs to align the throttling plate with the pipeline after installation, otherwise the detection result will be deviated. In summary, the existing differential pressure flow meters have the problems of difficult replacement of the throttling plate and time-consuming alignment of the throttling plate with the pipeline after replacement. SUMMARY

[0004] To overcome the above-mentioned defects, the embodiments of the present application provide a multi-hole balanced differential pressure flow meter, which solves the technical problems of difficult replacement of the throttling plate, tedious alignment of the throttling plate, and time-consuming maintenance process in the related art.

[0005] The utility model provides a porous balanced type differential pressure flowmeter, including pipeline, lead pressure pipe, valve group, pipeline section and instrument, the pipeline section is connected with the pipeline, the valve group passes through the lead pressure pipe with the pipeline section intercommunication, the instrument is installed on the valve group, the pipeline section is divided into two sections, two lead pressure pipes are connected with two pipeline sections respectively, still include press tightly butt joint subassembly, cut off, throttle plate and rotation fixed assembly, two press tightly butt joint subassembly are rotatoryly connected on the one end of two pipeline sections respectively and each other is close, two press tightly butt joint subassembly are oppositely arranged, be provided with cut off between two press tightly butt joint subassembly, the both sides of cut off are detachably connected with two press tightly butt joint subassembly respectively, press tightly butt joint subassembly is used for butt joint intercommunication with cut off, cut off is arranged as annular, throttle plate is fixedly installed in cut off, a plurality of through -holes are evenly formed on throttle plate, when the both ends of cut off are connected with two press tightly butt joint subassembly respectively, the fluid in the pipeline can flow in the pipeline section, press tightly butt joint subassembly and cut off, two rotation fixed assembly are rotatory and slidingly connected on two pipeline sections respectively, rotation fixed assembly can detachably connect with press tightly butt joint subassembly and cut off, two rotation fixed assembly are detachably connected, and rotation fixed assembly is used for press tightly between cut off and press tightly butt joint subassembly.

[0006] when cut off is connected with press tightly butt joint subassembly, rotation fixed assembly press tightly cut off with press tightly butt joint subassembly, can make throttle plate with pipeline section alignment.

[0007] cut off includes wedge pipe, clamping groove, clamping pin and dialing strip, wedge pipe is fixedly installed with throttle plate, the both sides of wedge pipe are obliquely arranged, the inclined surface of wedge pipe can detachably connect with press tightly butt joint subassembly, a plurality of clamping grooves are circumferentially arranged on the wedge pipe, a plurality of clamping grooves are arranged on the both sides of wedge pipe, a plurality of clamping pins are fixedly connected on the oblique position of the both sides of wedge pipe, clamping pin is matched with press tightly butt joint subassembly, dialing strip is fixedly connected on the wedge pipe, and the wedge pipe can be opposite to press tightly butt joint subassembly on the side of pipeline section away from lead pressure pipe.

[0008] press tightly butt joint subassembly includes butt joint pipe, clamping groove and through groove, butt joint pipe is rotatoryly connected on the pipeline section, the side of butt joint pipe away from the pipeline section is obliquely arranged, the inclined surface of butt joint pipe can be matched with the inclined surface of wedge pipe, a plurality of clamping grooves are arranged on the obliquely arranged side of butt joint pipe, clamping pin is detachably connected with clamping groove, a plurality of through grooves are circumferentially arranged on butt joint pipe, when wedge pipe is opposite to butt joint pipe, a plurality of through grooves and a plurality of clamping grooves are one-to-one butt joint.

[0009] The rotating fixing assembly comprises an eccentric cylinder, a pressing sleeve and a connecting ring, the eccentric cylinder is sleeved on the pipeline section and rotates and slides, the pressing sleeve is fixedly connected to the eccentric cylinder and is close to the butt joint pipe, the pressing sleeve can be sleeved on the butt joint pipe and the wedge-shaped pipe, a plurality of clamping teeth are fixedly connected in the pressing sleeve, the through slot is slidably connected with the clamping teeth, the clamping slot is detachably connected with the clamping teeth, the connecting ring is arranged between the eccentric cylinder and the pressing sleeve, the two connecting rings are connected with each other through a plurality of screw rods, so that the two eccentric cylinders are respectively in contact with the two butt joint pipes, and the positioning strips are fixedly arranged on the eccentric cylinder and are close to and away from the clamping slot.

[0010] The eccentric sleeve is fixedly sleeved on the pipeline section and is close to the butt joint pipe, the eccentric cylinder is slidably and rotatably connected on the eccentric sleeve, and the pressing sleeve rotates with the butt joint pipe.

[0011] When the wedge-shaped pipe is opposite to the butt joint pipe and is away from the pressure guide pipe, the pressing sleeve is aligned with the axis of the wedge-shaped pipe, when the rotating strip rotates to the side of the pipeline section close to the pressure guide pipe, the pressing sleeve and the clamping teeth press the wedge-shaped pipe away from the pressure guide pipe.

[0012] The beneficial effects of the present application are:

[0013] In the present application, the flow cutting piece is arranged in the cylindrical structure, and the throttle plate has the effect of a pipeline type differential pressure flowmeter. When installing, the flow cutting piece is aligned with the pipeline, so that the throttle plate is axially aligned with the pipeline. No adjustment of the throttle plate is required. The pressing butt joint assembly is arranged to quickly butt joint the flow cutting piece and the pressing butt joint assembly. The flow cutting piece is approximately aligned with the pipeline through butt joint. Then, the rotating fixing assembly drives the flow cutting piece and the pressing butt joint assembly to rotate, the flow cutting piece is pressed, the throttle plate is aligned with the pipeline section, and the throttle plate is sealed. Compared with the traditional replacement mode of the throttle plate, the present application is more efficient, and the axial alignment with the pipeline section is achieved through butt joint. The axial alignment of the throttle plate and the pipeline section is more accurate during pressing and fixing, and the replacement and alignment of the throttle plate are more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present application. Those skilled in the art can obtain other drawings according to the contents of the example embodiments of the present application and the drawings without creating any creative labor.

[0015] Figure 1 Fig. 1 is a schematic diagram of the overall structure of a porous balance type differential pressure flowmeter according to an embodiment of the present application;

[0016] Figure 2 Fig. 2 is a schematic diagram of the overall structure of another embodiment of the present application;

[0017] Figure 3 Fig. 3 is a schematic diagram of the sectional structure of the adapter pipe and wedge pipe according to an embodiment of the present application;

[0018] Figure 4 Fig. 4 is a schematic diagram of the sectional structure of the wedge pipe and adapter pipe according to an embodiment of the present application;

[0019] Figure 5 Fig. 5 is a schematic diagram of the sectional structure of the wedge pipe and adapter pipe according to an embodiment of the present application;

[0020] Figure 6 Fig. 6 is a schematic diagram of the sectional structure of the wedge pipe and compression sleeve according to an embodiment of the present application;

[0021] Figure 7 Fig. 7 is a schematic diagram of the structure of the eccentric cylinder and eccentric sleeve when the shifting bar is directed away from the drainage pipe according to an embodiment of the present application.

[0022] In the drawings: 1, pipe; 2, pressure lead pipe; 3, valve group; 4, pipe section; 5, instrument; 6, throttle plate; 7, wedge pipe; 8, clamping groove; 9, clamping pin; 10, shifting bar; 11, adapter pipe; 12, clamping groove; 13, through groove; 14, eccentric cylinder; 15, compression sleeve; 16, clamping tooth; 17, connecting ring; 18, eccentric sleeve; 19, positioning bar. DETAILED DESCRIPTION

[0023] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of explanation and are not intended to limit the present application.

[0024] In order to make the drawings simple, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts having the same structure or function is shown schematically, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0025] In this document, unless otherwise indicated and limited, the terms "mount", "connect", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] In the present application, unless otherwise specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0027] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] As Figures 1-7As shown in the figure, it shows a porous balanced differential pressure flowmeter in an embodiment of the application, which comprises a pipeline 1, a pressure lead pipe 2, a valve group 3, a pipeline section 4 and an instrument 5, the pipeline section 4 is connected with the pipeline 1, the valve group 3 is connected with the pipeline section 4 through the pressure lead pipe 2, the instrument 5 is installed on the valve group 3, the pipeline section 4 is divided into two sections, two pressure lead pipes 2 are respectively connected with the two pipeline sections 4, and the porous balanced differential pressure flowmeter further comprises a compression butt joint assembly, a flow cutting piece, a throttle plate 6 and a rotary fixing assembly, two compression butt joint assemblies are respectively rotationally connected on one end of the two pipeline sections 4 close to each other, the two compression butt joint assemblies are oppositely arranged, the flow cutting piece is arranged between the two compression butt joint assemblies, the two sides of the flow cutting piece are respectively detachably connected with the two compression butt joint assemblies, the compression butt joint assembly is used for butt joint communication with the flow cutting piece, the flow cutting piece is arranged in a ring shape, the throttle plate 6 is fixedly installed in the flow cutting piece, a plurality of through holes are uniformly formed in the throttle plate 6, when the two ends of the flow cutting piece are connected with the two compression butt joint assemblies respectively, the fluid in the pipeline 1 can flow in the pipeline section 4, the compression butt joint assembly and the flow cutting piece, two rotary fixing assemblies are respectively rotationally and slidingly connected on the two pipeline sections 4, the rotary fixing assembly can be detachably connected with the compression butt joint assembly and the flow cutting piece, the two rotary fixing assemblies are detachably connected, and the rotary fixing assembly is used for compressing the flow cutting piece and the compression butt joint assembly, the throttle plate 6 is arranged on the wedge-shaped pipe 7 in the application, when the wedge-shaped pipe 7 is aligned with the pipeline section 4, the throttle plate 6 is naturally aligned with the pipeline section 4, which is similar to the installation mode of the pipeline differential pressure flowmeter, and the adjustment process of aligning the throttle plate 6 with the axis of the pipeline section 4 is avoided, and at the same time, after the flow cutting piece is connected with the compression butt joint assembly, the flow cutting piece is communicated with the pipeline section 4, then the flow cutting piece, the compression butt joint assembly and the rotary fixing assembly are simultaneously rotated by 180 degrees, the rotary fixing assembly compresses the flow cutting piece, so that the flow cutting piece and the compression butt joint assembly are tightly sealed, the replacement and alignment of the throttle plate 6 are completed, compared with the existing various differential pressure flowmeters, the throttle plate 6 is arranged on the wedge-shaped pipe 7 in the application, so that the throttle plate 6 does not need to be aligned, and the wedge-shaped pipe 7 and the pipeline section 4 are aligned by compressing and aligning the flow cutting piece, and the sealing between the pipelines is also completed under the compression.

[0030] As Figures 1-3 shown, when the flow cutting piece is connected with the compression butt joint assembly, the rotary fixing assembly compresses the flow cutting piece and the compression butt joint assembly, so that the throttle plate 6 is aligned with the pipeline section 4.

[0031] As Figures 3-6As shown, the flow blocking member includes a wedge-shaped tube 7, a clamping slot 8, a clamping pin 9 and a rotating bar 10, the throttle plate 6 is fixedly installed in the wedge-shaped tube 7, the two sides of the wedge-shaped tube 7 are inclinedly arranged, the inclined surfaces of the wedge-shaped tube 7 are detachably connected with the compression docking assembly, a plurality of clamping slots 8 are circumferentially arranged on the wedge-shaped tube 7, a plurality of clamping slots 8 are arranged on the two sides of the wedge-shaped tube 7, a plurality of clamping pins 9 are fixedly connected to the inclined positions on the two sides of the wedge-shaped tube 7, the clamping pins 9 are matched with the compression docking assembly, the rotating bar 10 is fixedly connected to the wedge-shaped tube 7, the wedge-shaped tube 7 can be docked with the compression docking assembly on the side of the pipeline section 4 away from the pressure lead pipe 2, the side view of the wedge-shaped tube 7 is trapezoidal, the inclined arrangement of the two sides makes the wedge-shaped tube 7 be compressed between the two docking pipes 11, so that the fit between the wedge-shaped tube 7 and the docking pipe 11 is more compact, the clamping pin 9 slides into the clamping slot 12, the wedge-shaped tube 7 can be rotated by the rotating bar 10, and the clamping slot 12 can be driven to rotate by the clamping pin 9.

[0032] As shown in the drawings, Figures 3-7 As shown, the compression docking assembly includes a docking pipe 11, a clamping slot 12 and a through slot 13, the docking pipe 11 is rotatably connected to the pipeline section 4, the side of the docking pipe 11 away from the pipeline section 4 is inclinedly arranged, the inclined surface of the docking pipe 11 can be fitted and docked with the inclined surface of the wedge-shaped tube 7, a plurality of clamping slots 12 are arranged on the side of the docking pipe 11 which is inclinedly arranged, the clamping pin 9 is detachably connected with the clamping slot 12, a plurality of through slots 13 are circumferentially arranged on the docking pipe 11, when the wedge-shaped tube 7 is docked with the docking pipe 11, the plurality of through slots 13 are one-to-one docked with the plurality of clamping slots 8, when the wedge-shaped tube 7 is docked with the docking pipe 11, the inclined direction of the inclined surface of the docking pipe 11 is towards the direction away from the pressure lead pipe 2, when the wedge-shaped tube 7 is inserted between the two docking pipes 11, the inclined surfaces of the two docking pipes 11 contact with the wedge-shaped tube 7, the clamping slot 8 contacts with the through slot 13, the docking pipe 11 is rotated by the wedge-shaped tube 7, by the mutual fitting of the two inclined surfaces, the connection between the wedge-shaped tube 7 and the docking pipe 11 is also more compact when the wedge-shaped tube 7 is extruded, so as to realize the sealing of the wedge-shaped tube 7 and the docking pipe 11, the flange gasket can be arranged on the inclined surfaces of the wedge-shaped tube 7 and the docking pipe 11, for sealing, the sealing mode is similar to the flange-to-clamp type differential pressure flowmeter.

[0033] As shown in the drawings, Figures 4-7As shown, the rotating fixing assembly comprises an eccentric cylinder 14, a pressing sleeve 15 and a connecting ring 17, the eccentric cylinder 14 is rotatably and slidably sleeved on the pipeline section 4, the pressing sleeve 15 is fixedly connected on one side of the eccentric cylinder 14 close to the butt joint pipe 11, the pressing sleeve 15 can be sleeved on the butt joint pipe 11 and the wedge-shaped pipe 7, a plurality of clamping teeth 16 are fixedly connected in the pressing sleeve 15, the through slot 13 is slidably connected with the clamping teeth 16, the clamping groove 8 is detachably connected with the clamping teeth 16, the connecting ring 17 is arranged between the eccentric cylinder 14 and the pressing sleeve 15, the two connecting rings 17 can be connected with each other through a plurality of screw rods, so that the two eccentric cylinders 14 are respectively in contact with the two butt joint pipes 11, the positioning strips 19 are fixedly arranged on the eccentric cylinder 14 close to and away from the clamping groove 12, the clamping teeth 16 slide in the through slot 13, after the wedge-shaped pipe 7 is butt jointed with the butt joint pipe 11, the eccentric cylinder 14 can slide on the eccentric sleeve 18 so that the clamping teeth 16 are in butt joint with the clamping groove 8, at this time, the eccentric cylinder 14 can extrude the butt joint pipe 11 towards the wedge-shaped pipe 7, but the clamping teeth 16 cannot push the wedge-shaped pipe 7 in the axial direction through the clamping groove 8, when the two connecting rings 17 are connected through the screw rods and the like, the two connecting rings 17 are pulled close to each other through the nuts and the screw rods, at this time, the eccentric cylinder 14 slides on the eccentric sleeve 18 and simultaneously pushes the butt joint pipe 11, so that the two butt joint pipes 11 clamp the wedge-shaped pipe 7 in the axial direction on both sides, since the clamping teeth 16 push the wedge-shaped pipe 7 in the axial direction, only the wedge-shaped pipe 7 can be extruded, the sealing effect between the wedge-shaped pipe 7 and the butt joint pipe 11 cannot be enhanced, the butt joint pipe 11 and the eccentric cylinder 14 can be simultaneously rotated through the clamping teeth 16, so that the butt joint pipe 11 and the wedge-shaped pipe 7 can be extruded in the perpendicular and axial directions through the clamping teeth 16.

[0034] As Figures 5-7As shown, the eccentric sleeve 18 is fixed on one side of the pipeline segment 4 close to the butt joint pipe 11, the eccentric sleeve 14 is slidingly connected on the eccentric sleeve 18, the compression sleeve 15 rotates with the butt joint pipe 11, the eccentric sleeve 18 and the inner and outer circles of the eccentric sleeve 14 have different centers, the eccentric sleeve 18 and the eccentric sleeve 14 have two opposite position walls with different thicknesses, when the wedge-shaped pipe 7 is opposite to the butt joint pipe 11 on the side away from the pressure guide pipe 2, the compression sleeve 15 is aligned with the axis of the wedge-shaped pipe 7, at this time, the position with thinner wall thickness on the eccentric sleeve 18 corresponds to the position with thicker wall thickness on the eccentric sleeve 14, so that the compression sleeve 15 and the butt joint pipe 11 have the same center, at this time, the sliding eccentric sleeve 14 makes the clamping teeth 16 extend into the clamping groove 8, at this time, the rotatable eccentric sleeve 14 and the wedge-shaped pipe 7 rotate together, with the rotation, the position with thicker and thinner wall thickness on the eccentric sleeve 18 and the eccentric sleeve 14 rotate, when the rotating strip 10 rotates to the side of the pipeline segment 4 close to the pressure guide pipe 2, the center of the compression sleeve 15 is farther away from the pressure guide pipe 2 than the center of the pipeline segment 4, which causes the compression sleeve 15 and the clamping teeth 16 to press the wedge-shaped pipe 7 away from the pressure guide pipe 2, through the 180-degree rotation of the butt joint pipe 11, the wedge-shaped pipe 7 and the eccentric sleeve 14, the butt joint pipe 11 and the wedge-shaped pipe 7 can be pushed away from the pressure guide pipe 2 by the clamping teeth 16, so that the wedge-shaped pipe 7 and the butt joint pipe 11 are more closely connected, and the throttle plate 6 is aligned with the pipeline 1, and at the same time, the eccentric sleeve 14 pushes the butt joint pipe 11 in the axial direction to clamp the wedge-shaped pipe 7, so as to realize the sealing of the wedge-shaped pipe 7.

[0035] Figures 1-7 As shown, the wedge-shaped pipe 7, the butt joint pipe 11 and the eccentric sleeve 14 are in a matching state when the rotating strip 10 is away from the pressure guide pipe 2. Figure 7 As shown, the eccentric sleeve 14 and the eccentric sleeve 18 are in a matching state, at this time, the compression sleeve 15 is coaxial with the butt joint pipe 11.

[0036] In this embodiment, the butt joint pipe 11 is rotated to the side of the clamping groove 12 away from the pressure guide pipe 2, the wedge-shaped pipe 7 is inserted between the two butt joint pipes 11, the wedge-shaped pipe 7 is in close contact with the butt joint pipe 11, the clamping pin 9 is inserted into the clamping groove 12, the eccentric sleeve 14 is slidingly connected on the eccentric sleeve, the clamping teeth 16 are extended into the clamping groove 8, the eccentric sleeve 14, the butt joint pipe 11 and the wedge-shaped pipe 7 are rotated, when the rotating strip 10 rotates to the side close to the pressure guide pipe 2, the clamping teeth 16 press the through groove 13 and the clamping groove 8 away from the pressure guide pipe 2, so that the inclined surface of the wedge-shaped pipe 7 is more closely attached to the butt joint pipe 11, the throttle plate 6 is aligned with the pipeline segment 4, at this time, the two connecting rings 17 are connected and pulled close by means of a screw rod, the eccentric sleeve 14 extrudes the butt joint pipe 11, so as to extrude the wedge-shaped pipe 7 in the axial direction.

[0037] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalently replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A multi-hole balanced differential pressure flowmeter comprising a pipeline (1), a pressure lead pipe (2), a valve group (3), a pipe section (4) and a meter (5), the pipe section (4) being connected with the pipeline (1), the valve group (3) being communicated with the pipe section (4) through the pressure lead pipe (2), the meter (5) being installed on the valve group (3), characterized in that, The pipeline section (4) is divided into two sections, two said pressure pipes (2) are respectively connected with two said pipeline sections (4), further comprising: Two compression butt joint assemblies are respectively rotatably connected on one end of two said pipeline sections (4) close to each other, two said compression butt joint assemblies are oppositely arranged, a flow blocking member is arranged between two said compression butt joint assemblies, two sides of the flow blocking member are respectively detachably connected with two said compression butt joint assemblies, and the compression butt joint assembly is used for butt joint communication with the flow blocking member. The flow blocking member is arranged in a ring shape, a throttle plate (6) is fixedly installed in the flow blocking member, a plurality of through holes are uniformly formed in the throttle plate (6), when two ends of the flow blocking member are connected with two said compression butt joint assemblies respectively, the fluid in the pipeline (1) can flow in the pipeline section (4), the compression butt joint assembly and the flow blocking member. Two rotary fixing assemblies are respectively rotatably and slidably connected on two said pipeline sections (4), the rotary fixing assembly can be detachably connected with the compression butt joint assembly and the flow blocking member, two said rotary fixing assemblies are detachably connected, and the rotary fixing assembly is used for compressing the flow blocking member and the compression butt joint assembly.

2. A differential pressure flow meter of the balanced, multi-orifice type according to claim 1, characterized in that, When the flow blocking member is connected with the compression butt joint assembly, the rotary fixing assembly compresses the flow blocking member and the compression butt joint assembly, so that the throttle plate (6) is aligned with the pipeline section (4).

3. A differential pressure flow meter of the type described in claim 2 wherein, The flow blocking member comprises: A wedge-shaped pipe (7), the throttle plate (6) is fixedly installed in the wedge-shaped pipe (7), two sides of the wedge-shaped pipe (7) are arranged in an inclined manner, and the inclined surface of the wedge-shaped pipe (7) is detachably connected with the compression butt joint assembly; A plurality of clamping grooves (8) are circumferentially formed on the wedge-shaped pipe (7), a plurality of clamping grooves (8) are formed on two sides of the wedge-shaped pipe (7); A plurality of clamping pins (9) are respectively fixedly connected to the inclined positions on two sides of the wedge-shaped pipe (7), and the clamping pins (9) are matched with the compression butt joint assembly; A rotating rod (10) is fixedly connected to the wedge-shaped pipe (7).

4. A differential pressure flow meter of the type described in claim 3 wherein, The wedge-shaped pipe (7) can be butted with the compression butt joint assembly on the side of the pipeline section (4) away from the pressure pipe (2).

5. A differential pressure flow meter of the type described in claim 4 wherein, The compression butt joint assembly comprises: A butt joint pipe (11) is rotatably connected to the pipeline section (4), one side of the butt joint pipe (11) away from the pipeline section (4) is arranged in an inclined manner, and the inclined surface of the butt joint pipe (11) can be matched with the inclined surface of the wedge-shaped pipe (7); A plurality of clamping grooves (12) are formed on the side of the butt joint pipe (11) arranged in an inclined manner, the clamping pins (9) are detachably connected with the clamping grooves (12); A plurality of through grooves (13) are circumferentially formed on the butt joint pipe (11), when the wedge-shaped pipe (7) is butted with the butt joint pipe (11), a plurality of the through grooves (13) are butted with a plurality of the clamping grooves (8) one by one.

6. A differential pressure flow meter of the type described in claim 5 wherein, The rotary fixing assembly comprises: An eccentric cylinder (14) is rotatably and slidably sleeved on the pipeline section (4), and can be in contact with the butt joint pipe (11); A pressing sleeve (15) is fixedly connected to one side of the eccentric cylinder (14) close to the butt joint pipe (11), and can be sleeved on the butt joint pipe (11) and the wedge-shaped pipe (7). A plurality of clamping teeth (16) are fixedly connected inside the pressing sleeve (15), the through slot (13) is slidably connected with the clamping teeth (16), and the clamping slot (8) is detachably connected with the clamping teeth (16). A connecting ring (17) is arranged between the eccentric cylinder (14) and the pressing sleeve (15).

7. A differential pressure flow meter of the type described in claim 6 wherein, An eccentric sleeve (18) is fixedly sleeved on one side of the pipeline section (4) close to the butt joint pipe (11), and the eccentric cylinder (14) is slidably and rotatably connected on the eccentric sleeve (18).

8. A differential pressure flow meter of the type described in claim 7 wherein, The pressing sleeve (15) rotates simultaneously with the butt joint pipe (11).

9. A differential pressure flow meter of the type described in claim 8 wherein, When the wedge-shaped pipe (7) is opposite to the butt joint pipe (11) on the side away from the pressure lead pipe (2), the pressing sleeve (15) is aligned with the axis of the wedge-shaped pipe (7), and when the rotating strip (10) is rotated to the side of the pipeline section (4) close to the pressure lead pipe (2), the pressing sleeve (15) and the clamping teeth (16) press the wedge-shaped pipe (7) away from the pressure lead pipe (2).

10. A differential pressure flow meter of the type described in claim 6 wherein, The eccentric cylinder (14) is fixedly provided with a positioning strip (19) on the side close to and away from the clamping slot (12).

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