Orifice plate flowmeter convenient to replace

Abstract

The utility model provides an orifice plate flowmeter convenient to replace. The orifice plate flowmeter convenient to replace comprises a first pipe body, a second pipe body, an orifice plate, a third pipe body, a first hydraulic cylinder, two second hydraulic cylinders, a driving assembly and a plurality of elastic pieces. The third pipe body is matched on the first pipe body in a sealed and telescopic mode in the axial direction of the first pipe body, a second rodless cavity of the second hydraulic cylinder is communicated with a first rodless cavity of the first hydraulic cylinder, oil is contained in the second rodless cavity and the first rodless cavity, and the second piston rod is fixedly connected with the third pipe body. The driving assembly is used for driving the first piston rod to stretch out or retract, and the multiple elastic pieces are used for applying elastic force to the third pipe body so that the third pipe body can tend to move towards the first pipe body. Through mutual cooperation of the driving assembly, the first hydraulic cylinder, the second hydraulic cylinder and the elastic piece, the pore plate can be rapidly taken out and installed, the time for replacing the pore plate is greatly shortened, the influence on industrial production continuity is reduced, and the labor cost is also reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to flow measurement equipment technical field, concretely relates to a convenient replacement formula orifice plate flowmeter. BACKGROUND

[0002] Orifice plate flowmeter as a commonly used flow measuring instrument, is widely used in petroleum, chemical industry, metallurgy, electric power and multiple industrial fields. In actual use process, orifice plate as the core component directly with fluid contact, will cause the change of orifice diameter, surface wear or blockage etc. due to the scouring, corrosion and impurity adhesion etc. of fluid, and then influence the accuracy of flow measurement. Therefore, need to regularly check, clean or replace orifice plate.

[0003] The traditional orifice plate flowmeter usually needs to first detach the whole flowmeter from the pipeline system when replacing orifice plate, then carries out the replacement operation of orifice plate. The process not only needs to consume a lot of time and manpower, but also will cause the whole pipeline system to stop running, seriously influence the continuity of industrial production. UTILITARIAN CONTENT

[0004] In view of the defects in the prior art, the utility model aims at providing a convenient replacement formula orifice plate flowmeter to solve or at least alleviate one or more of the above technical problems or other aspects in the prior art.

[0005] In order to realize the above-mentioned purpose, the utility model provides a convenient replacement formula orifice plate flowmeter, including first pipe body, with first end face and first sampling nozzle;Second pipe body, with the first pipe body is connected, the second pipe body has second end face and second sampling nozzle, the second end face is close to the first end face, and the installation gap is formed between the first end face;Orifice plate, detachably arranged on the second end face, the orifice plate has first wall surface and second wall surface, the first wall surface is towards the first end face, and the second wall surface can be sealed and clings to the second end face;Third pipe body, arranged in the installation gap, the third pipe body is sealed and telescopic cooperation on the first pipe body along the axial direction of the first pipe body, the third pipe body has third end face, and the third end face can seal and press the first wall surface;

[0006] A first hydraulic cylinder is arranged on the first pipe body, and the first hydraulic cylinder is provided with a first rodless cavity, a first rod cavity, a first exhaust valve and a first piston rod, the first exhaust valve being used for exhausting air in the first rod cavity; two second hydraulic cylinders are arranged on the first pipe body respectively, and the second hydraulic cylinders are provided with a second rodless cavity, a second rod cavity, a second exhaust valve and a second piston rod, the second rodless cavity being communicated with the first rodless cavity, and the second rodless cavity and the first rodless cavity are both filled with oil, the second exhaust valve being used for exhausting air in the second rod cavity, and the second piston rod being connected with the third pipe body; a driving assembly is used for driving the first piston rod to extend or retract; and a plurality of elastic members are used for applying elastic force to the third pipe body, so that the third pipe body has a tendency to move towards the first pipe body.

[0007] Preferably, the driving assembly comprises a bracket, a nut and a screw rod, the bracket is arranged on a cylinder barrel of the first hydraulic cylinder, the nut is arranged on the bracket, the screw rod is threadedly matched with the nut, the screw rod is coaxially arranged with the first piston rod, the screw rod is rotationally connected with the first piston rod, and the screw rod is configured to be unable to move along an axial direction of the first piston rod.

[0008] Preferably, an end of the screw rod away from the first piston rod is provided with a hand wheel.

[0009] Preferably, an outer wall of the third pipe body is provided with two ears, and each second piston rod is connected with a corresponding ear.

[0010] Preferably, each ear corresponds to an elastic member, and two ends of the elastic member are respectively connected with the second pipe body and the corresponding ear.

[0011] Preferably, a plurality of first installation grooves are recessed on the second end face, a first limiting protrusion is arranged in each first installation groove, and a second limiting protrusion is arranged on a side of each ear facing the second end face; the elastic members are arranged in the first installation grooves and respectively sleeved outside the first limiting protrusions and the second limiting protrusions.

[0012] Preferably, a second installation groove is recessed on the second end face, the second installation groove penetrates through an outer wall of the second pipe body along a radial direction of the second pipe body and forms an installation gap, and the hole plate is matched with the second installation groove through the installation gap; the second installation groove has a third wall surface parallel to the second end face, a distance between the second end face and the third wall surface is greater than a thickness of the hole plate, and the third pipe body can push the hole plate to move, so that the second wall surface is sealed and abuts against the third wall surface.

[0013] Preferably, a plurality of connecting columns are further included, the plurality of connecting columns are distributed along the circumference of the first pipe body, and the connecting columns are respectively connected to the first end face and the second end face.

[0014] Preferably, the third pipe body has a fourth end face close to the first end face, an annular protrusion is arranged on the fourth end face, the annular protrusion is arranged outside the pipe opening of the third pipe body, the first end face is recessed to form an annular groove, the annular groove is arranged outside the pipe opening of the first pipe body, and the annular protrusion is sealingly fitted in the annular groove.

[0015] Preferably, an extension ring body is arranged in the third pipe body, an outer wall of the extension ring body is sealingly fixed to an inner wall of the third pipe body, the extension ring body extends into the pipe opening of the first pipe body, and the outer wall of the extension ring body is sealingly fitted to the inner wall of the first pipe body.

[0016] The utility model discloses a beneficial effect:

[0017] The utility model discloses a convenient replacement formula orifice plate flowmeter, through the mutual cooperation of drive assembly, first hydraulic cylinder, second hydraulic cylinder and elastic part, can realize the quick taking out and installation of orifice plate, greatly shorten the time of orifice plate replacement, reduce the influence to industrial production continuity, also reduce manpower cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0019] Figure 1 The structure schematic view of the convenient replacement formula orifice plate flowmeter provided by the embodiment of the utility model is shown in the figure.

[0020] Figure 2 The sectional view schematic diagram of the flowmeter is shown in the figure.

[0021] Figure 3 The structure schematic diagram of the first pipe body is shown in the figure.

[0022] Figure 4 The sectional view schematic diagram of the third pipe body is shown in the figure. Figure 3 The local schematic diagram of B in the figure.

[0023] Figure 5 The structure schematic diagram of the third pipe body is shown in the figure.

[0024] Figure 6 The sectional view schematic diagram of the third pipe body is shown in the figure.

[0025] Figure 7 Structure diagram of the first pipe body and the third pipe body;

[0026] Figure 8 Structure diagram of the second pipe body;

[0027] Figure 9 Sectional view diagram of the second pipe body and the orifice plate;

[0028] Figure 10 Structure diagram of the first pipe body and the second pipe body;

[0029] Figure 11 Another sectional view diagram of the flowmeter;

[0030] Figure 12 Structure diagram of the first pipe body and the third pipe body; Figure 2 Partial view diagram of A in the middle;

[0031] Reference signs:

[0032] 10, first pipe body; 11, first end face; 12, first sampling nozzle; 13, annular groove; 20, second pipe body; 21, second end face; 22, second sampling nozzle; 23, first mounting groove; 24, first limiting protrusion; 25, second mounting groove; 251, third wall face; 30, orifice plate; 31, first wall face; 40, third pipe body; 41, third end face; 42, supporting lug; 421, second limiting protrusion; 43, fourth end face; 44, annular protrusion; 45, extension ring body; 50, first hydraulic cylinder; 51, first rodless cavity; 52, first rod cavity; 53, first exhaust valve; 54, first piston rod; 60, second hydraulic cylinder; 61, second rodless cavity; 62, second rod cavity; 63, second exhaust valve; 64, second piston rod; 70, driving assembly; 71, bracket; 72, nut; 73, screw rod; 74, hand wheel; 80, elastic member; 90, sealing ring; 100, connecting column; 110, hydraulic pipe. DETAILED DESCRIPTION

[0033] The embodiments of the technical scheme of the utility model will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model.

[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be understood as the usual meanings understood by the technical personnel in the field to which the utility model belongs.

[0035] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0037] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between 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.

[0038] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0039] As Figures 1-12As shown, in an embodiment of the utility model, provide a convenient replacement formula orifice plate flowmeter, including first pipe body 10, second pipe body 20, orifice plate 30, third pipe body 40, first hydraulic cylinder 50, two second hydraulic cylinders 60, drive assembly 70 and multiple elastic members 80. First pipe body 10 has first end face 11 and first sampling mouth 12, second pipe body 20 is fixedly connected with first pipe body 10, second pipe body 20 has second end face 21 and second sampling mouth 22, second end face 21 is close to first end face 11, and installation gap is formed between first end face 11. Orifice plate 30 is detachably arranged on second end face 21, and orifice plate 30 has first wall surface 31 and second wall surface, first wall surface 31 is towards first end face 11, and second wall surface can be sealed and clings on second end face 21. Third pipe body 40 is arranged in installation gap, and third pipe body 40 is sealed and telescopicly fitted on first pipe body 10 along the axial direction of first pipe body 10, and third pipe body 40 has third end face 41, and third end face 41 is towards first wall surface 31, and third end face 41 can seal and press first wall surface 31. In practical application, sealing ring 90 is arranged on third end face 41 and second end face 21 to enhance the sealing performance between third end face 41 and orifice plate 30 and between orifice plate 30 and second end face 21.

[0040] First hydraulic cylinder 50 is fixedly installed on first pipe body 10, and first hydraulic cylinder 50 is provided with first rodless cavity 51, first rod cavity 52, first exhaust valve 53 and first piston rod 54, and first exhaust valve 53 is used to discharge the air in first rod cavity 52. Two second hydraulic cylinders 60 are symmetrically arranged on first pipe body 10, and second hydraulic cylinder 60 is provided with second rodless cavity 61, second rod cavity 62, second exhaust valve 63 and second piston rod 64, second rodless cavity 61 is communicated with first rodless cavity 51 through hydraulic pipe 110, oil is contained in second rodless cavity 61, first rodless cavity 51 and hydraulic pipe 110, second exhaust valve 63 is used to discharge the air in second rod cavity 62, and second piston rod 64 is fixedly connected with third pipe body 40. First exhaust valve 53 and second exhaust valve 63 are prior art, and will not be described again in the embodiment.

[0041] Drive assembly 70 is used to drive first piston rod 54 to extend or retract, and multiple elastic members 80 are distributed along the circumference of third pipe body 40, and elastic member 80 is used to exert elastic force on third pipe body 40, so that third pipe body 40 has the tendency of moving towards first pipe body 10. Of course, the installation position of multiple elastic members 80 will not interfere with the normal disassembly of orifice plate 30.

[0042] When the orifice plate 30 needs to be replaced, the operator operates the drive assembly 70 to drive the first piston rod 54 to move towards the first rod cavity 52 side, the pressure in the first rodless cavity 51 is reduced. Since the second rodless cavity 61 is in communication with the first rodless cavity 51 and remains sealed, at this time, the elastic force of the plurality of elastic members 80 on the third tube body 40 is greater than the thrust of the oil on the second piston rod 64, the elastic members 80 push the third tube body 40 to move towards the first tube body 10 side, so that the third end face 41 is separated from the orifice plate 30, at this time, the orifice plate 30 can be taken out for replacement. In this process, the third tube body 40 will drive the second piston rod 64 to retract (move towards the second rodless cavity 61 side), the second piston rod 64 will push the oil in the second rodless cavity 61 into the first rodless cavity 51 through the hydraulic pipe 110, and the oil in the first rodless cavity 51, the second rodless cavity 61 and the hydraulic pipe 110 is always in a state of being under pressure.

[0043] When the orifice plate 30 is installed, the operator operates the drive assembly 70 to drive the first piston rod 54 to move towards the first rodless cavity 51 side, the first piston rod 54 exerts pressure on the oil in the first rodless cavity 51, so that the pressure of the oil is increased, and the oil enters the two second rodless cavities 61 to push the second piston rod 64 to extend. When the second piston rod 64 extends, it drives the third tube body 40 connected thereto to move along the axial direction of the first tube body 10 towards the second tube body 20 until the third end face 41 is sealed against the first wall surface 31 of the orifice plate 30 and exerts pressure on the orifice plate 30, so that the second wall surface of the orifice plate 30 is sealed against the second end face 21 of the second tube body 20, that is, the installation of the orifice plate 30 is completed, at this time, the flowmeter can normally measure the flow.

[0044] The convenient replacement type orifice plate flowmeter disclosed in the embodiment can realize the quick removal and installation of the orifice plate 30 through the cooperation of the drive assembly 70, the first hydraulic cylinder 50, the second hydraulic cylinder 60 and the elastic members 80, which greatly shortens the replacement time of the orifice plate 30, reduces the influence on the continuity of industrial production, and also reduces the labor cost.

[0045] Referring to Figure 3 and Figure 4In one embodiment, the driving assembly 70 comprises a bracket 71, a nut 72 and a screw rod 73. The bracket 71 is fixedly installed on the cylinder barrel of the first hydraulic cylinder 50. The nut 72 is fixedly installed on the bracket 71. The screw rod 73 is threadedly matched with the nut 72. The screw rod 73 is coaxially arranged with the first piston rod 54. The screw rod 73 is rotationally connected with the first piston rod 54 and is configured to be unable to move along the axial direction of the first piston rod 54. For example, the end of the screw rod 73 and the end of the first piston rod 54 can be rotationally connected through a bearing, so that the screw rod 73 can freely rotate relative to the first piston rod 54, while the screw rod 73 can drive the first piston rod 54 to move along the axial direction. The screw rod 73 and the nut 72 are threadedly matched in the driving mode. The threaded transmission has the advantages of high transmission accuracy, self-locking performance and labor saving. The operator only needs to rotate the screw rod 73 to drive the first piston rod 54 to act, without the need to exert a large force, thereby reducing the operation difficulty and labor intensity and further improving the convenience of replacing the hole plate 30.

[0046] Further, the end of the screw rod 73 away from the first piston rod 54 is fixedly installed with a hand wheel 74. The hand wheel 74 provides a convenient force exertion position for the operator. The operator only needs to rotate the hand wheel 74 to complete the rotation operation of the screw rod 73 without the need to use other tools, thereby greatly simplifying the operation process and improving the efficiency of replacing the hole plate 30.

[0047] Referring to Figure 5 and Figure 6 In one embodiment, the outer wall of the third pipe body 40 is installed with two lugs 42. Each second piston rod 64 is fixedly connected with a corresponding lug 42. The lug 42 provides a reliable support structure for the connection between the second piston rod 64 and the third pipe body 40. Through a reasonable connection mode (such as bolt connection), it can be ensured that the connection between the second piston rod 64 and the third pipe body 40 is firm and will not be loose or fall off during the transmission of the driving force, thereby ensuring the effective transmission of the driving force. The two lugs 42 are symmetrically arranged on the outer wall of the third pipe body 40, so as to ensure that the third pipe body 40 is uniformly stressed when subjected to the driving force of the two second piston rods 64, thereby ensuring that the third pipe body 40 can smoothly move along the axial direction and accurately realize the compression and release of the hole plate 30.

[0048] Further, each lug 42 corresponds to an elastic member 80. The two ends of the elastic member 80 are respectively connected with the second pipe body 20 and the corresponding lug 42. The elastic member 80 is selected to be a compression spring. The compression spring has good elastic performance and reset ability, can store elastic potential energy when compressed, and release the elastic potential energy when the pressure is released, thereby pushing the lug 42 and the third pipe body 40 to move.

[0049] The axis of the elastic member 80 is parallel to the axial direction of the third tube body 40, so as to ensure that the elastic force of the elastic member 80 on the lug 42 is along the axial direction of the third tube body 40, and the lug 42 and the third tube body 40 can be effectively pushed to move towards the first tube body 10. The length and stiffness of the elastic member 80 can be designed according to actual needs, so as to ensure that the elastic member 80 can provide sufficient elastic force in the compressed state.

[0050] Further, the second end surface 21 is recessed with two first installation grooves 23, and the first installation groove 23 is provided with a first limiting protrusion 24. The side of the lug 42 facing the second end surface 21 is provided with a second limiting protrusion 421. The elastic member 80 is arranged in the first installation groove 23 and is sleeved outside the first limiting protrusion 24 and the second limiting protrusion 421 respectively. The first installation groove 23 provides an accurate installation position for the elastic member 80, and the first limiting protrusion 24 in the first installation groove 23 and the second limiting protrusion 421 on the lug 42 can effectively limit the elastic member 80, prevent the elastic member 80 from being laterally deviated or axially moved during work, and make the elastic member 80 always in the correct working position, so as to avoid affecting the reset effect of the third tube body 40 and ensure that the orifice plate 30 can be smoothly separated from the third tube body 40 when being disassembled.

[0051] Of course, in addition to the two symmetrical lugs 42 described above, another lug 42 can be designed on the outer wall of the third tube body 40, and correspondingly, another first installation groove 23 and another elastic member 80 can be designed on the second end surface 21, so as to improve the reset effect of the third tube body 40.

[0052] In an embodiment, the second end surface 21 is recessed to form a second installation groove 25, the second installation groove 25 penetrates the outer wall of the second tube body 20 along the radial direction of the second tube body 20 and forms an installation gap, and the orifice plate 30 is matched with the second installation groove 25 through the installation gap. The second installation groove 25 has a third wall surface 251 parallel to the second end surface 21, and the distance between the second end surface 21 and the third wall surface 251 is greater than the thickness of the orifice plate 30. The third tube body 40 can push the orifice plate 30 to move, so that the second wall surface is sealed and abuts against the third wall surface 251.

[0053] The second installation groove 25 and the installation gap provide a convenient channel for the installation and disassembly of the orifice plate 30. The operator can directly put the orifice plate 30 into the second installation groove 25 or take it out from the second installation groove 25 through the installation gap, without the need to disassemble the flowmeter complicatedly, further simplifying the installation and disassembly process of the orifice plate 30 and improving the operation efficiency.

[0054] The distance between the second end surface 21 and the third wall surface 251 is greater than the thickness of the orifice plate 30, so that the orifice plate 30 has a certain moving space in the second mounting groove 25. This design fundamentally avoids scratching, extruding or misplacement damage to the sealing ring 90 on the third wall surface 251 during installation of the orifice plate 30, ensures that the sealing ring 90 always maintains a perfect sealing shape and performance, effectively prolongs the service life of the sealing ring 90, reduces the risk of sealing failure caused by damage to the sealing ring 90, and reduces the maintenance cost in the later period.

[0055] In one embodiment, the flowmeter further comprises a plurality of connecting columns 100 distributed along the circumference of the first pipe body 10, and the two ends of the connecting column 100 are fixedly connected with the first end surface 11 and the second end surface 21, respectively. The connecting column 100 can firmly connect the first pipe body 10 and the second pipe body 20 together, enhance the structural stability and rigidity of the connection between the two, prevent relative displacement or separation between the first pipe body 10 and the second pipe body 20, and guarantee the integrity and stability of the overall structure of the flowmeter. At the same time, the stable connection structure can also provide a stable working environment for other components such as the third pipe body 40, the first hydraulic cylinder 50 and the second hydraulic cylinder 60, and ensure the reliability of the entire flowmeter.

[0056] In one embodiment, the third pipe body 40 has a fourth end surface 43 close to the first end surface 11, and the fourth end surface 43 is provided with an annular protrusion 44 surrounding the pipe opening of the third pipe body 40. The first end surface 11 is recessed to form an annular groove 13 surrounding the pipe opening of the first pipe body 10, and the annular protrusion 44 is sealingly fitted in the annular groove 13. The annular protrusion 44 and the annular groove 13 form an annular sealing structure, which can effectively prevent fluid leakage from the gap between the third pipe body 40 and the first end surface 11.

[0057] At the same time, the cooperation of the annular protrusion 44 and the annular groove 13 not only plays a sealing role, but also plays a guiding and positioning role for the movement of the third pipe body 40. During the axial extension and retraction movement of the third pipe body 40 along the first pipe body 10, the annular protrusion 44 always moves in the annular groove 13, which can limit the radial displacement of the third pipe body 40, ensure that the third pipe body 40 always moves smoothly in the axial direction, avoid the third pipe body 40 from being skewed or deviated, and guarantee the accurate alignment and reliable sealing between the third pipe body 40 and the orifice plate 30.

[0058] In one embodiment, the third pipe body 40 is provided with an extension ring body 45, the outer wall of the extension ring body 45 is sealingly fixed with the inner wall of the third pipe body 40, the extension ring body 45 extends into the pipe opening of the first pipe body 10, and the outer wall of the extension ring body 45 is sealingly matched with the inner wall of the first pipe body 10. The structure design makes the third pipe body 40 and the first pipe body 10 form multiple seals, further enhances the sealing performance between the two, can effectively prevent fluid from leaking from the gap between the third pipe body 40 and the first pipe body 10, and ensures good sealing effect.

[0059] In the description of the utility model, a large number of specific details are explained. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0060] Finally, it should be noted that: the above embodiments are only used to illustrate the technical scheme of the utility model, and not to limit it; although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical scheme recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model, and they should be covered in the scope of the claims and the description of the utility model.

Claims

1. A convenient replaceable orifice plate flow meter, characterized in that, include: The first tube body (10) has a first end face (11) and a first sampling nozzle (12). The second tube (20) is connected to the first tube (10). The second tube (20) has a second end face (21) and a second sampling nozzle (22). The second end face (21) is close to the first end face (11) and has an installation gap with the first end face (11). A perforated plate (30) is detachably disposed on the second end face (21). The perforated plate (30) has a first wall surface (31) and a second wall surface. The first wall surface (31) faces the first end face (11), and the second wall surface can be sealed against the second end face (21). The third tube (40) is located within the installation gap. The third tube (40) is sealed and telescopically fitted on the first tube (10) along the axial direction of the first tube (10). The third tube (40) has a third end face (41), which can seal and press against the first wall surface (31). The first hydraulic cylinder (50) is provided on the first tube body (10). The first hydraulic cylinder (50) is provided with a first rodless chamber (51), a first rod chamber (52), a first exhaust valve (53) and a first piston rod (54). The first exhaust valve (53) is used to discharge the air in the first rod chamber (52). Two second hydraulic cylinders (60) are respectively installed on the first pipe body (10). The second hydraulic cylinder (60) is provided with a second rodless chamber (61), a second rod chamber (62), a second exhaust valve (63), and a second piston rod (64). The second rodless chamber (61) is connected to the first rodless chamber (51). Both the second rodless chamber (61) and the first rodless chamber (51) are filled with oil. The second exhaust valve (63) is used to discharge the air in the second rod chamber (62). The second piston rod (64) is connected to the third pipe body (40). Drive assembly (70) for driving the first piston rod (54) to extend or retract; and Multiple elastic elements (80) are used to apply elastic force to the third tube (40) so that the third tube (40) tends to move toward the first tube (10).

2. The convenient replaceable orifice plate flow meter according to claim 1, characterized in that, The drive assembly (70) includes a bracket (71), a nut (72), and a screw (73). The bracket (71) is mounted on the cylinder of the first hydraulic cylinder (50). The nut (72) is mounted on the bracket (71). The screw (73) is threadedly engaged with the nut (72). The screw (73) is coaxially arranged with the first piston rod (54). The screw (73) is rotatably connected to the first piston rod (54), and the screw (73) is configured to not move along the axial direction of the first piston rod (54).

3. The convenient replaceable orifice plate flow meter according to claim 2, characterized in that, A handwheel (74) is provided at the end of the screw (73) away from the first piston rod (54).

4. The convenient replaceable orifice plate flow meter according to claim 1, characterized in that, The outer wall of the third tube (40) is provided with two lugs (42), and each of the second piston rods (64) is connected to the corresponding lug (42).

5. The convenient replaceable orifice plate flow meter according to claim 4, characterized in that, Each of the lugs (42) corresponds to one of the elastic elements (80), and the two ends of the elastic element (80) are respectively connected to the second tube (20) and the corresponding lug (42).

6. The convenient replaceable orifice plate flow meter according to claim 5, characterized in that, The second end face (21) has a plurality of first mounting grooves (23) recessed therein, and a first limiting protrusion (24) is provided in the first mounting groove (23). The side of the support ear (42) facing the second end face (21) is provided with a second limiting protrusion (421). The elastic element (80) is provided in the first mounting groove (23) and is respectively sleeved on the first limiting protrusion (24) and the second limiting protrusion (421).

7. The convenient replaceable orifice plate flow meter according to claim 1, characterized in that, The second end face (21) is recessed to form a second mounting groove (25). The second mounting groove (25) penetrates the outer wall of the second tube body (20) radially and forms a mounting notch. The perforated plate (30) cooperates with the second mounting groove (25) through the mounting notch. The second mounting groove (25) has a third wall surface (251) parallel to the second end face (21). The distance between the second end face (21) and the third wall surface (251) is greater than the thickness of the perforated plate (30). The third tube (40) can push the perforated plate (30) to move so that the second wall surface seals against the third wall surface (251).

8. The convenient replaceable orifice plate flow meter according to claim 1, characterized in that, It also includes multiple connecting posts (100), which are distributed circumferentially along the first tube body (10), and the connecting posts (100) are respectively connected to the first end face (11) and the second end face (21).

9. The convenient replaceable orifice plate flow meter according to claim 1, characterized in that, The third tube (40) has a fourth end face (43) which is close to the first end face (11). The fourth end face (43) is provided with an annular protrusion (44) which surrounds the opening of the third tube (40). The first end face (11) is recessed to form an annular groove (13), the annular groove (13) surrounds the opening of the first tube body (10), and the annular protrusion (44) is sealed and fitted inside the annular groove (13).

10. The convenient replaceable orifice plate flow meter according to claim 9, characterized in that, The third tube (40) is provided with an extension ring (45). The outer wall of the extension ring (45) is sealed and fixed to the inner wall of the third tube (40). The extension ring (45) extends into the opening of the first tube (10). The outer wall of the extension ring (45) is sealed and fitted to the inner wall of the first tube (10).

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