Karman vortex flow meter assembly

Abstract

The utility model provides a Karman vortex flowmeter assembly, and relates to the field of flowmeters. The flow meter comprises a mounting mechanism and a flow meter body, the mounting mechanism comprises a fixing base, an elastic part and a mounting plate, a fixing through hole allowing a bolt to penetrate is formed in the fixing base, the fixing base is provided with a first limiting face and a second limiting face which are oppositely arranged in the first direction, the elastic part is fixed to the first limiting face, and the mounting plate is connected with the elastic part. The elastic piece is used for enabling the mounting plate to have a trend of moving close to the second limiting surface; a first concave-convex structure is arranged on the mounting plate, a second concave-convex structure is arranged on a shell of the flow meter main body, and the first concave-convex structure and the second concave-convex structure are clamped and matched and are relatively fixed in the first direction; the first concave-convex structure and the second concave-convex structure are detachably matched in a sliding mode in the second direction perpendicular to the first direction. The flowmeter is convenient to install, not prone to vibration force and safe and reliable to use.

Description

Technical Field

[0001] The utility model relates to the field of flow meters, in particular to a Karman vortex flow meter assembly. Background Art

[0002] The turbine flowmeter can also be called a vortex flowmeter. Its working principle is: the power of the flowing fluid drives the turbine blades to rotate, and its rotation speed is approximately proportional to the volume flow rate. The fluid volume indication passing through the flowmeter is based on the number of revolutions of the turbine impeller. Turbine flowmeters are widely used in the fields of petroleum, chemical industry, electric power, gas pipeline networks, urban gas, etc., and are widely used in trade settlements due to their high measurement accuracy, good repeatability and stability, wide measuring range, rapid response to flow changes, strong anti-interference ability, and easy signal transmission. In the prior art, the turbine flowmeter is generally provided with four mounting holes on its casing, and bolts are passed through each mounting hole, and the turbine flowmeter is fixed at a set position by bolts.

[0003] The inventor has found that the existing installation of vortex flowmeters has at least the following disadvantages:

[0004] It is fixed with bolts and the assembly structure is rigid and cannot adapt to vibration scenarios. Utility Model Content

[0005] The utility model aims to provide a Karman vortex flowmeter assembly, which can adapt to vibration scenarios, is not easy to be damaged, and is not easy to affect the measurement accuracy due to vibration.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides a Karman vortex flowmeter assembly, comprising:

[0008] A mounting mechanism and a flowmeter body, wherein the mounting mechanism comprises a fixed base, an elastic member and a mounting plate, wherein the fixed base is provided with a fixing through hole for bolts to pass through, and the fixed base has a first limiting surface and a second limiting surface which are relatively arranged in a first direction, the elastic member is fixed on the first limiting surface, and the mounting plate is connected to the elastic member, and the elastic member is used to make the mounting plate have a tendency to move close to the second limiting surface; a first concave-convex structure is provided on the mounting plate, and a second concave-convex structure is provided on the outer shell of the flowmeter body, the first concave-convex structure is snap-fitted with the second concave-convex structure, the first concave-convex structure and the second concave-convex structure are relatively fixed in the first direction, and the first concave-convex structure and the second concave-convex structure can be detachably slidably fitted in a second direction perpendicular to the first direction.

[0009] In an optional embodiment, the mounting plate has a first positioning plate surface, the first concave-convex structure is convexly arranged on the first positioning plate surface, and the first concave-convex structure extends in the second direction; the first positioning plate surface has a first side and a second side opposite to each other in the second direction, one end of the first concave-convex structure is flush with the first side, and the other end of the first concave-convex structure is spaced apart from the second side.

[0010] Based on the above scheme, by designing the length of the first concave-convex structure to be smaller than the length of the first positioning plate surface, when the first concave-convex structure and the second concave-convex structure are plugged together to realize the connection between the outer shell and the mounting plate, the first positioning plate surface can play a role in supporting the outer shell, increase the contact area, and improve the stability of the installation.

[0011] In an optional embodiment, the outer contour of the cross section of the first concave-convex structure is a dovetail shape, an inverted T shape, or a major arc shape, and the cross section is a plane perpendicular to the second direction.

[0012] Based on the above scheme, the shapes of the first concave-convex structure and the second concave-convex structure match, and a better fixing effect can be achieved by setting a dovetail-shaped, inverted T-shaped or arc-shaped snap-fit ​​structure. When the first concave-convex structure and the second concave-convex structure are snap-fitted, the flowmeter body is not easy to detach from the mounting plate in the first direction, and the two are tightly and reliably matched.

[0013] In an optional embodiment, the shell has a second positioning plate surface and a mounting side surface connected to the second positioning plate surface, the second concave-convex structure is convexly provided on the mounting side surface, and the second concave-convex structure extends in the second direction; the first positioning plate surface is in contact with the second positioning plate surface.

[0014] Based on the above solution, when the first concave-convex structure and the second concave-convex structure are snap-fitted, the first positioning plate surface and the second positioning plate surface can fit together, thereby increasing the contact area between the housing and the mounting plate and improving assembly stability.

[0015] In an optional embodiment, a first positioning hole is provided on the first positioning plate surface, and a second positioning hole is provided on the second positioning plate surface. Removable positioning pins are inserted into both the first positioning hole and the second positioning hole.

[0016] Based on the above scheme, when the first concave-convex structure and the second concave-convex structure are snapped into the set position, the first positioning hole and the second positioning hole are aligned, and the pin is inserted into the first positioning hole and the second positioning hole, thereby limiting the freedom of the first concave-convex structure and the second concave-convex structure in the second direction, preventing the shell from falling off the mounting plate.

[0017] In an optional embodiment, a limiting frame is installed on the shell, and a limiting protrusion is arranged on the outer peripheral surface of the positioning pin, the positioning pin and the limiting frame are slidably matched, and the limiting protrusion is located between the shell and the mounting plate; a spring is externally connected to the positioning pin, one end of the spring abuts against the limiting frame, and the other end of the spring abuts against the limiting protrusion, and the spring is used to make the positioning pin have a movement tendency to be inserted into the first positioning hole and the second positioning hole.

[0018] Based on the above scheme, under normal conditions, the latch is always inserted into the second positioning hole and extends out of the second positioning hole. When the housing needs to be matched with the mounting plate, the latch is lifted up to retract into the second positioning hole, and then the first concave-convex structure and the second concave-convex structure are engaged and matched, the latch is released, and when the housing slides relative to the mounting plate to achieve assembly, the latch always slides relative to the first positioning plate surface, and when the housing and the mounting plate slide into place, the first positioning hole and the second positioning hole are aligned, and the latch is directly inserted into the first positioning hole to achieve automatic limit.

[0019] In an optional embodiment, the limiting protrusion is configured as an annular protrusion surrounding the positioning pin.

[0020] Based on the above solution, the contact area between the spring and the limiting protrusion is large, and the elastic force is stable and reliable.

[0021] In an optional embodiment, the first concavo-convex structure is configured as a strip-shaped protrusion, and the second concavo-convex structure is configured as a strip-shaped groove, the notch of the strip-shaped groove is widened to form a guide groove section, and the strip-shaped protrusion can enter the strip-shaped groove from the guide groove section.

[0022] Based on the above solution, the cooperation between the first concave-convex structure and the second concave-convex structure is simple and reliable.

[0023] In an optional embodiment, the groove width of the guide groove section gradually decreases in a direction from one end close to the strip-shaped protrusion to the other end.

[0024] Based on the above solution, when the first concave-convex structure and the second concave-convex structure are plugged together, interference is not easy to occur, and the first concave-convex structure is easy to insert into the second concave-convex structure, thereby reducing the difficulty of assembly and improving the assembly efficiency.

[0025] In an optional embodiment, a positioning column is provided on the first limiting surface, the elastic member is sleeved outside the positioning column, and the end of the positioning column away from the first limiting surface is spaced apart from the second limiting surface so that part of the elastic member protrudes from the positioning column.

[0026] Based on the above solution, the positioning column can stabilize the shape of the elastic member, so that the elastic member provides a stable elastic force.

[0027] The beneficial effects of the embodiments of the utility model are:

[0028] In summary, the Karman vortex flowmeter assembly provided in this embodiment is provided with a mounting mechanism, and the flowmeter body is mounted at a set position by using the mounting mechanism, and the mounting mechanism includes a fixed base, an elastic member and a mounting plate, and the mounting plate is positioned on the fixed base by the elastic member, and the mounting plate and the fixed base are in a floating fit, and when the vibration force is transmitted to the fixed base, the fixed base transmits the vibration force to the mounting plate, and the elastic member between the mounting plate and the fixed base can absorb the vibration force, thereby playing the role of energy absorption and buffering, and the vibration force received by the mounting plate is greatly reduced. The flowmeter body is connected to the mounting plate, and the vibration force received by the flowmeter body is reduced accordingly. The flowmeter body is not easily affected by the vibration force in terms of measurement accuracy, and is not easily shortened in the case of vibration force, which can reduce the frequency of inspection or repair and can reduce operating costs.

[0029] At the same time, since the shell and the mounting plate cooperate with each other through the first concave-convex structure and the second concave-convex structure, when the mounting mechanism is not needed, the shell can be removed from the mounting plate, so that the flow meter body can be used alone, which is suitable for assembly in locations with limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a Karman vortex flowmeter assembly from one perspective of an embodiment of the utility model;

[0032] Figure 2 This is a schematic diagram of a Karman vortex flowmeter assembly from another perspective according to an embodiment of the present invention.

[0033] icon:

[0034] 100-installation mechanism; 110-fixed base; 111-fixed through hole; 112-first limiting surface; 113-second limiting surface; 114-positioning column; 120-elastic member; 130-installation plate; 131-first concave-convex structure; 132-first positioning plate surface; 133-first positioning hole; 200-flow meter body; 210-housing; 220-second concave-convex structure; 230-second positioning plate surface; 240-second positioning hole; 250-latch pin; 251-limiting protrusion; 260-limiting frame; 270-spring; 300-guide column and guide sleeve structure. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example

[0042] Please combine Figure 1 In this embodiment, the Karman vortex flowmeter assembly includes a mounting mechanism 100 and a flowmeter body 200. The mounting mechanism 100 includes a fixed base 110, an elastic member 120 and a mounting plate 130. The fixed base 110 is provided with four fixing through holes 111 for bolts to pass through, and the four fixing through holes 111 are located at the four corners of the same rectangle. A bolt is passed through each fixing through hole 111, and the four bolts can improve the fastening effect. The fixed base 110 is roughly U-shaped, and the fixed base 110 is provided with two inverted folded edges at the opening of the U-shape. The side surface of each folded edge close to the bottom of the U-shape is a limiting surface, and correspondingly, the bottom surface of the fixed base 110 is also a limiting surface. For the convenience of description, the limiting surface at the bottom is the first limiting surface 112, and the limiting surface at the top is the second limiting surface 113. There are two second limiting surfaces 113, and the two second limiting surfaces 113 are located in the same plane. The elastic members 120 are arranged in two rows, and a plurality of elastic members 120 can be arranged in each row. The elastic members 120 can be springs 270, etc. The mounting plate 130 is connected to the two rows of elastic members 120 at the same time. The elastic members 120 are used to make the mounting plate 130 have a tendency to move close to the second limiting surface 113, that is, under normal conditions, the two rows of elastic members 120 are in a compressed state, and the mounting plate 130 abuts against the second limiting surface 113.

[0043] At the same time, a first concave-convex structure 131 is provided on the side of the mounting plate 130 facing away from the elastic member 120, and a second concave-convex structure 220 is provided on the outer shell 210 of the flow meter body 200. The first concave-convex structure 131 is snap-fitted with the second concave-convex structure 220. The first concave-convex structure 131 and the second concave-convex structure 220 are relatively fixed in a first direction, and the first concave-convex structure 131 and the second concave-convex structure 220 can be detachably slidably fitted in a second direction perpendicular to the first direction.

[0044] With such a design, the mounting plate 130 is positioned on the fixed base 110 by means of the elastic member 120, and the mounting plate 130 and the fixed base 110 are in a floating fit. When the vibration force is transmitted to the fixed base 110, the fixed base 110 transmits the vibration force to the mounting plate 130, and the elastic member 120 between the mounting plate 130 and the fixed base 110 can absorb the vibration force, thereby playing the role of energy absorption and buffering, and the vibration force received by the mounting plate 130 is greatly reduced. The flow meter body 200 is connected to the mounting plate 130, and the vibration force received by the flow meter body 200 is correspondingly reduced. The flow meter body 200 is not easily affected by the vibration force to affect the measurement accuracy, and it is not easy to shorten the life due to being in the scene of vibration force, which can reduce the frequency of inspection or maintenance and reduce the operating cost.

[0045] At the same time, since the shell 210 cooperates with the mounting plate 130 through the first concave-convex structure 131 and the second concave-convex structure 220, when the mounting mechanism 100 is not needed, the shell 210 can be removed from the mounting plate 130, so that the flow meter body 200 can be used alone, which is suitable for assembly in locations with limited space.

[0046] The details of the Karman vortex flowmeter assembly according to the embodiment of the present application are described below by way of examples.

[0047] Please combine Figure 1 and Figure 2 In this embodiment, optionally, the mounting plate 130 has a first positioning plate surface 132, and the first concavo-convex structure 131 is convexly arranged on the first positioning plate surface 132, and the first concavo-convex structure 131 extends in the second direction. The first positioning plate surface 132 has a first side and a second side opposite to each other in the second direction, one end of the first concavo-convex structure 131 is flush with the first side, and the other end of the first concavo-convex structure 131 is spaced from the second side. At the same time, the first concavo-convex structure 131 can be a strip-shaped protrusion, and the number of the first concavo-convex structure 131 can be multiple, and the multiple first concavo-convex structures 131 are evenly spaced and arranged in the width direction of the first positioning plate surface 132. The multiple first concavo-convex structures 131 can be set to be the same for easy processing. Correspondingly, the second concavo-convex structure 220 is set to a strip-shaped groove, and the notch of the strip-shaped groove is widened to form a guide groove section, and the strip-shaped protrusion can enter the strip-shaped groove from the guide groove section. It should be understood that the number of the strip-shaped grooves is equal to the number of the strip-shaped protrusions, and each strip-shaped protrusion can be plugged into the corresponding strip-shaped groove.

[0048] It should be noted that by designing the length of the first concave-convex structure 131 to be smaller than the length of the first positioning plate surface 132, when the first concave-convex structure 131 and the second concave-convex structure 220 are plugged together to realize the connection between the housing 210 and the mounting plate 130, the first positioning plate surface 132 can play a role in supporting the housing 210, increasing the contact area and improving the stability of the installation. In addition, due to the design of the guide groove section, when the first concave-convex structure 131 and the second concave-convex structure 220 are plugged together, it is not easy to cause interference, and the first concave-convex structure 131 is easy to be inserted into the second concave-convex structure 220, reducing the difficulty of assembly and improving the assembly efficiency.

[0049] Optionally, the outer contour of the cross section of the first concave-convex structure 131 is a dovetail shape, an inverted T shape, or a major arc shape, and the cross section is a plane perpendicular to the second direction. The shapes of the first concave-convex structure 131 and the second concave-convex structure 220 match, and by setting the first concave-convex structure 131 and the second concave-convex structure 220 with a dovetail shape, an inverted T shape, or a major arc shape, a better fixing effect can be achieved. When the first concave-convex structure 131 and the second concave-convex structure 220 are engaged, the flow meter body 200 is not easy to detach from the mounting plate 130 in the first direction, and the two are tightly and reliably matched.

[0050] In this embodiment, optionally, a positioning column 114 is provided on the first limiting surface 112, and the elastic member 120 is sleeved outside the positioning column 114, and the end of the positioning column 114 away from the first limiting surface 112 is spaced from the second limiting surface 113, so that part of the elastic member 120 is protruded from the positioning column 114. It should be understood that the number of the positioning columns 114 is equal to the number of the elastic members 120, each positioning column 114 can position one elastic member 120, and the positioning column 114 can stabilize the shape of the elastic member 120, so that the elastic member 120 provides a stable elastic force.

[0051] In this embodiment, optionally, the housing 210 has a second positioning plate surface 230 and a mounting side surface connected to the second positioning plate surface 230, the second concave-convex structure 220 is convexly provided on the mounting side surface, and the second concave-convex structure 220 extends in the second direction; the first positioning plate surface 132 is fitted with the second positioning plate surface 230. When the first concave-convex structure 131 and the second concave-convex structure 220 are snap-fitted, the first positioning plate surface 132 and the second positioning plate surface 230 can be fitted together, thereby increasing the contact area between the housing 210 and the mounting plate 130 and improving the stability of the assembly.

[0052] Furthermore, a first positioning hole 133 is provided on the first positioning plate surface 132 , and a second positioning hole 240 is provided on the second positioning plate surface 230 . Removable positioning pins 250 are inserted into both the first positioning hole 133 and the second positioning hole 240 .

[0053] With such a design, when the first concave-convex structure 131 and the second concave-convex structure 220 are snapped into the set position, the first positioning hole 133 and the second positioning hole 240 are aligned, and the latch 250 is inserted into the first positioning hole 133 and the second positioning hole 240, thereby limiting the freedom of the first concave-convex structure 131 and the second concave-convex structure 220 in the second direction, preventing the housing 210 from falling off the mounting plate 130.

[0054] Please combine Figure 2 Optionally, a limiting frame 260 is installed on the shell 210, and a limiting protrusion 251 is provided on the outer peripheral surface of the positioning pin 250. The positioning pin 250 and the limiting frame 260 can be slidably matched, and the limiting protrusion 251 is located between the shell 210 and the mounting plate 130; a spring 270 is connected to the outer shell of the positioning pin 250, one end of the spring 270 abuts against the limiting frame 260, and the other end of the spring 270 abuts against the limiting protrusion 251. The spring 270 is used to make the positioning pin 250 have a movement tendency to be inserted into the first positioning hole 133 and the second positioning hole 240.

[0055] It should be understood that, in a normal state, the latch 250 is always inserted in the second positioning hole 240 and extends out of the second positioning hole 240. When the housing 210 needs to be matched with the mounting plate 130, the latch 250 is lifted upward to retract into the second positioning hole 240, and then the first concave-convex structure 131 and the second concave-convex structure 220 are engaged and matched, and the latch 250 is released. When the housing 210 slides relative to the mounting plate 130 to achieve assembly, the latch 250 always slides relative to the first positioning plate surface 132. When the housing 210 and the mounting plate 130 slide into place, the first positioning hole 133 and the second positioning hole 240 are aligned, and the latch 250 is directly inserted into the first positioning hole 133 to achieve automatic limit.

[0056] Furthermore, the limiting protrusion 251 is configured as an annular protrusion surrounding the positioning latch 250. The contact area between the spring 270 and the limiting protrusion 251 is large, and the elastic force is stable and reliable.

[0057] It should be understood that the flow meter body 200 can adopt the structure of the existing well-known vortex flow meter. In order to avoid repeated description, its working principle and detailed structure are not described in detail here.

[0058] In addition, a guide column and guide sleeve structure 300 may be provided between the mounting plate 130 and the fixed base 110 to improve stability.

[0059] In the Karman vortex flowmeter assembly provided in this embodiment, the flowmeter body 200 is connected to the mounting plate 130, and the vibration force applied to the flowmeter body 200 is absorbed by the elastic member 120. The flowmeter body 200 is not easily affected by the vibration force in terms of measurement accuracy, and is not easily shortened in terms of life due to being in a vibration force scenario, which can reduce the frequency of overhaul or repair and can reduce operating costs. Since the housing 210 cooperates with the mounting plate 130 through the first concave-convex structure 131 and the second concave-convex structure 220, when the mounting mechanism 100 is not needed, the housing 210 can be removed from the mounting plate 130, so that the flowmeter body 200 can be used alone, which is suitable for assembly in locations with limited space.

[0060] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A Karman vortex flowmeter assembly, characterized in that: include: A mounting mechanism (100) and a flow meter body (200), wherein the mounting mechanism (100) comprises a fixed base (110), an elastic member (120) and a mounting plate (130), wherein the fixed base (110) is provided with a fixing through hole (111) for bolts to pass through, the fixed base (110) has a first limiting surface (112) and a second limiting surface (113) arranged opposite to each other in a first direction, the elastic member (120) is fixed on the first limiting surface (112), the mounting plate (130) is connected to the elastic member (120), and the elastic member (120) is used to allow the mounting plate (130) to be fixed to the flow meter body (200). 30) has a tendency to move close to the second limiting surface (113); a first concave-convex structure (131) is provided on the mounting plate (130), and a second concave-convex structure (220) is provided on the outer shell (210) of the flow meter body (200); the first concave-convex structure (131) and the second concave-convex structure (220) are snap-fitted; the first concave-convex structure (131) and the second concave-convex structure (220) are relatively fixed in the first direction; the first concave-convex structure (131) and the second concave-convex structure (220) are detachably slidably fitted in a second direction perpendicular to the first direction.

2. The Karman vortex flowmeter assembly according to claim 1, characterized in that: The mounting plate (130) has a first positioning plate surface (132), the first concave-convex structure (131) is convexly arranged on the first positioning plate surface (132), and the first concave-convex structure (131) extends in the second direction; the first positioning plate surface (132) has a first side and a second side opposite to each other in the second direction, one end of the first concave-convex structure (131) is flush with the first side, and the other end of the first concave-convex structure (131) is spaced apart from the second side.

3. The Karman vortex flowmeter assembly according to claim 2, characterized in that: The cross-sectional outer contour of the first concave-convex structure (131) is a dovetail shape, an inverted T shape or a major arc shape, and the cross-sectional area is a plane perpendicular to the second direction.

4. The Karman vortex flowmeter assembly according to claim 2, characterized in that: The housing (210) comprises a second positioning plate surface (230) and a mounting side surface connected to the second positioning plate surface (230); the second concave-convex structure (220) is convexly disposed on the mounting side surface; the second concave-convex structure (220) extends in the second direction; the first positioning plate surface (132) is in contact with the second positioning plate surface (230).

5. The Karman vortex flowmeter assembly according to claim 4, characterized in that: The first positioning plate surface (132) is provided with a first positioning hole (133), the second positioning plate surface (230) is provided with a second positioning hole (240), and the first positioning hole (133) and the second positioning hole (240) are both provided with detachable positioning pins (250).

6. The Karman vortex flowmeter assembly according to claim 5, characterized in that: A limiting frame (260) is installed on the housing (210), and a limiting protrusion (251) is arranged on the outer peripheral surface of the positioning pin (250). The positioning pin (250) and the limiting frame (260) are slidably matched, and the limiting protrusion (251) is located between the housing (210) and the mounting plate (130); a spring (270) is connected to the outer shell of the positioning pin (250), one end of the spring (270) is in contact with the limiting frame (260), and the other end of the spring (270) is in contact with the limiting protrusion (251), and the spring (270) is used to make the positioning pin (250) have a movement tendency to be inserted into the first positioning hole (133) and the second positioning hole (240).

7. The Karman vortex flowmeter assembly according to claim 6, characterized in that: The limiting protrusion (251) is configured as an annular protrusion surrounding the positioning latch (250).

8. The Karman vortex flowmeter assembly according to claim 1, characterized in that: The first concavo-convex structure (131) is configured as a strip-shaped protrusion, and the second concavo-convex structure (220) is configured as a strip-shaped groove, the notch of the strip-shaped groove is widened to form a guide groove section, and the strip-shaped protrusion can enter the strip-shaped groove from the guide groove section.

9. The Karman vortex flowmeter assembly according to claim 8, characterized in that: The groove width of the guide groove section gradually decreases in a direction from one end close to the strip-shaped protrusion to the other end.

10. The Karman vortex flowmeter assembly according to claim 1, characterized in that: A positioning column (114) is provided on the first limiting surface (112), the elastic member (120) is sleeved outside the positioning column (114), and an end of the positioning column (114) away from the first limiting surface (112) is spaced apart from the second limiting surface (113), so that a portion of the elastic member (120) protrudes from the positioning column (114).

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