Flow metering module for straight-through type ultrasonic gas meter

Abstract

The utility model discloses a flow metering module for a straight-through type ultrasonic gas meter. The flow metering module comprises a lower shell with a U-shaped section, an upper shell, a flow channel pipe, an ultrasonic transducer group, a circuit board and an inner cover, the upper shell comprises an upper shell body, and the upper part of the upper shell body is provided with a front extension part and a rear extension part along the length direction; the lower shell and the upper shell are in butt joint up and down, and the lower shell and the upper shell body, the front extension part and the rear extension part correspondingly form a main cavity, a front pipe cavity and a rear pipe cavity; the flow channel pipe sequentially comprises an air inlet part, a flow channel body and an air outlet part; the inner cover and the runner body are positioned in the main cavity; the air inlet part is located in the front pipe cavity and forms an air inlet inserting groove with the end face of the front pipe cavity. The air outlet part is located in the rear pipe cavity and forms an air outlet inserting groove with the end face of the rear pipe cavity. The module structure prevents internal parts from mechanical damage such as external collision and friction, external noise interference is effectively resisted, and the accuracy of gas flow metering is improved. The inserting grooves provide supporting and fastening bases for pipeline connection.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meters, in particular to a flow metering module for a straight-through ultrasonic gas meter. Background Art

[0002] As shown in the patent document (CN119290093A), the flow metering module is the core component of the direct-through ultrasonic gas meter. It accurately measures the gas flow through ultrasonic technology, and has the characteristics of high precision, high stability and low power consumption, providing reliable data support for gas metering.

[0003] Based on the ultrasonic transit time measurement principle, the module consists of a flow channel and a pair of ultrasonic transducers. As gas flows through the channel, the transducers transmit ultrasonic signals upstream and downstream. Due to the influence of the gas flow, the ultrasonic wave propagates faster downstream and slower upstream. By precisely measuring the propagation time difference between the downstream and upstream ultrasonic signals, the gas velocity and flow rate are calculated using a formula.

[0004] The patent document (CN222353267U) discloses an ultrasonic metering module for integrated temperature and pressure detection, which includes a metering module, a channel cover, an adapter cable, a metering plate, a temperature and pressure cover, a sealing gasket, a sensor sealing sleeve and a terminal assembly. The various components are fixed without screws through buckles and sealing gaskets, reducing material and labor costs and improving assembly efficiency.

[0005] The patent document (CN217210997U) discloses a protective structure for an ultrasonic metering module and an ultrasonic metering module, wherein a gas channel and a flow channel are provided in the gas chamber, an ultrasonic transducer is provided in the flow channel, a gland is connected to the ultrasonic transducer, a receiving groove and a circuit board are provided in the fixed box, and sealing is achieved by filling sealant into the gland through a sealing passage.

[0006] The patent document (CN211783659U) discloses a protective structure for an ultrasonic metering module, including an ultrasonic metering module, a channel cover, adhesive-backed foam and an epoxy resin layer. The adhesive-backed foam is pasted on the channel cover, and the epoxy resin is filled between the inner wall of the channel cover and the adhesive-backed foam to form a sealing layer, reducing the use of glue and improving the sealing performance.

[0007] In these existing technologies, the flow channel and ultrasonic flowmeter are assembled and then glued together before being installed in the gas meter housing. In actual use, even with epoxy resin for reinforcement, the connection between the ultrasonic transducer and the circuit board can easily loosen. Furthermore, the exposed flow channel is susceptible to damage during transportation, causing deformation and thus affecting flow channel performance. This structure also has relatively weak noise immunity. Summary of the Invention

[0008] The technical problem to be solved by the utility model is to provide a flow metering module for a straight-through ultrasonic gas meter with better pressure and noise resistance.

[0009] The utility model solves the above technical problems by adopting the following technical solutions: a flow metering module for a straight-through ultrasonic gas meter, comprising a lower shell with a U-shaped cross section, an upper shell, a flow channel tube, an ultrasonic transducer group, a circuit board and an inner cover;

[0010] The inner cover is open upward and is located on the upper side of the flow tube. The circuit board is located in the inner cover. The ultrasonic transducer group is connected to the flow tube. The terminal of the ultrasonic transducer group is connected to the circuit board. The inner cover is encapsulated with glue.

[0011] The upper shell includes an upper shell body, and the upper portion of the upper shell body is provided with a front extension portion and a rear extension portion along the length direction; the lower shell is connected to the upper shell up and down, and the lower shell forms a main cavity, a front tubular cavity and a rear tubular cavity corresponding to the upper shell body, the front extension portion and the rear extension portion respectively;

[0012] The flow channel tube includes an air inlet part, a flow channel body and an air outlet part in sequence; the inner cover and the flow channel body are located in the main cavity; the air inlet part is located in the front tube cavity and is a distance away from the end face of the front tube cavity to form an air inlet plug-in groove; the air outlet part is located in the rear tube cavity and is a distance away from the end face of the rear tube cavity to form an air outlet plug-in groove.

[0013] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the outer diameters of the air inlet and the air outlet are both larger than the flow channel body, the inner section of the front extension is provided with a first ridge, and the inner section of the rear extension is provided with a second ridge, the air inlet is restricted outside the first ridge, and the air outlet is restricted outside the second ridge.

[0014] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: an L-shaped buckle portion is provided on the inner side of the lower edges on both sides of the upper shell, and the L-shaped buckle portion includes a shelf surface and a strip welding wall extending along the lower edge of the upper shell; the lower shell includes two lower shell side walls, and the lower shell side wall includes a strip docking surface and a strip top surface extending along the upper edge of the lower shell, the upper edge of the lower shell side wall is inserted into the L-shaped buckle portion, the strip top surface is in contact with the shelf surface, and the inner surface of the strip welding wall is tightly against the strip docking surface, and the welding wall and the strip docking surface are connected by welding.

[0015] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the strip-shaped butt joint surface includes a first upper vertical surface, a first inclined surface inclined outward from top to bottom, and a first lower vertical surface; the inner surface of the strip-shaped welding wall includes a second upper vertical surface corresponding to the strip-shaped butt joint surface, a second inclined surface inclined outward from top to bottom, and a second lower vertical surface.

[0016] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: a flow channel with a rectangular cross section is provided in the flow channel tube, and the flow channel extends to the end surfaces of the air inlet and the air outlet;

[0017] Rectifying grids are provided in the air inlet and the air outlet.

[0018] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the cross-section of the outer contour of the flow channel body is rectangular, the outer end portion of the air inlet portion is a rectangle with length and width dimensions larger than the flow channel body, and the flow channel body and the outer end portion of the air inlet portion are connected by an arc surface; the cross-section of the air outlet portion is annular, and the roots of the flow channel body and the air outlet portion are transitioned by an arc surface.

[0019] The preferred technical solution adopted by the present invention to solve the above technical problems is: ears protruding outward are provided on both sides of the rear end surface of the lower shell, and the ears are used to set fixing holes for fixing the air outlet pipe.

[0020] The preferred technical solution adopted by the present invention to solve the above technical problems is: the end surface of the rear extension portion is recessed inward at the lower portion to form an arc-shaped notch; and the outer contour of the ear piece is in the shape of an arc.

[0021] The preferred technical solution adopted by the present invention to solve the above technical problems is: a flow metering module for a straight-through ultrasonic gas meter, comprising a lower shell, an upper shell, a flow channel tube and an inner cover; the upper shell comprises an upper shell body, the upper portion of which is provided with a front extension portion and a rear extension portion along the length direction; the lower shell is connected to the upper shell in upper and lower directions, and the lower shell forms a main cavity, a front tube cavity and a rear tube cavity corresponding to the upper shell body, the front extension portion and the rear extension portion respectively;

[0022] The flow channel tube includes an air inlet portion, a flow channel body, and an air outlet portion in sequence; the inner cover and the flow channel body are located in the main cavity; the air inlet portion is located in the front tube cavity and is a distance away from the end surface of the front tube cavity to form an air inlet plug-in groove; the air outlet portion is located in the rear tube cavity and is a distance away from the end surface of the rear tube cavity to form an air outlet plug-in groove;

[0023] The outer diameters of the air inlet and the air outlet are both larger than the flow channel body, the inner section of the front extension portion is provided with a first ridge, and the inner section of the rear extension portion is provided with a second ridge, the air inlet is restricted outside the first ridge, and the air outlet is restricted outside the second ridge; the inner sides of the lower edges of both sides of the upper shell are provided with L-shaped buckling portions, and the L-shaped buckling portions include a shelf surface and a strip welding wall extending along the lower edge of the upper shell; the lower shell includes two lower shell side walls, and the lower shell side walls include a strip docking surface and a strip top surface extending along the upper edge of the lower shell, the upper edge of the lower shell side wall is inserted into the L-shaped buckling portion, the strip top surface abuts the shelf surface, the inner surface of the strip welding wall is tightly against the strip docking surface, and the welding wall and the strip docking surface are connected by welding.

[0024] The preferred technical solution adopted by the present invention to solve the above technical problems is as follows: the strip-shaped butt joint surface includes, from top to bottom, a first upper vertical surface, a first inclined surface inclined outward from top to bottom, and a first lower vertical surface; the inner surface of the strip-shaped welding wall includes a second upper vertical surface corresponding to the strip-shaped butt joint surface, a second inclined surface inclined outward from top to bottom, and a second lower vertical surface;

[0025] The rear end surface of the lower shell is provided with outwardly protruding ears on both sides, and the ears are used to set fixing holes for fixing the air outlet pipe;

[0026] The end surface of the rear extension portion is concave inward at the lower portion to form an arc-shaped notch; the outer contour of the ear piece is in the shape of an arc.

[0027] Compared with existing technologies, the advantages of this utility model are: the upper and lower shells form a housing cavity that encloses the flow tube, ultrasonic transducer assembly, and inner cover, forming a modular structure. This protects the internal components from mechanical damage such as external collisions and friction, greatly reducing the risk of damage during transportation and improving product yield and durability. The shell can effectively resist external noise interference, improving the accuracy of gas flow measurement. In addition, the air inlet and outlet sockets provide support and fastening for pipe connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may contain exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0029] Figure 1 A three-dimensional structure of a flow meter module for a straight-through ultrasonic gas meter Figure 1 ;

[0030] Figure 2 A three-dimensional structure of a flow meter module for a straight-through ultrasonic gas meter Figure 2 ;

[0031] Figure 3 This is an exploded view of a flow meter module for a straight-through ultrasonic gas meter;

[0032] Figure 4 This is a schematic diagram of an upper shell of a flow meter module for a straight-through ultrasonic gas meter;

[0033] Figure 5 This is a diagram showing the coordination of the upper shell, flow channel tube, and inner cover of a flow meter module for a straight-through ultrasonic gas meter;

[0034] Figure 6 Schematic diagram of the optimized structure of the strip welding wall and the strip butt surface Figure 1 ;

[0035] Figure 7 Schematic diagram of the optimized structure of the strip welding wall and the strip butt surface Figure 2 .

[0036] Reference numerals:

[0037] Lower shell 1; upper shell 2; flow channel tube 3; inner cover 4; upper shell body 21; front extension portion 22; rear extension portion 23; air inlet portion 31; flow channel body 32; air outlet portion 33; air outlet plug-in groove 122; first convex ridge 220; second convex ridge 230; L-shaped buckle portion 24; shelf surface 241; strip welding wall 242; lower shell side wall 11; strip docking surface 111; strip top surface 112; first upper vertical surface 101; first inclined surface 102; first lower vertical surface 103; second upper vertical surface 201; second inclined surface 202; second lower vertical surface 203; ear piece 12; arc-shaped recess 25. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0039] It should be noted that like reference numerals denote like items in the following drawings, and therefore, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships in which the product of the present invention is usually placed when in use, and may be inconsistent with the directions in the drawings. They are only for the convenience of describing the present invention based on the same reference and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0041] like Figure 1-3 As shown, this embodiment provides a flow metering module for a straight-through ultrasonic gas meter, comprising a lower housing 1 with a U-shaped cross-section, an upper housing 2, a flow tube 3, an ultrasonic transducer assembly, a circuit board, and an inner cover 4. The inner cover 4 is upwardly open and located above the flow tube 3. The circuit board is located within the inner cover 4. The ultrasonic transducer assembly is connected to the flow tube 3, and its terminals are connected to the circuit board. The inner cover 4 is potted with glue to encapsulate the module.

[0042] like Figure 3-5 As shown, the upper shell 2 includes an upper shell body 21, and the upper part of the upper shell body 21 is provided with a front extension part 22 and a rear extension part 23 along the length direction. The lower shell 1 is connected to the upper shell 2 up and down, and the lower shell 1 forms a main cavity, a front tube cavity and a rear tube cavity corresponding to the upper shell body 21, the front extension part 22 and the rear extension part 23 respectively. As shown in the figure, the flow channel tube 3 includes an air inlet part 31, a flow channel body 32 and an air outlet part 33 in sequence. The inner cover 4 and the flow channel body 32 are located in the main cavity. The air inlet part 31 is located in the front tube cavity and is a distance away from the end face of the front tube cavity to form an air inlet plug groove. The air outlet part 33 is located in the rear tube cavity and is a distance away from the end face of the rear tube cavity to form an air outlet plug groove 122.

[0043] As can be seen in this embodiment, the upper shell 2 and the lower shell 1 form a housing cavity that encloses the flow tube 3, ultrasonic transducer assembly, and inner cover 4, forming a modular structure. This design protects the flow tube 3, ultrasonic transducer assembly, and circuit components within the inner cover 4 during transportation and assembly, shielding them from mechanical damage such as external collisions and friction. This significantly reduces the risk of damage during transportation and improves the product's yield and durability. Furthermore, during actual operation of the gas meter, the housing effectively resists external noise interference, creating a low-noise and stable environment for fluid detection, ensuring the precise transmission and reception of ultrasonic signals, and thus improving the accuracy of gas flow measurement.

[0044] The upper shell 2 and the lower shell 1 also form an air inlet and air outlet slots 122 at the outer ends of the flow tube 3. The air inlet slot is used to connect to the air inlet pipe, and the air outlet slot 122 is used to connect to the air outlet pipe, thereby achieving docking of the air inlet and air outlet pipes with the flow tube 3. The air inlet and air outlet slots 122 provide support and a secure foundation for the pipe connections. During actual installation, once the pipe is inserted into the slots, it is firmly secured, greatly preventing the pipe from slipping due to factors such as vibration and pressure fluctuations. This ensures stable connectivity of the gas transmission path, effectively prevents safety hazards such as gas leaks, and improves the safety and reliability of the gas meter.

[0045] In addition, from a structural point of view, it can be seen that the front extension portion 22 and the rear extension portion 23 are partial extensions of the upper part of the upper shell body 21, avoiding an overly large design of the entire shell. Such a layout fully optimizes space utilization. While ensuring the overall functionality of the module, it effectively controls the module volume so that it is not too large, which facilitates flexible arrangement within a limited installation space.

[0046] like Figure 3-5 As shown, the outer diameters of the air inlet 31 and the air outlet 33 are both larger than the flow channel body 32. The inner section of the front extension 22 is provided with a first ridge 220, and the inner section of the rear extension 23 is provided with a second ridge 230. The air inlet 31 is confined outside the first ridge 220, and the air outlet 33 is confined outside the second ridge 230. In other words, the stepped structure formed by the air inlet 31 and the air outlet 33 having outer diameters larger than the flow channel body 32, combined with the first ridge 220 and the second ridge 230 of the inner sections of the front extension 22 and the rear extension 23 of the upper shell 2, precisely limits the flow channel tube 3, ensuring that the flow channel tube 3 always maintains a stable position and posture within the upper shell 2 and the lower shell 1. This provides a reliable physical structure for accurate gas metering and facilitates the rapid and accurate installation and positioning of various components during the production and assembly process, thereby improving production efficiency.

[0047] like Figure 3-4 As shown, L-shaped buckling portions 24 are provided on the inner sides of the lower edges of both sides of the upper shell 2. The L-shaped buckling portions 24 include a resting surface 241 extending along the lower edge of the upper shell 2 and a strip-shaped welding wall 242. The lower shell 1 includes two lower shell side walls 11. The lower shell side walls 11 include a strip-shaped mating surface 111 and a strip-shaped top surface 112 extending along the upper edge of the lower shell 1. The upper edge of the lower shell side wall 11 is inserted into the L-shaped buckling portion 24. The strip-shaped top surface 112 abuts against the resting surface 241. The inner surface of the strip-shaped welding wall 242 abuts against the strip-shaped mating surface 111. The strip-shaped welding wall 242 is connected to the strip-shaped mating surface 111 by welding.

[0048] This docking method includes the vertical docking of the resting surface 241 with the strip top surface 112, and the lateral docking of the strip welding wall 242 with the strip docking surface 111, thus establishing a tight sealing system in two directions, greatly enhancing the firmness and sealing effect of the module docking point. Compared with traditional docking methods, this structure is more conducive to docking and positioning, preventing the two components from shifting during welding. Even if the weld has gaps, the structure itself can prevent external impurities, dust, and moisture from invading the module through the docking gap, thereby extending the module's service life and ensuring the stability and reliability of the gas meter during long-term use.

[0049] like Figure 6-7 As shown, in a preferred embodiment, the strip-shaped butt joint surface 111 comprises, from top to bottom, a first upper vertical surface 101, a first inclined surface 102 that slopes outward from top to bottom, and a first lower vertical surface 103. The inner surface of the strip-shaped welding wall 242 comprises a second upper vertical surface 201 corresponding to the strip-shaped butt joint surface 111, a second inclined surface 202 that slopes outward from top to bottom, and a second lower vertical surface 203. The addition of inclined surfaces at the contact points increases the contact area while improving the positioning and fit of the splice. It also reduces heat concentration during welding, avoids over-welding or weld-through, and improves the welding quality and pass rate of the workpiece.

[0050] like Figure 3 、 5 As shown, the flow channel tube 3 is provided with a rectangular cross-section flow channel, which extends to the end surfaces of the air inlet 31 and the air outlet 33. The air inlet 31 and the air outlet 33 are provided with rectifying grids. The outer contour of the flow channel body 32 is rectangular in cross-section. The outer end of the air inlet 31 is a rectangle with both length and width larger than the flow channel body 32. The flow channel body 32 and the outer end of the air inlet 31 are connected by an arc surface. The air outlet 33 has a circular cross-section, and the base of the flow channel body 32 and the air outlet 33 is connected by an arc surface.

[0051] like Figure 1 As shown, outwardly protruding ears 12 are provided on both sides of the rear end surface of the lower shell 1, and the ears 12 are used to set fixing holes for fixing the air outlet pipe.

[0052] The design of the tab 12 provides a convenient mounting location for the outlet pipe, simplifying the installation process and improving installation efficiency. Preferably, the outer contour of the tab 12 is arc-shaped. This, to a certain extent, avoids potential safety hazards caused by sharp edges, such as scratches on installers, reflecting the user-friendly design and careful consideration of details. It also prevents damage to the pipeline.

[0053] like Figure 1 、 4As shown, the end surface of the rear extension 23 is recessed inwardly at the bottom to form an arcuate notch 25. This arcuate notch provides the air outlet pipe with a larger turning space, which is more conducive to pipeline connection.

[0054] The above describes the flow meter module for a straight-through ultrasonic gas meter provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are intended only to facilitate understanding of the present invention and its core concepts. It should be noted that those skilled in the art may, without departing from the principles of the present invention, make various improvements and modifications to the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A flow meter module for a straight-through ultrasonic gas meter, characterized by: It includes a lower shell with a U-shaped cross section, an upper shell, a flow channel tube, an ultrasonic transducer group, a circuit board and an inner cover; The inner cover is open upward and is located on the upper side of the flow tube. The circuit board is located in the inner cover. The ultrasonic transducer group is connected to the flow tube. The terminal of the ultrasonic transducer group is connected to the circuit board. The inner cover is encapsulated with glue. The upper shell includes an upper shell body, and the upper portion of the upper shell body is provided with a front extension portion and a rear extension portion along the length direction; the lower shell is connected to the upper shell up and down, and the lower shell forms a main cavity, a front tubular cavity and a rear tubular cavity corresponding to the upper shell body, the front extension portion and the rear extension portion respectively; The flow channel tube includes an air inlet part, a flow channel body and an air outlet part in sequence; the inner cover and the flow channel body are located in the main cavity; the air inlet part is located in the front tube cavity and is a distance away from the end face of the front tube cavity to form an air inlet plug-in groove; the air outlet part is located in the rear tube cavity and is a distance away from the end face of the rear tube cavity to form an air outlet plug-in groove.

2. A flow metering module for a straight-through ultrasonic gas meter according to claim 1, characterized in that: The outer diameters of the air inlet and the air outlet are both larger than the flow channel body, the inner section of the front extension is provided with a first ridge, the inner section of the rear extension is provided with a second ridge, the air inlet is restricted outside the first ridge, and the air outlet is restricted outside the second ridge.

3. The flow meter module for a straight-through ultrasonic gas meter according to claim 1, characterized in that: An L-shaped buckle portion is provided on the inner side of the lower edges of both sides of the upper shell, and the L-shaped buckle portion includes a shelf surface and a strip welding wall extending along the lower edge of the upper shell; the lower shell includes two lower shell side walls, and the lower shell side walls include a strip docking surface and a strip top surface extending along the upper edge of the lower shell, the upper edge of the lower shell side wall is inserted into the L-shaped buckle portion, the strip top surface is in contact with the shelf surface, and the inner surface of the strip welding wall is tightly against the strip docking surface, and the strip welding wall and the strip docking surface are connected by welding.

4. A flow metering module for a straight-through ultrasonic gas meter according to claim 3, characterized in that: The strip-shaped butt joint surface includes a first upper vertical surface, a first inclined surface inclined outward from top to bottom, and a first lower vertical surface; the inner surface of the strip-shaped welding wall includes a second upper vertical surface corresponding to the strip-shaped butt joint surface, a second inclined surface inclined outward from top to bottom, and a second lower vertical surface.

5. The flow meter module for a straight-through ultrasonic gas meter according to claim 4, characterized in that: A flow channel with a rectangular cross section is provided in the flow channel tube, and the flow channel extends to the end surfaces of the air inlet and the air outlet; Rectifying grids are provided in the air inlet and the air outlet.

6. A flow metering module for a straight-through ultrasonic gas meter according to claim 5, characterized in that: The cross-section of the outer contour of the flow channel body is rectangular, the outer end portion of the air inlet portion is a rectangle with both length and width dimensions larger than the flow channel body, and the flow channel body and the outer end portion of the air inlet portion are connected by an arc surface; the cross-section of the air outlet portion is annular, and the roots of the flow channel body and the air outlet portion are transitioned by an arc surface.

7. The flow meter module for a straight-through ultrasonic gas meter according to claim 5, characterized in that: Both sides of the rear end surface of the lower shell are provided with outwardly protruding ears, and the ears are used to set fixing holes for fixing the air outlet pipe.

8. The flow meter module for a straight-through ultrasonic gas meter according to claim 7, characterized in that: The end surface of the rear extension portion is concave inward at the lower portion to form an arc-shaped notch; the outer contour of the ear piece is in the shape of an arc.

9. A flow meter module for a straight-through ultrasonic gas meter, characterized in that: The housing comprises a lower shell, an upper shell, a flow channel and an inner cover; the upper shell comprises an upper shell body, the upper portion of which is provided with a front extension and a rear extension along the length direction; the lower shell is connected to the upper shell up and down, and the lower shell, the upper shell body, the front extension and the rear extension respectively form a main cavity, a front tube cavity and a rear tube cavity; The flow channel tube includes an air inlet portion, a flow channel body, and an air outlet portion in sequence; the inner cover and the flow channel body are located in the main cavity; the air inlet portion is located in the front tube cavity and is a distance away from the end surface of the front tube cavity to form an air inlet plug-in groove; the air outlet portion is located in the rear tube cavity and is a distance away from the end surface of the rear tube cavity to form an air outlet plug-in groove; The outer diameters of the air inlet and the air outlet are both larger than the flow channel body, the inner section of the front extension portion is provided with a first ridge, and the inner section of the rear extension portion is provided with a second ridge, the air inlet is restricted outside the first ridge, and the air outlet is restricted outside the second ridge; the inner sides of the lower edges of both sides of the upper shell are provided with L-shaped buckling portions, and the L-shaped buckling portions include a shelf surface and a strip welding wall extending along the lower edge of the upper shell; the lower shell includes two lower shell side walls, and the lower shell side walls include a strip docking surface and a strip top surface extending along the upper edge of the lower shell, the upper edge of the lower shell side wall is inserted into the L-shaped buckling portion, the strip top surface abuts the shelf surface, the inner surface of the strip welding wall is tightly against the strip docking surface, and the welding wall and the strip docking surface are connected by welding.

10. The flow meter module for a straight-through ultrasonic gas meter according to claim 9, characterized in that: The strip-shaped butt joint surface includes, from top to bottom, a first upper vertical surface, a first inclined surface inclined outward from top to bottom, and a first lower vertical surface; the inner surface of the strip-shaped welding wall includes a second upper vertical surface corresponding to the strip-shaped butt joint surface, a second inclined surface inclined outward from top to bottom, and a second lower vertical surface; The rear end surface of the lower shell is provided with outwardly protruding ears on both sides, and the ears are used to set fixing holes for fixing the air outlet pipe; The end surface of the rear extension portion is concave inward at the lower portion to form an arc-shaped notch; the outer contour of the ear piece is in the shape of an arc.

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