Elastic ultrasonic resonator and ultrasonic gas meter sensor and metering module packaged by elastic ultrasonic resonator

Abstract

The invention relates to the technical field of ultrasonic gas meters, in particular to an elastic ultrasonic resonance body and an ultrasonic gas meter sensor and a metering module packaged by the elastic ultrasonic resonance body. The elastic ultrasonic resonance body comprises a piezoelectric assembly, an elastic vibration plate located on one side of the piezoelectric assembly and a conductive connection assembly connecting the piezoelectric assembly and the elastic vibration plate; the elastic vibration plate, the conductive connection assembly and the piezoelectric assembly are assembled in a laminated mode in the axis direction. The elastic vibration plate is a stainless steel plate or a titanium alloy plate; the elastic vibration plate has good elasticity, and the acoustic-electric conversion effect can be improved. According to the ultrasonic gas meter sensor obtained by packaging the elastic ultrasonic resonance body, the arrangement of a matching layer is reduced, sound energy can be gathered during emission, a sound signal is controlled to be transmitted in a narrow sound channel, the sound signal is emitted through a port with a small section, the influence of disturbance flow is reduced, the ultrasonic gas meter sensor is installed at the two ends of a Venturi flow channel to obtain a metering module, and the metering module is used for metering. The flow measurement accuracy and stability can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic gas meters, and particularly relates to an elastic ultrasonic resonator, an ultrasonic gas meter sensor and a metering module encapsulated therewith. Background Art

[0002] With the wide application of intelligent gas meters, the requirements for metering accuracy are continuously increasing. Due to the characteristics of no moving mechanical parts, high precision and wide range ratio, ultrasonic gas meters have been widely used in the fields of civil and industrial gas metering. However, in traditional ultrasonic gas meters, the signal reception quality and stability of ultrasonic sensors are poor, resulting in measurement deviations. When using ultrasonic sensors arranged in an axisymmetric and opposite manner in the Venturi flow channel, since the diameter of the emission end face of the matching layer is relatively large (the outer diameter of commonly used domestic brand ultrasonic sensors is about 14 mm), the cross-sectional area of the region through which the ultrasonic signal passes is relatively large, and any fluid disturbance in the passing region will affect the signal reception quality and stability. When the flow velocity is less than 0.6 m / s and the Reynolds number of the Venturi flow channel is less than 2300, the laminar flow state causes the flow velocity distribution to decrease significantly along the radial direction from the axis. Due to assembly deviations, the ultrasonic signal that should originally pass through the axis actually passes through the low-flow region outside the axis, which will cause a measurement deviation of 3-5%. On the other hand, when the flow velocity is greater than 0.6 m / s, the Reynolds number in the Venturi flow channel is greater than 2300, and the flow state will gradually transition to a turbulent state. A relatively obvious Karman vortex will be generated in the flow field near the end face of the ultrasonic sensor, and the irregular pulsating eddy current will cause a deviation in the flow measurement, which has an adverse impact on the actual application of the Venturi module in the urban gas industry.

[0003] The diameter and thickness of the matching layer of commonly used ultrasonic sensors in China are important control indicators for the natural frequency, resulting in relatively fixed external dimensions and unable to improve the flow field state by reducing the outer diameter. The existing ultrasonic gas meter sensor is an encapsulated structure in which a piezoelectric ceramic and a matching layer are connected and fixed with an adhesive. The emission end face of the matching layer is exposed and in direct contact with the measurement medium. The back end of the piezoelectric ceramic is filled with epoxy resin to quickly stop the damping oscillation. The piezoelectric ceramic and the matching layer of the oblate body form a resonator with a natural frequency to transmit and receive ultrasonic signals. This structure is easily affected by fluid disturbances at high flow velocities, resulting in measurement deviations. At the same time, the material of the traditional matching layer is epoxy resin mixed with micro hollow glass balls, which is a completely inelastic hardened object and lacks elasticity. It solely relies on the natural frequency to drive the overall axial vibration of the matching layer and the piezoelectric ceramic. Compared with a resonator with elasticity and resonance effect, under the same excitation voltage, the generated mechanical vibration amplitude is small and the electrical signal is weak, affecting the signal transmission and reception effects. If the excitation voltage is increased, it means an increase in energy consumption and also an increase in danger in an inflammable and explosive environment.

[0004] Therefore, without changing the piezoelectric mechanism or material, it is necessary to optimize the structure of the important components in the ultrasonic gas meter sensor so that it has elastic resonance performance, can improve the flow field state, reduce the influence of flow field disturbance, and at the same time maintain the stability and consistency of the flow meter to improve the signal quality and signal transmission effect. Summary of the Invention

[0005] In order to solve the problem of insufficient measurement accuracy and stability of the existing ultrasonic gas meter sensor at high flow rates, a new structure of ultrasonic gas meter sensor capable of resisting fluid disturbance at high flow rates is needed. Based on the above problems, the present invention provides an elastic ultrasonic resonator and its encapsulated ultrasonic gas meter sensor and metering module. Utilizing the resonance effect, with a smaller excitation voltage, the overall vibration amplitude of the resonator is significantly increased, the sound energy reception effect is improved, and at the same time, a hyperbolic inner cavity design is adopted, which can gather and emit sound energy, reduce the influence on the surrounding flow field, and improve the stability and measurement accuracy of flow metering; at the same time, the smaller excitation voltage reduces the energy consumption required for excitation and improves the intrinsic safety in the gas environment.

[0006] An elastic ultrasonic resonator includes a piezoelectric component, an elastic vibrating plate located on one side of the piezoelectric component, and a conductive connection component connecting the piezoelectric component and the elastic vibrating plate. The elastic vibrating plate, the conductive connection component, and the piezoelectric component are stacked and assembled along the axial direction.

[0007] Among them, the piezoelectric component includes at least two piezoelectric ceramic wafers and a copper foil located between the at least two piezoelectric ceramic wafers. The conductive connection component includes a copper conductor and a copper bushing installed at one end of the copper conductor. The elastic vibrating plate is a stainless steel plate or a titanium alloy plate.

[0008] Further, a first through hole is formed in the middle of the piezoelectric component, and the piezoelectric component is sleeved on the conductive connection component through the first through hole.

[0009] Further, positive metal coatings and negative metal coatings are respectively provided on both sides of the piezoelectric ceramic wafers in the piezoelectric component.

[0010] Further, a positioning groove is formed on one side of the elastic vibrating plate, and a plurality of concentric circular grooves with the same spacing are distributed on the other side surface; the shape of the concentric circular grooves matches the shape of the elastic vibrating plate.

[0011] Further, the copper bushing is of a convex structure and a second through hole is provided in the center.

[0012] Further, the copper conductor includes a copper tube and ribs provided on the outer surface of the copper tube, and the ribs and the copper tube are integrally formed.

[0013] Further, the shape of the protruding end of the copper bushing matches the shape of the positioning groove, and the conductive connection component is fitted into the positioning groove of the elastic vibrating plate through the protruding end.

[0014] Further, it also includes two wires, which are respectively welded to the copper foil of the piezoelectric component and the copper conductor of the conductive connection component; wherein, a wire channel is also provided on the copper conductor, and the wire welded to the copper foil passes through the wire channel to communicate with the outside, and the wire welded to the copper conductor directly communicates with the outside.

[0015] The present invention also provides a packaged ultrasonic gas meter sensor, including the elastic ultrasonic resonator and a packaging rectifier; the packaging rectifier is an integrated packaging structure, including a cylindrical shell and a hyperbolic shell connected to one side of the cylindrical shell, and the cylindrical shell and the hyperbolic shell are coaxially arranged;

[0016] A first chamber is provided inside the cylindrical shell, a second chamber is provided inside the hyperbolic shell, and the first chamber and the second chamber are communicated.

[0017] Further, the elastic ultrasonic resonator is packaged in the first chamber, and the first chamber is also filled with a resin filler.

[0018] Further, a flow guiding component is provided on the packaging rectifier, and the flow guiding component includes a plurality of flow guiding plates and a plurality of flow guiding grooves;

[0019] The plurality of flow guiding plates are arranged on the cylindrical shell outside the first chamber and are evenly distributed along the circumferential direction of the cylindrical shell; the plurality of flow guiding grooves are arranged on the hyperbolic shell outside the second chamber and are evenly distributed along the axial direction of the hyperbolic shell.

[0020] The present invention also provides a metering module of a packaged ultrasonic gas meter sensor, including a flow channel, the flow channel is a Venturi tube structure, and ultrasonic gas meter sensors with the same structure are respectively provided at the inlets and outlets at both ends of the flow channel. Among them, the directions of the two ultrasonic gas meter sensors are opposite and are coaxially arranged with the flow channel.

[0021] Further, a rectifying groove is provided at one end of the flow channel, and the rectifying groove is arranged circumferentially along the inner wall of the Venturi tube.

[0022] The advantages of the present invention are as follows:

[0023] 1. The elastic resonator provided by the present invention utilizes the resonance effect. With the elastic vibrating plate made of stainless steel or titanium alloy of the elastic resonator, similar to the sounding diaphragm of a speaker, it amplifies the signal sound energy, and can increase the overall vibration amplitude of the resonator with a relatively small excitation voltage. When receiving a signal, the same-frequency sound signal will trigger the resonance effect of the elastic resonator, causing a large amplitude vibration at the axial center of the elastic vibrating plate, and driving the piezoelectric ceramic to convert mechanical energy into an electrical signal with a relatively large amplitude.

[0024] 2. The present invention sets uniformly distributed concentric circular grooves on one side surface of the elastic vibrating plate, which can reduce the sound wave reflection and improve the sound energy reception effect; the concentric circular grooves increase the vibration amplitude at the center of the elastic vibrating plate and construct an elastic region with the maximum amplitude at the center.

[0025] 3. The present invention vertically connects two pieces of piezoelectric ceramics through a copper conductor. Compared with a single-piece piezoelectric ceramic, the sound-electric conversion effect is doubled; and through the hyperbolic inner cavity, it converges and emits sound energy, controls the ultrasonic beam to be concentrated in the axial center region of the Venturi flow channel, reduces the interface of the sound wave emission port, further reduces the influence on the nearby flow field, and improves the stability of flow measurement.

[0026] 4. The ultrasonic sensor and metering module provided by the present invention reduce the setting of the matching layer, encapsulate the elastic ultrasonic resonator in the hyperbolic cavity, can converge and emit sound energy, control the sound signal to propagate in a relatively narrow sound channel, make the flow state detected by the ultrasonic signal more concentrated in the axial center region of the flow channel, and the measured flow velocity range under the small Reynolds number flow state is stable in the maximum flow velocity distribution region at the axial center. At the same time, the ultrasonic signal is emitted through a port with a relatively small cross-section, which can effectively reduce the external dimension in contact with the flow field, reduce the influence of the disturbed flow, and improve the accuracy and stability of flow measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 are the schematic structural diagrams of the elastic ultrasonic resonator of the present invention at different angles ( Figure 1 a front view, Figure 1 b isometric side view, Figure 1 c sectional view, Figure 1 d side view);

[0028] Figure 2 is the exploded view of the elastic ultrasonic resonator of the present invention;

[0029] Figure 3 are the schematic structural diagrams of the elastic vibrating plate of the present invention ( Figure 3 a front view, Figure 3 b sectional schematic diagram);

[0030] Figure 4 are the schematic structural diagrams of the copper bushing of the present invention;

[0031] Figure 5 is a schematic structural diagram of the copper conductor of the present invention;

[0032] Figure 6 is a schematic cross-sectional structural diagram of the encapsulated rectifier of the present invention;

[0033] Figure 7 is a side view of the structure of the encapsulated rectifier of the present invention (the left side is an isometric left view, and the right side is an isometric right view);

[0034] Figure 8 are a schematic structural diagram before encapsulation and a schematic cross-sectional structural diagram after encapsulation of the ultrasonic gas meter sensor encapsulated by the elastic ultrasonic resonator of the present invention;

[0035] Figure 9 is a schematic cross-sectional structural diagram of the metering module composed of the ultrasonic gas meter sensor and the Venturi flow channel of the present invention;

[0036] Reference numerals:

[0037] 1, elastic vibrating plate; 11, positioning groove; 12, concentric circular grooves; 2, piezoelectric ceramic sheet; 21, first through hole; 22, positive metal coating; 23, negative metal coating; 3, copper foil; 4, copper bushing; 41, second through hole; 42, frustum; 43, protruding end; 5, copper conductor; 51, copper tube; 52, rib; 61, positive wire; 62, negative wire; 7, encapsulated rectifier; 71, first chamber; 72, second chamber; 73, cylindrical housing; 74, hyperbolic housing; 75, toroidal frustum; 8, resin filler; 9, flow guiding component; 91, flow guiding plate; 92, flow guiding groove; 10, elastic ultrasonic resonator; 20, flow channel; 30, rectifying groove. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] It should be noted that the installation methods and technical terms mentioned in the present invention are all well-known technical terms in the technical field, so no further explanation will be given. In addition, the same reference numerals are used for the same components, but this does not affect and should not constitute an accurate understanding of the technical solution by those skilled in the art.

[0040] Embodiment 1

[0041] This embodiment provides an elastic ultrasonic resonator, asFigure 1 As shown in Figure 1 Fig. a is a front view of the elastic ultrasonic resonator; Figure 1 Fig. b is an isometric view of the elastic ultrasonic resonator; Figure 1 Fig. c is a sectional view of the elastic ultrasonic resonator; Figure 1 Fig. d is a side view of the elastic ultrasonic resonator), which includes an elastic vibrating plate 1, a conductive connection component, and a piezoelectric component stacked and assembled along the axial direction. The piezoelectric component includes at least two piezoelectric ceramic sheets 2 and a copper foil 3 located between the at least two piezoelectric ceramic sheets 2 (in this embodiment, the piezoelectric component is composed of two piezoelectric ceramic sheets 2 and a copper foil 3 located between the two piezoelectric ceramic sheets 2). The elastic vibrating plate 1 is an elastic metal plate (in this embodiment, the elastic vibrating plate is a circular stainless steel plate), and the conductive connection component includes a copper conductor 5 and a copper bushing 4 sleeved at one end of the copper conductor 5.

[0042] As Figure 2 shown, a first through hole 21 is provided at the center of the piezoelectric component. The diameter of the first through hole 21 is the same as the outer diameter of the copper conductor 5. The piezoelectric component is sleeved on the copper conductor 5 through the first through hole 21. Positive metal coatings 22 and negative metal coatings 23 are respectively provided on both sides of the piezoelectric ceramic sheet 2.

[0043] As Figure 3 shown, a positioning groove 11 is provided at the radial center position of one side surface of the elastic vibrating plate 1, and a plurality of concentric circular grooves 12 with the same pitch are distributed on the other side surface (in this embodiment, the shape of the concentric circular grooves 12 matches the shape of the elastic vibrating plate 1).

[0044] As Figure 4 shown, the copper bushing 4 is a convex structure. The shape of the protruding end 43 matches the shape of the positioning groove 11 and is fitted into the positioning groove 11 of the elastic vibrating plate 1 (in this embodiment, the shapes of the boss 43 and the positioning groove 11 are both cylindrical). A second through hole 41 is provided at the center of the copper bushing 4. The diameter of the second through hole 41 is slightly smaller than the outer diameter of the copper conductor 5. The copper conductor 5 is riveted to the copper bushing 4 through the second through hole to form an interference fit.

[0045] As Figure 5 shown, the copper conductor 5 includes a copper tube 51 and ribs 52 provided on the outer surface of the copper tube 51 (in this embodiment, the ribs 52 and the copper tube 51 are integrally formed and are formed by stamping and curling a metal copper plate).

[0046] As Figure 2As shown, the copper conductor 5 sequentially passes through the first through-hole of the piezoelectric component and the second through-hole 41 of the copper bushing 4, and is perpendicularly connected to the elastic vibrating plate 1, realizing the stacked assembly of the elastic vibrating plate 1, the conductive connection component, and the piezoelectric component in the axial direction. The elastic ultrasonic resonator further includes two wires (a positive wire 61 and a negative wire 62), and the positive wire 61 and the negative wire 62 are respectively welded to the copper foil of the piezoelectric component and the copper conductor of the conductive connection component;

[0047] Wherein, one end of the copper conductor 5 is provided with a wire channel for the positive wire 61 to penetrate, and the positive wire 61 passes through the wire channel to communicate with an external circuit board. The positive wire 61 is welded to the edge of the first through-hole 21 (here in this embodiment, it refers to being welded to the edge of the first through-hole 21 of the copper foil 3). The other end of the copper conductor 5 is welded with a negative wire 62 that directly communicates with the external circuit board. The elastic vibrating plate 1, the conductive connection component, and the piezoelectric component are electrically connected through the positive wire 61 and the negative wire 62 (in this embodiment, the positive metal coating 22 end faces of the piezoelectric ceramic wafers 2 in the piezoelectric component are arranged oppositely, and the two end faces of the copper foil 3 are respectively electrically connected to the positive metal coatings 22 of the two piezoelectric ceramic wafers 2 through the positive wire 61 to form a positive circuit; the negative metal coatings 23 of the two piezoelectric ceramic wafers 2 are respectively electrically connected to the rib 52 on the copper conductor 5 and the frustum 42 of the copper bushing 4 through the negative wire 62 to form a negative circuit).

[0048] Embodiment 2

[0049] This embodiment provides an encapsulated ultrasonic gas meter sensor applicable to a flow channel with a Venturi tube structure, including an encapsulated rectifier 7, as Figure 7 shown. The encapsulated rectifier 7 is an integrated encapsulation structure, including a cylindrical shell 73 and a hyperbolic shell 74 arranged coaxially. A first chamber 71 (cylindrical structure) is provided inside the cylindrical shell 73, and a second chamber 72 (in this embodiment, it is a hyperbolic structure, and it can also be a cylindrical shape or other regular or irregular polygon structures) is provided inside the hyperbolic shell 74. The first chamber 71 and the second chamber 72 are communicated, and a circular truncated cone 75 is provided at the connection. A plurality of flow guide plates 91 are evenly distributed along the circumferential direction of the cylindrical shell 73, and a plurality of flow guide grooves 92 are evenly distributed along the axial direction of the hyperbolic shell 74. The flow guide plates 91 and the flow guide grooves 92 form an interconnected flow guide assembly 9 inside the encapsulated rectifier 7 for realizing the shaping and distribution of the fluid flow state.

[0050] As Figure 8 shown ( Figure 8 Figure a is a schematic structural diagram before encapsulation, Figure 8b is a schematic diagram of the planed surface structure after packaging), the inner diameter of the first cavity 71 is larger than the outer diameter of the elastic ultrasonic resonator 10 described in Example 1, and the elastic ultrasonic resonator 10 is installed in the first cavity 71 to form an ultrasonic gas meter sensor (the inner diameter of the annular table 75 described in this embodiment is smaller than the outer diameter of the elastic vibration plate 1, and the inner diameter of the first cavity 71 is larger than the outer diameter of the elastic ultrasonic resonator 10. When the elastic ultrasonic resonator 10 is packaged in the first cavity 71, the end face of the concentric groove 12 of the elastic vibration plate 1 is connected to the annular table 75); then, the first cavity 71 is filled with resin filler 8 to fix the elastic ultrasonic resonator 10, and only the positive wire 61 and the negative wire 62 are exposed.

[0051] Example 3

[0052] This embodiment provides an ultrasonic gas meter metering flow channel module, such as Figure 9 As shown, it includes a flow channel 20, and the flow channel 20 is a venturi tube structure. The inlets and outlets at both ends of the flow channel 20 are provided with ultrasonic gas meter sensors with the same structure facing each other and coaxially.

[0053] A rectifying groove 30 is provided at one inlet end of the flow channel 20. The rectifying groove 30 extends axially from the ultrasonic gas meter sensor installation area at the inlet of the ultrasonic gas meter module to the venturi tube flow measurement section and is evenly distributed along the inner wall of the flow channel.

[0054] The working principle of the ultrasonic gas meter sensor is as follows:

[0055] Two ultrasonic gas meter sensors are symmetrically arranged at the transmitting end and the receiving end of the Venturi flow channel. When the piezoelectric ceramic sheet in the ultrasonic sensor at the transmitting end receives an electrical excitation that is consistent with or close to the natural frequency of the elastic vibration plate, it drives the elastic vibration plate to vibrate at the same frequency, causing a resonance effect. The concentric grooves enhance the elasticity of the vibration plate, causing it to produce a larger amplitude axial vibration, emitting a powerful ultrasonic signal, and gathering the sound energy through the second chamber of the hyperbolic structure, and sending it to the Venturi flow channel or the circular tube flow channel in a narrow sound beam along the axis. After receiving the signal, the second chamber in the ultrasonic sensor at the receiving end transmits it to the elastic vibration plate. The elastic vibration plate will also cause a resonance effect when receiving the ultrasonic signal of the same frequency. The concentric grooves reduce the reflected sound energy, while improving the elasticity of the vibration plate, increasing the large vibration in the center of the vibration plate, linking the piezoelectric ceramic sheet to vibrate at the same frequency, and converting the mechanical energy into a stronger electrical signal.

[0056] For those skilled in the art, the present inventive concept is not limited to the details of the above-described exemplary embodiments, and the present inventive concept can be implemented in other specific forms without departing from the spirit or essential characteristics of the present inventive concept. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present inventive concept is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present inventive concept. Any reference signs in the claims should not be construed as limiting the claimed invention.

[0057] The above are only the preferred embodiments of the present inventive concept and are not intended to limit the present inventive concept. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present inventive concept shall be included within the protection scope of the technical solution of the present inventive concept.

Claims

1. An elastic ultrasonic resonator, characterized in that, It includes a piezoelectric component, an elastic vibration plate (1) located on one side of the piezoelectric component, and a conductive connection component connecting the piezoelectric component and the elastic vibration plate (1), and the elastic vibration plate (1), the conductive connection component and the piezoelectric component are stacked and assembled along the axial direction; Among them, the piezoelectric component includes at least two piezoelectric ceramic wafers (2) and a copper foil (3) located in the middle of the at least two piezoelectric ceramic wafers (2), the conductive connection component includes a copper conductor (5) and a copper bushing (4) installed at one end of the copper conductor (5), and the elastic vibration plate (1) is a stainless steel plate or a titanium alloy plate.

2. The elastic ultrasonic resonator according to claim 1, wherein, A first through hole (21) is formed in the middle of the piezoelectric component, and the piezoelectric component is sleeved on the conductive connection component through the first through hole (21); positive metal coatings (22) and negative metal coatings (23) are respectively arranged on two sides of the piezoelectric ceramic wafer (2) in the piezoelectric component.

3. The elastic ultrasonic resonator according to claim 1, wherein A positioning groove (11) is formed on one side of the elastic vibration plate (1), and a plurality of concentric circular grooves (12) with the same spacing are distributed on the other side surface; the shape of the concentric circular grooves (12) matches the shape of the elastic vibration plate (1).

4. The elastic ultrasonic resonator according to claim 2, wherein The copper bushing (4) is of a convex structure, and a second through hole (41) is provided in the center; The copper conductor (5) includes a copper tube (51) and ribs (52) provided on the outer surface of the copper tube (51), and the ribs (52) and the copper tube (51) are integrally formed; The protruding end (43) of the copper bushing (4) has a shape matching the shape of the positioning groove (11), and the conductive connection component is fitted into the positioning groove (11) of the elastic vibration plate (1) through the protruding end (43).

5. The elastic ultrasonic resonator according to claim 1, characterized in that, It further includes two wires, and the two wires are respectively welded to the copper foil (3) of the piezoelectric component and the copper conductor (5) of the conductive connection component; Among them, a wire channel is further provided on the copper conductor (5), the wire welded to the copper foil (3) passes through the wire channel to communicate with the outside, and the wire welded to the copper conductor (5) directly communicates with the outside.

6. An ultrasonic gas meter sensor based on the encapsulation of the elastic ultrasonic resonator according to any one of claims 1-5, characterized in that It further includes a packaged rectifier (7), the packaged rectifier (7) is an integrated packaging structure, including a cylindrical shell (73) and a hyperbolic shell (74) connected to one side of the cylindrical shell (73), and the cylindrical shell (73) and the hyperbolic shell (74) are coaxially arranged; A first chamber (71) is provided in the cylindrical shell (73), a second chamber (72) is provided in the hyperbolic shell (74), and the first chamber (71) and the second chamber (72) communicate with each other.

7. The ultrasonic gas meter sensor according to claim 6, wherein, The elastic ultrasonic resonator is packaged in the first chamber (71), and a resin filler (8) is further filled in the first chamber (71).

8. The ultrasonic gas meter sensor according to claim 6, characterized in that, A flow guiding component (9) is provided on the packaged rectifier (7), and the flow guiding component (9) includes a plurality of flow guiding plates (91) and a plurality of flow guiding grooves (92); The plurality of flow guiding plates (91) are arranged outside the first chamber (71) and are evenly distributed along the circumferential direction of the cylindrical housing (73); the plurality of flow guiding grooves (92) are arranged outside the second chamber (72) and are evenly distributed along the axial direction of the hyperbolic housing (74).

9. A metering module for an ultrasonic gas meter sensor according to claim 6, characterized in that, It includes a flow channel (20), the flow channel (20) is a Venturi tube structure, and ultrasonic gas meter sensors with the same structure are respectively arranged at the inlet and outlet of both ends of the flow channel (20). Among them, the directions of the two ultrasonic gas meter sensors are opposite and are arranged coaxially with the flow channel (20).

10. The metering module according to claim 9, characterized in that, A rectifying groove (30) is further arranged at one end of the flow channel (20), and the rectifying groove (30) is arranged along the circumferential direction of the inner wall of the Venturi tube.

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