Ultrasonic transducer assembly and ultrasonic flow meter

Abstract

The invention provides an ultrasonic transducer assembly and an ultrasonic flowmeter, and particularly relates to the technical field of fluid flow. The ultrasonic transducer assembly comprises a barrel, a fixing piece and a transducer. The transducer comprises a transducer body and a flexible layer, the transducer body comprises an emitting surface, and the flexible layer comprises a boss. The fixing piece comprises an abutting part and a surrounding part. The barrel is provided with an inlet, an outlet, an inner cavity and a hole channel, the hole channel is used for containing at least part of the transducer and the fixing piece, the hole channel is provided with a step part, and the fixing piece is fixed to the barrel so that the enclosure part and the boss can abut against the step part. The inlet and the hole channel are located in the shell of the ultrasonic flowmeter, the inner cavity is communicated with the cavity of the shell through the inlet, the emitting face is arranged towards the inner cavity, the bottom of the fixing piece is arranged towards the cavity of the shell so that pressure at the two ends of the transducer can be balanced, and the sealing requirement for the installation position of the transducer is lowered. Excessive extrusion on the transducer body is avoided, and deformation or angle deviation caused by installation stress is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid flow, in particular to an ultrasonic transducer assembly and an ultrasonic flowmeter. BACKGROUND

[0002] An ultrasonic flowmeter is an instrument that measures fluid flow using ultrasonic technology. It determines the flow rate by measuring the time difference of ultrasonic signals propagating in the fluid. It is widely used in water treatment, petrochemical industry, natural gas and other fields.

[0003] Among them, the ultrasonic transducer is the core device of the ultrasonic flowmeter, which is generally installed as an independent assembly on the flowmeter. The transducer converts ultrasonic signals or energy into another form of signal or energy as needed. During operation, it will emit and receive the vibration caused by ultrasonic waves. In addition, sound waves can propagate in solids, liquids and gases. The transducer is connected to the flowmeter in a certain way. The vibration generated by the transducer during operation will also be transmitted to the flowmeter connected to it, and vice versa. The vibration generated by the flowmeter will also be transmitted to the transducer, which is noise. This phenomenon causes the transceiver signal of the transducer to be disturbed, the signal-to-noise ratio is poor, and the accuracy and stability of the product are affected.

[0004] Under normal circumstances, the transducer only transmits and receives sound waves generated on the transducer path, thereby avoiding the interference of other clutter and noise to its operation, to ensure the accuracy and stability of the overall performance of the product. However, in the existing ultrasonic flowmeter, the transducer must be fixed on the flowmeter shell to work normally, so that the flowmeter itself becomes a medium for transmitting sound waves, which will inevitably generate clutter and noise that interferes with the operation of the transducer. To reduce this impact, signal processing is usually used to filter out clutter and noise, that is, the electrical signal output by the transducer is processed again. In the face of complex use environment, especially in high-pressure measurement environment, this indirect processing method cannot completely eliminate this adverse effect, and makes the product hardware and software design particularly complex.

[0005] In addition, in the case of high-pressure flow measurement, the fluid pressure is high, and the transducer usually needs to be installed on the side wall of the shell and withstand a large fluid pressure. In order to ensure the sealing and prevent high-pressure fluid leakage, sufficient fastening force needs to be applied to the transducer, which will cause the transducer to be extruded, and even cause slight changes in its installation position or angle, thereby affecting the transmission and reception performance of ultrasonic waves and reducing the measurement accuracy. SUMMARY

[0006] The embodiment of the present application provides an ultrasonic transducer assembly and an ultrasonic flowmeter. The transducer is fixed to the barrel by the fixing member, and the transducer is in contact with the abutting portion and the surrounding portion of the fixing member in the fixed state. The internal cavity of the barrel is in communication with the cavity of the shell of the ultrasonic flowmeter, so that there is no pressure difference between the inside and outside of the ultrasonic transducer assembly, the fluid pressure on both sides of the transducer at the installation position is balanced, the sealing requirement of the transducer installation position is reduced, and only a small fastening force is required to realize reliable sealing. The excessive extrusion on the transducer body is effectively avoided, the deformation or angle deviation caused by the installation stress is prevented, and the measurement accuracy of the transducer is ensured.

[0007] The first aspect of the present application provides an ultrasonic transducer assembly, comprising:

[0008] The transducer comprises a transducer body and a flexible layer wrapping the transducer body, the transducer body comprises a transmitting surface, and the flexible layer comprises a boss wrapping the bottom of the transducer body;

[0009] The fixing member comprises an abutting portion for limiting the bottom of the boss and a surrounding portion for limiting the side of the boss;

[0010] The barrel has an inlet, an outlet, an internal cavity and a hole passing through the side wall of the barrel, the hole is used for accommodating at least part of the transducer and the fixing member, the hole is provided with a step portion facing away from the internal cavity, and the fixing member is fixed to the barrel so that the surrounding portion and the boss are in abutment with the step portion;

[0011] The inlet and the hole are located in the shell of the ultrasonic flowmeter, the internal cavity is in communication with the cavity of the shell through the inlet, the transmitting surface is arranged towards the internal cavity of the barrel, and the bottom of the fixing member is arranged towards the cavity of the shell so that the pressure at both ends of the transducer is balanced.

[0012] The ultrasonic transducer assembly provided by the first aspect of the embodiment of the present application comprises a barrel, a fixing member and a transducer. The transducer comprises a transducer body and a flexible layer wrapping the transducer body, the transducer body comprises a transmitting surface, and the flexible layer comprises a boss wrapping the bottom of the transducer body. The fixing member comprises an abutting portion for limiting the bottom of the boss and a surrounding portion for limiting the side of the boss. The barrel has an inlet, an outlet, an internal cavity and a hole passing through the side wall of the barrel, the hole is used for accommodating at least part of the transducer and the fixing member, the hole is provided with a step portion facing away from the internal cavity, and the fixing member is fixed to the barrel so that the surrounding portion and the boss abut against the step portion. The inlet and the hole are located in the shell of the ultrasonic flowmeter, the internal cavity is connected to the cavity of the shell through the inlet, the transmitting surface is arranged towards the internal cavity of the barrel, and the bottom of the fixing member is arranged towards the cavity of the shell so that the pressure of the two ends of the transducer is balanced. In this way, the ultrasonic transducer assembly provided by the embodiment of the present application fixes the transducer to the barrel through the fixing member, and the transducer is in contact with the abutting portion and the surrounding portion of the fixing member in the fixed state. The internal cavity of the barrel is connected to the cavity of the shell of the ultrasonic flowmeter, so that there is no pressure difference between the inside and outside of the ultrasonic transducer assembly, the fluid pressure on both sides of the transducer at the installation position is balanced, the sealing requirement of the installation position of the transducer is reduced, and only a small fastening force is required to achieve reliable sealing. The excessive extrusion of the transducer body is effectively avoided, the deformation or angle deviation caused by the installation stress is prevented, and the measurement accuracy of the transducer is ensured.

[0013] In a possible implementation, the thickness of the boss is greater than 1.01 times the distance from the outer end of the surrounding portion to the top of the abutting portion, and the thickness of the boss is less than or equal to 1.2 times the distance from the outer end of the surrounding portion to the top of the abutting portion.

[0014] In a possible implementation, the flexible layer comprises a main body portion wrapping the side of the transducer body, and the main body portion has a gap with the hole of the barrel.

[0015] In a possible implementation, the abutting portion is provided with a plurality of first protruding portions protruding towards the transducer, and the outer periphery of the first protruding portions is connected to the inner side wall of the surrounding portion.

[0016] The end surface of the boss is in contact with the first protruding portions, so that the first protruding portions limit the transducer in the axial direction.

[0017] In a possible implementation, the first protruding portions have an axial control surface at one end of the boss, the axial control surface is used to be in contact with the end surface of the boss, and the orthographic projection of the transducer body is located on the inner side of the orthographic projection of the axial control surface in the axial direction of the transducer.

[0018] In a possible implementation, along the circumferential direction of the abutting portion, the first protruding portions have a first side surface and a second side surface, and the first side surface and the second side surface are arc-shaped surfaces curved towards the surrounding portion.

[0019] In a possible implementation, the inner side wall of the enclosure is provided with a plurality of second protrusions;

[0020] The outer side wall of the second protrusion and the boss are in contact, so that the second protrusion limits the transducer in the radial direction.

[0021] In a possible implementation, the second protrusion is provided with a radial control surface on the side protruding towards the inner side wall of the enclosure;

[0022] The two ends of the radial control surface are curved and extend to the inner side wall of the enclosure, forming an arc structure.

[0023] In a possible implementation, the end of the boss away from the transducer body is provided with a plurality of transmission lines, which extend out of the barrel;

[0024] The abutting portion is provided with a first through hole for the transmission line to pass through, the radial dimension of the first through hole is less than or equal to the radial dimension of the transducer body, and the radial dimension of the first through hole is greater than or equal to half of the radial dimension of the transducer body;

[0025] The fixing member is a fixing nut, the barrel is provided with a thread, and the thread cooperates with the fixing nut, so that the fixing member can be detachably fixed in the barrel.

[0026] The second aspect of the present application provides an ultrasonic flowmeter, comprising:

[0027] A housing;

[0028] An inlet portion;

[0029] An outlet portion, the inlet portion and the outlet portion are respectively located at two ends of the housing;

[0030] And the ultrasonic transducer assembly described above, at least part of the ultrasonic transducer assembly is located inside the housing, the outlet portion is in sealing connection with the barrel of the ultrasonic transducer assembly; along the radial direction of the barrel of the ultrasonic transducer assembly, there is an annular cavity between the barrel of the ultrasonic transducer assembly and the housing, the annular cavity is in communication with the inner cavity of the barrel of the ultrasonic transducer assembly through the inlet of the barrel of the ultrasonic transducer assembly.

[0031] The ultrasonic flowmeter provided in the second aspect of the embodiments of the present application comprises a shell, an inlet part, an outlet part and the ultrasonic transducer assembly described above. The inlet part and the outlet part are respectively located at two ends of the shell. At least part of the ultrasonic transducer assembly is located inside the shell, and the outlet part is sealingly connected with the barrel of the ultrasonic transducer assembly. Along the radial direction of the barrel of the ultrasonic transducer assembly, there is an annular cavity between the barrel of the ultrasonic transducer assembly and the shell, and the annular cavity is in communication with the internal cavity of the barrel of the ultrasonic transducer assembly through the inlet of the barrel of the ultrasonic transducer assembly. In this way, the ultrasonic flowmeter provided in the embodiments of the present application has at least part of the ultrasonic transducer assembly built inside the shell, and effective vibration isolation and blocking are formed between the shell, so that indirect contact is realized between the ultrasonic transducer assembly and the shell of the flowmeter, and the influence of external noise on the transducer is reduced.

[0032] In a possible implementation, the outer side wall of the ultrasonic transducer assembly is provided with a first matching part, the inner side wall of the outlet part is provided with a second matching part, and along the axial direction of the barrel of the ultrasonic transducer assembly, the first matching part and the second matching part are provided with an elastic sealing element.

[0033] Along the axial direction of the barrel of the ultrasonic transducer assembly, the outlet of the ultrasonic transducer assembly is fixed to the outlet part through a fastener to extrude the elastic sealing element, and there is a gap between the outlet of the ultrasonic transducer assembly and the outlet part. Along the radial direction of the barrel of the ultrasonic transducer assembly, there is a gap between the outer side wall of the ultrasonic transducer assembly and the outlet part.

[0034] It should be understood that the second aspect of the present application corresponds to the technical solution of the first aspect of the present application, and the beneficial effects obtained by each aspect and the corresponding feasible implementation are similar, which will not be described again.

[0035] In addition to the technical problems solved by the present application described above, the technical features constituting the technical solutions and the beneficial effects brought by these technical features, other technical problems solved by the ultrasonic transducer assembly and the ultrasonic flowmeter provided by the present application, other technical features included in the technical solutions and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the prior art. Obviously, the drawings in the following description are only a part of the embodiments of the present application, and these drawings and the detailed description are not intended to limit the scope of the present application in any way, but are intended to explain the present application by reference to the specific embodiments. Those skilled in the art can also obtain other drawings from these drawings without any creative effort.

[0037] Figure 1 The overall structural schematic diagram of the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0038] Figure 2 The sectional schematic diagram of the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure. Figure 1

[0039] Figure 3 The structural schematic diagram of the fixing member in the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0040] Figure 4 The structural schematic diagram of the transducer in the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0041] Figure 5 The front view of the fixing member in the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0042] Figure 6 The front view of the transducer body and the fixing member cooperating with each other in the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0043] Figure 7 The front view of the cylinder in the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0044] Figure 8 The sectional schematic diagram of the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure. Figure 7

[0045] Figure 9 The partial enlarged schematic diagram of the ultrasonic transducer assembly provided by the embodiments of the present application is shown in the figure.

[0046] Figure 10 The overall structural schematic diagram of the ultrasonic flowmeter provided by the embodiments of the present application is shown in the figure.

[0047] Figure 11 The sectional schematic diagram of the ultrasonic flowmeter provided by the embodiments of the present application is shown in the figure.

[0048] Figure 12 The partial enlarged schematic diagram of the ultrasonic flowmeter provided by the embodiments of the present application is shown in the figure. ​​

[0049] Reference Signs List:

[0050] 100 - ultrasonic transducer assembly

[0051] 200 - barrel; 210 - second through hole; 220 - stepped portion; 221 - stepped surface; 230 - internal thread; 240 - inlet; 250 - outlet; 260 - internal cavity; 270 - bore; 280 - first mating portion

[0052] 300 - fixing member; 310 - first protruding portion; 311 - axial control surface; 312 - first side surface; 313 - second side surface; 320 - second protruding portion; 321 - radial control surface; 330 - abutting portion; 331 - first through hole; 340 - stop surface; 350 - external thread; 360 - enclosing portion; 361 - hollow cavity

[0053] 400 - transducer; 410 - transducer body; 411 - emitting surface; 420 - flexible layer; 421 - boss; 422 - main body portion; 430 - transmission line; 440 - stepped structure

[0054] 500 - ultrasonic flow meter

[0055] 600 - housing; 610 - plug-in portion; 611 - cable

[0056] 700 - inlet portion

[0057] 800 - outlet portion; 810 - fastener; 820 - second mating portion

[0058] 900 - elastic seal DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0060] As described in the background, generally, the transducer only emits and receives the sound waves generated on the transducer pair path, thereby avoiding the interference of other clutter and noise to its operation, to ensure the accuracy and stability of the overall performance of the product. However, in the existing ultrasonic flowmeter, since the transducer must be fixed on the flowmeter shell to work normally, the flowmeter itself becomes a medium for conducting sound waves, which will inevitably generate clutter and noise that interfere with the operation of the transducer. Generally, to reduce this influence, a signal processing method is usually used to filter out the clutter and noise, that is, the electrical signal output by the transducer is processed secondarily. In the face of complex use environment, especially in the medium and high pressure measurement environment, this indirect processing method cannot completely eliminate this adverse effect, and makes the product hardware and software design particularly complex.

[0061] In the medium and high pressure flow measurement occasion, the fluid pressure is high, and the transducer usually needs to be installed on the side wall of the shell and bear a large fluid pressure. In order to ensure the sealing, prevent the high pressure fluid from leaking, enough fastening force needs to be applied to the transducer, which will cause the transducer to be extruded, and even cause the slight change of the installation position or angle of the transducer, thereby affecting the emission and reception performance of the ultrasonic wave and reducing the measurement accuracy.

[0062] In view of the above technical problems, the embodiment of the present application provides an ultrasonic transducer assembly and an ultrasonic flowmeter. The ultrasonic transducer assembly provided by the first aspect of the embodiment of the present application comprises a barrel, a fixing member and a transducer. The transducer comprises a transducer body and a flexible layer wrapping the transducer body, the transducer body comprises a transmitting surface, and the flexible layer comprises a boss wrapping the bottom of the transducer body. The fixing member comprises an abutting portion for limiting the bottom of the boss and a surrounding portion for limiting the side of the boss. The barrel has an inlet, an outlet, an internal cavity and a hole passing through the side wall of the barrel, the hole is used for accommodating at least part of the transducer and the fixing member, the hole is provided with a step portion facing away from the internal cavity, and the fixing member is fixed with the barrel so that the surrounding portion and the boss abut against the step portion. The inlet and the hole are located in the shell of the ultrasonic flowmeter, the internal cavity of the barrel is communicated with the cavity of the shell through the inlet, the transmitting surface of the transducer is arranged towards the internal cavity of the barrel, and the bottom of the fixing member is arranged towards the cavity of the shell to balance the pressure at both ends of the transducer. In this way, the ultrasonic transducer assembly provided by the embodiment of the present application fixes the transducer on the barrel through the fixing member, and the transducer is in contact with the abutting portion and the surrounding portion of the fixing member in the fixed state. The internal cavity of the barrel is communicated with the cavity of the shell of the ultrasonic flowmeter, so that there is no pressure difference between the inside and outside of the ultrasonic transducer assembly, the fluid pressure on both sides of the transducer at the installation position is balanced, the sealing requirement of the installation position of the transducer is reduced, and the fixing member only needs to apply a small fastening force to realize reliable sealing. The excessive extrusion of the transducer body is effectively avoided, the deformation or angle deviation caused by the installation stress is prevented, and the measurement accuracy of the transducer is ensured.

[0063] The ultrasonic flowmeter provided in the second aspect of the embodiments of the present application comprises a shell, an inlet part, an outlet part and the ultrasonic transducer assembly. The inlet part and the outlet part are respectively located at two ends of the shell. At least part of the ultrasonic transducer assembly is located inside the shell, and the outlet part is in sealing connection with the barrel of the ultrasonic transducer assembly. Along the radial direction of the barrel of the ultrasonic transducer assembly, there is an annular cavity between the barrel of the ultrasonic transducer assembly and the shell, and the annular cavity is in communication with the internal cavity of the barrel of the ultrasonic transducer assembly through the inlet of the barrel of the ultrasonic transducer assembly. In this way, the ultrasonic flowmeter provided in the embodiments of the present application has at least part of the ultrasonic transducer assembly built inside the shell, and effective vibration isolation and blocking are formed between the shell, so that indirect contact is realized between the ultrasonic transducer assembly and the shell of the flowmeter, and the influence of external noise on the transducer is reduced.

[0064] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0065] The embodiments of the present application provide an ultrasonic transducer assembly and an ultrasonic flowmeter. The transducer is fixed to the barrel by the fixing member, and the transducer is in contact with the abutting part and the enclosing part of the fixing member in the fixed state. The internal cavity of the barrel is in communication with the cavity of the shell of the ultrasonic flowmeter, so that there is no pressure difference between the inside and outside of the ultrasonic transducer assembly, the fluid pressure on both sides of the transducer at the installation position is balanced, the sealing requirement for the installation position of the transducer is reduced, the fixing member only needs to exert a small fastening force to realize reliable sealing. The excessive extrusion on the transducer body is effectively avoided, the deformation or angular deviation caused by the installation stress is prevented, and the measurement accuracy of the transducer is thus ensured. The specific structure of the ultrasonic transducer assembly and the ultrasonic flowmeter provided in the embodiments of the present application will be introduced below with reference to the drawings.

[0066] Reference Figure 1 And Figure 2 In the first aspect, the embodiments of the present application provide an ultrasonic transducer assembly 100. The ultrasonic transducer assembly 100 can comprise a barrel 200, a fixing member 300 and a transducer 400. In a possible implementation manner, as shown in Figure 2As shown, the barrel 200 can be a cylindrical structure, and the fixing member 300 and the transducer 400 can also be a cylindrical structure at the end thereof facing the inside of the barrel 200, which is not limited in the embodiments of the present application. In the embodiments of the present application, the transducer 400 can be fixedly connected to the barrel 200 through the fixing member 300, and at least part of the transducer 400 can be located in the barrel 200.

[0067] With reference to Figure 3 and Figure 4 , on the basis of the above-mentioned embodiments, the fixing member 300 can include an abutting portion 330 and an enclosing portion 360. The abutting portion 330 is used to limit the bottom of the boss 421, and the enclosing portion 360 is used to limit the side of the boss 421. In the embodiments of the present application, the enclosing portion 360 can be the end of the fixing member 300 facing the inside of the barrel 200, and the enclosing portion 360 has a hollow cavity 361.

[0068] With reference to Figure 4 , on the basis of the above-mentioned embodiments, the transducer 400 can include a transducer body 410 and a flexible layer 420. The flexible layer 420 can be wrapped around the transducer body 410. Further, the transducer body 410 can include a transmitting surface 411, and the flexible layer 420 can include a boss 421. In the embodiments of the present application, the boss 421 can be used to wrap the bottom of the transducer body 410.

[0069] With reference to Figure 2 , Figure 3 and Figure 4 , the end of the transducer body 410 facing the fixing member 300 can be connected with the boss 421, and the boss 421 can be inserted into the hollow cavity 361 of the enclosing portion 360. In the embodiments of the present application, one end of the boss 421 can axially abut against the enclosing portion 360, and the other end of the boss 421 can flexibly abut against the barrel 200. In this way, the conduction path of the vibration can be reduced, the mutual interference between the transducer 400 and the fixing member 300 and the barrel 200 is effectively blocked, and the accuracy of the signal sampling is improved.

[0070] On the basis of the above-mentioned embodiments, as shown in Figure 7 , Figure 8 and Figure 11 , the barrel 200 can have an inlet 240, an outlet 250, an internal cavity 260, and a hole 270 penetrating the side wall of the barrel. The hole 270 can be used to accommodate at least part of the transducer 400 and the fixing member 300. In one possible implementation, the hole 270 can be provided with a stepped portion 220 facing away from the internal cavity 260, and the fixing member 300 is fixed to the barrel 200 so that the enclosing portion 360 and the boss 421 abut against the stepped portion 220.

[0071] Additionally, the inlet 240 and the channel 270 of the cylinder body 200 can be located in the shell 600 of the ultrasonic flowmeter 500, the inner cavity 260 of the cylinder body 200 can be connected to the cavity of the shell 600 through the inlet 240, the emitting surface 411 is arranged towards the inner cavity 260 of the cylinder body 200, and the bottom of the fixing member 300 is arranged towards the cavity of the shell 600, so that the pressure at both ends of the transducer 400 is balanced. In this way, the ultrasonic transducer assembly 100 is adapted to different pressure environments.

[0072] The ultrasonic transducer assembly 100 provided by the embodiment of the present application fixes the transducer 400 on the cylinder body 200 through the fixing member 300, and the transducer 400 is in contact with the abutting portion 330 and the surrounding portion 360 of the fixing member 300 in the fixed state. The inner cavity 260 of the cylinder body 200 is connected to the cavity of the shell 600 of the ultrasonic flowmeter 500, so that the pressure difference between the inside and outside of the ultrasonic transducer assembly 100 is eliminated, the fluid pressure on both sides of the transducer 400 at the installation position is balanced, the sealing requirement of the installation position of the transducer 400 is reduced, and only a small fastening force is required to achieve reliable sealing. The excessive extrusion of the transducer body 410 is effectively avoided, the deformation or angle deviation caused by the installation stress is prevented, and the measurement accuracy of the transducer 400 is ensured.

[0073] It can be understood that in the embodiment of the present application, the transducer 400 is changed from external pressure installation to internal pressure balance installation for medium and high pressure working conditions. Specifically, since the inner cavity 260 of the cylinder body 200 is connected to the inside of the shell 600 through the inlet 240, the fluid pressure on both sides of the transducer 400 is balanced. Therefore, the fastening force required by the fastener 810 is greatly reduced, and only a small amount of fastening is required to ensure the sealing reliability, so that the excessive extrusion of the transducer body 410 is avoided, the deformation of the emitting surface 411 or the deviation of the emitting angle caused by the installation stress is prevented, and the accuracy and stability of the transducer 400 in the medium and high pressure environment are ensured from the source of structure. At the same time, the flexible boss 421 can be matched to complete the sealing and effectively block the conduction of vibration, and the signal-to-noise ratio is improved.

[0074] On the basis of the above-mentioned embodiments, the thickness of the boss 421 can be greater than 1.01 times the distance from the outer end of the enclosing portion 360 to the top of the abutting portion 330, and the thickness of the boss 421 is less than or equal to 1.2 times the distance from the outer end of the enclosing portion 360 to the top of the abutting portion 330. In the embodiments of the present application, by designing the thickness of the boss 421, the flexible boss 421 will be subjected to a certain axial pre-compression during installation, ensuring that the boss 421 forms a tight elastic contact with the step portion 220 and the fixing member 300. In addition, the upper limit of the compression amount is controlled within 20%, avoiding excessive stress or plastic deformation of the boss 421 due to excessive compression.

[0075] With reference to the above-mentioned embodiments, Figure 4 On the basis of the above-mentioned embodiments, the flexible layer 420 can further include a main body portion 422. The main body portion 422 can be wrapped around the side of the transducer body 410, and the main body portion 422 has a gap with the hole 270 of the cylinder 200. It can be understood that by providing a gap between the main body portion 422 and the hole 270, it is ensured that there is no rigid contact between the side wall of the transducer 400 and the cylinder 200. Radial vibration or stress from the cylinder 200 or the outside cannot be transmitted to the transducer body 410 through direct contact, limiting the contact between the transducer 400 and the external structure to the area of the boss 421 at the bottom. The vibration transmission path is thus simplified and controllable.

[0076] With reference to the above-mentioned embodiments, Figure 5 On the basis of the above-mentioned embodiments, the fixing member 300 has an abutting portion 330 inside. In the circumferential direction, the abutting portion 330 can be provided with a first protruding portion 310. In one possible implementation, the number of first protruding portions 310 can be several, which is not limited in the embodiments of the present application. In the embodiments of the present application, in combination with the above-mentioned embodiments, the first protruding portion 310 is provided protruding towards the transducer 400, and the outer periphery of the first protruding portion 310 can be connected to the inner side wall of the enclosing portion 360. The several first protruding portions 310 are evenly distributed on the inner side wall of the enclosing portion 360. Figure 3

[0077] It can be understood that the first protruding portion 310 can be in contact with the end face of the boss 421, so that the first protruding portion 310 limits the transducer 400 in the axial direction. In this way, the transducer 400 is in contact with the first protruding portion 310. On the premise of ensuring reliable axial fixation, the contact area between the transducer 400 and the fixing member 300 is maximally reduced, and the vibration conduction path is reduced.

[0078] With reference to the above-mentioned embodiments, Figure 3 ​On the basis of the above-mentioned embodiments, the first protruding part 310 can have an axial control surface 311 at one end thereof towards the inside of the barrel 200, the axial control surface 311 being arranged towards the transducer 400. It can be understood that the axial control surface 311 can be used to contact the end surface of the boss 421. In this way, the first protruding part 310 is limited in the axial direction relative to the transducer 400 by the abutment of the axial control surface 311 against the end surface of the boss 421.

[0079] It can be understood that, in the process of fixing the transducer 400 to the barrel 200 by means of the fixing part 300, the axial control surface 311 is only in contact with the boss 421 in the axial direction, thereby ensuring that the fixing part 300 can not affect the performance of the transducer 400 when being screwed.

[0080] In the embodiments of the present application, as shown in Figure 6 from the fixing part 300, the point of action is outside the area in which the transducer body 410 is located in the projection. The fastening force is transmitted and dispersed by the boss 421, and is not directly applied to the transducer body 410 which is susceptible to stress. This effectively prevents the installation stress or external impact from being directly transmitted to the transducer body 410 through the fixing structure, avoids the resulting performance degradation, signal distortion or damage, and improves the stability and reliability of the transducer 400.

[0081] With reference to Figure 3 On the basis of the above-mentioned embodiments, the first protruding part 310 can have a first side surface 312 and a second side surface 313 as viewed in the circumferential direction of the abutment part 330. The first side surface 312 and the second side surface 313 can be arc-shaped surfaces curved towards the enclosing part 360. In one possible implementation, the number of first side surfaces 312 can be two, the two first side surfaces 312 being connected to the two ends of the second side surface 313, and the other end of the first side surface 312 extending to the inner side wall of the enclosing part 360. In the embodiments of the present application, it can be understood that the arc-shaped surfaces have a certain supporting effect, and the curved arrangement of the arc-shaped surfaces can avoid contact with the end surface of the boss 421, thereby reducing the contact area between the transducer 400 and the fixing part 300.

[0082] With reference to Figure 3On the basis of the above-mentioned embodiments, the inner side wall of the enclosing portion 360 can be provided with a second protruding portion 320 in the circumferential direction. In one possible implementation, the number of the second protruding portions 320 can be several, which is not limited in the embodiments of the present application. In the embodiments of the present application, the several second protruding portions 320 are uniformly distributed on the inner side wall of the enclosing portion 360, and the first protruding portion 310 and the second protruding portion 320 can be arranged in sequence with intervals.

[0083] In addition, it can be understood that the second protruding portion 320 can be in contact with the outer side wall of the boss 421, so that the second protruding portion 320 limits the transducer 400 in the radial direction. In this way, the transducer 400 is in contact with the second protruding portion 320. On the premise of ensuring reliable radial fixation, the contact area between the transducer 400 and the fixing member 300 is maximally reduced, and the vibration conduction path is reduced.

[0084] Continuing to refer to Figure 3 On the basis of the above-mentioned embodiments, the inner side wall of the enclosing portion 360 can be provided with a second protruding portion 320 in the circumferential direction. In one possible implementation, the number of the second protruding portions 320 can be several, which is not limited in the embodiments of the present application. In the embodiments of the present application, the several second protruding portions 320 are uniformly distributed on the inner side wall of the enclosing portion 360, and the first protruding portion 310 and the second protruding portion 320 can be arranged in sequence with intervals.

[0085] In addition, in one possible implementation, the two ends of the radial control surface 321 can be arranged in a curved shape and extend to the inner side wall of the enclosing portion 360, thereby forming an arc-shaped structure. It can be understood that the arc-shaped structure is located at the two ends of the radial control surface 321 and has a certain supporting effect, and the arc-shaped structure arranged in a curved shape can avoid contact with the outer side wall of the boss 421, thereby reducing the contact area between the transducer 400 and the fixing member 300.

[0086] It can be understood that the shape of the radial control surface 321 can match the boss 421, and through the control of the machining size, the radial control surface 321 can be slightly attached to the boss 421, thereby ensuring the radial positioning of the transducer 400. The second protruding portion 320 is spaced and uniformly distributed inside the fixing member 300, and the influence on the transducer 400 is minimized on the premise of ensuring reliable radial positioning.

[0087] Continuing to refer to Figure 4On the basis of the above-mentioned embodiments, in a possible implementation, the radial dimension of the boss 421 can be greater than the radial dimension of the transducer body 410. In this way, the flexible boss 421 can extend outward in the circumferential direction by a certain thickness, so that a stepped structure 440 is formed between the flexible boss 421 and the transducer body 410, thereby facilitating the abutting and fixing between the transducer 400 and the fixing member 300.

[0088] On the basis of the above-mentioned embodiments, in a possible implementation, a rubber layer can be wrapped on the outer side wall of the transducer body 410, and the flexible boss 421 can also be made of rubber material. It can be understood that the axial force acting on the flexible boss 421 will not affect the performance of the transducer 400.

[0089] With reference to the above-mentioned embodiments, Figure 3 On the basis of the above-mentioned embodiments, the end of the fixing member 300 towards the inside of the barrel 200 can have a stop face 340. In the embodiments of the present application, the axial control face 311 and the stop face 340 are at a certain distance. Exemplarily, the distance between the axial control face 311 and the stop face 340 can be accurately controlled by machining. It can be understood that by setting a reasonable distance between the axial control face 311 and the stop face 340, the axial force applied by the fixing member 300 to the transducer 400 during the tightening process can be accurately and effectively controlled.

[0090] With reference to the above-mentioned embodiments, Figure 4 On the basis of the above-mentioned embodiments, the boss 421 and the emitting face 411 can be coaxial. In addition, in the embodiments of the present application, the end of the boss 421 away from the transducer body 410 can have a plurality of transmission lines 430, and the transmission lines 430 can extend out of the barrel 200. Correspondingly, the transducer body 410 and the boss 421 can both be located in the barrel 200.

[0091] On the basis of the above-mentioned embodiments, in a possible implementation, a flexible layer 420 can be wrapped on the outer surface of the transducer body 410. Exemplarily, the flexible layer 420 can be a rubber layer, and the boss 421 can also be made of rubber material. It can be understood that the axial force acting on the boss 421 will not affect the performance of the transducer 400.

[0092] With reference to the above-mentioned embodiments, Figure 3 and Figure 5On the basis of the above-mentioned embodiments, the abutting portion 330 is provided with a first through hole 331. The first through hole 331 can be arranged at the center of the abutting portion 330, so that the abutting portion 330 is in the shape of a ring. It can be understood that the first through hole 331 is provided for the transmission line 430 to pass through, so that the transmission line 430 can extend out of the barrel 200 through the first through hole 331. In a possible implementation, the radial dimension of the first through hole 331 can be less than or equal to the radial dimension of the transducer body 410, and the radial dimension of the first through hole 331 is greater than or equal to half of the radial dimension of the transducer body 410. The size of the first through hole 331 ensures that the abutting portion 330 effectively shields and supports the transducer body 410, and the first through hole 331 also has an area sufficient for the transmission line 430 to pass through, thereby ensuring the pressure balance inside and outside the transducer 400. It can be understood that the outer periphery of the abutting portion 330 can be connected to the first protruding portion 310 and the second protruding portion 320.

[0093] With reference to the above-mentioned embodiments, Figure 2 On the basis of the above-mentioned embodiments, the barrel 200 can be provided with a second through hole 210. The second through hole 210 is provided for the transducer 400 and the fixing member 300 to pass through, so that the transducer 400 and the fixing member 300 are fixed to the barrel 200 through the second through hole 210. In this way, the transducer 400 can be first mounted and fixed to the fixing member 300, and then the transducer 400 and the fixing member 300 are screwed into the second through hole 210 of the barrel 200.

[0094] For example, the fixing member 300 can be a fixing nut, and the embodiments of the present application are not limited thereto. In the embodiments of the present application, as shown in Figure 3 The outer side wall of the fixing member 300 can be provided with an external thread 350. Correspondingly, as shown in Figure 8 The inner side wall of the barrel 200 provided with the second through hole 210 can be provided with an internal thread 230, and the internal thread 230 and the second through hole 210 are coaxial. It can be understood that the external thread 350 and the internal thread 230 are arranged opposite to each other, so that the external thread 350 and the internal thread 230 are matched, and then the fixing member 300 is detachably fixed to the barrel 200. In this way, after the external thread 350 on the fixing member 300 and the internal thread 230 on the barrel 200 are screwed, the radial positioning of the fixing member 300 can be effectively ensured, so that the coaxial reliable control of the fixing member 300 and the second through hole 210 is realized.

[0095] In addition, the second protruding portion 320 can effectively position the flexible boss 421 in the radial direction, and the flexible boss 421 and the emitting surface 411 of the transducer 400 are coaxial, so that the coaxial reliable control of the emitting surface 411 and the second through hole 210 is realized.

[0096] It can be understood that, as shown in Figure 9 the end faces of the axial control surface 311 and the boss 421 can form the same plane after the axial control surface 311 and the boss 421 abut, and the side of the boss 421 away from the axial control surface 311 can be attached to the step surface 221 of the step portion 220 of the cylinder body 200, thereby ensuring that the axial force applied by the fixing member 300 to the transducer 400 during the tightening process is not affected by the installation.

[0097] In another possible implementation, the fixing manner between the fixing member 300 and the cylinder body 200 can also be a snap spring fixing, so that the transducer 400 is fixed inside the cylinder body 200 by the snap spring, and the embodiments of the present application are not limited here. In this way, the snap spring fixing has lower cost and higher assembly efficiency.

[0098] With reference to Figure 10 and Figure 11 , the embodiments of the present application provide an ultrasonic flowmeter 500 in a second aspect. The ultrasonic flowmeter 500 can include a housing 600, an inlet portion 700, an outlet portion 800, and the ultrasonic transducer assembly 100 described above. In the embodiments of the present application, the inlet portion 700 and the outlet portion 800 can be located at two ends of the housing 600 in the flow direction of the gas. In one possible implementation, the housing 600, the inlet portion 700, and the outlet portion 800 can be a split structure. Alternatively, in another possible implementation, the housing 600, the inlet portion 700, and the outlet portion 800 can be an integrated structure.

[0099] On the basis of the above-described embodiments, at least part of the ultrasonic transducer assembly 100 can be located inside the housing 600, the cavity of the housing 600 is in communication with the internal cavity of the cylinder body 200 of the ultrasonic transducer assembly 100, and the ultrasonic transducer assembly 100 is arranged close to the outlet portion 800.

[0100] In one possible implementation, the outlet 250 of the ultrasonic transducer assembly 100 can be located inside the housing 600. Alternatively, in another possible implementation, the outlet 250 of the ultrasonic transducer assembly 100 can also extend outside the housing 600, and the embodiments of the present application are not limited here.

[0101] On the basis of the above-mentioned embodiments, the outlet part 800 can be in sealing connection with the barrel 200 of the ultrasonic transducer assembly 100. Wherein, the barrel 200 and the shell 600 can have an annular cavity in the radial direction of the barrel 200. It can be understood that the annular cavity can be in communication with the inner cavity 260 of the barrel 200 through the inlet 240 of the barrel 200. In this way, by embedding at least part of the ultrasonic transducer assembly 100 inside the shell 600 and forming effective vibration isolation and blocking between the shell 600, the indirect contact between the ultrasonic transducer assembly 100 and the shell 600 of the flowmeter is realized, and the influence of external noise on the transducer 400 is reduced.

[0102] The ultrasonic flowmeter 500 provided by the embodiments of the present application realizes the optimization of the overall structure by adopting the ultrasonic transducer assembly 100. After embedding at least part of the ultrasonic transducer assembly 100 inside the shell 600, the fluid first fills the annular cavity between the shell 600 and the barrel 200, and balances the pressure inside and outside the barrel 200 through the inlet 240. At this time, the shell 600 mainly bears the system pressure, and the embedded ultrasonic transducer assembly 100 works in a pressure-balanced environment.

[0103] Continuing to refer to Figure 11 On the basis of the above-mentioned embodiments, one end of the ultrasonic transducer assembly 100 towards the outlet part 800 can be fixedly connected with the outlet part 800 through fasteners. In addition, the inlet part 700 and the shell 600 can be fixedly connected through fasteners, and the outlet part 800 and the shell 600 can also be fixedly connected through fasteners, thereby forming the overall structure of the ultrasonic flowmeter 500. In a possible implementation manner, the fasteners can be screws, and the embodiments of the present application are not limited thereto.

[0104] On the basis of the above-mentioned embodiments, one side of the ultrasonic transducer assembly 100 inside the shell 600 and one side of the ultrasonic transducer assembly 100 towards the outlet part 800 are in communication, so that there is no pressure difference inside and outside the ultrasonic transducer assembly 100. In this way, there is also no pressure difference inside and outside the transducer 400 in the ultrasonic transducer assembly 100, and a slight axial force can realize the sealing between the transducer 400 and the barrel 200, thereby maximizing the elimination of the influence of external force on the transducer 400.

[0105] It can be understood that the communication inside and outside the ultrasonic transducer assembly 100 in the ultrasonic flowmeter 500 can make the pressure at both ends of the transducer 400 balanced, the slight pre-tightening force provided by the fixing member 300 can ensure reliable sealing and connection, greatly reducing the interference and influence of the shell 600 on the transducer 400, and the smaller pre-tightening force also reduces the extrusion on the transducer 400.

[0106] Reference Figure 12 On the basis of the above-mentioned embodiments, the outer side wall of the ultrasonic transducer assembly 100 can be provided with a first matching part 280, and correspondingly, the inner side wall of the outlet part 800 can be provided with a second matching part 820. Between the first matching part 280 and the second matching part 820, there can be an elastic sealing member 900 in the axial direction of the barrel 200.

[0107] In the axial direction of the barrel 200, the outlet 250 of the ultrasonic transducer assembly 100 can be fixed to the outlet part 800 by the fastener 810, so as to press the elastic sealing member 900, and the outlet 250 of the ultrasonic transducer assembly 100 and the outlet part 800 can have a gap therebetween. Alternatively, in the radial direction of the barrel 200, the outer side wall of the ultrasonic transducer assembly 100 and the outlet part 800 can also have a gap therebetween.

[0108] In this way, the ultrasonic transducer assembly 100 and the outlet part 800 can not be in direct contact except for the fastener therebetween, so as to form effective vibration isolation and blocking between the ultrasonic transducer assembly 100 and the outlet part 800.

[0109] Continuing to refer to Figure 11 On the basis of the above-mentioned embodiments, the ultrasonic flowmeter 500 can further include a plug-in part 610. The plug-in part 610 can be fixed to the outer side wall of the housing 600. In a possible implementation, the cable 611 of the plug-in part 610 can be located inside the housing 600 and connected to the ultrasonic transducer assembly 100. It can be understood that the plug-in part 610 can serve to connect the transducer 400 and an external data processing system.

[0110] Continuing to refer to Figure 11 and Figure 12 On the basis of the above-mentioned embodiments, the elastic sealing member 900 can be sealed between the ultrasonic transducer assembly 100 and the outlet part 800. Exemplarily, the material of the elastic sealing member 900 can be high-impedance rubber material, which is not limited in the embodiments of the present application. It can be understood that the elastic sealing member 900 is installed in the gap between the ultrasonic transducer assembly 100 and the outlet part 800, and can be used for sealing and shock absorption, so as to form a vibration blocking, reduce the path of vibration generated by the external environment to the ultrasonic transducer assembly 100 through the housing 600, and effectively reduce the influence of external interference on the measurement accuracy.

[0111] On the basis of the above-mentioned embodiments, in a possible implementation, the connection between the inlet part 700 and the housing 600, the connection between the outlet part 800 and the housing 600, and the opening of the plug-in part 610 on the outer side wall of the housing 600 can all be provided with O-rings, so as to realize the sealing of the ultrasonic flowmeter 500.

[0112] In another possible implementation, the outer side wall of the ultrasonic transducer assembly 100 and the inner side wall of the outlet portion 800 can be machined with matching internal and external threads, so that the ultrasonic transducer assembly 100 can be screwed into and fixed to the outlet portion 800 as a whole, to achieve the fixation between the ultrasonic transducer assembly 100 and the outlet portion 800. In this way, the assembly process can be reduced, and the assembly efficiency can be improved.

[0113] The embodiments or implementations in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0114] It should be noted that the terms "in specific implementation", "in some embodiments", "in the present embodiment", "exemplarily" and the like in the specification mean that the described embodiments can include the specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in combination with other embodiments which are explicitly or implicitly described.

[0115] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the specification can be used to describe any feature, structure or characteristic in the singular sense, or can be used to describe a combination of features, structures or characteristics in the plural sense. Similarly, at least partly according to the context, the terms such as "a" or "said" can be understood to convey singular usage or to convey plural usage.

[0116] It should be easily understood that "on", "above" and "over" in the present disclosure should be interpreted in the broadest way, so that "on" not only means "directly on", but also includes the meaning of "on" with intermediate features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over", but also can include the meaning of "above" or "over" without intermediate features or layers therebetween (i.e. directly on).

[0117] Moreover, spatially relative terms, such as "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0118] In closing, it is to be understood that the embodiments of the application disclosed herein are illustrative of the principles of the present application. Other modifications that can be employed are within the scope of the application. Accordingly, the scope of the application is to be construed as encompassing and the patent to be interpreted as being limited only by the claims.

Claims

1. An ultrasonic transducer assembly, characterized in that, include; A transducer includes a transducer body and a flexible layer that wraps around the transducer body. The transducer body includes a emitting surface, and the flexible layer includes a boss that wraps around the bottom of the transducer body. The fastener includes an abutting portion for limiting the bottom of the boss and a blocking portion for limiting the side of the boss; A cylindrical body having an inlet, an outlet, an internal cavity, and a channel penetrating the side wall of the cylindrical body, the channel being used to accommodate at least a portion of the transducer and the fixing member, the channel having a stepped portion facing away from the internal cavity, the fixing member being fixed to the cylindrical body so that the enclosure portion and the boss abut against the stepped portion; The inlet and channel are located inside the housing of the ultrasonic flow meter. The internal cavity is connected to the cavity of the housing through the inlet. The emitting surface is arranged facing the internal cavity of the cylinder. The bottom of the fixing member is arranged facing the cavity of the housing to balance the pressure at both ends of the transducer.

2. The ultrasonic transducer assembly according to claim 1, characterized in that, The thickness of the boss is greater than 1.01 times the distance from the outer end of the enclosure to the top of the abutment, and the thickness of the boss is less than or equal to 1.2 times the distance from the outer end of the enclosure to the top of the abutment.

3. The ultrasonic transducer assembly according to claim 1, characterized in that, The flexible layer includes a main body portion that wraps around the side of the transducer body, and there is a gap between the main body portion and the channel of the cylinder.

4. The ultrasonic transducer assembly according to claim 1, characterized in that, The abutting portion is provided with a plurality of first protrusions protruding toward the transducer, and the outer periphery of the first protrusions is connected to the inner sidewall of the enclosure portion. The first protrusion and the end face of the boss are in contact, so that the first protrusion limits the transducer in the axial direction.

5. The ultrasonic transducer assembly according to claim 4, characterized in that, The first protrusion has an axial control surface at one end facing the boss, and the axial control surface is used to contact the end face of the boss; along the axial direction of the transducer, the orthographic projection of the transducer body is located inside the orthographic projection of the axial control surface.

6. The ultrasonic transducer assembly according to claim 4, characterized in that, Along the circumference of the abutment portion, the first protrusion has a first side surface and a second side surface, the first side surface and the second side surface being arcuate surfaces that curve toward the enclosure portion.

7. The ultrasonic transducer assembly according to any one of claims 1-6, characterized in that, The inner wall of the enclosure is provided with several second protrusions; The second protrusion contacts the outer wall of the boss, so that the second protrusion limits the transducer in the radial direction.

8. The ultrasonic transducer assembly according to claim 7, characterized in that, The side of the second protrusion that protrudes toward the inner wall of the enclosure is a radial control surface, which is used to contact the outer wall of the protrusion. The two ends of the radial control surface are bent and extend to the inner wall of the enclosure to form an arc-shaped structure.

9. The ultrasonic transducer assembly according to any one of claims 1-6, characterized in that, The end of the boss facing away from the transducer body has several transmission lines, which extend out of the cylinder. The abutting portion has a first through hole through which the transmission line can pass. The radial dimension of the first through hole is less than or equal to the radial dimension of the transducer body, and the radial dimension of the first through hole is greater than or equal to half of the radial dimension of the transducer body. The fixing component is a fixing nut, and the cylinder is provided with threads. The threads cooperate with the fixing nut so that the fixing component can be detachably fixed in the cylinder.

10. An ultrasonic flow meter, characterized in that, include: case; Import Department; The outlet section, the inlet section, and the outlet section are respectively located at both ends of the housing; And the ultrasonic transducer assembly according to any one of claims 1-9, wherein at least a portion of the ultrasonic transducer assembly is located inside the housing, and the outlet is sealed to the cylindrical body of the ultrasonic transducer assembly; along the radial direction of the cylindrical body of the ultrasonic transducer assembly, there is an annular cavity between the cylindrical body of the ultrasonic transducer assembly and the housing, and the annular cavity communicates with the internal cavity of the cylindrical body of the ultrasonic transducer assembly through the inlet of the cylindrical body of the ultrasonic transducer assembly.

11. The ultrasonic flow meter according to claim 10, characterized in that, The outer side wall of the ultrasonic transducer assembly is provided with a first mating part, the inner side wall of the outlet is provided with a second mating part, and an elastic sealing element is provided between the first mating part and the second mating part along the axial direction of the cylindrical body of the ultrasonic transducer assembly. Along the axial direction of the cylindrical body of the ultrasonic transducer assembly, the outlet of the ultrasonic transducer assembly is fixed to the outlet portion by fasteners to compress the elastic seal, and there is a gap between the outlet of the ultrasonic transducer assembly and the outlet portion; along the radial direction of the cylindrical body of the ultrasonic transducer assembly, there is a gap between the outer wall of the ultrasonic transducer assembly and the outlet portion.

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