An asymmetric mounting structure for an ultrasonic transducer of a flow meter

Abstract

The application discloses an asymmetric mounting structure of an ultrasonic transducer of a flowmeter and relates to the field of ultrasonic transducer mounting. One end point of a transmitting and receiving probe of a downstream ultrasonic transducer unit is arranged on a plane where an inner wall of an upper surface body is located; the other end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is located inside a cavity structure, when fluid passes through, a downstream fluid backflow is generated behind the transmitting and receiving probe, the speed distribution on an acoustic channel is not affected, and the amplitude of a signal of a receiving probe is not affected; one end point of a transmitting and receiving probe of an upstream ultrasonic transducer unit is arranged on a plane where an inner wall of a lower surface body is located; the other end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is located inside the lower surface body; when fluid flows through an end face of the transmitting and receiving probe, a weak upstream fluid backflow is generated, ultrasonic signal strength is enhanced, and the measurement precision of the flowmeter is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ultrasonic transducer installation, in particular to an asymmetric installation structure of an ultrasonic transducer of a flowmeter. BACKGROUND

[0002] As a mainstream flowmeter type at present, the ultrasonic flowmeter undertakes the heavy responsibility of flow measurement of gas and liquid, and gradually replaces the traditional turbine flowmeter, differential pressure flowmeter and electromagnetic flowmeter in the long-term development.

[0003] With the continuous development of ultrasonic flowmeter technology, the accuracy of ultrasonic measurement is continuously improved, and the strength and stability of the ultrasonic transducer signal are particularly important. The ultrasonic transducer symmetric installation method shown in the prior art has the following problems: Figure 1 The ultrasonic transducer symmetric installation method shown in the prior art has the following problems: SUMMARY

[0004] The purpose of the present application is to provide an asymmetric installation structure of an ultrasonic transducer of a flowmeter to solve the problems existing in the prior art and enhance the strength of the ultrasonic signal.

[0005] To achieve the above purpose, the present application provides the following scheme:

[0006] An asymmetric installation structure of an ultrasonic transducer of a flowmeter, the asymmetric installation structure comprising a flow passage of the flowmeter and an ultrasonic transducer unit; comprising:

[0007] The flow passage comprises an upper surface body and a lower surface body, and the upper surface body and the lower surface body form a cavity structure with two open ends; the ultrasonic transducer unit comprises an upstream ultrasonic transducer unit and a downstream ultrasonic transducer unit;

[0008] The upstream ultrasonic transducer unit is located in the through hole of the lower surface body, and one end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is on the plane where the inner wall of the lower surface body is located, and the other end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is located inside the lower surface body;

[0009] The downstream ultrasonic transducer unit is located in the through hole of the upper surface body; one end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is on the plane where the inner wall of the upper surface body is located; the other end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is located inside the cavity structure;

[0010] The distance between the upstream ultrasonic transducer unit and the inlet end of the cavity structure is less than the distance between the downstream ultrasonic transducer unit and the inlet end of the cavity structure.

[0011] Optionally, the angle between the side of the upstream ultrasonic transducer unit close to the inlet end and the inner wall of the lower body is 45 degrees to 55 degrees.

[0012] Optionally, the angle between the side of the downstream ultrasonic transducer unit away from the inlet end and the inner wall of the upper body is 45 degrees to 55 degrees.

[0013] Optionally, the first area is the area surrounded by the end face of the transmitting and receiving probe of the upstream ultrasonic transducer unit and the end face of the through hole of the lower body, and the second area is the area protruding from the inner wall of the upper body of the downstream ultrasonic transducer unit, wherein the end face of the through hole of the lower body is in the plane of the inner wall of the lower body.

[0014] Optionally, one end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is one edge point on the end face of the transmitting and receiving probe of the upstream ultrasonic transducer unit, and one end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is one edge point on the end face of the transmitting and receiving probe of the downstream ultrasonic transducer unit.

[0015] Optionally, the ultrasonic transducer unit is one or more, and the upstream ultrasonic transducer unit and the downstream ultrasonic transducer unit in each ultrasonic transducer unit are installed in a bilateral mode.

[0016] Optionally, the upstream ultrasonic transducer unit is fixed to the lower body by an external thread nut, and the downstream ultrasonic transducer unit is fixed to the upper body by an external thread nut.

[0017] Optionally, the external thread nut has two, one of which is installed at the bottom center axis of the upstream ultrasonic transducer, and the other of which is installed at the bottom center axis of the downstream ultrasonic transducer.

[0018] According to the specific embodiments of the present application, the following technical effects are provided:

[0019] The application provides an asymmetric mounting structure of an ultrasonic transducer of a flowmeter, wherein the downstream ultrasonic transducer unit is located in a through hole of the upper body; one end point of a transmitting and receiving probe of the downstream ultrasonic transducer unit is located on a plane where an inner wall of the upper body is located; the other end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is located inside the cavity structure; the end face of the downstream ultrasonic transducer just extends into the cavity structure, and when fluid passes through, a downstream fluid backflow is generated behind the end face; since the downstream fluid backflow is not on the end face of the downstream ultrasonic transducer, the velocity distribution on the sound channel is not affected, and the sound wave intensity is not attenuated, thereby affecting the amplitude of the signal of the receiving probe; the upstream ultrasonic transducer unit is located in a through hole of the lower body, and one end point of a transmitting and receiving probe of the upstream ultrasonic transducer unit is located on a plane where an inner wall of the lower body is located; the other end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is located inside the lower body; the end face of the upstream ultrasonic transducer is completely retracted into the lower body; when fluid flows through the end face of the transmitting and receiving probe of the upstream ultrasonic transducer, the velocity becomes large, the negative pressure becomes large, and the gas density becomes small, thereby generating a weak upstream fluid backflow; compared with the backflow generated when the upstream ultrasonic transducer extends deeply into the cavity structure, the upstream fluid backflow greatly weakens the amplitude attenuation of the signal of the receiving probe, enhances the ultrasonic signal intensity, and further improves the measurement accuracy of the flowmeter. BRIEF DESCRIPTION OF DRAWINGS

[0020] 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 in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0021] Figure 1 FIG. 1 is a schematic diagram of a symmetric mounting structure of an ultrasonic transducer of a flowmeter in the prior art;

[0022] Figure 2 FIG. 2 is a schematic diagram of an asymmetric mounting structure of an ultrasonic transducer of a flowmeter in an embodiment of the present application.

[0023] Explanation of symbols in the drawings:

[0024] 1, upstream ultrasonic probe, 2, downstream ultrasonic probe, 3, inlet end, 4, upper body, 5, downstream fluid flow state, 6, downstream ultrasonic transducer unit, 7, downstream fluid backflow, 8, second region, 9, upstream ultrasonic transducer unit, 10, upstream fluid backflow, 11, first region, 12, cavity structure, 13, lower body, 14, outlet end. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be apparently 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 the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0026] The purpose of the present application is to provide an asymmetric mounting structure of an ultrasonic transducer of a flowmeter to solve the problems in the prior art and enhance the ultrasonic signal strength.

[0027] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Embodiment one

[0029] Figure 2 A schematic diagram of an asymmetric mounting structure of an ultrasonic transducer of a flowmeter provided by the present application.

[0030] As Figure 2 shown, an asymmetric mounting structure of an ultrasonic transducer of a flowmeter, the asymmetric mounting structure comprising a flow passage of a flowmeter and an ultrasonic transducer unit; comprising:

[0031] The flow passage comprises an upper surface body 4 and a lower surface body 13, and the upper surface body 4 and the lower surface body 13 form a cavity structure 12 with both ends open; the ultrasonic transducer unit comprises an upstream ultrasonic transducer unit 9 and a downstream ultrasonic transducer unit 6;

[0032] The upstream ultrasonic transducer unit 9 is located in the through hole of the lower surface body 13, and one end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit 9 is on the plane where the inner wall of the lower surface body 13 is located, and the other end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit 9 is located inside the lower surface body 13, and the end face of the upstream ultrasonic transducer 9 is completely retracted into the lower surface body 13, when the fluid flows through the end face of the transmitting and receiving probe of the upstream ultrasonic transducer 9, the speed becomes larger, the negative pressure becomes larger, and the gas density becomes smaller, thereby generating a weaker upstream fluid backflow 10, which is much weaker than the backflow generated when the upstream ultrasonic transducer is deeply inserted into the cavity structure 12, and the amplitude attenuation of the received probe signal is much weaker, thereby enhancing the ultrasonic signal strength;

[0033] The downstream ultrasonic transducer unit 6 is located in the through hole of the upper surface body 4; one end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit 6 is on the plane where the inner wall of the upper surface body 4 is located; the other end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit 6 is located inside the cavity structure 12, and the end face of the downstream ultrasonic transducer 6 just extends into the cavity structure 12; at this time, the downstream fluid flow state 5 is observed, and when fluid passes, a downstream fluid backflow 7 is generated behind the fluid; since the downstream fluid backflow 7 is not on the end face of the downstream ultrasonic transducer, it will not affect the velocity distribution on the sound channel and will not attenuate the sound wave intensity, thereby affecting the amplitude of the signal received by the probe.

[0034] The distance between the upstream ultrasonic transducer unit 9 and the inlet end 3 of the cavity structure 12 is less than the distance between the downstream ultrasonic transducer unit 6 and the inlet end 3 of the cavity structure 12.

[0035] Specifically, the angle between the side of the upstream ultrasonic transducer unit 9 close to the inlet end 3 and the inner wall of the lower surface body 13 is 45 degrees to 55 degrees.

[0036] Specifically, the angle between the side of the downstream ultrasonic transducer unit 6 away from the inlet end 3 and the inner wall of the upper surface body 4 is 45 degrees to 55 degrees.

[0037] As a preferred embodiment, the first area 11 and the second area 8 of the embodiment of the present application are the same; the first area 11 is the area surrounded by the end face of the transmitting and receiving probe of the upstream ultrasonic transducer unit 9 and the end face of the through hole of the lower surface body 13; the second area 8 is the area where the downstream ultrasonic transducer unit 6 protrudes from the inner wall of the upper surface body 4; wherein the end face of the through hole of the lower surface body 13 is on the plane where the inner wall of the lower surface body 13 is located.

[0038] Specifically, one end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit 9 is an edge point on the end face of the transmitting and receiving probe of the upstream ultrasonic transducer unit 9; one end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit 6 is an edge point on the end face of the transmitting and receiving probe of the downstream ultrasonic transducer unit 6.

[0039] As a preferred embodiment, the ultrasonic transducer unit of the embodiment of the present application is one or more, and the installation mode of the upstream ultrasonic transducer unit 9 and the downstream ultrasonic transducer unit 6 in each ultrasonic transducer unit is a bidirectional installation mode. Figure 2 Only the installation diagram of one ultrasonic transducer unit.

[0040] As a preferred embodiment, the upstream ultrasonic transducer unit 9 is fixed to the lower body 13 by a threaded nut, and the downstream ultrasonic transducer unit 6 is fixed to the upper body 4 by a threaded nut.

[0041] Specifically, the threaded nut has two, one of which is installed at the bottom center axis of the upstream ultrasonic transducer unit 9, and the other is installed at the bottom center axis of the downstream ultrasonic transducer unit 6.

[0042] Further, the threaded nut includes a nut and a screw, one of which is located at the bottom center axis of the upstream ultrasonic transducer unit 9, and the other is perpendicular to the bottom center axis of the upstream ultrasonic transducer unit 9; the other nut is located at the bottom center axis of the downstream ultrasonic transducer unit 6, and the other screw is perpendicular to the bottom center axis of the downstream ultrasonic transducer unit 6.

[0043] The present application provides an asymmetric mounting method of ultrasonic transducers of a flowmeter, which can make the end face of the upstream ultrasonic transducer 9 completely retract into the lower body 13, and the end face of the downstream ultrasonic transducer 6 just extend into the pipeline 12. Wherein the end face of the downstream ultrasonic transducer 6 just extends into the pipeline 12, when fluid flows through, a downstream fluid backflow 7 is generated behind the downstream ultrasonic transducer 6, since the downstream fluid backflow 7 is not on the end face of the downstream ultrasonic transducer 6, it will not affect the velocity distribution on the sound channel and will not attenuate the sound wave intensity, thereby affecting the amplitude of the probe signal. The end face of the upstream ultrasonic transducer 9 is completely retracted into the lower body 13, when the fluid flows through the end face of the upstream ultrasonic transducer 9, the velocity becomes larger, the negative pressure becomes larger, and the gas density becomes smaller, thereby generating a weaker upstream fluid backflow 10, which is much weaker than the backflow generated when the upstream ultrasonic transducer 9 extends into the pipeline 12, thereby enhancing the ultrasonic signal intensity.

[0044] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0045] The principles and implementation manners of the present application are described by using specific examples in this paper, and the above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed. In summary, the content of the specification should not be understood as a limitation of the present application.

Claims

1. An asymmetric mounting structure for an ultrasonic transducer of a flow meter, characterized by, The asymmetric mounting structure comprises a flow passage of a flowmeter and an ultrasonic transducer unit; and comprises: The flow passage comprises an upper surface body and a lower surface body, and the upper surface body and the lower surface body form a cavity structure with two open ends; The ultrasonic transducer unit comprises an upstream ultrasonic transducer unit and a downstream ultrasonic transducer unit; the ultrasonic transducer unit is one or more, and the upstream ultrasonic transducer unit and the downstream ultrasonic transducer unit in each ultrasonic transducer unit are mounted in a back-to-back manner; The upstream ultrasonic transducer unit is located in a through hole of the lower surface body, and one end point of a transmitting and receiving probe of the upstream ultrasonic transducer unit is on a plane where an inner wall of the lower surface body is located, and the other end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is located inside the lower surface body; an end surface of the upstream ultrasonic transducer is completely retracted into the lower surface body, and a weak upstream fluid backflow is generated when fluid flows through the end surface of the transmitting and receiving probe of the upstream ultrasonic transducer; The downstream ultrasonic transducer unit is located in a through hole of the upper surface body; one end point of a transmitting and receiving probe of the downstream ultrasonic transducer unit is on a plane where an inner wall of the upper surface body is located; the other end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is located inside the cavity structure; an end surface of the downstream ultrasonic transducer is retracted into the cavity structure, and a downstream fluid backflow is generated behind the end surface of the ultrasonic transducer when fluid passes through; The distance between the upstream ultrasonic transducer unit and the inlet end of the cavity structure is less than the distance between the downstream ultrasonic transducer unit and the inlet end of the cavity structure.

2. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 1, wherein The angle between the side of the upstream ultrasonic transducer unit close to the inlet end and the inner wall of the lower surface body is 45 degrees to 55 degrees.

3. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 1, wherein The angle between the side of the downstream ultrasonic transducer unit away from the inlet end and the inner wall of the upper surface body is 45 degrees to 55 degrees.

4. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 1, wherein The first area is the same as the second area; the first area is an area surrounded by an end surface of the transmitting and receiving probe of the upstream ultrasonic transducer unit and an end surface of the through hole of the lower surface body; the second area is an area where the downstream ultrasonic transducer unit protrudes from the inner wall of the upper surface body; and the end surface of the through hole of the lower surface body is on the plane where the inner wall of the lower surface body is located.

5. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 4, wherein One end point of the transmitting and receiving probe of the upstream ultrasonic transducer unit is an edge point on the end surface of the transmitting and receiving probe of the upstream ultrasonic transducer unit; and one end point of the transmitting and receiving probe of the downstream ultrasonic transducer unit is an edge point on the end surface of the transmitting and receiving probe of the downstream ultrasonic transducer unit.

6. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 1, wherein The upstream ultrasonic transducer unit is fixed to the lower surface body by an externally threaded nut, and the downstream ultrasonic transducer unit is fixed to the upper surface body by an externally threaded nut.

7. An asymmetric mounting structure for an ultrasonic transducer of a flow meter according to claim 6, wherein There are two externally threaded nuts, one of which is installed at the bottom center axis of the upstream ultrasonic transducer unit, and the other of which is installed at the bottom center axis of the downstream ultrasonic transducer unit.

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