CN210664616U

CN210664616U - Anti-interference device for ultrasonic flowmeter

Info

Publication number: CN210664616U
Application number: CN201921206075.XU
Authority: CN
Inventors: 康静; 徐宗波
Original assignee: Dalian Shengshiyuan Measurement And Control Technology Co Ltd
Current assignee: Dalian Shengshiyuan Measurement And Control Technology Co Ltd
Priority date: 2019-07-29
Filing date: 2019-07-29
Publication date: 2020-06-02
Anticipated expiration: 2029-07-29

Abstract

The utility model discloses an anti jamming unit for ultrasonic flowmeter relates to ultrasonic flowmeter technical field. The utility model comprises a first shell, a second shell, an inner tube and a rectifying element; the first shell and the second shell are coaxially arranged, and the joint of the first shell and the second shell is sealed; the first shell is in a corrugated pipe shape; the cross section of the second shell is circular; the inner pipe is arranged in the first shell, and an air chamber is formed between the inner pipe and the first shell; one end of the inner pipe penetrating through the first shell is an air inlet end; the other end of the inner pipe is an air outlet end; the air outlet end extends into the second shell; air outlet holes are uniformly distributed on the periphery of the inner pipe; a baffle plate is arranged in the second shell; a gas buffer chamber is formed between the rectifying element and the baffle plate. The utility model discloses can get rid of the noise in the gas before gas gets into ultrasonic flowmeter, avoid the noise to cause the interference to ultrasonic flowmeter's measurement, improve ultrasonic flowmeter's measurement accuracy.

Description

Anti-interference device for ultrasonic flowmeter

Technical Field

The utility model belongs to the technical field of ultrasonic flowmeter, especially, relate to an anti jamming unit for ultrasonic flowmeter.

Background

With the rapid development of digital meters, particularly ultrasonic flow meter technology, a large number of ultrasonic flow meters are widely used for measuring gases such as natural gas, petroleum gas and coal gas, but in practical application, the normal metering of the ultrasonic flow meters is affected by the installation conditions of various situations and noise generated by the environment.

The gas ultrasonic flowmeter is often used together with a regulating valve, and in the process of controlling gas throttling by the valve, mechanical energy is converted into sound energy to generate high-frequency noise, and the frequency of the high-frequency noise is close to the working frequency of the gas ultrasonic flowmeter, so that the normal work of the gas ultrasonic flowmeter is seriously influenced.

At present, a plurality of methods for suppressing ultrasonic noise generally utilize a noise suppression algorithm to eliminate noise, and the method cannot suppress noise formed by a throttling component in a pipeline and directly influences the measurement of gas ultrasonic waves.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an anti jamming unit for ultrasonic flowmeter, through forming the air chamber between inner tube and the first casing, set up the gas outlet on the pipe wall of inner tube, gas gets into the air chamber through the gas outlet from the entrance point of inner tube after one step of branch gas, the noise majority in the gas is eliminated in the air chamber, further eliminated when gas gets into first indoor subsequently, gas is steady gradually in the cushion chamber, again through rectifier element's rectification, make the gas velocity of flow of combustion gas even in the second casing, it is stable, make ultrasonic flowmeter's measurement accuracy high, the error is little, it usually utilizes the noise suppression algorithm to eliminate noise to have solved present, this kind of method can't restrain because of the noise that throttling component formed in to the pipeline, the problem of the measurement of direct influence gaseous ultrasonic wave.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to an anti-interference device for an ultrasonic flowmeter, which comprises a first shell, a second shell, an inner tube and a rectifier element;

the first shell and the second shell are coaxially arranged, and the joint of the first shell and the second shell is sealed; the first shell is in a corrugated pipe shape; the cross section of the second shell is circular;

the inner pipe is arranged in the first shell, and an air chamber is formed between the inner pipe and the first shell; one end of the inner pipe penetrating through the first shell is an air inlet end; the other end of the inner pipe is an air outlet end; the air outlet end extends into the second shell; air outlet holes are uniformly distributed on the periphery of the inner tube; a baffle plate is arranged in the second shell; the baffle divides the second housing into a first chamber and a second chamber; the air outlet end of the inner pipe is positioned in the first chamber; the baffle is uniformly provided with a plurality of exhaust holes along the axial direction of the inner pipe;

the rectifying element is arranged at one end of the second shell, which is far away from the first shell; and a gas buffer chamber is formed between the rectifying element and the baffle plate.

Furthermore, a plurality of partition plates are arranged between the inner pipe and the first shell; the partition plate divides the gas chamber into chambers of different sizes.

Further, the diameter of the air outlet hole of the inner tube in the first shell is larger than that of the air outlet hole of the inner tube in the first chamber.

Furthermore, the air outlet end of the inner pipe is fixedly connected with the baffle.

Further, the rectifying element is cylindrical; the rectifying element is provided with a plurality of axial through holes.

The utility model discloses following beneficial effect has:

1. the utility model discloses can get rid of the noise in the gas before gas gets into ultrasonic flowmeter, avoid the noise to cause the interference to ultrasonic flowmeter's measurement, improve ultrasonic flowmeter's measurement accuracy.

2. The utility model discloses a design into bellows shape with first casing to be equipped with a plurality of baffles between inner tube and first casing, cut apart into the not cavity of equidimension with the air chamber through the baffle, can get rid of better the noise in the gas that gets into the air chamber.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an anti-interference device for an ultrasonic flow meter according to the present invention;

FIG. 2 is a front view of a rectifying element;

in the drawings, the components represented by the respective reference numerals are listed below:

1-a first shell, 2-a second shell, 3-an inner pipe, 4-a rectifying element, 5-an air inlet end, 301-an air outlet hole, 6-a baffle, 201-a first chamber, 601-an air outlet hole, 7-an air buffer chamber, 8-a partition plate, 9-a cavity and 401-a through hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "inner", "one end", "the other end", "peripheral side", etc. indicate positional or orientational relationships and are merely for convenience of description and simplicity of description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Referring to fig. 1, the utility model relates to an anti-interference device for an ultrasonic flowmeter, which comprises a first shell 1, a second shell 2, an inner tube 3 and a rectifying element 4;

the first shell 1 and the second shell 2 are coaxially arranged, and the joint of the first shell 1 and the second shell 2 is sealed; the first shell 1 is in a bellows shape; the cross section of the second shell 2 is circular; in specific implementation, the first housing 1 and the second housing 2 can be fixedly connected in a sealing manner by welding.

The inner pipe 3 is arranged in the first shell 1, the inner pipe 3 and the first shell 1 are coaxially arranged, and an air chamber is formed between the inner pipe 3 and the first shell 1; one end of the inner pipe 3 penetrates through the first shell 1, and one end of the inner pipe 3 penetrating through the first shell 1 is an air inlet end 5; the other end of the inner tube 3 is an air outlet end; the air outlet end extends into the second shell 2; air outlet holes 301 are uniformly distributed on the periphery of the inner tube 3; a baffle 6 is arranged in the second shell 2, and the baffle 6 is vertical to the axis of the second shell 2; the baffle 6 divides the second housing 2 into a first chamber 201 and a second chamber; the air outlet end of the inner pipe 3 is positioned in the first chamber 201, and the air outlet end of the inner pipe 3 is fixedly connected with the baffle 6; the baffle 6 is uniformly provided with a plurality of exhaust holes 601 along the axial direction of the inner pipe 3;

the rectifier element 4 is arranged at one end of the second shell 2 far away from the first shell 1; a gas buffer chamber 7 is formed between the rectifying element 4 and the baffle 6, and specifically, the rectifying element 4 is cylindrical; the rectifier element 4 is tightly connected with the second shell 2; the rectifying element 4 is provided with a plurality of axial through holes 401, as shown in fig. 2.

The specific working process is described as follows: the anti-interference device can be arranged at the upstream of the gas ultrasonic flowmeter, can be arranged close to the gas ultrasonic flowmeter and can also be separated by a certain distance (the distance can be determined according to the size of a field space), mechanical energy of gas coming from the upstream of the anti-interference device is converted into sound energy in the throttling process to generate noise, the noise enters the inner tube 3 along with the gas, the sound energy is partially reflected and expanded due to the existence of the radial gas outlet holes 301, the noise in middle and high frequency sections is mainly eliminated, the gas enters the gas chamber under the action of the gas outlet holes 301, noise sound waves in different frequency sections are continuously reflected on the inner wall of the expansion chamber I, the noise sound waves in the same frequency section are mutually counteracted, and the noise in low and middle frequency sections is mainly eliminated; then the gas enters the first chamber 201, mainly eliminating the noise of low and medium frequency band; then the gas enters the buffer chamber 7 to be gradually stabilized, and then the flow velocity of the gas discharged from the second shell 2 is uniform and stable through rectification of the rectifying element 4, so that the measurement precision of the ultrasonic flowmeter is high and the error is small.

Wherein, a plurality of clapboards 8 are arranged between the inner pipe 3 and the first shell 1; the partition 8 divides the chamber into chambers 9 of different sizes. Therefore, the design can remove the noise with different frequencies in the gas, the noise reduction capability is improved, and the noise interference is reduced.

Wherein the diameter of the air outlet hole 301 of the inner tube 3 in the first housing 1 is larger than the diameter of the air outlet hole 301 of the inner tube 3 in the first chamber 201. The design can improve the capability of removing noise in the gas.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-interference device for an ultrasonic flowmeter is characterized by comprising a first shell (1), a second shell (2), an inner pipe (3) and a rectifying element (4);

the first shell (1) and the second shell (2) are coaxially arranged, and the joint of the first shell (1) and the second shell (2) is sealed; the first shell (1) is in a corrugated pipe shape; the cross section of the second shell (2) is circular;

the inner pipe (3) is arranged in the first shell (1), and an air chamber is formed between the inner pipe (3) and the first shell (1); one end of the inner pipe (3) penetrating through the first shell (1) is an air inlet end (5); the other end of the inner pipe (3) is an air outlet end; the air outlet end extends into the second shell (2); air outlet holes (301) are uniformly distributed on the periphery of the inner tube (3); a baffle (6) is arranged in the second shell (2); the baffle (6) dividing the second housing (2) into a first chamber (201) and a second chamber; the air outlet end of the inner pipe (3) is positioned in the first chamber (201); the baffle (6) is uniformly provided with a plurality of exhaust holes (601) along the axial direction of the inner pipe (3);

the rectifying element (4) is arranged at one end of the second shell (2) far away from the first shell (1); and a gas buffer chamber (7) is formed between the rectifying element (4) and the baffle plate (6).

2. The interference rejection device for an ultrasonic flow meter according to claim 1, wherein a plurality of partition plates (8) are provided between said inner tube (3) and said first casing (1); the partition (8) divides the air chamber into chambers (9) of different sizes.

3. The interference rejection device for an ultrasonic flow meter according to claim 1, wherein the diameter of the air outlet hole (301) of said inner tube (3) in said first housing (1) is larger than the diameter of the air outlet hole (301) of said inner tube (3) in said first chamber (201).

4. The anti-interference device for the ultrasonic flowmeter according to claim 1, wherein the air outlet end of the inner pipe (3) is fixedly connected with the baffle plate (6).

5. The interference rejection device for an ultrasonic flow meter according to claim 1, wherein said rectifying element (4) is cylindrical; the rectifying element (4) is provided with a plurality of axial through holes (401).