CN211042354U

CN211042354U - Ultrasonic gas meter flow channel structure

Info

Publication number: CN211042354U
Application number: CN201922445396.1U
Authority: CN
Inventors: 石爱国; 张金龙; 张天才
Original assignee: Hangzhou Innover Technology Co ltd
Current assignee: Hangzhou Innover Technology Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-07-17
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to an ultrasonic wave gas table runner structure. The flow regulating device is characterized in that a plurality of guide grooves which are symmetrically arranged are formed in the upper wall of the square flow channel and the bottom plate along the gas flowing direction, a plurality of rectifier plates are inserted into the square flow channel from the tail part of the square flow channel along the corresponding guide grooves in the upper wall and the bottom plate, and the square flow channel is divided into a plurality of flow paths with the same size; the upper side and the lower side of the fairing are provided with steps which are gradually increased along the gas flowing direction, and the guide grooves on the upper wall and the bottom plate are respectively provided with step grooves which are gradually decreased and matched with the steps which are gradually increased along the gas flowing direction. The utility model discloses a square runner adopts the global design, and the number of segments and the step height in step groove are the same and the symmetry on upper wall and the bottom plate, are convenient for insert the inseparable centre gripping of each section step in back together, and not only the installation location is convenient, and the straightness height of hanging down is just not hard up in the installation of multilayer thin slice commutator simultaneously, has also reduced the decay of received signal range by a wide margin when reaching the best with the rectification effect.

Description

Ultrasonic gas meter flow channel structure

Technical Field

The utility model relates to an ultrasonic wave gas table runner structure.

Background

In the traditional ultrasonic gas meter, a rectangular sheet type rectifier is mostly adopted in the structural design of a flow passage, and the square flow passage is divided into a plurality of layers of flat flow passages; for the convenience of installation and positioning, the shape of the commutator segment generally adopts a plurality of projections with two side end parts projecting upwards and a plurality of projections with lower end parts projecting downwards, and the insertion runner bottom plate part is provided with a groove part for inserting the projections on the two side ends of the commutator segment; because the installation mode requires high dimensional accuracy, is not easy to install and position, has poor process consistency and low production efficiency, and can not ensure the inserted verticality of the commutator segments, the verticality can reflect the sound waves of the ultrasonic sensor, the amplitude of the received signals is greatly attenuated, and the stability of measurement is also poor.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model aims to provide a technical scheme of ultrasonic wave gas table runner structure.

The flow channel structure of the ultrasonic gas meter comprises a square flow channel and is characterized in that a plurality of guide grooves which are symmetrically arranged are formed in the upper wall and the bottom plate of the square flow channel along the gas flowing direction, a plurality of rectifier plates are inserted into the square flow channel from the tail part of the square flow channel along the corresponding guide grooves in the upper wall and the bottom plate, and the square flow channel is divided into a plurality of flow channels with the same size; the upper side and the lower side of the fairing are provided with steps which are gradually increased along the gas flowing direction, and the guide grooves on the upper wall and the bottom plate are respectively provided with step grooves which are gradually decreased and matched with the steps which are gradually increased along the gas flowing direction.

The ultrasonic gas meter flow channel structure is characterized in that the inlet end of the guide groove is of a step structure retracted from outside to inside, the opening of the guide groove at the first order at the tail part of the square flow channel is larger than the opening of the guide groove at the first order at the inner side, the opening section of the last-stage guide groove close to the head part of the square flow channel is a horn mouth, and the distance between the minimum positions of the horn mouths is matched with the thickness of the commutator segments.

The ultrasonic gas meter flow channel structure is characterized in that the upper corner and the lower corner of the head of the rectifier cell are both provided with arc chamfers.

The ultrasonic gas meter flow channel structure is characterized in that the cross section of the square flow channel is rectangular, and the distance between the upper wall and the bottom plate of the square flow channel is greater than the distance between the two side walls of the square flow channel.

The ultrasonic gas meter utilizing the flow channel structure is characterized in that two pairs of ultrasonic sensors are arranged at the positions of the vertical symmetrical center lines of the upper arm and the bottom plate of the square flow channel, and a plane formed by connecting the two pairs of ultrasonic sensors is horizontally arranged.

The ultrasonic gas meter is characterized in that a metering circuit board is horizontally arranged on the outer side of a bottom plate of the square flow channel.

The utility model discloses well measurement area's square runner adopts the global design, both sides set up the step that rises step by step along the gas flow direction about the commutator, the guide way on upper wall and the bottom plate all sets to the step groove that reduces step by step with the step assorted that the commutator rised step by step along the gas flow direction, the segment number in step groove and step height the same and symmetry on upper wall and the bottom plate, be convenient for insert the inseparable centre gripping of back each segment step together, not only installation convenient location, multilayer thin-sheet commutator installation straightness height of hanging down just does not have not hard up simultaneously, the decay that has also reduced the received signal range by a wide margin when reaching the best with the rectification effect, the measurement stability is provided.

Drawings

Fig. 1 is a sectional view of the ultrasonic gas meter of the present invention;

FIG. 2 is an exploded view of the flow metering module of the present invention;

FIG. 3 is a side view of the flow metering module of the present invention;

Fig. 4 is a cross-sectional view of the flow metering module of the present invention;

FIG. 5 is an enlarged view of portion A of FIG. 4;

FIG. 6 is a cross-sectional view of a square flow channel;

FIG. 7 is a schematic view of a rectifier;

Fig. 8 is an enlarged view of the guide groove.

Detailed Description

The invention will be further explained with reference to the drawings in the following description:

For clear explanation the utility model discloses a structure, the utility model discloses introduce the structure of ultrasonic wave gas table earlier to be convenient for understand the utility model discloses the creativity of runner structure.

The utility model relates to an ultrasonic wave gas table includes the table body 21, sets up the gas outlet 23, control flap 24, the flow measurement module 30 of the air inlet 22 of ultrasonic wave gas table, ultrasonic wave gas table on the table body 21, and flow measurement module 30 connects return bend 25, and return bend 25 is equipped with installation department 25a, and the installation department 25a of return bend 25 inserts the 30 afterbody of flow measurement module and makes its structure even as an organic whole. A control valve 24 is arranged in the ultrasonic gas meter 21, when a user uses gas normally, the valve is in a valve opening state, and the gas flows into the ultrasonic gas meter through the control valve 24; when abnormal conditions such as gas leakage and arrearage occur, the control valve 24 is immediately closed, so that gas is blocked from entering the shell of the ultrasonic gas meter. The inlet of the control valve 24 is provided with a first sealing ring 26c and a buckle mounting structure which are connected with the air inlet 22 of the ultrasonic gas meter into a whole structurally. The main purpose of the sealing ring 26c is to ensure that all the gas flowing through the inlet 22 of the ultrasonic gas meter flows out into the cavity 27 of the ultrasonic gas meter via the control valve 24.

the method comprises the steps that an external disordered gas flow entering from a gas inlet of a gas meter is buffered through an inner cavity of the gas meter and then enters a flow metering module 30, a multi-stage rectification is formed by a honeycomb rectification network 11, a Venturi rectifier 12 and a square front straight pipe 13 at the inlet end of the flow metering module 30, the gas flow is adjusted to be in a laminar state through a plurality of rectification pieces 38 and then enters a testing area of ultrasonic sensor groups (34 a-34 d), a metering circuit board is horizontally arranged outside a bottom plate of a square flow channel, when a gas medium 28 flows in the pipeline, the metering circuit board in a circuit board sealing box 32 utilizes the measured propagation time difference △ T between main ultrasonic sensor groups (34 a and 34 b) and standby ultrasonic sensor groups (34 c and 34 d) to be in direct proportion to the flow rate of the gas medium in the pipeline, the flow metering module 37 and a gas outlet 25 are connected and sealed through a second sealing ring 26a, the other end of the gas outlet 25 and an ultrasonic gas outlet 23 are connected and sealed through a third sealing ring 26b, and the gas meter is used for ensuring the sealing performance of the gas meter after the gas meter 30 enters the ultrasonic gas meter and flows out of the gas meter through the ultrasonic meter.

The flow measurement module 30 is provided with the fixed bolster 33 on both sides respectively, is equipped with 2 mounting holes on the fixed bolster 33, and the accessible is 2 fixed screws with flow measurement module 30 on the table body. The ultrasonic gas meter comprises a flow metering module 30 and an ultrasonic gas meter body 21, wherein the flow metering module 30 is fixed to the ultrasonic gas meter body 21 to form a whole, and the flow metering module 30 is prevented from shaking in a shell to influence the metering performance.

The utility model discloses flow measurement module 30 mainly comprises rectifier, square runner, ultrasonic sensor and the measurement circuit board of entry end. The square flow passage is composed of side walls (36 a, 36 b) along the flowing direction of the gas to be measured, an upper wall 36c and a bottom plate 36d arranged correspondingly. The multilayer fairing 38 is inserted into the square flow channel from the tail 37 of the flow metering module to divide the flow channel into a plurality of small flow channels which are identical and flat. 4

ultrasonic sensors

34a, 34b, 34c and 34d are respectively arranged on the upper wall 36c of the square flow channel and the bottom plate 36d which is correspondingly arranged, and are respectively installed and fixed in the

installation holes

31a, 31b, 31c and 31d through

installation press caps

35a, 35b, 35c and 35d with locking and buckling functions.

the ultrasonic flow meter comprises an upper wall 36c and a bottom plate 36d,

ultrasonic sensors

34a and 34b are fixedly installed in a coaxial correlation mode at the same angle through installation holes with preset angles in a flow channel structure to form an independent ultrasonic sensor group which receives and transmits mutually, a plane formed by connecting lines of the two pairs of ultrasonic sensors is horizontally arranged, the correlation installation mode can enable the ultrasonic receiving and transmitting sensors 34a to transmit ultrasonic waves to directly and horizontally penetrate through a plurality of layers of rectifying pieces 38 and then reach an opposite ultrasonic sensor 34b to receive ultrasonic signals, the problem that the traditional reflection installation mode causes signal attenuation due to unevenness of a reflecting surface is avoided, optimal receiving sensitivity can be obtained, and the stability of the metering performance is guaranteed, a corrosion-resistant rubber gasket is arranged on the installation surfaces of the ultrasonic sensors and the installation holes 31, the rubber gasket has a connection function of 1, can play a sealing function to prevent gas media flowing through a main flow metering module 30 from leaking from the installation holes 31 to affect the measuring accuracy, 2, can be used as an effective damping carrier, the ultrasonic sensors can vibrate after transmitting signals to quickly stop to avoid affecting the signal receiving of the signals after the signals, can also reduce the signal noise quickly and reduce the signal-to-noise, the signal-to-noise ratio, ensure that the gas metering unit △ the two pairs of ultrasonic sensors is generated by the main flow metering main metering modules, the two pairs of the ultrasonic sensors, the two pairs of the ultrasonic sensor group, the two pairs of ultrasonic sensors can be designed to be simultaneously, the ultrasonic sensor group, the two pairs of the ultrasonic sensor group, the two pairs of ultrasonic sensor group can be designed and the ultrasonic sensor group, the two pairs of the ultrasonic sensor group can be used for the metering units, the metering units can be designed to be capable of the metering units, and the metering units, the metering units can be simultaneously.

The front end of the square flow channel is provided with a square front straight pipe, the front end of the square front straight pipe is provided with a Venturi rectifier in a matching way, the front end of the Venturi rectifier is provided with a honeycomb rectifier 11 in a matching way, and a gas medium enters the square flow channel through the honeycomb rectifier 11, the Venturi rectifier 12 and the square front straight pipe 13; the turbulent gas medium 28 at the inlet end can enter the measurement area of the ultrasonic sensor after being rectified by the front stage, so that the airflow of the measurement area is stable, the small flow stability is improved, the integral measurement is improved quarterly, and the pressure loss generated by the gas medium is extremely small due to the large flow sectional area of the honeycomb rectifier.

The following description is made of the guide groove 39 for inserting the rectifying plate 38 into the square flow passage:

A plurality of guide grooves 39 are uniformly distributed on the bottom plate 36d of the square flow passage, the groove is formed from the tail part 37 of the flow metering module to the head part in the groove forming direction, step grooves 39a which are gradually lowered are formed in the same position of each guide groove 39, corresponding rectifying pieces 38 are provided with steps 38a which are gradually raised corresponding to the corresponding rectifying pieces, and the rectifying pieces are mutually abutted and fixed for limiting after being inserted into the guide grooves.

The inlet end of the guide groove 39 is in an outward-inward retraction manner, that is, the inlet end has a circumference surrounded by the first outer edge 39h, the second outer edge 39i and the third outer edge 39j, which is larger than the circumference surrounded by the first inner edge 39d, the second inner edge 39e, the third inner edge 39f and the fourth inner edge 39g, and is not on the same plane. The purpose of this design is to facilitate easy insertion of the fairing. Because the guiding gutter is extended to the entrance stroke very long by measurement module afterbody 37, demolding when moulding plastics conveniently, avoids the guiding gutter bottom too much burr to influence the insertion of fairing, so the first interior limit 39d of guiding gutter upper half, the interior limit 39e adoption of second are two angle of inclination openings, promptly, guiding gutter upper portion 39k is greater than the width of end 39c and fairing 38, the purpose of design like this both is convenient for the very easy insertion of fairing. The guiding gutter latter half is by two vertical guiding gutter third interior limit 39f and the fourth interior limit 39g and end 39c constitute, and its width equals the width of fairing 38, inserts the back gradually and closely laminates with guiding gutter latter half inner wall and plays fine fixed, prevents to rock because of fairing 38 when gas flow is too big and leads to the measurement unstable.

Because the guide groove extends to the entrance from the tail part 37 of the metering module for a long stroke, the friction force of the commutator 38 gradually inserted from the guide groove 39 of the tail part 37 of the ultrasonic metering module is continuously enhanced, the insertion is very difficult during installation, the production efficiency is low, and meanwhile, the commutator 38 is easily bent due to too large force to influence the rectification effect of a gas flow field. In order to solve the problem, the present invention provides a commutator segment 38 and a guide groove 39

A plurality of sections of micro steps are adopted to reduce the inserted friction force.

The commutator 38 forms a plurality of steps 38a which are symmetrical up and down and are gradually increased, a guide groove 39a which is used for inserting the commutator into the steps which are gradually decreased along the gas flowing direction is arranged in the upper wall 36c of the ultrasonic metering module and the guide groove bottom 39c of the corresponding bottom plate 36d, the number of the steps on the upper wall and the bottom plate is the same as the height of the steps, and the steps are symmetrical, so that the steps are tightly clamped together after being inserted. In this embodiment, three steps are selected, so that the contact area between the commutator segments 38 and the bottom 39c of the guide groove is reduced by 3 times, and the friction force during insertion is correspondingly reduced by 3 times. The inlet angle of the fillet 38 is the narrowest end of the multi-section fillet 38, and the head part adopts a chamfer design, so that the insertion is prevented from encountering a step stop facing the inside of the guide groove bottom 39c during the insertion and the insertion is convenient.

the inlet of the guiding groove 39 has an inclined surface for inserting the rectifying plate 38 into the flow passage structure gradually reducing from outside to inside, meanwhile, the upper part 39k of the guiding groove is larger than the bottom 39c of the guiding groove and has a first inner edge 39d and a second inner edge 39e which are inclined and have a wide upper part and a narrow lower part, when the rectifying plate 38 is inserted from the tail part 37 of the flow passage structure, the rectifying plate 38 is easily pushed into the guiding groove 39 because the inlet of the guiding groove 39 has the inclined surface gradually reducing, when the rectifying plate 38 is continuously pushed into the guiding groove 39 because of the first inner edge 39d and the second inner edge 39e of the inner wall of the guiding groove gradually advancing, because the front end part of the rectifying plate is provided with an arc chamfer 38c, the first-stage rectifying plate width d1 is equal to the first guiding groove width L3, and is smaller than the second guiding groove width L2 and the second guiding groove width L2, the friction force of the rectifying plate 38 is greatly reduced after the rectifying plate 38 contacts with the guiding groove 39, so that the rectifying plate 38 is easily inserted into the flow passage structure, the set position, namely, when the rectifying plate 38 is inserted into the flow passage structure, the rectifying plate 38 is gradually inserted into the flow passage structure, the rectifying plate 38 is prevented from being inserted into the flow passage structure, the flow passage structure is prevented from being gradually advancing, the flow passage structure of the flow passage structure, the flow passage structure is prevented from being gradually advancing, the flow passage structure of the flow passage structure.

The utility model discloses a runner structural design not only is applicable to supersound gas metering instrument, also is applicable to the warm type gas flow instrument of mems.

Claims

1. A flow channel structure of an ultrasonic gas meter comprises a square flow channel and is characterized in that a plurality of guide grooves which are symmetrically arranged are formed in the upper wall of the square flow channel and the bottom plate along the gas flowing direction, a plurality of rectifier plates are inserted into the square flow channel from the tail part of the square flow channel along the corresponding guide grooves in the upper wall and the bottom plate, and the square flow channel is divided into a plurality of flow channels with the same size; the upper side and the lower side of the fairing are provided with steps which are gradually increased along the gas flowing direction, and the guide grooves on the upper wall and the bottom plate are respectively provided with step grooves which are gradually decreased and matched with the steps which are gradually increased along the gas flowing direction.

2. The flow passage structure of an ultrasonic gas meter according to claim 1, wherein the inlet end of the guide groove is in a step structure that is recessed from outside to inside, the opening of the guide groove at the first step at the tail of the square flow passage is larger than the opening of the guide groove at the first step at the inside, the opening section of the last guide groove near the head of the square flow passage is in a bell mouth, and the minimum distance between the bell mouths is matched with the thickness of the commutator segments.

3. The flow channel structure of the ultrasonic gas meter according to claim 1 or 2, wherein upper and lower corners of the head of the commutator segment are provided with arc chamfers.

4. The flow channel structure of the ultrasonic gas meter according to claim 1, wherein the cross section of the square flow channel is rectangular, and a distance between an upper wall and a bottom plate of the square flow channel is greater than a distance between two side walls of the square flow channel.

5. An ultrasonic gas meter using the flow channel structure of claim 1, wherein two pairs of ultrasonic sensors are arranged at the positions of the upper and lower symmetrical center lines of the upper and lower plates of the square flow channel, and the plane formed by connecting the two pairs of ultrasonic sensors is arranged horizontally.

6. The ultrasonic gas meter according to claim 5, wherein a metering circuit board is horizontally disposed outside the bottom plate of the square flow channel.