阅读说明：本技术 一种高精度的超声波计量通道 (High-precision ultrasonic metering channel ) 是由 王增 汪志远 厉恺杰 魏佳敏 付东月 于 2021-09-29 设计创作，主要内容包括：本发明公开了一种高精度的超声波计量通道,包括计量通道壳体、分隔薄片、挡片、通道支架、计量模块和通道盖；分隔薄片设置在计量通道壳体内,挡片设置在计量通道壳体上方开口处；通道盖连接计量通道壳体,与计量通道壳体上方开口相配合,通道支架和计量模块设置在通道盖与计量通道壳体形成的空腔内；通道支架为轴对称结构,连接计量通道壳体,与挡片位置相对应；计量模块共有两个,在分别设置在通道支架对称轴的左右两侧。本发明在其中一个计量模块发生损坏的情况下,可由另一个正常运行的计量模块单独计量,大大减少了商用燃气表因计量通道故障而对制造商、燃气公司、燃气使用者所造成的损失。(The invention discloses a high-precision ultrasonic metering channel which comprises a metering channel shell, a separation sheet, a separation blade, a channel bracket, a metering module and a channel cover, wherein the metering channel shell is provided with a plurality of through holes; the separation sheet is arranged in the metering channel shell, and the baffle sheet is arranged at an opening above the metering channel shell; the channel cover is connected with the metering channel shell and matched with an opening above the metering channel shell, and the channel support and the metering module are arranged in a cavity formed by the channel cover and the metering channel shell; the channel bracket is in an axisymmetric structure, is connected with the metering channel shell and corresponds to the position of the baffle; the number of the metering modules is two, and the metering modules are respectively arranged at the left side and the right side of the symmetrical axis of the channel bracket. When one metering module is damaged, the other metering module which normally operates can independently meter, so that the loss of a commercial gas meter to manufacturers, gas companies and gas users due to the failure of a metering channel is greatly reduced.)

1. A high-precision ultrasonic metering channel is characterized by comprising a metering channel shell, a separation sheet, a baffle, a channel bracket, a metering module and a channel cover;

the separation sheet is arranged in the metering channel shell, and the blocking piece is arranged at an opening above the metering channel shell; the channel cover is connected with the metering channel shell and matched with an opening above the metering channel shell, and the channel bracket and the metering module are arranged in a cavity formed by the channel cover and the metering channel shell; the channel bracket is of an axisymmetric structure, is connected with the metering channel shell and corresponds to the position of the baffle; the two metering modules are respectively arranged at the left side and the right side of the symmetrical axis of the channel bracket.

2. The high-precision ultrasonic metering channel as claimed in claim 1, wherein clamping grooves with equal intervals are formed in the metering channel shell and used for installing the separating sheets, and grooves are formed in an opening above the metering channel shell.

3. The high-precision ultrasonic metering channel as claimed in claim 2, wherein the separating sheets are inserted into clamping grooves which are uniformly arranged in the metering channel shell at equal intervals, and the clamping grooves and the separating sheets are in interference fit.

4. The high-precision ultrasonic metering channel as claimed in claim 3, wherein the baffle plate is flatly placed at a groove above the metering channel shell and used for sealing an opening above the metering channel shell so as to ensure that gas cannot escape back to a gas meter after passing through the metering area and cannot enter the channel from the rear of the metering area to be subjected to metering leakage; the separation blade is opened there are 4 through-holes, and the through-hole is located metering module ultrasonic transducer below for metering module acoustic beam passes.

5. The high-precision ultrasonic metering channel as claimed in claim 4, wherein the channel cover is used for protecting the metering module from gas corrosion, and the channel cover is fixedly connected with the metering module through screws or buckles after being connected with the metering module.

6. A high precision ultrasonic metering channel according to any one of claims 1-5, characterized in that the channel bracket and the metering channel housing are fixed by a snap or a screw.

7. A high precision ultrasonic measuring channel according to any of claims 1-5, characterized in that the measuring module is connected with the channel bracket by means of snap, heat welding, ultrasonic welding or screws.

Technical Field

The invention belongs to the technical field of ultrasonic basic meter structures, and particularly relates to a metering channel of an ultrasonic gas meter.

Technical Field

When an ultrasonic beam propagates in a fluid, the flow of the fluid will produce a small change in propagation time, and the change in propagation time is proportional to the flow velocity of the fluid. Under the framework of the principle, a pair of ultrasonic transducers (as shown in fig. 1) is arranged in the gas flow direction of a gas meter metering channel of the existing ultrasonic gas meter metering module on the market, the ultrasonic transducers transmit and receive simultaneously (or alternately) during working, the flow velocity of gas in the metering channel is obtained through calculation according to the time difference of receiving sound waves at the upstream and the downstream, and then the instantaneous flow is obtained through multiplication of the flow velocity and the channel sectional area.

As shown in fig. 2, it is a measuring channel of a domestic ultrasonic gas meter. As shown in fig. 3 and 4, partition sheets are arranged in the channel at equal intervals for limiting the gas flow direction to be consistent with the channel direction; since the fuel gas is mixed gas, the straight pipe section (fig. 3,3L) of the passage for the gas to enter the partition sheet area is used for mutually rectifying and mixing the gas so as to reduce metering errors caused by non-uniformity of various gases. As the ultrasonic gas meter is applied to the commercial field, the flow and the pressure are far larger than those of the civil field. As shown in fig. 5, for the current commercial ultrasonic gas meter measuring channel, on the basis of the civil ultrasonic measuring channel, the channel width is increased (the number of the separation sheets is increased according to the interval proportion), so that the sectional area of the channel is increased, and the commercial ultrasonic gas meter meets the requirement of large flow in the commercial environment.

In order to meet the requirements of production process and production precision, a pair of ultrasonic transducers is connected with the main control board through a support to form a metering module.

But the metering module can only calculate the flow rate of the gas in the area below the module. Only the width of the measuring channel is widened, so that the flow speed difference of gas in the separating sheet is too large while the ventilation quantity of the measuring channel is increased, and the measuring accuracy of the gas meter is reduced.

The metering module is used as an important component of the ultrasonic gas meter, and the reliable operation of the metering module has great influence on the normal metering and use of the gas meter. The commercial ultrasonic gas meter has higher manufacturing cost, and the loss of the fault to gas companies and gas users is far greater than that of the common civil ultrasonic gas meter.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the high-precision ultrasonic metering channel. According to the ultrasonic metering principle, on the premise of widening the width of the metering channel, two metering modules are arranged above the channel, the two metering modules are in mirror symmetry on the metering channel, after the instantaneous gas flow is respectively obtained, an average instantaneous flow can be obtained through calculation, the obtained average instantaneous flow is closer to the actual instantaneous gas flow than the instantaneous flow obtained by a single metering module, and the metering accuracy of the ultrasonic gas meter in a commercial environment can be greatly improved.

And accuracy and stability compare in single measurement module passageway and have very big promotion, can further design the measurement passageway of bigger width to satisfy the commercial gas table demand of more large-traffic.

A high-precision ultrasonic metering channel comprises a metering channel shell, a separation sheet, a baffle, a channel bracket, a metering module and a channel cover.

The separation sheet is arranged in the metering channel shell, and the blocking piece is arranged at an opening above the metering channel shell; the channel cover is connected with the metering channel shell and matched with an opening above the metering channel shell, and the channel bracket and the metering module are arranged in a cavity formed by the channel cover and the metering channel shell; the channel bracket is of an axisymmetric structure, is connected with the metering channel shell and corresponds to the position of the baffle; the two metering modules are respectively arranged at the left side and the right side of the symmetrical axis of the channel bracket.

The metering channel shell is internally provided with clamping grooves with equal intervals for mounting the separating sheets, and an opening above the metering channel shell is provided with a groove;

the separating sheets are inserted into the clamping grooves which are uniformly arranged in the shell of the metering channel at equal intervals, and the clamping grooves and the separating sheets are in interference fit;

the separation blade is flatly placed in a groove above the metering channel shell and used for sealing an opening above the metering channel shell, so that gas cannot escape back to a gas meter after passing through a metering area, and the gas cannot enter the channel from the rear of the metering area to leak metering. The separation blade is opened there are 4 through-holes, and the through-hole is located metering module ultrasonic transducer below for metering module acoustic beam passes.

The channel cover is used for protecting the metering module from being corroded by gas, and the channel cover is fixedly connected with the metering channel shell through screws or buckles after being connected with the metering module through the buckles.

Furthermore, the channel bracket and the metering channel shell are fixed through a buckle or a screw.

Furthermore, the metering module is connected with the channel bracket through a buckle, a thermal welding, an ultrasonic welding or a screw.

The invention has the following beneficial effects:

because the double metering modules are arranged on the metering channel, under the condition that one metering module is damaged, after system self-checking is found, the other metering module which normally operates can independently meter, and the loss of the commercial gas meter to manufacturers, gas companies and gas users caused by the faults of the metering channel is greatly reduced.

The scheme has the advantages of high accuracy, high stability and large flow, can greatly reduce the probability of damage in the use of the gas meter, and greatly meets the requirements and benefits of manufacturers, gas companies and gas users.

Drawings

FIG. 1 is a schematic view of the ultrasonic metrology principle;

FIG. 2 is a characteristic view of a civil ultrasonic metering channel;

FIG. 3 is a cross-sectional view of a civilian ultrasonic metering tunnel;

FIG. 4 is an exploded view of a civilian ultrasonic metering tunnel;

FIG. 5 is a characteristic view of a prior art commercial ultrasonic metering channel;

FIG. 6 is a characteristic view of an embodiment of the present invention;

fig. 7 is an exploded view of an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described with reference to the accompanying drawings and examples.

As shown in fig. 6 and 7, the high-precision ultrasonic metering channel includes a metering channel housing 7f, a partition sheet 7e, a baffle 7d, a channel holder 7c, a metering module 7b, and a channel cover 7 a.

The separation sheet 7e is arranged in the metering channel shell 7f, and the baffle 7d is arranged at an opening above the metering channel shell 7 f; the channel cover 7a is connected to the metering channel housing 7f, and the channel support 7c and the metering module 7b are arranged in the cavity formed by the channel cover 7a and the metering channel housing 7 f. The channel bracket 7c is in an axisymmetric structure, is connected with the metering channel shell 7f and corresponds to the position of the baffle 7 d; the two metering modules 7b are respectively arranged at the left side and the right side of the symmetry axis of the channel bracket 7 c.

The metering channel shell 7f is internally provided with clamping grooves with equal intervals for mounting the separating sheets 7e, and an opening above the metering channel shell 7f is provided with a groove;

the separating thin slice 7e is inserted into the clamping grooves with equal distance and uniform distance of the metering channel shell 7f, and the clamping grooves and the separating thin slice 7e are in interference fit;

the baffle 7d is flatly placed at a groove above the metering channel shell 7f and used for sealing an opening above the metering channel shell 7f, so that gas cannot escape back to a gas meter after passing through a metering area, and gas cannot enter the channel from the rear of the metering area to leak and be metered. The baffle 7d is provided with 4 through holes which are positioned below the ultrasonic transducer of the metering module and used for the acoustic beam of the metering module 7b to pass through.

The channel cover 7a is used for protecting the metering module 7b from being corroded by gas, and after the channel cover 7a is connected with the metering module 7b through a buckle, the metering channel shell 7f is fixedly connected through screws or buckles.

Further, the channel bracket 7c is fixed to the metering channel housing 7f by a snap and a screw.

Further, the metering module 7b is connected with the channel bracket 7c by a buckle, a thermal welding, an ultrasonic welding or a screw;

the above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.