WO2019024510A1 - Axial bi-injection ultrasonic gas flow measuring gas line - Google Patents
Axial bi-injection ultrasonic gas flow measuring gas line Download PDFInfo
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- WO2019024510A1 WO2019024510A1 PCT/CN2018/079424 CN2018079424W WO2019024510A1 WO 2019024510 A1 WO2019024510 A1 WO 2019024510A1 CN 2018079424 W CN2018079424 W CN 2018079424W WO 2019024510 A1 WO2019024510 A1 WO 2019024510A1
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- pipe section
- gas
- flow measuring
- gas flow
- transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
Definitions
- the invention relates to an axial beam-type ultrasonic gas flow measuring gas path, belonging to the technical field of measuring devices.
- the prior art ultrasonic gas flow measuring device has two characteristics: one is that the measuring pipe section has a rectangular cross section, and a plurality of longitudinal baffles are built in, and the distance between the upstream ultrasonic transducer and the downstream ultrasonic transducer is short. .
- the structure is not easy to process and has limited measurement accuracy.
- the gas path in the ultrasonic gas flow measuring device is semi-open, that is, one end of the measuring pipe section is connected to the device interface, and the other end of the measuring pipe section is open. of.
- the gas is filled in the casing of the device and is closed by the casing, which requires high sealing of the casing.
- the present invention provides an axial beam-type ultrasonic gas flow measuring gas path with high measurement accuracy and low sealing performance.
- an axial-optical ultrasonic gas flow measuring gas path which is characterized in that: a gas flow measuring pipe section, an intake pipe section, an air outlet pipe section, and an axially opposed upstream ultrasonic wave are included.
- a transducer, an axially opposed downstream ultrasonic transducer, the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer are respectively coaxially mounted opposite to each other in the gas flow measuring tube segment
- the two ends constitute an axial-optical gas flow measuring structure
- the intake pipe segment and the gas outlet pipe segment are vertically connected to both ends of the gas flow measuring pipe segment and form a concave-shaped structure
- the outlet pipe section has an upper end opening, and the lower end is a closed structure
- the inlet pipe section, the gas flow measuring pipe section, and the inner cavity of the outlet pipe section are connected to form a concave-shaped airflow passage, and the axial-direction upstream ultrasonic transduction
- an axially opposed downstream ultrasonic transducer are located in the airflow passage, the airflow passage has a circular cross section, and a gas valve is arranged on the outlet pipe section,
- the measured airflow enters the intake pipe section from the port of the intake pipe section, flows vertically downward to the bottom, and then flows through the gas flow measuring pipe section, that is, flows from one end of the gas flow measuring pipe section to the other end in the horizontal direction, and then Vertically entering the outlet pipe section is a concave airflow path.
- the air flow passage has a concave path and is completely sealed in the concave cavity, so that the sealing property to the outer casing is low.
- the gas flow measuring tube section and the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer combine to form a long-distance, axial-optical gas flow measuring structure, which can make the measurement precision more high.
- a pressure sensor is used to measure the gas pressure in the gas path
- a temperature sensor is used to measure the temperature in the gas path.
- Gas valves are used to control the closing and opening of the gas path. The open ends of the intake pipe section and the outlet pipe section are connected to the gas supply means and the gas supply pipe.
- the inlet end of the inlet pipe section and the outlet pipe section are provided with a joint.
- the axially-opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer each include a transducer housing and a transducer mounted in the transducer housing
- the connecting structure is designed to be connected to the gas flow measuring tube section and can be positioned and sealed to the measuring line to ensure alignment of the upstream transducer and the downstream transducer axis, so that the ultrasonic signal intensity The best, to avoid the deviation of the signal after the deviation, affecting the normal progress of the measurement, is conducive to improve the measurement accuracy, while the design of the sealing structure can prevent air leakage.
- the design of the guide fence can guide the airflow in the measuring pipeline, which can effectively reduce the airflow non-uniformity caused by the transducer body in the measuring pipeline and improve the measurement accuracy.
- the sealing structure is at least one concave-convex groove structure, and the concave-convex groove structure is provided with an O-shaped sealing ring.
- the invention has the advantages that the structure of the invention is simple, the cross section of the gas path is circular, the air passage is a concave path, and is completely sealed in the concave cavity, so the sealing requirement for the outer casing is low.
- the combination of the gas flow measuring pipe section and the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer constitute a long-distance, axial-optical gas flow measuring structure, which can make the measuring precision higher.
- the invention adopts an ultrasonic transducer designed with special structure, which not only reduces the influence of the transducer itself on the uniformity of the airflow, improves the measurement precision, but also ensures a good docking between the ultrasonic transducer and the measuring pipe segment. And positioning, to ensure the alignment of the upstream ultrasonic transducer and the downstream ultrasonic transducer, to ensure the best ultrasonic signal strength, to avoid weakening of the signal after the deviation, affecting the normal progress of the measurement.
- Figure 1 is a front elevational view of the present invention
- Figure 2 is a left side view of Figure 1;
- Figure 3 is a cross-sectional view taken along line A-A of Figure 1;
- Figure 4 is a schematic perspective view of the present invention.
- Figure 5 is a schematic structural view of an intake pipe section in the present invention.
- Figure 6 is a schematic structural view of an outlet pipe section in the present invention.
- Figure 7 is a front elevational view of the axially-optical ultrasonic transducer of the present invention.
- Figure 8 is a cross-sectional view taken along line B-B of Figure 7;
- Figure 9 is a left side view of Figure 7;
- Figure 10 is a perspective view showing the structure of an ultrasonic transducer in the present invention.
- an axial through-beam ultrasonic gas flow measuring gas path includes a gas flow measuring pipe section 2, an intake pipe section 1, an outlet pipe section 3, and an axially opposed upstream ultrasonic transducer 4, An axially opposed downstream ultrasonic transducer 5.
- a pressure sensor 6 and a temperature sensor 7 are provided on the gas flow measuring pipe section 2.
- the axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 are respectively coaxially oppositely mounted at opposite ends of the gas flow measuring tube section 2 to constitute an axially opposed gas flow. Measuring structure.
- the air inlet pipe section 1 and the air outlet pipe section 3 are both open at the upper end, and the lower end is a closed structure, and the pipe wall is provided with a connecting portion 17, and the air inlet pipe segment 1 and the air outlet pipe segment 3 respectively pass through the connecting portion thereof. 17 is vertically connected to both ends of the gas flow measuring tube section 2 to form a concave-shaped structure, and the inlet pipe section 1 and the connecting portion of the gas outlet pipe section 3 and the gas flow measuring pipe section 2 are each provided with an O-shaped seal. Circle seal.
- the inlet pipe section 1, the gas flow measuring pipe section 2, and the inner cavity of the outlet pipe section 3 are connected to form a concave-shaped airflow passage, and the axial-opposing upstream ultrasonic transducer 4 and the axially-targeting downstream ultrasonic wave exchange
- the energy detectors 5 are all located in the air flow passage, and the air flow passages are all circular in cross section.
- a gas valve 8 is provided on the outlet pipe section 3.
- a connecting head 11 is disposed at the open end of the intake pipe section 1 and the outlet pipe section 3 for connection with the gas supply device and the gas supply pipe.
- the axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 of the present invention can employ the prior art.
- the axial-optical ultrasonic transducer in this embodiment adopts the following structure: the axial-opposing upstream ultrasonic transducer 4 and the axial-optical downstream ultrasonic transducer 5 Each includes a transducer housing 12, a transducer core 13 mounted in the transducer housing 12, and a cylindrical connection structure coaxially disposed at one end of the transducer housing 12 and connectable to the gas flow measuring tube segment.
- the sealing structure is at least one concave-convex groove structure, and the O-shaped sealing ring 16 is disposed in the concave-convex groove structure.
- the connecting structure portion 15 of the axial-wave type ultrasonic transducer is connected to the gas flow measuring tube section, and is positioned by the connecting structure portion 15 to ensure two axially-optical ultrasonic transducer pairs upstream and downstream. quasi.
- the sealing structure provided on the connecting structure portion 15 can seal between the connecting structure portion 15 and the gas flow measuring tube section to prevent airflow leakage.
- the measured airflow enters the intake pipe section 1 from the inlet gas inlet 10 of the intake pipe section 1, flows vertically downward to the bottom, and then flows through the gas flow measuring pipe section 2, that is, from the gas flow measuring pipe section 2 in the horizontal direction.
- One end flows to the other end, then vertically upwards
- the outlet pipe section 3 is a concave air flow passage.
- the air flow passage has a concave path and is completely sealed in the concave cavity, so that the sealing property to the outer casing is low.
- the gas flow measuring pipe section 2 is combined with the axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 to form a long-distance, axial-optical gas flow measuring structure, Make measurement accuracy higher.
- the pressure sensor 6 is used to measure the gas pressure in the gas path
- the temperature sensor 7 is used to measure the temperature in the gas path.
- the gas valve 8 is used to control the closing and opening of the gas passage.
- the open ends of the intake pipe section 1 and the outlet pipe section 3 are for connection with the gas supply means and the gas supply pipe.
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- Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
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- General Physics & Mathematics (AREA)
Abstract
Disclosed is an axial bi-injection ultrasonic gas flow measuring gas line, comprising a gas flow measuring pipe section (2), a gas intake pipe section (1), a gas discharge pipe section (3), an axial bi-injection upstream ultrasonic transducer (4), and an axial bi-injection downstream ultrasonic transducer (5), wherein the axial bi-injection upstream ultrasonic transducer (4) and the axial bi-injection downstream ultrasonic transducer (5) are respectively coaxially and oppositely installed on two ends of the gas flow measuring pipe section (2), the gas intake pipe section (1) and the gas discharge pipe section (3) are respectively perpendicularly connected to two ends of the gas flow measuring pipe section (2) and form a U-shaped structure, inner cavities of the gas intake pipe section (1), the gas flow measuring pipe section (2) and the gas discharge pipe section (3) communicate to form a U-shaped gas stream channel, the axial bi-injection upstream ultrasonic transducer (4) and the axial bi-injection downstream ultrasonic transducer (5) are both located in the gas stream channel, the cross section of all the gas stream channels is circular, a gas valve (8) is provided on the gas discharge pipe section (3), and a pressure sensor (6) and a temperature sensor (7) are provided on the gas flow measuring pipe section (2).
Description
技术领域Technical field
本发明涉及一种轴向对射式超声波气体流量测量气路，属于测量装置技术领域。The invention relates to an axial beam-type ultrasonic gas flow measuring gas path, belonging to the technical field of measuring devices.
背景技术Background technique
现有技术中的超声波气体流量测量装置有两个特点：其一是测量管段的横截面为矩形，内置多片纵向导流片，上游超声波换能器与下游超声波换能器之间的距离短。该种结构不易加工制作，且测量精度受限；其二是超声波气体流量测量装置内的气路为半开放式的，即测量管段的一端与其装置接口相连，而测量管段的另一端是开放式的。该种结构，气体充盈于装置壳体内被壳体封闭，其对壳体的密封性要求高。The prior art ultrasonic gas flow measuring device has two characteristics: one is that the measuring pipe section has a rectangular cross section, and a plurality of longitudinal baffles are built in, and the distance between the upstream ultrasonic transducer and the downstream ultrasonic transducer is short. . The structure is not easy to process and has limited measurement accuracy. The second is that the gas path in the ultrasonic gas flow measuring device is semi-open, that is, one end of the measuring pipe section is connected to the device interface, and the other end of the measuring pipe section is open. of. In this structure, the gas is filled in the casing of the device and is closed by the casing, which requires high sealing of the casing.
发明内容Summary of the invention
针对现有技术中存在的上述缺陷，本发明提供了一种测量精度高、对密封性要求低的轴向对射式超声波气体流量测量气路。In view of the above-mentioned drawbacks existing in the prior art, the present invention provides an axial beam-type ultrasonic gas flow measuring gas path with high measurement accuracy and low sealing performance.
本发明是通过如下技术方案来实现的：一种轴向对射式超声波气体流量测量气路，其特征是：包括气体流量测量管段、进气管段、出气管段、轴向对射式上游超声波换能器、轴向对射式下游超声波换能器，所述轴向对射式上游超声波换能器和轴向对射式下游超声波换能器分别同轴相对安装在所述气体流量测量管段的两端构成轴向对射式气体流量测量结构，所述进气管段和所述出气管段分别垂直连接在所述气体流量测量管段的两端上并形成凹字形结构，所述进气管段和所述出气管段均上端开口，下端为封闭结构，所述进气管段、气体流量测量管段、出气管段的内腔连通形成凹字形气流通道，所述轴向对射式上游超声波换能器和轴向对射式下游超声波换能器均位于所述气流通道内，所述气流通道的横截面均为圆形，在所述出气管段上设有气体阀门，在所述气体流量测量管段上设有用于测量气路中的气体压力的压力传感器、用于测量气路中的温度的温度传感器。The invention is realized by the following technical solution: an axial-optical ultrasonic gas flow measuring gas path, which is characterized in that: a gas flow measuring pipe section, an intake pipe section, an air outlet pipe section, and an axially opposed upstream ultrasonic wave are included. a transducer, an axially opposed downstream ultrasonic transducer, the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer are respectively coaxially mounted opposite to each other in the gas flow measuring tube segment The two ends constitute an axial-optical gas flow measuring structure, and the intake pipe segment and the gas outlet pipe segment are vertically connected to both ends of the gas flow measuring pipe segment and form a concave-shaped structure, and the intake pipe segment And the outlet pipe section has an upper end opening, and the lower end is a closed structure, and the inlet pipe section, the gas flow measuring pipe section, and the inner cavity of the outlet pipe section are connected to form a concave-shaped airflow passage, and the axial-direction upstream ultrasonic transduction And an axially opposed downstream ultrasonic transducer are located in the airflow passage, the airflow passage has a circular cross section, and a gas valve is arranged on the outlet pipe section, A pressure sensor for measuring the gas pressure in the gas path of said gas flow tube measuring section for measuring the temperature of a temperature sensor in the gas path.
本发明使用时，被测气流自进气管段的端口进入进气管段，垂直向下流至底部，然后流经气体流量测量管段，即沿水平方向从气体流量测量管段的一端流至另一端，然后垂直向上进入出气管段，即为凹形气流通路。气流通道为凹字形路径，并被完全密封在凹字形腔内，故对外壳的密封性要求低。本发明中，气体流量测量管段与轴向对射式上游超声波换能器及轴向对射式下游超声波换能器组合构成长距离、轴向对射式气体流量测量结构，可使测量精度更高。压力传感器用于测量气路中的气体压力，温度传感器用于测量气路中的温度。气体阀门用于控制气体通路的关闭和开启。进气管段和出气管段的开口端用于与用气装置和供气管道连接。When the invention is used, the measured airflow enters the intake pipe section from the port of the intake pipe section, flows vertically downward to the bottom, and then flows through the gas flow measuring pipe section, that is, flows from one end of the gas flow measuring pipe section to the other end in the horizontal direction, and then Vertically entering the outlet pipe section is a concave airflow path. The air flow passage has a concave path and is completely sealed in the concave cavity, so that the sealing property to the outer casing is low. In the present invention, the gas flow measuring tube section and the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer combine to form a long-distance, axial-optical gas flow measuring structure, which can make the measurement precision more high. A pressure sensor is used to measure the gas pressure in the gas path, and a temperature sensor is used to measure the temperature in the gas path. Gas valves are used to control the closing and opening of the gas path. The open ends of the intake pipe section and the outlet pipe section are connected to the gas supply means and the gas supply pipe.
进一步的，为便于与用气装置和供气管道连接，所述进气管段和出气管段的开口端均设有连接头。Further, in order to facilitate connection with the gas device and the gas supply pipe, the inlet end of the inlet pipe section and the outlet pipe section are provided with a joint.
为进一步提高测量精度，所述轴向对射式上游超声波换能器和所述轴向对射式下游超声波换能器均包括换能器壳体、装配在换能器壳体内的换能器内核、同轴设置在换能器壳体一端可与气体流量测量管段连接的圆筒状的连接结构部、沿轴向设置在换能器壳体外表面和连接结构部的内侧壁之间的多个导流栅，所述导流栅与换能器壳体、连接结构部的内侧壁之间形成多个气流通道，所述连接结构部的外侧壁上设有用于与气体流量测量管段密封的密封结构。连接结构部的设计可使其与气体流量测量管段连接并可对其进行定位及使其与测量管路之间密封，保证上游换能器和下游换能器的轴线对准，使超声波信号强度最佳，避免偏离后信号减弱，影响测量的正常进行，有利于提高测量精度，同时密封结构的设计可防止气流泄漏。导流栅的设计可将测量管路内的气流进行导流，可有效降低测量管路中换能器主体引起的气流不均匀性，提高测量精度。To further improve measurement accuracy, the axially-opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer each include a transducer housing and a transducer mounted in the transducer housing The core, the coaxial connecting structure disposed at one end of the transducer housing and the gas flow measuring tube section, and the axially disposed between the outer surface of the transducer housing and the inner side wall of the connecting structure portion a flow guiding fence, a plurality of air flow passages are formed between the flow guiding grid and the inner wall of the transducer housing and the connecting structure portion, and the outer side wall of the connecting structure portion is provided with a sealing portion for sealing the gas flow measuring tube Sealing structure. The connecting structure is designed to be connected to the gas flow measuring tube section and can be positioned and sealed to the measuring line to ensure alignment of the upstream transducer and the downstream transducer axis, so that the ultrasonic signal intensity The best, to avoid the deviation of the signal after the deviation, affecting the normal progress of the measurement, is conducive to improve the measurement accuracy, while the design of the sealing structure can prevent air leakage. The design of the guide fence can guide the airflow in the measuring pipeline, which can effectively reduce the airflow non-uniformity caused by the transducer body in the measuring pipeline and improve the measurement accuracy.
进一步的，所述密封结构为至少一个的凹凸槽结构，所述凹凸槽结构内设有O形密封圈。Further, the sealing structure is at least one concave-convex groove structure, and the concave-convex groove structure is provided with an O-shaped sealing ring.
本发明的有益效果是：本发明结构简单，气路横截面均为圆形，气流通道为凹字形路径，并被完全密封在凹字形腔内，故对外壳的密封性要求低。气体流量测量管段与轴向对射式上游超声波换能器及轴向对射式下游超声波换能器组合构成长距离、轴向对射式气体流量测量结构，可使测量精度更高。此外，本发明通过采用特殊结构设计的超声波换能器，既减小了换能器本身对气流均匀性的影响，提高了测量精度，又保证了超声波换能器与测量管段之间的良好对接与定位，确保上游超声波换能器及下游超声波换能器的对准，保证超声波信号强度最佳，避免偏离后信号减弱，影响测量的正常进行。The invention has the advantages that the structure of the invention is simple, the cross section of the gas path is circular, the air passage is a concave path, and is completely sealed in the concave cavity, so the sealing requirement for the outer casing is low. The combination of the gas flow measuring pipe section and the axially opposed upstream ultrasonic transducer and the axially opposed downstream ultrasonic transducer constitute a long-distance, axial-optical gas flow measuring structure, which can make the measuring precision higher. In addition, the invention adopts an ultrasonic transducer designed with special structure, which not only reduces the influence of the transducer itself on the uniformity of the airflow, improves the measurement precision, but also ensures a good docking between the ultrasonic transducer and the measuring pipe segment. And positioning, to ensure the alignment of the upstream ultrasonic transducer and the downstream ultrasonic transducer, to ensure the best ultrasonic signal strength, to avoid weakening of the signal after the deviation, affecting the normal progress of the measurement.
附图说明DRAWINGS
图1是本发明的主视示意图；Figure 1 is a front elevational view of the present invention;
图2是图1的左视图；Figure 2 is a left side view of Figure 1;
图3是图1中的A-A剖视示意图；Figure 3 is a cross-sectional view taken along line A-A of Figure 1;
图4是本发明的立体结构示意图；Figure 4 is a schematic perspective view of the present invention;
图5是本发明中的进气管段的结构示意图；Figure 5 is a schematic structural view of an intake pipe section in the present invention;
图6是本发明中的出气管段的结构示意图；Figure 6 is a schematic structural view of an outlet pipe section in the present invention;
图7是本发明中的轴向对射式超声波换能器的主视图；Figure 7 is a front elevational view of the axially-optical ultrasonic transducer of the present invention;
图8是图7中的B-B剖视示意图；Figure 8 is a cross-sectional view taken along line B-B of Figure 7;
图9是图7的左视图；Figure 9 is a left side view of Figure 7;
图10是本发明中的超声波换能器的立体结构示意图；Figure 10 is a perspective view showing the structure of an ultrasonic transducer in the present invention;
图中，1、进气管段，2、气体流量测量管段，3、出气管段，4、轴向对射式上游超声波换能器，5、轴向对射式下游超声波换能器,6、压力传感器，7、温度传感器，8、气体阀门，9、气体出口，10、气体入口，11、连接头，12、换能器壳体，13、换能器内核，14、导流栅，15、连接结构部，16、O形密封圈。In the figure, 1, the intake pipe section, 2, the gas flow measuring pipe section, 3, the outlet pipe section, 4, the axial anti-wave type upstream ultrasonic transducer, 5, the axial-beam type downstream ultrasonic transducer, 6, Pressure sensor, 7, temperature sensor, 8, gas valve, 9, gas outlet, 10, gas inlet, 11, connector, 12, transducer housing, 13, transducer core, 14, flow grid, 15 , connecting structure, 16, O-ring seal.
具体实施方式Detailed ways
下面通过非限定性的实施例并结合附图对本发明作进一步的说明：The invention is further illustrated by the following non-limiting examples in conjunction with the accompanying drawings:
如附图所示，一种轴向对射式超声波气体流量测量气路，其包括气体流量测量管段2、进气管段1、出气管段3、轴向对射式上游超声波换能器4、轴向对射式下游超声波换能器5。在所述气体流量测量管段2上设有压力传感器6、温度传感器7。所述轴向对射式上游超声波换能器4和轴向对射式下游超声波换能器5分别同轴相对安装在所述气体流量测量管段2的两端，构成轴向对射式气体流量测量结构。所述进气管段1和所述出气管段3均上端开口，下端为封闭结构，其管壁上设有连接部分17，所述进气管段1和所述出气管段3分别通过其连接部分17垂直连接在所述气体流量测量管段2的两端上，从而形成凹字形结构，所述进气管段1和所述出气管段3与气体流量测量管段2的连接部分均设有O形密封圈密封。所述进气管段1、气体流量测量管段2、出气管段3的内腔相连通形成凹字形气流通道，所述轴向对射式上游超声波换能器4和轴向对射式下游超声波换能器5均位于所述气流通道内，且所述气流通道的横截面均为圆形。在所述出气管段3上设有气体阀门8。在所述进气管段1和所述出气管段3的开口端均设有连接头11，用于与用气装置和供气管道连接。As shown in the accompanying drawings, an axial through-beam ultrasonic gas flow measuring gas path includes a gas flow measuring pipe section 2, an intake pipe section 1, an outlet pipe section 3, and an axially opposed upstream ultrasonic transducer 4, An axially opposed downstream ultrasonic transducer 5. A pressure sensor 6 and a temperature sensor 7 are provided on the gas flow measuring pipe section 2. The axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 are respectively coaxially oppositely mounted at opposite ends of the gas flow measuring tube section 2 to constitute an axially opposed gas flow. Measuring structure. The air inlet pipe section 1 and the air outlet pipe section 3 are both open at the upper end, and the lower end is a closed structure, and the pipe wall is provided with a connecting portion 17, and the air inlet pipe segment 1 and the air outlet pipe segment 3 respectively pass through the connecting portion thereof. 17 is vertically connected to both ends of the gas flow measuring tube section 2 to form a concave-shaped structure, and the inlet pipe section 1 and the connecting portion of the gas outlet pipe section 3 and the gas flow measuring pipe section 2 are each provided with an O-shaped seal. Circle seal. The inlet pipe section 1, the gas flow measuring pipe section 2, and the inner cavity of the outlet pipe section 3 are connected to form a concave-shaped airflow passage, and the axial-opposing upstream ultrasonic transducer 4 and the axially-targeting downstream ultrasonic wave exchange The energy detectors 5 are all located in the air flow passage, and the air flow passages are all circular in cross section. A gas valve 8 is provided on the outlet pipe section 3. A connecting head 11 is disposed at the open end of the intake pipe section 1 and the outlet pipe section 3 for connection with the gas supply device and the gas supply pipe.
本发明中的轴向对射式上游超声波换能器4和轴向对射式下游超声波换能器5可采用现有技术。为提高测量精度，本实施例中的轴向对射式超声波换能器采用如下结构：所述轴向对射式上游超声波换能器4和所述轴向对射式下游超声波换能器5均包括换能器壳体12、装配在换能器壳体12内的换能器内核13、同轴设置在换能器壳体12一端可与气体流量测量管段连接的圆筒状的连接结构部15、沿轴向设置在换能器壳体12外表面和连接结构部15的内侧壁之间的多个导流栅14，所述导流栅14与换能器壳体12、连接结构部15的内侧壁之间形成多个气流通道，所述连接结构部15的外侧壁上设有用于与气体流量测量管段密封的密封结构。优选的是，所述密封结构为至少一个的凹凸槽结构，所述凹凸槽结构内设有O形密封圈16。安装时，轴向对射式超声波换能器的连接结构部15与气体流量测量管段连接，并通过该连接结构部15进行定位，保证上下游的两个轴向对射式超声波换能器对准。该连接结构部15上设置的密封结构可使连接结构部15与气体流量测量管段之间密封，防止气流泄漏。The axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 of the present invention can employ the prior art. In order to improve the measurement accuracy, the axial-optical ultrasonic transducer in this embodiment adopts the following structure: the axial-opposing upstream ultrasonic transducer 4 and the axial-optical downstream ultrasonic transducer 5 Each includes a transducer housing 12, a transducer core 13 mounted in the transducer housing 12, and a cylindrical connection structure coaxially disposed at one end of the transducer housing 12 and connectable to the gas flow measuring tube segment. a plurality of flow guiding dams 14 disposed axially between the outer surface of the transducer housing 12 and the inner side wall of the connecting structure portion 15, the flow guiding grid 14 and the transducer housing 12, and the connecting structure A plurality of air flow passages are formed between the inner side walls of the portion 15, and the outer side wall of the connecting structure portion 15 is provided with a sealing structure for sealing with the gas flow measuring tube portion. Preferably, the sealing structure is at least one concave-convex groove structure, and the O-shaped sealing ring 16 is disposed in the concave-convex groove structure. During installation, the connecting structure portion 15 of the axial-wave type ultrasonic transducer is connected to the gas flow measuring tube section, and is positioned by the connecting structure portion 15 to ensure two axially-optical ultrasonic transducer pairs upstream and downstream. quasi. The sealing structure provided on the connecting structure portion 15 can seal between the connecting structure portion 15 and the gas flow measuring tube section to prevent airflow leakage.
本发明使用时，被测气流自进气管段1的进气体入口10进入进气管段1，垂直向下流至底部，然后流经气体流量测量管段2，即沿水平方向从气体流量测量管段2的一端流至另一端，然后垂直向上进入
出气管段3，即为凹形气流通路。气流通道为凹字形路径，并被完全密封在凹字形腔内，故对外壳的密封性要求低。本实用新型中，气体流量测量管段2与轴向对射式上游超声波换能器4及轴向对射式下游超声波换能器5组合构成长距离、轴向对射式气体流量测量结构，可使测量精度更高。压力传感器6用于测量气路中的气体压力，温度传感器7用于测量气路中的温度。气体阀门8用于控制气体通路的关闭和开启。进气管段1和出气管段3的开口端用于与用气装置和供气管道连接。When the invention is used, the measured airflow enters the intake pipe section 1 from the inlet gas inlet 10 of the intake pipe section 1, flows vertically downward to the bottom, and then flows through the gas flow measuring pipe section 2, that is, from the gas flow measuring pipe section 2 in the horizontal direction. One end flows to the other end, then vertically upwards
The outlet pipe section 3 is a concave air flow passage. The air flow passage has a concave path and is completely sealed in the concave cavity, so that the sealing property to the outer casing is low. In the utility model, the gas flow measuring pipe section 2 is combined with the axially opposed upstream ultrasonic transducer 4 and the axially opposed downstream ultrasonic transducer 5 to form a long-distance, axial-optical gas flow measuring structure, Make measurement accuracy higher. The pressure sensor 6 is used to measure the gas pressure in the gas path, and the temperature sensor 7 is used to measure the temperature in the gas path. The gas valve 8 is used to control the closing and opening of the gas passage. The open ends of the intake pipe section 1 and the outlet pipe section 3 are for connection with the gas supply means and the gas supply pipe.
本实施例中的其他部分均为现有技术，在此不再赘述。Other parts in this embodiment are all prior art, and are not described herein again.
Claims (4)
1、一种轴向对射式超声波气体流量测量气路，其特征是：包括气体流量测量管段（2）、进气管段（1）、出气管段（3）、轴向对射式上游超声波换能器（4）、轴向对射式下游超声波换能器（5），所述轴向对射式上游超声波换能器（4）和轴向对射式下游超声波换能器（5）分别同轴相对安装在所述气体流量测量管段（2）的两端构成轴向对射式气体流量测量结构，所述进气管段（1）和所述出气管段（3）分别垂直连接在所述气体流量测量管段（2）的两端上并形成凹字形结构，所述进气管段（1）和所述出气管段（3）均上端开口，下端为封闭结构，所述进气管段（1）、气体流量测量管段（2）、出气管段（3）的内腔连通形成凹字形气流通道，所述轴向对射式上游超声波换能器（4）和轴向对射式下游超声波换能器（5）均位于所述气流通道内，所述气流通道的横截面均为圆形，在所述出气管段（3）上设有气体阀门（8），在所述气体流量测量管段（2）上设有用于测量气路中的气体压力的压力传感器（6）、用于测量气路中的温度的温度传感器（7）。
1. An axial beam-type ultrasonic gas flow measuring gas path, which comprises: a gas flow measuring tube section (2), an inlet pipe section (1), an outlet pipe section (3), and an axially opposed upstream ultrasonic wave. a transducer (4), an axially opposed downstream ultrasonic transducer (5), the axially opposed upstream ultrasonic transducer (4) and an axially opposed downstream ultrasonic transducer (5) The axially opposite-type gas flow measuring structures are respectively configured to be coaxially oppositely mounted at opposite ends of the gas flow measuring tube section (2), and the inlet pipe section (1) and the outlet pipe section (3) are vertically connected a concave structure is formed on both ends of the gas flow measuring pipe section (2), and the upper end of the intake pipe section (1) and the outlet pipe section (3) are open, and the lower end is a closed structure, and the intake pipe section is (1) The gas flow measuring tube section (2) and the inner cavity of the outlet pipe section (3) are connected to form a concave shaped air flow passage, and the axially opposed upstream ultrasonic transducer (4) and the axially opposed downstream Ultrasonic transducers (5) are located in the air flow passage, the gas The cross section of the passage is circular, a gas valve (8) is arranged on the outlet pipe section (3), and a pressure for measuring the gas pressure in the gas path is provided on the gas flow measuring pipe section (2). A sensor (6), a temperature sensor (7) for measuring the temperature in the gas path.
2、根据权利要求1所述的轴向对射式超声波气体流量测量气路，其特征是：所述进气管段（1）和出气管段（3）的开口端均设有连接头。
2. The axial beam-type ultrasonic gas flow measuring gas path according to claim 1, wherein the inlet end of the inlet pipe section (1) and the outlet pipe section (3) are provided with a joint.
3、根据权利要求1所述的轴向对射式超声波气体流量测量气路，其特征是：所述轴向对射式上游超声波换能器（4）和所述轴向对射式下游超声波换能器（5）均包括换能器壳体（12）、装配在换能器壳体（12）内的换能器内核、同轴设置在换能器壳体（12）一端可与气体流量测量管段连接的圆筒状的连接结构部（15）、沿轴向设置在换能器壳体（12）外表面和连接结构部（15）的内侧壁之间的多个导流栅（14），所述导流栅（14）与换能器壳体（12）、连接结构部（15）的内侧壁之间形成多个气流通道，所述连接结构部（15）的外侧壁上设有用于与气体流量测量管段密封的密封结构。3. The axially opposed ultrasonic gas flow measuring gas path according to claim 1, wherein said axially opposed upstream ultrasonic transducer (4) and said axially opposed downstream ultrasonic wave The transducers (5) each include a transducer housing (12), a transducer core mounted in the transducer housing (12), and a coaxially disposed gas at one end of the transducer housing (12) a cylindrical connecting structure portion (15) connected to the flow measuring tube section, a plurality of flow guiding grids disposed axially between the outer surface of the transducer housing (12) and the inner side wall of the connecting structure portion (15) ( 14), a plurality of air flow passages are formed between the flow guiding fence (14) and the inner side wall of the transducer housing (12) and the connecting structure portion (15), and the outer side wall of the connecting structure portion (15) A sealing structure for sealing the gas flow measuring pipe section is provided.
4、根据权利要求3所述的轴向对射式超声波气体流量测量气路，其特征是：所述密封结构为至少一个的凹凸槽结构，所述凹凸槽结构内设有O形密封圈。4. The axial beam-type ultrasonic gas flow measuring gas path according to claim 3, wherein the sealing structure is at least one concave-convex groove structure, and the concave-convex groove structure is provided with an O-shaped sealing ring.
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