CN111623838A - Measuring section structure and method of ultrasonic measuring device - Google Patents
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Abstract
本发明涉及一种超声波测量装置的测量段结构及方法，用于测量流动介质，特别是液体或者气体的超声波测量结构，属于声学、传感技术领域。技术方案是：设置在超声波测量装置的中间部，超声波测量装置包含两端的壳体和中部的测量段；所述测量段内孔的截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道。本发明的有益效果：克服了本领域的技术偏见，通过改变测量段内孔形状，反射镜采用与之匹配的形状，减少和消除漩涡扰流干扰，提高测量准确性。
The invention relates to a measuring section structure and method of an ultrasonic measuring device, which is used for measuring flowing medium, especially an ultrasonic measuring structure of liquid or gas, and belongs to the technical fields of acoustics and sensing. The technical scheme is: it is arranged in the middle part of the ultrasonic measuring device, and the ultrasonic measuring device includes the casing at both ends and the measuring section in the middle; shaped flow channel. Beneficial effects of the present invention: Overcoming the technical prejudice in the field, by changing the shape of the inner hole of the measuring section, the reflector adopts a matching shape, so as to reduce and eliminate the interference of vortex turbulence and improve the measurement accuracy.
Description
技术领域technical field
本发明涉及一种超声波测量装置的测量段结构及方法，用于测量流动介质，特别是液体或者气体的超声波测量结构，属于声学、传感技术领域。The invention relates to a measuring section structure and method of an ultrasonic measuring device, which is used for measuring flowing medium, especially an ultrasonic measuring structure of liquid or gas, and belongs to the technical fields of acoustics and sensing.
背景技术Background technique
目前，现有超声流量传感器结构，特别是小口径超声流量传感器（内径小于40 mm）通常都采用反射体反射超声波的方式进行测量，通过反射体将超声波反射穿过需要测量的流体，计算正逆程的时间差从而推算出流速信息。已有技术的超声流量传感器结构通常由中部的测量段和两端的壳体组成，中部的测量段的内孔为圆，形成圆形的过流通道，测量段两端的壳体内设有反射镜、壳体上设有传感器，两个传感器、两个反射镜与中间的圆形过流通道构成一个U型测量路径，实现对流体的计量。已有技术存在的问题是：由于测量段内孔均为正圆形状，容易受到漩涡扰流干扰，当被测流体受到某种扰动时，会导致流速中心发生偏移，比如水表标准中规定的漩涡扰流或者速度剖面型扰流，若反射体反射的超声波路径没有穿过流体流速中心，所测得数据将会发生失真，从而引起水表的测量误差。面对此问题的通常做法是：1.在水表上游加装整流装置，比如整直器，从而使流体在进入水表之前先将流速中心稳定超声波测量路径上，由于超声波测量装置的整流结构都需要另外单独设置，结构比较复杂，加工组装也十分繁琐。2.加大反射体，从而使反射的超声波面积将所测流体全部覆盖，但这将大大增加水表压损。At present, the existing ultrasonic flow sensor structures, especially small-diameter ultrasonic flow sensors (with an inner diameter of less than 40 mm) usually use a reflector to reflect ultrasonic waves for measurement. The time difference of the process is calculated to calculate the flow rate information. The structure of the ultrasonic flow sensor in the prior art is usually composed of a measuring section in the middle and a shell at both ends. The inner hole of the measuring section in the middle is a circle, forming a circular flow passage. The shells at both ends of the measuring section are provided with mirrors, A sensor is arranged on the shell, and two sensors, two mirrors and a circular flow passage in the middle form a U-shaped measurement path to realize the measurement of the fluid. The existing problems in the prior art are: because the inner holes of the measuring section are all perfect circles, they are easily disturbed by vortex turbulence. When the measured fluid is disturbed, it will cause the center of the flow velocity to shift, such as that specified in the water meter standard. For vortex turbulence or velocity profile turbulence, if the ultrasonic path reflected by the reflector does not pass through the center of the fluid velocity, the measured data will be distorted, resulting in measurement errors of the water meter. The usual way to face this problem is: 1. Install a rectification device upstream of the water meter, such as a rectifier, so that the fluid can first stabilize the flow rate center on the ultrasonic measurement path before entering the water meter. Because the rectification structure of the ultrasonic measurement device needs to be In addition, if it is set separately, the structure is more complicated, and the processing and assembly are also very cumbersome. 2. Enlarge the reflector so that the reflected ultrasonic area will cover all the measured fluid, but this will greatly increase the pressure loss of the water meter.
发明内容SUMMARY OF THE INVENTION
本发明目的是提供一种超声波测量装置的测量段结构及方法，通过改变测量段内孔形状，反射镜采用与之匹配的形状，减少和消除漩涡扰流干扰，提高测量准确性，解决背景技术中存在的问题。The purpose of the present invention is to provide a measuring section structure and method of an ultrasonic measuring device. By changing the shape of the inner hole of the measuring section and adopting a matching shape for the reflector, the interference of vortex turbulence can be reduced and eliminated, the measuring accuracy can be improved, and the background technology can be solved. problems in .
本发明的技术方案是：The technical scheme of the present invention is:
一种超声波测量装置的测量段结构，设置在超声波测量装置的中间部，超声波测量装置包含两端的壳体和中部的测量段；所述测量段内孔的截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道。A measuring section structure of an ultrasonic measuring device is arranged in the middle part of the ultrasonic measuring device, and the ultrasonic measuring device comprises shells at both ends and a measuring section in the middle; An oval or oval-like flow passage is formed.
所述壳体和测量段均为筒状，两端的壳体和中部的测量段之间是组合结构，也可以是一体结构。The casing and the measuring section are both cylindrical, and the casings at both ends and the measuring section in the middle are a combined structure or an integral structure.
所述壳体内设有反射镜，其形状与测量段内孔的椭圆形或者类似椭圆匹配；例如：采用矩形的反射镜、椭圆形或者类似椭圆反射镜、正圆形状的反射镜等等。所述壳体上设有传感器，传感器与反射镜相匹配对应，两个传感器、两个反射镜与中间的椭圆形或者类似椭圆形过流通道构成一个U型测量路径。The housing is provided with a reflector whose shape matches the ellipse or similar ellipse of the inner hole of the measuring section; for example, a rectangular reflector, an ellipse or an ellipse-like reflector, a perfect circle reflector and the like are used. The housing is provided with sensors, the sensors are matched with the reflectors, and the two sensors, the two reflectors and the elliptical or similar elliptical flow passage in the middle form a U-shaped measurement path.
所述反射镜的两侧边与壳体连接并与壳体一体成型。The two sides of the reflector are connected with the casing and are integrally formed with the casing.
所述反射镜形状为具有长轴和短轴的椭圆形或矩形，反射镜的两侧边与壳体连接并与壳体一体成型；测量段内孔的截面形状为具有长轴和短轴的椭圆形或者类似椭圆形，两个壳体和一个测量段相互组合在一起，壳体中反射镜的反射方向与测量段内孔的中心线方向一致，且反射镜的长轴与测量段内孔的长轴相互平行布置。The shape of the reflector is an ellipse or a rectangle with a long axis and a short axis, and the two sides of the reflector are connected to the housing and are integrally formed with the housing; the cross-sectional shape of the inner hole of the measuring section is a long axis and a short axis. Ellipse or similar to ellipse, two shells and one measuring section are combined with each other, the reflection direction of the reflector in the shell is consistent with the centerline direction of the inner hole of the measuring section, and the long axis of the reflecting mirror is the same as the inner hole of the measuring section. The long axes are arranged parallel to each other.
所述测量段是位于两个壳体中间的缩小部分，测量段的内孔截面积小于壳体的内孔截面积；测量段内部过水部分为椭圆孔或者类似椭圆，测量段是一个单独部件，测量段的两端与两个壳体组合形成超声波测量结构；所述的组合方式包括：扣合、粘接、插接、卡扣等方式。The measuring section is a reduced part located in the middle of the two shells, and the cross-sectional area of the inner hole of the measuring section is smaller than that of the shell; the water-passing part inside the measuring section is an elliptical hole or a similar ellipse, and the measuring section is a separate part , the two ends of the measurement section are combined with two shells to form an ultrasonic measurement structure; the combination methods include: buckle, bonding, plugging, snapping and the like.
所述壳体自带整流结构，与壳体一体化成型。The housing has its own rectifying structure and is integrally formed with the housing.
所述的一体成型，为注塑一体成型。The integral molding is injection molding integral molding.
一种超声波测量装置的测量方法，超声波测量装置中间的测量段内孔截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道；超声波测量装置的反射镜形状与测量段内孔的椭圆形或者类似椭圆形相匹配；所述反射镜形状为具有长轴和短轴的椭圆形或矩形，反射镜的两侧边与壳体连接并与壳体一体成型；测量段内孔的截面形状为具有长轴和短轴的椭圆形或者类似椭圆形，两个壳体和一个测量段相互组合在一起，壳体中反射镜的反射方向与测量段内孔的中心线方向一致，且反射镜的长轴与测量段内孔的长轴相互平行布置；所述壳体上设有传感器，传感器与反射镜相匹配对应，两个传感器、两个反射镜与中间的椭圆形或者类似椭圆形过流通道构成一个U型测量路径，实现对流体的测量。A measuring method of an ultrasonic measuring device, the cross-sectional shape of the inner hole of the measuring section in the middle of the ultrasonic measuring device is an ellipse or an ellipse, forming an ellipse or an ellipse-like flow passage; the shape of the reflector of the ultrasonic measuring device and the measuring section The oval shape or similar oval shape of the inner hole matches; the shape of the reflector is an ellipse or a rectangle with a long axis and a short axis, and the two sides of the reflector are connected with the shell and are integrally formed with the shell; the inner hole of the measuring section The cross-sectional shape is an ellipse with a long axis and a short axis or a similar ellipse. Two shells and a measuring section are combined with each other. The reflection direction of the mirror in the shell is consistent with the centerline direction of the inner hole of the measuring section. And the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged parallel to each other; the housing is provided with a sensor, the sensor and the reflector are matched and corresponding, the two sensors and the two reflectors are in the middle of an ellipse or similar The elliptical flow channel forms a U-shaped measurement path to realize the measurement of the fluid.
本发明的主要创新点：已有技术的测量段内孔截面形状均为圆形，本发明改为测量段内孔截面形状为椭圆形或类椭圆形，减少和消除漩涡扰流干扰，提高测量准确性。The main innovation of the present invention is that the cross-sectional shape of the inner hole of the measuring section in the prior art is all circular, and the present invention changes the cross-sectional shape of the inner hole of the measuring section to an elliptical or elliptical-like shape, which reduces and eliminates vortex turbulence interference and improves the measurement performance. accuracy.
本领域（超声计量仪表）长期存在一个技术偏见：认为只有测量段的内孔是正圆形，产生的过流通道也是正圆形，才能实行准确测量，故此，所有超声计量仪表的测量段内孔都是正圆形，形成了技术偏见。但是，在实践中发现正圆形的测量段内孔形成的过流通道会产生旋涡扰动，影响测量精度。由旋转流动的原理可知，在正圆形的测量段内孔形成的过流通道中，由于正圆形过流通道是圆周对称的，旋涡扰动可以在正圆形的过流通道里自由发展并扩散，由于测量段的上游还存在扰流件，会产生叠加于轴向主流之上的二次流，二次流垂直于轴向流动，将会影响超声仪表的计量。而本发明的椭圆形或类椭圆形孔形成的过流通道为非圆周对称形状，旋涡扰动会受到椭圆形或类椭圆形过流通道圆周的抑制；椭圆形或类椭圆形过流通道在同等过流面积的条件下，压缩了过流通道的高度，使二次流受到抑制，比正圆形的过流通道更快恢复到主流方向。There is a long-standing technical bias in this field (ultrasonic metering instruments): it is believed that accurate measurement can only be performed if the inner hole of the measuring section is a perfect circle and the resulting overcurrent channel is also a perfect circle. Therefore, the inner hole of the measuring section of all ultrasonic measuring instruments All are perfect circles, forming a technical bias. However, in practice, it is found that the overflow channel formed by the inner hole of the perfectly circular measurement section will generate vortex disturbance, which will affect the measurement accuracy. It can be seen from the principle of rotating flow that in the flow channel formed by the inner hole of the perfect circular measurement section, since the perfect circular flow channel is circumferentially symmetrical, the vortex disturbance can develop and diffuse freely in the perfect circular flow channel. Due to the presence of a spoiler upstream of the measurement section, a secondary flow superimposed on the axial main flow will be generated. The secondary flow is perpendicular to the axial flow, which will affect the measurement of the ultrasonic instrument. However, the flow passage formed by the elliptical or elliptical-like holes of the present invention is a non-circumferentially symmetrical shape, and the vortex disturbance will be suppressed by the circumference of the elliptical or elliptical-like flow passage; Under the condition of the flow area, the height of the flow channel is compressed, so that the secondary flow is restrained, and it returns to the main flow direction faster than the perfect circular flow channel.
本发明的有益效果：克服了本领域的技术偏见，通过改变测量段内孔形状，反射镜采用与之匹配的形状，减少和消除漩涡扰流干扰，提高测量准确性。Beneficial effects of the present invention: Overcoming the technical prejudice in the field, by changing the shape of the inner hole of the measuring section, the reflector adopts a matching shape, so as to reduce and eliminate the interference of vortex turbulence and improve the measurement accuracy.
附图说明Description of drawings
图1是本发明实施例结构示意图；1 is a schematic structural diagram of an embodiment of the present invention;
图2是本发明实施例剖视结构示意图；Fig. 2 is the sectional structure schematic diagram of the embodiment of the present invention;
图3是本发明实施例反射镜结构示意图；3 is a schematic structural diagram of a mirror according to an embodiment of the present invention;
图4是本发明实施例缩小部分断面示意图；FIG. 4 is a schematic cross-sectional view of a reduced part of an embodiment of the present invention;
图5是本发明实施例反射镜与缩小部分内孔对应关系示意图；5 is a schematic diagram of the corresponding relationship between a reflector and a reduced part of the inner hole according to an embodiment of the present invention;
图6是已有技术测量段内过流通道流态图；Fig. 6 is the flow diagram of the overcurrent channel in the measurement section of the prior art;
图7是本发明测量段内过流通道流态图；Fig. 7 is the flow diagram of the overcurrent passage in the measuring section of the present invention;
图8为本发明椭圆孔测量段和现有技术的正圆孔测量段对比图；8 is a comparison diagram of the oval hole measuring section of the present invention and the perfect circular hole measuring section of the prior art;
图中：整流结构一1、壳体一2、传感器安装孔一3、测量段4、壳体二5、传感器安装孔二6、传感器安装孔二7、反射镜二8、内孔9、反射镜一10。In the figure: rectifier structure one 1, housing one 2, sensor mounting hole one 3, measuring
具体实施方式Detailed ways
以下结合附图，通过实施例对本发明作进一步说明。Below in conjunction with the accompanying drawings, the present invention will be further described through embodiments.
一种超声波测量装置的测量段结构，设置在超声波测量装置的中间部，超声波测量装置包含两端的壳体和中部的测量段4；所述测量段内孔9的截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道。A measuring section structure of an ultrasonic measuring device is arranged in the middle part of the ultrasonic measuring device, and the ultrasonic measuring device includes a casing at both ends and a
所述壳体和测量段均为筒状，两端的壳体和中部的测量段之间是组合结构，也可以是一体结构。The casing and the measuring section are both cylindrical, and the casings at both ends and the measuring section in the middle are a combined structure or an integral structure.
所述壳体内设有反射镜，其形状与测量段内孔的椭圆形或者类似椭圆匹配；例如：采用矩形的反射镜、椭圆形或者类似椭圆反射镜、正圆形状的反射镜等等。所述壳体上设有传感器，传感器与反射镜相匹配对应，两个传感器、两个反射镜与中间的椭圆形或者类似椭圆形过流通道构成一个U型测量路径。The housing is provided with a reflector whose shape matches the ellipse or similar ellipse of the inner hole of the measuring section; for example, a rectangular reflector, an ellipse or an ellipse-like reflector, a perfect circle reflector and the like are used. The housing is provided with sensors, the sensors are matched with the reflectors, and the two sensors, the two reflectors and the elliptical or similar elliptical flow passage in the middle form a U-shaped measurement path.
所述反射镜的两侧边与壳体连接并与壳体一体成型。The two sides of the reflector are connected with the casing and are integrally formed with the casing.
所述反射镜形状为具有长轴和短轴的椭圆形或矩形，反射镜的两侧边与壳体连接并与壳体一体成型；测量段内孔的截面形状为具有长轴和短轴的椭圆形或者类似椭圆形，两个壳体和一个测量段相互组合在一起，壳体中反射镜的反射方向与测量段内孔的中心线方向一致，且反射镜的长轴与测量段内孔的长轴相互平行布置。The shape of the reflector is an ellipse or a rectangle with a long axis and a short axis, and the two sides of the reflector are connected to the housing and are integrally formed with the housing; the cross-sectional shape of the inner hole of the measuring section is a long axis and a short axis. Ellipse or similar to ellipse, two shells and one measuring section are combined with each other, the reflection direction of the reflector in the shell is consistent with the centerline direction of the inner hole of the measuring section, and the long axis of the reflecting mirror is the same as the inner hole of the measuring section. The long axes are arranged parallel to each other.
所述测量段是位于两个壳体中间的缩小部分，测量段的内孔截面积小于壳体的内孔截面积；测量段内部过水部分为椭圆孔或者类似椭圆，测量段是一个单独部件，测量段的两端与两个壳体组合形成超声波测量结构；所述的组合方式包括：扣合、粘接、插接、卡扣等方式。The measuring section is a reduced part located in the middle of the two shells, and the cross-sectional area of the inner hole of the measuring section is smaller than that of the shell; the water-passing part inside the measuring section is an elliptical hole or a similar ellipse, and the measuring section is a separate part , the two ends of the measurement section are combined with two shells to form an ultrasonic measurement structure; the combination methods include: buckle, bonding, plugging, snapping and the like.
所述壳体自带整流结构，与壳体一体化成型。The housing has its own rectifying structure and is integrally formed with the housing.
所述的一体成型，为注塑一体成型。The integral molding is injection molding integral molding.
一种超声波测量装置的测量方法，超声波测量装置中间的测量段内孔截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道；超声波测量装置的反射镜形状与测量段内孔的椭圆形或者类似椭圆形相匹配；所述反射镜形状为具有长轴和短轴的椭圆形或矩形，反射镜的两侧边与壳体连接并与壳体一体成型；测量段内孔的截面形状为具有长轴和短轴的椭圆形或者类似椭圆形，两个壳体和一个测量段相互组合在一起，壳体中反射镜的反射方向与测量段内孔的中心线方向一致，且反射镜的长轴与测量段内孔的长轴相互平行布置；所述壳体上设有传感器，传感器与反射镜相匹配对应，两个传感器、两个反射镜与中间的椭圆形或者类似椭圆形过流通道构成一个U型测量路径，实现对流体的测量。A measuring method of an ultrasonic measuring device, the cross-sectional shape of the inner hole of the measuring section in the middle of the ultrasonic measuring device is an ellipse or an ellipse, forming an ellipse or an ellipse-like flow passage; the shape of the reflector of the ultrasonic measuring device and the measuring section The oval shape or similar oval shape of the inner hole matches; the shape of the reflector is an ellipse or a rectangle with a long axis and a short axis, and the two sides of the reflector are connected with the shell and are integrally formed with the shell; the inner hole of the measuring section The cross-sectional shape is an ellipse with a long axis and a short axis or a similar ellipse. Two shells and a measuring section are combined with each other. The reflection direction of the mirror in the shell is consistent with the centerline direction of the inner hole of the measuring section. And the long axis of the reflector and the long axis of the inner hole of the measuring section are arranged parallel to each other; the housing is provided with a sensor, the sensor and the reflector are matched and corresponding, the two sensors and the two reflectors are in the middle of an ellipse or similar The elliptical flow channel forms a U-shaped measurement path to realize the measurement of the fluid.
所述壳体自带整流结构包括槽口1和凸楞7，所述槽口1开设在壳体的端部，凸楞7纵向设置在壳体端部内壁上，槽口1与凸楞7在壳体端部圆周上交错布置，壳体与槽口1和凸楞7一体成型；所述槽口的形状是任意的，包括条状槽、U型槽、V型开口、半圆开口等等。所述槽口的数量是任意的，多个槽口均设置在壳体的端部，多个槽口的形状可以相同，也可以不同。所述凸楞的截面形状是任意的，包括矩形、方形、梯形、半圆形等等。所述凸楞与壳体一体成型，所述凸楞的数量是任意的，多个凸楞均设置在壳体的端部内壁上，多个凸楞的形状可以相同，也可以不同。The housing comes with a rectifying structure including a
在实施例中，所述壳体数量为两个，分别为壳体一2和壳体二5；所述整流结构数量为两个，分别为整流结构一和整流结构二；所述反射镜为两个，分别为反射镜一10和反射镜二8；在壳体一2上设有传感器安装孔3、整流结构一和反射镜一10，在壳体二5上设有传感器安装孔6、整流结构二和反射镜二8。In the embodiment, the number of the casings is two, which are respectively the
所述测量段内孔9的截面形状为椭圆形或者类似椭圆形，形成椭圆形或者类似椭圆形的过流通道。所述壳体内设有反射镜，其形状与测量段内孔的椭圆形或者类似椭圆形相一致，采用椭圆形或者类似椭圆反射镜。The cross-sectional shape of the
通过实验对比，验证了本发明的技术效果。Through experimental comparison, the technical effect of the present invention is verified.
将本发明测量段内孔为椭圆孔的传感器安装在测量管段的管体内，与现有技术的测量段内孔为正圆孔的传感器进行对比。通过流量检定标准装置测试，进行如下多个流量的检定：10L/h，16 L/h，25 L/h，32 L/h，50 L/h，80 L/h，120 L/h，160 L/h，320 L/h，450L/h，880 L/h，1300 L/h，2000 L/h，2500 L/h，4000 L/h，得到原始流量误差趋势，具体测试数据见附图8。A sensor with an elliptical hole in the measuring section of the present invention is installed in the body of the measuring pipe section, and compared with the sensor in the prior art with a perfect circular hole in the measuring section. Through the flow verification standard device test, the following flow rate verifications are carried out: 10L/h, 16 L/h, 25 L/h, 32 L/h, 50 L/h, 80 L/h, 120 L/h, 160 L/h L/h, 320 L/h, 450L/h, 880 L/h, 1300 L/h, 2000 L/h, 2500 L/h, 4000 L/h, get the original flow error trend, see the attached picture for
附图8为本发明椭圆孔测量段和现有技术的正圆孔测量段对比图；经过修正之前的原始流量误差曲线，需要对曲线进行多项式拟合，可以看出椭圆孔测量段所对应曲线的线性度要优于现有技术的正圆孔测量段，经过拟合修正后，精度要高于正圆孔测量段。Accompanying drawing 8 is the comparison diagram of the elliptical hole measurement section of the present invention and the perfect circular hole measurement section of the prior art; after the original flow error curve before correction, it is necessary to perform polynomial fitting on the curve, and it can be seen that the corresponding curve of the elliptical hole measurement section The linearity of the device is better than that of the perfect round hole measurement section in the prior art, and after fitting and correction, the accuracy is higher than that of the perfect round hole measurement section.
将本发明测量段内孔为椭圆孔的传感器安装在测量管段的管体内，与现有技术的测量段内孔为正圆孔的传感器进行对比。通过流量检定标准装置测试，流量设定为4m3/h，在表前不同直管段距离，如10D、5D、3D、0D，D为管径，设置水表标准中规定的漩涡扰流或者速度剖面型扰流，测试本发明与现有技术的抗扰流能力。具体测试数据见下表：A sensor with an elliptical hole in the measuring section of the present invention is installed in the tube body of the measuring pipe section, and compared with the sensor in the prior art with a perfect circular hole in the measuring section. Through the test of the flow verification standard device, the flow rate is set to 4m 3 /h, the distance of different straight pipe sections in front of the meter, such as 10D, 5D, 3D, 0D, D is the pipe diameter, and the vortex turbulence or velocity profile specified in the water meter standard is set Type turbulence to test the anti-turbulence capability of the present invention and the prior art. The specific test data are shown in the following table:
通过测试数据表明，本发明的椭圆孔测量段抗扰流性能优于现有技术的正圆孔，经过扰动试验后仍能达到1级精度要求，而现有技术的正圆孔仅能达到2级精度要求。The test data shows that the anti-turbulence performance of the measuring section of the elliptical hole of the present invention is better than that of the perfect circular hole in the prior art. level accuracy requirements.
本发明克服了本领域的技术偏见，具有结构新颖、低压力损失、组装工艺方便、抗扰流功能强，以及测量精度高等优点。The invention overcomes the technical prejudice in the field, and has the advantages of novel structure, low pressure loss, convenient assembly process, strong anti-turbulence function, and high measurement accuracy.
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Application publication date: 20200904 |