Abstract: a kind of ultrasonic heat meter beam pipe design and implementation of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1. 1 ultrasonic heat meter measuring principle of ultrasonic heat meter consists of three parts: pairing ultrasonic flow sensor, temperature sensor and a calculator. As shown in figure 1. Figure 1 ultrasonic heat meter composition block diagram of ultrasonic heat meter is on the basis of ultrasonic flowmeter. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a kind of ultrasonic heat meter beam pipe design and implementation of an article for details. 1. 1 ultrasonic heat meter measuring principle of ultrasonic heat meter consists of three parts: pairing ultrasonic flow sensor, temperature sensor and a calculator. As shown in figure 1. Figure 1 ultrasonic heat meter composition block diagram of ultrasonic heat meter is on the basis of the ultrasonic flowmeter with temperature measurement, the fluid flow and to calculate the supply and return water temperature difference of heat to users. The flow measurement part is the application of a pair of ultrasonic transducer two-way alternate ( Or at the same time) Sending and receiving of ultrasonic, by observing the ultrasonic transmission time downstream and upstream in the medium to indirectly measure the fluid velocity, by an indirect method for measuring flow rate to calculate the flow. 1. 2 system this paper designed a ultrasonic heat meter beam pipe fittings, installed in the ultrasonic heat meter pipe, described in the beam pipe fittings for cylindrical pipe, through the positioning lock screw on the ultrasonic heat meter with the pipe on the central axis of the beam pipe diameter less than the diameter of ultrasonic heat meter, as shown in figure 2. Figure 2 whole structure diagram 1. Three key technologies of ultrasonic sensor measuring principle is the premise of the liquid in the pipe flow field to be evenly distributed, every point on the pipe cross section, the velocity is the same, and this is only an ideal condition. Found in practical application, cannot achieve uniform distribution, the flow field velocity distribution of flow field with not only the shape of the velocity, the thickness of pipe, pipe, pipe surface roughness, and even the density of the liquid in the pipe, the condition such as the movement of the liquid viscosity, which affect measurement accuracy. Beam pipe fittings pipe inner surface roughness Ra is less than 1. 6μ Arithmetic average deviation is less than 1 m, i. e. , contour. 6μ m。 Fixed with two beam pipe of the pipe and pipe wall & 45 deg. Angle of the mirror, and 2 mirror mirror is relative and the parallel set. Compared with the existing technology, the utility model is beneficial effects: the beam pipe adjustment of flow field, the flow through ultrasonic heat meter heat transfer liquid artificially accelerated, large measure speed and small flow can be converted to improve the uniform distribution of flow field, ensure the accuracy of the heat meter measurement. By improving the beam pipe fittings pipe wall roughness, decreased to improve the ultrasonic heat meter pipe inner surface roughness and machining difficulty, in reducing costs and reduce the difficulty at the same time, improve the measurement precision of the ultrasonic heat meter. Through 45 & deg; Fixed on the beam pipe fittings pipe axis Angle of mirror, reflected the launch of the signal transmission ultrasonic sensors, effective signal attenuation not easily, improve the service life of the products. Compared with the reflection type 2 as shown in figure 3, without installing a beam pipe fittings, using ultrasonic sensors to measure the wall reflection of base table, ultrasonic sensor signal is usually based on the inner wall of the pipe section after launching its own mirror, and only one reflection point, after a reflection refraction, signal is accepted by the ultrasonic sensor, the other to complete a process of signal transmission. But according to the principle of fluid study, the fluid flow in the pipe with the section points of different, the flow velocity is also different, one on the central axis, zui fast near the pipe wall velocity, the slower the pipe wall velocity is zero, it's easy to scale formation on pipe wall, crystallization, such accumulate over a long period led to effective signal fading, which rely on the wall itself do signal mirror product service life is shorter. Figure 3 ultrasonic heat meter installed in the pipeline beam pipe diagram of the three implementation steps in figure 4 and the specific installation this ultrasonic heat meter beam pipe fittings for further details. 1 ultrasonic heat meter; 2 beam pipe fittings; 3 positioning lock screw; 4 mirror; 5 ultrasonic sensors. Figure 4 beam pipe installation schematic diagram of ultrasonic heat meter beam pipe 2 for cylindrical pipes, fixed beam pipe 2 of the pipe has 2 and pipeline wall & 45 deg. Angle of the mirror. 4, 2 a mirror mirror relative and non parallel set 4, in the area of the beam pipe 2 increase reflector within 4, improve the measuring precision of ultrasonic heat meter 1. Beam pipe through the positioning lock screw 2 3 on the ultrasonic heat meter with 1 on the centerline of the pipe, and then makes an image by 4 axis in the pipe. Beam pipe diameter for 2 D, ultrasonic heat meter diameter D, heat transfer fluid flows through the pipe diameter smaller, the flow through the heat transfer of ultrasonic heat meter 1 liquid artificial accelerated, large measure speed and small flow can be converted to improve the uniform distribution of flow field. Beam pipe wall of pipeline caused by surface roughness Ra is less than 1 of 2. 6μ Arithmetic average deviation is less than 1 m, i. e. , contour. 6μ M, by improving the beam pipe wall roughness, 2 can effectively improve the measurement precision of the ultrasonic heat meter 1.
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