CN103674142A - Coriolis mass flowmeter sensor and flow distributer device thereof - Google Patents

Abstract

The invention discloses a Coriolis mass flowmeter sensor and a flow distributer device of the Coriolis mass flowmeter sensor. The flow distributer device comprises two flow distributer bodies. Each flow distributer body is provided with a locating groove which is used for locating an upper shell of the sensor so that the upper shell of the sensor can be welded after being located to the flow distributer bodies through the locating grooves. In this way, the flow distributer device of the Coriolis mass flowmeter sensor can solve the problem that position deviation is prone to occurrence in the process of welding the flow distributer bodies and the upper shell.

Description

Coriolis mass flowmeter sensor and its flow divider device

technical field

The invention relates to the technical field of sensors, in particular to a Coriolis mass flowmeter sensor and a flow divider device thereof.

Background technique

Coriolis mass flowmeter, referred to as Coriolis mass flowmeter, is a kind of instrument that directly measures the mass flow rate by using the principle of Coriolis force proportional to the mass flow rate generated by the fluid flowing in the vibrating tube. It is directly used to measure the mass flow, density and temperature of the medium. It has the characteristics of high measurement accuracy, wide range ratio, good stability and low maintenance, and has been widely used in the petrochemical industry.

The mass flowmeter is composed of three parts: sensor, transmitter and digital indicating accumulator. The sensor of Coriolis mass flowmeter is made according to the Coriolis effect, including measuring tube, electromagnetic driver, electromagnetic detector, shunt, etc. part. The electromagnetic driver makes the measuring tube vibrate at its natural frequency, and the introduction of the flow causes the U-shaped measuring tube to produce a distortion under the action of Coriolis force, and a phase difference is generated on its left and right sides, according to the Coriolis effect , the phase difference is proportional to the mass flow rate. The electromagnetic detector converts the phase difference into a corresponding level signal and sends it to the transmitter. After filtering, integration, amplification and other power processing, it is converted into an analog signal proportional to the quality and a frequency signal within a certain range. Output .

The measuring principle of the mass flowmeter is based on Newton's second law of motion

F=ma

In the formula, F—fluid force; m—measured medium quality; a—acceleration.

When the fluid passes through two parallel measuring tubes, an acceleration transverse to the flow velocity direction and the corresponding Coriolis force will be generated, which will cause the measuring tube to oscillate and twist. This distortion phenomenon is called Coriolis profit phenomenon.

According to Newton's second law of motion, the amount of distortion of the measuring tube is completely proportional to the mass flow through the measuring tube. When the fluid flows through the measuring tube, the fluid will be affected by the Coriolis force, and the reaction of the Coriolis force on the fluid in the measuring tube will generate a phase difference between the inlet and the outlet. When the fluid is zero, the measuring tube vibrates at the natural frequency, the measuring tube does not produce distortion, and the phase difference between the fluid inlet and outlet is zero. When fluid flows through the measuring tube, the vibration of the tube at the inlet decelerates, and the vibration of the tube at the outlet accelerates, and a phase difference occurs between the inlet and the outlet. When the mass flow rate increases, the phase difference also increases. It is detected by electromagnetic signals installed on the inlet and outlet measuring tubes. The device can measure the phase difference.

The mass flow sensor in the prior art includes two flow dividers, and the two flow dividers are welded together with the upper housing and the support rod of the sensor respectively. However, during the welding process, the flow divider and the upper housing are not easy to locate, Welding is prone to deviations that can affect sensor performance.

Therefore, how to solve the problem in the prior art that the welding of the shunt and the upper casing is prone to position deviation has become an important technical problem to be solved by those skilled in the art.

Contents of the invention

The invention provides a flow diverter device of a Coriolis mass flowmeter sensor, which can solve the problem that the position deviation easily occurs during the welding process of the flow divider and the upper casing. The present invention also provides a Coriolis mass flowmeter sensor comprising the flow divider device.

A flow divider device for a Coriolis mass flowmeter sensor provided by the present invention includes two flow divider main bodies, and the flow divider main body is provided with a positioning groove for positioning the upper casing of the sensor, so that the upper casing passes through After the positioning groove is positioned on the main body of the diverter, welding is performed.

In this way, before welding the main body of the shunt and the upper case, the upper case can be positioned in the positioning groove of the main body of the shunt first, and then welded, so that the welding process of the main body of the shunt and the upper case are avoided The problem of misalignment of the shell ensures the performance of the sensor.

The present invention also provides a Coriolis mass flowmeter sensor, including the above-mentioned flow divider device. With such an arrangement, the Coriolis mass flowmeter provided by the present invention avoids the problem of misalignment between the main body of the shunt and the upper casing during the welding process, and ensures the performance of the sensor.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of a flow divider device of a Coriolis mass flowmeter sensor in a specific embodiment of the present invention;

In Figure 1:

Diverter main body—11, upper housing—12, positioning groove—13.

Detailed ways

This specific embodiment provides a shunt device for a Coriolis mass flowmeter sensor, which can solve the problem of easy position deviation during the welding process of the shunt and the upper shell. The specific embodiment also provides a Coriolis mass flowmeter sensor comprising the above-mentioned flow divider device.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , a flow divider device for a Coriolis mass flowmeter sensor provided in this specific embodiment includes two flow divider main bodies 11, and the flow divider main body 11 is provided with a positioning groove 13 for positioning the upper housing 12 of the sensor , so that the upper casing 12 is positioned on the shunt main body 11 through the positioning groove 13 before welding.

In this way, before welding the shunt main body 11 and the upper casing 12, the upper casing 12 can be positioned in the positioning groove 13 of the shunt main body 11 first, and then welded, thus avoiding the welding process, The misalignment between the shunt main body 11 and the upper casing 12 ensures the performance of the sensor.

This specific embodiment also provides a Coriolis mass flowmeter sensor, including the above-mentioned flow divider device. With such arrangement, the Coriolis mass flowmeter provided in this specific embodiment avoids the problem of misalignment between the main body of the shunt and the upper casing during the welding process, and ensures the performance of the sensor.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (2)

1. A flow divider device of a Coriolis mass flowmeter sensor, comprising two flow divider main bodies, characterized in that the flow divider main body is provided with a positioning groove for positioning the upper casing of the sensor, so that the upper casing After the body is positioned on the main body of the shunt through the positioning groove, welding is performed. 2. A Coriolis mass flowmeter sensor, characterized in that it comprises the flow divider device as claimed in claim 1.