Today I will introduce to you a national invention authorized patent-anti-vibration plug-in thermal gas mass flow meter. The patent was applied by Harbin Peili Instrument and Meter Co., Ltd. and was authorized to be announced on May 11, 2018.
Description of contentThe invention belongs to the field of thermal gas mass flow monitoring, and particularly relates to a plug-in thermal gas mass flowmeter capable of resisting vibration.
Background of the inventionThermal gas mass flowmeter is an instrument that uses the principle of heat conduction to measure gas mass flow, which can achieve high-precision measurement of gas mass flow. The plug-in thermal gas mass flow meter can be an integrated structure or a split structure, and its sensor and metal probe are inserted into the measurement pipeline.
For flow measurement of large-section air ducts, plug-in thermal gas mass flow meters are generally used. Due to the large size of the air duct, the metal probe of the thermal gas mass flowmeter has a long insertion depth, and can only be fixed on the casing outside the air duct arm to form a cantilever structure. Therefore, under the action of wind, the metal probe will produce swaying vibration along the flow direction of the wind. The sensor probe moves along the vibration arc at the measurement point in the pipe, which will change the relative speed of the sensor and the airflow, which will affect the sensor. The measurement accuracy of the probe, and the vibration of the metal probe is easy to relax the mechanical seal structure of the installation position of the instrument and the air duct wall, and lose the sealing effect; and due to the complex application of the thermal gas mass flowmeter, the diameter and structure of the pipeline are not complete In line with the requirements of the theoretical model, the gas flow model is unstable. Even if the pipe diameter and structure meet the modeling requirements, the vibration of the probe is still different under different gas flow rates.
In order to solve the above problems, the currently known anti-vibration solution for sensor probes is instrument software compensation. According to the pipe diameter size and structure, the corresponding gas flow rate theoretical model is established, the probe rod vibration model, the probe rod vibration position is measured, and the instrument vibration is software make up. However, this method of software data processing is at the expense of increasing the response time of the instrument. The response time of the instrument is long and the cost is high. In summary, software compensation based on theoretical analysis does not solve all probe rod vibration problems.
Summary of the inventionThe purpose of the present invention is to solve the problem that the existing thermal gas mass flowmeter probe will produce oscillating vibration along the flow direction of the wind, thereby measuring accuracy. The invention aims to provide an anti-vibration plug-in thermal gas mass flowmeter which can effectively resist the vibration of the plug-in metal probe in the airflow direction, eliminate the impact of the airflow on the cantilever structure, and improve the measurement accuracy.
Figure is a schematic diagram of the structure of the present invention
An anti-vibration plug-in thermal gas mass flowmeter of the present invention includes an instrument transmitter, a probe rod and a measuring head, and the measuring head is connected to the instrument transmitter through the probe rod; Hanging section and fixed section, the fixed section is used to pass through the air duct wall to be installed and fixed, the suspended section is used to hang inside the air duct wall; the flange is connected to the end of the fixed section of the steel pipe to connect with the wind The outer wall of the tunnel wall is fixed, the probe rod passes through the flange and the steel pipe in sequence, and the measuring head protrudes from the end of the suspended section of the steel pipe; the locking structure is used to lock and fix the probe rod, the flange and the steel pipe.
Also includes: anti-shock structure, the anti-shock structure is arranged in the inner wall of the steel pipe, the anti-shock structure includes a pair of V-shaped shrapnel, the V-shaped shrapnel is symmetrically arranged in the inner wall of the steel pipe, the convex part of the V-shaped shrapnel and the elasticity of the probe rod penetrating the steel pipe contact. The anti-shock structure is arranged in the inner wall area near the end of the suspended section of the steel pipe. V-shaped shrapnel is made of metal material. The measuring head is used to convert the flow of the non-electrical information number into an electrical signal and transmit it to the instrument transmitter through the probe; the instrument transmitter is used to process the electrical signal to obtain the flow data and display the flow data.
The flange and the steel pipe are connected by welding, or the flange and the steel pipe have an integrated structure. The locking structure and the probe rod are connected in a threaded manner. The steel pipe is made of stainless steel metal material. The flange is made of stainless steel metal material.
The beneficial effect of the present invention is that the steel pipe is fixed on the air duct wall through a flange, so that the installation position of the plug-in thermal gas mass flow meter and the air duct wall is kept in a mechanically sealed state; the probe rod, The flange and steel pipe are locked and fixed on the wall of the air duct, which can effectively resist the vibration of the inserted probe in the direction of the air flow, eliminate the influence of the air flow on the probe, and ensure that the measuring head accurately measures the gas flow in the air channel. The sealing between the plug-in thermal gas mass flow meter and the air duct wall is improved, and the slack between the probe rod and the flange and the air duct wall is prevented. The invention has the advantages of simple structure, strong reliability, low cost and obvious anti-vibration effect.
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