CN204988382U - Amount of wind measuring transducer - Google Patents

Abstract

The utility model discloses an air volume measurement sensor, which aims at providing an air volume measurement sensor which prevents blockage and has a wide application range. Positive and negative pressure-taking tubes on the shell; pressure-measuring probes are installed at the outlets of the positive and negative pressure-taking tubes, and anti-blocking devices are installed in the positive and negative pressure-taking tubes to prevent clogging The device includes a rotating shaft arranged at the outlet end of the pressure-taking tube, and an anti-blocking chain connected to the rotating shaft in the pressure-taking tube; the air volume measurement sensor of the utility model can not only effectively avoid the pressure-taking tube being blocked by dust impurities, but also Keep the pressure pipe unobstructed, and do not need to make the size of the housing of the air flow sensor to be the same as the size of the pipe that needs to be measured for air flow, which greatly reduces the cost of air flow measurement, expands the scope of application, and has high promotion value.

Description

A sensor for air flow measurement

technical field

The utility model relates to the field of measuring instruments, in particular to an air volume measuring sensor.

Background technique

At present, there are many types of instruments for measuring air flow, such as: winged type, Venturi, Pitot tube, equal velocity tube, cone flow meter, etc.; The flow piece then measures the air volume; for a stable fluid, the square root of the differential pressure value generated by the throttle piece is proportional to the gas flow rate, which conforms to the Bernoulli equation, and the differential pressure signal generated by the throttle piece is converted into gas by the instrument Velocity, flow signal.

In the patent application number: 201220708979.4, a V-cone flow sensor is disclosed. The sensor includes a flange, a pressure probe, a positive pressure tube, a negative pressure tube, a V-cone and a shell. The two ends of the shell are respectively connected to the flange. The positive pressure tube and the negative pressure tube are installed on the outer wall of the housing. The bottom of the positive pressure tube is connected to the V cone, and the V cone is located in the housing. The positive pressure tube and the negative pressure tube are compressed and fixed by the compression nut. The V-cone flow sensor is formed as a whole; when in use, the fluid passes through the V-cone to generate a differential pressure, and the pressure in the positive pressure tube and the negative pressure tube are respectively measured by two high-precision pressure probes; the pressure difference is measured by two high-precision pressure probes, positive and negative Accurate pressure measurement and high measurement accuracy. This V-cone flow sensor not only has good stability, high accuracy, good repeatability, and wide range ratio, but also has low requirements for installation pipelines and small pressure loss. It can measure the flow of liquid and gas media with a very large range; however In use, it is found that the outer tube of this traditional V-cone sensor is a part of the process pipeline. When connecting with the process pipeline, methods such as flange connection, butt welding, clamping, etc. are required, which is very inconvenient to install. Reliability and stability are poor; and this V-cone sensor and other gas flow sensors do not have the function of preventing dust impurities from clogging.

When coal-fired boilers in thermal power plants are running, a large amount of impurities such as flue gas will be produced; because the measured medium will contain impurities of different concentrations of dust, when measuring, the pressure port of the throttling sensor that measures the flow rate or even the pressure The pipe will be seriously blocked, causing the sensor to measure inaccurately or fail to work; when the pressure-taking port or the pressure-taking pipe of the air volume sensor is blocked by impurities, there are two conventional solutions: one is to disconnect the sensor from the instrument during operation , using compressed air to blow the pressure pipe, and the second is to use mechanical tools to clear it; no matter which solution needs to interrupt the air volume measurement and consume manpower, it also needs to be equipped with a special online blowing device, such as: equipped with a special blowing Equipment and compressed air source, this will inevitably increase the cost of the air volume measurement system and reduce the reliability of the system. In summary, the traditional air volume measurement sensor can no longer meet the measurement needs.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides an air flow measurement sensor which prevents blockage and has a wide range of applications.

The technical solution of the utility model is: an air volume measurement sensor, including a housing, a V cone fixed in the housing, a positive pressure-taking tube and a negative pressure-taking tube that are vertically inserted and fixedly arranged on the housing; Pressure measuring probes are arranged at the outlet ends of the positive pressure taking pipe and the negative pressure taking pipe, and anti-blockage devices are arranged in the positive pressure taking pipe and the negative pressure taking pipe. The rotating shaft at the outlet end in the pressure pipe and the negative pressure pipe is arranged in the anti-blocking chain connected with the rotating shaft in the positive pressure pipe and the negative pressure pipe.

As a preferred technical solution of the present invention, the housing is in the shape of a hollow cylinder; the V cone is fixed inside the housing by a cone fixing member.

As a preferred technical solution of the present invention, an anti-blocking rod is connected to the end of the anti-blocking chain.

Due to the adoption of the above technical scheme, the air flow measurement sensor includes a housing, a V cone fixed in the housing, a positive pressure-taking tube and a negative pressure-taking tube that are vertically inserted and fixed on the housing; Pressure measuring probes are installed at the outlet ends of the pressure taking pipes, and anti-blocking devices are installed in the positive and negative pressure taking pipes. An anti-clogging chain connected with the rotating shaft; the beneficial effect of the utility model is that an anti-clogging device is provided in both the positive pressure-taking pipe and the negative pressure-taking pipe. The swinging of the blocking rod and the anti-clogging chain can scrape off or shake off the attached impurities in the positive and negative pressure-taking pipes while swinging, and then be blown away by the airflow, so as to realize the automatic dredging of the pressure-taking pipes, effectively It avoids the pressure taking tube being blocked by dust and impurities, keeps the pressure taking tube unobstructed, and realizes the anti-blocking function of the pressure taking tube; moreover, the positive and negative pressure taking tubes in the utility model are inserted vertically and fixed on the On the shell, the device can be directly installed inside the pipeline that needs to be measured for air volume, and the positive and negative pressure tubes extend to the outside of the pipeline to obtain differential pressure signals, without the need to make the size of the air volume sensor housing to be measured. The measured pipes have the same size, which greatly reduces the cost of air flow measurement, expands the application range, and has high promotion value.

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 accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative work, wherein:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is a structural representation of the utility model in application;

In the figure: 1. shell; 2. V cone; 3. positive pressure tube; 4. negative pressure tube; 5. pressure probe; 6. rotating shaft; 7. anti-blocking chain; 8. anti-blocking rod; 9. Cone fixture.

detailed description

Below in conjunction with accompanying drawing and embodiment, further set forth the utility model. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, those skilled in the art would realize that the described embodiments may be modified in various different ways, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

As shown in Figure 1 and Figure 2, an air volume measurement sensor includes a housing 1, a V-cone 2 fixed in the housing 1, a positive pressure-taking tube 3 inserted vertically and fixed on the housing 1, a negative Pressure-taking tube 4; As a preferred embodiment of the present utility model, the housing 1 is in the shape of a hollow cylinder; obviously the shape of the housing 1 can also be other shapes, such as: a hollow cuboid or the like, which can be used in practice The shape of the housing 1 can be flexibly adjusted as required. In the embodiment of the utility model, preferably, the V cone 2 is fixed inside the housing 1 through the cone fixing part 9, and the connection mode between the cone fixing part 9 and the V cone 2 is a fixed connection, such as: welding, cementing and more.

Pressure measuring probes 5 are arranged at the outlet ends of the positive pressure taking pipe 3 and the negative pressure taking pipe 4, and anti-clogging devices are arranged in the positive pressure taking pipe 3 and the negative pressure taking pipe 4. In the pipe 3, the rotating shaft 6 at the outlet end in the negative pressure-taking pipe 4 is arranged on the anti-clogging chain 7 connected with the rotating shaft 6 in the pressure-taking pipe.

Further, the end of the anti-clogging chain 7 is also connected with an anti-jamming rod 8. The preferred anti-jamming chain 7 and the anti-jamming rod 8 in the embodiment of the utility model are all made of stainless steel, and the anti-jamming chain 7 and the anti-jamming rod The rods 8 are located at the center of the positive pressure pipe 3 and the negative pressure pipe 4, and the tail end of the anti-clogging rod 8 protrudes about 5 mm from the inlets of the positive pressure pipe 3 and the negative pressure pipe 4; , in the embodiment of the utility model, the direction indicated by the arrow is the medium flow direction or the airflow direction. Due to the force of the airflow and the vibration of the pipeline, the anti-clogging rod 8 and the anti-jamming chain 7 will swing. Scrape off or shake off the attached impurities in the positive pressure tube 3 and the negative pressure tube 4, and then be blown away by the air flow, so as to realize the automatic dredging of the positive pressure tube 3 and the negative pressure tube 4, effectively avoiding the positive pressure The pipe 3 and the negative pressure pipe 4 are blocked by dust and impurities, and the positive pressure pipe 3 and the negative pressure pipe 4 can always be kept unobstructed, realizing the anti-blocking function.

In this utility model, the negative pressure-taking tube 4 does not need to pass through the V cone 2, but is inserted vertically along the axis of the shell 1 and fixed on the shell 1, and the pressure-taking port is located in the back pressure area of the pressure measuring probe 5 , it is convenient to install an anti-blocking device in the positive pressure pipe 3 and the negative pressure pipe 4, and the air volume measurement sensor of the utility model can be directly installed inside the pipe that needs to measure the air volume, and the pressure pipe extends to the outside of the pipe to obtain a differential pressure signal , it is not necessary to manufacture the size of the housing 1 to be the same as the size of the pipe that needs to measure the air volume, which reduces the cost of the air volume measurement and expands the application range of the air volume measurement sensor, meets the needs of the air volume measurement, and has a high Promote value.

The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model The new model also has various changes and improvements, and these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (3)

1. An air flow measurement sensor, characterized in that: comprising a housing (1), a V cone (2) fixed in the housing (1), vertically inserted and fixedly arranged in the housing (1) The positive pressure-taking tube (3) and the negative pressure-taking tube (4) on the top; pressure-measuring probes (5) are arranged at the outlet ends of the positive pressure-taking tube (3) and the negative pressure-taking tube (4). Anti-clogging devices are provided in the positive pressure-taking pipe (3) and the negative pressure-taking pipe (4), and the anti-clogging devices include The rotating shaft (6) at the outlet end is arranged in the positive pressure-taking pipe (3) and the anti-clogging chain (7) connected with the rotating shaft (6) in the negative pressure-taking pipe (4). 2. An air flow measuring sensor according to claim 1, characterized in that: the housing (1) is in the shape of a hollow cylinder; the V cone (2) is fixed on the The interior of the housing (1). 3. An air flow measuring sensor according to claim 1, characterized in that: an anti-clogging rod (8) is connected to the end of the anti-clogging chain (7).