Online detection device for measuring air speed and air volume in pipeline

Abstract

The utility model discloses an on-line detection device for measuring wind speed and wind quantity in a pipeline, which comprises a shell, a balance straightener, a pressure tapping pipe network and a transmitting component, the balance straightener and the pressure tapping pipe network are arranged in the shell, the balance straightener is positioned on the front side of the inner cavity of the shell, the pressure tapping pipe network is positioned behind the balance straightener and positioned in the middle of the inner cavity of the shell, and the transmitting component is positioned in the middle of the inner cavity of the shell. The transmitting assembly is connected with the pressure tapping pipe network and located outside the shell. The balance straightener is used for adjusting, straightening and uniformizing disturbed air flow, the flow is adjusted to be balanced and steady in a short process, the balance straightener has the same effect as a straight pipe section with enough length, and the problem that a long straight pipe cannot be arranged due to insufficient space is solved; multi-point total pressure and static pressure measuring points are arranged at different positions on the flow velocity section, the accuracy and stability of wind speed and wind quantity measurement are improved, accurate and stable data are further obtained and serve as control signals of an automatic control system, and the stability and operability of the control system can be enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to an online detection device for measuring wind speed and air volume in a pipeline. Background Art

[0002] The air volume detection in the existing ventilation and air conditioning system pipeline is basically the technical solution in CN207964002U, which first measures the average wind speed in the pipeline and then calculates it by the area method. The commonly used equipment in the above scheme includes single-point flow meters such as pitot tube pressure difference type and hot wire type, average speed pipeline flow meters that calculate the average flow velocity of the pipeline based on single-point flow velocity or single-line flow velocity, and cross-sectional pressure difference flow meters similar to those in VAV BOX. If the above wind speed and air volume detectors are to ensure the accuracy and stability of the measured values, then a sufficiently long straight pipe section must be guaranteed between the front and rear ends of the wind speed and air volume detectors so that the medium in the pipeline is a fully developed flow, so that the distribution of the medium flow field in the pipeline has a specific law, and then a measurement point representing the average flow velocity of the pipeline can be found. However, in the actual installation environment, it is difficult to have space to reserve a sufficiently long straight pipe section for the installation pipeline, which cannot meet the actual use requirements of the product, resulting in uneven distribution of the air flow in the pipeline, which has caused great difficulties in the accurate measurement of wind speed and air volume.

[0003] The ventilation and air conditioning automatic control system with wind speed and air volume as control variables must be based on real-time, accurate and stable wind speed and air volume data to avoid automatic control system oscillation and ensure safe and stable operation. Therefore, the existing wind speed and air volume detection meters and the actual installation environment are difficult to meet the accuracy and stability requirements of wind speed and air volume detection. The utility model provides an online detection device for measuring wind speed and air volume in a pipeline to solve the above problem. Utility Model Content

[0004] The utility model provides an online detection device for measuring wind speed and air volume in a pipeline, which uses a balanced straightener to adjust, straighten and evenly process the disturbed airflow to meet measurement requirements and improve measurement accuracy.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] An online detection device for measuring wind speed and air volume in a pipeline, comprising a shell, a balancing straightener, a pressure-taking pipe network and a transmitter assembly, wherein the front and rear openings of the shell are respectively an air inlet and an air outlet, and air flow enters from the air inlet, passes horizontally through the inner cavity of the shell, and flows out from the air outlet;

[0007] The equalizing straightener and the pressure-taking pipe network are arranged in the shell, the equalizing straightener is located at the front side of the inner cavity of the shell, the pressure-taking pipe network is located behind the equalizing straightener and in the middle of the inner cavity of the shell, and the transmitter assembly is connected to the pressure-taking pipe network and is located outside the shell;

[0008] The pressure-taking pipe network comprises a static pressure-taking pipe, a total pressure-taking pipe and a mounting bracket, and the static pressure-taking pipe and the total pressure-taking pipe are arranged on the mounting bracket at intervals.

[0009] Furthermore, the balancing straightener and the pressure-taking pipe network are parallel to each other front to back and perpendicular to the airflow direction, and the coverage areas of the balancing straightener and the pressure-taking pipe network are the same as the cross-sectional area of ​​the inner cavity of the shell.

[0010] Furthermore, the balancing straightener is provided with air straightening holes, the air straightening holes are densely arranged on the balancing straightener, and the air straightening holes are horizontally arranged along the front-to-back direction.

[0011] Furthermore, the mounting bracket is vertically arranged, and the static pressure taking pipe and the total pressure taking pipe are horizontally arranged on the mounting bracket along the left-right direction, and are both perpendicular to the airflow direction.

[0012] Furthermore, pressure exploration holes are arranged at intervals on the static pressure taking pipe and the total pressure taking pipe, and airflow pressure sensors are arranged at intervals in the static pressure taking pipe and the total pressure taking pipe.

[0013] Furthermore, the pressure-taking network is located 20-80 mm behind the equalizing straightener.

[0014] Furthermore, the flow area of ​​the air straightening holes on the balancing straightener accounts for no less than 96% of the total area of ​​the balancing straightener.

[0015] Furthermore, the transmitter assembly includes a signal interface and a transmitter, and the transmitter is connected to the pressure-taking network via the signal interface.

[0016] The beneficial effects of the utility model are as follows:

[0017] The balancing straightener is used to adjust, straighten and evenly process the turbulent, irregular and rotating disturbed airflow, and adjust it to a balanced and stable flow in a shorter process, which has the same effect as a straight pipe section of sufficient length, solving the problem of insufficient space to set up a long straight pipe.

[0018] By using the velocity area method, multiple total pressure and static pressure measuring points are set at different positions on the flow velocity section to improve the accuracy and stability of wind speed and air volume measurement, thereby obtaining accurate and stable data as the control signal of the automatic control system, which can enhance the stability and operability of the control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side view schematic diagram of the overall structure of the utility model;

[0020] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 3 It is a schematic diagram of the structural principle of the utility model.

[0022] Figure numerals: 1. Shell; 2. Balance straightener; 3. Pressure taking pipe network; 31. Static pressure taking pipe; 32. Full pressure taking pipe; 4. Transmitter assembly. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] like Figure 1 , 2As shown in Figures 3 and 4, the utility model utilizes a balancing straightener to achieve the condition that it is difficult to reserve a straight pipe section of sufficient length in the actual environment, meets the requirements of real-time, accurate and stable measurement of wind speed and air volume data in the system, and feeds this data back to the automatic control unit of the system to achieve homogeneous control of wind speed and air volume. A specific embodiment of the utility model for achieving the above-mentioned purpose is to arrange a balancing straightener 2 and a pressure-taking network 3 in parallel in the shell 1 in front and back. After the airflow enters the shell 1, it first passes through the balancing straightener 2, and the turbulent, irregular and rotating disturbed airflow is adjusted, straightened and evenly processed by the balancing straightener 2. The short-length balancing straightener 2 is adjusted to a balanced and stable flow. Then, the stable airflow is sent to the pressure-taking network 3 after passing a certain distance. The total pressure and static pressure values ​​of multiple points at different positions in the airflow are collected through the pressure probe holes on the static pressure taking pipe 31 and the total pressure taking pipe 32. Then, the accurate airflow total pressure and static pressure signals are detected and processed by the transmitter to obtain real-time wind speed and air volume values, which are transmitted to the centralized control system as output control signals to achieve automatic control requirements. At the same time, the above data can also be directly output and displayed.

[0026] This embodiment is based on the principle of the velocity area method. The velocity area method is to divide the cross section of the flow velocity into N small units, measure the flow velocity of each small unit, and then the total flow is the sum of the flow through each small unit. Therefore, when this method is adopted, the more small unit areas are divided, the more accurate the measured flow will be. Therefore, the airflow is adjusted to a steady flow by using the balanced straightener 2, and then divided into a sufficient number of small unit areas, and then according to the "logarithmic-Chebyshev integration method", multiple measuring point positions are formed on the static pressure taking pipe 31 and the total pressure taking pipe 32 of the pressure taking pipe network 3, which correspond to and cooperate with the balanced straightener 2 on the front side, and the working principle of the multi-point automatic balanced pitot tube is used to realize real-time detection of the total pressure and static pressure of the airflow. Finally, the measured total pressure and static pressure are calculated and converted into wind speed and air volume value display by the intelligent transmitter, and the corresponding control signal is output.

[0027] like Figure 1 , 2 As shown in Figure 3, an online detection device for measuring wind speed and volume in a pipeline includes a shell 1, a balancing straightener 2, a pressure-taking pipe network 3 and a transmitter assembly 4. The front and rear sides of the shell 1 are opened, which are an air inlet and an air outlet respectively. The airflow enters from the air inlet, passes horizontally through the inner cavity of the shell 1, and flows out from the air outlet. The balancing straightener 2 and the pressure-taking pipe network 3 are arranged in the shell 1, the balancing straightener 2 is located at the front side of the inner cavity of the shell 1, the pressure-taking pipe network 3 is located behind the balancing straightener 2 and in the middle of the inner cavity of the shell 1, and the transmitter assembly 4 is connected to the pressure-taking pipe network 3 and is located outside the shell 1.

[0028] like Figure 2As shown, the pressure taking pipe network 3 includes a static pressure taking pipe 31, a total pressure taking pipe 32 and a mounting bracket, and the static pressure taking pipe 31 and the total pressure taking pipe 32 are arranged on the mounting bracket at intervals.

[0029] Furthermore, the balancing straightener 2 and the pressure-taking network 3 are parallel to each other front to back and are perpendicular to the airflow direction. The coverage areas of the balancing straightener 2 and the pressure-taking network 3 are the same as the cross-sectional area of ​​the inner cavity of the shell 1. The balancing straightener 2 is filled in the inner cavity of the shell 1, covering the entire cross-section of the inner cavity of the shell 1, and all airflows passing through the inner cavity of the shell 1 are adjusted, straightened, and evenly processed to form a steady flow in the front-to-back direction, and then vertically pass through the pressure-taking network 3 covering the inner cavity of the shell 1, and the steady flow data is collected through the pressure-taking network 3.

[0030] Furthermore, the balancing straightener 2 is provided with air straightening holes, and the air straightening holes are densely arranged on the balancing straightener 2, and the air straightening holes are horizontally arranged along the front-to-back direction; the flow area of ​​the air straightening holes on the balancing straightener 2 accounts for no less than 96% of the total area of ​​the balancing straightener 2, and the pressure loss of the airflow is small after passing through the balancing straightener 2, which does not affect the measurement results.

[0031] Preferably, the balancing straightener 2 is a wind tunnel honeycomb or an airflow straightener, and the air straightening holes are in a hexagonal honeycomb shape.

[0032] Furthermore, the mounting bracket is vertically arranged, and the static pressure taking pipe 31 and the total pressure taking pipe 32 are horizontally arranged on the mounting bracket along the left and right directions, and are both arranged perpendicularly to the airflow direction. The steady flow passing through the balancing straightener 2 vertically passes through the static pressure taking pipe 31 and the total pressure taking pipe 32, and the data of the steady flow is collected.

[0033] Furthermore, pressure exploration holes are arranged at intervals on the static pressure taking tube 31 and the total pressure taking tube 32, and airflow pressure sensors are arranged at intervals in the static pressure taking tube 31 and the total pressure taking tube 32 for collecting the pressure values ​​of the airflow at different points, and then calculating the total pressure value and the static pressure value according to the collected multi-point pressure parameters and the calculation method of the total pressure and the static pressure.

[0034] Furthermore, the number and uniqueness of the airflow pressure sensors are determined according to the cross-sectional size of the air duct.

[0035] Furthermore, the pressure-taking pipe network 3 is located 20-80 mm behind the equalizing straightener 2 , and the specific distance between the two is determined according to various parameters of the equalizing straightener 2 and the pressure-taking pipe network 3 .

[0036] Furthermore, the transmitter assembly 4 includes a total pressure and static pressure signal interface and an intelligent transmitter, and the intelligent transmitter is connected to the pressure sampling network 3 via the total pressure and static pressure signal interface.

[0037] Preferably, the material of the balancing straightener 2 is aluminum.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. An online detection device for measuring wind speed and air volume in a pipeline, characterized in that: It comprises a shell (1), a balancing straightener (2), a pressure-taking pipe network (3) and a transmitter assembly (4), wherein the shell (1) has openings on the front and rear sides, which are respectively an air inlet and an air outlet, and air flows in through the air inlet, passes horizontally through the inner cavity of the shell (1), and flows out through the air outlet; The equalizing straightener (2) and the pressure-taking pipe network (3) are arranged in the housing (1); the equalizing straightener (2) is located at the front side of the inner cavity of the housing (1); the pressure-taking pipe network (3) is located behind the equalizing straightener (2) and in the middle of the inner cavity of the housing (1); the transmitter assembly (4) is connected to the pressure-taking pipe network (3) and is located outside the housing (1); The pressure-taking pipe network (3) comprises a static pressure-taking pipe (31), a total pressure-taking pipe (32) and a mounting bracket, wherein the static pressure-taking pipe (31) and the total pressure-taking pipe (32) are arranged on the mounting bracket at intervals.

2. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: The balancing straightener (2) and the pressure-taking pipe network (3) are parallel to each other front to back and perpendicular to the airflow direction; the coverage areas of the balancing straightener (2) and the pressure-taking pipe network (3) are the same as the cross-sectional area of ​​the inner cavity of the shell (1).

3. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: The balancing straightener (2) is provided with air straightening holes, the air straightening holes are densely arranged on the balancing straightener (2), and the air straightening holes are arranged horizontally along the front-rear direction.

4. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: The mounting bracket is arranged vertically, and the static pressure taking pipe (31) and the total pressure taking pipe (32) are arranged horizontally on the mounting bracket in the left-right direction and are both perpendicular to the airflow direction.

5. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: Pressure exploration holes are arranged at intervals on the static pressure taking pipe (31) and the total pressure taking pipe (32), and airflow pressure sensors are arranged at intervals in the static pressure taking pipe (31) and the total pressure taking pipe (32).

6. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: The pressure-taking pipe network (3) is located 20-80 mm behind the equalizing straightener (2).

7. The online detection device for measuring wind speed and air volume in a pipeline according to claim 3 is characterized in that: The flow area of ​​the air straightening holes on the balancing straightener (2) accounts for no less than 96% of the total area of ​​the balancing straightener (2).

8. The online detection device for measuring wind speed and air volume in a pipeline according to claim 1 is characterized in that: The transmitter assembly (4) comprises a signal interface and a transmitter, and the transmitter is connected to the pressure-taking pipe network (3) via the signal interface.

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