Device for measuring air flow in pipeline

Abstract

A device for measuring air flow in a pipeline comprises a pressure tapping pipe, a mounting seat and a pressure sensor. The device further comprises an ash removal rod, and the ash removal rod is of a flexible rod-shaped structure. An ash removal rod is hung in the pressure tapping pipe, and the included angle between the axis of the pressure tapping pipe located at the installation position and the horizontal plane ranges from 65 degrees to 90 degrees. According to the utility model, the ash removal rod is additionally arranged in the pressure tapping pipe, can move irregularly under the disturbance of airflow, and further touches the inner wall of the pipe to scrape ash so as to complete the ash removal operation of the pressure tapping pipe, so that the manual maintenance frequency can be reduced, the interior of the pipe is kept clean for a long time, the measurement accuracy is improved, and the system efficiency is comprehensively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of measurement, in particular to a device for measuring wind flow in a pipeline. Background Art

[0002] In many existing gas supply systems, air volume measurement devices are generally installed to accurately control the air supply volume. For example: in a thermal power unit, the measurement results of the primary and secondary air volume measurement devices are related to the parameter setting of the air volume automatic control loop. If there is a large measurement error or equipment failure, it will lead to a low automatic air volume input rate, which will increase the workload of the operating personnel and reduce the boiler combustion efficiency.

[0003] Therefore, it is necessary to focus on the design of air volume measurement devices, so as to make them have the characteristics of long service life, good maintainability, good stability and accurate measurement.

[0004] In the prior art, it is usually designed to process an opening on the air supply duct and install an air volume meter. The common air volume meter adopts a backrest structure. Based on the backrest measurement principle, its pressure pipe is inserted into the air supply duct. When there is airflow flowing in the pipe, the windward side is impacted by the airflow, and the kinetic energy of the airflow is converted into pressure energy here. Therefore, the pressure in the frontal pipe is higher, and its pressure is called "total pressure". Since the leeward side is not impacted by the airflow, the pressure in its pipe is the static pressure in the air duct, and its pressure is called "static pressure". The difference between the total pressure and the static pressure is called differential pressure, and its size is related to the wind speed in the pipe. The greater the wind speed, the greater the differential pressure; the smaller the wind speed, the smaller the differential pressure. Therefore, as long as the size of the differential pressure is measured, and then the corresponding relationship between the differential pressure and the wind speed is found, the air volume in the pipe can be correctly measured in combination with the pipe size.

[0005] Although the existing back-type pressure-taking pipe design is not easy to be clogged, and the cyclone dust removal structure can reduce the clogging of the pressure-taking pipe, clogging problems still occur frequently in gas transportation environments containing a large amount of dust, resulting in frequent maintenance by operators or system failures, affecting overall efficiency.

[0006] In summary, it is still necessary to improve the existing in-duct air flow measurement device. Without significantly increasing the complexity and cost of the device, the blockage problem caused by dust accumulation can be effectively reduced and the measurement accuracy can be improved. Utility Model Content

[0007] The utility model provides a device for measuring wind flow in a pipeline to solve the above problem.

[0008] The utility model adopts the following technical solutions to solve the above technical problems:

[0009] The utility model provides a device for measuring wind flow in a pipeline, the main body of the device is a backrest type wind flow meter, which includes a pressure taking pipe, a mounting seat and a pressure sensor;

[0010] It also includes a cleaning rod, which is a flexible rod-shaped structure;

[0011] At least one of the cleaning rods is suspended in at least one of the pressure-taking pipes, and the angle between the axis of the pressure-taking pipe and the horizontal plane when the pressure-taking pipe is in the installation position is in the range of 65°-90°.

[0012] Optionally, the length of the cleaning rod is less than or equal to the length of the pressure taking pipe.

[0013] Optionally, each of the pressure-taking pipes is equipped with a dust-cleaning rod;

[0014] The dust cleaning rod is coaxially arranged with the pressure taking pipe.

[0015] Optionally, the ratio of the maximum cross-sectional dimension of the cleaning rod to the inner diameter of the pressure taking pipe is in the range of 7%-15%.

[0016] Optionally, the cleaning rod is of cylindrical structure.

[0017] Optionally, the surface of the cleaning rod is provided with convex parts, and the convex parts are distributed on the surface of the rod body in a point shape or a spiral shape.

[0018] Optionally, a plurality of ridges are provided on the surface of the cleaning rod, the ridges are evenly distributed along the circumference of the rod body, and the long sides of the ridges are parallel to the axial direction of the rod body.

[0019] Optionally, the cross section of the cleaning rod is a polygon;

[0020] The rod body of the cleaning rod is in a twisted structure along the axis.

[0021] Optionally, a counterweight block is provided at the end of the cleaning rod.

[0022] Optionally, a metal wire is provided inside the cleaning rod;

[0023] The upper end of the metal wire is directly or indirectly fixedly connected to the mounting seat, and the lower end of the metal wire is fixedly connected to the counterweight block.

[0024] Compared with the prior art, the utility model adopts the above technical solution and has the following technical effects:

[0025] The utility model adds a cleaning rod in the pressure taking pipe, which can perform irregular movement under the disturbance of airflow, and then contact and scrape the dust with the inner wall of the pipe to complete the pressure taking pipe cleaning operation. The frequency of manual maintenance can be reduced, and the inside of the pipe can be kept clean for a long time. It can also be used to improve measurement accuracy and comprehensively improve system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 This is the front view of Embodiment 1 of the utility model;

[0028] Figure 2 It is an upper side view of Embodiment 1 of the utility model;

[0029] Figure 3 This is a lower side view of Embodiment 1 of the utility model;

[0030] Figure 4 This is a cross-sectional view of the installation position of the counterweight block of Example 2 of the utility model;

[0031] Figure 5 This is a cross-sectional view of the connection between the metal wire and the counterweight block in Embodiment 2 of the utility model;

[0032] Figure 6 This is a three-dimensional diagram of the dust cleaning rod in Example 3 of the utility model;

[0033] Figure 7 This is a three-dimensional diagram of the dust cleaning rod in Embodiment 4 of the present utility model;

[0034] Figure 8 This is a three-dimensional diagram of the dust cleaning rod in Embodiment 5 of the present utility model;

[0035] Fig. 9 This is a three-dimensional diagram of the dust cleaning rod in Example 6 of the utility model;

[0036] Fig.10 This is a three-dimensional diagram of the dust cleaning rod in Example 7 of the utility model;

[0037] Fig.11 This is a three-dimensional diagram of the dust cleaning rod in Example 8 of the utility model;

[0038] Fig.12 It is a three-dimensional diagram of the cleaning rod in Example 9 of the utility model.

[0039] In the figure: 1. pressure taking pipe, 2. mounting base, 3. sensor, 4. quick connector, 101. full pressure pipe, 102. static pressure pipe, 103. cleaning rod, 1031. rod body, 1032. counterweight, 1033. metal wire, 1034. convex part, 1035. convex ridge. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it is necessary to understand that the relative relationships indicated by the terms "upper" and "lower" are based on the order of contact with the material in the rotation direction in actual applications. They are for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of the present invention, "plurality" means two or more than two, unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] It should also be noted that the methods used in the present invention are all conventional methods unless otherwise specified; the raw materials and devices used are all conventional commercially available products unless otherwise specified.

[0046] Example 1

[0047] like Figure 1-Figure 3 As shown, this embodiment provides a device for measuring the air flow rate in a duct, the main body of which is a backrest-type air volume meter, including a pressure taking pipe 1, a mounting seat 2 and a pressure sensor 3.

[0048] Among them, a pressure-taking tube 1 is installed at the lower part of the mounting seat 2, and a pressure sensor 3 is installed at the upper part. A quick connector 4 is provided at the end of the sensor 3 for connecting to the data cable, and can be quickly plugged in and out. Since the existing pressure-taking tube design can be divided into centralized and distributed designs according to the positional relationship between the total pressure tube and the static pressure tube (determined by the installation and measurement position), the centralized design is used for illustration in this embodiment, and those skilled in the art should not understand it as a limiting condition. Therefore, the total pressure tube 101 and the static pressure tube 102 are arranged back to back, and an oblique structure is processed at the tube mouth. The oblique structure of the total pressure tube 101 is on the windward side, and the oblique structure of the static pressure tube 102 is on the leeward side.

[0049] The device of this embodiment also includes a cleaning rod 103. The cleaning rod 103 is a flexible rod-shaped structure. The top is directly or indirectly fixedly connected to the mounting seat 2, and is hoisted in the total pressure pipe 101 and the static pressure pipe 102 respectively, and the lower part forms a free end. In this embodiment, the cleaning rod 103 can be a rubber structure or a rod-shaped structure woven from elastic fibers, so that during the ventilation process, it can collide with the inner wall of the pressure-taking pipe 1 through irregular movement, thereby scraping off the accumulated dust. In order to avoid too many cleaning rods 103 affecting the measurement work, it is designed to install a cleaning rod 103 in each pressure-taking pipe 1, and it is coaxially arranged with the corresponding pressure-taking pipe 1.

[0050] In order to avoid the cleaning rod 103 always colliding or colliding with the lower side of the pressure taking tube 1 with a high probability due to the large-angle tilted installation, the angle between the axis of the pressure taking tube 1 and the horizontal plane is designed to be in the range of 65°-90° when it is in the installation position (when the device is inverted, the angle is set to a negative value, so it is not within this range). The preferred installation position is when the axis of the pressure taking tube 1 is perpendicular to the horizontal plane, that is, when the angle is 90°.

[0051] Optionally, when the length of the cleaning rod 103 is too long, it will collide with the oblique structure, and then get stuck or break, so its length is designed to be less than or equal to the length of the pressure-taking tube 1. Among them, the length of the pressure-taking tube 1 in this embodiment is the axial projection length between the upper end point of the oblique structure and the installation position of the cleaning rod 103. Furthermore, the ratio of the maximum cross-sectional dimension of the cleaning rod 103 to the inner diameter of the pressure-taking tube is in the range of 7%-15%. Maintaining a good structural dimension relationship can reduce the influence of the cleaning rod 103 on the measurement results and achieve a better cleaning effect.

[0052] Example 2

[0053] This embodiment is based on the first embodiment. Considering that the dust cleaning rod 103 is too flexible or the wind is too strong, the dust cleaning rod 103 is easy to accumulate in the upper middle part of the pressure taking pipe 1 with the airflow. Figure 4As shown, in this embodiment, a counterweight block 1032 is provided at the end of the rod body 1031 of the cleaning rod, which can be integrally formed with the rod body 1031, or a groove can be opened later to place the counterweight block 1032, and then the counterweight block 1032 can be encapsulated by glue filling.

[0054] Optionally, if safety design is considered, a metal wire 1033 may be selectively provided inside the cleaning rod 103, such as Figure 5 As shown, it is used to strengthen the overall structure, prevent the cleaning rod 103 from breaking and falling off, and directly or indirectly fix the upper end of the metal wire 1033 to the mounting seat 2, and fix the lower end to the counterweight block 1032.

[0055] Example 3

[0056] This embodiment is based on embodiment 2. Figure 6 As shown, the rod body 1031 of the cleaning rod 103 is a cylindrical structure. This structure is simple and easy to process, and the surface is roughened to increase the scraping effect and improve the cleaning ability.

[0057] Example 4

[0058] In this embodiment, on the basis of the third embodiment, the surface of the cleaning rod 103 is provided with convex parts, and the convex parts can be distributed in a dotted manner. Figure 7 As shown, taking the spiral distribution as an example, the convex portion 1034 is spirally wound around the surface of the rod body 1031, and the cross-section is triangular. This design can increase the scraping area and strength during the collision, thereby improving the dust cleaning ability.

[0059] Example 5

[0060] This embodiment is based on the embodiment 3. Figure 8 As shown, the surface of the cleaning rod 103 is provided with 6 ridges 1035, which are evenly distributed along the circumference of the rod body 1031, and the long sides of the ridges 1035 are parallel to the axial direction of the rod body 1031. This design can improve the cleaning ability without significantly increasing the processing difficulty.

[0061] Example 6

[0062] In this embodiment, based on the second embodiment, the cross section of the dust cleaning rod 103 is a polygon. Taking a triangle as an example, Fig. 9 As shown, the rod body 1031 of this embodiment is a triangular prism, and the scraping force is increased by the side to improve the dust cleaning ability.

[0063] Example 7

[0064] In this embodiment, based on the second embodiment, the cross section of the cleaning rod 103 is a polygon. Take a triangle as an example. Fig.10As shown in the figure, the structure is twisted along the axis. This design can increase the scraping area and strength during the collision, thereby further improving the dust removal ability.

[0065] Example 8

[0066] In this embodiment, based on the second embodiment, the cross section of the dust cleaning rod 103 is a polygon. Taking a regular quadrilateral as an example, Fig.11 As shown, the rod body 1031 of this embodiment is a quadrangular prism, and the scraping force is increased by the side to improve the dust cleaning ability.

[0067] Example 9

[0068] In this embodiment, based on the second embodiment, the cross section of the cleaning rod 103 is a polygon. Take a regular quadrilateral as an example. Fig.12 As shown in the figure, the structure is twisted along the axis. This design can increase the scraping area and strength during the collision, thereby further improving the dust removal ability.

[0069] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for measuring air flow in a pipeline, which is a backrest type air flow meter, including a pressure taking pipe, a mounting seat and a pressure sensor; It is characterized in that It also includes a cleaning rod, which is a flexible rod-shaped structure; a counterweight is provided at the end of the cleaning rod; a metal wire is provided inside the cleaning rod; the upper end of the metal wire is directly or indirectly fixedly connected to the mounting seat, and the lower end is fixedly connected to the counterweight; At least one of the cleaning rods is suspended in at least one of the pressure-taking pipes, and the angle between the axis of the pressure-taking pipe and the horizontal plane when the pressure-taking pipe is in the installation position is in the range of 65°-90°.

2. The device for measuring air flow in a duct according to claim 1, characterized in that: The length of the cleaning rod is less than or equal to the length of the pressure taking pipe.

3. The device for measuring air flow in a duct according to claim 1, characterized in that: Each of the pressure-taking pipes is equipped with a cleaning rod; The dust cleaning rod is coaxially arranged with the pressure taking pipe.

4. The device for measuring air flow in a duct according to claim 1, characterized in that: The ratio of the maximum cross-sectional dimension of the cleaning rod to the inner diameter of the pressure taking pipe is in the range of 7%-15%.

5. The device for measuring air flow in a duct according to claim 1, characterized in that: The cleaning rod is in a cylindrical structure.

6. The device for measuring air flow in a duct according to claim 5, characterized in that: The surface of the cleaning rod is provided with convex parts, and the convex parts are distributed on the surface of the rod body in a point shape or a spiral shape.

7. The device for measuring air flow in a duct according to claim 5, characterized in that: The surface of the cleaning rod is provided with a plurality of ridges, the ridges are evenly distributed along the circumference of the rod body, and the long sides of the ridges are parallel to the axial direction of the rod body.

8. The device for measuring air flow in a duct according to claim 1, characterized in that: The cross section of the cleaning rod is a polygon; The rod body of the cleaning rod is in a twisted structure along the axis.

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