A multi-point air volume measuring device

Abstract

The present invention relates to the technical field of air volume measurement devices, and specifically relates to a multi-point air volume measurement device; a rolling ball rollingly connected within a bracket mechanism cooperates with a threaded rod passing through the rolling ball and threadedly connected thereto to form a seesaw effect, and the position of the rolling ball is adjusted by threading to achieve balance on both sides. The air inlet pipe assembly and the back air pipe assembly provided at both ends of the threaded rod are balanced on the threaded rod, so that balance can be maintained when the rolling ball rotates to any position. An umbrella-shaped adjustment assembly provided on the back air pipe assembly gradually rotates to a position with uniform pressure due to uneven surface pressure when the air flow trajectory changes, thereby driving the back air pipe assembly and the air inlet pipe assembly to correspondingly rotate to a position where the cross-section of the pipe orifice is perpendicular to the air flow trajectory, so as to automatically change according to the change of the air flow and improve the measurement accuracy; it solves the problem that measurement errors are likely to occur when measuring the air volume of the air flow in the measurement channel when the air flow trajectory changes.

Description

Technical Field

[0001] The present invention relates to the technical field of air volume measurement devices, and particularly to a multi-point air volume measurement device. Background Art

[0002] Air volume measurement devices are mainly used to measure the magnitude of air volume, mainly calculated through Bernoulli's equation. By separately measuring the total pressure on the windward side and the static pressure on the leeward side, the difference between the total pressure and the static pressure is called the differential pressure. Its magnitude is related to the wind speed in the measurement channel. The greater the wind speed, the greater the differential pressure; the smaller the wind speed, the smaller the differential pressure. Then, the air volume at the measurement point is calculated through Bernoulli's equation. Multi-point air volume measurement devices are mainly used in channels with a relatively large diameter. By measuring at multiple points, the average value of the pressure is obtained, and thus the average value of the air volume in the pipeline is obtained.

[0003] The magnitude of the total pressure mainly depends on the magnitude of the air volume entering the measurement pipeline. Therefore, when measuring, it is necessary to make the cross-section of the pipeline for measuring the total pressure perpendicular to the flow trajectory of the air flow. Therefore, generally, the air flow direction in the channel is measured before installation and then installed. However, the measured air flow direction is only the direction at that time. Especially in some channels with a relatively large diameter, the air flow direction is not constant. When the air volume of the air flow remains unchanged and the air flow direction is not perpendicular to the cross-section of the pipeline for measurement, the measured air volume will decrease. The greater the angle of deviation of the air flow direction from the initial angle, the smaller the measured air volume, thus causing measurement errors. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a multi-point air volume measurement device, which solves the problem of easy generation of measurement errors when the air flow trajectory changes during the measurement of the air volume in the measurement channel.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A multi-point air volume measurement device includes a support mechanism as an installation carrier. A display mechanism for calculating and displaying the air volume value is fixed on the top of the support mechanism. A measurement mechanism for measuring the air flow pressure difference is vertically installed on the support mechanism.

[0009] The measuring mechanism includes a plurality of rolling balls that are rollingly connected within the support mechanism. A threaded rod passes through both sides of the rolling ball at its center. One end of the threaded rod is fixed with an air inlet pipe assembly facing the flowing air current. A telescopic first hose is connected between the plurality of air inlet pipe assemblies. The other end of the threaded rod is fixed with a back air pipe assembly symmetrically arranged with the air inlet pipe assembly. A second hose is fixed between the plurality of back air pipe assemblies. An expandable umbrella-shaped adjustment assembly is fixed to the outer wall of the back air pipe assembly.

[0010] Preferably, the support mechanism includes a fixing plate that is rollingly connected to the rolling ball. A pressing plate that is rollingly connected to the rolling ball is detachably fixed on the fixing plate. A connecting rod is fixed between the fixing plates. An installation rod is fixed to the top of the fixing plate close to the display mechanism. An installation flange is fixed on the installation rod.

[0011] Preferably, the display mechanism includes two pressure sensors respectively arranged at the top pipe orifices of the air inlet pipe assembly and the back air pipe assembly close to the display mechanism. A calculating device for calculating and displaying the air volume is provided at the top of the installation rod.

[0012] Preferably, the air inlet pipe assembly includes a ventilation pipe fixed to one end of the threaded rod. An air inlet pipe is connected to the pipe orifice of the ventilation pipe facing the flowing air current. An air inlet with a diameter smaller than that of the ventilation pipe is provided at the pipe orifice of the air inlet pipe facing the flowing air current. An air outlet pipe is connected to the top pipe orifice of the ventilation pipe close to the display mechanism. An air outlet with a diameter smaller than that of the ventilation pipe is provided at the top of the air outlet pipe. A total pressure pipe is connected to the top of the air outlet pipe.

[0013] Preferably, the back air pipe assembly includes a back air pipe fixed to the end of the threaded rod. A pressure accumulation pipe is connected to the top of the back air pipe close to the display mechanism. A back pressure pipe is connected to the top pipe orifice of the pressure accumulation pipe.

[0014] Preferably, the umbrella-shaped adjustment assembly includes an installation ring horizontally fixed on the back air pipe. A plurality of installation slots are opened on the side of the installation ring away from the threaded rod. A support rod is rotatably installed in the installation slot. A chute with one end open is provided in the support rod. An adjustment ring arranged in the chute is threadedly connected to the installation ring. An elastic adjustment film is fixed between the support rods.

[0015] Preferably, a smooth arc surface for sliding connection with the adjustment ring is provided on the bottom wall of the chute. A threaded surface for threaded connection with the outer wall of the installation ring is provided on the inner side of the adjustment ring. A sliding surface opposite to the threaded surface is provided on the adjustment ring.

[0016] Preferably, a balance block is threadedly connected to one end of the threaded rod close to the air inlet pipe assembly.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a multi-point air volume measuring device, which has the following beneficial effects:

[0019] The rolling ball connected in the bracket mechanism cooperates with the threaded rod that passes through the rolling ball and is threadedly connected to the rolling ball to form a seesaw effect, and the balance on both sides is achieved by adjusting the position of the rolling ball through the thread. The air inlet duct assembly and the leeward duct assembly arranged at both ends of the threaded rod maintain balance on the threaded rod, so that the balance can be maintained when the rolling ball rotates to any position. The umbrella-shaped adjustment assembly arranged on the leeward duct assembly gradually rotates to a position with uniform pressure due to uneven surface pressure when the airflow trajectory changes, thereby driving the leeward duct assembly and the air inlet duct assembly to rotate accordingly to a position where the cross section of the pipe mouth is perpendicular to the airflow trajectory, thereby automatically changing according to changes in airflow, thereby improving measurement progress.

[0020] The air inlet arranged on the air inlet duct assembly prevents the air flow from directly contacting the inner wall of the air inlet duct assembly when the air flow changes, thereby driving the air inlet duct assembly to rotate, thereby affecting the adjustment function of the umbrella-shaped adjustment assembly, thereby avoiding further expansion of the error. The air outlet and pressure gathering port respectively arranged on the air inlet duct assembly and the leeward duct assembly realize pressure amplification, thereby facilitating the pressure sensor to measure the pressure and improving the accuracy of the data.

[0021] The arc surface on the bottom wall of the slide groove cooperates with the sliding surface of the adjusting ring, so that when the adjusting ring and the support rod move relative to each other, they always support the upper and lower walls of the slide groove and can move smoothly, thereby not only being able to smoothly adjust the angle of the support rod, but also being able to quickly position the support rod, which is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 is a schematic diagram of the measuring mechanism of the present invention;

[0025] Figure 3 is a schematic diagram of the display mechanism of the present invention;

[0026] Figure 4 is a schematic diagram of the support mechanism of the present invention;

[0027] Figure 5 is a schematic diagram of an air inlet duct assembly of the present invention;

[0028] Figure 6 is a schematic diagram of an umbrella-shaped adjustment assembly of the present invention;

[0029] Figure 7 is a schematic diagram of a support rod of the present invention;

[0030] Figure 8 This is a schematic diagram of the balance weight of the present invention.

[0031] In the figure: 1. Bracket mechanism; 11. Fixed plate; 12. Pressing plate; 13. Connecting rod; 14. Mounting rod; 15. Mounting flange; 2. Display mechanism; 21. Pressure sensor; 22. Calculation device; 3. Measuring mechanism; 31. Rolling ball; 32. Threaded rod; 33. Air inlet pipe assembly; 331. Ventilation pipe; 332. Air inlet pipe; 333. Air inlet; 334. Air outlet pipe; 335. Air outlet; 336. Total pressure pipe; 34. First hose; 35. Back air pipe assembly; 351. Back air pipe; 352. Pressure accumulation pipe; 353. Pressure accumulation port; 354. Back pressure pipe; 36. Second hose; 37. Umbrella-shaped adjustment assembly; 371. Mounting ring; 372. Mounting groove; 373. Support rod; 374. Chute; 375. Adjusting ring; 376. Adjusting film; 377. Arc surface; 378. Threaded surface; 379. Sliding surface; 38. Balance weight. Specific embodiments

[0032] The following will cooperate with the drawings and embodiments to elaborate in detail on the implementation manners of the present application, so as to fully understand the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects and implement accordingly.

[0033] Embodiment 1

[0034] Figures 1 - 7 This is an embodiment of the present invention. By installing a device on the pipeline for measuring air volume that can adjust the orientation of the pipeline nozzle for measuring air volume according to the change of the air flow trajectory, the air flow trajectory is always perpendicular to the cross-section of the pipeline for measuring air volume, thereby reducing the measurement error.

[0035] A multi-point air volume measuring device includes a bracket mechanism 1 as an installation carrier. A display mechanism 2 for calculating and displaying the air volume value is fixed on the top of the bracket mechanism 1. A measuring mechanism 3 for measuring the air flow pressure difference is vertically installed on the bracket mechanism 1. The measuring mechanism 3 is used to measure the total pressure and static pressure of the air flow. The display mechanism 2 calculates the pressure difference between the total pressure and the static pressure and further calculates the air volume, and finally displays the air volume, which is simple and intuitive.

[0036] The measuring mechanism 3 includes a plurality of rolling balls 31 that are rollingly connected within the support mechanism 1. The rolling balls 31 can rotate freely within the support mechanism 1. A threaded rod 32 that penetrates both sides thereof is threadedly connected at the center of the rolling ball 31. One end of the threaded rod 32 is fixed with an air inlet pipe assembly 33 facing the flowing air current. A telescopic first hose 34 is connected between the plurality of air inlet pipe assemblies 33. The other end of the threaded rod 32 is fixed with an air back pipe assembly 35 that is symmetrically arranged with the air inlet pipe assembly 33. A second hose 36 is fixed between the plurality of air back pipe assemblies 35. Thus, the air inlet pipe assembly 33 and the air back pipe assembly 35 are respectively located on both sides of the rolling ball 31. By adjusting the position of the rolling ball 31 on the threaded rod 32, the two sides are kept balanced. An umbrella-shaped adjustment assembly 37 that can be opened is fixed on the outer wall of the air back pipe assembly 35. When the air flow trajectory changes, it will blow the surface of the umbrella-shaped adjustment assembly 37, causing the umbrella-shaped adjustment assembly 37 to drive the air back pipe assembly 35 to deflect accordingly around the rolling ball 31, and thus also drive the air inlet pipe assembly 33 to move synchronously. When the air flow balances the umbrella-shaped adjustment assembly 37, the thrusts of the air flow received by each part of the umbrella-shaped adjustment assembly 37 are equal. At this time, the central axis of the umbrella-shaped adjustment assembly 37 just coincides with the air flow trajectory, and the central axis of the umbrella-shaped adjustment assembly 37 in the horizontal direction just coincides with the central axis of the air back pipe assembly 35, and the central axes of the air inlet pipe assembly 33 and the air back pipe assembly 35 also coincide. Thus, the pipe cross-section of the air inlet pipe assembly 33 is perpendicular to the air flow trajectory, thereby ensuring the accuracy of the air volume measurement and reducing errors.

[0037] As a preferred technical solution of this embodiment, the support mechanism 1 includes a fixing plate 11 that is rollingly connected to the rolling ball 31. A pressing plate 12 that is rollingly connected to the rolling ball 31 is detachably fixed on the fixing plate 11. The fixing plate 11 and the pressing plate 12 rollingly connect the rolling ball 31 at the center and enable disassembly and assembly. A connecting rod 13 is fixed between the fixing plates 11. At the top of the fixing plate 11 close to the display mechanism 2, a mounting rod 14 is fixed. A mounting flange 15 is fixed on the mounting rod 14. Thus, the installation of the rolling ball 31 is realized, enabling the rolling ball 31 to rotate freely under the drive of an external force. Thus, after the air flow trajectory changes, the air back pipe assembly 35 can drive the air inlet pipe assembly 33 to change through the rolling ball 31, realizing the adjustment function.

[0038] As a preferred technical solution of this embodiment, the display mechanism 2 includes two pressure sensors 21 that are respectively arranged at the top pipe orifices of the air inlet pipe assembly 33 and the air back pipe assembly 35 close to the display mechanism 2. The pressure sensors 21 respectively obtain the pressure values inside the air inlet pipe assembly 33 and the air back pipe assembly 35. A calculation device 22 for calculating and displaying the air volume is provided at the top of the mounting rod 14. The calculation device 22 calculates the air volume at the measurement point according to the pressure values inside the air inlet pipe assembly 33 and the air back pipe assembly 35 and displays the size of the air volume, which is simple and convenient.

[0039] As a preferred technical solution of this embodiment, the air inlet pipe assembly 33 includes a ventilation pipe 331 fixed to one end of the threaded rod 32. An air inlet pipe 332 is connected to the pipe orifice of the ventilation pipe 331 facing the flowing air current. An air inlet 333 with a diameter smaller than that of the ventilation pipe 331 is provided at the pipe orifice of the air inlet pipe 332 facing the flowing air current. After the air flow trajectory changes, it enters the ventilation pipe 331 and the air inlet pipe 332 through the air inlet 333. Since the diameter of the air inlet 333 is small, it avoids the air flow directly generating a thrust on the pipe walls of the ventilation pipe 331 and the air inlet pipe 332, thus preventing the rotation of the air inlet pipe assembly 33 and avoiding the expansion of the measurement error. A discharge pipe 334 is connected to the top pipe orifice of the ventilation pipe 331 close to the display mechanism 2. An air outlet 335 with a diameter smaller than that of the ventilation pipe 331 is provided at the top of the discharge pipe 334. A total pressure pipe 336 is connected to the top of the discharge pipe 334. According to the venturi effect, the air outlet 335 increases the pressure of the air flow, achieving the effect of amplifying the pressure, so that the pressure sensor 21 installed in the total pressure pipe 336 can more sensitively measure the pressure, thereby obtaining more accurate measurement data.

[0040] As a preferred technical solution of this embodiment, the back air pipe assembly 35 includes a back air pipe 351 fixed to the end of the threaded rod 32. A pressure accumulating pipe 352 is connected to the top of the back air pipe 351 close to the display mechanism 2. A pressure accumulating port 353 with a diameter smaller than that of the back air pipe 351 is provided at the top of the pressure accumulating pipe 352. A back pressure pipe 354 is connected to the top pipe orifice of the pressure accumulating pipe 352. According to the venturi effect, the pressure accumulating port 353 increases the pressure of the air flow, achieving the effect of amplifying the pressure, so that the pressure sensor 21 installed in the back pressure pipe 354 can more sensitively measure the pressure, thereby obtaining more accurate measurement data.

[0041] As a preferred technical solution of this embodiment, the umbrella-shaped adjustment assembly 37 includes a mounting ring 371 horizontally fixed on the back air pipe 351. A plurality of mounting grooves 372 are formed on the side of the mounting ring 371 away from the threaded rod 32. A support rod 373 is rotatably installed in the mounting groove 372. A sliding groove 374 with one end open is formed in the support rod 373. An adjustment ring 375 disposed in the sliding groove 374 is threadedly connected to the mounting ring 371. The movement of the adjustment ring 375 will push the inner wall of the sliding groove 374, thereby driving the support rod 373 to rotate. An elastic adjustment film 376 is fixed between the support rods 373. When the support rod 373 rotates towards the threaded rod 32, it will drive the adjustment film 376 to open, thus increasing the contact area with the external air flow. When the air flow trajectory changes, the pressure on the adjustment film 376 facing the air flow will increase, so that the pressures received outside the plurality of adjustment films 376 are different, driving the back air pipe assembly 35 to rotate. Subsequently, the back air pipe assembly 35 drives the air inlet pipe assembly 33 to rotate through the threaded rod 32. The cross-section of the pipe orifice of the air inlet pipe assembly 33 is perpendicular to the air flow trajectory, improving the measurement progress of the air volume.

[0042] As a preferred technical solution of this embodiment, a smooth arc surface 377 that is slidably connected to the adjustment ring 375 is provided on the bottom wall of the chute 374. A threaded surface 378 that is threadedly connected to the outer wall of the mounting ring 371 is provided inside the adjustment ring 375. A sliding surface 379 opposite to the threaded surface 378 is provided on the adjustment ring 375. The diameter of the sliding surface 379 is equal to the groove width of the chute 374, so that the sliding surface 379 slides on the inner wall of the chute 374, preventing it from being blocked by corners during movement and ensuring smoothness during adjustment.

[0043] Embodiment 2

[0044] Figure 8 This is an embodiment of the present invention, and the balance of the weights on both sides of the rolling ball 31 is further adjusted through another structure.

[0045] The difference between Embodiment 2 and Embodiment 1 is that a balance block 38 is threadedly connected to one end of the threaded rod 32 close to the air inlet pipe assembly 33. When the processing accuracy is insufficient and the weight difference of the rolling balls 31 is large enough that the two sides cannot be balanced by moving the position of the rolling balls 31, the balance block 38 is used to further adjust, so that the weights on both sides are equal, and the rolling balls 31 can achieve balance when rotated to any position, thereby improving the measurement accuracy.

[0046] It should be noted that in this article, the terms "including", "comprising" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-point air volume measuring device, comprising a bracket mechanism (1) serving as an installation carrier, and a display mechanism (2) for calculating and displaying air volume values is fixedly arranged at the top of the bracket mechanism (1), characterized in that: A measuring mechanism (3) for measuring the air flow pressure difference is vertically installed on the bracket mechanism (1); The measuring mechanism (3) includes a plurality of rolling balls (31) that are rollingly connected within the bracket mechanism (1). A threaded rod (32) passes through both sides of the rolling ball (31) in a threaded manner. One end of the threaded rod (32) is fixed with an air inlet pipe assembly (33) facing the flowing air. A telescopic first hose (34) is connected between the plurality of air inlet pipe assemblies (33). The other end of the threaded rod (32) is fixed with a back air pipe assembly (35) symmetrically arranged with the air inlet pipe assembly (33). A second hose (36) is fixed between the plurality of back air pipe assemblies (35). An umbrella-shaped adjustment assembly (37) that can be opened is fixed on the outer wall of the back air pipe assembly (35); The back air pipe assembly (35) includes a back air pipe (351) fixed to the end of the threaded rod (32). A pressure collecting pipe (352) is connected to the top of the back air pipe (351) near the display mechanism (2). A pressure collecting port (353) with a diameter smaller than that of the back air pipe (351) is provided at the top of the pressure collecting pipe (352). A back pressure pipe (354) is connected to the top pipe orifice of the pressure collecting pipe (352); The umbrella-shaped adjustment assembly (37) includes a mounting ring (371) horizontally fixed on the back air pipe (351). A plurality of mounting grooves (372) are formed on the side of the mounting ring (371) away from the threaded rod (32). A support rod (373) is rotatably installed in the mounting groove (372). A chute (374) with one end open is formed in the support rod (373). An adjustment ring (375) arranged in the chute (374) is threadedly connected to the mounting ring (371). An elastic adjustment film (376) is fixed between the support rods (373).

2. The multi-point air volume measuring device according to claim 1, characterized in that: The bracket mechanism (1) includes a fixing plate (11) that is rollingly connected to the rolling ball (31). A pressing plate (12) that is rollingly connected to the rolling ball (31) is detachably fixed on the fixing plate (11). A connecting rod (13) is fixed between the fixing plates (11). An installation rod (14) is fixed to the top of the fixing plate (11) near the display mechanism (2). An installation flange (15) is fixed on the installation rod (14).

3. The multi-point air volume measuring device according to claim 2, characterized in that: The display mechanism (2) includes two pressure sensors (21) respectively arranged at the top pipe orifices of the air inlet pipe assembly (33) and the back air pipe assembly (35) near the display mechanism (2). A calculation device (22) for calculating and displaying the air volume is provided at the top of the installation rod (14).

4. A multi-point air volume measuring device according to claim 1, characterized in that: The air inlet pipe assembly (33) includes a ventilation pipe (331) fixed to one end of the threaded rod (32). An air inlet pipe (332) is connected to the pipe orifice of the ventilation pipe (331) facing the flowing air. An air inlet (333) with a diameter smaller than that of the ventilation pipe (331) is provided at the pipe orifice of the air inlet pipe (332) facing the flowing air. An air outlet pipe (334) is connected to the top pipe orifice of the ventilation pipe (331) near the display mechanism (2). An air outlet (335) with a diameter smaller than that of the ventilation pipe (331) is provided at the top of the air outlet pipe (334). A total pressure pipe (336) is connected to the top of the air outlet pipe (334).

5. The multi-point air volume measuring device according to claim 1, characterized in that: The bottom wall of the sliding groove (374) is provided with a smooth arc surface (377) that is slidably connected to the adjustment ring (375). The inner side of the adjustment ring (375) is provided with a threaded surface (378) that is threadedly connected to the outer wall of the mounting ring (371). The adjustment ring (375) is provided with a sliding surface (379) opposite to the threaded surface (378).

6. The multi-point air volume measuring device according to claim 1, characterized in that: One end of the threaded rod (32) close to the air inlet pipe assembly (33) is threadedly connected with a balance weight (38).

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