Pitot tube for measuring air volume

Abstract

The utility model discloses a pitot tube for measuring air volume, which is characterized in that a pitot tube body is of an integral profile structure, two independent through tubular cavity structures are formed on two sides of a profile, a plurality of groups of through holes are distributed in the outer side wall of the pitot tube body along the direction of a central axis, and the plurality of groups of through holes are communicated with the interior of the tubular cavity; the pitot tube bodies are distributed in parallel in pairs in the vertical direction, so that the multiple groups of through holes of one group of pitot tube bodies are positioned on the windward side, and the multiple groups of through holes of the other group of pitot tube bodies are positioned on the leeward side; fixing and wrapping are formed along the central axis direction of the two groups of pitot tube bodies through connecting pieces; openings are formed in the two sides, where the first through holes are located, of the pitot tube bodies, and the through holes of the pitot tube bodies are communicated with the outside. According to the improved pitot tube for measuring the air volume, the defects of a traditional pitot tube are overcome through reasonable structural design and accurate pressure difference measurement, and the improved pitot tube has higher practicability and reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of air volume detection equipment, specifically relating to a Pitot tube for air volume measurement. Background Technology

[0002] In modern industry and scientific research, airflow measurement is a crucial step, widely used in ventilation systems, air conditioning equipment, wind tunnel experiments, and many other fields. Accurate measurement of airflow velocity and flow rate is essential for optimizing system design, improving energy efficiency, and ensuring safe operation. Traditional airflow measurement methods, such as hot-wire anemometers, rotating anemometers, and ultrasonic anemometers, while performing well in some applications, still have limitations in terms of measurement accuracy, response time, and applicability.

[0003] A pitot tube measures only the total pressure of the airflow and is also known as a total pressure tube; only those that measure both total pressure and static pressure are called anemometers, but anemometers are more commonly referred to as pitot tubes. Currently, the mainstream pitot tubes in China are those with two openings that utilize the differential pressure principle.

[0004] Pitot tubes, as a classic airflow measurement tool, are widely used for measuring airflow velocity and pressure due to their simple structure, low cost, and ease of maintenance. Their working principle is based on Bernoulli's principle, calculating airflow velocity by comparing the pressure difference between the windward and leeward sides. However, traditional pitot tubes often face the following problems in practical applications:

[0005] Airflow disturbance: In complex airflow environments, the design and installation location of the pitot tube may cause airflow disturbance, thereby affecting measurement accuracy.

[0006] Pitot tube structure such as Figure 1 As shown, the system consists of a dynamic pressure tube and a static pressure tube, which are independently arranged in parallel. The pressure of the airflow entering the dynamic pressure tube orifice of the Pitot tube includes not only the static pressure of the fluid itself but also the pressure converted from kinetic energy (dynamic pressure) after the fluid stagnates; the sum of these two is the total pressure. The pressure entering the static pressure tube orifice of the Pitot tube is only the static pressure of the fluid. When facing an airflow, due to airflow disturbance between the dynamic and static pressure tubes, the pressure value measured in the static pressure tube orifice is unstable and the measured pressure value is less than the difference between static and dynamic pressure. Utility Model Content

[0007] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a Pitot tube for air volume measurement, which solves the above-mentioned technical problems existing in the prior art.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] The application discloses a pitot tube for wind volume measurement, which comprises a pitot tube body and a connecting piece, a tubular cavity structure is formed through the middle part of the pitot tube body, and a plurality of groups of through holes are arranged along the central axis direction of the outer side wall of the pitot tube body and are in communication with each other in the tubular cavity.

[0010] The pitot tube bodies are arranged in parallel in the vertical direction, and the plurality of groups of through holes of one group of the pitot tube bodies are arranged on the windward surface, and the plurality of groups of through holes of another group of the pitot tube bodies are arranged on the leeward surface.

[0011] The connecting piece is fixed and wrapped along the central axis direction of the two groups of pitot tube bodies.

[0012] The connecting piece comprises a first through hole and a second through hole, the first through hole is arranged on both sides in a symmetrical mode, and the two groups of pitot tube bodies are arranged in the first through hole, so that the connecting piece is wrapped outside the two groups of pitot tube bodies, and openings are arranged on both sides of the first through hole, so that the through holes of the pitot tube bodies are in communication with the outside.

[0013] The second through hole is arranged at the end of the connecting piece and is arranged at the middle position of the two groups of first through holes, and the end of the second through hole is fixed by a bolt.

[0014] Further, the plurality of groups of through holes on the two groups of pitot tube bodies are arranged on the same horizontal plane, and the through holes on the windward surface of the two groups of pitot tube bodies are arranged on the same straight line.

[0015] Further, the connecting piece is an integral forming structure.

[0016] Further, a cavity is arranged through the first through hole and the second through hole of the connecting piece, and the cavity is arranged in the extension direction of the first through hole.

[0017] Further, the outer periphery of the connecting piece is an integral structure, and the outer side edges of the connecting piece are parallel to each other in the windward direction.

[0018] Further, a third through hole is arranged at the end of the first through hole, and the third through hole is in communication with the first through holes of the two groups of pitot tube bodies.

[0019] Further, a differential pressure sensor high-voltage end is connected in the first through hole of the pitot tube body on the windward surface, and a differential pressure sensor low-voltage end is connected in the first through hole of the pitot tube body on the leeward surface, and the pressure difference between the high-voltage and the low-voltage recorded by the differential pressure sensor is recorded.

[0020] Further, an annular ring is arranged on the outer wall of the front end of the first through hole where the end of the middle cavity of the pitot tube body is located, and a sealing ring is arranged on the outer periphery of the annular ring, and the sealing ring is fixed and sealed with the inner wall of the tubular cavity of the pitot tube body.

[0021] The utility model discloses beneficial effect:

[0022] 1, the pitot tube body middle part of the device adopts the tubular cavity that forms and provides the space required for airflow measurement, and the fluid dynamics performance is enhanced. The outer side wall has multiple groups of through holes arranged along the central axis direction, and the windward surface and the leeward surface are arranged respectively, which can effectively capture the static pressure of different airflow velocities.

[0023] 2, the differential pressure sensor is connected through the first through hole and the second through hole, and the high and low pressures are measured on the windward surface and the leeward surface respectively, which is convenient for accurate calculation of airflow dynamic pressure. The airflow measurement pitot tube improves the measurement accuracy, stability and practicability through innovative structure design, and meets the demand of modern airflow measurement.

[0024] 3, the sealing ring is arranged at the end of the pitot tube body and is attached to the inner wall of the tubular cavity, which ensures the accuracy of gas flow and avoids external gas interference. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiment of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description.

[0026] Figure 1 is the airflow flow diagram of the prior art pitot tube;

[0027] Figure 2 is the overall cross-sectional structure schematic diagram of the embodiment of the utility model;

[0028] Figure 3 is the airflow flow diagram of the pitot tube body of the embodiment of the utility model;

[0029] Figure 4 is the Figure 2 partial structure schematic diagram of the embodiment of the utility model. DETAILED DESCRIPTION

[0030] The technical scheme in the embodiment of the utility model will be described clearly and completely in combination with the drawings in the embodiment of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0031] As Figure 2As shown, the utility model embodiment provides a kind of pitot tube for air volume measurement, including pitot tube body 1, connecting piece 2, the middle part of pitot tube body 1 is formed through tubular cavity 101 structure, simultaneously, multiple groups of through holes 102 are distributed along the central axis direction of the outer side wall of pitot tube body 1, so that several groups of through holes 102 are interconnected in tubular cavity 101;At this time, pitot tube body 1 is distributed in vertical direction two by two parallel, so that the multiple groups of through holes 102 of one group of pitot tube body 1 are located on windward surface, the multiple groups of through holes 102 of another group of pitot tube body 1 are located on leeward surface, while several groups of through holes 102 on two groups of pitot tube body 1 are located on the same horizontal plane, and realize that two by two windward surface direction through hole 102 is located on the same straight line.Windward surface through hole captures higher airflow speed, generates larger static pressure;And the airflow speed captured by leeward surface through hole is lower, and smaller static pressure is generated.

[0032] As shown in Figure 3 、 Figure 4 Connecting piece 2 is formed fixedly and wrapped along the central axis direction of two groups of pitot tube body 1, and this processing mode can realize that connecting piece 2 and pitot tube body 1 form a whole, and the airflow disturbance phenomenon in Figure 1 Cannot appear.

[0033] In order to further reduce the disturbance of airflow, connecting piece 2 is integrally formed structure, and the outer periphery where connecting piece 2 is located is formed as a whole, and in windward surface direction, the outer side edges where connecting piece 2 is located are parallel to each other.

[0034] Second through hole 22 is located at the end of connecting piece 2, and is located at the intermediate position of two groups of first through holes 21, and is fixed as a whole at the end of second through hole 22 by bolt piece, the high-pressure end of differential pressure sensor is connected in the first through hole 21 where pitot tube body 1 is located on windward surface, the low-pressure end of differential pressure sensor is connected in the first through hole 21 where pitot tube body 1 is located on leeward surface, and the pressure difference between high pressure and low pressure recorded by differential pressure sensor is that, the pressure detected by the through hole 102 on windward surface at this time is P A (total pressure)=dynamic pressure+static pressure, the pressure detected by the through hole 102 on leeward surface is P B (static pressure)=static pressure-dynamic pressure, the pressure difference detected between A and B at this time is P=P A -P B =2 times dynamic pressure.The data detected is more real and effective, and error is reduced.

[0035] The connecting piece 2 comprises first through holes 21 and second through holes 22, the first through holes 21 are two groups and symmetrically distributed at two side positions, and the two groups of pitot tube bodies 1 penetrate into the adjacent two groups of first through holes 21. The connecting piece 2 forms the outer wrapping of the two groups of pitot tube bodies 1, and openings are arranged at both sides where the first through holes 21 are located, forming the through holes 102 of the pitot tube bodies 1 in communication with the outside, and not affecting the windward position of the through holes 102.

[0036] The cavity 201 is arranged to penetrate between the first through holes 21 and the second through holes 22 of the connecting piece 2, and the cavity 201 is arranged in the extension direction of the first through holes 21. This design can reduce the material consumption of the whole component and reduce the cost expenditure while ensuring the appearance of the connecting piece 2.

[0037] The third through hole 23 is arranged at the end position of the first through hole 21, and the third through hole 23 is in communication with the first through hole 21 on the two groups of pitot tube bodies 1. The differential pressure sensor can be connected in the first through hole 21 of the pitot tube body 1 through the third through hole 23.

[0038] The annular ring is arranged at the outer wall of the front end of the first through hole 21 at the end of the cavity of the pitot tube body 1, and the sealing ring 103 is arranged at the outer periphery of the annular ring. The sealing ring 103 is sealed and fixed with the inner wall of the tubular cavity 101 of the pitot tube body 1. This design can realize the sealing of the end of the pitot tube body 1, and the sealing ring 103 ensures the accuracy of gas flow and avoids the interference of external gas, thereby improving the measurement accuracy.

[0039] The pitot tube of the embodiment realizes accurate measurement of air flow through reasonable structure design and accurate differential pressure measurement, is suitable for various air volume measurement occasions, and has high practicability and reliability.

[0040] The basic principle, main characteristics and advantages of the utility model are shown and described. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model can have various changes and improvements, and these changes and improvements all fall within the scope of the utility model.

Claims

1. A pitot tube for measuring air volume, comprising a pitot tube body (1), a connecting piece (2), characterized in that, The middle part of the pitot tube body (1) forms a through tubular cavity (101) structure, and a plurality of groups of through holes (102) are arranged in the direction of the central axis of the outer side wall of the pitot tube body (1) and are in communication with each other in the tubular cavity (101); The pitot tube bodies (1) are arranged in parallel in the vertical direction, and the plurality of groups of through holes (102) of one group of the pitot tube bodies (1) are arranged on the windward side, and the plurality of groups of through holes (102) of the other group of the pitot tube bodies (1) are arranged on the leeward side; The central axis of the two groups of pitot tube bodies (1) is fixed and wrapped by the connecting piece (2); The connecting piece (2) comprises a first through hole (21) and a second through hole (22), the first through hole (21) is arranged on both sides, and the two groups of pitot tube bodies (1) penetrate the first through hole (21), so that the connecting piece (2) wraps the two groups of pitot tube bodies (1), and openings are arranged on both sides of the first through hole (21), so that the through holes (102) of the pitot tube bodies (1) are in communication with the outside; The second through hole (22) is arranged at the end of the connecting piece (2) and is located between the two groups of first through holes (21), and the end of the second through hole (22) is fixed by a bolt.

2. The pitot tube for wind measurement according to claim 1, characterized by The plurality of groups of through holes (102) on the two groups of pitot tube bodies (1) are located on the same horizontal plane, and the through holes (102) on the windward side are located on the same straight line.

3. The pitot tube for wind measurement according to claim 1, characterized by The connecting piece (2) is an integral structure.

4. The pitot tube for wind measurement according to claim 1, characterized by A through cavity (201) is arranged between the first through hole (21) and the second through hole (22) of the connecting piece (2), and the cavity (201) is arranged in the extension direction of the first through hole (21).

5. The pitot tube for wind measurement according to claim 3, characterized by The outer periphery of the connecting piece (2) is formed as a whole, and the outer side edges of the connecting piece (2) are parallel to each other in the windward direction.

6. The pitot tube for wind measurement according to claim 3, characterized by A third through hole (23) is arranged at the end of the first through hole (21), and the third through hole (23) is in communication with the first through hole (21) of the two groups of pitot tube bodies (1).

7. The pitot tube for wind measurement according to claim 1, characterized by A differential pressure sensor high-voltage end is connected in the first through hole (21) of the pitot tube body (1) on the windward side, and a differential pressure sensor low-voltage end is connected in the first through hole (21) of the pitot tube body (1) on the leeward side, and the differential pressure between the high-voltage and the low-voltage is recorded by the differential pressure sensor.

8. The pitot tube for wind measurement according to claim 1, characterized by An annular ring is arranged on the outer wall of the front end of the first through hole (21) at the end of the middle cavity of the pitot tube body (1), and a sealing ring (103) is arranged on the outer periphery of the annular ring, and the sealing ring (103) is in sealing contact with the inner wall of the tubular cavity (101) of the pitot tube body (1).

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