Rotating mechanism for bidirectional dynamic pressure measurement sensor

Abstract

The present invention discloses a rotating mechanism for a bidirectional dynamic pressure measurement sensor, comprising: a connection seat (1), the upper part of which is used to connect a fluid pressure sensor; a cavity (2), the top of which is fixed to the bottom of the connection seat (1); a sampling component (5), the top of which is movably connected to the bottom of the cavity (2), so that the sampling component (5) can rotate in the horizontal direction relative to the cavity (2), wherein a vertical partition (3) is arranged in the cavity (2) for dividing the interior of the cavity (2) into two mutually isolated parts, and the sampling component (5) is fixed with two guide tubes (4) in the vertical direction, the upper ends of the guide tubes (4) respectively extend into one of the two parts of the cavity (2), and the lower ends of the guide tubes (4) are respectively connected to the fluid pressure sampling ports. The present invention has a simple and compact structure, which is not only convenient for installation and adjustment of angles, but also convenient for the application of various sensors such as static pressure, differential pressure, flow rate, flow rate, etc. based on the principle of dynamic pressure measurement.

Description

Technical Field

[0001] The present invention belongs to the technical field of sensor detection component structural design, and in particular relates to a rotating mechanism for a bidirectional dynamic pressure measurement sensor. Background Art

[0002] The bidirectional dynamic pressure detection sensor realizes the measurement of bidirectional static pressure, positive pressure, negative pressure and differential pressure based on the dynamic pressure principle. When equipped with a pitot tube, it can directly measure the flow velocity and flow rate of fluids in two directions. It is an ideal instrument for environmental monitoring stations, factories, mines, and building heating and ventilation testing.

[0003] The bidirectional dynamic pressure measurement sensor mainly includes an electrical body, a detection structure component and a pipeline mounting part, wherein the detection structure component is fixed to the electrical body of the sensor, and the pipeline mounting part is installed at the tail end of the detection structure component and connected to the pipeline to be measured. The axis of the positive and negative bidirectional sampling ports of the detection component remains parallel to the pipeline. The detection structure component applies the pressure of the measured pipeline gas to the pressure transmitter in the electrical body through the drainage pipeline.

[0004] The bidirectional dynamic pressure detection sensor can measure the fluid pressure parameters in two directions on narrow pipelines such as pipelines, tunnels, and mine tunnels. Usually, the electrical body of the sensor is relatively fixed to the detection structure component, the axes of the positive and negative bidirectional sampling ports of the detection structure component are parallel to the pipeline, and the display window of the sensor body is parallel to the bidirectional horizontal lines of the detection structure component. However, in actual application scenarios, some places need to be observed parallel to the pipeline, while some places need to be observed perpendicular to the pipeline or at other angles. The traditional design causes the relative angle between the sensor display and the sampling port of the detection structure component to be fixed, which makes it difficult to adapt to the need to adjust the angle for convenient observation. Summary of the Invention

[0005] In response to the deficiencies in the structural design of the detection components for the above-mentioned bidirectional dynamic pressure measurement sensor, the present invention proposes a rotating mechanism for a bidirectional dynamic pressure measurement sensor. The mechanism is small in size and low in complexity, with a compact structure and good stability, and can meet the need for the electrical main body of the sensor to rotate relative to the detection structural components.

[0006] According to an embodiment of the present invention, a rotating mechanism for a bidirectional dynamic pressure measuring sensor is provided, which is characterized in that it comprises: a connecting seat (1), the upper part of which is used to connect a fluid pressure sensor; a cavity (2), the top of which is fixed to the bottom of the connecting seat (1); a sampling component (5), the top of which is movably connected to the bottom of the cavity (2), so that the sampling component (5) can rotate in the horizontal direction relative to the cavity (2), wherein a vertical partition (3) is provided in the cavity (2) for dividing the interior of the cavity (2) into two isolated parts, and the sampling component (5) is fixed with two guide tubes (4) in the vertical direction, the upper ends of the guide tubes (4) respectively extend into one of the two parts of the cavity (2), and the lower ends of the guide tubes (4) are respectively connected to the fluid pressure sampling ports.

[0007] According to an embodiment of the present invention, the bottom of the cavity (2) has two arc-shaped rotation holes (7) for allowing the guide tube (4) to extend therein and enable the guide tube (4) to rotate as a whole in the horizontal direction together with the sampling component (5) and the fluid pressure sampling port.

[0008] According to an embodiment of the present invention, the rotating mechanism for the bidirectional dynamic pressure measurement sensor further comprises: a fastening plate (6) for fixing the sampling component (5) to the bottom of the cavity (2) when the sampling component (5) is rotated to a specific position in the horizontal direction relative to the cavity (2).

[0009] According to an embodiment of the present invention, two through holes are opened in the connecting seat (1), and the lower end of each through hole is connected to one of the two parts of the cavity (2).

[0010] According to an embodiment of the present invention, the fluid pressure sampling port is formed by a Pitot tube having two openings. The cross sections of the two openings are vertical, parallel to each other and in opposite directions.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] 1. The relative rotation between the sampling component and the cavity is achieved through the guide tube and the limited rotation hole (rotation groove), and the axial rotation is achieved without the need for a rotating shaft, making the entire rotating mechanism simple in structure and easy to produce;

[0013] 2. The rotation path formed by the guide tube and the limited rotation hole is a natural connection path between the sampling component and the cavity. The rotation is smooth and reliable, and can meet the needs of different angles.

[0014] 3. It not only realizes rotation but also limits the range of rotation angle. It forms two extreme rotation angles through a simple structure, which is highly practical.

[0015] 4. The structure is simple and compact, which is not only convenient for installation and debugging, but also convenient for the application of various sensors such as static pressure, differential pressure, flow rate, flow rate, etc. based on the dynamic pressure measurement principle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention;

[0017] Figure 2 A cross-sectional view of a cavity of a rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention;

[0018] Figure 3 A schematic structural diagram of a rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention when operating at a horizontal angle;

[0019] Figure 4 Schematic diagram of the structure of a rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention when working at a vertical angle. DETAILED DESCRIPTION

[0020] Below, the implementation of the technical solution is further described in detail with reference to the accompanying drawings.

[0021] Those skilled in the art will appreciate that although the following description involves numerous technical details regarding the embodiments of the present invention, these are merely examples to illustrate the principles of the present invention and are not intended to limit the present invention in any way. The present invention is applicable to situations other than those described below, as long as they do not deviate from the principles and spirit of the present invention.

[0022] In addition, in order to avoid making the description of this specification too redundant, some technical details that can be obtained from existing technical materials may be omitted, simplified, modified, etc. in the description of this specification. This is understandable to those skilled in the art and will not affect the sufficiency of the disclosure of this specification.

[0023] The rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention primarily comprises: a connecting base, a cavity, a sampling component, and a fastening plate. The connecting base is mounted on the sensor body, the cavity is fixed to the connecting base, and the protruding portion at the top of the sampling component is a guide tube, which extends into a limited rotation hole / rotation groove at the bottom of the cavity. The sampling component is connected and fixed to the cavity by a fastening plate. A partition in the cavity divides the cavity into two, forming a symmetrical dual-path detection path transition cavity. The two limited rotation holes are two symmetrical arcs on the same circumference, with an arc angle of γ. The two guide tubes on the sampling component are symmetrical, with a center-to-center distance that matches the diameter of the rotation hole arcs. The guide tube outer diameter matches the width of the rotation hole, and the sampling component is concentric with the cavity. During rotation, the guide tube at the top of the sampling component moves relative to the limited rotation hole at the bottom of the cavity. The arcs of the two symmetrical rotation holes form a rotation path, and the arc angle γ of the limited rotation hole forms the rotation limit angle.

[0024] Figure 1 Schematic diagram of the structure of a rotating mechanism for a bidirectional dynamic pressure measurement sensor according to an embodiment of the present invention.

[0025] Specifically, if Figure 1 As shown, the rotation mechanism includes: a connecting seat 1, which is connected to the main body of the sensor; a cavity 2, which is fixed to the connecting seat 1; a sampling component 5, which forms a relatively rotatable joint with the cavity 2 through a guide tube 4 and is connected to the cavity by a fastening plate 6. Among them, the cavity 2 is provided with a partition 3, which divides the cavity 2 into two to form two detection paths. A limit rotation hole 7 is provided at the bottom of the cavity 2. The top of the sampling component 5 is a protruding guide tube 4. The limit rotation hole 7 is geometrically symmetrical with the two guide tubes 4, with the same axis and radius. The arc angle (length) of the limit rotation hole 7 determines the rotation angle range of the rotation mechanism. Two through holes are opened in the connecting seat 1, and the lower ends of the through holes are respectively connected to one of the two parts of the cavity (2).

[0026] This rotating mechanism serves as a detection and sampling structural component and, in conjunction with a pressure measuring device, can realize the measurement of bidirectional static pressure, positive pressure, negative pressure, and differential pressure based on dynamic pressure measurement. It can also be equipped with a Pitot tube to directly measure the flow velocity and flow rate of the fluid in both positive and negative directions.

[0027] A typical embodiment is to equip the rotating mechanism with an S-type pitot tube (fluid pressure measuring device / sampling port) to measure the wind speed in the pipeline or mine tunnel. The S-type pitot tube is welded by two metal tubes with the same appearance and opposite sampling ports. The sampling head has two openings in opposite directions, and the two opening cross sections are parallel. During measurement, the opening facing the direction of the airflow is called the total pressure port, which measures the equivalent total pressure, and the opening facing away from the direction of the airflow is called the static pressure port, which measures the equivalent static pressure. The difference between the total pressure and the static pressure is the dynamic pressure. The measurement principle is: the two ends of the total pressure tube and the static pressure tube are respectively connected to the two ends of the U-shaped pressure gauge. The gas density is The density of the liquid in the manometer is From the Bernoulli equation we get:

[0028]

[0029] Where: v is air velocity, m / s; p is the differential pressure value of the Pitot tube, Pa; —Fluid density, kg / m 3 ; K—Pitot tube coefficient, the S-type Pitot tube system is 0.81~0.86.

[0030] Taking into account The streamline is not straight and the need for practical engineering applications can be transformed into formula (1):

[0031]

[0032] Therefore, by measuring the differential pressure in the positive and negative directions, the wind speed can be measured, where the positive or negative value of the v value reflects the direction of the wind flow. In practical applications, for easy observation, the sensor display window in pipelines should generally be parallel to the airflow direction, while the sensor display window in mine tunnels should generally be perpendicular to the airflow direction.

[0033] Since the display direction of the sensor is constant relative to the cavity 2, the rotation mechanism changes the angle between the display direction of the sensor and the sampling port (for example, the sampling port of the pitot tube connected to the sampling component 5) by rotating the sampling component 5 relative to the cavity 2. At this time, first rotate and loosen the fastening plate 6, then make the sampling component 5 and the cavity 2 rotate relative to each other along the path of the limited rotation hole 7, that is, obtain the corresponding angle α, and finally tighten the fastening plate 6 to fix it before proceeding to the next step. Specifically, it includes the following two working states:

[0034] 1) The sensor display is parallel to the sampling port axis of the sampling component, such as Figure 3 As shown, the two guide tubes 4 at the top of the sampling component 5 are in the a-a' position of the limit rotation hole 7. At this time, the axes of the two sampling ports of the sampling component 5 are parallel to the flow direction of the fluid, and the sensor display is also parallel to the fluid direction. The extreme angle of the limit rotation hole 7 plays a limiting role, ensuring that the above three are parallel in pairs, that is, β = 180°. This angle is suitable for scenarios that require observation from the side of the detection channel.

[0035] 2) The sensor display is perpendicular to the sampling port axis of the sampling component, such as Figure 4 As shown, the sampling component 5 is rotated so that the two guide tubes 4 are in the b-b' position of the limited rotation hole 7. At this time, the axes of the two sampling ports of the sampling component 5 are ensured to be parallel to the flow direction of the fluid. Then, the sensor display is perpendicular to the fluid direction, that is, α = 90°. This angle is suitable for scenarios where observation from the detection channel in the forward direction is required.

[0036] Finally, those skilled in the art will appreciate that various modifications, variations, and substitutions can be made to the above-described embodiments of the present invention, all of which fall within the scope of protection of the present invention as defined by the appended claims.

Claims

1. A rotating mechanism for a bidirectional dynamic pressure measuring sensor, characterized in that include: A connecting seat (1), the upper portion of which is used to connect a fluid pressure sensor; A cavity (2), the top of which is fixed to the bottom of the connecting seat (1); The sampling component (5) has a top that is movably connected to the bottom of the cavity (2), so that the sampling component (5) can rotate in a horizontal direction relative to the cavity (2). A vertical partition (3) is provided in the cavity (2) for dividing the interior of the cavity (2) into two mutually isolated parts. The sampling component (5) has two guide tubes (4) fixed in the vertical direction, the upper ends of the guide tubes (4) respectively extend into one of the two parts of the cavity (2), and the lower ends of the guide tubes (4) are respectively connected to the fluid pressure sampling ports. The bottom of the cavity (2) is provided with two arc-shaped rotating holes (7) for allowing the guide tube (4) to extend therein and for enabling the guide tube (4) to rotate together with the sampling component (5) and the fluid pressure sampling port in a horizontal direction as a whole. The rotating mechanism for the bidirectional dynamic pressure measurement sensor further comprises: A fastening plate (6) is used to fix the sampling component (5) to the bottom of the cavity (2) when the sampling component (5) is rotated to a specific position in the horizontal direction relative to the cavity (2).

2. The rotating mechanism for a bidirectional dynamic pressure measuring sensor according to claim 1, characterized in that: The connection seat (1) has two through holes, and the lower end of each through hole is connected to one of the two parts of the cavity (2).

3. The rotating mechanism for a bidirectional dynamic pressure measuring sensor according to claim 1, characterized in that: The fluid pressure sampling port is composed of a Pitot tube having two openings. The cross sections of the two openings are vertical, parallel to each other and in opposite directions.

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