Pressure difference measuring device

Abstract

The invention relates to the technical field of fluid pressure measuring equipment, in particular to a pressure difference measuring device which comprises a valve body, a fixed plate and a rotating plate are arranged in the valve body, n large holes and n small holes are correspondingly formed in the fixed plate and the rotating plate, a fixed shaft is arranged on the fixed plate, the rotating plate is rotatably installed on the fixed shaft, and n is larger than or equal to 1. A torsional spring for resetting is arranged between the rotating plate and the fixed shaft; a plurality of raised blades are arranged on the plate surface of the rotating plate; fluid in the valve body impacts the blades to drive the rotating plate to rotate so that the large holes in the fixed plate and the rotating plate can be communicated and the small holes in the rotating plate can be closed, or the torsional spring enables the rotating plate to reset so that the large holes in the fixed plate and the rotating plate can be closed and the small holes in the fixed plate and the rotating plate can be communicated.

Description

Technical Field

[0001] The invention relates to the technical field of fluid pressure measuring equipment, in particular to a pressure difference measuring device. Background Art

[0002] Pressure instruments are installed on fluid pipelines to measure pressure or pressure difference of the fluid to monitor the status of the pipeline and the fluid. However, in industries such as petrochemicals, the range of the pressure instrument is within a certain range, but the actual pressure fluctuations of the fluid are large, causing the pressure instrument to be subjected to a large impact and inaccurate pressure difference measurement. For example, a pressure gauge used to measure small pressures or pressure differences can easily cause damage to the pipeline, its valve body, instrument, etc. if the pressure increases. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a pressure difference measuring device, which is provided with two matching orifice plates, and can adaptively adjust the opening of the orifice plates according to the pressure of the fluid itself, so as to cope with pressure fluctuations and reduce the impact on the pressure instrument. The technical solution adopted by the present invention is as follows: A pressure difference measuring device, comprising a valve body, wherein a fixed plate and a rotating plate are arranged in the valve body, wherein n large holes and n small holes are arranged on the fixed plate and the rotating plate respectively, wherein a fixed shaft is arranged on the fixed plate, wherein the rotating plate is rotatably mounted on the fixed shaft, wherein a torsion spring for resetting is arranged between the rotating plate and the fixed shaft, and wherein a plurality of protruding blades are arranged on the plate surface of the rotating plate; The fluid in the valve body impacts the blades to drive the rotating plate to rotate so that the large holes on the fixed plate and the rotating plate are connected and the small holes are closed, or the torsion spring resets the rotating plate so that the large holes on the fixed plate and the rotating plate are closed and the small holes are connected.

[0004] In the above-mentioned pressure difference measuring device, at least one limiting groove I is provided on the plate surface of the fixed plate, at least one limiting groove II is provided on the plate surface of the rotating plate corresponding to the limiting groove I, and a positioning ball is provided between the limiting groove I and the limiting groove II.

[0005] In the pressure difference measuring device, a bearing is further provided between the rotating plate and the fixed shaft, and an end cover is used to press and seal the end of the fixed shaft.

[0006] In the pressure difference measuring device, each of the blades is arranged one by one on the rotating plate near the large hole.

[0007] In the pressure difference measuring device, the large holes are distributed away from the center of the orifice plate, and the small holes are distributed close to the center of the orifice plate.

[0008] The pressure difference measuring device further comprises an angle sensor, wherein the angle sensor is used to measure the rotation angle θ of the rotating plate, and 0≤θ≤π / 2n; The calculation formula of the connection area S between the fixed plate and the rotating plate is as follows: ; In the above formula: r1 is the radius of the large hole of the fixed plate or rotating plate; r2 is the radius of the small hole of the fixed plate or rotating plate.

[0009] Beneficial effects of the present invention: The device is provided with a fixed plate and a rotating plate. The rotating plate relies on the impact of the fluid and the action of the reset torsion spring to adjust the opening according to the pressure of the fluid, so that the opening can be adjusted according to the pressure in the pipeline. The pressure difference can be stably measured, thereby stably monitoring the state of the pipeline or fluid and avoiding impact on the pipeline or pressure instrument caused by large fluctuations in fluid pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 A schematic cross-sectional view of an embodiment of the present invention; Figure 3 Schematic diagram of the explosion of two orifice plate structures according to an embodiment of the present invention Figure 1 ; Figure 4 Schematic diagram of the explosion of two orifice plate structures according to an embodiment of the present invention Figure 2 ; Figure 5 Schematic diagram of the process change of the orifice plate from small holes connected to large holes connected in an embodiment of the present invention (the gray area indicates no connection).

[0011] In the figure: 1 is a fixed plate, 2 is a rotating plate, 3 is a large hole, 4 is a small hole, 5 is a torsion spring, 6 is a bearing, 7 is an end cover, 8 is a ball, 11 is a fixed shaft, 12 is a limit groove I, 21 is a blade, 22 is a limit groove II, and 23 is an angle sensor. DETAILED DESCRIPTION

[0012] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings. The following embodiments are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical terms used have the same meanings as those commonly understood by those skilled in the art to which the present application belongs. It should be noted that the terms used are only for describing specific embodiments and are not intended to limit the present application.

[0013] This embodiment is a pressure difference measuring device, such as Figures 1 to 5 As shown, it includes a valve body 9, in which a fixed plate 1 and a rotating plate 2 are provided. The fixed plate 1 and the rotating plate 2 are respectively provided with n large holes 3 and n small holes 4, wherein the large holes 3 are distributed away from the center of the orifice plate, and the small holes 4 are distributed close to the center of the orifice plate. In this embodiment, n=4.

[0014] Combination Figures 2 to 4 A fixed shaft 11 is provided on the fixed plate 1, and the rotating plate 2 is rotatably installed on the fixed shaft 11. A torsion spring 5 and a bearing 6 for resetting are provided between the rotating plate 2 and the fixed shaft 11. The end of the fixed shaft 11 is pressed and sealed with an end cover 7. The sealing and installation between the two orifice plates and the end cover 7 can adopt conventional existing technologies, and there are no technical obstacles.

[0015] Furthermore, four raised blades 21 are provided on the surface of the rotating plate 2. Specifically, each blade 21 is located on the rotating plate 2 and is arranged one by one close to the large hole 3. The shape of the blade 21 can be similar to a turbine blade, etc., and the rotating plate 2 can rotate when subjected to force.

[0016] Furthermore, in order to limit the rotation of the rotating plate 2 within a certain range and avoid continuous rotation when the pressure fluctuates, at least one limit groove Ⅰ12 is provided on the plate surface of the fixed plate 1, and at least one limit groove Ⅱ22 is provided on the plate surface of the rotating plate 2 corresponding to the limit groove Ⅰ12. A positioning ball 8 is provided between the limit groove Ⅰ12 and the limit groove Ⅱ22. By setting the matching length of the limit groove Ⅰ12 and the limit groove Ⅱ22, the rotation range of the rotating plate 2 is limited to between the connection of the large hole 3 and the connection of the small hole 4.

[0017] The device is also provided with an angle sensor 23, which is used to measure the rotation angle θ of the rotating plate 2. The angle sensor is an existing product, which is installed on the valve body 9 and the rotating plate 2, and 0≤θ≤π / 8. When θ=0, the small hole 4 between the fixed plate 1 and the rotating plate 2 is completely connected and the large hole 3 is completely closed. When θ=π / 8, the large hole 3 between the fixed plate 1 and the rotating plate 2 is completely connected and the small hole 4 is completely closed. The calculation formula of the communication area S between the fixed plate 1 and the rotating plate 2 is as follows: ; In the above formula: r1 is the radius of the large hole 3 of the fixed plate 1 or the rotating plate 2; r2 is the radius of the small hole 4 of the fixed plate 1 or the rotating plate 2.

[0018] The working principle of the device is: when the fluid pressure in the valve body 9 increases, the fluid generates an impact force on the blade 21, driving the rotating plate 2 to rotate so that the large holes 3 on the fixed plate 1 and the rotating plate 2 are gradually connected and the small holes 4 are gradually closed, so that it can adapt to the measurement of high-pressure fluids. During the rotation of the rotating plate 2, the effective connection area between the large hole 3 and the small hole 4 is changing. The angle sensor 23 is used to measure the rotation angle θ, and the effective connection area can be obtained in real time through the above formula; when the fluid pressure in the valve body 9 decreases, the impact force on the blade 21 is not enough to keep the large hole 3 connected. Under the reset action of the torsion spring 5, the rotating plate 2 rotates to gradually close the large hole 3 on the rotating plate 2 and the fixed plate 1, and the small hole 4 is gradually connected, so that it can adapt to the measurement of low-pressure fluids. When in use, the pressure gauge is connected to the pipelines near both sides of the device respectively or the differential pressure transmitter is directly connected to realize the measurement of the pressure difference. By observing the pressure difference data, the state of the fluid can be known, avoiding the impact of sudden pressure changes on pipelines, pressure instruments or valve bodies, etc., and improving the safety of fluid transportation.

[0019] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several changes or improvements can be made without departing from the principles of the present application. These changes or improvements should also be regarded as the scope of protection of the present application.

Claims

1. A pressure difference measuring device, comprising a valve body (9), characterized in that: The valve body (9) is provided with a fixed plate (1) and a rotating plate (2), and the fixed plate (1) and the rotating plate (2) are provided with n large holes (3) and n small holes (4) respectively, the fixed plate (1) is provided with a fixed shaft (11), the rotating plate (2) is rotatably mounted on the fixed shaft (11), a torsion spring (5) for resetting is provided between the rotating plate (2) and the fixed shaft (11), and a plurality of protruding blades (21) are provided on the plate surface of the rotating plate (2); The fluid in the valve body (9) impacts the blade (21) to drive the rotating plate (2) to rotate so that the large holes (3) on the fixed plate (1) and the rotating plate (2) are connected and the small holes (4) are closed, or the torsion spring (5) resets the rotating plate (2) so that the large holes (3) on the fixed plate (1) and the rotating plate (2) are closed and the small holes (4) are connected.

2. The pressure difference measuring device according to claim 1, characterized in that: At least one limiting groove I (12) is provided on the plate surface of the fixed plate (1), and at least one limiting groove II (22) is provided on the plate surface of the rotating plate (2) corresponding to the limiting groove I (12), and a positioning ball (8) is provided between the limiting groove I (12) and the limiting groove II (22).

3. The pressure difference measuring device according to claim 1, characterized in that: A bearing (6) is also provided between the rotating plate (2) and the fixed shaft (11), and an end cover (7) is used to compress and seal the end of the fixed shaft (11).

4. The pressure difference measuring device according to claim 1, characterized in that: Each blade (21) is arranged on the rotating plate (2) in a one-to-one correspondence close to the large hole (3).

5. The pressure difference measuring device according to claim 1, characterized in that: The large holes (3) are distributed away from the center of the orifice plate, and the small holes (4) are distributed close to the center of the orifice plate.

6. The pressure difference measuring device according to claim 1, characterized in that: It also includes an angle sensor (23), wherein the angle sensor (23) is used to measure the rotation angle θ of the rotating plate (2), and 0≤θ≤π / 2n; The calculation formula for the connection area S between the fixed plate (1) and the rotating plate (2) is as follows: ； In the above formula: r1 is the radius of the large hole (3) of the fixed plate (1) or the rotating plate (2); r2 is the radius of the small hole (4) of the fixed plate (1) or the rotating plate (2).

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