Micro-differential-pressure buffering device

Abstract

The utility model discloses a micro differential pressure buffer device, which relates to the field of differential pressure measurement and comprises a closed box body, a pressure tap is arranged on one side of the box body, an annular pressure stabilizing plate is arranged in the box body, two sides of the pressure stabilizing plate are contacted with the inner walls of two sides of the box body, an opening is arranged on the pressure stabilizing plate, the pressure tap is positioned in the pressure stabilizing plate, and the box body is communicated with a pressure measuring port. And the pressure measuring port is positioned outside the pressure stabilizing plate. According to the utility model, the influence of dynamic pressure fluctuation and instantaneous pressure fluctuation on the measurement result can be reduced, so that the measured result can accurately reflect the variation trend of the environmental pressure difference.

Description

Technical Field

[0001] The utility model relates to the field of differential pressure measurement, in particular to a micro differential pressure buffer device. Background Art

[0002] With the development of industrial product manufacturing industry, industrial products and electronic products have higher and higher requirements for production environment. The production environment is closely related to product quality. A suitable production environment can improve product performance, yield and stability. Industrial products and electronic products have more and more stringent requirements for air cleanliness, temperature and humidity, static electricity, pressure difference, etc. In actual production, with the development of detection methods, the detection results of cleanliness, temperature and humidity, static electricity, etc. are more real and stable, but the pressure difference is not only affected by the environment, but also by the fan body, air duct, eddy current, air outlet, return air outlet, etc., resulting in large fluctuations in the micro pressure gauge in actual application. Even when no changes are found in the production environment, the pressure difference also fluctuates greatly. Generally, the micro pressure difference sensor collects data at certain points, and there is a phenomenon of distortion of the measurement results when the dynamic pressure and pressure fluctuate instantaneously. Utility Model Content

[0003] The utility model provides a micro-pressure difference buffer device, which is used to solve the problem of distortion of existing pressure difference measurement results.

[0004] A micro-pressure difference buffer device comprises a sealed box body, a pressure taking port is provided on one side of the box body, an annular voltage stabilizing plate is arranged in the box body, two sides of the voltage stabilizing plate are in contact with two inner walls of the box body, an opening is provided on the voltage stabilizing plate, the pressure taking port is located inside the voltage stabilizing plate, and the box body is connected to a pressure measuring port, which is located outside the voltage stabilizing plate.

[0005] Furthermore, there are several stabilizing plates, which are arranged in sequence from the inside to the outside. And as the volume of the stabilizing chamber at the back becomes larger and larger, the speed at which the pressure in the stabilizing chamber rises will also become slower.

[0006] Furthermore, the openings formed on the plurality of voltage stabilizing plates are staggered with each other.

[0007] Furthermore, the voltage stabilizing plate is in a circular ring shape.

[0008] Furthermore, the plurality of voltage stabilizing plates are concentric.

[0009] Furthermore, there are multiple pressure tapping ports.

[0010] Furthermore, a fixing block is arranged on the outer wall of the box body.

[0011] The utility model can reduce the influence of dynamic pressure fluctuation and instantaneous pressure fluctuation on the measurement result, so that the measured result can accurately reflect the change trend of the environmental pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 or the description of the prior art 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.

[0013] Figure 1 It is the front view of the utility model;

[0014] Figure 2 It is a cross-sectional view of the utility model.

[0015] In the figure: 1. pressure taking port; 2. fixing block; 3. pressure measuring port; 4. box body; 5. voltage stabilizing plate; 8. voltage stabilizing chamber. DETAILED DESCRIPTION

[0016] See also Figure 1-2 As shown, a micro-pressure difference buffer device includes a sealed box body 4, a pressure port 1 is provided on one side of the box body 4, an annular pressure stabilizing plate 5 is arranged inside the box body 4, the two sides of the pressure stabilizing plate 5 are in contact with the inner walls of the two sides of the box body 4, an opening is provided on the pressure stabilizing plate 5, the pressure port 1 is located inside the pressure stabilizing plate 5, the box body 4 is connected to the pressure measuring port 3, and the pressure measuring port 3 is located outside the pressure stabilizing plate 5. The pressure port 1 is a small hole connecting the utility model and the pressure taking point (when used for duct pressure measurement, the pressure port 1 can be changed to the same structure as the pressure measuring port 3). When the gas passes through the pressure port 1, the dynamic pressure of the horizontal airflow will not be converted into static pressure. Since the utility model is installed on the wall, the vertical airflow is relatively small, so the pressure port can reduce the influence of most turbulence on the detection result. The cavity inside the pressure stabilizing plate 5 is a pressure stabilizing chamber 8, and the gas enters the pressure stabilizing chamber 8 through the pressure port 1, and then enters the pressure measuring port 3 through the pressure stabilizing chamber 8.

[0017] When the external gas surges, the flow entering the micro-pressure difference buffer may be turbulent. One function of the pressure stabilizing plate 5 is to convert the turbulent gas convection of the pressure taking hole into laminar flow. When the pressure is transmitted to the pressure measuring port 3, the dynamic pressure of the gas is basically 0, so the pressure stabilizing plate 5 and the pressure stabilizing chamber 8 formed by it basically solve the influence of dynamic pressure on the measurement result. Another function of the pressure stabilizing plate 5 is to alleviate the influence of the air pressure fluctuation outside the pressure taking port 1 on the pressure detection result of the pressure measuring port 3. When the external air pressure of the pressure taking hole 1 increases instantly for some reason, the gas outside the pressure taking hole 1 is converted from static pressure to dynamic pressure. When the gas flows into the pressure stabilizing chamber 8, the gas begins to be converted from dynamic pressure to static pressure. The pressure in the pressure stabilizing chamber 8 becomes larger due to the static pressure, and begins to form a pressure difference with the outside of the pressure stabilizing chamber 8. When the gas flows out of the pressure stabilizing chamber 8 from the opening opened on the pressure stabilizing plate 5, the gas begins to be converted from dynamic pressure to static pressure. The airflow through the opening is small, which prolongs the time for the pressure rise in the pressure stabilizing chamber 8. In addition, as the pressure difference between the pressure stabilizing chamber 8 and the pressure taking hole 1 is getting smaller and smaller, the pressure in the pressure stabilizing chamber 8 rises slowly. After being buffered by the pressure stabilizing chamber 8, the pressure at the pressure measuring port 3 rises much more slowly. Since the air pressure outside the pressure taking hole 1 rises instantaneously, the air pressure outside the pressure taking hole 1 starts to drop just after the pressure at the pressure measuring port 3 rises a little. Based on the same principle, the pressure at the pressure measuring port 3 also starts to drop slowly. If the increase or decrease in the external pressure does not occur instantaneously, the pressure at the pressure measuring port 3 will also change slowly to be consistent with the external pressure.

[0018] The pressure of the pressure measuring port 3 is less affected by the dynamic pressure and the instantaneous fluctuation of the air pressure outside the pressure taking hole 1. When the differential pressure sensor is connected to the pressure measuring port 3, a pressure curve that eliminates external interference can be obtained, which is convenient for judging the real situation of the environment. Therefore, the utility model can reduce the influence of dynamic pressure fluctuations and instantaneous pressure fluctuations on the measurement results, so that the measured results can accurately reflect the changing trend of the environmental pressure difference. If the increase or decrease of the external pressure does not occur instantaneously, the pressure of the pressure measuring port 3 will also slowly change to be consistent with the external pressure. The pressure of the pressure measuring port 3 is less affected by the dynamic pressure and the instantaneous fluctuation of the air pressure outside the pressure taking hole 1. When the differential pressure sensor is connected to the pressure measuring port 3, a pressure curve that eliminates external interference can be obtained, which is convenient for judging the real situation of the environment, thereby reducing the influence of dynamic pressure fluctuations and instantaneous pressure fluctuations on the measurement results, so that the measured results can accurately reflect the changing trend of the environmental pressure difference.

[0019] There are several pressure stabilizing plates 5, which are arranged in sequence from the inside to the outside. The cavity between adjacent pressure stabilizing plates 5 is a pressure stabilizing cavity 8. As the volume of the pressure stabilizing cavity 8 located outside becomes larger and larger, the speed at which the pressure rises in the pressure stabilizing cavity 8 located outside will also become slower, thereby further reducing the influence of dynamic pressure fluctuations and instantaneous pressure fluctuations on the measurement results, so that the measured results can accurately reflect the changing trend of the environmental pressure difference.

[0020] The openings on the plurality of pressure stabilizing plates 5 are staggered with each other. This structure can prolong the time for the pressure in the pressure stabilizing chamber 8 to rise, and further reduce the influence of dynamic pressure fluctuation and instantaneous pressure fluctuation on the measurement result.

[0021] The pressure stabilizing plate 5 is in the shape of a ring. The ring-shaped pressure stabilizing plate 5 has no dead angle and is more conducive to reducing dynamic pressure fluctuations and instantaneous pressure fluctuations.

[0022] The plurality of voltage stabilizing plates 5 are concentric.

[0023] There are multiple pressure tapping ports 1.

[0024] A fixing block 2 is arranged on the outer wall of the box body 4. The fixing block 2 facilitates the box body 4 to be fixed on the wall.

[0025] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A micro-pressure difference buffer device, characterized in that: The invention comprises a sealed box body (4), a pressure taking port (1) is provided on one side of the box body (4), an annular pressure stabilizing plate (5) is arranged inside the box body (4), two sides of the pressure stabilizing plate (5) are in contact with the inner walls of two sides of the box body (4), an opening is provided on the pressure stabilizing plate (5), the pressure taking port (1) is located inside the pressure stabilizing plate (5), the box body (4) is connected to a pressure measuring port (3), and the pressure measuring port (3) is located outside the pressure stabilizing plate (5).

2. A micro-pressure difference buffer device according to claim 1, characterized in that: There are a plurality of voltage stabilizing plates (5), and the plurality of voltage stabilizing plates (5) are arranged in sequence from the inside to the outside.

3. A micro-pressure difference buffer device according to claim 2, characterized in that: The openings formed on the plurality of voltage stabilizing plates (5) are staggered with each other.

4. A micro-pressure difference buffer device according to claim 2, characterized in that: The voltage stabilizing plate (5) is in the shape of a circular ring.

5. A micro-pressure difference buffer device according to claim 4, characterized in that: The plurality of voltage stabilizing plates (5) are concentric.

6. A micro-pressure difference buffer device according to claim 1, characterized in that: There are multiple pressure taking ports (1).

7. A micro-pressure difference buffer device according to claim 1, characterized in that: A fixing block (2) is arranged on the outer wall of the box body (4).

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