Rectification structure for differential pressure sensor

Abstract

The utility model provides a rectification structure for a differential pressure type sensor, which comprises a fixing piece, a rectification piece, a rectification piece and a rectification piece, and is characterized in that one side of the fixing piece is provided with a baffle; at least one group of fixing pieces are arranged and are positioned in a base flow channel of the differential pressure type sensor; and at least one rectifying structure is arranged, is positioned in the base flow channel, and rectifies the fluid in the base flow channel. When the rectification structures work, the rectification structures are installed at the two ends of the base flow channel respectively and rectify inflow / outflow air flow, so that the inflow / outflow air flow can flow stably, and the situation that errors or deviation exists in metering due to instantaneous air flow fluctuation when the differential pressure type sensor flowmeter conducts flow metering is reduced; therefore, the problem that air flow of a conventional differential pressure type flow meter forms pressure difference in a fluid channel, and the pressure difference affects the stability of the air flow is solved. Therefore, the problem that the instantaneous fluctuation condition of the fluid in the airflow channel due to the structural design affects the metering result is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of airflow rectification in a differential pressure flow meter, in particular to a rectification structure for a differential pressure sensor. Background Art

[0002] The differential pressure flowmeter is based on the throttling principle of fluid flow, and uses the pressure difference generated when the fluid flows through the throttling device to achieve flow measurement. It is one of the most mature and commonly used methods for measuring flow in production. It is usually composed of a throttling device that can convert the measured flow into a pressure difference signal, a differential pressure gauge that can convert the pressure difference into a corresponding flow value for display, and a display instrument. In the unit combination instrument, the pressure difference signal generated by the throttling device is often converted into a corresponding standard signal (electrical or pneumatic) through a differential pressure transmitter for display, recording or control.

[0003] At present, differential pressure flowmeters are used in processes. Due to the differences in the inner diameter and length of the fluid channel, as well as the differences in the fluid flow rate and velocity, there are often fluctuations in the instantaneous flow rate in the fluid channel during actual operation, which in turn affects the measurement accuracy of the flowmeter.

[0004] In the existing technology, the solution to the above problem is the technical solution disclosed in Chinese patent CN220649640U: a rectifying assembly, a flow meter, a rectifying device and a flow meter device, wherein the rectifying assembly is used to be arranged inside the fluid flow channel, and the rectifying assembly includes a first rectifying part and a flow guide cover. Along the first direction, the rectifying assembly has a first end and a second end, the closed end of the flow guide cover is close to the first end, and the opening of the flow guide cover is close to the second end. One end of the first rectifying part is arranged inside the flow guide cover. Along the second direction, there is a first gap between the flow guide cover and the inner wall of the fluid flow channel, and there is a second gap between the flow guide cover and the first rectifying part. The area where the first gap is located is connected to the area where the second gap is located through the opening of the flow guide cover. The flow guide cover includes a flow guide portion, which extends along the first direction and is close to the first end. The first gap at least includes the gap between the flow guide portion and the inner wall of the fluid flow channel in the second direction. The path of the fluid in the fluid flow channel through the rectification component: from the first end toward the second end, the fluid enters the interior of the first gap under the wind flow of the guide part, and then enters the interior of the second gap through the opening of the guide cover. Among them, the path of the fluid in the rectification component is similar to an S-shape, which makes the distance the fluid moves longer, so that the fluid morphology can be fully sorted, and the impact of external pressure fluctuations on the fluid can also be reduced. In addition, the phenomenon of fast center flow velocity and slow edge flow velocity in the flow field can be reduced by the diversion of the guide part. In addition, the vortex phenomenon of the fluid in the flow field can be reduced by the rectification of the first rectification component. Therefore, the rectification component provided in the embodiment of the present application can achieve effective sorting of the flow field, so that the flow field entering the metering section is stable and uniform, so as to improve the metering accuracy.

[0005] Although the above-mentioned patent solves the problem of errors in flow meter measurement caused by partial fluid instability, in actual application, when the above-mentioned scheme is rectified by the first rectifying part of the cylindrical structure, a pressure difference will be formed because the airflow is guided by the cylindrical structure in the fluid channel. This pressure difference will affect the stability of the airflow (vortex and uneven cross-sectional flow velocity), and the fluid still has instantaneous fluctuations caused by the structural design in the airflow channel; therefore, there is a lack of a rectifying structure that can solve the above-mentioned problem. Utility Model Content

[0006] The utility model provides a rectifier structure for a differential pressure sensor, which is used to solve the problem that airflow forms a pressure difference in a fluid channel. This pressure difference will affect the stability of the airflow, and the fluid still has instantaneous fluctuations in the airflow channel due to the structural design; and then the measurement result is affected by this instantaneous fluctuation.

[0007] In response to the problems raised by the background technology, the utility model provides the following technical solutions: a rectifying structure for a differential pressure sensor, comprising: a fixing member, one side of which is provided with a baffle; at least one set of the fixing members is provided, and is located in the base flow channel of the differential pressure sensor; at least one rectifying structure is provided, and is located in the base flow channel, and rectifying the fluid in the base flow channel.

[0008] Preferably, a mesh plate is provided on a side of the fixing member away from the baffle, and the fixing member is a ring-shaped structure.

[0009] Preferably, the fixing member is clamped in a structural housing of the differential pressure sensor.

[0010] Preferably, the fixing member is located in a base flow channel of the sensor housing; the base flow channel is formed by a base with a channel.

[0011] Preferably, the fixing member is disposed at both the fluid outlet and the fluid inlet of the base flow channel; and / or the rectifying structure is disposed at both the fluid outlet and the fluid inlet of the base flow channel.

[0012] Preferably, the side of the fixing member with the baffle is arranged at both ends of the base flow channel.

[0013] Preferably, the baffle is evenly distributed with a plurality of small holes, the small holes are circular or regular polygonal in structure, the inner diameter of the small holes is 0.06 times the diameter of the baffle, or less than 0.06 times the diameter of the baffle; the sum of the areas of the small holes is greater than 30% of the cross-sectional area of ​​the mesh plate diameter.

[0014] Preferably, the thickness of the baffle is 1 / 8 of the diameter of the baffle, and the inner wall of the small hole is an outward draft structure.

[0015] Preferably, the mesh plate is any one of a steel mesh plate, a plastic mesh plate or a ceramic mesh plate.

[0016] Preferably, the mesh plate is evenly distributed with a plurality of mesh holes, and the mesh holes are formed by a plurality of line intervals and intersecting vertically and horizontally; the mesh hole diameter is 0.01 times of the mesh plate diameter, or less than 0.01 times of the mesh plate diameter; the wire diameter of the mesh plate is 0.04 times of the mesh plate diameter.

[0017] The working principle and beneficial effects of the utility model are as follows:

[0018] The utility model provides a rectifying structure for a differential pressure sensor, comprising: a fixing member, one side of which is provided with a baffle; at least one set of the fixing members is provided and is located in a base flow channel of the differential pressure sensor; at least one rectifying structure is provided and is located in the base flow channel and rectifying the fluid in the base flow channel.

[0019] When the rectifying structure is working, the rectifying structure is respectively installed at the two ends of the base flow channel, and rectifyes the inflow / outflow airflow, so that the inflow / outflow airflow can flow smoothly, reducing the measurement error or deviation caused by instantaneous airflow fluctuation when the differential pressure sensor flowmeter is measuring the flow; thereby solving the problem that when the conventional differential pressure flowmeter is working, the airflow forms a pressure difference in the fluid channel, and this pressure difference will affect the stability of the airflow; and further solving the problem that the instantaneous fluctuation of the fluid in the airflow channel (base flow channel) caused by the structural design affects the measurement result.

[0020] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures particularly pointed out in the written description and the drawings.

[0021] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0026] Figure 4 This is a schematic diagram of the installation and use position structure of the product of the utility model;

[0027] Figure 5 This is a schematic structural diagram of one embodiment of the baffle of the utility model;

[0028] Figure 6 This is a schematic structural diagram of another embodiment of the baffle of the utility model;

[0029] Figure 7 This is a schematic diagram of the cross-sectional structure of the baffle of the utility model;

[0030] Figure 8 This is an enlarged structural diagram of point A of one embodiment of the baffle of the utility model;

[0031] Fig. 9 This is an enlarged structural schematic diagram of position A of another embodiment of the baffle of the utility model;

[0032] Fig.10 It is a structural schematic diagram of a rectifier flow meter in the prior art;

[0033] Fig.11 A schematic diagram of the structure of a flow meter using the rectifier structure of the utility model;

[0034] Among them, 1-rectification structure, 2-base, 3-end cover, 4-small hole, 5-cut edge, 101-baffle, 102-fixing part, 103-net plate. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0036] according to Figure 1 As shown, an embodiment of the utility model provides a rectifying structure 1 for a differential pressure sensor, comprising: a fixing member 102, wherein a baffle 101 is provided on one side of the fixing member 102; at least one fixing member 102 is provided and is located in a base flow channel of the differential pressure sensor; at least one rectifying structure 1 is provided and is located in the base flow channel, and rectifying the fluid in the base flow channel.

[0037] When the rectifying structure 1 is working, the rectifying structure 1 is respectively installed at the two ends of the base flow channel, and rectify the inflow / outflow airflow, so that the inflow / outflow airflow can flow smoothly, reducing the measurement error or deviation caused by instantaneous airflow fluctuations when the differential pressure sensor flowmeter performs flow measurement; thereby solving the problem that when the conventional differential pressure flowmeter is working, the airflow forms a pressure difference in the fluid channel, and this pressure difference will affect the stability of the airflow; and further solving the problem that the instantaneous fluctuation of the fluid in the airflow channel (base flow channel) caused by the structural design affects the measurement result.

[0038] according to Figure 1-3 As shown, in one embodiment, a mesh plate 103 is provided on a side of the fixing member 102 away from the baffle 101, and the fixing member 102 is a ring-shaped structure.

[0039] In this embodiment, the annular fixed member 102 can guide the fluid, and the fluid enters the base flow channel after being rectified once by the baffle 101, and then guided by the fixed member 102, and rectified twice by the mesh plate 103. When the fixed member 102 and the mesh plate 103 are set as two groups, the secondary rectification is performed in sequence, so that the entire rectification structure 1 can be rectified three times in the base flow channel, thereby further allowing the fluid to flow more smoothly in the base flow channel, and further reducing the instantaneous fluctuation of the metering result caused by structural design problems / base flow channel design problems and the difference between the external fluid pressure and the base flow channel.

[0040] according to Figure 4 As shown, in one embodiment, the fixing member 102 is clamped in the structural housing of the differential pressure sensor. The fixing member 102 is located in the base flow channel of the sensor housing; the base flow channel is formed by a base 2 with a channel. The fixing member 102 is arranged at both the fluid outlet and the fluid inlet of the base flow channel; and / or, the rectifying structure is arranged at both the fluid outlet and the fluid inlet of the base flow channel. The side of the fixing member 102 with the baffle 101 is arranged at both ends of the base flow channel.

[0041] In this embodiment, the baffle 101, the fixing member 102, the mesh plate 103, the fixing member 102, and the mesh plate 103 form a group to form a rectifying structure 1; or, the baffle 101, the fixing member 102, and the mesh plate 103 form a group to form a rectifying structure 1; when in use, the rectifying structure 1 is installed at both ends of the base 2, wherein one side of the baffle 101 of the rectifying structure 1 is close to the outside of the base flow channel of the base 2; and, end covers 3 are installed at both ends of the base 2, and the other end of the end cover 3 is connected to a straight pipe through an adapter, and the straight pipe is used to connect other piping.

[0042] The rectifying structure 1 is fixed to the flow channel of the base by the end cover 3 and the base 2, and rectify the fluid (airflow) in the flow channel of the base. Furthermore, the channel in the base 2, the end cover 3, the adapter, and the straight pipe together form a fluid channel, and the rectifying structure 1 is located in the fluid channel to rectify the fluid, thereby evenly reducing and dispersing the airflow pressure in the fluid channel.

[0043] By placing the rectifying structure 1 at the inlet / outlet of the fluid channel, balanced flow of the fluid input / output can be achieved, thereby reducing fluctuations in metering data caused by fluid turbulence.

[0044] In one embodiment, according to Figure 1-3 As shown in , 5-9, the baffle 101 is evenly distributed with a plurality of small holes 4, the small holes 4 are circular or regular polygonal structures, the inner diameter of the small holes 4 is 0.06 times the diameter of the baffle 101, or less than 0.06 times the diameter of the baffle 101; the sum of the areas of the small holes 4 is greater than 30% of the cross-sectional area of ​​the diameter of the mesh plate 103. The thickness of the baffle 101 is 1 / 8 of the diameter of the baffle 101, and the inner wall of the small holes 4 is an outward drafting structure.

[0045] In this embodiment, the regular polygon is preferably a polygon larger than a hexagon; the outward drafting structure of the inner wall of the small hole 4 is: the cross-sectional diameter or inner diameter of the side facing the fixing member 102 is larger than the cross-sectional diameter or inner diameter of the side away from the fixing member 102. Through the design of this drafting angle, when the airflow enters the rectifying structure 1, it can be forced to be compressed, and then expand with the drafting angle to flow toward the fixing member 102, and then rectified again once or multiple times through the mesh screen 103, thereby achieving the purpose of multi-level rectification.

[0046] By designing the uniform distribution area, size, and thickness of the small holes 4 and optimizing the design in combination with the diameter of the pipe, the inner diameter of the small holes 4 is less than or equal to 0.06 times the diameter of the baffle 101, and the sum of the areas of the small holes 4 is greater than or equal to 30% of the cross-sectional area of ​​the diameter of the mesh plate 103. The thickness of the baffle 101 is 1 / 8 of the diameter of the baffle 101, so that the fluid can pass smoothly and the fluid is evenly divided, so that the rectification effect is optimal when it is used.

[0047] In one embodiment, according to Figure 1-3 , 5-9, the mesh plate 103 is any one of a steel mesh plate 103, a plastic mesh plate 103 or a ceramic mesh plate 103. The mesh plate 103 is evenly distributed with a plurality of mesh holes, which are formed by a plurality of lines that are spaced apart and intersected vertically and horizontally; the mesh hole diameter is 0.01 times the diameter of the mesh plate 103, or less than 0.01 times the diameter of the mesh plate 103; the wire diameter of the mesh plate 103 is 0.04 times the diameter of the mesh plate 103.

[0048] In this embodiment, no matter what material the mesh 103 is made of, by optimizing the design of the mesh 103, the mesh aperture formed by the vertical and horizontal intersections is designed to be equal to or less than 0.01 times the diameter of the mesh 103, and the wire diameter of the mesh 103 is designed to be 0.04 times the diameter of the mesh 103, so that the fluid can pass smoothly and the fluid is evenly divided, so that the rectification effect is optimal when it is used.

[0049] In the utility model, through the rectifying structure 1 provided by the utility model, a stable flow state is the basis for accurate measurement. The function of the rectifying structure 1 is to reduce the airflow vortex and make the axial speed of points at different positions on the pipe cross section tend to be consistent before the airflow passes through the throttling element.

[0050] according to Fig.10 As shown, due to the existence of vortices and uneven cross-sectional flow velocity, in order to ensure measurement accuracy, existing technical flow meters usually need to maintain a straight pipe section of 8-10 times the pipe diameter at the inlet end, which causes the size of the flow meter to be lengthened, thereby increasing the size of the overall flow meter, which is not conducive to structural miniaturization and integrated design.

[0051] according to Figure 1-9 , Fig.11 As shown, in the present invention, a rectifying structure 1 is integrated at both ends of the throttling device. At the same time, the rectifying structure 1 is optimized in terms of key dimensions such as the specific pipe diameter, the aperture of key structural parts, the hole density, and the plate thickness, so that the rectifying structure 1 can achieve the purpose of rectification, and can also enable the straight pipe to achieve effective flow stabilization and rectification when in use, and can also reduce the length of the straight pipe section of the flow meter size, so that it is suitable for more specifications of piping diameters; the purpose of miniaturization and integration of the overall structure of the flow meter is achieved.

[0052] Since the rectifying structures 1 are designed at both ends of the flow channel of the base, the purpose of bidirectional measurement can be achieved, the device has better installability, and the problem of industrial integration is further solved.

[0053] In one embodiment, according to Figure 5 As shown, a cutting edge 5 is provided at one end of the small hole 4, and the cutting edge 5 can beautify the structure and also reduce the influence of burrs generated by punching during the production process on the fluid.

[0054] In one embodiment, the surfaces of the mesh plate 103 and the baffle plate 101 are respectively provided with scale lines, the scale lines are evenly distributed around the outer periphery of the mesh plate 103 and the baffle plate 101, and the scale lines are provided with at least 8; or, the angle between two adjacent scale lines is at most 45 degrees. Correspondingly, the surfaces of both ends of the fixing member 102 are provided with reference lines corresponding to the scale lines, and the reference lines are used to coordinate with the scale lines to adjust the angle of the mesh plate 103 and the baffle plate 101, and to enable the holes of the mesh plate 103 and the baffle plate 101 to be adjusted.

[0055] In this embodiment, by adjusting the corresponding position (angle) of the scale line and the reference line, the hole position of the mesh of the mesh plate 103 and the small hole 4 of the baffle 101 can be further adjusted, and the flow cross section can be further fine-tuned to achieve fine-tuning design of different flow cross sections for different flow meters. Furthermore, in the production process, the flow meter that does not meet the quality inspection can be fine-tuned to meet the quality inspection requirements by adjusting the reference line (rotating the mesh plate 103 and the baffle 101 with the axis of the fixing part 102 as the center) to achieve fine-tuning of the flow cross section.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A rectifier structure for a differential pressure sensor, characterized in that: include: A fixing member, one side of which is provided with a baffle; at least one fixing member is provided and is located in the base flow channel of the differential pressure sensor; at least one rectifying structure is provided and is located in the base flow channel and rectify the fluid in the base flow channel; A mesh plate is arranged on one side of the fixing piece away from the baffle plate, and the fixing piece is a ring-shaped structure.

2. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The fixing piece is clamped in the structural housing of the differential pressure sensor.

3. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The fixing member is located in a base flow channel of the sensor housing; the base flow channel is formed by a base with a channel.

4. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The fixing member is disposed at both the fluid outlet and the fluid inlet of the base flow channel; and / or the rectifying structure is disposed at both the fluid outlet and the fluid inlet of the base flow channel.

5. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The side of the fixing member with the baffle is arranged at two ends of the flow channel of the base.

6. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The baffle is evenly distributed with a plurality of small holes, each of which is a circular or regular polygonal structure, and the inner diameter of each small hole is 0.06 times the diameter of the baffle, or less than 0.06 times the diameter of the baffle; The sum of the areas of the small holes is greater than 30% of the cross-sectional area of ​​the mesh plate diameter.

7. A rectifier structure for a differential pressure sensor as claimed in claim 6, characterized in that: The thickness of the baffle is 1 / 8 of the diameter of the baffle, and the inner wall of the small hole is an outward drafting structure.

8. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The mesh plate is any one of a steel mesh plate, a plastic mesh plate or a ceramic mesh plate.

9. A rectifier structure for a differential pressure sensor as claimed in claim 1, characterized in that: The mesh plate is evenly distributed with a plurality of mesh holes, which are formed by a plurality of lines that are spaced apart and intersect each other vertically and horizontally; the mesh hole diameter is 0.01 times of the mesh plate diameter, or less than 0.01 times of the mesh plate diameter; the wire diameter of the mesh plate is 0.04 times of the mesh plate diameter.

Images