Plug-in bidirectional flow measuring device

Abstract

The utility model discloses a plug-in type two-way flow measuring device which comprises a columnar detection device body, a high-pressure pressure taking pipe and a low-pressure pressure taking pipe, the cross section of the detection device body is oval, and high-pressure holes parallel to the long axis of the oval section are formed in the two sides, with small curvature, of the detection device body. Low-pressure holes parallel to the short axis of the oval section are formed in the two sides, with the large curvature, of the detection device body, the high-pressure holes are communicated with a high-pressure cavity in the detection device body, the low-pressure holes are communicated with a low-pressure cavity in the detection device body, and the high-pressure cavity and the low-pressure cavity are both perpendicular to the oval section. The high-pressure cavity is communicated with a high-pressure pressure taking pipe, and the low-pressure cavity is communicated with a low-pressure pressure taking pipe. By means of the design of the high-pressure cavity and the low-pressure cavity with symmetrical sections, flow in two directions can be measured, the high-pressure hole and the low-pressure hole are designed in a bilateral symmetry mode, differential pressure signals are more stable, the signal-to-noise ratio is larger, and measurement accuracy and stability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas flow measurement, and in particular relates to an insertion-type bidirectional flow measurement device. Background Art

[0002] Industrial pipeline transportation sometimes utilizes bidirectional switching. Conventional flowmeters, typically installed with a fixed flow direction, cannot meet the requirements for bidirectional measurement. Furthermore, flowmeters based on the insertion-type averaging tube principle have low differential pressure sensitivity during measurement. When the flow velocity in the pipeline is low, flow measurement may be impossible or extremely unstable, severely impacting process control in industrial production.

[0003] Among the existing technologies, Chinese utility model patent application number 201721103071X, entitled "A Bidirectional Flow Insertion-Type AB Symmetrical Flowmeter," provides a solution based on the principle of an averaging tube. This solution utilizes the flow separation and the resulting pressure drop caused by fluid flowing through a cylindrical measuring element to generate a differential pressure signal with the total pressure in the pipeline. This differential pressure is then converted into flow using a common calculation formula. Other existing technologies, such as Chinese utility model patent application number 2023202522176, entitled "A Insertion-Type Barometer Flowmeter," utilize the pressure difference generated by flow separation through a cylinder to measure flow. When the flow direction changes, the high and low pressure taps on the measuring element are swapped. While these existing technologies can detect gas flow, the differential pressure signal is not stable. The low-pressure tap is affected by the alternating flow separation, resulting in signal fluctuations that cannot be calmed down, making it impossible to guarantee measurement accuracy and repeatability.

[0004] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0005] The purpose of the utility model is to provide an insertable bidirectional flow measuring device, which can solve the technical problems of unstable flow signals and poor measurement accuracy of existing insertable bidirectional flow measuring devices.

[0006] In order to achieve the above-mentioned purpose, a specific embodiment of the present utility model provides an insertable bidirectional flow measuring device, including a columnar detection device body, a high-pressure pressure taking tube and a low-pressure pressure taking tube, the cross-section of the detection device body is elliptical, and the detection device body is provided with high-pressure holes parallel to the long axis of the elliptical cross-section on both sides with small curvature, and the detection device body is provided with low-pressure holes parallel to the short axis of the elliptical cross-section on both sides with large curvature, the high-pressure holes are connected to the high-pressure cavity inside the detection device body, and the low-pressure holes are connected to the low-pressure cavity inside the detection device body, the high-pressure cavity and the low-pressure cavity are both perpendicular to the elliptical cross-section, the high-pressure cavity is connected to the high-pressure pressure taking tube, and the low-pressure cavity is connected to the low-pressure pressure taking tube.

[0007] In one or more embodiments of the present invention, the detection device body is provided with low-pressure protection grooves on both sides with a large curvature, and the low-pressure hole is provided on the low-pressure protection grooves.

[0008] In one or more embodiments of the present invention, the depth of the low-pressure protection groove is half the length of the minor axis of the elliptical cross-section of the detection device body.

[0009] In one or more embodiments of the present invention, the high-pressure chambers are provided with at least two groups, and the low-pressure chambers are provided with at least one group. The high-pressure chambers are symmetrically arranged on the long axis with respect to the center of the elliptical cross-section, and the low-pressure chambers are arranged at the center point of the elliptical cross-section. The length of the long axis of the elliptical cross-section is twice the length of the short axis.

[0010] In one or more embodiments of the present invention, a high-pressure pipe connecting hole and a low-pressure pipe connecting port are provided on the end face of the detection device body, the high-pressure pipe connecting hole is connected to the high-pressure cavity, the high-pressure pressure taking pipe is installed in the high-pressure pipe connecting hole, the low-pressure pipe connecting port is connected to the low-pressure cavity, and the low-pressure pressure taking pipe is installed in the low-pressure pipe connecting port.

[0011] In one or more embodiments of the present invention, the insertable bidirectional flow measurement device further includes a differential pressure sensor, the high-pressure end of the differential pressure sensor is connected to the high-pressure pressure pipe, and the low-pressure end of the differential pressure sensor is connected to the low-pressure pressure pipe.

[0012] In one or more embodiments of the present invention, the major axis of the elliptical cross-section of the detection device body is parallel to the wind direction, and a stop valve is provided on the high-pressure pressure taking pipe. The stop valve on the high-pressure pressure taking pipe on the upstream side is opened, and the stop valve on the high-pressure pressure taking pipe on the downstream side is closed.

[0013] In one or more embodiments of the present invention, a spoiler angle is provided between the side wall of the low-pressure protection groove and the side surface with a large curvature of the detection device body.

[0014] In one or more embodiments of the present invention, at least two groups of high-pressure holes and low-pressure holes are provided, and each high-pressure hole and low-pressure hole is spaced apart along the height direction of the detection device body.

[0015] Compared with the prior art, the insertion-type bidirectional flow measurement device in the present invention has a detection device that is based on the principle of an average velocity tube, has a symmetrical cross-section, and has parabolic flow surfaces on both sides. The differential pressure generated when the fluid flows through the device is used to convert the flow rate in the pipeline. The high- and low-pressure chamber design with symmetrical cross-sections can measure flow in two directions. The high-pressure hole and the low-pressure hole are designed to be symmetrical on the left and right, so that the flow separation generated when the fluid flows through the measuring device is symmetrical on the left and right, and will not interfere with each other, thereby making the differential pressure signal more stable and the signal-to-noise ratio greater, thereby improving the accuracy and stability of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts.

[0017] Figure 1 This is a structural diagram of an insertion-type bidirectional flow measurement device in a specific embodiment of the present utility model;

[0018] Figure 2 This is a top view of the housing in a specific embodiment of the present utility model;

[0019] Figure 3 It is a structural schematic diagram of the spoiler angle in a specific embodiment of the present utility model.

[0020] Explanation of the main figure marks: 1. Detection device body, 2. High-pressure pressure taking tube, 3. Low-pressure pressure taking tube, 4. High-pressure hole, 5. High-pressure cavity, 6. Low-pressure cavity, 7. Low-pressure protection groove, 8. Low-pressure hole, 9. Turbine angle, 10. High-pressure tube mounting hole, 11. Low-pressure tube mounting hole. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "vertical", "horizontal", "top", "bottom", "up", "down", "front", "back", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] like Figures 1-2 As shown, an insertable bidirectional flow measuring device in a specific embodiment of the present invention is an insertable bidirectional flow measuring device, comprising a columnar detection device body 1, a high-pressure pressure taking tube 2 and a low-pressure pressure taking tube 3. The cross-section of the detection device body 1 is elliptical, and the detection device body 1 is provided with high-pressure holes 4 parallel to the major axis of the elliptical cross-section on both sides with a small curvature. The detection device body 1 is provided with low-pressure holes 8 parallel to the minor axis of the elliptical cross-section on both sides with a large curvature. The high-pressure hole 4 is connected to the high-pressure cavity 5 inside the detection device body 1, and the low-pressure hole 8 is connected to the low-pressure cavity 6 inside the detection device body 1. The high-pressure cavity 5 and the low-pressure cavity 6 are both perpendicular to the elliptical cross-section. The high-pressure cavity 5 is connected to the high-pressure pressure taking tube 2, and the low-pressure cavity 6 is connected to the low-pressure pressure taking tube 3.

[0024] In this embodiment, the detection device body 1 is provided with low-pressure protection grooves 7 on both sides with large curvature, and the low-pressure hole 8 is opened on the low-pressure protection groove 7. The depth of the low-pressure protection groove 7 is half the length of the minor axis of the elliptical cross-section of the detection device body 1.

[0025] In this embodiment, at least two groups of high-pressure chambers 5 are provided, and at least one group of low-pressure chambers 6 is provided. The high-pressure chambers 5 are symmetrically arranged about the major axis of the elliptical cross-section, and the low-pressure chambers 6 are located at the center point of the elliptical cross-section. The major axis of the elliptical cross-section is twice the length of the minor axis. At least two groups of high-pressure holes 4 and low-pressure holes 8 are provided, and each high-pressure hole 4 and low-pressure hole 8 are spaced apart along the height direction of the detection device body 1.

[0026] A high-pressure pipe connecting hole 10 and a low-pressure pipe connecting port 11 are provided on the end face of the detection device body 1. The high-pressure pipe connecting hole 10 is connected to the high-pressure chamber 5. The high-pressure pressure taking pipe 2 is installed in the high-pressure pipe connecting hole 10. The low-pressure pipe connecting port 11 is connected to the low-pressure chamber 6. The low-pressure pressure taking pipe 3 is installed in the low-pressure pipe connecting port 11.

[0027] The insertion-type bidirectional flow measurement device further includes a differential pressure sensor, the high-pressure end of the differential pressure sensor is connected to the high-pressure pressure pipe 2 , and the low-pressure end of the differential pressure sensor is connected to the low-pressure pressure pipe 3 .

[0028] The major axis of the elliptical cross-section of the detection device body 1 is parallel to the wind direction. A stop valve is provided on the high-pressure pressure taking pipe 2. The stop valve on the high-pressure pressure taking pipe 2 on the upstream side is open, and the stop valve on the high-pressure pressure taking pipe 2 on the downstream side is closed.

[0029] like Figure 3 As shown, a spoiler angle 9 is provided between the side wall of the low-pressure protection groove 7 and the side surface with a large curvature of the detection device body 1 .

[0030] It is well known to those skilled in the art that the differential pressure sensor and the stop valve are conventional devices in this field, so the structures for realizing the corresponding functions are not described in detail in this embodiment.

[0031] In this embodiment, when in use, the detection device is installed in the air flow according to the wind direction, and the pressure difference between the high-pressure hole 4 and the low-pressure hole 8 is calculated by the pressure difference sensor and the air flow rate is calculated, where the gas flow rate q v The pressure difference is satisfied:

[0032] where q v is the smoke gas flow rate, A is the expansion coefficient, α is the flow coefficient, ρ is the gas density, and Δp is the pressure difference.

[0033] The insertable bidirectional flow measurement device of the present invention has a detection device that is based on the principle of an averaging tube, has a symmetrical cross-section, and has parabolic flow-facing surfaces on both sides. The differential pressure generated when the fluid flows through the device is converted into the flow rate within the pipeline. The high- and low-pressure chambers are designed with symmetrical cross-sections, which can measure flow in both directions. The high-pressure port 4 and the low-pressure port 8 are designed to be bilaterally symmetrical, so that the flow separation generated when the fluid flows through the measuring device is bilaterally symmetrical and does not interfere with each other, thereby making the differential pressure signal more stable and the signal-to-noise ratio greater, thereby improving the accuracy and stability of the measurement.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An insertion-type bidirectional flow measurement device, characterized in that: The invention comprises a columnar detection device body (1), a high-pressure pressure-taking tube (2) and a low-pressure pressure-taking tube (3); the cross section of the detection device body (1) is elliptical; the detection device body (1) is provided with high-pressure holes (4) parallel to the major axis of the elliptical cross section on two sides with a smaller curvature; the detection device body (1) is provided with low-pressure holes (8) parallel to the minor axis of the elliptical cross section on two sides with a larger curvature; the high-pressure holes (4) are connected to a high-pressure cavity (5) inside the detection device body (1); the low-pressure holes (8) are connected to a low-pressure cavity (6) inside the detection device body (1); the high-pressure cavity (5) and the low-pressure cavity (6) are both perpendicular to the elliptical cross section; the high-pressure cavity (5) is connected to the high-pressure pressure-taking tube (2); and the low-pressure cavity (6) is connected to the low-pressure pressure-taking tube (3).

2. The insertion-type bidirectional flow measurement device according to claim 1, characterized in that: The detection device body (1) is provided with low-pressure protection grooves (7) on both sides with a large curvature, and the low-pressure hole (8) is provided on the low-pressure protection grooves (7).

3. The insertion-type bidirectional flow measurement device according to claim 2, characterized in that: The depth of the low-pressure protection groove (7) is half the length of the minor axis of the elliptical cross-section of the detection device body (1).

4. The insertion-type bidirectional flow measurement device according to claim 1, characterized in that: The high-pressure chambers (5) are provided with at least two groups, and the low-pressure chambers (6) are provided with at least one group. The high-pressure chambers (5) are symmetrically arranged on the long axis with respect to the center of the elliptical cross section, and the low-pressure chambers (6) are arranged at the center point of the elliptical cross section. The long axis length of the elliptical cross section is twice the short axis length.

5. The insertion-type bidirectional flow measurement device according to claim 4, characterized in that: A high-pressure pipe connection hole (10) and a low-pressure pipe connection port (11) are provided on the end surface of the detection device body (1); the high-pressure pipe connection hole (10) is connected to the high-pressure chamber (5); the high-pressure pressure-taking pipe (2) is installed in the high-pressure pipe connection hole (10); the low-pressure pipe connection port (11) is connected to the low-pressure chamber (6); and the low-pressure pressure-taking pipe (3) is installed at the low-pressure pipe connection port (11).

6. The insertion-type bidirectional flow measurement device according to claim 4, characterized in that: The insertable bidirectional flow measurement device further comprises a differential pressure sensor, wherein the high-pressure end of the differential pressure sensor is connected to the high-pressure pressure pipe (2), and the low-pressure end of the differential pressure sensor is connected to the low-pressure pressure pipe (3).

7. The insertion-type bidirectional flow measurement device according to claim 6, characterized in that: The major axis of the elliptical cross-section of the detection device body (1) is parallel to the wind direction, and a stop valve is provided on the high-pressure pressure taking pipe (2). The stop valve on the high-pressure pressure taking pipe (2) on the upstream side is open, and the stop valve on the high-pressure pressure taking pipe (2) on the downstream side is closed.

8. The insertion-type bidirectional flow measurement device according to claim 2, characterized in that: A turbulence angle (9) is provided between the side wall of the low-pressure protection groove (7) and the side surface with a large curvature of the detection device body (1).

9. The insertion-type bidirectional flow measurement device according to claim 1, characterized in that: The high-pressure holes (4) and the low-pressure holes (8) are each provided with at least two groups, and each high-pressure hole (4) and low-pressure hole (8) is arranged at intervals along the height direction of the detection device body (1).

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