Uniform-speed tube flow sensor

Abstract

The utility model provides a uniform velocity pipe flow sensor, including pipeline, ball valve mounting seat and detection rod, the ball valve mounting seat is provided with mounting cavity on the outer wall of pipeline, the mounting cavity is communicated with the inner cavity of pipeline, the detection rod is inserted in the mounting cavity, the detection rod is inserted in the mounting cavity, the ball valve mounting seat is provided with the ball valve mounting seat, and the ball valve mounting seat is provided with the ball valve mounting seat. A positive pressure flow guide channel and a negative pressure flow guide channel are further arranged in the detection rod, a plurality of positive pressure tapping holes and a plurality of negative pressure tapping holes are further formed in the detection rod, all the positive pressure tapping holes are communicated with the positive pressure flow guide channel, all the negative pressure tapping holes are communicated with the negative pressure flow guide channel, all the positive pressure tapping holes face the incident flow surface, and all the negative pressure tapping holes face the incident flow surface. And the two external thread stop valves are respectively communicated with the positive pressure flow guide channel and the negative pressure flow guide channel. The flow sensor has the advantages that when the flow sensor of the uniform-speed pipe breaks down or needs to be overhauled, the pipeline can be temporarily closed, the detection rod can be pulled out, the ball valve installation base is closed, normal operation can be achieved, production stopping is not needed, meanwhile, the rhombus angle of the detection rod is optimized, and the flow measurement precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flowmeters, in particular to an average velocity tube flow sensor. Background Art

[0002] The measuring element of the average velocity tube flowmeter, the average velocity tube probe, is a new type of differential pressure flow measurement element developed based on the early pitot tube velocity measurement principle. The average velocity tube flow sensor combined with the differential pressure transmitter can measure the gas, liquid and steam flow of circular and rectangular pipes. Compared with other flow meters, it has a series of outstanding advantages such as long-term stability, simple installation and maintenance, small permanent pressure loss, low operating cost, significant energy saving, simple and reliable structure, etc., and has been widely used in measurement tests such as energy and environmental protection. Therefore, the average velocity tube flowmeter is widely used in industries such as electricity, metallurgy, petroleum, chemical industry, light industry, coal and urban public industries. However, there is only one negative pressure hole on the detection rod in the prior art. If the position, size or shape of the pressure hole of the detection rod does not meet the design requirements, or an error occurs during the installation process, the pressure hole may be blocked or the pressure signal cannot be collected normally. At the same time, when the average velocity tube flowmeter has a problem, the pipeline needs to be temporarily closed and production needs to be stopped, which affects the on-site production during the maintenance period. At the same time, the conventional diamond average velocity tube flowmeter has the problem of low accuracy and unstable measurement when measuring small flow. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an average velocity tube flow sensor for solving the technical problem in the prior art that when a problem occurs in the average velocity tube flow meter, the pipeline needs to be temporarily shut down and production needs to be stopped, which affects on-site production during the maintenance period.

[0004] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides an average velocity tube flow sensor, comprising:

[0005] pipeline;

[0006] A ball valve mounting seat, the ball valve mounting seat is arranged on the outer wall of the pipeline, the ball valve mounting seat is provided with a mounting cavity, and the mounting cavity is connected to the inner cavity of the pipeline;

[0007] A detection rod, the detection rod is inserted into the installation cavity, a positive pressure guide channel and a negative pressure guide channel are further provided in the detection rod, a plurality of positive pressure taking holes and a plurality of negative pressure taking holes are further provided on the detection rod, all the positive pressure taking holes are connected to the positive pressure guide channel, all the negative pressure taking holes are connected to the negative pressure guide channel, and all the positive pressure taking holes face the flow-fronting surface;

[0008] Two externally threaded stop valves are respectively connected to the positive-pressure flow guide channel and the negative-pressure flow guide channel.

[0009] The advantage of adopting the above technical solution is that when the average velocity tube flow sensor fails or needs to be repaired, the pipeline can be temporarily closed, the detection rod is pulled out, and the ball valve mounting seat is closed, and normal operation can be carried out without stopping production.

[0010] Optionally, a mounting seat flange is further provided on the ball valve mounting seat, the two externally threaded stop valves are arranged on the pressure-taking flange, and the mounting seat flange is connected to the pressure-taking flange.

[0011] Optionally, the cross-section of the detection rod is rhombus-shaped, and the positive pressure-taking hole is located on one of the rhombus corners.

[0012] Optionally, the angle of one diagonal of the cross section of the detection rod is 98°-104°, and the angle of the other diagonal is 76°-80°.

[0013] The advantage of adopting the above technical solution is that the measurement accuracy and stability can be improved by optimizing the rhombus angle.

[0014] Optionally, all of the positive pressure holes and the negative pressure holes are symmetrically arranged about the center line of the pipeline.

[0015] Optionally, a mounting base is further provided on the pipeline, the mounting base is a hollow structure, the inner cavity of the mounting base is connected to the inner cavity of the pipeline, and the insertion end of the detection rod extends into the inner cavity of the mounting base.

[0016] Optionally, a sealing member is further provided at the end of the detection rod close to the mounting base.

[0017] Optionally, a pressure-taking tube is further provided in the ball valve mounting seat, one end of the pressure-taking tube is connected to the positive-pressure guide channel or the negative-pressure guide channel, and the other end of the pressure-taking tube is connected to the corresponding externally threaded stop valve.

[0018] Optionally, a metal spiral wound gasket is further provided between the mounting seat flange and the pressure taking flange.

[0019] As described above, an averaging tube flow sensor of the utility model has the following beneficial effects: when the averaging tube flow sensor fails or needs maintenance, the pipeline can be temporarily closed, the detection rod can be pulled out, and the ball valve mounting seat can be closed, and normal operation can be carried out without stopping production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0021] Figure 2 Shown is a simulation result of a diamond cross section before optimization in one embodiment of the utility model;

[0022] Figure 3 The display is a velocity vector diagram of a diamond-shaped cross section before optimization in one embodiment of the utility model;

[0023] Figure 4 The display is a simulation result of an optimized diamond cross section in one embodiment of the utility model;

[0024] Figure 5 The display is a velocity vector diagram of a diamond-shaped cross section after optimization in one embodiment of the utility model;

[0025] Figure 6 Shown is the original rhombus cross-section angle prototype test verification in one embodiment of the utility model;

[0026] Figure 7 The display is a prototype test verification of the optimized rhombus cross-section angle in one embodiment of the utility model;

[0027] Figure 8 It is a schematic cross-sectional view of a detection rod in one embodiment of the utility model.

[0028] Part Number Description

[0029] 1 Pipeline

[0030] 2 Ball valve mounting seat

[0031] 201 Mounting flange

[0032] 3 Detection rod

[0033] 4 External thread stop valve

[0034] 401 Pressure flange

[0035] 5 Mounting base

[0036] 501 Seals

[0037] 6 Pressure pipe

[0038] 7 Metal spiral wound gasket DETAILED DESCRIPTION

[0039] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0040] See also Figures 1 to 7. It should be noted that the illustrations provided in this embodiment only illustrate the basic concept of the utility model in a schematic manner. The illustrations only show the components related to the utility model rather than being drawn according to the number, shape and size of the components during actual implementation. During implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complex. The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read. They are not used to limit the restrictive conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0041] See also Figures 1 to 7 As shown, the utility model provides an average velocity tube flow sensor, comprising:

[0042] Pipeline 1;

[0043] A ball valve mounting seat 2, wherein the ball valve mounting seat 2 is arranged on the outer wall of the pipeline 1, and a mounting cavity is provided on the ball valve mounting seat 2, and the mounting cavity is connected to the inner cavity of the pipeline 1;

[0044] A detection rod 3, the detection rod 3 is inserted into the installation cavity, a positive pressure guide channel and a negative pressure guide channel are further provided in the detection rod 3, a plurality of positive pressure taking holes and a plurality of negative pressure taking holes are further provided on the detection rod 3, all the positive pressure taking holes are connected to the positive pressure guide channel, all the negative pressure taking holes are connected to the negative pressure guide channel, and all the positive pressure taking holes face the flow-fronting surface;

[0045] Two externally threaded stop valves 4 are connected to the positive-pressure flow guide channel and the negative-pressure flow guide channel respectively.

[0046] During setting, a mounting hole and a through hole are set on the outer wall of the pipeline 1, and the ball valve mounting seat 2 is installed on the through hole. The ball valve mounting seat 2 is provided with an insertion hole, and the inner cavity of the insertion hole forms the mounting cavity. The insertion hole is connected with the through hole, and the inner cavity of the mounting base 5 is connected with the mounting hole, ensuring that the detection rod 3 is inserted into the pipeline 1, and its end can extend into the mounting base 5, thereby improving the stability of the detection rod 3 in the pipeline 1 and preventing the detection rod 3 from being offset due to impact.

[0047] After completing the installation of the detection rod 3, the two external threaded stop valves 4 are connected to the positive pressure guide channel and the negative pressure guide channel respectively to obtain positive pressure and negative pressure, and transmit them to the differential pressure transmitter through the pressure guide channel configured on site to obtain the flow of the measured medium.

[0048] Exemplarily, a mounting seat flange 201 is further provided on the ball valve mounting seat 2 , and the two externally threaded stop valves 4 are arranged on the pressure-taking flange 401 , and the mounting seat flange 201 is connected to the pressure-taking flange 401 .

[0049] It should also be noted that the mounting seat flange 201 and the pressure taking flange 401 are connected so that in case of maintenance or failure, the connection between the mounting seat flange 201 and the pressure taking flange 401 can be released, and the mounting seat flange 201 can be directly sealed to avoid leakage of the pipeline 1 without affecting the normal use of the pipeline 1.

[0050] Exemplarily, the cross section of the detection rod 3 is rhombus-shaped, and the positive pressure-taking hole is located on one of the rhombus corners.

[0051] It should also be noted that arranging the positive pressure-taking hole on the water chestnut corner of the drainage surface can reduce the impact of the measuring medium on the detection rod 3 and reduce the impact on the measurement accuracy.

[0052] Exemplarily, the angle of one diagonal of the cross section of the detection rod 3 is 98°-104°, and the angle of the other diagonal is 76°-80°.

[0053] In this solution, the cross section of the detection rod 3 has an angle of 102° at one diagonal and an angle of 78° at the other diagonal.

[0054] When the cross-sectional angle of the detection rod 3 is a 90° rhombus, it is the original rhombus cross-sectional angle;

[0055] When the cross section of the detection rod 3 is optimized to a rhombus with one diagonal angle of 102° and the other diagonal angle of 78°, the pressure-taking hole is located at the angle of 78°, which is the optimized rhombus angle;

[0056] Two DN100 averaging tube flow sensors are set up. Except for the cross-sectional angle, the other dimensions of the two averaging tube flow sensors are the same. The calibration method is the mass method. The range of differential pressure transmitter 1 is 25KPaEJA, and the range of differential pressure transmitter 2 is 1KPaEJA. The calibration flow is 68m^3 / h-1345m^3 / h, and the calibration points are 100%, 81%, 52%, 36%, 26%, 16%, 10%, 8%, 5%, a total of 9 points. The calibration medium is water.

[0057] From the liquid standard results, Figure 6As shown, the linearity of the original diamond cross-section angle is 0.95 when the range ratio is 6.7:1; the linearity is 1.05% when the range ratio is 8:1; the linearity is 1.45% when the range ratio is 10:1; the linearity is 1.71% when the range ratio is 12.5:1; and the linearity is 1.99% when the range ratio is 20:1.

[0058] From the liquid standard results, Figure 7 As shown, the linearity of the optimized diamond cross-section angle is 0.16% when the range ratio is 6.7:1; the linearity is 0.3% when the range ratio is 8:1; the linearity is 0.48% when the range ratio is 10:1; the linearity is 0.57% when the range ratio is 12.5:1; and the linearity is 0.92% when the range ratio is 20:1.

[0059] from Figure 6 and Figure 7 By comparison, it can be seen that the optimized diamond cross-section angle will improve the accuracy of the average velocity tube flow sensor, especially for small flow measurements, the effect is significantly improved.

[0060] Exemplarily, all the positive pressure holes and the negative pressure holes are symmetrically arranged about the center line of the pipeline 1 .

[0061] It should also be noted that if the position, size or shape of the pressure taking hole of the detection rod does not meet the design requirements, or an error occurs during the installation process, the pressure taking hole may be blocked or the pressure signal cannot be collected normally. The positive pressure taking hole and the negative pressure taking hole are symmetrically arranged relative to the center line of the pipeline 1. When the detection rod 3 is impacted by the medium to be measured, the detection rod 3 can be evenly stressed, avoiding inaccurate matching between the detection rod and the pressure taking hole due to vibration, humidity, corrosion and other factors in the installation environment, resulting in installation errors and eliminating installation errors.

[0062] Exemplarily, a mounting base 5 is further provided on the pipeline 1 . The mounting base 5 is a hollow structure. The inner cavity of the mounting base 5 is connected to the inner cavity of the pipeline 1 , and the insertion end of the detection rod 3 extends into the inner cavity of the mounting base 5 .

[0063] It should also be noted that the mounting base 5 is provided so that the end of the detection rod 3 extending into the pipe 1 can extend into the inner cavity of the mounting base 5 , and when the detection rod 3 is impacted by the medium to be measured, the end of the detection rod 3 can be on the mounting base 5 .

[0064] Exemplarily, a sealing member 501 is further provided at the end of the detection rod 3 close to the mounting base 5 .

[0065] It should also be noted that the purpose of providing the seal 501 is to block the lower ends of the positive pressure guide channel and the negative pressure guide channel to prevent the medium to be measured from entering from the lower ends of the positive pressure guide channel and the negative pressure guide channel.

[0066] Exemplarily, a pressure-taking tube 6 is further provided in the ball valve mounting seat 2 , one end of the pressure-taking tube 6 is connected to the positive-pressure guide channel or the negative-pressure guide channel, and the other end of the pressure-taking tube 6 is connected to the corresponding externally threaded stop valve 4 .

[0067] It should also be noted that a pressure-taking tube 6 is provided to connect the externally threaded stop valve 4 and the corresponding positive-pressure guide channel or negative-pressure guide channel. To save costs, a pressure-taking tube 6 can be provided to connect the positive-pressure guide channel or the negative-pressure guide channel, or two pressure-taking tubes 6 can be provided to respectively connect the positive-pressure guide channel and the negative-pressure guide channel to the two externally threaded stop valves 4.

[0068] Exemplarily, a metal spiral wound gasket 7 is further provided between the mounting seat flange 201 and the pressure taking flange 401 .

[0069] It should also be noted that the metal spiral wound gasket 7 is provided to enhance the sealing performance between the mounting seat flange 201 and the pressure taking flange 401 .

[0070] To sum up, by adopting an average-velocity tube flow sensor of the utility model, when the average-velocity tube flow sensor fails or needs maintenance, the pipeline can be temporarily closed, the detection rod is pulled out, and the ball valve mounting seat 2 is closed, and normal operation can be carried out without stopping production. At the same time, the positive pressure hole and the negative pressure hole are symmetrically arranged relative to the center line of the pipeline, which is beneficial to preventing blockage of the pressure holes and eliminating installation errors. At the same time, the cross-sectional angle of the detection rod is optimized to improve the measurement accuracy.

[0071] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. An average velocity tube flow sensor, characterized in that: include: Pipeline (1); A ball valve mounting seat (2), the ball valve mounting seat (2) being arranged on the outer wall of the pipeline (1), the ball valve mounting seat (2) being provided with a mounting cavity, the mounting cavity being connected to the inner cavity of the pipeline (1); A detection rod (3), the detection rod (3) is inserted into the installation cavity, a positive pressure guide channel and a negative pressure guide channel are further provided in the detection rod (3), a plurality of positive pressure taking holes and a plurality of negative pressure taking holes are further provided on the detection rod (3), all the positive pressure taking holes are connected to the positive pressure guide channel, all the negative pressure taking holes are connected to the negative pressure guide channel, and all the positive pressure taking holes face the flow-fronting surface; Two externally threaded stop valves (4), the two externally threaded stop valves being connected to the positive-pressure flow guiding channel and the negative-pressure flow guiding channel respectively.

2. The average velocity tube flow sensor according to claim 1, characterized in that: The ball valve mounting seat (2) is also provided with a mounting seat flange (201), the two externally threaded stop valves (4) are arranged on the pressure-taking flange (401), and the mounting seat flange (201) is connected to the pressure-taking flange (401).

3. The average velocity tube flow sensor according to claim 2, characterized in that: The cross section of the detection rod (3) is rhombus-shaped, and the positive pressure-taking hole is located on one of the rhombus corners.

4. The average velocity tube flow sensor according to claim 3, characterized in that: The angle of one diagonal of the cross section of the detection rod (3) is 98°-104°, and the angle of the other diagonal is 76°-80°.

5. The average velocity tube flow sensor according to claim 3, characterized in that: All the positive pressure holes and the negative pressure holes are arranged symmetrically about the center line of the pipeline (1).

6. The average velocity tube flow sensor according to claim 4, characterized in that: The pipeline (1) is also provided with a mounting base (5), the mounting base (5) is a hollow structure, the inner cavity of the mounting base (5) is connected to the inner cavity of the pipeline (1), and the insertion end of the detection rod (3) extends into the inner cavity of the mounting base (5).

7. The average velocity tube flow sensor according to claim 6, characterized in that: A sealing member (501) is also provided at the end of the detection rod (3) close to the mounting base (5).

8. The average velocity tube flow sensor according to claim 7, characterized in that: A pressure-taking tube (6) is also provided in the ball valve mounting seat (2), one end of the pressure-taking tube (6) is connected to the positive-pressure flow guide channel or the negative-pressure flow guide channel, and the other end of the pressure-taking tube (6) is connected to the corresponding externally threaded stop valve (4).

9. The average velocity tube flow sensor according to claim 8, characterized in that: A metal spiral wound gasket (7) is also provided between the mounting seat flange (201) and the pressure taking flange (401).

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