Multi-point arrangement double-throat runoff meter

Abstract

The utility model discloses a multipoint arrangement double-throat runoff meter, which relates to the technical field of double-throat runoff meters, and comprises a base, the base is fixedly arranged on a pipeline, a positive pressure tapping pipe, a negative pressure tapping pipe and a supporting pipe are fixedly arranged on the base through flange plates, and the positive pressure tapping pipe, the negative pressure tapping pipe and the supporting pipe are all positioned in the pipeline; a plurality of double-throat diameters are fixedly installed on the supporting pipe, and the double-throat diameters are communicated with the positive pressure taking pipe and the negative pressure taking pipe. Through the arrangement of the double throat diameters, the positive pressure tapping pipe and the negative pressure tapping pipe, high-precision flow measurement under the conditions of a short straight pipe section and flow field turbulent flow is ensured, and the wind blocking area of the double throat diameters can be almost ignored, so that the pressure loss of the whole air duct fluid is almost avoided, the energy-saving effect is very obvious, the installation is convenient, and the cost is low. The flow meter is particularly suitable for flow measurement of large-pipe-diameter, short-straight-pipe-section and low-static-pressure fluid.

Description

Technical Field

[0001] The utility model relates to the technical field of double-throat flowmeters, in particular to a multi-point arranged double-throat flowmeter. Background Art

[0002] The double throat flowmeter is a differential pressure flowmeter. When the fluid flows in the pipeline, when it encounters a sudden shrinkage or expansion of the cross section, the flow rate will change, thus generating a pressure difference. By measuring this pressure difference, the flow rate of the fluid can be calculated.

[0003] In the existing technology, the double-throat flowmeter has poor flow measurement accuracy in short straight pipe sections and turbulent flow fields, and is not suitable for flow measurement in large pipe diameters, short straight pipe sections, and low static pressure fluids. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the utility model is to provide a multi-point arranged double-throat flowmeter, which ensures high-precision flow measurement in short straight pipe sections and turbulent flow fields by setting up double throats, positive pressure tubes and negative pressure tubes. The windshield area of ​​the double throats is almost negligible. Therefore, there is almost no pressure loss on the entire air duct fluid, the energy-saving effect is very significant, and the installation is easy. It is particularly suitable for use in flow measurement of large pipe diameters, short straight pipe sections, and low static pressure fluids.

[0005] One of the purposes of the utility model is achieved by the following technical solution: a multi-point arrangement double-throat flowmeter, including a base, the base is fixedly mounted on the pipeline, a positive pressure pipe, a negative pressure pipe and a support pipe are fixedly mounted on the base through a flange, the positive pressure pipe, the negative pressure pipe and the support pipe are all located inside the pipeline, a plurality of double throats are fixedly mounted on the support pipe, the double throats are connected with the positive pressure pipe and the negative pressure pipe, and pressure valves are installed on the upper ends of the positive pressure pipe and the negative pressure pipe. By setting up the double throats, positive pressure pipes and negative pressure pipes, high-precision flow measurement is guaranteed in the case of short straight pipe sections and turbulent flow fields, and the windshield area of ​​the double throats can be almost ignored. Therefore, there is almost no pressure loss on the entire air duct fluid, the energy-saving effect is very significant, and it is easy to install. It is particularly suitable for flow measurement of large pipe diameters, short straight pipe sections, and low static pressure fluids.

[0006] According to the multi-point arrangement double-throat flowmeter, the double-throat is made of stainless steel.

[0007] Beneficial Effects

[0008] Compared with the prior art, this utility model has the following beneficial effects:

[0009] 1. The double throat diameter is specially designed with stainless steel material, which has high pressure-taking efficiency, corrosion resistance, wear resistance and good anti-blocking effect;

[0010] 2. Use equal-section multi-point arrangement measuring probes to ensure high-precision flow measurement in short straight pipe sections and turbulent flow fields;

[0011] 3. Small fluid resistance and sharp edge wear, high measurement accuracy;

[0012] 4. Stable outflow coefficient and reliable performance;

[0013] 5. The straight pipe section required for installation is very short, 0 to 3D upstream and 0 to 1D downstream; there is no need to install a flow conditioner upstream; the straight pipe section is shortened by 70%, the straight pipe section <3D, and the rear straight pipe section <1D (D is the pipe diameter);

[0014] 6. Good pressure equalization effect and low pressure loss;

[0015] 7. It not only maintains the advantage of large differential pressure value of double throat diameter, but also has a specially designed structure that makes the pressure loss negligible. With the plug-in arrangement, the windshield area of ​​the double throat diameter part arranged at multiple points is almost negligible for the entire large air duct. Therefore, it has almost no pressure loss for the fluid in the entire air duct, and the energy-saving effect is very significant. It is easy to install and is particularly suitable for flow measurement of large pipe diameters, short straight pipe sections, and low static pressure fluids.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 This is a structural schematic diagram of a multi-point arrangement double-throat flowmeter of the utility model;

[0019] Figure 2 It is a schematic structural diagram of another direction of a multi-point arrangement double-throat flowmeter of the utility model.

[0020] Legend:

[0021] 1. Double throat diameter; 2. Pressure taking valve; 3. Base; 4. Positive pressure taking pipe; 5. Negative pressure taking pipe; 6. Support pipe; 7. Pipeline. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-2 The utility model embodiment is a multi-point arrangement double-throat flowmeter, which includes a base 3, the base 3 is fixedly installed on the pipeline 7, and a positive pressure pipe 4, a negative pressure pipe 5 and a support pipe 6 are fixedly installed on the base 3 through a flange. The positive pressure pipe 4, the negative pressure pipe 5 and the support pipe 6 are all located inside the pipeline 7, and a plurality of double throats 1 are fixedly installed on the support pipe 6. The plurality of double throats 1 are distributed in an equal-section multi-point arrangement, and an equal-section multi-point arrangement measuring probe is adopted to ensure high-precision flow measurement in short straight pipe sections and flow field turbulence conditions; the double throat 1 is made of stainless steel, the double throat 1 has high pressure-taking efficiency, and has good corrosion resistance, wear resistance and anti-blocking effects. The double throat 1 is connected to the positive pressure pipe 4 and the negative pressure pipe 5, and a pressure valve 2 is installed on the upper ends of the positive pressure pipe 4 and the negative pressure pipe 5. The overall fluid resistance and sharp edge wear are small, and the measurement accuracy is high; the outflow coefficient is stable and the performance is reliable; the straight pipe section required for installation is very short, 0 to 3D is required for the upstream, and 0 to 1D is required for the downstream; there is no need to install a flow regulator upstream; the straight pipe section is shortened by 70%, the straight pipe section <3D, and the rear straight pipe section <1D (D is the pipe diameter); the pressure equalization effect is good and the pressure loss is low; it not only maintains the advantage of the large differential pressure value of the double throat diameter, but also the specially designed structure makes the pressure loss negligible. With the insertion arrangement, for the entire large air duct, the windshield area of ​​the double throat diameter part arranged at multiple points is almost negligible. Therefore, it has almost no pressure loss on the entire air duct fluid, the energy-saving effect is very significant, and it is easy to install. It is particularly suitable for flow measurement of large pipe diameters, short straight pipe sections, and low static pressure fluids.

[0024] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-point arrangement double-throat flowmeter, comprising a base (3), characterized in that: The base (3) is fixedly mounted on the pipeline (7); a positive pressure-taking pipe (4), a negative pressure-taking pipe (5) and a support pipe (6) are fixedly mounted on the base (3) via a flange plate; the positive pressure-taking pipe (4), the negative pressure-taking pipe (5) and the support pipe (6) are all located inside the pipeline (7); a plurality of double throats (1) are fixedly mounted on the support pipe (6); the plurality of double throats (1) are distributed in a multi-point arrangement with equal cross-sections; the double throats (1) are connected to the positive pressure-taking pipe (4) and the negative pressure-taking pipe (5); and pressure valves (2) are mounted on the upper ends of the positive pressure-taking pipe (4) and the negative pressure-taking pipe (5).

2. A multi-point arrangement double throat flowmeter according to claim 1, characterized in that: The double throat (1) is made of stainless steel.

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