Pipeline flow velocity measuring device

Abstract

A pipeline flow velocity measuring device relates to the technical field of gas flow velocity measuring devices and comprises a tubular pressure measuring channel and a hub, one end of the pressure measuring channel is provided with a first flange used for being connected with a gas flow incoming pipeline flange, and the other end of the pressure measuring channel is provided with a second flange used for being connected with a gas flow outflow end pipeline flange; the hub is arranged at the central position in the pressure measuring channel, a plurality of pressure measuring pipes are radially arranged on the hub in the same plane in the circumferential direction, one end of each pressure measuring pipe is fixedly connected to the hub, the other end of each pressure measuring pipe penetrates and extends out of the pressure measuring channel, and a measuring hole is formed in the pipe wall of the windward side of each pressure measuring pipe; one end of the pressure measuring nozzle penetrates through the pressure measuring channel and is flush with the inner wall surface of the pressure measuring channel, and the other end of the pressure measuring nozzle extends out of the pressure measuring channel; one ends, extending out of the pressure measuring channel, of the pressure measuring pipe and the pressure measuring nozzle are connected with a pressure measuring device through air pipes. The static pressure and the dynamic pressure in the pipeline can be measured on line, the use is fast and convenient, multiple positions are measured, and the accuracy of measured data is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas flow velocity measuring devices, in particular to a pipeline flow velocity measuring device. Background Technique

[0002] In order to detect the performance parameters of a fan during use and verify whether its performance meets the customer's requirements, it is necessary to accurately measure parameters such as the gas flow rate, pressure, and flow velocity at the inlet and outlet of the fan. Traditionally, a Pitot tube is commonly used for on-site testing of the pressure and flow rate of a fan. The Pitot tube measures the pressure difference between the static pressure and the dynamic pressure in the fan pipeline, thereby calculating the flow velocity of the fluid and further obtaining the gas flow rate. When using a Pitot tube for on-site measurement, it is necessary to first punch holes in the pipeline. The detection personnel need to hold the Pitot tube and continuously adjust its insertion depth in the pipeline to obtain data, resulting in relatively poor detection stability, large data reading errors, and high requirements for the on-site experience of the detection personnel. In addition, the customer's on-site production line needs to be shut down for punching, which will affect the normal production of the customer. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is: to provide a pipeline flow velocity measuring device that can accurately measure values, perform on-line measurement without shutting down for punching, and reduce the excessive dependence on the on-site experience of the testing personnel.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is: a pipeline flow velocity measuring device, including a circular tube-shaped pressure measuring channel and a hub. One end of the pressure measuring channel is provided with a first flange for connecting the pipeline flange of the air flow incoming direction, and the other end is provided with a second flange for connecting the pipeline flange of the air flow outlet end; the hub is arranged at the central position in the pressure measuring channel. A plurality of pressure measuring tubes are radially arranged along the circumferential direction of the hub in the same plane. One end of the pressure measuring tube is fixedly connected to the hub, and the other end penetrates and extends out of the pressure measuring channel. Measuring holes for flow velocity measurement are arranged on the windward side wall of the pressure measuring tube; a pressure measuring nozzle is arranged on the pressure measuring channel. One end of the pressure measuring nozzle penetrates the pressure measuring channel and is flush with the inner wall surface of the pressure measuring channel, and the other end extends out of the pressure measuring channel; one end of the pressure measuring tube and the pressure measuring nozzle extending out of the pressure measuring channel are respectively connected to a pressure measuring device through an air pipe. The measuring holes on the pressure measuring tube are used to measure the dynamic pressure of the incoming air flow, and the pressure measuring nozzle is used to measure the cross-sectional static pressure.

[0005] Preferably, the pressure measuring tube is a thin-walled circular tube and is uniformly distributed in the circumferential direction of the pressure measuring channel.

[0006] Preferably, a plurality of measuring holes are arranged and regularly distributed on the windward side of the pressure measuring tube.

[0007] Preferably, the pressure measuring nozzle is a hollow circular tube and a plurality of them are provided. The pressure measuring nozzles are in the same plane and are uniformly distributed in the circumferential direction of the pressure measuring channel.

[0008] Preferably, the pressure measuring device is a pressure gauge.

[0009] Preferably, the windward end of the hub is a cone, and the tip of the cone is an arc cone top structure.

[0010] Preferably, the opening shape and size of the pressure measuring channel are adapted to the opening shape and size of the fan duct.

[0011] According to the above technical solution, the beneficial effects of the present utility model are as follows:

[0012] 1. A pipeline flow velocity measuring device provided by the present utility model can be installed on the inlet and outlet pipelines of a fan to measure the static pressure and dynamic pressure in the fan pipeline online, so as to further calculate the flow velocity and flow rate of the air flow. The entire production line does not need to stop for drilling, and it is quick and convenient to use.

[0013] 2. By designing the windward end of the hub as an arc cone top structure, the present utility model can guide the air flow through the pressure measuring section with small resistance, and at the same time establish a uniform velocity field and pressure field at this section, thereby ensuring the accuracy of the pipeline test results.

[0014] 3. The present utility model provides a pipeline flow velocity measuring device. The device has a simple structure, and the pressure measuring tubes and pressure measuring nozzles are evenly distributed. It can detect at multiple positions in the circumferential direction of the pipeline to measure the flow velocity and pressure distribution at different positions. It not only ensures the accuracy of the measurement data, but also facilitates the study of the gas flow field distribution in the pipeline, and at the same time reduces the dependence on the on-site experience of the test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the pressure measuring tube.

[0017] Reference numerals in the figures: 1, pressure measuring channel; 2, first flange; 3, second flange; 4, pressure measuring tube; 5, pressure measuring nozzle; 6, hub. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0019] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions under which the present utility model can be implemented. Therefore, they do not have any technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size should still fall within the scope that can be covered by the technical content disclosed in the present utility model without affecting the effects that the present utility model can produce and the purposes that can be achieved.

[0020] As shown Figure 1 in the figure, a pipeline flow velocity measuring device includes a pressure measuring channel 1, a first flange 2, a second flange 3, a pressure measuring tube 4, a pressure measuring nozzle 5 and a hub 6. a is the pipeline fixed end, and b is the hub connection end.

[0021] One end of the pressure measuring channel 1 is provided with a first flange 2 for connecting the pipeline flange in the air flow direction, and the other end is provided with a second flange 3 for connecting the pipeline flange at the air flow outlet end; the first flange 2 is the air flow inlet end, and the first flange 2 is connected to the pipeline flange in the air flow direction, and the second flange 3 is the air flow outlet end, and the second flange 3 is connected to the pipeline flange where the air flow is about to flow in; the air flow flows in from the first flange 2 end, passes through the pressure measuring pipeline 1, flows out from the second flange 3 end, and then flows into the pipeline connected to the second flange 3.

[0022] The pressure measuring channel 1 is in a circular tube shape, the pressure measuring channel 1 is a hollow structure inside, the inner wall of the pressure measuring channel 1 is smooth, without burrs, protrusions, etc., and the opening shape and size of the pressure measuring channel 1 are adapted to the opening shape and size of the fan pipeline.

[0023] The hub 6 is arranged at the central position inside the pressure measuring channel 1. The windward end of the hub 6 is in a conical shape, and the tip part of the cone is an arc cone top structure. The arc cone top structure of the hub 6 can guide the air flow through the pressure measuring section with small resistance, and at the same time establish a uniform velocity field and pressure field at this section, so as to ensure the accuracy of the pipeline test results.

[0024] A plurality of pressure measuring tubes 4 are radially arranged on the hub 6 in the same plane along the circumferential direction. One end of the pressure measuring tube 4 is fixedly connected to the hub 6, and the other end extends through the pressure measuring channel 1. Measuring holes for flow velocity measurement are provided on the windward side wall of the pressure measuring tube 4.

[0025] The pressure measuring tube 4 is a thin-walled circular tube. A plurality of pressure measuring tubes 4 can be provided. The plurality of pressure measuring tubes 4 are in the same plane and are evenly distributed around the circumferential direction of the pressure measuring channel 1. The pressure measuring tubes 4 are connected in pairs to form a straight line; in this embodiment, a total of six pressure measuring tubes 4 are provided, and the six pressure measuring tubes 4 are in the same plane and are evenly distributed around the circumferential direction of the pressure measuring channel 1.

[0026] The measuring holes on the pressure measuring tube 4 are the air flow velocity measurement points on the windward side of the pressure measuring tube 4. A plurality of measuring holes can be provided on the pressure measuring tube 4. The distribution positions of the plurality of measuring holes are determined by the linear method specified in the national standard GB / T10178-2006 from the pipeline fixed end a to the hub connection end b; in this embodiment, four measuring holes are provided on each pressure measuring tube 4, and the distribution positions of the four measuring holes are set from the pipeline fixed end a to the hub connection end b according to the provisions of the national standard GB / T10178-2006, as Figure 2 shown

[0027] A pressure measuring nozzle 5 is provided on the pressure measuring channel 1. One end of the pressure measuring nozzle 5 penetrates the pressure measuring channel 1 and is flush with the inner wall surface of the pressure measuring channel 1, and the other end extends out of the pressure measuring channel 1. The pressure measuring nozzle 5 is a hollow circular tube and there are several of them. The several pressure measuring nozzles 5 are in the same plane and are evenly distributed around the circumferential direction of the pressure measuring channel 1. In this embodiment, there are four pressure measuring nozzles 5, and the four pressure measuring nozzles 5 are in the same plane and are evenly distributed around the circumferential direction of the pressure measuring channel 1.

[0028] The pressure measuring tube 4 and one end of the pressure measuring nozzle 5 extending out of the pressure measuring channel 1 are respectively connected to a pressure measuring device through an air pipe. The measuring holes on the pressure measuring tube are used to measure the dynamic pressure of the incoming air flow, and the pressure measuring nozzle is used to measure the static pressure of the cross-section.

[0029] In this embodiment, one end of the pressure measuring tube 4 and the pressure measuring nozzle 5 extending out of the pressure measuring channel 1 are respectively directly connected to the pressure gauge of the test system through an air pipe. The numerical value can be directly read on the visual panel of the system, or the on-site personnel can directly connect to a handheld flow meter for measurement. The measuring holes on the pressure measuring tube 4 are used to measure the dynamic pressure of the incoming air flow. The dynamic pressures measured by the six pressure measuring tubes are averaged to obtain the dynamic pressure value at this plane. According to P = ρv 2 / 2, the air flow velocity is calculated, and then according to Q = Av, the air flow rate of the fan is calculated; the pressure measuring nozzle 5 is used to measure the static pressure of the cross-section. The static pressures measured by the four pressure measuring nozzles are averaged to obtain the static pressure value at this plane.

[0030] When in use, when it is necessary to measure the air flow pressure difference at the inlet of the fan, the present utility model is connected to the pipeline at the air inlet of the fan to measure the inlet air flow pressure difference. The first flange 2 is flange-connected to the pipeline flange in the air flow incoming direction, and the second flange 3 is flange-connected to the pipeline flange where the air flow is about to flow in; when it is necessary to measure the air flow pressure difference at the air flow outlet, the present utility model is connected to the pipeline at the outlet end of the fan volute to measure the air flow pressure difference at the outlet. The first flange 2 is flange-connected to the pipeline flange in the air flow incoming direction, and the second flange 3 is flange-connected to the pipeline flange where the air flow is about to flow in.

[0031] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model all fall within the protection scope of the present utility model.

Claims

1. A pipeline flow velocity measuring device, characterized in that: It includes a circular tubular pressure measuring channel (1) and a hub (6). One end of the pressure measuring channel (1) is provided with a first flange (2) for connecting to the pipeline flange of the air flow incoming direction, and the other end is provided with a second flange (3) for connecting to the pipeline flange of the air flow outlet end. The hub (6) is arranged at the central position inside the pressure measuring channel (1). A plurality of pressure measuring tubes (4) are radially arranged in the circumferential direction on the hub (6) in the same plane. One end of the pressure measuring tube (4) is fixedly connected to the hub (6), and the other end penetrates and extends out of the pressure measuring channel (1). Measuring holes for flow velocity measurement are provided on the windward side wall of the pressure measuring tube (4). A pressure measuring nozzle (5) is provided on the pressure measuring channel (1). One end of the pressure measuring nozzle (5) penetrates the pressure measuring channel (1) and is flush with the inner wall surface of the pressure measuring channel (1), and the other end extends out of the pressure measuring channel (1). One ends of the pressure measuring tube (4) and the pressure measuring nozzle (5) extending out of the pressure measuring channel (1) are respectively connected to a pressure measuring device through air pipes. The measuring holes on the pressure measuring tube (4) are used to measure the dynamic pressure of the incoming air flow, and the pressure measuring nozzle (5) is used to measure the static pressure of the cross-section.

2. The pipeline flow velocity measuring device according to claim 1, wherein: The pressure measuring tube (4) is a thin-walled circular tube and is evenly distributed in the circumferential direction of the pressure measuring channel (1).

3. A pipeline flow velocity measuring device according to claim 1, characterized in that: A number of the measuring holes are provided and are regularly distributed on the windward side of the pressure measuring tube (4).

4. A pipeline flow velocity measuring device according to claim 1, characterized in that: The pressure measuring nozzle (5) is a hollow circular tube and a number of them are provided. The pressure measuring nozzles (5) are in the same plane and are evenly distributed in the circumferential direction of the pressure measuring channel (1).

5. A pipeline flow velocity measuring device according to claim 1, characterized in that: The pressure measuring device is a pressure gauge.

6. The pipeline flow velocity measuring device according to claim 1, characterized in that: The windward end of the hub (6) is a cone, and the tip part of the cone is an arc cone top structure.

7. The pipeline flow velocity measuring device according to claim 1, characterized in that: The opening shape and size of the pressure measuring channel (1) are adapted to the opening shape and size of the fan pipeline.

Images