A venturi tube with adjustable throat diameter

Abstract

The present invention relates to the technical field of venturi tubes, and in particular to a venturi tube with adjustable throat diameter. The venturi tube with adjustable throat diameter comprises an outer tube, a throat tube, a matching tube, a pressing tube and a tightening mechanism. The outer tube is divided into a straight tube section and a diffusion section. A limit platform is formed at the junction of the straight tube section and the diffusion section. The throat tube is inserted into the straight tube section on the outer tube and is slidably connected to the inner side wall of the straight tube section; the matching tube is inserted into the straight tube section on the outer tube and is slidably connected to the inner side wall of the straight tube section. The pressing tube used to tightly connect the outer tube, the throat tube and the matching tube is sleeved on the outer tube and located on the opening of the straight tube section. The pressing tube comprises an L-shaped section and a straight section. The L-shaped section is sleeved on the straight tube section and is slidably connected to the outer side wall of the straight tube section. The tightening mechanism used to assist the pressing tube is installed on the outer tube. The venturi tube with adjustable throat diameter provided by the present invention is easy to maintain and overhaul, and has the advantages of simple structure and simple assembly.

Description

Technical Field

[0001] The invention relates to the technical field of venturi tubes, and in particular to a venturi tube with adjustable throat diameter. Background Art

[0002] The venturi throat can be used as an instrument to measure flow rate; it can also be used as a highly efficient gas cooling, purification or absorption device. The venturi throat is divided into built-in venturi throat and inserted venturi throat according to its structure. It has achieved good results in the measurement of combustion air, cold air, gas (blast furnace gas, coke oven gas, converter gas) of hot blast furnaces in steel plants and large-diameter and low-velocity pipe meters for primary and secondary air of boilers in thermal power plants. It solves the problem of accurate measurement of various types of gas flow at low pressure, large diameter and low velocity in current industrial enterprises. The unique structural design and data processing method have a strict basis in fluid mechanics, and are calibrated in real flow in a large national key laboratory.

[0003] When the Venturi tube is used for measurement, it is necessary to adjust the throat size of the Venturi tube in the tube body at any time according to the need to measure the flow rate and pressure in the tube body in the actual use scenario. Therefore, a single conventional flow meter cannot meet the requirements of full-scale measurement. Usually, multiple flow measurement devices are connected in parallel, and full-scale measurement is performed to measure the flow of different processes by valve switching or combination. This method requires switching different valve combinations for different flow states. On the one hand, the measurement process is more cumbersome, the control program is complex, and more actuators are required to complete the switching of the measuring device; on the other hand, the measurement cost is increased several times; finally, multiple measuring devices require a larger installation space, which puts higher requirements on the applicable environment, and correspondingly greatly increases the installation, maintenance and overhaul costs. Although some existing Venturi tubes with variable throat diameters have reduced costs and reduced installation space, their structures are complex and difficult to maintain and overhaul. Once damaged, they can only be discarded, resulting in waste.

[0004] Therefore, it is necessary to provide a new venturi tube with adjustable throat diameter to solve the above-mentioned technical problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a venturi tube with adjustable throat diameter which has a simple structure, is easy to maintain and overhaul, and is easy to assemble.

[0006] The venturi tube with adjustable throat diameter provided by the present invention comprises: an outer tube, a throat tube, a matching tube, a pressing tube and a tightening mechanism, wherein the outer tube is divided into a straight tube section and a diffusion section, the throat tube is inserted into the straight tube section on the outer tube and is slidably connected to the inner side wall of the straight tube section; the matching tube is inserted into the straight tube section on the outer tube and is slidably connected to the inner side wall of the straight tube section, the pressing tube used for tightly connecting the outer tube, the throat tube and the matching tube is sleeved on the outer tube and is located on the opening of the straight tube section, and the tightening mechanism The structure is used to lock the compression tube onto the outer tube. During assembly, first align the wider end of the throat with the straight tube section on the outer tube and insert it in. Then align the matching tube with the straight tube section on the outer tube and insert it in. Then, put the compression tube onto the straight tube section and rotate the compression tube to connect it with the tightening mechanism. The tightening mechanism is used to pull the compression tube toward the straight tube section so that the outer tube, throat, matching tube and compression tube are tightly connected together to avoid liquid or gas leakage. The assembly is simple and the formed Venturi tube has a simple structure and is easy to maintain and overhaul.

[0007] Preferably, a limit platform is formed at the junction of the straight pipe section and the diffuser section, and the limit platform limits the throat pipe in the straight pipe section.

[0008] Preferably, the pressure pipe includes an L-shaped section and a straight section, the L-shaped section is sleeved on the straight pipe section and slidably connected to the outer side wall of the straight pipe section, the L-shaped section is used to connect to the outer pipe without changing the pipe diameter, and the straight section is used to connect to the pipeline that needs to be measured.

[0009] Preferably, two symmetrically arranged connecting strips are provided on the L-shaped segment, and the connecting strips and the L-shaped segment are integrally formed, and the connecting strips are used to connect the L-shaped segment and the tightening mechanism together.

[0010] Preferably, the tightening mechanism includes a mounting plate, a threaded rod, a knob, a pull plate and a sliding rod. The mounting plate is fixedly mounted on the outer side wall of the outer tube, and a threaded rod with a threaded connection passes through the mounting plate. A knob is fixedly mounted on one end of the threaded rod, and a pull plate with a rotational connection is mounted on the other end of the threaded rod. A sliding rod is fixedly mounted on the pull plate, and the sliding rod passes through the mounting plate and is slidingly connected to the mounting plate. The connecting strip is screwed into the pull plate, and the knob is turned to drive the threaded rod to rotate, so that the threaded rod moves with the pull plate toward the mounting plate, and the connecting strip is tightened, so that the L-shaped section is tightly connected to the straight pipe section, and the outer tube, throat pipe and matching pipe are pressed tightly together to avoid liquid leakage and air leakage.

[0011] Preferably, two symmetrically arranged positioning grooves are provided on the inner side wall of the straight pipe section, and two measuring tubes are fixedly mounted on the straight pipe section, and the positioning grooves are used to fix the positions of the throat pipe and the matching pipe to prevent them from rotating and blocking the measuring tubes.

[0012] Preferably, the straight pipe section is provided with two symmetrically arranged through grooves, the through grooves being located in the positioning grooves, and the through grooves are used for inserting a tool to pry the throat out of the outer tube when replacing the throat tube.

[0013] Preferably, two symmetrically arranged limit strips are fixedly installed on the outer side walls of the throat pipe and the matching tube, and through holes are opened on the throat pipe and the matching tube. The limit strips are inserted in the positioning grooves and fix the positions of the throat pipe and the matching tube together with the positioning grooves to prevent them from rotating or being misplaced during installation, causing the through holes to be misplaced and resulting in the measuring tube being disconnected from the inside of the throat pipe and the matching tube.

[0014] Preferably, a groove is provided on the limiting strip on the throat, and the groove provides a prying point for a tool for prying the throat.

[0015] Preferably, a fixing plate is fixedly mounted on the outer side wall of the outer tube for mounting the outer tube on a measuring instrument.

[0016] Compared with the related art, the venturi tube with adjustable throat diameter provided by the present invention has the following beneficial effects:

[0017] 1. The present invention provides a venturi tube with adjustable throat diameter. When assembling, first align the wider end of the throat tube with the straight tube section on the outer tube and insert it, and align the limit bar with the positioning groove and the through hole with the measuring tube, then align the matching tube with the straight tube section on the outer tube and insert it, and align the limit bar with the positioning groove and the through hole with the measuring tube, and put the L-shaped section on the pressing tube onto the straight tube section, rotate the pressing tube, screw the connecting bar into the pull plate, rotate the knob, drive the threaded rod to rotate, so that the threaded rod moves with the pull plate toward the mounting plate, tighten the connecting bar, so that the L-shaped section is tightly connected with the straight tube section, and the outer tube, the throat tube and the matching tube are tightly connected together to avoid liquid leakage and gas leakage. The assembly is simple, and the formed venturi tube has a simple structure and is easy to maintain and overhaul.

[0018] 2. The present invention can change the throat diameter of the venturi tube only by replacing the throat tube with a different throat diameter, which is simple to operate and easy to maintain and overhaul. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a preferred embodiment of a venturi tube with adjustable throat diameter provided by the present invention;

[0020] Figure 2 for Figure 1 A schematic cross-sectional view of the outer tube shown;

[0021] Figure 3 for Figure 1 A schematic diagram of the side view of the outer tube shown;

[0022] Figure 4 for Figure 1 An assembly diagram of the structure shown;

[0023] Figure 5 for Figure 4Schematic diagram of the cross-sectional structure of the throat shown.

[0024] Numbers in the figure: 1, outer tube; 11, straight pipe section; 12, diffusion section; 2, throat; 3, matching tube; 4, pressure tube; 41, L-shaped section; 42, straight section; 5, connecting strip; 6, tightening mechanism; 61, mounting plate; 62, threaded rod; 63, knob; 64, pull plate; 65, slide rod; 7, positioning groove; 8, through groove; 9, limit platform; 9a, measuring tube; 9b, limit strip; 9c, groove; 9d, through hole; 9e, fixing plate. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a venturi tube with adjustable throat diameter provided by the present invention; Figure 2 for Figure 1 A schematic cross-sectional view of the outer tube shown; Figure 3 for Figure 1 A schematic diagram of the side view of the outer tube shown; Figure 4 for Figure 1 An assembly diagram of the structure shown; Figure 5 for Figure 4 The cross-sectional structure diagram of the throat pipe shown includes: an outer tube 1, a throat pipe 2, a matching tube 3, a pressing tube 4 and a tightening mechanism 6.

[0027] In the specific implementation process, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the outer tube 1 is divided into a straight tube section 11 and a diffusion section 12, the throat tube 2 is inserted in the straight tube section 11 on the outer tube 1 and is slidably connected to the inner wall of the straight tube section 11; the matching tube 3 is inserted in the straight tube section 11 on the outer tube 1 and is slidably connected to the inner wall of the straight tube section 11, the pressing tube 4 used to tightly connect the outer tube 1, the throat tube 2 and the matching tube 3 together is sleeved on the outer tube 1 and is located on the opening of the straight tube section 11, and the tightening mechanism 6 is used to lock the pressing tube 4 on the outer tube 1.

[0028] It should be noted that: during assembly, first align the wider end of the throat pipe 2 with the straight pipe section 11 on the outer tube 1 and insert it, then align the matching tube 3 with the straight pipe section 11 on the outer tube 1 and insert it, then put the pressing tube 4 on the straight pipe section 11, rotate the pressing tube 4 to connect it with the tightening mechanism 6, and use the tightening mechanism 6 to pull the pressing tube 4 toward the straight pipe section 11, so that the outer tube 1, the throat pipe 2, the matching tube 3 and the pressing tube 4 are tightly connected together to avoid leakage of liquid and gas. The assembly is simple, and the formed Venturi tube has a simple structure and is easy to maintain and overhaul.

[0029] It should be noted that the outer diameters of the throat pipes 2 with different throat diameters for replacement are the same, but the throat diameters are different.

[0030] refer to Figure 2 As shown, a limiting platform 9 is formed at the junction of the straight pipe section 11 and the diffuser section 12 , and the limiting platform 9 limits the throat pipe 2 in the straight pipe section 11 .

[0031] refer to Figure 1 As shown, the pressing pipe 4 includes an L-shaped section 41 and a straight section 42 . The L-shaped section 41 is sleeved on the straight pipe section 11 and is slidably connected to the outer side wall of the straight pipe section 11 .

[0032] It should be noted that the L-shaped section 41 is used to connect with the outer pipe 1 without changing the pipe diameter, and the straight section 42 is used to connect with the pipe to be measured.

[0033] refer to Figure 1 As shown, the tightening mechanism 6 includes a mounting plate 61, a threaded rod 62, a knob 63, a pull plate 64 and a slide rod 65. The mounting plate 61 is fixedly mounted on the outer side wall of the outer tube 1, and a threaded rod 62 with a thread connection passes through the mounting plate 61. A knob 63 is fixedly mounted on one end of the threaded rod 62, and a pull plate 64 with a rotation connection is mounted on the other end of the threaded rod 62. A slide rod 65 is fixedly mounted on the pull plate 64, and the slide rod 65 passes through the mounting plate 61 and is slidably connected to the mounting plate 61. Two symmetrically arranged connecting strips 5 are arranged on the L-shaped segment 41, and the connecting strip 5 is integrally formed with the L-shaped segment 41.

[0034] It should be noted that: screw the connecting strip 5 into the pull plate 64, turn the knob 63, drive the threaded rod 62 to rotate, so that the threaded rod 62 moves with the pull plate 64 toward the mounting plate 61, tighten the connecting strip 5, so that the L-shaped section 41 is tightly connected with the straight pipe section 11, and the outer tube 1, the throat tube 2 and the matching tube 3 are pressed tightly together to avoid leakage of liquid or gas.

[0035] refer to Figure 2As shown, two symmetrically arranged positioning grooves 7 are opened on the inner side wall of the straight pipe section 11, and two measuring tubes 9a are fixedly installed on the straight pipe section 11. The positioning grooves 7 are used to fix the positions of the throat pipe 2 and the matching pipe 3 to prevent them from rotating or being misplaced during installation and blocking the measuring tubes 9a.

[0036] refer to Figure 2 As shown, the straight pipe section 11 is provided with two symmetrically arranged through grooves 8 , and the through grooves 8 are located in the positioning grooves 7 . The through grooves 8 are used for inserting a tool to pry the throat 2 out of the outer tube 1 when replacing the throat 2 .

[0037] refer to Figure 4 and Figure 5 As shown, two symmetrically arranged limit strips 9b are fixedly installed on the outer side walls of the throat pipe 2 and the matching pipe 3, and through holes 9d are opened on the throat pipe 2 and the matching pipe 3. The limit strips 9b are inserted in the positioning grooves 7, and together with the positioning grooves 7, fix the positions of the throat pipe 2 and the matching pipe 3 to prevent them from rotating or being misplaced during installation, so that the through holes 9d are misplaced, resulting in the measurement tube 9a being disconnected from the inside of the throat pipe 2 and the matching pipe 3.

[0038] refer to Figure 5 As shown, the limiting strip 9 b on the throat 2 is provided with a groove 9 c , and the groove 9 c provides a prying point for a tool for prying the throat 2 .

[0039] refer to Figure 1 As shown, a fixing plate 9e is fixedly mounted on the outer side wall of the outer tube 1 for mounting the outer tube 1 on a measuring instrument.

[0040] The working principle of the venturi tube with adjustable throat diameter provided by the present invention is as follows:

[0041] During assembly, first align the wider end of the throat 2 with the straight pipe section 11 on the outer tube 1 and insert it, and align the limit strip 9b with the positioning groove 7 and the through hole 9d with the measuring tube 9a. Then align the matching tube 3 with the straight pipe section 11 on the outer tube 1 and insert it, and align the limit strip 9b with the positioning groove 7 and the through hole 9d with the measuring tube 9a. Put the L-shaped section 41 on the pressing tube 4 onto the straight pipe section 11, rotate the pressing tube 4, screw the connecting strip 5 into the pull plate 64, rotate the knob 63, drive the threaded rod 62 to rotate, so that the threaded rod 62 moves with the pull plate 64 toward the mounting plate 61, tighten the connecting strip 5, The L-shaped section 41 is tightly connected with the straight pipe section 11, and the outer tube 1, the throat tube 2 and the matching tube 3 are tightly connected together to avoid leakage of liquid and gas. The assembly is simple, and the formed Venturi tube has a simple structure and is easy to maintain and repair. When replacing the throat tube 2, the knob 63 is rotated to loosen the pressing tube 4, and then the pressing tube 4 is rotated to unscrew the connecting strip 5 from the pull plate 64 to separate the pressing tube 4 from the outer tube 1. The tool is inserted into the through groove 8, and then inserted into the groove 9c through the through groove 8, and the throat tube 2 is pried to make the throat tube 2 and the matching tube 3 slide out of the outer tube 1, and then the above assembly steps are installed to replace the throat tube 2 of other specifications. The operation is simple.

[0042] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A venturi tube with adjustable throat diameter, characterized in that: include: An outer tube (1), wherein the outer tube (1) is divided into a straight tube section (11) and a diffusion section (12); A throat pipe (2), wherein the throat pipe (2) is inserted into a straight pipe section (11) on the outer pipe (1) and is slidably connected to an inner side wall of the straight pipe section (11); A matching pipe (3), wherein the matching pipe (3) is inserted into the straight pipe section (11) on the outer pipe (1) and is slidably connected to the inner side wall of the straight pipe section (11); A pressing tube (4) for tightly connecting the outer tube (1), the throat tube (2) and the matching tube (3); the pressing tube (4) is sleeved on the outer tube (1) and is located on the opening of the straight tube section (11); A tightening mechanism (6) is used to lock the pressure tube (4) onto the outer tube (1). The tightening mechanism (6) comprises a mounting plate (61), a threaded rod (62), a knob (63), a pull plate (64) and a slide rod (65); the mounting plate (61) is fixedly mounted on the outer side wall of the outer tube (1), and a threaded rod (62) connected in a threaded manner passes through the mounting plate (61); a knob (63) is fixedly mounted on one end of the threaded rod (62), and a pull plate (64) connected in a rotational manner is mounted on the other end of the threaded rod (62); a slide rod (65) is fixedly mounted on the pull plate (64), and the slide rod (65) passes through the mounting plate (61) and is slidably connected to the mounting plate (61).

2. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: A limiting platform (9) is formed at the junction of the straight pipe section (11) and the diffusion section (12).

3. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: The pressure pipe (4) comprises an L-shaped section (41) and a straight section (42); the L-shaped section (41) is sleeved on the straight pipe section (11) and is slidably connected to the outer side wall of the straight pipe section (11).

4. The venturi tube with adjustable throat diameter according to claim 3, characterized in that: The L-shaped section (41) is provided with two symmetrically arranged connecting strips (5), and the connecting strips (5) and the L-shaped section (41) are integrally formed.

5. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: Two symmetrically arranged positioning grooves (7) are provided on the inner side wall of the straight pipe section (11), and two measuring tubes (9a) are fixedly mounted on the straight pipe section (11).

6. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: The straight pipe section (11) is provided with two symmetrically arranged through grooves (8), and the through grooves (8) are located in the positioning groove (7).

7. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: Two symmetrically arranged limiting strips (9b) are fixedly mounted on the outer side walls of the throat pipe (2) and the matching pipe (3), and through holes (9d) are provided on the throat pipe (2) and the matching pipe (3).

8. The venturi tube with adjustable throat diameter according to claim 7, characterized in that: The limiting strip (9b) located on the throat pipe (2) is provided with a groove (9c).

9. The venturi tube with adjustable throat diameter according to claim 1, characterized in that: A fixing plate (9e) is fixedly mounted on the outer side wall of the outer tube (1).

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