Device and method for measuring the flow rate of downer particles

Abstract

The embodiment of the present application provides a device and a method for measuring the flow of downgoing particles. The device for measuring the flow of downgoing particles comprises a traction member, a flow member, a dynamometer and a sheath. The flow member is hung at one end of the traction member and can naturally droop under the action of gravity. The dynamometer is arranged outside a flow pipe. The sheath has an inner cavity. One end of the sheath is arranged on the flow pipe, the other end of the sheath extends into the flow pipe, and the other end of the sheath has a downward opening. One end of the traction member is connected with the dynamometer. The traction member penetrates into the inner cavity, and the traction member penetrates out of the inner cavity from the opening. Therefore, the device for measuring the flow of downgoing particles has the advantages of long service life, high accuracy of measured data and difficulty in blocking the sheath.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid flow measurement, in particular to a device and a method for measuring the flow of downgoing particles. BACKGROUND

[0002] For fluids with high temperature, high pressure and strong radioactivity characteristics, the currently more suitable flow measurement instrument is mainly a throttling flow measurement device, but the measurement range of such instrument is relatively narrow; in the related art, a target rod and a target plate are combined for measurement, but the target rod is prone to bending and deformation during use, which affects the measurement results and has a large deviation. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, an embodiment of the present application proposes a device for measuring the flow of downgoing particles. The device for measuring the flow of downgoing particles has the advantages of not being prone to clogging the sheath, long service life and high accuracy of measured data.

[0004] An embodiment of the present application also proposes a method for measuring the flow of downgoing particles.

[0005] The device for measuring the flow of downgoing particles of the present application has the advantages of not being prone to clogging the sheath, long service life and high accuracy of measured data.

[0006] The device for measuring the flow of downgoing particles of the present application has the advantages of not being prone to clogging the sheath, long service life and high accuracy of measured data.

[0007] The device for measuring the flow of downgoing particles of the present application has the advantages of not being prone to clogging the sheath, long service life and high accuracy of measured data.

[0008] In some embodiments, the sheath comprises a vertical portion and an extension portion, the vertical portion is located in the flow pipe, the opening is arranged at the lower end of the vertical portion, the upper end of the vertical portion is connected with one end of the extension portion, the other end of the extension portion extends along the width direction of the flow pipe and extends out of the flow pipe, the measuring device further comprises a first turning piece, the first turning piece is arranged in the inner cavity, the first turning piece is arranged at the connection between the extension portion and the vertical portion, the traction member passes around the first turning piece, and the traction member naturally drops below the vertical portion.

[0009] In some embodiments, the vertical portion is located at a position close to the middle of the flow pipe, and the extension portion is a horizontal pipe.

[0010] In some embodiments, the extension portion is a bent pipe, and the bent pipe is provided with a second turning piece at the bending position, and a part of the bent pipe extends into the flow pipe in the width direction of the flow pipe.

[0011] In some embodiments, the bent pipe comprises a first segment, a second segment and a third segment connected in sequence, one end of the first segment is connected with the upper end of the vertical portion, the other end of the first segment extends towards the inner wall of the flow pipe, the second segment is arranged at a position adjacent to the inner wall of the flow pipe in the up-down direction, the lower end of the second segment is connected with the other end of the first segment, the upper end of the second segment is connected with the third segment, and the second turning piece is two, one of the second turning pieces is arranged at the connection between the first segment and the second segment, and the other second turning piece is arranged at the connection between the second segment and the third segment.

[0012] In some embodiments, each of the first turning piece and the second turning piece comprises a support frame and a pulley arranged on the support frame, the support frame is arranged on the sheath, the pulley is suspended in the inner cavity, and the traction member is arranged on the pulley.

[0013] In some embodiments, the number of each of the traction member and the extension portion is multiple, multiple traction members are arranged one-to-one with multiple sheaths, each traction member is connected with the upper end of the flow member, and one end of each extension portion is connected with the upper end of the vertical portion.

[0014] In some embodiments, multiple extension portions are arranged in the circumferential direction of the flow member.

[0015] In some embodiments, the sheath comprises an extension portion and at least two vertical portions, each vertical portion is provided with a flow member below, each flow member is separately connected with a traction member, and each traction member is connected with the force gauge.

[0016] In some embodiments, the vertical part is internally provided with a baffle sleeve, the outer wall of the baffle sleeve is connected with the interior of the vertical part, the baffle sleeve has a through hole, and the traction member penetrates through the through hole.

[0017] In some embodiments, the area of the flow member projected on a horizontal plane is more than 2 times the area of the vertical part projected on the horizontal plane.

[0018] In some embodiments, the area of the flow member projected on a horizontal plane is 10-20 times the area of the vertical part projected on the horizontal plane.

[0019] In some embodiments, the flow member is a sphere, a cylinder or a flat plate.

[0020] The method for measuring the flow of the downward particles according to the embodiments of the present application adopts the traction force borne by the traction member obtained by the device for measuring the flow of the downward particles according to any one of the above, and obtains the flow in the flow pipe by using the relationship between the force meter and the flow of the flowing fluid.

[0021] The relationship between the force meter and the flow of the flowing fluid is as shown in formulas (1) and (2).

[0022]

[0023] In the formulas, Fp is the resultant force of the pressure stress on the cylinder and the stagnation zone, wherein α is a coefficient, D is the diameter of the cylinder, and L is the length of the cylinder; Ft is the resultant force of the shear stress on the cylinder and the stagnation zone, wherein β is a coefficient, μ is the apparent viscosity of the particle flow; θ1 is the central angle corresponding to the center of symmetry of the conical dead zone and the center of the circle corresponding to the end point of the conical dead zone; θ2 is the central angle corresponding to the center of symmetry of the conical dead zone and the center of the circle corresponding to the starting point of the flow separation; ρ is the density of the particle fluid; v is the velocity of the fluid; after the flow resistance F around the flow is measured by the force meter, the particle velocity is obtained according to formula (1), and the particle flow G is obtained according to the following formula:

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a structural schematic diagram of a device for measuring the flow of downward particles according to an embodiment of the present application.

[0026] Figure 2 FIG. 2 is a structural schematic diagram of a device for measuring the flow of downward particles according to another embodiment of the present application.

[0027] Figure 3 FIG. 3 is a structural schematic diagram of a device for measuring the flow of downward particles according to still another embodiment of the present application.

[0028] Figure 4A top view of the device for measuring the flow of down-flowing particles according to another embodiment of the present application and a flow pipe.

[0029] Figure 5 A structural schematic diagram of the device for measuring the flow of down-flowing particles according to another embodiment of the present application.

[0030] Figure 6 A schematic diagram of the corresponding angle between the force gauge and the conical dead zone in the flow of fluid according to the present application.

[0031] Reference signs:

[0032] Device for measuring the flow of down-flowing particles 100;

[0033] Traction member 1;

[0034] Flow-around member 2;

[0035] Sheath 3; vertical portion 31; extension portion 32; horizontal tube 321; bent tube 322; inner cavity 33;

[0036] Force gauge 4;

[0037] First turning member 5; second turning member 6; blocking sheath 7;

[0038] Flow pipe 200. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0040] Reference is made below to Figures 1-5 Device for measuring the flow of down-flowing particles 100 according to an embodiment of the present application is described.

[0041] Device for measuring the flow of down-flowing particles 100 according to an embodiment of the present application includes traction member 1, flow-around member 2, force gauge 4, and sheath 3. Flow-around member 2 is suspended at one end of traction member 1, and flow-around member 2 can naturally sag under the action of gravity. Force gauge 4 is arranged outside flow pipe 200. Sheath 3 has inner cavity 33. One end of sheath 3 is arranged on flow pipe 200, and the other end of sheath 3 extends into inner cavity 33 of flow pipe 200. The other end of sheath 3 has a downward opening. One end of traction member 1 is connected to force gauge 4. Traction member 1 penetrates into inner cavity 33, and traction member 1 penetrates out of inner cavity 33 from the opening.

[0042] The device 100 for measuring the flow of the downward particles in the embodiment of the present application, the flow follower 2 is pulled by the pulling member 1, the part of the sheath 3 inserted into the flow pipe 200 has the downward opening, and one end of the pulling member 1 is connected with the force gauge 4, the flow follower 2 is pulled by the one end of the pulling member 1 located in the flow pipe 200, the change of the force of the pulling member is measured by the force gauge, the size of the impact force of the flow follower 2 is obtained, and then the flow of the downward particles is measured. Compared with the method for measuring the flow of the downward particles by using the target rod, since the opening of the one end of the sheath 3 located in the flow pipe 200 is downward, the downward particles are not easy to enter into the sheath 3 due to the gravity, and the problem of the sheath 3 being blocked by the downward particles is avoided; meanwhile, the flow follower 2 is pulled by the pulling member 1, the force direction of the pulling member 1 is consistent with the length direction of the pulling member 1, and the pulling member 1 has the advantage of small deformation after being impacted by the downward particles (the target rod is easy to be bent and deformed), and then the accuracy of the measurement and the service life of the device are improved.

[0043] The device 100 for measuring the flow of the downward particles in the embodiment of the present application has the advantages of the sheath 3 not being easy to be blocked, long service life and high accuracy of the measured data.

[0044] As shown in Figures 1-5 , the sheath 3 includes the vertical part 31 and the extension part 32, the vertical part 31 is located in the flow pipe 200, the opening is arranged at the lower end of the vertical part 31, the upper end of the vertical part 31 is connected with one end of the extension part 32, the other end of the extension part 32 extends along the width direction of the flow pipe 200 and extends out of the flow pipe 200, and the measuring device further includes the first turning member 5, the first turning member 5 is arranged in the inner cavity, the first turning member 5 is arranged at the connection position of the extension part 32 and the vertical part 31, the pulling member 1 passes around the first turning member 5, and the pulling member 1 naturally drops below the vertical part 31.

[0045] The device 100 for measuring the flow of the downward particles in the embodiment of the present application, by dividing the sheath 3 into the vertical part 31 and the extension part 32, the direction of the pulling member 1 located in the vertical part 31 is consistent with the vertical part 31. In this way, the flow follower 2 may shake to a certain extent after being impacted by the downward particles, the problem that the pulling member 1 contacts the sheath 3 and affects the accuracy of the measurement during the shaking process of the flow follower 2 is avoided, and the device has the advantage of high measurement accuracy.

[0046] In addition, by arranging the first turning member 5 to reverse the vertical pulling force, the sheath 3 can be flexibly arranged according to the space outside the flow pipe 200, and the flexibility of the arrangement of the sheath 3 is improved.

[0047] As shown in Figure 1 , the vertical part 31 is located at the position close to the middle part of the flow pipe 200, the extension part 32 is the horizontal pipe 321, the first turning member 5 is arranged at the connection position of the extension part 32 and the vertical part 31, the pulling member 1 passes around the first turning member 5, and the pulling member 1 naturally drops below the vertical part 31.

[0048] The device 100 for measuring the flow of the downgoing particles according to the embodiment of the present application has the advantages of convenient installation and fixation by setting the extension part 32 as the horizontal pipe 321.

[0049] The present application is not limited to this, for example, in other embodiments, as shown in Figure 2 The extension part 32 is the bent pipe 322, the bent pipe 322 is provided with the second turning part 6 at the bending position, and a part of the bent pipe 322 extends into the flow pipe 200 in the width direction of the flow pipe 200. In other words, the bent pipe 322 includes multiple protection pipes.

[0050] The device 100 for measuring the flow of the downgoing particles according to the embodiment of the present application reduces the length of the force arm of each protection pipe in the horizontal direction after the bending of the bent pipe 322, thereby improving the stability of the structure. In addition, the arrangement position of the appropriate force gauge 4 can be adjusted as needed, thereby improving the flexibility of the structure arrangement.

[0051] Optionally, the bent pipe 322 includes a first segment, a second segment and a third segment connected in sequence, one end of the first segment is connected with the upper end of the vertical part 31, the other end of the first segment extends to the position adjacent to the inner wall of the flow pipe 200, the second segment is arranged at the position adjacent to the inner wall of the flow pipe 200 in the up-down direction, the lower end of the second segment is connected with the other end of the first segment, the upper end of the second segment is connected with the third segment, the second turning part 6 is two, one of the second turning parts 6 is arranged at the connection position of the first segment and the second segment, and the other second turning part 6 is arranged at the connection position of the second segment and the third segment, as shown in Figure 2 In other words, the second segment is adjacent to the inner wall of the flow pipe 200.

[0052] The device 100 for measuring the flow of the downgoing particles according to the embodiment of the present application can reduce the length of the third segment in the horizontal direction by arranging the second segment adjacent to the inner wall of the flow pipe 200, thereby reducing the length of the third segment in the horizontal direction (force arm) and further improving the stability of the structure.

[0053] The present application is not limited to this, for example, in other embodiments, as shown in Figure 3 and Figure 4 The number of each of the traction part 1 and the extension part 32 is multiple, the multiple traction parts 1 are arranged one by one with the multiple sheaths 3, each traction part 1 is connected with the upper end of the flow-around part 2, and one end of each extension part 32 is connected with the upper end of the vertical part 31. In other words, the multiple traction parts 1 pull the same flow-around part 2.

[0054] The device 100 for measuring the flow of the downgoing particles of the embodiment of the present application can avoid the problem of invalidation of the device 100 for measuring the flow of the downgoing particles caused by the breakage of one of the plurality of traction members 1, so as to ensure the smooth performance of the measurement after the breakage of one of the plurality of traction members 1, and has the function of double insurance.

[0055] Optionally, the traction member 1 can be an external locking chain.

[0056] As shown in Figure 4 , the plurality of extension portions 32 are arranged at intervals along the circumference of the flow member 2. For example, the number of each of the traction member 1 and the extension portion 32 is four, and the four traction members 1 are arranged at intervals along the circumference of the flow member 2.

[0057] The present application is not limited thereto, for example, in other embodiments, as shown in Figure 5 , the sheath 3 comprises the extension portion 32 and at least two vertical portions 31, each vertical portion 31 is provided with the flow member 2 below, each flow member 2 is individually connected with the traction member 1, and each traction member 1 is connected with the force gauge 4. It can be understood that the number of the flow member 2 and the traction member 1 matches the number of the vertical portion 31. For example, the extension portion 32 is connected with two vertical portions 31 below, and two flow members 2 are arranged to correspondingly and naturally hang below the two vertical portions 31, and each traction member 1 corresponds to the traction of the flow member 2.

[0058] The device 100 for measuring the flow of the downgoing particles of the embodiment of the present application can adapt to the problem of the pipe body with excessively large pipe diameter of the flow pipe 200 to reduce the accuracy of the measurement, so as to improve the accuracy of the flow measurement in the flow pipe 200.

[0059] As shown in Figures 1-5 , each of the first diversion member 5 and the second diversion member 6 comprises a support frame and a pulley arranged on the support frame, the support frame is arranged on the sheath 3, the pulley is suspended in the inner cavity, and the traction member 1 is arranged on the pulley. In other words, the first diversion member 5 comprises a support frame and a pulley arranged on the support frame, and the second diversion member 6 comprises a support frame and a pulley arranged on the support frame.

[0060] The device 100 for measuring the flow of the downgoing particles of the embodiment of the present application has the advantages of small force loss and high mechanical transmission efficiency by using the pulley as the diversion member.

[0061] As shown in Figure 1 , the inside of the vertical portion 31 is provided with a blocking sleeve 7, the outer wall of the blocking sleeve 7 is connected with the inside of the vertical portion 31, the blocking sleeve 7 has a through hole, and the traction member 1 penetrates through the through hole.

[0062] The device 100 for measuring the flow of the down-flowing particles according to the embodiment of the present application can avoid the problem that the particles in the flow channel reverse flow into the sheath 3 to block the sheath 3 by arranging the baffle 7 in the interior of the vertical part 31, thereby improving the stability and accuracy of the measurement.

[0063] The area of the projection of the flow-around member 2 on a horizontal plane is more than twice the area of the projection of the vertical part 31 on the horizontal plane.

[0064] The device 100 for measuring the flow of the down-flowing particles according to the embodiment of the present application can ensure that sufficient down-flowing particles can smoothly fall onto the flow-around member 2 by reducing the obstruction of the vertical part 31 to the down-flowing particles, thereby further improving the accuracy of the measurement.

[0065] As shown in Figure 1 the flow-around member 2 is a sphere.

[0066] The present application is not limited thereto, for example, in other embodiments, the flow-around member 2 can also be a cylinder or a flat plate. The flow-around member 2 can be made of heat-resistant alloy steel.

[0067] The pulling force borne by the pulling member 1 obtained by using the device 100 for measuring the flow of the down-flowing particles according to any one of the above embodiments is used to obtain the flow in the flow pipe 200 by using the relationship between the force meter 4 and the flow of the flowing fluid;

[0068] The relationship between the force meter 4 and the flow of the flowing fluid is as shown in formulas (1) and (2)

[0069]

[0070] In the formulas, Fp is the resultant force of the pressure stress on the cylinder and the stagnation zone, where α is a coefficient, D is the diameter of the cylinder, and L is the length of the cylinder; Ft is the resultant force of the shear stress on the cylinder and the stagnation zone, where β is a coefficient, μ is the apparent viscosity of the particle flow; θ1 is the central angle corresponding to the center of symmetry of the conical dead zone and the center of the circle corresponding to the end point of the conical dead zone; θ2 is the central angle corresponding to the center of symmetry of the conical dead zone and the starting point of the flow separation; ρ is the density of the particle fluid; v is the velocity of the fluid; after the flow resistance F is measured by the force meter, the particle velocity is obtained by formula (1), and the particle flow G is obtained according to the following formula:

[0071]

[0072] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0073] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0074] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0075] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0076] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" or "including" and their derivatives, mean "including but not limited to". The terms "coupled" and "connected", along with their derivatives, mean "directly or indirectly connected".

[0077] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the present disclosure, and the changes, modifications, replacements and variations made by those skilled in the art to the above-mentioned embodiments are within the protection scope of the present disclosure.

Claims

1. A method for measuring the flow rate of downward particles, characterized in that The device used in the method for measuring the flow rate of downward particles includes: traction parts; A flow-around member, the flow-around member is suspended at one end of the traction member, the flow-around member can droop naturally under the action of gravity, and the flow-around member is cylindrical; a dynamometer for placement on an outside of the flow tube; and a sheath having an inner cavity, one end of the sheath being disposed on the flow tube, the other end of the sheath extending into the flow tube, and the other end of the sheath having a downward opening, one end of the traction member being connected to the dynamometer, the traction member passing through the inner cavity, and the traction member passing through the inner cavity through the opening; The method for measuring the flow rate of the downward particles uses the traction force exerted on the traction member obtained by the device, and uses the relationship between the dynamometer and the downward fluid flow rate to obtain the flow rate in the flow tube; The relationship between the dynamometer and the downward fluid flow rate is as shown in formulas (1) and (2): Where Fp is the resultant force generated by the compressive stress on the cylinder and the stagnant zone, where α is the coefficient, D is the cylinder diameter, and L is the cylinder length; Ft is the resultant force generated by the shear stress on the cylinder and the stagnant zone, where β is the coefficient, and μ is the apparent viscosity of the particle flow; θ1 is the central angle between the symmetry center of the corresponding conical dead zone and the end point of the conical dead zone; θ2 is the central angle between the symmetry center of the corresponding conical dead zone and the starting point of flow separation; ρ is the density of the particle fluid; v is the velocity of the fluid; after the flow resistance F is measured by the dynamometer, the particle velocity is obtained by formula (1), and the particle flow rate G is obtained according to the following formula:

2. The method for measuring the flow of downward particles according to claim 1, characterized in that: The sheath includes a vertical portion and an extension portion, the vertical portion is located in the flow tube, the opening is arranged at the lower end of the vertical portion, the upper end of the vertical portion is connected to one end of the extension portion, and the other end of the extension portion extends along the width direction of the flow tube and extends out of the flow tube. The device further includes a first steering member, the first steering member is arranged in the inner cavity, the first steering member is arranged at the connection between the extension portion and the vertical portion, the traction member bypasses the first steering member, and the traction member naturally hangs down below the vertical portion.

3. The method for measuring the flow of downward particles according to claim 2, characterized in that: The vertical portion is located near the middle of the flow tube, and the extended portion is a horizontal tube; Alternatively, the extension portion is a bent tube, a second deflection member is provided at each bend of the bent tube, and a portion of the bent tube extends into the flow tube in the width direction of the flow tube; The bent tube includes a first section, a second section, and a third section connected in sequence, one end of the first section is connected to the upper end of the vertical portion, the other end of the first section extends toward the inner wall of the flow tube, the second section is arranged at a position adjacent to the inner wall of the flow tube in the up and down directions, the lower end of the second section is connected to the other end of the first section, and the upper end of the second section is connected to the third section, and there are two second steering members, one of which is arranged at the connection between the first section and the second section, and the other second steering member is arranged at the connection between the second section and the third section.

4. The method for measuring the flow of downward particles according to claim 3, characterized in that: Each of the first steering member and the second steering member includes a support frame and a pulley provided on the support frame, the support frame is provided on the sheath, the pulley is suspended in the inner cavity, and the traction member is mounted on the pulley.

5. The method for measuring the flow of downward particles according to claim 2, characterized in that: There are multiple traction members and multiple extensions, and the traction members are arranged in a one-to-one correspondence with the protective sleeves. Each traction member is connected to the upper end of the flow-circling member, and one end of each extension is connected to the upper end of the vertical portion. A plurality of the extension portions are arranged at intervals along the circumference of the flow deflector.

6. The method for measuring the flow of downward particles according to claim 2, characterized in that: The sheath includes an extension portion and at least two vertical portions. A flow-around member is provided under each vertical portion. Each flow-around member is individually connected to a traction member, and each traction member is connected to the dynamometer.

7. The method for measuring the flow rate of downward particles according to any one of claims 2 to 6, characterized in that: A blocking sleeve is provided inside the vertical portion, an outer wall of the blocking sleeve is connected to the inside of the vertical portion, the blocking sleeve has a through hole, and the traction member passes through the through hole.

8. The method for measuring the flow of downward particles according to any one of claims 2 to 6, characterized in that: The projected area of ​​the flow detour member on the horizontal plane is more than twice the projected area of ​​the vertical portion on the horizontal plane.

9. The method for measuring the flow of downward particles according to claim 8, characterized in that: The projected area of ​​the flow detour member on the horizontal plane is 10 to 20 times the projected area of ​​the vertical portion on the horizontal plane.

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