JP2015073934A - Classifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a classifier which performs sampling of flue gas inside a flue irrespective of a size of the flue and exactly classifies particulate materials contained in the flue gas.SOLUTION: A classifier includes: a cylindrical main body 10; an inflow nozzle 63 which is disposed on an end surface in the axial direction of the main body 10 and causes fluid to flow thereinto; a main suction nozzle 40 which is projected from the another end surface in the axial direction of the main body 10 along the axis direction; acceleration nozzles 15, 24 which accelerate fluid flowing through an inner part of the main body 10; collection nozzles 16, 25 which are arranged opposite to the acceleration nozzles 15, 24 and suck a part of fluid flowing out from the acceleration nozzles 15, 24; and sub suction nozzles 41, 42 which are connected with the collection nozzles 16, 25 and are projected in the axial direction from the same end surface as the main suction nozzle 40.

Description

  The present invention relates to a classification device for classifying and collecting particulate matter contained in a gas passing through a flue.

  Flue gas emitted from fixed sources such as chimneys of thermal power plants, waste treatment plants, and chemical plants contains particulate matter with a small particle size, and the particulate matter contributes to air pollution. It has become.

  Among the particulate substances, it is known that when a particulate substance having a particle diameter of less than 10 μm is inhaled into the human body together with exhaled air, it has an adverse effect on health. Further, among the particulate substances having a particle diameter of less than 10 μm, a substance having a particle diameter of less than 2.5 μm (hereinafter referred to as PM2.5) easily enters deep into the lungs when inhaled by the human body, and is serious. There is concern about causing health damage.

  In order to quantitatively compare the concentration of PM2.5 measured at each fixed source, an international standard (ISO 13271, June 18, 2012) is used for measuring the concentration of PM2.5 discharged from the fixed source. Issued) and Japanese Industrial Standards (JIS Z 7152, issued on August 20, 2013).

  In the above-mentioned international standard and Japanese industrial standard, as a classification device for classifying suspended particulate matter when measuring the concentration of PM2.5 at a fixed source, a virtual impactor with little change in accuracy due to concentration is used. Yes. The virtual impactor includes an accelerating nozzle that accelerates the exhaust gas before classification, and a collection nozzle that is arranged to face the output port of the accelerating nozzle at a certain distance. And, by sucking the exhaust gas from the collection nozzle and sucking the exhaust gas to the side through the gap between the acceleration nozzle and the collection nozzle, the light particulate matter is moved along the flow of the exhaust gas. Aspirate.

At this time, the flow rate of the exhaust gas sucked from the gap between the acceleration nozzle and the collection nozzle is increased with respect to the flow rate of the exhaust gas sucked from the collection nozzle (for example, about 10 times). Thereby, most of the exhaust gas flowing out from the acceleration nozzle flows out from the gap, and a small amount of exhaust gas is sucked into the collection nozzle. Thereby, the particulate matter having a small weight, that is, the particulate matter having a small particle diameter flows on the exhaust gas flowing out from the gap. On the other hand, the particulate matter having a large weight, that is, the particulate matter having a large particle diameter, is accelerated when passing through the acceleration nozzle and flows into the collection nozzle by inertia force.
The virtual impactor classifies the particulate matter using such characteristics. Then, classification is performed by adjusting the inner diameter of the acceleration nozzle and the collection nozzle, the flow rate of exhaust gas sucked from the gap between the acceleration nozzle and the collection nozzle, and the flow rate of exhaust gas sucked from the collection nozzle. The particle size of the particulate matter is adjusted.

  In the international standard and the Japanese industrial standard, the virtual impactor classifies the particulate matter having a particle size of 10 μm or more and the particulate matter having a particle size of less than 10 μm and 2.5 μm or more (hereinafter referred to as PM10). In addition, a multistage virtual impactor that collects particulate matter (hereinafter referred to as PM2.5) having a particle diameter of less than 2.5 μm is used (see Non-Patent Document 1, Non-Patent Document 2, etc.).

ISO 13271 "Stationary source emissions- Determination of PM10 / PM2.5 mass concentration in flue gas-Measurement at higher concentrations by use of virtual impactors" JIS Z 7152 “Method for measuring PM10 / PM2.5 mass concentration in exhaust gas using virtual impactor”

  In the virtual impactor described in Non-Patent Document 1 and Non-Patent Document 2, a plurality of stages of classification units arranged on the same axis are arranged side by side on the same axis. And the said virtual impactor becomes a structure which attracts | sucks exhaust gas from the suction nozzle provided so that it might protrude outside from the outer periphery of a main-body part.

  In the case of such a virtual impactor in which the suction nozzle extends from the outer periphery of the main body, the outer shape becomes large, and the inner diameter of the space into which the virtual impactor can be inserted is limited. The virtual impactor must be manufactured, which is inefficient.

  Also, when moving the virtual impactor or inserting it into a fixed source, there is a possibility that the suction nozzle that protrudes outside will come into contact with an external object and be damaged, resulting in poor workability. . Furthermore, a tube for connecting to a device for sucking fluid is attached to the suction nozzle, but the tube attachment portion is exposed to the outside, so that the tube is damaged by contact or pulling. Or easily come off the suction nozzle.

  Accordingly, the present invention has been made to solve the above-described problem, sampling the flue gas in the flue regardless of the size of the flue, and the particulate matter contained in the flue gas An object of the present invention is to provide a classification device that can accurately classify items.

  In order to achieve the above object, the present invention is a classification device for classifying a powder having a size within a predetermined range that is inserted into a tube and contained in a fluid flowing through the tube, and a cylindrical main body, An inflow nozzle that is provided on an end surface in the axial direction of the main body portion and allows the fluid to flow in, and a main body that sucks the fluid flowing into the main body portion and protrudes in the axial direction from the other end surface in the axial direction of the main body portion A suction nozzle, a classification unit that classifies the powder contained in the fluid in one or more stages disposed inside the main body, and a collection filter that is disposed downstream of the classification unit. The classification unit is an acceleration nozzle that accelerates the fluid flowing inside the main body, and a collection nozzle that is disposed to face the acceleration nozzle and sucks a part of the fluid that flows out of the acceleration nozzle; Connected to the collection nozzle and the main suction nozzle; Flip characterized in that it comprises an auxiliary suction nozzle which projects axially from the end face.

  According to this configuration, both the main suction nozzle and the sub suction nozzle protrude in the axial direction from the axial end of the main body. Thereby, since no protrusion is arranged on the outer periphery of the main body, when the classification device is inserted into the inside of the tube body or into the work hole provided in the tube body, there are few obstacles and the operation is easy.

  Further, since there are no protrusions in the outer peripheral direction of the main body, the hole for inserting the classification device may be small, and the fluid flowing inside can be sampled even if the inner diameter of the tube body is small.

  In the above configuration, a main suction tube and a sub suction tube are attached to each of the main suction nozzle and the sub suction nozzle, and are formed at positions corresponding to the main suction nozzle and the sub suction nozzle. An attachment member having a through hole is provided, and the main suction tube and the sub suction tube inserted into the through hole are connected to the main suction nozzle and the sub suction nozzle, respectively, and the attachment member is brought close to the main body portion to thereby make the main suction tube and the sub suction tube The tube may be clamped.

  In the above configuration, the main body portion has a configuration that can be divided into a plurality of divided members in the axial direction, and the divided member is fitted in an inlay structure with the adjacent divided member and the central axis of the main body portion as a center. A positioning pin that protrudes in the axial direction provided on one side may be fitted in a recess provided on the other axial end surface while having a fitting part to be fitted.

  In order to achieve the above object, the present invention is a classification device that is inserted into a tubular body and collects powder having a predetermined range of size contained in a fluid flowing through the tubular body. An inflow nozzle that is provided on an end surface in the axial direction of the main body and that allows the fluid to flow in; a main suction nozzle that sucks the fluid that flows into the main body; and a first stage disposed in the main body Or the classification part which classifies the powder contained in the fluid in a plurality of stages, and the collection filter arranged on the downstream side of the classification part, the fluid flowing through the inside of the main body part An accelerating nozzle for accelerating the gas, a collecting nozzle that is disposed opposite to the accelerating nozzle and sucks a part of the fluid that flows out of the accelerating nozzle, and is connected to the collecting nozzle, and fluid is drawn from the collecting nozzle. A sub-suction nozzle for sucking, and the main body Has a structure that can be divided into a plurality of divided members in the axial direction, and the divided members have a fitting portion that fits with an adjacent divided member with an inlay structure centering on the central axis of the main body portion. In addition, a positioning pin provided in one side and protruding in the axial direction is fitted into a recess provided in the other axial end surface.

  According to this structure, even if force acts on a main-body part by providing the fitting part of an inlay structure, since it can receive the force in a fitting part, it can control that a division member is damaged. Is possible.

  The said structure WHEREIN: You may equip the downstream edge part of the said main-body part with the cylindrical holding member which can be attached or detached so that the said main suction nozzle and the said sub suction nozzle may be located inside.

  In the above configuration, the gripping member can be divided into a plurality of parts, and has a screw fitting portion that can screw the divided members, and the screw fitting portion is formed on one member. You may provide the nut member for locking | loosening attached to the external thread.

  In the above configuration, the suction portion of the collection nozzle may be formed with a curved chamfer.

  The said structure WHEREIN: The said inflow nozzle may be formed so that attachment or detachment with respect to the said main-body part is possible.

  The said structure WHEREIN: The said inflow nozzle may have a chamber part for suppressing a flow rate inside.

  The said structure WHEREIN: The said main-body part may contain the outer peripheral surface the cylinder surface and the plane which cut off a part of this cylinder surface.

  According to the present invention, it is possible to provide a classification device capable of sampling the flue gas in the flue regardless of the size of the flue and accurately classifying the particulate matter contained in the flue gas.

It is a perspective view of a virtual impactor which is an example of a classification device concerning the present invention. It is the schematic of the state which attached the virtual impactor shown in FIG. 1 to the flue which is a fixed generation source. It is an axial direction projection view of the virtual impactor shown in FIG. It is sectional drawing which cut | disconnected the virtual impactor shown in FIG. 3 by the IV-IV line. It is sectional drawing which cut | disconnected the virtual impactor shown in FIG. 3 by the VV line. It is sectional drawing of the inflow part used for the virtual impactor shown in FIG. It is sectional drawing of the holding part used for the virtual impactor shown in FIG. It is a top view of the 1st division member. It is a top view of the 2nd division member. It is a top view of a 3rd division member. It is a top view of a filter part. It is a top view of the 4th division member. It is a top view of a 5th division member. It is a top view of the 6th division member. It is a top view of the 7th division member. It is a top view of the 8th division member. It is the figure seen from FIG. 10B and the other side of the 8th division member. It is a figure which shows the classification state in a 1st step classification part. It is sectional drawing of the inflow nozzle used for the virtual impactor concerning this invention. It is sectional drawing which shows the state which has attached the virtual impactor to the curved part of a flue. It is sectional drawing of the other example of an inflow nozzle. It is an expanded sectional view of other examples of a virtual impactor which is a classification device concerning the present invention.

  A classification device according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view of a virtual impactor that is an example of a classification device according to the present invention, and FIG. 2 is a schematic view of a state in which the virtual impactor shown in FIG. 1 is attached to a flue that is a fixed generation source.

  As shown in FIG. 2, the virtual impactor VI samples exhaust gas flowing through a fixed source of particulate matter such as a flue (chimney) Ep, and the particulate matter contained in the exhaust gas has a particle size. It is a device that classifies (classifies) and collects each. Note that the virtual impactor VI according to the present embodiment is compliant with international standards (ISO 13271) and Japanese Industrial Standards (JIS Z 7152). That is, the virtual impactor VI classifies a particulate material having a particle size of 10 μm or more, a particulate material having a particle size of less than 10 μm and 2.5 μm or more, and a particulate material having a particle size of less than 2.5 μm. This is a multistage virtual impactor having a configuration for collecting.

  A virtual impactor VI shown in FIG. 1 is detachable from a cylindrical main body 10, an inflow portion 60 detachably attached to an upstream end of the main body 10, and a downstream end of the main body 10. And a gripping member 70 to be attached. As shown in FIG. 2, the virtual impactor VI is inserted into a work hole Ins formed in the outer peripheral wall of the flue Ep so that the inflow portion 60 is positioned inside the flue Ep. Although details will be described later, the virtual impactor VI takes (samples) exhaust gas flowing inside the flue Ep from the inflow portion 60.

  As shown in FIG. 1, the virtual impactor VI has a first-stage classification part A1 for classifying / collecting particulate matter having a particle size of 10 μm or more from the upstream side, a particle shape having a particle size of less than 10 μm and 2.5 μm or more. A second-stage classification part A2 for classifying / collecting substances and a collection part A3 for collecting particulate substances having a particle diameter of less than 2.5 μm are provided. As shown in FIG. 1, the first-stage classification unit A1, the second-stage classification unit A2, and the collection unit A3 are connected in the axial direction.

  The detailed structure of the virtual impactor VI according to the present invention will be described with reference to the drawings. 3 is an axial projection of the virtual impactor shown in FIG. 1, and FIG. 4 is a sectional view of the virtual impactor shown in FIG. 3 cut along the line IV-IV. FIG. 5 is a cross-sectional view of the virtual impactor shown in FIG. 3 taken along line VV. 6 is a cross-sectional view of an inflow portion used in the virtual impactor shown in FIG. FIG. 7 is a cross-sectional view of a gripping part used in the virtual impactor shown in FIG.

  As shown in FIGS. 4 and 5, the main body portion 10 of the virtual impactor VI has a cylindrical shape, and the inflow portion 60 is connected to the upstream end portion of the main end portion 10. Note that the gripping portion 70 is connected to the downstream end portion of the main body portion 10.

  As shown in FIG. 6, the inflow portion 60 is connected to the intake port 61 for taking in the exhaust gas flowing through the flue Ep, the tubular intake pipe 62 having the intake port 61 attached to the tip, and the intake pipe 62. And an inflow nozzle 63.

  The intake port 61 is a member that takes in exhaust gas flowing through the flue Ep. The intake port 61 has a tapered shape with a tapered tip (tapered). And the intake port 61 is arrange | positioned so that a front-end | tip part may become the upstream of the exhaust gas which flows through the flue Ep. In this way, by arranging the tapered tapered tip on the upstream side, it is possible to suppress the disturbance of the flow of exhaust gas in the flue Ep. In addition, the intake port 61 has an open end, and takes in exhaust gas from the opening.

  The exhaust gas taken in from the intake 61 flows into the intake pipe 62. As shown in FIG. 6, the intake pipe 62 has a shape curved by 90 degrees. The flow direction of the exhaust gas flowing in from the intake port 61 is converted by 90 degrees. On the downstream side of the intake pipe 62, an attachment 621 for attaching to the attachment portion 632 of the inflow pipe 63 is provided.

  The inflow nozzle 63 has an attachment portion 632 for attaching the attachment 621 on the upstream side, and includes a concave portion for attaching the attachment 621 and a male screw portion for screwing the fixing nut 64. A packing Pkn is provided between the attachment portion 632 of the inflow nozzle 63 and the attachment 621, and the intake pipe 62 and the inflow nozzle 63 are connected in an airtight manner.

  The inflow nozzle 63 is a cylindrical member having a shape that expands toward the downstream side, in other words, a conical shape. On the downstream side of the inflow nozzle 63, there is provided an attachment portion 631 attached to an attachment rib 12 described later of the main body portion 10. And the packing Pkn is also attached to the attachment part 631, and it attaches with the inflow nozzle 63 and the main-body part 10 (attachment rib 12) maintaining airtightness. The internal space 630 of the inflow nozzle 63 has a conical shape with the same downstream side as the outer surface, and the exhaust gas flowing in from the inflow nozzle 63 is sent to all the acceleration nozzles 15 described later of the main body 10. Yes.

  As shown in FIG. 2, the virtual impactor VI has an exhaust gas flowing inside the flue Ep by disposing at least the opening portion of the intake port 61 of the inflow portion 60 toward the upstream side of the flow of airflow in the flue Ep. Can be effectively sampled. By configuring in this way, the main body portion 10 having a large weight of the virtual impactor VI can be supported by being brought into contact with the edge portion of the working hole Ins formed in the side wall of the flue Ep.

  In the virtual impactor VI according to the present invention, the main body portion 10 is supported by the edge portion of the work hole Ins and the grip portion 70 is supported. That is, when the exhaust gas in the flue Ep is sampled, the main body 10 having a large weight is supported, so that it acts on the grip 70 as compared with the conventional configuration in which the main body 10 is completely accommodated in the flue Ep. It is possible to keep the force (stress, moment) to be small. Furthermore, even when some trouble occurs, the main body 10 is supported by the work hole Ins, so that the main body 10 can be prevented from falling into the flue Ep. Thereby, the big accident by the fall into the flue Ep of the main-body part 10 which is a heavy article can be suppressed.

  The virtual impactor VI is inserted into the flue Ep through a work hole Ins provided in the side wall of the flue Ep. At this time, in order to smoothly insert / draw the virtual impactor VI, the inflow portion 60 is preferably formed so as to be within the axial projection plane of the main body portion 10.

  Next, the main body 10 will be described. As shown in FIG. 1, the main body 10 has an outer peripheral surface that connects a cylindrical surface portion and a flat surface portion 100 obtained by cutting a part of the cylinder. The main body 10 can be divided into eight divided members of the first divided member 10a to the eighth divided member 10h from the upstream side in the axial direction. The first-stage classification portion A1 can be divided into the first divided member 10a to the third divided member 10c, and the second-stage classified portion A2 can be divided into the fourth divided member 10d to the sixth divided member 10f. Moreover, the collection part A3 can be divided into a seventh divided member 10g and an eighth divided member 10h.

  8A is a plan view of the first divided member, FIG. 8B is a plan view of the second divided member, FIG. 8C is a plan view of the third divided member, and FIG. 8D is a plan view of the filter portion. 9A is a plan view of the fourth divided member, FIG. 9B is a plan view of the fifth divided member, and FIG. 9C is a plan view of the sixth divided member. 10A is a plan view of the seventh divided member, FIG. 10B is a plan view of the eighth divided member, and FIG. 10C is a view of the eighth divided member as viewed from the opposite side to FIG. 10B.

  As shown in FIGS. 3 and 4, the first-stage classification unit A <b> 1 includes a first classification chamber 101 that classifies particulate matter contained in the inflowing exhaust gas, and a first classification chamber 101 that is formed inside the first classification chamber 101. And a collection chamber 102. In the first-stage classification unit A1, by adjusting the flow of exhaust gas between the first classification chamber 101 and the first collection chamber 102, particulate matter having a particle diameter of 10 μm or more is separated (classified), Collect.

  The first-stage classification part A1 is formed in the most upstream part of the cylindrical main body part 10. The first-stage classification portion A1 includes a circular flat plate portion 11 serving as a partition from the outside, and a cylindrical mounting rib 12 that protrudes outward from the flat plate portion 11 and to which the inflow nozzle 63 is fixed. The attachment portion 631 of the inflow nozzle 63 has a male screw on the outer periphery, and the inflow nozzle 63 is attached to the main body portion 10 by screwing with a female screw provided on the inner peripheral surface of the attachment rib 12.

  The first-stage classification unit A1 includes a support columnar portion 13 that protrudes inward from the inner surface of the main body portion 10 and a chamber case 14 that is supported by the support columnar portion 13 so as not to contact the inner surface of the main body portion 10. ing. A space inside the chamber case 14 constitutes the first collection chamber 102.

  The first-stage classifying portion A1 includes a plurality (six here) of acceleration nozzles 15 (see FIG. 8A) provided so as to penetrate the flat plate portion 11 at the center of the flat plate portion 11, and the acceleration nozzle 15 And a collection nozzle 16 (see FIG. 8B) provided so as to penetrate the chamber case 14. The same number of collection nozzles 16 as the acceleration nozzles 15 are provided.

  As shown in FIG. 3, a first suction pipe portion 181 extending in the axial direction is formed inside the main body portion 10. The first suction pipe portion 181 is formed to extend from the third divided member 10c to the eighth divided member 10h. A first suction pipe 18 that connects the first suction pipe part 181 and the first collection chamber 102 inside the chamber case 14 is formed inside the support columnar part 13. Note that a first sub suction nozzle 41 to be described later is connected to the first suction pipe portion 181.

  Further, an airflow channel 17 that is a gap through which exhaust gas flows is formed between the inner surface of the main body 10 and the outer surface of the chamber case 14. Further, the chamber case 14 is provided with a filter portion 19 provided so that all airflows passing through the chamber case 14 pass through. Although details will be described later, an air flow is generated in the first collection chamber 102 by sucking the exhaust gas from the first collection chamber 102 through the first suction pipe 18.

  Therefore, the 1st suction pipe 18 is formed in the downstream of the flow direction of the airflow inside the 1st collection chamber 102, ie, the 3rd division member 10c (refer FIG. 8C). The filter unit 19 has an annular frame and has a configuration in which a filter medium Fi is detachably disposed on an upper part of a filter holder in which a net-like fired filter 191 is sandwiched and fixed. The firing filter 191 is for holding the filter medium Fi by suppressing the filter medium Fi from being deformed or damaged by the force of the airflow flowing through the filter unit 19. Therefore, it is preferable that the firing filter 191 can hold the filter medium Fi and has a mesh with a small pressure loss.

  As the filter medium Fi, a thermally stable property (for example, deformation and alteration at high temperature is unlikely to occur) in case the inflowing exhaust gas is at a high temperature is employed. Further, a filter medium that does not adsorb substances (including particulate substances) contained in the inflowing exhaust gas and does not cause a chemical reaction with the substances is employed. Examples of the filter medium Fi include, but are not limited to, a quartz fiber filter (QR-100: manufactured by Advantech Toyo Co., Ltd.) and the like. The collection efficiency of this quartz fiber filter (QR-100) conforms to JIS Z 8901. When the air in which 0.3 μm dioctyl phthalate particles are dispersed is filtered at a ventilation rate of 5 cm / s, it is 99.99. 99 percent can be collected. That is, the filter medium Fi can collect particles of 0.3 μm or more.

  Moreover, in order to suppress that the airflow which flows through the inside leaks outside, each division member of the main-body part 10 is maintaining airtightness by packing Pk1 provided in the division | segmentation boundary of the division member of the main-body part 10. FIG. In addition, each division member except the 1st division member 10a is provided with the annular recessed part for fitting packing Pk1 in the edge part of an upstream. By attaching the packing Pk1 to the recess and assembling the divided members in the axial direction, the internal space of the main body 10 can be formed airtight.

  In addition, packing Pk2 for maintaining airtightness is also provided around the first suction pipe portion 181.

  In the first stage diverter A1, exhaust gas containing particulate matter flows in through the acceleration nozzle 15. A part of the exhaust gas flowing out from the acceleration nozzle 15 flows into the collection nozzle 16. The rest flows laterally from between the accelerating nozzle 15 and the collection nozzle 16, passes through the air flow channel 17, and flows into the second stage branching portion A <b> 2. Although details will be described later, in the first-stage branching section A1, among the particulate substances contained in the exhaust gas flowing from the acceleration nozzle 15, particulate substances having a particle diameter of 10 μm or more flow into the collection nozzle 16. Particulate matter flowing from the collection nozzle 16 is collected by the filter unit 19. Further, the particulate matter having a particle diameter of less than 10 μm flows into the second-stage branching portion A2 through the airflow channel 17.

  The second stage classification unit A2 includes an inflow chamber 201, a second classification chamber 202, and a second collection chamber 203. The inflow chamber 201 faces the downstream side surface of the chamber case 14 and is connected to the first classification chamber 101 via the airflow channel 17. That is, the exhaust gas from which the particulate matter having a particle diameter of 10 μm or more has been removed flows into the second-stage classification unit A2 via the airflow channel 17.

  The second-stage branching portion A2 does not come into contact with the partition wall portion 21 that separates the inflow chamber 201 and the second classification chamber 202, the support columnar portion 22 that protrudes inward from the inner surface of the main body portion 10, and the inner surface of the main body portion 10. And a chamber case 23 supported by the support column portion 22. The second-stage classifying portion A2 includes a plurality of (six here) acceleration nozzles 24 (see FIG. 9A) provided so as to penetrate the partition wall portion 21 at the center of the partition wall portion 21, and the acceleration nozzle 24. And a collection nozzle 25 provided so as to penetrate the chamber case 23 (see FIG. 9B). The same number of collection nozzles 25 as the acceleration nozzles 24 are provided. In addition, an air flow channel 26 is formed between the inner surface of the main body 10 and the outer surface of the chamber case 23 for the flow of air.

  As shown in FIG. 4, a second suction tube portion 271 extending in the axial direction is formed at a portion on the opposite side of the center of the first suction tube portion 181 inside the main body portion 10. The second suction pipe portion 271 is formed in the sixth divided member 10f, the seventh divided member 10g, and the eighth divided member 10h of the main body portion 10. A second suction pipe 27 is formed between the second collection chamber 203 and the second suction pipe part 271 inside the support columnar part 22 (see FIG. 9C). The second suction pipe portion 271 is connected to a second sub suction nozzle 42 described later.

  A filter unit 28 is provided inside the second collection chamber 203. The structure of the filter unit 28 is the same as that of the filter unit 19 and has a configuration in which the filter medium Fi is arranged on the upper part of the filter holder. The firing filter, the filter holder, and the filter medium have the same configuration as the filter unit 19. Particulate matter having a particle size of 2.5 μm or more and less than 10 μm flows into the second collection chamber 203, and the inflowed particulate matter is collected by the filter medium Fi of the filter unit 28. In the second-stage classification unit A2, the particulate matter having a particle diameter of 2.5 μm or more and less than 10 μm is classified / collected from the particulate matter contained in the exhaust gas that has flowed. Then, the exhaust gas from which these particulate substances have been removed flows into the collection part A3 via the airflow channel 26.

  A third collection chamber 301 is formed in the collection unit A3. The collection part A3 includes a flow path part 31 formed from upstream to downstream, and the flow path part 31 forms a third collection chamber 301. And the flow path part 31 is provided with the filter part 32 distribute | arranged so that all the airflows which flow through the flow path part 31 may pass. Further, the downstream end portion of the third collection chamber 301 communicates with the main suction pipe portion 33 connected to the main suction nozzle 40.

  The filter unit 32 has the same configuration as that of the filter unit 19 and has a configuration in which a filter medium is disposed on the upper part of the filter holder. The firing filter, the filter holder, and the filter medium have the same configuration as the filter unit 19. Exhaust gas containing particulate matter having a particle diameter of less than 2.5 μm flows into the collection part A3, and the inflowed particulate matter is collected by the filter medium Fi of the filter part 32. As described above, the filter medium Fi can collect particles of 0.3 μm or less, and the filter medium Fi of the filter unit 32 collects almost all of the particulate matter having a particle diameter of less than 2.5 μm.

  As shown in FIGS. 10B and 10C, the eighth divided member 10h arranged on the most downstream side of the main body 10 has a main suction nozzle 40, a first sub suction nozzle 41, and an end face in the radial direction. The second sub suction nozzles 42 are arranged side by side on a straight line. The main suction nozzle 40, the first sub suction nozzle 41 and the second sub suction nozzle 42 are arranged so as to extend in a direction along the central axis of the main body 10. More specifically, the main suction nozzle 40 is formed at the center portion of the end face of the eighth divided member 10h, and the first sub suction nozzle 41 and the second sub suction nozzle 42 are arranged with the main suction nozzle 40 interposed therebetween. .

  A main suction tube 50 is attached to the main suction nozzle 40. A first sub suction tube 51 is attached to the first sub suction nozzle 41. Further, a second sub suction tube 52 is attached to the second sub suction nozzle 42. And in order to improve the airtightness of each attachment part of the main suction nozzle 40 and the main suction tube 50, the 1st sub suction nozzle 41 and the 1st sub suction tube 51, the 2nd sub suction nozzle 42, and the 2nd sub suction tube 52. A fixing member 53 is attached.

  The fixing member 53 is a disk-shaped member, and includes a main through hole 530 through which the peripheral suction nozzle 40 and the main suction tube 50 pass in the center. A first through hole 531 is formed at a position corresponding to the first sub suction nozzle 41 and the first sub suction tube 51. Further, a second through hole 532 is formed at a position corresponding to the second sub suction nozzle 42 and the second sub suction tube 52. A screw hole 533 for screwing two screws Scc into the disk-shaped fixing member 53 is provided. The two screws Scc passing through the screw hole 533 are screwed into the female screw hole 54 formed on the end face of the eighth divided member 10h (see FIG. 5).

  The outer shape of the main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42 has a tapered shape such that the tip is narrowed. And the main through-hole 530, the 1st through-hole 531, and the 2nd through-hole 532 have an internal diameter between the taper-shaped maximum outer diameter and minimum outer diameter. Note that each of the through holes 530, 531 and 532 may be a cylindrical hole or a tapered hole. The tapered hole of the through hole has a shape that narrows in the opposite direction to the tapered shape of the through holes 530, 531, and 532.

  Then, the fixing member 53 moves in the axial direction by turning the screw Scc. Since the main suction nozzle 40 has a tapered shape and the inner diameter of the main through hole 530 has an inner diameter between the maximum outer diameter and the minimum outer diameter of the main suction nozzle 40, the fixing member 53 moves in the axial direction. By doing so, the outer peripheral surface of the main suction nozzle 40 and the inner peripheral portion of the main through-hole 530 approach each other. Accordingly, the main suction tube 50 is sandwiched between the inner peripheral portion of the main through hole 530 and the outer peripheral surface of the main suction nozzle 40, and the main suction tube 50 is attached to the main suction nozzle 40 in an airtight manner.

  Similarly, the first sub suction tube 51 is sandwiched between the inner peripheral portion of the first through hole 531 and the outer peripheral surface of the first sub suction nozzle 41 and is attached to the first sub suction nozzle 41 in an airtight manner. The second sub suction tube 52 is sandwiched between the inner peripheral portion of the second through hole 532 and the outer peripheral surface of the second sub suction nozzle 42, and the second sub suction tube 52 is attached to the second sub suction nozzle 42 in an airtight manner. .

  By adopting such a configuration, the main suction nozzle 40, which corresponds to the main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52, respectively, with a simple operation of tightening the two screws Scc, The first sub suction nozzle 41 and the second sub suction nozzle 42 can be attached so as not to come off. From this, it is possible to simplify the attachment / detachment work between the tubes 50, 51, 52 and the corresponding nozzles 40, 41, 42. In addition, by fixing with the fixing member 53, it is possible to ensure attachment as compared with a configuration in which the tube is simply inserted into the nozzle.

  As shown in FIGS. 4 and 5, a grip portion 70 is attached to the downstream end portion of the main body portion 10, whereby the main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42. Are disposed inside the gripping portion 70, and the main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52 attached to these suction nozzles are disposed inside the gripping portion 70. Below, the detail of the holding | grip part 70 is demonstrated.

  As shown in FIGS. 1, 4, and 5, the gripping portion 70 is a gripping pipe 71 gripped by an operator, and an eighth division that is fixed to the tip of the gripping pipe 71 and that is the downstream end of the main body 10. And an attachment portion 72 attached to the member 10h. The attachment portion 72 has a cylindrical shape, and is attached to the main body portion 10 (eighth divided member 10h) so as to surround the main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42.

  The main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52 attached to the main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42, respectively, And is piped inside the gripping pipe 71.

  As shown in FIG. 7, the gripping pipe 71 includes a first pipe 711 having a mounting portion 72 fixed to the tip, and a second pipe 712 that is screwed into the first pipe 711. Two types of male screws Ma and Mb having different effective diameters are formed on the outer peripheral surface of the second pipe 712, and the first pipe 711 includes a female screw that is screwed with the male screw Ma. A nut member 713 is screwed into the male screw Mb. The nut member 713 is disposed such that the side surface in the axial direction can come into contact with the end surface of the first pipe 711.

  The male thread Ma of the first pipe 711 and the female thread of the second pipe 712 are screwed together to connect the first pipe 711 and the second pipe 712. Then, the nut member 713 is rotated, and the end surface of the nut member 713 is brought into contact (crimped) with the tip of the first pipe 711. As a result, the screwing of the first pipe 711 and the second pipe 712 and the screwing of the second pipe 712 and the nut member 713 are combined to form the same structure as a so-called double nut. This prevents loosening with the pipe 712.

  Next, attachment of the main body 10 and the grip 70 will be described. First, assembly of the main body 10 will be described. As shown in FIG. 5, the divided members 10b to 10h excluding the first divided member 10a are provided with positioning pins Pn on the upstream surface. And the positioning hole HL which the positioning pin Pn of the division member adjacent to a downstream engages is provided in the downstream surface of the division members 10a-10g except the 8th division member 10h. By inserting the positioning pin Pn into the positioning hole HL, the adjacent divided members can be positioned such that the central axes overlap and can be overlapped in the axial direction. In the present embodiment, the positioning pins are integrally formed, but may be separable.

  Further, in the virtual impactor VI, as shown in FIGS. 8A to 8D, FIGS. 9A to C, and FIGS. 10A to 10C, the positioning pins Pn provided in all the divided members 10a to 10h are provided at the same position in plan view. However, it is not limited to this. By setting the positions of all the divided members 10a to 10h in a plan view to be different positions, the positioning pins Pn cannot be inserted into the positioning holes HL unless the correct divided members are adjacent to each other, so that the wrong divided member is assembled. Can be suppressed.

  Moreover, as shown to FIG. 8A-D, FIG. 9A-C, and FIG. 10A-C, each division member 10a-10h is provided with a pair of 1st through-hole Sh11 and Sh11 penetrated to an axial direction. 1st through-hole Sh11, Sh11 is provided in the position which opposes on both sides of the center of each division member 10a-10h, and when each division member 10a-10h is piled up and arranged in an axial direction, the position which overlaps in an axial direction Is formed.

  Further, the split members 10a to 10g excluding the most downstream split member 10h have a pair of second through holes Sh22 and Sh22 provided on a line passing through the center and orthogonal to the line connecting the first through holes Sh11 and Sh11. Is provided. These second through holes Sh22 are also provided at positions where the divided members 10a to 10g overlap. Further, female screw holes Sh33 and Sh33 each having an internal thread formed on the inner peripheral surface are formed at positions overlapping the second through holes Sh22 and Sh22 of the split member 10h on the most downstream side of the main body portion 10.

  Then, the positioning pins Pn of the divided members 10b to 10h are inserted into the positioning holes HL provided on the downstream surfaces of the divided members 10a to 10g, respectively. At this time, the second through holes Sh22 and Sh22 of the divided members 10a to 10g and the female screw holes Sh33 and Sh33 of the eighth divided member 10h overlap in the axial direction. Then, the main body 10 is assembled by inserting the screw Sc2 into the through holes Sh22 and Sh22 from the first divided member 10a side and screwing the tip of the screw Sc2 into the female screw holes Sh33 and Sh33.

  Furthermore, the screw Sc1 is inserted from the first divided member 10a side of the through holes Sh11 and Sh11, and the tips thereof are screwed into the female screw holes 721 and 721 provided in the mounting portion 72 of the gripping portion 7 (in FIG. 5). Only one female screw hole 721 is shown). Thereby, the main-body part 10 and the holding part 70 are connected. As described above, the main body 10 can be assembled with the screw Sc1 and the screw Sc2 through the split members 10a to 10h and screwed into the female screw hole 721 and the female screw hole Sh33, respectively. The main body 10 and the grip 70 can be connected. As described above, since the virtual impactor VI according to the present invention can be assembled / disassembled with the screws Sc1 and Sc2, disassembly / assembly is easy.

  In the virtual impactor VI, the main body portion 10 includes a first suction pipe portion 181 for sucking exhaust gas from the first collection chamber 102 and a second suction pipe portion 271 for sucking exhaust gas from the second collection chamber 203. Is formed inside. The main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42 are provided inside the attachment portion 72 of the grip portion 70. A main suction tube 50, a first sub suction tube 51, and a second sub suction tube 52 attached to the main suction nozzle 40, the first sub suction nozzle 41, and the second sub suction nozzle 42, respectively. Has been placed. For these reasons, the virtual impactor VI according to the present invention has a shape in which protrusions such as piping are not formed in the outer peripheral direction of the main body 10.

  Next, the internal operation of the virtual impactor VI will be described. The main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52 are connected to a suction device (not shown) provided outside the virtual impactor VI.

  A main suction tube 50 is connected to the main suction nozzle 40 and is connected to the flow path portion 31. And the exhaust apparatus in which the main suction tube 50 is connected act | operates, and the exhaust gas in the flow-path part 31 is attracted | sucked. As a result, the pressure in the second classification chamber 202 connected to the flow path portion 31 via the airflow flow path 26 decreases, and the flow of exhaust gas from the inflow chamber 201 to the second classification chamber 202 ( Airflow) occurs. The inflow chamber 201 is connected to the first classifying chamber 101 via the air flow channel 17, and the acceleration nozzle 24 also enters the first classifying chamber 101 from the space surrounded by the internal space 630 of the inflow nozzle 63 and the flat plate portion 11. Exhaust gas flow (air flow) is generated.

  The first suction tube 51 is connected to the first sub suction nozzle 41, and the first suction tube portion 181 is connected. Further, the first suction pipe portion 181 is connected to the first collection chamber 102 via the first suction pipe 18. And the exhaust apparatus in which the 1st auxiliary | assistant suction tube 51 is connected act | operates, and the exhaust gas in the 1st collection chamber 102 is attracted | sucked. As a result, the pressure in the first collection chamber 102 decreases, and an air flow from the first classification chamber 101 to the first collection chamber 102 is generated in the collection nozzle 16.

  The second suction tube 52 is connected to the second sub suction nozzle 42, and the second suction tube portion 271 is connected. Further, the second suction pipe portion 271 is connected to the second collection chamber 203 via the second suction pipe 27. And the exhaust apparatus in which the 2nd sub suction tube 52 is connected act | operates, and the exhaust gas in the 2nd collection chamber 203 is attracted | sucked. As a result, the pressure in the second collection chamber 203 is reduced, and an air flow from the second classification chamber 202 to the second collection chamber 203 is generated in the collection nozzle 25.

  Assuming that the flow rate of the exhaust gas flowing from the internal space of the inflow nozzle 63 into the first-stage branching portion A1 through the accelerating nozzle 15 is the flow rate Q0, the flow rate Q0 is the flow rate Q1 flowing toward the airflow channel 17 and 16 is divided into a flow rate Q2 flowing into the first collection chamber 102. Since the exhaust gas in the first collection chamber 102 is sucked by the first sub suction tube 51, the flow rate of the exhaust gas sucked through the first sub suction tube 51 is the flow rate Q2. That is, the relationship of Q0 = Q1 + Q2 is established among the flow rate Q0, the flow rate Q1, and the flow rate Q2.

  Further, the flow rate of the exhaust gas that has flowed into the second-stage branching portion A2 via the airflow channel 17 is Q1. The exhaust gas that has flowed into the second-stage branching portion A2 passes through the acceleration nozzle 24, and flows to the airflow channel 26 side. The flow rate Q3 flows to the second collection chamber 203 via the collection nozzle 25. Divided into Since the exhaust gas in the second collection chamber 203 is sucked by the second sub suction tube 52, the flow rate of the exhaust gas sucked through the first sub suction tube 52 is the flow rate Q4. That is, the relationship of Q1 = Q3 + Q4 is established among the flow rate Q1, the flow rate Q3, and the flow rate Q4.

  Further, the flow rate of the exhaust gas flowing into the collection part A3 via the air flow channel 26 is a flow rate Q3, and this exhaust gas is all sucked through the main suction tube 50. Therefore, the flow rate of the exhaust gas sucked through the main suction tube 50 is the flow rate Q3.

  In summary, the flow rate Q0 of the exhaust gas flowing in from the inflow nozzle 63, the flow rate Q3 of the exhaust gas sucked through the main suction tube 50, and the exhaust gas sucked through the first sub suction tube 52 A relationship of Q0 = Q2 + Q3 + Q4 is established between the flow rate Q2 and the flow rate Q4 of the exhaust gas sucked through the second auxiliary suction tube 52.

  From the above, the flow rate Q0 of the exhaust gas flowing through the inflow nozzle 63 (that is, the flow rate of the exhaust gas taken in at the intake port 61) is set in the main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52. It becomes the same as the flow rate of the exhaust gas sucked through. That is, the virtual impactor VI according to the present invention takes in the exhaust gas from the intake port 61 by sucking the exhaust gas through the main suction tube 50, the first sub suction tube 51, and the second sub suction tube 52. .

  In the first-stage classification unit A1 and the second-stage classification unit A2 of the virtual impactor VI, the shape of the acceleration nozzle 15 (24) and the collection nozzle 16 (25) and the exhaust gas flowing out from the acceleration nozzle 15 (24) The particle size of the particulate matter to be classified is determined by the flow rate. This classification method will be described with reference to the drawings. FIG. 11 is a diagram illustrating a classification state in the first-stage classification unit.

  The first-stage classification part A1 and the second-stage classification part A2 have substantially the same configuration although the detailed values of the shapes are different because the particle diameters to be classified are different. Therefore, on behalf of both, description will be made with reference to the first-stage classification unit A1. In addition, although only one acceleration nozzle 15 and one collection nozzle 16 are illustrated, six virtual impactors VI are provided. In the following description, when the exhaust gas flow rates Q0, Q1, and Q2 are described, only one acceleration nozzle 15 and collection nozzle 16 are illustrated on the drawing. This is the total flow rate of the exhaust gas flowing through the acceleration nozzle 15 and the collection nozzle 16.

  As shown in FIG. 11, the acceleration nozzle 15 and the collection nozzle 16 are arranged so that the centers thereof overlap in the flow direction of the exhaust gas. The accelerating nozzle 15 has a configuration in which the inner diameter becomes narrower toward the downstream in the flow direction of the exhaust gas, and the flow velocity is increased. The flow rate of the exhaust gas flowing from the acceleration nozzle 15 is a flow rate Q0.

  In the first-stage classification unit A1, a part of the exhaust gas flowing in from the acceleration nozzle 15 flows into the first collection chamber 102 through the collection nozzle 16, and the rest through the airflow channel 17 to the second stage. It flows into classification part A2. As shown in FIG. 5 and the like, the air flow channel 17 communicates with the gap between the acceleration nozzle 15 and the collection nozzle 16. Therefore, the exhaust gas flowing through the airflow channel 17 flows toward the side from the gap between the acceleration nozzle 15 and the collection nozzle 16 at a flow rate Q1. Further, part of the exhaust gas flowing out from the acceleration nozzle 15 flows through the collection nozzle 16 at a flow rate Q2.

  The exhaust gas flowing through the accelerating nozzle 15 is accelerated, and the particulate matter contained in the exhaust gas is accelerated along the flow of the exhaust gas. Of the particulate matter contained in the exhaust gas flowing out from the acceleration nozzle 15, the particulate matter having a small particle diameter has a small weight and a small inertial force. Therefore, the particulate matter having a small particle diameter that has flowed out of the acceleration nozzle 15 flows sideways on the flow of the exhaust gas toward the airflow channel 17.

  On the other hand, those having a large particle size are heavy and have a large inertial force. Therefore, the particulate matter having a large particle diameter flowing out from the acceleration nozzle 15 is directed to the collection nozzle 16 by inertial force. And it flows in into the 1st collection chamber 102 via the collection nozzle 16 by the flow (flow rate Q2) of the exhaust gas which flows through the collection nozzle 16.

  Thus, in the virtual impactor VI, the particulate matter is classified according to the particle diameter by utilizing the difference between the force of the exhaust gas flowing and the inertial force of the particulate matter. In the virtual impactor VI, the amount of exhaust gas flowing to the collection nozzle is set small relative to the flow rate of the exhaust gas flowing to the side, and only the particulate matter having a large inertial force (large particle diameter) is collected. It is allowed to flow into.

  In the virtual impactor VI, since the particulate matter flows into the collection nozzle 16 by inertia force, the flow rate Q2 of the exhaust gas flowing through the collection nozzle 16 becomes the flow rate Q1 of the exhaust gas flowing through the air flow channel 17. It can be small. In the virtual impactor VI according to the present invention, the flow rates Q1 and Q2 are set to Q2 / Q1≈1 / 9, but the present invention is not limited to this.

  In the first-stage classification section A1, the shape (inner diameter, length, etc.) of the acceleration nozzle 15 and the flow rate of the exhaust gas passing through, the shape (inner diameter, etc.) of the collection nozzle 16, and the tip of the acceleration nozzle 15 and the collection nozzle 16 By adjusting the distance from the tip or the like, the particle diameter of the particulate matter flowing into the collection nozzle 16 can be adjusted. Classification is performed in the same manner in the second-stage classification unit A2. The size of each nozzle is set so that the particulate matter having a particle size of 10 μm or more flows into the collection nozzle 16 in the first stage classification unit A1, and the particle size in the second stage classification unit A2. It is set so that particulate matter of 2.5 μm or more flows into the collection nozzle 25.

  As shown in FIG. 11, in the virtual impactor V <b> 1, a chamfered portion 161 having a curved shape is formed on the inner peripheral portion of the upstream end portion (suction portion) of the collection nozzle 16. By providing the curved chamfered portion 161, the exhaust gas flowing out from the acceleration nozzle 15 (streamline shown in FIG. 11) is less likely to flow into the collection nozzle 16. That is, it is possible to suppress the particulate matter having a small particle diameter from flowing into the collection nozzle 16 and improve the classification accuracy.

  Inside the virtual impactor VI, exhaust gas containing particulate matter flows. And in order to suppress adhesion and turbulent flow of particulate matter, it is preferable that the surface roughness of the surface in contact with the exhaust gas flowing into the virtual impactor VI is small. Therefore, the surface which makes surface roughness small may be given to the surface which contacts exhaust gas.

  The virtual impactor VI according to the present invention has a flat surface portion 100 in which the outer surface of the main body portion 10 is partially cut. By having the flat surface portion 100, even if the main body portion 10 is laid sideways on a horizontal surface, rolling is suppressed. In addition, by making the bending direction of the intake pipe 62 with respect to the flat surface portion 100 constant at all times or by remembering by the operator, the direction of the intake port 61 of the inflow portion 60 disposed inside the flue Ep is accurately smoked. The exhaust gas flow of the road Ep can be directed upstream. Moreover, it contributes also to weight reduction by having a notch shape.

  In addition, since the virtual impactor VI according to the present invention can sample the exhaust gas in the flue Ep only by inserting at least the inflow portion 60 (among the intake port 61) into the flue Ep, the flue Ep. Should have at least an inner diameter into which the intake 61 can be inserted. Therefore, it is possible to sample the exhaust gas flowing through the various flues Ep with one virtual impactor VI or a virtual impactor VI of the same design. Thereby, it is not necessary to design the virtual impactor VI in accordance with the flue Ep, and to perform manufacture according to the design, and it is possible to efficiently sample the exhaust gas.

  Furthermore, in the virtual impactor VI according to the present invention, there is no protrusion on the outer peripheral portion of the main body, and there is no tube or the like connected to the outer peripheral portion. Therefore, the virtual impactor VI can be easily inserted and removed from the narrow working hole Ins. In addition, when mounting or assembling work, the projection of the virtual impactor VI is brought into contact with an external member so that the projection does not break or the suction tube comes off. Therefore, it is possible to increase the efficiency of work. Further, during sampling, the main body 10 that is a heavy object can be supported by being brought into contact with the work hole Ins, so that the burden on the worker who supports the virtual impactor VI can be reduced.

  The gripping portion 70 is for operating with the virtual impactor VI and has a sufficient strength. In the virtual impactor VI of the present invention, the suction pipe is formed inside the main body part 10 and the tube is arranged inside the gripping part 70. It can suppress that a tube is crushed. Thus, by using the virtual impactor VI according to the present invention, the exhaust gas inside the flue Ep can be sampled stably and reliably even if the virtual impactor VI is attached to a place where an external force is likely to act. Is possible.

  In the measurement of PM10 / PM2.5 using the virtual impactor VI, the exhaust gas is sampled for a certain period (time), and then the virtual impactor VI is disassembled to determine the weights of the filter unit 19, the filter unit 28, and the filter unit 32. measure. Particulate matter having a particle size of 10 μm or more is attached to the filter portion 19, and particulate matter having a particle size of less than 10 μm and 2.5 μm or more is attached to the filter portion 28. And since the particulate matter with a particle diameter of less than 2.5 μm is adhered to the filter part 32, it is included in the exhaust gas by comparing the weight changes of the filter media of these filter parts 19, 28, 32. PM10 (particulate matter having a particle size of 2.5 μm or more and less than 10 μm) and PM2.5 (particulate matter having a particle size of less than 2.5 μm) can be measured.

  Thus, the virtual impactor VI repeats disassembly / assembly to disassemble at the end of sampling. Since the virtual impactor VI according to the present invention uses the screws Sc1 and Sc2 for fixing the divided members 10a to 10h and the grip portion 70, the disassembly / assembly can be easily and repeatedly performed.

(Second Embodiment)
Another example of the inflow nozzle used in the virtual impactor will be described with reference to the drawings. FIG. 12 is a sectional view of the inflow nozzle used in the virtual impactor according to the present invention. The configuration other than the inflow nozzle is the same as that shown in the first embodiment.

  In the virtual impactor VI, the exhaust gas containing the particulate matter taken in from the intake port 61 passes through the intake pipe 62 and the flow direction is changed, and then flows into the inflow nozzle 63. And the flat plate part 11 of the 1st division | segmentation part 10a faces the edge part by the side of the discharge | emission of the inflow nozzle 63. FIG. As shown in FIGS. 4, 5 and the like, the flat plate portion 11 is configured such that the exhaust gas flowing through the inflow nozzle 63 blows at a right angle or an angle close thereto.

  In such a configuration, the particulate matter tends to adhere to the surface of the flat plate portion 11 depending on the type of the particulate matter contained in the exhaust gas. In addition, if particulate matter adheres, the particulate matter further adheres on the attached particulate matter, and the particulate matter is likely to accumulate, and the concentration of particulate matter contained in the exhaust gas is reduced. It may become impossible to grasp accurately.

  Therefore, in place of the inflow nozzle 63 shown in FIG. 6, an inflow nozzle 65 as shown in FIG. An internal space 650 of the inflow nozzle 65 shown in FIG. 12 includes a chamber portion 653 for storing exhaust gas therein. By providing the chamber portion 653, the flow rate of the exhaust gas flowing into the inflow nozzle 65 is reduced. And since exhaust gas forms a layer, it can suppress that the exhaust gas which flows in directly sprays on the flat plate part 11, and suppresses that a particulate matter adheres to the flat plate part 11. It is possible. Note that the size of the chamber portion 653 is determined by the flow rate of the exhaust gas and the type of particulate matter contained in the exhaust gas.

  Other features are the same as in the first embodiment.

(Third embodiment)
FIG. 13 is a cross-sectional view showing a state in which the virtual impactor is attached to the curved portion of the flue, and FIG. 14 is a cross-sectional view of another example of the inflow nozzle.

  In the first embodiment, the virtual impactor VI is inserted in a direction intersecting with the flow of the exhaust gas in the flue Ep (perpendicular in FIG. 2). Depending on the configuration of the flue Ep, as shown in FIG. 13, a work hole Ins may be formed in a curved portion Eb like an elbow of a pipe. When the virtual impactor VI is arranged in such a curved portion and the exhaust gas is sampled, if the intake pipe 62 bent as in the first embodiment is used, the end of the intake port 61 is located upstream of the exhaust gas flow direction. May not be able to be directed to the side, making accurate sampling difficult.

  Therefore, as shown in FIG. 14, an inflow nozzle 66 having a cylindrical inflow portion 662 extending along the central axis on the upstream side is attached to the main body portion 10. By providing such an inflow portion 662, even when the flow in the flue Ep flows along the axial direction of the virtual impactor VI, the exhaust gas can be accurately sampled.

  In the present embodiment, the example using the inflow nozzle 66 provided with the inflow portion 662 having a cylindrical tip is described, but the present invention is not limited to this. The inflow portion 662 may be formed at an angle with respect to the axis.

  Further, in the inflow nozzle in which the intake pipe 62 can be attached and detached as shown in FIG. 6 or FIG. 12, the intake pipe 62 may be replaced to correspond to the shape of the flue Ep. For example, in addition to the 90-degree bent intake pipe 62 shown in FIG. 6, a plurality of intake pipes that are not bent (straight) and have a bent angle other than 90 degrees are prepared, and the angle between the flue Ep and the virtual impactor VI is set. In addition, a shape capable of effectively sampling the exhaust gas may be selected. By comprising in this way, the fall of the sampling accuracy of exhaust gas can be suppressed.

  In addition to the bending angle, an intake pipe 62 having a different inner diameter is prepared, and the intake pipe is adapted to the shape and size of the flue Ep, the shape of the working hole Ins, and the state of the exhaust gas (flow velocity, component, etc.). The exhaust gas may be sampled by replacing 62. For example, when the flow rate of exhaust gas is fast, the inner diameter is reduced, and when it is slow, the inner diameter is increased. By changing the inner diameter of the intake pipe 62 in this way, the flow rate of the exhaust gas flowing into the virtual impactor VI can be made constant even if the flow rate of the exhaust gas changes, and more accurate evaluation (comparison) Is possible.

  As described above, the exhaust gas can be sampled with high accuracy even if the place where the work hole Ins is formed is different simply by replacing the inflow nozzle itself or the intake pipe. Therefore, it is not necessary to change the main body 10 of the virtual impactor VI, and it can be easily handled regardless of the position of the working hole Ins with respect to the flue Ep.

  Other features are the same as those in the first to second embodiments.

(Fourth embodiment)
Another example of the virtual impactor according to the present invention will be described with reference to the drawings. FIG. 15 is an enlarged cross-sectional view of another example of a virtual impactor which is a classification device according to the present invention. A virtual impactor V2 shown in FIG. 15 has the same configuration as the virtual inverter VI shown in the first embodiment, except that it includes an inlay structure Ir for connecting the divided members. Therefore, substantially the same parts are denoted by the same reference numerals, and detailed description of the same parts is omitted. Note that the main body 10 of the virtual impactor V2 shown in FIG. 15 is enlarged from the first divided member 10a to the fourth divided member 10d.

  When a force is applied to the virtual impactor VI shown in the first embodiment or the like in a direction intersecting the axis, a shearing force that shifts an adjacent divided member in the direction intersecting the axis may be generated in the divided member. At this time, since the adjacent divided members are positioned by the positioning pins Pn and the screws Sc1 and Sc2 pass through the divided members, the shearing force acts on the positioning pins Pn and the screws Sc1 and Sc2.

  When the main body part 10 is dropped or brought into contact with a rigid body such as a wall at the time of attachment and a large force acts on the main body part 10, a large shearing force is applied to the positioning pin Pn and the screws Sc1 and Sc2. However, the shearing force may cause deformation or damage.

  The virtual impactor V2 is provided with a cylindrical inlay structure Ir, and by combining the inlay structure Ir, adjacent split members (in FIG. 15, the first split member 10a, the second split member 10b, the second split member 10b, The three divided members 10c, the third divided member 10c and the fourth divided member 10d) are connected.

  The inlay structure Ir includes a protruding portion Ir1 having an axially extending inner peripheral surface portion of the upstream surface of the divided members 10b to 10h excluding the first divided member 10a, and the divided members 10a to 10h excluding the eighth divided member 10h. It has a recessed hole-shaped insertion portion Ir2 formed on the downstream surface of 10g and into which the protruding portion Ir1 of the dividing member adjacent to the downstream side is inserted.

  As shown in FIG. 15, since the spigot structure Ir has a shape in which the inner peripheral surface portion of each divided member is extended, the size of the surface that receives the shearing force is increased. That is, since the shearing force is dispersed, deformation and breakage are less likely to occur. Although not shown in FIG. 15, the fifth divided member 10e to the eighth divided member 10h are also connected with the same inlay structure Ir.

  Moreover, since the shape of the part which a division member adjoins becomes complicated by forming the inlay structure Ir, there also exists an effect which raises the suppression of the leakage of the exhaust gas which flows through an inside. In the present embodiment, the inlay structure Ir is described as having a cylindrical shape, but a structure having a cross section other than a circle such as an ellipse or a polygon may be used. Thus, when it has a cross section other than a circle, for example, even when a torsional force is applied to the main body 10, the inlay structure Ir receives a torsional force, so that the split member is twisted (rotates) with respect to the adjacent split member. ) Can be suppressed.

  Other features are the same as those of the first to third embodiments.

  In each above-mentioned embodiment, although the outer peripheral surface of the main-body part 10 is set as the structure which combined the cylindrical shape which cut off one place, and a plane, a notch part is not limited to one place. The shape may not be cut out (it may be cylindrical), or may be a cylindrical shape cut out at a plurality of locations. Moreover, it may have a cross section that is not a perfect circle such as an ellipse, or may have a cross section that is a polygon such as a quadrangle or a hexagon.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 10 Main-body part 10a-10h Dividing member 11 Flat plate part 12 Mounting rib 13 Supporting columnar part 14 Chamber case 15 Acceleration nozzle 16 Collection nozzle 161 Chamfering part 17 Air flow path 18 1st suction pipe 181 1st suction pipe part 19 Filter part 101 1st classification chamber 102 1st collection chamber 201 Inflow chamber 202 2nd classification chamber 203 2nd collection chamber 21 Partition part 22 Supporting columnar part 23 Chamber case 24 Acceleration nozzle 25 Collection nozzle 26 Airflow flow path 27 2nd suction pipe 271 Second suction pipe section 28 Filter section 31 Flow path section 32 Filter section 33 Main suction pipe section 40 Main suction nozzle 41 First sub suction nozzle 42 Second sub suction nozzle 50 Main suction tube 51 First sub suction tube 52 Second Sub suction tube 60 Inflow portion 61 Intake port 62 Intake pipe 63 Inflow nozzle 64 Constant nut 65 inflow nozzles 66 inflow nozzles 70 the gripper 71 grip the pipe 72 gripping portion Ep flue Ins operation hole Pkn packing Pk1, Pk2 packing

Claims (10)

A classification device that inserts into a tube and classifies powder of a predetermined range contained in a fluid flowing through the tube,
A cylindrical main body,
An inflow nozzle that is provided on an end surface in the axial direction of the main body and allows the fluid to flow;
A main suction nozzle that sucks fluid flowing into the main body and projects axially from the other axial end surface of the main body;
A classification unit for classifying the powder contained in the fluid in one or more stages disposed inside the main body;
A collection filter disposed downstream of the classification unit;
An acceleration nozzle for accelerating the fluid flowing through the classification unit;
A collection nozzle that is disposed opposite to the acceleration nozzle and sucks a part of the fluid flowing out of the acceleration nozzle;
A classification device comprising: a sub-suction nozzle connected to the collection nozzle and protruding in the axial direction from the same end surface as the main suction nozzle. A main suction tube and a sub suction tube are attached to each of the main suction nozzle and the sub suction nozzle,
An attachment member having a through hole formed at a position corresponding to the main suction nozzle and the sub suction nozzle;
The main suction tube and the sub suction tube inserted into the through-hole are connected to the main suction nozzle and the sub suction nozzle, respectively, and the attachment member is brought close to the main body portion so that the main suction tube and the sub suction tube are clamped. The classifier described. The main body has a configuration that can be divided into a plurality of divided members in the axial direction;
The split member has a fitting portion that fits with the adjacent split member and an inlay structure centered on the central axis of the main body portion, and a positioning pin that protrudes in one axial direction is provided on the other axial end surface The classification device according to claim 1 or 2, wherein the classification device is fitted into the provided recess. A classification device that inserts into a tube and classifies powder of a predetermined range contained in a fluid flowing through the tube,
A cylindrical main body,
An inflow nozzle that is provided on an end surface in the axial direction of the main body and allows the fluid to flow;
A main suction nozzle for sucking fluid flowing into the main body,
A classification unit for classifying the powder contained in the fluid in one or more stages disposed inside the main body;
A collection filter disposed downstream of the classification unit;
An acceleration nozzle for accelerating the fluid flowing through the classification unit;
A collection nozzle that is disposed opposite to the acceleration nozzle and sucks a part of the fluid flowing out of the acceleration nozzle;
A sub-suction nozzle connected to the collection nozzle and sucking fluid from the collection nozzle;
The main body has a configuration that can be divided into a plurality of divided members in the axial direction;
The split member has a fitting portion that fits with the adjacent split member and an inlay structure centered on the central axis of the main body portion, and a positioning pin that protrudes in one axial direction is provided on the other axial end surface A classifier that fits into the provided recess.   The cylindrical gripping member which can be attached or detached so that the said main suction nozzle and the said sub suction nozzle may be located inside is provided in the downstream edge part of the said main-body part in any one of Claims 1-4. The classifier described. The gripping member has a structure that can be divided into a plurality of parts, and has a screw fitting portion that can screw each of the divided members,
The classification device according to claim 5, wherein the screw fitting portion includes a nut member for preventing loosening attached to a male screw formed on one member.   The classification device according to any one of claims 1 to 6, wherein the suction portion of the collection nozzle has a curved chamfer.   The classification device according to any one of claims 1 to 7, wherein the inflow nozzle is formed to be detachable from the main body.   The classification device according to any one of claims 1 to 8, wherein the inflow nozzle has a chamber portion for suppressing a flow rate therein.   The classification device according to any one of claims 1 to 9, wherein the main body includes an outer peripheral surface including a cylindrical surface and a plane obtained by cutting a part of the cylindrical surface.

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