JP7142263B2 - Separator - Google Patents

Description

FIELD OF THE DISCLOSURE The present disclosure relates generally to separation devices , and more particularly to separation devices for separating dust contained in a sample fluid.

Patent Literature 1 describes a dust detection device. The dust detection device described in Patent Literature 1 collects (that is, separates) dust contained in the sample air introduced from the introduction port with a collecting body arranged facing the introduction port.

JP 2016-212063 A

However, in the dust detection device described in Patent Document 1, when the dust is a relatively heavy object, when the dust is blown into the collector from the inlet, the weight of the dust causes the dust to move from the center to the inner circumference of the collector. The dust may deviate from the surface and roll on the inner peripheral surface of the collector under the weight of the dust and fall from the collector. As a result, the above-mentioned dust cannot be collected by the collector, and there is a problem that the separation accuracy for separating the dust from the sample air is lowered.

In view of the above points, an object of the present disclosure is to provide a separation device capable of improving separation accuracy for separating dust from a sample fluid.

A separation device according to one aspect of the present disclosure includes a housing and a cylinder. The housing has an introduction portion into which the sample fluid is introduced and an exit portion from which the sample fluid is discharged. The barrel has a first open end. The first open end is arranged inside the housing and faces the introduction port of the introduction section. A first passageway and a second passageway are formed. The first passage is a passage surrounded by the cylindrical body, and dust contained in the sample fluid flows from the open end. The second passage is a passage surrounded by the housing, which is different from the first passage, is arranged outside the cylindrical body, and includes the introduction port and the discharge port of the discharge section. and the sample fluid flows. The cylinder has a protrusion. The protrusion protrudes inward of the first passage. The tips of the protrusions face each other.

The present disclosure has the advantage of being able to improve the separation accuracy for separating dust from the sample fluid.

FIG. 1 is a schematic cross-sectional view of the dust detection system according to the embodiment. FIG. 2 is a cross-sectional view taken along line AA of FIG. 3A is a cross-sectional view for explaining the operation of the air blow mechanism of the dust detection system, taken along line BB of FIG. 1. FIG. FIG. 3B is a cross-sectional view taken along line CC of FIG. 3A. 4A is a cross-sectional view for explaining the operation of the same air blow mechanism, taken along line BB of FIG. 1. FIG. FIG. 4B is a cross-sectional view taken along line DD of FIG. 4A. 5A is a cross-sectional view for explaining the operation of the same air blow mechanism, taken along line BB of FIG. 1. FIG. FIG. 5B is a cross-sectional view along line EE of FIG. 5A. FIG. 6 is a schematic cross-sectional view of a dust detection system according to a modification. FIG. 7 is a schematic perspective view of a movable mechanism of a dust detection system according to another modification.

Details of the dust detection system provided with the separation device according to the present embodiment will be described below with reference to the drawings.

1, the left side of FIG. 1 is the left side of the dust detection system 1, the right side of FIG. 1 is the right side of the dust detection system 1, and the upper side of FIG. 1 is dust detection. The top side of the system 1 is defined as the bottom side of the dust detection system 1 . 1 is defined as the front side of the dust detection system 1, and the rear side of the dust detection system 1 is defined as the back side in the direction perpendicular to the paper surface of FIG. However, these directions are not meant to limit the directions in which the dust detection system 1 is used.

(embodiment)
The dust detection system 1 according to this embodiment includes a separation device 100 and a dust sensor 4, as shown in FIG. The separation device 100 is a device that separates dust 92 (see FIG. 3A) from sample air 91 (sample fluid). The dust sensor 4 is arranged in the separating device 100 and is a sensor that detects the dust 92 separated by the separating device 100 (that is, the dust that has passed through the first passage 33 described later).

The separation device 100 includes a housing 2 and a collector 3 (cylinder). The housing 2 has a first hose 26 (introduction section) into which the sample air 91 is introduced and a second hose 27 (exhaust section) into which the sample air 91 is discharged. The collector 3 has a first open end 31 (open end). The first open end 31 faces the inlet 28 of the first hose 26 through which the sample air 91 (sample fluid) is introduced. The separation device 100 is formed with a first passage 33 and a second passage S1. The first passage 33 is a passage surrounded by the collector 3 , and dust 92 (see FIG. 3A) contained in the sample air 91 flows from the first open end 31 . The second passage S1 is a passage different from the first passage 33, is arranged outside the collector 3, and connects the introduction port 28 and the discharge port 29 of the second hose 27 (discharge portion). , the sample air 91 flows. The collector 3 has a projecting portion 34 . The protrusion 34 protrudes inside the first passage 33 .

The separation device 100 further includes an air blow mechanism 5 , a flow velocity sensor 6 and an adhesive member 7 .

The housing 2 has a substantially columnar (for example, cylindrical) box shape and is made of metal, synthetic resin, or the like. The housing 2 may be made of synthetic resin having a light-shielding property. A central axis (chain line Q1 in FIG. 1) of the substantially columnar shape of the housing 2 is parallel to the vertical direction. That is, the housing 2 is arranged vertically.

The housing 2 includes a peripheral wall portion 21, a first wall portion 22, a second wall portion 23, a first hose 26 (introduction portion), a second hose 27 (discharge portion), and a throttle portion. 30 and .

The peripheral wall portion 21 has a tubular shape (for example, a cylindrical shape) penetrating vertically, and has an opening at one end (ie, upper end) and an opening at the other end (ie, lower end). Openings at both ends of the peripheral wall portion 21 are partially closed by the first wall portion 22 and the second wall portion 23 .

More specifically, the first wall portion 22 is provided at one end opening of the peripheral wall portion 21 so as to close the one end opening of the peripheral wall portion 21 . That is, the peripheral wall portion 21 is connected to the outer peripheral edge 22 b of the first wall portion 22 . The first wall portion 22 has an annular (for example, annular) plate shape and has a hole portion 22a in the center.

The first hose 26 has a cylindrical shape (for example, a cylindrical shape) and is provided to penetrate the hole 22 a of the first wall portion 22 . The first hose 26 is parallel to the central axis of the peripheral wall portion 21 . The central axis of the peripheral wall portion 21 is the central axis of the housing 2 (one-dot chain line Q1 in FIG. 1). The first hose 26 functions as an inlet 28 for introducing the sample air 91 into the housing 2 from the outside. That is, in this embodiment, the introduction port 28 is formed in a tubular shape by the first hose 26 . The central axis of the inlet 28 is parallel to the central axis of the peripheral wall portion 21 .

The second wall portion 23 is provided at the other end opening of the peripheral wall portion 21 of the housing 2 so as to close the other end opening portion of the peripheral wall portion 21 . That is, the outer peripheral edge 23 b of the second wall portion 23 is connected to the peripheral edge of the other end opening of the peripheral wall portion 21 . The second wall portion 23 has an annular (for example, annular) plate shape and has a hole portion 23a in the center.

The second hose 27 has a cylindrical shape (for example, a cylindrical shape) and is provided to pass through the hole portion 23 a of the second wall portion 23 . The second hose 27 is parallel to the central axis of the peripheral wall portion 21 . The second hose 27 functions as a discharge port 29 for discharging the sample air 91 from the inside of the housing 2 to the outside. That is, in this embodiment, the discharge port 29 is formed in a tubular shape by the second hose 27 . The central axis of the outlet 29 is parallel to the central axis of the peripheral wall portion 21 . The respective central axes of the housing 2, the first hose 26 and the second hose 27 are aligned on a substantially straight line (chain line Q1 in FIG. 1).

Thus, in this embodiment, the dust detection system 1 is arranged vertically. That is, an inlet 28 is provided in the first wall 22 on the upper side of the housing 2 , and an outlet 29 is provided in the second wall 23 on the lower side of the housing 2 . Then, the sample air 91 is introduced into the housing 2 from the upper side of the housing 2 through the inlet 28 and exhausted from the lower side of the housing 2 to the outside of the housing 2 through the outlet 29 .

Describing the shape of the first wall portion 22, the first wall portion 22 is formed, for example, in a cone shape. That is, the inner surface of the first wall portion 22 changes from the hole portion 22a side (that is, the inlet port 28 side) of the first wall portion 22 toward the outer peripheral edge 22b side in the direction of the central axis of the inlet port 28. , is inclined away from the central axis of the inlet 28 in a direction orthogonal to the central axis of the inlet 28 . As a result, the reentrant angle portion K1 at the boundary between the first wall portion 22 and the peripheral wall portion 21 has an obtuse angle, and the occurrence of turbulent flow due to the sample air 91 at the reentrant angle portion K1 can be suppressed. As a result, the sample air 91 introduced from the inlet 28 can smoothly flow to the outlet 29 . The angle of the reentrant portion K1 may be any obtuse angle, for example, as long as it is an obtuse angle of less than 180 degrees. In addition, since the reentrant corner K1 has an obtuse angle, it is possible to prevent the reentrant corner K1 from becoming a dead space, and to suppress the accumulation of dust on the reentrant corner K1. The outer surface of the first wall portion 22 is also inclined in the same manner as the inner surface of the first wall portion 22 .

In addition, the reentrant corner portion K1 is arranged closer to the second wall portion 23 than an opening end 30a of the diaphragm portion 30, which will be described later, on the second wall portion 23 side (that is, the first passage 33 side). It is As a result, the sample air 91 smoothly flows through the reentrant corner K1, and the generation of turbulence in the reentrant corner K1 and the accumulation of dust on the reentrant corner K1 can be further suppressed. Note that the positional relationship between the opening end 30a of the diaphragm portion 30 and the reentrant corner portion K1 is not limited to the above. For example, the reentrant corner portion K1 may be arranged at the same position as the opening end 30a of the diaphragm portion 30, or at a position closer to the hole portion 22a than the opening end 30a.

The narrowed portion 30 is provided at the edge portion 28 a of the inlet 28 . That is, the introduction portion 26 has a narrowed portion 30 at the edge portion 28 a of the introduction port 28 . More specifically, the narrowed portion 30 is provided at the edge portion 28a of the introduction port 28 on the second wall portion 23 side (that is, on the first passage 33 side). The narrowed portion 30 protrudes toward the second wall portion 23 side. The narrowed portion 30 is provided along the entire circumferential direction of the edge portion 28a of the introduction port 28 on the side of the first passage 33 . That is, the diaphragm portion 30 is formed in a tubular shape.

An inner peripheral surface 30 b of the narrowed portion 30 is connected to an inner peripheral surface of the introduction port 28 . An inner peripheral surface (inner surface) 30b of the narrowed portion 30 is directed toward the inside of the introduction port 28 toward the second wall portion 23 side (that is, the first passage 33 side) with respect to the central axis direction of the introduction port 28. sloping in the direction That is, the narrowed portion 30 narrows the opening area of the introduction port 28 gradually toward the second wall portion 23 side. With this configuration, even if the dust 92a contained in the sample air 91 flows on the inner peripheral surface of the inlet 28, the inclined inner peripheral surface 30b of the throttle portion 30 allows the dust 92a to flow through the opening surface of the collector 3 (to be described later). It can be skipped to the center of the first open end 31). As a result, the dust 92a easily flows into the collecting body 3, and the separation accuracy of separating the dust 92a from the sample air 91 can be further improved.

In addition, the outer peripheral surface (outer surface) 30c of the narrowed portion 30 extends toward the inside of the introduction port 28 toward the second wall portion 23 side (that is, the first passage 33 side) with respect to the central axis direction of the introduction port 28. It is slanted in the direction it is heading. With this configuration, the inclined outer peripheral surface 30c of the narrowed portion 30 allows the sample air 91 to generate an entrainment flow W1 in the vicinity of the outer peripheral surface 30c of the narrowed portion 30 . The entrained flow W1 can pick up the dust 92c that has strayed from the narrowed portion 30 to the outside of the narrowed portion 30 and fly it to the collector 3. As shown in FIG. As a result, separation leakage (that is, collection leakage) of the dust 92 in the collector 3 can be reduced, and the separation accuracy of separating the dust 92 from the sample air 91 can be further improved.

Further, as described above, the narrowing portion 30 narrows the edge portion 28a of the inlet 28, so that the flow velocity of the sample air 91 increases when the sample air 91 passes through the narrowing portion 30. FIG. As a result, the sample air 91 that has passed through the narrowed portion 30 can effectively involve the air in the vicinity of the outer peripheral surface 30c of the narrowed portion 30 to generate the entrainment flow W1.

Describing the shape of the second wall portion 23, the second wall portion 23 is formed, for example, in the shape of a cone. In other words, the inner surface of the second wall portion 23 gradually changes from the hole portion 23a side (that is, the discharge port 29 side) of the second wall portion 23 toward the outer peripheral edge 23b side in the direction of the central axis of the discharge port 29. , is inclined away from the central axis of the outlet 29 in a direction perpendicular to the central axis of the outlet 29 . As a result, the reentrant angle portion K2 between the second wall portion 23 and the peripheral wall portion 21 has an obtuse angle, and the occurrence of turbulence due to the sample air 91 at the reentrant angle portion K2 can be suppressed. As a result, the sample air 91 introduced from the inlet 28 can smoothly flow to the outlet 29 . The angle of the reentrant portion K2 may be any obtuse angle, for example, as long as the obtuse angle is less than 180 degrees. In addition, since the reentrant corner K2 has an obtuse angle, it is possible to prevent the reentrant corner K2 from becoming a dead space, thereby suppressing the accumulation of dust on the reentrant corner K2. In addition, the outer surface of the second wall portion 23 is also inclined similarly to the inner surface of the second wall portion 23 .

Further, the reentrant corner portion K2 is arranged closer to the first wall portion 22 than the opening end 29a of the discharge port 29 on the first wall portion 22 side (that is, the first passage 33 side). As a result, the sample air 91 smoothly flows through the reentrant corner K2, which further suppresses the occurrence of turbulence in the reentrant corner K2 and the accumulation of dust on the reentrant corner K2. Note that the positional relationship between the opening end 29a of the discharge port 29 and the reentrant corner portion K2 is not limited to the above. For example, the reentrant corner portion K2 may be arranged at the same position as the opening end 29a of the discharge port 29, or at a position closer to the hole portion 23a than the opening end 29a.

The collector 3 is housed in the housing 2 and configured to collect the dust 92 contained in the sample air 91 introduced from the inlet 28 (that is, separate the dust 92 from the sample air 91). ing. The collector 3 is made of metal, synthetic resin, or the like. The collector 3 has a cone-like outer shape (that is, a cylindrical shape with a truncated cone shape (for example, a truncated cone shape)). The collector 3 includes a circular first open end 31, a circular second open end 32, a first passage 33 connecting the first open end 31 and the second open end 32, and a projecting portion 34 . Each opening surface of the first opening end 31 and the second opening end 32 is orthogonal to the central axis of the housing 2 .

In this collector 3, the dust 92 enters the first passage 33 from the first opening end 31 and reaches the second opening end 32 (that is, passes through the first passage 33). is collected by the collector 3. The dust 92 is separated from the sample air 91 by collecting the dust 92 with the collector 3 .

The first passage 33 is formed such that the cross section parallel to the opening surface 31 a of the first opening end 31 becomes larger as it approaches the first opening end 31 from the second opening end 32 . That is, the inner peripheral surface of the first passage 33 is formed in a cone shape. This makes it easier for the dust 92 flying toward the collector 3 from the inlet 28 to enter the first passage 33 . The central axis of the first passage 33 (that is, the central axis of the collector 3) coincides with the central axis of the inlet 28. As shown in FIG. That is, the central axis of the first passage 33 is aligned with the central axis of the introduction port 28 on a straight line (chain line Q1 in FIG. 1). The outer peripheral surface of the first passage 33 is also formed in a cone shape.

The first open end 31 (open end) is arranged to face the introduction port 28 . More specifically, the first opening end 31 is arranged to face the opening end (edge portion 28a) of the introduction port 28 on the collector 3 side. The second open end 32 passes through the first passage 33 and is arranged to face the open end of the introduction port 28 on the throttle portion 30 side. The second open end 32 is arranged to face the open end of the through passage 44 of the dust sensor 4 . The first opening end 31 faces the opening end 30a of the throttle portion 30 with a predetermined distance therebetween. The second open end 32 is in contact with and faces the through passage 44 of the sensor body 41 .

The collector 3 is formed such that the opening area (inner diameter R1) of the first opening end 31 is equal to or larger than the opening area (inner diameter R2) of the inlet 28 (first hose 26) (R1≧R2). . The collector 3 is formed such that the opening area of the first opening end 31 is larger than the opening area (inner diameter R3) of the second opening end 32 (R1>R3). Furthermore, the collector 3 is formed so that the opening area of the second opening end 32 is equal to or larger than the opening area (diameter R4) of the through passage 44 of the dust sensor 4 (R3≧R4).

The ratio between the opening area of the first opening end 31 and the opening area of the introduction port 28 is not limited to the illustrated ratio. If the opening area of the first opening end 31 is greater than or equal to the opening area of the introduction port 28 (that is, R1≧R2), what is the ratio between the opening area of the first opening end 31 and the opening area of the introduction port 28? ratio. The ratio between the opening area of the first opening end 31 and the opening area of the second opening end 32 is not limited to the illustrated ratio. If the opening area of the first opening end 31 is larger than the opening area of the second opening end 32 (that is, R1>R3), the opening area of the first opening end 31 and the opening area of the second opening end 32 may be any ratio. The ratio between the opening area of the second opening end 32 and the opening area of the through path 44 is not limited to the illustrated ratio. If the opening area of the second opening end 32 is greater than or equal to the opening area of the through passage 44 (that is, R3≧R4), what is the ratio between the opening area of the second opening end 32 and the opening area of the through passage 44? ratio.

The distance between the opening end of the introduction port 28 on the side of the first passage 33 and the first opening end 31 is defined as a distance D2. The interval D2 is set so as to improve the collection accuracy of the collector 3 (in other words, the separation accuracy). The collection accuracy of the collector 3 becomes higher as the dust 92 (see FIG. 3A) that the collector 3 fails to collect is smaller. The interval D2 is set so that the resistance to the flow of the sample air 91 within the housing 2 is small (that is, the flow velocity of the sample air 91 flowing through the inlet 28 and the flow velocity of the sample air 91 flowing through the outlet 29 are equal to each other). It is desirable to set it so that the flow rate is the same). In this embodiment, regarding the interval D2, the better collection accuracy of the collector 3 is prioritized over the smaller resistance to the flow of the sample air 91 . Therefore, for example, the interval D2 is set so that the resistance to the sample air flow is smaller within the allowable range of the collection accuracy of the collector 3 .

The protrusion 34 protrudes from the inner peripheral surface 3 a of the collector 3 to the inside of the first passage 33 . In the first passage 33, the sample air 91 that has flowed from the first opening end 31 toward the back of the first passage 33 (that is, toward the second opening end 32 side) turns back (that is, flows backward), It has a channel when it flows toward the first open end 31 along the inner peripheral surface 3 a of the collector 3 . The protruding portion 34 reverses the sample air 91 flowing backward on the inner peripheral surface 3a of the collector 3 to merge with the sample air 91 flowing into the first passage 33 from the first open end 31, and the first to the back of the aisle 33. As a result, an entrainment flow W2 is generated in the vicinity of the inner peripheral surface 3a of the collector 3. As shown in FIG. That is, the projecting portion 34 generates the entrained flow W2 on the inner peripheral surface 3a of the collector 3 .

In the first passage 33, the sample air 91 flowing from the inlet 28 flows into the first passage 33 from the central region 31b of the opening surface 31a of the first open end 31, and flows into the first passage 33. through the center to the second open end 32 . Dust 92b straying from the center of the first passage 33 toward the inner peripheral surface 3a of the collector 3 is moved to the back of the first passage 33 by the entrained flow W2 generated near the inner peripheral surface 3a of the collector 3. can flow to As a result, collection leakage (that is, separation leakage) of the dust 92 in the collector 3 can be reduced, and the separation accuracy of separating the dust 92 from the sample air 91 can be improved. In this embodiment, the protrusion 34 protrudes in parallel to the opening surface 31a of the first opening end 31, but the protrusion 34 extends outside or outside the first passage 33 with respect to the opening surface 31a of the first opening end 31. You may incline and protrude inward.

The protrusion 34 is provided at the first open end 31 of the collector 3 . As a result, the entrained flow W2 can be generated over substantially the entire center axis direction of the collector 3 (that is, the range from the first open end 31 to the vicinity of the second open end 32). As a result, even if the dust 92 flies to any position in the central axis direction on the inner peripheral surface 3 a of the collector 3 , it can be flowed deep into the first passage 33 by the entrainment flow W<b>2 .

More specifically, the projecting portion 34 is provided, for example, over the entire periphery of the first opening end 31 . That is, the projecting portion 34 is formed in an annular plate shape. As a result, the entrained flow W2 can be generated over the entire circumferential direction of the first passage 33 . As a result, even if the dust 92 flies to any position in the circumferential direction of the inner peripheral surface 3 a of the collector 3 , it can be flowed deep into the first passage 33 by the entrainment flow W<b>2 .

The protruding portion 34 is arranged in an outer region 31c of the opening surface 31a of the first opening end 31 outside the central region 31b facing the introduction port 28 . That is, the length of the projecting portion 34 in the projecting direction is set so that the tip of the projecting portion 34 does not protrude into the central region 31b. With this configuration, it is possible to prevent the projecting portion 34 from preventing the sample air 91 from flowing into the first passage 33 from the inlet 28 . In this embodiment, the projecting portion 34 is arranged in the outer region 31c. 30a) may be located in an area outside the area facing 30a). Similar effects can be obtained in this case as well.

The dust sensor 4 is housed in the housing 2 and configured to detect the dust 92 collected by the collector 3 . That is, the dust sensor 4 is configured to detect dust 92 contained in sample air 91 . The dust sensor 4 is, for example, a photoelectric sensor. The dust sensor 4 includes a sensor main body 41, a light emitting section 42, and a light receiving section 43, as shown in FIG.

The sensor main body 41 is formed in a rectangular parallelepiped box shape from a light-shielding synthetic resin or the like. The sensor main body 41 includes a front plate 411 (see FIG. 3B) provided on the inflow side and a back plate 412 (see FIG. 3B) provided on the outflow side. The front plate 411 has a first passage hole 441 (see FIG. 3B) through which the sample air 91 passes. The back plate 412 has a second passage hole 442 (see FIG. 3B) through which the sample air 91 passes.

The sensor main body 41 has a cylindrical through-path 44 formed between the first through-hole 441 and the second through-hole 442 . The through passage 44 is formed substantially in the center of the sensor main body 41 . The through passage 44 faces the collector 3 and the adhesive member 7 . The sample air 91 is introduced into the sensor body 41 through the first passage hole 441 and discharged out of the sensor body 41 through the second passage hole 442 . That is, the dust 92 collected by the collector 3 passes through the through passage 44 .

The sensor main body 41 has a connection port 451 and a connection port 452 as shown in FIG. 3A. The connection port 451 has a round shape and is located on the left side of the through passage 44 in the sensor main body 41 . A joint 54 to be described later is connected to the connection port 451 . The connection port 452 has a round shape and is located on the left side of the through passage 44 in the sensor main body 41 . A joint 57 to be described later is connected to the connection port 452 .

The opening area of the through passage 44 is smaller than the opening area of the inlet 28 and the opening area of the outlet 29 . That is, the opening areas of the first through hole 441 and the second through hole 442 are smaller than the opening areas of the inlet 28 and the outlet 29 .

The light emitting part 42 is housed inside the sensor main body 41 and configured to emit light toward the through passage 44 . The light emitting portion 42 is provided on the right side of the through passage 44 in the sensor main body 41 . The light emitting unit 42 includes a light emitting element that emits light, a drive circuit that drives the light emitting element, and a lens that converts the light emitted from the light emitting element into parallel light. A light-emitting element is, for example, a light-emitting diode. The light emitting unit 42 irradiates the through path 44 with parallel light. That is, the light emitting part 42 irradiates the sample air introduced from the first passage hole 441 and passing through the sensor main body 41 with parallel light.

The light receiving section 43 is housed inside the sensor main body 41 and configured to receive light emitted from the light emitting section 42 and reflected by the dust particles 92 passing through the through passage 44 . More specifically, the light receiving portion 43 is provided to the right of the through passage 44 inside the sensor main body 41 . The light receiving section 43 includes a lens that collects the light reflected by the dust particles 92 passing through the through path 44 onto a light receiving element, a light receiving element that receives the light, and an amplifier that amplifies the output signal of the light receiving element. The light receiving element is, for example, a photodiode or a phototransistor. The light receiving section 43 receives the light reflected by the dust particles 92 contained in the sample air 91 . Of the light emitted from the light emitting section 42 , the light not reflected by the dust 92 traverses the through-path 44 and is not received by the light receiving section 43 .

The dust detection system 1 includes a support 11 for supporting the collector 3 and the dust sensor 4 on the housing 2, as shown in FIG. The support 11 is made of metal, synthetic resin, or the like. The support 11 is attached to the housing 2 . In the support 11, the central axis of each of the introduction port 28 and the discharge port 29, the central axis of the collector 3, and the central axis of the through passage 44 of the dust sensor 4 are on a substantially straight line (chain line Q1 in FIG. 1). The collector 3 and the dust sensor 4 are supported in the housing 2 so as to be aligned with each other. The supporting member 11 can be adjusted in the front-rear direction (vertical direction in FIG. 1) in the mounting position of the supporting member 11 with respect to the housing 2, and the opening end of the inlet 28 on the side of the first passage 33 and the collector 3 are separated from each other. Preferably, the distance D2 between the first open end 31 can be adjusted.

The support 11 includes a base portion 11a and a plurality of (for example, four) leg portions 11b. The base portion 11a is a portion to which the collector 3 and the dust sensor 4 are fixed. The base portion 11a has, for example, a substantially rectangular plate shape, and the dust sensor 4 is fixed to one of main surfaces on both sides of the base portion 11a. In this embodiment, the collector 3 is fixed to the dust sensor 4 and fixed to the base portion 11a via the dust sensor 4 . The plurality of leg portions 11b are portions that connect the housing 2 and the base portion 11a. The four leg portions 11b are provided so as to protrude from the other main surface of the base portion 11a to the peripheral wall portion 21 of the housing 2 at the periphery (for example, four corners) of the other main surface of the base portion 11a. One end of each leg portion 11 b is fixed to the other main surface of the base portion 11 a , and the other end portion of each leg portion 11 b is fixed to the inner peripheral surface of the peripheral wall portion 21 of the housing 2 .

The air blow mechanism 5 is connected to an air supply source (not shown), as shown in FIG. It is The air blow mechanism 5 includes a first air blow mechanism 51 and a second air blow mechanism 52, as shown in FIG. The air 83 is clean air that does not contain the dust 92 or the like (at least does not contain the dust 92 to be detected). The air 83 preferably has the same component ratio as the atmosphere. However, the air 83 is not limited to having the same component ratio as the atmosphere, and may contain an appropriate gas component.

The first air blow mechanism 51 is configured to inject air 83 toward the light receiving section 43 from a position facing the light receiving section 43 within the sensor main body 41, as shown in FIG. 3A. That is, the first air blow mechanism 51 is configured to emit high pressure air 83 toward the light receiving portion 43 .

The first air blow mechanism 51 has a nozzle 53 and a joint 54 . The nozzle 53 is provided inside the sensor main body 41 . More specifically, the nozzle 53 is provided inside the sensor main body 41 at a position facing the light receiving surface of the light receiving section 43 . The nozzle 53 has an injection port 531 through which the air 83 is injected. The joint 54 is provided outside the sensor main body 41 and allows the nozzle 53 and the passage pipe 55 to communicate with each other. That is, the joint 54 is attached to the connection port 451 to connect the nozzle 53 and the passage pipe 55 . The passage pipe 55 is, for example, a tube, through which air 83 from the air supply source 82 passes. That is, air 83 from the air supply source 82 is jetted from the nozzle 53 toward the light receiving portion 43 through the passage pipe 55 and the joint 54 .

The second air blow mechanism 52 is configured to inject air 83 toward the light emitting section 42 from a position facing the light emitting section 42 inside the sensor main body 41 . That is, the second air blow mechanism 52 is configured to emit high pressure air 83 toward the light emitting portion 42 .

The second air blow mechanism 52 has a nozzle 56 and a joint 57 . The nozzle 56 is provided inside the sensor body 41 . More specifically, the nozzle 56 is provided inside the sensor main body 41 at a position facing the light emitting surface of the light emitting section 42 . The nozzle 56 has an injection port 561 through which the air 83 is injected. The joint 57 is provided outside the sensor main body 41 and allows the nozzle 56 and the passage pipe 58 to communicate with each other. That is, the joint 57 is attached to the connection port 452 to connect the nozzle 56 and the passage pipe 58 . The passage pipe 58 is, for example, a tube through which air 83 from an air supply source 82 passes. That is, the air 83 from the air supply source 82 is jetted from the nozzle 56 toward the light emitting portion 42 through the passage pipe 58 and the joint 57 .

The flow velocity sensor 6 shown in FIG. 1 is configured to measure the flow velocity of sample air 91 . The flow velocity sensor 6 is provided, for example, between the dust sensor 4 and the discharge port 29 inside the housing 2 . More specifically, the flow velocity sensor 6 is mounted downstream of the sensor main body 41 and near the inlet of the discharge port 29 .

A turbulent flow of the sample air 91 is generated in the vicinity of the inlet 28, so that the flow velocity of the sample air 91 fluctuates greatly. Therefore, the flow velocity of the sample air 91 cannot be measured accurately. Therefore, the flow velocity sensor 6 is preferably arranged at a position where the sample air 91 is not turbulent but laminar. Therefore, the flow velocity sensor 6 is attached near the entrance of the discharge port 29 . Note that the flow velocity sensor 6 is not limited to be arranged near the inlet of the discharge port 29, and may be arranged at a position where the sample air 91 flows not in a turbulent flow but in a laminar flow. For example, the flow velocity sensor 6 may be attached to the first hose 26 or may be attached to the second hose 27 .

By the way, the measurement result of the flow velocity sensor 6 is used when determining the detection period of the dust sensor 4 . The dust sensor 4 passes through the through passage 44 at a detection period T2 shorter than the time T1 (=L1/V1) obtained by dividing the length L1 of the through passage 44 by the flow velocity V1 measured by the flow velocity sensor 6. Dust 92 is detected. As a result, detection omission of the dust 92 passing through the through passage 44 can be prevented. For example, when the length L1 of the through passage 44 is 20 mm and the flow velocity V1 measured by the flow velocity sensor 6 is 20 m/s, the time T1 is 1 ms. Therefore, the detection period T2 may be 0.5 ms, for example.

The adhesive member 7 is configured to collect dust 92 passing through the through passage 44 . The adhesive member 7 is film-like and has an adhesive surface. The adhesive member 7 is provided between the through passage 44 and the discharge port 29 at a position where the adhesive surface faces the opening surface (second passage hole 442 ) of the through passage 44 .

The dust detection system 1 includes a plate 71 having an opening 713 as a support mechanism for supporting the adhesive member 7, as shown in FIG. The plate 71 is inserted into the mounting hole 201 (see FIG. 1) of the housing 2 and guided by the guide member 46 of the dust sensor 4 .

The plate 71 is made of synthetic resin, metal, or the like and formed into a plate shape. The plate 71 integrally includes a body portion 711 and a tip portion 712 . The body portion 711 has a circular opening 713 and a plurality of elongated through holes 714 . The opening 713 is an opening for collecting dust and is covered with the adhesive member 7 . That is, the adhesive member 7 is attached to the plate 71 so that the adhesive surface faces the through passage 44 and covers the opening 713 . Each through hole 714 is a through passage for sample air, and sample air 91 passes through each through hole 714 .

Further, as shown in FIG. 1 , the dust sensor 4 has a guide member 46 that guides the plate 71 . The guide member 46 is made of metal or synthetic resin. The guide member 46 is attached so as to be in contact with the sensor main body 41 . The guide member 46 has two grooves 461 . Each groove 461 has substantially the same shape as the cross-sectional shape of the main body portion 711 of the plate 71 perpendicular to the longitudinal direction. A plate 71 is inserted into each groove 461 . Thereby, the guide member 46 guides the plate 71 to the opening 713 of the plate 71 (that is, the position where the adhesive member 7 faces the opening surface of the through passage 44).

Furthermore, the housing 2 has mounting holes 201 for mounting the plate 71 . More specifically, the mounting hole 201 is formed in the peripheral wall portion 21 of the housing 2, for example. When collecting the dust 92 using the adhesive member 7, a plate 71 is inserted into the attachment hole 201 as shown in FIG. Accordingly, the adhesive member 7 attached to the plate 71 can be arranged inside the housing 2 without disassembling the housing 2 . On the other hand, when the dust 92 is not collected, the guide member 46 is removed from the sensor main body 41 and the attachment hole 201 is closed with a cover member.

Next, the operation of the dust detection system 1 according to this embodiment will be described with reference to FIG. A sample air 91 is introduced into the housing 2 through the inlet 28 . On the other hand, a dust collection mechanism (not shown) is connected to the discharge port 29 , and the dust collection mechanism sucks the sample air 91 through the discharge port 29 , thereby causing the flow of the sample air 91 from the introduction port 28 toward the discharge port 29 . occur.

The sample air 91 is introduced into the housing 2 from the inlet 28, passes through the space surrounded by the collector 3 and the housing 2 (that is, the second passage S1), and is discharged to the outside from the outlet 29. . At that time, when the sample air 91 enters the housing 2 from the inlet 28 , the flow of the sample air 91 is throttled by the throttle portion 30 . This increases the flow velocity of the sample air 91 . As a result, the sample air 91 effectively entrains air in the vicinity of the outer peripheral surface 30c of the narrowed portion 30, thereby generating an entrained flow W1 on the outer peripheral surface 30c of the narrowed portion 30. FIG.

A part of the sample air 91a of the sample air 91 introduced from the inlet 28 flows into the first passage 33 from the central region 31b of the opening surface 31a of the first opening end 31, and flows into the first passage 33. through the center of the passage 33 and flows toward the back of the first passage 33. A part of the sample air 91 a passes through the through passage 44 of the dust sensor 4 . The rest of the sample air 91 a does not enter the through passage 44 of the dust sensor 4 and flows backward along the inner peripheral surface 3 a of the collector 3 toward the first open end 31 . The backflowing sample air 91a is returned to the center of the first passage 33 by the projecting portion 34 provided on the collector 3, and flows toward the back of the first passage 33 again. As a result, an entrainment flow W2 is generated on the inner peripheral surface 3a of the collector 3. As shown in FIG.

On the other hand, after the dust 92 contained in the sample air 91 is introduced into the housing 2 from the inlet 28, it flows straight according to the law of inertia and passes through the center of the first passage 33 of the collector 3. It passes through the through passage 44 of the dust sensor 4 . However, some of the dust 92b collides with the inner peripheral surface 3a of the collector 3 rather than directly advancing from the first open end 31 of the collector 3 to the through passage 44 . The dust 91b that collides with the inner peripheral surface 3a of the collector 3 in this way passes through the center of the first passage 33 by the entrainment flow W2 generated on the inner peripheral surface 3a of the collector 3, and flows into the first passage 33. and passes through the first passageway 33 back into the sample air 91a flowing into the interior of the chamber. Thereby, the collection accuracy of the collector 3 is improved.

Among the dust particles 92, dust particles 92a flowing on the inner peripheral surface of the introduction port 28 are thrown up by the inner peripheral surface 30b of the narrowed portion 30 when introduced into the housing 2 from the introduction port 28. It is blown to the center of the first passage 33 and put on the flow of the sample air 91a. The dust 92a then passes through the first passage 33 with the sample air 91a. As a result, dust 92 a flowing on the inner peripheral surface of inlet 28 can also be collected by collector 3 . As a result, the collection accuracy of the collector 3 is further improved. Of the dust particles 92a splashed up by the inner peripheral surface 30b of the narrowed portion 30, the dust particles 92 that collide with the inner peripheral surface 3a of the first passage 33, like the dust particles 92b described above, It is made to pass through the first passage 33 by the entrainment flow W2 generated on the surface 3a.

Among the dust particles 92 contained in the sample air 91, the dust particles 92c that have diverted to the outside of the throttle section 30 when passing through the throttle section 30 are caused by the entrainment flow W1 generated near the outer peripheral surface 30c of the throttle section 30. It is picked up and returned to the sample air 91 flow. As a result, the dust 92c that has diverted to the outside of the throttle section 30 is blown to the center of the first passage 33 by the sample air 91 and passes through the first passage 33 . Thereby, the collection accuracy of the collector 3 is further improved.

After that, the dust sensor 4 detects the dust 92 collected by the collector 3 (that is, the dust that has passed through the first passage 33). Dust 92 that has passed through the through passage 44 of the dust sensor 4 comes out of the through passage 44 and adheres to the adhesive member 7 . Then, the flow velocity sensor 6 measures the flow velocity of the sample air 91 . After that, the sample air 91 is discharged out of the housing 2 from the discharge port 29 .

As described above, in the dust detection system 1 according to the present embodiment, the collector 3 is provided with the projecting portion 34 . can generate an entrainment flow W2. Dust 92b that has deviated from the center of first passage 33 toward inner peripheral surface 3a of collector 3 can be caused to flow deep into first passage 33 again by this entrainment flow W2. As a result, collection leakage (that is, separation leakage) in the collector 3 can be reduced, and collection accuracy and separation accuracy in the collector 3 can be improved.

In addition, since the inlet 28 is provided with the narrowed portion 30, even if the dust 92 contained in the sample air 91 contains the dust 92a flowing on the inner peripheral surface of the inlet 28, the narrowed portion 30 The dust 92a can be thrown to the center of the first passage 33 by the inner peripheral surface 30b. As a result, even the dust 92a flowing on the inner peripheral surface of the inlet 28 can be made to flow deep into the first passage 33, and the collection accuracy and separation accuracy of the collector 3 can be further improved.

Next, the operation of the air blow mechanism 5 according to this embodiment will be described with reference to FIGS. 3A to 5B.

First, the operation of the first air blow mechanism 51 will be described. As shown in FIGS. 3A and 3B, the first air blow mechanism 51 injects air 83 from a nozzle 53 provided at a position facing the light receiving section 43 . As shown in FIGS. 4A and 4B, the dust 92 remaining on the light receiving section 43 due to adhesion or the like is blown away by the air 83 . After that, as shown in FIGS. 5A and 5B, the dust 92 blown away by the air 83 passes through the through passage 44 and is discharged out of the sensor main body 41 from the second passage hole 442 .

Next, operation of the second air blow mechanism 52 will be described. The second air blow mechanism 52 is also similar to the first air blow mechanism 51 . First, the second air blow mechanism 52 injects air 83 from a nozzle 56 provided at a position facing the light emitting section 42 . The dust 92 remaining on the light-emitting portion 42 due to adhesion or the like is blown off by the air 83 . After that, the dust 92 blown off by the air 83 passes through the through-path 44 and is discharged out of the sensor main body 41 from the second passage hole 442 .

In this way, when the dust 92 contained in the sample air 91 adheres to the light emitting part 42 and the light receiving part 43 of the dust sensor 4, the air blow mechanism 5 injects the air 83 to the light emitting part 42, dust 92 adhering to the dust sensor 4 can be released to the outside. As a result, the air 83 can be jetted to the light receiving portion 43 and the dust 92 adhering to the light receiving portion 43 can be discharged to the outside of the dust sensor 4 .

(Modification)
The embodiment described above is but one of the various embodiments of the present disclosure. The above-described embodiment can be modified in various ways according to design and the like, as long as the object of the present disclosure can be achieved. Modifications of the above embodiment are listed below. Modifications described below can be applied in combination as appropriate.

(Modification 1)
Although the dust detection system 1 is arranged vertically in the above embodiment, it may be arranged horizontally. When placed horizontally, the dust detection system 1 is arranged such that the center line of the housing 2 extends in the left-right direction. That is, the dust detection system 1 is arranged, for example, so that the inlet 28 is positioned on the right side of the housing 2 and the outlet 29 is positioned on the left side of the housing 2 . Also in this case, the collection accuracy and separation accuracy of the collector 3 can be further improved as in the above-described embodiment.

(Modification 2)
Although the first wall portion 22 and the second wall portion 23 are formed in a cone shape in the above embodiment, they may be formed in a flat plate shape as shown in FIG. In this case, the reentrant angle portion K1 at the boundary between the first wall portion 22 and the peripheral wall portion 21 and the reentrant angle portion K2 at the boundary between the second wall portion 23 and the peripheral wall portion 21 are at right angles. Alternatively, only one of the first wall portion 22 and the second wall portion 23 may be formed in a flat plate shape.

(Modification 3)
The separation device 100 of the above embodiment may further include a movable mechanism 80 (see FIG. 7) that changes the distance D2 between the introduction port 28 and the first open end 31 of the collector 3 . A movable mechanism 80 shown in FIG. 7 supports the collector 3 so as to be movable with respect to the housing 2 in the vertical direction (that is, the direction toward or away from the introduction port 28). The movable mechanism 80 is improved in the support 11 so that the base portion 11a can move vertically with respect to the leg portion 11b.

More specifically, in the movable mechanism 80, the base portion 11a has a plurality of (for example, four) long holes 11c. The plurality of elongated holes 11c correspond to the plurality of (for example, four) leg portions 11b one-to-one, and are holes through which the screws 11d for attaching the corresponding leg portions 11b to the base portion 11a are inserted. Each long hole 11c extends in the vertical direction and penetrates through the base portion 11a in the thickness direction. A plurality of elongated holes 11c are provided in the peripheral portion (for example, four corners) of the base portion 11a. Each screw 11d is inserted from one side of the base portion 11a into the corresponding long hole 11c and screwed into one end face of the corresponding leg portion 11b. The head of each screw 11d is larger than the width of the long hole 11c in the lateral direction (direction orthogonal to the longitudinal direction). This prevents the head of the screw 11d from contacting the peripheral edge of the long hole 11c and removing the screw 11d from the long hole 11c.

Each screw 11d is relatively movable along the corresponding long hole 11c between both ends in the longitudinal direction (that is, the vertical direction) of the long hole 11c. Thereby, the base portion 11a can move in the vertical direction relative to the leg portion 11b within the range of the length of the elongated hole 11c.

In this movable mechanism 80 , when the base portion 11 a is moved upward relative to the leg portion 11 b , the collector 3 and the dust sensor 4 are moved upward relative to the housing 2 . That is, the distance D2 between the introduction port 28 and the collector 3 is reduced. On the other hand, when the base portion 11a is moved downward relative to the leg portion 11b, the collector 3 and the dust sensor 4 are moved downward relative to the housing 2. As shown in FIG. That is, the distance D2 between the introduction port 28 and the collector 3 is widened.

7, the adhesive member 7, the guide member 46 and the plate 71 are omitted from illustration. In the above embodiment, the plate 71 supporting the adhesive member 7 is inserted into both the mounting hole 201 of the housing 2 and the groove 461 of the guide member 46 (see FIG. 1). However, in this modified example, the plate 71 is inserted only into the groove 461 out of the mounting hole 201 and the groove 461 . As a result, the connection between the plate 71 and the housing 2 is released, and the adhesive member 7 supported by the plate 71 becomes movable together with the dust sensor 4 .

(Other modifications)
In the above-described embodiment, the throttle portion 30 is provided over the entire circumferential direction of the edge portion 28a of the inlet 28, but the throttle portion 30 is provided only in a portion of the circumferential direction of the edge portion 28a of the inlet port 28. may be provided. For example, when the dust detection system 1 is placed horizontally, the restrictor 30 may be provided only on the lower half of the edge 28 a of the inlet 28 .

Moreover, in the above-described embodiment, the projecting portion 34 is provided over the entire circumferential direction of the collector 3 , but the projecting portion 34 may be provided only partially in the circumferential direction of the collector 3 . For example, in a horizontal arrangement of the dust detection system 1 , the protrusion 34 may be provided only on the lower half of the collector 3 .

Further, in the above-described embodiment, the protruding portion 34 is provided at the first open end 31 on the inner peripheral surface 3a of the collector 3, It may be provided at any position between 31 and the second open end 32 .

Moreover, in the above embodiment, the sample air 91 is used as an example of the sample fluid, but the sample liquid may be used.

Also, in the above embodiment, the inlet 28 and the outlet 29 are formed in a cylindrical shape, but they may not be cylindrical. For example, the inlet 28 may be a hole provided in the first wall 22 (for example, hole 22a). Similarly, the outlet 29 may also be a hole provided in the second wall 23 (for example, hole 23a).

(summary)
As explained above, the separation device (100) according to the first aspect comprises the cylinder (3). The barrel (3) has an open end (31). The open end (31) faces the inlet (28) of the inlet (26) through which the sample fluid (91) is introduced. A first passage (33) and a second passage (S1) are formed. The first passageway (33) is a passageway surrounded by the cylindrical body (3), and dust (92) contained in the sample fluid (91) flows from the open end (31). A second passageway (S1), separate from the first passageway (33), is located outside the barrel (3), through which the inlet (28) and the sample fluid (91) are discharged. The sample fluid (91) flows through the outlet (29) of the outlet (27). The barrel (3) comprises a protrusion (34). The protrusion (34) protrudes inside the first passageway (33).

According to this configuration, the projecting portion (34) can generate a swirling flow (W2) of the sample fluid (91) in the vicinity of the inner peripheral surface (3a) of the cylindrical body (3). This entrainment flow (W2) moves the dust (92b) straying from the center of the first passage (33) toward the inner peripheral surface (3a) of the cylindrical body (3) to the back of the first passage (33). can flow again to This can reduce separation leakage of the dust (92) in the first passage (33) and improve the separation accuracy of separating the dust (92) from the sample fluid (91).

In the separation device (100) according to the second aspect, in the first aspect, the first passageway (33) is configured such that the sample fluid flowing from the open end (31) toward the back of the first passageway (33) is (91) has a flow path when it turns back and flows toward the open end (31) along the inner peripheral surface (3a) of the cylindrical body (3).

According to this configuration, the protruding part (34) allows the sample fluid (91) to flow toward the open end (31) by folding back at the back of the first passageway (33) and returning it to the first passageway (33). It can be folded back so that it faces the back of the Thereby, the entrainment flow (W2) can be generated.

In the separation device (100) according to the third aspect, in the first or second aspect, the protrusion (34) is provided at the open end (31).

According to this configuration, the entrained flow (W2) generated by the projecting portion (34) is distributed over substantially the entire longitudinal direction of the inner peripheral surface (3a) of the cylindrical body (3) (thus, along the first passageway). (33) up to the open end (31)). As a result, no matter where on the inner peripheral surface (3a) of the cylindrical body (3) the dust (92) flies, it can be flowed back into the first passage (33) by the entrainment flow (W2). .

In the separation device (100) according to the fourth aspect, in any one aspect of the first to third aspects, the projection (34) is located on the opening surface (31a) of the opening end (31). It is arranged in a region (31c) outside the region (31b) facing the mouth (28).

According to this configuration, it is possible to prevent the projecting portion (34) from preventing the sample fluid (91) from entering the first passageway (33) from the inlet (28).

In the separation device (100) according to the fifth aspect, in any one of the first to fourth aspects, the introduction part (26) has a constriction part ( 30). The inner surface (30b) of the narrowed portion (30) is inclined toward the inside of the introduction port (28) toward the first passage (33) with respect to the central axis direction of the introduction port (28). ing.

According to this configuration, even if the dust (92a) contained in the sample fluid (91) flows on the inner peripheral surface of the inlet (28), the above-mentioned Dust (92a) can be blown to the center of the first passageway (33). This allows the dust (92a) to flow deep into the first passage (33), further improving the separation accuracy of separating the dust (92) from the sample fluid (91).

In the separation device (100) according to the sixth aspect, in the fifth aspect, the outer surface (30c) of the constricted portion (30) extends in the direction of the central axis of the inlet (28) (the direction of the dashed-dotted line Q1 in FIG. 1). , it is inclined toward the inside of the introduction port (28) toward the first passage (33) side.

According to this configuration, the inclined outer surface (30c) of the constricted portion (30) generates a swirling flow (W1) of the sample fluid (91) near the outer surface (30c) of the constricted portion (30). can be done. This entrained flow (W1) can pick up the dust (92c) that has strayed from the narrowed portion (30) to the outside of the narrowed portion (30) and fly it to the first passage (33). This can reduce separation leakage of the dust (92) in the first passage (33) and further improve the separation accuracy of separating the dust (92) from the sample fluid (91).

In the separation device (100) according to the seventh aspect, in any one of the first to sixth aspects, the distance between the inlet (28) and the open end (31) of the first passageway (33) is It further comprises a movable mechanism (80) for changing (D2).

According to this configuration, the separation accuracy for separating the dust (92) from the sample fluid (91) can be adjusted. Also, the flow velocity of the sample fluid (91) flowing through the housing (2) can be adjusted.

A separation device (100) according to an eighth aspect, in any one of the first to seventh aspects, further comprises a housing (2). The housing (2) has a wall (22) and a peripheral wall (21). The wall portion (22) is provided with an introduction portion (26). The peripheral wall (21) is connected to the outer peripheral edge (22b) of the wall (22). The inner surface of the wall portion (22) extends in a direction perpendicular to the central axis of the inlet (28) from the inlet (28) toward the outer peripheral edge (22b). at , away from the central axis of the inlet (28).

According to this configuration, it is possible to suppress the occurrence of turbulent flow at the reentrant corner (K1) at the boundary between the wall (22) and the peripheral wall (21). As a result, the sample fluid (91) introduced from the inlet (28) can smoothly flow to the outlet (29).

A dust detection system (1) according to the ninth aspect includes a separation device (100) and a dust sensor (4). The separation device (100) is a separation device according to any one of the first to third aspects. The dust sensor (4) detects dust (92) that has passed through the first passageway (33).

According to this configuration, it is possible to provide the dust detection system (1) having the above effects.

1 dust detection system 2 housing 4 dust sensor 21 peripheral wall 22 first wall (wall)
22b Outer edge 26 First hose (introduction part)
27 second hose (discharge)
28 Inlet 28a Edge 29 Outlet 30 Constricted portion 30b Inner peripheral surface (inner surface)
30c outer peripheral surface (outer surface)
31 first open end (open end)
31a opening surface 31b central region (region facing the inlet)
31c outer region (outer region)
33 first passage 34 projecting portion 80 movable mechanism 91 sample air (sample fluid)
92, 92a, 92b, 92c Dust 100 Separator D2 Spacing S1 Second passage

Claims (15)

a housing having an introduction section into which a sample fluid is introduced and a discharge section through which the sample fluid is discharged;
arranged inside the housing,Opposite the introduction port of the introduction partfirstcylinder with open endWhen,with
A passage surrounded by the cylinder,firsta first passage into which dust contained in the sample fluid flows from an open end;
separate from the first passage, surrounded by said housinga passageway disposed outside the tubular body and extending between the introduction port and the frontrecorda second passage connecting with the outlet of the exit portion and through which the sample fluid flows;
The cylindrical body has a protruding portion that protrudes inward of the first passage.,
the tips of the protrusions face each other
separation device. In the first passage, the sample fluid that has flowed from the first opening end toward the back of the first passage turns back and flows along the inner peripheral surface of the cylindrical body toward the first opening end. 2. The separation device of claim 1, having a flow path for flow through. The separation device according to claim 1 or 2, wherein the protrusion is provided at the first opening end. 4. The separation device according to any one of claims 1 to 3, wherein the projecting portion is arranged in a region outside a region facing the introduction port in the opening surface of the first opening end. The introduction part has a narrowed part at the edge of the introduction port,
5. The inner surface of the narrowed portion is inclined toward the inner side of the introduction port toward the first passage with respect to the central axis direction of the introduction port. 10. Separation device according to claim 1. 6. The separation device according to claim 5, wherein the outer surface of the narrowed portion is inclined toward the inner side of the introduction port toward the first passage with respect to the central axis direction of the introduction port. The separation device according to any one of claims 1 to 6, further comprising a movable mechanism that changes the distance between the introduction port and the first opening end. The housing is
a wall portion provided with the introduction portion;
a peripheral wall portion connected to the outer peripheral edge of the wall portion;
The inner surface of the wall portion is inclined away from the central axis in a direction orthogonal to the central axis from the inlet toward the outer peripheral edge with respect to the direction of the central axis of the inlet. Item 8. The separation device according to any one of items 1 to 7. Further comprising an adhesive member,
The adhesive member is arranged inside the housing
Separation device according to any one of claims 1-8. The barrel further has a second open end,
The first open end is provided at one end of the cylindrical body,
The second open end is provided at the other end of the cylindrical body,
The adhesive member is provided in a direction from the introduction port to the discharge port when viewed from the cylinder, and faces the second open end of the cylinder.
10. Separation device according to claim 9. further comprising a plate provided with the adhesive member,
The housing has a mounting hole into which the plate is inserted
11. Separation device according to claim 10. Further comprising a guide member that supports the plate,
When the adhesive member faces the second open end, the plate has a portion supported by the guide member and a portion inserted into the mounting hole.
12. Separation device according to claim 11. Further, the housing comprises a flow velocity sensor,
The flow velocity sensor is arranged inside the housing
Separation device according to any one of claims 1-12. The flow velocity sensor is provided in a direction from the introduction port to the discharge port when viewed from the cylinder.
14. Separation device according to claim 13. further comprising a dust sensor that detects the dust that has passed through the first passage;
The detection cycle of the dust sensor is determined by the flow velocity of the sample fluid measured by the flow velocity sensor.
15. Separation device according to claim 13 or claim 14.

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