JP2015114176A - Particle measuring apparatus and particle measuring method - Google Patents

Abstract

A particle separation device, a particle measurement device, and a particle separation method capable of easily changing a particle classification range. A particle separation device (20A) of a particle measuring device (10A) supplies a fan (4) for generating an air flow for introducing gas from the outside, and electric power for generating a drive output by the fan (4). A power supply unit (21) that separates particles contained in the introduced gas by its inertial force. A first voltage drive state in which the first voltage is applied from the power supply unit (21) to the fan (4), and a second voltage lower than the first voltage is applied from the power supply unit (21) to the fan (4). There is provided a drive control section (22) for driving the fan 4 in an intermittent drive mode that continuously repeats the second voltage drive state. [Selection] Figure 1

Description

  The present invention relates to a particle separation device, a particle measurement device, and a particle separation method for separating and measuring the suspended particle size in the atmosphere using inertial force.

  As a particle measuring apparatus that separates fine particles floating in the atmosphere from coarse particles and measures the amount of the separated fine particles, for example, an apparatus disclosed in Patent Document 1 can be cited. In the fine particle separation method disclosed in Patent Document 1, particles floating in a fluid are accelerated and separated by inertial force.

  Specifically, in the particle measuring apparatus 100 disclosed in Patent Document 1, as shown in FIG. 13, the coarse particle discharge straight pipe portion concentrically with the coarse particle discharge straight pipe portion 111 in the funnel-shaped sampling pipe 110. A straight particle collecting tube 120 having a diameter smaller than 111 is provided in the vicinity.

  In the particle measuring apparatus 100, when the fine particles floating in the atmosphere are separated from the coarse particles, the fine particles are sucked from the suction side 111a of the coarse particle discharge straight pipe portion 111 by a pump (not shown). In addition, the particulate collecting straight pipe 120 is also sucked by a pump (not shown) from the suction side 121.

  As a result, the particle-containing fluid 101 containing fine particles and coarse particles floating in the atmosphere flows in along the tapered portion 112 of the sampling tube 110. For this reason, after being accelerated by the nozzle portion 113, it is discharged near the inlet of the coarse particle discharging straight pipe portion 111 and near the inlet of the fine particle collecting straight pipe 120. In FIG. 13, the right half flow path line is omitted.

  At this time, since the coarse particles 101a have a large inertia force, they are transported to the main flow 102 and removed from the straight particle portion 111 for discharging the coarse particles. On the other hand, since the microparticle 101b has a small inertial force, the microparticle 101b is reversed toward the fine particle collecting straight pipe 120 and is conveyed to the tributary 103 in the opposite direction and sent to the fine particle collecting straight pipe 120.

  As a result, the coarse particles 101a and the fine particles 101b contained in the particle-containing fluid 101 are separated. In the separation method of Patent Document 1, the particle classification characteristics are changed by adjusting the flow rate of the main flow 102 and the tributary flow 103 and adjusting the overall length of the nozzle portion 113 and its interval by moving the fine particle collecting straight pipe 120 up and down. Can be done.

JP 2004-89898 A (published on March 25, 2004)

  However, the conventional particle separation apparatus, particle measurement apparatus, and particle separation method for classifying particles by the above inertial force have the following problems.

  That is, the particle size to be classified depends on the inertial force. For this reason, when the measurement for fine particles and the measurement for coarse particles are to be performed with one measuring device, a drive unit and a drive circuit capable of changing the inertial force, or a different particle size is used. A drive part and a flow path are required. As a result, the cost increases.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a particle separation device, a particle measurement device, and a particle separation method that can easily change the classification range of particles. .

  In order to solve the above-described problem, a particle separation device according to an aspect of the present invention supplies a fluid drive unit that generates an air flow that introduces a gas from the outside, and electric power for the fluid drive unit to generate a drive output. And a power supply unit that separates particles contained in the introduced gas by its inertial force, wherein a first voltage is applied from the power supply unit to the fluid drive unit. The fluid drive unit is operated in an intermittent drive mode that continuously repeats the drive state and a second voltage drive state in which a second voltage lower than the first voltage is applied from the power supply unit to the fluid drive unit. A drive control unit for driving is provided.

  In order to solve the above problems, a particle measuring apparatus according to an aspect of the present invention includes the particle separation apparatus described above and a particle detection unit that detects particles contained in the gas separated by the particle separation apparatus. It is a particle measuring apparatus provided, Comprising: Each repetition time in the continuous repetition of the 1st voltage drive state and 2nd voltage drive state of this particle separator when the said particle separator drives in an intermittent drive mode Among these, a detection state switching unit is provided that switches between a detection state in which particles are detected by the particle detection unit and a non-detection state in which particles are not detected by the particle detection unit at least once.

  In order to solve the above problems, a particle measuring apparatus according to an aspect of the present invention includes the particle separation apparatus described above and a particle detection unit that detects particles contained in the gas separated by the particle separation apparatus. It is a particle measuring apparatus provided, Comprising: Each repetition time in the continuous repetition of the 1st voltage drive state and 2nd voltage drive state of this particle separator when the said particle separator drives in an intermittent drive mode The detection condition switching unit is provided to switch the detection condition one or more times between a plurality of different detection conditions and cause the particle detection unit to detect particles under a plurality of different detection conditions. Yes.

  In order to solve the above-described problem, the particle separation method according to an aspect of the present invention generates a drive output from the power supply unit to the fluid drive unit that generates an air flow that introduces gas from the outside. In a particle separation method for separating particles contained in the introduced gas by inertia force, a first voltage drive state in which a first voltage is applied from the power supply unit to the fluid drive unit And the fluid drive unit is driven in an intermittent drive mode that continuously repeats a second voltage drive state in which a second voltage lower than the first voltage is applied from the power supply unit to the fluid drive unit. It is characterized by that.

  According to one aspect of the present invention, there is an effect of providing a particle separation device, a particle measurement device, and a particle separation method that can easily change the classification range of particles.

It is sectional drawing which shows the structure of the particle | grain measuring apparatus provided with the particle | grain separation apparatus in Embodiment 1 of this invention. It is a perspective view which shows the structure of the particle | grain measuring apparatus provided with the said particle | grain separator. It is sectional drawing which showed typically the state of the size division in the branch part of the particle-containing fluid introduce | transduced into the system through the introduction flow path in the said particle | grain separator. (A) is a wave form diagram which shows the drive output of the fan as a fluid drive part which generate | occur | produces by the application of the input voltage in the electric power supply part shown to (b), (b) is the application of the input voltage in an electric power supply part It is a wave form diagram which shows a state. (A) shows the particle | grain measuring apparatus provided with the particle separation apparatus of the modification in Embodiment 1, Comprising: The fan as a fluid drive part which generate | occur | produces by the application of the input voltage in the electric power supply part shown to (b) FIG. 4B is a waveform diagram showing an input voltage application state in the power supply unit. (A) shows the particle | grain measuring apparatus provided with the particle | grain separator in Embodiment 2 of this invention, Comprising: The fan as a fluid drive part which generate | occur | produces by the application of the input voltage in the electric power supply part shown to (b) FIG. 4B is a waveform diagram showing an input voltage application state in the power supply unit. It is sectional drawing which shows the structure of the particle | grain measuring apparatus provided with the particle | grain separation apparatus in Embodiment 3 of this invention. (A) is a wave form diagram which shows the drive output of the fan as a fluid drive part in the intermittent drive mode of the particle | grain measuring apparatus provided with the said particle | grain separator, (b) is the particle | grain measurement timing in the sensor in an intermittent drive mode. It is a timing chart which shows. It is sectional drawing which shows the structure of the particle | grain measuring apparatus provided with the particle | grain separation apparatus in Embodiment 4 of this invention. (A) is a wave form diagram which shows the drive output of the fan as a fluid drive part in the particle | grain measuring apparatus provided with the said particle | grain separator, (b) is a time division which makes a sensor detect a particle | grain for every divided | segmented time area | region. It is a timing chart which shows the setting state of a particle detection setting part. It is a block diagram which shows the particle | grain measuring apparatus provided with the said particle | grain separator, Comprising: It is a block diagram which shows the structure of a display apparatus. The particle measuring apparatus provided with the particle separation apparatus in Embodiment 5 of this invention, and the particle separation method are shown, Comprising: The drive of the fan as a fluid drive part in the case of switching drive between an intermittent drive mode and a continuous drive mode It is a wave form diagram which shows an output. It is sectional drawing which shows the structure of the conventional particle | grain separator.

[Embodiment 1]
One embodiment of the present invention will be described below with reference to FIGS.

  The particle measuring apparatus in the present embodiment includes a particle separation device that sucks a gas such as air from the outside and classifies particles contained in the gas by inertia force, and can measure the amount from fine particles to coarse particles It is.

[Configuration of particle measuring apparatus equipped with particle separator]
A configuration of a particle measuring apparatus including the particle separation apparatus according to the present embodiment will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a configuration of a particle measuring apparatus including the particle separation apparatus of the present embodiment. FIG. 2 is a perspective view showing a configuration of a particle measuring apparatus provided with the particle separation apparatus of the present embodiment.

  As shown in FIG. 2, the particle measuring apparatus 10 </ b> A according to the present embodiment includes a sensor 1 as a particle detection unit, an intake unit 2, a sizing unit 3, and a fan 4 as a fluid drive unit. . The particle measuring apparatus 10 </ b> A is configured to introduce external air from the intake section 2 by driving a single fan 4.

  As shown in FIG. 1, the air introduced into the particle measuring apparatus 10 </ b> A passes through a gas flow path formed in the particle measuring apparatus 10 </ b> A and is discharged to the outside through the fan 4. The sensor 1 is provided in the middle of the gas flow path formed in the particle measuring apparatus 10A, and measures the amount of fine particles contained in the passing air.

  As shown in FIG. 1, the gas flow path 5 formed in the particle measuring apparatus 10A includes an introduction flow path 5a, a main flow path 5b, a branch flow path 5c, a main flow discharge path 5d, and a branch flow discharge path 5e. Has been.

  The introduction flow path 5a is formed in the intake portion 2 and is a flow path for introducing a gas such as air from the outside. The main flow path 5b and the branch flow path 5c are flow paths branched in two directions at the branching portion A from the introduction flow path 5a. The main flow discharge path 5d connected to the main flow path 5b and the branch flow discharge path 5e connected to the branch flow path 5c are both flow paths for discharging gas to the outside.

  In the present embodiment, the particle separation device 20A in the particle measuring device 10A is composed of the fan 4, the gas flow path 5, the power supply unit 21, and the drive control unit 22. Then, by driving the fan 4, the particles contained in the gas introduced from the introduction channel 5 a, due to its inertial force, the main channel 5 b containing coarse particles and the branch channel containing microparticles in the branch part A. Separated into 5c, that is, sized. The principle of particle sizing included in the gas introduced from the introduction flow path 5a will be described later.

  The sensor 1, which is a measurement unit that measures fine particles, is provided in the middle of the branch flow path 5c, and measures the amount of fine particles in the gas that passes through the branch flow path 5c. Specifically, the sensor 1 measures the amount of fine particles in the gas by, for example, a light scattering method of irradiating fine particles in a passing air stream with light and detecting light scattered from the fine particles. However, the sensor 1 is not necessarily limited to the light scattering method, and may be one that measures the amount of fine particles in the gas by a gravimetric method. In addition, the particle detection unit that is a measurement unit that measures fine particles is not limited to the sensor 1, and includes, for example, a filter that collects the fine particles and measures the fine particles collected by the filter. May be. That is, the particle detector may be, for example, a concentration measuring device using light scattering, a component analyzer, or a particle collecting device using a filter.

  In the present embodiment, only one fan 4 is provided. Then, it functions as a fluid drive unit that generates an air flow from the introduction flow path 5a to the main flow discharge path 5d through the main flow path 5b and an air flow from the introduction flow path 5a to the main flow discharge path 5d through the branch flow path 5c. A front gas suction surface 4a of the fan 4 is connected to a main flow discharge path 5d and a branch flow discharge path 5e.

  In the present embodiment, as described above, the airflow passing through the branch flow path 5c is also discharged by the fan 4 via the branch flow discharge path 5e. Is configured. However, in the present invention, the present invention is not necessarily limited thereto. For example, by providing a separate fan 4 in the branch flow path 5c, the fluid driving unit can be configured by two fans 4.

  Further, the fluid drive unit in the present embodiment is configured by the fan 4. However, the present invention is not necessarily limited to this, as long as it can generate airflow from the introduction flow path 5a to the main flow discharge path 5d and the branch flow discharge path 5e via the main flow path 5b or the branch flow path 5c. For example, the fluid drive unit may be a pump.

  In the present embodiment, for example, a partition plate 6 is provided between the main flow discharge path 5d and the tributary discharge path 5e, and the branch flow path 5c passes from the main flow path 5b through the main flow discharge path 5d and the tributary discharge path 5e. To prevent backflow. However, in this invention, this partition plate 6 does not necessarily need to exist.

  Further, in the particle measuring apparatus 10A provided with the particle separation apparatus 20A of the present embodiment, as shown in FIG. 1, the power supply unit 21 that supplies power for generating a driving output by the fan 4 as a fluid driving unit. And a drive control unit 22 that controls the supply of drive power from the power supply unit 21 to the fan 4. Thereby, in the particle measuring apparatus 10A provided with the particle separation apparatus 20A of the present embodiment, not only the fine particles 8b but also the total particles can be measured by adding the coarse particles 8a to the fine particles 8b.

[Particle separation method and particle measurement method]
A particle separation method and a particle measurement method in the particle measurement device 10A including the particle separation device 20A having the above-described configuration will be described with reference to FIGS. FIG. 3 is a cross-sectional view schematically showing the state of sizing at the branching portion A of the particle-containing fluid introduced into the system through the introduction flow path 5a.

  In the particle measuring apparatus 10A provided with the particle separation apparatus 20A of the present embodiment, as shown in FIG. 1, an air fluid containing suspended particles (hereinafter referred to as “particle-containing fluid”) is driven by the fan 4. Is introduced as an air flow 7a into the particle measuring apparatus 10A through the introduction channel 5a inclined in a conical shape. The introduction flow path 5a has a configuration in which the cross-sectional area of the flow path becomes smaller in the cross-sectional shape perpendicular to the direction of the air flow 7a toward the branch portion A. For this reason, the particle-containing fluid introduced into the introduction flow path 5a is accelerated along the air flow 7a toward the branch portion A. Therefore, the introduction channel 5a is also referred to as a fluid acceleration unit.

  The air flow 7a of the particle-containing fluid branches into the main flow 7b and the branch flow 7c in the branch portion A. The main flow 7b and the branch flow 7c pass through the main channel 5b and the branch channel 5c sucked by the fan 4, respectively. By branching into the main flow 7b and the branch flow 7c by one fan 4 and sucking, a particle-containing fluid such as the atmosphere can be introduced into the system through the introduction flow path 5a.

  As shown in FIG. 3, the particle-containing fluid sucked into the system includes a particle-containing fluid containing microparticles 8b having a desired particle diameter when the air flow 7a branches into the main flow 7b and the branch flow 7c in the branch portion A. It is divided into a particle-containing fluid containing coarse particles 8a other than the desired particle size. At this time, the main flow 7b includes a particle-containing fluid containing coarse particles 8a other than the desired particle diameter. On the other hand, the tributary 7c includes a particle-containing fluid including microparticles 8b having a desired particle diameter.

  The particle sizing principle described above will be described.

  As shown in FIG. 3, the particle-containing fluid sucked into the system by the fan 4 accelerates toward the branch portion A of the introduction flow path 5a. Whether or not the particles contained in the particle-containing fluid move along the main flow 7b along the direction of the air flow 7a in the branching portion A is determined by the Stokes' formula, the particle density, diameter, velocity, and viscosity of the particle-containing fluid. Depends on.

  Therefore, since the particles contained in the particle-containing fluid have a higher speed as the particle size is larger, they follow the movement direction of the particle-containing fluid. For this reason, since the coarse particles 8a having a relatively large particle size have a large inertial force, they are transported to the main flow 7b along the direction of the air flow 7a and discharged from the main flow channel 5b to the main flow discharge channel 5d. As a result, it is difficult to enter the branch 7c side.

  On the other hand, the microparticle 8b having a relatively small particle diameter has a small inertial force. Therefore, the movement of the microparticle 8b is governed by the viscosity of the particle-containing fluid. For this reason, the microparticles 8b are mainly conveyed to the branch stream 7c in the direction opposite to the main stream 7b and sent to the branch channel 5c. In addition, a part is conveyed by the main flow 7b, and is sent into the main flow path 5b. Thus, only particles having a specific particle size or less can be guided to the tributary 7c depending on the velocity of the particles in the branch portion A.

  As described above, in the particle separation device 20A according to the present embodiment, the coarse particles 8a included in the particle-containing fluid sucked by the fan 4 are driven by the fan 4 due to the above-described flow path configuration and the arrangement of the fan 4. When driven by electric power, the branch portion A is not mixed with the branch flow passage 5c extending in the opposite direction to the main flow passage 5b. On the other hand, the microparticle 8b exists in both the main channel 5b and the branch channel 5c.

  Next, the particle-containing fluid containing the microparticles 8b sent to the branch flow path 5c is conveyed to the branch stream 7c and passes through the sensor 1 as shown in FIG. By passing through the sensor 1 in this way, the amount of fine particles 8b contained in the particle-containing fluid is measured.

  The particle-containing fluid containing the fine particles 8b that have passed through the sensor 1 in the branch flow path 5c flows out toward the branch discharge path 5e.

  On the other hand, the introduction flow path 5a, the main flow path 5b, and the fan 4 are arranged in substantially the same direction. By setting it as such a structure, the coarse particle 8a becomes easy to be discharged | emitted outside via the mainstream discharge channel 5d after branching to the main channel 5b, without flowing backward to the branch channel 5c. Therefore, the coarse particles 8a that are not the measurement target can be efficiently removed.

  As described above, the main flow 7b of the particle-containing fluid containing the coarse particles 8a passes through the main flow path 5b extending from the branch portion A to the main flow discharge path 5d arranged on the lower side so as to be the shortest distance, and is discharged into the main flow. It is discharged from the path 5d. On the other hand, the branch flow 7c of the particle-containing fluid containing the microparticles 8b extends from the branch portion A in the opposite direction to the main flow channel 5b and passes through the branch flow channel 5c that bypasses the sensor 1 and merges with the branch flow discharge channel 5e. , And is discharged from the tributary discharge path 5e. Thus, since the coarse particles 8a and the fine particles 8b are sized at the branch portion A, the particle-containing fluid including the coarse particles 8a among the particle-containing fluid sucked from the outside passes through the sensor 1. Without being discharged outside. On the other hand, the particle-containing fluid containing the fine particles 8b is discharged to the outside after the amount is measured by the sensor 1.

  As described above, in the particle separation device 20A and the particle measurement device 10A according to the present embodiment, the air flow 7a of the particle-containing fluid sucked from the outside is branched into the main flow 7b and the branch flow 7c at the branching portion A. At the time of branching, the coarse particles 8a and the fine particles 8b are sized. Further, the main flow 7b and the main flow discharge passage 5d, the branch flow 7c and the branch flow discharge passage 5e are joined to one gas suction surface 4a and discharged to the outside. Further, branching between the main flow 7 b and the branch flow 7 c is realized by a single fan 4. Then, by providing the sensor 1 in the middle of the branch flow path 5c, the amount of fine particles 8b in the particle-containing fluid of the branch flow 7c is measured.

  Therefore, it is possible to realize a particle measuring apparatus that is small and inexpensive compared to the technique of Patent Document 1 that uses two drive sources such as two pumps.

  Here, the flow velocity of the main flow 7b of the main flow channel 5b and the flow velocity of the branch flow 7c of the branch flow channel 5c need to be adjusted with high accuracy. For example, when the flow velocity of the main flow 7b is larger than the optimum value and the flow velocity of the branch flow 7c is smaller than the optimum value, not only the coarse particles 8a but also most of the fine particles 8b flow to the main flow path 5b side. As a result, the amount of the fine particles 8b flowing toward the branch flow path 5c is small, and thus the coarse particles 8a and the fine particles 8b cannot be properly separated. On the other hand, when the flow velocity of the main flow 7b is smaller than the optimum value and the flow velocity of the branch flow 7c is larger than the optimum value, a part of the coarse particles 8a flows to the branch flow channel 5c side. The particles 8b cannot be properly separated. The flow velocity of the main flow 7b and the flow velocity of the branch flow 7c are determined by the flow passage resistance of the main flow passage 5b and the branch flow passage 5c and the exhaust speed of the fan 4, respectively. Among these, the channel resistance is a value determined by the shapes of the main channel 5b and the branch channel 5c, and cannot be adjusted unless the channel shape is changed. On the other hand, the exhaust speed is a value that can be adjusted only by adjusting the output of the fan 4 and is relatively easy to adjust. Therefore, as in the technique of Patent Document 1, the coarse particle discharge straight pipe portion 111 and the fine particle collecting straight pipe portion 120 shown in FIG. And adjustment of the flow velocity of the fluid in each of the straight pipe 120 for collecting fine particles can be easily performed. On the other hand, in the particle measuring apparatus 10 </ b> A, both the main flow path 5 b and the branch flow path 5 c are exhausted by the single fan 4. For this reason, the subject that the exhaust velocity in each flow path, ie, the flow velocity of the main flow 7b and the branch flow 7c, cannot be freely adjusted by the output of the fan 4 remains.

  In order to make full use of the exhaust speed of the fan 4 with respect to the flow rates of the main flow 7b and the branch flow 7c, it is desirable to make the area of the gas suction surface 4a in the fan 4 as wide as possible and use it for exhaust. . In order to take such a form, the particle measuring apparatus 10A has a configuration in which the gas suction surface 4a obtained by joining the main flow path 5b and the main flow discharge path 5d, the branch flow path 5c and the branch flow discharge path 5e is connected to the fan 4. ing.

  In such a configuration, when the gas suction surface 4a of the fan 4 is blocked, the resistance increases and the performance as a drive source of the fan 4 cannot be sufficiently exhibited. Therefore, in order to exhibit the performance of the fan 4 sufficiently, in the particle measuring apparatus 10A, a space having the same area as the gas suction surface 4a is provided in a portion directly above the suction side of the fan 4. That is, a space formed by the gas suction surface 4a, the main flow discharge path 5d, and the tributary discharge path 5e is secured. As a result, the main flow 7b is discharged outside through the space formed by the main flow discharge path 5d and the gas suction surface 4a. On the other hand, the tributary 7c is discharged to the outside through a space formed by the tributary discharge path 5e and the gas suction surface 4a.

  Here, as shown in FIG. 3, in the particle measuring apparatus 10A of the present embodiment, the flow path length of the branch flow path 5c is longer than the flow path length of the main flow path 5b. For this reason, the branch flow 7c has a larger flow path resistance than the main flow 7b. As a result, the flow velocity of the branch stream 7c at the branch portion A can be reduced.

  Conversely, on the gas suction surface 4a where the main flow 7b and the tributary 7c merge, the main flow 7b has a higher flow velocity than the tributary 7c, and therefore turbulence occurs. As a result, in the main flow discharge path 5d and the branch flow discharge path 5e, a part of the coarse particles 8a included in the main flow 7b may flow backward to the branch flow path 5c.

  Therefore, in the particle measuring apparatus 10A according to the present embodiment, as shown in FIG. 1, the main flow 7b discharged from the main flow path 5b and the main flow discharge path 5e are discharged between the main flow discharge path 5d and the branch flow discharge path 5e. It is preferable that a partition plate 6 is provided for partitioning the branch stream 7c. The partition plate 6 is provided, for example, at the center of the main flow discharge path 5d and the tributary discharge path 5e. That is, the area of the gas suction surface 4a divided by the partition plate 6 is the same in the main flow discharge path 5d and the tributary discharge path 5e. The partition plate 6 prevents the main flow 7b and the branch flow 7c from joining. As a result, the backflow of particles between the main channel 5b and the branch channel 5c can be prevented.

  The position of the partition plate 6 is not limited to the center between the main flow discharge path 5d and the tributary discharge path 5e. For example, on the gas suction surface 4a partitioned by the partition plate 6, the area through which the main flow 7b passes may be different from the area through which the tributary 7c passes. Thus, by arranging the partition plate 6 at a position shifted from the center in the main flow discharge path 5d and the branch flow discharge path 5e, a particle measuring device 10A in which the ratio of the flow velocity of the main flow 7b and the flow velocity of the branch flow 7c is changed is realized. can do.

  Moreover, the angle and thickness of the partition plate 6 may differ between the main flow path 5b side and the branch flow path 5c side. Moreover, the partition plate 6 shown in FIG. 1 is flat plate shape. However, the shape of the partition plate 6 is not limited to a flat plate shape as long as it prevents the merging of the main flow 7b and the branch flow 7c, and may have a curved surface. Further, the partition plate 6 may have a structure that surrounds the outlet portion of the branch 7c in the branch discharge path 5e.

[Total particle measurement]
By the way, in the particle measuring apparatus 10A provided with the particle separation apparatus 20A having the above-described configuration, when the rated voltage is supplied from the power supply unit 21 to the fan 4, the sensor 1 separates the particle size and falls within a certain range. Only the measurement in the fine particle measurement mode for measuring the particles of the tributary 7c including only the fine particles can be performed.

  However, using the particle measuring apparatus 10A provided with the particle separating apparatus 20A of the present embodiment, the whole particle measuring mode is used to measure the particles of the air flow containing the mixed fine particles and coarse particles without separating the size of the fine particles. It is preferable that measurement can be performed with

  Here, conventionally, a single particle detector and a particle separation method that enable both the fine particle measurement mode and the coarse particle measurement mode, or both the fine particle measurement mode and the total particle measurement mode, by a simple method. There was no particle measuring device that employs. That is, conventionally, for example, a particle measuring device that separates the size of particles contained in a gas by a particle separation device using centrifugal force and detects the separated particles is known. However, in the conventional particle measuring device, for example, in the particle measuring mode in which the fluid driving unit such as a fan is continuously rotated at a high speed, only the particles flow into the air passage on the detector side. For this reason, fine particles can be accurately measured, but coarse particles cannot be detected. As a result, the particle measuring apparatus employing the conventional particle separating apparatus and particle separating method does not have the function of the whole particle measuring mode for measuring the particle diameter including coarse particles.

  Here, in order to have the function of the whole particle measurement mode, in addition to the particle separation device that separates a certain range of particle sizes, a plurality of separate particle separation devices that separate the other range of particle sizes are provided in the vicinity. There is also a method in which a stand is provided and used as a total particle measurement mode by the plurality of particle separation devices. However, this method increases costs by increasing the number of detectors.

  As another method for providing the function of the whole particle measurement mode, there is a method of continuously rotating a fluid drive unit such as a fan at a low speed. Thereby, the inertial force of the coarse particles is changed, and the function of the whole particle measurement mode can be realized by using one detector. However, this method has the following problems.

  That is, there are generally two methods for reducing the speed of a fluid drive unit such as a fan, a voltage control method and a PWM (Pulse Width Modulation) control method.

  The voltage control method is a method for reducing the rotational speed of a fluid drive unit such as a fan by reducing the voltage supplied to the fluid drive unit such as a fan. However, in general, the range of output voltage in which a fluid drive unit such as a fan can operate is limited. For this reason, when a voltage falls largely compared with a rated voltage, fluid drive parts, such as a fan, do not drive. That is, in the voltage control method, the range in which the rotational speed of the fluid drive unit such as a fan can be controlled is extremely limited. Further, when the voltage is controlled using a variable resistor or the like, power loss is caused by lowering the voltage.

  On the other hand, the PWM control method is a method for controlling the rotational speed of a fluid drive unit such as a fan by controlling the duty ratio of a pulse wave supplied to the fluid drive unit such as a fan. This method can control the rotational speed of a fluid drive unit such as a fan in a wider range than the voltage control method, and can reduce voltage loss. However, the PWM control controls the pulse wave with a cycle as short as the rotation cycle of a fluid drive unit such as a fan. For this reason, since it is necessary to mount a complicated circuit, cost becomes high.

  Therefore, in the particle separation device 20A of the present embodiment, the drive control unit 22 shown in FIG. 1 is changed from the power supply unit 21 shown in FIG. 1 to the fluid drive unit as shown in FIGS. The first voltage driving state by the first input voltage VH0 as the first voltage to the fan 4 and the second input voltage as the second voltage lower than the first input voltage VH0 from the power supply unit 21 to the fan 4 The driving operation is performed in the intermittent driving mode in which the second voltage driving state by VL0 is continuously repeated.

  Further, the particle measuring apparatus 10A according to the present embodiment includes the particle separation apparatus 20A and a sensor 1 as a particle detection unit that detects particles contained in the gas separated by the particle separation apparatus 20A. Furthermore, the particle measuring apparatus 10A includes a detection control unit 11 including a detection state switching unit 11a that switches between a detection state in which the sensor 1 detects particles and a non-detection state in which the sensor 1 does not detect particles, that is, particle detection is stopped. I have. Specifically, the detection state switching unit 11a of the present embodiment continues the first voltage driving state and the second voltage driving state of the particle separation device 20A when the particle separation device 20A is driven in the intermittent drive mode. In each repetition time in a typical repetition, switching between a detection state in which the sensor 1 detects particles and a non-detection state in which the particle detection unit does not detect particles is performed one or more times.

  Further, in the particle separation method of the present embodiment, the first voltage drive state by the first input voltage VH0 from the power supply unit 21 to the fan 4 and the first input voltage VH0 from the power supply unit 21 to the fan 4 The driving operation in the intermittent driving mode in which the second voltage driving state with the lower second input voltage VL0 is continuously repeated is performed.

  Specifically, in the present embodiment, as shown in FIGS. 4A and 4B, during normal driving, the drive control unit 22 supplies the first input voltage VH0 from the power supply unit 21 to the fan 4. Control to do. Thereby, the fan 4 continues the first voltage driving state at the driving output P1.

  On the other hand, in the intermittent drive mode, the fan 4 is switched between the drive state and the non-drive state by switching the input voltage between the second input voltage VL0 = zero voltage and the first input voltage VH0 = rated voltage at regular intervals. Then, particle separation is performed while changing the drive output of the fan 4 between the drive outputs PL0 to PH0 and the drive outputs PH0 to PL0.

  As a result, as described above, according to the Stokes' formula, whether the particles move along the main flow 7b along the direction of the air flow 7a depends on the density, diameter, velocity, and viscosity of the particle-containing fluid. In the case of particles, the larger the particle size, the lower the speed of fluid movement. Therefore, in the particle separation device 20A using the inertial force of particles, in the intermittent drive mode, the inertial force applied to the particles is smaller than the continuation state of the first voltage drive state during normal drive. It is possible to separate the particles with different sizing characteristics.

  Here, in FIGS. 4A and 4B, the fan 4 is switched to the non-driving state immediately after reaching the rated driving output PH0 from the state where the driving output PL0 of the fan 4 is zero voltage. However, the present invention is not necessarily limited to this, and the fan 4 can be driven with the drive output PH0 for a certain period of time after reaching the drive output PH0.

  As described above, in the present embodiment, the fluid driving unit is not limited to the fan 4 but may be a pump. Since these can be switched between a drive state and a non-drive state, they are suitable as a fluid drive unit. In the present embodiment, the driving state of the fan 4 or the like is switched by switching between the second input voltage VL0 and the first input voltage VH0 that are input voltages to the fan 4 or the like, that is, input power to the fan 4 or the like. However, another power source may be used.

  As described above, in the particle separation device 20A, the particle measurement device 10A, and the particle separation method of the present embodiment, as the power supply from the power supply unit 21 to the fan 4, the high first input voltage VH0 and the low voltage The second input voltage VL0 is periodically repeated continuously. As a result, immediately after the application of the first input voltage VH0 or immediately after the first input voltage VH0 is switched to the second input voltage VL0, the fan 4 is driven at a lower output than the normal driving according to the rating. And during that time, coarse particles 8a to be sized can reach the sensor 1. As a result, the detection control unit 11 switches the detection state switching unit 11a to a detection state in which the sensor 1 detects particles. In addition, the detection control part 11 switches the detection state switch part 11a to the non-detection state which stops the particle | grain detection of the sensor 1, when the 2nd input voltage VL0 is a zero voltage.

  As a result, in this embodiment, the drive circuit unit for changing the output or the PWM drive circuit is not necessary, so that the low-cost drive control unit 22 can measure the coarse particles 8a.

  Therefore, it is possible to provide the particle separation device 20A, the particle measurement device 10A, and the particle separation method that can easily change the particle classification range.

  Here, in the particle separation device 20A, the particle measurement device 10A, and the particle separation method of the present embodiment, the particle sizes are not separated in the total particle measurement mode. For this reason, it is not necessary to keep the wind speed of the branch flow path 5c constant, and the air volume may fluctuate. That is, it is only necessary to ensure a low air volume state in which coarse particles 8a sufficient for measurement flow into the branch flow path 5c for at least part of the measurement time. Based on such a concept, it can be said that the particle separation device 20A, the particle measurement device 10A, and the particle separation method of the present embodiment can realize measurement in the whole particle measurement mode by the intermittent drive mode.

  Here, the difference from PWM control will be described.

  That is, in the PWM control, since the electric power is supplied to the fan 4 in pulses, it cannot be said that it is an intermittent driving mode by on / off driving depending on the viewpoint. However, in the case of PWM control, the pulse is controlled at a cycle approximately the same as the rotation cycle of the fan 4, whereas the intermittent drive mode by the on / off drive of the present embodiment is longer than that compared to that. The difference is that the on / off driving is performed in a cycle. Specifically, the pulse period in PWM control is, for example, around 10 kHz. On the other hand, in this embodiment, it is 0.25 Hz, for example, and at most 10 Hz.

  As a result, the intermittent drive mode of the present embodiment has a longer on / off drive period than the PWM control pulse output. Therefore, the circuit used for such driving may be simpler and less expensive than the PWM control circuit, and thus the cost can be reduced.

  In the particle separation device 20A, the particle measurement device 10A, and the particle separation method of the present embodiment, it is basically assumed that the rated voltage and the zero voltage are repeated. For this reason, the disadvantages of the voltage control method described in the technical background do not occur.

  As described above, the particle separation device 20A according to the present embodiment includes the fan 4 that generates an air flow that introduces gas from the outside, and the power supply unit 21 that supplies electric power for the fan 4 to generate a drive output. Have. Further, the particles contained in the introduced gas are separated by the inertial force. Then, the first voltage driving state in which the first input voltage VH0 is applied from the power supply unit 21 to the fan 4, and the second input voltage VL0 lower than the first input voltage VH0 is applied from the power supply unit 21 to the fan 4. A drive control unit 22 that drives the fan 4 in an intermittent drive mode that continuously repeats the applied second voltage drive state is provided.

  The particle measuring apparatus 10A according to the present embodiment includes a sensor 1 that detects particles contained in the gas separated by the particle separating apparatus 20A, a detection state that causes the sensor 1 to detect particles, and particles that are detected by the sensor 1. A detection control unit 11 including a detection state switching unit 11a that switches to a non-detection state in which particle detection is not performed, that is, particle detection is stopped is provided.

  Further, in the particle separation method in the present embodiment, the electric power for generating the driving output of the fan 4 from the electric power supply unit 21 is supplied to the fan 4 that generates an air flow for introducing the gas from the outside, and is introduced. The particles contained in the gas are separated by their inertial force. Then, the first voltage driving state in which the first input voltage VH0 is applied from the power supply unit 21 to the fan 4, and the second input voltage VL0 lower than the first input voltage VH0 is applied from the power supply unit 21 to the fan 4. The fan 4 is driven in an intermittent drive mode that continuously repeats the applied second voltage drive state.

  As a result, as the power supply from the power supply unit 21 to the fan 4, the first input voltage VH0 having a high voltage and the second input voltage VL0 having a low voltage are periodically and continuously repeated. As a result, immediately after application of the first input voltage VH0 or immediately after switching the first input voltage VH0 to the second input voltage VL0, the fan 4 is driven at a lower output than the rated normal drive. And during that time, coarse particles 8a to be sized can reach the sensor 1. As a result, the detection control unit 11 switches the detection state switching unit 11a to a detection state in which the sensor 1 detects particles. In the present embodiment, since the second input voltage VL0 is a zero voltage, the detection control unit 11 switches the detection state switching unit 11a to a non-detection state where the sensor 1 does not detect particles.

  As a result, in this embodiment, the drive circuit unit for changing the output or the PWM drive circuit is not necessary, so that the low-cost drive control unit 22 can measure the coarse particles 8a.

  Therefore, it is possible to provide the particle separation device 20A, the particle measurement device 10A, and the particle separation method that can easily change the particle classification range.

  In the particle separation device 20A of the present embodiment, the second input voltage VL1 as the second voltage is a zero voltage that does not supply power from the power supply unit 21 to the fan 4 as the fluid drive unit. It has become.

  As a result, the drive control unit 22 only needs to turn on / off the first input voltage VH0 as the first voltage applied from the power supply unit 21, so that the control in the drive control unit 22 is simplified.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention. For example, in the intermittent drive mode in the particle separation device 20A, the particle measurement device 10A, and the particle separation method of the above embodiment, the first input voltage VH0 as the first voltage = the first voltage drive state by the rated voltage, By repeating the second input voltage VL0 as the second voltage lower than the first input voltage VH0 = the second voltage driving state by the zero voltage, the drive output of the fan 4 is changed from the minimum drive output PH0 = 0 to the maximum. It was repeated between the drive output PH0.

  However, the present invention is not necessarily limited thereto. For example, as shown in FIGS. 5A and 5B, in the intermittent drive mode, the first input voltage VH0 as the first voltage = the first voltage drive state based on the rated voltage, By repeating the second input voltage VL0 as the second voltage lower than the first input voltage VH0 = the second voltage drive state by the zero voltage, the drive output of the fan 4 is changed to the drive output PL1 (> drive output PL0 = zero). It is also possible to employ a particle separation device 20A ′, a particle measurement device 10A ′, and a particle separation method that repeat between the output and the drive output PH1 (<drive output PH0).

  That is, the first input voltage VH0 as the first voltage in the power supply unit 21 = the time when the fan 4 reaches the drive output PH1 before the maximum drive output PH0 is reached in the first voltage drive state with the rated voltage. Thus, the second input voltage VL0 is switched to the second voltage driving state of zero voltage. As a result, the drive output of the fan 4 turns back at the drive output PH1 (<drive output PH0) and then decreases.

  On the other hand, when the fan 4 reaches the drive output PL1 before reaching the minimum drive output PL0, the second input voltage VL0 as the second voltage in the power supply unit 21 is equal to the zero-voltage second voltage drive state. The first input voltage VH0 is switched to the first voltage driving state of the rated voltage. As a result, the drive output of the fan 4 turns back at the drive output PL1 (> drive output PL0) and then increases.

  Also by this driving method, it is possible to provide a particle separation device 20A ', a particle measurement device 10A', and a particle separation method that can easily change the particle classification range.

  The switching of the power supply time of the power supply unit 21 is performed by the drive control unit 22 by a method such as switching by a timer or switching by a switch based on rotation speed detection.

  In the above description, it is also possible to repeat between the drive output PL1 (≧ drive output PL0 = zero output) and the drive output PH1 (≦ drive output PH0).

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and explanation thereof is omitted.

  In the intermittent drive mode in the particle separation device 20A ′, the particle measurement device 10A ′, and the particle separation method of the first embodiment, the drive output of the fan 4 is driven from the drive output PL1 (> drive output PL0 = zero output). In order to repeat between the output PH1 (<drive output PH0), the first input voltage VH0 as the first voltage = the first voltage drive state with the rated voltage and the second voltage lower than the first input voltage VH0 The second input voltage VL0 = the second voltage driving state with zero voltage was continuously repeated.

  However, in the intermittent drive mode in the particle separation device 20B, the particle measurement device 10B, and the particle separation method of the present embodiment, the first input voltage VH1 as the first voltage (<first input voltage VH0 = rated voltage). And a second voltage driving state by a second input voltage VL1 (> second input voltage VL0 = zero voltage) as a second voltage lower than the first input voltage VH1 is continuously repeated. Is different.

  A drive method in the intermittent drive mode in the particle separation device 20B, the particle measurement device 10B, and the particle separation method of the present embodiment will be described based on FIGS. 6 (a) and 6 (b). FIG. 6 (a) shows a particle measuring apparatus 10B provided with a particle separation apparatus 20B in the present embodiment, which is generated by applying an input voltage in the power supply unit 21 shown in FIG. 6 (b). It is a wave form diagram which shows the drive output of the fan 4 as a fluid drive part. FIG. 6B is a waveform diagram showing an input voltage application state in the power supply unit 21.

  In the particle measuring apparatus 10B provided with the particle separation apparatus 20B of the present embodiment, as shown in FIGS. 6A and 6B, as in the first embodiment, during normal driving, the drive control unit 22 Controls to supply the first input voltage VH0 from the power supply unit 21 to the fan 4. Thereby, the fan 4 continues the first voltage driving state at the driving output PH0. As a result, the sensor 1 can detect the fine particles 8b.

  On the other hand, in the intermittent drive mode, the input voltage is set to a first input voltage VH1 (<first input voltage VH0 = rated voltage) and a second input voltage VL1 (second voltage lower than the first input voltage VH1) at regular intervals. > Second input voltage VL0 = zero voltage).

  That is, the first input voltage VH1 is lower than the first input voltage VH0 (= rated voltage) shown in FIGS. 5A and 5B of the first embodiment, and the second input voltage VL1 is the first embodiment. 1 is higher than the second input voltage VL0 (= zero voltage) shown in FIGS.

  Then, the fan 4 is switched between the driving state and the non-driving state by the control by the drive control unit 22 with respect to the power supply unit 21. Thereby, particle separation is performed while changing the drive output of the fan 4 between the drive outputs PL1 to PH1 and the drive outputs PH1 to PL1.

  In FIGS. 6A and 6B, according to the first input voltage VH1 (<first input voltage VH0 = rated voltage) as the first voltage, the first voltage drive state is established, and the first input voltage VH1 The second voltage drive state is the second input voltage VL1 (> second input voltage VL0 = zero voltage) as the lower second voltage. However, the present invention is not necessarily limited to this, and only in the second voltage driving state, the second input voltage VL1 as the second voltage lower than the first input voltage VH1 (> second input voltage VL0 = zero voltage). The first voltage driving state can be based on the first input voltage VH0 (= rated voltage) as the first voltage.

  Also in the present embodiment, the fan 4 may be driven with the drive output PH1 or the drive output PH0 for a certain period of time.

  Further, as in the first embodiment, the fluid drive unit may be any device that can switch between a drive state and a non-drive state, such as a fan 4 or a pump. Further, the driving state is switched by, for example, switching on / off the input power from the power supply unit 21 to the fan 4 or the like.

  As described above, in the particle measuring apparatus 10B including the particle separation apparatus 20B according to the present embodiment, the second input voltage VL1 as the second voltage in the intermittent drive mode is not the power from the power supply unit 21 to the fan 4. It is larger than the second input voltage VL0 as a zero voltage to be supplied.

  That is, in the particle separation device 20A in the first embodiment, when the drive control unit 22 causes the fan 4 to perform the drive operation in the intermittent drive mode, the first input voltage VH0 as the first voltage and the second voltage The second input voltage VL0 as a voltage basically means a rated voltage and a zero voltage.

  However, the driving operation in the intermittent drive mode is not necessarily limited to the rated voltage and the zero voltage, and the second input voltage VL1 as the second voltage may be made larger than the zero voltage.

  As a result, it is possible to prevent the fan 4 from being completely stopped, so that it is possible to prevent the inertial force from being uncontrolled in the intermittent drive mode.

[Embodiment 3]
The following will describe still another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first embodiment and the second embodiment. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiment 1 and Embodiment 2 are given the same reference numerals, and explanation thereof is omitted.

  In the particle separation devices 20A and 20B, the particle measurement devices 10A and 10B, and the particle separation method according to the first and second embodiments, the first voltage driven state by the first voltage and lower than the first voltage are mainly used. The intermittent drive mode in which the second voltage drive state by the second voltage is continuously repeated has been described.

  In the present embodiment, one variation of the measurement method for the fine particles 8b and all particles in the intermittent drive mode will be described.

  Configurations and operations of the particle separation device 20C and the particle measurement device 10C according to the present embodiment will be described with reference to FIGS. 7 and 8A. FIG. 7 is a cross-sectional view showing a configuration of a particle measuring apparatus 10C provided with a particle separation apparatus 20C in the present embodiment. FIG. 8A shows a particle measuring apparatus 10C provided with the particle separation apparatus 20C in the present embodiment, and is a waveform diagram showing a driving output of the fan 4 as a fluid driving unit in the intermittent driving mode. .

  In the particle measuring apparatus 10C including the particle separation apparatus 20C of the present embodiment, as shown in FIG. 7, the detection control unit 11 includes a detection condition switching unit 11c, a time-division detection / detection unit in addition to the detection state switching unit 11a. A non-detection switching setting unit 11b is provided.

  The detection condition switching unit 11c performs each repetition time in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device 20A when the particle separation device 20A is driven in the intermittent drive mode. Among these, the detection state in which the sensor 1 detects particles and the non-detection state in which the sensor 1 does not detect particles are switched once or more.

  In addition, the time division detection / non-detection switching setting unit 11b of the detection state switching unit 11a causes the sensor 1 to detect particles during each repetition time in the continuous repetition of the first voltage driving state and the second voltage driving state. Switching between a detection state in which the sensor 1 is detected and a non-detection state in which the sensor 1 does not detect particles is performed one or more times.

  In the particle measuring apparatus 10C and the particle separation method provided with the particle separation apparatus 20C having the above-described configuration, the drive control unit 22 performs the first input from the power supply unit 21 to the fan 4 during normal driving as in the first embodiment. Control is performed so as to supply the voltage VH0. Thereby, the fan 4 continues the first voltage driving state at the driving output P1. As a result, the sensor 1 can detect the fine particles 8b.

  On the other hand, in the intermittent drive mode, for example, by switching the input voltage between the first input voltage VH0 = rated voltage and the second input voltage VL0 (= zero voltage) at a constant interval, the fan 4 is brought into a non-driven state. Switch to driving state. Thereby, particle separation is performed while changing the drive output of the fan 4 between the drive outputs PL0 to PH0 and the drive outputs PH0 to PL0.

  In this intermittent drive mode, particle measurement is performed as follows.

  A particle measuring device 10C having the particle separation device 20C having the above-described configuration and a particle measuring method in the intermittent drive mode in the particle separating method will be described with reference to FIG. FIG. 8B is a timing chart showing the detection timing of the sensor 1 in the intermittent drive mode.

  In the particle measuring apparatus 10C and the particle separating method provided with the particle separating apparatus 20C of the present embodiment, as shown in FIGS. 8A and 8B, the detection / non-detection of particles according to the drive output of the fan 4 Can be switched.

  That is, as shown in FIGS. 7 and 8 (a) and 8 (b), for example, below the driving output P1 of the fan 4, the coarse particles 8a existing in the measurement environment are hardly sized and are passed through the branch flow path 5c. The sensor 1 is reached through. Therefore, detection is performed only when the drive output P1 of the fan 4 is equal to or lower. This makes it possible to perform particle detection / measurement in the all particle mode with respect to the surrounding environment.

  In the entire time of the intermittent drive mode, the detection presence / absence is switched by the detection condition switching unit 11c of the detection control unit 11, for example, the drive outputs PL0 to P1, the drive outputs P2 to PH0, and the drive outputs P1 to P1 of the fan 4. Detect at PL0. Further, it is not detected by the drive outputs P1 to P2 of the fan 4. As described above, there may be a plurality of detection / non-detection switching criteria. In FIGS. 8A and 8B, one driving / non-driving state cycle is divided into five, but the presence / absence of detection may be switched more finely. The switching timing may be based on the measured value of the driving output of the fan 4 and the measured value or the elapsed time from the time when the driving / non-driving state is switched.

  As described above, in this embodiment, the measurement timing is controlled in accordance with the rise and fall timings of the drive output of the fan 4.

  That is, in the particle measuring apparatus 10C of the present embodiment, in the all particle measurement mode in which the coarse particles 8a and the fine particles 8b are detected without being separated, the coarse particles 8a flow in at a timing sufficient for measurement. What is necessary is just to detect. Therefore, for example, the object can also be achieved by measuring a value obtained by integrating the particle detection information at all timings without dividing one peak portion of the output waveform shown in FIGS. Can do.

  However, the inflow amount of the coarse particles 8a is not constant at all timings. That is, the inflow amount of the coarse particles 8a is large at the timing of the rise when the flow velocity is relatively low and the fall of the drive output. However, since the inflow amount of the coarse particles 8a is small at the timing when the flow velocity is high, the ratio of the fine particles 8b included in all the particles is high. For this reason, in order to improve the detection accuracy of the particles to be detected, it is preferable to control the detection timing so that the detection is performed at a timing when the inflow amount or the inflow ratio of the detection target particles increases.

  Further, as a secondary effect, by performing the above-described control, it is possible to simultaneously perform the whole particle measurement mode and the minute particle measurement mode in the intermittent drive mode. That is, the measurement of the total particle measurement mode is performed at the timing of the drive outputs PL0 to P1 of the fan 4, and the fine particle measurement mode is performed at the timing of the drive outputs P2 to PH0 of the fan 4. This makes it possible to simultaneously measure the whole particle measurement mode and the fine particle measurement mode in real time.

  As described above, the particle measuring apparatus 10C according to the present embodiment includes the particle separating apparatus 20C and the sensor 1 that detects particles contained in the gas separated by the particle separating apparatus 20C. And in each repetition time in continuous repetition with the 1st voltage drive state and the 2nd voltage drive state of particle separation device 20C when particle separation device 20C drives in intermittent drive mode, a plurality of times A detection condition switching unit 11c that switches the detection condition to cause the sensor 1 to detect particles is provided.

  That is, the magnitude of the driving output of the fan 4 in the driving operation in the intermittent driving mode exists from a small driving output to a high driving output. For this reason, the size of the particles detected by the sensor 1 can be changed depending on whether the fan 4 has a small drive output or a high drive output.

  Therefore, the detection condition switching unit 11c performs each repetition in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device 20C when the particle separation device 20C is driven in the intermittent drive mode. During the time, the detection condition is switched at least once between a plurality of different detection conditions, and the particles are detected by the sensor 1 under the plurality of different detection conditions.

  This makes it possible to measure the amount of particles having various particle sizes according to a plurality of detection conditions corresponding to the drive output of the fan 4.

  In the particle measuring apparatus 10C according to the present embodiment, the detection state switching unit 11a includes the first voltage driving state and the second voltage driving of the particle separating apparatus 20C when the particle separating apparatus 20C is driven in the intermittent driving mode. Each repetition time in continuous repetition with the state is divided into a plurality of time regions, and switching between the detection state and the non-detection state is performed in the time division detection / non-detection switching setting unit 11b for each of the divided time regions. Do it.

  That is, the drive output of the fan 4 in the drive operation in the intermittent drive mode increases from a small drive output to a high drive output when the first voltage is applied. On the other hand, when the second voltage is applied, the drive voltage decreases from a high drive output to a low drive output. As a result, by dividing the time by time, the drive output of the fluid drive unit differs for each divided time region.

  Therefore, the detection state switching unit 11a performs each repetition time in continuous repetition between the first voltage driving state and the second voltage driving state of the particle separation device 20C when the particle separation device 20C is driven in the intermittent drive mode. Is divided into a plurality of time regions, and the detection state and the non-detection state are switched for each of the divided time regions. Thereby, the particle diameter can be detected only in a desired time region.

  Therefore, it is possible to measure the amount of particles in the range of the particle diameter corresponding to the drive output of the fluid drive unit in a desired time region.

[Embodiment 4]
The following will describe still another embodiment of the present invention with reference to FIGS. The configurations other than those described in the present embodiment are the same as those in the first to third embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 3 are given the same reference numerals, and descriptions thereof are omitted.

  In the third embodiment, one variation of the measurement method for the fine particles 8b and all the particles in the intermittent drive mode has been described.

  In the present embodiment, another variation of the measurement method for the fine particles 8b and all particles in the intermittent drive mode will be described.

  The configuration and operation of the particle measuring apparatus 10D provided with the particle separation apparatus 20D of the present embodiment will be described with reference to FIGS. 9 and 10A. FIG. 9 is a cross-sectional view showing a configuration of a particle measuring apparatus 10D including the particle separating apparatus 20D in the present embodiment. FIG. 10A shows a particle measuring apparatus 10D including the particle separation apparatus 20D according to the present embodiment, and is a waveform diagram showing a driving output of the fan 4 as a fluid driving unit in the intermittent driving mode. .

  In the particle measuring device 10D including the particle separation device 20D of the present embodiment, as shown in FIG. 9, the detection control unit 11 includes a detection state switching unit 11a, a time division detection / non-detection switching setting unit 11b, and In addition to the detection condition switching unit 11c, a time division particle detection setting unit 11d is provided.

  This time-division particle detection setting unit 11d repeats each repetition in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device 20D when the particle separation device 20D is driven in the intermittent drive mode. The time is divided into a plurality of time regions, and the sensor 1 is caused to detect particles under different detection conditions for each of the divided time regions.

  In the particle measuring apparatus 10D and the particle separation method provided with the particle separation apparatus 20D having the above-described configuration, the drive control unit 22 receives a first input from the power supply unit 21 to the fan 4 during normal driving, as in the first embodiment. Control is performed so as to supply the voltage VH0. Thereby, the fan 4 continues the first voltage driving state at the driving output P1. As a result, the sensor 1 can detect the fine particles 8b.

  On the other hand, in the intermittent drive mode, for example, by switching the input voltage between the first input voltage VH0 = rated voltage and the second input voltage VL0 (= zero voltage) at a constant interval, the fan 4 is brought into a non-driven state. Switch to driving state. Thereby, particle separation is performed while changing the drive output of the fan 4 between the drive outputs PL0 to PH0 and the drive outputs PH0 to PL0.

  In this intermittent drive mode, particle measurement is performed as follows.

  A particle measurement method in the intermittent drive mode in the particle measurement device 10D having the particle separation device 20D having the above-described configuration and the particle separation method will be described with reference to FIG. FIG. 10B is a timing chart showing a setting state of the time-division particle detection setting unit 11d that causes the particles to be detected for each divided time region in the intermittent drive mode.

  In the particle measuring apparatus 10D and the particle separating method provided with the particle separating apparatus 20D of the present embodiment, as shown in FIGS. 10A and 10B, the drive unit output of the fan 4 is divided for each divided time region. The measurement is performed while changing the measurement conditions according to the above.

  That is, when it is necessary to change the measurement conditions in accordance with the particle distribution to be measured, as shown in FIGS. 10 (a) and 10 (b), with respect to the particle range at the driving output PL0 to P1 of the fan 4. To switch to the measurement condition C1. Moreover, it switches to the measurement conditions C2 with respect to the particle | grain range at the time of the drive outputs P1-P2 of the fan 4. FIG. Furthermore, it switches to the measurement conditions C3 with respect to the particle | grain range at the time of the drive outputs P2-PH0 of the fan 4. As a result, it is possible to perform measurement under optimum conditions for a plurality of particle distributions.

  In this case, as shown in FIG. 11, if the particle measuring apparatus 10D is provided with the display device 30, the measurement results under the respective measurement conditions C1 to C3 can be displayed substantially simultaneously with the measurement. .

  Further, from the measurement result under each measurement condition C1 to C3, it is possible to perform processing such as taking the difference between the particle range under the measurement condition C1 and the particle range under the measurement condition C2. This makes it possible to obtain measurement results for particles in a range that cannot be separated by the particle separation device 20D.

  In FIGS. 10A and 10B, a cycle of one driving state and a non-driving state in the intermittent driving mode is divided into three measurement conditions C1 to C3. However, the measurement conditions are not necessarily limited to this, and the measurement conditions may be changed more finely. The measurement condition may be switched based on the value of the drive output of the fan 4 or may be switched based on the elapsed time from the switching time between the driving state and the non-driving state of the fan 4. Further, the measurement condition may have a specific value for each drive output range. Or you may calculate according to the drive output of the fan 4 at the time of a detection, may process in real time, and may process after a measurement.

  As described above, in the particle measuring apparatus 10D of the present embodiment, the detection condition switching unit 11c includes the first voltage driving state and the second state of the particle separating apparatus 20D when the particle separating apparatus 20D is driven in the intermittent drive mode. Each repetition time in the continuous repetition with the voltage drive state is divided into a plurality of time regions, and the particles are detected by the sensor 1 under different detection conditions for each of the divided time regions.

  That is, the drive output of the fan 4 in the drive operation in the intermittent drive mode increases from a small drive output to a high drive output when the first voltage is applied. On the other hand, when the second voltage is applied, the drive voltage decreases from a high drive output to a low drive output. As a result, the drive output of the fan 4 differs for each divided time region by time-sharing the time.

  Accordingly, the time-division particle detection setting unit 11d of the detection condition switching unit 11c causes the sensor 1 to detect particles under different detection conditions for each divided time region, thereby driving the fan 4 drive output in each time region. It is possible to measure the amount of particles in the range of different particle sizes corresponding to.

[Embodiment 5]
The following will describe still another embodiment of the present invention with reference to FIG. Configurations other than those described in the present embodiment are the same as those in the first to fourth embodiments. For convenience of explanation, members having the same functions as those shown in the drawings of Embodiments 1 to 4 are given the same reference numerals, and descriptions thereof are omitted.

  In the particle separation devices 20A and 20B, the particle measurement devices 10A and 10B, and the particle separation method according to the first embodiment and the second embodiment, the first voltage driven state by the first voltage and the second voltage lower than the first voltage. The intermittent drive mode in which the second voltage drive state by voltage is repeated has been described.

  In the present embodiment, a combination of the intermittent drive mode and the continuous drive mode will be described.

  Operation | movement of the particle | grain measuring apparatus 10E provided with the particle | grain separation apparatus 20E of this Embodiment is demonstrated based on FIG. FIG. 12 shows a particle measuring apparatus 10E provided with the particle separation apparatus 20E and a particle separation method in the present embodiment, and is used as a fluid drive unit in the case of switching between the intermittent drive mode and the continuous drive mode. It is a wave form diagram which shows the drive output of a fan.

  In the particle measuring apparatus 10E provided with the particle separation apparatus 20E of the present embodiment, as shown in FIG. 12, the intermittent drive mode and the continuous drive mode that is the normal drive are switched at regular intervals.

  Here, the continuous drive mode refers to continuing the first voltage drive state without shifting to the second voltage drive state after the first voltage drive state, and is a normal for measuring the microparticles 8b. Refers to drive mode.

  In the present embodiment, the switching interval can be changed depending on the measurement conditions. For example, in an environment where the variation of the fine particle concentration is large but the variation of the coarse particle concentration is small, the time of the normal drive, that is, the continuous drive mode is set longer than the time of the intermittent drive mode. This enables measurement with an emphasis on fine particle concentrations with large fluctuations.

  Thus, in the particle measuring apparatus 10E provided with the particle separation apparatus 20E of the present embodiment and the particle separation method, the drive control unit 22 is in the second voltage drive state after the intermittent drive mode and the first voltage drive state. Control is performed so as to switch to the continuous drive mode in which the first voltage drive state is continued without shifting to step (1).

  Thereby, in the intermittent drive mode, particle separation for performing particle measurement in the all particle measurement mode becomes possible. On the other hand, in the continuous drive mode, particle separation for performing particle measurement in the fine particle measurement mode is possible.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention.

  For example, in the present embodiment, when the drive control unit 22 switches between the intermittent drive mode and the continuous drive mode, it is possible to switch based on the following method.

  For example, in the particle separation device 20C and the particle measurement device 10C of the third embodiment and the particle separation device 20D and the particle measurement device 10D of the fourth embodiment, the intermittent drive mode and the continuous drive mode are switched based on the measurement result. It is possible.

  For example, in the measurement of the fine particle concentration in the atmosphere in the continuous drive mode, when the concentration of the fine particles 8b becomes a certain level or more, the mode is switched to the intermittent drive mode for a certain time.

  This makes it possible to analyze whether only the fine particle concentration has changed or whether the entire particle concentration in the atmosphere has changed. Here, the standard of switching is, for example, when the particle concentration is above or below a certain level, when a specific component is detected, or when the change rate of the measured value is above a certain value or below a certain value It is possible.

[Embodiment 6]
The following will describe still another embodiment of the present invention. The configurations other than those described in the present embodiment are the same as those in the first to fifth embodiments.

  For example, in the particle separation device 20C and the particle measurement device 10C of the third embodiment, and the particle separation device 20D and the particle measurement device 10D of the fourth embodiment, the amount of coarse particles 8a and It is possible to individually determine the amount of the fine particles 8b.

  That is, in principle, the amount of coarse particles 8a can be determined by subtracting the detection amount in the fine particle measurement mode from the detection amount of all particles detected in the total particle measurement mode. Further, the measurement result can be displayed on the display device 30 as shown in FIG.

  Even when the amount of coarse particles 8a and the amount of fine particles 8b are obtained individually, switching between the continuous drive mode and the intermittent drive mode described in the fifth embodiment may be performed. In this case, the measurement is performed in the continuous drive mode in the fine particle measurement mode, and the intermittent drive mode is set in the all particle measurement mode. In addition, switching between the continuous drive mode and the intermittent drive mode includes, for example, switching by a manual switch or switching by a timer.

[Summary]
The particle separation device 20A according to the first aspect of the present invention supplies a fluid drive unit (fan 4) that generates an air flow that introduces gas from the outside, and electric power for the fluid drive unit (fan 4) to generate a drive output. And a power supply unit 21 that separates particles contained in the introduced gas by its inertial force from the power supply unit 21 to the fluid drive unit (fan 4). A first voltage driving state in which one input voltage VH0) is applied, and a second voltage lower than the first voltage (first input voltage VH0) from the power supply unit 21 to the fluid driving unit (fan 4). A drive control unit 22 for driving the fluid drive unit (fan 4) in an intermittent drive mode that continuously repeats the second voltage drive state to which the second input voltage VL0) is applied is provided. As That.

  In the particle separation method according to the aspect 8 of the present invention, the fluid drive unit (fan 4) that generates an air flow for introducing gas from the outside generates a drive output from the power supply unit 21 to the fluid drive unit (fan 4). In the particle separation method of supplying particles of power and separating particles contained in the introduced gas by their inertial force, a first voltage (first input voltage) is supplied from the power supply unit 21 to the fluid drive unit (fan 4). And a second voltage (second input) lower than the first voltage (first input voltage VH0) from the power supply unit 21 to the fluid drive unit (fan 4). The fluid drive unit (fan 4) is driven in an intermittent drive mode that continuously repeats the second voltage drive state to which the voltage VL0) is applied.

  Conventionally, there has been no particle measurement apparatus that employs a particle separation apparatus and a particle separation method that enable both a fine particle measurement mode and a coarse particle measurement mode with a single detector.

  Here, in order to have the function of the normal whole particle measurement mode, there is a method of continuously rotating a fluid drive unit such as a fan at a low speed. Thereby, the inertial force of the coarse particles is changed, and the function of the whole particle measurement mode can be realized by using one detector. However, this method has the following problems.

  That is, there are generally two methods for reducing the speed of a fluid drive unit such as a fan, a voltage control method and a PWM (Pulse Width Modulation) control method.

  The voltage control method is a method for reducing the rotational speed of a fluid drive unit such as a fan by reducing the voltage supplied to the fluid drive unit such as a fan. However, in general, the range of output voltage in which a fluid drive unit such as a fan can operate is limited. For this reason, when a voltage falls largely compared with a low voltage, fluid drive parts, such as a fan, do not drive. That is, in the voltage control method, the range in which the rotational speed of the fluid drive unit such as a fan can be controlled is extremely limited. Further, when the voltage is controlled using a variable resistor or the like, power loss is caused by lowering the voltage.

  On the other hand, the PWM control method is a method for controlling the rotational speed of a fluid drive unit such as a fan by controlling the duty ratio of a pulse wave supplied to the fluid drive unit such as a fan. This method can control the rotational speed of a fluid drive unit such as a fan in a wider range than the voltage control method, and can reduce voltage loss. However, the PWM control controls the pulse wave with a cycle as short as the rotation cycle of a fluid drive unit such as a fan. For this reason, since it is necessary to mount a complicated circuit, cost becomes high.

  Therefore, in the particle separation device of the present invention, the first voltage drive state in which the first voltage is applied from the power supply unit to the fluid drive unit, and the second voltage lower than the first voltage from the power supply unit to the fluid drive unit. There is provided a drive control unit that drives the fluid drive unit in an intermittent drive mode that continuously repeats the second voltage drive state to which is applied.

  In the particle separation method of the present invention, the first voltage driving state in which the first voltage is applied from the power supply unit to the fluid driving unit, and the first voltage from the power supply unit to the fluid driving unit is lower than the first voltage. The fluid drive unit is driven in an intermittent drive mode in which the second voltage drive state in which the second voltage is applied is repeated.

  As a result, as the power supply from the power supply unit to the fluid drive unit, the high voltage first voltage and the low voltage second voltage are repeated periodically and continuously. As a result, immediately after application of the first voltage or immediately after switching the first voltage to the second voltage, the fluid drive unit takes time to drive at a lower output than the normal drive according to the rating. And during that time, coarse particles to be sized can reach the particle detector.

  As a result, in the present invention, since a drive circuit unit for changing output or a PWM drive circuit is not necessary, coarse particles can be measured even with a low-cost drive control unit.

  Therefore, it is possible to provide a particle separation device and a particle separation method that can easily change the particle classification range.

  The particle separation device 20A according to aspect 2 of the present invention is the particle separation device according to aspect 1, in which the second voltage (second input voltage VL1) is electric power from the power supply unit 21 to the fluid drive unit (fan 4). Can be assumed to be a zero voltage that is not supplied.

  As a result, the drive control unit only needs to turn on and off the first voltage applied from the power supply unit, so that the control in the drive control unit is simplified.

  The particle separation device 20E according to the third aspect of the present invention is the particle separation device 20A according to the first or second aspect, in which the drive control unit 22 is in the second voltage driving state after the intermittent driving mode and the first voltage driving state. It can be controlled to switch to the continuous drive mode in which the first voltage drive state is continued without shifting.

  Thereby, in the intermittent drive mode, particle separation for performing particle measurement in the all particle measurement mode becomes possible. On the other hand, in the continuous drive mode, particle separation for performing particle measurement in the fine particle measurement mode is possible.

  A particle measuring apparatus 10C according to Aspect 4 of the present invention includes a particle separator 20A / 20E according to Aspect 1, 2 or 3, and a particle detector that detects particles contained in the gas separated by the particle separator 20A / 20E. (Sensor 1), a first voltage drive state and a second voltage drive of the particle separators 20A and 20E when the particle separators 20A and 20E are driven in an intermittent drive mode. A detection state in which particles are detected by the particle detection unit (sensor 1) and a non-detection state in which particles are not detected by the particle detection unit (sensor 1) in each repetition time in continuous repetition with the state. It can be assumed that the detection state switching unit 11a that performs switching once or more is provided.

  That is, the drive output of the fluid drive unit in the drive operation in the intermittent drive mode increases from a small drive output to a high drive output when the first voltage is applied. On the other hand, when the second voltage is applied, the drive voltage decreases from a high drive output to a low drive output. Thus, the drive output of the fluid drive unit is different in the intermittent drive mode.

  Therefore, the detection state switching unit is configured to detect the particle detection unit with the particle detection unit in each repetition time in the continuous repetition of the first voltage driving state and the second voltage driving state, and the particle detection unit. Switching to the non-detection state where no particles are detected is performed once or more.

  This makes it possible to measure the amount of particles in a particle diameter range corresponding to the drive output of the fluid drive unit in a detection state in which the particle detection unit (sensor 1) detects particles.

  The particle measurement apparatus 10C according to the fifth aspect of the present invention detects particles contained in the gas separated by the particle separation apparatuses 20A, 20C, and 20E according to the first, second, and third aspects, and the particle separation apparatuses 20A, 20C, and 20E. The particle measuring apparatus includes a particle detecting unit (sensor 1) that performs the first voltage drive of the particle separators 20A, 20C, and 20E when the particle separators 20A and 20E are driven in the intermittent drive mode. The particle detection is performed under a plurality of different detection conditions by switching the detection condition one or more times between a plurality of different detection conditions in each repetition time in the continuous repetition of the state and the second voltage driving state. It can be assumed that a detection condition switching unit 11c that causes the unit (sensor 1) to detect particles is provided. The detection conditions include, for example, a conversion formula for converting the output value of the particle detection unit into a mass concentration in the case of an apparatus that measures the mass concentration of atmospheric particles using light scattering. Even at the same mass concentration, the light scattering intensity changes if the particle distribution is different. For this reason, highly accurate measurement is attained by switching the conversion formula according to the state of the intermittent drive mode. For example, in a particle detection device that detects particle detection information as an electrical signal and calculates the concentration of the particle using a product of the detected electrical signal intensity and a coefficient as a conversion formula, the magnitude of the drive output of the fluid drive unit (fan 4) Different coefficient values may be used corresponding to different particle ranges.

  That is, the magnitude of the drive output of the fluid drive unit in the drive operation in the intermittent drive mode ranges from a small drive output to a high drive output. For this reason, the particle | grain size which a particle | grain detection part detects can be changed with the case where a fluid drive part is a small drive output, and the case where it is a high drive output.

  Therefore, the detection condition switching unit is configured to determine the time of each repetition in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode. Among them, the detection condition is switched at least once between a plurality of different detection conditions, and the particles are detected by the particle detection unit under a plurality of different detection conditions.

  This makes it possible to measure the amount of particles having various particle sizes according to a plurality of detection conditions corresponding to the drive output of the fluid drive unit.

  The particle measuring apparatus 10C according to the sixth aspect of the present invention is the particle measuring apparatus according to the fourth aspect, wherein the detection state switching unit 11a is configured such that the particle separating apparatus 20C operates when the particle separating apparatus 20C is driven in the intermittent drive mode. When each repetition time in the continuous repetition of the one voltage driving state and the second voltage driving state is divided into a plurality of time regions, and switching between the detection state and the non-detection state is performed for each of the divided time regions. can do.

  That is, the drive output of the fluid drive unit in the drive operation in the intermittent drive mode increases from a small drive output to a high drive output when the first voltage is applied. On the other hand, when the second voltage is applied, the drive voltage decreases from a high drive output to a low drive output. As a result, by dividing the time by time, the drive output of the fluid drive unit differs for each divided time region.

  Therefore, the detection state switching unit sets a plurality of repetition times in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode. And the detection state and the non-detection state are switched for each of the divided time regions. Thereby, the particle diameter can be detected only in a desired time region.

  Therefore, it is possible to measure the amount of particles in the range of the particle diameter corresponding to the drive output of the fluid drive unit in a desired time region.

  The particle measuring apparatus 10D according to the seventh aspect of the present invention is the particle measuring apparatus according to the fifth aspect, wherein the detection condition switching unit 11c is configured so that the particle separating apparatus 20D operates when the particle separating apparatus 20D is driven in the intermittent drive mode. Each repetition time in the continuous repetition of the one voltage driving state and the second voltage driving state is divided into a plurality of time regions, and the particle detector (sensor 1) is detected under different detection conditions for each of the divided time regions. ) To detect particles.

  That is, the drive output of the fluid drive unit in the drive operation in the intermittent drive mode increases from a small drive output to a high drive output when the first voltage is applied. On the other hand, when the second voltage is applied, the drive voltage decreases from a high drive output to a low drive output. As a result, by dividing the time by time, the drive output of the fluid drive unit differs for each divided time region.

  Therefore, the detection condition switching unit causes the particle detection unit to detect particles under different detection conditions for each of the divided time regions, so that different particle diameters corresponding to the driving output of the fluid driving unit in each time region are obtained. It becomes possible to measure the amount of particles in the range.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the technical means disclosed in different embodiments can be appropriately combined. Such embodiments are also included in the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a fine particle measuring apparatus and a fine particle sensor that separate fine particles floating in the atmosphere and measure the amount of the separated fine particles. Therefore, for example, it can be applied to measurement of fine particles such as PM2.5 (Particulate Matter) and coarse particles such as dust.

DESCRIPTION OF SYMBOLS 1 Sensor 2 Air intake part 3 Parting part 4 Fan (fluid drive part)
5a Introducing flow path 5b Main flow path 5c Branch flow path 5d Main flow discharge path 5e Branch flow discharge path 6 Partition plate 7a Air flow 7b Main flow 7c Branch flow 8a Coarse particles 8b Fine particles 10A to 10E Particle measurement device 10A 'Particle measurement device 11 Detection control unit 11a Detection State switching unit 11b Time division detection / non-detection switching setting unit 11c Detection condition switching unit 11d Time division particle detection setting units 20A to 20E Particle separation device 20A 'Particle separation device 21 Power supply unit 22 Drive control unit 30 Display device A Branching unit C1 to C3 Measurement conditions PH0 Drive output PH1 Drive output PL0 Drive output PL1 Drive output P1, P2 Drive output VH0 First input voltage (first voltage)
VH1 first input voltage (first voltage)
VL0 Second input voltage (second voltage)
VL1 Second input voltage (second voltage)

Claims (8)

A fluid drive unit that generates an air flow that introduces gas from the outside, and a power supply unit that supplies power for the fluid drive unit to generate a drive output, and the inertia of particles contained in the introduced gas In a particle separator that separates by force,
A first voltage drive state in which a first voltage is applied from the power supply unit to the fluid drive unit, and a second voltage lower than the first voltage is applied from the power supply unit to the fluid drive unit. A particle separation device, comprising: a drive control unit that drives the fluid drive unit in an intermittent drive mode that continuously repeats the second voltage drive state.   2. The particle separator according to claim 1, wherein the second voltage is a zero voltage that does not supply power from the power supply unit to the fluid drive unit.   The drive control unit performs control to switch between the intermittent drive mode and a continuous drive mode in which the first voltage drive state is continued without shifting to the second voltage drive state after the first voltage drive state. The particle separator according to claim 1 or 2, characterized in that: A particle separator according to claim 1, 2 or 3,
A particle measuring device comprising a particle detector for detecting particles contained in the gas separated by the particle separator,
In each repetition time in the continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode, A particle measuring apparatus comprising a detection state switching unit that switches between a detection state in which particles are detected and a non-detection state in which particles are not detected by the particle detection unit at least once. A particle separator according to claim 1, 2 or 3,
A particle measuring device comprising a particle detector for detecting particles contained in the gas separated by the particle separator,
A plurality of different detection conditions in each repetition time in continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode. A particle measuring apparatus comprising: a detection condition switching unit that switches the detection condition between at least once and causes the particle detection unit to detect particles under a plurality of different detection conditions. The detection state switching unit
Dividing each repetition time in continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode into a plurality of time regions; 5. The particle measuring apparatus according to claim 4, wherein switching between the detection state and the non-detection state is performed for each of the divided time regions. The detection condition switching unit
Dividing each repetition time in continuous repetition of the first voltage driving state and the second voltage driving state of the particle separation device when the particle separation device is driven in the intermittent drive mode into a plurality of time regions; The particle measuring apparatus according to claim 5, wherein the particle detecting unit is configured to detect particles under different detection conditions for each of the divided time regions. Power is supplied from the power supply unit to the fluid drive unit that generates an air flow that introduces gas from the outside, and the fluid drive unit generates a drive output, and particles contained in the introduced gas are caused by its inertial force. In the particle separation method to separate,
A first voltage drive state in which a first voltage is applied from the power supply unit to the fluid drive unit, and a second voltage lower than the first voltage is applied from the power supply unit to the fluid drive unit. The fluid separation unit is driven in an intermittent drive mode that continuously repeats the second voltage drive state.