CN111974118B - Filter device - Google Patents
Filter device Download PDFInfo
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- CN111974118B CN111974118B CN202010381922.7A CN202010381922A CN111974118B CN 111974118 B CN111974118 B CN 111974118B CN 202010381922 A CN202010381922 A CN 202010381922A CN 111974118 B CN111974118 B CN 111974118B
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- compressed air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0041—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4236—Reducing noise or vibration emissions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/442—Auxiliary equipment or operation thereof controlling filtration by measuring the concentration of particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/46—Auxiliary equipment or operation thereof controlling filtration automatic
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The filter device includes a filter unit and a particle detector. The particle detector is provided in a supply flow path that supplies compressed air from an air supply source to the pneumatic device, and removes particles contained in the compressed air flowing through the supply flow path. The particle detector includes a detection flow path, an optical sensor, and a flow rate adjustment unit. The detection flow path is branched from a portion of the supply flow path on the downstream side of the filter unit in the flow direction of the compressed air, and is connected to the atmosphere. The optical sensor detects particles contained in the compressed air flowing through the detection flow path. The flow velocity adjusting unit adjusts the flow velocity of the compressed air flowing toward the optical sensor in the detection flow path to a predetermined flow velocity so as to be independent of the flow velocity of the compressed air flowing through the supply flow path.
Description
Technical Field
The present invention relates to a filter device.
Background
For example, a pneumatic machine used in a factory or the like is driven by compressed air supplied from an air supply source through a supply passage. Generally, a filter device having a filter unit (filter module) for removing particles contained in compressed air flowing through a supply flow path before the compressed air is supplied to a pneumatic machine is provided in the supply flow path. However, the filter portion is gradually clogged with the continuous use, and the ability to remove particles is reduced. In this regard, for example, the device described in japanese patent application laid-open No. 2010-101702 can detect a difference between the pressure of the compressed air before passing through the filter unit and the pressure of the compressed air after passing through the filter unit. Further, the larger the pressure difference is, the more the filter portion can be judged to be in the clogged state. In addition, the filter unit that has become clogged is replaced with a new filter unit by an operator.
However, in the device disclosed in jp 2010-101702 a, if the difference between the pressure of the compressed air before passing through the filter unit and the pressure of the compressed air after passing through the filter unit is not large to a certain extent, it is impossible to determine that the filter unit is in a clogged state. Therefore, there is a problem that the optimum timing for replacing the filter unit is not known, and thus the security cannot be prevented.
Disclosure of Invention
Problems to be solved by the invention
The invention aims to provide a filter device which can continuously and accurately detect particles contained in compressed air, thereby reliably preventing and preserving a filter part.
Means for solving the problems
In order to achieve the above object, a filter device includes a filter unit that is provided in a supply flow path for supplying compressed air from an air supply source to a pneumatic machine and that removes particles contained in the compressed air flowing through the supply flow path. The filter device is provided with a particle detector. The particle detector includes a detection flow path that branches from a portion of the supply flow path that is on a downstream side in a flow direction of the compressed air relative to the filter unit and is connected to the atmosphere, an optical sensor that detects particles included in the compressed air flowing through the detection flow path, and a flow rate adjustment unit that adjusts a flow rate of the compressed air flowing through the detection flow path toward the optical sensor to a predetermined flow rate so as to be independent of the flow rate of the compressed air flowing through the supply flow path.
In the above filter device, it is preferable that: the flow rate adjusting part comprises a 1 st fixed orifice, a 2 nd fixed orifice, a branch flow path and a safety valve, the 1 st fixed orifice is provided upstream of the optical sensor in the flow direction of the compressed air in the detection flow path, the 2 nd fixed orifice is provided in the detection flow path between the 1 st fixed orifice and the optical sensor, and has a flow path area smaller than that of the 1 st fixed orifice, a branch flow path that branches from a portion of the detection flow path between the 1 st and 2 nd fixed orifices and is connected to the atmosphere, the safety valve is provided in the branch flow passage and opens when a pressure in a portion between the 1 st fixed orifice and the 2 nd fixed orifice in the detection flow passage is higher than a predetermined pressure set in advance, when the safety valve is opened, the flow passage area of the 1 st fixed orifice is smaller than the flow passage area of the safety valve.
In the above filter device, it is preferable that: a downstream end of the branch flow path in the flow direction of the compressed air is connected to a portion of the detection flow path on a downstream side of the optical sensor in the flow direction of the compressed air, and is connected to the atmosphere via the detection flow path, and a check valve that blocks a flow of the compressed air flowing into the detection flow path from the downstream end of the branch flow path toward the optical sensor is provided between the optical sensor and a connection portion with the downstream end of the branch flow path in the detection flow path.
In the above filter device, it is preferable that: the flow rate adjusting portion includes a variable orifice provided on an upstream side in a flow direction of the compressed air with respect to the optical sensor in the detection flow path, and a variable orifice control portion that controls a degree of opening of the variable orifice in accordance with a pressure in a portion of the supply flow path on a downstream side in the flow direction of the compressed air with respect to the filter portion.
In the above filter device, it is preferable that: the particle detector further includes an electromagnetic valve provided at an end of the detection flow path adjacent to the supply flow path, and an electromagnetic valve control unit for controlling opening and closing of the electromagnetic valve, wherein the electromagnetic valve control unit opens the electromagnetic valve at a predetermined frequency.
In the above filter device, it is preferable that: the electromagnetic valve control unit closes the electromagnetic valve when the amount of particles detected by the optical sensor exceeds a predetermined amount set in advance.
In the above filter device, it is preferable that: the detection flow path is provided with a diffusion member that diffuses the compressed air flowing in the detection flow path.
In the above filter device, it is preferable that: the particle detector is attached to a main body that houses the filter unit, while being disposed outside the main body.
Effects of the invention
According to the present invention, it is possible to continuously and accurately detect particles contained in compressed air, and to reliably prevent and maintain the filter unit.
Drawings
Fig. 1 is a diagram illustrating a filter device according to an embodiment.
Fig. 2 is a diagram for explaining a filter device according to another embodiment.
Fig. 3 is a diagram for explaining another filter device according to another embodiment.
Detailed Description
Hereinafter, a first embodiment of the filter device will be described with reference to fig. 1.
As shown in fig. 1, the filter device 10 is provided in a supply passage 13, and the supply passage 13 supplies compressed air from an air supply source 11 to the pneumatic machine 12. The pneumatic machine 12 is driven by compressed air supplied from the air supply source 11 through the supply passage 13. The supply channel 13 is constituted by a pipe or the like, for example.
The filter device 10 has a body 14. The body 14 has a supply hole 14a and a discharge hole 14 b. The supply channel 13 has a 1 st channel 13a, a 2 nd channel 13b, and a 3 rd channel 13 c. The 1 st flow path 13a connects the air supply source 11 and the supply hole 14a to the outside of the main body 14. The 2 nd flow path 13b connects the supply port 14a and the discharge port 14b in the main body 14. The 3 rd flow path 13c connects the discharge port 14b and the pneumatic device 12 to the outside of the main body 14.
The filter device 10 has a filter portion 15. The filter unit 15 is housed in the main body 14. The filter unit 15 is provided in the 2 nd flow path 13b of the supply flow path 13. The filter unit 15 is, for example, a cylindrical filter member. The filter unit 15 removes particles contained in the compressed air flowing through the 2 nd flow path 13b in the supply flow path 13 before the compressed air is supplied to the pneumatic machine 12. The filter unit 15 captures particles contained in the compressed air passing through the filter unit 15.
The filter device 10 includes a particle detector 20. In the present embodiment, the particle detector 20 is built in the main body 14 of the filter device 10. The particle detector 20 has a detection flow path 21. The detection flow path 21 is constituted by, for example, a pipe. The detection flow path 21 branches from a portion of the 2 nd flow path 13b of the supply flow path 13 on the downstream side of the filter unit 15 in the flow direction of the compressed air, and is connected to the atmosphere. Therefore, one end of the detection flow path 21 is connected to the 2 nd flow path 13b of the supply flow path 13, and the other end of the detection flow path 21 is opened to the atmosphere.
The particle detector 20 has an optical sensor 22. The optical sensor 22 detects particles contained in the compressed air flowing through the detection flow path 21. The optical sensor 22 has a light projecting and receiving part 22 a. The light receiving and projecting unit 22a is provided in the detection flow path 21. The light emitter/receiver 22a includes a light emitter and a light receiver, not shown. Further, the light receiving and projecting unit 22a is configured to: the light emitted from the light projecting section is irradiated to the compressed air flowing through the detection flow path 21, and the light reflected by the particles contained in the compressed air, that is, the scattered light is received by the light receiving section.
The optical sensor 22 detects particles contained in the compressed air flowing through the detection flow path 21 based on the light intensity level of the light received by the light receiving unit of the light receiving and projecting unit 22 a. For example, the optical sensor 22 has a controller 23, and an electronic signal based on the light amount level of light received by the light receiving portion is transmitted from the light receiving portion to the controller 23. The controller 23 detects the particle diameter, the number, and the like of the particles based on the signal intensity of the electronic signal transmitted from the light receiving unit.
The controller 23 is electrically connected to an external control device 24 such as a Programmable Logic Controller (PLC). Further, when the particle diameter of the particles detected by the controller 23 is larger than a predetermined particle diameter, or when the amount of the particles detected by the controller 23 exceeds a predetermined amount, the controller 23 transmits a signal related to information for informing an operator that the filter portion 15 needs to be replaced to the external control machine 24.
The external control device 24 is configured to: when a signal relating to information for notifying the operator that the filter unit 15 needs to be replaced is received, an indication is made that the operator needs to replace the filter unit 15. The external control device 24 has, for example, a display to indicate the need for replacement of the filter unit 15 to the operator.
The particle detector 20 includes a 1 st fixed orifice 25, a 2 nd fixed orifice 26, a branch flow passage 27, and a safety valve 28. The 1 st fixed orifice 25 is provided on the upstream side of the detection flow path 21 in the flow direction of the compressed air with respect to the light projecting and receiving portion 22a of the optical sensor 22. The 2 nd fixed orifice 26 is provided between the 1 st fixed orifice 25 and the light receiving and projecting portion 22a of the optical sensor 22 in the detection flow path 21. The flow passage area of the 2 nd stationary orifice 26 is smaller than that of the 1 st stationary orifice 25.
The branch flow passage 27 branches from a portion of the detection flow passage 21 between the 1 st and 2 nd fixed orifices 25 and 26. The branch flow path 27 is formed of, for example, a pipe. The downstream end of the branch flow path 27 in the flow direction of the compressed air is connected to a portion of the detection flow path 21 on the downstream side in the flow direction of the compressed air with respect to the light projecting and receiving portion 22a of the optical sensor 22. Therefore, the branch flow path 27 is connected to the atmosphere via the detection flow path 21.
The relief valve 28 is provided in the branch flow passage 27. The relief valve 28 is configured to: the valve opens when the pressure in the portion of the detection flow path 21 between the 1 st and 2 nd fixed orifices 25, 26 is higher than a predetermined pressure that is set in advance. The relief valve 28 is configured to: the flow passage area when the valve is opened is larger than the flow passage area of the 1 st fixed orifice 25. Therefore, the flow passage area of the 1 st fixed orifice 25 is smaller than the flow passage area of the relief valve 28 when the relief valve 28 is opened.
In the detection flow path 21, an inspection valve 29 is provided between the light receiving and projecting portion 22a of the optical sensor 22 and a connection portion connected to the downstream end of the branch flow path 27. The check valve 29 blocks the flow of the compressed air flowing into the detection flow path 21 from the downstream end of the branch flow path 27 toward the light projecting and receiving portion 22a of the optical sensor 22.
The particle detector 20 also has a solenoid valve 30. The electromagnetic valve 30 is provided at an end of the detection flow path 21 adjacent to the supply flow path 13. The solenoid valve 30 is provided between the 1 st fixed orifice 25 and a connection portion of the detection flow path 21 to the supply flow path 13. The solenoid valve 30 is electrically connected to the controller 23. The controller 23 stores the following programs in advance: the solenoid valve 30 is commanded to open when a command signal for commanding the solenoid valve 30 to open is received from the external control device 24.
The controller 23 receives a command signal from the external control device 24 to open the solenoid valve 30 by an operator pressing an execution button provided in the external control device 24, for example. The timing at which the operator presses the execution button of the external control device 24 is determined in advance in the work procedure of the operator. Therefore, in the present embodiment, the controller 23 opens the electromagnetic valve 30 at a predetermined frequency set in advance.
The controller 23 has a function of a timer. The controller 23 stores the following programs in advance: the measurement of the time is started while the electromagnetic valve 30 is opened, and the electromagnetic valve 30 is commanded to close after a predetermined time has elapsed. Therefore, the controller 23 opens the electromagnetic valve 30 only for a predetermined period set in advance. Further, the controller 23 stores the following programs in advance: the electromagnetic valve 30 is commanded to close when the amount of particles detected by the controller 23 exceeds a predetermined amount set in advance. Therefore, the controller 23 functions as a solenoid valve control unit that controls opening and closing of the solenoid valve 30.
The detection flow path 21 is provided with a diffusion member 31. The diffusion member 31 is provided between the 2 nd fixed orifice 26 and the light receiving and projecting portion 22a of the optical sensor 22 in the detection flow path 21. The diffusion member 31 is, for example, a thin plate-like porous metal plate having a plurality of holes formed therein. Inside the pipe constituting the detection flow path 21, the diffusion member 31 is disposed: the thickness direction of the diffusion member 31 coincides with the axial direction of the pipe. In addition, the compressed air flowing in the detection flow path 21 is diffused by passing through the plurality of holes of the diffusion member 31. Therefore, the diffusion member 31 diffuses the compressed air flowing in the detection flow path 21.
The end of the detection flow path 21 opposite to the supply flow path 13 protrudes from the main body 14. A silencer 32 is provided in a portion of the detection flow path 21 protruding from the main body 14. Therefore, the muffler 32 is provided at the end of the detection flow path 21 opposite to the supply flow path 13. The muffler 32 can suppress the exhaust sound of the compressed air when the compressed air is discharged from the detection flow path 21 to the atmosphere. The detection flow path 21 is provided with a filter 33 at an end opposite to the supply flow path 13. The filter 33 removes particles contained in the compressed air passing through the detection flow path 21. The filter 33 captures particles contained in the compressed air passing through the filter 33.
Next, the operation of the present embodiment will be described.
The compressed air supplied from the air supply source 11 to the supply passage 13 passes through the filter unit 15 when flowing through the supply passage 13. The filter unit 15 removes particles contained in the compressed air passing through the filter unit 15. The compressed air from which particles have been removed by the filter unit 15 is supplied to the pneumatic machine 12 through the supply passage 13.
When the operator presses an execution button of the external control device 24, a command signal for opening the solenoid valve 30 is transmitted from the external control device 24 to the controller 23, and the controller 23 opens the solenoid valve 30 by receiving the command signal from the external control device 24. The controller 23 starts time measurement while opening the electromagnetic valve 30.
The detection flow path 21 branches from a portion of the 2 nd flow path 13b of the supply flow path 13 on the downstream side of the filter unit 15 in the flow direction of the compressed air, and is connected to the atmosphere. Therefore, when the electromagnetic valve 30 is opened, a part of the compressed air flowing through the supply passage 13 continues to flow into the detection passage 21. Therefore, the flow of the compressed air from the supply flow path 13 continues to be generated in the detection flow path 21.
The compressed air flowing from the supply passage 13 into the detection passage 21 passes through the solenoid valve 30 and the 1 st fixed orifice 25, and then flows into the detection passage 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26. At this time, the flow passage area of the 2 nd fixed orifice 26 is smaller than that of the 1 st fixed orifice 25. When the pressure in the portion of the detection flow path 21 between the 1 st and 2 nd fixed orifices 25, 26 is higher than a predetermined pressure set in advance, the relief valve 28 opens.
Therefore, for example, when the pressure in the portion of the detection flow path 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 is higher than a predetermined pressure that is set in advance, a part of the compressed air that flows into the branch flow path 27 from the portion between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 passes through the relief valve 28. The compressed air having passed through the safety valve 28 passes through the branch flow path 27, flows into the detection flow path 21 on the downstream side in the flow direction of the compressed air with respect to the light receiving and projecting portion 22a of the optical sensor 22 through the downstream end of the branch flow path 27, and is discharged to the atmosphere through the detection flow path 21. However, the flow of the compressed air flowing into the detection flow path 21 from the downstream end of the branch flow path 27 toward the light receiving and projecting portion 22a of the optical sensor 22 is blocked by the check valve 29.
Further, by setting the flow passage area of the 1 st fixed orifice 25 to be smaller than the flow passage area of the relief valve 28 when the relief valve 28 is opened, the pressure in the portion of the detection flow passage 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 is maintained at a predetermined pressure or less lower than the pressure in the supply flow passage 13. Thereby, the flow velocity of the compressed air flowing into the light receiving portion 22a of the optical sensor 22 through the 2 nd fixed orifice 26 is adjusted to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13.
Therefore, the 1 st fixed orifice 25, the 2 nd fixed orifice 26, the branch flow passage 27, and the safety valve 28 constitute a flow velocity adjusting portion 35, and the flow velocity adjusting portion 35 adjusts the flow velocity of the compressed air flowing toward the optical sensor 22 in the detection flow passage 21 to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow passage 13. Therefore, the flow rate adjustment portion 35 of the present embodiment includes the 1 st fixed orifice 25, the 2 nd fixed orifice 26, the branch flow passage 27, and the relief valve 28.
The compressed air having passed through the 2 nd fixing flow hole 26 is diffused by the diffusion member 31 before flowing into the light receiving and projecting portion 22a of the optical sensor 22. In this way, the flow velocity of the compressed air flowing through the portion between the diffusion member 31 and the light receiving and projecting portion 22a of the optical sensor 22 in the pipe constituting the detection flow path 21 is made uniform.
The optical sensor 22 detects particles contained in the compressed air that has passed through the diffusion member 31 in the detection flow path 21. Specifically, the light emitted from the light emitter of the light receiver 22a is irradiated to the compressed air flowing through the detection flow path 21, and the light reflected by the particles contained in the compressed air, that is, the scattered light is received by the light receiver. At this time, the flow velocity of the compressed air flowing through the detection flow path 21 is adjusted to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13, and the flow velocity of the compressed air is made uniform in the pipe by the diffuser 31. Therefore, the light emitted from the light projecting section is accurately reflected by the particles, and the scattered light reflected by the particles is accurately received by the light receiving section.
Then, an electronic signal based on the light amount level of the light received by the light receiving portion is transmitted from the light receiving portion to the controller 23. The controller 23 detects the particle diameter, the number, and the like of the particles based on the signal intensity of the electronic signal transmitted from the light receiving unit.
When at least one of the particle diameter of the particles detected by the controller 23 is equal to or smaller than a predetermined particle diameter and the amount of the particles detected by the controller 23 is equal to or smaller than a predetermined amount, the controller 23 closes the electromagnetic valve 30 when a predetermined time has elapsed from the measurement of the timer.
On the other hand, when the particle diameter of the particles detected by the controller 23 is larger than the predetermined particle diameter or when the amount of the particles detected by the controller 23 exceeds the predetermined amount, the controller 23 transmits a signal of the relevant information to the external control device 24 to notify the operator that the filter unit 15 needs to be replaced. Then, the controller 23 closes the electromagnetic valve 30.
When a signal relating to information for informing an operator that the filter unit 15 needs to be replaced is received from the controller 23, the external control device 24 indicates the necessity of replacement of the filter unit 15 by a display.
The above embodiment can obtain the following effects.
(1) As described in the background art, the apparatus disclosed in jp 2010-101702 a has a problem that the optimum timing for replacing the filter unit is not known, and thus the security cannot be prevented.
In this regard, particles contained in the compressed air flowing through the supply flow path through the filter unit are detected using, for example, an optical sensor. In this way, as compared with the case where the clogging state of the filter unit is determined by detecting the difference between the pressure of the compressed air before passing through the filter unit and the pressure of the compressed air after passing through the filter unit as in the device disclosed in japanese patent application laid-open No. 2010-101702, the clogging state of the filter unit can be determined accurately, and preventive maintenance of the filter unit can be performed.
However, even if the optical sensor is used, if the flow of the compressed air is not generated in the supply flow path, the particles contained in the compressed air cannot be detected. Therefore, the particles contained in the compressed air can be continuously detected without using the optical sensor. Further, the flow rate of the compressed air flowing through the supply flow path depends on the usage state of the pneumatic machine. Therefore, when the flow velocity of the compressed air flowing through the supply flow path is too high, it is difficult to accurately detect the particles contained in the compressed air by the optical sensor, and therefore the clogging state of the filter unit cannot be accurately determined, and there is a possibility that the filter unit cannot be reliably protected.
According to the present embodiment, the detection flow path 21 branches off from the portion of the supply flow path 13 on the downstream side in the flow direction of the compressed air with respect to the filter unit 15, and is connected to the atmosphere. The particle detector 20 includes an optical sensor 22 for detecting particles contained in the compressed air flowing through the detection flow path 21, and a flow velocity adjusting unit 35 for adjusting the flow velocity of the compressed air flowing through the detection flow path 21 toward the optical sensor 22 to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13.
According to this configuration, since the detection flow path 21 is connected to the atmosphere, the flow of the compressed air from the supply flow path 13 is continuously generated in the detection flow path 21, and the optical sensor 22 can continuously detect particles contained in the compressed air flowing through the detection flow path 21. Further, since the flow velocity of the compressed air flowing toward the optical sensor 22 in the detection flow path 21 is adjusted to a predetermined flow velocity by the flow velocity adjusting portion 35 regardless of the flow velocity of the compressed air flowing in the supply flow path 13, particles contained in the compressed air flowing in the detection flow path 21 can be accurately detected. Therefore, the clogging state of the filter unit 15 can be accurately determined. As described above, the particles contained in the compressed air can be detected continuously and accurately, and the prevention and maintenance of the filter unit 15 can be reliably performed.
(2) The flow rate adjustment portion 35 includes the 1 st fixed orifice 25, the 2 nd fixed orifice 26, the branch flow passage 27, and the relief valve 28. In this way, when the pressure in the portion of the detection flow path 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 is higher than a predetermined pressure set in advance, the relief valve 28 opens. A part of the compressed air flowing into the branch flow path 27 from the portion between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 is discharged to the atmosphere through the relief valve 28. When the relief valve 28 is opened, the flow passage area of the 1 st fixed orifice 25 is smaller than the flow passage area of the relief valve 28.
In this way, the pressure in the portion of the detection flow path 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 can be maintained at a predetermined pressure or lower, which is lower than the pressure in the supply flow path 13, and the flow velocity of the compressed air flowing toward the optical sensor 22 through the 2 nd fixed orifice 26 can be adjusted to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13. Therefore, the flow velocity of the compressed air flowing toward the optical sensor 22 in the detection flow path 21 is adjusted to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13, and thus the control can be performed mechanically rather than electrically.
(3) The downstream end of the branch flow path 27 in the flow direction of the compressed air is connected to a portion of the detection flow path 21 on the downstream side of the optical sensor 22 in the flow direction of the compressed air, and is connected to the atmosphere via the detection flow path 21. Further, in the detection flow path 21, a check valve 29 is provided between the optical sensor 22 and a connection portion connected to the downstream end of the branch flow path 27, and the check valve 29 blocks a flow of the compressed air flowing into the detection flow path 21 from the downstream end of the branch flow path 27 toward the optical sensor 22. In this way, the compressed air flowing into the branch flow path 27 can be concentrated in the detection flow path 21 and discharged to the atmosphere, and therefore the flow path structure of the particle detector 20 can be simplified.
(4) The particle detector 20 further includes an electromagnetic valve 30, and the electromagnetic valve 30 is provided at an end of the detection flow path 21 adjacent to the supply flow path 13. The controller 23 controls opening and closing of the electromagnetic valve 30. The controller 23 opens the electromagnetic valve 30 at a predetermined frequency set in advance. In this way, the flow of the compressed air from the supply passage 13 can be continuously generated in the detection passage 21 only when the solenoid valve 30 is opened. Therefore, even when it is not necessary to detect particles contained in the compressed air, since a part of the compressed air flowing through the supply passage 13 does not flow into the detection passage 21, the compressed air can be efficiently supplied to the pneumatic device 12.
(5) When the amount of particles detected by the optical sensor 22 exceeds a predetermined amount set in advance, the controller 23 closes the electromagnetic valve 30. In this way, a part of the compressed air flowing through the supply passage 13 can be prevented from passing through the detection passage 21 and being discharged to the atmosphere. Therefore, the compressed air can be prevented from being discharged to the atmosphere via the detection flow path 21 in a state where the compressed air contains excessive particles.
(6) The detection flow path 21 is provided with a diffusion member 31, and the diffusion member 31 diffuses the compressed air flowing through the detection flow path 21. In this way, the flow velocity of the compressed air flowing through the detection flow path 21 is made uniform by the compressed air diffusing by the diffusion member 31. Therefore, the particles contained in the compressed air flowing through the detection flow path 21 can be detected more accurately by the optical sensor 22.
(7) A silencer 32 is provided at an end of the detection flow path 21 opposite to the supply flow path 13. In this way, the discharge noise of the compressed air when the compressed air is discharged from the detection flow path 21 to the atmosphere can be suppressed.
(8) The detection flow path 21 is provided with a filter 33 at an end opposite to the supply flow path 13. In this way, since the filter 33 captures particles contained in the compressed air passing through the filter 33, it is possible to suppress the particles from scattering into the atmosphere when the compressed air is discharged from the detection flow path 21 to the atmosphere.
(9) The pressure in the portion of the detection flow path 21 between the 1 st fixed orifice 25 and the 2 nd fixed orifice 26 is maintained at a predetermined pressure or lower which is lower than the pressure in the supply flow path 13. In this way, since the pressure of the compressed air flowing toward the optical sensor 22 in the detection flow path 21 is suppressed so as not to exceed the pressure to which the optical sensor 22 is subjected, the durability of the optical sensor 22 can be improved.
However, the above embodiment can be modified as follows. The above-described embodiments and the following modifications can be combined and implemented within a range that is not technically contradictory to each other.
As shown in fig. 2, the particle detector 20 may be configured to: the 1 st fixed orifice 25, the 2 nd fixed orifice 26, the branch flow path 27, and the safety valve 28 are not included, but a variable orifice 41 is provided in the detection flow path 21 upstream of the light receiving and projecting portion 22a of the optical sensor 22 in the flow direction of the compressed air.
The variable orifice 41 is electrically connected to the controller 23. The particle detector 20 further includes a pressure sensor 42, and the pressure sensor 42 detects a pressure in a portion of the supply flow path 13 on the downstream side in the flow direction of the compressed air with respect to the filter unit 15. The pressure sensor 42 is electrically connected to the controller 23. Information on the pressure detected by the pressure sensor 42 is transmitted to the controller 23. The controller 23 stores the following programs in advance: the degree of opening of the variable orifice 41 is controlled based on the information of the pressure transmitted from the pressure sensor 42. Therefore, the controller 23 functions as a variable orifice control unit, and controls the degree of opening of the variable orifice 41 in accordance with the pressure in the portion of the supply flow path 13 on the downstream side in the flow direction of the compressed air with respect to the filter unit 15.
Thereby, the flow velocity of the compressed air flowing through the variable orifice 41 in the detection flow path 21 toward the optical sensor 22 is adjusted to a predetermined flow velocity so as to be independent of the flow velocity of the compressed air flowing through the supply flow path 13. Therefore, the variable orifice 41, the pressure sensor 42, and the controller 23 constitute a flow velocity adjusting portion 45, and the flow velocity adjusting portion 45 adjusts the flow velocity of the compressed air flowing toward the optical sensor 22 in the detection flow path 21 to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path 13. Therefore, the flow rate adjustment unit 45 of the embodiment shown in fig. 2 includes the variable orifice 41 and the controller 23.
The controller 23 controls the degree of opening of the variable orifice 41 in accordance with the pressure in the portion of the supply flow path 13 on the downstream side in the flow direction of the compressed air relative to the filter unit 15, thereby adjusting the flow rate of the compressed air flowing toward the optical sensor 22 in the detection flow path 21. In this way, the flow velocity of the compressed air flowing toward the optical sensor 22 in the detection flow path 21 can be accurately adjusted to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing in the supply flow path 13. In the case of the embodiment shown in fig. 2, the optical sensor 22 needs to be configured to be able to withstand the pressure of the compressed air flowing toward the optical sensor 22 in the detection flow path 21. For example, the light projector/receiver 22a of the optical sensor 22 is preferably disposed outside the pipe constituting the detection flow path 21.
In the embodiment, the downstream end of the branch flow path 27 in the flow direction of the compressed air may be connected to the atmosphere separately from the detection flow path 21, and may not be connected to the portion of the detection flow path 21 on the downstream side in the flow direction of the compressed air with respect to the optical sensor 22. In this case, the muffler 32 and the filter 33 may be provided at the downstream end of the branch flow passage 27 in the same manner as the detection flow passage 21.
In the embodiment, the following configuration may be adopted: no check valve 29 is provided in the detection flow path 21 between the optical sensor 22 and the connection portion connected to the downstream end of the branch flow path 27, and the check valve 29 blocks the flow of the compressed air flowing into the detection flow path 21 from the downstream end of the branch flow path 27 toward the optical sensor 22.
In the embodiment, the controller 23 receives a command signal for commanding the opening of the solenoid valve 30 from the external control device 24 by an operator pressing an execution button provided in the external control device 24, for example, but the invention is not limited thereto. For example, a command signal for commanding the opening of the electromagnetic valve 30 may be automatically transmitted from the external control device 24 to the controller 23 at a predetermined timing.
In the embodiment, the controller 23 may not close the electromagnetic valve 30 even when the amount of particles detected by the optical sensor 22 exceeds a predetermined amount set in advance.
In the embodiment, for example, a part of the gap of the solenoid valve 30 can function as the 1 st fixed orifice 25. In this way, it is not necessary to add the 1 st fixed orifice 25 to the detection flow path 21 in addition to the solenoid valve 30, and the configuration can be simplified.
In the embodiment, the particle detector 20 may not have the solenoid valve 30.
In the embodiment, the diffusion member 31 may be a thin-plate-shaped metal mesh, for example.
In the embodiment, the diffusion member 31 for diffusing the compressed air flowing through the detection flow path 21 may not be provided in the detection flow path 21.
In the embodiment, the silencer 32 may not be provided at the end of the detection flow path 21 opposite to the supply flow path 13.
In the embodiment, the filter 33 may not be provided at the end of the detection flow path 21 opposite to the supply flow path 13.
As shown in fig. 3, the particle detector 20 may not be built in the main body 14 of the filter device 10, but may be disposed, for example, in parallel with the main body 14 of the filter device 10. At this time, the particle detector 20 is disposed between the main body 14 of the filter device 10 and the pneumatic machine 12, and a portion of the supply flow path 13 on the downstream side in the flow direction of the compressed air with respect to the filter unit 15 penetrates the particle detector 20. The particle detector 20 is attached to the main body 14 in a state of being disposed outside the main body 14. In this way, the particle detector 20 can be easily post-mounted to the body 14. In addition, since the particle detector 20 can also be easily detached from the main body 14, maintenance can be easily performed.
In the embodiment, the optical sensor 22 may be configured as follows: for example, the light emitted from the light-projecting section is received by the light-receiving section, and the light emitted from the light-projecting section is shielded by particles contained in the compressed air, thereby changing the light quantity level of the light received by the light-receiving section.
In the embodiment, the external control device 24 may be configured as follows: when the controller 23 receives a signal indicating that the filter unit 15 needs to be replaced, the controller notifies the operator that the filter unit 15 needs to be replaced by flashing a light or sounding a buzzer, for example.
Description of the reference numerals
10 Filter device
11 air supply source
12 pneumatic machine
13 supply flow path
14 main body
15 filtration section
20 particle detector
21 detection flow path
22 optical sensor
22a light-receiving part
24 external control machine
25 1 st fixed orifice
26 nd 2 fixed flow orifice
27 branch flow path
28 safety valve
29 check valve
30 solenoid valve
31 diffusion member
32 silencer
33 Filter
35 flow rate adjusting part
41 variable orifice
45 flow rate adjusting part
Claims (7)
1. A filter device having a filter unit provided in a supply passage for supplying compressed air from an air supply source to an air-powered machine and removing particles contained in the compressed air flowing through the supply passage,
the filter device comprises a particle detector having a detection flow path, an optical sensor, and a flow rate adjustment unit,
the detection flow path is branched from a portion of the supply flow path on a downstream side in a flow direction of the compressed air with respect to the filter unit, and is connected to the atmosphere;
the optical sensor detects particles contained in the compressed air flowing through the detection flow path;
the flow velocity adjusting unit adjusts the flow velocity of the compressed air flowing toward the optical sensor in the detection flow path to a predetermined flow velocity regardless of the flow velocity of the compressed air flowing through the supply flow path,
the flow rate adjusting part comprises a 1 st fixed orifice, a 2 nd fixed orifice, a branch flow path and a safety valve,
the 1 st fixed orifice is provided upstream of the optical sensor in the flow direction of the compressed air in the detection flow path,
the 2 nd fixed orifice is provided in the detection flow path between the 1 st fixed orifice and the optical sensor, and has a flow path area smaller than that of the 1 st fixed orifice,
the branch flow passage is branched from a portion of the detection flow passage between the 1 st and 2 nd fixed orifices and is connected to the atmosphere,
the relief valve is provided in the branch flow passage and opens when a pressure in a portion between the 1 st fixed orifice and the 2 nd fixed orifice in the detection flow passage is higher than a predetermined pressure set in advance,
the 1 st fixed orifice has a flow passage area smaller than that of the relief valve when the relief valve is opened.
2. The filter apparatus of claim 1,
a downstream end of the branch flow path in the flow direction of the compressed air is connected to a portion of the detection flow path on a downstream side of the optical sensor in the flow direction of the compressed air, and is connected to the atmosphere via the detection flow path,
a check valve is provided between the optical sensor in the detection flow path and a connection portion connected to the downstream end of the branch flow path, the check valve blocking a flow toward the optical sensor in the compressed air flowing into the detection flow path from the downstream end of the branch flow path.
3. The filter apparatus of claim 1,
the flow rate adjusting part comprises a variable flow hole and a variable flow hole control part,
the variable orifice is provided on an upstream side of the detection flow path in a flow direction of the compressed air with respect to the optical sensor,
the variable orifice control unit controls the opening degree of the variable orifice in accordance with a pressure in a portion of the supply flow path on a downstream side in a flow direction of the compressed air relative to the filter unit.
4. The filter device according to any one of claims 1 to 3,
the particle detector further comprises an electromagnetic valve and an electromagnetic valve control unit,
the electromagnetic valve is provided at an end portion of the detection flow path adjacent to the supply flow path,
the electromagnetic valve control part controls the opening and closing of the electromagnetic valve,
the solenoid valve control unit opens the solenoid valve at a predetermined frequency set in advance.
5. The filter apparatus of claim 4,
the electromagnetic valve control unit closes the electromagnetic valve when the amount of particles detected by the optical sensor exceeds a predetermined amount set in advance.
6. The filter device according to any one of claims 1 to 3,
a diffusion member is provided in the detection flow path, and diffuses the compressed air flowing in the detection flow path.
7. The filter device according to any one of claims 1 to 3,
the particle detector is attached to the main body in a state of being disposed outside the main body, and the main body houses the filter unit.
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| JP2019-095348 | 2019-05-21 | ||
| JP2019095348A JP7045348B2 (en) | 2019-05-21 | 2019-05-21 | Filter device |
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| CN111974118A CN111974118A (en) | 2020-11-24 |
| CN111974118B true CN111974118B (en) | 2022-03-11 |
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| JP (1) | JP7045348B2 (en) |
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| CN112957834B (en) * | 2021-03-11 | 2021-11-19 | 中国石油大学(北京) | Switching two-stage coalescence-separation system |
| KR102593784B1 (en) * | 2021-08-11 | 2023-10-25 | (주)에이치앤지텍 | A Diffuser for a Pressurized Air and an Apparatus for Measuring the Pressurized Air |
| JP2023160326A (en) * | 2022-04-22 | 2023-11-02 | Ckd株式会社 | Particle detector |
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| Publication number | Publication date |
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| CN111974118A (en) | 2020-11-24 |
| JP7045348B2 (en) | 2022-03-31 |
| JP2020189264A (en) | 2020-11-26 |
| TW202042890A (en) | 2020-12-01 |
| TWI723872B (en) | 2021-04-01 |
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