JP2021009001A - Roll filter device - Google Patents

Abstract

To provide a technology that provides a device operable only by compression air, and thus can reduce a firing risk without using an expensive technology such as an explosion-proof construction in a roll filter device.SOLUTION: The roll filter device includes a stop position detecting switch that winds up a filter material from a roll-shaped filter material, and detects its winding length, and a filter material completion detecting switch that detects a winding diameter of the roll-shaped filter material. A component that detects feeding amount accompanied with the winding of the roll-shaped filter material and the necessity of replacement is stored in a body unit as a component operated without substantially requiring electricity that becomes a firing risk. A component requiring electric power supply for controlling these components is stored in the controlling unit, and both housing are separately disposed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a roll filter device that purifies an atmosphere while continuously exchanging filter media. In particular, there are few ignition factors caused by solvents contained in paint as a usage environment, and an explosion-proof structure with a simple configuration is substantially required. Not related to roll filter equipment.

Conventionally, as air-conditioning equipment for building structures such as buildings, for example, as proposed in Japanese Patent Application Laid-Open No. 2007-298206 (hereinafter referred to as Patent Document 1), long air filtration is performed for a long period of time. There is known a roll filter device which is provided with a roll-shaped filter wound with the filter medium and can be operated while exchanging the filtration surface under predetermined conditions. Hereinafter, the techniques disclosed in this document will be illustrated and described with reference to FIG.

FIG. 1 is a diagram schematically showing an apparatus configuration disclosed as FIG. 1 in the above-mentioned Gazette of Patent Document 1, and an apparatus in which the flow path of filtered air (white arrow A) is shown from the bottom to the top. The structure is shown by a cross section, and the hatching showing the cross section and the reference numerals of the components are partially omitted. First, the roll filter device 11 (hereinafter, may be simply referred to as “device”) accommodates the roll-shaped filter material 13a around which an unused filter material is wound on one end side of the casing 15. The roll-shaped filter material 13a drives a winding means arranged on the other end side of the casing 15, and winds the filter material while detecting the delivery of a predetermined length by a detection mechanism (not shown). Wind up as 13b. At this time, in order to perform filtration before winding the filter material (shown by the alternate long and short dash line) unwound from the roll-shaped filter material 13a on the winding roll 13b, an opening (indicated by the dotted line) penetrating the casing 15 is provided. There is. In order to support the filter material approaching the region of the opening, a wire mesh member 17 having air permeability and a holding frame member 19 are provided. Further, on one surface side of the casing 15 facing the wire mesh member 17, a fan (not shown) for passing the flow path A of the filtered air into the casing 15 is provided in the filter material in the opening region.

Next, the replacement of the roll filter material 13a described above will be described with reference to FIGS. 2 and 3 in which some of the constituent components of FIG. 1 are enlarged. FIG. 2 is an explanatory diagram focusing on the roll-shaped filter material 13a of FIG. 1, and FIG. 3 is an explanatory diagram focusing on the winding roll 13b of FIG. In these figures, components having the same function are designated by the same reference numerals, and detailed description thereof will be omitted. When the device 11 is operated for the first time, the roll-shaped filter material 13a is attached to the device 11, the filter material is unwound and passed through the opening region, and then the roll-shaped filter material 13b is set so as to be windable. At this time, a cam 23 integrally provided with the gear roll 21 and a limit switch 25 capable of contacting the cam 23 are provided at the feeding portion of the roll-shaped filter material 13a, and the gear roll is provided with the feeding of the filter material. The 21 and the cam 23 are configured to operate integrally with each other. In order to facilitate the understanding of the explanation in the latter part, the combination of various components and the cam may be simply referred to as a cam mechanism.

On the other hand, the take-up roll 13b, which is the other end of the filter material shown in FIG. 3, has an electric motor incorporated in the take-up shaft as a drive source for feeding the filter material, and detects the limit switch 25 shown in FIG. In conjunction with the signal, the filter material in the open area where dust has been repaired is wound by a motor for a predetermined length, and the filter material does not loosen and the usable filter material is always supplied to the opening area. There is. This winding operation is performed at predetermined intervals by, for example, a fixed time or a pressure loss detector provided separately, and the product of the total number of winding operations and the feed length of the filter material is the roll-shaped filter material 13a. When the length of the filter material wound around the take-up roll 13b is reached, the replacement with a new roll-shaped filter material is detected.

A detection means using such a cam mechanism is disclosed, for example, in FIG. 6 of Japanese Patent Application Laid-Open No. 54-28994 (hereinafter, Patent Document 2). In the technique of Patent Document 2, the cam shaft is attached so as to serve as a fulcrum, one end of a substantially "he" -shaped panel is brought into contact with the roll-shaped filter material, and a spring is attached to the other end. There is known a technique for detecting the winding diameter of a roll-shaped filter material, which decreases with the use of the filter material, by a cam mechanism that combines the principle of the 梃. Further, as a similar technique, in Japanese Patent Publication No. 46-14194 (hereinafter, Patent Document 3), as shown in FIG. 2 of the relevant publication, a component corresponding to the above panel is made into a rod-shaped member referred to as an “arm”. , The winding diameter is detected using the principle of the arm.

Even the applicant of the present invention has proposed this type of roll filter device, for example, in Japanese Patent Application Laid-Open No. 6-31122 (hereinafter, Patent Document 4). Although detailed description is omitted, the device is used not only for general building air conditioning, but also for example, in a painting environment and a usage environment where a large amount of dust is strictly prohibited from fire. In such applications, since electrical signals are exchanged inside the device, it is necessary to provide an explosion-proof structure to the housing of the device. This explosion-proof structure has a structure that does not ignite the solvent in the usage environment even if sparks occur due to the exchange of electrical signals that are essential in the device, but the filtered air itself introduced into the device is flammable. Therefore, the current situation is that it is not a complete measure.

As a measure for the usage environment that requires such explosion protection, for example, Japanese Patent Application Laid-Open No. 7-108200 (hereinafter referred to as Patent Document 5) proposes a paint aeration device for painting an aircraft, and supplies the air supply device arranged on the hanger ceiling. A technique is known in which outside air is supplied from an air duct and air inside a hanger accommodating an aircraft is discharged from an exhaust duct to ventilate the aircraft stored in the hanger when painting. Multiple exhaust terminals that serve as air intakes into the hanger are movably provided on the floor of the hanger, and the exhaust terminals and exhaust ducts are communicated by removable flexible ducts. In this technology, a plurality of lower air supply outlets that blow out relatively high-speed air downward in a curtain shape and a plurality of relatively low-speed air blown out in the horizontal direction are blown into the air supply duct of the paint ventilator. It discloses a form in which a horizontal air supply outlet is provided, and exemplifies a device for adding an auxiliary air conditioner to a painting booth that requires a large capacity. This device uses a pneumatically operated damper and is equipped with measures against sparks, but it is equipped with a drive system that uses electricity for the fan to blow air.

JP-A-2007-298206 ([Claims], [Fig. 2], [Fig. 3], [Fig. 5], etc.) Japanese Patent Publication No. 54-28994 ([Claims], Fig. 6 etc.) Japanese Patent Publication No. 46-14194 ([Claims], Fig. 2 etc.) Japanese Patent Application Laid-Open No. 6-31122 ([Claims], [Fig. 1], etc.) Japanese Unexamined Patent Publication No. 7-108200 ([Claims], [0018], etc.)

As described in the background technique described above, in each of the techniques of Patent Documents 1 to 4 using the roll-shaped filter material, the electrical mechanism that causes sparks cannot be excluded from the device in the usage environment. .. Further, in the technique of Patent Document 5, the pneumatic operation of the damper is conceived, but the motor (fan motor) used for blowing air is provided with an expensive explosion-proof structure, and these conventional techniques have an explosion-proof structure. There is a problem that a roll filter device that can withstand various usage environments without being provided has not been conceived. Therefore, an object of the present invention is to provide a device incorporating a mechanism utilizing air pressure in such a device, and thus it is possible to reduce the risk of ignition without using an expensive technique such as an explosion-proof structure. To provide technology.

In order to achieve this object, according to the configuration of the roll filter device of the present invention,
A switch for detecting a stop position for winding a filter material having a predetermined length from a roll-shaped filter material and detecting the predetermined length, and a switch for detecting the end of the filter medium for detecting the winding diameter of an unused roll-shaped filter material are provided. In the roll filter device
Connected to the control flow path into which compressed air was introduced, and connected to the control unit containing the first solenoid valve, the second solenoid valve, and the third solenoid valve, and the drive flow path into which compressed air was introduced, and The main unit containing the drive air control valve, air motor, stop position detection switch, and filter media end detection switch are provided separately from each other.
The control flow path described above branches in two directions, one of which supplies compressed air to the above-mentioned first solenoid valve, and the other one supplies compressed air to the second solenoid valve and the third solenoid valve.
The above-mentioned second solenoid valve is connected to the above-mentioned filter medium end detection switch, and the above-mentioned third solenoid valve is connected to the above-mentioned stop position detection switch, and the above-mentioned first solenoid valve is the above-mentioned drive. It is controlled and connected to the air control valve for
And,
The drive flow path described above is characterized in that it is drive-connected to the air motor described above via the drive air control valve described above.

Further, in carrying out the present invention, on the downstream side of the above-mentioned stop position detection switch and the above-mentioned filter medium end detection switch, a first pressure switch and a second pressure switch provided in the above-mentioned control unit are used. A configuration in which each is connected is preferable.

By applying the configuration of the present invention, the main body unit can substantially replace the electrical control with the pneumatic control only, and by arranging the main unit separately from the control unit that controls the entire electrical operation, sparks and the like can be achieved. It is possible to realize safe device operation without the risk of ignition in the usage environment without causing ignition factors.

In order to explain the background technology, it is explanatory drawing which shows the conventional roll filter apparatus by the apparatus cross section. It is explanatory drawing which enlarges and shows the outline of the part where the roll-shaped filter material of FIG. 1 which concerns on background art is attached. It is explanatory drawing which shows in the same manner as FIG. 2 by enlarging the outline of the part provided with the winding roll of FIG. 1 which concerns on a background technique. In order to explain the basic configuration of the present invention, it is an explanatory diagram mainly showing the flow path of compressed air used instead of electric power and the arrangement relationship of each component. In order to explain the operating principle of each switch, it is explanatory drawing which shows typically the arrangement relation with each component immediately after mounting a roll-shaped filter material. Similar to FIG. 5A, it is an explanatory diagram showing the arrangement relationship in the state where the replacement of the roll-shaped filter material is detected.

Hereinafter, embodiments suitable for carrying out the present invention will be described. The main configuration of the roll filter device according to the present invention consists of two housings, a main body unit that performs winding and feeding operations from the roll-shaped filter material, and a control unit that controls these operations. Here, for example, a component that may cause sparks is stored in a control unit, such as a limit switch that performs an electric detection operation adopted in Patent Document 1, and an electric motor that may cause ignition is used as an air motor. In addition, the conventional limit switch is configured to be housed in the main body unit as a switch consisting of a mechanical valve. Further, since each unit characterized by the present invention only needs to have the airtightness that is usually required for this kind of general air conditioner that does not require an explosion-proof structure, a pipe that serves as a flow path for compressed air is provided. Illustration of flanges and the like that are arranged so as to penetrate the housing partition wall of each unit is omitted.

In order to explain the basic principle of the present invention, FIG. 4 is an explanatory diagram showing a flow path of compressed air and constituent components that perform each function by utilizing this air pressure with schematic circuit symbols. In order to facilitate the understanding of the explanation, only the flow path of the compressed air is shown by a solid line in the figure, and the electrical wiring is omitted. First, the main configuration of the device according to the present invention includes a control flow path 27 and a drive flow path 29 for supplying compressed air from a compressor (not shown) into the device. The control flow path 27 is connected and introduced in the control unit 31 (dashed line), and the drive flow path 29 is connected and introduced in the main body unit 33. Since the control unit 31 is provided with electrical wiring as in the conventional case, the distance between the control unit 31 and the main body unit 33 is at least 10 m or more, more preferably 15 m or more so that the risk of ignition from the control unit 31 is reduced. It is preferable to arrange them apart by a distance. That is, the main body unit 33 excluding the components requiring power supply is installed in the usage environment such as painting work, and the control unit 31 is used to store various warning lights, timers, sensors that require power supply, and the like. Both units should be separated from each other with the above-mentioned distance so that there is no risk of ignition.

The roll-shaped filter material 35 around which the unused filter material is wound is installed so that one end thereof can be unwound and wound by the air motor 37. At this time, a switch 39 for detecting the end of the filter medium, which is a mechanical valve with a roller lever, is indirectly contacted and arranged on the surface of the roll-shaped filter material 35 via the replacement detection cam mechanism, and the unwound filter material is released. A stop position detection switch 41, which is a mechanical valve with a one-way actuating roller lever, is arranged at a position where it can operate via a feed cam mechanism for detecting the feed amount (detailed later).

(overall structure)
Next, in order to explain the principle of the device, a schematic overall configuration will be described with reference to FIG. Of the two main flow paths, the control flow path 27 is branched in two directions within the control unit 31. One of them is connected to the air supply port of the first solenoid valve 43, which is a commercially available 3-port solenoid valve that requires power supply, and the other one is further provided with a branch, and each is a commercially available power supply type 2-port solenoid valve. It is connected to the air supply port of the second solenoid valve 45 and the third solenoid valve 47. First, the output port of the first solenoid valve 43 described above is controlledly connected to the pilot port of the non-feeding type drive air control valve 51 provided in the main body unit 33 via the drive control flow path 49. .. The drive flow path 29 is connected to the air supply port of the drive air control valve 51, and the air motor 37 is drive-connected to the output port. The air motor 37 opens the air supply port in response to the inflow of compressed air into the pilot port of the drive air control valve 51, and is rotated by the compressed air sent out from the output port of the drive air control valve 51, for example. The filter material that has been filtered after the elapse of a predetermined operation time is wound up.

(Operation of cam mechanism centered on feed operation of filter material)
Next, the cooperation between the two sets of switches and the cam mechanism will be described in detail with reference to other figures. FIG. 5A shows the arrangement relationship of the two cam mechanisms in the operation of unwinding the filter material from the roll-shaped filter material, particularly the air motor in which the filter material is described above during normal filtration operation, as in FIG. 2 described as the background technique. 5B shows a state in which the winding diameter of the filter material is reduced. In these figures, the same components as those already described are designated by the same reference numerals, and the feed cam mechanism 53 associated with the stop position detection switch 41 and the exchange detection associated with the filter media end detection switch 39 are exchanged. The case where the cam mechanism 55 is provided is illustrated. First, when the device is moved for the first time, the filter material (both shown by broken lines) is pulled out from the unused roll-shaped filter material 35, and the above-mentioned opening region is further reached through the roller-shaped feed cam mechanism 53, and further, in FIG. The air motor 37 described above is set in a windable mounted state. The feed cam mechanism 53 is configured by attaching a substantially diamond-shaped cam 57 in the illustrated example to the end of a roller having a width larger than that of the filter material, and follows the drive of the air motor in the counterclockwise direction indicated by the arrow B. It is arranged so as to rotate in synchronization with the delivery of the filter material. The feed cam mechanism 53 is configured to rotate in response to the feed direction C (white arrow) of the filter material. After the installation of the roll-shaped filter material 35 is completed in this way, the filtration operation is performed, and the control order thereof is as follows. An automatic operation timer (not shown) installed in the control unit 31 shown in FIG. 4 starts counting in conjunction with the start of filtration operation of the device. When a predetermined filtration operation time elapses after the start of the filtration operation, the electric signal of the automatic operation timer is sent to the third solenoid valve 47 to open the flow path to the stop position detection switch 41. At the same time, the drive timer of the air motor starts counting, and after the lapse of the set time, the first solenoid valve 43 is energized, and the air motor 37 is driven via the drive air control valve 51 to wind the filter material. take. By this winding, the feed cam mechanism 53 shown in FIG. 5A is rotated in the direction of arrow B by rotating. As the feed cam mechanism 53 that rotates with the delivery of the filter material rotates, the cam 57 contacts and presses the roller lever of the stop position detection switch 41, and the stop position detection switch 41 operates (the air supply port is closed). , Open the exhaust port). Further, when the feed cam mechanism 53 rotates, the cam 57 gets over the roller lever and the stop position detection switch 41 returns (the air supply port is closed and the exhaust port is opened). At this time, the in-pipe pressure change “high → low → high” between the stop position detection switch 41 and the second pressure switch 63b is detected by the second pressure switch 63b described with reference to FIG. Upon receiving the detection of this pressure change, the energization of the first solenoid valve 43 is stopped and the solenoid valve 43 is switched. As a result, the pressure inside the drive control flow path 49 drops, the drive air control valve 51 is switched, and the supply of compressed air serving as a drive source is stopped, so that the drive of the air motor 37 is stopped. By such control, the feed operation of the filter material is realized once only by rotating the feed cam mechanism 53 in the direction of arrow B.

(Operation of replacement detection cam mechanism)
Further, in such an initial mounting state of FIG. 5A, one end side of a substantially "he" -shaped plate 59 is in contact with the surface of the roll-shaped filter material 35. The plate 59 is brought into contact contact with the roll surface of the roll-shaped filter material 35 in a state where the other end side of the plate is urged by the spring 61 with the rotation axis of the columnar replacement detection cam mechanism 55 as a fulcrum. .. The replacement detection cam mechanism 55 has a “kamaboko” -shaped protrusion (indicated by hatching) formed on the surface of the cylinder. As shown in FIG. 5A, immediately after the roll-shaped filter material 35 is attached, the above-mentioned filter material is repeatedly supplied to the opening region. Along with this, when the winding diameter of the roll-shaped filter material 35 gradually decreases, the replacement detection cam 55 slowly rotates in the clockwise direction (arrow D) by the plate 59, and eventually the roller lever of the filter medium end detection switch 39 is released. It behaves as if the protruding part gets over it. With this behavior, the filter medium end detection switch 39 is activated (the air supply port is closed, the exhaust port is opened), and after a certain period of time has elapsed, the internal pressure is increased again by the compressed air. The change in pressure in the pipe between the filter medium end detection switch 39 and the first pressure switch 63a is detected by the first pressure switch 63a, and a lamp prompting the replacement of the roll-shaped filter material provided in the apparatus is lit and displayed. ing. The replacement display related to the end of the filter medium is configured so that it is not reset until a new roll-shaped filter material 35 is attached.

As illustrated above, in the configuration of this preferred example, the filter material is sent out by a predetermined size mainly in cooperation with the stop position detection switch 41 and the replacement detection cam mechanism 55, and the filter medium end detection switch 39 and the replacement detection are detected. The filter medium replacement can be notified in cooperation with the cam mechanism 55, and the filtration operation using the roll-shaped filter material can be continuously performed for a relatively long time. However, the stop position detection switch 41 and the filter media end detection switch 39 using the mechanical valve cooperate with the above-mentioned two types of cam mechanisms, operate by an external force by the roller lever, and return when the external force disappears. At the time of this intermediate, both the normally open air supply port and the normally closed exhaust port are intended to be in a half-open state over the curved surface part of the cam provided in each cam mechanism, in other words, the time interval expressed as "overcoming". In addition, the compressed air flows from the air supply port to the exhaust port, and the compressed air is wasted. The handling of such a situation will be described.

This abnormal state is a phenomenon that occurs even though the cam mechanism gradually presses the roller lever on the switch side and wants to operate it in a binary manner. In order to prevent wasteful consumption of compressed air due to such an abnormal state, the second solenoid valve 45 and the second solenoid valve 45 and the second solenoid valve 45 and the second solenoid valve 45 are used during a relatively long standby time for winding, which does not require detection by the feed cam mechanism 53 and the replacement detection cam mechanism 55. 3. It is sufficient to stop the energization of both the solenoid valve 47 and close the flow paths to both the filter medium end detection switch 39 and the stop position detection switch 41 to prevent wasteful consumption of compressed air. Then, only during the winding operation in which detection by the feed cam mechanism 53 and the replacement detection cam mechanism 55 is required, the second solenoid valve 45 and the third solenoid valve 47 are energized to open the flow path to the switch to both. If this is done, the abnormal phenomenon can be eliminated.

As described in the above preferred embodiment, in the roll filter device according to the present invention, the components that cause ignition are stored in the control unit, and only the components that do not substantially require power supply are stored in the main body unit. , The filtration operation can be performed safely even in a work environment where there is a possibility of ignition. However, the present invention is not limited to the above-mentioned forms. For example, a hand valve in the middle of the piping flow path between connecting the stop position detection switch 41 and the second pressure switch 63b shown in FIG. 4, near the second pressure switch 63b, and outside the housing of the control unit. Can be provided. With the supply and discharge of compressed air, which is indispensable for the operation of the device, the expansion and compression of the compressed air are repeated in each flow path. In such a state, the mist generated by the adiabatic expansion may condense and accumulate in the flow path. In order to discharge the condensed water to the outside of the device, it is preferable to provide the above-mentioned hand valve. Further, in order to discharge the same condensed water, the drive air control valve of the flow path connecting the filter medium end detection switch 39 and the first pressure switch 63 near the first pressure switch 63 and the drive control flow path 29. It is preferable to provide a hand valve near the pilot port. In addition, the present invention is not limited to the above preferred examples such as the form (shape) of the cam, the above-mentioned automatic operation timer and the drive timer of the air motor, the operation time, and the feed rate of the filter material. It is clear that various design changes can be made within the intended range.

11: Roll filter device,
13a, 35: roll filter material, 13b: take-up roll,
15: Casing, 17: Wire mesh member, 19: Holding member,
21: Gear roll, 23: Cam, 25: Limit switch,
27: Control flow path, 29: Drive flow path, 31: Control unit, 33: Main unit,
37: Air motor, 39: Filter media end detection switch, 41: Stop position detection switch,
43: 1st solenoid valve, 45: 2nd solenoid valve, 47: 3rd solenoid valve, 49: drive control flow path,
51: Drive air control valve, 53: Feed cam mechanism, 55: Replacement detection cam mechanism,
57: Cam, 59: Plate, 61: Spring,
63a: 1st pressure switch, 63b: 2nd pressure switch,
A: Filtered air flow path, B: Rotational direction (of feed cam mechanism),
C: Feeding direction (of filter material), D: Rotation direction (of replacement detection cam mechanism).

Claims (2)

A roll provided with a stop position detection switch for winding a filter material of a predetermined length from a roll-shaped filter and detecting the predetermined length, and a filter medium end detection switch for detecting the winding diameter of an unused roll-shaped filter. In the filter device
Connected to the control flow path into which compressed air was introduced, and connected to the control unit containing the first solenoid valve, the second solenoid valve, and the third solenoid valve, and the drive flow path into which compressed air was introduced, and It is equipped with a main unit that houses a drive air control valve, an air motor, a stop position detection switch, and a filter media end detection switch.
The control flow path branches in two directions, one of which supplies compressed air to the first solenoid valve, and the other one supplies compressed air to the second solenoid valve and the third solenoid valve.
The second solenoid valve is connected to the filter medium end detection switch, the third solenoid valve is connected to the stop position detection switch, and the first solenoid valve is controlledly connected to the drive air control valve. Ori and
A roll filter device characterized in that the drive flow path is drive-connected to the air motor via the drive air control valve. A claim characterized in that, on the downstream side of the stop position detection switch and the filter medium end detection switch, the first pressure switch and the second pressure switch provided in the control unit are connected to each other. Item 2. The roll filter device according to item 1.