JP4747021B2 - Filter device - Google Patents

Description

  The present invention relates to a filter device that cleans and supplies compressed air supplied from a compressor, and preferably, a filter device that supplies clean purified dehumidified compressed air obtained by dehumidifying compressed air supplied from a compressor by a dryer device. About.

Examples of the apparatus / apparatus using the dehumidified compressed air include a dental treatment instrument that cuts and removes a carious tooth and uses a water and air to wash and dry the affected area.
In the dehumidified compressed air supplied to a medical instrument represented by such a dental treatment instrument, it is often required to be highly purified air because it often touches each part of the human body of the patient. Accordingly, there is a need for a filter device that can remove substances that may be mixed into dehumidified compressed air.

A conventional dehumidified compressed air filter device described in Japanese Patent Publication No. 03-031485 has been proposed, which is a dehumidified compressed air filter device shown in FIG.
This conventional example includes a dryer device 101, a dust removal filter 102, and a sterilization filter 103. The dust removal filter 102 and the sterilization filter 103 are provided with a drain trap 104 and a drain trap 105, respectively. Yes.

Japanese Patent Publication No. 03-031485

  In order to stably clean the supplied dehumidified compressed air, it is necessary to periodically inspect and replace the filter. However, in the configuration of the prior art, the dehumidified compressed air is not supplied to the filter every time the operation is performed. Since the inflow and the discharge of the dehumidified compressed air from the filter have to be stopped, the supply of the dehumidified compressed air is stopped during that time, and the treatment action itself must be interrupted. On the other hand, if priority is given to the treatment action, there arises a problem that the time period during which the filter can be inspected and replaced is greatly restricted.

  The present invention has been made in view of the above circumstances, and the supply of compressed air is not stopped at the time of filter inspection / replacement work, and an operator can use the air flow path to the filter pipeline after the filter inspection / replacement work. It is an object of the present invention to provide a filter device that can prevent forgetting to return and can save space during installation.

  The present invention solves the above-described problems by the solving means described below.

In the filter device according to the present invention, a cleaning filter is detachably attached to a filter pipe, compressed air is flowed into the filter pipe from the inflow pipe, and compressed air that has passed through the cleaning filter is discharged from the filter pipe to the discharge pipe. In the filter device supplied to a desired location, a bypass pipe branched from the inflow pipe upstream of the cleaning filter and connected to a filter pipe downstream of the cleaning filter, and compressed air A switching valve capable of switching between inflow to the filter line and inflow to the bypass line, and disposed in the filter line between the cleaning filter and a connection part of the bypass line, filter conduit provided with opening and closing valve capable of opening and closing, and a casing in which the filter pipe and the cleaning filter is housed, the lever of the switching valve the bypass A baffle member that prevents the casing cover from closing by contacting the lever when the direction of the pipe is switched, or when the lever of the opening / closing valve is in a position to close the filter pipe The cover is provided with a baffle member for contacting the lever so as not to close the cover of the casing .

  The on-off valve is a check valve.

It is preferable that the inflow pipe connection port and the discharge pipe connection port are provided close to the filter pipe line on the same side in the casing .

  Further, when the lever of the switching valve is switched in the bypass pipeline direction, the cover of the casing in which the filter pipeline and the cleaning filter are accommodated is not closed by the lever contacting the back surface. A lever of the switching valve is set.

  In addition, when the lever of the on-off valve is in a position to close the filter pipe, the lever abuts against the back surface so that the cover of the casing in which the filter pipe and the cleaning filter are stored is not closed. The lever of the opening / closing valve is set.

  The cleaning filter is provided with at least a line filter and an oil mist filter, the line filter and the oil mist filter are provided with a drain line, and the drain line is provided with an opening / closing valve. It is characterized by being.

  According to the first aspect, by passing compressed air through the bypass line, for example, in the case of dental treatment, the cleaning filter can be replaced without interrupting the treatment.

In addition , it can be set as a simple structure by making an on-off valve into a non-return valve.

According to claim 2 , by providing the inflow pipe connection port and the discharge pipe connection port in close proximity to each other on the same side of the filter device, piping connected to the outside is only on one surface side of the device. Since it can be consolidated, it is possible to save space when the filter device is installed. In addition, since the pipe connection work can be performed only on one surface side of the filter device, the work itself becomes easy.

Further , since the cover is not closed unless the switching valve and the open / close valve are opened, it is possible to prevent the valve from being forgotten to be opened, and the compressed air can be reliably supplied through the cleaning filter.

In addition , since the drain line is provided in the line filter and the oil mist filter, moisture in the line filter and the oil mist filter can be removed. Further, since the open / close valve is provided, it is possible to stop the leakage of the compressed air from the drain line.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram illustrating an example of a filter device 8 according to an embodiment of the present invention. FIG. 2 is an assembly drawing thereof. FIG. 3 is an explanatory diagram relating to a baffle member of the filter device 8 and a lever position of the valve.

As shown in FIG. 2, the filter device 8 is accommodated in a casing 50 including a cover 51 that is opened and closed by a hinge or the like.
Reference numeral 3 denotes a filter pipe. The filter pipe line 3 is disposed in a substantially loop shape in the casing 50, and the inflow pipe connection port 2 and the discharge pipe connection port 5 at one end are disposed close to one side wall side of the casing 50. .
The inflow pipe 1 is connected to the inflow pipe connection port 2, and the discharge pipe 6 is connected to the discharge pipe connection port 5. The inflow pipe connection port 2 and the discharge pipe connection port 5 are preferably located close to each other on the same side of the casing 50 so that the size can be reduced. However, as shown in FIG. 3 may be provided linearly.

A cleaning filter 10 is detachably attached to the filter line 3. The cleaning filter 10 includes a line filter 11, an oil mist filter 12, a deodorizing filter 13, and a sterilizing filter 14.
Here, the cleaning filter may be composed of all or a part of these filters. Further, another filter may be added.
As an example, an activated carbon filter is used as the deodorizing filter 13.

The line filter 11 and the oil mist filter 12 are provided with a drain line 7.
An open / close valve 40 is provided in the drain line 7. As an example, a ball valve is used as the opening / closing valve 40.

1 shown in FIG. 1 is a bypass pipeline. The bypass line 4 is branched from the inflow pipe 1 on the upstream side of the cleaning filter 10 and is connected to the filter line 3 on the downstream side of the cleaning filter 10.
By making the inflow pipe connection port 2 and the discharge pipe connection port 5 close to each other, the bypass line 4 can be shortened, which is preferable.

  Reference numeral 20 shown in FIG. 1 denotes a switching valve. As an example, a three-way valve is used as the switching valve 20. The switching valve 20 switches the flow of compressed air between the flow to the filter pipe 3 and the flow to the bypass pipe 4. As shown in FIG. 4, a three-way pipe 22 and two ball valves 23 and 24 may be used instead of the three-way valve.

  Reference numeral 30 shown in FIG. 1 denotes an open / close valve. The opening / closing valve 30 is disposed in the filter line 3 between the cleaning filter 10 (the sterilizing filter 14) and the connection part of the bypass line 4 so that the filter line 3 can be opened and closed. As an example, a ball valve is used as the opening / closing valve 30. Instead of the ball valve, a check valve that prevents the backflow of compressed air from the connecting portion of the bypass pipe 4 toward the cleaning filter 10 may be used.

The cover 51 is provided with a baffle member 52. Here, the baffle member 52 may have any shape such as a box shape, a rod shape, or a plate shape.
In the present embodiment, the switching valve 20 (or the ball valves 23 and 24) includes a lever 21 that rotates in a vertical plane. When the lever 21 is oriented in the vertical direction (the filter pipe line 3 is open) in FIG. 2, the cover 51 can be closed because the baffle member 52 does not hit the lever 21. On the other hand, when the lever 21 is oriented in the horizontal direction (bypass pipe 4 is open), the lever 21 hits the baffle member 52, so that the cover 51 is not closed.

Next, the operation will be described based on the above configuration.
Compressed air supplied from a compressor (not shown) is dehumidified compressed air by a dryer device (not shown) and flows into the inflow pipe 1.
The dehumidified compressed air that has flowed into the inflow pipe 1 passes through the inflow pipe connection port 2 and the switching valve 20 and flows into the filter line 3.
The dehumidified compressed air that has flowed into the filter line 3 is cleaned by the cleaning filter 10 and supplied to a desired location by the discharge pipe 6.

Here, when the dehumidified compressed air passes through the cleaning filter 10, solid particles such as iron powder contained in the dehumidified compressed air are removed by the line filter 11.
The oil mist filter 12 removes oil mist such as compressor oil contained in the dehumidified compressed air.
Further, the deodorizing filter 13 removes bad odors such as chemical odors contained in the dehumidified compressed air.
In addition, fungi such as food poisoning bacteria, viruses, and molds contained in the dehumidified compressed air are removed by the sterilizing filter 14.

  Moisture accumulated in the line filter 11 and the oil mist filter 12 is discharged to the outside of the filter through the drain line 7 by opening the opening / closing valve 40.

Next, inspection / replacement work of the cleaning filter 8 will be described.
The switching valve 20 is switched in the direction of the bypass pipeline 4 and the filter pipeline 3 is closed by the opening / closing valve 30. As a result, the dehumidified compressed air flowing in from the inflow pipe 1 passes through the bypass line 4 without passing through the filter line 3 and the cleaning filter 10.
Therefore, compressed air does not leak even if the cleaning filter 10 is removed from the filter line 3 for inspection and replacement of the cleaning filter 10, and the replacement operation of the cleaning filter 10 can be performed. Further, during this time, the compressed air flows short-circuited from the bypass pipe 4 to the discharge pipe 6 and is supplied to a desired location.

Next, the valve levers 21 and 31, the baffle member 52, and the cover 51 of the casing 50 will be described with reference to FIG.
When a three-way valve is used as the switching valve 20 and the lever 21 of the switching valve 20 is switched in the filter pipe line direction (FIG. 3A), the baffle member provided in the cover 51 Since 52 does not contact the lever 21, the cover 51 can be closed with respect to the casing 50.
On the other hand, when the lever 21 of the switching valve 20 is switched in the bypass pipeline direction (FIG. 3B), the baffle member 52 provided on the cover 51 abuts on the lever 21, so that the cover 51 Does not close. Thereby, it is possible to prevent the switching valve 20 from being forgotten to be opened after the cleaning filter 10 has been inspected and replaced.

  The lever 31 of the opening / closing valve (ball valve) 30 rotates in a horizontal plane, and is parallel to the filter pipe line 3 when it is in a position to open the filter pipe line 3. When the cleaning filter 10 is inspected / replaced, the lever 31 is rotated forward to close the filter line 3. Even if the cover 51 is to be closed as it is after the replacement work or the like, the end of the lever 31 comes into contact with the back side of the cover 51 so that the cover 51 is not closed. Accordingly, forgetting to open the opening / closing valve 30 can be prevented.

  In the above description, the lever 21 of the switching valve 20 is rotated in the vertical plane. However, it may be rotated in the horizontal plane, and the lever 31 of the opening / closing valve 30 is rotated in the vertical plane. May be. When each lever rotates in a horizontal plane, the front end of the lever contacts the back side of the cover 51 so that the cover 51 cannot be closed. When the lever rotates in a vertical plane, the baffle member 52 contacts the lever. This prevents the cover 51 from being closed.

From the above, in the present embodiment,
(1) By passing the dehumidified compressed air through the bypass line 4, the passage of the dehumidified compressed air to the filter line 3 can be stopped.
Accordingly, it is possible to perform operations such as inspection and replacement of the cleaning filter 10 provided in the filter line 3 without stopping the supply of dehumidified compressed air.
(2) After the cleaning filter 10 has been inspected and replaced, if the switching valve 20 and the opening / closing valve 30 are left closed, the cover 51 of the casing 50 is not closed. Can prevent forgetting to open.
(3) Since the inflow pipe connection port 2 and the discharge pipe connection port 5 are provided close to each other on the same side of the filter device, the connection between the filter device and an external device can be facilitated. In addition, the space can be saved when the filter device is installed.
(4) When an abnormal situation such as leakage of dehumidified compressed air from the drain line 7 of the line filter 11 or the oil mist filter 12 occurs, an emergency treatment can be performed by closing the open / close valve 40. .

It is the schematic which shows an example of the filter apparatus which concerns on embodiment of this invention. It is an assembly drawing of the filter apparatus shown in FIG. FIG. 3 is an explanatory diagram for explaining the operation of the valve levers 21 and 31, the baffle member 52, and the cover 51 of the casing 50 shown in FIG. 1. It is the schematic which shows the other example of the filter apparatus which concerns on embodiment of this invention. It is the schematic which shows an example of the filter apparatus which concerns on the conventional embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inflow pipe 2 Inflow pipe connection port 3 Filter pipe line 4 Bypass pipe line 5 Discharge pipe connection port 6 Discharge pipe 7 Drain pipe line 8 Filter device 10 Cleaning filter 11 Line filter 12 Oil mist filter 13 Deodorizing filter 14 Decontamination filter 20 Switching valve 21 Switching valve lever 30 Open / close valve 31 Open / close valve lever 40 Open / close valve 50 Casing 51 Cover 52 Disturbing member

Claims (2)

A filter in which a cleaning filter is detachably attached to a filter pipe, compressed air is supplied from the inflow pipe to the filter pipe, and compressed air that has passed through the cleaning filter is supplied from the filter pipe to a desired location by a discharge pipe In the device
A bypass pipe branched from the inflow pipe upstream of the cleaning filter and connected to a filter pipe downstream of the cleaning filter;
A switching valve capable of switching between inflow of compressed air into the filter line and inflow into the bypass line;
An open / close valve disposed in the filter line between the cleaning filter and the connection part of the bypass line, and capable of opening and closing the filter line ;
A casing in which a filter line and a cleaning filter are stored ;
When the lever of the switching valve is switched in the bypass pipe line direction, a baffle member that abuts the lever and prevents the casing cover from closing, or the lever of the opening / closing valve is the filter pipe A filter device , wherein the cover is provided with a baffle member for preventing the casing cover from closing by contacting the lever when the path is closed . Wherein the filter line, the filter apparatus of claim 1, wherein the inlet pipe connecting port and the discharge pipe connecting port, characterized in that it is provided close to a position on the same side of the casing.

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