JP2023074101A - Gas filter apparatus - Google Patents

Abstract

To provide a gas filter apparatus capable of separating and removing a liquid content and removing foreign matter such as dust and the like without requiring the independent arrangement of a steam separator.SOLUTION: A gas filter apparatus comprises: an outer case 10 formed with a gas intake chamber 13 connected from an inflow port 11, a gas sending chamber 14 connected from an outflow port 12 and a case body chamber 15; an inner case 30 where a gap Go is formed between the outer peripheral surface of the outer case and the inner peripheral surface of the case body chamber 15 and which is arranged in the case body chamber 15 so as to be communicated with the gas sending chamber 14 and form a space below a lower end part; a gas rotation introducer 20 being arranged in the outer case 10 and introducing a gas from the gas intake chamber 13 to the gap Go so as to be rotated along the inner peripheral surface of the case body chamber 15; and a filter element 40 being arranged in the inner case 30 and removing foreign matter from a gas flowing in the inner case 30 and passing through the gas sending chamber 14.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gas filter device.
The present invention

Compressed air circuits to which pneumatic devices such as air guns and air cylinders are connected are provided with air filters (gas filter devices) that remove foreign matter such as dust from the compressed air (gas) flowing through the circuits (for example, Patent document 1). In a compressed air circuit provided with such an air filter, clean compressed air from which foreign matter has been removed can be supplied to the pneumatic equipment, and the pneumatic equipment can be operated normally for a long period of time.

This type of air filter (gas filter device) provided in a compressed air circuit has a structure in which a filter member for removing foreign matter such as dust is accommodated in a case having an inlet and an outlet for compressed air. there is Compressed air flowing into the case from the inflow port passes through the filter member and flows out from the outflow port, so that foreign matter such as dust mixed in the compressed air is removed by the filter member.

JP 2019-118846 A

By the way, the compressed air flowing through the compressed air circuit contains fluids such as oil and water. For this reason, in the air filter described above, the liquid is accumulated in the filter member, the resistance when the compressed air passes through the filter member in the case increases, and the pressure of the compressed air flowing out from the outflow port is reduced to the inflow port. lower than the pressure of the compressed air entering the Due to the differential pressure of the compressed air between the inflow port and the outflow port, the passage efficiency of the compressed air in the air filter is reduced.

In order to prevent such deterioration in the passage efficiency of the compressed air in the air filter, in the compressed air circuit, there is usually a steam separator for separating and removing the liquid component on the upstream side of the compressed air flow of the air filter. will be established. Thus, the fact that the air filter must be separately provided with the steam separator in the compressed air circuit lowers the degree of freedom in the configuration of the compressed air circuit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a gas filter device capable of separating and removing liquid components and removing foreign matter such as dust without providing a separate gas-water separator. be.

A gas filter device according to the present invention includes a gas intake chamber connected to a gas inlet, a gas delivery chamber connected to a gas outlet, and a case body chamber positioned below the gas intake chamber and the gas delivery chamber. and an inner case formed with openings at upper and lower ends thereof, between the outer peripheral surface of the inner case and the inner peripheral surface of the case body chamber in the outer case A predetermined gap is formed in the interior of the case main body of the outer case so that it communicates with the gas delivery chamber in the outer case through the opening in the upper end and a space is formed below the lower end. and an inner case provided in the outer case, the inner peripheral surface of the case body chamber and the a rotating gas introducer for introducing into a gap between the inner case and the outer peripheral surface; and a gas rotation introducer provided in the inner case, which flows into the inner case through the opening at the lower end and delivers the gas from the opening at the upper end. and a filter element for removing contaminants from gas that escapes into the chamber.

According to such a configuration, gas (for example, compressed air) introduced into the outer case from the inlet passes through the gas intake chamber and is rotated along the inner peripheral surface of the case body chamber by the gas rotation introducer. It is guided to the gap between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case. Then, the gas guided to the gap between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case in the outer case flows downward in the case body chamber while rotating. In this way, liquid contained in the gas flowing downward while rotating in the gap between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case is separated from the gas by the rotation. The gas from which the liquid component has been separated and removed flows into the inner case through the opening at the lower end of the inner case, and passes through the filter element when exiting from the opening at the upper end of the inner case to the gas delivery chamber. This removes foreign matter from the gas. The gas that has flowed into the gas delivery chamber after the liquid component has been separated and removed and the foreign matter has been removed flows out of the outer case through the outlet port.

In the gas filter device according to the present invention, the gas rotation introducer comprises an outer ring joined to the inner peripheral surface of the case body chamber of the outer case, and an inner ring concentrically arranged inside the outer ring. , a ring-shaped guide member disposed in a ring-shaped space between the outer ring and the inner ring, extending in the circumferential direction thereof and inclined downward; The guide member is configured such that the plurality of guide blades are positioned in a gas flow path extending from the gas intake chamber to a gap between the inner peripheral surface of the case body chamber and the inner peripheral surface of the inner case. It can be arranged in an outer case.

With this configuration, the gas flowing into the outer case from the inlet is arranged in the ring-shaped space between the outer ring and the inner ring in the ring-shaped guide member when it escapes from the gas intake chamber to the case body chamber. It passes through a plurality of guide vanes extending in the circumferential direction and inclined downward. The plurality of guide vanes guide the gas to the gap between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case so as to rotate along the inner peripheral surface of the case body chamber.

In the gas filter device according to the present invention, the inner case is coupled to the ring-shaped guide member so that the opening of the upper end portion is connected to the inner through hole of the inner ring of the ring-shaped guide member, and the It can be configured such that it communicates with the gas delivery chamber in the outer case through an opening in the upper end and an inner through hole of the inner ring.

With such a configuration, the gas that has flowed into the inner case through the opening at the lower end of the inner case passes through the filter element and is sent out from the opening at the upper end through the inner through hole of the inner ring of the ring-shaped guide member. It reaches the chamber and flows out from the outlet.

In the gas filter device according to the present invention, the rotating gas introducer may have a configuration in which a plurality of the ring-shaped guide members are concentrically stacked.

With such a configuration, the gas flowing into the outer case from the inlet is rotated by each of the plurality of concentrically stacked ring-shaped guide members when it escapes from the gas intake chamber to the case body chamber. It is guided to the gap between the inner peripheral surface of the case main chamber and the outer peripheral surface of the inner case so as to rotate along the inner peripheral surface of the case main chamber.

In the gas filter device according to the present invention, each of the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case in the outer case may be cylindrical.

With such a configuration, gas (for example, compressed air) introduced into the outer case from the inlet passes through the gas intake chamber, and is further moved along the cylindrical inner peripheral surface of the case body chamber by the gas rotary introducer. It is guided to the gap between the inner peripheral surface of the case body chamber and the cylindrical outer peripheral surface of the inner case so as to rotate smoothly.

Further, the gas filter device according to the present invention comprises a gas intake chamber connected to a gas inlet, a gas delivery chamber connected to a gas outlet, and positioned below the gas intake chamber and the gas delivery chamber. An outer case having a case body chamber communicating with the gas intake chamber and an inner case having openings at upper and lower ends thereof, wherein the outer peripheral surface of the inner case and the A gap that gradually narrows downward is formed between the inner peripheral surface of the case main body chamber, communicates with the gas delivery chamber of the outer case through the opening at the upper end, and extends below the lower end. The inner case provided in the case main body chamber of the outer case and the inner case provided in the inner case so that a space is formed, and flow into the inner case through the opening at the lower end to the upper end. and a filter element for removing foreign matter from the gas that escapes from the opening of the gas delivery chamber to the gas delivery chamber.

With such a configuration, gas (for example, compressed air) introduced into the outer case from the inlet passes through the gas intake chamber and is formed between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case. It is introduced into a gap that gradually narrows downward. The gas introduced into this gap flows downward while rotating along the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case. The liquid contained in the gas flowing downward while rotating in the gap is separated from the gas by the rotation. The gas from which the liquid component has been separated and removed flows into the inner case through the opening at the lower end of the inner case, and passes through the filter element when exiting from the opening at the upper end of the inner case to the gas delivery chamber. This removes foreign matter from the gas. The gas that has flowed into the gas delivery chamber after the liquid component has been separated and removed and the foreign matter has been removed flows out of the outer case through the outlet port.

In the gas filter device according to the present invention, the inner peripheral surface of the case body chamber in the outer case may be cylindrical, and the outer peripheral surface of the inner case may be conical in shape expanding downward. .

With this configuration, the gas passing through the gas intake chamber gradually flows downward between the cylindrical inner peripheral surface of the case body chamber and the downwardly widening conical outer peripheral surface of the inner case. introduced into the narrowing gap. The gas introduced into this gap flows downward while rotating along the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case.

In the gas filter device according to the present invention, the filter element includes a cylindrical filter member having a predetermined thickness and a closed upper end and an opening formed at a lower end. and a filter retainer that holds the filter retainer, the opening of the lower end of the filter retainer being connected to the opening of the lower end of the inner case, and the lower end of the inner case The gas flowing in from the opening of the cylindrical filter member flows in from the lower end of the cylindrical filter member, and the gas passing from the inside to the outside of the filter member escapes from the opening at the upper end of the inner case to the gas delivery chamber. Further, it can be provided in the inner case.

With such a configuration, the gas from which the liquid is separated and removed and which flows into the inner case through the opening at the lower end of the inner case is concentrically held in the filter holder through the opening at the lower end of the filter holder. It flows into the inner side of the cylindrical filter member from its lower end. The gas that has flowed into the filter member passes from the inside to the outside of the filter member, and foreign matter is removed. Then, the gas from which the foreign matter has been removed flows into the gas delivery chamber through the opening at the upper end of the inner case and flows out from the outlet.

In the gas filter device according to the present invention, it is possible to have a connecting cylinder that penetrates the opening of the lower end of the inner case and the opening of the lower end of the filter retainer.

With such a configuration, the gas from which the liquid component has been separated and removed is concentrically held in the filter holder by passing through the connecting cylinder that passes through the opening at the lower end of the inner case and the opening at the lower end of the filter holder. It surely flows into the inside of the cylindrical filter member that is closed from the lower end thereof.

In the gas filter device according to the present invention, the filter element includes a tubular filter member having a predetermined thickness and a closed lower end and an upper opened opening. and a filter retainer that holds the filter retainer, the opening of the upper end of the filter retainer being connected to the opening of the upper end of the inner case, and the lower end of the inner case. The gas flowing in from the opening flows from the outside to the inside of the cylindrical filter member, and the gas passes through the opening at the upper end of the filter holder and the opening at the upper end of the inner case. It can be configured to be provided within the inner case so as to exit into the delivery chamber.

With such a configuration, the gas that has been separated and removed from the liquid and flows into the inner case through the opening at the lower end of the inner case flows from the outside to the inside of the tubular filter member concentrically held by the filter holder. Contaminants are removed from the gas entering and passing through the filter member from the outside to the inside. The gas from which the foreign matter has been removed flows from the inside of the filter member through the opening at the upper end of the filter holder and the opening at the upper end of the inner case, into the gas delivery chamber, and out of the outlet.

In the gas filter device according to the present invention, it is possible to have a connecting cylinder that penetrates the upper end opening of the inner case and the upper end opening of the filter holding row.

With such a configuration, the gas from which foreign matter has been removed passes through the inside of the filter member and into the gas delivery chamber through the connecting cylindrical body passing through the upper end opening of the filter holder and the upper end opening of the inner case. sure to flow in.

In the gas filter device according to the present invention, the outer case includes a first case portion in which the inflow port, the gas intake chamber, the outflow port, and the gas delivery chamber are formed, and the first case separable from the first case. and a second case portion that is joined to form the case body chamber.

With such a structure, the outer case can separate the second case portion in which the case body chamber is formed from the first case portion in which the inlet, the gas intake chamber, the outlet, and the gas delivery chamber are formed. Therefore, maintenance and replacement of the inner case, the filter holder, and the filter provided in the case main body of the outer case can be easily performed.

According to the gas filter device according to the present invention, it is possible to separate and remove liquid components and remove foreign matter such as dust without separately providing a steam separator.

FIG. 1 is a cross-sectional view showing an air filter device (gas filter device) according to a first embodiment of the present invention. 2 is a perspective view showing a ring-shaped guide member (gas rotation introducer) used in the air filter device shown in FIG. 1. FIG. 3 is a front view showing a filter holder of a filter element used in the air filter device shown in FIG. 1. FIG. FIG. 4 is a cross-sectional view showing an air filter device according to a second embodiment of the invention. FIG. 5 is a cross-sectional view showing an air filter device according to a third embodiment of the invention. FIG. 6 is a cross-sectional view showing an air filter device according to a fourth embodiment of the invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

An air filter device (gas filter device) according to a first embodiment of the present invention is configured as shown in FIG. This air filter device is provided in a compressed air circuit to which pneumatic devices such as air guns and air cylinders are connected.

In FIG. 1, the air filter device includes an outer case 10, an inner case 30, two ring-shaped guide members 20(1) and 20(2) (gas rotation introducers) provided in the outer case 10, and a filter element 40 provided within the inner case 30 . The outer case 10 is composed of a first case portion 10a and a second case portion 10b. The upper end portion of the second case portion 10b is fitted into the lower end portion of the first case portion 10a so that they are separably coupled. An O-ring 17 attached to the outer peripheral surface of the upper end portion of the second case portion 10b maintains airtightness at the connecting portion between the first case portion 10a and the second case portion 1b.

The first case portion 10a of the outer case 10 includes an air intake chamber 13 (gas intake chamber) connected from an inlet 11 into which compressed air from the compressed air circuit flows, and a flow through which the compressed air flows out toward the compressed air circuit. An air delivery chamber 14 (gas delivery chamber) connected to the outlet 12 is formed. A second case portion 10b located below the first case portion 10a in the outer case 10 is formed with a case body chamber 15 having a cylindrical inner peripheral surface. Two ring-shaped guide members 20(1) and 20(2) (detailed structure will be described later) are fitted in the upper end portion of the second case portion 10b (case body chamber 15). It is set up so that

Each of the two ring-shaped guide members 20(1) and 20(2) has the same structure and is configured as shown in FIG. Since the two ring-shaped guide members 20(1) and 20(1) have the same structure, reference numbers (1) and (2) are omitted in FIG.

2, the ring-shaped guide member 20 includes an outer ring 21 having an outer diameter substantially equal to the inner diameter of the upper end portion of the second case portion 10b (see FIG. 1) to which the ring-shaped guide member 20 is attached, and a predetermined It has an inner ring 22 (having a predetermined inner diameter) in which an inner through hole 25 having a diameter is formed. The outer ring 21 and the inner ring 22 are connected by a plurality of (for example, seven) connecting portions 23a, 23b, 23c, 23d, 23e, 23f, and 23g radially formed between them (ring-shaped space). ing. In addition, between the outer ring 21 and the inner ring 22 (ring-shaped space), extending in the circumferential direction from one connecting portion (for example, connecting portion 23a) to the adjacent connecting portion (for example, connecting portion 23b), Guide vanes 24a, 24b, 24c, 24d, 24e, 24f, and 24g are formed that are inclined from the upper surface (the surface that appears in FIG. 2) of the ring-shaped guide member 20 toward the lower surface (the surface that does not appear in FIG. 2). ing. In the ring-shaped guide member 20, an air flow path is formed along the guide blades 24a to 24g from the upper surface side, passing through the corresponding connecting portions 23a to 23g, and passing to the lower surface side. As a result, the compressed air flowing in from the upper surface side of the ring-shaped guide member 20 rotates around the axis of the ring-shaped guide member 20 (the outer ring 21 and the inner ring 22) and escapes to the lower surface side. .

Returning to FIG. 1, the lower surface of the inner ring 22(1) of one ring-shaped guide member 20(1) and the upper surface of the inner ring 22(2) of the other ring-shaped guide member 20(2) are connected. Thus, the two ring-shaped guide members 20(1) and 20(2) are integrated while being concentrically overlapped. The inner case 30 is concentrically coupled to the inner ring 22(2) of the lower ring-shaped guide member 20(2). The inner case 30 has a connecting member 32 having a through hole 32a (opening at the upper end) fixed to the upper end of a cylindrical case body 31, and a collar having a through hole 33a (opening at the lower end) at the lower end of the case body 31. It has a structure in which an attached bush 33 is fitted. Then, the first case portion 10a and the second case portion 10b are joined together so that the inner ring 22(1) of the upper ring-shaped guide member 20(1) fits the peripheral wall of the air delivery chamber 14. By forming the outer case 10, the inner case 30 includes the through hole 32a of the connector 32, the inner through hole 25(2) of the inner ring 22(2) of the lower ring-shaped guide member 20(2), and the upper side. The inner ring 22(1) of the ring-shaped guide member 20(1) communicates with the air delivery chamber 14 through the inner communication hole 25(1).

Further, as described above, the outer peripheral surface of the inner case 30 concentrically coupled to the inner ring 22(2) of the lower ring-shaped guide member 20(2) and the case in the second case portion 10b (outer case 10) A predetermined gap Go is formed with the inner peripheral surface of the main body chamber 15 . A plurality of guide vanes 24a to 24g of each of the ring-shaped guide members 20(1) and 20(2) are positioned in a flow path of compressed air continuing from the air intake chamber 13 to the gap Go.

A step portion 16 is formed at a predetermined portion of the inner peripheral surface of the case body chamber 15 of the second case portion 10b. A lower peripheral edge of the inner case 30 (the flanged bushing 33 ) is in contact with the stepped portion 16 . As a result, the inner case 30 is fixed in the case body chamber 15 while being sandwiched between the inner ring 22 ( 2 ) of the ring-shaped guide member 20 ( 2 ) and the step portion 16 . A space is formed below the inner case 30 in the case body chamber 15 . A drain trap 18 is connected to the bottom of the second case portion 10b (outer case 10).

A filter element 40 is provided inside the inner case 30 . The filter element 40 has a structure in which a cylindrical filter member 41 (for example, acrylic fiber or cellulose) having a predetermined thickness is concentrically held in a cylindrical filter holder 42 . As shown in FIG. 3, the outer peripheral wall of the filter retainer 42 that accommodates the filter member 41 therein is formed in a mesh shape and has air permeability. The opening at the upper end of the cylindrical filter holder 42 is closed by a lid 43 together with the opening at the upper end of the filter member 41 inside. The filter retainer 42 is fixed to the flanged bush 33 of the inner case 30 so as to stand upright together with the filter member 41 inside. In this state, the opening at the lower end of the filter holder 42 and the opening at the lower end of the filter member 41 are concentrically connected to the through hole 33a of the flanged bush 33 of the inner case 30. As shown in FIG. A connecting cylinder 44 passes through these openings and the through hole 33a of the flanged bush 33 of the inner case 30 (the opening at the lower end of the inner case 30). A gap Gi is formed between the inner peripheral surface of the inner case 30 (case body 31 ) and the outer peripheral surface of the filter retainer 42 , and the upper surface of the filter retainer 42 and the lower surface of the connector 32 of the inner case 30 . A gap is formed between them.

In the air filter device structured as described above, the compressed air flows as follows (see dotted line arrows in FIG. 1).

Compressed air introduced into the outer case 10 (first case portion 10a) from the inlet 11 passes through the air intake chamber 13, and flows through the case body chamber 15 by two ring-shaped guide members 20(1) and 20(2). It is guided to the gap Go between the inner peripheral surface of the case body chamber 15 and the outer peripheral surface of the inner case 30 (case body 31) so as to rotate along the inner surface of the (second case portion 10b). The compressed air introduced into the gap Go between the inner peripheral surface of the case main body chamber 15 and the outer peripheral surface of the inner case 30 (case main body 31) rotates at high speed and fills the gap Go. flows downwards. As described above, liquids (moisture, oil, etc.) contained in the compressed air flowing downward while rotating at high speed in the gap Go in the case body chamber 15 are separated and removed from the compressed air by the high speed rotation. The liquid separated and removed from the compressed air accumulates at the bottom of the outer case 10 (second case portion 10b) and is discharged to the drain trap 18. As shown in FIG.

The compressed air from which the liquid component has been removed as described above flows from the lower end of the inner case 30 to the connecting cylinder 44 (the through hole 33a of the flanged bush 33 and the opening of the lower end of the filter retainer 42 (filter member 41)). ) into the inner case 30 . The liquid-free compressed air flowing into the inner case 30 flows from the inside to the outside of the filter member 41 held by the filter retainer 42 and then to the outside of the filter retainer 42 . When the compressed air flows from the inside to the outside of the filter member 41 in this manner, the foreign matter such as dust contained in the compressed air is removed by the filter member 41 .

Compressed air from which foreign matter has been removed in this manner is released into the gap Gi between the inner peripheral surface of the inner case 30 (case body 31) and the outer peripheral surface of the filter retainer 42 and the upper surface of the filter retainer 41 (cover 43). upper surface of the inner case 30) and the lower surface of the connector 32 of the inner case 30, the through hole 32a of the connector 32 of the inner case 30 (opening at the upper end of the inner case 30), the ring-shaped guide member 20 (2 ) and 20(1) into the air delivery chamber 14 through the inner through holes 25(2) and 25(1) of 20(1). The compressed air from which the foreign matter has been removed flows from the air delivery chamber 14 through the outlet 12 into the compressed air circuit.

In the air filter device as described above, the compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 is guided by the two ring-shaped guide members 20(1) and 20(2) (gas rotation introducers). ) to the lower side of the outer case 10 (second case portion 10b: case body chamber 15), liquid is removed from the compressed air. Foreign matter such as dust is removed from the compressed air in the process in which the compressed air from which the liquid component has been removed passes through the filter element 40 (filter member 41) provided in the inner case 30 and reaches the air delivery chamber 14. be done.

According to such an air filter device, it is possible to separate and remove liquid components and remove foreign matter such as dust without separately providing an air-water separator. In addition, since the compressed air from which the liquid component has been removed passes through the filter member 41, it is possible to suppress the generation of a differential pressure between the compressed air at the inlet 11 and the outlet 12, and the compressed air passage efficiency is can be suppressed.

In the air filter device described above, the rotating gas introducer has a structure in which the two ring-shaped guide members 20(1) and 20(2) are concentrically stacked, but this is not the only option. The rotating gas introducer may be configured with a single ring-shaped guide member 20, or may have a structure in which three or more ring-shaped guide members are concentrically stacked. Furthermore, the gas rotation introducer need not have a structure using the ring-shaped guide member 20 shown in FIG. What is necessary is just to lead between the inner peripheral surface of the case body chamber 15 and the outer peripheral surface of the inner case 30 so that it rotates.

The inner peripheral surface of the case body chamber 15 of the second case portion 10b is not limited to a cylindrical shape, and may have a smooth peripheral surface such as a conical shape, for example. Further, the outer peripheral surface of the inner case 30 is not limited to a cylindrical shape as long as it has a smooth peripheral surface such as a conical shape. Further, the relationship between the inner peripheral surface of the case body chamber 15 and the outer peripheral surface of the inner case 30 is such that a predetermined gap Go is formed and the ring-shaped guide members 20(1) and 20(2) (gas rotation introducers) are arranged. It is sufficient if the compressed air introduced from the is able to descend while rotating at a high speed.

Further, the filter element 40 (filter member 41) provided in the inner case 30 is not limited to a cylindrical shape, and may be simply cylindrical or may have another shape.

An air filter device according to a second embodiment of the present invention is constructed as shown in FIG. This air filter device is different from the filter device according to the first embodiment in the mounting direction of the filter element 40 provided in the inner case 30, and is otherwise the same as the filter device according to the first embodiment. It is substantially the same as the device. Therefore, mainly different points will be described.

In FIG. 4, the opening at the lower end of the cylindrical filter holder 42 is closed by the lid 43 together with the opening at the lower end of the filter member 41 inside. The filter holder 42 is fixed to the connector 32 of the inner case 30 so as to hang down together with the filter member 41 inside. In this state, the upper end opening of the filter holder 42 and the upper end opening of the filter member 41 are concentrically connected to the through hole 32 a of the connecting member 32 of the inner case 30 . A connecting cylinder 45 passes through these openings and the through hole 32a of the connector 32 of the inner case 30 (opening at the upper end of the inner case 30). A gap Gi is formed between the inner peripheral surface of the inner case 30 (case main body 31) and the outer peripheral surface of the filter retainer 42, and a lid 43 for closing the opening at the lower end of the filter retainer 42 and the inner case. A space is formed between the through hole 33a of the flanged bush 33 of 30 and the through hole 33a.

In the air filter device structured as described above, the compressed air flows as follows (see dotted line arrows in FIG. 4).

Compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 passes through two ring-shaped guide members 20(1) and 20(2) as in the case of the first embodiment described above. Liquid is removed from the compressed air in the process of passing through (the gas rotation introducer) and heading downward to the outer case 10 (the second case portion 10b: the case body chamber 15). The compressed air from which the liquid component has been removed flows into the inner case 30 from the lower end portion of the inner case 30 through the through hole 33 a of the flanged bush 33 . The liquid-free compressed air flowing into the inner case 30 enters the gap Gi between the inner peripheral surface of the inner case 30 (case body 31 ) and the outer peripheral surface of the filter retainer 42 , and enters the filter retainer 42 . from the outside to the inside of the filter holder 42 and from the outside to the inside of the filter member 41 held by the filter holder 42 . When the compressed air flows from the outside to the inside of the filter member 41 in this manner, the foreign matter such as dust contained in the compressed air is removed by the filter member 41 .

Compressed air from which foreign matter has been removed in this way is supplied to the connecting cylinder 45 (the opening at the upper end of the filter holder 42 (filter member 41)), the two ring-shaped guide members 20(2) and 20(1). The air passes through the inner holes 25(2), 25(1) of the rings 22(2), 22(1) to the air delivery chamber 14. The compressed air from which the foreign matter has been removed flows from the air delivery chamber 14 through the outlet 12 into the compressed air circuit.

In the air filter device as described above as well, the liquid contained in the compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 is removed, and the compressed air from which the liquid is removed is transferred to the inner case. Foreign matter such as dust is removed from the compressed air in the process of reaching the air delivery chamber 14 through the filter element 40 (filter member 41) provided at 30 .

According to such an air filter device according to the second embodiment, as in the case of the air filter according to the first embodiment, the separation and removal of liquid components and the removal of dust, etc., are performed without providing a separate air-water separator. of foreign matter can be removed. Similarly, it is possible to suppress a decrease in the passage efficiency of compressed air.

An air filter device according to a third embodiment of the present invention is constructed as shown in FIG. This air filter device differs from the air filter device according to the first embodiment (see FIG. 1) in that it uses a conical inner case instead of the gas rotation introducer (ring-shaped guide member 20). . In FIG. 5, the same reference numerals are given to the same members as those shown in FIG.

5, similar to the case of the first embodiment (see FIG. 1), the outer case 10 includes an air intake chamber 13 connected to a compressed air inlet 11 and an air delivery chamber 13 connected to a compressed air outlet 12. A first case portion 10a in which a chamber 14 is formed and a second case portion 10b in which a case main body chamber 15 having a cylindrical inner peripheral surface is formed are separably connected. In the outer case 10 formed by combining the first case portion 10a and the second case portion 10b, the air intake chamber 13 of the first case portion 10a and the case main body chamber 15 of the second case portion 10b communicate with each other. . The O-ring 17 maintains airtightness at the connecting portion between the first case portion 10a and the second case portion 10b.

The inner case 50 includes a coupling 52 having a cylindrical through-hole 52a (opening at the upper end), and a conical bottom that gradually expands downward from the coupling 52 and has a through-hole formed in the center. and a bushing 53 having a through hole 53a (opening at the lower end) fitted in the through hole at the bottom of the case main body 51 . Then, the outer case 10 is formed by connecting the first case portion 10a and the second case portion 10b so that the peripheral wall of the air delivery chamber 14 is fitted in the connector 52 (through hole 52a) of the inner case 50. be done. In this state, the inner case 50 communicates with the air delivery chamber 14 through the through hole 52a of the connector 52. As shown in FIG. Between the outer peripheral surface of the conical case main body 51 that gradually widens toward the lower side of the inner case 50 provided in this way and the inner peripheral surface of the case main body 15 in the second case portion 10b (outer case 10), there is formed a downward gap. A gap Go is formed which gradually narrows toward . In this way, a space is formed below the inner case 50 arranged in the case body chamber 15 of the second case portion 10b in a state of being suspended from the peripheral wall of the air delivery chamber 14 by the connector 52. A drain trap 18 is connected to the bottom of the (outer case 10) as in the first embodiment (see FIG. 1).

A filter element 40 is provided in the inner case 50 . This filter element 40 has a structure in which a filter member 41 is held by a filter retainer 42, as in the first embodiment (see FIG. 1). The opening at the upper end of the filter retainer 42 is closed by a lid 43 together with the opening at the upper end of the filter member 41 inside, and the filter retainer 42 and the filter member 41 inside are connected to the bush of the inner case 50 . 53 so as to stand upright. In this state, the opening at the lower end of the filter holder 42 and the opening at the lower end of the filter member 41 are concentrically connected to the through hole 53a of the bush 53 of the inner case 50 (opening at the lower end of the inner case 50), The connecting cylinder 44 passes through these openings and the through hole 53a of the bush 53 (the opening at the lower end of the inner case 50). A gap Gi is formed between the inner peripheral surface of the inner case 50 (case main body 51) and the outer peripheral surface of the filter retainer 42, and the upper surface of the filter retainer 42 and the lower surface of the connector 52 of the inner case 30 are formed. A gap is formed between

In the air filter device structured as described above, the compressed air flows as follows (see dotted line arrows in FIG. 5).

Compressed air flowing into the outer case 10 (first case portion 10 a ) from the inlet 11 passes through the air intake chamber 13 and passes through the inner peripheral surface of the case body chamber 15 (second case portion 10 b ) and the outer peripheral surface of the inner case 50 . is introduced into a gap Go which is formed between and gradually narrows downward. The compressed air introduced into the gap Go flows downward through the gap Go while rotating at high speed. As described above, liquids (moisture, oil, etc.) contained in the compressed air flowing downward while rotating at high speed in the gap Go in the main body case 15 are separated and removed from the compressed air by the high speed rotation. The liquid separated and removed from the compressed air accumulates at the bottom of the outer case 10 (second case portion 10b) and is discharged to the drain trap 18. As shown in FIG.

As in the first embodiment (see FIG. 1), the compressed air from which the liquid component has been removed as described above is supplied from the lower end of the inner case 50 to the connecting cylinder 44 (the through hole 53a of the bush 53, the filter, and the like). It flows into the inner case 50 through the retainer 42 (the opening at the lower end of the filter member 41 ), and flows from the inside to the outside of the filter member 41 in the filter element 40 . When the compressed air flows from the inside to the outside of the filter member 41 in this manner, foreign matter such as dust contained in the compressed air is removed by the filter member.

Compressed air from which foreign matter has been removed in this way passes through the gap Gi between the inner peripheral surface of the inner case 50 (case body 51) and the outer peripheral surface of the filter retainer 42 and the upper surface of the filter retainer 41 (cover 43). upper surface of the inner case 30) and the lower surface of the connector 52 of the inner case 30, and through the through hole 52a (opening at the upper end of the inner case 30) of the connector 52 of the inner case 50, the air delivery chamber 14 Exit to The compressed air from which the foreign matter has been removed flows from the air delivery chamber 14 through the outlet 12 into the compressed air circuit.

In the air filter device as described above, the compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 passes through the inner peripheral surface of the case body chamber 15 (second case portion 10b) and the inner case 5. Liquid is removed from the compressed air in the process of flowing downward while rotating at high speed in the gap Go formed between the compressed air and the outer peripheral surface that gradually narrows downward. Foreign matter such as dust is removed from the compressed air in the process in which the compressed air from which the liquid component has been removed passes through the filter element 40 (filter member 41) provided in the inner case 30 and reaches the air delivery chamber 14. be done.

According to such an air filter device, as in the first embodiment and the second embodiment, it is possible to separate and remove the liquid and remove foreign matter such as dust without separately providing a steam separator. be able to. In addition, since the compressed air from which the liquid component has been removed passes through the filter member 41, it is possible to suppress the generation of a differential pressure between the compressed air at the inlet 11 and the outlet 12, and the passage efficiency of the compressed air is can be suppressed.

The cylindrical inner peripheral surface of the case body chamber 15 and the conical outer peripheral surface of the inner case 50 that gradually expands downward create a gap between the inner peripheral surface of the case body 15 and the outer peripheral surface of the inner case 50. , a Go that gradually narrows downward is formed, but the present invention is not limited to this. For example, by forming the inner peripheral surface of the case main body chamber 15 in a cylindrical shape that gradually narrows downward and the outer peripheral surface of the inner case in a cylindrical shape, the inner peripheral surface of the case main body 15 and the outer peripheral surface of the inner case 50 are formed. You may make it form Go which narrows gradually toward the downward direction between the surfaces.

An air filter device according to a fourth embodiment of the present invention is constructed as shown in FIG. This air filter device differs from the filter device according to the above-described third embodiment in the mounting direction of the filter element 40 provided in the inner case 50 . The mounting direction of the filter element 40 in the inner case 50 is the same as that of the filter device in the embodiment of FIG.

In FIG. 6, the opening at the lower end of the cylindrical filter holder 42 is closed by the lid 43 together with the opening at the lower end of the filter member 41 inside. The filter holder 42 is fixed to the connector 52 of the inner case 50 so as to hang down together with the filter member 41 inside. In this state, the upper end opening of the filter holder 42 and the upper end opening of the filter member 41 are concentrically connected to the through hole 52 a of the connecting member 52 of the inner case 50 . The connecting cylinder 45 penetrates through these openings and the through hole 52a of the connector 52 of the inner case 50 (opening at the upper end of the inner case 30). A gap Gi is formed between the inner peripheral surface of the inner case 50 (case main body 51) and the outer peripheral surface of the filter retainer 42, and a lid 43 for closing the opening at the lower end of the filter retainer 42 and the inner case. A space is formed between the through hole 53a of the bush 53 of 50 and the through hole 53a.

In the air filter device structured as described above, the compressed air flows as follows (see dotted line arrows in FIG. 6).

Compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 passes through the inner peripheral surface of the case body chamber 15 and the outer peripheral surface of the inner case 50, as in the third embodiment. Liquid is removed from the compressed air in the process of descending while rotating at high speed in the gap Go formed between and gradually narrowing downward. Then, the compressed air from which the liquid component has been removed flows into the inner case 50 through the lower end portion of the inner case 50 or the through hole 53 a of the bush 53 . The liquid-free compressed air flowing into the inner case 50 enters the gap Gi between the inner peripheral surface of the inner case 50 (case body 51 ) and the outer peripheral surface of the filter retainer 42 , and flows from the outside of the filter retainer 42 . It flows from the inside and further from the outside of the filter member 41 held by the filter holder 42 to the inside. When the compressed air flows from the outside to the inside of the filter member 41 in this manner, the foreign matter such as dust contained in the compressed air is removed by the filter member 41 .

The compressed air from which foreign matter has been removed in this manner passes through the connecting cylinder 45 (the opening at the upper end of the filter holder 42 (filter member 41)) and flows into the air delivery chamber 14. As shown in FIG. The compressed air from which the foreign matter has been removed flows from the air delivery chamber 14 through the outlet 12 into the compressed air circuit.

In the air filter device as described above as well, the liquid contained in the compressed air flowing into the outer case 10 (first case portion 10a) from the inlet 11 is removed, and the compressed air from which the liquid is removed is transferred to the inner case. Foreign matter such as dust is removed from the compressed air in the process of reaching the air delivery chamber 14 through the filter element 40 (filter member 41) provided at 30 .

According to the air filter device according to the fourth embodiment, like the air filters according to the first to third embodiments, the liquid is separated and removed without separately providing a steam separator. At the same time, foreign matter such as dust can be removed. Similarly, it is possible to suppress a decrease in the passage efficiency of compressed air.

In each of the embodiments described above, liquid and foreign matter are removed from compressed air, but the gas filter device according to the present invention is not limited to compressed air, and removes liquid and foreign matter from other gases. can also

Although the embodiments of the present invention have been described above, each embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments described above can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims.

INDUSTRIAL APPLICABILITY The present invention has the effect of being able to separate and remove liquid components and remove foreign matter such as dust without separately providing a gas-water separator, and is useful as a gas filter device.

10 outer case 10a first case 10b second case 11 inlet 12 outlet 13 air intake chamber 14 air delivery chamber 15 case body chamber 16 stepped portion 17 O-ring 18 drain trap 20, 20(1), 20(2) ) Ring-shaped guide member (gas rotation introducer)
21, 21(1), 21(2) Outer rings 22, 22(1), 22(2) Inner rings 23a to 23g Connecting parts 24a to 24g Guide vanes 25, 25(1), 25(2) Inner through holes 30, 50 inner case 31, 51 case main body 32, 52 connector 40 filter element 41 filter member 42 filter retainer

Claims (12)

an outer case having a gas intake chamber connected to a gas inlet, a gas delivery chamber connected to a gas outlet, and a case body chamber located below the gas intake chamber and the gas delivery chamber;
An inner case having an opening formed at each of an upper end portion and a lower end portion, wherein a predetermined gap is formed between an outer peripheral surface of the inner case and an inner peripheral surface of the case body chamber of the outer case, an inner case provided within the case main body chamber of the outer case so as to communicate with the gas delivery chamber in the outer case through an opening at the upper end and form a space below the lower end;
provided in the outer case and between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case so as to rotate the gas from the gas intake chamber along the inner peripheral surface of the case body chamber a rotating gas introducer leading to the gap;
a filter element provided in the inner case for removing foreign matter from gas that flows into the inner case through the opening at the lower end and exits from the opening at the upper end to the gas delivery chamber. . The gas rotation introducer comprises:
an outer ring joined to the inner peripheral surface of the case body chamber in the outer case;
an inner ring concentrically disposed inside the outer ring;
a ring-shaped guide member having a plurality of guide vanes arranged in a ring-shaped space between the outer ring and the inner ring, extending in the circumferential direction thereof, and inclined downward;
The ring-shaped guide member is arranged such that the plurality of guide blades are positioned in a gas flow path extending from the gas intake chamber to the gap between the inner peripheral surface of the case body chamber and the outer peripheral surface of the inner case. 2. A gas filter device according to claim 1, provided within said outer case. The inner case is coupled to the ring-shaped guide member so that the opening of the upper end is connected to the inner through hole of the inner ring of the ring-shaped guide member, and the opening of the upper end and the inner ring 3. The gas filtering device according to claim 2, wherein said gas delivery chamber in said outer case communicates with said gas delivery chamber through an inner communication hole. The gas rotation introducer comprises:
4. The gas filter device according to claim 2, wherein a plurality of said ring-shaped guide members are concentrically stacked. 5. The gas filter device according to claim 1, wherein each of the inner peripheral surface of said case body chamber and the outer peripheral surface of said inner case in said outer case has a cylindrical shape. a gas intake chamber connected to a gas inflow port; a gas delivery chamber connected to a gas outflow port; and a case body chamber located below the gas intake chamber and the gas delivery chamber and communicating with the gas intake chamber. an outer case formed with
An inner case having an opening formed at each of the upper end and the lower end, the space between the outer peripheral surface of the inner case and the inner peripheral surface of the case body chamber of the outer case gradually narrowing downward. A gap is formed in the case body chamber of the outer case so as to communicate with the gas delivery chamber of the outer case through the opening in the upper end and to form a space below the lower end. the inner case,
a filter element provided in the inner case for removing foreign matter from gas that flows into the inner case through the opening at the lower end and exits from the opening at the upper end to the gas delivery chamber. . The inner peripheral surface of the case body chamber in the outer case is cylindrical,
7. The gas filter device according to claim 6, wherein the outer peripheral surface of said inner case has a conical shape that widens downward. The filter element is
a filter member formed in a cylindrical shape with a predetermined thickness;
a filter retainer having a closed upper end and an opening formed at a lower end for concentrically holding the cylindrical filter member;
The filter retainer is configured such that the opening at the lower end of the filter retainer is connected to the opening at the lower end of the inner case, and the gas flowing in from the opening at the lower end of the inner case is a cylindrical filter member. 2. The inner case is provided so that the gas flowing in from the lower end of the filter member and passing from the inside to the outside of the filter member escapes to the gas delivery chamber from the opening at the upper end of the inner case. 8. The gas filter device according to any one of thru 7. 9. The gas filter device according to claim 8, further comprising a connecting cylinder extending through said lower end opening of said inner case and said lower end opening of said filter retainer. The filter element is
a filter member formed in a cylindrical shape with a predetermined thickness;
a filter retainer having a closed lower end and an opening formed at an upper end for concentrically holding the cylindrical filter member;
The filter retainer is configured such that the upper end opening of the filter retainer is connected to the upper end opening of the inner case, and the gas flowing in from the lower end opening of the inner case is a cylindrical filter member. inside the inner case so that the gas flows into the gas delivery chamber through the upper end opening of the filter holder and the upper end opening of the inner case 8. A gas filter device according to any preceding claim, provided. 11. The gas filter device according to claim 10, further comprising a connecting cylinder extending through said upper end opening of said inner case and said upper end opening of said filter holding row. The outer case includes a first case portion in which the inlet, the gas intake chamber, the outlet, and the gas delivery chamber are formed;
12. The gas filter device according to any one of claims 1 to 11, further comprising: a second case portion separably coupled to the first case and having the case body chamber formed therein.

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