JPH0719669U - Automatic drainage device for air filters - Google Patents

Abstract

(57) [Summary] [Purpose] To securely seal the drain port during the water separation work. [Structure] As shown in (A), the corner of the enlarged diameter step portion 21 of the valve rod 18 and the corresponding upper edge 14a of the drainage port 14 are formed in a spherical shape. A relief groove 25 is provided around the edge 14a of the drainage port 14 on the upper surface of the seat 13. When the valve rod 18 is urged downward by the inflow of air, as shown in (B), the corners of the diameter-expanded step portion 21 follow the shape thereof and elastically move the edge 14a of the drainage port 14 outward. Since they are pressed while being deformed, and because the spherical surfaces are in contact with each other, the corners of the diameter-expanded stepped portion 21 are tightly adhered to each other over the entire circumference of the mouth edge 14a of the drainage port 14, and are reliably sealed and closed. As a result, the work of separating water is performed without the loss of air pressure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for automatically discharging water accumulated in a bowl of an air filter.

[0002]

[Prior art]

 First, the structure and operation of the air filter will be described with reference to FIG. 1 showing an embodiment of the present invention. On the lower surface of the body 1 having the air inlet 2 and the air outlet 3 formed on both sides, a bowl a accommodating a filter assembly 4 having a cylindrical filter element 5 mounted thereon is attached, and the air is introduced into the inlet. When flowing in from 2, the air is sent to the outside of the filter element 5 as a unidirectional swirling flow by passing through the louver 6 provided in the annular space between the bowl a and the filter element 5, and is mixed into the air. The generated water is separated by the centrifugal force, and the air from which the water has been removed enters the inside of the filter element 5 and then flows out from the outflow port 3 through the passage 8 provided in the stud 7. Flows through the through hole 10 provided in the outer peripheral edge of the baffle 9 at the lower end of the filter assembly 4 to the bottom side of the bowl a and is stored therein. That.

Conventionally, as such an automatic drainage device for an air filter, one shown in FIG. 3 is known. In this device, a sheet c having a drainage port d is screwed to the lower end side of a through hole b formed in the bottom surface of a bowl a, and a valve rod e having a pressure receiving plate f at the upper end is provided above the sheet c. It has a housed structure, and while the air is flowing into the bowl a, the pressure of the air is received by the pressure receiving plate f, the valve rod e is moved downward, and its lower end is pressed against the upper surface of the seat c. As a result, the drain port d is closed, and when the inflow of air is stopped and the inside of the bowl a is opened to the atmosphere, the residual pressure acts on the lower surface side of the pressure receiving plate f, and the valve rod e is lifted up to drain port d. Is opened so that the water accumulated in the bowl a is discharged.

[0004]

[Problems to be solved by the device]

 By the way, when the drainage operation is manually performed in the above-mentioned conventional apparatus, the seat c is moved downward while loosening the screw, but the valve rod e mounted on the seat c is also moved downward together. When the valve rod e is lowered, the enlarged diameter stepped portion g provided in the middle of the valve rod e is locked to the edge of the through hole b of the bowl a to stop it, and the drainage port d is opened for the first time. That is, it is necessary to loosen a certain amount of the screw of the sheet c and move it down until the drainage port d is opened, which is troublesome.

In addition, in such an air filter, if there is a leak in the drain when the drain is closed and water is being separated, the dry air supplied to the equipment to be used will be removed. Due to the pressure loss, the drain must be reliably sealed during the separation of water.

[0006]

[Means for Solving the Problems]

 The automatic drainage device of the air filter of the present invention was devised in view of the above points, and a sheet having a drainage port is tightly fitted into a through hole formed in the bottom surface of the bowl, and the sheet The lower end of the valve rod, which has a pressure receiving plate at the upper end and an enlarged diameter part that contacts the upper edge of the drain port, is loosely fitted by protruding from the lower end of the drain port. In addition, the upper edge of the drainage port and at least one of the corners of the enlarged portion of the valve rod corresponding to the edge are made spherical, and the relief groove is formed around the drainage port on the upper surface of the seat. And

[0007]

[Action]

 While air is flowing in, the air pressure is received on the upper surface of the pressure receiving plate, and the valve rod is urged downward, and the corner of the enlarged diameter part provided in the middle of the valve rod is above the seat drainage port. Is pressed against the rim of.

[0008] At that time, the corner of the enlarged diameter portion of the valve rod and the edge of the drainage port are in contact with each other in the angular shape and the spherical shape, or in the spherical shape. Since a relief groove is formed on the other side, which makes it easier to deform following the shape of the other side, the corners of the expanded diameter portion are in close contact over the entire circumference of the edge of the drainage port.

As a result, the drain outlet is reliably sealed, the water separation operation is performed without loss of air pressure, and the removed water is stored on the bottom surface of the bowl.

When the inflow of air is stopped and the inside of the bowl is opened to the atmosphere, residual pressure acts on the lower surface side of the pressure receiving plate to lift the valve rod, and the expanded diameter portion is the upper edge of the drainage port. The drainage port is opened apart from, and the water accumulated in the bowl is automatically drained through the gap between the outer circumference of the lower end of the valve rod and the inner circumference of the drainage port.

Since the valve rod is fitted with its lower end protruding from the lower end of the drainage port, the drainage port is immediately opened by pushing up the lower end of the valve rod with a finger or the like, and manual drainage is easily performed. .

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Inside the through hole 12 formed in the center of the bottom surface of the bowl 11, there is a polyurethane resin sheet 13 having a drain port 14 formed in the center thereof, and a flange 15 formed at the upper end of the sheet 13 above the through hole 12. The hose mounting portion 16 provided on the lower end of the bowl 11 is engaged with the edge of the bowl 11 so that the hose mounting portion 16 is tightly fitted.

The valve rod 18 is made of polyethylene resin, and the valve rod 18 is fitted at its lower end side into the drainage port 14 of the seat 13 with a clearance and has a dimension longer than the drainage port 14. A reduced diameter portion 19 of the drainage port 14 is formed at the upper end of the reduced diameter portion 19 and an enlarged diameter step portion 21 that can come into contact with the upper edge of the drainage port 14 is formed. The pressure receiving plate 23 is formed.

In this embodiment, in particular, as shown in detail in FIG. 2A, the corners of the diameter-increasing stepped portion 21 of the valve rod 18 and the upper edge 14a of the drainage port 14 each have a spherical shape. In addition to being formed, a relief groove 25 is provided around the edge 14a of the drainage port 14 on the upper surface of the sheet 13.

The upper surface of the pressure receiving plate 23 formed at the upper end of the valve rod 18 is formed as a gently convex arc surface, and the outer periphery thereof extends obliquely downward and the meat on the tip side. A hem portion 27 is formed that is extremely thin and is easy to bend, and the outer peripheral edge of the hem portion 27 contacts the inner periphery of the bowl 11.

The reduced diameter portion 19 of the valve rod 18 is fitted into the drainage port 14 of the seat 13 with its lower end protruding from the lower end of the drainage port 14.

The present embodiment has such a structure, and its operation will be described below. While the air is flowing in, the valve rod 18 is downwardly urged by receiving the air pressure on the upper surface of the pressure receiving plate 23, and the corner of the enlarged diameter step portion 21 provided on the way is discharged from the seat 13. It is pressed against the upper edge 14a of the water outlet 14.

At this time, since the relief groove 25 is formed around the rim 14a of the drainage port 14, as shown in FIG. 2B, the corner of the enlarged diameter step portion 21 of the valve rod 18 is According to the shape, the edge 14a of the drainage port 14 is pressed while elastically deforming to the outside, and moreover, the corner of the enlarged diameter step portion 21 and the edge 14a of the drainage port 14 contact each other with spherical surfaces. The corners of the enlarged-diameter step portion 21 are tightly attached to each other over the entire circumference of the edge 14a of the drainage port 14, so that the drainage port 14 is reliably sealed and closed.

As a result, the work of separating water is performed without loss of air pressure, and the removed water is bent on the inner peripheral surface of the bowl 11 while bending the outer peripheral edge of the hem portion 27 of the pressure receiving plate 23. It flows to the bottom side along and is accumulated.

Since the upper surface of the pressure receiving plate 23 is formed in an arc shape, the water that has dropped onto the pressure receiving plate 23 also drips toward the outer peripheral side without collecting there and flows to the bottom side of the bowl 11.

When the inflow of air is stopped and the inside of the bowl 11 is opened to the atmosphere, residual pressure acts on the lower surface side of the pressure receiving plate 23, as shown in the chain line in FIG. 1 and FIG. 2 (A). The valve rod 18 is lifted up. At this time, the outer peripheral edge of the thin skirt portion 27 of the pressure receiving plate 23 receives the residual pressure and spreads and closely adheres to the inner periphery of the bowl 11, and the residual pressure effectively works without air leakage and the valve rod. 18 is sure to move up.

As a result, the enlarged diameter step portion 21 of the valve rod 18 is separated from the upper edge 14a of the drain port 14 to open the drain port 14, and the outer periphery of the reduced diameter portion 19 of the valve rod 18 and the drain port. Water accumulated on the bottom surface of the bowl 11 is automatically discharged through a gap between the inner circumference of the bowl 14 and the inner circumference of the bowl 14.

Further, since the lower end of the valve rod 18 is fitted so as to project from the lower end of the drainage port 14, immediately by pushing up the lower end of the valve rod 18 with a finger or the like as shown by the arrow in FIG. The drainage port 14 is opened and manual drainage is easily performed.

In the above embodiment, both the corner of the enlarged diameter step portion 21 of the valve rod 18 and the edge 14a of the drainage port 14 of the seat 13 are spherical, but only one of them may be used.

[0025]

[Effect of device]

 As described in detail above, according to the present invention, the manual draining work can be performed simply and quickly by merely pushing up the lower end of the valve rod. In addition, the drainage outlet can be reliably sealed during the water separation work, and the separation work can be performed without loss of air pressure, and the structure itself for sealing is simple. There is an effect that it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view illustrating the operation thereof.

FIG. 3 is a partial cross-sectional view of a conventional example.

[Explanation of symbols]

1: Body 2: Inflow port 3: Outflow port 5: Filter element 11: Bowl 12: Through hole 13: Sheet
14: Drainage port 14a: (edge of drainage port 14) 18: Valve rod 19: Reduced diameter portion 21: Expanded diameter portion 23: Pressure receiving plate 25: Relief groove

Claims (1)

[Scope of utility model registration request] 1. A bowl containing a cylindrical filter element is mounted on the lower surface of a body having an inlet and an outlet, and air flowing from the inlet is swirled into an annular space outside the filter element. The water mixed in the air is separated by centrifugal force by sending it as a flow, and the air from which the water has been removed is passed through the inside of the filter element to flow out from the outflow port, and the removed water is put into the bowl. A device for automatically draining water accumulated in the bowl of an air filter, wherein a sheet having a drainage port is tightly fitted into a through hole formed in the bottom surface of the bowl, The drainage port is provided with a pressure receiving plate at the upper end, and a lower end portion of the valve rod having an enlarged diameter portion abutting the upper edge of the drainage port is formed so as to protrude from the lower end of the drainage port. It is loosely fitted, and at the same time, the upper edge of the drainage port and at least one of the corners of the expanded diameter portion of the valve rod corresponding thereto are made spherical, and the drainage port on the upper surface of the seat is An automatic drainage device for air filters, characterized by forming relief grooves around it.