JP2004278573A - Air vent device for conduit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve an air vent device has the same action even if a check valve mechanism for communication/shut-off between a conduit and the inside of an inner case is removed at the lower part inside the inner case to simplify a construction, in the air vent device for conduit provided with an outer case part 1 formed at a high part halfway of the conduit and fixed to a large opening outlet, an inner case part 2 rotatably and tightly fitted in the outer case part and having a float part (upper/lower float bodies 4 and 5) arranged inside, a lid part 3 of the inner case part with a valve port, wherein a plurality of through holes are opened corresponding to the outer case part and the inner case part, positional relationship between the through hole of its own and that of the outer case part is changed by rotation of the inner case part so that the inside of the inner case part and the inside of conduit are made to communicate/shut off with/from each other, and the float part provided inside the inner case part opens/closes the valve port. <P>SOLUTION: The through holes are arranged in at least two, upper and lower, stages (upper/lower through holes 13, 14, 25, and 26). At least the lower through hole is provided at the lower part of a rising float part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to an air vent device installed in a pipe of various plants, such as a cooling water supply pipe and a raw material (liquid) supply pipe, and other water mains.
[0002]
[Prior art]
The air present in the pipe, which is the flow path of the liquid, is a major factor that hinders the flow of the liquid. In the case where the air in the pipe is discharged to the outside air using such a float valve mechanism, floating substances such as dust contained in the liquid are also removed from the valve housing of the float valve mechanism together with the air. And the valve housing needs to be cleaned. In addition, this cleaning must be performed in a state where communication with the inside of the pipe is interrupted.
[0003]
As a means for solving the above-mentioned problems, an outer housing fixed to a wide-opening outlet formed at a high place in the middle of a pipe first, and a float is arranged inside the outer housing so as to be rotatably tightly fitted therein. A plurality of through-holes corresponding to the outer casing and the inner casing, respectively, and the inner casing is rotated by rotating the inner casing. An air bleeding device has been proposed in which the positional relationship with the through hole of the housing is changed to obtain a state of communication with and blocking from the inside of the pipe (Japanese Utility Model Publication No. 4-5819).
[0004]
Further, in the above-mentioned device, particularly when a large amount of air in the pipeline is required as in the case of a new pipeline, a large-diameter valve port is provided in the lid so that the large volume can be released, and the float body is provided with a small valve. It comprises a disc-shaped upper float body having a mouth and a spherical lower float body for opening and closing the small valve port. (Patent Document 2)
[0005]
Further, in order to make the operation of the float valve mechanism smooth, a non-return valve is provided at an appropriate place in the lower portion of the inner housing, in which a ball is housed inside and a water discharge / inlet chamber having a passage communicating between the inside and the outside is provided. A valve mechanism is additionally provided (Patent Document 2). That is, when air enters the inner housing and the lower float body descends in the inner housing part, water convectively flowing below the lower float body flows out to the main pipe side, and the lower float body descends. It is meant to be done quickly.
[0006]
[Patent Document 1]
Japanese Utility Model Publication No. 4-5819.
[Patent Document 2]
JP-A-2000-337540.
[0007]
[Problems to be solved by the invention]
Incidentally, the check valve mechanism protrudes downward from the bottom surfaces of the inner and outer casings. For this reason, the whole apparatus is made bulky, and accordingly, it is necessary to increase the height of the rising portion for mounting the apparatus on the main pipe.
[0008]
Further, the check valve mechanism has a ball valve inside a cylinder main body, which involves complicated manufacturing such as mounting of the valve itself and the valve mechanism. If the vertical movement of the body is hindered, there is a risk of water leakage from the main pipe side even if the air vent device main body is shut off (rotating the inner casing to cut off communication between the main pipe and the casing).
[0009]
Therefore, the present invention proposes an improvement of a conventional air vent device so as to exhibit the same function without employing a check valve mechanism.
[0010]
[Means for Solving the Problems]
An air vent device for a pipeline according to the present invention includes an outer housing fixed to a wide-mouth outlet formed at a high portion in the middle of the pipeline, and a rotatably tightly fitted inside the outer housing to be fitted therein. An inner housing for arranging the float, and a lid of the inner housing having a valve port, a plurality of through-holes corresponding to the outer housing and the inner housing are provided, and the inner housing is provided with a plurality of through holes. By changing the positional relationship between its own through-hole and the through-hole of the outer casing by turning, the communication between the inner casing and the inside of the pipe is established and shut off, and the valve port is opened and closed in the inner casing. In the air venting device for a pipeline having a float part inside, the through-holes are provided in two or more stages above and below, and at least a lower through-hole is provided below the floating float part. It is.
[0011]
When the inner casing is set to the communication position (the positions of the through holes of the inner and outer casings are matched) and air bubbles enter through the upper through holes, the float descends and discharges the bubbles to the outside of the apparatus. The lowering operation of the float portion is smoothly performed by the existence of the through-hole. Further, when the inner housing is in the shut-off position, both the upper and lower through holes are shut off, so there is no risk of water leakage.
[0012]
Embodiment
Next, an embodiment of the present invention will be described. The air bleeding device shown in the embodiment of the present invention is basically the same as the device of the prior art, and has an outer casing 1 fixed to a wide opening formed in the upper surface of the pipe, and a tightly closed inside the outer casing 1. An inner housing 2 to be fitted, a lid 3 of the inner housing having a large valve opening in the center, and a float (an air hole (small valve opening) in the center provided in the inner housing 2) And a disc-shaped upper float body 4 and a cylindrical lower float body 5).
[0013]
The outer housing 1 includes a bottomless cylindrical body 11 and a disk-shaped flange 12 formed at an upper end edge of the body 11, and the body 11 includes a plurality of flanges near the flange 12. The upper through-holes 13 are formed at regular intervals, and the lower through-holes are provided at the lowermost part of the trunk at the intervals corresponding to the upper through-holes 13 (positions that are simultaneously opened and closed by turning the inner casing). 14 is formed.
[0014]
The inner housing part 2 is composed of a main body member, a retaining ring 27 and a slip ring 28 described later, and the main body member has an annular shape in which a screw hole 22 for a bolt is provided on an upper edge of a body part 21 having a bottom surface. Is formed, a screw shaft 24 is protruded below the bottom surface, and upper and lower through holes 25 and 26 are provided at positions corresponding to the upper and lower through holes 13 and 14 of the outer casing 1. is there.
[0015]
The retaining ring 27 has an outer diameter corresponding to the body 11 of the outer casing 1 and can be screwed to the screw shaft 24. The slip ring 28 is formed of the retaining ring 27 and the outer casing. It is interposed between the body portions 11. Further, rubber seal portions are formed by coating on the outer periphery of the upper and lower through holes 25 and 26.
[0016]
The lid portion 3 has a large-diameter valve port (large valve port) 32 provided in the center of the main body 31 and a bolt hole 33 corresponding to the screw hole 22 of the flange portion 23 of the inner casing 2 provided on the outer peripheral portion. At a position close to the large valve opening 32, a push bolt 34 having a length protruding to the lower surface of the main body 31 is screwed.
[0017]
The upper float body 4 has a disk shape, and particularly has a shape in which the outer peripheral surface 41 is close to the inner wall of the inner casing 2 such that the upper float 4 itself has a slight gap such that the upper float 4 itself can easily move up and down. Further, vertical recesses 42 for appropriately securing a circulation space are provided at appropriate intervals between the outer peripheral surface 41 and the inner wall surface, and are housed in the large valve port 32 of the lid body 3 on the upper surface. Of a truncated cone or truncated pyramid, and a bottom surface at the time of floating near the upper edges of the upper through holes 13 and 25, and a small valve port 44 penetrating vertically above and below the center. . In addition, the periphery of the lower end of the small valve port 44 is formed in a structure in which the lower float 5 is tightly closed.
[0018]
The lower float body 5 has a cylindrical shape with an outer diameter that is fully accommodated in the body 21 of the inner casing 2 and has a size that allows up and down movement in the body 21. It is provided with a protruding portion 51 that comes into contact.
[0019]
The assembling of the constituent devices is basically the same as that of the conventional device. After the body 21 of the inner housing 2 is closely fitted to the body 11 of the main body member of the outer housing 1, the outer housing 1 The retaining ring 27 is screwed to the screw shaft 24 exposed from the lower end of the body. A slip ring 28 is interposed between the retaining ring 27 and the body 11 at the time of the above-mentioned screwing.
[0020]
Therefore, when the body 21 of the inner housing 2 is inserted into the body 11 of the outer housing 1 and the inner housing 2 is integrated, the inner housing 2 is prevented from falling off and the outer housing 1 It is rotatably fitted in the body 11 and smooth rotation is ensured by the interposition of the slip ring 28.
[0021]
Then, the upper and lower floats 4 and 5 are arranged in the inner casing 2 and the main body 31 of the lid 3 is placed on the flange 23 of the inner casing 2 so that the bolt holes 33 and the screw holes 22 are aligned. Then, when the fixing device is fixed with the fastening bolt 35, the entire device is assembled.
[0022]
Thus, in order to install the above-described apparatus in the pipe A for use, the pipe A is provided with a wide-open outlet C provided with a flange B in advance, and the body 11 of the outer casing 1 or the like is provided. The portion is positioned inside the outlet C, and the flange portion 12 of the outer casing 1 is overlapped on the flange B, and fixed with bolts D and nuts E for installation.
[0023]
If the bolts 35a at both ends with longer bolt heads are used for the fastening bolts 35 of the lid 3, the lid 3 and the inner casing 2 can be easily rotated using the bolts 35a at both ends. If the upper and lower through-holes 25 and 26 of the inner casing 2 and the upper and lower through-holes 13 and 14 of the outer casing 1 are matched with each other, the pipe A and the inner casing 2 The inside is in a communicating state, the liquid in the pipe A enters the inner casing 2, and the upper float 4 closes the large valve opening 32 of the lid 3, and is formed on the upper float 4. The closed passage (small valve port) 44 is closed by the lower float 5.
[0024]
In the closed state, when the air in the pipe A rises and flows into the inner casing 2 through the through holes 13 and 25, if the amount of air flowing in is small, only the lower float body 5 is lowered and the small valve When the inlet 44 is opened to release air and the inflow air is large, both the upper and lower floats 4 and 5 are lowered, the large valve port 32 of the lid 3 is opened, and air is released from the valve port 32 to the outside air. Will be released. After the air is released, it goes without saying that each float rises to the closed position of the valve port due to buoyancy.
[0025]
In particular, when the lower float body 5 moves downward due to the inflow of air, or when the upper and lower float bodies 4 and 5 both descend due to a large amount of air inflow, the inside of the inner casing 2 below the lower float body 5 is reduced. Of liquid flows out to the pipe A side through the lower through holes 14 and 26 quickly, so that the lowering operations of the floats 4 and 5 are performed smoothly.
[0026]
Opening of the inner casing 2 for cleaning or the like is performed by separating the upper and lower through holes 25 and 26 of the inner casing 2 and the upper and lower through holes 13 and 14 of the outer casing 1 as in the conventional apparatus. When the inner casing 2 and the lid 3 are rotated to the position where the hole is closed by the body wall, the communication between the pipe A and the inside of the inner casing 2 can be immediately interrupted. By removing from the inner casing 2, the inside of the inner casing 2 can be cleaned. Even if the communication between the pipe A and the inside of the inner casing 2 is cut off, the hydraulic pressure in the inner casing 2 keeps the fluid pressure in the duct, so the push bolt 34 is screwed in and the upper float 4 Is pressed down to bring the valve port 32 into a communicating state, the hydraulic pressure in the inner housing 2 is released, and the lid 3 can be easily removed.
[0027]
【The invention's effect】
As described above, the present invention relates to an air venting device that rotatably incorporates an inner housing in an outer housing, includes a float body in the inner housing, and discharges air guided into the inner housing to the outside air. A through hole for communicating and blocking between the inner housing and the pipeline is provided in two or more stages, and at least a lower through hole is provided below the floating float portion, and particularly a check valve mechanism is additionally provided. With a simple structure, it is possible to discharge liquid in the inner casing below the float and realize a quick lowering operation of the float, and there is no hindrance to communication and disconnection with the pipeline in the inner casing. It is like that.
[Brief description of the drawings]
FIG. 1 is an overall sectional view of an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of the outer casing.
FIG. 3 is an exploded perspective view of members other than the outer casing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Outer housing part 11 Body part 12 Flange part 13 Upper through hole 14 Lower through hole 2 Inner case part 21 Body part 22 Bolt screw hole 23 Flange part 24 Screw shaft 25 Upper through hole 26 Lower through hole 27 Retaining ring 28 Slip Ring 3 Lid body 31 Main body 32 Valve port (large valve port)
33 Bolt hole 34 Push bolt 35, 35a Fastening bolt 4 Upper float body 41 Outer peripheral surface 42 Vertical recess 43 Projection 44 Small valve port 5 Lower float body 51 Projection

Claims (3)

An outer casing fixed to a wide-mouth outlet formed at a high portion in the middle of the pipe, an inner casing rotatably fitted in the outer casing and having a float disposed therein, and a valve port And a plurality of through-holes corresponding to the outer casing and the inner casing, respectively, and the inner casing is rotated by the rotation of the inner casing. By changing the positional relationship with the through-hole, the communication between the inner casing and the inside of the pipe is established and a closed state is obtained, and the inside of the inner casing is provided with a float part for opening and closing the valve port. In the air vent device, the through hole is provided in two or more stages in the upper and lower stages, and at least the lower through hole is provided below the floating float portion. 2. The air vent device for a pipeline according to claim 1, wherein the lower through hole is provided along an inner bottom surface in the inner housing. The valve port of the lid portion has a large diameter, and the float portion in the inner housing portion is configured by an upper float body that opens and closes the valve port and a lower float body that opens and closes a small valve port provided in the upper float body. The air vent device for a pipeline according to claim 1 or 2.

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