JP3811839B2 - Air valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air valve that is disposed in a pipe line for water supply or the like and rapidly discharges air in the pipe line.
[0002]
[Prior art]
Conventionally, this type of air valve has a structure disclosed in Japanese Patent Application Laid-Open No. 59-1882. As shown in FIG. 8, a step portion 23 is formed in the opening 20 at the top of the valve box 1. On the other hand, reference numeral 2 denotes a valve body guide having an upper portion and a flange 36 at the upper edge. A pilot hole 3 is formed in the bottom portion of the valve element guide 2. A plurality of windows 5 communicating with the passage 4 on the side of the valve element guide 2 are formed around the valve element guide 2. A lid 7 having a large air hole 6 is fixed to the upper portion of the valve box 1. At this time, the flange 36 is placed on the stepped portion 23 and the lid 7 is pressed from above to fix the valve element guide 2.
[0003]
Next, a spherical float valve element 10 and a floating valve element 11 are provided in the valve element guide 2 so as to be movable up and down. The float valve body 10 has a specific gravity of 1 or less. The floating valve body 11 is formed with a small air hole valve seat 12 having a small air hole 13 having a small diameter at the center thereof.
[0004]
A cover 16 is attached to the top of the lid body 7.
[0005]
In such a configuration, the state shown in FIG. 8 is a case where air is present in the pipe line, the float valve body 10 is located at the bottom of the valve body guide 2, and the floating valve body 11 is also below. Is located. Therefore, the inside of the pipe line and the outside air communicate with each other through the side 4 of the valve body guide, the window 5, the large air hole 6, and the air circulation space 15.
[0006]
When water enters the pipe line in this state, the internal air is discharged through the side 4 of the valve element guide 2, the window 5, the large air hole 6, and the air circulation space 15, and water enters the valve box 1. The float valve body 10 floats with the floating valve body 11 and closes the large air hole 6.
[0007]
When air in the pipe line accumulates in the valve box 1 from this state, the float valve body 10 loses buoyancy, so the float valve body 10 is lowered. Thereby, the small air hole 13 is opened and air is discharged.
[0008]
Further, when the pressure in the pipe becomes negative, the floating valve body 11 and the float valve body 10 descend to open the large and small air holes 6. At this time, the water inside the valve body guide 2 is discharged from the pilot holes 3, Allows the valve body to descend.
[0009]
In the structure of the utility model registration No. 2516580 shown in FIG. 9, the valve box 1 has an opening 20 on the upper side, and a large air hole 6 and a small air hole 13 communicating with the atmosphere are formed. The specific gravity of the lid 7 attached to the upper opening 20 and the small pilot hole 3 at the bottom and attached to the valve box 1 so as to be movable up and down so as to open and close the small air hole 13. The valve body guide is 1 or less, and a floating valve body 11 having a specific gravity of 1 or less provided on the valve body guide 2 so as to be able to move up and down so as to open and close the large air hole 6. Here, on the upper part of the valve body guide 2, several protrusions 17 that radially bulge outward are provided. A pedestal 21 for seating the valve element guide 2 is provided at the lower part of the valve box 1.
[0010]
In such a configuration, the state shown in FIG. 9 is a case where air is present in the pipeline, and the valve element guide 2 and the idle valve element 11 are positioned below. Therefore, the inside of the pipe line communicates with the outside through the inlet 19, the side 4 of the valve element guide, and the large air hole 6. When the valve box 1 is filled with water, the valve element guide 2 and the idle valve element 11 will both rise. In this way, the valve body guide 2 closes the small air hole 13, and the idle valve body 11 closes the large air hole 6.
[0011]
When the pressure in the pipe becomes negative, the floating valve body 11 and the valve body guide 2 are lowered to open the large and small air holes 6 and 13. At this time, the water inside the valve body guide 2 is discharged from the pilot hole 3 The valve body 11 can be lowered.
[0012]
[Problems to be solved by the invention]
Of the two air valves, the structure of FIG. 9 without the float valve body 10 is very advantageous from the viewpoint of miniaturization. However, as an air valve for exhausting a large amount of air up to now, an air valve having a structure having the float valve body 10 of FIG. 8 is used. This air valve has various experimental data in various sizes and similar shapes. In particular, the data on the relationship between the shape and size of the air passage and the exhaust capacity is available. On the other hand, the structure without the above-mentioned float valve body 10 has no track record in exhausting a large amount of gas and does not have this data. When designing a new air valve, if there is a demand to design a predetermined displacement as small as possible, a structure without the flow valve body 10 should be adopted. However, in the structure without a float valve body, the absence of past data as described above makes design calculation difficult.
[0013]
That is, the passage of air from the inlet 19 of the valve box 1 to the side 4 of the valve body guide 2 and the large air hole 6 through the valve body guide window 5 has a lot of past data. Otherwise, for example, a passage-shaped air valve that passes between the pedestal 21 and the protrusion 17 is difficult to design.
[0014]
In that sense, as shown in FIG. 8, a flange 36 is provided on the upper portion of the valve body guide 2 having the window 5 on the side, and is attached so as to be suspended from the stepped portion of the upper opening 20 in the valve box 1. The air passage extends from the inlet 19 of the valve box 1 to the large air hole 6 through the valve body guide side 4, the valve body guide window 5, and the float valve body 10 is not used. Ideally, the body guide 2 is configured to contain only the idle valve body 11.
[0015]
[Means for Solving the Problems]
A valve box having an inlet in the lower part, an opening in the upper part, and a stepped part below the opening, and a large air hole and a small air hole communicating with the atmosphere are formed. A lid attached to the opening, a small pilot hole at the bottom, a window at the side, and a flange that contacts and separates from the stepped portion at the top. A valve body guide having a specific gravity of 1 or less attached to the valve box so as to be able to move up and down so as to open and close the small air hole, and a valve body guide which can be raised and lowered so as to open and close the large air hole. The floating valve body has a specific gravity of 1 or less, and the small air holes are opened when the flange is in contact with the stepped portion.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. First, an internal hollow valve box 1 connected to a pipe line (not shown) is provided. An inlet 19 and a mounting flange 18 are formed at the lower portion of the valve box 1, and a step portion 23 that is expanded outward is formed at the upper opening portion 20.
[0017]
A lid body 7 is hermetically attached to the upper portion of the valve box 1 formed in this way with a packing 8 interposed. The lid body 7 has a large air hole 6 formed at the center thereof, and a small air hole valve seat 12 and a plurality of stoppers 28 are provided on the side portion. A small air hole 13 is formed in the small air hole valve seat 12. The lower surface of the small air hole valve seat 12 protrudes downward from the lower surface of the lid 5 by a predetermined dimension.
[0018]
Next, a floating valve body 11 made of a material having a specific gravity of 1 or less is provided in the valve box 1 so as to be movable up and down. The valve body guide 2 has a small pilot hole 3 formed at the center lower portion thereof, and a flange 36 that selectively contacts and separates the stepped portion 23 or the small air hole valve seat 12 and the stopper 28 formed at the upper portion thereof. . The floating valve body 11 opens and closes the large air hole 6.
[0019]
Next, a cover 16 for forming a space 15 with a support 38 interposed is provided on the top of the lid body 7.
[0020]
In such a configuration, FIG. 1 shows a case where air is present in the pipeline, and the valve element guide 2 and the idle valve element 11 are located at the lower part due to their own weight. Therefore, the internal space of the pipe line communicates with the outside through the valve body guide side 4, the large air hole 6, and the space 15 from the inlet 19. When the pipe line is filled with water in this state, the valve box 1 is also filled, and both the valve element guide 2 and the idle valve element 11 are raised by buoyancy.
[0021]
As shown in FIG. 2, the valve body guide 2 has the upper surface of the flange 36 in contact with the small air hole valve seat 12 and the stopper 28 to close the small air hole 13. Block.
[0022]
Thereafter, when air is accumulated in the valve box 1, only the valve element guide 2 is lowered by its own weight as shown in FIG. 3, the small air hole 13 is opened, and the accumulated air is discharged.
[0023]
When the pressure in the pipe becomes negative, both the floating valve body 11 and the valve body guide 2 are lowered to open the large and small air holes 6 and 12, and the state shown in FIG. At this time, the water inside the valve element guide 2 is discharged from the pilot hole 3 to allow the floating valve element 11 to descend.
[0024]
In this embodiment, the center side of the outer peripheral edge 46 of the lower surface 40 of the idle valve body 11 is recessed. FIG. 4 shows a case where the recess is not made in this way. However, when the air flow does not flow, the entire bottom surface 40 comes into close contact with the bottom surface 42 of the valve element guide 2 and the air flows into the bottom surface from the pilot hole 3 when the air flows. The air that collides with 40 slightly pushes up the idle valve body 11 to the state shown in the figure. At this time, when the air flow passing through the cylindrical annular passage 44 constituted by the side surface of the floating valve element 11 and the valve element guide 2 from the pilot hole 3 tries to pass through the gap 45 between the lower surface 40 and the bottom surface 42, Since the gap 45 is extremely thin, the flow rate of the gap 45 is extremely high. In particular, the flow rate is always higher at the center side than the outer peripheral edge 46, so the static pressure at this point is extremely low, and thus the floating valve body 11. A force to suck down strongly is generated. This force is also generated when water flows in. Therefore, even if the inside of the valve box 1 is filled with water and the buoyancy is generated in the floating valve body 11, the floating valve body 11 cannot float due to the suction force.
[0025]
Therefore, it is necessary to provide the gap 45, and therefore the center side of the outer peripheral edge 46 of the lower surface 40 of the floating valve body is recessed.
[0026]
Instead of recessing the central portion of the lower surface 40 of the floating valve body, the center side is recessed from the place where the bottom surface 42 of the valve body guide 2 contacts the outer peripheral edge 46 of the floating valve body 11 as shown in FIG. There is also.
[0027]
FIG. 6 shows another embodiment in which only the outer peripheral edge 46 of the lower surface 40 of the floating valve body 11 is brought into contact with the bottom surface 42 of the valve body guide 2. FIG. 7 shows the bottom surface 42 of the valve body guide that is recessed in a curved shape.
[0028]
In short, only the outer peripheral edge 46 of the lower surface 40 of the idle valve element 11 is connected to the bottom surface 42 of the valve element guide 2 so that the entire lower surface 40 of the idle valve element 11 is not in close contact with the bottom surface 42 of the valve element guide 2. By making the contact and providing a gap 45 on the center side of the contact, it is possible to prevent a force for sucking the floating valve body 11 downward, and the floating valve body 11 is filled with water and has a buoyancy. Regardless of this, there is no inconvenience that the floating valve body 11 cannot be lifted due to the suction force.
[0029]
However, such a suction force is generated when the water flow passing through the cylindrical annular passage 44 constituted by the side surface of the idle valve element 11 and the valve element guide 2 from the pilot hole 3 is extremely fast, That is, the pressure at the inlet 19 is extremely high.
[0030]
Therefore, the above-described countermeasure for bringing only the outer peripheral edge 46 of the lower surface 40 of the floating valve body 11 into contact with the bottom surface 42 of the valve body guide 2 is necessary when the pressure at the inlet 19 becomes extremely high.
[0031]
【The invention's effect】
Since the present invention does not require the float valve body 10 as described above, the size of the passage can be reduced, and the passage shape is a large air hole from the inlet 19 through the side 4 of the valve body guide and the window 5 of the valve body guide. This is a continuation of No. 6 and has a long history of exhaust performance, and the design calculation becomes very easy when a new air valve having a predetermined displacement is newly designed in a small size.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of the embodiment of FIG. 1 during operation.
FIG. 3 is a vertical side view of the embodiment of FIG. 1 during operation.
FIG. 4 is a vertical side view showing a part of another embodiment of the present invention.
FIG. 5 is a vertical side view showing a part of another embodiment of the present invention.
FIG. 6 is a vertical side view showing a part of another embodiment of the present invention.
FIG. 7 is a vertical side view showing a part of another embodiment of the present invention.
FIG. 8 is a vertical side view showing a conventional air valve.
FIG. 9 is a vertical side view showing a conventional air valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body guide 3 Pilot hole 5 Window 6 Large air hole 7 Lid body 11 Floating valve body 13 Small air hole 19 Inlet 20 Opening part 23 Step part 36 Flange 40 The lower surface 42 of a floating valve body Bottom face 45 of valve body guidance Clearance 46 The outer peripheral edge of the lower surface of the idle valve body

Claims (2)

A valve box having an inlet in the lower part, an opening in the upper part, and a stepped part below the opening, and a large air hole and a small air hole communicating with the atmosphere are formed. A lid attached to the opening, a small pilot hole at the bottom, a window at the side, and a flange that contacts and separates from the stepped portion at the top. A valve body guide having a specific gravity of 1 or less attached to the valve box so as to be able to move up and down so as to open and close the small air hole, and a valve body guide which can be raised and lowered to open and close the large air hole An air valve comprising a floating valve body having a specific gravity of 1 or less, wherein the small air hole is opened when the flange is in contact with the stepped portion. Either the bottom surface of the valve body guide or the bottom surface of the idler valve body must be recessed, so that only the outer peripheral edge of the bottom surface of the idler valve body is in contact with the bottom surface of the valve body guide, The air valve according to claim 1, wherein a gap is provided between the bottom surface of the valve body guide on the side and the lower surface of the floating valve body.

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