JPS5986766A - Air vent apparatus for water supply tube - Google Patents

Abstract

PURPOSE:To prevent backwater by communicating a back pressure in the primary side to the secondary side through a small communicating clearance at the time of water supply stoppage by a semiclosed check valve so that the back pressure in the secondary side may not become excessive by making the air vent area smaller than the diameter of the water supply tube. CONSTITUTION:In this apparatus, a union nut 2 is connected to a water supply source, and a coupler 4 is connected to a shower hose for instance. Water supply from the supply source pushes up a check valve 11 to close an air vent 6 by a vent valve 6 to supply the water flown into the secondary side of the valve body 1 to the shower hose through the coupler 4. On the other hand, when the water supply is shut off, the check valve 11 closes a water inlet by the resiliency of a coil spring 17, but its primary side 13 and secondary side 14 are communicated through a passage clearance 12. As a result, the back pressure in the primary side 13 is transmitted to the secondary side 14, and atmosphere is drawn into the secondary side through the vent 6. Further, the atmosphere is also drawn into the primary side 13 to disrupt the vacuum therein.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air intake device for a water supply pipe, etc., which is installed in a water supply pipe and allows atmospheric air to be introduced when the inside of the pipe becomes negative pressure.
? (8, also referred to as a vacuo, breaker or vacuum breaker valve).

When the inside of the water supply pipe becomes negative pressure due to a water outage, it is popular as a device to destroy the t' (empty air) inside the pipe.
A vacuum breaker valve such as that disclosed in Publication No. 001 is known. As shown in Figure 5, the device is equipped with water supply tvyL+.
A cylindrical part is formed on the peripheral wall of the cylindrical part, and a lid d formed around a ventilation hole is fitted into the cylindrical part. 4 formed in body f and body g facing each other, and when the inside of water supply pipe a becomes negative pressure, 47 bodies g
is spaced apart from the valve seat e and passes through the vent C (t configured to introduce popularity), but because the diameter of the vent C is small, the water is cut off at 11, and the water supply at v! fl; 'I!
If the vacuum suction speed is high, the negative pressure in the water supply pipe will be immediately removed.
There was a risk that backflow would occur and sewage would be sucked up from the secondary side. Since the L1 diameter of the pore C must be much larger than the 1" diameter of the water supply pipe +1, this has the disadvantage of making the device extremely large.

The present invention has been made in view of the above, and an object of the present invention is to provide a device which is small in size yet can reliably break the vacuum and reliably prevent backflow of water.

In order to achieve the purpose, the water supply pipe intake device of the present invention has the following features:
The water supply pipe is equipped with a semi-closed check valve that opens the water inlet widely for forward flow and maintains slight communication between the primary and secondary sides through a small flow gap for reverse flow. At the same time, a vent 1-1 wider than the flow gap is opened on the secondary side of the stop valve, and air is introduced into the vent 1 when the downstream side becomes negative pressure. Boo? Even if the check valve is closed during a water outage, the primary and secondary sides of the water supply pipe are directly connected through the flow gap, so that the vacuum suction speed on the primary side is reduced. Even if the flow rate is high, j' (empty breakage) can be performed without causing a backflow of water.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In the figure, 1 is a valve button 5 formed into a substantially bifurcated shape.
-12 is fixed to the end of the valve body with an engaging ring 3 in order to connect it to the water supply source.Unij nut 1-14 is connected to the water supply light of the washing machine or shower port, so it is connected to the valve body 1 and other parts. With connection 1-1 formed at the end,
The water flow in this valve body 1 is the same as 5. Axis line -I-
A ventilation plug body 7, which is formed around the ventilation hole 11G so that the ventilation hole 6 is located at the valve body 1, is airtightly screwed onto the valve body 1 with a packing 8 interposed therebetween. 9 is a through hole that covers the outer end of the ventilation plug body 7. ■It is. A cylindrical portion 10 of the lug body 7 is provided in a protruding manner within the valve body 1.The cylindrical portion 10 of the lug body 7 is provided with a vent hole 6 at its tip. ) A single-shaped flow gap 12 is formed with a valve at 1jφ1, and the check valve also allows the inside of the valve body 1 to be connected to the downstream side 13 and secondary side 14.
It is divided into Reference numeral 15 denotes an intake valve that comes into airtight contact with the tllli, and this intake valve has four guide vanes 4116 integrally formed around it at equal intervals, as shown in FIG. By slidingly contacting the cylindrical inner wall surface of the valve body 1, the intake valve I5 can slide without tilting and can come into contact with the intake port 6 to the south. The check valve 1] is surrounded by the inner circumferential edge of the guide vane 1G so as to be slidable therein, and a relatively weak elastic cord is formed between the intake valve 15 and the check valve 11. A spring 17 is inserted in a suitably compressed state to ventilate the intake valve 15 and the check valve t11, respectively.
and is in light contact with the water inlet 5.

The intake valve for a water supply pipe constructed in this way can be used by connecting the union nut 2 to a water supply source such as a water supply pipe or a hot water supply pipe of a boiler, and connecting the connections U and 14 to, for example, a flexible shower hose. When there is water supplied from the water supply source, the water supply pressure pushes up the check valve 11 as shown in FIG. The water entering side 14 is supplied to a shower hose or the like through connection 114.

If the water supply source is cut off, the reverse 11 valve 11 closes the water inlet 5 due to the elasticity of the coil spring 17;
3 and the secondary side 14 are still in communication with the flow gap 12. Therefore, the negative pressure on the downstream side 13 gradually propagates to the secondary side 14 through the flow gap 12, and the negative pressure on the downstream side 13 suddenly becomes 2.5mm thick.・While the pressure becomes C1, the pressure on the secondary side 14 slowly becomes negative. However, if the secondary side 14 becomes even slightly negative pressure, the intake valve 15 is opened and the atmosphere is introduced from the ventilation 11 (;) which is wider than the circulation gap 12.
41. Even if the tip of the shower hose is immersed in the bathtub, negative pressure will not be generated on the secondary side 14 to suck up the hot water in the bathtub. Further, the vacuum in the next fill 13 is also destroyed by the air flowing from the vent 6 into the primary side 13 through the flow gap 12. Note that the water inlet 5 and the vent 6 are opened on the same axis of the valve bore 1, and the check valve 11 and the intake valve 1 are
By interposing the coil spring 17 between the fivi
The structure can be simplified, and both valves can be controlled with a single coil spring. Moreover, during water supply, the compressive force of the coil spring 17 is +tli <, so that the intake valve 15 is airtightly closed. Therefore, reliable operation can be expected without fear of shallow water.Furthermore, in the device of the present invention, as described above, the check valve 11 is connected to the primary side 13 and the downstream side 1.
4 and 5), so that when a drain drain plug (not shown) for freezing prevention is provided on the downstream side, by operating the drain plug, for example, a high-position drain plug is installed. The water in the shower hose attached to the hanger can also be drained from the drain plug.

As explained above, in the water supply pipe intake device of the present invention, the negative pressure on the primary side is propagated to the secondary side through a small flow gap when water is cut off using a semi-closed inverse ratio valve.
To prevent backflow of sewage, etc., without causing excessive negative pressure on the secondary side even if a vent port introducing the atmosphere is smaller than the diameter 11 of a water supply pipe.

Therefore, the present invention has the advantageous effect of being able to realize the vacuum breaking function in a small and reliable manner.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a perspective view of its ventilation valve, φ stop valve and call spring, and Fig. 3
Figures and Figure 4 LJ A longitudinal sectional view showing the operating state of Figure 1,
FIG. 5 is a longitudinal sectional view of a conventional vacuum breaker valve. 1...Valve body, 5...Water flow [21.6.
...Ventilation 1'', 11...Reverse +I: 4i, +2
...Flow gap, 13...-Next side, 14...'
75, side, 15...intake valve, 17...coil spring. Patent applicant Kitamura Valve Co., Ltd. No. 1 II No. 25! !

Claims (1)

[Scope of Claims] / A semi-circular structure that opens the water inlet widely for forward flow, and allows the primary side and secondary side to be slightly in communication with each other through a small flow gap even for reverse flow. A closed check valve is provided in the water supply pipe, and a vent that is wider than the flow gap is opened on the secondary side of the check valve, and the air is vented into the vent when the secondary side becomes negative pressure. An intake device for a water supply pipe, characterized in that it is provided with an intake valve for introducing air into the water supply pipe. 10 Water flow] and ventilation I
．． 1-, and a reverse 11. corresponding to 1 for water passage and ventilation L1, respectively. The intake device for a water supply pipe according to claim 1, characterized in that a coil spring is appropriately compressed and interposed between the valve and the intake valve.