JPH0319645Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vacuum breaker equipped with a check valve, and in particular can reduce water flow resistance during water flow and quickly close and close vents. This is how it was done.

[Conventional technology and its problems]

In conventional vacuum breakers of this type, when the valve is closed due to a water outage on the primary side, sand or other foreign matter may be interposed between the check valve body and the ventilation valve body, or the part may become sealed due to some other reason. When this is not possible, outside air is allowed to flow into the gap to prevent the fluid on the secondary side from being sucked into the primary side.

However, the vacuum breaker mentioned above has a valve stem or a conical coil spring installed in the center of the water passage, and its structure is complicated. Closing of the vent by the valve body is delayed,
The problem was that the fluid on the primary side often leaked to the outside.

[Means for solving problems]

In order to solve these problems, the present invention provides a valve seat at the upper end of a passage connected to the lower part of the bottom, and a vent hole is provided along the outer periphery of the valve seat. An annular vent valve body made of an elastic material having at least one concentric unevenness on its upper surface is fixed by an inner cylinder, and a ring-shaped vent valve body is attached to a lower surface of the inner peripheral edge of the vent valve body to slide along the inner wall of the passage. A check valve element fixed to a valve leg can be brought into contact with the valve leg.

[Effect]

The check valve of the present invention can significantly reduce water flow resistance during water flow, and the vent valve body quickly closes and closes the vent.

〔Example〕

Hereinafter, the configuration of the present invention will be described in more detail based on one embodiment shown in the drawings. 1 has a small-diameter passage 2 connected to the lower part of the bottom, and a ventilation valve seat 3 protruding from the upper end of the passage. A valve case 5 having a vent hole 4 extending therethrough along its outer periphery is fitted inside the valve case 1, and has a vent valve body 6, which will be described below, between it and the inner stepped portion 1'. A circular water inlet 5 having a certain opening amount in the center of the bottom plate 5a, which is an inner cylinder for fixing the
b. The shape of the vent valve seat 3 may be a flat surface or may be an inclined surface corresponding to the inclination angle of the vent valve body 6 at the time of closing and closing.

The water passage valve body 6 is made of an elastic material with a through hole 6a having a diameter slightly smaller than that of the water passage port 5b of the inner cylinder formed in the center thereof, and a hole 6a formed at a certain angle from the inner peripheral edge on the upper surface thereof. By providing at least one inclined concentric blade shape, chevron shape, wave shape, etc. unevenness 6b, the pressure receiving area at the initial stage of water flow is increased, and the valve body is immediately pushed downward and comes into contact with the ventilation valve seat 3. In addition, the ventilation port 4 can be quickly closed and closed,
When closed, a labyrinth effect is created between the inner cylinder bottom surface 5a and the watertightness of this part can be further improved.

Reference numeral 7 denotes a check valve body that comes into contact with the lower surface of the water passage valve body 6 near the through hole 6a, and at least three valve legs 8 are fixed to the lower surface of the valve body via an upper plate 8a. is slidably inserted into the passage 2 of the valve case, and a spring 9 is interposed between the shoulder 8b of the valve leg 8 and the spring receiver 9', thereby making the check valve body 7 elastic. However, by providing a concave groove as necessary on the upper surface that contacts the ventilation valve body 6, the watertightness of the area can be increased due to the labyrinth effect described above, and at the same time, the ventilation valve body 6 can be raised and lowered. The initial pressure area of the water can also be increased. In particular, the valve leg 8 in the present invention has a stepped portion 8c directly below the upper plate 8a.
The technical feature is that by integrally bending the upper plate and providing a step G between the upper plate and the shoulder part 8b, the resistance to water flowing when water is passed is further reduced. (See Figure 2).

Further, the step G may be formed by slanting the space between the upper plate 8a and the shoulder portion 8b.

Furthermore, the vent valve body 6 is shaped in advance into a so-called dish shape as shown in FIG.
By being in pressure contact with the vent hole 4, when water flow pressure is applied, the vent hole 4 can be more quickly closed off due to its restoring force.

In the figure, reference numerals 10 and 10' indicate threads provided on the inner periphery of the inner cylinder 5 and the outer periphery of the lower end of the valve case passage 2, respectively, to connect these to, for example, a water pipe or a water supply hose.

Next, to describe the operating procedure of the vacuum breaker in the above example, firstly, when the valve case 1 is attached to, for example, a water faucet via the inner cylinder 5 and water is passed through it, under normal conditions, the water pressure immediately causes the water to flow through the valve body. 6 is pressed down, its lower surface contacts the ventilation valve seat 3 and closes the ventilation port 4, and immediately after that, the water pressure pushes down the check valve body 7 against the elastic force of the spring 9. Water is passed from between each valve leg 8 to a target water storage tank or the like via a hose.

If water flow is interrupted for some reason and the primary side becomes under negative pressure, the expansion force of the spring 9 pushes up the check valve body 7 and the ventilation valve body 6, closing these parts. This prevents the fluid etc. on the secondary side from flowing backwards, but if there is a foreign object between the ventilation valve body 6 and the check valve body 7, the airtightness of the part is impaired. In this case, the outside air continues to flow into the space between the two valve bodies 6 and 7 through the vent 4, so that the fluid on the secondary side is not sucked into the primary side.

If the water level on the secondary side continues to rise, the vent 4 acts as an overflow port and drains the water to the outside, thereby reliably preventing backflow to the primary side.

[Effect of idea]

As described above, the vacuum breaker of the present invention not only can reliably prevent the backflow of the secondary fluid, but also eliminates the need for intervening a valve stem or spring in the center of the passage, unlike conventional products. Since the structure is extremely simple, water flow resistance during water flow is significantly reduced. In addition, since the upper surface of the water flow valve body 6 is provided with irregularities 6b to improve its mobility, the vent port 4 can be quickly closed and closed, and the fluid on the primary side leaks from the vent port. It has many excellent effects that could not be expected from conventional vacuum breakers of this type, such as being able to reliably prevent the occurrence of damage.

[Brief explanation of drawings]

Fig. 1 is a front view in section of the left half of the vacuum breaker of the present invention, Fig. 2 is a perspective view of the valve leg, and Fig. 3 is a partially cutaway front view showing another embodiment of the vent valve body. It is. In the figure, 1...valve case, 2...passage, 3...
Ventilation valve seat, 4... Vent port, 5... Inner cylinder, 6... Vent valve body, 7... Check valve body, 8... Valve foot.

Claims (1)

[Claims for Utility Model Registration] 1. The inner periphery of the valve case 1, which includes a ventilation valve seat 3 provided at the upper end of the passage 2 connected to the lower part of the bottom, and a ventilation hole 4 provided along the outer periphery thereof. An annular vent valve body 6 made of an elastic material and having at least one concentric unevenness 6b on its upper surface is fixed with an inner cylinder 5, while a hole in the passage 2 is attached to the lower surface of the inner peripheral edge of the vent valve body. Valve leg 8 sliding along the inner circumference
A vacuum breaker that can be brought into contact with a check valve body 7 fixed to the breaker. 2. The vacuum breaker according to claim 1, in which the ventilation valve body 6 is shaped like a plate. 3. The vacuum breaker according to claim 1 or 2 of the utility model registration claim, in which a concave groove is provided on the upper surface of the check valve body 7 that contacts the ventilation valve body 6.