JP6017196B2 - Vacuum breaker - Google Patents

Description

  The present invention relates to a hose connection type vacuum breaker provided with a check valve.

Patent Document 1 discloses this type of vacuum breaker.
This vacuum breaker has an inflow port on the upper end surface, an outflow port on the lower end surface, and a cylindrical valve box having a plurality of intake holes around the outflow port, and an inner wall of the valve box. An annular intake valve having elasticity that can shield all the intake holes by fixing the peripheral edge, and a check valve that is slidably provided on the lower surface of the inner peripheral edge of the intake valve. Is attached to the faucet (water tap) of the faucet, and, for example, a hose is connected to the outlet.

In normal use, the intake valve is immediately pushed down by the water supply pressure, and the lower surface of the intake valve comes into contact with the intake valve seat to shield the intake port, and the check valve is pushed down to open the valve, allowing water to pass.
Here, when water flow is interrupted for some reason and the primary side is in a negative pressure state, the check valve and intake valve are pushed up by the biasing force of the valve spring of the check valve, closing the inlet and moving to the primary side Even if it is in a state where foreign matter is present between the intake valve and the check valve to create a gap between them and the airtightness is obstructed, the intake valve and the check valve Since the outside air continues to flow in through the intake port during this period, the secondary side fluid does not flow back to the primary side.

No. 3-19645

Since the hose connection type vacuum breaker as described above is configured to be attached to a faucet of the water supply, the entire device is light and compact, and for that reason, an intake hole is formed on the lower end surface of the valve box. Even if there are multiple, it is formed only with a small diameter with respect to the central outlet, the intake amount when the intake valve is opened is extremely small, and the primary side is at best when the airtightness of the check valve is inhibited as described above There is a problem that only a negative pressure of about -5 kPa (kilopascal) can be dealt with.
Therefore, in the present invention, in a hose connection type vacuum breaker equipped with a check valve, by forming an intake hole capable of greatly increasing the intake air amount, −5 kPa on the primary side when airtightness of the check valve is inhibited. The purpose is to sufficiently prevent backflow even when a negative pressure exceeding 1 is generated.

In view of the above problems, the vacuum breaker of the present invention is a cylinder in which an inlet is provided at the upper end surface, an outlet is provided at the lower end surface, and a plurality of intake holes are provided at equal intervals on the concentric circumference of the outlet. In the valve box, in the valve box, a check valve detachably provided on a check valve seat provided around the inlet, and a concentric double circular shape surrounding the inner ports of all the intake holes The intake valve seat is provided so as to be freely attachable / detachable, and is formed of an annular plate-like intake valve biased in the seating direction to the intake valve seat. Each intake hole has a predetermined depth and a predetermined depth. It is characterized in that it is widened with a chamfer angle of .
In addition, it is more desirable that the intake hole is a long hole with a circular arc shape or a straight line shape that can surround the concentric double circular intake valve seat, and the intake hole flows at an acute angle with respect to the axis of the valve box. It is better to form it diagonally toward the entrance.

In short, the vacuum breaker of the present invention has a cylindrical valve box in which an inlet is provided at the upper end surface, an outlet is provided at the lower end surface, and a plurality of intake holes are provided at equal intervals on the concentric circumference of the outlet. A check valve detachably provided in a check valve seat provided around the inlet in the valve box, and a concentric double-circular intake valve seat surrounding the inner ports of all the intake holes It is provided with an annular plate-like intake valve that is detachably provided on the intake valve seat and is urged in the seating direction to the intake valve seat. If the check valve cannot be closed due to foreign matter intervening between the valve seats and the airtightness is inhibited (hereinafter referred to as the check valve airtightness inhibition), the intake valve spring The intake valve opens when it is separated from the intake valve seat by the negative pressure on the primary side, which is superior to the urging force, and the primary side passes through the clearance between the check valve and the check valve seat. It is continuing to flow into the outside air from the intake hole, thereby preventing backflow into the primary side of the secondary side water.
When the check valve airtightness is inhibited, even if the degree of negative pressure on the primary side is very high and the conventional product has a small amount of intake and cannot prevent backflow, the intake holes of the present invention Since the outer opening is formed with a predetermined depth and a predetermined chamfering angle, the airflow flowing into the intake hole from the outer opening to the inner opening is abrupt when it passes through the expanded outer opening at the beginning of the inflow. Since the course is narrowed, the width of the air flow is also narrowed, compressed and the flow velocity is increased, so the amount of air passing through a certain cross-sectional area for a certain time can be dramatically increased, and the valve box is blown out as a jet from the inner port Flows in.
Therefore, according to the present invention, the amount of intake air from the intake hole at the time of check valve airtightness inhibition can be drastically increased compared to the conventional product, so that a negative pressure exceeding −5 kPa is applied to the primary side as before. Even if it occurs, the backflow can be sufficiently prevented.

  By chamfering the outer port of the air intake hole with a predetermined depth and a predetermined chamfering angle, the outer port can be formed to expand with a predetermined angle. Therefore, effective expansion corresponding to the shape of the outer port that can increase the air volume is achieved. Setting and processing of formation can be performed relatively easily.

  In addition, since the intake hole has a cross-sectional shape in which the concentric double-circular intake valve seat can be surrounded by an arc or a straight long hole, the intake hole has a cross-sectional shape that is circular compared to a circular one. It is possible to increase the cross-sectional area of one intake hole and reduce the resistance of air sucked through the intake hole, thereby further increasing the intake amount. it can.

  In addition, since the intake holes are formed obliquely toward the inlet with an acute angle with respect to the axis of the valve box, the airflow flowing into the valve box from each intake hole is easily guided to the inlet without resistance. Its practical effect is significant, such as the ability to increase the amount of intake air into the box.

It is a longitudinal cross-sectional view of the vacuum breaker at the time of a water stop. It is a bottom view of FIG. It is AA sectional drawing of FIG. It is a longitudinal cross-sectional view of the vacuum breaker at the time of water flow. It is a longitudinal cross-sectional view of the vacuum breaker at the time of airtightness inhibition of a non-return valve. It is a longitudinal cross-sectional view of the vacuum breaker at the time of secondary side negative pressure generation | occurrence | production.

An embodiment of the present invention will be described below with reference to the drawings.
The vacuum breaker according to the present invention is mainly interposed between a water outlet (not shown) and a hose (not shown) of a water faucet for watering or showering to prevent backflow of secondary side water. A cylindrical valve box 1 attached to the faucet, an in-line check valve 2 built in the valve box 1, and external air is sucked when negative pressure is generated in the valve box 1. And an intake valve 3 for preventing backflow.

The valve box 1 is provided with an inlet 4 threaded with an internal thread at the center of the upper end surface 1a, and an outlet 5 threaded with an external thread at the center of the lower end surface 1b. A plurality of intake holes 6 are provided at equal intervals on the concentric circumference of the outlet 5.
In the illustrated example, the lower end surface 1b from which the outer port 6a of the intake hole 6 is exposed is formed in a conical surface shape that is gradually inclined toward the base end of the outlet 5 from the lower end of the side surface of the valve box 1. However, the lower end surface 1b may be formed in a horizontal plane.

On the other hand, an annular inner bottom (inner side surface of the lower end surface 1b) 1c of the valve box 1 is formed on a horizontal plane, and the inner bottom 1c is concentric with the circle having a predetermined width on a circumference of a predetermined diameter. An annular groove 7 is recessed, and an inner opening 6 b of the intake hole 6 is formed on the groove bottom of the annular groove 7.
The inner and outer rings of the annular groove 7 in the inner bottom 1c are provided with concentric double-circular intake valve seats 8 that surround the inner ports 6b of all the intake holes 6 and that the intake valves 3 can be detached from. .
The intake hole 6 may be provided on the horizontal inner bottom 1c surface without providing the annular groove 7.

Each intake hole 6 is formed obliquely toward the inlet 4 with an acute angle with respect to the axis 1d of the valve box 1, and the outer port 6a of the intake hole 6 is formed to expand with a predetermined angle α ° with respect to the axis 6c. Yes.
More specifically, the intake hole 6 has a cross-sectional shape (cut surface perpendicular to the axis 6c) formed in an arc-shaped long hole along the concentric circumference of the outlet 5, and the outer port 6a has a predetermined depth d. Chamfering is performed with a predetermined chamfering angle α °.

  In this embodiment, each intake hole 6 is formed obliquely toward the inlet 4 with an acute angle with respect to the axis 1d of the valve box 1 so that the intake hole 6 can be opened from the intake hole 6 to the inside of the valve box 1 when the intake valve 3 is opened. The airflow flowing inwardly is easily guided to the inlet 4 smoothly without resistance, and an increase in the amount of intake air into the valve box 1 can be expected more. Even if it is formed perpendicularly to the inner bottom 1c so as to be parallel to the valve box axis 1d, the intake hole 6 is expanded as will be described later, thereby dramatically increasing the intake amount compared to the conventional product. Therefore, although not shown, the intake hole 6 may be provided with the intake hole axis 6c vertical.

Further, in the present embodiment, as shown in FIGS. 2 and 3, the intake hole 6 is formed into six arc-shaped elongated holes that are long in the circumferential direction, and the sectional area of one of the intake holes 6 is increased. Although the resistance of the air to be sucked can be further reduced, each of the suction holes 6 may be a circle that can be surrounded by a concentric double circle of the intake valve seat 8. It is necessary to increase the number of holes so that the total area of the inner hole 6b of the intake hole 6 is the same as that of the intake hole 6 and to maintain the same strength as that at the time of forming the arcuate intake hole 6 on the lower end surface 1b.
In the present embodiment, the intake hole 6 is a long hole having an arc shape in cross section. However, the intake hole 6 may be surrounded by a concentric double circle of the intake valve seat 8 even if it is not an arc shape. The cross-sectional shape may be a straight hole (not shown).

In any case, the intake hole 6 needs to be formed so that the outer opening 6a is widened with a predetermined angle α °.
As a result, the flow of air flowing into the intake hole 6 from the outer port 6a to the inner port 6b suddenly narrows when the air flows through the expanded outer port 6a at the beginning of the inflow, so the width of the air flow is forced to be reduced and compressed. Since the flow velocity becomes faster, the amount of air passing through the constant cross-sectional area in a certain time can be increased, and the amount of intake air flowing into the valve box 1 from the inner port 6b can be dramatically increased.

The expansion of the outer port 6a does not have to be formed over the entire circumference due to the shape of the intake hole 6, but in short, by the flow path that narrows rapidly when the airflow flowing into the intake port 6 passes through the outer port 6a. It is only necessary that the flow rate is increased by compression and the amount of air passing through a constant cross-sectional area is increased, and in this embodiment, the outer opening 6a of the intake hole 6 is chamfered except for the inner arc as shown in the figure. ing.
If the intake hole 6 is a circular hole, it may be chamfered around the outer opening 6a with a predetermined depth d and a predetermined chamfering angle α °.

  Actually, all the built-in devices such as the check valve 2 and the intake valve 3 are removed, and the valve box 1 having the intake hole 6 shown in the figure is used. The valve box 1 is 200 mm above the overflow surface of the water receiving container. When the pressure of -50 kPa (kilopascal) is applied from the primary side in a state where it is installed in (millimeters), it is connected to the outlet 5 of the valve box 1 and the front end is introduced into the water receiving container. The negative pressure destruction performance that the rise of the water level did not exceed 100 mm could be exhibited.

The check valve 2 is formed in a substantially mushroom shape having a spherical crown surface, and a check valve provided around the inlet 4 in the valve box 1 so as to prevent backflow of secondary side water in the valve box 1. The valve seat 9 is detachably provided.
The check valve 2 and the check valve seat 9 are mounted on a check valve unit 10 that is continuously disposed in the inlet 4 in the valve box 1.

  The check valve unit 10 includes a valve seat support ring 10a inserted into the upper end of the valve box 1 so that a check valve seat 9 is arranged around the inside of the inlet 4, and the valve seat support ring 10a. A valve shaft sliding ring 10b disposed oppositely on the same axis, and a substantially L-shaped support rod 10c for connecting the valve shaft sliding ring 10b and the valve seat support ring 10a in a cross direction, A gap S between the support rods 10c forms part of the flow path of the inlet 4 and outlet 5 of the valve box 1.

  Then, a valve shaft 2a protruding from the back of the check valve 2 is slidably inserted into the valve shaft sliding ring 10b, and a spring receiver 2b recessed around the proximal end of the valve shaft 2a at the back of the check valve 2; A check valve spring 11 is interposed between the valve-shaped sliding ring 10b and a hook-shaped spring receiver 10d protruding outward, and the check valve 2 is attached in the valve closing direction by the check valve spring 11. It is fast.

  Further, between the valve shaft sliding ring 10b of the check valve unit 10 and a retaining ring 12 projecting inwardly at an appropriate position on the inner periphery of the outlet port 5, there is a gap S between the support rods 10c and the inlet 4 and the flow. A communication pipe 13 constituting the flow path of the outlet 5 is interposed.

  The lower end opening of the communication pipe 13 is inserted into the outlet 5 and the lower end surface is hooked to the retaining ring 12, the upper end opening is closed by the valve shaft sliding ring 10b, and the upper end opening is closed. A valve shaft 2a penetrating the valve shaft sliding ring 10b is disposed at the center of the valve shaft 2a via a gap, and a vertical rectangular communication port 13a is provided in the cross direction of the peripheral wall of the communication tube 13 protruding from the outlet 5. A series of flow paths communicating from the communication port 13a to the outflow port 5 through the lower end opening is configured.

The intake valve 3 is formed in an annular plate shape wider than the annular groove 7 on the valve box inner bottom 1c, and a communication pipe 13 protruding from the outlet 5 is inserted through the center hole thereof.
In the same manner as above, the communication pipe 13 is inserted on the upper surface of the intake valve 3, and a spring receiver 15 is interposed between the lower end of the support rod 10c protruding from the valve shaft sliding ring 10b. The intake valve spring 14 biases the intake valve 3 in the seating direction of the intake valve seat 8 (the valve closing direction of the intake valve 3).

In the vacuum breaker configured as described above, for example, the inlet 4 of the valve box 1 is connected to the water outlet of the water faucet, and the proximal end of the hose that introduces the distal end into the water storage tank at the outlet 5 is provided. Connect and use.
In the water stop state, as shown in FIG. 1, the check valve 2 is seated on the check valve seat 9 by the urging force of the check valve spring 11 to close the inlet 4, and the intake valve 3 is an intake valve spring. The urging force 14 is seated on the intake valve seat 8 and closes the outer port 6a of the intake hole 6.

When the water tap is opened, the check valve 2 is opened by separating the check valve 2 from the check valve seat 9 due to the water flow pressure exceeding the urging force of the check valve spring 11 and is supported from the inlet 4. Water is passed through the gap S between the eaves 10c, the communication port 13a, and the hose connected thereto through the outlet 5 (see FIG. 4).
Here, when the primary side is in a negative pressure state for some reason such as rupture of the water supply pipe or large pressure fluctuation in the pipe, the check valve 2 immediately sits on the check valve seat 9 and closes. The secondary side (in the hose or the water storage tank into which the hose tip is introduced) is prevented from flowing back, and the primary side is prevented from being contaminated by the backflow water.

Under the above circumstances, when the check valve 2 cannot be closed due to foreign matter X being interposed between the check valve 2 and the check valve seat 9 and the airtightness is inhibited. Is opened when the intake valve 3 is separated from the intake valve seat 8 by the negative pressure on the primary side, which exceeds the urging force of the intake valve spring 14, and the clearance between the check valve 2 and the check valve seat 9 is opened. Since the outside air continues to flow into the primary side through the secondary side water, the secondary side water does not flow back to the primary side (see FIG. 5).
In addition, each intake hole 6 is formed by expanding the outer port 6a with a predetermined angle α °, so that the airflow flowing into the intake port 6 from the outer port 6a to the inner port 6b is expanded at the beginning of the inflow. Since the path suddenly narrows after passing through the outer port 6a, the width of the airflow is also narrowed, and the air flow is compressed and the flow velocity is increased, so that the intake amount passing through a constant cross-sectional area can be dramatically increased. Even if the primary pressure generated when the airtightness of the valve 2 is inhibited is -50 kPa, the backflow can be sufficiently prevented.

  In addition, if the water pressure in the hose (secondary side) becomes negative due to the movement of water that continues to flow downstream from the outlet 5 when water supply is interrupted under normal water flow conditions, The intake valve 3 is opened, and outside air does not flow from the intake hole 6 to the secondary side through the communication port 13a of the communication pipe 13 to generate negative pressure in the valve box 1 (see FIG. 6).

1 Valve box
1a Top face
1b Bottom face
1d Axis 2 Check valve 4 Inlet 3 Inlet valve 5 Outlet 6 Inlet hole
6a Outer port
6b Inner port 8 Valve seat for intake 9 Valve seat for check

Claims (3)

In the valve box, an inflow port is provided at the upper end surface, an outflow port is provided at the lower end surface, and a plurality of intake holes are provided at equal intervals on the concentric circumference of the outflow port. A check valve provided detachably on a check valve seat provided around the inflow port and a concentric double circular intake valve seat surrounding the inner ports of all the intake holes are provided detachably. It is composed of an annular plate-like intake valve urged in the seating direction to the intake valve seat, and each intake hole is formed such that its outer opening is expanded with a predetermined depth and a predetermined chamfer angle. Vacuum breaker to do. The vacuum breaker according to claim 1, wherein the intake hole is a long hole having a circular arc shape or a straight line shape in which a concentric double circular intake valve seat can be surrounded . The vacuum breaker according to claim 1 or 2, wherein the intake hole is formed obliquely toward the inlet with an acute angle with respect to the axis of the valve box .

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