JPH06158696A - Vacuum breaker - Google Patents

Abstract

PURPOSE:To provide a flexible valve member with good responsiveness to a vacuum created on the side of a feed water pipe, to prevent waste water from flowing backward by remarkably reducing the opening of the slit of a rib portion, and to prevent generation of whistling when fresh air is forced to flow in from an air hole as negative pressure is generated within a casing. CONSTITUTION:A bellows portion 17 is expandably formed on the upper portion of the guide wall 21 of a flexible valve member 15, and the guide wall 21 of the flexible valve member 15 can be made to abut to the inverted-cone tapered edge portion 60c of an insertion member 60 with an overlap by means of negative pressure on the side of a feed water pipe. Further, a sealing seat surface 4 which projects toward its center is formed below an air hole 7 formed in the bore of a casing 2, and a lower flange portion 18 having a sealing protrusion 23 which faces above the sealed seat surface 4 and can be made to abut to the sealed seat surface 4 is formed below the bellows portion 17 of the flexible valve member 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum breaker for preventing backflow in a water channel system.

[0002]

2. Description of the Related Art Conventionally, a vacuum breaker is interposed between a water channel system, for example, a flush toilet and a flush valve for ejecting flush water to the flush toilet. This vacuum breaker is, for example, a flush toilet. When a vacuum condition occurs in the water supply water channel due to drainage of water etc.,
When the flush valve is operated, it is installed in order to effectively prevent backflow of the clogged flush toilet sewage into the drinking water supply water channel. As a conventional vacuum breaker, for example, as shown in FIG. There is a structure as shown.

That is, the vacuum breaker 51 has a casing 52 formed in a circular tube shape.
A flange portion 53 is formed on the upper end portion of the protrusion 2 so as to project outward, and a plurality of ventilation holes 54 are formed on the lower peripheral surface side of the flange portion 53. A connecting nut 55 is arranged at the upper end of the casing 52, and the lower end 57 of the flash valve is integrally connected via the connecting nut 55. The flange portion 53 of the casing 52 is placed on a flange portion 55a that is formed so as to project inward at the lower portion of the connecting nut 55, and the skirt portion 56 is integrally formed in a downward shape at the lower portion of the flange portion 55a. Has been done. The skirt portion 56 is arranged outside the ventilation hole 54 at an appropriate interval.
It is intended to prevent foreign matter from flowing into the inside of the container 4. A washing pipe on the flush toilet side is connected to the lower end of the casing 52 via a connecting nut 58 shown by an imaginary line.

A flexible valve member 59 made of rubber or the like is arranged in the casing 52.
9 is a thin-walled side wall 59a vertically arranged with a slight clearance from the inner peripheral surface of the casing 52, and is formed in a slanted shape at a lower portion of the side wall 59a with a thicker wall. A tapered wall portion 59b, a rib portion 59c integrally extending from a bottom end portion of a fold between flat portions of the tapered wall portion 59b toward the axial center of the casing 52, and an upper end portion of the side wall 59a. And a support flange portion 59d that is formed in a protruding shape outward, and this support flange portion 59d is formed with a concave groove 59e on the inside, and the rib portion 59c is provided with an internal groove. A slit is formed between the edges.

An insertion member 60 is arranged at an upper portion of the flexible valve member 59 with the flange portion 60a fitted in the concave groove 59e of the flexible valve member 59. The insertion member 60 is formed of a hard material such as plastic, and is formed in an inverted conical shape. For example, the insertion member 60 extends from the bottom end 60b at the lower end to the flange 60a and is
About several water inlets H are formed vertically.

In the vacuum breaker 51 thus formed, when the cleaning water is introduced into the casing 52 from the flush valve side (not shown) connected to the water supply pipe, the cleaning water passes through the water introduction port H and is flexible. Reaching the valve member 59, the taper wall 5 of the flexible valve member 59 is reached by water pressure.
9b sideways and side walls 59a sideways to bring the side walls 59a into close contact with the ventilation holes 54.
It is possible to satisfactorily prevent water from leaking and to spread the narrow gap of the rib portion 59c to allow water to pass under the casing 52, so that the wash water can be supplied to a wash toilet not shown below.

[0007]

In this conventional vacuum breaker 51, for example, when the water supply pipe side is in a vacuum state for some reason, a siphon action is generated in the casing 52, and the outside air is introduced from the inside of the vent hole 54 into the casing 52. The flexible valve member 59 is introduced into the inside, and the flexible valve member 59 is pressed toward the insertion member 60 side to close the water guide port H, and
Although the slit of the rib portion 59c is closed to prevent sewage or the like flowing back from the flush toilet side, the side wall 59a of the flexible valve member 59 is vertical, so that the negative pressure against When the flexible valve member 59 is pressed against the insertion member 60, the side wall 59a is largely deformed, so that the inverted conical tapered edge portion 60c of the insertion member 60 is generated.
And the tapered wall portion 59b of the flexible valve member 59 do not overlap with each other, a narrow gap of the rib portion 59c may be widened, and sewage may flow back to the water supply pipe side. When wash water flows into the flexible valve member 59 from above, the flow velocity increases in the process of flowing downward through the narrow gap of the rib portion 59c, and a negative pressure is generated in the casing 52. The side wall 59a is pressed from the outside so that the ventilation hole 54
There is a problem that the outside air is sucked into the casing 52 through the passage and a whistling sound is generated when the outside air is sucked.

The present invention has been made to solve the above-mentioned conventional problems. When the vacuum condition occurs on the side of the water supply pipe, the responsiveness of the flexible valve member is good and the gap of the rib portion is small. It is possible to prevent the backflow of sewage by significantly reducing the opening degree of, and also to generate negative pressure in the casing to allow the outside air to flow in through the ventilation holes,
An object of the present invention is to provide a vacuum breaker capable of preventing the whistle blowing sound generated at that time.

[0009]

In order to solve the above-mentioned conventional problems, the present invention has a substantially tubular casing having a ventilation hole on a side surface, and an inverted cone shape having a plurality of water inlets provided in the casing. An insertion member having a tapered edge portion, a guide wall provided below the insertion member and having a substantially inverted conical shape at a lower portion, and a rib portion having a narrow gap at a lower portion of the guide wall and capable of opening and closing are formed. In a vacuum breaker comprising a flexible valve member that passes wash water and prevents water leakage and backflow from the ventilation hole, a bellows portion is formed on the upper side of a guide wall of the flexible valve member so as to be expandable and contractible. And a vacuum breaker configured such that the guide wall of the flexible valve member can overlap and abut on the taper edge of the inverted conical shape of the insertion member by negative pressure on the water supply pipe side of the washing water. Through the inner diameter of A seal seating surface that projects toward the center is formed below the hole, and faces the seal seating surface below the bellows portion of the flexible valve member and abuts the seal seating surface on four sides of the lower surface. It exists in a vacuum breaker configured to form a lower flange portion having a seal ridge that can be contacted.

[0010]

With the above construction, when the water supply pipe side is in a vacuum state and a negative pressure is generated, the bellows portion of the flexible valve member is responsively shortened and the guide wall having a substantially inverted conical shape is inserted. The taper edge of the inverted conical shape is overlapped and abutted to prevent deformation and opening of the slit side of the rib to prevent backflow of sewage. When a negative pressure is generated in the vicinity of the side, the bellows of the flexible valve member responds to the expansion and the sealing ridges of the lower flange come into contact with the seal seating surface of the housing, allowing outside air to enter from the ventilation holes. To prevent the generation of whistling noise.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a vacuum breaker 1, in which a casing 2, a connecting nut 9 and an inserting member 60 can be mounted as in the conventional case. It is composed of a flexible valve member 15.

The casing 2 is formed in a substantially tubular shape, and a lower threaded portion 3 for connecting a cleaning pipe is formed on the outer circumference on the lower side thereof, and the casing 2 has an inner diameter portion at a predetermined position in the centerline C direction. A seal seating surface 4 is formed horizontally toward the top, and an upper threaded portion 6 into which a connecting nut 9 is screwed is screwed on the outer periphery of an upper wall portion 5 of the seal seating surface 4, and
Vent holes 7 are formed through the upper wall portion 5 at a predetermined interval. Further, the flange portion 8 is provided on the inner diameter portion of the upper portion of the lower screw portion 3.
Is formed, and the seal seat surface 4 diameter> the flange portion 8 diameter is formed.

The connecting nut 9 has a screw portion 10 which is screwed into the upper screw portion 6 of the casing 2.
A skirt portion 11 that covers the outside of the ventilation hole 7 of the casing 2 at a predetermined interval is formed below 0.
A screw portion 12 for connecting a water supply pipe is formed on the inner diameter portion on the upper side of the screw portion 10. Further, the insertion member 60 and the flexible valve member 15 similar to the conventional one are provided below the screw portion 12.
A receiving piece 13 having a hook-shaped cross-section for receiving is formed.

Further, the insertion member 60 has a flange portion 60a made of a plastic member as in the conventional case, and guide pieces 60b are disposed in a substantially inverted conical shape at the lower part in three equal positions to form a water inlet H. The flexible valve member 15 is attached to the lower portion of the insertion member 60.

The flexible valve member 15 is made of, for example, rubber, synthetic resin or the like, and the inheritance piece 13 of the connecting nut 9 is used.
Has a mounting flange portion 16 that engages with, a bellows portion 17 is formed in a lower portion of the mounting flange portion 16, and a lower flange portion 18 that faces above the seal seat surface 4 of the casing 2 is formed in the lower portion thereof. As shown in FIG. 2, the lower portion of the lower flange portion 18 has a center line C centered at the lower end.
The ribs 19 are provided at intervals of 20 degrees, and the valleys 20 are provided in the center between the ribs 19 to form a guide wall 21 having a substantially inverted cone shape.
Is formed, and a slit 22 is formed at the center of the rib portion 19 toward the center line C of the flexible valve member 15 so that the slit 22 can be opened when water is passed. Further, a seal projection 23 is continuously formed on the outer periphery of the lower flange portion 18 on the lower surface side, and is provided so as to be able to contact the seal seat surface 4.

In the vacuum breaker 1 thus formed, when the cleaning water is supplied from the water supply pipe side and flows into the flexible valve member 15 through the water inlet H of the insertion member 60, the hydraulic force flows down. The slit 22 of the rib portion 19 is expanded from the center line C, and the washing water is supplied to the flush toilet. When the washing water flows downward through the slit 22, the inside of the casing 2 is flexible. The flow of air becomes faster near the lower part of the sex valve member 15, and a negative pressure is generated near this, and a small amount of outside air is introduced from the ventilation hole 7 of the upper side wall 5 of the casing 2 due to this negative pressure. , Flexible valve member 1
5, the bellows portion 17 is responsively extended by the hydraulic force to flow downward and extends downward, the lower flange portion 18 is displaced downward, and the sealing projection 23 formed on the lower surface of the lower flange portion 18 has the casing 2 It is abutted on the seal seat surface 4 formed on the inner diameter portion of the housing to prevent the outside air from being sucked in, and thus the whistling sound is not generated and the discomfort caused by the whistling sound can be eliminated.

When a vacuum is generated on the water supply pipe side for some reason, outside air is introduced from the ventilation hole 7 of the casing 2 and the outside air tends to deform the flexible valve member 15 from the outside. However, when the bellows portion 17 formed on the flexible valve member 15 is in a vacuum state, the bellows portion 17 is responsively contracted and the guide wall 21 is moved upward, so that the tapered edge 60c of the inverted conical shape of the insertion member 60 is formed. The guide wall 21 is superposed along the guide wall 21 and its deformation is significantly reduced.
It is possible to prevent the deformation of the opening, and to prevent the backflow phenomenon of sewage due to the vacuum state on the water supply pipe side.

Next, FIG. 3 shows a modification. That is,
In the structure shown in FIG. 3, the lower flange portion 18 and the sealing ridge 23 of the flexible valve member 15 are eliminated, and the body portion 15a between the bellows portion 17 and the guide wall 21 is formed to be long. The flexible valve member 15 is formed so that the rib portion 19 at the lower end of 15 reaches the vicinity of the upper surface of the flange portion 8 of the casing 2, and the casing 2 has a seal formed in the lower portion of the vent hole 7. The step projection 4a is formed by further projecting from the seat surface 4 toward the center. Other configurations are similar to those in FIG.

According to this structure, when the cleaning water is supplied from the water supply pipe side and flows into the flexible valve member 15 through the water inlet H of the insertion member 60, the bellows portion 17 exists. However, since the lower end portion of the flexible valve member 15 is close to the flange portion 8, the force that tries to extend downward does not act on the flexible valve member 15, and the hydraulic force of the wash water flowing down is the normal line. The pressure is applied in the direction, the body 15a spreads in the normal direction, and the outer periphery of the body 15a is brought into close contact with the step projection 4a of the casing 2 to prevent the intake of outside air and prevent the generation of whistling noise. You can

If a vacuum occurs on the water supply pipe side for some reason, the bellows portion 17 contracts and the guide wall 21 has an inverted conical shape of the insertion member 60 as in the structure shown in FIG. It is possible to prevent the backflow phenomenon of sewage by being superposed on the tapered edge portion 60c.

[0021]

As described above, according to the present invention, when the water supply pipe side is in a vacuum state and a negative pressure is generated, the bellows portion of the flexible valve member is responsively shortened to have a substantially inverted conical shape. It is possible to prevent the guide wall from overlappingly contacting the inverted conical taper edge portion of the insertion member and deforming the slit side of the rib portion to open so that the reverse flow of sewage can be favorably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a vacuum breaker.

FIG. 2 is a perspective view of a flexible valve member.

FIG. 3 is a sectional view of a vacuum breaker showing a modified example.

FIG. 4 is a sectional view of a conventional vacuum breaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum breaker 2 Casing 4 Seal seat surface 4a Step protrusion 7 Vent hole 15 Flexible valve member 15a Body part 17 Bellows part 18 Lower flange part 19 Rib part 21 Guide wall 22 Small gap 23 Seal convex line 60 Insert member 60c Taper Edge

Claims (3)

[Claims] 1. A substantially tubular casing 2 having a ventilation hole 7 on a side surface thereof, and a plurality of water inlets H provided in the casing 2.
And an insert member 60 having an inverted conical tapered edge portion 60c, a guide wall 21 provided below the insert member 60 and having a substantially inverted conical shape at the lower portion, and the guide wall 2
1. A vacuum formed of a flexible valve member 15 having a slit 22 in the lower part of 1 to form an openable and closable rib portion 19 for passing wash water and preventing leakage and backflow from the vent hole 7. In the breaker 1, a bellows portion 17 is formed on the upper side of the guide wall 21 of the flexible valve member 15 so as to be expandable and contractible, and the guide wall 21 of the flexible valve member 15 is formed by negative pressure on the water supply pipe side of the wash water. A vacuum breaker configured to be capable of overlapping and abutting on the inverted conical tapered edge portion 60c of the insertion member 60. 2. A seal seating surface 4 is formed below the ventilation hole 7 in the inner diameter portion of the casing 2 so as to project toward the center, and the seal seating surface 4 is formed under the bellows portion 17 of the flexible valve member 15. The vacuum breaker according to claim 1, wherein a lower flange portion (18) having a sealing projection (23) facing the seal seating surface (4) is formed on four sides of the lower surface facing the surface (4). 3. A step projection 4 which can be brought into close contact with a body portion 15a below the bellows portion 17 of the flexible valve member 15 when washing water flows down.
The vacuum breaker according to claim 1, wherein a is formed below the ventilation hole 7 in the inner diameter portion of the casing 2 so as to protrude toward the center.