JPH0720460Y2 - Vacuum breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vacuum breaker for preventing backflow provided in a ball tap, a mixed faucet with a hand shower, or the like.

(Prior Art) In a bowl tap or a mixed faucet with a hand shower for storing toilet flush water, when the main pipe side becomes negative pressure due to rupture or other causes, water in the tank or bathtub A vacuum breaker is provided to prevent water from flowing back to the main side through a water discharge pipe or a shower head (when the shower head hangs down and is immersed in water in a bathtub).

This vacuum breaker normally keeps the water supply pipe isolated from the outside air, while it keeps the water supply pipe communicating with the outside air when the main pipe becomes negative pressure.In general, the vacuum breaker seals based on the pressure change in the water supply pipe. The part is separated from the valve seat of the communication hole. FIG. 6 shows an example of what is considered as the vacuum breaker. Explaining this vacuum breaker with reference to the drawings, 100 is a cylindrical main body portion for forming a through hole for communicating the inside of the water supply pipe with the outside air at a predetermined portion of the water supply pipe, and a float 102 is provided on the main body portion 100. Is installed. As shown in FIGS. 7 and 8, the float 102 includes a rubber seal member 10
4, a positioning member 106 for preventing the rattling by positioning the shaft center of the float 102 to the shaft center of the main body 100, and a fall prevention member for preventing the float 102 from entering the main body 100. 1
08 and, conversely, a retaining member 110 that prevents the float 102 from slipping out of the main body 100. The positioning member 106 has a hollow shaft portion 112 and a blade 114 radially extending from the shaft portion 112, and the tip end surface of the blade 114 is a main body portion.
By abutting on the inner peripheral surface of 100, the shaft center acts so as to be located at the shaft center of the main body portion 100.

The retaining member 110 has a hollow shaft portion 120 and a large-diameter disk-shaped portion 122, and the shaft portion 120 serves as an upper adhesive fitted from below into the hollow shaft portion 112 of the positioning member 112. The disc-shaped portion 122 comes into contact with the valve seat 124 formed in the main body portion 100 to prevent the float 102 from coming off.

On the other hand, the fall prevention member 108 has a shaft portion 116 and projecting pieces 118 extending radially from the shaft portion 116, and the shaft portion 16 of the fall prevention member 1
It is fixed by an upper adhesive fitted in the hollow shaft portion 120 of 10. Further, as is apparent from FIG. 8, the protruding piece 118 is
By contacting the tip end surface of the main body 100, the float 102 is prevented from entering the main body 100.

Thus, in this vacuum breaker, the float 102 is normally lifted by the water pressure in the water supply pipe, that is, the seal member 104 is seated on the valve seat 124, and the inside of the water supply pipe is shut off from the outside air. When the pressure of the pipe becomes negative, the seal member 104 is separated from the valve seat 124 so that the inside of the water supply pipe communicates with the outside air.

(Problems to be Solved by the Invention) As described above, the float 102 of the vacuum breaker needs various functions, and for convenience of assembly,
The float 102 has a structure in which the positioning member 106, the fall prevention member 108, the seal member 104, and the retaining member 110, which have respective functions, are separate structures.

However, by doing so, the number of constituent parts of the float 102 naturally increases, and the number of assembling steps also increases, which increases the cost of the vacuum breaker, and once the float 102 is assembled, for example, a rubber seal is used. Even when the member 104 deteriorates and the sealing function deteriorates, the replacement is troublesome.

(Means for Solving the Problem) The vacuum breaker of the present invention was devised to solve such a problem, and the gist thereof is provided on a water supply pipe extending from the main pipe. A vacuum breaker for preventing backflow by automatically communicating the inside of the water supply pipe with the outside air when the main pipe side has a negative pressure,
A cylindrical main body that forms a through hole for communicating the water supply pipe with the outside air at a predetermined portion, and is disposed in the through hole of the main body so as to be axially slidable with respect to the inner surface thereof. The float has (a) a plurality of positioning pieces extending in a direction perpendicular to the axial center of the main body, and each tip surface of the positioning pieces passes through the main body. A positioning portion for preventing rattling of the float in the direction perpendicular to the axis by slidably abutting the inner surface of the hole; and (b) an axial center located outside the main body in the axial direction. Has an engaging piece extending in a direction perpendicular to the axis from the portion,
An engaging head portion for preventing a float from entering the main body portion by engaging or abutting a tip end portion of the engaging piece with an end portion of the main body portion; and (c) the engaging head portion. Has a large-diameter retaining portion provided on the opposite side, and (d) a seal portion that sits on a valve seat provided on the main body portion to cut off communication, and these positioning portion and engaging head The part, the retaining part, and the seal part are integrally formed of a soft elastic material such as rubber.

(Effect of operation and device) That is, in the vacuum breaker shown in FIGS. 6 to 8, only the seal portion of the float is made of rubber material and the other portions are made of hard material such as plastic. In the present invention, not only the seal portion but also other portions are made of a soft elastic material such as rubber, and these are integrally molded.

According to the present invention, since the float is constructed as a single item, the number of constituent parts of the vacuum breaker is reduced, the number of assembling steps is also reduced, and the cost of the vacuum breaker is reduced. It should be noted that the float does not come off from the main body in the mounted state, but since the whole is made of a soft elastic material, for example, the engaging head is forcibly elastically deformed when assembled to the main body. It can be easily attached to the main body by, for example,

Since it is easy to attach the float to the main body,
Even if the float is deteriorated, it can be easily replaced.

In the vacuum breaker of the present invention, the entire float is attached to the tubular main body in a floating state, and normally the whole float is lifted, but when negative pressure occurs, the whole float retracts. Exercise, that is, move around and introduce atmosphere into the water supply pipe. That is, the atmosphere is not introduced by elastic deformation of only the seal portion, but is introduced by the movement of the entire float.

Therefore, when a negative pressure is generated, a large amount of air can be introduced into the water supply pipe all at once, and the backflow of water from the water supply pipe side to the main pipe side can be reliably prevented.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 5, reference numeral 10 is a ball tap arranged in a low tank for storing toilet bowl cleaning water, and has a water supply pipe 12 extending through a wall of the tank. The water supplied from the main pipe is the water supply pipe 12 and the conduit 18 forming a part of the water supply pipe 12.
(FIG. 3), and then water is discharged into the tank through the water discharge pipe 20 (FIG. 4).

The water supply pipe 12 is provided with an opening / closing valve 16 that shuts off or connects the water passages 14a and 14b, and by such opening / closing operation of the opening / closing valve 16, water discharge into the tank and its shutoff are controlled. Has become. The on-off valve 16 includes a valve seat 22, a seal material 24 as a valve element, a piston 26, and the seal material 24.
And an intermediate member 28 interposed between the piston 26, and the piston 26 is operatively connected to the floating ball 30 via a link mechanism 29. The floating ball 30 is rotatable around a shaft 34 at the tip of the rod 32. When the floating ball 30 is lifted as the water level in the tank rises, the piston 26 is moved through the link mechanism 29 in FIG. The seal member 24 is pushed to the left to seat the seal member 24 on the valve seat 22, and disconnects the communication between the water passages 14a and 14b. That is, the water supply to the water discharge pipe 20 is stopped.

The conduit 18 is provided with a vacuum breaker 34 (Figs. 3 and 4) for communicating the inside of the conduit 18 with the outside air to prevent backflow when the main pipe becomes negative pressure. The vacuum breaker 34 has a cylindrical main body 36 for forming a through hole for communicating the inside of the conduit 18 with the outside air, and a float 38. The main body portion 36 is composed of divided bodies 36a and 36b, and the float 38 is an integrally molded product made of rubber as shown in detail in FIGS. 1 and 2, and is engaged with the positioning portion 40. It is composed of a head portion 42 and a stopper / seal portion 44. The positioning section 40 includes four positioning pieces 46 that extend radially from the axial center.
The axial center of the float 38 is positioned at the axial center of the main body 36 by bringing the tip surfaces of the positioning pieces 46 into contact with the inner surface of the main body 36 (the inner surface of the through hole). That is, the rattling of the float 38 is prevented.

On the other hand, the engaging head portion 42 is provided to prevent the float 38 from completely entering the main body portion 36.
Has 48. These engaging pieces 48 are of a form in which the positioning pieces 46 are extended upward and slightly protruded outward in the radial direction, and the inclined surfaces 52 as guide surfaces are provided on the respective upper surfaces.
Are formed. Then, these engaging pieces 48 are brought into contact with the lower end of the engaging piece 48 by the projecting end surface of the main body portion 36, so that the float 38
It is possible to prevent the sinking of the inside of the main body 36.

On the other hand, the retaining / seal portion 44 is formed in a disc shape having a diameter larger than the diameter of the valve seat 50 (FIG. 2) formed in the main body portion 36, and the upper surface of the disc seat 50 is covered with the valve seat 50. By contacting or separating, the inside of the conduit 18 and the outside air are blocked or communicated. However, during normal water discharge, the valve seat 50 is seated based on the pressure of the water in the conduit 18. The retaining / sealing portion 44 is formed thick and has a certain degree of rigidity, and based on this, the retaining function of the float 38 is prevented.

The float 38 of this example is configured such that the engaging head 42 is elastically deformed while the main body is being deformed.
By inserting into the body 36, the body 36 can be easily incorporated. In this example, therefore, the protrusion amount in the radial direction and the vertical thickness of the engagement piece 48 are relatively small (here, the protrusion amount is 1.2 mm and the thickness is 2 mm), and each engagement piece is Inclined surface 52 as a guide surface on the upper surface of 48
Is formed.

Thus, for the float 38 once incorporated in the main body 36,
Since a strong force for separating this from the main body portion 36 does not act, based on the contact of the engaging piece 48 with the end surface of the main body portion 36,
The sinking of the float 38 is sufficiently prevented.

Although the embodiments of the present invention have been described in detail above, the present invention can be configured in other forms.

For example, in the above example, the seal portion and the retaining portion of the float are shared, but they may be formed separately. At that time, the retaining portion does not necessarily have to be formed in a disc shape.

Further, if the engaging piece is formed continuously with the positioning piece as in the above example, the molding of the entire float is facilitated, which is desirable, but it is also possible to form the engaging piece with the positioning piece. is there.

In addition, the engaging piece can be formed in a disc shape, and the present invention can be applied to a vacuum breaker or the like provided in a mixed faucet with a shower head. In the range which does not deviate from the gist,
It can be configured in various modified forms based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a vacuum breaker according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same vacuum breaker. 3 and 4 are a plan view and a cross-sectional view of a main part of a ball tap including the vacuum breaker, respectively, and FIG. 5 is a front view of the ball tap. FIG. 6 is a partially cutaway front view showing a conventional vacuum breaker attached to a ball tap, FIG. 7 is an exploded perspective view of the vacuum breaker of FIG. 6, and FIG. 8 is a sectional view of the same vacuum breaker. is there. 12: Water supply pipe, 34: Vacuum breaker 36: Main body, 38: Float 40: Positioning part, 42: Engaging head 44: Stop and seal part 46: Positioning piece, 48: Engaging piece 50: Valve seat

Claims (1)

[Scope of utility model registration request] 1. A water supply pipe extending from a main pipe,
A vacuum breaker for preventing backflow by automatically communicating the inside of the water supply pipe with the outside air when the main pipe side has a negative pressure, and forming a through hole for communicating the water supply pipe with the outside air at a predetermined portion. And a float disposed in the through hole of the main body so as to be slidable in the axial direction with respect to the inner surface thereof. By having a plurality of positioning pieces that extend in the direction perpendicular to the axis from the axial center portion, and by making the respective tip surfaces of these positioning pieces slidably contact the inner surface of the through hole of the main body in the axial direction A positioning part for preventing rattling of the float in the direction perpendicular to the axis; and (b) an engaging piece located outside the main body in the axial direction and extending in the direction perpendicular to the axis from the axial center. By engaging or abutting the tip portion of the joint piece with the end portion of the main body portion, it is possible to prevent the float from entering the main body portion. An engaging head portion to be stopped, (c) a large-diameter retaining portion provided on the opposite side of the engaging head portion, and (d) a valve seat provided on the main body portion is seated for communication. A vacuum breaker characterized in that it has a breaking seal portion, and that the positioning portion, the engaging head portion, the retaining portion, and the sealing portion are integrally formed of a soft elastic material such as rubber.