JPH076573U - Vacuum breaker - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the flow resistance of vacuum breakers. [Structure] An inner cylinder 2 is fitted into an outer cylinder 1 so that a lower end portion of the inner cylinder 2 can have a backflow preventing posture and a forward flow allowing posture.
The water valve body 10 is rotatably provided. [Effect] Since the valve body for water passage takes a posture in which the valve plate surface is parallel to the water flow during water passage, the water passage resistance is small.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vacuum breaker provided in the middle of a water supply pipe, and more particularly to a vacuum breaker improved to reduce water resistance.

[0002]

[Prior art]

 A vacuum breaker may be installed in the middle of the water supply pipe, for example, the water supply pipe to the toilet bowl. This vacuum breaker is provided so that water does not flow backward in the pipe when the pressure in the pipe becomes negative. FIG. 6 is a front view of a toilet water supply pipe equipped with a conventional vacuum breaker.

A flush valve 22 is provided in the middle of the water supply pipe 21, and a vacuum breaker 24 is provided below the flush valve 22. A central portion of a lever 25 arranged in the vacuum breaker 24 is rotatably supported by a horizontal support shaft 27. A water passage valve 28 and a ventilation valve 29 are provided at both ends of the lever 25. The water passage valve 28 is seated on the water passage valve seat portion 31, and the ventilation valve 29 is seated on the ventilation valve seat portion 32.

When the lever 22a of the flash valve 22 is operated to flow water, the water pushes down the water passage valve 28 to open the water passage. At this time, the ventilation valve 29 on the opposite side of the water passage valve 28 is pushed up across the horizontal support shaft 27, and is seated on the valve seat portion 32 to close the ventilation system passage.

When the inside of the pipe 21 upstream of the vacuum breaker 24 becomes a negative pressure, the water passage valve 28 in the vacuum breaker 24 is sucked up and is seated on the valve seat 31 at the upper side to close the water passage. The backflow of water in the water supply pipe 21 is prevented.

At this time, the ventilation valve 29 on the side opposite to the water passage valve 28 is pushed down, and is separated from the upper valve seat portion 32 to open the ventilation system passage. Therefore, atmospheric pressure is introduced into the pipe 21 on the downstream side of the vacuum breaker 24, and the reverse flow of water in the pipe 21 on the downstream side of the vacuum breaker 24 is prevented.

[0007]

[Problems to be solved by the device]

 In the above-mentioned conventional vacuum breaker, the water flowing in from the upstream hits the water flow valve 28, so that a large water flow resistance was generated.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a vacuum breaker having a small water flow resistance.

[0009]

[Means for Solving the Problems]

 The vacuum breaker of the present invention is a vacuum breaker installed in the middle of a pipe. An inner cylinder, which is arranged inside of the inner cylinder and whose upper part is watertightly connected to the outer cylinder over the entire circumference, a gap provided between at least a lower part of the inner cylinder and the outer cylinder, and the outer cylinder. A first opening that is provided on the surface of the inner cylinder that faces the space and that communicates the space with the outside, and a surface of the inner cylinder that faces the space. A second opening communicating with the inside, a posture that is arranged vertically in the gap, and is in contact with the inner peripheral surface of the outer cylinder to close the first opening; An aeration valve body that can take a posture in which the second opening is closed by being in contact with an outer peripheral surface, and is provided at a lower end portion of the inner cylinder. The valve seat for seating the check valve and the backflow preventive posture, which is provided at the lower end of the inner cylinder, is seated on the valve seat and the forward flow allowance posture separated from the valve seat. In order to be able to take, it is provided with a valve body for water passage rotatably installed around a horizontal spindle.

[0010]

[Action]

 In the vacuum breaker of the present invention, the water passage valve body has a posture in which the valve body plate surface is parallel to the water flow during water passage, so that the water passage resistance is extremely small.

When a negative pressure occurs in the pipe upstream of the vacuum breaker, the water passage valve body is seated on the valve seat portion, and the second opening of the inner cylinder is closed by the ventilation valve body. R. This prevents backflow of water upstream of the vacuum breaker.

Further, when a negative pressure is generated in the pipe upstream of the vacuum breaker in this way, the ventilation valve body opens the second opening of the outer cylinder. Therefore, atmospheric pressure is introduced into the pipe downstream of the vacuum breaker, and backflow of water in the pipe downstream of the vacuum breaker is prevented.

[0013]

【Example】

 Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional perspective view of a vacuum breaker according to the first embodiment, and FIGS. 2 and 3 are vertical cross-sectional views of the first embodiment when the water valve is seated and when the water valve is separated.

In this vacuum breaker, as shown in FIGS. 1 and 2, an inner cylinder 4 is provided on a step portion 2 provided on the inner peripheral surface of an outer cylinder 1 via a ventilation valve body 3 made of synthetic rubber or the like. Is watertightly fitted inside. A space 5 is formed between the outer cylinder 1 and the lower half of the inner cylinder 4. The outer cylinder 1 has a first opening 6 in the space 5 for communicating the space 5 with the outside (atmosphere side) of the outer cylinder 1. Further, the inner cylinder 4 also has a second opening 7 in the space 5 for communicating the space 5 with the inside of the inner cylinder 4 (inside the pipe).

The ventilation valve body 3 has a substantially cylindrical shape. The lower end portion of the valve body 3 is tapered so as to be narrowed inward, and the lower end portion is configured to come into contact with and separate from the outer peripheral surface of the lower portion of the inner cylinder 4. Further, the lower portion of the ventilation valve body 3 can also come into contact with and separate from the inner peripheral surface of the outer cylinder 1. When the pressure inside the inner cylinder 4 (inside the pipe) becomes larger than the pressure outside the outer cylinder 1 (atmosphere side), the diameter of the lower end portion of the outer cylinder 1 expands and comes into contact with the inner peripheral surface of the outer cylinder 1. On the contrary, when the internal pressure of the pipe becomes lower than the atmospheric pressure, the lower part of the valve body 3 separates from the inner peripheral surface of the outer cylinder 1 and contacts the outer peripheral surface of the inner cylinder 4.

At the lower end of the inner cylinder 4, valve seat portions 8 and 9 are provided. A water passage valve body 10 is pivotally supported at a lower portion of the inner cylinder 4 by a horizontal support shaft 12. The packing 11 of the water valve element 10 (backflow prevention valve) is seated on the valve seat portion 8 from below and seated on the valve seat portion 9 from above. The water valve body 10 is urged by a weight 10W provided at the right end of the figure so as to assume a backflow preventing posture in which it is seated on the valve seat portions 8 and 9.

The horizontal support shaft 12 is provided at a position closer to the weight 10 W side than the center of the valve body 10. Therefore, when water flow pressure is applied from above, the water passage valve body 10 assumes a forward flow allowing posture with the valve body plate surface in the vertical direction as shown in FIG. Reference numeral 13 is a stopper, which is provided to prevent the water valve body 10 from rotating about the support shaft 12 by 90 ° or more.

Reference numerals 14 and 15 are a female screw portion and a male screw portion which are threaded on the outer cylinder 1, and are used when the vacuum breaker is attached to a pipe. 16 is a packing.

The operation of the vacuum breaker having such a configuration will be described. When the water is stopped, as shown in FIGS. 1 and 2, the lower end portion of the ventilation valve body 3 is in contact with the outer peripheral surface of the inner cylinder 4, and the opening 7 provided in the inner cylinder 4 has the same opening. Closed by 3. Further, the water passage valve body 10 is biased by the weight 10W so as to take a backflow preventing posture, and is seated on the valve seat portions 8 and 9 of the inner cylinder 4.

When the inside of the pipe on the upstream side of the vacuum breaker becomes negative pressure, the ventilation valve body 3 strongly adheres to the outer peripheral surface of the inner cylinder 4, and the opening 7 is closed. Further, the water passage valve body 10 is strongly pressed against the valve seat portions 8 and 9. Due to the action of the valve elements 3 and 10, the inflow of water or air to the upstream side is blocked. Further, since the ventilation valve body 3 is separated from the inner peripheral surface of the outer cylinder 1, atmospheric pressure is introduced to the downstream side of the vacuum breaker through the opening 6. For this reason, it is possible to prevent water from flowing back in the pipe on the downstream side of the vacuum breaker.

When water flows from above in the drawing, water pressure acts on the ventilation valve body 3 through the opening 7 of the inner cylinder 4, and the valve body 3 is pressed outward. Therefore, the ventilation valve body 3 separates from the inner cylinder 4 and contacts the inner peripheral surface of the outer cylinder 1 to close the opening 6 to prevent water from flowing out of the outer cylinder 1.

Further, the water flow valve body 10 is rotated by the flowing water pressure from above, and as shown in FIG. 3, the side having a larger area with respect to the support shaft 12 is on the lower side, and the weight 10W side is on the upper side. Take a normal flow permitting attitude. At this time, since the valve body plate surface of the water passage valve body 10 is parallel to the water flow direction, the water passage resistance becomes extremely small.

Next, a second embodiment of the vacuum breaker of the present invention will be described with reference to FIG. 4 (when the water break valve of the vacuum breaker is seated) and FIG. 5 (when the water break valve is separated). FIG. 4 (b) is a sectional view of the inner cylinder 4a taken along the line BB in FIG. 4 (a). The same members as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, the lower portion of the inner cylinder 4a has a horizontal wall 4g and a vertical wall 4h to reduce the cross-sectional area of the water passage portion thereof, and has a substantially D-shaped horizontal cross-sectional shape. ing. A water passage valve body 10a is pivotally supported by a support shaft 12 at the lower end of the vertical wall 4h. The lower end surface of the inner cylinder 4a is a valve seat portion 8a, and a packing 11a integrally provided on the water passage valve body 10a can be seated thereon. A weight 10W for urging the packing 11a so as to press the packing 11a against the valve seat portion 8a is provided at an end portion of the water passage valve body 10a.

The operation of the second embodiment of the vacuum breaker having such a configuration will be described. When the pressure in the pipe upstream of the vacuum breaker becomes negative, the ventilation valve body 3 closes the opening 7 by strongly adhering to the inner peripheral surface of the inner cylinder 4a, as in the first embodiment. The water passage valve body 10a takes a backflow prevention posture in which it is strongly pressed against the valve seat portion 8a. Further, atmospheric pressure is introduced to the downstream side of the water passage valve body 10a through the opening 6, and backflow in the pipe downstream of the vacuum breaker is blocked.

At the time of water passage, the ventilation valve body 3 closes the opening 6 of the outer cylinder 1, and the water passage valve body 10a rotates 90 ° around the support shaft 12 to take a forward flow allowable posture, as shown in FIG. At this time, the rear portion of the water passage valve 10a contacts the outer surface of the vertical wall 4h and does not rotate any more. In this water-passing state, the plate surface of the valve body 11a is parallel to the water flow direction, so that the water-passing resistance is small.

[0027]

[Effect of device]

 As described above, in the vacuum breaker of the present invention, since the water passage valve element that is rotatably installed around the horizontal support shaft has a posture in which the valve body plate surface is parallel to the water flow during water passage. , The water flow resistance is extremely small.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional perspective view of a vacuum breaker according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the first embodiment when water is stopped.

FIG. 3 is a vertical cross-sectional view of the first embodiment during water passage.

FIG. 4 is a vertical sectional view of the second embodiment when water is stopped.

FIG. 5 is a vertical cross-sectional view of the second embodiment during water passage.

FIG. 6 is a front view showing a conventional vacuum breaker.

[Explanation of symbols]

 1 Outer cylinder 3 Ventilation valve body 4, 4a Inner cylinder 8, 8a, 9 Valve seat part 10, 10a Water passage valve body 11, 11a Packing 12, 12a Support shaft

Claims (1)

[Scope of utility model registration request] 1. A vacuum breaker installed in the middle of a pipe, wherein an outer cylinder is installed in the middle of the pipe with the cylinder axis direction being the vertical direction; and is arranged inside the outer cylinder with the cylinder axis direction being the vertical direction An inner cylinder whose upper part is watertightly connected to the outer cylinder over the entire circumference; a space provided between at least a lower part of the inner cylinder and the outer cylinder; and in the space of the outer cylinder. A first opening provided on a surface facing the void and connecting the void to the outside; a first opening provided on a surface facing the void of the inner cylinder, communicating the void with the inside of the inner barrel A second opening, which is arranged vertically in the space, is in contact with the inner peripheral surface of the outer cylinder and closes the first opening, and is in contact with the outer peripheral surface of the inner cylinder. And a vent valve body that can assume a posture in which the second opening is closed; for seating a check valve provided at the lower end of the inner cylinder A valve seat portion; a horizontal support shaft which is provided at a lower end portion of the inner cylinder so as to have a backflow prevention posture seated on the valve seat portion and a forward flow allowable posture separated from the valve seat portion; A vacuum breaker comprising a water passage valve body rotatably installed in the.