JPH0434358Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application and overview of the invention] The present invention relates to a backflow prevention device for a hot water supply circuit for filling hot water. This prevents the hot water from flowing through the wall surface of the backflow prevention device toward the overflow hole, thereby preventing the hot water from leaking to the outside of the device.

[Prior Art and Problems Therewith] As a bathtub with a water heater equipped with a hot water supply circuit for filling hot water, there is one shown in FIG. 2, for example.

In this case, hot water from water heater A is supplied to bathtub B.
The water is supplied to the communication pipe D between the bathtub C and the bathtub C via the backflow prevention device 1 which is the object of the present application.

The backflow prevention device 1 includes a funnel-shaped hopper 2 with an overflow hole 20 formed in the upper part of the side wall, and a hot water supply hole 3 which is covered with the upper opening of the hopper 2.
A lid-like closing member 3 with a hole 0 drilled therein, and a minute gap 31 below the hot water supply hole 30 of the closing member 3.
The lower end of the nozzle 4 is located at the lower end opening 2 of the hopper 2.
I am facing the 1st.

When hot water is supplied from water heater A, the hot water is
Not only does the hot water flow from the hot water hole 30 of the closing member 3 through the nozzle 4 to the bathtub B side, but also,
The water is ejected from the minute gap 31 formed between the nozzle 4 and the closing member 3, flows down the outside of the nozzle 4, and is supplied to the bathtub B side. Furthermore, after filling the bathtub B with hot water, the upstream water circuit E of the backflow prevention device 1 is
If an unexpected pressure drop occurs in the upstream water circuit E, suction air is supplied from the overflow hole 20 to prevent the hot water in the bathtub B from flowing back to the water supply side.

In this device, when water filling is stopped, air from outside the device is supplied into the nozzle 4 through a minute gap 31, so that water does not remain in the nozzle 4, and the water inside the nozzle 4 is removed at low temperatures such as in winter. has the advantage of not freezing.

However, in the above conventional system, when the speed of filling hot water into the bathtub B is increased, a portion of the hot water supplied from the water heater A flows into the overflow hole 2 of the backflow prevention device 1.
There was a problem with leakage from 0.

This is because, in the above-mentioned conventional system, a part of the supplied hot water is ejected toward the overflow hole 20 from the minute gap 31 formed between the closing member 3 of the backflow prevention device 1 and the nozzle 4 below it. It is from.

That is, in the conventional system described above, when the amount of hot water flowing out from the hot water supply hole 30 of the closing member 3 increases,
A part of the water spouted from the minute interval 31 above the nozzle 4 flows into the overflow hole 2 in the hopper 2.
0 is sprayed onto the upper wall surface of Hopper 2.
It leaks from the overflow hole 20 through the inner surface of the tube.

[Technical Problem] The present invention consists of a hopper 2 having a lower end opening 21 connected to the bathtub B side and an overflow hole 20 formed in the upper side wall, and a hot water supply circuit covered with the upper end opening of the hopper 2. A lid body is provided with a hot water supply hole 30 for discharging hot water flowing into the hopper downward, and the lid body is housed in the hopper 2 with a minute gap 31 placed below the lower surface of the lid body, and is provided coaxially with the hot water supply hole 30. A backflow prevention device for a hot water supply circuit for filling hot water, in which the upper end opening of the nozzle 4 is set larger than the open end of the hot water supply hole 30,
The object is to prevent hot water from leaking from an overflow hole 20 when the speed of filling hot water into a bathtub B is increased, and to simplify the structure of a backflow prevention device.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problems are as follows. The upper end open part of 2 is connected so as to be partitioned by a closing member 3 formed of an elastic flexible membrane, and a cylindrical body 34 having a hot water supply hole 30 penetrated therethrough is protruded downward from the center of this closing member. The diameter of this cylindrical body 34 is set smaller than that of the open upper end of the nozzle 4.

[Function] The hopper 2 equipped with the nozzle 4 and the lid body,
By joining via the closing member 3 provided with the cylindrical body 34, a backflow prevention device is constructed.

In addition, in the backflow prevention device having this configuration, when the hot water that has flowed into the lid is discharged from the hot water supply hole 30 into the nozzle 4, the hot water supply pressure acts on the closing member 3 that partitions the hopper 2 and the empty space inside the lid. However, since the closing member 3 is made of an elastic flexible membrane, it is bent downward by the acting force, and the vicinity of the outer periphery of the cylindrical body 34 closes the minute gap 31 with the upper end of the nozzle 4. .

Therefore, all of the hot water discharged from the hot water supply hole 30 is supplied into the nozzle 4, and does not leak from the hot water supply hole 30 to the overflow hole 20.

When filling with hot water is stopped, the pressure inside the lid decreases, and the closing member 3 is restored to its initial state, forming a minute gap 31 and communicating the top and bottom of the nozzle 4 with the outside. Hot water does not accumulate in the area.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

All of the hot water discharged from the hot water supply hole 30 is supplied into the nozzle 4 and does not leak from the hot water supply hole 30 to the overflow hole 20, so even if the speed of filling hot water into the bathtub B is slowed down, the amount of hot water filled Even if the amount is increased, there is no fear that hot water will leak from the overflow hole 20, and as a result, the time required for filling the hot water can be shortened.

In addition, the configuration for realizing such an effect is
This can be realized by simply joining the hopper 2 and the lid body with the closing member 3 interposed therebetween, and the configuration can be greatly simplified compared to the case where a valve device as disclosed in Japanese Utility Model Application Publication No. 119063/1983 is used.

[Example] Next, an example of the present invention described above will be described in detail with reference to the drawings.

As shown in FIG. 1, the hopper 2 constituting the backflow prevention device 1 has an upper end opening 22, a lower end opening 21, and an overflow hole 20 in the side wall, similar to the conventional one described above. .

The upper end opening of the hopper 2 is covered with a closing member 3 formed of an elastic flexible membrane such as rubber, and the peripheral edge of the closing member 3 is connected to the hopper 2 and a lid 5 that covers it. It is held in a sandwich shape by the

A cylindrical body 34 constituting the hot water supply hole 30 is attached to a through hole 36 bored in the center of the closing member 3, and the lower end of the cylindrical body 34 is inserted into the nozzle 4. There is.

Now, when the hot water supplied from the water heater A side reaches the closing member 3, the fluid pressure of the hot water causes the central part of the closing member 3 formed of an elastic flexible membrane to deviate downstream. As a result, as shown by the imaginary line in FIG. All hot water is supplied into the nozzle 4 and sent to the lower end opening 21 of the hopper 2 through the nozzle 4. As the amount of supplied hot water increases and the hot water filling speed increases, the contact force between the closing member 3 and the nozzle 4 becomes stronger, and the supplied hot water leaks further from the contact portion between the closing member 3 and the nozzle 4. This will make it difficult. In other words, even if the speed of filling the bathtub with hot water becomes faster,
This eliminates the inconvenience that hot water sent to the bathtub for filling the bathtub leaks from the overflow hole 20.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the embodiment of the present invention, and Fig. 2 is an explanatory view of the conventional example.
... Closing member, 4 ... Nozzle, 20 ... Overflow hole, 30 ... Hot water supply hole.

Claims (1)

[Scope of utility model registration request] Hopper 2 with a lower end opening 21 connected to the bathtub B side and an overflow hole 20 bored in the upper side wall
The hopper includes a lid body that covers the open upper end of the hopper 2 and is provided with a hot water supply hole 30 for discharging hot water that has flowed in from the hot water supply circuit downward; a nozzle 4 housed in the hot water supply hole 30 and provided coaxially with the hot water supply hole 30;
In a backflow prevention device for a hot water supply circuit for filling hot water, in which the upper end opening of the nozzle 4 is set larger than the open end of the hot water supply hole 30, the lid body allows hot water to flow into a cavity that opens downward. The lower end open part of the lid body and the upper end open part of the hopper 2 are joined so as to be partitioned by a closing member 3 formed of an elastic flexible membrane, and a hot water supply hole 30 is inserted through the center of this closing member. This backflow prevention device for a hot water supply circuit for filling hot water has a cylindrical body 34 projecting downward, and the diameter of the cylindrical body 34 is set smaller than that of the open upper end of the nozzle 4.