JP2000145992A - Check valve and water discharge structure for bath tub water receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve capable of surely preventing a reverse flow and also cutting off even the circulation of gas. SOLUTION: In a check valve 18 having a float valve element 19 disposed in a float room 4 and adapted to prevent the reverse flow of fluids from a downstream to an upstream, the float bottom surface of the float valve element 19 is seated on an outflow port 8, and the size of the float bottom surface is larger than the sectional area of the outflow port 8. Thus, since the float valve element 19 is seated around the outflow port 8 to close the same in a usual standby state, the circulation of gas is cut off. Regarding a reverse flow, since the float valve element 19 is raised according to the entering amount of reverse flowing water and a inflow port 12 is closed soon, the reverse flow is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve capable of preventing backflow of liquid and shutting off any flow of gas from upstream or downstream. It relates to the drainage structure of the bathtub water receiver used.

[0002]

2. Description of the Related Art Conventionally, as a check valve, a fluid such as water flowing from an upstream side to a downstream side is passed therethrough, and a fluid such as water flowing back from a downstream side to an upstream side is blocked. 4 to 6 include a spherical type, a bulk type, and an inverted shape shown in FIGS. Each of these check valves 1 to 3 has a float valve element 5 to 7 arranged in the float chamber 4, and an annular seating portion 9 is provided on the outlet 8 side. The seat portion 9 is supported by a plurality of support members 10 from around the outlet 8. When water or the like flows from the upstream side to the downstream side, the float valve bodies 5 to 7 are driven by the force of the fluid. The seat is pressed against the annular seating portion 9 to secure a predetermined gap (flow path) 11 between the annular seating portion 9 and the outflow port 8 (see FIGS. 4 to 6A). Therefore, fluid such as water enters the float chamber 4 from the inflow port 12 and the float valves 5 to 7 in the seated state.
The fluid flows into the outlet 8 through the flow path 11 formed between the fluid and the outlet 8, and is discharged downstream.

On the other hand, when a fluid such as water flows backward from the downstream side, as shown in FIGS. 4 to 6B, the float valve element 5
7 are pushed up, and a part of the upper portions of the float valve elements 5 to 7 closes the inflow port 12 to prevent backflow.

Conventionally, such check valves 1 to
Numeral 3 is used in a device shown in FIG. 7 for draining a water receiver of a bathtub device having a function of recirculating bathtub water. The bath tub device with the circulation reheating function is equipped with a reheating tank in the middle of the system for circulating the bath water, and when the temperature of the bath water drops, the bath water is circulated and reheated by the reheating tank. Warm to the desired temperature. The connection between the circulation path and the bathtub 13 is made by a metal fitting 14 attached to a circulation port of the bathtub 13. However, the mounting bracket 14 must be mounted through the circulation port from inside the bathtub 13 after the installation of the bathtub 13, and the mounting may be insufficient, and there is a risk of water leakage.

[0005] Therefore, conventionally, even if a leak occurs, a water receiver 15 is installed below the circulation port mounting bracket 14 so that the water can be drained, and the drainage trap 17 is provided to a drain trap 17 on the lower surface of the washing place 16. Communication was established. Further, any one of the above-described check valves 1 to 3 is disposed in the middle thereof so that the backflow does not occur from the drain trap 17 side to the water receiver 15 side.

[0006]

However, in the case of the conventional check valves 1 and 2 shown in FIGS. 4 and 5, since the shape of the float valve bodies 5 and 6 are spherical or conical, they are not shown in FIG. As shown in each figure (B), when the fluid such as water flows backward, the float valve bodies 5 and 6 fluctuate, and the accuracy of maintaining the center is poor, and the inflow port 12 and the float valve bodies 5 and 6 Joint (seated posture) was sometimes distorted. Therefore, a gap may be partially formed between the inflow port 12 and the float valve bodies 5 and 6, and the backflow may not be completely prevented in some cases. This was remarkable when the pressure of the fluid flowing backward was very small.

In the case of the conventional check valve 3 shown in FIG.
As shown in FIG. 3B, since the float valve element 7 is of an upside down type, dirt from the upstream side adheres to the upside down portion, and when the float valve body 7 is joined to the inflow port 12, the surrounding area becomes short. In some cases, a gap was formed in the portion, and the backflow could not be prevented.

Further, in each of the above-mentioned conventional check valves 3, the float valves 5 to 7 themselves do not function as floats for the flow of gas, and the gas flows freely.

[0009] Therefore, there is a problem in such a backflow prevention function, and the conventional non-return valves 1 to 1 that allow gas to flow freely.
7 using the tub 3 in FIG. 7, the sewage from the drain trap 17 passes through the check valves 1 to 3 and receives the water from the tub 15.
There is a risk of overflowing and overflowing, causing the floor and the like between the back side of the bathtub 13 and the building frame to rot. In addition, the steam from the drain trap 17 during bathing freely passes through the check valves 1 to 3 and flows out of the water receiver 15 to the back side of the bathtub 13, thus also removing the floor between the building frame and the like. There was the problem of moistening.

In a region where there is a risk of freezing, such as a cold region, a heat insulating material is wrapped around a water trapping member such as the drain trap 17 so that the water sealed in the trap is not frozen. However, due to the cool air transmitted to the back side of the bathtub 13 through the wall surface of the building frame and the cool air transmitted by the heat transfer from the circulation system path to the bathtub 13 with the circulation pot, the air between the back side of the bathtub 13 and the building frame is generated. The cold air passes through the check valves 1 to 3 and freezes the water sealed in the drain trap 17, possibly damaging the drain trap 17.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems and has been improved and eliminated. The check valve can surely prevent a backflow and can also shut off gas flow. And a drainage structure for receiving a bath water from the bath.

According to the first aspect of the present invention, there is provided a valve for arranging a float valve in a float chamber to prevent backflow of fluid from a downstream side to an upstream side. The check valve has a structure in which a float bottom surface of the float valve body can be seated at an outlet, and a size of the float bottom surface is larger than a cross-sectional area of the outlet. Normally, the flow of gas is shut off because the float valve plugs the outlet. Further, with respect to the backflow, the float valve body rises according to the amount of inflow of the backflow water, and eventually closes the inflow port, so that the backflow can be prevented.

According to a second aspect of the present invention, the water receiving and drainage traps of the circulation port mounting bracket outside the bathtub are connected by piping, and the check valve according to the first aspect is disposed between the two. It is a drainage structure of a bathtub water receiver. In addition to the backflow prevention function, the flow of gas can be shut off, so that water vapor spills from the drain trap side to the backside of the bathtub, and cool air on the backside of the bathtub enters the drainage trap and freezes the sealed water. Not even.

According to a third aspect of the present invention, there is provided a check valve according to the first aspect of the present invention, wherein a water receiver of a circulation port mounting bracket outside the bathtub and a bathroom washing place are connected by piping. It is a drainage structure of the bathtub water receiver which has been characterized. In the present invention, the steam in the bathroom does not flow to the back of the bathtub, and the cool air on the back of the bathtub does not flow into the bathroom.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the embodiments of the invention shown in the drawings. The same reference numerals as those in the conventional case denote the same members. FIG. 1 is a schematic longitudinal sectional view showing a check valve 18 according to one embodiment of the present invention, and FIG. 1 (A) is a longitudinal sectional view in a standby state.
FIG. 7B is a longitudinal sectional view at the time of backflow. The check valve 18 according to this embodiment is set so that the area of the bottom surface of the float valve body 19 is larger than the opening area of the outflow port 8, and the float valve body 19 is in the standby state. The bottom surface is seated on the outlet 8 to close it. A plurality of wing members 20 are radially mounted around the float valve element 19. The wing member 20 includes the float valve body 1
When it is inclined, it joins with the inner peripheral surface of the float chamber 4 to prevent the misalignment, and has a self-aligning action. Further, the fluid can pass between the wing members 20. A rubber packing 21 is attached to the upper surface of the float valve body 19 so that the rubber valve 21 can be in close contact with the surrounding ceiling of the inflow port 12 and can be closed at the time of backflow.

When the check valve 18 thus configured is in a standby state, the bottom surface of the float valve body 19 sits on the outflow port 8 and closes it, as shown in FIG. are doing. Therefore, it is possible to cut off the gas flow. The weight of the float valve body 19 serves as a weight for blocking the inflow of the gas flowing into the float chamber 4 from the outlet 8. What is necessary is just to determine the weight. Inlet 12
In the case of gas flowing into the float chamber 4 from above, its pressure acts so as to press the bottom surface of the float valve body 4 against the outlet 8, so that it is not necessary to particularly consider the weight.

When a liquid such as water flows into the float chamber 4 from the inflow port 12 from such a standby state, the float valve 1
Numeral 9 generates buoyancy in accordance with the amount of water accumulated in the float chamber 4 and rises to open the outlet 8. Therefore, water is discharged from the float chamber 4 through the outlet 8. After that,
The float valve body 19 repeats ascending, and discharges water similarly.

At the time of backflow of water or the like, as shown in FIG. 2B, the float valve body 19 rises due to the rise in the water level of the water flowing backward from the outlet 8 into the float chamber 4 and entering the float chamber 4. The rubber packing 21 comes into close contact with the periphery of the inflow port 12 and closes it. Therefore, the water loses its place and the backflow is prevented.

FIG. 2 shows a check valve 22 according to another embodiment of the present invention. The check valve 22 has a rubber packing 21 disposed on the bottom surface of the float valve body 19. Therefore, in the standby state, the rubber packing 21 adheres to the periphery of the outflow port 8 due to its own weight of the float valve body 19 and closes it. The other configuration and operation and effect are the same as those in the case shown in FIG. 1 described above, and description thereof will be omitted.

FIG. 3 shows a case where the check valve 18 or 22 shown in FIGS. 1 and 2 of the present invention is applied to a drainage structure of a bathtub water receiver, and FIG. Drainage channel 23
(B) is a schematic longitudinal sectional view when the drainage passage 23 of the water receiver 15 is connected to the bathroom washing place 16. As shown in FIG.
By arranging the check valve 18 or 22 which is excellent in the check valve function and can shut off the gas flow in the middle of the drainage passage 23, the sewage from the drain trap 17 causes the check valve 18 or 22 to pass through. It does not flow back to the water receiver 15 after passing through.
Therefore, a problem such as the floor between the back side of the bathtub 13 and the building frame being rotten by backflow water cannot occur. Further, the steam from the drain trap 17 during bathing does not pass through the check valve 18 or 22 and escapes to the water receiver 15 side, and there is no problem such as wetting the back side of the bathtub 13. This means that even in a region where there is a risk of freezing, such as in a cold region, the cold air transmitted to the back side of the bathtub 13 through the wall surface of the building frame causes a gap between the backside of the bathtub 13 and the building frame. Even when the air is cooled, the flow of the cool air is controlled by the check valve 1.
8 or 22, the drain trap 17
The water does not flow to the side, and damage due to freezing of the sealed water in the drain trap 17 cannot occur.

This is the same in the case of the drainage structure of the bathtub water receiver shown in FIG. That is, the backflow of water from the bathroom washroom 16 can be reliably prevented, and the bathroom washroom 1
Backflow of steam from 6 and bathroom washroom 16 from the back of the bathtub
It is possible to reliably prevent cold air from entering the air.

[0022]

As described above, in the present invention,
A float valve body is arranged in the float chamber to prevent the backflow of fluid from the downstream side to the upstream side. Since the cross-sectional area is larger than the outlet, in a normal standby state, the float valve body sits around the outlet and closes the outlet. Therefore, the flow of gas is shut off. Further, with respect to the backflow, the float valve body rises according to the amount of inflow of the backflow water, and eventually closes the inflow port, so that the backflow can be prevented.

In the present invention, the water receiver and the drain trap of the circulation port mounting bracket outside the bathtub are connected by piping, and the above-mentioned check valve is disposed in the middle of the pipe. As a result, in addition to the backflow prevention function, the flow of gas can be shut off, so that water vapor spills from the drain trap side to the back of the bath tub, and cool air on the back side of the bath tub enters the drain trap to seal water. Also does not freeze.

Further, according to the present invention, the water receiver of the circulation port mounting bracket outside the bathtub and the bathroom washing place are connected by piping, and the above-mentioned check valve is disposed in the middle thereof. In the case of the present invention, in addition to the backflow preventing function, the vapor in the bathroom does not flow to the back of the bathtub, and the cool air on the back of the bathtub does not flow into the bathroom.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a check valve according to one embodiment of the present invention, and FIG. 1 (A) is a longitudinal sectional view in a standby state;
FIG. 7B is a longitudinal sectional view at the time of backflow.

FIG. 2 is a schematic longitudinal sectional view of a check valve according to another embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a drainage structure of a bathtub water drainage to which the check valve according to the present invention is applied, and FIG. 3 (A) is provided in the middle of a drainage passage connecting a water sink and a drainage trap. In this case, FIG. (B) shows a case where the device is provided in the middle of a drainage system connecting the water receiver and the bathroom washroom.

4A and 4B show a conventional spherical check valve, wherein FIG. 4A is a vertical cross-sectional view during normal operation, and FIG. 4B is a vertical cross-sectional view during reverse flow.

5A and 5B show a conventional bulk type check valve. FIG. 5A is a vertical cross-sectional view at normal time, and FIG. 5B is a vertical cross-sectional view at reverse flow.

6A and 6B show a conventional inverted upside-down check valve, in which FIG. 6A is a vertical cross-sectional view at normal time, and FIG. 6B is a vertical cross-sectional view at reverse flow.

FIG. 7 is a schematic longitudinal sectional view showing a conventional drainage structure of a bathtub water receiver.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 4 ... Float room 8 ... Outlet 12 ... Inlet 13 ... Bathtub 14 ... Circulation port mounting bracket 15 ... Water receiver 16 ... Bathroom washroom 17 ... Drain trap 18 ... Check valve 19 ... Float valve body 20 ... Wing member 21 Rubber packing 22 ... check valve 23 ... drainage passage

Claims (3)

[Claims] 1. A valve body for disposing a float valve body in a float chamber to prevent a backflow of fluid from a downstream side to an upstream side.
A check valve characterized in that the float bottom surface of the float valve body can be seated on the outlet, and the size of the float bottom surface is larger than the cross-sectional area of the outlet. 2. A bathtub water receiver according to claim 1, wherein a water receiver of a circulation port mounting bracket outside the bathtub and a drain trap are connected by piping, and the check valve according to claim 1 is disposed in between. Drainage structure. 3. A bathtub water receiver, wherein the water receiver of the circulation port mounting bracket outside the bathtub and the bathroom washing place are connected by piping, and the check valve according to claim 1 is disposed in the middle thereof. Drainage structure.