JPH0555759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique for draining liquid from a closed container.

[Prior Art] As shown in FIG.
01 is provided with an atmosphere opening hole 520 that communicates with the atmosphere,
A liquid draining technique is conventionally known in which the liquid 540 in the sealed container 500 is removed by separating the valve body 530 that closes the atmosphere opening hole 520 from the atmosphere opening hole 520.

[Problem to be solved by the invention] However, in such a technique, the airtight container 50
There is a drawback that the liquid 540 is difficult to escape because it is difficult to replace the atmosphere when it enters the inside.

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid draining structure for a closed container, which allows the liquid inside the closed container to be easily drained.

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration.

(1) In a liquid draining structure of a sealed container, in which the liquid in the container is drained by releasing a valve body blocking the atmosphere opening hole provided at the bottom of the container from the inside of the container, the atmosphere opening hole is It consists of an air inlet port that takes in air to replace the liquid, and a liquid outflow port that is vertically downwardly different from the air inlet port.

(2) In a liquid draining structure for a sealed container, in which the liquid in the container is drained by releasing a valve body blocking the air vent hole provided at the bottom of the container from the inside of the container, the air vent hole is It is composed of an air inlet port that takes in air to replace the liquid, and a liquid outflow port that is vertically downwardly different from the air inlet port, and each of the ports is provided at the lower part of the valve body. A hole open to the atmosphere was vertically divided by a partition plate.

[Operation and Effects of the Invention] (Regarding Claim 1) As shown in FIG. It consists of a liquid outlet with a difference. Therefore, the liquid pressure at the liquid outlet becomes higher than the liquid pressure at the air inlet, so that air is taken in from the air inlet and the liquid easily flows out from the liquid outlet.

(Regarding Claim 2) As shown in Figure 3A, with only the structure of Claim 1, in the case of a valve body that is not far from the bottom of a closed container, a film due to surface tension is formed between the valve body and the bottom. In some cases, the liquid may not flow out due to the liquid pressures at each opening being balanced, and the effect of constructing the atmosphere opening hole with two openings, a liquid outlet and an atmosphere inlet, is lost. It is possible that

However, as shown in FIG.
By adding a configuration in which the atmosphere opening hole is vertically divided and formed by a partition plate provided at the bottom of the valve body, the atmosphere opening hole is reliably divided into two openings, and the formation of the above-mentioned membrane is ensured. is prevented. Therefore, the liquid pressure at the liquid outlet is always higher than the liquid pressure at the atmosphere inlet, and the liquid easily flows out from the liquid outlet.

[Example] Next, a backflow prevention device A employing the configuration of the present invention will be described based on FIGS. 1 and 2.

The backflow prevention device 1 shown in FIG.
0, and is used, for example, in an automatic hot water filling system 100 as shown in FIG.

In this hot water filling system 100, an introduction pipe 3 is fixed to the upper end of the main body 2 of the backflow prevention device 1 in a bent state at right angles to the first check valve 10. At the end, there is a hot water heater 10
1 is connected to a hot water supply pipe 102 for supplying hot water.

The first check valve 10 includes a partition plate 13 in an upper valve chamber 12 formed by a valve chamber wall 11 provided to divide the inside of the main body 2 into two and an upstream side of the main body 2. A plunger 14 is arranged. A sealing member 15 for opening and closing the inlet 4 serving as a connecting portion with the introduction pipe 3 is provided on the upper part of the plunger 14 . The partition plate 13 also has an opening 1 through which water flowing in from the inlet 4 passes.
3a is formed. Note that the seal member 15
The area of the partition plate 13 is made sufficiently large relative to the area of the inlet 4 which is opened and closed by the water receiving part 1 bent toward the inlet 4 on the outer periphery of the partition plate 13.
3b, the plunger 14 has good responsiveness to inflowing water.

An atmosphere release hole 11A for communicating with the atmosphere is formed in the valve chamber wall 11 forming the upper valve chamber 12, and a hopper 20 for storing water flowing out from the atmosphere release hole 11A is provided at the bottom of the main body 2. , is formed by the valve chamber wall 11.

The atmosphere release hole 11A is opened and closed by an atmosphere release valve 16 provided at the lower end of the plunger 14. Note that the atmosphere release valve 16 is set to be sufficiently smaller than the partition plate 13 provided on the plunger 14. Here, the atmosphere release hole 11A includes an atmosphere inlet port 11A-1 that takes in air to replace the water accumulated in the upper valve chamber 12, and an atmosphere inlet port 11A-1 that extends vertically downward from the atmosphere inlet port 11A-1. It is composed of a water outlet section 11A-2. The water outlet portion 11A-2 is formed of a cylindrical body 11B having an arc-shaped cross section and having a valve chamber wall 11 protruding vertically downward. Further, 16A is a partition plate that extends downward from the central lower surface of the atmosphere release valve 16, and partitions the atmosphere release hole 11A in the vertical direction.
A-1 and a water outlet portion 11A-2 are formed.

The valve chamber wall 11 is provided with a surrounding wall 17 toward the upper valve chamber 12 for surrounding the atmosphere release valve 16 and slidingly supporting the plunger 14 at the upper end.
a, and the plunger support portion 17a includes:
A communication portion 17b is formed that communicates the upper valve chamber 12 and the atmosphere release hole 11A.

The plunger 14 has a plunger support section 17
A spring 18 is disposed between the plunger 14 and a.
is biased toward the inlet 4, and the inlet 4
When water is not supplied from the inlet 4, the seal portion 15 closes the inlet 4.

Further, here, an atmosphere release valve 16 is provided at the lower end of the plunger 14, and when the inlet 4 is closed, the atmosphere release hole 11A is opened.

Conversely, when water flows in from the inlet 4 and the plunger 14 moves to the lower end, the atmosphere opening hole 11A is closed.

In this way, the inlet 4 and the atmosphere opening hole 11A are reversibly closed to each other, and when one is closed, the other is always open.

In the above configuration, when water starts to flow from the inlet 4, the water that has flowed into the upper valve chamber 12 is ejected from the atmosphere opening hole 11A toward the hopper 20. Atmospheric release valve 1
A force is generated that presses 6 toward the atmosphere opening hole 11A.

In this case, since the atmosphere release valve 16 that opens and closes the atmosphere release hole 11A is disposed within the surrounding wall 17, the direction of the water flow within the surrounding wall 17 tends to be in the direction of the atmosphere release hole 11A.

As a result, the plunger 14 receives a force that attempts to open the inlet 4 by the partition plate 13, and a force that attempts to close the atmosphere release hole 11A by the atmosphere release valve 16, simultaneously and in the same direction. In order to work, the plunger 14 can be quickly moved to the lower end.

Furthermore, since the atmosphere release valve 16 is small, the resistance of the atmosphere release valve 16 to water in the upper valve chamber 12 is reduced. Therefore, when the flow of water from the inlet 4 into the upper valve chamber 12 is stopped, the air release valve 16 is less susceptible to resistance due to the water in the upper valve chamber 12.
The first check valve 10 can be easily closed.

An outflow pipe 12b is formed on the side of the upper valve chamber 12 and serves as an outflow port through which water flowing into the upper valve chamber 12 flows out, and downstream of the outflow pipe 12b, a second
A check valve 30 is connected.

In this embodiment, a hot water filling valve 103 is provided upstream of the introduction pipe 3 of the backflow prevention device 1 in order to stop the supply of hot water from the hot water filling water heater 101. In order to prevent each valve from becoming stuck due to freezing of dripping water and making it impossible to supply hot water thereafter, after the hot water filling valve 103 is closed, the water in the upper valve chamber 12 is replaced with the atmosphere. and naturally falls into the hopper 20, but at this time, since the lower end opening of the water outlet part 11A-2 is lower than the lower end opening of the air inlet part 11A-1 by the height h, the water pressure is applied to the air inlet port 1.
Atmosphere enters from 1A-1, and the water outlet part 11A-
Water accumulated in the upper valve chamber 12 from the hopper 20
leaks inside.

The hopper 20 temporarily stores water flowing out from the upper valve chamber 12 and forms an air chamber 20a communicating with the atmosphere.

Here, an external guide pipe 2 is installed at the middle of the hopper 20 in the height direction to guide the water inside the hopper 20 downward to the outside.
1 is connected, and the tip of the external guide tube 21 forms an external open port 21a that is open to the atmosphere.

As a result, the atmosphere release valve 16 opens into the atmosphere release hole 11A.
When the upper valve chamber 12 is open, the upper valve chamber 12 is communicated with the atmosphere.

A discharge port 22 for discharging water in the hopper 20 is provided at the lower end of the hopper 20.
A discharge pipe 24 equipped with a solenoid valve 23 is connected to the discharge pipe 24 , and the discharge pipe 24 merges with an outflow portion 36 on the downstream side of the second check valve 30 to form an outflow pipe 42 .

The outflow pipe 42 is connected to the suction side of the bathtub circulation pump 104, and after the supply of hot water from the hot water filling device 101 is stopped, the solenoid valve 23 is opened and the water in the hopper 20 is sucked out.

The second check valve 30 has a valve chamber 31 formed downward from the outflow pipe 12b, and inside the valve chamber 31 is a valve body 33 that is supported by a spring 32 and pressed toward the upstream side.
is arranged, and the valve seat 35 is opened and closed by the sealing member 34 of the valve body 33.

Here, in the second check valve 30, even if water flows into the first check valve 10 from the inlet 4, the first check valve 10
Until the plunger 14 of 0 moves to the lower end, that is, while the atmosphere opening hole 11A is not blocked and the pressure inside the outflow pipe 12b is low and the load on the valve body 33 is small, the valve seat 35 is closed and the atmosphere is opened. hole 1
The elastic characteristics of the spring 32 with respect to the load on the valve body 33 are set so that the valve seat 35 opens only when the valve 1A is closed and the pressure inside the outflow pipe 12b increases.

In Fig. 2, 105 is a bath water heater for reheating, 106 is a water level sensor for detecting the water level in the bathtub B, and 107 and 108 are for switching between filling and reheating the water and detecting the water level. It is a two-way valve that opens and closes as needed.

Backflow prevention device 1 of this embodiment having the above configuration
When the hot water filling valve 103 opens and hot water filling begins,
In the first check valve 10, hot water flows into the upper valve chamber 12 from the inlet 4, and a portion of the water flows out and is spouted out from the atmosphere opening hole 11A to the hopper 20.

At this time, inside the surrounding wall 17, the atmosphere opening hole 11
The atmosphere release valve 1 is opened by the force of hot water flowing out from A.
6 moves the plunger 14 downward,
When the water flow pressure from the inlet 4 is low, that is, the inflow flow rate is low and the outlet pipe 12b is not filled with hot water, the atmosphere release valve 16 opens the atmosphere release hole 11A.
can be occluded.

The atmosphere opening hole 11A is closed, and the outflow pipe 12b
When the internal pressure increases, the second check valve 30 opens,
Hot water can be supplied to bathtub B.

Furthermore, in the water supply system that supplies water to the hot water heater 101, when a water outage occurs and water backflows from the bathtub B, the backflow is prevented by the second check valve 30 in the backflow prevention device 1.

At this time, in the event that there is an abnormality in the second check valve 30, the water that has flowed back is discharged from the atmosphere opening hole 11A via the hopper 20 and the external opening 21a to the outside.

Thereafter, when a predetermined amount of hot water is filled in the bathtub, the hot water filling valve 103 is closed and the hot water filling is completed.

Then, the water remaining in the upper valve chamber 12 is replaced with the atmosphere and naturally falls into the hopper 20 through the atmosphere opening hole 11A, and the water remaining in the upper valve chamber 12 freezes, thereby preventing the subsequent hot water. This prevents the tension from becoming loose.

In the present invention, the atmosphere release hole 11A is connected to the atmosphere release valve 1.
Partition plate 16A extending downward from the central lower surface of 6
, the air inlet portion 11 is divided vertically.
A-1 and the water outlet part 11A-2 are formed, and a height difference is provided so that the water outlet part 11A-2 is at the bottom, so the water pressure in the water outlet part 11A-2 is higher than that in the air inlet part. Air is allowed to enter the upper valve chamber 12 from the water outlet 11A-1, and water accumulated in the upper valve chamber 12 is allowed to flow out from the water outlet 11A-2 into the hopper 20, thereby smoothly replacing water with the air. It can be carried out.

In addition, the atmosphere release hole 11A is partitioned together with the atmosphere release valve 16 by the partition plate 16A, and there is always a difference in water pressure. Even in the case of a type that is not far away from the open hole 11A, a film is formed between the atmospheric release valve 16 and the valve chamber wall 11 due to surface tension, and the water pressure is not balanced, so that the pressure inside the upper valve chamber 12 is easily removed. Water can flow out.

Note that even if there is some gap between the partition plate 16A and the inner wall of the cylindrical body 11B, there is no problem because the air inlet port 11A-1 and the water outlet port 11A-2 are reliably separated by the surface tension of the water. There isn't.

In the above embodiment, the discharge pipe of the hopper is equipped with a solenoid valve, but a check valve may be used instead.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a backflow prevention device showing an embodiment of the present invention. FIG. 2 is a schematic diagram showing an automatic hot water filling system using the backflow prevention device of this embodiment. FIG. 3A is an explanatory view for explaining the effect of claim 1, and FIGS. 4 and 3A are explanatory views for explaining the effect of claim 2. FIG. 5 is an explanatory diagram illustrating the conventional technique. In the figure, 11... Valve chamber wall (bottom), 11A... Atmospheric release hole, 11A-1... Atmospheric inlet port, 11A-
2... Water outlet part (liquid outlet part), 12... Upper valve chamber (closed container), 16... Atmosphere release valve (valve body), 16A... Partition plate (partition plate part).

Claims (1)

[Scope of Claims] 1. A liquid draining structure for a sealed container in which the liquid in the container is drained by releasing a valve body blocking an atmosphere opening hole provided at the bottom of the container from the inside of the container, comprising: A liquid draining device for a closed container, characterized in that the hole is constituted by an air inlet port that takes in air to replace the liquid, and a liquid outlet port that is vertically downwardly different from the air inlet port. structure. 2. In a liquid draining structure of a sealed container, in which the liquid in the container is drained by releasing a valve body blocking the atmosphere opening hole provided at the bottom of the container from the inside of the container, the atmosphere opening hole is connected to the liquid. A partition plate comprising an air inlet port that takes in the air to be replaced, and a liquid outlet port that is vertically downwardly different from the air inlet port, and each of the ports is provided at the bottom of the valve body. A liquid draining structure for a closed container, characterized in that a hole for venting to the atmosphere is vertically divided depending on the part.