JPH0247328Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a check valve, and more particularly to a check valve used to prevent backflow in a pipe that allows liquid to naturally flow.

<Prior art> Conventional check valves open only when the flow pressure of the liquid flowing in the pipe line is greater than the spring force that biases the valve body in the closing direction, and otherwise closes due to the spring force. It is common to do so.

Therefore, in a conduit where the direction of flow of liquid flowing through the conduit changes due to a difference in specific gravity due to a change in temperature, the above-mentioned check valve cannot reliably open and close. For example, even if piping is installed at the entrance of a pipe or in the middle of a pipe that allows bath water to circulate or naturally flow due to temperature changes, such as in an outer pot type bathtub, it cannot be used as a check valve to prevent backflow of bath water. It is something. Therefore, there is a temperature difference between the bath water temperature in the outer pot installed outside the bathtub and the bath water temperature inside the bathtub, and this temperature difference causes a backflow of bath water.
That is, it is impossible to prevent the natural flow of bath water from the outer pot to the bathtub, and there is a risk that the temperature of the bath water in the bathtub will drop.

<Problems to be solved by the invention> The problems to be solved by the invention are not only for pipes having a flow pressure, but also for pipes in which the direction of flow changes forward or backward due to the difference in specific gravity, so-called flow pressure. To provide a check valve that can operate reliably even in a conduit that is in a state where it is difficult to open and close, and can prevent backflow of liquid.

<Means for solving the problem> The technical means taken by the present invention to solve the above problem is to horizontally suspend a pivot passing through the axis of the cylindrical valve box and at right angles to the axis; A pair of upper and lower valve bodies are mounted on a pivot so that they can swing open and close, respectively, facing one side of the opening of the cylindrical valve box, and the specific gravity of the upper valve body is smaller than the specific gravity of the flowing liquid, and the lower valve body The reason is that the specific gravity of the fluid is greater than that of the flowing liquid.

<Function> The present invention consists of an upper valve element having a specific gravity smaller than the specific gravity of the flowing liquid, which is pivoted in the cylindrical valve box so as to be able to swing open and close toward one side of the opening of the cylindrical valve box. This closes the upper side area of the axial center of the cylindrical valve box, which becomes a conduit, and also closes the lower side area of the axial center of the cylindrical valve box with the lower valve element, which has a specific gravity greater than the specific gravity of the flowing liquid. By closing the pair of upper and lower valve bodies, liquid flow from the reverse direction is prevented.

〈Embodiment〉 Figures 1 to 5 show a first embodiment of the check valve of the present invention, and the check valve main body A has an outer hook 1 on the outer periphery of the other end of the opening of the cylindrical valve box _A1 . A fitting flange 4 that fits and fixes into a mounting hole 3 drilled in the tank wall 2a of the bathtub 2 is provided, and the cylindrical valve box _A1 is formed into a connecting fitting, and a pivot shaft _A2 is installed inside the valve box _A1 . The pair of upper and lower valve bodies a ₃ and a ₄ can be swung open and closed toward one side of the opening of the valve box a ₁ , that is, the opposite side of the opening where the fitting collar 4 is provided. Equipped with shaft mounting.

The pivot a ₂ is formed of a synthetic resin material or the like, and is horizontally mounted so as to pass through the axis of the cylindrical valve box a ₁ at a substantially central portion in the cylindrical direction and at right angles to the axis.

The upper valve body _A3 functions to close the upper side area of the axis of the cylindrical valve box _A1 to prevent backflow of liquid, and is made of a material with a specific gravity smaller (lighter) than the specific gravity of the flowing liquid, for example. It is formed from polyethylene resin or the like into a substantially tongue-shaped planar shape that extends from the pivot a ₂ to the inner circumferential surface of the upper side area of the valve box a ₁ at a desired angle of inclination.

On the other hand, the lower valve body _A4 has the function of closing the lower side area of the axis of the cylindrical valve box _A1 to prevent backflow of liquid, and is made of a material with a specific gravity larger (heavier) than the specific gravity of the flowing liquid. For example, the upper valve body A ₃ is made of ABS resin etc.
It is formed into a substantially tongue-shaped planar shape having the same shape as .

Further, on the horizontal edges of the pair of upper and lower valve bodies a ₃ and a ₄ , shaft supports 5 and 6 are provided, respectively, which are alternately inserted and pivoted in the axial direction of the pivot a ₂ . i.e. upper valve body _a3 and lower valve body
Both a _{3 and} a ₄ are connected like a hinge to the axis a ₂ .
Pivot supports 5 and 6 are provided on the horizontal edge of the shaft, respectively. In addition, a resin foam is used as a material to change the specific gravity of the upper valve element A ₃ and the lower valve element A ₄ , and the density of the foam is changed so that the upper valve element A ₃ is made of a foam with a lower density. Each of the lower valve bodies _a4 may be formed of a foam with a high density.

Furthermore, the curved edges of the pair of upper and lower valve bodies _a3 and _a4 , that is, the curved edges that slope along the inner circumferential surface of the cylindrical valve box _a1 , are chamfered at a desired angle to bring them into surface contact with the inner circumferential surface. so that the valve is in the closed state.

In this embodiment, an upper valve body _{a 3} is attached to a pivot shaft a 2 that passes through the axial center of the cylindrical valve box a ₁ equipped with a fitting flange 4 and is suspended horizontally at right angles to the axial center. The shaft support 5 of the lower valve body A4 and the shaft support 6 of _the lower valve body A4 are alternately fitted and shaft-mounted, and both the valve bodies _A3 and _A4 are connected to the opening of the cylindrical valve box _A1 with the fitting flange 4. Both valve bodies a ₃ and a ₄ are equipped so as to be able to swing open and close, respectively, facing the opening on the opposite side, and the upper valve element a ₃ and the lower valve element a ₄ are pivoted according to the difference in specific gravity with the flowing liquid. The valve structure is such that the pipe is divided into upper and lower parts using ₂ as a fulcrum to close the pipe, and the pipe where the flow pressure is equal to the state where it is not hot, that is, the inside of the connecting pipe 7 that connects the outer pot 1 and the bathtub 2, is reliably closed. At the very least, it is designed to prevent backflow of bath water. In addition, if the bath water naturally flows through the connecting pipe 7 in a normal flow, the cylindrical valve box a ₁
The valves are opened by swinging the valves toward the axis of the valves (two-dot chain line in Figure 1).

In the above embodiment, the cylindrical valve box _a1 constituting the check valve main body A is connected to the tub wall 2a of the bathtub 2 by the connecting pipe 7.
As a connection fitting form for connecting, there is a temperature difference between the bath water temperature in the outer pot 1 and the bath water temperature in the bathtub 2, and the bath water is transferred from the outer pot 1 to the bathtub 2 due to the temperature difference. As shown in Fig. 6, the check valve main body A is used as a piping fitting for piping the pipes 8 and 8 together, with the check valve main body A installed in the middle of the pipe. The usage form is not limited and is arbitrary. In addition, numeral 9 in the figure is a rotation prevention convex portion of the pipe which is connected to the cylindrical valve box _a1 in a fitted manner.

<Effect of the invention> As mentioned above, the check valve of the present invention has a pivot passing through the axis of the cylindrical valve box and extending horizontally at right angles to the axis,
A pair of upper and lower valve bodies are mounted on the shaft so as to be able to swing open and close, respectively, facing one side of the opening of the cylindrical valve box, and the specific gravity of the upper valve body is smaller than the specific gravity of the flowing liquid, and The valve structure has a higher specific gravity than that of the flowing liquid, so it is possible to
Due to the difference in specific gravity with the flowing liquid, the upper valve element uses the pivot as a fulcrum to close the upper side area of the axial center of the cylindrical valve box, and the lower valve element uses the pivot as a fulcrum to close the axial center of the cylindrical valve box. This valve closes the lower side area of the shaft core.
Therefore, it is possible to securely close the valve in the pipe where the flow pressure is not too high and prevent the backflow of liquid. It can be used as a check valve to prevent bath water from flowing back into the bathtub from the outer pot due to a temperature difference with the inner bath water temperature.

Thus, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show an embodiment of the check valve of the present invention, in which Fig. 1 is a longitudinal sectional front view, Fig. 2 is a side view of the same, Fig. 3 is a perspective view with a part cut away, and Fig. 4 is a perspective view of the same. FIG. 5 is a longitudinal sectional front view showing an example of a usage state, and FIG. 6 is a longitudinal sectional front view showing another embodiment. In addition, in the figure, A: check valve body, _a1 : cylindrical valve box,
_A2 : Pivot, _A3 : Upper valve body, _A4 : Lower valve body.

Claims (1)

[Scope of utility model registration request] A pivot is horizontally suspended through the axial center of the cylindrical valve box and at right angles to the axial center, and a pair of upper and lower valve bodies can be swung open and closed on the pivot toward one side of the opening of the cylindrical valve box. What is claimed is: 1. A check valve characterized in that the check valve is equipped with a shaft, and has an upper valve element having a specific gravity smaller than that of a flowing liquid, and a lower valve element having a specific gravity greater than the specific gravity of a flowing liquid.