JPH10141526A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve which is simple in construction, high in sealing capability, and excellent in installation workability. SOLUTION: An annular body 2 is fitted closely to the inner wall of a tubular installation part 11, and of which form narrowed at a specified rate downwards is corrected in a position in parallel with the tubular installation part 11. Also a flexible valve body 3 is brought in a position where its free end is inclined to a valve seat 14 side. In addition, the check valve 11 is installed pressingly until the annular body 2 is brought in contact with the valve seat 14. In this case, the flexible valve body 3 is pressed against the valve seat 14 so as to close a valve hole 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve mounted on a fluid passage.

[0002]

2. Description of the Related Art In a conventional check valve a, as shown in FIG. 5, when a check valve a is screwed to a mounting portion d by inclining a valve seat surface b as shown in FIG. b so as to ensure the sealing performance when the fluid pressure acting in the reverse flow direction is low.

[0003]

However, it is difficult to manufacture an inclined valve seat surface, and it is necessary to match the direction of a check valve during mounting, so that mounting workability is not good. In addition, there is a problem that a fixing method using screws or the like is required. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a check valve with a simple structure, high sealing performance, and good mounting workability.

[0004]

In order to achieve the above object, a check valve according to the present invention comprises an annular body which is narrowed at a constant rate toward a charging side, and an inner periphery of the annular body. It is supported in a cantilever manner via a hinge portion provided at a lower portion, and is integrally formed with a flexible valve body that comes into contact with a valve seat,
The outer peripheral surface of the annular main body is brought into close contact with the inner peripheral wall of the mounting portion, and the shape in which the annular valve body is narrowed at a constant rate toward the insertion side is corrected. And the flexible valve body is pressed against the valve seat at a mounting position where the annular main body contacts the valve seat.

[0005]

According to the check valve of the above construction, the annular main body is elastically deformed when inserted into the mounting portion, and its outer peripheral surface comes into close contact with the inner peripheral wall of the mounting portion, and is directed toward the side to be inserted. Thus, the shape that contracts at a constant rate is corrected. As a result, the flexible valve body is tilted toward the valve seat, and the flexible valve body is pressed against the valve seat at the mounting position where the annular main body comes into contact with the valve seat, thereby ensuring the sealing performance. By forming an annular projection on the pressure contact surface between the valve body and the valve seat, the valve body comes into pressure contact with the valve body by linear contact, so the surface pressure on the contact surface is increased, and the sealing performance is further improved. Backflow can be prevented even with back pressure. In addition, since the check valve does not need to be aligned when it is inserted into the mounting portion, the mounting operation is quick and easy. Further, it is not necessary to tilt the valve seat, and it is not necessary to fix the check valve with screws or the like, so that it is easy to manufacture the valve seat, which can contribute to cost reduction.

[0006]

Embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of the check valve 1, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. The check valve 1 is an integrally molded product of synthetic rubber and includes an annular body 2 and a flexible valve body 3 supported in a cantilever manner at a lower inner peripheral portion of the annular body 2 via a hinge portion 4. . As shown in FIG. 2, the annular main body 2 is formed in a shape that is narrowed downward at a fixed rate in a free state. The flexible valve element 3 has a circular planar shape and an upper surface 3.
The shape of a is formed into a spherical shape. An annular projection 3c is formed on the lower surface 3b of the flexible valve body 3 so as to project therefrom.

[0007] The check valve 1 is mounted on a tubular mounting portion 11 which forms a part of a fluid flow path. A reduced diameter valve hole 12 is formed in the tubular mounting portion 11, and a valve seat 14 is formed in the reduced diameter step portion 13. The inner diameter Di of the tubular mounting portion 11 is formed substantially equal to the outer diameter Do of the lower end of the annular main body 2. As shown in FIG. 3A, the check valve 1 is inserted into the tubular mounting portion 11 from the lower end of the annular main body 2. The annular main body 2 is elastically deformed and closely adheres to the inner wall of the tubular mounting portion 11, and the shape of the annular main body 2 narrowing downward at a fixed rate is corrected to a posture parallel to the tubular mounting portion 11. At this time, the free end of the flexible valve body 3 is inclined toward the valve seat 14. Check valve 1 is shown in FIG.
As shown in (b), the annular body 2 is pushed in until it comes into contact with the valve seat 14 and mounted. In this state, the flexible valve 3
Presses against the valve seat 14. On the lower surface 3b of the flexible valve body 3,
An annular projection 3c is formed, and the flexible valve body 3 is pressed against the valve seat 14 in a line contact manner to close the valve hole 12.

The check valve 1 having the above-described structure is such that a pressure contact force can be obtained simply by mounting it on a mounting portion.
Is used in the ozone water producing apparatus 21 shown in FIG. The surplus ozone separating device 22 of the ozone water producing device 21 includes an ozone dissolved water tank 25 having a water supply port 23 on the upper side and a discharge port 24 on the lower side, and a float chamber 26 disposed on the upper surface thereof. Is done. The ozone-dissolved water tank 25 and the float chamber 26 communicate with each other through a communication hole 27. Float room 2
An opening / closing valve 29 which is closed by floating of a float 28 following the water level of the float chamber 26 and opened by descending is provided on an upper surface of the float chamber 26.
Are arranged. Float 26 via the on-off valve 29
The chamber and the ozonolysis device 30 are in communication. The ozonolysis device 30 reduces excess ozone separated by the excess ozone separation device 22 to oxygen and discharges it to the atmosphere.

In the water supply port 23 of the above-mentioned dissolved water tank 25,
An ozone dissolving device (ejector) 32 is connected.
An ozone generator 34 is connected to the ozone dissolution device 32 by an ozone supply pipe 33, and a water tap (not shown) is connected by a connection hose 35. Inside the connecting pipe 36 connecting the ozone supply pipe 33, a valve seat 36a is formed, and the check valve 1a is mounted. Then, ozone supplied from the ozone generator 34 via the check valve 1a is dissolved in tap water to produce ozone-dissolved water. Further, a vacuum breaker 37 is provided at the discharge port 24. Inside the communication pipe 38 that communicates with the atmosphere of the vacuum breaker 37,
A valve seat 38a is formed and the check valve 1b is mounted. The connection hose 39 connects the vacuum breaker 37 and the faucet 40 for discharging the ozone-dissolved water.

[0010] The ozone water producing apparatus 21 having the above-described structure discharges the ozone water obtained by dissolving and mixing the ozone from the ozone generator 34 into the tap water from the faucet 40. Surplus ozone separator 2
In the second ozone-dissolved water tank 25, surplus ozone that has not been completely dissolved in the tap water and flows into the float chamber 26 through the communication hole 27 and accumulates, and the buoyancy of the float 28 decreases. For this reason, the float 28 is lowered and the on-off valve 29 is automatically opened, and the excess ozone flows into the ozone decomposer 30 and is reduced to oxygen and released into the atmosphere. When the amount of ozone water supplied to the ozone-dissolved water tank 25 and the amount of ozone water flowing out of the faucet 40 are substantially balanced, the communication pipe 38 is closed by the check valve 1b.

When the ozone water producing apparatus 21 is installed at a high position and is used at a position where the faucet 40 is lower than the discharge port 24, the excess ozone separating apparatus 22 communicates with the atmosphere via the ozone decomposing apparatus 30. Discharge port 24
When the water head pressure from the pressure to the water surface in the ozone dissolved water tank 25 is applied, the amount of ozone water flowing out of the faucet 40 may be larger than the supply amount of tap water. In this case, the flow velocity of the ozone water flowing through the vacuum breaker 37 increases to a negative pressure, the check valve 1b opens, and the air flows in from the communication pipe 38.

For this reason, a fluid in which ozone water and air are mixed flows toward the faucet 40, and the ozone-dissolved water tank 25
The amount of effluent from is suppressed. Therefore, the ozone water is rapidly reduced from the ozone-dissolved water tank 25, and the water level is lowered.
4 will not be discharged. Therefore, even if the ozone water producing apparatus 21 is used at a high position, the problem that surplus ozone is discharged from the faucet 40 can be solved. When the faucet 40 is closed, the check valves 1a and 1b prevent the ozone-dissolved water from flowing back.

In the check valves 1a and 1b of the present invention, the flexible valve body 3 is pressed against the valve seat at the mounting position where the annular main body 2 comes into contact with the valve seat, so that the sealing property is ensured. By forming the annular projection 3c on the pressure contact surface of the valve body 3 with the valve seat, the flexible valve body 3 comes into pressure contact with the valve seat by line contact, so that the surface pressure on the contact surface increases and the sealing performance is improved. Further, even if the ozone-dissolved water side has a slight reverse pressure, the reverse flow can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a check valve 1. FIG.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an explanatory view showing a state in which a check valve 1 is mounted.

FIG. 4 is an ozone water producing apparatus 2 using check valves 1a and 1b.
FIG. 1 is a schematic configuration diagram in which a part of a part 1 is cut away.

FIG. 5 is a sectional view showing a conventional example.

[Explanation of symbols]

 1, 1a, 1b ... check valve 2 .... annular body 3 .... flexible valve body 3c ... annular protrusion 4 .... hinge part 11 ... tubular mounting part 14. valve seat

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[Procedure amendment]

[Submission date] November 14, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the check valve of the above construction, the annular main body is elastically deformed when inserted into the mounting portion, and its outer peripheral surface comes into close contact with the inner peripheral wall of the mounting portion, and is directed toward the side to be inserted. Thus, the shape that contracts at a constant rate is corrected. As a result, the flexible valve body is tilted toward the valve seat, and the flexible valve body is pressed against the valve seat at the mounting position where the annular main body comes into contact with the valve seat, thereby ensuring the sealing performance. By forming the annular projection on the contact face of the valve seat of the valve body, because the valve body is pressed against the valve seat with line contact, the surface pressure at the contact surface is the sealing property is further improved high, slight Backflow can be prevented even with back pressure. In addition, since the check valve does not need to be aligned when it is inserted into the mounting portion, the mounting operation is quick and easy. Further, it is not necessary to tilt the valve seat, and it is not necessary to fix the check valve with screws or the like, so that it is easy to manufacture the valve seat, which can contribute to cost reduction. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 21, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the check valve of the above construction, the annular main body is elastically deformed when inserted into the mounting portion, and its outer peripheral surface comes into close contact with the inner peripheral wall of the mounting portion, and is directed toward the side to be inserted. Thus, the shape that contracts at a constant rate is corrected. As a result, the flexible valve body is tilted toward the valve seat, and the flexible valve body is pressed against the valve seat at the mounting position where the annular main body comes into contact with the valve seat, thereby ensuring the sealing performance. By forming the annular projection on the contact face of the valve seat of the valve body, because the valve body is pressed against the valve seat with line contact, the surface pressure at the contact surface is the sealing property is further improved high, slight Backflow can be prevented even with back pressure. In addition, since the check valve does not need to be aligned when it is inserted into the mounting portion, the mounting operation is quick and easy. Further, it is not necessary to tilt the valve seat, and it is not necessary to fix the check valve with screws or the like, so that it is easy to manufacture the valve seat, which can contribute to cost reduction.

Claims (1)

[Claims] 1. A valve body which is supported in a cantilever manner via an annular main body having a shape narrowed at a fixed rate toward a side to be inserted, and a hinge portion provided at an inner peripheral lower portion of the annular main body. The annular valve body is integrally formed with a flexible valve body, and the outer peripheral surface of the annular main body is in close contact with the inner peripheral wall of the mounting portion, and the shape of the annular main body is narrowed at a constant rate toward the insertion side. By doing so, the flexible valve body is inclined to the valve seat side, and the flexible valve body is pressed against the valve seat at a mounting position where the annular main body comes into contact with the valve seat. And check valve.