JP2014015719A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve that has suitable drainage performance and besides, high durability against positive pressure from a downstream side, without increasing the overall height of a device.SOLUTION: A check valve 1 includes inclined planes 2 which gradually come close to each other downward from above and are provided on front and back surfaces of the check valve 1. The inclined planes 2 abut on each other to form an opening/closing part 3. In addition, the inclined planes 2 comprise first and second inclined planes 21 and 22 formed at different angles. When high positive pressure is generated from a downstream side, the second inclined planes 22 abut on each other and are brought into a closing state as a second opening/closing part to prevent backflow from the downstream side.

Description

  The present invention relates to a backflow prevention valve attached to a drain pipe or the like.

  Drainage piping for discharging the wastewater downstream is provided for equipment such as wash bowls, sinks, and bathtubs that produce wastewater when used.

  In the drainage pipe, if the equipment is connected to the downstream side, odors and pests from the sewage side pass through the drainage pipe and flow back indoors. Therefore, a drain trap or a backflow prevention valve having a mechanism for preventing the backflow of odors and pests from the sewage side is connected in the middle of the drainage pipe.

  The drainage trap has a structure in which drainage discharged from the equipment is stored inside, and a trap function that prevents backflow of the odor and pest is formed by filling a part of the drainage channel with the drainage. The stored wastewater is referred to as “sealed water”.

  However, when the drain trap is not used for a long time or when negative pressure is generated on the downstream side, the sealed water is reduced due to evaporation of the sealed water or negative pressure or positive pressure generated on the downstream side. A phenomenon called “breaking” occurs in which the trap function is lost.

On the other hand, the backflow prevention valve shown in FIG. 20 is made of an elastic material such as silicon and has a substantially cylindrical shape having a drainage channel inside, but has an inclined surface gradually approaching downward from the upper vicinity. The open / close portion is formed at the lower end by the abutting of the inclined surface against the opposing surface. That is, the opening / closing part has a shape in which one end of the cylinder is crushed and overlapped on the shaft, and has a substantially funnel shape in a side view. The opening / closing part is closed when there is no drainage.
When drainage flows from the upstream side (facility equipment side) of the backflow prevention valve toward the opening / closing part, the drainage is deformed by pushing the opening / closing part open, the closure of the opening / closing part is released, and the drainage flows downstream. Discharged. And when the inflow of the waste_water | drain from an upstream is complete | finished, an opening-and-closing part will again block | close with an own elastic force.
Therefore, the backflow prevention valve shown in FIG. 20 has a structure that prevents backflow of odors and pests from the sewage side by closing the opening / closing part (that is, used as a drain trap).

In the backflow prevention valve having the above-described structure, unlike the drain trap, it is not necessary to form a sealed water inside, so that a breakage phenomenon due to evaporation of the sealed water does not occur.
However, when equipment and a backflow prevention valve are installed near the vertical pipe, when a large amount of drainage occurs in the vertical pipe, a strong positive pressure is applied to the backflow prevention valve from the downstream side. There is. At this time, if the backflow prevention valve is a positive pressure up to a certain strength, it is structured not to be opened by the positive pressure, but if a positive pressure above a certain level is applied from the downstream side, it is made of an elastic material. May be deformed to an unexpected shape. And the valve part opened with the said deformation | transformation, and the odor, drainage, etc. from the downstream side itself flowed back indoors.

In order to counter such positive pressure from the downstream side, for example, it is conceivable to increase the hardness of the material of the backflow prevention valve, but if the hardness of the material is increased, the drainage performance when drainage occurs upstream will deteriorate. A problem arises.
In addition, it is conceivable to endure the positive pressure from the downstream side by making the opening / closing part (valve part) long, but even if the opening / closing part is long, drainage was generated upstream of the check valve. In this case, the drainage performance deteriorates, the apparatus itself becomes larger, the layout performance and the like are greatly reduced, and clogging of dust easily occurs.

JP 2011-89359 A

Then, this invention makes it a subject to provide the backflow prevention valve which has strong tolerance with respect to the positive pressure from a downstream, without enlarging the whole height of an apparatus, although providing suitable drainage performance.

The present invention according to claim 1 for solving the above problem is a backflow prevention valve made of a material having a substantially cylindrical shape and elasticity,
An inclined surface provided with an inclination so as to gradually approach the opposite surface as it proceeds downward,
An opening / closing part formed by contacting the inclined surface with the opposing surface,
The backflow prevention valve is characterized in that the inclined surface includes a first inclined surface and a second inclined surface which are inclined at different angles with respect to the axial direction.

The present invention according to claim 2 is a backflow prevention valve made of a substantially cylindrical material having elasticity,
An inclined surface provided with an inclination so as to gradually approach the opposite surface as it proceeds downward,
An opening / closing part formed by contacting the inclined surface with the opposing surface,
The opening / closing part is
A first opening / closing part that is in a closed state at normal time and is opened by a positive pressure from the upstream side;
The backflow prevention valve is characterized by comprising a second opening / closing portion that is open during normal times and is closed by a positive pressure from the downstream side and closed.

Invention of Claim 3 consists of the 1st inclined surface and 2nd inclined surface in which the said inclined surface inclines at a different angle with respect to an axial direction,
The backflow prevention valve according to claim 2, wherein the second inclined surface functions as a second opening / closing portion.

The present invention described in claim 4 is characterized in that the first inclined surface is more largely inclined with respect to the axial direction than the second inclined surface. It is a valve.

  The present invention according to claim 5 is the backflow prevention valve according to any one of claims 1, 3, or 4, wherein the inclined surface is a flat surface.

  The present invention described in claim 6 has a rigid portion on a cylindrical side surface adjacent to the inclined surface, and the check valve according to any one of claims 1 or 3 to 5. It is.

In the present invention according to any one of claims 1 to 3, the second opening / closing portion (second inclined surface) is closed when positive pressure is generated from the downstream side and the like, and the downstream area is reliably increased by increasing the closing area. Back flow from the side can be prevented.
In the present invention according to claim 4, since the first inclined surface is inclined more greatly with respect to the axial direction than the second inclined surface, the second inclined surface (second opening / closing portion) can be made easier and more reliable. It becomes possible to block.
In this invention of Claim 5, since the inclined surface is formed in the flat surface, it becomes possible to obstruct | occlude with a surface reliably at the time of obstruction | occlusion.
In the present invention described in claim 6, since the cylindrical side surface has the rigid portion, the backflow prevention valve is released from the unexpected deformation by the positive pressure from the downstream side, and the closing of the opening / closing portion due to the unexpected deformation is released. Will not be lost.

It is a perspective view which shows the backflow prevention valve of this invention. It is sectional drawing which shows the state in which the invention was attached to drainage piping. It is a side view which shows the backflow prevention valve of this invention. It is side surface sectional drawing which shows the backflow prevention valve of this invention. It is a front view which shows the backflow prevention valve of this invention. It is front sectional drawing which shows the backflow prevention valve of this invention. It is a bottom view which shows the valve closing state of the backflow prevention valve of this invention. It is a top view which shows the valve closing state of the backflow prevention valve of this invention. It is a perspective view which shows the valve closing state of the backflow prevention valve of this invention. It is a bottom view which shows the valve opening state of the backflow prevention valve of this invention. It is a top view which shows the valve opening state of the backflow prevention valve of this invention. It is a perspective view which shows the valve opening state of the backflow prevention valve of this invention. It is side surface sectional drawing which shows the valve closing state of the backflow prevention valve of this invention. It is side surface sectional drawing which shows 2nd embodiment of this invention. It is side surface sectional drawing which shows 3rd embodiment of this invention. (A) Side surface sectional view showing normal time of the fourth embodiment of the present invention, (b) Side surface sectional view showing a state in which positive pressure is generated from the downstream side. It is a side view which shows 5th embodiment of this invention. It is a perspective view which shows 5th embodiment of this invention. It is a bottom view showing a fifth embodiment of the present invention. This is a conventional check valve.

  Hereinafter, the backflow prevention valve 1 of this invention is demonstrated, referring drawings. The following description is for facilitating understanding of the embodiment, and the invention is not limited and understood by this. Further, unless otherwise specified, the upper, lower, left, and right sides will be described with reference to the front view shown in FIG.

  The backflow prevention valve 1 of the present invention shown in FIG. 1 is attached to a continuous drainage pipe from a facility device (not shown) that generates drainage by use, such as a wash bowl, a sink, a bathtub, etc., and has a substantially cylindrical shape inside. It has a drainage channel and is made of an elastic material such as silicon. Further, as shown in FIGS. 1 and 2, the mounting portion 13 provided on the upstream side has a substantially funnel shape in a side view, and is composed of an inclined surface 2, an opening / closing portion 3, a cylinder side surface 5 and the like. It consists of parts.

  The attachment portion 13 is provided on the upstream side of the inclined surface 2 (first inclined surface 21), and has a portion where the outer periphery and the inner periphery expand. As shown in FIG. 2, the backflow prevention valve 1 is fitted and attached to the flange portion of the drainage pipe by the enlarged diameter portion.

  In addition, the said attachment part 13 should just be a structure which can be attached to a drain piping watertight, and about a shape etc., it does not specifically limit.

  The backflow prevention valve 1 has inclined surfaces 2 that gradually approach from the vicinity near the upper side to the lower side on the front surface (FIG. 5) and the back surface (not shown because it is the same as FIG. 5). The opening / closing part 3 is formed by contact.

Here, the inclined surface 2 is formed of a first inclined surface 21 and a second inclined surface 22 which are flat surfaces having different inclination angles with respect to the axial direction, as shown in FIGS. When referring to the first inclined surface 21 and the second inclined surface 22 together, it is described as “inclined surface 2”). Further, a bent portion 8 is formed between the first inclined surface 21 and the second inclined surface 22.
The first inclined surface 21 is an inclined surface on the attachment portion 13 side (upstream side) and is inclined with respect to the axial direction of the backflow prevention valve 1. On the other hand, the second inclined surface 22 is an inclined surface on the opening / closing part 3 side (downstream side) provided continuously from the lower end of the first inclined surface 21, and will be described later from the lower end of the first inclined surface 21. A part extending to the opening / closing part 31 is formed and is inclined with respect to the axial direction of the check valve 1.
The first inclined surface 21 is inclined more than the second inclined surface 22 (with respect to the axial direction).
The bent portion 8 is a boundary between the first inclined surface 21 and the second inclined surface 22 and is close to the central axis direction by a positive pressure from the downstream side. Due to the proximity, the second inclined surfaces 22 come into contact with each other and function as a second opening / closing part 32 in the opening / closing part 3 described later. (In each figure, an auxiliary line indicating the position of the bent portion 8 is drawn to facilitate understanding of the bent portion 8.)

The opening / closing part 3 is formed by a first opening / closing part 31 and a second opening / closing part 32. (Hereafter, when referring to the first opening / closing part 31 and the second opening / closing part 32 together, it is described as "opening / closing part 3")
As shown in FIGS. 3 and 4, the first opening / closing part 31 is formed on the inclined surface 2 in a state where neither positive pressure nor negative pressure is applied from the upstream side and the downstream side of the backflow prevention valve 1 (hereinafter “normal time”). It extends vertically from the contact position (lower end of the second inclined surface 22) to the lower end of the backflow prevention valve 1. That is, the first opening / closing part 31 has a shape in which one end of the cylinder is crushed and overlapped on the shaft. Since the first opening / closing part 31 is kept closed as long as no pressure is applied from the inside (upstream side), it can prevent backflow of odors and pests from the downstream side (that is, used as a drain trap). . On the other hand, the second opening / closing part 32 is a portion provided continuously upward from the upper end of the first opening / closing part 31 and is opened during normal times, but is closed by a positive pressure from the downstream side. Then, the valve is closed. In the present embodiment, the second inclined surface 22 functions as the second opening / closing part 32.
In addition, the backflow prevention valve 1 is provided with a total of four ribs 6 which are rigid portions on a cylindrical side surface 5 which is a side surface adjacent to the inclined surface 2.

As shown in FIGS. 3 to 7, the rib 6 is a thick portion provided in parallel to the axial direction of the check valve 1 and has a higher rigidity than the other parts of the check valve 1, particularly the shaft. High rigidity with respect to the pressure in the direction (vertical direction).
The rib 6 extends from a height position of the upper end of the first inclined surface 21 to a position reaching the first inclined surface 21, and the rib 6 is provided only on the cylindrical side surface 5. The second inclined surface 22 is not reached.
That is, as shown in FIG. 5, the backflow prevention valve 1 has high rigidity in the axial direction in the area X where the rib 6 is provided, and prevents deformation due to positive pressure from the downstream side, while at the lower end of the rib 6. In the area Y up to the lower end of the opening / closing part 3, the rigidity (elasticity) is suppressed by not providing the rib 6 in order to perform suitable drainage. Since the rib 6 does not reach the second inclined surface 22 as described above, the second inclined surface 22 (second opening / closing portion 32) is disposed in the area Y. Therefore, when a positive pressure is generated on the downstream side, the rib 6 does not suppress the closing operation of the second inclined surface 22 (second opening / closing portion 32).
On the other hand, the rib 6 is provided above both ends of the first opening / closing part 31, but as shown in the front sectional view of FIG. 6, the rib 6 is flush with the contact surface 4 on which the inclined surfaces 2 contact each other. Is not provided. (FIG. 6 is a view in which the backflow prevention valve 1 is cut off at the contact surface 4) As shown in the side sectional view shown in FIG. 4 (and the bottom view shown in FIG. 7), the rib 6 is in contact. It is not arranged on the extension line of the surface 4 (first opening / closing part 31), but is arranged so as to sandwich the extension line. Accordingly, the ribs 6 are provided so as to sandwich the same plane (on the extension line) of the contact surface 4, and two ribs 6 are provided at both ends of the opening / closing part 3.

  As shown in FIGS. 7 to 9, the backflow prevention valve 1 having the above-described structure maintains the closed state of the opening / closing portion 3 in a state where drainage does not flow in from the upstream side and pressure is not applied (normal time). However, in other cases, it operates as follows.

When drainage occurs due to the use of equipment or the like, the drainage flows through the drainage pipe and flows into the backflow prevention valve 1. And the waste water which flowed into the backflow prevention valve 1 applies pressure (positive pressure) to the first opening / closing part 31 from the inside of the backflow prevention valve 1 by the water force or the weight of the drainage, and pushes the first opening / closing part 31 wide. . Then, when the first opening / closing part 31 is temporarily opened, the waste water flowing into the check valve 1 passes through the first opening / closing part 31 and is discharged downstream.

At this time, as shown in FIGS. 10 to 12, the backflow prevention valve 1 has a structure in which the first opening / closing part 31 is opened when the drainage flows in. Thus, since the rib 6 is provided only on the cylindrical side surface 5, the inclined surface 2 and the first opening / closing portion 31 that are largely deformed when the first opening / closing portion 31 is opened / closed are prevented from operating by the rib 6. There is no. When opening the valve, the cylindrical side surface 5 also needs to be deformed to some extent in the direction orthogonal to the axial direction. However, since the rib 6 is provided in parallel to the axial direction of the check valve 1, the axial direction It does not have high rigidity with respect to the orthogonal direction (compared to the axial direction) and does not hinder valve opening.
Further, when the backflow prevention valve 1 is opened, the opposed inclined surfaces 2 are deformed in a direction in which they are separated from each other, while the opposite ends at the lower ends of the opposed opening / closing portions 3 are deformed in a direction in which they are close to each other. Accordingly, as shown in FIGS. 10 and 11, the contact surface 4 of the cylindrical side surface 5 is directly above both ends of the lower end of the opening / closing portion 3 and is closed when the opening / closing portion 3 is closed in a bottom view (plan view). The portion that hits the extension line is most deformed. However, as described above, since the rib 6 is not provided at the location, elasticity is secured, and the opening and closing of the opening / closing portion 3 is not hindered.

  When the drainage from the equipment is completed, the opening / closing part 3 is again closed by its own elastic force. And the said obstruction | occlusion state prevents the backflow of the odor and pest from a downstream.

  On the other hand, when a positive pressure is generated from the downstream side of the check valve 1, the positive pressure does not work in the direction of expanding the opening / closing part 3, so that the opening / closing part 3 is kept closed.

Further, when a positive pressure that is so strong as to be deformed into an unexpected shape is generated from the downstream side in the case of the conventional check valve, the check valve 1 of the present invention has a bent portion 8 as shown in FIG. It approaches toward the central axis of the check valve 1. The second inclined surfaces 22 (second opening / closing portions 32) are in contact with each other, so that the closed area (contact surface 4) of the opening / closing portion 3 is increased, and even if the positive pressure is generated, the backflow is firmly prevented. Is possible.
At this time, as described above, since the rib 6 does not reach the second opening / closing portion 32 (second inclined surface 22), the closing operation of the second opening / closing portion 32 is not hindered by the rib 6.

  That is, in the backflow prevention valve 1 according to the present invention, when a strong positive pressure is generated from the downstream side, the backflow prevention function can be increased by closing the second opening / closing portion 32 provided in the area Y, and Since the area X is provided with a strong resistance to the direction (axial direction) in which positive pressure is generated from the downstream side by the rib 6 which is a rigid portion, deformation in an unexpected direction can be prevented.

  Therefore, in the present invention, by providing the second opening / closing part 32 that is in a valve open state during normal times and is closed when a positive pressure is generated on the downstream side, the drainage performance during normal times is high and the downstream side is It has a structure that can suitably prevent backflow when positive pressure occurs.

In the embodiment of the present invention described above, since both the first inclined surface 22 and the second inclined surface 23 are formed as flat surfaces, it is possible to reliably perform close contact at the time of closing. It is not limited to this. For example, as in the second embodiment of the present invention shown in FIG. 14, the inclined surface 2 may be arcuate.

  Further, as in the third embodiment of the present invention shown in FIG. 15, the inclined surface 2 may be composed of three surfaces, a first inclined surface 21, a second inclined surface 22, and a third inclined surface 23. In this case, the third inclined surface 23, which is the lowermost inclined surface 2 among the inclined surfaces 2, functions as the second opening / closing portion 32. Needless to say, the inclined surface 2 may be formed of more surfaces than in the third embodiment.

  Further, as in the fourth embodiment of the present invention shown in FIG. 16, the front and the back are asymmetric in side view (side sectional view), and the inclination angles of the inclined surfaces 2 provided on the front and back are different. May be.

  Further, in the above embodiment, the inclined surface 2 is provided on the front surface and the back surface of the check valve 1, but the inclined surface 2 is the front surface as in the fifth embodiment of the present invention shown in FIGS. (Or the back side) may be provided only.

  Moreover, in the said embodiment, although the rib 6 provided in the cylinder side surface 5 functioned as a rigid part, in this invention, what kind of arrangement | positioning of a rigid part, a shape, a structure, etc. may be sufficient.

  In addition, the backflow prevention valve 1 in this invention may be used as an intake valve attached to drainage piping etc.

  Further, the backflow prevention valve 1 in the present invention can be employed in a gas ventilation structure such as an air conditioner in addition to the drain pipe. In this case, it is conceivable that not only the downstream side of the backflow prevention valve 1 becomes positive pressure as in the above embodiment, but also the upstream side of the backflow prevention valve 1 becomes negative pressure, but the upstream side is negative pressure. Even in this case, since the rib 6 as the rigid portion is provided in parallel to the axial direction, the backflow prevention valve 1 does not deform unexpectedly, and the second opening / closing portion 32 The backflow can be prevented by blocking.

DESCRIPTION OF SYMBOLS 1 Backflow prevention valve 2 Inclined surface 21 First inclined surface 22 Second inclined surface 23 Third inclined surface 3 Opening and closing part 31 First opening and closing part 32 Second opening and closing part 4 Contact surface 5 Cylindrical side surface 6 Rib (rigid part)
8 Bending part 13 Mounting part

Claims (6)

A backflow prevention valve made of a material having a substantially cylindrical shape and elasticity,
An inclined surface provided with an inclination so as to gradually approach the opposite surface as it proceeds downward,
An opening / closing part formed by contacting the inclined surface with the opposing surface,
The backflow prevention valve characterized in that the inclined surface comprises a first inclined surface and a second inclined surface which are inclined at different angles with respect to the axial direction. A backflow prevention valve made of a material having a substantially cylindrical shape and elasticity,
An inclined surface provided with an inclination so as to gradually approach the opposite surface as it proceeds downward,
An opening / closing part formed by contacting the inclined surface with the opposing surface,
The opening / closing part is
A first opening / closing part that is in a closed state at normal time and is opened by a positive pressure from the upstream side;
A backflow prevention valve comprising a second opening / closing portion that is open during normal times and is closed by a positive pressure from the downstream side and closed. The inclined surface comprises a first inclined surface and a second inclined surface inclined at different angles with respect to the axial direction,
The backflow prevention valve according to claim 2, wherein the second inclined surface functions as a second opening / closing portion.   4. The backflow prevention valve according to claim 1, wherein the first inclined surface is greatly inclined with respect to the axial direction than the second inclined surface. 5.   The backflow prevention valve according to any one of claims 1 to 3, wherein the inclined surface is a flat surface. 6. The backflow prevention valve according to claim 1, further comprising a rigid portion on a side surface of the cylinder adjacent to the inclined surface. 7.

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