JP2019002135A - Pressure relief device - Google Patents

Abstract

To increase an air capacity allowed to flow into the inside of a pressure relaxation device, and to miniaturize the device and to improve workability.SOLUTION: A pressure relaxation device 1 attached to drain piping comprises a bag-like part 11 expanded or shrunk according to pressure fluctuation, and reduced or increased in the capacity. The bag-like part 11 has an elastic material 12 comprising a metallic spring attached on a side face thereof along the longitudinal direction. In an ordinary time, the plate-shaped bag-like part 11 is spirally wound by the elasticity of the elastic material 12 from a tip side in order, to make facing faces of the bag-like part 11 abut on each other.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pressure relief device that is attached to a drainage pipe and relaxes pressure fluctuation in a drainage channel.

When drainage flows into the drainage pipe, pressure fluctuations may occur and the drainage flow path may become positive or negative pressure. In such a case, the positive pressure or the negative pressure is relieved by disposing a pressure relief device in the drain pipe.
Here, as a factor that causes a positive pressure in the piping, for example, in a housing complex, a large amount of drainage is generated in the vertical pipe from the upper floor, and the air that flows down along with the drainage flows into the horizontal pipe on the lower floor, The case where the inside of the drainage flow channel upstream from the horizontal pipe is positive is mentioned. When the positive pressure is generated, the sealing water of the drain trap is pushed out by the positive pressure, and the sealing water (drainage) flows backward into the room. On the other hand, the pressure relaxation device described in Patent Document 1 has a structure that relaxes pressure fluctuation by temporarily flowing air generated by positive pressure into the device.
In addition, the pressure relaxation apparatus which relieve | moderates a positive pressure is used also in order to accelerate | stimulate the starting at the time of starting of a siphon drainage system like patent document 2. FIG.

  On the other hand, as a factor causing the negative pressure in the pipe, for example, when the inside of the drainage channel is filled with drainage, the case where the inside of the drainage channel becomes a negative pressure due to the siphon phenomenon. When such negative pressure occurs, the drain trap water is drawn downstream and flows out due to the negative pressure, so that the drain trap's back flow prevention function is lost and odors and pests flow back into the room. Resulting in. As an apparatus for reducing such pressure fluctuation, an intake valve that sucks outside air when negative pressure is generated is known.

Japanese Patent Laid-Open No. 2006-102503 JP 2011-12536 A

  Due to the structure of the pressure relief device, it requires a capacity that allows air to flow into the interior of the drain pipe so as to eliminate the positive pressure in the drain pipe. Here, the volume of air that can flow into the pressure relief device is “the volume of the device−the amount of air that is already present in the device during normal times”. Refers to the normal state where there is no positive or negative pressure.) Therefore, in order to increase the capacity of the apparatus, it is necessary to increase the volume of the apparatus itself, or to reduce the amount of air already present in the apparatus during normal times, but if the volume of the apparatus is increased, the pressure The mitigation device becomes larger. Further, the place where the pressure relief device is arranged is a narrow space such as a wall in the building, under the floor, or in a cabinet, and it is difficult to increase the size of the device.

  The present invention has been invented in view of the above-described problems, and aims to increase the air volume that can flow into the pressure relaxation interior, and hence to downsize the apparatus and improve the workability.

The present invention according to claim 1 is a pressure relief device that is attached to a drain pipe and suppresses pressure fluctuations in the drain passage,
A bag-like portion that expands or contracts in response to pressure fluctuations inside the drainage pipe and the volume increases or decreases,
The bag-like portion is in a contracted state during normal times, and the opposing surfaces are close to each other, and expands when air flows into the inside, thereby buffering the positive pressure generated in the drainage flow path. It is the pressure relaxation apparatus characterized by doing.

The present invention described in claim 2 is characterized in that the bag-like portion includes an elastic material, and the bag-like portion forms a spiral shape by the elastic material during normal times and extends when air flows into the inside. The pressure relaxation device according to claim 1.

According to a third aspect of the present invention, in the pressure relaxation device according to the second aspect, the elastic material is a spiral spring.

The present invention described in claim 4 is the pressure relief device according to any one of claims 1 to 3, which is arranged in a substantially horizontal direction.

The present invention according to claim 5 is characterized in that the pressure relaxation device is
The pressure relief according to any one of claims 1 to 4, further comprising an intake valve that allows external air to flow into the drainage channel when the drainage channel has a negative pressure. Device.

In the present invention, since the opposing surfaces of the bag-like portion are close to each other during normal times, the air inside the bag-like portion (pressure relief device) can be almost discharged. Therefore, it is possible to ensure a large capacity for air to flow in when a positive pressure is generated in the drainage channel. Further, since the bag-like portion is wound up in a spiral shape by the elastic material, the air in the bag-like portion can be further discharged. That is, in the present invention, the volume of air that can flow into the bag-like portion is increased by reducing the air inside the bag-like portion as much as possible during normal times. Further, since the shrinkage of the bag-like portion is caused by the elastic material, the shrinkage state of the bag-like portion is not influenced by gravity, and the installation direction can be made free.
Further, since the pressure relaxation device includes the intake valve, it is possible to cope with the negative pressure in the drainage flow path.

It is a reference figure which shows the construction state of this invention. It is sectional drawing which shows the pressure relaxation apparatus in which a bag-shaped part is in a contracted state. It is sectional drawing which shows the pressure relaxation apparatus in which a bag-shaped part is in an inflated state. It is an exploded view of a pressure relaxation apparatus. It is a perspective view which shows a bag-shaped part. It is a front view which shows the bag-shaped part of the extending | stretched state. It is a reference figure which shows other embodiment. It is sectional drawing which shows the pressure relaxation apparatus arrange | positioned in the substantially horizontal direction. It is a reference view showing other embodiments.

  Below, the pressure relaxation apparatus of this invention is demonstrated, referring drawings. Note that the description given below facilitates understanding of the embodiment, and the present invention is not limited and understood by this. Moreover, in the following embodiment, up and down, right and left will be described based on the construction state shown in FIG. 1 unless otherwise specified.

  As shown in FIGS. 1 to 6, the pressure relief device according to the present embodiment is connected to a drainage pipe 100 continuous from equipment such as a kitchen and a wash bowl, and is branched at a downstream side of the drainage trap 200. It is arranged at the end.

  The pressure relief device 1 includes a casing 2, a backflow prevention valve 10, a bag-like portion 11, and an intake valve 13.

The casing 2 includes a casing lower part 3 and a casing upper part 5 made of a hard material.
The casing lower part 3 is substantially cylindrical and has an upper part connected to the casing upper part 5 and a lower end connected to the end of the branch pipe 300. The casing lower part 3 has a backflow prevention valve 10 and a connection part 7 disposed therein, and a holding part for holding the backflow prevention valve 10 from falling into the branch pipe 300 below the connection part 7. 4 projects from the inner surface toward the center.
The casing upper part 5 has a cylindrical shape extending upward, and a claw part that engages with the casing lower part 3 is formed at the lower end, and a hole part 6 is formed at the upper end. In addition, the space inside casing upper part 5 is larger than the bag-shaped part 11 of the extended state.
The connecting portion 7 is a cylindrical member disposed above the holding portion 4. A packing is fitted on the outer periphery of the connecting portion 7, and a tapered valve seat 9 with which the backflow prevention valve 10 comes into contact is formed at the upper end. Has been. The connecting portion 7 has a guide portion 8 protruding from the inner surface toward the center. The guide portion 8 extends in the axial direction, and is formed so that the width of the opposing guide portions 8 increases as it goes downward, so that the raised backflow prevention valve 10 contacts the valve seat 9. The operation of the check valve 10 is induced.
The backflow prevention valve 10 is a spherical float ball, and has a specific gravity lighter than water, but is formed with a weight that does not increase due to a positive pressure generated downstream. The backflow prevention valve 10 is placed on the holding portion 4 of the holding portion 4 during normal times, and floats by the drainage and contacts the valve seat 9 when it flows back into the drainage branch pipe 300.

As shown in FIG. 5 or 6, the bag-like portion 11 is a plastic film bag member, and its lower end is attached to the connection portion 7 in a watertight manner. In addition, about the said attachment method, various methods, such as adhesion | attachment and the fastening by a band member, may be employ | adopted. As shown in FIG. 5, the bag-like portion 11 has a cylindrical shape in the expanded state, but has a plate shape in which the opposing surfaces are close to each other in the contracted state. Further, the bag-like portion 11 is provided with an elastic material 12 made of a metal spring along the longitudinal direction on the side surface, and the plate-like bag-like portion 11 is caused by the elasticity of the elastic material 12 in normal times. The opposing inner surfaces of the bag-like portion 11 are in contact with each other by being wound in a spiral shape in order from the tip side. In FIG. 5, the inflated bag-like portion 11 is indicated by a one-dot chain line, and in FIG. 6, the elastic material 12 is indicated by a broken line.
The elastic member 12 is made of a metal spring, and in a normal time, has a spiral shape. However, when the bag-like portion 11 expands and the pressure accompanying the expansion overcomes the spring force, the elastic member 12 changes from a spiral shape to a linear shape. And stretched. In addition, when the pressure accompanying the said expansion | extension disappears, the elastic material 12 is comprised so that it may be folded in a spiral shape and contracted with a restoring force.

  As described above, the bag-like portion 11 is wound up in a spiral shape in order from the distal end side due to the elasticity of the elastic member 12 in a normal state, and the opposed surfaces are in contact with each other. Therefore, there is almost no air in the bag-like portion 11 that is wound up in a spiral shape. Further, even when waste water flows into the bag-like portion 11, the waste water can be discharged when it is wound up in a spiral shape.

  The intake valve 13 is attached below the casing lower part 3 and has a communication port 14 that opens downward and communicates with the outside, and a disc-shaped valve body 15 that closes the communication port 14. The valve body 15 rises when the inside of the drainage channel becomes negative pressure, and the negative pressure is eliminated by opening air to the drainage channel through the branch pipe 300 by opening the communication port 14. On the other hand, when the pressure in the drainage channel becomes positive, pressure is applied so as to be pressed against the communication port 14, thereby preventing the air in the drainage channel from flowing out to the outside.

  The pressure relief device 1 operates as follows.

First, as shown in FIG. 2, in a normal state where neither negative pressure nor positive pressure is generated in the drainage flow path, the bag-like portion 11 is wound up in a spiral shape by the elastic material 12. The air inside is almost exhausted and in a contracted state. In the contracted state at the normal time, the inner surfaces facing each other of the bag-like portion 11 are in contact with each other. Further, the backflow prevention valve 10 is placed on the holding portion 4, and the valve body 15 of the intake valve 13 is in a state of closing the communication port 14.
When a positive pressure is generated in the drainage channel from the normal state, air pushed up by the positive pressure flows into the bag-like portion 11 through the branch pipe 300. At this time, as shown in FIG. 3, the bag-like portion 11 is deformed linearly in order from the base side against the elastic force of the elastic material 12, and is expanded by air flowing into the inside, and deformed into a cylindrical shape. To do. Therefore, the air that has flowed back from the downstream side flows into the pressure relaxation device 1 and is stored, so that it is possible to prevent the sealed water of the drain trap 200 due to the positive pressure described above from flowing back indoors. In addition, since the hole 6 is opened in the casing upper part 5, the air existing between the inside of the casing upper part 5 and the outer periphery of the bag-like part 11 with the expansion of the bag-like part 11 is the hole 6. Discharged from.
And if the said positive pressure lose | disappears, the bag-shaped part 11 will shrink | contract, and it will be wound up spirally in order from the front end side by the restoring force of the elastic material 12, and all the inside air will be discharged | emitted.
Next, when a negative pressure is generated in the drainage flow path, air is drawn into the pipe by the negative pressure, whereby the valve body 15 in the intake valve 13 is raised and the communication port 14 is opened. At this time, outside air flows into the drainage channel from the communication port 14, and the negative pressure in the drainage channel is eliminated. When the negative pressure is eliminated, the valve body 15 that has risen closes the communication port 14 again, and the inflow of external air is stopped.

  When a backflow of drainage occurs in the drainage pipe 100, the drainage flows back through the branch pipe 300 and reaches the pressure relaxation device 1. At this time, the backflow prevention valve 10 is lifted by the backflowed drainage, and the flow path to the bag-shaped portion 11 is closed by contacting the valve seat 9, so that the drainage does not flow back to the bag-shaped portion 11. .

  In the pressure relief device 1 of the present invention, since the inner surfaces facing each other of the bag-like portion 11 are in contact with each other, the volume of air that can flow into the bag-like portion 11 is made substantially equal to the volume of the bag-like portion 11. It becomes possible. Further, since the bag-like portion 11 is spirally formed by the elastic material 12 during normal times, it becomes possible to efficiently discharge the internal air at the normal time or when the positive pressure is finished.

Although the first embodiment of the pressure relaxation device 1 is as described above, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist of the invention. For example, in the first embodiment, the pressure relaxation device 1 is connected to the end of the branch pipe 300 branched from the floor piping, but may be connected to the vertical pipe 400 of the apartment house as shown in FIG. Alternatively, it may be connected to the horizontal tube 500 under the floor. Here, as shown in FIG. 8, the pressure relief device 1 of the present invention is spirally formed by the elastic material 12 during normal times, so that the longitudinal direction of the pressure relief device 1 may be arranged in a substantially horizontal direction. Similarly to the case of arranging in the vertical direction, the bag-like portion 11 can form a spiral shape during normal times. Moreover, even if waste water flows into the bag-like portion 11 when arranged in a substantially horizontal direction, the waste water can be discharged by contracting in a spiral shape.
Moreover, since the outer side of the bag-shaped part 11 is covered with the hard casing 2, the bag-shaped part 11 at the time of expansion does not interfere with the horizontal tube 500 under the floor. As described above, since the guide portion 8 extends in the axial direction so that the width of the opposing guide portions 8 increases as it goes downward, the pressure relief device 1 is arranged in a substantially horizontal direction. In the meantime, the backflow prevention valve 10 at the normal time is located on the downstream side (right side in FIG. 8) and floats so as to come into contact with the valve seat 9 at the time of backflow of drainage.

  Moreover, the bag-shaped part 11 does not necessarily need to extend linearly at the time of expansion. That is, since the bag-like portion 11 has flexibility depending on its material, the bag-like portion 11 may be inflated with a part of the bent portion left in the casing 2 as in the embodiment shown in FIG. That is, in the pressure relaxation device 1 according to the present invention, air flows in in order from the base side when inflated. The bag-like portion 11 of the contact portion is still spiral. Therefore, starting from the upper end of the casing upper portion 5, the portion on the tip side from the middle of the bag-like portion 11 extends downward, and expands with a partially bent portion as shown in FIG. 9B. . In the embodiment, the height of the device can be suppressed.

  Moreover, the material of each member described in each said embodiment is an example to the last, and may change a material as needed. For example, in the first embodiment, the elastic member 12 is configured by a metal spring, but may be configured by elastic rubber or the like. Similarly, the bag-like portion 11 may use rubber or the like instead of the plastic film. Further, the elastic material 12 and the bag-like portion 11 do not necessarily have to be separate bodies, and the bag-like portion 11 is made of rubber and has a spiral shape during normal times, so that the elastic material 12 and the bag-like portion 11 are integrated. May be used.

DESCRIPTION OF SYMBOLS 1 Pressure relaxation apparatus 2 Casing 3 Casing lower part 4 Holding part 5 Casing upper part 6 Hole part 7 Connection part 8 Guide part 9 Valve seat 10 Backflow prevention valve 11 Bag-shaped part 12 Elastic material 13 Intake valve 14 Communication port 15 Valve body 100 Drainage pipe 200 Drain trap 300 Branch pipe 400 Vertical pipe 500 Horizontal pipe

Claims (5)

A pressure relief device that is attached to a drainage pipe and suppresses pressure fluctuations in the drainage channel,
A bag-like portion that expands or contracts in response to pressure fluctuations inside the drainage pipe and the volume increases or decreases,
The bag-like portion is in a contracted state during normal times, and the opposing surfaces are close to each other, and expands when air flows into the inside, thereby buffering the positive pressure generated in the drainage flow path. A pressure relief device. The pressure relief according to claim 1, wherein the bag-shaped portion includes an elastic material, and the bag-shaped portion is spiraled by the elastic material during a normal time and is stretched when air flows into the inside. apparatus. The pressure relaxation device according to claim 2, wherein the elastic material is a spiral spring. The pressure relaxation device according to any one of claims 1 to 3, wherein the pressure relaxation device is arranged in a substantially horizontal direction. The pressure relief device includes:
The pressure relief according to any one of claims 1 to 4, further comprising an intake valve that allows external air to flow into the drainage channel when the drainage channel has a negative pressure. apparatus.

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