JP2019196612A - Positive/negative pressure relaxation device - Google Patents

Abstract

To provide the positive/negative pressure relaxation device that can save space in installation and can be installed in a vertical direction or a horizontal direction.SOLUTION: The positive/negative pressure relaxation device that is attached to a drain pipe to relieve a positive/negative pressure of the drain pipe comprises: a rubber cylinder 11 that is a cylindrical member of a hollow elastic body long in an axial direction, and an outer cylinder 10 of a casing member covering the rubber cylinder 11, wherein the rubber cylinder 11 contracts in a lateral direction to relieve a positive pressure when a pressure inside the drain pipe is positive, and the rubber cylinder 11 widens in the lateral direction to relieve a negative pressure when the pressure in the drain pipe is negative.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a positive / negative pressure relaxation device that relieves pressure fluctuation in a drain pipe.

  In the drainage pipe, drainage and air exist, and pressure fluctuations occur in the pipe body depending on the amount of drainage and the amount of air.

  When the inside of the drainage pipe is in a positive pressure state, that is, when the atmospheric pressure is high, the air volume increases, and the air is trapped in the water, resulting in the air escaping from the trap. Sometimes. The cause of the positive pressure is that when a large amount of water is drained all at once, water and air often flow into the drainage pipe together. It is easy to become pressure, and an exhaust valve for venting is necessary. Except for the above-mentioned high-rise buildings, when draining, the inside of the drainage pipe is often in a negative pressure state, that is, the atmospheric pressure is often reduced. For this reason, sucking (withdrawing) of the sealed water is likely to occur, and an intake valve is required to prevent breakage.

  By the way, in recent years, concentrated torrential rains, which are also called guerrilla heavy rains, where local heavy rains occur in a short time frequently occur. In a combined sewer system that drains rainwater pipes that drain rainwater and sewage pipes that drain domestic wastewater, when draining rainwater in concentrated heavy rain, the combined pipes become full and the pressure inside the drainage pipes of the building Fluctuation will increase. If this happens, the inside of the pipe suddenly repeats positive and negative pressures, and the drain trap installed on the first floor of the building frequently blows off when it is positive and blows off when it is negative. is doing.

  In addition, even if it was not in extreme weather conditions such as torrential rain, the design of the drainage pipe was changed with the renovation and renovation of the building, and the drainage exceeded the allowable drainage at the time of the initial design. As a result, the pressure fluctuation in the pipe may become large.

  In order to cope with such a pressure fluctuation in the pipe, for example, in Patent Document 1, when the pipe internal pressure inside the drain pipe becomes a positive pressure when installed downstream of the drain trap, When the internal bag-shaped bellows part contracts to relieve the positive pressure in the pipe and the pressure in the pipe becomes negative, the intake valve of the negative pressure relief device is activated to suck in indoor air and Disclosed is a positive / negative pressure relief device for a drainage system that relaxes the negative pressure.

  Further, in Patent Document 2, a bag-like bellows portion is arranged downstream of the drain trap so as to hang vertically, and when the pressure inside the drain pipe becomes positive, the positive / negative pressure relaxation device When the bellows part inside the bag shrinks from the natural state, the positive pressure inside the pipe is reduced, and when the pressure inside the pipe becomes negative, the bag shape inside the positive / negative pressure relaxation device A positive / negative pressure relaxation device is disclosed in which the bellows portion of the tube extends from the natural state to relieve the negative pressure in the tube.

JP 2009-57780 A Japanese Patent Laid-Open No. 2006-102297

  However, in the positive / negative pressure relaxation device of the above-mentioned Patent Document 1, since the positive pressure relaxation device and the negative pressure relaxation device are configured separately, there is a problem that a large installation space must be taken. The positive / negative pressure relaxation device is installed in an outdoor space including an indoor space or a piping space, and particularly when installed in an indoor space, it is often arranged in a cabinet of a sink or a wash basin. In order to secure a large storage space in the cabinet, it is necessary to make the installation space of the apparatus as small as possible.

  Moreover, in the positive / negative pressure relaxation apparatus of the said patent document 2, it is comprised by the bellows shape, and is expanding and contracting the bellows to the up-down direction from the natural state. If it is installed horizontally (horizontal direction), the bellows hangs downward due to its own weight, so that it contacts the inside of the pipe and does not operate normally. Therefore, there is a problem that the installation direction is limited to the vertical installation and the vertical installation.

  Furthermore, a method of arranging an exhaust valve in the drain pipe downstream of the drain trap to release the pressure inside the pipe to the outside when the pressure inside the pipe is positive can be considered. When the exhaust is exhausted, odors and pests in the drainage pipe flow backward into the room, and therefore the arrangement of exhaust valves should be avoided as much as possible in the room including the piping space.

  Therefore, the present invention has been made in view of such circumstances and problems, and provides a positive / negative pressure relaxation device that can save space for installation and can be installed in a vertical direction or a horizontal direction. With the goal.

  In order to solve the above problems, a positive / negative pressure relaxation device according to the present invention is a positive / negative pressure relaxation device that is attached to a drain pipe and relaxes the positive and negative pressures of the drain pipe, and is a hollow that is long in the axial direction. An elastic cylindrical member is provided, and when the pressure inside the drain pipe is positive, the cylindrical member contracts in the lateral direction to relieve the positive pressure, and when the pressure inside the drain pipe is negative, the cylindrical member widens in the side direction. It is characterized by relieving negative pressure.

  According to this, since it becomes a simple configuration to relieve the positive and negative pressure in the pipe by the expansion and contraction of the cylindrical member of the elastic body, it is not necessary to secure a large space for installation of the apparatus, and space saving can be achieved. Thus, a positive / negative pressure relaxation device that can be installed in the vertical direction or the horizontal direction is realized.

  Here, the positive / negative pressure relaxation device preferably includes an intake valve at one end in the axial direction.

  According to this, when the inside of the pipe is positive pressure, the intake valve is closed and the exhaust to the outside is shut off, and when the inside of the pipe is negative pressure, it returns to the natural state by ventilation from the intake valve and intake from the sewage side. Can do.

  Furthermore, it is preferable that a concave portion or a convex portion is formed on the inner peripheral surface or the outer peripheral surface of the cylindrical member.

  According to this, by increasing the surface area of the cylindrical member, it is possible to reduce the pressure acting on the cylindrical member while reducing the atmospheric pressure in the pipe. The device can be realized.

  Moreover, even if it has the outer cylinder of the casing member which coat | covers the said cylindrical member, and changes the thickness and magnitude | size of the said outer cylinder and the said cylindrical member, and adjusts the shrinkage | contraction amount and the widening amount of the said cylindrical member Good.

  According to this, the positive / negative pressure relaxation amount suitable for the positive pressure relaxation amount and the negative pressure relaxation amount in the pipe can be obtained.

  As described above, according to the positive / negative pressure relaxation device according to the present invention, since the positive / negative pressure in the pipe is relaxed by expansion / contraction of the cylindrical member of the elastic body, space saving is achieved in the installation. It is possible to realize a positive / negative pressure relaxation device that can be installed in either the vertical direction or the horizontal direction.

It is a perspective view of the positive / negative pressure relaxation apparatus which concerns on embodiment of this invention. It is sectional drawing of a positive / negative pressure relaxation apparatus. It is a figure which shows operation | movement of a rubber cylinder and an intake valve. It is a figure which shows the attachment condition of a positive / negative pressure relaxation apparatus. It is a figure which shows the attachment condition of a positive / negative pressure relaxation apparatus. It is a figure which shows operation | movement of the rubber cylinder of the positive / negative pressure relaxation apparatus which concerns on a 1st modification. It is a front view of the positive / negative pressure relaxation apparatus which concerns on a 2nd modification. It is a perspective view of the positive / negative pressure relaxation apparatus which concerns on a 2nd modification. It is a perspective view of the positive / negative pressure relaxation apparatus which concerns on a 3rd modification. It is a perspective view of the positive / negative pressure relaxation apparatus which concerns on a 4th modification. It is a perspective view of the positive / negative pressure relaxation apparatus which concerns on a 5th modification.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a positive / negative pressure relaxation device according to the present invention will be described in detail based on embodiments.

  FIG. 1 is a perspective view of a positive / negative pressure relaxation device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view.

  The positive / negative pressure relaxation device 1 according to the present embodiment is a device that is installed in a drain pipe on the downstream side of a drain trap and relaxes the positive / negative pressure in the drain pipe by expansion and contraction of an elastic cylindrical member. The positive / negative pressure relaxation device 1 has a hollow cylindrical shape as a whole, and includes an outer cylinder 10 that is a casing member that covers the rubber cylinder 11, a rubber cylinder 11 for relaxing positive and negative pressure, and air in the apparatus. A vent pipe 12 serving as a passage is provided, and an intake valve 2 is provided at one end and a drain pipe connecting portion 3 connected to the drain pipe at the other end.

  The rubber cylinder 11 is formed of an elastic cylindrical member, and is a member that contracts and widens in the lateral direction to relieve positive and negative pressure in the pipe. The rubber cylinder 11 is long in the axial direction and is hollow so that the ventilation pipe 12 passes through the rubber cylinder 11. The elastic body constituting the rubber cylinder 11 is an elastic body made of a material having a high expansion / contraction rate, such as silicon rubber, ethylene / propylene / diene rubber (EPDM), thermoplastic elastomer (for example, styrene-butadiene-styrene triblock copolymer). Etc.) and natural rubber. The rubber cylinder 11 repeats contraction and widening in the lateral direction. Since the operating pressure increases as the film thickness of the rubber cylinder 11 increases, the rubber cylinder 11 is formed in a thin film of about 0.1 to 2.5 mm. preferable.

  FIG. 3 is a view showing the operation of the rubber cylinder 11 and the intake valve 2. In the positive / negative pressure relaxation device 1, a vent pipe 12 is disposed inside the rubber cylinder 11, and an intake valve 2 is disposed on the top of the vent pipe 12. In FIG. 3A, the positive / negative pressure relaxation device 1 is in a neutral natural state. When the inside of the pipe is in a positive pressure state, as shown in FIG. 3B, the rubber cylinder 11 contracts in the direction of the central axis, relieving the contracted positive pressure, and the intake valve 2 is closed to the outside. Exhaust to is blocked. When drainage is completed and ventilation is possible with the sewage side, it returns to the natural state by discharging the internal air to the sewage side. On the other hand, when the inside of the pipe is in a negative pressure state, as shown in FIG. 3C, the pipe is configured to return to a natural state by the ventilation from the intake valve 2 and the intake from the sewage side.

  The positive / negative pressure relaxation device 1 configured as described above can be disposed in the drainage pipe on the downstream side of the drainage trap, in an indoor living space, in an outdoor piping space such as under the floor, or outdoors. FIG. 4 and FIG. 5 are diagrams showing an attachment state of the positive / negative pressure relaxation device.

  FIG. 4 shows an example in which the positive / negative pressure relaxation device 1 is installed in the horizontal direction in the cabinet of the sink or the washstand in the indoor living space on the downstream side of the drain trap 8. FIG. 5 shows an example in which the positive / negative pressure relaxation device 1 is installed in a vertical direction in a piping space such as under the floor outside the living space 9.

  As described above, the positive / negative pressure relaxation device 1 relaxes the positive / negative pressure in the pipe by the expansion and contraction of the rubber cylinder 11. Since the positive / negative pressure relaxation device 1 has a simple configuration, it is not necessary to secure a large space for installation, space saving can be achieved, and it can be installed both vertically and horizontally. It has become. The amount of positive pressure relaxation and the amount of negative pressure relaxation in the drainage pipe depend on the amount of expansion / contraction (capacity) of the rubber cylinder 11, so that the thickness and size vary depending on the required amount of positive / negative pressure relaxation. The capacity may be adjusted by changing the thickness or size of the rubber cylinder 11 or the outer cylinder 10 by replacing the rubber cylinder 11 or the outer cylinder 10.

  Next, a modification of this embodiment will be described. In addition, the same code | symbol is attached | subjected to the structure same as embodiment, and description is abbreviate | omitted.

  FIG. 6 is a diagram illustrating the operation of the rubber cylinder of the positive / negative pressure relaxation device according to the first modification. The positive / negative pressure relaxation device according to the first modification is constituted by an outer cylinder 10 and a rubber cylinder 11.

  FIG. 6A shows a neutral natural state in which the positive / negative pressure relaxation device is not operating. From this state, when a large amount of drainage flows into the drain pipe and the inside of the pipe is in a positive pressure state, as shown in FIG. 6B, the rubber cylinder 11 contracts in the central axis direction and contracts. Relieve the minute positive pressure. On the other hand, when the inside of the pipe is in a negative pressure state, as shown in FIG. 6C, the rubber cylinder 11 widens from the central axis direction, and the negative pressure corresponding to the widened width is relaxed. When the positive and negative pressures in the pipe are alleviated and the fluctuation in atmospheric pressure is settled, the rubber cylinder 11a is restored to the original cylindrical shape, and the positive and negative pressure reducing apparatus returns to the neutral natural state shown in FIG. .

  Thus, the positive / negative pressure relaxation device may be simply configured by the outer cylinder 10 and the rubber cylinder 11.

  FIG. 7 is a front view of a positive / negative pressure relaxation device according to a second modification, and FIG. 8 is a perspective view.

  The positive / negative pressure relaxation device 4 according to the second modification includes an outer cylinder 20 and a rubber cylinder 21, and further, a rubber cylinder recess 22 formed by forming a concave portion which is a concave groove on the outer peripheral surface of the rubber cylinder 21. It has. Here, the outer cylinder 20 which is a casing member is omitted and illustrated.

  The larger the rubber cylinder 21 is, the more the rubber extends and the rubber tension increases. At the same time, the surface area of the rubber cylinder 21 increases. For example, as the size (radius or diameter) of the rubber cylinder 21 increases, the tension of the rubber similarly increases, while the surface area increases exponentially, so that the pressure applied to the rubber cylinder 21 can be suppressed. That is, by increasing the surface area of the rubber cylinder 21, the pressure inside the drainage pipe can be lowered.

  Here, the pressure inside the drain pipe is reduced while the pressure acting on the rubber cylinder 21 is reduced by forming an irregular shape on the inner or outer peripheral surface of the rubber cylinder 21 to increase the surface area of the rubber cylinder 21. It is possible to do. Thus, by increasing the surface area of the rubber cylinder 21 without increasing the size of the rubber cylinder 21, it is possible to realize the positive / negative pressure relaxation device 4 that contributes to space saving during installation.

  In the second modification example, the rubber cylinder concave portion 22 having a vertical concave groove shape and an upper and lower triangular shape is exemplified, but the groove shape may be an arc shape (R shape) or rubber. You may form the cylindrical recessed part 22 as a convex part which is a convex rib of the vertical direction. The following is another modification that increases the surface area of the rubber cylinder.

  FIG. 9 is a perspective view of a positive / negative pressure relaxing device according to a third modification.

  The positive / negative pressure relaxation device 5 according to the third modification shown in FIG. 9 twists the entire rubber cylinder 31 to form irregularities on the outer peripheral surface of the rubber cylinder 31 to form the rubber cylinder rib 32, and the surface area of the rubber cylinder 31. Is increased. Here also, the outer cylinder which is a casing member is omitted and illustrated.

  FIG. 10 is a perspective view of a positive / negative pressure relaxing device according to a fourth modification.

  The positive / negative pressure relaxation device 6 according to the fourth modification shown in FIG. 10 is such that a rubber cylinder rib 42 convex in the circumferential direction is formed on the outer peripheral surface of the rubber cylinder 41 to increase the surface area of the rubber cylinder 41. . Here also, the outer cylinder which is a casing member is omitted and illustrated.

  FIG. 11 is a perspective view of a positive / negative pressure relaxing device according to a fifth modification.

  In the positive / negative pressure relaxation device 7 according to the fifth modification shown in FIG. 11, the rubber cylinder rib 52 is provided on the outer peripheral surface of the rubber cylinder 51 so as to provide a spiral continuous convex portion, thereby increasing the surface area of the rubber cylinder 51. It has been made. Here also, the outer cylinder which is a casing member is omitted and illustrated.

  As described above, the positive / negative pressure relaxation device according to the present invention has been described based on the embodiment. However, the present invention is not limited to this, and the object of the present invention can be achieved and within the scope of the invention. Various design changes are possible and all are included within the scope of the present invention.

  For example, in the above embodiment, the rubber cylinder and the outer cylinder are shown in a cylindrical shape, but a square cylinder such as a quadrangle may be used, and one of the rubber cylinder and the outer cylinder is a cylinder and the other is a square cylinder. You may comprise by the combination of these.

  The positive / negative pressure relaxation device according to the present invention is suitable as a positive / negative pressure relaxation device for relaxing pressure fluctuation in the drain pipe.

1, 4, 5, 6, 7 Positive / negative pressure relaxation device 2 Intake valve 3 Drain pipe connecting part 8 Drain trap 9 Living space 10, 20 Outer cylinder 11, 21, 31, 41, 51 Rubber cylinder 12 Vent pipe 22 Rubber cylinder recess 32, 42, 52 Rubber cylinder rib

Claims (4)

A positive / negative pressure relaxation device that is attached to a drain pipe and relaxes the positive and negative pressure of the drain pipe,
A cylindrical member of a hollow elastic body that is long in the axial direction,
When the inside of the drainage pipe has a positive pressure, the tubular member contracts in the lateral direction to relieve the positive pressure,
When the pressure in the drain pipe is negative, the cylindrical member is widened in the lateral direction to relieve the negative pressure. The positive / negative pressure relaxation device is:
The positive / negative pressure relaxation device according to claim 1, further comprising an intake valve at one end in the axial direction. The positive / negative pressure relaxation device according to claim 1, wherein a concave portion or a convex portion is formed on an inner peripheral surface or an outer peripheral surface of the cylindrical member. An outer cylinder of a casing member covering the cylindrical member;
The positive / negative pressure according to any one of claims 1 to 3, wherein a thickness and a size of the outer cylinder and the cylindrical member are changed to adjust a contraction amount and a widening amount of the cylindrical member. Mitigation device.

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