JP2020101203A - Suction/exhaust valve and drain pipe structure - Google Patents

Abstract

To provide a suction/exhaust valve which can alleviate an exhaust amount of air in a piping route.SOLUTION: A suction/exhaust valve 100 comprises: a connecting part 119; a valve main body 110 having an intake port 113 and an exhaust port 114; an intake valve body 120 for constantly closing the intake port 113, and operating so as to release the intake port 113 when a piping route is changed to negative pressure; an exhaust valve body 130 for constantly closing the exhaust port 114, and operating so as to release the exhaust port 114 when the piping route is changed to positive pressure; and a cover body 140 connected to the valve main body 110, covering the intake port 113 and the exhaust port 114 from the outside, and forming a release port 101 released to an atmosphere. An intake flow passage 102 extending from the release port 101 up to the intake port 113, and an exhaust flow passage 103 extending from the exhaust port 114 up to the release port 101 are formed in the cover body 140, and the intake flow passage 102 and the exhaust flow passage 103 are at least partially superimposed on each other.SELECTED DRAWING: Figure 3

Description

The present invention relates to an intake/exhaust valve that is installed in a piping path and eliminates positive pressure and negative pressure inside the piping path, and a drainage pipe structure.

Generally, a drainage pipe such as a sink, a bathtub, and a toilet of a kitchen installed in a building is provided with a drainage pipe for treating the drainage. Such a drainage piping structure includes a drain pipe having a trap portion curved in an S shape or a U shape, and is configured to store water in the trap portion. The sealing water stored in this trap block the inside of the drainage pipe to prevent odors drifting from the downstream of the drainage pipe from leaking into the room, and also to prevent the invasion of pests crawling up from the downstream side of the drainage pipe. .. However, if the atmospheric pressure in the drain pipe drops due to a large amount of water flowing through the drain pipe to a negative pressure, the sealing water in the trap portion may be sucked and flowed downstream. On the other hand, when a large amount of water is drained from the upper floors of condominiums and buildings, or when backwater flows from the sewage main due to guerrilla heavy rain, severe pressure fluctuations occur inside the drain, causing There is a possibility that the positive pressure will be temporarily increased and the sealing water in the trap section will be pushed out to the outside in the manner of an air gun, causing leakage of foul odors and water splashes. In order to prevent water leakage in such a trap portion, leakage of a foul odor, and splashing of water, an intake/exhaust valve is arranged downstream of the trap portion of the drain pipe. In other words, when the inside of the drain pipe becomes negative pressure, the outside air is sucked into the drain pipe through the intake/exhaust valve to eliminate the negative pressure state of the drain pipe, thereby preventing the sealing water from breaking in the trap portion, and When the inside of the pipe has a positive pressure, the air in the drainage pipe is discharged to the outside through the intake/exhaust valve to eliminate the positive pressure state of the drainage pipe, thereby preventing leakage of a bad odor and splashing of water.

For example, Patent Document 1 discloses an intake/exhaust valve that prevents the water trap of a drain trap from being broken and splashing of the water caused by a pressure rise and a pressure drop occurring in a drain pipe. Hereinafter, in this paragraph, the reference numerals of Patent Document 1 are shown in parentheses. The intake/exhaust valve of Patent Document 1 includes an intake/exhaust valve body (10), an intake valve body (32), and an exhaust valve body (50). In the intake/exhaust valve, an annular intake port (19) having an intake valve seat portion (13, 18) is provided on the outer peripheral side from the upper end of the pipe portion (14) of the intake/exhaust valve body (10). Further, an intake valve body (32) is provided which opens the intake port (19) away from the intake valve seat portion (13, 18) by the negative pressure of the drainage pipe. Further, an exhaust port (28) having an exhaust valve seat portion (29) formed in a peripheral edge is opened above the upper end of the pipe portion (14) of the intake/exhaust valve body (10). An exhaust valve body (50) is provided which opens the exhaust port (28) away from the exhaust valve seat (29) by pressurizing the drainage pipe. A cover (55) that covers the exhaust valve body (50) is fitted to the fitting edge (12a) on the upper portion of the exhaust valve body (50). An exhaust port (57) communicating with the outside air is opened in the cover (55).

Japanese Unexamined Patent Publication No. 10-89514

However, in the intake/exhaust valve of Patent Document 1, when the positive pressure in the drainage pipe is released, the exhaust valve body is opened, and the air in the drainage pipe is discharged through the exhaust port opened above the intake valve body. It is discharged into the inside of the cover. Then, all the air exhausted inside the cover portion is exhausted to the outside through the exhaust passage. The air exhausted to the outside is diffused into the atmosphere, and there is a problem that the odor is scattered to the space of the exhaust destination such as the room. On the other hand, in the intake/exhaust valve of FIG. 3 of Patent Document 1, an elbow pipe is connected to the exhaust passage of the cover to guide the odor to the outside, thereby coping with the problem of the odor. However, the coping means of Patent Document 1 requires an additional facility and the like and only guides the odor to another place, and thus is not a fundamental solution to the problem of the odor. Therefore, an object of the present invention is to provide an intake/exhaust valve that reduces the amount of discharged air itself when the positive pressure in the piping path is released.

The present invention has been made to solve the above problems, and an object thereof is to provide an intake/exhaust valve capable of reducing the exhaust amount of air inside a piping path, and a drain pipe structure using the intake/exhaust valve. To do.

The intake/exhaust valve according to claim 1, wherein the intake/exhaust valve has a connecting portion connected to a pipe path, an intake port for introducing outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path. Body,
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
An intake passage extending from the opening to the intake and an exhaust passage extending from the exhaust to the opening are formed inside the cover, and the intake passage and the exhaust passage are at least Characterized by partial overlap.

The valve according to claim 2, wherein the intake/exhaust valve has a connecting portion connected to a pipe path, an intake port for introducing outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path. Body,
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
The intake port and the exhaust port communicate with the outside air via a common opening.

The intake/exhaust valve according to claim 3, wherein the intake/exhaust valve has a connecting portion connected to a pipe path, an intake port for taking in outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path. Body,
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
An air pool space for temporarily retaining air from the internal space of the valve body is formed between the cover body and the valve body, and the intake port and the exhaust port are the internal space of the valve body. It is characterized in that it is arranged at a boundary between the air storage space and the air storage space.

The intake/exhaust valve according to claim 4 is the intake/exhaust valve according to any one of claims 1 to 3, wherein the intake port is arranged in the middle of an exhaust passage extending from the exhaust port to the open port. It is characterized by

The intake/exhaust valve according to claim 5 is the intake/exhaust valve according to any one of claims 1 to 3, wherein the exhaust port is arranged in the middle of an intake passage extending from the opening port to the intake port. It is characterized by

The intake/exhaust valve according to claim 6 is the intake/exhaust valve according to any one of claims 1 to 5, wherein the exhaust port is covered with the cover body so as not to be exposed to the outside. To do.

The intake/exhaust valve according to claim 7 is the intake/exhaust valve according to any one of claims 1 to 6, wherein the cover body temporarily holds air from the internal space of the valve body. A dome-shaped or roof-shaped cover portion so as to form the inside thereof, and the opening is formed in a gap between the valve body and the cover body.

The intake/exhaust valve according to claim 8 is the intake/exhaust valve according to claim 7, wherein the valve body is a cylindrical body extending in the axial direction, and the intake port and the exhaust port are axially upward. Open to
The cover portion extends from the top wall portion so as to cover the intake port and the exhaust port from above in the axial direction, and extends so as to surround the intake port and the exhaust port in a direction orthogonal to the axial direction. And a flange portion, and the opening is formed at the tip of the flange portion.

The intake/exhaust valve according to claim 9 is the intake/exhaust valve according to any one of claims 1 to 8, wherein the intake valve element is configured to operate with a pressure difference smaller than that of the exhaust valve element. It is characterized by being

The intake/exhaust valve according to claim 10 is the intake/exhaust valve according to any one of claims 1 to 9, further comprising a connecting mechanism for connecting the cover body to the valve body,
The connection mechanism is
A connecting piece having a shaft portion protruding from the cover body toward the valve body, and a claw portion protruding from the shaft portion and elastically displaceable;
An accommodating portion formed at a predetermined position around the valve body and forming a space for accommodating the claw portion in a locked state,
A space is provided continuously in the circumferential direction with respect to the accommodating portion, opened to the outside in the axial direction so as to allow axial movement of the claw portion, and has a space for introducing the claw portion from the circumferential direction into the accommodating portion. An introduction part to be formed,
When the pawl portion is formed in the valve body and restricts the movement of the pawl portion in the axial direction and the circumferential direction when the pawl portion is arranged in the housing portion, and when the pawl portion is arranged in the introducing portion, A restriction portion that allows movement of the claw portion from the introduction portion to the accommodation portion,
A plurality of rails extending along the circumferential direction from the peripheral wall of the valve body and spaced apart from each other so as to form a gap at the position of the accommodation portion and the introduction portion;
The position of the connecting piece and the position of the introduction portion are formed in the cover body so as to come into axial contact with the rail in a state of being displaced in the circumferential direction, and by sliding in the circumferential direction on the rail, A guide portion that guides the connecting piece to the introduction portion.

The intake/exhaust valve according to claim 11 is the intake/exhaust valve according to claim 10, wherein the restricting portion extends in a circumferential direction outside of the accommodating portion in the axial direction, and is arranged in the accommodating portion. A horizontal restricting wall that restricts the outward movement of the claw portion in the axial direction is provided, and the horizontal restricting wall is configured to allow the claw portion to move from the outer side to the inner side of the accommodating portion along the axial direction. It is characterized by being.

The drainage pipe structure according to claim 12,
A drainage pipe having a tubular portion formed at one end to form a piping path inside,
The intake/exhaust valve according to any one of claims 1 to 11, which is connected to the tubular portion,
When the pipe path continuously changes from a steady state to a positive pressure and a negative pressure, the exhaust valve body of the intake/exhaust valve opens the exhaust port and discharges air according to the change from the steady state to the positive pressure. The exhaust valve body closes the exhaust port and the intake valve body opens the intake port in accordance with the change from the pressure to the negative pressure, and at least a part of the air discharged from the exhaust port is introduced into the piping path. It is characterized by inhaling.

The intake/exhaust valve according to claim 1, wherein an intake passage extending from the opening to the intake formed in the cover body, and an exhaust passage extending from the exhaust to the opening at least partially overlap each other. It is characterized by being In particular, in the state where the positive pressure and the negative pressure are finely switched depending on the situation inside the piping path, the positive pressure and the negative pressure can be continuously eliminated by alternately operating the exhaust valve element and the intake valve element. Then, because the intake flow path and the exhaust flow path are polymerized, the internal air accompanied by the odor (in the piping path) discharged from the exhaust port at the time of positive pressure operates immediately after the positive pressure is released. Then, it is returned to the inside of the piping path from the opened intake port. That is, when the intake valve body of the present invention is operated to eliminate the negative pressure, the exhausted internal air remaining inside the cover body is introduced into the intake flow path together with the outside air flowing from the opening. By being sucked along the intake port, the exhaust amount of the internal air accompanied by the odor can be effectively reduced.

The intake/exhaust valve according to a second aspect is characterized in that the intake port and the exhaust port communicate with the outside air via a common opening port. In particular, in the state where the positive pressure and the negative pressure are finely switched depending on the situation inside the piping path, the positive pressure and the negative pressure can be continuously eliminated by alternately operating the exhaust valve element and the intake valve element. Since the intake port and the exhaust port communicate with the outside air via the common opening port, the internal air accompanied by the odor (in the piping path) discharged from the exhaust port at the time of positive pressure has eliminated the positive pressure. Immediately after that, the intake valve element is actuated and is returned to the inside of the pipe path from the opened intake port. That is, the intake/exhaust valve of the present invention, when the intake valve element is operated to eliminate the negative pressure, before the internal air is completely exhausted from the common opening, the intake valve and Since the exhausted internal air remaining inside the cover body is sucked in through the intake port, the exhaust amount of the internal air accompanied by odor can be effectively reduced.

The intake/exhaust valve according to a third aspect of the present invention is characterized in that the intake port and the exhaust port are arranged at a boundary between the internal space of the valve body and the air storage space inside the cover body. In particular, in the state where the positive pressure and the negative pressure are finely switched depending on the situation inside the piping path, the positive pressure and the negative pressure can be continuously eliminated by alternately operating the exhaust valve element and the intake valve element. Since both the intake port and the exhaust port are arranged at the boundary between the internal space of the valve body and the air accumulation space, the internal air (in the piping path) accompanied by the odor discharged from the exhaust port when the positive pressure is applied. Immediately after the positive pressure is released, the intake valve body is actuated and is returned to the inside of the piping path from the opened intake port. That is, in the intake/exhaust valve of the present invention, when the intake valve body is operated to eliminate the negative pressure, at least a part of the exhausted internal air remaining in the air reservoir space is discharged together with the external air flowing from the opening. By being sucked from the intake port, the exhaust amount of internal air accompanied by odor can be effectively reduced.

According to the intake/exhaust valve of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the intake port is arranged in the middle of the exhaust passage extending from the exhaust port to the open port. With this, it is possible to trap the internal air remaining in the middle of the exhaust flow path before reaching the open port and effectively inhale it into the inside of the piping path through the intake port.

According to the intake/exhaust valve of claim 5, in addition to the effect of the invention of any one of claims 1 to 3, the exhaust port is arranged in the middle of the intake passage extending from the opening port to the intake port. As a result, the internal air discharged from the exhaust port can be effectively sucked into the piping path along the intake flow path.

According to the intake/exhaust valve according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, the exhaust port is covered with the cover body so as not to be exposed to the outside. It is possible to retain the internal air discharged from the inside of the cover body for a long time without immediately releasing it to the outside.

According to the intake/exhaust valve according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 6, the cover body has a dome-shaped or roof-shaped cover portion, and thus the cover body is provided. An air collecting space can be effectively formed inside, and outside air can be effectively taken in through an opening formed in a gap between the cover body and the valve body.

According to the intake/exhaust valve of claim 8, in addition to the effect of the invention of claim 7, an air collecting space is formed between the top wall portion and the intake port and the exhaust port of the valve body, and the intake passage The discharged internal air is prevented from diverging upward in the axial direction. Further, since the flange portion surrounds the intake port and the exhaust port from the direction orthogonal to the axial direction, and the opening portion is formed at the tip end portion of the flange portion, the exhaust flow path of the internal air discharged from the piping path is formed. It is possible to bend and allow the internal air to stay for a longer time without immediately diverging to the outside.

According to the intake/exhaust valve of claim 9, in addition to the effect of the invention of any one of claims 1 to 8, the intake valve element operates with a pressure difference smaller than that of the exhaust valve element, so that the exhaust valve element It is possible to relatively increase the frequency of opening of the intake valve body after the opening of (1) to further increase the probability of sucking the internal air discharged from the exhaust port.

According to the intake/exhaust valve of the tenth aspect, in addition to the effect of the invention of any one of the first to ninth aspects, the coupling mechanism includes the guide means (the guide portion and the guide portion for guiding the coupling piece to the predetermined coupling position). Rail) guides the connecting piece to the introducing part, and moves the claw part of the connecting piece arranged in the introducing part in the accommodating part in the circumferential direction via the restricting part (allowing movement from the introducing part to the accommodating part). Then, the claw portion is arranged in the locked state in the accommodating portion by the regulation portion, and as a result, the cover body can be assembled to the valve body. That is, the connecting mechanism allows the worker to mount the cover body on the valve body only by rotating the cover body, and greatly improves the work efficiency in attaching and detaching the cover body.

According to the intake/exhaust valve of claim 11, in addition to the effect of the invention of claim 10, when the position of the claw portion of the cover body and the position of the horizontal regulation wall (accommodation portion) are aligned from the axial direction, The cover body can be assembled to the valve body by simply pressing the cover body axially downward toward the valve body. That is, the connecting mechanism of the present invention can also select the assembling method depending on the situation.

According to the drain pipe structure of the twelfth aspect, the effect of any one of the first to eleventh aspects of the invention can be exerted as the drain pipe structure. In particular, in the state where the positive pressure and the negative pressure are finely switched depending on the situation inside the piping path, the positive pressure and the negative pressure can be continuously eliminated by alternately operating the exhaust valve element and the intake valve element. Then, the internal air accompanied by the odor (in the piping path) discharged from the exhaust port at the time of positive pressure is re-introduced into the inside of the piping path from the intake port opened by the operation of the intake valve immediately after the positive pressure is released. Will be returned. That is, in the drainage pipe structure of the present invention, the intake valve body operates immediately after exhausting the internal air from the exhaust port to eliminate the negative pressure, and at least a part of the internal air exhausted from the exhaust port is opened. By being sucked into the inside of the pipe path from the intake port together with the outside air flowing from the inside, it is possible to effectively reduce the exhaust amount of the internal air accompanied by the odor.

The perspective view from the upper part of the intake-exhaust valve of one Embodiment which concerns on this invention, (b) The perspective view from the bottom. FIG. 2A is a plan view, FIG. 1B is a front view, FIG. 1C is a side view, and FIG. FIG. 3 is a sectional view taken along the line AA of the intake/exhaust valve of FIG. 2. FIG. 3 is a sectional view taken along line BB of the intake/exhaust valve of FIG. 2. CC sectional drawing of the intake/exhaust valve of FIG. The disassembled perspective view of the intake/exhaust valve of FIG. The perspective view of the cover body of the intake/exhaust valve of FIG. The (a) bottom view and the (b) DD sectional view of the cover body of FIG. The schematic diagram which looked at each stage (a)-(d) in the connecting operation of the connecting mechanism in the intake-exhaust valve of Drawing 1 from the bottom. The schematic diagram which shows each cross section (E1-E1 to E5-E5 cross section) form of Fig.9 (a)-(d). The schematic diagram which shows each step (a), (b) in a 2nd connection operation of the connection mechanism in the intake/exhaust valve of FIG. 1 by sectional view. The schematic disassembled perspective view of the drainage pipe structure of one embodiment concerning the present invention. In the drainage pipe structure of FIG. 12, a schematic cross-sectional view showing a state in which the exhaust valve element has been operated so as to eliminate the positive pressure inside the piping path. In the drainage pipe structure of FIG. 12, a schematic cross-sectional view showing a state in which the intake valve element has been operated so as to eliminate the negative pressure inside the piping path. (A) The perspective view from the upper part of the intake-exhaust valve of another embodiment (2nd Embodiment) which concerns on this invention, The perspective view from the lower part. FIG. 16A is a plan view, FIG. 15B is a front view, FIG. 15C is a side view, and FIG. 15D is a bottom view. FIG. 17 is a sectional view taken along line F-F of the intake/exhaust valve of FIG. 16. FIG. 16 is a schematic cross-sectional view showing a state in which the exhaust valve body operates so as to eliminate the positive pressure inside the piping path in the drainage pipe structure in which the intake/exhaust valve of FIG. 15 is installed. FIG. 16 is a schematic cross-sectional view showing a state in which the intake valve body operates so as to eliminate the negative pressure inside the piping path in the drainage pipe structure in which the intake and exhaust valves of FIG. 15 are installed. (A) The perspective view from the upper part of the intake-exhaust valve of another embodiment (3rd Embodiment) which concerns on this invention, The perspective view from the lower part. 20A is a plan view, FIG. 20B is a front view, FIG. 20C is a side view, and FIG. 20D is a bottom view. FIG. 22 is a sectional view taken along line GG of the intake/exhaust valve of FIG. 21. FIG. 21 is a schematic cross-sectional view showing a state in which the exhaust valve element operates so as to eliminate the positive pressure inside the piping path in the drain pipe structure in which the intake and exhaust valves of FIG. 20 are installed. FIG. 21 is a schematic cross-sectional view showing a state in which the intake valve body operates so as to eliminate the negative pressure inside the piping path in the drainage pipe structure having the intake and exhaust valves of FIG. 20. The schematic diagram which shows typically the drainage system in which the intake-exhaust valve of this invention can be installed. The graph which shows the time transition of the pressure in the piping path observed at the predetermined point of the drainage system of FIG.

An embodiment of the present invention will be described below with reference to the drawings. The shapes of the respective drawings referred to in the following description are conceptual diagrams or schematic views for explaining preferable shape dimensions, and the dimensional ratios and the like do not necessarily match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratios in the drawings. Further, it is needless to say that the up, down, left, and right directions in the present invention are merely concepts indicating relative positions, and these can be interchanged and applied.

The intake/exhaust valve 100 of one embodiment of the present embodiment is installed in a part of the piping path of the piping structure (in the present embodiment, the drainage pipe structure) so as to eliminate the positive pressure and the negative pressure in the piping path. Function. Hereinafter, the configuration of the intake/exhaust valve 100 of the present embodiment will be described with reference to the drawings.

1A and 1B are perspective views of an intake/exhaust valve 100 according to an embodiment of the present invention. 2A to 2C are a plan view, a front view, and a bottom view of the intake/exhaust valve 100. FIG. 3 is a vertical sectional view taken along the line AA of the intake/exhaust valve 100. 4 and 5 are a BB cross-sectional view and a CC cross-sectional view taken along the radial direction of the intake/exhaust valve 100. FIG. 6 is an exploded perspective view of the intake/exhaust valve 100.

The intake/exhaust valve 100 includes a valve main body 110 connected to a piping path, an intake valve body 120 that operates to eliminate a negative pressure of the internal pressure of the valve main body 110, and a positive internal pressure of the valve main body 110. An exhaust valve body 130 that operates to eliminate the above, and a cover body 140 attached to the valve body 110 so as to cover and protect the intake valve body 120 and the exhaust valve body 130.

The valve body 110 is open at both ends and has a hollow cylindrical shape extending along the axial direction. The valve main body 110 includes a peripheral wall 111 that surrounds the internal space from the circumference in the axial direction, and an upper wall 112 that extends radially inward from an upper end portion of the peripheral wall 111.

The upper portion of the peripheral wall 111 is formed with a relatively large diameter so as to surround the intake valve body 120 that is driven to the deep side in the axial direction in the internal space over the drive range. On the other hand, the lower portion of the peripheral wall 111 has a smaller diameter than the upper portion of the peripheral wall 111. A connection portion 119 for connecting to the tubular portion 13 (see FIG. 12) of the drainage pipe structure 10 is provided at a lower portion of the peripheral wall 111. The connecting portion 119 has a uniform cylindrical shape whose diameter is reduced in comparison with the upper portion of the peripheral wall 111 in accordance with the outer diameter of the tubular portion 13. The connection portion 119 has a connection port opened downward in the axial direction, and the internal space of the valve body 110 is connected to the piping path through the connection port.

The upper wall 112 extends so as to close the inner space from the upper side in the axial direction, and has an outer surface facing the outside air side and an inner surface facing the inner space. The inner surface and the outer surface of the upper wall 112 function as valve seats for receiving the intake valve body 120 and the exhaust valve body 130, respectively. The upper wall 112 is provided with an intake port 113 and an exhaust port 114 for communicating the inside and outside of the valve body 110. The intake port 113 is a circular opening formed in the radial center of the upper wall 112. The intake port 113 is opened axially upward. As shown in FIG. 3, a rubber annular packing 115 is arranged on the peripheral edge of the intake port 113 on the lower surface side of the upper wall 112. A valve seat surface for the intake valve body 120 is defined on the lower surface of the annular packing 115. The intake port 113 is constantly closed by the intake valve body 120. The intake port 113 is opened in accordance with the operation of the intake valve body 120, and air is taken into the internal space from the outside of the valve body 111 through the intake port 113. On the other hand, the exhaust port 114 is an annular opening formed outside the intake port 113 in the radial direction, as shown in FIG. The exhaust port 114 is opened axially upward. The exhaust port 114 is divided into a plurality of openings by a beam that extends radially in the radial direction. A valve seat surface for the exhaust valve body 130 is defined on the upper surface of the inner and outer peripheral edges of the exhaust port 114. The exhaust port 114 is constantly closed by the exhaust valve body 130. The exhaust port 114 is opened according to the operation of the exhaust valve body 130, and air is exhausted from the internal space of the valve body 111 to the outside through the exhaust port 114.

Further, a body-side magnet holding portion 116 for holding the body-side magnet M1 is provided substantially at the center of the upper wall 112 in the radial direction. The main body side magnet holding portion 116 holds the main body side magnet M1 by three beam-shaped portions extending from the inner peripheral surface surrounding the intake port 113 of the upper wall 112 toward the radial center. Further, a shaft holding portion is provided at the center of the main body side magnet holding portion 116 in the radial direction so as to vertically penetrate and slidably insert the valve shaft 122 of the intake valve body 120. In other words, the shaft holding portion has a shaft hole. Then, in the main body side magnet holding portion 116, an annular main body side magnet M1 is fitted and held in a groove around the shaft holding portion. The main body side magnet M1 is made of a permanent magnet such as a neodymium magnet, and functions so as to exert a repulsive force on a valve side magnet M2 and an intermediate magnet M3 which will be described later.

Further, an annular protrusion is formed near the outer peripheral edge of the upper wall 112. A main body side net sheet attaching portion 117 for attaching a tubular net sheet (not shown) is formed between the annular projection and the peripheral wall 111. The main body side net sheet attachment portion 117 has a circular or arcuate groove that opens upward in the axial direction. The main body side net sheet attaching portion 117 functions to cooperate with the cover body side net sheet attaching portion 145 of the cover body 140 to hold the net sheet, as described later. The mesh sheet prevents insects from entering the intake/exhaust valve 100 from the outside.

A connecting portion 118, which is a part of a connecting mechanism for connecting the cover body 140 to the valve body 110 in a lock manner, is provided on the outer periphery of the peripheral wall 111. The connecting portion 118 has a plurality of (three in the present embodiment) rails 118a that project piecewise from the outer peripheral surface of the upper portion of the peripheral wall 111. The number of rails 118a corresponds to the number of connecting pieces 142 of the cover body 140 described later. As shown in FIG. 4, the rails 118a are arc pieces extending in the circumferential direction with a predetermined length, and are arranged at predetermined intervals with a gap. The rail 118a extends in an arc shape at a position separated from the outer peripheral surface of the peripheral wall 111 by the beam body. As shown in FIGS. 1 and 5, a vertical regulating wall 118b extending vertically downward from the rail 118a in the axial direction is formed at one end in the circumferential direction of the rail 118a so as to face the adjacent gap. There is. Further, as shown in FIGS. 1 and 4, a horizontal restriction wall 111c that extends in a short length in the circumferential direction from the outer peripheral surface of the peripheral wall 111 is connected to the vertical restriction wall 118b. The upper surface of the horizontal regulation wall 111c is located at the same height as the upper surface of the rail 118a. Further, the outer edge of the upper surface of the horizontal regulation wall 111c is chamfered to form an inclined surface or an R surface. Further, a regulation claw 118d is formed at the tip of the horizontal regulation wall 111c (the end opposite to the vertical regulation wall 111b). The restricting claw 118d extends downward from the horizontal restricting wall 111c in the axial direction. The regulating claw 118d has an inclined surface on the tip side in the circumferential direction and a vertical surface on the opposite side. In the gap between the adjacent rails 118a, an introducing portion 118e for introducing a connecting piece 142 of the cover body 140, which will be described later, is formed on the tip side of the regulating claw 118d (the side spaced apart from the vertical regulating wall 118b in the circumferential direction) An accommodating portion 118f that accommodates the connecting piece 142 in a locked state is formed between the restriction claw 118 and the vertical restriction wall 111b (on the side that is circumferentially close to the vertical restriction wall 118b) (see FIG. 9 and the like). The connecting mechanism will be described later in detail together with the description of the cover body 140.

The intake valve body 120 is housed in an internal space surrounded by the peripheral wall 111, and is supported by the valve body 110 so as to move the intake port 113 along the axial direction so that the intake port 113 can be opened and closed. That is, the intake valve body 120 operates so as to steadily close the intake port 113 and open the intake port 113 when the internal space (piping path) of the valve body 110 changes to negative pressure.

More specifically, the intake valve body 120 is formed with a closing portion 121 formed in a cup shape having a circular shape in plan view, a valve shaft 122 extending upward from the center of the closing portion 121, and an upper end of the valve shaft 122. And a valve-side magnet holder 123. A valve-side contact surface is formed on the outer peripheral upper surface of the closing portion 121. As shown in FIG. 3, in the cross-sectional view cut along the radial direction, the valve-side abutment surface extends in a straight line with an inclination such that the outer peripheral side is lowered with respect to the axial direction, and extends obliquely upward (radial direction). Direction outward and axially upward). That is, the valve-side contact surface faces the valve seat surface (the lower surface of the annular packing 115) of the valve body 110.

As shown in FIG. 3, the valve shaft 122 is arranged on the central axis of the intake port 113 and penetrates the shaft hole of the shaft holding portion of the main body side magnet holding portion 116 of the valve main body 110. A valve-side magnet holding portion 123, which is located above the body-side magnet holding portion 116 and has a diameter larger than the hole diameter of the shaft-holding portion, is provided at the upper end of the valve shaft 122. The valve-side magnet holding portion 123 has a screw hole in the center, and is screwed to the upper end of the valve shaft 122 via the screw hole. In the valve side magnet holding portion 123, an annular valve side magnet M2 is fitted and held in an annular groove around the screw hole. That is, the valve-side magnet M2 is fixed to the tip of the valve shaft 122. The valve-side magnet M2 is a permanent magnet such as a neodymium magnet. Further, the intermediate magnet holder 124 is externally attached to the valve shaft 122. The intermediate magnet holder 124 has a shaft hole into which the valve shaft 122 is inserted, and is freely movable along the axial direction with respect to the valve shaft 122 via the shaft hole. In the intermediate magnet holder 124, an annular intermediate magnet M3 is fitted and retained in an annular groove around the shaft hole. The intermediate magnet M3 is a permanent magnet such as a neodymium magnet.

The intake valve body 120 of the present embodiment opens and closes the intake port 113 by the magnetic force of the magnets M1, M2, M3. Specifically, the main body side magnet M1 and the intermediate magnet M3 are arranged so that the same magnetic poles face each other so as to repel each other. Due to the repulsive force between the main body side magnet M1 and the intermediate magnet M3, the main body side magnet M1 urges the intermediate magnet M3 to float upward in the axial direction. Similarly, the intermediate magnet M3 and the valve-side magnet M2 are arranged such that magnetic poles of the same polarity face each other so as to repel each other. The repulsive force between the intermediate magnet M3 and the valve-side magnet M2 urges the intermediate magnet M3 to float the valve-side magnet M2 axially upward. The repulsive force between the magnets M1, M2, M3 cooperates to urge the intake valve body 120 to the closed position so that the valve-side contact surface of the closing portion 121 comes into pressure contact with the valve seat surface around the intake port 113. The intake valve body 120 constantly closes the intake port 113. On the other hand, when the internal space of the valve body 110 becomes negative pressure, if a downward force exceeding the magnetic force is applied to the intake valve body 120, the intake valve body 120 moves downward along the axial direction. The valve-side contact surface moves away from the valve seat surface, and the intake port 113 is opened (see FIG. 14). At this time, since the valve shaft 122 moves in the shaft hole of the shaft holding portion, the axial movement of the intake valve body 120 is stably guided by the main body side magnet holding portion 116. When outside air is taken into the internal space of the valve body 110 from the intake port 113 and the pressure in the internal space rises, the intake valve body 120 returns to the original closed position by the magnetic repulsive force between the magnets.

The exhaust valve body 130 is fixed to the upper wall 112 so as to cover the annular exhaust port 114 from above (outside the valve body 110). That is, the exhaust valve body 130 operates so as to steadily close the exhaust port 114 and open the exhaust port 114 when the internal space (piping path) of the valve body 110 changes to a positive pressure.

More specifically, the exhaust valve body 130 is formed of an elastically deformable annular elastic sheet. The exhaust valve body 130 includes a band-shaped closing portion 131 having a width that covers the annular exhaust port 114. A fixed end portion 132 that is embedded and fixed inside the upper wall 112 is formed on the inner peripheral edge of the band-shaped closing portion 131. That is, the exhaust valve body 130 is supported by the valve body 110 so as to have a free end on the outer peripheral edge side of the band-shaped closing portion 131. The exhaust valve body 130 has a valve side contact surface on the lower surface near the outer peripheral edge of the band-shaped closing portion 131. The valve-side contact surface of the band-shaped closing portion 131 contacts the valve seat surface on the upper surface of the outer peripheral edge of the exhaust port 114, so that the exhaust valve body 130 steadily closes the exhaust port 114. On the other hand, when the internal space of the valve body 110 becomes a positive pressure, an upward force (outward direction) acts on the strip-shaped closing portion 131 of the exhaust valve body 130. When this force exceeds the force for elastically maintaining the original shape, the exhaust valve body 130 is elastically deformed, the free end of the band-shaped closing portion 131 is flipped up, and the valve side contact surface is separated from the valve seat surface and exhausted. The mouth 114 is opened (see FIG. 13). When air is blown out from the exhaust port 114 and the pressure in the internal space of the valve body 110 is reduced, the exhaust valve body 120 elastically returns to the original closed position. In the present embodiment, the exhaust valve body 120 is configured to be less responsive to pressure fluctuation than the intake valve body 110 using magnetic force.

As shown in FIG. 6, the valve body 110 includes an upper divided body 110-1, an intermediate divided body 110-2, and a lower divided body 110-3 in the axial direction so as to support the intake valve body 120 and the exhaust valve body 130. It will be combined with. The upper divided body 110-1 is provided with a part of the upper wall 112, an upper portion of the intake port 113, and a main body side magnet holding portion 116. The intermediate divided body 110-2 is provided with a part of the upper wall 112, a lower portion of the intake port 113, and an exhaust port 114. A peripheral wall 111, a connecting portion 118, and a connecting portion 119 are provided on the lower divided body 110-3. The upper divided body 110-1 and the intermediate divided body 110-2 are integrally fixed so that the fixed end portion 132 of the outer peripheral edge of the exhaust valve body 130 is sandwiched between the members. With respect to the first assembly of the upper divided body 110-1 and the intermediate divided body 110-2, the valve shaft 122 of the intake valve body 120 is inserted into the shaft holding portion from the lower side in the axial direction, and the upper side in the axial direction of the shaft holding portion. The intermediate magnet holder 124 is externally fitted to the valve shaft 122, and the valve-side magnet holder 123 is screwed to the tip of the valve shaft 122, whereby the intake valve body 120 is supported by the first assembly. Then, the first assembly is coupled to the lower divided body 110-3, so that two types of valve bodies are provided as a second assembly of the upper divided body 110-1, the intermediate divided body 110-2, and the lower divided body 110-3. A valve body 110 that operably supports 120 and 130 is configured. The intake/exhaust valve 100 is constructed by detachably attaching the cover body 140 to the valve body 110.

As shown in FIG. 3, the cover body 140 covers the valve body 110 from above in order to protect or protect the inside of the valve body 110, the intake valve body 120, and the exhaust valve body 130 from dust. That is, the cover body 140 is configured to be connected to the valve body 110, cover the intake port 113 and the exhaust port 114 from the outside, and form the opening 101 that is open to the outside air.

FIG. 7 is a perspective view of the cover body 140. FIG. 8 is a bottom view of the cover body 140 and a vertical sectional view thereof. As shown in FIGS. 7 and 8, the cover body 140 has a dome-shaped or roof-shaped cover portion 141. The cover part 141 extends so as to cover the intake port 113 and the exhaust port 114 from above in the axial direction, and extends so as to surround the intake port 113 and the exhaust port 114 in a direction orthogonal to the axial direction. The existing flange portion 141b. When the cover body 140 is attached to the valve body 110, the opening 101 is formed at the tip of the flange portion 141b.

In addition, a cover body side net sheet attachment portion 145 extending in an arc shape is provided on the inner surface of the cover portion 141. The cover body side net sheet attaching portion 145 corresponds to the main body side net sheet attaching portion 117, and has a groove that opens downward in the axial direction. The grooves of the cover body side net sheet attachment portion 145 and the main body side net sheet attachment portion 117 face each other, and when the cover body 140 is mounted on the valve body 110, hold the net sheet in a tubular shape therebetween. Is possible.

Further, a connection piece 142 for detachably connecting to the valve body 110 is provided on the inner surface of the cover body 140. In this embodiment, three connecting pieces 142 are formed. As shown in FIG. 8B, the connecting piece 142 includes a shaft portion 142a extending in a flat plate shape from the inner surface of the top wall portion 141a along the inner wall of the flange portion 141b, and an elastic member protruding radially inward at its tip. It has a displaceable claw portion 142b. The claw portion 142b of the connecting piece 142 extends in the circumferential direction, has an inclined surface on the lower surface, and has an engagement surface on the upper surface that is perpendicular to the shaft portion 142a (extends in the horizontal direction). Further, a guide step portion (guide portion) 143 is formed on the radially outer side of each connecting piece 142. The guide step 143 is formed on the lower surface of a rectangular ridge that rises from the inner peripheral surface of the flange 141b. The guide step portion 143 forms a guide surface that faces downward in the axial direction. Furthermore, on the inner peripheral surface of the flange portion 141b, an engagement step portion 144 is provided at a position that is circumferentially adjacent to the guide step portion 143 and that is retracted axially upward from the guide surface of the guide step portion 143. The engagement step portion 144 extends horizontally along the circumferential direction on the inner peripheral surface of the flange portion 141b, and forms an engagement surface facing downward in the axial direction. The guide step portion 143 and the engagement step portion 144 are configured to engage with the rail 118a of the valve body 110 from above in the axial direction and be slidable in the circumferential direction with respect to the upper surface of the rail 118a. Each element described here forms a part of the connecting mechanism.

Next, a connecting mechanism for connecting the valve body 110 and the cover body 140 will be described. When the cover body 140 is attached to the valve body 110, the connecting mechanism of the present embodiment places the cover body 140 on the upper surface of the valve body 110 and rotates the cover body 140 in one direction to move the cover body 140 to the valve body 110. Lockable. 9 and 10 show the form of the connecting mechanism in each step when the valve body 110 and the cover body 140 are mounted.

Specifically, a guide surface on which the guide step 143 of the cover body 140 can be placed is formed on the upper surface of the rail 118a of the valve body 110. As shown in FIGS. 9A and 10A, when the cover body 140 is placed on the valve body 110 and the connecting piece 142 of the cover body 140 is at a position displaced from the introduction portion 118e. The guide step 143 is placed on the rail 118a. Here, a vent hole communicating with the opening 101 is formed between the rail 118 a and the outer surface of the peripheral wall 111 of the valve body 110. Then, when the cover body 140 is rotated in one direction (counterclockwise in FIG. 9) with respect to the valve body 110, the lower surface of the guide step portion 143 slides on the upper surface of the rail 118a, and the connection provided in the guide step portion 143 is provided. The piece 142 is guided to the introduction portion 118e located in the gap between the rails 118a. That is, the introduction part 118e is opened axially upward (outer side) so as to allow the claw part 142b to move in the axial direction, and forms a space for introducing the claw part 142b in the accommodation part 118f from the circumferential direction. Needless to say, the connecting piece 142 may be directly arranged on the introducing portion 118e without mounting the guide step portion 143 on the rail 118a.

As shown in FIG. 9B, when the connecting piece 142 moves to the introducing portion 118e, the guide step portion 143 drops from the rail 118a, and the cover body 140 gradually descends axially downward. Then, as shown in FIG. 10B, the engagement step portion 144 located axially above the guide step portion 143 engages with the rail 118a, and the cover body 140 is placed on the valve body 110 at a predetermined height. Supported or placed. As shown in FIG. 10( c ), in the introduction portion 118 e, the upper part of the connecting piece 142 in the axial direction is opened, so that the cover body 140 can be separated from the valve body 110 in the upper axial direction. In addition, in the introduction portion 118e, the position of the claw portion 142b of the connecting piece 142 is axially lower than the horizontal regulation wall 118c, and is a position at which the vertical regulation wall 118b and the regulation claw 118d can be engaged in the circumferential direction. It is located in.

When the cover body 140 is further rotated in one direction (counterclockwise in FIG. 9) with respect to the valve body 110 from the state of FIG. 9B, as shown in FIG. 9C and FIG. The shaft portion 142a of the connecting piece 142 elastically deforms outward in the radial direction, and the pawl portion 142b rides on the inclined surface of the regulating pawl 118d. When the pawl portion 142b moves over the regulating pawl 118d in the circumferential direction, the connecting piece 142 is housed from the introducing portion 118e to the housing portion 118f. The restricting claw 118d allows movement of the claw portion 142b in one direction (movement from the introducing portion 118e to the receiving portion 118f), but restricts movement in the other direction (moving from the receiving portion 118f to the introducing portion 118e). To function.

Alternatively, the claw portion 142b of the connecting piece 142 may move axially from the outside to the inside of the accommodation portion 118f and enter the accommodation portion 118f without the introduction portion 118e. As shown in FIG. 11A, the connecting piece 142 is arranged above the housing portion 118f, and the cover body 140 is pushed downward (inward) in the axial direction with respect to the valve body 110. As shown in FIG. 11B, while the inclined surface of the claw portion 142b facing inward in the radial direction and downward in the axial direction is in contact with the inclined surface or the R surface of the horizontal restriction wall 118c, the horizontal restriction wall 118c is radially outside. The connecting piece 142 is elastically deformable so as to get over the vehicle. That is, the horizontal regulation wall 118c guides the elastic displacement of the claw portion 142b outward in the radial direction by its inclined surface or R surface, and the claw portion 142b moves axially inward from the outside of the accommodation portion 118f. Tolerate.

As shown in FIG. 9D and FIG. 10E, the shaft portion 142a of the connecting piece 142 elastically returns to the original shape, and the claw portion 142b is more radial than the outer surface (outermost protruding surface) of the regulating claw 118d. It is located inside. Further, in the housing portion 118f, the claw portion 142b is arranged axially below the horizontal regulation wall 118c, and the engagement surface of the claw portion 142b can engage with the lower surface of the vertical regulation wall 118b. That is, the claw portion 142b is locked to the vertical restriction wall 118b in the axial direction, so that the axial separation of the cover body 140 from the valve body 110 is restricted. On the other hand, the engagement between the lower surface of the engagement step portion 142 of the cover body 140 and the upper surface of the rail 118a of the valve body 110 allows the cover body 140 to be supported at a predetermined mounting height, so that the cover body 140 is axially lower than the valve body 110. Movement to is also regulated.

In addition, in the accommodation portion 118f, the claw portion 142b is arranged between the vertical regulation wall 118b and the regulation claw 118d in the circumferential direction. The vertical regulation wall 118b extends in the axial direction on the inner side of the housing portion 118f and is engageable with the side end surface of the claw portion 142b in the circumferential direction. That is, the vertical regulation wall 118b can lock the claw portion 142b that moves in one direction (counterclockwise in FIG. 9). On the other hand, the restricting claw 118d extends in the axial direction at the boundary between the introducing portion 118e and the housing portion 118f, and is engageable with the side end surface of the claw portion 142b from the circumferential introducing portion 118e side. That is, the vertical surface of the regulating claw 118d locks the claw portion 142b that moves in the other direction (clockwise in FIG. 9). That is, the movement of the connecting piece 142 in both the circumferential direction is restricted in the housing portion 118f.

That is, the housing portion 118f is formed at a predetermined coupling (locking) position around the valve body 110, and forms a space for housing the claw portion 142b in a locked state. Further, the vertical restriction wall 118b, the horizontal restriction wall 118c, and the restriction claw 118d cooperatively function as a restriction part that restricts the axial and circumferential movements of the claw 142b arranged in the housing 118f. Then, the cover piece 140 is connected to the valve body 110 in a lock manner by housing the connecting piece 142 in the housing portion 118f.

On the other hand, in order to remove the cover body 140 from the valve body 110, the connecting piece 142 is elastically deformed radially outward with a tool or the like, and the cover body 140 is rotated in the other direction (clockwise in FIG. 9). The lock can be released by moving the connecting piece 142 from the housing portion 118f to the introducing portion 118e. Alternatively, the lock can also be released by elastically deforming the connecting piece 142 outward in the radial direction with a tool or the like and pulling the cover body 140 axially upward so that the claw portion 142b can pass over the horizontal regulation wall 118c. You can

Therefore, in the coupling mechanism, the guide means (the guide step 143 and the rail 118a) for guiding the coupling piece 142 to the predetermined coupling position allows the operator to rotate the cover body 140 in one direction so that the valve body 110 can be moved. It is possible to attach the cover body 140, and to greatly improve the work efficiency in attaching and detaching the cover body 140. In particular, according to the coupling mechanism of the present embodiment, when the cover body 140 is held by hand and assembled to the valve body 110, the hand and the cover body 140 themselves become an obstacle, or due to factors such as the work posture and the surrounding environment, Even if the positional relationship between the claw portion 142b and the housing portion 118f cannot be visually confirmed, the cover body 140 can be assembled to the valve body 110 only by the feel of the hand by the operation of placing and rotating the cover body 140. .. Alternatively, the position of the claw portion 142b and the position of the housing portion 118f of the cover body 140 can be visually recognized from below the cover body 140, or the cover body 140 is transparent so that the claw portion 142b and the housing portion 118f can be respectively viewed. In such a case, the cover body 140 is simply pushed downward in the axial direction toward the valve body 110 by matching (facing) the positions of the horizontal regulating wall 118c and the claw portion 142b, and the cover body 140 is simply pushed. Can be mounted on. That is, the connecting mechanism of the present embodiment can also select the assembling method depending on the situation.

Based on the above description of each component, the intake/exhaust valve 100 will be described in more detail with reference to FIG. 3 again.

As shown in FIG. 3, in a steady state (a normal pressure state in which the valve element operates and which is lower than a predetermined positive pressure and higher than a negative pressure), the intake port 113 opened at the center in the radial direction is moved by the intake valve body 120. The exhaust valve 114, which is closed and has an annular opening outside, is closed by an exhaust valve body 130. When the internal space of the valve body 110 (the space on the piping path side of the intake port 113 and the exhaust port 114) becomes negative pressure, the intake valve body 120 is pushed down to suck the outside air from the intake port 113 to eliminate the negative pressure. It At this time, the exhaust valve body 130 keeps the exhaust port 114 closed. On the other hand, when the internal space of the valve body 110 has a positive pressure, the exhaust valve body 130 is bent and deformed to discharge the air in the internal space from the exhaust port 114, and the positive pressure is released. At this time, the intake valve body 120 keeps closing the intake port 113. In the present embodiment, since the intake valve body 120 is configured to operate with a pressure difference smaller than that of the exhaust valve body 130 in order to reduce the frequency of exhaust with respect to intake air, the initial movement is faster than that of the exhaust valve body 130.

Further, the cover portion 141 of the cover body 140 covers the upper surface of the valve body 110 in a dome shape or a roof shape so that the intake port 113 and the exhaust port 114 are not exposed to the outside. In particular, the top wall part 141a covers the intake port 113 and the exhaust port 114 from above in the axial direction, and the flange part 141b covers the intake port 113 and the exhaust port 114 from a direction orthogonal to the axial direction. That is, the cover part 141 forms a covering space that closes the upper surface of the valve body 110 from above in the axial direction. The opening 101 is formed at the lower end of the flange portion 141b. As a result, as shown in FIG. 3, only the peripheral wall 111 of the valve body 110 and the inner surface of the cover portion 141 of the cover body 140 are exposed to the outside through the opening 101. Since the inside and outside of the intake/exhaust valve 100 are ventilated only through the opening 101, the intake 113 and the exhaust 114 communicate with the outside through the common opening 101. In this embodiment, the exhaust port 114 is arranged closer to the open port 101 than the intake port 113.

As shown in FIG. 3, an intake passage 102 extending from the opening 101 to the intake 113 and an exhaust passage 103 extending from the exhaust 114 to the opening 101 are formed inside the cover 140. The intake flow path 102 and the exhaust flow path 103 indicate substantially the shortest paths from the intake port 113 and the exhaust port 114 to the open port 101, respectively, and intake and exhaust do not always occur according to these flow paths. Absent. The intake passage 102 passes from the opening 101 through an annular passage between the flange 141 b and the peripheral wall 111, and reaches the intake 113 through the coating space inside the cover 141. The exhaust flow path 103 passes from the exhaust port 114 through the coating space inside the cover part 141, passes through the annular passage between the flange part 141 b and the peripheral wall 111, and reaches the open port 101. That is, the intake flow passage 102 and the exhaust flow passage 103 partially overlap each other. An exhaust port 114 is arranged in the middle of the intake flow path 102 extending from the opening 101 to the intake port 113.

Between the upper wall 111 of the valve body 110 and the cover part 141 of the cover body 140, an air pool space 105 for temporarily retaining air from the internal space of the valve body 110 is formed inside. The intake port 113 and the exhaust port 114 are arranged at the boundary between the internal space of the valve body 110 and the air reservoir space 105. Since the opening 101 is located away from the opening of the exhaust port 114 and the exhaust flow path 103 is non-linear, it is effective inside the cover 141 without immediately diverging air to the outside of the intake/exhaust valve 100. It is possible to keep it. Further, since the intake port 113 is open toward the central portion of the air reservoir space 105 (that is, the radial center region of the cover part 141), during the negative pressure releasing operation, the intake port 113 is passed through the intake port 113. The air accumulated in the air accumulation space 105 can be efficiently sucked into the internal space of the valve body 110.

FIG. 12 is an exploded perspective view showing the drain pipe structure 10 in which the intake/exhaust valve 100 of the present embodiment is installed in the pipe path. As shown in FIG. 12, in this embodiment, two drainage pipes 11 are connected via a drainage pipe joint 12 that branches in three directions. The drainage pipe joint 12 has three connection ports, two drainage pipes 11 are connected to two of the connection ports, and one connection port opens upward. That is, the drainage pipe joint 12 is provided with a tubular portion 13 that is open to the outside and extends in the axial direction so as to form a communication path that communicates with the inside and outside of the piping material (the drainage pipe 11 or the drainage system). An intake/exhaust valve 100 is attached to the hollow cylindrical portion 13 so as to selectively close the communication passage. In the drainage pipe structure 10 of the present embodiment, the intake/exhaust valve 100 is installed such that its axial direction is along the vertical direction.

Next, the operation of the intake/exhaust valve 100 in the drain pipe structure 10 will be described with reference to FIGS. 13 and 14. The pressure of the drainage pipe structure 10 frequently fluctuates between positive pressure and negative pressure in response to an event such as water flowing in equipment (bath, toilet, etc.) upstream of the piping path.

FIG. 13 shows a form in which the piping path of the drainage pipe structure 10 has a positive pressure, and the exhaust valve body 130 of the intake/exhaust valve 100 has been activated to eliminate the positive pressure. As shown in FIG. 13, when the piping path of the drainage pipe structure 10 has a positive pressure, the exhaust valve body 130 is pushed by the internal pressure and tilts upward, and the exhaust port 114 is opened. Then, the compressed air in the internal space of the valve body 110 is discharged to the outside of the valve body 110 via the opened exhaust port 114. This discharge continues until the pressure in the internal space decreases and the exhaust valve body 130 returns to the closed position. The exhaust flow proceeds from the exhaust port 114 to the opening 101 along the exhaust flow path 103 shown in FIG. 3, and causes air to stay in the air reservoir space 105 covered by the cover 141. In particular, the odorous air in the pipe path of the drainage pipe structure 10 contains a gas lighter than air such as methane and ammonia. Therefore, the odorous air discharged from the piping route tends to rise along the vertical direction, and covers the upper surface of the valve body 110 before heading to the opening 101 that opens vertically downward. It is assumed that the air is trapped by 141 and stored in the air pool space 104. At least when the air storage space 104 is filled with exhaust gas, air is exhausted to the outside from the opening 101.

FIG. 14 shows a form in which the piping path of the drainage pipe structure 10 has a negative pressure, and the intake valve body 120 of the intake/exhaust valve 100 is actuated in order to eliminate the negative pressure. The form of FIG. 14 assumes a case where the piping path becomes negative pressure immediately after the positive pressure is released. As shown in FIG. 14, when the piping path of the drainage pipe structure 10 has a negative pressure, the intake valve body 120 moves downward and the intake port 113 is opened. Then, air is sucked into the internal space of the valve body 110 through the opened intake port 113. This suction continues until the pressure in the internal space rises and the intake valve body 120 returns to the closed position. The intake flow takes in the air outside the intake/exhaust valve 100 from the opening 101 to the intake 113 along the intake flow path 102 shown in FIG. 3, and also the air staying in the air storage space 105 to the intake 113. To send. In particular, since the intake port 113 is open toward the air reservoir space 105, the air accompanied by the odor accumulated in the air reservoir space 104 during the operation of the intake valve body 120 is transferred to the internal space via the intake port 113. Can be efficiently inhaled. That is, when at least a part of the air discharged from the exhaust port 114 when the positive pressure is released remains in the middle of the exhaust passage 103 and the intake valve body 120 operates as shown in FIG. 14, the air is discharged. Before all the air is discharged to the outside of the intake/exhaust valve 100, it is returned to the inside of the piping path again. As a result, in the drainage pipe structure 10 of the present embodiment, the amount of odorous air emitted outside the intake/exhaust valve 100 can be effectively reduced.

Here, the pressure fluctuation inside the actual piping route of the drainage system will be illustrated. It has been found that, under certain circumstances, the positive and negative pressures are interchanged within the piping path depending on the circumstances. FIG. 25 shows an example of a drainage system installed in a building on multiple floors. The illustrated drainage system is a five-story building, and at least one of a bathtub and a toilet is installed as drainage equipment on each floor. For example, in the drainage system of FIG. 25, when all the bathtubs are drained and the 5F and 3F toilets are drained at the same time in a steady flow state, as shown in FIG. 26, positive pressure and negative pressure are fine and continuous. A change in pressure was observed at the point P of the lowermost branch pipe.

In the drainage system of FIG. 25, as shown in FIG. 12, in order to eliminate the fluctuation range of the pressure that continuously changes to positive pressure and negative pressure, the tubular portion of the drainage pipe joint 12 arranged at or near the point P. An intake/exhaust valve can be installed via 13. Alternatively, although an example in which the intake/exhaust valve 100 is connected to the drain pipe joint 12 is shown in FIG. 12, the drain pipe joint of the indoor drain pipe is not limited to the form of FIG. The intake/exhaust valve 100 may be attached to a tubular portion (shown as P′ in FIG. 25) at the end of the ventilation pipe outdoors for use. In other words, a straight ventilation pipe is provided between the drain pipe joint and the intake/exhaust valve, and the drain pipe joint and the intake/exhaust valve are indirectly connected by the ventilation pipe. The intake/exhaust valve and the tubular portion may be connected by external fitting or internal fitting.

However, in such a situation, since the intake valve body and the exhaust valve body of the intake/exhaust valve continuously and frequently operate, for example, in the conventional intake/exhaust valve of Patent Document 1, the inside of the drain pipe structure is It was unavoidable that the odorous internal air was continuously discharged to the outside of the intake/exhaust valve, and a large amount of odor was filled in the room. On the other hand, in the intake/exhaust valve 100 and the drain pipe structure 10 of the present embodiment, under such a condition, the exhaust valve body 130 and the intake valve body 120 continuously operate without interposing hair, and the exhaust port 114 It is repeated that the discharged internal air is immediately sucked from the intake port 113. Therefore, the intake/exhaust valve 100 and the drain pipe structure 10 of the present embodiment can operate more effectively so as to prevent the leakage of odors in the situation where the positive pressure and the negative pressure are finely interchanged.

Hereinafter, the function and effect of the intake/exhaust valve 100 and the drain pipe structure 10 according to the embodiment of the present invention will be described.

According to the intake/exhaust valve 100 and the drain pipe structure 10 of the present embodiment, the intake flow path 102 extending from the opening 101 to the intake 113 and the exhaust passage 114 to the opening 101 formed inside the cover 140. The exhaust passage 103 extending up to partially overlaps with each other, the intake port 113 and the exhaust port 114 communicate with the outside air via the common opening port 101, and the intake port 113 and the exhaust port 114 are inside the valve body 110. It is characterized in that it is arranged at the boundary between the space and the air pool space 105 inside the cover body 140. In particular, in a state where the positive pressure and the negative pressure are finely changed in the inside of the pipe path of the drainage pipe 11, the exhaust valve body 130 and the intake valve body 140 are alternately operated to continuously eliminate the positive pressure and the negative pressure. You can Then, the internal air accompanied by the odor (in the piping path) discharged from the exhaust port 114 at the time of positive pressure is again discharged from the intake port 113 opened by the intake valve body 120 operating immediately after the positive pressure is released. It is returned to the inside. That is, the intake/exhaust valve 100 and the drain pipe structure 10 of the present embodiment remain inside the cover body 140 together with the outside air flowing from the opening 101 when the intake valve body 120 operates to eliminate the negative pressure. By sucking the internal air from the intake port 113, it is possible to effectively reduce the exhaust amount of the internal air accompanied by the odor.

The present invention is not limited to the above embodiment, and various other embodiments and modifications can be adopted. Hereinafter, another embodiment and modification of the present invention will be described. In addition, in each of the different embodiments, the components whose last two digits are common in the components indicated by the three digits have the same or similar characteristics unless otherwise described, and the description thereof is partially omitted.

[Second Embodiment]
15 to 19 show an intake/exhaust valve 200 of the second embodiment. As shown in FIGS. 15 to 17, the intake/exhaust valve 200 includes a valve body 210 connected to a piping path, an intake valve body 220 that operates to eliminate the negative pressure of the internal pressure of the valve body 210, and An exhaust valve body 230 that operates to eliminate the positive internal pressure of the valve body 210, and a cover body 240 attached to the valve body 210 so as to cover and protect the intake valve body 220 and the exhaust valve body 230. With. In the intake/exhaust valve 200 of the present embodiment, unlike the intake/exhaust valve 100 of the first embodiment, the exhaust port and the intake port are shared as the intake/exhaust port 2134, and the exhaust valve body 230 is provided on the intake valve body 220. In other words, the intake/exhaust port 2134 includes an exhaust port region and an intake port region.

The valve main body 210 has a hollow cylindrical shape whose both ends are open and which extends in the axial direction. The valve main body 210 includes a peripheral wall 211 that surrounds the internal space from the circumference in the axial direction, and an upper wall 212 that extends radially inward from an upper end portion of the peripheral wall 211. A connection portion 219 for connecting to the tubular portion 23 (see FIGS. 18 and 18) of the drainage pipe structure 20 is provided at a lower portion of the peripheral wall 211.

The upper wall 212 extends so as to close the inner space from the upper side in the axial direction, and has an outer surface facing the outside air side and an inner surface facing the inner space. The lower surface of the upper wall 212 functions as a valve seat for receiving the intake valve body 220. An intake/exhaust port 2134 for communicating the inside and outside of the valve body 210 is provided at the center of the upper wall 212 in the radial direction. In the present embodiment, the intake/exhaust port 2134 also serves as both the intake port and the exhaust port. In other words, the valve body 211 has an intake port and an exhaust port as the intake/exhaust port 2134. The intake/exhaust port 2134 is a circular opening formed in the radial center of the upper wall 212. The intake/exhaust port 2134 is opened upward in the axial direction. A valve seat surface for the intake valve body 220 is defined on the lower surface of the peripheral edge of the intake/exhaust port 2134 of the upper wall 212. The intake/exhaust port 2134 is constantly closed by both the intake valve body 220 and the exhaust valve body 230. The intake/exhaust port 2134 is opened according to the operation of the intake valve body 220, and air is taken into the internal space from the outside of the valve body 211 via the intake/exhaust port 2134. On the other hand, the intake/exhaust port 2134 is opened according to the operation of the exhaust valve body 230, and the air is exhausted to the outside from the internal space of the valve body 211 via the intake/exhaust port 2134.

Further, a body-side magnet holding portion 216 for holding the body-side magnet M1 is provided substantially at the center in the radial direction of the peripheral wall 211. The body-side magnet holding portion 216 holds the body-side magnet M1 by three beam-shaped portions extending from the inner peripheral surface of the peripheral wall 211 toward the radial center. Further, at the center of the main body side magnet holding portion 216 in the radial direction, there is provided a shaft holding portion which vertically penetrates and slidably inserts the valve shaft 222 of the intake valve body 220. That is, the shaft holding portion has a shaft hole. Then, in the main body side magnet holding portion 216, the annular main body side magnet M1 is fitted and held in the groove around the shaft holding portion. The main body side magnet M1 is made of a permanent magnet such as a neodymium magnet, and functions so as to exert a repulsive force on a valve side magnet M2 described later.

A connecting portion 218 for attaching the cover body 240 to the valve body 210 is provided on the outer periphery of the peripheral wall 211. The connecting portion 218 is a beam body that extends radially outward from the outer peripheral surface of the peripheral wall 211, and is configured to mount and hold the cover body 240 thereon.

The intake valve body 220 is housed in an internal space surrounded by the peripheral wall 211, and is supported by the valve body 210 so as to move the intake and exhaust ports 2134 along the axial direction so as to be openable and closable. That is, the intake valve body 220 steadily closes the intake/exhaust port 2134, and as shown in FIG. 19, moves downward in the axial direction when the internal space (piping path) of the valve body 210 changes to negative pressure. Thus, the intake/exhaust port 2134 is opened, and the intake/exhaust port 2134 operates as an intake port.

More specifically, the intake valve body 220 includes a closing portion 221 formed in a circular plate shape and an annular shape in a plan view, a valve shaft 222 extending downward at the center of the closing portion 221, and an upper end of the valve shaft 222. The formed valve-side magnet holding portion 223 is provided. A valve side contact surface is formed on the outer peripheral upper surface of the closing portion 221. As shown in FIG. 17, the valve-side contact surface faces the valve seat surface of the valve body 210. As shown in FIG. 17, the valve shaft 222 is arranged on the central axis of the intake/exhaust port 2134 and penetrates the shaft holding portion of the body-side magnet holding portion 216 of the valve body 210. A valve-side magnet holding portion 223 is provided at the upper end of the valve shaft 222 so as to be located above the body-side magnet holding portion 216. That is, the valve-side magnet M2 is fixed to the tip of the valve shaft 222. The valve-side magnet M2 is a permanent magnet such as a neodymium magnet. The intake valve body 220 of the present embodiment opens and closes the intake/exhaust port 2134 by the magnetic repulsive force of the magnets M1 and M2. An opening 225 is provided in the center of the closed portion 221 of the intake valve body 220 so that the intake/exhaust port 2134 functions as an exhaust port. The opening 225 is always closed by the exhaust valve body 230.

The exhaust valve body 230 is arranged on the closing part 221 of the intake valve body 220 so as to cover the opening 225 of the intake valve body 220 from above (outside the valve body 210). The exhaust valve body 230 includes a plate-shaped closing portion 231 that covers the opening 225 (a region of the exhaust port), and a valve shaft 232 that extends downward from the center of the plate-shaped closing portion 231. The exhaust valve body 230 steadily closes the intake/exhaust port 2134 in cooperation with the intake valve body 220 by closing the opening 225 in the closed position. As shown in FIG. 18, when the internal space (piping path) of the valve body 210 changes to a positive pressure, it rises from the closing part 221 of the intake valve body 220 and opens the intake/exhaust port 2134 together with the opening part 225. The intake/exhaust port 2134 operates so as to function as an exhaust port.

As shown in FIG. 17, the cover body 240 covers the valve body 210 from above in order to protect or protect the inside of the valve body 210, the intake valve body 220, and the exhaust valve body 230 from dust. That is, the cover body 240 is configured to be connected to the valve body 210 to cover the intake/exhaust port 2134 from the outside and form the open port 201 open to the outside air. The cover body 240 has a dome-shaped or roof-shaped cover portion 241. The cover portion 241 includes a top wall portion 241a extending to cover the intake/exhaust port 2134 from above in the axial direction, and a flange portion 241b extending to surround the intake/exhaust port 2134 in a direction orthogonal to the axial direction. Equipped with. With the cover body 240 attached to the valve body 210, the opening 201 is formed at the tip of the flange portion 241b.

That is, the intake/exhaust valve 200 includes a connecting portion 219 connected to the pipe path, an intake port (intake/exhaust port 2134) for taking in outside air into the pipe path, and an exhaust port (for discharging exhaust gas from the pipe path ( The valve body 211 having the intake/exhaust port 2134) and the intake port (intake/exhaust port 2134) are constantly closed, and the intake port (intake/exhaust port 2134) is opened when the piping path changes to negative pressure. An exhaust valve that operates to constantly close the operating intake valve body 220 and the exhaust port (intake/exhaust port 2134) and open the exhaust port (intake/exhaust port 2134) when the piping path changes to a positive pressure. A body 230 and a cover body 240 that is connected to the valve body 210 and covers the intake port (intake/exhaust port 2134) and the exhaust port (intake/exhaust port 2134) from the outside to form the open port 201 opened to the outside air. Prepare

As shown in FIG. 17, in a steady state, the intake/exhaust port 2134 opened in the radial center is closed by the intake valve body 220 and the exhaust valve body 230. When the internal space of the valve body 210 (the space on the piping path side of the intake/exhaust port 2134) becomes negative pressure, the intake valve body 220 is pushed down to suck the outside air from the intake/exhaust port 2134 to eliminate the negative pressure. At this time, the exhaust valve body 230 moves integrally while closing the opening 225 of the intake valve body 220. On the other hand, when the internal space of the valve body 210 has a positive pressure, the exhaust valve body 230 floats above the intake valve body 220, and the air in the internal space is discharged from the opening 225 and the intake/exhaust port 2134 to eliminate the positive pressure. It At this time, the intake valve body 220 is biased so as to come into contact with the valve seat surface of the valve body 210.

As shown in FIG. 17, an intake passage 202 extending from the opening 201 to the intake/exhaust opening 2134 and an exhaust passage 203 extending from the intake/exhaust opening 2134 to the opening 201 are formed inside the cover body 240. .. The intake flow path 202 and the exhaust flow path 203 show a substantially shortest path from the intake/exhaust port 2134 to the open port 201, and intake/exhaust does not always occur along these flow paths. The intake passage 202 passes through the annular passage between the opening 201 and the flange portion 241b and the peripheral wall 211, passes through the coating space inside the cover 241, and reaches the intake/exhaust port 2134. The exhaust flow path 203 passes from the intake/exhaust port 2134 through the coating space inside the cover portion 241, passes through the annular passage between the flange portion 241b and the peripheral wall 211, and reaches the open port 201. That is, the intake flow passage 202 and the exhaust flow passage 203 almost completely overlap each other.

Between the upper wall 211 of the valve body 210 and the cover 241 of the cover body 240, an air pool space 205 is formed inside for temporarily retaining air from the internal space of the valve body 210. An intake/exhaust port 2134 functioning as an intake port and an exhaust port is arranged at the boundary between the internal space of the valve body 210 and the air trap space 205. Since the opening 201 is located away from the opening direction of the intake/exhaust port 2134 and the exhaust flow path 203 is non-linear, the air is not diffused to the outside of the intake/exhaust valve 200 immediately inside the cover 241. It can be effectively stopped. Further, since the intake/exhaust port 2134 opens toward the central portion of the air reservoir space 205 (that is, the radial center region of the cover 141), the air reservoir space 205 is opened via the intake/exhaust port 2134. It is possible to efficiently suck the air accumulated in the valve body 210 into the internal space of the valve body 210.

FIG. 18 shows a mode in which the piping path of the drainage pipe structure 20 has a positive pressure, and the exhaust valve body 230 of the intake/exhaust valve 200 has been activated to eliminate the positive pressure. As shown in FIG. 18, when the piping path of the drainage pipe structure 20 has a positive pressure, the exhaust valve body 230 is pushed by the internal pressure and floats upward, and the intake/exhaust port 2134 (exhaust port region) is opened. Then, the compressed air in the internal space of the valve body 210 is discharged to the outside of the valve body 210 through the opened intake/exhaust port 2134. This discharge continues until the pressure in the internal space decreases and the exhaust valve body 230 returns to the closed position. The exhaust flow goes from the intake/exhaust port 2134 to the open port 201 along the exhaust flow path 203 shown in FIG. 17, and causes air to stay in the air reservoir space 205 covered by the cover portion 241. At least when the air storage space 204 is filled with exhaust gas, air is exhausted from the opening 201 to the outside.

FIG. 19 shows a form in which the piping path of the drainage pipe structure 20 has a negative pressure, and the intake valve body 220 of the intake/exhaust valve 200 is actuated in order to eliminate the negative pressure. The form of FIG. 19 assumes a case where the piping path becomes negative pressure immediately after the positive pressure is released. As shown in FIG. 19, when the piping path of the drainage pipe structure 20 has a negative pressure, the intake valve body 220 moves downward, and the intake/exhaust port 2134 (intake port region) is opened. Then, air is sucked into the internal space of the valve body 210 through the opened intake/exhaust port 2134. This suction continues until the pressure in the internal space rises and the intake valve body 220 returns to the closed position. The intake flow takes in the air outside the intake/exhaust valve 200 from the opening 201 to the intake/exhaust port 2134 along the intake flow path 202 shown in FIG. 17, and also takes in the air accumulated in the air reservoir space 205. Take him to 2134. In particular, since the intake/exhaust port 2134 is opened toward the air reservoir space 205, the air accompanied by the odor accumulated in the air reservoir space 2104 during the operation of the intake valve body 220 passes through the intake/exhaust port 2134 into the internal space. Can be efficiently sucked into. That is, when at least a part of the air discharged when the positive pressure is released remains in the middle of the exhaust flow path 203 and the intake valve body 220 operates as shown in FIG. 19, all the discharged air is discharged. Before being discharged to the outside of the intake/exhaust valve 200, it is returned to the inside of the piping path again. As a result, in the drainage pipe structure 20 of the present embodiment, the amount of odorous air emitted outside the intake/exhaust valve 200 can be effectively reduced.

[Third Embodiment]
20 to 24 show the intake/exhaust valve 300 of the third embodiment. As shown in FIGS. 20 to 22, the intake/exhaust valve 300 includes a valve body 310 connected to a piping path, an intake valve body 320 that operates to eliminate the negative pressure of the internal pressure of the valve body 310, and An exhaust valve body 330 that operates to eliminate the positive internal pressure of the valve body 310, and a cover body 340 attached to the valve body 310 so as to cover and protect the intake valve body 320 and the exhaust valve body 330. With. The intake/exhaust valve 300 of the present embodiment is different from the intake/exhaust valve 100 of the first embodiment in the positional relationship and shape of each component.

The valve main body 310 has a hollow cylindrical shape whose both ends are open and which extends in the axial direction. The valve main body 310 includes a peripheral wall 311 that surrounds the internal space from the axial periphery, and an upper wall 312 that extends radially inward from an upper end portion of the peripheral wall 311. A connection portion 319 for connecting to the tubular portion 33 (see FIGS. 23 and 23) of the drainage pipe structure 30 is provided at a lower portion of the peripheral wall 311.

The upper wall 312 extends in a longitudinal shape so as to close the inner space from the upper side in the axial direction, and has an outer surface facing the outside air side and an inner surface facing the inner space. The lower surface and the upper surface of the upper wall 312 function as valve seats for receiving the intake valve body 320 and the exhaust valve body 330, respectively. As shown in FIG. 22, the upper wall 312 is provided with an intake port 313 and an exhaust port 314 for communicating the inside and outside of the valve body 310. The intake port 313 is a circular opening formed in a region of the upper wall 312 on one end side in the longitudinal direction. The intake port 313 is open axially upward. The intake port 313 is constantly closed by the intake valve body 320. The intake port 313 is opened according to the operation of the intake valve body 320, and air is taken into the internal space from the outside of the valve body 311 via the intake port 313. On the other hand, the exhaust port 314 is a circular opening formed in a region on the other end side in the longitudinal direction of the upper wall 312, as shown in FIG. The exhaust port 314 is open upward in the axial direction. The exhaust port 314 is divided into a plurality of openings by a beam that extends radially in the radial direction. The exhaust port 314 is constantly closed by the exhaust valve body 330. The exhaust port 314 is opened according to the operation of the exhaust valve body 330, and the air is exhausted from the internal space of the valve body 311 to the outside through the exhaust port 314.

In addition, as shown in FIG. 21A, a main body side magnet holding portion 316 for holding the main body side magnet M1 is provided substantially at the center of the intake port 313 in the radial direction. Similar to the first embodiment, the main body side magnet M1 is made of a permanent magnet such as a neodymium magnet and functions to exert a repulsive force on the valve side magnet M2 and the intermediate magnet M3. On the other hand, as shown in FIG. 21D, an annular body 314a for inserting and holding the valve shaft 332 of the exhaust valve body 330 is provided substantially at the center of the exhaust port 314 in the radial direction. The annular body 314a is supported at the center of the exhaust port 314 by four beam-shaped bodies 314b extending from the inner peripheral surface of the exhaust port 314.

The intake valve body 320 is housed in the internal space surrounded by the peripheral wall 311, and is supported by the valve body 310 so as to move the intake port 313 along the axial direction so that the intake port 313 can be opened and closed. That is, the intake valve body 320 operates to steadily close the intake port 313 and open the intake port 313 when the internal space (piping path) of the valve body 110 changes to negative pressure. The structure of the intake valve body 320 is the same as that of the first embodiment, and the description thereof is omitted.

The exhaust valve body 330 is supported by the upper wall 312 so as to cover the exhaust port 314 from above (outside the valve body 310). That is, the exhaust valve body 330 operates to steadily close the exhaust port 314 and open the intake port 314 when the internal space (piping path) of the valve body 310 changes to a positive pressure.

More specifically, the exhaust valve body 330 includes a plate-shaped closing portion 331 that covers the exhaust port 314, and a valve shaft 332 that extends downward from the center of the plate-shaped closing portion 331. The valve shaft 332 is externally inserted into the annular body at the center of the exhaust port 3114 and is supported so as to be movable in the axial direction. Then, the exhaust valve body 330 constantly closes the exhaust port 314 in the vertical direction due to gravity. On the other hand, when the internal space of the valve body 310 becomes a positive pressure, an upward force (outward direction) acts on the plate-shaped closing portion 321 of the exhaust valve body 330. When this force exceeds gravity, the exhaust valve body 330 floats upward in the axial direction, the valve side contact surface is separated from the valve seat surface, and the exhaust port 314 is opened (see FIG. 23). When air is blown out from the exhaust port 314 and the pressure in the internal space of the valve body 310 drops, the exhaust valve body 320 vertically descends due to the action of gravity and returns to the original closed position.

The cover body 340 covers the valve body 310 from above in order to protect or dust-protect the inside of the valve body 310, the intake valve body 320, and the exhaust valve body 330. That is, the cover body 340 is connected to the valve body 310 to cover the intake port 313 and the exhaust port 314 from the outside, and is configured to form the opening 301 that is open to the outside air.

As shown in FIGS. 20 to 22, the cover body 340 includes a roof-shaped cover portion 341 having an oval shape in plan view. The cover portion 341 surrounds the top wall portion 341a extending in a flat plate shape so as to cover the intake port 313 and the exhaust port 314 from above in the axial direction, and the intake port 313 and the exhaust port 314 from a direction orthogonal to the axial direction. Thus, the flange portion 341b is extended. A part of the leading edge of the flange portion 341b is integrally connected to the valve body 310, and the opening 301 is formed at one end in the longitudinal direction thereof.

As shown in FIG. 22, in the steady state, the intake port 313 opened in the radial center is closed by the intake valve body 320, and the exhaust port 314 arranged adjacent to the intake port 313 is closed by the exhaust valve body 330. ing. When the internal space of the valve body 310 (the space on the piping path side of the intake port 313 and the exhaust port 314) becomes negative pressure, the intake valve body 320 is pushed down to suck the outside air from the intake port 313 to eliminate the negative pressure. It At this time, the exhaust valve body 330 keeps the exhaust port 314 closed. On the other hand, when the internal space of the valve body 310 has a positive pressure, the exhaust valve body 330 floats and the air in the internal space is discharged from the exhaust port 314, so that the positive pressure is released. At this time, the intake valve body 320 keeps closing the intake port 313.

Further, the cover portion 341 of the cover body 340 covers the intake port 313 and the exhaust port 314 in a roof shape so as not to be exposed to the outside. In particular, the top wall portion 341a covers the intake port 313 and the exhaust port 314 from above in the axial direction, and the flange portion 341b covers the intake port 313 and the exhaust port 314 in the direction orthogonal to the axial direction. That is, the covering portion 341 forms a covering space that closes the upper surface of the valve body 310 from above in the axial direction inside the covering portion 341. An opening 301 is formed at the lower end of the flange portion 341b on one end side in the longitudinal direction of the cover body 340. The exhaust port 314 is covered by the cover body 340 so as not to be exposed to the outside. Since the inside and outside of the intake/exhaust valve 300 are ventilated only through the opening 301, the intake 313 and the exhaust 314 communicate with the outside air through the common opening 301. In this embodiment, the intake port 313 is arranged closer to the open port 301 than the exhaust port 314.

Inside the cover body 340, as shown in FIG. 22, an intake passage 302 extending from the opening 301 to the intake 313 and an exhaust passage 303 extending from the exhaust 314 to the opening 301 are formed. It should be noted that the intake flow path 302 and the exhaust flow path 303 indicate substantially the shortest paths from the intake port 313 and the exhaust port 314 to the open port 301, respectively, and intake and exhaust may not necessarily occur according to these flow paths. Absent. The intake passage 302 extends from the opening 301 to the intake 313 through the coating space inside the cover 141. The exhaust flow path 303 passes from the exhaust port 314 through the coating space inside the cover 341, passes over the intake port 313, and reaches the open port 301. That is, the intake passage 302 and the exhaust passage 303 partially overlap each other. The intake port 313 is arranged in the middle of the exhaust flow path 302 extending from the exhaust port 314 to the open port 301.

Between the upper wall 311 of the valve body 310 and the cover portion 341 of the cover body 340, an air pool space 305 is formed inside for temporarily retaining air from the internal space of the valve body 310. The intake port 313 and the exhaust port 314 are arranged at the boundary between the internal space of the valve body 310 and the air reservoir space 305. Since the opening 301 is located away from the opening of the exhaust port 314 and the exhaust flow path 303 is non-linear, it is effective inside the cover 341 without immediately diverging air to the outside of the intake/exhaust valve 300. It is possible to keep it. Further, since the intake port 313 is disposed between the exhaust port 314 and the opening port 301, the air accumulated in the air pool space 305 can be efficiently fed into the internal space of the valve body 310 before exiting from the opening port 301. It is possible to aspirate.

FIG. 23 shows a form in which the piping path of the drainage pipe structure 30 has a positive pressure, and the exhaust valve body 330 of the intake/exhaust valve 300 has been activated to eliminate the positive pressure. As shown in FIG. 23, when the piping path of the drainage pipe structure 20 has a positive pressure, the exhaust valve body 330 is pushed by the internal pressure and floats upward, and the exhaust port 314 is opened. Then, the compressed air in the internal space of the valve body 310 is discharged to the outside of the valve body 310 through the opened exhaust port 314. This discharge continues until the pressure in the internal space decreases and the exhaust valve body 330 returns to the closed position. The exhaust flow goes from the exhaust port 314 to the open port 301 along the exhaust flow path 303 shown in FIG. 22, and causes air to stay in the air reservoir space 305 covered by the cover portion 341. At least when the air storage space 304 is filled with exhaust gas, air is exhausted from the opening 301 to the outside. In this embodiment, since the distance between the exhaust port 314 and the open port 301 is relatively long, it is possible to retain the air discharged from the internal space for a long time by the air reservoir space 304.

FIG. 24 shows a form in which the piping path of the drainage pipe structure 30 has a negative pressure, and the intake valve body 320 of the intake/exhaust valve 300 has been operated to eliminate the negative pressure. The form of FIG. 24 assumes a case where the piping path becomes negative pressure immediately after the positive pressure is released. As shown in FIG. 24, when the piping path of the drainage pipe structure 30 has a negative pressure, the intake valve body 320 moves downward and the intake port 313 is opened. Then, air is sucked into the internal space of the valve body 310 through the opened intake port 313. This suction continues until the pressure in the internal space rises and the intake valve body 320 returns to the closed position. The intake flow takes in the air outside the intake/exhaust valve 300 from the opening 301 to the intake 313 along the intake flow path 302 shown in FIG. 22 and also collects the air accumulated in the air reservoir space 305 to the intake 313. To send. Since the exhaust passage 303 passes above the intake port 313, the internal air is easily captured by the intake port 313 before being discharged from the open port 301. That is, when at least a part of the air exhausted when the positive pressure is released remains in the middle of the exhaust flow path 303 and the intake valve body 320 operates as shown in FIG. Before being discharged to the outside of the intake/exhaust valve 300, it is returned to the inside of the piping path again. As a result, in the drainage pipe structure 30 of the present embodiment, the amount of odorous air emitted outside the intake/exhaust valve 300 can be effectively reduced.

[Modification]
(1) The intake/exhaust valve of the present invention can be applied not only to the drainage system but also to various applications for suppressing the pressure fluctuation inside the piping path. For example, the intake/exhaust valve may be installed in other structures such as a water supply pipe and a gas pipe, if necessary.

(2) In the present embodiment, the intake valve body of the intake/exhaust valve is biased in the closing direction by the repulsive force of the magnet, but the present invention is not limited to this. For example, the biasing of the valve element may be performed by another mechanism such as a spring within the scope of the present invention. Alternatively, both the intake valve body and the exhaust valve body may be elastic sheet pieces like the exhaust valve body 130 of the first embodiment.

(3) The intake/exhaust valve of the present invention is not limited to the shape and size of the above embodiment, and can be modified into various shapes and sizes. For example, the peripheral wall of the valve body may be bent, and the axis of the valve body on the upper wall side and the axis of the connecting portion may extend in different directions. The opening may not be formed between the valve body and the cover body, and may be, for example, a through hole formed in the cover body.

The present invention is not limited to the above-described embodiments and modified examples, and can be implemented in various modes within the technical scope of the present invention. That is, within the technical scope of the present invention, a part of the configuration of this embodiment may be omitted or modified, or another configuration may be added.

[Appendix]
A further invention is extracted from the above-described embodiment and added to the description. The technical concept of the above-described coupling mechanism can be applied to all ventilation devices including an intake valve, an exhaust valve, etc., in addition to the intake and exhaust valves. That is, when the attachment body (corresponding to the cover body of the above embodiment) is locked and assembled to the adherend (corresponding to the valve body of the above embodiment) in both the circumferential direction and the axial direction, the attachment body It is necessary to dispose the engaging portion (corresponding to the connecting piece and the claw portion in the above-described embodiment) at a predetermined circumferential position that can engage with the engaged portion of the attached body. There has been a problem that the work of aligning the attached body with respect to the attached body in the circumferential direction becomes particularly difficult when the positional relationship between the engaging portion and the engaged portion cannot be visually observed. In order to solve the problem, some configurations listed below are presented.

[Configuration 1]
A connecting structure for an adherend and an adherend,
An attached body (valve body 110) having a cylindrical outer peripheral surface and an engaged portion (horizontal restriction wall 118c) formed on the outer peripheral surface, and an engaging portion engaging with the engaged portion. And an attachment body (cover body 140) that is fixed to the attachment body by engaging with the engagement portion.
The object to be attached and the object to be attached can be relatively rotated about the axis of the cylinder of the object to be attached while guiding the relative position of the axis in the axial direction so as not to be displaced. A guide portion (rail 118a) slidably contacting is provided along the cylindrical outer peripheral surface,
At least one of the engaging portion and the engaged portion is elastically deformable in a radial direction of a cylinder of the adherend, and the attachable body and the attachable body are relatively moved to the axial center. Is elastically deformed by approaching in the axial direction of, and elastically returns at the engaging position to engage both engaging portions,
At the engagement positions of the both engagement portions, a regulation portion (vertical regulation wall 118b, regulation claw 118d) that regulates relative rotation about the cylindrical axis of the adherend is provided,
A part of the guide portion in the circumferential direction is missing, and the missing portion (a gap between the rails 118a) is a position (a position outside the housing 118f in the axial direction) that allows the approach in the axial direction. The connecting structure is located at a position (inside the housing portion 118f) that enables engagement by the proximity of both the engaging portions in the axial direction.

In the above configuration 1, when the attached body and the attached body are relatively rotated so as to slide along the guide portion, the engagement portion is guided to the missing portion. The engagement portion is arranged at a position that allows the missing portion to approach in the axial direction, and is in a coupling position that engages with the engaged portion (a position that enables engagement by both the engagement portions in the axial direction). ) Is moved to. That is, even if the positional relationship between the engaging portion and the engaged portion cannot be confirmed, the attached body can be easily connected to the attached body. This configuration 1 embodies a mode (see FIG. 11) of the coupling mechanism of the first embodiment in which the claw portion 142b goes over the horizontal regulation wall 118c and enters the housing portion 118f along the axial direction. In the configuration, the configuration that enables the circumferential movement from the introduction portion 118e to the accommodation portion 118f may be omitted.

[Configuration 2]
A connecting structure for an adherend and an adherend,
The attached body (valve main body 110) having a cylindrical outer peripheral surface and formed with the engaged portions (vertical restricting walls 118b, restricting claws 118d) protruding from the outer peripheral surface, and the adherent are An engaging portion (claw portion 142b) that has a cylindrical portion (peripheral wall 111) to be inserted and that engages with the engaged portion at the tip side of an elastic piece (connecting piece 142) that elastically deforms in the radial direction of the cylindrical portion. ) Is formed on the attachment body (cover body 140),
A restriction wall (vertical restriction wall) that restricts the engaging portion from being disengaged in the circumferential direction from the engaging portion with the engaged portion, on both sides of the outer peripheral surface of the engaged portion in the circumferential direction. 118b, a regulating pawl 118d), and at least one of the regulating walls is an inclined surface (an inclined surface of the regulating pawl 118d) that is elastically deformed to receive the engaging portion from the outer side in the circumferential direction with respect to the engaged portion. ) Is formed,
In the axial direction of the cylindrical portion, in front of the position where the inclined surface and the engaging portion match (the axial position of the introduction portion 118e) in the insertion direction of the adherend, before the vehicle gets over the inclined surface. Except for the position (introduction part 118e), the relative rotation of the attachment body and the adherend body is fixed with the relative axial position fixed (or not displaced) about the axis of the cylindrical portion as an axis. A connecting structure characterized in that a sliding contact portion (rail 118a) that allows movement is provided.

In the above configuration 2, when the attached body and the attached body are relatively rotated via the sliding contact portion, the engaging portion is guided to a position that matches the inclined surface. The engaging portion is arranged at a position that matches the inclined surface, and by moving over the inclined surface, it is moved to the engaged portion between the pair of restriction walls. That is, even if the positional relationship between the engaging portion and the engaged portion cannot be confirmed, the attached body can be easily connected to the attached body. This configuration 2 embodies a mode (see FIG. 9) in which the claw portion 142b goes over the restriction claw 118d and enters the housing portion 118f along the circumferential direction in the coupling mechanism of the first embodiment. In the configuration, a configuration that allows the accommodation portion 118f to enter in the axial direction may be omitted.

[Configuration 3]
A connection mechanism for connecting the attachment body to the attachment body having a cylindrical outer peripheral surface in a lock manner,
A connecting piece having a shaft portion protruding from the attachment body toward the attachment body, and a claw portion protruding from the shaft portion and elastically displaceable;
An accommodating portion that is formed at a predetermined position around the adherend and that forms a space for accommodating the claw portion in a locked state,
A space is provided continuously in the circumferential direction with respect to the accommodating portion, opened to the outside in the axial direction so as to allow axial movement of the claw portion, and has a space for introducing the claw portion from the circumferential direction into the accommodating portion. An introduction part to be formed,
Formed on the adherend, restricting movement of the claw portion in the axial direction and the circumferential direction when the claw portion is arranged in the housing portion, and the claw portion is arranged in the introduction portion. Sometimes a restricting portion that allows movement of the claw portion from the introducing portion to the accommodating portion,
A plurality of rails that extend along the circumferential direction from the peripheral wall of the adherend and are spaced apart from each other so as to form a gap at the position of the accommodation portion and the introduction portion;
The position of the connecting piece and the position of the introduction portion are formed in the cover body so as to come into axial contact with the rail in a state of being displaced in the circumferential direction, and by sliding in the circumferential direction on the rail, A guide part for guiding the connecting piece to the introducing part, and a connecting mechanism.

In the above configuration 3, the coupling mechanism guides the coupling piece to the introduction portion by the guide means (guide portion and rail) that guides the coupling piece to a predetermined coupling position, and the claw portion of the coupling piece arranged in the introduction portion. Is moved circumferentially into the accommodating part via the restricting part (allowing movement from the introducing part to the accommodating part), and the claw part is locked in the accommodating part by the restricting part, resulting in an attachment body. Can be assembled to the adherend. Even if the positional relationship between the connecting piece and the introducing portion cannot be confirmed, the attached body can be easily connected to the attached body. That is, the connecting mechanism allows the worker to attach the cover body to the adherend only by rotating the cover body, and greatly improves the work efficiency in attaching and detaching the attachable body.

[Configuration 4]
In Configuration 3, the restricting portion includes a horizontal restricting wall that extends in the axial direction outside of the accommodating portion in the circumferential direction and restricts movement of the claw portion arranged in the accommodating portion toward the axially outer side, The horizontal regulation wall may be configured to allow the claw portion to move axially from the outside to the inside of the accommodating portion.

10 Drain Pipe Structure 11 Drain Pipe 12 Drain Pipe Joint 13 Cylindrical Part 100 Intake/Exhaust Valve 101 Open Port 102 Intake Flow Path 103 Exhaust Flow Path 105 Air Reservoir Space 110 Valve Body 111 Peripheral Wall 112 Upper Wall 113 Intake Port 114 Exhaust Port 115 Annular Packing 116 Main body side magnet holding portion 117 Main body side net sheet attachment portion 118 Connection portion 118a Rail 118b Vertical regulation wall (regulation portion)
118c Horizontal control wall (control section)
118d Control claw (control section)
118e Introductory part 118f Storage part 119 Connection part 120 Intake valve body 121 Closing part 122 Valve shaft 123 Valve side magnet holding part 124 Intermediate magnet holding body 130 Exhaust valve body 131 Belt-like closing part 132 Fixed end part 140 Cover body 141 Cover part 141a Top Wall part 141b Flange part 142 Connection piece 142a Shaft part 142b Claw part 143 Guide step part 144 Engagement step part 145 Cover body side net sheet attachment part M1 Main body side magnet M2 Valve side magnet M3 Intermediate magnet

Claims (12)

A valve body having a connecting portion connected to a pipe path, an intake port for taking in outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path;
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
An intake passage extending from the opening to the intake and an exhaust passage extending from the exhaust to the opening are formed inside the cover, and the intake passage and the exhaust passage are at least An intake/exhaust valve characterized by being partially overlapped. A valve body having a connecting portion connected to a pipe path, an intake port for taking in outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path;
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
An intake/exhaust valve, wherein the intake port and the exhaust port communicate with the outside air via a common opening. A valve body having a connecting portion connected to a pipe path, an intake port for taking in outside air into the pipe path, and an exhaust port for discharging exhaust gas from the pipe path;
An intake valve body that constantly closes the intake port and operates to open the intake port when the piping path changes to a negative pressure,
An exhaust valve body that constantly closes the exhaust port and operates to open the exhaust port when the piping path changes to a positive pressure,
A cover body that is connected to the valve body and covers the intake port and the exhaust port from the outside to form an open port open to the outside air,
An air pool space for temporarily retaining air from the internal space of the valve body is formed between the cover body and the valve body, and the intake port and the exhaust port are the internal space of the valve body. A drain pipe structure, wherein the drain pipe structure is arranged at a boundary between the air storage space and the air storage space. The intake/exhaust valve according to any one of claims 1 to 3, wherein the intake port is arranged in the middle of an exhaust flow path extending from the exhaust port to the open port. The intake/exhaust valve according to any one of claims 1 to 3, wherein the exhaust port is arranged in the middle of an intake flow path extending from the opening port to the intake port. The intake/exhaust valve according to claim 1, wherein the exhaust port is covered with the cover body so as not to be exposed to the outside. The cover body has a dome-shaped or roof-shaped cover portion so as to internally form an air storage space for temporarily retaining air from the internal space of the valve body, and the opening is provided with the valve body. The intake/exhaust valve according to claim 1, wherein the intake/exhaust valve is formed in a gap with the cover body. The valve body is a tubular body extending in the axial direction, and the intake port and the exhaust port are opened upward in the axial direction,
The cover portion extends from the top wall portion so as to cover the intake port and the exhaust port from above in the axial direction, and extends so as to surround the intake port and the exhaust port in a direction orthogonal to the axial direction. 8. The intake/exhaust valve according to claim 7, wherein the opening is formed at a front end of the flange. The intake/exhaust valve according to any one of claims 1 to 8, wherein the intake valve body is configured to operate with a pressure difference smaller than that of the exhaust valve body. Further comprising a connecting mechanism for connecting the cover body to the valve body,
The connection mechanism is
A connecting piece having a shaft portion protruding from the cover body toward the valve body, and a claw portion protruding from the shaft portion and elastically displaceable;
An accommodating portion formed at a predetermined position around the valve body and forming a space for accommodating the claw portion in a locked state,
A space is provided continuously in the circumferential direction with respect to the accommodating portion, opened to the outside in the axial direction so as to allow axial movement of the claw portion, and has a space for introducing the claw portion from the circumferential direction into the accommodating portion. An introduction part to be formed,
When the pawl portion is formed in the valve body and restricts the movement of the pawl portion in the axial direction and the circumferential direction when the pawl portion is arranged in the housing portion, and when the pawl portion is arranged in the introducing portion, A restriction portion that allows movement of the claw portion from the introduction portion to the accommodation portion,
A plurality of rails extending along the circumferential direction from the peripheral wall of the valve body and spaced apart from each other so as to form a gap at the position of the accommodation portion and the introduction portion;
The position of the connecting piece and the position of the introduction portion are formed in the cover body so as to come into axial contact with the rail in a state of being displaced in the circumferential direction, and by sliding in the circumferential direction on the rail, The intake/exhaust valve according to any one of claims 1 to 9, further comprising: a guide portion that guides the connecting piece to the introduction portion. The restricting portion includes a horizontal restricting wall that extends in the circumferential direction on the outer side in the axial direction of the accommodating part and restricts movement of the claw part arranged in the accommodating part to the outer side in the axial direction. The intake/exhaust valve according to claim 10, wherein the claw portion is configured to allow movement of the claw portion from the outer side to the inner side of the accommodating portion along the axial direction. A drainage pipe having a tubular portion formed at one end to form a piping path inside,
The intake/exhaust valve according to any one of claims 1 to 9, which is connected to the tubular portion,
When the pipe path continuously changes from a steady state to a positive pressure and a negative pressure, the exhaust valve body of the intake/exhaust valve opens the exhaust port and discharges air according to the change from the steady state to the positive pressure. The exhaust valve body closes the exhaust port and the intake valve body opens the intake port in accordance with the change from the pressure to the negative pressure, and at least a part of the air discharged from the exhaust port is introduced into the piping path. A drainage pipe structure characterized by sucking in.