JP2009052194A - Deodorizing equipment for sewerage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide deodorizing equipment for sewerage, which prevents a valve section from being clogged with foreign matter such as sediment and refuse, which surely prevents a malodor from leaking from a gap of a lid section of accessory equipment for the sewerage, such as a manhole, and which can discharge the malodor by removing it. <P>SOLUTION: This deodorizing equipment comprises an equipment body 20 which is formed in an approximate funnel shape, an equipment mounting means 22 for demountably mounting the equipment body near an entrance section such as the manhole 11, and a flap valve 25 which is mounted on the leading-end opening surface of a drainage cylinder 24 on the lower-end side of the equipment body. The flap valve 25 comprises an arc-shaped magnet 27 for an outer drum, which is fixed to the outer periphery of the leading-end opening surface of the drainage cylinder, and an on-off valve body 3 which has a magnet 29 for a sheet provided on the backside and which is openably/closably mounted on the leading-end opening surface of the drainage cylinder. When rainwater and the like do not flow in, the on-off valve body 25 is closed by the magnetic attracting force of the magnets 27 and 29. When the rainwater and the like flow in, the on-off valve body 25 is opened by the weight of the rainwater. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is attached to the manhole connected to the sewer, the exhaust port for releasing the internal pressure in the sealed manhole, etc., near the entrance of sewerage accessories such as rainwater tanks, sewage tanks, etc. It is related with the odor prevention apparatus for sewer which prevented leaking outside from the cover part clearance gap.

  In the case of a combined sewer, bad odor generated in the sewer or bill pit may leak out from the air vent hole of the manhole cover and cause bad odor. Such a problem occurs not only in manholes, but also in exhaust holes for releasing internal pressure in sealed manholes, rainwater tanks and sewage tanks connected to sewers. In order to solve such problems, various devices have been proposed.

  For example, in Patent Document 1, a water collection port through which rainwater flows is formed in the top plate portion constituting the lid portion of the rainwater tank, and an arc shape in a side view for guiding the rainwater that has flowed into the back surface side of the water collection port. A sewer odor prevention device is shown in which a water collecting cylinder portion is attached and an on-off valve is provided at the drain outlet of the end face of the water collecting cylinder portion. The sewage odor prevention apparatus described in Patent Document 1 prevents a bad odor from leaking outside by closing the drain port portion of the end face of the water collecting cylinder with an on-off valve in a fine weather where rainwater does not flow. When rain falls and rainwater flows in, the on / off valve is opened by the flowing water pressure of the rainwater that has flowed in, and the rainwater is discharged into the cage.

  In Patent Document 2, a flanged ring is fitted to the entrance of a pipe tank connected to a sewage tank or a rainwater tank, and the flanged ring has a cylindrical shape made of a flexible material such as a soft synthetic resin sheet. One end of the deodorizing cylinder is fixed, and the other end of the flexible deodorizing cylinder is set as an open end, and the end wall of the open end is forcibly closed when there is no water passage. In addition, there is shown a malodor control apparatus equipped with a blocking member that releases the closed end of the deodorizing cylinder by flowing water pressure when water flows. In the malodor prevention device described in Patent Document 2, when rainwater or the like is not flowing in, the open end of the deodorizing cylinder is closed with a closing member so that the bad smell does not leak out and rainwater or the like flows in. If it is possible, the end of the deodorizing cylinder is released by the flowing water pressure of the rainwater or the like flowing in, and rainwater or the like is sent into the pipe.

  In Patent Document 3, a deodorizing box having a deodorizing chamber and an air valve is attached to the back side of a manhole cover, and a gas trap side of the deodorizing chamber is filled with a sealing trap and a humidity control agent. A wet part is provided, and an adsorption part formed by filling the hollow part of the multi-partition structure with an adsorbent is provided on the gas outlet side, and the air valve is provided at the gas outlet part or the gas inlet part of the deodorizing chamber. A deodorizing device is shown. The deodorizing apparatus described in Patent Document 3 is configured to deodorize and dehumidify the odor flowing out from the manhole through the deodorizing chamber, and then discharge it to the outside through an air valve.

Japanese Unexamined Patent Application Publication No. 2007-1000047 (all pages, all figures) Japanese Utility Model Publication No. 62-7489 (all pages, all figures) Japanese Patent No. 3035678 (all pages, all figures)

  However, in the case of the sewage odor prevention apparatus described in Patent Document 1, earth and sand or dust is likely to be clogged between the on-off valve and the casing, and the sealing performance of the on-off valve portion is impaired, and odor may leak from the gap. There is. In addition, in the case of the malodor prevention apparatus described in Patent Document 2, foreign substances such as earth and sand and dust are likely to be clogged at the open end of the deodorization cylinder made of a flexible material such as a soft synthetic resin sheet, and the bad smell may leak out. there were. Furthermore, in the case of the deodorizing apparatus described in Patent Document 3, there is a problem that odor leaks due to evaporation of the sealing water under hot weather, and further, the deodorizing performance decreases due to sediment accumulation in the lower part of the sealing water.

  The present invention was made to solve the above problems, and the valve portion is not clogged with earth and sand, dust, etc., and the bad smell generated in the sewer or the building pit is an exhaust port for releasing internal pressure in a manhole, a sealed manhole, Providing sewage odor prevention equipment that can reliably prevent leakage from the gap between the lids of sewerage accessories such as sewage and rainwater tanks, as well as deodorizing the odors inside the attachments and discharging them to the outside. It is intended to do.

In order to achieve the above object, the present invention employs the following means.
That is, the odor prevention device for sewer according to claim 1 is provided at a position close to the upper edge of the main body of the device main body having a substantially funnel shape as a whole, and the internal pressure release in the manhole, sealed manhole, etc. Device attachment means for detachably attaching near the entrance of sewerage accessories such as exhaust outlets, rainwater tanks, and sewage tanks, and the tip of a small drainage pipe on the lower end side of the substantially funnel-shaped apparatus body A flap valve attached to the opening surface so as to be openable and closable, the flap valve being openable and closable on the arc opening outer body magnet fixed to the outer periphery of the drain opening of the drain tube and the opening of the drain tube The on-off valve body is composed of a flexible sheet to which an arc-shaped sheet magnet having the same shape as the outer body magnet is fixed on the back side, Press the rewritable sheet against the top surface of the drain tube so that the sheet magnet on the back side overlaps the outer cylinder magnet on the drain tube side, and the surplus portion of the flexible sheet that protrudes from the periphery of the drain tube faces the drain tube side. The back half of the folded over surplus portion is fixed to the outer peripheral surface of the drain tube by the sheet fixing means in a watertight manner, and the front half side of the drain tube is By extending outward from the front end opening surface by a predetermined length, the left and right side edges rise to form a bowl-shaped on-off valve body. The on-off valve body is closed by a magnetic attraction force of a magnet, and when the rainwater flows in, the on-off valve body is opened by the weight of rainwater. That.

    The sewerage odor prevention apparatus according to claim 2 is the sewerage odor prevention apparatus according to claim 1, wherein a front end opening surface of the drain tube is a horizontal plane, and the on-off valve is predetermined in a horizontal direction along the horizontal plane. It is characterized by being extended in length.

  The sewerage odor prevention apparatus according to claim 3 is the sewerage odor prevention apparatus according to claim 1, wherein a front end opening surface of the drain tube is an inclined surface, and the on-off valve body is inclined along the inclined surface. A predetermined length is extended downward.

  The sewerage odor prevention apparatus according to claim 4 is the sewerage odor prevention apparatus according to any one of claims 1 to 3, wherein the sewage odor prevention apparatus is located in an appropriate position on the upper side of the substantially funnel-shaped apparatus body. A deodorizing device for deodorizing the odor and discharging it into the apparatus main body is provided.

  According to the sewage odor prevention apparatus of the present invention having the above-described configuration, when the rainwater does not flow into the front end opening surface of the drain tube on the lower end side of the substantially funnel-shaped main body, the on-off valve body is opened by a magnetic adsorption force. When the rainwater flows in, it has a flap valve that automatically opens the open / close valve body according to the weight of the rainwater that has flown in. It is possible to reliably prevent the odor from leaking to the outside, and when rainwater flows in, the rainwater that flows in by automatically opening the valve portion can be discharged into a manhole or the like.

  In addition, the on-off valve body has a bowl shape with the left and right side edges folded back upward, so that rainwater flows down so as to collect near the center of the on-off valve body, and the on-off valve body drains at the tip side. Since the rainwater starts to flow outward from the cylinder by a predetermined length, a downward moment force due to the rainwater flowing on the opening / closing valve body acts on the opening / closing valve body. Keep the open state stable until there is no inflow. For this reason, foreign matter such as earth and sand and dust flowing in together with rainwater can be surely discharged into the manhole and the like, and foreign matter such as earth and sand and dust does not clog the flap valve portion. Therefore, unlike the conventional case, the valve portion remains open due to clogging with earth or sand, and odor does not leak from the gap. In particular, when the tip opening surface of the drain tube is an inclined surface, and the on-off valve body extends obliquely downward along the inclined surface, rainwater is more likely to flow down, so that earth and sand and dirt are less likely to be clogged. The effect can be further ensured.

  Further, since a deodorizing device is provided in addition to the flap valve, it is possible to positively deodorize and exhaust the odor in the manhole and the like. For this reason, even if the odor pressure in the manhole is higher than the external pressure, the odor is discharged through the deodorizer and then discharged to the outside. Nothing will happen.

  Moreover, since the apparatus main body is made detachable by the apparatus attaching means, it can be easily attached to the existing sewerage accessories without any modification. Furthermore, since it can be easily removed during sewage inspection and the like, it does not get in the way during inspection or repair of sewage equipment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 9 show a first embodiment of a sewage odor prevention apparatus (hereinafter abbreviated as “odor prevention apparatus”) according to the present invention.

  This first embodiment shows an example when applied to a manhole. FIG. 1 is a schematic cross-sectional view of a state in which the odor prevention device is attached to the manhole. FIG. 2 is a plan view of the odor prevention device. 3 is a left side view of the odor prevention device, FIG. 4 is a front view of the odor prevention device, FIG. 5 is an enlarged cross-sectional view of the device mounting means, and FIG. 6 shows the structure of the flap valve portion provided at the tip of the drain tube. FIG. 7 is a diagram showing the structure of the tip of the drain tube, and FIG. 8 is a development view of the flexible sheet.

  In FIG. 1, 11 is a manhole housing, 12 is a manhole cover provided with an air vent hole 12a, 13 is an inspection step for getting into and out of the manhole, and 20 is an odor prevention apparatus of the present invention. As shown in the figure, the odor prevention apparatus 20 of the present invention is located near the entrance of the manhole housing 11 and is detachably attached to the inner wall surface of the manhole housing 11 by the device attachment means 22.

  As shown in FIG. 2 to FIG. 4, the odor prevention apparatus 20 of the present invention is composed of a device main body 21 having a substantially funnel shape as a whole. The apparatus main body 21 is made of, for example, a hard synthetic resin such as polypropylene, and has a size that enters the manhole housing 11 with a predetermined gap between the device body 21 and the inner wall surface of the manhole housing 11.

  On the peripheral wall near the upper end of the substantially funnel-shaped device body 21, device mounting means 22 for detachably mounting the device body 21 in the manhole housing 11 is provided, for example, at an interval of 120 degrees in the circumferential direction. There are three places. As shown in an enlarged view in FIG. 5, the device attachment means 22 includes an adjuster bolt 22b having a pad 22a made of an elastic body such as rubber or resin, metal, etc. attached to the tip, and fastening nuts 22c, 22d. It is composed of

  When attaching the apparatus main body 21 into the manhole housing 11, the elastic packing 23 made of rubber or the like is fitted between the manhole housing 11 and the adjuster bolts 22b at the three surrounding locations are pushed outward. What is necessary is just to press-contact the pad 22a of the front-end | tip to the inner wall face of the manhole housing 11. FIG. As a result, the apparatus main body 21 is fixed near the entrance of the manhole casing 11 and airtightness between the manhole casing 11 and the apparatus main body 21 is secured by the elastic packing 23.

  The apparatus body 21 having a substantially funnel shape has a cylindrical portion with a small diameter on the lower end side as a drain cylinder 24 for collecting rainwater or the like flowing from the air vent hole 12a of the manhole cover 12 and flowing it into the manhole. ing. A flap valve 25 that can be freely opened and closed is attached to the tip of the drain tube 24. The flap valve 25 is closed when rainwater or the like does not flow into the apparatus main body 21, and automatically opens depending on the weight of the rainwater that has flowed in when rainwater or the like flows.

The detailed structure of the flap valve 25 is shown in FIGS.
As shown in FIG. 7, a packing 26 for securing a sealing property is bonded and fixed to the front end surface of the drain tube 24 over the entire circumference. Further, an outer cylinder magnet 27 having an arc shape having a length of about 200 degrees in the circumferential direction is adhered and fixed flush with the packing 26 on the outer peripheral surface of the distal end portion of the drain tube 24 to which the packing 26 is attached. Has been. The packing 26 may be provided only on the contact surface portion with the flap valve 25 that opens and closes, or may be omitted when the sealing property can be secured by direct contact with the flap valve 25 that opens and closes. . Further, the length of the outer body magnet 27 in the circumferential direction is not limited to 200 degrees, and may be a length at which the opening / closing operation of the flap valve 25 described later is performed most reliably and stably.

  On the other hand, the flap valve 25 is comprised from the flexible sheet | seat 28 which has flexibility. As shown in a developed view of FIG. 8, the flexible sheet 28 is a rectangular sheet that is larger than the outer diameter of the drain tube 24 by a predetermined length. Examples of the material of the flexible sheet 28 include, for example, general-purpose plastics (PVC, PP, PS, PE, PET, etc.), metallized plastics, rubber plates, a material in which a magnetic material such as piano wire is embedded in these materials, Thin plates such as SPCC, spring steel, stainless steel, wood, coated paper, and shape memory alloy can be used.

  A sheet magnet 29 having the same size and the same shape as the outer cylinder magnet 27 attached to the drain tube 24 is bonded and fixed to the back surface side of the flexible sheet 28. By attaching the flexible sheet 28 to the opening surface of the front end of the drain tube 24 as follows, an openable / closable flap valve 25 is configured.

  That is, the flexible sheet 28 provided with the sheet magnet 29 on the back surface side is pressed against the front end surface of the drain tube so as to block the front end opening surface of the drain tube 24, and the back surface sheet magnet 29 is placed on the drain tube 24 side. The position of the outer body magnet 27 is adjusted so that the outer body magnet 27 and the outer body magnet 27 are exactly overlapped with each other. In this aligned state, the surplus portion 30 (the hatched portion in FIG. 8B) of the flexible sheet 28 that protrudes from the periphery of the drain tube 24 is folded back almost at right angles toward the drain tube 24 side. .

  Next, as shown in FIG. 6, the back half of the folded surplus portion where the sheet magnet 29 does not exist is drained by a sheet fixing means 31 such as an adhesive tape, a heat shrinkable tube or a rubber band. Crimped and fixed to the outer peripheral surface of the watertight. On the other hand, the front half portion of the flexible sheet 28 extends in the horizontal direction by a predetermined length L (see FIGS. 6B and 8B) from the horizontal front end opening surface of the drain tube 24, thereby Let the left and right side edges be a bowl-shaped on-off valve body 32 that rises substantially vertically.

  In the flap valve 25 configured as described above, when rainwater does not flow, as shown in FIGS. 6A to 6C, the seat magnet 29 and the outer body magnet 27 are attracted by the magnetic force. The end opening surface of the drain tube 24 is closed. For this reason, the odor in the manhole does not leak to the outside from the front end opening surface of the drain tube 24.

  On the other hand, when rainwater flows in and the weight of the rainwater that has flowed in becomes greater than the magnetic attractive force of the seat magnet 29 and the outer trunk magnet 27, the on-off valve body 32 is magnetized as shown in FIG. 29 is pushed downward with a base position P (see FIG. 6A) as a fulcrum, and drained rainwater is discharged into the manhole along the bowl-shaped on-off valve body 32.

  When the on-off valve body 32 is opened and drainage of rainwater begins, both side edges of the on-off valve body 32 are folded back into a bowl shape, so that rainwater flows down along the bowl-shaped on-off valve body 32. . For this reason, once rainwater begins to flow, a downward rotation moment due to the weight of the flowing rainwater acts on the on-off valve body 32, and the on-off valve body 32 that has been pushed open maintains its open state stably.

  When the inflow of rainwater ceases, the on-off valve body 32 is pulled upward by the restoring force of the flexible sheet 28 and the magnetic attractive force of the sheet magnet 29 and the outer body magnet 27, and again the drain cylinder 24. The front end opening surface is closed, and odor is automatically prevented from leaking from the front end opening surface of the drain tube 24 to the outside. In this way, the odor in the manhole is prevented from leaking outside.

  By the way, when the pressure of the odor in the manhole becomes higher than the external pressure, the possibility that the odor leaks out from a slight gap in the manhole cannot be denied. Therefore, in the present invention, in addition to prevention of odor leakage by the flap valve 25, a deodorizing device 33 (see FIG. 1) for positively deodorizing the odor in the manhole and discharging it to the outside is provided on the upper portion of the device main body 21. It is attached at an appropriate position on the side wall. The odor in the manhole, which is prevented from leaking to the outside by the flap valve 25, is deodorized through the deodorizing device 33 and then guided into the device main body 21 through the air vent hole 12a of the manhole cover 12. Released to the outside.

  The deodorizing device 33 may be of any type as long as it can deodorize the odor. Preferably, the deodorizing device previously proposed by the present applicant as Japanese Patent Application No. 2005-354485 is used. That's fine. The deodorizing apparatus according to this earlier application is capable of deodorizing odors without being affected by high humidity such as in a manhole, and a high-performance catalyst thin film is formed on a substrate having a honeycomb structure. Deodorizing efficiency is improved by bringing a high-performance catalyst and an odor component into contact with each other with high efficiency.

  Briefly explaining the structure of the deodorizing apparatus according to the previous application, as shown in FIG. 1, an acidic deodorizing filter 33b in which a thin-film high-performance catalyst is formed on a substrate having a honeycomb structure and a neutral deodorizing device. The filter 33c has a two-layer structure. First, the acidic deodorizing filter 33b removes odorous substances containing acidic components such as hydrogen sulfide and methylcaptan in the inflowing odor, and then neutralizes the deodorizing filter. By 33c, malodorous substances containing neutral components such as methyl sulfide and methyl disulfide are deodorized and removed. Depending on the type of odor generated, the neutral deodorizing filter 33c is not necessary, and there may be a case where a single-layer structure of only the acidic deodorizing filter 33b is possible. Further, it is desirable to provide a dustproof filter 33a on the odor airflow inlet side of the deodorizing device 33 in order to prevent clogging of the filters 33b and 33c.

  The odor prevention device 20 according to the above embodiment closes the valve portion when rainwater does not flow into the front end opening surface of the drain tube 24 on the lower end side of the device body 21 having a substantially funnel shape, and rainwater flows in. The flap valve 25 is provided to automatically open the valve section depending on the weight of rainwater that has flowed in. Therefore, the valve section is closed during rainy days when rainwater does not flow, and the odor in the manhole leaks to the outside. On the other hand, when rainwater flows in, it is possible to open the valve portion by the flowing rainwater and discharge the rainwater into the manhole.

  Further, since the on-off valve body 32 has a bowl shape with the left and right side edges folded back upward, rainwater flows down so as to gather near the center of the on-off valve body 32. Further, the open / close valve body 32 has a distal end extending from the drain tube 24 by a predetermined length L in the horizontal direction. For this reason, when the bowl-shaped on-off valve body 32 opens and rainwater begins to flow, a downward rotation moment due to rainwater flowing on the on-off valve body acts on the on-off valve body 32, and the on-off valve body 32 flows into the rainwater. It keeps the open state stable until it disappears. For this reason, foreign matter such as earth and sand or dust that has flowed together with rainwater is surely discharged into the manhole, and the flap valve 25 is not clogged. As a result, the valve portion is not closed due to clogging with earth and sand as in the conventional case, and odor does not leak out from the gap.

  Further, since the deodorizing device 33 is provided in addition to the flap valve 25, the odor in the manhole can be positively deodorized and exhausted. For this reason, even if the odor pressure in the manhole is higher than the external pressure, the odor discharged from the manhole is deodorized and discharged, so that the bad odor does not leak and drift.

  Furthermore, since the apparatus main body 21 is detachable by the apparatus attaching means 22, it can be easily attached to an existing manhole without requiring any modification. In addition, when an operator enters the manhole at the time of inspection of the sewerage system, it can be easily removed by loosening the device mounting means 22, so that it does not interfere with the inspection or repair of the sewerage system. .

In FIG. 9, 2nd Embodiment of the odor prevention apparatus which concerns on this invention is shown.
In the first embodiment, a case where an adhesive tape, a heat shrinkable tube, a rubber band or the like is used as the sheet fixing means 31 for watertightly fixing the flexible sheet 28 to the front end opening surface of the drain tube 24 is shown. However, this 2nd Embodiment is an example at the time of using the hose band 34 instead of these as the sheet | seat fixing means 31 instead. In addition, since the structure of parts other than this hose band 34 is the same as the said 1st Embodiment, the same code | symbol is attached | subjected to the same part and the detailed description is abbreviate | omitted.

FIG. 10 shows a third embodiment of the odor preventing apparatus according to the present invention.
In the third embodiment, in the same configuration as that of the first embodiment, the tip opening surface of the drain tube 24 is an inclined surface cut off obliquely, and the flap valve 25 is attached to the inclined opening surface. This is an example. Thus, when the tip of the drain tube 24 is an inclined opening surface, rainwater is more likely to flow down along the opening / closing valve body 32, so that foreign matter such as earth and sand and dust is less likely to be clogged. Can be.

  In the above embodiment, in order to reduce the weight of the device, the case where the device body 21 having a substantially funnel shape is made of a synthetic resin such as polypropylene is exemplified. However, the material of the device body 21 is limited to this. Instead, for example, when the weight does not matter, it may be made of stainless steel (SUS) or the like.

  As mentioned above, although the example at the time of applying the odor prevention apparatus of this invention to a manhole was explained in full detail, the application object of the odor prevention apparatus of this invention is not restricted only to a manhole, For example, other sewer attachment facilities, for example, sealing The present invention can also be applied to exhaust ports for releasing internal pressure, rainwater tanks, sewage tanks, etc. in manholes.

In FIG. 11, the example at the time of applying the odor prevention apparatus of this invention to a rainwater tank is shown.
When applied to the rainwater tank 40, the size of the odor prevention apparatus 20 of the present invention may be reduced according to the size of the rainwater tank 40. The attachment method to the rainwater basin 40 can be performed in the same manner as in the case of the manhole using the device attachment means 22.

  As in the case of the manhole, the odor prevention device 20 attached in the rainwater basin 40 closes the flap valve 25 when rainwater does not flow, and prevents leakage of odor in the basin. On the other hand, when rainwater flows in from the water collection port 41a of the rainwater lid 41, the flap valve 25 is opened according to the weight of rainwater, and the rainwater that has flowed in is fed into the trough as in the case of the manhole. 42 to the sewer. Further, the odor generated in the basket is deodorized by the deodorizer 33 and then discharged outside the basket.

In FIG. 12, the example at the time of applying the odor prevention apparatus of this invention to a sewage tank is shown.
When applied to the sewage basin 50, the size of the odor prevention apparatus 20 of the present invention may be reduced according to the size of the sewage basin 50. The attachment method to the sewage basin 50 can also be performed using the device attachment means 22 in the same manner as in the case of a manhole.

  As in the case of the manhole, the odor prevention device 20 attached in the sewage basin 50 closes the flap valve 25 to prevent leakage of odors in the tub when rainwater does not flow. When rainwater flows in from the air vent hole 52 a of the sewage jar cover 52, the flap valve 25 is opened and sent into the tub and discharged into the sewer through the pipe tub 53 as in the case of the manhole. Further, the odor generated in the basket is deodorized by the deodorizer 33 and then discharged outside the basket.

  In the above description, the shape of the main body of the device having a substantially funnel shape is a circular shape. However, in the manhole 11, an exhaust port for releasing internal pressure in a sealed manhole, etc., sewerage accessories such as a rainwater tank 40, a sewage tank 50 There are not only round shapes but also square shapes, polygonal shapes, and other irregular shapes. In such a case, the planar view shape of the device body 21 having a substantially funnel shape may be the same shape according to these shapes.

1 shows a first embodiment of a sewage odor prevention apparatus according to the present invention, and (a) is a schematic cross-sectional view when the sewage odor prevention apparatus of the present invention is applied to a manhole. It is a top view of the said odor prevention apparatus for sewers. It is a left view of the said odor prevention apparatus. It is a front view of the said odor prevention apparatus for sewers. It is an expanded sectional view of the part of an apparatus attachment means. The structure of the flap valve provided in the front-end | tip opening surface of a drain pipe is shown, (a) is a schematic perspective view, (b) is the side view, (c) is sectional drawing of the state which the on-off valve body closed (D) is sectional drawing of the state where the on-off valve body opened. The structure of the front-end | tip part of a drain pipe is shown, (a) is sectional drawing of a front-end | tip part, (b) is a bottom view of a front-end | tip part, (c) is a schematic perspective view of a front-end | tip part. The expanded view of the flexible sheet which comprises an on-off valve body is shown, (a) is a side view, (b) is a back view, (c) is the perspective view seen from the back side. The 2nd Embodiment of the odor prevention apparatus for sewers which concerns on this invention is shown, (a) is a schematic front view of a flap valve part, (b) is the right view. The 3rd Embodiment of the odor prevention apparatus for sewers which concerns on this invention is shown, (a) is a schematic front view of a flap valve part, (b) is the right view. It is a schematic sectional drawing which shows the example at the time of applying the odor prevention apparatus for sewers of this invention to a rainwater tank. It is a schematic sectional drawing which shows the example at the time of applying the odor prevention apparatus for sewers of this invention to a sewage tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Manhole housing | casing 20 Odor prevention apparatus for sewers 21 Apparatus main body 22 Apparatus attachment means 23 Elastic packing 24 Drain pipe 25 Flap valve 26 Packing 27 Outer trunk magnet 28 Flexible sheet 29 Sheet magnet 31 Sheet fixing means 32 Opening and closing valve body 33 Deodorizing apparatus 34 Hose band (sheet fixing means)
40 Rainwater tank 50 Sewage tank

Claims (4)

A device body with an overall funnel shape and a position close to the upper edge of the device body. The device body is attached to an exhaust port for releasing internal pressure in manholes, sealed manholes, and sewers such as rainwater tanks and sewage tanks. A device mounting means for detachably mounting near the entrance of the equipment, and a flap valve that is openably and closably attached to the front end opening surface of the drain tube with a small diameter on the lower end side of the substantially funnel-shaped device body. ,
The flap valve comprises an arc-shaped outer body magnet fixed to the outer periphery of the front end opening surface of the drain tube, and an on-off valve body attached to the front end opening surface of the drain tube so as to be openable and closable.
The on-off valve body is composed of a flexible sheet to which an arc-shaped sheet magnet having the same shape as the outer body magnet is fixed on the back side,
The flexible sheet is pressed against the tip of the drain tube so that the sheet magnet on the back side overlaps the outer cylinder magnet on the drain tube side, and the excess portion of the flexible sheet protruding from the periphery of the drain tube is placed on the drain tube side. The back half of the folded back surplus part, where the sheet magnet does not exist, is pressure-tightly fixed to the outer peripheral surface of the drainage tube by the sheet fixing means, and the front half side is the drainage tube. By extending outward from the front end opening surface by a predetermined length, a left and right side edge rises into a bowl-shaped on-off valve body,
When rain water or the like does not flow in, the on / off valve body is closed by the magnetic attractive force of the outer body magnet and the seat magnet, and when rain water or the like flows in, the on / off valve body is closed by the weight of rain water. Sewer odor control device characterized by being opened.   The odor prevention device for sewers according to claim 1, wherein a front end opening surface of the drainage pipe is a horizontal plane, and the on-off valve extends in a horizontal direction along the horizontal plane for a predetermined length.   The odor prevention device for a sewer according to claim 1, wherein a front end opening surface of the drain tube is an inclined surface, and the on-off valve body is extended obliquely downward along the inclined surface by a predetermined length. .   The deodorizing device for deodorizing the odor in the sewer accessory equipment and discharging it into the device main body is provided at an appropriate position on the upper side of the substantially funnel-shaped device main body. Deodorizing device for sewer as described.

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