JP5824346B2 - Air supply structure for valve operation of vacuum valve unit - Google Patents

Description

  The present invention relates to an air supply structure for operating a valve of a vacuum valve unit used in a vacuum sewer system.

  It has already been performed to use a vacuum sewer system instead of a natural flow sewer system. In this vacuum sewer system, sewage collected in a sewage basin is collected by suction using a vacuum valve that is opened and closed by a vacuum pressure every predetermined amount.

  And the above-mentioned vacuum valve has a valve drive part for driving opening and closing, and a valve control part for controlling this valve drive part. The valve drive unit and the valve control unit are configured to operate by vacuum pressure and air pressure, respectively. At this time, operating air is introduced into the valve drive unit and the valve control unit from the ground via a breather hose.

  However, as described above, the valve drive unit and the valve control unit of the vacuum valve introduce air for operation using the breather hose from the ground as described above, so that the air intake path is long and complicated. The problem is that the vacuum valve unit will not function at all if, for example, ground subsidence occurs due to a disaster and air cannot be introduced from the ground using a breather hose. There was.

  In view of this, a device has been developed in which an air tank is provided inside the sewage basin so that the air inside the sewage basin can be directly supplied to the valve drive unit and the valve control unit (for example, see Patent Document 1).

  In the case of the above-mentioned patent document 1, the lower surface of the air tank is open, and the float is directly inserted and arranged therein. When the level of sewage inside the sewage basin rises, the float inside the air tank is raised, and the valve portion provided between the upper surface of the float and the upper surface of the air tank is closed.

  In the air tank, an air intake hole is directly formed in the upper side surface. Further, a check valve communicating with the valve portion is attached outside the upper surface of the air tank.

Japanese Patent No. 3102891

  However, the air tank of Patent Document 1 has the following problems.

  That is, since the float was provided directly inside the air tank itself and the float inside the air tank was raised and lowered by raising the level of the sewage inside the sewage tank, the structural perfection was low. For this reason, there is a possibility that sewage inside the sewage basin may enter the valve drive unit or the valve control unit due to a failure or an operation error.

  For example, in order to ensure that the float can be raised and lowered inside the air tank, it is necessary to install the air tank accurately in the vertical direction and in a stable state. High accuracy is required.

  In addition, during maintenance, it is necessary to remove the entire air tank from the sewage tank or disassemble the check valve described above. It is difficult to restore the airtightness of the.

  In addition, a resin guide member that guides the raising and lowering of the float along the inner wall of the air tank is attached to the side surface of the float, but if the resin guide member is worn or damaged, the float The balance will be lost, and smooth elevating movement will not be obtained.

  A relatively large gap is formed between the side surface of the float and the air tank by the above-described guide member. This gap is sized so that the foreign object is easily caught. There is a risk of disappearing.

  In addition, a conical valve body constituting the valve portion is attached to the upper surface of the float. The valve body is made of a plastic material, and the apex angle of the valve body is relatively large. Since it is set, the contact between the valve body and the valve seat tends to be excessive, and the sealing performance of the valve portion may be deteriorated due to deformation or wear of the valve seat.

  Furthermore, since the ballast material provided inside the float is made of a granular material or the like, the float is liable to be adversely affected due to fluctuations in weight or deviation.

In order to solve the above-mentioned problem, the invention described in claim 1 includes a sewage tank capable of storing sewage, and a vacuum valve connected to a sewage suction pipe capable of sucking sewage inside the sewage tank so as to be opened and closed A valve operating air supply structure of a vacuum valve unit having an air inlet capable of introducing valve operating air, wherein the vacuum valve is hermetically sealed and connected to the air inlet. A container-like air tank is provided in an independent state with respect to the ground, and an air intake pipe capable of taking air inside the sewage tank is provided in the air tank. A sewage intrusion prevention mechanism capable of preventing infiltration of sewage into the air tank is provided , and the air tank is provided above a partition plate provided to partition the interior of the sewage basin in the vertical direction, and the air intake The air intake of the pipe is at a position above the partition plate Characterized in that provided downward.

  The invention described in claim 2 is the liquid level in which the sewage intrusion prevention mechanism provided in the air intake pipe closes the air intake pipe by utilizing the rise of the sewage liquid level inside the sewage tank. It is characterized by comprising an actuated valve mechanism.

  The invention described in claim 3 is the above, wherein the liquid level actuated valve mechanism includes a valve part that can be opened and closed, and a float member that opens and closes the valve part using a change in the liquid level of sewage, The valve portion includes a valve seat having an air hole penetrating in the vertical direction, and a valve body disposed below the valve seat so as to be movable up and down by the float member, and the valve body includes the air hole. It has a thin conical portion that can be closed from the lower side.

  The invention described in claim 4 is characterized in that, in the above, the valve body has a guide rod that can be inserted into the air hole of the valve seat at the top thereof.

  The invention described in claim 5 is characterized in that, in the above, an insect repellent member capable of preventing insects from entering is provided inside the air intake tube.

  The invention described in claim 6 is characterized in that, in the above, the air intake pipe is directly attached to an upper side surface of the air tank.

  The invention described in claim 7 is the above, wherein the air intake pipe is provided separately from the air tank, and the air intake pipe and the air tank are connected via a flexible hose. It is characterized by.

The invention described in claim 8 is characterized in that, in the above, the liquid level actuated valve mechanism is provided outside the air tank, and a water drain hole is provided in the air tank .

According to invention of Claim 1, the following effects can be acquired by the said structure. In other words, an air intake pipe is connected to an air tank in an airtight container that is independent of the ground, and a sewage intrusion prevention mechanism that can prevent infiltration of sewage inside the sewage basin is provided for this air intake pipe Therefore, when using the air inside the sewage basin as the valve operating air, even if the inside of the sewage basin is submerged by sewage, etc., it is essential to prevent the sewage from entering the control valve. It is possible to meet performance requirements.
Further, by providing the air tank above the partition plate, the air tank can be protected from the sewage until the inside of the sewage basin is almost full of sewage. In addition, by providing the air intake port of the air intake pipe above the partition plate and facing downward, the air tank will continue to function until the inside of the sewage basin is almost full of sewage. In addition, when the interior of the sewage basin is almost full of sewage, it is most convenient because the air tank can be securely closed and the vacuum valve can be protected from the entry of sewage.

  According to invention of Claim 2, the following effects can be acquired by the said structure. That is, the liquid level actuated valve mechanism that constitutes the sewage intrusion prevention mechanism functions to close the air intake pipe by utilizing the rise of the sewage liquid level inside the sewage tub. Thereby, even if there is no special drive source, a liquid level actuated valve mechanism functions automatically according to the change in the level of sewage inside the sewage basin.

  According to invention of Claim 3, the following effects can be acquired by the said structure. That is, by making the valve body into a thin conical section, the air hole is reliably and highly sealed when the valve is closed and closed from the lower side, and the valve body is easily lowered from the valve seat when the valve is opened. It becomes possible to leave.

  According to invention of Claim 4, the following effects can be acquired by the said structure. That is, the valve body has a guide rod that can be inserted into the air hole of the valve seat at the top thereof, so that the cone portion is reliably guided to the air hole, and the air hole is clogged by foreign matter, insects, etc. by the guide rod. Can be removed.

  According to the fifth aspect of the present invention, the following operational effects can be obtained by the above configuration. In other words, by providing an insect repellent member that can prevent the invasion of insects inside the air intake pipe, the invasion of insects into the air tank and the air intake pipe, and the valve part due to the invasion of insects It becomes possible to prevent clogging and the like.

  According to invention of Claim 6, the following effects can be acquired by the said structure. In other words, since the air intake pipe is directly attached to the upper side surface of the air tank, the air intake pipe can be handled integrally with the air tank, and the construction is facilitated accordingly. And when installing an air tank, since it becomes possible to adjust direction in two places, an air tank and an air intake pipe, it is air so that a liquid level actuated valve mechanism may operate | move reliably. It becomes easy to install the intake pipe with high accuracy in the vertical direction.

  According to invention of Claim 7, the following effects can be acquired by the said structure. That is, the air intake pipe is provided separately from the air tank, and the air intake pipe and the air tank are connected via a flexible hose. It becomes possible to install each in the optimal position separately.

According to invention of Claim 8, the following effects can be acquired by the said structure. In other words, the liquid level actuated valve mechanism is provided outside the air tank, and the water tank is provided with a water drain hole, so that the liquid level actuated valve mechanism and the water tank drain hole can function separately. .

It is sectional drawing which looked at the vacuum valve unit concerning the Example of this invention from the side. It is sectional drawing which looked at the vacuum valve unit of FIG. 1 from upper direction. It is a side view which shows the air supply structure for valve operation of FIG. FIG. 4 is a partially enlarged view of FIG. 3. It is the elements on larger scale of the valve part of FIG. 4, (a) shows a valve opening state, (b) shows a valve closing state. It is an enlarged view of the valve body of FIG. It is a top view of the guide plate of FIG. It is a figure which shows the modification of FIG. It is a figure which shows another modification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings.

  1 to 9 show this embodiment and its modifications.

  <Configuration> The configuration will be described below.

  It has already been performed to use a vacuum sewer system instead of a natural flow sewer system. In this vacuum sewer system, sewage collected in a sewage basin is collected by suction using a vacuum valve that is opened and closed by a vacuum pressure every predetermined amount.

  1 and 2 are a side sectional view and a plan sectional view of a vacuum valve unit 1 constituting the main part of the vacuum sewer system described above.

  In this vacuum sewer system, sewage discharged from a building or the like is sent to the vacuum valve unit 1 under natural flow through a sewage inflow pipe (not shown) and temporarily stored in the vacuum valve unit 1.

  When the sewage in the vacuum valve unit 1 reaches a certain amount, the sewage is sucked into the vacuum sewage pipe 2 connected to the vacuum valve unit 1 by the vacuum pressure, and the downstream vacuum station (not shown) is passed through the vacuum sewage pipe 2. To the water collection tank.

  At this time, ground air (sewage suction air) can be introduced into the vacuum valve unit 1 through a vent pipe (not shown). Air is sucked in order (gas-liquid separation suction method).

  Then, the sucked sewage is conveyed to the above-described water collection tank as a gas-liquid mixed flow using the pressure difference between the vacuum pressure in front of the sewage and the suction air pressure behind the sewage.

  The vacuum valve unit 1 described above includes a sewage tub 4 for temporarily storing sewage from the sewage inflow pipe described above. The sewage basin 4 has a sewage basin body 4a embedded in the ground, and a lid 4b that is detachably attached to the upper end opening of the sewage basin body 4a. The sewage inside the sewage tub 4 is sucked into the vacuum sewage pipe 2 described above via the sewage suction pipe 5. A vacuum valve 6 that can be opened and closed by a vacuum pressure is provided between the sewage suction pipe 5 and the vacuum sewage pipe 2. A partition valve 7 is provided between the vacuum valve 6 and the vacuum sewage pipe 2 as needed to partition the vacuum valve 6 and the vacuum sewage pipe 2 during maintenance of the vacuum valve 6 and the like.

  The vacuum valve 6 described above has a valve drive unit 8 for driving opening and closing, and a valve control unit 9 for controlling the valve drive unit 8. The valve drive unit 8 and the valve control unit 9 are configured to operate by vacuum pressure and air pressure, respectively. That is, the valve drive unit 8 is, for example, a cylinder mechanism that operates using air pressure and vacuum pressure. The valve control unit 9 is, for example, a control valve that supplies and discharges operating air pressure and vacuum pressure to the cylinder mechanism using control air pressure and vacuum pressure. The valve drive unit 8 and the valve control unit 9 have air introduction ports 8a and 8b and vacuum pressure introduction ports 9a and 9b, respectively. The valve drive unit 8 is attached to a connecting pipe 6a having a short tubular shape for connecting the sewage suction pipe 5 and the vacuum sewage pipe 2 (or the gate valve 7). Is attached to the valve drive unit 8.

  In addition, a water level detection tube 11 capable of detecting the level of sewage is provided inside the sewage basin 4. The water level detection tube 11 is connected to the valve control unit 9 of the vacuum valve 6. Furthermore, a bypass pipe 12 is attached to the vacuum valve unit 1 to force the sewage inside the sewage tank 4 to be sucked into the vacuum sewage pipe 2 in the event of a failure, if necessary. In this case, the bypass pipe 12 is branched from the gate valve 7, but may be branched from the vacuum sewage pipe 2. In the middle of the bypass pipe 12, an on-off valve 12a for opening and closing the bypass pipe 12 is provided. The bypass pipe 12 has an upward detour shape, and the on-off valve 12 a is attached to the top of the bypass pipe 12.

  Furthermore, the vacuum valve unit 1 is provided with an accumulator 13 (accumulator) capable of accumulating vacuum pressure. The accumulator 13 has a capacity capable of accumulating a vacuum pressure of one or two times. For example, the accumulator 13 is provided in the middle of a vacuum path connecting the above-described bypass pipe 12 and the vacuum pressure inlets 9a and 9b of the valve drive unit 8 and the valve control unit 9.

  Moreover, a substantially horizontal partition plate 14 is provided in the middle of the sewage tank 4 in the vertical direction. The partition plate 14 is provided with an opening through which at least a part of a human body can be put, and an openable / closable inner lid 14a (see FIG. 2) is attached to the opening. The vacuum valve 6 and the gate valve 7 described above are installed in the space above the partition plate 14. The accumulator 13 is attached to the upper surface of the partition plate 14 and the like.

  Although the structure of the vacuum valve unit 1 other than the above is omitted, it is needless to say that the vacuum valve unit 1 has a necessary structure.

  In contrast to the basic configuration as described above, the present embodiment is provided with the following valve operating air supply structure.

(Configuration 1)
As shown in FIGS. 3 and 4, a sealed container-like air tank 21 connected to the air inlets 8 a and 8 b is provided in the sewage basin 4 in an independent state with respect to the ground . And the air intake pipe 22 which can take in the air inside the sewage tank 4 to this air tank 21 is provided. Further, the air intake pipe 22 is provided with a sewage intrusion prevention mechanism 23 capable of preventing the sewage inside the sewage tank 4 from entering the air tank 21.

  Here, the details will be described. The air intake pipe 22 and the sewage intrusion prevention mechanism 23 described above are provided separately from the air tank 21 and are installed outside the air tank 21. The air intake pipe 22 has a smaller diameter than the air tank 21. The details of the air intake pipe 22 and the sewage intrusion prevention mechanism 23 will be described later.

  In this case, the above-described airtight container-like air tank 21 (sealed air tank) is a short tubular body whose axis is directed in the vertical direction. However, the shape of the air tank 21 is not limited to this.

  The air tank 21 is provided with air supply ports 21a and 21b that can be connected to the air introduction ports 8a and 8b of the valve drive unit 8 and the valve control unit 9 described above. The air introduction ports 8a and 8b and the air supply ports 21a and 21b are connected by hoses (not shown), respectively. The air supply ports 21a and 21b may be unified so that the air supply ports 21a and 21b are connected by a branch hose.

  Further, the air tank 21 is formed with a drain hole 21c in a lower part or the like as required. A check valve (not shown) that can discharge liquid such as water and sewage is attached to the drain hole 21c only in one direction from the inside of the air tank 21 to the outside.

(Configuration 2)
And the sewage intrusion prevention mechanism 23 provided in the said air intake pipe 22 is comprised by the liquid level operation type valve mechanism 26 which closes the air intake pipe 22 using the raise of the liquid level of the sewage inside the sewage tank 4. Is done.

  Here, the liquid level actuated valve mechanism 26 has a normally open valve that is normally kept in an open state. This liquid level actuated valve mechanism 26 is reliably closed as the level of sewage inside the sewage basin 4 rises, and on the contrary, when the level of sewage inside the sewage basin 4 is lowered, it is surely again. It is supposed to open.

(Configuration 3)
More specifically, the above-described liquid level actuated valve mechanism 26 includes a valve part 31 that can be opened and closed, and a float member 32 that opens and closes the valve part 31 by utilizing a change in the liquid level of sewage. Is done.

  As shown in FIGS. 5 and 6, the valve portion 31 described above can be moved up and down by a valve seat 34 having an air hole 33 penetrating in the vertical direction and the float member 32 below the valve seat 34. The valve body 35 is provided.

  Further, the valve body 35 has an upper conical portion 36 that can close the air hole 33 from below.

  Here, the details will be described. The valve portion 31 described above is normally opened as described in the configuration 2.

  Further, as shown in FIG. 4, the above-described float member 32 is a liquid level detecting member that can move up and down by buoyancy due to a change in the level of sewage inside the sewage tub 4. As the float member 32, a ball-shaped member (ball tap) made of a resin material such as a PE material having chemical resistance, corrosion resistance, impact resistance, or the like is used. The float member 32 has a spherical shape or a flattened spherical shape.

  This float member 32 is installed on the outer side (lower side) of the above-described air intake pipe 22 (external float member). And in order to install the float member 32 on the outer side (lower side) of the air intake pipe 22, a rod-shaped valve rod 37 extending in the vertical direction is provided inside (the axial center position) of the air intake pipe 22. The float member 32 is detachably attached to the lower end portion of the valve rod 37 by screwing or the like (screw fixing portion 38).

  And the above-mentioned valve body 35 is provided in the upper end part of the valve rod 37 extended in an up-down direction. The valve body 35 may be formed integrally with the valve rod 37, or may be provided separately so as to be detachable and replaceable by screwing or the like. Between the upper end portion of the valve rod 37 and the valve body 35, a flange portion 37a that separates both is provided.

  In addition, a guide plate 39 (guide member) as shown in FIG. 7 can be provided inside the air intake pipe 22 as needed in order to guide the raising and lowering of the valve rod 37. In this case, the valve rod 37 has a diameter sufficiently smaller than that of the air intake pipe 22 and is loosely inserted into the guide plate 39 at the axial center position with a slight gap. Possible guide holes 39a are formed. The guide plate 39 is provided in the air intake tube 22 at one location or two or more locations separated vertically. The guide plate 39 is a disk-shaped member having an outer diameter substantially equal to the inner diameter of the installation portion with respect to the air intake tube 22.

  As shown in FIG. 4, a spacer 40 having a thickness capable of adjusting the stroke of the valve body 35 when the valve portion 31 opens and closes is provided inside the air intake pipe 22 as necessary. it can. The spacer 40 is formed with a hole at its axial center where the valve rod 37 can be loosely inserted with a slight gap. The spacer 40 is a disk-shaped member having an outer diameter substantially equal to the inner diameter of the installation portion with respect to the air intake tube 22. The spacer 40 can have the same structure as the guide plate 39 except for the thickness. Alternatively, the spacer 40 can be ring-shaped.

  Further, as shown in FIG. 5, in the above-described valve portion 31, the valve body 35 has a corrosion resistance in order to enhance the sealing performance between the valve body 35 and the valve seat 34 and to improve the certainty of detachment. It is comprised with metal materials, such as a SUS material. The valve seat 34 is made of a rubber material such as EPDM.

  The valve seat 34 is configured so that the hole diameter of the air hole 33 is the minimum necessary size, and the valve body 35 can be reliably closed with a small stroke. For example, the diameter of the air hole 33 of the valve seat 34 is 2Φ, and the length L1 (or height) of the conical part 36 of the valve body 35 is about 10 mm as shown in FIG. Then, the apex angle α of the cone portion 36 is set in the range of 25 degrees to 30 degrees. In this case, the apex angle α is set to 28 degrees. This is because when the apex angle is smaller than 25 degrees, the sealing performance is not improved for the amount of insertion (stroke) of the valve element 35 into the valve seat 34, but the apex angle is larger than 30 degrees. Then, the amount of deformation that the valve body 35 gives to the valve seat 34 increases, or the contact area between both increases, and the sealing performance decreases, or the valve body 35 bites into the valve seat 34 and separates from the valve seat 34. It becomes difficult to do.

  Further, as shown in FIG. 4, the above-mentioned float member 32 is provided with a valve seat of the valve body 35 in order to ensure that the float member 32 can be opened by lowering the level of the sewage inside the sewage tub 4. In order to improve the certainty of detachment from 34, a detachment assisting weight 41 is attached. The weight 41 has this suction force even when the valve portion 31 is sucked in the closing direction by the vacuum pressure due to the vacuum pressure for operating the vacuum valve 6 acting on the air tank 21. It shall have a weight capable of forcibly opening the valve against this. The weight 41 is detachably attached so that it can be set and adjusted to an optimum weight. The weight 41 is made of a solid metal such as a SUS material that has corrosion resistance and does not cause weight fluctuation or deviation (metal weight or solid (metal) weight).

  The weight 41 is, for example, an intermediate portion of the above-described valve rod 37 in a state where (at least a part of) the weight 41 is inserted into the air intake tube 22 or a state where the weight 41 is exposed outside the air intake tube 22. Or it shall be externally installed with respect to a lower end part. Therefore, an insertion hole for inserting the valve rod 37 is formed in the weight 41. When the air intake pipe 22 is inserted (at least partly), the weight 41 (at least the portion inserted into the air intake pipe 22) is more than the air intake pipe 22 (the inner diameter of the air intake pipe 22). A small-diameter thick-walled tube is used. A ventilation gap is formed between the air intake pipe 22 and the weight 41. The portion of the weight 41 inserted into the air intake tube 22 can be used as a guide member for guiding the valve rod 37 to rise and fall. When the weight 41 is used as a guide member, the above-described guide plate 39 can be omitted.

  Alternatively, the weight 41 described above can be attached to the lower end of the float member 32, although not particularly shown. In addition, by the above, the float member 32 shall have a volume which can generate | occur | produce the buoyancy for the above-mentioned weight 41.

(Configuration 4)
As shown in FIGS. 5 and 6, the above-described valve body 35 has a guide rod 43 that can be inserted into the air hole 33 of the valve seat 34 at the top thereof.

  Here, the guide rod 43 prevents the clogging of foreign matter into the air hole 33 of the valve seat 34 and the guide function for guiding the conical portion 36 of the valve body 35 with respect to the air hole 33 of the valve seat 34. Therefore, it has a blocking prevention function. For this purpose, the guide rod 43 extends in the vertical direction and has a needle shape that is thinner than the air hole 33 of the valve seat 34. The guide rod 43 has a length L2 that can be always inserted into the air hole 33. That is, the stroke is sufficiently longer than the stroke of the valve body 35. For example, as described above, when the hole diameter of the valve seat 34 is 2Φ and the length L1 of the cone portion 36 is about 10 mm, the guide rod 43 has a diameter of 1Φ and a length of about 22 mm. The However, the size of the guide bar 43 is not limited to this.

(Configuration 5)
As shown in FIGS. 4 and 7, an insect repellent member 45 capable of preventing insects from entering is provided inside the air intake tube 22.

  Here, the insects include organisms such as worms that can enter the inside of the sewage tub 4 and organisms that can inhabit the inside of the sewage tub 4. The insect repellent member 45 is an insect repellent net or an insect repellent plate. Of these, the insect net is a net having literally large eyes through which insects cannot pass. The insect-proof plate is a plate-like member having at least one small hole 45a having a size through which insects cannot pass. This insect repellent plate can be constituted by the above-described guide plate 39, the spacer 40, or the like, or can be constituted separately.

  Instead of the insect repellent member 45, a filter member or the like that can widely prevent foreign substances from entering or insects from entering may be provided.

(Configuration 6)
Then, as shown in FIGS. 3 and 4, the above-described air intake pipe 22 is directly attached to the upper side surface of the air tank 21.

  Here, the detailed structure of the air intake pipe 22 will be described. First, the air intake tube 22 shown in the figure includes a laterally extending portion 22a that extends in the lateral direction, a downwardly extending portion 22b that extends downward from the tip of the laterally extending portion 22a, a laterally extending portion 22a, and a downwardly extending portion 22b. And a bent portion 22c provided at the boundary portion.

  The air intake pipe 22 is constituted by resin pipe parts such as a horizontal pipe member 47, an elbow member 48, an upper vertical pipe member 49, a union joint 51, and a lower vertical pipe member 52 in order from the top. For these components, members made of vinyl chloride resin that can obtain high airtightness are used. Of these, the laterally extending portion 22a is mainly constituted by the horizontal tube member 47, the bent portion 22c is mainly constituted by the elbow member 48, and the downward extension portion 22b is mainly constituted by the upper vertical tube member 49, the union joint 51, and the lower portion. It is comprised by the vertical pipe member 52. FIG. In this case, the air inlet 22 d of the air intake pipe 22 is provided at the lower end of the lower vertical pipe member 52. Necessary air permeability is ensured inside the air intake pipe 22.

  Among these, the horizontal tube member 47 described above is a short constituting an overhanging portion (lateral overhanging portion 22a) for attaching the air intake tube 22 to the connection port 21d provided on the upper side surface of the air tank 21. It is a pipe member. The elbow member 48 described above has an L-shape for connecting the horizontal tube member 47 and the upper vertical tube member 49 and changing the direction of the air intake tube 22 from the horizontal direction to the downward direction. It is a pipe joint member, and has two opening portions at both ends of which can be bonded and fixed by inserting the distal end portion of the horizontal tube member 47 and the upper end portion of the upper vertical tube member 49, respectively. The upper vertical tube member 49 and the lower vertical tube member 52 described above are tube members for securing an air intake passage portion having a required length extending in the vertical direction. Further, the above-described union joint 51 is provided with the valve portion 31 between the upper vertical tube member 49 and the lower vertical tube member 52, and only the periphery of the valve portion 31 can be disassembled and assembled during maintenance. It is a pipe connection member interposed as a member for valve installation.

  The union joint 51 mainly includes an upper receiving member 54, a lower receiving member 55, and a connecting ring 56. Of these, the upper receiving member 54 described above has a receiving portion 54a that can be bonded and fixed by inserting the lower end portion of the upper vertical tube member 49 into the upper end portion thereof. The lower receiving member 55 has a receiving portion 55a that can be bonded and fixed by inserting the upper end portion of the lower vertical tube member 52 into the lower end portion thereof. The connection ring 56 is freely loosely fitted to the outer periphery of the upper receiving member 54 and is connected to a flange portion 54b (see FIG. 5) formed to protrude from the outer periphery of the lower end portion of the upper receiving member 54. On the other hand, a ring-shaped member having a locking portion 56a that can be locked in the vertical direction is provided on the inner periphery of the upper end. A female screw portion 56 b that can be screwed into a male screw portion 55 b formed on the outer peripheral portion of the lower receiving member 55 is formed on the inner peripheral portion of the connection ring 56.

  The valve seat 34 of the valve portion 31 described above is installed at a portion between the upper receiving member 54 and the lower receiving member 55. In this case, the valve seat 34 has a disk shape having an air hole 33 at the center, and is disposed in contact with the lower end surface 54 c of the upper receiving member 54. A hole 54d having the same diameter as or slightly larger than the air hole 33 of the valve seat 34 is formed in the lower end surface 54c of the upper receiving member 54 at the center.

  Further, the guide plate 39, the spacer 40, the insect repellent member 45, and the like described above are installed between the lower receiving member 55 and the upper end portion of the lower vertical tube member 52, and the like.

  In the case of this figure, the above-described weight 41 is accommodated and disposed entirely within the lower vertical tube member 52.

  Moreover, as shown in FIG. 8, as a modification example, the air intake pipe 22 is extended between the upper vertical pipe member 49 and the lower vertical pipe member 52, or the diameter of the air intake pipe 22 is increased. One or a plurality of intermediate longitudinal tube members 57 may be interposed for the purpose of changing the above. The middle vertical pipe member 57 has an upper end connected to the upper vertical pipe member 49 via a union joint 58 different from the above, and a lower end connected to the lower vertical pipe member 52 via the union joint 58. It is designed to be connected.

  Further, the intermediate vertical tube member 57 has a socket member 59 having a different diameter at the intermediate portion, and connects the upper small diameter tube portion 57a and the lower large diameter tube portion 57b so that the upper and lower tube diameters are different. It is assumed that. Accordingly, the upper vertical tube member 49 has a relatively small diameter, and the lower vertical tube member 52 has a relatively large diameter. However, the middle vertical tube member 57 may have a uniform vertical diameter.

  In addition, since the multi-stage union joint 51 and the union joint 58 are provided up and down, the above-described insect-proof member 45 may be provided for at least one of the union joint 51 and the union joint 58.

  A cap-shaped tube member 60 having the above-described guide plate 39 inside is attached to the lower end portion of the lower vertical tube member 52. Although not particularly illustrated, the above-described weight 41 is not particularly illustrated, but is attached to the outer periphery of a portion of the valve rod 37 protruding downward from the tube member 60.

(Configuration 7)
Alternatively, as shown in FIG. 9, the air intake pipe 22 described above is provided separately from the air tank 21 (separated air intake pipe). The air intake pipe 22 and the air tank 21 are connected via a flexible hose 61.

  The air intake tube 22 can be attached to the upper end portion of the downward extension portion 22b instead of including the laterally extending portion 22a and the bent portion 22c as shown in FIG. The hose attachment port member 62 is attached. Accordingly, a hose attachment port member 63 to which the hose 61 can be attached is attached to the connection port 21d on the upper side surface of the air tank 21. A hose 61 that indirectly connects the air intake pipe 22 and the air tank 21 has a smaller diameter than the air intake pipe 22. As such a hose 61, for example, a silicon hose can be used. The hose 61 includes a smaller diameter such as a tube. The configuration other than the above is substantially the same as that described above.

(Configuration 8)
The arrangement of the air tank 21 and the air intake pipe 22 is arbitrary, but preferably the air tank 21 described above is provided so as to partition the inside of the sewage basin 4 in the vertical direction as shown in FIG. It is provided above the partition plate 14. Then, as shown in FIG. 3, the air intake port 22 d of the air intake tube 22 is provided above the partition plate 14. Alternatively, as shown in FIG. 9, the air intake port 22 d of the air intake pipe 22 is provided below the partition plate 14.

  Here, the air tank 21 is preferably installed on the upper side of the accumulator 13 or the upper part of the sewage tank 4.

  Moreover, the air intake pipe 22 can also be provided so that the partition plate 14 may be penetrated up and down.

  <Operation> The operation of this embodiment will be described below.

  The sewage stored in the sewage tank 4 is sucked from the sewage suction pipe 5 by opening and closing the vacuum valve 6. The vacuum valve 6 is operated using valve operating air introduced from the air introduction ports 8a and 8b.

  And the air tank 21 of the airtight container shape is provided in the inside of the sewage basin 4, and the sewage basin 4 is provided by providing the air intake pipe 22 which can take in the air inside the sewage basin 4 with respect to this air tank 21. It is possible to eliminate the need to constantly take in the air for operating the valve from the outside. Thereby, the introduction system of the air for valve operation can be simplified. Further, since the air tank 21 described above can be additionally installed later with respect to the existing vacuum valve unit 1, the function of the vacuum valve unit 1 is improved or the vacuum valve unit 1 is modified to a different system. It is possible to easily cope with such cases. Further, even when air from the ground cannot be introduced due to ground subsidence or the like at the time of a disaster, the vacuum valve unit 1 can continue to function using the air inside the sewage tank 4. .

  <Effect> According to this embodiment, the following effects can be obtained.

(Operation effect 1)
An air intake pipe 22 is connected to an air tank 21 in the form of a closed container independent of the ground, and a sewage intrusion prevention mechanism capable of preventing infiltration of sewage inside the sewage tank 4 into the air intake pipe 22. By providing 23, the installation accuracy required for the installation of the air tank 21 can be lowered.

  Further, only the air intake pipe 22 is removed for maintenance, and the air intake pipe 22 can be easily re-installed after the maintenance.

  Furthermore, by providing the sewage intrusion prevention mechanism 23 for the air intake pipe 22 having a smaller diameter than that of the air tank 21, the structure of the sewage intrusion prevention mechanism 23 is simplified, and the sewage intrusion prevention mechanism 23 can be It becomes easy to make a structure in which problems such as pinching are unlikely to occur.

  Therefore, the optimization of the structure and the certainty of the operation can be obtained, and when the air inside the sewage basin 4 is used as the valve operating air, even if the inside of the sewage basin 4 is submerged by sewage or the like, It is possible to satisfy basic performance requirements for preventing sewage from entering the control valve.

(Operation effect 2)
The liquid level actuated valve mechanism 26 constituting the sewage intrusion prevention mechanism 23 functions to close the air intake pipe 22 by utilizing the rise of the sewage liquid level inside the sewage tank 4. Thereby, even if there is no special drive source, the liquid level actuated valve mechanism 26 automatically functions by changing the liquid level of the sewage inside the sewage tank 4.

(Operation effect 3)
By making the valve body 35 into a thin conical portion 36, the air hole 33 is reliably and highly sealed when the valve is closed, and is closed from the lower side, and easily opened from the valve seat 34 when the valve is opened. 35 can be detached downward.

  In particular, the sealing performance between the valve body 35 and the valve seat 34 is achieved by optimizing the material to be used, for example, the valve body 35 is made of SUS material having corrosion resistance and the valve seat 34 is made of rubber material such as EPDM. And improvement of the certainty of separation can be obtained.

  In addition, the apex angle of the cone part 36 is set within the range of 25 to 30 degrees, and preferably the apex angle is set to 28 degrees. Can be closed.

  Furthermore, by configuring the weight 41 attached to the valve body 35 with a metal solid such as a SUS material having corrosion resistance, it is possible to suppress fluctuations in weight and deviation.

(Operation effect 4)
Since the valve body 35 has the guide rod 43 that can be inserted into the air hole 33 of the valve seat 34 at the top, the cone body portion 36 is surely guided to the air hole 33, and foreign matter, insects, etc. are guided by the guide rod 43. The clogging of the air hole 33 due to the above can be removed.

(Operation effect 5)
By providing the insect repellent member 45 that can prevent the invasion of insects inside the air intake pipe 22, the invasion of insects into the air tank 21 and the air intake pipe 22 and the valve due to the invasion of insects It is possible to prevent clogging of the portion 31 and the like.

(Operation effect 6)
Since the air intake pipe 22 is directly attached to the upper side surface of the air tank 21, the air intake pipe 22 can be handled integrally with the air tank 21, and the construction is facilitated accordingly. .

  And when installing the air tank 21, since it becomes possible to adjust direction in two places, the air tank 21 and the air intake pipe 22, the liquid level actuated valve mechanism 26 is operated reliably. Thus, it becomes easy to install the air intake pipe 22 with high accuracy in the vertical direction.

(Operation effect 7)
The air intake pipe 22 is provided separately from the air tank 21, and the air intake pipe 22 and the air tank 21 are connected via a flexible hose 61. The tanks 21 can be separately installed at optimal positions.

(Operation effect 8)
By providing the air tank 21 above the partition plate, the air tank 21 can be protected from the sewage until the inside of the sewage basin is almost full of sewage.

  Further, by providing the air intake port 22d of the air intake pipe 22 above the partition plate 14, the air tank 21 can continue to function until the inside of the sewage basin 4 is almost full of sewage. When the inside of the sewage basin 4 is almost full of sewage, the air tank 21 can be securely closed and the vacuum valve 6 can be protected from entering the sewage, which is most convenient.

  Alternatively, by providing the air intake port 22d of the air intake pipe 22 below the partition plate 14, the air tank 21 is quickly closed when the amount of sewage inside the sewage tank 4 exceeds a specified amount, and the vacuum valve 6 Can be protected from the ingress of sewage.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modifications are shown, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

DESCRIPTION OF SYMBOLS 1 Vacuum valve unit 4 Sewage tank 5 Sewage suction pipe 6 Vacuum valve 14 Partition plate 8a, 8b Air inlet 21 Air tank 22 Air intake pipe 22d Air intake 23 Sewage intrusion prevention mechanism 26 Liquid level operation type valve mechanism 31 Valve part 32 Float member 33 Air hole 34 Valve seat 35 Valve body 36 Conical part 43 Guide rod 45 Insect-proof member 61 Hose

Claims (8)

A sewage tank capable of storing sewage and a vacuum valve connected to a sewage suction pipe capable of sucking sewage inside the sewage tank so as to be opened and closed;
In the valve operating air supply structure of a vacuum valve unit, the vacuum valve has an air inlet capable of introducing valve operating air.
In the inside of the sewage basin, a closed container-like air tank connected to the air inlet is provided in an independent state with respect to the ground ,
An air intake pipe capable of taking air inside the sewage tank into the air tank is provided,
The air intake pipe is provided with a sewage intrusion prevention mechanism capable of preventing sewage inside the sewage basin from entering the air tank ,
The air tank is provided above a partition plate provided to partition the inside of the sewage tank in the vertical direction,
An air supply structure for operating a valve of a vacuum valve unit, wherein an air intake port of the air intake pipe is provided downward at a position above the partition plate .   The sewage intrusion prevention mechanism provided in the air intake pipe is constituted by a liquid level actuated valve mechanism that closes the air intake pipe by utilizing the rise of the sewage liquid level inside the sewage tank. The air supply structure for valve operation of the vacuum valve unit according to claim 1. The liquid level actuated valve mechanism includes a valve part that can be opened and closed, and a float member that opens and closes the valve part using a change in the liquid level of sewage,
The valve portion includes a valve seat having an air hole penetrating in the vertical direction, and a valve body disposed below the valve seat so as to be movable up and down by the float member,
3. The air supply structure for valve operation of a vacuum valve unit according to claim 2 , wherein the valve body has a thin conical body portion capable of closing the air hole from below. The valve operating air supply structure for a vacuum valve unit according to claim 3 , wherein the valve body has a guide rod which can be inserted into the air hole of the valve seat at the top.   The air supply for valve operation of the vacuum valve unit according to any one of claims 1 to 4, wherein an insect repellent member capable of preventing insects from entering is provided inside the air intake pipe. Construction.   6. The valve operating air supply structure for a vacuum valve unit according to claim 1, wherein the air intake pipe is directly attached to an upper side surface of the air tank. The air intake pipe is provided separately from the air tank,
The air supply structure for valve operation of a vacuum valve unit according to any one of claims 1 to 5, wherein the air intake pipe and the air tank are connected via a flexible hose. The liquid level actuated valve mechanism is provided outside the air tank;
The air supply structure for valve operation of a vacuum valve unit according to any one of claims 2 to 7, wherein a water drain hole is provided in the air tank .