JP5328515B2 - Blower installation structure and sewage treatment facility remodeling method - Google Patents

Description

  The present invention relates to a blower that supplies air to a treatment tank of a sewage treatment facility and a method for remodeling the sewage treatment facility.

  The sewage treatment facility has a plurality of treatment tanks for purifying sewage and an equipment storage room in an area separated from the installation area of the treatment tank, and various equipment for operating the treatment tank is placed in the equipment storage room. Has been.

  The treatment tank is composed of a plurality of water tanks in which concrete is placed in a plurality of spaces formed by excavating the ground. A concrete ceiling slab extends between and around adjacent treatment tanks, and air is supplied to sludge piping and pumping equipment in the lower space of the ceiling slab, and to the air diffuser installed in the treatment tank. A duct for installing a blower pipe and the like is provided.

  A blower is installed in the device housing chamber, and a necessary amount of air is supplied to the diffuser through a blower pipe connected to the blower.

In recent years, with the aging of such sewage treatment facilities, there is a need to renovate the facilities. In such a case, the equipment storage room is equipped with various equipment such as an existing blower, so it is not possible to secure a space for installing new equipment, or along the existing piping installed in the duct. In some cases, it is not possible to secure a space for installing new piping. In such a case, there is a problem that if the new equipment is arranged after the existing equipment is removed, the existing equipment must be stopped for a long time.

  In recent years, a single-stage turbo blower in which an electric motor having high air blowing efficiency and an impeller are directly connected has attracted attention.

  For example, by arranging such a directly connected single-stage turbo blower in the vicinity of the treatment tank and blowing air to the air diffuser through a short length of piping, the initial cost and power cost of the piping can be suppressed. it can.

  When such a blower is used, there is a problem that it is necessary to reduce a large noise, and there is a problem that a fan for cooling a control panel including an inverter circuit for controlling the rotational speed of the blower is required.

  As shown in FIG. 16, in Patent Document 1, in order to solve such a problem, a blower 101 is mounted on the upper part of the casing 100, and an electronic device 102 such as an inverter circuit is installed on the lower part thereof. An air blower in which a louver 103 is attached to one surface of the 100 has been proposed.

  The air blower is provided with a silencer cover member 104 inside the louver 103, sucking air through the louver 103 by the blower 101, cooling the electronic device 102 such as an inverter circuit with the sucked air, and blowing the air. It is configured to discharge from the tube 105.

Korean Registered Patent No. 100572850

  However, when the air blower described in Patent Document 1 is employed, there are the following problems.

  Since pipes and equipment are arranged in existing ducts, there are problems in that it is not possible to secure a space for installing large blowers in the ducts, and ceiling slabs that do not have sufficient strength as enclosures. It is a problem that it is dangerous to install a blower having a weight of tons.

  Therefore, it is conceivable to install the blower and the drive circuit such as the inverter circuit separately, but if the drive circuit is installed outdoors such as a ceiling slab, it will be exposed to the sun and will not be cooled sufficiently and overheated. May cause a malfunction, and also requires consideration for wind and rain, and a complicated waterproof ventilation structure is required.

  In addition, when the drive circuit is installed in the duct, a fan for cooling the drive circuit is required, and when the cooling air is blown into the duct, the duct becomes hot and the working environment of the worker is deteriorated. The problem arises.

  In view of the above-described problems, the object of the present invention is to efficiently remodel the installation structure and equipment of a blower device that can be installed in a limited space without incurring an increase in cost or environmental degradation. The point is to provide a method for renovating sewage treatment facilities.

  In order to achieve the above-mentioned object, the first characteristic configuration of the blower installation structure according to the present invention is the air diffuser installed in the treatment tank of the sewage treatment facility as described in claim 1 of the claims. An air blower for supplying air and a blower installation structure provided with a drive circuit for driving the blower, wherein the blower is installed above the ceiling slab connected to the processing tank, and the circuit casing in which the drive circuit is accommodated is mounted on the ceiling. Installed in the duct formed in the lower space of the slab and installed the first blower pipe with one end connected to the circuit casing through the ceiling slab, and the air attracted by the blower is from the circuit casing It is in the point provided with the induction | guidance | derivation path | route guide | induced to an air blower via a 1st ventilation pipe.

  According to the above-described configuration, the air that is attracted by the blower is guided from the circuit casing to the blower via the first blower pipe by the attraction route, and therefore it is necessary to provide a separate cooling fan for cooling the drive circuit. Neither is it necessary to provide the circuit casing with a complicated waterproof ventilation structure. Moreover, by dividing | segmenting into an air blower and a circuit casing, even if it is a ceiling slab lightened to each block and intensity | strength is restrict | limited, the air blower in which the air blower was accommodated can fully be supported.

  In addition, since the pipe end part for sending air to the existing air diffuser extends to the ceiling slab side, an output pipe of a blower installed on the ceiling slab and a pipe for sending air to the air diffuser are provided. The blast pipe for connection can also be configured to be extremely short. Furthermore, since the air heated by the drive circuit is supplied to the diffuser, air having a temperature suitable for activating microorganisms in the treatment tank can be supplied from the diffuser.

  As described in the second aspect, the second characteristic configuration includes a blower housed in a blower casing installed on an upper portion of the ceiling slab, in addition to the first characteristic configuration described above. The end and the blower casing are connected.

  According to the above-described configuration, after the air attracted by the blower flows into the blower casing from the first blower pipe, the air is attracted from the suction pipe of the blower within the blower casing. If it is necessary to provide a silencing casing to reduce the loud noise generated by the blower, if such a silencing casing is used as the blower casing, the other end of the first blower pipe and the suction pipe of the blower It is no longer necessary to provide a pipe line for directly connecting to and can reduce the cost of parts, and even when installed outdoors, the blower is not directly exposed to wind and rain, The possibility of causing a failure or the like can be reduced.

  In the third feature configuration, as described in the third aspect, in addition to the second feature configuration described above, an opening serving as an adjustment attracting path for adjusting the amount of air attracted via the attracting path is a blower casing. It is in the point formed.

  According to the above-described configuration, there is a possibility that the amount of induced air passing through the inside of the circuit casing is too large, which may increase the pressure loss and increase the driving power of the blower. When there is a possibility of local action, the first air duct is not configured to have a large diameter, and is attracted via the attracting path by the amount of air attracted through the opening formed in the blower casing. The amount of air to be adjusted can be adjusted to ensure efficient and stable operation.

  The fourth characteristic configuration is that, as described in claim 4, in addition to the first characteristic configuration described above, the other end of the first blower pipe and the suction pipe of the blower are connected.

  According to the above-described configuration, the air attracted from the first blower pipe is efficiently sucked into the suction pipe of the blower via the suction pipe.

  In the fifth feature configuration, as described in claim 5, in addition to the fourth feature configuration described above, the branch pipe serving as an adjustment attracting path for adjusting the amount of air attracted through the attracting path is sucked. It is at a point connected to the tube.

  According to the above-described configuration, there is a possibility that the amount of induced air passing through the inside of the circuit casing is too large, which may increase the pressure loss and increase the driving power of the blower. When there is a possibility that the air acts locally, the amount of air attracted via the attraction route is reduced by the amount of air attracted via the branch pipe without configuring the first air duct to have a large diameter. It can be adjusted for efficient and stable operation.

  In the sixth feature configuration, in addition to any one of the first to fifth feature configurations described above, a suction port is formed in the circuit casing, and air passes through the suction port. It is in the point led to the 1st air duct.

  According to the above configuration, the air sucked by the blower is sucked from the suction port formed in the circuit casing, and after cooling the drive circuit arranged in the circuit casing, the blower is passed through the first blower pipe. Led to. In general, air in a corridor surrounded by concrete is cooler than outdoor air temperature, which is preferable in that the cooling effect on the drive circuit is increased and the risk of inhaling dust is reduced. In addition, since the air in the duct is sucked by the blower, ventilation due to the inflow of outside air is efficiently performed, and the risk of filling the duct with dangerous gas can be extremely reduced.

  In the seventh feature configuration, in addition to any of the first to fifth feature configurations described above, one end of the second blower pipe penetrating the ceiling slab is formed in the circuit casing. There exists in the point which the air attracted | sucked by the air blower is led to the 1st air duct from the other end side of the 2nd air duct via the circuit casing.

  According to the above configuration, the other end side of the second blower pipe penetrating the ceiling slab, that is, the air on the ceiling slab flows into the circuit casing through the second blower pipe, passes through the circuit casing, It is supplied to the blower via the first blower pipe. In this case, since the air in the corridor is not sucked, the inside of the corridor does not become an abnormal negative pressure without greatly changing the ventilation mechanism in the existing corridor.

  In the eighth feature configuration, as described in claim 8, in addition to the seventh feature configuration described above, a suction casing is formed in the blower casing through a partition wall, and a suction port formed in the suction casing is provided. The air sucked through the second air blow pipe is configured to flow into the circuit casing from the other end of the second blower pipe.

  According to the above-described configuration, since the other end side of the second air duct is connected to the suction casing, it is necessary to individually construct a suction structure on the other end side of the second air duct, that is, a seal structure against wind and rain. There is no, and it becomes possible to constitute in a compact and integrated with the blower casing.

In the ninth feature configuration, as described in claim 9, in addition to the eighth feature configuration described above, an opening serving as an adjustment attracting path for adjusting the amount of air attracted via the attracting path is a partition wall. It is in the point formed.

  According to the above-described configuration, there is a possibility that the amount of induced air passing through the inside of the circuit casing is too large, which may increase the pressure loss and increase the driving power of the blower. When there is a possibility of local action, the first air duct is not configured to have a large diameter, and is attracted via the attracting path by the amount of air attracted through the opening formed in the partition wall. The amount of air to be adjusted can be adjusted to ensure efficient and stable operation.

  In the tenth feature configuration, as described in claim 10, in addition to the seventh feature configuration described above, the other end of the first blower pipe and the suction pipe of the blower are connected to each other through the attraction route. The point is that a branch pipe serving as an adjustment attraction path for adjusting the amount of air to be supplied is connected to the suction pipe.

  According to the above-described configuration, there is a possibility that the amount of induced air passing through the inside of the circuit casing is too large, which may increase the pressure loss and increase the driving power of the blower. When there is a possibility that the air acts locally, the amount of air attracted via the attraction route is reduced by the amount of air attracted via the branch pipe without configuring the first air duct to have a large diameter. It can be adjusted for efficient and stable operation.

The eleventh characteristic configuration is the air sucked into the circuit casing through the second blower pipe in addition to any of the seventh to tenth characteristic configurations described above. A suction port for adjusting the amount is formed in the circuit casing.

According to the above configuration, the amount of air attracted to the circuit casing via the second air duct can be adjusted by the amount of air attracted from the suction port formed in the circuit casing. A degree of freedom can be given to the configuration of the flow path, and the cooling efficiency of the drive circuit can be improved.

  The twelfth characteristic configuration is the turbo blower in which, in addition to any of the first to eleventh characteristic configurations described above, the blower is a turbo blower in which the output shaft of the motor and the impeller are directly connected. The filter which removes dust from the air comprised and attracted by the air blower exists in the point provided in the intake part of air.

  According to the configuration described above, clean air from which dust has been removed by the filter is supplied to the blower, so that it is possible to avoid long-term stable operation while avoiding damage to the bearing due to dust. This is particularly effective when the bearing is an air bearing. Moreover, the noise of the air blower leaking outside can be effectively reduced by providing the filter with a silencing function. Further, it is possible to prevent a situation in which dust is attached to the drive circuit accommodated in the circuit casing and an accident such as a short circuit occurs.

  In the thirteenth feature configuration, as described in claim 13, in addition to the twelfth feature configuration described above, the operation portion is provided in the circuit casing, and the seal that keeps the operation portion and the inside of the circuit casing airtight. The structure is provided.

  When an operation unit, that is, an operation switch or a display device is installed in the circuit casing, dust is sucked together with air from a gap where these devices are installed, and there is a possibility that the bearing of the blower may be damaged. Therefore, by providing a seal structure that keeps the operation unit and the inside of the circuit casing airtight, such a problem can be solved and the reliability of the apparatus can be ensured.

  The characteristic structure of the installation method of the air blower according to the present invention includes a blower for supplying air to an air diffuser installed in a treatment tank of a sewage treatment facility, and a drive circuit for driving the blower as described in claim 14. A blower installation process for opening a ceiling slab connected to a processing tank to install a blower pipe, a blower installation process for installing a blower on the top of the ceiling slab, and a drive circuit. A circuit casing installation step of installing the accommodated circuit casing in a duct formed in the lower space of the ceiling slab, and a blower pipe connection that connects one end of the blower pipe to the blower and connects the other end of the blower pipe to the circuit casing. And a process.

  According to the above-described configuration, the blower is installed in the vicinity of the blower pipe installed in the blower pipe installation process, the circuit casing is further installed in the corridor below the blower pipe, and one end of the blower pipe is connected by the blower pipe connection process. The blower can be installed by a simple process of connecting the other end of the blower pipe and the circuit casing to the blower.

  As described in claim 15, the characteristic configuration of the method for renovating a sewage treatment facility according to the present invention is such that a duct is formed in the lower space of the ceiling slab connected to the treatment tank, and the diffuser installed in the treatment tank A method for renovating a sewage treatment facility in which a blower pipe for supplying air is installed in a corridor. A blower casing installation process for installing a blower casing, a circuit casing installation process for installing a circuit casing containing a drive circuit in a duct formed in a lower space of the ceiling slab, and connecting one end of the blow pipe to the blower casing. There is a point including a blower pipe connecting step of connecting the other end of the blower tube and the circuit casing, and a step of connecting the output pipe of the blower and the input pipe of the diffuser.

  According to the above-described configuration, even in a limited installation space, the blower can be properly installed in the vicinity of the treatment tank, and the sewage treatment facility can be remodeled efficiently.

  As described above, according to the present invention, the blower installation structure that can be installed in a limited space without causing an increase in cost or environmental degradation, and sewage treatment that can efficiently remodel the equipment. It is now possible to provide renovation methods for equipment.

Explanatory drawing of the installation structure of the air blower by this invention Side cross section of circuit casing Illustration of existing sewage treatment facility Illustration of existing sewage treatment facility Explanatory drawing which applied the reconstruction method of the sewage treatment equipment by the present invention Explanatory drawing which applied the reconstruction method of the sewage treatment equipment by the present invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of another embodiment of the installation structure of the air blower by this invention Explanatory drawing of conventional blower

  Hereinafter, the installation structure of the air blowing mechanism and the method for remodeling the sewage treatment facility according to the present invention will be described.

  As shown in FIG. 1, the air blower 20 includes a blower 21 that supplies air to the air diffuser 11 installed in the treatment tank 10 of the sewage treatment facility, and a drive circuit 30 that drives the blower 21.

  The blower casing 22 in which the blower 21 is accommodated is installed on the top of the ceiling slab 12 connected to the processing tank 10.

  The blower casing 22 has a sound-absorbing material attached to the inside of a frame formed of general structural rolled steel or the like, has a high sound deadening property, and has a high airtightness.

  The circuit casing 31 is installed on the floor slab 14 of the duct 13 formed in the lower space of the ceiling slab 12. The circuit casing 31 is also highly airtight, and includes a drive circuit 30 that drives and controls the blower 21 inside.

  The blower casing 22 and the circuit casing 31 are communicated with each other by a first blower pipe 40 that penetrates the ceiling slab 12, and air that is attracted by the blower 21 by the first blower pipe 40 is sent from the circuit casing 31 to the first blower. It becomes an attraction route guided to the blower 21 through the tube 40.

  The first blower pipe 40 is a pipe having an appropriate diameter according to the amount of air attracted by the blower 21 so that the flow velocity of the air does not become too high and the pressure loss does not become too large.

  When the blower 21 is driven, the air in the duct 13 is sucked into the circuit casing 31 through the suction port 41 formed in the circuit casing 31, and the air sucked into the circuit casing 31 is the first blower. It is guided into the blower casing 22 through the pipe 40 and is attracted to the blower 21.

With the configuration as described above, the drive circuit 30 is efficiently cooled by the air flow sucked into the circuit casing 31. Therefore, it is necessary to provide a separate cooling fan for cooling the drive circuit 30. Disappears. Moreover, since the circuit casing 31 is installed in the duct 13, it is not necessary to provide a complicated waterproof ventilation structure. Further, by dividing the blower casing 2 2 and the circuit casing 31, is lighter in each block, even the ceiling slab 12 the intensity is limited to be able to adequately support the blower casing 22 which blower 21 is accommodated become.

  In addition, since the edge part of the piping 15 for ventilating the existing air diffuser 11 is extended to the ceiling slab 12 side, the output pipe 23 of the blower 21 installed in the ceiling slab 12 and the air diffuser 11. The blower pipe 16 for connecting the pipe 15 for blowing air can also be configured to be extremely short. Furthermore, since the air heated by the drive circuit 30 is supplied to the diffuser 11, air having a temperature suitable for activating microorganisms in the treatment tank 10 can be supplied from the diffuser 11.

  In general, the air in the duct 13 surrounded by concrete is cooler than the outdoor air temperature, which is preferable in that the cooling effect on the drive circuit 30 is enhanced. Since the air is sucked by the blower 21, ventilation due to inflow of outside air is efficiently performed, and the risk that dangerous gas is filled in the duct 13 can be extremely reduced.

  It is preferable to connect the first air duct 40 to the ceiling surface of the circuit casing 31 in that it is not necessary to secure an installation space for the first air duct 40 on the side surface of the circuit casing 31. In addition, when there is sufficient space in the duct, the first blower pipe 40 may be configured to be connected to the side surface of the circuit casing 31.

  The blower 21 is configured by a single-stage turbo blower in which an output shaft of an electric motor and an impeller are directly connected. The suction port 41, which is an air intake portion, is provided with a filter 42 that prevents the passage of dust. By supplying clean air from which dust has been removed to the blower 21, damage to the bearing due to dust is avoided. Long-term stable operation becomes possible. In particular, the filter 42 functions effectively when the bearing is an air bearing. Furthermore, the filter 42 has a mute function and effectively reduces noise so that noise generated in the blower 21 does not leak to the outside.

Power line 3 9 which connects the blower 21 and the circuit casing 31 is housed inside conduit 43 extending through the ceiling slab 12, the conduit 43 is configured airtight so as not to inhale external air.

  The circuit casing 31 includes a converter 30a that converts an AC voltage into a DC voltage, an inverter 30b that converts the DC voltage converted by the converter 30a into an AC voltage having a desired frequency, a noise filter 30c, a sequencer 30d, and an electric motor for the blower 21. A breaker 30e to be protected, a drive circuit 30 having a buzzer 30f for notifying a failure of the blower 21, and an operation unit 36 for setting the start and stop of the blower 21 and the frequency of the inverter 30b are provided.

  As shown in FIG. 2, the drive circuit 30 is installed away from the back surface 33 by the rib 32 of the circuit casing 31. Since the air sucked from the suction port 41 passes around the drive circuit 30, the cooling effect is enhanced. In addition, it is preferable to provide the suction port 41 and the 1st ventilation pipe 40 so that the functional block which is easy to generate heat | fever like the converter 30a and the inverter 30b can be cooled effectively.

  For example, when the first air duct 40 is connected to the ceiling surface of the circuit casing 31, the suction port 41 is connected to the circuit casing so that the air flow to the first air duct 40 passes around the drive circuit 30. Preferably, it is formed below 31.

  The circuit casing 31 is provided with an operation portion 36 so that the operation door 38 installed on the front surface 34 can be opened and operated. As described above, when the operation unit 36, that is, an operation switch or a display device is installed in the circuit casing 31, air is sucked from a gap where these devices (switches, meters such as an ammeter, a liquid crystal panel, etc.) are installed. Alternatively, air may be blown out, affecting the efficiency of the blower 21 or dust being sucked in. Therefore, by providing the seal structure 37 that keeps the inside of the circuit casing 31 airtight, such a problem can be solved and the reliability of the apparatus can be ensured.

  Next, a method for renovating the sewage treatment facility will be described.

  As shown in FIGS. 3 and 4, in the existing sewage treatment facility, the raw water which is the treated water flows in and the coarse sediment contained in the treated water is removed. The water to be treated which has flowed in via 58 is diffused by the air diffuser 11 and is included in the water to be treated which has been aerobically treated by microorganisms and the water to be treated which has flowed from the treatment tank 10 via the water channel 59. A final sedimentation tank 51 for sedimenting activated sludge is provided.

  The initial sedimentation tank 50, the treatment tank 10, and the final sedimentation tank 51 are configured by placing concrete in a plurality of spaces excavated and formed on the ground. A concrete ceiling slab 12 is formed to extend between and around the adjacent first sedimentation tank 50, treatment tank 10 and final sedimentation tank 51, and sludge piping 52 and a drawing pump 53 facility in the lower space of the ceiling slab 12; Is provided with a duct 13 for installing a blower pipe 54 and the like for supplying air to the air diffuser 11 installed in the treatment tank 10.

  A device storage chamber 55 is constructed in a region separated from the installation region of the first settling tank 50, the processing tank 10 and the final settling tank 51, and the blower 56 and the drive circuit of the blower 56 are stored in the device storage chamber 55. Various devices for operating the circuit casing 57 and other processing tanks are arranged.

  In addition, in the case of remodeling equipment due to aging of sewage treatment equipment, it is necessary to replace equipment and piping while operating the existing equipment. Since various facilities are installed, there may be a case where a space for installing a new device cannot be secured, or a space for installing a new pipe along the existing pipe installed in the duct 13 may not be secured.

  Therefore, while operating existing equipment, the ceiling slab 12 is opened by the blower pipe installation process to install the blower pipe 40, and the blower casing 22 in which the blower 21 is accommodated in the upper part of the ceiling slab 12 by the blower casing installation process. The circuit casing 31 in which the drive circuit 30 is accommodated by the circuit casing installation process is installed in the duct 13 formed in the lower space of the ceiling slab 12, and one end of the blower pipe 40 and the blower casing 22 are installed by the blower pipe connection process. Are connected, the other end of the blower pipe 40 and the circuit casing 31 are connected by the blower pipe connecting step, and the output pipe 23 of the blower 21 and the pipe 15 for blowing air to the diffuser 11 may be connected.

  By renovating in this way, even in a limited installation space, the existing sewage treatment facility is operated without stopping the existing sewage treatment facility for a long period of time, as shown in FIGS. In addition, it is possible to appropriately install a blower in the vicinity of the treatment tank 10, and it is possible to suppress the initial cost and power cost of the pipe by blowing air to the diffuser 11 through a short length of pipe. .

  Hereinafter, another embodiment of the installation structure of the air blower according to the present invention will be described.

  In the above-described embodiment, the configuration in which the suction port 41 is formed only in the circuit casing 31 has been described. However, as shown in FIG. 7, the suction port 61 provided with the filter 62 for preventing the passage of dust also in the blower casing 22. May be formed. The suction port 61 serves as an attraction route for adjustment for adjusting the amount of air attracted via the attraction route.

  When the amount of the induced air passing through the circuit casing 31 is too large, there is a risk that the pressure loss increases and the driving power of the blower 21 is increased, or abnormal pressure due to cooling air is locally applied to the driving circuit 30. When there is a possibility of acting, the induction path is determined by the amount of air drawn through the suction port (opening) 61 formed in the blower casing 22 without configuring the first blow pipe 40 to have a large diameter. By adjusting the amount of air drawn through the air, efficient and stable operation can be achieved.

  In this case, it is preferable to provide the suction port (opening) 61 with a throttle mechanism capable of adjusting the opening area.

  In the above-described embodiment, the blower 21 is accommodated in the blower casing 22, and the first blower pipe 40 is connected to the blower casing 22, so that the air that is attracted by the blower 21 to the inside of the blower casing 22 is the circuit casing. Although the structure used as the induction | guidance | derivation path | route guide | induced to the air blower 21 via the 1st air blow pipe 40 from 31 was demonstrated, as shown in FIG. 8, the suction pipe of the air blower 21 and the 1st air blow are not provided. The pipe 40 may be connected by the elbow 63, and the elbow 63 may be configured to serve as an induction path for the air drawn by the blower 21 to be guided from the circuit casing 31 to the blower 21 via the first blower pipe 40.

  When employing such a configuration, the blower 21 may be housed in a soundproof casing.

  When the blower 21 is composed of a single-stage or multi-stage turbo blower in which the output shaft of the electric motor and the impeller are directly connected, the electric motor is housed in a casing (wind tunnel) connected to the suction pipe. The air is efficiently cooled by the air.

  In addition, when an electric motor is installed outside the casing of the blower, a fan mechanism for cooling the electric motor may be provided separately.

  Further, as shown in FIG. 9, the suction pipe of the blower 21 and the first blower pipe 40 may be connected by a branch pipe 64. The branch pipe 64 is configured such that the blower 21 can suck both the air in the duct via the first blow pipe 40 and the outdoor air, and the damper pipe 65 is provided with a damper 65 so that the suction port The amount of air guided to the circuit casing 31 via 41 can be adjusted, and air with an air volume suitable for cooling the drive circuit 30 can be supplied to the circuit casing 31. The damper 65 is preferably provided with a filter 65a that prevents the passage of dust. The branch pipe 64 and the damper 65 serve as an adjustment attracting path that adjusts the amount of air attracted via the attracting path.

  In the above-described embodiment, the case where the suction opening 41 for sucking the air in the duct is formed in the circuit casing 31 is described. However, the air is not limited to the case of sucking from the duct, and the outdoor air is sucked. You may comprise.

  For example, as shown in FIG. 10, one end 44 a of the second blower pipe 44 penetrating the ceiling slab 12 communicates with the circuit casing 31, and the air attracted by the blower 21 is the other end of the second blower pipe 44. You may comprise so that it may flow in into the circuit casing 31 from the 44b side, and may be guide | induced to the air blower casing 22 via the 1st ventilation pipe 40. FIG.

  By configuring in this way, the air on the other end 44b side of the second blower pipe 44 penetrating the ceiling slab 12, that is, outdoor air flows into the circuit casing 31 via the second blower pipe 44, and the drive circuit 30. Then, the air is supplied to the blower 21 through the first blower pipe 40. In this case, since the air in the duct 13 is not sucked, the inside of the duct 13 does not become an abnormal negative pressure without greatly changing the ventilation mechanism in the existing duct 13. .

  Furthermore, the suction casing 25 is formed in the blower casing 22 via the partition wall 24, and the air sucked through the suction port 41 formed in the suction casing 25 is from the other end 44 b side of the second blower pipe 44. By configuring to flow into the circuit casing 31, the other end 44 b side of the second blower pipe 44 is connected to the suction casing 25, so the suction structure on the other end 44 b side of the second blower pipe 44, that is, There is no need to individually construct a seal structure for wind and rain, and the air blower casing 22 can be integrated with a compact structure.

  The partition wall 24 is provided with a bypass path 26 as an opening serving as an adjustment induction path for supplying a part of the air sucked from the suction port 41 to the blower casing 22. The bypass path 26 is provided with a damper 27, which can adjust the amount of air attracted via the attracting path, that is, the amount of air guided to the circuit casing 31 via the second blower pipe 44. The air flow rate suitable for cooling the drive circuit 30 can be supplied to the circuit casing 31.

Further, as shown in FIG. 11, the circuit casing 31 may also be formed with a suction port 67 provided with a filter 66 that prevents the passage of dust. Thereby, the amount of air sucked into the circuit casing 31 via the second blower pipe 44 can be adjusted.

  Furthermore, not only the structure which forms the suction casing 25 in the air blower casing 22 via the partition wall 24 but the structure which connects the suction pipe of the air blower 21 and the 1st air blow pipe 40 with the branch pipe 68 as shown in FIG. It may be.

  The branch pipe 68 is configured such that the blower 21 can suck both the air in the corridor and the outdoor air through the first blow pipe 40, and the damper pipe 69 includes the damper 69 so that the suction port The amount of air guided to the circuit casing 31 via 41 can be adjusted, and air with an air volume suitable for cooling the drive circuit 30 can be supplied to the circuit casing 31. The branch pipe 68 and the damper 69 serve as an adjustment attracting path for adjusting the amount of air attracted via the attracting path. As shown in FIG. 13, a suction port 71 provided with a filter 70 that prevents passage of dust may also be formed in the circuit casing 31.

  In any embodiment, it is preferable that a filter for removing dust from the air attracted by the blower 21 is provided in the air intake portion. In particular, when the bearing of the blower 21 is an air bearing, It is effective to avoid damage. Moreover, the noise of the air blower leaking outside can be effectively reduced by providing the filter with a silencing function. Further, it is possible to prevent a situation in which dust is attached to the drive circuit accommodated in the circuit casing and an accident such as a short circuit occurs.

  In the above-described embodiment, the air attracted by the blower 21 is configured to pass through the entire circuit casing 31. For example, as shown in FIGS. 14 and 15, the circuit casing 31 includes a converter 30a and an inverter. The partition wall 35 may be formed so that only 30b has an airtight structure. Thereby, converter 30a and inverter 30b with a large calorific value can be cooled efficiently.

  In the above-described embodiment, the configuration in which the blower is configured by a directly connected single-stage turbo blower has been described. However, the turbo blower is not limited to a single stage but may be multi-staged.

  The blower is not limited to a direct-coupled turbo blower, and may be configured to transmit the power of the electric motor to the impeller via a belt or a transmission mechanism. In this case, as shown in FIG. 1 and the like, the air sucked by the blower 21 is configured to pass through the blower casing 22 so that the electric motor is cooled by the induced air without providing a separate cooling fan. be able to.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. Needless to say.

10: treatment tank 11: air diffuser 12: ceiling slab 13: duct 14: floor slab 15: piping 16: blower pipe 20: blower 21: blower 22: blower casing 23: output pipe 24: partition wall 25: suction Casing 26: Bypass path 27: Damper 30: Drive circuit 31: Circuit casing 32: Rib 33: Back surface 34: Front surface 35: Partition wall 36: Operation part 37: Sealing structure 38: Operation door 39: Power line 40: First air blowing Pipe 41: Suction port 42: Filter 43: Conduit pipe 44: Second blower pipe 44a: One end 44b: Other end 50: First sedimentation tank 51: Final sedimentation tank 52: Pipe 53: Extraction pump 54: Blower pipe 55: Equipment Storage chamber 56: Blower 57: Circuit casing 58, 59: Water channel

Claims (15)

A blower that supplies air to an air diffuser installed in a treatment tank of a sewage treatment facility, and an installation structure of a blower that includes a drive circuit that drives the blower,
A fan is installed on the top of the ceiling slab connected to the treatment tank, a circuit casing containing the drive circuit is installed in a duct formed in a lower space of the ceiling slab, and one end is connected to the circuit casing. The air blower is installed through the ceiling slab, and an air blower installation structure is provided with an induction path through which air attracted by the air blower is guided from the circuit casing to the air blower via the first air duct.   The blower installation structure according to claim 1, wherein the blower is housed in a blower casing installed on an upper portion of the ceiling slab, and the other end of the first blower pipe and the blower casing are connected.   The installation structure of the air blower according to claim 2, wherein an opening serving as an adjustment attracting path for adjusting the amount of air attracted via the attracting path is formed in the blower casing.   The blower installation structure according to claim 1, wherein the other end of the first blower pipe is connected to the suction pipe of the blower.   The blower installation structure according to claim 4, wherein a branch pipe serving as an adjustment induction path for adjusting the amount of air attracted via the induction path is connected to the suction pipe.   The air blower installation structure according to any one of claims 1 to 5, wherein a suction port is formed in the circuit casing, and air is guided to the first blower pipe through the suction port.   One end of the second blower pipe penetrating the ceiling slab is communicated with the circuit casing, and air attracted by the blower is guided from the other end side of the second blower pipe to the first blower pipe through the circuit casing. The installation structure of the air blower in any one of Claim 1 to 5.   A suction casing is formed in the blower casing via the partition wall, and the air sucked through the suction port formed in the suction casing is configured to flow into the circuit casing from the other end side of the second blower pipe. The installation structure of the air blower of Claim 7.   The installation structure of the air blower according to claim 8, wherein an opening serving as an adjustment induction path for adjusting an amount of air drawn through the induction path is formed in the partition wall.   8. The other end of the first blower pipe and the suction pipe of the blower are connected, and a branch pipe serving as an adjustment attracting path for adjusting the amount of air attracted via the attracting path is connected to the suction pipe. The installation structure of the blower. The installation structure of the air blower according to any one of claims 7 to 10, wherein a suction port for adjusting the amount of air sucked into the circuit casing through the second air duct is formed in the circuit casing.   12. The air blower includes a turbo blower in which an output shaft of an electric motor and an impeller are directly connected, and a filter that removes dust from air attracted by the blower is provided in an air intake unit. Installation structure of the blower.   The air blower installation structure according to claim 12, wherein an operation portion is provided in the circuit casing, and a seal structure is provided to keep the operation portion and the inside of the circuit casing airtight. A blower for supplying air to an air diffuser installed in a treatment tank of a sewage treatment facility, and a method for installing a blower equipped with a drive circuit for driving the blower,
A blower pipe installation step of opening a ceiling slab connected to the treatment tank and installing a blower pipe,
A fan installation step of installing a blower on the top of the ceiling slab;
A circuit casing installation step of installing a circuit casing in which the drive circuit is accommodated in a duct formed in a lower space of the ceiling slab;
An installation method of a blower device comprising: a blower pipe connecting step of connecting one end of a blower pipe and a blower, and connecting the other end of the blower pipe and a circuit casing. A renovation method of a sewage treatment facility in which a duct is formed in a lower space of a ceiling slab connected to a treatment tank, and a blower pipe that supplies air to an air diffuser installed in the treatment tank is installed in the duct,
A blower tube installation process for opening a ceiling slab and installing a blower tube,
A blower casing installation step of installing a blower casing in which a blower is housed in the upper part of the ceiling slab;
A circuit casing installation step of installing a circuit casing in which the drive circuit is accommodated in a duct formed in a lower space of the ceiling slab;
A blow pipe connecting step of connecting one end of the blow pipe and the blower casing, and connecting the other end of the blow pipe and the circuit casing;
A method for renovating a sewage treatment facility, comprising a step of connecting an output pipe of a blower and an input pipe of an air diffuser.

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