Blower

Abstract

This blower comprises: a pump; and a warning device. The warning device includes: a buzzer; a lamp; a control unit; and a cover which is secured to the pump. The cover is composed of a plurality of sections including a first cover section and a second cover section. The buzzer, the lamp, and the control unit are secured to the first cover section.

Description

blower

[0001] The present specification relates to a blower for a wastewater treatment device.

[0002] A blower is conventionally connected to wastewater treatment equipment. Gas (e.g., air) supplied by the blower is used for various treatments. For example, oxygen-containing gas is used for aerobic treatment. The gas agitates the water in the water treatment tank in order to clean the tank. The gas drives an air lift pump.

[0003] JP 2014-184372 A U.S. Pat. No. 4,115,770

[0004] If the gas supply from the blower to the wastewater treatment device is performed properly, the wastewater treatment device can properly treat the wastewater. If there is a problem with the gas supply, such as a gas leak in the piping connecting the blower and the wastewater treatment device, or a blower malfunction (e.g., a broken diaphragm), the possibility of improper wastewater treatment increases.

[0005] The present specification discloses a blower that includes an alarm device configured to indicate a malfunction.

[0006] The techniques disclosed in this specification can be implemented in the following application examples.

[0007] [Application Example 1] A blower for wastewater treatment equipment, comprising: a pump configured to output a gas containing oxygen; and an alarm device fixed to the pump, wherein the alarm device has a buzzer, a lamp, and a control unit configured to control the buzzer and the lamp according to the pressure of the gas output by the pump; and a cover fixed to the pump, wherein the cover has an inner surface and forms an internal space surrounded by the inner surface, the cover houses the buzzer and the control unit within the internal space, the cover is made up of a plurality of parts including a first cover part and a second cover part, and the buzzer, the lamp, and the control unit are fixed to the first cover part.

[0008] With this configuration, the buzzer, lamp, and control unit are fixed to a common first cover part, which reduces the complexity of manufacturing a blower with an alarm device compared to when the buzzer, lamp, and control unit are distributed across two or more cover parts.

[0009] Application Example 2 The blower according to Application Example 1, wherein the buzzer has: a vibrator; a drive device configured to vibrate the vibrator; and a first striking portion configured to be repeatedly struck by the vibrating vibrator to generate a first buzzer sound; and the alarm device has a second striking portion configured to be repeatedly struck by the vibrating buzzer to generate a second buzzer sound when the drive device vibrates the vibrator.

[0010] With this configuration, the alarm device can generate a loud sound that includes the first buzzer sound and the second buzzer sound.

[0011] Application Example 3 A blower for wastewater treatment equipment, comprising: a pump configured to output a gas containing oxygen; and an alarm device fixed to the pump, wherein the alarm device has a buzzer; and a control unit configured to control the buzzer in accordance with the pressure of the gas output by the pump; and a cover fixed to the pump, wherein the cover has an inner surface and defines an internal space surrounded by the inner surface, and the cover houses the buzzer and the control unit within the internal space, wherein the buzzer has: a vibrator; and a drive device configured to vibrate the vibrator; and a first striking part configured to be repeatedly struck by the vibrating vibrator to produce a first buzzer sound, and the alarm device has a second striking part configured to be repeatedly struck by the vibrating buzzer to produce a second buzzer sound when the drive device vibrates the vibrator.

[0012] With this configuration, the alarm device can generate a loud sound including the first buzzer sound and the second buzzer sound.

[0013] [Application Example 4] The blower according to Application Example 2 or 3, wherein the alarm device has a protruding portion that protrudes toward the buzzer, and an end of the protruding portion forms the second striking portion.

[0014] With this configuration, the second striking portion can be easily formed.

[0015] [Application Example 5] The blower according to any one of Application Examples 2 to 4, wherein the alarm device has a first forming portion that forms the second striking portion, the first forming portion is configured with one or more members that are separate from the cover, and the first forming portion is fixed to the cover.

[0016] According to this configuration, if the second striking portion is damaged, the first forming portion can be replaced without replacing the cover.

[0017] Application Example 6 The blower according to Application Example 5, wherein the cover has a recess forming portion that forms a recess provided on the interior space side of the cover, the first forming portion includes a first portion located within the recess and a second portion exposed to the interior space, and the second portion forms the second striking portion.

[0018] This configuration reduces the complexity of manufacturing a blower having a second striking portion.

[0019] [Application Example 7] The blower according to any one of Application Examples 2 to 6, wherein the second striking portion includes a flat outer surface, and the buzzer and the second striking portion are arranged such that the buzzer strikes the flat outer surface of the second striking portion.

[0020] With this configuration, the change in the position of the buzzer caused by striking the second striking portion is reduced compared to when the curved outer surface is struck by the buzzer.

[0021] Application Example 8 The blower according to any one of Application Examples 1 to 7, wherein the buzzer has a first member having a through hole, and the alarm device has: a fixing part that fixes the buzzer to the cover by passing through the through hole of the first member; and a position limiting part that limits a rotational position of the buzzer around the through hole by coming into contact with the buzzer.

[0022] This configuration reduces deviation in the rotational position of the buzzer.

[0023] Application Example 9 The blower according to Application Example 8, wherein the position limiting portion limits the rotational position of the buzzer by contacting the first member of the buzzer.

[0024] According to this configuration, the position limiting unit can appropriately limit the rotational position of the buzzer.

[0025] [Application Example 10] The blower according to any one of Application Examples 1 to 9, wherein the cover has a lower wall portion that is a wall portion on a lower side of the alarm device, and the lower wall portion has a through-hole.

[0026] With this configuration, the sound generated by the alarm device is output from inside the cover to the outside through the through-hole, allowing the alarm device to output a loud sound. Also, since the lower wall portion has a through-hole, the possibility of rainwater entering the cover through the through-hole is reduced.

[0027] The technology disclosed in this specification can be realized in various forms, for example, in the form of a blower, a wastewater treatment device having a blower and a water treatment tank, etc.

[0028] 1 is an explanatory diagram showing an embodiment of a wastewater treatment system. (A) and (B) are perspective views of a blower 30. A schematic diagram of the blower 30. (A)-(F) are schematic diagrams showing the configuration inside the recess 387 of the first cover part 300 and the configuration of the buzzer 500. (A)-(D) are schematic diagrams showing the operation of the buzzer 500. A schematic diagram showing the electrical configuration of the blower 30. (A) and (B) are schematic diagrams showing an embodiment of a pressure switch 600. A table showing the correspondence between the connection state of the switch 700, the operating mode of the alarm device 200, and the state of the alarm device 200. A flowchart showing an example of a manufacturing method for the blower 30. A schematic diagram of an alarm device of another embodiment. (A) is a schematic diagram of an alarm device of another embodiment. (B) is a schematic diagram showing the configuration inside the recess 387c of the first cover part 300c. A schematic diagram of an alarm device of another embodiment.

[0029] A. First embodiment: A1. Configuration of wastewater treatment system: Fig. 1 is an explanatory diagram showing an embodiment of a wastewater treatment system. The wastewater treatment system 10 of this embodiment includes a wastewater treatment device 20 and a blower 30 connected to the wastewater treatment device 20 via a connecting pipe 40. The blower 30 supplies air, which is an example of a gas containing oxygen, to the wastewater treatment device 20 via the connecting pipe 40.

[0030] The wastewater treatment device 20 purifies wastewater from ordinary households and the like (such a device is also called a "septic tank"). The wastewater treatment device 20 may have one or more various water treatment tanks. Although not shown in the figures, in this embodiment the wastewater treatment device 20 has an impurity removal tank, an anaerobic treatment tank, an aerobic treatment tank, a treated water tank, and a disinfection tank. The wastewater is treated in this order by these water treatment tanks. The impurity removal tank separates solids from the wastewater. The anaerobic treatment tank performs anaerobic treatment using anaerobic microorganisms. The aerobic treatment tank performs aerobic treatment using aerobic microorganisms. The treated water tank temporarily stores water from the aerobic treatment tank. The disinfection tank disinfects the water from the treated water tank.

[0031] The wastewater treatment device 20 may include various devices that operate using the air from the blower 30. Although not shown, in this embodiment, the wastewater treatment device 20 includes an aeration device disposed in the aerobic treatment tank and an air lift pump that transfers water from the treatment tank to the impurity removal tank. The aeration device discharges air from the blower 30 into the water, thereby supplying oxygen to the water. Aerobic microorganisms use the oxygen in the water to perform aerobic treatment. The air lift pump uses the air from the blower 30 to transfer water from the treatment tank to the impurity removal tank, thereby circulating the water through multiple water treatment tanks. Within the wastewater treatment device 20, a pipe connected to the connecting pipe 40 branches into a pipe connected to the aeration device and a pipe connected to the air lift pump.

[0032] 1, the wastewater treatment device 20 is buried under the ground 90. Alternatively, the wastewater treatment device 20 may be installed above ground.

[0033] For proper water treatment by the wastewater treatment device 20, it is preferable that the blower 30 properly supplies air to the wastewater treatment device 20. If there is a problem with the air supply (such as damage to the connecting pipe 40 or a malfunction of the blower 30 (e.g., damage to the diaphragm)), the possibility of improper wastewater treatment increases. The blower 30 of this embodiment has, in addition to the pump 100 configured to output air, an alarm device 200 configured to notify of a problem with the air supply.

[0034] A2. Configuration of blower 30: Figures 2(A) and 2(B) are perspective views of blower 30. The figures show mutually perpendicular directions X, Y, and Z that are pre-assigned to blower 30. When blower 30 is installed on a horizontal surface (e.g., horizontal ground), the first direction X and second direction Y are horizontal directions, and third direction Z is the vertically upward direction. Hereinafter, third direction Z will also be referred to as upward direction Z. Direction X will also be referred to as the +X direction, and the direction opposite direction X will also be referred to as the -X direction. The same applies to the +Y direction, -Y direction, +Z direction, and -Z direction.

[0035] 3 is a schematic diagram of the blower 30. A schematic diagram of the internal configuration of the pump 100 as seen from the side is shown in the lower left part of the figure. An exploded perspective view of the alarm device 200 is shown in the upper right part of the pump 100. The wiring of the alarm device 200 is omitted from the figure.

[0036] The configuration of the pump 100 may be the same as that of a known blower without an alarm device, except for the flexible tube 38 (described later). In this embodiment, the pump 100 is a diaphragm-type pump. The pump 100 has a metal case 110. A discharge port 190 is provided on the side surface of the case 110 (FIG. 2A) facing the first direction X. A connection port 180 is provided on the side surface of the case 110 (FIG. 2B) facing the -X direction. A cover 120 is attached to the upper side of the case 110 in the Z direction. The case 110 (FIG. 3) has an intake port 139 located below the cover 120. Although not shown, a filter covering the intake port 139 is located below the cover 120.

[0037] The pump 100 (FIG. 3) has a gas output device 130 housed in a case 110. The gas output device 130 has a solenoid 131, a vibrator 132, two pressure chambers 133 and 134, and a tank 135. The pressure chambers 133 and 134 are respectively fitted with diaphragms 133d and 134d, intake valves 133i and 134i, and discharge valves 133o and 134o. The pressure chambers 133 and 134 are formed from resin (e.g., polybutylene terephthalate). The diaphragms 133d and 134d and the valves 133i, 134i, 133o, and 134o are formed from an elastic body (e.g., rubber). A permanent magnet (not shown) is fixed to the vibrator 132.

[0038] The solenoid 131 uses externally supplied power (in this embodiment, AC voltage) to vibrate the vibrator 132. The vibration of the vibrator 132 causes the diaphragms 133d and 134d to vibrate. As a result, the volumes of the pressure chambers 133 and 134 repeatedly increase and decrease. When the volumes of the pressure chambers 133 and 134 increase, the pressure chambers 133 and 134 draw air from outside the blower 30 through the intake port 139 and the intake valves 133i and 134i. When the volumes of the pressure chambers 133 and 134 decrease, the pressure chambers 133 and 134 output air to the tank 135 through the discharge valves 133o and 134o. A discharge port 190 is connected to the tank 135. The air in the tank 135 is discharged to the outside of the blower 30 through the discharge port 190. A connection port 180 is also connected to the tank 135. The connection port 180 is connected to a flexible tube 38, which will be described later.

[0039] The alarm device 200 (FIG. 3) has a cover 210. The cover 210 has a container-shaped first cover part 300 that forms a recess 387 recessed in the -X direction, and a second cover part 400 that closes an opening 388 in the first cover part 300. The first cover part 300 is made of resin (polycarbonate in this embodiment). The second cover part 400 is made of metal (aluminum in this embodiment).

[0040] 4(A)-4(F) are schematic diagrams showing the configuration inside the recess 387 of the first cover part 300 and the configuration of the buzzer 500. FIGS. 4(A) and 4(B) show the configuration inside the recess 387 of the first cover part 300. These figures show the first cover part 300 as viewed in the -X direction. The wall part 370 on the -X direction side of the first cover part 300 (referred to as the side wall part 370) forms the bottom of the recess 387. As shown in FIG. 4(B), the buzzer 500 and the pressure switch 600 are fixed to the side wall part 370. Additionally, a lamp 990 and a switch 700 are fixed to the first cover part 300 (FIG. 2(B)).

[0041] A3. Arrangement of buzzer 500: Figure 4(C) is a schematic diagram of buzzer 500. The figure shows a perspective view of buzzer 500. Buzzer 500 has a base member 510 and a case 590 fixed to base member 510. In the figure, case 590 is shown by a dotted line, and buzzer 500 seen through case 590 is shown by a solid line.

[0042] The base member 510 is a U-shaped metal plate. The base member 510 has a first base portion 513 disposed on the −X direction side (lower side in the figure), a second base portion 517 extending in the +X direction from the end of the first base portion 513 on the +Z direction side (left side in the figure), and a third base portion 519 extending in the −Z direction from the end of the second base portion 517 on the +X direction side. A through-hole 514 is formed in the −Z direction end 511 (also referred to as the first portion 511) of the first base portion 513. In addition, a protrusion 512 protruding in the −X direction is connected to the connection between the first base portion 513 and the second base portion 517. The protrusion 512 is formed by bending a portion of the second base portion 517 in the −X direction.

[0043] A cylindrical coil 570 extending in the +X direction is disposed between the first base portion 513 and the third base portion 519. The coil 570 is fixed to the base member 510 via an insulating member (not shown). The buzzer 500 further includes a vibrator 580. Although not shown, the third base portion 519 has a through-hole through which the vibrator 580 passes. The vibrator 580 extends from the +X direction side of the third base portion 519 to the −X direction side of the coil 570, passing through the through-hole in the third base portion 519 and a through-hole on the inner periphery of the coil 570.

[0044] Two terminals 595 and 596 are fixed to the third base portion 519 via an insulator (not shown). These terminals 595 and 596 are connected to the coil 570. As shown in FIG. 3, each of the terminals 595 and 596 is exposed to the outside of the case 590. The coil 570 (FIG. 4C) uses power (in this embodiment, AC voltage) supplied to the terminals 595 and 596 to vibrate the vibrator 580 parallel to the first direction X. A permanent magnet may be fixed to the vibrator 580. As will be described later, when the vibrator 580 vibrates, the third base portion 519 is repeatedly struck by the vibrating vibrator 580, generating a buzzer sound (also referred to as a first buzzer sound).

[0045] 4(D) and 4(E) are perspective views of the buzzer 500 and the side wall 370 of the first cover part 300. A first fixed boss 321 is formed on the +X direction side (i.e., the inner side) of the side wall 370. FIGS. 4(D) and 4(E) show a portion of the base member 510 of the buzzer 500, the first fixed boss 321, and a portion of the side wall 370. FIG. 4(D) shows an exploded perspective view. As shown in the figure, the first fixed boss 321 has a cylindrical shape extending from the side wall 370 in the +X direction. A screw hole 322 extending in the −X direction is formed in the end of the first fixed boss 321 on the +X direction side. The first base part 513 is fixed to the first fixing boss 321 by threading the screw 329, which passes through the through hole 514 of the first part 511 of the buzzer 500, into the screw hole 322 of the first fixing boss 321 (the outer diameter of the screw head of the screw 329 is larger than the inner diameter of the through hole 514). In this way, the buzzer 500 is fixed to the first cover part 300.

[0046] As shown in FIGS. 4A, 4D, and 4E, a wall portion 330 surrounding the first fixed boss 321 is formed on the side wall portion 370 of the first cover part 300. The wall portion 330 has a U-shape extending from the side wall portion 370 in the +X direction. In this embodiment, the first fixed boss 321 and the wall portion 330 are connected by a plurality of plate portions 339. As shown in FIG. 4D, the wall portion 330 is higher than the first fixed boss 321 (this height is the height from the side wall portion 370 in the +X direction). That is, the wall portion 330 extends further in the +X direction than the first fixed boss 321. Furthermore, in FIG. 4B, the shape of a surface 330i on the inner periphery side of the wall portion 330 (here, the first fixed boss 321 side) is approximately the same as the shape of the edge of the first portion 511 of the first base portion 513. As shown in Figures 4(B) and 4(E), the first part 511 of the first base part 513 is fitted into the inner side of the wall portion 330, and the first base part 513 is fixed to the first fixing boss 321.

[0047] In this embodiment, the buzzer 500 is fixed to the first fixing boss 321 (i.e., the first cover portion 300) by a single screw 329. In this case, the buzzer 500 can rotate around the through-hole 514 of the first portion 511. In this embodiment, the wall portion 330 contacts the edge of the first base portion 513, thereby restricting the rotation of the first base portion 513 (and therefore the buzzer 500). For example, in FIG. 4B , when the buzzer 500 attempts to rotate clockwise, the portion 330a on the +Y direction side of the wall portion 330 contacts the end 513a on the +Y direction side of the first base portion 513, thereby preventing the rotation of the buzzer 500. When the buzzer 500 attempts to rotate counterclockwise, the portion 330b on the −Y direction side of the wall portion 330 contacts the end 513b on the −Y direction side of the first base portion 513, thereby preventing the rotation of the buzzer 500. In this way, the wall portion 330 limits the rotational position of the buzzer 500 around the through-hole 514 by contacting the buzzer 500 .

[0048] As shown in Figures 4A and 4B, a boss 340 is formed on the side wall 370 of the first cover part 300 and is located on the +Y direction side of the buzzer 500. The boss 340 has a rectangular parallelepiped shape extending in the +X direction from the side wall 370. In Figure 4B, when the buzzer 500 attempts to rotate clockwise, the boss 340 contacts the +Y direction surface of the case 590 of the buzzer 500, thereby preventing the buzzer 500 from rotating. In this way, the boss 340 limits the rotational position of the buzzer 500 around the through-hole 514 (Figure 4D) by contacting the buzzer 500.

[0049] 4(F) is a perspective view of the buzzer 500 and the side wall portion 370 of the first cover part 300. The side wall portion 370 is formed with a boss 311 for generating a buzzer sound different from the first buzzer sound described above (hereinafter, the boss 311 will also be referred to as the sound boss 311). The sound boss 311 has a cylindrical shape extending in the +X direction from the side wall portion 370. The end of the sound boss 311 on the +X direction side is formed with a screw hole 312 ( FIG. 4(A) ) extending in the −X direction.

[0050] FIG. 4(F) shows the buzzer 500, the first fixed boss 321, the wall portion 330, the sound boss 311, and a portion of the side wall portion 370. As shown in the figure, a screw 313 is threaded into the screw hole 312 of the sound boss 311. In this embodiment, the screw 313 has a screw head 314 that forms a flat top surface 315. In this embodiment, the screw 313 is a flat head screw. The top surface 315 is formed with a groove for receiving the end of a screwdriver. The screw 313 is made of metal (e.g., stainless steel). When the buzzer 500 is fixed to the first fixed boss 321, the protrusion 512 of the buzzer 500 contacts the top surface 315 of the screw 313. The sound boss 311 and the screw 313 together form a protrusion 310 that protrudes toward the buzzer 500.

[0051] A4. Operation of the buzzer 500: Figures 5(A) to 5(D) are schematic diagrams illustrating the operation of the buzzer 500. These figures show cross sections perpendicular to the second direction Y of a part of the first cover part 300 and a part of the buzzer 500.

[0052] 5A and 5B show the configuration of the buzzer 500. A through-hole 518 for the vibrator 580 is formed in the third base portion 519 of the base member 510. The vibrator 580 has a first portion 581 located on the +X direction side (upper side in the figure) of the third base portion 519 and a second portion 582 connected to the −X direction side of the first portion 581. The first portion 581 has a disk shape perpendicular to the first direction X. The second portion 582 extends from the first portion 581 through the through-hole 518 and a through-hole on the inner periphery of the coil 570 to the −X direction side of the coil 570. The second portion 582 has a cylindrical shape extending in the first direction X. The outer diameter of the first portion 581 is larger than the outer diameter of the second portion 582 and the inner diameter of the through-hole 518. The leaf spring 560 is disposed between the second portion 582 and the first base portion 513. The leaf spring 560 applies a force to the second portion 582 in the +X direction.

[0053] When an AC voltage is applied to the coil 570, the coil 570 vibrates the vibrator 580 parallel to the first direction X. FIG. 5A shows a state in which the vibrator 580 moves in the +X direction, and FIG. 5B shows a state in which the vibrator 580 moves in the −X direction. In FIG. 5A, the first portion 581 of the vibrator 580 is separated from the third base portion 519. In FIG. 5B, the first portion 581 is in contact with the third base portion 519. When the vibrator 580 vibrates, the state shown in FIG. 5A and the state shown in FIG. 5B are alternately repeated. The first portion 581 of the vibrator 580 repeatedly strikes the third base portion 519. This generates a first buzzer sound. Hereinafter, the third base portion 519 will also be referred to as the first striking portion 519.

[0054] 5(C) and 5(D) show another aspect of the operation of the buzzer 500. When the vibrator 580 (FIGS. 5(A) and 5(B)) vibrates, the coil 570, which provides the vibrating force to the vibrator 580, may vibrate due to a reaction. The vibration of the coil 570 causes the base member 510 connected to the coil 570 to vibrate. In this embodiment, the first portion 511 of the base member 510 is fixed to the first fixed boss 321. A portion of the base member 510 away from the first portion 511 is vibrable. In this embodiment, the protrusion 512 vibrates when the vibrator 580 vibrates. For example, the protrusion 512 vibrates due to deformation of one or both of the first base portion 513 and the first cover portion 300 (e.g., the first fixed boss 321).

[0055] FIG. 5(C) shows a state in which the protrusion 512 has moved in the -X direction, and FIG. 5(D) shows a state in which the protrusion 512 has moved in the +X direction. In FIG. 5(C), the protrusion 512 is in contact with the top surface 315 of the screw 313. In FIG. 5(D), the protrusion 512 is separated from the screw 313. When the protrusion 512 vibrates, the state of FIG. 5(C) and the state of FIG. 5(D) are repeated alternately. The protrusion 512 repeatedly strikes the top surface 315 of the screw 313. This generates a second buzzer sound. Hereinafter, the top surface 315 will also be referred to as the second striking portion 315.

[0056] A5. Arrangement of the Pressure Switch 600: As shown in FIG. 4A, a second fixed boss 351 is formed on the +X direction side (i.e., the inner side) of the side wall portion 370 of the first cover portion 300. The second fixed boss 351 has a cylindrical shape extending in the +X direction from the side wall portion 370. A screw hole 352 extending in the −X direction is formed in the end of the second fixed boss 351 on the +X direction side. As shown in FIG. 4B, the pressure switch 600 has a fixing protrusion 690. The protrusion 690 has a through hole 692. The protrusion 690 is fixed to the second fixed boss 351 by threading a screw 359 passing through the through hole 692 into the screw hole 352 of the second fixed boss 351. This fixes the pressure switch 600 to the first cover portion 300.

[0057] A wall portion 360 for positioning the pressure switch 600 is formed on the side wall portion 370 of the first cover portion 300. The wall portion 360 comes into contact with the pressure switch 600, thereby preventing the pressure switch 600 from shifting out of position.

[0058] A6. First cover portion 300 and second cover portion 400: As shown in Figure 4A, four third fixing bosses 391 are formed on the +X direction side (i.e., the inner side) of the side wall portion 370 of the first cover portion 300. The third fixing bosses 391 have a cylindrical shape extending in the +X direction from the side wall portion 370. A screw hole 392 extending in the -X direction is formed in the end of each third fixing boss 391 on the +X direction side.

[0059] As shown in FIG. 3 , the second cover part 400 has a plate part 410, which is a flat plate perpendicular to the first direction X, and two legs 420. The two legs 420 are connected to the end of the plate part 410 on the +Y direction side and the end on the −Y direction side, respectively. The plate part 410 is a rectangular plate with rounded corners. Through holes 490 are provided near each of the four corners of the plate part 410. The four third fixing bosses 391 of the first cover part 300 correspond to the four through holes 490, respectively. The second cover part 400 is fixed to the first cover part 300 by threading screws 910 that pass through the through holes 490 into the screw holes 392 of the third fixing bosses 391.

[0060] The plate portion 410 of the second cover portion 400 (FIG. 3) has an inner surface 480 that faces the first cover portion 300. The first cover portion 300 has the inner surface 380 that forms a recess 387. The first cover portion 300 and the second cover portion 400 form an internal space 389 surrounded by the inner surfaces 380, 480. The buzzer 500 and the pressure switch 600 are housed in the internal space 389.

[0061] Each leg 420 of the second cover part 400 has a first part 421 extending in the -Z direction and a second part 422 extending in the +X direction from the end of the first part 421 on the -Z direction side. A through-hole 423 is provided in the second part 422. As shown in FIG. 2A, the second cover part 400 (and thus the alarm device 200) is fixed to the case 110 of the pump 100 by a screw 920 passing through the through-hole 423. Note that in FIG. 2A, the leg 420 on the +Y direction side is hidden behind the first cover part 300. Although not shown, this leg 420 is also fixed to the case 110 by a screw 920 passing through the through-hole 423.

[0062] A7. Arrangement of the Lamp 990: As shown in FIG. 3 , a through-hole 306 is formed in the upper wall portion 308, which is the wall portion on the upper Z side of the first cover portion 300. A lamp 990 ( FIG. 2(A) ) is fixed in this through-hole 306. The lamp 990 has a light-emitting device (e.g., an LED, a light bulb, etc.). The structure for fixing the lamp 990 may be any structure. Although not shown, in this embodiment, the lamp 990 has a male screw for fixing. The lamp 990 is inserted into the through-hole 306 from the outside of the first cover portion 300. Inside the first cover portion 300, a nut is screwed onto the male screw of the lamp 990. This fixes the lamp 990 to the first cover portion 300.

[0063] A8. Arrangement of the Electric Cords 34, 36, Flexible Tube 38, Switch 700, and Through-Hole 305: Four through-holes 301, 302, 303, and 304 and a plurality of through-holes 305 are provided in the lower wall portion 309, which is the wall portion on the −Z direction side (i.e., downward side) of the first cover portion 300 ( FIG. 3 ). The first electric cord 34 connected to the electric plug 32 is inserted into the first through-hole 301. The flexible tube 38 connected to the tank 135 of the pump 100 is inserted into the second through-hole 302. The flexible tube 38 is made of, for example, rubber. The second electric cord 36 connected to the gas output device 130 of the pump 100 is inserted into the third through-hole 303. Fixing members (not shown) are attached to each of these through-holes 301, 302, and 303.

[0064] A switch 700 ( FIG. 2B ) is fixed in the fourth through-hole 304. The configuration for fixing the switch 700 may be any configuration. Although not shown in the drawings, in this embodiment, the switch 700 has a male screw for fixing. The switch 700 is inserted into the fourth through-hole 304 from the inside of the first cover part 300. On the outside of the first cover part 300, a nut of a nut-equipped cap is screwed onto the male screw of the switch 700. This fixes the switch 700 to the first cover part 300.

[0065] A plurality of through holes 305 (FIG. 3) directs sound generated by the alarm 200 from inside the cover 210 to outside.

[0066] A9. Electrical Configuration: Figure 6 is a schematic diagram showing the electrical configuration of the blower 30. The alarm device 200 is connected to the second electrical cord 36 and flexible tube 38 from the pump 100, and the first electrical cord 34 from the electrical plug 32. In this embodiment, the electrical plug 32 and the electrical cords 34, 36 are compatible with a single-phase AC power supply and have a voltage line L (also called Live), a neutral line N, and a ground line GND (also called Earth).

[0067] The switch 700 has six terminals T1 to T6. The switch 700 is a manual switch (e.g., a toggle switch) that selects one of three connection states described below. The lamp 990 has two terminals 991 and 992.

[0068] The pressure switch 600 has two terminals Ta and Tb. The flexible tube 38 is connected to the pressure switch 600. The pressure switch 600 switches the connection state between the terminals Ta and Tb depending on the pressure of the air supplied by the flexible tube 38. In this embodiment, when the pressure is less than a threshold value, the pressure switch 600 connects the terminals Ta and Tb. When the pressure is equal to or greater than the threshold value, the pressure switch 600 cuts off the path between the terminals Ta and Tb.

[0069] In this embodiment, the outlet 190 (FIG. 3) and the connection port 180 are connected to the tank 135, and the flexible tube 38 is connected to the connection port 180. That is, the flexible tube 38 is in communication with the outlet 190. The pressure of the air supplied by the flexible tube 38 is approximately the same as the pressure of the air at the outlet 190. Therefore, the connection state between the terminals Ta and Tb changes depending on the pressure at the outlet 190.

[0070] If there is a problem with the air supply by blower 30, such as damage to connecting pipe 40 (FIG. 1) or damage to one or both of diaphragms 133d and 134d (FIG. 3), the air pressure at outlet 190 will be lower than when there is no problem with the air supply. The pressure threshold is determined in advance through experiments so that the pressure when there is no problem is equal to or greater than the threshold, and the pressure when there is a problem is less than the threshold.

[0071] The pressure switch 600 may have any configuration. Figures 7(A) and 7(B) are schematic diagrams showing an embodiment of the pressure switch 600. Figure 7(A) shows a case where the pressure P of the air supplied by the flexible tube 38 is equal to or greater than the threshold value Pth, and Figure 7(B) shows a case where the pressure P is less than the threshold value Pth. In this embodiment, the pressure switch 600 has a case 680, metal fittings 610, 620, and 630, and a pressure chamber 640. A portion of the first metal fitting 610, a portion of the second metal fitting 620, the third metal fitting 630, and the pressure chamber 640 are housed within the case 680.

[0072] The first metal fitting 610 and the second metal fitting 620 are each fixed to the case 680. The first metal fitting 610 has a first terminal Ta, which is a portion exposed to the outside of the case 680. The second metal fitting 620 has a second terminal Tb, which is a portion exposed to the outside of the case 680.

[0073] The pressure chamber 640 has a diaphragm 644. A connecting pipe 642 is connected to the pressure chamber 640. A flexible tube 38 is connected to the connecting pipe 642. The diaphragm 644 is deformed in the first direction D1 by the pressure P. The amount of deformation of the diaphragm 644 increases as the pressure P increases.

[0074] The third fitting 630 is connected to the diaphragm 644. While in contact with the first fitting 610, the third fitting 630 is slidable parallel to the first direction D1 in accordance with the amount of deformation of the diaphragm 644. The third fitting 630 also has a contact point 632. The contact point 632 is located on the first direction D1 side of the second fitting 620.

[0075] When the pressure P is equal to or greater than the threshold value Pth (FIG. 7A), the amount of deformation of the diaphragm 644 is large. The third metal fitting 630 is positioned so that the contact 632 is separated from the second metal fitting 620 in the first direction D1. As a result, the path between the terminals Ta and Tb is cut off.

[0076] When the pressure P is less than the threshold value Pth (FIG. 7B), the amount of deformation of the diaphragm 644 is small. The third metal fitting 630 is positioned at a position where the contact 632 is in contact with the second metal fitting 620. As a result, the terminals Ta and Tb are connected.

[0077] The pressure threshold may be adjusted by any method, for example, by adjusting the stiffness (for example, thickness) of the diaphragm 644.

[0078] 6, within alarm device 200, the voltage line L, neutral line N, and ground line GND of first electrical cord 34 are connected to the voltage line L, neutral line N, and ground line GND of second electrical cord 36, respectively. The voltage line L and neutral line N of second electrical cord 36 provide power to gas output device 130 (FIG. 3).

[0079] Within the alarm device 200, the following circuit is formed between the voltage line L and the neutral line N. The first terminal T1 of the switch 700 is connected to the second terminal Tb of the pressure switch 600, the fifth terminal T5 of the switch 700, and the first terminal 991 of the lamp 990. The second terminal T2 is connected to the voltage line L. The third terminal T3 is connected to the first terminal Ta of the pressure switch 600. The fourth terminal T4 is connected to the first terminal 595 of the buzzer 500. The sixth terminal T6 is unused. The second terminal 596 of the buzzer 500 and the second terminal 992 of the lamp 990 are connected to the neutral line N.

[0080] A10. Operation Mode: Fig. 8 is a table showing the correspondence between the connection state of the switch 700, the operation mode of the alarm device 200, and the state of the alarm device 200. In this embodiment, the connection state of the switch 700 is selected from three connection states 701-703. The first connection state 701 corresponds to "test mode," the second connection state 702 corresponds to "run mode," and the third connection state 703 corresponds to "mute mode." The operator can select one of the three modes by operating the switch 700.

[0081] In the first connection state 701 (test mode), the first terminal T1 and the second terminal T2 are connected, and the fourth terminal T4 and the fifth terminal T5 are connected. The voltage line L ( FIG. 6 ) is connected to the first terminal 991 of the lamp 990 via the terminals T1 and T2. The voltage line L is also connected to the first terminal 595 of the buzzer 500 via the terminals T1, T2, T5, and T4. Therefore, the buzzer 500 and the lamp 990 operate regardless of the pressure P. The test mode is a mode for testing the buzzer 500 and the lamp 990.

[0082] In the second connection state 702 (run mode), the second terminal T2 and the third terminal T3 are connected, and the fourth terminal T4 and the fifth terminal T5 are connected. When the pressure P is equal to or greater than the threshold value Pth, the pressure switch 600 (FIG. 6) disconnects the path between the terminals Ta and Tb. The voltage line L is disconnected from the buzzer 500 and the lamp 990. Therefore, the buzzer 500 and the lamp 990 do not operate. When the pressure P is less than the threshold value Pth, the pressure switch 600 connects the terminals Ta and Tb. The voltage line L is connected to the first terminal 991 of the lamp 990 via the terminals T2, T3, Ta, and Tb. The voltage line L is also connected to the first terminal 595 of the buzzer 500 via the terminals T2, T3, Ta, Tb, T5, and T4. Therefore, the buzzer 500 and the lamp 990 operate. In this way, the pressure switch 600 changes the state of the buzzer 500 and the state of the lamp 990 between off (stopped state) and on (operated state) according to the pressure P. The run mode is a mode for notifying of malfunctions by both sound and light.

[0083] In the third connection state 703 (mute mode), the second terminal T2 and the third terminal T3 are connected, and the fifth terminal T5 and the sixth terminal T6 are connected. When the pressure P is equal to or greater than the threshold Pth, the pressure switch 600 ( FIG. 6 ) disconnects the path between the terminals Ta and Tb. The voltage line L is disconnected from the buzzer 500 and the lamp 990. Therefore, the buzzer 500 and the lamp 990 do not operate. When the pressure P is less than the threshold Pth, the pressure switch 600 connects the terminals Ta and Tb. The voltage line L is connected to the first terminal 991 of the lamp 990 via the terminals T2, T3, Ta, and Tb. However, the voltage line L is disconnected from the buzzer 500. Therefore, the buzzer 500 does not operate, but the lamp 990 does operate. The mute mode is a mode for alerting a malfunction using light rather than sound.

[0084] The three operating modes are used, for example, as follows. During normal operation of the wastewater treatment system 10 ( FIG. 1 ), the operating mode is set to the “run mode.” When there is no problem with the air supply from the blower 30, the pressure P is equal to or greater than the threshold value Pth, and the buzzer 500 and the lamp 990 do not operate. When there is a problem with the air supply, the pressure P drops below the threshold value Pth. The buzzer 500 and the lamp 990 then operate. Although not shown, the pump 100 ( FIG. 3 ) has a switch that cuts off the power supply to the gas output device 130 in response to damage to one or both of the diaphragms 133d and 134d (such a switch is also called an auto-stopper). When one or both of the diaphragms 133d and 134d are damaged, the auto-stopper cuts off the power supply, causing the gas output device 130 to stop. As a result, the pressure P drops below the threshold value Pth. The auto-stopper may have any configuration. When one or both of the diaphragms 133d, 134d are damaged, the vibrator 132 vibrates with a larger amplitude than when both the diaphragms 133d, 134d are not damaged. The auto-stopper is configured to interrupt the connection between the gas output device 130 and one or both of the voltage line L and neutral line N of the second electric cord 36 ( FIG. 6 ) by coming into contact with the vibrator 132 vibrating with a larger amplitude. Note that the auto-stopper may be omitted. In this case, gas leakage from the damaged portions of the diaphragms 133d, 134d may cause the pressure P to drop below the threshold value Pth.

[0085] An operator managing the wastewater treatment system 10 can easily notice the malfunction by one or both of the light and the buzzer sound. The operator performs work to resolve the malfunction (for example, repairing the connecting pipe 40 or replacing the damaged diaphragm (one or both of the diaphragms 133d and 134d (FIG. 3))). At this point, the operator may change the operation mode of the alarm device 200 to "mute mode." This allows the operator to proceed with the work in an environment without the buzzer sound. In this case, the operator can also confirm that the malfunction has been resolved by checking that the lamp 990 has gone out. After the malfunction has been resolved, the operator returns the operation mode of the alarm device 200 to "run mode."

[0086] A11. Manufacturing Method: Figure 9 is a flowchart showing an example of a manufacturing method for the blower 30. In S110, the pump 100 is manufactured. The manufacturing method for the pump 100 may be any method. As described above, in this embodiment, the configuration of the pump 100 is the same as that of a known blower without an alarm device, except that the flexible tube 38 is connected to the tank 135. Therefore, the pump 100 may be manufactured by the same method as that of a known blower.

[0087] In S120, multiple components of the alarm device 200 are prepared. The multiple components may be prepared by any method. For example, the buzzer 500 is prepared by purchasing a buzzer manufactured by a component manufacturer on the market. Similarly, the pressure switch 600, the switch 700, the electrical cords 34 and 36, the flexible tube 38, and the screws 313, 329, 359, and 910 are also prepared by purchasing them on the market. The first cover portion 300 is manufactured by molding (e.g., injection molding, blow molding, etc.) using a mold. The second cover portion 400 is manufactured by forging a metal plate, for example.

[0088] In S130, the lamp 990, the buzzer 500, the pressure switch 600, the switch 700, and the screw 313 forming the second striking portion 315 are fixed to the first cover part 300. As described above, the lamp 990 is fixed using a fixing nut. As shown in FIGS. 4(A) and 4(B), the buzzer 500 is fixed using a screw 329, and the pressure switch 600 is fixed using a screw 359. As described above, the switch 700 is fixed using a fixing nut.

[0089] In S140, the flexible tube 38 is connected to the pressure switch 600. Wiring is also performed to form the electrical circuit shown in FIG. 6 . For example, the voltage wire L of the first electrical cord 34, the voltage wire L of the second electrical cord 36, and the second terminal T2 of the switch 700 are connected. The multiple components (e.g., terminals and wires) may be connected by any method (e.g., by using connecting parts such as plug-in connection terminals or screws, soldering, welding, etc.).

[0090] In S150, the second cover part 400 is fixed to the first cover part 300 (FIG. 3). In S160, the alarm device 200 is fixed to the pump 100. In this way, the blower 30 is manufactured.

[0091] The connection of the second electric cord 36 to the pump 100 and the connection of the flexible tube 38 to the pump 100 may be performed at any timing (for example, at any of S110, S140, and S160). The manufacture of the pump 100 and the manufacture of the alarm device 200 may be performed independently. For example, the manufacture of the pump 100 may be performed after the manufacture of the alarm device 200.

[0092] As described above, in this embodiment, blower 30 (FIG. 3) includes pump 100 configured to output air and alarm device 200 fixed to pump 100. Alarm device 200 includes buzzer 500, lamp 990, pressure switch 600, and cover 210 fixed to pump 100. As described in FIG. 8, pressure switch 600 is an example of a control unit configured to control buzzer 500 and lamp 990 in accordance with pressure P of gas output by pump 100.

[0093] As described with reference to FIG. 3 , the cover 210 is composed of multiple parts, including the first cover portion 300 and the second cover portion 400. The cover 210 has inner surfaces 380, 480, and defines an internal space 389 surrounded by the inner surfaces 380, 480. The cover 210 accommodates the buzzer 500 and the pressure switch 600 within the internal space 389. The buzzer 500, the lamp 990, and the pressure switch 600 are fixed to the first cover portion 300. Therefore, in S130 of the manufacturing method of FIG. 9 , the buzzer 500, the lamp 990, and the pressure switch 600 are fixed to the same first cover portion 300. If the buzzer 500, the lamp 990, and the pressure switch 600 were distributed between the first cover portion 300 and the second cover portion 400, preparations would be required for both the work of fastening the components to the first cover portion 300 and the work of fastening the components to the second cover portion 400 (e.g., a manufacturing line and tools would be prepared for both work). Compared to this case, the present embodiment reduces the complexity of manufacturing the blower 30 equipped with the alarm device 200. Furthermore, in S140, the first cover portion 300 and the second cover portion 400 are not connected by wiring. If wiring were to connect the first cover portion 300 and the second cover portion 400, the second cover portion 400 connected to the first cover portion 300 could interfere with the tightening of the screws on the first cover portion 300. This problem is avoided in the present embodiment. Thus, the complexity of manufacturing the blower 30 is reduced.

[0094] As shown in Figures 5A and 5B, the buzzer 500 includes a vibrator 580, a coil 570, and a first striking portion 519 configured to be repeatedly struck by the vibrating vibrator 580 to generate a first buzzer sound. The coil 570 is an example of a drive device configured to vibrate the vibrator 580. As shown in Figures 5C and 5D, the alarm device 200 includes a second striking portion 315 configured to be repeatedly struck by the vibrating buzzer 500 (in this embodiment, the protrusion 512) to generate a second buzzer sound when the coil 570 vibrates the vibrator 580. Therefore, the alarm device 200 can generate a loud sound including the first buzzer sound and the second buzzer sound.

[0095] 5(C) and 5(D), the alarm device 200 has a protrusion 310 that protrudes toward the buzzer 500. The protrusion 310 protrudes from the inner surface 380 of the cover 210 (here, the first cover part 300). The end of the protrusion 310 forms the second striking portion 315. Therefore, the second striking portion 315 can be easily formed. For example, the second striking portion 315 can be easily formed using a sound boss 311 and a screw 313.

[0096] Furthermore, the second striking portion 315 may be deformed by being struck by the buzzer 500. In this embodiment, the end of the protruding portion 310 forms the second striking portion 315. Therefore, even after the second striking portion 315 is deformed, the buzzer 500 strikes the end of the protruding portion 310 in the same manner as before the second striking portion 315 is deformed. Therefore, changes in the second buzzer sound caused by the deformation of the second striking portion 315 are reduced. For example, the possibility of the volume of the second buzzer sound becoming lower is reduced.

[0097] The second striking portion 315 is the top surface 315 of the screw 313 and is formed by the screw 313. The screw 313 is an example of a first forming portion that forms the second striking portion 315 (the screw 313 is also referred to as the first forming portion 313). The first forming portion 313 is a separate member from the first cover portion 300 (and therefore the cover 210). As shown in FIG. 4(F) , the first forming portion 313 is fixed to the first cover portion 300. Therefore, if the second striking portion 315 is damaged by repeated striking, the first forming portion 313 can be replaced without replacing the cover 210.

[0098] As shown in FIG. 5C and other figures, the cover 210 (here, the first cover portion 300) has a sound boss 311 that forms a screw hole 312. The screw hole 312 is an example of a recess provided on the interior space 389 side of the cover 210 (hereinafter, the screw hole 312 will also be referred to as a recess 312, and the sound boss 311 will also be referred to as a recess-forming portion 311). The screw 313 includes a first portion 316 located within the screw hole 312 and a second portion 317 exposed to the interior space 389. The second portion 317 forms a top surface 315 (i.e., a second striking portion 315). In this embodiment, the second striking portion 315 is formed by the simple operation of threading the screw 313 into the screw hole 312. This reduces the complexity of manufacturing the blower 30.

[0099] Furthermore, the recess 312 is not a through-hole but has a bottom. If a screw 313 were to be threaded into a hole penetrating the side wall 370, rainwater could enter the internal space 389 through a gap between the through-hole and the screw 313. In this embodiment, such a problem is avoided.

[0100] The second striking portion 315 is the top surface 315 and includes a flat outer surface. As shown in FIGS. 5(C) and 5(D), the buzzer 500 and the second striking portion 315 are arranged so that the buzzer 500 (here, the protrusion 512) strikes the flat outer surface of the second striking portion 315. The contact position between the second striking portion 315 and the protrusion 512 may change between multiple strikes. The change in contact position may be caused by various factors, such as deformation of the second striking portion 315 and a change in the position of the buzzer 500 relative to the first cover part 300 (e.g., rotation around the through-hole 514). The contact position may change randomly. When the protrusion 512 strikes the second striking portion 315, the protrusion 512 receives a force from the second striking portion 315. If the curved outer surface is struck by the protrusion 512, the contact position will change randomly, and the direction of the force that the protrusion 512 receives from the curved outer surface will also change randomly. The randomly changing force may cause a large change in the position of the buzzer 500 relative to the first cover part 300. In this embodiment, the flat top surface 315 is struck by the protrusion 512 of the buzzer 500, so the change in the position of the buzzer 500 is reduced.

[0101] Furthermore, during the manufacturing of the blower 30 ( FIG. 9 ), the buzzer 500 is fixed to the first cover part 300 ( S130 ) with the protrusion 512 of the buzzer 500 ( FIG. 5A ) in contact with the flat second striking portion 315 of the screw 313. The contact position of the protrusion 512 on the second striking portion 315 may vary randomly during multiple manufacturing runs of multiple blowers 30 . When the screw 329 is tightened to fix the buzzer 500, the protrusion 512 receives a force from the second striking portion 315. If the protrusion 512 contacts a curved outer surface, the contact position may vary randomly, and therefore the direction of the force that the protrusion 512 receives from the curved outer surface may also vary randomly. The randomly varying force may cause a random deviation in the position of the buzzer 500 relative to the first cover part 300. In this embodiment, the protrusion 512 of the buzzer 500 contacts the flat second striking portion 315, so that the variation in the position of the buzzer 500 among the plurality of blowers 30 is reduced.

[0102] As shown in FIG. 4(D), the buzzer 500 has a base member 510 having a through-hole 514. As shown in FIGS. 4(D) and 4(E), the alarm device 200 has a screw 329. The screw 329 passes through the through-hole 514 to fix the buzzer 500 to the cover 210 (here, the first cover portion 300) (the screw 329 is also referred to as a fixing portion 329). In this embodiment, the screw 329 is fixed to the first cover portion 300 (specifically, the first fixing boss 321) while passing through the through-hole 514. The outer diameter of the screw head of the screw 329 is larger than the inner diameter of the through-hole 514. As shown in FIGS. 4(B), 4(D), and 4(E), the alarm device 200 has a wall portion 330 and a boss 340. In this embodiment, the wall portion 330 and the boss 340 are part of the first cover portion 300. As described above, wall 330 and boss 340 limit the rotational position of buzzer 500 around through-hole 514 by contacting buzzer 500 (hereinafter, wall 330 will also be referred to as first position limiter 330, and boss 340 will also be referred to as second position limiter 340). Therefore, deviation in the rotational position of buzzer 500 is reduced.

[0103] Furthermore, the first position limiter 330 contacts the base member 510 of the buzzer 500, thereby limiting the rotational position of the buzzer 500. Here, the base member 510 is a member having a through-hole 514 for fixing the buzzer 500. Compared to when the first position limiter 330 contacts another member of the buzzer 500, the first position limiter 330 can appropriately limit the rotational position of the buzzer 500.

[0104] As shown in FIG. 3 , the cover 210 (here, the first cover portion 300) has a lower wall portion 309, which is the lower wall portion of the alarm device 200. The lower wall portion 309 has a through-hole 305. The through-hole 305 can guide the buzzer sound generated inside the cover 210 from inside the cover 210 to the outside. Therefore, the alarm device 200 can output a loud sound. Furthermore, compared to when the through-hole 305 is formed in the upper wall portion 308 on the upper Z side of the cover 210 or in a wall portion on a lateral side, the possibility of rainwater entering the cover 210 through the through-hole is reduced.

[0105] B. Second Embodiment: FIG. 10 is a schematic diagram of an alarm device according to another embodiment. Similar to FIG. 5(C), the figure shows a cross section perpendicular to the second direction Y of a portion of the alarm device 200b, including a portion of the first cover portion 300b and a portion of the buzzer 500. This embodiment differs from the embodiment shown in FIG. 5(C) in the following three respects. The first difference is that the outer diameter of the sound boss 311b is larger than the outer diameter of the sound boss 311 in FIG. 5(C). The second difference is that a disk-shaped washer 318 is disposed on the end face of the sound boss 311b on the +X direction side, and a screw 313 secures the washer 318 to the sound boss 311b. The third difference is that the protrusion 512 of the buzzer 500 contacts the flat outer surface 319 on the +X direction side of the washer 318, instead of the top surface 315 of the screw 313. The configuration of other parts of the alarm device 200b of this embodiment is the same as the configuration of the corresponding parts of the alarm device 200 described above. The alarm device 200b is formed by using a first cover part 300b instead of the first cover part 300 (FIG. 3). The alarm device 200b has a cover 210b (FIG. 10) composed of the first cover part 300b and a second cover part 400 (FIG. 3). The cover 210b forms an internal space 389b surrounded by inner surfaces 380b, 480. The alarm device 200b is fixed to the pump 100 instead of the alarm device 200 (FIG. 3) of the first embodiment. The manufacturing method of the blower including the pump 100 and the alarm device 200b is the same as the manufacturing method of the first embodiment (FIG. 9).

[0106] When the buzzer 500 operates, the protrusion 512 of the buzzer 500 repeatedly strikes the flat outer surface 319 of the washer 318, thereby generating a second buzzer sound. Hereinafter, the outer surface 319 of the washer 318 is also referred to as the second striking portion 319. In this embodiment, because the flat outer surface 319 is struck by the protrusion 512 of the buzzer 500, changes in the position of the buzzer 500 are reduced, as in the first embodiment.

[0107] The washer 318 is fixed to the sound boss 311b by the screw 313. The screw 313 and the washer 318 as a whole are an example of a first forming portion that forms the second striking portion 319. Hereinafter, the screw 313 and the washer 318 as a whole will also be referred to as the first forming portion 320b. The first forming portion 320b is composed of the screw 313 and the washer 318, which are separate members from the cover 210b. Therefore, if the second striking portion 319 is damaged by repeated striking, the washer 318, and therefore the first forming portion 320b, can be replaced without replacing the cover 210b.

[0108] The first cover part 300b has a sound boss 311b that forms a screw hole 312. This screw hole 312 is an example of a recess provided on the internal space 389b side (hereinafter, the sound boss 311b will also be referred to as a recess forming part 311b). A first part 316 of the screw 313 is located within the screw hole 312. A screw head 314 and a washer 318 of the screw 313 are exposed to the internal space 389b (hereinafter, the entire screw head 314 and washer 318 will also be referred to as a second part 322b). In this way, the first forming part 320b includes the first part 316 located within the screw hole 312 and the second part 322b exposed to the internal space 389b. The second part 322b forms a second striking part 319. In this embodiment, the second striking portion 319 is formed by the simple operation of screwing the screw 313 that passes through the washer 318 into the screw hole 312. Therefore, the complexity of manufacturing the blower having the alarm device 200b is reduced.

[0109] The sound boss 311b, the screw 313, and the washer 318 together form a protrusion 310b that protrudes toward the buzzer 500. The protrusion 310b protrudes from the inner surface 380b of the first cover portion 300b. The washer 318 is provided at the end of the protrusion 310b. That is, the end of the protrusion 310b forms the second striking portion 319. Therefore, the second striking portion 319 can be easily formed. For example, the second striking portion 319 can be easily formed using the sound boss 311b, the screw 313, and the washer 318. Furthermore, changes in the second buzzer sound caused by deformation of the second striking portion 319 are reduced.

[0110] Other than the above-mentioned differences, the configuration of the alarm device 200b is the same as the corresponding configuration of the alarm device 200 of the first embodiment. Therefore, a blower equipped with the alarm device 200b of this embodiment has various advantages similar to the blower 30 of the first embodiment. For example, the buzzer 500 (FIG. 3), lamp 990, and pressure switch 600 are fixed to the first cover portion 300b. Therefore, the manufacturing complexity of the blower 30 equipped with the alarm device 200b is reduced.

[0111] C. Third Embodiment: FIG. 11(A) is a schematic diagram of an alarm device according to another embodiment. Similar to FIG. 5(C), the figure shows a cross section perpendicular to the second direction Y of a portion of the alarm device 200c, including a portion of the first cover portion 300c and a portion of the buzzer 500. This embodiment differs from the embodiment shown in FIG. 5(C) in the following two respects. The first difference is that the thickness of the side wall portion 370c, which is the wall portion on the −X direction side of the first cover portion 300c, is thicker than the thickness of the side wall portion 370. The second difference is that the sound boss 311 and the first fixing boss 321 are omitted, and screw holes 312 and 322 are formed in the side wall portion 370c. The configuration of the other parts of the alarm device 200c according to this embodiment is the same as the configuration of the corresponding parts of the alarm device 200 described above. The alarm device 200c is formed by using the first cover portion 300c instead of the first cover portion 300 (FIG. 3). The alarm device 200c has a cover 210c (FIG. 11(A)) made up of a first cover portion 300c and a second cover portion 400 (FIG. 3). The cover 210c defines an internal space 389c surrounded by inner surfaces 380c, 480. The alarm device 200c is fixed to the pump 100 in place of the alarm device 200 of the first embodiment (FIG. 3). The manufacturing method for the blower having the pump 100 and the alarm device 200c is the same as the manufacturing method for the first embodiment (FIG. 9).

[0112] In this embodiment, the buzzer 500 is fixed to the first cover part 300c by a single screw 329. The screw 329 passes through the through-hole 514 of the first part 511 of the buzzer 500 and is screwed into the screw hole 322. The outer diameter of the screw head of the screw 329 is larger than the inner diameter of the through-hole 514.

[0113] When the buzzer 500 is fixed to the first cover part 300c, the protrusion 512 of the buzzer 500 contacts the flat top surface 315 of the screw head 314 of the screw 313. The screw 313 is threaded into the screw hole 312. The top surface 315 of the screw 313 is exposed to the internal space 389c. Note that, unlike the embodiments of FIGS. 5(C) and 5(D), the bosses 311 and 321 are omitted. Therefore, when the buzzer 500 is fixed to the first cover part 300c, the first base part 513 can bend.

[0114] When the buzzer 500 operates, the protrusion 512 of the buzzer 500 repeatedly strikes the top surface 315 of the screw 313, as in the embodiments of FIGS. 5C and 5D. This generates a second buzzer sound. In this embodiment, the top surface 315 is an example of a second striking portion that repeatedly strikes the buzzer 500 (the top surface 315 is also referred to as the second striking portion 315). The screw 313 is an example of a first forming portion that forms the second striking portion 315 (the screw 313 is also referred to as the first forming portion 313). The first forming portion 313 is a separate member from the cover 210c. Therefore, if the second striking portion 315 is damaged by repeated striking, the first forming portion 313 can be replaced without replacing the cover 210c.

[0115] The first cover part 300c has a sidewall part 370c that forms a screw hole 312. This screw hole 312 is an example of a recess provided on the internal space 389c side of the first cover part 300c (hereinafter, the screw hole 312 will also be referred to as a recess 312, and the sidewall part 370c will also be referred to as a recess-forming part 370c). In this embodiment, a top surface 315 of the screw 313 is exposed to the internal space 389c, and the other portion of the screw 313 is located within the screw hole 312. The portion of the screw 313 that is exposed to the internal space 389c forms the top surface 315 (i.e., the second striking part 315). In this embodiment, the second striking part 315 is formed by the simple operation of screwing the screw 313 into the screw hole 312. This reduces the complexity of manufacturing the blower 30.

[0116] FIG. 11B is a schematic diagram showing the configuration inside the recess 387c of the first cover part 300c. Similar to FIG. 4B, this figure shows the first cover part 300c viewed in the -X direction. Position limiters 330 and 340 are formed on the side wall 370c of the first cover part 300c. The configurations of the position limiters 330 and 340 are the same as those of the position limiters 330 and 340 described in FIGS. 4B, 4D, and 4E, respectively. In this embodiment, as in the embodiments of FIGS. 4B, 4D, and 4E, the position limiters 330 and 340 limit the rotational position of the buzzer 500 around the through-hole 514 by contacting the buzzer 500.

[0117] 4(E), the present embodiment does not include the first fixed boss 321. Therefore, the height of the wall portion 330 in the present embodiment may be lower than the height of the wall portion 330 in FIG.

[0118] Other than the above differences, the configuration of the alarm device 200c is the same as the corresponding configuration of the alarm device 200 of the first embodiment. Therefore, a blower equipped with the alarm device 200c of this embodiment has various advantages similar to the blower 30 of the first embodiment. For example, the buzzer 500 (FIG. 11B), pressure switch 600, and lamp 990 (FIG. 3) are fixed to the first cover portion 300c. Therefore, the manufacturing complexity of the blower 30 equipped with the alarm device 200c is reduced.

[0119] D. Fourth Embodiment: FIG. 12 is a schematic diagram of an alarm device according to another embodiment. Similar to FIG. 5(C), the figure shows a cross section perpendicular to the second direction Y of a portion of the alarm device 200d, including a portion of the first cover portion 300d and a portion of the buzzer 500. This embodiment differs from the embodiment shown in FIG. 5(C) in the following two respects. The first difference is that the side wall portion 370d has a first protrusion 311d protruding outward from the side wall portion 370d, instead of the sound boss 311. The first protrusion 311d has a screw hole 312 formed therein. The second difference is that the side wall portion 370d has a second protrusion 321d protruding outward from the side wall portion 370d, instead of the first fixing boss 321. The second protrusion 321d has a screw hole 322 formed therein.

[0120] The configuration of inner surface 380d of side wall portion 370d is the same as the configuration of inner surface 380c of side wall portion 370c in Fig. 11(A). The configuration for fixing buzzer 500 to first cover portion 300d is the same as the configuration for fixing buzzer 500 to first cover portion 300c in Fig. 11(A). The operation of buzzer 500 is the same as the operation of buzzer 500 in Fig. 11(A).

[0121] The configuration of other parts of the alarm device 200d of this embodiment is the same as the configuration of the corresponding parts of the alarm device 200 described above. The alarm device 200d is formed by using a first cover part 300d instead of the first cover part 300 (FIG. 3). The alarm device 200d has a cover 210d composed of a first cover part 300d and a second cover part 400 (FIG. 3). The cover 210d forms an internal space 389d surrounded by inner surfaces 380d and 480. The screw hole 312 is an example of a recess provided on the internal space 389d side of the cover 210d. The first protrusion 311d is an example of a recess-forming part (also referred to as recess-forming part 311d) that forms the screw hole 312 (i.e., the recess). The top surface 315 of the screw 313 is exposed to the internal space 389d, and the other part of the screw 313 is located within the screw hole 312. The portion of the screw 313 exposed to the internal space 389d forms a top surface 315 (i.e., a second striking portion 315). The alarm device 200d is fixed to the pump 100 in place of the alarm device 200 of the first embodiment (FIG. 3). The manufacturing method of the blower having the pump 100 and the alarm device 200d is the same as the manufacturing method of the first embodiment (FIG. 9).

[0122] E. Modifications: (1) The buzzer may have any configuration including a vibrator, a drive unit configured to vibrate the vibrator, and a first striking portion configured to be repeatedly struck by the vibrating vibrator to generate the first buzzer sound. For example, the drive unit may be an electric motor or a piezoelectric element. The vibrator may have any configuration capable of vibrating. For example, the vibrator may be a rod having a fixed end and a free end. The free end of the rod is vibrable. The vibrator may also be a membrane. The first striking portion may have any configuration capable of being struck by the vibrator. For example, the first striking portion may be a protrusion that protrudes toward the vibrator. The end of the protrusion may be struck by the vibrator. The configuration for supporting the vibrator, the drive unit, and the first striking portion is not limited to the configuration including the base member 510 of FIG. 5(A), and may have any configuration. For example, the buzzer case may support the vibrator, the drive unit, and the first striking portion.

[0123] (2) The configuration for fixing the buzzer to the cover may be any configuration other than the configuration including the screw 329 and the screw hole 322 (e.g., FIG. 4E ). For example, a pin without a male thread may be used instead of the screw 329, and a recess without a female thread may be used instead of the screw hole 322. The buzzer may be fixed to the cover by press-fitting the pin that passes through the through-hole of the buzzer (e.g., the through-hole 514 in FIG. 4D ) into the recess of the cover. The buzzer may have a protrusion, and the cover may form a recess. The buzzer may be fixed to the cover by press-fitting the protrusion of the buzzer into the recess of the cover. The buzzer may be fixed to the cover by adhesive. The cover may have a boss, and the buzzer may have a recess. The boss may be press-fitted into the recess of the buzzer, thereby fixing the buzzer to the cover.

[0124] (3) The configuration of the second striking portion struck by the buzzer is not limited to the top surface 315 of the screw 313 ( FIG. 5(C) ) or the outer surface 319 of the washer 318 ( FIG. 10 ), and may be any configuration. For example, the alarm device may have a protrusion that protrudes toward the buzzer, and the protrusion may form the second striking portion. Here, the protrusion may be molded integrally with the cover, or alternatively, may be composed of one or more members separate from the cover. The entire protrusion may be formed from a single member separate from the cover. For example, the protrusion may be a metal rod member. The method of fixing the protrusion to the cover may be any method. For example, the male thread of the protrusion may be screwed into a screw hole in the cover. Alternatively, the protrusion may be fixed to the cover with an adhesive. The second striking portion may be configured without using a protrusion.

[0125] The second striking portion may be formed integrally with the cover (i.e., the second striking portion may be part of the cover). Alternatively, the second striking portion may be formed by a first forming portion that is separate from the cover. The first forming portion may be composed of three or more members that are separate from the cover.

[0126] When the second striking portion is formed by the first forming portion, the first forming portion may be a type of screw other than a flat head screw. For example, the first forming portion may be a screw having a curved top surface.

[0127] When the second striking portion is formed by the first forming portion, the cover may have a recess forming portion that forms a recess provided on the interior space side of the cover. At least a portion of the first forming portion may be disposed within this recess. In this case, the recess forming portion is preferably formed from a resin. For example, one or more resins selected from polyethylene, polypropylene, polystyrene, polyvinyl chloride, ABS resin, AS resin, polyethylene terephthalate, methacrylic resin, polyamide, polycarbonate, and polybutylene terephthalate may be used. By using such a resin, the recess can be easily formed. The recess forming portion may be formed as a separate member from the cover, or may be part of the cover.

[0128] When the second striking portion is formed by the first forming portion, any method may be used to fix the first forming portion to the cover. For example, the first forming portion may be a pin without a male thread instead of the screw 313 ( FIG. 5C ). A recess without a female thread may be formed in the cover instead of the screw hole 322. The pin may then be press-fitted into the recess. Alternatively, the first forming portion may be fixed to the cover with an adhesive.

[0129] The second striking portion may include a curved outer surface, and the buzzer may strike the curved outer surface of the second striking portion.

[0130] In either case, the second striking portion is preferably formed of iron or an alloy containing iron (e.g., stainless steel, carbon steel, etc.). When the second striking portion is formed by the first forming portion, the member forming the second striking portion among the one or more members constituting the first forming portion is preferably formed of iron or an alloy containing iron. This configuration improves the durability of the second striking portion compared to when the second striking portion is formed of resin. Furthermore, the second striking portion can generate a louder second buzzer sound.

[0131] (4) The portion of the buzzer against which the second striking portion strikes is not limited to a protruding portion (e.g., protruding portion 512 in FIG. 5C ) and may be any portion. For example, the flat plate portion of first base portion 513 may strike the second striking portion.

[0132] (5) The position limiting unit that limits the rotational position of the buzzer around the buzzer through-hole (e.g., through-hole 514 in FIG. 4D ) may have any configuration that limits the rotational position by contacting the buzzer. For example, a boss that contacts end 513 a of first base portion 513 and a boss that contacts end 513 b may be provided separately. Alternatively, a screw threaded into the cover may limit the rotational position by contacting the buzzer. The position limiting unit may be omitted. For example, in each of the above embodiments, one or both of position limiting units 330 and 340 ( FIG. 4A ) may be omitted.

[0133] (6) The control unit for controlling the buzzer and the lamp may be configured in any manner to control the buzzer and the lamp in response to the pressure P of the gas output by the pump. For example, a pressure switch 600 ( FIG. 6 ) may connect terminals Ta and Tb when the pressure P is equal to or greater than a threshold value Pth, and disconnect the path between terminals Ta and Tb when the pressure P is less than the threshold value Pth. In this case, the electrical circuit ( FIG. 6 ) is modified to suit the operation of the pressure switch 600. The pressure switch may also include a cylinder connected to the flexible tube 38, a piston disposed within the cylinder, a spring that applies force to the piston, and a connecting fitting connected to the piston. When the pressure P is less than the threshold value Pth, the piston is pushed by the spring and moves, and the connecting fitting connects terminals Ta and Tb. When the pressure P is equal to or greater than the threshold value Pth, air moves the piston in the opposite direction, and the connecting fitting separates from terminals Ta and Tb. In this way, the pressure switch may have a first member (such as a piston or diaphragm 644 (FIG. 7A)) that moves or deforms in response to pressure P, and a second member (such as a connecting metal fitting or third metal fitting 630 (FIG. 7A)) that is moved by the first member to change the connection state between multiple terminals.

[0134] The control unit may also have a pressure sensor that measures the pressure P and an electric circuit that controls the buzzer and the lamp using a signal from the pressure sensor. The pressure sensor may be any of a variety of sensors, such as a sensor that includes a piezoelectric element that deforms in response to the pressure P.

[0135] In this way, the control unit may have a pressure switch that operates in response to pressure, or a pressure sensor that measures pressure. In either case, it is preferable that the control unit sets the buzzer and the lamp to a stopped state when the pressure P is equal to or greater than a predetermined threshold value Pth, and sets the buzzer and the lamp to an operating state when the pressure P is less than the threshold value Pth.

[0136] (7) The cover of the alarm device may be configured in any manner that covers at least a portion of the periphery of the alarm device. The first cover portions 300, 300b, 300c, and 300d may be formed from various resins, similar to the recessed portions described above. The first cover portions 300, 300b, 300c, and 300d may be formed from metal instead of resin. The second cover portion 400 may be formed from resin instead of metal. The cover may be composed of three or more portions. The through-hole 305 ( FIG. 3 ) may be omitted from the first cover portions 300, 300b, 300c, and 300d.

[0137] The electrical circuit of the alarm device may be waterproofed. In this case, the cover may only cover a portion of the periphery of the alarm device. For example, in each of the above embodiments, the second cover part 400 may be omitted, and the first cover parts 300, 300b, 300c, and 300d may be fixed to the pump 100. Furthermore, a through-hole 305 may be formed in the upper wall part 308 or the side wall of the cover.

[0138] (8) The alarm device may have various configurations for notifying of gas supply malfunctions. The electrical circuit configuration may be various other configurations instead of the configuration shown in FIG. 6 . For example, the electrical plug 32, the electrical cords 34 and 36, and the pump 100 may be configured to use other types of power sources (e.g., three-phase power sources, DC power sources, etc.) instead of a single-phase AC power source. The alarm device may have one or more operating modes, including a mode that allows a buzzer to notify of malfunctions (e.g., the run mode shown in FIG. 8 ). One or both of the test mode and the mute mode may be omitted. If only one operating mode is available, the switch 700 may be omitted. The lamp 990 ( FIG. 2(A) ) may be omitted.

[0139] (9) The pump may have any configuration for outputting a gas containing oxygen. For example, the pump may have any device for suctioning, compressing, and outputting a gas. Such a device may include, for example, a device having a cylinder and a piston, or a device having a cylinder and a rotor. The gas output by the pump may be any gas containing oxygen. For example, the pump may output oxygen gas supplied from an oxygen tank. In either case, a control unit such as the pressure switch 600 is preferably connected to a tube (e.g., flexible tube 38 ( FIG. 3 )) that communicates with the pump's outlet. The tube connected to the control unit may communicate with the outlet 190 inside the pump 100, as in the embodiment of FIG. 3 . Alternatively, the tube connected to the control unit may communicate with the outlet outside the pump.

[0140] (10) The wastewater treatment device may be configured in any manner, including a device that operates using a gas containing oxygen. The blower supplies the gas to such a device.

[0141] The present invention has been described above based on examples and modifications, but the above-described embodiments of the invention are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit of the invention, and equivalents thereof are also included within the scope of the present invention.

[0142] The present invention can be suitably used in a blower.

[0143] 10...wastewater treatment system, 20...wastewater treatment device, 30...blower, 32...electrical plug, 34...first electrical cord, 36...second electrical cord, 38...flexible tube, 40...connecting pipe, 90...ground, 100...pump, 110...case, 120...cover, 130...gas output device, 131...solenoid, 132...vibrator, 133, 134...pressure chamber, 133d, 134d...diaphragm, 133i, 134i...intake valve, 133o, 134o...discharge valve, 135...tank, 139...intake port, 180...connection port, 190...discharge port, 200, 200b, 200c, 200d...alarm device, 2 10, 210b, 210c, 210d... Cover, 300, 300b, 300c, 300d... First cover part, 308... Upper wall part, 309... Lower wall part, 311d... First protrusion part (recess forming part), 321d... Second protrusion part, 370, 370d... Side wall part, 370c... Side wall part (recess forming part), 301... First through hole, 302... Second through hole, 303... Third through hole, 304... Fourth through hole, 305... Through hole, 306... Through hole, 310, 310b... Protrusion part, 311... Sound boss (recess forming part), 311b... Sound boss (recess forming part), 312... Screw hole (recess), 313... Screw (first forming part), 3 14...Screw head, 315...Top surface (second striking portion), 316...First portion, 317...Second portion, 318...Washer, 319...Outer surface (second striking portion), 320b...First forming portion, 321...First fixing boss, 322...Screw hole, 322b...Second portion, 329...Screw (fixing portion), 330...Wall portion (first position limiting portion), 339...Plate portion, 340...Boss (second position limiting portion), 351...Second fixing boss, 352...Screw hole, 359...Screw, 360...Wall portion, 370...Wall portion, 380, 380b, 380c, 380d...Inner surface, 387, 387c...Recess, 388...Opening, 389, 389b, 389c, 389d ...internal space, 391...third fixing boss, 392...screw hole, 400...second cover portion, 410...plate portion, 420...leg portion, 421...first portion, 422...second portion, 423...through hole, 480...inner surface, 490...through hole, 500...buzzer, 510...base member, 511...end portion (first portion), 512...protrusion, 513...first base portion, 514...through hole, 517...second base portion, 518...through hole, 519...first striking portion (third base portion), 560...plate spring, 570...coil, 580...vibrator, 581...first portion, 582...second portion, 590...case, 595...first terminal,596...second terminal, 600...pressure switch, 610...first metal fitting, 620...second metal fitting, 630...third metal fitting, 632...contact, 640...pressure chamber, 642...connecting pipe, 644...diaphragm, 680...case, 690...protrusion, 692...through hole, 700...switch, 701...first connection state, 702...second connection state, 703...third connection state, 910, 920...screw, 990...lamp, 991...first terminal, 992...second terminal, L...voltage line, N...neutral line, GND...grounding line, T1-T6, Ta, Tb...terminal, P...pressure, Pth...threshold value,

Claims

1. A blower for a wastewater treatment device, a pump configured to output a gas comprising oxygen; an alarm device fixed to the pump; Equipped with The alarm device Buzzer and Lamp and a control unit configured to control the buzzer and the lamp in response to a pressure of the gas output by the pump; a cover fixed to the pump; and the cover has an inner surface and defines an interior space surrounded by the inner surface; the cover accommodates the buzzer and the control unit in the internal space; The cover is composed of a plurality of parts including a first cover part and a second cover part, The buzzer, the lamp, and the control unit are fixed to the first cover portion. Blower.

2. 2. The blower of claim 1, The buzzer A vibrator and a driver configured to vibrate the vibrator; a first striking portion configured to be repeatedly struck by a vibrating vibrator to generate a first buzzer sound; and The alarm device has a second striking portion configured to be repeatedly struck by a vibrating buzzer to generate a second buzzer sound when the drive device vibrates the vibrator. Blower.

3. 3. The blower of claim 2, the alarm device has a protrusion that protrudes toward the buzzer, An end of the protrusion forms the second striking portion. Blower.

4. 4. The blower according to claim 2 or 3, the alarm device has a first forming portion that forms the second striking portion, the first forming portion is configured with one or more members separate from the cover, The first forming portion is fixed to the cover. Blower.

5. 5. The blower of claim 4, the cover has a recess forming portion that forms a recess provided on the interior space side of the cover, the first forming portion includes a first portion located within the recess and a second portion exposed to the internal space, The second portion forms the second striking portion. Blower.

6. 4. The blower according to claim 2 or 3, the second striking portion includes a flat outer surface; The buzzer and the second striking portion are arranged so that the buzzer strikes the flat outer surface of the second striking portion. Blower.

7. 4. A blower according to claim 1, the buzzer has a first member having a through hole; The alarm device a fixing portion that passes through the through hole of the first member to fix the buzzer to the cover; a position limiting portion that limits a rotational position of the buzzer around the through hole by contacting the buzzer; A blower having:

8. 8. The blower of claim 7, the position limiting portion limits the rotational position of the buzzer by contacting the first member of the buzzer. Blower.

9. 4. A blower according to claim 1, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.

10. The blower of claim 4, the buzzer has a first member having a through hole; The alarm device a fixing portion that passes through the through hole of the first member to fix the buzzer to the cover; a position limiting portion that limits a rotational position of the buzzer around the through hole by contacting the buzzer; A blower having:

11. The blower of claim 5, the buzzer has a first member having a through hole; The alarm device a fixing portion that passes through the through hole of the first member to fix the buzzer to the cover; a position limiting portion that limits a rotational position of the buzzer around the through hole by contacting the buzzer; A blower having:

12. The blower of claim 4, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.

13. The blower of claim 5, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.

14. The blower of claim 7, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.

15. The blower of claim 10, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.

16. The blower of claim 11, the cover has a lower wall portion that is a wall portion on the lower side of the alarm device, The lower wall portion has a through hole. Blower.