JP2001193663A - Air pump and sewage purifying chamber using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a person in management to quickly sense the occurrence that coil severance is generated in an electromagnetic device which operates a passage changeover valve of an air pump. SOLUTION: The air pump is equipped with branching ports 10 and 11 to branch the air passage from the body of air pump to a plurality of segments, air discharge ports A and B in communication with the branching ports 10 and 11, a passage selector valve 14 to switch the air passage at the ports 10 and 11, an electromagnetic device 19 to operate the selector valve 14, and a current opening/closing device 2 to turn on and off the current to the device 19 on the basis of the instruction given by a control part 1, wherein parallel with the current opening/closing device 2, a circuit 4 is installed to feed a bypass current as large as not causing actuation of the electromagnetic device 19 when the current opening/closing device 2 is in the closed condition, and further a means to sense the bypass current is provided. The purifying chamber is structured so that the air discharge port of the air pump is coupled with the air passage to feed air into an aerobic treatment chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air pump and a sewage treatment tank provided with the air pump.

[0002]

2. Description of the Related Art FIG. 3A is a perspective view showing the appearance of a sewage treatment tank 27. The sewage flows from the inflow pipe 33 into the sewage purification tank 27, and the treated purified water is discharged from the discharge pipe 34. An air pump 26 is provided in the sewage purification tank 27, and air for promoting the decomposition of filth by microorganisms is supplied to the aerobic filter bed in the sewage purification tank 27 by the air pump 26. The air pump 26 usually has a plurality of outlets. For example, in the air pump 26 having two outlets A and B, air discharged from the outlet A is The air discharged from the outlet B is supplied into the tank via the air pipe 40.

FIG. 3 (b) is an enlarged perspective view of the air pump 26. A control device 23 for controlling the operation of the air pump 26 is provided in a recess provided in the cover casing 24, and controls a flow path switching valve provided inside the air pump 26 to discharge air from the discharge port A. Or, whether to discharge from the discharge port B is switched. Usually, the discharge direction is set so as to be switched at predetermined time intervals, and such control can be easily performed by microcomputer control having a timer function. The purpose of switching the discharge direction in this way is to remove the adhered solids by sending backwash air so as not to block the aerobic filter bed.

The operation of the flow path switching valve installed inside the air pump 26 is performed by an electromagnetic device, and the current to the electromagnetic device is turned on / off by a current switching device based on an instruction from a control device 23. It has become.

[0005]

However, if there is an accident such as a coil disconnection in the electromagnetic device that operates the flow path switching valve, the flow path switching valve does not operate. In this case, the backwash air cannot be supplied so as not to block the aerobic filter bed. Without passing through the floor, the water is released to the outside of the system with insufficient purification, thereby deteriorating the water quality of the water area to which the water is released. For sewage septic tank managers,
It is obliged to perform regular maintenance and inspection (Article 10 of the Septic Tanks Act). In merger processing septic tanks with 20 tanks or less, the interval of maintenance and inspection is set to at least once every four months,
We don't do maintenance every day. Therefore, when such a problem occurs, there is a concern that the insufficiently purified treated water will continue to be released until the next maintenance and inspection.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a branch port for branching an air flow path from an air-pump main body into a plurality of parts and an air discharge port communicating with the branch port. A flow path switching valve that switches an air flow path at a branch port, an electromagnetic device that operates the flow path switching valve, and a current switching device that turns on and off a current to the electromagnetic device based on an instruction from a control device. It is an object of the present invention to provide an air pump and a sewage purifying tank that allow an administrator to quickly detect an accident such as a coil disconnection in an electromagnetic device that operates a flow path switching valve in an air pump. I do.

[0007]

SUMMARY OF THE INVENTION A first aspect of the present invention is to provide an air-cooling apparatus.
Branch 1 that branches the air flow path from the pump body into multiple
0, 11 and air discharge ports A, B communicating with the branch ports 10, 11; a flow path switching valve 14 for switching an air flow path at the branch ports 10, 11;
When the electromagnetic device 19 is in a closed state, the air pump includes an electromagnetic device 19 that operates the electromagnetic device 19 and a current switching device 2 that turns on and off a current to the electromagnetic device 19 based on an instruction from the control unit 1. This is an air pump provided with a circuit 4 for passing a bypass current to such an extent that the electromagnetic device 19 does not operate in parallel with the current switching device 2 and a means for detecting the bypass current.

Although an accident such as a coil disconnection of an electromagnetic device can be detected by detecting the bypass current, it is preferable from the viewpoint of maintenance and operation of the septic tank to detect the bypass current and display the state. That is, a second aspect of the present invention is the air pump according to the first aspect, which is provided with a device that detects a bypass current and displays the state of the bypass current.

It is further preferable from the standpoint of maintenance and operation of the septic tank that the bypass current is detected and an alarm is issued when there is no current. That is, in a third aspect of the present invention, a device is provided which detects a bypass current when the current switching device is in a closed state, and issues an alarm when there is no current.
Or the air pump according to 2.

Also, it is not preferable to keep the bypass current flowing at all times, because it increases energy consumption. Therefore, it is preferable to pass the bypass current when necessary. That is, a fourth aspect of the present invention is the air pump according to any one of claims 1, 2 and 3, wherein the circuit 4 for passing the bypass current is provided with a device 4b for turning on and off the bypass current.

A fifth aspect of the present invention provides an air flow path for supplying air into the aerobic treatment tank.
A sewage purification tank connected to the discharge port of the air pump described in 1.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In a sewage purification tank, a diaphragm type air pump for discharging air by vibration of a diaphragm is widely used. FIG. 1A is a cross-sectional view showing an example of an air tank 7 of a diaphragm type air pump, and FIG. 1B is an enlarged cross-sectional view of a portion including a flow path switching valve 14.

The air tank 7 has a first air chamber 12 and a second air chamber 12.
The first air chamber 12 and the second air chamber 13 are divided into an air chamber 13, a third air chamber 18, and a fourth air chamber 21. The first air chamber 12 and the second air chamber 13 communicate with each other through an advection port 9 provided in the partition 8. The third air chamber 18 and the third air chamber 18 communicate with each other through the branch port 10, and the second air chamber 13 and the fourth air chamber 21 communicate with each other through the branch port 11. Either the branch port 10 or the branch port 11 is closed by the flow path switching valve 14. The third air chamber 18 is provided with a discharge port A, and the fourth air chamber 21 is provided with a discharge port B. Hereinafter, the embodiment of the present invention will be described assuming that the discharge port A is connected to the diffuser 37 and the discharge port B is connected to the backwash diffuser 38.

FIGS. 1A and 1B show a state where the current to the electromagnetic device 19 is off and the branch port 11 is closed. That is, the discharge port A is connected to the air diffuser 37, and the septic tank is in a normal operation state. The flow path switching valve 14 has a piston 17 having a piston 17 attached to a piston rod 20. One end of the piston rod 20 is connected to the electromagnetic device 19, and the other end is a spring 22 for urging the piston 17 toward the branch port 11.
Are connected. In the embodiment shown in FIGS. 1A and 1B, the electromagnetic device 19 is not operating (the current is turned off), the piston rod 20 is urged by the spring 22, the branch port 10 is opened, and the branch port is opened. 11 is closed by a piston 17. In such a state, the air discharged by the vibration of the diaphragm is in the first air chamber 12.
And flows into the second air chamber 13 through the advection port 9 provided in the partition 8. Next, the air that has flowed into the second air chamber 13 flows into the third air chamber 18 through the branch port 10 as shown by the arrow, and is discharged from the discharge port A.

When operating the backwash air diffuser 38,
The current to the electromagnetic device 19 is turned on, the electromagnetic device 19 is operated, and the piston 17 is moved against the force of the spring 22,
The branch port 10 is closed, and the branch port 11 is opened. Thus, the air that has flowed into the second air chamber 13 flows into the fourth air chamber 21 through the branch port 11 and is discharged from the discharge port B.

FIG. 1C is a schematic diagram showing an example of a system for controlling the electromagnetic device 19. here,
The flow path switching valve 14 is considered as an electromagnetic valve operated by the magnetic force of an electromagnet. This system includes a control unit 1 having a timer function and including a microcomputer and a current switching device 2 which operates by receiving a signal from the control unit.
When a signal from the control unit 1 is transmitted to the current switching device 2,
The current to the coil of the electromagnet is turned on by a built-in actuator (not shown). As a result, the piston 17 of the flow path switching valve 14 closes the branch port 10 and the branch port 11
Move in the direction to open. Further, in parallel with the current switching device 2, even when the current switching device 2 is in the open state, the electromagnetic device 1 is controlled by the resistor 4a or other appropriate means.
A circuit 4 is provided that passes a current limited to such an extent that the 9 does not operate. Further, a display device 6 which is operated by a current flowing through the circuit 4 is provided. Display device 6
Examples thereof include a light-emitting body such as a pilot lamp or a light-emitting diode, a buzzer, and the like. When the light-emitting body is a pilot lamp or a light-emitting diode, the light is always turned on by a current flowing through the circuit 4 and is a buzzer. Sometimes, a switch is provided to turn off the current to the buzzer so that the buzzer does not always operate due to the current flowing through the circuit 4. With this configuration, if a voltage surge such as lightning is applied, or if the power supply voltage exceeds the rated voltage and the coil of the electromagnet is disconnected, the current flowing through the circuit 4 is also cut off at the same time. And
The pilot lamp or light emitting diode goes off or the buzzer sounds. Thus, the administrator can control the electromagnetic device 19
You can know the problem of. A light-emitting body such as a pilot lamp or a light-emitting diode may be configured to be always turned off and turned on when the current flowing through the coil of the electromagnet is completely cut off, similarly to the buzzer. Further, it is preferable that the display device 6 is provided at a place where the manager can easily recognize it. The display device 6 may be provided at the upper end of the cover casing 24 so that the manager can recognize the display device from a wider range, and the mounting place is not limited.

FIG. 1D is a schematic diagram showing another example of a system for controlling the electromagnetic device 19. FIG.
The system shown in (d) is obtained by adding a device 4b for turning on and off the bypass current to the circuit 4 for passing the bypass current in the system shown in FIG. 1 (c). The device 4b for turning on and off the bypass current is normally left open, and closed when it is necessary to detect the state of the electromagnetic device 19, so that the waste current consumed by the circuit 4 that passes the bypass current. Can be eliminated.

Next, the internal structure of the sewage purification tank 27 will be described. The inside of the sewage purification tank 27 is divided into an anaerobic filter tank first chamber 28, an anaerobic filter tank second chamber 29, an aerobic filter tank 30, a treatment water tank 31, and a disinfection tank 32 from the upstream side in the tank. The sewage flowing from the inflow pipe 33 is purified by sequentially passing through the above-described tanks as indicated by arrows, and discharged from the discharge pipe 34 to the outside of the system. In the aerobic filter bed tank 30 described above, an upper filter bed 35 and a lower filter bed 36 are installed vertically, and the upper filter bed 35 is subjected to aerobic treatment.
In the lower filter bed 36, solid matter generated as a result of the aerobic treatment is filtered. In the upper filter bed 35, in order to perform aerobic treatment,
A diffuser 37 is attached below the air diffuser 37 to discharge air. A backwash air diffuser 38 is provided below the lower filter bed 36. The discharge ports A and B of the air pump are connected to air pipes 39 and 40, and one of the air pipes 39 and 40 is connected to the air diffuser pipe 3.
7 and the other is connected to a backwash diffuser 38.

When the operation of the sewage treatment tank constructed as described above is continued, the lower filter bed 36 filters solids generated as a result of the aerobic treatment, so that the filter bed itself is closed. Therefore, the backwash is performed by periodically switching the flow path from the air pump 26 so as to discharge air from the backwash diffuser 38 provided below the lower filter bed 36. The administrator of the sewage purification tank 27 uses the control device 23 to discharge air from the backwashing diffuser 38 at predetermined time intervals and perform aerobic treatment from the diffuser 37 during other times. Is set to be discharged. Thus, it is possible to control two different systems of air discharge with one air pump, and the electromagnetic device for operating the flow path switching valve 14 becomes inoperable due to disconnection, and the air is supplied to the backwash air diffuser 38. Is no longer supplied, it is possible to detect this, so that it is possible to prevent the function of the sewage purification tank 27 from lowering.

The present invention is not limited to the above-described embodiment, but can be applied to all sewage purifying tanks having a structure including a diffuser for aerobic treatment and a diffuser for backwashing.

[0022]

As described above, according to the present invention,
It is possible to detect and display when a trouble occurs in switching the flow path of the air pump, and it is possible to prevent the influence on the air supply destination, for example, the function of the sewage purification tank.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a sectional view showing an example of an air tank 7 of a diaphragm type air pump, FIG. 1B is an enlarged sectional view showing a portion including a flow path switching valve 14, (C) and (d) are schematic diagrams of a system for controlling the electromagnetic device 19.

FIG. 2 is a sectional view of a sewage purification tank.

3A and 3B show the appearance of a sewage purification tank, wherein FIG. 3A is an overall perspective view, and FIG. 3B is an enlarged perspective view showing only an air pump.

[Explanation of symbols]

A, B ... discharge port 1 ... control unit 2 ... current switchgear 4 ...
Circuit 4a ... Resistance 6 ... Display device 7 ... Air tank 8 ... Partition wall 9 ... Advection port 10 ... Branch port 11 ... Branch port 12 ... First air chamber 13 ... Second air chamber
14: flow path switching valve 17: piston 18: third air chamber 19: electromagnetic device
DESCRIPTION OF SYMBOLS 20 ... Piston rod 21 ... Fourth air chamber 22 ... Spring 23 ... Control device 24 ... Cover casing 2
6 ... Air pump 27 ... Sewage purification tank 28 ... Anaerobic filter bed tank 1st chamber 29 ... Anaerobic filter bed tank 2nd chamber 30 ... Aerobic filter bed tank 31 ... Treatment water tank 32 ... Disinfection tank 3
3 ... Inflow pipe 34 ... Discharge pipe 35 ... Upper filter bed 36 ... Lower filter bed 37
... diffuser tube 38 ... diffuser tube for backwashing 39, 40 ... air piping

Claims (5)

[Claims] A branch port for branching an air flow path from the air-pump main body into a plurality of sections, an air discharge port communicating with the branch port, a flow path switching valve for switching an air flow path at the branch port, An air pump including an electromagnetic device that operates a flow path switching valve and a current switching device that turns on and off a current to the electromagnetic device based on an instruction from a control device, wherein the current switching device is in a closed state. An air pump provided with a circuit for passing a bypass current to such an extent that the electromagnetic device does not operate in parallel with the current switching device, and a means for detecting the bypass current. 2. The air pump according to claim 1, further comprising a device for detecting a bypass current and displaying a state of the bypass current. 3. The air pump according to claim 1, further comprising a device that detects a bypass current when the current switching device is in a closed state and issues an alarm when there is no current. 4. A circuit for passing a bypass current on and off in a circuit passing the bypass current.
The air pump described in the above. 5. A sewage purification tank wherein an air flow path for feeding air into the aerobic treatment tank is connected to a discharge port of the air pump according to claim 1, 2, 3, or 4.