JP3676191B2 - Two-neck air pump and sewage septic tank with automatic air volume switching - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-port air pump capable of automatically switching the air volume, that is, an air pump capable of switching the discharge destination according to the time of the day and changing the discharge air volume to a predetermined air volume, and sewage incorporating the same. Related to septic tanks.
[0002]
[Prior art]
FIG. 7 shows a perspective view of the appearance of a conventional sewage septic tank. The sewage flows into the sewage septic tank from the inflow pipe, is treated in the sewage septic tank, and the treated sewage is discharged from the discharge pipe. The sewage septic tank is equipped with an air pump with two outlets. One outlet is used for aeration of the aerobic filter bed tank of the sewage septic tank (here, aerobic decomposition of sewage by microorganisms proceeds), The discharge port is used for backwashing the filter medium.
[0003]
As a flow path switching type air pump having two discharge ports, a pump for switching an air flow path using an electromagnetic valve provided with a flow path opening / closing valve element is already known (Japanese Patent Laid-Open No. 10-238473).
[0004]
As for the control of the power supplied to the pump, a method based on phase control is known (Draft No. 3013411).
[0005]
[Problems to be solved by the invention]
The air pump can switch the discharge destination, but the discharge air volume is constant or fixed, and the discharge air volume cannot be changed to a desired air volume. It is an object of the present invention to provide an air pump that can change (discharge) the discharge air volume to a desired air volume while switching the discharge destination.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration. That is, the air pump for the sewage septic tank of the present invention is
A pump body 1;
An air tank 2 for receiving discharge air from the pump body 1;
A branch flow path 3 in which a flow path switching device 4 is arranged at a branch section in the branch flow path downstream of the air tank 2;
Two outlets A (5) and B (6) at the end of the branch flow path 3,
An air pump comprising a control device 7 for controlling the operation of the pump body 1 to perform aeration or backwashing in a sewage septic tank ,
The control device 7
a) a timer (usually a 24-hour timer);
b) a setting unit for setting the discharge destination and discharge air volume in the initial state, the time for switching the discharge destination, the discharge air volume after switching, and the time for returning to the initial state;
c) a storage unit for storing each of the discharge destinations, discharge air volumes, and times;
d) a power supply unit that increases or decreases the discharge air amount of the pump body by changing the amount of power;
The discharge air volume from each discharge port (5, 6) is a sewage septic tank air pump having a structure that switches to a predetermined discharge air volume at a set switching time and returns to an initial state at the set time.
[0007]
Here, the storage unit is preferably a nonvolatile memory.
[0008]
The present invention also relates to a sewage septic tank incorporating the sewage septic tank air pump.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described more specifically with reference to the accompanying drawings.
FIG. 1 shows an air pump according to an embodiment of the present invention. As shown in the figure, the air pump of the present invention includes a pump body 1, an air tank 2 that receives discharge air from the pump body 1, an air flow path 3 having a branching portion, and a control device 7. The flow path switching device 4 is provided at the branch portion of the air flow path 3, and the end portions of the air flow path 3 are a discharge port A (5) and a discharge port B (6), respectively. Air is supplied from the air supply port 8 and is discharged from the discharge port A (5) or the discharge port B (6). These are generally housed in the casing 9 and integrally formed.
[0010]
Here, in order to perform aeration of the aerobic filter bed tank in the sewage purification tank or backwashing (bubbling) of the filter medium, the control device 7 operates the flow path switching device to switch the discharge destination of the air, The air volume is adjusted. The operation manager of the sewage septic tank simply sets the setting unit (setting means) in the control device 7, and then the sewage septic tank is automatically set at a desired time and at a desired amount of air from a desired outlet at a desired time. Can be supplied with air. A part or all of the setting unit may be separated from the air pump.
[0011]
FIG. 2 is a control block diagram of the air pump of the present invention. There are a setting unit (setting unit), a storage unit (storage unit), a power supply unit (power supply unit), and a drive unit (drive unit) with the control unit (control unit) as the center, and electricity is supplied from the power supply unit. Then, the air pump is driven, and the switching device is driven via the drive unit.
[0012]
In the control unit, a small microcomputer (hereinafter referred to as CPU) is used. This is a switch input from the setting unit, an output of display data, a setting value storage / reading to the storage unit, a power supply unit and a driving unit. It is a center that gives instructions to
[0013]
In the storage unit, the RAM of the CPU can be used, but preferably an EEPROM is used. This is because it is possible to prevent the set value from being lost during a power failure.
[0014]
In the power supply unit, power control is usually performed by switching based on phase control.
[0015]
The setting unit sets the discharge destination and discharge air volume in the initial state, the time for switching the discharge destination, the discharge air volume after switching, and the time for returning to the initial state (or time after switching). These set values are original data for determining the phase angle.
[0016]
FIG. 3 is an external view of the setting unit in the control device for the air pump of the present invention. The control of the air pump of the present invention will be described below with reference to FIG. The setting unit in the control device includes a display unit for time display and air volume display (upper part in FIG. 3), and a setting switch unit for time setting (lower part in FIG. 3). Usually, it is in an automatic operation mode (only the automatic operation mode lamp is lit), and the current time is displayed on the time display.
[0017]
The operation can be switched to the automatic operation mode, the current time setting mode, the backwash start time mode, or the backwash end time mode by operating the mode switch. Here, when the current time setting mode is selected, the automatic operation lamp is turned off and the clock setting lamp is turned on. The current time can be set by the time setting switch.
[0018]
When the backwash start mode is selected, the automatic operation mode lamp is turned off and the backwash start time lamp is turned on. After the backwash start time is set by the time setting switch, the time display is switched to the set air volume display by pressing the air volume setting switch, the air volume display lamp is turned on, and the air volume can be set by the air volume setting switch.
[0019]
FIG. 4 shows an operation example of the setting unit. (A) is the state which set the backwash start time to 3:00 am, (b) is the example which set the air volume at the time of backwashing to "80" L / min. The pump at this time is a pump having a discharge capacity of 80 L / min when the supplied power is 100%, and the air volume can be set in increments of 5 L from “80” L to “40” L at the maximum. Since the supplied power amount and the air volume are in a substantially proportional relationship, the air volume can be controlled by operating 80L with 100% power and 40L with 50% power. Depending on the pump used, there may be no proportional relationship, but this can be dealt with by experimentally obtaining the relationship in advance. Further, when the backwash end time setting mode is selected, the backwash end time lamp is turned on, and the time setting and the air volume can be set in the same manner as in the previous backwash start time mode. Usually, the time for backwashing is about 10 minutes, so the time display is 3:10 am. When the backwash air volume is 80 L / min, the aeration air volume is often set to about 60 L / min (not shown).
[0020]
The set switching time and air volume setting data are paired, stored in the EEPROM as a storage unit via the CPU, and read out via the CPU. FIG. 5 shows a connection diagram between the CPU and the EEPROM. The EEPROM generally has a built-in synchronous serial communication function, and can be easily transmitted and received by connecting to the CPU via three lines as shown in FIG. The communication timing is performed by a synchronization clock from the CLK terminal from the CPU. Data written from the CPU to the EEPROM is serially output from the TX terminal and sent to the DI terminal of the EEPROM. Conversely, read data from the EEPROM to the CPU is sent from the DO terminal of the EEPROM to the RX terminal of the CPU.
[0021]
FIG. 6 shows a specific phase control circuit. The zero cross point of the AC 100V commercial power source is detected by the zero cross circuit and input at the P1 terminal of the CPU. The trigger point of AC100V corresponding to the phase angle from the zero cross point is the air volume setting data set in the setting unit and stored in the EEPROM. By outputting a trigger signal from the P0 terminal of the CPU to the transistor (TR1) based on this data, the photocoupler (PC1) ignites the triac (TRC1) and makes the power to the pump variable. Can do. In the present invention, since the air volume setting data for determining the phase angle can be set / stored in association with the backwash start / end time, the compressed air is discharged from the discharge port with a different air volume at each aeration / backwash time. It becomes possible to do.
[0022]
Such an air pump can respond to a sewage septic tank that requires various amounts of aeration and backwashing air by simply inputting a desired value in the setting unit within a range equal to or less than the maximum airflow value of the air pump.
[0023]
【The invention's effect】
The air pump of the present invention is compact, can switch the discharge destination, and the discharge air volume can be set (switched) to a desired air volume without providing a flow rate adjusting valve for each discharge port. The air pump can be operated. If a non-volatile memory is used for the storage device, the set value will not be lost even in the event of a power failure. Even in the case of an air pump using a diaphragm in the pump body, the life of the diaphragm is not impaired.
In addition, even if it is connected to a sewage septic tank with an air inlet for aerobic filter bed aeration and backwashing (bubbling) of the filter medium, even if the required air volume is different for each installed sewage septic tank With the air pump of the present invention, the air volume can be set locally for each sewage septic tank, and there is no need to prepare a dedicated air pump for each. From the standpoint of production, there is no need to produce different air pumps for each air volume (only the set value is changed), and therefore there is no need to have air pumps with various capacities, and production costs are reduced.
[Brief description of the drawings]
FIG. 1 shows an air pump according to an embodiment of the present invention. (A) is an external appearance perspective view, (b) is an internal block diagram.
FIG. 2 is a control block diagram in the control device.
FIG. 3 is an external view of a setting unit in the control device.
4A and 4B are operation examples of the setting unit, in which FIG. 4A is a setting example of a backwash start time, and FIG. 4B is a setting example of a backwash air amount.
FIG. 5 is a connection diagram between a CPU and an EEPROM.
FIG. 6 is a pump drive phase control circuit diagram.
FIG. 7 is an external perspective view of a conventional sewage septic tank.
[Explanation of symbols]
1: pump body 2: air tank 3: air flow path (with branch) 4: flow path switching device 5: discharge port A 6: discharge port 7: control device 8: air supply port 9: casing

Claims (3)

A pump body;
An air tank that receives discharge air from the pump body;
A branch flow path in which a flow path switching device is disposed at a branch portion of the branch flow path downstream of the air tank;
Two outlets A and B at the end of the branch channel;
An air pump comprising a control device for controlling the operation of the pump body to perform aeration or backwashing in a sewage septic tank ,
The control device
a) a timer;
b) a setting unit for setting the discharge destination and discharge air volume in the initial state, the time for switching the discharge destination, the discharge air volume after switching, and the time for returning to the initial state;
c) a storage unit for storing each of the discharge destinations, the discharge air volume, and the time;
d) a power supply unit that increases or decreases the discharge air amount of the pump body by changing the amount of power;
An air pump for a sewage septic tank having a structure in which the discharge air amount from each discharge port is switched to a predetermined discharge air amount at a set switching time and returns to the initial state at the set time. The air pump for a sewage septic tank according to claim 1, wherein a nonvolatile memory is used as the storage unit. A sewage septic tank comprising the air pump for a sewage septic tank according to claim 1 or 2.

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