JPH0929014A - Water purification device - Google Patents

Abstract

(57) Abstract: To provide a water purification apparatus capable of obtaining an optimum cleaning interval according to the speed of clogging. SOLUTION: A real part 2 is obtained by pumping out water through a pumping pipe 25 that communicates with an internal space part 23 of a filter 13.
2, a pump 50 for generating a water flow from the outside to the inside,
The cleaning means 51 for cleaning the real part 22, the pressure sensor 45 arranged inside the pumping pipe 25, and the real part 22 by the cleaning means 51 when the pressure detected by the pressure sensor 45 exceeds a predetermined value. By including the control means 43 for cleaning, cleaning is performed according to the pressure inside the pumping pipe 25 that correlates with the clogging of the real part 22.

Description

Detailed Description of the Invention

[0001]

The present invention relates to, for example, lakes, marshes, ponds,
The present invention relates to a water purification device for purifying water in dams, reservoirs, reservoirs, rivers, irrigation canals, moats, canals, aquariums, and the like.

[0002]

BACKGROUND ART Lakes, ponds, dams, reservoirs, reservoirs, rivers,
2. Description of the Related Art A water purification device for purifying water has been installed as a water pollution countermeasure in a purification target such as an irrigation canal, a moat, a canal, and a water tank. As such a water purification device, a filter having a real part and an internal space part, which is arranged below the water surface,
A pump for generating a water flow from the outside to the internal space side in the real part by pumping water from the internal space part through a pumping pipe communicating with the internal space part of the filter, which is generated by the pump It is considered that water is forcibly passed through the real part of the filter to be purified.

[0003]

By the way, in the above-mentioned water purification apparatus, if the purification treatment is carried out for a long period of time, there arises a problem that the real part of the filter is clogged. Therefore, by providing a cleaning means for cleaning the real part of the filter,
It is considered that the cleaning means performs cleaning at regular intervals. However, the speed of clogging varies depending on the degree of dirt to be cleaned. Therefore, if the cleaning is performed at regular intervals, the cleaning interval may be too short or conversely too long. It was expected that the problem of being unable to do so would occur. Therefore, an object of the present invention is to provide a water purification device that can obtain an optimum cleaning interval according to the speed of clogging.

[0004]

In order to achieve the above object, a water purification apparatus according to claim 1 of the present invention comprises a filter having a real part and an internal space part, which is arranged below the water surface, and the filter. A pump for generating a water flow from the outside to the internal space part side of the real part by pumping water from the internal space part through a pumping pipe communicating with the internal space part,
A cleaning means for cleaning the real part of the filter, a pressure sensor arranged inside the pumping pipe, and a real part of the filter by the cleaning means when the pressure detected by the pressure sensor exceeds a predetermined value. And a control means for cleaning. As a result, the control means causes the cleaning means to clean the real part of the filter when the pressure detected by the pressure sensor arranged inside the pumping pipe exceeds a predetermined value. The cleaning is performed according to the pressure inside the pumping pipe that correlates with the clogging condition of the pump.

[0005] The water purifying apparatus according to claim 2 of the present invention comprises:
The pump according to claim 1, wherein the pump has a lower portion of the pumping pipe that opens to an inner space of the filter and an upper portion that opens to the outside of the filter, and the pumping pipe is inserted into the pumping pipe. Has an air ejection pipe for ejecting air from an ejection portion arranged at a predetermined intermediate position, and by ejecting air from the ejection portion to generate a water flow from the lower part to the upper part in the pumping pipe. Water is pumped out from the internal space of the filter, and the pressure sensor is arranged below the jet part inside the pumping pipe. As a result, even if the air ejection pipe of the pump ejects air from the ejection portion inside the pumping pipe, the pressure sensor detects the pressure below the ejection portion inside the pumping pipe, and is ejected from the ejection portion and goes upward. Not affected by air.

[0006] The water purifying apparatus according to claim 3 of the present invention comprises:
The control means according to claim 1 or 2, wherein when the pressure detected by the pressure sensor exceeds a predetermined value, the cleaning means cleans the real part of the filter for a certain period of time, The feature is that the cleaning is stopped after the elapse. Accordingly, when the control unit causes the cleaning unit to clean the real part of the filter, the control unit stops the cleaning after a lapse of a certain time, which facilitates the control.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a water purification apparatus of the present invention will be described below with reference to the drawings. First, what is indicated by reference numeral 11 in FIG. 1 is a water purification device. The water purification device 11 is used by being floated on a purification target 10 such as a pond or a lake, and a float 12 for floating in water, and detachably supported below the float 12 and below the water surface 10a. The filter cartridge (filter) 13 to be arranged and the water surface 10 fixed to the upper side of the float 12
and a control box 14 arranged on a.

The filter cartridge 13 is formed of a non-corrosive member such as stainless steel or vinyl chloride or a non-corrosion-treated steel plate into a cylindrical shape having an outer diameter of 1.2 m and a length of 3 m, for example. An outer cylindrical portion 13a having a large number of water collecting holes 16 formed on the entire surface and a member similar to the outer cylindrical portion 13a are formed into a cylindrical shape having a diameter of, for example, 50 to 200 mm, and are formed inside the outer cylindrical portion 13a. It has an inner cylindrical portion 13b which is coaxially arranged and has a large number of inflow holes 17 having a diameter of, for example, about 10 mm, which are formed at predetermined intervals, and an attachment hole 18 having a larger diameter than the inner cylindrical portion 13b is formed. And a disc-shaped closing member 13c with a hole fixed to the upper end surface of the outer cylindrical portion 13a, and the outer cylindrical portion 13a and the inner cylindrical portion 13b.
A disk-shaped closing member 13d fixed to the lower end surface of the disk so as to close all of these downward openings, and the closing member 1
3c is fitted into the mounting hole 18 and the closing member 13c closes the upward opening of the gap between the outer cylindrical portion 13a and the inner cylindrical portion 13b, and fits in the center with a diameter smaller than that of the inner cylindrical portion 13b. It has the closing member 13e in which the joint hole 19 was formed.

The closing members 13c, 13d, 13e
The space between the outer cylindrical portion 13a and the inner cylindrical portion 13b, which is closed by, is filled with a filter medium 21 such as charcoal having a diameter larger than that of the water collecting hole 16 and the inflow hole 17, and is made of organic matter. Aerobic microorganisms that decompose
A processing layer (real part) 22 is formed. The filter cartridge 13 is attached to the float 12 so that the axes of the outer cylindrical portion 13a and the inner cylindrical portion 13b are along the vertical direction while being floated by the float 12.

In the fitting hole 19 of the upper closing member 13e,
A cylindrical pumping pipe 25 made of vinyl chloride or the like extending in the internal space 23 defined by the closing members 13d and 13e and the inner cylindrical portion 13b is coaxial with the inner cylindrical portion 13b and its outer peripheral surface is The inner space portion 23 is fitted and fixed to the inner peripheral surface of the inner cylindrical portion 13b with a predetermined gap therebetween, so that the inner space portion 23 cannot communicate with the outside except through the treatment layer 22 or the pumping pipe 25. It is said that.

The pumping pipe 25 extends from the closing member 13e to a position slightly in front of the closing member 13d in the internal space 23 to open the lower end opening 25a and the upper end opening 25b to the water purification device 11. Is opened upward from the closing member 13e so as to communicate with the gap between the filter cartridge 13 and the float 12, which is open to the outside.

The pumping pipe 25 has a cylindrical air ejection pipe 26.
Is inserted with a gap, and the air ejection pipe 26 is
The lower end portion extends to a predetermined intermediate position slightly above the lower end opening 25a in the pumping pipe 25 and the upper end portion has a pumping pipe 25.
In a state of being projected further upward, it is coaxially attached to the closing member 13e by the attachment 27. A plurality of air ejection holes (ejection portions) 28 are formed at the lower end of the air ejection pipe 26 so that the inside of the air ejection pipe 26 communicates with the outside. And
The air ejection pipe 26 is connected to the upper end of a connecting pipe 30.
It is connected to the control box 14 via.

The lower end position of the processing layer 22, that is, the outer cylindrical portion 1
A cylindrical air ejection pipe 32 is provided along the upper surface of the closing member 13d between the inner surface 3a and the inner cylindrical portion 13b. In the air ejection pipe 32, a plurality of air ejection holes 33 are formed in the length direction so that the inside of the air ejection pipe 32 communicates with the outside. The air ejection pipe 33 is closed at the tip end side and extends to the outside of the outer cylindrical portion 13a at the base end side, and the base end side is connected to the control box 1 via the connecting pipe 35.
Connected to four. Further, the air ejection pipe 32 is formed in one or a plurality of annular shapes at the upper surface position of the closing member 13d between the outer cylindrical portion 13a and the inner cylindrical portion 13b, and a plurality of air ejection holes 33 are formed in the circumferential direction. You may do it.

The control box 14 has two compressors 39 and 40 for supplying air into a casing 38 having a ventilation hole 37 closed by a blind 36 so that water cannot easily enter from the outside. A controller (control means) 43 connected to the compressors 39, 40 and connected to an external power supply 42 arranged on the shore side via an electric wire 41 is arranged. The controller 43 is an external power supply 42. From each compressor 39,
Setting and control of each power supply to the 40.

The one compressor 39 is connected to the connecting pipe 30 and supplies air to the air ejection pipe 26 in response to a command from the controller 43. Here, when the supplied air is ejected from the air ejection hole 28 of the air ejection pipe 26, it becomes bubbles and moves from the bottom to the top in the pumping pipe 25, and the movement of the bubbles causes the inside of the pumping pipe 25 to move. As a result, an upward water flow is generated, so that the water in the internal space 23, that is, the water that has already passed through the treatment layer 22 is pumped from the lower end opening 25a on the internal space 23 side of the pumping pipe 25 and discharged to the outside from the upper opening 25b. Let As a result, the water on the outer side of the side of the filter cartridge 13 is forced to pass through the treatment layer 22 inward in the radial direction and reaches the internal space 23 to be purified. In addition,
The amount of air supplied from the compressor 39 to the air ejection pipe 26 is, for example, 0.5 to 0.5 inward in the treatment layer 22 in the radial direction of water.
It is set to pass at a speed of about 4 (cm / min).

The other compressor 40 is connected to the connecting pipe 35 and supplies air to the air ejection pipe 32 in response to a command from the controller 43. Here, when the supplied air is ejected from the air ejection holes 33 of the air ejection pipe 32, the air becomes bubbles and mainly moves upward in the processing layer 22. Due to the impact or the like caused by the movement of the bubbles, the filter material 21 forming the treatment layer 22 is vibrated to remove the attached dust, and the dust is transported to the outside of the treatment layer 22 by the water flow generated by the movement of the bubbles. . In this way, the treatment layer 2
The dust accumulated in 2 is removed, and the processing layer 22 is washed.

In the present embodiment, the pumping pipe 25
Inside the lower part of the pressure sensor 45 for measuring the suction pressure (that is, pressure loss) at the lower end opening 25a.
Is provided. The pressure sensor 45 is firmly fixed to the inside of the lower portion of the pumping pipe 25 by a substantially arcuate fixture 46 as shown in FIG. 2 so that its position does not change even with the flow of water. The pressure sensor 45 is a cable 4
It is connected to the controller 43 via 7 and outputs a measurement signal according to the measured pressure to the controller 43. Here, the pressure sensor 45 can be fixed not only at the lower inside of the pumping pipe 25 but also at other positions inside the pumping pipe 25. However, since air is ejected from the air ejection hole 28, it is arranged below the air ejection hole 28 inside the pumping pipe 25 so as to eliminate the influence of the air.

The water purification device 11 is connected to the shore by a rope or a wire (not shown) so as not to move due to wind or the like. An alarm lamp (notifying means) 48 that is driven by the controller 43 and lights up is provided at a position on the outer surface of the housing 38 of the control box 14 that is easily visible from the shore. Further, the compressor 39, the connecting pipe 30, the air ejection pipe 26, and the pumping pipe 25.
Constitute an air lift type pump 50, and the compressor 40, the connecting pipe 35 and the air jet pipe 32 constitute a cleaning device (cleaning means) 51.

Next, the operation of the water purification device 11 will be described below with reference to the flow charts shown in FIGS. 3 and 4, focusing on the control contents of the controller 43. First, during the normal purification processing operation, the electric power supplied from the external power supply 42 to the power supply device (not shown) in the control box 14 is compressed by the compressor 39 of the pump 50 by a predetermined amount set in advance via the power supply device. To operate only the compressor 39 (step S1).

As a result, the compressor 39 supplies the air ejection pipe 26 with a predetermined amount of air. Then, the supplied air causes the air ejection holes 28 of the air ejection pipe 26 to
From the lower end opening 25a of the pumping pipe 25 to the internal space 2 from the lower end opening 25a of the pumping pipe 25.
The water in 3 is pumped up and discharged from the upper opening 25b to the outside. As a result, the water on the outer side of the side of the filter cartridge 13, that is, the water in the vicinity of the water surface 10a containing a lot of algae such as blue-green algae is forcibly collected.
6 to the treatment layer 22 and passes through the treatment layer 22 inward in the radial direction, and from the inflow hole 17 of the inner cylindrical portion 13b to the inner space portion 2
Up to 3. Then, when passing through the processing layer 22, the processing layer 2
Water is purified by adsorbing algae such as blue-green algae, organic suspended solids, soluble organic substances, and the like to the filter medium 21 that forms part 2. Here, the substances and the like adsorbed on the filter medium 21 are decomposed by the aerobic microorganisms carried on the filter medium 21. In this way, the water purified in the treatment layer 22 is again discharged from the pumping pipe 25 to the outside, and the purification target 10 is purified by such a circulation of water.

After the operation of the compressor 43 is started, the counter is reset (step S2) and the timer is reset (step S3), and a preset pressure measurement time interval t ₁ elapses from the timer time t. It is determined whether or not (step S4). Pressure measurement time interval t
_{When 1} has not elapsed, the timing is continued until the time elapses, and when the pressure measurement time interval t ₁ has elapsed, the suction pressure −P _S is measured from the measurement signal of the pressure sensor 45 (step S
5). Then, it is determined whether or not this suction pressure -P _S is larger than a preset limit suction pressure -P _S0 (step S6). That is, when purification treatment is performed for a long period of time, the aerobic microorganisms carried on the treatment layer 22 proliferate or the dung after the aerobic microorganisms are decomposed is accumulated in the treatment layer 22 and the treatment layer 22 is clogged. , The suction pressure −P _S increases due to the degree of clogging of the treatment layer 22,
This is monitored to monitor the degree of clogging of the processing layer 22.

Here, the limit suction pressure -P _S0 is set as follows, for example. The relationship between the suction pressure −P _{S at} the lower portion of the pumping pipe 25 and the pumping amount Q when the air flow rate V by the compressor 39 is the predetermined amount V ₀ adopted during the purification processing operation will be obtained. As for these relationships, as shown in FIG. 5, when the suction pressure −P _S increases, the pumped water amount Q decreases almost linearly. Next, the minimum pumping amount Q ₀ required for purification is set, and the suction pressure −P _S0 at the lower part of the pumping pipe 25 under the conditions of V = V ₀ and Q = Q ₀ is obtained from the above relation, and this is the limit. Use suction pressure.

Then, in step S6, if the relationship of suction pressure-P _S > limit suction pressure-P _S 0 is not satisfied, it is judged that the treatment layer 22 is slightly clogged, and the process returns to step S3. instead maintains normal purification process operating conditions Te, while the suction when the relationship between the pressure -P _S> limit suction pressure -P _S0 is satisfied, clogging of the treatment layer 22 is determined to become larger, the timer At the same time as resetting (step S7), the operation of the compressor 39 of the pump 50 is stopped to stop the purification treatment operation, and the cleaning device 51 is stopped.
The compressor 40 is operated to start the cleaning processing operation (step S8). As a result, air is ejected from the air ejection holes 33 of the air ejection pipe 32 provided at the lower end of the treatment layer 22, and the air becomes bubbles and moves mainly upward in the treatment layer 22. To do. Due to the impact or the like caused by the movement of the bubbles, vibration is generated in the filter medium 21 constituting the treatment layer 22 and the attached dust is peeled off, and the dust is transported to the outside of the treatment layer 22 by the water flow generated by the movement of the bubbles. . In this way, the dust accumulated in the processing layer 22 is removed,
The treatment layer 22 is washed.

Next, the timer count time t, after starting the washing process operation, it is determined whether the washing time t ₀ of the preset dose has elapsed (step S9), and the cleaning time t ₀
Is not elapsed, the cleaning processing operation state is maintained, and when the cleaning time t ₀ is elapsed, the operation of the compressor 40 of the cleaning device 51 is stopped to stop the cleaning processing operation, and the compressor of the pump 50 is also stopped. 39 is operated to start the purification processing operation (step S10).

Further, the suction pressure -P _S is measured from the measurement signal of the pressure sensor 45 (step S11),
The suction pressure -P _S, pressure -P _S1 suction set preset (but, -P _S0> -P _S1) and compares (step S12). Suction pressure -P _S <set suction pressure -P _S1
If the condition is satisfied, it is determined that the clogging of the processing layer 22 is eliminated and the cleaning is completed, and the process returns to step S2. On the other hand, when the suction pressure −P _S <the set suction pressure −P _S1 is not satisfied, 1 is added to the counter n that counts the number of cleanings (step S13), and then the counter n is set to the preset maximum value. The number of cleanings n _max is compared (step S1).
4). When the value of the counter n has not reached the maximum number of times of cleaning n _max , the process returns to step S7, and after the timer is reset, the compressor 39 is stopped to stop the cleaning process operation, and the compressor 40 starts the cleaning process operation. Let it start. On the other hand, when the value of the counter n reaches the maximum number of times of cleaning n _max , the compressor 39 is stopped and the purification processing operation is stopped (step S1).
5) Then, the alarm lamp 48 is turned on to notify the abnormality (step S16).

As described above, the clogging of the processing layer 22 is not eliminated even if the cleaning processing operation is performed the maximum number of times of cleaning n _max .
In other words, the flow rate of water passing through the treatment layer 22 can always be maintained at or above the minimum value required for purification, except when the purification capacity of the treatment layer 22 does not recover.

According to the water purification device 11 described above,
Since the air lift type pump 50 that ejects air from the air ejection hole 28 near the lower portion of the air ejection pipe 26 to the vicinity of the lower portion of the pumping pipe 25 is used, the treatment layer 22 is not only purified by passing water but also the treatment layer 22. The air supply to the aerobic microorganisms and the maintenance of the ecosystem such as fish by maintaining the dissolved oxygen of the purification target 10 can be realized with an easy structure, and therefore the equipment cost and the operating cost can be reduced. The purification process can be carried out easily and inexpensively.

Further, since the float 12 is only floated on the purification target 10, there is no need for a separate installation space on the shore or the like outside the purification target 10, the workability can be improved, and the device is installed outside the purification target 10. It can also prevent aesthetic damage. Furthermore, since it is floated on the purification target 10 with the float 12, algae such as blue-green algae, which are particularly frequently generated near the water surface 10a, can be efficiently removed, and the clarity can be improved,
Oxygen contained in a large amount in blue water can be circulated to the entire purification target 10 by the circulation of the water of the purification target 10.
The self-cleaning action of can be activated. In addition, since the treatment layer 22 is detachably provided as the packaged filter cartridge 13, its manufacturability can be improved, mass production can be realized easily, and maintenance management of the water purification apparatus 11 can be facilitated. Become.

Further, charcoal is used as the filtering material 21 of the treatment layer 22, the charcoal has extremely large porosity and specific surface area, and sodium (Na) and potassium necessary for biochemical reaction of aerobic microorganisms. (K), calcium (C
a), magnesium (Mg), iron (Fe), copper (C
Since u), zinc (Zn), and other elements are contained, the amount of aerobic microorganisms supported per unit weight of charcoal is increased, and aerobic microorganisms can be favorably supported, thus improving the purification treatment efficiency. be able to. In addition, since charcoal has a pore diameter larger than activated carbon, it is possible to prevent pores from being blocked by aerobic microorganisms carried thereon, and to reduce microbes other than microorganisms such as bacteria and plankton that can be carried on activated carbon. Aerobic microorganisms such as animals can be carried, and the purification efficiency can be improved. In addition, even if inorganic agrochemicals that cannot decompose aerobic microorganisms or industrial wastewater that has not been sufficiently treated may inadvertently flow into the purification target 10, they can be adsorbed to charcoal and the ecology of the purification target 10 can be improved. The system can be maintained well.

In addition to the above, the following characteristic effects can be obtained. The controller 43 drives the compressor 40 of the cleaning device 51 when the suction pressure −P _S detected by the pressure sensor 45 arranged inside the pumping pipe 25 exceeds a preset limit suction pressure −P _S0. Then, air is jetted by the air jet pipe 32 to wash the treatment layer 22, so that the timing of washing is determined according to the suction pressure inside the pumping pipe 25 that correlates with the clogging of the treatment layer 22. It will be washed. Therefore, when the purification target 10 is extremely dirty and the progress speed of the clogging of the treatment layer 22 is fast, it is short, and when the purification target 10 is slightly dirty and the progress speed of the clogging of the treatment layer 22 is slow, it is long. That is, the optimum cleaning interval can be obtained according to the degree of contamination of the purification target 10, and as a result, stable purification performance can be obtained for a long period of time. Moreover, since the pressure sensor 45 is used, it can be realized with a simple structure and control.

Further, as described above, even if the air lift type pump 50 is adopted and the air ejection pipe 26 ejects air from the air ejection hole 28 in the pumping pipe 25, the pressure sensor 45 is provided inside the pumping pipe 25. Since the pressure is detected on the lower side of the air ejection hole 28, it is not affected by the air ejected from the air ejection hole 28 and traveling upward. Therefore, the pump 50 is
Even if the air is ejected from the air ejection hole 28 in 5, the accuracy of pressure detection can be maintained.

Further, the controller 43 has a cleaning device 5
When the compressor 40 of No. 1 is driven and the air is ejected from the air ejection pipe 32 to clean the processing layer 22, the cleaning is stopped after the lapse of a certain cleaning time t ₀ , so that the control becomes easy. Therefore, cost can be reduced.

In addition, the controller 43 controls the cleaning device 5
When the compressor 40 of No. 1 is driven to wash the treatment layer 22 and then the washing is stopped, the suction pressure −P _S detected by the pressure sensor 45 is equal to or higher than the preset set suction pressure −P _S1 . In this case, since the treatment layer 22 is repeatedly washed by the washing device 51 for a certain washing time t ₀ ,
Cleaning is performed a number of times according to the clogging state, and thus unnecessary cleaning is not performed. Further, when the number of times the cleaning is repeated reaches the maximum number of times of cleaning n _max , the compressor 40 is stopped and the cleaning processing operation is stopped.
When the effect of the cleaning processing operation cannot be obtained, it is possible to prevent unnecessary repetition of the cleaning processing operation. Therefore, the cleaning operation can be efficiently performed. In addition, since the alarm lamp 48 lights up to notify the abnormality to the outside, the abnormality can be easily detected, and it is possible to prevent the abnormality from being left for a long time.

Further, since the cleaning device 51 cleans the processing layer 22 by ejecting air to the vicinity of the lower portion of the processing layer 22, the cleaning can be performed with a relatively easy structure and Air can also be supplied to the aerobic microorganisms carried on the treatment layer 22.

[0035]

As described in detail above, claim 1 of the present invention
According to the water purification apparatus described, the control means, when the pressure detected by the pressure sensor arranged inside the pumping pipe exceeds a predetermined value, to wash the real part of the filter by the washing means, Therefore, the cleaning is performed according to the pressure inside the pumping pipe that correlates with the clogging of the real part of the filter. Therefore, the optimum cleaning interval can be obtained according to the speed of clogging, and as a result, stable purification performance can be obtained over a long period of time. Moreover, since the pressure sensor is used, it can be realized with a simple structure and control.

According to the water purification apparatus of the second aspect of the present invention, even if the air ejection pipe of the pump ejects air from the ejection portion in the pumping pipe, the pressure sensor is located below the ejection portion inside the pumping pipe. Since the pressure is detected at, there is no influence of the air jetted from the jet portion and traveling upward. Therefore, even if the pump ejects the air from the ejection portion in the pumping pipe, the accuracy of pressure detection can be maintained.

According to the water purification apparatus of the third aspect of the present invention, when the control means cleans the real part of the filter by the cleaning means, the cleaning is stopped after a lapse of a certain time, so that the control is easy. Become. Therefore, cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a water purification device of the present invention.

FIG. 2 shows a pressure sensor mounting portion of an embodiment of a water purification apparatus of the present invention, in which (a) is a side sectional view,
(B) is the figure seen from the lower part in (a).

FIG. 3 is a flowchart showing a part of control contents of the controller of the embodiment of the water purification apparatus of the present invention.

FIG. 4 is a flowchart showing another part of the control contents of the controller of the embodiment of the water purification apparatus of the present invention.

FIG. 5 is a drawing amount (vertical axis) with respect to a suction pressure (horizontal axis) in the lower portion of the pumping pipe in the embodiment of the water purification apparatus of the present invention.
FIG. 6 is a characteristic diagram showing the relationship of FIG.

[Explanation of symbols]

 10a Water surface 13 Filter cartridge (filter) 22 Treatment layer (real part) 23 Internal space part 25 Pumping pipe 26 Air jetting pipe 28 Air jetting hole (jetting part) 43 Controller 45 Pressure sensor 48 Alarm lamp (informing means) 50 Pump 51 Washing Device (cleaning means)

Claims (3)

[Claims] 1. A pump having a real part and an internal space and arranged below the water surface, and pumping water from the internal space through a pumping pipe communicating with the internal space of the filter. A pump for generating a water flow from the outside to the internal space side in the real part, a cleaning means for cleaning the real part of the filter, a pressure sensor arranged inside the pumping pipe, and the pressure sensor. And a control unit for cleaning the real part of the filter by the cleaning unit when the detected pressure exceeds a predetermined value. 2. In the pump, the pumping pipe has a lower part opened to an inner space part of the filter and an upper part opened to the outside of the filter, and the pump is inserted into the pumping pipe and an intermediate predetermined part of the pumping pipe. An air jet pipe for jetting air from a jet portion arranged at a position is provided, and by jetting air from the jet portion, a water flow from a lower portion to an upper portion is generated in the pumping pipe to cause the above-mentioned filter of the filter. The water purification apparatus according to claim 1, wherein water is pumped out from the internal space portion, and the pressure sensor is arranged below the jet portion inside the pumping pipe. 3. The control means causes the cleaning means to clean the real part of the filter for a predetermined time when the pressure detected by the pressure sensor exceeds a predetermined value, and stops the cleaning after the lapse of the predetermined time. The water purification apparatus according to claim 1 or 2, wherein