JP2002126414A - Iron component removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the futile use of water and the troublesome backwashing operation due to the operation of the backwashing almost everyday in the case of operating the backwashing. SOLUTION: Pressure detecting means A and B for detecting the pressure of Pa and Pb of the inside of pipes are provided respectively in a feed water inlet pipe and a cleaned water outlet pipe and in the case that the difference Pa-Pb of the pressure detected by the pressure detecting means A and B is larger than a previously fixed filtration limit pressure P1, the backwashing is carried out by switching a switching valve to communicate the feed water inlet pipe with the cleaned water outlet and a feed water flow-in pipe with a backwashing water outlet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron removing apparatus for supplying water suitable for drinking water by mainly removing iron and turbid components contained in well water and the like.

[0002]

2. Description of the Related Art An iron removing device is configured to remove iron contained in water by putting a filter material such as sand therein and passing water through the filter material. Then, the filter material needs to be periodically cleaned because the removed iron and the like are deposited and clogged. Therefore, as described in Japanese Patent Application Laid-Open No. 7-100496, a conventional iron removing device switches the flow path from purified water to backwashing by manually operating a switching valve, and removes iron and the like deposited on the filtration material. There is disclosed a technique that removes the.

Further, as described in Japanese Patent Application Laid-Open No. 9-239361, an automatic opening / closing valve is provided between a pressurizing pump and an iron removing device, and a backwash pump is driven when the filter material of the iron removing device is clogged. In addition, there is disclosed a technology in which an automatic on-off valve is switched and backwashing is performed.

[0004]

However, in the technique described in Japanese Patent Application Laid-Open No. Hei 7-100496,
Since the clogging state cannot be grasped, the user has to manually operate the valve almost every day regardless of the clogging state to perform backwashing, which disadvantageously wastes water and is troublesome. there were.

In the technique described in Japanese Patent Application Laid-Open No. 9-239361, the backwashing operation can be performed automatically. However, since a backwash pump or the like for backwashing is required, the apparatus is large. And the cost is increased.

An object of the present invention is to solve the above-mentioned problems, and to provide an energy-saving type iron removing apparatus which has a simple structure and is excellent in usability.

[0007]

In order to achieve the above object, the present invention is characterized in that a raw water inlet pipe connected to the discharge side of a pump device and through which raw water flows, and a raw water inlet pipe connected to the raw water inlet pipe. A switching valve connected to the switching valve, a raw water inflow pipe through which raw water flows, and a tank connected to the raw water inflow pipe and containing a filter medium for filtering raw water flowing from the raw water inflow pipe, Is connected to the tank, the other is connected to the switching valve, the purified water discharge pipe for discharging the purified water filtered in the tank, the purified water outlet pipe connected to the switching valve and through the purified water, In an iron removing device having a backwash water outlet connected to a switching valve and draining water during backwash, pressure detection for detecting pressures Pa and Pb in the raw water inlet pipe and the purified water outlet pipe respectively. Means A, B and the pressure detecting means A, B Control means for controlling the switching valve based on the output result, and in switching the raw water, the switching valve is connected to the raw water inlet pipe and the raw water inflow pipe, and the purified water discharge pipe and the purified water outlet pipe respectively. Are switched so as to communicate with each other to purify the raw water, and when the pressure difference Pa-Pb detected by the pressure detection means A and B is smaller than a predetermined filtration limit pressure Pl, the control means The switching valve holds the position where the water is purified, and the pressure detecting means A,
When the pressure difference Pa-Pb detected in B is larger than a predetermined filtration limit pressure Pl, each of the raw water inlet pipe and the purified water discharge pipe, and the raw water inflow pipe and the backwash water outlet, It is to perform back washing by being switched to communicate.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

First, the necessity of iron removal from well water and the principle of iron removal will be briefly described.

[0010] In general, in the case of tap water, raw water pumped from a river or the like is sterilized or filtered at a water purification plant, and supplied to ordinary households in a state where water quality standards are satisfied.

However, when using well water as drinking water, it is necessary to first request a public agency such as a health center to conduct a water quality test and determine whether the water is suitable as drinking water.

The iron content is one of the items that do not satisfy the water quality standards in the water quality test of well water. The iron removing device is a product that supplies water suitable for drinking water by removing such iron.

The principle process of the iron removing method will be described with reference to FIG.

Generally, most of the iron contained in well water is dissolved iron which is dissolved in water, except in special cases.

In FIG. 1, well water 1 (here, well water containing dissolved iron) is pumped up by a pump device 2, passed through a discharge pipe 3, and sent to an iron removing device 10. A chemical injector 4 is provided between the pump device 2 and the iron removing device 10.
Is installed. The dispenser 4 is connected by a signal line 4a electrically connected to the pump device 2, and transmits information on the operation of the pump device 2 to the dispenser 4 via the signal line 4a. 4 operates in conjunction with the pump device 2.

At the same time when the pump device 2 is started, the medicine injector 4
Operates, and sodium hypochlorite 5 is injected into the discharge pipe 3 via the tube 6.

The dissolved iron contained in the well water 1 is oxidized by the injected sodium hypochlorite 5 to be changed to iron oxide to be solid.

A filter medium 11 is accommodated in the iron removing device 10. The filter medium 11 filters iron oxide, and the well water 1 from which iron and turbid components have been removed is guided to the faucet 7 as purified water. .

The sodium hypochlorite 5 has an action of oxidizing dissolved iron and an action of removing bacteria and Escherichia coli contained in the well water 1. Therefore, the water from the faucet 7 can be said to be safe water suitable as drinking water.

Next, the iron removing device 10 will be described in detail.

FIG. 2 shows an appearance and a partial cross-sectional view of a conventional iron removing device 10. The iron removing device 10 is a filter medium 1
1, a chemical solution inlet 20 for injecting sodium hypochlorite 5 from the chemical injector 4, a raw water inlet pipe 21 into which raw water such as well water flows, and purified water after removing iron and turbid components. Outlet pipe 22 for purifying water to be discharged, and outlet pipe 2 for backwashing water for discharging iron and turbid components accumulated in the filter medium 11 in reverse flow
3. It is composed of main parts such as a switching valve 24 for switching the flow path between purified water and backwashing.

A tank cover 25 is screwed on the upper portion of the tank 12, and a handle 26 for carrying the iron removing device 10 is formed in the center of the tank 12.
Further, on the side surface of the tank 12, a control means 40 having a microcomputer or the like for controlling the switching valve 24 is provided.

Next, FIG. 3 shows a principle diagram for removing iron.
Shown in At this time, the switching valve 24 has switched to the purified water side.

In FIG. 3, the well water 1 flowing from the raw water inlet pipe 21 is connected to the raw water inlet pipe 21 by the switching valve 24 and is sent to the raw water inlet pipe 21 a, and is sent to the upper side of the iron removing device 10. After the iron content of the well water 1 is filtered by the filter medium 11, the well water 1 is sent to the switching valve 24 again through the purified water discharge pipe 22a, and is sent to the purified water outlet pipe 22.
The well water 1 discharged from the purified water outlet pipe 22
As drinking water.

If the filter medium is used for a while in the state shown in FIG. 3, iron and turbid components accumulate in the filter medium 11. When the accumulated amount of these increases, the filter medium 11 becomes clogged,
Sufficient drinking water cannot be supplied. Further, the iron removal capability itself may be reduced, and water containing iron which is not suitable as drinking water may come out of the purified water outlet pipe 22.

For this reason, it is necessary to perform back washing in which water is reversely flown through the filter medium 11 to discharge iron and turbid components to the outside.
Hereinafter, this backwashing operation will be described with reference to FIG.

When the switching valve 24 is switched from the water purification side to the backwashing side, the flow of water changes as shown in FIG. In FIG.
The well water 1 flowing from the raw water inlet pipe 21 is sent to the purified water discharge pipe 22 a by the switching valve 24, and is sent to the lower side of the iron removing device 10. The well water 1 that has flowed into the iron removing device 10 together with the iron accumulated in the filter medium 11
It is sent to the upper side of the iron removing device 10. Then, the water containing iron is sent to the switching valve 24 again via the raw water inflow pipe 21a, and is discharged to the outside from the backwash water outlet pipe 23.

As described above, the water is passed through the iron removing device 10 by the switching valve 24 in reverse, so that the filter medium 1 is removed.
1 can easily remove the iron accumulated.

Next, a system conceptual diagram of an example of an embodiment according to the present invention will be described with reference to FIGS.

In FIG. 5, in this embodiment, a switching valve 2 for switching the flow path between the purified water outlet pipe 22 and the backwash water outlet pipe 23 is provided.
4 was constituted by an electrically operated valve.

The raw water inlet pipe 21 is provided with a pressure detecting means A31 for detecting the pressure from the pump device 2 to the iron removing device 10 in a substantially linear manner, and the purified water outlet pipe 22 is provided with a pressure after filtering the raw water. Pressure detecting means B for detecting substantially linearly
32.

FIG. 6 shows a control block diagram in the present embodiment.

In FIG. 6, the pressure signal Pa detected by the pressure detecting means A31 and the pressure signal Pb detected by the pressure detecting means B32 are input to the control means 40. The control means 40 calculates a difference between the pressure signal Pa and the pressure signal Pb, performs a comparison operation on the difference with a set value Pl stored in the storage device 41 in advance, and outputs an operation signal to the actuator 24a of the switching valve 24 according to the result. Is output.

Here, when the pressure difference between the pressure signal Pa and the pressure signal Pb inputted to the control means 40 is smaller than a predetermined filtration limit pressure Pl, that is, Pa When −Pb <Pl (indicating that the filtration pressure Pσ is small as shown in FIG. 7, that is, a state in which the filter medium 11 is not clogged), the control unit 40 supplies the actuator 24 a of the switching valve 24 with the actuator 24 a. OFF
A signal or an ON signal is transmitted, and the valve 24b holds the purified water side.

When the pressure difference between the pressure signal Pa and the pressure signal Pb inputted to the control means 40 is larger than the filtration limit pressure P1, that is, when Pa−Pb> P1 (the filtration pressure Pσ is large as shown in FIG. 7). In other words, it means that the filter medium 11 is clogged.)
An ON signal or an OFF signal is transmitted to the actuator 24a of the switching valve 24 from the raw water inlet pipe and the purified water discharge pipe,
The valve 24b opens a flow path on the backwash side so that each of the forewater inflow pipe and the backwash water outlet communicate with each other, and an OFF signal is transmitted from the control means 40 to the power relay 4a of the medicine injector 4 so that the chemical The pump 4b is stopped.

By this operation, the iron component and the turbid component accumulated in the filter medium 11 are backwashed for a certain period of time t, whereby
The filter medium 11 can be refreshed.

This control method will be described with reference to the flowchart of FIG.

First, at step 90, the pump device is operating, and at the same time as the pump operation, the drug injector starts operating at step 91.

In step 92, the pressure signal Pa transmitted from the pressure detecting means A and the pressure signal Pb transmitted from the pressure detecting means B are constantly inputted to the microcomputer.
In step 3, the pressure signal Pb is subtracted from the pressure signal Pa. If the value is larger than the filtration limit pressure Pl, an OFF signal or an ON signal is transmitted to the electric operation valve in step 94, and the flow path is opened to the water purification side.

At step 93, the pressure signal Pb is subtracted from the pressure signal Pa. If the value is smaller than the filtration limit pressure Pl, at step 95 the ON signal or the OFF signal is supplied to the electrically operated valve.
A signal is transmitted to open the flow path on the backwash side, and the injection device stops at step 96.

At step 95, at the same time when the flow path is opened to the backwashing side, time counting starts at step 97, and at step 98, it is determined whether the time counted is longer than a predetermined time.

If the result of the determination in step 98 is that the time counted exceeds the predetermined time, step 9
Fly to 3.

According to the present embodiment, after removing iron and turbid components contained in well water and the like, which has been a problem in the conventional iron removing device, the user has to manually operate the filter every day in order to prevent clogging of the filter medium. The operation of the valve and back washing is not required, and the filtration pressure Pσ increases (that is, the filtration material 1).
(When 1 is clogged) When backwashing starts automatically, usability is greatly improved, and stable water supply and water supply pressure are obtained regardless of well water quality and household consumption. Can be.

Further, since the backwash is performed only when the filter medium 11 is clogged, water resources can be saved, and the frequency of starting the pump can be reduced, thereby providing an iron-removing device capable of saving energy. it can.

[0045]

As described above, the present invention is constructed as described above, so that the usability of the iron removing device can be remarkably improved.

Further, it is possible to save water resources and save energy.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire pump device according to an embodiment of the present invention.

FIG. 2 is an external view and a partial cross-sectional view of a conventional iron removing device.

FIG. 3 is a principle diagram of the iron removing device according to the embodiment of the present invention.

FIG. 4 is a principle diagram at the time of backwashing of the iron removing device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a state in which pressure detecting means is used in the iron removing device according to the embodiment of the present invention.

FIG. 6 is a control block diagram according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating a relationship between a water amount and a filtration pressure according to the embodiment of the present invention.

FIG. 8 is a control flowchart according to the embodiment of the present invention.

[Explanation of symbols]

2 ... pump device, 4 ... drug injector, 5 ... sodium hypochlorite, 10 ... iron removal device, 11 ... filter material, 12 ... tank, 20 ... chemical liquid inlet, 21 ... raw water inlet, 22 ... purified water outlet, 23 ... backwash water outlet, 24 ... switching valve, 30 ... electric operation valve, 31 ... pressure detection device A, 32 ... pressure detection device B, 40 ... control means, 41 ... storage device.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B01D 29/08 540A 29/36 B 29/38 520A

Claims (1)

[Claims] 1. A raw water inlet pipe connected to the discharge side of a pump device for passing raw water, a switching valve connected to the raw water inlet pipe, and a raw water inflow pipe connected to the switching valve and passing raw water. When,
A tank that is connected to the raw water inflow pipe and stores a filtering material for filtering raw water flowing from the raw water inflow pipe, one of which is connected to the tank and the other is connected to the switching valve and is filtered in the tank; An iron pipe having a purified water discharge pipe for discharging purified water, a purified water outlet pipe connected to the switching valve and passing the purified water, and a backwash water outlet connected to the switch valve and draining water during backwashing. In the removing device, pressure detecting means A and B for detecting pressures Pa and Pb in the pipes of the raw water inlet pipe and the purified water outlet pipe, respectively, and the switching valve based on detection results of the pressure detecting means A and B Control valve for controlling the raw water, the switching valve is switched so that each of the raw water inlet pipe and the raw water inlet pipe, and the purified water discharge pipe and the purified water outlet pipe communicate with each other. Purify raw water The means holds a position where the switching valve becomes clean when the pressure difference Pa-Pb detected by the pressure detecting means A and B is smaller than a predetermined filtration limit pressure Pl. Pressure difference Pa-Pb detected by A and B
Is larger than a predetermined filtration limit pressure Pl, the raw water inlet pipe and the purified water discharge pipe, and the raw water inflow pipe and the backwash water outlet are switched so as to communicate with each other to perform backwashing. An iron removal device characterized by performing.