JP3426964B2 - How to clean water filter - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a filter cleaning method for a water purifier used for filtering liquids such as water, seawater, and chemicals.

[0002]

2. Description of the Related Art Conventionally, in a water purifier used for filtering a liquid, it is necessary to regularly clean a filter, and a compressor or a blower is used for cleaning the filter. The circuit structure of a water purifier equipped with a compressor and a blower for cleaning the filter will be described with reference to FIG. This water purifier is a pump 1, which sucks up and supplies water from a reservoir.
The filter 2 for filtering the water supplied from the pump 1, the compressor 3 for cleaning the filter 2 and the blower 4 are the main components. The filter 2 is housed in the housing 5, and the inside of the housing 5 is the filter 2 and the primary side into which the water supplied from the pump 1 flows.
It is divided into a secondary side filled with water filtered by. A strainer 6 is attached to the suction-side end of the pump 1 to prevent suction of large dust.

A passage 7 is provided between the discharge side of the pump 1 and the primary side of the housing 5, and a first valve 8 is provided in the passage 7. One end of a passage 9 is connected to the secondary side in the housing 5, a faucet 10 is attached to the other end of the passage 9, and a second valve 11 is provided in the middle of the passage 9.

A passage 12 is branched from the middle of the passage 7,
A drain port 13 is provided at the tip of the passage 12, and a third valve 14 is provided in the middle of the passage 12. The passage 15 having the compressor 3 connected to one end has the passage 9 at the other end.
Connected in the middle of the passage, and in the middle of the passage 15, the fourth valve 16
Is provided. Passage 1 with a blower 4 connected at one end
The other end of 7 is connected in the middle of the passage 7, and a fifth valve 18 is provided in the middle of the passage 17. A passage 19 having one end connected to the upper end of the primary side of the housing 5 and the other end opening to the atmosphere is provided, and a sixth valve 20 is provided in the middle of the passage 19.

In such a structure, the water is filtered by the filter 2
When the water is filtered through and water is supplied from the faucet 10, the first valve 8 and the second valve 11 are opened and the other valves are closed to drive the pump 1. The water sucked up by the pump 1 is filtered by passing through the filter 2 from the primary side to the secondary side, and the filtered purified water is supplied from the faucet 10.

The cleaning of the filter 2 is carried out in two steps: back pressure cleaning by driving the compressor 3 and bubbling cleaning by driving the blower 4.

During the first-stage back pressure cleaning, the fourth valve 1
6 and the sixth valve 20 are opened and the other valves are closed to drive the compressor 3. The pressure of the air sent from the compressor 3 causes the water in the housing 5 to flow backward from the secondary side to the primary side, and adheres to the primary side of the filter 2 to remove dirt from the filter 2. At this time, part of the water that flowed back was
Drained from the passage 19 through the sixth valve 20.

After the back pressure cleaning, the compressor 3 is stopped and the blower 4 is driven to perform the second-stage bubbling cleaning. During the bubbling cleaning, the fifth valve 18 and the sixth valve 20 are opened and the other valves are closed. The air sent from the blower 4 becomes air bubbles in the housing 5, and the air bubbles wash the primary side of the filter 2. The air sent from the blower 4 passes through the inside of the sixth valve 20 and is discharged into the atmosphere.

After the back pressure cleaning and the bubbling cleaning are completed, the third valve 14 and the sixth valve 20 are opened, and the water containing dirt in the housing 5 is drained from the drain port 13.

[0010]

In the conventional water purifier shown in FIG. 6, the compressor 3 for cleaning the filter 2 is used.
Since at least one of the blower 4 and the blower 4 is required, it becomes expensive. Further, if the mounting bases of the compressor 3 and the blower 4 are included, the water purifier as a whole becomes large in size and heavy in weight, and it takes time and trouble to handle it at the time of installation or movement. Furthermore, it is necessary to regularly perform maintenance on the compressor 3 and the blower 4.

Therefore, an object of the present invention is to provide a filter cleaning device for a water purifier that can perform back pressure cleaning and bubbling cleaning of a filter without using a compressor or a blower.

[0012]

The invention according to claim 1 is
The unfiltered liquid is supplied by the pump, in the filter cleaning method purifier filtration by passing from the primary side of the filter housed unfiltered liquid supplied into the housing to the secondary side by the pump, back pressure Before washing
A first valve provided on the suction side of the pump and the pump
Installed in the passage between the discharge side of the
Mounted on the secondary side inside the housing.
The closed fourth valve and closes the primary in the housing
Side and downstream of the first valve on the suction side of the pump
Open / close switching unit that opens / closes the negative pressure passage that connects the
And a branch between the discharge side of the pump and the third valve
And a fifth valve provided in the opened passage to open the pump.
The negative pressure generating passage and the negative pressure generating passage.
Negative pressure is applied to the primary side of the housing, and then the fourth bar
The secondary side to the primary side of the filter by opening the valve
The atmospheric pressure is applied to the.

Therefore, by switching the open / close switching section to the open state to communicate the negative pressure generating passage and driving the pump, negative pressure acts on the primary side in the housing. When the negative pressure acting on the primary side in the housing reaches a predetermined value, the passage that is in communication with the secondary side in the housing and is filled with the filtered liquid is connected to the atmosphere. The liquid filled in the secondary side of the filter flows back from the secondary side of the filter to the primary side by the atmospheric pressure, and the back pressure cleaning of the filter is performed.

According to a second aspect of the present invention, in the first aspect of the invention, when the bubbling cleaning is performed, the first valve and the front valve are
Close the serial third valve and the fourth valve, closing cutting the negative pressure generating passage between the primary side and the closing switching unit for opening and closing switch the air inlet through passage for communicating the atmosphere within the housing
Open the open / close switching unit and the fifth valve to change
Drive the pump so that the air in the atmosphere is
Through the inflow passage into the housing from the primary side
It was designed to generate bubbles.

Therefore, by switching the open / close switching portion to the open state to communicate the air inflow passage and driving the pump, the air in the atmosphere flows into the primary side in the housing through the air inflow passage, and air bubbles are generated. Occur. The generated air bubbles hit the filter, and bubbling cleaning of the filter is performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention.
Or, it demonstrates based on FIG. 1 to 4 both show a circuit structure of a water purifier, and this water purifier mainly has a pump 21 for sucking up and supplying water from a reservoir and a filter 22 for filtering the water supplied from the pump 21. It is an item. The filter 22 is housed in a housing 23, and the inside of the housing 23 is partitioned into a primary side into which water supplied from the pump 21 flows and a secondary side filled with water filtered by the filter 22. Pump 21
A first valve 24 and a strainer 25 for preventing suction of large dust are attached to the suction side of the.

A passage 26 is provided between the discharge side of the pump 21 and the primary side of the housing 23, and a second valve 27 and a third valve 28 are provided in the middle of the passage 26. One end of a passage 29 is connected to the secondary side in the housing 23, a faucet 30 is attached to the other end of the passage 29, and a fourth valve 31 is provided in the middle of the passage 29.

A passage 32 is branched from between the second valve 27 and the third valve 28 in the passage 26.
A drain port 33 is provided at the tip of the second passage 2, and a fifth valve 34 is provided in the middle of the passage 32. Also, the passage 26
The other end of the passage 35, which is an air inflow passage having one end open to the atmosphere, is connected between the third valve 28 and the housing 23 in the above. And a sixth valve 36 is provided.

A passage 37, which is a negative pressure generating passage, is provided between the primary side of the housing 23 and the suction side of the pump 21. In the middle of the passage 37, a seventh valve 38, which is an opening / closing switching unit that switches between opening and closing the passage 37, is provided. A passage 39 is branched from between the housing 23 and the seventh valve 38 in the passage 37, the tip of this passage 39 is open to the atmosphere, and an eighth valve 40 is provided in the middle of the passage 39.

The first to eighth valves used in this embodiment are all opened / closed by electric control.

In such a configuration, FIG. 1 shows a state in which water is sucked from the reservoir by the pump 21 is filtered by the filter 22 and the filtered purified water is supplied from the faucet 30 at the time of water supply. During this water supply, the first valve 24, the second valve 27, the third valve 28, and the fourth valve 3
1 is opened and the other valves are closed to drive the pump 21. The water sucked up by the pump 21 is filtered by passing from the primary side of the filter 22 to the secondary side.

When the amount of dirt attached to the filter 2 reaches a predetermined amount, the filter 2 is washed. The cleaning of the filter 2 is performed by back pressure cleaning and bubbling cleaning in two stages.

FIG. 2 shows the state at the time of the back pressure cleaning in the first stage. During this back pressure cleaning, the second valve 27 and the fifth valve
The valve 34 and the seventh valve 38 are opened, the other valves are closed, and the pump 21 is driven. This allows passage 3
7 and the primary side in the housing 23 become negative pressure. Then, by opening the fourth valve 31 at the timing when the negative pressure reaches the maximum value, the atmospheric pressure is applied from the faucet 30 and the water in the passage 29 and the housing 23 is caused to flow backward. At this time, water flows backward from the secondary side of the filter 22 to the primary side, and the dirt attached to the primary side of the filter 22 is removed.

FIG. 3 shows a state at the time of bubbling cleaning in the second stage. During this bubbling cleaning, pump 2
While driving No. 1, the fourth valve 31 is closed and the sixth valve 36 is opened from the state of FIG. That is, the second valve 27, the fifth valve 34, the sixth valve 36, and the seventh valve 38 are opened, the other valves are closed, and the pump 21 is driven. As a result, air in the atmosphere flows into the housing 23 from the primary side through the passage 35, and bubbles are generated in the housing 23. The generated bubbles hit the primary side of the filter 22, and the bubbling cleaning of the filter 22 is performed. The bubbles obtained by bubbling and cleaning the filter 22 are exhausted from the drain port 33 through the inside of the passage 37 and the inside of the passage 32 as shown by arrows.

Further, during the bubbling cleaning, the inside of the housing 23 is in a negative pressure state due to the driving of the pump 21, so that the bubbles generated in the housing 23 become large, and the large bubbles hit the filter 22 to cause the filter 22. It becomes easier to remove dirt.

FIG. 4 shows a state at the time of draining the water accumulated on the primary side in the housing 23 after the back pressure cleaning and the bubbling cleaning are completed. During this drainage,
The eighth valve 40, the third valve 28, and the fifth valve 34 are opened, the other valves are closed, and the pump 21 is stopped. As a result, the water on the secondary side in the housing 23 containing the dirt separated from the filter 22 passes through the passage 26 and the passage 32.
It flows inside and is drained from the drain port 33.

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on. The same parts as those described with reference to FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, a manual valve is used instead of the first to eighth valves that are opened and closed by the electric control described in the first embodiment. The first valve 41 provided on the suction side of the pump 21 has a function of intermittently sucking up water from the reservoir and a passage 37 for generating a negative pressure in the housing 23 at the time of back pressure cleaning of the filter 22.
And a function as an opening / closing switching unit for switching between opening and closing. The second valve 4 provided on the discharge side of the pump 21
2 has a function of intermittently supplying the water sucked up by the pump 21 to the filter 22, and a function of opening and closing the drain port 33. A third valve 43, which is an opening / closing switching unit that switches between opening and closing of the passage 35, is provided in the middle of the passage 35 for allowing air to flow from the atmosphere into the housing 23 during bubbling cleaning of the filter 22. Filter 22
A fourth valve 44 that opens and closes the passage 29 is provided in the middle of the passage 29 that guides the purified water filtered in step 1 to the faucet 30. A fifth valve 45 is provided in the middle of the passage 39.

In such a structure, the water purifier having an inexpensive structure can be obtained by making the first to fifth valves 41 to 45 manual.

[0029]

Effects of the Invention] According to the filter cleaning process of water purification equipment of the invention according to claim 1, open the closed switching unit is switched to an open state to communicate with the negative pressure generating passage, by driving the pump, the housing When a negative pressure is applied to the primary side and the negative pressure acting on the primary side in the housing reaches a predetermined value, it communicates with the secondary side in the housing and passes through a passage filled with filtered liquid to the atmosphere. By connecting to
The liquid filled in the passage and the secondary side in the housing is caused to flow back from the secondary side of the filter to the primary side by atmospheric pressure, and the back pressure cleaning of the filter can be performed. Therefore,
Since this washing machine does not require a compressor for back pressure washing of the filter, it is possible to reduce the size and weight of the filter, and further, it is possible to have an inexpensive structure.
The maintenance work can be reduced.

According to the second aspect of the invention, by switching the opening and closing switching section in an open state to communicate with the air inlet passage, by driving the pump, primary housing the air in the atmosphere through the air inflow passage Flow into the side to generate bubbles in the housing for bubbling cleaning of the filter. Therefore, this washing machine does not need a compressor for performing bubbling washing of the filter, so that it is possible to reduce the size and weight of the washing machine, and to have an inexpensive structure, and to reduce the maintenance work. can do.

[Brief description of drawings]

FIG. 1 shows a water purifier according to a first embodiment of the present invention,
It is a circuit diagram which shows the state at the time of the supply of purified water.

FIG. 2 is a circuit diagram showing a state of the filter at the time of back pressure cleaning.

FIG. 3 is a circuit diagram showing a state during bubbling cleaning of the filter.

FIG. 4 is a circuit diagram showing a state at the time of draining water containing dirt after cleaning.

FIG. 5 is a circuit diagram showing a structure of a washing machine according to a second embodiment of the present invention.

FIG. 6 is a circuit diagram showing a structure of a conventional washing machine.

[Explanation of symbols]

21 pumps 22 filters 23 housing 35 Air inflow passage 36,43 open / close switching unit 37 Negative pressure generation passage 38,41 Open / close switching unit

Claims (2)

(57) [Claims] 1. A filter cleaning method for a water purifier, wherein unfiltered liquid is supplied by a pump, and the unfiltered liquid supplied by the pump is filtered by passing it from a primary side to a secondary side of a filter housed in a housing. In the method , the first bar provided on the suction side of the pump during back pressure cleaning.
And the discharge side of the pump and the primary side of the housing
And a third valve provided in a passage between the housing and the housing.
Close the fourth valve provided on the secondary side in the
The first bar on the primary side of the housing and on the suction side of the pump.
Opening and closing the negative pressure generation passage that communicates with the downstream side of the lube
The opening / closing switching portion, the discharge side of the pump, and the third valve.
A fifth valve provided in a passage branched from between
Open the pump to drive the negative pressure
A negative pressure is applied to the generation passage and the primary side in the housing, and then the fourth valve is opened to thereby filter the filter.
A method for cleaning a filter of a water purifier, characterized in that the atmospheric pressure is applied from the secondary side to the primary side of the water purifier. 2. At the time of bubbling cleaning, the first valve and
Closed and the fourth valve and the third valve, opening and closing the negative pressure generating passage air inlet communicating path for communicating the primary side and the atmosphere open <br/> closed switch to open and close the switching unit in the housing Off
Open the open / close switching unit and the fifth valve for replacement
The pump is driven so that the air in the atmosphere is
It flows from the primary side into the housing through the air inflow passage.
The method for cleaning a filter of a water purifier according to claim 1 , wherein bubbles are generated .