KR20090026405A - Automatic washing system for sand-filter - Google Patents

Automatic washing system for sand-filter Download PDF

Info

Publication number
KR20090026405A
KR20090026405A KR1020070091345A KR20070091345A KR20090026405A KR 20090026405 A KR20090026405 A KR 20090026405A KR 1020070091345 A KR1020070091345 A KR 1020070091345A KR 20070091345 A KR20070091345 A KR 20070091345A KR 20090026405 A KR20090026405 A KR 20090026405A
Authority
KR
South Korea
Prior art keywords
pipe
sand
sand filter
way valve
circulation pump
Prior art date
Application number
KR1020070091345A
Other languages
Korean (ko)
Inventor
윤홍용
Original Assignee
윤홍용
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 윤홍용 filed Critical 윤홍용
Priority to KR1020070091345A priority Critical patent/KR20090026405A/en
Publication of KR20090026405A publication Critical patent/KR20090026405A/en

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
    • B01D24/4673—Regenerating the filtering material in the filter by moving the filtering element using rotary devices or vibration mechanisms, e.g. stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2101/00—Types of filters having loose filtering material
    • B01D2101/04—Sand or gravel filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/08—Regeneration of the filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/16—Valves

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

An automatic washing system of a sand filter is provided to prevent generation of additional personnel expenses and improve washing efficiency. An automatic washing system of a sand filter comprises the followings: sand(51) filled in the sand filter; a screw(61) installed inside of the sand stirring the sand; and a speed reduction motor(60) rotating the screw, installed outside the sand filter. When the sand filter is backwashed, contaminants fall off the sand easily by rotating screw and stirring the sand.

Description

Automatic washing system for sand filter

The present invention relates to a sand filtration system for purifying water in a large water tank (bath) installed in a facility such as a bath. The automatic washing system of the sand filter, which is to be automatically performed but further comprises a rotary screw for stirring the sand filled in the sand filter, and implements the automatic cleaning control using the same so that the washing efficiency is greatly improved.

As is well known, the sand filter fills the inside of the filter tank so that the water is filtered (purified) through the sand filter when the bath water is purified, and when the inside of the filter is washed, the water is flowed back to remove dirt from the filter. How to wash.

However, in the conventional sand filter washing method, since sand is filled in the filter tank, the sand is hardened like dirt (foreign material) due to the load (pressure) of the sand.

In this case, even if a strong backwash, that is, a backwash using a high water pressure from the bottom of the sand filter upwards, there was a limit in washing the contaminated dirt with the sand.

Therefore, conventionally, the lid of the sand filter tank is opened, and the filled sand is taken out and washed manually. As a result, such a cleaning method has been highlighted as a problem that the labor cost is further increased as well as the washing operation is cumbersome.

Therefore, the present invention has been made in order to solve the above problems, the object of the present invention is to clean the sand filter as well as the purification function through the sand filter, the rotation to stir the sand filled in the sand filter The present invention provides a sand filter automatic washing system further comprising a screw, and implementing automatic washing control using the same, so that washing efficiency is greatly improved, and additional costs are not generated due to washing.

In order to achieve the above object, the present invention provides a sand filter system for purifying fresh water in a bath tank, wherein sand is filled in the sand filter, and a screw for stirring sand is further installed in the sand filter. The screw is configured to rotate in conjunction with a reduction motor installed on the outside of the sand filter, by driving the reduction motor during the reverse washing of the sand filter, so that the screw is rotated, contaminants by the stirring of the sand Characterized in that it is easily separated from the sand.

In addition, the present invention is configured so that the drain pipe of the bath tub is connected to the circulation pump, the outlet side of the circulation pump is branched and connected to one side pipe of the first three-way valve and the second three-way valve, the other side pipe of the first three-way valve Is connected to the upper part of the sand filter via the first pipe and the other waste pipe is connected to the other pipe, and the other pipe of the second three-way valve is connected to the lower part of the sand filter through the second pipe and to the other pipe A water supply pipe for supplying water to a bathroom tank is connected, and sand is filled in the sand filter, and a screw inserted into the sand through the reduction motor is rotated so that the sand is agitated, and sand is placed on the sand filter. A pressure switch for detecting the pressure in the filter tank is installed;

After a certain period of time after the purge operation is repeatedly controlled to perform automatic backwashing inside the sand filter for a certain time,

In the washing operation, the driving of the circulating pump is first stopped, and the screw is rotated by driving the reduction motor, and the first three-way valve is switched so that the first pipe and the waste drain pipe are opened to each other, and the second three-way valve is connected to the circulation pump. Converting the outlet pipe and the second pipe to be opened to each other, and driving the circulation pump;

In the purge operation, the circulation pump is first stopped, the deceleration motor is stopped, and the driving of the screw is stopped. The first three-way valve is switched so that the first pipe and the outlet pipe of the circulation pump are opened to each other, and the second three-way valve is It is characterized in that the two pipes and the water supply pipe is switched to be opened to each other, and the control to drive the circulation pump.

Therefore, the present invention, as well as to perform the purifying function through the sand filter further includes a rotary screw for stirring the sand filled in the sand filter, by implementing the automatic cleaning control using the same, the washing efficiency is very improved and at the same time washing It is a useful invention that no additional cost (labor cost) is added.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an automatic washing system of a sand filter according to an embodiment of the present invention.

As shown, in the automatic washing system of the present invention, the drain pipe 21 of the bath tub 10 is connected to the circulation pump 20, the outlet side of the circulation pump 20 is branched to the first three way It is configured to be connected to one side pipe of the valve 30 and the second three-way valve 40, the other side pipe of the first three-way valve 30 is connected to the upper portion of the sand filter 50 via the first pipe (31). At the same time, the other waste pipe 32 is connected to the other pipe, the other pipe of the second three-way valve 40 is connected to the lower portion of the sand filter 50 via the second pipe 41 and at the same time the other pipe A water supply pipe 42 for supplying water to the bath tub 10 is connected, and sand 51 is filled in the sand filter 50, and is inserted into the sand 51 through a reduction motor 60. The screw 61 is rotated so that the sand 51 is agitated, and the pressure in the sand filter tank is applied to the top of the sand filter 50. A pressure switch 70 for detecting is installed.

In addition, the sand filter 50 is formed with a sand inlet through which the sand 51 can be introduced and a sand outlet through which sand can be discharged to the outside, and a lid is formed at the top, but the transparent member (synthetic resin: It is formed to see the inside (acrylic).

Such automatic washing system of the sand filter of the present invention purifies the water in the bath water tank 10, but after a certain time to stop the operation and washing to remove the contaminants accumulated in the sand filter 50 for a predetermined time Operation is repeatedly performed, and a circuit configuration for controlling the driving thereof will be described with reference to FIG. 2.

2 is a block diagram of a control circuit according to an exemplary embodiment of the present invention.

As shown, the drive circuit of the automatic sand cleaning system of the present invention, the setting and operation unit 80, the control unit 90, the display and warning unit 100, the circulation pump drive unit 110, the first three-way valve drive unit 120, the second three-way valve driving unit 130 and the reduction motor driving unit 140.

The setting and operation unit 80 is provided with an operation start / end key, a function and a setting key, and inputs an operation start or end of the system or various driving time settings.

The control unit 90 is a central processing unit that incorporates a control program according to the present invention and controls the entire circuit. The control unit 90 collectively controls the automatic washing system of the sand filter according to the key signal input from the setting and operation unit 80.

The display and warning unit 100 displays the angle operation state according to the output of the control unit 90 (lamp lighting) or outputs an error signal when the overpressure inside the sand filter 60 is generated and emits a warning sound (buzzer drive). .

The circulation pump driver 110 drives the circulation pump 20 according to the output of the controller 90.

The first three-way valve driving unit 120 switches and drives the first three-way valve 30 according to the output of the control unit 90. During the normal filtration (purification) operation, the water drawn from the circulation pump 20 is removed. The valve is switched to drive only to flow into one pipe 31, and the valve is switched to drive water so that water drawn from the first pipe 31 flows only into the waste water drainage pipe 32 when the sand filter 50 is washed.

The second three-way valve driving unit 130 switches and drives the second three-way valve 40 according to the output of the control unit 90. During the normal filtration (purification) operation, water drawn from the second pipe 41 The valve is switched and driven so as to flow only into the water supply pipe 42 for supplying water to the bath tub 10, and when the sand filter 50 is washed, the water introduced from the circulation pump 20 flows only into the second pipe 41. The valve is switched to drive.

The reduction motor driving unit 140 drives the reduction motor 60 in accordance with the output of the control unit 90. When the reduction motor 60 is driven, the screw 61 in the sand filter 50 interlocks therewith. ) Rotates the sand 51 is mixed, and at this time, as the washing (backwashing) operation is performed, foreign matters caught in the sand 51 can be easily discharged. This will be described later in detail.

Thus, the control method of this invention comprised is demonstrated with reference to FIG.

In the control method according to the present invention, when the operation is started, the process of washing the interior of the sand filter 50 (S10), the process of determining whether the operation is terminated during the cleaning (S20), and the determination process (S20). If the operation end command is input in step (S30) to stop all the driving, and if the operation stop command is not input in the determination step (S20) and the process of determining whether the internal pressure of the sand filter 50 is more than the set value (S40) And, if the internal pressure of the sand filter 50 in the determination process (S40) or more than the set value, the step of stopping the driving of the circulation pump 20 and outputting an error display (S50), and the determination process (S40) In the case that the internal pressure of the sand filter 50 is less than the set value, the process of determining whether a predetermined time (2 minutes) has elapsed (S60), and if the predetermined time has not elapsed in the determination process (S60), the washing process ( S10) and the predetermined time is If the elapsed time, the process of purifying the water in the bath (10) normally (S70), the process of determining whether the operation is finished after the purification operation (S80), and the operation termination command is input in the determination process (S80) If not, the process proceeds to stop all the drive (S30), and if the operation stop command is not input in the determination process (S80) and the process of determining whether the internal pressure of the sand filter 50 is more than the set value (S90), and If the internal pressure of the sand filter 50 is greater than or equal to a predetermined value in the determination process (S90), the operation of the circulation pump 20 is stopped and an error indication is output (S50). In the determination process (S40), If the internal pressure of the sand filter 50 is less than the set value, it is determined whether a predetermined time (4 hours) has elapsed, and if the predetermined time has not elapsed, the flow returns to the purification process (S70) and the predetermined time has elapsed. To turn consists of a process (S100) to proceed to a washing step (S10).

Here, the washing process (S10) is a step (S11) of stopping the driving of the circulation pump 20, driving (rotating) the reduction motor 60 (S12), and the first and second three-way valve ( Simultaneously switching 30, 40 to drive in a washing operation (S13), and the step of driving the circulation pump 20 (S14).

In addition, the purification process (S70) is a step (S71) of stopping the driving of the circulation pump 20, a step (S72) of stopping the driving of the reduction motor 60, and the first and second three-way valve (30, Simultaneously switching 40 to drive in a purge operation (S73), and driving the circulation pump 20 (S74).

Looking at the cleaning process (S10) and the purification process (S70) of the present invention, it can be seen that the washing operation or purifying operation through a predetermined step, which simultaneously drives or opens the circulation pump and the three-way valve, This is to prevent the occurrence of water hammer.

The overall operation of the present invention configured as described above will be described with reference to FIGS. 4A and 4B.

First, FIG. 4A is a block diagram showing the flow of water in the purification operation, and FIG. 4B shows the flow of water in the sand filter washing operation. The dotted line here indicates that no water flows.

When power is supplied to the system and an operation start command is input through the setting and operation unit 80, the control unit 90 outputs a washing operation control.

That is, the stop command of the circulation pump 20 is output to the circulation pump driving unit 110. Therefore, the circulation pump 20 stops (step S11).

Then, the driving command of the reduction motor 60 is output to the reduction motor driving unit 140. Therefore, the reduction motor 60 is driven, the screw 61 is linked to it is rotated (step S12).

Then, the valve switching command of the first and second three-way valves 30 and 40 is output to the first and second three-way valve driving units 120 and 130. Therefore, the first three-way valve 30 is switched so that the first pipe 31 and the waste drain pipe 32 are opened to each other, the second three-way valve 40 is the discharge pipe and the second pipe (41) of the circulation pump 20 ) Are switched to be opened to each other (step S13).

Then, the driving command of the circulation pump 20 is output to the circulation pump driver 110. Therefore, the circulation pump 20 is driven (step S14).

Referring to this washing operation with reference to Figure 4b, the water discharged through the drain pipe 21 in the bath water tank 10 is the circulation pump 20 → the second three-way valve (40) → the second pipe (41) → The sand filter 50 is discharged through the first pipe 31, the first three-way valve 30, and the waste water drainage pipe 32 (S10).

Therefore, the water introduced into the sand filter 50 through the second tube 41 at a constant water pressure while the sand 51 is stirred by the rotation of the screw 61 to easily remove contaminants stuck to the sand 51. It is discharged to the outside through the first pipe 31 and the waste drain pipe (32).

In such a washing operation, the controller 90 detects a key signal input through the setting and operation unit 80 to determine whether the operation is terminated, and stops all the driving if an operation termination command is input (S20, S30). process)

However, if the operation termination command is not input, the washing operation is continued and the pressure inside the sand filter 50 input through the pressure switch 70 is detected, and it is determined whether the value is equal to or greater than the set value (step S40). )

When the internal pressure of the sand filter 50 is determined to be greater than or equal to a predetermined value in the determination process (S40), the driving of the circulation pump 20 is stopped and an error indication and a warning sound are sounded through the display and warning unit 100. (S50 course).

However, when the internal pressure of the sand filter 50 is less than the set value in the determination process (S40), it is determined whether a predetermined time (2 minutes) has elapsed, and if the predetermined time has elapsed, the washing process is ended, and the bath tank 10 Purification control is performed to purify the water inside normally.

That is, the controller 90 outputs a stop command of the circulation pump 20 to the circulation pump driver 110. Therefore, the circulation pump 20 stops (step S71).

Then, the deceleration motor driver 140 outputs a stop command of the deceleration motor 60. Therefore, the reduction motor 60 is stopped, so that the screw 61 linked thereto does not rotate (step S72).

Then, the valve switching command of the first and second three-way valves 30 and 40 is output to the first and second three-way valve driving units 120 and 130. Therefore, the first three-way valve 30 is switched so that the outlet pipe of the first pipe 31 and the circulation pump 20 is opened to each other, the second three-way valve 40 is the second pipe 41 and the water supply pipe 42 Are switched to be opened to each other (step S73).

Then, the driving command of the circulation pump 20 is output to the circulation pump driver 110. Therefore, the circulation pump 20 is driven (step S74).

Referring to FIG. 4A, the water discharged through the drain pipe 21 from the water bath 10 is a circulation pump 20 → a first three-way valve 30 → a first pipe 31 → sand. Through the filter 50 → the second pipe 41 → the second three-way valve 40 → the water supply pipe 42, it is again supplied to the bath water tank 10 (step S70).

Therefore, the water introduced into the sand filter 50 through the first pipe 31 at a constant water pressure passes through the sand 51 in the filter, and after the filtration operation is performed to filter foreign matter, clean water is transferred to the second pipe 41. And it is repeated to be supplied to the bath tub 10 again through the water supply pipe (42).

In such a purge operation, the controller 90 detects a key signal input through the setting and operation unit 80 to determine whether to end the operation, and stops all driving if an operation termination command is input (S80, S30 course)

However, if the operation termination command is not input, the washing operation is continued and the pressure inside the sand filter 50 input through the pressure switch 70 is detected, and it is determined whether the value is equal to or greater than the set value (S90). )

When the internal pressure of the sand filter 50 is determined to be greater than or equal to a predetermined value in the determination process (S90), the driving of the circulation pump 20 is stopped and an error indication and a warning sound are sounded through the display and warning unit 100. (S50 course).

However, when the internal pressure of the sand filter 50 is less than the set value in the determination process (S40), it is determined whether a predetermined time (4 hours) has elapsed, and if the predetermined time has elapsed, the purification process is terminated and returned to the washing process. Repeatedly performing (S10) (step S100).

1 is a block diagram of an automatic washing system of a sand filter according to an embodiment of the present invention,

2 is a control circuit block diagram according to an embodiment of the present invention;

3 is a control flowchart according to the present invention;

Figure 4a is a block diagram of an automatic washing system of the sand filter in the normal purifying operation according to an embodiment of the present invention,

Figure 4b is a block diagram of an automatic washing system of the sand filter during the washing operation according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: bath tank 20: circulation pump

21: drain pipe 30: first three-way valve

31: Hall 1 32: Sewage drainage pipe

40: second three-way valve 41: second pipe

42: water pipe 50: sand filter

51: sand 60: reduction motor

61: screw 70: pressure switch

80: setting and operation unit 90: control unit

100: display and warning unit 110: circulating pump drive unit

120: first three-way valve driving unit 130: second three-way valve driving unit

140: reduction motor drive unit

Claims (3)

In the sand filter system for purifying the fresh water in the bath tank (10), Sand 51 is filled in the sand filter 50, and a screw 61 for stirring the sand is further installed in the sand, and the screw 61 is disposed outside the sand filter 50. By rotating in conjunction with the reduction motor 60 is installed, When the sand filter 50 is backwashed, the screw 61 is rotated by driving the reduction motor 60 so that the contaminants are easily separated from the sand by stirring the sand. Cleaning system. The drain pipe 21 of the bath tub 10 is connected to the circulation pump 20, and the outlet side of the circulation pump 20 is branched so that one side pipe of the first three-way valve 30 and the second three-way valve 40 is formed. Is configured to be connected to, the other side pipe of the first three-way valve 30 is connected to the upper portion of the sand filter 50 via the first pipe 31 and at the same time the other waste pipe 32 is connected to the other side pipe, The other side pipe of the second three-way valve 40 is connected to the lower portion of the sand filter 50 via the second pipe 41 and the other side pipe is provided with a water supply pipe 42 for supplying water to the bath tub 10. Is connected, the sand 51 is filled in the sand filter 50, the screw 61 is inserted into the sand 51 through the reduction motor 60 is rotated so that the sand 51 is stirred A pressure switch 70 is installed above the sand filter 50 to sense the pressure in the sand filter 50 tank; After a certain period of time after the purifying operation is repeated control so that the automatic backwash inside the sand filter 50 is made for a certain time, In the washing operation, the driving of the circulation pump 20 is first stopped, and the reduction motor 60 is driven to rotate the screw 61. The first three-way valve 30 includes the first pipe 31 and the waste water drainage pipe. (32) is switched to open each other, the second three-way valve (40) is switched so that the outlet pipe and the second pipe (41) of the circulation pump 20 to each other, and drives the circulation pump (20); In the purge operation, the circulation pump 20 is first stopped, and the reduction motor 60 is stopped to stop the drive of the screw 61. The first three-way valve 30 includes the first pipe 31 and the circulation pump ( The outlet pipes 20 of 20 are switched to be opened to each other, and the second three-way valve 40 is switched to open the second pipe 41 and the water supply pipe 42 to each other, and performs control to drive the circulation pump 20. Automatic washing system of a sand filter, characterized in that. The method of claim 2, It is a central processing unit that includes an operation start / end key, a function and a setting key for inputting an operation start or end or various operation time settings and a control unit 80, and a predetermined control program to control the entire circuit. The control unit 90 controls the automatic washing system of the sand filter in accordance with the setting and the key signal input from the operation unit 80, and displays the operation state of the angle according to the output of the control unit 90 (lamp lighting) or , The display and warning unit 100 which outputs an error signal upon overpressure inside the sand filter 60 and emits a warning sound (buzzer drive) and the circulation driving the circulation pump 20 according to the output of the control unit 90. The pump driving unit 110 and the first three-way valve (30) is driven in accordance with the output of the control unit 90, during the normal filtration (purification) operation, the water drawn from the circulation pump 20 is the first pipe ( Switch drive so that it flows only When the sand filter 50 is washed, the first three-way valve driving unit 120 drives the valve so that water introduced from the first pipe 31 flows only into the waste water drainage pipe 32, and the control unit 90. The second three-way valve 40 is switched and driven according to the output of the water. In the normal filtration (purification) operation, the water drawn from the second pipe 41 is provided only to the water supply pipe 42 for supplying water to the bath 10. A second three-way valve driving unit 130 for switching the valve so as to flow, and switching the valve so that the water flowing from the circulation pump 20 flows only to the second pipe 41 when the sand filter 50 is washed. And, automatic washing system of the sand filter, characterized in that it further comprises a reduction motor drive unit 140 for rotationally driving the reduction motor (60) in accordance with the output of the control unit (90).
KR1020070091345A 2007-09-10 2007-09-10 Automatic washing system for sand-filter KR20090026405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020070091345A KR20090026405A (en) 2007-09-10 2007-09-10 Automatic washing system for sand-filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020070091345A KR20090026405A (en) 2007-09-10 2007-09-10 Automatic washing system for sand-filter

Publications (1)

Publication Number Publication Date
KR20090026405A true KR20090026405A (en) 2009-03-13

Family

ID=40694347

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020070091345A KR20090026405A (en) 2007-09-10 2007-09-10 Automatic washing system for sand-filter

Country Status (1)

Country Link
KR (1) KR20090026405A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101509615B1 (en) * 2013-03-29 2015-04-07 윤성구 Sand filter
CN107694167A (en) * 2017-10-31 2018-02-16 尚川（北京）水务有限公司 A kind of sand filter water collection device and sand filter
KR20190020384A (en) 2017-08-21 2019-03-04 윤성구 Multi complex Sand Filter
KR20190050075A (en) 2017-11-02 2019-05-10 윤성구 Filter Device
KR20190052350A (en) 2017-11-08 2019-05-16 윤성구 Multi complex Sand Filter
KR20200005279A (en) 2018-07-06 2020-01-15 윤성구 Waste water filtering system
KR20200016475A (en) 2018-08-07 2020-02-17 윤성구 Horizontal type Sand Filter device
KR20210004048A (en) 2019-07-03 2021-01-13 윤성구 Driving device for sand filter
KR102317948B1 (en) 2021-04-01 2021-10-26 김재선 Water purification method and apparatus of public bathhouse

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101509615B1 (en) * 2013-03-29 2015-04-07 윤성구 Sand filter
KR20190020384A (en) 2017-08-21 2019-03-04 윤성구 Multi complex Sand Filter
CN107694167A (en) * 2017-10-31 2018-02-16 尚川（北京）水务有限公司 A kind of sand filter water collection device and sand filter
KR20190050075A (en) 2017-11-02 2019-05-10 윤성구 Filter Device
KR20190052350A (en) 2017-11-08 2019-05-16 윤성구 Multi complex Sand Filter
KR20200005279A (en) 2018-07-06 2020-01-15 윤성구 Waste water filtering system
KR20200016475A (en) 2018-08-07 2020-02-17 윤성구 Horizontal type Sand Filter device
KR20210004048A (en) 2019-07-03 2021-01-13 윤성구 Driving device for sand filter
KR102317948B1 (en) 2021-04-01 2021-10-26 김재선 Water purification method and apparatus of public bathhouse

Similar Documents

Publication Publication Date Title
KR20090026405A (en) Automatic washing system for sand-filter
KR100530806B1 (en) Water filtering apparatus with suction flushing type screen
CN203400540U (en) Turnover plate filter tank with upward flow function
CN104711824A (en) Water-saving washing machine and control method
US9604264B2 (en) Washing device for water treatment apparatus and washing method thereof
KR20170130544A (en) Control method of washing machine and washing machine
CN103908832A (en) Multi-stage sewage treatment recycling system of suction-type sewer scavenger
CN114275854A (en) Positive and negative flushing water purification system and control method thereof
JP4892517B2 (en) Water purifier
JP2008132431A (en) Filter apparatus
KR101109014B1 (en) A Pipe Connector for Automatic Back Washing of Filter
CN105420989B (en) Washing machine and control method of washing machine with circulating water filtering system
JPH10128317A (en) Bath water sterilizing apparatus equipped with washing function in bath water circulator
CN215251807U (en) Washing machine
CN114191877A (en) Control method and control device for forward and backward washing water purification system
JP2016175012A (en) Water treatment device
JP2007021361A (en) Water purifier
CN208933059U (en) Multi-functional water decanter for biochemical wastewater treatment pond
KR200432244Y1 (en) A Water Purification&#39;s Reverse Cleansing Device
CN220863695U (en) Brush dish cleaning equipment
KR970001188Y1 (en) Apparatus for filtering
JP5821349B2 (en) Water treatment facility control equipment
CN216259570U (en) Building engineering water supply and drainage filter equipment
CN216778114U (en) Water quality treatment equipment with backflushing function
JP2001321616A (en) Water purifying system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E601 Decision to refuse application