JP4061264B2 - Hydraulic automatic backwash method and apparatus - Google Patents

Description

  The present invention relates to a kind of automatic hydraulic backwashing method and apparatus, and more particularly, to a method and apparatus for carrying out backwashing and dirt discharging operations during operation of a screen net using a set of pumps having a simple structure.

  With the advancement of science and technology and the emergence of environmental protection, the government has made stricter sewage and wastewater management. For this reason, most facilities that generate sewage during the production process are required to install sewage treatment facilities according to regulations. The sewage treatment facility performs steps such as filtration, decomposition and neutralization step by step according to the type and characteristics of the sewage, and then discharges sewage that meets the discharge standard to the sewer. In the sewage treatment facility described above, filtration is the first basic related work, which removes large substances in the sewage first, eliminates substances that are not compatible with the subsequent treatment process first, and reduces the addition of the entire facility. . This filtration step is also effective in protecting the normal operation of the subsequent equipment, and is therefore an indispensable process and device. As shown in FIG. 1, the known filter automatic dirt collecting machine includes a filter A, a motor B, a transmission belt C, and a collection tank D, of which the motor B drives the transmission belt C, and the transmission belt C Is installed on the other side of the filter A, the filter A is provided with a hollow portion corresponding to the direction of movement of the transmission belt C, and the transmission belt C is provided with a plurality of protrusions E corresponding to the hollow portion. The protruding portion E penetrates the filter A and protrudes from the surface, and the collection tank D is provided at the end of the transmission belt C in the traveling direction. With such a structure, a relatively large granular substance in the sewage treated by the filter A is captured on the surface of the filter A, and then the transmission belt C advances the filter A holding the filth on the surface by the protrusion E. The filth is dropped into the collection tank D, thus achieving the functions of filtration and automatic cleaning. However, such a filtration equipment is expensive to install, complicated equipment and solid matter is accumulated, so that an operator must periodically inspect and clean the collection tank D. The difficulty level increases. In addition, the complex mechanical structure is not suitable for locations close to the sea (for example, remote islands and coastal industrial processing areas) because salty air forms a very corrosive action on the mechanical structure and shortens its service life. It is. For this reason, improvement is required.

  The main object of the present invention is to provide a kind of automatic hydraulic backwashing method, in which the screen net in the filtration tank is installed in an inclined manner, and the direction of inclination and the direction of drainage and sewage flow are opposite to each other. When the filtration mechanism is executed on the screen net, the filth stays on the downward surface of the screen net, and the detection of the liquid height in the filtration tank by a timer or a liquid level gauge is used. When the above phenomenon occurs and the liquid level rises to the set position, the step of cleaning the screen net in the reverse direction by starting the backwashing device is executed.

  Another object of the present invention is to provide a kind of automatic hydropower backwashing method and apparatus, which automatically performs the function of screen net backwashing using only a pump and a timer or a liquid level gauge. The structure is simple, convenient for maintenance, cost can be reduced, and it has the function of preventing corrosion.

  Another object of the present invention is to provide a kind of automatic hydraulic backwashing method and apparatus, in which the filth adhering to the screen net is washed with liquid and concentrated from the sewage discharge hole at the bottom of the filtration tank. It is assumed that it can be left in the pond and digested, thereby eliminating the need for artificial periodic cleaning and effectively reducing labor.

The invention of claim 1
(A) sending raw water into a filtration tank;
(B) filtering the raw water and retaining the dirt on the lower surface of the screen net placed diagonally;
(C) activating the pump, spraying the liquid above the screen net, cleaning the dirt adhering to the screen net, and introducing a part of the liquid provided by the pump into the weight body weight body;
(D) when the weight of the weight becomes larger than the pulling force of the sealing means, the sealing means of the sewage discharge hole is opened, and the sewage from which the filth has been washed away is discharged;
(E) a step of stopping the pump after the backwash time has been reached, continuously discharging the liquid in the weight body to reduce the weight, and closing the sealing means of the sewage discharge hole;
The hydraulic automatic back washing method is characterized by comprising the above steps.
The invention according to claim 2 is the automatic hydraulic backwashing method according to claim 1, wherein a timer is used for determining the timing for starting the pump in step (c). .
The invention according to claim 3 is the automatic hydraulic backwashing method according to claim 1, wherein the detection by the automatic detection means is used to determine the timing of starting the pump in the step (c). It is a washing method.
The invention of claim 4 is a hydraulic automatic backwashing device comprising a filtration tank, a plurality of screen nets, a pump and a control device,
The filtration tank has a water inlet hole and a water outlet hole, and at least one sewage discharge hole having a sealing means is provided at the bottom of the tank. A water injection pipe is provided above the filtration tank, and a bottom surface of the water injection pipe is provided. A plurality of water injection holes are provided,
The plurality of screen nets are installed in a filtration tank so that the upper side thereof is inclined toward the direction of the water inlet, and receives the cleaning liquid for the screen net provided by the water injection pipe.
The pump provides a source of water for the irrigation pipe;
The control device can open and close the sealing means of the sewage discharge hole, and controls the pump operation. The control device includes a drive unit and a sealing means opening mechanism, and the sealing means opening mechanism is a weight body. The weight body is composed of a hollow weight body and a control valve. Openings are provided at the upper end and the lower end of the hollow weight body, and the upper end opening is used for inflow of the cleaning liquid of the plurality of screen nets. Is connected to the control valve wall, and the amount of water flowing out from the opening at the lower end is controlled by the control valve.
According to a fifth aspect of the present invention, there is provided the automatic hydraulic backwashing apparatus according to the fourth aspect, wherein the sealing means opening mechanism is connected to the sealing means by a rope.
The invention according to claim 6 is the automatic hydraulic backwashing device according to claim 4, wherein the drive unit is a timer.
The invention according to claim 7 is the hydraulic automatic backwashing device according to claim 4, wherein the drive unit is a liquid level gauge.
The invention according to claim 8 is the automatic hydraulic backwashing device according to claim 7, wherein the liquid level gauge is installed in the vicinity of the screen net on one side close to the outlet hole. .
The invention according to claim 9 is the automatic hydraulic backwashing device according to claim 4, wherein the screen nets have different mesh sizes.
The invention of claim 10 is the automatic hydraulic backwashing device according to claim 9, wherein the screen net near the water inlet is made larger than the meshes of other screen nets. Yes.
The invention of claim 11 is the hydraulic automatic backwashing device according to claim 4, characterized in that a sewage discharge hole is provided below each screen net.
The invention of claim 12 is the hydraulic automatic backwashing device according to claim 4, wherein the pump is a submersible pump.

  The hydropower automatic backwashing method and apparatus of the present invention includes an adjustable weight for a screen net installed obliquely in a filtration tank, and a mechanism for backwashing the screen net by automatic detection or on-time pump activation. Combined with the opening time control of the sewage discharge hole at the bottom of the filtration tank by the body, the structure is simple, the production cost is low, the maintenance is easy, and the corrosion prevention effect is provided. Suitable for installation in high areas. In addition, the present invention is not described in publications distributed before the filing of the application, and is not publicly used, and thus has novelty.

  FIG. 2 is a flowchart of the hydraulic automatic backwashing method of the present invention. The hydropower automatic backwashing method of the present invention (a) sends raw water into a filtration tank, (b) filters raw water, and retains filth on the lower surface of the screen net, (c) uses a timer. Start the pump at a fixed time, or detect the water level in the filtration tank with automatic detection means (for example, a liquid level gauge) and start the pump in a timely manner. (D) Use the pump to move the liquid from top to bottom. (E) The weight of the weight is introduced to the weight body of the water weight, and at the same time, a part of the liquid provided by the pump is introduced into the weight body of the water weight. When it becomes larger than the pulling force of the sealing means, the sealing means of the sewage discharge hole opens and the sewage from which the filth has been washed away is discharged. (F) The pump is stopped after the backwash time has been reached. Continuing to drain liquid to reduce weight and weight Close sealing means wastewater discharge holes amount to greater than the tensile force of the sealing means.

  3, 4 and 5 are a front view, a plan view and a side view of an embodiment of an apparatus for carrying out the above-described method of the present invention. The hydraulic automatic backwashing device of the present invention is composed of a filtration tank 1, at least one screen net 2, a pump 3 and a control device 4, and a water inlet 11 is provided on one side of the filtration tank 1 and water is discharged on the other side. A hole 12 is provided, and the screen net 2 is installed in the filtration tank 1 so that the upper side is inclined toward the water inlet hole 11, and at a position corresponding to the lower side of each screen net 2 on the tank bottom of the filtration tank 1, A sewage discharge hole 13 having a sealing means 131 is installed, a water injection pipe 14 is installed above the filtration tank 1, and one end of the water injection pipe 14 is connected to the pump 3 to provide a sufficient liquid to the water injection pipe 14. In addition, at least one water injection hole (not shown) is provided in the water injection pipe 14 at a position corresponding to the upper side of each screen net 2. In addition, the control device 4 is connected to the sealing means 131 that opens and closes the sewage discharge hole 13 and can automatically start the pump 3.

  The aforementioned control device 4 is further composed of a drive unit 41 and a sealing means opening mechanism 42 (FIG. 5), and the sealing means opening mechanism 42 is connected to the sealing means 131 of each sewage discharge hole 13 using a rope 421. Achieving the function of opening synchronously. In addition, the drive unit 41 activates the pump 3, and the drive unit 41 is a timer or an automatic detection unit (for example, a liquid level gauge), which is the part closest to the water outlet 12 in the filtration tank 1. Near the screen net 2.

  Due to the above-described structural design, when sewage flows into the filtration tank 1 from the water inlet 11, filth in the sewage stays on the lower surface of the screen net 2 due to the screen net 2 whose installation direction is opposite to the direction in which the sewage flows. . When the backwashing mechanism works by setting the time or starting the pump 3 by the automatic detection unit, the liquid is ejected from the water injection hole (not shown) of the water injection pipe 14 and the backwashing operation is performed on the screen net 2 located below. As a result, the filth staying on the screen net 2 is peeled and dropped, and then the filth removed by the sealing means opening mechanism 42 is discharged from the sewage discharge hole 13, and the sealing means 131 is closed. Complete the expression cycle. The sludge discharged from the sewage discharge hole 13 can be used for subsequent processing in the pipeline. In addition, sludge is stored in other processing equipment such as a sedimentation tank, so that no extra sludge cleaning work is required, and it is not necessary to clean the collection tank at a fixed time manually by a known technique. Therefore, the present invention achieves a good automation effect and labor cost reduction effect.

  Further, in the apparatus of the present invention, the plurality of screen nets 2 installed in the filtration tank 1 can be combined with screen nets 2 having different mesh sizes according to the necessity of actual operation, and a screen net having a large mesh size. By arranging 2 near the water inlet hole 11, the function of step filtration can be achieved. In addition, since the liquid level gauge is installed in a certain amount of dirt in the screen net 2 and the filtration efficiency is lowered, the water level rapidly rises. When the final screen net 2 is reached, the clogging is fixed to a certain level by a liquid level gauge, which is read and the pump 3 is activated to perform the backwash process.

  Further, in the structure of the present invention, the sealing means opening mechanism 42 for opening the sewage discharge hole 13 by pulling the sealing means 131 with the rope 421 can be a traditional power mechanism such as a motor or an electromagnetic valve. The water weight structure of the embodiment (FIG. 5) can be used. This water weight structure is composed of a hollow weight body 422 and a control valve 423. Among them, openings 424 and 425 are provided at the upper and lower ends of the weight body 422, the opening 424 at the upper end is used for the inflow of liquid provided by the pump 3, and the opening 425 at the lower end of the weight body 422 is connected to the control valve 423. In addition, the amount of water flowing out from the lower opening 425 is controlled by the control valve 423. At the same time that the screen net 2 is backwashed by the operation of the pump 3, the liquid starts to flow into the hollow weight body 422, the amount of water flowing into the weight body 422 is fixed, and the control valve 423 is located below the weight body 422. As a result, the amount of water discharged is controlled, and after the pump 3 is started, the inside of the weight body 422 gradually fills up because the amount of water received is larger than the amount of water discharged, and the weight increases due to the accumulated water in the weight body 422. When the sealing force 131 becomes larger than the pulling force for closing the sealing means 131, the sealing means 131 is pulled to open the sewage discharge hole 13, and the sludge that has washed the screen net 2 flows into the sewage discharge hole 13. When the backwash time is finished, the pump 3 stops operating and water supply is stopped. At this time, the weight 422 is not replenished with more liquid than the opening 424 at the upper end, but the liquid in the weight 422 is lower at the lower end. Since the weight of the sewage discharge hole 13 is gradually reduced and the weight becomes smaller than the pulling force for closing the seal means 131 of the sewage discharge hole 13, the seal means 131 of the sewage discharge hole 13 is automatically closed. The dirt backwash flow is completed. As can be seen from the above description, by adjusting the amount of water discharged from the control valve 423 below the weight body 422, the start timing of the water weight structure and the length of time for controlling the sealing means 131 of the sewage discharge hole 13 can be reduced. Can be adjusted.

The present invention has the following advantages over the prior art.
1. Fully automated: The introduction of sewage, automatic backwashing of screen net accumulated matter from filtration, and the retained matter dropped in the backwash process can be discharged into the sludge tank through the sewage discharge hole. Compared to the need for a high level of automation, labor costs can be saved.
2. Simple structure: Among the structures described in the present invention, the mechanical structure is slightly a pump and a timer or a liquid level gauge, so that the structure is simpler than the known structure, and the production and manufacturing costs are lower than the known technique. (About 1/7 of the known technology). In addition, maintenance at a later date is easy and simple.
3. Wide range of application: The structure of the present invention is simple, and the pump used can also adopt a submerged pump, so there is no risk of erosion of salt or other substances, and it has a good corrosion prevention effect, For this reason, it is very suitable for use in remote islands or coastal areas.

  The above embodiments do not limit the scope of the present invention, and any modification or alteration of details that can be made based on the present invention shall fall within the scope of the claims of the present invention.

It is a well-known structure display figure. It is a flowchart of the hydraulic automatic backwashing method of this invention. It is a front view of the hydraulic automatic backwashing apparatus of this invention. It is a top view of the hydraulic automatic backwashing apparatus of this invention. It is a side view of the hydraulic automatic backwashing apparatus of this invention.

Explanation of symbols

A Filter B Motor C Transmission belt D Collection tank E Protrusion part 1 Filtration tank 11 Inlet hole 12 Outlet hole 13 Sewage discharge hole 131 Sealing means 14 Pouring pipe 2 Screen net 3 Pump 4 Controller 41 Drive unit 42 Sealing means opening mechanism 421 Rope 422 Weight 423 Control valve 424 Opening 425 Opening

Claims (12)

(A) sending raw water into a filtration tank;
(B) filtering the raw water and retaining the dirt on the lower surface of the screen net placed diagonally;
(C) activating the pump, spraying the liquid above the screen net, cleaning the dirt adhering to the screen net, and introducing a part of the liquid provided by the pump into the weight body weight body;
(D) when the weight of the weight becomes larger than the pulling force of the sealing means, the sealing means of the sewage discharge hole is opened, and the sewage from which the filth has been washed away is discharged;
(E) a step of stopping the pump after the backwash time has been reached, continuously discharging the liquid in the weight body to reduce the weight, and closing the sealing means of the sewage discharge hole;
A hydraulic automatic backwashing method comprising the above steps.   2. The automatic hydraulic backwashing method according to claim 1, wherein a timer is used to determine the timing for starting the pump in step (c).   2. The automatic hydraulic backwashing method according to claim 1, wherein the detection by the automatic detection means is used for determining the timing for starting the pump in the step (c). It is a hydraulic automatic backwashing device equipped with a filtration tank, a plurality of screen nets, a pump and a control device,
The filtration tank has a water inlet hole and a water outlet hole, and at least one sewage discharge hole having a sealing means is provided at the bottom of the tank. A water injection pipe is provided above the filtration tank, and a bottom surface of the water injection pipe is provided. A plurality of water injection holes are provided,
The plurality of screen nets are installed in a filtration tank so that the upper side thereof is inclined toward the direction of the water inlet, and receives the cleaning liquid for the screen net provided by the water injection pipe.
The pump provides a source of water for the irrigation pipe;
The control device can open and close the sealing means of the sewage discharge hole, and controls the pump operation. The control device includes a drive unit and a sealing means opening mechanism, and the sealing means opening mechanism is a weight body. The weight body is composed of a hollow weight body and a control valve. Openings are provided at the upper end and the lower end of the hollow weight body, and the upper end opening is used for inflow of the cleaning liquid of the plurality of screen nets. Is connected to the control valve wall, and the amount of water flowing out from the opening at the lower end is controlled by the control valve. In hydraulic automatic backwash device according to claim 4, characterized in that said sealing means opening mechanism is connected to the sealing means with ropes, hydraulic automatic backwash device. 5. The automatic hydraulic backwashing apparatus according to claim 4, wherein the drive unit is a timer. 5. The automatic hydraulic backwashing device according to claim 4, wherein the drive unit is a liquid level gauge.   8. The automatic hydraulic backwashing device according to claim 7, wherein the liquid level gauge is installed in the vicinity of the screen net on one side close to the water outlet. 5. The automatic hydraulic backwashing apparatus according to claim 4, wherein each screen net has a different mesh size . 10. The automatic hydraulic backwashing device according to claim 9, wherein the mesh of the screen net near the water inlet is made larger than the meshes of the other screen nets. 5. The automatic hydraulic backwashing apparatus according to claim 4, wherein a sewage discharge hole is provided below each screen net. 5. The automatic hydraulic backwashing device according to claim 4, wherein the pump is a submersible pump.

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