CN108626415B - A float type lift valve for filter tank - Google Patents

Abstract

A kind of float-type lift valve in filter tank, it is equipped with the inlet and outlet pipes for entering filter tank and backwashing water outflow filter tank for water to be filtered vertically in filter tank, valve seat is equipped in the upper port of the inlet and outlet pipes, the spool for moving up and down and being opened and closed with control valve can be driven by driving mechanism by being equipped with above valve seat, the floating drum that can be suspended in water is arranged in the upper end of inlet and outlet pipes, the open upper end of floating drum forms intake-outlet, the inner sidewall of floating drum and the lateral wall of inlet and outlet pipes are slidably and sealingly connected with, floating drum is set to float up and down with the variation of water level in filter tank along inlet and outlet pipes, to change the height of floating drum upper end intake-outlet.The height of intake-outlet also changes with liquid level and is changed, and is adapted always with filter tank liquid level in backwash drainage procedure, prevents drainage from outflowing with water.It backwashes more efficient, can reduce backwash number, shorten backwashing time, improve the service efficiency in filter tank.

Description

A float type lift valve for filter tank

technical field

The invention relates to a filter tank valve, in particular to a water valve used for filter tank water to be filtered and backwashing drainage.

Background technique

In the water purification process, filter filtration is an important part. During the filtration process, the impurities filtered out of the water will continue to accumulate in the filter material layer. Excessive accumulation will lead to unqualified effluent quality and lower water production efficiency. Therefore, it is necessary to remove the accumulated impurities in the filter material layer by backwashing. During the backwashing process, water or air flow reversely impacts the filter material layer, so that the impurities deposited in the filter material layer are loosened, released and suspended in the water, and then discharged with the water to achieve the purpose of cleaning. During the backwashing process, not only the impurities will be washed out from the filter material layer, but also part of the filter material will be suspended in the water under the impact. If the backwash drainage method is improper, the filter material will be discharged with the water, resulting in loss.

At present, the backwash outlets of most filters are fixedly installed. If the installation position is too high, there will be a lot of turbid water left in the filter after backwashing, and the number of backwashing needs to be increased accordingly. If the installation location If it is too low, the filter material suspended in the water is too close to the drain, and the loss of filter material will increase during the drainage process.

In addition, since the liquid level in the filter tank is constantly changing during the drainage process, when the drainage starts, the liquid level is higher than the drain port, and water and impurities can be discharged from the drain port, and when the liquid level is below the drain port, the water is discharged stop. The height of the liquid level at the initial drainage determines the duration of continuous drainage. If the liquid level is too high at the initial stage, the suspended filter material in the water will be easily discharged together with impurities, resulting in increased loss of filter material. If the liquid level is too low at the initial stage and the drainage time is too short, it will be difficult to fully discharge the impurities, and the quality of the effluent water will not meet the standard, which will increase the number and time of flushing, and fail to achieve the purpose of energy saving and water saving.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problem that the height of the outlet of the existing filter tank is fixed, cannot adapt to the change of the liquid level of the filter tank, and the loss of the filter material is large during drainage, and provides a float type lift valve for the filter tank.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a buoy type lift valve for the filter tank, in which a valve is vertically arranged for the water to be filtered to enter the filter tank and the backwash water to flow out of the filter tank Inlet and outlet pipes, the upper port of the inlet and outlet pipes is provided with a valve seat, and above the valve seat is a valve core that can be driven up and down by the driving mechanism to control the opening and closing of the valve. The upper end of the buoy is opened to form a water inlet and outlet, and the inner wall of the buoy is in sliding and sealed connection with the outer wall of the water inlet and outlet pipe, so that the buoy can float up and down along the water inlet and outlet pipe with the change of the water level in the filter tank, so as to change the height of the water inlet and outlet at the upper end of the buoy .

The water inlet and outlet at the upper end of the buoy are in the shape of a trumpet expanding outward.

A floating body capable of floating on the water surface is fixed on the buoy.

Four floating bodies are evenly distributed in the circumferential direction of the buoy.

The buoyancy of the buoy floating in the water makes the upper edge of the water inlet and outlet at the upper end of the buoy below the water surface, for example, 5-15cm below the water surface.

The spool is driven to move up and down by a push rod motor.

The valve seat and the valve core have tapered sealing surfaces that are in sealing fit with each other.

The water inlet and outlet pipes are arranged in the center of the filter tank, and the lower end thereof is connected to the interface of the side wall of the filter tank through a pipe.

The lower end of the buoy is provided with a limiting device for limiting its maximum lifting height.

The beneficial effects of the present invention are: the buoy set on the upper end of the water inlet and outlet pipe can float in the water, and can float up and down with the change of the water level in the filter tank, so that the height of the water inlet and outlet at the upper end of the buoy can also change with the change of the liquid level. During the drainage process, it is always adapted to the liquid level of the filter to prevent the filtered water from being lost with the water. The liquid level in the initial stage of filter backwash drainage can be raised to a higher level without worrying about the loss of filter material, so the backwash efficiency is higher, the number of backwash times can be reduced, the backwash time can be shortened, and the use efficiency of the filter can be improved.

The buoy floating method can automatically adapt to the change of the liquid level, and the set height difference between the water inlet and outlet and the liquid surface can always be maintained. This automatic adaptation method does not need a series of cumbersome operations such as liquid level measurement, control system calculation, and driving mechanism action. Without delay, not only is the accuracy higher, but also does not require a complicated control system, and the simplicity and stability are better.

Description of drawings

Fig. 1 is a schematic diagram of the installation structure of the buoy type lifting valve of the present invention in the filter tank.

Fig. 2 is a schematic diagram of the position change of the buoy after the water level of the filter shown in Fig. 1 drops.

Fig. 3 is a schematic diagram of an embodiment in which four floating bodies are arranged on the buoy.

Marks in the figure: 1. filter tank, 2. water inlet and outlet pipes, 3. valve seat, 4. driving mechanism, 5. valve core, 6. buoy, 601, floating body, 7. water inlet and outlet, 8. filter material layer, 9 , Clean water outlet, 10, backwash pipe.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. The specific content listed in the following embodiments is not limited to the technical features necessary for the technical problem to be solved by the technical solution described in the claims. Meanwhile, the enumeration is only a part of the present invention, not all of the embodiments.

As shown in Figure 1, the buoy type lifting valve of the present invention is arranged in the filter tank, and it comprises a vertically arranged inlet and outlet water pipe 2, and this inlet and outlet water pipe 2 is used for the water to be filtered to enter the filter tank, and is also used in the backwashing process. The center serves as a drain for backwash water to flow out of the filter. The water inlet and outlet pipes 2 are preferably arranged at the center of the filter tank 1, so that impurities on the liquid surface can be collected and discharged toward the center during backwashing and drainage. Of course, it is also feasible to arrange the water inlet and outlet pipes at off-center positions, such as on one side of the filter tank. Correspondingly, the impurities on the liquid surface need to be accumulated and discharged to the side of the filter.

The lower end of the water inlet and outlet pipe 2 is connected to the outside of the filter tank through a pipeline, such as an interface connected to the side wall of the filter tank. At this interface, the water supply pipeline for the filtered water and the drainage pipeline for backwashing muddy water are connected through corresponding valves and pipelines. When the filter tank is normally filtering water, the valve of the drainage pipeline is closed, and the water to be filtered is passed into the filter tank by the water supply pipeline through the water inlet and outlet pipe 2. During the backwashing process of the filter, the water supply pipeline is closed, and the impurity on the liquid surface of the filter communicates with part of the water to be discharged through the water inlet and outlet pipe 2 to the drainage pipeline.

A valve seat 3 is provided in the upper port of the water inlet and outlet pipe 2, and a valve core 5 capable of moving up and down is provided above the valve seat 3. The valve seat 3 and the valve core 5 form a valve for controlling the opening or closing of the water inlet and outlet pipes 2 . The specific form of the valve seat 3 and the valve core 5 can be selected according to the needs. In this embodiment, the form of a cone valve is selected. The valve seat 3 and the valve core 5 have conical sealing surfaces that are mutually sealingly matched. The shown spool 5 is driven up and down by the driving mechanism 4, such as a push rod motor, to control the opening and closing of the valve. According to the specific valve form, a sling, a screw, etc. can also be used to drive the up and down movement.

In order to solve the problem that the outlet adapts to the change of the liquid level of the filter, a buoy 6 that can be suspended in the water is sleeved on the upper end of the water inlet and outlet pipe 2 , and the upper end of the buoy 6 is opened to form a water inlet and outlet 7 . The inner side wall of the buoy 6 is directly slidable with the outer side wall of the water inlet and outlet pipe 2, and is sealed. Therefore, the water inlet and outlet pipe 2 that is sleeved with the buoy 6 forms a telescopic form at the upper end. The size of the sliding friction between the buoy 6 and the water inlet and outlet pipe 2 should not hinder the rise of the buoy 6 under the buoyancy of the water, nor should it hinder the decline of the buoy under the action of gravity after the liquid level drops. Therefore, the buoy 6 is actually suspended in the water, and can float up and down along the water inlet and outlet pipe 2 with the change of the water level in the filter tank 1 . As the buoy 6 floats up and down, the height of the water inlet and outlet 7 at its upper end also changes up and down correspondingly, and this change is always adapted to the change of the liquid level.

As shown in Figure 1, when the water level in the filter tank rises, the buoy 6 rises to a higher position along the inlet and outlet pipes 2 under the buoyancy of the water. And along with the discharge of water, as shown in Figure 2, when the water level drops in the filter tank, the buoy 6 also correspondingly descends along the inlet and outlet pipes 2. But the water inlet and outlet 7 keep a relatively fixed position with the water surface all the time.

When the filter tank equipped with the buoy lift valve of the present invention is in normal operation, the water supply pipeline of the water to be filtered is connected with the water inlet and outlet pipes 2, and the valve core 5 rises under the drive of the driving mechanism 4, so that the valve is opened. The water to be filtered enters the filter tank from the water inlet and outlet 7, and after being filtered by the filter material layer in the filter tank, it is discharged from the clean water outlet on the wall below the filter material layer.

As the filtration progresses, the impurities deposited in the filter material layer gradually increase. When there are too many impurities hindering the filtration and the liquid level rises to the predetermined value or the turbidity of the discharged clean water is detected to be greater than the predetermined value, it can be judged that the filter material layer needs to be backwashed. At this moment, the water inlet with filtered water and the water outlet of purified water are stopped, and the drive mechanism 4 drives the spool 5 to descend and shut off the water inlet and outlet pipes. Start the backwash procedure, and use the backwash pipe below the filter layer for backwash air and/or water flushing. With the progress of backwashing, impurities are washed out from the filter material layer, and the liquid level in the filter tank gradually rises. The buoy 6 also rises thereupon, making the water inlet and outlet 7 maintain a relatively fixed position with the water surface all the time. When the liquid level reaches the set high point, stop the backwash air flushing and water flushing. The driving mechanism 4 drives the spool 5 to rise, and the valve is opened so that the muddy water enters the water inlet and outlet pipe 2 through the water inlet and outlet 7, and is discharged through the drainage pipeline.

During the drainage process, since the relative position between the water inlet and outlet 7 and the water surface is always fixed, and the relative position is accurately calculated according to the thickness of the drained water layer and the buoyancy of the buoy through backwashing experiments, the upper edge of the water inlet and outlet 7 is always on the water surface the next suitable height. Therefore, the height difference between the liquid level and the upper edge of the water inlet and outlet 7 will not be too large, which can prevent the filter material from entering the water inlet and outlet pipe 2 with the water flow and cause loss of the filter material. At the same time, the height difference will not be too small, which can ensure that the impurities on the liquid surface can be smoothly discharged with the water.

Adopting the floating mode of the buoy can make the water inlet and outlet 7 automatically adapt to the change of the liquid level, and the set height difference can always be maintained between the water inlet and outlet and the liquid surface. The liquid level in the initial stage of the backwash drainage of the filter can be raised to a higher height without worrying about the loss of the filter material due to the excessive height difference between the liquid level and the water inlet and outlet 7 during drainage, thus reducing the number of backwashing times and shortening the Backwashing time, improve the efficiency of the filter. This automatic adaptation method does not need a series of cumbersome operations such as liquid level measurement, control system calculation, and driving mechanism action. Without delay, not only is the accuracy higher, but also does not require a complicated control system, and the simplicity and stability are better.

The water inlet and outlet 7 at the upper end of the buoy 6 expands outwards in the shape of a trumpet, and the nozzle increases after expansion, so that impurities on the liquid surface can be collected and discharged therefrom.

The buoy 6 can be made of a material that itself has a larger buoyancy, so that it can be suspended in water. It is also possible to adopt relatively firm but heavier materials such as metals to make the main body of the buoy 6, and to fix a floating body 601 that can float on the water surface with a larger buoyancy at its periphery. The greater buoyancy of the floating body 601 may be brought by its material itself, or it may be realized by structural means, such as a hollow structure, such as a hollow floating ball. The number and specific installation methods of the floating bodies 601 are set as required. For example, it is directly fixed on the outer wall of the cylindrical main body, or on a connecting support rod extending outward from the cylindrical main body. In the embodiment shown in FIG. 3 , four spherical floating bodies 601 are fixed in the form of connecting support rods, and the four spherical floating bodies 601 are evenly distributed along the circumferential direction of the buoy 6 to ensure uniform buoyancy around the buoy 6 .

A limit device is set at the lower end of the buoy 6, which can keep the buoy 6 sleeved on the water inlet and outlet pipe 2, so as not to break away due to too high rise, and meanwhile, the maximum lifting height can also be limited by the limit device. The specific form of the limiting device can be in the form of an inwardly protruding bump arranged on the inner side of the lower end of the buoy 6, and cooperates with the fixed blocking member on the outer side of the upper end of the water inlet and outlet pipe 2 to play a limiting role. It can also be limited by setting guide grooves and sliders. Which form to use can be selected according to specific needs. Similarly, a limit device can also be provided on the upper end of the buoy 6 to limit the maximum stroke of its downward movement, and the setting method is similar to the limit device at the lower end.

In the backwashing drainage stage, the water inlet and outlet 7 need to be below the water surface in the filter tank, so that the impurities on the liquid surface can be discharged smoothly. The specific floating height of the water inlet and outlet 7 is determined by the buoyancy of the buoy 6 in the water, and the buoyancy of the buoy 6 can be adjusted by selecting the type, size, quantity, etc. of the buoyant material. Through the study of the motion law of the filter material in the water and the thickness of the impurity layer on the water surface during the backwashing process, it is determined through calculation that the upper edge of the water inlet and outlet 7 at the upper end of the buoy 6 is 5-15 cm below the water surface, and the optimum is 10 cm. The water inlet and outlet 7 can always be kept below the liquid level in the backwashing drainage process, which not only enables the impurities to be fully discharged, but also prevents the filter material from flowing into the water inlet and outlet pipe 2 with the water to the greatest extent, reducing the loss of the filter material.

The above descriptions of the specific embodiments are only used to help understand the technical concept and core idea of the present invention. Although specific preferred embodiments have been used to describe and illustrate the technical solutions, they should not be interpreted as an explanation of the present invention itself. limit. Those skilled in the art may make various changes in form and details without departing from the technical concept of the present invention. These easily conceivable changes or substitutions shall all fall within the protection scope of the present invention.

Claims (10)

1. a kind of float-type lift valve in filter tank, it is characterised in that: be equipped with one vertically in filter tank (1) and be used for water to be filtered Into the inlet and outlet pipes (2) in filter tank and backwashing water outflow filter tank, valve seat is equipped in the upper port of the inlet and outlet pipes (2) (3), the spool (5) that moves up and down and be opened and closed with control valve can be driven by driving mechanism (4) by being equipped with above valve seat (3), into The upper end of outlet pipe (2) is arranged with the floating drum (6) that can be suspended in water, and the open upper end of floating drum (6) forms Inlet and outlet water Mouth (7), the inner sidewall of floating drum (6) and the lateral wall of inlet and outlet pipes (2) are slidably and sealingly connected with, and make floating drum (6) can be with filter tank (1) The variation of interior water level and float up and down along inlet and outlet pipes (2), to change the height of floating drum (6) upper end intake-outlet (7), make to pass in and out The mouth of a river keeps a relatively fixed position with the water surface always.

2. a kind of float-type lift valve in filter tank as described in claim 1, it is characterised in that: floating drum (6) upper end Intake-outlet (7) is horn-like in expanding outwardly.

3. a kind of float-type lift valve in filter tank as described in claim 1, it is characterised in that: solid on the floating drum (6) Surely there is the floating body (601) that can be swum on the water surface.

4. a kind of float-type lift valve in filter tank as claimed in claim 3, it is characterised in that: the circumference of the floating drum (6) There are four being uniformly distributed on direction floating body (601).

5. such as a kind of described in any item float-type lift valves in filter tank of claim 1-4, it is characterised in that: the floating drum (6) the buoyancy size of floating in water makes the upper edge of floating drum (6) upper end intake-outlet (7) be in the water surface or less.

6. such as a kind of described in any item float-type lift valves in filter tank of claim 5, it is characterised in that: the floating drum (6) The buoyancy size of floating in water makes the upper edge of floating drum (6) upper end intake-outlet (7) be in 5-15cm of the water surface or less.

7. a kind of float-type lift valve in filter tank as described in claim 1, it is characterised in that: the spool (5) is by pushing away Bar motor, which drives, to move up and down.

8. a kind of float-type lift valve in filter tank as claimed in claim 1 or 7, it is characterised in that: the valve seat (3) and Spool (5) has the conical seal (contact) face for sealing against each other cooperation.

9. a kind of float-type lift valve in filter tank as described in claim 1, it is characterised in that: the inlet and outlet pipes (2) Center in filter tank (1) is set, and lower end is connected by pipeline with the interface of filter tank side wall.

10. a kind of float-type lift valve in filter tank as described in claim 1, it is characterised in that: the lower end of the floating drum (6) Equipped with the limiting device for limiting its maximum lifting height.