CN1471994A - Backwash screen filter - Google Patents

Abstract

The invention discloses a filter, in particular to an automatic cleaning filter used in a micro-irrigation system. The technical solution includes a water outlet 1, a water inlet 2, a filter screen 4, a valve 7, a sewage outlet 8, and a housing 14, and the feature is that a rotating dirt collection pipe 12 leading to the sewage outlet 8 is provided in the filter screen 4, and in the The rotating dirt collecting pipe 12 is provided with a dirt absorbing channel 11 communicating with it; the dirt absorbing channel 11 can be at a centrifugal angle α; the rotating dirt collecting tube 12 can be connected with a rotating power source. The device has the advantages of reasonable structural design, good cleaning effect, high degree of automation, low price and energy saving.

Description

Backwash screen filter

technical field

The invention relates to a filter, in particular to a filter used in a micro-irrigation system.

Background technique

The filter is an important part of the micro-irrigation system. Its main function is to filter the impurities and dirt in the irrigation water so that the water quality meets the requirements of the micro-irrigation system. There are three main types of filters commonly used in agricultural irrigation: mesh filters, sand filters, and water-sand separators. Among them, the mesh filter is the most commonly used one.

The principle of mesh filter filtration is that in the mesh filter, there is a filter screen as a filter screen. When dirty water passes through the filter screen, the impurities in the water are trapped on the screen, and the clean water flows into the downstream irrigation pipeline.

The cleaning of the screen filter generally adopts the following methods:

(1) The first method is to remove the filter screen from the filter and wash it manually; the advantage is that the filter structure is simple and the cost is low. The disadvantage is that it needs to be shut down and manually operated. In many cases, the filter is damaged and the system is blocked because it cannot be cleaned in time.

(2) The second is to use the automatic controller and solenoid valve to automatically open the drain valve on the filter at regular intervals or according to the pressure difference between the inlet and outlet of the filter to flush the dirt out of the filter. The disadvantage of this axial flushing method is that part of the dirt trapped on the net is difficult to flush away.

(3) The third type, in order to improve the filtering effect, a brush is installed in the filter screen. During the washing process, the brush automatically rotates under the action of the electric drive device to scrub the filter screen. The disadvantage of this method is that it is difficult for some sticky It is difficult to brush off the organic matter on the net, and the washing effect is poor.

(4) The fourth type, in order to achieve flushing while working, people use several mesh filters in parallel, some filters work, and some filters backwash. This not only increases the cost, but also complicates the operation.

Contents of the invention

The object of the present invention is to provide a backwashing screen filter, which does not require manual cleaning and can be cleaned automatically.

The technical scheme adopted in order to achieve the purpose of the present invention includes: including water outlet 1, water inlet 2, filter screen 4, valve 7, sewage outlet 8, shell 14, it is characterized in that, in filter screen 4, is provided with leading to sewage discharge The rotary dirt collection pipe 12 of the mouth 8 is provided with a dirt adsorption channel 11 on the rotary dirt collection tube 12, and the dirt adsorption channel 11 communicates with the rotary dirt collection tube 12; the dirt adsorption channel 11 can be centrifugal Angle α; the rotating dirt collecting pipe 12 may be connected with a rotating power source.

Another technical solution adopted in order to achieve the purpose of the present invention includes: comprising a water outlet 1, a water inlet 2, a filter screen 4, a valve 7, a sewage outlet 8, and a housing 14, and it is characterized in that, in the filter screen 4, there are An axially movable rotary dirt collection pipe 12 leading to the sewage outlet 8, on which a dirt adsorption channel 11 is arranged, and the dirt adsorption channel 11 communicates with the rotary dirt collection tube 12; The dirt adsorption channel 11 can be at a centrifugal angle α; the rotating dirt collecting pipe 12 can be connected with a rotating power source.

A two-way spiral fit is provided between the rotating dirt collecting pipe 12 and its bearing 13 in the second type of backwashing screen filter.

In the above-mentioned backwashing screen filter, the centrifugal sewage discharge pipe 9 can be connected to the end of the rotating dirt collection pipe 12, and the two ends of the centrifugal sewage discharge pipe 9 are respectively provided with an outlet.

The above-mentioned backwashing screen filter may also include a differential pressure sensor and a controller 6, and at this time, the valve 7 is a solenoid valve.

The rotating power source in the above-mentioned backwashing mesh filter is the motor 15 .

In the above-mentioned backwashing screen filter, a coarse filter screen 3 is provided between the water inlet 2 and the filter screen 4 .

The dirt adsorption channel 11 in the above-mentioned backwash net filter is a sheet or tube structure, and it can have one or more.

Due to the setting of the rotating dirt collection pipe 12 and the dirt adsorption channel 11, a backwashing mode is formed, which is completely different from the traditional axial washing or brushing method, and the dirt attached to the filter can be removed from the filter. The other side of the net is rinsed away, and with this flushing method, the dirt is more easily washed away. Due to the centrifugal angle α of the dirt adsorption channel 11, that is, the design of the centrifugal structure, the rotating dirt collection pipe 12 automatically rotates under the action of water pressure, and the dirt adsorption channel 11 automatically scans the filter screen without supporting rotating power equipment. One filter can filter and backwash at the same time. Therefore, the present invention has the advantages of reasonable structural design, good cleaning effect, high degree of automation, low price and energy saving.

Description of drawings

Fig. 1 is a kind of structural representation of backwash screen filter of the present invention;

Fig. 2 is a structural schematic view of the backwashing screen filter of the present invention when the rotating dirt collecting pipe can move axially.

Fig. 3 is a structural schematic diagram of the control part of the backwashing mesh filter of the present invention when a motor is configured.

FIG. 4 is a partially enlarged view of B in FIG. 2 .

Fig. 5 is a sectional view along line A-A of Fig. 1 .

specific implementation plan

As shown in Figure 1, 1 is the water outlet of the filter, 2 is the water inlet, 3 is the coarse filter, 4 is the filter, 5 is the retained dirt, 6 is the differential pressure sensor and controller, and 7 is the electromagnetic filter. Valve, 8 is the sewage outlet, 9 is the centrifugal sewage pipe, which is the reaction centrifugal water outlet of sewage, there is a water outlet at both ends of the pipe, and the water outlet is located on the opposite side of the pipe, 10 is the dirt collection chamber, 11 It is a dirt adsorption channel, which is a hollow flow channel or pipe with a certain eccentric angle, and 12 is a rotating dirt collection pipe, which is placed in the filter screen 4 through a bearing 13, communicates with the dirt adsorption channel 11, and is discharged through centrifugal sewage. Pipe 9 and dirt collection chamber 10 lead to sewage outlet 8, and 14 is shell. In this embodiment, the dirt adsorption channel 11 is a two-piece structure, and their inlets are distributed on the entire axis of the filter screen 4. In this embodiment, no rotating power source is configured, and the dirt adsorption channel 11 is at a centrifugal angle. α (see Fig. 5), like this, just can produce rotating centrifugal force when sewage rushes into dirt adsorption channel 11, thereby realizes the rotation of rotating dirt collecting pipe 12, makes dirt adsorption channel 11 scan the whole filter screen.

As shown in Figure 2, the length of the rotating dirt collecting pipe 12 is relatively long, which can ensure the normal progress of its axial movement. cooperate to achieve. Since the rotating dirt collecting pipe of the backwashing mesh filter of the present invention can move axially, the entrance of the dirt adsorption channel 11 need not distribute the entire axis of the filter screen 4, so that the dirt adsorption channel 11 can be made smaller , not only saving materials, but also reducing resistance. Of course, the axial movement of the rotating dirt collecting pipe 12 can also be realized in other ways, such as a cam-link structure.

As shown in Figure 3, 15 is an electric motor, which can replace the centrifugal structure design of the dirt adsorption channel 11, and serve as the rotating power source of the dirt collecting pipe 12.

The operating principle and working process of the device of the present invention are: the dirt adsorption assembly in the filter is the core of the present invention, and the dirt adsorption assembly is composed of dirt adsorption channel (or pipe or mouth) 11, rotary dirt collection tube 12, four parts such as centrifugal blowdown pipe 9, bearing 13 are formed (as Fig. 1, Fig. 2, Fig. 3). When the pressure difference inside and outside the filter screen reaches the preset value (perceived by the pressure difference sensor), the sewage outlet 8 will be automatically opened (realized by operating the solenoid valve 7 with an existing controller in the market), since the sewage outlet 8 is opened Finally, the pressure outside the filter screen 4 is much higher than the pressure in the dirt adsorption assembly, and the water outside the filter screen 4 will enter the dirt from the outside of the filter screen 4 at a high speed through the filter screen 4 under the action of the water pressure difference. adsorption channel 11, and bring the dirt trapped inside the filter screen 4 into the centrifugal dirt adsorption channel 11, due to the eccentricity of the centrifugal dirt adsorption channel 11, under the action of the water pressure, the centrifugal dirt adsorption channel 11, together with the rotating dirt collection pipe 12, rotates automatically, and the centrifugal adsorption channel scans the entire filter screen, absorbing the dirt trapped inside the filter screen 4 and entering the dirt collection chamber 10 through the centrifugal sewage discharge pipe 9 (also called the reaction centrifugal outlet), and passing through The sewage outlet 8 discharges the dirt. The purpose of the reaction centrifugal outlet is to enhance the rotation of the dirt adsorption assembly. When the pressure difference inside and outside the filter screen reaches the set value of the filter screen, the solenoid valve 7 is closed, the rotating dirt adsorption assembly stops working, and the flushing process is completed.

The working principle of the rotating dirt collecting pipe with two-way thread fit is different from that of the above-mentioned non-threaded rotating dirt collecting pipe: under the action of water pressure, the dirt adsorption assembly rotates automatically, and the dirt is collected in the rotating Under the action of the two-way screw fit at both ends of the tube 12, the dirt adsorption assembly moves from left to right and then from right to left (or from top to bottom and then from bottom to top) while rotating, and the dirt adsorption tube 11 will scan The whole filter 4.

The rotation of the dirt adsorption assembly can utilize the centrifugal force described above, and can also be driven by a motor (as shown in Figure 3).

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions of the present invention shall fall within the scope of the claims of the present invention.

Claims (8)

1. A backwash net filter, comprising a water outlet (1), a water inlet (2), a filter screen (4), a valve (7), a sewage outlet (8), and a housing (14), is characterized in that, A rotating dirt collection pipe (12) leading to the sewage outlet (8) is provided in the filter screen (4), and a dirt adsorption channel (11) is arranged on the rotating dirt collection pipe (12). The adsorption channel (11) communicates with the rotating dirt collecting pipe (12); the dirt absorbing channel (11) can form a centrifugal angle α; the rotating dirt collecting tube (12) can be connected with a rotating power source. 2. A backwash net filter, comprising a water outlet (1), a water inlet (2), a filter screen (4), a valve (7), a sewage outlet (8), and a housing (14), characterized in that, An axially movable rotating dirt collecting pipe (12) leading to the sewage outlet (8) is arranged in the filter screen (4), and a dirt adsorption channel (11) is arranged on the rotating dirt collecting pipe (12). ), the dirt adsorption channel (11) communicates with the rotary dirt collection pipe (12); the dirt adsorption channel (11) can be at a centrifugal angle α; the rotary dirt collection tube (12) can be connected with the rotary power source. 3. The backwashing screen filter according to claim 2, characterized in that a two-way spiral fit is provided between the rotating dirt collecting pipe (12) and its bearing (13). 4. The backwashing screen filter according to claim 1 or 2, characterized in that the centrifugal sewage discharge pipe (9) can be connected to the end of the rotating dirt collection pipe (12), and the centrifugal sewage discharge pipe (9) ) is provided with an outlet at opposite ends. 5. The backwashing screen filter according to claim 1 or 2, characterized in that the filter can also include a differential pressure sensor and a controller (6), and the valve (7) is a solenoid valve at this time. 6. The backwashing screen filter according to claim 1 or 2, characterized in that the rotating power source is a motor (15). 7. The backwashing screen filter according to claim 1 or 2, characterized in that a coarse filter screen (3) is provided between the water inlet (2) and the filter screen (4). 8. The backwashing screen filter according to claim 1 or 2, characterized in that the dirt adsorption channel (11) is a sheet or tube structure, and there can be one or more.

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