CN106267964A - The preposition water filter of back flush type - Google Patents

Abstract

A backwash type pre-water filter belongs to the field of living appliances, and includes a cover with a water inlet and an outlet and a cylinder connected to the cover. A filter cavity is defined in the cylinder, and the filter screen is arranged in the cylinder The filter cavity is divided into an inner filter cavity and an outer filter cavity, the water inlet is connected to the inner filter cavity, and the water outlet is connected to the outer filter cavity; the bottom of the cylinder is provided with a drain port, and a drain valve is arranged on it. The drain port is connected with the inner filter chamber; the cover is provided with a piston plug capable of moving up and down and a partition block that blocks the connection between the water inlet and the water outlet, and the partition block is provided with a communication channel between the water outlet end and the water inlet end. aisle. Through the up and down displacement of the piston plug, the flow channel and the inner filter cavity are respectively blocked to control the flow direction of the water inlet, which can realize two cleaning methods, positive flushing and backwashing, and improve the cleaning efficiency of the filter screen.

Description

Backwash pre-water filter

technical field

The invention belongs to the field of living appliances, and in particular relates to a backwash type pre-water filter for domestic drinking water.

Background technique

The filter screens of the pre-filters all use sintered screens. Since the screens are used for a long time, in the process of filtering impurities in the pipeline, washing the impurities on the screens is a very important technical barrier. At present, there are two types of flushing methods used by most manufacturers: the first is positive flushing (Figure 1 and Figure 2), which is the same as the direction and process of product filtration; the second is reverse flushing (Figure 3 and Figure 2). Figure 4), rinse from the inside and outside of the filter together.

The above two methods are used to flush impurities along the direction of the original filter waterway. The disadvantages of this flushing method are as follows:

1. The washing direction is the same as the filtering direction, and the washing efficiency is not high and not thorough. Reason: Since the filtering method of the waterway protector is to separate the particulate impurities in the tap water through the interception of the filter screen, most of the particulate impurities are attached to the filter screen. When the washing direction is the same as the filtering direction, these particles on the filter screen Particle impurities are protected by the gap of the filter screen and cannot be flushed from the front, so the flushing is not clean;

2. The filter is not rinsed thoroughly enough. Reason: When the product is in use, there will be a lot of impurities around the round filter. When flushing, because the water inlet is only on one side of the filter, the entire filter cannot be completely cleaned.

Contents of the invention

In view of the deficiencies in the prior art, the purpose of the present invention is to propose a backwash type pre-water filter, which uses its own structure to change the direction of the incoming water flow to realize the self-cleaning treatment of the filter screen, and is used to solve the problem of backwash waterway and filter waterway. When it is consistent, the filter screen flushing efficiency is low and the filter screen flushing is not thorough during the backwashing process.

To achieve the above object, the present invention adopts the following technical solutions:

The backwash type pre-water filter includes a cover with a water inlet and an outlet and a cylinder detachably connected to the cover. A filter cavity is defined in the cylinder, and the filter screen is arranged in the cylinder and the The filter cavity is divided into an inner filter cavity and an outer filter cavity, the water inlet communicates with the inner filter cavity, and the water outlet communicates with the outer filter cavity; the bottom of the cylinder is provided with a drain port, A drain valve is arranged on it; the drain port communicates with the inner filter cavity; it is characterized in that: the cover is provided with a water flow conversion device capable of switching the water flow between normal filtering operation and recoil operation; the water flow conversion The device includes: a partition block that blocks the connection between the water inlet and the water outlet, a piston plug that can block the inner filter cavity, and a top knob that drives the piston plug to move up and down. The partition block is provided with a flow channel. One end of the circulation channel is in communication with the water outlet, and the other end of the circulation channel is located at the upward position of the piston plug, so that the circulation channel is blocked when the piston plug is at the upward position, and the inner plug is blocked when the piston plug is at the downward position. filter cavity.

Further, the top knob is located at the upper end of the cover body, and is connected to the piston plug through a screw rod; an internal thread cap matching the screw rod is arranged in the cover body, and one end of the screw rod is connected to the internal thread cap, so that The other end of the screw rod is fixedly connected with the piston plug.

Further, the bottom of the filter cavity is provided with a filter screen mounting seat, the filter screen is arranged on the filter screen mounting seat, and a sewage discharge channel is arranged in the filter screen mounting seat, and the sewage discharge channel is respectively connected to the inner The filter cavity communicates with the drain port.

Further, the cover and the barrel are screwed together.

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

The backwash type pre-water filter provided by the present invention blocks the flow channel and the inner filter cavity respectively through the up and down displacement of the piston plug to control the flow direction of the water inlet, so that the filter screen can be cleaned more easily and powerfully. Bigger and more logically oriented. Through the adjustment of the above-mentioned water flow, two cleaning methods, forward flushing and backwashing, can be realized. While increasing the flushing sales volume, the flushing time is shortened, thereby saving flushing water.

Description of drawings

Fig. 1 is a schematic diagram of the filtration state of positive flushing in the prior art.

Fig. 2 is a schematic diagram of the blowdown state of being flushed in the prior art.

Fig. 3 is a schematic diagram of the filtration state of reverse flushing in the prior art.

Fig. 4 is a schematic diagram of the blowdown state of reverse flushing in the prior art.

Fig. 5 is a schematic diagram of the filtering state provided by the present invention.

Fig. 6 is a schematic diagram of the blowdown state provided by the present invention.

detailed description

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Example:

As shown in Figure 5 and Figure 6: the backwash pre-water filter includes a cover 1 with a water inlet 1-1 and a water outlet 1-2 and a cylinder 2 detachably connected to the cover 1 (in this paper In the embodiment, the cover and the cylinder are threaded, and other connection methods can also be used, such as buckle connection), the cylinder 2 defines a filter cavity, and the filter screen 3 is arranged in the cylinder 2 and the The filter cavity is divided into an inner filter cavity 4 and an outer filter cavity 5, the water inlet 1-1 communicates with the inner filter cavity 4, and the water outlet 1-2 communicates with the outer filter cavity 5; The bottom of the cylinder body 2 is provided with a drain port 7 on which a drain valve 8 is arranged; the drain port 7 communicates with the inner filter cavity 4 . In order to improve the stability of the filter screen 3 placement, the bottom of the filter cavity is provided with a filter screen mounting seat 6, and the filter screen 3 is arranged on the filter screen mounting seat 6 and is located in the filter screen mounting seat 6 A sewage discharge channel is provided, and the sewage discharge channel communicates with the inner filter cavity 4 and the water outlet 7 respectively. The filter screen installation seat 6 is solid except for the sewage passage, and the water flow cannot pass through.

In order to achieve cleaner cleaning of the filter screen, the cover body 1 is provided with a water flow conversion device capable of switching the water flow between normal filtering operation and backwashing operation. Specifically:

The water flow conversion device includes: a partition block that blocks the communication between the water inlet and the water outlet, a piston plug 11 that can block the inner filter cavity 4, a top knob 10 that drives the piston plug 11 to move up and down, and the partition block There is a circulation passage 9 on the top, one end of the circulation passage 9 communicates with the water outlet 1-2, and the other end of the circulation passage 9 is located at the upward position of the piston plug 11, so that when the piston plug 11 is located at the upward movement position The circulation channel 9 is blocked, and the inner filter cavity 4 is blocked when the piston plug 11 is in a downward position.

Further, the top knob 10 is located at the upper end of the cover body 1, and is connected with the piston plug 11 through a screw rod; the cover body 1 is provided with an internal threaded cap matching the screw rod, and one end of the screw rod It is connected with the internal thread cap, and the other end of the screw rod is fixedly connected with the piston plug.

As shown in Figure 5, when it is in the filtering state (filtering water), the plug of the piston is moved up, blocking the entrance of the circulation channel and opening the entrance of the inner filter cavity. Untreated raw water enters the inside of the filter from the water inlet (that is, the inner filter cavity), and the water flows out from the inside of the filter to the outside. During this process, the filter filters the raw water and leaves the filtered impurities in the filter. inside the net. The treated water flows out through the water outlet.

As shown in Figure 6, when it is in the state of sewage discharge (to clean up the impurities on the filter), the piston plug is located at the downward position, blocking the entrance of the inner filter cavity and opening the entrance of the flow channel. The water flow for cleaning enters from the water inlet and enters the outside of the filter screen along the flow channel (that is, the outer filter cavity). . At the same time, the drain valve is opened, and the water flows out through the drain valve and takes away impurities, thereby realizing the cleaning of the filter screen.

When performing reverse cleaning on the filter screen, the positive flushing method shown in Figure 2 can also be realized, as follows: the piston plug is located at the upward position, blocking the entrance of the flow channel, and opening the entrance of the inner filter cavity; at the same time, open the drain valve. The water used for cleaning directly enters the inside of the filter screen (that is, the inner filter cavity) from the water inlet, and the impurities attached to the inner wall of the filter screen are discharged through the drain valve.

The above are only descriptions of the preferred embodiments of the present invention, but should not be construed as limiting the claims. The present invention is not limited to the above embodiments, and all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (4)

1. Backwash type pre-water filter, including a cover with a water inlet and an outlet and a cylinder detachably connected to the cover, the cylinder defines a filter cavity, the filter is arranged in the cylinder and The filter cavity is divided into an inner filter cavity and an outer filter cavity, the water inlet communicates with the inner filter cavity, and the water outlet communicates with the outer filter cavity; the bottom of the cylinder is provided with a drain A drain valve is provided on it; the drain port communicates with the inner filter chamber; it is characterized in that: the cover is provided with a water flow switching device capable of switching the water flow between normal filtering operation and recoil operation; The water flow conversion device includes: a partition block that blocks the communication between the water inlet and the water outlet, a piston plug that can block the inner filter cavity, and a top knob that drives the piston plug to move up and down. One end of the circulation channel communicates with the water outlet, and the other end of the circulation channel is located at the upward position of the piston plug, so that the circulation channel is blocked when the piston plug is at the upward position, and the piston plug is at the downward position When blocking the inner filter chamber. 2. The backwash type pre-water filter according to claim 1, characterized in that: the top knob is located at the upper end of the cover, and is connected to the piston plug through a screw rod; A matching internal thread cap, one end of the screw rod is connected to the internal thread cap, and the other end of the screw rod is fixedly connected to the piston plug. 3. The backwash type pre-water filter according to claim 1, characterized in that: the bottom of the filter cavity is provided with a filter screen mounting seat, and the filter screen is arranged on the filter screen mounting seat, A sewage discharge channel is arranged in the filter screen installation seat, and the sewage discharge channel communicates with the inner filter cavity and the drain port respectively. 4. The backwash type pre-water filter according to claim 1, characterized in that: the cover body and the cylinder body are threaded.