Bag filter capable of realizing automatic backwashing

Abstract

The utility model relates to the technical field of water purification treatment, in particular to a bag type filter capable of realizing automatic backwashing, which is characterized in that an annular overflow piece comprises a bottom ring of which the outer edge is fixed at the top of the inner peripheral wall of a tank body, a cylindrical piece fixed at the inner edge of the top surface of the bottom ring and a top ring of which the outer edge of the bottom surface is fixed at the top end of the cylindrical piece; the outer edge of the top end of the filter bag is detachably fixed to the top ring, the filter bag is of a rigid structure, a clean water outlet is formed in the position, corresponding to the upper side of the bottom ring, of the side wall of the tank body and connected with a clean water pipe, a water outlet valve is arranged on the clean water pipe, a raw water inlet is formed in the side wall of the tank body and connected with a raw water pipe, and a water inlet valve is arranged on the raw water pipe. The bottom end of the tank body is connected with a blow-off pipe which is provided with a blow-off valve; a back-flushing water pipe is connected between the position of the raw water pipe outside the water inlet valve and the position of the clear water pipe inside the water outlet valve, and a back-flushing water valve is arranged on the back-flushing water pipe; the problem that a filter bag of a conventional bag filter needs to be cleaned and replaced frequently is well solved.

Description

Technical Field

[0001] The utility model relates to the technical field of water purification treatment, in particular to a bag filter capable of realizing automatic backwashing. Background Art

[0002] Bag filter is a highly efficient filtering device that can effectively remove suspended matter, sediment, organic matter and other impurities in water. It is mainly used as a pretreatment device in the water treatment industry. Because most filter bags are made of PP material, they are low-cost, have certain adsorption and retention characteristics, and can also remove some harmful substances such as microorganisms and bacteria in water, so they are widely used.

[0003] There are various types of bag filters according to the filter flow and pressure. They are all composed of basic filter units. The principle is that the filter bag is placed in a mesh basket and uses internal pressure filtration.

[0004] However, in actual applications, the disadvantage of this filtering method is that the filter bags need to be cleaned manually, especially when the raw water quality is poor, frequent operations are required, and the disadvantage is particularly obvious. In addition, the cleaning or replacement time is long, which affects the water supply.

[0005] Therefore, we propose a bag filter that can achieve automatic backwashing. Utility Model Content

[0006] The utility model aims to provide a bag filter capable of realizing automatic backwashing, so as to solve the problem that the filter bags of the bag filters in the prior art are not convenient for efficient cleaning.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bag filter capable of realizing automatic backwashing, comprising a tank body, a top cover detachably mounted on the top of the tank body, the annular overflow member comprising a bottom ring whose outer edge is fixed to the top of the inner peripheral wall of the tank body, a cylindrical member fixed to the inner edge of the top surface of the bottom ring, and a top ring whose bottom surface outer edge is fixed to the top of the cylindrical member, the outer edge of the top of the filter bag is detachably fixed to the top ring, and the filter bag is a rigid structure, a clean water outlet is arranged on the side wall of the tank body corresponding to the upper side of the bottom ring, the clean water outlet is connected to a clean water pipe, and a water outlet valve is arranged on the clean water pipe, a raw water inlet is arranged on the side wall of the tank body, the raw water inlet is connected to a raw water pipe, and a water inlet valve is arranged on the raw water pipe, a sewage pipe is connected to the bottom end of the tank body, and a sewage pipe is arranged on the sewage pipe; a backwashing water pipe is connected between the position of the raw water pipe located outside the water inlet valve and the position of the clean water pipe located inside the water outlet valve, and a backwashing water pipe is arranged on the backwashing water valve.

[0008] Preferably, the outside and the inside of the filter bag are respectively provided with an outer mesh basket and an inner mesh basket, and the top outer edges of the filter bag, the outer mesh basket and the inner mesh basket are respectively detachably fixed on the top ring.

[0009] Preferably, it also includes an elastic clamping assembly, which includes a pair of side frames whose bottom ends are respectively fixed to the outer edges of the top surface of the top ring, a pressing ring that presses the top outer edges of the filter bag, the outer basket and the inner basket onto the top ring, a slat that slides and is clamped to the top of the side frame in a horizontal direction, and a spring connected between the bottom surface of the slat and the top surface of the pressure ring.

[0010] Preferably, the sewage valve, water outlet valve, water inlet valve and backwash valve are all electric valves.

[0011] Preferably, the mesh sizes of the outer basket and the inner basket are consistent.

[0012] Preferably, the water outlet valve and the sewage drain valve are quick-opening valves.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model relates to a bag filter capable of realizing automatic backwashing, which can perform internal pressure backwashing, has a good backwashing effect, can be completed efficiently in a short time, and has little impact on water supply; it avoids frequent manual cleaning of the filter bag, thus saving labor.

[0015] 2. The utility model relates to a bag filter capable of realizing automatic backwashing, which requires little investment and has obvious effects; it is also suitable for the transformation of bag filters that have been installed and operated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the utility model as a whole;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the annular overflow member of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the elastic pressing component of the utility model.

[0019] In the figure: 1-tank body; 1.1-top cover; 1.2-clean water outlet; 1.3-raw water inlet; 1.4-drain pipe; 1.5-drain valve;

[0020] 2-Outer basket;

[0021] 3-Filter bag;

[0022] 4-Inner basket;

[0023] 5- annular overflow part; 5.1- bottom ring; 5.2- cylindrical part; 5.3- top ring;

[0024] 6-elastic clamping assembly; 6.1-pressing ring; 6.2-side frame; 6.3-slat; 6.4-spring;

[0025] 7-clean water pipe; 7.1-water outlet valve;

[0026] 8-Raw water pipe; 8.1-Water inlet valve;

[0027] 9-Backflush water pipe; 9.1-Backflush water valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-3 The utility model provides a technical solution, a bag filter capable of realizing automatic backwashing, wherein a top cover 1.1 is detachably mounted on the top of the tank body 1, that is, the filter bag 3 can be easily installed and removed by opening the top cover 1.1.

[0030] The annular overflow member 5 comprises a bottom ring 5.1 whose outer edge is fixed to the top of the inner peripheral wall of the tank body 1, a cylindrical member 5.2 fixed to the inner edge of the top surface of the bottom ring 5.1, and a top ring 5.3 whose bottom surface outer edge is fixed to the top of the cylindrical member 5.2, that is, an overflow cavity is formed between the cylindrical member 5.2, the bottom ring 5.1 and the side wall of the tank body 1.

[0031] The top outer edge of the filter bag 3 is detachably fixed on the top ring 5.3, and the filter bag 3 is a rigid structure. The filter bag 3 can be made of a stainless steel filter mesh; it can also be made of a composite form, that is, the outside and inside of the filter bag 3 are respectively provided with an outer basket 2 and an inner basket 4, and the top outer edges of the filter bag 3, the outer basket 2 and the inner basket 4 are detachably fixed on the top ring 5.3, respectively, and the mesh sizes of the outer basket 2 and the inner basket 4 are consistent, and the outer basket 2 and the inner basket 4 match the outer dimensions of the filter bag 3 to ensure support and compression of the filter bag 3.

[0032] A clean water outlet 1.2 is provided at a position on the side wall of the tank body 1 corresponding to the upper side of the bottom ring 5.1, and the clean water outlet 1.2 is connected to a clean water pipe 7, and a water outlet valve 7.1 is provided on the clean water pipe 7. A raw water inlet 1.3 is provided on the side wall of the tank body 1, and the raw water inlet 1.3 is connected to a raw water pipe 8, and a water inlet valve 8.1 is provided on the raw water pipe 8. A sewage pipe 1.4 is connected to the bottom end of the tank body 1, and a sewage valve 1.5 is provided on the sewage pipe 1.4; a backwash water pipe 9 is connected between the position of the raw water pipe 8 located outside the water inlet valve 8.1 and the position of the clean water pipe 7 located inside the water outlet valve 7.1, and a backwash water pipe 9 is provided with a backwash water valve 9.1

[0033] In summary, when filtering raw water normally, close the drain valve 1.5 and the backwash valve 9.1, and open the water inlet valve 8.1 and the water outlet valve 7.1. Raw water enters the inner cavity of the tank body 1 through the raw water pipe 8 and the raw water inlet 1.3. The raw water is filtered by the filter bag 3, and the impurity particles therein are blocked outside the filter bag 3. A clean water cavity is formed inside the filter bag 3. After the clean water level in the clean water cavity continues to rise, it overflows from the top of the filter bag 3 to the annular cavity between the cylindrical member 5.2 and the inner wall of the tank body 1, and then is discharged from the clean water outlet 1.2 through the clean water pipe 7 to complete the external pressure filtration operation.

[0034] After the filter has been used for a long time, a large number of foreign particles are attached to the outer wall of the filter bag 3, which affects the filtering performance of the filter bag 3 and requires backwashing: close the outlet valve 7.1 and the inlet valve 8.1, open the backwash valve 9.1 and the drain valve 1.5, and then the raw water in the outer end of the raw water pipe 8 enters the overflow cavity from the clean water outlet 1.2 through the backwash pipe 9 and the end of the clean water pipe 7, and then the raw water enters the filter bag 3. At this time, the raw water flows to the outside after being filtered by the filter bag 3, so that the foreign particles attached to the outer wall of the filter bag 3 are backwashed and removed, and the foreign particles that fall off the outer wall of the filter bag 3 are discharged from the drain pipe 1.4 with the water flow to complete the internal pressure backwashing operation of the filter bag 3.

[0035] In order to facilitate the firm installation of the composite filter structure composed of the filter bag 3, the outer net basket 2 and the inner net basket 4, an elastic pressing assembly 6 is also provided, which includes a pair of side frames 6.2 whose bottom ends are respectively fixed to the outer edges of the top surface of the top ring 5.3, a pressing ring 6.1 that presses the top outer edges of the filter bag 3, the outer net basket 2 and the inner net basket 4 on the top ring 5.3, a slat 6.3 that slides and clamps on the top of the side frame 6.2 in the horizontal direction, and a spring 6.4 connected between the bottom surface of the slat 6.3 and the top surface of the pressing ring 6.1. That is, the slat 6.3 is fixed to the top of the side frame 6.2, and the spring 6.4 presses the pressing ring 6.1, so that the pressing ring 6.1 presses the top outer edges of the filter bag 3, the outer net basket 2 and the inner net basket 4 on the top ring 5.3.

[0036] In order to improve the automation level of the filter operation, the drain valve 1.5, the outlet valve 7.1, the inlet valve 8.1 and the backwash valve 9.1 are all electric valves. In addition, an electronic control unit is matched, that is, the flow signal or the pressure difference signal before and after the filter is used to control the start and stop and duration of backwashing.

[0037] The water outlet valve 7.1 and the sewage valve 1.5 are quick-open valves, and the water inlet valve 8.1 and the backwash valve 9.1 are common electric valves, so that the switching between the filtering and backwashing processes can be better connected to improve the filtering effect.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bag filter capable of realizing automatic backwashing, comprising a tank body (1), wherein a top cover (1.1) is detachably mounted on the top of the tank body (1), characterized in that: Also includes: An annular overflow member (5), the annular overflow member (5) comprising a bottom ring (5.1) whose outer edge is fixed to the top of the inner peripheral wall of the tank body (1), a cylindrical member (5.2) fixed to the inner edge of the top surface of the bottom ring (5.1), and a top ring (5.3) whose bottom surface outer edge is fixed to the top of the cylindrical member (5.2); A filter bag (3), wherein the outer edge of the top end of the filter bag (3) is detachably fixed to the top ring (5.3), and the filter bag (3) is a rigid structure; A clean water outlet (1.2) is provided on the side wall of the tank body (1) at a position corresponding to the upper side of the bottom ring (5.1); the clean water outlet (1.2) is connected to a clean water pipe (7); the clean water pipe (7) is provided with a water outlet valve (7.1); a raw water inlet (1.3) is provided on the side wall of the tank body (1); the raw water inlet (1.3) is connected to a raw water pipe (8); the raw water pipe (8) is provided with a water inlet valve (8.1); a sewage pipe (1.4) is connected to the bottom end of the tank body (1); the sewage pipe (1.4) is provided with a sewage valve (1.5); A backwash water pipe (9) is connected between a position of the raw water pipe (8) located outside the water inlet valve (8.1) and a position of the clean water pipe (7) located inside the water outlet valve (7.1), and a backwash water valve (9.1) is provided on the backwash water pipe (9).

2. A bag filter capable of realizing automatic backwashing according to claim 1, characterized in that: The outside and inside of the filter bag (3) are respectively provided with an outer mesh basket (2) and an inner mesh basket (4), and the top outer edges of the filter bag (3), the outer mesh basket (2) and the inner mesh basket (4) are respectively detachably fixed to the top ring (5.3).

3. A bag filter capable of automatic backwashing according to claim 2, characterized in that: It also includes an elastic clamping assembly (6), which includes a pair of side frames (6.2) whose bottom ends are respectively fixed to the outer edges of the top surface of the top ring (5.3), a pressing ring (6.1) for pressing the top outer edges of the filter bag (3), the outer net basket (2) and the inner net basket (4) onto the top ring (5.3), a slat (6.3) that is slidably engaged with the top of the side frame (6.2) in a horizontal direction, and a spring (6.4) connected between the bottom surface of the slat (6.3) and the top surface of the pressing ring (6.1).

4. A bag filter capable of realizing automatic backwashing according to claim 1, characterized in that: The sewage valve (1.5), the water outlet valve (7.1), the water inlet valve (8.1) and the backwash valve (9.1) are all electric valves.

5. A bag filter capable of automatic backwashing according to claim 2, characterized in that: The mesh sizes of the outer mesh basket (2) and the inner mesh basket (4) are consistent.

6. A bag filter capable of realizing automatic backwashing according to claim 4, characterized in that: The water outlet valve (7.1) and the sewage discharge valve (1.5) are quick-opening valves.

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