A device for ultrasonic backwashing filter element

Abstract

The present invention relates to a device for ultrasonic backwashing filter element. The present invention comprises a closed backwashing device and a circulating flushing circuit connected to the input and output ports of the backwashing device, an ultrasonic vibrating rod and a structure for positioning the filter element are arranged in the backwashing device, the filter element to be cleaned is positioned on the ultrasonic vibrating rod and the two ports of the filter element are closed, a flushing liquid is supplied into the filter element cylinder through an external circulating circuit, and is discharged from the outside of the filter element cylinder through the filter layer of the filter element cylinder, and the filter element is flushed under the ultrasonic promotion effect generated by the ultrasonic vibrating rod, the circulating flushing circuit is provided with a filter and a graded filtering liquid storage box, the flushing liquid after flushing can be filtered, and the flushing liquid can also be independently circulated and filtered, the circulating flushing circuit is also provided with an air source branch circuit, which can be connected to compressed gas for drainage, so as to facilitate the rapid removal and placement of the filter element, and realize the efficient cleaning of the waste filter element, with low cost and good effect.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic filter element cleaning and treatment, in particular to a device for ultrasonic backwashing a filter element. Background Art

[0002] The mesh filter element is composed of a metal mesh wound on a support frame. It relies on the tiny grids of the metal mesh to block the passage of impurities in the oil. The mesh filter element can generally filter out impurity particles with a diameter of >0.08~0.18mm, and has a low pressure loss. The filter of the mesh filter element is usually used as a coarse filter at the oil suction port of the pump to ensure large capacity and easy cleaning. The sintered filter element is sintered from metal powder, and uses the micropores between the metal particles to block the passage of impurities in the oil. By changing the size of the metal particle powder, filter elements with different filtration accuracies can be produced. Sintered filter elements can filter out impurity particles with a diameter of >0.01-0.1mm, with low pressure loss. They are used in pressure oil circuits or loops. They are simple to manufacture, have high filtering accuracy, and can withstand high pressure. Therefore, mesh filter elements and sintered filter elements are widely used in the hydraulic field. However, filter elements are consumables and are generally scrapped after use. Currently, the reuse of industrial products is advocated to achieve the goal of green energy conservation. Cleaning mesh filter elements and sintered filter elements to fully restore or restore them to a state close to the initial filtering state so that they can be used twice or multiple times is beneficial to environmental protection and saves capital expenditures. However, existing cleaning technology and equipment cannot effectively restore the filtering function of the filter element. Summary of the invention

[0003] In order to solve the problem of filter element cleaning, the present invention invents a device for ultrasonic backwashing filter element.

[0004] The present invention adopts the following technical solutions:

[0005] A device for ultrasonic backwashing filter element, comprising a backwashing device and a circulation system, wherein the backwashing device comprises a horizontally placed outer cylinder with a flushing liquid output port and an input port, the outer cylinder body is provided with a left end cover and a right end cover capable of being switched, the left end cover and the right end cover seal the outer cylinder to form a closed inner cavity, a middle partition is further provided in the outer cylinder, the middle partition divides the inner cavity of the outer cylinder into a left cavity and a right cavity, the input port is connected to the left cavity, the output port is connected to the right cavity, through holes are distributed on the middle partition, an interface sleeve is adapted to be installed with the through holes and is located in the right cavity, the interface sleeve is provided with an axial through hole, a left ring platform and a right ring platform, the left ring platform is gap-matched with the through hole, the right ring platform is adapted to the inner hole of the filter element end, an ultrasonic vibrating rod extending into the outer cylinder body is fixedly provided with the left end cover, an ultrasonic tool head of the ultrasonic vibrating rod passes through the interface sleeve and extends to the right cavity, the interface sleeve and the right end cover clamp and position the filter element and fix it in the right cavity of the outer cylinder, an annular gap for fluid to pass is reserved between the axial through hole of the interface sleeve and the ultrasonic vibrating rod passing therethrough, so that the inner cylinder of the filter element is connected to the left cavity;

[0006] The circulation loop includes: a loop consisting of a strong magnetic filter, a bag filter, a first absorbent cotton wire-wound filter, a flushing tank, a circulation power source, and a second absorbent cotton wire-wound filter connected in sequence, wherein the outlet of the second absorbent cotton wire-wound filter is connected to the input port of a backwashing device, and the output port of the backwashing device is connected to the inlet of the strong magnetic filter.

[0007] The flushing box includes a first flushing box, a second flushing box, and a third flushing box. The outlets and inlets of the three flushing boxes are respectively provided with independently controlled electric valves. The input ports before the inlet electric valves of the three flushing boxes are interconnected and merged, and the output ports after the outlet electric valves of the three flushing boxes are interconnected and merged. The outlet of the first absorbent cotton wire-wound filter is connected to the merged input ports of the three flushing boxes, and the merged output ports of the three flushing boxes are connected to the inlet of the circulating power source. The flushing liquid output ports of the backwashing device include: a first lower outlet arranged at the lower part of the outer cylinder and connected to the left cavity, a second lower outlet and a third lower outlet arranged at the lower part of the outer cylinder and connected to the right cavity, and an upper outlet arranged at the upper part of the outer cylinder and connected to the right cavity. The first lower outlet is connected to the first flushing box through an electric valve, the second lower outlet and the third lower outlet are connected to the inlet of the strong magnetic filter through the electric valve after merging, and the upper outlet is connected to the inlet of the strong magnetic filter through the electric valve.

[0008] The circulation loop is provided with a logic element and a gas-liquid switching circuit for emptying the flushing liquid. Specifically, a second one-way valve is provided at the outlet of the circulation power source, and an air source input branch is provided between the second one-way valve and the second absorbent cotton wire-wound filter. The air source input branch comprises an electric valve and a first one-way valve which are sequentially arranged in the branch after being connected to the air source input port.

[0009] The circulation power source is a diaphragm pump. Pressure gauges are respectively arranged before and after the loop of the bag filter, and pressure gauges are respectively arranged before and after the loop of the second absorbent cotton wire-wound filter.

[0010] A breather is arranged on the flushing box body, a liquid level gauge is arranged on the side of the box body, and a heater is arranged inside the box body.

[0011] The opening and closing is achieved by setting a flange at the right port of the outer cylinder and connecting it with bolts on the right end cover.

[0012] The backwash device has three filter element installation positions, and the middle partition plate body has three through holes for adapting to the installation of the interface sleeve. Correspondingly, the position and number of ultrasonic vibration rods arranged on the left end cover are adapted to the position and number of the through holes of the corresponding middle partition plate.

[0013] The interface sleeve is detachable and replaceable, the outer diameter of the right ring table can be adaptively changed according to the inner hole diameter of the filter element and its connecting end, and the length of the interface sleeve can be adaptively changed according to the length of the filter element.

[0014] The effective extension length of the ultrasonic tool head covers the length of the right cavity.

[0015] Compared with the prior art, the present invention can achieve the following technical effects: a plurality of waste filter elements of different specifications can be simultaneously loaded into the backwashing device for backwashing treatment under independent ultrasonic action; during the flushing process, the cleaning liquid is filtered through multiple filters to realize the recovery of impurities; after three-stage circulation treatment, the waste filter element can be cleaned more thoroughly and the recycling rate can be higher; at the same time, it has the function of independent circulation filtration of the flushing liquid, and an air source logic branch loop is set to empty the flushing liquid in the backwashing device without manual drainage, thereby realizing the filter element removal and placement with low manpower output.

[0016] The invention realizes efficient cleaning of waste filter elements such as mesh filter elements and sintered filter elements, with low cost and good effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the principle diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the backwashing device of the present invention;

[0019] Figure 3 It is a cross-sectional view of the interface sleeve of the present invention.

[0020] Among them, 1-backwashing device, 2-strong magnetic filter, 3-bag filter, 4-first absorbent cotton wire-wound filter, 5-pressure gauge, 6-first flushing box, 7-second flushing box, 8-third flushing box, 9-respirator, 10-liquid level meter, 11-heater, 12-diaphragm pump, 13-air source input port, 14-first one-way valve, 15-second one-way valve, 16-second absorbent cotton wire-wound filter, 17-filter element, 101-left end cover, 102-outer cylinder, 103-middle partition, 104-flange, 105-right end cover, 106-interface sleeve, 107-ultrasonic vibration rod, 108-upper inlet, 109-first lower outlet, 110-second lower outlet, 111-third lower outlet, 112-upper outlet, 106-1-left ring platform, 106-2-right ring platform. DETAILED DESCRIPTION

[0021] like Figure 1 , a device for ultrasonic backwashing a filter element, comprising: a backwashing device 1, a strong magnetic filter 2, a bag filter 3, a first absorbent cotton wire-wound filter 4, a pressure gauge 5, a flushing box, a diaphragm pump 12, a second one-way valve 15, a second absorbent cotton wire-wound filter 16, an air source input port 13, a first one-way valve 14, an electric ball valve, and a system circulation loop composed of the above;

[0022] The flushing box includes a first flushing box 6, a second flushing box 7, and a third flushing box 8. The three flushing boxes have the same structural composition. Taking the first flushing box 6 as an example, a respirator 9 is arranged on the box body, a liquid level meter 10 is arranged on the side of the box body, and a heater 11 is arranged in the box body; the outlets and inlets of the three flushing boxes are respectively provided with independently controlled electric valves, the input ports before the inlet electric valves of the three flushing boxes are connected and merged, and the output ports after the outlet electric valves of the three flushing boxes are connected and merged;

[0023] The backwashing device 1 is provided with a flushing liquid outlet and an inlet. A primary filtering circuit is connected between the flushing liquid outlet of the backwashing device 1 and the inlets of the three flushing boxes. A strong magnetic filter 2, a bag filter 3, and a first absorbent cotton wire-wound filter 4 are sequentially connected in series in the circuit. Pressure gauges 5 are respectively provided at the front and rear ends of the bag filter 3.

[0024] The loop between the combined output ports of the three flushing boxes and the input port of the flushing box backwashing device 1 is connected in series to set a circulating liquid power source and a filter at the input end of the backwashing device 1. The circulating power source is a diaphragm pump 12, which has good conveyor belt particles and high-viscosity liquids. The filter at the input end of the backwashing device 1 is a second absorbent cotton wire-wound filter 16. Pressure gauges are respectively connected in series before and after the loop of the second absorbent cotton wire-wound filter 16, which can be used for independent circulation filtering of flushing liquid;

[0025] The circulation loop is provided with a logic element and a gas-liquid switching circuit for emptying the flushing liquid of the backwashing device 1. Specifically, a second one-way valve 15 is provided at the outlet of the diaphragm pump 12, and an air source input branch is provided between the second one-way valve 15 and the second absorbent cotton wire-wound filter 16. The air source input branch is: an electric valve and a first one-way valve 14 are sequentially arranged in the branch after being connected to the air source input port 13. The first one-way valve 14 prevents the flushing liquid from retrogradely entering the air source branch.

[0026] like Figure 1-2 The backwashing device 1 includes an outer cylinder 102 provided with a flushing liquid output port and an input port. The outer cylinder 102 body is provided with a left end cover 101 and a right end cover 105. The left end cover 101 is fixedly provided with an ultrasonic vibration rod 107 extending into the outer cylinder 102 body. The right end cover 105 is a detachable cover, which is opened and closed by bolting the flange 104 provided at the right port of the outer cylinder 102 with the right end cover 105. A filter element can be placed in the outer cylinder 102 body. The left end cover 101 and the right end cover 105 close the outer cylinder 102 to form a closed inner cavity.

[0027] like Figure 1-3The outer cylinder 102 is placed horizontally, and a middle partition 103 is also arranged inside the outer cylinder 102. The middle partition 103 divides the inner cavity of the outer cylinder into a left cavity and a right cavity. The middle partition 103 is provided with through holes, and an interface sleeve 106 is installed to match the through holes and is located in the right cavity. The interface sleeve 106 is provided with an axial through hole, a left ring platform 106-1 and a right ring platform 106-2. The left ring platform 106-1 is matched with the through hole clearance, and the right ring platform 106-2 is matched with the inner hole of the filter element end. Through the interface sleeve 10 6 and the right end cover 105 are clamped and positioned to fix the filter element in the outer cylinder. The filter element specifications are different, and the inner holes and lengths of the filter element are different. The outer diameter M1 of the right ring stage 106-2 and the length M2 of the interface sleeve can be adaptively changed according to the size of the filter element. The interface sleeve 106 can be replaced and adjusted. The interface sleeve 106 is axially provided with a hole for the ultrasonic vibrating rod 107 to pass through. The flushing liquid input port set in the backwashing device 1 is: set at the upper part of the outer cylinder 102 and connected to the upper inlet 108 of the left cavity The output port includes: a first lower outlet 109 arranged at the lower part of the outer cylinder 102 and connected to the left cavity, a second lower outlet 110 and a third lower outlet 111 arranged at the lower part of the outer cylinder 102 and connected to the right cavity, and an upper outlet 112 arranged at the upper part of the outer cylinder 102 and connected to the right cavity. The first lower outlet 109 is connected to the first flushing box 6 through an electric valve, and the second lower outlet 110 and the third lower outlet 111 are connected to the inlet of the strong magnetic filter 2 through the electric valve after merging, and the upper outlet 112 is connected to the inlet of the strong magnetic filter 2 through the electric valve. The ultrasonic vibration rod 107 extending into the outer cylinder 102 passes through the axial through hole of the interface sleeve 106 and extends to the right cavity. The length of the effective extension section of the ultrasonic tool head covers the length of the right cavity. The ultrasonic tool head is used to generate ultrasonic vibration and emit this vibration energy into the liquid. An annular gap for fluid to pass is reserved between the axial through hole of the interface sleeve 106 and the ultrasonic vibration rod 107 passing therethrough.

[0028] The cleaning efficiency and cleaning quality of the filter element 17 are comprehensively considered, such as Figure 2 The backwashing device 1 preferably has three filter element installation positions, and the middle partition plate 103 has three through holes for adapting to the installation of the interface sleeve 106. Correspondingly, the position and number of the ultrasonic vibration rods 107 arranged on the left end cover 101 are adapted to the position and number of the through holes of the middle partition plate 103.

[0029] Flushing working methods and steps:

[0030] like Figure 2-3, the first step is to install the filter element 17: remove the bolts connecting the flange 104 and the right end cover 105 to open the right cavity of the outer cylinder 102, select the interface sleeve 106 that matches the specification of the filter element 17 and insert it into the through hole of the middle partition 103, select the installation position of the interface sleeve 106 that matches the filter element 17 to be cleaned and install the filter element 17, put the ultrasonic vibration rod 107 into the filter element 17, and the right ring platform 106-2 cooperates with the inner hole of the filter element 17. Bolt the flange 104 and the right end cover 105 to cover the right cavity, satisfying M2 + filter element length = M3, thereby realizing the positioning of the filter element 17.

[0031] like Figure 1-2 , the second step, the steps of graded circulation flushing method:

[0032] Step 1, the first filtering cycle, the electric valves D4, D5, D9, D10, D2, and D1 are closed, the diaphragm pump 12 is working, the circulating fluid is drawn from the first flushing box 6, and the circulating fluid is output from the pressure port of the diaphragm pump 12 through the second one-way valve 15 and the second absorbent cotton wire-wound filter 16, and enters the left cavity of the backwashing device 1 from the upper inlet 108. The flushing fluid in the left cavity enters the plate body through-hole of the middle partition plate 103 and the axial through-hole of the interface sleeve 106 to enter the inner hole of the filter element 17, and passes through the filter element 17 cylinder filter screen from the inside to the outside. The impurities in the filter element 17 body are discharged, and the ultrasonic vibrator 107 works at the same time to generate ultrasonic vibration, and The vibration energy is emitted into the liquid to promote efficient separation of impurities filtered by the filter element 17 body and the filter screen. The flushing liquid containing impurities flows out from the second lower outlet 110, the third lower outlet 111, and the upper outlet 112, and flows back to the first flushing tank 6 through the strong magnetic filter 2, the bag filter 3, and the first absorbent cotton wire-wound filter 4 connected in series in sequence. The flushing liquid passes through the strong magnetic filter 2, the bag filter 3, and the first absorbent cotton wire-wound filter 4 to filter impurities, and can process and filter magnetic impurities, particles, suspended matter, etc. The blockage of the bag filter 3 can be determined by the pressure difference of the pressure gauges set before and after.

[0033] Step 2, after continuous circulation filtration for a certain period of time, according to the circulation resistance of the pressure gauge 5, the filter elements of the strong magnetic filter 2, the bag filter 3, the first absorbent cotton wire-wound filter 4, and the second absorbent cotton wire-wound filter 16 through which the flushing liquid passes are replaced.

[0034] Step 3, second filtration cycle, electric valves D4, D5, D8, D10, D3, D1 are closed, diaphragm pump 12 is working, circulating fluid is drawn from second flushing box 7, output from pressure port of diaphragm pump 12 through second one-way valve 15, second absorbent cotton wire-wound filter 16, enter left cavity of backwashing device 1 from upper inlet 108, flushing fluid in left cavity enters through hole of middle partition plate 103 plate body, axial through hole of interface sleeve 106, enters inner hole of filter element 17, passes through cylinder of filter element 17 from inside to outside The impurities in the filter screen and the filter element 17 body are discharged, and the ultrasonic vibration rod 107 works at the same time to generate ultrasonic vibration and emit this vibration energy into the liquid, thereby promoting the efficient separation of the impurities filtered by the filter element 17 body and the filter screen. The flushing liquid containing impurities flows out from the second lower outlet 110, the third lower outlet 111, and the upper outlet 112, and flows back to the second flushing tank 7 through the strong magnetic filter 2, the bag filter 3, and the first absorbent cotton wire-wound filter 4 connected in series in sequence, and step 2 is repeated.

[0035] Step 4, the third filtering cycle, the electric valves D4, D5, D8, D9, D3, and D2 are closed, the diaphragm pump 12 is working, the circulating fluid is drawn from the third flushing box 8, and the circulating fluid is output from the pressure port of the diaphragm pump 12 through the second one-way valve 15 and the second absorbent cotton wire-wound filter 16, and enters the left chamber of the backwashing device 1 from the upper inlet 108. The flushing fluid in the left chamber enters the through hole of the middle partition plate 103 and the axial through hole of the interface sleeve 106, and enters the inner hole of the filter element 17, and passes through the cylinder of the filter element 17 from the inside to the outside. The impurities in the filter screen and the filter element 17 body are discharged, and the ultrasonic vibration rod 107 works at the same time to generate ultrasonic vibration and emit this vibration energy into the liquid, thereby promoting the efficient separation of the impurities filtered by the filter element 17 body and the filter screen. The flushing liquid containing impurities flows out from the second lower outlet 110, the third lower outlet 111, and the upper outlet 112, and flows back to the third flushing box 8 through the strong magnetic filter 2, the bag filter 3, and the first absorbent cotton wire-wound filter 4 connected in series in sequence, and step 2 is repeated.

[0036] like Figure 1-2 , Step 3, drain the flushing fluid:

[0037] The diaphragm pump 12 stops working, the electric valve D4 opens, and the compressed gas is introduced from the gas source input port 13, passes through the first one-way valve 14 and the second absorbent cotton wire-wound filter 16 in sequence, and enters the backwashing device 1 from the upper inlet 108. The electric valves D5 and D6 are opened, and any one of the electric valves D8, D9, and D10 is opened. The flushing liquid in the left and right chambers of the backwashing device 1 flows back from the electric valve D5 to the first flushing box 6 through the first lower outlet 109, the second lower outlet 110, and the third lower outlet 111 at the low position, and flows back from the electric valve D6 through the initial filtration circuit to the flushing box connected to any one of the opened electric valves D8, D9, and D10. The second one-way valve 15 prevents the compressed gas from entering the diaphragm pump 12 in reverse.

[0038] After the flushing liquid is purged and emptied, the diaphragm pump 12 is stopped, the electric valves D4, D5, D6, and D7 are closed, the right end cover 105 is opened, and the filter element is taken out for drying and storage.

[0039] like Figure 1-2 , flushing liquid circulation filtration:

[0040] The first flushing box 6 is used as a primary filter box, and there are many pollutants. Therefore, it is necessary to independently perform the circulating filtration treatment of the flushing liquid. At this time, the left chamber of the backwashing device 1 is used as a circulating flow chamber, and the environmental state and working state in the right chamber are not affected by the circulating filtration of the flushing liquid, that is, the circulating filtration of the flushing liquid can be performed in any state, specifically: the electric valve D4 is closed, the diaphragm pump 12 is working, and the circulating liquid is output from the pressure port of the diaphragm pump 12 through the second one-way valve 15 and the second absorbent cotton wire-wound filter 16, and enters the left chamber of the backwashing device 1 from the upper inlet 108 , enters the first flushing box 6 through the first lower outlet 109 connected to the left cavity and the opened electric valve D5, and then flows back from the first flushing box 6 to the inlet of the diaphragm pump 12 through the opened electric valve D3. The above constitutes a flushing liquid circulation filtration closed loop, which mainly filters the first flushing box 6, the left cavity of the backwashing device 1 and the main circuit. The second absorbent cotton wire-wound filter 16 plays a role in filtering pollutants in this process. The blockage of the filter element of the second absorbent cotton wire-wound filter 16 is judged by the pressure difference value of the pressure gauge set before and after it, so as to replace the filter element.

[0041] Cleaning liquids with solvents in different proportions can also be added to the first flushing box 6, the second flushing box 7, and the third flushing box 8 respectively. The cleaning liquids in the first flushing box 6, the second flushing box 7, and the third flushing box 8 can also be heated to different temperatures respectively. When performing the second step of graded circulation flushing, the third step of emptying the flushing liquid procedure can be inserted between each level of circulation steps to realize the discharge of cleaning liquids with solvents at different temperatures and in different proportions back to the corresponding flushing box, thereby achieving the purpose of graded circulation flushing, which is more effective for specific filter elements that are difficult to clean.

Claims

1. An ultrasonic backwashing filter element device, comprising a backwashing device (1) and a circulation system, characterized in that: The backwashing device (1) comprises a horizontally placed outer cylinder (102) provided with a flushing liquid output port and an input port, the outer cylinder (102) having a left end cover (101) and a right end cover (105) that can be opened and closed, the left end cover (101) and the right end cover (105) enclosing the outer cylinder (102) to form a closed inner cavity, a middle partition (103) is further provided in the outer cylinder (102), the middle partition (103) dividing the inner cavity of the outer cylinder into a left cavity and a right cavity, the input port being connected to the left cavity, the output port being connected to the right cavity, the middle partition (103) being distributed with through holes, an interface sleeve (106) being adapted to be mounted in the through holes and being located in the right cavity, the interface sleeve (106) being provided with an axial through hole, a left ring platform (101) and a right ring platform (103) 06-1) and a right annular platform (106-2), the left annular platform (106-1) being matched with the through hole gap, the right annular platform (106-2) being matched with the inner hole of the filter element end, the left end cover (101) being fixedly provided with an ultrasonic vibration rod (107) extending into the body of the outer cylinder (102), the ultrasonic tool head of the ultrasonic vibration rod (107) passing through the interface sleeve (106) extending to the right cavity, the interface sleeve (106) and the right end cover (105) clamping and positioning the filter element and fixing it in the right cavity of the outer cylinder (102), an annular gap for fluid to pass is reserved between the axial through hole of the interface sleeve (106) and the ultrasonic vibration rod (107) passing therethrough, so that the inner cylinder of the filter element is connected to the left cavity; The circulation loop comprises: a loop consisting of a strong magnetic filter (2), a bag filter (3), a first absorbent cotton wire-wound filter (4), a flushing tank, a circulation power source, and a second absorbent cotton wire-wound filter (16) connected in sequence, wherein the outlet of the second absorbent cotton wire-wound filter (16) is connected to the input port of the backwashing device (1), and the output port of the backwashing device (1) is connected to the inlet of the strong magnetic filter (2).

2. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: The flushing box comprises a first flushing box (6), a second flushing box (7), and a third flushing box (8), the outlets and inlets of the three flushing boxes are respectively provided with independently controlled electric valves, the input ports before the inlet electric valves of the three flushing boxes are connected to each other and merged, the output ports after the outlet electric valves of the three flushing boxes are connected to each other and merged, the outlet of the first absorbent cotton wire-wound filter (4) is connected to the merged input ports of the three flushing boxes, the merged output ports of the three flushing boxes are connected to the inlet of the circulating power source, and the flushing liquid output port of the backwashing device (1) comprises: a flushing liquid output port provided at the lower part of the outer cylinder (102) and connected to A first lower outlet (109) connected to the left chamber, a second lower outlet (110) and a third lower outlet (111) arranged at the lower part of the outer tube (102) and connected to the right chamber, and an upper outlet (112) arranged at the upper part of the outer tube (102) and connected to the right chamber, the first lower outlet (109) being connected to the first flushing box (6) via an electric valve, the second lower outlet (110) and the third lower outlet (111) being connected to the inlet of the strong magnetic filter (2) via an electric valve after merging, and the upper outlet (112) being connected to the inlet of the strong magnetic filter (2) via an electric valve.

3. The device for ultrasonic backwashing a filter element according to claim 2, characterized in that: The circulation loop is provided with a logic element and a gas-liquid switching loop for flushing liquid discharge, specifically, a second one-way valve (15) is provided at the outlet of the circulation power source, and an air source input branch is provided between the second one-way valve (15) and the second absorbent cotton wire-wound filter (16), and the air source input branch comprises: an electric valve and a first one-way valve (14) which are sequentially provided in the branch after being connected to the air source input port (13).

4. The device for ultrasonic backwashing a filter element according to claim 3, characterized in that: The circulation power source is a diaphragm pump (12), pressure gauges are respectively provided before and after the loop of the bag filter (3), and pressure gauges are respectively provided before and after the loop of the second absorbent cotton wire-wound filter (16).

5. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: A respirator (9) is arranged on the flushing box body, a liquid level meter (10) is arranged on the side of the box body, and a heater (11) is arranged inside the box body.

6. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: The outer cylinder (102) is opened and closed by providing a flange (104) at the right end thereof and connecting the flange with the right end cover (105) through bolts.

7. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: The backwashing device (1) has three filter element installation positions, and the middle partition plate (103) has three through holes for fitting the interface sleeve (106). Correspondingly, the positions and number of ultrasonic vibration rods (107) provided on the left end cover (101) are adapted to the positions and number of the through holes of the middle partition plate (103).

8. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: The interface sleeve (106) is detachable and replaceable, the outer diameter of the right ring platform (106-2) is adaptively changed according to the inner diameter of the filter element and the connection end thereof, and the length of the interface sleeve is adaptively changed according to the length of the filter element.

9. The device for ultrasonic backwashing a filter element according to claim 1, characterized in that: The effective extension section length of the ultrasonic tool head covers the length of the right cavity.

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