CN111249811A - An air filter bottle for medical atomization self-cleaning filter - Google Patents

Abstract

The invention discloses an air filter bottle of a medical atomization self-cleaning filter screen, which comprises an inlet pipe and an outlet pipe, wherein the inlet pipe is communicated with a branch pipe, the branch pipe is divided into two branch parts, each branch part is communicated with a filter vat, a filter screen is fixedly connected in the filter vat, the top wall of the filter vat is communicated with a second connecting pipe and a third connecting pipe, the two second connecting pipes are communicated with a third connecting pipe and an outlet pipe through a cross, the two third connecting pipes are uniformly communicated with the branch pipes, the bottom of the filter vat is communicated with a fourth connecting pipe, the two fourth connecting pipes are both communicated with the outlet pipe, and a back washing device is arranged in the filter vat. The invention has the function of self-cleaning the filter screen, realizes different pipeline flow directions under normal work and the cleaning of the filter screen by changing the change of the gas flow channel, and simultaneously can not stop outputting liquid medicine due to the process of self-cleaning the filter screen when carrying out atomization treatment, thereby avoiding influencing the treatment.

Description

An air filter bottle for medical atomization self-cleaning filter

technical field

The invention relates to the technical field of medical atomization devices, in particular to an air filter bottle for medical atomization self-cleaning filter screens.

Background technique

Atomization refers to the operation of decomposing a liquid into tiny droplets through a nozzle or high-speed airflow. Atomization treatment mainly refers to aerosol inhalation therapy. Atomization inhalation therapy uses an atomized device to disperse a drug into tiny droplets or particles. , make it suspended in the gas, and enter the respiratory tract and lungs to clean the airway, humidify the airway, and achieve the purpose of local treatment and systemic treatment.

In the prior art, the atomized liquid medicine generally uses compressed air as power to output the atomized liquid medicine, and during use, since the compressed air will contain dust or impurities in the air, it is often used when the compressed air enters. The filter will be used for filtration, but the filter needs to be cleaned manually after long-term use, and because the installation position of the filter is inside the atomization equipment, manual cleaning is relatively inconvenient, and manual cleaning needs to disassemble the device to stop the atomization of the liquid. The output work affects the treatment in the state of first aid or emergency. Based on this, the present invention designs an air filter bottle with a medical atomization self-cleaning filter screen.

SUMMARY OF THE INVENTION

The purpose of the present invention is to propose a self-cleaning water dispenser in order to solve the problem that the water dispenser cleaning device in the prior art is cumbersome to operate and does not have the function of automatic cleaning.

In order to achieve the above purpose, the present invention adopts the following technical scheme: an air filter bottle for medical atomization self-cleaning filter screen, including an inlet pipe and an outlet pipe, the inlet pipe is connected with a branch pipe, and the branch pipe is divided into two branches The end of each branch part away from the inlet pipe is connected with a filter barrel, a filter screen is fixedly connected in the filter barrel, and the top wall of the filter barrel is connected with a second connection pipe and a third connection Two of the second connecting pipes are connected to each other and are connected to a first connecting pipe and an outlet pipe through a spool. The two ends of the first connecting pipe are respectively connected to the branch pipe and the outlet pipe. The pipes are evenly connected to the branch pipes, the bottom of the filter barrel is connected with a fourth connection pipe, both of the fourth connection pipes are connected with the outlet pipe, and a backwashing device is arranged in the filter barrel;

The backwashing device includes a transmission structure and a linkage structure, the transmission structure includes a sliding box arranged on two branch parts, the sliding box is fixedly connected to the bottom of the branch pipe and communicates with the inside of the branch pipe, and the sliding box is sealed and slidable inside. A slider is connected, and a push rod is fixedly connected to the bottom of the slider, and the push rod penetrates both the sliding box and the top of the filter barrel. The part of the push rod in the filter barrel is sleeved with a square block, and the square block The side wall is rotatably connected with a plurality of rotating plates, and the multiple rotating plates jointly seal the inner wall of the filter screen and divide the filter screen into an upper space and a lower space, and the third connecting pipe simultaneously seals through the top wall of the filter barrel and the rotating plate. The plate is inserted into the lower space, the end of the rotating plate away from the square block is rotatably connected with a moving block, the moving block is sealed and slidably connected to the inner wall of the filter screen, and the end of the push rod away from the slider is fixedly connected with a seal a plate; the top of the square block is provided with a first spring and the fixed end of the first spring is provided at the center of the top of the filter barrel, and the first spring is sleeved outside the push rod;

The linkage device includes a moving rod that is vertically and fixedly connected to the part of the push rod outside the filter barrel, an end of the moving rod away from the push rod is abutted against a block, and the outlet pipe is provided with a sealing box with a diameter larger than the radius of the outlet pipe. , the inside of the sealing box is provided with a baffle whose diameter is larger than the diameter of the outlet pipe and smaller than the diameter of the sealing box. The fixed end of the spring and the second spring is arranged on the inner wall of the outlet pipe below the baffle.

In the above-mentioned air filter bottle for medical atomization self-cleaning filter screen, a first pressure valve is provided in the part of each branch part between the filter barrel and the third connection pipe, and the first connection pipe is provided with a first pressure valve. There is a second pressure valve in the pipe, the third connecting pipe is made of PU hose material, the connection between the second connecting pipe and the filter barrel is located at the outer ring part of the filter screen, and the fourth connecting pipe is connected to the filter barrel. The connection is located at the bottom center of the filter bucket.

In the above-mentioned air filter bottle for medical atomization self-cleaning filter screen, the filter screen is divided into two parts, which are formed by integral molding and connected by two annular structures, and the upper layer adopts a funnel structure with a wide upper and a narrow lower; the lower layer adopts a thin-walled cylinder. The diameter of the connection between the upper layer and the lower layer is the same. The sealing plate is composed of a ring magnet and a circular iron block. The circular iron block is sealed and slidingly connected to the inner wall of the lower layer of the filter screen. The shaped iron blocks are of the same height, and the inner and outer sides are sealed and fitted with the inner wall of the lower layer of the filter screen and the inner wall of the filter barrel respectively, and the ring magnet and the circular iron block are magnetically attracted.

Compared with the prior art, the advantages of the present invention are:

1. In the present invention, the compressed air is entered through the inlet pipe, and the two branch parts of the branch pipe divide the incoming air into two parts, which respectively enter the corresponding filter barrels, and pass through the second connecting pipe under the action of the filter screen in the filter barrel. It flows out through the outlet pipe under the action of the connection, so that the atomization equipment powered by air will not cause the dust or impurities in the air mixed with the spray of the atomized liquid medicine, which will affect the health of the patient;

2. At the same time, when a filter is used for a long time, dust accumulates on the filter, because a large amount of dust is attached to the filter in the filter bucket at this time, the filtration efficiency will decrease, and the input air velocity to the filter is greater than that of the air. The air discharged through the filter screen will gradually increase the volume in the filter screen, so that the square block of the slider moves up under the action of air pressure, on the one hand, it drives the sealing plate to move, and on the other hand, the slider seal corresponds to The branch part, at this time, because one branch part is sealed, the gas entering from the inlet pipe can only achieve the effect of backwashing the inside of the filter screen through the other branch part, so as to shake off the dust in the blocked filter holes on the filter screen. , to achieve the function of cleaning a filter;

3. When the dust accumulation occurs on the two filters at the same time, the two sliders seal the corresponding branch parts respectively, and the gas entering from the inlet pipe will break through the second pressure valve and enter the first connecting pipe, while the first The connecting pipe is communicated with the second connecting pipe, so that the gas is divided into two parts and enters the inside of the filter barrel through the second connecting pipe respectively, and continues to realize the function of backwashing the inner wall of the filter screen;

4. After backwashing the dust from the filter screen, the incoming gas will be discharged from the third connecting pipe and break through the first pressure valve to re-enter the filter barrel. At this time, the sealing plate divides the filter barrel into two parts. Independent filter space, the gas enters the branch pipe from the upper space and then returns to the lower space. It will enter the fourth connecting pipe and then output through the outlet pipe under the action of the filter screen. The output of the gas prevents the output of the liquid medicine from being stopped due to the process of spontaneously cleaning the filter screen during atomization treatment, so as to avoid affecting the treatment.

5. The present invention simultaneously realizes the sealing of the slider and the upward movement of the sealing plate through the push rod when the air pressure increases. The principle of enlargement meets the requirements of gas expansion under air pressure, and the upward movement of the push rod will drive the moving rod and the abutment block to move up at the same time, and the two abutment blocks are offset against the baffle. It can realize the sealing of the baffle to the outlet pipe, and realize the change of the gas flow direction of the pipeline.

6. The setting of the first pressure valve and the second pressure valve makes the pressure valve close the pipeline channel where the gas flows normally, so that the gas flows normally, and when the slider or the baffle seals the pipeline channel, the gas pressure Under the action, the gas will break through the pressure valve, realize the change of the gas flow channel, realize the different flow direction of the pipeline under normal operation and under the operation of cleaning the filter screen, and will not affect the normal gas flow state.

Description of drawings

Fig. 1 is the structural representation of the air filter bottle of a kind of medical atomization self-cleaning filter screen proposed by the present invention;

Fig. 2 is the enlarged schematic diagram of part A in the air filter bottle of a kind of medical atomization self-cleaning filter screen proposed by the present invention;

Fig. 3 is the enlarged schematic diagram of part B in the air filter bottle of a kind of medical atomization self-cleaning filter screen proposed by the present invention;

Fig. 4 is a kind of pipeline flow diagram of normal working in the air filter bottle of the medical atomization self-cleaning filter screen proposed by the present invention;

Fig. 5 is a kind of pipeline flow diagram of cleaning a filter screen in an air filter bottle of a medical atomization self-cleaning filter screen proposed by the present invention;

Fig. 6 is a pipeline flow diagram of simultaneously cleaning two filters in an air filter bottle of a medical atomization self-cleaning filter provided by the present invention.

In the figure: 1 inlet pipe, 2 branch pipes, 3 first connection pipe, 4 second connection pipe, 5 third connection pipe, 6 fourth connection pipe, 7 outlet pipe, 8 filter barrel, 9 filter screen, 10 sealing plate, 11 sliding box, 12 sliding block, 13 push rod, 14 square block, 15 turning plate, 16 moving block, 17 first spring, 18 moving rod, 19 sealing box, 20 baffle, 21 block, 22 second spring, 23 first pressure valve, 24 second pressure valve.

Detailed ways

The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

Example

1-6, an air filter bottle for medical atomization self-cleaning filter screen, including an inlet pipe 1 and an outlet pipe 7, the inlet pipe 1 is communicated with a branch pipe 2, and the branch pipe 2 is divided into two branch parts, and each branch is divided into two branch parts. The end of the road part away from the inlet pipe 1 is connected with a filter barrel 8, and a filter screen 9 is fixedly connected in the filter barrel 8. The filter screen 9 is a column structure with a wide upper and a narrow lower, and the cross-sections of the two symmetrical sides are vase-shaped. , the top wall of the filter barrel 8 is connected with the second connecting pipe 4 and the third connecting pipe 5, the two second connecting pipes 4 are connected with each other and are connected with the first connecting pipe 3 and the outlet pipe 7 through the four-way, the first connecting pipe The two ends of 3 are respectively connected with the branch pipe 2 and the outlet pipe, the two third connecting pipes 5 are evenly connected with the branch pipe 2, the bottom of the filter barrel 8 is connected with a fourth connecting pipe 6, and the two fourth connecting pipes 6 are both connected with the outlet pipe 7. connected, the filter barrel 8 is provided with a backwashing device;

The backwash device includes a transmission structure and a linkage structure. The transmission structure includes a sliding box 11 arranged on the two branch parts. The sliding box 11 is fixedly connected to the bottom of the branch pipe 2 and communicates with the inside of the branch pipe 2. The sliding box 11 is located at the right-angle corner of the branch pipe 2. The sliding box 11 is sealed and slidably connected with the sliding block 12. The thickness of the sliding block 12 is the same as the thickness of the inner wall of the branch pipe 2. When the sliding block 12 slides up, the position of the branch pipe 2 above the sliding block 12 will be sealed, and the sliding block 12 will be sealed. 12 A push rod 13 is fixedly connected to the bottom, and the push rod 13 penetrates the top of the sliding box 11 and the filter barrel 8 at the same time. The part of the push rod 13 in the filter barrel 8 is sleeved with a square block 14. A plurality of rotating plates 15, there are two rotating plates 15, which are symmetrically arranged on both sides of the square block 14, so that the two rotating plates jointly seal the inner wall of the filter screen 9, and the filter screen 9 is divided into an upper space and a lower space, The third connecting pipe 5 is sealed through the rotating plate (15) and inserted into the lower space. The upper space and the lower space are independent of each other. After the inner wall of the filter screen 9 is full of dust, the upper space will be in a relatively sealed environment, and the rotating plate 15 will be kept away from each other. One end of the square block 14 is rotatably connected with a moving block 16, and the moving block 16 is sealed and slidably connected to the inner wall of the filter screen 9. When the square block 14 moves up, a plurality of moving blocks 16 will move up at the same time, so that the turning plate 15 is finally in the position. In the horizontal state, the end of the push rod 13 away from the slider 12 is fixedly connected to the sealing plate 10; the top of the square block 14 is provided with a first spring 17 and the fixed end of the first spring 17 is located at the center of the top of the filter barrel 8. The first spring The position of the square block 14 is determined by the elastic force of the first spring 17, and the square block 14 cannot be moved when normally installed.

The linkage device includes a moving rod 18 that is vertically and fixedly connected to the part of the push rod 13 outside the filter barrel 8. The end of the moving rod 18 away from the push rod 13 is abutted against a block 21, and the outlet pipe 7 is provided with a diameter larger than the radius of the outlet pipe 7. The sealing box 19, the sealing box 19 is provided with a baffle plate 20 with a diameter larger than the diameter of the outlet pipe 7 and smaller than the diameter of the sealing box 19. Two abutting blocks 21 are symmetrically arranged on the outer ring of the baffle plate 20 and abut against its bottom. 21 After pushing the baffle 20 upward and making the baffle 20 abut against the top of the sealing box 19, since the diameter of the baffle 20 is larger than the inner diameter of the outlet pipe 7, the baffle 20 will seal the outlet pipe 7, so that the flow channel of the fluid changes, and the baffle The bottom of 20 is fixedly connected with a second spring 22 and the fixed end of the second spring 22 is arranged on the inner wall of the outlet pipe 7 located below the baffle 20. The second spring 22 is used to determine the initial position of the baffle 20, and under the action of elastic force The outlet pipe 7 is kept in circulation during normal operation.

A first pressure valve 23 is provided in the part of each branch between the filter barrel 8 and the third connecting pipe 5 , and a second pressure valve 24 is arranged in the first connecting pipe 3 , and the two pressure valves are working normally. In this state, because the gas pressure cannot reach the opening pressure of the pressure valve, it is in a closed state. When the slider 12 or the baffle 20 seals the corresponding pipeline space, the pressure valve will be broken under the action of air pressure, and the effect of changing the gas flow channel is realized. , and does not affect normal work, the third connecting pipe 5 is made of PU hose material, which has the ability to deform, so that when the turning plate 15 rotates under the action of air pressure, the third connecting pipe 5 has a deformation space to avoid causing the first The gap between the three connecting pipes 5 and the rotating plate 15, the connection between the second connecting pipe 4 and the filter barrel 8 is located in the outer ring part of the filter screen 9, so that the gas from the inside of the filter screen 9 passes into the outer ring under the action of filtration and To output clean air, the connection between the fourth connection pipe 6 and the filter barrel 8 is located at the bottom center of the filter barrel 8. When the sealing plate 10 is located at the bottom of the filter barrel 8, the fourth connection pipe 6 and the branch pipe 2 are connected to the filter barrel 8. The joints are sealed, and when the sealing plate 10 is moved up by the push rod 13, the fourth connecting pipe 6 is unsealed and the air entering the lower filter barrel through the branch pipe 2 is filtered again and then output.

The filter screen 9 is divided into two parts, which are formed by integral molding and connected by two annular structures, and the upper layer adopts a funnel structure that is wide at the top and narrow at the bottom; The ring magnet is composed of a circular iron block. The circular iron block is sealed and slidably connected to the inner wall of the lower layer of the filter screen 9. The ring magnet is at the same height as the circular iron block, and the inner and outer sides are sealed with the lower inner wall of the filter screen 9 and the inner wall of the filter barrel 8 respectively. Fitting, the ring magnet and the round iron block attract each other, so that when the round iron block moves up under the action of the push rod 13, the ring magnet moves up synchronously under the action of magnetic attraction, and jointly seals the inner wall of the filter barrel 8, so that the filter The barrel 8 is divided into two filter spaces.

When the present invention is in use, in the normal working state, as shown in Figure 4, the compressed air enters through the inlet pipe 1, and enters the inner ring of the filter screen 9 through the third connecting pipe 5 under the diversion effect of the branch pipe 2, and the compressed air is compressed. The continuous entry of the gas will cause the gas in the inner ring to spread outward, enter the outer ring of the filter screen 9 under the filtering action of the filter screen 9, and be discharged through the second connecting pipe 4 and the outlet pipe 7, realizing the normal working condition. gas filtration work;

In this state, the flow rate of the gas entering the filter barrel 8 and the gas flowing out of the filter barrel 8 is the same per unit time, so the inside and outside of the filter barrel 8 maintain a dynamic balance. At this time, the sealing plate 10 is at the bottom of the filter barrel 8, and the first spring 17 maintains its natural length. , and the moving rod 18 is at the low end outside the filter barrel 8, and the baffle 20 cannot seal the outlet pipe 7;

However, when one of the filter buckets 8 has a phenomenon of dust accumulation, since the filtering direction of the filter screen 9 is always from the inside to the outside, a large amount of dust is always accumulated on the inside of the filter screen 9. At this time, because the filtering effect is reduced, and the filter holes are a lot of Blockage is equivalent to the sealing of the inner space of the filter screen 9, so that the inflow rate of the gas is greater than the outflow rate per unit time, so the air pressure of the inner space of the filter screen 9 becomes larger. force, and the space sealed by the filter screen 9, the rotary plate 15, and the sealing plate 10 will have a tendency to increase the relative space when sliding upwards, and the air pressure will drive this trend to realize the upward sliding of the push rod 13, and with The sliding block 12, the moving rod 18, and the sealing plate 10, which are fixedly connected to the push rod 13, achieve three functions at the same time. The movement of the sliding block 12 will seal the corresponding branch; The baffle plate 20 finally seals the outlet pipe 7; the upward movement of the sealing plate 10 will make the connection between the branch pipe 2 and the filter barrel 8 open and end the sealing state of the fourth connecting pipe 6 at the same time, and at the same time divide the filter barrel 8 into two upper and lower parts. Independent filter space;

The final flow direction of the gas is shown in FIG. 5 , the gas passes through the filter barrel 8 on the other side without dust deposition, and enters the second connecting pipe 4 after filtering. Since the outlet pipe 7 is sealed, the gas passes through the filter on the other side The second connecting pipe 4 enters the inside of the upper filter space of the filter barrel 8 to be cleaned in the reverse direction, and is input from the outside of the filter screen 9 inward. At this time, the dust on the inside is removed and enters the third connecting pipe 5 with the reverse of the air. , after breaking the pressure valve on the branch pipe 2, it enters the lower filter space of the filter barrel 8, and after re-filtering, it enters the outlet pipe 7 through the fourth connecting pipe 6 and outputs it; the advantage of this is that the process of cleaning the dust on the filter screen will not Affects the discharge of compressed air, so that the compressed air will not stop the output of the atomized liquid medicine during self-cleaning, so that the atomized liquid medicine always presents a continuous output state, and the input of the liquid medicine will not be disconnected, so that in the In emergency state, always use clean compressed air to drive atomized liquid medicine to treat patients to improve the treatment effect;

And when the two filters 9 appear dust accumulation at the same time, the air at the inlet will break through the second pressure valve 24 and enter the filter barrel 8 in the reverse direction through the first connecting pipe 3, and the subsequent flow principle is the same as the above-mentioned one filter The process of 9 is the same, and the gas flow channel can be referred to as shown in FIG.

To sum up, when the content of impurities in the air is not large and it is not necessary to remove all the dust, the backwash principle in the device is used to continuously remove the dust accumulated on the filter screen 9, so that the output will not affect the air. The cleanliness is high, which is beneficial to the treatment of patients in medical atomization equipment, especially in first aid or rescue state, realizes the effect of self-cleaning filter 9, and reduces the workload of staff.

Although this article uses the inlet pipe 1, the outlet pipe 2, the first connecting pipe 3, the second connecting pipe 4, the third connecting pipe 5, the fourth connecting pipe 6, the outlet pipe 7, the filter barrel 8, and the filter screen 9 more , sealing plate 10, sliding box 11, sliding block 12, push rod 13, square block 14, turning plate 15, moving block 16, first spring 17, moving rod 18, sealing box 19, baffle 20, abutting block 21, Terms such as second spring 22, first pressure valve 23, second pressure valve 24, etc., do not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitation.

Claims (3)

1. The utility model provides an air filter bottle of medical atomizing self-cleaning filter screen, includes into pipe (1) and exit tube (7), its characterized in that, it has branch pipe (2) to advance pipe (1) intercommunication, branch pipe (2) divide into two branch road parts, every branch road part keep away from the end of advancing pipe (1) and all communicate filter vat (8), filter vat (8) internal fixation is connected with filter screen (9), the roof intercommunication of filter vat (8) has second connecting pipe (4) and third connecting pipe (5), two second connecting pipe (4) intercommunication and through the cross intercommunication have first connecting pipe (3) and exit tube (7), the both ends of first connecting pipe (3) communicate with branch pipe (2) and exit tube respectively, two third connecting pipe (5) evenly correspond branch pipe (2) intercommunication, filter vat (8) bottom intercommunication has fourth connecting pipe (6), the two fourth connecting pipes (6) are both communicated with an outlet pipe (7), and a backwashing device is arranged in the filter barrel (8);

the backwashing device comprises a transmission structure and a linkage structure, the transmission structure comprises sliding boxes (11) arranged at two branch parts, the sliding boxes (11) are fixedly connected at the bottom of the branch pipes (2) and communicated with the insides of the branch pipes (2), sliding blocks (12) are connected in the sliding boxes (11) in a sealing and sliding manner, push rods (13) are fixedly connected at the bottoms of the sliding blocks (12), the push rods (13) penetrate through the tops of the sliding boxes (11) and the filter barrel (8) at the same time, square blocks (14) are sleeved at the parts of the push rods (13) in the filter barrel (8), the side walls of the square blocks (14) are rotatably connected with a plurality of rotating plates (15), the rotating plates (15) seal the inner wall of the filter screen (9) together and divide the filter screen (9) into an upper layer space and a lower layer space, and a third connecting pipe (5) penetrates through the top wall of the filter barrel (8) and the rotating plates (15) at the same time and is inserted, one end of the rotating plate (15), which is far away from the square block (14), is rotatably connected with a moving block (16), the moving block (16) is connected to the inner wall of the filter screen (9) in a sealing and sliding manner, and one end of the push rod (13), which is far away from the slide block (12), is fixedly connected with a sealing plate (10); the top of the square block (14) is provided with a first spring (17), the fixed end of the first spring (17) is arranged at the center of the top of the filter barrel (8), and the first spring (17) is sleeved outside the push rod (13);

linkage includes movable rod (18) of perpendicular fixed connection in push rod (13) part outside filter vat (8), the one end that push rod (13) were kept away from in movable rod (18) offsets and has supported piece (21), set up diameter and be greater than exit tube (7) radial seal box (19) in exit tube (7), seal box (19) inside is equipped with diameter and is greater than exit tube (7) baffle (20) that diameter is less than seal box (19) diameter, two support piece (21) symmetry and establish in the outer lane of baffle (20) and offset rather than the bottom, baffle (20) bottom fixedly connected with second spring (22) and the stiff end of second spring (22) are established on the inner wall that is located baffle (20) below exit tube (7).

2. The air filter bottle of the medical atomizing self-cleaning filter screen according to claim 1, wherein a first pressure valve (23) is disposed at a portion of each branch portion between the filter vat (8) and the third connecting pipe (5), a second pressure valve (24) is disposed in the first connecting pipe (3), the third connecting pipe (5) is made of PU hose material, a joint of the second connecting pipe (4) and the filter vat (8) is located at an outer ring portion of the filter vat (9), and a joint of the fourth connecting pipe (6) and the filter vat (8) is located at a bottom center of the filter vat (8).

3. The air filter bottle of the medical atomization self-cleaning filter screen according to claim 1, wherein the filter screen (9) is divided into two funnel structures which are formed by integrally connecting two annular structures and have a wide upper layer and a narrow lower layer; the lower floor adopts thin wall cylinder mechanism, and the junction diameter of upper strata and lower floor is the same, closing plate (10) constitute jointly for an annular magnet and a circular iron plate, circular iron plate and filter screen (9) lower floor inner wall sealing sliding connection, annular magnet and circular iron plate are same height and the inside and outside respectively with filter screen (9) lower floor inner wall and filter vat (8) inner wall sealing laminating, annular magnet and circular iron plate inter attraction.

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