A multi-stage centrifugal pump

Abstract

This invention discloses a multistage centrifugal pump in the field of multistage centrifugal pump technology, including a pump casing, an outlet, a filter assembly, an inlet, a motor, and a drive shaft. The drive shaft extends into the interior of the filter assembly, and a filter plate and a sleeve are fixedly connected to the outer surface of the drive shaft. A centrifugal plate is fixedly connected to the right side of the filter plate, and filter holes are provided on the right side of the filter plate. The filter holes and the centrifugal plate are staggered. A placement groove is provided on the outer surface of the sleeve. This invention reduces the rotational speed of the cleaning plate by utilizing the brief jamming caused when the right side of the cleaning plate makes limiting contact with the inner wall of the filter assembly, eliminating centrifugal force. This allows a continuously stretched spring to pull the cleaning plate downward and smoothly move the cleaning plate to position ②, continuing to scrape impurities. This results in more thorough cleaning of impurities and prevents impurities from entering the pump casing and damaging the impeller.

Description

Technical Field

[0001] This invention relates to the field of multistage centrifugal pump technology, specifically to a multistage centrifugal pump. Background Technology

[0002] A multistage centrifugal pump is a pump body with two or more impellers built in and providing fluid channels. The centrifugal force generated by the high-speed rotation of the impeller drives the water flow, and the mechanical energy generated by the impeller is transferred to the water to form static pressure, causing the water to undergo centrifugal motion and be thrown to the outer edge of the impeller. The water then flows through the pump casing into the water pump's pressure pipeline. It has a high head and is used for pumping wastewater from mines.

[0003] Currently, in existing multistage centrifugal pumps used for pumping wastewater from mines, a filter assembly is typically installed at the inlet to handle particulate impurities such as gravel mixed in with the wastewater. This filter is used to prevent rigid impact damage to the impeller and potential deformation. The main method involves filtering particulate impurities from the wastewater through a filtration mechanism, then crushing them and passing them through the pump body. However, this method still allows impurities to pass through the impeller. The crushing mechanism is not effective for small impurities, which can still cause impeller damage when passing through the impeller. Therefore, it is necessary to block impurities inside and outside the pump body. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage centrifugal pump to solve the problems of incomplete cleaning and poor filtration effect mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage centrifugal pump, comprising a pump casing, the pump casing further comprising an outlet, a filter assembly, an inlet, a motor, and a drive shaft, the drive shaft extending into the interior of the filter assembly, a filter plate and a sleeve fixedly connected to the outer surface of the drive shaft, a centrifugal plate fixedly connected to the right side of the filter plate, a filter hole provided on the right side of the filter plate, the filter hole and the centrifugal plate being staggered, a placement groove provided on the outer surface of the sleeve, a connecting plate rotatably mounted on the inner wall of the placement groove via a connecting column, a slot provided on the other side of the connecting plate, a spring and a guide column movably sleeved inside the slot, a cleaning plate fixedly connected to the other end of the guide column, a sealing chamber fixedly connected to the back of the filter assembly, a sealing plate fixedly connected to the inner wall of the sealing chamber, a sealing strip sealed and snapped into the interior of the sealing chamber by the sealing plate, a linkage plate fixedly connected to the front of the sealing strip, and an elastic connection between the back of the sealing strip and the inner wall of the sealing chamber via an elastic clamping plate.

[0006] As a further embodiment of the present invention, the outlet is fixedly installed on the left side of the top of the pump casing, the output shaft of the motor is connected to the transmission shaft via a coupling, and the inlet is fixedly installed on the right side of the top of the pump casing.

[0007] As a further embodiment of the present invention, the longitudinal section of the cleaning plate is U-shaped, and a through hole is provided on the surface of the cleaning plate, and the top of the inner wall of the cleaning plate is fixedly connected to the guide post.

[0008] As a further embodiment of the present invention, the number of placement slots is three and they are distributed at equal angles on the outer surface of the sleeve. The longitudinal cross-sectional shape of the placement slots is "V" shaped, and the opening and closing angle of the placement slots is 80°.

[0009] As a further embodiment of the present invention, the number of cleaning plates is three and they are distributed at equal angles on the outer surface of the sleeve. When the top of the guide post is in a vertical state and contacts the top of the inner wall of the sealing chamber, the spring connected to the guide post is stretched and set inside the slot.

[0010] As a further embodiment of the present invention, the number of centrifuge plates is fifteen and they are fixedly connected at equal angles to the right side of the filter plate. The length of the centrifuge plate is less than the radius of the filter plate, and the thickness of the centrifuge plate gradually decreases from the outer edge of the filter plate to the center.

[0011] As a further embodiment of the present invention, there are two sealing plates connected sequentially on the upper and lower sides of the inner wall of the sealing chamber. The longitudinal cross-sectional shape of the sealing plate is an isosceles triangle, and the longitudinal cross-sectional shape of the sealing strip is rhomboid. The sealing strip and the sealing plate are sealed in contact by compression through an elastic clamping plate.

[0012] As a further embodiment of the present invention, the horizontal cross-sectional shape of the elastic plate is wavy, and the elastic plate is made of stainless steel.

[0013] As a further embodiment of the present invention, the number of linkage plates is two and they are respectively fixedly connected to the left and right sides of the front of the sealing strip, and the front end of the linkage plate coincides with the cross-section of the filter assembly.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention features a sleeve that rotates with the drive shaft, causing three equally angled connecting plates and a cleaning plate to rotate. The centrifugal force generated by the rotation of the connecting plates causes the other end of the cleaning plate to contact the inner wall of the filter assembly. This causes the spring to be moved and continuously stretched to position ① by the outward-moving guide post. At this point, the cleaning plate scrapes the inner wall of the filter assembly, pushing impurities backward into the sealed chamber. Then, the cleaning plate applies pressure to the linkage plate, causing the sealing strip to disengage from the sealing plate. The elastic retaining plate is compressed, discharging impurities along the gap between the sealing plate and the sealing strip. Then, the cleaning plate's rotation speed is reduced by a brief pause when its right side contacts the inner wall of the filter assembly, eliminating centrifugal force. The continuously stretched spring pulls the cleaning plate downward, allowing it to move smoothly to position ②, continuing to scrape impurities. This more thorough cleaning of impurities prevents them from entering the pump casing and damaging the impeller.

[0016] 2. Then, the drive shaft drives the filter plate to rotate at high speed, causing small-volume impurities suspended in the sewage to be filtered by the filter plate and retained on the right side of the filter plate. These impurities are separated by the centrifugal plate. When the filter plate rotates, the centrifugal plate moves the sewage in the centrifugal plate and generates centrifugal force, which moves the filtered small-volume impurities to the edge of the inner wall of the filter assembly. Then, the continuously rotating and scraping cleaning plate moves these small-volume impurities into the sealed chamber. In particular, the small-volume impurities moved to the top of the inner wall of the filter assembly directly enter position ①, and are then directly scraped and moved into the sealed chamber by the high-speed rotating cleaning plate, completing the filtration-type cleaning and improving the filtration efficiency.

[0017] 3. Finally, by setting up high-speed rotating filter plates, centrifugal plates and guide columns, the sewage entering the filter assembly is centrifuged in advance. The sewage, which is given mechanical energy, continuously passes through the filter holes and cleaning plates, increases its own kinetic energy and comes into contact with the impeller located inside the pump casing. The high-kinetic-energy sewage with centrifugal tendency can quickly fill the entire inner cavity of the pump casing, which doubles the speed at which the inner cavity of the pump casing is filled with water, and avoids the "air blasting phenomenon" in the early stage of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the rear view of the overall structure of the present invention;

[0020] Figure 3 This is a partial cross-sectional view of the overall structure of the present invention from the front.

[0021] Figure 4 This is a side cross-sectional view of the filter assembly of the present invention;

[0022] Figure 5 This is a side sectional view of the sleeve, connecting post, connecting plate, spring, guide post, and cleaning plate of the present invention;

[0023] Figure 6 This is a schematic diagram showing the separation of the sealed chamber, filter plate, centrifugal plate, sleeve, connecting plate, cleaning plate, elastic clamping plate, linkage plate and sealing strip of the present invention;

[0024] Figure 7 This is a top-view perspective sectional view of the sealed chamber of the present invention;

[0025] Figure 8 This is a schematic diagram showing the separation of the sleeve, connecting post, connecting plate, spring, guide post, and cleaning plate of the present invention.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Pump casing; 101. Outlet; 102. Filter assembly; 103. Inlet; 104. Motor; 105. Drive shaft; 2. Sealing chamber; 3. Filter plate; 4. Filter hole; 5. Centrifugal plate; 6. Sleeve; 7. Placement slot; 8. Connecting column; 9. Connecting plate; 10. Slot; 11. Spring; 12. Guide column; 13. Cleaning plate; 14. Through hole; 15. Sealing plate; 16. Elastic retaining plate; 17. Linkage plate; 18. Sealing strip. Detailed Implementation

[0028] Please see Figure 1-8 This invention provides a technical solution: a multi-stage centrifugal pump, including a pump casing 1, the pump casing 1 further including an outlet 101, a filter assembly 102, an inlet 103, a motor 104, and a drive shaft 105. The drive shaft 105 extends into the interior of the filter assembly 102. A filter plate 3 and a sleeve 6 are fixedly connected to the outer surface of the drive shaft 105. A centrifugal plate 5 is fixedly connected to the right side of the filter plate 3. Filter holes 4 are opened on the right side of the filter plate 3. The filter holes 4 and the centrifugal plate 5 are staggered. A placement groove 7 is opened on the outer surface of the sleeve 6. The inner wall of the placement groove 7 is... A connecting plate 9 is rotatably mounted on the connecting column 8. A slot 10 is provided on the other side of the connecting plate 9. A spring 11 and a guide column 12 are movably sleeved inside the slot 10. A cleaning plate 13 is fixedly connected to the other end of the guide column 12. A sealing chamber 2 is fixedly connected to the back of the filter assembly 102. A sealing plate 15 is fixedly connected to the inner wall of the sealing chamber 2. A sealing strip 18 is sealed and snapped into the inside of the sealing chamber 2 through the sealing plate 15. A linkage plate 17 is fixedly connected to the front of the sealing strip 18. The back of the sealing strip 18 is elastically connected to the inner wall of the sealing chamber 2 through an elastic clamping plate 16.

[0029] When this device is working, the inlet 103 is connected to the sewage discharge pipe, so that the sewage fills the inside of the pump casing 1. The device is started, and the motor 104 drives the impeller to rotate through the transmission shaft 105. The centrifugal force generated by the high-speed rotation of the impeller drives the sewage to move continuously to the left and generates static pressure, so that the sewage is discharged along the outlet 101. During the operation, the transmission shaft 105 simultaneously drives the filter plate 3 and the sleeve 6 to rotate.

[0030] Larger impurities in the wastewater fall directly to the bottom of the inner wall of the filter assembly 102. Smaller impurities flow with the wastewater. When the wastewater passes through the filter plate 3, it flows directly to the left along the filter holes 4, while the impurities are filtered by the filter plate 3 and rotated by the centrifugal plate 5. The centrifugal force generated by the rotation carries the smaller impurities towards the outer edge of the filter plate 3. When passing the surface of the cleaning plate 13, the sleeve 6 drives the connecting plate 9 and the cleaning plate 13 to rotate. At this time, the guide column 12 is subjected to centrifugal force and begins to move towards the tension spring 11, so that the other end of the cleaning plate 13 is always in close contact with the inner wall of the filter assembly 102. Figure 4 As shown, when the guide column 12 moves to position ①, its right side will push the impurities to the right into the interior of the sealing chamber 2. Then, it will continue to rotate clockwise. With the cooperation of the left side of the inner wall of the placement groove 7, it will drive the linkage plate 17 and the sealing strip 18 to the right, so that the elastic plate 16 is compressed and a gap appears between the sealing strip 18 and the sealing plate 15. The impurities will be discharged along the gap. Note: At this time, the sewage is pumped to the right. Therefore, the sewage level inside the filter assembly 102 is theoretically lower than the inner cavity height of the sealing chamber 2, and the impurities are discharged outward.

[0031] When the cleaning plate 13 comes into contact with the right limit of the top of the inner wall of the filter assembly 102, the rubber layer on the surface of the connecting plate 9 and the cleaning plate 13 comes into contact with the inner wall of the filter assembly 102. The cleaning plate 13 in position ① retracts and moves downward under the action of the spring 11, thereby successfully avoiding jamming and moving to position ②. At this time, the cleaning plate 13 in position ③ repeats the above operation.

[0032] Since the cleaning plate 13 maintains its tendency to press against the inner wall of the filter assembly 102 due to the centrifugal force generated by the drive shaft 105 and sleeve 6, under this condition, the spring 11 is stretched to the extreme. When the inlet 103 makes contact with the right limit of the top of the inner wall of the filter assembly 102, the rotation speed is reduced by a brief compression, so that the centrifugal force is small. At this time, the rebound force generated by the spring 11 can pull the guide column 12 and the cleaning plate 13 back to avoid jamming.

[0033] This invention utilizes a sleeve 6 that rotates with the drive shaft 105, causing three equally angled connecting plates 9 and cleaning plates 13 to rotate. The centrifugal force generated by the rotation of the connecting plates 9 causes the other end of the cleaning plate 13 to contact the inner wall of the filter assembly 102, moving the spring 11 and continuously stretching it to position ① by the outwardly moving guide post 12. At this point, the cleaning plate 13 scrapes the inner wall of the filter assembly 102, pushing impurities backward into the sealed chamber 2. Then, the cleaning plate 13 applies pressure to the linkage plate 17, causing the seal to open. When strip 18 disengages from sealing plate 15, elastic clamp 16 is compressed, discharging impurities along the gap between sealing plate 15 and sealing strip 18. Then, the momentary jamming caused by the right side of cleaning plate 13 contacting the inner wall of filter assembly 102 reduces the rotational speed of cleaning plate 13, eliminating centrifugal force. This causes spring 11, which is in a continuously stretched state, to pull cleaning plate 13 downward and move it smoothly to position ②, continuing to scrape impurities. This makes the cleaning of impurities more thorough and prevents impurities from entering the pump casing 1 and damaging the impeller.

[0034] Then, the filter plate 3 is driven to rotate at high speed by the drive shaft 105, so that small volume impurities suspended in the sewage are filtered by the filter plate 3 and retained on the right side of the filter plate 3. These impurities are separated by the centrifugal plate 5. When the filter plate 3 rotates, the sewage in the centrifugal plate 5 is driven by the centrifugal plate 5 and centrifugal force is generated, which drives the filtered small volume impurities to the edge of the inner wall of the filter assembly 102. Then, the continuously rotating and scraping cleaning plate 13 drives these small volume impurities into the sealed chamber 2. In particular, the small volume impurities driven to the top of the inner wall of the filter assembly 102 directly enter position ①, and are then directly scraped and driven into the sealed chamber 2 by the high-speed rotating cleaning plate 13, thus completing the filtration-type cleaning and improving the filtration efficiency.

[0035] Finally, by setting up a high-speed rotating filter plate 3, centrifugal plate 5 and guide column 12, the sewage entering the filter assembly 102 is centrifuged in advance. The sewage, which is given mechanical energy, continuously passes through the filter hole 4 and cleaning plate 13, increases its own kinetic energy and comes into contact with the impeller located inside the pump casing 1. The high-kinetic-energy sewage with centrifugal tendency can quickly fill the entire inner cavity of the pump casing 1, which doubles the speed at which the inner cavity of the pump casing 1 is filled with water, and avoids the "air blasting phenomenon" in the early stage of the device.

[0036] Among them, the outlet 101 is fixedly installed on the left side of the top of the pump casing 1, the output shaft of the motor 104 is connected to the transmission shaft 105 through a coupling, and the inlet 103 is fixedly installed on the right side of the top of the pump casing 1.

[0037] The motor 104 is connected to the drive shaft 105, which transmits its axial rotational power to the filter plate 3, the sleeve 6 and the impeller, thereby completing the efficient sewage transport and treatment operation.

[0038] The longitudinal section of the cleaning plate 13 is U-shaped, and a through hole 14 is provided on the surface of the cleaning plate 13. The top of the inner wall of the cleaning plate 13 is fixedly connected to the guide post 12.

[0039] The U-shaped cleaning plate 13 is fitted onto the surface of the connecting plate 9 via its inner wall. The opening of the through hole 14 reduces the resistance from water when the cleaning plate 13 rotates, while filtering some impurities in the water. The centrifugal force generated drives it to the edge, and finally, when it moves to the top of the inner wall of the filter assembly 102, it is also driven into the interior of the sealed chamber 2, completing the synchronous cleaning operation of impurities.

[0040] Among them, there are three placement slots 7, which are distributed at equal angles on the outer surface of the sleeve 6. The longitudinal cross-sectional shape of the placement slots 7 is "V" shaped, and the opening and closing angle of the placement slots 7 is 80°.

[0041] The placement groove 7 provides space for the connecting plate 9 to rotate. The bottom of the connecting plate 9 is squeezed against the inner wall of the placement groove 7 to generate a moving friction force, thereby maintaining the cleaning plate 13 to rotate to position ① due to a brief jam, and then the centrifugal force is eliminated by forcing the connecting plate 9 to stop. Then, with the cooperation of the spring 11, the cleaning plate 13 is pulled down to reset, so that the cleaning plate 13 can rotate smoothly to position ②.

[0042] Among them, there are three cleaning plates 13, which are distributed at equal angles on the outer surface of the sleeve 6. When the top of the guide post 12 is in a vertical state and contacts the top of the inner wall of the sealed chamber 2, the spring 11 connected to the guide post 12 is stretched and set inside the slot 10.

[0043] When the cleaning plate 13 rotates at high speed driven by the sleeve 6 and the connecting plate 9, it generates centrifugal force and moves towards the inner wall of the filter assembly 102. During rotation, it scrapes the inner wall of the filter assembly 102, carrying impurities into the sealed chamber 2, thus completing the cleaning work. The guide column 12 connects and guides the cleaning plate 13, ensuring that the cleaning plate 13 moves along the axial direction of the vertical drive shaft 105. The stretched spring 11 pulls the cleaning plate 13 back when it passes through position ①, preventing it from jamming.

[0044] The centrifugal plates 5 are fifteen in number and are fixedly connected at equal angles to the right side of the filter plate 3. The length of the centrifugal plates 5 is less than the radius of the filter plate 3, and the thickness of the centrifugal plates 5 gradually decreases from the outer edge of the filter plate 3 to the center.

[0045] The centrifugal plate 5, driven by the filter plate 3, moves the wastewater through it, generating centrifugal force. This helps to move impurities in the wastewater toward the outer edge of the filter plate 3, i.e., the inner wall of the filter assembly 102, improving the dispersion and collection of impurities after filtration. At the same time, it divides the impurities into fifteen equal parts, preventing them from being too concentrated and clogging the filter holes 4, thus affecting the filtration function of the filter plate 3. It also assists the cleaning plate 13 in properly distributing the impurities.

[0046] There are two sealing plates 15 connected sequentially to the upper and lower sides of the inner wall of the sealed chamber 2. The longitudinal cross-sectional shape of the sealing plate 15 is an isosceles triangle, and the longitudinal cross-sectional shape of the sealing strip 18 is a rhombus. The sealing strip 18 and the sealing plate 15 are sealed in contact by compression through the elastic clamping plate 16.

[0047] like Figure 4 As shown, when the cleaning plate 13 at position ① rotates clockwise and pushes the linkage plate 17, it will drive the sealing strip 18 to move backward, thereby exposing the gap with the sealing plate 15. Impurities can be discharged along the gap. At the same time, the fitting contact between the sealing plate 15 and the sealing strip 18, together with the elastic clamping plate 16, realizes the automatic sealing function of the sealing chamber 2. Each time the cleaning plate 13 disengages from the linkage plate 17, the elastic clamping plate 16 can always drive the sealing strip 18 to automatically contact the sealing plate 15 and form a sealing condition.

[0048] Among them, the horizontal cross-sectional shape of the elastic plate 16 is wavy, and the elastic plate 16 is made of stainless steel;

[0049] The flexible pallet 16, with its wave-shaped design, effectively avoids the drawback of traditional flexible spiral components that easily trap impurities. It can effectively save placement space when under pressure. The use of stainless steel material can effectively prevent water corrosion, resulting in a long service life and high reliability.

[0050] There are two linkage plates 17, which are fixedly connected to the left and right sides of the front of the sealing strip 18 respectively. The front end of the linkage plate 17 coincides with the cross-section of the filter assembly 102.

[0051] When the linkage plate 17 comes into contact with the cleaning plate 13, it is driven to move backward, and then can automatically push the sealing strip 18 backward and disengage from the sealing contact with the sealing plate 15. While compressing the elastic retaining plate 16, the gap between the sealing plate 15 and the sealing strip 18 is exposed, and impurities can be discharged intermittently along the gap. The two linkage plates 17 distributed on the left and right can make the sealing strip 18 more balanced in terms of force and avoid jamming.

[0052] Working principle:

[0053] When this device is working, the inlet 103 is connected to the sewage discharge pipe, so that the sewage fills the inside of the pump casing 1. The device is started, and the motor 104 drives the impeller to rotate through the transmission shaft 105. The centrifugal force generated by the high-speed rotation of the impeller drives the sewage to move continuously to the left and generates static pressure, so that the sewage is discharged along the outlet 101. During the operation, the transmission shaft 105 simultaneously drives the filter plate 3 and the sleeve 6 to rotate.

[0054] Larger impurities in the wastewater fall directly to the bottom of the inner wall of the filter assembly 102. Smaller impurities flow with the wastewater. When the wastewater passes through the filter plate 3, it flows directly to the left along the filter holes 4, while the impurities are filtered by the filter plate 3 and rotated by the centrifugal plate 5. The centrifugal force generated by the rotation carries the smaller impurities towards the outer edge of the filter plate 3. When passing the surface of the cleaning plate 13, the sleeve 6 drives the connecting plate 9 and the cleaning plate 13 to rotate. At this time, the guide column 12 is subjected to centrifugal force and begins to move towards the tension spring 11, so that the other end of the cleaning plate 13 is always in close contact with the inner wall of the filter assembly 102. Figure 4 As shown, when the guide column 12 moves to position ①, its right side will push the impurities to the right into the interior of the sealing chamber 2. Then, it will continue to rotate clockwise. With the cooperation of the left side of the inner wall of the placement groove 7, it will drive the linkage plate 17 and the sealing strip 18 to the right, so that the elastic plate 16 is compressed and a gap appears between the sealing strip 18 and the sealing plate 15. The impurities will be discharged along the gap. Note: At this time, the sewage is pumped to the right. Therefore, the sewage level inside the filter assembly 102 is theoretically lower than the inner cavity height of the sealing chamber 2, and the impurities are discharged outward.

[0055] When the cleaning plate 13 comes into contact with the right limit of the top of the inner wall of the filter assembly 102, the rubber layer on the surface of the connecting plate 9 and the cleaning plate 13 comes into contact with the inner wall of the filter assembly 102. The cleaning plate 13 in position ① retracts and moves downward under the action of the spring 11, thereby successfully avoiding jamming and moving to position ②. At this time, the cleaning plate 13 in position ③ repeats the above operation.

[0056] Since the cleaning plate 13 maintains its tendency to press against the inner wall of the filter assembly 102 due to the centrifugal force generated by the drive shaft 105 and sleeve 6, under this condition, the spring 11 is stretched to the extreme. When the inlet 103 makes contact with the right limit of the top of the inner wall of the filter assembly 102, the rotation speed is reduced by a brief compression, so that the centrifugal force is small. At this time, the rebound force generated by the spring 11 can pull the guide column 12 and the cleaning plate 13 back to avoid jamming.

Claims

1. A multi-stage centrifugal pump comprising a pump casing (1) further comprising a water outlet (101), a filter assembly (102), a water inlet (103), a motor (104) and a drive shaft (105), characterized in that: The drive shaft (105) extends into the interior of the filter assembly (102). A filter plate (3) and a sleeve (6) are fixedly connected to the outer surface of the drive shaft (105). A centrifugal plate (5) is fixedly connected to the right side of the filter plate (3). A filter hole (4) is provided on the right side of the filter plate (3). The filter hole (4) and the centrifugal plate (5) are staggered. A placement groove (7) is provided on the outer surface of the sleeve (6). A connecting plate (9) is rotatably installed on the inner wall of the placement groove (7) through a connecting column (8). A slot (10) is provided on the other side of the connecting plate (9). A spring (11) and a guide post (12) are movably connected inside the slot (10). A cleaning plate (13) is fixedly connected to the other end of the guide post (12). A sealing chamber (2) is fixedly connected to the back of the filter assembly (102). A sealing plate (15) is fixedly connected to the inner wall of the sealing chamber (2). A sealing strip (18) is sealed and snapped into the inside of the sealing chamber (2) by the sealing plate (15). A linkage plate (17) is fixedly connected to the front of the sealing strip (18). The back of the sealing strip (18) is elastically connected to the inner wall of the sealing chamber (2) by an elastic plate (16). The number of cleaning plates (13) is three and they are distributed at equal angles on the outer surface of the sleeve (6). When the top of the guide post (12) is in a vertical state and contacts the top of the inner wall of the sealed chamber (2), the spring (11) connected to the guide post (12) is stretched and set inside the slot (10). The number of sealing plates (15) is two and they are connected sequentially on the upper and lower sides of the inner wall of the sealing chamber (2). The longitudinal cross-sectional shape of the sealing plate (15) is an isosceles triangle, and the longitudinal cross-sectional shape of the sealing strip (18) is rhomboid. The sealing strip (18) and the sealing plate (15) are sealed in contact by compression through the elastic clamp (16). The number of linkage plates (17) is two and they are fixedly connected to the left and right sides of the front of the sealing strip (18). The front end of the linkage plate (17) coincides with the cross-section of the filter assembly (102). When the linkage plate (17) comes into contact with the cleaning plate (13), it is driven to move backward, and then can automatically push the sealing strip (18) backward and disengage from the sealing contact with the sealing plate (15). While compressing the elastic card plate (16), the gap between the sealing plate (15) and the sealing strip (18) is exposed, and impurities can be discharged intermittently along the gap. Each time the cleaning plate (13) disengages from the linkage plate (17), the elastic clamping plate (16) always drives the sealing strip (18) to automatically contact the sealing plate (15) and form a sealing condition.

2. A multi-stage centrifugal pump according to claim 1, characterized in that: The outlet (101) is fixedly installed on the left side of the top of the pump casing (1), the output shaft of the motor (104) is connected to the transmission shaft (105) through a coupling, and the inlet (103) is fixedly installed on the right side of the top of the pump casing (1).

3. A multi-stage centrifugal pump according to claim 1, characterized in that: The longitudinal section of the cleaning plate (13) is U-shaped. A through hole (14) is provided on the surface of the cleaning plate (13). The top of the inner wall of the cleaning plate (13) is fixedly connected to the guide post (12).

4. A multi-stage centrifugal pump according to claim 1, characterized in that: The number of placement grooves (7) is three and they are distributed at equal angles on the outer surface of the sleeve (6). The longitudinal cross-sectional shape of the placement grooves (7) is "V" shaped and the opening and closing angle of the placement grooves (7) is 80°.

5. A multi-stage centrifugal pump as claimed in claim 1, characterized in that: The number of centrifuge plates (5) is fifteen and they are fixedly connected at equal angles to the right side of the filter plate (3). The length of the centrifuge plate (5) is less than the radius of the filter plate (3), and the thickness of the centrifuge plate (5) gradually decreases from the outer edge of the filter plate (3) to the center.

6. A multi-stage centrifugal pump as claimed in claim 1, characterized in that: The horizontal cross-sectional shape of the elastic plate (16) is wavy, and the elastic plate (16) is made of stainless steel.

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