An exhaust separation mechanism for a self-priming multi-stage centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, and discloses an exhaust separation mechanism for a self-priming multi-stage centrifugal pump, comprising a fixed base, a transmission chamber, and a support frame. A pair of transmission pipes are installed on the side walls of the transmission chamber, a sealing cover is installed on the top of the transmission chamber, an exhaust and conveying mechanism is arranged on the top of the sealing cover, the exhaust and conveying mechanism comprises a fixed base, and a screening mechanism is installed inside the transmission chamber. Compared with the prior art, when the present invention is transported to the inside of the transmission chamber by water flow, a suspension ring floats on the water surface, and the operation of the exhaust chamber can quickly extract the excess gas inside the transmission chamber, and under the blocking effect of the suspension ring, the water flow introduced into the delivery pipe during the transmission process can be reduced. When the internal air is temporarily emptied, the delivery pipe can be clamped inside the gas delivery pipe under the action of the suspension ring, and the air inlet is blocked at this time, and the diversion hole at the top can be located inside the slide slot, so that the exhaust chamber can be continuously operated, and there is no need to continuously switch on and off with the help of an induction device during use.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to an exhaust separation mechanism for a self-priming multi-stage centrifugal pump. Background Art

[0002] A centrifugal pump, also known as a centrifugal water pump or a centrifugal pumping machine, is a mechanical device widely used in liquid transportation. The working principle of a centrifugal pump is based on the centrifugal movement of water to transport it to the work site.

[0003] The presence of bubbles in the water flow may have many effects on the transmission process. When bubbles are mixed in the water flow transmitted by the centrifugal pump, the presence of bubbles will increase the vibration and noise of the pump, affecting the stability and service life of the equipment, especially when they break. This not only affects the working environment, but may also accelerate the aging of the equipment. For this reason, we propose an exhaust separation mechanism for a self-priming multi-stage centrifugal pump to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an exhaust separation mechanism for a self-priming multi-stage centrifugal pump to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an exhaust separation mechanism for a self-priming multi-stage centrifugal pump, comprising a fixed base, a transmission chamber arranged on the top of the fixed base, and a support frame located at the top of the transmission chamber, a pair of transmission pipes are installed on the side wall of the transmission chamber, the transmission pipes are vertically staggered, a sealing cover is installed on the top of the transmission chamber, a vacuum conveying mechanism is provided on the top of the sealing cover, the vacuum conveying mechanism comprises a fixed base, the fixed base is clamped on the top of the sealing cover, a conveying pipe is inserted in the fixed base, a vacuum chamber is provided in the support frame, and the conveying pipe is connected with the vacuum chamber;

[0006] A screening mechanism is installed inside the transmission chamber, and the screening mechanism includes a separation baffle and a limiting ring frame. The limiting ring frame is clamped inside the transmission chamber, and the separation baffle is clamped on the limiting ring frame. The position of the separation baffle corresponds to the transmission pipe. When it is necessary to extract the air in the water flow during transmission, the water flow can be transported to the inside of the transmission chamber. Under the action of the vacuum chamber and the vacuum conveying mechanism, the air inside the transmission chamber can be quickly discharged, which can reduce the situation where air enters the centrifugal pump during the subsequent conveying process. In addition, during the transmission process, the screening mechanism can separate dirt and the like in the water flow to reduce the impact on the subsequent operation of the centrifugal pump.

[0007] Preferably, the air extraction and conveying mechanism further comprises a limiting ring and a movable plug rod, the limiting ring is clamped on the outer wall of the fixing seat, a pair of positioning plates are installed on the outer wall of the limiting ring, the positioning plates are symmetrically arranged, a movable slot is opened on the positioning plates, the movable plug rod is inserted in the movable slot, and the movable plug rod is elastic;

[0008] A fixed rod is installed on the inner wall of the top end of the movable plug rod, and hinged plates are movably provided at both ends of the fixed rod. A hinged rod is installed on one side of the hinged plate close to the conveying pipe, and the hinged rod is clamped on the surface of the conveying pipe. The movement of the conveying pipe can pull the hinged plate to move, thereby cooperating with the reset plug plate and the adsorption plate to collect suspended dirt in the water.

[0009] Preferably, a sealing slot is installed on the top of the sealing cover, and a reset plug plate is inserted inside the sealing slot, the top of the reset plug plate is abutted against the bottom of the movable plug rod, the movable plug rod can push the reset plug plate to move inside the sealing slot, and a rubber sleeve is provided on the surface of the reset plug rod, so that no accidental air leakage will occur during the movement of the reset plug plate.

[0010] Preferably, the delivery pipes are provided with air inlet holes and diversion holes, the bottoms of the delivery pipes at both ends are provided with suspension rings, the inner walls of the suspension rings are provided with a plurality of swing shafts, and the outer ends of the swing shafts are provided with adsorption plates, the adsorption plates are provided with a plurality of groups of annular grooves, and the annular grooves are arranged concentrically, a plurality of hook-shaped rods are provided on the surface of the adsorption plates, and the hook-shaped rods are evenly arranged in an array inside the annular grooves;

[0011] A plurality of groups of limit plugs are inserted on the outer wall of the suspension ring. The limit plugs are arranged in a uniform array on the outer wall of the suspension ring. The limit plugs are elastic. A pneumatic ring is installed on the limit plug. One side of the pneumatic ring is against the bottom of the reset plug plate. The pneumatic ring can be deformed under the action of external force, so that the reset plug and the top of the adsorption plate are squeezed to clamp the suspended dirt and the like inside the ring groove, thereby reducing the entry of dirt and debris into the centrifugal pump.

[0012] Preferably, an arc-shaped plate is installed on the side wall of the support frame, and a support plate is provided at the bottom of the arc-shaped plate, a fixed shaft is installed at the bottom of the support plate, and the fixed shaft is against the top of the fixed seat, the air pumping chamber is installed on the support plate, the air pumping chamber is located directly above the air pumping and conveying mechanism, a pair of air pipes are installed on the air inlet end at the bottom of the air pumping chamber, the position of the air pipes corresponds to the delivery pipe, the delivery pipe can be movably mounted inside the air pipe under the action of buoyancy, an exhaust pipe is installed on the top of the air pumping chamber, and when the air pumping chamber is in operation, the airflow can be discharged along the exhaust pipe under the action of negative pressure.

[0013] Preferably, a pair of slide grooves are provided on the surface of the gas transmission pipe, and the positions of the slide grooves correspond to the hinge shafts. The positions of the diverter holes on the surface of the transmission pipe correspond to the slide grooves. Both the diverter holes and the air inlet holes on the transmission pipe can be used for air intake transmission, and can be used to continuously operate the vacuum chamber in the case where exhaust is temporarily not required inside the transmission chamber without the need for additional sensors.

[0014] Preferably, the separation baffle is arc-shaped, sealing plates are installed at both ends of the separation baffle, elastic sieve plates are installed at both ends of the separation baffle, and the sieve holes of the elastic sieve plates are different, so that dirt in the water flow can be quickly separated.

[0015] Preferably, a rubber sheet is installed on a partial surface of the limiting ring frame located on the inner wall of the separation partition. The limiting ring frame is elastic and multiple groups of buffer frames are installed on the inner wall. A blocking plate is installed at one end of the buffer frame. The rubber sheet can assist in cleaning and reduce the accumulation of internal dirt.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the present invention is transported to the inside of the transmission chamber by water flow, the suspension ring floats on the water surface, and the operation of the air extraction chamber can quickly extract the excess gas inside the transmission chamber, and under the blocking effect of the suspension ring, the water flow introduced into the delivery pipe during the transmission process can be reduced. When the internal air is temporarily emptied, the delivery pipe can be clamped inside the air delivery pipe under the action of the suspension ring. At this time, the air inlet is blocked, and the diverter hole at the top can be located inside the chute, so that the air extraction chamber can continue to operate, and there is no need to use the induction device to continuously switch during use;

[0018] 2. The present invention can be impacted by the bubbles in the water flow when they burst and surge through the baffle plate, which can drive the buffer frame to move, change the direction of the internal water flow, quickly guide the bubbles in the water flow, and cooperate to discharge the internal air to reduce its entry into the centrifugal pump;

[0019] 3. When the conveying pipe moves under the action of buoyancy, the present invention can pull the hinged plate to move, so that the movable plug rod pushes the reset plug plate at the bottom to move, and can squeeze each other with the air pressure ring, so that the limit plug rod and the adsorption disk are compressed, and the dirt accumulated on the surface of the adsorption disk is squeezed and clamped inside the hook-shaped shaft, which is convenient for subsequent unified cleaning and maintenance;

[0020] 4. The present invention can separate debris and dirt in the water flow by separating the elastic sieve plates of different mesh sizes on the partition, reducing their entry into the centrifugal pump, and with the cooperation of the rubber sheet, it can also reduce the clogging of the elastic sieve plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the split structure of the transmission chamber of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the screening mechanism of the present invention;

[0024] Figure 4 For the present invention Figure 3 A partial enlarged schematic diagram in the middle;

[0025] Figure 5 This is a schematic diagram of the top structure of the sealing cover of the present invention;

[0026] Figure 6 For the present invention Figure 5 A partial enlarged schematic diagram of point B in the middle;

[0027] Figure 7 This is a schematic diagram of the suspension ring structure of the present invention;

[0028] In the figure: 1. fixed base; 2. transmission chamber; 3. vacuum conveying mechanism; 4. support frame; 5. screening mechanism; 21. transmission pipe; 22. sealing cover; 221. reset plug plate; 31. fixed seat; 311. limit ring; 32. positioning plate; 33. movable plug rod; 331. hinge plate; 34. conveying pipe; 341. air inlet; 342. diverter hole; 35. suspension ring; 36. adsorption plate; 37. limit plug rod; 371. air pressure ring; 41. vacuum chamber; 42. exhaust pipe; 43. fixed shaft; 44. support plate; 45. air pipe; 51. separation partition; 52. sealing plate; 53. limit ring frame; 54. buffer frame; 541. blocking plate. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 7The present invention provides a technical solution: an exhaust separation mechanism for a self-priming multi-stage centrifugal pump, comprising a fixed base 1, a transmission chamber 2 arranged on the top of the fixed base 1, and a support frame 4 located at the top of the transmission chamber 2. A pair of transmission pipes 21 are installed on the side wall of the transmission chamber 2, and the transmission pipes 21 are vertically staggered. A sealing cover 22 is installed on the top of the transmission chamber 2, and an air extraction and conveying mechanism 3 is provided on the top of the sealing cover 22. The air extraction and conveying mechanism 3 includes a fixed base 31, and the fixed base 31 is clamped on the top of the sealing cover 22. A conveying pipe 34 is inserted in the fixed base 31, and an air extraction chamber 41 is provided inside the support frame 4, and the conveying pipe 34 is connected with the air extraction chamber 41;

[0031] A screening mechanism 5 is installed inside the transmission chamber 2, and the screening mechanism 5 includes a separation baffle 51 and a limiting ring frame 53. The limiting ring frame 53 is clamped inside the transmission chamber 2, and the separation baffle 51 is clamped on the limiting ring frame 53. The position of the separation baffle 51 corresponds to the transmission pipe 21. When it is necessary to extract the air in the water flow during transmission, the water flow can be transported to the transmission chamber 2. Under the action of the vacuum chamber 41 and the vacuum conveying mechanism 3, the air inside the transmission chamber 2 can be quickly discharged, which can reduce the situation where air enters the centrifugal pump during the subsequent conveying process. In addition, during the transmission process, the screening mechanism 5 can separate dirt and the like in the water flow to reduce the impact on the subsequent operation of the centrifugal pump.

[0032] like Figure 6 As shown, in order to ensure stability during the air extraction process, the air extraction and delivery mechanism 3 further includes a limiting ring 311 and a movable plug rod 33. The limiting ring 311 is clamped on the outer wall of the fixing seat 31. A pair of positioning plates 32 are installed on the outer wall of the limiting ring 311. The positioning plates 32 are symmetrically arranged. The positioning plates 32 are provided with movable slots. The movable plug rod 33 is inserted inside the movable slot. The movable plug rod 33 is elastic. The bottom of the movable plug rod 33 can be against the top of the reset plug plate 221 during the activity, and the movable plug rod 33 can be deformed under the action of its own elasticity.

[0033] A fixed rod is installed on the inner wall of the top end of the movable rod 33, and hinge plates 331 are movably provided at both ends of the fixed rod. A hinge rod is installed on one side of the hinge plate 331 close to the conveying pipe 34, and the hinge rod is clamped on the surface of the conveying pipe 34. The hinge plate 331 can move with the conveying pipe 34, thereby pulling the movable rod 33 to move inside the movable card slot.

[0034] like Figure 6As shown, in order to reduce the accumulation of dirt and impurities in the water flow, a sealing slot is installed on the top of the sealing cover 22, and a reset plug plate 221 is inserted inside the sealing slot. The top of the reset plug plate 221 is against the bottom of the movable plug rod 33, and the movable plug rod 33 can push the reset plug plate 221 to move inside the sealing slot. A rubber sleeve is provided on the side wall of the reset plug plate 221. No air leakage will occur during the movement, which can ensure the exhaust efficiency of the equipment. As the reset plug plate 221 can squeeze the top of the air pressure ring 371, the limiting plug rod 37 and the adsorption plate 36 can be squeezed, and the dirt and debris accumulated on the surface can be compacted on the surface of the adsorption plate 36, which is convenient for subsequent unified cleaning.

[0035] like Figure 7 As shown, in order to reduce the dirt in the water flow entering the centrifugal pump during the transmission process, the delivery pipe 34 is provided with an air inlet 341 and a diversion hole 342, and a suspension ring 35 is installed at the bottom of the delivery pipe 34 at both ends. A plurality of swing shafts are installed on the inner wall of the suspension ring 35, and an adsorption disk 36 is installed at the outer end of the swing shaft. The adsorption disk 36 can move with the water flow under the action of the swing shaft to play the role of adsorbing dirt and debris. The adsorption disk 36 is provided with a plurality of groups of annular grooves, and the annular grooves are concentrically arranged. A plurality of hook-shaped rods are provided on the surface of the adsorption disk 36, and the hook-shaped rods are uniformly arranged in an array inside the annular grooves. The hook-shaped rods can adsorb suspended debris and dirt when the adsorption disk 36 moves in the water flow, and can accumulate them inside the annular grooves.

[0036] A plurality of groups of limit rods 37 are inserted on the outer wall of the suspension ring 35. The limit rods 37 are arranged in a uniform array on the outer wall of the suspension ring 35. The limit rods 37 are elastic. A pneumatic ring 371 is installed on the limit rods 37. One side of the pneumatic ring 371 is against the bottom of the reset plug plate 221. The pneumatic ring 371 can interact with the reset plug plate 221, so that the limit rods 37 can be squeezed and rubbed in the ring groove to trap the dirt inside the ring groove.

[0037] like Figure 5 As shown, in order to reduce the impact of bubbles in the water flow on the normal operation of the centrifugal pump, an arc-shaped plate is installed on the side wall of the support frame 4, and a support plate 44 is provided at the bottom of the arc-shaped plate. A fixed shaft 43 is installed at the bottom of the support plate 44, and the fixed shaft 43 is against the top of the fixed seat 31. The air pumping chamber 41 is installed on the support plate 44. The air pumping chamber 41 is located directly above the air pumping and conveying mechanism 3. A pair of air delivery pipes 45 are installed on the air inlet end at the bottom of the air pumping chamber 41. The position of the air delivery pipe 45 corresponds to the delivery pipe 34. The delivery pipe 34 can be movably mounted inside the air delivery pipe 45 under the action of buoyancy. An exhaust pipe 42 is installed at the top of the air pumping chamber 41. When the water flow is transported to the inside of the transmission chamber 2, a cavity can appear inside. The suspension ring 35 can float on the water surface under the action of buoyancy. At this time, the operation of the air pumping chamber 41 can quickly extract the excess gas inside the transmission chamber 2.

[0038] like Figure 7 As shown, in order to ensure the stability of air extraction and reduce the accidental damage of the equipment, a pair of slide grooves are opened on the surface of the air delivery pipe 45, and the position of the slide grooves corresponds to the hinge axis, and the position of the diverter hole 342 on the surface of the delivery pipe 34 corresponds to the slide grooves. When the air extraction chamber 41 is in operation, the excess gas inside the transmission chamber 2 can be quickly extracted, and under the blocking effect of the suspension ring 35, the water flow introduced into the delivery pipe 34 during the transmission process can be reduced. When the internal air is temporarily emptied, the delivery pipe 34 can be clamped in the air delivery pipe 45 under the action of the suspension ring 35. At this time, the air inlet 341 is blocked, and the diverter hole 342 at the top can be located inside the slide groove, so that the air extraction chamber 41 can continue to operate, and there is no need to use the sensing device to continuously switch during use. Compared with the situation in which the sensor is not sensitive during use of traditional equipment and the air flow is still mixed into the centrifugal pump, it can save costs.

[0039] like Figure 3 As shown, in order to reduce the mixing of dirt into the transmission chamber 2, the separation baffle 51 is arc-shaped, and sealing plates 52 are installed at both ends of the separation baffle 51. Elastic sieve plates are installed at both ends of the separation baffle 51, and the mesh numbers of the elastic sieve plates are different. With the help of the elastic sieve plates with different mesh numbers on the separation baffle 51, debris and dirt in the water flow can be separated to reduce their entry into the centrifugal pump.

[0040] like Figure 4 As shown, a rubber sheet is installed on a partial surface of the limit ring frame 53 located on the inner wall of the separation partition 51. The limit ring frame 53 is elastic and a plurality of buffer frames 54 are installed on the inner wall. A blocking plate 541 is installed at one end of the buffer frame 54. During the water flow transmission process, the blocking plate 541 can be impacted when the bubbles inside the water flow burst and surge, which can drive the buffer frame 54 to move, change the direction of the internal water flow, quickly guide the bubbles in the water flow, and cooperate to discharge the internal air to reduce its entry into the centrifugal pump.

[0041] Working principle: First, when it is necessary to extract the air in the water flow during transmission, the water flow can be transported to the inside of the transmission chamber 2, and the air in the transmission chamber 2 can be quickly discharged under the action of the air extraction chamber 41 and the air extraction and transmission mechanism 3, which can reduce the situation where air enters the centrifugal pump during the subsequent transmission process. In the transmission process, the screening mechanism 5 can separate the dirt in the water flow, reduce the impact on the subsequent operation of the centrifugal pump, and when the water flow is transported to the inside of the transmission chamber 2, a cavity can appear inside, and the suspension ring 35 can float in the floating chamber 2. Under the action of force, it floats on the water surface. At this time, with the operation of the air extraction chamber 41, the excess gas inside the transmission chamber 2 can be quickly extracted, and under the blocking effect of the suspension ring 35, the water flow introduced into the delivery pipe 34 during the transmission process can be reduced. When the air inside is temporarily emptied, the delivery pipe 34 can be clamped inside the gas delivery pipe 45 under the action of the suspension ring 35. At this time, the air inlet 341 is blocked, and the diverter hole 342 at the top can be located inside the chute, so that the air extraction chamber 41 can continue to operate, and there is no need to use the induction device to continuously switch during use;

[0042] Then, when the delivery pipe 34 moves under the action of buoyancy, the hinge plate 331 can be pulled to move, so that the movable plug rod 33 pushes the reset plug plate 221 at the bottom to move, and can squeeze each other with the air pressure ring 371, so that the limit plug rod 37 and the adsorption disk 36 are compressed, and the dirt and the like accumulated on the surface of the adsorption disk 36 are squeezed and stuck inside the hook-shaped shaft, which is convenient for subsequent unified cleaning and maintenance;

[0043] Finally, during the water flow transmission process, the blocking plate 541 can be impacted when the bubbles inside the water flow burst and surge, which can drive the buffer frame 54 to move, change the direction of the internal water flow, quickly discharge the bubbles in the water flow, and cooperate to discharge the internal air to reduce its entry into the centrifugal pump. With the help of the elastic sieve plates with different mesh sizes on the separation partition 51, debris and dirt in the water flow can be separated to reduce its entry into the centrifugal pump. With the cooperation of the rubber sheet, the blockage of the elastic sieve plate can also be reduced.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust separation mechanism for a self-priming multi-stage centrifugal pump, comprising a fixed base (1), a transmission chamber (2) arranged on the top of the fixed base (1), and a support frame (4) located at the top of the transmission chamber (2), characterized in that: A pair of transmission tubes (21) are installed on the side wall of the transmission chamber (2), and the transmission tubes (21) are arranged in a vertical staggered manner. A sealing cover (22) is installed on the top of the transmission chamber (2), and a vacuum conveying mechanism (3) is provided on the top of the sealing cover (22). The vacuum conveying mechanism (3) comprises a fixed seat (31), and the fixed seat (31) is clamped on the top of the sealing cover (22). A conveying tube (34) is inserted into the fixed seat (31). An air pumping chamber (41) is provided inside the support frame (4), and the conveying tube (34) is connected to the air pumping chamber (41). A screening mechanism (5) is installed inside the transmission chamber (2), the screening mechanism (5) comprising a separation baffle (51) and a limiting ring frame (53), the limiting ring frame (53) being mounted inside the transmission chamber (2), the separation baffle (51) being mounted on the limiting ring frame (53), and the position of the separation baffle (51) corresponding to the transmission pipe (21); The air extraction and conveying mechanism (3) further comprises a limit ring (311) and a movable insertion rod (33), wherein the limit ring (311) is clamped on the outer wall of the fixing seat (31), and a pair of positioning plates (32) are mounted on the outer wall of the limit ring (311), wherein the positioning plates (32) are symmetrically arranged, and movable clamping grooves are formed on the positioning plates (32), wherein the movable insertion rod (33) is inserted into the movable clamping groove, and wherein the movable insertion rod (33) is elastic; A fixing rod is installed on the inner wall of the top end of the movable plug rod (33), and hinge plates (331) are movably clamped at both ends of the fixing rod, and hinge rods are installed on the side of the hinge plates (331) close to the conveying pipe (34), and the hinge rods are clamped on the surface of the conveying pipe (34); The delivery pipe (34) is provided with an air inlet hole (341) and a flow diversion hole (342), and suspension rings (35) are installed at the bottom of the delivery pipe (34) at both ends. A plurality of swing shafts are installed on the inner wall of the suspension ring (35), and an adsorption plate (36) is installed at the outer end of the swing shaft. The adsorption plate (36) is provided with a plurality of groups of annular grooves, and the annular grooves are arranged concentrically. A plurality of hook-shaped rods are provided on the surface of the adsorption plate (36), and the hook-shaped rods are evenly arranged in an array inside the annular grooves. A plurality of groups of limiting insertion rods (37) are inserted on the outer wall of the suspension ring (35), and the limiting insertion rods (37) are arranged in a uniform array on the outer wall of the suspension ring (35).

2. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 1, characterized in that: A sealing slot is installed on the top of the sealing cover (22), and a reset plug plate (221) is inserted inside the sealing slot. The top of the reset plug plate (221) abuts against the bottom of the movable plug rod (33), and the movable plug rod (33) can push the reset plug plate (221) to move inside the sealing slot.

3. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 2, characterized in that: The limiting plug rod (37) is elastic, and a pneumatic ring (371) is mounted on the limiting plug rod (37), with one side of the pneumatic ring (371) abutting against the bottom of the reset plug plate (221).

4. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 1, characterized in that: An arc-shaped plate is mounted on the side wall of the support frame (4), and a support plate (44) is mounted on the bottom of the arc-shaped plate. A fixed shaft (43) is mounted on the bottom of the support plate (44), and the fixed shaft (43) is against the top of the fixed seat (31). The air pumping chamber (41) is mounted on the support plate (44). The air pumping chamber (41) is located directly above the air pumping and conveying mechanism (3). A pair of air delivery pipes (45) are mounted on the air inlet end at the bottom of the air pumping chamber (41). The positions of the air delivery pipes (45) correspond to those of the conveying pipes (34). The conveying pipes (34) can be movably mounted inside the air delivery pipes (45) under the action of buoyancy. An exhaust pipe (42) is mounted on the top of the air pumping chamber (41).

5. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 4, characterized in that: A pair of slide grooves are provided on the surface of the gas delivery pipe (45), and the positions of the slide grooves correspond to the hinge axis. The positions of the diverter holes (342) on the surface of the delivery pipe (34) correspond to the slide grooves.

6. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 1, characterized in that: The separation baffle (51) is arc-shaped, and sealing plates (52) are installed at both ends of the separation baffle (51). Elastic sieve plates are installed at both ends of the separation baffle (51), and the sieve mesh numbers of the elastic sieve plates are different.

7. The exhaust separation mechanism for a self-priming multi-stage centrifugal pump according to claim 6, characterized in that: A rubber sheet is installed on a portion of the surface of the limiting ring frame (53) located on the inner wall of the separation partition (51); the limiting ring frame (53) is elastic and has a plurality of groups of buffer frames (54) installed on the inner wall; and a blocking plate (541) is installed at one end of each buffer frame (54).

Images