Submersible sewage pump

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to a submersible sewage pump which comprises a pump body, a first impeller and a second impeller, a first cavity, a second cavity and a communicating channel are formed in the pump body, and the two ends of the communicating channel communicate with the first cavity and the second cavity correspondingly. The outer surface of the pump body is provided with a water inlet communicated with the first cavity and a water outlet communicated with the second cavity, the first impeller is arranged in the first cavity and corresponds to the water inlet and the communication channel, the second impeller is arranged in the second cavity and corresponds to the water outlet, and the water inlet is communicated with the water outlet. And the second impeller is arranged corresponding to the communicating channel and the water outlet. In conclusion, according to the submersible sewage pump, sewage is guided through the circulation channel communicating with the first cavity and the second cavity in the body, guide vanes are not arranged for guiding, so that the risk that the interior of the submersible sewage pump is blocked is reduced, and the situation that the submersible sewage pump is unsmooth in operation and even cannot be used due to the risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and in particular to a submersible sewage pump. Background Technology

[0002] A submersible sewage pump is a centrifugal pump that operates submerged in liquid to transport wastewater containing impurities such as solid particles (e.g., silt, gravel) and fibers (e.g., hair, fabric). To increase the conveying height, extend the horizontal conveying distance, and overcome the resistance of impurities, submersible sewage pumps require a high head.

[0003] Currently, there is a type of submersible sewage pump on the market with a guide vane double impeller structure that can effectively increase the head. Its two impellers are located within the pump body, and they sequentially pressurize the sewage to increase the output head. Guide vanes are placed between the two impellers to guide the flow. However, because the guide vanes have a large bending angle, complex shape, and are fixed within the pump body, impurities in the sewage easily accumulate and become entangled on the guide vanes during pump operation, causing blockages within the pump body. This leads to poor operation or even complete malfunction of the submersible sewage pump. Summary of the Invention

[0004] The purpose of this invention is to provide a submersible sewage pump to solve the technical problem that submersible sewage pumps with a guide vane double impeller structure are prone to clogging, resulting in poor operation or even inability to use the pump.

[0005] To achieve the above objectives, the present invention provides a submersible pump, comprising a pump body, a first impeller, and a second impeller. The pump body is provided with a first chamber, a second chamber, and a connecting channel. The two ends of the connecting channel are respectively connected to the first chamber and the second chamber. The outer surface of the pump body is provided with an inlet connected to the first chamber and an outlet connected to the second chamber. The first impeller is disposed in the first chamber, corresponding to the inlet and the connecting channel. The second impeller is disposed in the second chamber, corresponding to the connecting channel and the outlet.

[0006] Optionally, the water inlet is located on the bottom surface of the pump body, the water outlet is located on the side of the pump body facing the horizontal direction, the first chamber is spaced below the second chamber, and the two ends of the connecting channel are respectively connected to one side of the first chamber along the horizontal direction and the top of the second chamber.

[0007] Optionally, the connecting channel includes a first connecting segment, a second connecting segment, and a third connecting segment connected in sequence. The first connecting segment is connected to the first chamber, and the third connecting segment is connected to the second chamber. There is a first channel angle α between the first connecting segment and the second connecting segment, and a second channel angle b between the second connecting segment and the third connecting segment. The first channel angle α is less than 135°, and the second channel angle b is less than 135°.

[0008] Optionally, a first transition section is provided at the junction of the first connecting segment and the second connecting segment, and a second transition section is provided at the junction of the second connecting segment and the third connecting segment.

[0009] Optionally, the first transition segment and the second transition segment include arc segments, wherein the maximum radius of the arc segment of the first transition segment and the maximum radius of the arc segment of the second transition segment are both 1.05 to 1.15 times the radius of the connecting channel.

[0010] Optionally, a first communication port is provided between the first chamber and the communication channel, and a second communication port is provided between the communication channel and the second chamber; The first impeller includes a first wheel body and a plurality of first blades. The plurality of first blades are disposed on the outer side wall of the first wheel body. A first inlet is provided on one side end face of the first wheel body. A plurality of first outlets are provided on the outer side wall of the first wheel body. The first inlet is connected to each of the first outlets. The first inlet faces the first connecting port. Rotation of the first impeller can cause the first outlet to face the first connecting port. The second impeller includes a second wheel body and a plurality of second blades. The plurality of second blades are disposed on the outer side wall of the second wheel body. A second inlet is provided on one side end face of the second wheel body. A plurality of second outlets are provided on the outer side wall of the first wheel body. The second inlet is connected to each of the second outlets. The second inlet faces the second connecting port. The rotation of the second impeller can cause the second outlet to face the water outlet.

[0011] Optionally, the pump body also includes a rotary driver and a rotating shaft. The pump body is also provided with a connecting hole, which extends from the first chamber to the second chamber. The rotating shaft passes through the first impeller, the second impeller, and the connecting hole, and is connected to the first impeller and the second impeller. The rotary driver is connected to the rotating shaft and is used to drive the rotating shaft to rotate, thereby causing the first impeller and the second impeller to rotate.

[0012] Optionally, a throttling sleeve is also included. A first connecting portion is provided on one end face of the first impeller, and a second connecting portion is provided on one end face of the second impeller. The first connecting portion and the second connecting portion are located inside the communicating hole and are fixedly sleeved on the outside of the rotating shaft. The throttling sleeve is provided inside the communicating hole and fixedly sleeved on the outside of the first connecting portion and the second connecting portion. There is a gap between the outer wall of the throttling sleeve and the hole wall of the communicating hole. The throttling sleeve is used to guide the medium in the first chamber to the second chamber.

[0013] Optionally, the outer wall of the throttling sleeve is provided with a plurality of throttling grooves spaced apart along its axial direction. The throttling grooves are arranged around the axis of the throttling sleeve, and the throttling groove closest to the first chamber extends through to the end face of the throttling sleeve facing the first chamber.

[0014] Optionally, the throttling groove is provided with multiple partitions, which are connected to the groove wall and bottom of the throttling groove and extend radially to the outer side wall of the throttling sleeve. The multiple partitions divide the throttling groove into multiple sub-grooves.

[0015] Compared with the prior art, the submersible sewage pump implemented in this invention has the following advantages: In the submersible sewage pump of the present invention, a first impeller is disposed in a first chamber and is configured corresponding to the inlet and the connecting channel. Sewage entering the first chamber from the inlet flows into the first impeller, whereby the first impeller throws the sewage outward and pushes it aside with its blades, thus applying initial pressurization and conveying the sewage towards the connecting channel. The sewage then continues to flow along the connecting channel. Furthermore, a second impeller is disposed in a second chamber and is configured corresponding to the outlet and the connecting channel. Sewage entering the second chamber from the flow channel flows into the second impeller, whereby the second impeller throws the sewage outward and pushes it aside with its blades, thus applying a second pressurization and conveying the sewage towards the outlet. In summary, the submersible sewage pump of the present invention guides sewage through a flow channel connecting the first and second chambers within the pump body, without the use of guide vanes, thereby reducing the risk of blockage within the pump and minimizing situations where the pump malfunctions or becomes unusable. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the submersible sewage pump of the present invention.

[0017] Figure 2 for Figure 1 A magnified view of part A in the middle.

[0018] Figure 3 This is a cross-sectional view of the submersible sewage pump of the present invention with a throttling sleeve.

[0019] Figure 4 for Figure 3 A magnified view of part B in the middle.

[0020] Figure 5 This is a bottom view of the throttling sleeve of the present invention.

[0021] Reference numerals: 1. First impeller; 11. First impeller body; 111. First inlet; 112. First outlet; 12. First blade; 13. First connecting part; 2. Second impeller; 21. Second impeller body; 211. Second inlet; 212. Second outlet; 22. Second blade; 23. Second connecting part; 3. Pump body; 31. First chamber; 32. Second chamber; 33. Connecting channel; 331. First connecting section; 332. Second connecting section; 333. Third connecting section; 334. First transition section; 335. Second transition section; 336. First connecting port; 337. Second connecting port; 34. Water inlet; 35. Water outlet; 34. Connecting hole; 4. Rotary driver; 5. Rotating shaft; 6. Throttling sleeve; 61. Throttling groove; 611. Dividing groove; 62. Separating part. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be understood that the terms "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] like Figures 1 to 5As shown, a submersible sewage pump of the present invention includes a pump body 3, a first impeller 1, and a second impeller 2. The pump body 3 is provided with a first chamber 31, a second chamber 32, and a connecting channel 33. The two ends of the connecting channel 33 are respectively connected to the first chamber 31 and the second chamber 32. The outer surface of the pump body 3 is provided with an inlet 34 connected to the first chamber 31 and an outlet 35 connected to the second chamber 32. The first impeller 1 is disposed in the first chamber 31 and is arranged corresponding to the inlet 34 and the connecting channel 33. The second impeller 2 is disposed in the second chamber 32 and is arranged corresponding to the connecting channel 33 and the outlet 35.

[0026] In the above technical solution, the first impeller 1 is disposed in the first chamber 31 and is positioned corresponding to the inlet 34 and the connecting channel 33. This allows wastewater entering the first chamber 31 through the inlet 34 and flowing into the first impeller 1. The first impeller 1 then throws the wastewater outwards and pushes it away with its blades, thus initially pressurizing the wastewater and conveying it towards the connecting channel 33. The wastewater then continues to flow along the connecting channel 33. Furthermore, the second impeller 2 is disposed in the second chamber 32 and is positioned corresponding to the outlet 35 and the connecting channel 33. The design allows sewage to enter the second chamber 32 through the flow channel and flow into the second impeller 2. The second impeller 2 then throws the sewage outward and pushes it away with its blades to apply a second pressurization to the sewage and deliver it to the outlet 35. In summary, the submersible sewage pump of the present invention guides sewage through the flow channel connecting the first chamber 31 and the second chamber 32 within the main body, without the use of guide vanes. This reduces the risk of blockage within the submersible sewage pump and minimizes the possibility of malfunction or even unusability of the pump.

[0027] Furthermore, the inlet 34 is located on the bottom surface of the pump body 3, the outlet 35 is located on the side of the pump body 3 facing the horizontal direction, the first chamber 31 is spaced below the second chamber 32, and the two ends of the connecting channel 33 are respectively connected to one side of the first chamber 31 along the horizontal direction and the top of the second chamber 32.

[0028] The design allows the submersible pump to draw sewage from bottom to top into the first chamber 31, then sequentially transport the sewage horizontally, upward, and horizontally again into the upper part of the second chamber 32 via the connecting channel 33, then transport the sewage downward into the second chamber 32, and finally discharge the sewage horizontally outward. This facilitates the extraction of sewage deposited at the bottom of the pool through the inlet 34, and the outlet 35 can connect to the horizontally laid external pipes, reducing resistance loss caused by the external pipes.

[0029] Furthermore, the connecting channel 33 includes a first connecting segment 331, a second connecting segment 332, and a third connecting segment 333 connected in sequence. The first connecting segment 331 is connected to the first chamber 31, and the third connecting segment 333 is connected to the second chamber 32. There is a first channel angle α between the first connecting segment 331 and the second connecting segment 332, and a second channel angle b between the second connecting segment 332 and the third connecting segment 333. The first channel angle α is less than 135°, and the second channel angle b is less than 135°.

[0030] In the three-section structure of the connecting channel 33, the angle between each section is less than 135° to avoid excessively large angles between sections, so that the sewage can turn more smoothly in the flow channel, avoiding a sudden drop in flow velocity caused by large-angle turns and reducing the number of impurity deposition points; furthermore, the effect of the angle a of the first channel not being greater than 90° and the angle b of the second channel not being greater than 90° is even better.

[0031] Furthermore, a first transition section 334 is provided at the junction of the first connecting segment 331 and the second connecting segment 332, and a second transition section 335 is provided at the junction of the second connecting segment 332 and the third connecting segment 333.

[0032] Specifically, the first transition section 334 and the second transition section 335 can transform the junction between the first connecting section 331 and the second connecting section 332, as well as the junction between the second connecting section 332 and the third connecting section 333, from a hard corner into a smooth transition zone, allowing sewage to completely cover the flow channel cross section and flow, avoiding the deposition and entanglement of impurities at the corner; furthermore, the first transition section 334 and the second transition section 335 can be chamfered sections, or arc sections, or include multiple chamfered sections, or include multiple arc sections, or include a combination of arc sections and chamfered sections.

[0033] Furthermore, both the first transition segment 334 and the second transition segment 335 include arc segments, and the maximum radius of the arc segment of the first transition segment 334 and the maximum radius of the arc segment of the second transition segment 335 are 1.05 to 1.15 times the radius of the connecting channel 33.

[0034] Among them, the circular arc transition is more in line with fluid mechanics than the straight line transition, which can further reduce water flow resistance and prevent impurities from being deposited or entangled due to sudden changes in local flow velocity. At the same time, this radius range can balance the smoothness of water flow and the volume of the submersible sewage pump. Specifically, if the radius of the circular arc section of the transition section is too large, it will greatly increase the volume of the submersible sewage pump; if the radius of the circular arc section of the transition section is too small, the transition effect will be very limited.

[0035] Furthermore, a first connecting port 336 is provided between the first chamber 31 and the connecting channel 33, and a second connecting port 337 is provided between the connecting channel 33 and the second chamber 32; the first impeller 1 includes a first wheel body 11 and a plurality of first blades 12, the plurality of first blades 12 are disposed on the outer side wall of the first wheel body 11, a first inlet 111 is provided on one side end face of the first wheel body 11, and a plurality of first outlets 112 are provided on the outer side wall of the first wheel body 11, the first inlet 111 is connected to each of the first outlets 112, and the first inlet 111 faces the first connecting port 336. The first impeller 1 rotates such that the first outlet 112 faces the first connecting port 336; the second impeller 2 includes a second wheel body 21 and a plurality of second blades 22, the plurality of second blades 22 are disposed on the outer side wall of the second wheel body 21, a second inlet 211 is provided on one side end face of the second wheel body 21, a plurality of second outlets 212 are provided on the outer side wall of the first wheel body 11, the second inlet 211 is connected to each of the second outlets 212, the second inlet 211 faces the second connecting port 337, and the second impeller 2 rotates such that the second outlet 212 faces the water outlet 35.

[0036] In this process, after entering the first chamber 31 through the inlet 34, the wastewater enters the first wheel body 11. Then, the wastewater flows through the first inlet 111 and the first outlet 112 towards the first connecting port 336 and is pushed outward by the first blade 12, achieving a first pressurization. After entering the second chamber 32 through the connecting channel 33, the wastewater enters the second wheel body 21. Then, the wastewater flows through the second inlet 211 and the second outlet 212 towards the outlet 35 and is pushed outward by the second blade 22, achieving a second pressurization. Furthermore, the first wheel body 11 is rotatably connected to the inlet... The first inlet 111 is fully connected to the inlet 34 to ensure that all sewage entering from the inlet 34 can directly enter the center of the first impeller 1, avoiding sewage retention or backflow outside the first impeller 1 and maximizing the centrifugal pressurization effect of the first impeller 1. Furthermore, the second impeller 21 can be rotatably connected to the second connecting port 337, so that the second inlet 211 is fully connected to the second connecting port 337, ensuring that all sewage entering from the connecting channel 33 can directly enter the center of the second impeller 2, avoiding sewage retention or backflow outside the second impeller 2 and maximizing the centrifugal pressurization effect of the second impeller 2.

[0037] Furthermore, it also includes a rotary driver 4 and a rotating shaft 5. The pump body 3 is also provided with a connecting hole 36, which extends from the first chamber 31 to the second chamber 32. The rotating shaft 5 passes through the first impeller 1, the second impeller 2, and the connecting hole 36, and is connected to the first impeller 1 and the second impeller 2. The rotary driver 4 is connected to the rotating shaft 5 and is used to drive the rotating shaft 5 to rotate, thereby causing the first impeller 1 and the second impeller 2 to rotate.

[0038] One rotating shaft 5 drives two impellers simultaneously to ensure that the first impeller 1 and the second impeller 2 rotate at the same speed, avoiding the possibility that one impeller rotates too fast and causes cavitation, which would cause sewage to accumulate in the connecting channel 33, and ensuring the synergy of the two-stage pressurization to stabilize the output head; in addition, the rotating drive 4 can be a rotating motor.

[0039] Furthermore, since the first chamber 31 and the second chamber 32 are directly connected, and the water pressure in the first chamber 31 is lower than that in the second chamber 32, sewage in the second chamber 32 will leak from the gap between the rotating shaft 5 and the connecting hole 36 into the first chamber 31. This results in a reduction in the effective pressurization of the first impeller 1 and a reduction in the efficiency of the submersible pump, ultimately causing the final output head to fail to reach the design value. To solve this technical problem, the submersible pump also includes a throttling sleeve 6, and a first connecting part 13 is provided on one end face of the first impeller 1. The second impeller 2 has a second connecting part 23 on one end face. The first connecting part 13 and the second connecting part 23 are located in the communicating hole 36 and are fixedly sleeved on the outside of the rotating shaft 5. The throttling sleeve 6 is located in the communicating hole 36 and is fixedly sleeved on the outside of the first connecting part 13 and the second connecting part 23. There is a gap between the outer wall of the throttling sleeve 6 and the hole wall of the communicating hole 36. The throttling sleeve 6 is used to guide the medium in the first chamber 31 to the second chamber 32.

[0040] When the first impeller 1 pushes the liquid in the first chamber 31 toward the connecting channel 3, the liquid entering the first chamber 31 from the inlet 34 will flow toward the throttling sleeve 6, and then flow toward the gap between the outer wall of the throttling sleeve 6 and the wall of the connecting hole 34, forming a positive flow from the chamber with lower pressure to the chamber with higher pressure. This positive flow and the backflow from the second chamber 32 to the first chamber 31 form a counterflow to offset the backflow trend, thereby reducing the leakage of the second chamber 32 and ensuring the efficiency of the submersible pump.

[0041] In addition, there are no gaps or only very small gaps between the first connecting part 13 and the rotating shaft 5, between the second connecting part 23 and the rotating shaft 5, between the throttling sleeve 6 and the first connecting part 13, and between the throttling sleeve 6 and the second connecting part 23. Sealing rings can also be provided to seal the gaps and prevent sewage from flowing between the aforementioned components.

[0042] Furthermore, the outer wall of the throttling sleeve 6 is provided with a plurality of throttling grooves 61 spaced along its axial direction. The throttling grooves 61 are arranged around the axis of the throttling sleeve 6. The throttling groove 61 closest to the first chamber 31 extends to the end face of the throttling sleeve 6 facing the first chamber 31, so that the sewage in the first chamber 31 can enter the gap between the outer wall of the throttling sleeve 6 and the wall of the connecting hole 36 through the throttling groove 61 closest to the first chamber 31, and then enter other throttling grooves 61 to form a positive flow from the first chamber 31 to the second chamber 32. Moreover, the throttling grooves 61 can also generate resistance to backflow, further reducing leakage.

[0043] Furthermore, the throttling groove 61 is provided with a plurality of partitions 62, which are connected to the groove wall and the bottom of the throttling groove 61 and extend radially to the outer side wall of the throttling sleeve 6. The plurality of partitions 62 divide the throttling groove 61 into a plurality of sub-grooves 611.

[0044] The partition 62 connects the wall and bottom of the throttling groove 61, which can prevent the throttling sleeve 6 from deforming due to the excessive width of the throttling groove 61 and extend the service life of the throttling sleeve 6. Furthermore, the multi-component groove 611 can make the forward flow evenly distributed in the gap, ensuring that the forward pressure in each area is consistent, continuously and stably offsetting the backflow pressure, and can also convert a single wide water flow into multiple narrow water flows, making the water flow distribution in the throttling sleeve 6 and its outer side more uniform, avoiding the instability of the forward flow caused by local water flow being too fast or too slow.

[0045] Furthermore, fixed setting and fixed connection refer to the fixed relative positional relationship of two components, including but not limited to fixing by connectors, fixing by welding, fixing by adhesive, fixing by integral molding, and fixing by snap-fit ​​connection.

[0046] Furthermore, rotatable connection and rotatable setting refer to the ability of two connected components to rotate, including but not limited to connections via bearings or clearance fits.

[0047] Furthermore, the connectors include, but are not limited to, fasteners, straps, ropes, pneumatic connectors, hydraulic connectors, flanges, Velcro, and buttons.

[0048] In summary, the embodiments of the present invention provide a submersible sewage pump, the technical effects of which are as follows: In the submersible sewage pump of the present invention, a first impeller 1 is disposed in a first chamber 31 and is configured corresponding to the inlet 34 and the connecting channel 33, such that after sewage enters the first chamber 31 through the inlet 34 and flows into the first impeller 1, the first impeller 1 throws the sewage outward and pushes the sewage away through its blades to apply initial pressure to the sewage and transport it towards the connecting channel 33. Then, the sewage continues to flow along the connecting channel 33. Furthermore, a second impeller 2 is disposed in a second chamber 32 and is configured corresponding to the outlet 35 and the connecting channel 33. The design allows sewage to enter the second chamber 32 through the flow channel and flow into the second impeller 2. The second impeller 2 then throws the sewage outward and pushes it away with its blades to apply a second pressurization to the sewage and deliver it to the outlet 35. In summary, the submersible sewage pump of the present invention guides sewage through the flow channel connecting the first chamber 31 and the second chamber 32 within the main body, without the use of guide vanes. This reduces the risk of blockage within the submersible sewage pump and minimizes the possibility of malfunction or even unusability of the pump.

[0049] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A submersible sewage pump characterized in that, The pump comprises a pump body (3), a first impeller (1) and a second impeller (2), the pump body (3) is internally provided with a first chamber (31), a second chamber (32) and a communication passage (33), the two ends of the communication passage (33) are communicated with the first chamber (31) and the second chamber (32) respectively, the outer surface of the pump body (3) is provided with a water inlet (34) communicated with the first chamber (31) and a water outlet (35) communicated with the second chamber (32), the first impeller (1) is arranged in the first chamber (31), the first impeller (1) is arranged corresponding to the water inlet (34) and the communication passage (33), and the second impeller (2) is arranged in the second chamber (32), the second impeller (2) is arranged corresponding to the communication passage (33) and the water outlet (35).

2. The submersible sewage pump of claim 1, wherein The water inlet (34) is arranged on the bottom surface of the pump body (3), the water outlet (35) is arranged on the side surface of the pump body (3) facing the horizontal direction, the first chamber (31) is arranged below the second chamber (32) in a spaced manner, and the two ends of the communication passage (33) are communicated with one side of the first chamber (31) along the horizontal direction and the top end of the second chamber (32) respectively.

3. The submersible sewage pump of claim 1, wherein The communication passage (33) comprises a first communication section (331), a second communication section (332) and a third communication section (333) communicated in sequence, the first communication section (331) is communicated with the first chamber (31), the third communication section (333) is communicated with the second chamber (32), the first communication section (331) and the second communication section (332) have a first passage included angle a, the second communication section (332) and the third communication section (333) have a second passage included angle b, wherein the first passage included angle a is less than 135°, and the second passage included angle b is less than 135°.

4. The submersible sewage pump of claim 3, wherein The first communication section (331) and the second communication section (332) are provided with a first transition section (334) at the joint, and the second communication section (332) and the third communication section (333) are provided with a second transition section (335) at the joint.

5. The submersible sewage pump of claim 4, wherein, The first transition section (334) and the second transition section (335) comprise a circular arc section, the maximum radius of the circular arc section of the first transition section (334) and the maximum radius of the circular arc section of the second transition section (335) are 1.05 to 1.15 times the radius of the communication passage (33).

6. The submersible sewage pump of claim 1, wherein, The first chamber (31) and the communication passage (33) are provided with a first communication port (336), and the communication passage (33) and the second chamber (32) are provided with a second communication port (337). The first impeller (1) comprises a first wheel body (11) and a plurality of first blades (12), the plurality of first blades (12) are arranged on the outer side wall of the first wheel body (11), one side end surface of the first wheel body (11) is provided with a first inlet (111), the outer side wall of the first wheel body (11) is provided with a plurality of first outlets (112), the first inlet (111) is communicated with each of the first outlets (112), the first inlet (111) faces the first communication port (336), and rotation of the first impeller (1) can make the first outlet (112) face the first communication port (336). The second impeller (2) comprises a second wheel body (21) and a plurality of second blades (22), the plurality of second blades (22) are arranged on the outer side wall of the second wheel body (21), one side end surface of the second wheel body (21) is provided with a second inlet (211), the outer side wall of the first wheel body (11) is provided with a plurality of second outlets (212), the second inlet (211) is communicated with each of the second outlets (212), the second inlet (211) faces the second communication port (337), and rotation of the second impeller (2) can make the second outlet (212) face the water outlet (35).

7. The submersible sewage pump of claim 1, wherein Further comprising a rotation driver (4) and a rotating shaft (5), the pump body (3) is further provided with a communication hole (36), the communication hole (36) penetrates from the first chamber (31) to the second chamber (32), the rotating shaft (5) penetrates the first impeller (1), the second impeller (2) and the communication hole (36), and is connected to the first impeller (1) and the second impeller (2), the rotation driver (4) is connected to the rotating shaft (5), the rotation driver (4) is used for driving the rotating shaft (5) to rotate, so as to make the first impeller (1) and the second impeller (2) rotate.

8. The submersible sewage pump of claim 7, wherein, Further comprising a throttling sleeve (6), one side end surface of the first impeller (1) is provided with a first connecting part (13), one side end surface of the second impeller (2) is provided with a second connecting part (23), the first connecting part (13) and the second connecting part (23) are located in the communication hole (36) and are fixedly sleeved on the outer side of the rotating shaft (5), the throttling sleeve (6) is located in the communication hole (36) and is fixedly sleeved on the outer side of the first connecting part (13) and the second connecting part (23), there is a gap between the outer side wall of the throttling sleeve (6) and the hole wall of the communication hole (36), and the throttling sleeve (6) is used for guiding the medium in the first chamber (31) to the second chamber (32).

9. The submersible sewage pump of claim 8, wherein, The outer side wall of the throttling sleeve (6) is provided with a plurality of throttling grooves (61) which are spaced apart along the axial direction of the throttling sleeve (6) and surround the axis of the throttling sleeve (6), and the throttling groove (61) closest to the first chamber (31) penetrates to the end surface of the throttling sleeve (6) facing the first chamber (31).

10. The submersible sewage pump of claim 9, wherein, The throttle groove (61) is provided with a plurality of partition portions (62) connected to the groove wall and groove bottom of the throttle groove (61) and extending to the outer side wall of the throttle sleeve (6) in the radial direction of the throttle sleeve (6), and the plurality of partition portions (62) separate the throttle groove (61) into a plurality of sub-grooves (611).

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