Sewage pump with gas-liquid separation function

Abstract

The application discloses a sewage pump with gas-liquid separation function, comprising a motor, a motor output shaft, two impellers and a guide spiral body sleeved at the tail end of the motor output shaft, and a discharge support, a flow guide pump shell and a head connection seat which are sequentially sleeved outside the motor output shaft. The above-mentioned components form five communicating channels, and exhaust holes are arranged in the corresponding channels. By using centrifugal force, expansion settlement and slope guiding mechanism, multistage separation of gas-liquid mixture is realized. The design can effectively reduce the interference of gas on pump operation, significantly improve the reliability, efficiency and service life of the pump, and is especially suitable for gas-liquid mixed medium conveying in the fields of sewage treatment and chemical industry.

Description

Technical Field

[0001] This utility model relates to the field of sewage pump technology, specifically to a sewage pump with gas-liquid separation function. Background Technology

[0002] Traditional sewage pumps often face problems such as cavitation, vibration, and reduced efficiency when transporting liquids containing gas. When gas is entrained in the liquid, it tends to accumulate inside the pump, causing cavitation in localized areas of the impeller, disrupting the liquid continuity, and thus triggering cavitation, shortening the pump's lifespan. Simultaneously, the presence of gas reduces the pump's head and flow rate, increases energy consumption, and may even cause the pump to malfunction.

[0003] In existing technologies, some sewage pumps use a single gas-liquid separation structure, such as a simple centrifugal separation chamber or exhaust valve, but the separation efficiency is low and cannot meet the treatment needs of sewage with high gas content. Utility Model Content

[0004] To address the aforementioned technical problems, this application solves the issues of gas accumulation in the pump when the liquid contains gas and the use of a single gas-liquid separation structure in some sewage pumps.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a sewage pump with gas-liquid separation function, including a motor, wherein two impellers and a guide spiral are sequentially sleeved on the outer side of the motor output shaft from top to bottom, and the two impellers are the upper impeller and the lower impeller, with the lower impeller located above the guide spiral.

[0006] The motor output shaft is located below the motor and is suspended from top to bottom by a discharge bracket, a guide pump housing, and an inlet connector. This forms a first channel between the guide spiral and the inlet connector, a second channel between the lower impeller and the inlet connector that communicates with the first channel, a third channel formed by the exterior of the motor output shaft, the upper impeller, the lower impeller, and the guide pump housing that communicates with the second channel, a fourth channel between the upper impeller and the guide pump housing that communicates with the third channel, and a fifth channel within the discharge bracket that communicates with the fourth channel.

[0007] To better realize this utility model, the first segment channel, the third segment channel, and the fifth segment channel are respectively provided with a third exhaust hole, a second exhaust hole, and a first exhaust hole.

[0008] To better realize this utility model, the discharge bracket further includes a bracket base, a drain pipe and a support column are provided between the bracket base and the bracket top seat, a fourth mounting hole and a third mounting hole are respectively opened at the center of the bracket base and the bracket top seat, the third mounting hole and the fourth mounting hole are sleeved on the outside of the motor output shaft, a transition cylinder is provided at the top of the bracket top seat, and a mounting flange connected to the bottom of the motor is provided at the top of the transition cylinder, the bracket base has a spiral channel arranged spirally in the axial direction, the input end of the spiral channel is connected to the output end of the fourth channel, the output end of the spiral channel is connected to the input end of the drain pipe, the bracket base has a first vent hole, the input end of the first vent hole is located in the spiral channel, the output end of the first vent hole passes through the bracket base and the support column in sequence, and the spiral channel and the drain pipe constitute the fifth channel.

[0009] To better realize this utility model, the drain pipe is further divided into two independent drain channels by a corrugated baffle. The bottom of the corrugated baffle is located in the lower middle section of the drain pipe, and the top of the corrugated baffle is located at the outlet of the corrugated baffle. The surface of the corrugated baffle is corrugated.

[0010] To better realize this utility model, the flow guide pump housing further includes a pump housing body, the top outer edge of the pump housing body is sealed and fixedly connected to the bottom outer edge of the support base (for example, threaded holes are opened between them, and screws are screwed together), the pump housing body has an inner cavity arranged concentrically and an outer cavity surrounding the outer side of the inner cavity, an output hole that communicates vertically with the inner cavity is opened at the center of the top of the pump housing body, and a fifth mounting hole that communicates vertically with the inner cavity is opened at the center of the bottom of the pump housing body, the diameter of the output hole is larger than the diameter of the fifth mounting hole, and both the output hole and the fifth mounting hole are suspended outside the motor output shaft;

[0011] The outer cavity is divided into three equally spaced buffer chambers by three vertical partitions. The pump housing body has an inlet hole on the bottom surface of each buffer chamber, which is connected to the output end of the second channel. An annular notch is formed on the outer peripheral wall of the inner cavity, which connects the inner cavity and the outer cavity. The top of the outer cavity is set as an inclined surface sloping towards the center. A second exhaust hole is formed on the buffer chamber. The input end of the second exhaust hole is located on the inner top surface of the inclined surface, and the output end of the second exhaust hole is located on the outer peripheral wall of the outer cavity.

[0012] To better realize this utility model, the inlet connector further includes a connector body, the top outer edge of the connector body is sealed and fixedly connected to the bottom outer edge of the pump housing body, an installation channel is provided at the center of the connector body, the installation channel is suspended and sleeved outside the motor output shaft, a plurality of third exhaust holes are provided in the installation channel, the input end of the third exhaust hole is located at the upper section of the inner peripheral wall of the installation channel, and the output end of the third exhaust hole is located at the bottom surface of the installation channel.

[0013] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0014] 1. This utility model, through a unique five-stage channel design, combines centrifugal force, expansion sedimentation, and inclined plane guidance to achieve multi-stage gas-liquid separation, significantly improving separation efficiency. The first stage channel achieves primary crushing and pre-separation through a guiding spiral, avoiding blockage by large particles; subsequent stages gradually enhance the separation effect, finally completing the ultimate separation in the fifth stage channel, effectively reducing the impact of gas on the pump.

[0015] 2. This utility model features targeted vents (first, second, and third vents) at key channels to promptly discharge separated gas and prevent gas accumulation within the pump. In particular, innovative designs such as corrugated baffles and inclined surfaces further improve venting efficiency, ensure liquid continuity, and reduce the risk of cavitation.

[0016] 3. This invention achieves thorough gas-liquid separation, reducing cavitation, vibration, and wear, and extending the pump's service life. Simultaneously, the pulverizing function of the guide spiral can handle wastewater containing particulate impurities, enhancing the pump's anti-clogging ability and reducing maintenance costs.

[0017] 4. This invention, by reducing gas interference, improves the pump's head and flow stability, reduces energy consumption, and significantly enhances operating efficiency. Experimental data shows that, compared with traditional sewage pumps, this invention can reduce energy consumption by 15%-20% while increasing flow rate by 10%-15% under the same operating conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram showing the assembly of the motor, motor output shaft, impeller, and guide spiral in this utility model; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 This is a schematic diagram of the impeller structure; Figure 7 A schematic diagram of the structure guiding the helix; Figure 8 This is a schematic diagram of the ejection stent structure; Figure 9 for Figure 8 Cross-section Figure 1 ; Figure 10 for Figure 8 Cross-section Figure 2 ; Figure 11 for Figure 8 Cross-section Figure 3 ; Figure 12 for Figure 8 Side view; Figure 13 This is a schematic diagram of the structure of the diversion pump casing; Figure 14 for Figure 13 A bottom view; Figure 15 for Figure 13 Cross-section Figure 1 ; Figure 16 for Figure 13 Cross-section Figure 2 ; Figure 17 for Figure 13 Perspective view; Figure 18 This is a schematic diagram of the inlet connector. Figure 19 for Figure 18 A sectional view.

[0020] Explanation of reference numerals in the attached drawings: 100-Motor; 101-Motor output shaft; 102-Inner positioning sleeve; 103-Outer positioning sleeve; 104-Short adjusting sleeve; 105-Long adjusting sleeve; 200-Impeller; 201-First mounting hole; 300-Guide spiral; 301-Second mounting hole; 400-Discharge bracket; 401-Bracket base; 402-Drain pipe; 403-Wave baffle; 404-Third mounting hole; 405-Fourth mounting hole; 406-First vent hole; 407-Drain pipe inlet; 408-Support column; 409-Mounting flange; 410-Bracket top seat; 500-Flow pump casing; 501-Pump casing body; 502-Fifth mounting hole; 503-Vertical partition; 504-Separated buffer chamber; 505-Inclined surface; 506-Second vent hole; 507-Inlet hole; 600-Inlet connector; 601-Connector body; 602-Mounting channel; 603-Third vent hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0022] Example 1

[0023] like Figures 1 to 19 As shown, a sewage pump with gas-liquid separation function includes a motor 100. Two impellers 200 and a guide spiral 300 are sequentially fitted onto the outer end of the motor output shaft 101 of the motor 100 from top to bottom. The two impellers 200 are an upper impeller 200 and a lower impeller 200, with the lower impeller 200 located above the guide spiral 300. Each impeller 200 has a first mounting hole 201 at its center, which is fitted onto the outer side of the corresponding motor output shaft 101. The guide spiral 300 has a second mounting hole 301 at its center, which is also fitted onto the outer side of the corresponding motor output shaft 101.

[0024] The motor output shaft 101 is located below the motor 100 and is suspended from top to bottom by a discharge bracket 400, a guide pump housing 500, and an inlet connector 600. This forms a first channel between the guide spiral 300 and the inlet connector 600, a second channel between the lower impeller 200 and the inlet connector 600 that communicates with the first channel, a third channel formed by the exterior of the motor output shaft 101, the upper impeller 200, the lower impeller 200, and the guide pump housing 500 that communicates with the second channel, a fourth channel between the upper impeller 200 and the guide pump housing 500 that communicates with the third channel, and a fifth channel within the discharge bracket 400 that communicates with the fourth channel.

[0025] like Figures 1 to 19 As shown, in this embodiment, the first channel segment, the third channel segment, and the fifth channel segment are respectively provided with a third exhaust hole 603, a second exhaust hole 506, and a first exhaust hole 406.

[0026] like Figures 1 to 19As shown, in this embodiment, the discharge bracket 400 includes a bracket base 401. A drain pipe 402 and a support column 408 are provided between the bracket base 401 and the bracket top seat 410. A fourth mounting hole 405 and a third mounting hole 404 are respectively opened at the center positions of the bracket base 401 and the bracket top seat 410. The third mounting hole 404 and the fourth mounting hole 405 are sleeved on the outside of the motor output shaft 101. A transition cylinder is provided on the top of the bracket top seat 410. A mounting flange 409 connected to the bottom of the motor 100 is provided on the top of the transition cylinder. A spiral channel is provided inside the support base 401, which is spirally arranged in the axial direction. The input end of the spiral channel is connected to the output end of the fourth channel, and the output end of the spiral channel is connected to the input end of the drain pipe 402 (the input end of the drain pipe 402 is the drain pipe inlet 407). A first vent hole 406 is provided on the support base 401. The input end of the first vent hole 406 is located in the spiral channel, and the output end of the first vent hole 406 passes through the support base 401 and the support column 408 in sequence. The spiral channel and the drain pipe 402 constitute the fifth channel.

[0027] like Figures 1 to 19 As shown, in this embodiment, the drain pipe 402 is divided into two independent drain channels by a corrugated baffle 403. The bottom of the corrugated baffle 403 is located in the lower middle section of the drain pipe 402, and the top of the corrugated baffle 403 is located at the outlet of the corrugated baffle 403. The surface of the corrugated baffle 403 is corrugated.

[0028] like Figures 1 to 19 As shown, in this embodiment, the flow pump housing 500 includes a pump housing body 501. The top outer edge of the pump housing body 501 is sealed and fixedly connected to the bottom outer edge of the support base 401 (for example, threaded holes are opened between them, and screws are screwed together). The pump housing body 501 has an inner cavity arranged concentrically and an outer cavity surrounding the inner cavity. An output hole that communicates vertically with the inner cavity is opened at the center of the top of the pump housing body 501. A fifth mounting hole 502 that communicates vertically with the inner cavity is opened at the center of the bottom of the pump housing body 501. The diameter of the output hole is larger than the diameter of the fifth mounting hole 502. The output hole and the fifth mounting hole 502 are both suspended and sleeved outside the motor output shaft 101.

[0029] The interior of the outer cavity is equally divided into three partitioned buffer chambers 504 by three vertical partitions 503. The pump housing body 501 has an inlet hole 507 on the bottom surface of each partitioned buffer chamber 504. The inlet hole 507 is connected to the output end of the second channel. An annular notch is formed on the outer peripheral wall of the inner cavity, which connects the inner cavity and the outer cavity. The top of the outer cavity is set as an inclined surface 505 sloping towards the center. A second exhaust hole 506 is formed on the partitioned buffer chamber 504. The input end of the second exhaust hole 506 is located on the inner top surface of the inclined surface 505, and the output end of the second exhaust hole 506 is located on the outer peripheral wall of the outer cavity.

[0030] like Figures 1 to 19 As shown, in this embodiment, the inlet connector 600 includes a connector body 601. The top outer edge of the connector body 601 is sealed and fixedly connected to the bottom outer edge of the pump housing body 501 (for example, threaded holes are opened between them, and screws are screwed together). An installation channel 602 is provided at the center of the connector body 601. The installation channel 602 is suspended and sleeved outside the motor output shaft 101. A plurality of third exhaust holes 603 are provided in the installation channel 602. The input end of the third exhaust hole 603 is located at the upper section of the inner peripheral wall of the installation channel 602, and the output end of the third exhaust hole 603 is located at the bottom surface of the installation channel 602.

[0031] Additionally, the third mounting hole 404 is suspended outside the motor output shaft 101, and the fourth mounting hole 405 is fitted outside the motor output shaft 101 via an inner positioning sleeve 102 and an outer positioning sleeve 103. Specifically, the inner positioning sleeve 102 is fitted outside the motor output shaft 101, the outer positioning sleeve 103 is fitted outside the inner positioning sleeve 102, and the fourth mounting hole 405 is fitted outside the outer positioning sleeve 103. A short adjusting sleeve 104 is fitted outside the motor output shaft 101 located between the inner positioning sleeve 102 and the upper impeller 200, and a long adjusting sleeve 105 is fitted outside the motor output shaft 101 located between the upper impeller 200 and the lower impeller 200.

[0032] By using existing sealing structures, such as the design of sealing rings, a seal is formed between the upper surface of the lower impeller 200 and the bottom surface of the pump housing body 501, and a seal is formed between the upper surface of the upper impeller 200 and the bottom surface of the support base 401 located at the center of the spiral channel.

[0033] The impeller 200, the guide spiral 300, and their installation methods are existing mature technologies.

[0034] The specific analysis is as follows:

[0035] I. Detailed Explanation of Channel Structure and Gas-Liquid Separation Mechanism in Each Section

[0036] 1. First stage: Primary crushing and pre-separation

[0037] Structural details: The system is formed by a guide spiral 300 (located below the lower impeller 200) and an inlet connector 600 (bottom component). The inner side of the channel corresponds to the rotation path of the guide spiral 300, and the outer side is attached to the inner wall of the inlet connector 600. Multiple third exhaust holes 603 (exhaust holes) are opened on the upper section of the inner peripheral wall of the mounting channel 602 (center hole) of the inlet connector 600. The input end faces the inside of the channel, and the output end extends through to the bottom surface of the inlet connector 600.

[0038] Separation mechanism:

[0039] When the gas-liquid mixture first enters the first channel, it is subjected to a dual effect due to the high-speed rotation of the guide spiral 300:

[0040] Mechanical crushing: The blade structure of the guide spiral 300 cuts large particles of impurities in the mixture, preventing blockage of subsequent channels;

[0041] Centrifugal pre-separation: The centrifugal force generated by rotation causes the denser liquid to gather on the outside of the channel (inner wall of the inlet connector 600), while the less dense gas gathers in the center of the channel (near the motor output shaft 101). Some of the gas is discharged directly through the third exhaust port 603, completing the first exhaust.

[0042] 2. Second channel: Centrifugal guidance and diversion

[0043] Structural details: The channel is formed by the outer periphery of the lower impeller 200 and the inner wall of the inlet connector 600. The channel cross-section is annular, and the bottom is connected to the third channel through the inlet hole 507 (the inlet hole at the bottom of the guide pump casing 500). The lower impeller 200 rotates synchronously with the motor output shaft 101, and its outer wall is designed with guide ribs.

[0044] Separation mechanism:

[0045] After the gas-liquid mixture is processed in the first stage, it enters the second stage and is driven by the centrifugal force of the rotating lower impeller 200:

[0046] The mixture moves in a circular motion along the inner wall of the channel. The liquid adheres to the outer wall of the inlet connector 600 due to inertia, while the gas moves towards the inner side of the channel (close to the motor output shaft 101) under the action of centrifugal force.

[0047] The guide ridge directs the mixture toward the inlet hole 507. At this time, the liquid is closer to the outer wall and is more likely to enter the inlet hole 507. Some of the gas that has not been discharged enters the third section along with the liquid. The separated gas has formed a stratification trend of "liquid outside and gas inside (liquid outside and gas inside)".

[0048] 3. Third section: Expansion and Settlement and Secondary Exhaust

[0049] Structural details: It is composed of the outer part of the motor output shaft 101, the upper impeller 200, the lower impeller 200, and the outer cavity of the guide pump casing 500 (including three partition buffer chambers 504). The partition buffer chamber 504 is an enlarged fan-shaped cavity (divided by vertical partitions 503), with an inclined surface 505 (sloping surface) sloping towards the center at the top, and a second exhaust port 506 (exhaust port) opened on the outer side wall.

[0050] Separation mechanism:

[0051] After some of the undischarged gas and the mixture of liquid and gas enter the partition buffer chamber 504 through the inlet 507, the chamber volume suddenly expands:

[0052] The flow rate drops sharply: the liquid kinetic energy decreases, and under the influence of gravity and the weak centripetal force of the rotation of the motor output shaft 101, it gathers towards the center of the motor output shaft 101 and enters the central channel (inner cavity) through the annular notch in the inner cavity.

[0053] Gas rising: Due to its low density, the residual gas in the mixture floats upward along the inclined surface 505, gathers at the top outer edge of the partition buffer chamber 504, and is finally discharged through the second exhaust port 506, thus achieving secondary exhaust.

[0054] This stage utilizes "capacity expansion + gravity + inclined plane guidance" to significantly improve the separation efficiency of liquid and gas.

[0055] 4. Fourth channel: Centrifugal enhancement and flow direction conversion

[0056] Structural details: It is formed by the outer periphery of the upper impeller 200 and the top inner wall of the guide pump housing 500. The input end at the bottom of the fourth channel is connected to the output hole of the inner cavity of the guide pump housing 500, and the output end at the top of the fourth channel is connected to the spiral inlet of the fifth channel.

[0057] Separation mechanism:

[0058] The liquid (containing a small amount of residual gas) after the third stage separation enters the fourth stage, where it is subjected to centrifugal force by the upper impeller 200:

[0059] The liquid is once again thrown to the outside of the channel (close to the top inner wall of the guide pump casing 500), while the residual gas gathers towards the center of the channel (near the motor output shaft 101), forming a stratification trend of "liquid outside and gas inside (liquid outside and gas inside)" again.

[0060] The guide vane guides the mixture of "liquid outside and gas inside (liquid outside and gas inside)" to flow along the spiral trajectory and directs it to the spiral inlet of the fifth channel, preparing for final separation.

[0061] 5. Fifth Channel: Ultimate Separation

[0062] Entering the spiral channel of the fifth section, the gas is divided and floats at the top of the spiral channel, while the liquid is located at the bottom. The gas is discharged by one or more first exhaust holes 406, while the remaining liquid enters the drain pipe 402 and is then diverted and discharged.

[0063] This invention is particularly suitable for applications where air bubbles enter the oil in oil-water media, creating a vacuum that affects the water pump's output, causing it to gradually decrease or even stop outputting water. It is widely used in grinding and chipping conditions.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A sewage pump with gas-liquid separation function, characterized in that: Includes a motor (100), and the motor output shaft (101) of the motor (100) is fitted with two impellers (200) and a guide spiral (300) from top to bottom on the outer side of the end. The two impellers (200) are the upper impeller (200) and the lower impeller (200), and the lower impeller (200) is located above the guide spiral (300). The motor output shaft (101) is located below the motor (100) and is suspended from top to bottom by a discharge bracket (400), a guide pump housing (500), and an inlet connector (600). This forms a first channel between the guide spiral (300) and the inlet connector (600), a second channel between the lower impeller (200) and the inlet connector (600) that communicates with the first channel, a third channel formed by the exterior of the motor output shaft (101), the upper impeller (200), the lower impeller (200), and the guide pump housing (500) that communicates with the second channel, a fourth channel between the upper impeller (200) and the guide pump housing (500) that communicates with the third channel, and a fifth channel opened inside the discharge bracket (400) that communicates with the fourth channel.

2. A sewage pump with gas-liquid separation function according to claim 1, characterized in that: The first channel, the third channel, and the fifth channel are respectively provided with a third exhaust hole (603), a second exhaust hole (506), and a first exhaust hole (406).

3. A sewage pump with gas-liquid separation function according to claim 1 or 2, characterized in that: The discharge bracket (400) includes a bracket base (401), a drain pipe (402) and a support column (408) are provided between the bracket base (401) and the bracket top seat (410), a fourth mounting hole (405) and a third mounting hole (404) are respectively opened at the center of the bracket base (401) and the bracket top seat (410), the third mounting hole (404) and the fourth mounting hole (405) are sleeved on the outside of the motor output shaft (101), a transition cylinder is provided at the top of the bracket top seat (410), and the top of the transition cylinder is provided with a connection to the bottom of the motor (100). The mounting flange (409) has a spiral channel arranged spirally along the axial direction inside the support base (401). The input end of the spiral channel is connected to the output end of the fourth channel. The output end of the spiral channel is connected to the input end of the drain pipe (402). The support base (401) has a first vent hole (406). The input end of the first vent hole (406) is located inside the spiral channel. The output end of the first vent hole (406) passes through the support base (401) and the support column (408) in sequence. The spiral channel and the drain pipe (402) constitute the fifth channel.

4. A sewage pump with gas-liquid separation function according to claim 3, characterized in that: The drain pipe (402) is divided into two independent drain channels by a corrugated baffle (403). The bottom of the corrugated baffle (403) is located in the lower middle section of the drain pipe (402), and the top of the corrugated baffle (403) is located at the outlet of the corrugated baffle (403). The surface of the corrugated baffle (403) is wavy.

5. A sewage pump with gas-liquid separation function according to claim 1, 2 or 4, characterized in that: The flow guide pump housing (500) includes a pump housing body (501), an inner cavity arranged concentrically inside the pump housing body (501) and an outer cavity surrounding the outer side of the inner cavity, an output hole vertically communicating with the inner cavity is opened at the center of the top of the pump housing body (501), and a fifth mounting hole (502) vertically communicating with the inner cavity is opened at the center of the bottom of the pump housing body (501), the diameter of the output hole is larger than the diameter of the fifth mounting hole (502), and both the output hole and the fifth mounting hole (502) are suspended and sleeved outside the motor output shaft (101); The interior of the outer cavity is divided into three partition buffer chambers (504) by three vertical partitions (503). The pump housing body (501) has an inlet hole (507) on the bottom surface of each partition buffer chamber (504). The inlet hole (507) is connected to the output end of the second channel. An annular notch is provided on the outer peripheral wall of the inner cavity, which connects the inner cavity and the outer cavity. The top of the outer cavity is set as an inclined surface (505) that tilts towards the center. A second exhaust hole (506) is provided on the partition buffer chamber (504). The input end of the second exhaust hole (506) is located on the inner top surface of the inclined surface (505), and the output end of the second exhaust hole (506) is located on the outer peripheral wall of the outer cavity.

6. A sewage pump with gas-liquid separation function according to claim 1, characterized in that: The inlet connector (600) includes a connector body (601), and an installation channel (602) is provided at the center of the connector body (601). The installation channel (602) is suspended outside the motor output shaft (101). Multiple third exhaust holes (603) are provided inside the installation channel (602). The input end of the third exhaust hole (603) is located at the upper section of the inner peripheral wall of the installation channel (602), and the output end of the third exhaust hole (603) is located at the bottom surface of the installation channel (602).

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