CN115182883B

CN115182883B - Self-priming pump

Info

Publication number: CN115182883B
Application number: CN202210811966.8A
Authority: CN
Inventors: 张君波; 杨克; 洪利兵
Original assignee: Ningbo Junhe Intelligent Technology Co ltd
Current assignee: Ningbo Junhe Intelligent Technology Co ltd
Priority date: 2022-07-12
Filing date: 2022-07-12
Publication date: 2024-01-02
Anticipated expiration: 2042-07-12
Also published as: CN115182883A

Abstract

The utility model relates to a water pump technical field especially relates to a self priming pump, solves the lower problem of self priming pump gas-liquid separation efficiency among the prior art, a self priming pump, including the pump body, be provided with pump cavity and impeller room in the pump body, the impeller room is provided with impeller and stator disc, the stator disc sets up in the impeller outside, the stator disc is provided with a plurality of guide vanes, and two adjacent guide vanes form the guide duct, be provided with the guide vane export on the guide duct, be provided with maze gas-liquid separation passageway between guide vane export and the pump cavity; a liquid inlet channel is arranged in the pump cavity, a backflow inlet is arranged on the liquid inlet channel, and the pump cavity is communicated with the liquid inlet channel through the backflow inlet; the pump cavity is internally provided with a gas-liquid separation assembly, the gas-liquid separation assembly comprises a water baffle, and the labyrinth gas-liquid separation channel is arranged between the guide vane outlet and the water baffle.

Description

Self-priming pump

Technical Field

The disclosure relates to the technical field of water pumps, in particular to a self-priming pump.

Background

The centrifugal pump is a fluid machine for transferring liquid by the centrifugal force generated by the rotation of an impeller, is widely applied to the fields of urban sewage disposal, farm irrigation, petroleum transportation, marine ships, chemical industry and the like, and is a special centrifugal pump, and is also called a self-priming centrifugal pump. The centrifugal pump and the self-priming pump are of pump type commonly used in industrial production, the self-priming pump and the centrifugal pump discharge water through the operation of the impeller, and the self-priming pump has the advantages of compact structure, convenience in operation, stable operation, easiness in maintenance, high efficiency, long service life, stronger self-priming capability and the like, can disperse water into fine raindrops for spraying, is a good tool for farms, nursery gardens, orchards and vegetable gardens, is mostly matched with an internal combustion engine, is arranged on a movable trolley, and is suitable for field operation.

The self-priming pump consists of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a gas-liquid separation chamber and the like, and the working principle is as follows: before the water pump is started, water is filled in the pump shell (or water is stored in the pump shell), after the water pump is started, the impeller rotates at a high speed to enable water in the impeller channel to flow to the volute, at the moment, the inlet forms vacuum, the water inlet check valve is opened, air in the suction pipe enters the pump and reaches the outer edge through the impeller channel, a bottom valve is not required to be installed on a pipeline, the quantitative liquid guiding is only required to be stored in the pump body before the self-priming pump works, and different liquids can be self-priming pumps made of different materials.

The Chinese patent with the publication number of CN209483617U discloses a gas-liquid separation device of a self-priming pump, which is provided with a pump body, a pump water inlet, a vertical water outlet and a parallel water outlet, wherein an impeller chamber and an inner cavity are arranged in the pump body, the impeller chamber is internally provided with an impeller, and the inner cavity is divided into a water inlet channel and a water outlet channel by a partition plate, and the gas-liquid separation device is characterized in that: one end of the water inlet channel is connected with the water inlet of the pump, and the other end of the water inlet channel is connected with the water inlet of the impeller chamber; one end of the water outlet channel is connected with the impeller chamber water outlet, the other end of the water outlet channel is connected with the vertical water outlet and the parallel water outlet, the bottom of the parallel water outlet in the water outlet channel is provided with a gas-liquid separation baffle, the gas-liquid separation baffle extends towards the vertical water outlet along the bottom of the parallel water outlet and separates the water outlet channel into two parts with mutually communicated tops, and the gas-liquid separation baffle can enable liquid thrown out of the impeller chamber water outlet to naturally fall back into the impeller chamber due to gravity after being blocked by the gas-liquid separation baffle under the condition that the parallel water outlet is not closed, so that the self-priming function is completed rapidly, and the mounting condition of the self-priming pump is improved. However, since the liquid thrown out by the impeller naturally falls back to the impeller chamber by gravity, the whole process of gas-liquid separation is not efficient enough.

Disclosure of Invention

The self-priming pump is simple in structure and high in gas-liquid separation efficiency.

The technical scheme adopted by the present disclosure for solving the technical problems is as follows: the self-priming pump comprises a pump body, wherein a pump cavity and an impeller chamber are arranged in the pump body, the impeller chamber is provided with an impeller and a guide vane disc, the guide vane disc is arranged outside the impeller, the guide vane disc is provided with a plurality of guide vanes, two adjacent guide vanes form a guide runner, a guide vane outlet is arranged on the guide runner, and a labyrinth gas-liquid separation channel is arranged between the guide vane outlet and the pump cavity; the pump cavity is internally provided with a liquid inlet channel, a backflow inlet is arranged on the liquid inlet channel, and the pump cavity is communicated with the liquid inlet channel through the backflow inlet.

Compared with the existing products, the beneficial effects of the present disclosure are: the self-priming pump is provided with the labyrinth gas-liquid separation channel, and the flow rate of the gas is faster than that of the liquid, the speed of the gas is hardly influenced by the labyrinth, the flow rate of the liquid is greatly slowed down, and the gas-liquid mixture can be rapidly and effectively separated; the liquid inlet channel is provided with a backflow inlet, the gas-liquid mixture in the pump cavity enters the liquid inlet channel from the backflow inlet, negative pressure is formed in the liquid inlet channel, liquid can enter the liquid inlet channel from the first liquid inlet, and the self-priming process of the self-priming pump is quickened.

Further, a gas-liquid separation assembly is arranged in the pump cavity and comprises a water baffle, and the labyrinth gas-liquid separation channel is arranged between the guide vane outlet and the water baffle.

In some embodiments, the gas-liquid separation assembly further comprises a baffle plate, the baffle plate is a disc, the lower edge of the baffle plate is attached to the bottom of the pump cavity, and the baffle plate, the baffle plate and the bottom of the pump cavity form a gas-liquid separation cavity.

In some embodiments, the gas-liquid separation assembly further comprises a baffle plate and a baffle plate, the baffle plate is disc-shaped, the baffle plate and the baffle plate are connected through the baffle plate, and the baffle plate, the baffle plate and the baffle plate form a gas-liquid separation cavity.

Further, the gas-liquid separation cavity is provided with an opening near the upper part of the pump cavity.

Further, the guide vane disc is a disc type, the size of the guide vane disc is matched with the size of the partition plate, a first mounting hole is formed in the guide vane disc, and the first mounting hole is used for mounting the impeller.

Further, a plurality of first bulges are arranged between the partition plate and the guide vane disc, the first bulges are arranged right opposite to the guide vane disc, the first bulges are uniformly distributed along the circumferential direction of the disc type, and guide vane outlets on the guide vane disc are arranged right opposite to the partition plate.

Further, the first protrusions are strip-shaped protrusions.

In some embodiments, the spacer and the first protrusion are fixedly connected.

In some embodiments, the vane disc and the first protrusion are fixedly connected.

Further, an inclined plane is arranged on the guide channel and used for enabling liquid thrown out by the impeller to smoothly enter the guide vane outlet along the guide channel and flow out of the guide vane outlet.

Further, the inclined plane is arranged on one side, close to the impeller, of the guide vane outlet, and a second protrusion is arranged on the other side of the guide vane outlet.

Further, one end of the liquid inlet channel is provided with a first liquid inlet, the other end of the liquid inlet channel is provided with a first liquid outlet, the first liquid inlet is formed in the pump body, the impeller is provided with a second liquid inlet, and the second liquid inlet is communicated with the first liquid outlet.

Further, the reflux inlet is arranged below the liquid inlet channel, a lug is arranged at the position, close to the first liquid inlet, of the liquid inlet channel and is used for preventing liquid in the liquid inlet channel from overflowing from the first liquid inlet, and the caliber of the reflux inlet is smaller than the diameter of any position of the liquid inlet channel.

Further, a first working hole is formed in the partition plate, a second working hole is formed in the water baffle plate, and the liquid inlet channel penetrates through the first working hole and the second working hole.

Further, the aperture of the first working hole is larger than that of the second working hole.

Further, a first outlet and a water outlet are arranged on the pump body, the first outlet is arranged above the pump body, the first outlet is used for discharging liquid and gas, the water outlet is used for discharging liquid in the pump cavity, and the water outlet is arranged at the bottom of the pump body.

Further, the first outlet and the first liquid inlet are vertically arranged.

Further, a cover plate is arranged on one side, away from the pump cavity, of the impeller chamber, the cover plate is used for separating the impeller chamber from the external environment, a driving mechanism is arranged on one side, away from the impeller chamber, of the cover plate, and the driving mechanism is used for providing driving force for the impeller.

Still further, the apron is provided with the second mounting hole, actuating mechanism is the motor, the motor passes through the drive shaft and is connected with the impeller, the motor drive shaft passes second mounting hole and impeller connection.

Furthermore, a water filling port is further arranged on the pump body, and the water filling port is communicated with the pump cavity.

Drawings

The present application will be described in further detail below in conjunction with the drawings and preferred embodiments, but it will be appreciated by those skilled in the art that these drawings are drawn for the purpose of illustrating the preferred embodiments only and thus should not be taken as limiting the scope of the present application. Moreover, unless specifically indicated otherwise, the drawings are merely schematic representations, not necessarily to scale, of the compositions or constructions of the described objects and may include exaggerated representations.

FIG. 1 is one of the cross-sectional views of a self-priming pump of the present disclosure;

FIG. 2 is a second cross-sectional view of a self-priming pump of the present disclosure;

FIG. 3 is a third cross-sectional view of a self-priming pump of the present disclosure;

FIG. 4 is one of the schematic structural views of the vane disk of the present disclosure;

FIG. 5 is a second schematic view of a vane disk structure of the present disclosure;

FIG. 6 is one of the schematic diagrams of the structure of the gas-liquid separation chamber of the present disclosure;

FIG. 7 is a second schematic view of the structure of the gas-liquid separation chamber of the present disclosure.

Reference numerals illustrate:

1. a first liquid inlet; 2. pouring a water gap; 3. a first outlet; 4. a guide vane disc; 5. a gas-liquid separation chamber; 6. a liquid inlet channel; 7. a water outlet; 8. a first liquid outlet; 9. a pump chamber; 10. coaming plate; 11. a water baffle; 12. a partition plate; 13. a first protrusion; 14. a first working hole; 15. a second working hole; 16. a return inlet; 17. a guide vane; 18. a separation hole; 19. a bump; 20. a second protrusion; 21. a guide vane outlet; 22. a flow guide channel.

Detailed Description

In order to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present disclosure.

In the description of the present invention, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

It will be appreciated by those skilled in the art that in the present disclosure, the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc. refer to an orientation or positional relationship based on that shown in the drawings, which is merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore the above terms should not be construed as limiting the present invention.

An embodiment of the present disclosure discloses a self-priming pump, as shown in fig. 1-7.

The utility model provides a self priming pump, including the pump body, be provided with pump chamber 9 and impeller room in the pump body, the impeller room is provided with impeller and stator disc 4, here the impeller is centrifugal impeller, it makes the air boost pressure by utilizing centrifugal force acting, stator disc 4 sets up in the impeller outside, stator disc 4 is provided with a plurality of guide vanes 17, two adjacent guide vanes 17 form guide runner 22, be provided with guide vane export 21 on the guide runner 22, be provided with labyrinth gas-liquid separation passageway between guide vane export 21 and the pump chamber 9, be provided with feed liquor passageway 6 and gas-liquid separation subassembly in the pump chamber 9.

In some embodiments, the gas-liquid separation assembly comprises a water baffle 11 and a baffle 12, the water baffle 11 is fixedly connected with the liquid inlet channel 6, the lower edge of the water baffle 11 is attached to the bottom of the pump cavity 9, and the water baffle 11, the baffle 12 and the bottom of the pump cavity 9 form a gas-liquid separation cavity.

In some embodiments, the gas-liquid separation assembly includes a baffle 11, a shroud 10, and a baffle 12, the baffle 12, shroud 10, and baffle 11 forming the gas-liquid separation chamber 5. Specifically, the partition plate 12 is a disc, including annular bottom surface and around the annular protruding that the bottom surface periphery set up, the stator dish 4 is the disc, the size of stator dish 4 and the size phase-match of partition plate 12, the annular protruding laminating of edge and the partition plate 12 of stator dish 4, the guide vane export 21 sets up the afterbody at guide runner 22, guide vane export 21 evenly distributed along the circumferencial direction, guide vane export 21 is circular or oval or polygon, the shape and the size of every guide vane export 21 are unanimous, here do not limit to the specific shape and the size of guide vane export 21. The water baffle 11 is U-shaped, the gas-liquid separation cavity 5 is arranged with an opening upwards in the pump cavity 9, and the disc-shaped partition 12 enables the shape of the gas-liquid separation assembly to be adapted to the shape of the pump cavity 9. A gap is arranged between the bottom of the gas-liquid separation cavity 5 and the bottom of the pump cavity, so that the impeller is prevented from vibrating the gas-liquid separation cavity 5 during rotation, further rubbing the bottom of the pump cavity 9 and generating noise, and an opening is arranged on the upper part of the gas-liquid separation cavity 5, which is close to the pump cavity 9, for discharging gas and liquid out of the gas-liquid separation cavity 5.

It will be appreciated that the centre of the guide vane disc 4 is provided with a first mounting hole for mounting an impeller which continues to rotate in the impeller chamber to generate centrifugal force and the gas-liquid mixture is ejected along the guide channel 22 from the guide vane outlet 21. A plurality of strip-shaped first protrusions 13 are arranged between the partition plate 12 and the guide vane disk 4, and the first protrusions 13 are uniformly distributed along the circumferential direction of the disk, and it is noted that the guide vane outlets 21 on the guide vane disk 4 are arranged opposite to the partition plate 12, so that the gas-liquid mixture flowing out from the guide vane outlets 21 can strike the partition plate 12.

In some embodiments, the separator 12 and the first protrusion 13 are fixedly connected, so that the gas-liquid mixture is better separated from the liquid by collision of the first protrusion 13.

In some embodiments, the vane disc 4 and the first protrusion 13 are fixedly connected, so that the gas-liquid mixture is impacted by the first protrusion 13 to separate the gas and the liquid better.

In some embodiments, the flow guide 22 is provided with a downward slope, which is arranged to enable liquid thrown by the impeller to enter the guide vane outlet 21 along the flow guide 22 more quickly and flow out of the guide vane outlet 21. It can be appreciated that after the impeller throws out the gas-liquid mixture, the gas enters the guide runner 22, the gas flow velocity is fast to be spread, the liquid enters the guide vane outlet 21 along the guide runner 22 through the downward inclined surface, and the liquid flows out of the guide vane outlet 21 smoothly and fast due to the arrangement of the inclined surface.

The tail of the guide vane outlet 21 is provided with a second protrusion 20, and the second protrusion 20 is used for preventing the liquid flowing down from the inclined surface from being flushed out of the guide vane disk 4, so that the liquid flowing down from the inclined surface can collide with the second protrusion 20, and finally is deflected back to the guide vane outlet 21. In addition, the provision of the second protrusions 20 makes the flow rate of the liquid through the additional collision slower, while the flow rate of the gas is hardly affected, so that the gas-liquid separation effect is better.

The inlet channel 6 one end is provided with first inlet 1, and the other end is provided with first liquid outlet 8, and first inlet 1 sets up on the pump body, and the impeller is provided with the second inlet, and second inlet and first liquid outlet 8 intercommunication. The partition plate 12 is provided with a first working hole 14, the water baffle plate 11 is provided with a second working hole 15, the aperture of the first working hole 14 is larger than that of the second working hole 15, and the liquid inlet channel 6 passes through the first working hole 14 and the second working hole 15.

It should be noted that, a backflow inlet 16 is disposed below the liquid inlet channel 6, and the backflow inlet 16 is disposed near the lower portion of the pump chamber 9, so that fluid enters the liquid inlet channel 6 from the backflow inlet 16. The pump cavity is communicated with the liquid inlet channel 6 through the backflow inlet 16, the liquid inlet channel 6 is in an arc trend, the diameter of the liquid inlet channel 6 is not constant in the pump cavity 9, and the caliber of the backflow inlet 16 is smaller than the diameter of any position of the liquid inlet channel 6. Liquid in the pump cavity 9 enters the liquid inlet channel 6 through the backflow inlet 16 and then enters the impeller, the liquid is thrown into the guide channel 22 under the action of centrifugal force of the impeller, so that the pressure of the liquid inlet channel 6 is smaller than the pressure in the pump cavity 9, the liquid can conveniently enter the liquid inlet channel 6 through the first liquid inlet 1, meanwhile, the flow velocity of the liquid entering the liquid inlet channel 6 through the backflow inlet 16 is increased due to the fact that the caliber of the backflow inlet 16 is smaller than the diameter of the liquid inlet channel 6, the pressure in the liquid inlet channel 6 is further reduced, and the liquid can enter through the first liquid inlet 1.

The position of the liquid inlet channel 6 close to the first liquid inlet 1 is provided with a lug 19, and the lug 19 is arranged on the inner wall below the liquid inlet channel 6 and used for preventing liquid in the liquid inlet channel 6 from overflowing from the first liquid inlet 1, so that the liquid inlet channel 6 has a higher water level.

The pump body is provided with a first outlet 3 and a water outlet 7, the first outlet 3 is arranged above the pump body, the first outlet 3 is used for discharging gas and a small amount of liquid out of the pump cavity 9, and the water outlet 7 is arranged at the bottom of the pump body and is used for discharging the liquid in the pump cavity 9.

It will be appreciated that the side of the impeller chamber remote from the pump chamber 9 is provided with a cover plate for separating the impeller chamber from the external environment, and the side of the cover plate remote from the impeller chamber is provided with a motor for providing driving force to the impeller, and the cover plate is provided with a second mounting hole through which the motor is connected to the impeller, and the motor drive shaft passes through the second mounting hole to be connected to the impeller.

Preferably, the water baffle 11 is further provided with a separation hole 18, when the gas-liquid mixture enters the gas-liquid separation cavity 5, the gas-liquid mixture forms small bubbles in the separation hole, then the small bubbles are converged into larger bubbles, the bubbles move upwards to a certain extent when the volume of the bubbles is large, and finally are discharged from the first outlet 3, and at the same time, a part of liquid flows out of the separation hole 18, so that the effect of gas-liquid separation is achieved, the pressure intensity in the gas-liquid separation cavity 5 is reduced, and the self-priming efficiency of the self-priming pump is further improved.

The pump body is also provided with a water filling port 2, the water filling port 2 is communicated with the pump cavity 9, and water is introduced from the water filling port 2.

It can be understood that the labyrinth gas-liquid separation channel is a channel formed by the second bulge 20, the partition plate 12, the first bulge 13 and the water baffle 11 in sequence, when the self-priming pump just begins to work, water needs to be injected into the pump cavity 9 through the water filling port 2, water and air mixture in the pump cavity 9 enter the impeller, centrifugal force generated by the impeller can enable the mixture of water and gas to form high-speed fluid, the high-speed fluid enters the guide channel 22, then the high-speed fluid collides with the partition plate 12 and then collides with the first bulge 13 after being discharged from the guide vane outlet 21 through the collision of the second bulge 20, and the high-speed fluid collides with the water baffle 11 after being converged into the gas-liquid separation cavity 5. In the process, the gas-liquid mixture is subjected to four collision baffling steps, which is equivalent to a labyrinth, namely a labyrinth gas-liquid separation channel, and the gas flow rate is faster than that of the liquid, the gas speed is hardly affected, the liquid flow rate is greatly slowed down, and the gas-liquid mixture can be rapidly and effectively separated. The gas is discharged from the first outlet 3, and the water and the gas are continuously separated in a circulating way until the gas in the liquid inlet channel 6 and the pump cavity 9 is discharged completely, negative pressure is formed in the pump cavity 9, and self-priming is completed under the action of atmospheric pressure. It is worth to say that the gas-liquid mixture is impacted and baffled for many times, so that the gas-liquid separation efficiency is greatly improved, and the self-priming pump can rapidly complete self-priming. In addition, in this process, the gas-liquid mixture in the pump cavity 9 enters the liquid inlet channel 6 through the backflow inlet 16, so that negative pressure is formed in the liquid inlet channel 6, and liquid is facilitated to enter the liquid inlet channel 6 through the first liquid inlet 1.

The foregoing has outlined rather broadly the principles and embodiments of the present application in order that the detailed description of the invention may be better understood, and in order that the present application may be better understood. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.

Claims

1. The self-priming pump is characterized by comprising a pump body, wherein a pump cavity (9) and an impeller chamber are arranged in the pump body, the impeller chamber is provided with an impeller and a guide vane disc (4), the guide vane disc (4) is arranged outside the impeller, the guide vane disc (4) is provided with a plurality of guide vanes (17), two adjacent guide vanes (17) form a guide runner (22), a guide vane outlet (21) is arranged on the guide runner (22), and a labyrinth gas-liquid separation channel is arranged between the guide vane outlet (21) and the pump cavity (9); a liquid inlet channel (6) is arranged in the pump cavity (9), a backflow inlet (16) is arranged on the liquid inlet channel (6), and the pump cavity (9) is communicated with the liquid inlet channel (6) through the backflow inlet (16); a gas-liquid separation assembly is arranged in the pump cavity (9), the gas-liquid separation assembly comprises a water baffle (11), and the labyrinth gas-liquid separation channel is arranged between the guide vane outlet (21) and the water baffle (11); the gas-liquid separation assembly further comprises a baffle plate (12) and a surrounding plate (10), wherein the baffle plate (12) and the water baffle (11) are connected through the surrounding plate (10), and the baffle plate (12), the surrounding plate (10) and the water baffle (11) form a gas-liquid separation cavity (5); the guide vane outlet (21) on the guide vane disc (4) is opposite to the partition plate (12).

2. A self priming pump according to claim 1, wherein said diaphragm (12) is a disc.

3. A self-priming pump according to claim 2, characterized in that the partition (12) is provided with a first working hole (14), the water baffle (11) is provided with a second working hole (15), and the liquid inlet channel (6) passes through the first working hole (14) and the second working hole (15); the aperture of the first working hole (14) is larger than that of the second working hole (15).

4. A self priming pump according to claim 1, characterized in that the bottom part of the gas-liquid separation chamber (5) close to the pump chamber (9) is closed, a gap is arranged between the bottom of the gas-liquid separation chamber (5) and the bottom of the pump chamber (9), and the upper part of the gas-liquid separation chamber (5) close to the pump chamber (9) is provided with an opening.

5. The self-priming pump of claim 1, wherein the guide vane disc (4) is a disc, the size of the guide vane disc (4) is matched with the size of the partition plate (12), and the guide vane disc (4) is provided with a first mounting hole for mounting the impeller.

6. A self priming pump according to claim 5, characterized in that a plurality of first protrusions (13) are arranged between the partition plate (12) and the guide vane disc (4), and the plurality of first protrusions (13) are evenly distributed along the circumferential direction of the disc type.

7. A self priming pump according to claim 6, wherein the first protrusions (13) are strip-shaped protrusions, and the first protrusions (13) are arranged opposite to the guide vane disc (4).

8. A self priming pump according to claim 7, wherein the diaphragm (12) is fixedly connected to the first protrusion (13).

9. A self priming pump according to claim 7, characterized in that the vane disc (4) is fixedly connected to the first protrusion (13).

10. A self priming pump according to claim 1, characterized in that the flow guide channel (22) is provided with a bevel for letting liquid thrown by the impeller into the guide vane outlet (21) along the flow guide channel (22) and out of the guide vane outlet (21) more smoothly.

11. A self priming pump according to claim 10, wherein the inclined surface is provided on one side of the vane outlet (21) close to the impeller, and a second protrusion (20) is provided on the other side of the vane outlet (21).

12. A self priming pump according to claim 1, wherein one end of the liquid inlet channel (6) is provided with a first liquid inlet (1), the other end is provided with a first liquid outlet (8), the first liquid inlet (1) is arranged on the pump body, the impeller is provided with a second liquid inlet, and the second liquid inlet is communicated with the first liquid outlet (8).

13. A self priming pump according to claim 12, characterized in that the return inlet (16) is arranged below the inlet channel (6), the inlet channel (6) is provided with a projection (19) close to the first inlet (1), the projection (19) is used for preventing the liquid in the inlet channel (6) from overflowing from the first inlet (1), and the caliber of the return inlet (16) is smaller than the diameter of any part of the inlet channel (6).

14. A self priming pump according to claim 1, characterized in that the pump body is provided with a first outlet (3) and a water outlet (7), the first outlet (3) being arranged above the pump body, the first outlet (3) being for the discharge of liquid and gas, the water outlet (7) being for the discharge of liquid in the pump chamber (9), the water outlet (7) being arranged at the bottom of the pump body.

15. A self-priming pump according to claim 1, characterized in that the pump body is further provided with a water filling port (2), the water filling port (2) being in communication with the pump chamber (9).

16. The self-priming pump is characterized by comprising a pump body, wherein a pump cavity (9) and an impeller chamber are arranged in the pump body, the impeller chamber is provided with an impeller and a guide vane disc (4), the guide vane disc (4) is arranged outside the impeller, the guide vane disc (4) is provided with a plurality of guide vanes (17), two adjacent guide vanes (17) form a guide runner (22), a guide vane outlet (21) is arranged on the guide runner (22), and a labyrinth gas-liquid separation channel is arranged between the guide vane outlet (21) and the pump cavity (9); a liquid inlet channel (6) is arranged in the pump cavity (9), a backflow inlet (16) is arranged on the liquid inlet channel (6), and the pump cavity (9) is communicated with the liquid inlet channel (6) through the backflow inlet (16); a gas-liquid separation assembly is arranged in the pump cavity (9), the gas-liquid separation assembly comprises a water baffle (11), and the labyrinth gas-liquid separation channel is arranged between the guide vane outlet (21) and the water baffle (11); the gas-liquid separation assembly further comprises a baffle plate (12), the lower edge of the baffle plate (11) is attached to the bottom of the pump cavity (9), and the baffle plate (11), the baffle plate (12) and the bottom of the pump cavity (9) form a gas-liquid separation cavity (5); the guide vane outlet (21) on the guide vane disc (4) is opposite to the partition plate (12).

17. A self priming pump according to claim 16, wherein said diaphragm (12) is a disc.

18. A self priming pump according to claim 17, wherein the separator (12) is provided with a first working hole (14), the water baffle (11) is provided with a second working hole (15), and the liquid inlet channel (6) passes through the first working hole (14) and the second working hole (15); the aperture of the first working hole (14) is larger than that of the second working hole (15).

19. A self priming pump according to claim 16, wherein the bottom part of the gas-liquid separation chamber (5) close to the pump chamber (9) is closed, a gap is provided between the bottom of the gas-liquid separation chamber (5) and the bottom of the pump chamber (9), and the gas-liquid separation chamber (5) is provided with an opening close to the upper part of the pump chamber (9).

20. The self-priming pump of claim 16, wherein the guide vane disc (4) is a disc, the size of the guide vane disc (4) is matched with the size of the partition plate (12), and the guide vane disc (4) is provided with a first mounting hole for mounting the impeller.

21. A self priming pump according to claim 20, characterized in that a plurality of first protrusions (13) are arranged between the partition plate (12) and the guide vane disc (4), said first protrusions (13) being evenly distributed along the circumferential direction of the disc.

22. A self priming pump according to claim 21, wherein the first protrusions (13) are strip-shaped protrusions, the first protrusions (13) being arranged directly against the vane disc (4).

23. A self priming pump according to claim 22, wherein the diaphragm (12) is fixedly connected to said first protrusion (13).

24. A self priming pump according to claim 22, wherein the vane disc (4) is fixedly connected to the first protrusion (13).

25. A self priming pump according to claim 16, wherein the flow guide channel (22) is provided with a bevel for letting liquid thrown by the impeller into the guide vane outlet (21) along the flow guide channel (22) and out of the guide vane outlet (21) more smoothly.

26. A self priming pump according to claim 25, wherein said inclined surface is provided on one side of the vane outlet (21) close to the impeller, and a second protrusion (20) is provided on the other side of the vane outlet (21).

27. A self priming pump according to claim 16, wherein the inlet channel (6) is provided with a first inlet (1) at one end and a first outlet (8) at the other end, the first inlet (1) being provided on the pump body, the impeller being provided with a second inlet, the second inlet being in communication with the first outlet (8).

28. A self priming pump according to claim 27, wherein the return inlet (16) is arranged below the inlet channel (6), the inlet channel (6) is provided with a projection (19) close to the first inlet (1), the projection (19) is used for preventing the liquid in the inlet channel (6) from overflowing from the first inlet (1), and the aperture of the return inlet (16) is smaller than the diameter of any part of the inlet channel (6).

29. A self priming pump according to claim 16, characterized in that the pump body is provided with a first outlet (3) and a water outlet (7), the first outlet (3) being arranged above the pump body, the first outlet (3) being for the discharge of liquid and gas, the water outlet (7) being for the discharge of liquid in the pump chamber (9), the water outlet (7) being arranged at the bottom of the pump body.

30. A self priming pump according to claim 16, wherein the pump body is further provided with a filling port (2), the filling port (2) being in communication with the pump chamber (9).