Axial force self-balancing centrifugal pump

Abstract

The present invention relates to the technical field of centrifugal pumps, and specifically to an axial force self-balancing centrifugal pump, comprising a pump body and a motor, the pump body comprising a fixed shell, a first impeller, a second impeller and a drainage pipe, a housing chamber being provided inside the fixed shell, a water inlet and a water outlet being provided on the fixed shell, a first impeller being coaxially movably provided inside the housing chamber, a second impeller being coaxially movably provided inside the housing chamber, the second impeller being transmission-connected to the output shaft of the motor, the second impeller being capable of driving the first impeller to rotate, a drainage pipe being fixedly provided inside the housing chamber, one end of the drainage pipe being provided at the water inlet, and the other end of the drainage pipe being provided between the second impeller and the motor and facing the second impeller. The present invention ensures that the entire device will not suffer frictional loss due to the axial force caused by the water flow at any time during use, while also ensuring that the diverted portion of the water flow can be stably discharged from the water outlet, thereby increasing the service life of the entire device.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, in particular to an axial force self-balancing centrifugal pump. Background Art

[0002] Pumps, particularly centrifugal pumps, generate axial forces as the impeller rotates. The fundamental cause of this force is the unbalanced fluid forces acting on the front and rear shrouds of the centrifugal pump impeller. When the centrifugal pump is operating, the impeller drives the fluid. During this process, high-pressure fluid exiting the impeller leaks into the gaps between the front and rear shrouds, the pump body, and the pump cover. However, the front and rear shrouds of a centrifugal pump impeller have unequal pressure areas. The area inside the impeller rear shroud corresponding to the impeller suction port is at low pressure, while the area outside the rear shroud is at high pressure. This unequal pressure on the front and rear shrouds, coupled with the pressure differential across the area inside the impeller rear shroud corresponding to the impeller suction port, prevents the pressure differential between the front and rear shrouds from self-balancing, generating an axial force directed toward the impeller suction port. Currently, the commonly used balancing method involves installing thrust ball bearings or angular contact bearings on the pump shaft. These bearings must withstand both axial and radial forces, resulting in alternating loads in both directions. This can easily lead to bearing wear and failure, shortening their lifespan.

[0003] Chinese patent CN217652952U discloses a single-suction centrifugal pump with self-balancing axial force. The self-balancing of the impeller is achieved by introducing high-pressure water from the outer edge of the impeller water inlet side into the central part of the back of the impeller, thereby making the water pressure on the water inlet side and the back of the impeller equal, thereby achieving axial force balance of the pump shaft, and effectively avoiding the excessive wear caused by the pump shaft bearing needing to bear double loads. During use, this solution requires a certain amount of time for the movement of the water flow, which results in different times when the two sides of the impeller receive water pressure. During this time difference, the pump shaft bearing will still be affected by the axial force, causing the pump shaft bearing to be worn. This wear accumulated over time will cause the pump shaft bearing to be unable to continue working, resulting in the service life of the entire device still not being able to meet the current long-term working requirements. Summary of the Invention

[0004] In response to the above problems, an axial force self-balancing centrifugal pump is provided, which allows water to enter the accommodating chamber through a drainage pipe and be divided into two convection currents to offset the axial force. The presence of a gap between the first impeller and the second impeller prevents the first impeller and the second impeller from being squeezed against other parts before the axial forces between the two water flows offset each other.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0006] An axial force self-balancing centrifugal pump is provided, comprising a pump body and a motor. The pump body comprises a fixed shell, a first impeller, a second impeller, and a drainage pipe. A receiving chamber is defined within the fixed shell, and the receiving chamber is generally cylindrical. The output shaft of the motor is inserted into the receiving chamber and is coaxially arranged with the receiving chamber. A water inlet and a water outlet are defined on the fixed shell. The axis of the water inlet is coaxial with and communicates with the axis of the receiving chamber, and the axis of the water outlet is perpendicular to and communicates with the axis of the receiving chamber. The first impeller is coaxially movably disposed within the receiving chamber, the sliding direction of the first impeller is parallel to the axis of the receiving chamber, and the rotation axis of the first impeller is coaxial with the axis of the receiving chamber. The first impeller is disposed at a position away from the motor, and the second impeller is coaxially movably disposed within the receiving chamber, the sliding direction of the second impeller is parallel to the axis of the receiving chamber, the second impeller is transmission-connected to the output shaft of the motor, and the second impeller is disposed at a position close to the motor. The second impeller can drive the first impeller to rotate. The drainage pipe is fixedly disposed within the receiving chamber, one end of the drainage pipe is disposed at the water inlet, and the other end of the drainage pipe is disposed between the second impeller and the motor and faces the second impeller.

[0007] Preferably, a first fixed disk is coaxially fixed at both ends of the first impeller along the axial direction, and the center of a surface of the first impeller away from the second impeller is communicated with the outside world. A second fixed disk is coaxially fixed at both ends of the second impeller along the axial direction, and the center of a surface of the second impeller away from the first impeller is communicated with the outside world.

[0008] Preferably, a connecting groove is provided on the output shaft of the motor, and a first limiting strip that slides in cooperation with the connecting groove is fixedly provided on the second impeller at a position away from the first impeller, the length direction of the first limiting strip is parallel to the axis of the second impeller, and a fixed shaft extending toward the second impeller is coaxially fixed on the first impeller, and a second limiting strip is provided at the end of the fixed shaft, and a first fixing hole that slides in cooperation with the fixed shaft is provided on a side of the second impeller close to the first impeller, and a second fixing hole that can be clamped with the second limiting strip is provided inside the first fixing hole.

[0009] Preferably, the pump body also includes a first spring, both ends of the first spring are coaxially fixed with a fixing ring, the first impeller is provided with a first annular groove on the side close to the second impeller for coaxial sliding with the fixing ring, and the second impeller is provided with a second annular groove on the side close to the first impeller for coaxial sliding with the fixing ring.

[0010] Preferably, the second limit bar is slidably connected to the fixed shaft, the sliding direction of the second limit bar is parallel to the axis of the fixed shaft, a second spring is fixedly arranged between the second limit bar and the fixed shaft, and the axis of the second spring is parallel to the sliding direction of the second limit bar.

[0011] Preferably, a limiting bolt is fixedly provided on the fixed shaft, the axis of the limiting bolt is perpendicular to the axis of the fixed shaft, and a limiting groove is provided on the second limiting strip to cooperate with the sliding of the limiting bolt, and the length direction of the limiting groove is parallel to the sliding direction of the second limiting strip.

[0012] Preferably, the pump body also includes a third fixed plate, which is fixedly arranged between the motor and the second impeller, and the third fixed plate is movably matched with the output shaft of the motor. Two annular protrusions, one large and one small, are coaxially fixed on the third fixed plate. The drainage pipe is fixedly connected to the outer wall of the large annular protrusion, and the small annular protrusion and the second impeller form a temporary water storage chamber, and the water output by the drainage pipe can enter the temporary water storage chamber.

[0013] Preferably, the pump body further comprises a water inlet sleeve, which is coaxially fixed in the water inlet hole, a diversion baffle is fixedly provided at the center of the water inlet sleeve, and one end of the drainage pipe close to the water inlet hole is connected to the water inlet sleeve.

[0014] Preferably, the number of the drainage pipes is two, and all the drainage pipes are evenly arranged around the axis of the accommodating cavity.

[0015] Preferably, the drainage tube is made of flexible material.

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

[0017] The present invention uses a drainage pipe to realize the function of water flowing into the accommodating chamber and being divided into two convection currents to offset the axial force. The presence of a gap between the first impeller and the second impeller realizes the function of preventing the first impeller and the second impeller from being squeezed with other parts before the axial forces between the two water flows offset each other, thereby ensuring that the entire device will not cause friction loss due to the axial force caused by the water flow at any time during use. At the same time, it also ensures that the part of the water flow that is diverted can be stably discharged from the water outlet, thereby improving the service life of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an axial force self-balancing centrifugal pump;

[0019] Figure 2 This is a cross-sectional view of the pump body in an axial force self-balancing centrifugal pump. Figure 1 ;

[0020] Figure 3 yes Figure 2 A partial enlarged schematic diagram;

[0021] Figure 4 This is a cross-sectional view of the pump body in an axial force self-balancing centrifugal pump. Figure 2 ;

[0022] Figure 5 yes Figure 4 A partial enlarged schematic diagram of B in the middle;

[0023] Figure 6 This is a cross-sectional diagram of the pump body in an axial force self-balancing centrifugal pump. Figure 3 ;

[0024] Figure 7 yes Figure 6 A partial enlarged schematic diagram of center C;

[0025] Figure 8 This is a three-dimensional decomposition diagram of the pump body in an axial force self-balancing centrifugal pump Figure 1 ;

[0026] Figure 9 yes Figure 8 A partial enlarged schematic diagram of D in the middle;

[0027] Figure 10 This is a three-dimensional decomposition diagram of the pump body in an axial force self-balancing centrifugal pump Figure 2 .

[0028] The numbers in the figure are:

[0029] 1-Pump body;

[0030] 11-fixed shell; 111-accommodation cavity; 112-water inlet; 113-water outlet;

[0031] 12-first impeller; 121-first fixed disk; 122-fixed shaft; 123-second limiting strip; 124-first annular groove; 125-second spring; 126-limiting bolt; 127-limiting slide groove;

[0032] 13-second impeller; 131-second fixing plate; 132-first limiting strip; 133-first fixing hole; 134-second fixing hole;

[0033] 135-second annular groove;

[0034] 14-Drainage tube;

[0035] 15-first spring; 151-fixing ring;

[0036] 16-third fixed plate; 161-annular protrusion; 162-temporary water storage chamber;

[0037] 17-water inlet sleeve; 171-diverter baffle;

[0038] 2- Motor. DETAILED DESCRIPTION

[0039] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] See also Figure 1 、 Figure 2 、 Figure 4 and Figure 8 As shown, an axial force self-balancing centrifugal pump includes a pump body 1 and a motor 2. The pump body 1 includes a fixed shell 11, a first impeller 12, a second impeller 13 and a drainage pipe 14. The interior of the fixed shell 11 is provided with an accommodating chamber 111, and the accommodating chamber 111 is cylindrical as a whole. The output shaft of the motor 2 is inserted into the accommodating chamber 111 and is coaxially arranged with the accommodating chamber 111. A water inlet hole 112 and a water outlet hole 113 are provided on the fixed shell 11. The axis of the water inlet hole 112 is coaxial with and communicates with the axis of the accommodating chamber 111. The axis of the water outlet hole 113 is perpendicular to and communicates with the axis of the accommodating chamber 111. The first impeller 12 is coaxially movably arranged inside the accommodating chamber 111. The sliding direction of the first impeller 12 is perpendicular to the axis of the accommodating chamber 111. The axis of the first impeller 12 is parallel to that of the motor 2, the rotating axis of the first impeller 12 is coaxial with the axis of the accommodating chamber 111, the first impeller 12 is arranged at a position away from the motor 2, and the second impeller 13 is coaxially movably arranged inside the accommodating chamber 111, the sliding direction of the second impeller 13 is parallel to the axis of the accommodating chamber 111, the second impeller 13 is transmission-connected to the output shaft of the motor 2, the second impeller 13 is arranged at a position close to the motor 2, the second impeller 13 can drive the first impeller 12 to rotate, the drainage pipe 14 is fixedly arranged inside the accommodating chamber 111, one end of the drainage pipe 14 is arranged at the water inlet 112, and the other end of the drainage pipe 14 is arranged between the second impeller 13 and the motor 2 and toward the second impeller 13.

[0041] A water pipe is connected to the water inlet 112, and another water pipe is connected to the water outlet 113. Then the motor 2 is started, and the motor 2 drives the second impeller 13 to rotate. At this time, the rotation of the second impeller 13 will drive the first impeller 12 to rotate synchronously. The first impeller 12 will generate centrifugal force due to the rotation, and the centrifugal force will suck the water flow from the water inlet 112 into the accommodating chamber 111. During the movement, part of the water flow enters the drainage pipe 14, and the other part will first contact the first impeller 12, so that the first impeller 12 slides along its own axis toward the direction close to the first impeller 12, and because the water flow contacts the center of the first impeller 12 through centrifugal force and then pushes the first impeller 12 to move, part of the water flow entering the drainage pipe 14 will move to the outlet of the drainage pipe 14, thereby outputting the water flow to the center of the second impeller 13. At this time, the second impeller 13 will The body axis direction moves toward the direction close to the first impeller 12, so that the first impeller 12 and the second impeller 13 come into contact at the center of the accommodating chamber 111. At this time, the water flow entering from the water inlet hole 112 will pass through the first impeller 12 and the second impeller 13 respectively and move toward the water outlet hole 113 and then be discharged. Compared with the prior art, the drainage pipe 14 of the present invention allows the water flow entering the accommodating chamber 111 to be divided into two convection currents to offset the axial force. The gap between the first impeller 12 and the second impeller 13 prevents the first impeller 12 and the second impeller 13 from being squeezed with other parts before the axial forces between the two water flows offset each other, thereby ensuring that the entire device will not cause friction loss due to the axial force caused by the water flow at any time during use, and also ensures that part of the diverted water flow can be stably discharged from the water outlet hole 113, thereby improving the service life of the entire device.

[0042] See also Figure 8 and Figure 10 As shown: a first fixed disk 121 is coaxially fixedly provided at both ends of the first impeller 12 along the axial direction, and the center of a surface of the first impeller 12 away from the second impeller 13 is communicated with the outside world; a second fixed disk 131 is coaxially fixedly provided at both ends of the second impeller 13 along the axial direction, and the center of a surface of the second impeller 13 away from the first impeller 12 is communicated with the outside world.

[0043] The motor 2 drives the second impeller 13 and the first impeller 12 to rotate. Due to the centrifugal force generated by the rotation of the first impeller 12, water flows from the water inlet hole 112 into the interior of the accommodating chamber 111, and part of the water flow will again enter between the two first fixed disks 121 on the first impeller 12 under the action of centrifugal force, thereby being output along the diameter direction of the first impeller 12 under the action of the blades. After leaving the drainage pipe 14, the water flow also enters between the two second fixed disks 131 of the second impeller 13 under the action of the centrifugal force generated by the rotation of the second impeller 13, so that this part of the water flow will also move along the diameter direction of the second impeller 13. Compared with the prior art, the first fixed disk 121 and the second fixed disk 131 of the present invention limit the moving paths of the two water flows, thereby ensuring that the water flow entering the pump body 1 can be completely output to the outside of the pump body 1.

[0044] See also Figure 3 、 Figure 5 、 Figure 7 and Figure 9 As shown: a connecting groove is provided on the output shaft of the motor 2, and a first limiting strip 132 that slides with the connecting groove is fixedly provided at a position on the second impeller 13 away from the first impeller 12, and the length direction of the first limiting strip 132 is parallel to the axis of the second impeller 13, and a fixed shaft 122 extending toward the second impeller 13 is coaxially fixed on the first impeller 12, and a second limiting strip 123 is provided at the end of the fixed shaft 122, and a first fixing hole 133 that slides with the fixed shaft 122 is provided on a side of the second impeller 13 close to the first impeller 12, and a second fixing hole 134 that can be clamped with the second limiting strip 123 is provided inside the first fixing hole 133.

[0045] When the motor 2 is working, the output shaft will rotate. At this time, the first limiting strip 132 is clamped in the connecting slot, and the second impeller 13 will rotate along with the rotation of the output shaft. At this time, since the second limiting hole is inserted into the second fixing hole 134, the first impeller 12 will rotate along with the rotation of the second impeller 13. At this time, the rotation of the first impeller 12 generates centrifugal force to suck water from the water inlet hole 112. Part of the water flow contacts the first impeller 12, thereby generating axial force to push the first impeller 12 to move in the direction close to the second impeller 13, and the other part of the water flow will pass through The water moves through the drainage pipe 14 to the side of the second impeller 13 away from the first impeller 12. The centrifugal force generated by the rotation of the second impeller 13 will attract the water flow to the second impeller 13, thereby causing the second impeller 13 to move toward the direction close to the first impeller 12. Compared with the prior art, the connecting groove, the first limiting bar 132, the second limiting bar 123 and the second fixing hole 134 of the present invention cooperate to ensure that the first impeller 12 and the second impeller 13 still maintain a transmission connection when they rotate, thereby ensuring that the water flow can be stably sucked in from the water inlet 112 and discharged from the water outlet 113.

[0046] See also Figures 2 to 8 As shown: the pump body 1 also includes a first spring 15, and both ends of the first spring 15 are coaxially fixed with a fixing ring 151. A first annular groove 124 is provided on the side of the first impeller 12 close to the second impeller 13, and the fixing ring 151 slides coaxially with the first annular groove 135 is provided on the side of the second impeller 13 close to the first impeller 12, and the fixing ring 151 slides coaxially with the second annular groove 135 is provided.

[0047] When the motor 2 is working and before the water flows into the accommodating chamber 111, the first spring 15 is in a normal state, the first impeller 12 and the second impeller 13 move away from each other, and the second impeller 13 drives the first impeller 12 to rotate as the motor 2 works. When the motor 2 works and the water flows into the accommodating chamber 111, the first spring 15 will be continuously compressed to provide elastic force to the first impeller 12 and the second impeller 13. The first impeller 12 and the second impeller 13 will move slowly under the elastic force provided by the first spring 15 to avoid collision. When the motor 2 stops working, the first spring 15 will release the compression state and provide elastic force to make the first impeller 12 and the second impeller 13 move away from each other, and the first impeller 12 and the second impeller 13 move to the initial position. Compared with the prior art, the first spring 15 of the present invention is located between the first impeller 12 and the second impeller 13 to provide elastic force to the first impeller 12 and the second impeller 13, thereby preventing the first impeller 12 and the second impeller 13 from approaching each other and colliding under the action of axial force.

[0048] See also Figures 2 to 7As shown: the second limit bar 123 is slidably connected to the fixed shaft 122, the sliding direction of the second limit bar 123 is parallel to the axis of the fixed shaft 122, and a second spring 125 is fixedly arranged between the second limit bar 123 and the fixed shaft 122, and the axis of the second spring 125 is parallel to the sliding direction of the second limit bar 123.

[0049] When the motor 2 is not working, the second spring 125 is in a slightly compressed state, most of the second limit strip 123 is outside the fixed shaft 122, and the second limit strip 123 is inserted into the second fixing hole 134. The first impeller 12 will follow the rotation of the second impeller 13 and rotate. When the motor 2 is working and the water flows into the accommodating chamber 111, the distance between the second impeller 13 and the first impeller 12 continues to decrease, and the second limit strip 123 will continue to shrink to the inside of the fixed shaft 122. The second spring 125 is continuously compressed to provide elastic force so that the second limit strip 123 can still be inserted into the second fixing hole 134. At this time, the first impeller 12 can still follow the rotation of the second impeller 13 and rotate. Compared with the prior art, the second spring 125 of the present invention provides elastic force to push the second limit strip 123 to be inserted into the second fixing hole 134, thereby ensuring that the transmission connection between the second impeller 13 and the first impeller 12 can remain stable.

[0050] See also Figures 2 to 9 As shown: a limiting bolt 126 is fixedly provided on the fixed shaft 122, the axis of the limiting bolt 126 is perpendicular to the axis of the fixed shaft 122, and a limiting groove 127 is provided on the second limiting bar 123 to cooperate with the sliding of the limiting bolt 126, and the length direction of the limiting groove 127 is parallel to the sliding direction of the second limiting bar 123.

[0051] When repairing the pump body 1, the fixed shell 11 is disassembled, and then the first impeller 12 is removed from the second impeller 13. At this time, the second spring 125, which is in a slightly compressed state, will release the compression state, and the second limit bar 123 will have no constraints outside the end away from the first impeller 12. The elastic force provided by the second spring 125 will enable the second limit bar 123 to move relative to the first impeller 12. After the second limit bar 123 moves a certain distance, the limiting bolt 126 contacts the end of the limiting slot 127, so that the second limit bar 123 stops moving. Compared with the prior art, the limiting bolt 126 and the limiting slot 127 of the present invention limit the movement range of the second limit bar 123, thereby preventing the second limit bar 123 from being disconnected from the first impeller 12 when the pump body 1 is disassembled.

[0052] See also Figure 2 、 Figure 4 、 Figure 8 and Figure 10As shown: the pump body 1 also includes a third fixed disk 16, which is fixedly arranged between the motor 2 and the second impeller 13. The third fixed disk 16 is movably matched with the output shaft of the motor 2. Two annular protrusions 161, one large and one small, are coaxially fixed on the third fixed disk 16. The drainage pipe 14 is fixedly connected to the outer wall of the large annular protrusion 161, and the small annular protrusion 161 and the second impeller 13 form a temporary water storage chamber 162. The water output by the drainage pipe 14 can enter the temporary water storage chamber 162.

[0053] The motor 2 drives the second impeller 13 and the first impeller 12 to rotate simultaneously. Due to the centrifugal force generated by the rotation of the first impeller 12, a part of the water flow entering from the water inlet 112 enters the back of the first impeller 12. Due to the centrifugal force generated by the rotation of the first impeller 12, another part of the water flow entering from the water inlet 112 enters the drainage pipe 14. At this time, this part of the water flow leaves the drainage pipe 14 and enters the temporary water storage chamber 162, so that this part of the water flow is concentrated together. At this time, the centrifugal force generated by the rotation of the second impeller 13 will cause the water flow inside the temporary water storage chamber 162 to enter between the two second fixed disks 131. Compared with the prior art, the third fixed disk 16 of the present invention makes the water flow output from the drainage pipe 14 concentrated together, thereby facilitating the centrifugal force generated by the rotation of the second impeller 13 to attract this part of the water flow.

[0054] See also Figure 4-Figure 5 、 Figure 8 and Figure 10 As shown: the pump body 1 also includes a water inlet sleeve 17, which is coaxially fixed in the water inlet hole 112, and a diverter baffle 171 is fixedly provided at the center of the water inlet sleeve 17, and one end of the drainage pipe 14 close to the water inlet hole 112 is connected to the water inlet sleeve 17.

[0055] The centrifugal force generated by the rotation of the first impeller 12 will cause water to flow in from the water inlet 112, and then this part of the water flow will be divided into two parts under the operation of the diverter baffle 171. One part continues to move and enters the interior of the first impeller 12 under the action of the centrifugal force generated by the rotation of the first impeller 12 and is discharged, and the other part will enter the dying water storage chamber through the drainage pipe 14, and then this part of the water flow enters the second impeller 13 under the action of the centrifugal force generated by the rotation of the second impeller 13 and is discharged. Compared with the prior art, the water inlet sleeve 17 of the present invention makes the water flow passing through the water inlet hole 112 evenly divided into two parts, so that the axial force exerted on the first impeller 12 and the second impeller 13 always remains the same.

[0056] See also Figure 2 、 Figure 4 、 Figure 6 、 Figure 8 and Figure 10As shown, there are two drainage pipes 14 , and all the drainage pipes 14 are evenly arranged around the axis of the accommodating cavity 111 .

[0057] Due to the centrifugal force generated by the rotation of the first impeller 12, water will be continuously sucked in from the water inlet hole 112. These water flows enter the water inlet sleeve 17 and are diverted by the diverter baffle 171. Part of the water flow diverted by the diverter baffle 171 will be continuously input into the interior of the temporary water storage chamber 162 along the two drainage pipes 14. The second impeller 13 rotates to generate centrifugal force so that this part of the water flow enters the interior of the second impeller 13. Compared with the prior art, the drainage pipes 14 of the present invention are provided with two and are evenly distributed, thereby preventing the water flow from being blocked and causing backflow when entering the drainage pipe 14.

[0058] See also Figure 8 and Figure 10 As shown: the drainage tube 14 is made of flexible material.

[0059] A groove for placing the drainage pipe 14 is provided on the inner wall of the fixed shell 11. During installation, the drainage pipe 14 is placed in the groove and pressed. The drainage pipe 14 will fully fit with the groove left on the inner wall of the accommodating chamber 111, so that the diameter of the cylindrical cavity formed by the accommodating chamber 111 is the same as the diameter of the first impeller 12. Compared with the prior art, the drainage pipe 14 of the present invention is set to a flexible material, so that the drainage pipe 14 can fully fit and avoid the appearance of unnecessary grooves.

[0060] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An axial force self-balancing centrifugal pump, comprising a pump body (1) and a motor (2), characterized in that: The pump body (1) comprises a fixed shell (11), a first impeller (12), a second impeller (13) and a drainage pipe (14); An accommodating chamber (111) is provided inside the fixed shell (11), and the accommodating chamber (111) is cylindrical in shape as a whole. The output shaft of the motor (2) is inserted into the accommodating chamber (111) and is coaxially arranged with the accommodating chamber (111). A water inlet (112) and a water outlet (113) are provided on the fixed shell (11), and the axis of the water inlet (112) is coaxial with and communicates with the axis of the accommodating chamber (111), and the axis of the water outlet (113) is perpendicular to and communicates with the axis of the accommodating chamber (111). The first impeller (12) is coaxially movably arranged inside the accommodating chamber (111), the sliding direction of the first impeller (12) is parallel to the axis of the accommodating chamber (111), the rotation axis of the first impeller (12) is coaxial with the axis of the accommodating chamber (111), and the first impeller (12) is arranged at a position away from the motor (2); The second impeller (13) is coaxially movably arranged inside the accommodating chamber (111), the sliding direction of the second impeller (13) is parallel to the axis of the accommodating chamber (111), the second impeller (13) is drivingly connected to the output shaft of the motor (2), the second impeller (13) is arranged at a position close to the motor (2), and the second impeller (13) can drive the first impeller (12) to rotate; The drainage pipe (14) is fixedly arranged inside the accommodating chamber (111), one end of the drainage pipe (14) is arranged at the water inlet hole (112), and the other end of the drainage pipe (14) is arranged between the second impeller (13) and the motor (2) and faces the second impeller (13); A first fixed disk (121) is coaxially fixedly provided at both ends of the first impeller (12) along the axial direction, and the center of a surface of the first impeller (12) away from the second impeller (13) is communicated with the outside world; a second fixed disk (131) is coaxially fixedly provided at both ends of the second impeller (13) along the axial direction, and the center of a surface of the second impeller (13) away from the first impeller (12) is communicated with the outside world; A connecting groove is provided on the output shaft of the motor (2); a first limiting strip (132) is fixedly provided on the second impeller (13) at a position away from the first impeller (12) and is slidably matched with the connecting groove; the length direction of the first limiting strip (132) is parallel to the axis of the second impeller (13); a fixed shaft (122) extending toward the second impeller (13) is coaxially fixedly provided on the first impeller (12); a second limiting strip (123) is provided at the end of the fixed shaft (122); a first fixing hole (133) is provided on a side of the second impeller (13) close to the first impeller (12) and is slidably matched with the fixed shaft (122); a second fixing hole (134) capable of engaging the second limiting strip (123) is provided inside the first fixing hole (133).

2. The axial force self-balancing centrifugal pump according to claim 1, characterized in that: The pump body (1) further includes a first spring (15); A fixing ring (151) is coaxially fixedly provided at both ends of the first spring (15); a first annular groove (124) coaxially slidingly cooperating with the fixing ring (151) is provided on a side of the first impeller (12) close to the second impeller (13); and a second annular groove (135) coaxially slidingly cooperating with the fixing ring (151) is provided on a side of the second impeller (13) close to the first impeller (12).

3. The axial force self-balancing centrifugal pump according to claim 2, characterized in that: The second limiting strip (123) is slidably connected to the fixed shaft (122), the sliding direction of the second limiting strip (123) is parallel to the axis of the fixed shaft (122), a second spring (125) is fixedly arranged between the second limiting strip (123) and the fixed shaft (122), and the axis of the second spring (125) is parallel to the sliding direction of the second limiting strip (123).

4. The axial force self-balancing centrifugal pump according to claim 3, characterized in that: A limiting bolt (126) is fixedly provided on the fixed shaft (122), and the axis of the limiting bolt (126) is perpendicular to the axis of the fixed shaft (122). A limiting sliding groove (127) is provided on the second limiting strip (123) for sliding with the limiting bolt (126), and the length direction of the limiting sliding groove (127) is parallel to the sliding direction of the second limiting strip (123).

5. The axial force self-balancing centrifugal pump according to claim 4, characterized in that: The pump body (1) further includes a third fixed disc (16); The third fixed disk (16) is fixedly arranged between the motor (2) and the second impeller (13), and the third fixed disk (16) is movably matched with the output shaft of the motor (2). Two annular protrusions (161), one large and one small, are coaxially fixedly arranged on the third fixed disk (16). The drainage pipe (14) is fixedly connected to the outer wall of the large annular protrusion (161), and the small annular protrusion (161) and the second impeller (13) form a temporary water storage chamber (162). Water output from the drainage pipe (14) can enter the temporary water storage chamber (162).

6. The axial force self-balancing centrifugal pump according to claim 5, characterized in that: The pump body (1) further comprises a water inlet sleeve (17); The water inlet sleeve (17) is coaxially fixedly arranged in the water inlet hole (112), a diversion baffle (171) is fixedly arranged at the center of the water inlet sleeve (17), and one end of the drainage pipe (14) close to the water inlet hole (112) is connected to the water inlet sleeve (17).

7. The axial force self-balancing centrifugal pump according to claim 6, characterized in that: There are two drainage pipes (14), and all the drainage pipes (14) are evenly arranged around the axis of the accommodating cavity (111).

8. The axial force self-balancing centrifugal pump according to claim 7, characterized in that: The two drainage pipes (14) are made of flexible material.

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