Pump device

Abstract

The invention discloses a pump device which comprises a pump body, a cover body and a pump shaft, the pump body is provided with a containing cavity, the pump device is provided with a stator and a rotor, the stator and the rotor are located in the containing cavity, the pump device is provided with a backflow channel, and at least part of the backflow channel is located in the pump shaft. The backflow channel is communicated with the containing cavity and a flow inlet of the pump device or the backflow channel is communicated with the containing cavity and a flow outlet of the pump device; the pump device is provided with a flow aiding piece, at least part of the flow aiding piece is located in the pump shaft, and the backflow channel is located between the flow aiding piece and the inner wall of the pump shaft. And or, a spiral flow guide groove is formed in the pump shaft, and the backflow channel comprises the spiral flow guide groove. According to the pump device, through the flow aiding piece or the spiral flow guide groove, a medium flow channel in the containing cavity is achieved, and the cooling effect on components in the pump body is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a pump device. Background Art

[0002] Pump devices are widely used in production and life, and are mainly used to transport liquid media. In the related art, the stator, rotor and other internal components of the pump device are easily heated after long-term operation, thereby affecting the performance of the pump device. How to cool the stator, rotor and other internal components in the inner cavity of the pump device is a technical issue that needs to be considered. Summary of the invention

[0003] The purpose of the present invention is to at least solve the problems in the background technology and to provide a pump device.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A pump device, comprising a pump body, a cover body, and a pump shaft, wherein the pump body has a receiving cavity, the pump device has a stator and a rotor, the stator and the rotor are located in the receiving cavity, the stator is located at least partially around the rotor, the rotor is connected to the pump shaft, the pump device has a reflux channel, at least part of the reflux channel is located inside the pump shaft, the reflux channel connects the receiving cavity with an inlet of the pump device, or the reflux channel connects the receiving cavity with an outlet of the pump device;

[0006] The pump device has a flow-aiding member, at least part of which is located inside the pump shaft, and the reflux channel is located between the flow-aiding member and the inner wall of the pump shaft; and\or, a spiral guide groove is provided inside the pump shaft, and the reflux channel includes the spiral guide groove.

[0007] In the pump device of the above technical solution, the medium enters the accommodating chamber of the pump device, and the medium in the accommodating chamber flows to the inlet or outlet of the pump device through the reflux channel under the action of the flow-aiding member, or the medium in the accommodating chamber flows to the inlet or outlet of the pump device under the action of the spiral guide groove, thereby realizing the fluidity of the medium in the accommodating chamber, having a cooling effect on the internal components such as the stator and rotor in the accommodating chamber, and reducing the probability of affecting their performance due to temperature increase.

[0008] The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0010] Figure 1is a schematic cross-sectional structural diagram of a pump device according to an embodiment;

[0011] Figure 2 A schematic diagram of the explosion structure of a pump device according to an embodiment;

[0012] Figure 3 A schematic diagram of a spiral blade installation structure in an embodiment;

[0013] Figure 4 A schematic diagram of a spiral blade and a rotating shaft structure in an embodiment;

[0014] Figure 5 A schematic diagram of the structure of an outer rotating wheel and an inner rotating wheel in an embodiment;

[0015] Figure 6 This is a schematic structural diagram of a cover body according to an embodiment;

[0016] Figure 7 is a structural schematic diagram showing another viewing angle of the cover body in an embodiment;

[0017] Figure 8 is a schematic structural diagram of a pump body of an embodiment;

[0018] Fig. 9 is a structural schematic diagram showing another perspective of the pump body in an embodiment;

[0019] Fig.10 is a schematic diagram of the structure of a spiral guide groove in an embodiment;

[0020] Fig.11 is a schematic diagram of a structure in which a rotating shaft is fixed to a bottom end shell of a pump body in an embodiment;

[0021] Fig.12 is a schematic diagram of a connecting rib structure in an embodiment;

[0022] Fig.13 The diagram is a schematic diagram showing the second end cover structure in an embodiment.

[0023] Fig.14 The present invention is a schematic structural diagram showing an embodiment in which a reflux channel connects the accommodating chamber and the outlet of the pump device.

[0024] Reference numerals:

[0025] 1. Pump body, 2. Cover body, 21. Inlet, 22. Second axial hole, 23. Outlet, 24. Transition chamber, 241. Arc flow channel, 242. Outlet flow channel, 25. Annular wall, 26. Annular groove, 27. Sealing ring, 3. Pump shaft, 31. Reflux channel, 32. Inlet, 4. Outer rotating wheel, 5. Inner rotating wheel, 6. Suction area, 7. Pressure flow area, 8. Accommodating chamber, 9. Spiral blades, 10. Blocking platform, 101. First axial hole, 102. Blocking wall, 103. Through port, 104. Limiting cylinder, 11. Rotating shaft, 12. First end cover, 13. Connecting ribs, 14. Spiral guide groove, 15. Bottom shell, 16. Second end cover, 17. Liquid outlet, 18. Stator, 19. Rotor, 20. Flow channel. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] like Figure 1-Figure 14 As shown, a pump device of this embodiment includes a pump body 1, a cover body 2, and a pump shaft 3. The pump body 1 has a accommodating chamber 8. The pump device has a stator 18 and a rotor 19. The stator 18 and the rotor 19 are located in the accommodating chamber 8. The stator 18 is located at least partially on the periphery of the rotor 19. The stator 18 is connected to the side wall of the pump device. The rotor 19 is connected to the pump shaft 3. The pump device has a reflux channel 31. At least part of the reflux channel 31 is located inside the pump shaft 3. The reflux channel 31 connects the accommodating chamber 8 with the inlet 21 of the pump device, or the reflux channel 31 connects the accommodating chamber 8 with the outlet 23 of the pump device.

[0028] The pump device has a flow-assisting member, at least part of which is located inside the pump shaft 3 , and the reflux channel is located between the flow-assisting member and the inner wall of the pump shaft 3 .

[0029] Furthermore, the pump body 1 is provided with an outer rotating wheel 4 and an inner rotating wheel 5, the outer rotating wheel 4 has internal meshing teeth, the inner rotating wheel 5 has external meshing teeth matching the internal meshing teeth, the inner rotating wheel 5 is connected to the pump shaft 3, the outer rotating wheel 4 and the inner rotating wheel 5 are eccentrically arranged, a suction area 6 and a pressure area 7 are provided between the internal meshing teeth and the external meshing teeth, the accommodating chamber 8 is connected to the suction area 6, the reflux channel 31 connects the accommodating chamber 8 and the inlet 21 of the pump device, and the inlet 21 is also connected to the suction area 6.

[0030] In one embodiment, one end of the reflux channel 31 is connected to the accommodating chamber 8, and the other end of the reflux channel 31 is connected to the inlet 21 of the pump device. The reflux channel 31 is provided with a spiral blade 8, and the spiral blade 8 is fixedly connected to the pump shaft 3. The bottom or middle part of the reflux channel 31 is connected to the accommodating chamber 8, and after the accommodating chamber 8 is filled with a certain volume of medium, it enters the reflux channel 31 and flows to the inlet 21, and part of the medium in the inlet 21 can flow into the accommodating chamber 8 through the suction area 6, and then form a medium circulation in the accommodating chamber 8, thereby cooling the stator 18 and the rotor 19 in the accommodating chamber 8.

[0031] Furthermore, the interior of the pump shaft 3 is arranged to be hollow, thereby forming a reflux channel 31 to facilitate the arrangement of the flow-aiding member.

[0032] In one embodiment, the medium flowing through the pump device is oil, and the pump device is used as an oil pump; of course, the medium flowing through the pump device can also be other liquids or other media that meet the conditions. The pump device is provided with a control board. When the medium is oil, the control board can be located in the accommodating chamber 8. The oil enters the accommodating chamber 8 and can flow through the control board, the stator 18, and the rotor 19, and then the control board, the stator 18, and the rotor 19 are cooled.

[0033] In one embodiment, Figure 5 As shown, there are always multiple meshing points between the outer rotating wheel 4 and the inner rotating wheel 5, and a suction flow area 6 and a pressure flow area 7 are formed. The suction flow area 6 and the pressure flow area 7 are divided by the meshing points, so the suction flow area 6 and the pressure flow area 7 are not connected to each other between the outer rotating wheel 4 and the inner rotating wheel 5. Since the outer rotating wheel 4 and the inner rotating wheel 5 are eccentrically arranged, when the pump shaft 3 drives the inner rotating wheel 5 to rotate, the spatial volume of the suction flow area 6 increases and the pressure of the suction flow area 6 decreases, so the medium outside the pump device is sucked into the suction flow area 6, and as the inner rotating wheel 5 rotates, part of the medium in the suction flow area 6 rotates to the pressure flow area 7, while the spatial volume of the pressure flow area 7 decreases, the pressure of the pressure flow area 7 increases, and the medium is discharged from the pump device again.

[0034] It is understandable that the suction area 6 is connected to the accommodating chamber 8 of the pump body 1. During the operation of the pump device, most of the medium will still be transferred from the suction area 6 to the pressure area 7 and discharged, while a part of the medium will enter the accommodating chamber 8 from the suction area 6, gradually fill the accommodating chamber 8, and then enter the reflux channel 31 of the pump shaft 3, and then flow back from the reflux channel 31 to the inlet 21, thereby forming a medium circulation in the accommodating chamber 8 in the pump body 1, which has a good cooling effect on the internal parts of the accommodating chamber 8 in the pump body 1, reducing the probability of affecting its service life due to temperature increase. Figure 1 As shown, in order to distinguish the flow channels of the two media, Figure 1The arrows of different thicknesses are marked in the figure. The thicker arrows point to the path where most of the medium is directly transferred from the suction flow area 6 to the pressure flow area 7 and ejected, and the thinner arrows point to the path where the medium flows through the accommodating chamber 8 and flows out from the reflux channel 31 to the inlet 21.

[0035] The pump device has a medium channel, which includes a first flow path and a second flow path. The first flow path includes an inlet 21, a suction area 6, a pressure area 7, and an outlet 23. The second flow path includes an inlet 21, a suction area 6, a receiving chamber 8, and a reflux channel 31. Figure 1 As shown, the first flow path is the path pointed by the thicker arrow, and the second flow path is the path pointed by the thinner arrow.

[0036] In one embodiment, the number of teeth of the inner rotating wheel 5 is one less than that of the outer rotating wheel 4, the inner rotating wheel 5 and the outer rotating wheel 4 are eccentrically arranged, and the inner rotating wheel 5 always has a meshing point with the outer rotating wheel 4, so the suction flow area 6 and the pressure flow area 7 between the inner rotating wheel 5 and the outer rotating wheel 4 will not be connected and affect each other. The medium in the suction flow area 6 moves to the pressure flow area 7 under the rotation of the pump shaft 3, and then is discharged under the action of the volume change of the pressure flow area 7. When one tooth of the inner rotating wheel 5 is fully meshed with one tooth of the outer rotating wheel 4, that is, the medium in the pressure flow area 7 is basically discharged, and a suction flow and pressure flow cycle is completed at this time. The pump shaft 3 continues to rotate, and one tooth of the inner rotating wheel 5 and one tooth of the outer rotating wheel 4 are meshed and then disengaged, and then the suction flow stage is entered again. In other embodiments, the number of teeth of the inner rotating wheel 5 can also be two or more less than that of the outer rotating wheel 4. The principle is the same and will not be repeated.

[0037] In one embodiment, the inlet 21 and the outlet 23 of the pump device are both arranged on the cover body 2, and the pump device is placed vertically or tilted with the inlet on top. At this time, the inlet 21 is located above the accommodating chamber 8, and the external medium enters the suction area 6 under the suction force of the suction area 6 and the medium's own gravity. Most of the medium is brought into the pressure flow area 7 under the cooperation of the outer rotating wheel 4 and the inner rotating wheel 5, and a part of the medium enters and fills the accommodating chamber 8 under its own gravity, and then enters the reflux channel 31; and the spiral blade 8 located in the reflux channel 31 is fixedly connected to the pump shaft 3, so the spiral blade 8 rotates synchronously with the pump shaft 3, and then can drive the medium in the reflux channel 31 to flow upward to the inlet 21, thereby realizing the medium circulation of the accommodating chamber 8, and achieving the cooling effect of the components in the accommodating chamber 8. It can be understood that the components in the accommodating chamber 8 include the stator 18, the rotor 19, the pump shaft 3 fixedly connected to the rotor 19, the circuit board and other components, and the bottom end or the top end of the spiral blade 8 can be fixedly welded to the pump shaft 3 through a connecting strip.

[0038] like Figure 3As shown, by opening a reflux channel 31 on the pump shaft 3 and setting the spiral blade 8 fixedly connected to the pump shaft 3 in the reflux channel 31, the original structure of the pump device is well utilized, and the medium in the accommodating chamber 8 is brought to the inlet 21 by utilizing the characteristics of the pump shaft 3 and the spiral blade 8, and the medium in the inlet 21 flows through the suction area 6, and then partially flows into the accommodating chamber 8, so as to circulate the medium. Specifically, an inlet 32 ​​is provided at the lower end of the pump shaft 3, and the reflux channel 31 is connected to the accommodating chamber 8 through the inlet 32; the inlet 32 ​​can be set to multiple or one.

[0039] In one embodiment, Figure 4 As shown, the pump shaft 3 is provided with a rotating shaft 11 , the rotating shaft 11 is located in the reflux channel 31 , the spiral blades 8 are spirally provided on the outer surface of the rotating shaft 11 , and the spiral blades 8 are fixedly connected to the pump shaft 3 through the rotating shaft 11 .

[0040] The spiral blade 8 is fixed to the rotating shaft 11 and forms a screw-like structure, or a corresponding screw can be directly used (in this case, the spiral blade 8 and the rotating shaft 11 are an integrated structure). The lower end of the rotating shaft 11 is provided with a first end cover 12, and the first end cover 12 is welded and fixed to the lower end of the pump shaft 3 and blocks the lower end of the reflux channel 31, so that the rotating shaft 11 can rotate synchronously with the pump shaft 3, and then the spiral blade 8 rotates synchronously with the pump shaft 3. The first end cover 12 blocks the lower end of the reflux channel 31, so that the medium has a certain storage capacity after entering the reflux channel 31, increasing the efficiency of the medium being driven by the spiral blade 8 to flow upward. Of course, in other embodiments, the end of the rotating shaft can also be welded and fixed to the pump shaft 3 through the connecting rib 13.

[0041] In one embodiment, Fig.13 As shown, the upper end of the rotating shaft 11 is provided with a second end cover 16, and the second end cover 16 is welded and fixed to the upper end of the pump shaft 3. The rotating shaft 11 is fixedly connected to the pump shaft 3 through the second end cover 16. The side wall of the upper end of the pump shaft 3 is provided with a liquid outlet 17, and the reflux channel 31 is connected with the inlet 21 through the liquid outlet 17.

[0042] In one embodiment, Fig.12 As shown, the upper end or the lower end of the rotating shaft 11 is welded and fixed to the pump shaft 3 through the connecting rib 13, and the connecting rib 13 is in an arc shape. The connecting rib 13 can fix the rotating shaft 11 and the pump shaft 3. The connecting rib 13 cooperates with the first end cover 12 to fix both ends of the rotating shaft 11 to the pump shaft 3, thereby increasing the stability of the rotating shaft 11 and the pump shaft 3 and reducing the probability of the rotating shaft 11 shaking. Specifically, the arc bending direction of the connecting rib 13 is in the same direction as the spiral flow direction of the medium, thereby reducing the flow resistance of the connecting rib 13 to the medium, and increasing the stability of the rotating shaft 11 and the pump shaft while maintaining the reflux efficiency of the medium as much as possible.

[0043] In one embodiment, Fig.11 As shown, the rotating shaft 11 and the pump shaft 3 can also rotate relative to each other. Specifically, the lower end of the rotating shaft 11 extends out of the pump shaft 3, and the lower end of the rotating shaft 11 is fixedly connected to the bottom housing 15 of the pump device by welding or other methods. The rotating shaft 11 will not be driven during the rotation of the pump shaft 3, but the medium can rotate with the rotating shaft 11, and the rotating medium can flow upward along the spiral blades, and then flow back to the inlet 21 to realize the circulation of the medium in the accommodating chamber 8.

[0044] In one embodiment, Fig.10 As shown, the pump device has a flow-aiding member, at least part of which is located inside the pump shaft 3, and the reflux channel 31 is located between the flow-aiding member and the inner wall of the pump shaft 3; and\or, a spiral guide groove is provided inside the pump shaft 3, and the reflux channel 31 includes the spiral guide groove.

[0045] Specifically, a spiral guide groove 14 is provided inside the pump shaft 3, the reflux channel 31 includes the spiral guide groove 14, the flow-aiding member is a spiral blade 9, and the spiral direction of the spiral guide groove 14 is the same as the spiral direction of the spiral blade 9. On the one hand, part of the medium entering the spiral guide groove 14 can move upward under the drive of the spiral guide groove 14; on the other hand, the spiral guide groove 14, as a temporary storage groove, can temporarily store part of the medium flowing out from the edge of the spiral blade 8, thereby reducing the amount of medium flowing downward between the spiral blade 8 and the side wall corresponding to the reflux channel 31. Specifically, the medium flows into the spiral guide groove 14 and contacts or collides with its inner wall, and part of the medium will flow back from the spiral guide groove 14, and under the action of flow inertia, it will flow to the spiral blade 8 on the lower side, and the spiral blade 8 will continue to push the medium upward, thereby increasing the efficiency of the medium moving upward. Of course, in other embodiments, the spiral blade and the spiral guide groove 14 can also be set selectively. Of course, the flow-aiding member can also be configured as a rotating shaft 11 having spiral blades 9. The spiral blades 9 and the rotating shaft 11 can be integrally formed or fixed by welding or other methods.

[0046] In one embodiment, Figure 2 , 6 As shown in , 7 , the cover body 2 is provided with a second axial hole 22 , the upper end of the pump shaft 3 is inserted into the second axial hole 22 , the inlet 21 is provided on the cover body 2 , the inlet 21 is located on one side of the second axial hole 22 , the inlet 21 passes through the cover body 2 and is opposite to the suction area 6 .

[0047] In one embodiment, the upper end of the pump shaft 3 extends out of the second shaft hole 22, and the medium flows out from the reflux channel 31. At this time, the outflowing medium diffuses and flows around, and can flow into the inlet 21. Alternatively, the upper end of the pump shaft 3 may not extend out of the second shaft hole 22, and the medium flows out of the reflux channel 31 and then flows through the second shaft hole 22, and then can flow into the inlet 21.

[0048] In one embodiment, the side wall corresponding to the second shaft hole 22 and the upper end of the pump shaft 3 are gap-matched, and the side wall corresponding to the second shaft hole 22 and the upper end of the pump shaft 3 can be sealed by a sealing strip, so that the second shaft hole 22 and the pump shaft 3 can still maintain sealing during relative movement, reduce the medium from the side wall corresponding to the second shaft hole 22 and the upper end of the pump shaft 3 reflux, increase the amount of medium entering the suction flow area 6, and increase the medium circulation cooling efficiency. In other embodiments, the gap between the side wall corresponding to the second shaft hole 22 and the upper end of the pump shaft 3 is small, and even if there is a small amount of medium reflux, it does not affect the circulation cooling of the medium, and the refluxed medium penetrates between the components of the pump device to play a lubricating role.

[0049] In one embodiment, Figure 6 As shown, an annular wall 25 is provided on the side of the cover body 2 facing away from the pump body 1 , and the second axial hole 22 and the inlet 21 are both located in the area surrounded by the annular wall 25 .

[0050] The annular wall 25 forms a gathering area, enclosing the medium flowing out of the reflux channel 31 in the area, and the second axial hole 22 and the inlet 21 are both located in the gathering area, preventing the medium from flowing and diffusing to the outside, allowing it to flow into the inlet 21, and due to the presence of the spiral blades 8, the medium in the gathering area basically will not flow back to the reflux channel 31.

[0051] Furthermore, the annular wall 25 can also be used as an interface of the pump device and connected to an external delivery pipeline. At this time, the medium flowing out of the reflux channel 31 is remixed into the medium in the external delivery pipeline, and then can enter the suction area 6 from the inlet 21. When the annular wall 25 is used as an interface of the pump device, an annular groove 26 is provided on its outer peripheral wall, and a sealing ring 27 is provided in the annular groove 26.

[0052] In one embodiment, Figure 7 As shown, a transition chamber 24 is provided on the side of the cover body 2 facing the pump body 1 , and the transition chamber 24 is communicated with the pressure flow area 7 , and the transition chamber 24 is also communicated with the outlet 23 of the pump device.

[0053] The medium in the pressure flow area 7 flows through the transition cavity 24 and then flows out of the pump device. Further, the transition cavity 24 is in an arc shape as a whole, the transition cavity 24 does not penetrate the cover body 2, the outlet 23 is arranged on one side of the cover body 2, the outlet 23 is connected with the transition cavity 24 and is located on the side of the transition cavity 24, the medium flows out of the pressure flow area 7 and enters the arc-shaped transition cavity 24, the arc-shaped transition cavity 24 changes the flow direction of the medium, so that the medium can adjust the flow direction, flow out of the pump device in a straight flow direction, and output to other devices.

[0054] Specifically, the transition chamber 24 can cover the upper part of the pressure flow area 7. The transition chamber 24 includes an arc flow channel 241 and an outlet flow channel 242 perpendicular to the pump shaft 3. The arc flow channel 241 corresponds to the flow direction of the medium rotating out of the pressure flow area 7, and gradually changes the rotational flow direction of the medium to flow out in a direction perpendicular to the pump shaft 3, and finally flows out smoothly through the outlet flow channel 242, reducing the probability of the medium being blocked by sudden corners during transportation, so that the medium can flow smoothly.

[0055] In one embodiment, Figure 8 , 9 As shown, the pump body 1 is provided with a blocking platform 10, which separates the pressure flow area 7 from the accommodating chamber 8. The blocking platform 10 is provided with a first axial hole 101 and a through hole 103. The pump shaft 3 passes through the first axial hole 101, and the through hole 103 is opposite to the suction flow area 6.

[0056] The outer rotating wheel 4 and the inner rotating wheel 5 are located between the blocking platform 10 and the cover body 2 . The blocking platform 10 is provided with a blocking wall 102 opposite to the pressure flow area 7 . The blocking wall 102 closes the lower end of the pressure flow area 7 .

[0057] The blocking platform 10 separates the pressure flow zone 7 and the accommodating chamber 8 to prevent the pressure flow zone 7 from being connected to the accommodating chamber 8, so that the medium in the pressure flow zone 7 can flow out of the pump device smoothly. Specifically, the blocking platform 10 has a blocking wall 102 that can close the bottom of the pressure flow zone 7, so that the medium in the pressure flow zone 7 enters the transition chamber 24 from its upper end and flows out of the pump device normally, and does not flow out from the lower end of the pressure flow zone 7. It should be noted that the blocking wall 102 fits with the bottom surface of the wall corresponding to the pressure flow zone 7 to close the bottom of the pressure flow zone 7. This fit inevitably leaves a gap, but the gap is small enough to affect the normal flow of the medium in the pressure flow zone 7. At this time, it can still be considered that the blocking platform 10 separates the pressure flow zone 7 and the accommodating chamber 8, or it should still be considered that the blocking platform 10 has a blocking wall 102 that can close the bottom of the pressure flow zone 7.

[0058] The blocking platform 10 and the side wall of the pump body 1 form a placement cavity, and the outer rotating wheel 4 and the inner rotating wheel 5 are arranged in the placement cavity, and then the cover body 2 covers the placement cavity, and the cavity wall corresponding to the placement cavity radially limits the outer rotating wheel 4 and the inner rotating wheel 5, and the cover body 2 and the blocking platform 10 axially limit the outer rotating wheel 4 and the inner rotating wheel 5, so that the outer rotating wheel 4 and the inner rotating wheel 5 can only rotate in the placement cavity.

[0059] Furthermore, if Fig. 9 As shown, a limiting cylinder 104 extends downward from one side of the blocking platform 10 facing the accommodating cavity 8, and the inner cavity of the limiting cylinder 104 is connected to the first axial hole 101. The pump shaft 3 can rotate relative to the limiting cylinder 104. The limiting cylinder 104 wraps a portion of the outer wall of the pump shaft 3 to radially limit the pump shaft 3 to prevent the pump shaft 3 from being excessively offset radially.

[0060] In one embodiment, the pump device is placed horizontally and the pump shaft 3 is located below the inlet 21. At this time, the inlet 21 is located on the side of the accommodating chamber 8. When the pump device is placed horizontally, the inlet 21 is still kept above the second axial hole 22, so that the medium in the accommodating chamber 8 can submerge the reflux channel 31 of the pump shaft 3, thereby being able to enter the reflux channel 31 and flow out of the reflux channel 31 back to the inlet 21.

[0061] In one embodiment, the stator 18 may be fixedly connected to the side wall of the pump body 1 by welding or the like, and the rotor 19 may be fixedly connected to the pump shaft 3 by welding or the like.

[0062] In one embodiment, Fig.14 As shown, the reflux channel 31 connects the accommodating chamber 8 with the outlet 23 of the pump device. Specifically, the second axial hole 22 does not penetrate the cover body 2, and the second axial hole 22 is connected with the transition chamber 24 through the flow channel 20, so that the second axial hole 22 is connected with the outlet 23, and the upper end of the pump shaft 3 extends into the second axial hole 22, and there is a space between the upper end of the pump shaft 3 and the bottom wall corresponding to the second axial hole 22, and the reflux channel 31 is connected with the flow channel 20 through the space, so that under the action of the flow-aiding member or the spiral guide groove, the medium in the reflux channel 31 can enter the flow channel 20 through the space, and then enter the transition chamber 24, and finally be discharged through the outlet 23.

[0063] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technical solution, conception, and design obtained by equivalent replacement or modification of the technical solution and inventive concept of the present invention by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A pump device, comprising a pump body (1), a cover body (2), and a pump shaft (3), wherein the pump body (1) has a receiving chamber (8), the pump device has a stator (18) and a rotor (19), the stator (18) and the rotor (19) are located in the receiving chamber (8), the stator (18) is located at least partially around the outer periphery of the rotor (19), and the rotor (19) is connected to the pump shaft (3), characterized in that: The pump device comprises a reflux channel (31), at least part of which is located inside the pump shaft, and the reflux channel (31) connects the accommodating chamber (8) with the inlet (21) of the pump device, or the reflux channel (31) connects the accommodating chamber (8) with the outlet (23) of the pump device; The pump device comprises a flow-aiding member, at least part of which is located inside the pump shaft (3), and the reflux channel (31) is located between the flow-aiding member and the inner wall of the pump shaft (3); and / or, a spiral guide groove is provided inside the pump shaft (3), and the reflux channel (31) includes the spiral guide groove.

2. The pump device according to claim 1, characterized in that The flow-assisting member comprises a spiral blade (9) arranged in the reflux channel (31); the pump shaft (3) and the spiral blade (9) are fixed, or the pump shaft (3) and the spiral blade (9) are capable of relative rotation.

3. The pump device according to claim 2, characterized in that The pump shaft (3) is provided with a rotating shaft (11), the rotating shaft (11) is located in the reflux channel (31), the spiral blades (9) are provided on the outer surface of the rotating shaft (11), and the spiral blades (9) are fixed to the pump shaft (3) via the rotating shaft (11); or, the pump shaft (3) is provided with a rotating shaft (11), the rotating shaft (11) is located in the reflux channel (31), the spiral blades (9) are provided on the outer surface of the rotating shaft (11), and the rotating shaft (11) is fixed to the pump body (1).

4. The pump device according to claim 3, characterized in that The lower end of the rotating shaft (11) is provided with a first end cover (12), and the first end cover (12) is welded and fixed to the lower end of the pump shaft (3).

5. The pump device according to claim 3 or 4, characterized in that The upper end of the rotating shaft (11) is provided with a second end cover (16), and the second end cover (16) is welded and fixed to the upper end of the pump shaft (3). The side wall of the upper end of the pump shaft (3) is provided with a liquid outlet (17), and the liquid outlet (17) is connected to the inlet (21).

6. The pump device according to claim 3, characterized in that The upper end or the lower end of the rotating shaft (11) is welded and fixed to the pump shaft (3) via a connecting rib (13), and the connecting rib (13) is in an arc shape.

7. The pump device according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The pump body (1) is provided with an outer rotating wheel (4) and an inner rotating wheel (5), the outer rotating wheel (4) having internal meshing teeth, the inner rotating wheel (5) having external meshing teeth matching the internal meshing teeth, the inner rotating wheel (5) being connected to the pump shaft (3), the outer rotating wheel (4) and the inner rotating wheel (5) being eccentrically arranged, a suction area (6) and a pressure area (7) being arranged between the internal meshing teeth and the external meshing teeth, the inlet (21) being connected with the suction area (6), the suction area (6) being connected with the accommodating chamber (8), and the accommodating chamber (8) being connected with the inlet (21) via the reflux channel (31).

8. The pump device according to claim 1 or 2 or 3 or 4 or 6, characterized in that: The pump body (1) is provided with a blocking platform (10), the blocking platform (10) separates the pressure flow area (7) and the accommodating chamber (8), the blocking platform (10) is provided with a first axial hole (101) and a through port (103), the pump shaft (3) passes through the first axial hole (101), and the suction flow area (6) is connected to the accommodating chamber (8) through the through port (103).

9. The pump device according to claim 8, characterized in that The outer rotating wheel (4) and the inner rotating wheel (5) are located between the blocking platform (10) and the cover body (2), and the blocking platform (10) is provided with a blocking wall (102) opposite to the pressure flow area (7).

10. The pump device according to claim 7, characterized in that The pump device has a medium channel, and the medium channel includes a first flow path and a second flow path. The first flow path includes the flow inlet (21), the suction area (6), the pressure area (7), and the flow outlet (23). The second flow path includes the flow inlet (21), the suction area (6), the accommodating chamber (8), and the reflux channel (31).

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