Pump device

Abstract

The invention discloses a pump device which comprises a pump body, an inner rotating wheel and an outer rotating wheel, a flow sucking area and a flow pressing area are arranged between the inner rotating wheel and the outer rotating wheel, the pump body is provided with a containing cavity, the pump device is provided with a rotor and a stator, the rotor and the stator are located in the containing cavity, the rotor is located on at least part of the periphery of the stator, and the stator is located in the containing cavity. The pump device is provided with a flow inlet channel, a flow outlet channel, a torrent channel and a flow passing channel, the torrent channel is communicated with the flow outlet channel and the pressure flow area, the torrent channel comprises a first flow channel and a second flow channel, the flow area of the first flow channel is larger than that of the second flow channel, the second flow channel is communicated with the flow outlet channel of the pump device, and the flow passing channel is communicated with the flow passing channel of the pump device. And the flow passing channel is communicated with the accommodating cavity and the second flow channel. According to the pump device, through the medium flow channel in the containing cavity, the cooling effect on components in the pump body is achieved, and the probability that the use performance is affected due to temperature rising is reduced.

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 comprises a pump body, an inner rotating wheel, and an outer rotating wheel, wherein at least parts of the inner rotating wheel and the outer rotating wheel are located in the pump body, and a suction flow area and a pressure flow area are provided between the inner rotating wheel and the outer rotating wheel, the pump body has a accommodating chamber, the pump device has a rotor and a stator, the rotor and the stator are located in the accommodating chamber, and the rotor is located at least part of the outer periphery of the stator, the pump device is provided with an inlet channel, an outlet channel, a torrent channel, and an overflow channel, the inlet channel is connected with the suction flow area, the torrent channel connects the outlet channel with the pressure flow area, the torrent channel comprises a first flow channel and a second flow channel, the flow area of ​​the first flow channel is larger than the flow area of ​​the second flow channel, the second flow channel is connected with the outlet channel of the pump device, the flow area of ​​the second flow channel is smaller than the flow area of ​​the outlet channel, and the overflow channel connects the accommodating chamber with the second flow channel.

[0006] In the pump device of the above technical solution, the flow area of ​​the second flow channel is smaller than the flow areas of the first flow channel and the outlet flow channel, thereby forming a structure similar to a Venturi tube, so that the medium in the second flow channel flows at high speed, and the high-speed flowing medium flows in the second flow channel to generate negative pressure, thereby being able to suck in and merge the medium in the flow channel, and the flow channel is connected to the accommodating cavity, thereby realizing the flow discharge of the medium in the pump body accommodating cavity, forming a cooling effect on the internal components such as the rotor and stator in the accommodating cavity, and reducing the probability of affecting their performance due to temperature increase.

[0007] 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

[0008] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0009] Figure 1 is a schematic cross-sectional structural diagram of a pump device according to an embodiment;

[0010] Figure 2 A schematic diagram of the structure of a pump device according to an embodiment in which a pump body and a cover body are separated;

[0011] Figure 3 A schematic diagram showing the structure of the first cavity and the second cavity in an embodiment;

[0012] Figure 4 is a schematic structural diagram of a torrent channel in an embodiment;

[0013] Figure 5 This is a structural schematic diagram of the communication between the accommodating chamber and the pressure flow area in an embodiment;

[0014] Figure 6 This is a schematic diagram of a structure in which the accommodating chamber is connected to the shaft channel 51 in an embodiment;

[0015] Figure 7 A schematic diagram showing a cross-sectional structure of a flow pipe in an embodiment;

[0016] Figure 8 A schematic diagram showing the structure of the inner rotating wheel and the outer rotating wheel in an embodiment;

[0017] Fig. 9 A schematic structural diagram showing a cover body from one perspective in an embodiment;

[0018] Fig.10 A schematic structural diagram showing a pump body from one perspective in an embodiment;

[0019] Fig.11 A schematic structural diagram showing another perspective of a pump body in an embodiment.

[0020] Reference numerals:

[0021] 1. Pump body, 2. Cover body, 3. Inner rotating wheel, 4. Outer rotating wheel, 5. Pump shaft, 51. Shaft channel, 6. Suction area, 7. Pressure area, 8. Accommodating chamber, 801. First chamber, 802. Second chamber, 9. Inlet channel, 91. Outlet channel, 10. Rapid flow channel, 101. First flow channel, 102. Second flow channel, 11. Rotor, 12. Stator, 13. Flow hole, 14. Flow pipe, 15. Control board, 16. Transition chamber, 17. Through hole, 18. Blocking platform, 181. Blocking wall, 19. First connecting port, 20. Limiting cylinder, 21. Guide hole, 22. Second connecting port. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1-Figure 11 As shown, a pump device of this embodiment includes a pump body 1, a cover body 2, an inner rotating wheel 3 and an outer rotating wheel 4, at least part of the inner rotating wheel 3 and the outer rotating wheel 4 are located in the pump body 1, and there is a suction area 6 and a pressure area 7 between the inner rotating wheel and the outer rotating wheel 4, the pump body 1 has a receiving chamber 8, the pump device has a rotor 11 and a stator 12, the rotor 11 and the stator 12 are located in the receiving chamber 8, the rotor 11 is located at least part of the outer periphery of the stator 12, the pump device has an inlet channel 9, an outlet channel 91, a torrent channel 10, a flow passage 11, and a flow passage 12. Channel, the inlet channel 9 is connected with the suction area 6, the torrent channel 10 is connected with the outlet channel 91 and the pressure flow area, the torrent channel 10 includes a first flow channel 101 and a second flow channel 102, the flow area of ​​the first flow channel 101 is larger than the flow area of ​​the second flow channel 102, the second flow channel 102 is connected with the outlet channel 91, the flow area of ​​the second flow channel 102 is smaller than the flow area of ​​the outlet channel 91, the second flow channel 102 is connected with the flow passage, and the flow passage connects the accommodating cavity 8 and the second flow channel 102.

[0024] The second flow channel 102 is located between the first flow channel 101 and the outlet channel 91, and the flow areas of the first flow channel 101 and the outlet channel 91 are both larger than the flow area of ​​the second flow channel 102, so that the first flow channel 101, the second flow channel 102, and the outlet channel 91 form a structure similar to a Venturi tube. The medium of the pump device enters the second flow channel 102 and forms a high-speed flow channel, so that the second flow channel 102 has a lower pressure, which generates suction on the flow channel, sucks the medium in the flow channel into the second flow channel 102 and mixes it, and then discharges it through the outlet channel 91, while the medium in the accommodating chamber 8 continues to flow into the flow channel, so that the medium in the accommodating chamber 8 flows, forming a cooling effect on the internal components such as the rotor 11 and the stator 12 in the accommodating chamber 8, thereby reducing the probability of affecting their performance due to temperature increase.

[0025] In one embodiment, the outflow channel 91, the inflow channel 9, and the torrent channel 10 are all arranged on the cover body 2, which can be formed by one-piece molding combined with punching; or in other embodiments, the outflow channel 91 can also be formed separately by an outflow pipe, and the outflow pipe is fixed to the cover body by welding or the like.

[0026] The flow area is the cross-sectional area of ​​the flow channel wall corresponding to each flow channel. The flow area of ​​the medium is changed by the cross-sectional area, so that the flow velocity of the medium in different flow channels can be achieved. A structure similar to a Venturi tube can be formed to achieve the flow of the medium in the pump device accommodating chamber 8, thereby cooling the rotor 11, stator 12 and other components in the accommodating chamber 8.

[0027] The inner rotating wheel 3 and the outer rotating wheel 4 can be completely located in the pump body 1 , or partially located in the pump body 1 and partially extending out of the pump body 1 and covered by the cover body 2 .

[0028] Furthermore, the outer rotating wheel 4 has internal meshing teeth, the inner rotating wheel 3 has external meshing teeth matching the internal meshing teeth, the inner rotating wheel 3 is connected to the pump shaft 5, the outer rotating wheel 4 and the inner rotating wheel 3 are eccentrically arranged, and a suction flow area 6 and a pressure flow area 7 are provided between the internal meshing teeth and the external meshing teeth. The pump body 1 has an accommodating cavity 8, and the accommodating cavity 8 has a rotor 11 and a stator 12. The rotor 11 and the pump shaft 5 can be fixedly connected by welding, and the stator 12 and the side wall of the pump body 1 can be fixedly connected by welding.

[0029] In one embodiment, Figure 8 As shown, there are always multiple meshing points between the outer rotating wheel 4 and the inner rotating wheel 3, 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 there is no mutual conduction between the outer rotating wheel 4 and the inner rotating wheel 3. Since the outer rotating wheel 4 and the inner rotating wheel 3 are eccentrically arranged, the rotor 11 rotates under the magnetic field force of the stator 12, and the rotor 11 drives the pump shaft 5 to rotate, and further the pump shaft 5 drives the inner rotating wheel 3 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 3 continues to rotate, part of the medium in the suction flow area 6 rotates to the pressure flow area 7, and the spatial volume of the pressure flow area 7 decreases, and the pressure of the pressure flow area 7 increases. The medium flows to the first flow channel 101 under the high pressure of the pressure flow area 7, and then enters the second flow channel 102 from the first flow channel 101 and is accelerated, and finally discharged from the pump device through the outlet channel 91. The medium flows at a high speed in the second flow channel 102, thereby generating negative pressure, sucking the medium in the flow passage into the second flow channel 102 and then out of the pump device.

[0030] 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 directly 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 flow channel from the accommodating chamber 8, and enter the second channel 102 under the suction of the high-speed flowing medium in the second channel 102 to merge and then flow out, thereby realizing the flow of the medium in the accommodating chamber 8, and then cooling the internal components such as the rotor 11 and the stator 12 in the accommodating chamber 8, having a good cooling effect on the internal components of the accommodating chamber 8 in the pump body 1, and 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 1 The 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 flow channel to the second channel 102.

[0031] In one embodiment, the number of teeth of the inner rotating wheel 3 is one less than that of the outer rotating wheel 4, the inner rotating wheel 3 and the outer rotating wheel 4 are eccentrically arranged, and the inner rotating wheel 3 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 3 and the outer rotating wheel 4 will not be connected and affect each other, and the medium in the suction flow area 6 moves to the pressure flow area 7 under the rotation of the pump shaft 5, and then is discharged under the action of the volume change of the pressure flow area 77, when one tooth of the inner rotating wheel 3 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, and the pump shaft 5 continues to rotate, and one tooth of the inner rotating wheel 3 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 3 can also be two or more less than that of the outer rotating wheel 4, and the principle is the same, which will not be repeated.

[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 may also be other liquids or other media that meet the requirements.

[0033] like Figure 1-Figure 7As shown, in one embodiment, the inlet channel 9 and the torrent channel 10 are arranged on the cover body 2, the cover body 2 is located above the pump body 1, the pump device is placed vertically or the inlet channel 9 is placed on the upper side in an inclined state, at this time, the inlet channel 9 is located above the accommodating chamber 8, the external medium enters the suction area 6 under the suction 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 3, a part of the medium enters and fills the accommodating chamber 8 under its own gravity, and then enters the flow channel, and then flows through the flow channel into the second channel 102, and finally discharges the pump device, thereby realizing the flow of the medium in the accommodating chamber 8, and achieving the cooling effect of the internal components of the accommodating chamber 8. It can be understood that the internal components of the accommodating chamber 8 include the stator 12, the rotor 11, the pump shaft 5 fixedly connected to the rotor 11, the control board 15 and other components.

[0034] In one embodiment, Figure 1-Figure 3 As shown, the flow passage includes a flow hole 13 on the side wall of the pump body 1 , and the flow hole 13 connects the accommodating chamber 8 with the second passage 102 .

[0035] In one embodiment, the flow hole 13 and the second channel 102 are located on the same side of the pump body 1, one end of the flow hole 13 is connected to the second channel 102, and the other end is connected to the accommodating chamber 8. The side wall of the pump body 1 has a certain thickness, and the flow hole 13 can be formed by punching a hole in the side wall of the pump body 1. In this case, it is only necessary to ensure the appropriate thickness of the side wall of the pump device, and the overall volume of the pump device will not change significantly.

[0036] In one embodiment, Figure 3 As shown, the accommodating chamber 8 includes a first chamber 801, and the first chamber 801 is located between the stator 12 and the cover body 2, and the entrance of the flow hole 13 is set at the chamber wall corresponding to the first chamber 801. When the pump device is placed vertically and the first chamber 801 is located above the stator 12, the medium enters the accommodating chamber 8 and gradually fills the lower part of the accommodating chamber 8 without passing through the stator 12. The medium will not flow from the flow hole 13 to the second channel 102 until it reaches the first chamber 801, thereby ensuring that the medium can contact the stator 12 over a large area, greatly improving its cooling efficiency on the stator 12. The chamber wall corresponding to the first chamber 801 is the side wall of the upper half of the pump body 1 opposite to the first chamber 801.

[0037] In one embodiment, the accommodating chamber 8 includes a second chamber 802, the second chamber 802 is located between the stator 12 and the bottom end of the pump body 1, the second chamber 802 is provided with a control board 15, and the entrance of the flow passage is located above the control board 15. That is, when the pump device is placed vertically and the second chamber 802 is located below the stator 12, the medium enters the accommodating chamber 8 and gradually fills the second chamber 802 and does not pass through the control board 15, thereby ensuring that the medium can contact the control board 15 over a large area, greatly improving its cooling efficiency on the control board 15. The first chamber 801 and the second chamber 802 are connected through the gap between the stator 12 and the rotor 11; or the first chamber 801 and the second chamber 802 are connected through the gap of the coil winding of the stator 12.

[0038] The inlet of the flow passage is located above the control panel 15, which should be understood as the position relationship of the pump device under normal use conditions, such as Figure 3 In the figure, the pump device is shown in a vertical placement state. In other embodiments, if the pump device is inverted as a common placement state, the inlet of the flow passage should be arranged below the control panel 15 accordingly.

[0039] In one embodiment, Figure 7 As shown, the pump device includes a flow pipe 14, and the flow channel includes an inner channel corresponding to the flow pipe 14. The flow pipe 14 connects the accommodating chamber 8 with the second channel 102, and there is no need to additionally thicken the side wall of the pump device, and there is no need to open a deeper hole in the axial direction on the side wall of the pump body 1, and only a through hole in the radial direction needs to be opened, which simplifies the processing.

[0040] Furthermore, the flow pipe 14 is located outside the pump body 1, and a through hole 17 is provided on the side wall of the pump body 1, and the through hole 17 connects the flow pipe 14 and the accommodating chamber 8. The inlet section of the flow pipe 14 is connected to the through hole 17, and the inlet section of the flow pipe 14 can be connected to the side wall of the pump body 1 by welding or the like, and the outlet section of the flow pipe 14 can also be connected to the channel wall corresponding to the second channel 102 by welding or the like.

[0041] In other embodiments, part of the flow pipe 14 may also be located in the accommodating cavity 8 of the pump body 1. In this case, the inlet section of the flow pipe 14 may be suspended in the accommodating cavity 8, and the outlet section of the flow pipe 14 passes through the side wall of the pump body 1 and is connected to the rapid flow channel 10.

[0042] The first flow channel 101 and the second flow channel 102 are connected via a connecting channel. The end of the connecting channel with a larger flow area is connected to the first flow channel 101, and the end of the connecting channel with a smaller flow area is connected to the second flow channel 102. The connecting channel connects the first flow channel 101 and the second flow channel 102 and can smoothly guide the medium in the first flow channel 101 to the second flow channel 102.

[0043] Furthermore, the flow area of ​​the first flow channel 101 is S1, the flow area of ​​the second flow channel 102 is S2, and S1 and S2 satisfy: If the flow area of ​​the second flow channel 102 is too large, the flow velocity of the medium inside it will be insufficient, resulting in insufficient negative pressure. If the flow area of ​​the second flow channel is too small, the outflow rate of the medium will be limited, thereby affecting the working efficiency of the pump device. The flow area of ​​the second flow channel 102 is between one quarter and one third of the flow area of ​​the first flow channel 101, ensuring the negative pressure in the second flow channel 102 and taking into account the output flow of the pump device.

[0044] In one embodiment, Figure 4 As shown, the side wall of the second channel 102 is provided with an inclined guide hole 21, and the guide hole 21 connects the through-flow channel and the second flow channel 102. The guide hole 21 is inclined in the direction away from the pump shaft 5, that is, the guide hole 21 is inclined in the outflow direction of the medium. At this time, the flow direction of the medium flowing out along the guide hole 21 follows the flow direction of the medium in the second flow channel 102, reducing the probability of the medium flow velocity in the second flow channel 102 being reduced due to the different flow directions, or reducing the probability of the medium in the second flow channel 102 flowing into the through-flow channel, ensuring that the medium in the accommodating chamber 8 can smoothly flow through the through-flow channel to the second flow channel 102 and flow out of the pump device.

[0045] In one embodiment, the flow area of ​​the flow passage is smaller than the flow area of ​​the second flow passage 102. The flow area of ​​the flow passage is smaller, so that the medium in the flow passage is more easily sucked into the rapid flow passage 10. Furthermore, the flow area of ​​the flow passage is not greater than one quarter of the flow area of ​​the second flow passage 102, ensuring the efficiency of the medium being sucked from the flow passage into the second flow passage 102.

[0046] In one embodiment, Fig.10 , Fig.11 The pump body 1 shown is provided with a blocking platform 18 , which separates the pressure flow area 7 from the accommodating chamber 8 , and the outer rotating wheel 4 and the inner rotating wheel 3 are located between the blocking platform 18 and the cover body 2 .

[0047] The blocking platform 18 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 18 has a blocking wall 181 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 16 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 181 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 18 separates the pressure flow zone 7 and the accommodating chamber 8, or it should still be considered that the blocking platform 18 has a blocking wall 181 that can close the bottom of the pressure flow zone 7.

[0048] The blocking platform 18 is provided with a first communicating opening 19 penetrating therethrough, and the first communicating opening 19 is in communication with the accommodating cavity 8 and the suction area 6 .

[0049] The blocking platform 18 and the side wall of the pump body 1 form a placement cavity, and the outer rotating wheel 4 and the inner rotating wheel 3 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 3, and the cover body 2 and the blocking platform 18 axially limit the outer rotating wheel 4 and the inner rotating wheel 3, so that the outer rotating wheel 4 and the inner rotating wheel 3 can only rotate in the placement cavity.

[0050] Furthermore, a limiting cylinder 20 is extended downward from the side of the blocking platform 18 facing the accommodating chamber 8. The limiting cylinder 20 has a second axial hole. The pump shaft 5 passes through the second axial hole and is connected to the inner rotating wheel 3. The pump shaft 5 can rotate relative to the limiting cylinder 20. The limiting cylinder 20 wraps a portion of the outer wall of the pump shaft 5 to radially limit the pump shaft 5 to prevent the pump shaft 5 from being excessively offset radially.

[0051] In one embodiment, Figure 5 As shown, the accommodating chamber 8 is connected with the pressure flow area 7. Specifically, the blocking platform 18 is provided with a second connecting port 22, and the second connecting port 22 connects the accommodating chamber 8 with the pressure flow area 7. At this time, the medium enters the suction flow area 6 through the inlet channel 9, and under the rotation cooperation of the inner rotating wheel 3 and the outer rotating wheel 4, the medium is transferred from the suction flow area 6 to the pressure flow area 7, and part of the medium in the pressure flow area 7 enters the outlet channel 91 through the second flow channel 102 and is discharged, and part of the medium in the pressure flow area 7 enters the accommodating chamber 8 through the second connecting port 22, and enters the second flow channel 102 through the flow channel.

[0052] In one embodiment, Figure 6As shown, the pump shaft 5 is provided with an axial channel 51, and the axial channel 51 communicates with the accommodating chamber 8 and the inlet channel 9. Specifically, the pump shaft 5 is provided with an axial channel 51, and the cover body 2 is provided with a first axial hole matched with the upper end of the pump shaft 5, and the pump shaft 5 is inserted into the first axial hole; the first axial hole is arranged through the cover body 2, and the pump shaft 5 can extend out of the first axial hole or not extend out of the first axial hole, and the axial channel 51 is connected with the inlet channel 9 or the first axial hole connects the axial channel 51 and the inlet channel 9. Part of the medium enters the suction flow area 6 through the inlet channel 9, and under the rotation cooperation of the inner rotating wheel 3 and the outer rotating wheel 4, the medium is transferred from the suction flow area 6 to the pressure flow area 7, and part of the medium in the pressure flow area 7 enters the outlet channel 91 through the second flow channel 102 and is discharged; part of the medium enters the axial channel 51 through the inlet channel 9, and then enters the accommodating chamber 8, and flows through the inlet channel into the second flow channel 102, and finally is discharged through the outlet channel 91.

[0053] In one embodiment, Fig. 9 As shown, a transition chamber 16 is provided on the side of the cover body 2 facing the pump body 1 , and the transition chamber 16 is communicated with the pressure flow area 7 , and the transition chamber 16 is communicated with the first flow channel 101 .

[0054] The medium in the pressure flow area 7 flows through the transition cavity 16, and then flows out of the pump device through the rapid flow channel 10. Further, the transition cavity 16 is in an arc shape as a whole, and the transition cavity 16 does not penetrate the cover body 2. The high-speed medium flows out of the pressure flow area 7 and enters the arc-shaped transition cavity 16. The arc-shaped transition cavity 16 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.

[0055] Specifically, the transition chamber 16 can cover the upper part of the pressure flow area 7. The transition chamber 16 includes an arc flow channel and a straight flow channel perpendicular to the pump shaft 5. The direction of the arc flow channel 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 perpendicular to the pump shaft 5, thereby reducing the probability of the medium being blocked by sudden corners during transportation, so that the medium can flow smoothly.

[0056] In one embodiment, the pump device is placed horizontally and the flow passage is located below the inlet passage 9, so that the medium in the accommodating chamber 8 can cover most of the components in the accommodating chamber 8, thereby ensuring the cooling efficiency of the medium flow.

[0057] The flow path of the medium is as follows: the medium flows from the inlet channel 9 of the pump device into the suction area 6, part of the medium enters the pressure area 7 from the suction area 6 and is discharged from the pump device through the second flow channel 102, and part of the medium enters the flow channel from the accommodating chamber 8. The medium in the flow channel enters the second flow channel 102 under the low-pressure suction of the second flow channel 102 and is finally discharged from the pump device.

[0058] Furthermore, most of the medium is brought from the suction area 6 into the pressure area 7 and then discharged from the pressure area 7 through the second flow channel 102, thereby ensuring the medium transportation efficiency of the pump device; a small part of the medium flows through the suction area 6 and enters the accommodating chamber 8, and then flows from the accommodating chamber 8 through the flow channel into the second flow channel 102 and is discharged, thereby realizing the flow of the medium, and then realizing the cooling of the internal components of the pump device.

[0059] 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), an inner rotating wheel (3), and an outer rotating wheel (4), wherein at least parts of the inner rotating wheel (3) and the outer rotating wheel (4) are located in the pump body (1), and a suction flow area (6) and a pressure flow area (7) are provided between the inner rotating wheel (3) and the outer rotating wheel (4), the pump body (1) has a receiving chamber (8), the pump device has a rotor (11) and a stator (12), the rotor (11) and the stator (12) are located in the receiving chamber (8), and the rotor (11) is located at least part of the outer periphery of the stator (12), characterized in that: The pump device comprises an inlet channel (9), an outlet channel (91), a torrent channel (10), and a flow passage; the inlet channel (9) is connected to the suction area (6); the torrent channel (10) is connected to the outlet channel (91) and the pressure area (7); the torrent channel (10) comprises a first flow channel (101) and a second flow channel (102); the flow area of ​​the first flow channel (101) is greater than the flow area of ​​the second flow channel (102); the second flow channel (102) is connected to the outlet channel (91); the flow area of ​​the second flow channel (102) is smaller than the flow area of ​​the outlet channel (91); and the flow passage connects the accommodating chamber (8) and the second flow channel (102).

2. The pump device according to claim 1, characterized in that The flow passage comprises a flow hole (13) provided on the side wall of the pump body (1), and the flow hole (13) connects the accommodating chamber (8) and the second flow passage (102).

3. The pump device according to claim 2, characterized in that The accommodating cavity (8) comprises a first cavity (801), wherein the first cavity (801) is located between the stator (12) and the cover body (2), and an entrance of the flow hole (13) is arranged on a cavity wall corresponding to the first cavity (801).

4. The pump device according to claim 1, 2 or 3, characterized in that: The accommodating chamber (8) comprises a second chamber (802), the second chamber (802) being located between the stator (12) and the bottom end of the pump body (1), the second chamber (802) being provided with a control plate (15), and the inlet of the flow passage being located above the control plate (15).

5. The pump device according to claim 1, characterized in that The pump device comprises a flow pipe (14), and the flow passage comprises an inner passage corresponding to the flow pipe (14).

6. The pump device according to claim 5, characterized in that At least part of the flow passage (14) is located outside the pump body (1), and a through hole (17) is provided on the side wall of the pump body (1), wherein the through hole (17) connects the flow passage (14) and the accommodating chamber (8).

7. The pump device according to claim 1 or 2 or 3 or 5 or 6, characterized in that: The side wall corresponding to the second flow channel (102) is provided with an inclined flow guide hole (21), the flow guide hole (21) connects the flow passage and the rapid flow passage (10), and the flow guide hole (21) is inclined in a direction away from the pump shaft (5); and / or, the flow area of ​​the first flow channel (101) is S1, the flow area of ​​the second flow channel (102) is S2, and S1 and S2 satisfy: And\or, the flow area of ​​the flow passage is smaller than the flow area of ​​the second flow channel (102).

8. The pump device according to claim 1 or 2 or 3 or 5 or 6, characterized in that: The suction area (6) is connected to the accommodating chamber (8) and the inlet channel (9); and / or the accommodating chamber (8) is connected to the pressure area (7); and / or the pump shaft (5) of the pump device is provided with an axial channel (51), and the axial channel (51) is connected to the accommodating chamber (8) and the inlet channel (9).

9. The pump device according to claim 1 or 2 or 3 or 5 or 6, characterized in that: The outer rotating wheel (4) has internal meshing teeth, the inner rotating wheel (3) has external meshing teeth matching the internal meshing teeth, the inner rotating wheel (3) is connected to the pump shaft (5), the outer rotating wheel (4) and the inner rotating wheel (3) are eccentrically arranged, the suction flow area (6) and the pressure flow area (7) are arranged between the internal meshing teeth and the external meshing teeth, the rotor (11) is connected to the pump shaft (5), and the stator (12) is connected to the side wall of the pump body (1).

10. The pump device according to claim 1 or 2 or 3 or 5 or 6, characterized in that: The pump body (1) is provided with a blocking platform (18), the blocking platform (18) separates the pressure flow area (7) and the accommodating chamber (8), the outer rotating wheel (4) and the inner rotating wheel (3) are located between the blocking platform (18) and the cover body (2); and / or, the pump device includes a cover body (2), and the inlet channel (9) and the rapid flow channel (10) are arranged on the cover body (2).

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