Pump device

Abstract

The invention discloses a pump device which comprises an inner rotor, an outer rotor, a pump shaft, a stator assembly, a first rotor assembly and a second rotor assembly, the second rotor assembly and the pump shaft are arranged in a fixed or limited mode, the pump device is provided with a liquid inlet, a liquid outlet, a containing cavity and a rotor cavity, and the stator assembly is located in the containing cavity. The second rotor assembly is located in the rotor cavity, the pump device is provided with a communication channel, the communication channel is communicated with the containing cavity, the communication channel is communicated with the liquid inlet or the liquid outlet, the containing cavity is communicated with an inlet of the rotor cavity, and an outlet of the rotor cavity is communicated with the liquid inlet or the liquid outlet. Or the pump device is provided with an external connector, and the outlet of the rotor cavity is communicated with the external connector. The heat dissipation device can be used for heat dissipation of heat production parts such as a stator assembly.

Description

Technical Field

[0001] The present application relates to the field of fluid control, and in particular to a pump device. Background Art

[0002] In the thermal management system or lubrication system of a vehicle, an electric pump is currently used. The pumping medium of this electric pump is generally oil. It is used to cool down high-temperature heat-generating components such as engines and motors in hybrid vehicles or electric vehicles or for lubrication of the system. Since the electric pump has components such as a stator assembly and a rotor assembly, the stator assembly will generate heat during the operation of the electric pump. When the electric pump is used for a long time, the heat accumulation will not only affect the working efficiency of the pump, but also reduce the service life of the pump. Therefore, how to remove the heat generated by the stator assembly during the operation of the pump and reduce the impact of heat accumulation on the pump is a very important technical issue. Summary of the invention

[0003] The object of the present invention is to provide a pump device for reducing the heat accumulation generated by the pump during operation.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] A pump device comprises an inner rotor, an outer rotor, a pump shaft, a stator assembly, and a first rotor assembly, wherein the inner rotor is located inside the outer rotor, the inner rotor meshes with the outer rotor, the pump shaft is limited or fixed to the inner rotor, the first rotor assembly and the pump shaft are fixed or limited, the stator assembly is sleeved outside the first rotor assembly, and the stator assembly can drive the first rotor assembly to rotate.

[0006] The pump device has a second rotor assembly, which is fixed or limitedly arranged with the pump shaft, and the pump device has a liquid inlet, a liquid outlet, a receiving chamber and a rotor chamber, the stator assembly is located in the receiving chamber, the second rotor assembly is located in the rotor chamber, and the pump device has a communication channel, which is communicated with the receiving chamber, the communication channel is communicated with the liquid inlet or the liquid outlet, and the receiving chamber is communicated with the inlet of the rotor chamber;

[0007] The outlet of the rotor cavity is communicated with the liquid inlet or the liquid outlet, or the pump device has an external interface, and the outlet of the rotor cavity is communicated with the external interface.

[0008] The pump device of the above technical solution comprises a first rotor assembly and a second rotor assembly. The first rotor assembly and the pump shaft are fixed or limited, and the second rotor assembly and the pump shaft are fixed or limited. When the pump shaft rotates, it can drive the first rotor assembly and the second rotor assembly to move. The second rotor assembly is located in the rotor cavity. Since the pump device has a connecting channel, the rotor cavity and the accommodating cavity are connected, and the connecting channel and the accommodating cavity are connected. In this way, a medium flows in the accommodating cavity where the stator assembly is located, which can be used for heat dissipation of the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic structural diagram of an embodiment of the present invention;

[0010] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of the structure shown;

[0011] Figure 3 for Figure 1 A top view schematic diagram of

[0012] Figure 4 for Figure 1 A schematic diagram of a part of the structure;

[0013] Figure 5 for Figure 1 A partial structural schematic diagram showing the inner and outer rotors;

[0014] Figure 6 for Figure 1 A schematic diagram of the structure of the middle separator;

[0015] Figure 7 for Figure 1 A schematic diagram of the structure of the impeller cover;

[0016] Figure 8 for Figure 1 A structural schematic diagram of the second rotor assembly;

[0017] Fig. 9 for Figure 1 A structural schematic diagram of the middle pump shaft;

[0018] Fig.10 A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0019] Fig.11 for Fig.10 A partial cross-sectional schematic diagram of another angle of the embodiment shown;

[0020] Fig.12 A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0021] Fig.13A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0022] Fig.14 for Fig.13 A schematic structural diagram of the second rotor assembly;

[0023] Fig.15 for Fig.13 Schematic diagram of the structure of the middle pump shaft;

[0024] Fig.16 A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0025] Fig.17 A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0026] Fig.18 A partial cross-sectional schematic diagram of another embodiment of the present invention;

[0027] Among them, the pump device 10, 10', 10", 10"', 10"", 10""', the shell 1, the partition 11, the support groove 12, the support wall 121, the partition 13, the connecting hole 14, the liquid inlet groove 15, the bottom wall 151 corresponding to the liquid inlet groove, the first through hole 16a, the mounting hole 17, the first sub-shell 18, the second sub-shell 19, the liquid outlet groove 20, the inner rotor 2, the outer rotor 3, the liquid inlet area 21, the liquid outlet area 22, the pump shaft 4, the assembly hole 41, the positioning pin 42, the spline groove 43, the positioning pin hole 45, the stator assembly 5, the first rotor assembly 6, the inlet Liquid inlet 101, liquid outlet 102, accommodating chamber 103, rotor chamber 104, connecting channel 105, external interface 106, rotor chamber inlet 107, rotor chamber outlet 108, second rotor assembly 7, impeller 71, impeller shaft 72, impeller cover 73, first cover 731, second cover 732, third cover 738, inlet pipe part 733, outlet pipe part 734, vortex groove 735, outlet pipe 737, boss part 739, circuit board 8, first through hole 81, second through hole 82, connecting part 9, conducting channel 91, pump cover 30. DETAILED DESCRIPTION

[0028] The following is a detailed description of the specific implementation of the present application in conjunction with the accompanying drawings. It should be understood that the following is only for illustration and does not limit the scope of the present application.

[0029] The pump device of the present application is used in, for example, a vehicle thermal management system or a lubrication system, and the medium in the pump device may be lubricating oil, cooling oil, or the like.

[0030] Reference Figure 1-Figure 9 , Figure 1-Figure 9The structure of a pump device 10 is shown in the figure. The pump device 10 comprises an inner rotor 2, an outer rotor 3, a pump shaft 4, a stator assembly 5, a first rotor assembly 6, and a pump cover 30. The pump device 10 has a liquid inlet 101, a liquid outlet 102, a receiving cavity 103, and a rotor cavity 104. The stator assembly 5 and the first rotor assembly 6 are located in the receiving cavity 103. The inner rotor 2 is located in the outer rotor 3. The inner rotor 2 is meshed with the outer rotor 3. The pump shaft 4 is limited or fixed with the inner rotor 2. The first rotor assembly 6 and The pump shaft 4 is fixed or limited in position, the stator assembly 5 is sleeved on the outside of the first rotor assembly 6, the stator assembly 5 can drive the first rotor assembly 6 to rotate, the first rotor assembly 6 can drive the pump shaft 4 to rotate, the pump shaft 4 can drive the inner rotor 2 to rotate, the inner rotor 2 rotates relative to the outer rotor 3, so that a liquid inlet area 21 and a liquid outlet area 22 are formed in the gear gap between the inner rotor 2 and the outer rotor 3, the liquid inlet area 21 is connected to the liquid inlet 101, and the liquid outlet area 22 is connected to the liquid outlet 102.

[0031] The pump device 10 has a second rotor assembly 7, which is fixed or limited to the pump shaft 4. The second rotor assembly 7 is located in the rotor cavity 104. The pump shaft 4 can also drive the second rotor assembly 7 to rotate. The second rotor assembly 7 rotates in the rotor cavity 104, driving the medium to enter from the inlet 107 of the rotor cavity 104 and move to the outlet 108 of the rotor cavity 104.

[0032] The pump device 10 has a connecting channel 105, which is connected to the accommodating chamber 103, and the connecting channel 105 is connected to the liquid inlet 101 or the liquid outlet 102. The accommodating chamber 103 is connected to the inlet 107 of the rotor chamber 104, and the outlet 108 of the rotor chamber 104 is connected to the liquid inlet 101 or the liquid outlet 102.

[0033] When the communication channel 105 is connected to the liquid inlet 101, the medium enters the pump device from the liquid inlet 101, and after the inner rotor 2 and the outer rotor 3 are meshed, most of the medium is compressed and pressurized and then leaves the pump device from the liquid outlet 102. A part of the medium enters the accommodating cavity 103 accommodating the stator assembly 5 after passing through the communication channel 105. The second rotor assembly 7 fixed or limited to the pump shaft 4 rotates with the rotation of the pump shaft 4. When a part of the medium enters the rotor cavity 104 through the accommodating cavity 103, the medium is driven by the second rotor assembly 7. After passing through the outlet of the rotor cavity 104, the medium leaves from the liquid inlet 101 or the liquid outlet 102. Thus, the low-pressure medium entering from the liquid inlet 101 enters the accommodating cavity 103, passes through the rotor cavity 104, and leaves from the liquid inlet 101 or the liquid outlet 102 of the pump device after being acted upon by the second rotor assembly 7. Thus, the low-pressure medium can be used for heat exchange with the stator assembly 5, the rotor assembly or other heat-generating components in the accommodating cavity 103, thereby reducing the heat accumulation of the heat-generating components such as the stator assembly 5 during the operation of the pump device, and can extend the service life of the pump device to a certain extent.

[0034] When the communication channel 105 is connected to the liquid outlet 102, after the medium enters the pump device from the liquid inlet 101, after the inner rotor 2 and the outer rotor 3 are meshed, a part of the medium is compressed and pressurized and then leaves the pump device from the liquid outlet 102, and a part of the medium enters the accommodating cavity 103 accommodating the stator assembly 5 through the communication channel 105 after being compressed. The second rotor assembly 7 fixed or limited to the pump shaft 4 rotates with the rotation of the pump shaft 4. When a part of the medium enters the rotor cavity 104 through the accommodating cavity 103, the medium is driven by the second rotor assembly 7. After the outlet 108 of the sub-cavity 104, the medium leaves from the liquid inlet 101 or the liquid outlet 102. In this way, a part of the compressed medium enters the accommodating chamber 103, and then passes through the rotor chamber 104. After being acted upon by the second rotor assembly 7, the medium leaves from the liquid inlet 101 or the liquid outlet 102 of the pump device. In this way, the flow energy of the medium in the accommodating chamber 103 can be used for heat exchange of the stator assembly 5, the first rotor assembly or other heat-generating components in the accommodating chamber 103, thereby reducing the heat accumulation of the stator assembly 5 and other heat-generating components during the operation of the pump device, and can extend the service life of the pump device to a certain extent.

[0035] exist Figure 1 In the illustrated embodiment, the first rotor assembly 6 includes a magnetic rotor, which rotates when the stator assembly 5 is energized, and the magnetic rotor and the pump shaft 4 are fixed or limited, so that when the magnetic rotor rotates, the pump shaft 4 rotates to drive the inner rotor 2 to rotate. The stator assembly 5 can be a coil or the like.

[0036] The second rotor assembly 7 has an impeller 71, and the impeller 71 is limited or fixed to an end of the pump shaft 4 away from the inner rotor 2, and the inner rotor 2 is limited or fixed to the opposite end of the pump shaft 4. When the pump shaft 4 rotates, it can drive the rotation of the impeller 71. In this embodiment, the pump shaft 4 and the impeller 71 are fixed or limited, and during the rotation of the inner rotor 2, the impeller 71 also rotates, and the rotation of the pump shaft 4 is effectively utilized to realize the transportation of the medium in the pump and the cooling of the heat-generating components such as the stator assembly 5. This embodiment is not only compact in structure, but also highly efficient.

[0037] The pump device 10 comprises a housing 1, a pump cover 30, a partition 11 and an impeller cover 73, wherein the housing 1 and the pump cover 30 are assembled and fixed. The partition 11 is sealed with the inner wall of the housing 1, the accommodating chamber 103 is located on one side of the partition 11, and the rotor chamber 104 is located on the other side of the partition 11; the impeller cover 73 and the partition 11 are assembled and fixed, and the rotor chamber 104 is located between the impeller cover 73 and the partition 11. In this embodiment, the partition 11 and the impeller cover 73 are arranged in the pump device, so that the partition 11 can be used for sealing the accommodating chamber 103 where the stator assembly 5 is located, and the assembly and fixation of the partition 11 and the impeller cover 73 also makes the assembly of the impeller 71 simple.

[0038] The pump device has a connecting part 9, the connecting part 9 has a conducting channel 91, the partition 11 has a communicating hole 14, one end of the conducting channel 91 is communicated with the accommodating chamber 103 through the communicating hole 14, the impeller cover 73 has an inlet 107 of the rotor chamber 104, and the other end of the conducting channel 91 is communicated with the inlet 107 of the rotor chamber 104. In this embodiment, the connection between the rotor chamber 104 and the accommodating chamber 103 is achieved through the connecting part 9, and the connecting part 9 can be, for example, in the form of a connecting pipe and integrally formed with the partition 11, or assembled and fixed with the partition 11, and such a structure is simple to assemble and relatively simple to manufacture.

[0039] The impeller cover 73 has an inlet 107 and an outlet 108 of the rotor chamber 104. The inlet 107 of the rotor chamber 104 is arranged at the bottom of the impeller cover 73. The inlet 107 of the rotor chamber 104 and the pump shaft 4 are arranged on the same axis. The outlet 108 of the rotor chamber 104 is located in the radial direction of the impeller 71. In this way, when the impeller 71 rotates, the medium located around the inlet 107 of the rotor chamber 104 is thrown out from the radial direction of the impeller 71 under the action of centrifugal force.

[0040] Reference Figure 6 and Figure 7 The partition 11 and the impeller cover 73 have matching mounting holes 17, and the partition 11 and the impeller cover 73 can be assembled and fixed by bolts or the like.

[0041] The pump device has an outlet pipe 737, the inner channel of which is in communication with the outlet 108 of the rotor chamber 104, the connecting portion 9 can be formed integrally with the impeller cover 73, the outlet pipe 737 can also be formed integrally with the impeller cover 73, and the impeller cover 73 can be formed by injection molding of plastic or other materials. The impeller cover 73 has a vortex groove 735, which extends to the outlet 108 of the rotor chamber, which is conducive to the medium entering from the connecting portion to leave the outlet of the rotor chamber along the vortex groove 735 under the action of the impeller 71.

[0042] Reference Figure 8 and Fig. 9 The second rotor assembly 7 includes an impeller 71 and an impeller shaft 72. The impeller 71 and the impeller shaft 72 may be formed integrally. Figure 8 As shown, of course, as another embodiment, the impeller 71 and the impeller shaft 72 can be fixed by assembly.

[0043] The end of the pump shaft 4 away from the inner rotor 2 has an assembly hole 41 and a positioning pin hole 45. The pump shaft 4 includes a positioning pin 42. At least part of the impeller shaft 72 is located in the assembly hole 41 in the pump shaft 4. When the impeller shaft 72 is placed in the assembly hole 41, the impeller shaft 72 and the pump shaft 4 are limited in the axial and radial directions by inserting the positioning pin 42 in the positioning pin hole 45, so that the pump shaft 4 can drive the impeller shaft 72 to rotate during the rotation process.

[0044] Combined with reference Figure 2 and Figure 3 The impeller cover 73 at least includes a first cover 731 and a second cover 732. The first cover 731 and the partition 11 are assembled and fixed, and the second cover 732 and the first cover 731 can be assembled and fixed. The rotor chamber 104 is located between the first cover 731 and the second cover 732. The second cover 732 has a vortex groove 735, and the impeller 71 is located between the first cover 731 and the second cover 732.

[0045] Return to reference Figure 2 and Figure 3 The housing 1 has a support groove 12, and the inner rotor 2 and the outer rotor 3 are located in the support groove 12. The housing 1 has a liquid inlet groove 15 and a liquid outlet groove 20, the liquid inlet groove 15 corresponds to and is connected with the liquid inlet area 21, the liquid outlet groove 20 corresponds to and is connected with the liquid outlet area 22, and the inner channel of the outlet pipe 737 is connected with the liquid outlet groove 20. The liquid inlet groove 15 penetrates the housing 1 to connect the liquid inlet area 21 and the accommodating chamber 103, and the liquid outlet groove 20 is connected with the inner channel of the outlet pipe 737, so that the medium in the accommodating chamber 103 can enter the liquid outlet groove 20 after passing through the outlet pipe 737, and can flow out from the liquid outlet area 22.

[0046] The outlet pipe 737 can pass through the gaps between the turns of the stator, which is beneficial to the arrangement of the outlet pipe 737 and makes the structure more compact.

[0047] More specifically, the housing 1 has a supporting wall 121, one side of the supporting wall 121 is a supporting groove 12, the other side of the supporting wall 121 is a receiving chamber 103, the liquid inlet groove 15 passes through the supporting wall 121, and the liquid outlet groove 20 passes through the supporting wall 121. In this embodiment, the liquid inlet groove 15 is a connecting channel 105 for connecting the receiving chamber and the liquid inlet area.

[0048] As other embodiments, refer to Fig.10 , Fig.10 The structure of a pump device 10' is shown in the figure. The general structure of the pump device can refer to the above embodiment. In this embodiment, the housing 1 has a liquid inlet groove 15, the liquid inlet groove 15 corresponds to and is connected to the liquid inlet area 21, and the pump device has an outlet pipe 737, the inner channel of the outlet pipe 737 is connected to the outlet 108 of the rotor chamber 104, and the inner channel of the outlet pipe 737 is connected to the liquid inlet groove 15.

[0049] Reference Fig.11 , the bottom wall 151 corresponding to the liquid inlet groove 15 has a first through hole 16a and a second through hole 16b, the first through hole 16a penetrates the bottom wall 151 corresponding to the liquid inlet groove 15, and the first through hole 16a is connected to the accommodating chamber 103. The outlet pipe 737 is sealed and matched with the side wall corresponding to the liquid inlet groove 15, at least part of the outlet pipe 737 is located in the second through hole 16b, and the port of the outlet pipe 737 is connected to the liquid inlet groove 15. After the medium of this embodiment enters the liquid inlet groove 15 through the liquid inlet area 21, it can enter the accommodating chamber 103 from the first through hole 16a, and then enter the liquid inlet groove 15 through the outlet pipe 737 after passing through the rotor chamber 104. The medium in the liquid inlet area 21 can leave the pump device from the liquid outlet area 22 under the action of the inner rotor 2 and the outer rotor 3. In this way, the medium can flow in the accommodating chamber 103 and can be used for heat dissipation of heat-generating components such as the stator assembly 5 in the accommodating chamber 103. The outlet pipe 737 can pass through the gaps between the turns of the stator, which is beneficial to the arrangement of the outlet pipe 737 and makes the structure more compact.

[0050] Reference Fig.12 , Fig.12The structure of a pump device 10 ″ is illustrated. The general structure of the pump device can refer to the above embodiment. In this embodiment, the pump device 10 ″ includes an inner rotor 2, an outer rotor 3, a pump shaft 4, a stator assembly 5, and a first rotor assembly 6. The pump device has a liquid inlet 101, a liquid outlet 102, a accommodating chamber 103 and a rotor chamber 104, wherein the stator assembly 5 and the first rotor assembly 6 are located in the accommodating chamber 103, the inner rotor 2 is located in the outer rotor 3, the inner rotor 2 is meshed with the outer rotor 3, the pump shaft 4 is limited or fixed with the inner rotor 2, the first rotor assembly 6 and the pump shaft 4 are fixed or limited, the stator assembly 5 is sleeved outside the first rotor assembly 6, the stator assembly 5 can drive the first rotor assembly 6 to rotate, the first rotor assembly 6 can drive the pump shaft 4 to rotate, the pump shaft 4 can drive the inner rotor 2 to rotate, the inner rotor 2 rotates relative to the outer rotor 3, so that a liquid inlet area 21 and a liquid outlet area 22 are formed in the gear gap between the inner rotor 2 and the outer rotor 3, the liquid inlet area 21 is connected to the liquid inlet 101, and the liquid outlet area 22 is connected to the liquid outlet 102.

[0051] The pump device has a second rotor assembly 7, which is fixed or limited to the pump shaft 4. The second rotor assembly 7 is located in the rotor cavity 104. The pump shaft 4 can also drive the second rotor assembly 7 to rotate. The second rotor assembly 7 rotates in the rotor cavity 104, driving the medium to enter from the inlet 107 of the rotor cavity 104 and move to the outlet 108 of the rotor cavity 104.

[0052] The pump device 10" comprises a housing 1, an impeller cover 73, and a circuit board 8, wherein the stator assembly 5 and the circuit board 8 are electrically connected. The circuit board 8 is located in the housing 1, and the circuit board 8 has a first through hole 81, through which the pump shaft 4 can pass, and the stator assembly 5 is located above the circuit board 8, and the circuit board 8 and the inner wall of the housing 1 are sealed, for example, by a sealant. The accommodating cavity 103 is located on one side of the circuit board 8, and the rotor cavity 104 is located on the other side of the circuit board 8.

[0053] The impeller cover 73 at least includes a first cover 731 and a second cover 732. The first cover 731 and the circuit board 8 are assembled and fixed, and the second cover 732 can be assembled and fixed with the first cover 731. The rotor chamber 104 is located between the first cover 731 and the second cover 732. The second cover 732 has a vortex groove 735, and the impeller 71 is located between the first cover 731 and the second cover 732.

[0054] In this embodiment, the circuit board 8 is arranged above the impeller cover 73, and the circuit board 8 and the impeller cover 73 are assembled and fixed. The circuit board 8 is not only used for the electrical connection of the stator assembly 5, but also can be used for sealing the accommodating cavity 103 where the stator assembly 5 is located. Such a structure is compact and occupies less space.

[0055] As other embodiments, refer to Fig.18 , Fig.18 The structure shown is generally Fig.12 Similar to the figure, in the present embodiment, the impeller cover 73 includes a first cover 731, a second cover 732 and a third cover 738. The first cover 731 and the circuit board 8 are assembled and fixed. The third cover 738 is arranged between the first cover 731 and the second cover 732, and the first cover 731 and the second cover 732 are fixed by the third cover 738. The third cover 738 is used for sealing the rotor cavity 104 where the impeller 71 is located. The channel formed between the third cover 738 and the second cover 732 is the flow path of the medium in the rotor cavity 104. The sealing by the third cover and the second cover 732 is beneficial to the size setting of the channel of the rotor cavity 104 where the impeller 71 is located, so that the medium entering from the inlet of the rotor cavity 104 can more advantageously leave from the outlet of the rotor cavity 104.

[0056] The pump device has a connecting portion 9, the connecting portion 9 has a conducting channel 91, the first cover 731 has a communicating hole 14, one end of the conducting channel 91 is communicated with the accommodating chamber 103 through the communicating hole 14, the second cover 732 has an inlet 107 of the rotor chamber 104, and the other end of the conducting channel 91 is communicated with the inlet 107 of the rotor chamber 104. In this embodiment, the connection between the rotor chamber 104 and the accommodating chamber 103 is achieved through the connecting portion 9, and the connecting portion 9 can be, for example, in the form of a connecting pipe and formed integrally with the second cover 732, or assembled and fixed with the second cover 732, or the connecting pipe can be formed integrally with the first cover 731, or assembled and fixed with the first cover 731, such a structure is easy to assemble and relatively simple to manufacture.

[0057] The second cover 732 has an inlet 107 and an outlet 108 of the rotor chamber 104. The inlet 107 of the rotor chamber 104 is arranged at the bottom of the second cover 732. The inlet 107 of the rotor chamber 104 and the pump shaft 4 are arranged on the same axis. The outlet 108 of the rotor chamber 104 is located in the radial direction of the impeller 71. In this way, when the impeller 71 rotates, the medium located around the inlet of the rotor chamber 104 is thrown out from the radial direction of the impeller 71 under the action of centrifugal force.

[0058] The circuit board 8 has a second through hole 82, the conducting channel 91 of the connecting part 9 is connected to the second through hole 82, and the second through hole 82 is connected to the accommodating chamber 103, so that the medium in the accommodating chamber 103 can enter the conducting channel 91 through the second through hole 82 of the circuit board 8, and enter the rotor chamber 104 through the conducting channel 91.

[0059] In this embodiment, the housing 1 of the pump device has an external interface 106, for example, the external interface 106 is arranged on the peripheral side of the housing 1, and the pump device has an outlet pipe 737, the internal channel of the outlet pipe 737 is connected to the outlet 108 of the rotor cavity 104, and the internal channel of the outlet pipe 737 is connected to the external interface 106, so that the medium entering the accommodating cavity 103 can absorb the heat dissipated by the stator assembly 5 and then leave the housing 1 of the pump device from the external interface 106. The medium leaving from the external interface 106 can be used for other purposes, or it can be returned to the liquid inlet 101 or the liquid outlet 102 of the pump device, for example, referring to Fig.17 As shown, Fig.17 The structure of the pump device 10'''' is shown.

[0060] Reference Figure 13-Figure 15 , Fig.13 The structure of a pump device 10'' is shown schematically. The general structure of the pump device can refer to the above embodiment. In this embodiment, the pump device 10'' includes an inner rotor 2, an outer rotor 3, a pump shaft 4, a stator assembly 5, and a first rotor assembly 6. The pump device has a liquid inlet 101, a liquid outlet 102, a accommodating chamber 103 and a rotor chamber 104, wherein the stator assembly 5 and the first rotor assembly 6 are located in the accommodating chamber 103, the inner rotor 2 is located in the outer rotor 3, the inner rotor 2 is meshed with the outer rotor 3, the pump shaft 4 is limited or fixed with the inner rotor 2, the first rotor assembly 6 and the pump shaft 4 are fixed or limited, the stator assembly 5 is sleeved outside the first rotor assembly 6, the stator assembly 5 can drive the first rotor assembly 6 to rotate, the first rotor assembly 6 can drive the pump shaft 4 to rotate, the pump shaft 4 can drive the inner rotor 2 to rotate, the inner rotor 2 rotates relative to the outer rotor 3, so that a liquid inlet area 21 and a liquid outlet area 22 are formed in the gear gap between the inner rotor 2 and the outer rotor 3, the liquid inlet area 21 is connected to the liquid inlet 101, and the liquid outlet area 22 is connected to the liquid outlet 102.

[0061] The pump device 10'' has a second rotor assembly 7, which is fixed or limited to the pump shaft 4. The second rotor assembly 7 is located in the rotor cavity 104. The pump shaft 4 can also drive the second rotor assembly 7 to rotate. The second rotor assembly 7 rotates in the rotor cavity 104, driving the medium to enter from the inlet 107 of the rotor cavity 104 and move to the outlet 108 of the rotor cavity 104.

[0062] The second rotor assembly 7 has an impeller 71, and the impeller 71 is limited or fixed to an end of the pump shaft 4 away from the inner rotor 2, and the inner rotor 2 is limited or fixed to the opposite end of the pump shaft 4. When the pump shaft 4 rotates, it can drive the rotation of the impeller 71. In this embodiment, the pump shaft 4 and the impeller 71 are fixed or limited, and during the rotation of the inner rotor 2, the impeller 71 also rotates, and the rotation of the pump shaft 4 is effectively utilized to realize the transportation of the medium in the pump and the cooling of the heat-generating components such as the stator assembly 5. This embodiment is not only compact in structure, but also highly efficient.

[0063] The pump device 10'' comprises a housing 1, a partition 11 and an impeller cover 73, wherein the partition 11 is sealed with the inner wall of the housing 1, the accommodating chamber 103 is located on one side of the partition 11, and the rotor chamber 104 is located on the other side of the partition 11; the impeller cover 73 and the partition 11 are assembled and fixed, and the rotor chamber 104 is located between the impeller cover 73 and the partition 11. In this embodiment, the partition 11 and the impeller cover 73 are arranged in the pump device, so that the partition 11 can be used for sealing the accommodating chamber 103 where the stator assembly 5 is located, and the assembly and fixation of the partition 11 and the impeller cover 73 also makes the assembly of the impeller 71 simple.

[0064] The pump device 10'' has a connecting portion 9, the connecting portion 9 has a conducting channel 91, the partition 11 has a communicating hole 14, one end of the conducting channel 91 is communicated with the accommodating chamber 103 through the communicating hole 14, the impeller cover 73 has an inlet 107 of the rotor chamber 104, and the other end of the conducting channel 91 is communicated with the inlet 107 of the rotor chamber 104. In this embodiment, the connection between the rotor chamber 104 and the accommodating chamber 103 is achieved through the connecting portion 9, and the connecting portion 9 can be, for example, in the form of a connecting pipe and formed integrally with the partition 11, or assembled and fixed with the partition 11. Such a structure is simple to assemble and relatively simple to manufacture.

[0065] The impeller cover 73 has an inlet 107 and an outlet 108 of the rotor chamber 104. The inlet 107 of the rotor chamber 104 is arranged at the bottom of the impeller cover 73. The inlet 107 of the rotor chamber 104 and the pump shaft 4 are arranged on the same axis. The outlet 108 of the rotor chamber 104 is located in the radial direction of the impeller 71. In this way, when the impeller 71 rotates, the medium located around the inlet of the rotor chamber 104 is thrown out from the radial direction of the impeller 71 under the action of centrifugal force.

[0066] In this embodiment, the housing 1 has a liquid inlet groove 15 and a liquid outlet groove 20, the liquid inlet groove 15 corresponds to and communicates with the liquid inlet area 21, the liquid outlet groove 20 corresponds to and communicates with the liquid outlet area 22, and the pump device has an outlet pipe 737, the inner channel of the outlet pipe 737 is communicated with the outlet 108 of the rotor cavity 104, and the inner channel of the outlet pipe 737 is communicated with the liquid outlet groove 20. The liquid inlet groove 15 penetrates the housing 1 to connect the liquid inlet area 21 and the accommodating cavity 103, and the liquid outlet groove 20 is communicated with the inner channel of the outlet pipe 737, so that the medium in the accommodating cavity 103 can enter the liquid outlet groove 20 after passing through the outlet pipe 737, and can flow out from the liquid outlet area 22.

[0067] The outlet pipe 737 can pass through the gaps between the turns of the stator, which is beneficial to the arrangement of the outlet pipe 737 and makes the structure more compact.

[0068] More specifically, the housing 1 has a supporting wall 121 , one side of the supporting wall 121 is the supporting groove 12 , the other side of the supporting wall 121 is the accommodating cavity 103 , the liquid inlet groove 15 passes through the supporting wall 121 , and the liquid outlet groove 20 passes through the supporting wall 121 .

[0069] The structure of the separator 11 can refer to Figure 6 and Figure 7 The partition 11 and the impeller cover 73 have matching mounting holes 17, and the partition 11 and the impeller cover 73 can be assembled and fixed by bolts or the like.

[0070] The connecting portion 9 can be formed integrally with the impeller cover 73, and the outlet pipe 737 can also be formed integrally with the impeller cover 73. The impeller cover 73 can be formed by injection molding of plastic or other materials. The impeller cover 73 has a vortex groove 735, which extends to the outlet 108 of the rotor cavity, which is conducive to the medium entering from the connecting portion to leave the outlet of the rotor cavity along the vortex groove 735 under the action of the impeller 71.

[0071] Reference Fig.14 and Fig.15 The second rotor assembly 7 includes an impeller 71 and an impeller shaft 72. The impeller 71 and the impeller shaft 72 may be formed integrally. Fig.14 As shown, of course, as another embodiment, the impeller 71 and the impeller shaft 72 can be fixed by assembly.

[0072] The end of the pump shaft 4 away from the inner rotor 2 has a spline groove 43, one end of the impeller shaft 72 has a spline, at least part of the impeller shaft 72 is located in the spline groove 43 in the pump shaft 4, and the pump shaft 4 and the impeller shaft 72 are connected by the spline. When the impeller shaft 72 is placed in the spline groove 43, the two are radially limited, so that the pump shaft 4 can drive the impeller shaft 72 to rotate during the rotation process.

[0073] One end of the impeller shaft 72 is spline-connected to the pump shaft 4, and the other end of the impeller shaft 72 can be axially limited by the impeller cover 73. For example, a bracket is provided on the impeller cover 73, which is used to abut against the other end of the impeller shaft, and the bracket has a through hole for the inlet medium of the rotor chamber to pass through.

[0074] The partition 11 is integrally provided with a boss portion 739, and the impeller cover 73 is assembled and fixed to the boss portion 739. The impeller 71 is located between the partition 11 and the impeller cover 73 so that a rotor cavity 104 is formed between the impeller cover 73 and the partition 11.

[0075] As other embodiments, refer to Fig.16 The pump device 10 ″″ has a housing 1 , wherein the housing 1 has a first partial shell 18 and a second partial shell 19 , wherein the first partial shell 18 and the second partial shell 19 are assembled and fixed to form an accommodating chamber 103 .

[0076] The housing 1 has a partition 13, more specifically, the second sub-shell 19 has a partition 13, the stator assembly 5 is located on one side of the partition 13, the partition 13 is a portion of the wall corresponding to the accommodating cavity 103, the rotor cavity 104 is located on the other side of the partition 13, the pump device has an impeller cover 73, the impeller cover 73 and the partition 13 are assembled, and the rotor cavity 104 is located between the impeller cover 73 and the partition 13. In this embodiment, the stator assembly 5 can be placed in the second sub-shell 19 and then fixed by assembling the first sub-shell 18 and the second sub-shell 19.

[0077] Specifically, the partition 13 has a connecting hole 14, the pump device has a connecting portion 9, the connecting portion 9 has a conducting channel 91, one end of the conducting channel 91 is connected to the accommodating chamber 103 through the communicating hole 14, the impeller cover 73 has an inlet 107 of the rotor chamber 104, the other end of the conducting channel 91 is connected to the inlet 107 of the rotor chamber 104, and the impeller cover 73 has a vortex groove 735, which connects the inlet 107 of the rotor chamber 104 and the outlet 108 of the rotor chamber 104. Placing the second rotor assembly in the rotor chamber 104 allows the medium in the accommodating chamber to flow through the rotation of the second rotor assembly, thereby achieving heat dissipation of heat-generating components such as the stator assembly in the accommodating chamber.

[0078] It should be understood that the above is only for illustration, and the above different embodiments can be combined. In the present invention, the accommodating chamber can be connected to the liquid inlet area, and the outlet pipe can also be connected to the liquid inlet area; or the accommodating chamber can also be connected to the liquid inlet area, and the outlet pipe can also be connected to the liquid inlet area; or the accommodating chamber is connected to the liquid outlet area, and the outlet pipe can also be connected to the liquid inlet area; or the accommodating chamber is connected to the liquid outlet area, and the liquid outlet can also be connected to the liquid outlet area; in addition, the outlet pipe can also be connected to the liquid inlet area or the liquid outlet area through an external interface, for example. This article does not give examples one by one, but as long as the connection of the accommodating chamber can be achieved, so that the medium entering the oil pump can be driven by the second rotor assembly and then leave the accommodating chamber, it belongs to the embodiment covered by the present invention.

[0079] It should be noted that the above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention, such as the directional definitions of "front", "back", "left", "right", "up" and "down". Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be combined, modified or replaced by each other, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A pump device, comprising an inner rotor (2), an outer rotor (3), a pump shaft (4), a stator assembly (5), and a first rotor assembly (6), wherein the inner rotor (2) is located inside the outer rotor (3), the inner rotor (2) and the outer rotor (3) are meshed and matched, the pump shaft (4) and the inner rotor (2) are limited or fixed, the first rotor assembly (6) and the pump shaft (4) are fixed or limited, the stator assembly (5) is sleeved outside the first rotor assembly (6), and the stator assembly (5) can drive the first rotor assembly (6) to rotate, characterized in that: The pump device comprises a second rotor assembly (7), the second rotor assembly (7) and the pump shaft (4) are fixed or position-limited, the pump device comprises a liquid inlet (101), a liquid outlet (102), a receiving cavity (103) and a rotor cavity (104), the stator assembly (5) is located in the receiving cavity (103), the second rotor assembly (7) is located in the rotor cavity (104), the pump device comprises a communication channel (105), the communication channel (105) and the receiving cavity (104) are connected to each other. The pump device is connected to a cavity (103), the connecting channel (105) is connected to the liquid inlet (101) or the liquid outlet (102), the accommodating cavity (103) is connected to the inlet (107) of the rotor cavity (104); the outlet (108) of the rotor cavity (104) is connected to the liquid inlet (101) or the liquid outlet (102), or the pump device has an external interface (106), and the outlet (108) of the rotor cavity (104) is connected to the external interface (106).

2. The pump device according to claim 1, characterized in that The second rotor assembly (7) has an impeller (71), and the impeller (71) is limited or fixed to an end of the pump shaft (4) away from the inner rotor (2), and the pump shaft (4) can drive the impeller (71) to rotate.

3. The pump device according to claim 2, characterized in that The pump device comprises a housing (1) and a partition (11), wherein the partition (11) is sealed with the inner wall of the housing (1), the accommodating chamber (103) is located on one side of the partition (11), and the rotor chamber (104) is located on the other side of the partition (11); the pump device comprises an impeller cover (73), wherein the impeller cover (73) and the partition (11) are assembled, the rotor chamber (104) is located between the impeller cover (73) and the partition (11), and the impeller cover (73) comprises a vortex groove (735); Alternatively, the pump device comprises a housing (1), wherein the housing (1) comprises a first sub-shell (18) and a second sub-shell (19), wherein the second sub-shell (19) comprises a partition (13), wherein the stator assembly (5) is located on one side of the partition (13), wherein the partition (13) is a portion of a wall corresponding to the accommodating cavity (103), and wherein the rotor cavity (104) is located on the other side of the partition (13); wherein the pump device comprises an impeller cover (73), wherein the impeller cover (73) and the partition (13) are assembled, wherein the rotor cavity (104) is located between the impeller cover (73) and the partition (13), and wherein the impeller cover (73) comprises a vortex groove (735).

4. The pump device according to claim 3, characterized in that The pump device has a connecting portion (9), the connecting portion (9) has a conducting channel (91), the partition (11) or the partition portion (13) has a connecting hole (14), the connecting hole (14) connects one end of the conducting channel (91) with the accommodating chamber (103), the impeller cover (73) has an inlet (107) of the rotor chamber (104), and the other end of the conducting channel (91) is connected to the inlet (107) of the rotor chamber (104).

5. The pump device according to claim 2, characterized in that The pump device comprises a circuit board (8), wherein the circuit board (8) is located in the housing (1), and the circuit board (8) is sealed with the inner wall of the housing (1), the accommodating cavity (103) is located on one side of the circuit board (8), and the rotor cavity (104) is located on the other side of the circuit board (8).

6. The pump device according to claim 5, characterized in that The pump device comprises a connecting portion (9) and an impeller cover (73), the connecting portion (9) having a conducting channel (91), the circuit board (8) having a second through hole (82), one end of the conducting channel (91) being in communication with the second through hole (82), the second through hole (82) being in communication with the accommodating chamber (103), the impeller cover (73) having an inlet (107) of the rotor chamber (104), the other end of the conducting channel (91) being in communication with the inlet (107) of the rotor chamber (104), and the impeller cover (73) having a vortex groove (735).

7. The pump device according to any one of claims 2 to 6, characterized in that The inlet (107) of the rotor chamber (104) and the pump shaft (4) are arranged on the same axis, and the outlet (108) of the rotor chamber (104) is located in the radial direction of the impeller (71).

8. The pump device according to any one of claims 1 to 7, characterized in that The second rotor assembly (7) has an impeller shaft (72), the impeller (71) and the impeller shaft (72) are fixed or limited, and the impeller shaft (72) and the pump shaft (4) are fixed or limited in the radial direction of the pump device.

9. The pump device according to claim 8, characterized in that The pump device has a positioning pin (42), the pump shaft (4) has an assembly hole (41), a portion of the impeller shaft (72) is located on the pump shaft (4), and the impeller shaft (72) and the pump shaft (4) are limited by the positioning pin (42); Alternatively, one end of the pump shaft (4) has a spline groove (43), one end of the impeller shaft (72) is located in the spline groove (43), and the impeller shaft and the pump shaft (4) are spline-connected.

10. The pump device according to any one of claims 1 to 9, characterized in that The pump device comprises a housing (1) and an outlet pipe (737); the housing (1) comprises a liquid inlet groove (15) and a liquid outlet groove (20); the liquid inlet groove (15) is the connecting passage (105); the liquid inlet groove (15) corresponds to and is connected to the liquid inlet area (21); the liquid outlet groove (20) corresponds to and is connected to the liquid outlet area (22); the internal passage of the outlet pipe (737) is connected to the outlet (108) of the rotor chamber (104); and the outlet pipe (737) is connected to the liquid outlet groove (20); the liquid inlet groove (15) runs through the housing (1); the liquid inlet groove (15) is connected to the liquid inlet area (21) and the accommodating chamber (103); and the liquid outlet groove (20) is connected to the internal passage of the outlet pipe (737); Alternatively, the pump device comprises a housing (1) and an outlet pipe (737), the housing (1) comprising a liquid inlet groove (15), the liquid inlet groove (15) being the connecting channel (105), the bottom wall (151) corresponding to the liquid inlet groove (15) comprising a first through hole (16a) and a second through hole (16b), the first through hole (16a) penetrating the bottom wall (151) corresponding to the liquid inlet groove (15), the first through hole (16b) being connected to the accommodating chamber (103), the outlet pipe (737) being sealed with a side wall corresponding to the liquid inlet groove (15), at least a portion of the outlet pipe (737) being located in the second through hole (16b), and the internal channel of the outlet pipe (737) being connected to the liquid inlet groove (15).

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