Motor pump

Abstract

The invention relates to a motor pump, and relates to the field of automobile active suspension technology application. The motor pump comprises a controller module, a motor module and a pump module, the controller module is used for sending a driving signal to the motor module so as to drive the pump module; the controller module comprises a controller shell and a controller assembly; the motor module comprises a motor shell and a motor assembly; the pump module comprises a pump cover and a pump body; the controller assembly is electrically connected with the motor assembly; the motor assembly is connected to the pump body; the pump body is located in the motor shell, the pump cover protrudes out of the motor shell, and the pump module is coaxially connected with the motor module. The controller housing is stacked with the motor housing. A flowing oil way of a pump head leakage medium is optimally designed, more hydraulic oil flows through a rotor cavity to take away heat of the motor and finally flows to a pump head low-pressure oil cavity through a one-way valve, the heat dissipation effect is improved, and the working duration and the service life of the motor pump are prolonged.

Description

Technical Field

[0001] The invention relates to the application field of automobile active suspension technology, and in particular to a motor pump. Background Art

[0002] The suspension motor pump is an electric hydraulic pump installed on the vehicle, which can drive the shock absorber to achieve Z-direction displacement control of the wheel.

[0003] In the related art, the suspension motor pump is usually designed with an integrated electronic control, a motor and an oil pump, and the controller and the oil pump are respectively installed at both ends of the motor, and the three are arranged in a coaxial state.

[0004] However, in the related art, the oil pump leakage medium flows into the motor rotor cavity and immediately flows out from the one-way valve on the pump body. The leakage medium does not flow in a large range in the rotor cavity, and most of the heat dissipation of the motor is natural convection heat dissipation. Summary of the invention

[0005] The present invention optimizes the design of the motor pump leakage oil circuit and designs the position of the one-way valve on the pump cover, so that most of the leakage medium of the oil pump flows into one end of the rotor cavity and flows out from the other end, flows back to the pump cover volume cavity through the motor shaft at the other end, and then returns the oil through the one-way valve. Forced convection heat dissipation of the medium is achieved, and the flow rate of the medium flowing into the rotor cavity is increased, which improves the heat dissipation effect of the motor, so that the motor pump can work for a longer time, and improves the performance and life of the motor pump.

[0006] The motor pump comprises a controller module, a motor module and a pump module; The controller module is used to send a driving signal to the motor module to drive the pump module; The controller module includes a controller housing and a controller assembly; The motor module includes a motor housing and a motor assembly; The pump module includes a pump cover and a pump body; The controller component is electrically connected to the motor component; The motor assembly is connected to the pump body; The pump body is located inside the motor housing, the pump cover protrudes from the motor housing, and the pump module is coaxially connected to the motor module; The controller housing is stacked with the motor housing; A pump cover cavity and a pump body cavity are formed inside the pump module; The pump body and the motor housing form a motor rotor cavity; The pump cover cavity, the pump body cavity and the motor rotor cavity are used to form a medium passage, and the medium flows into the motor rotor cavity through the pump body cavity to achieve forced convection heat exchange.

[0007] In an optional embodiment, the motor housing and the controller housing are implemented as an integrated housing; A first chamber, a second chamber and a third chamber are formed inside the integrated shell; The first chamber is used to accommodate the motor assembly and the pump body; The second chamber is used to accommodate the controller component; The third chamber is used to accommodate external devices.

[0008] In an optional embodiment, the motor assembly includes a motor shaft and a motor rotor; The motor shaft penetrates into the pump body; The motor rotor is connected to the motor shaft and is used to drive the motor shaft; The first end of the motor shaft is connected to the pump body for driving the gear of the pump body.

[0009] The end of the second end of the motor shaft is used for speed signal excitation.

[0010] In an optional embodiment, the motor assembly further includes a sliding bearing, and the sliding bearing is used to support the first end of the motor shaft.

[0011] In an optional embodiment, the motor assembly further includes a shielding sleeve, a sealing ring, and a supporting ring; The shielding sleeve, the motor coil and the support ring are located inside the first chamber; The shielding sleeve is used to seal the rotor cavity in the first cavity; The sealing ring is located at the connection between the shielding sleeve, the pump body and the inner surface of the first chamber; The support ring is used to support the shielding sleeve.

[0012] There is a supporting ring at each of the two ends of the shielding sleeve, wherein the supporting ring close to the pump body is plastic-wrapped in the shielding sleeve.

[0013] In an optional embodiment, the motor shaft is implemented as a hollow motor shaft; When the motor pump moves, the medium flows from the second end of the motor shaft to the first end of the motor shaft; When the motor shaft is connected to the pump body cavity, the shaft sleeve configured for the motor shaft has an oil groove.

[0014] In an optional embodiment, the pump module includes a pump cover housing, a medium exchange port, and a one-way valve; The medium exchange port is located at the top of the pump cover shell, and the medium exchange port is used to exchange the medium that powers the motor pump; When the pump module is working, a high-pressure pump cover cavity and a low-pressure pump cover cavity are formed in the pump module; The one-way valve is used to selectively transfer the high-pressure medium leaking in the medium passage from the high-pressure pump cover chamber to the low-pressure pump cover chamber.

[0015] In an optional embodiment, the number of the medium exchange port and the number of the oil port are both 2; The pump cover shell is provided with a one-way valve installation hole; The one-way valve is located in the one-way valve installation hole; The one-way valve installation hole and the pump cover cavity form a medium passage; The one-way valve is equipped with a one-way valve plug, which is located in the one-way valve installation hole.

[0016] In an optional embodiment, the oil passages formed by the two one-way valve mounting holes are parallel to each other; or, The oil passage formed by the two one-way valve mounting holes forms an obtuse angle.

[0017] In an optional embodiment, the external device includes at least one of an external wire and a rotation speed sensor.

[0018] The technical effects of various embodiments of the present invention include at least: When designing the pump structure assembly of the motor pump, the normal operation of the motor pump is ensured by coaxially setting the controller module and the motor module, and a cavity for forced convection heat exchange is formed inside the motor pump structure to achieve forced convection heat exchange. The leaked medium takes away the heat inside the motor, thereby improving the heat dissipation effect of the motor, allowing the motor pump to work for a longer time and improving the performance and life of the motor pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A structural block diagram of a motor pump provided by an exemplary embodiment of the present invention is shown.

[0021] Figure 2 A schematic structural diagram of a motor pump provided by an exemplary embodiment of the present invention is shown.

[0022] Figure 3 A schematic diagram of the oil circuit structure of a motor pump provided by an exemplary embodiment of the present invention is shown.

[0023] Figure 4 A partial cross-sectional schematic diagram of a pump module provided by an exemplary embodiment of the present invention is shown.

[0024] Figure 5A schematic diagram of a combined structure of an axial compensation structure and a radial compensation structure provided by an exemplary embodiment of the present invention is shown.

[0025] Figure 6 A schematic top view of a pump module structure provided by an exemplary embodiment of the present invention is shown.

[0026] Figure 7 A schematic diagram of the oil circuit direction of a motor pump provided by an exemplary embodiment of the present invention is shown.

[0027] Figure 8 A schematic cross-sectional view of a motor shaft sleeve in a pump body cavity provided by an exemplary embodiment of the present invention is shown.

[0028] Fig. 9 A schematic cross-sectional view of a motor shaft sleeve in a pump cover cavity provided by an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The motor pump shown in the embodiment of the present invention can be applied to industrial transmission and can also be applied to automobile active suspension to supply oil to the shock absorber as an oil pump.

[0031] Figure 1 A structural block diagram of a motor pump provided by an exemplary embodiment of the present invention is shown. Figure 2 A schematic structural diagram of a motor pump provided by an exemplary embodiment of the present invention is shown. Figure 3 FIG. 1 shows a schematic diagram of an oil circuit structure of a motor pump provided by an exemplary embodiment of the present invention. Figure 1 Until Figure 3 The motor pump includes a controller module 110, a motor module 120 and a pump module 130; the controller module 110 is used to send a driving signal and transmit electrical energy to the motor module 120, and the motor module converts the electrical energy into mechanical energy to drive the pump module 130; the controller module 110 includes a controller housing 111 and a controller component 112; the motor module 120 includes a motor housing 121 and a motor component 122; the pump module 130 includes a pump cover 131 and a pump body 132; the controller component 112 is electrically connected to the motor component 122; the motor component 122 is connected to the pump body 132; a part of the pump body 132 is located inside the motor housing 121, the pump cover 131 protrudes from the motor housing 121, and the pump module 130 is coaxially connected to the motor module 120; the controller housing 111 and the motor housing 121 are stacked.

[0032] In this case, please refer to Figure 3, a pump cover cavity 210 and a pump body cavity 220 are formed inside the pump module; In the embodiment of the present invention, there is no oil circuit design directly connecting the pump cover cavity and the pump body cavity.

[0033] The pump body and the motor housing form a motor rotor cavity 230; The pump cover cavity 210, the pump body cavity 220 and the motor rotor cavity 230 are used to form a medium passage, and the medium flows into the motor rotor cavity through the pump body cavity to achieve forced convection heat exchange.

[0034] In an embodiment of the present invention, the pump module is an internal gear pump module. Figure 3 During the movement of the motor, a high-pressure oil chamber 240 and a low-pressure oil chamber 250 are formed in the pump body cavity. The positions of the high-pressure oil leakage area and the low-pressure oil area will be converted according to the four-quadrant working principle of the internal gear pump. The present invention does not limit the specific positions of the high-pressure oil leakage area and the low-pressure oil area. In the embodiments of the present invention, please refer to Figure 4 The medium leakage of the high-pressure oil chamber first flows into the high-pressure oil chamber 240 in the pump body cavity, flows into the motor rotor cavity 230 through the high-pressure oil chamber 240, and finally flows into the low-pressure oil chamber 250. During the operation of the motor pump, the flow of the medium plays a role in forced convection heat dissipation of the motor.

[0035] In summary, the motor pump provided in the embodiment of the present invention ensures the normal operation of the motor pump by coaxially arranging the controller module and the motor module when designing the pump body structure assembly of the motor pump, and forms a cavity for forced convection heat exchange inside the motor pump structure to achieve forced convection heat exchange, and takes away the heat inside the motor through the leaked medium, thereby improving the heat dissipation effect of the motor, thereby allowing the motor pump to work for a longer time and improving the performance and life of the motor pump.

[0036] Next, the optimized design in the motor pump is described for the actual application scenario of the suspension motor pump in the embodiment of the present invention.

[0037] In an optional embodiment, the motor housing 121 and the controller housing 111 are implemented as an integrated housing 140; a first chamber 141, a second chamber 142 and a third chamber 143 are formed inside the integrated housing; the first chamber 141 is used to accommodate the motor assembly 122 and the pump body 132; the second chamber 142 is used to accommodate the controller assembly 112; and the third chamber 143 is used to accommodate an external device 150.

[0038] That is, in the embodiment of the present invention, the controller module, the motor module and the pump module are implemented as an integrated design structure, which can be implemented as interconnected metal frames, and the metal frames can be connected by bolts. The present invention does not limit the specific connection method between the metal frames.

[0039] In an optional embodiment, the external device includes at least one of an external wire and a rotation speed sensor.

[0040] In this case, the specific structure can be referred to Figure 2 The motor housing and the controller housing are divided into three chambers when combined. The first chamber is the motor chamber, which is used to install the motor assembly; and a bearing chamber is designed on the left side of the first chamber for installing the motor rotor bearing; a bearing cover is designed on the left side of the bearing chamber to seal the rotor chamber; the motor cover on the right side of the first chamber is designed as the pump body part of the pump assembly; the second chamber is located on the left side of the first chamber, which is used for the appearance of the motor three-phase line and the installation of the speed sensor; the second chamber is designed with a rear end cover seal; the third chamber is located on the upper part of the casing, which is used to install the controller, and the third chamber is connected to the second chamber; the third chamber is designed with an upper cover seal; the third chamber is designed with high and low voltage connector installation holes for installing high and low voltage connectors.

[0041] In an alternative embodiment, please refer to Figure 2 , the motor assembly 122 includes a motor shaft 1221 and a motor rotor 1222; the motor shaft 1221 penetrates the pump body 132; the motor rotor 1222 is connected to the motor shaft 1221, and is used to drive the motor shaft 1221; the first end of the motor shaft 1221 is connected to the pump cover 131, and is used to drive the pump assembly; the second end of the motor shaft 1221 is electrically connected to the third chamber 143, and is used to connect an external device. In this case, the motor shaft 1221 is a hollow motor shaft. The hollow design in the middle of the motor shaft is to allow the medium to flow into the pump cover cavity from the bottom of the rotor cavity, while reducing the moment of inertia and improving the response time.

[0042] In the embodiment of the present invention, the medium flowing into the rotor cavity will pass through the entire rotor cavity, flow to the other end of the rotor cavity, flow into the oil hole of the magnetic steel bolt at the other end and flow into the second end of the motor shaft; during the whole process, forced convection heat exchange is carried out with the motor stator and rotor to take away the heat generated by the motor. In order to allow more medium to flow into the rotor cavity for heat dissipation, there is no oil channel design under the pump cover bearing to ensure that as much leaked medium as possible flows into the rotor cavity before returning to the oil.

[0043] In the embodiment of the present invention, when the motor shaft penetrates the pump body, the motor rotor is connected to the motor shaft for driving the motor shaft; the first end of the motor shaft is connected to the pump body for driving the gear of the pump body. The end of the second end of the motor shaft is used for speed signal excitation.

[0044] In an optional embodiment, the motor assembly 122 further includes a shielding sleeve 1223, a sealing ring 1224 and a support ring 1225; the shielding sleeve 1223 and the support ring 1225 are located inside the first chamber; the shielding sleeve 1223 is used to seal the first chamber and to form a rotor chamber; the sealing ring 1224 is located at the connection between the shielding sleeve 1223 and the pump body and the inner surface of the first chamber; the support ring 1225 is used to support the shielding sleeve 1223. In the embodiment of the present invention, the number of the sealing ring 1224 and the support ring 1225 is two, respectively located on the side close to the pump body cavity and the side away from the pump body cavity. It should be noted that the support ring 1225 is plastic-coated inside the shielding sleeve at one end close to the pump body cavity.

[0045] In an alternative embodiment, please refer to Figure 4 The pump module includes a pump cover housing 1311 and an oil pump component 1312. The oil pump component 1312 is located in the pump body cavity, and a receiving cavity and a medium passage are formed inside the pump module; when a receiving cavity is formed inside the pump cover housing 1311, the oil pump component 1312 is located in the receiving cavity. In the embodiment of the present invention, in order to realize the gap compensation during the working process, please combine Figure 5 For reference, the oil pump component 1312 has an axial compensation structure 21 and a radial compensation structure 22; the axial compensation structure 21 is used to achieve axial clearance compensation of the oil pump component when the four-quadrant working internal gear pump is working; the radial compensation structure 22 is used to reduce the radial clearance of the oil pump component when the four-quadrant working internal gear pump is working.

[0046] Next, combine Figure 5 , the axial compensation structure and the radial compensation structure involved in the embodiment of the present invention are described: In an optional embodiment, the axial compensation structure 21 includes an axial plate 211, and the radial compensation structure 22 includes an oil distribution plate 221 and an oil distribution plate frame 222; at least one through hole is opened on the axial plate 21; the surface of the oil distribution plate frame 222 includes at least one slot, and the number of through holes corresponds to the number and position of the slots; the slotted surfaces of the oil distribution plate 221 and the oil distribution plate frame 222 are fitted to form an oil passage. When the four-quadrant working internal gear pump is working, the medium passes through the passage formed by the through hole and the oil passage.

[0047] In this case, the axial plate 21 is implemented as an axisymmetric structure; the axial plate 21 includes a first through hole 211, a second through hole 212, a third through hole 213, a fourth through hole 214 and a sinking groove 215; the first through hole is located at the axis of the axisymmetric structure, and the first through hole is implemented as an axisymmetric shape for positioning and installation. In practical applications, the first through hole can be implemented as a circular through hole for matching the axis of the stop pin 223; the number of the sinking groove, the second through hole and the third through hole is two, and they are distributed in an axisymmetric manner; the second through hole and the third through hole are located inside the sinking groove; the sinking groove has a connecting portion, and the connecting portion is used to pass the medium; the second through hole and the third through hole are used to connect the oil inlet and outlet of the pump cover; the fourth through hole is located at the axis of the axisymmetric structure, and the fourth through hole forms a passage for the leakage medium to flow when the pump head component is working. In an optional embodiment, the number and position of the oil distribution plate and the oil distribution plate frame correspond to the sinking groove, and the radial compensation structure also includes a stop pin 223. The stop pin 223 contacts the oil distribution plate 221 and the oil distribution plate frame 222 to support the oil distribution plate 221 and the oil distribution plate frame 222. The stop pin is used to limit the relative displacement of the oil distribution plate and the oil distribution plate frame.

[0048] It should be noted that, in the embodiment of the present invention, a medium exchange port for main oil circuit circulation, a one-way valve for realizing internal circulation and a corresponding one-way valve mounting hole are designed. Figure 6 FIG. 1 is a top view of a pump cover provided by an exemplary embodiment of the present invention. That is, in the embodiment of the present invention, the pump module 130 includes a pump cover housing 1311, a medium exchange port 321 and a one-way valve 3212; The medium exchange port 321 is located at the top of the pump cover housing 1311, and the medium exchange port 321 is used to exchange the medium for the motor pump to work; When the pump module 130 is working, a high-pressure pump cover chamber 240 and a low-pressure pump cover chamber 250 are formed in the pump module 130 ; The one-way valve 3212 is used to selectively transfer the high-pressure medium leaking in the medium passage from the high-pressure pump cover chamber 240 to the low-pressure pump cover chamber 250 .

[0049] In some embodiments of the present invention, please refer to Figure 4 as well as Figure 6 There are two medium exchange ports 321 on the pump cover housing 1311, which are used to adapt to the entry and output of the medium in the main oil circuit.

[0050] Two one-way valve mounting holes 3213 are designed on the pump cover. The two one-way valve mounting holes 3213 are designed in the same plane and can be designed to be 180° or to be an obtuse angle. That is, the oil passages formed by the two one-way valve mounting holes 3212 can be parallel to each other or form an angle. Optionally, the angle can be formed as at least one of an acute angle and an obtuse angle. In a preferred case, in order to make the structure compact, the angle is implemented as an obtuse angle. One end of the one-way valve mounting hole 3212 is connected to the pump cover volume chamber 210; the other end is respectively designed with a plug 3214 for sealing. The one-way valve mounting hole and the pump cover cavity form a medium passage, which is adapted to the function of the one-way valve, and selectively transports the high-pressure cutoff leaking in the medium passage from the high-pressure pump cover cavity to the low-pressure pump cover cavity. Optionally, the present application does not limit the form of the medium passage, such as Figure 4 As shown, the medium passage can be realized as a straight oil passage.

[0051] For the setting method of the check valve, please refer to Figure 7 In the embodiment of the present invention, under the schematic diagram of the high-pressure oil chamber 240 and the low-pressure oil chamber 250 as shown in the figure, after the high-pressure oil chamber leaks, the high-pressure medium enters the pump body chamber 220, and is transferred to the rotor chamber 230 through the pump body chamber 220, and enters the oil channel formed in the hollow motor shaft from the end of the rotor chamber 230 away from the pump cover, and enters the pump cover chamber 210 through the motor shaft. After entering the pump cover chamber, it enters the low-pressure oil chamber 250 through the oil channel where the one-way valve 3212 is located, so that a cavity capable of forced convection heat exchange is formed inside the motor pump structure, thereby realizing forced convection heat exchange. In this process, the pump cover chamber 210 will continue to maintain a low pressure.

[0052] To realize the above oil circuit design, please refer to the embodiment of this application. Figure 8 as well as Fig. 9 , as Figure 8 As shown, when the motor shaft is connected to the pump body cavity, the shaft sleeve configured for the motor shaft has an oil groove 3215. Fig. 9 As shown in the figure, when the motor shaft is connected to the pump cover cavity, the shaft sleeve configured for the motor shaft is not provided with an oil groove. The purpose of this design is to not provide an oil channel design in the pump cover cavity to reduce the flow of the medium into the pump cover cavity, so that the medium flows into the rotor cavity and enters the forced convection cycle, thereby achieving further efficient heat dissipation. In the pump body cavity, the medium can pass through the oil groove to form a passage inside the pump body cavity.

[0053] In an optional embodiment, the one-way valve is interference-fitted with the one-way valve mounting hole; or, the one-way valve is threadedly connected with the one-way valve mounting hole. Correspondingly, the one-way valve is provided with a sealing ring; the sealing ring contacts the one-way valve and the medium exchange port; the sealing ring is used to reinforce the connection between the one-way valve and the medium exchange port.

[0054] That is, in some application scenarios, two one-way valves are designed on the pump cover, and the one-way valve and the pump cover can be designed to be threaded or interference fit, preferably threaded fit, and are designed with sealing O-rings for easy assembly and maintenance.

[0055] The above are only optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor pump, characterized in that: The motor pump comprises a controller module, a motor module and a pump module; The controller module is used to send a driving signal to the motor module to drive the pump module; The controller module includes a controller housing and a controller assembly; The motor module includes a motor housing and a motor assembly; The pump module comprises a pump cover and a pump body; The controller component is electrically connected to the motor component; The motor assembly is connected to the pump body; The pump body is partially located inside the motor housing, the pump cover protrudes from the motor housing, and the pump module is coaxially connected to the motor module; The controller housing is stacked with the motor housing; A pump cover cavity and a pump body cavity are formed inside the pump module; The pump body and the motor housing form a motor rotor cavity; The pump cover cavity, the pump body cavity and the motor rotor cavity are used to form a medium passage, and the medium flows into the motor rotor cavity through the pump body cavity to achieve forced convection heat exchange.

2. The motor pump according to claim 1, characterized in that: The motor housing and the controller housing are implemented as an integrated housing; A first chamber, a second chamber and a third chamber are formed inside the integrated shell; The first chamber is used to accommodate the motor assembly and the pump body; The second chamber is used to accommodate the controller component; The third chamber is used to accommodate external devices.

3. The motor pump according to claim 2, characterized in that: The motor assembly comprises a motor shaft and a motor rotor; The motor shaft penetrates into the pump body; The motor rotor is connected to the motor shaft and is used to drive the motor shaft; The first end of the motor shaft is connected to the pump body for driving the gear of the pump body; The end of the second end of the motor shaft is used for speed signal excitation.

4. The motor pump according to claim 3, characterized in that: The motor assembly further includes a sliding bearing for supporting the first end of the motor shaft.

5. The motor pump according to claim 3, characterized in that: The motor assembly also includes a shielding sleeve, a sealing ring and a supporting ring; The shielding sleeve, the motor coil and the support ring are located inside the first chamber; The shielding sleeve is used to seal the rotor cavity in the first cavity; The sealing ring is located at the connection between the shielding sleeve, the pump body and the inner surface of the first chamber; The supporting ring is used to support the shielding sleeve; There is a supporting ring at each of the two ends of the shielding sleeve, wherein the supporting ring close to the pump body is plastic-coated in the shielding sleeve.

6. The motor pump according to claim 2, characterized in that: The motor shaft is implemented as a hollow motor shaft; When the motor pump moves, the medium flows from the second end of the motor shaft to the first end of the motor shaft; When the motor shaft is connected to the pump body cavity, the shaft sleeve configured for the motor shaft has an oil groove.

7. The motor pump according to claim 2, characterized in that: The pump module includes a pump cover housing, a medium exchange port and a one-way valve; The medium exchange port is located at the top of the pump cover housing, and the medium exchange port is used to exchange the medium for the motor pump to work; When the pump module is working, a high-pressure pump cover cavity and a low-pressure pump cover cavity are formed in the pump module; The one-way valve is used to selectively transport the high-pressure medium leaking in the medium passage from the high-pressure pump cover chamber to the low-pressure pump cover chamber.

8. The motor pump according to claim 7, characterized in that: The number of the medium exchange port and the number of the oil port are both 2; The pump cover shell is provided with a one-way valve mounting hole; The one-way valve is located in the one-way valve installation hole; The one-way valve installation hole and the pump cover cavity form a medium passage; The one-way valve is provided with a one-way valve plug, and the one-way valve plug is located in the one-way valve installation hole.

9. The motor pump according to claim 8, characterized in that: The oil passages formed by the two one-way valve mounting holes are parallel to each other; or, The oil passages formed by the two one-way valve mounting holes form an angle.

10. The motor pump according to claim 2, characterized in that: The external device includes at least one of an external wire and a rotation speed sensor.

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