CN219672928U - Electronic water pump and vehicle - Google Patents

Abstract

The utility model discloses an electronic water pump and a vehicle, wherein the electronic water pump comprises a motor shell and a pump shell, the motor shell is provided with a motor cavity, a first end and a second end which are opposite to each other are formed on the shell, a water inlet flow channel is formed on the shell wall of the motor shell, the pump shell is arranged at the first end, a pump cavity is formed between the first end and the motor shell, the water inlet flow channel, the pump cavity and the motor cavity are communicated with each other to form a flow path for cooling water circulation, at least one water inlet is formed on the end face of the first end, the water inlet flow channel receives cooling water from the pump cavity through the water inlet, 50% of peak water pressure of the end face of the first end is preset water pressure, and the water pressure of the at least one water inlet is larger than or equal to the preset water pressure. The technical scheme of the utility model aims to cool the motor through a cooling flow path of the motor so as to ensure the working performance of the electronic water pump.

Description

Electronic water pump and vehicle

Technical Field

The utility model relates to the field of water pumps, in particular to an electronic water pump and a vehicle.

Background

The electronic water pump is widely used in cooling systems of conventional power and new energy vehicle types and provides power for circulation of cooling liquid in the cooling system so as to improve cooling efficiency of the cooling system. However, when the running power of the electronic water pump is large, the heating value of the motor coil is very high, so that the motor temperature of the electronic water pump is excessively high, and the working performance of the electronic water pump is affected.

Disclosure of Invention

The utility model mainly aims to provide an electronic water pump, which aims to cool a motor through a cooling flow path of the motor so as to ensure the working performance of the electronic water pump.

In order to achieve the above object, the present utility model provides an electronic water pump, comprising:

a motor casing having a first end and a second end opposite to each other, a motor cavity formed therein, and a water inlet flow passage formed in a casing wall of the motor casing; and

the pump shell is arranged at the first end, and a pump cavity is formed between the first end and the motor shell;

the water inlet flow passage, the pump cavity and the motor cavity are communicated with each other in pairs to form a flow path for cooling water circulation;

the end face of the first end is provided with at least one water inlet, and the water inlet flow channel receives cooling water from the pump cavity through the water inlet;

the peak water pressure of the end face of the first end is 50% of the preset water pressure, and the water pressure of at least one water inlet is greater than or equal to the preset water pressure.

Optionally, the electronic water pump further comprises an impeller arranged in the pump body cavity, an annular space is formed between the periphery of the impeller and the periphery of the pump body cavity, and the water inlet is arranged opposite to the annular space.

Optionally, the electronic water pump further comprises a rotor rotatably arranged in the motor cavity, wherein one end of the rotor is provided with a mounting plate, the mounting plate protrudes out of the end face of the first end, the impeller is mounted on the mounting plate, and a space is reserved between the periphery of the mounting plate and the periphery of the pump body cavity, so that the annular space extends to the end face of the first end.

Optionally, the electronic water pump further comprises a rotating shaft fixedly arranged in the motor cavity, the rotor is rotatably sleeved on the rotating shaft, a third cooling flow passage is formed between the rotor and the rotating shaft, and two ends of the third cooling flow passage are respectively communicated with the motor cavity and the pump body cavity.

Optionally, the impeller is installed in the side of mounting panel that deviates from first end, the impeller is formed with the intercommunication the impeller runner in pump body chamber, the pivot runs through the mounting panel sets up, so that the third cooling runner intercommunication in the impeller runner.

Optionally, the water inlets are provided in plurality, and at least part of the water inlets have water pressure greater than or equal to the preset water pressure.

Optionally, a plurality of water inlet channels are provided, and one water inlet channel is communicated with the pump cavity through one water inlet.

Optionally, the water inlet is provided with a diversion cone.

Optionally, the contour of the water inlet is circular or polygonal.

Optionally, the electronic water pump further comprises a control assembly arranged at the second end, the control assembly comprises a control board and an electric control piece, the electric control piece is arranged on one side of the control board, and cooling water can flow through the other side of the control board when circulating.

Optionally, the motor casing includes a casing peripheral wall and a partition board connected to the casing peripheral wall, two ends of the casing peripheral wall are the first end and the second end respectively and are located at two opposite sides of the partition board respectively, the water inlet flow channel is located in the casing peripheral wall, and the motor cavity is located at one side of the partition board close to the first end;

a first cooling flow passage is formed between the control plate and the partition plate, water passing holes are formed in the partition plate, and the first cooling flow passage is communicated with the motor cavity through the water passing holes.

Optionally, the water inlet flow channel extends to one side of the partition board near the second end, and penetrates through the inner peripheral side of the peripheral wall of the shell to be communicated with the first cooling flow channel, so that the first cooling flow channel can be used for water inlet from the water inlet flow channel and water outlet from the motor cavity.

The utility model further provides a vehicle, which comprises the electronic water pump.

According to the technical scheme, part of cooling water in the pump body cavity can enter the water inlet flow channel through the water inlet, the part of cooling water has certain pressure and can flow to the motor cavity along the water inlet flow channel, and in the motor cavity, the rotation of the rotor can drive the cooling water to flow to the pump body cavity, so that a circulating cooling flow channel can be formed among the pump body cavity, the water inlet flow channel and the motor cavity. And the water pressure of at least one water inlet is more than or equal to 50% of the peak water pressure of the end face of the first end, so that the water pressure of cooling water in the water inlet flow channel is guaranteed, and the circulating power of the cooling flow channel is guaranteed. Therefore, the cooling water flows through the cooling flow path, so that the rotor, the stator and the control board of the motor can be cooled, heat of the stator and the rotor is carried through the cooling water, overhigh temperature rise of the motor coil caused by accumulation of heat can be avoided, the working performance of the motor is guaranteed, and the working performance of the electronic water pump is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an assembly structure of an embodiment of an electronic water pump of the present utility model;

FIG. 2 is a schematic diagram of an explosion structure of an embodiment of an electronic water pump according to the present utility model;

FIG. 3 is a schematic cross-sectional view of an embodiment of an electronic water pump according to the present utility model;

FIG. 4 is a schematic diagram of a motor casing of an electronic water pump according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a motor casing of an electronic water pump according to an embodiment of the present utility model at another view angle;

fig. 6 (a) is a schematic diagram of an embodiment of an electronic water pump according to the present utility model, and fig. 6 (b) is a flow chart corresponding to fig. 6 (a).

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

The terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" is presented throughout this document, it is intended to include three schemes in parallel, taking "a and/or B" as an example, including a scheme, or B scheme, or a scheme where a and B meet simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides an electronic water pump.

In an embodiment of the present utility model, as shown in fig. 1 to 3, the electronic water pump includes:

a motor casing 100 having opposite first and second ends 101 and 102 and formed with a motor cavity 103, and a casing wall of the motor casing 100 formed with a water inlet flow passage 104; and

a pump case 200 provided at the first end 101 and having a pump body chamber 210 formed between the first end 101 and the motor case 100;

the water inlet channel 104, the pump body cavity 210 and the motor cavity 103 are communicated with each other to form a flow path for cooling water circulation;

the end face of the first end 101 is provided with at least one water inlet 105, and one end of the water inlet channel 104 receives cooling water from the pump body cavity 210 through the water inlet 105;

the peak water pressure of the end face of the first end 101 is 50% of the preset water pressure, and the water pressure of at least one water inlet 105 is greater than or equal to the preset water pressure.

It can be understood that the motor cavity 103 is fixedly provided with a rotating shaft 530, the rotor 510 is rotatably sleeved outside the rotating shaft 530, and the stator 400 is sleeved outside the rotor 510 and fixedly arranged on the motor casing 100. The pump case 200 is provided with a water inlet pipe 201 and a water outlet pipe 202, an impeller 600 is arranged in the pump body cavity 210, a rotor 510 is in driving connection with the impeller 600, cooling water enters the pump body cavity 210 from the water inlet pipe 201, and the rotor 510 rotates, namely drives the impeller 600 to rotate in the pump body cavity 210 so as to pressurize the cooling water in the pump body cavity 210, so that the pressure of the water flow flowing out of the water outlet pipe 202 of the pump case 200 is increased, and power is provided for circulation of the cooling water in a cooling system of a vehicle.

In the technical solution of the present utility model, part of cooling water in the pump body cavity 210 can enter the water inlet channel 104 through the water inlet 105, the part of cooling water has a certain pressure, and can flow along the water inlet channel 104 to the motor cavity 103, and in the motor cavity 103, the rotation of the rotor 510 can drive the cooling water to flow to the pump body cavity 210, so that a circulating cooling flow path can be formed among the pump body cavity 210, the water inlet channel 104 and the motor cavity 103. And the water pressure of the at least one water inlet 105 is greater than or equal to 50% of the peak water pressure of the end face of the first end 101, which is beneficial to guaranteeing the water pressure of the cooling water in the water inlet flow passage 104 so as to guarantee the circulating power of the cooling flow passage. Therefore, the cooling water flows through the cooling flow path, so that the rotor 510 and the stator 400 of the motor can be cooled, generated heat of the stator 400 and the rotor 510 is carried through the cooling water, excessive temperature rise of a motor coil caused by accumulation of heat can be avoided, the working performance of the motor can be guaranteed, and the working performance of the electronic water pump can be guaranteed. The water inlet passage 104 may be formed by a wall structure of the motor case 100, or the motor case 100 may be provided with a cavity structure, and the water inlet passage 104 may be formed in a duct by inserting the duct into the cavity.

In the technical scheme of the utility model, when the water inlet flow channel 104 is designed, the electronic water pump can be firstly subjected to simulation to obtain a flow curve of the end face of the first end 101, then the preset flow corresponding to the preset water pressure is obtained according to the flow-water pressure corresponding relation of the electronic water pump, and the positions where the flow is greater than or equal to the preset flow are obtained on the flow curve, wherein the water pressures corresponding to the positions are greater than or equal to the preset water pressure, and it can be understood that the corresponding relation is influenced by the internal structure of the electronic water pump, and the electronic water pumps with different structures have different flow and water pressure corresponding relations. Without loss of generality, in the simulation diagram shown in fig. 6 (a), the tangential point of the water outlet pipe 202, that is, point 1 is selected as a reference point, a plurality of points are circumferentially taken at intervals, the flow rates of the points are simulated, and finally, the flow rate curve in fig. (b) is fitted. In the flow curve, the abscissa is from point 1 to point 9 shown in the graph (a), the area between point 2 and point 5 corresponding to the flow value in the dashed frame is the area meeting the preset water pressure, and at least one water inlet 105 is arranged in the area, so that the circulation power of the cooling flow path is guaranteed.

Further, in this embodiment, a plurality of water inlets 105 are provided, and at least a part of water inlets 105 have a water pressure greater than or equal to the preset water pressure. It can be appreciated that, in the plurality of water inlets 105 of this embodiment, some water inlets are disposed at a position where the water pressure is greater than or equal to the preset water pressure, and some water inlets are disposed at a position where the water pressure is less than the preset water pressure, where the water pressure at the set position of at least two water inlets 105 is greater than or equal to the preset water pressure, so that the water inlet pressure of more water inlets 105 is at a higher level, so as to further improve the circulation power of the cooling flow channel, thereby guaranteeing the heat dissipation effect of the cooling water on the structure of the motor.

Further, in this embodiment, a plurality of water inlet channels 104 are provided, and one water inlet channel 104 is connected to the pump body cavity 210 through one water inlet 105. In this way, the water inlet efficiency of the cooling flow channel can be improved, and more cooling water can enter the cooling flow channel through the water inlet flow channel 104, so that the cooling effect on the motor is improved. Specifically, as shown in fig. 3 and fig. 4, the water inlet 105 is provided with a diversion cone 108 to guide the cooling water to enter, the taper of the diversion cone 108 can be adaptively adjusted according to the aperture of the water inlet hole and the position of the water inlet 105 on the end face of the first end 101, and the contour of the water inlet 105 can also be adaptively adjusted according to the above conditions, and can be in a shape of a polygon such as a circle, a triangle, a square, etc.

Further, in the present embodiment, as shown in fig. 2 and 3, the electronic water pump further includes an impeller 600 disposed in the pump chamber 210, an annular space 211 is provided between an outer periphery of the impeller 600 and a periphery of the pump chamber 210, and the water inlet 105 is disposed opposite to the annular space 211. In this way, after the cooling water flows out of the impeller flow channel 610, the cooling water reaches the annular space 211, and the position of the water inlet 105 is opposite to the annular space 211, so that the water inlet 105 can have enough cooling water to enter, which is beneficial to guaranteeing the water inlet flow of the water inlet 105, so as to guarantee the cooling effect of the cooling water on the motor in the cooling flow channel.

Further, in the present embodiment, as shown in fig. 2 and 3, a mounting plate 520 is disposed at one end of the rotor 510, and the mounting plate 520 protrudes from the end face of the first end 101, the impeller 600 is mounted on the mounting plate 520, and a space is provided between the outer periphery of the mounting plate 520 and the periphery of the pump chamber 210, so that the annular space 211 extends to the end face of the first end 101. Thus, the installation plate 520 can enable the impeller 600 to be stably connected to the rotor 510, and cannot influence the water inflow of the water inlet 105, so that the water inflow of the water inlet 105 is further ensured, and the heat dissipation effect of cooling water is further ensured.

Further, in this embodiment, the electronic water pump further includes a control assembly 300 disposed at the second end 102, the control assembly 300 includes a control board 310 and an electric control 320, the electric control 320 is installed on one side of the control board 310, and the cooling water can flow through the other side of the control board 310 when circulating. Without loss of generality, the motor of the electronic water pump is a brushless motor, and the current steering of the coils of the stator 400 is controlled through the electric control 320, so that the rotor 510 continuously rotates around the rotating shaft 530. In the working process of the motor, the heating value of the electric control 320 is large, and when cooling water circularly flows in the cooling flow path, cooling water can flow through the control board 310 so as to take away the heat transferred to the control board 310 by the electric control 320, so that the electric control 320 is prevented from being excessively high in temperature rise due to heat accumulation, the working performance of the electric control 320 is guaranteed, and the working performance of the electronic water pump is guaranteed.

Further, in this embodiment, the motor casing 100 includes a casing circumferential wall 110 and a partition 120 connected to the casing circumferential wall 110, two ends of the casing circumferential wall 110 are the first end 101 and the second end 102 respectively, and are located at two opposite sides of the partition 120 respectively, the water inlet channel 104 is located in the casing circumferential wall 110, the motor cavity 103 is located at one side of the partition 120 near the first end 101, a first cooling channel 11 is formed between the control board 310 and the partition 120, the partition is provided with a water passing hole 121, and the first cooling channel 11 is communicated with the motor cavity 103 through the water passing hole 121. The rotating shaft 530 is fixedly arranged on the partition board 120 to stably support the rotor 510, so that the rotor 510 rotates stably. Specifically, the heat generated by the operation of the electric control element 320 is transferred to the control plate 310, the cooling water enters the second cooling flow channel to exchange heat with the surface of the control plate 310, so that the temperature of the control plate 310 and the electric control element 320 can be reduced, the control plate 310 plays a role in increasing the heat dissipation area, and the heat dissipation effect of the cooling water is improved. Of course, in other embodiments, the motor casing may be provided without a partition, the control board is disposed at the second end, and the rotating shaft is fixedly disposed on the control board.

Further, in the present embodiment, the water inlet channel 104 extends to a side of the partition 120 near the second end 102 and penetrates through an inner peripheral side of the shell peripheral wall 110 to be communicated with the first cooling channel 11, so that the first cooling channel 11 can be used for water inlet from the water inlet channel 104 and water outlet from the motor cavity 103. Wherein, the extending direction of the water inlet channel 104 is parallel to the axial direction of the rotating shaft 530. In this embodiment, the cooling water in the pump cavity 210 flows into the water inlet channel 104, and the first cooling channel 11 sequentially passes through the motor cavity and returns to the pump cavity 210. In this way, the water outlet 106 of the water inlet channel 104 can be closer to the control board 310, and the heat exchange between the cooling water and the control board 310 can precede the heat exchange between the cooling water and the structure in the motor cavity 103, so that a better cooling effect can be achieved on the control board 310. Of course, in other embodiments, the cooling water may flow through the motor cavity 103 first and then flow into the first cooling flow channel 11.

Further, in this embodiment, a mounting cavity is provided in the casing peripheral wall 110, the stator 400 is fixedly disposed in the mounting cavity, and a second cooling flow channel is formed between the rotor 510 and the casing peripheral wall 110. It can be appreciated that the rotor 510 is in clearance fit with the motor housing 100 or the rotating shaft 530, wherein the outer peripheral side of the rotor 510 is in clearance fit with the housing peripheral wall 110 to form a second cooling flow passage, which is a space in the motor cavity 103, and thus can be communicated with the pump cavity 210 on a side close to the first end 101 and communicated with the water passing hole 121 on a side close to the second end 102; the inner circumferential side of the rotor 510 is clearance-fitted with the rotation shaft 530 to form a third cooling flow path; the end surface of the rotor 510 near the second end 102 is in clearance fit with the partition 120 to form a fourth cooling flow passage 12, and the third cooling flow passage has two end portions distributed along the axial direction of the rotating shaft 530, and the end portion of the third cooling flow passage near the second end 102 communicates with the fourth cooling flow passage 12. The cooling water flowing out of the water passing holes 121 of the partition plate 120 is partially flowed into the second cooling flow path by the rotation of the rotor 510, and partially flowed into the third cooling flow path through the fourth cooling flow path 12. It will be understood that the cooling water flowing into the second cooling flow passage cools the outer circumference of the rotor 510, and the cooling of the stator 400 is achieved by cooling the inner circumference of the casing circumferential wall 110, the cooling water flowing into the third cooling flow passage cools the inner circumference of the rotor 510 and the outer circumference of the rotating shaft 530, and the cooling water flowing into the fourth cooling flow passage 12 cools the end surface of the rotor 510, so that each component of the motor can be effectively cooled to ensure the working performance of the electronic water pump. Of course, in other embodiments, the stator 400 may be fixedly mounted to the inner peripheral side of the partition plate 120 or the case peripheral wall 110.

Further, in the present embodiment, as shown in fig. 3, the end of the third cooling flow passage near the first end 101 is further connected to the pump body cavity 210, and thus, two circulation flow paths are formed in the pump body cavity 210, the water inlet flow passage 104 and the water passing cavity, that is, the cooling flow paths include a first circulation flow path and a second circulation flow path, which have a common flow path, that is, a flow path sequentially passing through the water inlet flow passage 104, the first cooling flow passage 11 and the water passing hole 121 from the pump body cavity 210, in the first circulation flow path, at the rear end of the water passing hole 121, the cooling water returns to the pump body cavity 210 via the second cooling flow passage, and in the second circulation flow path, at the rear end of the water passing hole 121, the cooling water returns to the pump body cavity 210. In this embodiment, after exchanging heat with each component of the motor, the cooling water with higher temperature can return to the pump cavity 210, and the cooling water flowing in again is new cooling water in the pump cavity 210, so that the temperature of the cooling water is lower, and the cooling effect of the cooling water can be improved through the circulation of the cooling water, which is beneficial to guaranteeing the working performance of the motor, thereby guaranteeing the working performance of the electronic water pump. And through the public flow path of design first circulation flow path and second circulation flow path for the space that the circulation flow path took is littleer, and the structure of motor casing 100 is simpler, is favorable to reducing the volume of electronic water pump, reduces manufacturing cost and promotes production efficiency.

Specifically, the impeller 600 is mounted on a side of the mounting plate 520 away from the first end 101, the impeller 600 is formed with an impeller flow channel 610 that communicates with the pump body cavity 210, and the rotating shaft 530 penetrates through the mounting plate 520, so that the third cooling flow channel communicates with the impeller flow channel 610. That is, the second cooling flow passage will be connected to the pump body cavity 210 at the side of the mounting plate 520 near the second end 102, and the third cooling flow passage will be connected to the pump body cavity 210 at the side of the mounting plate 520 far away from the second end 102, so that the first circulation flow passage and the second circulation flow passage are connected to different positions of the pump body cavity 210 through different paths, and the cooling water after heat exchange can flow to the pump body cavity 210 through different paths, thus, the diffusion of the cooling water after heat exchange in the pump body cavity 210 can be promoted, the aggregation of the cooling water with too high temperature at the first end 101 can be avoided, the cooling effect of the cooling water on the motor can be ensured, and the working performance of the electronic water pump can be ensured. Of course, in other embodiments, the end of the third cooling flow channel near the first end 101 is also connected to the motor cavity 103, so as to be connected to the pump body cavity 210 through the motor cavity 103.

Further, in the present embodiment, as shown in fig. 3, the control plate 310 is sealingly engaged with the inner periphery of the casing peripheral wall 110, and the water outlet 106 of the water inlet channel 104 is provided in the inner periphery of the casing peripheral wall 110. Without losing generality, the control panel 310 is provided with an annular sealing groove, a sealing ring 330 is installed in the sealing groove, and sealing installation of the control panel 310 is realized through matching of the sealing ring 330 and the inner periphery of the shell peripheral wall 110 so as to avoid the cooling water of the second cooling flow channel from being exposed. The water inlet flow passage 104 penetrates through the inner peripheral side of the shell peripheral wall 110 to penetrate through the second end 102, so that the water inlet flow passage 104 can be communicated with the second cooling flow passage, and cooling water can enter the second cooling flow passage to cool the control plate 310. In addition, a diversion runner 122 is further disposed on one side of the partition plate 120 away from the first end 101, an inlet of the diversion runner 122 is disposed opposite to the water outlet 106 of the water inlet runner 104, and an outlet of the diversion runner 122 is communicated with the water passing hole 121, so as to guide cooling water from the water outlet 106 of the water inlet runner 104 to the water passing hole 121, and ensure that the cooling water flows from the first cooling runner 11 to the motor cavity 103. Specifically, the flow guide passage 122 is configured by two flow guide ribs 123. Of course, in other embodiments, the control plate 310 may be sealingly engaged with the end surface of the second end 102 of the shell peripheral wall 110, and the water outlet 106 of the water inlet channel 104 may be disposed on the end surface of the second end 102 and be communicated with the second cooling channel through a flow guiding structure disposed on the control plate 310.

Further, in the present embodiment, the water passing hole 121 is provided opposite to the second cooling flow passage so that the cooling water flows to the second cooling flow passage through the water passing hole 121, wherein the cooling water flowing in from the water passing hole 121 will flow to the third cooling flow passage through the fourth cooling flow passage 12 in part. In this way, in the second circulation flow path, at the rear end of the water passing hole 121, the cooling water will flow to the third cooling flow path through the fourth cooling flow path 12. Without loss of generality, as shown in fig. 4, the water passing holes 121 are formed at the connection part of the partition plate 120 and the shell peripheral wall 110, and the water passing holes 121 are provided with a plurality of water passing holes 121 distributed along the circumferential direction, the shell peripheral wall 110 is formed with a plurality of water passing grooves 107 correspondingly communicated with the water passing holes 121, the water passing grooves 107 penetrate through the first end 101 to form a second cooling flow channel between each water passing groove 107 and the outer peripheral side of the rotor 510, and thus, the cooling effect on the rotor 510 and the stator 400 can be improved through the arrangement of the plurality of second cooling flow channels.

Further, in this embodiment, the casing peripheral wall 110 is provided with a plurality of mounting cavities distributed along the circumferential direction, a plurality of mounting cavities and a plurality of water inlet channels 104 are disposed in a one-to-one correspondence, and the stator 400 includes a plurality of sub-portions, one of which is correspondingly mounted in one of the mounting cavities. It will be appreciated that the inlet flow passage 104 and the mounting cavity are not in communication with each other, and the operation of the stator 400 is not affected, and the heat of the stator 400 is transferred to the wall adjacent to the mounting cavity. In this embodiment, the water inlet flow channel 104 is disposed opposite to the installation cavity, and the cooling water flows through the water inlet flow channel 104, so that the wall body near the installation cavity can be cooled, which is favorable for promoting the heat dissipation of the stator 400, avoiding the excessive temperature rise of the stator 400 caused by heat accumulation, and further, the water inlet flow channel 104 is provided with a plurality of sub-portions, which can provide cooling effect for the plurality of sub-portions in a one-to-one correspondence manner, so that the temperature distribution of the stator 400 at the periphery is uniform, and the working performance of the motor is ensured.

Further, in the present embodiment, as shown in fig. 3, the water inlet channel 104 is disposed on a side of the stator 400 facing away from the rotor 510. In this way, the cooling water in the water inlet channel 104 can exchange heat with the shell circumferential wall 110 on the outer circumferential side of the stator 400 to cool the stator 400, and the water inlet channel 104 is further arranged to penetrate through the inner circumference of the shell circumferential wall 120, so that the water inlet channel 104 has a part opposite to the end face of the stator 400, and the cooling water can cool the end face of the stator 400 when flowing through the water inlet channel 104 of the part. Of course, in other embodiments, a water inlet channel 104 may be disposed between every two adjacent sub-portions of the stator 400.

Further, in the present embodiment, as shown in fig. 3, the stator 400 is disposed opposite to the first cooling flow passage 11. In this way, when the cooling water flows through the first cooling flow channel 11, the cooling water can cool the end face of the stator 400 while radiating the heat from the control board 310, so that the cooling effect of the stator 400 is further improved.

Without loss of generality, as shown in fig. 3, the motor casing 100 includes a stator injection molding body 130 and a casing injection molding body 140, and is formed through two injection molding processes, the stator injection molding body 130 formed through an insert injection molding mode at least partially encapsulates the stator 400, and then the casing injection molding body 140 encapsulating the stator injection molding body 130 is formed through two injection molding processes, so that a mounting cavity is formed in the casing peripheral wall 110, by using the two injection molding modes, the strength of the motor casing 100 can be ensured, the material cost can be saved, the volume of the stator injection molding body 130 is smaller, the injection molding time is shortened, damage to components such as windings of the stator 400 can be avoided during injection molding, and the performance reliability of the electronic water pump is ensured. The water inlet channel 104 is provided in the housing injection molding body 140, and may be formed in the housing injection molding body 140 together in the case of secondary injection molding, or may be formed by reworking after injection molding of the housing injection molding body 140 is completed. In addition, the second end 102 of the motor casing 100 is further provided with a motor cover 700, and the control assembly 300 is positioned between the motor cover 700 and the partition 120 of the motor casing 100 to provide protection for the electric control unit 320 through the motor cover 700.

The utility model also provides a vehicle, which comprises the electronic water pump, and the specific structure of the electronic water pump refers to the embodiment, and because the vehicle adopts all the technical schemes of all the embodiments, the vehicle has at least all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (13)

1. An electronic water pump, comprising:

a motor casing having a first end and a second end opposite to each other, a motor cavity formed therein, and a water inlet flow passage formed in a casing wall of the motor casing; and

the pump shell is arranged at the first end, and a pump cavity is formed between the first end and the motor shell;

the water inlet flow passage, the pump cavity and the motor cavity are communicated with each other in pairs to form a flow path for cooling water circulation;

the end face of the first end is provided with at least one water inlet, and the water inlet flow channel receives cooling water from the pump cavity through the water inlet;

the peak water pressure of the end face of the first end is 50% of the preset water pressure, and the water pressure of at least one water inlet is greater than or equal to the preset water pressure.

2. The electronic water pump of claim 1, further comprising an impeller disposed in the pump body cavity, an annular space being provided between an outer periphery of the impeller and a periphery of the pump body cavity, the water inlet being disposed relative to the annular space.

3. The electronic water pump of claim 2, further comprising a rotor rotatably disposed in the motor cavity, wherein a mounting plate is disposed at one end of the rotor and protrudes from the end face of the first end, wherein the impeller is mounted to the mounting plate with a space between an outer periphery of the mounting plate and a periphery of the pump body cavity such that the annular space extends to the end face of the first end.

4. The electronic water pump of claim 3, further comprising a rotating shaft fixedly arranged in the motor cavity, wherein the rotor is rotatably sleeved on the rotating shaft, a third cooling flow passage is formed between the rotor and the rotating shaft, and two ends of the third cooling flow passage are respectively communicated with the motor cavity and the pump body cavity.

5. The electronic water pump of claim 4, wherein the impeller is mounted on a side of the mounting plate facing away from the first end, the impeller is formed with an impeller runner in communication with the pump body cavity, and the shaft is disposed through the mounting plate such that the third cooling runner is in communication with the impeller runner.

6. The electronic water pump of claim 1, wherein the water inlet is provided in plurality, and at least a portion of the water inlet has a water pressure greater than or equal to the preset water pressure.

7. The electronic water pump of claim 6, wherein a plurality of water inlet channels are provided, one of the water inlet channels being in communication with the pump cavity through one of the water inlets.

8. The electronic water pump of claim 1, wherein the water inlet is provided with a diversion cone.

9. The electronic water pump of claim 1, wherein the water inlet is circular or polygonal in contour.

10. The electronic water pump of any one of claims 1 to 9, further comprising a control assembly provided at the second end, the control assembly comprising a control board and an electrical control member mounted to one side of the control board, the cooling water being circulated through the other side of the control board.

11. The electronic water pump of claim 10, wherein the motor housing includes a housing peripheral wall and a partition plate connected to the housing peripheral wall, the housing peripheral wall having the first end and the second end at opposite ends, the water inlet flow passage being provided in the housing peripheral wall, the motor chamber being located at a side of the partition plate adjacent to the first end;

a first cooling flow passage is formed between the control plate and the partition plate, water passing holes are formed in the partition plate, and the first cooling flow passage is communicated with the motor cavity through the water passing holes.

12. The electronic water pump of claim 11, wherein the water inlet channel extends to the second end and penetrates through the inner peripheral side of the peripheral wall of the housing to communicate with the first cooling channel, so that the first cooling channel can inlet water from the water inlet channel and outlet water to the motor cavity.

13. A vehicle comprising an electronic water pump according to any one of claims 1 to 12.