Electronic water pump

Abstract

The utility model relates to an electronic water pump. The electronic water pump comprises a pump body, a stator, a rotor and an impeller. The stator is fixedly arranged in the first cavity of the pump body. The rotor and the impeller are connected into a whole and are arranged in the second cavity of the pump body in a mode of rotating around an axis. The rotor is a magnet, the stator is a printed circuit board with a magnetic induction coil, and the axis passes through the center of the magnet and the center of the printed circuit board. The first chamber and the second chamber are separated by a partition wall, the partition wall comprises a first wall portion perpendicular to the axis, and the magnet and the printed circuit board are located on the two sides of the first wall portion respectively. The printed circuit board with the magnetic induction coil is used as the stator, so that the electronic water pump can obtain a smaller axial size. In addition, the printed circuit board is located in the first cavity, and the rotor and the impeller are located in the second cavity, so that the printed circuit board can be separated from the second cavity, namely, the printed circuit board is separated from the cavity where the fluid medium flows, and the stator can be prevented from being soaked in the fluid medium to be corroded and damaged.

Description

Technical Field

[0001] The present disclosure relates to the field of water pumps, and in particular, to an electronic water pump. Background Art

[0002] Electronic water pumps are widely used in automotive thermal management systems because they can accurately control the flow of fluid media according to demand. Electronic water pumps usually include a stator and a rotor. The stator generates a magnetic field to drive the rotor to rotate. The rotation of the rotor causes the impeller to start working, thereby driving the flow of the fluid medium.

[0003] However, conventional electronic water pumps mainly use stator windings, i.e. coil windings wound on the stator core, which makes it difficult to reduce the size of the electronic water pump in the axial direction. In addition, in conventional electronic water pumps, the fluid medium may corrode the stator, thereby affecting the reliability of the electronic water pump.

[0004] Therefore, there is a need in the relevant field to improve the electronic water pump so that it can obtain a smaller axial size and prevent the stator from being corroded by the fluid medium. Utility Model Content

[0005] In view of this, the present disclosure provides an electronic water pump, aiming to reduce the axial size of the electronic water pump while reducing the risk of corrosion damage to the stator.

[0006] The electronic water pump comprises a pump body, a stator, a rotor and an impeller. The stator is fixedly arranged in the first chamber of the pump body. The rotor and the impeller are connected as one body and are rotatably arranged in the second chamber of the pump body around an axis. The rotor is a magnet, and the stator is a printed circuit board with a magnetic induction coil. The above-mentioned axis passes through the center of the magnet and the center of the printed circuit board. The first chamber and the second chamber are separated by a partition wall. The partition wall comprises a first wall portion perpendicular to the axis, and the magnet and the printed circuit board are respectively located on both sides of the first wall portion.

[0007] Compared with a conventional electronic water pump having a stator core and a stator winding, the electronic water pump provided by the present disclosure adopts a stator implemented as a printed circuit board with a magnetic induction coil, which enables the electronic water pump provided by the present disclosure to obtain a smaller axial size. In addition, the printed circuit board is located in the first chamber, the rotor and the impeller are located in the second chamber, and the first chamber and the second chamber are separated by a partition wall. Therefore, the printed circuit board can be separated from the second chamber, that is, separated from the chamber where the fluid medium flows, which can prevent the stator from being immersed in the fluid medium and being corroded and damaged.

[0008] In a possible implementation, there is a first gap between the first wall portion and the magnet. The partition wall further includes a second wall portion parallel to the axis, there is a second gap between the second wall portion and the impeller, and the first gap is connected to the second gap.

[0009] The fluid medium flows through the first gap and the second gap, and exchanges heat with both the first wall portion and the second wall portion, which helps to improve the heat exchange efficiency between the fluid medium and the first chamber, thereby being able to dissipate heat from the stator more effectively.

[0010] In one possible implementation, the pump body includes a main body, which includes an outer cylinder portion, an end wall portion, a first wall portion and a second wall portion, the outer cylinder portion surrounds the second wall portion, the first wall portion extends between the outer cylinder portion and the second wall portion, and the end wall portion closes the rear end of the second wall portion.

[0011] According to this structure, only the front end and the rear end of the main body need to be closed respectively to form the first chamber and the second chamber separated from each other, which helps to simplify the complexity of the structure and the complexity of the assembly process of the electronic water pump.

[0012] In a possible implementation, the pump body further includes a front cover and a rear cover, and the main body cooperates with the front cover to form the second chamber, and cooperates with the rear cover to form the first chamber.

[0013] In this way, the front cover and the rear cover are mounted on the main body to form a first chamber and a second chamber, and the printed circuit board is located in the first chamber, and the rotor and the impeller are located in the second chamber, so that the printed circuit board can be separated from the chamber where the fluid medium flows.

[0014] In a possible implementation, the electronic water pump further includes a driving circuit board, and the driving circuit board is accommodated in the first chamber.

[0015] Since the first chamber and the second chamber are separated from each other, the fluid medium only exists in the second chamber, so the driving circuit board placed in the first chamber will be protected from being corroded by the fluid medium, which helps to improve the reliability and life of the electronic water pump. In addition, in this way, the stator and the driving circuit board are placed in the same chamber, which helps to reduce the structural complexity of the pump body.

[0016] In a possible implementation, the pump body further includes a third chamber connected to the second gap, and the partition wall further includes a third wall portion, which extends radially outward from the outer side of the second wall portion to separate the first chamber from the third chamber.

[0017] In this way, the fluid medium can flow through the first gap, the second gap and the third chamber in sequence. In this process, the fluid medium will go around the periphery of the first chamber and contact the first wall, the second wall and the third wall. In this way, the fluid medium can more fully exchange heat with the first chamber during the flow process, taking away more heat from the first chamber, thereby further improving the heat dissipation performance of the electronic water pump.

[0018] In one possible implementation, the pump body includes a main body, which includes an outer cylinder portion, a first wall portion and a second wall portion, the outer cylinder portion surrounds the second wall portion, the first wall portion extends between the outer cylinder portion and the second wall portion, and the inner periphery and outer periphery of the third wall portion are respectively detachably connected to the second wall portion and the outer cylinder portion.

[0019] In this way, when installing the printed circuit board, the printed circuit board can be placed in the space formed by the first wall, the second wall and the outer tube, and then the inner and outer peripheries of the third wall are respectively joined to the second wall and the outer tube, and then the front and rear ends of the main body are respectively closed to form the first chamber, the second chamber and the third chamber separated from each other. This method has many advantages such as simple structure and easy assembly and disassembly.

[0020] In a possible implementation, the pump body further includes a front cover and a rear cover, the main body and the front cover cooperate to form a second chamber, and the outer cylinder portion, the third wall portion and the rear cover cooperate to form a third chamber.

[0021] In this way, the second and third chambers can be formed by mounting the front cover and the rear cover on the body, and the printed circuit board is located in the first chamber, and the rotor and the impeller are located in the second chamber, so that the printed circuit board can be separated from the chamber where the fluid medium flows.

[0022] In a possible implementation, the electronic water pump further includes a driving circuit board, and the pump body further includes a rear shell, which is located at the rear side of the rear cover and cooperates with the rear cover to form a fourth chamber, and the driving circuit board is disposed in the fourth chamber.

[0023] In this way, the driver circuit board placed in the fourth chamber will be protected from corrosion by the fluid medium, which helps to improve the reliability and life of the electronic water pump. In addition, when the fluid medium passes through the third chamber, it will exchange heat with the fourth chamber through the rear cover, thereby taking away the heat of the driver circuit board and preventing the driver circuit board from overheating, failure or damage.

[0024] In a possible implementation, the fluid medium flows back from the outer periphery of the impeller through the first gap and the second gap in sequence to the middle of the impeller.

[0025] In this way, when the electronic water pump is running, the pressure difference generated by the impeller will participate in driving the fluid medium to flow through the first gap and the second gap, so that the fluid medium takes away the heat of the heat-generating components of the electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments are briefly introduced below.

[0027] It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and should not be viewed as limiting the scope.

[0028] It should also be understood that the same or similar reference numerals are used in the drawings to represent the same or similar elements.

[0029] It should also be understood that the drawings are merely schematic and that the sizes and proportions of elements in the drawings are not necessarily accurate.

[0030] Figure 1 It is a schematic diagram of an exploded view of an electronic water pump according to a disclosed embodiment.

[0031] Figure 2 yes Figure 1 Schematic diagram of the structure of the rotor and impeller.

[0032] Figure 3 yes Figure 1 Cross-sectional view of the electronic water pump.

[0033] Figure 4 It is a cross-sectional view of an electronic water pump according to a disclosed variation. DETAILED DESCRIPTION

[0034] The following is an exemplary description of the embodiments of the present disclosure in conjunction with the accompanying drawings. It should be understood that the present disclosure can be implemented in a variety of ways and should not be construed as being limited to the embodiments described herein, which are only for a more thorough and clear understanding of the present disclosure.

[0035] The present disclosure provides an electronic water pump 100. For example, the electronic water pump 100 can be applied to automobiles, especially new energy vehicles. In particular, the electronic water pump 100 can be applied to automobile thermal management systems. More particularly, the electronic water pump 100 can be used to drive a cooling fluid medium to flow in a pipeline of a thermal management system. It should be understood that the application scenarios mentioned here are exemplary, and the application scenarios of the electronic water pump 100 are not necessarily limited thereto.

[0036] For ease of understanding, the following is an example of the structure of the electronic water pump 100. It should be understood that the structure of the electronic water pump 100 should not be limited to the following description. For example, one or more of the elements cited below can be omitted or replaced, and the layout relationship between them can be replaced.

[0037] refer to Figure 1 and Figure 2 The electronic water pump 100 may include a pump body 10, a stator 20, a rotor 31 and an impeller 32. Figure 3, the stator 20 may be located in the first chamber 41 and fixed relative to the pump body 10. The rotor 31 may be connected to the impeller 32 as a whole and disposed in the second chamber 42, so that the rotor 31 can rotate with the impeller 32 around a rotation axis AA relative to the pump body 10. Here, the axis AA may pass through the center of the stator 20 and the center of the rotor 31. For ease of understanding, the rotation axis AA is Figure 3 is schematically shown in FIG.

[0038] The working principle of the electronic water pump 100 provided by the present disclosure may be substantially the same as the working principle of a conventional electronic water pump. For ease of understanding, the working principle of the electronic water pump 100 is briefly described by way of example. Figure 3 When the electronic water pump 100 is running, the stator 20 with current flowing through it generates a rotating magnetic field, which acts on the rotor 31 to form a magneto-electrical rotation torque. Under the action of the torque, the rotor 31 rotates with the impeller 32. In this process, under the action of the impeller 32, the fluid medium sucked into the second chamber 42 will be discharged, thereby achieving the purpose of driving the fluid medium.

[0039] The rotor 31 may be a magnet 31. For example, referring to Figure 1 and Figure 2 , a plurality of magnets 31 may be spaced apart from each other around the rotation axis AA. The stator 20 may be a printed circuit board 20 having a magnetic induction coil. Figure 3 The first chamber 41 and the second chamber 42 are separated by a partition wall 130. The partition wall 130 may include a first wall portion 131 perpendicular to the axis AA. The magnet 31 and the printed circuit board 20 may be located on both sides of the first wall portion 131, respectively.

[0040] Compared with a conventional electronic water pump having a stator core and a stator winding, the electronic water pump 100 uses a printed circuit board 20 having a magnetic induction coil as the stator 20, which enables the electronic water pump 100 to obtain a smaller axial dimension. In addition, the printed circuit board 20 is located in the first chamber 41, the rotor 31 and the impeller 32 are located in the second chamber 42, and the first chamber 41 and the second chamber 42 are separated by a partition wall 130. Therefore, the printed circuit board 20 can be separated from the second chamber 42, that is, separated from the chamber where the fluid medium flows, which can prevent the printed circuit board 20 (that is, the stator 20) from being immersed in the fluid medium and being corroded and damaged.

[0041] In order to prevent the stator 20 and other heat generating components from being damaged due to overheating during operation, a portion of the fluid medium may be directed to flow through a set path to remove the generated heat. This path may be referred to as a cooling path. Figure 3 (and the following Figure 4 ) in which the cooling path can be shown by a plurality of thick arrows that terminate in a connected manner.

[0042] refer to Figure 3 , a first gap 51 may be provided between the first wall portion 131 and the magnet 31. The partition wall 130 may further include a second wall portion 132 parallel to the axis AA, and a second gap 52 may be provided between the second wall portion 132 and the impeller 32. The first gap 51 may be communicated with the second gap 52, and the cooling path extends through the first gap 51 and the second gap 52. According to this configuration, the fluid medium flowing through the first gap 51 and the second gap 52 will exchange heat with the first wall portion 131 and the second wall portion 132, which can improve the heat exchange efficiency between the fluid medium and the first chamber 41, thereby being able to more effectively dissipate heat from the stator 20.

[0043] Continue to refer Figure 3 , the pump body 10 may include a main body 13, and the main body 13 may include an outer cylinder portion 133 and an end wall portion 134. The main body 13 may also include the above-mentioned first wall portion 131 and the second wall portion 132. That is, in the current example, the partition wall 130 may be a part of the main body 13. The outer cylinder portion 133 may surround the second wall portion 132, the first wall portion 131 may extend between the outer cylinder portion 133 and the second wall portion 132, and the end wall portion 134 may close the rear end of the second wall portion 132. According to this configuration of the main body, it is only necessary to close the front end and the rear end of the main body 13 respectively to form the first chamber 41 and the second chamber 42 separated from each other. This can simplify the structural complexity of the electronic water pump 100 and the complexity of the assembly process.

[0044] Continue to refer Figure 3 The pump body 10 may further include a front cover 11 and a rear cover 12. The main body 13 may cooperate with the front cover 11 to form a second chamber 42, and may cooperate with the rear cover 12 to form a first chamber 41. In this way, the front cover 11 and the rear cover 12 may be mounted on the main body 13 to form the first chamber 41 and the second chamber 42, and the printed circuit board 20 is located in the first chamber 41, and the rotor 31 and the impeller 32 are located in the second chamber 42, so that the printed circuit board 20 can be separated from the chamber where the fluid medium flows, thereby preventing the printed circuit board 20 from being immersed in the fluid medium and being corroded and damaged.

[0045] Continue to refer Figure 3 , the electronic water pump 100 may further include a driving circuit board 60, which is received in the first chamber 41. Since the first chamber 41 and the second chamber 42 are separated from each other, the fluid medium only exists in the second chamber 42, and thus the driving circuit board 60 placed in the first chamber 41 will be protected from being corroded by the fluid medium, which helps to improve the reliability and life of the electronic water pump 100. In addition, in this manner, the stator 20 and the driving circuit board 60 are placed in the same chamber, which helps to reduce the structural complexity of the pump body 10.

[0046] Continue to refer Figure 3 The fluid medium flowing along the cooling path may extend from the outer periphery of the impeller 32 to the middle of the impeller 32 through the first gap 51 and the second gap 52 in sequence. In this way, when the electronic water pump 100 is running, the pressure difference generated by the impeller 32 will participate in driving the fluid medium to flow through the first gap 51 and the second gap 52, so that the fluid medium takes away the heat of the heat-generating components of the electronic water pump 100.

[0047] Further, continue to refer to Figure 3 The electronic water pump 100 may further include a pump shaft 14 and a bearing 15. The pump shaft 14 may be fixed to the pump body 10 at least along the axis AA. The bearing 15 may be located between the pump shaft 14 and the impeller 32. Thus, by cooperating with the pump shaft 14 and the bearing 15, the impeller 32 may be rotatably supported in the pump body 10.

[0048] Further, continue to refer to Figure 3 The bearing 15 may be provided with a flow groove 151, and the cooling channel may extend through the bearing 15 through the flow groove 151. Due to the presence of the flow groove 151, the fluid medium flowing along the cooling path can flow back to the impeller chamber of the impeller 32 through the bearing 15 without affecting the normal operation of the bearing 15. At the same time, when flowing through the flow groove 151, the fluid medium can exchange heat with the bearing 15, which helps to prevent the structural deformation caused by overheating of the bearing 15 and improve the transmission efficiency of the bearing 15.

[0049] It should be understood that there are many ways to implement the electronic water pump disclosed in the present invention, and it should not be construed as being limited to the embodiments described above. Figure 4 , an electronic water pump 100a provided according to a modified example of the present disclosure is exemplified. It should be noted that the electronic water pump 100 in the aforementioned embodiment and the electronic water pump 100 in the following modified example have some common elements. In the present disclosure, these common elements will use the same figure numbers to omit repeated description.

[0050] refer to Figure 4In the modified example of the present disclosure, the electronic water pump 100a may also have a third chamber 43 connected to the second gap 52a. In addition to the first wall portion 131 and the second wall portion 132a, the partition wall 130a may also include a third wall portion 135. The third wall portion 135 may extend radially outward from the outside of the second wall portion 132a to separate the first chamber 41a and the third chamber 43. In this way, the fluid medium flowing along the cooling path can flow through the first gap 51, the second gap 52a and the third chamber 43 in sequence. In this process, the fluid medium will go around the outer periphery of the first chamber 41a and contact the first wall portion 131, the second wall portion 132a and the third wall portion 135. In this way, the fluid medium can more fully exchange heat with the first chamber 41a during the flow process, and take away more heat from the first chamber 41a, thereby further improving the heat dissipation performance of the electronic water pump 100a.

[0051] Continue to refer Figure 4 , the pump body 10a may include a main body 13a, and the main body 13a includes an outer cylinder portion 133a, a first wall portion 131, and a second wall portion 132a. The outer cylinder portion 133a may surround the second wall portion 132a, and the first wall portion 131 extends between the outer cylinder portion 133a and the second wall portion 132a. The inner periphery and the outer periphery of the third wall portion 135 may be detachably connected to the second wall portion 132a and the outer cylinder portion 133a, respectively. In this way, when the printed circuit board 20 is installed, the printed circuit board 20 may be placed in the space formed by the first wall portion 131, the second wall portion 132a, and the outer cylinder portion 133a, and then the inner periphery and the outer periphery of the third wall portion 135 may be engaged with the second wall portion 132a and the outer cylinder portion 133a, respectively, and then the front end and the rear end of the main body 13a are respectively closed, so that the first chamber 41a, the second chamber 42, and the third chamber 43 separated from each other can be formed. This method has many advantages such as simple structure and easy assembly and disassembly.

[0052] There are many ways to achieve the detachable connection of the inner periphery and outer periphery of the third wall portion 135 with the second wall portion 132a and the outer tube portion 133a, respectively, and the present disclosure does not impose any particular restrictions on this. As an example, the inner periphery and outer periphery of the third wall portion 135 may be provided with protrusions, and the second wall portion 132a and the outer tube portion 133a may be provided with grooves, and the connection can be completed by pressing the protrusions into the corresponding grooves.

[0053] Continue to refer Figure 4The pump body 10a may further include a front cover 11 and a rear cover 12a, the main body 13a cooperates with the front cover 11 to form a second chamber 42, and the outer cylinder 133a, the third wall 135 and the rear cover 12a cooperate to form a third chamber 43. In this implementation, the second chamber 42 and the third chamber 43 can be formed by installing the front cover 11 and the rear cover 12a on the main body 13a, and the printed circuit board 20 is located in the first chamber 41a, and the rotor 31 and the impeller 32a are located in the second chamber 42, so that the printed circuit board 20 can be separated from the chamber where the fluid medium flows.

[0054] Further, continue to refer to Figure 4 The rear end of the rear cover 12a can extend rearward to form a recessed portion that matches the shape of the pump shaft 14a to receive and support at least a portion of the pump shaft 14a.

[0055] Further, continue to refer to Figure 4 , the electronic water pump 100a may further include a driving circuit board 60. The pump body 10a may further include a rear shell 16, which may be located at the rear side of the rear cover 12a and cooperate with the rear cover 12a to form a fourth chamber 44. The driving circuit board 60 is disposed in the fourth chamber 44. The driving circuit board 60 placed in the fourth chamber 44 will be protected from corrosion by the fluid medium, which helps to improve the reliability and life of the electronic water pump 100a. In addition, when the fluid medium passes through the third chamber 43, it will exchange heat with the fourth chamber 44 through the rear cover 12a, thereby taking away the heat of the driving circuit board 60, and preventing the driving circuit board 60 from overheating, failure or damage.

[0056] It should be understood that the term "including" and its variations used in the present disclosure are open inclusions, i.e., "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0057] It should be understood that although the terms "first" or "second", etc. may be used in the present disclosure to describe various elements (such as a first chamber and a second chamber), these elements are not defined by these terms, and these terms are only used to distinguish one element from another.

[0058] The components and devices involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the drawings. As will be appreciated by those skilled in the art, these components and devices may be connected, arranged, or configured in any manner.

[0059] The protection scope of the present disclosure is not limited to the above-mentioned embodiments. Any changes or substitutions that can be conceived by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. An electronic water pump, comprising a pump body, a stator, a rotor and an impeller, wherein the stator is fixedly arranged in a first chamber of the pump body; the rotor and the impeller are connected as one body and rotatably arranged around an axis in a second chamber of the pump body, characterized in that: The rotor is a magnet, the stator is a printed circuit board with a magnetic induction coil, and the axis passes through the center of the magnet and the center of the printed circuit board; The first chamber and the second chamber are separated by a partition wall, the partition wall includes a first wall portion perpendicular to the axis, and the magnet and the printed circuit board are respectively located on both sides of the first wall portion.

2. The electronic water pump according to claim 1, characterized in that: A first gap is defined between the first wall portion and the magnet; the partition wall further includes a second wall portion parallel to the axis, a second gap is defined between the second wall portion and the impeller, and the first gap and the second gap are connected.

3. The electronic water pump according to claim 2, characterized in that: The pump body includes a main body, which includes an outer cylinder portion, an end wall portion, the first wall portion and the second wall portion, the outer cylinder portion surrounds the second wall portion, the first wall portion extends between the outer cylinder portion and the second wall portion, and the end wall portion closes the rear end of the second wall portion.

4. The electronic water pump according to claim 3, characterized in that: The pump body further comprises a front cover and a rear cover. The main body cooperates with the front cover to form the second chamber, and cooperates with the rear cover to form the first chamber.

5. The electronic water pump according to claim 1, characterized in that: It also includes a driving circuit board, which is accommodated in the first cavity.

6. The electronic water pump according to claim 2, characterized in that: The pump body further comprises a third chamber communicating with the second gap, and the partition wall further comprises a third wall portion extending radially outward from the outer side of the second wall portion to separate the first chamber from the third chamber.

7. The electronic water pump according to claim 6, characterized in that: The pump body includes a main body, which includes an outer cylinder portion, the first wall portion and the second wall portion, the outer cylinder portion surrounds the second wall portion, the first wall portion extends between the outer cylinder portion and the second wall portion, and the inner periphery and outer periphery of the third wall portion are respectively detachably connected to the second wall portion and the outer cylinder portion.

8. The electronic water pump according to claim 7, characterized in that: The pump body further comprises a front cover and a rear cover. The main body cooperates with the front cover to form the second chamber. The outer cylinder portion, the third wall portion and the rear cover cooperate to form the third chamber.

9. The electronic water pump according to claim 8, characterized in that: It also includes a driving circuit board. The pump body also includes a rear shell, which is located at the rear side of the rear cover and cooperates with the rear cover to form a fourth chamber. The driving circuit board is arranged in the fourth chamber.

10. The electronic water pump according to any one of claims 2 to 4 or 6 to 9, characterized in that: The fluid medium flows back from the outer periphery of the impeller through the first gap and the second gap in sequence to the middle of the impeller.

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