Electronic pump

Abstract

The application provides an electronic pump, which comprises an impeller, the impeller comprises a first blade and a second blade, the first blade has a first noise reduction groove, the second blade has a second noise reduction groove, the first noise reduction groove and the second noise reduction groove present difference in shape and / or size, so that when the impeller rotates, the first blade and the second blade passing through the same point can produce different pressure pulsation interference, the probability that the vibration frequency of the first blade and the second blade concentrates on a single frequency is reduced, the vibration peak frequency of the impeller is reduced, and the vibration noise of the electronic pump can be reduced.

Description

Technical Field

[0001] This application pertains to the field of automotive parts, and particularly relates to an electronic pump. Background Technology

[0002] In the automotive industry, electric pumps deliver coolant to the vehicle's thermal management system, removing most of the heat generated by the vehicle's drive motor, battery, and control modules. They also provide heat transfer fluid to the heating system, ensuring that the vehicle's electric drive system operates within its optimal temperature range, thereby improving the vehicle's reliability and safety.

[0003] In related technologies, electronic pumps include blades. When the blades rotate, the liquid flows from the leading edge of the blade to the trailing edge and eventually leaves the blade. The liquid will experience periodic pressure pulsation and turbulence as it passes the trailing edge of the blade. When the blades rotate at a certain speed, the pulsation frequencies of multiple blades passing through the same point are similar and superimposed to form the vibration peak frequency, which can easily cause unnecessary vibration noise in the electronic pump. Summary of the Invention

[0004] This application provides an electronic pump that can reduce vibration and noise.

[0005] To address the aforementioned technical problems, this application provides an electronic pump, including a pump shaft and an impeller. The impeller is sleeved on one end of the pump shaft. The impeller includes a first blade and a second blade, which are rotatable about the axis of the pump shaft. The first blade has a first noise reduction groove located at a first trailing edge of the first blade, which is located on the side of the first blade away from the pump shaft. The second blade has a second noise reduction groove located at a second trailing edge of the second blade, which is located on the side of the second blade away from the pump shaft. The first noise reduction groove and the second noise reduction groove differ in shape and / or size.

[0006] The electronic pump provided in this application includes an impeller, which includes a first blade and a second blade. The first blade has a first noise reduction groove, and the second blade has a second noise reduction groove. The first noise reduction groove and the second noise reduction groove are different in shape and / or size, so that when the impeller rotates, the first blade and the second blade can generate different pressure pulsation interferences when passing through the same point, thereby reducing the probability that the vibration frequency of the first blade and the second blade is concentrated at a single frequency, thereby reducing the peak vibration frequency of the impeller and thus reducing the vibration noise of the electronic pump. Attached Figure Description

[0007] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of a water pump provided in one embodiment of this application;

[0009] Figure 2 for Figure 1 A side view diagram;

[0010] Figure 3 for Figure 2 Schematic sectional view of section A in the middle;

[0011] Figure 4 for Figure 3 Schematic diagram of the structure of the impeller and rotor assembly;

[0012] Figure 5 for Figure 4 First explosion diagram;

[0013] Figure 6 for Figure 5 A magnified view of a portion of the first blade;

[0014] Figure 7 for Figure 5 A magnified view of a portion of the second blade;

[0015] Figure 8 for Figure 4 A schematic diagram of the second explosion;

[0016] Figure 9 This is an exploded view of the impeller and rotor assembly in another embodiment of this application;

[0017] Figure 10 This is a reference diagram for the vibration test of the water pump provided in this embodiment.

[0018] In the diagram: 1-Pump shaft; 2-Impeller; 21-First blade; 210-First noise reduction groove; 201-First trailing edge; 211-First sidewall; 212-Second sidewall; 213-Third wall; 2131-First dividing wall; 2132-Second dividing wall; 2100-First slot; 21a-First edge; 21b-Second edge; 22-Second blade; 220-Second noise reduction groove; 202-Second trailing edge; 221-Fourth sidewall; 222-Fifth sidewall; 223-Sixth wall; 2231-Third dividing wall; 223 2-Fourth dividing wall; 2200-Second slot; 22a-Third edge; 22b-Fourth edge; 3-First cover plate; 30-First cover plate wall; 31-First cover plate slot; 4-Second cover plate; 40-Second cover plate wall; 5-Rotor assembly; 51-Encapsulated part; 61-Protrusion; 62-Groove part; 620-Groove; 7-Impeller cover; 71-Inlet; 72-Outlet; 81-Stator assembly; 82-Motor housing; 9-Control assembly; 101-First bearing; 102-Second bearing; 11-Gasket; L-Shaft. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail. When the following description relates to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements.

[0020] It should be understood that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one; "multiple" indicates two or more. Unless otherwise stated, terms such as "front," "rear," "lower," and / or "upper" are for illustrative purposes only and are not limited to a location or spatial orientation. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects.

[0021] The exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0022] This application provides an electronic pump, including a pump shaft 1 and an impeller 2. The impeller 2 is sleeved on one end of the pump shaft 1. The impeller 2 includes a first blade 21 and a second blade 22. The first blade 21 and the second blade 22 are rotatable about the axis L of the pump shaft 1. The first blade 21 has a first noise reduction groove 210 located at the first trailing edge 201 of the first blade 21, which is located on the side of the first blade 21 away from the pump shaft 1. The second blade 22 has a second noise reduction groove 220 located at the second trailing edge 202 of the second blade 22, which is located on the side of the second blade 22 away from the pump shaft 1. The first noise reduction groove 210 and the second noise reduction groove 220 are different in shape and / or size.

[0023] The electronic pump provided in this application includes an impeller 2, which includes a first blade 21 and a second blade 22. The first blade 21 has a first noise reduction groove 210, and the second blade 22 has a second noise reduction groove 220. The first noise reduction groove 210 and the second noise reduction groove 220 are different in shape and / or size, so that when the impeller 2 rotates, the first blade 21 and the second blade 22 can generate different pressure pulsation interferences when passing through the same point, thereby reducing the probability that the vibration frequency of the first blade 21 and the second blade 22 is concentrated at a single frequency, thereby reducing the vibration peak frequency of the impeller 2, and thus reducing the vibration noise of the electronic pump.

[0024] According to a specific embodiment of this application, such as Figures 1 to 8 As shown, the electronic pump in this embodiment is applied in the automotive field, especially in the field of new energy vehicles, where the noise reduction requirements are higher than those of fuel vehicles.

[0025] The electronic pump in this embodiment is an electronic water pump.

[0026] An electronic pump according to this embodiment includes an impeller 2. The impeller 2 is rotatable. When the impeller 2 rotates, the liquid / water flow will generate periodic pressure pulsations when it is thrown out after passing the trailing edge of the impeller 2. The frequency of the pressure pulsations is superimposed to form the peak frequency of vibration, which makes the electronic pump and the connecting pipe prone to unnecessary vibration noise.

[0027] The electronic pump of this embodiment includes a pump shaft 1, and an impeller 2 is sleeved on one end of the pump shaft 1. The impeller 2 can rotate relative to the pump shaft 1. In other words, the impeller 2 can rotate around the axis L of the pump shaft 1.

[0028] In this embodiment, the impeller 2 includes a first blade 21 and a second blade 22, which are capable of rotating about the axis L of the pump shaft 1.

[0029] The first blade 21 has a first noise reduction groove 210, which is located at the first trailing edge 201 of the first blade 21. The first trailing edge 201 is located on the side of the first blade 21 away from the pump shaft 1. In this embodiment, the first blade 21 has a first trailing edge 201 and a first leading edge. Liquid / water flow can flow from the first leading edge to the first trailing edge 201 and eventually detach from the first blade 21. In this embodiment, the first leading edge is closer to the pump shaft 1 than the first trailing edge 201.

[0030] The second blade 22 has a second noise reduction groove 220, which is located at the second trailing edge 202 of the second blade 22. The second trailing edge 202 is located on the side of the second blade 22 away from the pump shaft 1. In this embodiment, the second blade 22 has a second trailing edge 202 and a second leading edge. Liquid / water flow can flow from the second leading edge to the second trailing edge 202 and eventually detach from the second blade 22. In this embodiment, the second trailing edge 202 is farther away from the pump shaft 1 than the second leading edge.

[0031] In this embodiment, the first noise reduction groove 210 and the second noise reduction groove 220 differ in shape and / or size; that is, the shape of the first noise reduction groove 210 differs from the shape of the second noise reduction groove 220, or the size of the first noise reduction groove 210 differs from the size of the second noise reduction groove 220, or both the shape and size of the first noise reduction groove 210 differ from the shape and size of the second noise reduction groove 220.

[0032] Through extensive research, the inventors discovered that changing the shape of the trailing edge of the blades in impeller 2 can regulate the pressure pulsation during impeller rotation. However, in related technologies, the trailing edge shape of the blades in impeller 2 remains consistent. In this case, the pulsation frequencies of multiple blades passing through the same point are similar and superimposed to form the peak vibration frequency. Based on the above discovery, when the inventors change part of the trailing edge shape of impeller 2, they can make multiple blades of impeller 2 pass through the same point with different pressure pulsation frequencies, thereby making the order vibration generated by impeller 2 have a wider bandwidth and a lower pitch.

[0033] Therefore, in this embodiment, the inventors, in conjunction with the above findings, changed the shape of the trailing edge of the blades in the impeller 2, and made the shape and / or size of the first noise reduction groove 210 of the first blade 21 and the second noise reduction groove 220 of the second blade 22 different, so that the pressure pulsation frequencies of the first blade 21 and the second blade 22 passing through the same point during rotation are different, thereby making the order vibration generated by the impeller 2 in this embodiment have a wider bandwidth and a lower pitch.

[0034] When the aforementioned electronic pumps are applied in the automotive field, they can reduce the overall vibration and noise transmitted to the passenger compartment, thereby improving in-vehicle comfort.

[0035] In addition, in order to avoid excessive vibration and noise, the speed of electronic pumps in related technologies has to be limited, thereby reducing flow performance, making it difficult to balance the requirements of performance and noise and vibration.

[0036] Unlike electronic pumps in related technologies, the electronic pump in this embodiment effectively reduces the vibration and noise of the electronic pump without limiting its speed by setting a first noise reduction groove 210 and a second noise reduction groove 220 with different shapes and / or sizes on the first blade 21 and the second blade 22, respectively. Therefore, the electronic pump in this embodiment can take into account both flow performance and noise and vibration requirements; in other words, the vibration and noise of the electronic pump in this embodiment is significantly improved under high flow conditions.

[0037] In this embodiment, the electronic pump also includes a first cover plate 3 and a second cover plate 4 arranged along the axis L of the pump shaft 1, and a first blade 21 and a second blade 22 are located between the first cover plate 3 and the second cover plate 4.

[0038] In this embodiment, the impeller 2 includes multiple blades, some of which are integrally formed with the first cover plate 3 and some of which are integrally formed with the second cover plate 4. The blade integrally formed with the first cover plate 3 is defined as blade A, and the blade integrally formed with the second cover plate 4 is defined as blade B. In this embodiment, blade A and blade B are spaced apart. In other words, the blade adjacent to blade A is blade B, and the blade adjacent to blade B is blade A.

[0039] In this embodiment, the first blade 21 can be either blade A or blade B. Similarly, the second blade 22 in this embodiment can be either blade A or blade B. When the first blade 21 is blade A and the second blade 22 is blade A, or when the first blade 21 is blade B and the second blade 22 is blade B, the first blade 21 and the second blade 22 are spaced apart, that is, the first blade 21 and the second blade 22 are not adjacent. When the first blade 21 is blade A and the second blade 22 is blade B, or when the first blade 21 is blade B and the second blade 22 is blade A, the first blade 21 and the second blade 22 can be adjacent, or they can be non-adjacent / spaced apart.

[0040] In this embodiment, the first blade 21 is blade B, and the second blade 22 is blade B. That is, the first blade 21 and the second cover plate 4 are integrally formed, and the second blade 22 and the second cover plate 4 are integrally formed, as an example for further description. Figure 5 As shown, the first blade 21 and the second blade B are arranged in a centrally symmetrical manner around the center of the second cover plate 4. This arrangement can balance the performance of the second cover plate 4 and the blade B on it when they rotate.

[0041] Of course, in other embodiments, the first blade 21 can be either blade A or blade B, and the second blade 22 can be either blade A or blade B. The first blade 21 and the second blade 22 are arranged in a centrally symmetrical manner around the center of the first cover plate 3 or the second cover plate 4. This will not be described in detail here. When the balance of the impeller 2 during rotation is not considered or the balance requirement during the impeller rotation is not high, the first blade 21 and the second blade 22 can be arranged adjacent to each other or non-centrally symmetrical around the center of the impeller 2.

[0042] In this embodiment, as shown in the figure, the first cover plate 3 has a first cover plate groove 31, which is located at the center of the first cover plate 3 and extends along the thickness direction of the first cover plate 3 and penetrates the side wall of the first cover plate 3. Fluid / water can enter the impeller 2 from the first cover plate groove 31 and flow out of the impeller 2 from the trailing edge of the blade. The leading edge of the blade is defined as the end of the blade close to the first cover plate groove 31, and the trailing edge of the blade is defined as the end of the blade away from the first cover plate groove 31. That is, the leading edge and the trailing edge of the blade are located at the two ends of the blade, respectively.

[0043] Similarly, the first trailing edge 201 of the first blade 21 is the end of the first blade 21 that is away from the first cover plate groove 31; the second trailing edge 202 of the second blade 22 is the end of the second blade 22 that is away from the first cover plate groove 31.

[0044] In this embodiment, specifically, such as Figure 4 and Figure 5 As shown, the first blade 21 includes a first sidewall 211 and a second sidewall 212, which are arranged along the thickness direction of the first blade 21. The first blade 21 also includes a third wall 213, which connects the first sidewall 211 and the second sidewall 212. The third wall 213 is located at the first trailing edge 201 end of the first blade 21, and the first slot 2100 of the first noise reduction groove 210 is located on the third wall 213.

[0045] like Figure 4 and Figure 5 As shown, the second blade 22 includes a fourth sidewall 221 and a fifth sidewall 222, which are arranged along the thickness direction of the second blade 22. The second blade 22 also includes a sixth wall 223, which connects the fourth sidewall 221 and the fifth sidewall 222. The sixth wall 223 is located at the second trailing edge 202 end of the second blade 22, and the second slot 2200 of the second noise reduction groove 220 is located on the sixth wall 223.

[0046] In this embodiment, please refer to Figure 4 and Figure 5As shown, the first noise reduction groove 210 penetrates the first sidewall 211 and the second sidewall 212 along the thickness direction of the first blade 21. By using the first noise reduction groove 210, the resistance of water flowing through the first trailing edge 201 of the first blade 21 can be reduced, and the hydrodynamic performance of the first blade 21 can be optimized. In addition, the first noise reduction groove 210 can also promote the momentum exchange of the fluid, regulate and balance the pressure on both sides of the first blade 21 in the thickness direction, reduce the noise caused by pressure imbalance, make the pressure distribution when water flows through more uniform, reduce the probability of the formation of local high pressure or low pressure areas, and thus reduce the vibration and noise caused by pressure change.

[0047] Please refer to Figure 4 and Figure 5 As shown, the second noise reduction groove 220 penetrates the fourth sidewall 221 and the fifth sidewall 222 along the thickness direction of the second blade 22. By utilizing the aforementioned first noise reduction groove 210, the resistance of water flowing through the first trailing edge 201 of the first blade 21 can be reduced, thus optimizing the hydrodynamic performance of the second blade 22. In addition, the aforementioned second noise reduction groove 220 can also promote the momentum exchange of the fluid, regulate and balance the pressure on both sides of the second blade 22 in the thickness direction, reduce the noise caused by pressure imbalance, make the pressure distribution when water flows through more uniform, reduce the probability of the formation of local high pressure or low pressure zones, and thus reduce the vibration and noise caused by pressure changes.

[0048] Of course, this embodiment is described using the example of setting a first noise reduction groove 210 for the first blade 21 and a second noise reduction groove 220 for the second blade 22. In other embodiments, multiple blades of the impeller 2 can be provided with noise reduction grooves. Among them, the shape and / or size of the noise reduction grooves of at least two blades are different, which will not be described in detail here.

[0049] In this embodiment, as Figure 6 As shown, the third wall 213 includes a first partition wall 2131 and a second partition wall 2132, and the wall forming the first noise reduction groove 210 includes at least the first partition wall 2131 and the second partition wall 2132.

[0050] At least one of the first partition wall 2131 and the second partition wall 2132 is configured as a streamlined structure;

[0051] The first partition wall 2131 and the second partition wall 2132 are smoothly connected / transitioned; in other words, there is no obvious connecting ridge between the first partition wall 2131 and the second partition wall 2132.

[0052] The first noise reduction groove 210 of the above structure is similar to the tail fin of a fish, especially the tail fin of a shark. That is, the first trailing edge 201 of the first blade 21 is a curved extension of the structure of a shark tail fin, which can minimize the resistance of water flow when passing through the first blade 21. The smooth surface and curved surface of the first trailing edge 201, which is biomimetic to the shape of a tail fin, can effectively reduce the generation of turbulence, thereby reducing the noise and vibration caused by turbulence.

[0053] In this embodiment, as Figure 7 As shown, the sixth wall 223 includes a third sub-wall 2231 and a fourth sub-wall 2232, and the wall forming the second noise reduction groove 220 includes at least the third sub-wall 2231 and the fourth sub-wall 2232.

[0054] At least one of the third partition wall 2231 and the fourth partition wall 2232 is configured as a streamlined structure.

[0055] The third partition 2231 and the fourth partition 2232 are smoothly connected / transitioned; in other words, there is no obvious connecting ridge between the third partition 2231 and the fourth partition 2232.

[0056] Similarly, the structure of the second noise reduction groove 220 of the above structure is similar to the tail fin of a fish, especially the tail fin of a shark. That is, the second trailing edge 202 of the second blade 22 is a curved extension of the structure of a shark tail fin, which can minimize the resistance of water flow when passing through the first blade 21. The smooth surface and curved surface of the first trailing edge 201, which is biomimetic to the shape of a tail fin, can effectively reduce the generation of turbulence, thereby reducing noise and vibration caused by turbulence.

[0057] In this embodiment, the first blade 21 includes a first edge 21a and a second edge 21b. The first edge 21a connects the first sidewall 211 and the third wall 213, and the second edge 21b connects the second sidewall 212 and the third wall 213. At least one of the first edge 21a and the second edge 21b is set as a curve. This embodiment is described using the example where both the first edge 21a and the second edge 21b are set as curves. Figure 6 As shown, the first trailing edge 201 of the above structure is closer to a biomimetic tail fin, resulting in better noise reduction.

[0058] The second blade 22 in this embodiment includes a third edge 22a and a fourth edge 22b. The third edge 22a connects the fourth sidewall 221 and the sixth wall 223, and the fourth edge 22b connects the fifth sidewall 222 and the sixth wall 223. At least one of the third edge 22a and the fourth edge 22b is curved. This embodiment is described using the example where both the third edge 22a and the fourth edge 22b are curved. Figure 7 As shown, the second trailing edge 202 of the above structure is closer to a biomimetic tail fin, resulting in better noise reduction.

[0059] In this embodiment, at least one of the first edge 21a and the second edge 21b is located on a curve that is part of one of four curves: sine, hyperbola, parabola, and Bezier curve. At least one of the third edge 22a and the fourth edge 22b is located on a curve that is part of the other three curves. In other words, the wall surface forming the first noise reduction groove 210 and the wall surface forming the second noise reduction groove 220 have different shapes. As a result, when the impeller 2 is running, the first blade 21 and the second blade 22 generate different hydrodynamic interferences, which in turn generate different pressure pulsation interferences. This avoids the vibration frequencies of the two blades being concentrated at a single frequency. As a result, the order vibrations generated by the impeller 2 have a wider bandwidth and a lower pitch, and the noise reduction effect is better.

[0060] In this embodiment, the curve types of the first edge 21a and the second edge 21b are consistent, and the curve types of the third edge 22a and the fourth edge 22b are consistent. Of course, in some other embodiments, the curve types of the first edge 21a and the second edge 21b may be different, and the curve types of the third edge 22a and the fourth edge 22b may also be different.

[0061] like Figure 10 The vibration test reference diagram shown is illustrated below. The red curve represents the vibration and noise distribution curve of the original design, and the blue curve represents the vibration and noise distribution curve of this design. Figure 10 It is evident that the red curve exhibits more pronounced vibrations in the 1st and 8th orders, resulting in stronger vibration noise. In contrast, the design of this application, with the blue curve showing significant improvement in the 1st and 8th order vibrations, effectively reduces the vibration noise of the entire electric pump during operation, achieving a more ideal noise reduction effect.

[0062] Of course, in another embodiment, at least one of the first edge 21a and the second edge 21b is set as a broken line, that is, the line containing at least one of the first edge 21a and the second edge 21b is a straight line; this embodiment is described using the example of both the first edge 21a and the second edge 21b being set as broken lines, such as... Figure 9 As shown, the first trailing edge 201 of the above structure also has a noise reduction effect and is easier to process.

[0063] At least one of the third edge 22a and the fourth edge 22b is set as a broken line, that is, the line containing at least one of the third edge 22a and the fourth edge 22b is a straight line; this embodiment takes the example of both the third edge 22a and the fourth edge 22b being set as broken lines for further description, such as Figure 9 As shown, the second trailing edge 202 of the above structure also has a noise reduction effect and is easier to process.

[0064] The angle formed by the first edge 21a and the second edge 21b is different from the angle formed by the third edge 22a and the fourth edge 22b. In other words, there is a size difference between the wall surface forming the first noise reduction groove 210 and the wall surface forming the second noise reduction groove 220. As a result, when the impeller 2 is running, the first blade 21 and the second blade 22 generate different hydrodynamic interferences, which in turn generate different pressure pulsation interferences. This avoids the vibration frequencies of the two blades being concentrated at a single frequency. As a result, the order vibration generated by the impeller 2 has a wider bandwidth and a lower pitch, and the noise reduction effect is better.

[0065] Of course, in some other embodiments, at least one of the first edge 21a and the second edge 21b is set as a curve, and at least one of the third edge 22a and the fourth edge 22b is set as a broken line.

[0066] Specifically, in some other embodiments, the curve containing at least one of the first edge 21a and the second edge 21b is a portion of one of the four curves: sine, hyperbola, parabola, and Bezier curve; the straight line containing at least one of the third edge 22a and the fourth edge 22b is a broken line. In other words, the shape of the wall forming the first noise reduction groove 210 is different from that of the wall forming the second noise reduction groove 220. This causes the first blade 21 and the second blade 22 to generate different hydrodynamic interferences during impeller 2 operation, resulting in different pressure pulsation interferences. This avoids the vibration frequencies of the two blades being concentrated at a single frequency, resulting in the impeller 2 generating order vibrations with a wider bandwidth and lower pitch, and achieving better noise reduction.

[0067] In this embodiment, as Figure 8 As shown, the side wall of the first cover plate 3 near the second cover plate 4 is defined as the first cover plate wall 30, and the side wall of the second cover plate 4 near the first cover plate 3 is defined as the second cover plate wall 40. The first opening 2100 of the first noise reduction groove 210 extends to the first cover plate wall 30 and the second cover plate wall 40, and the second opening 2200 of the second noise reduction groove 220 extends to the first cover plate wall 30 and the second cover plate wall 40. In other words, along the axis L of the pump shaft 1, the distance between the first cover plate wall 30 and the second cover plate wall 40 is equivalent to the width of the first opening 2100. The first noise reduction groove 210 with the above structure can balance the pressure pulsation on both sides of the first blade 21 to the maximum extent, thus effectively reducing vibration noise. Similarly, along the axis L of the pump shaft 1, the distance between the first cover plate wall 30 and the second cover plate wall 40 is equivalent to the width of the second opening 2200. The second noise reduction groove 220 with the above structure can balance the pressure pulsation on both sides of the second blade 22 to the maximum extent, thereby improving the noise reduction effect.

[0068] In this embodiment, the electronic pump further includes a rotor assembly 5, with a second cover plate 4 located between the first cover plate 3 and the rotor assembly 5. The rotor assembly 5 includes a molding compound 51, and the molding compound 51, the second cover plate 4, and at least a portion of the impeller 2 are integrally injection molded; in other words, as Figure 3 As shown, since the first blade 21 and the second blade 22 in this embodiment are both located on the second cover plate wall 40 of the second cover plate 4, the first blade 21, the second blade 22, the second cover plate 4 and the sealing part 51 in this embodiment are integrally injection molded / processed together to facilitate the processing and manufacturing of some blades.

[0069] In this embodiment, the electronic pump includes a protrusion 61 and a recess 62. The impeller 2 is connected to the protrusion 61. The recess 62 is located in at least one of the first cover plate 3 and the second cover plate 4. The recess 62 has a groove 620. The protrusion 61 is at least partially located in the groove 620.

[0070] When the protrusion 61 is located on blade A, it is further formed by integral injection molding of the protrusion 61 and blade A, and the groove 620 of the recessed portion 62 is located on the second cover plate wall 40; when the protrusion 61 is located on blade B, it is further formed by integral injection molding of the protrusion 61 and blade B, and the groove 620 of the recessed portion 62 is located on the first cover plate wall 30. In this embodiment, the protrusion 61 is located on blade A and blade B respectively, and correspondingly, the groove 620 of the recessed portion 62 is located on the second cover plate wall 40 and the first cover plate wall 30 respectively. The insertion and engagement of the protrusion 61 and the groove 620 enables the rapid positioning and installation of the first cover plate 3 and the second cover plate 4, and also improves the connection stability of the first cover plate 3 and the second cover plate 4.

[0071] In this embodiment, the electronic pump includes an impeller cover 7 and a motor housing 82, wherein the impeller 2 is at least partially located in the cover cavity of the bolted impeller cover 7, the rotor assembly 5 is at least partially located in the housing cavity of the motor housing 82, and the motor housing 82 is connected and fixed to the impeller cover 7.

[0072] Furthermore, the impeller cover 7 has an inlet 71 and an outlet 72, with the inlet 71 corresponding to the first cover plate groove 31, as shown below. Figure 3 As shown, fluid / water can flow from inlet 71 through first cover groove 31 and finally out of electric pump from outlet 72.

[0073] In this embodiment, the electronic pump also includes a stator assembly 81, which is located in the cavity of the motor housing 82 and is located on the periphery of the rotor assembly 5. The stator assembly 81 and the rotor assembly 82 are coaxially arranged, and the stator assembly 81 and the rotor assembly 5 form an inner rotor and outer stator structure. The above-mentioned placement structure of the stator assembly 81 and the rotor assembly 5 forms a drive motor assembly with an inner rotor and outer stator.

[0074] Electric pumps include, for example Figure 3 The first bearing 101 and the second bearing 102 shown are arranged along the axis L of the pump shaft 1. The first bearing 101 is sleeved on the pump shaft 1, and the outer ring of the first bearing 101 is connected to the rotor assembly 5. Similarly, the inner ring of the second bearing 102 is connected to the pump shaft 1, and the outer ring of the second bearing 102 is connected to the rotor assembly 5.

[0075] In this embodiment, when the electronic pump is started, the rotor assembly 5 and the impeller 2 rotate synchronously. Under the action of centrifugal force, the fluid / water entering the impeller 2 is thrown out of the impeller 2 from the trailing edge of the blades and finally flows out of the electronic pump from the outlet 72 on the impeller cover 7.

[0076] The electronic pump in this embodiment also includes a control component 9, which is located on the side of the stator assembly 81 / rotor assembly 5 away from the impeller 2. In other words, the control component 9 and the impeller 2 are located on opposite sides of the stator assembly 81 / rotor assembly 5 along the axial direction. The control component 9 is electrically connected to the drive motor assembly.

[0077] In this embodiment, the electronic pump also includes a gasket 11, such as Figure 3 As shown, the gasket 11 is located between the impeller cover 7 and the first bearing 101 to isolate the impeller cover 7 from the first bearing 101. The gasket 11 is preferably, but not limited to, a ceramic gasket.

[0078] Of course, in some other embodiments, the first noise reduction groove 210 can be a continuous wavy groove, the second noise reduction groove 220 can be a circular hole, or the groove depth of the first noise reduction groove 210 can be different from the groove depth of the second noise reduction groove 220. These will not be described in detail here, but they also have the same noise reduction effect.

[0079] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An electronic pump, characterized in that: The pump includes a pump shaft and an impeller. The impeller is sleeved on one end of the pump shaft. The impeller includes a first blade and a second blade. The first blade and the second blade are rotatable about the axis of the pump shaft. The first blade has a first noise reduction groove located at the first trailing edge of the first blade. The first trailing edge is located on the side of the first blade away from the pump shaft. The second blade has a second noise reduction groove located at the second trailing edge of the second blade, which is located on the side of the second blade away from the pump shaft. The first noise reduction groove and the second noise reduction groove differ in shape and / or size.

2. The electronic pump according to claim 1, characterized in that: The first blade includes a first sidewall and a second sidewall, which are arranged along the thickness direction of the first blade. The first blade also includes a third wall, which connects the first sidewall and the second sidewall. The third wall is located at the first trailing edge of the first blade, and the first opening of the first noise reduction groove is located on the third wall. The second blade includes a fourth sidewall and a fifth sidewall, which are arranged along the thickness direction of the second blade. The second blade also includes a sixth wall, which connects the fourth sidewall and the fifth sidewall. The sixth wall is located at the second trailing edge end of the second blade, and the second opening of the second noise reduction groove is located on the sixth wall.

3. The electronic pump according to claim 2, characterized in that: The first noise reduction groove extends through the first sidewall and the second sidewall along the thickness direction of the first blade; The second noise reduction groove extends through the fourth sidewall and the fifth sidewall along the thickness direction of the second blade.

4. The electronic pump according to claim 2 or 3, characterized in that: The first blade includes a first edge and a second edge, the first edge connecting the first sidewall and the third wall, the second edge connecting the second sidewall and the third wall, and at least one of the first edge and the second edge being configured as a curve; The second blade includes a third edge and a fourth edge, the third edge connecting the fourth sidewall and the sixth wall, the fourth edge connecting the fifth sidewall and the sixth wall, and at least one of the third edge and the fourth edge being configured as a curve.

5. The electronic pump according to claim 4, characterized in that: The curve containing at least one of the first edge and the second edge is a part of one of the four curves: sine curve, hyperbola, parabola, and Bézier curve, and the curve containing at least one of the third edge and the fourth edge is a part of the other three.

6. The electronic pump according to claim 2 or 3, characterized in that: The first blade includes a first edge and a second edge, the first edge connecting the first sidewall and the third wall, the second edge connecting the second sidewall and the third wall, and at least one of the first edge and the second edge being configured as a curve; The second blade includes a third edge and a fourth edge, the third edge connecting the fourth sidewall and the sixth wall, the fourth edge connecting the fifth sidewall and the sixth wall, and at least one of the third edge and the fourth edge being configured as a broken line.

7. The electronic pump according to claim 6, characterized in that: The curve containing at least one of the first edge and the second edge is a part of one of the four curves: sine curve, hyperbola, parabola, and Bézier curve, and the straight line containing at least one of the third edge and the fourth edge is a broken line.

8. The electronic pump according to claim 2 or 3, characterized in that: The first blade includes a first edge and a second edge, the first edge connecting the first sidewall and the third wall, the second edge connecting the second sidewall and the third wall, and at least one of the first edge and the second edge being configured as a broken line; The second blade includes a third edge and a fourth edge, the third edge connecting the fourth sidewall and the sixth wall, the fourth edge connecting the fifth sidewall and the sixth wall, and at least one of the third edge and the fourth edge being configured as a broken line; The angle formed by the first edge and the second edge is different from the angle formed by the third edge and the fourth edge.

9. The electronic pump according to any one of claims 1-8, characterized in that: The electronic pump also includes a first cover plate and a second cover plate arranged along the axial direction of the pump shaft, with the first blade and the second blade located between the first cover plate and the second cover plate; The side wall of the first cover plate near the second cover plate is defined as the first cover plate wall, and the side wall of the second cover plate near the first cover plate is defined as the second cover plate wall. The first opening of the first noise reduction groove extends to the first cover plate wall and the second cover plate wall, and the second opening of the second noise reduction groove extends to the first cover plate wall and the second cover plate wall. The electric pump also includes a rotor assembly, with the second cover plate located between the first cover plate and the rotor assembly. The rotor assembly includes a plastic seal, and the plastic seal, the second cover plate, and at least a portion of the impeller are integrally injection molded.

10. The electronic pump according to claim 9, characterized in that: The electronic pump includes a protrusion and a recess, the impeller is connected to the protrusion, the recess is located on at least one of the first cover plate and the second cover plate, the recess has a groove, and the protrusion is at least partially located in the groove; The electronic pump includes a stator assembly and a motor housing. At least a portion of both the stator assembly and the rotor assembly is located within the cavity of the motor housing. The stator assembly and the rotor assembly are coaxially arranged, and the stator assembly and the rotor assembly form an inner rotor and outer stator structure.

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