Stator assembly for electronic water pump and electronic water pump

Abstract

The invention relates to the technical field of water pumps, and provides a stator assembly for an electronic water pump and the electronic water pump, and the stator assembly comprises a stator iron core which is formed by stacking stator punching sheets, and the stator iron core is sequentially provided with a top part, a middle part and a bottom part along the stacking direction of the stator punching sheets, the thicknesses of the stator punching sheets at the top and the bottom are smaller than the thickness of the stator punching sheet at the middle part; the mounting frame is connected to the stator iron core and is used for winding a stator winding; and the waterproof sleeve is connected in the stator iron core and abuts against the mounting rack. Compared with the prior art, the stator punching sheet has the advantages that the stator punching sheets at the top and the bottom are thinner than the stator punching sheets at the middle part, so that the eddy current loss at the two ends of the stator iron core is reduced, and the heat generated at the two ends of the stator iron core is smaller.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and in particular to a stator assembly for an electronic water pump and an electronic water pump. Background Art

[0002] An electronic water pump is a water pump driven by electricity and is usually used in automobile engine cooling systems. It is different from a traditional mechanical water pump, which relies on the mechanical movement of the engine to operate. The characteristics of an electronic water pump are that it uses an electric motor or other electric device as a power source and regulates its operating state through an electronic control system.

[0003] Under rated conditions, the sum of the losses of the rotor and permanent magnets in the electronic water pump is only 14.26% of the losses of the winding and stator. Therefore, after running for 1800 seconds, the temperature of the inner rotating domain of the motor is much lower than the temperature of the outer fixed domain. The peak temperature of the motor is 104.51°C at the end of the winding, and the temperature distribution of the winding is relatively uniform, with a maximum temperature difference of 4.51°C. Since part of the heat of the winding can be dissipated through the lower temperature stator conduction, and the end winding can only rely on weaker convection heat transfer to dissipate heat, the temperature of the end area of ​​the winding is slightly higher than the temperature of the slot area. In this way, when the motor is running, the main loss is the copper loss generated by the current passing through the copper wire of the stator winding (that is, the conversion of electrical energy into heat). The hottest points of the stator winding are located at both ends, and the traditional electronic water pump does not have a heat dissipation structure at the end of the stator winding, which makes it easy to form high-temperature heat accumulation, and even cause the motor to burn out in severe cases. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a stator assembly for an electronic water pump and an electronic water pump in view of the current status of the prior art.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: a stator assembly for an electronic water pump is proposed, comprising: a stator core, which is formed by stacking stator punching sheets, wherein the stator core is sequentially configured with a top, a middle part and a bottom along the stacking direction of the stator punching sheets, wherein the thickness of the stator punching sheets at the top and the bottom is smaller than the thickness of the stator punching sheets at the middle part; A mounting frame connected to the stator core and used for winding the stator winding; A water-blocking sleeve is connected inside the stator core and tightly abuts against the mounting frame.

[0006] In the above-mentioned stator assembly for an electronic water pump, the thickness of the stator punching sheets at the top and the bottom is 0.2-0.35 mm, and the thickness of the stator punching sheets in the middle is 0.5-0.65 mm.

[0007] In the above-mentioned stator assembly for an electronic water pump, the stator punchings at the top and the bottom are connected by gluing. In the above-mentioned stator assembly for an electronic water pump, the mounting frame has a first mounting frame and a second mounting frame, the first mounting frame is inserted into the stator core along the direction from the top to the bottom, and the second mounting frame is plugged into the stator core along the direction from the bottom to the top, wherein the first mounting frame and the second mounting frame are both constructed with a winding portion, the winding portion is used for winding the stator winding, and a hollow structure is opened on the winding portion.

[0008] In the above-mentioned stator assembly for an electronic water pump, the first mounting skeleton has a first main body portion in an annular structure, the winding portion extends from the inner wall of the first main body portion toward the center thereof, the inner wall of the stator core extends toward the center thereof to form a first convex portion, and the first mounting skeleton is provided with a first concave portion, the first convex portion and the first concave portion are pressed against each other, and are used to fix the first mounting skeleton on the stator core.

[0009] In the above-mentioned stator assembly for an electronic water pump, the second mounting frame has a second protrusion and a limiting portion arranged on the outer edge of the second mounting frame, the limiting portion is provided with a third protrusion, the stator core is constructed with an internal first plug-in slot and an outer second plug-in slot, the second protrusion is inserted into the first plug-in slot, and the third protrusion is inserted into the second plug-in slot, so as to fix the second mounting frame on the stator core.

[0010] In the above-mentioned stator assembly for an electronic water pump, the end face of the winding part facing the center of the mounting frame is constructed with a limiting groove, and the waterproof sleeve can be inserted into the stator core in the direction from the top to the bottom, and is tightly pressed against the end face of the winding part. The outer wall of the waterproof sleeve is expanded due to the force during operation so as to be stuck in the limiting groove, so as to prevent the waterproof sleeve and the mounting frame from relative displacement.

[0011] In the above-mentioned stator assembly for an electronic water pump, the stator punching sheets in the middle portion are connected by spot fastening or welding.

[0012] The present invention solves the above technical problem and further provides an electronic water pump, comprising the above stator assembly for an electronic water pump.

[0013] Compared with the prior art, the present invention has the following advantages: (1) By making the top and bottom stator laminations thinner than the stator laminations in the middle, the eddy current losses at both ends of the stator core are reduced, thereby reducing the heat generated at both ends of the stator core; (2) The stator laminations at the top and bottom of the stator core are fixed by gluing to reduce the eddy current loss at both ends of the stator core; (3) A hollow structure is provided at the winding part to increase air circulation at both ends of the stator core, thereby increasing heat transfer at both ends of the stator core and further reducing the temperature at both ends of the stator core; (4) By setting a limiting groove for fixing the water-blocking sleeve on the winding part, the water-blocking sleeve and the stator assembly can be better fixed to prevent them from moving, thereby ensuring the stability of the stator magnetic field. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a stereoscopic diagram of a stator assembly for an electronic water pump of the present invention; Figure 2 yes Figure 1 A top view of the Figure 3 yes Figure 2 Sectional view along AA direction; Figure 4 Figure 1 The three-dimensional diagram after the water-blocking sleeve is omitted; Figure 5 It is a three-dimensional diagram of the stator core; Figure 6 is a perspective view of a first mounting frame; Figure 7 It is a three-dimensional diagram of the second mounting frame connected to a portion of the stator core.

[0015] In the figure, 100, stator core; 110, stator punching sheet; 120, top; 130, middle part; 140, bottom; 150, first convex part; 160, first plug-in slot; 170, second plug-in slot; 200, mounting frame; 210, first mounting frame; 211, first main body; 212, first recess; 220, second mounting frame; 221, second convex part; 222, limiting part; 2221, third convex part; 230, winding part; 231, hollow structure; 232, limiting slot; 300, water-blocking sleeve; 400, stator winding. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0017] like Figures 1 to 7 As shown, in this solution, the structure of the stator assembly and its application in the electronic water pump are mainly described in detail.

[0018] A stator assembly for an electronic water pump comprises: a stator core 100, which is formed by stacking stator punching sheets 110, wherein the stator core 100 is sequentially constructed with a top 120, a middle portion 130 and a bottom 140 along the stacking direction of the stator punching sheets 110, wherein the thickness of the stator punching sheets 110 at the top 120 and the bottom 140 is smaller than the thickness of the stator punching sheets 110 at the middle portion 130; a mounting frame 200, which is connected to the stator core 100 and is used for winding a stator winding 400; and a water-blocking sleeve 300, which is connected to the stator core 100 and is tightly pressed against the mounting frame 200.

[0019] During operation, an induced current is generated in the stator core 100 of the motor. When alternating current passes through the winding of the motor, a changing magnetic field is generated in the stator core 100, and this magnetic field is formed in each stator punching sheet 110. This changing magnetic field will induce a circular current in the stator punching sheet 110. The direction of these currents is perpendicular to the direction of the original magnetic field, similar to a vortex in water, so it is called an eddy current. Eddy current is the source of heat generated by the stator punching sheet 110. The thickness of the stator punching sheet 110 is positively correlated with the eddy current loss (i.e., heat generated) caused by the generation of eddy current. In this solution, the stator punching sheets 110 at the top 120 and the bottom 140 are set to be thinner than the stator punching sheets 110 in the middle part 130, which is used to reduce the eddy current loss at both ends of the stator core 100, thereby making the heat generated at both ends of the stator core 100 smaller. Furthermore, the heat generated in the middle portion 130 of the stator core 100 is relatively lower than that at both ends, so the requirement for heat redundancy is higher. Therefore, the stator in the middle portion 130 can use relatively thicker stator punching sheets 110 to ensure the economy of the overall product.

[0020] Preferably, the thickness of the stator punching sheet 110 at the top 120 and the bottom 140 is 0.2-0.35 mm, and the thickness of the stator punching sheet 110 at the middle portion 130 is 0.5-0.65 mm.

[0021] The traditional stacking method of stator punching sheets 110 is mostly fixed by buckling points, that is, among two adjacent stator punching sheets 110, one is provided with a boss and the other is provided with a groove, and the boss and the groove are interference fit or transition fit. This connection method increases the local thickness of some stator punching sheets 110 (such as the boss), which increases the eddy current loss on the stator punching sheets 110, and causes the stator punching sheets 110 to generate more heat during operation. In this solution, the stator punching sheets 110 at the top 120 and the bottom 140 are connected by gluing, so as to reduce the eddy current loss of the punching sheets at the top 120 and the bottom 140 of the stator core 100. In addition, compared with buckling points and welding, bonding can reduce the operating noise because there is no friction between the boss and the groove, and the friction between the welding point and the stator punching sheet 110.

[0022] Preferably, the stator punching sheets 110 at the top 120 and the bottom 140 are bonded with two-component epoxy resin plus polyol prepolymer (NCO content 2.7% to 4%) to ensure that the stator punching sheets 110 do not move axially. Compared with the traditional buckle point or welding mode, this method can reduce eddy current loss and heat generation, thereby effectively improving the overall efficiency of the motor.

[0023] The mounting frame 200 comprises a first mounting frame 210 and a second mounting frame 220. The first mounting frame 210 is inserted into the stator core 100 along a direction from the top 120 to the bottom 140. The second mounting frame 220 is plugged into the stator core 100 along a direction from the bottom 140 to the top 120. The first mounting frame 210 and the second mounting frame 220 are both provided with a winding portion 230 for winding the stator winding 400. A hollow structure 231 is provided on the winding portion 230.

[0024] The hollow structure 231 on the winding part 230 is used to increase the air circulation between the stator winding 400 and the stator, and accelerate the convection of heat at both ends of the stator core 100 by increasing the air flow, thereby further reducing the heat at the ends of the stator core 100.

[0025] Preferably, the first mounting skeleton 210 has a first main body portion 211 in an annular structure, the winding portion 230 is formed by extending from the inner wall of the first main body portion 211 toward the center thereof, the inner wall of the stator core 100 is extended toward the center thereof to form a first convex portion 150, and the first recess 212 is provided on the first mounting skeleton 210, the first convex portion 150 and the first recess 212 are pressed against each other, and are used to fix the first mounting skeleton 210 on the stator core 100.

[0026] The second mounting frame 220 has a second protrusion 221 and a limiting portion 222 arranged on the outer edge of the second mounting frame 220, and a third protrusion 2221 is arranged on the limiting portion 222. The stator core 100 is constructed with an internal first plug-in slot 160 and an outer second plug-in slot 170. The second protrusion 221 is inserted into the first plug-in slot 160, and the third protrusion 2221 is inserted into the second plug-in slot 170, which is used to fix the second mounting frame 220 on the stator core 100.

[0027] The end face of the winding part 230 facing the center of the mounting frame 200 is structured with a limiting groove 232. The water blocking sleeve 300 can be inserted into the stator core 100 along the direction from the top 120 to the bottom 140, and is pressed against the end face of the winding part 230. The outer wall thereof is expanded due to the force during operation so as to be stuck in the limiting groove 232, so as to prevent the water blocking sleeve 300 and the mounting frame 200 from relative displacement.

[0028] During installation, the water-blocking sleeve 300 can be inserted into the stator core 100 along the direction from the top 120 to the bottom 140 of the stator core 100. During use, the liquid inside the water-blocking sleeve 300 impacts the water-blocking sleeve 300, causing the outer wall of the water-blocking sleeve 300 to partially sink into the limiting groove 232, thereby making the connection between the water-blocking sleeve 300 and the winding part 230 tighter, and can better fix the water-blocking sleeve 300 to the stator assembly to prevent it from moving, so as to ensure the stability of the stator magnetic field.

[0029] Preferably, the stator punching sheets 110 in the middle portion 130 are connected by spot fastening or welding. Since the heat dissipation pressure of the stator punching sheets 110 in the middle portion 130 is relatively small, a cheaper and conventional spot fastening method is adopted for economic considerations, and even welding can be used for cost reasons.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the scope defined by the spirit of the present invention.

Claims

1. A stator assembly for an electronic water pump, characterized in that: include: A stator core, which is formed by stacking stator punching sheets, wherein the stator core is sequentially configured with a top, a middle portion and a bottom portion along the stacking direction of the stator punching sheets, wherein the thickness of the stator punching sheets at the top and the bottom are both smaller than the thickness of the stator punching sheets at the middle portion; A mounting frame connected to the stator core and used for winding the stator winding; A water-blocking sleeve is connected inside the stator core and tightly abuts against the mounting frame.

2. A stator assembly for an electronic water pump as claimed in claim 1, characterized in that: The thickness of the stator punching sheets at the top and the bottom is 0.2-0.35 mm, and the thickness of the stator punching sheets at the middle portion is 0.5-0.65 mm.

3. A stator assembly for an electronic water pump as claimed in claim 1, characterized in that: The stator punching sheets at the top and the bottom are connected by gluing.

4. A stator assembly for an electronic water pump as claimed in claim 1, characterized in that: The mounting frame comprises a first mounting frame and a second mounting frame, the first mounting frame is inserted into the stator core along a direction from the top to the bottom, and the second mounting frame is plugged into the stator core along a direction from the bottom to the top, wherein the first mounting frame and the second mounting frame are both configured with a winding portion, the winding portion is used for winding the stator winding, and a hollow structure is opened on the winding portion.

5. A stator assembly for an electronic water pump as claimed in claim 4, characterized in that: The first mounting frame has a first main body portion in an annular structure, the winding portion is extended from the inner wall of the first main body portion toward the center thereof, the inner wall of the stator core is extended toward the center thereof to form a first convex portion, and the first mounting frame is provided with a first concave portion, the first convex portion and the first concave portion are pressed against each other, and are used to fix the first mounting frame on the stator core.

6. A stator assembly for an electronic water pump as claimed in claim 4, characterized in that: The second mounting frame has a second protrusion and a limiting portion arranged on the outer edge of the second mounting frame, and a third protrusion is arranged on the limiting portion. The stator core is constructed with an internal first plug-in groove and an outer second plug-in groove. The second protrusion is inserted into the first plug-in groove, and the third protrusion is inserted into the second plug-in groove, so as to fix the second mounting frame on the stator core.

7. A stator assembly for an electronic water pump as claimed in claim 4, characterized in that: The end face of the winding part facing the center of the mounting frame is structured with a limiting groove, and the waterproof sleeve can be inserted into the stator core along the direction from the top to the bottom, and pressed against the end face of the winding part. The outer wall thereof is stuck in the limiting groove due to expansion under force during operation, so as to prevent relative displacement between the waterproof sleeve and the mounting frame.

8. A stator assembly for an electronic water pump as claimed in claim 1, characterized in that: The stator punching sheets in the middle portion are connected by spot fastening or welding.

9. An electronic water pump, characterized in that: It comprises a stator assembly for an electronic water pump as claimed in any one of claims 1 to 8.

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