Electronic water pump

Abstract

The utility model discloses an electronic water pump, which relates to the technical field of power equipment, and comprises a volute and a rear end cover, the volute and the rear end cover form an accommodating cavity, a rotatable rotating shaft is arranged in the accommodating cavity, the rotating shaft is a solid shaft, a rotor is sleeved on the rotating shaft, the rotor is fixedly connected with the rotating shaft, and a waterproof sleeve is further arranged in the accommodating cavity. The rotor and the rotating shaft are located in the waterproof sleeve, the edge of the rotor and the inner wall of the waterproof sleeve form a cooling channel, the edge contour of the rotor comprises a plurality of arc segments and linear segments which are alternately arranged, an electric control module is further arranged below the waterproof sleeve, heat of the electric control module can be transmitted to the rear end cover, and cooling liquid in the cooling channel makes contact with the rear end cover. Therefore, heat of the electric control module is taken away. Through the arrangement, a liquid outlet channel does not need to be arranged in the rotating shaft, the problem that the machining cost of the rotating shaft is high is solved, and reliable heat dissipation of the electronic water pump is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power equipment, in particular to an electronic water pump. Background Art

[0002] The heat dissipation performance of the electronic water pump is crucial. The electronic control module of the electronic water pump will generate heat during operation, which will cause the operating temperature of the electronic components on the electronic control module to increase, affecting the normal operation of the electronic water pump.

[0003] In order to achieve heat dissipation of the electronic water pump, a liquid outlet channel is usually opened inside the rotating shaft. Taking CN107725395A as an example, the rotating shaft is hollow to form a liquid outlet channel, and the liquid outlet channel connects the rotor mounting cavity and the pump body cavity. The cooling liquid can only flow out through the liquid outlet channel inside the rotating shaft, thereby achieving heat dissipation. It can be seen that the processing cost of the hollow rotating shaft is high and the process is complicated. In addition, when processing the liquid outlet channel, it is also necessary to consider whether it will affect the overall strength of the rotating shaft, which is more restricted. Utility Model Content

[0004] The utility model aims to provide an electronic water pump, which does not need to set a liquid outlet channel in the rotating shaft, thereby solving the problem of high processing cost of the rotating shaft and realizing reliable heat dissipation of the electronic water pump.

[0005] To achieve the above-mentioned purpose, the utility model provides an electronic water pump, including a volute and a rear end cover, the volute and the rear end cover form a accommodating chamber, a rotatable shaft is provided in the accommodating chamber, the shaft is a solid shaft, a rotor is sleeved on the shaft, the rotor and the shaft are fixedly connected, a water-blocking jacket is also provided in the accommodating chamber, the rotor and the shaft are both located in the water-blocking jacket, the edge of the rotor and the inner wall of the water-blocking jacket form a cooling channel, the edge profile of the rotor includes a plurality of alternating arc segments and straight line segments, an electric control module is also provided under the water-blocking jacket, the heat of the electric control module can be transferred to the rear end cover, the cooling liquid in the cooling channel contacts with the rear end cover to take away the heat of the electric control module.

[0006] Preferably, the end of the straight line segment is tangent to the end of the arc segment.

[0007] Preferably, the arc segment is specifically an eccentric circular arc.

[0008] Preferably, the arc lengths of all the eccentric arcs are the same, the radii of the eccentric circles corresponding to all the eccentric arcs are consistent, and the centers of the eccentric circles corresponding to all the eccentric arcs are located on the same circle.

[0009] Preferably, all straight line segments have the same length.

[0010] Preferably, the number of arc segments and straight line segments is at least 3 respectively.

[0011] Preferably, the rotation axis of the shaft coincides with the center line of the waterproof sleeve.

[0012] Preferably, bearings are provided at both ends of the rotating shaft, and the cooling liquid in the cooling channel flows through one side of the bearing to take away the heat of the bearing.

[0013] Preferably, the distance between the edge of the rotor and the inner wall of the water blocking sleeve is 0.3-0.8 mm.

[0014] Preferably, the magnetic field of the rotor is distributed in a sinusoidal wave.

[0015] Compared with the above-mentioned background technology, the electronic water pump provided by the utility model includes a volute and a rear end cover, the volute and the rear end cover form a accommodating chamber, a rotatable shaft is provided in the accommodating chamber, the shaft is a solid shaft, a rotor is sleeved on the shaft, the rotor and the shaft are fixedly connected, a watertight jacket is also provided in the accommodating chamber, the rotor and the shaft are both located in the watertight jacket, the edge of the rotor and the inner wall of the watertight jacket form a cooling channel, the edge profile of the rotor includes alternating arc segments and straight line segments, an electric control module is also provided under the watertight jacket, the heat of the electric control module can be transferred to the rear end cover, the cooling liquid in the cooling channel is in contact with the rear end cover to take away the heat of the electric control module. In the electronic water pump configured in this way, the edge profile of the rotor includes alternating arc segments and straight line segments rather than a circle as used in the prior art. During the rotation of the rotor, the gap between the edge of the rotor and the inner wall of the water barrier sleeve will change, that is, the width of the cooling channel changes with the rotation of the rotor, which is conducive to the flow of cooling liquid in the cooling channel to dissipate heat to components such as the rotor and the electronic control module. There is no need to open a cooling channel in the center of the shaft, which not only solves the problem of high shaft processing costs, but also achieves reliable heat dissipation of the electronic water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 A cross-sectional view of an electronic water pump provided by an embodiment of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the middle rotor;

[0019] in:

[0020] Volute 1, rear end cover 2, rotating shaft 3, rotor 4, arc segment 41, straight segment 42, water blocking jacket 5, cooling channel 6, electronic control module 7, bearing 8. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The utility model provides an electronic water pump, as shown in the attached Figure 1 As shown, it includes a volute 1 and a rear end cover 2. The volute 1 and the rear end cover 2 are buckled together to form a receiving chamber, in which components such as a rotating shaft 3, a rotor 4, a water-blocking sleeve 5 and a bearing 8 are arranged.

[0024] The two ends of the rotating shaft 3 can be rotatably arranged through bearings 8. The rotating shaft 3 is a solid shaft with reliable structural strength. The rotating shaft 3 is sleeved with a rotor 4, and the rotor 4 and the rotating shaft 3 are fixedly connected, and the rotor 4 and the rotating shaft 3 can realize synchronous rotation.

[0025] Both the rotor 4 and the rotating shaft 3 are located in the watertight jacket 5, and the edge of the rotor 4 and the inner wall of the watertight jacket 5 form a cooling channel 6. It can be seen that the cooling channel 6 in the present invention is located inside the watertight jacket 5 and on the outside of the rotor 4, rather than inside the rotating shaft 3 in the prior art.

[0026] As attached Figure 2 As shown, the edge profile of the rotor 4 includes a plurality of arc segments 41 and straight line segments 42 that are alternately arranged, that is, the edge profile of the rotor 4 is similar to the contour line of a cam, and is not circular. During the rotation of the rotor 4, the distance between the edge profile of the rotor 4 and the inner wall of the watertight jacket 5 is constantly changing, that is, the width of the cooling channel 6 is changing, which helps the cooling liquid to flow rapidly in the cooling channel 6, thereby achieving a rapid heat dissipation effect.

[0027] An electric control module 7 is also provided under the water-proof sleeve 5. The electric control module 7 is used to control the operation of the electronic water pump. The heat of the electric control module 7 can be transferred to the rear end cover 2. The electric control module 7 and the rear end cover 2 can be in direct or indirect contact so that the heat of the electric control module 7 can be transferred to the rear end cover 2. The cooling liquid contacts the rear end cover 2, thereby taking away the heat of the electric control module 7 and achieving heat dissipation of the electric control module 7.

[0028] Furthermore, the end of the straight segment 42 is tangent to the end of the arc segment 41 , so that the connection between the straight segment 42 and the arc segment 41 avoids a right-angle connection, making the edge profile of the rotor 4 smooth, avoiding stress concentration, and improving the overall structural reliability of the rotor 4.

[0029] The arc segment 41 can be specifically set as an eccentric arc, which can make the edge profile of the rotor 4 more regular. At the same time, it can refer to the processing methods of related technologies to facilitate processing and production, which helps to better achieve the purpose of rapid flow of cooling liquid.

[0030] Furthermore, the arc lengths of all the eccentric arcs are the same, the radii of the eccentric circles corresponding to all the eccentric arcs are consistent, and the centers of the eccentric circles corresponding to all the eccentric arcs are located on the same circle.

[0031] The edge profile of the rotor 4 configured in this way is more processable and has a more stable and reliable structure, thereby improving the reliability of the electronic water pump.

[0032] All straight line segments 42 have the same length. It can be seen that during the processing, the straight line segments 42 can be processed by complete disc milling. When a straight line segment 42 is milled, the rotor 4 is controlled to rotate at the same angle and then another straight line segment 42 is processed. This greatly simplifies the processing process, improves the processing efficiency, and ensures that the processed rotor 4 is reliable.

[0033] The number of the arc segments 41 and the number of the straight line segments 42 are at least 3, respectively. With such an arrangement, the edge profile of the rotor 4 is closer to a circle, so as to ensure the efficiency requirement of the electronic water pump.

[0034] The rotation axis of the rotating shaft 3 coincides with the center line of the waterproof sleeve 5, thereby ensuring that the rotation process of the rotating shaft 3 and the rotor 4 is stable and reliable.

[0035] In combination with the above, bearings 8 are provided at both ends of the rotating shaft 3, and the cooling liquid in the cooling channel 6 flows through one side of the bearing 8 to take away the heat of the bearing 8. It can be seen that the cooling liquid can smoothly pass through the cooling channel 6 and flow to one side of the bearing 8 to cool down and dissipate the heat of the bearing 8.

[0036] The distance between the edge of the rotor 4 and the inner wall of the watertight sleeve 5 is 0.3-0.8 mm, which can effectively ensure the efficiency requirements of the electronic water pump and the flow rate of the cooling liquid in the cooling channel 6, further improving the reliability of the electronic water pump.

[0037] In the electronic water pump of the present invention, the magnetic field of the rotor 4 is distributed in a sinusoidal wave, which abandons the square wave control in the prior art, that is, the electronic water pump realizes sinusoidal wave control, which can reduce noise and vibration, improve smoothness, and improve NVH (Noise, Vibration, Harshness) performance.

[0038] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An electronic water pump, comprising a volute (1) and a rear end cover (2), wherein the volute (1) and the rear end cover (2) form a receiving cavity, characterized in that: A rotatable shaft (3) is provided in the accommodating chamber, and the shaft (3) is a solid shaft. A rotor (4) is sleeved on the shaft (3), and the rotor (4) and the shaft (3) are fixedly connected. A water-blocking sleeve (5) is also provided in the accommodating chamber, and both the rotor (4) and the shaft (3) are located in the water-blocking sleeve (5). The edge of the rotor (4) and the inner wall of the water-blocking sleeve (5) form a cooling channel (6). The edge profile of the rotor (4) includes a plurality of alternating arc segments (41) and straight line segments (42). An electric control module (7) is also provided below the water-blocking sleeve (5). The heat of the electric control module (7) can be transferred to the rear end cover (2). The cooling liquid in the cooling channel (6) is in contact with the rear end cover (2) to take away the heat of the electric control module (7).

2. The electronic water pump according to claim 1, characterized in that: The end of the straight line segment (42) is tangent to the end of the arc segment (41).

3. The electronic water pump according to claim 2, characterized in that: The arc segment (41) is specifically an eccentric circular arc.

4. The electronic water pump according to claim 3, characterized in that: The arc lengths of all the eccentric arcs are the same, the radii of the eccentric circles corresponding to all the eccentric arcs are consistent, and the centers of the eccentric circles corresponding to all the eccentric arcs are located on the same circle.

5. The electronic water pump according to claim 4, characterized in that: All of the straight line segments (42) have the same length.

6. The electronic water pump according to claim 5, characterized in that: The number of the arc segments (41) and the number of the straight line segments (42) are at least 3 respectively.

7. The electronic water pump according to claim 1, characterized in that: The rotation axis of the rotating shaft (3) coincides with the center line of the waterproof sleeve (5).

8. The electronic water pump according to claim 1, characterized in that: Bearings (8) are provided at both ends of the rotating shaft (3), and the cooling liquid in the cooling channel (6) flows through one side of the bearing (8) to remove heat from the bearing (8).

9. The electronic water pump according to claim 1, characterized in that: The distance between the edge of the rotor (4) and the inner wall of the water blocking sleeve (5) is 0.3-0.8 mm.

10. The electronic water pump according to claim 1, characterized in that: The magnetic field of the rotor (4) is distributed in a sinusoidal wave.

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