Rotor structure for dish washing machine

Abstract

The rotor structure comprises a rotor shaft, the circumference of the rotor shaft is connected with a plastic sleeve, magnetic steel is embedded in the plastic sleeve, the two end faces of the magnetic steel are respectively provided with an annular groove, the two end faces of the magnetic steel are respectively provided with a plurality of hole grooves, and the plastic sleeve is of an injection molding structure. The annular groove and the hole grooves are formed in the two end faces of the magnetic steel respectively, the wrapping force of the plastic sleeve on the magnetic steel can be increased after the plastic sleeve is subjected to injection molding, and therefore the magnetic steel is prevented from cracking, and in addition, even if the magnetic steel is cracked, the situation that the dishwasher is blocked due to the fact that the magnetic steel 3 falls off can be effectively avoided; according to the utility model, the hole slot is arranged on the N-pole and S-pole connecting zero line of the magnetic steel, so that the problem that the N-pole and S-pole connecting zero line of the magnetic steel is easy to crack can be effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of dishwasher rotor technology, and specifically relates to a rotor structure for a dishwasher. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver. These motors have the characteristics of fast response, large starting torque, and the ability to provide rated torque from zero speed to rated speed. They have the advantages of traditional DC motors while eliminating the carbon brush and slip ring structure, and are widely used.

[0003] In the existing technology, the rotor of a brushless DC motor is usually an integral rotor made by injection molding together a shaft and a cylindrical permanent magnet. During the injection molding production of the rotor, on the one hand, due to the influence of process factors such as injection pressure and high temperature, the permanent magnet of the rotor may be damaged and microcracks may be generated. On the other hand, there may be defects such as flaws or uneven materials on the permanent magnet, resulting in insufficient strength. This may also cause the permanent magnet of the rotor to crack or break when the motor is working.

[0004] Currently, most dishwashers use DC brushless motors. The motor speed of dishwashers is relatively high (generally up to about 3000 rpm), which causes the permanent magnets on the rotor to be subjected to a large centrifugal force. In actual operation, the permanent magnets on the rotor often crack, which leads to motor damage. In particular, when the magnets crack through both ends, they are easy to fall out and cause the dishwasher to jam. Utility Model Content

[0005] The purpose of this invention is to provide a rotor structure for a dishwasher to solve the problems mentioned in the background section. The rotor structure for a dishwasher provided by this invention avoids magnet cracking and prevents the dishwasher from jamming.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rotor structure for a dishwasher, including a rotor shaft, a plastic sleeve connected to the circumference of the rotor shaft, a magnet embedded inside the plastic sleeve, annular grooves provided on the two end faces of the magnet, and several holes and slots provided on the two end faces of the magnet, and the plastic sleeve is an injection molded structure.

[0007] To increase the wrapping force of the plastic sleeve on the magnet, the diameter of the annular groove is further 1.5-2mm, and the diameter of the perforated groove is 2-4mm.

[0008] To address the issue of cracking easily occurring on the zero-point line where the N and S poles of the magnet intersect, a slot is further positioned on this line.

[0009] To increase the protective force of the plastic sleeve on the magnet, chamfers are further provided on the outer edges of both ends of the magnet. The chamfer size is 1-2mm. The plastic sleeve covers the chamfer of the magnet.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. This utility model has annular grooves and several holes on the two end faces of the magnet, which can increase the wrapping force of the plastic sleeve on the magnet after the plastic sleeve is injection molded, thereby preventing the magnet from cracking. In addition, even if the magnet cracks, it can effectively prevent the magnet from falling off and causing the dishwasher to jam.

[0012] 2. The groove of this utility model is located on the zero-position line where the N pole and S pole of the magnet intersect, which can effectively solve the problem of easy cracking on the zero-position line where the N pole and S pole of the magnet intersect.

[0013] 3. The outer edges of both ends of the magnet in this utility model are chamfered to further increase the wrapping force of the plastic sleeve on the magnet. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 3 This is a schematic diagram of the end face structure of the magnet of this utility model;

[0017] Figure 4 This is a cross-sectional structural diagram of the magnet of this utility model.

[0018] In the diagram: 1. Rotor shaft; 2. Plastic sleeve; 3. Magnet; 31. Annular groove; 32. Hole groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] Please see Figures 1-4The present invention provides the following technical solution: a rotor structure for a dishwasher, including a rotor shaft 1, a plastic sleeve 2 connected to the circumference of the rotor shaft 1, a magnet 3 embedded inside the plastic sleeve 2, annular grooves 31 respectively provided on the two end faces of the magnet 3, and a plurality of holes 32 respectively provided on the two end faces of the magnet 3, the plastic sleeve 2 being an injection molded structure to realize the connection between the rotor shaft 1 and the magnet 3.

[0022] By adopting the above technical solution, the present invention provides annular grooves 31 and several holes 32 on the two end faces of the magnet 3, which can increase the wrapping force of the plastic sleeve 2 on the magnet 3 after the plastic sleeve 2 is injection molded, thereby preventing the magnet 3 from cracking. In addition, even if the magnet 3 cracks, it can effectively prevent the magnet 3 from falling and causing the dishwasher to jam.

[0023] Specifically, the diameter of the annular groove 31 is 1.5 mm; the diameter of the hole groove 32 is 2 mm.

[0024] Example 2

[0025] The difference between this embodiment and embodiment 1 is that, specifically, the diameter of the annular groove 31 is 1.75 mm; and the diameter of the hole groove 32 is 3 mm.

[0026] Example 3

[0027] The difference between this embodiment and embodiment 1 is that, specifically, the diameter of the annular groove 31 is 2mm; and the diameter of the hole groove 32 is 4mm.

[0028] Example 4

[0029] The difference between this embodiment and embodiment 1 is that, specifically, the slot 32 is located on the zero-position line where the N pole and S pole of the magnet 3 intersect.

[0030] By adopting the above technical solution, the problem of easy cracking at the zero-position line where the N pole and S pole of magnet 3 meet can be effectively solved.

[0031] Example 5

[0032] The difference between this embodiment and embodiment 1 is that: specifically, the outer edges of both ends of the magnet 3 are chamfered, the size of the chamfer is 1-2mm, and in this embodiment it is preferably 2mm, and the plastic sleeve 2 covers the chamfer of the magnet 3.

[0033] By adopting the above technical solution, the wrapping force of the plastic sleeve 2 on the magnet 3 is further increased.

[0034] In summary, this invention provides annular grooves 31 and several holes 32 on the two end faces of the magnet 3, which can increase the wrapping force of the plastic sleeve 2 on the magnet 3 after injection molding, thereby preventing the magnet 3 from cracking. In addition, even if the magnet 3 cracks, it can effectively prevent the magnet 3 from falling and causing the dishwasher to jam. The holes 32 of this invention are located on the zero line where the N pole and S pole of the magnet 3 intersect, which can effectively solve the problem that the magnet 3 is prone to cracking on the zero line where the N pole and S pole of the magnet 3 intersect. The outer edges of the two end faces of the magnet 3 of this invention are chamfered to further increase the wrapping force of the plastic sleeve 2 on the magnet 3.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotor structure for a dishwasher comprising a rotor shaft, characterized in that: The plastic sleeve is connected to the circumference of the rotor shaft, the inside of the plastic sleeve is embedded with a magnetic steel, two end faces of the magnetic steel are respectively provided with ring grooves, and a plurality of hole grooves are respectively arranged on the two end faces of the magnetic steel, and the plastic sleeve is an injection molding structure.

2. A rotor structure for a dishwasher according to claim 1, characterized in that: The diameter of the ring groove is 1.5-2mm.

3. A rotor structure for a dishwasher according to claim 1, characterized in that: The hole groove is located on the N pole and S pole intersection zero line of the magnetic steel.

4. A rotor structure for a dishwasher according to claim 1, characterized in that: The diameter of the hole groove is 2-4mm.

5. A rotor structure for a dishwasher according to claim 1, characterized in that: The outer side of the two end faces of the magnetic steel is provided with a chamfer.

6. A rotor structure for a dishwasher according to claim 5, characterized in that: The size of the chamfer is 1-2mm.

7. A rotor structure for a dishwasher according to claim 5, characterized in that: The plastic sleeve is covered on the chamfer of the magnetic steel.

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