Dual start rotor assembly and drain pump thereof

Abstract

A double starting rotor assembly and its drainage pump, including a magnetic core, a rotor base and a rotating shaft, the magnetic core is installed on the surface of the rotor base, the rotating shaft is rotatably arranged in the rotor base, further including a starting mechanism, the rotor base is provided with a starting cavity, the starting mechanism is arranged in the starting cavity, the starting mechanism is composed of an outer starting ring and an inner starting ring which are rotatable relative to the starting cavity, a first driving rib is protruded on the cavity wall of the starting cavity, a first driven rib is protruded on the outer ring part of the outer starting ring, a second driving rib is further protruded on the inner ring part of the outer starting ring, a second driven rib is protruded on the outer ring part of the inner starting ring, and the rotating shaft is connected to the inner ring part of the inner starting ring, the starting mechanism of the rotor assembly is composed of the outer starting ring and the inner starting ring, so that the angle of rotation required for starting the rotor base is increased, and the torque required for starting the drainage pump is reduced, effectively avoiding the problems of starting failure and starting delay of the drainage pump in use.

Description

Technical Field

[0001] This utility model relates to the field of drain pumps for washing machines, specifically to a dual-start rotor assembly and its drain pump. Background Technology

[0002] As one of the most important components of a washing machine, the core function of the washing machine drain pump is to drain the wastewater from the inner drum after washing, ensuring that the washing process smoothly enters the spin-drying stage. The working principle of the washing machine drain pump is to use a motor to drive the impeller to rotate and generate negative pressure suction, which quickly draws out the water and discharges it to the outside through the pipe.

[0003] The most common washing machine drain pumps on the market are generally composed of a casing, a stator assembly, and a rotor assembly. The stator assembly is used to connect to an external power source and convert electrical energy into magnetic energy. It then uses the magnetic field to drive the rotor assembly to rotate, thereby rotating the impeller connected to the rotor assembly, which in turn draws water into the casing and finally discharges it through the pipe.

[0004] For example, Chinese patent application CN200920171050.0 discloses: "A noise reduction and anti-sand structure for a washing machine drain pump, comprising a pump body, an impeller, a lever, a bearing sleeve, and a bearing. The outer end of the pump body is connected to the impeller with an internal rotating lever. The bearing is sleeved on the outside and axially connected to the rotor. Two columnar rubber blocks are added between the lever and the inner side of the impeller. Corrugated grooves are provided on the inner wall of the pump body. A double-ring seal is provided between the bearing and the hard bearing sleeve. The beneficial effects of this utility model are: reducing the noise of the drain pump during operation, extending the service life of the whole machine, and improving the anti-sand performance of the drain pump; the corrugated grooves in the inner cavity of the pump body reduce the noise of the drain pump from 80dB to below 40dB in a semi-water state."

[0005] In order to reduce the starting torque required, existing washing machine drain pumps incorporate a starting mechanism in the rotor assembly. The rotation of the magnetic core under the influence of the magnetic field needs to be transmitted to the shaft through the starting mechanism. However, as in the aforementioned patent, the starting mechanism in the rotor assembly of existing drain pumps is a single-stage starter. After a single starting ring rotates a certain angle, it will cooperate with the shaft to drive it. This results in a smaller actual starting angle and a smaller impact on the starting torque required, which in turn leads to the existing washing machine drain pumps still having problems with starting failure and starting delay. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing single-start starting mechanism, which still causes the washing machine drain pump to fail to start and has a start delay, this utility model provides a dual-start rotor assembly and its drain pump.

[0007] The technical solution of this utility model to solve its technical problem is: a dual-start rotor assembly, comprising:

[0008] magnetic core;

[0009] Rotor housing, wherein the magnetic core is mounted on the surface of the rotor housing;

[0010] A rotating shaft, which is rotatably mounted inside the rotor seat;

[0011] It also includes a starting mechanism, wherein a starting cavity is provided inside the rotor seat, and the starting mechanism is disposed inside the starting cavity;

[0012] The starting mechanism consists of an outer starting ring and an inner starting ring that are rotatable relative to the starting cavity;

[0013] The starting chamber has a first driving rib protruding from its cavity wall, the outer ring of the outer starting ring has a first driven rib protruding from its outer ring portion, the inner ring of the outer starting ring also has a second driving rib protruding from its inner ring portion, the outer ring of the inner starting ring has a second driven rib protruding from its outer ring portion, and the rotating shaft is connected to the inner ring portion of the inner starting ring.

[0014] The rotor base has at least a first starting angle and a second starting angle;

[0015] The rotor base rotates at a first starting angle so that the first driving rib and the first driven rib form an interference fit, thereby forming a transmission between the outer starting ring and the rotor base;

[0016] The rotor seat rotates at the second starting angle so that the second driving rib and the second driven rib form an interference fit, thereby forming a transmission between the inner starting ring and the outer starting ring;

[0017] After the rotor seat rotates sequentially through the first starting angle and the second starting angle, it can drive the inner starting ring and its upper shaft to rotate.

[0018] Furthermore, two first damping columns are provided between the cavity wall of the starting chamber and the outer ring of the outer starting ring, and the two first damping columns are positioned on both sides of the first driving rib. When the first driving rib and the first driven rib form an interference fit, the first damping columns are blocked between the first driving rib and the first driven rib.

[0019] Furthermore, two second damping columns are provided between the inner ring of the outer starting ring and the outer ring of the inner starting ring, and the two second damping columns are positioned on both sides of the second driving rib. When the second driving rib and the second driven rib form an interference fit, the second damping columns are blocked between the second driving rib and the second driven rib.

[0020] Furthermore, both the first and second shock-absorbing columns are configured as rubber columns.

[0021] Furthermore, the rotor base, outer starting ring, and inner starting ring are configured to rotate about the same rotation axis.

[0022] Furthermore, the top of the rotor seat is recessed with a starting groove, and the top of the rotor seat is covered with a rotor cover. The starting cavity is formed by the groove wall of the starting groove and the inner wall of the rotor cover.

[0023] Furthermore, a ring of fitting grooves is formed on the outer wall of the rotor seat, and the magnetic core is embedded in the fitting grooves.

[0024] This utility model also includes a drainage pump, which includes the above-mentioned rotor assembly;

[0025] It also includes a pump body, a pump cover, a stator assembly, and an impeller; the pump body has a receiving cavity, and the rotor assembly is assembled in the receiving cavity;

[0026] The pump cover is placed on the upper end of the pump body, and the inner wall of the pump cover and the upper end face of the pump body form a drainage cavity. The pump cover is also provided with an inlet and an outlet that communicate with the drainage cavity.

[0027] The impeller is disposed in the drainage chamber, and an opening communicating with the receiving chamber is also provided on the upper end face of the pump body. The upper end of the rotating shaft extends into the drainage chamber through the opening and is connected to the impeller.

[0028] The stator assembly includes a coil and an iron core, one side of which extends into the accommodating cavity and surrounds the periphery of the magnetic core.

[0029] Furthermore, the impeller is sleeved on the upper end of the rotating shaft; a partition cover is also sleeved on the rotating shaft below the impeller, the partition cover is placed on the opening to separate the drainage chamber from the receiving chamber; a sealing ring is also connected to the lower side of the partition cover, and the inner ring of the sealing ring forms a sealing fit with the peripheral side wall of the rotating shaft.

[0030] Furthermore, the stator assembly includes a stator housing, within which a coil frame is assembled, the coil is wound around the coil frame, and a portion of the iron core passes through the coil frame, such that the coil surrounds the periphery of that portion of the iron core.

[0031] The startup process of this utility model:

[0032] When this drain pump is in use, the coils in the stator assembly are powered by an external power source. The current generates a magnetic field as it flows through the coils, and the magnetic core in the rotor assembly rotates under the influence of the magnetic field, which in turn drives the rotor base to rotate. The rotor base rotates relative to the starting mechanism. After the rotor base rotates through the first starting angle, the first driving rib on the rotor base interferes with the first driven rib on the outer starting ring, thus creating a transmission between the outer starting ring and the rotor base, and the outer starting ring rotates with the rotor base. When the rotor base drives the outer starting ring to rotate through the second starting angle, the second driving rib on the outer starting ring interferes with the second driven rib on the inner starting ring, thus creating a transmission between the inner starting ring and the outer starting ring, and the inner starting ring rotates with the inner starting ring. At this time, the rotor base continues to rotate, which can drive the outer starting ring and the inner starting ring to rotate synchronously with it. Since the shaft is connected to the inner starting ring, the shaft will rotate under the drive of the starting mechanism. This can generate negative pressure through the rotation of the impeller connected to the shaft, drawing water from the washing machine into the drain chamber and discharging it into the pipe.

[0033] The beneficial effects of this utility model are as follows:

[0034] 1. The starting mechanism in the rotor assembly consists of an outer starting ring and an inner starting ring. This means that the rotor seat needs to rotate through the first starting angle and the second starting angle in sequence during the starting process before it can start and drive the shaft to rotate. This increases the angle of rotation required for the rotor seat to start, thereby reducing the torque required for the drainage pump to start and effectively avoiding the problems of starting failure and starting delay during the use of the drainage pump.

[0035] 2. A first damping column is provided between the cavity wall of the starting chamber and the outer starting ring, and a second damping column is provided between the outer starting ring and the inner starting ring. The first and second damping columns can reduce the collision between the components during the transmission process between the rotor seat and the starting mechanism, avoid the generation of noise, and prevent the components from being damaged due to frequent collisions.

[0036] 3. The starting cavity inside the rotor assembly for installing the starting mechanism is formed by the starting groove opened on the rotor seat and the inner wall of the rotor cover, which makes the operation of the starting mechanism more stable and reduces the difficulty of assembling the starting mechanism inside the rotor assembly.

[0037] 4. The simple and clear structure of the entire drain pump allows for a smaller size, enabling it to be used in more models of washing machines and improving the applicability of this product.

[0038] 5. A partition cover and sealing ring are also installed inside the drainage pump to prevent water from flowing into the accommodating cavity during use, thus effectively solving the potential problem of damage to the rotor assembly due to water ingress. Attached Figure Description

[0039] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention.

[0040] Figure 2 This is an exploded view of Embodiment 1 of this utility model.

[0041] Figure 3 This is a longitudinal sectional view of Embodiment 1 of this utility model.

[0042] Figure 4 This is a cross-sectional view of Embodiment 1 of this utility model.

[0043] Figure 5 This is a schematic diagram of the cooperation between the outer start ring and the inner start ring in Embodiment 1 of this utility model.

[0044] Figure 6 This is a schematic diagram showing the separation between the rotor base and the magnetic core in Embodiment 1 of this utility model.

[0045] Figure 7 This is a schematic diagram showing the state changes of the rotor seat in cooperation with the starting mechanism during the startup process in Embodiment 1 of this utility model.

[0046] Figure 8 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0047] Figure 9 This is an exploded view of Embodiment 2 of this utility model.

[0048] Figure 10 This is a cross-sectional view of Embodiment 2 of this utility model.

[0049] Figure 11 This is a cross-sectional view of the stator assembly in Embodiment 2 of this utility model.

[0050] Numbered in the diagram: 1. Magnetic core; 2. Rotor seat; 3. Shaft; 4. Starting chamber; 5. Outer starting ring; 6. Inner starting ring; 7. First driving rib; 8. First driven rib; 9. Second driving rib; 10. Second driven rib; 11. First damping column; 12. Second damping column; 13. Starting slot; 14. Rotor cover; 15. Fitting slot; 16. Pump body; 17. Pump cover; 18. Stator assembly; 19. Impeller; 20. Receiving cavity; 21. Drainage cavity; 22. Inlet; 23. Outlet; 24. Opening; 25. Coil; 26. Iron core; 27. Separator cover; 28. Sealing ring; 29. ​​Stator housing; 30. Coil frame. Detailed Implementation

[0051] 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.

[0052] It should be understood that although the terms upper, middle, lower, top, one end, etc., appear in this document to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for ease of understanding, and are not used to define any directional or sequential restrictions.

[0053] Example 1

[0054] Combination Figures 1 to 7 The diagram shows a dual-start rotor assembly, comprising a magnetic core 1, a rotor base 2, and a rotating shaft 3; the magnetic core 1 is mounted on the surface of the rotor base 2; the rotating shaft 3 is rotatably inserted into the rotor base 2; it also includes a starting mechanism, wherein the rotor base 2 has a starting cavity 4, and the starting mechanism is disposed within the starting cavity 4; the starting mechanism consists of an outer starting ring 5 and an inner starting ring 6 rotatable relative to the starting cavity 4; a first driving rib 7 protrudes from the cavity wall of the starting cavity 4, a first driven rib 8 protrudes from the outer ring portion of the outer starting ring 5, a second driving rib 9 protrudes from the inner ring portion of the outer starting ring 5, a second driven rib 10 protrudes from the outer ring portion of the inner starting ring 6, and the rotating shaft 3 is connected to the inner ring portion of the inner starting ring 6.

[0055] Among them, such as Figure 7 As shown in the figure, in this embodiment, the rotor seat 2 has at least a first starting angle and a second starting angle; the rotor seat 2 rotates at the first starting angle so that the first driving rib 7 and the first driven rib 8 form an interference fit, thereby forming a transmission between the outer starting ring 5 and the rotor seat 2; the rotor seat 2 rotates at the second starting angle so that the second driving rib 9 and the second driven rib 10 form an interference fit, thereby forming a transmission between the inner starting ring 6 and the outer starting ring 5; after the rotor seat 2 rotates through the first starting angle and the second starting angle in sequence, it can drive the inner starting ring 6 and its upper shaft 3 to rotate.

[0056] Combination Figure 2 and Figure 4 As shown, in this embodiment, two first damping columns 11 are also provided between the cavity wall of the starting cavity 4 and the outer ring of the outer starting ring 5, and the two first damping columns 11 are placed on both sides of the first driving rib 7. When the first driving rib 7 and the first driven rib 8 form an interference fit, the first damping column 11 is blocked between the first driving rib 7 and the first driven rib 8.

[0057] Combination Figure 2 , Figure 4 and Figure 5 As shown, in this embodiment, two second damping columns 12 are provided between the inner ring of the outer starting ring 5 and the outer ring of the inner starting ring 6, and the two second damping columns 12 are placed on both sides of the second driving rib 9. When the second driving rib 9 and the second driven rib 10 form an interference fit, the second damping column 12 is blocked between the second driving rib 9 and the second driven rib 10.

[0058] In this embodiment, both the first damping column 11 and the second damping column 12 are configured as rubber columns.

[0059] Combination Figure 3 and Figure 4 As shown, in this embodiment, the rotor base 2, outer starting ring 5, and inner starting ring 6 are configured to rotate around the same rotation axis 3.

[0060] Combination Figure 2 , Figure 3 and Figure 6 As shown, in this embodiment, the top of the rotor seat 2 is recessed with a starting groove 13, and the top of the rotor seat 2 is covered and connected with a rotor cover 14. The starting cavity 4 is formed by the groove wall of the starting groove 13 and the inner wall of the rotor cover 14.

[0061] Among them, such as Figure 6 As shown in the figure, a ring of fitting grooves 15 is formed on the outer side wall of the rotor seat 2 in this embodiment, and the magnetic core 1 is embedded in the fitting grooves 15.

[0062] The advantage of this embodiment is that the starting mechanism inside the rotor assembly is set into two parts: an outer starting ring and an inner starting ring. This makes the rotor seat need to rotate a larger angle to drive the shaft to rotate when the rotor assembly starts, thereby effectively reducing the torque required to start the rotor assembly.

[0063] Example 2

[0064] Combination Figures 8 to 11The diagram shows a drainage pump, which includes the rotor assembly described in Embodiment 1 above; it also includes a pump body 16, a pump cover 17, a stator assembly 18, and an impeller 19; the pump body 16 has a receiving cavity 20, and the rotor assembly is assembled in the receiving cavity 20; the pump cover 17 covers the upper end of the pump body 16, and the inner wall of the pump cover 17 and the upper end face of the pump body 16 combine to form a drainage cavity 21, and the pump cover 17 also has an inlet 22 and an outlet 23 communicating with the drainage cavity 21; the impeller 19 is disposed in the drainage cavity 21, and the upper end face of the pump body 16 also has an opening 24 communicating with the receiving cavity 20, and the upper end of the rotating shaft 3 extends into the drainage cavity 21 through the opening 24 and is connected to the impeller 19; the stator assembly 18 includes a coil 25 and an iron core 26, one side of the iron core 26 extends into the receiving cavity 20 and surrounds the periphery of the magnetic core 1.

[0065] Combination Figure 9 and Figure 10 As shown, in this embodiment, the impeller 19 is sleeved on the upper end of the rotating shaft 3; a partition cover 27 is also sleeved on the rotating shaft 3 below the impeller 19, and the partition cover 27 is placed on the opening 24 to separate the drainage chamber 21 from the receiving chamber 20; a sealing ring 28 is also connected to the lower side of the partition cover 27, and the inner ring of the sealing ring 28 forms a sealing fit with the peripheral side wall of the rotating shaft 3.

[0066] Among them, such as Figure 11 As shown in the figure, the stator assembly 18 in this embodiment includes a stator housing 29, a coil frame 30 is assembled inside the stator housing 29, the coil 25 is wound around the coil frame 30, and a portion of the iron core 26 is inserted into the coil frame 30 so that the coil 25 surrounds the periphery of that portion of the iron core 26.

[0067] The startup process in this embodiment:

[0068] When this drainage pump is in use, the coil 25 inside the stator assembly 18 is powered by an external power source. The current flowing through the coil 25 generates a magnetic field, and the magnetic core 1 inside the rotor assembly rotates under the influence of this magnetic field, thereby driving the rotor base 2 to rotate. The rotor base 2 rotates relative to the starting mechanism. After the rotor base 2 has rotated through the first starting angle, the first driving rib 7 on the rotor base 2 interferes with the first driven rib 8 on the outer starting ring 5, thus creating a transmission between the outer starting ring 5 and the rotor base 2, causing the outer starting ring 5 to rotate with it. When the rotor base 2 drives the outer starting ring 5 together... After the rotation passes the second starting angle, the second driving rib 9 on the outer starting ring 5 and the second driven rib 10 on the inner starting ring 6 interfere with each other, thereby forming a transmission between the inner starting ring 6 and the outer starting ring 5 and causing them to rotate together. At this time, the rotor seat 2 continues to rotate, which can drive the outer starting ring 5 and the inner starting ring 6 to rotate synchronously with it. Since the rotating shaft 3 is connected to the inner starting ring 6, the rotating shaft 3 will rotate under the drive of the starting mechanism. In turn, the rotation of the impeller 19 connected to the rotating shaft 3 can generate negative pressure, which draws the water in the washing machine into the drain chamber 21 and discharges it into the pipe.

[0069] The advantage of this embodiment is that, as the drain pump of the washing machine, the use of a dual-start rotor assembly ensures that the drain pump will not fail to start or experience a delay during startup, making the washing machine run more smoothly.

[0070] The remaining structures, methods, and advantages of this embodiment are consistent with those of Embodiment 1 above, and will not be repeated here.

[0071] The above specific embodiments are merely explanations of the present utility model and are not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to the embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present utility model.

Claims

1. A dual-start rotor assembly, comprising: Magnetic core (1); Rotor base (2), the magnetic core (1) is mounted on the surface of rotor base (2); A rotating shaft (3) is rotatably inserted into a rotor seat (2); Its features are: It also includes a starting mechanism, wherein a starting cavity (4) is provided in the rotor seat (2), and the starting mechanism is disposed in the starting cavity (4); The starting mechanism consists of an outer starting ring (5) and an inner starting ring (6) that are rotatable relative to the starting cavity (4); The starting chamber (4) has a first driving rib (7) protruding on its cavity wall, the outer ring of the outer starting ring (5) has a first driven rib (8) protruding on its outer ring, the inner ring of the outer starting ring (5) also has a second driving rib (9) protruding on its inner ring, the outer ring of the inner starting ring (6) has a second driven rib (10) protruding on its outer ring, and the rotating shaft (3) is connected to the inner ring of the inner starting ring (6). The rotor seat (2) has at least a first starting angle and a second starting angle; The rotor seat (2) rotates at the first starting angle so that the first driving rib (7) and the first driven rib (8) form an interference fit, thereby forming a transmission between the outer starting ring (5) and the rotor seat (2); The rotor seat (2) rotates at the second starting angle so that the second driving rib (9) and the second driven rib (10) form an interference fit, thereby forming a transmission between the inner starting ring (6) and the outer starting ring (5); After the rotor seat (2) rotates through the first starting angle and the second starting angle in sequence, it can drive the inner starting ring (6) and its upper rotating shaft (3) to rotate.

2. The dual-start rotor assembly according to claim 1, characterized in that: Two first damping columns (11) are provided between the cavity wall of the starting cavity (4) and the outer ring of the outer starting ring (5), and the two first damping columns (11) are placed on both sides of the first driving rib (7). When the first driving rib (7) and the first driven rib (8) form an interference fit, the first damping column (11) is blocked between the first driving rib (7) and the first driven rib (8).

3. The dual-start rotor assembly according to claim 2, characterized in that: Two second damping columns (12) are provided between the inner ring of the outer starting ring (5) and the outer ring of the inner starting ring (6), and the two second damping columns (12) are placed on both sides of the second driving rib (9). When the second driving rib (9) and the second driven rib (10) form an interference fit, the second damping column (12) is blocked between the second driving rib (9) and the second driven rib (10).

4. A dual-start rotor assembly according to claim 3, characterized in that: Both the first damping column (11) and the second damping column (12) are configured as rubber columns.

5. A dual-start rotor assembly according to claim 1, characterized in that: The rotor base (2), outer starting ring (5) and inner starting ring (6) are configured to rotate about the same rotation axis (3).

6. A dual-start rotor assembly according to claim 1, characterized in that: The rotor seat (2) has a recessed starting groove (13) at its top end, and the rotor seat (2) is covered and connected to a rotor cover (14). The starting cavity (4) is formed by the groove wall of the starting groove (13) and the inner wall of the rotor cover (14).

7. A dual-start rotor assembly according to claim 1, characterized in that: A ring of fitting grooves (15) is provided on the outer side wall of the rotor seat (2), and the magnetic core (1) is embedded in the fitting grooves (15).

8. A drainage pump, characterized in that: Includes the rotor assembly described in any one of claims 1-7; It also includes a pump body (16), a pump cover (17), a stator assembly (18) and an impeller (19); the pump body (16) has a receiving cavity (20) and the rotor assembly is assembled in the receiving cavity (20); The pump cover (17) is placed on the upper end of the pump body (16), and the inner wall of the pump cover (17) and the upper end face of the pump body (16) are combined to form a drainage cavity (21). The pump cover (17) is also provided with an inlet (22) and an outlet (23) that communicate with the drainage cavity (21). The impeller (19) is disposed in the drainage chamber (21), and the upper end face of the pump body (16) is provided with an opening (24) that connects to the accommodating chamber (20). The upper end of the rotating shaft (3) extends into the drainage chamber (21) through the opening (24) and forms a connection with the impeller (19). The stator assembly (18) includes a coil (25) and an iron core (26), one side of which extends into the accommodating cavity (20) and surrounds the periphery of the magnetic core (1).

9. A drainage pump according to claim 8, characterized in that: The impeller (19) is fitted onto the upper end of the rotating shaft (3); a partition cover (27) is also fitted onto the rotating shaft (3) below the impeller (19), and the partition cover (27) is placed over the opening (24) to separate the drainage chamber (21) from the receiving chamber (20); a sealing ring (28) is also connected to the lower side of the partition cover (27), and the inner ring of the sealing ring (28) forms a sealing fit with the peripheral wall of the rotating shaft (3).

10. A drainage pump according to claim 9, characterized in that: The stator assembly (18) includes a stator housing (29), a coil frame (30) is assembled inside the stator housing (29), the coil (25) is wound around the coil frame (30), and a portion of the iron core (26) is inserted into the coil frame (30) so that the coil (25) surrounds that portion of the iron core (26).

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