Starting structure, rotor assembly and drainage pump

Abstract

The utility model discloses a starting structure, a rotor assembly and a draining pump. The starting structure comprises a motor shaft, a coupling, damping rubber, a clamping sheet and a magnetic ring injection molding assembly, the magnet ring injection molding assembly comprises an injection molding part and a magnet part, one end of the injection molding part is provided with a containing cavity for containing the coupler and the damping rubber, the motor shaft and the coupler are integrally injected, the coupler is provided with starting ribs protruding in the radial direction, the inner wall of the injection molding part is provided with limiting ribs, and starting parts are formed on the two sides of the damping rubber in the circumferential direction. The motor shaft rotates when the two starting parts abut against the starting ribs and the limiting ribs in the circumferential direction correspondingly, and the motor shaft has an idling angle. The starting rib and the limiting rib are arranged close to the two axial ends of the damping rubber respectively, the limiting rib does not exceed the axial end face of the damping rubber, and the ratio of the height A of the limiting rib to the height H1 of the damping rubber ranges from 0.37 to 0.39. According to the utility model, on the premise that the low-voltage starting capability is ensured, the better durability of the rotor assembly is ensured, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of micro motors, in particular to a starting structure, a rotor assembly and a drainage pump. Background Art

[0002] Existing washing machines take into account the unstable factors of power grids in different countries and regions: the grid voltage will drop to below 220V under high load operation, usually below 180V. Therefore, the drain pump not only needs the traditional drainage function, but also requires the low-voltage starting capability of the drain pump to meet the requirements during the operation of the washing machine.

[0003] The drainage pump is started by the starting cavity of the rotor assembly. The rotor assembly is provided with a starting cavity, which is composed of a magnetic ring injection molding assembly, a motor shaft, a shock-absorbing rubber, a coupling, and an impeller. The low-pressure starting capability of the drainage pump is related to the axial movement and the idling angle of the rotating shaft in the starting cavity. The axial movement of the rotor assembly is related to the starting cavity height, the shock-absorbing rubber height, the coupling injection molding body pan head height, and the card boss height. At the same time, the axial movement, the idling angle of the rotating shaft in the starting cavity, and the reasonable design of the height dimensions of each component in the starting cavity also affect the service life of the drainage pump.

[0004] Traditional drainage pumps only consider the requirements of low-pressure starting capability, but do not fully consider the service life requirements of the rotor assembly. As a result, drainage pumps often fail to drain due to problems such as the rotor assembly getting stuck and the shock-absorbing rubber being crushed.

[0005] Therefore, it is necessary to develop a starting structure, a rotor assembly and a drainage pump with good low-pressure starting capability and a long service life. Utility Model Content

[0006] In order to solve the technical problem that the drainage pump in the prior art only considers the requirement of low-pressure starting capability, but does not fully consider the service life requirement of the rotor assembly, resulting in the drainage pump often failing to drain due to problems such as the rotor assembly being stuck and the shock-absorbing rubber being crushed, the utility model provides a starting structure, a rotor assembly and a drainage pump to solve the above problem.

[0007] The utility model proposes a starting structure, comprising a motor shaft, a coupling, a shock-absorbing rubber, a card and a magnetic ring injection molding component; the magnetic ring injection molding component comprises an injection molding part and a magnet part, one end of the injection molding part has a cavity for accommodating the coupling and the shock-absorbing rubber, and the card seals the coupling and the shock-absorbing rubber in the cavity; the motor shaft and the coupling are integrally injection-molded, the coupling has radially protruding starting ribs, the inner wall of the injection molding part has limiting ribs, the circumferential sides of the shock-absorbing rubber form a starting part, the motor shaft rotates when the two starting parts are circumferentially abutted against the starting ribs and the limiting ribs respectively, and the motor shaft has an idling angle; the starting ribs and the limiting ribs are respectively arranged close to the axial ends of the shock-absorbing rubber, the limiting ribs do not exceed the axial end surface of the shock-absorbing rubber, and the ratio of the height A of the limiting ribs to the height H1 of the shock-absorbing rubber is in the range of 0.37-0.39.

[0008] Furthermore, the ratio of the height A of the limiting rib to the height H1 of the shock absorbing rubber is 0.38.

[0009] Furthermore, the start-up rib does not extend beyond the axial end surface of the shock-absorbing rubber, and the ratio of the height H2 of the start-up rib to the height H1 of the shock-absorbing rubber is in the range of 0.77-0.79.

[0010] Furthermore, the ratio of the height H2 of the start rib to the height H1 of the shock absorbing rubber is 0.78.

[0011] Furthermore, the coupling also includes a tubular body and a disc head located at one end of the tubular body, the starting rib is located on the outer circumference of the tubular body, and the axial limit of the shock-absorbing rubber is located between the disc head and the inner bottom surface of the cavity.

[0012] Furthermore, the height H0 of the cavity ranges from 8.55mm to 8.65mm; the height H1 of the shock-absorbing rubber ranges from 5.9mm to 6.05mm; the height H4 of the disk head ranges from 1.45mm to 1.55mm; and the height H3 of the card extending into the cavity ranges from 0.35mm to 0.45mm.

[0013] Furthermore, the idling angle of the motor shaft is 290°-380°.

[0014] Furthermore, the axial length of the magnet portion is 24 mm-28 mm.

[0015] Furthermore, the axial length of the magnet portion is 27 mm.

[0016] The utility model also provides a rotor assembly, comprising the above-mentioned starting structure.

[0017] The utility model also provides a drainage pump, comprising the rotor assembly mentioned above.

[0018] The beneficial effects of the utility model are:

[0019] (1) The starting structure, rotor assembly and drainage pump described in the utility model ensure that the rotor assembly has better durability and extends the service life cycle while ensuring low-pressure starting capability.

[0020] (2) The starting structure, rotor assembly and drainage pump described in the utility model ensure the force-bearing area of ​​the damping rubber by limiting the height of the limit rib and the height of the damping rubber, reduce the pressure P on the damping rubber, and prevent the damping rubber from being broken. This can ensure that the rotor assembly has better durability and extend its service life cycle. At the same time, the length and volume of the drainage pump are convenient for customers to install on the washing machine without interfering with other parts on the washing machine.

[0021] (3) The utility model reasonably designs the height values ​​of the components in the starting structure so that the axial movement of the rotor assembly is maintained between 0.4 and 0.8 mm, which not only ensures the low-pressure starting capability of the drainage pump but also prevents foreign matter from being entangled in the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a stereogram of a specific implementation of the rotor assembly described in the utility model;

[0024] Figure 2 is an exploded view of a specific embodiment of the rotor assembly of the utility model;

[0025] Figure 3 It is a three-dimensional diagram of the starting structure described in the utility model;

[0026] Figure 4 This is a schematic diagram of the assembly of the motor shaft and the coupling in the utility model;

[0027] Figure 5 It is a three-dimensional diagram of the coupling in the utility model;

[0028] Figure 6 It is a three-dimensional diagram of the magnetic ring injection molding component in the utility model;

[0029] Figure 7 is a schematic diagram of the sliding area of ​​the shock-absorbing rubber in the cavity;

[0030] Figure 8 It is a three-dimensional picture of the shock-absorbing rubber;

[0031] Fig. 9 It is a schematic diagram of the height dimensions of the limiting ribs and the shock absorbing rubber in the utility model;

[0032] Fig.10It is a schematic diagram of the height dimensions of the coupling and the shock-absorbing rubber in the utility model;

[0033] Fig.11 It is a schematic diagram of the height dimensions of the cavity and the pan head in the utility model;

[0034] Fig.12 yes Fig.11 The enlarged image at a in the middle;

[0035] Fig.13 This is a table showing the relationship between axial movement and starting voltage.

[0036] In the figure, 1. motor shaft, 2. coupling, 201. starting rib, 202. tubular body, 203. pan head, 3. shock-absorbing rubber, 301. starting part, 302. limiting end, 4. card, 401. boss, 5. magnetic ring injection molding component, 501. injection molding part, 502. magnet part, 503. cavity, 504. limiting rib, 5041. limiting wall, 6. impeller, 7. bearing assembly. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] Embodiment 1

[0039] like Figure 2-Figure 8 As shown, a starting structure includes a motor shaft 1, a coupling 2, a damping rubber 3, a card 4 and a magnetic ring injection molding component 5; the magnetic ring injection molding component 5 includes an injection molding part 501 and a magnet part 502, the injection molding part 501 and the magnet part 502 are axially connected, and both are columnar structures, the magnet part 502 is exposed to the outside and is used to induce an electromagnetic field, and one end of the injection molding part 501 has a cavity 503 for accommodating the coupling 2 and the damping rubber 3, which is usually called a starting cavity, such as Figure 3 and Figure 6 As shown, the magnet part 502 is located at one end of the injection part 501 , the cavity 503 is located at the other end of the injection part 501 , and the card 4 seals the coupling 2 and the shock-absorbing rubber 3 in the cavity 503 .

[0040] The motor shaft 1 and the coupling 2 are integrally injection molded. The motor shaft 1 passes through the magnetic ring injection molding assembly 5 in the axial direction. The coupling 2 has a radially protruding starting rib 201, which protrudes outward from the motor shaft 1. The inner wall of the injection molding part 501 has a limiting rib 504, which protrudes from the inner wall of the cavity 503 toward the center direction of the injection molding part 501. Figure 6As shown, the two sides of the limiting rib 504 are a pair of limiting walls 5041, and the limiting walls 5041 define the sliding area of ​​the shock absorbing rubber 3 (such as Figure 7 shown).

[0041] The shock absorbing rubber 3 is provided with a starter portion 301 on both sides of the circumference. Figure 8 As shown, the shock-absorbing rubber 3 is a horseshoe-shaped structure, and the motor shaft 1 rotates when the two starting parts 301 are circumferentially abutted against the starting rib 201 and the limiting rib 504, and the motor shaft 1 has an idling angle; the starting rib 201 and the limiting rib 504 are respectively arranged close to the axial ends of the shock-absorbing rubber 3, so it is necessary to rely on the shock-absorbing rubber 3 to transmit torque from the limiting rib 504 to the starting rib 201.

[0042] During operation, the coil assembly of the motor generates a magnetic field after being energized, which generates a force on the magnetic ring injection molding assembly 5. The limiting wall 5041 of the magnetic ring injection molding assembly 5 pushes the starting part 301 of the shock-absorbing rubber 3. The shock-absorbing rubber 3 slides in the inner cavity under the thrust until the other starting part 301 hits the starting rib 201 of the coupling 2, thereby causing the impeller 6 installed at the end of the motor shaft 1 to rotate.

[0043] like Fig. 9 As shown, the limiting rib 504 does not exceed the axial end surface of the damping rubber 3, and the ratio of the height A of the limiting rib 504 to the height H1 of the damping rubber 3 is in the range of 0.37-0.39. The ratio of the height A of the limiting rib 504 to the height H1 of the damping rubber 3 is preferably 0.38.

[0044] In the conventional starting structure, the ratio of the height A of the limiting rib 504 to the height H1 of the damping rubber 3 is less than 0.37. In the utility model, the ratio of the height A of the limiting rib 504 to the height H1 of the damping rubber 3 is between 0.37 and 0.39, which can improve the service life of the rotor assembly. The reason is that the height of the limiting rib 504 is equal to the axial length of the contact surface between the limiting rib 504 and the damping rubber 3. The greater the height of the limiting rib 504, the smaller the force-bearing area of ​​the damping rubber 3.

[0045] When the ratio of the height A of the limiting rib 504 to the height H1 of the shock-absorbing rubber 3 is less than 0.37, the force area S of the shock-absorbing rubber 3 will decrease. During the starting process of the drainage pump, the starting torque F is certain. Therefore, according to the formula P=F / S, when the force area S of the shock-absorbing rubber 3 decreases, the pressure P on the shock-absorbing rubber 3 will increase. During long-term use, the shock-absorbing rubber 3 will be broken, resulting in the failure of the starting chamber and affecting the life cycle of the entire machine.

[0046] When the ratio of the height A of the limiting rib 504 to the height H1 of the shock-absorbing rubber 3 is greater than 0.39, the height of the limiting rib 504 will increase. In order to avoid interference between the limiting rib 504 and the coupling 2, the height of the shock-absorbing rubber 3 also needs to be increased to allow sufficient space inside the cavity 503. As a result, the length of the magnetic ring injection molding assembly 5 will increase, which will lead to an increase in the length and volume of the entire machine. During the operation of the washing machine, it will interfere with other components on the washing machine, affecting the installation of the customer's washing machine drain pump.

[0047] Under the premise of maintaining the traditional axial movement and idling angle of the motor shaft 1 (meeting the starting requirements of the drainage pump), this embodiment only limits the ratio range of the height of the limiting rib 504 and the height of the shock-absorbing rubber 3, thereby ensuring the durability and service life cycle of the rotor assembly and avoiding interference with other components on the washing machine, thereby ensuring installation convenience.

[0048] Similarly, if Fig.10 As shown, the starter rib 201 does not exceed the axial end surface of the damping rubber 3, and the ratio of the height H2 of the starter rib 201 to the height H1 of the damping rubber 3 is in the range of 0.77-0.79, and the preferred ratio is 0.78.

[0049] In the conventional drainage pump, the ratio of the height H2 of the starter rib 201 to the height H1 of the damping rubber 3 is less than 0.77. The embodiment improves the durability and service life of the rotor assembly by adjusting the ratio. The reason is that the height of the starter rib 201 is equal to the axial length of the contact surface between the starter rib 201 and the damping rubber 3. The greater the height of the starter rib 201, the smaller the force-bearing area of ​​the damping rubber 3.

[0050] When the ratio of the height of the starting rib 201 to the height of the shock-absorbing rubber 3 is less than 0.77, the contact area S between the starting rib 201 and the shock-absorbing rubber 3 will become smaller. According to the formula P=F / S, the starting torque F remains unchanged, then the pressure P on the starting rib 201 will increase, causing the starting rib 201 of the coupling 2 to break during use, thereby reducing the durability and service life cycle of the entire starting chamber structure.

[0051] When the ratio of the height of the starting rib 201 to the height of the shock-absorbing rubber 3 is greater than 0.79, the height of the starting rib 201 will increase. In order to avoid interference between the limiting rib 504 and the coupling 2, the height of the shock-absorbing rubber 3 also needs to be increased to allow sufficient space inside the cavity 503. As a result, the length of the magnetic ring injection molding assembly 5 will increase. After the length of the magnetic ring injection molding assembly 5 increases, the length and volume of the entire machine will increase, which will affect the installation of the customer's washing machine drain pump and interfere with other components on the washing machine during operation.

[0052] In this embodiment, the height A of the limiting rib 504 is 2.3 mm, the height H2 of the starting rib 201 is 4.7 mm, and the height H1 of the shock-absorbing rubber 3 is 6 mm.

[0053] like Figure 5 As shown, the coupling 2 further includes a tubular body 202 and a pan head 203 located at one end of the tubular body 202, the starter rib 201 is located on the outer circumference of the tubular body 202, and the damping rubber 3 is axially limited between the pan head 203 and the inner bottom surface of the cavity 503. Figure 8 The two limiting ends 302 of the middle damping rubber 3 are respectively in contact with the end surface of the pan head 203 and the inner bottom surface of the cavity 503 .

[0054] Embodiment 2

[0055] The starting ability of the drainage pump is related to the axial movement of the rotor assembly. When the axial movement is less than 0.4mm, the low-voltage starting cannot meet the voltage requirement of less than 180V. The axial movement of the traditional drainage pump is greater than 0.8mm. Although it meets the low-voltage starting ability, it is easy for foreign objects to be entangled at the impeller 6 during the use of the drainage pump, causing the rotor assembly to get stuck and the drainage pump to fail to start and drain. For this reason, based on the above embodiment, the preferred range of the axial movement of the rotor assembly in this embodiment is 0.4mm-0.8mm.

[0056] like Fig.11 As shown, the axial movement of the rotor assembly is related to the height of the cavity 503, the height of the shock absorbing rubber 3, the height of the disc head 203 of the coupling 2, and the height of the card 4 extending into the cavity 503. Fig.12 As shown, the center of the card 4 has a boss 401 extending into the cavity 503, and the boss 401 is directly opposite to the end face of the pan head 203. In this embodiment, the height H0 of the cavity 503 ranges from 8.55mm to 8.65mm; the height H1 of the shock-absorbing rubber 3 ranges from 5.9mm to 6.05mm; the height H4 of the pan head 203 ranges from 1.45mm to 1.55mm; the height H3 of the card 4 extending into the cavity 503 (that is, the height of the boss 401) ranges from 0.35mm to 0.45mm. When these size requirements are met, the axial movement of the rotor assembly can be kept between 0.4mm and 0.8mm, so that the low-pressure starting performance of the rotor assembly meets the customer test requirements and the customer foreign body test requirements.

[0057] In this embodiment, the height H0 of the cavity 503 is 8.55 mm, the height H1 of the shock-absorbing rubber 3 is 6 mm, the height H4 of the disc head 203 is 1.5 mm, and the height H3 of the boss 401 is 0.4 mm.

[0058] Embodiment 3

[0059] The starting capability of the drainage pump is also related to the idling angle of the motor shaft 1. The idling angle of the motor shaft 1 of the conventional drainage pump is less than 250°. The larger the idling angle of the motor shaft 1, the better the low-voltage starting capability. When the idling angle of the motor shaft 1 is less than 250°, in order to meet the low-voltage starting requirements of customers, compensation needs to be made to increase the magnetization length of the magnet part 502, which will increase the cost of parts and increase the volume of the drainage pump.

[0060] Therefore, in this embodiment, the idling angle of the motor shaft 1 is 290°-380°. On this basis, the axial length of the magnet portion 502 does not need to be too long and can be set to 24mm-28mm. In this embodiment, the axial length of the magnet portion 502 is 27mm.

[0061] Since a reduction in the length of the magnet portion 502 will result in a smaller starting torque, thereby reducing the low-voltage starting performance, this embodiment ensures the length of the magnet portion 502 by increasing the idling angle, which can not only maintain the excellent starting performance of the motor, but also reduce the volume of the entire machine to reduce costs.

[0062] from Fig.13 It can be seen that with the increase of the axial movement of the rotor assembly, the starting voltage of the whole machine decreases. Ensuring that the axial movement is between 0.4mm-0.8mm can ensure that the starting voltage of the drainage pump is between 170V and 180V, which can not only meet the customer's market starting voltage requirements (the market demand starting voltage is less than 180V), but also ensure that the impeller 6 of the drainage pump will not be entangled by foreign objects when working, avoiding the rotor assembly from getting stuck and not working and not draining.

[0063] Embodiment 4

[0064] A rotor assembly comprises the above-mentioned starting structure. Figure 1 and Figure 2 As shown, the rotor assembly includes an impeller 6, a bearing assembly 7, and a card 4, a shock-absorbing rubber 3, a magnetic ring injection molding assembly 5, a motor shaft 1 and a coupling 2 in a starting structure.

[0065] Embodiment 5

[0066] The utility model also provides a drainage pump, comprising the rotor assembly mentioned above.

[0067] The impeller 6 is fixedly connected to the motor shaft 1, and the bearing assembly 7 is mounted on the motor shaft 1. The rotor assembly is rotatably connected to the motor housing of the drainage pump through the bearing assembly 7.

[0068] In the description of the present invention, it is necessary to understand that the terms "center", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments.

[0070] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A startup structure, characterized in that: It comprises a motor shaft (1), a coupling (2), a shock-absorbing rubber (3), a card (4) and a magnetic ring injection molding component (5); The magnetic ring injection molding component (5) comprises an injection molding part (501) and a magnet part (502); one end of the injection molding part (501) has a cavity (503) for accommodating a coupling (2) and a shock-absorbing rubber (3); and a card (4) seals the coupling (2) and the shock-absorbing rubber (3) in the cavity (503); The motor shaft (1) and the coupling (2) are integrally injection molded, the coupling (2) has a radially protruding starting rib (201), the inner wall of the injection molded portion (501) has a limiting rib (504), the shock-absorbing rubber (3) forms a starting portion (301) on both sides in the circumferential direction, the motor shaft (1) rotates when the two starting portions (301) are in circumferential contact with the starting rib (201) and the limiting rib (504), and the motor shaft (1) has an idling angle; The starting rib (201) and the limiting rib (504) are respectively arranged close to the axial ends of the shock-absorbing rubber (3); the limiting rib (504) does not extend beyond the axial end surface of the shock-absorbing rubber (3); and the ratio of the height A of the limiting rib (504) to the height H1 of the shock-absorbing rubber (3) is in the range of 0.37-0.

39.

2. The starting structure according to claim 1, characterized in that: The ratio of the height A of the limiting rib (504) to the height H1 of the shock absorbing rubber (3) is 0.

38.

3. The starting structure according to claim 1, characterized in that: The starter rib (201) does not extend beyond the axial end surface of the shock-absorbing rubber (3), and the ratio of the height H2 of the starter rib (201) to the height H1 of the shock-absorbing rubber (3) is in the range of 0.77-0.

79.

4. The starting structure according to claim 3, characterized in that: The ratio of the height H2 of the starting rib (201) to the height H1 of the shock-absorbing rubber (3) is 0.

78.

5. The starting structure according to claim 1, characterized in that: The coupling (2) further comprises a tubular body (202) and a disc head (203) located at one end of the tubular body (202); the starter rib (201) is located on the outer peripheral surface of the tubular body (202); and the shock-absorbing rubber (3) is axially limited between the disc head (203) and the inner bottom surface of the cavity (503).

6. The starting structure according to claim 5, characterized in that: The height H0 of the cavity (503) is in the range of 8.55 mm to 8.65 mm; The height H1 of the shock-absorbing rubber (3) ranges from 5.9 mm to 6.05 mm; The height H4 of the pan head (203) ranges from 1.45 mm to 1.55 mm; The height H3 of the card (4) extending into the cavity (503) is in the range of 0.35 mm to 0.45 mm.

7. The starting structure according to claim 1, characterized in that: The idling angle of the motor shaft (1) is 290°-380°.

8. The starting structure according to claim 7, characterized in that: The axial length of the magnet portion (502) is 24 mm-28 mm.

9. The starting structure according to claim 8, characterized in that: The axial length of the magnet portion (502) is 27 mm.

10. A rotor assembly, characterized in that: The invention comprises the starting structure according to any one of claims 1 to 9.

11. A drainage pump, characterized in that: Includes the rotor assembly as claimed in claim 10.

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