Starting mechanism and drainage pump

Abstract

The invention discloses a starting mechanism and a draining pump, the starting mechanism comprises a rotor unit, an impeller unit and a transmission unit, the rotor unit and the impeller unit are in transmission connection through the transmission unit, the impeller unit comprises an impeller body, and the transmission unit comprises a transmission shaft and an elastic transmission part; one end part of the transmission shaft is in clearance fit with the impeller body or the rotor unit, and the other end part of the transmission shaft is fixedly connected with the rotor unit or the impeller body; the elastic transmission part comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected or in limited connection with the transmission shaft, and the second connecting part is fixedly connected or in limited connection with the impeller body or the rotor unit which is in clearance fit with the transmission shaft. According to the scheme, the problem that smooth starting cannot be achieved due to large load is solved.

Description

Technical Field

[0001] The present application relates to the technical field of drainage pumps, and in particular to a starting mechanism and a drainage pump using the starting mechanism. Background Art

[0002] A drainage pump is a widely used pump device. For example, drainage pumps are generally installed on household appliances such as washing machines and dishwashers.

[0003] At present, mainstream drainage pumps generally use the asymmetric design of the motor's silicon steel pole shoes to provide the rotor with an initial starting force. This initial starting force is relatively small, and it is easy to fail to start normally under load.

[0004] Therefore, how to ensure that the drainage pump can start normally even under load is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To solve the above technical problems, the present application provides a starting mechanism, comprising a rotor unit, an impeller unit, and a transmission unit, wherein the rotor unit and the impeller unit are connected to each other through the transmission unit, the impeller unit comprising an impeller body, the transmission unit comprising a transmission shaft and an elastic transmission member, wherein the elastic transmission member is at least partially sleeved on the outer periphery of the transmission shaft;

[0006] One end of the transmission shaft is fixedly connected to the rotor unit, and the other end of the transmission shaft is in clearance fit with the impeller body;

[0007] The elastic transmission member includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected or position-limitingly connected to the transmission shaft, and the second connecting portion is fixedly connected or position-limitingly connected to the first mounting groove portion of the impeller body.

[0008] The present application also provides a starting mechanism, comprising a rotor unit, an impeller unit, and a transmission unit, wherein the rotor unit and the impeller unit are connected to each other through the transmission unit, the impeller unit comprising an impeller body, the transmission unit comprising a transmission shaft and an elastic transmission member, wherein the elastic transmission member is at least partially sleeved on an outer periphery of the transmission shaft;

[0009] One end of the transmission shaft is fixedly connected to the impeller body, and the other end of the transmission shaft is clearance-fitted with the rotor unit;

[0010] The elastic transmission member includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected or position-limitingly connected to the transmission shaft, and the second connecting portion is fixedly connected or position-limitingly connected to the second mounting groove portion of the rotor unit.

[0011] In addition, the present application also provides a drainage pump, which includes the starting mechanism provided in the present application.

[0012] The starting mechanism provided in the present application and the drainage pump using the starting mechanism hardly need to bear the load of the impeller unit when the rotor unit just starts to rotate, but only need to bear the load of the impeller unit after rotating under small load or no load. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a disassembled diagram of the first embodiment of the starting mechanism provided in this application;

[0014] Figure 2 for Figure 1 A cross-sectional view of the embodiment shown in the assembled state;

[0015] Figure 3 for Figure 1 A three-dimensional diagram of the elastic transmission member;

[0016] Figure 4 for Figure 1 A three-dimensional view of the middle impeller body;

[0017] Figure 5 A schematic diagram of the second connecting portion of the elastic transmission member being inserted into the second connecting groove of the impeller body;

[0018] Figure 6 This is a disassembled diagram of the second embodiment of the starting mechanism provided in this application;

[0019] Figure 7 for Figure 6 A three-dimensional view of the rotor plastic ring.

[0020] The following are the descriptions of the reference numerals:

[0021] 100 rotor unit, 101 rotor plastic ring, 101a second mounting groove, Y1 second notch, Y2 second circumferential groove wall, Y3 second protrusion, 102 rotor magnetic ring, 103 rotor end cover, 103a rotor end cover through hole;

[0022] 200 impeller unit, 201 impeller body, 201a first mounting groove portion, X1 first notch, X2 first circumferential groove wall, X3 first protrusion, 201b transmission shaft connecting hole, 202 impeller end cover, 202a impeller end cover through hole, 203 sealing ring;

[0023] 300 transmission unit, 301 transmission shaft, 301a first end, 301b second end, 302 elastic transmission member, 302a first connecting portion, 302b second connecting portion, 302c spiral body;

[0024] A: first connecting groove, B: first side notch, C: second connecting groove, D: second side notch. DETAILED DESCRIPTION

[0025] The present application provides a starting mechanism and a drainage pump using the starting mechanism. In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] First embodiment (refer to Figure 1-Figure 5 ):

[0027] like Figure 1 As shown, the starting mechanism includes a rotor unit 100, an impeller unit 200, and a transmission unit 300. The transmission unit 300 connects the rotor unit 100 and the impeller unit 200, enabling torque transmission between the rotor unit 100 and the impeller unit 200 through the transmission unit 300. The impeller unit 200 includes an impeller body 201. The transmission unit 300 includes a transmission shaft 301 and an elastic transmission member 302. The elastic transmission member 302 is at least partially sleeved on the outer periphery of the transmission shaft 301.

[0028] like Figure 2 As shown, the first end 301a of the transmission shaft 301 is clearance-fitted with the impeller body 201 , and the second end 301b of the transmission shaft 301 is fixedly connected to the rotor unit 100 .

[0029] like Figure 3 As shown, the elastic transmission member 302 includes a first connection portion 302a and a second connection portion 302b. The first connection portion 302a is fixedly connected or position-limitedly connected to the transmission shaft 301, and the second connection portion 302b is connected to the first mounting groove portion 201a of the impeller body 201 (see Figure 4 ) Fixed connection or limited connection.

[0030] Since one end of the transmission shaft 301 is fixedly connected to the rotor unit 100, and the other end of the transmission shaft 301 is loosely fitted with the impeller body 201, the first connection portion 302a of the elastic transmission member 302 is fixedly connected or limit-connected to the transmission shaft 301, and the second connection portion 302b of the elastic transmission member 302 is fixedly connected or limit-connected to the impeller body 201. Therefore, when the rotor unit 100 rotates under the initial starting force of the motor, the transmission shaft 301 rotates with the rotor unit 100, and the first connection portion 302a of the elastic transmission member 302 rotates with the transmission shaft 301. At this time, the elastic energy of the elastic transmission member 302 is not enough to overcome the load of the impeller unit 200, so the second connection portion 302b of the elastic transmission member 302 and the impeller unit 200 are stationary. At this stage, as the transmission shaft 301 rotates, the elastic transmission member 302 gradually accumulates elastic energy until the elastic energy of the elastic transmission member 302 is sufficient to overcome the load of the impeller unit 200. When the elastic energy of the elastic transmission member 302 is sufficient to overcome the load of the impeller unit 200 , the second connection portion 302 b of the elastic transmission member 302 and the impeller unit 200 begin to rotate.

[0031] As can be seen from the above description, the elastic transmission member 302 provides a flexible transmission effect, so that when the rotor unit 100 begins to rotate, the impeller unit 200 does not rotate with it. Therefore, when the rotor unit 100 first rotates, it does not need to bear the load of the impeller unit 200. Instead, it needs to bear the load of the impeller unit 200 after rotating a certain angle under light or no load. This avoids the problem of a heavy load preventing a smooth startup. In addition, the elastic transmission member 302 acts as a buffer and reduces noise, which reduces startup noise and vibration.

[0032] More specifically, Figure 3 As shown, the elastic transmission member 302 further includes a spiral body portion 302c. Figure 2 As shown, the spiral body portion 302c is sleeved on the outer circumference of the transmission shaft 301. The first connecting portion 302a extends from one end of the spiral body portion 302c into the enclosed space of the spiral body portion 302c, and the extension direction is roughly perpendicular to the length direction of the spiral body portion 302c. The second connecting portion 302b extends from the other end of the spiral body portion 302c to the outside of the enclosed space of the spiral body portion 302c, and the extension direction is roughly perpendicular to the length direction of the spiral body portion 302c. When the first connecting portion 302a and the second connecting portion 302b rotate in opposite directions relative to each other, the spiral body portion 302c accumulates elastic energy. This elastic transmission member 302 occupies a small layout space and has a large adjustable range of stiffness. By adjusting the stiffness of this elastic transmission member 302, the rotor unit 100 can be rotated more than 360° under light load conditions before taking on the load of the impeller unit 200.

[0033] More specifically, Figure 2As shown, the first end 301a of the transmission shaft 301 is provided with a first connecting groove A. The first connecting portion 302a of the elastic transmission member 302 is inserted into the first connecting groove A, thereby connecting the transmission shaft 301 and the first connecting portion 302a. When the first connecting portion 302a rotates, it contacts the side walls of the first connecting groove A, allowing the first connecting portion 302a and the transmission shaft 301 to rotate together. This connection method facilitates the assembly of the transmission shaft 301 and the elastic transmission member 302.

[0034] More specifically, Figure 2 As shown, the first connecting groove portion A can extend axially from the end surface of the clearance-fit end portion of the transmission shaft 301 toward the middle portion of the transmission shaft 301, and a first side notch B for inserting the first connecting portion 302a is formed on the outer circumferential surface of the clearance-fit end portion. This makes it easier to machine the first connecting groove portion A and facilitates assembly of the transmission shaft 301 and the elastic transmission member 302.

[0035] More specifically, Figure 4 As shown, a second connecting groove C is provided in the first mounting groove 201a. Figure 5 As shown, the elastic transmission member 302 is at least partially inserted into the first mounting groove 201a, and the second connecting portion 302b of the elastic transmission member 302 is inserted into the second connecting groove C, thereby connecting the second connecting portion 302b to the impeller body 201. When the second connecting portion 302b rotates, it contacts the side walls of the second connecting groove C of the impeller unit 200, allowing the second connecting portion 302b and the impeller unit 200 to rotate together. This connection method facilitates the assembly of the elastic transmission member 302 and the impeller body 201.

[0036] More specifically, Figure 4 As shown, the first mounting groove portion 201a is provided with a first notch X1 at one end of the impeller body 201. A first protrusion X3 is provided within the first mounting groove portion 201a. The first mounting groove portion 201a has a first circumferential groove wall X2 disposed around the outer circumference of the transmission shaft 301, and the first protrusion X3 protrudes from the first circumferential groove wall X2 into the first mounting groove portion 201a. A second connecting groove portion C is provided in the first protrusion X3. The second connecting groove portion C forms a second side notch D on the side of the first protrusion X3 near the transmission shaft 301, into which the second connecting portion 302b passes. The second connecting groove portion C extends axially from the end of the first protrusion X3 near the first notch X1 toward the other end of the first protrusion X3. This makes it easier to machine the second connecting groove portion C and facilitates assembly of the impeller body 201 and the elastic transmission member 302.

[0037] More specifically, Figure 2As shown, the impeller unit 200 further includes an impeller end cover 202. The impeller end cover 202 is positioned at the first notch X1 of the first mounting groove 201a. The impeller end cover 202 defines an impeller end cover through-hole 202a. The first end 301a of the drive shaft 301 axially passes through the impeller end cover through-hole 202a, the inner cavity of the first mounting groove 201a, and the drive shaft connection hole 201b. Seal rings 203 are provided between the impeller end cover 202 and the drive shaft 301, and between the impeller end cover 202 and the impeller body 201.

[0038] Second embodiment (refer to Figure 6 and Figure 7 ):

[0039] like Figure 6 As shown, the starting mechanism includes a rotor unit 100, an impeller unit 200, and a transmission unit 300. The transmission unit 300 connects the rotor unit 100 and the impeller unit 200, enabling torque transmission between the rotor unit 100 and the impeller unit 200 through the transmission unit 300. The impeller unit 200 includes an impeller body 201. The transmission unit 300 includes a transmission shaft 301 and an elastic transmission member 302. The elastic transmission member 302 is at least partially sleeved on the outer periphery of the transmission shaft 301.

[0040] like Figure 6 As shown, the first end portion 301 a of the transmission shaft 301 is fixedly connected to the impeller body 201 , and the second end portion 301 b of the transmission shaft 301 is clearance-fitted with the rotor unit 100 .

[0041] like Figure 6 As shown, the elastic transmission member 302 includes a first connection portion 302a and a second connection portion 302b. The first connection portion 302a is fixedly connected or position-limitedly connected to the transmission shaft 301, and the second connection portion 302b is connected to the second mounting groove portion 101a of the rotor unit 100 (see Figure 7 ) Fixed connection or limited connection.

[0042] Since one end of the transmission shaft 301 is fixedly connected to the impeller body 201, and the other end of the transmission shaft 301 is loosely fitted with the rotor unit 100, the first connection portion 302a of the elastic transmission member 302 is fixedly connected or limit-connected to the transmission shaft 301, and the second connection portion 302b of the elastic transmission member 302 is fixedly connected or limit-connected to the rotor unit 100. Therefore, when the rotor unit 100 rotates under the initial starting force of the motor, the second connection portion 302b of the elastic transmission member 302 rotates with the rotor unit 100. At this time, the elastic energy of the elastic transmission member 302 is not enough to overcome the load of the impeller unit 200. Therefore, the first connection portion 302a of the elastic transmission member 302, the transmission shaft 301 and the impeller unit 200 are stationary. At this stage, as the rotor unit 100 rotates, the elastic transmission member 302 gradually accumulates elastic energy until the elastic energy of the elastic transmission member 302 is sufficient to overcome the load of the impeller unit 200. When the elastic energy of the elastic transmission member 302 is sufficient to overcome the load of the impeller unit 200 , the first connecting portion 302 a of the elastic transmission member, the transmission shaft 301 and the impeller unit 200 begin to rotate.

[0043] As can be seen from the above description, the elastic transmission member 302 provides a flexible transmission effect, so that when the rotor unit 100 begins to rotate, the impeller unit 200 does not rotate with it. Therefore, when the rotor unit 100 first rotates, it does not need to bear the load of the impeller unit 200. Instead, it needs to bear the load of the impeller unit 200 after rotating a certain angle under light or no load. This avoids the problem of a heavy load preventing a smooth startup. In addition, the elastic transmission member 302 acts as a buffer and reduces noise, which reduces startup noise and vibration.

[0044] More specifically, Figure 6 As shown, the second end 301b of the transmission shaft 301 is provided with a first connecting groove A. The first connecting portion 302a of the elastic transmission member 302 is inserted into the first connecting groove A, thereby connecting the transmission shaft 301 and the first connecting portion 302a. When the first connecting portion 302a rotates, it contacts the side walls of the first connecting groove A, allowing the first connecting portion 302a and the transmission shaft 301 to rotate together. This connection facilitates assembly of the transmission shaft 301 and the elastic transmission member 302.

[0045] More specifically, Figure 6 As shown, the first connecting groove portion A can extend axially from the end surface of the clearance-fit end portion of the transmission shaft 301 toward the middle portion of the transmission shaft 301, and a first side notch B for inserting the first connecting portion 302a is formed on the outer circumferential surface of the clearance-fit end portion. This makes it easier to machine the first connecting groove portion A and facilitates assembly of the transmission shaft 301 and the elastic transmission member 302.

[0046] More specifically, Figure 7 As shown, a second connecting groove portion C is provided in the second mounting groove portion 101a. Figure 6 As shown, the elastic transmission member 302 is at least partially located within the second mounting groove 101a, and the second connecting portion 302b of the elastic transmission member 302 is inserted into the second connecting groove C, thereby connecting the second connecting portion 302b to the rotor unit 100. When the second connecting portion 302b rotates, it contacts the side walls of the second connecting groove C, allowing the second connecting portion 302b and the rotor unit 100 to rotate together. This connection method facilitates the assembly of the elastic transmission member 302 and the impeller body 201.

[0047] More specifically, Figure 7 As shown, the second mounting groove portion 101a is provided with a second notch Y1 at one end of the rotor unit 100. A second protrusion Y3 is provided within the second mounting groove portion 101a. The second mounting groove portion 101a has a second circumferential groove wall Y2 disposed around the outer circumference of the transmission shaft 301, and the second protrusion Y3 protrudes from the second circumferential groove wall Y2 into the second mounting groove portion 101a. A second connecting groove portion C is provided in the second protrusion Y3. The second connecting groove portion C forms a second side notch D on the side of the second protrusion Y3 near the transmission shaft 301, through which the second connecting portion 302b passes. The second connecting groove portion C extends axially from the end of the second protrusion Y3 near the second notch Y1 toward the other end of the second protrusion Y3. This makes it easier to machine the second connecting groove portion C and facilitates assembly of the impeller body 201 and the elastic transmission member 302.

[0048] More specifically, Figure 6 As shown, the rotor unit 100 includes a rotor plastic ring 101, a rotor magnetic ring 102, and a rotor end cover 103. The rotor magnetic ring 102 is fixed to the outer circumference of the rotor plastic ring 101. The second mounting groove 101a is provided in the rotor plastic ring 101. The rotor end cover 103 is provided at the second notch Y1 of the second mounting groove 101a. The rotor end cover 103 is provided with a rotor end cover through hole 103a. The second end 301b of the transmission shaft 301 is axially inserted into the inner hole of the rotor plastic ring 101, the inner cavity of the second mounting groove 101a, and the rotor end cover through hole 103a.

[0049] To sum up, the core idea of the present application is that an elastic transmission member 302 is provided between the rotor unit 100 and the transmission shaft 301 or between the transmission shaft 301 and the rotor unit 100, and flexible transmission is achieved by using the elastic transmission member 302, so that when the rotor unit 100 starts to rotate, it does not bear the load of the impeller unit 200, but bears the load of the impeller unit 200 after rotating a certain angle under small load or no load, thereby solving the problem of failure to start smoothly due to heavy load.

[0050] The principles and implementation methods of the present application have been described above using specific examples. The description of the above embodiments is only intended to help understand the method and core concept of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, various improvements and modifications may be made to the present application, and such improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A starting mechanism, characterized in that: The starting mechanism comprises a rotor unit (100), an impeller unit (200) and a transmission unit (300); the rotor unit (100) and the impeller unit (200) are connected in transmission via the transmission unit (300); the impeller unit (200) comprises an impeller body (201); the transmission unit (300) comprises a transmission shaft (301) and an elastic transmission member (302); the elastic transmission member (302) is at least partially sleeved on the outer periphery of the transmission shaft (301); One end of the transmission shaft (301) is fixedly connected to the rotor unit (100), and the other end of the transmission shaft (301) is clearance-fitted with the impeller body (201); The elastic transmission member (302) comprises a first connecting portion (302a) and a second connecting portion (302b), wherein the first connecting portion (302a) is fixedly connected or position-limitingly connected to the transmission shaft (301), and the second connecting portion (302b) is fixedly connected or position-limitingly connected to the first mounting groove portion (201a) of the impeller body (201).

2. The starting mechanism according to claim 1, characterized in that: The elastic transmission member (302) includes a spiral body portion (302c), the spiral body portion (302c) is sleeved on the outer periphery of the transmission shaft (301), the first connecting portion (302a) extends from one end of the spiral body portion (302c) into the enclosed space of the spiral body portion (302c), and the second connecting portion (302b) extends from the other end of the spiral body portion (302c) to the outside of the enclosed space of the spiral body portion (302c).

3. The starting mechanism according to claim 2, characterized in that: One end of the transmission shaft (301) is provided with a first connecting groove (A), and the first connecting portion (302a) is inserted into the first connecting groove (A), thereby achieving connection between the first connecting portion (302a) and the transmission shaft (301).

4. The starting mechanism according to claim 3, characterized in that: The first connecting groove portion (A) extends axially from the end surface of the transmission shaft (301) toward the middle of the transmission shaft (301), and forms a first side notch (B) on the outer peripheral surface of the transmission shaft (301) for inserting the first connecting portion (302a).

5. The starting mechanism according to claim 2, characterized in that: The elastic transmission member (302) is at least partially located in the first installation groove portion (201a), a second connecting groove portion (C) is provided in the first installation groove portion (201a), and the second connecting portion (302b) is inserted into the second connecting groove portion (C), thereby achieving connection between the second connecting portion (302b) and the impeller body (201).

6. The starting mechanism according to claim 5, characterized in that: A first protrusion (X3) is provided in the first installation groove portion (201a), the second connection groove portion (C) is provided on the first protrusion (X3), and a second side notch (D) for inserting the second connection portion (302b) is formed on a side of the first protrusion (X3) close to the transmission shaft (301).

7. The starting mechanism according to any one of claims 1 to 6, characterized in that: The first mounting groove portion (201a) is provided with a first notch (X1) at one end of the impeller body (201), and the other end of the impeller body (201) is provided with a transmission shaft connecting hole (201b); the impeller unit (200) comprises an impeller end cover (202), the impeller end cover (202) is provided at the first notch (X1), the impeller end cover (202) is provided with an impeller end cover through hole (202a), and one end of the transmission shaft (301) is sequentially passed through the impeller end cover through hole (202a), the inner cavity of the first mounting groove portion (201a), and the transmission shaft connecting hole (201b) along the axial direction.

8. A starting mechanism, characterized in that The starting mechanism comprises a rotor unit (100), an impeller unit (200) and a transmission unit (300); the rotor unit (100) and the impeller unit (200) are connected in transmission via the transmission unit (300); the impeller unit (200) comprises an impeller body (201); the transmission unit (300) comprises a transmission shaft (301) and an elastic transmission member (302); the elastic transmission member (302) is at least partially sleeved on the outer periphery of the transmission shaft (301); One end of the transmission shaft (301) is fixedly connected to the impeller body (201), and the other end of the transmission shaft (301) is clearance-fitted with the rotor unit (100); The elastic transmission member (302) comprises a first connecting portion (302a) and a second connecting portion (302b), wherein the first connecting portion (302a) is fixedly connected or position-limitingly connected to the transmission shaft (301), and the second connecting portion (302b) is fixedly connected or position-limitingly connected to the second mounting groove portion (101a) of the rotor unit (100).

9. The starting mechanism according to claim 8, characterized in that: The elastic transmission member (302) is at least partially located in the second installation groove portion (101a), a second connecting groove portion (C) is provided in the second installation groove portion (101a), and the second connecting portion (302b) is inserted into the second connecting groove portion (C), thereby realizing the connection between the second connecting portion (302b) and the impeller body (201), a first protrusion (X3) is provided in the first installation groove portion (201a), the second connecting groove portion (C) is provided on the first protrusion (X3), and a second side notch (D) for inserting the second connecting portion (302b) is formed on a side of the first protrusion (X3) close to the transmission shaft (301).

10. The starting mechanism according to claim 8 or 9, characterized in that: The rotor unit (100) comprises a rotor plastic ring (101), a rotor magnetic ring (102) and a rotor end cover (103); the rotor magnetic ring (102) is fixed on the outer periphery of the rotor plastic ring (101); the second mounting groove portion (101a) is provided on the rotor plastic ring (101); the second mounting groove portion (101a) is provided with a second notch (Y1) at one end of the rotor plastic ring (101); the rotor end cover (103) is covered at the second notch (Y1); the rotor end cover (103) is provided with a rotor end cover through hole (103a); one end of the transmission shaft (301) is sequentially passed through the inner hole of the rotor plastic ring (101), the inner cavity of the second mounting groove portion (101a) and the rotor end cover through hole (103a) along the axial direction.

11. A drainage pump, characterized in that The drainage pump comprises the starting mechanism according to any one of claims 1 to 10.

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