Piston pump mechanism for liquid feeding of washing machine

Abstract

The utility model relates to a piston pump mechanism for washing machine liquid feeding, and belongs to the technical field of intelligent washing machines. The device comprises a piston pump, a motor assembly and a ratchet mechanism, the piston pump comprises a piston and a push rod used for pushing the piston. The motor assembly comprises a motor output shaft, and a motor rotor gear integrally formed with the motor output shaft is arranged on the motor output shaft; the ratchet mechanism is in transmission connection with the motor rotor gear, and an eccentric shaft enabling the push rod to reciprocate is arranged on the ratchet mechanism. Due to the fact that the ratchet mechanism is arranged and is in transmission connection with the motor rotor gear, even if the motor rotor gear rotates in the wrong direction, it can be guaranteed that the eccentric shaft which is arranged on the ratchet mechanism and can enable the push rod to do reciprocating motion cannot drive the push rod to move; and the liquid inlet and the liquid outlet of the piston pump are ensured not to have the undesirable phenomenon of function disorder.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent washing machines, and in particular to a piston pump mechanism for liquid dosing in washing machines. Background Art

[0002] Smart washing machines that automatically dispense detergent are now widely used. After loading clothes, these machines automatically match the optimal amount of detergent based on factors such as the material and weight of the clothes in the washing machine. This prevents undesirable effects such as incomplete washing or residual detergent from insufficient or excessive amounts of detergent, improving the convenience of washing. The most critical element in a smart washing machine's dispenser is the piston pump, which primarily pumps and discharges liquid. Currently, washing machines often have a liquid inlet and outlet. The inlet is used to draw in detergent and other media, while the outlet is used to release detergent and other media. These two ports have relatively fixed functions: the inlet cannot be used to discharge liquid, and the outlet cannot be used to take in liquid. This ensures the stability of the two ports and prevents undesirable situations.

[0003] The functions of the liquid inlet and outlet are mainly achieved by the rotation of the transmission gear driven by the motor gear. The transmission gear is provided with an eccentric shaft, which drives the push rod to reciprocate. The push rod is then combined with a one-way valve to achieve the suction and discharge of the liquid medium by the push rod, so that the liquid inlet and outlet can respectively ensure the stability of the functions. However, the current motor gear rotates in two directions, so there is a possibility that the transmission gear will rotate in both directions. If the motor driving the reciprocating motion of the piston pump rotates incorrectly, the piston pump cannot properly dispense detergent. However, in order to ensure that the functions of the liquid inlet and outlet remain relatively stable and that the piston pump can properly dispense detergent, that is, the liquid inlet cannot be used to discharge liquid and the liquid outlet cannot be used to fill liquid, the transmission gear must be rotated in the set direction to drive the push rod combined with the one-way valve to achieve relatively stable functions of the liquid inlet and outlet. Moreover, the motor gear and the motor output shaft are often set separately, that is, the motor gear is sleeved on the motor output shaft. However, under this setting, due to the increase in frequency of use, the motor gear and the motor output shaft are prone to loosening, causing product quality problems. Summary of the Invention

[0004] An embodiment of the present application provides a piston pump mechanism for dosing liquid in a washing machine, so as to solve the problem in the related art that the piston pump cannot dispense detergent when the motor driving the piston pump to reciprocate rotates incorrectly.

[0005] The embodiment of the present application provides a piston pump mechanism for liquid dosing in a washing machine, comprising:

[0006] A piston pump comprising a piston and a push rod for pushing the piston;

[0007] A motor assembly, the motor assembly comprising a motor output shaft, the motor output shaft being provided with a motor rotor gear integrally formed therewith;

[0008] A ratchet mechanism is transmission-connected to the motor rotor gear, and an eccentric shaft is provided on the ratchet mechanism to enable the push rod to reciprocate.

[0009] In some embodiments, the ratchet mechanism includes a transmission gear that is transmission-connected to the motor rotor gear, and a cam that is rotationally connected to the transmission gear, and the inner circle of the transmission gear is provided with a tooth-shaped groove along the circumference, and the cam is provided with a pawl that matches the tooth-shaped groove.

[0010] In some embodiments, a plurality of pawls are provided along the circumferential direction of the cam, and the pawls are provided in an arc shape.

[0011] In some embodiments, two ratchet mechanisms are provided, and both ratchet mechanisms are transmission-connected to the motor rotor gear.

[0012] In some embodiments, the motor rotor gear transmission is connected to a reduction gear assembly, which includes a first reduction gear engaged with the motor rotor gear and a second reduction gear engaged with the first reduction gear, and the second reduction gear is engaged with the two ratchet mechanisms.

[0013] In some embodiments, the second reduction gear includes a first tooth segment engaged with the first reduction gear and a second tooth segment arranged at the top of the first tooth segment and engaged with the ratchet mechanism, and a connecting segment is provided between the first tooth segment and the second tooth segment.

[0014] In some embodiments, a rotating shaft is provided in the second reduction gear, and the rotating shaft is integrally formed with the second reduction gear.

[0015] In some embodiments, the connecting segment is a cylindrical structure, and the diameter of the connecting segment is not less than the diameter of the second tooth segment.

[0016] In some embodiments, a base for placing the transmission gear is provided at the bottom of the ratchet mechanism, the second tooth segment is exposed on the top surface of the base, and an opening matching the second tooth segment is provided on the base.

[0017] In some embodiments, the eccentric shaft is fixed to the top surface of the cam, and a through hole matching the eccentric shaft is provided on the push rod.

[0018] The beneficial effects of the technical solution provided by this application include:

[0019] An embodiment of the present application provides a piston pump mechanism for dosing liquid in a washing machine, comprising a piston pump, a motor assembly, and a ratchet mechanism; the piston pump comprises a piston and a push rod for pushing the piston; the motor assembly comprises a motor output shaft, on which is provided a motor rotor gear integrally formed therewith; the ratchet mechanism is transmission-connected to the motor rotor gear, and the ratchet mechanism is provided with an eccentric shaft for causing the push rod to reciprocate.

[0020] When the motor is in a state of rotation and the motor is stopped, the push rod is rotated in a direction opposite to the rotation of the gear, and the push rod is rotated in a direction opposite to the rotation of the gear, so that the pump can be turned off and on. In addition, the motor output shaft is provided with a motor rotor gear integrally formed therewith. This method of integrally forming the motor output shaft and the motor rotor gear replaces the arrangement of sleeve-arranging the motor rotor gear on the motor output shaft, which can ensure the stability of the structure, that is, ensure the reliability of the use of the motor output shaft and the motor rotor gear, and avoid the occurrence of broken teeth or other adverse phenomena. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 A schematic diagram of a ratchet mechanism provided in an embodiment of the present application;

[0023] Figure 2 It is a structural diagram of the motor assembly and the reduction gear assembly;

[0024] Figure 3 It is a structural diagram of the eccentric shaft and the push rod;

[0025] Figure 4 Schematic diagram of the overall external structure of the piston pump mechanism.

[0026] Reference numerals:

[0027] 1. Motor assembly; 2. Ratchet mechanism; 3. Piston pump; 4. Eccentric shaft; 5. Reduction gear assembly; 6. Base; 51. First reduction gear; 52. Second reduction gear; 11. Motor output shaft; 12. Motor rotor gear; 21. Transmission gear; 22. Cam; 31. Push rod; 100. Liquid inlet; 101. Liquid outlet; 211. Toothed groove; 221. Ratchet pawl; 311. Through hole; 521. First tooth segment; 522. Second tooth segment; 523. Connecting segment; 524. Rotating shaft. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] An embodiment of the present application provides a piston pump mechanism for dosing liquid in a washing machine, which can solve the problem in the related art that the piston pump cannot dispense detergent when the motor driving the piston pump to reciprocate rotates incorrectly.

[0030] See also Figures 1 to 4 As shown, an embodiment of the present application provides a piston pump 3 mechanism for dosing liquid in a washing machine, comprising a piston pump 3, a motor assembly 1 and a ratchet mechanism 2; the piston pump 3 comprises a piston and a push rod 31 for pushing the piston; the motor assembly 1 comprises a motor output shaft 11, on which a motor rotor gear 12 integrally formed therewith is provided; the ratchet mechanism 2 is transmission-connected to the motor rotor gear 12, and the ratchet mechanism 2 is provided with an eccentric shaft 4 for causing the push rod 31 to reciprocate.

[0031] In actual use, the piston pump 3 includes a piston and a push rod 31 for pushing the piston. The reciprocating motion of the push rod 31 pushing out and retreating can drive the liquid inlet 100 and the liquid outlet 101 to perform liquid inlet and liquid outlet work. When the motor rotor gear 12 of the motor output shaft 11 rotates in one direction, the normal functions of the liquid inlet 100 and the liquid outlet 101 can be achieved, that is, the push rod 31 is driven to push out and retreat normally, so that the liquid inlet 100 guarantees the liquid inlet function and the liquid outlet 101 guarantees the liquid outlet function. However, when the motor rotates incorrectly, the motor rotor gear 12 2 rotates in the opposite direction, transmitting the rotation to the push rod 31, causing the push rod 31 to move incorrectly, resulting in the piston pump 3 being unable to dispense detergent. However, due to the provision of the ratchet mechanism 2, which is transmission-connected to the motor rotor gear 12, even if the motor rotor gear 12 rotates in the wrong direction, the eccentric shaft 4 provided on the ratchet mechanism 2, which enables the push rod 31 to reciprocate, will not cause the push rod 31 to move, thereby ensuring that the liquid inlet 100 and the liquid outlet 101 of the piston pump 3 will not malfunction. In addition, the motor output shaft 11 is provided with a motor rotor gear 12 integrally formed therewith. This integral formation of the motor output shaft 11 and the motor rotor gear 12 replaces the arrangement of the motor rotor gear 12 being sleeved on the motor output shaft 11, ensuring the structural stability, that is, ensuring the reliability of the motor output shaft 11 and the motor rotor gear 12, and avoiding the occurrence of broken teeth or other adverse phenomena.

[0032] In some optional embodiments, such as Figures 1 to 3 As shown, the ratchet mechanism 2 includes a transmission gear 21 that is transmission-connected to the motor rotor gear 12, and a cam 22 that is rotationally connected to the transmission gear 21. The transmission gear 21 has a tooth-shaped groove 211 formed along its inner circumference, and the cam 22 is provided with a pawl 221 that matches the tooth-shaped groove 211. In actual use, the ratchet mechanism 2 includes a transmission gear 21 that is transmission-connected to the motor rotor gear 12, the cam 22 is rotationally connected to the transmission gear 21, and the transmission gear 21 has a tooth-shaped groove 211 formed along its inner circumference, and the cam 22 is provided with a pawl 221 that matches the tooth-shaped groove 211.

[0033] In actual use, such as Figure 2 and Figure 3As shown, the eccentric shaft 4 is mounted on the cam 22. When the motor rotates correctly, it drives the motor rotor gear 12 to rotate in the correct direction, and the transmission gear 21 can also rotate in the correct direction. The pawl 221 of the cam 22 and the toothed groove 211 formed along the inner circumference of the transmission gear 21 do not move relative to each other, but rotate in the same direction, ensuring the normal operation of the entire mechanism, thereby ensuring the correct movement of the push rod 31 and the normal function of the liquid inlet 100 and the liquid outlet 101 of the piston pump 3. When the motor rotates incorrectly, it drives the motor rotor gear 12 to rotate in the wrong direction, and the transmission gear 21 also rotates in the wrong direction. The pawl 221 of the cam 22 and the toothed groove 211 opened along the circumference of the inner circle of the transmission gear 21 produce relative motion. The pawl 221 abuts the toothed groove 211, making it impossible for the cam 22 to rotate, and the eccentric shaft 4 on the cam 22 cannot push the push rod 31 to move, thereby avoiding the incorrect movement of the push rod 31, thereby ensuring that the liquid inlet 100 and the liquid outlet 101 of the piston pump 3 will not have any functional disorder.

[0034] In some optional embodiments, such as Figure 1 As shown, multiple pawls 221 are provided along the circumference of the cam 22, and the pawls 221 are arranged in an arc shape. The arc shape of the pawls 221 ensures that when the transmission gear 21 rotates in the wrong direction, the pawls 221 of the cam 22 and the tooth-shaped grooves 211 provided along the circumference of the inner circle of the transmission gear 21 will produce relative movement. When the pawls 221 abut the tooth-shaped grooves 211, the effective transmission of the force can be ensured without breaking, thereby improving the service life of the pawls 221. In addition, three pawls 221 can be provided at intervals along the circumference to ensure the reliability and durability of the pawls 221.

[0035] In some optional embodiments, two ratchet mechanisms 2 are provided, and both ratchet mechanisms 2 are transmission-connected to the motor rotor gear 12. Specifically, the motor rotor gear 12 is transmission-connected to a reduction gear assembly 5, which includes a first reduction gear 51 meshed with the motor rotor gear 12 and a second reduction gear 52 meshed with the first reduction gear 51, and the second reduction gear 52 meshed with the two ratchet mechanisms 2.

[0036] like Figures 1 to 4As shown, the setting of the second reduction gear 52 of the first reduction gear 51 can reduce the rotation speed through this transmission structure, thereby ensuring that the rotation speed of the cam 22 remains in a reasonable range, and the second reduction gear 52 is simultaneously engaged with the two ratchet mechanisms 2, which can enable two push rods 31 to move simultaneously, maintaining the synchronous operation of the two groups of liquid inlets 100 and liquid outlets 101, so that one motor rotor gear 12 can simultaneously drive the two groups of liquid inlets 100 and liquid outlets 101 to work, thereby avoiding cost increases while being able to put two different media into the washing machine at the same time, such as laundry detergent and softener at the same time.

[0037] In some optional embodiments, the second reduction gear 52 includes a first tooth segment 521 that meshes with the first reduction gear 51, and a second tooth segment 522 disposed on top of the first tooth segment 521 and meshing with the ratchet mechanism 2. A connecting segment 523 is disposed between the first tooth segment 521 and the second tooth segment 522. In actual use, the connecting segment 523 is cylindrical, with a diameter no smaller than that of the second tooth segment 522. The provision of the connecting segment 523 enables the second tooth segment 522 and the first tooth segment 521 to form a stable whole. This configuration replaces the use of an output shaft to connect the second tooth segment 522 and the first tooth segment 521, thereby enhancing structural stability and increasing the service life of the structure.

[0038] In some optional embodiments, such as Figure 2 As shown, a rotating shaft 524 is provided in the second reduction gear 52, and the rotating shaft 524 and the second reduction gear 52 are integrally formed. The setting of the rotating shaft 524 and the second reduction gear 52 being integrally formed can enhance the structural stability, improve the service life of the structure, and avoid the occurrence of adverse phenomena such as broken teeth or broken shafts.

[0039] In some optional embodiments, such as Figure 1 As shown, the ratchet mechanism 2 has a base 6 at the bottom for placing the transmission gear 21. The second tooth segment 522 is exposed on the top surface of the base 6. The base 6 has an opening that matches the second tooth segment 522. In some embodiments, the eccentric shaft 4 is fixed to the top surface of the cam 22, and the push rod 31 is provided with a through hole 311 that matches the eccentric shaft 4.

[0040] In the description of this application, it should be noted that the terms "upper" and "lower" 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 this application 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 cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0042] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A piston pump mechanism for dosing liquid in a washing machine, characterized in that: include: A piston pump (3), the piston pump (3) comprising a piston and a push rod (31) for pushing the piston; A motor assembly (1), the motor assembly (1) comprising a motor output shaft (11), the motor output shaft (11) being provided with a motor rotor gear (12) integrally formed therewith; A ratchet mechanism (2) is transmission-connected to the motor rotor gear (12), and an eccentric shaft (4) is provided on the ratchet mechanism (2) for causing the push rod (31) to reciprocate.

2. A piston pump mechanism for washing machine liquid dosing according to claim 1, characterized in that: The ratchet mechanism (2) comprises a transmission gear (21) transmission-connected to the motor rotor gear (12), and a cam (22) rotatably connected to the transmission gear (21), wherein the inner circle of the transmission gear (21) is provided with a tooth-shaped groove (211) along the circumference, and the cam (22) is provided with a ratchet pawl (221) matching the tooth-shaped groove (211).

3. A piston pump mechanism for washing machine liquid dosing according to claim 2, characterized in that: A plurality of the ratchet pawls (221) are arranged along the circumferential direction of the cam (22), and the ratchet pawls (221) are arranged in an arc shape.

4. A piston pump mechanism for washing machine liquid dosing according to claim 2, characterized in that: Two ratchet mechanisms (2) are provided, and both ratchet mechanisms (2) are transmission-connected to the motor rotor gear (12).

5. A piston pump mechanism for washing machine liquid dosing according to claim 4, characterized in that: The motor rotor gear (12) is transmission-connected to a reduction gear assembly (5), the reduction gear assembly (5) comprising a first reduction gear (51) meshed with the motor rotor gear (12) and a second reduction gear (52) meshed with the first reduction gear (51), the second reduction gear (52) meshed with the two ratchet mechanisms (2).

6. A piston pump mechanism for liquid dosing in a washing machine according to claim 5, characterized in that: The second reduction gear (52) comprises a first tooth segment (521) meshed with the first reduction gear (51) and a second tooth segment (522) arranged at the top of the first tooth segment (521) and meshed with the ratchet mechanism (2); a connecting segment (523) is provided between the first tooth segment (521) and the second tooth segment (522).

7. The piston pump mechanism for washing machine liquid dosing according to claim 5, characterized in that: A rotating shaft (524) is provided in the second reduction gear (52), and the rotating shaft (524) and the second reduction gear (52) are integrally formed.

8. The piston pump mechanism for washing machine liquid dosing according to claim 6, characterized in that: The connecting section (523) is a cylindrical structure, and the diameter of the connecting section (523) is not less than the diameter of the second tooth section (522).

9. The piston pump mechanism for washing machine liquid dosing according to claim 6, characterized in that: A base (6) for placing the transmission gear (21) is provided at the bottom of the ratchet mechanism (2); the second tooth segment (522) is exposed on the top surface of the base (6); and an opening matching the second tooth segment (522) is provided on the base (6).

10. The piston pump mechanism for liquid dosing in a washing machine according to claim 2, characterized in that: The eccentric shaft (4) is fixed to the top surface of the cam (22), and a through hole (311) matching the eccentric shaft (4) is provided on the push rod (31).

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