Detergent putting mechanism and washing machine

Abstract

The utility model discloses a detergent putting mechanism and a washing machine, comprising a first piston cylinder comprising a first piston and a first cylinder body, one end of the first cylinder body is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet is provided with a first one-way valve pointing to the first cylinder body and opened unidirectionally; the first liquid outlet is provided with a first one-way outlet valve which points to the outside of the first cylinder body and is opened in a one-way mode, the first liquid inlet is connected with a liquid inlet pipe used for being communicated with a detergent box, and the first liquid outlet is connected with an adapter pipe; the second piston cylinder comprises a second piston and a second cylinder body, one end of the second cylinder body is provided with a second liquid inlet and a second liquid outlet, the second liquid inlet is provided with a second one-way inlet valve which points to the interior of the second cylinder body and is opened unidirectionally, the second liquid outlet is provided with a second one-way outlet valve which points to the exterior of the second cylinder body and is opened unidirectionally, and the second liquid inlet is connected with an adapter; the second liquid outlet is connected with a liquid outlet pipe used for being communicated with the washing drum. Based on the scheme, the amount of the detergent put into the washing drum can be accurately controlled.

Description

Technical Field

[0001] The present application relates to the technical field of washing machines, and particularly relates to a detergent dispensing mechanism and a washing machine. Background Art

[0002] Some existing fully automatic washing machines have the function of automatically dispensing detergent. The specific implementation method is as follows: A detergent box, a peristaltic pump and other structures are arranged in the washing machine. The detergent box and the peristaltic pump are connected by a pipeline. The peristaltic pump is connected to the washing tub or the dispensing pipeline by a pipeline. Users can store the detergent in the detergent box in advance. When starting the washing machine, the washing machine can automatically start the peristaltic pump, and use the peristaltic pump to push the detergent into the washing tub through the pipeline. Therefore, the amount of detergent dispensed by the existing washing machine can only be controlled according to the operation time of the peristaltic pump. However, within the same dispensing time, different degrees of filling of the detergent in the pipeline will result in different actual dispensing amounts. Therefore, there is a defect of poor dispensing accuracy. Summary of the Utility Model

[0003] The purpose of the embodiments of the present utility model is to provide a detergent dispensing mechanism and a washing machine, which can solve the above problems existing in the prior art.

[0004] To achieve the above object, the present application adopts the following technical solutions:

[0005] On the one hand, a detergent dispensing mechanism is provided, including:

[0006] A first piston cylinder, including a first piston and a first cylinder body. One end of the first cylinder body is provided with a first liquid inlet and a first liquid outlet. The first liquid inlet is provided with a first one-way inlet valve that opens unidirectionally into the first cylinder body. The first liquid outlet is provided with a first one-way outlet valve that opens unidirectionally out of the first cylinder body. The first liquid inlet is connected to a liquid inlet pipe for communicating with the detergent box, and the first liquid outlet is connected to an adapter pipe;

[0007] A first driving component for driving the first piston to expand and contract;

[0008] A second piston cylinder, including a second piston and a second cylinder body. One end of the second cylinder body is provided with a second liquid inlet and a second liquid outlet. The second liquid inlet is provided with a second one-way inlet valve that opens unidirectionally into the second cylinder body. The second liquid outlet is provided with a second one-way outlet valve that opens unidirectionally out of the second cylinder body. The second liquid inlet is connected to the adapter pipe, and the second liquid outlet is connected to a liquid outlet pipe for communicating with the washing tub;

[0009] A second driving component for driving the second piston to expand and contract.

[0010] Optionally, the second piston includes a second piston head and a second piston rod connected thereto, and the second piston rod has an external thread; the second driving assembly includes a threaded sleeve and a second motor, the threaded sleeve is sleeved on the second piston rod, and the second motor is in transmission connection with the threaded sleeve. By driving the threaded sleeve to rotate by the second motor, the telescopic movement of the second piston is realized.

[0011] Optionally, a driven gear is provided on the outer periphery of the threaded sleeve, the second motor is connected with a driving gear, and the driving gear meshes with the driven gear to realize the transmission connection between the second motor and the threaded sleeve.

[0012] Optionally, a rotating support is fixedly installed at one end of the second cylinder body away from the second liquid inlet, and the threaded sleeve is rotatably installed on the rotating support.

[0013] Optionally, the rotating support includes an upper support shell and a lower support shell. Support bearings are respectively provided on the upper support shell and the lower support shell. Both ends of the threaded sleeve are respectively connected to the support bearings to realize the rotational installation of the threaded sleeve; the upper support shell covers the lower support shell, and an interface is provided on one side of the upper support shell and / or the lower support shell. The driving gear extends into the rotating support through the interface to mesh with the driven gear.

[0014] Optionally, the second cylinder body includes a cylinder barrel and an expansion head installed at one end of the cylinder barrel. The diameter dimension of the expansion head is larger than the diameter dimension of the cylinder barrel, and both the second liquid inlet and the second liquid outlet are provided on the expansion head.

[0015] Optionally, the expansion head has a threaded connection nozzle, and the threaded connection nozzle is threadedly connected to the cylinder barrel.

[0016] Optionally, the inner diameter dimension of the first cylinder body is more than twice the inner diameter dimension of the second cylinder body, and the telescopic stroke of the first piston is less than half of the telescopic stroke of the second piston.

[0017] Optionally, the first piston includes a first piston head and a first piston rod connected thereto. A connection head is provided at one end of the first piston rod away from the first piston head, and a connection long hole is provided on the connection head; the first driving assembly includes a first motor and a runner. The runner is connected to the output shaft of the first motor, and a connection column eccentric to the first motor is provided on the runner. The connection column is inserted into the long hole. By driving the runner to rotate by the first motor, the telescopic movement of the first piston is realized.

[0018] On the other hand, a washing machine is provided, including the above-mentioned detergent dispensing mechanism.

[0019] The beneficial effects of the present application are as follows: The present utility model provides a detergent dispensing mechanism and a washing machine, including a second piston cylinder driven to expand and contract by a second driving component. The second piston cylinder is connected to the washing tub through a liquid outlet pipe, and the pumping of laundry detergent into the washing tub is achieved by the suction and pushing actions of the second piston cylinder. In this solution, by simply controlling the number of pushes and the pushing distance of the piston rod of the second piston cylinder, the amount of detergent dispensed into the washing tub can be accurately controlled.

[0020] Importantly, in order to further improve the accuracy of the dispensing amount and avoid the problem of inaccurate dispensing amount caused by the formation of a vacuum in the second piston cylinder, this solution also provides a first piston cylinder driven to expand and contract by a first driving component. The first piston cylinder is connected between the detergent box and the second piston cylinder. During the suction process of the second piston cylinder, the detergent can be pumped into the second piston cylinder by pressurizing with the first piston rod, so that the second piston cylinder remains full, ensuring that the second piston can push out the same amount of detergent when moving the same distance, thereby achieving the effect of ensuring high dispensing amount accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application will be further described in detail below with reference to the drawings and embodiments.

[0022] Figure 1 is a schematic structural diagram of the detergent dispensing mechanism according to the embodiment of the present application;

[0023] Figure 2 is a schematic structural diagram of the connection between the first piston cylinder and the first driving component according to the embodiment of the present application;

[0024] Figure 3 is Figure 2 an exploded schematic diagram of the structure shown;

[0025] Figure 4 is a schematic structural diagram of the connection between the second piston cylinder and the second driving component according to the embodiment of the present application;

[0026] Figure 5 is Figure 4 an exploded schematic diagram of the structure shown;

[0027] Figure 6 is a schematic structural diagram of the second driving component according to the embodiment of the present application;

[0028] Figure 7 is Figure 6 an exploded schematic diagram of the structure shown.

[0029] In the figure:

[0030] 1. First piston cylinder; 11. First cylinder block; 111. First liquid inlet; 112. First liquid outlet; 12. First piston; 121. First piston head; 122. First piston rod; 123. Connector; 124. Connecting long hole; 2. First driving assembly; 21. First motor; 22. Runner; 23. Connecting column; 3. Second piston cylinder; 31. Second cylinder block; 311. Second liquid inlet; 312. Second liquid outlet; 313. Cylinder barrel; 314. Expansion head; 32. Second piston; 321. Second piston head; 322. Second piston rod; 4. Second driving assembly; 41. Second motor; 42. Driving gear; 43. Threaded sleeve; 44. Driven gear; 45. Rotating support; 451. Upper shell of the support; 452. Lower shell of the support; 453. Docking port; 454. Support bearing; 5. Liquid inlet pipe; 6. Adapter pipe; 7. Liquid outlet pipe. Detailed implementation manners

[0031] To make the technical problems solved by this application, the technical solutions adopted, and the achieved technical effects clearer, the technical solutions of the embodiments of this application will be further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of this application.

[0032] In the description of this application, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific situations.

[0033] In this application, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0034] Some existing semi-automatic washing machines have the function of automatically dispensing detergent. The specific implementation method is as follows: Structures such as a detergent box and a peristaltic pump are arranged in the washing machine. The detergent box and the peristaltic pump are connected by a pipeline. The peristaltic pump is connected to the washing tub or the dispensing pipeline by a pipeline. Users can pre-store the detergent in the detergent box. When starting the washing machine, the washing machine can automatically start the peristaltic pump and use the peristaltic pump to push the detergent into the washing tub through the pipeline. Therefore, the amount of detergent dispensed by the existing washing machine can only be controlled according to the operation time of the peristaltic pump. However, within the same dispensing time, different degrees of filling of the detergent in the pipeline will result in different actual dispensing amounts. Therefore, there is a defect of poor dispensing accuracy.

[0035] As Figures 1-7 shown, in order to overcome the above technical problems, this embodiment provides a detergent dispensing mechanism, which includes a first piston cylinder 1, a first driving component 2, a second piston cylinder 3, and a second driving component 4. Among them, the first piston cylinder 1 includes a first piston 12 and a first cylinder body 11. One end of the first cylinder body 11 is provided with a first liquid inlet 111 and a first liquid outlet 112. The first liquid inlet 111 is provided with a first inlet check valve that opens unidirectionally into the first cylinder body 11. The first liquid outlet 112 is provided with a first outlet check valve that opens unidirectionally out of the first cylinder body 11. The first liquid inlet 111 is connected to a liquid inlet pipe 5 for communicating with the detergent box. The first liquid outlet 112 is connected to a transfer pipe 6. The first driving component 2 is used to drive the first piston 12 to expand and contract. The second piston cylinder 3 includes a second piston 32 and a second cylinder body 31. One end of the second cylinder body 31 is provided with a second liquid inlet 311 and a second liquid outlet 312. The second liquid inlet 311 is provided with a second inlet check valve that opens unidirectionally into the second cylinder body 31. The second liquid outlet 312 is provided with a second outlet check valve that opens unidirectionally out of the second cylinder body 31. The second liquid inlet 311 is connected to the transfer pipe 6. The second liquid outlet 312 is connected to a liquid outlet pipe 7 for communicating with the washing tub. The second driving component 4 is used to drive the second piston 32 to expand and contract.

[0036] When driven by the first driving component 2 to drive the first piston 12 to suck, the first inlet check valve opens and the first outlet check valve closes. At this time, the detergent in the detergent box can be sucked into the first cylinder body 11 through the liquid inlet pipe 5. When driving the first piston 12 to pump out, the first inlet check valve closes and the first outlet check valve opens. At this time, the detergent in the first cylinder body 11 can be pumped into the second cylinder body 31 through the transfer pipe 6.

[0037] Similarly, when the second piston 32 is driven by the second driving component 4 to suck, the second inlet check valve opens and the second outlet check valve closes. At this time, the detergent in the first cylinder body 11 can be sucked into the second cylinder body 31 through the adapter pipe 6. When driving the second piston 32 to pump out, the second inlet check valve closes and the second outlet check valve opens. At this time, the detergent in the second cylinder body 31 can be pumped into the washing tub through the liquid outlet pipe 7.

[0038] In this solution, the second piston cylinder 3 is connected to the washing tub through the liquid outlet pipe 7, and the pumping of the washing liquid into the washing tub is realized by the sucking and pushing actions of the second piston cylinder 3. Therefore, by only controlling the pushing times and the pushing distance of the second piston 32 of the second piston cylinder 3, the amount of detergent delivered to the washing tub can be accurately controlled.

[0039] In theory, only by setting the second piston cylinder 3 and the second driving component 4, the purpose of pumping the detergent in the detergent box into the washing tub can be achieved. However, the inventor found that since the opening of the second inlet check valve requires a certain pressure, and when the detergent supply speed is insufficient and the sucking speed of the second piston 32 is relatively fast, the detergent cannot be replenished into the second cylinder body 31 in time, which will cause the second cylinder body 31 to be insufficiently filled and there will be a certain degree of vacuum. When the second piston 32 pumps out the detergent, due to the existence of this vacuum, the first small section of displacement of the second piston 32 cannot pump out the detergent, resulting in the problem of insufficient actual pumping volume.

[0040] To further overcome the above technical problems, a first piston cylinder 1 is also provided between the second piston cylinder 3 and the detergent box in this solution. During operation, the second piston 32 first performs a sucking operation. At this time, the detergent in the detergent box will be sucked into the second cylinder body 31 after passing through the first cylinder body 11. After the second piston 32 completes the sucking, the second piston 32 then performs a pumping operation, and continues to apply pressure to pump a small amount of detergent in the second cylinder body 31 into the second cylinder body 31 to make the second cylinder body 31 fully filled, and then the second piston 32 performs a pumping operation again. To avoid bursting of the pipeline due to excessive pressure, a pressure sensor can be provided in the first cylinder body 11. The pressure sensor can feedback the pressures in the first cylinder body 11 and the second cylinder body 31 to the system. During the process of continuously applying pressure by the first piston rod 122 during operation, when it is detected that the pressure reaches the set value, the first piston rod 122 is controlled to stop pushing further.

[0041] In summary, the solution of this embodiment further improves the accuracy of the dispensing amount, avoiding the problem of inaccurate dispensing amount caused by the appearance of a vacuum in the second piston cylinder 3. Specifically, this solution also provides a first piston cylinder 1 driven by a first driving component 2 to expand and contract. The first piston cylinder 1 is connected between the detergent box and the second piston cylinder 3. During the suction process of the second piston cylinder 3, the detergent can be pumped into the second piston cylinder 3 by pressurizing with the first piston rod 122, so that the second piston cylinder 3 remains full, ensuring that the second piston 32 can push out the same amount of detergent when moving the same distance, thereby achieving the effect of ensuring high dispensing amount accuracy.

[0042] In one embodiment, referring to Figures 4-5 , the second piston 32 includes a connected second piston head 321 and a second piston rod 322. The second piston rod 322 has an external thread; the second driving component 4 includes a threaded sleeve 43 and a second motor 41. The threaded sleeve 43 is sleeved on the second piston rod 322, and the second motor 41 is in transmission connection with the threaded sleeve 43. By driving the threaded sleeve 43 to rotate with the second motor 41, the second piston 32 is driven to expand and contract.

[0043] Due to the self-locking and high-precision characteristics of screw drive, by accurately controlling the rotation angle and speed of the second motor 41, the telescopic distance of the second piston rod 322 can be very accurately controlled, thereby realizing high-precision control of the detergent dispensing amount. This control method is more accurate and reliable than the traditional method of directly pushing or pulling the piston. In addition, when screw drive transmits power, it can maintain good stability and is not prone to sliding or jumping phenomena, which helps to maintain a stable flow rate and pressure during the detergent dispensing process, avoiding fluctuations in the dispensing amount caused by system instability.

[0044] As can be seen from the above, since the cross-sectional area of the cavity of the second cylinder body 31 is fixed, when the system calculates the quantitative dispensing of detergent, only by controlling the rotation angle of the second motor 41, the moving distance of the second piston rod 322 can be accurately controlled, and the accurate control of the dispensing amount can be realized. To achieve accurate control, the second motor 41 uses a servo motor.

[0045] In one embodiment, referring to Figure 6 , a driven gear 44 is provided on the outer periphery of the threaded sleeve 43, and the second motor 41 is connected with a driving gear 42. The driving gear 42 meshes with the driven gear 44 to realize the transmission connection between the second motor 41 and the threaded sleeve 43.

[0046] Gear transmission is an efficient and reliable transmission method. It can effectively transmit the rotational power of the motor to the threaded sleeve 43, and then drive the telescoping of the second piston 32. Due to the stable transmission ratio and high transmission efficiency of gear transmission, the detergent dispensing mechanism can ensure stable performance and high precision during operation.

[0047] In one embodiment, referring to Figure 6 , at one end of the second cylinder block 31 away from the second liquid inlet 311, a rotating support 45 is fixedly installed, and the threaded sleeve 43 is rotatably installed on the rotating support 45.

[0048] The rotating support 45 provides a stable support point for the threaded sleeve 43, enabling the threaded sleeve 43 to remain stable during rotation and not prone to shaking or deviation. This helps ensure the stability and reliability of the second piston 32 during telescoping, thereby improving the precision of detergent dispensing.

[0049] In one embodiment, referring to Figure 7 , the rotating support 45 includes an upper support shell 451 and a lower support shell 452. Support bearings 454 are respectively provided on the upper support shell 451 and the lower support shell 452. Both ends of the threaded sleeve 43 are respectively connected to the support bearings 454 to achieve the rotational installation of the threaded sleeve 43. The upper support shell 451 covers the lower support shell 452, and an interface 453 is provided on one side of the upper support shell 451 and / or the lower support shell 452. The driving gear 42 extends into the rotating support 45 through the interface 453 to mesh with the driven gear 44.

[0050] By dividing the rotating support 45 into the upper support shell 451 and the lower support shell 452 and respectively arranging support bearings 454 in both to support the threaded sleeve 43, the forces and torques generated during the rotation of the threaded sleeve 43 can be effectively dispersed, thereby enhancing the structural strength and stability of the entire rotating support 45. This design helps prevent vibration and deviation caused by the rotation of the threaded sleeve 43, improving the precision and reliability of detergent dispensing. The assembled design of the upper support shell 451 and the lower support shell 452 makes the assembly of the rotating support 45 more convenient. At the same time, when it is necessary to maintain or replace the support bearing 454 or the threaded sleeve 43, only the upper support shell 451 needs to be simply disassembled for operation, reducing the maintenance difficulty and cost. In addition, the design of the interface 453 also facilitates the meshing adjustment of the driving gear 42 and the driven gear 44, improving the flexibility and efficiency of assembly.

[0051] In one embodiment, the second cylinder block 31 includes a cylinder barrel 313 and an expansion head 314 installed at one end of the cylinder barrel 313. The diameter of the expansion head 314 is larger than that of the cylinder barrel 313. The second liquid inlet 311 and the second liquid outlet 312 are both arranged on the expansion head 314.

[0052] Specifically, in order to improve the dispensing accuracy, the second cylinder block 31 is preferably set as a slender structure, so that the movement distance of the second piston rod 322 can be more accurately reflected as the dispensing amount. When the second cylinder block 31 is set as a slender structure, it is difficult to arrange the second liquid inlet 311 and the second liquid outlet 312 at its end at the same time. Therefore, in this solution, the second cylinder block 31 is set as a structure combined with a cylinder barrel 313 and an expansion head 314. The cylinder barrel 313 is set as a slender cylindrical shape, and the second piston rod 322 moves inside the cylinder barrel 313; the expansion head 314 can be enlarged in size to facilitate the arrangement of the second liquid inlet 311 and the second liquid outlet 312.

[0053] In one embodiment, the expansion head 314 has a threaded connection nozzle, and the threaded connection nozzle is threadedly connected to the cylinder barrel 313.

[0054] Connecting the expansion head 314 and the cylinder barrel 313 through the threaded connection nozzle can significantly enhance the connection strength between the two, ensuring that there is no loosening or detachment during the detergent dispensing process. Preferably, a sealing ring is arranged between the cylinder barrel 313 and the expansion head 314 to prevent detergent leakage.

[0055] In one embodiment, the inner diameter of the first cylinder block 11 is more than twice the inner diameter of the second cylinder block 31, and the telescopic stroke of the first piston 12 is less than half of the telescopic stroke of the second piston 32.

[0056] The movement distance of the second piston 32 in the second cylinder block 31 actually determines the detergent dispensing amount. Therefore, it is preferably set as a slender structure. The function of the first piston cylinder 1 is only to refill the detergent into the second cylinder block 31 repeatedly. The accuracy requirement for the movement distance of the first piston 12 is not high. Therefore, it is set as a short and thick structure, which can shorten the movement stroke of the first piston 12 and facilitate the arrangement of the first piston 12 and the first driving component 2.

[0057] In one embodiment, the first piston 12 includes a connected first piston head 121 and a first piston rod 122. One end of the first piston rod 122 away from the first piston head 121 is provided with a connection head 123, and the connection head 123 is provided with a connection long hole 124. The first driving assembly 2 includes a first motor 21 and a runner 22. The runner 22 is connected to the output shaft of the first motor 21. The runner 22 is provided with a connection post 23 eccentric to the first motor 21. The connection post 23 is inserted into the long hole. By driving the runner 22 to rotate by the first motor 21, the first piston 12 is driven to expand and contract.

[0058] Since the connection post 23 is eccentric to the first motor 21, when the first motor 21 drives the runner 22 to rotate, the connection post 23 will reciprocate in the connection long hole 124, thereby driving the first piston rod 122 to expand and contract. In this solution, the accuracy requirement for controlling the moving distance of the first piston rod 122 is not high. Therefore, the first driving assembly 2 is set as a structure combined with the first motor 21 and the runner 22, which not only meets the driving requirements but also has the advantages of simple structure and low cost.

[0059] On the other hand, a washing machine is provided, including the above-mentioned detergent dispensing mechanism.

[0060] Similarly, based on the detergent dispensing mechanism of this embodiment, the washing machine of this embodiment can realize the function of automatically dispensing detergent with high precision.

[0061] In the description of this article, it should be understood that the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are only for the convenience of description and simplifying the operation, rather than indicating or implying 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 to this application. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment" and "example" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0063] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0064] The technical principles of the present application have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and should not be construed in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art can readily conceive of other specific embodiments of the present application without creative efforts, and these embodiments will fall within the scope of protection of the present application.

Claims

1. A detergent dispensing mechanism, characterized in that: include: A first piston cylinder (1) comprises a first piston (12) and a first cylinder body (11); one end of the first cylinder body (11) is provided with a first liquid inlet (111) and a first liquid outlet (112); the first liquid inlet (111) is provided with a first inlet check valve which is opened in one direction toward the inside of the first cylinder body (11); the first liquid outlet (112) is provided with a first outlet check valve which is opened in one direction toward the outside of the first cylinder body (11); the first liquid inlet (111) is connected to a liquid inlet pipe (5) for communicating with a detergent box; and the first liquid outlet (112) is connected to a transfer pipe (6); A first driving assembly (2) for driving the first piston (12) to extend and retract; The second piston cylinder (3) comprises a second piston (32) and a second cylinder body (31); one end of the second cylinder body (31) is provided with a second liquid inlet (311) and a second liquid outlet (312); the second liquid inlet (311) is provided with a second inlet check valve which is opened in one direction toward the inside of the second cylinder body (31); the second liquid outlet (312) is provided with a second outlet check valve which is opened in one direction toward the outside of the second cylinder body (31); the second liquid inlet (311) is connected to the transfer tube (6); and the second liquid outlet (312) is connected to a liquid outlet pipe (7) for communicating with the washing drum; The second driving assembly (4) is used for driving the second piston (32) to extend and retract.

2. The detergent dispensing mechanism according to claim 1, characterized in that: The second piston (32) comprises a second piston head (321) and a second piston rod (322) which are connected to each other, and the second piston rod (322) has an external thread; the second driving assembly (4) comprises a threaded sleeve (43) and a second motor (41), and the threaded sleeve (43) is sleeved on the second piston rod (322), and the second motor (41) is transmission-connected to the threaded sleeve (43), and the threaded sleeve (43) is driven to rotate by the second motor (41), so as to drive the second piston (32) to extend and retract.

3. The detergent dispensing mechanism according to claim 2, characterized in that: A driven gear (44) is provided on the outer periphery of the threaded sleeve (43); the second motor (41) is connected to a driving gear (42); the driving gear (42) meshes with the driven gear (44) to achieve transmission connection between the second motor (41) and the threaded sleeve (43).

4. The detergent dispensing mechanism according to claim 3, characterized in that: A rotating support (45) is fixedly mounted on one end of the second cylinder body (31) away from the second liquid inlet (311), and the threaded sleeve (43) is rotatably mounted on the rotating support (45).

5. The detergent dispensing mechanism according to claim 4, characterized in that: The rotating support (45) comprises a support upper shell (451) and a support lower shell (452), the support upper shell (451) and the support lower shell (452) are respectively provided with support bearings (454), and the two ends of the threaded sleeve (43) are respectively connected to the support bearings (454) to realize the rotating installation of the threaded sleeve (43); the support upper shell (451) covers the support lower shell (452), and a docking port (453) is provided on one side of the support upper shell (451) and / or the support lower shell (452), and the driving gear (42) extends into the rotating support (45) through the docking port (453) to mesh with the driven gear (44).

6. The detergent dispensing mechanism according to claim 1, characterized in that: The second cylinder body (31) comprises a cylinder barrel (313) and an expansion head (314) installed at one end of the cylinder barrel (313); the diameter of the expansion head (314) is larger than the diameter of the cylinder barrel (313); and the second liquid inlet (311) and the second liquid outlet (312) are both arranged on the expansion head (314).

7. The detergent dispensing mechanism according to claim 6, characterized in that: The expansion head (314) has a threaded connection nozzle, and the threaded connection nozzle is threadedly connected to the cylinder (313).

8. The detergent dispensing mechanism according to claim 1, characterized in that: The inner diameter of the first cylinder (11) is more than twice the inner diameter of the second cylinder (31), and the telescopic stroke of the first piston (12) is less than half the telescopic stroke of the second piston (32).

9. The detergent dispensing mechanism according to claim 8, characterized in that: The first piston (12) comprises a first piston head (121) and a first piston rod (122) which are connected to each other. A connecting head (123) is provided at one end of the first piston rod (122) away from the first piston head (121). The connecting head (123) is provided with a connecting long hole (124). The first driving component (2) comprises a first motor (21) and a rotating wheel (22). The rotating wheel (22) is connected to the output shaft of the first motor (21). A connecting column (23) eccentric to the first motor (21) is provided on the rotating wheel (22). The connecting column (23) is plugged into the long hole. The rotating wheel (22) is driven to rotate by the first motor (21) to drive the first piston (12) to extend and retract.

10. A washing machine, characterized in that: It comprises the detergent dispensing mechanism described in any one of claims 1-9.

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