Oral care device and liquid pump thereof

Abstract

The invention discloses a fluid pump and an oral care device, and relates to the technical field of fluid pumps. The liquid pump comprises a power assembly, a transmission assembly and a pump head assembly. The pump head assembly comprises a pump shell and a liquid pumping part, the liquid pumping part and the pump shell jointly form a pump cavity used for containing liquid, and the liquid pumping part is connected with the power assembly through the transmission assembly. In a single movement period of the liquid pump, the liquid pump comprises a liquid suction stroke, an energy storage stroke and a liquid pumping stroke, when the liquid pump is in the liquid suction stroke, a pump cavity becomes large, when the liquid pump is in the energy storage stroke, the pump cavity is roughly unchanged, when the liquid pump is in the liquid pumping stroke, the pump cavity becomes small, and the energy storage stroke is before the liquid pumping stroke. According to the technical scheme, the impact force of pumped water flow can be improved while the water consumption of the liquid pump is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fluid pumps, and in particular to an oral care device and a liquid pump thereof. Background Art

[0002] As people's quality of life improves, oral care devices such as water flossers are becoming increasingly common. These devices typically use a pulsed water flow to clean teeth and the spaces between teeth. The pump mechanism, a crucial component of the device, primarily serves to pump water under pressure.

[0003] In the related art, in order to make the water flosser convenient to carry, the volume of the water flosser and its matching water tank is set to be smaller, and the speed of the pump body is adjusted by adjusting the power supply voltage of the pump motor, thereby reducing the water consumption rate; however, under this adjustment method, the impact force of the water flow pumped out by the pump body will also be reduced, resulting in a decrease in the water flosser's ability to clean dental plaque on the tooth surface and food residues in the gaps between teeth. Summary of the Invention

[0004] The embodiments of the present application provide a liquid pump and an oral care device, which can reduce the water consumption of the liquid pump while increasing the impact force of the pumped water flow.

[0005] In a first aspect, an embodiment of the present application provides a liquid pump for an oral care device, comprising:

[0006] Powertrain and transmission components; and,

[0007] A pump head assembly, the pump head assembly comprising a pump housing and a liquid pumping member, the liquid pumping member and the pump housing together forming a pump chamber for containing liquid, and the liquid pumping member being connected to the power assembly via the transmission assembly;

[0008] Among them, in a single movement cycle of the liquid pump, the liquid pump includes a suction stroke, an energy storage stroke and a liquid pumping stroke. When the liquid pump is in the suction stroke, the pump cavity becomes larger, when the liquid pump is in the energy storage stroke, the pump cavity remains substantially unchanged, when the liquid pump is in the liquid pumping stroke, the pump cavity becomes smaller, and the energy storage stroke precedes the liquid pumping stroke.

[0009] In a second aspect, an embodiment of the present application provides an oral care device, comprising:

[0010] A liquid pump as described above; and

[0011] The liquid storage container and the nozzle are respectively connected to the pump of the liquid pump, and the liquid pump is used to suck the liquid medium in the liquid storage container and pump it out to the nozzle.

[0012] The technical solution of the present application is to set the stroke of the liquid pump in a single motion cycle to include a suction stroke, an energy storage stroke and a liquid pumping stroke. On the basis of realizing the liquid pump to periodically suck and pump water, an energy storage stroke is also added before the liquid pumping stroke. When the liquid pump is in the energy storage stroke, the volume of the pump chamber remains roughly unchanged, that is, the liquid pumping parts basically remain stationary; and the power component remains in a moving state, or the power component drives the transmission component to remain in a moving state to store energy in the energy storage stroke, so that after entering the liquid pumping stroke, the power component can quickly drive the liquid pumping parts to move through the transmission component, and make the liquid pumping parts have a larger acceleration, thereby shortening the duration of the liquid pumping stroke and increasing the flow rate and impact force of the pumped liquid.

[0013] At the same time, the volume of the pump chamber remains roughly unchanged when the liquid pump is in the energy storage stroke. That is, the maximum volume of the pump chamber will not be changed by increasing the energy storage stroke, and the small volume of the pump chamber can be maintained, achieving high-pressure and low-flow water discharge from the entire liquid pump, ensuring the impact force of the pumped liquid while reducing water consumption. On the other hand, by increasing the energy storage stroke, the duration of a single movement cycle of the liquid pump is longer than that of a stroke that only includes the suction stroke and the pumping stroke, and the pumping frequency of the liquid pump is reduced, which reduces the water consumption rate and further adapts to smaller liquid storage containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 the structures shown in these drawings without paying any creative work.

[0015] Figure 1 This is a schematic structural diagram of an embodiment of the oral care device of the present application;

[0016] Figure 2 This is a structural diagram of an embodiment of the liquid pump of the present application;

[0017] Figure 3 This is a structural diagram of another perspective of an embodiment of the liquid pump of the present application;

[0018] Figure 4 for Figure 3 Cross-sectional view at AA in the middle;

[0019] Figure 5 for Figure 3 Cross-sectional view at the middle BB;

[0020] Figure 6 This is a schematic diagram of the cooperation between the active member and the driven member in an embodiment of the liquid pump of the present application;

[0021] Figure 7 This is a structural diagram of the eccentric wheel in an embodiment of the liquid pump of the present application;

[0022] Figure 8 This is a schematic structural diagram of another embodiment of the liquid pump of the present application;

[0023] Figure 9 This is a structural diagram of another embodiment of the liquid pump of the present application;

[0024] Figure 10 This is an exploded schematic diagram of a pump head assembly in an embodiment of the liquid pump of the present application;

[0025] Figure 11 This is a structural diagram of a pump head assembly in an embodiment of the liquid pump of the present application;

[0026] Figure 12 for Figure 11 Cross-sectional view at CC.

[0027] Description of Figure Numbers:

[0028] 10. Liquid pump;

[0029] 100, power assembly; 110, power component; 120, clutch component;

[0030] 200, transmission assembly; 210, driving member; 211, eccentric wheel; 2111, second propulsion surface; 220, driven member; 221, connecting rod; 2211, sleeve portion; 2211a, first propulsion surface; 2211b, first free surface; 2211c, stop surface; 2212, limiting rib; 230, first elastic member; 240, transmission member; 241, first limiting portion; 250, driving gear; 260, pushing rack; 270, fixing bracket; 271, connecting cavity; 280, first gear; 290, second gear;

[0031] 300, pump head assembly; 310, pump housing; 311, pump head; 3111, fixing groove; 312, main body; 313, first flow channel; 3131, liquid inlet; 314, second flow channel; 3141, liquid outlet; 315, first one-way valve; 316, second one-way valve; 320, pumping element; 321, center portion; 3211, plug connector; 322, elastic portion; 323, fixing portion; 330, pump chamber; 340, reset element; 341, push rod; 3411, second limiting portion; 342, second elastic member; 350, mounting chamber; 360, gland;

[0032] 20. Oral care device; 21. Nozzle;

[0033] L1, first ray; L2, second ray; X, first direction; Y, second direction; a, first point; b, second point.

[0034] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0036] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0037] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0039] See also Figure 1 The present application provides a liquid pump 10 and an oral care device 20. The oral care device 20 includes a liquid pump 10, a liquid storage container, and a nozzle 21. The liquid storage container and the nozzle 21 are respectively connected to the pump chamber 330 of the liquid pump 10. The liquid pump 10 is used to suck the liquid medium in the liquid storage container and pump it out to the nozzle 21. When in use, the user can point the nozzle 21 toward the oral cavity so that the pumped liquid medium (such as clean water, mouthwash, or liquid medicine, etc.) is sprayed into the user's oral cavity in a direction to achieve oral care.

[0040] For example, the oral care device 20 may include, but is not limited to, an oral irrigator and a toothbrush with an irrigating function.

[0041] The oral care device pumps out a high-pressure liquid medium in a pulsed manner to spray and clean the teeth and the gaps between teeth. The liquid pump, as a crucial component in the oral care device, mainly plays the role of pressurizing and pumping out the liquid medium. The pressure of the pumped liquid medium will directly affect the cleaning effect of the oral cavity. In the related art, in order to facilitate the portability of the oral care device, the volume of the oral care device and its matching liquid storage container is set to be smaller, and the speed of the liquid pump is adjusted by adjusting the power supply voltage of the motor in the liquid pump to reduce the water consumption rate; however, under this adjustment method, the impact force of the liquid medium pumped out by the liquid pump will also be reduced, and it will not be able to effectively wash away the dental plaque on the surface of the teeth and the food residue in the gaps between the teeth, resulting in a decrease in the cleaning and care effect of the oral care device.

[0042] See also Figures 2 to 4 In this embodiment, the liquid pump 10 includes a power assembly 100, a transmission assembly 200 and a pump head assembly 300. The pump head assembly 300 includes a pump housing 310 and a liquid pumping member 320. The liquid pumping member 320 and the pump housing 310 together form a pump chamber 330 for accommodating liquid, and the liquid pumping member 320 is connected to the power assembly 100 through the transmission assembly 200. In a single motion cycle of the liquid pump 10, the liquid pump 10 includes a liquid suction stroke, an energy storage stroke and a liquid pumping stroke. When the liquid pump 10 is in the liquid suction stroke, the pump chamber 330 becomes larger. When the liquid pump 10 is in the energy storage stroke, the pump chamber 330 remains substantially unchanged. When the liquid pump 10 is in the liquid pumping stroke, the pump chamber 330 becomes smaller, and the energy storage stroke precedes the liquid pumping stroke.

[0043] It can be understood that during the suction stroke, the volume of the pump chamber 330 increases to generate negative pressure, which can achieve the purpose of sucking liquid into the pump chamber 330; during the pumping stroke, the volume of the pump chamber 330 decreases to discharge the liquid in the pump chamber 330, and when the maximum volume of the pump chamber 330 remains unchanged, the shorter the duration of the pumping stroke, the faster the flow rate of the liquid pumped out by the liquid pump 10, and the stronger the impact force.

[0044] By setting the stroke of the liquid pump 10 in a single motion cycle to include a suction stroke, an energy storage stroke and a liquid pumping stroke, on the basis of realizing the liquid pump 10 can periodically suck and pump water, an energy storage stroke is also added before the liquid pumping stroke. When the liquid pump 10 is in the energy storage stroke, the volume of the pump chamber 330 remains roughly unchanged, that is, the liquid pumping part 320 basically remains stationary; and the power component 100 remains in a moving state, or the power component 100 drives the transmission component 200 to remain in a moving state to store energy in the energy storage stroke, so that after entering the liquid pumping stroke, the power component 100 can quickly drive the liquid pumping part 320 to move through the transmission component 200, and make the liquid pumping part 320 have a larger acceleration, thereby shortening the duration of the liquid pumping stroke and increasing the flow rate and impact force of the pumped liquid.

[0045] At the same time, the volume of the pump chamber 330 remains roughly unchanged when the liquid pump 10 is in the energy storage stroke. That is, the maximum volume of the pump chamber 330 will not change due to the increase in the energy storage stroke. The small volume of the pump chamber 330 can be maintained, achieving high-pressure, low-flow water discharge from the entire liquid pump 10, ensuring the impact force of the pumped liquid while reducing water consumption. On the other hand, by increasing the energy storage stroke, the duration of a single motion cycle of the liquid pump 10 is lengthened compared to a cycle that only includes the suction stroke and the pumping stroke, and the pumping frequency of the liquid pump 10 is reduced, that is, the water consumption rate is reduced, further adapting to smaller liquid storage containers.

[0046] It should be noted that the volume of the pump chamber 330 remains roughly unchanged when the liquid pump 10 is in the energy storage stroke, which means that the pump liquid component 320 remains basically stationary, that is, in the energy storage stroke, the pump liquid component 320 can remain stationary relative to the pump housing 310 so that the volume of the pump chamber 330 remains unchanged. The pump liquid component 320 can also make a small displacement relative to the pump housing 310. At this time, the volume change of the pump chamber 330 is less than 5% of the maximum volume of the pump chamber 330, and the impact on the subsequent pumping stroke of the liquid pump 10 can be ignored. Therefore, in this case, the volume of the pump chamber 330 can be uniformly regarded as remaining unchanged.

[0047] Specifically, the suction stroke can be performed after the pumping stroke or before the energy storage stroke. It is understandable that at the end position of the pumping stroke, the pumping member 320 stops moving. When the suction stroke is performed after the pumping stroke, the pumping member 320 performs reverse movement and the speed begins to accelerate. Since the energy accumulated by the power component 100 in the energy storage stroke has been consumed in the pumping stroke, the speed of the pumping member 320 in the suction stroke is slower, that is, the duration of the suction stroke becomes longer, the duration of a single motion cycle of the liquid pump 10 becomes longer, and the pumping frequency of the liquid pump 10 becomes lower, that is, the water consumption rate is reduced.

[0048] Accordingly, when the suction stroke is performed before the energy storage stroke, the liquid pump 10 first stores liquid through the suction stroke, then accumulates energy through the energy storage stroke, and finally drains water through the pumping stroke. Because the power assembly 100 has not stored energy before the stroke begins, and the energy transmitted from the power assembly 100 to the pumping element 320 via the transmission assembly 200 is ineffectively lost, the speed of the pumping element 320 is zero and the acceleration is small at the beginning of the suction stroke. Therefore, the speed of the pumping element 320 during the suction stroke is slow, that is, the duration of the suction stroke is prolonged, the duration of a single motion cycle of the liquid pump 10 is prolonged, and the pumping frequency of the liquid pump 10 is reduced, that is, the water consumption rate is reduced.

[0049] It will be appreciated that in some embodiments, the suction stroke and pumping stroke of the liquid pump 10 satisfy the following conditions: the average speed of the suction stroke is less than the average speed of the pumping stroke. This indicates that the liquid pump 10 has a faster pumping speed, resulting in a faster flow rate of the pumped liquid and a stronger impact force. Furthermore, the slower suction speed increases the duration of a single motion cycle of the liquid pump 10, reducing the pumping frequency of the liquid pump 10 and, therefore, reducing water consumption.

[0050] Similarly, in some embodiments, the suction stroke and the pumping stroke of the liquid pump 10 satisfy the following conditions: the duration of the suction stroke is greater than the duration of the pumping stroke. Since the pumping member 320 moves the same distance in the suction stroke and the pumping stroke, and moves in opposite directions, when the duration of the suction stroke is greater than the duration of the pumping stroke, it indicates that the average speed of the suction stroke is less than the average speed of the pumping stroke, and the liquid pump 10 has a faster pumping speed, a faster flow rate of the pumped liquid, and a stronger impact force. At the same time, a longer suction stroke duration lengthens the duration of a single motion cycle of the liquid pump 10, and the pumping frequency of the liquid pump 10 becomes lower, which reduces the water consumption rate.

[0051] Accordingly, in some embodiments, the suction stroke and pumping stroke of the liquid pump 10 satisfy the following conditions: the liquid pressure during the suction stroke is less than the liquid pressure during the pumping stroke. It is understood that the higher the pressure of the liquid pumped by the liquid pump 10, the stronger the impact force of the liquid and the corresponding faster the liquid flow rate. When the liquid pressure during the suction stroke is less than the liquid pressure during the pumping stroke, the impact force of the liquid pumped by the liquid pump 10 is stronger and the flow rate of the pumped liquid is faster.

[0052] See also Figure 4 and Figure 5 In some embodiments, the power assembly 100 rotates and reverses back and forth within a preset angle range.

[0053] The following description is made by taking the liquid pump 10 as an example, wherein the liquid pump 10 successively performs a suction stroke, an energy storage stroke, and a liquid pumping stroke within a single motion cycle. Specifically, the power assembly 100 can be reversed after the liquid pump 10 completes a single motion cycle, that is, the direction of the power assembly 100 remains unchanged within a single motion cycle of the liquid pump 10. After the liquid pump 10 enters the next motion cycle, the direction of the liquid pumping member 320 is reversed by the reversal of the power assembly 100, so that the liquid pumping member 320 can immediately perform a suction stroke opposite to the moving direction of the liquid pumping stroke in the previous motion cycle after entering the next motion cycle. The energy storage stroke is located between the suction stroke and the liquid pumping stroke, so that the power assembly 100 can also store energy during the suction stroke to increase the speed of the liquid pumping member 320 in the liquid pumping stroke.

[0054] The following description assumes that the liquid pump 10 successively performs an energy storage stroke, a liquid pumping stroke, and a liquid suction stroke within a single motion cycle. Specifically, the power assembly 100 can reverse after the liquid pump 10 completes the liquid pumping stroke, that is, the power assembly 100 performs a reversing motion within a single motion cycle of the liquid pump 10. By reversing the power assembly 100, the liquid pumping member 320 can be reversed between the liquid pumping stroke and the liquid suction stroke, so that the energy accumulated by the power assembly 100 during the energy storage stroke can be effectively used to increase the speed of the liquid pumping member 320 during the liquid pumping stroke.

[0055] Optionally, in some embodiments, the pumping stroke is located at the end of the rotation stroke of the power assembly 100, and the suction stroke is located at the starting end of the rotation stroke of the power assembly 100. For example, the power assembly 100 reverses after the liquid pump 10 completes a single motion cycle, and the direction of the power assembly 100 remains unchanged during a single motion cycle of the liquid pump 10. At the starting position of a single motion cycle of the liquid pump 10, the power assembly 100 starts to rotate and drives the pumping part 320 to perform the suction stroke through the transmission assembly 200, and in the subsequent time, the power assembly 100 keeps rotating, and after accumulating energy in the energy storage stroke, drives the pumping part 320 to perform the pumping stroke through the transmission assembly 200, and after completing the pumping stroke, the liquid pump 10 correspondingly completes a single motion cycle, and the power assembly 100 stops moving or performs a reversing motion.

[0056] It is understandable that the kinetic energy of the power assembly 100 is relatively small when it starts to rotate. Therefore, when the liquid suction stroke is at the starting end of the rotation stroke of the power assembly 100, the energy ultimately transferred to the pumping part 320 is also relatively small. The speed of the pumping part 320 in the liquid suction stroke is relatively slow, which makes the duration of the liquid suction stroke longer, the duration of a single motion cycle of the liquid pump 10 longer, and the pumping frequency of the liquid pump 10 lower, thereby reducing the water consumption rate. The kinetic energy of the power assembly 100 increases after accumulating energy in the energy storage stroke. When the pumping stroke is at the end of the rotation stroke of the power assembly 100, most of the energy accumulated by the power assembly 100 in the energy storage stroke is transferred to the pumping part 320, so that the pumping part 320 completes the pumping stroke at a faster speed and has a greater acceleration, thereby shortening the duration of the pumping stroke and increasing the flow rate and impact force of the pumped liquid.

[0057] In some embodiments, the power assembly 100 has a downtime period before the reversing motion. During the downtime period, the power assembly 100 stops running.

[0058] As can be seen from the above, the reversing movement of the power assembly 100 is between the pumping stroke and the suction stroke, and can be within a single motion cycle of the liquid pump 10 or between two adjacent motion cycles. Optionally, when the reversing movement of the power assembly 100 is within a single motion cycle of the liquid pump 10, by setting a downtime period before the reversing movement of the power assembly 100, the duration of a single motion cycle of the liquid pump 10 can be increased, the pumping frequency of the liquid pump 10 can be reduced, and thus the water consumption rate can be reduced. When the reversing movement of the power assembly 100 is between two adjacent motion cycles, by setting a downtime period between two adjacent motion cycles, the pumping frequency of the liquid pump 10 can also be reduced, thereby reducing the water consumption rate. At the same time, after setting the downtime period, the pumping frequency of the liquid pump 10 can be adjusted by controlling the specific duration of the downtime period, that is, when the pumping frequency of the liquid pump 10 needs to be reduced, the downtime period can be delayed, and when the pumping frequency of the liquid pump 10 needs to be relatively increased, the downtime period can be shortened or even cancelled.

[0059] It should be noted that when the liquid pump 10 is in the energy storage stroke, the power assembly 100 is in an operating state to ensure that the power assembly 100 itself can accumulate energy, or to ensure that the transmission assembly 200 connected to the power assembly 100 can accumulate energy. When the liquid pump 10 is in the pumping stroke, the power assembly 100 is in an operating state to drive the pumping member 320 to move through the transmission assembly 200, and partially transfer the energy accumulated in the energy storage stroke to the pumping member 320, so that the pumping member 320 has a greater acceleration, and can pump out the liquid medium in the pump chamber 330 at a faster speed, thereby increasing the flow rate and impact force of the pumped liquid. When the liquid pump 10 is in the suction stroke, the power assembly 100 is in an operating state to drive the pumping member 320 to move through the transmission assembly 200, so that the volume of the pump chamber 330 gradually increases to suck the liquid into the pump chamber 330.

[0060] It is understood that when the liquid pump 10 is in the pumping stroke, it is necessary to operate the power assembly 100 and drive the pumping member 320 to move through the transmission assembly 200, which is in transmission connection with the power assembly 100. This converts the energy of the power assembly 100 into kinetic energy of the transmission assembly 200 and the pumping member 320, enabling the pumping member 320 to complete the pumping stroke with a greater acceleration. Therefore, when the liquid pump 10 is in the pumping stroke, the power assembly 100, the transmission assembly 200, and the pump head assembly 300 are in a coordinated state, so as to link the pumping member 320 to move when the power assembly 100 is running.

[0061] In some embodiments, when the liquid pump 10 is in the energy storage stroke, the transmission assembly 200 is in a disengaged state, so that the pumping element 320 is not driven to move when the power assembly 100 is in operation. That is, during the energy storage stroke, the transmission assembly 200 maintains its own motion without driving the pumping element 320 to move. Consequently, no energy is consumed to be converted into kinetic energy for the pumping element 320, thus achieving energy accumulation.

[0062] Optionally, the transmission assembly 200 includes an active part 210 and a driven part 220, the active part 210 is connected to the power assembly 100, and the driven part 220 is connected to the pumping part 320. When the transmission assembly 200 is in the pumping stroke, the active part 210 and the driven part 220 are in a mating state. When the transmission assembly 200 is in the energy storage stroke, the active part 210 and the driven part 220 are in a separated state.

[0063] Please continue reading Figure 4 and Figure 5 Specifically, in some embodiments, the driven member 220 includes a connecting rod 221, which extends along the first direction X, one end of the connecting rod 221 is connected to the pumping member 320, and the other end has a ring-shaped sleeve portion 2211; the active member 210 includes an eccentric wheel 211, and the eccentric wheel 211 is configured to rotate around the second direction Y in the sleeve portion 2211 under the drive of the power assembly 100; the first direction X is perpendicular to the second direction Y; the connecting rod 221 drives the pumping member 320 to reciprocate in the first direction X through the rotating eccentric wheel 211.

[0064] When the liquid pump 10 is in the energy storage stroke, the eccentric 211 and the shaft sleeve 2211 are in a clearance fit or virtual fit to idle. The virtual fit between the eccentric 211 and the shaft sleeve 2211 means that the eccentric 211 contacts the inner wall surface of the shaft sleeve 2211, but the eccentric 211 does not drive the connecting rod 221 to move when it rotates; the clearance fit between the eccentric 211 and the shaft sleeve 2211 means that the eccentric 211 does not contact the inner wall surface of the shaft sleeve 2211, and then the eccentric 211 does not drive the connecting rod 221 to move when it rotates. That is, through the clearance fit or virtual fit between the eccentric 211 and the shaft sleeve 2211, the eccentric 211 and the connecting rod 221 are kept separated. Then, while the eccentric 211 continues to rotate to accumulate energy, the energy is prevented from being transferred to the connecting rod 221, so that the connecting rod 221 and the liquid pumping part 320 remain stationary.

[0065] When the liquid pump 10 is in the suction stroke and the pumping stroke, the power assembly 100, the transmission assembly 200 and the pump head assembly 300 are in a coordinated state, so as to link the pumping member 320 to move when the power assembly 100 is running. Specifically, the eccentric wheel 211 abuts against the inner wall surface of the shaft sleeve portion 2211, and as the power assembly 100 drives the eccentric wheel 211 to rotate, the eccentric wheel 211 pushes the shaft sleeve portion 2211, and the abutment between the eccentric wheel 211 and the inner wall surface of the shaft sleeve portion 2211 rotates from a position relatively far away from the pumping member 320 to a position relatively close to the pumping member 320, thereby driving the connecting rod 221 toward the pumping member 320, and then driving the pumping member 320 to move to reduce the volume of the pump chamber 330, and the liquid pump 10 pumps liquid. When the contact point between the eccentric wheel 211 and the inner wall of the sleeve portion 2211 rotates from a position relatively close to the pumping member 320 to a position relatively far away from the pumping member 320, the connecting rod 221 is driven to move away from the pumping member 320, thereby driving the pumping member 320 to move to increase the volume of the pump chamber 330, and the liquid pump 10 starts to suck liquid. In other words, when the liquid pump 10 is in the suction stroke and the pumping stroke, the eccentric wheel 211 and the sleeve portion 2211 slide together to drive the connecting rod 221 to reciprocate in the first direction X.

[0066] Furthermore, the power assembly 100 drives the eccentric wheel 211 to rotate back and forth within a preset angle range, and the preset angle is less than 360°. As can be seen from the above, when the eccentric wheel 211 rotates within the preset angle range, it has two different states: driving the connecting rod 221 to move synchronously and not driving the connecting rod 221 to move. Only when the eccentric wheel 211 drives the connecting rod 221 to move synchronously can the pumping part 320 change the volume of the pump chamber 330 to achieve pumping and suctioning liquid. By setting the rotation range of the eccentric wheel 211 to less than 360°, the rotation range of the eccentric wheel 211 is smaller than that of the eccentric wheel 211 rotating completely one circle, and the shaft sleeve part 2211 adapted thereto can also be set to be smaller, which is conducive to the miniaturization design of the liquid pump 10 and the oral care device 20. At the same time, compared with the eccentric wheel 211 rotating 180° in both the suction stroke and the pumping stroke, by setting the rotation range of the eccentric wheel 211 to less than 360° and increasing the energy storage stroke in which the eccentric wheel 211 does not drive the connecting rod 221 to move, the total displacement of the connecting rod 221 in the pumping stroke can be reduced, and the volume of the pump chamber 330 can be set smaller, which is further beneficial to the miniaturized design of the liquid pump 10 and the oral care device 20.

[0067] See also Figure 6In some embodiments, the inner wall surface of the sleeve portion 2211 includes a first propulsion surface 2211a and a first free surface 2211b, and the eccentric wheel 211 has a second propulsion surface 2111. When the liquid pump 10 is in the energy storage stroke, the second propulsion surface 2111 and the first free surface 2211b are clearance-fitted or virtually fit together. When the liquid pump 10 is in the liquid suction stroke and the liquid pumping stroke, the second propulsion surface 2111 and the first propulsion surface 2211a are slidingly fit together. When the liquid pump 10 is in the energy storage stroke, when the eccentric wheel 211 rotates a preset angle θ, the displacement of any point on the second propulsion surface 2111 in the first direction X is a. When the liquid pump 10 is in the liquid pumping stroke, when the eccentric wheel 211 rotates a preset angle θ, the displacement of the same any point on the second propulsion surface 2111 in the first direction X is b, and b is greater than a.

[0068] It should be noted that, on the radial cross-section of the eccentric 211, a coordinate system is established with the rotation center of the eccentric 211 as the origin and the first direction X as the vertical axis. During the rotation of the eccentric 211, the vertical coordinate and horizontal coordinate of any point on the second propulsion surface 2111 change accordingly. During the pumping stroke, the change in the vertical coordinate of any point on the second propulsion surface 2111 is regarded as the displacement of the connecting rod 221 in the first direction X. On the same side of the longitudinal axis, if the eccentric wheel 211 rotates by a preset angle θ during the energy storage stroke, the displacement of any point on the second propulsion surface 2111 in the first direction X is a, that is, the change in the longitudinal coordinate of the point is a; and when the eccentric wheel 211 rotates by the same angle θ during the pumping stroke, the displacement of the point in the first direction X is b, that is, the change in the longitudinal coordinate of the point is b; this indicates that the eccentric wheel 211 can more effectively drive the connecting rod 221 to move in the first direction X during the pumping stroke, so that the connecting rod 221 and the pumping member 320 have a greater linear velocity, and the liquid medium in the pump chamber 330 can be pumped out at a faster speed, thereby increasing the flow rate and impact force of the pumped liquid.

[0069] See also Figure 6 and Figure 7 Furthermore, in some embodiments, on the radial cross-section of the eccentric wheel 211, the projection of the rotation axis of the eccentric wheel 211 is the first point a, and the projection of the rotation axis of the second propulsion surface 2111 is the second point b. A first ray L1 and a second ray L2 are formed with the first point a as endpoints. The first ray L1 passes through the second point b, and the second ray L2 extends in a direction away from the pumping component 320 and is parallel to the first direction X; wherein, within the pumping stroke, the angle θ1 between the first ray L1 and the second ray L2 gradually changes from an acute angle to an obtuse angle.

[0070] It is understood that the calculation formula for the rotation radius R of the second propulsion surface 2111 is: R = r + L; where r is the rotation radius of the second propulsion surface 2111 (the distance from the second propulsion surface 2111 to its rotation axis), and L is the eccentricity of the second propulsion surface 2111 (the distance from the rotation axis of the second propulsion surface 2111 to the rotation axis of the eccentric wheel 211). Taking the point where the second propulsion surface 2111 is located on the first ray L1 as the reference point, the coordinates of the reference point are (Rsinθ1, -Rcosθ1); if θ1 = θ2, the liquid pump 10 enters the pumping stroke, and the coordinates of the reference point are (Rsinθ2, -Rcosθ2). When the eccentric 211 continues to rotate by angle x, the change in the ordinate of the reference point is ΔR = Rcosθ2 - Rcos(θ2+x). The change in the ordinate of the reference point can be considered as the displacement of the connecting rod 221 and the pumping element 320 in the first direction X. From this, it can be concluded that the instantaneous linear velocity of the pumping element 320 is ΔR / Δt = Rsin(θ2+x)(Δx / Δt), where is the time it takes for the eccentric 211 to rotate by angle x, and Δx / Δt is the angular velocity ω of the eccentric 211. Therefore, the instantaneous linear velocity of the pumping element 320 is ΔR / Δt = Rωsin(θ2+x). Therefore, when sin(θ2+x) = 1, that is, when θ1 = θ2+x = 90°, the instantaneous linear velocity of the pumping element 320 is the maximum. During the pumping stroke, the angle θ1 between the first ray L1 and the second ray L2 gradually changes from an acute angle to an obtuse angle, which means that within the pumping stroke, there is a moment when θ1 = 90°, which can maximize the conversion of the angular displacement of the eccentric wheel 211 into the linear displacement of the pumping component 320 in the first direction X; the pumping component 320 can complete the pumping process at a higher linear speed, and the liquid medium in the pump chamber 330 can be pumped out at a faster speed, thereby increasing the flow rate and impact force of the pumped liquid.

[0071] Optionally, in some embodiments, at the end point of the pumping stroke, the angle θ1 between the first ray L1 and the second ray is no greater than 160°. That is, the rotation angle of the eccentric wheel 211 within the pumping stroke is no greater than 160°. Compared to a 180° rotation of the eccentric wheel 211 within the pumping stroke, the total displacement of the pumping member 320 within the pumping stroke can be reduced, and the volume of the pump chamber 330 can be set to a smaller size, which is conducive to the miniaturization of the liquid pump 10 and the oral care device 20.

[0072] As can be seen from the above, when the eccentric wheel 211 rotates within the angular range of 90±x within the pumping stroke, the pumping member 320 can have a greater linear velocity. For example, x can be 30, 20, 10, etc., and correspondingly, the eccentric wheel 211 rotates within the angle θ1 within the pumping stroke within a range of 60°-120°, 70°-110°, 80°-100°, etc., that is, when the value of x ranges from 10°-30°, the rotation angle of the eccentric wheel 211 is not less than 20° and not greater than 60°.

[0073] On the one hand, when θ2+x=90° and x is within the range of 10°-30°, the instantaneous linear velocity of the pumping component 320 within the pumping stroke is relatively large, and the angular displacement of the eccentric wheel 211 can be maximized to be converted into the linear displacement of the pumping component 320 in the first direction X, so as to pump out the liquid medium in the pump chamber 330 at a faster speed, thereby increasing the flow rate and impact force of the pumped liquid. On the other hand, the rotation angle of the eccentric wheel 211 is not less than 20° and not more than 60°, indicating that within the pumping stroke, the rotation angle of the eccentric wheel 211 is much less than 180°, and the displacement of the pumping part 320 during the pumping stroke is also shortened accordingly, which is beneficial to the small volume design of the pump chamber 330; at the same time, the time occupied by the pumping stroke in a single motion cycle of the liquid pump 10 is reduced. Under the same operating time, the duration of the pumping stroke can be shortened. While increasing the flow rate and impact force of the pumped liquid, the pumping frequency is reduced, and the water consumption rate is reduced, which is beneficial to the miniaturization design of the oral care device 20.

[0074] Optionally, in some embodiments, the eccentricity L of the second propulsion surface 2111 is not less than 0.5 mm and not greater than 5 mm. When the eccentricity L is too large, the rotation radius of the eccentric wheel 211 increases, and the volume of the sleeve portion 2211 increases accordingly, resulting in an increase in the volume of the liquid pump 10; and when the eccentricity L is too large, the torque when the eccentric wheel 211 pushes against the sleeve portion 2211 increases, which easily accelerates the wear between the eccentric wheel 211 and the sleeve portion 2211, affecting the service life of the liquid pump 10. When the eccentricity L is too small, the effect of the eccentric wheel 211 in driving the connecting rod 221 to move synchronously during the suction stroke and the pumping stroke is limited, and when the eccentric wheel 211 pushes against the sleeve portion 2211, the friction between the eccentric wheel 211 and the sleeve portion 2211 will increase significantly, which may cause the liquid pump 10 to run jammed, affecting its normal working efficiency.

[0075] Therefore, the eccentricity L of the second propulsion surface 2111 is set to be no less than 0.5 mm and no more than 5 mm to ensure that the eccentricity L of the second propulsion surface 2111 is set within an appropriate range. Specifically, in some embodiments, the eccentricity L of the second propulsion surface 2111 is 2.5 mm.

[0076] Optionally, in some embodiments, during the pumping stroke, the displacement of the pumping member 320 in the first direction X is not less than 0.5 mm and not more than 5 mm.

[0077] It is understood that the liquid pump 10 changes the volume of the pump chamber 330 by moving the pumping element 320 to change the pressure within the pump chamber 330 to achieve liquid suction and pumping. Therefore, the total displacement of the pumping element 320 in the first direction X during the pumping stroke reflects the maximum volume of the pump chamber 330. When the displacement of the pumping element 320 in the first direction X is too large, it indicates that the maximum volume of the pump chamber 330 is too large, which is not conducive to the miniaturization design of the liquid pump 10 and causes too much liquid to be sucked in and pumped out at a time, ultimately leading to an increase in water consumption rate. When the displacement of the pumping element 320 in the first direction X is too small, it indicates that the maximum volume of the pump chamber 330 is too small. On the one hand, the pumping element 320 cannot increase the speed to a high value within a short displacement, affecting the impact force of the pumped liquid; on the other hand, if the amount of liquid pumped out is too small, it affects the normal cleaning effect.

[0078] Therefore, during the pumping stroke, the displacement of the pumping member 320 in the first direction X is set to be no less than 0.5 mm and no more than 5 mm to ensure that the maximum volume of the pump chamber 330 is set within an appropriate range. Specifically, in some embodiments, during the pumping stroke, the displacement of the pumping member 320 in the first direction X is 1.5 mm.

[0079] Please continue reading Figure 6 In some embodiments, the inner wall surface of the sleeve portion 2211 includes two first propulsion surfaces 2211a arranged on opposite sides of the rotation axis of the eccentric wheel 211, and the first free surface 2211b is located between the two first propulsion surfaces 2211a; within a single motion cycle, the direction of the eccentric wheel 211 remains unchanged.

[0080] It is understood that when the liquid pump 10 is in the suction stroke and the pumping stroke, the second propulsion surface 2111 slides with the first propulsion surface 2211a to drive the connecting rod 221 to move in the first direction X. When the liquid pump 10 is in the suction stroke, the second propulsion surface 2111 slides with the first propulsion surface 2211a on one side, driving the connecting rod 221 to move away from the pumping member 320, and then driving the pumping member 320 to move synchronously to increase the volume of the pump chamber 330 for suction. The liquid pump 10 then enters the energy storage stroke, and the eccentric 211 continues to operate under the drive of the power assembly 100. The second propulsion surface 2111 and the first free surface 2211b are in a clearance fit or virtual fit, and the eccentric 211 accumulates energy without driving the connecting rod 221 to move. The liquid pump 10 then enters its pumping stroke, where the second propulsion surface 2111 slidably engages the first propulsion surface 2211a on the other side, driving the connecting rod 221 toward the pumping element 320. This in turn drives the pumping element 320 to move synchronously, reducing the volume of the pump chamber 330 to pump liquid, and the liquid pump 10 finally completes one cycle. When the liquid pump 10 enters the next cycle, the power assembly 100 reverses direction, driving the eccentric wheel 211 to reverse synchronously, repeating the suction stroke, energy storage process, and pumping process.

[0081] By providing two first propulsion surfaces 2211a on opposite sides of the rotation axis of the eccentric 211, the eccentric 211 does not need to reverse direction during the sequential completion of the suction stroke, energy storage process, and liquid pumping process. The eccentric 211 can move continuously within the sleeve portion 2211, continuously storing energy before the liquid pumping process, thereby rapidly increasing the movement speed of the connecting rod 221 and the liquid pumping member 320 after entering the liquid pumping process. At the same time, the inner wall surface of the sleeve portion 2211 is provided with two first propulsion surfaces 2211a for the suction stroke and the liquid pumping process, respectively. This further reduces the rotation angle of the eccentric 211 during the suction stroke and the liquid pumping process, thereby reducing the maximum volume of the pump chamber 330, which is conducive to the miniaturization of the liquid pump 10 and the oral care device 20.

[0082] Furthermore, in some embodiments, the inner wall surface of the sleeve portion 2211 also includes a stop surface 2211c, which is arranged opposite to the first free surface 2211b and is smoothly connected to the two first propulsion surfaces 2211a respectively. When the second propulsion surface 2111 abuts against the stop surface 2211c, the side of the pumping member 320 facing away from the follower 220 abuts against the inner wall of the pump housing 310.

[0083] By setting the stop surface 2211c, the eccentric wheel 211 abuts against the stop surface 2211c after completing the pumping stroke. On the one hand, when the eccentric wheel 211 abuts against the stop surface 2211c, the stop surface 2211c can play a certain stopping role on the eccentric wheel 211; on the other hand, when the eccentric wheel 211 completes the pumping stroke, the side of the pumping component 320 away from the follower 220 abuts against the inner wall of the pump housing 310, that is, the pumping component 320 moves to the extreme position in the first direction X. Under the stop of the inner wall of the pump housing 310, the pumping component 320 cannot continue to move, that is, the eccentric wheel 211 is restricted from continuing to rotate.

[0084] It can be understood that as the eccentric wheel 211 rotates, both the ordinate and abscissa of the reference point change. When the liquid pump 10 is in the pumping stroke, the change in the ordinate of the reference point can be considered as the displacement of the connecting rod 221 and the pumping member 320 in the first direction X. Similarly, the change in the abscissa of the reference point will also cause the displacement of the connecting rod 221 and the pumping member 320 in the transverse axis. To prevent the displacement of the pumping member 320 due to the movement of the connecting rod 221 in the transverse axis, in some embodiments, the outer periphery of the sleeve portion 2211 is provided with limiting ribs 2212. The limiting ribs 2212 at least abut against the inner walls of the pump housing 310 on opposite sides along the first direction X. By abutting the inner walls of the pump housing 310 on opposite sides along the first direction X, the limiting ribs 2212 limit the movement of the sleeve portion 2211 in the transverse axis, thereby preventing the connecting rod 221 from causing the pumping member 320 to move in the transverse axis.

[0085] In some embodiments, when the liquid pump 10 is in the energy storage stroke, the power assembly 100 is in a disengaged state, so that the pumping element 320 is not driven to move when the power assembly 100 is in operation. That is, during the energy storage stroke, the power assembly 100 maintains its own operation without driving the transmission assembly 200 and the pumping element 320 to move. Consequently, there is no need to consume energy to convert it into kinetic energy for the transmission assembly 200 and the pumping element 320, thus achieving energy accumulation.

[0086] Optionally, the power assembly 100 includes a power part 110 and a clutch part 120. The power part 110 is connected to the transmission assembly 200 through the clutch part 120. When the power assembly 100 is in the pumping stroke, the clutch part 120 is in the engaged state. When the power assembly 100 is in the energy storage stroke, the clutch part 120 is in the disengaged state.

[0087] See also Figure 8 Specifically, in some embodiments, the power member 110 is a motor; the clutch member 120 is a clutch, the clutch has a driving shaft and a driven shaft, the driving shaft is connected to the output shaft of the motor, and the driven shaft is connected to the transmission assembly 200; the driving shaft and the driven shaft have a separated state of disconnecting the transmission, and a matched state of mutual transmission.

[0088] When the liquid pump 10 is in the liquid suction stroke, the clutch is in the engaged state, the driving shaft and the driven shaft maintain transmission, and the driving shaft drives the pumping member 320 to move together through the driven shaft, sucking the liquid medium into the pump chamber 330.

[0089] When the liquid pump 10 is in the energy storage stroke, the output shaft of the motor keeps rotating, but the driving shaft and the driven shaft of the clutch are switched to a separated state in which the transmission is disconnected, that is, the power component 100 itself is in a separated state, so that the driving shaft can accelerate and rotate to accumulate energy under the drive of the output shaft. However, since the driven shaft and the driving shaft are disconnected from the transmission, the driven shaft cannot drive the transmission component 200 to move synchronously, so that the pumping part 320 remains stationary and the volume of the pump chamber 330 remains unchanged.

[0090] When the liquid pump 10 is in the pumping stroke, the clutch is switched back to the engaged state, the driving shaft and the driven shaft maintain transmission, and the driving shaft transfers part of the stored energy to the pump through the driven shaft, thereby accelerating the movement of the pumping part 320 to pump out the liquid medium in the pump chamber 330 at a faster speed, thereby increasing the flow rate and impact force of the pumped liquid.

[0091] Taking the transmission assembly 200 described above as including a connecting rod 221 and an eccentric 211 as an example, the driven shaft of the clutch is connected to the eccentric 211 in a transmission manner, thereby driving the eccentric 211 to rotate within the sleeve portion 2211. Specifically, the driving shaft and the driven shaft of the clutch can be arranged to extend along the second direction Y, and the driven shaft is directly connected to the eccentric 211 to drive the eccentric 211 to rotate about the second direction Y. The driving shaft and the driven shaft of the clutch can also be arranged to extend along the first direction X. In this case, the transmission assembly 200 also includes a first gear 280 and a second gear 290. The first gear 280 is connected to the driven shaft and is configured to rotate about the second direction Y under the drive of the driven shaft; the second gear 290 is meshed with the first gear 280 and is configured to rotate about the first direction X under the drive of the first gear 280; and the second gear 290 is connected to the eccentric 211 to drive the eccentric 211 to rotate coaxially.

[0092] Please continue reading Figure 8 In some embodiments, the transmission assembly 200 includes a transmission member 240 and a first elastic member 230. The outer periphery of the transmission member 240 is provided with a first limiting portion 241. The first elastic member 230 is provided on the side of the first limiting portion 241 facing the pump liquid member 320 and is connected to the pump housing 310 and / or the first limiting portion 241.

[0093] When the liquid pump 10 is in the pumping stroke, the transmission member 240, driven by the driven shaft, moves toward the pumping member 320. Because the first elastic member 230 is disposed on the side of the first limiting portion 241 facing the pumping member 320, as the transmission member 240 moves, the distance between the first limiting portion 241 and the pump housing 310 opposite the first limiting portion 241 gradually decreases. The first elastic member 230, squeezed by the pump housing 310 and the first limiting portion 241, elastically deforms and develops elastic potential energy. Therefore, when the liquid pump 10 is in the suction stroke, the clutch can be switched to a disengaged state, and the first elastic member 230, after being squeezed and elastically deformed, tends to return to its initial state. After the driven shaft and the driving shaft are disconnected, the driven shaft can rotate freely relative to the driving shaft. Under the resistance of the first elastic member 230, the elastic potential energy of the first elastic member 230 is converted into kinetic energy of the transmission member 240, causing the transmission member 240 to move away from the pumping member 320, thereby driving the pumping member 320 in the opposite direction of the pumping. When the first elastic member 230 returns to its initial state, the pumping member 320 also moves to the starting position of the pumping stroke, indicating that the pumping member 320 has completed its pumping stroke.

[0094] By providing the clutch and first elastic member 230, the transmission assembly 200 can independently drive the pumping element 320 to complete the suction stroke when the power assembly 100 is disengaged. When the liquid pump 10 is in the suction stroke, the clutch is disengaged, allowing the motor to continue running to accumulate energy. This means the suction stroke can be considered an energy storage stroke. The motor can also be stopped to conserve energy.

[0095] Specifically, the first elastic member 230 includes, but is not limited to, a metal spring, a rubber spring, or other elastically deformable component. The first elastic member 230 may be directly connected to the pump housing 310 or the first stopper 241, or one end may be connected to the pump housing 310 and the other end to the first stopper 241. Alternatively, the first elastic member 230 may be directly sleeved around the outer periphery of the transmission member 240, with its ends abutting the pump housing 310 and the first stopper 241, respectively.

[0096] In some embodiments, the pump head assembly 300 also includes a reset member 340 that cooperates with the liquid pumping member 320. When the liquid pump 10 is in the liquid suction stroke, the power assembly 100, the transmission assembly 200 and the pump head assembly 300 are in a separated state, and the liquid pumping member 320 moves under the action of the reset member 340.

[0097] See also Figure 9 Specifically, in some embodiments, the reset member 340 includes a push rod 341 and a second elastic member 342, one end of the push rod 341 is connected to the pumping member 320, and the other end has a second limiting portion 3411, and is configured to move toward the pumping member 320 under the drive of the transmission assembly 200 to complete the pumping stroke; the second elastic member 342 is arranged on the side of the second limiting portion 3411 facing the pumping member 320, and is connected to the pump housing 310 and / or the second limiting portion 3411; the transmission assembly 200 includes a driving gear 250 and a pushing rack 260; the driving gear 250 is configured to rotate around the second direction Y under the drive of the power assembly 100; the pushing rack 260 is meshed and connected with the driving gear 250, and the pushing rack 260 moves along the first direction X toward or away from the push rod 341 under the drive of the driving gear 250; the first direction X is perpendicular to the second direction Y.

[0098] When the liquid pump 10 is in the pumping stroke, the driving gear 250 rotates around the second direction Y under the drive of the power assembly 100, and drives the push rack 260 to move along the first direction X toward the push rod 341; at this time, the push rack 260 abuts against the push rod 341, and the push rack 260 drives the push rod 341 to move synchronously in the first direction X, and then drives the pumping part 320 connected to the push rod 341 to move synchronously in the first direction X. The second elastic part 342 is elastically deformed and generates elastic potential energy under the extrusion of the pump housing 310 and the second limit portion 3411.

[0099] When the liquid pump 10 is in the liquid suction stroke, the driving gear 250 rotates about the second direction Y under the drive of the power assembly 100, and drives the push rack 260 to move along the first direction X away from the push rod 341; while pushing the rack 260 to separate from the push rod 341, under the resistance of the second elastic member 342, the elastic potential energy of the second elastic member 342 is converted into kinetic energy of the push rod 341, causing the push rod 341 to move in the direction away from the liquid pumping member 320, thereby driving the liquid pumping member 320 to move in the opposite direction of pumping liquid.

[0100] After the pumping element 320 completes the liquid suction stroke under the resistance of the second elastic member 342, the liquid pump 10 enters the energy storage stroke. In the first stage of the energy storage stroke, the push rack 260, driven by the driving gear 250, continues to move in the first direction X away from the push rod 341, so that a certain distance is maintained between the push rack 260 and the push rod 341. Then, the driving gear 250, driven by the power assembly 100, performs a steering motion, and the push rack 260, driven by the driving gear 250, moves in the first direction X toward the push rod 341. Before the push rack 260 again abuts the push rod 341, the transmission assembly 200 and the pump head assembly 300 are in a separated state. The push rack 260 does not drive the pumping element 320 to move, and is in an energy storage state.

[0101] By providing the push rod 341 and the second elastic member 342, the pump head assembly 300 can complete the liquid suction stroke by itself when the transmission assembly 200 and the pump head assembly 300 are separated. The speed at which the pumping element 320 completes the liquid suction stroke via the second elastic member 342 is much slower than the speed at which the pumping element 320 completes the liquid suction stroke via the transmission assembly 200 and the power assembly 100 after accumulating energy. In other words, the duration of the liquid suction stroke is much shorter than the duration of the liquid suction stroke. While increasing the flow rate and impact force of the pumped liquid, by extending the duration of the liquid suction stroke, the pumping frequency and water consumption rate are reduced.

[0102] Specifically, the second elastic member 342 includes, but is not limited to, a metal spring, a rubber spring, or other elastically deformable component. The second elastic member 342 may be directly connected to the pump housing 310 or the second stopper 3411, or one end may be connected to the pump housing 310 and the other end to the second stopper 3411. Alternatively, the second elastic member 342 may be directly sleeved around the outer periphery of the push rod 341, with its two ends respectively abutting the pump housing 310 and the second stopper 3411.

[0103] In some embodiments, the pumping component 320 includes but is not limited to a diaphragm, a piston, and the like.

[0104] See also Figure 5In some embodiments, the pumping member 320 is a diaphragm and includes a central portion 321, an elastic portion 322 and a fixed portion 323; the central portion 321 is connected to the transmission assembly 200; the elastic portion 322 is wrapped around the central portion 321, and the elastic portion 322 can be deformed when the transmission assembly 200 drives the central portion 321 to reciprocate; the fixed portion 323 is wrapped around the elastic portion 322, and the fixed portion 323 is connected to the pump housing 310.

[0105] By connecting the external fixing portion 323 to the pump housing 310, the pumping element 320 is fixedly connected to the pump housing 310, and together with the pump housing 310, a pump chamber 330 for containing liquid is formed. By connecting the elastic portion 322 to the central portion 321 and the fixing portion 323, the elastic portion 322 can adapt to the reciprocating motion of the central portion 321 through elastic deformation. By using the central portion 321 as the driving force point of the pumping element 320, when the transmission assembly 200 drives the central portion 321 along the first direction X toward or away from the corresponding inner wall of the pump housing 310 under the driving action of the power assembly 100, the elastic portion 322 can be caused to undergo elastic deformation (such as stretching or contraction), thereby adjusting the volume of the pump chamber 330. Specifically, the elastic portion 322's ability to undergo elastic deformation can be changed by adjusting its thickness; the elastic portion 322's ability to undergo elastic deformation can also be changed by changing its shape. For example, the elastic portion 322 can be configured to be arc-shaped, folded-shaped, or wavy-shaped.

[0106] It can be understood that at the end position of the pumping stroke, when the side of the pumping part 320 facing away from the transmission component 200 abuts against the inner wall of the pump housing 310, that is, the side of the center part 321 facing away from the transmission component 200 abuts against the inner wall of the pump housing 310, the center part 321 can be set to have a certain elastic force, so that when the side of the center part 321 facing away from the transmission component 200 collides with the pump housing 310, it avoids collision damage between the center part 321 and the pump housing 310, or generates loud noise.

[0107] Please continue reading Figure 2 、 Figure 5 and Figure 10 In some embodiments, the pump housing 310 includes a pump head 311 and a main body 312 that are connected to each other. The pump liquid part 320 is connected to the pump head 311 and encloses a pump cavity 330 with the pump head 311. The pump liquid part 320 and the main body 312 enclose an installation cavity 350, and the installation cavity 350 is used to accommodate the transmission assembly 200; the pump head 311 has a fixing groove 3111 surrounding the pump cavity 330 on the side facing the pump liquid part 320, and the fixing groove 3111 is used to accommodate the fixing part 323; the pump head assembly 300 also includes a pressure cover 360, which is arranged around the pump cavity 330, the pressure cover 360 is connected to the pump head 311, and the fixing part 323 is clamped between the pump head 311 and the pressure cover 360.

[0108] By configuring the pump housing 310 to include a pump head 311 and a main body 312, the pumping element 320 can form a pump chamber 330 and an installation chamber 350 with the pump head 311 and the main body 312, respectively. When the transmission assembly 200 is installed in the installation chamber 350, the entire liquid pump 10 can be compactly installed, facilitating the miniaturization of the liquid pump 10 and the oral care device 20 equipped with the liquid pump 10. By sandwiching the fixing portion 323 between the pump head 311 and the gland 360, the pumping element 320 is securely and sealedly mounted on the pump housing 310, preventing the pumping element 320 from falling off during the reciprocating motion of the central portion 321, or causing leakage of the liquid in the pump chamber 330.

[0109] Please refer to the figure. In some embodiments, the center portion 321 has a plug connector 3211 on the side facing away from the pump head 311. The transmission assembly 200 also includes a fixing frame 270 connected to the pump liquid part 320. The fixing frame 270 has a connecting cavity 271 on the side facing the pump liquid part 320. The plug connector 3211 is plugged into the connecting cavity 271, and the inner diameter of the opening of the connecting cavity 271 is smaller than the outer diameter of the plug connector 3211.

[0110] The fixed bracket 270 is provided to connect the pumping element 320, ensuring a secure connection between the pumping element 320 and the transmission assembly 200, allowing the transmission assembly 200 to drive the pumping element 320 to move synchronously. By setting the inner diameter of the opening of the connecting cavity 271 to be smaller than the outer diameter of the plug connector 3211, the plug connector 3211 is confined within the connecting cavity 271 and prevented from escaping from the fixed bracket 270.

[0111] See also Figure 11 and Figure 12 In some embodiments, the pump housing 310 also has an independent first flow channel 313 and a second flow channel 314, the first flow channel 313 is connected to the pump chamber 330 and has a liquid inlet 3131, and the second flow channel 314 is connected to the pump chamber 330 and has a liquid outlet 3141; the pump head assembly 300 also includes a first one-way valve 315 and a second one-way valve 316; the first one-way valve 315 is arranged in the first flow channel 313 and is configured to allow liquid to flow in one direction from the liquid inlet 3131 to the pump chamber 330; the second one-way valve 316 is arranged in the second flow channel 314 and is configured to allow liquid to flow in one direction from the pump chamber 330 to the liquid outlet 3141.

[0112] When the pumping element 320 performs a liquid suction stroke driven by the transmission assembly 200, the volume of the pump chamber 330 expands, a negative pressure is generated in the pump chamber 330, the first one-way valve 315 switches to an open state, the second one-way valve 316 switches to a closed state, and the liquid flows sequentially through the liquid inlet 3131, the first one-way valve 315, and the pump chamber 330. When the pumping element 320 performs a liquid pumping stroke driven by the transmission assembly 200, the volume of the pump chamber 330 decreases, a positive pressure is generated in the pump chamber 330, the first one-way valve 315 switches to a closed state, the second one-way valve 316 switches to an open state due to the positive pressure, and the liquid in the pump chamber 330 flows sequentially through the second one-way valve 316 and the liquid outlet 3141 before being ejected. The pressure change caused by the volume change in the pump chamber 330 is used to realize the automatic closing and opening of the first one-way valve 315 and the second one-way valve 316, thereby controlling the liquid to flow into the pump chamber 330 during the suction stroke and to flow out of the pump chamber 330 during the pumping stroke.

[0113] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0114] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A liquid pump for an oral care device, characterized in that: include: Powertrain and transmission components; as well as, A pump head assembly, the pump head assembly comprising a pump housing and a liquid pumping member, the liquid pumping member and the pump housing together forming a pump chamber for containing liquid, and the liquid pumping member being connected to the power assembly via the transmission assembly; Among them, within a single movement cycle of the liquid pump, the liquid pump includes a suction stroke, an energy storage stroke and a liquid pumping stroke. When the liquid pump is in the suction stroke, the pump chamber becomes larger, when the liquid pump is in the energy storage stroke, the pump chamber remains approximately unchanged, when the liquid pump is in the liquid pumping stroke, the pump chamber becomes smaller, and the energy storage stroke is before the liquid pumping stroke.

2. The liquid pump according to claim 1, wherein The suction stroke is after the pumping stroke, and / or the suction stroke is before the energy storage stroke.

3. The liquid pump according to claim 1 or 2, characterized in that: The suction stroke and the pumping stroke satisfy at least one of the following conditions: The average speed of the liquid suction stroke is less than the average speed of the liquid pumping stroke; The liquid pressure of the liquid suction stroke is less than the liquid pressure of the liquid pumping stroke; The duration of the liquid suction stroke is longer than the duration of the liquid pumping stroke.

4. The liquid pump according to claim 1 or 2, characterized in that: The power assembly rotates back and forth within a preset angle range.

5. The liquid pump according to claim 4, wherein The power assembly has a downtime period before the reversing movement.

6. The liquid pump according to claim 4, wherein: The pumping stroke is located at the end of the rotation stroke of the power component, and the suction stroke is located at the starting end of the rotation stroke of the power component.

7. The liquid pump according to claim 1, wherein When the liquid pump is in the energy storage stroke, the power assembly is in operation.

8. The liquid pump according to claim 7, characterized in that When the liquid pump is in the liquid suction stroke, the energy storage stroke and the liquid pumping stroke, the power assembly is in operation.

9. The liquid pump according to claim 1, wherein When the liquid pump is in the energy storage stroke, at least one of the power assembly, the transmission assembly and the pump head assembly is in a separated state, so that the pumping element does not move in conjunction with the power assembly when the power assembly is running; and / or, When the liquid pump is in the liquid pumping stroke, the power assembly, the transmission assembly and the pump head assembly are in a coordinated state, so as to link the liquid pumping component to move when the power assembly is running.

10. The liquid pump according to claim 9, wherein When the liquid pump is in the liquid suction stroke, the power assembly, the transmission assembly and the pump head assembly are in a coordinated state, so as to link the liquid pumping part to move when the power assembly is running; or The pump head assembly also includes a reset member that cooperates with the liquid pumping member. When the liquid pump is in the liquid suction stroke, the power assembly, the transmission assembly and the pump head assembly are in a separated state, and the liquid pumping member moves under the action of the reset member.

11. The liquid pump according to claim 9, wherein The transmission assembly includes an active member and a driven member, the active member is connected to the power assembly, and the driven member is connected to the pumping member. When the transmission assembly is in the pumping stroke, the active member and the driven member are in a mating state. When the transmission assembly is in the energy storage stroke, the active member and the driven member are in a separated state.

12. The liquid pump according to claim 9, characterized in that The power assembly includes a power member and a clutch member. The power member is connected to the transmission assembly through the clutch member. When the power assembly is in the pumping stroke, the clutch member is in a mating state. When the power assembly is in the energy storage stroke, the clutch member is in a disengaged state.

13. The liquid pump according to claim 11, wherein The driven member includes a connecting rod, which is extended along a first direction, one end of which is connected to the pumping member, and the other end of which has a shaft sleeve portion arranged in an annular shape; The active member includes an eccentric wheel, and the eccentric wheel is configured to rotate around a second direction in the sleeve portion under the drive of the power assembly; the first direction is perpendicular to the second direction; The connecting rod drives the pumping element to reciprocate in the first direction through the rotating eccentric wheel.

14. The liquid pump according to claim 13, wherein When the liquid pump is in the energy storage stroke, the eccentric wheel and the shaft sleeve part are loosely matched or loosely matched to rotate idly. When the liquid pump is in the liquid suction stroke and the liquid pumping stroke, the eccentric wheel and the shaft sleeve part are slidingly matched to drive the connecting rod to reciprocate in the first direction.

15. The liquid pump according to claim 14, wherein: The power assembly drives the eccentric wheel to reciprocate within a preset angle range, and the preset angle is less than 360°.

16. The liquid pump according to claim 14, wherein The inner wall surface of the sleeve portion includes a first propulsion surface and a first free surface, and the eccentric wheel has a second propulsion surface. When the liquid pump is in the energy storage stroke, the second propulsion surface and the first free surface have a clearance fit or a virtual fit. When the liquid pump is in the liquid suction stroke and the liquid pumping stroke, the second propulsion surface and the first propulsion surface have a sliding fit. When the liquid pump is in the energy storage stroke, when the eccentric wheel rotates the preset angle θ, the displacement of any point on the second propulsion surface in the first direction is a. When the liquid pump is in the liquid pumping stroke, when the eccentric wheel rotates the preset angle θ, the displacement of the same any point on the second propulsion surface in the first direction is b, and b is greater than a.

17. The liquid pump according to claim 16, wherein: The inner wall surface of the sleeve portion includes two first propulsion surfaces arranged on opposite sides of the rotation axis of the eccentric wheel, and the first free surface is located between the two first propulsion surfaces; within a single motion cycle, the rotation direction of the eccentric wheel remains unchanged.

18. The liquid pump according to claim 17, wherein: The inner wall surface of the sleeve portion also includes: The stop surface is arranged opposite to the first free surface and is smoothly connected to the two first propulsion surfaces respectively. When the second propulsion surface abuts the stop surface, the side of the pumping element facing away from the driven element abuts the inner wall of the pump housing.

19. The liquid pump according to claim 16, wherein On a radial cross section of the eccentric wheel, the projection of the rotation axis of the eccentric wheel is a first point, the projection of the rotation axis of the second propulsion surface is a second point, a first ray and a second ray are formed with the first point as an endpoint, the first ray passes through the second point, and the second ray extends in a direction away from the pumping component and is parallel to the first direction; Wherein, within the pumping stroke, the angle between the first ray and the second ray gradually changes from an acute angle to an obtuse angle.

20. The liquid pump according to claim 19, wherein At the end position of the pumping stroke, the angle formed by the first ray and the second ray is no greater than 160°.

21. The liquid pump according to claim 13, wherein During the pumping stroke, the rotation angle of the eccentric wheel is not less than 20° and not more than 60°.

22. The liquid pump according to claim 13, wherein The outer periphery of the shaft sleeve is provided with limiting ribs, and the limiting ribs at least abut against inner walls of the pump housing on two opposite sides along the first direction.

23. The liquid pump according to claim 12, wherein: The power part is a motor; the clutch part is a clutch, and the clutch has a driving shaft and a driven shaft, the driving shaft is connected to the output shaft of the motor, and the driven shaft is connected to the transmission assembly; the driving shaft and the driven shaft have a separated state of disconnecting the transmission, and a matched state of mutual transmission.

24. The liquid pump according to claim 23, wherein The transmission assembly includes a transmission member and a first elastic member. A first limiting portion is provided on the periphery of the transmission member. The first elastic member is provided on a side of the first limiting portion facing the pumping member and is connected to the pump housing and / or the first limiting portion.

25. The liquid pump according to claim 10, wherein The reset element comprises: a push rod, one end of which is connected to the pumping member, the other end of which has a second limiting portion, and is configured to move toward the pumping member under the drive of the transmission assembly to complete the pumping stroke; and a second elastic member, provided on a side of the second limiting portion facing the liquid pumping member and connected to the pump housing and / or the second limiting portion; The transmission assembly comprises: a driving gear configured to rotate in a second direction under the drive of the power assembly; and The pushing rack is meshed with the driving gear, and the pushing rack is driven by the driving gear to move toward or away from the push rod along a first direction; the first direction is perpendicular to the second direction.

26. The liquid pump according to claim 1, wherein The pump fluid component comprises: a central portion connected to the transmission assembly; an elastic portion, disposed around the central portion, wherein the elastic portion is capable of deforming when the transmission assembly drives the central portion to reciprocate; and The fixing portion is wound around the elastic portion and connected to the pump housing.

27. The liquid pump according to claim 26, wherein At the end position of the pumping stroke, the side of the central portion facing away from the transmission assembly abuts against the inner wall of the pump housing.

28. The liquid pump according to claim 26, wherein The pump housing includes a pump head and a main body connected to each other, the pump component is connected to the pump head and encloses the pump cavity with the pump head, and the pump component and the main body enclose an installation cavity, and the installation cavity is used to accommodate the transmission assembly; The pump head has a fixing groove surrounding the pump cavity on one side facing the pumping element, and the fixing groove is used to accommodate the fixing portion; The pump head assembly further includes a gland, which is arranged around the pump cavity and connected to the pump head. The fixing portion is clamped between the pump head and the gland.

29. The liquid pump according to claim 28, wherein The central portion has a plug connector on the side facing away from the pump head, and the transmission assembly also includes a fixing frame connected to the pump fluid component. The fixing frame has a connecting cavity on the side facing the pump fluid component, and the plug connector is plugged into the connecting cavity, and the inner diameter of the opening of the connecting cavity is smaller than the outer diameter of the plug connector.

30. The liquid pump according to claim 1, wherein The pump housing further has an independent first flow channel and a second flow channel, the first flow channel is connected to the pump chamber and has a liquid inlet, and the second flow channel is connected to the pump chamber and has a liquid outlet; The pump head assembly further comprises: a first one-way valve disposed in the first flow channel and configured to allow liquid to flow from the liquid inlet to the pump chamber in one direction; and The second one-way valve is disposed in the second flow channel and is configured to allow the liquid to flow from the pump chamber to the liquid outlet in one direction.

31. An oral care device, characterized in that include: The liquid pump according to any one of claims 1 to 30; as well as The liquid storage container and the nozzle are respectively communicated with the pump cavity of the liquid pump. The liquid pump is used to suck the liquid medium in the liquid storage container and pump it out to the nozzle.

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