Pump assembly and oral care device

Abstract

The utility model relates to a pump assembly and an oral care device. The pump assembly comprises a shell, a displacement mechanism and an eccentric mechanism. The displacement mechanism is provided with a diaphragm, and the side, facing the first direction, of the diaphragm and part of the inner wall of the shell define a pumping cavity. The diaphragm comprises a driven part which can be at least partially deformed under the action of external force, and an edge part which is positioned on the peripheral side of the driven part and is jointed with the shell; the eccentric mechanism drives the displacement mechanism to reciprocate towards the first direction and the second direction in the rotating process so as to circularly reduce and increase the volume of the pumping cavity; the displacement mechanism further comprises a push-pull piece in transmission connection with the eccentric mechanism, and the driven part of the diaphragm is coupled to the push-pull piece. The push-pull piece is driven by the eccentric mechanism to drive at least part of the driven part to deform; on the plane perpendicular to the displacement axis, the ratio of the projection area of the driven part capable of being driven to deform to the projection area of the driven part is within the range of 0.66-0.92.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of water pumps, in particular to a pump assembly, and further relates to an oral care device. BACKGROUND

[0002] In the prior art, pump assemblies are used in many devices to achieve the effect of fluid pulse. Specifically, the eccentric member in the pump assembly can drive the diaphragm to reciprocate under the driving action of the driving mechanism, thereby reciprocating to increase and decrease the volume of the pumping cavity, and then pumping out the pulse fluid.

[0003] In oral care devices such as oral irrigators, the above pump assembly can be used to achieve the water pumping function. However, oral irrigators have high requirements for fluid impact force, and fluid with insufficient impact force will result in poor flushing effect of the oral irrigator on the tooth gap. How to improve the water pumping impact force is a technical problem to be solved in the field. UTILITY MODEL CONTENT

[0004] The present disclosure provides a pump assembly and an oral care device to solve the problems in the prior art.

[0005] According to a first aspect of the present disclosure, a pump assembly is provided, comprising:

[0006] a housing, a pumping cavity being formed in the housing;

[0007] a displacement axis;

[0008] a displacement mechanism having a diaphragm, the diaphragm being configured to form the pumping cavity with part of the inner wall of the housing on one side of the displacement axis towards a first direction; the diaphragm comprising a driven part capable of at least partially deforming under external force, and an edge part located on the outer peripheral side of the driven part, the edge part being engaged with the housing;

[0009] an eccentric mechanism arranged in the housing and drivingly connected to one side of the displacement mechanism along the displacement axis towards a second direction, the second direction being opposite to the first direction; the eccentric mechanism being configured to rotate under the action of a driving mechanism and drive the displacement mechanism to reciprocate along the displacement axis towards the first direction and the second direction during rotation, so as to cyclically decrease and increase the volume of the pumping cavity;

[0010] The displacement mechanism further comprises a push-pull member in transmission connection with the eccentric mechanism, and the driven portion of the diaphragm is configured to be coupled to the push-pull member; the push-pull member is configured to drive at least part of the driven portion to deform under the driving of the eccentric mechanism; and the ratio of the projection area of the driven portion that can be driven to deform to the projection area of the driven portion is within the range of 0.66-0.92 in a plane perpendicular to the displacement axis.

[0011] In one embodiment of the present disclosure, the ratio of the projection area of the driven portion that can be driven to deform to the projection area of the driven portion is within the range of 0.7-0.91.

[0012] In one embodiment of the present disclosure, the ratio of the projection area of the driven portion that can be driven to deform to the projection area of the driven portion is within the range of 0.87-0.91.

[0013] In one embodiment of the present disclosure, the driven portion comprises an elastic portion that can be deformed, and a connecting member at least partially engaged with the inner circumferential side of the elastic portion and coupled to the push-pull member; and the outer circumferential side of the elastic portion is engaged with the edge portion.

[0014] In one embodiment of the present disclosure, the elastic portion is configured in a ring shape, and the ring width of the elastic portion is within the range of 2.2-5.4 mm.

[0015] In one embodiment of the present disclosure, the connecting member comprises a motion transmission end at least partially engaged with the inner circumferential side of the elastic portion, and a coupling end extending to the push-pull member in the second direction.

[0016] In one embodiment of the present disclosure, in the second direction, the diameter of the motion transmission end remains unchanged, and the extension length of the motion transmission end is not less than the elastic portion in the state that the elastic portion is not deformed; and / or,

[0017] the motion transmission end is configured in a circular shape; and / or,

[0018] the diameter of the motion transmission end is within the range of 3-7 mm; and / or,

[0019] the coupling end comprises a transmission member connected with the motion transmission end and gradually expanded radially at least in the second direction.

[0020] In one embodiment of the present disclosure, the coupling end comprises a transmission member connected with the motion transmission end and gradually expanded radially at least in the second direction, and the outer wall of the transmission member is configured in an arc structure.

[0021] In one embodiment of the present disclosure, the ratio of the projected area of the motion transmission end to the area of the elastic portion in a plane perpendicular to the displacement axis is in the range of 0.09-0.37; and / or, the ratio of the projected area of the motion transmission end to the area of the driven portion in a plane perpendicular to the displacement axis is in the range of 0.08-0.28.

[0022] In one embodiment of the present disclosure, the ratio of the projected area of the motion transmission end to the area of the elastic portion in a plane perpendicular to the displacement axis is in the range of 0.1-0.14; and / or, the ratio of the projected area of the motion transmission end to the area of the driven portion in a plane perpendicular to the displacement axis is in the range of 0.09-0.12.

[0023] In one embodiment of the present disclosure, the displacement axis is configured to pass through the center of the motion transmission end, and / or, the center of the motion transmission end, the center of the diaphragm and the center of the elastic portion coincide.

[0024] In one embodiment of the present disclosure, the projected area of the motion transmission end in a plane perpendicular to the displacement axis is 12.5-28.5mm 2 .

[0025] In one embodiment of the present disclosure, the displacement axis is configured to pass through the center of the diaphragm, and / or, the displacement axis coincides with the central axis of the push-pull piece, and / or, the displacement axis is configured to pass through the center of the elastic portion.

[0026] In one embodiment of the present disclosure, the projection of the elastic portion in a plane perpendicular to the displacement axis is at least partially located on the outer peripheral side of the connecting piece; and / or, the projection of the elastic portion is at least partially located on the outer peripheral side of the push-pull piece.

[0027] In one embodiment of the present disclosure, based on the push-pull piece, the displacement mechanism with the diaphragm is formed by two-shot injection molding.

[0028] In one embodiment of the present disclosure, the diameter of the push-pull piece is in the range of 1.2-1.8mm.

[0029] In one embodiment of the present disclosure, the housing is provided with a liquid inlet flow channel and a liquid outlet flow channel which communicate with the pumping cavity; liquid from the liquid inlet flow channel is configured to flow into the pumping cavity, and is configured to flow out through the liquid outlet flow channel under the extrusion of the diaphragm during the movement of the displacement mechanism towards the first direction.

[0030] In one embodiment of the present disclosure, the housing comprises a valve plate, the valve plate and the diaphragm enclosing the pumping cavity; the valve plate is provided with a liquid inlet hole in communication with the liquid inlet channel and a liquid outlet hole in communication with the liquid outlet channel.

[0031] In one embodiment of the present disclosure, the housing further comprises a cylinder body fixedly connected with the valve plate, and the edge portion is configured to be clamped between the cylinder body and the valve plate.

[0032] In one embodiment of the present disclosure, on the side of the valve plate away from the diaphragm, a first one-way valve in communication with the liquid inlet channel is arranged at a position corresponding to the liquid inlet hole, and a second one-way valve in communication with the liquid outlet channel is arranged at a position corresponding to the liquid outlet hole.

[0033] In one embodiment of the present disclosure, the diameter of the liquid outlet hole is greater than or equal to the diameter of the liquid inlet hole; the diameter of the liquid inlet hole is in the range of 1.5-3 mm, and / or the diameter of the liquid outlet hole is in the range of 1.5-3 mm.

[0034] In one embodiment of the present disclosure, the displacement mechanism can be driven by the eccentric mechanism to move along the displacement axis towards the first direction to a compression position and to move along the displacement axis towards the second direction to an expansion position; the wall surface of the valve plate towards the second direction is configured to be adapted to the shape of the diaphragm in the compression position.

[0035] In one embodiment of the present disclosure, the driven portion comprises an elastic portion capable of deformation, and in the compression position, the elastic portion of the diaphragm is configured to form a curved surface with an opening towards the second direction; the area of the wall surface of the valve plate towards the second direction adapted to the elastic portion is configured as an arc surface.

[0036] In one embodiment of the present disclosure, the liquid inlet hole and / or the liquid outlet hole are arranged on the arc surface.

[0037] In one embodiment of the present disclosure, the driven portion comprises an elastic portion capable of deformation, and a connecting piece at least partially engaged with the inner circumferential side of the elastic portion and coupled to the push-pull piece; the end surface of the connecting piece towards the first direction is configured as a plane; the wall surface area of the valve plate corresponding to the end surface towards the second direction is configured as a plane.

[0038] In one embodiment of the present disclosure, the displacement mechanism can be driven by the eccentric mechanism to move along the displacement axis towards the first direction to a compression position and to move along the displacement axis towards the second direction to an expansion position; in the expansion position, at least part of the diaphragm is configured to form a curved surface with an opening towards the first direction.

[0039] In one embodiment of the present disclosure, when the displacement mechanism is located at a relaxed position between the compression position and the expansion position, the driven part is substantially not deformed; the distance between the expansion position and the relaxed position along the displacement axis is 0.2-1.5mm.

[0040] In one embodiment of the present disclosure, the distance between the expansion position and the relaxed position along the displacement axis is 0.4-1.2mm.

[0041] In one embodiment of the present disclosure, the displacement mechanism can be driven by the eccentric mechanism to move along the displacement axis to a compression position in the first direction, and to move along the displacement axis to an expansion position in the second direction; when located at the expansion position, the volume of the pumping cavity is in the range of 80-300mm 3 .

[0042] In one embodiment of the present disclosure, when located at the expansion position, the volume of the pumping cavity is in the range of 100-250mm 3 .

[0043] In one embodiment of the present disclosure, the eccentric mechanism is an eccentric wheel, which is configured to have a rotation axis deviating from its geometric center; wherein the eccentricity of the eccentric wheel is in the range of 0.5-1.2mm.

[0044] In one embodiment of the present disclosure, the eccentricity of the eccentric wheel is in the range of 0.8-1.2mm.

[0045] According to a second aspect of the present disclosure, there is also provided an oral care device, comprising:

[0046] a holding part, one end of the holding part being connected with a nozzle;

[0047] a liquid storage tank arranged in the holding part;

[0048] a pump assembly according to the first aspect of the present disclosure arranged in the holding part; a liquid inlet flow channel and a liquid outlet flow channel are arranged on the housing of the pump assembly and communicate with the pumping cavity, the liquid storage tank communicates with the liquid inlet flow channel, and the nozzle communicates with the liquid outlet flow channel; during rotation of the eccentric mechanism, the volume of the pumping cavity periodically increases and decreases, so that the liquid in the liquid storage tank is pumped into the pumping cavity through the liquid inlet flow channel, and impact fluid is provided through the liquid outlet flow channel.

[0049] According to a third aspect of the present disclosure, there is also provided an oral care device, comprising:

[0050] A holding portion, one end of the holding portion is connected with a nozzle and a brush head;

[0051] A liquid storage tank is arranged in the holding portion;

[0052] A brush head driving mechanism is configured to drive the brush head to swing;

[0053] According to the first aspect of the present disclosure, the pump assembly is arranged in the holding portion; a housing of the pump assembly is provided with an inlet flow channel and an outlet flow channel in communication with the pumping cavity; the liquid storage tank is in communication with the inlet flow channel, and the nozzle is in communication with the outlet flow channel; during rotation of the eccentric mechanism, the volume of the pumping cavity periodically increases and decreases, so that the liquid in the liquid storage tank is pumped into the pumping cavity through the inlet flow channel, and impact fluid is provided through the outlet flow channel.

[0054] In one embodiment of the present disclosure, the housing of the pump assembly includes a valve plate, and the valve plate and the diaphragm enclose the pumping cavity; the valve plate is provided with an inlet hole in communication with the inlet flow channel and an outlet hole in communication with the outlet flow channel; and the brush head driving mechanism is arranged on an extension of the valve plate.

[0055] One beneficial effect of the present disclosure is that by limiting the ratio of the projection area of the driven part that can be driven to change to the projection area of the driven part to the range of 0.66-0.92, the water impact force of the pump assembly can be significantly improved. Specifically, the eccentric mechanism can drive the push-pull piece to drive the part of the diaphragm to deform, and the larger deformable area makes the diaphragm have a larger deformation amplitude and force when it is pressed to extrude the liquid in the pumping cavity in the first direction. In this way, the liquid obtains greater flow rate and kinetic energy in a short time, thereby forming a stronger water impact force. In the application scenario of, for example, oral care equipment, the stronger impact force can more efficiently clean dirt in the interdental space, gingival groove and other parts, effectively improving the cleaning effect and user experience.

[0056] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0057] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0058] Figure 1 is a cross-sectional view of the pump assembly provided by an embodiment of the present disclosure when it is loosened;

[0059] Figure 2 is Figure 1Partial enlarged view of the middle cylinder body position;

[0060] Figure 3 is a cross-sectional view of the pump assembly in an expanded position according to an embodiment of the present disclosure;

[0061] Figure 4 is Figure 3 Partial enlarged view of the middle displacement mechanism position;

[0062] Figure 5 is a side view of the displacement mechanism according to an embodiment of the present disclosure;

[0063] Figure 6 is a top view of the displacement mechanism according to an embodiment of the present disclosure;

[0064] Figure 7 is an exploded view of the displacement mechanism according to an embodiment of the present disclosure;

[0065] Figure 8 is a structural schematic view of the pump assembly according to an embodiment of the present disclosure;

[0066] Figure 9 is a structural schematic view of the valve plate according to an embodiment of the present disclosure;

[0067] Figure 10 is a cross-sectional view of the valve plate according to an embodiment of the present disclosure;

[0068] Figure 11 is a structural schematic view of the oral care device according to an embodiment of the present disclosure;

[0069] Figure 12 is a structural schematic view of the oral care device according to another embodiment of the present disclosure.

[0070] Figures 1 to 12 A one-to-one correspondence between the names of the components and the reference numerals in the middle is as follows:

[0071] 100, pump assembly; 1, housing; 10, pumping cavity; 11, valve plate; 111, liquid inlet hole; 112, liquid outlet hole; 113, flat surface; 114, arc surface; 12, cylinder body; 2, displacement mechanism; 21, diaphragm; 211, driven part; 212, edge part; 213, elastic part; 214, connecting piece; 2141, motion transmission end; 2142, coupling end; 215, transmission piece; 22, push-pull piece; 3, eccentric mechanism; 4, driving mechanism; 41, driving shaft; 5, connecting rod; 6, bearing; 7, liquid inlet flow channel; 70, first one-way valve; 8, liquid outlet flow channel; 80, second one-way valve; 200, holding part; 300, liquid storage tank; 400, nozzle; 500, brush head; 600, brush head driving mechanism. DETAILED DESCRIPTION

[0072] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement, numerical expressions, and numerical values of components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless otherwise specifically stated.

[0073] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the present disclosure and its applications or uses.

[0074] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0075] Note that like reference numerals and characters designate like elements throughout the drawings, and thus, once an element is defined in one drawing, it is not necessary to discuss it further in subsequent drawings.

[0076] In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used to describe relative positions between the relevant parts, and are not intended to limit the absolute positions of the relevant parts.

[0077] In this document, "first", "second", and the like are used to distinguish between the relevant parts from each other, and are not intended to indicate the importance and order, and the premise of each other.

[0078] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include the errors allowed by those skilled in the art in manufacturing or use.

[0079] Embodiment One

[0080] With reference to Figure 1 and Figure 3 , the present embodiment provides a pump assembly 100, in particular, the pump assembly 100 can be a diaphragm pump which can be widely used in various industrial fields to transport fluid media. The pump assembly 100 comprises a housing 1, a displacement axis X, a displacement mechanism 2 and an eccentric mechanism 3. As shown in Figure 1 , the housing 1 is used to mount and accommodate various structures and components of the pump assembly 100, and a pumping cavity 10 is formed in the housing 1. In one embodiment of the present disclosure, the housing 1 comprises a valve plate 11 which can be formed as part of the structure of the housing 1 and integrally formed with the housing 1, or can be a part fixedly mounted on the housing 1.

[0081] With reference to Figure 1 the view direction, the horizontal dashed line in the figure is the displacement axis X, and the right side indicated by the arrow is referred to as the first direction X1 and the left side is referred to as the second direction X2. With reference to Figures 1 to 4The displacement mechanism 2 is engaged with the housing 1. The displacement mechanism 2 has a diaphragm 21. The side of the diaphragm 21 facing the first direction X1 along the displacement axis X is configured to enclose a portion of the inner wall of the housing 1 to form a pumping chamber 10. Specifically, the valve plate 11 and the diaphragm 21 enclose the pumping chamber 10. The volume of the pumping chamber 10 can change during the movement of the displacement mechanism 2, thereby enabling the liquid in the pumping chamber 10 to be pumped out.

[0082] In one embodiment of this disclosure, reference is made to Figure 5 The housing 1 has an inlet channel 7 and an outlet channel 8 communicating with the pumping chamber 10. Liquid from the inlet channel 7 is configured to flow into the pumping chamber 10 and, during the movement of the displacement mechanism 2 in the first direction X1, to flow out through the outlet channel 8 under the squeezing action of the diaphragm 21. When the displacement mechanism 2 moves, the volume of the pumping chamber 10 changes, thereby causing a change in the pressure inside the pumping chamber 10. This allows the fluid to be pumped out from the outlet channel 8 using pressure.

[0083] refer to Figure 2 , Figures 5 to 7 The diaphragm 21 includes a driven portion 211 capable of at least partially deforming under external force, and an edge portion 212 located on the outer periphery of the driven portion 211, the edge portion 212 being engaged with the housing 1. Specifically, the driven portion 211 and the edge portion 212 can be integrally formed to constitute the diaphragm 21. The driven portion 211 of the diaphragm 21 is capable of moving relative to the housing 1 under external force, and the edge portion 212 is used for fixed connection with the housing 1.

[0084] In one embodiment of this disclosure, such as Figure 2 As shown, the housing 1 also includes a cylinder 12 fixedly connected to the valve plate 11, with an edge portion 212 configured to be clamped between the cylinder 12 and the valve plate 11. The edge portion 212 is pressed down by the cylinder 12 and the valve plate 11, and will not move during the movement of the driven part 211. This arrangement provides waterproofing and sealing, preventing liquid in the pumping chamber 10 from leaking from the junction of the diaphragm 21 and the housing 1, thus avoiding water ingress into the housing 1 outside the pumping chamber 10 and preventing damage to structures such as the motor.

[0085] An eccentric mechanism 3 is disposed within the housing 1 and is drively connected to the displacement mechanism 2 along the displacement axis toward the side facing the second direction X2, which is opposite to the first direction X1. The eccentric mechanism 3 is configured to rotate under the action of the drive mechanism 4, and during rotation, it drives the displacement mechanism 2 to reciprocate along the displacement axis toward the first direction X1 and the second direction X2, thereby cyclically decreasing and increasing the volume of the pumping chamber 10. In one embodiment of this disclosure, the eccentric mechanism 3 is an eccentric wheel, which is configured to have a rotation axis Z offset from its geometric center.

[0086] In one embodiment of the present disclosure, the eccentricity of the eccentric wheel is in the range of 0.5-1.2mm. Further preferably, the eccentricity of the eccentric wheel is in the range of 0.8-1.2mm. The eccentricity of the eccentric wheel of the present disclosure is smaller than that of the prior art, thereby making the pump assembly 100 have a stronger throttling effect. Specifically, compared with the conventional eccentric wheel driving scheme of the prior art with a larger eccentricity, the present disclosure limits the eccentricity of the eccentric wheel to be in the range of 0.5-1.2mm (preferably 0.8-1.2mm), which significantly reduces the reciprocating stroke of the displacement mechanism 2 driven by the eccentric wheel during rotation, thereby directly reducing the amplitude of the volume change of the pumping cavity 10. The smaller eccentricity strictly controls the displacement of the diaphragm 21, reduces the volume change rate of the pumping cavity 10, and thereby effectively suppresses the liquid flow output per unit time, achieving the effect of water saving by throttling.

[0087] The driving mechanism 4 is coupled to the housing 1 and in transmission connection with the eccentric mechanism 3 to drive the eccentric mechanism 3 to rotate. The driving mechanism 4 can be an electric motor, such as Figure 1 As shown, the driving mechanism 4 includes a driving shaft 41 extending along the rotation axis Z, and the driving shaft 41 can be provided with knurling to better fasten the eccentric mechanism 3. The eccentric wheel can be provided with a shaft hole offset from the geometric center thereof, and the rotation center line of the eccentric wheel is the central axis of the shaft hole, that is Figure 1 the rotation axis Z marked in the figure. As shown, Figure 1 the driving shaft 41 penetrates the shaft hole, and when the driving mechanism 4 works, the driving shaft 41 can drive the eccentric wheel to rotate around the rotation axis Z.

[0088] In one embodiment of the present disclosure, referring to Figure 1 the housing 1 is further provided with a connecting rod 5 in transmission connection between the displacement mechanism 2 and the eccentric mechanism 3, and the connecting rod 5 is driven by the eccentric mechanism 3 to drive the displacement mechanism 2 to reciprocate along the first direction X1 and the second direction X2. One end of the connecting rod 5 can be in transmission connection with the eccentric mechanism 3, and when the eccentric mechanism 3 rotates, it can drive the connecting rod 5 to reciprocate along the first direction X1 and the second direction X2. The other end of the connecting rod 5 extends towards the displacement mechanism 2 and is connected to the end surface of the displacement mechanism 2 facing the second direction X2. During the reciprocating movement of the connecting rod 5, it can drive the displacement mechanism 2 to periodically increase and decrease the volume of the pumping cavity 10 with the same stroke as the connecting rod 5.

[0089] In one embodiment of the present disclosure, as shown in Figure 1As shown, the housing 1 is further provided with a bearing 6, which is sleeved on the eccentric mechanism 3. The bearing 6 is arranged between the eccentric mechanism 3 and the connecting rod 5, thereby reducing the friction between the eccentric mechanism 3 and the connecting rod 5. The bearing 6 avoids the eccentric mechanism 3 from rotating coaxially with the connecting rod 5, and ensures that the connecting rod 5 can move periodically along the displacement axis X.

[0090] Reference Figure 2 、 Figures 5 to 7 The displacement mechanism 2 further includes a push-pull piece 22 in driving connection with the eccentric mechanism 3, and the driven part 211 of the diaphragm 21 is configured to be coupled to the push-pull piece 22. The push-pull piece 22 is configured to be driven by the eccentric mechanism 3 to cause at least part of the driven part 211 to deform. Specifically, the push-pull piece 22 can be a screw coupled to the diaphragm 21. During rotation of the eccentric mechanism 3, the push-pull piece 22 is configured to reciprocate along the first direction X1 and the second direction X2, thereby driving the driven part 211 to move together. During the movement, part of the structure in the driven part 211 can be driven to deform, thereby achieving periodic increase and decrease of the volume of the pumping cavity 10.

[0091] In one specific embodiment of the present disclosure, the displacement mechanism 2 with the diaphragm 21 is formed by secondary injection molding based on the push-pull piece 22. The secondary injection molding process can integrally form the diaphragm 21 and the push-pull piece 22, thereby reducing the part splicing step in the traditional assembly process and improving production efficiency. At the same time, the integrally formed structure avoids the risk of leakage caused by the connection gap between parts, enhances the sealing performance and structural stability of the displacement mechanism 2, and ensures the reliability of the pump assembly 100 under long-term reciprocating motion conditions. The integrally formed structure can also achieve precise mechanical transmission between the diaphragm 21 and the push-pull piece 22, ensure efficient conversion of the movement of the eccentric mechanism 3 into deformation of the diaphragm 21, and thereby improve the pumping performance and working stability of the pump assembly 100.

[0092] In one embodiment of the present disclosure, referring to Figure 6 and Figure 7 The driven part 211 includes an elastic part 213 that can deform, and a connecting piece 214 at least partially engaged with the inner circumferential side of the elastic part 213 and coupled to the push-pull piece 22, and the outer circumferential side of the elastic part 213 is engaged with the edge part 212. Specifically, as shown in Figure 6 The elastic part 213 is configured in an annular shape, and the annular width of the elastic part 213 is in the range of 2.2-5.4 mm. In Figure 6In the perspective view, the displacement mechanism 2 can be in a concentric circle configuration, and the rings from inside to outside are: the push-pull piece 22, the connecting piece 214, the elastic part 213, and the edge part 212. One end of the push-pull piece 22 towards the second direction X2 can be fixedly connected to the connecting rod 5, and one end thereof towards the first direction X1 can be connected with the connecting piece 214 of the diaphragm 21, and thus drive the elastic part 213 to deform. In addition, the limitation of the ring width of the elastic part 213 in the embodiment ensures that the diaphragm 21 can produce sufficient deformation when moving, thereby maintaining good water impact force.

[0093] In one embodiment of the present disclosure, the displacement axis X is configured to pass through the center of the diaphragm 21, and / or the displacement axis X coincides with the center axis of the push-pull piece 22, and / or the displacement axis X is configured to pass through the center of the elastic part 213. The push-pull piece 22 can be arranged at the center position of the diaphragm 21, thereby ensuring that the diaphragm 21 is uniformly and symmetrically stressed during reciprocating motion, avoiding local stress concentration of the diaphragm 21 caused by eccentric load due to axis offset. This coaxial structure enables the driving force of the push-pull piece 22 to act vertically on the center of the diaphragm 21 along the displacement axis X, prompting the diaphragm 21 to symmetrically deform around the displacement axis X during reciprocating motion along the first direction X1 and the second direction X2, significantly improving the consistency and controllability of the deformation of the diaphragm 21, thereby reducing material fatigue loss caused by uneven deformation and prolonging the service life of the displacement mechanism 2.

[0094] In one embodiment of the present disclosure, in a plane perpendicular to the displacement axis X, the projection of the elastic part 213 is at least partially located on the outer circumferential side of the connecting piece 214; and / or the projection of the elastic part 213 is at least partially located on the outer circumferential side of the push-pull piece 22. When the push-pull piece 22 drives the diaphragm 21 to move through the connecting piece 214, the elastic part 213 on the outer circumferential side can provide balanced elastic support in the radial direction, so that the diaphragm 21 forms a deformation mode of central driving and outer circumferential cooperation. The structure of the displacement mechanism 2 of the present disclosure enhances the pre-tensioning stiffness of the diaphragm 21 in the expanded position, and in addition, through the energy storage effect of the outer circumferential elastic part 213, the diaphragm 21 can produce stronger rebound force during compression, thereby pushing the liquid in the pumping cavity 10 to be discharged at a higher instantaneous speed, improving the impact force of the fluid.

[0095] In one embodiment of the present disclosure, the diameter of the push-pull piece 22 is in the range of 1.2-1.8 mm. For example, when the push-pull piece 22 is a screw, if the diameter is too small, it is prone to breakage during the reciprocating movement of the displacement mechanism 2 driven by the eccentric mechanism 3, affecting the normal operation of the pump assembly 100; while if the diameter is too large, it needs to be coupled with a larger size connecting piece 214, which will occupy too much area of the driven part 211, resulting in a reduction in the area of the elastic part 213, weakening the deformation ability of the diaphragm 21 and reducing the water impact force. The diameter range defined in this embodiment can not only ensure that the push-pull piece 22 has sufficient strength to effectively resist stress during movement and avoid the risk of breakage, but also make the size of the connecting piece 214 reasonable, ensuring that the elastic part of the driven part 211 has sufficient area, and ensuring that the diaphragm 21 can deform sufficiently during movement to maintain good water impact force.

[0096] In a plane perpendicular to the displacement axis X, the ratio of the projection area of the deformed part of the driven part 211 to the projection area of the driven part 211 is in the range of 0.66-0.92, preferably in the range of 0.7-0.91, and further preferably in the range of 0.87-0.91. By limiting the ratio of the projection area of the deformed part (i.e. the elastic part 213) of the driven part 211 to the projection area of the driven part 211, the present disclosure can significantly improve the water impact force of the pump assembly 100. Specifically, the eccentric mechanism 3 can drive the push-pull piece 22 to deform the elastic part 213 of the diaphragm 21, and the larger deformable area enables the diaphragm 21 to have a larger deformation amplitude and force when moving towards the first direction X1 to press the liquid in the pumping cavity 10. This enables the liquid to obtain a larger flow rate and kinetic energy in a short time, thereby forming a stronger water impact force. In the application scenario of, for example, an oral care device, the stronger impact force can more efficiently clean dirt in the interdental space, gingival groove and other parts, effectively improving the cleaning effect and user experience.

[0097] In one embodiment of the present disclosure, referring to Figure 5 and Figure 7 , the connecting piece 214 includes a movement transmission end 2141 at least partially engaged with the inner circumferential side of the elastic part 213, and a coupling end 2142 extending along the second direction to be coupled with the push-pull piece 22. Wherein, the displacement axis X is configured to pass through the center of the movement transmission end 2141, and / or the center of the movement transmission end 2141, the center of the diaphragm 21 and the center of the elastic part 213 coincide. As Figure 5As shown, the connecting piece 214 can extend along the displacement axis X, one end of which close to the first direction X1 is marked as the motion transmission end 2141, and the other end close to the second direction X2 is marked as the coupling end 2142. When the eccentric mechanism 3 drives the push-pull piece 22 to reciprocate, the force applied by the push-pull piece 22 is conducted to the motion transmission end 2141 by the coupling end 2142, thereby driving the elastic part 213 to deform.

[0098] In one specific embodiment of the present disclosure, along the second direction X2, the diameter of the motion transmission end 2141 remains unchanged, and in the state where the elastic part 213 does not deform, the extension length of the motion transmission end 2141 is not less than the elastic part 213. Thus, the stability and continuity of force transmission are ensured, and stress concentration caused by sudden change in size of the motion transmission end 2141 is avoided.

[0099] In one specific embodiment of the present disclosure, the motion transmission end 2141 is configured in a circular shape, and / or the diameter of the motion transmission end 2141 is in the range of 3-7 mm. The circular motion transmission end 2141 can uniformly engage with the inner circumferential side of the elastic part 213, so that the elastic part 213 can uniformly disperse the acting force when deformed, avoiding abnormal deformation or damage caused by excessive local stress, and ensuring that the diaphragm 21 stably and efficiently deforms during operation. In addition, the diameter of the motion transmission end 2141 is in the range of 3-7 mm, and / or the projection area of the motion transmission end 2141 in the plane perpendicular to the displacement axis X is 12.5-28.5 mm 2 , so that the motion transmission end 2141 can stably combine with the elastic part 213, and will not excessively occupy the space of the driven part 211.

[0100] In one specific embodiment of the present disclosure, the coupling end 2142 includes a transmission member 215 connected with the motion transmission end 2141 and gradually expanding at least partially in the radial direction of the second direction. The gradually expanding design of the transmission member 215 of the coupling end 2142 optimizes the force transmission path, ensuring that the motion of the push-pull piece 22 can uniformly drive the elastic part 213 to deform. Further, as shown in Figure 2 and Figure 7 , the outer wall of the transmission member 215 is configured in an arc-shaped structure, which can avoid stress concentration when the diaphragm 21 deforms, so that the diaphragm 21 is not easy to tear during reciprocating pulling, thereby prolonging the service life of the diaphragm 21.

[0101] In one specific embodiment of the present disclosure, the ratio of the projected area of the motion transmission end 2141 to the area of the elastic portion 213 in a plane perpendicular to the displacement axis X is in the range of 0.09-0.37, preferably, the area ratio is in the range of 0.1-0.14; and / or, the ratio of the projected area of the motion transmission end 2141 to the area of the driven portion 211 in a plane perpendicular to the displacement axis X is in the range of 0.08-0.28, preferably, the area ratio is in the range of 0.09-0.12. The present disclosure precisely limits the area ratio of the motion transmission end 2141 to the elastic portion 213 and the driven portion 211, thereby ensuring that the motion transmission end 2141 can firmly transmit power while leaving sufficient deformation space for the elastic portion 213, avoiding the limitation of the deformation of the elastic portion 213 due to the excessive area of the motion transmission end 2141, thereby ensuring that the diaphragm 21 has good elastic recovery capability and deformation effect, and improving the liquid pumping efficiency and water impact force.

[0102] In one embodiment of the present disclosure, the displacement mechanism 2 can be driven by the eccentric mechanism 3 to move along the displacement axis X towards the first direction X1 to the compression position, and move along the displacement axis X towards the second direction X2 to the expansion position. Specifically, when the eccentric mechanism 3 drives the displacement mechanism 2 to move towards the first direction X1, the volume of the pumping cavity 10 decreases, and when the volume decreases to the limit position, the displacement mechanism 2 is in the compression position; when the eccentric mechanism 3 drives the displacement mechanism 2 to move towards the second direction X2, the volume of the pumping cavity 10 increases, and when the volume increases to the limit position, the displacement mechanism 2 is in the expansion position. The volume of the pumping cavity 10 changes periodically with the rotation of the eccentric mechanism 3, and in the process of the displacement mechanism 2 moving towards the first direction X1, the diaphragm 21 exerts a squeezing action on the liquid in the pumping cavity 10, thereby enabling the fluid with a certain impact to be pumped out of the liquid outlet flow channel 8.

[0103] In one specific embodiment of the present disclosure, when the displacement mechanism 2 is in the expansion position, the volume of the pumping cavity 10 is in the range of 80-300mm 3 , and further preferably, the volume of the pumping cavity 10 is in the range of 100-250mm 3 . The volume of the pumping cavity 10 of the present disclosure is smaller than that of the prior art, thereby enabling the pump assembly 100 to have stronger throttling effect, and enabling the size of the pump assembly 100 to be reduced as a whole, and thus can be applied to micro devices. In addition, as described above, the present disclosure also reduces the eccentricity of the eccentric wheel, thereby reducing the amplitude of the volume change of the pumping cavity 10, and thus can adaptively reduce the volume of the pumping cavity 10, thereby improving the effect of throttling and water saving.

[0104] The pump assembly 100 of the present disclosure is particularly suitable for scenarios where the amount of liquid used is sensitive, such as in oral care devices. Precise control of the output of impact fluid can meet the impact force required for cleaning while avoiding the excessive water consumption caused by traditional high-flow designs, which require multiple water refills for a single cleaning. The present disclosure reduces the eccentricity and the volume of the pumping chamber 10, which in turn reduces the amplitude of the displacement mechanism 2 and optimizes the proportion of the elastic portion 213 of the diaphragm 21 to the efficient range, thereby ensuring that the pumping chamber 10 can generate sufficient instantaneous pressure to form impact fluid during the compression phase, and limiting the maximum volume change to control the volume of liquid pumped in a single stroke within a reasonable range. Compared with the prior art, the pump assembly 100 of the present disclosure can effectively reduce the water consumption per unit time, and through the optimized matching of the pre-tensioning of the diaphragm 21, ensure that the instantaneous speed and impact force of the impact fluid meet the use requirements, avoiding the decline in cleaning effect caused by throttling.

[0105] In one embodiment of the present disclosure, referring to Figure 8 and Figure 9 , the valve plate 11 is provided with a liquid inlet hole 111 and a liquid outlet hole 112, which are separated and communicate with the liquid inlet channel 7 and the liquid outlet channel 8, respectively. On the side of the valve plate 11 away from the diaphragm 21, a first one-way valve 70 corresponding to the liquid inlet hole 111 is arranged to communicate with the liquid inlet channel 7, and a second one-way valve 80 corresponding to the liquid outlet hole 112 is arranged to communicate with the liquid outlet channel 8. The first one-way valve 70 and the second one-way valve 80 can ensure the correct flow direction of the liquid and prevent backflow. Specifically, the liquid from the liquid inlet channel 7 flows into the pumping chamber 10 through the liquid inlet hole 111 and the first one-way valve 70, and under the impact of the extrusion of the diaphragm 21, the liquid in the pumping chamber 10 flows out through the liquid outlet hole 112, the second one-way valve 80, and the liquid outlet channel 8.

[0106] In one embodiment of the present disclosure, the diameter of the liquid outlet hole 112 is greater than or equal to the diameter of the liquid inlet hole 111; the diameter of the liquid inlet hole 111 is in the range of 1.5-3 mm, and / or the diameter of the liquid outlet hole 112 is in the range of 1.5-3 mm. The present disclosure limits the diameter parameters and proportional relationship of the liquid inlet hole 111 and the liquid outlet hole 112 to achieve optimal matching of the fluid passage of the pump assembly 100. Specifically, the pump assembly 100 of the present disclosure uses a small eccentricity and a small size of the pumping chamber 10, which effectively reduces the water consumption per unit time. The diameters of the liquid inlet hole 111 and the liquid outlet hole 112 are matched and coordinated with the water-saving design, thereby ensuring the output efficiency while precisely controlling the liquid flow. The present disclosure limits the aperture range of the liquid inlet hole 111 and / or the liquid outlet hole 112 to 1.5-3 mm. This size range not only adapts to the volume change amplitude of the pumping chamber 10 caused by the small eccentricity, avoiding excessive flow control caused by a large aperture or increased flow resistance caused by a small aperture, but also provides a reasonable passage cross-sectional area for the flow rate and pressure of the liquid during the liquid inlet and outlet process.

[0107] On this basis, the disclosure further explicitly that the liquid outlet hole 112 diameter is greater than or equal to the liquid inlet hole 111, when the displacement mechanism 2 drives the diaphragm 21 to extrude the pumping cavity, the larger liquid outlet hole 112 can reduce the fluid resistance, so that the liquid is extruded at a higher speed under the instantaneous extrusion action of the diaphragm 21, avoid the pressure retention or flow loss caused by the aperture bottleneck. Preferably, in the case of equal aperture of the liquid outlet hole 112 and the liquid inlet hole 111, the flow resistance characteristics of the liquid inlet flow channel 7 and the liquid outlet flow channel 8 tend to be consistent, thereby further improving the stability of fluid exchange.

[0108] In an embodiment of the disclosure, the wall surface of the valve plate 11 towards the second direction X2 is configured to adapt to the shape of the diaphragm 21 when it is in the compressed position. When the diaphragm 21 is driven by the push-pull piece 22 to bend to the compressed position towards the first direction X1, its bending profile completely fits the wall surface of the valve plate 11 towards the second direction X2, thereby eliminating the dead space between the inner wall of the pumping cavity 10 and the diaphragm 21, so that the liquid in the pumping cavity 10 is completely extruded in the compression stroke, realizing "zero residual" liquid discharge, and significantly improving the fluid pumping efficiency of the pump assembly 100.

[0109] In a specific embodiment of the disclosure, when in the compressed position, the elastic portion 213 of the diaphragm 21 is configured to form a curved surface with an opening towards the second direction X2, referring to Figure 9 and Figure 10 , the area of the wall surface of the valve plate 11 towards the second direction X2 corresponding to the elastic portion 213 is configured as an arc surface 114; in addition, the end surface of the connecting piece 214 towards the first direction X1 is configured as a plane, and the area of the wall surface of the valve plate 11 corresponding to the end surface towards the second direction X2 is configured as a plane 113. Specifically, when in the compressed position, the area of the connecting piece 214 on the diaphragm 21 does not deform, and its end surface remains flat, while the elastic portion 213 on the periphery of the connecting piece 214 can bend towards the first direction X1; wherein the plane 113 area on the valve plate 11 corresponds to the connecting piece 214 of the diaphragm 21, and the arc surface 114 area on the valve plate 11 corresponds to the elastic portion 213 of the diaphragm 21. Thus, the wall surface of the valve plate 11 towards the second direction X2 is adapted to the shape of the diaphragm 21 when it is in the compressed position, so that the liquid in the pumping cavity 10 is completely extruded in the compression stroke.

[0110] In one embodiment of the present disclosure, the liquid inlet hole 111 and / or the liquid outlet hole 112 are arranged on the arc surface 114. As described above, the first one-way valve 70 and the second one-way valve 80 need to be arranged on the side of the valve plate 11 away from the diaphragm 21 to communicate with the liquid inlet hole 111 and the liquid outlet hole 112 respectively. If the holes are arranged in the area of the intermediate plane 113, the layout of the valve components will be conflicted due to the limited space. In the present disclosure, at least one of the liquid inlet hole 111 and the liquid outlet hole 112 is arranged on the arc surface 114 of the outer periphery, so that the radial space naturally formed by the curvature of the wall surface is utilized, thereby providing a structural basis for the miniaturization design of the pump assembly 100.

[0111] In one embodiment of the present disclosure, as described above, the compressed position and the expanded position are two limit positions that the diaphragm 21 can reach along the displacement axis X, and there is a relaxed position between the compressed position and the expanded position. When the diaphragm 21 is in the relaxed position, the driven part 211 is basically not affected by external force, and thus remains basically flat and does not deform.

[0112] Referring to Figure 2 and Figure 3 When the diaphragm 21 is in the expanded position, at least part of the diaphragm 21 is configured to form a curved surface with an opening facing the first direction X1. Specifically, when the eccentric mechanism 3 drives the displacement mechanism 2 to move in the second direction X2, the elastic part 213 will move in the second direction X2 following the eccentric mechanism 3. When the displacement mechanism 2 reaches the expanded position, the elastic part 213 reaches the maximum deformation, thereby forming a curved surface with an opening facing the first direction X1. In the present disclosure, the curved surface is formed by pre-tensioning, so that the diaphragm 21 has a pre-tensioned elastic potential reserve. Compared with the diaphragm 21 in the limit position maintaining the relaxed shape in the prior art, this curved surface structure can effectively increase the deformation stroke and the rebounding force of the diaphragm 21 during reciprocating motion, so that the diaphragm 21 can generate a stronger restoring force when compressed in the first direction X1, thereby accelerating the rate of volume reduction of the pumping cavity 10.

[0113] In one specific embodiment of the present disclosure, the distance between the expanded position and the relaxed position along the displacement axis X is 0.2-1.5 mm. Further preferably, the distance between the expanded position and the relaxed position along the displacement axis X is 0.4-1.2 mm. The distance between the expanded position and the relaxed position is the maximum distance of deformation of the elastic part 213 in the second direction X2, that is, the pre-tensioning distance of the diaphragm 21. The present disclosure achieves precise control of the deformation degree of the elastic part 213 of the diaphragm 21, thereby achieving an optimized balance between the fluid output performance and the mechanical reliability of the pump assembly 100. This distance parameter directly corresponds to the deformation of the elastic part 213 of the diaphragm 21 from the natural relaxed state (relaxed position) to the pre-tensioned state (expanded position), ensuring that the elastic part 213 stores sufficient elastic potential during reciprocating motion, and avoiding material fatigue or stress concentration caused by excessive stretching.

[0114] Embodiment Two

[0115] The embodiment provides an oral care device, and the pump assembly 100 provided in the embodiment one can be applied to the oral care device provided in the embodiment. The oral care device can be a device such as a water pick, which can effectively remove bacteria and food residues in the tooth surface and interdental space, thereby achieving an oral care effect.

[0116] With reference to Figure 11 The oral care device provided in the embodiment comprises a holding part 200, a liquid storage tank 300 and the pump assembly 100. The holding part 200 is a holding part for a user to hold when the user uses the oral care device to clean, and the holding part 200 internally accommodates most of the components for realizing the cleaning function. The pump assembly 100 and the liquid storage tank 300 are both arranged in the holding part 200, and the holding part 200 can further be provided with a circuit board, a pipeline and other structures.

[0117] The housing 1 of the pump assembly 100 is provided with a liquid inlet flow channel 7 and a liquid outlet flow channel 8, which are in communication with the pumping cavity 10. One end of the holding part 200 is connected with a nozzle 400, and the nozzle 400 is in communication with the liquid outlet flow channel 8, so that the pulse fluid pumped out of the liquid outlet flow channel 8 can be sprayed out of the nozzle 400, so as to realize the function of flushing the interdental space.

[0118] The liquid storage tank 300 is arranged in the holding part 200, and the liquid storage tank 300 is used for storing fluids such as clean water, mouthwash and oral care liquid. The liquid storage tank 300 is in communication with the liquid inlet flow channel 7, and under the action of the driving mechanism 4, the volume of the pumping cavity 10 is configured to periodically increase and decrease, so as to pump the liquid in the liquid storage tank 300 into the pumping cavity 10 through the liquid inlet flow channel 7, and provide impact fluid through the liquid outlet flow channel 8.

[0119] The pump assembly 100 used in this embodiment has the effect of throttling and saving water. Specifically, the eccentric mechanism in the pump assembly 100 has a small eccentricity, and the pumping cavity 10 has a small volume change range. In this way, the problem of excessive water consumption caused by traditional large flow design is avoided, and the liquid in the liquid storage tank 300 is more durable, and the user does not need to frequently refill water during flushing. The volume of the liquid storage tank 300 can be more miniaturized, reducing the size of the oral care device, making the oral care device more suitable for holding and more portable. In addition, the present disclosure limits the ratio of the projection area of the deformed part of the diaphragm 21 driven part 211 to the projection area of the driven part 211 to be within the range of 0.66-0.92, thereby significantly improving the water impact force of the pump assembly 100, and avoiding the decline in cleaning effect caused by throttling design. Specifically, the eccentric mechanism 3 can drive the push-pull piece 22 to deform part of the driven part 211 of the diaphragm 21, and the larger deformable area makes the diaphragm 21 have a larger deformation range and force when it is moved towards the first direction X1 to extrude the liquid in the pumping cavity 10. The pump assembly 100 of the present disclosure has a stronger impact force and can more efficiently clean dirt in the interdental space, gingival groove and other parts, effectively improving the cleaning effect and user experience.

[0120] Embodiment three

[0121] The present embodiment provides an oral care device, and the pump assembly 100 provided in embodiment one can be applied to the oral care device provided in the present embodiment. The difference between the present embodiment and embodiment two is that the oral care device of the present disclosure can be a flushing integrated device, that is, a device integrating toothbrush function and water flushing function.

[0122] Reference Figure 12 The oral care device provided in the present embodiment includes a holding part 200, a liquid storage tank 300, a brush head driving mechanism 600 and a pump assembly 100. The holding part 200 is a holding part for the user when using the oral care device for cleaning, and most of the components for realizing the cleaning function are accommodated inside. The pump assembly 100, the liquid storage tank 300 and the brush head driving mechanism 600 are all arranged in the holding part 200, and a circuit board, a pipeline and other structures can also be arranged in the holding part 200.

[0123] The one end of the holding portion 200 is connected with a nozzle 400 and a brush head 500, specifically, the nozzle 400 and the brush head 500 are located at the same end of the holding portion 200, the brush head 500 has a plurality of contact element clusters, the contact element clusters are formed by a plurality of contact element clusters, the contact element can be a brush wire, and the nozzle 400 can be located between the plurality of contact element clusters. The shell 1 of the pump assembly 100 is provided with a liquid inlet flow channel 7 and a liquid outlet flow channel 8 which are in communication with the pumping cavity 10, and the nozzle 400 is in communication with the liquid outlet flow channel 8, so that the pulse fluid pumped out of the liquid outlet flow channel 8 can be sprayed out of the nozzle 400 to realize the function of flushing the tooth gap.

[0124] The brush head driving mechanism 600 is configured to drive the brush head 500 to swing to clean the teeth. The brush head driving mechanism 600 can be a rotating motor that can rotate the brush head 500; or the brush head driving mechanism 600 can be a vibration motor (such as a sonic motor) that can make the brush head 500 swing at a high frequency. The brush head driving mechanism 600 of the present embodiment can drive the brush head 500 to swing, and at the same time, the pump assembly 100 can supply liquid to the nozzle 400 through the liquid outlet flow channel 8, so that the oral care device of the present embodiment not only has the tooth brushing function of an electric toothbrush, but also has the flushing function of a water pick, so as to improve the user experience and improve the cleaning effect of the oral cleaner.

[0125] The liquid storage tank 300 is arranged in the holding portion 200, and the liquid storage tank 300 is used to store water, mouthwash, oral care liquid and the like. The liquid storage tank 300 is in communication with the liquid inlet flow channel 7, and under the action of the driving mechanism 4, the volume of the pumping cavity 10 is configured to periodically increase and decrease, so that the liquid in the liquid storage tank 300 is pumped into the pumping cavity 10 through the liquid inlet flow channel 7, and the impact fluid is provided through the liquid outlet flow channel 8.

[0126] Specifically, the output shaft of the brush head driving mechanism 600 can have a hollow flow channel penetrating through the output shaft in the axial direction, and the two ends of the hollow flow channel can be in communication with the liquid outlet flow channel 8 and the nozzle 400, respectively. When the oral care device realizes the water pick function, the pump assembly 100 can guide the liquid in the liquid storage tank 300 to enter the pumping cavity 10 through the liquid inlet flow channel 7, and under the extrusion action of the diaphragm 21, the liquid in the pumping cavity 10 flows out through the liquid outlet flow channel 8 and enters the hollow flow channel, so as to flow out through the nozzle 400 located in the interior of the brush head 500.

[0127] The pump assembly 100 used in this embodiment has the effect of throttling water saving. Specifically, the eccentric mechanism in the pump assembly 100 has a small eccentricity, and the pumping cavity 10 has a small volume variation range. In this way, the problem of excessive water consumption caused by traditional large flow design is avoided, and the liquid in the liquid storage tank 300 is more durable, and the user does not need to frequently supplement water during flushing. In addition, the ratio of the projection area of the deformed part of the diaphragm 21 driven part 211 to the projection area of the driven part 211 is limited to the range of 0.66-0.92, thereby significantly improving the water impact force of the pump assembly 100, and avoiding the decline of cleaning effect caused by throttling design. Specifically, the eccentric mechanism 3 can drive the push-pull piece 22 to deform part of the driven part 211 of the diaphragm 21, and the larger deformable area makes the diaphragm 21 have a larger deformation range and force when it moves towards the first direction X1 to extrude the liquid in the pumping cavity 10. The pump assembly 100 of the present disclosure has stronger impact force, which can more efficiently clean dirt in the tooth gap, gum groove and other parts, effectively improving the cleaning effect and user experience.

[0128] In an embodiment of the present disclosure, the housing 1 of the pump assembly 100 includes a valve plate 11, the valve plate 11 and the diaphragm 21 form a pumping cavity 10, the valve plate 11 is provided with a liquid inlet hole 111 communicated with the liquid inlet channel 7 and a liquid outlet hole 112 communicated with the liquid outlet channel 8; the brush head driving mechanism 600 is arranged on the extension of the valve plate 11. Specifically, the extension of the valve plate 11 can be a mounting piece arranged in the holding part 200, and the pump assembly 100 and the brush head driving mechanism 600 are both mounted on the mounting piece. In this way, the brush head driving mechanism 600 and the pump assembly 100 can be assembled together first, and then assembled as a whole in the holding part 200. It should be noted that the brush head driving mechanism 600 and the pump assembly 100 will both vibrate when working, which makes the connection reliability of the pipeline connected between the liquid outlet channel 8 of the pump assembly 100 and the hollow channel of the output shaft of the brush head driving mechanism 600 poor, and it is easy to fall off. In order to solve the above problem, the brush head driving mechanism 600 can be arranged on the extension of the valve plate 11, so as to realize the assembly of the two, so as to reduce the resonance and improve the stability of the water connection.

[0129] The above has described the embodiments of the present disclosure, the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A pump assembly characterized by, The utility model relates to a pump, comprising: a housing (1) having a pumping cavity (10) formed therein; a displacement axis; a displacement mechanism (2) having a diaphragm (21) configured to enclose the pumping cavity (10) with a portion of an inner wall of the housing (1) on one side of the displacement axis in a first direction; the diaphragm (21) includes a driven portion (211) capable of being deformed at least partially under an external force, and an edge portion (212) located on a peripheral side of the driven portion (211) and engaged with the housing (1); an eccentric mechanism (3) disposed in the housing (1) and drivingly connected to the displacement mechanism (2) on one side of the displacement axis in a second direction opposite to the first direction; the eccentric mechanism (3) is configured to rotate under the action of a driving mechanism (4) and drive the displacement mechanism (2) to reciprocate along the displacement axis in the first direction and the second direction during rotation to cyclically decrease and increase the volume of the pumping cavity (10); wherein the displacement mechanism (2) further includes a push-pull piece (22) drivingly connected to the eccentric mechanism (3), and the driven portion (211) of the diaphragm (21) is configured to be coupled to the push-pull piece (22); the push-pull piece (22) is configured to drive at least a portion of the driven portion (211) to be deformed under the driving action of the eccentric mechanism (3); in a plane perpendicular to the displacement axis, the ratio of the projection area of the deformed portion of the driven portion (211) to the projection area of the driven portion (211) is within the range of 0.66-0.

92.

2. The pump assembly of claim 1, wherein, The ratio of the projection area of the deformed portion of the driven portion (211) to the projection area of the driven portion (211) is within the range of 0.7-0.

91.

3. The pump assembly of claim 2, wherein, The ratio of the projection area of the deformed portion of the driven portion (211) to the projection area of the driven portion (211) is within the range of 0.87-0.

91.

4. The pump assembly of claim 1, wherein, The driven portion (211) includes an elastic portion (213) capable of being deformed, and a connecting piece (214) at least partially engaged with an inner peripheral side of the elastic portion (213) and coupled to the push-pull piece (22); an outer peripheral side of the elastic portion (213) is engaged with the edge portion (212).

5. The pump assembly of claim 4, wherein, The elastic portion (213) is configured in an annular shape, and the annular width of the elastic portion (213) is within the range of 2.2-5.4 mm.

6. The pump assembly of claim 4, wherein, The connecting piece (214) includes a motion transmission end (2141) at least partially engaged with the inner peripheral side of the elastic portion (213), and a coupling end (2142) extending in the second direction and coupled to the push-pull piece (22).

7. The pump assembly of claim 6, wherein, In the second direction, the diameter of the motion transmission end (2141) remains unchanged, and in a state where the elastic portion (213) is not deformed, the extension length of the motion transmission end (2141) is not less than the elastic portion (213); and / or, The motion transmission end (2141) is configured in a circular shape; and / or, The motion transmission end (2141) has a diameter in a range of 3-7 mm; and / or, The coupling end (2142) comprises a transmission member (215) connected with the motion transmission end (2141) and gradually expanding radially at least partially along the second direction.

8. The pump assembly of claim 7, wherein, The coupling end (2142) comprises a transmission member (215) connected with the motion transmission end (2141) and gradually expanding radially at least partially along the second direction, and an outer wall of the transmission member (215) is configured in an arc shape.

9. The pump assembly of claim 6, wherein, In a plane perpendicular to the displacement axis, a ratio of a projection area of the motion transmission end (2141) to an area of the elastic portion (213) is in a range of 0.09-0.37; and / or, in a plane perpendicular to the displacement axis, a ratio of the projection area of the motion transmission end (2141) to an area of the driven portion (211) is in a range of 0.08-0.

28.

10. The pump assembly of claim 9, wherein, In a plane perpendicular to the displacement axis, a ratio of a projection area of the motion transmission end (2141) to an area of the elastic portion (213) is in a range of 0.1-0.14; and / or, in a plane perpendicular to the displacement axis, a ratio of the projection area of the motion transmission end (2141) to an area of the driven portion (211) is in a range of 0.09-0.

12.

11. The pump assembly of claim 6, wherein, The displacement axis is configured to pass through a center of the motion transmission end (2141), and / or, the center of the motion transmission end (2141), a center of the diaphragm (21) and a center of the elastic portion (213) coincide.

12. The pump assembly of claim 6, wherein, In a plane perpendicular to the displacement axis, the projected area of the motion transmission end (2141) is 12.5-28.5 mm 2 .

13. The pump assembly of claim 4, wherein, The displacement axis is configured to pass through a center of the diaphragm (21), and / or, the displacement axis coincides with a central axis of the push-pull member (22), and / or, the displacement axis is configured to pass through a center of the elastic portion (213).

14. The pump assembly of claim 4, wherein, In a plane perpendicular to the displacement axis, a projection of the elastic portion (213) is located at least partially on a periphery side of the connecting member (214); and / or, the projection of the elastic portion (213) is located at least partially on a periphery side of the push-pull member (22).

15. The pump assembly of claim 1, wherein, Based on the push-pull member (22), the displacement mechanism (2) with the diaphragm (21) is formed by two-shot injection molding.

16. The pump assembly of claim 1, wherein, A diameter of the push-pull member (22) is in a range of 1.2-1.8 mm.

17. The pump assembly of claim 1, wherein, The housing (1) is provided with a liquid inlet flow channel (7) and a liquid outlet flow channel (8) in communication with the pumping cavity (10); liquid from the liquid inlet flow channel (7) is configured to flow into the pumping cavity (10), and is configured to flow out through the liquid outlet flow channel (8) under the extrusion of the diaphragm (21) during the movement of the displacement mechanism (2) towards the first direction.

18. The pump assembly of claim 17, wherein, The shell (1) comprises a valve plate (11) which, together with the diaphragm (21), encloses the pumping cavity (10); the valve plate (11) is provided with a liquid inlet hole (111) communicating with the liquid inlet flow channel (7) and a liquid outlet hole (112) communicating with the liquid outlet flow channel (8) in a partitioned manner.

19. The pump assembly of claim 18, wherein, The shell (1) further comprises a cylinder (12) fixedly connected with the valve plate (11), and the edge portion (212) is configured to be clamped between the cylinder (12) and the valve plate (11).

20. The pump assembly of claim 18, wherein, On the side of the valve plate (11) away from the diaphragm (21), a first one-way valve (70) communicating with the liquid inlet flow channel (7) is arranged at a position corresponding to the liquid inlet hole (111), and a second one-way valve (80) communicating with the liquid outlet flow channel (8) is arranged at a position corresponding to the liquid outlet hole (112).

21. The pump assembly of claim 18, wherein, The diameter of the liquid outlet hole (112) is greater than or equal to the diameter of the liquid inlet hole (111); the diameter of the liquid inlet hole (111) is in the range of 1.5-3 mm, and / or the diameter of the liquid outlet hole (112) is in the range of 1.5-3 mm.

22. The pump assembly of claim 18, wherein, The displacement mechanism (2) can be driven by the eccentric mechanism (3) to move along the displacement axis towards the first direction to a compression position and towards the second direction to an expansion position; the wall surface of the valve plate (11) towards the second direction is configured to be adapted to the shape of the diaphragm (21) in the compression position.

23. The pump assembly of claim 22, wherein, The driven portion (211) comprises an elastic portion (213) capable of being deformed; in the compression position, the elastic portion (213) of the diaphragm (21) is configured to form a curved surface with an opening facing the second direction; the area of the wall surface of the valve plate (11) towards the second direction which is adapted to the elastic portion (213) is configured as an arc surface (114).

24. The pump assembly of claim 23, wherein, The liquid inlet hole (111) and / or the liquid outlet hole (112) are arranged on the arc surface (114).

25. The pump assembly of claim 18, wherein, The driven portion (211) comprises an elastic portion (213) capable of being deformed, and a connecting piece (214) at least partially engaged with the inner circumferential side of the elastic portion (213) and coupled to the push-pull piece (22); the end surface of the connecting piece (214) towards the first direction is configured as a plane; the wall surface area of the valve plate (11) corresponding to the end surface towards the second direction is configured as a plane (113).

26. The pump assembly of claim 1, wherein, The displacement mechanism (2) can be driven by the eccentric mechanism (3) to move along the displacement axis towards the first direction to a compression position and towards the second direction to an expansion position; in the expansion position, at least part of the diaphragm (21) is configured to form a curved surface with an opening facing the first direction.

27. The pump assembly of claim 26, wherein, In the relaxed position of the displacement mechanism (2) between the compression position and the expansion position, the driven portion (211) is substantially not deformed; along the displacement axis, the distance between the expansion position and the relaxed position is 0.2-1.5 mm.

28. The pump assembly of claim 27, wherein, The distance between the expanded position and the relaxed position along the displacement axis is 0.4-1.2mm.

29. The pump assembly of claim 1, wherein, The displacement mechanism (2) can be moved by the eccentric mechanism (3) along the displacement axis towards the first direction to a compression position and along the displacement axis towards the second direction to an expansion position; in the expansion position the volume of the pumping chamber (10) is in the range of 80-300 mm 3 .

30. The pump assembly of claim 29, wherein, The volume of the pumping chamber (10) is in the range of 100-250 mm 3 when in the expanded position.

31. The pump assembly of claim 1, wherein, The eccentric mechanism (3) is an eccentric wheel configured to have a rotation axis deviating from its geometric center; wherein the eccentricity of the eccentric wheel is in the range of 0.5-1.2mm.

32. The pump assembly of claim 31, wherein, The eccentricity of the eccentric wheel is in the range of 0.8-1.2mm.

33. An oral treatment device, characterized by It comprises: a holding part (200) having a nozzle (400) connected at one end thereof; a liquid storage tank (300) arranged in the holding part (200); a pump assembly (100) according to any one of claims 1-32 arranged in the holding part (200); the housing (1) of the pump assembly (100) is provided with a liquid inlet channel (7) and a liquid outlet channel (8) in communication with the pumping cavity (10), the liquid storage tank (300) is in communication with the liquid inlet channel (7), and the nozzle (400) is in communication with the liquid outlet channel (8); during rotation of the eccentric mechanism (3), the volume of the pumping cavity (10) periodically increases and decreases, so that the liquid in the liquid storage tank (300) is pumped into the pumping cavity (10) through the liquid inlet channel (7) and impact fluid is provided through the liquid outlet channel (8).

34. An oral treatment device, characterized by It comprises: a holding part (200) having a nozzle (400) and a brush head (500) connected at one end thereof; a liquid storage tank (300) arranged in the holding part (200); a brush head driving mechanism (600) configured to drive the brush head (500) to swing; a pump assembly (100) according to any one of claims 1-32 arranged in the holding part (200); the housing (1) of the pump assembly (100) is provided with a liquid inlet channel (7) and a liquid outlet channel (8) in communication with the pumping cavity (10), the liquid storage tank (300) is in communication with the liquid inlet channel (7), and the nozzle (400) is in communication with the liquid outlet channel (8); during rotation of the eccentric mechanism (3), the volume of the pumping cavity (10) periodically increases and decreases, so that the liquid in the liquid storage tank (300) is pumped into the pumping cavity (10) through the liquid inlet channel (7) and impact fluid is provided through the liquid outlet channel (8).

35. The oral care device of claim 34, wherein, The housing (1) of the pump assembly (100) comprises a valve plate (11) which, together with the diaphragm (21), encloses the pumping cavity (10); the valve plate (11) is provided with a liquid inlet hole (111) in communication with the liquid inlet channel (7) and a liquid outlet hole (112) in communication with the liquid outlet channel (8); the brush head driving mechanism (600) is arranged on an extension of the valve plate (11).

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