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. A liquid inlet flow channel and a liquid outlet flow channel which are communicated with the pumping cavity are formed in the shell; the shell comprises a valve plate; a diaphragm is arranged on the side, facing the first direction, of the displacement mechanism, and a pumping cavity is defined by the diaphragm and the valve plate. Liquid from the liquid inlet flow channel flows into the pumping cavity and flows out in the process that the displacement mechanism moves towards the first direction; the eccentric mechanism is connected with the side, facing the second direction, of the displacement mechanism. The eccentric mechanism drives the displacement mechanism to reciprocate in the first direction and the second direction in the rotating process. The displacement mechanism can move to a first limit position in the first direction and move to a second limit position in the second direction. At least part of the diaphragm is bent towards the first direction when the diaphragm is located at the first limit position; the wall face, facing the second direction, of the valve plate is configured to be matched with the diaphragm in shape when the diaphragm is located at the first limit position.

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, an eccentric member in the pump assembly can drive a diaphragm to reciprocate under the driving action of a driving mechanism, thereby reciprocating to increase and decrease the volume of a pumping cavity, and thus pumping out pulse fluid.

[0003] In an oral care device such as a water pick, the above pump assembly can be used to achieve the function of pumping water. However, the water pick has a high requirement for fluid impact force, and fluid with insufficient impact force will result in poor rinsing effect of the water pick 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 is formed in the housing, and a liquid inlet flow channel and a liquid outlet flow channel are provided on the housing and communicate with the pumping cavity; the housing comprises a valve plate, and a liquid inlet hole and a liquid outlet hole are separately provided on the valve plate and communicate with the liquid inlet flow channel and the liquid outlet flow channel;

[0007] a displacement mechanism connected to the housing; one side of the displacement mechanism towards a first direction is provided with a diaphragm, and the diaphragm is configured to form the pumping cavity together with the valve plate; liquid from the liquid inlet flow channel is configured to flow into the pumping cavity, and in the process of the displacement mechanism moving towards the first direction, the liquid flows out through the liquid outlet flow channel under the extrusion of the diaphragm;

[0008] an eccentric mechanism connected to one side of the displacement mechanism towards a second direction opposite to the first direction; the eccentric mechanism is configured to rotate under the action of a driving mechanism and drive the displacement mechanism to reciprocate along the first direction and the second direction in the process of rotation;

[0009] wherein the displacement mechanism can move to a first limit position along the first direction and move to a second limit position along the second direction; at least part of the diaphragm is bent towards the first direction when located at the first limit position; the wall surface of the valve plate towards the second direction is configured to be adapted to the shape of the diaphragm when located at the first limit position.

[0010] In one embodiment of the present disclosure, the displacement mechanism further comprises a push-pull member connected to the eccentric mechanism, the push-pull member is configured to reciprocate in a first direction and a second direction during rotation of the eccentric mechanism; a boss portion protruding in the second direction is arranged on the diaphragm, the diaphragm is configured to be connected to the push-pull member through the boss portion; when moving in the first direction, the boss portion is configured to drive part of the diaphragm to bend towards the first direction.

[0011] In one embodiment of the present disclosure, when located at the first limit position, the diaphragm is configured to have an end face corresponding to the boss portion facing the first direction abutting against a wall face of the valve plate facing the second direction.

[0012] In one embodiment of the present disclosure, an end face of the boss portion facing the first direction is configured as a plane; an area of the wall face of the valve plate facing the second direction corresponding to the boss portion is configured as a plane.

[0013] In one embodiment of the present disclosure, the boss portion is arranged at a central position of the diaphragm, and a middle position of the wall face of the valve plate facing the second direction is configured as a plane area.

[0014] In one embodiment of the present disclosure, on the wall face of the valve plate facing the second direction, an arc face is smoothly connected around the middle plane area; when located at the first limit position, part of the diaphragm is configured to bend towards the first direction to abut against the arc face.

[0015] In one embodiment of the present disclosure, a center distance between the liquid inlet hole and the liquid outlet hole is in a range of 3-13 mm;

[0016] In a case where an area of the middle plane area of the valve plate is less than or equal to 7 mm 2 , the liquid inlet hole and the liquid outlet hole are arranged on the arc face;

[0017] In a case where an area of the middle plane area of the valve plate is greater than 7 mm 2 and less than 133 mm 2 , at least one of the liquid inlet hole and the liquid outlet hole is arranged on the arc face.

[0018] In one embodiment of the present disclosure, an area of an end face of the boss portion facing the first direction is the same as an area of the plane area on the valve plate; the area of the plane area on the valve plate is in a range of 19.6-37.7 mm 2 .

[0019] In one embodiment of the present disclosure, the end face of the diaphragm corresponding to the boss portion and facing the first direction is configured as a first curved surface; the area on the wall face of the valve plate corresponding to the boss portion and facing the second direction is configured as a second curved surface matching the first curved surface; the first curved surface and the second curved surface are configured to curve towards the first direction.

[0020] In one embodiment of the present disclosure, the boss portion is arranged at the center of the diaphragm, and the second curved surface is located at the middle region of the wall face of the valve plate facing the second direction.

[0021] In one embodiment of the present disclosure, on the wall face of the valve plate facing the second direction, a third curved surface is smoothly connected around the second curved surface, and the third curved surface has a curvature less than or equal to the second curved surface; when the diaphragm is located at the first limit position, the diaphragm is configured to curve towards the first direction to fit the third curved surface.

[0022] In one embodiment of the present disclosure, when the diaphragm is located at the second limit position, at least part of the diaphragm is configured to extend 0.5-1 mm towards the second direction under the driving action of the push-pull member.

[0023] In one embodiment of the present disclosure, 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.

[0024] 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.

[0025] In one embodiment of the present disclosure, when the displacement mechanism is located at the second limit position, the volume of the pumping cavity is in the range of 80-300 mm 3 .

[0026] In one embodiment of the present disclosure, the eccentric mechanism is an eccentric wheel configured to have a rotation axis deviating from its geometric center; wherein the eccentric distance of the eccentric wheel is in the range of 0.5-1.2 mm.

[0027] According to a second aspect of the present disclosure, there is also provided an oral care device, comprising:

[0028] a holding portion, one end of the holding portion being connected with a nozzle;

[0029] a liquid storage tank arranged in the holding portion;

[0030] The pump assembly according to the first aspect of the present disclosure is arranged in the handle; the liquid inlet channel is in communication with the liquid storage tank, and the liquid outlet channel is in communication with the nozzle; 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 channel, and impact fluid is provided through the liquid outlet channel.

[0031] According to the third aspect of the present disclosure, an oral care device is also provided, comprising:

[0032] A handle, one end of the handle being connected with a nozzle and a brush head;

[0033] A liquid storage tank arranged in the handle;

[0034] A brush head driving mechanism configured to drive the brush head to oscillate;

[0035] The pump assembly according to the first aspect of the present disclosure is arranged in the handle; the liquid inlet channel is in communication with the liquid storage tank, and the liquid outlet channel is in communication with the nozzle; 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 channel, and impact fluid is provided through the liquid outlet channel.

[0036] In one embodiment of the present disclosure, the brush head driving mechanism is arranged on the extension of the valve plate.

[0037] One beneficial effect of the present disclosure is that the wall surface of the valve plate towards the second direction is adapted to the shape of the diaphragm when the diaphragm is at the first limit position, thereby completely eliminating the dead space between the valve plate and the diaphragm. When entering the compression stroke, the liquid in the pumping cavity can be completely discharged through the liquid outlet channel without any residue under the extrusion of the diaphragm. This "zero residue" liquid discharge effect makes the liquid be completely output during each pumping process, avoiding energy loss caused by liquid residue. Compared with the traditional pump assembly, the present disclosure enables the liquid to be pumped with higher efficiency and complete volume, significantly enhancing the impact force of the output liquid, and in application scenarios such as oral care devices that require impact fluid, the liquid can be more efficiently cleaned and flushed, greatly improving the actual use performance and application value of the pump assembly.

[0038] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings incorporated in and forming 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.

[0040] Figure 1 is a cross-sectional view of the pump assembly at a first extreme position according to an embodiment of the present disclosure;

[0041] Figure 2 is a cross-sectional view of the pump assembly at a relaxed position according to an embodiment of the present disclosure;

[0042] Figure 3 is a cross-sectional view of the pump assembly at a second extreme position according to an embodiment of the present disclosure;

[0043] Figure 4 is a partial enlarged view of the mobile mechanism position in Figure 3

[0044] Figure 5 is a side view of the displacement mechanism according to an embodiment of the present disclosure;

[0045] Figure 6 is a top view of the displacement mechanism according to an embodiment of the present disclosure;

[0046] Figure 7 is a structural schematic view of the pump assembly according to an embodiment of the present disclosure;

[0047] Figure 8 is a structural schematic view of the valve plate according to an embodiment of the present disclosure;

[0048] Figure 9 is a cross-sectional view of the valve plate according to an embodiment of the present disclosure;

[0049] Figure 10 is a side view of the displacement mechanism according to another embodiment of the present disclosure;

[0050] Figure 11 is a cross-sectional view of the valve plate according to another embodiment of the present disclosure;

[0051] Figure 12 is a structural schematic view of the oral care device according to an embodiment of the present disclosure;

[0052] Figure 13 is a structural schematic view of the oral care device according to another embodiment of the present disclosure.

[0053] Figures 1 to 13 The one-to-one correspondence between the names of the components and the reference numerals in

[0054] ​100 pump assembly; 1 housing; 10 pumping cavity; 11 valve plate; 111 inlet hole; 112 outlet hole; 113 flat area; 114 arc surface; 115 second arc surface; 116 third arc surface; 2 displacement mechanism; 21 diaphragm; 211 elastic part; 212 boss part; 213 first arc surface; 22 push-pull piece; 3 eccentric mechanism; 4 driving mechanism; 41 driving shaft; 5 connecting rod; 6 bearing; 7 inlet flow channel; 70 first one-way valve; 8 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

[0055] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps set forth in the embodiments, numerical expressions, and numerical values are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0056] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the disclosure and its applications or uses.

[0057] Techniques, methods, and devices 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 description if appropriate.

[0058] It should be noted that like reference numerals and letters in the various figures indicate similar items, and, thus, no further discussion will be provided herein.

[0059] 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.

[0060] In this document, "first", "second", and the like are used to distinguish between the relevant parts from each other, and are not intended to represent importance and order, and a prerequisite for each other.

[0061] In this document, "equal", "same", and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and allowed in manufacturing or use, etc.

[0062] Embodiment One

[0063] Reference Figures 1 to 3The embodiment provides a pump assembly 100, in particular, the pump assembly 100 can be a diaphragm pump which can be widely applied to various industrial fields to pump fluid medium. The pump assembly 100 comprises a housing 1, a displacement mechanism 2 and an eccentric mechanism 3. As shown in the figure, Figure 1 The housing 1 is used for mounting and accommodating various structures and components of the pump assembly 100, and a pumping cavity 10 is formed in the housing 1. Referring to Figure 7 Liquid inlet flow channels 7 and liquid outlet flow channels 8 are formed in the housing 1 and communicate with the pumping cavity 10, so that liquid can flow into the pumping cavity 10 from the liquid inlet flow channels 7 and flow out through the liquid outlet flow channels 8.

[0064] Referring to Figure 7 and Figure 8 The housing 1 comprises a valve plate 11 which participates in forming the pumping cavity 10. The valve plate 11 can be formed as a part of the housing 1 and integrally formed with the housing 1, or can be a part fixedly mounted on the housing 1. The valve plate 11 is divided into a liquid inlet hole 111 which communicates with the liquid inlet flow channels 7 and a liquid outlet hole 112 which communicates with the liquid outlet flow channels 8. On the outer side of the valve plate 11 (i.e. the side away from the pumping cavity 10), a first one-way valve 70 which communicates with the liquid inlet flow channels 7 is arranged at a position corresponding to the liquid inlet hole 111, and a second one-way valve 80 which communicates with the liquid outlet flow channels 8 is arranged at a position corresponding to the liquid outlet hole 112. The first one-way valve 70 and the second one-way valve 80 can ensure that the flow direction of the liquid is correct and no backflow occurs. Specifically, liquid from the liquid inlet flow channels 7 flows into the pumping cavity 10 through the liquid inlet hole 111 via the first one-way valve 70.

[0065] Referring to Figures 1 to 4 The displacement mechanism 2 is connected to the housing 1 and can move relative to the housing 1 along a displacement axis. In the figure, Figure 1 The dashed line extending transversely in the figure represents the displacement axis X, and the left side indicated by the arrow represents a first direction X1 and the right side represents a second direction X2. A diaphragm 21 is arranged on the side of the displacement mechanism 2 facing the first direction X1, and the diaphragm 21 is configured to form the pumping cavity 10 together with the valve plate 11. The volume of the pumping cavity 10 can change during the movement of the displacement mechanism 2, so that the liquid in the pumping cavity 10 can be pumped out. Specifically, liquid from the liquid inlet flow channels 7 is configured to flow into the pumping cavity 10 and flow out through the liquid outlet flow channels 8 under the extrusion of the diaphragm 21 during the movement of the displacement mechanism 2 towards the first direction X1. When the displacement mechanism 2 moves, the volume of the pumping cavity 10 changes, so that the pressure inside the pumping cavity 10 changes, and thus the fluid can be pumped out from the liquid outlet flow channels 8 by using the pressure.

[0066] The eccentric mechanism 3 is connected to one side of the displacement mechanism 2 in the second direction X2, and is configured to rotate under the action of the driving mechanism 4 and drive the displacement mechanism 2 to reciprocate along the first direction X1 and the second direction X2 during rotation to cyclically reduce and increase the volume of the pumping cavity 10. In an embodiment of the present disclosure, the eccentric mechanism 3 is an eccentric wheel configured to have a rotation axis offset from its geometric center, Figure 1 The dashed line extending vertically in the middle is the rotation axis Z.

[0067] In a specific 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 0.5-1.2mm, which significantly reduces the reciprocating stroke of the displacement mechanism 2 driven by the rotation of the eccentric wheel, 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, the volume change rate of the pumping cavity 10 is reduced, and the liquid flow output per unit time is effectively inhibited, achieving the effect of throttling and water saving.

[0068] Reference Figures 1 to 3 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 a motor, and 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 secure the eccentric mechanism 3. The eccentric wheel can be provided with an axis hole offset from its geometric center, and the rotation center line of the eccentric wheel is the axis of the axis hole, and the driving shaft 41 penetrates the axis hole, and when the driving mechanism 4 works, the driving shaft 41 can drive the eccentric wheel to rotate around the rotation axis.

[0069] In an embodiment of the present disclosure, a connecting rod 5 is further provided in the housing 1, and the connecting rod 5 is 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 in 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.

[0070] In one embodiment of the present disclosure, a bearing 6 is further arranged in the housing 1, and the bearing 6 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 direction of the displacement axis.

[0071] In one embodiment of the present disclosure, referring to Figures 4 to 6 , the displacement mechanism 2 comprises a push-pull piece 22 connected with the eccentric mechanism 3, and the diaphragm 21 is provided with a boss portion 212 protruding in the second direction, and the diaphragm 21 is configured to be connected with the push-pull piece 22 through the boss portion 212. During the 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. Specifically, the push-pull piece 22 can be a screw fixed with the diaphragm 21, and one end of the push-pull piece 22 towards the second direction X2 can be fixedly connected with the connecting rod 5, and the other end of the push-pull piece 22 towards the first direction X1 can be connected with the boss portion 212 of the diaphragm 21. The connecting rod 5 drives the push-pull piece 22 to move under the driving action of the eccentric mechanism 3, and in turn drives the diaphragm 21 to reciprocate along the first direction X1 and the second direction X2 through the boss portion 212, so as to periodically increase and decrease the volume of the pumping cavity 10.

[0072] In one embodiment of the present disclosure, referring to Figure 6 , the diaphragm 21 has an elastic portion 211 capable of deforming under the action of the motion transmitted during the rotation of the eccentric mechanism 3. It can be understood that, in addition to the elastic portion 211 capable of deforming, the diaphragm 21 also has a part that cannot deform, such as the boss portion 212 described above, and the diaphragm 21 also includes a part for engaging with the housing 1, which can be integrally formed with the elastic portion 211 to form the diaphragm 21, but cannot deform under the action of external force. Specifically, in a plane perpendicular to the displacement axis, the projection of the elastic portion 211 is at least partially located on the outer circumferential side of the boss portion 212; and / or, the projection of the elastic portion 211 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 boss portion 212, the elastic portion 211 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.

[0073] The displacement mechanism 2 can move to a first limit position along the first direction X1, and move to a second limit position along the second direction X2, Figure 1 , which is a cross-sectional view of the pump assembly 100 when the displacement mechanism 2 moves to the first limit position, Figure 3 , which is a cross-sectional view of the pump assembly 100 when the displacement mechanism 2 moves to the second limit position. Referring to Figure 2When the displacement mechanism 2 is in the relaxed position between the first and second extreme positions, the elastic part 211 basically does not deform. Specifically, the first and second extreme positions are the two extreme positions that the diaphragm 21 can reach along the displacement axis. There is a relaxed position between the two. When it is in the relaxed position, the elastic part 211 is basically not subjected to external force, so it basically remains flat and does not deform.

[0074] like Figure 1 As shown, when in the first extreme position, at least a portion of the diaphragm 21 bends towards the first direction, and the wall surface of the valve plate 11 facing the second direction is configured to match the shape of the diaphragm 21 when in the first extreme position. Specifically, when moving along the first direction X1, the boss 212 can drive a portion of the diaphragm 21 to bend towards the first direction X1, that is, at least the elastic portion 211 of the diaphragm 21 deforms. In the first extreme position, the bending profile of the diaphragm 21 completely fits the wall surface of the valve plate 11 facing the second direction X2, thereby completely eliminating the dead space between the valve plate 11 and the diaphragm 21. When entering the compression stroke, the liquid in the pumping chamber 10 can be discharged without residue through the liquid outlet channel 8 under the compression of the diaphragm 21. This "zero residue" discharge effect ensures that all liquid is output during each pumping process, avoiding energy loss due to liquid residue. Compared to traditional pump assemblies, this disclosure enables liquids to be pumped with higher efficiency and full volume, significantly enhancing the impact force of the output liquid. In applications requiring impact fluids, such as oral care equipment, it enables more efficient cleaning and rinsing, greatly improving the actual performance and application value of the pump assembly 100.

[0075] In one embodiment of this disclosure, when in the first extreme position, the end face of the diaphragm 21 facing the first direction X1 and corresponding to the boss portion 212 is configured to fit against the wall surface of the valve plate 11 facing the second direction X2. In this embodiment, as... Figure 5 As shown, the end face of the boss portion 212 facing the first direction is constructed as a plane; based on this, as... Figure 8 and Figure 9 As shown, the area on the wall of the valve plate 11 facing the second direction that matches the boss portion 212 is constructed as a planar region 113. Specifically, the planar region 113 corresponds to the end face of the boss portion 212 facing the valve plate 11 (i.e., facing the first direction X1), and the two have basically the same area and are both constructed as planar structures. Thus, when the displacement mechanism 2 moves to the first limit position, the end face of the boss portion 212 can completely fit the planar region 113 on the valve plate 11, so that no liquid remains between the boss portion 212 and the inner wall of the valve plate 11, completely eliminating the dead space between the valve plate 11 and the boss portion 212.

[0076] In one specific embodiment of this disclosure, such as Figure 6As shown, the boss portion 212 is arranged at the center of the diaphragm 21, and the displacement axis can pass through the center of the diaphragm 21, and at the same time, the displacement axis coincides with the center axis of the push-pull piece 22 and the boss portion 212. The boss portion 212 can be arranged at the center of the diaphragm 21, thereby ensuring that the diaphragm 21 is uniformly and symmetrically stressed during reciprocating motion, and avoiding local stress concentration on 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 direction of the displacement axis through the boss portion 212, prompting the diaphragm 21 to symmetrically deform around the displacement axis during reciprocating motion in the first direction X1 and the second direction X2, thereby significantly improving the consistency and controllability of the deformation of the diaphragm 21, reducing material fatigue loss caused by uneven deformation, and prolonging the service life of the displacement mechanism 2.

[0077] In the case where the boss portion 212 is located at the center of the diaphragm 21, the opposite wall surface of the valve plate 11 towards the second direction is configured as a flat area 113 at the middle position. Referring to Figure 8 and Figure 9 On the wall surface of the valve plate 11 towards the second direction, the flat area at the middle position is smoothly connected with an arc surface 114 around it; when in the first limit position, part of the diaphragm 21 is configured to bend towards the first direction to fit the arc surface 114. Specifically, when in the first limit position, the region of the boss portion 212 on the diaphragm 21 does not deform, while the elastic portion 211 on the periphery of the boss portion 212 can bend towards the first direction X1, and the region of the arc surface 114 on the valve plate 11 is arranged corresponding to the elastic portion 211 of the diaphragm 21. Thus, the wall surface of the valve plate 11 towards the second direction X2 completely matches the shape of the diaphragm 21 when in the first limit position, so that the liquid in the pumping cavity 10 is completely squeezed out during the compression stroke.

[0078] In one specific embodiment of the present disclosure, when the displacement mechanism 2 is in the second limit 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 can be 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 the volume of the pumping cavity 10 can be adaptively reduced, thereby improving the effect of throttling and water saving.

[0079] In one specific embodiment of the present disclosure, the diameter of the liquid inlet hole 111 is in the range of 1.5-3mm, and / or the diameter of the liquid outlet hole 112 is in the range of 1.5-3mm. In addition, the diameter of the liquid outlet hole 112 is greater than or equal to the diameter of the liquid inlet hole 111. The present disclosure optimizes the matching of the fluid passage of the pump assembly 100 by limiting the diameter parameters and proportional relationship of the liquid inlet hole 111 and the liquid outlet hole 112. Specifically, the pump assembly 100 of the present disclosure adopts a smaller eccentricity and a pump cavity 10 size, thereby effectively reducing the water consumption per unit time. The diameters of the liquid inlet hole 111 and the liquid outlet hole 112 are matched with the foregoing 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 1.5-3mm. This size interval not only adapts to the volume variation range of the pump cavity 10 caused by the smaller eccentricity, avoids the loss of control of the flow caused by the excessively large aperture, or the increase of flow resistance caused by the excessively 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.

[0080] In one specific embodiment of the present disclosure, the end surface area of the boss portion 212 towards the first direction is the same as the area of the planar region 113 on the valve plate 11. The area of the planar region 113 on the valve plate 11 is in the range of 19.6-37.7mm 2 , preferably, the area of the planar region 113 on the valve plate 11 is in the range of 28-29mm 2 . The above limitation on the area of the planar region 113 is equivalent to the size limitation of the boss portion 212. The boss portion 212 needs to be coupled with the push-pull piece 22 (such as a screw) through processes such as encapsulation and injection molding. If the size of the boss portion 212 is too small, it will cause the push-pull piece 22 to break due to stress concentration during reciprocating motion, affecting the service life. If the area of the boss portion 212 is too large, it will occupy the area of the elastic portion 211 on the diaphragm 21, causing the deformable area of the diaphragm 21 to decrease, resulting in a decrease in the impact force of pumping. The present disclosure takes into account the miniaturization design requirement and process feasibility of the pump assembly 100, achieving dual optimization of structural strength and assembly reliability.

[0081] In one embodiment of the present disclosure, the center distance between the liquid inlet hole 111 and the liquid outlet hole 112 is in the range of 3-13mm. In the case where the area of the middle planar region 113 of the valve plate 11 is less than or equal to 7mm 2 , both the liquid inlet hole 111 and the liquid outlet hole 112 are arranged on the arc surface 114. In the case where the area of the middle planar region 113 of the valve plate 11 is greater than 7mm 2 and less than 133mm 2 , at least one of the liquid inlet hole 111 and the liquid outlet hole 112 is arranged on the arc surface 114. In this embodiment, the area of the planar region 113 on the valve plate 11 is in the range of 19.6-37.7mm2 the range of 0.5-1mm, so at least one of the liquid inlet hole 111 and the liquid outlet hole 112 can be arranged on the arc surface 114, for example, both of them can be 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 installed on the side of the valve plate 11 away from the diaphragm 21 and communicate with the liquid inlet hole 111 and the liquid outlet hole 112 respectively. If the holes are opened in the middle planar area 113 under the condition that the area of the planar area 113 is small, the valve layout will be conflicted due to the limited space. The present disclosure arranges at least one of the liquid inlet hole 111 and the liquid outlet hole 112 on the arc surface 114 of the outer periphery, so as to utilize the radial space naturally formed by the curvature of the wall surface, thereby providing a structural basis for the miniaturization design of the pump assembly 100.

[0082] In an embodiment of the present disclosure, referring to Figure 4 , when in the second limit position, at least part of the diaphragm 21 is configured to extend 0.5-1mm towards the second direction X2 under the driving action of the push-pull piece 22. Specifically, when the push-pull piece 22 drives the diaphragm 21 to move towards the second direction X2, the elastic part 211 will move towards the second direction X2 along with the push-pull piece 22, and when reaching the second limit position, the elastic part 211 reaches the maximum deformation amount, thereby forming a curved surface with the opening facing the first direction X1. As shown in Figure 4 , the distance between the second limit position and the relaxed position is 0.5-1mm, which is the maximum distance of deformation of the elastic part 211 towards the second direction X2, that is, the pre-tensioning distance of the diaphragm 21.

[0083] The present disclosure pre-tensions at least part of the diaphragm 21 in the second limit position to extend 0.5-1mm towards the second direction X2, thereby improving the resilience of the diaphragm 21, and further improving the instantaneous speed and impact force of the pump assembly 100. Specifically, the curved surface formed by pre-tensioning enables the diaphragm 21 to have pre-stretching elastic potential energy reserve. Compared with the relaxed form of the diaphragm 21 in the limit position in the prior art, the present disclosure can effectively increase the deformation stroke and resilience of the diaphragm 21 during reciprocating motion, so that the diaphragm 21 can generate stronger restoring force when compressed towards the first direction X1, thereby accelerating the rate of volume reduction of the pumping cavity 10. The improvement of the instantaneous speed is crucial for scenarios requiring pulse high-pressure fluid output (such as impact water flow of oral care equipment), and can form a fluid jet with greater impact force, effectively enhancing the cleaning or impact effect on the target surface.

[0084] Example Two

[0085] The embodiment also provides a pump assembly 100, which is mainly different from the first embodiment in the shape of the boss portion 212 and the shape of the wall surface of the valve plate 11. The other structures and working principles of the pump assembly 100 provided by the embodiment can be completely consistent with the first embodiment, and will not be described hereinafter.

[0086] With reference to Figure 10 and Figure 11 , the end surface of the diaphragm 21 corresponding to the boss portion 212 and facing the first direction X1 is configured as a first arc surface 213, and the region of the wall surface of the valve plate 11 corresponding to the boss portion 212 and facing the second direction X2 is configured as a second arc surface 115 matched with the first arc surface 213; the first arc surface 213 and the second arc surface 115 are configured to be curved toward the first direction X1. As shown in Figure 10 , in the relaxed state, the first arc surface 21 of the boss portion 212 protrudes from the elastic portion 211 along the first direction X1; in order to match the configuration of the boss portion 212, the second arc surface 115 is arranged on the wall surface of the valve plate 11 facing the second direction X2, and the curvature of the first arc surface 213 and the second arc surface 115 is basically consistent. Thus, when the displacement mechanism 2 moves to the first limit position, the first arc surface 213 of the boss portion 212 can completely fit the second arc surface 115 on the valve plate 11, so that there is no liquid remaining between the boss portion 212 and the inner wall of the valve plate 11, and the dead space between the valve plate 11 and the boss portion 212 is completely eliminated.

[0087] In one embodiment of the present disclosure, the boss portion 212 is arranged at the central position of the diaphragm 21, and the second arc surface 115 is located in the middle region of the wall surface of the valve plate 11 facing the second direction X2. The boss portion 212 can be arranged at the central position of the diaphragm 21, so as to ensure that the diaphragm 21 is uniformly and symmetrically stressed during reciprocating movement, and avoid local stress concentration of the diaphragm 21 caused by eccentric load due to axis offset.

[0088] With reference to Figure 11 , around the second arc surface 115 on the wall surface of the valve plate 11 facing the second direction X2, a third arc surface 116 is smoothly connected, and the curvature of the third arc surface 116 is less than or equal to that of the second arc surface 115; when located at the first limit position, the diaphragm 21 is configured to be curved toward the first direction X1 to fit the third arc surface 116. Specifically, when located at the first limit position, the region of the boss portion 212 on the diaphragm 21 does not deform, i.e., the curvature of the first arc surface 213 is maintained, while the elastic portion 211 on the periphery of the boss portion 212 can be curved toward the first direction X1, and the region of the third arc surface 116 on the valve plate 11 is arranged corresponding to the elastic portion 211 of the diaphragm 21. Thus, the shape of the wall surface of the valve plate 11 facing the second direction X2 completely matches the shape of the diaphragm 21 when located at the first limit position, so that the liquid in the pumping cavity 10 is completely squeezed out in the compression stroke.

[0089] Embodiment Three

[0090] The embodiment provides an oral care device, and the pump assembly 100 provided in the embodiment one or the embodiment two 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 the interdental space, thereby achieving an oral care effect.

[0091] With reference to Figure 12 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 most of the components for realizing the cleaning function are accommodated in the holding part 200. The pump assembly 100 and the liquid storage tank 300 are both arranged in the holding part 200, and a circuit board, a pipeline and other structures can also be arranged in the holding part 200.

[0092] As described in the embodiment one, the housing 1 of the pump assembly 100 is provided with the liquid inlet flow channel 7 and the 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.

[0093] 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.

[0094] The pump assembly 100 adopted in the 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 variation range, so as to avoid the problem of large water consumption caused by the traditional large flow design. The liquid in the liquid storage tank 300 is more durable, and the user does not need to frequently supplement water during the flushing process. The volume of the liquid storage tank 300 can be more miniaturized, so as to reduce the volume of the oral care device, so that the oral care device is more suitable for holding and more portable. In addition, since the wall surface of the valve plate 11 towards the second direction is matched with the shape of the diaphragm 21 when the diaphragm 21 is located at the first limit position, the dead angle space between the valve plate 11 and the diaphragm 21 is completely eliminated. When entering the compression stroke, the liquid in the pumping cavity 10 can be completely discharged through the liquid outlet flow channel 8 under the extrusion of the diaphragm 21. The "zero residue" liquid discharge effect makes the liquid be completely output in each pumping process, avoids the energy loss caused by the liquid residue, and avoids the decline of the cleaning effect caused by the throttling design.

[0095] Embodiment Four

[0096] The oral care device provided in this embodiment can apply the pump assembly 100 provided in Embodiment One or Embodiment Two. Different from Embodiment Three, the oral care device of the present disclosure can be a flush integrated device, that is, a device integrating toothbrush function and waterpik function.

[0097] With reference to Figure 13 The oral care device provided in this embodiment includes a handle 200, a liquid storage tank 300, a brush head driving mechanism 600, and a pump assembly 100. The handle 200 is a holding part for the user to hold when using the oral care device for cleaning, and contains most of the components for realizing the cleaning function inside. The pump assembly 100, the liquid storage tank 300, and the brush head driving mechanism 600 are all arranged in the handle 200, and the handle 200 can also be provided with a circuit board, a pipeline, and other structures.

[0098] One end of the handle 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 handle 200. The brush head 500 has a plurality of contact element clusters, and each contact element cluster is formed by bundling a plurality of contact elements. The contact elements can be brush filaments, and the nozzle 400 can be located between the plurality of contact element clusters. As described in Embodiment One, 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. The nozzle 400 is in communication with the liquid outlet flow channel 8, so that the pulsed 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 interdental space.

[0099] 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 capable of rotating the brush head 500, or the brush head driving mechanism 600 can be a vibrating motor (such as a sonic motor) capable of high-frequency swinging of the brush head 500. The brush head driving mechanism 600 of this 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. Thus, the oral care device of this embodiment not only has the toothbrush function of an electric toothbrush, but also has the flushing function of a waterpik, so as to improve the user experience and improve the cleaning effect of the oral care device.

[0100] The liquid storage tank 300 is arranged in the holding portion 200, and is used to store fluids such as clean water, mouthwash, oral care liquid, etc. The liquid storage tank 300 is in communication with the liquid inlet channel 7. 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 channel 7, and the impact fluid is provided through the liquid outlet channel 8.

[0101] Specifically, the output shaft of the brush head driving mechanism 600 can have a hollow channel passing through the output shaft in the axial direction. The two ends of the hollow channel can be in communication with the liquid outlet channel 8 and the nozzle 400, respectively. When the oral care device implements the water flushing 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 channel 7. Under the extrusion action of the diaphragm 21, the liquid in the pumping cavity 10 flows out through the liquid outlet channel 8 and enters the hollow channel, and then flows out through the nozzle 400 located inside the brush head 500.

[0102] The pump assembly 100 used in the 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 variation range. In this way, the problem of excessive water consumption caused by the traditional large flow design is avoided, and the liquid in the liquid storage tank 300 is more durable, so the user does not need to frequently refill water during the flushing process. In addition, since the wall surface of the valve plate 11 facing the second direction is adapted to the shape of the diaphragm 21 when it is located at the first limit position, the dead space between the valve plate 11 and the diaphragm 21 is completely eliminated. When entering the compression stroke, the liquid in the pumping cavity 10 is extruded by the diaphragm 21 and can be discharged without any residue through the liquid outlet channel 8. This "zero residue" liquid discharge effect makes the liquid be completely output during each pumping process, avoids energy loss caused by liquid residue, and avoids the decline of cleaning effect caused by throttling design.

[0103] In one embodiment of the present disclosure, 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 member arranged in the holding portion 200, and the pump assembly 100 and the brush head driving mechanism 600 are both mounted on the mounting member. In this way, the brush head driving mechanism 600 and the pump assembly 100 can be assembled together first, and then the two are assembled as a whole in the holding portion 200. It should be noted that the brush head driving mechanism 600 and the pump assembly 100 will both vibrate when working, so that the connection reliability of the pipeline connecting 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 is poor and is prone to falling off. 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 as a whole, so as to reduce the resonance and improve the stability of the waterway connection.

[0104] Having described above several embodiments of the disclosure, any modifications and variations that fall within the scope of the described embodiments are also contemplated by the inventor(s). As such, the foregoing description is not intended to limit the scope of the disclosure, and it is recognized that modifications are contemplated which can provide one or more benefits and which are within the scope of the disclosure. The 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, and a liquid inlet flow channel (7) and a liquid outlet flow channel (8) formed on the housing (1) and communicating with the pumping cavity (10); the housing (1) comprises a valve plate (11) having a liquid inlet hole (111) and a liquid outlet hole (112) formed therein and separated from each other, the liquid inlet hole (111) communicating with the liquid inlet flow channel (7), and the liquid outlet hole (112) communicating with the liquid outlet flow channel (8); a displacement mechanism (2) connected to the housing (1); the displacement mechanism (2) is provided with a diaphragm (21) on one side thereof facing a first direction, the diaphragm (21) being configured to form the pumping cavity (10) in cooperation with the valve plate (11); liquid from the liquid inlet flow channel (7) is configured to flow into the pumping cavity (10) and flow out through the liquid outlet flow channel (8) under the extrusion of the diaphragm (21) during movement of the displacement mechanism (2) towards the first direction; an eccentric mechanism (3) connected to one side of the displacement mechanism (2) facing 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 first direction and the second direction during rotation; wherein the displacement mechanism (2) is capable of moving to a first limit position along the first direction and a second limit position along the second direction; at least part of the diaphragm (21) is configured to bend towards the first direction when the displacement mechanism (2) is located at the first limit position; a wall surface of the valve plate (11) facing the second direction is configured to be adapted to the shape of the diaphragm (21) when the displacement mechanism (2) is located at the first limit position.

2. The pump assembly of claim 1, wherein, The displacement mechanism (2) further comprises a push-pull piece (22) connected to the eccentric mechanism (3); the push-pull piece (22) is configured to reciprocate along the first direction and the second direction during rotation of the eccentric mechanism (3); the diaphragm (21) is provided with a boss portion (212) protruding towards the second direction; the diaphragm (21) is configured to be connected to the push-pull piece (22) through the boss portion (212); the boss portion (212) is configured to drive part of the diaphragm (21) to bend towards the first direction when the displacement mechanism (2) moves along the first direction.

3. The pump assembly of claim 2, wherein, When the displacement mechanism (2) is located at the first limit position, an end surface of the diaphragm (21) facing the first direction and corresponding to the boss portion (212) is configured to be in contact with the wall surface of the valve plate (11) facing the second direction.

4. The pump assembly of claim 3, wherein, An end surface of the boss portion (212) facing the first direction is configured to be a plane; an area of the wall surface of the valve plate (11) facing the second direction and corresponding to the boss portion (212) is configured to be a plane area (113).

5. The pump assembly of claim 4, wherein, The boss portion (212) is arranged at a central position of the diaphragm (21); a middle position of the wall surface of the valve plate (11) facing the second direction is configured to be a plane area (113).

6. The pump assembly of claim 5, wherein, An arc surface (114) is smoothly connected around the middle planar area on the wall surface of the valve plate (11) facing the second direction; when in the first limit position, part of the diaphragm (21) is configured to bend towards the first direction to fit the arc surface (114).

7. The pump assembly of claim 6, wherein, The center distance between the liquid inlet hole (111) and the liquid outlet hole (112) is in the range of 3-13mm; In the case that the area of the middle plane region (113) of the valve plate (11) is less than or equal to 7mm 2 , the liquid inlet hole (111) and the liquid outlet hole (112) are both arranged on the arc surface (114). In the case where the area of the intermediate planar region (113) of the valve plate (11) is greater than 7 mm 2 and less than 133 mm 2 , at least one of the liquid inlet hole (111) and the liquid outlet hole (112) is arranged on the arc surface (114).

8. The pump assembly of claim 4, wherein, The end surface area of the boss portion (212) toward the first direction is the same as the area of the planar region (113) on the valve plate (11); the area of the planar region (113) on the valve plate (11) is in the range of 19.6-37.7 mm 2 .

9. The pump assembly of claim 3, wherein, The end surface of the diaphragm (21) facing the first direction and corresponding to the boss part (212) is configured as a first arc surface (213); the area on the wall surface of the valve plate (11) facing the second direction and corresponding to the boss part (212) is configured as a second arc surface (115) matching the first arc surface (213); the first arc surface (213) and the second arc surface (115) are configured to bend towards the first direction.

10. The pump assembly of claim 9, wherein, The boss part (212) is arranged at the center position of the diaphragm (21), and the second arc surface (115) is located at the middle area of the wall surface of the valve plate (11) facing the second direction.

11. The pump assembly of claim 10, wherein, An arc surface (114) is smoothly connected around the middle planar area on the wall surface of the valve plate (11) facing the second direction; when in the first limit position, part of the diaphragm (21) is configured to bend towards the first direction to fit the arc surface (114).

12. The pump assembly of claim 2, wherein, When in the second limit position, at least part of the diaphragm (21) is configured to extend 0.5-1mm towards the second direction under the driving action of the push-pull piece (22).

13. The pump assembly of claim 1, wherein, The diameter of the liquid inlet hole (111) is in the range of 1.5-3mm, and / or the diameter of the liquid outlet hole (112) is in the range of 1.5-3mm.

14. The pump assembly of claim 13, wherein, The diameter of the liquid outlet hole (112) is greater than or equal to the diameter of the liquid inlet hole (111).

15. The pump assembly of claim 1, wherein, The volume of the pumping chamber (10) is in the range of 80-300 mm 3 when the displacement mechanism (2) is in the second extreme position.

16. 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 eccentric distance of the eccentric wheel is in the range of 0.5-1.2mm.

17. An oral care 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); the pump assembly (100) according to any one of claims 1-16 is arranged in the holding part (200); the liquid inlet flow channel (7) communicates with the liquid storage tank (300), and the liquid outlet flow channel (8) communicates with the nozzle (400); 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 flow channel (7) and is provided as impact fluid through the liquid outlet flow channel (8).

18. 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) disposed in the handle (200); a brush head driving mechanism (600) configured to drive the brush head (500) to oscillate; The pump assembly (100) according to any one of claims 1 to 16 is disposed in the handle (200); the liquid inlet flow channel (7) is in communication with the liquid storage tank (300), and the liquid outlet flow channel (8) is in communication with the nozzle (400); 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 flow channel (7) and impact fluid is provided through the liquid outlet flow channel (8).

19. The oral care device of claim 18, wherein, The brush head driving mechanism (600) is disposed on an extension of the valve plate (11).

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