Pump assembly and oral care device

Abstract

The utility model relates to a pump assembly and an oral care device. The pump assembly includes a housing, a displacement axis, a displacement mechanism coupled to the housing, an eccentric mechanism, and a drive mechanism coupled to the housing. A pumping cavity is formed in the shell; a diaphragm is arranged on the side, facing the first direction, of the displacement mechanism along the displacement axis, and the diaphragm and part of the inner wall of the shell define a pumping cavity. The eccentric mechanism is arranged in the shell and is in transmission connection with one side, facing the second direction, of the displacement mechanism along the displacement axis; the eccentric mechanism drives the displacement mechanism to reciprocate towards the first direction and the second direction along the displacement axis in the rotating process so as to circularly reduce and increase the volume of the pumping cavity; the displacement mechanism can be driven by the eccentric mechanism to move to a compression position along the displacement axis in the first direction and move to an expansion position along the displacement axis in the second direction. At the expansion position, at least part of the diaphragm forms a curved surface with an opening facing the first direction.

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 flushing 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. CONTENT OF THE UTILITY MODEL

[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 coupled to the housing, the displacement mechanism being provided with a diaphragm on one side of the displacement axis in a first direction, the diaphragm being configured to form the pumping cavity with part of the inner wall of the housing;

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

[0010] a driving mechanism coupled to the housing and drivingly connected to the eccentric mechanism to drive the eccentric mechanism to rotate;

[0011] wherein the displacement mechanism can be driven by the eccentric mechanism to move along the displacement axis in the first direction to a compression position, and to move along the displacement axis in the second direction to an expansion position; at least part of the diaphragm is configured to form a curved surface with an opening facing the first direction when in the expansion position.

[0012] In one embodiment of the present disclosure, the diaphragm has an elastic portion that is deformed under the action of movement transmitted during rotation of the eccentric mechanism; when the displacement mechanism is in a relaxed position between the compressed position and the expanded position, the elastic portion is substantially not deformed.

[0013] In one embodiment of the present disclosure, the distance between the expanded position and the relaxed position along the displacement axis is 0.2-1.5 mm.

[0014] In one embodiment of the present disclosure, the distance between the expanded position and the relaxed position along the displacement axis is 0.4-1.2 mm.

[0015] In one embodiment of the present disclosure, the displacement mechanism includes a push-pull member connected to the eccentric mechanism, and the diaphragm has a connecting portion on one side facing the second direction, which is coupled to the push-pull member; during rotation of the eccentric mechanism, the push-pull member is configured to reciprocate in the first direction and the second direction.

[0016] In one embodiment of the present disclosure, the displacement axis passes through the center of the diaphragm, and / or the displacement axis coincides with the central axis of the push-pull member.

[0017] In one embodiment of the present disclosure, in a plane perpendicular to the displacement axis, the projection of the elastic portion is at least partially located on the outer periphery side of the connecting portion; and / or the projection of the elastic portion is at least partially located on the outer periphery side of the push-pull member.

[0018] In one embodiment of the present disclosure, the housing is provided with a liquid inlet flow channel and a liquid outlet flow channel that 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 movement of the displacement mechanism in the first direction.

[0019] In one embodiment of the present disclosure, the housing includes a valve plate that forms the pumping cavity together with the diaphragm; the valve plate is provided with a liquid inlet hole that communicates with the liquid inlet flow channel and a liquid outlet hole that communicates with the liquid outlet flow channel.

[0020] In one embodiment of the present disclosure, on the side of the valve plate away from the diaphragm, a first one-way valve that communicates with the liquid inlet flow channel is arranged at a position corresponding to the liquid inlet hole, and a second one-way valve that communicates with the liquid outlet flow channel is arranged at a position corresponding to the liquid outlet hole.

[0021] 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.

[0022] 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.

[0023] In one embodiment of the present disclosure, at least part of the diaphragm is configured to bend towards the first direction when in the compressed position; the wall surface of the valve plate towards the second direction is configured to match the shape of the diaphragm when in the compressed position.

[0024] In one embodiment of the present disclosure, the wall surface of the valve plate towards the second direction is at least partially configured as an arc surface.

[0025] In one embodiment of the present disclosure, the middle region of the wall surface of the valve plate towards the second direction is configured as a flat surface; the arc surface is smoothly connected to the outer peripheral side of the flat surface.

[0026] In one embodiment of the present disclosure, the liquid inlet hole and / or the liquid outlet hole is disposed on the arc surface.

[0027] In one embodiment of the present disclosure, when the displacement mechanism is in the expanded position, the volume of the pumping cavity is in the range of 80-300mm 3 .

[0028] In one embodiment of the present disclosure, when the displacement mechanism is in the expanded position, the volume of the pumping cavity is in the range of 100-250mm 3 .

[0029] 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.

[0030] In one embodiment of the present disclosure, the eccentricity of the eccentric wheel is in the range of 0.8-1.2mm.

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

[0032] a handle, one end of the handle being connected with a nozzle;

[0033] a liquid storage tank, disposed in the handle;

[0034] a pump assembly according to the first aspect of the present disclosure, disposed in the handle; a liquid inlet flow channel and a liquid outlet flow channel being formed on the housing of the pump assembly and communicating with the pumping cavity, the liquid storage tank communicating with the liquid inlet flow channel, and the nozzle communicating with the liquid outlet flow channel;

[0035] Under the action of the driving mechanism, the volume of the pumping cavity is configured to periodically increase and decrease, so that the liquid in the liquid tank is pumped into the pumping cavity through the liquid inlet channel and impact fluid is provided through the liquid outlet channel.

[0036] According to a third aspect of the present disclosure, there is also provided an oral care device, comprising:

[0037] a holding portion, one end of the holding portion being connected with a nozzle and a brush head;

[0038] a liquid tank arranged in the holding portion;

[0039] a brush head driving mechanism configured to drive the brush head to swing;

[0040] a pump assembly according to the first aspect of the present disclosure, arranged in the holding portion; a housing of the pump assembly being provided with a liquid inlet channel and a liquid outlet channel in communication with the pumping cavity, the liquid tank being in communication with the liquid inlet channel, and the nozzle being in communication with the liquid outlet channel;

[0041] Under the action of the driving mechanism, the volume of the pumping cavity is configured to periodically increase and decrease, so that the liquid in the liquid tank is pumped into the pumping cavity through the liquid inlet channel and impact fluid is provided through the liquid outlet channel.

[0042] In one embodiment of the present disclosure, the housing of the pump assembly 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; and the brush head driving mechanism is arranged on an extension of the valve plate.

[0043] One beneficial effect of the present disclosure is that, when in the expanded position, at least part of the diaphragm is pre-tensioned to form a curved surface with an opening facing the first direction, thereby improving the resilience of the diaphragm and in turn improving the instantaneous speed of liquid outlet and impact force of the pump assembly. Specifically, the pre-tensioned curved surface allows the diaphragm to have a pre-stretched elastic potential energy reserve, compared to the loose form of the diaphragm in the limit position in the prior art, this curved surface configuration can effectively increase the deformation stroke and resilience of the diaphragm during reciprocating motion, so that the diaphragm can generate stronger restoring force when compressed towards the first direction, thereby accelerating the rate of volume reduction of the pumping cavity. This improvement in instantaneous speed is crucial for scenarios that require pulsed high-pressure fluid output (such as impact water flow in oral care devices), and can form a more impactful fluid jet, effectively enhancing the cleaning or impact effect on the target surface.

[0044] Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments with reference to the drawings. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0046] Figure 1 This is a cross-sectional view of the pump assembly in its expanded position according to an embodiment of this disclosure;

[0047] Figure 2 yes Figure 1 A magnified view of the location of China Mobile's facilities;

[0048] Figure 3 This is a side view of a displacement mechanism provided in an embodiment of this disclosure;

[0049] Figure 4 This is a top view of a displacement mechanism provided in an embodiment of this disclosure;

[0050] Figure 5 This is a schematic diagram of a pump assembly structure provided in an embodiment of this disclosure;

[0051] Figure 6 This is a schematic diagram of a valve plate structure provided in an embodiment of the present disclosure;

[0052] Figure 7 This is a cross-sectional view of a valve plate provided in an embodiment of this disclosure;

[0053] Figure 8 This is a schematic diagram of the structure of an oral care device provided in one embodiment of the present disclosure;

[0054] Figure 9 This is a schematic diagram of the structure of an oral care device provided in another embodiment of this disclosure;

[0055] Figure 10 This is a diagram showing the results of a comparative impact force test according to an embodiment of this disclosure;

[0056] Figure 11 This is a graph showing the results of a comparative test on pumping time provided in an embodiment of this disclosure.

[0057] Figures 1 to 11 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0058] 100, pump assembly; 1, housing; 10, pumping cavity; 11, valve plate; 111, inlet hole; 112, outlet hole; 113, flat surface; 114, arc surface; 2, displacement mechanism; 21, diaphragm; 210, curved surface; 211, elastic part; 212, connecting part; 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; X, displacement axis; X1, first direction; X2, second direction; Z, rotation axis. DETAILED DESCRIPTION

[0059] 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, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present disclosure unless specifically stated otherwise.

[0060] 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.

[0061] 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 specification, where appropriate.

[0062] It should be noted that like reference numerals and letters in the various figures indicate similar items, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

[0063] In this document, "upper", "lower", "front", "rear", "left", "right", and the like, are used to describe relative positions between the relevant parts, and not to limit the absolute positions of the relevant parts.

[0064] In this document, "first", "second", and the like, are used to distinguish between items, and not to indicate importance, order, and the existence of each other.

[0065] 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.

[0066] Embodiment One

[0067] Reference Figure 1The 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 deliver fluid medium. The pump assembly 100 comprises a housing 1, a displacement axis X, a displacement mechanism 2, an eccentric mechanism 3 and a driving mechanism 4. 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 the housing 1 is provided with a pumping cavity 10. In an embodiment of the present disclosure, the housing 1 comprises a valve plate 11 which can be formed integrally with the housing 1 as a part of the structure of the housing 1 or can be a part fixedly mounted on the housing 1.

[0068] Referring to Figure 1 the direction of the view, the transversely extending dashed line in the figure is the displacement axis X, and the left side indicated by the arrow is referred to as a first direction X1 and the right side is referred to as a second direction X2. Referring to Figures 1 to 3 The displacement mechanism 2 is engaged with the housing 1, and the displacement mechanism 2 is provided with a diaphragm 21 on the side facing the first direction X1 along the displacement axis X. The diaphragm 21 is configured to enclose the pumping cavity 10 with part of the inner wall of the housing 1, in particular, the valve plate 11 and the diaphragm 21 enclose the pumping cavity 10, and the volume of the pumping cavity 10 can change during the movement of the displacement mechanism, so that the liquid in the pumping cavity 10 can be pumped out.

[0069] In an embodiment of the present disclosure, referring to Figure 5 The housing 1 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 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 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, so that the fluid can be pumped out from the liquid outlet flow channel 8 by using the pressure.

[0070] The eccentric mechanism 3 is arranged in the housing 1 and is in transmission connection with the side of the displacement mechanism 2 facing the second direction X2 along the displacement axis, and the second direction X2 is opposite to the first direction X1. The eccentric mechanism 3 is configured to drive the displacement mechanism 2 to reciprocate along the displacement axis towards the first direction X1 and the second direction X2 during rotation to cyclically decrease and increase the volume of the pumping cavity 10. In an embodiment of the present disclosure, the eccentric mechanism 3 is an eccentric wheel which is configured to have a rotation axis Z deviating from the geometric center thereof.

[0071] In one 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 (preferably 0.8-1.2mm), which significantly reduces the reciprocating stroke of the displacement mechanism 2 driven by the eccentric wheel when rotating, 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 throttling and water saving.

[0072] 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 its geometric center, 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 middle. As shown, Figure 1 the driving shaft 41 penetrates the shaft hole, and when the driving mechanism 4 is working, the driving shaft 41 can drive the eccentric wheel to rotate around the rotation axis Z.

[0073] 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.

[0074] In one embodiment of the present disclosure, as 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 direction of the displacement axis X.

[0075] In one embodiment of the present disclosure, with reference to Figures 2 to 4 , the displacement mechanism 2 comprises a push-pull piece 22 connected with the eccentric mechanism 3, and the diaphragm 21 has a connecting portion 212 coupled to the push-pull piece 22 on the side facing the second direction X2; 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 facing the second direction X2 can be fixedly connected to the connecting rod 5, and the other end facing the first direction X1 can be connected with the connecting 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 connecting portion 212, so as to periodically increase and decrease the volume of the pumping cavity 10.

[0076] In one specific embodiment of the present disclosure, as Figure 3 shown, the displacement axis X passes through the center of the diaphragm 21, and / or the displacement axis X coincides with the central axis of the push-pull piece 22. 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 the 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 X, so as to promote the diaphragm 21 to symmetrically deform around the displacement axis X during the reciprocating motion along 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] The displacement mechanism 2 can be driven by the eccentric mechanism 3 to move along the displacement axis X to a compression position in a first direction X1 and to an expansion position in a second direction X2. Specifically, when the displacement mechanism 2 is driven by the eccentric mechanism 3 to move in the first direction X1, the volume of the pumping cavity 10 decreases, and when the volume of the pumping cavity 10 decreases to a limit position, the displacement mechanism 2 is in the compression position; when the displacement mechanism 2 is driven by the eccentric mechanism 3 to move in the second direction X2, the volume of the pumping cavity 10 increases, and when the volume of the pumping cavity 10 increases to a 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 in the first direction X1, the diaphragm 21 exerts a squeezing action on the liquid in the pumping cavity 10, so that the fluid with a certain impact can be pumped out from the liquid outlet flow channel 8.

[0078] 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 making the pump assembly 100 have a stronger throttling effect and enabling the size of the pump assembly 100 to be reduced as a whole, so that it can be applied to a micro device. 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, so that the volume of the pumping cavity 10 can be adaptively reduced, thereby improving the throttling and water-saving effect.

[0079] In one embodiment of the present disclosure, referring to Figure 4 , the diaphragm 21 has an elastic portion 211 that can be deformed under the action of the movement transmitted during the rotation of the eccentric mechanism 3. It can be understood that, in addition to the elastic portion 211 that can be deformed, the diaphragm 21 also has a region that cannot be deformed, for example, the diaphragm 21 also includes a portion for engaging with the housing 1, which can be integrally formed with the elastic portion 211 to form the diaphragm 21, but cannot be deformed under the action of external force. As shown in Figure 3 , when the displacement mechanism 2 is in a relaxed position between the compression position and the expansion position, the elastic portion 211 is basically not deformed. As described above, the compression position and the expansion position are two limit positions that the diaphragm 21 can reach along the displacement axis X, and there is a relaxed position between the compression position and the expansion position. When the displacement mechanism 2 is in the relaxed position, the elastic portion 211 is basically not subjected to external force, and thus is basically flat and does not deform.

[0080] Referring to Figure 1 and Figure 2When in the expanded position, at least a portion of the diaphragm 21 is configured to form a curved surface 210 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 portion 211 follows the eccentric mechanism 3 to move in the second direction X2. When the displacement mechanism 2 reaches the expanded position, the elastic portion 211 reaches its maximum deformation, thereby forming the curved surface 210 with an opening facing the first direction X1.

[0081] This disclosure enhances the resilience of the diaphragm 21 by pre-stretching at least a portion of the diaphragm 21 in the expanded position to form a curved surface 210 with an opening facing the first direction X1, thereby increasing the instantaneous discharge velocity and impact force of the pump assembly 100. Specifically, the pre-stretched curved surface 210 allows the diaphragm 21 to possess a pre-stretched elastic potential energy reserve. Compared to the prior art where the diaphragm 21 remains relaxed at its extreme position, this curved surface 210 structure effectively increases the deformation stroke and resilience of the diaphragm 21 during reciprocating motion. This allows the diaphragm 21 to generate a stronger restoring force when compressed towards the first direction X1, thereby accelerating the rate at which the pumping chamber 10 decreases in volume. This increase in instantaneous velocity is crucial for scenarios requiring pulsed high-pressure fluid output (such as the impact water flow of oral care devices), as it can form a more impactful fluid jet, effectively enhancing the cleaning or impact effect on the target surface.

[0082] In one specific embodiment of this disclosure, the distance between the expansion position and the loosening position along the displacement axis X is 0.2-1.5 mm. More preferably, the distance between the expansion position and the loosening position along the displacement axis X is 0.4-1.2 mm. In this embodiment, as... Figure 2 As shown, the distance between the expanded position and the relaxed position can be 0.8 mm. This distance is the maximum distance by which the elastic part 211 deforms in the second direction X2, which is also the pre-stretch distance of the diaphragm 21. This disclosure achieves precise control over the degree of deformation of the elastic part 211 of the diaphragm 21, thereby achieving an optimized balance between the fluid output performance and mechanical reliability of the pump assembly 100. This distance parameter directly corresponds to the deformation of the elastic part 211 of the diaphragm 21 from its naturally stretched state (relaxed position) to its pre-stretched state (expanded position), ensuring that the elastic part 211 stores sufficient elastic potential energy during reciprocating motion while avoiding material fatigue or stress concentration due to excessive stretching.

[0083] 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 the 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 deformation range of the diaphragm 21 to the efficient interval. This ensures that the pumping chamber 10 can generate sufficient instantaneous pressure to form impact fluid during the compression phase, and by limiting the maximum volume change, the volume of liquid pumped in a single stroke is controlled within a reasonable range. Compared with the prior art, the pump assembly 100 of the present disclosure can effectively reduce 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.

[0084] In an embodiment of the present disclosure, the projection of the elastic portion 211 is at least partially located on the outer circumferential side of the connecting 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 in a plane perpendicular to the displacement axis X. When the push-pull piece 22 drives the diaphragm 21 to move through the connecting 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. The structure of the displacement mechanism 2 of the present disclosure enhances the pre-tensioning stiffness of the diaphragm 21 at the expanded position. In addition, through the energy storage effect of the outer circumferential elastic portion 211, the diaphragm 21 can generate a stronger rebound force during compression, thereby pushing the liquid in the pumping chamber 10 to be discharged at a higher instantaneous speed, improving the impact force of the fluid.

[0085] In an embodiment of the present disclosure, referring to Figure 5 and Figure 6 , the valve plate 11 is provided with a liquid inlet hole 111 corresponding to the liquid inlet channel 7 and a liquid outlet hole 112 corresponding to the liquid outlet channel 8. 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 first one-way valve 70 and the liquid inlet hole 111, 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.

[0086] 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 small eccentricity and a pump cavity 10 size, thus effectively reducing the water consumption per unit time, and 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, which not only adapts to the change range of the pump cavity 10 volume caused by the small eccentricity, avoids the loss of flow control caused by too large aperture or the increase of flow resistance caused by too 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.

[0087] On this basis, the present disclosure further specifies that the diameter of the liquid outlet hole 112 is greater than or equal to the diameter of the liquid inlet hole 111. When the displacement mechanism 2 drives the diaphragm 21 to extrude the pump cavity, the larger liquid outlet hole 112 can reduce the fluid resistance, so that the liquid is discharged at a higher speed under the instantaneous extrusion action of the diaphragm 21, avoiding the pressure retention or flow loss caused by the aperture bottleneck. Preferably, when the diameters of the liquid outlet hole 112 and the liquid inlet hole 111 are equal, 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.

[0088] In one embodiment of the present disclosure, referring to Figure 6 and Figure 7 , at least part of the diaphragm 21 is configured to bend towards the first direction X1 when in the compression position, and the wall surface of the valve plate 11 towards the second direction X2 is configured to match the shape of the diaphragm 21 when in the compression position. When the diaphragm 21 is driven by the push-pull piece 22 to bend towards the first direction X1 to the compression position, the bending profile thereof completely matches the wall surface of the valve plate 11 towards the second direction X2, thereby eliminating the dead space between the inner wall of the pump cavity 10 and the diaphragm 21, so that the liquid in the pump 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.

[0089] Specifically, the wall surface of the valve plate 11 facing the second direction X2 is at least partially configured as an arc surface 114, and in addition, the middle region of the wall surface of the valve plate 11 facing the second direction X2 is configured as a flat surface 113, and the arc surface 114 is smoothly connected to the outer peripheral side of the flat surface 113. When in the compressed position, the connecting portion 212 region on the diaphragm 21 does not deform, and the elastic portion 211 located on the outer peripheral side of the connecting portion 212 can bend towards the first direction X1; wherein the flat surface 113 region on the valve plate 11 is arranged corresponding to the connecting portion 212 of the diaphragm 21, and the arc surface 114 region 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 facing the second direction X2 is adapted to the shape of the diaphragm 21 when in the compressed position, so that the liquid in the pumping cavity 10 is completely squeezed out during the compression stroke.

[0090] In one specific 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, a first one-way valve 70 and a second one-way valve 80 are respectively 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, and if the holes are arranged in the middle flat surface 113 region, the valve arrangement 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 on the outer periphery, thereby utilizing the radial space naturally formed by the curvature of the wall surface to provide a structural basis for the miniaturization design of the pump assembly 100.

[0091] Embodiment Two

[0092] 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 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.

[0093] Reference Figure 8 The oral care device provided in the present embodiment comprises a holding portion 200, a liquid storage tank 300, and a pump assembly 100. The holding portion 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 holding portion 200. The pump assembly 100 and the liquid storage tank 300 are both arranged inside the holding portion 200, and a circuit board, a pipeline, and other structures can also be arranged inside the holding portion 200.

[0094] 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 communicate with the pumping cavity 10. One end of the holding portion 200 is connected with a nozzle 400, and the nozzle 400 communicates 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, thereby realizing the function of flushing the interdental space.

[0095] 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 flow 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 flow channel 7, and the impact fluid is provided through the liquid outlet flow channel 8.

[0096] 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. 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, and the user does not need to frequently refill water during the rinsing process. The volume of the liquid storage tank 300 can be more miniaturized, reducing the volume of the oral care device, making the oral care device more suitable for holding and more portable. In addition, the present disclosure pre-tenses at least part of the diaphragm 21 in the expanded position to form a curved surface 210 with an opening facing the first direction X1, thereby improving the resilience of the diaphragm 21, and further improving the instantaneous speed of the liquid outlet of the pump assembly 100 and the impact force, avoiding the decline in cleaning effect caused by the throttling design.

[0097] Embodiment three

[0098] The 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 embodiment. The difference between the 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.

[0099] Reference Figure 9 The oral care device provided in the embodiment includes a holding portion 200, a liquid storage tank 300, a brush head driving mechanism 600, and a pump assembly 100. The holding portion 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 portion 200, and a circuit board, a pipeline, and other structures can also be arranged in the holding portion 200.

[0100] 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 side of the 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.

[0101] 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 vibration motor (such as a sonic motor) capable of high-frequency swinging of the brush head 500. 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 the electric toothbrush, but also has the flushing function of the oral irrigator, so as to improve the user experience and improve the cleaning effect of the oral cleaner.

[0102] The liquid storage tank 300 is arranged in the holding portion 200, and the liquid storage tank 300 is used for storing 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.

[0103] 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 oral irrigator 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.

[0104] 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 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, and the user does not need to frequently supplement water during flushing. In addition, the disclosure pre-stretches at least part of the diaphragm 21 in the expanded position to form a curved surface 210 with the opening facing the first direction X1, thereby improving the resilience of the diaphragm 21, and further improving the instantaneous speed and impact force of the liquid outflow of the pump assembly 100, avoiding the decline in cleaning effect caused by the throttling design.

[0105] In one embodiment of the 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, and 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 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 assembled as a whole in the holding portion 200.

[0106] 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 connected between the liquid outlet channel 8 of the pump assembly 100 and the hollow flow channel of the output shaft of the brush head driving mechanism 600 is poor, and is prone to falling off. In view of 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 condition and improve the stability of the waterway connection.

[0107] Embodiment four

[0108] 1. Pump assembly impact force comparison test

[0109] 1.1. Test purpose: To verify the effect of the pump assembly provided in embodiment one on the fluid impact force by pre-stretching the diaphragm and optimizing the eccentricity.

[0110] 1.2. Test device

[0111] No. 1 pump: comparative pump body, using an eccentric wheel with a conventional parameter eccentricity of the prior art, and the diaphragm is not provided with a pre-stretching structure (i.e. the distance between the expanded position and the relaxed position is 0 mm).

[0112] Pump No. 2: Test example pump body, using the pump assembly provided in Example 1, specifically using an eccentric wheel with an eccentricity in the range of 0.5-1.2, and a diaphragm with a pre-stretching distance in the range of 0.2-1.5 mm.

[0113] Impact force test platform: containing pressure sensor (accuracy ±0.1 g), fluid pipeline and data acquisition system.

[0114] 1.3, Test method:

[0115] Two pump assemblies were connected to the same fluid circuit, the liquid tank was filled with 200 ml of deionized water, and the driving mechanism was set to the same speed.

[0116] Start the pump assembly, when the displacement mechanism runs to the compression position, collect the instantaneous impact force peak value at the outlet of the outlet flow channel through the pressure sensor, and repeat the test 10 times for each sample to take the average value.

[0117] 1.4, Test results: Reference Figure 10 , the impact force peak value of No. 1 pump is 8.7 g, and the impact force peak value of No. 2 pump is 9.3 g, and the impact force performance improvement rate is 6.8%. It can be seen that the pump assembly provided in Example 1 reduces the eccentricity and cooperates with the diaphragm pre-stretching design, so that the diaphragm generates stronger elastic recovery force during the compression stroke, the liquid extrusion rate of the pumping cavity is improved, and the final impact force is improved by 6.8% compared with the traditional large eccentricity design.

[0118] 2, Pump assembly water pumping time comparison test

[0119] 2.1, Test purpose: To verify the water-saving performance optimization effect of the pump assembly provided in Example 1 through diaphragm pre-stretching, eccentricity optimization and other designs.

[0120] 2.2, Test device

[0121] Pump No. 1: Comparative example pump body, using an eccentric wheel with an eccentricity of a conventional parameter of the prior art, and the diaphragm is not provided with a pre-stretching structure (i.e. the distance between the expansion position and the relaxation position is 0 mm).

[0122] Pump No. 2: Test example pump body, using the pump assembly provided in Example 1, specifically using an eccentric wheel with an eccentricity in the range of 0.5-1.2, and a diaphragm with a pre-stretching distance in the range of 0.2-1.5 mm.

[0123] Measuring cylinder (200 ml range, accuracy ±1 ml) and timing device (accuracy 0.1 seconds).

[0124] 2.3, Test method:

[0125] At the same driving speed, the time for two pump assemblies to pump 200ml water in the cylinder was tested. Among them, the "pumping dry time" is defined as the time from starting the pump assembly to no liquid flowing out of the liquid flow channel, and each sample is repeated 5 times to take the average value.

[0126] 2.4, Test results: reference Figure 11 The pumping dry time of No. 1 pump is 62 seconds, and the pumping dry time of No. 2 pump is 67 seconds, which effectively prolongs the pumping time and improves the water saving performance by 8%. It can be seen that the pump assembly provided in Example One reduces the eccentricity and cooperates with the pre-stretching design of the diaphragm, reduces the volume change per unit time in the pumping chamber, reduces the liquid pumped out at a time, and significantly reduces the water consumption per unit time under the premise of maintaining the effective impact force.

[0127] The above has described various embodiments of the present disclosure, and 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 choice 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) coupled to the housing (1) and provided with a diaphragm (21) on one side of the displacement mechanism (2) along the displacement axis in a first direction, the diaphragm (21) being configured to form the pumping cavity (10) with a part of the inner wall of 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 mechanism (2) along the displacement axis in a second direction opposite to the first direction, the eccentric mechanism (3) being configured to 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); a driving mechanism (4) coupled to the housing (1) and drivingly connected to the eccentric mechanism (3) to drive the eccentric mechanism (3) to rotate; wherein the displacement mechanism (2) is driven by the eccentric mechanism (3) to move along the displacement axis in the first direction to a compression position and to move along the displacement axis in the second direction to an expansion position, and at least part of the diaphragm (21) is configured to form a curved surface (210) with an opening facing the first direction when the displacement mechanism (2) is in the expansion position.

2. The pump assembly of claim 1, wherein, The diaphragm (21) has an elastic portion (211) capable of deforming under the action of the motion transmitted by the eccentric mechanism (3) during rotation, and the elastic portion (211) is substantially not deformed when the displacement mechanism (2) is in a relaxed position between the compression position and the expansion position.

3. The pump assembly of claim 2, wherein, The distance between the expansion position and the relaxed position along the displacement axis is 0.2-1.5mm.

4. The pump assembly of claim 3, wherein, The distance between the expansion position and the relaxed position along the displacement axis is 0.4-1.2mm.

5. The pump assembly of claim 2, wherein, The displacement mechanism (2) comprises a push-pull piece (22) connected to the eccentric mechanism (3), and the diaphragm (21) has a connecting portion (212) coupled to the push-pull piece (22) on one side of the diaphragm (21) in the second direction, and the push-pull piece (22) is configured to reciprocate in the first direction and the second direction during rotation of the eccentric mechanism (3).

6. The pump assembly of claim 5, wherein, The displacement axis passes through the center of the diaphragm (21), and / or the displacement axis coincides with the central axis of the push-pull piece (22).

7. The pump assembly of claim 5, wherein, In a plane perpendicular to the displacement axis, the projection of the elastic portion (211) is at least partially located on the outer periphery side of the connecting portion (212), and / or the projection of the elastic portion (211) is at least partially located on the outer periphery side of the push-pull piece (22).

8. 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 movement of the displacement mechanism (2) in the first direction.

9. The pump assembly of claim 8, 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) corresponding to the liquid inlet channel (7) and a liquid outlet hole (112) corresponding to the liquid outlet channel (8).

10. The pump assembly of claim 9, wherein, 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).

11. The pump assembly of claim 9, 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.

12. The pump assembly of claim 11, wherein, The diameter of the liquid outlet hole (112) is greater than or equal to the diameter of the liquid inlet hole (111).

13. The pump assembly of claim 9, wherein, When in the compression position, at least part of the diaphragm (21) is configured to bend towards the first direction; the wall surface of the valve plate (11) towards the second direction is configured to match the shape of the diaphragm (21) when in the compression position.

14. The pump assembly of claim 13, wherein, The wall surface of the valve plate (11) towards the second direction is at least partially configured as an arc surface (114).

15. The pump assembly of claim 14, wherein, The middle region of the wall surface of the valve plate (11) towards the second direction is configured as a flat surface (113); the arc surface (114) is smoothly connected to the outer peripheral side of the flat surface (113).

16. The pump assembly of claim 14, wherein, The liquid inlet hole (111) and / or the liquid outlet hole (112) are arranged on the arc surface (114).

17. 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 expanded position.

18. The pump assembly of claim 17, wherein, The volume of the pumping chamber (10) is in the range of 100-250 mm 3 when the displacement mechanism (2) is in the expanded position.

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

20. The pump assembly of claim 19, wherein, The eccentricity of the eccentric wheel is in the range of 0.8-1.2mm.

21. An oral care device characterized by, Comprising: 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 to 20 arranged in the holding part (200); the shell (1) of the pump assembly (100) is provided with a liquid inlet channel (7) and a liquid outlet channel (8) communicating with the pumping cavity (10), the liquid storage tank (300) communicates with the liquid inlet channel (7), and the nozzle (400) communicates with the liquid outlet channel (8); 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 provided as an impact fluid through the liquid outlet channel (8).

22. An oral treatment device, characterized by Comprising: 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 pump assembly (100) according to any one of claims 1 to 20 arranged in the holding part (200); the shell (1) of the pump assembly (100) is provided with a liquid inlet channel (7) and a liquid outlet channel (8) communicating with the pumping cavity (10), the liquid storage tank (300) communicates with the liquid inlet channel (7), and the nozzle (400) communicates with the liquid outlet channel (8); 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 provided as an impact fluid through the liquid outlet channel (8). 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 20 is arranged in the holding part (200); a housing (1) of the pump assembly (100) is provided with an inlet flow channel (7) and an outlet flow channel (8) in communication with the pumping cavity (10); the liquid storage tank (300) is in communication with the inlet flow channel (7); and the nozzle (400) is in communication with the outlet flow channel (8). 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 inlet flow channel (7) and impact fluid is provided through the outlet flow channel (8).

23. The oral care device of claim 22, wherein, The housing (1) of the pump assembly (100) comprises a valve plate (11), the valve plate (11) and the diaphragm (21) form the pumping cavity (10); the valve plate (11) is provided with an inlet hole (111) in communication with the inlet flow channel (7) and an outlet hole (112) in communication with the outlet flow channel (8); and the brush head driving mechanism (600) is arranged on an extension of the valve plate (11).

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