Casing for oral cavity cleaning and oral cavity cleaning device

Abstract

The invention discloses a machine shell for oral cavity cleaning and an oral cavity cleaning device, the machine shell comprises a shell body and a cover body, the shell body is provided with an opening, and the cover body covers the opening of the shell body; the cover body and the shell are mutually nested in a preset direction, and a liquid storage cavity is defined by the cover body and the shell; a micro-channel is formed between the shell and the cover body; the micro-channel can allow gas to penetrate in the preset direction and prevent liquid from flowing out, and the micro-channel communicates the liquid storage cavity with the outside through an assembly gap between the shell and the cover. The casing for oral cavity cleaning and the oral cavity cleaning device have the effects of being free of holes in appearance, breathable and waterproof.

Description

Technical Field

[0001] This application relates to the field of oral hygiene appliance technology, and in particular to a housing and oral hygiene device for oral hygiene. Background Technology

[0002] With increasing emphasis on oral hygiene, electric toothbrushes and water flossers have gradually become common household oral care tools. Electric toothbrushes use a motor to vibrate the brush head at high frequencies, instantly breaking down toothpaste into fine foam for deep cleaning between teeth. Water flossers use a pump to deliver a high-pressure jet of water, using the impact force of the water jet to clean teeth and between teeth.

[0003] The relevant oral irrigator combines toothbrush and water flossing functions. Specifically, the oral irrigator may include a body, a toothbrush, a motor, a water pump, and a water tank. The toothbrush is located at the head of the body, while the motor, water pump, and water tank are housed inside the body. The motor's output shaft has a flow channel for water flow, and this flow channel communicates with the water tank. The toothbrush has a cavity and an outlet communicating with the cavity. The motor's output shaft passes through the cavity, and the flow channel of the motor's output shaft communicates with the outlet, allowing liquid in the water tank to be ejected from the outlet through the flow channel under the action of the water pump.

[0004] Oral irrigators typically have vents in their water tanks to allow airflow during pump operation. However, these vents are sometimes located on the exterior surface of the device, posing a risk of blockage and interference with pump operation when the user holds the device. Summary of the Invention

[0005] The purpose of this application is to provide a housing and oral cleaning device for oral cleaning, which can achieve a hidden vent design by utilizing the micro-structure of the sealed cover while taking into account the appearance design. This solves the problem that when the user holds the device, the exposed vent will be blocked, affecting the operation of the water pump, and at the same time, there is no need to increase the design cost of additional internal ventilation pipes.

[0006] To achieve the above objectives, one aspect of this application provides a housing for oral cleaning, including a shell and a cover. The shell has an opening, and the cover seals the opening of the shell. The cover and the shell are nested together along a predetermined direction, and the cover and the shell define a liquid storage cavity. A microchannel is formed between the shell and the cover. The microchannel allows gas to pass through along the predetermined direction and blocks liquid from flowing out. The microchannel connects the liquid storage cavity to the outside through the assembly gap between the shell and the cover.

[0007] The oral cleaning device provided in this application embodiment involves a cover that is inserted into and seals the opening of the housing. The cover and the housing, which is higher than the cover, form a liquid storage cavity. A microchannel is formed between the outer surface of the cover and the inner wall of the housing. This microchannel communicates with the outside via the assembly gap between the cover and the housing, concealing the gas flow path inside the housing to avoid blocking the gas flow and facilitating ventilation. Furthermore, the small pore size of the microchannel allows gas flow while preventing liquid outflow under the combined effects of external atmospheric pressure and negative pressure within the liquid storage cavity, thus achieving both ventilation and leak prevention.

[0008] Optionally, one of the housing and the cover has a sealing groove on its side wall, the sealing groove having an opening facing outward; the other side wall of the housing and the cover, together with the sealing groove, forms a sealing cavity, the sealing cavity communicating with the liquid storage cavity and the outside through the assembly gap, the bottom wall of the sealing groove has an airflow groove, the airflow groove having an opening facing the sealing cavity; the housing also includes a sealing element, the sealing element being clamped between the inner side wall of the other housing and the cover and the bottom wall of the sealing groove, and the surface of the sealing element near the airflow groove forms the microchannel between the airflow groove and the surface of the sealing element.

[0009] Optionally, in the preset direction, the liquid level difference h formed by the highest liquid level in the liquid storage cavity and the height of the horizontal plane where the airflow channel is located satisfies the following condition: 0 < ρ * g * h ≤ 30% * Po; where ρ represents air density; g represents liquid density; and Po represents one atmosphere of pressure.

[0010] Optionally, the height difference h satisfies the following condition: 0 < ρ * g * h ≤ 20% * Po.

[0011] Optionally, the height difference h satisfies the following condition: 0 < ρ * g * h ≤ 10% * Po.

[0012] Optionally, the depth of the airflow groove is between 0.1 mm and 0.4 mm.

[0013] Optionally, the depth of the airflow groove is between 0.25 mm and 0.35 mm.

[0014] Optionally, the sealing groove has a bottom wall and two side walls, the two side walls being connected to both sides of the bottom wall along the preset direction; in the preset direction, the height of the sealing element is less than the height of the bottom wall.

[0015] Optionally, the airflow channel extends through the bottom wall of the channel along the preset direction.

[0016] Optionally, the sealing groove has a bottom wall and two side walls, the two side walls being connected to both sides of the bottom wall extending along the side wall of the cover; each of the two inner side walls is provided with a guide groove, the guide groove having an opening facing the sealing cavity, and a channel for gas to flow through is formed between the guide groove and the sealing element, the channel being in communication with the microchannel; the gas entering the sealing cavity flows out of the sealing cavity after circulating around the sealing element for at least half a circumference through the channel and the microchannel.

[0017] Optionally, the guide channel extends through the sidewall of the channel in a direction perpendicular to the bottom wall of the channel.

[0018] Optionally, the circumferential length of the airflow groove is shorter than the circumferential length of the sealing groove.

[0019] Another aspect of this application provides an oral cleaning device, including a pump mechanism, a cleaning attachment, and a housing for oral cleaning as described above. The pump mechanism is disposed in the inner cavity of the housing. The cleaning attachment has a communicating cavity and an outlet. The cavity of the cleaning attachment is connected to the liquid outlet of the pump mechanism. The pump mechanism pumps liquid from the liquid storage cavity into the cavity of the cleaning attachment and out through the outlet. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 Here is a schematic diagram of a related oral hygiene device;

[0022] Figure 2 A schematic diagram of an oral cleaner provided in an embodiment of this application;

[0023] Figure 3 for Figure 2 A longitudinal sectional view of the oral cleaner is shown;

[0024] Figure 4 for Figure 2 A partial view of another longitudinal section of the oral cleaner is shown;

[0025] Figure 5 An internal layout diagram of an oral cleaning device provided in an embodiment of this application;

[0026] Figure 6 Another internal layout diagram of the oral cleaning device provided in the embodiments of this application;

[0027] Figure 7 for Figure 4 A cross-sectional view of the partition shown;

[0028] Figure 8 A partial cross-sectional view of a housing at the airflow slot provided in an embodiment of this application;

[0029] Figure 9 A partial cross-sectional view of another housing at the airflow slot provided in an embodiment of this application;

[0030] Figure 10 This is a partial cross-sectional view of the housing in a non-airflow slot area provided in an embodiment of this application;

[0031] Figure 11 A schematic diagram of the cover and the third sealing ring provided in an embodiment of this application;

[0032] Figure 12 An exploded view of the oral cleaner provided in the embodiments of this application;

[0033] Figure 13 for Figure 12 An exploded view of the motor, connectors, mounting components, and circuit board is shown.

[0034] Figure 14 for Figure 13 An assembly perspective view showing the mounting components, connectors, and pump mechanism;

[0035] Figure 15 Exploded views of the connector, mounting components, and motor of the oral cleaner provided in the embodiments of this application;

[0036] Figure 16 for Figure 15 An exploded view of the pump mechanism, mounting components, and connectors is shown.

[0037] Figure 17 for Figure 3 Partial schematic diagram;

[0038] Figure 18 An exploded view of a connector provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1000. Oral hygiene device;

[0041] 100. Housing; 110. Power chamber; 120. Liquid storage chamber; 130. Shell; 131. Second mating surface; 140. Cover; 141. Third sealing groove; 142. Third sealing cavity; 143. Airflow groove; 144. Guide groove; 145. First mating surface; 160. Top end; 170. Bottom end; 180. Microchannel; 190. Assembly gap;

[0042] 200, Motor; 210, Output shaft; 211, First flow channel; 220, Motor body;

[0043] 300. Pump mechanism; 310. Inlet end; 311. First valve section; 312. First end cover section; 320. Outlet end; 321. Second valve section; 322. Second end cover section; 330. Power end; 331. Pump housing; 332. Piston; 333. Drive component;

[0044] 400. Connector; 410. Second flow channel; 411. First flow section; 412. Second flow section; 4121. First arc segment; 4122. Second arc segment; 420. Third flow channel; 430. First connecting part; 431. Reversing cavity; 432. First inner arc surface; 440. Second connecting part; 441. Second inner arc surface; 442. Cover plate section; 443. Protruding section; 444. Baffle section; 450. Mounting groove;

[0045] 500. Mounting component; 510. First mounting part; 520. Second mounting part; 530. Through hole;

[0046] 600, partition; 610, receiving cavity; 620, receiving port; 630, first part; 640, second part; 650, third part; 651, fourth flow channel; 660, fourth part; 670, fifth part; 680, connecting hole;

[0047] 710. Energy source; 720. Circuit board;

[0048] 810. First seal; 820. Second seal; 830. Third seal; 840. Fourth seal;

[0049] 911. First vibration damper; 912. Second vibration damper; 913. Third vibration damper; 914. Fourth vibration damper;

[0050] 921. First fastener; 922. Second fastener; 923. Third fastener;

[0051] 2000, Cleaning attachment; 2100, Brush body; 2200, Cavity; 2300, Outlet. Detailed Implementation

[0052] Figure 1This is a schematic diagram of a related oral hygiene device. (Reference) Figure 1 The oral irrigator has a long and slender design, with the water tank located on the right side and the motor, water pump, and battery on the left. The water tank's longitudinal length is almost equal to the longitudinal length of the device, and its small opening makes it difficult for users to clean the inner walls. Furthermore, the water pump is positioned in the middle left of the device, with its input end (a) and output end (b) located at the top. This results in an excessively long longitudinal distance between the pump's input end (a) and the bottom of the water tank, leading to a long water path and hindering the pump's ability to draw liquid from the tank.

[0053] To address the aforementioned technical problems, the inventors of this application conceived of placing the water tank at the bottom of the machine body, and the motor, water pump, etc., above the water tank, thereby shortening the longitudinal length of the water tank for easier cleaning; it also reduces the lateral width of the machine body for easier gripping by the user. However, this arrangement reduces the water tank's volume. To maximize the water tank's volume, the inventors attempted to shorten the longitudinal length of the water pump. Specifically, the water pump's input and output ends can be moved from being located above the pump to being located on the lower side of the pump. This not only increases the longitudinal depth of the submerged water tank but also shortens the distance between the pump's input end and the bottom of the water tank, improving the pump's suction effect. Furthermore, a reversing water path can be installed in the space on the side of the pump, allowing the output end of the pump located on the lower side to connect with the flow channel of the motor's output shaft located above. Thus, while maintaining a slim machine body appearance, the rational layout of the water tank, water pump, and motor not only increases the volume of the submerged water tank but also improves the pump's suction effect.

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0055] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0056] Figure 2 This is a schematic diagram of an oral cleaner provided in an embodiment of this application. Figure 3 for Figure 2 A longitudinal sectional view of the oral cleaner is shown. (Reference) Figure 2 and Figure 3The oral cleaning device provided in this application embodiment may include an oral cleaning device 1000 and a cleaning accessory 2000, wherein the cleaning accessory 2000 may be a toothbrush head, a rinsing head, a rinsing head, or other devices capable of cleaning the oral cavity. Figure 3 The cleaning attachment 2000 is shown as an example of an integrated rinsing head. The cleaning attachment 2000 may include a brush body 2100, and the brush body 2100 may have a cavity 2200 and an outlet 2300 communicating with the cavity 2200.

[0057] Continue to refer to Figure 3 The oral cleaning device 1000 may include a housing 100, a power assembly, and a connector 400. For ease of gripping, the housing 100 may be shaped like a slender cylinder. The cross-sectional shape of the housing 100 may be circular or non-circular (e.g., D-shaped, elliptical, polygonal, etc.). The first axis is the centerline of the housing 100; that is, the center point of each cross-section of the housing 100 may lie on the first axis. The housing 100 may be positioned along the direction of the first axis (e.g., ...). Figure 3 The housing 100 extends in the vertical direction and may have a top end 160 and a bottom end 170 disposed opposite each other along the first axis direction. The interior of the housing 100 may be hollow so that the housing 100 may have an inner cavity.

[0058] The power assembly can be housed within the cavity of the housing 100, and the power assembly may include a motor 200 and a pump mechanism 300. To maintain the elongated shape of the housing 100, the motor 200 and the pump mechanism 300 may be arranged sequentially along a first axis. The motor 200 may be positioned closer to the top 160 of the housing 100 than the pump mechanism 300 (e.g.,...). Figure 3 The motor 200 is located above the pump mechanism 300, so that the output shaft 210 of the motor 200 can pass through the top end 160 of the housing 100 and connect to the cleaning accessory 2000 (such as a toothbrush head, a flushing head, or other accessories with bristles) to drive the cleaning accessory 2000 to move. The motor 200 can be a rotary motor 200 capable of rotating the cleaning accessory 2000; or, the motor 200 can be a vibrating motor 200 capable of causing the cleaning accessory 2000 to oscillate at high frequency (such as a sonic motor 200). The motor 200 may include a motor body 220 and an output shaft 210. The axis of the output shaft 210 may coincide with or be spaced apart from the first axis of the housing 100. The output shaft 210 may pass through the motor body 220 along its axial direction. The top end 160 of the output shaft 210 may pass through the top end 160 of the motor body 220 and connect to the cleaning accessory 2000 to drive the cleaning accessory 2000 to move.

[0059] The output shaft 210 may have a first flow channel 211 extending through it along its axial direction. The inner cavity of the housing 100 may include a liquid storage chamber 120 for storing liquid. Figure 4 for Figure 2 A partial view of another longitudinal section of the oral cleaner is shown. (Reference) Figure 3 and Figure 4 The connector 400 may have a second flow channel 410 and a third flow channel 420. It should be noted that the third flow channel 420 and the second flow channel 410 are not on the same longitudinal section; therefore, from... Figure 3 The cross-section shown reveals the second flow channel 410, from Figure 4 The third flow channel 420 can be seen.

[0060] The third flow channel 420 can connect the liquid storage chamber 120 to the inlet end 310 of the pump mechanism 300, and the second flow channel 410 can connect the outlet end 320 of the pump mechanism 300 to the first flow channel 211. When the cleaning accessory 2000 is an accessory such as a flushing head or a rinsing head that has a cavity 2200 and an outlet 2300 connected to the cavity 2200, and can spray liquid from the outlet 2300, the first flow channel 211 of the output shaft 210 can be connected to the outlet 2300 through the cavity 2200 of the cleaning accessory 2000. Figure 3 and Figure 4 The arrows in the diagram indicate the direction of liquid flow. (Refer to...) Figure 3 and Figure 4 As indicated by the arrow, when the oral irrigator performs its rinsing function, the pump mechanism 300 guides the liquid in the storage chamber 120 through the third flow channel 420 and the inlet end 310 of the pump mechanism 300 into the pump chamber of the pump mechanism 300, then through the outlet end 320 of the pump mechanism 300 and the second flow channel 410 into the first flow channel 211, and then through the cavity 2200 of the cleaning accessory 2000 and out of the outlet 2300.

[0061] refer to Figure 3 The power components (motor 200 and pump mechanism 300) and the liquid storage chamber 120 can be arranged sequentially along the first axis (e.g., Figure 1 The power unit is located above the liquid storage chamber 120 to shorten the longitudinal length of the liquid storage chamber 120, making it easier for the user to clean the water tank; it also reduces the lateral width of the housing 100 for easier gripping. The pump mechanism 300 can be positioned closer to the liquid storage chamber 120 than the motor 200 to allow the pump mechanism 300 to draw liquid from the liquid storage chamber 120.

[0062] To increase the longitudinal height of the liquid storage chamber 120 and thus increase its volume, refer to Figure 3 and Figure 4Optionally, both the inlet end 310 and the outlet end 320 of the pump mechanism 300 can be located on one side of the pump mechanism 300 along the second axis direction, wherein the second axis direction intersects the first axis direction. This shortens the length occupied by the pump mechanism 300 in the first axis direction, increases the length of the liquid storage chamber 120 in the first axis direction, and thus increases the volume of the liquid storage chamber 120. Furthermore, the second axis direction is perpendicular to the first axis direction. Figure 3 and Figure 4 In the middle, the first axis direction is up and down, the second axis direction is left and right, and the inlet end 310 and outlet end 320 of the pump mechanism 300 are both located on the left side of the pump mechanism 300.

[0063] To effectively utilize the lateral space of the pump mechanism 300, the connector 400 can be further connected to one side of the pump mechanism 300 along the second axis direction (e.g., Figure 3 and Figure 4 (left side of the middle), so that the third flow channel 420 and at least a portion of the second flow channel 410 are located on one side of the pump mechanism 300 along the second axis direction (e.g. Figure 3 and Figure 4 (Left side of the middle). The connection between the connector 400 and the liquid storage chamber 120 can be located on one side of the pump mechanism 300 along the second axis direction (e.g., the left side of the middle). Figure 4 (on the left side of the middle) so as to shorten the distance between the inlet end 310 of the pump mechanism 300 and the liquid storage chamber 120, so that the pump mechanism 300 can draw liquid from the liquid storage chamber 120.

[0064] Furthermore, in the first axial direction, the inlet end 310 and outlet end 320 of the pump mechanism 300 can be closer to the liquid storage chamber 120. That is, the inlet end 310 and outlet end 320 of the pump mechanism 300 are located at the end of the pump mechanism 300 closer to the liquid storage chamber along the first axial direction. This shortens the distance between the inlet end 310 of the pump mechanism 300 and the bottom of the liquid storage chamber 120, facilitating the pump mechanism 300 to draw liquid from the liquid storage chamber 120; and increases the distance between the outlet end 320 of the pump mechanism 300 and the first flow channel 211, thereby reducing the impact force of the liquid at the outlet end 320 of the pump mechanism 300 on the output shaft 210 of the motor 200, thus improving connection stability.

[0065] The oral cleaning device 1000 provided in this application embodiment may further include an energy source 710, which can be a device such as a rechargeable battery or a storage battery that can provide electrical energy to the motor 200, the pump mechanism 300, and the electrical components on the circuit board 720. To maintain the elongated shape of the oral cleaning device 1000, the energy source 710 may be located on the side of the pump mechanism 300 away from the motor 200 along the first axis (e.g., ...). Figure 3 and Figure 4The energy source 710 is located on the lower side of the housing 100, and at least a portion of the energy source 710 is arranged side by side with at least a portion of the liquid storage cavity 120. In other words, the energy source 710 and the liquid storage cavity 120 share the bottom 170 of the housing 100.

[0066] Figure 5 This is an internal layout diagram of an oral cleaning device 1000 provided in an embodiment of this application. (Reference) Figures 3-5 For example, the liquid storage cavity 120 may be wrapped around one side of the energy source 710 in the first axial direction. For example, Figure 5 In this configuration, the liquid storage cavity 120 can enclose the outer surface and bottom surface of the energy source 710. That is, in the first axial direction, the energy source 710 has a top surface and a bottom surface opposite to each other, and the housing 100 can have an inner top surface and an inner bottom surface opposite to each other; there is a gap between the bottom surface of the energy source 710 and the inner bottom surface of the housing 100, and at least part of the liquid storage cavity is located between the bottom surface of the energy source 710 and the inner bottom surface of the housing 100. In other words, the liquid storage cavity 120 can be concave, and the energy source 710 can be located in the concave recess of the liquid storage cavity 120. Alternatively, the liquid storage cavity 120 can only enclose the outer surface of the energy source 710, meaning that the bottom surface of the energy source 710 abuts against the inner bottom surface of the housing 100.

[0067] Figure 6 Another internal layout diagram of the oral cleaning device 1000 provided in an embodiment of this application. (Refer to...) Figure 6 In another exemplary embodiment, a space for placing the energy source 710 is formed between the liquid storage cavity 120 and the inner shell wall of the housing 100. For example, Figure 6 In this configuration, the liquid storage cavity 120 can cover the bottom surface of the energy source 710 and at least a portion of the outer surface of the energy source 710. That is, there is a gap between the bottom surface of the energy source 710 and the inner bottom surface of the housing 100, and at least a portion of the liquid storage cavity is located between the bottom surface of the energy source 710 and the inner bottom surface of the housing 100. In other words, the liquid storage cavity 120 can be L-shaped, and the energy source 710 can be located at the notch of the L-shaped liquid storage cavity 120. Alternatively, the liquid storage cavity 120 can only cover the outer surface of the energy source 710, meaning that the bottom surface of the energy source 710 abuts against the inner bottom surface of the housing 100.

[0068] The liquid storage chamber 120 may be formed from a housing 130 separate from the housing 100. The liquid storage chamber 120 may be detachably connected to the housing 100 so that the user can remove the liquid storage chamber 120 from the housing 100 for cleaning. Alternatively, the liquid storage chamber 120 may be formed from the inner wall of the housing 100 and the partition 600. See, for details... Figure 5 and Figure 6The oral cleaning device 1000 provided in this application embodiment may further include a separator 600, which may be disposed in the inner cavity of the housing 100 and may divide the inner cavity of the housing 100 into a power chamber 110 and a liquid storage chamber 120. The motor 200, the pump mechanism 300, and the energy source 710 may all be disposed in the power chamber 110. Figure 5 and Figure 6 In the middle, the separator 600 and the side located along the first axis direction of the separator 600 (e.g. Figure 5 and Figure 6 The inner shell wall of the housing 100 (on the left side) can be closed to form a power cavity 110, and the partition 600 and the other side located along the first axis direction (such as the left side) Figure 5 and Figure 6 The inner shell wall of the casing 100 (on the right side) can be closed to form a liquid storage cavity 120.

[0069] For example, refer to Figure 4 and Figure 7 The separator 600 is detachably connected to the housing 100 so that the user can remove the separator 600 from the housing 100 for cleaning. For sealing purposes, a first seal 810 can be filled between the separator 600 and the housing 100. For example, the outer wall of the separator 600 can be provided with a first sealing groove, which forms a first sealing cavity with the inner wall of the housing 100. The first seal 810 can be a first sealing ring, which seals in the first sealing cavity to prevent liquid leakage. Additionally, the separator 600 and the housing 100 can be detachably connected by a snap-fit ​​connection; and / or, the separator 600 and the connector 400 (or the mounting member 500 mentioned below) can be fastened together by fasteners such as bolts. Furthermore, the fastener connection can be waterproofed. For example, see reference... Figure 12 The separator 600 may have a blind hole, the connector 400 or the mounting part 500 may have a threaded hole, and the first fastener 921 may pass through the blind hole of the separator 600 and be threadedly connected to the threaded hole of the connector 400 or the mounting part 500.

[0070] In another example, the separator 600 and the housing 100 may be a single piece formed by a one-piece molding process to facilitate assembly and improve connection strength.

[0071] Figure 7 for Figure 4 A cross-sectional view of the separator 600 is shown. (Reference) Figure 4 and Figure 7To enable communication between the inlet end 310 of the pump mechanism 300 located in the power chamber 110 and the storage chamber 120, the separator 600 may have a communication hole 680 connecting the power chamber 110 and the storage chamber 120. The third flow channel 420 of the connector 400 can communicate with the storage chamber 120 through this communication hole 680. To shorten the distance between the inlet end 310 of the pump mechanism 300 and the storage chamber 120, optionally, the communication hole 680 may be located on one side of the pump mechanism 300 along the second axis direction (e.g., Figure 4 (Left side of the middle).

[0072] To prevent liquid leakage, the connector 400 and the connecting hole 680 can optionally be sealed together by a second sealing element 820. Specifically, the outer wall of the connector 400 may have a second sealing groove, which forms a second sealing cavity with the inner wall of the connecting hole 680. The second sealing element 820 may be a second sealing ring, which can seal in the second sealing cavity.

[0073] The separator 600 may have a receiving opening 620 and a receiving cavity 610 for receiving the energy source 710. The receiving opening 620 may be located on the side of the receiving cavity 610 facing the pump mechanism 300 along the first axis direction (e.g., Figure 4 and Figure 7 (The upper side of the middle). Among them, the separator 600 can be as follows: Figures 3-5 , Figure 7 The shown can be used to separately form the receiving opening 620 and the receiving cavity 610. Alternatively, the partition 600 can be as follows: Figure 6 The inner shell wall of the housing 100 forms a receiving opening 620 and a receiving cavity 610.

[0074] In one possible configuration of the separator 600, refer to Figures 3-5 , Figure 7 When the liquid storage cavity 120 surrounds one side of the energy source 710 along the first axis, the separator 600 may include a first portion 630 and a second portion 640 connected sequentially along the first axis, with the first portion 630 being closer to the pump mechanism 300 than the second portion 640. The inner wall of the first portion 630 may form a receiving opening 620 and a part of the receiving cavity 610, and the inner wall of the second portion 640 may form another part of the receiving cavity 610. The shape of the outer wall of the first portion 630 may be adapted to the shape of the inner shell wall of the housing 100, and the outer wall of the first portion 630 abuts against the inner shell wall of the housing 100. The first portion 630 may have a connecting hole 680. At least a portion of the liquid storage cavity 120 may be defined between the outer wall of the second portion 640 and the inner shell wall of the housing 100.

[0075] For example, the liquid storage cavity 120 may be provided with a fourth flow channel 651 connecting the bottom of the liquid storage cavity 120 and the connecting hole 680. This fourth flow channel 651 can be formed by a separate tube. Alternatively, the fourth flow channel 651 can be formed by a separator 600 to facilitate assembly and improve the connection strength between the fourth flow channel 651 and the connecting hole 680. Specifically, refer to... Figure 4 The separator 600 may further include a third portion 650, which is integrally connected to the first portion 630. The third portion 650 may have a fourth flow channel 651 for liquid flow, which connects the connecting hole 680 to the side of the liquid storage chamber 120 away from the pump mechanism 300. Furthermore, the fourth flow channel 651 may extend along the first axis to reduce the length of the water path between the inlet end 310 of the pump mechanism 300 and the side of the liquid storage chamber 120 away from the pump mechanism 300.

[0076] In another possible configuration of the separator 600, refer to Figure 6 When a space for placing the energy source 710 is formed between the liquid storage cavity 120 and the inner shell wall of the housing 100, the separator 600 may include a fourth portion 660, which may extend along the first axis. At least a portion of the liquid storage cavity 120 may be formed between the fourth portion 660 and a portion of the inner shell wall of the housing 100, and at least a portion of the receiving cavity 610 may be formed between the fourth portion 660 and another portion of the inner shell wall of the housing 100.

[0077] Furthermore, the separator 600 may also include a fifth portion 670, which may be connected between the fourth portion 660 and the inner wall of the housing 100, and the fifth portion 670 may provide support for the energy source 710 in the first axial direction.

[0078] refer to Figure 1 Oral irrigators often have vents in their water tanks. These vents allow airflow into the tank during pump operation, filling any gaps caused by liquid loss and ensuring the tank's interior is open to the outside. Exposed vents detract from the aesthetics of the oral irrigator; furthermore, they pose a risk of being blocked when holding the device, potentially interfering with pump operation. Additionally, incorporating the vents internally would require additional ventilation tubing within the internal space, increasing design complexity.

[0079] To address the aforementioned technical problems, the inventors of this application conceived of disassembling the main body into two nestable parts, utilizing the assembly gap between these two parts to connect the inner cavity of the water tank to the outside, thus achieving a hole-free appearance for the device. However, it is difficult to precisely control the assembly gap; some products on the same production line have larger assembly gaps, posing a risk of leakage, while others have smaller gaps, making it difficult for external gas to pass through. Based on this, the inventors of this application conceived of forming a microchannel between the mating surfaces of the two parts. The cross-section of this microchannel can be set to be small, allowing gas flow while blocking liquid outflow. The assembly gap can be made slightly larger to facilitate the passage of external gas and to ensure that the assembly gaps of products on the same production line are not significantly different.

[0080] For details, please refer to Figure 3 The housing 100 may include a housing 130 and a cover 140. The housing 130 may include a top wall and side walls, the side walls of which may be connected to the outer periphery of the top wall and extend along a first axial direction. The top wall of the housing 130 may have a through-hole 530 through which the output shaft 210 of the motor 200 passes. The housing 130 may have an opening, which can be used as... Figure 3 The opening is provided at one end of the housing 130 along the first axis and can be disposed opposite to the top wall of the housing 130; or, the opening can be provided on the side wall of the housing 130.

[0081] The cover 140 can seal the opening of the housing 130, so that the housing 130 and the cover 140 can be closed to form the inner cavity of the outer shell. The cover 140 and the housing 130 can be nested into each other along a preset direction. The preset direction can be the direction of the first axis or the direction intersecting the first axis.

[0082] Specifically, the cover 140 may include a bottom wall and side walls. The side walls of the cover 140 may be connected to the outer periphery of the bottom wall and extend in a certain direction. The side walls and bottom wall of the cover 140 may form an inner cavity of the cover 140 that is open at one end. The side walls of the cover 140 may be as follows: Figure 3 The cover 140 is embedded in the inner cavity of the housing 130; or, the sidewall of the cover 140 may be fitted onto the outer side of the housing 130. In addition, the cover 140 and the housing 130 may form at least a partial liquid storage cavity 120.

[0083] refer to Figure 8 and Figure 9 The cover 140 may have a first mating surface 145, and the housing 130 may have a second mating surface 131 opposite to the first mating surface 145. An assembly gap 190 may be formed between the first mating surface 145 and the second mating surface 131. For example, Figure 3In this design, the cover 140 can be embedded within the inner cavity of the housing 130. The outer surface of the cover 140 embedded in the housing 130 can be a first mating surface 145, and the outer surface of the housing 130 fitted over the cover 140 can be a second mating surface 131. Alternatively, the cover 140 can be fitted over the outer surface of the housing 130, with the inner surface of the cover 140 serving as the first mating surface 145 and the outer surface of the housing 130 as the second mating surface 131. This allows the gas flow channel to be concealed within the device, preventing blockage and providing advantages such as easy ventilation and a non-porous appearance.

[0084] Additionally, a microchannel 180 may be formed between the housing 130 and the cover 140. The microchannel 180 allows gas to pass through along the first axial direction and blocks liquid outflow. The microchannel 180 connects the liquid storage chamber 120 to the outside via the assembly gap 190 between the housing 130 and the cover 140. Optionally, in a predetermined direction, the liquid storage chamber 120 may be higher than the microchannel 180, so that the water level in the liquid storage chamber 120 can be higher than that in the microchannel 180.

[0085] Specifically, the liquid level in the reservoir 120 can be higher than that in the microchannel 180, creating a pressure difference between the external air pressure (one atmosphere) and the air pressure within the reservoir 120 (less than one atmosphere). This pressure difference allows gas flow while preventing liquid outflow, achieving both ventilation and leak prevention. It's worth noting that the phrase "preventing liquid outflow" can be interpreted broadly, meaning that when the oral cleaning device 1000 is stationary or in a normal user grip position, the microchannel 180 prevents liquid outflow. However, vigorous shaking by the user may disrupt surface tension, affecting air pressure and causing liquid to leak from the microchannel 180.

[0086] The following is for reference. Figure 8 and Figure 9 The formation of the microchannel 180 is described below. Specifically, one of the housing 130 and the cover 140 may have a third sealing groove 141 on its sidewall, and the third sealing groove 141 may have an opening facing outward. The sidewall of the other housing 130 and the cover 140 may be combined with the third sealing groove 141 to form a third sealing cavity 142, which is connected to the liquid storage cavity 120 and the outside through the assembly gap 190. The bottom of the third sealing groove 141 may have an airflow groove 143, and the airflow groove 143 may have an opening facing the third sealing cavity 142.

[0087] For example, Figure 8 Zhongyu Figure 9In one embodiment, the cover 140 is embedded within the inner cavity of the housing 130. The side wall of the cover 140 may be provided with a third sealing groove 141, which may have an outward opening. The side wall of the housing 130 and the third sealing groove 141 can be combined to form a third sealing cavity 142. Alternatively, the cover 140 may be fitted over the outside of the housing 130. The side wall of the housing 130 may be provided with a third sealing groove 141, which may have an outward opening. The side wall of the cover 140 and the third sealing groove 141 can be combined to form a third sealing cavity 142.

[0088] Figure 10 A cross-sectional view of the housing 100 provided in an embodiment of this application at a location other than the airflow channel 143. (See reference...) Figure 10 The housing 100 may further include a third seal 830, which can be clamped between the inner wall of the other of the housing 130 and the cover 140 and the bottom of the third sealing groove 141. The cross-sectional shape of the third seal 830 may be circular, polygonal, etc., and the embodiments of this application do not specifically limit the cross-sectional shape of the third seal 830.

[0089] Continue to refer to Figure 8 and Figure 9 The third seal 830 forms a microchannel 180 between its surface near the airflow groove 143 and the airflow groove 143. Thus, the third seal 830 seals the cavity outside the airflow groove 143. A microchannel 180 is formed in the airflow groove 143, allowing gas to flow through while blocking liquid flow. The machining depth of the airflow groove 143 is generally precise, allowing for accurate control of the size of the formed microchannel 180. Therefore, the housing 100 provided in this embodiment not only achieves airflow and liquid blocking but also boasts a high yield rate. Furthermore, when the pump mechanism 300 draws in liquid, the third seal 830 flattens and deforms, increasing the assembly gap and further facilitating air intake.

[0090] The liquid level difference h formed by the highest liquid level in the storage cavity 120 and the horizontal plane where the airflow channel 143 is located satisfies the following condition: 0 < ρ * g * h ≤ 30% * Po; where ρ represents air density; g represents liquid density; and Po represents one atmosphere of pressure.

[0091] Specifically, the greater the pressure difference between the liquid in the storage cavity 120 and the external atmospheric pressure, the more readily gas can flow from the outside into the storage cavity 120, thus preventing leakage. Conversely, the smaller the pressure difference between the liquid in the storage cavity 120 and the external atmospheric pressure, the less readily gas can flow from the outside into the storage cavity 120, potentially leading to leakage. The inventors of this application have verified that when the liquid level difference h meets the above conditions, the microchannel 180 allows gas to pass through while preventing liquid leakage.

[0092] To further prevent liquid leakage, the liquid level difference h can satisfy 0 < ρ*g*h ≤ 20%*Po; to further prevent liquid leakage, the liquid level difference h can satisfy 0 < ρ*g*h ≤ 10%*Po. For example, ρ*g*h ≤ 10%*Po, ρ*g*h ≤ 5%*Po, ρ*g*h ≤ 1%*Po.

[0093] Furthermore, the depth of the airflow channel 143 can be between 0.1 mm and 0.4 mm to facilitate the passage of gas while blocking the passage of liquid. For example, the depth of the airflow channel 143 can be 0.1 mm, 0.3 mm, 0.4 mm, etc. Furthermore, the depth of the airflow channel 143 can be between 0.25 mm and 0.34 mm to further facilitate gas passage and liquid blocking. For example, the depth of the airflow channel 143 can be 0.25 mm, 0.30 mm, 0.34 mm, etc.

[0094] In the preset direction, the third sealing groove 141 can be as follows: Figure 8 and Figure 9 The bottom wall of the third sealing groove 141 may be connected between the two groove sidewalls, which are arranged opposite to each other; or, the third sealing groove 141 may have a first groove sidewall, which may be used to support one side of the third seal 830.

[0095] When the third seal 830 has two groove sidewalls, in order to allow gas to flow in and out of the third sealing cavity 142, exemplarily, refer to Figure 8 In a predetermined direction, the height of the third seal 830 can be less than the height of the groove bottom wall. Thus, a channel communicating with the microchannel 180 can be formed between the third seal 830 and one of the groove sidewalls, and also between the third seal 830 and the other groove sidewall. In this way, gas entering the third sealing cavity 142 can... Figure 8 The arrow shown indicates that the airflow exits the third sealing cavity 142 after circling the third seal 830 at least half a turn. Furthermore, the airflow groove 143 can be as follows: Figure 11 As shown, it penetrates the bottom wall of the groove along a predetermined direction.

[0096] Another example, see reference Figure 9 Both inner sidewalls can be provided with guide grooves 144, which can have openings facing the third sealing cavity 142, and a channel for gas flow can be formed between the guide grooves 144 and the third sealing element, the channel communicating with the microchannel 180. Gas entering the third sealing cavity 142 passes through the channel and the microchannel 180... Figure 9 The arrow shown indicates that the flow exits the third sealing cavity 142 after circling the third seal 830 at least half a circumference. Furthermore, the guide channel 144 may penetrate the sidewall of the channel in a direction perpendicular to the bottom wall of the channel.

[0097] Similarly, when the third seal 830 has a groove sidewall, the gas inflow and outflow in the third sealing cavity 142 can be achieved by reducing the height of the third seal 830 or by setting a guide groove 144 on the groove sidewall.

[0098] Optional, see reference Figure 11 The circumferential length of the airflow groove 143 is shorter than the circumferential length of the sealing groove. There may be one or more airflow grooves 143. When there are multiple airflow grooves 143, the multiple airflow grooves 143 may be arranged at intervals.

[0099] Optionally, the cover 140 can be detachably connected to the housing 130 so that when the liquid storage chamber 120 needs to be drained, the cover 140 can be removed from the housing 130 to achieve the purpose of rapid drainage.

[0100] Figure 12 An exploded view of the oral cleaner provided in an embodiment of this application. (Reference) Figure 12 The oral cleaner provided in this embodiment may further include a mounting member 500. For ease of assembly, the mounting member 500 is fixed to the inner wall of the housing 100, and both the motor 200 and the pump mechanism 300 can be mounted on the mounting member 500. Thus, during assembly, the motor 200 and the pump mechanism 300 can be first assembled onto the mounting member 500, and then the two can be assembled as a single unit and installed into the housing 100.

[0101] It should be noted that both the motor 200 and the pump mechanism 300 vibrate during operation, resulting in poor connection reliability of the pipeline connecting the outlet end 320 of the pump mechanism 300 and the first flow channel 211 of the output shaft 210, making it prone to detachment. To address this problem, the inventors of this application devised a solution to disassemble the pump mechanism 300 into a power end 330, an inlet end 310, and an outlet end 320, integrating the outlet end 320 onto the connector 400 and the mounting component 500. This reduces resonance and improves the connection reliability at the junction of the second flow channel 410 of the connector 400 and the outlet end 320 of the pump mechanism 300.

[0102] For details, please refer to Figures 13-16The second valve portion 321 of the outlet end 320 can be integrated into the mounting member 500, and the second end cap portion 322 of the outlet end 320 can be integrated into the connector 400. The power end 330, at least a portion of the connector 400, and at least a portion of the mounting member 500 can be sequentially arranged along the outlet direction (second axial direction) of the outlet end 320, and can be connected by a third fastener 923. In this way, the mounting member 500 is positioned between the connector 400 and the power end 330 of the pump mechanism 300, thereby allowing most of the vibration of the pump body to be transmitted to the mounting member 500. A vibration damping component can be provided between the mounting component 500 and the inner wall of the housing 100. The mounting component 500 can eliminate vibration through a vibration damping connection, thereby reducing or eliminating the vibration transmitted from the power end 330 of the pump mechanism 300 to the connecting component 400. This reduces the impact of the vibration of the power end 330 of the pump mechanism 300 on the connecting component 400 and improves the connection reliability at the junction of the second flow channel 410 of the connecting component 400 and the outlet end 320 of the pump mechanism 300. In addition, integrating the outlet end 320 into the mounting component 500 and the connecting component 400 not only facilitates assembly but also results in a shorter water path and stronger connection reliability.

[0103] Optionally, the power end 330 may include a pump housing 331 and a piston 332, with one end of the pump housing 331 having an opening. The mounting member 500 may cover the opening, and the mounting member 500 and the pump housing 331 may be closed to form a pump chamber of the pump mechanism 300 for the piston 332 to reciprocate along the discharge direction of the discharge end 320. The mounting member 500 may have a discharge port penetrating the mounting member 500 and communicating with the pump chamber of the pump mechanism 300. A second valve portion 321 of the discharge end 320 is disposed in the discharge port, and the second valve portion 321 of the discharge end 320 may allow liquid to be pumped out of the pump chamber through the discharge port and prevent liquid from flowing into the pump chamber through the discharge port.

[0104] Specifically, the piston 332 reciprocates within the pump chamber, allowing the liquid in the pump chamber to be pumped out through the outlet hole; the valve at the outlet end 320 is unidirectional to prevent liquid from flowing back into the pump chamber through the outlet hole. In this design, the mounting component 500 is used to form the pump chamber and the outlet hole, achieving the purpose of integrating the valve portion of the outlet end 320.

[0105] Optional, see reference Figure 16 The power end 330 may also include a drive member 333, which may have a drive shaft that rotates relative to the pump housing 331. The drive shaft can drive an eccentric wheel to rotate relative to the pump housing 331, and the eccentric wheel can abut against the piston 332 to perform reciprocating motion.

[0106] refer to Figures 15-17Optionally, at least part of the connector 400 and the second end cap portion 322 of the liquid outlet 320 can be a single piece formed by an integral molding process. The second end cap portion 322 of the liquid outlet 320 can cover the liquid outlet hole, and the second end cap portion 322 of the liquid outlet 320 can form a liquid outlet flow channel that connects the liquid outlet hole and the second flow channel 410.

[0107] Specifically, the liquid outlet channel of the second end cap portion 322 of the liquid outlet end 320 can guide the flow direction of the liquid flowing out of the liquid outlet hole. In this solution, the connector 400 and the second end cap portion 322 of the liquid outlet end 320 are integrated, so that the liquid outlet channel and the second flow channel 410 are integrated, which helps to improve the connection reliability at the connection point, improve the smoothness of liquid flow, and improve the convenience of assembly.

[0108] Optionally, the mounting 500 may have an inlet port that penetrates the mounting 500 and communicates with the pump chamber of the pump mechanism 300. A first valve portion 311 of the inlet end 310 may be provided in the inlet port, and the first valve portion 311 of the inlet end 310 may allow liquid to be pumped into the pump chamber through the inlet port and prevent liquid from flowing out through the inlet port.

[0109] Specifically, the piston 332 reciprocates within the pump chamber, allowing liquid to be pumped into the pump chamber from the inlet port; the valve at the inlet end 310 is unidirectional to prevent liquid from flowing out through the inlet port. In this design, the mounting component 500 is used to form the pump chamber and the inlet port, achieving the purpose of integrating the first valve portion 311 of the inlet end 310.

[0110] Optionally, at least a portion of the connector 400 and the first end cap portion 312 of the liquid inlet end 310 can be integrally formed using a one-piece molding process. The first end cap portion 312 of the liquid inlet end 310 can cover the liquid inlet hole, and can form a liquid inlet channel communicating with the liquid inlet hole. This liquid inlet channel can communicate with the third flow channel 420 of the connector 400. Thus, the liquid inlet channel of the first end cap portion 312 of the liquid inlet end 310 can guide the flow direction of the liquid flowing into the liquid inlet hole. In this solution, the connector 400 and the first end cap portion 312 of the liquid inlet end 310 are integrally formed, making the liquid inlet channel and the third flow channel 420 integral, which helps improve the connection reliability at the connection point, improves the smoothness of liquid flow, and improves the ease of assembly.

[0111] refer to Figures 13-16Optionally, the mounting member 500 may include a first mounting portion 510, which may have a first side and a second side disposed opposite to each other along the liquid discharge direction of the liquid discharge end 320. The power end 330 of the motor 200 and the pump mechanism 300 may be spaced apart along the axial direction of the output shaft 210 on the first side of the first mounting portion 510. A portion of the connector 400, which integrates the second end cap portion 322 of the liquid discharge end 320, may be disposed on the second side of the first mounting portion 510. The mounting member 500 may have a through hole 530 through which the connector 400 passes and restricts the connector 400 along at least one side along the axial direction of the output shaft 210. In this way, the through hole 530 can be used to restrict the connector 400 in order to provide upward support and limit the connector 400 to prevent the connector 400 from vibrating up and down. Optionally, the circuit board 720 may be mounted on the side of the first mounting portion 510 opposite to the motor 200 by a third fastener 924. A fourth damping element 914 may be provided between the circuit board 720 and the inner wall of the housing 100.

[0112] refer to Figure 12 and Figure 13 Optionally, the mounting component 500 may further include a second mounting portion 520, which can be mated to the first side of the first mounting portion 510, and the second mounting portion 520 and the first mounting portion 510 can be combined to form a receiving space for enclosing the outer surface of the motor 200. In this way, the mounting component 500 encloses the outer surface of the motor 200, so that most of the vibration of the motor 200 is transmitted to the mounting component 500, thereby reducing or eliminating the vibration transmitted from the motor 200 to the connector 400. This reduces the impact of vibration from the power end 330 of the motor 200 on the connector 400 and improves the connection reliability at the junction of the second flow channel 410 of the connector 400 and the first flow channel 211 of the motor 200. Optionally, refer to... Figure 13 The first mounting part 510 and the second mounting part 520 can be fastened together by the second fastener 922.

[0113] Optionally, a vibration damping element is sandwiched between the first mounting portion 510 and the outer surface of the motor 200; and / or, a vibration damping element is sandwiched between the second mounting portion 520 and the outer surface of the motor 200. In this way, the vibration transmission between the motor 200 and the mounting portion 500 can be reduced by the vibration damping element. For example, Figure 13 In the middle, the second damping component 912 is clamped between the front end of the motor 200 and the mounting component 500, and the third damping component 913 is clamped between the rear end of the motor 200 and the mounting component 500.

[0114] refer to Figure 17Optionally, the connector 400 may have a mounting groove 450 through which the output shaft 210 of the motor 200 passes, and a fourth seal 840 may be filled between the inner wall of the mounting groove 450 and the output shaft 210 of the motor 200. Specifically, the first flow channel 211 of the output shaft 210 and the second flow channel 410 of the connector 400 may communicate at the mounting groove 450, and the seal can prevent liquid leakage at the communication point.

[0115] Continue to refer to Figure 17 Optionally, the motor 200 may include a motor body 220 and an output shaft 210. The output shaft 210 of the motor 200 may pass through the motor body 220, and both axial ends of the output shaft 210 may extend out of the motor body 220. The bottom surface of the motor body 220 and the inner wall of the mounting groove 450 may form a limiting space for restricting the fourth seal 840. This limiting space can restrict the fourth seal 840 at both ends in the axial direction of the output shaft 210. In this way, the bottom surface of the motor body 220 of the motor 200 and the bottom wall of the mounting groove 450 can be used to restrict the fourth seal 840 to prevent the fourth seal 840 from moving with vibration.

[0116] refer to Figure 17 The second flow channel 410 may include a first flow section 411 and a second flow section 412 connected in sequence. The first flow section 411 is connected to the liquid outlet 320 and can extend along the first axis direction, and there is a gap between the first flow section 411 and the first flow channel 211 in the second axis direction. The second flow section 412 can connect the first flow section 411 and the first flow channel 211, and the second flow section 412 may include a first arc segment 4121, which can be circularly transitioned to the first flow section 411. The circular transition reduces the resistance of the inner wall of the flow channel to the liquid, which is beneficial to the flow of the liquid.

[0117] Furthermore, the first arc segment 4121 may be higher than the pump mechanism 300, and the first arc segment 4121 may have an arc center facing the pump mechanism 300, so that the liquid flows more smoothly toward the first flow channel 211, thereby further reducing the resistance of the inner wall of the flow channel to the liquid.

[0118] Optionally, the second flow section 412 further includes a second arc section 4122, which has a circular arc transition with the first flow channel 211. This circular arc transition reduces the resistance of the inner wall of the flow channel to the liquid, thus facilitating the flow of the liquid.

[0119] Furthermore, the second arc segment 4122 has an arc center facing the motor 200, so that the second arc segment 4122 smoothly contacts the first flow channel 211, which is conducive to the flow of liquid.

[0120] refer to Figure 17 and Figure 18Optionally, the connector 400 may include a first connecting portion 430 and a second connecting portion 440 connected to each other. The first connecting portion 430 may have a first flow section 411 and a reversing cavity 431 communicating with the first flow section 411. The reversing cavity 431 may have a first inner arc surface 432 and may have an opening in the first axial direction. At least a portion of the second connecting portion 440 may be built into the reversing cavity 431 through the opening and may have a second inner arc surface 441. The first inner arc surface 432 and the second inner arc surface 441 may together form a second flow section 412.

[0121] Specifically, the second connecting portion 440 may include a cover plate section 442, a protruding section 443, and a baffle section 444. The protruding section 443 and the baffle section 444 may be connected to both sides of the cover plate section 442 along the first axis direction, respectively. The cover plate section 442 may cover the reversing cavity 431, and the baffle section 444 may be located in the reversing cavity 431 and may have a second inner arc surface 441. The cover plate section 442 may have a through hole, and the protruding section 443 may surround the outside of the through hole, and the inner cavity of the protruding section 443 may communicate with the through hole. The output shaft 210 may pass through the inner cavity of the protruding section 443 and the through hole, and a fourth sealing element 840 is provided between the output shaft 210 and the inner wall of the protruding section 443. In this way, the protruding section 443 and part of the cover plate section 442 may form the mounting groove 450 mentioned above.

[0122] The terms "upper" and "lower" are used to describe the relative positions of the various structures in the accompanying drawings. They are only for clarity of description and are not intended to limit the scope of implementation of this application. Any changes or adjustments to the relative positions without substantially altering the technical content shall also be considered within the scope of implementation of this application.

[0123] It should be noted that, in this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0124] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0125] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A housing for oral cleaning, characterized in that, The device includes a housing (130) and a cover (140), wherein the housing (130) has an opening and the cover (140) covers the opening of the housing (130); the cover (140) and the housing (130) are nested together in a predetermined direction, and the cover (140) and the housing (130) define a liquid storage cavity (120); A microchannel (180) is formed between the housing (130) and the cover (140); and the microchannel (180) allows gas to pass through in the preset direction and blocks liquid from flowing out, and the microchannel (180) connects the liquid storage cavity (120) to the outside through the assembly gap (190) between the housing (130) and the cover (140).

2. The housing for oral cleaning according to claim 1, characterized in that, A sealing groove (141) is provided on the side wall of one of the housing (130) and the cover (140), and the sealing groove (141) has an opening facing outward; the side wall of the other of the housing (130) and the cover (140) together with the sealing groove (141) forms a sealing cavity (142), and the sealing cavity (142) is connected to the liquid storage cavity (120) and the outside through the assembly gap (190); the bottom wall of the sealing groove (141) is provided with an airflow groove (143), and the airflow groove (143) has an opening facing the sealing cavity (142); The housing (100) further includes a seal (830) which is clamped between the inner wall of the other of the housing (130) and the cover (140) and the bottom wall of the sealing groove (141), and the surface of the seal (830) near the airflow groove (143) forms the microchannel (180) with the airflow groove (143).

3. The housing for oral cleaning according to claim 2, characterized in that, The liquid level difference h formed by the highest liquid level in the liquid storage cavity (120) and the horizontal plane where the airflow channel (143) is located satisfies the following condition: 0 < ρ * g * h ≤ 30% * Po; where ρ represents air density; g represents liquid density; and Po represents one atmosphere of pressure.

4. The housing for oral cleaning according to claim 3, characterized in that, The height difference h satisfies the following condition: 0 < ρ * g * h ≤ 20% * Po.

5. The housing for oral cleaning according to claim 3, characterized in that, The height difference h satisfies the following condition: 0 < ρ * g * h ≤ 10% * Po.

6. The housing for oral cleaning according to claim 5, characterized in that, The depth of the airflow groove (143) is between 0.1 mm and 0.4 mm.

7. The housing for oral cleaning according to claim 6, characterized in that, The depth of the airflow groove (143) is between 0.25 mm and 0.35 mm.

8. The housing for oral cleaning according to claim 5, characterized in that, The sealing groove (141) has a bottom wall and two side walls, the two side walls being connected to both sides of the bottom wall along the preset direction; In the preset direction, the height of the seal (830) is less than the height of the bottom wall of the groove.

9. The housing for oral cleaning according to claim 8, characterized in that, The airflow groove (143) penetrates the bottom wall of the groove along the preset direction.

10. The housing for oral cleaning according to claim 5, characterized in that, The sealing groove (141) has a bottom wall and two side walls, the two side walls being connected to both sides of the bottom wall along the preset direction; Both inner sidewalls are provided with guide grooves (144), the guide grooves (144) have openings facing the sealing cavity (142), and a channel for gas to flow is formed between the guide grooves (144) and the sealing element (830), the channel being connected to the microchannel (180); The gas entering the sealed cavity (142) flows out of the sealed cavity (142) after passing through the channel and the microchannel (180) around the seal (830) for at least half a circumference.

11. The housing for oral cleaning according to claim 10, characterized in that, The guide channel (144) penetrates the sidewall of the channel in a direction perpendicular to the bottom wall of the channel.

12. The housing for oral cleaning according to any one of claims 5-11, characterized in that, The circumferential length of the airflow groove (143) is shorter than the circumferential length of the sealing groove (141).

13. An oral hygiene device, characterized in that, The device includes a pump mechanism (300), a cleaning attachment (2000), and a housing (100) for oral cleaning as described in any one of claims 1-13. The pump mechanism (300) is disposed in the inner cavity of the housing (100). The cleaning attachment (2000) has a communicating cavity (2200) and an outlet (2300). The cavity (2200) of the cleaning attachment (2000) is connected to the liquid outlet (320) of the pump mechanism (300). The pump mechanism (300) pumps liquid from the liquid storage chamber (120) into the cavity (2200) of the cleaning attachment (2000) and out through the outlet (2300).

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