A plunger-type oral irrigator structure

Abstract

This invention provides a plunger-type oral irrigator structure. The inner core assembly includes an inner core shell, functional components, and a sealing assembly. The functional components include a water pump, a transmission mechanism, and a motor. The sealing assembly includes a first sealing structure disposed between the pump body and the inner core shell, a second sealing structure disposed between the output shaft and the inner core shell, and a third sealing structure located at least partially between the first and second sealing structures. In this invention, the first, second, and third sealing structures create a sealed space within the inner core shell. When liquid leaks between the plunger and the inner wall of the pump body, this liquid flows into this sealed space, thereby preventing external leakage. By setting the first, second, and third sealing structures, and ensuring a tight seal between them, this invention effectively isolates liquid within the sealed space, preventing external leakage and protecting components such as the motor and battery from corrosion.

Description

Technical Field

[0001] This utility model relates to the field of oral irrigator technology, specifically to a plunger oral irrigator structure. Background Technology

[0002] A water flosser is an auxiliary oral cleaning tool. It mainly uses a built-in water pump system to draw water from the tank and convert it into a high-pressure pulsed water flow. After being sprayed out from the nozzle, it washes the teeth, gaps between teeth, and gums, thereby effectively removing food residue and harmful bacteria, achieving the purpose of oral health care.

[0003] A water flosser typically consists of a housing, a mechanism housed within the housing, and a water tank. The mechanism mainly comprises a water pump, a motor, and a transmission system. The motor drives a piston to reciprocate within the water pump body via the transmission system, thereby drawing in water and pressurizing it for ejection. However, in actual use, if the sealing structure between the water pump and the housing is poorly designed, or if the seals are aged or worn, the high-pressure water or water vapor generated during spraying may seep into the mechanism area from gaps such as the connection between the pump body and the housing. This can cause corrosion of electronic components such as the battery, motor, and circuit board, affecting the lifespan and safety of the device.

[0004] In existing technologies, such as Chinese utility model patent CN220869585U, a water pump structure for a water flosser with piston wear prevention function is disclosed. A leak-proof soft rubber cup is installed between the pump and the inner casing to collect water that may leak from the top of the pump body. However, due to potential wobbling or wear of the piston during reciprocating motion, a gap may form between the piston and the inner wall of the pump body, allowing water to still leak from this sealing structure. Once water seeps into the inner casing, it can cause short circuits, oxidation, or corrosion of electronic components such as the motor and battery, severely affecting the lifespan and safety of the water flosser.

[0005] Therefore, there is an urgent need for a water purifier structure with a good sealing structure that can prevent water seeping between the piston and the pump body from corroding electronic components such as motors and batteries. Utility Model Content

[0006] Therefore, the technical problem to be solved by this utility model is to overcome the technical defects in the prior art where the piston movement causes water to seep out between it and the inner wall of the pump body, which can easily cause short circuits, oxidation or corrosion of electronic components such as motors and batteries, thus seriously affecting the service life and safety of the water flosser. The present invention provides a plunger water flosser structure that can prevent water seeping out between the piston and the pump body from corroding electronic components such as motors and batteries.

[0007] Therefore, this utility model provides a plunger-type oral irrigator structure, including an inner core assembly, the inner core assembly comprising: The inner core housing includes a first housing and a second housing that are spliced ​​together, and the first housing and the second housing are arranged opposite each other along the axial tangent of the inner core housing; A functional component, housed within the inner core housing, includes a water pump, a transmission mechanism, and a motor arranged sequentially along the axial direction of the inner core housing; the water pump includes a pump body and a plunger; the motor has an output shaft; the transmission mechanism connects the output shaft and the plunger respectively, and is used to drive the plunger to reciprocate within the pump body; The sealing assembly includes a first sealing structure disposed between the pump body and the inner wall of the inner core housing, a second sealing structure disposed between the output shaft and the inner wall of the inner core housing, and a third sealing structure disposed at the mating surface of the first housing and the second housing, and at least partially located between the first sealing structure and the second sealing structure; the third sealing structure forms a sealing fit with the first sealing structure and the second sealing structure respectively, thereby jointly forming a sealed space.

[0008] Furthermore, the third sealing structure includes: The first sealing strip is pressed and installed between the mating surfaces on one side of the first housing and the second housing, and extends to both ends along the axial direction of the inner core housing and connects with the first sealing structure and the second sealing structure respectively; The second sealing strip is pressed and installed between the mating surfaces on the other side of the first housing and the second housing, extending along both ends of the inner core housing axially and connecting with the first sealing structure and the second sealing structure.

[0009] Furthermore, the first housing has a first groove for installing the first sealing strip and a second groove for installing the second sealing strip.

[0010] Furthermore, the first sealing structure is a first sealing ring, which is sleeved on the pump body and seals against the inner walls of the pump body and the inner core housing, respectively.

[0011] Furthermore, a first semi-annular groove is formed on the inner side of the first housing, and a second semi-annular groove is formed on the inner side of the second housing opposite to the first semi-annular groove. The first semi-annular groove and the second semi-annular groove form an annular groove for accommodating the first sealing ring. The annular groove is connected to the first groove and the second groove respectively, and the first sealing strip located in the first groove and the second sealing strip located in the second groove are in sealing contact with the first sealing ring located in the annular groove respectively.

[0012] Furthermore, a sealing skirt is provided on the outer periphery of the first sealing ring, the sealing skirt being tapered with its small end located on the side away from the second sealing structure.

[0013] Furthermore, the second sealing structure includes: A partition is disposed on the inner wall of the second housing and extends toward the inner wall of the first housing. The partition has stepped holes on the side facing the motor. The second sealing ring is installed inside the stepped hole and is in sealing fit with the stepped surface of the stepped hole and / or the circumferential inner wall of the stepped hole; the second sealing ring is sleeved on the output shaft and is in sealing fit with the output shaft; The third sealing strip is pressed and installed between the top of the partition and the inner wall of the first housing.

[0014] Furthermore, the first housing has a third groove for installing the third sealing strip, and the third groove communicates with the first groove and the second groove respectively; The third sealing strip, the first sealing strip, and the second sealing strip are integrally formed. Preferably, the side of the first sealing strip opposite to the first groove, the side of the second sealing strip opposite to the second groove, and the side of the third sealing strip opposite to the third groove are integrally formed with a lip strip.

[0015] Furthermore, the transmission mechanism includes: Gear, connected to the output shaft; A crown gear meshes with the gear, and the rotation axis of the crown gear is perpendicular to the rotation axis of the gear; an eccentric wheel is provided at the top of the crown gear; The connecting rod is connected to the plunger at one end and has a collar at the other end, which is sleeved on the eccentric wheel.

[0016] Furthermore, it also includes: The outer casing, wherein the inner core assembly is disposed inside the outer casing; A water tank is connected to the outer shell and connected to the water pump inlet via a water pumping pipe; the water pump inlet is equipped with a one-way valve that allows unidirectional flow in the liquid inlet direction. The nozzle is mounted on the housing and connected to the water pump outlet via a water supply pipeline; the water pump outlet is equipped with a one-way drain valve that allows unidirectional flow in the discharge direction.

[0017] The technical solution provided by this utility model has the following advantages: The present invention discloses a plunger-type oral irrigator structure, comprising an inner core assembly, which includes an inner core shell, a functional component, and a sealing component. The inner core shell comprises a first shell and a second shell joined together, the first shell and the second shell being arranged opposite each other along their axial cross-sections. The functional component, housed within the inner core shell, includes a water pump, a transmission mechanism, and a motor arranged sequentially along the axial direction of the inner core shell. The water pump includes a pump body and a plunger. The motor has an output shaft. The transmission mechanism connects the output shaft and the plunger, respectively, to drive the plunger to reciprocate within the pump body. The sealing component includes a first sealing structure disposed between the pump body and the inner wall of the inner core shell, a second sealing structure disposed between the output shaft and the inner wall of the inner core shell, and a third sealing structure disposed at the mating surface of the first shell and the second shell, and at least partially located between the first sealing structure and the second sealing structure. The third sealing structure forms a sealing fit with both the first sealing structure and the second sealing structure, thereby collectively forming a sealed space.

[0018] The plunger-type oral irrigator structure of this utility model has a first sealing structure, a second sealing structure, and a third sealing structure that create a sealed space inside the inner core housing. When liquid seeps out between the plunger and the inner wall of the pump body, the liquid will flow into the sealed space. These sealing structures can effectively prevent the liquid that has entered the sealed space from continuing to leak outward, thereby protecting components such as the motor, battery, and circuit board from water corrosion and contamination.

[0019] This utility model's plunger-type oral irrigator structure, through the arrangement of a first sealing structure, a second sealing structure, and a third sealing structure, with these three sealing structures forming a sealed fit, effectively isolates the liquid within a sealed space, preventing it from leaking outwards. The design of the inner core component allows it to be produced and tested as an independent module before being integrated into the final product, which is beneficial for improving production efficiency and quality control. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the prior art or specific embodiments of this utility model, the accompanying drawings used in the description of the prior art or specific embodiments are briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the overall structure of the inner core component of this utility model.

[0022] Figure 2 This is a schematic diagram after the first shell has been opened.

[0023] Figure 3 This is a three-dimensional view of the second shell.

[0024] Figure 4This is a schematic diagram after a portion of the top of the first shell has been cut off.

[0025] Figure 5 This is a schematic diagram of the first sealing ring.

[0026] Figure 6 It is a three-dimensional view of the one-piece molded first sealing strip, second sealing strip, third sealing strip and lip strip.

[0027] Figure 7 This is a schematic diagram of the structure of the plunger-type dental irrigator of this utility model.

[0028] Reference numerals: 11, First housing; 110, First semi-annular groove; 111, First recess; 112, Second recess; 113, Third recess; 12, Second housing; 120, Second semi-annular groove; 121, Partition; 1210, Stepped hole; 1211, Stepped surface; 21, Water pump; 211, Pump body; 212, Piston; 22, Motor; 221, Output shaft; 23, Gear; 24, Crown gear; 25, Eccentric wheel; 26, Connecting rod; 27, Collar; 29, Battery; 30, Sealed space; 31, First sealing ring; 311, Sealing skirt; 32, Second sealing ring; 331, First sealing strip; 332, Second sealing strip; 333, Third sealing strip; 334, Lip strip; 4, Outer shell; 5, Water tank; 6, Nozzle. Detailed Implementation

[0029] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0030] It should be noted that the terms "first," "second," etc., in the claims and specification of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such as a process, method, system, product, or device that includes a series of steps or units, not limited to those steps or units explicitly listed, but may also include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0031] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0032] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] This embodiment provides a plunger-type punch structure, such as Figure 1-5 As shown, the system includes an inner core assembly, which comprises an inner core housing, functional components, and a sealing assembly. The inner core housing includes a first housing 11 and a second housing 12 joined together, with the first housing 11 and the second housing 12 arranged opposite each other along the axial sectional plane of the inner core housing. The functional components are housed within the inner core housing and include a water pump 21, a transmission mechanism, and a motor 22 arranged sequentially along the axial direction of the inner core housing. The water pump 21 includes a pump body 211 and a plunger 212. The motor 22 has an output shaft 221. The transmission mechanism connects the output shaft 221 and the plunger 21. 2. Used to drive the plunger 212 to reciprocate within the pump body 211; the sealing assembly includes a first sealing structure disposed between the pump body 211 and the inner wall of the inner core housing, a second sealing structure disposed between the output shaft 221 and the inner wall of the inner core housing, and a third sealing structure disposed at the mating surface of the first housing 11 and the second housing 12, and at least partially located between the first sealing structure and the second sealing structure; the third sealing structure forms a sealing fit with the first sealing structure and the second sealing structure respectively, thereby jointly forming a sealed space 30.

[0034] The plunger-type oral irrigator structure of this embodiment comprises an inner core housing composed of a first housing 11 and a second housing 12, arranged opposite each other along their axial cross-section. The first housing 11 and the second housing 12 can be made of high-strength engineering plastic or metal injection molding or precision machining. The inner core housing is generally cylindrical in shape, and the first housing 11 and the second housing 12 can be connected using snap-fits, screws, etc. After assembly, the first housing 11 and the second housing 12 have internal space to accommodate the water pump 21, transmission mechanism, and motor 22, as well as internal walls that cooperate with the sealing components. The pump body 211 has a working chamber designed for the reciprocating motion of the plunger 212. The inlet of the pump body 211 is used to connect to the water pumping pipe, and the outlet is used to connect to the water delivery pipe. The pump body 211 is fixed inside the inner core housing. The plunger 212 can achieve reciprocating linear motion within the pump body 211, completing the functions of water suction and pressurization. The first sealing structure is located between the pump body 211 and the inner core housing, the second sealing structure is located between the output shaft 221 and the inner core housing, and the third sealing structure is located at least partially between the first sealing structure and the second sealing structure. The extension path of the third sealing structure on the mating surface of the first housing 11 and the second housing 12 at least covers the area between the first sealing structure and the second sealing structure, and forms a sealing connection with the first sealing structure and the second sealing structure respectively, so that the first sealing structure, the second sealing structure and the third sealing structure together constitute a continuous sealing space 30.

[0035] In this embodiment, the first sealing structure, the second sealing structure, and the third sealing structure construct a sealed space 30 inside the inner core housing. When liquid seeps out between the plunger 212 and the inner wall of the pump body 211, the liquid will flow into the sealed space 30. These sealing structures can effectively prevent the liquid entering the sealed space 30 from continuing to leak outward, thereby protecting components such as the motor 22, battery 29, and circuit board from water corrosion and contamination.

[0036] The plunger-type oral irrigator structure of this embodiment includes a first sealing structure, a second sealing structure, and a third sealing structure. These three sealing structures form a sealed fit, effectively isolating the liquid within the sealed space 30 and preventing leakage. The design of the inner core component allows it to be manufactured and tested as an independent module before being integrated into the final product, which improves production efficiency and quality control.

[0037] The plunger-type irrigator structure of this embodiment is as follows: Figure 2 , Figure 5As shown, the third sealing structure further includes a first sealing strip 331 and a second sealing strip 332; the first sealing strip 331 is pressed and installed between the mating surfaces on one side of the first housing 11 and the second housing 12, and extends to both ends along the axial direction of the inner core housing and connects with the first sealing structure and the second sealing structure respectively; the second sealing strip 332 is pressed and installed between the mating surfaces on the other side of the first housing 11 and the second housing 12, and extends to both ends along the axial direction of the inner core housing and connects with the first sealing structure and the second sealing structure respectively.

[0038] In this embodiment, the third sealing structure includes a first sealing strip 331 and a second sealing strip 332, which are respectively installed between the mating surfaces on both sides of the first housing 11 and the second housing 12. The two sealing strips extend axially and connect with the first and second sealing structures respectively, forming a sealing path. When the first housing 11 and the second housing 12 are joined, the first sealing strip 331 and the second sealing strip 332 form a tight fit with the mating surfaces of the two housings. By providing sealing strips on the mating surfaces of the first housing 11 and the second housing 12, leakage caused by gaps in the housing mating is effectively prevented.

[0039] The plunger-type irrigator structure of this embodiment, further, is as follows: Figure 2 As shown, the first housing 11 has a first groove 111 for installing the first sealing strip 331 and a second groove 112 for installing the second sealing strip 332.

[0040] In this embodiment, first grooves 111, with depths and widths suitable for installing the first sealing strip 331, are machined on the mating surfaces on both sides of the first housing 11. During actual assembly, the first sealing strip 331 is embedded in the first groove 111, and the second sealing strip 332 is embedded in the second groove 112. When the second housing 12 is spliced ​​with the first housing 11, the first sealing strip 331 and the second sealing strip 332 are compressed by the two housings, thereby achieving a better sealing effect. The first groove 111 and the second groove 112 provide precise installation positions, preventing the sealing strips from shifting, rolling, or deforming during assembly or use, thus improving the stability and lifespan of the seal. The two sealing strips are subjected to a preset compression within the grooves, enabling them to fit more effectively with the mating surfaces of the housings, forming a more reliable seal. The preset grooves make the installation of the sealing strips more convenient and quick, reducing assembly difficulty and cost.

[0041] In this embodiment of the plunger irrigator structure, the first sealing structure is a first sealing ring 31, which is sleeved on the pump body 211 and seals with the inner walls of the pump body 211 and the inner core shell, respectively.

[0042] In this embodiment, the inner ring of the first sealing ring 31 matches the outer wall of the pump body 211. Its inner diameter is designed to be slightly smaller than the outer diameter of the pump body 211, or it has elastic deformation capability, so that it can be fitted onto the outer circumference of the pump body 211 and form a reliable seal on its inner wall. At the same time, the outer circumference of the first sealing ring 31 can also achieve a sealing fit with the inner wall of the inner core shell (the inner sidewalls of the first shell 11 and the second shell 12), preventing leakage channels between the pump body 211 and the inner core shell.

[0043] In this embodiment of the plunger irrigator structure, a first semi-annular groove 110 is formed on the inner side of the first housing 11, and a second semi-annular groove 120 is formed on the inner side of the second housing 12, which is opposite to the first semi-annular groove 110. The first semi-annular groove 110 and the second semi-annular groove 120 form an annular groove for accommodating the first sealing ring 31. The annular groove communicates with the first groove 111 and the second groove 112 respectively. The first sealing strip 331 located in the first groove 111 and the second sealing strip 332 located in the second groove 112 respectively make sealing contact with the first sealing ring 31 located in the annular groove.

[0044] In this embodiment, a first semi-annular groove 110 is machined on the inner wall of the first housing 11 along the outer periphery of the pump body 211, and a second semi-annular groove 120 is machined on the inner wall of the second housing 12 at the position corresponding to the first semi-annular groove 110. When the first housing 11 and the second housing 12 are joined together, the two semi-annular grooves combine to form a complete annular groove for accommodating the first sealing ring 31. This annular groove communicates with the first groove 111 and the second groove 112 on the first housing 11. During assembly, the first sealing ring 31 is placed in the annular groove, the first sealing strip 331 is installed in the first groove 111, and the second sealing strip 332 is installed in the second groove 112. The first sealing strip 331 and the second sealing strip 332 will form a sealing contact with the first sealing ring 31 inside the annular groove. By accommodating the first sealing ring 31 in the annular groove formed by the two housings and achieving a linkage seal with the sealing strip of the third sealing structure, a more effective and systematic sealing structure is formed. The interconnected design of the annular groove and the recess ensures that the sealing path from the housing mating surface to the first sealing ring is continuous, reducing potential leakage points.

[0045] The plunger-type irrigator structure of this embodiment, further, is as follows: Figure 4 As shown, the outer periphery of the first sealing ring 31 is provided with a sealing skirt 311, which is tapered and the small end is located on the side away from the second sealing structure.

[0046] In this embodiment, a sealing skirt 311 extending outward is provided on the outer circumference of the first sealing ring 31, and its shape is designed to be conical. The smaller end refers to the end with a smaller diameter. The sealing skirt 311 can enhance the sealing performance of the first sealing ring 31 and improve the adaptability and compensation capability of the first sealing ring 31.

[0047] The plunger-type irrigator structure of this embodiment, further, is as follows: Figure 2 , Figure 3 As shown, the second sealing structure includes a partition 121, a second sealing ring 32, and a third sealing strip 333. The partition 121 is disposed on the inner sidewall of the second housing 12 and extends toward the inner sidewall of the first housing 11. The partition 121 has a stepped hole 1210 on the side facing the motor 22. The second sealing ring 32 is installed in the stepped hole 1210 and is sealed and fitted with the stepped surface 1211 of the stepped hole 1210 and / or the circumferential inner wall of the stepped hole 1210. The second sealing ring 32 is sleeved on the output shaft 221 and is sealed and fitted with the output shaft 221. The third sealing strip 333 is pressed and installed between the top of the partition 121 and the inner wall of the first housing 11.

[0048] In this embodiment, the partition 121 extends on the inner wall of the second housing 12 towards the first housing 11 (i.e., away from the inner wall of the second housing 12). A stepped hole 1210 is provided on the body of the partition 121, facing the motor side, penetrating the partition 121. The second sealing ring 32 is sleeved on the output shaft 221 of the motor 22 and installed within the stepped hole 1210 of the partition 121. The axial end face of the second sealing ring 32 can tightly fit with the stepped surface 1211 of the stepped hole 1210 to achieve a seal; simultaneously, the circumferential outer surface of the second sealing ring 32 can also tightly fit with the inner wall of the large hole of the stepped hole 1210 to achieve a seal. Simultaneously, the second sealing ring 32 also achieves a sealing fit with the outer wall of the output shaft 221 itself, preventing leakage between the output shaft 221 and the second sealing ring. A third sealing strip 333 is installed between the top of the partition 121 (the end facing the first housing 11) and the inner wall of the first housing 11. The function of the third sealing strip 333 is to seal the mating surfaces of the partition 121 and the first housing 11. The cooperation between the partition 121 and the second sealing ring 32, combined with the sealing of the mating surfaces of the partition 121 and the first housing 11 by the third sealing strip 333, ensures the sealing reliability of the output shaft 221 and prevents damage to the motor or leakage hazard.

[0049] In this embodiment of the plunger irrigator structure, the first housing 11 has a third groove 113 for installing the third sealing strip 333, and the third groove 113 communicates with the first groove 111 and the second groove 112 respectively; the third sealing strip 333, the first sealing strip 331, and the second sealing strip 332 are integrally formed; preferably, the side of the first sealing strip 331 away from the first groove 111, the side of the second sealing strip 332 away from the second groove 112, and the side of the third sealing strip 333 away from the third groove 113 are integrally formed with a lip strip 334.

[0050] In this embodiment, a third groove 113 is disposed on the inner wall of the first housing 11 for mounting a third sealing strip 333. This third groove 113 communicates with the first groove 111 and the second groove 112 on the first housing 11. The third sealing strip 333 is integrally formed with the first sealing strip 331 and the second sealing strip 332 to form an integral structure, which can be injection molded in a secondary manner. Simultaneously, a lip strip 334 is integrally formed on the outer side of this integral structure (i.e., the side facing the second housing 12). This integrally formed sealing structure greatly simplifies the assembly process, reduces the number of parts, and lowers assembly costs and error rates. The connectivity of the various grooves and the integral forming of the sealing strip enable the entire sealing structure to work more effectively, forming a seamless sealing barrier. When compressed, the lip strip 334 can fit more tightly against the sealed surface, significantly improving the tightness and reliability of the seal, maintaining excellent sealing performance even under pressure changes or slight displacement.

[0051] The plunger-type irrigator structure of this embodiment, further, is as follows: Figure 2 As shown, the transmission mechanism includes a gear 23, a crown gear 24, and a connecting rod 26; the gear 23 is connected to the output shaft 221; the crown gear 24 meshes with the gear 23, and the rotation axis of the crown gear 24 is perpendicular to the rotation axis of the gear 23; the crown gear 24 is provided with an eccentric wheel 25 at its top; one end of the connecting rod 26 is connected to the plunger 212, and the other end is provided with a collar 27, which is sleeved on the eccentric wheel 25.

[0052] In this embodiment, gear 23 is directly fixed to the end of the output shaft 221 of motor 22. Crown gear 24 is used to transmit power between two mutually perpendicular shafts. It meshes with gear 23, and an eccentric wheel 25 is mounted on crown gear 24. One end of connecting rod 26 is firmly connected to plunger 212, enabling it to reciprocate with the movement of connecting rod 26; the other end of connecting rod 26 is provided with a collar 27, which is sleeved on the outer edge of eccentric wheel 25. During operation, motor 22 drives output shaft 221 and gear 23 to rotate. Gear 23 drives crown gear 24 to rotate. Because eccentric wheel 25 is offset from the central axis of crown gear 24, when crown gear 24 rotates, eccentric wheel 25 will rotate around a non-central point. The collar 27 sleeved on eccentric wheel 25 will be forced to follow the movement trajectory of eccentric wheel 25. This eccentric motion of rotation is converted into the reciprocating linear motion of connecting rod 26, which ultimately drives plunger 212 to perform a similar reciprocating motion within pump body 211.

[0053] The plunger-type irrigator structure of this embodiment, further, is as follows: Figure 6 As shown, it also includes a housing 4, a water tank 5, and a nozzle 6; the inner core assembly is disposed inside the housing 4; the water tank 5 is connected to the housing 4 and is connected to the water inlet of the water pump 21 through a water pumping pipe; the water inlet of the water pump 21 is provided with a one-way valve that allows unidirectional flow in the liquid inlet direction; the nozzle 6 is mounted on the housing 4 and is connected to the water outlet of the water pump 21 through a water delivery pipe; the water outlet of the water pump 21 is provided with a one-way valve that allows unidirectional flow in the liquid outlet direction.

[0054] In this embodiment, the outer casing 4 houses the entire inner core assembly. The water tank 5 is detachably connected to the outer casing 4. The water tank 5 is connected to the inlet of the water pump 21 via a water pumping pipe to provide the working medium for the water pump. The nozzle 6 is installed on the outside of the outer casing 4 and is connected to the outlet of the water pump 21 via a water supply pipe. The inlet of the water pump 21 is equipped with a one-way valve that allows unidirectional flow in the inlet direction, and the outlet is equipped with a one-way valve that allows unidirectional flow in the outlet direction.

[0055] In this embodiment, when the device is started, the motor 22 drives the water pump 21 to work. When the connecting rod 26, under the action of the motor, drives the plunger 212 to move, creating a negative pressure inside the pump body 211, the inlet check valve opens and the outlet check valve closes, and the water pump 21 draws water from the water tank 5; when the connecting rod 26 drives the plunger 212 to move, pressurizing the water inside the pump body 211 to a certain pressure, the inlet check valve closes and the outlet check valve opens, and high-pressure water is sprayed out from the water pump 21 through the nozzle 6.

[0056] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this innovative technical solution.

Claims

1. A plunger-type oral irrigator structure, characterized in that, Includes an inner core assembly, the inner core assembly comprising: The inner core housing includes a first housing (11) and a second housing (12) spliced ​​together, wherein the first housing (11) and the second housing (12) are arranged opposite each other along the axial tangent of the inner core housing; A functional component, housed within the inner core housing, includes a water pump (21), a transmission mechanism, and a motor (22) arranged sequentially along the axial direction of the inner core housing; the water pump (21) includes a pump body (211) and a plunger (212); the motor (22) has an output shaft (221); the transmission mechanism connects the output shaft (221) and the plunger (212) respectively, and drives the plunger (212) to reciprocate within the pump body (211); The sealing assembly includes a first sealing structure disposed between the pump body (211) and the inner wall of the inner core housing, a second sealing structure disposed between the output shaft (221) and the inner wall of the inner core housing, and a third sealing structure disposed at the mating surface of the first housing (11) and the second housing (12) and at least partially located between the first sealing structure and the second sealing structure; the third sealing structure forms a sealing fit with the first sealing structure and the second sealing structure respectively, thereby jointly forming a sealed space (30).

2. The plunger-type irrigator structure according to claim 1, characterized in that, The third sealing structure includes: The first sealing strip (331) is pressed and installed between the mating surfaces on one side of the first housing (11) and the second housing (12), and extends along both ends of the inner core housing axially and connects with the first sealing structure and the second sealing structure respectively; The second sealing strip (332) is pressed and installed between the mating surfaces on the other side of the first housing (11) and the second housing (12), and extends along both ends of the inner core housing axially and connects with the first sealing structure and the second sealing structure.

3. The plunger-type irrigator structure according to claim 2, characterized in that, The first housing (11) has a first groove (111) for installing the first sealing strip (331) and a second groove (112) for installing the second sealing strip (332).

4. The plunger-type oral irrigator structure according to claim 3, characterized in that, The first sealing structure is a first sealing ring (31), which is sleeved on the pump body (211) and seals with the inner wall of the pump body (211) and the inner core shell respectively.

5. The plunger-type oral irrigator structure according to claim 4, characterized in that, The first housing (11) has a first semi-annular groove (110) on its inner side, and the second housing (12) has a second semi-annular groove (120) on its inner side that is opposite to the first semi-annular groove (110). The first semi-annular groove (110) and the second semi-annular groove (120) form an annular groove for accommodating the first sealing ring (31). The annular groove is connected to the first groove (111) and the second groove (112) respectively. The first sealing strip (331) located in the first groove (111) and the second sealing strip (332) located in the second groove (112) are in sealing contact with the first sealing ring (31) located in the annular groove respectively.

6. The plunger-type irrigator structure according to claim 5, characterized in that, The outer periphery of the first sealing ring (31) is provided with a sealing skirt (311), which is tapered and the small end is located on the side away from the second sealing structure.

7. The plunger-type oral irrigator structure according to claim 6, characterized in that, The second sealing structure includes: A partition (121) is provided on the inner wall of the second housing (12) and extends toward the inner wall of the first housing (11). The partition (121) has a stepped hole (1210) on the side facing the motor (22). The second sealing ring (32) is installed in the stepped hole (1210) and is sealed and fitted with the stepped surface (1211) of the stepped hole (1210) and / or the circumferential inner wall of the stepped hole (1210); the second sealing ring (32) is sleeved on the output shaft (221) and is sealed and fitted with the output shaft (221); The third sealing strip (333) is pressed and installed between the top of the partition (121) and the inner wall of the first housing (11).

8. The plunger-type oral irrigator structure according to claim 7, characterized in that, The first housing (11) has a third groove (113) for installing the third sealing strip (333), and the third groove (113) is connected to the first groove (111) and the second groove (112) respectively; The third sealing strip (333), the first sealing strip (331), and the second sealing strip (332) are integrally formed structures; The first sealing strip (331) has a lip strip (334) integrally formed on the side opposite to the first groove (111), the second sealing strip (332) has a side opposite to the second groove (112), and the third sealing strip (333) has a side opposite to the third groove (113).

9. The plunger-type irrigator structure according to claim 1, characterized in that, The transmission mechanism includes: Gear (23) is connected to the output shaft (221); A crown gear (24) meshes with the gear (23), and the rotation axis of the crown gear (24) is perpendicular to the rotation axis of the gear (23); an eccentric wheel (25) is provided on the top of the crown gear (24). The connecting rod (26) is connected to the plunger (212) at one end and has a collar (27) at the other end, which is sleeved on the eccentric wheel (25).

10. The plunger-type irrigator structure according to claim 1, characterized in that, Also includes: The outer casing (4) has the inner core assembly disposed inside the outer casing (4); A water tank (5) is connected to the outer shell (4) and connected to the inlet of the water pump (21) through a water pumping pipe; the inlet of the water pump (21) is provided with a one-way valve that allows unidirectional flow in the direction of liquid inlet. The nozzle (6) is installed on the housing (4) and connected to the outlet of the water pump (21) through the water supply pipeline; the drain outlet of the water pump (21) is provided with a drain check valve that unidirectionally guides the flow in the direction of discharge.

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