A one-way valve for use on a dental treatment apparatus

Abstract

The application relates to a one-way valve applied to a dental treatment device, which comprises a valve body, an inflow hole and an outflow hole communicated with a valve cavity channel in the valve body, a valve core and a power elastic piece driving the valve core to move to the inflow hole direction in the valve cavity channel; the outer circumferential surface of the valve core is slidably matched with the inner wall of the valve cavity channel, a plurality of flow-through grooves are arranged on the outer circumferential surface of the valve core, a blocking part is arranged on the head end of the valve core, an avoiding flow-through groove is arranged on the tail end surface of the valve core, the tail end of the flow-through groove is communicated with the avoiding flow-through groove, and the avoiding flow-through groove corresponds to the input end of the outflow hole. The guiding structure and the flow-through structure are integrated on the outer circumferential surface of the valve core, the moving quality of the valve core can be guaranteed, the efficiency and stability of fluid flow-through after the valve core is opened can be improved, the working reliability and use stability of the one-way valve as a whole can be improved, and the stable use of the one-way valve in the dental treatment device can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of dental treatment equipment technology, and specifically to a one-way valve applied to dental treatment equipment. Background Technology

[0002] A one-way valve is a control component of dental equipment (such as water flossers and dental treatment units). It enables fluid to flow in one direction to prevent backflow and ensures the stability of the dental equipment.

[0003] For example, the one-way valve structure disclosed in the technical solution with application number CN201721791014.5 includes an inlet valve body with an inlet hole and an outlet valve body detachably connected to the inlet valve body. The outlet valve body is provided with a linear guide channel. A switching assembly is slidably accommodated between the outlet valve body and the inlet valve body. The switching assembly includes a valve core and a dynamic elastic element sleeved on the valve core. One end of the valve core is matched with the inlet hole. The cylindrical guide portion of the valve core extends into the linear guide channel. When the one-way valve structure is turned on or off, the cylindrical guide portion advances or resets along the linear guide channel. At the same time, the outlet valve body is provided with several outlet grooves evenly around the linear guide channel. The outlet grooves are used to discharge the liquid through the several outlet grooves when the one-way valve structure is turned on, thereby realizing the outflow control of the liquid.

[0004] However, since the outlet groove is distributed around the outer periphery of the linear guide channel, in order to ensure the flow area of ​​the outlet groove, it is usually necessary to limit the inner diameter of the linear guide channel. This results in a corresponding reduction in the diameter of the cylindrical guide part of the valve core, leading to insufficient strength of the cylindrical guide part of the valve core. Under long-term pressure, elasticity and friction, it is prone to bending deformation or wear, which affects the guiding quality of the cylindrical guide part. Moreover, the axis of the cylindrical guide part will shift after deformation, which will also cause the valve core to tilt and increase the friction with the inner wall of the channel (from surface contact to point contact). This will cause the valve core and the inlet hole to fail to seal and leak, affecting the stability of the one-way valve. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, this utility model provides a one-way valve for use in dental treatment equipment.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A one-way valve for use in dental treatment equipment includes a valve body, a valve cavity channel within the valve body, an inlet hole and an outlet hole communicating with the valve cavity channel on the outside of the valve body, a valve core and a dynamic elastic element for driving the valve core to move towards the inlet hole within the valve cavity channel; characterized in that: the outer peripheral surface of the valve core slides and guides the inner wall of the valve cavity channel, and the outer peripheral surface of the valve core has a plurality of flow grooves distributed circumferentially along the outer peripheral surface of the valve core, the flow grooves extending along the moving direction of the valve core;

[0008] The valve core has a blocking part at its head end to restrict fluid from flowing from the inlet hole to the valve cavity passage;

[0009] The valve core has an avoidance flow groove on its tail end face. The tail end of the flow groove is connected to the avoidance flow groove, and the avoidance flow groove corresponds to the outflow hole input end.

[0010] In this invention, a sealing ring is provided between the inlet hole and the valve cavity channel to cooperate with the blocking part. The inlet hole and the valve cavity channel are connected through the inner cavity of the sealing ring to form a fluid channel. When the blocking part is tightly fitted with the sealing ring under the action of the dynamic elastic element, the fluid cannot flow from the inlet hole to the outlet hole through the valve cavity channel.

[0011] In this utility model, the valve core includes a large-diameter section and a small-diameter section connected sequentially along the axial direction. The outer peripheral surface of the large-diameter section slides and guides the inner wall of the valve cavity channel. The blocking part is provided on the first end of the large-diameter section. The clearance flow groove is provided on the tail end face of the small-diameter section. The flow groove includes a first groove provided on the outer peripheral surface of the large-diameter section and a second groove provided on the outer peripheral surface of the small-diameter section. The first groove and the second groove are interconnected, and the second groove is interconnected with the clearance flow groove.

[0012] In this invention, the diameter of the large-diameter section is larger than the diameter of the small-diameter section, and an annular gap is formed between the outer circumferential surface of the small-diameter section and the inner wall of the valve cavity channel.

[0013] In this invention, the valve cavity channel and the outlet hole are connected by a transition cavity, and the dynamic elastic element is a compression spring. One end of the compression spring presses against the valve core, and the other end presses against the wall of the transition cavity.

[0014] In this invention, the compression spring is fitted on the outer periphery of the small-diameter section of the valve core, with one end of the compression spring pressing against the end face of the large-diameter section and the other end pressing against the inner wall of the transition cavity.

[0015] In this utility model, the valve body includes an inflow valve body and an outflow valve body installed on the inflow valve body. The inflow hole is provided on the inflow valve body, and the valve cavity channel and the outflow hole are both provided on the outflow valve body. The sealing ring is provided at the connection between the inflow valve body and the outflow valve body.

[0016] In this utility model, the inflow valve body is provided with an installation slot, the inflow hole is connected through the installation slot, the outflow valve body is provided with a connecting part, the connecting part is fitted and installed in the installation slot, and the sealing ring is provided in the installation slot, the sealing ring is located between the side of the connecting part away from the outflow valve body and the end face of the installation slot.

[0017] In this utility model, the first end of the valve cavity channel passes through the connecting part on the side away from the valve body and corresponds to the inner cavity of the sealing ring. The inner wall of the mounting slot is provided with an internal thread, and the outer circumferential surface of the connecting part is provided with an external thread that mates with the internal thread.

[0018] In this invention, the blocking part includes a sealing boss, the diameter of which gradually increases from the first end to the last end of the blocking part, and the maximum diameter of the sealing boss is greater than the minimum diameter of the inner cavity of the sealing ring.

[0019] The beneficial effects of this utility model are as follows: Firstly, the sliding fit between the outer circumferential surface of the valve core and the inner wall of the valve cavity channel achieves guidance during the movement of the valve core. This structure is simple and stable, effectively ensuring the quality of valve core movement. Secondly, by setting circumferentially distributed flow grooves on the outer circumference of the valve core and an avoidance flow groove located at the tail end of the valve core, the fluid can flow smoothly to the outlet hole through the flow grooves and avoidance flow grooves when the valve core is opened, effectively avoiding flow obstruction caused by the tail end blocking the outlet hole after the valve core has moved into place. The above structure integrates the guiding structure and the flow structure on the outer circumferential surface of the valve core, effectively avoiding the drawbacks of traditional technical solutions, reducing manufacturing costs, and possessing advantages such as simplicity and stability. While ensuring the quality of valve core movement, it can also improve the efficiency and stability of fluid flow after the valve core is opened, improving the overall working reliability and operational stability of the check valve, thereby ensuring the stable use of the check valve in dental treatment equipment. In addition, the check valve uses the same sealing ring to simultaneously achieve end face sealing between the inflow valve body and the outflow valve body, as well as dynamic sealing between the valve core and the valve cavity channel. This effectively simplifies the structure of the check valve, reduces the number of sealing elements, and lowers assembly difficulty and production costs. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a 3D view of a check valve;

[0022] Figure 2 Cross-section of a check valve Figure 1 ;

[0023] Figure 3 Cross-section of a check valve Figure 2 ;

[0024] Figure 4Explosion of a one-way valve Figure 1 ;

[0025] Figure 5 Explosion of a one-way valve Figure 2 . Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0027] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, unless otherwise explicitly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection using welding, a detachable connection using bolts, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0030] Reference Figure 1-5 A one-way valve for use in dental treatment equipment includes a valve body, a valve cavity channel 100 provided inside the valve body, an inlet hole 200 and an outlet hole 300 communicating with the valve cavity channel 100 outside the valve body, and a valve core 1 and a dynamic elastic element 2 for driving the valve core 1 to move in the direction of the inlet hole 200 are provided inside the valve cavity channel 100.

[0031] Furthermore, the outer peripheral surface of the valve core 1 slides and guides the inner wall of the valve cavity channel 100, thereby achieving the purpose of guiding the valve core 1 to be installed on the valve body. The outer peripheral surface of the valve core 1 is provided with a plurality of flow grooves 11 distributed circumferentially along the outer peripheral surface of the valve core 1. The flow grooves 11 extend along the moving direction of the valve core 1. The first end of the valve core 1 is provided with a blocking part 12 for restricting the flow of fluid from the inlet hole 200 to the valve cavity channel 100. When the valve core 1 moves towards the outlet hole 300 due to the fluid pressure overcoming the elastic force of the dynamic elastic element 2, the blocking part 12 at the first end of the valve core 1 disengages from the sealing ring 3, and the inlet hole 200 communicates with the valve cavity channel 100. The fluid can flow through the flow grooves 11 on the outer periphery of the valve core 1 to the avoidance flow groove 13 at the tail end, and finally enter the outlet hole 300 through the transition cavity 400.

[0032] Furthermore, the tail end face of the valve core 1 is provided with an avoidance flow groove 13. The tail end of the flow groove 11 extends toward and connects to the avoidance flow groove 13. The avoidance flow groove 13 corresponds to the outlet hole 300. The avoidance flow groove 13 is used to provide an auxiliary channel for fluid to pass through when the valve core 1 moves to the opening limit position, so as to avoid the tail end of the valve core 1 blocking the input end of the outlet hole 300 and ensure that the fluid flows smoothly to the outlet hole 300.

[0033] Furthermore, a sealing ring 3 is provided between the inlet hole 200 and the valve cavity channel 100 to cooperate with the blocking part 12. The inlet hole 200 and the valve cavity channel 100 are connected through the inner cavity of the sealing ring 3 to form a fluid channel. When the blocking part 12 is tightly fitted with the sealing ring 3 under the action of the dynamic elastic element 2, the fluid cannot flow from the inlet hole 200 through the valve cavity channel 100 to the outlet hole 300, thus achieving a one-way sealing effect.

[0034] In this embodiment, the valve core 1 includes a large-diameter section 14 and a small-diameter section 15 connected sequentially along the axial direction. The outer circumferential surface of the large-diameter section 14 slides and guides the valve core 1 within the valve cavity channel 100, thereby guiding the valve core 1 to slide within the valve cavity channel 100. Since the sliding and guiding engagement between the valve core 1 and the valve cavity channel 100 is only achieved through the outer circumferential surface of the large-diameter section 14, the sliding contact area between the valve core 1 and the valve cavity channel 100 is small, resulting in relatively low friction and improving the smoothness of the valve core 1's movement. The blocking part 12 is located at the head end of the large-diameter section 14. The blocking part 12, the large-diameter section 14, and the small-diameter section 15 are coaxially arranged and form an integral structure, ensuring the stability of the valve core 1 during movement.

[0035] Furthermore, the clearance flow groove 13 is provided on the tail end face of the small diameter section 15, the diameter of the large diameter section 14 is larger than the diameter of the small diameter section 15, and an annular gap is formed between the outer peripheral surface of the small diameter section 15 and the inner wall of the valve cavity channel 100. The annular gap and the flow groove 11 together constitute the fluid flow path, wherein the flow groove 11 is the main flow guiding channel, and the annular gap is used to assist in expansion, further improving the fluid flow rate.

[0036] Furthermore, the flow groove 11 includes a first groove 111 on the outer peripheral surface of the large diameter section 14 and a second groove 112 on the outer peripheral surface of the small diameter section 15. The first groove 111 and the second groove 112 are distributed along the axial direction of the valve core 1 and are interconnected to enhance the guiding effect of fluid from the flow groove 11 to the outlet hole 300. The second groove 112 is connected to the avoidance flow groove 13.

[0037] In this embodiment, the valve cavity channel 100 and the outlet hole 300 are connected by a transition cavity 400. The dynamic elastic element 2 is a compression spring. One end of the compression spring presses against the valve core 1, and the other end presses against the wall of the transition cavity 400. Specifically, the compression spring is fitted on the outer periphery of the small diameter section 15 of the valve core 1. One end of the compression spring presses against the end face of the large diameter section 14, and the other end presses against the inner wall of the transition cavity 400, ensuring that the valve core 1 runs smoothly during the reset process.

[0038] In this embodiment, the transition cavity 400 is a tapered constriction structure. The inner wall of the transition cavity 400 gradually narrows from the valve cavity channel 100 towards the outlet hole 300. The large diameter end of the transition cavity 400 matches the diameter of the valve cavity channel 100, and the large diameter end of the transition cavity 400 is connected to the tail end of the valve cavity channel 100. The small diameter end of the transition cavity 400 matches the outlet hole 300, and the small diameter end of the transition cavity 400 is connected to the outlet hole 300. This tapered constriction structure can effectively guide the fluid to accelerate towards the outlet hole 300.

[0039] In this embodiment, the valve body includes an inflow valve body 4 and an outflow valve body 5 mounted on the inflow valve body 4. The inflow hole 200 is provided on the inflow valve body 4, and the valve cavity channel 100 and the outflow hole 300 are both provided on the outflow valve body 5. The sealing ring 3 is provided at the connection between the inflow valve body 4 and the outflow valve body 5 to prevent fluid leakage from the gap between the inflow valve body 4 and the outflow valve body 5. In this way, the one-way valve can use the same sealing ring 3 to simultaneously achieve end face sealing between the inflow valve body 4 and the outflow valve body 5 as well as dynamic sealing between the valve core 1 and the valve cavity channel 100, which effectively simplifies the structure of the one-way valve, reduces the number of sealing elements, and reduces assembly difficulty and production costs.

[0040] When the valve core 1 is pushed by the fluid pressure to overcome the spring force and move towards the outlet hole 300, the blocking part 12 disengages from the sealing ring 3, and the flow groove 11 connects with the inlet hole 200. The fluid enters the transition chamber 400 through the flow groove 11 and the avoidance flow groove 13, and accelerates towards the outlet hole 300 under the guidance of the conical constriction structure, achieving unidirectional flow. When the fluid pressure decreases or disappears, the spring restores its elastic potential energy, pushing the valve core 1 back towards the inlet hole 200, causing the blocking part 12 to re-tighten the sealing ring 3, cutting off the fluid passage and preventing backflow.

[0041] In this embodiment, the inflow valve body 4 is provided with a mounting slot 41, and the inflow hole 200 passes through and communicates with the mounting slot 41. The outflow valve body 5 is provided with a connecting part 51, which is fitted into the mounting slot 41 to fix the inflow valve body 4 and the outflow valve body 5. The sealing ring 3 is provided in the mounting slot 41, and the sealing ring 3 is located between the side of the connecting part 51 away from the outflow valve body 5 and the end face of the mounting slot 41, thereby achieving a seal between the inflow valve body 4 and the outflow valve body 5.

[0042] Furthermore, the connecting part 51 is a boss structure provided at the end of the outflow valve body 5. The first end of the valve cavity channel 100 passes through the connecting part 51 on the side away from the outflow valve body 5 and corresponds to the inner cavity of the sealing ring 3, so that in the initial state, the valve core 1's blocking part 12 presses tightly against the inner edge of the sealing ring 3 to form a seal.

[0043] Furthermore, the inner wall of the mounting slot 41 is provided with an internal thread, and the outer circumferential surface of the connecting part 51 is provided with an external thread that mates with the internal thread, so that the inflow valve body 4 and the outflow valve body 5 are combined and fixed together by a threaded connection. In addition, one end face of the inflow valve body 4 fits against one end face of the outflow valve body 5, thereby limiting the relative position between the inflow valve body 4 and the outflow valve body 5 and preventing the connecting part 51 from excessively compressing the sealing ring 3, which could lead to deformation and failure.

[0044] In this embodiment, the blocking portion 12 includes a sealing boss 121. The diameter of the sealing boss 121 gradually increases from the first end to the last end of the blocking portion 12. The maximum diameter of the sealing boss 121 is greater than the minimum diameter of the inner cavity of the sealing ring 3, so that the sealing boss 121 can be tightly pressed against the surface of the sealing ring 3 when the valve core 1 is reset, ensuring reliable sealing. Furthermore, the blocking portion 12 also includes a sealing connecting platform 122 axially connected to the sealing boss 121. The sealing connecting platform 122 is axially connected to the large-diameter section 14 of the valve core 1. The diameter of the sealing connecting platform 122 is equal to or greater than the maximum diameter of the sealing boss 121, preferably equal to the maximum diameter of the sealing boss 121, to enhance the stability and load-bearing capacity of the sealing structure. Even further, the diameter of the sealing connecting platform 122 is smaller than the diameter of the large-diameter section 14 of the valve core 1, thereby facilitating fluid flow to the outer periphery of the large-diameter section 14 of the valve core 1, thus ensuring fluid flow rate.

[0045] In this embodiment, the inflow valve body 4 is provided with an inflow connector 42, which is located at the end of the inflow valve body 4 opposite to the outflow valve body 5. The other end of the inflow hole 200 extends into the inflow connector 42 and penetrates the end face of the inflow connector 42. The inflow connector 42 is used to connect to the fluid input pipe of a dental treatment device. Furthermore, a plurality of input connection buckles 43 are protruding on the outer peripheral surface of the inflow connector 42 and spaced apart along the axial direction of the inflow connector 42. The input connection buckles 43 are used to contact the inner wall of the fluid input pipe to increase friction and thus prevent the fluid input pipe from slipping during the connection process.

[0046] In this embodiment, the outflow valve body 5 is provided with an outflow connector 52. The outflow connector 52 is located at one end of the outflow valve body 5 opposite to the inflow valve body 4. The other end of the outflow hole 300 extends into the interior of the outflow connector 52 and penetrates the end face of the outflow connector 52. The outflow connector 52 is used to connect to the fluid output pipe of a dental treatment device. Furthermore, a plurality of output connection buckle rings 53 are protruding on the outer peripheral surface of the outflow connector 52 and spaced apart along the axial direction of the outflow connector 52. The output connection buckle rings 53 are used to contact the inner wall of the fluid output pipe to increase friction and thus prevent the fluid output pipe from slipping during the connection process.

[0047] The above description is only a preferred embodiment of the present utility model. Any technical solution that achieves the purpose of the present utility model by essentially the same means shall fall within the protection scope of the present utility model.

Claims

1. A one-way valve for use in dental treatment equipment, comprising a valve body, wherein a valve cavity channel (100) is provided inside the valve body, and an inlet hole (200) and an outlet hole (300) communicating with the valve cavity channel (100) are provided outside the valve body, and a valve core (1) and a dynamic elastic element (2) for driving the valve core (1) to move toward the inlet hole (200) are provided inside the valve cavity channel (100); characterized in that: The outer peripheral surface of the valve core (1) slides and is guided by the inner wall of the valve cavity channel (100). The outer peripheral surface of the valve core (1) is provided with a plurality of flow grooves (11) distributed circumferentially along the outer peripheral surface of the valve core (1). The flow grooves (11) extend along the moving direction of the valve core (1). The valve core (1) has a blocking part (12) at its head end for restricting fluid from flowing from the inlet hole (200) to the valve cavity passage (100). The valve core (1) has an avoidance flow groove (13) on its tail end face. The tail end of the flow groove (11) is connected to the avoidance flow groove (13). The avoidance flow groove (13) corresponds to the input end of the outflow hole (300).

2. The one-way valve applied to a dental treatment device according to claim 1, characterized in that: A sealing ring (3) for cooperating with the blocking part (12) is provided between the inlet hole (200) and the valve cavity channel (100). The inlet hole (200) and the valve cavity channel (100) are connected through the inner cavity of the sealing ring (3) to form a fluid channel. When the blocking part (12) is tightly fitted with the sealing ring (3) under the action of the dynamic elastic element (2), the fluid cannot flow from the inlet hole (200) through the valve cavity channel (100) to the outlet hole (300).

3. A one-way valve for use in dental treatment equipment according to claim 2, characterized in that: The valve core (1) includes a large-diameter section (14) and a small-diameter section (15) connected sequentially along the axial direction. The outer peripheral surface of the large-diameter section (14) is slidably guided to the inner wall of the valve cavity channel (100). The blocking part (12) is provided on the first end of the large-diameter section (14). The clearance flow groove (13) is provided on the end face of the tail end of the small-diameter section (15). The flow groove (11) includes a first groove (111) provided on the outer peripheral surface of the large-diameter section (14) and a second groove (112) provided on the outer peripheral surface of the small-diameter section (15). The first groove (111) and the second groove (112) are interconnected, and the second groove (112) is interconnected with the clearance flow groove (13).

4. A one-way valve for use in dental treatment equipment according to claim 3, characterized in that: The diameter of the large diameter section (14) is greater than the diameter of the small diameter section (15), and an annular gap is formed between the outer circumferential surface of the small diameter section (15) and the inner wall of the valve cavity channel (100).

5. A one-way valve applied to a dental treatment device according to claim 1, characterized in that: The valve cavity channel (100) and the outlet hole (300) are connected through a transition cavity (400). The dynamic elastic element (2) is a compression spring. One end of the compression spring presses against the valve core (1), and the other end presses against the wall of the transition cavity (400).

6. A one-way valve for use in dental treatment equipment according to claim 5, characterized in that: The compression spring is fitted on the outer periphery of the small diameter section (15) of the valve core (1). One end of the compression spring presses against the end face of the large diameter section (14), and the other end presses against the inner wall of the transition cavity (400).

7. A one-way valve for use in dental treatment equipment according to any one of claims 1-6, characterized in that: The valve body includes an inflow valve body (4) and an outflow valve body (5) installed on the inflow valve body (4). The inflow hole (200) is provided on the inflow valve body (4). The valve cavity channel (100) and the outflow hole (300) are both provided on the outflow valve body (5). The sealing ring (3) is provided at the connection between the inflow valve body (4) and the outflow valve body (5).

8. A one-way valve for use in dental treatment equipment according to claim 7, characterized in that: The inflow valve body (4) is provided with an installation slot (41), and the inflow hole (200) passes through and communicates with the installation slot (41). The outflow valve body (5) is provided with a connecting part (51), and the connecting part (51) is installed in the installation slot (41). The sealing ring (3) is located in the installation slot (41), and the sealing ring (3) is located between the side of the connecting part (51) away from the outflow valve body (5) and the end face of the installation slot (41).

9. A one-way valve for use in dental treatment equipment according to claim 8, characterized in that: The first end of the valve cavity channel (100) passes through the connecting part (51) on the side away from the valve body (5) and corresponds to the inner cavity of the sealing ring (3). The inner wall of the mounting slot (41) is provided with an internal thread, and the outer circumferential surface of the connecting part (51) is provided with an external thread that mates with the internal thread.

10. A one-way valve for use in dental treatment equipment according to any one of claims 1-6, characterized in that: The blocking part (12) includes a sealing boss (121), the diameter of which gradually increases from the beginning to the end of the blocking part (12), and the maximum diameter of the sealing boss (121) is greater than the minimum diameter of the inner cavity of the sealing ring (3).

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