One-way valve

Abstract

The one-way valve comprises a valve body and a valve element, the valve body comprises a valve seat and a valve deck, a space defined by the valve seat and the valve deck is a valve cavity, and the valve element can open or close a valve port; a sinking groove is formed in the end, facing the valve seat, of the valve deck. At least part of the valve element can move into the sinking groove from the interior of the valve seat. The end, facing the valve deck, of the valve seat is an annular end, an annular groove is formed in the end, facing the valve seat, of the valve deck, the annular end is contained in the annular groove and fixed, and an annular convex rib is formed in the portion, located between the sinking groove and the annular groove, of the valve deck. In the using process, the valve element part moves back and forth between the interior of the valve seat and the sinking groove of the valve deck. An annular convex rib is formed between the sinking groove and the annular groove, so that when the valve body and the valve cover are assembled and fixed, the annular end is limited in the annular groove, the annular convex rib can play a role in isolating the annular end from the valve element, the annular convex rib limits the annular end, and the side, facing the valve element, of the annular end cannot deform; the deformation of the annular end is prevented from influencing the operation of the valve core to the sinking groove.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of valves, in particular to a one-way valve. BACKGROUND

[0002] In the existing design of one-way valves, the one-way valve is usually composed of a valve cover, a valve seat, a valve core and other components. In order to reduce the client installation size while ensuring the valve core stroke and the flow capacity of the one-way valve, the valve cover is designed as a sunken groove structure. When the valve core has the maximum stroke, part of the valve core can be located in the sunken groove. However, when the valve cover and the valve seat are made of, for example, plastic material, the valve cover and the valve seat are prone to deformation during the fixing connection, and the deformed valve seat is prone to affect the stroke of the piston, resulting in that the valve core cannot stably run into the sunken groove.

[0003] How to avoid the valve core from being unable to stably run into the sunken groove due to the deformation of the valve seat during the connection of the valve cover and the valve seat has become an important issue to be solved in the related field. CONTENT OF THE INVENTION

[0004] One main purpose of the present disclosure is to overcome at least one defect of the prior art described above, and to provide a one-way valve which can avoid deformation during the fixing of the valve seat and the valve cover and has a smaller size.

[0005] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0006] According to one aspect of the present disclosure, a one-way valve is provided, wherein: the one-way valve comprises a valve body and a valve core, the valve body comprises a valve cover and a valve seat, a space surrounded by the valve cover and the valve seat is a valve cavity, the valve core can move in the valve cavity in the axial direction to open or close a valve port of the valve cavity; the valve cover is further provided with a sunken groove at one end facing the valve seat, and at least part of the valve core can move from the inside of the valve seat to the sunken groove; one end of the valve seat facing the valve cover is a ring-shaped end, the valve cover is provided with a ring-shaped groove at one end facing the valve seat, the ring-shaped end is accommodated in the ring-shaped groove and fixed, and the ring-shaped groove is arranged at intervals around the outer periphery of the sunken groove, so that the part of the valve cover between the sunken groove and the ring-shaped groove forms a ring-shaped protruding rib.

[0007] According to one embodiment of the present disclosure, the ring-shaped end is accommodated in the ring-shaped groove and is assembled by press riveting.

[0008] According to one of the embodiments of the present disclosure, the valve cover is internally provided with a second cavity in communication with the sink, the inner diameter of the sink is larger than the inner diameter of the second cavity, so that the part of the sink bottom not occupied by the second cavity forms a limiting step; the valve core comprises a body part and a limiting part, the limiting part is arranged at one end of the body part facing the valve port; the body part moves axially in the second cavity; the limiting part can move from the inside of the valve seat into the sink, and is blocked by the limiting step from entering the second cavity.

[0009] According to one of the embodiments of the present disclosure, the valve seat is internally provided with a first cavity, the cavity wall of one end of the valve cover is provided with a ring-shaped accommodating groove, the ring-shaped protruding rib is accommodated in the ring-shaped accommodating groove, the ring-shaped accommodating groove has a first groove wall facing the outer circumferential surface of the ring-shaped protruding rib, and the first groove wall is pressed against the outer circumferential surface of the ring-shaped protruding rib.

[0010] According to one of the embodiments of the present disclosure, the ring-shaped protruding rib has an end surface facing the valve seat, the ring-shaped accommodating groove has a second groove wall facing the valve cover, and the second groove wall has a gap with the end surface of the ring-shaped protruding rib.

[0011] According to one of the embodiments of the present disclosure, in the radial direction, the thickness of the ring-shaped protruding rib is equal to the groove depth of the ring-shaped accommodating groove.

[0012] According to one of the embodiments of the present disclosure, the material of the valve seat is plastic, and the valve seat is formed by injection molding.

[0013] According to one of the embodiments of the present disclosure, in the axial direction, the groove bottom of the sink is farther away from the valve port than the groove bottom of the ring-shaped recess.

[0014] According to one of the embodiments of the present disclosure, in the axial direction, the length of the outer side groove wall of the ring-shaped recess is greater than the length of the inner side groove wall thereof, and the outer circumferential surface of the ring-shaped protruding rib defines the inner side groove wall.

[0015] According to one of the embodiments of the present disclosure, one end of the valve cover facing the valve seat is provided with a ring-shaped outer circumferential wall, the outer circumferential wall is arranged around the ring-shaped protruding rib at intervals, so that the ring-shaped recess is formed between the outer circumferential wall and the ring-shaped protruding rib; wherein the thickness of the ring-shaped protruding rib is greater than the thickness of the outer circumferential wall.

[0016] From the above technical solutions, the one-way valve provided by the present disclosure has the following advantages and positive effects:

[0017] The one-way valve provided by the present disclosure comprises a valve body and a valve core, the valve body comprises a valve seat and a valve cover, a space surrounded by the valve seat and the valve cover is a valve cavity, and the valve core can open or close a valve port; a sink is arranged at one end of the valve cover facing the valve seat, and at least part of the valve core can move from inside the valve seat to the sink; the end of the valve seat facing the valve cover is a ring-shaped end, the valve cover is provided with a ring-shaped groove at the end facing the valve seat, the ring-shaped end is accommodated in the ring-shaped groove and fixed, and the part of the valve cover between the sink and the ring-shaped groove forms a ring-shaped protrusion. During use, part of the valve core moves back and forth between the inside of the valve seat and the sink of the valve cover; the ring-shaped protrusion is formed between the sink and the ring-shaped groove, and accordingly, when the valve body and the valve cover are assembled and fixed, the ring-shaped end is limited in the ring-shaped groove, the ring-shaped protrusion can play a role of isolating the ring-shaped end and the valve core, the ring-shaped end is limited by the ring-shaped protrusion, and the side of the ring-shaped end facing the valve core cannot be deformed, thereby avoiding that the deformation of the ring-shaped end affects the operation of the valve core to the sink. BRIEF DESCRIPTION OF DRAWINGS

[0018] The various objects, features and advantages of the present disclosure will become more apparent from the following detailed description of preferred embodiments of the present disclosure considered in conjunction with the drawings. The drawings are not intended to be drawn to scale. In the drawings, the same or similar reference numerals indicate the same or similar components throughout the several views. Among them:

[0019] Figure 1 is a perspective structural schematic diagram of a one-way valve according to an exemplary embodiment;

[0020] Figure 2 and Figure 3 are respectively Figure 1 axial side sectional views of the one-way valve in two different states shown;

[0021] Figure 4 is an enlarged schematic diagram of part A in Figure 2 ;

[0022] Figure 5 is a perspective exploded schematic diagram of the one-way valve shown in Figure 1 ;

[0023] Figure 6 is a perspective structural schematic diagram of a valve seat shown in Figure 5 ;

[0024] Figure 7 is a perspective structural schematic diagram of a valve cover shown in Figure 5 ;

[0025] Figure 8 is a perspective structural schematic diagram of a valve core shown in Figure 5 .

[0026] The reference numerals are explained as follows:

[0027] 100. valve seat;

[0028] 101. first cavity;

[0029] 102. valve port;

[0030] 110. ring-shaped end;

[0031] 120. ring-shaped accommodating groove;

[0032] 200. valve cover;

[0033] 201. second cavity;

[0034] 210. sink;

[0035] 211. limiting step;

[0036] 220. ring-shaped groove;

[0037] 2201. outer groove wall;

[0038] 2202. inner groove wall;

[0039] 230. ring-shaped convex rib;

[0040] 240. peripheral wall;

[0041] 300. valve core;

[0042] 310. body portion;

[0043] 320. limiting portion;

[0044] D1. thickness;

[0045] D2. thickness;

[0046] G. gap. DETAILED DESCRIPTION

[0047] Typical embodiments embodying the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can be varied in a wide range of embodiments, none of which depart from the scope of the present disclosure, and that the description and drawings are to be considered in an illustrative sense only, and not to be used to limit the present disclosure.

[0048] In the following description of different example embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration different example structures, systems, and steps in which aspects of the present disclosure can be practiced. It is understood that other specific arrangements of parts, structures, example devices, systems, and steps can be utilized and structural and functional modifications can be made without departing from the scope of the present disclosure. Also, while the terms "over," "between," "inner," and the like can be used in the present specification to describe different example features and elements of the present disclosure, these terms are used in the present disclosure for the convenience of the reader and are not intended to limit the scope of the present disclosure to only those embodiments and examples that are described herein. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of structures in order to fall within the scope of the present disclosure.

[0049] Referring to Figure 1 , a perspective view schematically shows a one-way valve according to the present disclosure. In this example embodiment, the one-way valve according to the present disclosure is described by way of example as a valve applied to a refrigeration system. It is readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes can be made to the following detailed description in order to apply the relevant design of the present disclosure to other application scenarios, and such changes are still within the scope of the principle of the one-way valve according to the present disclosure.

[0050] As shown in Figure 1 , in an embodiment of the present disclosure, the one-way valve according to the present disclosure includes a valve body and a valve core 300. The valve body is internally provided with a valve cavity, and the valve body includes a valve seat 100 and a valve cover 200. The space enclosed by the valve seat 100 and the valve cover 200 is the valve cavity, and the valve cavity has a valve port 102. For example, the valve cavity can be jointly formed by at least a first cavity 101 of the valve seat 100, a second cavity 201 of the valve cover 200, and a sink groove 210 of the valve cover 200. The valve core 300 is arranged in the valve cavity and can move in the axial direction. The valve core 300 is used to open or close the valve port 102. For reference, see Figures 2 to 8 , Figure 2 and Figure 3 , which respectively schematically show axial cross-sectional views of the one-way valve in two different states, wherein Figure 2 , a cross-sectional structure is specifically shown when the valve core 300 closes the valve port 102, Figure 3 , a cross-sectional structure is specifically shown when the valve core 300 is in a fully open state; Figure 4 , a zoomed-in view of part A in Figure 2 is schematically shown; Figure 5 , a perspective exploded view of the one-way valve is schematically shown; Figure 6 , a perspective view of the valve seat 100 is schematically shown; Figure 7 , a perspective view of the valve cover 200 is schematically shown; Figure 8The figure shows a representative three-dimensional structural diagram of the valve core 300. The structure, connection method, and functional relationship of the main components of the one-way valve proposed in this disclosure will be described in detail below with reference to the above figures.

[0051] like Figures 1 to 8 As shown, in one embodiment of this disclosure, the valve cover 200 facing the valve seat 100 is further provided with a recess 210, and at least a portion of the valve core 300 can move from inside the valve seat 100 into the recess 210. The end of the valve seat 100 facing the valve cover 200 is an annular end 110, and the end of the valve cover 200 facing the valve seat 100 is provided with an annular groove 220, the annular end 110 being accommodated in and fixed within the annular groove 220. The annular grooves 220 are arranged at intervals around the outer periphery of the recess 210, so that the portion of the valve cover 200 located between the recess 210 and the annular groove 220 forms an annular rib 230. During use, the valve core 300 moves back and forth between the valve seat 100 and the groove 210 of the valve cover 200. An annular rib 230 is formed between the groove 210 and the annular groove 220. Accordingly, when the valve body and the valve cover 200 are assembled and fixed, the annular end 110 is limited in the annular groove 220. The annular rib 230 can isolate the annular end 110 from the valve core 300 (e.g., the limiting part 320). The annular rib 230 limits the annular end 110, and the side of the annular end 110 facing the valve core 300 cannot be deformed, thus preventing the deformation of the annular end 110 from affecting the operation of the valve core 300 to the groove 210.

[0052] In one embodiment of this disclosure, the annular end 110 is accommodated in the annular groove 220 and riveted together. Since this disclosure can ensure that the outer peripheral surface of the annular rib 230 and the inner peripheral surface of the annular end 110 are always pressed together, it can prevent the valve body from being deformed by external forces during the riveting process, and avoid damage to the one-way valve structure or assembly failure.

[0053] like Figure 2 As shown, in one embodiment of this disclosure, the thickness D1 of the annular rib 230 can be 0.5mm to 1.2mm, for example, 0.5mm, 0.6mm, 0.8mm, 1mm, 1.2mm, etc., specifically, for example, 0.75mm. Through the above structural design, this disclosure can avoid the annular rib 230 having insufficient support for the annular end 110 of the valve seat 100 due to its thickness D1 being too small, and at the same time, it can avoid the one-way valve having excessively large radial dimensions due to the thickness D1 of the annular rib 230 being too large.

[0054] In an embodiment of the present disclosure, the valve cover 200 is internally provided with a second cavity 201 in communication with the sink 210, and the inner diameter of the sink 210 is greater than that of the second cavity 201, so that the portion of the sink 210 not occupied by the second cavity 201 forms a limiting step 211. The valve core 300 includes a body part 310 and a limiting part 320, and the limiting part 320 is arranged at one end of the body part 310 facing the valve port 102. The second cavity 201 and the sink 210 are respectively used to accommodate the body part 310 and the limiting part 320, so that the limiting step 211 and the limiting part 320 on the side away from the valve port 102 are limited to cooperate. The body part 310 moves axially in the second cavity 201; the limiting part 320 can move from the inside of the valve seat 100 into the sink 210, and is blocked by the limiting step 211 from entering the second cavity 201. Through the above structural design, the present disclosure can ensure that there is a gap between the sink wall of the sink 210 and the limiting part 320, thereby avoiding friction between the valve core 300 and the sink wall of the sink 210 when the valve core 300 moves, and ensuring smooth movement of the valve core 300 in the valve cavity.

[0055] As shown in the drawings, Figures 4 to 6 In an embodiment of the present disclosure, the first cavity 101 of the valve seat 100 is internally provided with a first cavity 101, and the cavity wall of one end of the valve cover 200 adjacent to the first cavity 101 of the valve seat 100 can be provided with a ring-shaped accommodating groove 120, and the ring-shaped protruding rib 230 can be accommodated in the ring-shaped accommodating groove 120. Among them, the ring-shaped accommodating groove 120 has a first groove wall facing the outer circumferential surface of the ring-shaped protruding rib 230, and the first groove wall is pressed against the outer circumferential surface of the ring-shaped protruding rib 230, and the first groove wall is the inner circumferential surface of the ring-shaped end 110. Through the above structural design, the present disclosure can accommodate the ring-shaped protruding rib 230 by using the ring-shaped accommodating groove 120, which is conducive to further reducing the product size of the one-way valve in the radial direction.

[0056] As shown in the drawings, Figure 4 Based on the structure that the ring-shaped protruding rib 230 is accommodated in the ring-shaped accommodating groove 120, in an embodiment of the present disclosure, the ring-shaped protruding rib 230 has an end surface facing the valve seat 100, and the ring-shaped accommodating groove 120 has a second groove wall facing the valve cover 200, and the second groove wall and the end surface of the ring-shaped protruding rib 230 can have a gap G. Through the above structural design, when the valve seat 100 and the valve cover 200 are fixed, the present disclosure avoids the second groove wall and the end surface of the ring-shaped protruding rib 230 from contacting, which can ensure the assembly effect of the ring-shaped end 110 and the ring-shaped groove 220, and specifically can ensure that the one end of the ring-shaped end 110 facing the valve cover 200 is pressed and abuts on the groove bottom of the ring-shaped groove 220.

[0057] As shown in the drawings, Figure 4As shown, based on the structural design that the annular protrusion 230 is accommodated in the annular accommodation groove 120, in an embodiment of the present disclosure, the thickness D1 of the annular protrusion 230 can be equal to the groove depth of the annular accommodation groove 120 in the radial direction. Through the above structural design, since the first groove wall of the annular accommodation groove 120 is pressed against the outer circumferential surface of the annular protrusion 230, the present disclosure can realize that the inner circumferential surface of the annular protrusion 230 is flush with the part of the cavity wall of the first cavity 101 which is not provided with the annular accommodation groove 120.

[0058] In an embodiment of the present disclosure, the material of the valve seat 100 can be plastic, and the valve seat 100 is formed by using an injection molding process. For the prior solution using the injection molding process, the overall size of the product is relatively long, which leads to a relatively high injection molding cost, and the cavity wall of the valve cavity (for example, the cavity wall of the first cavity 101) has a significant draft angle due to the relatively long size, which leads to a relatively low overall size precision. In this regard, since the present disclosure can significantly reduce the axial size compared to the prior solution without the sink groove, the valve seat 100 of the present disclosure can improve the overall size precision when formed by using the injection molding process.

[0059] Further, when the cavity wall of the first cavity 101 is provided with the annular accommodation groove 120, the present disclosure only needs to control the size precision of the part of the cavity wall of the first cavity 101 which cooperates with the valve cover 200 (for example, the first groove wall of the annular accommodation groove 120) when processing the valve seat 100, without the need for accurate size control of the cavity wall of the entire area of the first cavity 101, thereby greatly reducing the difficulty of the injection molding process, reducing the injection molding process cost, and being beneficial to improving the product yield.

[0060] As shown in Figure 2 and Figure 4 In an embodiment of the present disclosure, the groove bottom of the sink groove 210 can be farther away from the valve port 102 than the groove bottom of the annular groove 220 in the axial direction. Through the above structural design, since the sink groove 210 needs to ensure the total stroke of the valve core 300, and the annular groove 220 is only used for assembly and is irrelevant to the total stroke, the depth of the annular groove 220 does not need to be greater than or equal to the depth of the sink groove 210, and only needs to be able to fix the valve seat 100 and the valve cover 200, so that the present disclosure adopts the annular groove 220 with a smaller depth compared to the sink groove 210, which can reduce the processing difficulty of the parts.

[0061] As shown in Figure 2 and Figure 4As shown in the embodiment of the present disclosure, the length of the outer groove wall 2201 of the annular groove 220 is greater than the length of the inner groove wall 2202 of the annular groove 220 in the axial direction, and the outer circumferential surface of the annular protrusion 230 defines the inner groove wall 2202. In other words, the end of the outer groove wall 2201 of the annular groove 220 facing the valve seat 100 is closer to the valve port 102 than the end of the inner groove wall 2202 facing the valve seat 100. Through the above structural design, the present disclosure can facilitate the riveting and bending of the annular end 110 in the annular groove 220. In some embodiments, the length of the outer groove wall 2201 of the annular groove 220 can also be equal to or less than the length of the inner groove wall 2202, and the present embodiment is not limited thereto.

[0062] As shown in the embodiment of the present disclosure, the end of the outer groove wall 2201 of the annular groove 220 facing the valve seat 100 is closer to the valve port 102 than the end of the inner groove wall 2202 facing the valve seat 100. Through the above structural design, the present disclosure can facilitate the riveting and bending of the annular end 110 in the annular groove 220. In some embodiments, the length of the outer groove wall 2201 of the annular groove 220 can also be equal to or less than the length of the inner groove wall 2202, and the present embodiment is not limited thereto. Figure 2 Figure 4 As shown in the embodiment of the present disclosure, the end of the outer groove wall 2201 of the annular groove 220 facing the valve seat 100 is closer to the valve port 102 than the end of the inner groove wall 2202 facing the valve seat 100. Through the above structural design, the present disclosure can facilitate the riveting and bending of the annular end 110 in the annular groove 220. In some embodiments, the length of the outer groove wall 2201 of the annular groove 220 can also be equal to or less than the length of the inner groove wall 2202, and the present embodiment is not limited thereto.

[0063] It should be noted that the one-way valve shown in the drawings and described in the specification is only a few examples of many one-way valves that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details or any components of the one-way valve shown in the drawings or described in the specification.

[0064] ​In summary, the one-way valve provided by the present disclosure includes a valve body and a valve core 300, the valve body includes a valve seat 100 and a valve cover 200, the space surrounded by the valve seat 100 and the valve cover 200 is a valve cavity, and the valve core 300 can open or close a valve port 102; the valve core 300 includes a body part 310 and a limiting part 320, the limiting part 320 is arranged at one end of the body part 310 facing the valve port 102, and the outer diameter of the limiting part 320 is greater than that of the body part 310; a sink 210 is arranged at one end of the valve cover 200 facing the valve seat 100, and at least part of the valve core 300 can move from the inside of the valve seat 100 to the sink 210; a second cavity 201 and the sink 210 are respectively used to accommodate the body part 310 and the limiting part 320, so that a limiting step 211 and the side of the limiting part 320 away from the valve port 102 are limitedly matched; one end of the valve seat 100 facing the valve cover 200 is a ring-shaped end 110, the valve cover 200 is provided with a ring-shaped groove 220 at one end facing the valve seat 100, the ring-shaped end 110 is accommodated in the ring-shaped groove 220 and fixed, and the part of the valve cover 200 between the sink 210 and the ring-shaped groove 220 forms a ring-shaped convex rib 230. During use, part of the valve core 300 moves back and forth between the inside of the valve seat 100 and the sink 210 of the valve cover 200; the ring-shaped convex rib 230 is formed between the sink 210 and the ring-shaped groove 220, and accordingly, when the valve body and the valve cover 200 are assembled and fixed, the ring-shaped end 110 is limited in the ring-shaped groove 220, the ring-shaped convex rib 230 can play a role of isolating the ring-shaped end 110 and the valve core 300 (for example, the limiting part 320), the ring-shaped convex rib 230 limits the ring-shaped end 110, and the side of the ring-shaped end 110 facing the valve core 300 cannot be deformed, thereby avoiding that the deformation of the ring-shaped end 110 affects the operation of the valve core 300 to the sink 210.

[0065] The exemplary embodiments of the one-way valve provided by the present disclosure are described and / or illustrated in detail above. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein, but rather, components of each embodiment can be used independently and separately from other components described herein. Each component of each embodiment can also be used in combination with other components of the other embodiments. The word “comprising” and “containing” as used herein is used in the sense of “including”, and the word “comprising” when used in a claim, should not be construed as a statistical requirement. Similarly, the word “based” should not be construed as a statistical requirement. The terms “first”, “second” and the like do not denote any order, quantity, composition, or importance, but rather are used to distinguish one element from another.

[0066] While the one-way valve presented in the disclosure has been described in terms of different particular embodiments, those skilled in the art will recognize that modifications can be made to the embodiments of the disclosure without departing from the spirit and scope of the claims.

Claims

1. A one-way valve characterized in that: the one-way valve comprises a valve body and a valve core (300), the valve body comprises a valve seat (100) and a valve cover (200), a space surrounded by the valve seat (100) and the valve cover (200) is a valve cavity, the valve core (300) can move axially in the valve cavity to open or close a valve port (102) of the valve cavity; an end of the valve cover (200) facing the valve seat (100) is further provided with a sink (210), at least part of the valve core (300) can move from inside the valve seat (100) to the sink (210); an end of the valve seat (100) facing the valve cover (200) is a ring-shaped end (110), an end of the valve cover (200) facing the valve seat (100) is provided with a ring-shaped groove (220), the ring-shaped end (110) is accommodated in and fixed in the ring-shaped groove (220), the ring-shaped groove (220) is arranged at intervals around the outer periphery of the sink (210), so that the part of the valve cover (200) between the sink (210) and the ring-shaped groove (220) forms a ring-shaped protrusion (230).

2. The one-way valve of claim 1, wherein The ring-shaped end (110) is accommodated in and press riveted in the ring-shaped groove (220).

3. The one-way valve of claim 1, wherein, A second cavity (201) in communication with the sink (210) is arranged in the valve cover (200), the inner diameter of the sink (210) is greater than the inner diameter of the second cavity (201), so that the part of the sink (210) not occupied by the second cavity (201) forms a limiting step (211); the valve core (300) comprises a body part (310) and a limiting part (320), the limiting part (320) is arranged at an end of the body part (310) facing the valve port (102); the body part (310) moves axially in the second cavity (201); the limiting part (320) can move from inside the valve seat (100) to the sink (210), and is blocked by the limiting step (211) from entering the second cavity (201).

4. The one-way valve of claim 1, wherein A first cavity (101) is arranged inside the valve seat (100), a ring-shaped accommodating groove (120) is arranged on the cavity wall of one end of the valve cover (200) adjacent to the first cavity (101), the ring-shaped protrusion (230) is accommodated in the ring-shaped accommodating groove (120), the ring-shaped accommodating groove (120) has a first groove wall facing the outer peripheral surface of the ring-shaped protrusion (230), and the first groove wall is pressed against the outer peripheral surface of the ring-shaped protrusion (230).

5. The one-way valve of claim 4, wherein, The ring-shaped protrusion (230) has an end surface facing the valve seat (100), the ring-shaped accommodating groove (120) has a second groove wall facing the valve cover (200), and a gap (G) is formed between the end surface of the ring-shaped protrusion (230) and the second groove wall.

6. The one-way valve of claim 4, wherein, In the radial direction, the thickness (D1) of the ring-shaped protrusion (230) is equal to the groove depth of the ring-shaped accommodating groove (120).

7. The one-way valve of claim 1, wherein The material of the valve seat (100) is plastic, and the valve seat (100) is formed by injection molding.

8. The one-way valve of claim 1, wherein, In the axial direction, the groove bottom of the sink groove (210) is farther away from the valve port (102) than the groove bottom of the ring-shaped groove (220).

9. The one-way valve of claim 1, wherein, In the axial direction, the length of the outer side groove wall (2201) of the ring-shaped groove (220) is greater than the length of the inner side groove wall (2202), and the outer circumferential surface of the ring-shaped convex rib (230) defines the inner side groove wall (2202).

10. The one-way valve of claim 1, wherein, The end of the valve cover (200) facing the valve seat (100) is provided with a ring-shaped outer circumferential wall (240), which is arranged around the ring-shaped convex rib (230) at intervals, so that the ring-shaped groove (220) is formed between the outer circumferential wall (240) and the ring-shaped convex rib (230); wherein the thickness (D1) of the ring-shaped convex rib (230) is greater than the thickness (D2) of the outer circumferential wall (240).

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