One-way valve and valve island

Abstract

The utility model discloses a one-way valve and a valve terminal, and relates to the technical field of one-way valves, the one-way valve comprises a valve body and a valve core assembly, the valve core assembly comprises a valve cover, a valve core and an elastic piece, the valve cover is connected with the valve body, and the valve cover is provided with a containing cavity; the elastic piece is arranged in the containing cavity, the valve element comprises a rod body and a piston part arranged at one end of the rod body, and the valve element abuts against the elastic piece; the piston part can abut against the valve port in a sealed mode under the elastic force effect of the elastic piece. According to the check valve, the structure of the check valve is optimized, a valve seat is omitted, the valve element directly opens / closes the valve port of the valve body, the size of the valve body is not increased while the caliber of the valve port is increased, and therefore the check valve can be applied to the situation that the space is limited and a large-caliber valve port is needed.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, and particularly relates to a check valve and a valve island. Background Art

[0002] The basic structure of a check valve usually includes a valve body, a valve seat, a valve core, a spring and a seal. The valve seat is the part with which the valve core makes sealing contact to close the valve. The valve seat and the valve body are hermetically connected through a seal. The valve core uses the force of the spring to contact the valve seat to control the opening and closing of the valve, so as to achieve the purpose of preventing fluid backflow. At present, in the scenario where a larger flow valve port inner diameter needs to be provided, to ensure the sealing performance of the check valve, the overall size of the check valve becomes larger. However, due to the limited external installation space and the relatively large overall installation size of the check valve, the installation is inconvenient. Summary of the Utility Model

[0003] The main object of the utility model is to propose a check valve and a valve island applying the check valve, by canceling the valve seat of the check valve, optimizing the structure of the check valve; while increasing the valve port inner diameter of the check valve, ensuring the performance of the check valve; compared with the check valve with the same valve port inner diameter, the size of the valve body can be reduced, and the size of the valve island applying the check valve can also be reduced, which is applicable to the scenario where the space is limited and the valve port flow needs to be increased.

[0004] To achieve the above object, the valve core assembly proposed by the utility model includes a valve body and a valve core assembly. The valve body includes a valve cavity with a valve port; the valve core assembly includes a valve cover, an elastic member and a valve core. The valve cover is connected to the valve body, and the valve cover is provided with a receiving cavity; the elastic member is arranged in the receiving cavity. The valve core includes a rod body and a piston part arranged at one end of the rod body. The valve core abuts against the elastic member; the piston part can hermetically abut against the valve port under the elastic force of the elastic member.

[0005] In an embodiment, the rod body is provided with a hollow cavity, the elastic member is a spring, one end of the spring is arranged in the hollow cavity, and the other end abuts against the bottom of the receiving cavity.

[0006] In an embodiment, the end of the rod body is provided with a fixing groove communicating with the hollow cavity, and the other end of the spring is arranged in the fixing groove.

[0007] In an embodiment, the elastic member is a spring, the spring sleeves the rod body, one end of the spring abuts against the piston part, and the other end abuts against the bottom of the receiving cavity.

[0008] In an embodiment, a guiding structure is provided on the rod wall of the rod body and the cavity wall of the receiving cavity, and the guiding structure plays a guiding role when the rod body moves axially relative to the valve cover.

[0009] In one embodiment, the guiding structure includes a positioning protrusion provided on the rod wall of the rod body and a guiding groove provided on the cavity wall of the accommodating cavity corresponding to the positioning protrusion. The guiding groove extends along the axial direction of the accommodating cavity, and the positioning protrusion is movably arranged in the guiding groove.

[0010] In one embodiment, at least one cut surface is provided on the outer peripheral surface of the rod body along the axial direction and / or at least one cut surface is provided on the inner wall of the accommodating cavity.

[0011] In one embodiment, the cut surface extends from one end of the rod body to the other end; or the cut surface extends from the cavity opening of the accommodating cavity to the cavity bottom of the accommodating cavity.

[0012] In one embodiment, the length of the cut surface in the axial direction of the rod body is greater than the movement stroke of the rod body relative to the valve cover.

[0013] In one embodiment, the rod body is further provided with an exhaust hole communicating with the hollow cavity.

[0014] In one embodiment, the piston portion is provided with a sealing groove for assembling a sealing ring, and the piston portion and the cavity wall of the valve port squeeze the sealing ring to seal.

[0015] In one embodiment, the valve port is arranged as a tapered port with a gradually decreasing diameter in the direction away from the piston portion. A tapered surface is provided on the circumferential direction of the piston portion and is inclined in the direction away from the end of the rod body. The tapered surface cooperates with the cavity wall of the tapered port.

[0016] In one embodiment, the valve core is an injection molded part.

[0017] In one embodiment, the valve cover includes a cover body section connected to the valve body and a cap head provided above the cover body section for clamping. An installation groove for assembling a sealing member is further provided on the circumferential side of the cover body section, and the valve body and the cover body section squeeze the sealing member.

[0018] The present utility model further provides a valve island, which includes a base and the one-way valve as described above. The valve body is configured as the base; or the valve body is installed on the base.

[0019] For the one-way valve provided by the present utility model, the intermediate part "valve seat" is cancelled. On the one hand, the structure of the one-way valve can be simplified, the number of components can be reduced, thereby reducing the manufacturing cost and potential failure points; on the other hand, when the valve core and the valve body cooperate to increase the diameter of the valve port, the size of the valve body remains unchanged, that is, cancelling the valve seat can further reduce the overall size of the one-way valve, which is convenient for product miniaturization, so it can be applied to the scenario where space is limited and a large-diameter valve port is required. At the same time, since the fluid is not blocked by the valve seat, the flow resistance of the one-way valve is reduced, thereby improving the performance of the one-way valve using this structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 FIG. [ID] is a schematic structural diagram of an embodiment of the one-way valve provided by the present invention;

[0022] Figure 2 FIG. [ID] is a schematic structural diagram of another embodiment of the one-way valve provided by the present invention;

[0023] Figure 3 FIG. [ID] is a three-dimensional structural diagram of an embodiment of the valve core;

[0024] Figure 4 FIG. [ID] is a sectional structural diagram of an embodiment of the valve core;

[0025] Figure 5 FIG. [ID] is a sectional structural diagram of another embodiment of the valve core;

[0026] Figure 6 FIG. [ID] is a sectional structural diagram of an embodiment of the valve cover;

[0027] Figure 7 For Figure 6 FIG. [ID] is a structural diagram of the valve cover from another perspective.

[0028] Explanation of the reference numerals in the drawings:

[0029] 100, one-way valve; 200, valve core assembly; 210, valve cover; 211, cover body section; 212, cap head; 213, installation groove; 214, accommodation cavity; 220, valve core; 221, rod body; 222, piston part; 223, hollow cavity; 224, fixing groove; 225, cutting surface; 226, exhaust hole; 227, sealing groove; 228, conical surface; 230, elastic member; 231, spring; 240, guiding structure; 241, positioning protrusion; 242, guiding groove; 243, step; 300, valve body; 301, valve cavity; 310, valve port; 320, first flow channel; 330, second flow channel.

[0030] The realization of the objectives, functional features, and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0034] The basic structure of a check valve generally includes a valve body, a valve seat, a valve core, a spring, and a seal. The valve seat is the part with which the valve core makes sealing contact to close the valve. The valve seat and the valve body are sealed and connected through a seal. The valve core uses the force of the spring to contact the valve seat to control the opening and closing of the valve, thereby achieving the purpose of preventing fluid backflow. Currently, in scenarios where a larger flow valve port inner diameter needs to be provided, to ensure the sealing performance of the check valve, the overall size of the check valve becomes larger. However, due to limited external installation space and the relatively large overall installation size of the check valve, it is inconvenient to install.

[0035] Please refer to Figure 1 and Figure 2, in an embodiment of the present utility model, the one-way valve 100 includes a valve core assembly 200 and a valve body 300. The valve core assembly 200 includes a valve cover 210 and a valve core 220. The valve body 300 has a valve cavity 301. A first flow channel 320 communicating with the valve cavity 301 is provided at the bottom of the valve body 300, and a second flow channel 330 communicating with the valve cavity 301 is provided at the side of the valve body 300. The valve cover 210 is hermetically connected to the valve body 300. The valve core 220 is located in the valve cavity 301. The piston portion 222 of the valve core 220 hermetically abuts against the valve port 310 communicating the first flow channel 320 and the second flow channel 330 under the action of an elastic member 230.

[0036] During operation, the fluid (gas or liquid) pushes open the valve core 220 and flows from the first flow channel 320 into the second flow channel 330 through the valve port 310. When the fluid pressure decreases, the elastic member 230 causes the piston portion 222 to abut against and close the valve port 310, interrupting the fluid.

[0037] The present utility model provides a one-way valve 100, which can be integrated into a valve island and serve as one of the valve gates in the valve island. The valve island is composed of multiple electrically controlled valves (such as pneumatic valves), combined together by a central control unit and an air supply system, and connected to a programmable logic controller (PLC) or other control systems for controlling a certain number of valves and their signal processing processes.

[0038] The valve island includes a base (not shown in the figure). In one embodiment, the base is configured as the valve body 300, that is, the valve body 300 is formed integrally with the base. The valve body 300 serves as the base of the valve island and integrates multiple functions; the valve body 300 of the one-way valve 100 directly constitutes the base of the valve island. In addition to including the valve cavity 301 required for the one-way valve 100 itself, the valve body 300 also ingeniously integrates multiple additional flow channels, which are reserved for other types of valve gates, so as to realize the integrated installation of multi-functional valves on the same valve island.

[0039] In another embodiment, the valve body 300 is separately installed on the base and together with other electromagnetic valve gates, pneumatic valves, etc. constitutes a valve island. The one-way valve 100 is a part of the valve island. In this configuration, the valve body of the one-way valve 100 is designed as an independent unit and is directly but independently installed on the valve island seat of the valve island through appropriate interfaces and fixing methods. This separated design allows for more convenient installation and maintenance of the one-way valve 100, and at the same time does not hinder the layout and installation of other valves or components on the valve island.

[0040] In addition, the one-way valve 100 can also be used alone in occasions where it is necessary to prevent the fluid in the system from flowing backward, including but not limited to refrigeration systems, plumbing systems, air conditioning systems installed in vehicles, transfer cases installed in automobiles, front / rear axle positions, etc.

[0041] Refer to Figure 1 and Figure 2, the valve port 310 is provided on the valve body 300. When the fluid force is less than the elastic force of the elastic member 230, the piston portion 222 is in sealing contact with the valve port 310 under the elastic force of the elastic member 230, blocking the communication between the first flow channel 320 and the second flow channel 330; when the fluid force is greater than the elastic force of the elastic member 230, the piston portion 222 is separated from the valve port 310, the first flow channel 320 and the second flow channel 330 are communicated, and the fluid passes from the first flow channel 320 through the valve port 310 through the second flow channel 330.

[0042] The present utility model cancels the intermediate part "valve seat". On the one hand, it can simplify the structure of the one-way valve 100, reduce the number of components, thereby reducing the manufacturing cost and potential failure points; on the other hand, canceling the valve seat can further reduce the overall size of the one-way valve 100, facilitate the miniaturization of the product, and be suitable for installation in occasions with limited space. At the same time, since the fluid is not blocked by the valve seat, the flow resistance of the one-way valve 100 is reduced, thereby improving the performance of the one-way valve 100 using this structure.

[0043] Refer to Figures 1 to 3 , in an embodiment, the rod body 221 is provided with a hollow cavity 223, the elastic member 230 is a spring 231, one end of the spring 231 is arranged in the hollow cavity 223, and the other end abuts against the bottom of the receiving cavity 214. Arranging the elastic member 230 between the receiving cavity 214 and the hollow cavity 223 of the valve core 220 can also make the structure of the one-way valve 100 more compact and further control the size of the valve body 300 of the one-way valve 100. The valve core 220 is an injection-molded part formed by injection molding. The rod body 221 of the valve core 220 provided with the hollow cavity 223, on the one hand, reduces the cost and material consumption of the valve core 220, and on the other hand, can control the mold flow during the injection molding process, making the wall thickness of the hollow cavity 223 uniform, so that the finished product of the valve core 220 has high consistency and good stability, and further reduces the collision resistance between the valve core 220 and the valve cover 210 during the movement process. In other embodiments, refer to Figure 2 , the spring 231 is sleeved outside the rod body 221, the end of the spring 231 abuts against the piston portion 222, and the guiding structure 240 is a guiding rod arranged in the receiving cavity 214, and the guiding rod is inserted into the hollow cavity 223 of the rod body 221.

[0044] Specifically, refer to Figure 4 and Figure 5 , the end of the rod body 221 is provided with a fixing groove 224 communicating with the hollow cavity 223, one end of the spring 231 abuts against the cavity wall of the receiving cavity 214, and the other end is arranged in the fixing groove 224; in this way, it can not only position the spring 231, making the spring 231 not easy to shake, but also control the elastic force and length of the spring 231 to a certain extent, reducing the size of the one-way valve 100.

[0045] Refer to Figure 4 and Figure 6, The receiving cavity 214 and the fixing groove 224 define an installation space for the spring 231. In order not to increase the size of the valve body 300 and enable the spring 231 to not only meet the limit of the valve core 220 but also be compressed under a preset pressure, the depth of the fixing groove 224 is h, and the distance from the bottom of the receiving cavity 214 to the bottom of the fixing groove 224 is H, satisfying 0.3 ≤ h / H ≤ 0.7. By making the size parameters of the fixing groove 224 and the receiving cavity 214 satisfy the proportional relationship, the elastic force and length of the spring 231 are ensured to meet the requirements.

[0046] Referring to Figure 1 , Further, in order to prevent the rotation of the valve core 220 and ensure that the valve core 220 moves linearly, a guiding structure 240 is provided on the rod wall of the rod body 221 and the cavity wall of the receiving cavity 214. The rod body 221 axially moves relative to the valve cover 210 through the guiding structure 240, and the guiding structure 240 can limit the circumferential rotation of the rod body relative to the valve cover 210.

[0047] Specifically, referring to Figure 3 and Figure 6 , the guiding structure 240 is a positioning protrusion 241 provided on the rod wall of the rod body 221 and a guiding groove 242 provided on the cavity wall of the receiving cavity 214 corresponding to the positioning protrusion 241. The guiding groove 242 extends along the axial direction of the receiving cavity 214, and the positioning protrusion 241 is movably arranged in the guiding groove 214. The side wall of the receiving cavity 214 is provided with a guiding groove 242 corresponding to the positioning protrusion 241. On the one hand, the rotation of the valve core 220 may cause the sealing ring on the valve core 220 to not be correctly aligned with the sealing surface of the valve body 300, thereby reducing the sealing performance and increasing the risk of leakage; or the rotation may cause the movement of the valve core 220 to become unstable, affecting the opening and closing accuracy of the valve and thus affecting the control effect of the system. On the other hand, incorrect rotational movement will increase the friction between the valve core 220 and the inner wall of the valve cover 210. The rotating valve core 220 may apply uneven forces to the valve cover 210 or other structural components, which may cause damage to the valve structure, may cause the valve core 220 to wear more severely, and reduce the service life of the valve.

[0048] Referring to Figure 6 , in an embodiment, in order to precisely control the position of the valve core 220, the bottom of the guiding groove 242 is higher than the bottom of the receiving cavity 214, so that the bottom of the guiding groove 242 forms a step 243. When the compression spring 231 is compressed, the positioning portion 242 can abut against the step 243; the step 243 provides a fixed stop point to ensure that the valve core 220 can be accurately aligned when in the closed position, thereby providing better sealing performance; in addition, the step 243 design can prevent the valve core 220 from over-compressing the spring 231 during the closing process and protect the spring 231 from damage; precisely controlling the position of the valve core 220 enables the valve core 220 to return to the same position every time it is closed, which is particularly important for valves that need to be frequently opened and closed.

[0049] Further, referring to Figure 4 , in the solution of providing the positioning protrusion 241, the positioning protrusion 241 and the guiding groove 242 are in clearance fit; specifically, the range of the clearance between the positioning protrusion 241 and the guiding groove 242 is 0.03 mm - 0.3 mm; referring to Figure 5 , in the solution of not providing the positioning protrusion 241, the rod body 221 and the accommodating cavity 214 are in clearance fit. Specifically, the range of the clearance between the valve rod 221 and the accommodating cavity 214 is 0.03 mm - 0.3 mm, such as 0.05 mm, 0.1 mm, 0.15 mm, etc. Limiting the clearance range between 0.03 mm and 0.3 mm, the existence of the clearance can provide certain elasticity, ensuring the movement flexibility and reliability of the valve core 220 while making the fit between the rod body 221 and the accommodating cavity 214 more stable. Too small a clearance will cause the rod body 221 to get stuck or be difficult to move, while too large a clearance may lead to an increase in the friction between the rod body 221 and the accommodating cavity 214, affecting the service life of the valve core assembly 200.

[0050] Referring to Figure 3 , further, in order to allow the rod body 221 of the valve core 220 to move smoothly within the valve cover 210 when the valve is opened, while reducing the contact area with the inner wall of the valve cover 210, thereby reducing friction and wear. In an embodiment, at least one cut surface 225 is provided on the outer peripheral surface of the rod body 221 along the axial direction; the provision of the cut surface 225 reduces the contact area between the rod body 221 of the valve core 220 and the inner wall of the valve cover 210 on the one hand, thereby reducing the frictional force during movement and making the movement of the valve core 220 smoother; on the other hand, when the rod body 221 moves relative to the valve cover 210, the compressed gas can be discharged, making the movement of the valve core 220 smoother. In other embodiments, it can also be provided separately on the cavity wall of the accommodating cavity 214 of the valve cover 210; or cut surfaces 225 are provided on both of them.

[0051] Referring to Figure 4 , in this embodiment, while providing the cut surface 225, the rod body 221 is also provided with an exhaust hole 226 communicating with the hollow cavity 223, so that the hollow cavity 223 communicates with the outside of the valve cover 210, making the movement of the valve core 220 smoother. In other embodiments, the exhaust hole 226 can also be provided alone or the cut surface 225 can be provided alone.

[0052] Specifically, in order to ensure smooth discharge of the fluid, the cut surface 225 extends from one end of the rod body 221 to the other end; or the cut surface 225 extends from the cavity opening of the accommodating cavity 214 to the cavity bottom of the accommodating cavity 214. Alternatively, the axial length of the cut surface 225 is greater than the movement stroke of the rod body 221 relative to the valve cover 210. In addition, limiting the length of the cut surface 225 can reduce the contact area between the valve core 220 and the inner wall of the valve cover 210, thereby reducing friction and wear during movement and extending the service life of the valve.

[0053] Specifically, two positioning protrusions 241 are provided, and the cut surface 225 is provided on the rod body 221 and is adjacent to the positioning protrusion 241 . The two positioning protrusions 241 move in two limiting grooves to prevent the valve core 220 from rotating in the circumferential direction.

[0054] Reference Figure 6 and Figure 7 In this embodiment, the valve cover 210 includes a cover section 211 for connecting to the valve body 300 and a cap head 212 provided above the cover section 211 for clamping. The circumferential side of the cover section 211 is also provided with an installation groove 213 for assembling a sealing member. The valve cover 210 is connected to the cover section 211 by threads, and sealing is achieved by squeezing a sealing ring.

[0055] The cover body section 211 is cylindrical, and the projected area of the cap head 212 in the plane is smaller than the cover body section 211. In this way, even if the cap head 212 is completely located in the accommodating cavity 214, there is still operating space, and the cap head 212 is provided with a groove near the cover body section 211 for easy holding or tool clamping. In addition, a polygonal cut edge can be provided on the outer side wall of the valve cover 210 for threaded fastening with the valve body 300.

[0056] Reference Figure 1 The valve body 300 is block-shaped, and the valve body 300 is provided with a first flow channel 320, a second flow channel 330 and a valve cavity 301 connecting the first flow channel 320 and the second flow channel 330. The valve cavity 301 has a valve port 310, and the valve port 310 is connected with the first flow channel 320 to form a valve port 310 channel. The piston portion 222 abuts against the valve port 310 to interrupt the first flow channel 320 and the second flow channel 330. The axes of the first flow channel 320 and the second flow channel 330 are parallel to each other. The valve cavity 301 is perpendicular to the first flow channel 320 and the second flow channel 330. The fluid enters the first flow channel 320 in a horizontal direction, enters the valve port 310 channel in a vertical direction, and then pushes open the valve core 220, and flows out from the second flow channel 330 in a horizontal direction. The horizontal direction and the vertical direction are only for the convenience of explaining the channel setting of the valve body 300, and do not limit the first flow channel 320 and the second flow channel 330 or the valve cavity 301 to be in a horizontal or vertical relationship.

[0057] Reference Figure 1 and Figure 2, the cross-section of the valve port 310 is a tapered shape that is wider at the top and narrower at the bottom. The piston part 222 is provided with a sealing groove 227 for assembling a sealing ring. The sealing groove 227 is arranged on the conical surface 228 of the piston part 222. The valve port 310 is arranged as a tapered port with a gradually decreasing diameter in the direction away from the piston part 222. The valve port 310 cooperates with the conical surface 228 of the plug body part. The piston part 222 is placed inside the tapered port of the valve port 310. In this embodiment, the sealing groove 227 is arranged on the circumferential side of the piston part 222. In other embodiments, the sealing groove 227 is arranged at the bottom of the piston part 222. The sealing ring of the piston part 222 abuts against the valve port 310 to ensure blocking during reverse flow and smooth opening during forward flow.

[0058] The above description is only an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A check valve, characterized in that, Comprising: A valve body, including a valve cavity having a valve port; and A valve core assembly, including a valve cover, an elastic member, and a valve core. The valve cover is connected to the valve body, and the valve cover is provided with a receiving cavity; the elastic member is disposed in the receiving cavity. The valve core includes a rod body and a piston portion provided at one end of the rod body. The valve core abuts against the elastic member; the piston portion can sealingly abut against the valve port under the elastic force of the elastic member.

2. The one-way valve according to claim 1, characterized in that, The rod body is provided with a hollow cavity, the elastic member is a spring, one end of the spring is disposed in the hollow cavity, and the other end abuts against the bottom of the receiving cavity.

3. The one-way valve according to claim 2, wherein, A fixing groove communicating with the hollow cavity is provided at the end of the rod body, and the other end of the spring is disposed in the fixing groove.

4. The one-way valve according to claim 1, characterized in that, The elastic member is a spring, the spring sleeves the rod body, one end of the spring abuts against the piston portion, and the other end abuts against the bottom of the receiving cavity.

5. The one-way valve according to claim 1, characterized in that, A guiding structure is provided on the rod wall of the rod body and the cavity wall of the receiving cavity. The guiding structure plays a guiding role when the rod body moves axially relative to the valve cover.

6. The one-way valve according to claim 5, wherein, The guiding structure is a positioning protrusion provided on the rod wall of the rod body and a guiding groove corresponding to the positioning protrusion provided on the cavity wall of the receiving cavity. The guiding groove extends along the axial direction of the receiving cavity, and the positioning protrusion is movably disposed in the guiding groove.

7. The one-way valve according to claim 1, wherein At least one cut surface is provided on the outer peripheral surface of the rod body in the axial direction and / or at least one cut surface is provided on the inner wall of the receiving cavity.

8. The one-way valve according to claim 7, characterized in that, The cut surface extends from one end of the rod body to the other end; or the cut surface extends from the cavity opening of the receiving cavity to the cavity bottom of the receiving cavity.

9. The one-way valve according to claim 7, wherein The length of the cut surface in the axial direction of the rod body is greater than the movement stroke of the rod body relative to the valve cover.

10. The one-way valve according to claim 2, characterized in that, The rod body is further provided with an exhaust hole communicating with the hollow cavity.

11. The one-way valve according to claim 1, characterized in that, The piston portion is provided with a sealing groove for assembling a sealing ring, and the piston portion and the cavity wall of the valve port squeeze the sealing ring to seal.

12. The one-way valve according to claim 1, wherein, The valve port is provided as a tapered port with a gradually decreasing diameter in the direction away from the piston portion. A tapered surface inclined in the direction away from the end of the rod body is provided on the circumferential direction of the piston portion, and the tapered surface cooperates with the cavity wall of the tapered port.

13. The one-way valve according to claim 1, characterized in that, The valve core is an injection molded part.

14. The one-way valve according to claim 1, characterized in that, The valve cover includes a cover body section connected to the valve body and a cap head provided above the cover body section for clamping. An installation groove for assembling a sealing member is further provided on the circumferential side of the cover body section, and the valve body and the cover body section squeeze the sealing member.

15. A valve island, characterized in that, Comprising a base and the check valve according to any one of claims 1 to 14; the valve body is configured as the base; or the valve body is installed on the base.

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