Valve element assembly and one-way valve

Abstract

The utility model discloses a valve element assembly and a one-way valve, and relates to the technical field of one-way valves, the valve element assembly comprises a valve cover, a valve element, an elastic piece and a limiting structure, the valve element assembly is used for the one-way valve, the valve cover is used for being connected with a valve body of the one-way valve, and the valve cover is provided with a containing cavity; the valve element comprises a rod body and a piston part arranged at one end of the rod body, the other end of the rod body is movably arranged in the containing cavity, and the piston part is used for being matched with the valve body to open / close a valve port of the valve body. The elastic piece is arranged between the rod body and the valve cover; the limiting structure is used for limiting the valve element to be separated from the valve deck under the elastic action of the elastic piece. According to the utility model, the valve core assembly is improved, and the valve core assembly and the valve body can be separately produced and sold through the arrangement of the limiting structure and are finally assembled; and the valve core is matched with the valve body, so that the caliber of the valve port is increased, and the size of the valve body is not changed, so that the 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 one-way valves, in particular to a valve core component and a one-way valve. Background Art

[0002] The basic structure of a one-way valve usually includes a valve body, a valve seat, a valve core, a spring and a seal. The valve seat is the part that the valve core contacts with to close the valve. The valve seat and the valve body are sealed by a seal. The valve core contacts the valve seat with the force of the spring to control the opening and closing of the valve, thereby preventing the backflow of the fluid. At present, in the scenario where a larger inner diameter of the process valve port is required, in order to ensure the sealing of the one-way valve, the overall size of the one-way valve becomes larger, but due to the limited external installation space, the overall installation size of the one-way valve is large, which makes installation inconvenient. Utility Model Content

[0003] The main purpose of the utility model is to propose a valve core assembly and a one-way valve. The valve core assembly is applied to the one-way valve to optimize the structure of the one-way valve. By eliminating the valve seat, the inner diameter of the valve port is increased while ensuring the performance of the one-way valve. Compared with the one-way valve with the same valve port inner diameter, the size of the valve body can be reduced, which is suitable for scenarios where space is limited and the valve port flow needs to be increased.

[0004] To achieve the above purpose, the valve core assembly proposed by the utility model includes:

[0005] A valve cover, used to be connected to the valve body of the one-way valve, the valve cover having an accommodating cavity;

[0006] The valve core comprises a rod body and a piston portion arranged at one end of the rod body, the other end of the rod body is movably arranged in the accommodating cavity, and the piston portion is used to cooperate with the valve body to open / close the valve port of the valve body;

[0007] an elastic member, the elastic member being disposed between the rod body and the valve cover; and

[0008] A limiting structure is used to limit the valve core from separating from the valve cover under the elastic force of the elastic member.

[0009] In one embodiment, the limiting structure includes a limiting portion provided on the valve cover and a positioning portion provided on the rod body, and the limiting portion can abut against the positioning portion to limit the valve core from separating from the valve cover under the elastic force of the elastic member.

[0010] In one embodiment, the positioning portion is a positioning protrusion protruding from the rod body.

[0011] In one embodiment, the limiting portion is a rivet provided at the periphery of the cavity opening of the accommodating cavity, and the rivet abuts against the positioning protrusion to limit the rod body from being separated from the valve cover.

[0012] In one embodiment, at least a portion of the rivet is bent toward the cavity opening of the accommodating cavity, and an angle α is formed between the bent portion and a center line of the cavity opening of the accommodating cavity, and 10°≤α≤90°.

[0013] In one embodiment, the length of the rivet (243) is d, 0.5mm≤d≤5mm; and / or the thickness of the rivet is s, 0.5mm≤s≤3mm.

[0014] In one embodiment, the maximum inner diameter of the rivet at the bend is c, and the outer diameter of the positioning protrusion is a, satisfying 0<ca≤3mm.

[0015] In one embodiment, the outer diameter of the positioning protrusion is a, and the outer diameter of the rod body is b, satisfying 0.4mm≤ab≤3mm.

[0016] In one embodiment, the rivet is made of metal material.

[0017] In one embodiment, the positioning portion is a positioning protrusion provided on the rod body or the entire rod body is the positioning portion; the limiting portion is a retaining spring provided at the cavity opening of the accommodating cavity, and the retaining spring abuts against the positioning portion to limit the rod body from detaching from the valve cover.

[0018] In one embodiment, a side wall of the accommodating cavity is provided with a guide groove corresponding to the positioning protrusion, and the positioning protrusion is movably disposed in the guide groove.

[0019] In one embodiment, the gap between the positioning protrusion and the guide groove is in the range of 0.03 mm-0.3 mm; and / or the gap between the rod body and the accommodating cavity is in the range of 0.03 mm-0.3 mm.

[0020] In one embodiment, the rod body is provided with a hollow cavity, the elastic member is a spring, one end of the spring is provided in the hollow cavity, and the other end abuts against the cavity bottom of the accommodating cavity.

[0021] In one embodiment, 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.

[0022] In one embodiment, the groove depth of the fixing groove is h, and the distance from the cavity bottom of the accommodating cavity to the groove bottom of the fixing groove is H, which satisfies 0.3≤h / H≤0.7.

[0023] In one embodiment, the outer peripheral surface of the rod body is provided with at least one cut surface along the axial direction and / or the inner wall of the accommodating cavity is provided with at least one cut surface.

[0024] In one embodiment, the section extends from one end of the rod body to the other end; or the section extends from the cavity opening of the accommodating cavity to the cavity bottom of the accommodating cavity.

[0025] In one embodiment, the axial length of the section is greater than the movement stroke of the rod relative to the valve cover.

[0026] In one embodiment, the rod body is further provided with an exhaust hole communicating with the hollow cavity.

[0027] In one embodiment, the piston portion is provided with a sealing groove for assembling a sealing ring.

[0028] In one embodiment, a conical surface inclined in a direction away from the end of the rod body is provided on the circumference of the piston portion, and the sealing groove is provided on the conical surface.

[0029] In one embodiment, the valve core is integrally formed by injection molding.

[0030] In one embodiment, the valve cover includes a cover section for connecting to the valve body and a cap head disposed above the cover section for clamping, and a mounting groove for assembling a sealing member is further disposed on the circumference of the cover section.

[0031] The utility model also proposes a one-way valve, including the valve core assembly and valve body as described above, the valve body having a valve cavity with a valve port, the valve body being provided with a first flow port and a second flow port connected to the valve cavity, the valve core assembly being arranged in the valve cavity, the valve cover being sealingly connected to the valve body, and the piston portion of the valve core sealingly abutting the valve port under the action of an elastic member.

[0032] The valve core assembly provided by the utility model prevents the valve stem from being separated from the valve cover through a limiting structure. The valve core assembly can be sold separately, and the valve core assembly is small in size. It can be assembled after being processed separately, which can improve production efficiency. The valve core cooperates with the valve body to achieve the interruption or connection of the inlet and outlet, and the intermediate part "valve seat" is cancelled. On the one hand, it can simplify the structure of the one-way valve, reduce the number of components, and thus reduce manufacturing costs and potential failure points; on the other hand, the valve core cooperates with the valve body to increase the diameter of the valve port without changing the size of the valve body, that is, the cancellation of the valve seat can further reduce the overall size of the one-way valve, which is convenient for product miniaturization, so that it can be used in scenarios 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

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0034] Figure 1 A schematic structural diagram of an embodiment of a one-way valve provided by the utility model;

[0035] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the middle valve core assembly;

[0036] Figure 3 for Figure 2 A schematic structural diagram of an embodiment of a middle valve core assembly;

[0037] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0038] Figure 5 for Figure 2 A schematic structural diagram of another embodiment of the middle valve core assembly;

[0039] Figure 6 for Figure 2 A schematic structural diagram of another embodiment of the valve core assembly;

[0040] Figure 7 for Figure 2 A schematic structural diagram of an embodiment of a middle valve core;

[0041] Figure 8 for Figure 1 A schematic structural diagram of an embodiment of a middle valve cover;

[0042] Fig. 9 for Figure 1 A structural schematic diagram of an embodiment of a middle valve core.

[0043] Description of Figure Numbers:

[0044] 100, one-way valve; 200, valve core assembly; 210, valve cover; 211, cover body section; 212, cap head; 213, mounting groove; 214, accommodating chamber; 220, valve core; 221, rod body; 222, piston part; 223, hollow cavity; 224, fixing groove; 225, cut surface; 226, exhaust hole; 227, sealing groove; 228, conical surface; 230, elastic member; 231, spring; 240, limiting structure; 241, limiting part; 242, positioning part; 243, rivet; 244, positioning protrusion; 245, retaining spring; 250, guide groove; 251, step; 300, valve body; 301, valve chamber; 310, valve port; 320, first flow channel opening; 330, second flow channel opening.

[0045] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0049] The basic structure of a one-way valve usually includes a valve body, a valve seat, a valve core, a spring and a seal. The valve seat is the part that the valve core contacts with to close the valve. The valve seat and the valve body are sealed by a seal. The valve core contacts the valve seat with the force of the spring to control the opening and closing of the valve, thereby preventing the backflow of the fluid. At present, in the scenario where a larger inner diameter of the process valve port is required, in order to ensure the sealing of the one-way valve, the overall size of the one-way valve becomes larger, but due to the limited external installation space, the overall installation size of the one-way valve is large, which makes installation inconvenient.

[0050] The utility model provides a one-way valve, which is used in situations where it is necessary to prevent the backflow of fluid in the system, including but not limited to refrigeration systems, water heating systems, air-conditioning systems installed in vehicles, transfer cases installed in cars, front / rear bridge positions, etc.

[0051] See also Figure 1 In one embodiment of the 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, the bottom of the valve body 300 is provided with a first flow channel opening 320 connected to the valve cavity 301, the side of the valve body 300 is provided with a second flow channel opening 330 connected to the valve cavity 301, the valve cover 210 is sealed and connected to the valve body 300, the valve core 220 is located in the valve cavity 301, and the piston portion 222 of the valve core 220 is sealed and abutted against the valve port 310 connected to the first flow channel opening 320 under the action of the elastic member 230.

[0052] During operation, the fluid (gas or liquid) pushes open the valve core 220 and flows from the first flow channel 320 to 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 the closed valve port 310 to interrupt the fluid.

[0053] Reference Figures 2 to 6 Specifically, the valve core assembly 200 includes a valve cover 210, a valve core 220, an elastic member 230 and a limiting structure 240. The valve cover 210 is used to be connected to the valve body 300 of the one-way valve 100, and the valve cover 210 has a receiving chamber 214; the valve core 220 includes a rod body 221 and a piston portion 222 arranged at one end of the rod body 221, and the other end of the rod body 221 is movably arranged in the receiving chamber 214, and the piston portion 222 is used to cooperate with the valve body 300 to open / close the valve port 310 of the valve body 300; the elastic member 230 is arranged between the rod body 221 and the valve cover 210; the limiting structure 240 is used to limit the valve core 220 from being separated from the valve cover 210 under the elastic force of the elastic member 230.

[0054] The utility model makes improvements to the valve core assembly 200. The setting of the limiting structure 240 allows the valve core assembly 200 and the valve body 300 to be separated for separate production and sale, and finally assembled; and the valve core 220 cooperates with the valve body 300 to increase the diameter of the valve port 310 without changing the size of the valve body 300, so that it can be used in scenarios where space is limited and a large-diameter valve port 310 is required.

[0055] The valve core assembly 200 provided by the utility model prevents the valve stem from being separated from the valve cover 210 through the limiting structure 240. The valve core assembly 200 can be sold separately, and the valve core assembly 200 is small in size and can be assembled after being processed separately, which can improve production efficiency; the valve core 220 cooperates with the valve body 300 to achieve the interruption or connection of the inlet and outlet, and the intermediate part "valve seat" is cancelled. On the one hand, it can simplify the structure of the one-way valve 100, reduce the number of components, thereby reducing manufacturing costs and potential failure points; on the other hand, the cancellation of the valve seat can further reduce the overall size of the one-way valve 100, facilitate product miniaturization, and be suitable for installation in places 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.

[0056] The overall structure of the one-way valve 100 is described above. The following describes how the limiting structure 240 limits the valve core 220 from separating from the valve cover 210 under the elastic force of the elastic member 230 .

[0057] Reference Figures 2 to 6 Specifically, the limiting structure 240 includes a limiting portion 241 provided on the valve cover 210 and a positioning portion 242 provided on the rod body 221. Under the action of external force, the piston portion 222 approaches the valve cover 210 axially and compresses the elastic member 230; when the external force disappears, the limiting portion 241 and the positioning portion 242 abut against each other to limit the valve core 220 from separating from the valve cover 210 under the elastic force of the elastic member 230.

[0058] Reference Figure 3 In one embodiment, the positioning portion 242 is a protrusion protruding from the valve body 300, and the limiting portion 241 is a rivet 243 provided at the periphery of the cavity opening of the accommodating cavity 214. After the rivet 243 is folded, it limits the rod body 221 from being separated from the valve cover 210 by abutting against the protrusion; or after the rivet 243 is deformed, it limits the rod body 221 from being separated from the valve cover 210 by abutting against the protrusion.

[0059] Reference Figure 4 In this embodiment, at least a portion of the rivet 243 is bent toward the cavity opening of the accommodating cavity 214 , and the rivet 243 is bent toward the accommodating cavity 214 during assembly, thereby reducing the cavity opening of the accommodating cavity 214 so that the rivet 243 can abut against the positioning protrusion 244 .

[0060] Specifically, the angle between the bent portion of the rivet 243 and the center line of the cavity opening of the accommodating cavity 214 is α, 10°≤α≤90°, referring to Figure 3 and Figure 4 In the figure, the rivet 243 is partially bent, and in other embodiments, the rivet 243 is bent as a whole; when measuring the angle α, the bent portion is an arc curve with multiple tangents, and the middle position of the bent portion is taken as the reference line, or the straight portion of the bent portion close to the end is taken as the reference line; the center line of the cavity opening of the accommodating cavity 214 can take the unbent portion of the rivet 243 as a reference.

[0061] Because for components with an angle less than 10° (the rod 221 and the valve cover 210 may detach) and components with an angle greater than 90° (the valve cover 210 and the rod 221 or the valve cover 210 and the valve body 300 may interfere), limiting α can ensure that the rivet 243 abuts against the positioning protrusion 244 and has a certain strength and is not easily deformed; it can also reduce the difficulty of the machining process and improve production efficiency, that is, it can be roughly judged that 10°, 20°, 25°, 40°, 65°, 80°, and 90° all meet the production requirements.

[0062] In addition, refer to Figure 8 The length of the rivet 243 is d, 0.5mm≤d≤5mm, and the length of the rivet 243 is limited to 0.5mm to 5mm. Similarly, the thickness of the rivet 243 is limited to 0.2mm to 3mm. In this way, the rivet 243 has a certain strength and does not interfere with other parts. In summary, the length and thickness of the rivet 243 are limited to ensure that the rivet 243 can meet specific design requirements during the manufacturing and assembly process, and can achieve the expected performance standards during use.

[0063] Reference Figure 8 and Fig. 9 In order to facilitate the assembly of the valve core 220 and the valve cover 210, the maximum inner diameter of the rivet 243 at the bend is c, and the outer diameter of the positioning protrusion 244 is a, satisfying 0<ca≤3mm. The maximum inner diameter c of the rivet 243 at the bend is the maximum inner diameter of the rivet 243 before it is bent, and the difference between c and a can be 0.2mm, 0.5mm, 1mm, 2mm, etc., for easy assembly.

[0064] Reference Fig. 9 In order to ensure that the valve core 220 can achieve the expected motion trajectory and performance during operation, the outer diameter of the positioning protrusion 244 is a, and the outer diameter of the rod body 221 is b, which satisfies 0.4mm≤ab≤3mm. The positioning protrusion 244 and the rod body 221 meet the above parameter ranges, such as 0.4mm, 0.8mm, 1.4mm, 2.4mm, etc., which helps to achieve higher precision control in the manufacturing process and ensure the matching quality between the valve core and the valve cover.

[0065] The rivet 243 is made of metal material. For example, the rivet 243 and the valve cover 210 are integrally formed by insert injection molding; or the rivet 243 and the valve cover 210 are made of metal as a whole, such as by sheet metal stamping or other processes.

[0066] Reference Figure 5 In one embodiment, the positioning portion 242 is a positioning protrusion 244 protruding from the valve body 300 , and the limiting portion 241 is a retaining spring 245 provided at the cavity opening of the accommodating cavity 214 . The retaining spring 245 abuts against the positioning protrusion 244 to limit the rod body 221 from separating from the valve cover 210 .

[0067] Reference Figure 6 In one embodiment, the positioning portion 242 is the rod body 221 itself, the limiting portion 241 is a retaining spring 245 arranged at the cavity opening of the accommodating cavity 214, the valve body 300 is provided with a retaining spring 245 groove, the retaining spring 245 is arranged in the retaining spring 245 groove, and the retaining spring 245 is arranged on the inner side of the valve cover 210.

[0068] In other embodiments, the limiting structure 240 is a cavity wall of the accommodating cavity 214 with a gradually decreasing inner diameter and a rod body 221 that is gradually reduced from top to bottom; that is, the cavity opening of the accommodating cavity 214 is reduced by pressing, and the inner diameter of the accommodating cavity 214 of the valve cover 210 along the cavity opening direction is gradually reduced, or the inner diameter of the cavity opening is smaller than the inner diameter of other positions, so that the valve core 220 cannot be separated from the valve cover 210; or, the rod body 221 is V-shaped and divided into two sections, and the two sections of the rod body 221 can be close together and placed in the accommodating cavity 214, and after opening, they are limited by the cavity opening of the accommodating cavity 214; on this basis, a positioning portion 242 can be provided on the rod body 221; on the basis of the positioning portion 242, a positioning groove can be provided on the cavity wall of the accommodating cavity 214, and during the axial movement of the rod body 221, especially after the two sections of the rod body 221 are close together, the positioning portion 242 or the positioning portion 242 and the positioning groove are used to prevent the rod body 221 from being separated.

[0069] Reference Figure 3 or Figure 5Furthermore, in order to avoid the rotation of the valve core 220 and ensure that the valve core 220 moves in a straight line, the side wall of the accommodating chamber 214 is provided with a guide groove 250 corresponding to the positioning protrusion 244. On the one hand, the rotation of the valve core 220 may cause the sealing ring on the valve core 220 to be unable to align correctly 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, thereby 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 force 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, and reduce the service life of the valve.

[0070] Reference Figure 3 In order to accurately control the position of the valve core 220, the bottom of the guide groove 250 is higher than the bottom of the accommodating cavity 214 so that a step 251 is formed at the bottom of the guide groove 250. When the spring 231 is compressed, the positioning portion 242 can abut against the step 251; the step 251 provides a fixed stop point to ensure that the valve core 220 can be accurately aligned in the closed position, thereby providing better sealing performance; in addition, the step 251 design can prevent the valve core 220 from over-compressing the spring 231 during the closing process, thereby protecting the spring 231 from damage; the position of the valve core 220 is accurately controlled so that the valve core 220 can return to the same position each time it is closed, which is particularly important for valves that need to be frequently opened and closed.

[0071] Further, in the scheme where the positioning protrusion 244 is provided, the positioning protrusion 244 and the guide groove 250 are clearance-matched; specifically, the range of the clearance between the positioning protrusion 244 and the guide groove 250 is 0.03mm-0.3mm; in the scheme where the positioning protrusion 244 is not provided, the rod body 221 and the accommodating cavity 214 are clearance-matched, specifically, the range of the clearance between the valve stem 221 and the accommodating cavity 214 is 0.03mm-0.3mm, such as 0.05mm, 0.1mm, 0.15mm, etc., and the clearance range is limited to between 0.03mm and 0.3mm. The existence of the clearance can provide a certain elasticity, ensure the flexibility and reliability of the movement of the valve core 220, and make the cooperation between the rod body 221 and the accommodating cavity 214 more stable. Too small a clearance can cause the rod body 221 to get stuck or difficult to move, while too large a clearance can cause the friction between the rod body 221 and the accommodating cavity 214 to increase, affecting the life of the valve core assembly 200.

[0072] Reference Figures 3 to 7Furthermore, the rod body 221 is provided with a hollow cavity 223, and the elastic member 230 is a spring 231, one end of the spring 231 is provided in the hollow cavity 223, and the other end abuts against the bottom of the accommodating cavity 214. The elastic member 230 is arranged between the accommodating cavity 214 and the hollow cavity 223 of the valve core 220, which 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 integrally formed by injection molding, and the rod body 221 of the valve core 220 provided with the hollow cavity 223 can reduce the cost and material consumption of the valve core 220 on the one hand, and can control the mold flow during the injection molding process on the other hand, so that the cavity wall thickness of the hollow cavity 223 is uniform, thereby making the finished product of the valve core 220 high in consistency and good in stability, thereby reducing the collision resistance between the valve core 220 and the valve cover 210 during movement.

[0073] Specifically, the end of the rod body 221 is provided with a fixing groove 224 connected to the hollow cavity 223, one end of the spring 231 abuts against the cavity wall of the accommodating cavity 214, and the other end is arranged in the fixing groove 224; this can not only position the spring 231 so that the spring 231 is not easy to shake, but also control the elastic force and length of the spring 231 to a certain extent, thereby reducing the size of the one-way valve 100.

[0074] Reference Figure 3 The accommodating cavity 214 and the fixed groove 224 define the installation space of the spring 231. In order not to increase the size of the valve body 300 and to ensure that the spring 231 can both limit the valve core 220 and be compressed under a preset pressure, the groove depth of the fixed groove 224 is h, and the distance from the cavity bottom of the accommodating cavity 214 to the groove bottom of the fixed groove 224 is H, satisfying 0.3≤h / H≤0.7. By making the size parameters of the fixed groove 224 and the accommodating cavity 214 meet the proportional relationship, it is ensured that the elastic force and length of the spring 231 meet the requirements.

[0075] Reference Figure 7 Furthermore, in order to allow the valve core 220 rod 221 to move smoothly in 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 one embodiment, the outer peripheral surface of the rod 221 is provided with at least one cut surface 225 along the axial direction; the provision of the cut surface 225 reduces the contact area between the valve core 220 rod 221 and the inner wall of the valve cover 210, thereby reducing the friction during the movement, making the movement of the valve core 220 smoother; on the other hand, the squeezed gas can be discharged during the movement of the rod 221 relative to the valve cover 210, 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 the cut surface 225 is provided on both.

[0076] Reference Figure 3In this embodiment, while the cut surface 225 is provided, the rod body 221 is also provided with an exhaust hole 226 communicating with the hollow cavity 223, so that the hollow cavity 223 is communicated with the outside of the valve cover 210, so that the movement of the valve core 220 is smoother. Figure 6 In other embodiments, only the exhaust hole 226 or only the cut surface 225 may be provided.

[0077] 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.

[0078] Specifically, two positioning protrusions 244 are provided, and the cut surface 225 is provided on the rod body 221 and is adjacent to the positioning protrusion 244. The two positioning protrusions 244 move in the two limiting grooves to prevent the circumferential rotation of the valve core 220; the rivet 243 is provided around the cavity opening of the accommodating cavity 214, and the rivet 243 is provided in a continuous ring shape; of course, the rivet 243 can also be provided intermittently, such as providing multiple rivets at intervals, or, when it is a flanging, symmetrically provided in two halves, etc.

[0079] The relationship between the valve core 220, the valve cover 210 and the limiting structure 240 in the valve core assembly 200 is introduced above, and the structure of the valve body 300 and the valve cover 210 is described below.

[0080] Reference Figure 1 and Figure 2 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.

[0081] 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.

[0082] Reference Figure 1The valve body 300 is block-shaped, and the valve body 300 is provided with a first flow channel opening 320, a second flow channel opening 330, and a valve cavity 301 communicating with the first flow channel opening 320 and the second flow channel opening 330. The valve cavity 301 has a valve port 310, and the valve port 310 is communicated with the first flow channel opening 320 to form a valve port 310 channel. The piston portion 222 abuts against the valve port 310 to interrupt the first flow channel opening 320 and the second flow channel opening 330. The axes are parallel to each other, and the valve cavity 301 is perpendicular to the first flow channel opening 320 and the second flow channel opening 330. The fluid enters the first flow channel opening 320 in a horizontal direction, enters the valve port 310 channel in a vertical direction, pushes open the valve core 220, and flows out from the second flow channel opening 330 in a horizontal direction. The horizontal and vertical directions are only for the convenience of explaining the channel setting of the valve body 300, and do not limit the first flow channel opening 320 and the second flow channel opening 330 or the valve cavity 301 to be in a horizontal or vertical relationship.

[0083] The cross-section of the valve port 310 is a cone that is wide at the top and narrow at the bottom. The piston portion 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 portion 222. The valve port 310 cooperates with the conical surface 228 of the plug body. The plug body is placed in the conical hole of the valve port 310. The sealing ring of the piston portion 222 abuts against the valve port 310 to ensure that it is blocked in reverse flow and can be opened smoothly in downstream flow.

[0084] The manufacturing steps of the valve core assembly 200 are as follows: select the valve cover 210, the valve core 220 and the spring 231; machine the valve core 220 and the spring 231, and the machining includes cutting, grinding, polishing and other steps to ensure dimensional accuracy and surface quality; assemble the valve core 220, the spring 231 and the valve cover 210, and install the limiting structure 240 to limit the separation of the valve core 220 and the valve cover 210 in the direction of movement; if necessary, seals (such as O-rings, sealing gaskets) can also be installed.

[0085] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A valve core assembly for a one-way valve, characterized in that: The valve core assembly comprises: A valve cover, used to be connected to the valve body of the one-way valve, the valve cover having an accommodating cavity; The valve core comprises a rod body and a piston portion arranged at one end of the rod body, the other end of the rod body is movably arranged in the accommodating cavity, and the piston portion is used to cooperate with the valve body to open / close the valve port of the valve body; an elastic member, the elastic member being disposed between the rod body and the valve cover; and A limiting structure is used to limit the valve core from separating from the valve cover under the elastic force of the elastic member.

2. The valve core assembly according to claim 1, characterized in that: The limiting structure includes a limiting portion provided on the valve cover and a positioning portion provided on the rod body, and the limiting portion can abut against the positioning portion to limit the valve core from separating from the valve cover under the elastic force of the elastic member.

3. The valve core assembly according to claim 2, characterized in that: The positioning portion is a positioning protrusion protruding from the rod body.

4. The valve core assembly according to claim 3, characterized in that: The limiting portion is a rivet member disposed at the periphery of the cavity opening of the accommodating cavity, and the rivet member abuts against the positioning protrusion to limit the rod body from being separated from the valve cover.

5. The valve core assembly according to claim 4, characterized in that: At least a portion of the rivet is bent toward the cavity opening of the accommodating cavity, and an angle α is formed between the bent portion and a center line of the cavity opening of the accommodating cavity, and 10°≤α≤90°.

6. The valve core assembly according to claim 4, characterized in that: The length of the rivet is d, 0.5 mm ≤ d ≤ 5 mm; and / or the thickness of the rivet is s, 0.2 mm ≤ s ≤ 3 mm.

7. The valve core assembly according to claim 4, characterized in that: The maximum inner diameter of the rivet at the bending part is c, and the outer diameter of the positioning protrusion is a, which satisfies 0<ca≤3mm.

8. The valve core assembly according to claim 3, characterized in that: The outer diameter of the positioning protrusion is a, and the outer diameter of the rod body is b, which satisfies 0.4mm≤ab≤3mm.

9. The valve core assembly according to claim 4, characterized in that: The riveted piece is made of metal material.

10. The valve core assembly according to claim 2, characterized in that: The positioning portion is a positioning protrusion provided on the rod body or the entire rod body is the positioning portion; the limiting portion is a retaining spring provided at the cavity opening of the accommodating cavity, and the retaining spring abuts against the positioning portion to limit the rod body from being separated from the valve cover.

11. The valve core assembly according to claim 3, characterized in that: The side wall of the accommodating cavity is provided with a guide groove corresponding to the positioning protrusion, and the positioning protrusion is movably arranged in the guide groove.

12. The valve core assembly according to claim 11, characterized in that: The gap between the positioning protrusion and the guide groove is in the range of 0.03 mm-0.3 mm; and / or the gap between the rod body and the accommodating cavity is in the range of 0.03 mm-0.3 mm.

13. The valve core assembly according to claim 11, characterized in that: 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 cavity bottom of the accommodating cavity.

14. The valve core assembly according to claim 13, characterized in that: 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.

15. The valve core assembly according to claim 14, characterized in that: The groove depth of the fixing groove is h, and the distance from the cavity bottom of the accommodating cavity to the groove bottom of the fixing groove is H, which satisfies 0.3≤h / H≤0.

7.

16. The valve core assembly according to claim 13, characterized in that: The outer peripheral surface of the rod body is provided with at least one cut surface in the axial direction and / or the inner wall of the accommodating cavity is provided with at least one cut surface.

17. The valve core assembly according to claim 16, characterized in that: The section extends from one end of the rod body to the other end; or the section extends from the cavity opening of the accommodating cavity to the cavity bottom of the accommodating cavity.

18. The valve core assembly according to claim 16, characterized in that: The axial length of the section is greater than the movement stroke of the rod body relative to the valve cover.

19. The valve core assembly according to claim 13, characterized in that: The rod body is also provided with an exhaust hole communicating with the hollow cavity.

20. The valve core assembly according to claim 1, characterized in that: The piston portion is provided with a sealing groove for assembling a sealing ring.

21. The valve core assembly according to claim 1, characterized in that: A conical surface is provided on the circumference of the piston portion and is inclined in a direction away from the end of the rod body.

22. The valve core assembly according to claim 1, characterized in that The valve core is integrally formed by injection molding.

23. The valve core assembly according to claim 1, characterized in that The valve cover comprises a cover body section for connecting with the valve body and a cap head arranged above the cover body section for clamping. The peripheral side of the cover body section is also provided with an installation groove for assembling a sealing member.

24. A one-way valve, characterized in that: include: The valve core assembly according to any one of claims 1 to 23; and A valve body, wherein the valve body has a valve cavity with a valve port, the valve body is provided with a first flow channel port and a second flow channel port connected to the valve cavity, the valve core assembly is arranged in the valve cavity, the valve cover is sealed and connected to the valve body, and the piston portion of the valve core is sealed against the valve port under the action of an elastic member.

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