Check valve

Abstract

The present application provides a check valve. The check valve comprises: a valve tube, having a first tube section and a second tube section; a valve seat, arranged between the first tube section and the second tube section, the valve seat being located at the joint of the first tube section and the second tube section, the valve seat being provided with a valve port, and the first tube section and the second tube section being communicated through the valve port; and a valve core, movably arranged in the first tube section or the second tube section, wherein the valve core is arranged opposite to the valve port, and the valve core can adjust the flow at the valve port. The technical solution provided by the present application can solve the problem in the prior art of the joint of a valve seat and a valve tube assembly being prone to internal leakage.

Description

One-way valve

[0001] This application claims priority to the patent application filed with the State Intellectual Property Office of China on August 16, 2023, with application number 2023222088531 and application name “One-way valve”, and the patent application filed with the State Intellectual Property Office of China on August 16, 2023, with application number 2023222256217 and application name “One-way valve”. Technical Field

[0002] The present application relates to the technical field of valve assemblies, and in particular to a one-way valve. Background Art

[0003] Currently, in order to control the flow direction of fluid in air-conditioning systems, a one-way valve is often used as a non-return component and is arranged in the piping system.

[0004] One-way valves in related art typically include a valve tube, a valve core, and a valve seat. The valve core and valve seat are disposed within the valve tube. The valve core moves to block or open the valve port on the valve seat to achieve one-way flow of fluid. However, to secure the valve seat within the valve tube, the valve seat is typically first press-fitted into the valve tube with an interference fit. A groove is then cut into the outer wall of the valve tube, allowing the groove to mate with a fixed groove on the side wall of the valve seat to secure the valve seat within the valve tube. This arrangement reduces the thickness of the valve tube at the grooved structure, making it more susceptible to breakage. Furthermore, there is a risk of internal leakage at the point where the groove mates with the side wall of the valve seat.

[0005] Application Contents

[0006] The present application provides a one-way valve to solve the problem of internal leakage easily occurring at the connection between the valve seat and the valve pipe in the related art.

[0007] The present application provides a one-way valve, which includes: a valve pipe, having a first pipe section and a second pipe section; a valve seat, arranged between the first pipe section and the second pipe section, and the valve seat is located at the connection between the first pipe section and the second pipe section, the valve seat has a valve port, and the first pipe section and the second pipe section are connected through the valve port; a valve core, movably arranged in the first pipe section or the second pipe section, the valve core is arranged relative to the valve port, and the valve core can adjust the flow at the valve port.

[0008] Furthermore, the first pipe section has a first communication port and a first port disposed opposite each other, the second pipe section has a second communication port and a second port disposed opposite each other, one end of the valve seat is welded to the first port, and the other end of the valve seat is welded to the second port. This arrangement effectively prevents breakage at the connection between the valve pipe and the valve seat.

[0009] Furthermore, a limiting structure is provided between the valve seat and the first pipe section and the second pipe section.

[0010] Furthermore, a limiting structure is provided between the valve seat and the first pipe section or the second pipe section. This arrangement can prevent the valve seat from being displaced relative to the first pipe section or the second pipe section during welding, thereby facilitating welding of the valve seat and improving work efficiency.

[0011] Furthermore, the valve seat has a first end face and a second end face disposed opposite each other, with a first boss disposed on the first end face and a second boss disposed on the second end face, the periphery of the first boss abutting the inner wall of the first pipe section, and / or a second boss disposed on the second end face, the periphery of the second boss abutting the inner wall of the second pipe section. This arrangement prevents displacement of the valve seat during welding, improving welding efficiency, and also enhances the radial stability of the valve seat fixed within the valve pipe, reducing the impact of fluid disturbances within the one-way valve on the valve seat.

[0012] Furthermore, the valve seat is press-fitted into the valve tube, and the valve seat and the valve tube are fixed by welding.

[0013] Furthermore, the first pipe section has a first connecting end, the second pipe section has a second connecting end, the valve seat is fixed to the first pipe section by welding, and the end surface of the first connecting end is fixed to the end surface of the second connecting end by welding.

[0014] Furthermore, the valve core is movably arranged in the first pipe section.

[0015] Furthermore, a fixing groove is provided in an annular shape on the inner wall of the second pipe section. The fixing groove is located at the second connecting end, and the valve seat is fixed in the fixing groove.

[0016] Furthermore, the first pipe segment includes a connected straight segment and a transition segment. The end of the straight segment, distal to the transition segment, is connected to the second pipe segment. The flow area of ​​the transition segment gradually decreases away from the valve port. The valve core is movably disposed within the straight segment. This arrangement reduces the pressure drop of fluid when it enters the system pipeline through the straight segment, thereby ensuring efficient fluid transportation.

[0017] Furthermore, the valve core has an abutting end and a sealing end disposed opposite each other. The sealing end is disposed toward the valve port and cooperates with the valve port to regulate flow at the valve port. The outer diameter of the abutting end is larger than the minimum inner diameter of the transition section, and the abutting end can cooperate with the inner wall of the transition section to limit the displacement of the valve core. This arrangement can limit the relative displacement of the valve core and ensure the cooperation between the valve core, the valve seat, and the valve pipe.

[0018] Furthermore, the outer wall of the abutting end has a mating surface, the distance between the mating surface and the axial line of the valve core gradually decreases in the direction away from the valve port, and the mating surface and the inner wall of the transition section are engaged and limited. Through the above arrangement, the mating surface can abut against the transition section, preventing the valve core from getting stuck.

[0019] Furthermore, the valve core has a connecting portion, one end of which is connected to the abutting end, and the other end of which is connected to the sealing end. The diameter of the connecting portion is larger than the diameter of the abutting end, and when the abutting end abuts the transition section, there is an axial gap between the connecting portion and the transition section. This arrangement prevents the outermost edge of the connecting portion from abutting the connection between the straight section and the transition section, preventing the connecting portion from becoming stuck near the outer end of the transition section, thereby improving the stability of the one-way valve.

[0020] Furthermore, the valve core includes a main body and a plurality of support protrusions, the plurality of support protrusions being arranged on the outer side wall of the main body at annular intervals along the circumference of the main body. The support protrusions extend axially along the main body, and the support protrusions have a connecting end and a free end that are oppositely arranged. The free end is located on the side of the main body away from the valve port and protrudes from the end of the main body. The free end forms an abutting end, and the end of the main body close to the valve port forms a sealing end. The connecting end is located in the middle of the main body. The plurality of support protrusions cooperate with the inner wall of the valve tube to guide the valve core, and a flow channel is formed between two adjacent support protrusions. Through the above arrangement, the support protrusions can guide the movement of the valve core in the valve tube, thereby improving the stability of the movement of the valve core in the valve tube.

[0021] Furthermore, the inner diameter of the end of the valve port close to the valve core gradually increases in the direction close to the valve core. Through the above arrangement, the sealing area between the sealing section and the valve port can be increased, preventing fluid from leaking from the valve port when the valve core blocks the valve port. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0023] FIG1 shows a schematic structural diagram of a one-way valve provided by one or more embodiments of the present application;

[0024] FIG2 shows an exploded view of the structure of a one-way valve provided by one or more embodiments of the present application;

[0025] FIG3 shows a schematic structural diagram of a one-way valve provided by one or more embodiments of the present application;

[0026] FIG4 shows an exploded view of the structure of a one-way valve provided by one or more embodiments of the present application.

[0027] Among them, the above drawings include the following figure marks: 10, valve tube; 11, first pipe section; 111, transition section; 112, straight section; 12, second pipe section; 20, valve seat; 21, valve port; 30, valve core; 31, main body; 32, support protrusion; 33, abutment end; 34, sealing end. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] As shown in Figures 1 and 2, an embodiment of the present application provides a one-way valve, which includes: a valve tube 10, a valve seat 20, and a valve core 30. The valve tube 10 has a first tube section 11 and a second tube section 12. The valve seat 20 is disposed between the first tube section 11 and the second tube section 12, and is located at the connection between the first tube section 11 and the second tube section 12. The valve seat 20 has a valve port 21, and the first tube section 11 and the second tube section 12 are connected through the valve port 21. The valve core 30 is movably disposed within the first tube section 11 or the second tube section 12, and is disposed relative to the valve port 21. The valve core 30 can adjust the flow rate at the valve port 21. During use of the one-way valve, the pressure of the fluid can push the valve core 30 to move relative to the valve seat 20 within the valve tube 10 to open or close the valve port 21, thereby adjusting the flow rate of the fluid at the valve port 21.

[0030] According to the technical solution provided in the present application, the valve seat 20 is arranged between the first pipe section 11 and the second pipe section 12, and the valve seat 20 is located at the connection between the first pipe section 11 and the second pipe section 12, which can improve the connection performance between the valve pipe 10 and the valve seat 20 and ensure the structural stability of the valve pipe 10. Compared with the traditional technical solution, the valve seat 20 is fixed by notching the outer wall of the valve pipe 10. In the present application, the valve seat 20 is arranged between the first pipe section 11 and the second pipe section 12, which can avoid the risk of easy breakage at the notch in the related technology. At the same time, such a setting method can also prevent the fluid from leaking from the gap between the valve seat 20 and the valve pipe 10, thereby improving the sealing and reliability of the one-way valve.

[0031] In one embodiment of the present application, the first pipe section 11 has a first connecting port and a first port arranged opposite to each other, the second pipe section 12 has a second connecting port and a second port arranged opposite to each other, one end of the valve seat 20 is welded to the first port, and the other end of the valve seat 20 is welded to the second port. Through the above arrangement, the valve seat 20 is welded to the first port and the second port, respectively, and the valve seat 20 is fixed between the first pipe section 11 and the second pipe section 12, which can effectively prevent the valve pipe 10 and the valve seat 20 from breaking at the connection. Specifically, the welding method between the valve seat 20 and the valve pipe 10 is laser welding, which can reduce heat while reducing deformation of the valve pipe 10 caused by heat conduction or high temperature environment heat, further reducing the possibility of fluid leakage caused by a gap between the valve seat 20 and the valve pipe 10, and improving the sealing performance of the one-way valve.

[0032] In this application, the valve tube 10 and valve seat 20 can be made of stainless steel. Compared to conventional solutions, which require grooves on the exterior of the valve tube 10 and require the use of a copper alloy with better processability, this increases the manufacturing cost of the one-way valve. In this application, the valve tube 10 and valve seat 20 are made of a lower-cost stainless steel material, thereby reducing manufacturing costs.

[0033] Specifically, a limiting structure can be set between the valve seat 20 and the first pipe section 11. By setting the limiting structure, the relative position of the valve seat 20 and the first pipe section 11 can be limited. By limiting the position of the valve seat 20, the welding of the valve seat 20 can be facilitated and work efficiency can be improved.

[0034] Specifically, a limiting structure can also be set between the valve seat 20 and the second pipe section 12. By setting the limiting structure, when the valve seat 20 is connected to the second pipe section 12, the limiting structure can enhance the limiting effect of the valve seat 20 on the second pipe section 12, thereby preventing the second pipe section 12 from shaking relative to the valve seat 20 during use, thereby improving the connection performance between the valve seat 20 and the second pipe section 12.

[0035] It is understandable that a limiting structure may be provided between the valve seat 20 and the first pipe section 11, and between the valve seat 20 and the second pipe section 12. By providing the limiting structure, the valve seat 20 can be conveniently positioned with respect to the first pipe section 11 and the second pipe section 12 during the welding process, preventing the valve seat 20 from being displaced relative to the first pipe section 11 or the second pipe section 12 during the welding process, thereby facilitating welding of the valve seat 20 and improving work efficiency. Furthermore, the limiting structure can enhance the limiting effect of the valve seat 20 on the first pipe section 11 and the second pipe section 12, preventing the valve seat 20 from shaking due to fluid disturbances during use, and improving the connection performance of the valve seat 20 with the first pipe section 11 and the second pipe section 12.

[0036] As shown in Figure 1, the valve seat 20 has a first end face and a second end face that are arranged opposite each other. The first end face is provided with a first boss, and the second end face is provided with a second boss. The periphery of the first boss abuts the inner wall of the first pipe segment 11, and the periphery of the second boss abuts the inner wall of the second pipe segment 12. Through this arrangement, during welding, the valve seat 20 can be positioned relative to the first pipe segment 11 via the first boss, and the valve seat 20 can be positioned relative to the second pipe segment 12 via the second boss. This prevents displacement of the valve seat 20 relative to the first and second pipe segments 11, 12 during welding, thereby improving welding efficiency. Furthermore, during operation of the one-way valve, the provision of the first and second bosses enhances the radial stability of the valve seat 20 fixed within the valve tube 10, preventing fluid disturbances within the one-way valve from loosening the valve seat 20 and improving the connection performance between the valve seat 20 and the first and second pipe segments 11, 12. Of course, in some other specific embodiments, the structure of the valve seat 20 may be different from the above, for example, the valve seat 20 may only have a first boss on the first end face and a plane on the second end face, or the valve seat 20 may only have a second boss on the second end face and a plane on the first end face. Those skilled in the art may choose the setting according to actual needs.

[0037] In other embodiments of the present application, the outer peripheral surfaces of the first boss and the second boss can also be set as inclined surfaces, and chamfers matching the inclined surfaces can be set on the inner walls of the first port and the inner walls of the second port. This can also play a role in limiting the valve core 30, and at the same time can increase the contact area between the valve core 30 and the valve tube 10, further preventing fluid leakage.

[0038] In another embodiment provided by the present application, unlike the solution in which one end of the valve seat 20 is welded to the first port and the other end of the valve seat 20 is welded to the second port, as shown in Figures 3 and 4, in this embodiment, the valve seat 20 is press-fitted into the valve tube 10 and welded to the valve tube 10. By first press-fitting the valve seat 20 into the valve tube 10 and fixing it to the valve tube 10 by welding, and then lathing the valve seat 20 to form the valve port 21, due to the large volume of the valve tube 10, this arrangement enables the clamp to conveniently and stably clamp the valve tube 10, thereby preventing the valve seat 20 from shaking during the lathing process and improving the machining accuracy of the valve port 21. Compared to the traditional technical solution in which the valve port 21 is first lathed and then the valve seat 20 is fixed to the valve tube 10, the one-way valve provided by the present application can facilitate clamping with a clamp and improve the machining accuracy of the valve seat 20, thereby ensuring the sealing performance of the one-way valve.

[0039] Specifically, the valve seat 20 and the valve tube 10 can be interference-fitted, meaning the valve seat 20 is first interference-fitted into the valve tube 10, and then the two are securely fixed by welding. The valve tube 10, with the valve seat 20 fixed thereto, is clamped in a machining fixture, and the valve seat 20 is then lathe-machined to form the valve port 21. This facilitates machining of the valve port 21 and improves machining accuracy.

[0040] Specifically, the welding method between the valve seat 20 and the valve tube 10 is furnace welding or brazing, which can prevent cracks from occurring at the weld while ensuring the integrity of the weld, further reducing the possibility of fluid leakage caused by a gap between the valve seat 20 and the valve tube 10, and improving the sealing performance of the one-way valve.

[0041] Furthermore, the first pipe section 11 has a first connecting end, the second pipe section 12 has a second connecting end, the valve seat 20 is welded to the second pipe section 12, and the end face of the first connecting end is welded to the end face of the second connecting end. Through the above arrangement, the first pipe section 11 and the second pipe section 12 can be directly contact-welded, such as by laser welding, without the need to weld the valve seat 20 to the second pipe section 12 and then weld the valve seat 20 to the first pipe section 11. This effectively reduces the risk of leakage at the weld of the valve pipe 10 and improves the stability and sealing of the one-way valve. In this embodiment, the valve seat 20 can be completely located within the second pipe section 12, and the end face of the valve seat 20 facing the first pipe section 11 is aligned with the end face of the first connecting end. At this time, the end face of the first connecting end is welded to the end face of the second connecting end. Through the above arrangement, the positioning of the valve seat 20 relative to the second pipe section 12 during the welding process can be facilitated.

[0042] Correspondingly, the valve core 30 is movably disposed within the first pipe section 11. By disposing the valve core 30 within the first pipe section 11, the pressure of the fluid can push the valve core 30 to move relative to the valve seat 20 within the first pipe section 11, thereby opening or closing the valve port 21, thereby adjusting the flow of fluid at the valve port 21. This arrangement facilitates the machining of the valve port 21. During the machining process, the valve seat 20 is first welded and fixed, and then the valve seat 20 is turned to form the valve port 21. This allows for easy observation of the turning progress of the valve port 21 and timely adjustments to ensure the machining accuracy of the valve port 21.

[0043] It is understood that the valve seat 20 can also be located partially within the first pipe section 11 and partially within the second pipe section 12. In this case, the end surface of the first connecting end is welded to the end surface of the second connecting end. With this arrangement, the valve seat 20 can limit the second pipe section 12, preventing misalignment when the first and second pipe sections 11, 12 are connected, thereby improving the connection performance between the valve seat 20, the first pipe section 11, and the second pipe section 12.

[0044] Specifically, a retaining groove can be annularly provided on the inner wall of the second pipe section 12. The retaining groove is located at the second connecting end and is an annular groove within which the valve seat 20 is secured. This arrangement allows the retaining groove to limit the position of the valve seat 20. When the fluid flows from the valve core 30 to the valve port 21, the retaining groove prevents displacement of the valve seat 20 due to the impact of the valve core 30 when the fluid pressure is excessive, thereby ensuring the stability of the one-way valve. Furthermore, the retaining groove also serves as a limiter during the installation of the valve seat 20, facilitating its positioning.

[0045] Furthermore, the first pipe section 11 includes a straight section 112 and a transition section 111, which are interconnected. The end of the straight section 112, which is away from the transition section 111, is connected to the second pipe section 12. The flow area of ​​the transition section 111 gradually decreases as it moves away from the valve port 21. The valve core 30 is movably disposed within the straight section 112. When the one-way valve is connected to the system pipeline, the diameter of the one-way valve tube 10 is set to be larger than the diameter of the system pipeline to ensure efficient fluid transportation through the one-way valve. In this application, the provision of the transition section 111 can reduce the pressure drop of the fluid when it enters the system pipeline through the straight section 112, thereby ensuring efficient fluid transportation.

[0046] In the present application, the valve core 30 has an abutting end 33 and a sealing end 34 that are arranged opposite to each other. The sealing end 34 is arranged toward the valve port 21 and cooperates with the valve port 21 to regulate the flow at the valve port 21. The outer diameter of the abutting end 33 is larger than the minimum inner diameter of the transition section 111. The abutting end 33 can cooperate with the inner wall of the transition section 111 to limit the displacement of the valve core 30. Specifically, when the flow direction of the fluid is from the valve port 21 through the valve core 30, the valve core 30 is lifted by the pressure of the fluid, the sealing section of the valve core 30 is separated from the port, the abutting end 33 of the valve core 30 abuts against the transition section 111, and the fluid can flow through the valve port 21. When the flow direction of the fluid is from the valve core 30 through the valve port 21, the valve core 30 moves toward the valve port 21 under the pressure of the fluid, the sealing section of the valve core 30 blocks the valve port 21, and the fluid is blocked at the valve seat 20. By providing the valve core 30 and the transition section 111 , the relative displacement of the valve core 30 can be limited, thereby ensuring the matching relationship between the valve core 30 , the valve seat 20 and the valve pipe 10 .

[0047] Furthermore, the outer wall of the abutting end 33 has a mating surface, and the axial distance between the mating surface and the valve core 30 gradually decreases in the direction away from the valve port 21, and the mating surface is limited by the inner wall of the transition section 111. In the present application, in order to reduce the overall weight of the valve core 30, the valve core 30 is processed using a plastic material. By providing a mating surface at the abutting end 33, when the abutting end 33 of the valve core 30 abuts the transition section 111, the mating surface abuts the inner wall of the transition section 111, preventing the structural corner of the abutting end 33 from deforming under the impact of the fluid, resulting in a reduction in the movement clearance between the valve core 30 and the valve tube 10, and preventing the valve core 30 from getting stuck.

[0048] Specifically, the valve core 30 has a connecting portion, one end of which is connected to the abutting end 33, and the other end of which is connected to the sealing end 34. The diameter of the connecting portion is larger than the diameter of the abutting end 33. When the abutting end 33 abuts the transition section 111, there is an axial gap between the connecting portion and the transition section 111. Through the above arrangement, when fluid flows from the valve port 21 to the valve core 30, the abutting end 33 of the valve core 30 abuts the transition section 111 under the impact of the fluid. The axial gap between the connecting portion and the transition section 111 can prevent the outermost edge of the connecting portion from abutting the connection between the straight section 112 and the transition section 111, preventing the outer end of the connecting portion close to the transition section 111 from getting stuck with the transition section 111, thereby improving the stability of the one-way valve.

[0049] Furthermore, the valve core 30 includes a main body 31 and a plurality of support protrusions 32. The plurality of support protrusions 32 are annularly spaced along the circumference of the main body 31 and are arranged on the outer wall of the main body 31. The support protrusions 32 extend axially along the main body 31 and have a connecting end and a free end oppositely disposed. The free end is located on the side of the main body 31 away from the valve port 21 and protrudes from the end of the main body 31. The free end forms an abutment end 33. The end of the main body 31 near the valve port 21 forms a sealing end 34. The connecting end is located in the middle of the main body 31. The plurality of support protrusions 32 cooperate with the inner wall of the valve tube 10 to guide the valve core 30, and a flow channel is formed between adjacent support protrusions 32. With this arrangement, when the fluid flows from the valve port 21 to the valve core 30, the fluid can flow to the system pipeline through the flow channel formed between the two adjacent protrusions. The support protrusions 32 also guide the movement of the valve core 30 within the valve tube 10, improving the stability of the movement of the valve core 30 within the valve tube 10. Specifically, the number of the supporting protrusions 32 can be set to 3 or more.

[0050] Specifically in the present application, the portion of the main body 31 excluding the sealing end 34 and the portion of the supporting protrusion 32 excluding the abutting end 33 together form a connecting portion.

[0051] In the present application, the inner diameter of the end of the valve port 21 near the valve core 30 gradually increases in the direction closer to the valve core 30. This configuration can increase the sealing area between the sealing end 34 and the valve port 21, preventing fluid leakage from the valve port 21 when the valve core 30 blocks the valve port 21. It can also increase the force-bearing area of ​​the valve seat 20 at the valve port 21, preventing the valve core 30 from causing deformation of the valve port 21 under the impact of high-pressure fluid. Specifically, an arc-shaped structure or a chamfered structure can be provided at the end of the valve port 21 near the valve core 30, and a corresponding arc-shaped structure or chamfered structure can be provided on the end surface of the sealing end 34.

[0052] The one-way valve provided in this application has the following advantages over the one-way valve in conventional technology:

[0053] 1. In this application, by arranging the valve seat 20 between the first pipe section 11 and the second pipe section 12, the risk of fracture at the groove in the related art can be avoided, thereby improving the overall stability of the one-way valve;

[0054] 2. In the present application, by providing a limiting structure on the valve seat 20, the positioning of the welding work can be facilitated, and the stability of the valve seat 20 relative to the first pipe section 11 and the second pipe section 12 can be improved;

[0055] 3. In the present application, an abutment end is provided on the valve core 30, and the diameter of the connecting portion of the valve core 30 is provided to be larger than the diameter of the abutment end, so that the outermost edge of the connecting portion does not abut against the connection between the straight section and the transition section, thereby preventing the connecting portion from being stuck with the transition section near the outer end of the transition section, thereby improving the stability of the one-way valve.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0058] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0061] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A one-way valve, characterized in that: The one-way valve comprises: A valve pipe (10) comprising a first pipe section (11) and a second pipe section (12); a valve seat (20) arranged between the first pipe section (11) and the second pipe section (12), and the valve seat (20) is located at the connection between the first pipe section (11) and the second pipe section (12), the valve seat (20) having a valve port (21), and the first pipe section (11) and the second pipe section (12) are connected through the valve port (21); A valve core (30) is movably arranged in the first pipe section (11) or the second pipe section (12); the valve core (30) is arranged relative to the valve port (21); and the valve core (30) can adjust the flow at the valve port (21).

2. The one-way valve according to claim 1, characterized in that: The first pipe section (11) has a first connecting port and a first port arranged opposite to each other, the second pipe section (12) has a second connecting port and a second port arranged opposite to each other, one end of the valve seat (20) is welded to the first port, and the other end of the valve seat (20) is welded to the second port.

3. The one-way valve according to claim 2, characterized in that: A limiting structure is provided between the valve seat (20) and the first pipe section (11) and the second pipe section (12).

4. The one-way valve according to claim 2, characterized in that: A limiting structure is provided between the valve seat (20) and the first pipe section (11) or the second pipe section (12).

5. The one-way valve according to claim 3, characterized in that: The valve seat (20) has a first end face and a second end face that are arranged opposite to each other, wherein the first end face is provided with a first boss, the periphery of which abuts against the inner wall of the first pipe section (11), and / or the second end face is provided with a second boss, the periphery of which abuts against the inner wall of the second pipe section (12).

6. The one-way valve according to claim 1, characterized in that: The valve seat (20) is pressed into the valve tube (10), and the valve seat (20) and the valve tube (10) are fixed by welding.

7. The one-way valve according to claim 6, characterized in that: The first pipe section (11) has a first connecting end, the second pipe section (12) has a second connecting end, the valve seat (20) is fixed to the first pipe section (11) by welding, and the end surface of the first connecting end is fixed to the end surface of the second connecting end by welding.

8. The one-way valve according to claim 7, characterized in that: The valve core (30) is movably arranged in the first pipe section (11).

9. The one-way valve according to claim 7, characterized in that: The inner wall of the second pipe section (12) is provided with a fixing groove in an annular manner. The fixing groove is located at the second connecting end, and the valve seat (20) is fixed in the fixing groove.

10. The one-way valve according to claim 1, characterized in that: The first pipe section (11) comprises a straight section (112) and a transition section (111) which are connected to each other; an end of the straight section (112) away from the transition section (111) is connected to the second pipe section (12); a flow area of ​​the transition section (111) gradually decreases in a direction away from the valve port (21); and the valve core (30) is movably arranged in the straight section (112).

11. The one-way valve according to claim 10, characterized in that: The valve core (30) has an abutment end (33) and a sealing end (34) which are arranged opposite to each other. The sealing end (34) is arranged toward the valve port (21) and cooperates with the valve port (21) to adjust the flow rate at the valve port (21). The outer diameter of the abutment end (33) is larger than the minimum inner diameter of the transition section (111). The abutment end (33) can cooperate with the inner wall of the transition section (111) to limit the displacement of the valve core (30).

12. The one-way valve according to claim 11, characterized in that: The outer side wall of the abutting end (33) has a matching surface, the axial distance between the matching surface and the valve core (30) gradually decreases in the direction away from the valve port (21), and the matching surface is limited by the inner wall of the transition section (111).

13. The one-way valve according to claim 12, characterized in that: The valve core (30) has a connecting portion, one end of which is connected to the abutting end (33), and the other end of which is connected to the sealing end (34). The diameter of the connecting portion is larger than the diameter of the abutting end (33). When the abutting end (33) abuts against the transition section (111), the connecting portion and the transition section (111) are spaced apart in the axial direction.

14. The one-way valve according to claim 11, characterized in that: The valve core (30) comprises a main body (31) and a plurality of supporting protrusions (32). The plurality of supporting protrusions (32) are arranged on the outer wall of the main body (31) at annular intervals along the circumference of the main body (31). The supporting protrusions (32) extend along the axial direction of the main body (31). The supporting protrusions (32) have a connecting end and a free end which are arranged opposite to each other. The free end is located on a side of the main body (31) away from the valve port (21) and is arranged to protrude from the end of the main body (31). The free end forms the abutting end (33). An end of the main body (31) close to the valve port (21) forms the sealing end (34). The connecting end is located in the middle of the main body (31). The plurality of supporting protrusions (32) cooperate with the inner wall of the valve tube (10) to guide the valve core (30). A flow channel is formed between two adjacent supporting protrusions (32).

15. The one-way valve according to claim 1, characterized in that: The inner radial direction of one end of the valve port (21) close to the valve core (30) gradually increases in a direction close to the valve core (30).

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