Valve core and one-way valve

Abstract

a valve core (3) and a one-way valve comprising: a main body (31) and a plurality of vanes (32), the main body (31) has at least one variable diameter portion (314) on a side surface thereof, the vanes (32) protrude from the side surface of the main body (31) and are spaced apart in a circumferential direction of the main body (31), a flow path (61, 62, 63) is formed between every two adjacent vanes (32), at least one of the flow paths (61, 62, 63) has a variable diameter portion (314) so ​​that a flow area of ​​the flow path corresponding to the variable diameter portion (314) is not equal to a flow area of ​​at least one of the remaining flow paths, an outer wall surface of the variable diameter portion (314) and an imaginary plane (7) form a line segment (71), radial distances H between each point on the line segment (71) and an axis L of the main body (31) are all unequal, and the imaginary plane (7) is perpendicular to the axis of the main body (31). As the fluid passes through the valve core (3), the forces that the valve core (3) receives along its radial direction vary in magnitude, and the resultant force along the radial direction of the valve core (3) is not zero. This resultant radial force causes the valve core (3) to abut against the inner wall surface of the chamber of the valve disc, thereby preventing the valve core (3) from colliding with the valve disc and generating noise.

Description

[Technical field]

[0001] Related Applications This disclosure claims priority to a Chinese patent application filed on April 2, 2022, bearing application number 202220783608.6 and entitled "Valve Core and One-Way Valve," the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of valve structures, and in particular to valve cores and one-way valves. [Background technology]

[0003] One-way valves are widely applied in refrigeration systems, for example in parallel with capillary tubes in air conditioning systems, to control the forward and reverse flow of refrigerant so that the refrigerant flows according to a defined direction.

[0004] In the prior art, a float type one-way valve has been proposed, which includes a valve body and a valve core mounted inside the valve body, and the valve core includes a body and a number of vanes protruding from the body. However, in the prior art, after the valve body is mounted in the air conditioning pipeline, due to the vibration of the pipeline and the structure of the valve body itself, the valve core will swing back and forth or vibrate inside the valve body, colliding with the inner wall of the valve body and generating noise. Summary of the Invention

[0005] SUMMARY OF THE DISCLOSURE The embodiments of the present disclosure provide a valve core and a one-way valve to improve the problem in the prior art of the valve core colliding with the valve body and generating noise.

[0006] The valve core of the one-way valve of the embodiment of the present disclosure includes a body and a plurality of vanes, the body has at least one variable diameter section on a side thereof, the vanes are protruded from the side of the body and are spaced apart along the circumferential direction of the body, a flow path is formed between every two adjacent vanes, at least one of the flow paths has a variable diameter section such that the flow area of ​​the flow path corresponding to this variable diameter section is not equal to the flow area of ​​at least one of the remaining flow paths, the outer wall surface of the variable diameter section and an imaginary plane form a line segment, the radial distances between each point on the line segment and the axis of the body are all unequal, and the imaginary plane is perpendicular to the axis of the body.

[0007] The one-way valve of the embodiment of the present disclosure includes a valve body and the above-mentioned valve core, and the valve core is disposed within the valve body.

[0008] An embodiment of the above disclosure has at least the following advantages or beneficial effects. In the valve core of the embodiment of the present disclosure, the diameter changing section is provided between two adjacent vanes, and the body is provided with the diameter changing section so that the flow area of ​​the flow passage corresponding to this diameter changing section is not equal to the flow area of ​​at least one of the remaining flow passages. As a result, the flow passage with a large flow area receives a large fluid pressure and the flow passage with a small flow area receives a small fluid pressure. As a result, the force that the valve core receives along its radial direction differs in magnitude during the process of the fluid passing through the valve core, and the radial resultant force along the radial direction of the valve core is no longer zero. Due to this radial resultant force, the valve core abuts against the inner wall surface of the chamber of the valve body, thereby preventing the valve core from colliding with the valve body and generating noise. [Brief description of the drawings]

[0009] [Figure 1] 1 shows a schematic diagram of a one-way valve according to an embodiment of the present disclosure. [Diagram 2] 2 shows a cross-sectional view taken along line AA in FIG. [Diagram 3] 1 shows an exploded schematic view of a one-way valve according to an embodiment of the present disclosure. [Figure 4] FIG. 2 shows a schematic diagram of one view of a valve core according to an embodiment of the present disclosure. [Diagram 5]1 shows a schematic diagram of a valve core according to an embodiment of the present disclosure from another perspective. [Figure 6] FIG. 2 shows a schematic diagram of a valve core according to another embodiment of the present disclosure. [Figure 7] 1 is a schematic diagram showing a line segment formed by cutting a diameter-changing portion on an imaginary plane.

[0010] Here, the symbols in the drawings are explained as follows. 1 First connecting pipe 2 Valve body 21 Valve Orifice 3 Valve core 31 Main unit 311 Equal diameter segments 312 First variable diameter segment 313 Second variable diameter segment 314 Variable diameter section 315 Protrusion 32 Wing plate 331 First straight line segment 332 Second straight line segment 333 First arc line segment 334 Second arc line segment 4 End cover 5 Second connecting pipe 61 First Channel 62 Second Stream 63 Third Stream 7 Virtual Plane 71 Line Segments α1 1st included angle α2 2nd included angle α3 3rd included angle DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Now, with reference to the drawings, the exemplary embodiments will be described more fully. However, the exemplary embodiments can be implemented in various forms, and should not be understood to be limited to the embodiments described herein. On the contrary, by providing these embodiments, the present disclosure will be fully complete and the idea of ​​the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the drawings indicate the same or similar configurations, and therefore detailed descriptions thereof will be omitted.

[0012] As shown in FIG. 1 to FIG. 3, FIG. 1 shows a schematic diagram of a one-way valve according to an embodiment of the present disclosure. FIG. 2 shows a cross-sectional view of AA in FIG. 1. FIG. 3 shows an exploded schematic diagram of a one-way valve according to an embodiment of the present disclosure. The one-way valve according to an embodiment of the present disclosure includes a first connecting pipe 1, a valve body 2, a valve core 3, an end cover 4, and a second connecting pipe 5. The first connecting pipe 1 is connected to one end of the valve body 2, and the first connecting pipe 1 is used to connect a fluid inlet pipe. The end cover 4 is connected to the other end of the valve body 2. The second connecting pipe 5 is connected to the end cover 4, and the second connecting pipe 5 is used to connect a fluid outlet pipe. The valve core 3 is provided in the chamber of the valve body 2 and is used to seal or open the valve port 21 formed inside the valve body 2.

[0013] It will be understood that the terms "comprising" and "having" in the embodiments of the present disclosure, and any variations thereof, are intended to include a non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may further include steps or units that are not listed, or may further include other steps or assemblies inherent to the process, method, product, or apparatus.

[0014] As an example, the fluid enters the valve body 2 from the first connecting pipe 1, and the pressure of the fluid itself drives the valve core 3 in the valve body 2 to move toward the second connecting pipe 5, thereby opening the valve port 21 of the valve body 2, and the fluid passes through the valve body 2 to reach the second connecting pipe 5. When the flow of the fluid toward the second connecting pipe 5 stops, the valve core 3 can return to a position to continue sealing the valve port 21 by its own gravity or by receiving a driving force toward the valve port. For example, in some examples, the one-way valve is placed vertically, that is, after the one-way valve in FIG. 2 is rotated 90 degrees counterclockwise, the first connecting pipe 1 is located at the bottom surface of the valve body, and the second connecting pipe 5 is located at the top surface of the valve body, and when the fluid stops being continuously injected into the first connecting pipe 1, that is, when the flow of the fluid toward the second connecting pipe 5 stops, in this case, the valve core 3 moves downward under the action of its own gravity to seal the valve port 21, and the one-way valve is closed.

[0015] It can be seen that the valve core 3 moves back and forth along the axis of the valve body 2, thereby realizing the opening and closing of the valve port 21 and further realizing the function of one-way conduction.

[0016] It should be understood that the structures and materials of the first connecting pipe 1, the valve body 2, the end cover 4 and the second connecting pipe 5 do not constitute a substantial limitation on the technical aspects of the valve core 3 provided by the present application, and well-established products in the prior art may be used, but the description will be omitted here.

[0017] As shown in Figures 4 and 5, Figure 4 shows a schematic diagram of the valve core 3 of the embodiment of the present disclosure from one viewpoint. Figure 5 shows a schematic diagram of the valve core 3 of the embodiment of the present disclosure from another viewpoint. The valve core 3 of the embodiment of the present disclosure includes a main body 31 and a plurality of vanes 32. There is at least one diameter-changing portion 314 on the side of the main body 31. The plurality of vanes 32 protrude from the side of the main body 31 and are spaced apart along the circumferential direction of the main body 31, and a flow path (61, 62, 63) is formed between every two adjacent vanes 32. Here, the diameter-changing portion 314 is provided between two adjacent vanes 32 so that the flow area of ​​the flow path corresponding to this diameter-changing portion 314 is not equal to the flow area of ​​at least one of the remaining flow paths.

[0018] In this embodiment, the diameter-changing section 314 is provided between two adjacent vanes 32. By providing the diameter-changing section 314 on the main body 31, the flow area of ​​the flow passage corresponding to the diameter-changing section 314 is not equal to the flow area of ​​at least one of the other flow passages. Therefore, the flow passage with a larger flow area receives a larger fluid pressure, and the flow passage with a smaller flow area receives a smaller fluid pressure. As a result, in the process of the fluid passing through the valve core 3, the forces received by the valve core 3 along its radial direction are different in magnitude, so that the forces received by the valve core 3 along its radial direction are not balanced, that is, the radial resultant force received by the valve core 3 is not zero. Under the action of this radial resultant force, the valve core 3 is offset in the valve body toward the direction of this radial resultant force, that is, the radial resultant force causes the valve core 3 to abut against the inner wall surface of the chamber of the valve disc 2. As a result, when the valve core moves along the axial direction of the valve disc within the valve disc, one side of the valve core 3 continues to adhere to the inner wall of the valve disc, thereby preventing the valve core 3 from colliding with the valve disc 2 and generating noise.

[0019] It should be explained that in the prior art, the body of the valve core is generally a body of revolution with a regular shape, for example, a cylindrical shape. A plurality of vanes are provided protruding from the outer wall of the body, and are provided at uniform intervals along the circumferential direction of the body. Thus, the flow area of ​​the flow passage formed between each two adjacent vanes is basically consistent. After the fluid flows through the valve core, the force of the valve core in the radial direction is basically balanced. In addition, since the valve core needs to move back and forth along the axis of the valve body within the valve body, there must be a gap between the vanes and the inner wall surface of the chamber of the valve body. When the valve body is installed in the air conditioning pipeline and vibration occurs in the air conditioning pipeline, due to the existence of the gap, the valve core will sway or swing back and forth relative to the valve body inside the valve body, and even collide with the valve body, generating noise.

[0020] In the embodiment of the present disclosure, by providing a diameter-changing section 314 in the main body 31 of the valve core 3, this diameter-changing section 314 makes the main body 31 have an irregular shape with the same radial cross section corresponding to the portion where the diameter-changing section 314 is provided, and further, when multiple vanes 32 are provided on the side of the main body 31, the flow areas of the multiple flow paths formed between each two adjacent vanes 32 are made to differ in size, and finally, the valve core 3 is made to abut against the inner wall of the valve body 2, thereby preventing it from shaking.

[0021] In one embodiment, transition 314 is configured as a cutting surface.

[0022] By configuring the diameter-changing portion 314 as a cut surface, the distance between the region where the cut surface of the main body 31 is located and the axis of the main body 31 is reduced, and furthermore, the flow area of ​​the flow path corresponding to this cut surface is increased. Since the flow area of ​​the flow path corresponding to this cut surface is larger than the flow area of ​​other flow paths where the cut surface of the main body 31 is not located, ultimately, when the fluid passes through the valve core 3, the force that the valve core 3 receives in the radial direction becomes unbalanced.

[0023] It will be appreciated that the cutting surface may be formed by being integrally formed with the body 31 and the vanes 32, for example by molding. It goes without saying that the body 31 having a regular shape may be formed first, and then the body 31 may be cut by milling to form the cutting surface.

[0024] In one embodiment, the cut surface may be proximate one end of the body 31 , which end is adjacent the valve orifice 21 of the valve disc 2 .

[0025] The cut surface may or may not be parallel to the axis of the main body 31. When the cut surface and the axis of the main body 31 are not parallel, the cut surface and the axis of the main body 31 may gradually approach each other or gradually move apart along the fluid flow direction.

[0026] The body 31 includes a constant diameter segment 311, a first changing diameter segment 312, and a second changing diameter segment 313. The first changing diameter segment 312 is connected to one end of the constant diameter segment 311, and is used to sealingly engage with the valve orifice 21 of the valve body 2. When the one-way valve is conducted, the first changing diameter segment 312 is disengaged from the valve orifice 21 of the valve body 2. When the one-way valve is closed, the first changing diameter segment 312 seals the valve orifice 21 of the valve body 2. The second changing diameter segment 313 is connected to the other end of the constant diameter segment 311.

[0027] Equal diameter segment 311 can be understood as a plurality of cross sections formed by cutting equal diameter segment 311 in a direction perpendicular to the axis of main body 31, all of which have the same cross-sectional area. First varying diameter segment 312 and second varying diameter segment 313 can be understood as a plurality of cross sections formed by cutting first varying diameter segment 312 in a direction perpendicular to the axis of main body 31, each of which has different cross-sectional areas, and a plurality of cross sections formed by cutting second varying diameter segment 313 in a direction perpendicular to the axis of main body 31.

[0028] Illustratively, first changing diameter segment 312 extends from one end of constant diameter segment 311 in a direction away from second changing diameter segment 313, with first changing diameter segment 312 gradually decreasing in cross-sectional area. Second changing diameter segment 313 extends from the other end of constant diameter segment 311 in a direction away from first changing diameter segment 312, with second changing diameter segment 313 gradually decreasing in cross-sectional area.

[0029] The cut surface and a side surface of the constant diameter segment 311 respectively form a first straight line segment 331 and a second straight line segment 332. The cut surface and a side surface of the first varying diameter segment 312 form a first arc line segment 333. The cut surface and a side surface of the second varying diameter segment 313 form a second arc line segment 334. The first arc line segment 333, the first straight line segment 331, the second arc line segment 334, and the second straight line segment 332 are connected end-to-end in order to form a closed curve.

[0030] It can be appreciated that the constant diameter segment 311 may be formed by cutting a cylinder, and the first varying diameter segment 312 and the second varying diameter segment 313 may be formed by cutting a truncated cone.

[0031] In one embodiment, the taper of the truncated cone of the first varying diameter segment 312 and the taper of the truncated cone of the second varying diameter segment 313 may be the same or different. It may be understood that taper refers to the ratio of the difference between the diameters of the two base circles above and below the truncated cone to the height of the truncated cone.

[0032] The vane 32 is connected to the constant diameter segment 311 and the second changing diameter segment 313 , and one end of the vane 32 protrudes from the end face of the second changing diameter segment 313 remote from the constant diameter segment 311 .

[0033] 5, an included angle is formed between every two adjacent vanes 32 along the circumferential direction of the main body 31, and each included angle is equal. Specifically, a first included angle α1, a second included angle α2, and a third included angle α3 are formed between adjacent vanes 32, and the first included angle α1, the second included angle α2, and the third included angle α3 are approximately equal to each other.

[0034] Since the first included angle α1, the second included angle α2, and the third included angle α3 are approximately equal to each other, it can be understood that the flow areas of the flow paths must be equal if the body 31 does not have the variable diameter section 314. In the embodiment of the present disclosure, based on the equality of the included angles, the flow area of ​​the flow path corresponding to the variable diameter section 314 can be directly changed by providing the variable diameter section 314.

[0035] The number of vanes 32 may be multiple, for example, two or three or more.

[0036] In this embodiment, the number of vanes 32 is three, and the three vanes 32 are evenly arranged along the circumferential direction of the body 31, that is, the first included angle α1, the second included angle α2, and the third included angle α3 are equal to each other. The flow passage corresponding to the first included angle α1 is the first flow passage 61, the flow passage corresponding to the second included angle α2 is the second flow passage 62, and the flow passage corresponding to the third included angle α3 is the third flow passage 63.

[0037] The number of diameter-changing portions 314 is two, and the two diameter-changing portions 314 are provided corresponding to two adjacent flow paths, respectively. For example, one diameter-changing portion 314 is provided corresponding to the second flow path 62, and the other diameter-changing portion 314 is provided corresponding to the third flow path 63.

[0038] The number of diameter-changing portions 314 is three, and it goes without saying that the three diameter-changing portions 314 may be provided corresponding to the first flow path 61, the second flow path 62, and the third flow path 63, respectively. Since it is necessary to ensure that the flow areas of the three flow paths are different, it is necessary to ensure that the distances between the outer walls of the three diameter-changing portions 314 and the axis of the main body 31 are different. For example, when the diameter-changing portion 314 is configured as a cut surface, the distance between one cut surface and the axis of the main body 31 is different from that of at least one of the other cut surfaces, so that it is possible to ensure that the flow areas of at least two of the three flow paths are different.

[0039] In another embodiment, the number of diameter change sections 314 may be one, and the flow area of ​​the flow passage corresponding to the diameter change section 314 may be different from the flow area of ​​the other adjacent flow passages.

[0040] In other embodiments, the first included angle α1, the second included angle α2, and the third included angle α3 may not be equal to each other. For example, the distance between two adjacent vanes 32 corresponding to the diameter change portion 314 may be designed to be large, and the distance between two vanes 32 not provided with the diameter change portion 314 may be designed to be small.

[0041] For example, the first included angle α1 is smaller than the second included angle α2, which makes the flow area of ​​the second flow passage 62 much larger than the flow area of ​​the first flow passage 61, and further increases the magnitude of the resultant radial force received by the valve core 3, so as to ensure that the valve core 3 can stably abut against the chamber wall of the valve body 2.

[0042] As shown in Fig. 6, Fig. 6 shows a schematic diagram of a valve core 3 of another embodiment of the present disclosure. The valve core 3 of this embodiment differs from the valve core 3 of the above embodiment in that the variable diameter part 314 is configured as a protrusion 315, and the description of the common points is omitted.

[0043] Specifically, by configuring the variable diameter portion 314 as a protrusion 315, the distance between the outer wall of the protrusion 315 and the axis of the main body 31 becomes larger than that at other positions on the main body 31, and further, the flow area of ​​the flow passage corresponding to this protrusion 315 becomes smaller, and finally, the flow areas of the multiple flows become different, allowing the valve core 3 to abut against the chamber wall of the valve body 2.

[0044] In one embodiment, the first included angle α1, the second included angle α2, and the third included angle α3 may be equal to each other. When the three included angles are equal, the flow area of ​​the flow path corresponding to the position where the protrusion 315 is provided is smaller than the flow area of ​​the other flow paths. In this embodiment, the flow area of ​​the second flow path 62 is smaller than the flow area of ​​the first flow path 61, and the flow area of ​​the second flow path 62 is smaller than the flow area of ​​the third flow path 63.

[0045] It is needless to say that the first included angle α1, the second included angle α2, and the third included angle α3 do not have to be equal to each other. For example, the second included angle α2 is smaller than the first included angle α1, and the second included angle α2 is smaller than the third included angle α3. Because the second included angle α2 of the second passage 62 is the smallest and the second passage 62 is further provided with the protrusion 315, the flow area of ​​the second passage 62 is much smaller than the first passage 61 or the second passage 62, and the magnitude of the radial resultant force received by the valve core 3 is increased, so that the valve core 3 can be stably abutted against the chamber wall of the valve body 2.

[0046] Furthermore, when two or more diameter-changing portions 314 are provided on the main body 31, some of the diameter-changing portions 314 may be cut surfaces, and some of the diameter-changing portions 314 may be protrusions 315.

[0047] In this embodiment, as shown in FIG. 6, the second flow passage 62 corresponds to the protrusion 315, the third flow passage 63 corresponds to the cut surface, and the first flow passage 61 is not provided with the diameter-changing portion 314.

[0048] It is understood that each example / embodiment provided by the present disclosure can be combined with each other unless a contradiction occurs, but they will not be described one by one here.

[0049] As shown in Fig. 7, Fig. 7 is a schematic diagram showing a line segment formed by cutting the diameter-changing portion with a virtual plane. In this embodiment, the outer wall surface of the diameter-changing portion 314 and the virtual plane 7 form a line segment 71, and the radial distances H between each point on the line segment 71 and the axis L of the main body 31 are not all equal, and the virtual plane 7 is perpendicular to the axis L of the main body 31.

[0050] In other words, the imaginary plane 7 cuts the deformed portion 314 in a direction perpendicular to the axis L of the main body 31, so that the outer wall surface of the deformed portion 314 intersects with the imaginary plane 7 to form a line segment 71, and the radial distances H between each point on this line segment 71 and the axis L are not all equal.

[0051] The radial distances H between each point on the line segment 71 and the axis L may all be different or may not all be equal. When the radial distances H are all different, the radial distances H between each point on the line segment 71 and the axis L may gradually increase or decrease. When the radial distances H are not all equal, the distance between the midpoint of the line segment 71 and the axis L may be the shortest, the distance between both ends of the line segment 71 may be the longest, and the distances between both ends of the line segment 71 and the axis L may be equal.

[0052] It should be noted that when the transition portion 314 is a cut surface, the line segment 71 may be a straight line. In some embodiments, depending on the shape of the transition portion 314, the line segment 71 may be a curved line.

[0053] The advantages and beneficial effects of the valve core 3 and one-way valve of the embodiments of the present disclosure include at least the following:

[0054] The variable diameter section 314 is provided between two adjacent vanes 32. The variable diameter section 314 is provided on the main body 31, so that the flow area of ​​the flow passage corresponding to the variable diameter section 314 is not equal to the flow area of ​​at least one of the other flow passages. The flow passage with a large flow area receives a large fluid pressure, and the flow passage with a small flow area receives a small fluid pressure. Therefore, in the process of the fluid passing through the valve core 3, the forces received by the valve core 3 along its radial direction are different in magnitude, so that the forces received by the valve core 3 along its radial direction are not balanced, that is, the radial resultant force received by the valve core 3 is not zero. Under the action of this radial resultant force, the valve core 3 is offset in the direction of this radial resultant force, that is, the radial resultant force causes the valve core 3 to abut against the inner wall surface of the chamber of the valve body 2. As a result, when the valve core moves along the axial direction of the valve body within the valve body, one side of the valve core 3 continues to adhere to the inner wall of the valve body, thereby preventing the valve core 3 from colliding with the valve body 2 and generating noise.

[0055] In the embodiments of the present disclosure, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and the term "plurality" refers to two or more than two unless expressly limited. The terms "attached", "coupled", "connected", "fixed", etc. should all be understood in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection, and "connected" may be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the disclosure according to the specific circumstances.

[0056] In describing the embodiments of the present disclosure, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," "rear," and the like are based on the orientations or positional relationships shown in the drawings and are merely for ease of describing and simplifying the embodiments of the disclosure, and do not indicate or imply that the devices or units shown must have a particular orientation, be configured and operated in a particular manner, and should not be construed as limiting the embodiments of the disclosure.

[0057] In the description of this specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like mean that the specific features, structures, materials, or characteristics described in the embodiment or example are included in at least one embodiment or example of the disclosed embodiment. In this specification, exemplary expressions for the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics of the description can be combined as appropriate in any one or more embodiments or examples.

[0058] The above are only preferred embodiments of the disclosed embodiments, and are not intended to limit the disclosed embodiments, and those skilled in the art can make various modifications and changes to the disclosed embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the disclosed embodiments should be included within the protection scope of the disclosed embodiments.

Claims

1. a body and a plurality of vanes; The body has at least one diameter-changing portion on a side thereof, The plurality of vanes are provided on the side surfaces of the main body, and are spaced apart from each other along the circumferential direction of the main body, and a flow path is formed between each pair of adjacent vanes. a diameter-changing portion is provided in at least one of the flow paths, such that a flow area of ​​the flow path corresponding to the diameter-changing portion is not equal to a flow area of ​​at least one of the remaining flow paths; A valve core of a one-way valve, wherein an outer wall surface of the variable diameter portion and an imaginary plane form a line segment, the radial distances between each point on the line segment and the axis of the main body are not all equal, and the imaginary plane is perpendicular to the axis of the main body.

2. The valve core of a one-way valve according to claim 1 , wherein the variable diameter portion is configured as a cut surface such that the line segment is a straight line.

3. The one-way valve core according to claim 2 , wherein the cut surface and the axis of the main body are parallel to each other.

4. the body includes a constant diameter segment, a first varying diameter segment, and a second varying diameter segment; the cut surface and the side surface of the equal diameter segment form a first straight line segment and a second straight line segment, respectively; the first varying diameter segment is connected to one end of the constant diameter segment, and the cutting surface and a side surface of the first varying diameter segment form a first archwire segment; the second varying diameter segment is connected to the other end of the constant diameter segment, and the cutting surface and a side surface of the second varying diameter segment form a second archwire segment; The valve core of claim 2 , wherein the first arc line segment, the first straight line segment, the second arc line segment and the second straight line segment are connected end-to-end in sequence.

5. 5. The one-way valve core according to claim 4, wherein the blade is connected to the constant diameter segment and the second varying diameter segment, and one end of the blade protrudes from an end face of the second varying diameter segment away from the constant diameter segment.

6. The valve core of a one-way valve according to claim 1 , wherein the variable diameter portion is configured as a protrusion.

7. 2. The one-way valve core according to claim 1, wherein an included angle is formed between every two adjacent vanes along the circumferential direction of the body, and each included angle is equal.

8. The one-way valve core according to claim 1 , wherein the number of said vanes is three or more.

9. The number of the vanes is three, and the three vanes are evenly spaced along the circumferential direction of the main body; The valve core of a one-way valve according to claim 8 , wherein the number of the diameter-changing portions is two, and the two diameter-changing portions correspond to two adjacent flow paths, respectively.

10. A valve body and a valve core of a one-way valve according to any one of claims 1 to 9, The valve core is disposed within the valve body.

11. The one-way valve according to claim 10, wherein the valve body has a valve port, and the variable diameter portion of the valve core is provided at one end of the body of the valve core close to the valve port.

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