Multifunctional valve

Abstract

The utility model discloses a multifunctional valve which comprises a valve seat used for being fixed in a shell and internally provided with a valve seat channel, and a valve core arranged in the valve seat. At least part of the valve body is used for being fixed in the shell, the valve body is arranged on the downstream of the valve seat at intervals in the flowing direction of fluid, and a valve body channel is formed in the valve body; the valve element comprises a first sealing part used for sealing the valve seat channel and a second sealing part used for sealing the valve body channel. The reset piece is used for applying abutting reset force to the valve element. According to the multifunctional valve, on the basis of meeting functional requirements, the space utilization rate of a part assembly can be effectively increased, the occupied space of the part assembly is reduced, and meanwhile the weight of the part assembly is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a multifunctional valve. Background Technology

[0002] Currently, in some applications, such as pneumatic control systems, it is necessary to use combinations of different types of valves to achieve multiple functions. For example, a check valve (or one-way valve) is needed to cut off airflow, while an overflow valve is needed to limit flow. The check valve and overflow valve are set up relatively independently.

[0003] However, when existing technical solutions achieve airflow cutoff and flow restriction functions by combining check valves and relief valves, the weight of the component assembly is relatively large, which cannot meet the requirements for valve lightweighting. At the same time, the component assembly also occupies a lot of space, which cannot meet the requirements for miniaturization.

[0004] Therefore, it is necessary to propose a multifunctional valve to solve at least one of the above problems. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a multi-functional valve that, while meeting functional requirements, effectively improves the space utilization rate of the component assembly, reduces the space occupied by the component assembly, and effectively reduces the weight of the component assembly.

[0006] The specific technical solution of this utility model embodiment is as follows:

[0007] A multifunctional valve includes: a valve seat for fixing within a housing, the valve seat having a valve seat channel; a valve body, at least a portion of the valve body for fixing within the housing, and the valve body being spaced downstream of the valve seat in the direction of fluid flow, the valve body having a valve body channel; a valve core, the valve core including: a first sealing portion for sealing the valve seat channel and a second sealing portion for sealing the valve body channel; and a reset member for applying a pressing and reset force to the valve core; the multifunctional valve includes: a first state, a second state, and a third state; in the first state, the first sealing portion seals the valve seat channel; in the second state, under the action of fluid, the valve core moves away from the valve seat, and the valve seat channel can communicate with the valve body channel; in the third state, when the fluid back pressure reaches a preset value, the valve core moves further away from the valve seat, and the second sealing portion can seal the valve body channel.

[0008] In a preferred embodiment, when the first sealing part contacts and seals with the valve seat passage, a linear seal or a surface seal is formed; when the second sealing part contacts and seals with the valve body passage, a linear seal or a surface seal is formed.

[0009] In a preferred embodiment, the first sealing part is a conical surface, and the valve seat channel is provided with a conical surface that matches the first sealing part, forming a conical seal between the first sealing part and the valve seat channel; or, the first sealing part is an arcuate surface, and the valve seat channel is provided with an arcuate surface that matches the first sealing part, forming an arcuate seal between the first sealing part and the valve seat channel; the second sealing part is a conical surface, and the valve body channel is provided with a conical surface that matches the second sealing part, forming a conical seal between the second sealing part and the valve body channel; or, the second sealing part is an arcuate surface, and the valve body channel is provided with an arcuate surface that matches the second sealing part, forming an arcuate seal between the second sealing part and the valve body channel.

[0010] In a preferred embodiment, along the fluid flow direction, the valve core includes, in sequence, a valve head, a flow passage, and a guide portion. The valve head is located between the valve seat and the valve body. The first sealing portion and the second sealing portion are disposed on the valve head. The flow passage is provided with a first flow channel, and the guide portion is internally provided with a second flow channel communicating with the first flow channel. In the second state, fluid can flow sequentially through the valve seat channel, the flow channel between part of the valve body and the flow passage, the first flow channel, the second flow channel, and part of the valve body channel before flowing out of the multifunctional valve.

[0011] In a preferred embodiment, the guide portion is located within the valve body channel, the guide portion is a hollow cylinder, and the valve body channel includes a cylindrical hole that matches the guide portion.

[0012] In a preferred embodiment, the ratio of the length to the outer diameter of the guide portion is 1.5 or more.

[0013] In a preferred embodiment, a first limiting part is provided on the outer surface of the guide portion, and a second limiting part is provided on the inner wall of the valve body channel. The first limiting part and the second limiting part cooperate to form a positioning structure for ensuring that the valve core moves axially relative to the valve body.

[0014] In a preferred embodiment, the positioning structure includes a matching mechanism between a slot and a protrusion.

[0015] In a preferred embodiment, the outer contour dimension of the flow passage is smaller than the outer contour dimension of the guide portion, and the first flow channel includes: flow ports circumferentially spaced in the flow passage.

[0016] In a preferred embodiment, the flow ports are evenly spaced along the circumferential direction of the flow portion, and the flow ports include any one or a combination of the following: oblong holes, round holes.

[0017] In a preferred embodiment, the first sealing part is a conical surface with a first cone angle, the second sealing part is a conical surface with a second cone angle, and the first cone angle is smaller than the second cone angle.

[0018] In a preferred embodiment, the first cone angle is between 60° and 100°.

[0019] In a preferred embodiment, the reset member is located within the valve body channel, and both ends of the reset member abut against the valve body and the valve core.

[0020] In a preferred embodiment, the reset element includes at least one spring.

[0021] In a preferred embodiment, the multi-functional valve further includes a filter element disposed within the housing, located upstream of the valve seat along the fluid flow direction.

[0022] The technical solution of this utility model has the following significant beneficial effects:

[0023] The multi-functional valve provided in this application integrates the check valve and relief valve by improving the structure of the core components (especially the valve core) and the reasonable layout between the valve core, valve seat, and valve body. This allows the multi-functional valve to achieve the functions of both the check valve and relief valve while reducing the number of components, effectively improving the space utilization of the assembly, reducing the space occupied by the assembly, and effectively reducing the weight of the assembly, thus better meeting the requirements of lightweight and miniaturization of the multi-functional valve.

[0024] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, embodiments of the present invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0025] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0026] Figure 1 This is a schematic diagram of the external structure of a multifunctional valve provided in the embodiments of this application;

[0027] Figure 2 An exploded view of a multifunctional valve provided in the embodiments of this application;

[0028] Figure 3 This is a schematic diagram of the internal structure of a multifunctional valve provided in the embodiments of this application;

[0029] Figure 4 for Figure 1 A cross-sectional view of the multi-functional valve in its first state (AA section).

[0030] Figure 5 for Figure 1 A cross-sectional view of the multi-functional valve in its second state (AA section).

[0031] Figure 6 for Figure 1 A cross-sectional view of the multi-functional valve in its third state (AA section).

[0032] Figure 7 This is a schematic diagram of the valve core in the multifunctional valve provided in the embodiments of this application from a first-view perspective.

[0033] Figure 8 This is a schematic diagram of the valve core in the multifunctional valve provided in the embodiments of this application from a second perspective;

[0034] Figure 9 This is a front view of the valve core in a multifunctional valve provided in the embodiments of this application;

[0035] Figure 10 for Figure 9 BB cross-sectional view of the middle valve core;

[0036] Figure 11 for Figure 10 CC section view of the valve core.

[0037] Reference numerals in the figures of this application:

[0038] 1. Valve body; 10. Valve body passage;

[0039] 2. Reset component;

[0040] 3. Valve core;

[0041] 30. Valve head; 301. First sealing part; 302. Second sealing part; 303. Pressure surface;

[0042] 31. Flow section; 310. Flow outlet; 311. First flow channel;

[0043] 32. Guide section; 321. Second flow channel;

[0044] 4. Valve seat; 40. Valve seat passage;

[0045] 5. Filter;

[0046] 50. Filter element;

[0047] 51. Outer shell;

[0048] 501. Entry point;

[0049] 502. Export end. Detailed Implementation

[0050] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0051] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] This utility model provides a multi-functional valve, which is mainly improved by an integrated valve core structure. The valve cores of the original check valve and relief valve are integrated into one. While meeting functional requirements, it effectively improves the space utilization rate of the component assembly, reduces the space occupied by the component assembly, and effectively reduces the weight of the component assembly, thereby meeting the requirements of lightweight and miniaturization of the multi-functional valve.

[0054] Please refer to the following for comprehensive information. Figures 1 to 11 This application specification provides a multi-functional valve, which may include: a valve seat 4, which is fixed inside a housing 51, and a valve seat channel 40 is provided inside the valve seat 4; a valve body 1, at least a portion of which is fixed inside the housing 51, and the valve body 1 is spaced downstream of the valve seat 4 in the direction of fluid flow, and a valve body channel 10 is provided inside the valve body 1; a valve core 3, which includes: a first sealing part 301 for sealing the valve seat channel 40 and a second sealing part 302 for sealing the valve body channel 10; and a reset member 2, which is used to apply a clamping reset force to the valve core 3.

[0055] The multi-functional valve includes: a first state, a second state, and a third state, such as... Figure 4 As shown, in the first state, the first sealing part 301 seals the valve seat passage 40; as Figure 5 As shown, in the second state, under the action of fluid, the valve core 3 moves away from the valve seat 4, and the valve seat channel 40 can communicate with the valve body channel 10; as Figure 6 As shown, in the third state, when the fluid back pressure reaches a preset value, the valve core 3 moves further away from the valve seat 4, and the second sealing part 302 can seal the valve body channel 10.

[0056] In this embodiment, the multi-functional valve is an integrated multi-functional valve, which is mainly improved by the structure of the integrated valve core 3. The valve cores of the original check valve and relief valve are integrated into one valve core 3. The valve core 3 works with other components to effectively improve the space utilization of the component assembly, reduce the space occupied by the component assembly, and effectively reduce the weight of the component assembly while meeting the requirements of airflow cut-off and flow restriction functions. This meets the requirements of lightweight and miniaturization of the multi-functional valve.

[0057] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0058] Please refer to the following: Figure 1 , Figure 2 and Figure 3 The multi-functional valve mainly includes: valve seat 4, valve body 1, valve core 3, and reset component 2.

[0059] The valve seat 4 can be fixed inside the housing 51. Specifically, the housing 51 can be the housing 51 of the filter 5. Of course, the specific form of the housing 51 can vary depending on the specific installation location of the multi-functional valve. In the embodiments of this application, the housing 51 of the filter 5 is mainly used as an example for illustration. In other installation scenarios, the embodiments of this application can be adapted by referring to them. This application will not describe them in detail here.

[0060] The valve seat 4 can be detachably connected to the housing 51, which facilitates timely and convenient maintenance and replacement of the valve seat 4. Specifically, the detachable connection can be a threaded connection, or it can be other forms, such as a snap-fit ​​connection, etc., which are not specifically limited here. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should be covered within the scope of protection of this application.

[0061] Of course, in this embodiment, it is not excluded that the valve seat 4 may be fixed in the housing 51 in a non-removable manner. This non-removable manner may be welding or integral molding, etc.

[0062] In this embodiment, the valve seat 4 can be a hollow rotating body as a whole. For example, the valve seat 4 can be roughly a hollow cylinder with a certain axial length. Taking the connection between the valve seat 4 and the outer shell 51 via a thread as an example, the outer surface of the valve seat 4 can be provided with an external thread, and the inner wall of the outer shell 51 is provided with an internal thread that matches the external thread of the valve seat 4.

[0063] like Figure 5 As shown, the valve seat 4 has an axially penetrating valve seat channel 40. (As indicated...) Figure 4 As shown, the valve seat channel 40 of the valve seat 4 is located on the side near the valve core 3 and is used to cooperate with the first sealing part 301 of the valve core 3 to realize the shut-off function of the multi-functional valve.

[0064] The housing 51 is a hollow tube with an inlet end 501 and an outlet end 502. Fluid flows into the housing 51 through the inlet end 501 and flows along the axial direction of the housing 51 toward the outlet end 502. The valve seat 4 and the valve body 1 are arranged at intervals along the axial direction of the housing 51.

[0065] In the direction of fluid flow, the valve body 1 is spaced downstream of the valve seat 4. At least a portion of the valve body 1 is fixed within the housing 51. The valve body 1 can be detachably connected to the housing 51, which facilitates timely and convenient inspection and replacement of the valve body 1 and the reset component 2, valve core 3, etc. within the valve body 1. Specifically, the detachable connection can be a threaded connection, or it can be other forms, such as a snap-fit ​​connection, etc., which are not specifically limited here. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should be covered within the scope of protection of this application.

[0066] Of course, in this embodiment, it is not excluded that the valve body 1 may be fixed in the housing 51 in a non-removable manner. This non-removable manner may be welding or integral molding, etc.

[0067] In this embodiment, the valve body 1 can be a hollow rotating body as a whole. For example, the valve body 1 can be roughly a hollow cylinder with a certain axial length. Taking the connection between the valve body 1 and the outer shell 51 via a thread as an example, the outer surface of the valve body 1 can be provided with an external thread, and the inner wall of the outer shell 51 is provided with an internal thread that matches the external thread of the valve body 1.

[0068] like Figure 6 As shown, the valve body 1 is provided with an axially penetrating valve body channel 10. The side of the valve body channel 10 near the valve core 3 is used to cooperate with the second sealing part 302 of the valve core 3 to realize the flow limiting function of the multi-functional valve.

[0069] like Figure 7 and Figure 8 As shown, the valve core 3 may include a valve head 30 located between the valve seat 4 and the valve body 1. The valve head 30 can be a rotating body; for example, it can be a solid structure with a variable cross-section and a certain axial length. In the flow direction, the valve core 3 has a pressure surface 303, which can be circular. The pressure required to move the valve core 3 can be changed by adjusting the area of ​​the pressure surface 303. Of course, the shape of the pressure surface 303 is not limited to the example described above. The valve head 30 has a first sealing portion 301 for sealing the valve seat passage 40 and a second sealing portion 302 for sealing the valve body passage 10 along its axial direction.

[0070] It should be noted that in this embodiment, the specific structure of the valve head 30 is not limited to the example above. For example, in order to reduce the weight of the valve head 30, the valve head 30 can also be set as a hollow structure or a partially hollow structure. It is only necessary to ensure that the pressure surface 303 and the outer contour of the periphery surrounding the pressure surface 303 to form the first sealing part 301 and the second sealing part 302 are a relatively closed structure, thereby meeting the functional requirements of the multi-functional valve.

[0071] As a feasible option, when the first sealing part 301 contacts and seals with the side of the valve seat passage 40 near the valve core 3, it can be a linear seal or a surface seal. Similarly, when the second sealing part 302 contacts and seals with the side of the valve body passage 10 near the valve core 3, it can be a linear seal or a surface seal. Generally speaking, the sealing effect of a surface seal is higher than that of a linear seal in most cases. However, due to the large area of ​​the sealing surface, debris is relatively easy to accumulate or remain there, which can lead to incomplete sealing and leakage.

[0072] In some embodiments, the first sealing part 301 is a conical surface, and the valve seat channel 40 is provided with a conical surface that matches the first sealing part 301, forming a conical seal between the first sealing part 301 and the valve seat channel 40; or, the first sealing part 301 is an arcuate surface, and the valve seat channel 40 is provided with an arcuate surface that matches the first sealing part 301, forming an arcuate seal between the first sealing part 301 and the valve seat channel 40.

[0073] In this embodiment, a conical seal or an arcuate seal is formed between the first sealing part 301 and the valve seat passage 40. Taking the conical seal as an example, the conical surface of the valve core 3 and the conical surface of the valve seat 4 are tightly fitted to achieve a seal. When the valve core 3 closes the valve seat passage 40, the contact area between the conical surfaces gradually increases, and the sealing specific pressure also increases accordingly. The higher the sealing specific pressure, the stronger the ability to prevent fluid leakage, thereby ensuring that a high sealing level can be achieved between the first sealing part 301 and the valve seat 4 in the first state. The arcuate seal is similar to the conical seal; its arcuate contact surface can fit well under pressure, reducing fluid leakage.

[0074] The conical sealing structure has a self-centering function. When two conical surfaces come into contact, they automatically align with the center. Due to the inherent shape of the arc surface, the arc-shaped seal can adapt to a certain degree of installation deviation and flow channel deformation, exhibiting excellent self-adaptability.

[0075] For conical seals, during fluid flow, the scouring force of the medium on the sealing surface can be decomposed into two components: one perpendicular to the conical surface and the other parallel to it. Due to the angle of the conical surface, the scouring force parallel to the conical surface is dispersed to some extent, reducing direct scouring and wear on the sealing surface. Moreover, when the sealing surfaces have good contact, it is difficult for the medium to enter between the sealing surfaces, further reducing the possibility of erosion.

[0076] Arc-shaped seals also exhibit good erosion resistance. The streamlined design of the arc surface allows fluid to flow smoothly over the sealing surface, reducing turbulence and localized high-speed erosion areas. Especially under high-speed fluid conditions, valves with arc-shaped seals can withstand high-velocity fluid erosion, thereby extending the valve's service life.

[0077] In some embodiments, the second sealing part 302 is a conical surface, and the valve body channel 10 is provided with a conical surface that matches the second sealing part 302, forming a conical seal between the second sealing part 302 and the valve body channel 10; or, the second sealing part 302 is an arcuate surface, and the valve body channel 10 is provided with an arcuate surface that matches the second sealing part 302, forming an arcuate seal between the second sealing part 302 and the valve body channel 10.

[0078] In this embodiment, a conical seal or an arcuate seal is formed between the second sealing part 302 and the valve body passage 10. Specifically, the advantages of the conical seal and the arcuate seal can be referred to the detailed description of the conical seal and arcuate seal embodiments of the first sealing part 301 and the valve seat passage 40 described above, which will not be repeated here.

[0079] like Figure 4 As shown, in one embodiment, the first sealing part 301 is a conical surface with a first cone angle α, the second sealing part 302 is a conical surface with a second cone angle, and the first cone angle α is smaller than the second cone angle.

[0080] In this embodiment, taking the example that both the first sealing part 301 and the second sealing part 302 are conical surfaces, the first cone angle α of the conical surface of the first sealing part 301 is smaller than the second cone angle of the conical surface of the second sealing part 302, so as to ensure the force balance between the valve core 3 and the fluid.

[0081] Specifically, the first sealing part 301 and the valve seat 4 function as a check valve (one-way valve). When the first cone angle α is small, when the fluid flows in the forward direction from the inlet end 501 to the outlet end 502 of the housing, the valve core 3 can be more easily opened by the fluid pressure, which reduces the opening pressure, reduces the resistance to fluid flow, and allows the fluid to pass through the check valve more smoothly. The second sealing part 302 and the valve body 1 function as a relief valve for controlling the system pressure. When the second cone angle is large, the larger second cone angle is beneficial for more precise control of flow rate and pressure.

[0082] like Figure 4 As shown, in one specific embodiment, the first cone angle α is between 60° and 100°.

[0083] Of course, the embodiments of this application do not exclude the possibility that the minimum value of the first cone angle α is slightly less than 60°. For example, the minimum value of the first cone angle α can be 59°, 58°, etc. When the minimum value of the first cone angle α is slightly less than 60°, it can still achieve the same effect as the minimum boundary value (60°) in terms of function. Similarly, the embodiments of this application do not exclude the possibility that the maximum value of the first cone angle α is slightly greater than 100°. For example, the maximum value of the first cone angle α can be 101°, 102°, etc. When the maximum value of the first cone angle α is slightly greater than 100°, it can still achieve the same effect as the maximum boundary value (100°) in terms of function.

[0084] Please refer to the following: Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 In one embodiment, along the fluid flow direction, the valve core 3 includes, in sequence, a valve head 30, a flow passage 31, and a guide portion 32, wherein the valve head 30 is located between the valve seat 4 and the valve body 1. A first sealing portion 301 and a second sealing portion 302 are disposed on the valve head 30, the flow passage 31 is provided with a first flow channel 311, and the guide portion 32 has a second flow channel 321 communicating with the first flow channel 311. Figure 5 As shown, in the second state, the fluid can flow sequentially through the valve seat channel 40, the flow channel between part of the valve body 1 and the flow passage 31, the first flow channel 311, the second flow channel 321, and part of the valve body channel 10 before flowing out of the multi-functional valve.

[0085] In this embodiment, the valve core 3 may include a valve head 30, a flow passage 31, and a guide 32 arranged sequentially along the fluid flow direction. The valve head 30 is located between the valve seat 4 and the valve body 1. The valve head 30 can move axially away from the valve seat 4 under the action of the fluid, and it can also move axially closer to the valve seat 4 under the action of the reset member 2. A first sealing part 301 and a second sealing part 302 are arranged on the valve head 30 at a predetermined distance along the axial direction. The distance between the valve body 1 and the valve seat 4 is greater than the predetermined distance between the first sealing part 301 and the second sealing part 302. Specifically, the specific values ​​of the distance between the valve body 1 and the valve seat 4, and the predetermined distance between the first sealing part 301 and the second sealing part 302, can be determined comprehensively based on factors such as the valve core 3 lift, the flow rate achievable at that lift, and the weight of the valve core 3. This application does not impose specific limitations on these values.

[0086] The flow passage 31 and the guide portion 32 can be disposed within the valve body channel 10 of the valve body 1. The flow passage 31 can be a hollow tube, with one end connected to the valve core 3 and the other end connected to the guide portion 32. The flow passage 31 is provided with a first flow channel 311, which is used to connect the gap outside the filter element 50 with the internal cavity of the filter element 50.

[0087] Specifically, the outer contour dimension of the flow passage 31 is smaller than the outer contour dimension of the guide portion 32, thereby forming an annular gap between the flow passage 31 and the valve body 1. Please refer to [reference needed]. Figure 5 When the functional valve is in the second state, the fluid can pass through the gap between the valve seat channel 40, the valve body channel 10 and the second sealing part 302, and the annular gap between the valve body 1 and the flow passage 31, and then flow out of the multi-functional valve in sequence into the first flow channel 311, the second flow channel 321 and part of the valve body channel 10.

[0088] The first flow channel 311 may include flow ports 310 that are circumferentially spaced in the flow section 31.

[0089] The flow port 310 can serve as the inlet of the first flow channel 311. Specifically, the flow port 310 can be a waist-shaped hole, a circular hole, or any other regular shape that is evenly spaced along the circumference, so that the fluid has a sufficient flow cross section while ensuring the uniformity and stability of the fluid flow. For example, with Figure 10 and Figure 11 As shown, the flow port 310 may include four oblong holes, which are evenly distributed at 90° intervals along the circumference. Of course, in this embodiment, it is not excluded that the shape of the flow port 310 is irregular; any shape that meets the flow requirements can also be used.

[0090] In one embodiment, the guide portion 32 is located within the valve body channel 10, and the guide portion 32 is a hollow cylinder. The valve body channel 10 may include a cylindrical hole that matches the guide portion 32.

[0091] In this embodiment, the guide portion 32 can be located within the valve body channel 10, specifically, the guide portion 32 and the valve body channel 10 can be in a small clearance fit. The outer surface dimensions of the guide portion 32 and the inner wall dimensions of the valve body channel 10 can be the same or nearly the same. This allows the valve body channel 10 to limit the guide portion 32 when it moves axially within the valve body channel 10, ensuring that the axis of the guide portion 32 is parallel or nearly parallel to the axis of the valve body channel 10.

[0092] Specifically, the guide portion 32 is a hollow cylinder, and the inner wall of the valve body channel 10 has a cylindrical hole that matches the guide portion 32. The diameter of the cylindrical hole can be the same as or close to the outer diameter of the guide portion 32, thereby ensuring that the guide portion 32 can be reliably aligned when it moves relative to the axis of the valve body channel 10, thus ensuring that the valve core 3 can efficiently and reliably cooperate with the valve body 1 or the valve seat 4 to achieve a seal.

[0093] Furthermore, the ratio of the length to the outer diameter of the guide portion 32 is greater than 1.5.

[0094] In theory, in order to ensure that the guide part 32 has a better centering effect after it is matched with the valve body channel 10, the larger the ratio of the length of the guide part 32 to its outer diameter, the better. Specifically, the ratio of the length of the guide part 32 to its outer diameter can be greater than 1.5, so as to ensure the guiding and centering effect of the guide part 32.

[0095] In one embodiment, a first limiting part is provided on the outer surface of the guide part 32, and a second limiting part is provided on the inner wall of the valve body channel 10. The first limiting part and the second limiting part cooperate to form a positioning structure for ensuring that the valve core 3 moves axially relative to the valve body 1.

[0096] In this embodiment, in order to improve the centering effect of the guide portion 32, a first limiting portion can be provided on the outer surface of the guide portion 32. Correspondingly, a second limiting portion can be provided on the inner wall of the valve body channel 10. The first limiting portion and the second limiting portion cooperate to form a positioning structure that ensures the valve core 3 moves axially relative to the valve body 1. That is, it can ensure that the valve core 3 has a good centering degree when it moves, thereby ensuring that the valve core 3 can cooperate with the valve body 1 or the valve seat 4 efficiently and reliably to achieve sealing.

[0097] The positioning structure may include a mating mechanism between a slot and a protrusion. Specifically, one of the first limiting part and the second limiting part may be a slot, and the other may be a protrusion. For example, taking the first limiting part as a protrusion and the second limiting part as a slot as an example. The first limiting part may specifically be multiple protrusions disposed on the outer surface of the guide part 32, and the multiple protrusions may be evenly distributed along the circumferential direction.

[0098] The second limiting part can specifically be a plurality of grooves provided on the inner wall surface of the valve body channel 10, and the plurality of grooves can be evenly distributed along the circumferential direction.

[0099] Of course, the specific configuration of the positioning structure can also be in other ways, and is not limited to the above description. Those skilled in the art may make other changes under the guidance of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the scope of protection of this application.

[0100] In this embodiment, the reset member 2 is used to provide a retaining force for the valve core 3. Specifically, the reset member 2 is located within the valve body channel 10, and both ends of the reset member 2 abut against the valve body 1 and the valve core 3. Specifically, the reset member 2 may include at least one spring. In this embodiment, the reset member 2 is illustrated using a spring as an example.

[0101] like Figure 4 As shown, when the multi-functional valve is in the first state, the spring is in a pre-compressed state, providing a clamping force to the valve core 3, ensuring a sealing fit between the valve core 3 and the valve seat 4. Please refer to [reference needed]. Figure 4 and Figure 6 When the multi-functional valve switches from the third state to the first state, the reset member 2 provides a reset force to the valve core 3, causing the valve core 3 to move closer to the valve seat 4, thereby making the valve core 3 and the valve seat 4 seal together.

[0102] In one embodiment, the multi-functional valve may further include a filter element 50 disposed within the housing 51, located upstream of the valve seat 4 along the fluid flow direction.

[0103] In this embodiment, the multifunctional valve may also include a filter element 50. Specifically, the filter element 50 may be located upstream of the valve seat 4. The fluid needs to flow through the filter element 50 first before flowing into the valve seat channel 40 of the valve seat 4.

[0104] By installing a filter element 50 upstream of the valve seat 4, the fluid can be filtered, intercepting particulate impurities. If these impurities enter the valve along with the fluid, they may continuously rub against the sealing surfaces of the valve core 3, valve seat 4, and valve body 1 during valve opening and closing, leading to decreased sealing performance, internal leakage, accelerated component wear, and shortened valve lifespan. However, in this embodiment, by installing a filter element 50 upstream of the valve seat 4, impurities can be intercepted in advance, effectively reducing damage to the valve and maintaining its good working condition and performance.

[0105] In a specific application scenario, let's take hydrogen gas flowing through this multi-functional valve as an example to illustrate its working principle. Specifically, this multi-functional valve integrates the functions of a check valve and a relief valve.

[0106] Please refer to the following: Figure 4 , Figure 5 and Figure 6 Specifically, the multi-functional valve includes: a first state, a second state, and a third state.

[0107] The principle by which a multi-functional valve achieves the function of a check valve is as follows:

[0108] In the initial first state, the valve core 3 is located in the first position, and the first sealing part 301 of the valve core 3 forms a seal with the valve seat 4 under the action of the spring elasticity to prevent hydrogen from escaping.

[0109] The principle by which a multi-functional valve achieves the function of an overflow valve is as follows:

[0110] In the second state, when the overflow valve is in operation, the solenoid valve upstream of the overflow valve that controls the flow of hydrogen can be in the open state, allowing hydrogen at a certain pressure to flow into the inlet end 501 of the housing 51. Under the action of the hydrogen, the valve core 3 overcomes the elastic force of the spring and moves from the first position away from the valve seat 4 to the second position. The valve seat channel 40 is connected to the valve body channel 10. At this time, the hydrogen can flow normally, that is, the hydrogen flowing in from the inlet end 501 of the housing 51 can flow through the multi-functional valve and then flow out from the outlet end 502 of the housing 51.

[0111] In the third state, when the back pressure of hydrogen reaches a preset value, the valve core 3 moves from the second position away from the valve seat 4 to the third position, and the second sealing part 302 seals the valve body channel 10 to prevent hydrogen from continuing to flow.

[0112] Furthermore, when the relief valve is in a non-operating state, the upstream solenoid valve controlling the flow of hydrogen can be closed. At this time, under the restoring force of the spring, the valve core 3 and the valve seat 4 form a conical seal to prevent gas flow. The process of the relief valve changing from an operating state to a non-operating state is equivalent to switching from a second or third state to a first state.

[0113] The multi-functional valve provided in this application integrates the check valve and relief valve through structural improvements to the core components (especially the valve core 3) and a rational layout between the valve core 3, valve seat 4, and valve body 1. This allows the multi-functional valve to perform the functions of both check valves and relief valves while reducing the number of components, effectively improving the space utilization of the assembly, reducing the space occupied by the assembly, and effectively reducing the weight of the assembly, thus better meeting the requirements for lightweight and miniaturized multi-functional valves. Furthermore, simulation verification has shown that this multi-functional valve exhibits good reliability and performance during use.

[0114] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0115] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0116] The above are merely a few embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. A multifunctional valve, characterized in that, The multi-functional valve includes: A valve seat, which is used to fix the valve seat inside the housing, and a valve seat channel is provided inside the valve seat; A valve body, at least a portion of which is used to fix the valve body within the housing, and the valve body is spaced downstream of the valve seat in the direction of fluid flow, and a valve body passage is provided within the valve body; The valve core includes: a first sealing portion for sealing the valve seat passage and a second sealing portion for sealing the valve body passage; A reset element, which is used to apply a clamping reset force to the valve core; The multi-functional valve includes: a first state, a second state, and a third state. In the first state, the first sealing part seals the valve seat passage; In the second state, under the action of fluid, the valve core moves away from the valve seat, and the valve seat channel can be connected to the valve body channel; In the third state, when the fluid back pressure reaches a preset value, the valve core moves further away from the valve seat, and the second sealing part can seal the valve body passage.

2. The multifunctional valve as described in claim 1, characterized in that, When the first sealing part contacts and seals with the valve seat passage, it forms a linear seal or a surface seal; when the second sealing part contacts and seals with the valve body passage, it forms a linear seal or a surface seal.

3. The multifunctional valve as described in claim 1, characterized in that, The first sealing part is a conical surface, and the valve seat channel is provided with a conical surface that matches the first sealing part, forming a conical seal between the first sealing part and the valve seat channel; or, the first sealing part is an arc-shaped surface, and the valve seat channel is provided with an arc-shaped surface that matches the first sealing part, forming an arc-shaped seal between the first sealing part and the valve seat channel. The second sealing part is a conical surface, and the valve body channel is provided with a conical surface that matches the second sealing part, forming a conical seal between the second sealing part and the valve body channel; or, the second sealing part is an arc-shaped surface, and the valve body channel is provided with an arc-shaped surface that matches the second sealing part, forming an arc-shaped seal between the second sealing part and the valve body channel.

4. The multifunctional valve as described in claim 1, characterized in that, Along the fluid flow direction, the valve core includes, in sequence, a valve head, a flow passage, and a guide portion. The valve head is located between the valve seat and the valve body. The first sealing portion and the second sealing portion are disposed on the valve head. The flow passage is provided with a first flow channel. The guide portion is provided with a second flow channel communicating with the first flow channel. In the second state, the fluid can flow sequentially through the valve seat channel, the flow channel between part of the valve body and the flow passage, the first flow channel, the second flow channel, and part of the valve body channel before flowing out of the multifunctional valve.

5. The multifunctional valve as described in claim 4, characterized in that, The guide portion is located within the valve body channel and is in the shape of a hollow cylinder. The valve body channel includes a cylindrical hole that matches the guide portion.

6. The multifunctional valve as described in claim 5, characterized in that, The ratio of the length to the outer diameter of the guide portion is greater than 1.

5.

7. The multifunctional valve as described in claim 4 or 5, characterized in that, The outer surface of the guide portion is provided with a first limiting portion, and the inner wall of the valve body channel is provided with a second limiting portion. The first limiting portion and the second limiting portion cooperate to form a positioning structure for ensuring that the valve core moves axially relative to the valve body.

8. The multifunctional valve as described in claim 7, characterized in that, The positioning structure includes a matching mechanism between a slot and a protrusion.

9. The multifunctional valve as described in claim 4 or 5, characterized in that, The outer contour dimension of the flow passage is smaller than the outer contour dimension of the guide portion, and the first flow channel includes: flow ports that are circumferentially spaced in the flow passage.

10. The multifunctional valve as described in claim 9, characterized in that, The flow ports are evenly spaced along the circumference of the flow section, and the flow ports include any one or a combination of the following: waist-shaped holes and round holes.

11. The multifunctional valve as described in claim 1, characterized in that, The first sealing part is a conical surface with a first cone angle, the second sealing part is a conical surface with a second cone angle, and the first cone angle is smaller than the second cone angle.

12. The multifunctional valve as described in claim 11, characterized in that, The first cone angle is between 60° and 100°.

13. The multifunctional valve as described in claim 1, characterized in that, The reset element is located within the valve body channel, and both ends of the reset element abut against the valve body and the valve core.

14. The multifunctional valve as described in claim 1 or 13, characterized in that, The reset element includes at least one spring.

15. The multifunctional valve as described in claim 1, characterized in that, The multi-functional valve also includes a filter element disposed within the housing, located upstream of the valve seat along the fluid flow direction.

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