One-way valve with bidirectional limiting integral double-valve core structure

Abstract

This invention provides a one-way valve with a bidirectional limiting integral dual-valve-core structure to solve the technical problem that existing technologies have complex overall structures and long dimensions, making them difficult to adapt to large vibration dynamic environments. The invention includes a housing, a dual-valve-core assembly, a first elastic element, and a base. The dual-valve-core assembly includes a first valve core, a second valve core, and a second elastic element. The first valve core includes a first circular baffle, a first sealing ring, a first connecting post, and a valve core cylinder that slides with the base. The second valve core includes a second circular baffle, a second sealing ring, and a second connecting post. The first and second sealing rings form a first sealing structure and a second sealing structure with the housing, respectively. The second connecting post is fitted inside the first connecting post. The first elastic element is fitted outside the valve core cylinder and abuts against the first circular baffle and the base. The second elastic element is fitted outside the first connecting post and abuts against the second circular baffle and the first circular baffle. The first sealing ring has a locking groove for fitting the second sealing ring.

Description

Technical Field

[0001] This invention relates to a check valve, specifically a check valve employing a bidirectional limiting integral double valve core structure. Background Technology

[0002] In pipelines of high-pressure, high-temperature, or low-temperature media control systems, check valves are commonly used to control the flow direction of the main medium. These valves are generally single-core structures, and their sealing performance deteriorates after repeated use, affecting their operational reliability. Therefore, to improve the sealing reliability of check valves, most currently used check valves are dual-core tandem structures, with the two cores installed independently.

[0003] Chinese patent CN202992283U discloses a series dual-valve-core high-pressure redundant sealing check valve, including a housing, a spring seat, a first elastic element, an outlet valve seat, an outlet valve core, an inlet valve seat, and an inlet valve core arranged sequentially in the housing. One end of the first elastic element is fixed to the spring seat, and the other end presses the outlet valve core onto the outlet valve seat to achieve a sealing fit between the outlet valve core and the outlet valve seat. The first elastic element is fitted onto the outlet valve core, with one end fixed to the outlet valve core and the other end pressing the inlet valve core onto the inlet valve seat to achieve a sealing fit between the inlet valve core and the inlet valve seat.

[0004] However, the common shortcomings of these existing technologies are that the overall structure is relatively complex and the dimensions are relatively long, which makes it difficult to adapt to large vibration dynamic environments. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that the existing double-valve core structure of the check valve is relatively complex in overall structure and long in size, which makes it difficult to adapt to large vibration dynamic environment, and to provide a check valve with a bidirectional limiting integral double-valve core structure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A one-way valve employing a bidirectional limiting integral dual-valve-core structure includes a housing, a base, a first elastic element, and a valve core assembly; the valve core assembly, the first elastic element, and the base are disposed within the housing; the housing is provided with an inlet and an outlet; its special feature is:

[0008] The valve core assembly is a dual valve core assembly; the dual valve core assembly includes a first valve core, a second valve core, and a second elastic element;

[0009] The first valve core includes a valve core cylinder, a first circular baffle disposed at one end of the valve core cylinder near the inlet, a first sealing ring disposed on the edge of the first circular baffle and facing the inlet, and a first connecting post disposed at the center of the first circular baffle and extending toward the inlet; the first sealing ring and the housing form a first sealing structure within the inlet; the valve core cylinder is slidably fitted with the base;

[0010] The second valve core includes a second circular baffle, a second sealing ring disposed on the edge of the second circular baffle, and a second connecting post disposed in the middle of the second circular baffle and extending toward the outlet direction; the second sealing ring and the housing form a second sealing structure in the inlet; the second connecting post is fitted into the first connecting post in a clearance fit manner;

[0011] The first elastic element is fitted on the outside of the valve core cylinder, and its two ends abut against the first circular baffle and the base respectively, in order to maintain the first sealing structure in a normally closed state;

[0012] The second elastic element is fitted on the outside of the first connecting column, and its two ends abut against the second circular baffle and the first circular baffle respectively, in order to maintain the second sealing structure in a normally closed state.

[0013] The first sealing ring has a circumferentially provided groove on its inner side, and the second sealing ring is fitted into the groove on the inner side of the first sealing ring and can move axially within the groove.

[0014] Furthermore, the inner wall of the first sealing ring has a plurality of inwardly extending U-shaped protrusions evenly distributed around its circumference, with the openings of the U-shaped protrusions facing the first circular baffle. The inner side of the U-shaped protrusions forms the mounting groove. The outer wall of the second sealing ring has a corresponding number of outwardly extending first bosses evenly distributed around its circumference, the same number as the U-shaped protrusions. The curvature of the first bosses is smaller than the curvature between adjacent U-shaped protrusions. The first bosses are located between the U-shaped protrusions and the first circular baffle and are axially movable. The outer wall of the first bosses is in clearance fit with the inner wall of the first sealing ring.

[0015] A second boss is provided on the end face of the second sealing ring near the inlet, and the second boss and the housing form the second sealing structure inside the inlet.

[0016] Furthermore, to further facilitate the assembly and disassembly of the second valve core and the first valve core, the U-shaped protrusion includes an L-shaped protrusion and a metal sheet; the metal sheet is disposed at one end of the L-shaped protrusion.

[0017] Furthermore, to prevent leakage of the flow medium and to more easily ensure the machining accuracy of the second boss and the first sealing ring, the housing includes an inlet housing and an outlet housing that are screwed together; the inlet housing is provided with a first step and a second step; a third boss and a fourth boss are provided on the first step; the first sealing ring and the third boss constitute the first sealing structure; the second boss and the fourth boss constitute the second sealing structure.

[0018] The base is installed between one end face of the outlet housing and the second step.

[0019] Furthermore, the second circular baffle includes a frustum and a conical cylinder coaxially connected to each other; the second connecting column is a hollow variable-diameter cylinder; the hollow variable-diameter cylinder is disposed in the middle of the large end face of the frustum, and its large diameter section is fitted into the first connecting column in a clearance fit manner, while the small diameter section is close to the large end face of the frustum; the second sealing ring is disposed on the edge of the conical cylinder; the two ends of the second elastic element abut against the large end face of the frustum and the first circular baffle, respectively.

[0020] The use of a hollow variable-diameter cylinder is to reduce weight and prevent the second valve core from becoming misaligned and stuck.

[0021] Furthermore, a first limiting groove is provided on the first circular baffle along the outer periphery of the first connecting post; a second limiting groove corresponding to the first limiting groove is provided on the large end face of the frustum along the outer periphery of the small diameter section of the second connecting post; the two ends of the second elastic member are respectively located in the first limiting groove and the second limiting groove.

[0022] Furthermore, the valve core cylinder is provided with multiple through holes for the first valve core to communicate with the outside world after opening to balance the pressure; the inner cavity of the valve core cylinder near the inlet is provided with a threaded hole for easy fixation of the first valve core by external tooling during assembly; the second sealing ring is provided with multiple first through grooves on the end face near the valve core cylinder to prevent the formation of a closed cavity between the second valve core and the first circular baffle after opening; the outer wall of the large diameter section of the second connecting column is provided with multiple second through grooves to prevent the formation of a closed cavity between the second connecting column and the first connecting column after the second valve core is opened.

[0023] Furthermore, the small end of the frustum is provided with multiple mounting slots for embedding external tooling, which facilitates the installation of the second valve core and the first valve core.

[0024] Furthermore, the frustum, the conical cylinder, and the second sealing ring are an integral structure; the valve core cylinder, the first circular baffle, and the first sealing ring are also an integral structure.

[0025] Furthermore, in order to prevent the medium inside the shell cavity from leaking out, the connection between the inlet shell and the outlet shell at the outlet end is welded.

[0026] Both the first elastic element and the second elastic element are springs.

[0027] The beneficial effects of this invention are:

[0028] 1. This invention provides a one-way valve employing a bidirectional limiting integral dual-valve-core structure, which has a simple overall structure and short dimensions. Specifically, the first sealing ring of the first valve core has a locking groove on its inner side, and the second sealing ring of the second valve core is fitted into the locking groove, forming an integral dual-valve-core structure. This shortens the axial length, making the overall structure of the one-way valve more compact and smaller in size, enhancing its adaptability to large vibration dynamics environments, and improving its ease of use and maintenance. Furthermore, the first and second sealing structures in this invention form a double redundant seal, greatly improving the sealing reliability of the one-way valve.

[0029] 2. The U-shaped protrusion in this invention forms a locking groove on its inner side, which can realize the axial and circumferential limiting of the second valve core and prevent the second valve core from coming out of the first valve core during operation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the closed state of a one-way valve embodiment of the present invention, which employs a bidirectional limiting integral double valve core structure.

[0031] Figure 2 This is a schematic diagram of the structure in the open state according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the dual valve core assembly in an embodiment of the present invention;

[0033] Figure 4 This is a three-dimensional structural diagram of the first valve core in an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of the first valve core in an embodiment of the present invention (the metal sheet is not bent);

[0035] Figure 6 for Figure 5 The left view;

[0036] Figure 7 This is a schematic diagram of the structure of the second valve core in an embodiment of the present invention;

[0037] Figure 8 for Figure 7 The right view;

[0038] Figure 9 for Figure 7 The left view.

[0039] Icon labels:

[0040] 1-Housing, 2-Dual valve core assembly, 3-First elastic element, 4-Base, 5-Second valve core, 50-Second circular baffle, 6-Second elastic element, 7-First valve core, 8-Valve core cylinder, 80-Through hole, 9-First circular baffle, 90-First sealing ring, 10-First connecting post, 11-Frustum, 110-Second connecting post, 111-Second limiting groove, 112-Second through groove, 113-Mounting groove, 12-Conical cylinder, 13-Second sealing ring, 130-First boss, 131-Second boss, 132-First through groove, 14-U-shaped protrusion, 140-L-shaped protrusion, 141-Metal sheet, 15-First limiting groove, 16-Outlet housing, 17-Inlet housing, 18-Inlet, 19-Outlet, 20-First step, 21-Second step, 22-Third boss, 23-Fourth boss. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] like Figures 1-3As shown, a one-way valve with a bidirectional limiting integral dual-valve-core structure includes a housing 1, a base 4, a first elastic element 3, and a valve core assembly. In this embodiment, the valve core assembly is a dual-valve-core assembly 2. The dual-valve-core assembly 2, the first elastic element 3, and the base 4 are disposed inside the housing 1. The housing 1 is provided with an inlet 18 and an outlet 19. In this embodiment, the housing 1 includes an inlet housing 17 and an outlet housing 16 that are screwed together. The inlet housing 17 is welded to the outlet housing 16 at the end facing the outlet 19. In addition, a first step 20 and a second step 21 are provided inside the inlet housing 17. The base 4 is installed between one end face of the outlet housing 16 and the second step 21. A third boss 22 and a fourth boss 23 are provided on the first step 20. Specifically, the dual valve core assembly 2 includes a first valve core 7, a second valve core 5, and a second elastic element 6. The first valve core 7 includes a valve core cylinder 8, a first circular baffle 9 disposed at one end of the valve core cylinder 8 near the inlet 18, a first sealing ring 90 disposed along the edge of the first circular baffle 9 and facing the inlet 18, and a first connecting post 10 disposed at the center of the first circular baffle 9 and extending towards the inlet 18. A first limiting groove 15 is provided on the first circular baffle 9 along the outer periphery of the first connecting post 10. The valve core cylinder 8 is slidably engaged with the base 4. The core cylinder 8 has multiple through holes 80 for connecting the first valve core 7 to the outside environment to balance pressure after opening. In this embodiment, there are four through holes 80. The inner cavity of the valve core cylinder 8 near the inlet 18 is provided with a threaded hole to facilitate the external tooling to fix the first valve core 7 during assembly. In addition, the first sealing ring 90 and the third boss 22 form a first sealing structure. The first elastic element 3 is fitted on the outside of the valve core cylinder 8, and its two ends abut against the first circular baffle 9 and the base 4 respectively, to maintain the first sealing structure in a normally closed state. Figures 4-6 As shown, the inner wall of the first sealing ring 90 is evenly distributed with a plurality of inwardly extending U-shaped protrusions 14. The opening of the U-shaped protrusions 14 faces the side of the first circular baffle 9. The inner side of the U-shaped protrusions 14 forms a mounting groove. In this embodiment, there are four U-shaped protrusions 14. Each U-shaped protrusion 14 includes an L-shaped protrusion 140 and a metal sheet 141. The metal sheet 141 is disposed at one end of the L-shaped protrusion 140. When the second valve core 5 is not assembled, the metal sheet 141 is parallel to the first circular baffle 9.

[0043] like Figure 1 , Figure 4 and Figures 7-9As shown, the second valve core 5 includes a second circular baffle 50, a second sealing ring 13, and a second connecting post 110. In this embodiment, the second circular baffle 50 includes a frustum 11 and a conical cylinder 12 coaxially connected to each other. The second connecting post 110 is a hollow variable-diameter cylinder, which is located in the middle of the large end face of the frustum 11 and extends towards the outlet 19. Its large-diameter section is fitted into the first connecting post 10 with a clearance fit, and its small-diameter section is close to the large end face of the frustum 11. In addition, multiple second through grooves 112 are provided on the outer wall of the large-diameter section of the hollow variable-diameter cylinder to prevent a closed cavity from forming between the hollow variable-diameter cylinder and the first connecting post 10 after the second valve core 5 is opened. In this embodiment, there are two second through grooves 112. The second sealing ring 13 is located on the edge of the conical cylinder 12. The outer wall of the second sealing ring 13 has four first protrusions 130, the same number as the U-shaped protrusions 14, evenly distributed around its circumference. The curvature of each first protrusion 130 is smaller than that between adjacent U-shaped protrusions 14. After the first protrusion 130 is rotated and inserted into the L-shaped protrusion 140, the metal sheet 141 is bent to achieve circumferential and axial positioning of the first protrusion 130. The outer wall of the first protrusion 130 is clearance-fitted with the inner wall of the first sealing ring 90. A second protrusion 131 is provided on the end face of the second sealing ring 13 near the inlet 18. The second protrusion 131 and the fourth protrusion 23 form a second sealing structure. The end face of the second sealing ring 13 near the first circular baffle 9 is used to contact and limit the second valve core 5 after it is opened. Figure 3 As shown, a second limiting groove 111 corresponding to the first limiting groove 15 is provided on the large end face of the frustum 11 along the outer periphery of the small diameter section of the hollow variable-diameter cylinder. The second elastic member 6 is fitted onto the outside of the first connecting post 10. The two ends of the second elastic member 6 are respectively located in the first limiting groove 15 and the second limiting groove 111, and respectively abut against the first circular baffle 9 and the large end face of the frustum 11, to maintain the second sealing structure in a normally closed state. Figure 1 and Figure 8 As shown, the small end of the frustum 11 is provided with multiple mounting slots 113 for embedding external tooling, facilitating the insertion of the second valve core 5 into the first valve core 7. In this embodiment, there are four mounting slots 113. The end face of the second sealing ring 13 near the valve core cylinder 8 is provided with multiple first through slots 132 to prevent the formation of a closed cavity between the second valve core 5 and the first circular baffle 9 after the second valve core 5 is opened. It should be noted that in this embodiment, the frustum 11, the conical cylinder 12, and the second sealing ring 13 are an integral structure, the valve core cylinder 8, the first circular baffle 9, and the first sealing ring 90 are also an integral structure, and the first elastic element 3 and the second elastic element 6 are both springs.

[0044] The assembly process of the aforementioned check valve with a bidirectional limiting integral dual-valve core structure is as follows:

[0045] First, install an external tooling at the threaded hole inside the valve core cylinder 8 to fix the first valve core 7. Then, fit the second elastic member 6 onto the outside of the first connecting post 10 of the first valve core 7, with one end of the second elastic member 6 located in the first limiting groove 15. Next, offset the first boss 130 of the second valve core 5 and the L-shaped protrusion 140 of the first valve core 7 circumferentially, and position the other end of the second elastic member 6 in the second limiting groove 111. Then, press down and rotate the second valve core 5 clockwise to engage the first boss 130 and align the shaft. The first valve core 7 is bent at the L-shaped protrusion 140, preventing the second valve core 5 from rotating relative to the first valve core 7. The first valve core 7 and the second valve core 5 are then assembled. The external tooling is removed. At this point, the first boss 130 of the second valve core 5 is limited by the elastic force of the second elastic member 6 to the U-shaped protrusion 14 formed by the L-shaped protrusion 140 and the metal sheet 141. The end face of the second boss 131 is not on the same plane as the end face of the first sealing ring 90. The double valve core assembly 2 is then assembled. Next, the double valve core assembly 2 is installed from the right into the inlet housing 17 to form a double seal. The first elastic member 3 is fitted onto the outside of the valve core cylinder 8. The base 4 presses against the first elastic member 3, and the base 4 is installed between one end face of the outlet housing 16 and the second step 21. The outlet housing 16 and the inlet housing 17 are threaded together and welded at the rightmost connection point, completing the assembly of the one-way valve. At this point, the end face of the second boss 131 is on the same plane as the end face of the first sealing ring 90.

[0046] The working process of the check valve with the bidirectional limiting integral dual-valve core structure described above is as follows:

[0047] like Figure 1 As shown, the first valve core 7 and the second valve core 5 remain closed under the spring force of the first elastic element 3 and the second elastic element 6, as... Figure 2 As shown, when the pressure at inlet 18 is high, the first valve core 7 and the second valve core 5 open, and the medium flows out of outlet 19 through the inner cavity of inlet housing 17, the inner cavity of outlet housing 16 and base 4 in sequence. When the pressure at inlet 18 is lower than the pressure required for the first valve core 7 and the second valve core 5 to open, the first valve core 7 and the second valve core 5 close.

[0048] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A one-way valve employing a bidirectional limiting integral dual-valve-core structure, comprising a housing (1), a base (4), a first elastic element (3), and a valve core assembly; wherein the valve core assembly, the first elastic element (3), and the base (4) are disposed within the housing (1); wherein the housing (1) is provided with an inlet (18) and an outlet (19); characterized in that: The valve core assembly is a dual valve core assembly (2); the dual valve core assembly (2) includes a first valve core (7), a second valve core (5) and a second elastic element (6); The first valve core (7) includes a valve core cylinder (8), a first circular baffle (9) disposed at one end of the valve core cylinder (8) near the inlet (18), a first sealing ring (90) disposed on the edge of the first circular baffle (9) and facing the inlet (18), and a first connecting post (10) disposed at the center of the first circular baffle (9) and extending toward the inlet (18); the first sealing ring (90) and the housing (1) form a first sealing structure in the inlet (18); the valve core cylinder (8) is slidably fitted with the base (4); The second valve core (5) includes a second circular baffle (50), a second sealing ring (13) disposed on the edge of the second circular baffle (50), and a second connecting post (110) disposed in the middle of the second circular baffle (50) and extending toward the outlet (19); the second sealing ring (13) and the housing (1) form a second sealing structure in the inlet (18); the second connecting post (110) is fitted into the first connecting post (10) in a clearance fit manner; The first elastic element (3) is fitted on the outside of the valve core cylinder (8), and its two ends abut against the first circular baffle (9) and the base (4) respectively, in order to maintain the first sealing structure in a normally closed state; The second elastic element (6) is fitted on the outside of the first connecting post (10), and its two ends abut against the second circular baffle (50) and the first circular baffle (9) respectively, to maintain the second sealing structure in a normally closed state; The first sealing ring (90) has a circumferential groove on its inner side, and the second sealing ring (13) is fitted into the groove on the inner side of the first sealing ring (90) and can move axially within the groove. The inner wall of the first sealing ring (90) is evenly distributed with a plurality of inwardly extending U-shaped protrusions (14), the openings of the U-shaped protrusions (14) facing the side of the first circular baffle (9), and the inner side of the U-shaped protrusions (14) forms the mounting groove; the outer wall of the second sealing ring (13) is evenly distributed with a number of first bosses (130) that are the same as the number of U-shaped protrusions (14) and extend outward; the arc of the first bosses (130) is smaller than the arc between adjacent U-shaped protrusions (14); the first bosses (130) are located between the U-shaped protrusions (14) and the first circular baffle (9) and can move axially; the outer wall of the first bosses (130) is in clearance fit with the inner wall of the first sealing ring (90); The second sealing ring (13) has a second boss (131) on the end face near the inlet (18), and the second boss (131) and the housing (1) form the second sealing structure inside the inlet (18); The U-shaped protrusion (14) includes an L-shaped protrusion (140) and a metal sheet (141); the metal sheet (141) is disposed at one end of the L-shaped protrusion (140).

2. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 1, characterized in that: The housing (1) includes an inlet housing (17) and an outlet housing (16) screwed together; the inlet housing (17) is provided with a first step (20) and a second step (21); the first step (20) is provided with a third boss (22) and a fourth boss (23); the first sealing ring (90) and the third boss (22) constitute the first sealing structure; the second boss (131) and the fourth boss (23) constitute the second sealing structure; The base (4) is installed between one end face of the outlet housing (16) and the second step (21).

3. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 2, characterized in that: The second circular baffle (50) includes a frustum (11) and a conical cylinder (12) that are coaxially connected to each other; the second connecting column (110) is a hollow variable diameter cylinder; the hollow variable diameter cylinder is located in the middle of the large end face of the frustum (11), and its large diameter section is fitted into the first connecting column (10) in a clearance fit manner, while the small diameter section is close to the large end face of the frustum (11); the second sealing ring (13) is located on the edge of the conical cylinder (12); the two ends of the second elastic element (6) abut against the large end face of the frustum (11) and the first circular baffle (9) respectively.

4. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 3, characterized in that: The first circular baffle (9) is provided with a first limiting groove (15) along the outer periphery of the first connecting post (10); the large end face of the frustum (11) is provided with a second limiting groove (111) corresponding to the first limiting groove (15) along the outer periphery of the small diameter section of the second connecting post (110); the two ends of the second elastic member (6) are respectively located in the first limiting groove (15) and the second limiting groove (111).

5. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 4, characterized in that: The valve core cylinder (8) is provided with multiple through holes (80) for the first valve core (7) to communicate with the outside world to balance the pressure after it is opened; the inner cavity of the valve core cylinder (8) near the inlet (18) is provided with a threaded hole for the first valve core (7) to be easily fixed by external tooling during assembly; the second sealing ring (13) near the end face of the valve core cylinder (8) is provided with multiple first through grooves (132) to prevent the second valve core (5) from forming a closed cavity between itself and the first circular baffle (9) after it is opened; the outer wall of the large diameter section of the second connecting column (110) is provided with multiple second through grooves (112) to prevent the second connecting column (110) from forming a closed cavity between itself and the first connecting column (10) after the second valve core (5) is opened.

6. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 5, characterized in that: The small end of the frustum (11) is provided with multiple mounting slots (113) for embedding external tooling, which facilitates the installation of the second valve core (5) and the first valve core (7).

7. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 6, characterized in that: The frustum (11), the conical cylinder (12), and the second sealing ring (13) are an integral structure; the valve core cylinder (8), the first circular baffle (9), and the first sealing ring (90) are an integral structure.

8. The one-way valve with a bidirectional limiting integral double valve core structure according to claim 7, characterized in that: The inlet housing (17) is welded to the outlet housing (16) at the end facing the outlet (19); Both the first elastic element (3) and the second elastic element (6) are springs.

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