High-pressure large-drift-diameter one-way valve

Abstract

The utility model discloses a high-pressure large-drift-diameter one-way valve which solves the problem that in the prior art, when a one-way valve is closed, a spring is impacted, and the service life of the spring is affected. The valve comprises a valve seat, a valve cover is connected to the valve seat, a valve element located in the valve seat is connected to the valve cover in a sliding mode, a reset spring is arranged between the valve cover and the valve element, and a buffering drainage piece matched with the reset spring is further arranged on the valve cover. The one-way valve has the functions of reverse cut-off and forward conduction. When the pressure of an inlet medium is gradually increased until the spring force is overcome, the valve element is jacked open, the one-way valve is opened, the pressure of the medium is reduced, the spring enables the valve element to press the valve seat tightly, reverse reliable sealing is achieved, and in the process, the medium enters the valve seat from the valve deck to impact the buffering drainage piece, the reset spring is protected, and the phenomenon that the use function of the reset spring is affected by medium backflow is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to a high-pressure and large-diameter one-way valve. Background Art

[0002] A one-way valve is a device that allows fluid to flow only through the inlet, but prevents the medium from flowing back through the outlet. It is commonly known as a one-way valve. Also known as a check valve or non-return valve, a one-way valve is used in hydraulic systems to prevent reverse flow of oil, or in pneumatic systems to prevent reverse flow of compressed air. Typically, a one-way valve consists of a housing, a valve seat, and a valve core. Both the valve seat and valve core are located within the housing, and the valve core uses its own weight to block the valve opening on the valve seat. However, existing valve cores block the valve opening on the valve seat using their own weight or a spring. When a spring is used to push the valve core to block the valve opening, backflow of the medium can easily impact the spring, shortening its service life.

[0003] In the prior art, Chinese utility model patent publication number CN206694601U, published on December 1, 2017, discloses a one-way valve and one-way valve assembly for a high-pressure dual-hose diaphragm pump. The one-way valve has a bonnet with a flow hole communicating with the inner cavity of the valve cylinder; the valve seat is a stepped structure; the portion of the valve seat's larger end near the smaller end is provided with a long chamfer; the portion of the valve seat's larger end away from the smaller end is gap-fitted with the inner wall of the valve cylinder; the sealing surface of the sealing gasket extends beyond the contact surface between the spherical sealing segment and the conical cavity. This creates a primary seal with the conical cavity of the valve seat, cushioning the impact force of the valve core against the valve seat. Meanwhile, the spherical sealing segment of the valve core makes linear contact with the conical cavity of the valve seat, forming a secondary seal and limiting the downward movement of the valve core. Although this one-way valve incorporates a buffer, the buffer is intended only to protect the valve seat. In actual use, there is still the problem of media backflow directly impacting the spring, shortening its life. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a high-pressure large-diameter one-way valve, which solves the problem in the prior art that the one-way valve impacts the spring when closed, thereby affecting the spring life.

[0005] The technical solution of the utility model is achieved as follows: a high-pressure large-diameter one-way valve includes a valve seat, a valve cover is connected to the valve seat, a valve core located in the valve seat is slidably connected to the valve cover, a return spring is arranged between the valve cover and the valve core, and the valve cover is also provided with a buffer drainage member cooperating with the return spring.

[0006] Further preferably, a sealing ring 1 is provided on the inlet end surface of the valve seat, and a sealing ring 2 is provided on the outlet end surface of the valve seat, and the sealing ring 2 is located at the connection between the valve seat and the valve cover.

[0007] Further preferably, the valve seat is provided with an inlet portion, a buffer portion and an installation portion in sequence, a sealing cone surface 1 is provided at the tail of the inlet portion, a transition fillet 1 is provided between the sealing cone surface 1 and the buffer portion, and a transition fillet 2 is provided between the buffer portion and the installation portion.

[0008] Further preferably, the valve cover is provided with a mounting plate matched with the mounting portion, and the mounting plate is provided with outlet holes evenly distributed in the circumferential direction.

[0009] Further preferably, a track hole is provided in the middle of the valve cover, the track hole passes through the mounting plate, and an annular groove matching the track hole is provided on the mounting plate.

[0010] Further preferably, the buffer guide member includes a limiting ring, a convex ring is installed on the inner ring of the limiting ring, the convex ring is arranged on the valve cover, and a transition chamfer is provided between the convex ring and the valve cover.

[0011] Further preferably, the limiting ring is a conical ring, and the conical surface of the conical ring faces the outlet hole.

[0012] Further preferably, the limiting ring, the convex ring and the valve seat are an integrally formed structure.

[0013] Further preferably, the valve core includes a mounting post that cooperates with the return spring, and a sliding post that slides with the track hole is provided on the mounting post.

[0014] Further preferably, one end of the valve core is provided with a sealing cone surface 2 that cooperates with the sealing cone surface 1, and the valve core is provided with an impact-resistant cone surface. The sealing cone surface and the impact-resistant cone surface are smoothly transitioned and connected, and the impact-resistant cone surface faces the inlet part.

[0015] The beneficial effects of the present invention are as follows: the one-way valve of the present invention has the functions of reverse cutoff and forward conduction. When the inlet medium pressure gradually increases until it overcomes the spring force, the valve core is pushed open, the one-way valve opens, the medium pressure decreases, and the spring causes the valve core to press the valve seat to achieve reverse reliable sealing. During this process, the medium enters the valve seat from the valve cover, impacting the buffer guide member, protecting the reset spring, and preventing the medium from backflowing and affecting the use function of the reset spring. During the entire process, the reset spring functions stably and cooperates with the valve core to slide in the valve cover to achieve conduction and cutoff functions. When the one-way valve is used, it is installed in the system by pressing the two end faces of the valve body. Sealing rings are provided on the inlet end face and the outlet end face of the valve seat. The two sealing rings are used to achieve end face sealing to prevent external leakage. The valve body and the valve cover are fixedly connected by welding, and the valve core and the valve cover are slidably connected. The spring moves between the valve core and the valve cover, providing spring force so that the conical surface of the valve core presses the valve body to achieve hard sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a structural diagram of the valve seat of the utility model;

[0019] Figure 3 This is a schematic structural diagram of the valve cover of the utility model;

[0020] Figure 4 This is a top view of the valve cover of the utility model;

[0021] Figure 5 This is a structural diagram of the valve core of the utility model.

[0022] In the figure: 1-valve cover, 11-annular groove, 12-transition chamfer, 13-convex ring, 14-limiting ring, 15-outlet hole, 16-mounting plate, 17-track hole, 2-valve core, 21-impact-resistant cone surface, 22-sealing cone surface 1, 23-mounting column, 24-sliding column, 3-valve seat, 31-sealing cone surface 2, 32-transition fillet 1, 33-transition fillet 2, 4-reset spring, 5-sealing ring 1, 6-sealing ring 2. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figures 1 to 5As shown, Example 1 is a high-pressure, large-diameter, one-way valve, comprising a valve seat 3, a valve cover 1 being connected to the valve seat 3, a valve core 2 being slidably connected to the valve cover 1 and located in the valve seat 3, a reset spring 4 being provided between the valve cover 1 and the valve core 2, and a buffer guide member cooperating with the reset spring 4 being provided on the valve cover 1. The one-way valve has the functions of reverse cutoff and forward conduction. When the inlet medium pressure gradually increases until the spring force is overcome, the valve core 2 is pushed open, the one-way valve opens, the medium pressure decreases, and the spring causes the valve core 2 to press against the valve seat 3 to achieve a reliable reverse seal. During this process, the medium enters the valve seat 3 from the valve cover 1, impacting the buffer guide member, protecting the reset spring 4, and preventing the backflow of the medium from affecting the use function of the reset spring 4. Throughout the process, the reset spring 4 functions stably, cooperating with the valve core 2 to slide in the valve cover 1 to achieve conduction and cutoff functions.

[0025] In this embodiment, a sealing ring 1 5 is provided on the inlet end face of the valve seat 3, and a sealing ring 2 6 is provided on the outlet end face of the valve seat 3. The sealing ring 2 6 is located at the connection between the valve seat 3 and the valve cover 1. Both the sealing ring 1 5 and the sealing ring 2 6 are O-rings. During use, they are installed in the system by pressing the two end faces of the valve body. O-rings are provided on both the inlet and outlet end faces of the valve seat 3. The two O-rings achieve end-face sealing to prevent external leakage. The valve seat 3 and the valve cover 1 are fixedly connected by welding, and the valve core 2 is slidably connected to the valve cover 1. A spring moves between the valve core 2 and the valve cover 1, providing spring force that causes the valve core 2 to press against the valve seat 3, achieving a hard seal.

[0026] like Figures 1 to 5 As shown, Example 2 is a high-pressure, large-diameter one-way valve. The valve seat 3 is sequentially provided with an inlet, a buffer, and a mounting portion. The inlet, buffer, and mounting portions are all located within the flow channel of the valve seat 3. A sealing conical surface 1 22 is provided at the tail of the inlet. A transition radius 1 32 is provided between the sealing conical surface 1 22 and the buffer, and a transition radius 2 33 is provided between the buffer and the mounting portion. Transition radius 1 32 is preferably R8, and transition radius 2 33 is preferably R6, optimizing the valve body flow channel. The transition radius is increased to R8 near the inlet, and the transition radius is designed to R6 at the outlet. The various curves within the valve body are smoothly connected to reduce fluid resistance.

[0027] In this embodiment, the valve cover 1 is provided with a mounting plate 16 that mates with the mounting portion. The mounting plate 16 is provided with outlet holes 15 evenly distributed around the circumference. The mounting plate 16 and the valve cover 1 are integrally formed. Six outlet holes 15 are evenly distributed along the axis, extending into the valve cover 1. A track hole 17 is provided in the center of the valve cover 1, extending through the mounting plate 16. An annular groove 11 is provided on the mounting plate 16 that mates with the track hole 17. The one-way valve operates at high pressures. To ensure both reliability and ease of testing, the mating section of the mounting plate 16 on the valve cover 1 and the mating section of the mounting portion on the valve seat 3 are fitted with an interference fit. After the one-way valve passes testing, they are welded and secured. The valve body and valve cover 1 are made of 05Cr17Ni4Cu4Nb, and the valve core 2 is made of 9Cr18, which can meet high-pressure requirements. The connection between the valve seat 3 and the valve cover 1 is provided with a groove that mates with the sealing ring 2 6 to enhance sealing.

[0028] In this embodiment, the buffer and drainage member comprises a retaining ring 14, with a raised ring 13 mounted on its inner ring. The raised ring 13 is positioned on the end of the valve cover 1 near the mounting plate 16. A transition chamfer 12 is provided between the raised ring 13 and the valve cover 1, with a 45° inclination. The retaining ring 14 is conical, with its tapered surface facing the outlet opening 15. The conical ring can also be used to guide the medium. The retaining ring 14, raised ring 13, and valve seat 3 are integrally formed. One end of the return spring 4 is sleeved on the raised ring 13, and the retaining ring 14 serves to restrain and protect the return spring 4. A 45° guide chamfer is provided at the end where the valve cover 1 meets the spring, and the mating diameter is increased at the end to ensure flexible spring movement and reliable spring guidance. A 60° transition chamfer is provided at the rear end of the valve cover 1, near the outlet, to reduce impact. The subsequent short cylindrical section serves as the drainage section for the outlet opening 15. The valve cover 1 is provided with at least six outlet openings 15.

[0029] In this embodiment, the valve core 2 includes a mounting post 23 that mates with the return spring 4. The diameter of the mounting post 23 is the same as that of the raised ring 13, ensuring that the return spring 4 does not rub against the valve cover 1 during expansion and contraction. A sliding post 24 is mounted on the mounting post 23, which slidably engages with the track hole 17. The valve cover 1 and valve core 2 are connected by a sliding connection, with a single-side clearance between the two ranging from 0.008 to 0.03, ensuring smooth movement while reducing vibration. A small step is provided at the inlet where the valve cover 1 and valve core 2 mate to cushion the direct impact of the valve core 2 on the valve cover 1. One end of the valve core 2 is provided with a sealing cone 2 31 that mates with the sealing cone 1 22. The valve core 2 is also provided with an impact-resistant cone 21, which smoothly transitions to the impact-resistant cone 21, with the impact-resistant cone 21 facing the inlet. The valve core 2 is designed with a 60° sealing cone angle, which is 3° smaller than the sealing cone angle of the valve seat 3, ensuring sealing reliability within the check valve and reducing inlet vortexes. The inclination of the impact-resistant cone 21 is preferably 150°. The valve core 2 is designed with a large taper angle of 150° on the side close to the valve inlet to facilitate guidance, increase the direct contact area with the medium, and make the impact of the medium force on the valve core 2 more uniform.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-pressure, large-diameter one-way valve, characterized by: The invention comprises a valve seat (3), a valve cover (1) connected to the valve seat (3), a valve core (2) located in the valve seat (3) being slidably connected to the valve cover (1), a return spring (4) being arranged between the valve cover (1) and the valve core (2), and a buffer guide member cooperating with the return spring (4) being further arranged on the valve cover (1); a mounting plate (16) cooperating with a mounting portion inside the valve seat (3) being provided on the valve cover (1), and outlet holes (15) being uniformly distributed in the circumferential direction being provided on the mounting plate (16).

2. The high-pressure, large-diameter one-way valve according to claim 1, characterized in that: A sealing ring 1 (5) is provided on the inlet end surface of the valve seat (3), and a sealing ring 2 (6) is provided on the outlet end surface of the valve seat (3). The sealing ring 2 (6) is located at the connection between the valve seat (3) and the valve cover (1).

3. The high-pressure, large-diameter one-way valve according to claim 1 or 2, characterized in that: The valve seat (3) is provided with an inlet portion, a buffer portion and a mounting portion in sequence therein, a sealing cone surface 1 (22) is provided at the tail of the inlet portion, a transition fillet 1 (32) is provided between the sealing cone surface 1 (22) and the buffer portion, and a transition fillet 2 (33) is provided between the buffer portion and the mounting portion.

4. The high-pressure, large-diameter one-way valve according to claim 3, characterized in that: A track hole (17) is provided in the middle of the valve cover (1), the track hole (17) passes through the mounting plate (16), and an annular groove (11) is provided on the mounting plate (16) to match the track hole (17).

5. The high-pressure, large-diameter one-way valve according to claim 4, characterized in that: The buffer guide member comprises a limiting ring (14), a convex ring (13) is mounted on the inner ring of the limiting ring (14), the convex ring (13) is arranged on the valve cover (1), and a transition chamfer (12) is provided between the convex ring (13) and the valve cover (1).

6. The high-pressure, large-diameter one-way valve according to claim 5, characterized in that: The limiting ring (14) is a conical ring, and the conical surface of the conical ring faces the outlet hole (15).

7. The high-pressure, large-diameter one-way valve according to claim 6, characterized in that: The limiting ring (14), the convex ring (13) and the valve seat (3) are an integrally formed structure.

8. The high-pressure, large-diameter one-way valve according to claim 6 or 7, characterized in that: The valve core (2) includes a mounting column (23) that cooperates with the return spring (4), and a sliding column (24) that slidably cooperates with the track hole (17) is provided on the mounting column (23).

9. The high-pressure, large-diameter one-way valve according to claim 8, characterized in that: One end of the valve core (2) is provided with a second sealing cone surface (31) that cooperates with the first sealing cone surface (22). The valve core (2) is provided with an impact-resistant cone surface (21), and the impact-resistant cone surface (21) faces the inlet portion.

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