One-way valve

Abstract

The utility model discloses a one-way valve which solves the problems that in the prior art, a one-way valve is small in opening limitation and poor in reliability. The one-way valve comprises an upper shell and a lower shell which are detachably connected, a supporting frame used for supporting a valve element is arranged in the upper shell, the supporting frame and the upper shell are integrally formed, the fixed end of the valve element is fixed in the upper shell, and the opening and closing end of the valve element is matched with a limiting structure arranged on the inner wall of the lower shell. Compared with the prior art, the one-way valve is a non-self-opening type valve and is not affected by the installation environment, and the valve is installed on a moving or rotating pipeline and cannot be automatically opened; the valve reliability is improved. The supporting frame and the valve element are designed to be V-shaped, and a plate is embedded in the valve element, so that high non-return pressure can be borne; and the shell and the supporting frame are all of a full-bore design, a flow channel is smooth, resistance is small, and abrasion resistance is high.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel boring machine pipeline check, in particular to a one-way valve. Background Art

[0002] When the shield machine is in construction, the pressure in the mud pipeline may change due to instability of the face or damage to the mud pump, which may cause mud backflow and cause an accident. Therefore, valves or devices with check function are generally installed on the pipeline of the shield machine.

[0003] There are many types of one-way valves with common structural forms. For example, a one-way valve disclosed in a Chinese patent with publication number CN220337545U relies on a limiter and outlet water pressure to ensure the one-way flow of liquid, but it must be installed horizontally and cannot adapt to the use of a rotating cutter disc. If a spring is added to its limiter, the opening pressure of the valve core is increased. A one-way valve disclosed in a Chinese patent with publication number CN220185931U can adapt to the rotation of the cutter disc, but the material and structural design of its valve core are destined to be unable to withstand greater pressure (the pressure bearing capacity of the mud shield circulation system is generally 16 bar) and cannot adapt to the wear of small particles in the mud. At the same time, due to its structural design at the inlet, the flow channel in front of the valve core is a non-full-diameter design, which is very easy to generate vortices when high-speed fluid passes through, causing abnormal wear of the valve body. In addition, although the above-mentioned one-way valves all have a check function, they have problems such as harsh installation conditions, small opening limit, poor wear resistance, easy clogging, fast failure of the valve core without limit position, and non-full-diameter. The resulting check failure and turbulence caused by the change of the flow channel of the valve body seriously affect the efficient operation of the circulation system and restrict the construction progress and efficiency. Therefore, it is necessary to design a one-way valve that can withstand pressure, has a small opening pressure, is full-diameter, and has no strict use environment requirements. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a one-way valve, which solves the problems of small opening limit and poor reliability of the one-way valve in the prior art.

[0005] The technical solution of the utility model is implemented as follows: a one-way valve comprises a detachably connected upper shell and a lower shell, wherein a support frame for supporting a valve core is provided in the upper shell, the support frame and the upper shell are integrally formed, the fixed end of the valve core is fixed in the upper shell, and the opening and closing ends of the valve core cooperate with a limiting structure arranged on the inner wall of the lower shell.

[0006] Further preferably, the limiting structure includes limiting grooves symmetrically arranged on the inner wall of the lower shell, and the outer part of the valve core opening and closing end is located in the limiting groove; the limiting groove limits the opening amount of the valve core to avoid the valve core from opening too much and causing failure. The inner cavity of the lower shell is a conical inner cavity flow channel; the slurry flow resistance is reduced to ensure smooth slurry flow.

[0007] Preferably, the width of the limit groove is consistent with the direction of the valve core opening, and the width of the limit groove is equal to the maximum opening amount of the valve core. The setting of the limit groove serves to limit the opening amount of the valve core without affecting the normal opening and closing of the valve core.

[0008] Further preferably, the support frame is integrally cast with the upper shell body, without welds affecting the full-diameter flow channel; the support frame is a full-through cylindrical structure, and one end of the support frame extending into the valve core is a V-shaped sleeve structure, which fits the inner wall of the valve core.

[0009] Further preferably, the junction between the support frame and the inner wall of the upper shell is a ring platform, the valve core is an integral wear-resistant rubber part, the valve core is sleeved on the support frame and connected to the ring platform through a fixing part.

[0010] Further preferably, the valve core includes a cylindrical portion and an opening and closing portion that are integrally formed, the opening and closing portion is a V-shaped structure, and the outer surfaces of the cylindrical portion and the opening and closing portion are both provided with a curtain layer; the fixing part includes a pressure ring, the cylindrical portion is pressed and fixed on the ring platform by the pressure ring, and the pressure ring is connected to the ring platform by a pressure ring bolt; the opening and closing portion is two hinges that can be closed naturally.

[0011] Preferably, a steel plate is embedded in the hinge piece. The hinge piece is an isosceles trapezoidal rubber piece, the long bottom side of the isosceles trapezoidal rubber piece matches the limiting structure; the limiting groove limits the opening and closing of the hinge piece.

[0012] Further preferably, both ends of the upper shell and both ends of the lower shell are respectively provided with an upstream flange and a downstream flange; the downstream flange of the upper shell is matched with the upstream flange of the lower shell and is sealed and connected by fasteners.

[0013] Further preferably, the downstream flange of the upper shell is provided with a limiting ring groove, the upstream flange of the lower shell is provided with a limiting protrusion ring, the limiting protrusion ring cooperates with the limiting ring groove, and a sealing ring is provided between the limiting protrusion ring and the limiting ring groove. Further preferably, the fastener includes a stud and a nut, and a gasket is provided between the nut and the upstream flange and / or the downstream flange.

[0014] The beneficial effects of the utility model are as follows: compared with the prior art, the one-way valve of the utility model is a non-self-starting valve, which is not affected by the installation environment. The valve will not open automatically when installed on a moving or rotating pipeline; the reliability of the valve is improved. The support frame and the valve core are V-shaped and the plate is embedded in the valve core, which can withstand a strong check pressure (back pressure capacity); the shell and the support frame are both full-bore designs, the flow channel is smooth, the resistance is small, and the wear resistance is strong. The upper shell and the lower shell are castings, and the material preparation and processing are relatively convenient, the cost is low, and it has good processing economy; the whole adopts a bolt connection form to avoid the weld from affecting the check performance, which is conducive to reducing the weight of the valve and convenient installation. The inner cavity of the lower shell is a conical inner cavity transition flow channel, which ensures smooth flow of the slurry and reduces resistance and wear. The support frame and the upper shell are cast as a whole, which is a full-bore design. There is no misalignment or weld inside, and the overall life is long. The plate built into the valve core increases the anti-compression capacity of the valve core. The outer side of the valve core is designed with a cord layer to enhance the connectivity between rubbers, prevent the rubber from falling off, and enhance the service life of the valve core. The utility model occupies a small space, has a reasonable production and manufacturing process, has a low cost, has good economic applicability, and effectively solves the problems of harsh installation conditions, poor wear resistance, and poor pressure bearing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a vertical sectional schematic diagram of the utility model.

[0017] Figure 2 It is a horizontal cross-sectional schematic diagram of the utility model.

[0018] Figure 3 It is a schematic diagram of the working principle of the utility model.

[0019] Figure 4 It is an overall axonometric schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 As shown, embodiment 1, a one-way valve, includes an upper shell 1 and a lower shell 2 that are detachably connected. Both the upper shell and the lower shell are castings, and the material preparation and processing are relatively convenient, the cost is low, and it has good processing economy; the overall bolt fastening form is convenient for installation, and it also avoids leakage caused by unreliable welding of the weld. A support frame 10 for supporting the valve core 3 is provided in the upper shell 1. The support frame 10 is integrally formed with the upper shell 1. The support frame is a full-diameter design, there is no misalignment or weld inside, and the overall life is relatively long. The fixed end of the valve core 3 is fixed in the upper shell 1, and the opening and closing ends of the valve core 3 cooperate with the limiting structure provided on the inner wall of the lower shell 2. The limiting structure can limit the opening amount of the opening and closing ends of the valve core 3 to avoid failure caused by excessive opening of the valve core.

[0022] As a preferred solution, Figure 4 As shown, the limiting structure includes a limiting groove 12 symmetrically arranged on the inner wall of the lower shell 2, and the limiting groove 12 and the lower shell 2 have a smooth transition to avoid the generation of eddy currents and abnormal wear of the valve body. The outside of the opening and closing end of the valve core 3 is located in the limiting groove 12; the limiting groove is arranged symmetrically on the left and right, and the two sides of the opening and closing end of the valve core 3 are limited at the same time to ensure the reliability of the limit. The width direction of the limiting groove 12 described in this embodiment is consistent with the opening direction of the valve core 3, and the width of the limiting groove 12 is equal to the maximum opening amount of the valve core 3. The setting of the limiting groove plays a role in limiting the size of the opening amount of the valve core without affecting the normal opening and closing of the valve core. The inner cavity of the lower shell 2 is a conical inner cavity flow channel; the resistance to the flow of slurry is reduced to ensure smooth flow of slurry.

[0023] like Figure 2 As shown, Example 2 is a one-way valve. This example is further optimized on the basis of Example 1. The support frame 10 is integrally cast with the upper shell 1, and there is no weld to affect the full-diameter flow channel. The flow channel is smooth, the resistance is small, and the wear resistance is strong. At the same time, the support frame 10 is a full-through cylindrical structure, and the end of the support frame 10 extending into the valve core 3 is a V-shaped sleeve structure, and the V-shaped sleeve structure fits the inner wall of the valve core 3. When the valve core 3 is in a closed state, the valve core 3 is pressed onto the support frame 10. That is, a wedge-shaped sleeve design is adopted at the junction of the support frame and the valve core, which fully protects the valve core from direct contact with high-speed flowing slurry, prolongs the life of the valve core, and at the same time ensures coaxiality to prevent excessive deviation.

[0024] In this embodiment, as a preferred embodiment, the intersection of the support frame 10 and the inner wall of the upper shell 1 is a ring platform 11, which is convenient for connecting the support frame 10. The valve core 3 is an integral wear-resistant rubber part, that is, the entire material of the valve core 5 is wear-resistant rubber, which improves wear resistance, and has strong toughness and high frequency of use. The valve core 3 is sleeved on the support frame 10 and connected to the ring platform 11 through a fixing part. A curtain layer is designed on the outside of the valve core, and the opening and closing part 3-2 of the valve core 3 is a V-shaped structure. The inner cavity of the valve core is V-shaped. When there is no slurry flowing, the valve core can be closed by relying on the backflow pressure of the outlet slurry. When opening, it only needs to overcome the external pressure to open.

[0025] As a preferred solution, the valve core 3 includes a cylindrical portion 3-1 and an opening and closing portion 3-2 which are integrally formed. The opening and closing portion 3-2 of the valve core 3 is a V-shaped structure, and the inner cavity of the valve core is V-shaped. The outer surfaces of the cylindrical portion 3-1 and the opening and closing portion 3-2 are both provided with a cord layer. The outer surface of the valve core is designed with a cord layer to enhance its sealing and wear resistance. In addition, the connectivity between rubbers is enhanced to prevent the rubber from falling off, thereby enhancing the service life of the valve core. The fixing part includes a pressure ring 4, and the cylindrical portion 3-1 is pressed and fixed on the ring platform 11 through the pressure ring 4. The pressure ring 4 is connected to the ring platform 11 through the pressure ring bolt 5. Under the action of the pressure ring bolt 5, the pressure ring presses the valve core tightly on the ring platform to achieve stable installation with the valve core. The opening and closing portion 3-2 is two hinges that can be closed naturally, forming a duckbill structure. The hinge is embedded with a steel plate 3-3, and a steel plate is built into the inclined hinge of the core body to increase the deformation resistance of the force-bearing surface. Preferably, the hinge piece is an isosceles trapezoidal rubber piece, and the side edge of the long bottom edge of the isosceles trapezoidal rubber piece cooperates with the limiting structure to limit the maximum opening amount of the hinge piece without affecting its normal opening and closing.

[0026] like Figure 3 As shown, embodiment 3 is a one-way valve, wherein both ends of the upper shell 1 and both ends of the lower shell 2 are respectively provided with an upstream flange and a downstream flange; the downstream flange 1-1 of the upper shell 1 cooperates with the upstream flange 2-1 of the lower shell 2 and is sealed and connected by fasteners to achieve rapid disassembly and sealing of the upper and lower shells.

[0027] In order to further improve the sealing performance of the shell connection, the downstream flange 1-1 of the upper shell 1 is provided with a limiting ring groove, and the upstream flange 2-1 of the lower shell 2 is provided with a limiting protruding ring, which cooperates with the limiting ring groove to ensure installation accuracy, and a sealing ring 6 is provided between the limiting protruding ring and the limiting ring groove to improve installation sealing performance. The fastener includes a stud 7 and a nut 8, and a gasket 9 is provided between the nut 8 and the upstream flange 2-1 and / or the downstream flange 1-1.

[0028] The upper and lower shells of the one-way valve of the utility model are connected by studs and nuts; there is a sealing ring between the upper and lower shells. The device is directional during use. The direction of slurry flow is from large to small in the natural state of the valve core. The device is in a closed state in the natural state. No matter how the new check valve is installed or whether it moves with the pipeline, it will not open automatically. The slurry in the pipeline impacts the upstream end of the new check valve, and the valve core opens. With different flow rates and impact forces, the flow area after the valve core is opened is different. After opening, the slurry passes through the device smoothly. The slurry does not flow in the pipeline and has no impact on the valve core. The valve core is in a closed state under its own action. If there is pressurized slurry on the downstream side of the pipeline, the slurry pressure will act on the outer inclined surface of the lower valve core, exerting an extrusion force on the valve core, making the valve core close more tightly and having a better pressure-bearing effect, thereby achieving the function of a check valve.

[0029] The downstream high-pressure slurry releases the pressure on the built-in plate on the bevel of the valve core, and then presses the valve core on the support frame. The support frame directly bears the force to avoid the valve core from being crushed; due to the V-shaped valve core and support frame, the valve core is closed under the action of the downstream high-pressure slurry. At this time, if the cutter head rotates, the pressure on the valve core does not disappear and the valve core remains closed, thereby eliminating the problem of check failure caused by rotation. Due to the limit design of the valve body structure, the valve core will not cause the valve core life to decrease due to excessive opening when it is opened. Since the upper shell is an integrated casting, the problem of non-full-diameter caused by welding in the later stage is avoided. The valve body casting material is carbon steel, medium carbon WCp (WCp / (Co+Cr) composite material coating is sprayed on the surface of Q235 steel), the pressure bearing capacity is up to 20bar (after experiment), and the wear resistance is good. The valve core is made of rubber, which has good wear resistance and the opening pressure is smaller than that of the spring.

[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 substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A one-way valve, characterized in that: The invention comprises an upper shell (1) and a lower shell (2) which are detachably connected, wherein a support frame (10) for supporting a valve core (3) is provided in the upper shell (1), the support frame (10) and the upper shell (1) are integrally formed, the fixed end of the valve core (3) is fixed in the upper shell (1), and the opening and closing end of the valve core (3) cooperates with a limit structure provided on the inner wall of the lower shell (2).

2. The one-way valve according to claim 1, characterized in that: The limiting structure comprises a limiting groove (12) symmetrically arranged on the inner wall of the lower shell (2), and the outside of the opening and closing end of the valve core (3) is located in the limiting groove (12); the inner cavity of the lower shell (2) is a tapered inner cavity flow channel.

3. The one-way valve according to claim 2, characterized in that: The width direction of the limiting groove (12) is consistent with the opening direction of the valve core (3), and the width of the limiting groove (12) is equal to the maximum opening amount of the valve core (3).

4. The one-way valve according to claim 1, characterized in that: The support frame (10) is integrally cast with the upper shell (1); the support frame (10) is a full-through cylindrical structure; one end of the support frame (10) extending into the valve core (3) is a V-shaped sleeve structure; the V-shaped sleeve structure fits the inner wall of the valve core (3).

5. The one-way valve according to claim 4, characterized in that: The junction between the support frame (10) and the inner wall of the upper shell (1) is a ring platform (11), and the valve core (3) is an integral wear-resistant rubber part. The valve core (3) is sleeved on the support frame (10) and connected to the ring platform (11) through a fixing part.

6. The one-way valve according to claim 5, characterized in that: The valve core (3) comprises a cylindrical portion (3-1) and an opening and closing portion (3-2) which are integrally formed, the opening and closing portion (3-2) being of a V-shaped structure, and outer surfaces of the cylindrical portion (3-1) and the opening and closing portion (3-2) are both provided with a cord layer; the fixing member comprises a pressure ring (4), the cylindrical portion (3-1) is pressed and fixed on the ring platform (11) by the pressure ring (4), and the pressure ring (4) is connected to the ring platform (11) by a pressure ring bolt (5).

7. The one-way valve according to claim 6, characterized in that: The opening and closing portion (3-2) is two hinge pieces that can be closed naturally, and a steel plate piece (3-3) is embedded in the hinge piece.

8. The one-way valve according to any one of claims 1 to 7, characterized in that: Both ends of the upper shell (1) and the lower shell (2) are respectively provided with an upstream flange and a downstream flange; the downstream flange (1-1) of the upper shell (1) is matched with the upstream flange (2-1) of the lower shell (2) and is sealed and connected via fasteners.

9. The one-way valve according to claim 8, characterized in that: The downstream flange (1-1) of the upper shell (1) is provided with a limiting ring groove, and the upstream flange (2-1) of the lower shell (2) is provided with a limiting protrusion ring, the limiting protrusion ring cooperates with the limiting ring groove, and a sealing ring (6) is provided between the limiting protrusion ring and the limiting ring groove.

10. The one-way valve according to claim 9, characterized in that: The fastener comprises a stud (7) and a nut (8), and a gasket (9) is provided between the nut (8) and the upstream flange (2-1) and / or the downstream flange (1-1).

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