Swing check valve with pressure reduction function

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a swing check valve with a pressure reduction function, which comprises a valve body and a valve clack, and the valve clack is rotatably connected with the valve body and is used for opening and closing a valve seat opening. A valve clack opening degree adjusting device is arranged in the valve body and comprises a piston cylinder, a piston, an adjusting rod and an elastic piece, the piston cylinder is fixed to the valve body, the piston is supported in the piston cylinder through the elastic piece, an inner cavity of the piston cylinder is divided into a pressure cavity and a pressure relief cavity by the piston, the pressure cavity is communicated with an inner cavity of the valve body, and the pressure relief cavity is communicated with the outside atmosphere; the adjusting rod is connected with the piston, extends out of the piston cylinder and is used for abutting against and positioning the valve clack in the open state; when the fluid pressure is larger than the threshold value, the fluid pressure pushes the piston and the adjusting rod to move close to the valve clack so as to adjust the opening degree of the valve clack. When the fluid pressure is smaller than the threshold value, the elastic piece pushes the piston and the adjusting rod to move away from the valve clack so as to cancel limitation on the opening degree of the valve clack. The swing check valve has the effect of integrating the functions of check, pressure reduction and shock absorption.

Description

Technical Field

[0001] This application belongs to the technical field of valves, and more specifically, relates to a swing check valve with a pressure reducing function. Background Art

[0002] A swing check valve, also known as a one-way valve or a non-return valve, has a valve flap inside its valve body that can rotate and open or close on its own relying on the pressure formed by the fluid, so as to prevent the fluid in the pipeline system from flowing back.

[0003] Currently, due to the complex and changeable actual application states of pipeline systems, in situations such as when a water pump starts or a valve is quickly closed, the pressure in the pipeline will change sharply, causing pressure fluctuations. And because the valve flap of a swing check valve is sensitive to pressure, the valve flap is prone to repeatedly hitting the valve body under pressure fluctuations, resulting in noise and affecting the service life. In addition, when the pressure fluctuation is large, the excessive pressure is also likely to damage the downstream pipeline and equipment of the swing check valve, affecting the stability of the pipeline system. Therefore, improvement is urgently needed. Summary of the Utility Model

[0004] In view of the defects or improvement requirements of the prior art, this application provides a swing check valve with a pressure reducing function, aiming to improve the problems that the valve flap of the swing check valve is prone to repeatedly hitting the valve body under pressure fluctuations, and the excessive pressure is likely to damage the downstream pipeline and equipment of the swing check valve.

[0005] A swing check valve with a pressure reducing function provided by this application specifically includes a valve body and a valve flap. The valve flap is rotatably connected to the valve body and is used to open and close the valve seat opening of the valve body.

[0006] A valve flap opening adjustment device is arranged in the valve body. The valve flap opening adjustment device includes a piston cylinder, a piston, an adjustment rod, and an elastic member. The piston cylinder is fixed to the valve body, and the piston is elastically supported in the piston cylinder by the elastic member, where:

[0007] The piston divides the inner cavity of the piston cylinder into a pressure chamber and a pressure relief chamber. The pressure chamber is communicated with the inner cavity of the valve body, while the pressure relief chamber is communicated with the outside atmosphere.

[0008] The adjustment rod is connected to the piston, and the adjustment rod extends through the piston cylinder along the pressure relief chamber for the valve flap in the open state to abut and be positioned.

[0009] The pressure exerted by the fluid in the pressure chamber on the piston is in the opposite direction to the elastic force exerted by the elastic member on the piston. When the fluid pressure is greater than the threshold value, the fluid pressure can push the piston and the adjustment rod to move closer to the valve flap to adjust the valve flap opening; when the fluid pressure is less than the threshold value, the elastic member can push the piston and the adjustment rod to move away from the valve flap to cancel the restriction on the valve flap opening.

[0010] Through the above technical solutions conceived in this application, compared with the prior art, the valve flap opening adjustment device of this swing check valve can automatically adjust the opening of the valve flap according to the fluid pressure inside the valve, thereby restricting the maximum pressure at the outlet of the valve body and ensuring stable pressure at the outlet, avoiding damage to pipelines and equipment caused by excessive pressure behind the valve; also, therefore, after the valve flap opening adjustment device automatically adjusts the opening of the valve flap according to the fluid pressure inside the valve, the fluid velocity at the outlet of the valve body is smoothly adjusted and controlled, enabling it to be supplied to downstream pipelines and equipment within a relatively constant and acceptable range, ensuring the stable and normal operation of downstream pipelines and equipment.

[0011] In addition, under the opening adjustment of the valve flap opening adjustment device, the valve flap, adjusting rod, and piston can cooperate in displacement under pressure fluctuations. The movable piston and adjusting rod can buffer the valve flap, making it difficult or even impossible for the valve flap to collide with the valve body, thereby protecting the valve body, making the valve body not prone to vibration, reducing operating noise, extending the service life of the valve body, and making this swing check valve integrate the functions of check valve, pressure reduction, and shock absorption. While increasing the use stability of traditional check valves, it achieves the purpose of multi-purpose use of one valve.

[0012] As a further preference, the elastic member is a pressure spring arranged in the pressure relief cavity. One end of the pressure spring contacts or connects with the inner bottom wall of the pressure relief cavity, and the other end of the pressure spring contacts or connects with the end face of the piston.

[0013] As a further preference, an elastic buffer is installed in the pressure cavity. The elastic buffer is used to absorb the impact kinetic energy transmitted from the valve flap to the piston when the fluid impacts the valve flap.

[0014] As a further preference, a detachable limiting member is installed at the communication port of the pressure cavity. The limiting member abuts against the elastic buffer to limit the elastic buffer within the pressure relief cavity.

[0015] As a further preference, the piston cylinder is connected with a pressure relief pipe. One port of the pressure relief pipe communicates with the pressure relief cavity, and the other port communicates with the atmosphere outside the valve body.

[0016] As a further preference, the valve flap opening adjustment device further includes a stop seat. The stop seat is rotatably arranged at the outer end of the adjusting rod, and the stop seat has a stop surface for positioning the valve flap.

[0017] As a further preference, a limiting structure is arranged at the outer end of the adjusting rod. The limiting structure is used to limit the rotation range of the stop seat, so that the rotation angle of the stop surface is limited between 5 degrees and 30 degrees.

[0018] As a further preference, the limiting structure includes two groups of limiting rods. The two groups of limiting rods are arranged on both sides of the stop seat, so that the rotatable range of the stop seat is located between the two groups of limiting rods.

[0019] As a further preference, the middle part of the valve body bulges upward to form a valve neck, and the valve flap opening degree adjusting device is connected inside the valve neck.

[0020] As a further preference, a maintenance opening is arranged at the upper end of the valve neck, and a detachable valve cover covers the outer end of the maintenance opening.

[0021] Generally speaking, compared with the prior art through the above technical solutions conceived by the present application, the following technical advantages are mainly presented:

[0022] 1. This swing check valve integrates the functions of check valve, pressure reduction and shock absorption. By arranging a valve flap opening degree adjusting device inside the valve body, the opening degree of the valve flap can be automatically adjusted according to the fluid pressure inside the valve, so as to maintain the pressure at the outlet end of the valve body within a stable range, avoiding damage to pipelines and equipment caused by excessive pressure behind the valve; at the same time, it can also buffer the valve flap under pressure fluctuations, significantly prolong the service life of the swing check valve, and reduce operation vibration and noise.

[0023] 2. During the use of the pipeline system, when a strong fluid impact occurs, the valve flap will first come into contact with the stop baffle, and then the stop baffle drives the piston and the buffer spring to absorb the impact kinetic energy, avoiding the impact between the valve flap and the valve body during the opening process, thereby protecting the valve body. Description of the Drawings

[0024] Figure 1 is a cross-sectional view of a swing check valve with a pressure reduction function provided by an embodiment of the present application;

[0025] Figure 2 is a cross-sectional view of the valve flap opening degree adjusting device provided by an embodiment of the present application;

[0026] Figure 3 is an exploded view of the valve flap opening degree adjusting device provided by an embodiment of the present application;

[0027] Figure 4 is a schematic connection structure diagram of the adjusting rod and the stop seat provided by an embodiment of the present application.

[0028] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0029] 1. Valve body; 1-1. Valve seat opening; 1-2. Valve neck; 1-3. Valve cover; 2. Valve flap; 3. Piston cylinder; 3-1. Pressure chamber; 3-2. Pressure relief chamber; 4. Piston; 5. Adjusting rod; 6. Elastic member; 7. Pressure relief pipe; 8. Elastic buffer member; 9. Limiting member; 10. Stop seat; 11. Limiting rod. Detailed Embodiments

[0030] In order to make the objectives, technical solutions, and advantages of the present application more clearly understood, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] The following will further describe the present application in conjunction with the attached Figures 1-4 The present application will be further described in detail.

[0032] An embodiment of the present application discloses a swing check valve with a pressure relief function. Referring to Figures 1-2 , the swing check valve with a pressure relief function includes a valve body 1 and a valve flap 2. The valve flap 2 is rotatably connected to the valve body 1 and is used to open and close the valve seat opening 1-1 of the valve body 1. A valve flap opening adjustment device is provided inside the valve body 1. The valve flap opening adjustment device includes a piston cylinder 3, a piston 4, an adjustment rod 5, and an elastic member 6. Among them, the piston cylinder 3 is fixed to the valve body 1, the piston 4 is elastically supported in the piston cylinder 3 through the elastic member 6, and the piston 4 divides the inner cavity of the piston cylinder 3 into a pressure chamber 3-1 and a pressure relief chamber 3-2. The pressure chamber 3-1 is communicated with the inner cavity of the valve body 1, and the pressure relief chamber 3-2 is communicated with the outside atmosphere. The adjustment rod 5 is connected to the piston 4. The adjustment rod 5 extends through the piston cylinder 3 along the pressure relief chamber 3-2 for the valve flap 2 in the open state to abut and be positioned; in addition, the direction of the pressure exerted by the fluid in the pressure chamber 3-1 on the piston 4 is opposite to the direction of the elastic force exerted by the elastic member 6 on the piston 4. When the fluid pressure is greater than the threshold value, the fluid pressure can push the piston 4 and the adjustment rod 5 to move closer to the valve flap 2 to adjust the opening of the valve flap 2; when the fluid pressure is less than the threshold value, the elastic member 6 can push the piston 4 and the adjustment rod 5 to move away from the valve flap 2 to cancel the limitation on the opening of the valve flap 2.

[0033] Under this design, the swing check valve of the present invention can automatically adjust the opening of the valve flap 2 according to the fluid pressure inside the valve, limit the maximum pressure at the outlet of the valve body 1 and ensure the stability of the pressure at the outlet, avoiding damage to the pipeline and equipment caused by excessive pressure behind the valve; at the same time, it can also smoothly adjust and control the flow rate of the fluid so that it can be supplied to the downstream pipeline and equipment within a relatively constant and acceptable range, ensuring the stable and normal operation of the downstream pipeline and equipment.

[0034] In addition, since the opening limit of the valve flap 2 is realized by the piston 4 and the adjustment rod 5, when the fluid impacts the valve flap 2 to open the valve flap 2, the movable piston 4 and the adjustment rod 5 can buffer the valve flap 2, thereby protecting the valve body 1, reducing the noise and vibration during the operation of the swing check valve, and extending the service life of the swing check valve. Therefore, under this design, the swing check valve of the present invention integrates the functions of check valve, pressure relief, and shock absorption, achieving the effect of multi-purpose use of one valve while increasing the use stability of the traditional check valve.

[0035] In addition, it should be noted that the threshold value can be selected and set with reference to the pressure range allowed for pipeline operation. Generally speaking, when the fluid pushes the valve flap 2, so that the valve flap 2 forms a resistance limit with the valve flap opening adjustment device at a desired opening angle, and the fluid pressure at the outlet end of the valve body 1 is within the acceptable range of downstream equipment, pipelines and other components, the value of the fluid pressure in the valve body 1 at this time can usually be used as the threshold value.

[0036] Further, such as Figures 1-2 As shown, in this embodiment, a through hole is formed at one end of the piston cylinder 3 facing the valve disc 2, and the through hole is used for the adjustment rod 5 to pass through; and the end of the piston cylinder 3 away from the valve disc 2 is an open communication port, and the communication port is used for the fluid in the valve to apply pressure to the piston 4. Furthermore, in order to ensure the stable sealing of the chamber in the piston cylinder 3, a sealing ring is embedded on the circumferential surface of the piston 4 and the circumferential inner wall of the through hole.

[0037] Furthermore, in order to achieve stable installation of the piston cylinder 3, the piston cylinder 3 is fixedly connected to the inner wall of the valve body 1 through a connecting plate. In order to achieve communication between the pressure relief chamber 3-2 and the outside atmosphere, the piston cylinder 3 is also connected to a pressure relief pipe 7, one end of which is connected to the pressure relief chamber 3-2, and the other end is connected to the atmosphere outside the valve body 1. When the pressure relief pipe 7 is made of a hard material, the pressure relief pipe 7 not only achieves communication between the pressure relief chamber 3-2 and the outside atmosphere, but also can be used as a connecting member to achieve stable connection between the piston cylinder 3 and the pressure relief pipe 7.

[0038] Of course, in some embodiments, one radial end of the piston cylinder 3 can be directly in contact with or combined with the inner wall of the valve body 1. In this case, a pressure relief hole can be opened along the wall thickness direction at the contact or combination portion between the piston cylinder 3 and the valve body 1, so that one end of the pressure relief hole is connected to the outside world, and the other end is connected to the pressure relief chamber 3-2. In this case, there is no need to set a pressure relief pipe 7 between the piston cylinder 3 and the valve body 1; it should be noted that this design needs to ensure that no leakage occurs at the contact or combination portion between the piston cylinder 3 and the valve body 1.

[0039] Furthermore, in this embodiment, the elastic member 6 is a pressure spring arranged in the pressure relief chamber 3-2, one end of the pressure spring contacts or is connected to the inner bottom wall of the pressure relief chamber 3-2, and the other end of the pressure spring contacts or is connected to the end face of the piston 4.

[0040] Of course, in some implementation schemes, the elastic member 6 can also be selected as a structure such as a spring sheet, and it is only necessary that the elastic member 6 can form an elastic support for the piston 4 and ensure that the elastic member 6 does not block the connection between the pressure relief chamber 3-2 and the outside world.

[0041] Further, to reduce the impact of fluid shock on the check valve, an elastic buffer 8 is installed in the pressure chamber 3-1 of the piston cylinder 3. The elastic buffer 8 contacts or connects with the piston 4, and is used to absorb the impact kinetic energy transmitted from the valve flap 2 to the piston 4 when the fluid impacts the valve flap 2.

[0042] In this embodiment, the elastic buffer 8 is preferably a buffer spring, which is detachably installed in the pressure chamber 3-1, and one end of the buffer spring contacts the end face of the piston 4. Of course, in some embodiments, the elastic buffer 8 can also be selected as components such as elastic sheets; of course, the elastic buffer 8 can be directly fixedly installed in the pressure chamber 3-1.

[0043] Further, when the elastic buffer 8 is selected as a buffer spring, to achieve the detachable installation of the buffer spring, a detachable limit member 9 is installed at the communication port of the pressure chamber 3-1. After installing the elastic member 6, the piston 4 and the elastic buffer 8 into the piston cylinder 3, the limit member 9 is installed at the communication port, so that the limit member 9 forms an end face contact with the elastic buffer 8 along the axial direction, thereby restricting components such as the elastic buffer 8 within the piston cylinder 3.

[0044] As a preference, as Figures 2-3 shown, in this embodiment, the limit member 9 is selected as an elastic snap ring, which can be snap-fitted into the annular groove of the communication port. In other embodiments, the limit member 9 can also be a screw-cap with a perforation threadedly assembled at the communication port, or a limit pin inserted at the communication port, etc. It should be noted that after setting the limit member 9, there should be sufficient gaps at the communication port for the fluid in the valve to enter and exit the pressure chamber 3-1 to ensure that the fluid at the pressure chamber 3-1 can exert pressure on the piston 4.

[0045] Further, in some embodiments, the valve flap opening degree adjusting device further includes a stop seat 10. The stop seat 10 is rotatably arranged at the outer end of the adjusting rod 5 through a rotating shaft. The rotation axis of the stop seat 10 is preferably parallel to the rotation axis of the valve flap 2, and the stop seat 10 has a stop surface for positioning the valve flap 2.

[0046] Under this setting, by setting the stop seat 10, the adjusting rod 5 forms an abutting position with the opened valve flap 2 through the stop seat 10. When a strong fluid impact occurs at the inlet end of the valve body 1, the valve flap 2 will first contact the stop seat 10, and then the stop seat 10 drives the piston 4 and the buffer spring to absorb the impact kinetic energy, avoiding the valve flap 2 from colliding with the valve body 1 during the opening process, thereby protecting the valve body 1 and extending the service life of the valve parts.

[0047] Further, in some embodiments, a limit structure is further provided at the outer end of the adjusting rod 5. The limit structure is used to limit the rotation range of the stop seat 10, so that the rotation angle of the stop surface is limited between 5 degrees and 30 degrees.

[0048] In actual production and manufacturing, the rotation angle range can be set to any required value range according to requirements, such as set to 10 degrees - 30 degrees, etc. This design is mainly used to ensure that the stop surface of the stop seat 10 can always face the valve flap 2, so as to ensure that the valve flap 2 can make good contact with the stop surface after rotation.

[0049] Specifically, as Figure 4 shown, in this embodiment, the limiting structure includes two groups of limiting rods 11. Both groups of limiting rods 11 are fixed to the adjusting rod 5, and the two groups of limiting rods 11 are respectively arranged on both sides of the stop seat 10, so that the rotatable range of the stop seat 10 is located between the two groups of limiting rods 11.

[0050] In other embodiments, the limiting rod 11 can also be replaced by a screw. By thread - connecting the rod part of the screw to the adjusting rod 5 and making the head of the screw protrude from the surface of the adjusting rod 5, the rotation range of the stop seat 10 is limited by the head of the screw.

[0051] Furthermore, as Figure 1 shown, in this embodiment, for the convenience of installation and maintenance of the valve flap opening adjusting device, the middle part of the valve body 1 protrudes upward to form a valve neck 1 - 2, and the valve flap opening adjusting device is connected inside the valve neck 1 - 2. And an inspection opening is provided at the upper end of the valve neck 1 - 2, and the outer end of the inspection opening is covered with a detachable valve cover 1 - 3.

[0052] It should be understood that expressions such as "including" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit the existence of one or more additional functions, operations and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component or their combination, but cannot be interpreted as excluding the existence or possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components or their combinations.

[0053] It should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0055] In this application, unless otherwise clearly stipulated and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A swing check valve with pressure reducing function, characterized in that: It comprises a valve body (1) and a valve flap (2), wherein the valve flap (2) is rotatably connected to the valve body (1) and is used to open and close a valve seat opening (1-1) of the valve body (1); A valve flap opening adjustment device is arranged in the valve body (1), and the valve flap opening adjustment device comprises a piston cylinder (3), a piston (4), an adjustment rod (5) and an elastic member (6). The piston cylinder (3) is fixed to the valve body (1), and the piston (4) is elastically supported in the piston cylinder (3) through the elastic member (6), wherein: The piston (4) divides the inner cavity of the piston cylinder (3) into a pressure cavity (3-1) and a pressure relief cavity (3-2); the pressure cavity (3-1) is connected to the inner cavity of the valve body (1), while the pressure relief cavity (3-2) is connected to the outside atmosphere; The regulating rod (5) is connected to the piston (4), and the regulating rod (5) extends through the pressure relief chamber (3-2) and out of the piston cylinder (3) to be used for the valve disc (2) in the open state to abut against and position; The direction of the pressure exerted by the fluid in the pressure chamber (3-1) on the piston (4) is opposite to the direction of the elastic force exerted by the elastic member (6) on the piston (4); when the fluid pressure is greater than a threshold value, the fluid pressure can push the piston (4) and the regulating rod (5) to move closer to the valve flap (2) to adjust the opening of the valve flap (2); when the fluid pressure is less than the threshold value, the elastic member (6) can push the piston (4) and the regulating rod (5) to move away from the valve flap (2) to cancel the restriction on the opening of the valve flap (2).

2. The swing check valve with pressure reducing function according to claim 1, characterized in that: The elastic member (6) is a pressure spring arranged in the pressure relief chamber (3-2), one end of the pressure spring is in contact with or connected to the inner bottom wall of the pressure relief chamber (3-2), and the other end of the pressure spring is in contact with or connected to the end surface of the piston (4).

3. The swing check valve with pressure reducing function according to claim 1, characterized in that: An elastic buffer (8) is installed in the pressure chamber (3-1), and the elastic buffer (8) is used to absorb the impact kinetic energy transmitted from the valve disc (2) to the piston (4) when the fluid impacts the valve disc (2).

4. The swing check valve with pressure reducing function according to claim 3, characterized in that: A detachable limiting member (9) is installed at the communication port of the pressure chamber (3-1), and the limiting member (9) abuts against the elastic buffer member (8) to limit the elastic buffer member (8) within the pressure relief chamber (3-2).

5. The swing check valve with pressure reducing function according to claim 1, characterized in that: The piston cylinder (3) is connected to a pressure relief pipe (7), one end of the pressure relief pipe (7) is in communication with the pressure relief chamber (3-2), and the other end of the pressure relief pipe (7) is in communication with the atmosphere outside the valve body (1).

6. The swing check valve with pressure reducing function according to any one of claims 1 to 5, characterized in that: The valve flap opening adjustment device also includes a stop seat (10), which is rotatably arranged on the outer end of the adjustment rod (5), and has a stop surface for positioning the valve flap (2).

7. The swing check valve with pressure reducing function according to claim 6, characterized in that: The outer end of the adjusting rod (5) is provided with a limiting structure, and the limiting structure is used to limit the rotation range of the stop seat (10), so that the rotation angle of the stop surface is limited to between 5 degrees and 30 degrees.

8. The swing check valve with pressure reducing function according to claim 7, characterized in that: The limiting structure comprises two groups of limiting rods (11), which are arranged on both sides of the stop seat (10) so that the rotatable range of the stop seat (10) is located between the two groups of limiting rods (11).

9. The swing check valve with pressure reducing function according to any one of claims 1 to 5, characterized in that: The middle part of the valve body (1) protrudes upwards and forms a valve neck (1-2), and the valve flap opening adjustment device is connected inside the valve neck (1-2).

10. The swing check valve with pressure reducing function according to claim 9, characterized in that: An inspection port is provided at the upper end of the valve neck (1-2), and a detachable valve cover (1-3) is provided on the outer end of the inspection port.

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