A gas valve type angle check valve

Abstract

The utility model relates to fluid control valve technical field discloses a kind of gas valve type angle check valve, main body and the anti-return mechanism being set in the inside of main body, anti-return mechanism includes valve seat, valve piece, limiter, spring and limit post, valve seat is fixed in the inside of main body, limit post is fixed in the middle of valve seat, limiter is fixed in the end of limit post away from valve seat, three constitute fixed frame, valve piece is sleeved in the outer periphery of limit post and located between valve seat and limiter, valve piece is slidably connected with limit post, can reciprocate along axial direction to open and close passage, spring is arranged between limiter and valve piece to provide reset thrust force.The utility model uses laminated gas valve structure to replace traditional rocker mechanism, effectively increases the flow area, reduces medium flow rate and noise, and overall structure is simple, processing cost is low, cooperates auxiliary guide design, is convenient for disassembly maintenance, significantly improves sealing reliability.

Description

Technical Field

[0001] This utility model relates to the field of fluid control valve technology, and in particular to a pneumatic valve type angle check valve. Background Technology

[0002] As a key device in industrial pipelines to prevent backflow of media, check valves are widely used in various fluid transportation pipelines. Their main function is to automatically open or close the valve disc by relying on the flow force of the media itself to ensure the safe operation of the pipeline.

[0003] However, existing angle check valve technology generally presents a contradiction between flow efficiency and structural complexity. The internal flow channel design of traditional angle check valves is often limited by the valve disc structure, resulting in a small effective flow area at the inlet. When the medium flows through the valve, the flow velocity increases significantly due to the narrow flow cross-section. This not only causes significant fluid resistance loss and energy consumption, failing to meet current energy conservation and consumption reduction requirements, but also generates significant vibration and noise due to the impact of the high-speed flowing medium. In addition, to ensure sealing performance and actuation sensitivity, existing check valves often adopt complex rocker swing or heavy-duty lifting mechanical structures. These structures require high machining precision, resulting in high manufacturing costs. Furthermore, the internal components are complex, making on-site disassembly and repair extremely difficult in case of failure, making it difficult to meet the modern industrial demand for valves that are low-cost, easy to maintain, and highly energy-efficient.

[0004] Therefore, this utility model proposes a pneumatic valve-type angle check valve to overcome the shortcomings of the prior art. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a pneumatic valve-type angle check valve, which aims to improve the problems of small flow area leading to high medium flow rate, large energy loss and high noise in some existing angle check valves.

[0006] This utility model provides a pneumatic valve type angle check valve, comprising: a main body, and an anti-backflow mechanism disposed inside the main body. The anti-backflow mechanism includes a valve seat, a valve plate, a limiter, a spring, and a limiting post. The valve seat is fixedly connected inside the main body, and the limiting post is fixedly connected to the middle of the valve seat. The limiting post extends axially, and the limiter is fixedly connected to the end of the limiting post away from the valve seat. The valve seat, the limiting post, and the limiter remain relatively stationary, forming a fixed frame for the anti-backflow mechanism. The valve plate is sleeved on the outer periphery of the limiting post and located between the valve seat and the limiter. The valve plate is slidably connected to the limiting post, and the valve plate can reciprocate between an open position and a closed position along the axial direction of the limiting post to control the opening and closing of the valve seat channel. The spring is disposed between the limiter and the valve plate, with one end fixedly connected to the limiter and the other end fixedly connected to the valve plate. The spring provides a reset thrust.

[0007] Preferably, the limiter has a groove, the valve plate is fixedly connected to a sliding column, the sliding column is inserted into the groove, and the outer wall of the sliding column slides in cooperation with the inner wall of the groove. The sliding column can slide in the groove as the valve plate rises and falls, thereby providing auxiliary guidance and anti-rotation functions in addition to the limiting column.

[0008] Preferably, the valve seat is fixedly connected to a locking block, the valve plate has a clearance hole corresponding to the position of the locking block, and the limiter has a positioning groove corresponding to the position of the locking block that cooperates with the locking block; the locking block passes through the clearance hole on the valve plate in sequence and extends into the positioning groove on the limiter, and the locking block fits with the clearance hole on the valve plate, thereby ensuring that the assembly angle of the components is aligned.

[0009] Preferably, the number of springs is several, and the several springs are distributed in a circular array around the central axis of the limiting post. When the valve plate is in the closed state, the springs are in a compressed state and exert a thrust on the valve plate toward the valve seat to ensure sealing under low pressure differential.

[0010] Preferably, the main body includes an inlet end and an outlet end, the flow direction of the inlet end is set at an angle to the flow direction of the outlet end, the valve seat is installed at the junction of the inlet end and the outlet end, and the valve plate opens towards the outlet end to adapt to the angled pipe layout.

[0011] Preferably, the valve plate has a disc-shaped structure, the outer diameter of the valve plate is larger than the inner flow port diameter of the valve seat, and the side of the valve plate facing the valve seat has an annular sealing surface, which is sealed and fitted to the surface of the valve seat to achieve media blockage through surface contact.

[0012] Preferably, the limiter includes a central sleeve and a plurality of limiting arms extending radially outward from the central sleeve. The central sleeve is sleeved and fixed on the limiting post, and the spring abuts against the surface of the limiting arm. A spoke-type structure is adopted to reduce flow resistance.

[0013] Preferably, the end of the limiting post away from the valve seat is provided with a fastening thread, and the limiter is locked and fixed to the limiting post by the engagement of a nut with the fastening thread, which facilitates subsequent disassembly and maintenance.

[0014] Preferably, the length of the sliding column is less than the depth of the groove, ensuring that the end of the sliding column does not contact the bottom of the groove when the valve plate moves to its maximum stroke, thus preventing rigid collision.

[0015] This utility model has the following beneficial effects: 1. This utility model solves the problem of high medium flow rate and high flow resistance caused by the small flow area of ​​existing check valves by optimizing the inner diameter of the valve body inlet and adopting a large-diameter valve plate structure. It achieves the effect of effectively increasing the flow area, reducing the medium flow rate, significantly reducing pipeline energy loss and flow noise, and meets the energy-saving requirements of fluid transportation.

[0016] 2. This utility model, by adopting a stacked air valve structure consisting of a valve seat, valve plate, spring and limiter, eliminates the complex rocker or lifting mechanical structure of traditional check valves, and solves the problems of complex internal valve structure and high precision machining requirements in the prior art. It achieves the effect of reducing manufacturing difficulty, reducing raw material usage and processing time, thereby significantly reducing product manufacturing costs.

[0017] 3. This utility model solves the problems of cumbersome disassembly and assembly and difficult maintenance of internal components of traditional check valves by adopting a modular connection method with a central limiting post and nut locking. It achieves the effects of simple connection of each component, easy and quick disassembly, and quick repair and replacement of valve plate or spring when a fault occurs, shortening maintenance time and improving the reliability of device operation.

[0018] 4. This utility model solves the problem of valve plate easily rotating or tilting and getting stuck under the impact of high flow rate medium by setting an auxiliary guide structure with sliding column and sliding groove between valve plate and limiter, and combining the main guide function of central limit column. It achieves the effects of preventing valve plate wear, ensuring smooth lifting and lowering of valve plate and accurate reset sealing. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a pneumatic valve type angle check valve proposed in this utility model. Figure 2 This is a schematic diagram of the valve seat structure of a pneumatic valve type angle check valve proposed in this utility model. Figure 3 This is a schematic diagram of the valve plate structure of a pneumatic valve type angle check valve proposed in this utility model; Figure 4 This is a schematic diagram of the locking block of a pneumatic angle check valve proposed in this utility model.

[0020] Legend: 1. Main body; 2. Anti-backflow mechanism; 21. Valve seat; 22. Valve plate; 23. Limiter; 24. Spring; 25. Slide groove; 26. Limiting post; 27. Locking block; 28. Sliding post. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0022] Reference Figures 1 to 4 This utility model provides a pneumatic valve-type angle check valve, which aims to solve the structural defects of existing check valves, such as small flow area leading to fast medium flow rate, large energy loss, and high noise, as well as complex internal mechanical structure, high processing difficulty leading to high manufacturing cost and difficulty in disassembly and maintenance.

[0023] like Figure 1 and Figure 2 As shown, a pneumatic valve type angle check valve includes a main body 1 and an anti-backflow mechanism 2 fixedly connected inside the main body 1. The main body 1 serves as the valve shell and fluid channel carrier, used to accommodate the anti-backflow mechanism 2 and guide the flow direction of the medium. The main body 1 includes an inlet end and an outlet end. The flow channel axis of the inlet end and the flow channel axis of the outlet end are perpendicular to each other, forming an angle flow channel structure. The anti-backflow mechanism 2 is installed at the corner where the inlet end and the outlet end meet.

[0024] The anti-backflow mechanism 2 adopts a stacked assembly structure. The anti-backflow mechanism 2 includes a valve seat 21, a valve plate 22, a limiter 23, a spring 24, and a limiting post 26. The valve seat 21 is fixedly connected inside the main body 1. The valve seat 21 serves as the mounting base for the anti-backflow mechanism 2, which is used to withstand the medium pressure and provide a sealing interface. The limiting post 26 is fixedly connected to the middle of the valve seat 21. The limiting post 26 extends axially and is perpendicular to the disc surface of the valve seat 21. The end of the limiting post 26 away from the valve seat 21 is provided with a fastening thread. The limiter 23 is screwed onto the fastening thread by a matching nut, thereby locking and fixing the limiter 23 to the top of the limiting post 26. The valve seat 21, the limiting post 26, and the limiter 23 remain relatively stationary and together form the fixed frame of the anti-backflow mechanism 2. The surface of the valve plate 22 facing the valve seat 21 is a sealing plane. The sealing plane is used to fit the valve seat 21 to block the flow of the medium.

[0025] The limiter 23 adopts a spoke-type design, including a central hub sleeved on the limiting post 26 and several support arms extending outward from the central hub. The gap between the support arms serves as an auxiliary channel for media flow. The support arms of the limiter 23 have axially extending grooves 25. The inner wall surface of the grooves 25 is smoothed. A sliding post 28 is vertically fixed to the side of the valve plate 22 facing away from the valve seat 21 and facing the limiter 23. The position of the sliding post 28 corresponds one-to-one with the position of the groove 25. The sliding post 28 is inserted into the groove 25. The outer diameter of the sliding post 28 and the groove width of the groove 25 are clearance-fitted. The sliding post 28 can slide in the groove 25 as the valve plate 22 rises and falls. The length of the sliding post 28 is less than the depth of the groove 25 to prevent rigid collision when the valve plate 22 is opened to the maximum stroke. This fit structure restricts the valve plate 22 from rotating circumferentially around the limiting post 26.

[0026] The valve plate 22 is sleeved on the outer periphery of the limiting post 26 and located between the valve seat 21 and the limiter 23. The valve plate 22 has a guide hole in the center for the limiting post 26 to pass through. The valve plate 22 and the limiting post 26 form a sliding connection. The valve plate 22 can reciprocate between the open position and the closed position along the axis of the limiting post 26. The valve plate 22 has a disc-shaped structure. The outer diameter of the valve plate 22 is larger than the inner flow port diameter of the valve seat 21. The surface of the valve plate 22 facing the valve seat 21 is machined with an annular sealing surface. The annular sealing surface is used to tightly fit with the surface of the valve seat 21 to block the medium.

[0027] A locking block 27 is fixedly connected to the surface of the valve seat 21 facing the valve plate 22. The locking block 27 has a protruding structure. The valve plate 22 has a clearance hole with a size larger than the cross-section of the locking block 27 at the position corresponding to the locking block 27. The limiter 23 has a locking groove that matches the shape of the locking block 27 at the position corresponding to the locking block 27. The locking block 27 passes through the clearance hole on the valve plate 22 and extends into the positioning groove on the limiter 23. By engaging the locking block 27 with the positioning groove, it is ensured that the limiter 23 is fixed in position relative to the valve seat 21 and does not deflect, and the movement of the valve plate 22 is not interfered with by the locking block 27.

[0028] Spring 24 is disposed between limiter 23 and valve plate 22. The number of springs 24 is set to several. The several springs 24 are evenly distributed in a circular array around the central axis of limit post 26. One end of spring 24 abuts against the surface of support arm of limiter 23, and the other end is fixedly connected to the end face of valve plate 22 facing limiter 23. When valve plate 22 is in closed state, spring 24 is in pre-compressed state, and uses elastic potential energy to continuously apply a pushing force towards valve seat 21 to valve plate 22.

[0029] The working principle is as follows: When the medium flows in from the inlet end of the main body 1, the medium fluid pressure acts directly on the surface of the valve plate 22 facing the valve seat 21. As the pressure at the inlet end increases, the medium generates a thrust on the valve plate 22 to overcome the preload applied by the spring 24 and the weight of the valve plate 22 itself, pushing the valve plate 22 to slide closer to the limiter 23 along the axis of the limit post 26.

[0030] During the upward movement of valve plate 22, sliding column 28 fixed on the back of valve plate 22 slides synchronously upward in slide groove 25 of limiter 23. Through the dual guiding action of limit column 26 and slide groove 25, valve plate 22 is smoothly lifted upward and separated from valve seat 21, opening the flow channel in valve cavity. Medium flows smoothly to the outlet end of main body 1 through the flow port of valve seat 21 and through the gap of limiter 23.

[0031] When the pressure at the outlet of the main body 1 is higher than the pressure at the inlet or the medium at the inlet stops flowing, under the combined action of the reverse pressure difference and the restoring force of the spring 24, the valve plate 22 quickly slides back down along the limit post 26 to reset, and the sliding post 28 falls back into the slide groove 25 until the sealing surface of the valve plate 22 is tightly attached to the surface of the valve seat 21, cutting off the flow channel and preventing the medium from flowing back. At this time, the spring 24 maintains a continuous pressing force to ensure that the valve plate 22 still maintains a reliable sealing state under low pressure difference environment.

Claims

1. A pneumatic valve type angle check valve, comprising a main body (1) and an anti-backflow mechanism (2) disposed inside the main body (1); Its features are, The backflow prevention mechanism (2) includes a valve seat (21), a valve plate (22), a limiter (23), a spring (24), and a limiting post (26); The valve seat (21) is fixedly connected to the inside of the main body (1), and the limiting post (26) is fixedly connected to the middle of the valve seat (21). The limiter (23) is fixedly connected to the end of the limiting post (26) away from the valve seat (21). The valve seat (21), the limiting post (26) and the limiter (23) remain relatively stationary. The valve plate (22) is sleeved on the outer periphery of the limiting post (26) and located between the valve seat (21) and the limiter (23). The valve plate (22) is slidably connected to the limiting post (26). The valve plate (22) can reciprocate along the axial direction of the limiting post (26) to open or close the channel of the valve seat (21). The spring (24) is disposed between the limiter (23) and the valve plate (22), with one end of the spring (24) fixedly connected to the limiter (23) and the other end of the spring (24) fixedly connected to the valve plate (22).

2. The pneumatic valve type angle check valve according to claim 1, characterized in that, The limiter (23) has a groove (25), and the valve plate (22) is fixedly connected to a sliding column (28). The sliding column (28) is inserted into the groove (25), and the outer wall of the sliding column (28) slides in cooperation with the inner wall of the groove (25). The sliding column (28) can slide in the groove (25) as the valve plate (22) rises and falls.

3. The pneumatic valve type angle check valve according to claim 1, characterized in that, The valve seat (21) is fixedly connected to a locking block (27), the valve plate (22) has a locking groove corresponding to the position of the locking block (27), and the limiter (23) has a locking groove corresponding to the position of the locking block (27); The card block (27) passes through the slot on the valve plate (22) and the slot on the limiter (23) in sequence, and the card block (27) fits into the slot on the valve plate (22).

4. The pneumatic valve type angle check valve according to claim 1, characterized in that, The number of springs (24) is several, and the several springs (24) are arranged in a circular array around the central axis of the limiting post (26). When the valve plate (22) is in the closed state, the springs (24) are in the compressed state and exert a thrust on the valve plate (22) toward the valve seat (21).

5. A pneumatic valve type angle check valve according to claim 1, characterized in that, The main body (1) includes an inlet end and an outlet end. The flow direction of the inlet end is set at an angle to the flow direction of the outlet end. The valve seat (21) is installed at the junction of the inlet end and the outlet end. The opening direction of the valve plate (22) is towards the outlet end.

6. A pneumatic valve type angle check valve according to claim 1, characterized in that, The valve plate (22) has a disc-shaped structure. The outer diameter of the valve plate (22) is larger than the inner diameter of the valve seat (21). The surface of the valve plate (22) facing the valve seat (21) is a sealing plane. The sealing plane is used to fit the valve seat (21) to block the flow of the medium.

7. A pneumatic valve type angle check valve according to claim 1, characterized in that, The limiter (23) has a disc-shaped or strip-shaped structure. The outer diameter of the limiter (23) is adapted to the outer diameter of the valve plate (22). The limiter (23) is locked and fixed to the top of the limiting post (26) by a nut.

8. A pneumatic valve type angle check valve according to claim 2, characterized in that, The sliding post (28) is disposed on the side surface of the valve plate (22) facing the limiter (23). The number of the sliding posts (28) is the same as the number of the sliding grooves (25) and they are matched one by one to prevent the valve plate (22) from rotating around the limiting post (26).

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