Automatic overpressure isolating valve based on double-valve-clack structure

Abstract

The invention provides an automatic overpressure isolating valve based on a double-valve-clack structure, and the automatic overpressure isolating valve comprises a valve body which is internally provided with a cavity, and an inlet flange and an outlet flange are respectively arranged at two ends of the valve body; the guide shaft is arranged in the cavity, a cam and a flow guide seat are arranged on the two sides of the tail end of the guide shaft respectively, the guide shaft is sleeved with the flow guide seat, an upper guide sleeve and a lower guide sleeve are arranged at the two ends of the guide shaft respectively, the upper end of the guide shaft is sleeved with the front valve clack, the front valve clack is spirally connected with the upper end of the guide shaft, and the outer side of the front valve clack is connected with the upper guide sleeve. The cylindrical rotary valve clack is arranged at the lower end of the flow guide seat and matched with the cam to achieve rotation of the cylindrical rotary valve clack, the valve seat is arranged at the bottom of the flow guide seat and located below the cylindrical rotary valve clack, and the main spring is arranged on the guide shaft in a sleeving mode and located between the front valve clack and the lower guide sleeve. Double sealing of the valve body is achieved through the front valve clack and the cylindrical rotary valve clack, opening and closing of the valve are accurately controlled, sealing reliability is improved, and the leakage problem is avoided.

Description

Technical Field

[0001] The present invention relates to the field of valve structure design, and particularly to an automatic overpressure isolation valve based on a double valve flap structure. Background Art

[0002] As a core component of fluid control systems, automatic isolation valves are widely used in fields such as petroleum, chemical engineering, and electric power, and their performance directly affects system safety and efficiency. In the prior art, there are still significant deficiencies in the design of automatic isolation valves in terms of structural optimization, sealing performance, and intelligent control. The patent No. CN 118623074A of Ningbo Wanan Co., Ltd. discloses a "gas cut-off valve with an automatic air intake isolation function". This invention proposes a gas automatic air intake isolation valve, which realizes rapid response through sensors and an intelligent control system. However, it relies on a single valve flap structure, and its sealing performance is prone to degradation in high-pressure or highly corrosive environments, and it has a large volume and is difficult to adapt to the requirements of large-diameter pipelines above DN200. The patent No. CN119122467A of Heliyuan (Tianjin) Energy Technology Co., Ltd. discloses an "electro-hydraulic control isolation valve". This invention has the disadvantages of complex structure, relying on an external power source (electro-hydraulic system), high maintenance cost, and not solving the problem of bidirectional sealing under high-flow conditions. The patent No. CN115899345A of Ningbo Jiaming Metal Products Co., Ltd. discloses a "pipe self-closing valve". This invention realizes sealing through a permanent magnet and a lifting assembly, but magnetic control is easily affected by temperature and corrosive media, and it lacks a multi-level pressure threshold adjustment function and cannot adapt to a dynamic pressure change environment. The patent No. CN110274083A of Yuanda Industrial Control Technology (Hangzhou) Co., Ltd. discloses an "intelligent safety isolation valve". This invention uses an electronic lock to enhance operation safety, but its core is still a traditional single valve flap structure, and the problem of sealing surface friction displacement is not solved. After long-term use, the leakage rate is likely to increase due to wear. The patent No. CN118896187A of Jiangsu Fushen Special Valves Co., Ltd. discloses an "auxiliary valve for the detection of an on-line ventilation valve and a cut-off mechanism therefor". This invention proposes a double-sealed valve body design, and realizes double-port sealing of the storage tank and the valve through an auxiliary valve and a cut-off mechanism. However, its structure is complex, relying on external detection equipment, and it does not integrate an automatic reset function, and manual intervention is required to restore the process.

[0003] Therefore, there is an urgent need for an automatic isolation valve with a compact structure, strong sealing performance, and suitable for harsh working conditions. Summary of the Invention

[0004] In view of the above technical problems, the present invention provides an automatic overpressure isolation valve based on a double valve flap structure to solve the problems of large volume, slow response speed, and unreliable sealing in the prior art.

[0005] The present invention provides an automatic overpressure isolation valve based on a double valve flap structure. The automatic overpressure isolation valve based on the double valve flap structure includes: a valve body with a cavity inside, and an inlet flange and an outlet flange are respectively arranged at both ends; a guide shaft arranged in the cavity, with cams respectively arranged on both sides of the end; a flow guiding seat sleeved outside the guide shaft, with an upper guide sleeve and a lower guide sleeve respectively arranged at both ends; a pre-valve flap sleeved on the upper end of the guide shaft and spirally connected to the upper end of the guide shaft, and the outer side of the pre-valve flap is connected to the upper guide sleeve; a cylindrical rotary valve flap arranged at the lower end of the flow guiding seat and cooperating with the cams to realize the rotation of the cylindrical rotary valve flap; a valve seat arranged at the bottom of the flow guiding seat and located below the cylindrical rotary valve flap; and a main spring sleeved on the guide shaft and located between the pre-valve flap and the lower guide sleeve.

[0006] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: the cylindrical rotary valve flap includes a cylinder and several valve flaps. The inside of the cylinder is a hollow structure, and several valve flaps are welded to the bottom of the cylinder at intervals.

[0007] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: the inner surface of the cylinder is provided with a continuous guide rail surface, and the cams are located within the guide rail surface. The cams cooperate with the guide rail surface to realize the rotation of the cylindrical rotary valve flap.

[0008] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: the inlet flange and the outlet flange are connected to the valve body by welding, and both the inlet flange and the outlet flange are of a structure with a high middle and low ends.

[0009] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: a positive groove is arranged at the end of the guide shaft, two cams are respectively arranged at both ends of the positive groove and protrude outward from the outer side of the guide shaft, and an inner spring is arranged between the two cams.

[0010] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: the two cams are symmetrically arranged on both sides of the positive groove, and the diameters of the two cams are the same.

[0011] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: a key groove is arranged on the outer side surface of the lower end of the pre-valve flap, and a key matched with the key groove is arranged on the inner side surface of the upper guide sleeve.

[0012] In the automatic overpressure isolation valve based on the double valve flap structure provided by the present invention, it may further have the following characteristics: the axis of the positive groove and the axis of the key groove are in an orthogonal relationship.

[0013] In the automatic overpressure isolation valve based on a double valve flap structure provided by the present invention, it may further have the following characteristics: The part of the flow guiding seat located below the lower guide sleeve is a cavity structure. A base is provided at the bottom of the cavity. The cylindrical rotating valve flap part is arranged inside the cavity structure, and the valve flap part is located inside the base. The valve seat is arranged inside the base and is located below the cylindrical rotating valve flap.

[0014] In the automatic overpressure isolation valve based on a double valve flap structure provided by the present invention, it may further have the following characteristics: The valve seat is connected to the bottom of the cavity structure through a hot-fitting process.

[0015] The beneficial effects of the present invention are as follows:

[0016] In the automatic overpressure isolation valve based on a double valve flap structure of the present invention, it includes a valve body, an inlet flange, an outlet flange, a guide shaft, a flow guiding seat, a pre-valve flap, a cylindrical rotating valve flap, a valve seat, and a main spring. Among them, the inlet flange and the outlet flange are respectively arranged on both sides of the valve body. The guide shaft is arranged inside the valve body. The flow guiding seat is sleeved outside the guide shaft, and the pre-valve flap and the cylindrical rotating valve flap are respectively arranged at both ends of the guide shaft. A main spring is also arranged between the pre-valve flap and the lower guide sleeve on the flow guiding seat. Based on this isolation valve structure, through the pre-valve flap and the cylindrical rotating valve flap at both ends of the guide shaft, double sealing is set for the valve body, and the opening and closing of the valve can be accurately controlled by stage rotation of the valve body, significantly improving the sealing reliability in environments of high pressure, high flow rate, and corrosive media, and further avoiding the leakage problem caused by wear of a single valve in the traditional technology.

[0017] In addition, in this automatic overpressure isolation valve, the guide shaft is arranged inside the cavity of the valve body, the flow guiding seat is sleeved outside the guide shaft, the cylindrical rotating valve flap is arranged at the end of the flow guiding seat, and the main spring is also arranged on the guide shaft, so that each component is centrally arranged, the structure is compact, it can adapt to the requirements of large pipe diameters, and the occupation of installation space can be reduced.

[0018] Furthermore, the opening and closing of this automatic overpressure isolation valve completely depend on the medium pressure and the resilience of the spring, without the need to externally connect an electro-hydraulic system or a sensor, which can simplify the structure of the entire system and the later maintenance difficulty, and is especially suitable for harsh working conditions without external energy supply.

[0019] Moreover, through the cooperation of the cam on the guide shaft, the guide rail surface on the cylindrical rotating valve flap, and the spring, this isolation valve can respond to the pressure change in the pipeline in real time, adjust the valve state in stages, and support multi-level pressure threshold setting to adapt to complex dynamic pressure environments. Description of the Drawings

[0020] Figure 1 is a cross-sectional view of the automatic overpressure isolation valve based on a double valve flap structure in this embodiment;

[0021] Figure 2 It is a schematic structural diagram of the automatic overpressure isolation valve based on the double valve flap structure in this embodiment;

[0022] Figure 3 It is a schematic structural diagram of the automatic overpressure isolation valve based on the double valve flap structure in this embodiment;

[0023] Figure 4 It is a schematic structural diagram of the guide shaft in this embodiment;

[0024] Figure 5 It is a schematic structural diagram of the position of the cam on the guide shaft in this embodiment;

[0025] Figure 6 It is a schematic structural diagram of the diversion seat in this embodiment of the figure;

[0026] Figure 7 It is a schematic structural diagram of the cylindrical rotary valve flap in this embodiment of the figure. Detailed implementation manners

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] As Figures 1 to 7 shown, the automatic overpressure isolation valve based on the double valve flap structure in this embodiment includes a valve body 10, a guide shaft 20, a diversion seat 30, a pre-valve flap 40, a cylindrical rotary valve flap 50, a valve seat 60 and a main spring 70.

[0029] The interior of the valve body 10 is a cavity. Import flanges 11 and export flanges 12 are respectively welded at both ends of the valve body 10. The import flanges 11 and the export flanges 12 communicate with the cavity. Among them, both the import flanges 11 and the export flanges 12 are arranged in a structure with a middle part higher and both ends lower (that is, the central part close to the cavity is higher than the edge part far from the cavity).

[0030] The guide shaft 20 is vertically arranged in the cavity of the valve body 10. A forward groove is arranged at the end of the guide shaft 20 (the end close to the export flange 12), and a first cam 21 and a second cam 22 with equal diameters are symmetrically arranged at both ends of the forward groove. The outer sides of the first cam 21 and the second cam 22 both protrude from the outer side surface of the guide shaft 20, and the protruding lengths outward are the same. In addition, an inner spring 23 is also arranged inside the forward groove, and both ends of the inner spring 23 are respectively connected to the inner sides of the first cam 21 and the second cam 22.

[0031] The flow guide seat 30 is sleeved outside the guide shaft 20. An upper guide sleeve 31 is arranged at the upper end, and a lower guide sleeve 32 is arranged near the lower end in the middle. An outwardly protruding key 33 is arranged on the inner side surface of the upper guide sleeve 31. In addition, the position of the flow guide seat 30 below the lower guide sleeve 32 is a cavity structure. A base is arranged at the bottom of the cavity structure. Part of the cylindrical rotary valve flap 50 is arranged in the cavity structure, and the valve flap part is arranged in the base. The valve seat 60 is arranged on the base and is located below the valve flap part.

[0032] The lower end of the pre-valve flap 40 is sleeved on the upper end of the guide shaft 20 and is connected to the upper end of the guide shaft 20 by means of threaded connection. A key groove 41 is arranged on the outer side surface of the lower end. The key groove 41 is connected in cooperation with the key 33 on the upper guide sleeve 31. In addition, the axis of the key groove 41 is orthogonal to the axis of the forward groove. The rotation freedom of the guide shaft 20 relative to the pre-valve flap 40 is limited by using this orthogonal relationship and the mutually cooperating key groove 41 and key 33.

[0033] The cylindrical rotary valve flap 50 is arranged in the cavity structure below the lower guide sleeve 32 of the flow guide seat 30 and includes a cylinder 51 and a plurality of valve flaps 52. The inside of the cylinder 51 is a hollow structure. A continuous guide rail surface 53 is arranged on the inner surface of the hollow structure. The first cam 21 and the second cam 22 are located in the guide rail surface 53. A plurality of valve flaps 52 are evenly welded on the circumference of the bottom of the cylinder 51 at a certain interval.

[0034] The valve seat 60 is fixed in the cavity structure at the bottom of the flow guide seat 30 by a hot-fitting process and is located below the cylindrical rotary valve flap 50.

[0035] The main spring 70 is sleeved on the guide shaft 20 and is located between the lower guide sleeve 32 and the pre-valve flap 40.

[0036] The working principle of this automatic overpressure isolation valve based on a double-valve flap structure is as follows:

[0037] When there is no medium flowing or the medium pressure is lower than the valve opening pressure, the pre-valve flap 40 is in a closed state, that is, the front end of the pre-valve flap 40 abuts against the valve port, and the cylindrical rotary valve flap 50 realizes the closing of the valve tail end through cooperation with the valve seat 60.

[0038] When there is a medium flowing in the pipeline and the generated pressure reaches the preset opening threshold of the isolation valve, the medium will squeeze the front valve flap 40. The front valve flap 40 moves towards the valve seat 60 due to the moving pair formed by the key 33 on the guide sleeve 31 of the flow guide seat 30 and its own key groove 41, thereby compressing the main spring 70 installed on the guide shaft 20 to achieve the opening of the front valve. At the same time, since the upper end of the guide shaft 20 and the front valve flap 40 are connected through a screw pair, the guide shaft 20 will also move towards the valve seat 60 as the front valve opens, resulting in the first cam 21 and the second cam 22 machined on both sides of the bottom of the guide shaft 20 moving along the continuous cam guide surface 53 on the inner wall of the cylinder 51 of the cylindrical rotary valve flap 50. Due to the fixed movement of the cam, it only makes a translational movement within the guide surface 53 as the guide shaft 20 moves and does not rotate. When the first cam 21 and the second cam 22 move towards the valve seat 60 along the guide surface 53, the valve flap 52 at the bottom of the cylinder 51 will rotate by 30°, that is, the spring converts the compressed axial force into the rotational force of the cylindrical rotary valve flap 50 to reach the fully open state.

[0039] When the pressure in the pipeline is greater than the set normal threshold, the medium will continue to compress the front valve flap 40. Similarly to the above, the first cam 21 and the second cam 22 continue to move towards the valve seat 60 along the guide rail until they reach the bottom end of the guide surface 53, that is, the first cam 21 and the second cam 22 move to the position on the guide surface 53 closest to the valve seat. At this time, the cylindrical rotary valve flap 50 rotates by another 30°, and at this time, the cylindrical rotary valve flap 50 cooperates with the valve seat 60 to achieve the complete closing of the valve tail end, blocking the flow of the medium.

[0040] When the pressure generated by the medium is less than the opening pressure of the front valve, the main spring 70 will rebound the first cam 21 and the second cam 22 from the bottom end of the guide surface 53 to the top end, that is, the first cam 21 and the second cam 22 rebound from the position on the guide surface 53 closest to the valve 60 to the position on the guide surface 53 closest to the front valve flap 40. When the first cam 21 and the second cam 22 move towards the top end, the cylinder 51 does not rotate, and at this time, the rotary valve flap 52 on the cylinder 51 still keeps the valve in a sealed state. At the same time, the front valve flap 40 will be pushed back to the valve port under the action of the spring resilience, and at this time, the isolation valve is in a fully closed state in both directions, that is, the initial state.

[0041] In the automatic overpressure isolation valve based on the double-valve flap structure in the above-mentioned embodiments, it includes a valve body, an inlet flange, an outlet flange, a guide shaft, a flow guide seat, a front valve flap, a cylindrical rotary valve flap, a valve seat, and a main spring. Among them, the inlet flange and the outlet flange are respectively arranged on both sides of the valve body, the guide shaft is arranged inside the valve body, the flow guide seat is sleeved outside the guide shaft, and the front valve flap and the cylindrical rotary valve flap are respectively arranged at both ends of the guide shaft. A main spring is also arranged between the front valve flap and the lower guide sleeve on the flow guide seat. Based on this isolation valve structure, through the front valve flap and the cylindrical rotary valve flap at both ends of the guide shaft, double sealing is set for the valve body, and the opening and closing of the valve can be accurately controlled by rotating the valve body in stages, significantly improving the sealing reliability in high-pressure, high-flow-rate, and corrosive medium environments, and further avoiding the leakage problem caused by wear of a single valve in the traditional technology.

[0042] In addition, in this automatic overpressure isolation valve, the guide shaft is arranged in the cavity of the valve body, the flow guide seat is sleeved outside the guide shaft, the cylindrical rotary valve flap is arranged at the end of the flow guide seat, and the main spring is also arranged on the guide shaft, so that each component is centrally arranged, with a compact structure, capable of adapting to the requirements of large pipe diameters and reducing the occupation of installation space.

[0043] Furthermore, the opening and closing of this automatic overpressure isolation valve completely depend on the medium pressure and the resilience of the spring, without the need to externally connect an electro-hydraulic system or a sensor, which can simplify the structure of the entire system and the later maintenance difficulty, and is especially suitable for harsh working conditions without external energy supply.

[0044] Moreover, through the coordinated action of the cam on the guide shaft, the guide rail surface on the cylindrical rotary valve flap, and the spring, this isolation valve can respond to the pressure change in the pipeline in real time, adjust the valve state in stages, and support multi-level pressure threshold setting to adapt to a complex dynamic pressure environment.

[0045] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications.

Claims

1. An automatic overpressure isolation valve based on a double valve flap structure, characterized in that, Comprising: A valve body, with a cavity inside, and an inlet flange and an outlet flange are respectively arranged at both ends; A guide shaft, which is arranged inside the cavity, and cams are respectively arranged on both sides of the end; A flow guide seat, which is sleeved outside the guide shaft, and an upper guide sleeve and a lower guide sleeve are respectively arranged at both ends; A pre-valve flap, which is sleeved on the upper end of the guide shaft and is screwed to the upper end of the guide shaft, and the outside of this pre-valve flap is connected to the upper guide sleeve; A cylindrical rotary valve flap, which is arranged at the lower end of the flow guide seat and cooperates with the cam to realize the rotation of the cylindrical rotary valve flap; A valve seat, which is arranged at the bottom of the flow guide seat and is located below the cylindrical rotary valve flap; A main spring, which is sleeved on the guide shaft and is located between the pre-valve flap and the lower guide sleeve.

2. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 1, characterized in that: The cylindrical rotary valve flap includes a cylinder and a plurality of valve flaps; The inside of the cylinder is a hollow structure, and a plurality of the valve flaps are welded to the bottom of the cylinder at intervals.

3. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 2, characterized in that: A continuous guide rail surface is arranged on the inner surface of the cylinder, the cam is located inside the guide rail surface, and the cam cooperates with the guide rail surface to realize the rotation of the cylindrical rotary valve flap.

4. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 1, characterized in that: The inlet flange and the outlet flange are connected to the valve body by welding; Both the inlet flange and the outlet flange have a structure with a higher middle and lower ends.

5. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 1, characterized in that: A positive groove is arranged at the end of the guide shaft, and two cams are respectively arranged at both ends of the positive groove and protrude outward from the outer side surface of the guide shaft; An inner spring is arranged between the two cams.

6. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 5, characterized in that: The two cams are symmetrically arranged on both sides of the positive groove, and the two cams have the same diameter.

7. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 5, characterized in that: A key groove is arranged on the outer side surface of the lower end of the pre-valve flap, and a key matched with the key groove is arranged on the inner side surface of the upper guide sleeve.

8. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 7, characterized in that: The axis of the positive groove and the axis of the key groove are in an orthogonal relationship.

9. The automatic overpressure isolation valve based on the double-valve flap structure according to claim 1, characterized in that: The part of the flow guide seat located at the lower guide sleeve is a cavity structure, a base is arranged at the bottom of the cavity, a part of the cylindrical rotary valve flap is arranged inside the cavity structure, and the valve flap part is located inside the base; The valve seat is arranged inside the base and is located below the cylindrical rotary valve flap.

10. The automatic overpressure isolation valve based on a double valve flap structure according to claim 9, characterized in that: The valve seat is connected to the bottom of the cavity structure by a hot-fitting process.

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