Split type double-blade pneumatic check valve

Abstract

The utility model relates to the technical field of pneumatic check valves, in particular to a split type double-blade pneumatic check valve which comprises a pneumatic check valve body, the pneumatic check valve body is of a transverse frame structure shaped like a Chinese character'ri ', blades are symmetrically installed in the pneumatic check valve body, sealing rings are arranged on the outer rings of the blades, and the blades form a split type double-blade structure. Driving shafts symmetrically and longitudinally penetrate through the two sides of the pneumatic check valve body, and driving shaft hinge arms are evenly and fixedly arranged on the driving shafts in a sleeving mode at intervals. According to the split type double-blade pneumatic check valve, more balanced stress distribution is achieved through the split type double blades, medium backflow can be effectively prevented, once the medium backflow trend occurs, the double blades can respond quickly, reliable sealing is formed through tight closing, compared with a single blade, the larger sealing area and the better sealing effect can be provided, and the service life of the double-blade pneumatic check valve is prolonged. The backflow prevention capability of the check valve is greatly enhanced, and the safety of a pipeline system is effectively protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pneumatic check valve, concretely to a double-leaf pneumatic check valve of split type. BACKGROUND

[0002] In industrial fluid control systems, the air valve is one of the key control elements, composed of valve body, blade, actuator, sealing element and other parts, mainly used for adjusting, controlling and guiding the flow direction, pressure and flow of gas (such as air, steam or other process gas), and can prevent gas backflow to protect the system from damage.

[0003] The existing air valve design usually adopts single-leaf structure, which is simple in design, but often cannot meet the requirements of high-efficiency sealing in practical application. In addition, the driving mechanism of traditional air valve is mostly manual operation, which not only increases the difficulty of operation, but also limits its wide application in automatic systems. With the continuous improvement of industrial automation, the performance requirements of air valve are becoming higher and higher, especially in terms of sealing performance and operation convenience. Due to the poor sealing performance, inconvenient operation and difficult maintenance of air valve, not only the stability and efficiency of the system are affected, but also the use cost and maintenance difficulty are increased.

[0004] Therefore, it is of great significance to develop a new type of air valve with simple structure, convenient operation and excellent sealing performance. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a double-leaf pneumatic check valve of split type to solve the problems of poor sealing performance, inconvenient operation and difficult maintenance of air valve in the current market, which not only affects the stability and efficiency of the system, but also increases the use cost and maintenance difficulty.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a double-leaf pneumatic check valve of split type, comprising a pneumatic check valve body, the pneumatic check valve body is a horizontal day-shaped frame structure, and symmetrical leaf blades with outer ring sealing rings are installed in the pneumatic check valve body, so that the leaf blades form a double-leaf structure of split type, drive shafts are symmetrically and longitudinally penetrated through both sides of the pneumatic check valve body, drive shaft hinge arms are uniformly and interval fastened on the drive shafts, shaft end sealing devices are respectively installed on both ends of the drive shafts, and a drive rocker arm is further fixed on the top of the drive shaft, supports are symmetrically provided on the outside of the top of the pneumatic check valve body, air cylinders are respectively installed on the supports, and pull pins are connected between the output end of the air cylinder and the drive rocker arm, so that the movement of the piston of the air cylinder is transmitted to the drive shaft through the drive rocker arm to realize the rotation of the drive shaft, and rear bearing devices are further installed on the bottom of the pneumatic check valve body at the drive shaft.

[0007] Preferably, the limit device is arranged on the upper end of the pneumatic check valve body and contacts the driving rocker arm.

[0008] Preferably, bearing sealing covers are arranged on the rear bearing device and are bolted to each other, angular contact ball bearings are arranged on the bearing sealing covers through clamping, bearing positioning sleeves are arranged on the upper ends of the angular contact ball bearings and are tightly inserted into the driving shaft, and the bearing sealing covers on the upper end of the rear bearing device are bolted to the bearing positioning sleeves through compression pads.

[0009] Preferably, the pull pin is a U-shaped member arranged in a transverse direction, the pull pin is rotatably connected to the driving rocker arm through a shaft pin structure, and the pull pin is tightly fastened to the output end of the cylinder through bolts and nuts.

[0010] Preferably, hinge arm connecting plates are symmetrically welded on the inner sides of the driving shaft hinge arms, and at least two connecting pins are tightly inserted between the hinge arm connecting plates and the blades.

[0011] Preferably, upper and lower sealing rings are arranged on the shaft end sealing device and are tightly clamped to each other, the upper and lower sealing rings are tightly bolted to each other, and sealing medium is filled between the upper and lower sealing rings.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] 1. The double-blade split pneumatic check valve can effectively prevent medium backflow through the balanced force distribution of the double-blade split structure, the double blades can quickly respond to the trend of medium backflow, form reliable sealing through close closing, provide larger sealing area and better sealing effect compared with single-blade structure, greatly enhance the ability of the check valve to prevent backflow, and effectively protect the safety of the pipeline system.

[0014] 2. The double-blade split pneumatic check valve can realize the rotation of the driving shaft through the rotation of the driving rocker arm driven by the piston movement of the cylinder, thereby realizing the opening and closing of the blades, reducing the energy loss and mechanical failure risk of the intermediate transmission link, improving the reliability and stability of the opening and closing action, and fully considering the overall layout and space utilization of the valve through the arrangement position and structure design of the cylinder, so that the structure of the entire check valve is more compact, the installation and maintenance are convenient, the installation and maintenance cost of the equipment is reduced, and the space utilization of the production site is improved.

[0015] 3. The split double-blade pneumatic check valve is provided with a shaft end sealing device at the end of the drive shaft, adopts the combined design of sealing medium, upper sealing ring and lower sealing ring, effectively enhances the sealing performance, can greatly prevent the medium from leaking from the shaft end, significantly improves the sealing reliability of the valve, reduces the energy waste, environmental pollution and system failure risk caused by medium leakage, ensures the safe and stable operation of the industrial pipeline system, and effectively reduces the maintenance cost and potential loss of enterprises. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an air inlet direction three-dimensional structure schematic view of the split double-blade pneumatic check valve of the utility model;

[0017] Figure 2 It is an air outlet direction three-dimensional structure schematic view of the split double-blade pneumatic check valve of the utility model;

[0018] Figure 3 It is a top view of the split double-blade pneumatic check valve of the utility model;

[0019] Figure 4 It is a front view of the split double-blade pneumatic check valve of the utility model;

[0020] Figure 5 It is a split double-blade pneumatic check valve of the utility model Figure 4 The enlarged structure schematic view of A;

[0021] Figure 6 It is a split double-blade pneumatic check valve of the utility model Figure 4 The enlarged structure schematic view of B;

[0022] Figure 7 It is a split double-blade pneumatic check valve of the utility model Figure 4 The enlarged structure schematic view of C;

[0023] Figure 8 It is a side view of the split double-blade pneumatic check valve of the utility model.

[0024] In the drawing: 1, blade; 2, pneumatic check valve main body; 3, rear bearing device; 301, bearing sealing cover; 302, bearing positioning sleeve; 303, compression gasket; 304, angular contact ball bearing; 4, pull pin; 5, air cylinder; 6, drive shaft; 7, connecting pin shaft; 8, drive shaft hinge arm; 801, hinge arm connecting plate; 9, shaft end sealing device; 901, lower sealing ring; 902, upper sealing ring; 903, sealing medium; 10, limiting device; 11, support; 12, drive rocker arm. DETAILED DESCRIPTION

[0025] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0026] Please refer to Figures 1-8The utility model provides a technical scheme: a kind of double-leaf air non-return valve of split type, including pneumatic check valve main body 2, pneumatic check valve main body 2 is transverse sun-shaped frame structure, and symmetrically installed with the leaf 1 of outer ring setting sealing ring in pneumatic check valve main body 2, make leaf 1 constitute split type double-leaf structure, and drive shaft 6 is symmetrically longitudinally penetrated in the two sides of pneumatic check valve main body 2, and drive shaft hinge arm 8 is uniformly spaced and fastened with drive shaft on drive shaft 6, symmetrically welded with hinge arm connecting plate 801 in drive shaft hinge arm 8 inside, and at least two connecting pin shafts 7 are respectively fastened and penetrated between hinge arm connecting plate 801 and leaf 1, this structure can realize the fixation of leaf 1 relative to drive shaft 6 by fixing leaf 1 on drive shaft hinge arm 8, so the rotation of drive shaft 6 can drive leaf 1 to rotate, by designing two leaves 1, more balanced stress distribution can be provided, the structural advantage of double-leaf is more obvious on the function of preventing medium backflow, double-leaf can respond quickly once the trend of medium backflow appears, form reliable sealing by close closing, compared with single-leaf, can provide larger sealing area and better sealing effect, greatly enhance the ability of check valve to prevent backflow, effectively protect the safety of pipeline system, shaft end sealing device 9 is respectively installed with the sleeve of both ends of drive shaft 6, upper sealing ring 902 and lower sealing ring 901 are equipped on shaft end sealing device 9 and are mutually sealed and clamped, and upper sealing ring 902 and lower sealing ring 901 are bolted between, and upper sealing ring 902 and lower sealing ring 901 are filled with sealing medium 903 between, this structure is filled with sealing gap by sealing medium 903, effectively enhances sealing performance, while upper sealing ring 902 and lower sealing ring 901 can greatly prevent sealing medium 903 from leaking from shaft end, compared with traditional check valve, the sealing reliability of leaf 1 closing is significantly improved, energy waste, environmental pollution and system failure risk caused by sealing medium 903 leakage are reduced, ensure the safe and stable operation of industrial pipeline system, effectively reduce the maintenance cost and potential loss of enterprise, and drive rocker arm 12 is further fixed on the top of drive shaft 6, limit device 10 is installed on the side surface of drive rocker arm 12 on the upper end of pneumatic check valve main body 2, and limit device 10 is in contact with drive rocker arm 12, this structure can limit the rotation angle of drive rocker arm 12 through limit device 10, to avoid that leaf 1 is excessively opened or closed, prevent pneumatic check valve main body 2 from being damaged or generating security risk, the part of limit device 10 and drive rocker arm 12 contact can be designed damping structure, protect drive rocker arm 12, support 11 is symmetrically equipped on the outside of the top of pneumatic check valve main body 2, and cylinder 5 is respectively installed on support 11, and pull pin 4 is connected between the output end of cylinder 5 and drive rocker arm 12, so that the piston movement of cylinder 5 acts on drive shaft 6 through drive rocker arm 12, can realize the rotation on drive shaft 6, pull pin 4 is horizontally arranged U-shaped piece, and pull pin 4 is rotatably connected with drive rocker arm 12 through shaft pin structure, and pull pin 4 and cylinder 5 output end are fastened through bolt and nut,The structure can stably connect the cylinder 5 and the pull pin 4, and the pull pin 4 and the driving rocker arm 12 can rotate relative to each other, so that when the piston moves, the cylinder 5 can transmit the piston movement to the driving rocker arm 12 through the pull pin 4, realize the rotation of the driving rocker arm 12, and realize the synchronous rotation of the driving shaft 6 through the rotation of the driving rocker arm 12, and then realize the opening and closing driving process of the blade 1. The cylinder 5 is connected to the driving shaft 6 through the driving rocker arm 12, so that the power transmission is more direct and efficient. The cylinder 5 can quickly and accurately provide the power required for opening and closing the valve according to the instruction of the control system, so as to ensure that the pneumatic check valve body 2 can respond in time under various working conditions. Compared with some traditional arrangement modes, the energy loss and mechanical failure risk of the intermediate transmission link are reduced, the reliability and stability of the blade 1 action are improved, and the arrangement position and structure design of the cylinder 5 fully consider the overall layout and space utilization of the pneumatic check valve body 2, so that the structure of the entire pneumatic check valve body 2 is more compact, easy to install and maintain, reduces the installation and maintenance cost of the equipment, improves the space utilization of the production site, and the bottom of the pneumatic check valve body 2 is provided with a rear bearing device 3 at the driving shaft 6. The bearing sealing cover 301 is bolted and fixed on the rear bearing device 3, and the angular contact ball bearing 304 is clamped and installed between the bearing sealing covers 301. The bearing positioning sleeve 302 is fixed on the upper end of the angular contact ball bearing 304, and the bearing positioning sleeve 302 is tightly inserted into the driving shaft 6. The bearing sealing cover 301 at the upper end of the rear bearing device 3 is fixed with a compression gasket 303 through bolts, and the compression gasket 303 and the bearing positioning sleeve 302 are penetratingly arranged. The structure can connect the angular contact ball bearing 304 and the driving shaft 6 through the bearing positioning sleeve 302, so that the driving shaft 6 can rotate under the support of the angular contact ball bearing 304. The bearing sealing cover 301 and the compression gasket 303 can cooperate to prevent fluid leakage.

[0027] Working principle: when using the split double-blade pneumatic check valve, first, when the pneumatic check valve body 2 needs to be opened, the cylinder 5 receives the driving signal of the external control system, starts to work, and makes the piston in the cylinder 5 move under the action of gas pressure, through the connection of the pull pin 4 and the driving rocker arm 12, the movement of the piston of the cylinder 5 drives the driving rocker arm 12 to rotate, through the fixation of the driving rocker arm 12 and the driving shaft 6, the synchronous rotation of the driving shaft 6 is realized, the limiting device 10 is used to limit the rotation angle of the driving shaft 6 to avoid excessive opening, the bracket 11 is used for reliable installation of the cylinder 5, because the driving shaft 6 is rigidly connected with the driving shaft hinge arm 8, so that the driving shaft hinge arm 8 moves synchronously, therefore, the blade 1 fastened on the driving shaft hinge arm 8 through the cooperation of the hinge arm connecting plate 801 and the connecting pin shaft 7 rotates, the opening of the pneumatic check valve body 2 is realized, so that the medium can smoothly pass through, during the rotation of the driving shaft 6, the rear bearing device 3 provides support for the stable rotation of the driving shaft 6, the bearing positioning sleeve 302 plays a connecting role for the driving shaft 6 and the angular contact ball bearing 304, so that the driving shaft 6 rotates through the support of the angular contact ball bearing 304, ensuring the smoothness and accuracy of rotation, reducing friction and energy loss, the bearing sealing cover 301 is sealed with the compression gasket 303, which is used to avoid medium leakage, at the same time, the shaft end sealing device 9 avoids the leakage of medium at the gap between the driving shaft 6 and the pneumatic check valve body 2 through the sealing design of the lower sealing ring 901, the upper sealing ring 902 and the sealing medium 903, ensuring the sealing property of the system, when the medium in the pipeline system flows forward, the split double-blade structure of the blade 1 can adaptively adjust the opening and closing angle according to the flow and pressure changes of the medium, reducing the resistance and energy loss of the medium flow, and improving the conveying efficiency of the pipeline system, when the medium flows backward, the backward medium will generate a reverse force on the blade 1, because of the split design of the blade 1, the blade 1 will gradually close under the pressure action of the backward medium without external power driving, effectively preventing the backward flow of the medium and protecting the safety of the pipeline system, thereby completing a series of work.

[0028] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A split double vane pneumatic non-return valve comprising a pneumatic non-return valve body (2), characterised in that: The pneumatic check valve body (2) is a transverse day-shaped frame structure, and the pneumatic check valve body (2) is symmetrically provided with a vane (1) with a sealing ring arranged on the outer ring, so that the vane (1) forms a double-leaf structure, the pneumatic check valve body (2) is symmetrically and longitudinally penetrated by a driving shaft (6), and the driving shaft (6) is uniformly and spacedly provided with a driving shaft hinge arm (8) sleeved thereon, the driving shaft (6) is respectively sleeved and mounted with an axle end sealing device (9) at both ends, and the driving shaft (6) is further fixed with a driving rocker arm (12) at the top, the pneumatic check valve body (2) is symmetrically provided with a support (11) on the top outer side, the support (11) is respectively provided with a pneumatic cylinder (5), and a pull pin (4) is connected between the output end of the pneumatic cylinder (5) and the driving rocker arm (12), so that the piston movement of the pneumatic cylinder (5) acts on the driving shaft (6) through the driving rocker arm (12), and the rotation of the driving shaft (6) can be realized, and the pneumatic check valve body (2) is further provided with a rear bearing device (3) at the bottom of the driving shaft (6).

2. The split double vane pneumatic check valve according to claim 1, characterized in that: The limit device (10) is installed on the upper end of the pneumatic check valve body (2) and contacts the driving rocker arm (12).

3. The split double vane pneumatic check valve according to claim 1, wherein: The rear bearing device (3) is provided with bearing sealing covers (301) which are bolted to each other, and angular contact ball bearings (304) are clamped and installed between the bearing sealing covers (301), the upper end of the angular contact ball bearing (304) is fixed with a bearing positioning sleeve (302), and the bearing positioning sleeve (302) is tightly inserted into the driving shaft (6), the bearing sealing cover (301) at the upper end of the rear bearing device (3) is fixed by bolts and is provided with a compression gasket (303), and the compression gasket (303) and the bearing positioning sleeve (302) are penetrated.

4. The split double vane pneumatic check valve according to claim 1, wherein: The pull pin (4) is a U-shaped piece arranged transversely, the pull pin (4) is rotatably connected with the driving rocker arm (12) through a shaft pin structure, and the pull pin (4) is fastened with the output end of the pneumatic cylinder (5) by bolts and nuts.

5. The split double vane pneumatic check valve according to claim 1, wherein: The hinge arm connecting plates (801) are symmetrically welded on the inner sides of the driving shaft hinge arms (8), and at least two connecting pins (7) are respectively and tightly penetrated between the hinge arm connecting plates (801) and the vanes (1).

6. The split double vane pneumatic check valve according to claim 1, wherein: The upper sealing ring (902) and the lower sealing ring (901) are sealed and clamped on the axle end sealing device (9), the upper sealing ring (902) and the lower sealing ring (901) are bolted, and the upper sealing ring (902) and the lower sealing ring (901) are filled with a sealing medium (903).

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