Pneumatic combination valve with long service life

Abstract

The utility model relates to the field of valve manufacturing, in particular to a long-service-life type pneumatic combination valve which comprises a valve shell module, an air cylinder module, a sealing ring assembly and an air valve assembly. The valve shell module comprises a left end cover, a right end cover, a cylinder barrel, a liquid inlet, a liquid outlet, an air inlet and outlet opening A, an air inlet and outlet opening B and a tensioning stud. The air cylinder module comprises a cylinder barrel, a piston, a piston rod, a spiral spring and a spring guide column. The sealing ring assembly comprises a left movable sealing ring, a right movable sealing ring, a piston sealing ring, a left static sealing ring and a right static sealing ring. The valve assembly comprises a valve element, a valve element positioning bolt and a flow stabilizer. Opening and closing of a liquid path are controlled through the air cylinder coaxial with the liquid conveying path, the tensioning stud and the flange plate are mutually locked, and therefore the structure is more compact and safer, meanwhile, all parts of the device are easy to machine and assemble, and the manufacturing and maintaining cost is low.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a long-life pneumatic combination valve. Background Art

[0002] The valve core and valve seat of a coaxial valve are located on the same axis. An actuator controls the movement of the valve core to open and close the valve. Automatic coaxial valves are classified into two types: pneumatic and solenoid. The former uses compressed air to drive the reciprocating motion of a piston to control the valve's opening and closing. Existing pneumatic coaxial valves suffer from drawbacks such as the tapered valve core's wear, unsmooth piston movement, complex structure, and high manufacturing costs. This results in poor long-term reliability and lifespan.

[0003] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present invention concept, and therefore, it may contain information that does not constitute prior art. Utility Model Content

[0004] In response to the problems of complex structure and poor life of pneumatic coaxial valves in the existing technology, the utility model proposes a long-life pneumatic combination valve, which controls the opening and closing of the liquid path through a cylinder coaxial with the liquid transmission path, and ensures long-term and smooth movement of the cylinder piston through the surrounding coil springs and spring guide columns. By improving the assembly relationship, the valve structure is made more compact and more conducive to processing and manufacturing. By arranging a wear-resistant sealing ring in the gap, the overall sealing performance and life of the device are improved.

[0005] Specifically, the specific solution of the device of the utility model includes a valve housing module, a cylinder module, a sealing ring assembly and a valve assembly.

[0006] The valve housing module includes: a left end cap, a right end cap, a cylinder, a liquid inlet, a liquid outlet, inlet and exhaust ports A and B, and tensioning studs. The left and right end caps are fixedly mounted on the left and right sides of the cylinder, respectively. The liquid inlet and outlet are located on the left and right end caps, respectively. Inlet and exhaust ports A and B are both located on the side of the cylinder, with inlet and exhaust port A communicating with the left chamber of the cylinder module, and inlet and exhaust port B communicating with the right chamber of the cylinder module. Tensioning studs are distributed around the exterior of the valve housing module; their ends are threadedly connected to the left and right end caps, respectively.

[0007] The cylinder module includes: a cylinder barrel, a piston, a piston rod, a coil spring and a spring guide column; wherein the piston rod is a hollow tubular structure, and the piston is coaxial and fixedly mounted on the outer circumference of the piston rod; the left end cover, the cylinder barrel and the piston together form the left chamber of the cylinder module; the right end cover, the cylinder barrel and the piston together form the right chamber of the cylinder module; the number of the coil springs is greater than that at, and they are evenly arranged in the circumferential direction of the axis of the piston rod; one end of the coil spring is in contact with the left end cover, and the other end is in contact with the end face of the piston; the coil spring and the spring guide column are arranged in pairs, and the coil spring surrounds the outer circumference of the spring guide column.

[0008] The sealing ring assembly includes: a left dynamic sealing ring, a right dynamic sealing ring, a piston sealing ring, a left static sealing ring and a right static sealing ring; wherein, the left dynamic sealing ring is located in the fitting gap between the left end cover and the piston rod, and the right dynamic sealing ring is located in the fitting gap between the right end cover and the piston rod.

[0009] The valve assembly includes a valve core, a valve core retaining bolt, and a flow stabilizer. The flow stabilizer is fixedly connected to the right end cap. The flow stabilizer has a straightening curved surface on the side facing the liquid outlet to stabilize the outflowing fluid stream. The valve core is fixedly connected to the flow stabilizer via the valve core retaining bolt. The valve core is made of wear-resistant rubber or polytetrafluoroethylene.

[0010] Compared with the prior art, the present invention has significant advantages and beneficial effects, which are specifically reflected in the following aspects:

[0011] The opening and closing of the liquid path is controlled by a cylinder coaxial with the liquid transmission path, making the valve structure more compact;

[0012] The cylinder piston is automatically reset by a surrounding coil spring to prevent the cylinder piston from getting stuck and improve the safety of the gate valve;

[0013] The front end of the valve assembly is made of wear-resistant material, and the rear end of the valve assembly is provided with a flow stabilizer to ensure that the fluid flowing through the valve has little pressure loss and a stable flow rate.

[0014] The valve housing module is provided with tension studs distributed around the valve body, and the tension studs on the same side are locked together through the flange to improve the overall pressure bearing and sealing performance of the valve.

[0015] The various parts of the device are easy to process and assemble, and the manufacturing and maintenance costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1It is the appearance schematic view of the device of the utility model;

[0018] Figure 2 It is the full section schematic view of the device of the utility model;

[0019] Figure 3 It is the sealing ring position schematic view of the device of the utility model.

[0020] In the drawing,

[0021] Left end cover;2, right end cover;3, cylinder;4, piston;5, piston rod;6, left dynamic sealing ring;61, right dynamic sealing ring;63, piston sealing ring;64, left static sealing ring;65, right static sealing ring;7, helical spring;8, spring guide column;9, valve core;91, valve core positioning bolt;10, tension stud;11, flow stabilizer;12, liquid inlet;13, liquid outlet;15, air inlet A;16, air inlet B. DETAILED DESCRIPTION

[0022] In order to make the personnel in the technical field better understand the utility model scheme, the technical scheme in the embodiment of the utility model will be described clearly and completely in the embodiment of the utility model below, obviously, the described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor should belong to the scope of protection of the utility model.

[0023] It should be noted that the terms "first", "second" and the like in the description and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the utility model described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, the process, method, system, product or equipment including a series of steps or units does not have to be limited to the clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0024] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form, and in addition, it should be understood that when the terms "contain" and / or "include" are used in the specification, they indicate the presence of a feature, step, operation, device, component and / or their combination.

[0025] AsFigures 1-3 As shown, a long-life pneumatic combination valve of this embodiment includes a valve housing module, a cylinder module, a sealing ring assembly and a valve assembly.

[0026] The valve housing module, such as Figure 1 and Figure 2 As shown, it includes: a left end cap 1, a right end cap 2, a cylinder 3, a liquid inlet 12, a liquid outlet 13, an inlet and outlet A15, an inlet and outlet B16, and a tensioning stud 10. The left end cap 1 and the right end cap 2 are fixedly mounted on the left and right sides of the cylinder 3, respectively. The liquid inlet 12 and the liquid outlet 13 are located on the left end cap 1 and the right end cap 2, respectively. The inlet and outlet A15 and the inlet and outlet B16 are both located on the side of the cylinder 3, with the inlet and outlet A15 communicating with the left chamber of the cylinder module, and the inlet and outlet B16 communicating with the right chamber of the cylinder module. There are four tensioning studs 10, distributed around the exterior of the valve housing module. The two ends of the tensioning studs 10 are threadedly connected to the left end cap 1 and the right end cap 2, respectively.

[0027] The cylinder module, such as Figure 2 As shown, it includes: a cylinder 3, a piston 4, a piston rod 5, a coil spring 7 and a spring guide post 8; wherein the piston rod 5 is a hollow tubular structure, and the piston 4 is coaxially and fixedly mounted on the outer circumference of the piston rod 5; the left end cover 1, the cylinder 3 and the piston 4 together form the left chamber of the cylinder module; the right end cover 2, the cylinder 3 and the piston 4 together form the right chamber of the cylinder module; the number of the coil springs 7 is greater than one and is evenly arranged in the circumferential direction of the axis of the piston rod 5; one end of the coil spring 7 is in contact with the left end cover 1, and the other end is in contact with the end surface of the piston 4; the coil spring 7 and the spring guide post 8 are arranged in pairs, and the coil spring 7 surrounds the outer circumference of the spring guide post 8; the spring guide post 8 has its own telescopic function, and the telescopic stroke of the spring guide post 8 is greater than the stroke of the piston 4. The total length of the spring guide post 8 in the maximum length state is greater than the total length of the spring in the free state; the two ends of the spring guide post 8 are movably assembled in the grooves on the end surfaces of the left end cover 1 and the piston 4, so that the radial freedom of the spring guide post 8 in the piston rod 5 is locked. The shape of the spring when it is not under tension or pressure is as follows Figure 2 shown.

[0028] The sealing ring assembly, such as Figure 3 As shown, it includes: a left dynamic sealing ring 6, a right dynamic sealing ring 61, a piston sealing ring 63, a left static sealing ring 64 and a right static sealing ring 65; among them, the left dynamic sealing ring 6 is located in the fitting gap between the left end cover 1 and the piston rod 5, the right dynamic sealing ring 61 is located in the fitting gap between the right end cover 2 and the piston rod 5, the piston sealing ring 63 is located in the fitting gap between the piston 4 and the cylinder 3, the left static sealing ring 64 is located in the fitting gap between the left end cover 1 and the cylinder 3, and the right static sealing ring 65 is located in the fitting gap between the right end cover 2 and the cylinder 3.

[0029] The cross-sectional area of ​​the right dynamic sealing ring 61 is larger than that of the left dynamic sealing ring 6. On the one hand, the service life of the right dynamic sealing ring 61 is improved. On the other hand, the right dynamic sealing ring 61 with a larger cross-sectional area provides a greater rebound force, which can provide better support force during the movement of the piston rod 5 and ensure smooth movement of the piston.

[0030] The left dynamic seal ring 6, the right dynamic seal ring 61, and the piston seal ring 63 are made of polyurethane, while the left static seal ring 64 and the right static seal ring 65 are made of silicone rubber. Polyurethane seal rings have excellent toughness and wear resistance, as well as good chemical stability, which can ensure that the valve maintains its sealing performance during long-term operation.

[0031] The valve assembly includes: a valve core 9, a valve core positioning bolt 91 and a flow stabilizer 11; the flow stabilizer 11 is fixedly connected to the right end cover 2, and the flow stabilizer 11 is provided with a valve core 9, a valve core positioning bolt 91 and a flow stabilizer 11 on the side facing the liquid outlet 13. Figure 2 and Figure 3 The rectifier curved surface shown in the cross-sectional view plays a role in stabilizing the outflow of the fluid stream. The valve core 9 is fixedly connected to the flow stabilizer 11 through the valve core positioning bolt 91. The valve core 9 is made of wear-resistant rubber or polytetrafluoroethylene.

[0032] The working principle of the utility model device:

[0033] Open the valve. Open inlet and outlet port A15 and simultaneously supply compressed air to inlet and outlet port B16 at a pressure of 0.1-0.3 MPa. Driven by the high-pressure air in the right chamber of the cylinder module, piston 4 overcomes the force of coil spring 7 and moves 0.5-2 mm to the left. As a result, piston rod 5 disengages from the valve assembly, and the valve opens. The degree of opening is controlled by the excess air pressure.

[0034] Close the valve; stop supplying compressed air to the inlet and exhaust port B16, the piston 4 returns to its initial position under the elastic force of the coil spring 7, the piston rod 5 contacts the valve assembly, and the valve is in a closed state; in order to improve the reliability of the valve closing state, supply compressed air to the inlet and exhaust port A15 with an air supply pressure of 0.1-0.3Mpa; therefore, the contact pressure between the piston rod 5 and the valve assembly increases.

[0035] The beneficial effects of the embodiment include: the structure of the valve is more compact by controlling the opening and closing of the liquid transmission path coaxially with the cylinder; the cylinder piston is automatically reset by the surrounding spiral spring, improving the safety of the gate valve; the front end of the valve assembly is made of wear-resistant material, and the rear end of the valve assembly is provided with a flow stabilizer, ensuring that the fluid pressure loss through the valve is small and the flow rate is stable; the valve housing module is provided with surrounding tensioning studs, and the tensioning studs on the same side are locked by the flange plate, improving the overall pressure bearing and sealing performance of the valve; the device parts are easy to process and assemble, and the manufacturing and maintenance cost is low.

[0036] The relative arrangement of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship for the convenience of description. The technology, methods and equipment known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and equipment should be considered as part of the authorized description. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper", etc. can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0038] In the description of the utility model, need understanding is, the orientation word such as " before, after, top, bottom, left, right " " horizontal, vertical, perpendicular, horizontal " and " top, bottom " and so on indicated orientation or positional relationship usually is based on the orientation or positional relationship shown in drawing, just is for the convenience of describing the utility model and simplifying description, under the condition of not making opposite statement, these orientation words do not indicate and suggest the device or element indicated must have a particular orientation or with a particular orientation structure and operation, therefore can not be understood as the restriction of the protection scope of the utility model;The orientation word " inside, outside " refers to the inside and outside relative to the outline of each component.

[0039] The above only for the preferred embodiment of the utility model has, and does not for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A long-life pneumatic combination valve, characterized by: Including valve housing module, cylinder module, sealing ring assembly and valve assembly; The valve housing module comprises a left end cover (1), a right end cover (2), a cylinder (3), a liquid inlet (12), a liquid outlet (13), an air inlet and outlet A (15), an air inlet and outlet B (16) and a tensioning stud (10); the left end cover (1) and the right end cover (2) are fixedly mounted on the left and right sides of the cylinder (3), respectively; the liquid inlet (12) and the liquid outlet (13) are respectively located on the left end cover (1) and the right end cover (2); the air inlet and outlet A (15) and the air inlet and outlet B (16) are both located on the side of the cylinder (3), wherein the air inlet and outlet A (15) is communicated with the left chamber of the cylinder module; the air inlet and outlet B (16) is communicated with the right chamber of the cylinder module; the threads at both ends of the tensioning stud (10) are respectively connected to the left end cover (1) and the right end cover (2); The cylinder module comprises a cylinder barrel (3), a piston (4), a piston rod (5), a coil spring (7) and a spring guide column (8); the piston rod (5) is a hollow tubular structure, and the piston (4) is coaxially and fixedly mounted on the outer circumference of the piston rod (5); the left end cover (1), the cylinder barrel (3) and the piston (4) together form a left chamber of the cylinder module; the right end cover (2), the cylinder barrel (3) and the piston (4) together form a right chamber of the cylinder module; one end of the coil spring (7) is in contact with the left end cover (1), and the other end is in contact with the end face of the piston (4); the coil spring (7) and the spring guide column (8) are arranged in pairs, and the coil spring (7) surrounds the outer circumference of the spring guide column (8); The valve assembly comprises a valve core (9), a valve core positioning bolt (91) and a flow stabilizer (11); the flow stabilizer (11) is fixedly connected to the right end cover (2), and the flow stabilizer (11) is provided with a rectifying curved surface on the side facing the liquid outlet (13); the valve core (9) is fixedly connected to the flow stabilizer (11) via the valve core positioning bolt (91); the valve core (9) is made of wear-resistant rubber or polytetrafluoroethylene.

2. A long-life pneumatic combination valve according to claim 1, characterized in that: The spring guide column (8) itself has a telescopic function; the telescopic stroke of the spring guide column (8) is greater than the stroke of the piston (4), and the total length of the spring guide column (8) in the maximum length state is greater than the total length of the coil spring (7) in the free state; the two ends of the spring guide column (8) are located in the end surface grooves of the left end cover (1) and the piston (4).

3. The long-life pneumatic combination valve according to claim 1, characterized in that: The number of the coil springs (7) is greater than one, and they are evenly arranged in the circumferential direction of the axis of the piston rod (5); the number of the tensioning studs (10) is four, and they are distributed around the outside of the valve housing module.

4. The long-life pneumatic combination valve according to claim 1, characterized in that: The sealing ring assembly comprises a left dynamic sealing ring (6), a right dynamic sealing ring (61), a piston sealing ring (63), a left static sealing ring (64) and a right static sealing ring (65); the left dynamic sealing ring (6) is located in the fitting gap between the left end cover (1) and the piston rod (5), the right dynamic sealing ring (61) is located in the fitting gap between the right end cover (2) and the piston rod (5), the piston sealing ring (63) is located in the fitting gap between the piston (4) and the cylinder (3), the left static sealing ring (64) is located in the fitting gap between the left end cover (1) and the cylinder (3), and the right static sealing ring (65) is located in the fitting gap between the right end cover (2) and the cylinder (3).

5. The long-life pneumatic combination valve according to claim 4, characterized in that: The cross-sectional area of ​​the right dynamic sealing ring (61) is greater than the cross-sectional area of ​​the left dynamic sealing ring (6); the left dynamic sealing ring (6), the right dynamic sealing ring (61) and the piston sealing ring (63) are made of polyurethane, and the left static sealing ring (64) and the right static sealing ring (65) are made of silicone rubber.

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