Air quick valve

Abstract

The invention relates to the technical field of quick valves, in particular to an air quick valve which comprises a valve body, a valve seat and a valve element, a valve cavity is formed in the valve body, the valve body comprises a shell and an installation island located in the valve cavity, the installation island is connected with the shell into a whole through an upper connecting part and a lower connecting part, and the air quick valve further comprises a first cylinder body installed on the shell; a stepped hole is formed in the mounting island, or a containing cavity is formed in the mounting island, gas is input into the first cavity and the fourth cavity through an external gas source, and the gas directly enters the first cavity and acts on the first piston; when the valve is opened, the gas source does not supply gas, the valve element is driven to move through the acting force of a medium on the valve element, the valve element is driven to move through the acting force of the medium on the valve element, and the valve element is driven to move through the acting force of the medium on the valve element. And the first piston and the second piston are enabled to move in the stepped hole.

Description

Technical Field

[0001] The invention relates to the technical field of quick valves, in particular to an air quick valve. Background Art

[0002] In recent years, the development and production of wind tunnels have become more and more extensive. Wind tunnels are the most widely used tools in aerodynamic research and testing. The use of fast valves is even more critical. Due to the rapid opening and closing, high-frequency and high-pressure gas medium, the valves move relative to each other and the wear of moving parts is aggravated. In addition, the existing valves use a floating ball structure with a large torque. On the one hand, the valve core is prone to collision during operation, causing damage to the valve body, valve seat and valve core, greatly reducing the service life of the valve, increasing the number of maintenance times, and increasing the overall operating cost of the wind tunnel. On the other hand, pneumatic actuators occupy a large space and cannot be used in places with restricted environments, reducing the applicability of fast valves. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem that the existing fast valve has a large torque and the valve core is prone to collision during operation due to rapid opening and closing, causing damage to the valve body, valve seat and valve core, greatly reducing the service life of the valve, increasing the number of maintenance times, and increasing the overall operating cost of the wind tunnel, an air fast valve is now provided.

[0004] The technical solution adopted by the present invention to solve its technical problem is: an air quick valve, including a valve body, a valve seat and a valve core, wherein a valve cavity is arranged in the valve body, the valve body includes a shell and an installation island located in the valve cavity, the installation island is connected to the shell through an upper connecting part and a lower connecting part, and also includes a first cylinder body installed on the shell, the installation island is provided with a stepped hole; or an accommodating cavity is provided on the installation island, a second cylinder body matching with the first cylinder body is installed in the accommodating cavity, the second cylinder body has a stepped hole, the stepped hole is arranged along the displacement direction of the valve core, a piston rod is arranged in the stepped hole, the valve core is installed at one end of the piston rod, and the other end of the piston rod is provided with a stepped hole corresponding to the stepped hole. A first piston and a second piston matching the stepped hole, the first piston and the second piston both slide in cooperation with the stepped hole, the first piston cooperates with the bottom hole of the stepped hole to form a first cavity, a second cavity is formed between the first piston, the second piston and the stepped hole, the front of the stepped hole is connected to the valve cavity, a third piston matching it is slidably arranged in the first cylinder body, the third piston divides the first cylinder body into a third cavity and a fourth cavity separated from each other, the third cavity is connected to the first cavity, the third cavity and the first cavity are filled with a medium, the second cavity and the fourth cavity are both connected to an external gas source, and the valve seat is detachably mounted on the valve body at the medium input end. Compared with the prior art, the present invention inputs gas into the second cavity and the fourth cavity respectively through an external gas source, and the gas directly enters the first cavity and acts on the first piston. The gas in the fourth cavity acts on the third piston and squeezes the medium from the third cavity into the second cavity. The medium acts on the second piston to quickly drive the valve core to move toward the valve seat, close the valve, reduce the torque, and the valve has a short rapid response time and fast action, and there is no need to install an actuator with a large torque. When the valve is opened, the gas source does not supply gas, and the valve core is driven to move by the force of the medium on the valve core, and the first piston and the second piston are displaced in the stepped hole. The hydraulic oil in the second cavity enters the third cavity, which plays a buffering role on the valve core, effectively preventing the valve core from moving too fast and hitting the valve body, ensuring that the valve is stable and reliable in operation, reducing the number of maintenance times of the valve body, and ensuring the service life of the valve. At the same time, the first cavity and the fourth cavity are located inside the valve body, which greatly reduces the occupied space.

[0005] In order to reduce the flow resistance of the fluid in the valve cavity, some preferred embodiments are that a flow guide cover is installed at one end of the mounting island away from the valve core, and the inner wall of the shell and the outer walls of the mounting island and the flow guide cover are all smooth surfaces and form a streamlined flow channel. The streamlined outer wall of the mounting island, the streamlined valve cavity and the flow guide cover form a low flow resistance structure. The low flow resistance structure effectively extends the service life of the valve, ensures smooth flow of the medium, reduces damage to vulnerable parts, does not shorten the maintenance cycle, and ensures stable and reliable operation of the valve body.

[0006] In some preferred embodiments, the second cylinder body is detachably mounted on the mounting island.

[0007] Considering that it is difficult to directly process the stepped hole in the valve cavity of the valve body and the processing efficiency is low, some embodiments are preferably implemented in which the second cylinder body is detachably mounted on the mounting island. A receiving cavity is provided in the valve body, and the second cylinder body is mounted in the receiving cavity. The split mounting structure greatly reduces the processing difficulty of the valve body. By detachably mounting the valve seat at the input end of the valve cavity, the valve body does not need to be completely disassembled. The valve seat can be maintained by only disassembling the pipeline at one end of the valve body or the valve body.

[0008] In order to prevent the medium in the valve cavity from entering between the first cavity and the second cavity, in some preferred embodiments, sealing rings are provided between the first piston and the first cavity and between the second piston and the second cavity.

[0009] In some preferred embodiments, the accommodating cavity extends outward from the valve body and penetrates the outer surface of the valve body, an end cover of the accommodating cavity located on the outer surface of the valve body is provided with an upper cover plate, and the first cylinder body is provided on the upper cover plate.

[0010] In order to better control the speed of the action of the valve core, in some preferred embodiments, the valve body is provided with an adjustment mechanism for adjusting the flow of the medium between the third cavity and the second cavity. The adjustment mechanism adjusts the flow of the hydraulic oil when flowing between the third cavity and the second cavity, controls the flow of the hydraulic oil entering or discharged from the third cavity or the second cavity, on the one hand controls the action speed of the valve core, and on the other hand ensures that the valve core buffer is stable and reliable.

[0011] In order to realize the adjustment mechanism, some preferred embodiments include an adjustment mechanism comprising an adjustment rod threadedly connected to the valve body, the valve body being provided with a first through hole and a second through hole interconnected, the first through hole and the second through hole interconnecting the third cavity and the first cavity, the adjustment rod being provided with a plurality of third through holes spaced apart along its axial direction, the porosity of the plurality of third through holes increasing from one end of the adjustment rod to the other end, one end of the adjustment rod being located between the first through hole and the second through hole, a part of the plurality of third through holes interconnecting the first through hole and the second through hole to adjust the flow rate of the medium flowing from the first cavity to the third cavity.

[0012] The beneficial effects of the present invention are as follows: when the air quick valve of the present invention is in use, gas is input into the first cavity and the fourth cavity respectively through an external gas source, the gas directly enters the first cavity and acts on the first piston, the gas in the fourth cavity acts on the third piston and squeezes the hydraulic oil from the third cavity into the second cavity, the hydraulic oil acts on the second piston, and the valve core is quickly driven to move toward the valve seat, the valve is closed, and the torque is reduced, while when the valve is opened, the gas source does not supply gas, the valve core is driven to move through the force of the medium on the valve core, and the first piston and the second piston are displaced in the stepped hole, the hydraulic oil in the second cavity enters the third cavity, It has a buffering effect on the valve core, effectively preventing the valve core from hitting the valve body due to excessive displacement, ensuring stable and reliable operation of the valve, reducing the maintenance times of the valve body, and ensuring the service life of the valve. At the same time, the valve has a short rapid response time and rapid action, and there is no need to install a high-torque actuator. At the same time, the first cavity and the fourth cavity are located inside the valve body, which greatly reduces the occupied space and avoids the problem that the existing fast valve has a large torque and the valve core is prone to collision during action due to rapid opening and closing, causing damage to the valve body, valve seat and valve core, greatly reducing the service life of the valve, increasing the maintenance times, and increasing the overall operating cost of the wind tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 It is a front view of the present invention;

[0016] Figure 3 It is a left side view of the present invention;

[0017] Figure 4 yes Figure 2 Middle AA section view;

[0018] Figure 5 yes Figure 4 A partial enlarged view of B in the middle;

[0019] Figure 6 yes Figure 4 A partial enlarged view of middle C;

[0020] Figure 7 yes Figure 3 Middle DD section view.

[0021] In the figure: 1, valve body, 101, valve cavity, 102, accommodating cavity, 2, valve seat, 3, valve core, 4, first cylinder body, 5, piston rod, 6, first piston, 7, second piston, 8, first cavity, 9, second cavity, 10, third piston, 11, third cavity, 12, fourth cavity, 13, mounting island, 14, second cylinder body, 1401, stepped hole, 15, sealing ring, 16, upper cover plate, 17, adjusting rod, 18, first through hole, 19, second through hole, 20, third through hole, 21, guide cover. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with embodiments:

[0023] The present invention is not limited to the following specific embodiments. A person skilled in the art can implement the present invention in various other specific embodiments according to the contents disclosed in the present invention, or any simple changes or modifications made to the design structure and ideas of the present invention fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0026] like Figure 1-7As shown, an air quick valve comprises a valve body 1, a valve seat 2, a valve core 3 and a first cylinder body 4. The valve body 1 is provided with a valve cavity 101 through which a medium passes. The valve body 1 comprises a shell and an installation island 13 located in the valve cavity 101. The installation island 13 is connected to the shell through an upper connecting portion and a lower connecting portion. The valve core 3 and the valve seat 2 are relatively arranged in the valve cavity 101. The first cylinder body 4 is fixed on the shell of the valve body 1. The installation island 13 is provided with a stepped hole 1401, or the installation island The valve body 13 is provided with an accommodating chamber 102, in which a second cylinder body 14 matching the second cylinder body 14 is installed, and the second cylinder body 14 has a stepped hole 1401, which is a blind hole. The stepped hole 1401 is located in the valve cavity 101 and is arranged along its axial direction, so that the stepped hole 1401 is arranged along the displacement direction of the valve core 3, and the aperture of the stepped hole 1401 gradually decreases from the outside to the inside, that is, the stepped hole 1401 has two sections, one of which is close to the opening end and has a large diameter, and the other is close to the opening end and has a large diameter. A section with a small diameter is provided on the valve core 3. A first piston 6 and a second piston 7 matching the stepped hole 1401 are provided at one end of the piston rod 5. The first piston 6 and the second piston 7 are both slidably arranged in the stepped hole 1401. The first piston 6 is located at the bottom hole position of the stepped hole 1401 to cooperate and form a first cavity 8. A second cavity 9 is formed between the first piston 6, the second piston 7 and the stepped hole 1401. The front part of the stepped hole 1401 is connected to the valve cavity 101. A third piston 10 matching it is slidably arranged in the first cylinder body 4. The third piston 10 divides the first cylinder body 4 into a third cavity 11 and a fourth cavity 12 separated from each other. The third cavity 11 is connected to the first cavity 8. A medium is arranged in the third cavity 11 and the first cavity 8. In this embodiment, the medium is hydraulic oil. The second cavity 9 and the fourth cavity 12 are both connected to an external air source. The valve seat 2 is detachably mounted on the end of the valve cavity 101 located at the medium input.

[0027] A flow guide cover 21 is installed at the end of the installation island 13 away from the valve core 3. The inner wall of the shell and the outer walls of the installation island 13 and the flow guide cover 21 are all smooth surfaces and form a streamlined flow channel. In this embodiment, the installation island 13 is larger in the middle and smaller at both ends along the axial direction of the valve cavity 101. The cross-sectional area of ​​the valve cavity 101 gradually increases from the input end to the output end. The inner circumferential wall of the valve cavity 101 is streamlined from the input end to the output end. The outer surface of the flow guide cover 21 is also a conical surface and streamlined. The contact surface between the valve core 3 and the valve seat 2 is a conical surface. The front and rear conical surfaces of the fluid flow cooperate to avoid unstable turbulence caused by high-pressure fluid in the inner cavity of the valve body 1. The valve seat 2 and the sleeve are fixed at the entrance of the valve cavity 101 to reduce the impact of the fluid.

[0028] The second cylinder body 14 is detachably mounted on the mounting island 13 by means of screws. A sealing ring 15 is provided between the first piston 6 and the first cavity 8 and between the second piston 7 and the second cavity 9 .

[0029] The accommodating chamber 102 extends outward from the valve body 1 and penetrates the outer surface of the valve body 1 . An end of the accommodating chamber 102 located on the outer surface of the valve body 1 is covered with an upper cover plate 16 , and the first cylinder body 4 is disposed on the upper cover plate 16 .

[0030] The valve body 1 is provided with an adjusting mechanism for adjusting the flow rate of the medium between the third cavity 11 and the second cavity 9. The adjusting mechanism includes an adjusting rod 17 threadedly connected to the upper cover plate 16. The upper cover plate 16 is provided with a first through hole 18 and a second through hole 19 which are connected to each other. The first through hole 18 and the second through hole 19 connect the third cavity 11 and the second cavity 9 to each other. The adjusting rod 17 is provided with a plurality of third through holes 20 at intervals along its axial direction. The porosity of the third through hole 20 increases from one end of the adjusting rod 17 to the other end. One end of the adjusting rod 17 is located between the first through hole 18 and the second through hole 19. A part of the plurality of third through holes 20 connects the first through hole 18 and the second through hole 19 to adjust the flow rate of the medium flowing from the first cavity 8 to the third cavity 11.

[0031] The third cavity 11 and the second cavity 9 are connected to each other through a pipeline, and the second cavity 9 is used for buffering the valve core 3 when the valve is opened.

[0032] The cross-sectional area of ​​the first piston 6 is smaller than the cross-sectional area of ​​the second piston 7 , and the second piston 7 is located between the valve core 3 and the first piston 6 .

[0033] A limit shoulder is provided at one end of the valve seat 2, and a mounting hole is provided at one end of the valve body 1 located in the valve cavity 101, the mounting hole and the limit shoulder match, the valve seat 2 is arranged in the valve cavity 101, and the limit shoulder is arranged in the mounting hole, the valve seat 2 and the valve body 1 are fixedly connected to each other by screws, so that the valve seat 2 can be detachably installed at the end of the valve cavity 101 located at the medium input, and at the same time, the valve seat 2 and the valve core 3 are sealed with a soft sealing valve trim design, when the valve is closed, an elastic O-ring is fixed to the polytetrafluoroethylene plate through a metal support block, the valve core 3 and the polytetrafluoroethylene plate contact and squeeze the O-ring, exerting force on the O-ring and causing deformation, so as to realize the soft sealing between the valve core 3 and the valve seat 2, reduce the possibility of gas leakage, and fit more closely, the material of the polytetrafluoroethylene plate is polytetrafluoroethylene, which is a polymer material with high hardness and mechanical strength, and good resilience, small deformation under multiple actions, which can greatly improve the life of the valve.

[0034] When the above-mentioned air quick valve is in use, when the valve is closed, the external air source delivers gas to the first cavity 8 and the fourth cavity 12 respectively, the gas enters the first cavity 8 and acts on the first piston 6, the gas enters the fourth cavity 12 and acts on the third piston 10, the third piston 10 is displaced in the first cylinder 4, and the hydraulic oil in the third cavity 11 flows into the second cavity 9 through the first through hole 18 and the second through hole 19 through the pipeline. At the same time, after passing through the first through hole 18, the hydraulic oil flows into the second through hole 19 through the third through hole 20 on the adjusting rod 17. Since the adjusting rod 17 is threadedly connected to the upper cover plate 16, rotating the adjusting rod 17 makes the third through hole 20 of different diameters connect the first through hole 18 and the second through hole 19, so that the hydraulic oil acts on the second piston 7. The dual action drives the valve core 3 to move toward the valve seat 2, so that the valve core 3 has a short response time and a rapid action.

[0035] When the valve is opened, the external air source does not provide gas, the valve inlet pressure increases, and the valve core 3 moves backward under the thrust of the medium. The hydraulic oil in the second cavity 9 enters the third cavity 11 through the pipeline, the second through hole 19, the third through hole 20 and the first through hole 18. The third piston 10 is displaced in the first cylinder 4, and the gas in the fourth cylinder is discharged. Due to the action of the adjusting rod 17, the hydraulic oil in the second cavity 9 has a certain buffering effect on the valve core 3 to prevent the valve core 3 and the valve seat 2 from colliding with each other. At the same time, rotating the adjusting rod 17 can make the third through hole 20 of different diameters connect the first through hole 18 and the second through hole 19, thereby changing the flow area of ​​the hydraulic oil.

[0036] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An air quick valve, comprising a valve body (1), a valve seat (2) and a valve core (3), wherein a valve cavity (101) is provided in the valve body (1), the valve body (1) comprises a shell and a mounting island (13) located in the valve cavity (101), the mounting island (13) being connected to the shell via an upper connecting portion and a lower connecting portion, characterized in that: The invention also comprises a first cylinder body (4) mounted on the housing, the mounting island (13) being provided with a stepped hole (1401); or the mounting island (13) being provided with a receiving chamber (102), a second cylinder body (14) matching the first cylinder body (14) being mounted in the receiving chamber (102), the second cylinder body (14) having a stepped hole (1401), the stepped hole (1401) being arranged along the displacement direction of the valve core (3), a piston rod (5) being arranged in the stepped hole (1401), the valve core (3) being mounted on one end of the piston rod (5), the other end of the piston rod (5) being provided with a first piston (6) and a second piston (7) matching the stepped hole (1401), the first piston (6) and the second piston (7) both being slidably matched with the stepped hole (1401), the first piston (1401) and the second piston (1401) being arranged in a sliding relationship. 6) cooperates with the bottom hole of the stepped hole (1401) to form a first cavity (8); a second cavity (9) is formed between the first piston (6), the second piston (7) and the stepped hole (1401); the front of the stepped hole (1401) is connected to the valve cavity (101); a third piston (10) matching with the first cylinder (4) is slidably arranged; the third piston (10) divides the first cylinder (4) into a third cavity (11) and a fourth cavity (12) separated from each other; the third cavity (11) is connected to the first cavity (8); the third cavity (11) and the first cavity (8) are filled with a medium; the second cavity (9) and the fourth cavity (12) are both connected to an external gas source; and the valve seat (2) is detachably mounted on the valve body (1) at the medium input end.

2. The air quick valve according to claim 1, characterized in that: A flow guide cover (21) is installed at one end of the installation island (13) away from the valve core (3), and the inner wall of the shell and the outer walls of the installation island (13) and the flow guide cover (21) are all smooth surfaces and form a streamlined flow channel.

3. The air quick valve according to claim 1, characterized in that: The second cylinder body (14) is detachably mounted on the mounting island (13).

4. The air quick valve according to claim 1, characterized in that: A sealing ring (15) is provided between the matching parts of the first piston (6), the second piston (7) and the mounting island (13) or between the matching parts of the first piston (6), the second piston (7) and the second cylinder body (14).

5. The air quick valve according to claim 1, characterized in that: The accommodating chamber (102) extends outward from the valve body (1) and penetrates the outer surface of the valve body (1); an end cover of the accommodating chamber (102) located on the outer surface of the valve body (1) is provided with an upper cover plate (16); and the first cylinder body (4) is arranged on the upper cover plate (16).

6. The air quick valve according to any one of claims 1 to 5, characterized in that: The valve body (1) is provided with a regulating mechanism for regulating the flow of the medium between the third cavity (11) and the second cavity (9).

7. The air quick valve according to claim 6, characterized in that: The regulating mechanism comprises an regulating rod (17) threadedly connected to the valve body (1); the valve body (1) is provided with a first through hole (18) and a second through hole (19) which are connected to each other; the first through hole (18) and the second through hole (19) connect the third cavity (11) and the first cavity (8) to each other; the regulating rod (17) is provided with a plurality of third through holes (20) spaced apart along its axial direction; the porosity of the plurality of third through holes (20) increases from one end of the regulating rod (17) to the other end; one end of the regulating rod (17) is located between the first through hole (18) and the second through hole (19); a part of the plurality of third through holes (20) connects the first through hole (18) and the second through hole (19) to adjust the flow rate of the medium flowing from the first cavity (8) to the third cavity (11).

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