Pneumatic valve

Abstract

The utility model relates to the technical field of valves, and provides a pneumatic valve which comprises a valve body, a cut-off opening is formed in a fluid channel in the valve body, a valve element is arranged at the cut-off opening, the valve element is connected with a valve rod, the valve rod enables the valve element to close or open the cut-off opening under the action of an elastic piece, and the pneumatic valve further comprises an installation cylinder fixedly connected with the valve body; the force-bearing sliding block is arranged at the outer end of the valve rod and is in sliding connection with the mounting cylinder; one end of the bourdon tube is fixedly arranged on the mounting cylinder and communicated with the driving gas pipeline, the other end of the bourdon tube is closed and movably arranged, and when the gas pressure in the bourdon tube is gradually increased, the bending degree of the bourdon tube can be changed, the force bearing sliding block is extruded, the valve rod is promoted to drive the valve element to move, and the cut-off opening is closed or opened. The driving device can be suitable for occasions with large driving gas pressure.

Description

Technical Field

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

[0002] A pneumatic valve is a valve that is opened or closed by gas drive. In the prior art, for example, the patent with the announcement number "CN219035580U" applied by the applicant provides a cryogenic valve driven by oxygen. By introducing gas into the expansion joint, the volume of the expansion joint changes, thereby squeezing the valve stem to cause the valve to open or close.

[0003] However, the above method has at least the following defects: the pressure bearing capacity of the expansion joint is poor. When the valve is used in situations where the driving gas pressure is relatively high, the expansion joint is easily damaged, resulting in valve failure. Therefore, how to provide a pneumatic valve that can be used in situations where the driving gas pressure is relatively high is a technical problem that needs to be urgently solved in this field. Utility Model Content

[0004] The utility model aims to provide a pneumatic valve suitable for occasions where the driving gas pressure is relatively high.

[0005] The utility model is realized by the following technical solutions:

[0006] A pneumatic valve comprises a valve body, a fluid passage in the valve body is provided with a cut-off opening, a valve core is provided at the cut-off opening, the valve core is connected to a valve stem, and the valve stem closes or opens the cut-off opening under the action of an elastic member, and also comprises:

[0007] An installation cylinder fixedly connected to the valve body;

[0008] A load-bearing slider, which is disposed at the outer end of the valve stem and is slidably connected to the mounting tube; and

[0009] The spring tube is curved, one end of which is fixed on the mounting tube and connected to the driving gas pipeline, and the other end is closed and movably arranged. When the air pressure in the spring tube gradually increases, the curvature of the spring tube can change and squeeze the load-bearing slider, prompting the valve stem to drive the valve core to move, closing or opening the cut-off port.

[0010] Optionally, a manual screw is threadedly connected to the installation cylinder, so that the manual screw can squeeze the load-bearing slider to prompt the valve stem to drive the valve core to close the cut-off port.

[0011] Optionally, an extrusion cylinder is slidably arranged in the installation cylinder, the manual screw is located between the manual screw and the load-bearing sliding block, the spring tube is placed in the extrusion cylinder, and an escape opening for evading the spring tube is provided on one side of the extrusion cylinder.

[0012] Optionally, a cross section of the spring tube perpendicular to the center line is a rectangular structure.

[0013] Optionally, the length and width of the rectangular structure are not equal, and the length direction thereof is perpendicular to the rotation plane of the spring tube.

[0014] Optionally, an air nozzle is fixedly provided on the mounting tube, and the fixed end of the spring tube is connected to the air nozzle.

[0015] Optionally, the load-bearing sliding block is provided with a limit platform for limiting the maximum displacement of the load-bearing sliding block.

[0016] Optionally, a piezoelectric sensor is provided on the spring tube.

[0017] The technical solution of the utility model has at least the following advantages and beneficial effects: in the utility model, a spring tube is provided to convert the pressure of the driving gas into a change in the curvature of the spring tube, so that the spring tube squeezes the valve stem, thereby realizing the opening or closing of the valve. It can be seen that the utility model proposes a new driving method. Compared with the method of realizing the opening and closing of the valve by changing the volume of the expansion joint through driving gas in the prior art, the volume of the spring tube does not change, but the curvature changes. The driving gas pressure that can be adapted is much greater than that of the expansion joint, and it can be suitable for occasions with larger driving pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a pneumatic valve provided in Example 1 (valve open state);

[0020] Figure 2 A schematic diagram of the structure of a pneumatic valve provided in Example 1 (valve closed state);

[0021] Figure 3 A schematic diagram of the structure of a pneumatic valve provided in Example 2 (valve open state);

[0022] Icon: 1-valve body, 101-cut-off port, 2-valve stem, 3-valve core, 4-elastic part, 5-mounting cylinder, 6-load-bearing slider, 601-limiting platform, 7-spring tube, 8-air nozzle, 9-manual screw, 10-mounting plate, 1001-locking nut, 11-extrusion cylinder, 12-piezoelectric sensor. DETAILED DESCRIPTION

[0023] Embodiment 1

[0024] The present embodiment provides a gas driving method for a valve, which is applied to a valve that realizes valve opening and closing by moving a valve stem 2. A curved spring tube 7 is arranged at the outer end of the valve stem 2, and one end of the spring tube 7 is fixed and the other end is movable and closed. The fixed end of the spring tube 7 is connected to the driving gas pipeline. When the valve is used, the driving gas enters the spring tube 7, and the air pressure inside the spring tube 7 gradually increases, so that the curvature of the spring tube 7 changes and squeezes the outer end of the valve stem 2, thereby driving the valve stem 2 to move and open or close the valve. It can be seen that the utility model proposes a new driving method. Compared with the method in the prior art that the valve is opened and closed by changing the volume of the expansion joint by driving gas, the volume of the spring tube 7 does not change, but the curvature changes. The driving gas pressure that can be adapted is much greater than that of the expansion joint, and it can be suitable for occasions with larger driving pressure.

[0025] Embodiment 2

[0026] refer to Figure 1 and Figure 2 , this embodiment provides a pneumatic valve, which is driven by the gas driving method improved in the embodiment. The pneumatic valve includes a valve body 1, a fluid channel in the valve body 1 is provided with a cut-off port 101, a valve core 3 is provided at the cut-off port 101, and the valve core 3 is connected to a valve stem 2. The valve stem 2 closes or opens the cut-off port 101 under the action of an elastic member 4 (preferably a spring). In this embodiment, the fluid flows from the left end to the right end in the figure. The valve core 3 is arranged above the cut-off port 101 in the figure, and the valve stem 2 moves the valve core 3 away from the cut-off port 101 under the action of the elastic member 4, and the valve is normally open. It is explained as an example. It should be understood that in other embodiments, the valve core 3 can of course be arranged below the cut-off port 101 in the figure. The valve stem 2 closes the cut-off port 101 under the action of the elastic member 4, and the valve is normally closed.

[0027] On the basis of the above, the pneumatic valve further includes a mounting tube 5, a load-bearing slider 6 and a spring tube 7. The mounting tube 5 is fixedly connected to the valve body 1, for example, the mounting tube 5 is connected to the valve body 1 by bolts (not shown), the load-bearing slider 6 is arranged at the outer end of the valve stem 2 and is slidably connected to the mounting tube 5, the spring tube 7 is curved, for example, a C-shaped structure, one end of the spring tube 7 is fixedly arranged on the mounting tube 5 and connected to the driving gas pipeline, specifically, the mounting tube 5 is fixedly provided with a gas nozzle 8, the fixed end of the spring tube 7 is connected to the gas nozzle 8, and the other end of the spring tube 7 is closed and movably arranged.

[0028] On the basis of the above, when the air pressure in the spring tube 7 increases, the curvature of the spring tube 7 will change, which is equivalent to the movable end of the spring tube 7 rotating around the fixed end. In this way, the spring tube 7 can squeeze the load-bearing slider 6, prompting the valve stem 2 to drive the valve core 3 to move downward, and the valve core 3 closes the cut-off port 101, and the valve switches from the normally open state to the closed state (such as Figure 2As shown, it is worth noting that the curvature of the spring tube 7 in the figure is only a schematic diagram for easy viewing. In actual applications, the valve stem 2 can usually be moved within 5 mm to open and close the valve. Therefore, in actual applications, the curvature of the spring tube 7 does not change as much as shown in the figure).

[0029] As an option, the cross section of the spring tube 7 in this embodiment perpendicular to the center line is a rectangular structure. Further, the length and width of the rectangular structure are not equal, and its length direction is perpendicular to the rotation plane of the spring tube 7, so that Figure 1 For example, when the curvature of the spring tube 7 changes, the movable end of the spring tube 7 rotates around the fixed end, that is, the spring tube 7 rotates in the plane represented by the drawing. Therefore, in the rectangular cross-section of the spring tube 7 perpendicular to the center line, its length is perpendicular to the plane represented by the drawing, and its width is parallel to the plane represented by the drawing. The overall flat structure is arranged in this way to prevent the spring tube 7 from twisting in other directions, and ensure that the load-bearing slider 6 can be smoothly squeezed when the air pressure in the spring tube 7 increases.

[0030] It is easy to understand that the spring tube 7 has a certain elastic deformation ability, and can restore the deformation after the internal pressure is reduced. In practical applications, as an option, the spring tube 7 is preferably made of copper alloy to ensure strength while having good elastic deformation ability. Of course, in other embodiments, the spring tube 7 can also be made of other materials.

[0031] The load-bearing slider 6 is provided with a limit platform 601 for limiting the maximum displacement of the load-bearing slider 6 to prevent the valve stem 2 from being subjected to unlimited squeezing force when the driving pressure increases, that is, to prevent the valve core 3 from being squeezed beyond its bearing capacity and causing damage.

[0032] Embodiment 3

[0033] refer to Figure 3 This embodiment is further optimized on the basis of the second embodiment. In this embodiment, the installation cylinder 5 is connected with a manual screw rod 9 by threading. Specifically, the installation cylinder 5 is connected with a mounting plate 10 by bolts. A locking nut 1001 is welded on the top of the mounting plate 10. The manual screw rod 9 is connected with the locking nut 1001. In this way, by twisting the manual screw rod 9 to squeeze the load-bearing slider 6, the valve stem 2 can be driven to close the valve, that is, the manual disconnection of the valve is realized, which is convenient for emergency operation. Furthermore, an extrusion cylinder 11 is slidably arranged in the installation cylinder 5, and the manual screw rod 9 is located between the manual screw rod 9 and the load-bearing slider 6. That is, during manual operation, the manual screw rod 9 abuts against the top of the extrusion cylinder 11, and the extrusion cylinder 11 squeezes the load-bearing slider 6.

[0034] On the basis of the above, the air nozzle 8 of this embodiment is arranged on the side of the installation tube 5, the spring tube 7 is placed in the extrusion tube 11, and a bypass port for avoiding the spring tube 7 is provided on one side of the extrusion tube 11. During installation, the spring tube 7 is also placed into the extrusion tube 11 from the bypass port.

[0035] In this embodiment, a piezoelectric sensor 12 is further provided on the spring tube 7. In practical applications, the piezoelectric sensor 12 can also be connected to a display device to facilitate digital display of the driving gas pressure, that is, to facilitate visualization of the driving gas pressure.

[0036] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pneumatic valve, comprising a valve body (1), a fluid passage in the valve body (1) being provided with a cut-off opening (101), a valve core (3) being provided at the cut-off opening (101), the valve core (3) being connected to a valve stem (2), the valve stem (2) causing the valve core (3) to close or open the cut-off opening (101) under the action of an elastic member (4), characterized in that: Also includes: A mounting cylinder (5) is fixedly connected to the valve body (1); A load-bearing slider (6) is disposed at the outer end of the valve stem (2) and is slidably connected to the mounting tube (5); and A spring tube (7) is in a curved shape, one end of which is fixedly mounted on a mounting tube (5) and connected to a driving gas pipeline, and the other end of which is closed and movably arranged. When the gas pressure in the spring tube (7) gradually increases, the curvature of the spring tube (7) can change and squeeze the load-bearing slider (6), thereby prompting the valve stem (2) to drive the valve core (3) to move, thereby closing or opening the cut-off port (101).

2. The pneumatic valve according to claim 1, characterized in that: A manual screw rod (9) is threadedly connected to the installation cylinder (5), so that the manual screw rod (9) can squeeze the load-bearing slider (6) to prompt the valve stem (2) to drive the valve core (3) to close the cut-off port (101).

3. The pneumatic valve according to claim 2, characterized in that: An extrusion cylinder (11) is slidably arranged in the installation cylinder (5), a manual screw rod (9) is located between the manual screw rod (9) and the load-bearing sliding block (6), a spring tube (7) is placed in the extrusion cylinder (11), and a clearance opening for evading the spring tube (7) is provided on one side of the extrusion cylinder (11).

4. The pneumatic valve according to any one of claims 1 to 3, characterized in that: The cross section of the spring tube (7) perpendicular to the center line is in a rectangular structure.

5. The pneumatic valve according to claim 4, characterized in that: The length and width of the rectangular structure are not equal, and the length direction is perpendicular to the rotation plane of the spring tube (7).

6. The pneumatic valve according to any one of claims 1 to 3, characterized in that: An air nozzle (8) is fixedly arranged on the mounting tube (5), and the fixed end of the spring tube (7) is communicated with the air nozzle (8).

7. The pneumatic valve according to any one of claims 1 to 3, characterized in that: The load-bearing sliding block (6) is provided with a limiting platform (601) for limiting the maximum displacement of the load-bearing sliding block (6).

8. The pneumatic valve according to any one of claims 1 to 3, characterized in that: A piezoelectric sensor (12) is provided on the spring tube (7).

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