Anti-backflow pneumatic stop valve

Abstract

An inlet pipe is fixedly installed at one end of a stop valve body, a discharge pipe is fixedly installed at the end, opposite to the inlet pipe, of the stop valve body, and a backflow preventing assembly for preventing backflow is arranged on the inner side of the discharge pipe. The backflow preventing assembly comprises a rotating main shaft rotationally connected to the inner side of the discharging pipe, a first semicircular plate rotationally connected with the rotating main shaft and a second semicircular plate rotationally connected with the rotating main shaft, an adjusting shell is fixedly installed on the periphery of the discharging pipe, and an adjusting plate is slidably connected to the inner side of the adjusting shell; an electric push rod for pushing the adjusting plate to slide is fixedly installed in the adjusting shell, and a rotating main shaft penetrates through the discharging pipe and is fixedly provided with a connecting block for driving the first semicircular plate to rotate. The first semicircular plate and the second semicircular plate in the discharge pipe can be conveniently opened or closed through the backflow prevention assembly, and the situation of backflow of a medium is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of stop valve equipment, in particular to an anti-backflow pneumatic stop valve. Background Art

[0002] A pneumatic stop valve is a valve that uses compressed air as a power source to control the opening and closing of the valve. It uses a pneumatic actuator (such as a cylinder) to operate the opening and closing of the valve, rather than manual or electric operation. Pneumatic stop valves are usually used in situations that require fast and frequent operations or work in dangerous environments.

[0003] Pneumatic stop valves are suitable for flammable and explosive environments because the pneumatic system does not rely on electricity. However, when the pneumatic stop valve is fully opened, if backflow occurs, it cannot be stopped in time, and convection is formed in the pipeline, hindering the flow of the medium. Summary of the invention

[0004] The purpose of the present invention is to provide a pneumatic stop valve with anti-backflow in order to solve the problem that pneumatic stop valves are suitable for flammable and explosive environments. Because the pneumatic system does not rely on electricity, when the pneumatic stop valve is fully opened, if backflow occurs, it cannot be stopped in time, convection is formed in the pipeline, and the flow of the medium is hindered.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a pneumatic stop valve for preventing backflow, comprising a stop valve body, one end of the stop valve body is fixedly installed with an inlet pipe, one end of the stop valve body and the end opposite to the inlet pipe is fixedly installed with a discharge pipe, an anti-backflow component for preventing backflow is arranged on the inner side of the discharge pipe, the anti-backflow component comprises a rotating main shaft rotatably connected to the inner side of the discharge pipe, a semicircular plate 1 rotatably connected to the rotating main shaft, and a semicircular plate 2 rotatably connected to the rotating main shaft, an adjusting shell is fixedly installed on the outer periphery of the discharge pipe, an adjusting plate is slidably connected to the inner side of the adjusting shell, an electric push rod for pushing the adjusting plate to slide is fixedly installed inside the adjusting shell, a connecting block that drives the semicircular plate 1 to rotate is fixedly installed on the rotating main shaft passing through the discharge pipe, and a connecting block that drives the semicircular plate 2 to rotate is also fixedly installed on the rotating main shaft passing through the outer periphery of the discharge pipe, an L-shaped connecting rod is fixedly installed on one end of the connecting block, and a through groove that penetrates the other end of the L-shaped connecting rod is provided on one end of the adjusting plate close to the L-shaped connecting rod.

[0006] As a further solution of the present invention: a sliding groove for sliding the adjusting plate is provided on the inner side of the adjusting shell, and the sliding groove is symmetrically provided at both ends of the adjusting shell, and sliding rods slidably matched with the sliding groove are symmetrically fixed at both ends of the adjusting plate.

[0007] As a further solution of the present invention: a limiting ring plate for resetting and limiting the semicircular plate 1 and the semicircular plate 2 is fixedly installed inside the discharge pipe.

[0008] As a further solution of the present invention: a mounting flange is fixedly mounted on one end of the discharge pipe, and the mounting flange is also fixedly mounted on one end of the inlet pipe.

[0009] As a further solution of the present invention: a valve seat is fixedly installed on the top of the stop valve body to facilitate the staff to adjust the size of the valve core opening.

[0010] As a further solution of the present invention: the valve seat is fixedly connected to the stop valve body by a threaded screw.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The present invention can conveniently open or close the semicircular plate 1 and the semicircular plate 2 inside the discharge pipe through the backflow prevention component to reduce the backflow of the medium;

[0013] 2. The limiting ring plate is used to limit the semicircular plate 1 and the semicircular plate 2 when they are closed, so as to reduce the situation of over-rotation when closing. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the regulating shell and the discharge pipe of the present invention;

[0016] Figure 3 It is a schematic diagram of the top cross-sectional structure of the regulating housing of the present invention;

[0017] Figure 4 The present invention Figure 3 A schematic diagram of the local enlarged structure at point A in the middle;

[0018] Figure 5 It is an enlarged structural schematic diagram of the semicircular plate 1 and the semicircular plate 2 of the present invention.

[0019] In the figure: 1. stop valve body; 2. inlet pipe; 3. outlet pipe; 4. valve seat; 5. mounting flange; 6. backflow prevention assembly; 61. rotating main shaft; 62. semicircular plate 1; 63. semicircular plate 2; 64. adjusting housing; 65. adjusting plate; 66. electric push rod; 67. connecting block; 68. L-shaped connecting rod; 69. through groove; 610. sliding groove; 611. sliding rod; 612. limit ring plate. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" 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 directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of an embodiment of the present invention based on the overall structure of the present invention.

[0022] Reference Figure 1 and Figure 5 In the embodiment of the present invention, the pneumatic stop valve for preventing backflow includes a stop valve body 1, an inlet pipe 2 is fixedly installed at one end of the stop valve body 1, a discharge pipe 3 is fixedly installed at one end of the stop valve body 1 and at the end opposite to the inlet pipe 2, and a backflow prevention component 6 for preventing backflow is arranged inside the discharge pipe 3. The backflow prevention component 6 includes a rotating main shaft 61 rotatably connected to the inside of the discharge pipe 3, a semicircular plate 1 62 rotatably connected to the rotating main shaft 61, and a semicircular plate 2 63 rotatably connected to the rotating main shaft 61. An adjusting shell 64 is fixedly installed on the outer periphery of the discharge pipe 3. The adjusting shell An adjusting plate 65 is slidably connected to the inner side of the shell 64, and an electric push rod 66 is fixedly installed inside the adjusting shell 64 to push the adjusting plate 65 to slide. The rotating main shaft 61 passes through the discharge pipe 3 and is fixedly installed with a connecting block 67 that drives the semicircular plate 1 62 to rotate. The rotating main shaft 61 passes through the outer periphery of the discharge pipe 3 and is also fixedly installed with a connecting block 67 that drives the semicircular plate 2 63 to rotate. An L-shaped connecting rod 68 is fixedly installed at one end of the connecting block 67. A through groove 69 that penetrates the other end of the L-shaped connecting rod 68 is opened at one end of the adjusting plate 65 close to the L-shaped connecting rod 68.

[0023] Through the implementation of this method: the rotating main shaft 61 is sealedly connected to the rotating part that passes through the discharge pipe 3, and the outer edges of the semicircular plate 1 62 and the semicircular plate 2 63 are in contact with the inner wall of the discharge pipe 3, and are sealed when closed. The semicircular plate 1 62 and the semicircular plate 2 63 inside the discharge pipe 3 can be easily opened or closed through the anti-backflow component 6 to reduce the backflow of the medium.

[0024] Reference Figure 1 and Figure 5 The inner side of the adjusting housing 64 is provided with a sliding groove 610 for the adjusting plate 65 to slide, and the sliding groove 610 is symmetrically provided at both ends of the adjusting housing 64, and sliding rods 611 symmetrically fixed at both ends of the adjusting plate 65 to slide with the sliding groove 610;

[0025] Through the implementation of this method: when the electric push rod 66 pushes the adjustment plate 65 to slide, the adjustment plate 65 can be limited by the sliding groove 610 and the sliding rod 611, thereby reducing the deviation during sliding.

[0026] Reference Figure 1 and Figure 5 A limiting ring plate 612 is fixedly installed inside the discharge pipe 3 for resetting and limiting the semicircular plate 1 62 and the semicircular plate 2 63;

[0027] Through the implementation of this method: the limiting ring plate 612 is used to limit the semicircular plate 1 62 and the semicircular plate 2 63 when they are closed, thereby reducing the situation of excessive rotation when closing.

[0028] Reference Figure 1 and Figure 5 A mounting flange 5 is fixedly installed at one end of the discharge pipe 3, and the mounting flange 5 is also fixedly installed at one end of the inlet pipe 2. A valve seat 4 is fixedly installed on the top of the stop valve body 1 to facilitate the staff to adjust the valve core opening size. The valve seat 4 is fixedly connected to the stop valve body 1 through a threaded screw.

[0029] The working principle of the present invention is: when the stop valve body 1 is used normally, the semicircular plate 1 62 and the semicircular plate 2 63 can be kept in an open state for normal use. When the circulating medium flows back, the staff starts the electric push rod 66, and the electric push rod 66 drives the adjustment plate 65 to slide inside the adjustment shell 64. When the adjustment plate 65 slides, the through groove 69 opened at one end of the adjustment plate 65 can drive the L-shaped connecting rod 68 to rotate inside the through groove 69. When the L-shaped connecting rod 68 rotates, it will drive the connecting block 67 to rotate together. Since the two groups of connecting blocks 67 are respectively connected to the semicircular plate 1 62 and the semicircular plate 2 63 through the rotating main shaft, when the connecting block 67 rotates, it will drive the semicircular plate 1 62 and the semicircular plate 2 63 to rotate and close inside the discharge pipe 3. At this time, the medium cannot flow back. The anti-backflow component 6 can facilitate the staff to open or close the semicircular plate 1 62 and the semicircular plate 2 63 inside the discharge pipe 3 to reduce the phenomenon of medium backflow.

[0030] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Anti-backflow pneumatic stop valve, characterized in that: The invention comprises a stop valve body (1), one end of which is fixedly mounted an inlet pipe (2), one end of which is fixedly mounted an outlet pipe (3), the inner side of which is opposite to the inlet pipe (2) is provided with an anti-backflow component (6) for preventing backflow, the anti-backflow component (6) comprising a rotating main shaft (61) rotatably connected to the inner side of the outlet pipe (3), a semicircular plate 1 (62) rotatably connected to the rotating main shaft (61), and a semicircular plate 2 (63) rotatably connected to the rotating main shaft (61), an adjusting shell (64) fixedly mounted on the outer periphery of the outlet pipe (3), the inner side of the adjusting shell (64) slidingly connected to the inner side of the adjusting shell (64) An adjusting plate (65) is connected, an electric push rod (66) for pushing the adjusting plate (65) to slide is fixedly installed inside the adjusting housing (64), the rotating main shaft (61) passes through the discharge pipe (3) and is fixedly installed with a connecting block (67) for driving the semicircular plate 1 (62) to rotate, and the rotating main shaft (61) passes through the outer periphery of the discharge pipe (3) and is also fixedly installed with a connecting block (67) for driving the semicircular plate 2 (63) to rotate, one end of the connecting block (67) is fixedly installed with an L-shaped connecting rod (68), and a through groove (69) that penetrates the other end of the L-shaped connecting rod (68) is opened on one end of the adjusting plate (65) close to the L-shaped connecting rod (68).

2. The anti-backflow pneumatic stop valve according to claim 1, characterized in that: The inner side of the adjusting shell (64) is provided with a sliding groove (610) for the adjusting plate (65) to slide, and the sliding groove (610) is symmetrically provided at two ends inside the adjusting shell (64), and sliding rods (611) slidably matched with the sliding groove (610) are symmetrically fixed at two ends of the adjusting plate (65).

3. The anti-backflow pneumatic stop valve according to claim 1, characterized in that: A limiting ring plate (612) for resetting and limiting the position of the first semicircular plate (62) and the second semicircular plate (63) is fixedly installed inside the discharge pipe (3).

4. The anti-backflow pneumatic stop valve according to claim 1, characterized in that: A mounting flange (5) is fixedly mounted on one end of the discharge pipe (3), and the mounting flange (5) is also fixedly mounted on one end of the inlet pipe (2).

5. The anti-backflow pneumatic stop valve according to claim 1, characterized in that: A valve seat (4) is fixedly mounted on the top of the stop valve body (1) to facilitate staff to adjust the size of the valve core opening.

6. The anti-backflow pneumatic stop valve according to claim 4, characterized in that: The valve seat (4) is fixedly connected to the stop valve body (1) via a threaded screw.

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