Pneumatic stop valve

Abstract

The utility model provides a pneumatic stop valve which comprises a stop valve body and further comprises a shell, a gas-liquid pressurizing air cylinder, an electromagnetic valve and a controller. The shell is fixed to the upper end of a valve deck in the stop valve body, the gas-liquid pressurizing air cylinder is arranged in the shell and fixed to the upper end of the valve deck, the driving end of the gas-liquid pressurizing air cylinder is fixed to the upper end of a valve rod in the stop valve body, the electromagnetic valve is fixed to the inner side of the shell, and the gas-liquid pressurizing air cylinder is connected with the electromagnetic valve through a pipeline. The controller is fixed to the front side of the shell, and the electromagnetic valve is electrically connected with the controller. According to the pneumatic stop valve, the size of the pneumatic stop valve can be effectively reduced, and when the stop valve needs large driving force at the closing position, unbalanced force generated when the stop valve is located at the closing position can be overcome by using the hydraulic boosting principle of the gas-liquid boosting air cylinder, and effective sealing of the stop valve is achieved.

Description

Technical Field

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

[0002] The stop valve is a widely used valve with many structural forms to meet the requirements of different working conditions. The stop valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The valve stem opening stroke of the stop valve is relatively short, and the opening height is generally only 1 / 4 of the valve seat channel diameter. The friction between the sealing surfaces of the stop valve is small, and it has a very reliable cut-off function. Usually, the stop valve has only one sealing surface, so the manufacturing process is better and it is easy to maintain, so the stop valve is very commonly used in industrial systems.

[0003] However, ordinary stop valves have a disadvantage: the unbalanced force of the stop valve is large, that is, the unbalanced force applied to the stop valve in the closed position is the total pressure difference of the valve multiplied by the effective cross-sectional area of ​​the valve disc. The required driving force or torque is also much larger accordingly, especially for pneumatic stop valves. Since the air source of the pneumatic stop valve has a pressure of only a few kilograms and the energy density is not high, the actuator is huge, which increases the weight of the entire valve. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a pneumatic stop valve, which can effectively reduce the size of the pneumatic stop valve, and when the stop valve requires a large driving force in the closed position, the hydraulic force amplification principle of the gas-liquid booster cylinder is used to overcome the unbalanced force when the stop valve is in the closed position, thereby achieving effective sealing of the stop valve.

[0005] The utility model provides a pneumatic stop valve, comprising a stop valve body, the pneumatic stop valve also comprising a shell, a gas-liquid boosting cylinder, a solenoid valve and a controller; the shell is fixed to the upper end of a valve cover in the stop valve body, the gas-liquid boosting cylinder is arranged inside the shell and fixed to the upper end of the valve cover, the driving end of the gas-liquid boosting cylinder is fixed to the upper end of a valve stem in the stop valve body, the solenoid valve is fixed to the inner side of the shell, the gas-liquid boosting cylinder is connected to the solenoid valve through a pipeline, the controller is fixed to the front side of the shell, and the solenoid valve is electrically connected to the controller.

[0006] The utility model adopts a gas-liquid booster cylinder as the actuator of the stop valve. Since the force required when the stop valve is in the closed position is very large, but the force during the switching process is relatively small, its characteristics are perfectly matched with the output curve of the booster cylinder. In this way, it is only necessary to determine the size of the gas-liquid booster cylinder according to the force during the switching process, and the size is significantly reduced. When the stop valve requires a large driving force in the closed position, the hydraulic force enhancement principle of the gas-liquid booster cylinder is used to overcome the unbalanced force when the stop valve is in the closed position, thereby achieving effective sealing of the stop valve.

[0007] In one possible embodiment, the driving end of the gas-liquid booster cylinder is connected and fixed to the upper end of the valve stem by a clamping block; by adopting this structure, the driving end of the gas-liquid booster cylinder can be reliably fixed to the upper end of the valve stem by the clamping block, and has the advantage of easy fixing.

[0008] In a possible embodiment, a locking nut threadedly connected to the driving end of the gas-liquid booster cylinder is sleeved on the driving end of the gas-liquid booster cylinder, and the locking nut is tightened with the upper end of the clamping block; by adopting this structure, under the action of the locking nut, the locking nut can be tightened with the upper end of the clamping block, thereby further enabling the driving end of the gas-liquid booster cylinder to be reliably fastened together with the clamping block.

[0009] In a possible embodiment, an observation window is provided on the shell, and the oil indicator on the gas-liquid booster cylinder is located in the observation window; by adopting this structure, the user can conveniently observe the oil in the oil indicator through the observation window, thereby being able to intuitively observe the amount of oil in the oil indicator.

[0010] In a possible implementation, the pressure gauge on the gas-liquid booster cylinder is exposed outside the shell; by adopting this structure, the user can visually observe the pressure value in the gas-liquid booster cylinder through the pressure gauge, which can bring convenience to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model after removing the shell. DETAILED DESCRIPTION

[0013] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0014] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0015] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0016] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] See also Figure 1-2 As shown, an embodiment of the present application discloses a pneumatic stop valve, including a stop valve body 1, the pneumatic stop valve also including a shell 2, a gas-liquid booster cylinder 3, a solenoid valve 4 and a controller 5; the shell 2 is fixed to the upper end of a valve cover 11 in the stop valve body 1, the gas-liquid booster cylinder 3 is arranged inside the shell 2 and fixed to the upper end of the valve cover 11, the driving end of the gas-liquid booster cylinder 3 is fixed to the upper end of a valve stem 12 in the stop valve body 1, the solenoid valve 4 is fixed to the inner side of the shell 2, the gas-liquid booster cylinder 3 is connected to the solenoid valve 4 through a pipeline, the controller 5 is fixed to the front side of the shell 2, and the solenoid valve 4 is electrically connected to the controller 5.

[0018] The driving end of the gas-liquid booster cylinder 3 is connected and fixed to the upper end of the valve stem 12 through the clamping block 6; by adopting this structure, the driving end of the gas-liquid booster cylinder can be reliably fixed to the upper end of the valve stem through the clamping block, and has the advantage of easy fixation.

[0019] A locking nut 7 threadedly connected to the driving end of the gas-liquid booster cylinder 3 is sleeved on the driving end of the gas-liquid booster cylinder 3, and the locking nut 7 is tightened with the upper end of the clamping block 6; after adopting this structure, under the action of the locking nut, the locking nut can be tightened with the upper end of the clamping block, thereby further enabling the driving end of the gas-liquid booster cylinder to be reliably fastened together with the clamping block.

[0020] An observation window 21 is provided on the shell 2, and the oil indicator 31 on the gas-liquid booster cylinder 3 is located in the observation window 21; by adopting this structure, the user can conveniently observe the oil in the oil indicator through the observation window, so as to intuitively observe the oil amount in the oil indicator.

[0021] The pressure gauge 32 on the gas-liquid booster cylinder 3 is exposed outside the shell 2; by adopting this structure, the user can visually observe the pressure value in the gas-liquid booster cylinder through the pressure gauge, which can bring convenience to the user.

[0022] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A pneumatic stop valve, comprising a stop valve body (1), characterized in that: The pneumatic stop valve further comprises a housing (2), a gas-liquid boosting cylinder (3), a solenoid valve (4) and a controller (5); the housing (2) is fixed to the upper end of a valve cover (11) in a stop valve body (1); the gas-liquid boosting cylinder (3) is arranged inside the housing (2) and fixed to the upper end of the valve cover (11); the driving end of the gas-liquid boosting cylinder (3) is fixed to the upper end of a valve stem (12) in the stop valve body (1); the solenoid valve (4) is fixed to the inner side of the housing (2); the gas-liquid boosting cylinder (3) is connected to the solenoid valve (4) via a pipeline; the controller (5) is fixed to the front side of the housing (2); and the solenoid valve (4) is electrically connected to the controller (5).

2. The pneumatic stop valve according to claim 1, characterized in that: The driving end of the gas-liquid boosting cylinder (3) and the upper end of the valve stem (12) are connected and fixed via a clamping block (6).

3. The pneumatic stop valve according to claim 2, characterized in that: A locking nut (7) threadedly connected to the driving end of the gas-liquid booster cylinder (3) is sleeved on the driving end of the gas-liquid booster cylinder (3), and the locking nut (7) is tightly fastened to the upper end of the clamping block (6).

4. The pneumatic stop valve according to any one of claims 1 to 3, characterized in that: The housing (2) is provided with an observation window (21), and the oil indicator (31) on the gas-liquid boost cylinder (3) is located in the observation window (21).

5. The pneumatic stop valve according to any one of claims 1 to 3, characterized in that: The pressure gauge (32) on the gas-liquid boosting cylinder (3) is exposed outside the housing (2).

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