A container fill limiting device configured with a switch valve

Abstract

The utility model discloses a kind of container limited charging devices of configuration switch valve, it is characterized in that, it includes float ball assembly, lever mechanism, valve body, valve rod, metal ball, the end of valve rod is provided with fork, is hinged with lever mechanism by pin shaft, lever mechanism and float ball assembly linkage connection;Valve body is T-shaped structure, valve body horizontal section is provided with liquid inlet passage, metal ball containing cavity, liquid outlet passage, vertical section is provided with valve rod guide channel, horizontal section and vertical section converge in metal ball containing cavity, the diameter of metal ball and valve rod guide channel and metal ball containing cavity match, and greater than the inner diameter of liquid inlet passage and liquid outlet passage, so that by valve rod lifting metal ball in valve rod guide channel under the action of Bernoulli's principle, high-speed fluid is inhaled into metal ball containing cavity, under the action of liquid flow thrust, block in the liquid inlet end of liquid outlet passage, reach the purpose of container automatic limited charging.The utility model is simple in structure, good stability, lifelong maintenance-free.

Description

Technical Field

[0001] This utility model relates to the field of container filling safety technology, and more specifically to a container filling limiting device equipped with a switching valve. Background Technology

[0002] The storage and transportation of cryogenic liquefied gases is a highly specialized field. Regarding the requirements for auxiliary devices installed inside storage tanks, according to GB / T34510-2017 requirements for vehicle-mounted gas cylinders, it is necessary to ensure that the inner liner of the cylinder has a safety margin of more than 10%. Therefore, an overfill prevention device must be installed in the inner liner of the cylinder. GB / T18442.3-2019 "Fixed Vacuum Insulated Cryogenic Pressure Vessels" requires that the inner container be equipped with an overflow port for overfill prevention. Small cryogenic containers with a geometric volume not exceeding 10 m³ should also be equipped with an overfill prevention device. To prevent accidents caused by overfilling of the tank, the design and manufacturing units should propose measures to control the maximum filling volume of the tank. The manufacturing unit should provide overfill prevention devices for containers with a geometric volume of 10 m³ or less. 3 Cryogenic pressure vessels are equipped with filling limiting devices.

[0003] One existing technology is: overflow port observation + manual valve closure. The main drawback of this technology is that during pump charging, the cryogenic medium flows out too quickly, and there is not enough time to close the valve, resulting in overcharging; that is to say, this technical solution is only suitable for non-pump charging conditions and cannot be used under all operating conditions.

[0004] The second existing technology is the pre-reserved gas phase space method. This technology involves pre-setting a small gas phase space tank inside the main tank, typically occupying 10% of the total volume. This tank has a welded, sealed structure and includes a flow-limiting orifice. During pump filling, only a very small amount of liquid can flow into the orifice, thus automatically cutting off the pump filling process. In practical applications, the internal tank often becomes flattened, causing the main tank to be in an abnormal operating state.

[0005] For example, the applicant of this patent application disclosed a container filling limiting device in Chinese Patent Publication No. CN212745968U, which is fixed inside the container and includes a filling limiting valve body and a float assembly. The filling limiting valve body includes a filling channel that communicates with the container. The float assembly is connected to the valve body through a lever assembly. A flap is also provided in the filling channel connected to the filling limiting valve body. One end of the flap is provided with a hinge shaft. The movable end face of the flap, which rotates along the hinge shaft, forms a movable closed connection with the filling channel. The other movable end face forms a pushing connection with a push rod on the lever assembly. When the float moves, the lever assembly is forced to push the push rod to touch the flap. Under the combined action of fluid thrust, the flap rotates, blocking the fluid channel and achieving the purpose of limiting filling.

[0006] The filling channel of this patented structure is connected by a flap for movable sealing. The flap sealing structure has a good pump filling effect, but it requires high operator skill when not pumping (it requires concentration and manual timely valve closure). Therefore, it is necessary to improve the structure. Summary of the Invention

[0007] The purpose of this utility model is to provide a stable, reliable, and simple container filling limiting device with a switching valve to overcome the shortcomings of existing technologies.

[0008] This invention utilizes Bernoulli's principle—the kinetic energy (related to flow velocity) and potential energy (related to pressure) of a fluid transform into each other during flow, while the total energy remains constant. When the fluid velocity increases, the kinetic energy increases, and the pressure energy decreases accordingly; conversely, when the flow velocity decreases, the kinetic energy decreases, and the pressure energy increases. Combined with the T-shaped structure of this patent, within a closed bottle / can, the product is horizontally placed in the gas phase space at the top of the container. A vertical valve stem guide channel is provided at the lower part of the horizontal flow channel. When the float activates the linkage mechanism's push rod, it lifts the steel ball upwards to contact the fluid, resulting in negative pressure adsorption generated by the high-speed fluid. The ball rapidly rises and, with the help of fluid thrust, seals the fluid channel, achieving automatic filling limitation.

[0009] A container filling limiting device with a switching valve is characterized in that it includes a float assembly, a lever mechanism, a valve body, a valve stem, and a metal ball. The end of the valve stem is provided with a clamping fork, which is hinged to the lever mechanism via a pin to achieve linkage with the float assembly. The valve body is provided with a metal ball receiving cavity, an inlet channel, an outlet channel, and a valve stem guide channel. The inlet channel, outlet channel, and valve stem guide channel converge in the metal ball receiving cavity. The diameter of the metal ball is larger than the inner diameter of the inlet channel and the outlet channel, so that the metal ball pushed into the metal ball receiving cavity by the valve stem can block the inlet end of the outlet channel under the action of liquid flow.

[0010] As a further explanation of the above scheme, the valve stem guide channel is vertically arranged, and its inner diameter is larger than the outer diameter of the metal ball, so that the metal ball can be inserted into the metal ball receiving cavity through this channel, which facilitates the assembly of the device.

[0011] Furthermore, the inlet channel, the metal ball receiving cavity, and the outlet channel are connected in sequence to form the horizontal section of the valve body, and the angle between the valve stem guide channel and the horizontal section of the valve body is 30°-90°.

[0012] Furthermore, the valve stem includes a valve stem body and an end plate. The end plate is fixed to the end of the valve stem body to stably support the metal ball and ensure the positional accuracy of the metal ball during movement.

[0013] Furthermore, a cap is provided at the end of the valve stem guide channel. The cap is connected and fixed to the valve stem guide channel by fasteners or welded, which can effectively prevent the metal ball from accidentally falling out of the valve stem guide channel. The cap is provided with a through hole to allow the valve stem to pass through, ensuring that the valve stem can move up and down smoothly.

[0014] Furthermore, the cover is provided with a boss, which is connected to the valve stem guide channel. The through hole is located in the middle of the boss, and multiple notches are distributed circumferentially on the upper edge of the through hole.

[0015] Furthermore, the valve stem is equipped with a clamping fork at its end for hinged lever mechanism. The float assembly is connected to the external float mechanism to achieve linkage between the float assembly and the valve stem, enabling the valve stem to perform corresponding lifting and lowering actions according to the liquid level.

[0016] Furthermore, the valve body has a T-shaped three-way pipe structure, which is conducive to the flow of liquid and the movement of the metal ball; countersunk holes are provided at the ends of the inlet and outlet channels, which are used for insertion welding of the inlet and outlet pipes.

[0017] The beneficial effects that this utility model can achieve by adopting the above-mentioned technical solution are:

[0018] 1. This utility model adopts a switch valve structure mainly composed of a valve body, a valve stem, and a metal ball. The valve stem is used to connect an external lever mechanism, which is connected to a float assembly. The float assembly drives the lever mechanism to swing as the liquid level rises and falls, thereby driving the valve stem to move up and down along the valve stem guide channel. This allows the metal ball to switch positions between the metal ball receiving cavity and the valve stem guide channel, realizing the cutting off or opening of the channel between the inlet and outlet channels (both the steel ball and the push rod return to their automatic positions based on gravity). This achieves automatic limited filling of the container. Because the entire valve structure is very simple and the metal ball has sufficient weight, once the pressure of the inlet and outlet channels is balanced, it can easily fall back to the valve stem guide channel under the action of gravity without affecting the connection between the inlet and outlet channels. The performance is stable and reliable.

[0019] 2. This utility model has a very simple structure, achieving its function through only three core components, thus reducing manufacturing costs; the metal ball can quickly reset by its own gravity, with minimal leakage, solving the problem of continuous low-flow filling of the flap structure in non-pump filling state, with an action response time ≤0.3 seconds; it is suitable for all working conditions such as pump filling and non-pump filling.

[0020] 3. This utility model applies Bernoulli's principle. By utilizing the combined action of fluid adsorption and thrust, the float only needs to send a limit signal to the linkage mechanism to push the valve stem upward, which can achieve the purpose of limiting filling through the metal ball. When the pressure is balanced, the metal ball can automatically reset under the action of gravity. The metal ball is subjected to uniform force throughout the process, the action is simple and there is zero loss, which can ensure that it is maintenance-free for life. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the valve body structure of this utility model.

[0022] Figure 2 This is a side view of the valve body of this utility model.

[0023] Figure 3 This is a schematic diagram of the channel of this utility model in the open state.

[0024] Figure 4 This is a schematic diagram of the sealing structure of this utility model.

[0025] Figure 5 This is a schematic diagram of the upward-moving structure of the metal ball according to this utility model.

[0026] Figure 6 This is a schematic diagram of the channel of this utility model in the closed state.

[0027] Figure 7 This is a schematic diagram of the connection structure between the valve body and the float assembly.

[0028] Explanation of reference numerals in the attached drawings: 1. Valve body 1-1. Metal ball receiving cavity 1-2. Liquid inlet channel 1-3. Liquid outlet channel 1-4. Valve stem guide channel 1-5. Countersunk hole 2. Valve stem 2-1. Valve stem body 2-2. End plate 3. Metal ball 4. Cover 4-1. Boss 4-2. Through hole 4-3. Notch 5. Lever mechanism 6. Float assembly. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in this description of the utility model, "at least" means one or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of this utility model clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0034] like Figures 1-6As shown, this utility model is a container filling limiting device equipped with a switching valve, including a valve body 1, a valve stem 2, and a metal ball 3. The valve body 1 has a metal ball receiving cavity 1-1, an inlet channel 1-2, an outlet channel 1-3, and a valve stem guide channel 1-4. The inlet channel 1-2, outlet channel 1-3, and valve stem guide channel 1-4 converge at the metal ball receiving cavity 1-1. The diameter of the metal ball 3 is larger than the inner diameter of the inlet channel 1-2 and the outlet channel 1-3, allowing the metal ball 3, pushed into the metal ball receiving cavity 1-1 by the valve stem 2, to seal the inlet end of the outlet channel under the action of liquid, achieving the purpose of automatic filling limiting of the container. The valve body 1 has a T-shaped three-way pipe structure. This structural design makes the layout of the inlet channel 1-2, outlet channel 1-3, and valve stem guide channel 1-4 more reasonable, which is beneficial to the flow of liquid and the movement of the metal ball. Countersunk holes 1-5 are provided at the ends of the inlet channel 1-2 and the outlet channel 1-3. The inner diameter of the valve stem guide channel 1-4 is larger than the outer diameter of the metal ball 3, allowing the metal ball to be inserted into the metal ball receiving cavity 1-1 through this channel, facilitating device assembly. In this embodiment, the diameter of the metal ball 3 is 2-5 mm larger than the inner diameter of the inlet channel 1-2 and the outlet channel 1-3; its diameter is 1-3 mm smaller than the valve stem guide channel 1-4, ensuring smooth passage through the guide channel for resetting. The valve stem 2 includes a valve stem body 2-1 and an end plate 2-2. The end plate 2-2 is fixed to the top of the valve stem body 2-1, forming a circular support surface with a diameter slightly smaller than the metal ball, used to stably support the metal ball and ensure the accuracy of the metal ball's position during movement. It is worth noting that the valve stem 2 can also be directly set as a straight rod structure, with the end plate design omitted, as long as it can push the metal ball 3 to move. Figure 7 The diagram shows the overall structure of the container filling device. Besides the switching valve, the structure includes a float assembly 6 and a lever mechanism 5. The end of the valve stem 2 is equipped with a clamping fork 2-3, which is hinged to the external lever mechanism 5 via a pin, achieving linkage with the float assembly 6. This allows the valve stem to move up and down according to the liquid level. The specific structure of the float assembly and lever mechanism can be found in the background section. The inlet channel, the metal ball receiving cavity, and the outlet channel are sequentially connected to form the horizontal section of the valve body. The angle between the valve stem guide channel and the horizontal section of the valve body is 30°-90°.

[0035] A cover 4 is provided at the end of the valve stem guide channel 1-4. The cover 4 is connected and fixed to the end of the valve stem guide channel 1-4 by fasteners, which can effectively prevent the metal ball from accidentally falling out of the valve stem guide channel. The cover 4 is provided with a through hole 4-2 to allow the valve stem to pass through, ensuring that the valve stem can move up and down smoothly. The cover 4 is provided with a boss 4-1, which is inserted and fitted into the valve stem guide channel 1-4. The through hole is located in the middle of the boss, and multiple notches 4-3 are distributed circumferentially on the upper edge of the through hole. These notches can play the role of venting and balancing pressure during the movement of the valve stem, ensuring smooth movement of the valve stem. In this embodiment, the diameter of the through hole is 0.5-1mm larger than that of the valve stem body, and four notches with a depth of 2mm are evenly distributed on the upper edge to balance the internal and external air pressure of the cavity during the movement of the valve stem.

[0036] The working principle of this device is as follows: When the liquid level in the container is lower than the set value, the float assembly drives the valve stem to rise through the lever mechanism. When the filling threshold is reached, the end plate completely pushes the metal ball into the receiving cavity. The metal ball is sealed at the front end of the liquid outlet channel by hydraulic pressure. At this time, the liquid inlet channel and the liquid outlet channel are cut off, and filling stops. As the liquid level gradually drops, the metal ball loses its support and, under the combined action of its own gravity and the medium pressure, accurately falls into the valve stem guide channel, restoring the connection between the liquid inlet channel and the liquid outlet channel. Key technical parameters of this embodiment: ① Applicable medium temperature range: -196℃~60℃; ② Working pressure: 0.1-4.5MPa; ③ Action response time: ≤0.3 seconds.

[0037] Compared with existing technologies, this technical solution adopts a switch valve structure mainly composed of a valve body, valve stem, and metal ball. The valve stem is used to connect an external lever mechanism, which is connected to a float assembly. The float assembly, by rising and falling with the liquid level, drives the lever mechanism to swing, thereby driving the valve stem to move up and down along the valve stem guide channel. This allows the metal ball to switch positions between the metal ball receiving cavity and the valve stem guide channel, realizing the cutting off or opening of the channel between the inlet and outlet liquid channels, thus achieving automatic limited filling of the container. Because the entire valve structure is very simple, with few parts, assembly is convenient, reducing manufacturing and maintenance costs. Moreover, the metal ball has sufficient weight; after filling is complete, the pressure at both ends of the valve body is balanced, allowing it to easily fall back into the valve stem guide channel under gravity, without affecting the connection between the inlet and outlet liquid channels. The reset is rapid and complete, and the performance is stable and reliable. Furthermore, this device is suitable for various working conditions, such as pump filling, solving the problem of existing technologies not being able to be used under all working conditions. It also eliminates the risk of the internal small tank being crushed, greatly improving the safety of the container filling process. In addition, the valve body adopts a T-shaped three-way pipe structure, and the countersunk holes at the ends of the liquid inlet and liquid outlet channels facilitate welding of the inlet and outlet pipes, further ensuring the normal operation and safe use of the device.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A container filling limiting device equipped with a switching valve, characterized in that, It includes a float assembly, a lever mechanism, a valve body, a valve stem, and a metal ball. The end of the valve stem is equipped with a clamping fork, which is hinged to the lever mechanism via a pin. The lever mechanism is linked to the float assembly. The valve body is provided with a metal ball receiving cavity, an inlet channel, an outlet channel, and a valve stem guide channel. The inlet channel, outlet channel, and valve stem guide channel converge in the metal ball receiving cavity. The diameter of the metal ball is larger than the inner diameter of the inlet channel and the outlet channel.

2. A container filling limiting device with a switching valve according to claim 1, characterized in that, The inlet channel, the metal ball receiving cavity, and the outlet channel are connected in sequence to form the horizontal section of the valve body. The angle between the valve stem guide channel and the horizontal section of the valve body is 30°-90°.

3. A container filling limiting device with a switching valve according to claim 1, characterized in that, The inner diameter of both the valve stem guide channel and the metal ball receiving cavity is larger than the outer diameter of the metal ball.

4. A container filling limiting device with a switching valve according to claim 1, characterized in that, The valve stem includes a valve stem body and an end plate, which are integrally formed to stably support the metal ball.

5. A container filling limiting device with a switching valve according to claim 1, characterized in that, The end of the valve stem guide channel is provided with a cover, which is connected and fixed to the valve body by fasteners or welding; the cover is provided with a through hole to allow the valve stem to pass through.

6. A container filling limiting device with a switching valve according to claim 5, characterized in that, The cover is provided with a boss, which is connected to the valve stem guide channel; the through hole is located in the middle of the boss, and multiple notches are distributed circumferentially on the upper edge of the through hole.

7. A container filling limiting device with a switching valve according to claim 1, characterized in that, The valve stem is equipped with a clamping fork at its end for hinged lever mechanism. The float assembly is connected to the external float mechanism through the lever mechanism to achieve linkage between the float assembly and the valve stem.

8. A container filling limiting device with a switching valve according to claim 1, characterized in that, The valve body is a T-shaped three-way pipe structure; countersunk holes are provided at the ends of the inlet and outlet channels.

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