Filling limiting device of pressure container and pressure container

Abstract

The invention provides a pressure vessel and a filling limiting device thereof, the filling limiting device comprises a support piece, a valve piece, a floating piece and a connecting rope, the support piece is connected with a tank body of the pressure vessel, the valve piece is connected with the support piece, the valve piece comprises a valve body and a valve core used for controlling on-off of a fluid channel on the valve body, and the floating piece is connected with the valve body. The floating part is arranged in the tank body of the pressure container and floats and descends along with ascending and descending of the liquid level in the tank body, the floating part is connected with the valve element through the connecting rope, and the floating part and the valve element are both located below the supporting part of the supporting part, so that when the floating part floats upwards, the valve element descends downwards, and the buoyancy requirement of the floating part is reduced; the problem of excessive filling caused by the fact that a fluid channel of a valve body cannot be closed due to insufficient buoyancy of a valve element of the filling limiting device is solved, and safety is improved. And the use of the filling limiting device is not influenced by the volume of the tank body, so that the use range is wider, and the accuracy is higher.

Description

Technical Field

[0001] The present invention relates to the field of pressure vessels, and in particular to a filling limiting device for a pressure vessel and the pressure vessel. Background Art

[0002] To prevent overfilling in existing containers for storing cryogenic liquids, particularly those containing cryogenic media, a limited-fill air chamber is typically installed inside the container, with a small hole connecting the air chamber to the container. When the container is full, liquid flows through the hole into the air chamber, creating a certain amount of gas phase space within the container, preventing the liquid from expanding and damaging the container as it heats up. This type of limited-fill function has the following drawbacks: 1. To meet filling rate requirements, the larger the container volume, the larger the limited filling cavity, and the more material used. During the liquid filling process, the limited filling cavity is subjected to external pressure, which may cause instability and flattening, resulting in a reduction in the volume of the limited filling cavity, which in turn leads to the problem of overfilling.

[0003] 2. If the medium contains impurities, the small holes set in the limited inflation cavity may be blocked, resulting in the liquid in the container being unable to enter the limited inflation cavity, thereby causing excessive liquid in the container and posing a safety hazard.

[0004] 3. The above-mentioned limited inflation cavity is set inside the container. When there is liquid inside the limited inflation cavity, the amount of medium entering the limited inflation cavity from the small hole is reduced and uncertain, which leads to excessive liquid in the container and poses a safety hazard. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in existing cryogenic medium containers that overfilling is easily caused by preventing overfilling.

[0006] In order to solve the above technical problems, the present invention provides a filling limiting device for a pressure vessel, comprising a support member, a valve member, a floating member and a connecting rope; the support member is used to connect to the tank body of the pressure vessel, and the support member is provided with a supporting portion; the valve member is connected to the support member and is located below the supporting portion of the support member; the valve member comprises a valve body and a valve core, the valve body is provided with a fluid channel, the fluid channel comprises a liquid inlet for connecting to a liquid inlet pipe and a liquid outlet for connecting to the interior of the tank body, and the valve core is liftably arranged in the valve body; the floating member is arranged inside the tank body of the pressure vessel and floats up and down with the rise and fall of the liquid level in the pressure vessel; the floating member is located below the supporting portion of the support member; the connecting rope is guide-connected to the supporting portion of the support member, and the two ends of the connecting rope are respectively connected to the valve core and the floating member, when the floating member floats upward, the valve core descends to cut off the fluid channel; when the floating member descends, the valve core is driven by the connecting rope to rise to connect the fluid channel.

[0007] In some schemes of the present application, a accommodating chamber is further provided on the valve body, and the accommodating chamber is located above the fluid channel and is connected to the fluid channel; the valve core is capable of moving between the accommodating chamber and the fluid channel, and when the valve core is located inside the fluid channel, the fluid channel is cut off, and when the valve core moves up to the accommodating chamber, the fluid channel is connected.

[0008] In some embodiments of the present application, the valve core is spherical, and the diameter of the valve core is larger than the caliber of the fluid channel.

[0009] In some embodiments of the present application, the fluid channel includes a first fluid channel section and a second fluid channel section, the first fluid channel section connects the liquid inlet and the accommodating chamber, and the second fluid channel section connects the accommodating chamber and the liquid outlet; when the valve core cuts off the fluid channel, the valve core blocks the second fluid channel section.

[0010] In some schemes of the present application, the top surface of the valve body is provided with a connecting port connected to the accommodating cavity, and the connecting rope passes through the connecting port to be connected to the valve core; when the valve core cuts off the fluid channel, the liquid inlet pipe is connected to the peripheral space of the floating part through the connecting port; the flow area of ​​the connecting port is smaller than the flow area of ​​the fluid channel.

[0011] In some solutions of the present application, a channel is provided on the support member, one end of the channel is connected to the connecting port, and the other end is connected to the peripheral space of the floating member; the connecting rope is passed through the channel.

[0012] In some embodiments of the present application, the channel includes a first channel, a second channel and a third channel, the first channel and the second channel are spaced apart and both are arranged vertically, and the third channel connects the upper end of the first channel and the upper end of the second channel; one end of the connecting rope passes through the first channel to connect to the valve core; the other end of the connecting rope passes through the second channel to connect to the floating member.

[0013] In some solutions of the present application, the support member includes a curved pipe, and the channel is provided on the curved pipe; one end of the curved pipe is connected to the valve body, and the other end extends downward and is slidably connected to the floating member.

[0014] In some solutions of the present application, the floating member includes a float and a guide tube, the guide tube vertically penetrates the float and is fixedly connected to the float; the guide tube is slidably connected to an end of the bend away from the valve body.

[0015] In some solutions of the present application, the support member includes a guide rail, which is vertically arranged. The floating member is slidably connected to the guide rail, so that the floating member can slide up and down along the guide rail.

[0016] In some solutions of the present application, the interior of the floating member has a hollow cavity, and the floating member is provided with a pressure balancing through hole, and the pressure balancing through hole is connected to the cavity.

[0017] In some solutions of the present application, the pressure balancing through hole is arranged at the top or bottom of the floating member.

[0018] In some embodiments of the present application, the weight ratio of the floating member to the valve core ranges from 2:1 to 20:1; the diameter of the valve core ranges from 8mm to 50mm; the wall thickness of the floating member ranges from 0.2mm to 2mm, and the diameter ranges from 60mm to 400mm.

[0019] A pressure vessel comprises a tank body, a liquid inlet pipe and a filling limiter. The tank body is used to store a cryogenic liquid medium. A floating member of the filling limiter is arranged in the tank body. The fluid channel of the filling limiter is connected to the liquid inlet pipe and the interior of the tank body.

[0020] In some embodiments of the present application, the density of the cryogenic liquid medium ranges from 0.03 kg / L to 2 kg / L; the pressure of the cryogenic liquid medium in the tank body ranges from 0.1 MPa to 4.0 MPa.

[0021] It can be seen from the above technical solution that the beneficial effects of the present invention are: The pressure vessel filling limiter device of the present application includes a support member, a valve member, a floating member, and a connecting rope. The support member is connected to the tank body of the pressure vessel, and the valve member is connected to the support member. The valve member includes a valve body and a valve core for controlling the flow of a fluid passage in the valve body. The floating member is disposed within the tank body of the pressure vessel and rises and falls with the rise and fall of the liquid level within the tank body. The floating member is connected to the valve core via a connecting rope. When the liquid level within the tank body reaches a set position, the buoyancy of the floating member acts on the valve core via the connecting rope, causing the valve core to descend, cutting off the connection between the liquid inlet pipe and the interior of the tank body, thereby stopping the filling of the tank body with liquid and preventing the problem of overfilling the tank body. Moreover, the use of the filling limiter device is not affected by the volume of the tank body, and has a wider range of applications and higher accuracy. Among them, the floating part and the valve part are both located below the supporting part of the supporting part, and the middle part of the connecting rope is connected to the supporting part for guidance, so that when the floating part floats upward, the valve core descends, and the buoyancy of the floating part does not need to overcome the weight of the valve core, that is, the buoyancy of the floating part overcomes the gravity difference between the floating part and the valve core to achieve the descent of the valve core, thereby reducing the buoyancy requirement of the floating part, avoiding the problem of overfilling caused by the valve core of the filling limit device being unable to close the fluid channel of the valve body due to insufficient buoyancy, thereby improving safety; it also enables the filling limit device to be applied to the filling condition of low-density liquids and to ensure the accuracy of filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the structure of the pressure vessel in some embodiments, where the arrows indicate the filling flow direction.

[0023] Figure 2 It is a schematic diagram of the main structure of the filling limit device in one embodiment.

[0024] Figure 3 yes Figure 2 The right side structural diagram of the filling limit device is shown, in which the liquid inlet pipe and the tank body are in a connected state.

[0025] Figure 4 yes Figure 2 The right side structural diagram of the filling limiting device is shown, in which the liquid inlet pipe and the tank body are in a disconnected state.

[0026] Figure 5 It is a schematic diagram of the main structure of the filling limit device in another embodiment.

[0027] The following are the descriptions of the reference numerals: 100-filling limit device; 200-tank body; 300-liquid inlet pipe; 1-support member; 11-elbow; 111-first pipe section; 112-second pipe section; 113-third pipe section; 1131-support part; 114-channel; 12-guide rail; 121-long strip through hole; 122-limiting ring; 2-valve member; 21-valve body; 211-fluid channel; 2111-first fluid channel section; 2112-second fluid channel section; 212-accommodating chamber; 213-connecting port; 22-valve core; 3-floating member; 31-float; 32-guide tube; 33-pin shaft; 311-hollow cavity; 4-connecting rope. DETAILED DESCRIPTION

[0028] Typical embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[0029] In the description of this application, it should be understood that in the embodiments illustrated in the accompanying drawings, indications of directions or positional relationships (such as up, down, left, right, front, and back) are provided solely for the purpose of facilitating the description of this application and simplifying the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. These descriptions are appropriate when these components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components change, these directional indications will also change accordingly.

[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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0031] See Figure 1The pressure vessel of the present application includes a tank body 200, a liquid inlet pipe 300, and a filling limiter 100. The tank body 200 is used to store a cryogenic liquid medium. For example, the tank body 200 is a liquefied natural gas (LNG) vehicle cylinder. The cryogenic liquid medium can be liquefied natural gas, liquid oxygen, liquid nitrogen, liquid argon, or liquid hydrogen, and is in a liquid state at low temperatures. Low temperatures refer to temperatures in the range of -80°C to -253°C. The filling limiter 100 is disposed inside the tank body 200. One end of the liquid inlet pipe 300 is connected to the filling limiter 100, and the other end is used to connect to a filling device (such as a filling machine) that provides the cryogenic liquid medium. When the filling device fills the tank body 200 with the cryogenic liquid medium through the liquid inlet pipe 300, the filling limiter 100 controls the connection between the liquid inlet pipe 300 and the tank body 200 according to the liquid level inside the tank body 200, thereby preventing the tank body 200 from being overfilled with the cryogenic liquid medium.

[0032] In some embodiments, the filling equipment is equipped with a detector to monitor the flow rate of the cryogenic liquid medium entering the liquid inlet pipe 300. When the filling limiter 100 cuts off the connection between the liquid inlet pipe 300 and the tank body 200, the flow rate of the cryogenic liquid medium in the liquid inlet pipe 300 decreases rapidly, triggering the shutdown of the external filling equipment, thereby achieving limited filling of the tank body. The remaining liquid in the liquid inlet pipe 300 enters the tank body 200 through the connection port 213 on the filling limiter 100.

[0033] Hereinafter, the term "liquid" will be used to refer to the aforementioned cryogenic liquid medium.

[0034] See Figures 2 to 4The filling limiting device 100 of the present application includes a support member 1, a valve member 2, a floating member 3 and a connecting rope 4. The support member 1 is connected to the tank body 200, and the support member 1 is used to install the valve member 2 and support the connecting rope 4. The valve member 2 includes a valve body 21 and a valve core 22. The valve body 21 is fixedly connected to the support member 1. A fluid channel 211 is provided on the valve body 21. The fluid channel 211 includes a liquid inlet and a liquid outlet. The liquid inlet is connected to the liquid inlet pipe 300, and the liquid outlet is connected to the interior of the tank body 200. The valve core 22 is arranged in a liftable manner in the valve body 21. The valve core 22 can move downward to a position to cut off the fluid channel 211, thereby cutting off the communication between the liquid inlet pipe 300 and the interior of the tank body 200, that is, the valve member 2 is in a closed state, so that the liquid cannot enter the interior of the tank body 200 through the liquid inlet pipe 300 and the fluid channel 211, thereby stopping filling. The valve core 22 can also move upward to a position connecting to the fluid passage 211, thereby establishing communication between the liquid inlet pipe 300 and the interior of the tank body 200. This means that the valve member 2 is in an open state, allowing liquid to enter the tank body 200 through the liquid inlet pipe 300 and the fluid passage 211. The floating member 3 is disposed within the tank body 200 of the pressure vessel and rises and falls with the liquid level within the tank body 200. The connecting rope 4 is a flexible, low-temperature-resistant structure, such as a steel cable. The connecting rope 4 is connected to the support member 1, and its ends are connected to the valve core 22 and the floating member 3, respectively.

[0035] The middle portion of the connecting rope 4 is connected to the support member 1 in a guide manner, specifically a slidable connection. The valve member 2 and the floating member 3 are both positioned lower than the middle portion of the connecting rope 4. This allows the valve core 22 to descend to cut off the fluid passage 211 when the floating member 3 rises. Furthermore, the direction of the force exerted on the floating member 3 by the weight of the valve core 22 via the connecting rope 4 is the same as the buoyancy of the liquid surface within the tank 200. Consequently, when the floating member 3 moves upward with the liquid surface, it does not need to overcome the weight of the valve core 22, but only a portion of the weight of the floating member 3 itself. Specifically, the buoyancy required for the valve core 22 to descend is the difference between the weight of the floating member 3 and the weight of the valve core 22. This reduces the buoyancy required for the valve core 22 to move, thus avoiding the problem of overfilling due to insufficient buoyancy. This configuration also enables the filling limiter 100 to be applied to low-density liquid filling operations and ensures accurate filling. For example, the filling limit device 100 is applied to a pressure vessel storing liquid with a density ranging from 0.03 kg / L to 2 kg / L.

[0036] exist Figure 1In the illustrated embodiment, the support member 1, valve member 2, floating member 3, and connecting rope 4 are all disposed inside the tank body 200. In other embodiments, the guide rail 12 of the support member 1 is disposed inside the tank body 200, the elbow 11 portion of the support member 1 is located outside the tank body 200, the valve member 2 is disposed outside the tank body 200 and connected to the portion of the elbow 11 located outside the tank body 200, the floating member 3 is disposed inside the tank body 200, and one end of the connecting rope 4 extends outside the tank body 200 and connects to the valve core 22 of the valve member 2, while the other end is located inside the tank body 200 and connected to the floating member 3.

[0037] See Figure 2 and Figure 5 The support member 1 includes a curved tube 11 connected to the tank body 200. The curved tube 11 has a channel 114 connecting both ends thereof. The connecting rope 4 is passed through the channel 114, so that the curved tube 11 supports the connecting rope 4. Specifically, the curved tube 11 forms a supporting portion 1131 of the support member 1 for supporting the connecting rope 4. The curved tube 11 also guides the connecting rope 4.

[0038] The elbow 11 comprises a first section 111, a second section 112, and a third section 113. The first and second sections 111, 112 are spaced apart and arranged vertically. The ends of the third section 113 are connected to the upper ends of the first and second sections 111, 112, respectively, forming an inverted "U" shape. The lower end of the first section 111 is connected to the valve body 21, while the lower end of the second section 112 faces the floating member 3. The passage 114 comprises a first passage, a second passage, and a third passage. The first passage is located on the first section 111, the second passage is located on the second section 112, and the third passage is located on the third section 113. The first, third, and second passages are sequentially connected, allowing the connecting rope 4 to pass through the passage 114 on the elbow 11. After connecting rope 4 is inserted into channel 114, the middle portion of connecting rope 4 contacts the bottom wall of the third channel, causing elbow 11 to support connecting rope 4 at the third channel. Specifically, support member 1 forms support portion 1131 at third section 113 of elbow 11. The end of connecting rope 4 that exits the first channel is connected to valve core 22, while the end of connecting rope 4 that exits the second channel is connected to floating member 3.

[0039] The lower end of the first channel faces the valve core 22 , and the lower end of the second channel faces the floating member 3 , thereby reducing the bending degree of the connecting rope 4 and making the connecting rope 4 slide more smoothly in the channel 114 .

[0040] The third pipe section 113 is an upwardly convex arc structure, with smooth transitions between the first and third pipe sections 111, and between the second and third pipe sections 112, 113. The shape of the third channel is consistent with that of the third pipe section 113, ensuring that the connecting rope 4 only contacts a portion of the bottom wall of the third channel, minimizing the contact area. This reduces friction between the connecting rope 4 and the curved pipe 11, further reducing the buoyancy required for the downward movement of the valve core 22. It should be noted that the third channel can also be a horizontally arranged straight channel.

[0041] See Figure 5 In one embodiment, the lower end of the second pipe section 112 extends vertically downward and is slidably connected to the floating member 3, so that the second pipe section 112 guides the floating member 3, that is, the second pipe section 112 serves as a guide rail for guiding the floating member 3. It should be noted that the lower end of the second pipe section 112 can also extend downward at an angle.

[0042] See Figure 2 In one embodiment, the support member 1 also includes a guide rail 12. The guide rail 12 is arranged vertically, and the upper end of the guide rail 12 is connected to the tank body 200, specifically connected to the top of the tank body 200. The lower end of the guide rail 12 is slidably connected to the floating member 3 to guide the movement of the floating member 3, so that the floating member 3 can only move up and down along the guide rail 12. A limiting ring 122 is provided at the bottom of the guide rail 12 to prevent the floating member 3 from falling off the guide rail 12. The bend pipe 11 is connected to the upper end of the guide rail 12, thereby realizing a fixed connection between the bend pipe 11 and the tank body 200, and does not affect the movement of the floating member 3. In this embodiment, the second pipe section 112 of the bend pipe 11 may not be slidably connected to the floating member 3. It should be noted that the movement direction of the floating member 3 along the guide rail 12 is not limited to vertical up and down movement, and can also be oblique up and down movement.

[0043] See Figures 2 to 4 The valve body 21 is provided with a fluid channel 211 and a receiving chamber 212. The fluid channel 211 has a liquid inlet and a liquid outlet at either end. The liquid inlet communicates with the liquid inlet pipe 300, while the liquid outlet communicates with the interior of the tank body 200. This allows liquid in the liquid inlet pipe 300 to enter the interior of the tank body 200 through the fluid channel 211 of the valve body 21. The receiving chamber 212 is located above and communicates with the fluid channel 211. The valve core 22 is arbitrarily disposed within the valve body 21 and is movable between the fluid channel 211 and the receiving chamber 212. When the valve core 22 descends into the fluid channel 211, it shuts off the fluid channel 211, disconnecting the liquid inlet pipe 300 from the interior of the tank body 200. When the valve core 22 ascends into the receiving chamber 212, it opens the fluid channel 211, connecting the liquid inlet pipe 300 to the interior of the tank body 200.

[0044] The inner diameter of the accommodating chamber 212 is larger than the outer diameter of the valve core 22, allowing the valve core 22 to move within the accommodating chamber 212. The diameter of the valve core 22 is larger than the diameter of the liquid outlet of the fluid channel 211, allowing the valve core 22 to block the liquid outlet of the fluid channel 211. It should be noted that the valve core 22 can also block other positions of the second fluid channel section 2112.

[0045] exist Figure 3 In the illustrated embodiment, the fluid channel 211 extends horizontally, the accommodating chamber 212 extends vertically, and the bottom of the accommodating chamber 212 is connected to the fluid channel 211. In other embodiments, the fluid channel 211 may be arranged in an inverted "L" shape or other shapes; and the accommodating chamber 212 may be arranged at an angle.

[0046] The fluid channel 211 includes a first fluid channel section 2111 and a second fluid channel section 2112, which are disposed on opposite sides of the accommodating chamber 212. The first fluid channel section 2111 connects the liquid inlet to the accommodating chamber 212, while the second fluid channel section 2112 connects the accommodating chamber 212 to the liquid outlet. When the valve core 22 descends, it falls between the first and second fluid channel sections 2111 and 2112, blocking the liquid outlet of the second fluid channel section 2112. This causes the valve core 22 to cut off the fluid channel 211, disconnecting the fluid channel 211 from the interior of the tank body 200. Among them, the first fluid channel section 2111 is directly opposite to the second fluid channel section 2112, so that the liquid entering the valve body 21 from the first fluid channel section 2111 impacts the surface of the valve core 22 away from the second fluid channel section 2112, so that the impact force applied by the liquid to the valve core 22 forms a force that presses the valve core 22 against the liquid outlet of the second fluid channel section 2112, thereby improving the effect of blocking the second fluid channel section 2112 and preventing the liquid from continuing to enter the interior of the tank body 200 and causing overfilling.

[0047] When the liquid level in the tank body 200 drops, the float 3 drops with the liquid level, causing the float 3 to pull the valve core 22 up. Since the valve core 22 is not filled with liquid at this time, there is no impact force of the liquid on the surface of the valve core 22, thereby reducing the resistance of the valve core 22 when it rises, allowing the valve core 22 to rise smoothly to the position of connecting to the fluid channel 211, thereby connecting the fluid channel 211 with the interior of the tank body 200.

[0048] Because the resistance to the valve core 22's ascent is low, the gravity difference between the floating member 3 and the valve core 22 can be designed to be small. Furthermore, the smaller the gravity difference between the floating member 3 and the valve core 22, the smaller the buoyancy required when the valve core 22 descends. This reduces the buoyancy required to descend the valve core 22, making the filling limiter 100 suitable for filling low-density liquid media.

[0049] In an alternative embodiment, the fluid channel 211 may extend vertically, with the accommodating chamber 212 located at the top of the fluid channel 211, and a communication port connected to the interior of the tank body 200 may be provided on the side of the bottom of the fluid channel 211. Alternatively, the fluid channel 211 may be arranged at other angles relative to the accommodating chamber 212. As long as the valve core 22 can block the communication port connected to the interior of the tank body 200, the communication between the liquid inlet pipe 300 and the tank body 200 can be cut off.

[0050] The top surface of the valve body 21 is provided with a connection port 213 that communicates with the accommodating chamber 212. The connecting rope 4 passes through the connection port 213 and connects to the valve core 22, thereby establishing a connection between the connecting rope 4 and the valve core 22. The flow area of ​​the connection port 213 is smaller than the flow area of ​​the fluid channel 211. Moreover, when the valve core 22 cuts off the communication between the fluid channel 211 and the interior of the tank body 200, the liquid inlet pipe 300 is connected to the connection port 213. When the valve core 22 cuts off the communication between the fluid channel 211 and the interior of the tank body 200, the flow rate of the liquid in the liquid inlet pipe 300 is suddenly reduced, thereby triggering the filling device to stop filling the liquid. In addition, after the filling device stops filling the liquid, the liquid remaining in the liquid inlet pipe 300 enters the interior of the tank body 200 through the connection port 213, thereby avoiding liquid waste. It should be noted that a pressure relief hole may be provided in the liquid inlet pipe 300 or the valve body 21 , and the pressure relief hole communicates with the interior of the tank body 200 , so that the remaining liquid in the liquid inlet pipe 300 enters the tank body 200 through the pressure relief hole.

[0051] exist Figure 4 In the embodiment shown, the connection port 213 communicates with the channel 114 of the support member 1, and the channel 114 of the support member 1 communicates with the peripheral space of the floating member 3. The peripheral space of the floating member 3 refers to the interior of the tank body 200 and outside the floating member 3.

[0052] The valve core 22 has a certain weight, and the gravity of the valve core 22 is greater than the fluid resistance exerted on the valve core 22 when the liquid enters the tank body 200 from the liquid inlet pipe 300. This ensures that the valve core 22 can smoothly descend to the position that blocks the fluid passage 211, thereby isolating the liquid inlet pipe 300 from the interior of the tank body 200. In one embodiment, the weight of the valve core 22 ranges from 0.02 kg to 5 kg. This allows the valve core 22 to overcome the fluid resistance exerted by the liquid on the valve core 22 and descend to the position that blocks the fluid passage 211, thereby isolating the liquid inlet pipe 300 from the interior of the tank body 200. Furthermore, the weight of the float 3, which pulls the valve core 22 upward by its own gravity, can be set to a smaller value, thereby reducing the buoyancy required by the liquid to push the float 3 upward, making the filling limiter 100 suitable for filling low-density liquid media.

[0053] In addition, the weight range of the valve core 22 is set to 0.02 kg to 5 kg, which can also reduce the volume of the valve core 22, thereby reducing the volume of the valve component 2, thereby reducing the space occupied by the valve component 2 inside the tank body 200 and improving the utilization rate of the tank body 200. It should be noted that the weight of the valve core 22 can also be other values.

[0054] In one embodiment, the valve core 22 is spherical, with a diameter greater than the caliber of the fluid channel 211 located below the accommodating cavity 212. That is, the diameter of the valve core 22 is greater than the caliber of the liquid outlet of the second fluid channel section 2112, enabling the valve core 22 to block the liquid outlet of the second fluid channel section 2112. The surface of the valve core 22 is curved, facilitating a close fit between the outer surface of the valve core 22 and the second fluid channel section 2112, thereby enhancing the effectiveness of the valve core 22 in blocking the liquid outlet of the second fluid channel section 2112. Furthermore, the valve core 22 has a simple structure, is easy to produce, and reduces production costs. It should be noted that the valve core 22 may also have other shapes.

[0055] In one embodiment, the valve core 22 is a steel ball structure, and the diameter of the valve core 22 is preferably 8 mm to 50 mm.

[0056] See Figure 2 and Figure 5 The interior of the floating member 3 has a hollow cavity 311, which makes the floating member 3 larger in volume when having the same weight, thereby increasing the contact area between the liquid and the floating member 3, thereby increasing the buoyancy exerted by the liquid on the floating member 3.

[0057] In some embodiments, the float 3 is provided with a pressure-balancing hole that communicates with the cavity. The tank 200 is a closed cavity. When the tank 200 is filled, the pressure inside the tank 200 increases. The pressure-balancing hole ensures that the cavity of the float 3 and the exterior are always in a state of pressure equilibrium, preventing the float 3 from collapsing and causing failure. For example, the pressure of the liquid in the tank 200 ranges from 0.1 MPa to 4.0 MPa.

[0058] In one embodiment, a pressure-balancing through hole is provided at the top of the float 3. Since the top of the float 3 is not in contact with the liquid, liquid is prevented from entering the float 3 and affecting its buoyancy. This allows the valve core 22 of the filling limiter 100 to accurately cut off the fluid passage 211 from communicating with the interior of the tank 200, thereby preventing overfilling.

[0059] In one embodiment, a pressure-balancing hole is provided at the bottom of the float 3. When the liquid level within the tank 200 rises and contacts the bottom surface of the float 3, the liquid surface blocks the pressure-balancing hole of the float 3, preventing the gas within the float 3 from escaping. Furthermore, as the pressure within the tank 200 increases, some liquid enters the float 3, balancing the internal and external pressures of the float 3 and preventing the float 3 from collapsing and failing. When the liquid level drops, the liquid within the float 3 is completely discharged, ensuring a stable and consistent buoyancy of the float 3 during each filling process. This allows the valve core 22 of the filling limiter 100 to accurately cut off the fluid passage 211 from the interior of the tank 200, preventing overfilling.

[0060] It should be noted that the pressure balancing through hole can also be provided in the middle or other positions of the floating member 3 .

[0061] The floating member 3 includes a float 31 and a guide tube 32. The interior of the float 31 forms a hollow cavity 311. Figure 5 In the illustrated embodiment, the float 31 is a spherical structure. The wall thickness of the float 31 is preferably 0.2 mm to 2 mm, and the diameter is 60 mm to 400 mm. It should be noted that the float 31 can also be a cylindrical structure or a structure of other sizes.

[0062] In one embodiment, a guide tube 32 vertically penetrates the float 31 and is fixedly connected to the float 31, thereby increasing the load-bearing strength of the float 31. The second section 112 of the elbow 11 is slidably connected to the guide tube 32. Specifically, the second section 112 of the elbow 11 penetrates the guide tube 32 and is slidably engaged with the guide tube 32, allowing the float 3 to move up and down only along the second section 112 of the elbow 11. The guide tube 32 passes through the center of the float 31, positioning the center of gravity of the float 3 within the guide tube 32, thus enhancing stability during its upward and downward movement. A pressure-balancing through-hole can be provided on the float 31 or on the guide tube 32.

[0063] The lower end of the second section 112 of the elbow 11 passes through the guide tube 32 and extends below the float 31, thereby preventing liquid flowing out of the channel 114 of the elbow 11 from impacting the upper surface of the float 31 and affecting the stability of the buoyancy. The lower end of the second section 112 is provided with an elongated through-hole 121, with the length of the elongated through-hole 121 extending vertically. A pin 33 is provided on the guide tube 32. The pin 33 passes through the elongated through-hole 121 and connects to the connecting rope 4 within the second section 112 of the elbow 11. This facilitates the connection between the connecting rope 4 passing through the second section 112 and the pin 33, and also enables the elongated through-hole 121 to limit the travel of the float 3. It should be noted that the connecting rope 4 can also be connected to a gas position of the float 3, such as the top of the float 31.

[0064] In one embodiment, the guide rail 12 is disposed in the guide tube 32 and is slidably connected to the guide tube 32. It should be noted that the guide rail 12 can also be disposed outside the floating member 3, and the floating member 3 and the guide rail 12 are slidably connected.

[0065] In one embodiment, the weight ratio of the float 3 to the valve core 22 ranges from 2:1 to 20:1. This weight ratio is tailored to the density of the liquid. The lower the density of the liquid, the smaller the weight ratio of the float 3 to the valve core 22, resulting in a lower required buoyancy. For example, if the valve core 22 weighs 1 kg, the weight of the float 3 should be between 2 kg and 20 kg.

[0066] When filling a pressure vessel, liquid is pressurized by the filling equipment's hydraulic pump and sequentially passes through the liquid inlet pipe 300 and the filling limiter 100 into the tank body 200. During the filling process, the liquid level in the tank body 200 gradually rises. When the liquid surface contacts the float 3, the float 3 begins to rise with the liquid surface due to buoyancy, causing the valve core 22, connected to the float 3 via the connecting rope 4, to descend. When the liquid surface reaches the set filling level, the valve core 22 descends to a position between the first and second fluid passage sections. Under the impact of the liquid, the valve core 22 is pressed to block the second fluid passage section 2112, thereby blocking the liquid outlet on the second fluid passage section 2112. This prevents liquid from entering the tank body 200 through the fluid passage 211, causing the liquid flow rate to decrease rapidly. The detector detects the decrease in liquid flow rate at the liquid inlet pipe 300, and the filling equipment, based on the detector's signal, controls the hydraulic pump to stop operation, thereby stopping filling. This achieves a limited filling of the tank body 200 and prevents overfilling. When the liquid inside the tank body 200 is used, the liquid level drops, the floating member 3 also drops, and the valve core 22 is also pulled up by the floating member 3, so that it can be refilled and used. The filling and use cycle is repeated in this way.

[0067] The charging limiter 100 of the present application has at least the following advantages: (1) When the pressure vessel is full, the filling limiter 100 can automatically cut off the fluid channel 211 to stop filling, thereby avoiding the problem of overfilling. There is no overflow during the filling process, and the filling rate is more accurate.

[0068] (2) The size of the filling limit device 100 is not affected by the volume of the tank body 200, and the material consumption is small, and the cost is low.

[0069] (3) The filling limit device 100 is a purely mechanical structure and can be used in pressure vessels storing flammable and explosive media.

[0070] (4) Applicable to low-density liquids. When the buoyancy of the float 3 is insufficient and the float 3 cannot be lowered, the gravity difference between the float 3 and the valve core 22 is adjusted, that is, the weight of the valve core 22 is increased or the power of the float 3 is reduced, so that the valve core 22 can be lowered, thereby cutting off the pipeline and stopping filling. This makes it suitable for filling liquids of different densities and has a wide range of applications. The gravity of the valve core 22 + the buoyancy of the float 3 > the gravity of the float 3.

[0071] The pressure vessel filling limit device 100 of the present application includes a support member 1, a valve member 2, a float member 3, and a connecting rope 4. The support member 1 is connected to the tank body 200 of the pressure vessel, and the valve member 2 is connected to the support member 1. The valve member 2 includes a valve body 21 and a valve core 22 for controlling the flow of a fluid passage 211 in the valve body 21. The float member 3 is disposed within the tank body 200 of the pressure vessel and moves up and down with the rise and fall of the liquid level in the tank body 200. The float member 3 is connected to the valve core 22 via the connecting rope 4. When the liquid level in the tank body 200 reaches a set position, the buoyancy of the float member 3 acts on the valve core 22 via the connecting rope 4, causing the valve core 22 to close the fluid passage 211 of the valve body 21 and stop filling the tank body 200 with liquid, thereby preventing the tank body 200 from being overfilled. Furthermore, the filling limit device 100 is not affected by the volume of the tank body 200, thus having a wider range of applications and higher accuracy. Among them, the floating member 3 and the valve member 2 are both located below the supporting portion 1131 of the supporting member 1, and the middle part of the connecting rope 4 is connected to the supporting portion 1131 for guidance, so that when the floating member 3 floats upward, the valve core 22 descends, and the buoyancy of the floating member 3 does not need to overcome the weight of the valve core 22, that is, the buoyancy of the floating member 3 overcomes the gravity difference between the floating member 3 and the valve core 22 to achieve the descent of the valve core 22, thereby reducing the buoyancy requirement of the floating member 3, avoiding the problem of overfilling caused by the valve core 22 of the filling limit device 100 being unable to close the fluid channel 211 of the valve body 21 due to insufficient buoyancy, thereby improving safety; it also enables the filling limit device 100 to be applied to the filling condition of low-density liquids and to ensure the accuracy of filling.

[0072] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are intended to be illustrative and exemplary rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. All changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A filling limit device for a pressure vessel, characterized in that: include: A support member, used to be connected to the tank body of the pressure vessel, wherein the support member is provided with a supporting portion; a valve member connected to the support member and located below the support portion of the support member; the valve member includes a valve body and a valve core, the valve body is provided with a fluid channel, the fluid channel includes a liquid inlet for communicating with the liquid inlet pipe and a liquid outlet for communicating with the interior of the tank body, and the valve core is movably disposed within the valve body; a floating member, arranged inside the tank body, and floating up and down as the liquid level inside the tank body rises and falls; the floating member is located below the supporting portion of the supporting member; a connecting rope, the connecting rope being guide-connected to the supporting portion of the supporting member, with both ends of the connecting rope being connected to the valve core and the floating member respectively; When the floating member floats up, the valve core descends to cut off the fluid passage; When the floating member descends, the valve core is driven to rise to the communicating fluid channel via the connecting rope.

2. The filling limit device for a pressure vessel according to claim 1, characterized in that: The valve body is further provided with an accommodating cavity, which is located above the fluid channel and communicates with the fluid channel; The valve core is movable between the accommodating chamber and the fluid channel. When the valve core is located inside the fluid channel, the fluid channel is cut off. When the valve core moves upward to the accommodating chamber, the fluid channel is connected.

3. The filling limit device for a pressure vessel according to claim 2, characterized in that: The valve core is spherical, and the diameter of the valve core is larger than the caliber of the fluid channel.

4. The filling limit device for a pressure vessel according to claim 2, characterized in that: The fluid channel includes a first fluid channel section and a second fluid channel section, the first fluid channel section is connected to the liquid inlet and the accommodating cavity, and the second fluid channel section is connected to the accommodating cavity and the liquid outlet; When the valve core cuts off the fluid channel, the valve core blocks the second fluid channel section.

5. The filling limiting device for a pressure vessel according to claim 2, characterized in that: The top surface of the valve body is provided with a connection port communicating with the accommodating cavity, and the connection rope passes through the connection port and is connected to the valve core; When the valve core cuts off the fluid channel, the liquid inlet pipe is connected to the outer space of the floating member through the connecting port; The flow area of ​​the connecting port is smaller than the flow area of ​​the fluid channel.

6. The filling limiting device for a pressure vessel according to claim 5, characterized in that: The support member is provided with a channel, one end of the channel is communicated with the connection port, and the other end of the channel is communicated with the peripheral space of the floating member; The connecting rope is passed through the channel.

7. The filling limit device for a pressure vessel according to claim 6, characterized in that: The channel includes a first channel, a second channel and a third channel, the first channel and the second channel are spaced apart and arranged vertically, and the third channel connects the upper end of the first channel and the upper end of the second channel; One end of the connecting rope passes through the first channel to be connected to the valve core; The other end of the connecting rope passes through the second channel to be connected to the floating member.

8. The filling limiting device for a pressure vessel according to claim 6, characterized in that: The support member includes a curved pipe, and the channel is provided on the curved pipe; One end of the elbow is connected to the valve body, and the other end extends downward and is slidably connected to the floating member.

9. The filling limiting device for a pressure vessel according to claim 8, characterized in that: The floating member includes a float and a guide tube, wherein the guide tube vertically penetrates the float and is fixedly connected to the float; The guide pipe is slidably connected to one end of the bent pipe away from the valve body.

10. The filling limiting device for a pressure vessel according to claim 1, characterized in that: The support member includes a guide rail, which is vertically arranged. The floating member is slidably connected to the guide rail, so that the floating member can slide up and down along the guide rail.

11. The filling limiting device for a pressure vessel according to claim 1, characterized in that: The floating member has a hollow cavity inside, and a pressure balancing through hole is provided on the floating member, and the pressure balancing through hole is communicated with the cavity.

12. The filling limiting device for a pressure vessel according to claim 11, characterized in that: The pressure balancing through hole is arranged on the top or bottom of the floating member.

13. The filling limiting device for a pressure vessel according to claim 1, characterized in that: The weight ratio of the floating member to the valve core ranges from 2:1 to 20:1; The diameter of the valve core ranges from 8mm to 50mm; The wall thickness of the floating part ranges from 0.2 mm to 2 mm, and the diameter ranges from 60 mm to 400 mm.

14. A pressure vessel, characterized in that: It comprises a tank body, a liquid inlet pipe and a filling limit device as described in any one of claims 1 to 13, wherein the tank body is used to store a cryogenic liquid medium, the floating part of the filling limit device is arranged in the tank body, and the fluid channel of the filling limit device is connected to the liquid inlet pipe and the interior of the tank body.

15. The pressure vessel according to claim 14, characterized in that The density of the cryogenic liquid medium is in the range of 0.03 kg / L to 2 kg / L; The pressure range of the low-temperature liquid medium in the tank body is 0.1MPa~4.0MPa.

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