Vacuum relief valve failure prevention device for low-temperature liquid tank car

Abstract

The application discloses a kind of low-temperature liquid tank car vacuum plug failure prevention devices, including vehicle body, the upper surface of the vehicle body is embedded with feed hopper, the inside of the feed hopper is provided with conical sealing plug, the bottom surface of the conical sealing plug is provided with installation groove, the inner top wall of the installation groove is fixedly connected with spring, the bottom end of the spring is fixedly connected with piston plate, and piston plate and the inner wall of installation groove are connected with piston, contact sensor is installed in the inside of the installation groove, and contact sensor is below piston plate, the outside of the vehicle body is provided with automatic air supplementing assembly.The device is cooperated with the cooperation of conical sealing plug, installation groove, spring, piston plate, contact sensor and automatic air supplementing assembly, when negative pressure is generated in the inside of vehicle body, piston plate will be pulled, with contact sensor is removed, automatic air supplementing assembly will work automatically, can air supplement to the inside of vehicle body, to prevent the continuous rise of negative pressure in the inside of vehicle body, to avoid the recess cracking of vehicle body.

Description

Technical Field

[0001] This application relates to the field of cryogenic liquid transport equipment technology, and in particular to a vacuum plug failure prevention device for cryogenic liquid tank trucks. Background Technology

[0002] During the transportation and unloading process of cryogenic liquid tank trucks, the cryogenic liquid inside the tank will continuously vaporize and generate pressure to maintain a slight positive pressure inside the tank. However, after unloading, if there is little liquid remaining in the tank, insufficient vaporization, or a sudden drop in the outside temperature, the pressure inside the tank will drop rapidly and form a negative pressure. At this time, it is necessary to rely on the anti-vacuum plug to draw in air to balance the pressure and prevent the tank from deforming due to excessive pressure difference between the inside and outside.

[0003] Traditional devices only have a single anti-vacuum plug. If the plug gets stuck, the spring fatigues, or the exhaust channel is blocked, the anti-vacuum plug cannot open properly, and the negative pressure inside the tank will continue to rise, causing the tank to dent and the weld to crack. To address this problem, we propose an anti-vacuum plug failure device for cryogenic liquid tank trucks. Utility Model Content

[0004] The purpose of this application is to provide a vacuum plug failure prevention device for cryogenic liquid tank trucks to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A vacuum plug failure prevention device for a cryogenic liquid tank vehicle includes a vehicle body. A feed hopper is embedded in the upper surface of the vehicle body. A conical sealing plug is installed inside the feed hopper. An installation groove is formed on the bottom surface of the conical sealing plug. A spring is fixedly connected to the inner top wall of the installation groove. A piston plate is fixedly connected to the bottom end of the spring, and the piston plate is piston-connected to the inner wall of the installation groove. A contact sensor is installed inside the installation groove and is located below the piston plate. An automatic air replenishment component is installed on the outside of the vehicle body.

[0007] In a further embodiment, the automatic air replenishment component includes a connecting pipe embedded in the outer surface of the vehicle body, one end of which is equipped with a gas filter, and the outer surface of which is equipped with a solenoid valve.

[0008] In a further embodiment, a one-way valve is installed on the outer surface of the connecting pipe.

[0009] In a further embodiment, a conical sleeve is fitted on the outer surface of the conical sealing plug, and the outer surface of the conical sleeve is in contact with the inner wall of the feed hopper.

[0010] In a further embodiment, a sleeve frame is fixedly connected to the upper surface of the conical sealing plug.

[0011] In a further embodiment, a handle is fixedly connected to the upper surface of the conical sealing plug, and the outside of the handle is provided with anti-slip texture.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This application utilizes a combination of a conical sealing plug, mounting groove, spring, piston plate, contact sensor, and automatic air replenishment component. When negative pressure is generated inside the vehicle body, the piston plate is pulled. As the piston plate disengages from the contact sensor, the automatic air replenishment component automatically operates to replenish air into the vehicle body, thereby preventing the negative pressure inside the vehicle body from continuously increasing and thus avoiding dents and cracks in the vehicle body. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the anti-vacuum plug failure device for cryogenic liquid tank trucks.

[0015] Figure 2 This is a three-dimensional structural schematic diagram of the feed hopper of the anti-vacuum plug failure device for cryogenic liquid tank trucks.

[0016] Figure 3 A three-dimensional structural diagram of the automatic gas replenishment component for a vacuum plug failure device used in cryogenic liquid tank trucks.

[0017] In the diagram: 1. Vehicle body; 2. Feed hopper; 3. Conical sealing plug; 4. Automatic air replenishment assembly; 401. Connecting pipe; 402. Gas filter; 403. Solenoid valve; 404. Check valve; 5. Pull handle; 6. Sleeve frame; 7. Conical sleeve; 8. Piston plate; 9. Contact sensor; 10. Mounting slot; 11. Spring. Detailed Implementation

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "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 refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and 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 based on the specific circumstances.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 In this utility model, a vacuum plug failure prevention device for a cryogenic liquid tanker includes a vehicle body 1. A feed hopper 2 is embedded on the upper surface of the vehicle body 1. A conical sealing plug 3 is provided inside the feed hopper 2. The conical sealing plug 3 can achieve a sealing effect on the feed hopper 2. A conical sleeve 7 is fitted on the outer surface of the conical sealing plug 3. The outer surface of the conical sleeve 7 is in contact with the inner wall of the feed hopper 2. The conical sleeve 7 can further fill the gap between the conical sealing plug 3 and the feed hopper 2, thereby improving its sealing effect.

[0021] A sleeve frame 6 is fixedly connected to the upper surface of the conical sealing plug 3. The sleeve frame 6 can be used to seal the conical sealing plug 3 from the outside. A handle 5 is fixedly connected to the upper surface of the conical sealing plug 3. The outside of the handle 5 is provided with anti-slip texture. The handle 5 is provided to facilitate the staff to pull the conical sealing plug 3.

[0022] The bottom surface of the conical sealing plug 3 is provided with an installation groove 10. A spring 11 is fixedly connected to the inner top wall of the installation groove 10. A piston plate 8 is fixedly connected to the bottom end of the spring 11, and the piston plate 8 is piston-connected to the inner wall of the installation groove 10. A contact sensor 9 is installed inside the installation groove 10, and the contact sensor 9 is located below the piston plate 8. When the air pressure inside the vehicle body 1 decreases, it will pull the conical sealing plug 3. At the same time, due to the negative pressure, the piston plate 8 moves and pulls the spring 11 until the piston plate 8 contacts the contact sensor 9. At this time, the contact sensor 9 will send a signal to the control panel, and the control panel will start the automatic air replenishment component 4.

[0023] An automatic air replenishment component 4 is installed on the exterior of the vehicle body 1. The automatic air replenishment component 4 includes a connecting pipe 401 embedded in the outer surface of the vehicle body 1. A gas filter 402 is installed at one end of the connecting pipe 401. A solenoid valve 403 is installed on the outer surface of the connecting pipe 401. When the control panel is activated, the solenoid valve 403 is opened, and the external gas is drawn in by negative pressure and enters the connecting pipe 401 from the gas filter 402. This allows for timely air supply to the interior of the vehicle body 1, preventing the negative pressure inside the vehicle body 1 from continuously increasing and avoiding dents and cracks in the vehicle body 1. A one-way valve 404 is installed on the outer surface of the connecting pipe 401 to prevent gas backflow.

[0024] The working principle of this application is as follows: When the conical sealing plug 3 seals the feed hopper 2, as the air pressure inside the car body 1 decreases, it will pull the conical sealing plug 3. At the same time, due to the negative pressure, the piston plate 8 moves and pulls the spring 11 until the piston plate 8 contacts the contact sensor 9. At this time, the contact sensor 9 will send a signal to the control panel, and the control panel will activate the solenoid valve 403 to open. The external gas will be drawn in by the negative pressure and enter the connecting pipe 401 from the gas filter 402, thereby enabling timely air supply to the inside of the car body 1, preventing the negative pressure inside the car body 1 from continuously increasing, and avoiding the denting and cracking of the car body 1.

[0025] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum relief valve failure prevention device for a cryogenic liquid tank truck, comprising: The vehicle includes a vehicle body (1), with a feed hopper (2) embedded on the upper surface of the vehicle body (1). A conical sealing plug (3) is provided inside the feed hopper (2). An installation groove (10) is provided on the bottom surface of the conical sealing plug (3). A spring (11) is fixedly connected to the inner top wall of the installation groove (10). A piston plate (8) is fixedly connected to the bottom end of the spring (11). The piston plate (8) is piston-connected to the inner wall of the installation groove (10). A contact sensor (9) is installed inside the installation groove (10). The contact sensor (9) is located below the piston plate (8). An automatic air replenishment assembly (4) is provided on the outside of the vehicle body (1).

2. A device for preventing the failure of a vacuum relief valve according to claim 1, characterized in that: The automatic air replenishment component (4) includes a connecting pipe (401) embedded in the outer surface of the vehicle body (1), a gas filter (402) is installed at one end of the connecting pipe (401), and a solenoid valve (403) is installed on the outer surface of the connecting pipe (401).

3. The anti-vacuum plug failure device for cryogenic liquid tank truck according to claim 2, characterized in that: A one-way valve (404) is installed on the outer surface of the connecting pipe (401).

4. The anti-vacuum plug failure device for cryogenic liquid tank truck according to claim 1, characterized in that: The outer surface of the conical sealing plug (3) is fitted with a conical sleeve (7), and the outer surface of the conical sleeve (7) is in contact with the inner wall of the feed hopper (2).

5. The anti-vacuum plug failure device for cryogenic liquid tank truck according to claim 1, characterized in that: The upper surface of the conical sealing plug (3) is fixedly connected to a sleeve (6).

6. The anti-vacuum plug failure device for cryogenic liquid tank truck according to claim 1, characterized in that: A handle (5) is fixedly connected to the upper surface of the conical sealing plug (3), and the outside of the handle (5) is provided with anti-slip texture.

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