Carbon dioxide cylinder filling connector

Abstract

The utility model discloses a kind of carbon dioxide gas cylinder filling connector, it is related to gas cylinder filling equipment field.The connector includes inflation connector and the regular hexagon block fixed to its outer wall.Inflation connector side is provided with the pressure relief passage of the communication its inner cavity, regular hexagon block is equipped with the installation cavity and pressure relief structure with the communication of pressure relief passage.Pressure relief structure includes plug, compression spring, movable arm and adjusting bolt.Under normal circumstances, plug seals pressure relief passage under spring pre-tightening force;When inner cavity pressure exceeds preset threshold, pressure pushes plug to open by overcoming spring force, and high-pressure gas is discharged through pressure relief passage and pressure relief port.Spring pre-tightening force can be changed by screwing adjusting bolt, to accurately set pressure relief threshold.The utility model integrates pressure relief function in connector body, can directly, automatically release the abnormal high pressure formed in connector internal due to misoperation or ice block, improves the security of filling operation.

Description

Technical Field

[0001] This utility model relates to the technical field of carbon dioxide cylinder accessories, specifically a carbon dioxide cylinder filling connector. Background Technology

[0002] Carbon dioxide cylinders are widely used in welding, food preservation, fire fighting, industrial refrigeration, and carbonated beverage production, among other fields. During use, a dedicated filling connector is required to connect the cylinder to filling equipment to complete the gas filling process.

[0003] Currently, common filling connectors are generally simple in structure, and their main function is to achieve quick connection and sealing between the gas cylinder valve and the filling pipeline. However, in actual filling operations, especially when filling media such as carbon dioxide that are prone to phase change (throttling and heat absorption can easily lead to icing), certain safety hazards exist. Specifically: First, the flow channels inside the filling connector may be blocked due to carbon dioxide icing (ice blockage) or impurities; second, if the operator misoperates before or after the filling operation (for example, connecting the connector to the gas cylinder valve and then opening the filling source before opening the gas cylinder valve), high-pressure gas will be trapped between the connector body and the closed gas cylinder valve, forming a closed cavity (or "dead zone") where the pressure may rise abnormally.

[0004] If the above situation occurs, the pressure inside the sealed cavity will continue to rise, easily exceeding the pressure limit of the joint or related connecting components. This could not only cause the joint itself to burst, damaging the equipment, but more seriously, the filling joint is often in a free state connected to the filling pipeline at this time. Its accidental detachment or breakage could create a high-speed flying object, posing a great safety threat to on-site operators and surrounding equipment, and causing a serious safety accident.

[0005] While existing filling systems are typically equipped with main pressure relief devices, such as safety valves installed on the filling pipeline or those built into the gas cylinder itself, these safety measures primarily target overpressure protection for the filling pipeline system or the gas cylinder itself. For abnormal pressure increases limited to the closed cavity inside the filling connector due to the aforementioned reasons, existing technologies lack a direct, rapid, and targeted pressure relief protection mechanism.

[0006] Therefore, we propose a carbon dioxide cylinder filling connector. Utility Model Content

[0007] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a carbon dioxide cylinder filling connector. By integrating an adjustable pressure relief valve, this invention can release the deadly high pressure formed inside the connector due to misoperation or ice blockage, thereby improving safety and effectively solving the problems in the background technology.

[0008] (II) Technical Solution To achieve the above objectives, the technical solution adopted by this utility model is as follows: a carbon dioxide cylinder filling connector, including an inflation connector, with internal connecting threads at both ends of the inner cavity of the inflation connector, a regular hexagonal block fixedly installed on the outer wall of the middle part of the inflation connector, a pressure relief channel opened on one side of the inflation connector, the pressure relief channel penetrating to the inner wall of the inflation connector, a pressure relief structure provided on one side of the regular hexagonal block corresponding to the pressure relief channel, the pressure relief structure including an installation cavity, a pressure relief port, a threaded hole, an internal hexagon countersunk adjusting bolt, an arc-shaped top feed head, a guide rod, a movable arm, a guide ring, a compression spring and a plug, the installation cavity being opened inside the regular hexagonal block near the end of the pressure relief channel, and the pressure relief channel communicating with the installation cavity.

[0009] Preferably, the outlet end of the pressure relief channel is connected to the middle of the left side of the mounting cavity. There are two sets of guide rings and guide rods. The two sets of guide rods are fixed on the upper and lower sides of the mounting cavity. The two sets of guide rings are fixed on the upper and lower ends of the outer surface of one side of the movable arm. The guide rings extend through to the outer surface of the other side of the movable arm. The inner wall of the guide ring and the outer wall of the guide rod are in sliding fit.

[0010] Preferably, the plug is normally sealed at the outlet end of the pressure relief channel under the preload of the compression spring; one end of the compression spring is fixedly connected to the plug, and the other end is fixedly connected to the movable arm.

[0011] Preferably, the pressure relief port is located at the upper and lower ends of the regular hexagonal block on the side away from the pressure relief channel, and the pressure relief port extends through the outer wall of the regular hexagonal block. The pressure relief port is used to guide the gas discharged through the pressure relief channel to the outside.

[0012] Preferably, the threaded hole is located in the middle of the outer surface of the mounting cavity at the end away from the pressure relief channel, the internal hexagon countersunk head adjusting bolt passes through the threaded hole, and the outer wall of the internal hexagon countersunk head adjusting bolt and the threaded hole are threadedly engaged.

[0013] Preferably, the arc-shaped top material head is fixed to one end of the internal hexagon countersunk head adjusting bolt near the movable arm, and the arc-shaped top material head is in contact with the plane of the movable arm.

[0014] (III) Beneficial Effects Compared with the prior art, this utility model provides a carbon dioxide cylinder filling connector, which has the following advantages: 1. This carbon dioxide cylinder filling connector integrates a pressure relief structure inside the connector body, making the connector itself an independent safety node. When a closed high-pressure chamber is formed inside the connector due to misoperation or ice blockage, once the pressure exceeds the preset safety threshold, the pressure relief structure can open instantly and automatically to release the pressure, directly discharging the high-pressure medium. This fundamentally avoids the risk of the connector bursting due to overpressure and improves the safety of the entire filling operation process.

[0015] 2. This carbon dioxide cylinder filling connector features an adjustment mechanism consisting of an internal hexagon countersunk adjusting bolt, an arc-shaped top material head, a movable arm, and a compression spring. This mechanism allows for adjustment of the preload force acting on the pressure relief plug. Users can precisely set the trigger pressure of the pressure relief structure according to different filling system pressure levels or safety regulations, enabling the connector to adapt to diverse filling scenarios and operating conditions, thus improving the product's applicability and economy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a carbon dioxide cylinder filling connector according to the present invention.

[0017] Figure 2 This is a side cross-sectional view of a carbon dioxide cylinder filling connector according to the present invention.

[0018] Figure 3 This utility model relates to a carbon dioxide cylinder filling connector. Figure 2 Enlarged view of point A in the middle.

[0019] In the diagram: 1. Inflation connector; 2. Internal connection thread; 3. Regular hexagonal block; 4. Pressure relief structure; 5. Pressure relief channel; 6. Mounting cavity; 7. Pressure relief port; 8. Threaded hole; 9. Internal hexagon countersunk adjusting bolt; 10. Arc-shaped top feed head; 11. Guide rod; 12. Movable arm; 13. Guide ring; 14. Compression spring; 15. Plug. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figure 1-3As shown, this utility model provides a carbon dioxide cylinder filling connector, including a filling connector 1. The inner cavity of the filling connector 1 has internal connecting threads 2 at both ends; one end is used to connect to the carbon dioxide cylinder valve, and the other end is used to connect to the filling equipment pipeline. A regular hexagonal block 3 is fixedly installed on the outer wall of the middle part of the filling connector 1, a design that facilitates installation and disassembly using tools such as wrenches. A pressure relief channel 5 is provided on one side of the filling connector 1, extending through to the inner wall of the filling connector 1 and communicating with its inner cavity.

[0022] A pressure relief structure 4 is provided on one side of the regular hexagonal block 3 corresponding to the pressure relief channel 5. The pressure relief structure 4 includes a mounting cavity 6, a pressure relief port 7, a threaded hole 8, an internal hexagon countersunk head adjusting bolt 9, an arc-shaped ejector head 10, a guide rod 11, a movable arm 12, a guide ring 13, a compression spring 14, and a plug 15. The mounting cavity 6 is located inside the regular hexagonal block 3 near the end of the pressure relief channel 5, and the pressure relief channel 5 is connected to the mounting cavity 6.

[0023] Specifically, the outlet end of the pressure relief channel 5 is connected to the middle of the left side of the mounting cavity 6. There are two sets of guide rings 13 and two sets of guide rods 11, with the two sets of guide rods 11 fixed to the upper and lower sides of the mounting cavity 6. The two sets of guide rings 13 are fixed to the upper and lower ends of the outer surface of one side of the movable arm 12, and the guide rings 13 extend to the other outer surface of the movable arm 12, so that the movable arm 12 is "sleeved" onto the guide rods 11 through the guide rings 13. The inner wall of the guide ring 13 and the outer wall of the guide rod 11 are in a sliding fit, ensuring that the movable arm 12 can move stably along the axial direction of the guide rod 11 without deflection.

[0024] Under the preload of the compression spring 14, the plug 15 seals the outlet end of the pressure relief channel 5 under normal conditions (i.e., when there is no overpressure), blocking the gas passage. One end of the compression spring 14 is fixedly connected to the plug 15, and the other end is fixedly connected to the movable arm 12. Therefore, the preload of the compression spring 14 is transmitted through the movable arm 12 and the plug 15, always attempting to press the plug 15 tightly against the outlet end of the pressure relief channel 5, forming a seal.

[0025] The pressure relief port 7 is located at the top and bottom ends of the regular hexagonal block 3 on the side away from the pressure relief channel 5, and the pressure relief port 7 extends through the outer wall of the regular hexagonal block 3. The pressure relief port 7 is used to safely guide the high-pressure gas discharged through the pressure relief channel 5 to the external environment.

[0026] A threaded hole 8 is located in the middle of the outer surface of the mounting cavity 6, away from the pressure relief channel 5. A countersunk head socket head cap screw 9 passes through the threaded hole 8, and the outer wall of the countersunk head socket head cap screw 9 is threaded into the threaded hole 8. An arc-shaped ejector head 10 is fixed to the end of the countersunk head socket head cap screw 9 near the movable arm 12, and the arc surface of the arc-shaped ejector head 10 is in contact with the plane of the movable arm 12.

[0027] Working principle: Before filling, the trigger pressure of the pressure relief structure must be preset according to the safety pressure requirements of the filling system. Use a tool to tighten the hexagon countersunk adjusting bolt 9. When screwed in clockwise, the hexagon countersunk adjusting bolt 9 moves its end, the arc-shaped top head 10, towards the movable arm 12, pushing the movable arm 12 along the guide rod 11 towards the plug 15 to compress the compression spring 14, thereby increasing the preload force of the compression spring 14 on the plug 15, thus increasing the trigger pressure of the pressure relief structure. Conversely, when screwed out counterclockwise, the preload force of the compression spring 14 decreases, and the trigger pressure decreases. The specific method for determining this threshold adjustment is as follows: Based on the maximum safe working pressure specified by the filling system (hereinafter referred to as "system safe pressure"), set the trigger pressure of the pressure relief structure (hereinafter referred to as "pressure relief threshold"). Generally, the pressure relief threshold should be slightly higher than the system safe pressure, but must be lower than the minimum rated breaking pressure of the filling connector 1 and its key pressure-bearing components. During adjustment, use a dedicated pressure testing device to apply a known, gradually increasing pressure to the inner cavity of the filling connector 1, while observing and recording the pressure value. When the pressure reaches the predetermined pressure relief threshold, the operator uses a tool to fine-tune the hexagonal countersunk adjusting bolt 9 until the plug 15 is just pushed open and gas begins to escape from the pressure relief channel 5. At this point, the preload of the compression spring 14 can be considered calibrated to the required trigger pressure. This process ensures the accuracy and reliability of the pressure relief protection. After adjustment, a pressure test can be performed to ensure the trigger pressure setting is accurate.

[0028] During normal filling, the internal pressure of the inflation connector 1 is lower than the preset safety threshold. The plug 15 is tightly sealed to block the outlet of the pressure relief channel 5 under the pre-tightening force of the compression spring 14, and the filling process proceeds normally.

[0029] If, due to misoperation (such as connecting the high-pressure gas source before the gas cylinder valve is opened) or ice blockage, a closed high-pressure chamber is formed between the inside of the inflation connector 1 and the closed gas cylinder valve, and the pressure there continues to rise and exceeds the preset safety threshold, the gas pressure acting on the plug 15 will overcome the preload of the compression spring 14, pushing the entire assembly of the plug 15, compression spring 14, and movable arm 12 backward (i.e., away from the pressure relief channel 5). As the plug 15 leaves the outlet of the pressure relief channel 5, the seal is broken, and the high-pressure gas immediately rushes into the installation cavity 6 through the pressure relief channel 5, and is finally rapidly discharged into the atmosphere through the pressure relief port 7, achieving rapid pressure relief. This effectively prevents the internal pressure of the inflation connector 1 from becoming too high and causing it to burst, ensuring the safety of personnel and equipment.

[0030] When the internal pressure drops below the safety threshold, the preload of the compression spring 14 pushes the movable arm 12 and the plug 15 back to their original positions, and the plug 15 seals the outlet of the pressure relief channel 5 again.

[0031] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A carbon dioxide cylinder filling connector, comprising a filling connector (1), wherein the two ends of the inner cavity of the filling connector (1) are provided with internal connecting threads (2), characterized in that: A regular hexagonal block (3) is fixedly installed on the outer wall of the middle part of the inflation connector (1). A pressure relief channel (5) is opened on one side of the inflation connector (1). The pressure relief channel (5) extends through the inner wall of the inflation connector (1). A pressure relief structure (4) is provided on one side of the regular hexagonal block (3) corresponding to the pressure relief channel (5). The pressure relief structure (4) includes an installation cavity (6), a pressure relief port (7), a threaded hole (8), an internal hexagon countersunk head adjusting bolt (9), an arc-shaped top material head (10), a guide rod (11), a movable arm (12), a guide ring (13), a compression spring (14), and a plug (15). The installation cavity (6) is opened inside the regular hexagonal block (3) near the end of the pressure relief channel (5), and the pressure relief channel (5) is connected to the installation cavity (6).

2. The carbon dioxide cylinder filling connector according to claim 1, characterized in that: The outlet end of the pressure relief channel (5) is connected to the middle of the left side of the mounting cavity (6). There are two sets of guide rings (13) and guide rods (11). The two sets of guide rods (11) are fixed on the upper and lower sides of the mounting cavity (6). The two sets of guide rings (13) are fixed on the upper and lower ends of the outer surface of one side of the movable arm (12). The guide rings (13) penetrate to the outer surface of the other side of the movable arm (12). The inner wall of the guide ring (13) and the outer wall of the guide rod (11) are in sliding fit.

3. A carbon dioxide cylinder filling connector according to claim 2, characterized in that: Under the pre-tightening force of the compression spring (14), the plug (15) is normally sealed at the outlet end of the pressure relief channel (5); one end of the compression spring (14) is fixedly connected to the plug (15), and the other end is fixedly connected to the movable arm (12).

4. A carbon dioxide cylinder filling connector according to claim 3, characterized in that: The pressure relief port (7) is located at the upper and lower ends of the regular hexagonal block (3) on the side away from the pressure relief channel (5), and the pressure relief port (7) extends through the outer wall of the regular hexagonal block (3). The pressure relief port (7) is used to guide the gas discharged through the pressure relief channel (5) to the outside.

5. A carbon dioxide cylinder filling connector according to claim 4, characterized in that: The threaded hole (8) is located in the middle of the outer surface of the mounting cavity (6) away from the pressure relief channel (5). The internal hexagon countersunk head adjusting bolt (9) passes through the threaded hole (8). The outer wall of the internal hexagon countersunk head adjusting bolt (9) and the threaded hole (8) are threaded together.

6. A carbon dioxide cylinder filling connector according to claim 5, characterized in that: The arc-shaped top material head (10) is fixed to one end of the internal hexagon countersunk head adjusting bolt (9) near the movable arm (12), and the arc-shaped top material head (10) is in contact with the plane of the movable arm (12).

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