A quick connecting filling pipe for liquid nitrogen filling

Abstract

This utility model discloses a quick-connect filling tube for liquid nitrogen refueling, comprising an inner tube, an inner connecting tube, a buffer spring, and an outer connecting tube. The inner connecting tube slides on the inner tube, while the outer connecting tube is fixed to the inner tube. A quick connection and fixation with a stepped tube head is achieved through components such as a ring shaft, connecting rod, extension rod, and resistance block. A torsion spring and connecting shaft are used to adjust the angle of the extension rod, while a slider and moving ring enhance the contact force between the resistance block and the tube head. The buffer spring cushions the connection impact, enabling a quick and stable connection and convenient disconnection of the liquid nitrogen filling tube from the tube head.

Description

Technical Field

[0001] This application relates to the field of liquid nitrogen filling technology, and more specifically to a quick-connect filling tube for liquid nitrogen filling. Background Technology

[0002] Traditional connection methods between the filling tubing and the filling equipment nozzle during liquid nitrogen refueling have several drawbacks. Firstly, the connection process is often cumbersome and time-consuming, affecting refueling efficiency and failing to meet the demands of rapid operations. Secondly, poor connection stability means that the impact of flowing liquid nitrogen can easily cause the connection to detach, leading to safety hazards such as liquid nitrogen leakage. Furthermore, traditional filling tubing is ill-suited to different sizes of stepped nozzles and the complex layout of components near the nozzle, limiting its application. Additionally, the significant impact between components during rapid connection can damage parts, increasing maintenance costs and equipment downtime. Therefore, developing a quick-connect filling tubing for liquid nitrogen refueling that can connect quickly and stably, adapt to various nozzle types, and protect components is of great importance. Summary of the Invention

[0003] To address the aforementioned technical problems, this application resolves the issues of slow connection speed, poor stability, difficulty in adapting to different specifications of pipe heads, and easy damage to parts when connecting liquid nitrogen filling pipes to filling equipment pipe heads.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: a quick-connect filling tube for liquid nitrogen filling, comprising an inner tube, an inner connecting tube, a buffer spring, and an outer connecting tube. A retaining ring is provided on the inner tube, and a buffer spring is fixedly mounted on the retaining ring. The inner connecting tube is slidably mounted on the inner tube. The buffer spring is sleeved on the inner connecting tube and the inner tube. The end of the buffer spring away from the retaining ring is fixedly connected to the end of the inner connecting tube away from the retaining ring. The outer connecting tube is fixedly mounted on the inner tube, and the end of the outer connecting tube near the inner connecting tube is slidably connected to the inner connecting tube. A mounting block is fixedly mounted on the outer connecting tube, and a ring shaft is fixedly mounted on the mounting block. A connecting rod is rotatably mounted on the ring shaft, and an extension rod is fixedly mounted on the connecting rod. A resistance block is fixedly mounted on the end of the extension rod away from the mounting block, and a one-way rubber block for increasing friction is provided on the resistance block. A protrusion is provided on the extension rod, and this protrusion matches the groove of the outer connecting tube.

[0005] Preferably, both the inner and outer connecting pipes are L-shaped structures, with the portions of the inner and outer connecting pipes in contact with the inner pipe located on both sides of the inner pipe retaining ring, and the buffer spring is disposed on the same side as the inner connecting pipe.

[0006] The connecting rod is equipped with two torsion springs, which are sleeved on the ring shaft. The two ends of the torsion springs are fixedly connected to the connecting rod and the ring shaft, respectively.

[0007] Preferably, a connecting shaft is slidably disposed on the connecting rod, and the connecting shaft is provided with equally distributed grooves. The installation positions of the extension rod and the connecting shaft are provided with equally distributed protrusions, which are matched with the grooves of the connecting shaft. The installation angle of the extension rod on the connecting shaft is fixed by the matching relationship between the protrusions and the grooves.

[0008] Preferably, the end of the extension rod away from the mounting block is provided with multiple equally distributed through holes, and the resistance block is provided with holes of the same specifications as the extension rod. The holes of the resistance block are provided with threads, and the resistance block is fixed to the corresponding through hole of the extension rod by bolts. The installation position of the resistance block on the extension rod is adjusted by controlling the matching relationship between the resistance block and the through hole of the extension rod.

[0009] Preferably, the external connecting pipe is provided with multiple grooves, which are divided into two groups and arranged alternately. A slider is slidably provided on the first group of grooves, a moving ring and a support block are fixedly provided on the slider, a rotating ring is rotatably provided on the support block, and a threaded groove is provided on the rotating ring. A threaded block is provided on the extension rod. The second group of grooves cooperates with the protrusion of the extension rod to limit the swing of the extension rod.

[0010] Preferably, an installation rod is fixedly installed on the inner tube, and a rear ring and a stop rod are fixedly installed on the installation rod. The stop rod is used to limit the movement range of the slider, and the rear ring is used for hand-held operation by the operator.

[0011] The technical solution provided in this application has the following advantages compared with the prior art:

[0012] 1. The unique design of this application enables the filling tube to be quickly connected to the stepped tube head. The arc-shaped surface guides the insertion, and the inner connecting tube cooperates with the buffer spring to achieve quick insertion of the tube head. Subsequently, the extension rod and resistance block fix the tube head through simple operation, which greatly saves connection time and improves filling efficiency.

[0013] 2. The one-way rubber block on the resistance block of this application is in close contact with the tube head, providing strong friction. Combined with the threaded engagement of the rotating ring and the extension rod, the contact force is further enhanced, effectively resisting the impact of liquid nitrogen flow, ensuring a stable connection, and avoiding the risk of detachment.

[0014] 3. The angle of the extension rod and the position of the resistance block in this application are flexibly adjustable. The angle of the extension rod is adjusted by matching the groove of the connecting shaft with the protrusion of the extension rod to adapt to pipe heads of different diameters; the resistance block is installed at different positions on the extension rod to avoid interfering parts near the pipe head and improve the versatility of the device.

[0015] 4. The buffer spring in this application uses a smaller spring force specification to buffer the impact when inserting the connector, reduce hard collisions between parts, reduce wear and tear, extend the service life of parts, and reduce maintenance costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this application;

[0017] Figure 2 This is a schematic diagram of the structure of the ring shaft in this application;

[0018] Figure 3 This is a schematic diagram of the extension rod of this application;

[0019] Figure 4 This is a cross-sectional view of this application;

[0020] Figure 5 for Figure 4 Enlarged view of the local structure at point A;

[0021] Figure 6 for Figure 4 Enlarged view of the local structure at point B;

[0022] Figure 7 This is a schematic diagram of the buffer spring structure of this application;

[0023] Figure 8 This is a schematic diagram of the rotating ring structure of this application;

[0024] Figure 9 This is a schematic diagram of the torsion spring of this application.

[0025] In the diagram: 101-Inner tube; 102-Inner connecting tube; 103-Buffer spring; 104-Outer connecting tube; 105-Mounting block; 106-Ring shaft; 107-Torsion spring; 108-Connecting rod; 109-Connecting shaft; 110-Extension rod; 111-Resistance block; 112-Rear ring; 113-Mounting rod; 114-Stopping rod; 115-Moving ring; 116-Slider; 117-Support block; 118-Rotating ring. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0028] like Figures 1 to 9As shown, a quick-connect filling tube for liquid nitrogen filling includes an inner tube 101, an inner connecting tube 102, a buffer spring 103, and an outer connecting tube 104. A retaining ring is provided on the inner tube 101, and the buffer spring 103 is fixedly mounted on the retaining ring. The inner connecting tube 102 is slidably mounted on the inner tube 101. The buffer spring 103 is sleeved on both the inner connecting tube 102 and the inner tube 101. The end of the buffer spring 103 away from the retaining ring is fixedly connected to the end of the inner connecting tube 102 away from the retaining ring of the inner tube 101. The outer connecting tube 104 is fixedly mounted on the inner tube 101. One end of the outer connecting pipe 104 near the inner connecting pipe 102 is slidably connected to the inner connecting pipe 102. An installation block 105 is fixedly installed on the outer connecting pipe 104. A ring shaft 106 is fixedly installed on the installation block 105. A connecting rod 108 is rotatably installed on the ring shaft 106. An extension rod 110 is fixedly installed on the connecting rod 108. A resistance block 111 is fixedly installed at the end of the extension rod 110 away from the installation block 105. A one-way rubber block for increasing friction is provided on the resistance block 111. A protrusion is provided on the extension rod 110, which matches the groove of the outer connecting pipe 104.

[0029] Specifically, the device of this application is suitable for stepped tube heads, that is, it requires a shape that matches the tube head. Figure 4 The shapes of the outer connecting pipe 104 and the right end of the inner pipe 101 shown are mismatched. If they do not match, the connector should first be installed on the pipe to which the filling equipment needs to be installed, and then this device should be installed on the connector at the pipe end.

[0030] like Figure 1 As shown, during use, the operator first controls the device of this application to be inserted into the pipeline of the equipment to be filled. The arc-shaped surface of the right end of the outer connecting pipe 104 guides the device of this application to be smoothly inserted into the pipeline. Then, the inner connecting pipe 102 is pushed by the stepped pipe head, so that the inner connecting pipe 102 slides on the inner pipe 101 and the smaller diameter pipe head is inserted into the inner pipe 101. When the pipeline pushes the inner connecting pipe 102, the inner connecting pipe 102 cooperates with the retaining ring of the inner pipe 101 to compress the buffer spring 103 and slide on the inner pipe 101 and the outer connecting pipe 104. The buffer spring 103 is selected with a smaller elasticity specification to avoid excessive elasticity affecting the speed and stability of the connection.

[0031] Once the tube head is inserted to its limit, meaning the inner connecting tube 102 can no longer be pushed, the extension rod 110 and connecting rod 108 are rotated on the ring shaft 106. This causes the protrusion on the extension rod 110 to insert into the groove of the outer connecting tube 104. The groove of the outer connecting tube 104 restricts the movement of the extension rod 110, allowing it to move in a preset direction. Consequently, the resistance blocks 111 on each extension rod 110 can evenly approach and adhere to the tube head. The one-way rubber blocks on the resistance blocks 111 create a large contact force with the tube head, and the resistance is achieved by controlling the rotation angle of the mounting block 105. The compression deformation of the one-way rubber block 111 further ensures that the resistance block 111 and the tube head are in close contact. Then, the positions of the mounting block 105, extension rod 110, and resistance block 1111 are fixed. The friction between the one-way rubber block and the tube head forms a fixation for the tube head. During subsequent liquid nitrogen injection, the impact of the liquid nitrogen flow will prevent the connection from falling off. The friction between the resistance block 111 and the tube head is used to control the connection and achieve rapid fixation. The compression of the buffer spring 103 prevents excessive impact between parts when quickly inserting the tube head, which could damage the parts and reduce wear and tear on the parts, thus extending their service life.

[0032] like Figures 4 to 6 As shown, both the inner connecting pipe 102 and the outer connecting pipe 104 are L-shaped structures. The parts of the inner connecting pipe 102 and the outer connecting pipe 104 that contact the inner pipe 101 are located on both sides of the retaining ring of the inner pipe 101, and the buffer spring 103 is set on the same side as the inner connecting pipe 102.

[0033] Specifically, such as Figure 4 As shown, both the outer connecting pipe 104 and the inner connecting pipe 102 are provided with a vertical part and a horizontal part. The vertical part of the outer connecting pipe 104 is used to fix it to the inner pipe 101. The vertical part of the inner connecting pipe 102 is slidably connected to the horizontal part of the outer connecting pipe 104. The horizontal part of the inner connecting pipe 102 is slidably connected to the outer wall of the inner pipe 101. The buffer spring 103 is sleeved between the horizontal part of the inner connecting pipe 102 and the horizontal part of the outer connecting pipe 104.

[0034] like Figure 2 and Figure 3 As shown, two torsion springs 107 are provided on the connecting rod 108. The torsion springs 107 are sleeved on the ring shaft 106, and the two ends of the torsion springs 107 are fixedly connected to the connecting rod 108 and the ring shaft 106 respectively.

[0035] like Figures 2 to 4 As shown, a connecting shaft 109 is slidably disposed on the connecting rod 108. The connecting shaft 109 is provided with evenly distributed grooves. The extension rod 110 is provided with evenly distributed protrusions at the installation position of the connecting shaft 109. The protrusions match the grooves of the connecting shaft 109. The installation angle of the extension rod 110 on the connecting shaft 109 is fixed by the matching relationship between the protrusions and the grooves.

[0036] Specifically, the ring shaft 106 is provided with 6 sets of fixing components. Each set includes two torsion springs 107, a connecting rod 108, a connecting shaft 109, an extension rod 110, and a resistance block 111. Each set of fixing components adjusts the angle between the extension rod 110 and the connecting rod 108 by controlling the matching of the groove of the connecting shaft 109 and the protrusion of the extension rod 110. First, the extension rod 110 is installed onto the connecting rod 108, that is, the axis of the mounting hole at the left end of the extension rod 110 coincides with the axis of the mounting hole of the connecting rod 108, and the connecting rod 108 is located between the slots at the left end of the extension rod 110. Then, the angle between the extension rod 110 and the connecting rod 108 is adjusted, that is, the angle between the extension rod 110 and the connecting rod 108 is controlled. 10. Rotate around the axis of the mounting hole and adjust to the appropriate position. Insert the connecting shaft 109 so that the groove of the connecting shaft 109 corresponds to the protrusion of the extension rod 110. Fix the connecting shaft 109 to the connecting rod 108. Drill holes in the connecting rod 108 and the connecting shaft 109 in advance. Fix the connecting rod 108 and the connecting shaft 109 by threading. This fixes the installation angle of the extension rod 110. When connecting the pipe head later, the larger the installation angle of the extension rod 110, the more space can be freed up, making it easier for the staff to insert the device of this application into the pipe head. That is, the larger the circle formed by the multiple resistance blocks 111, the more pipe head specifications can be accommodated, avoiding the connection being affected by the setting of parts near the pipe head.

[0037] like Figures 1 to 6 As shown, the end of the extension rod 110 away from the mounting block 105 is provided with a plurality of equally distributed through holes. The resistance block 111 is provided with holes of the same specifications as the extension rod 110. The holes of the resistance block 111 are provided with threads. The resistance block 111 is fixed to the corresponding through hole of the extension rod 110 by bolts. The installation position of the resistance block 111 on the extension rod 110 is adjusted by controlling the matching relationship between the resistance block 111 and the through hole of the extension rod 110.

[0038] Specifically, multiple holes are provided on the right end of the extension rod 110 and on the resistance block 111 to facilitate flexible installation of resistance blocks 111 of different specifications and to allow for quick replacement when the resistance block 111 becomes excessively worn, resulting in reduced friction. The different installation positions of the resistance block 111 on the extension rod 110, i.e., its distance from the external connecting pipe 104, are designed to accommodate various parts near the pipe head of the filling equipment. If there is interference from other parts, or if the pipe head has a stepped structure with different diameters, and a section of the pipe head does not support contact with the resistance block 111, the contact position between the resistance block 111 and the pipe head can be changed by adjusting the position of the resistance block 111.

[0039] like Figures 1 to 3As shown, the external connecting pipe 104 is provided with multiple grooves, which are divided into two groups and arranged alternately. A slider 116 is slidably arranged on the first group of grooves. A moving ring 115 and a support block 117 are fixedly arranged on the slider 116. A rotating ring 118 is rotatably arranged on the support block 117. The rotating ring 118 is provided with a threaded groove. A threaded block is provided on the extension rod 110. The second group of grooves cooperates with the protrusion of the extension rod 110 to limit the swing of the extension rod 110.

[0040] Specifically, the external connecting tube 104 has a total of 12 grooves, with each group having one groove, and the groups are staggered. The first group of grooves is adapted to the protrusions of the extension rod 110. When the extension rod 110 approaches the external connecting tube 104, the protrusions on the extension rod 110 are inserted into the grooves of the external connecting tube 104, thereby limiting the swing of the extension rod 110, preventing the parts from shaking, and thus ensuring the stability of the contact of the resistance block 111. The second set of grooves is adapted to the sliding of slider 116. When it is necessary to control the resistance block 111 on extension rod 110 to contact the tube head, the operator manually controls the moving ring 115 to move towards the tube head. Thus, the moving ring 115 pushes slider 116 to slide on the second set of grooves on the outer connecting tube 104. Thus, the support block 117 on slider 116 pushes rotating ring 118 to move towards the tube head as well. Then, the inner end face of rotating ring 118 gradually contacts the outer end face of extension rod 110. Because extension rod 110 is in an inclined state, rotating ring 118 pushes extension rod 110 to move towards the axis of inner tube 101. That is, extension rod 110 drives connecting rod 108 through connecting shaft 109. Connecting rod 108 rotates on ring shaft 106 and twists two torsion springs 107, so that the resistance block 111 on extension rod 110 gradually approaches and contacts the tube head. When the rotating ring 118 moves to the threaded block on the extension rod 110, the resistance block 111 is already in contact with the pipe head. Continue to control the movement of the rotating ring 118 so that the threaded groove on the inner end face of the rotating ring 118 engages with the threaded block of the extension rod 110, that is, the threaded block is inserted into the threaded groove. Then, while rotating the rotating ring 118, it continues to move towards the pipe head, thereby using the thread to continue to press down on the extension rod 110, causing the extension rod 110 and the connecting rod 108 to rotate further. In turn, the extension rod 110 further presses down on the resistance block 111, causing the one-way rubber block on the resistance block 111 to be further squeezed and deformed, improving the contact ability. This can increase the friction force when liquid nitrogen is added later.

[0041] Specifically, the one-way rubber block on the resistance block 111 is reset by the elasticity of the rubber material itself, and the one-way rubber block is tilted towards the inner tube 101. After the filling is completed, the operator rotates the rotating ring 118 in the opposite direction to release the downward pressure on the extension rod 110 and the resistance block 111. Then, the moving ring 115 is controlled to return to the initial position, the extension rod 110 loses the downward pressure, and under the action of the two support blocks 117, it drives the rotating ring 118 to reset, thereby resetting the extension rod 110 and the resistance block 111 and moving away from the tube head. Then, under the action of the buffer spring 103, the tube head can be pushed back, so that the device of this application can be quickly disengaged.

[0042] like Figure 3 and Figure 4 As shown, an installation rod 113 is fixedly installed on the inner tube 101. A rear ring 112 and a stop rod 114 are fixedly installed on the installation rod 113. The stop rod 114 is used to limit the movement range of the slider 116, and the rear ring 112 is used for hand-held operation by the operator.

[0043] Specifically, the movement of the slider 116 is restricted by setting the stop rod 114 to avoid excessive movement. When in use, the operator can hold the area of ​​the rear ring 112 with one hand and control the movement of the moving ring 115 and the rotation of the rotating ring 118 with the other hand.

[0044] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A quick-connect filling tube for filling with liquid nitrogen, characterized by: The system includes an inner tube (101), an inner connecting tube (102), a buffer spring (103), and an outer connecting tube (104). A retaining ring is provided on the inner tube (101), and the buffer spring (103) is fixedly mounted on the retaining ring. The inner connecting tube (102) is slidably mounted on the inner tube (101). The buffer spring (103) is sleeved on both the inner connecting tube (102) and the inner tube (101). The end of the buffer spring (103) away from the retaining ring is fixedly connected to the end of the inner connecting tube (102) away from the retaining ring of the inner tube (101). The outer connecting tube (104) is fixedly mounted on the inner tube (101) and is close to the inner connecting tube. One end of the tube (102) is slidably connected to the inner connecting tube (102). An installation block (105) is fixedly installed on the outer connecting tube (104). A ring shaft (106) is fixedly installed on the installation block (105). A connecting rod (108) is rotatably installed on the ring shaft (106). An extension rod (110) is fixedly installed on the connecting rod (108). A resistance block (111) is fixedly installed at the end of the extension rod (110) away from the installation block (105). A one-way rubber block for increasing friction is provided on the resistance block (111). A protrusion is provided on the extension rod (110), which matches the groove of the outer connecting tube (104).

2. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: Both the inner connecting pipe (102) and the outer connecting pipe (104) are L-shaped structures. The parts of the inner connecting pipe (102) and the outer connecting pipe (104) that contact the inner pipe (101) are located on both sides of the retaining ring of the inner pipe (101). The buffer spring (103) is set on the same side as the inner connecting pipe (102).

3. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: Two torsion springs (107) are provided on the connecting rod (108). The torsion springs (107) are sleeved on the ring shaft (106), and the two ends of the torsion springs (107) are fixedly connected to the connecting rod (108) and the ring shaft (106) respectively.

4. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: A connecting shaft (109) is slidably disposed on the connecting rod (108). The connecting shaft (109) is provided with equally distributed grooves. The extension rod (110) and the connecting shaft (109) are provided with equally distributed protrusions at their installation positions. The protrusions match the grooves of the connecting shaft (109). The installation angle of the extension rod (110) on the connecting shaft (109) is fixed by the matching relationship between the protrusions and the grooves.

5. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: The extension rod (110) has multiple equally distributed through holes at the end away from the mounting block (105). The resistance block (111) has holes of the same specifications as the extension rod (110). The holes of the resistance block (111) are threaded. The resistance block (111) is fixed to the corresponding through hole of the extension rod (110) by bolts. The installation position of the resistance block (111) on the extension rod (110) is adjusted by controlling the matching relationship between the through holes of the resistance block (111) and the extension rod (110).

6. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: The external connecting pipe (104) is provided with multiple grooves, which are divided into two groups and are arranged alternately. A slider (116) is slidably arranged on the first group of grooves. A moving ring (115) and a support block (117) are fixedly arranged on the slider (116). A rotating ring (118) is rotatably arranged on the support block (117). A threaded groove is provided on the rotating ring (118). A threaded block is provided on the extension rod (110). The second group of grooves cooperates with the protrusion of the extension rod (110) to limit the swing of the extension rod (110).

7. The quick-connect filling tube for liquid nitrogen filling according to claim 1, characterized in that: An installation rod (113) is fixedly installed on the inner tube (101). A rear ring (112) and a stop rod (114) are fixedly installed on the installation rod (113). The stop rod (114) is used to limit the movement range of the slider (116), and the rear ring (112) is used for the operator to hold.

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