Anti-clogging liquid nitrogen adding device

Abstract

The present invention discloses an anti-clogging liquid nitrogen adding device in the field of adding devices, comprising: a filling funnel, which is eccentrically arranged, and a filter screen for filtering impurities is provided in the filling funnel; a filling pipe, which comprises an inner pipe and an outer pipe, the inner pipe is connected to the bottom of the filling funnel, the inner pipe and the outer pipe are fixed by connecting ribs, a first closing structure for controlling opening and closing is provided in the inner pipe, the outer pipe is passed through the tank plug, and a second closing structure is provided on the top of the outer pipe, and the second closing structure is used to seal the gap between the inner pipe and the outer pipe. The beneficial effects of the present invention are: by arranging the filling funnel on the filling pipe and passing the outer pipe of the filling pipe through the tank plug, it is possible to avoid completely removing the tank plug and the air inlet pipe when adding liquid nitrogen, thereby avoiding ice blockage of the air inlet pipe, and the filling pipe can be sealed to prevent impurities from entering.

Description

Technical Field

[0001] The present invention relates to the technical field of adding devices, and in particular to an anti-clogging liquid nitrogen adding device. Background Art

[0002] Liquid nitrogen is an inert, colorless, odorless, low-viscosity, non-corrosive, non-flammable, and extremely low-temperature transparent liquid. When it vaporizes, it absorbs a large amount of heat, which can cause frostbite on contact. Liquid nitrogen is also an excellent low-temperature refrigerant and can be used in various scientific experiments and industrial production.

[0003] For some tanks that use liquid nitrogen for normal temperature and pressure air intake refrigeration, when liquid nitrogen is lacking, liquid nitrogen needs to be added in time. The existing adding method requires removing the tank plug that seals the tank body and the air intake pipe plugged on the tank plug, and pouring liquid nitrogen into the tank body through the tank opening. The disadvantage of this filling method is that when the air intake pipe is removed from the tank body, it is easy to cause the pipe opening of the air intake pipe to be blocked by ice due to the large temperature difference between the external environment and the tank body. In addition, when pouring liquid nitrogen, impurities in the air and ice debris on the air intake pipe will also enter the tank body, causing pollution to the substances that need to be stored inside.

[0004] To this end, we propose an anti-clogging liquid nitrogen adding device. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides an anti-clogging liquid nitrogen adding device.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] A blockage-resistant liquid nitrogen addition device comprises: a filling funnel, which is eccentrically arranged and provided with a filter screen for filtering impurities; a filling pipe, which comprises an inner pipe and an outer pipe, wherein the inner pipe is connected to the bottom of the filling funnel and is fixed to the outer pipe by connecting ribs; a first closing structure for controlling opening and closing is provided in the inner pipe; the outer pipe is passed through a tank plug and a second closing structure is provided on the top of the outer pipe, wherein the second closing structure is used to seal the gap between the inner pipe and the outer pipe.

[0008] By connecting the outer tube to the tank plug, liquid nitrogen can be added directly into the tank body through the filling funnel, and the gap between the inner tube and the outer tube is used to discharge the gas generated during filling. The first sealing mechanism and the second sealing mechanism are provided so that after the liquid nitrogen is added, the first sealing mechanism can seal the inner tube, and the second sealing mechanism can seal the gap between the inner tube and the outer tube to prevent the liquid nitrogen from volatilizing rapidly when it contacts the atmosphere. This arrangement can avoid completely removing the tank plug and the air inlet pipe when filling with liquid nitrogen, and avoid the air inlet pipe from being blocked by ice when it contacts the atmosphere. A filter is provided in the filling funnel to filter impurities and prevent them from entering the tank body.

[0009] It is further defined that the outer tube includes a sealing section, a connecting section, a clamping section, an upper limit ring and a lower limit ring; the sealing section, the connecting section and the clamping section are arranged in sequence from top to bottom, the upper limit ring is arranged at the top of the connecting section, the lower limit ring is arranged at the top of the clamping section, the lower limit ring and the bottom of the connecting section are connected by threads, when the threads between the lower limit ring and the connecting section are fully engaged, the spacing between the lower limit ring and the upper limit ring matches the thickness of the tank plug, so that the upper limit ring and the lower limit ring seal the connecting section and the tank plug; the tank plug is clamped by arranging the upper limit ring and the lower limit ring on the outer tube to achieve sealing between the connecting section and the tank plug, and sealing by such a clamping method can make the opening accuracy requirements on the tank plug lower, and prevent the internal gas from leaking from between the connecting section and the tank plug, the lower limit ring and the connecting section are convenient to install by threaded connection, and the structure is very stable.

[0010] It is further defined that the inner tube is U-shaped and includes a first vertical section, a horizontal section and a second vertical section; the filling funnel is connected to the top of the first vertical section, the outer tube is sleeved on the second vertical section, and the first closed structure is arranged in the second vertical section; the inner tube is arranged in this way to avoid obstruction between the huge volume of the filling funnel and the air intake pipe.

[0011] It is further defined that the first closing structure includes a sealing plug, a plug rod, a limit block and a accommodating tube; the accommodating tube is arranged at the top of the second vertical section and is connected to the second vertical section, the sealing plug is arranged in the second vertical section, the bottom end of the plug rod is fixedly connected to the sealing plug, and the top end passes through the accommodating tube; the limit block is arranged on the plug rod outside the accommodating tube; when the limit block contacts the top of the accommodating tube, the sealing plug seals the second vertical section and the horizontal section; when the top of the sealing plug contacts the top of the accommodating tube, the sealing plug is completely located in the accommodating tube, and the second vertical section and the horizontal section are unsealed.

[0012] The sealing plug is arranged in this way so that it can completely seal the second vertical section and the horizontal section in a sealed state. The sealing plug is located at the connection between the horizontal section and the second vertical section, which can effectively prevent impurities in the containing tube from entering the second vertical section and the horizontal section.

[0013] It is further defined that the second closed structure includes a mounting ring and a sealing ring; the outer edge of the mounting ring is bent downward to form a mounting sleeve, the inner diameter of the mounting ring matches the outer diameter of the inner tube, the sealing ring is arranged on the bottom surface of the mounting ring, the inner diameter of the sealing ring matches the outer diameter of the inner tube, and the outer diameter matches the inner diameter of the outer tube, and the mounting sleeve and the outer tube are clamped; by clamping the mounting sleeve and the outer tube, the sealing ring is placed in the gap between the inner tube and the outer tube to complete the sealing, and the clamping fixing structure is simple and easy to operate.

[0014] It is further defined that two clamping rods are provided on the inner wall of the mounting collar relative to each other, and two clamping grooves are provided on the outer wall of the outer tube corresponding to the clamping rods. Each clamping groove is opened and inclined downward around the outer tube, and a horizontal groove section is provided at the bottom of the clamping groove, and the extension direction of the horizontal groove section is opposite to the inclined direction of the upper part of the clamping groove; the mounting collar is rotatably connected to the outer tube by cooperating with the clamping groove and the clamping rod arranged in an inclined annular direction, which can avoid multiple turns of the threaded connection, and the clamping can be completed by rotating less than one turn. The horizontal groove section can play a limiting role to prevent the mounting collar from being rotated out along the clamping groove.

[0015] It is further defined that a plurality of lower connecting rings are evenly spaced on the mounting collar, and an upper connecting ring is provided at a position corresponding to the lower connecting ring on the limit block. The upper connecting ring and the lower connecting ring are connected by a tension spring. When the sealing plug and the sealing ring are both in a sealed state, the tension spring is in a pre-tightened state. The tension spring is arranged in this way so that when the mounting collar is tightened, the tension spring will also pull the limiting block downward, and the downward movement of the limiting block drives the sealing plug downward to complete the sealing. When the seal needs to be released, the mounting collar is unscrewed. At this time, the clamping rod and the clamping groove on the mounting collar are disengaged and are in a free state. The seal of the first closed structure can be released by pulling the limit block upward, which is easy to operate.

[0016] It is further defined that the limit block includes a rotating block and a fixed block, the fixed block is connected to the plug rod, the rotating block and the fixed block are rotatably connected, and the upper connecting ring is provided on the rotating block; the limit block is arranged in this way so that when the mounting ring rotates, the rotating block will also rotate, thereby avoiding large-angle distortion of the tension spring.

[0017] It is further defined that the filter screen is arranged at the bottom of a filter cartridge, the outer diameter of the filter cartridge matches the inner diameter of the top of the filling funnel, the top edge of the filter cartridge is folded outward to form a hanging edge, and a dust cover is hingedly provided on the hanging edge; the filter screen and filter cartridge are arranged in this way, and the top of the filter cartridge is folded outward to form a hanging edge, which can make the filter cartridge easier to remove and the filter screen easier to clean and replace. Since the device is passed through the tank plug, a dust cover is provided to prevent dust in the air from entering the filling funnel.

[0018] The beneficial effects of the present invention are as follows: by arranging the filling funnel on the filling pipe and passing the outer tube of the filling pipe through the tank plug, it is possible to avoid completely removing the tank plug and the air inlet pipe when filling liquid nitrogen, thereby avoiding ice blockage of the air inlet pipe, and the filling pipe can be sealed to prevent impurities from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the connection between the present invention and the tank plug;

[0020] Figure 2 It is a partial cross-sectional view of the present invention;

[0021] Figure 3 It is a simple structural diagram of the card slot;

[0022] Figure 4 for Figure 2 Enlarged schematic diagram of part A.

[0023] The symbols of the components are as follows:

[0024] Filling funnel 1, filter screen 11, filter cartridge 12, hanging edge 13, dust cover 14, filling pipe 2, inner tube 21, first vertical section 211, horizontal section 212, second vertical section 213, snap-in groove 2131, outer tube 22, sealing section 221, connecting section 222, pressing section 223, upper limit ring 224, connecting rib 23, lower limit ring 225, first closing structure 3, sealing plug 31, plug rod 32, limit block 33, rotating block 331, fixed block 332, accommodating tube 34, second closing structure 4, mounting ring 41, mounting collar 411, snap-in rod 412, sealing ring 42, tank plug 5, lower connecting ring 6, upper connecting ring 7, tension spring 8. DETAILED DESCRIPTION

[0025] The specific embodiments of the present invention are described below to facilitate understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the appended claims, these changes are obvious, and all inventions and creations utilizing the concepts of the present invention are protected.

[0026] Example:

[0027] like Figure 1-Figure 4As shown, a blockage-proof liquid nitrogen adding device includes a filling funnel 1, a filling pipe 2, a first closing structure 3 and a second closing structure 44; the filling funnel 1 is eccentrically arranged, and a filter screen 11 for filtering impurities is provided in the filling funnel 1; the filter screen 11 is provided at the bottom of a filter cartridge 12, the outer diameter of the filter cartridge 12 matches the inner diameter of the top of the filling funnel 1, and the top edge of the filter cartridge 12 is folded outward to form a hanging edge 13, and a dust cover 14 is hingedly provided on the hanging edge 13; the filling pipe 2 includes an inner tube 21 and an outer tube 22, the inner tube 21 is connected to the bottom of the filling funnel 1, the inner tube 21 and the outer tube 22 are fixed by a connecting rib 23, the inner tube 21 is provided with a first closing structure 3 for controlling opening and closing, the outer tube 22 is passed through the tank plug 5, and the second closing structure 4 is used to seal the inner tube 21 and The outer tube 22 comprises a sealing section 221, a connecting section 222, a pressing section 223, an upper limit ring 224 and a lower limit ring 225; the sealing section 221, the connecting section 222 and the pressing section 223 are arranged in sequence from top to bottom, the upper limit ring 224 is arranged at the top of the connecting section 222, the lower limit ring 225 is arranged at the top of the pressing section 223, the lower limit ring 225 and the bottom of the connecting section 222 are connected by threads, when the threads between the lower limit ring 225 and the connecting section 222 are fully engaged, the distance between the lower limit ring 225 and the upper limit ring 224 matches the thickness of the tank plug 5, so that the upper limit ring 224 and the lower limit ring 225 can seal the connecting section 222 and the tank plug 5; the inner tube 21 is in a U-shape, comprising a first vertical The filling funnel 1 is connected to the top of the first vertical section 211, the outer tube 22 is sleeved on the second vertical section 213, and the first closing structure 3 is arranged in the second vertical section 213; the first closing structure 3 includes a sealing plug 31, a plug rod 32, a limit block 33 and a receiving tube 34; the receiving tube 34 is arranged at the top of the second vertical section 213 and is connected to the second vertical section 213, the sealing plug 31 is arranged in the second vertical section 213, the bottom end of the plug rod 32 is fixedly connected to the sealing plug 31, and the top end passes through the receiving tube 34; the limit block 33 is arranged on the plug rod 32 outside the receiving tube 34; when the limit block 33 contacts the top of the receiving tube 34, the sealing plug 31 is in contact with the second vertical section 213 and the horizontal section 21 2 achieves sealing; when the top of the sealing plug 31 contacts the top of the accommodating tube 34, the sealing plug 31 is completely located in the accommodating tube 34, and the second vertical section 213 and the horizontal section 212 are released from the seal. The limit block 33 includes a rotating block 331 and a fixed block 332. The fixed block 332 is connected to the plug rod 32, and the rotating block 331 and the fixed block 332 are rotatably connected; the second closing structure 4 includes a mounting ring 41 and a sealing ring 42; the outer edge of the mounting ring 41 is bent downward to form a mounting collar 411, the inner diameter of the mounting ring 41 matches the outer diameter of the inner tube 21, and the sealing ring 42 is provided on the bottom surface of the mounting ring 41. The inner diameter of the sealing ring 42 matches the outer diameter of the inner tube 21, and the outer diameter matches the inner diameter of the outer tube 22. The mounting collar 411 and the outer tube 22 are snap-fitted;Two engaging rods 412 are positioned opposite each other on the inner wall of the mounting collar 411. Two engaging grooves 2131 are defined on the outer wall of the outer tube 22, corresponding to the engaging rods 412. Each engaging groove 2131 extends downwardly, circumferentially around the outer tube 22, and has a horizontal groove section at its bottom that extends in the opposite direction of the inclination of the upper portion of the engaging groove 2131. Several lower connecting rings 6 are evenly spaced on the mounting collar 411. Upper connecting rings 7 are positioned on the rotating block 331 in positions corresponding to the lower connecting rings 6. The upper connecting rings 7 and 6 are connected by a tension spring 8. When the sealing plug 31 and the sealing ring 42 are both sealed, the tension spring 8 is pre-tensioned.

[0028] By connecting the outer tube 22 to the tank plug 5, liquid nitrogen can be directly added to the tank body through the filling funnel 1, and the gap between the inner tube 21 and the outer tube 22 is used to discharge the gas generated during filling, and the first sealing mechanism and the second sealing mechanism can be set so that after the liquid nitrogen is added, the first sealing mechanism can seal the inner tube 21, and the second sealing mechanism can seal the gap between the inner tube 21 and the outer tube 22 to prevent the liquid nitrogen from volatilizing quickly when it contacts the atmosphere. This setting can avoid the tank plug 5 and the air inlet pipe being completely removed when adding liquid nitrogen, and avoids the situation where the air inlet pipe is blocked by ice when it contacts the atmosphere. The filter screen 11 is set in the filling funnel 1 to filter impurities and prevent impurities from entering the tank body; by setting the upper The limiting ring 224 and the lower limiting ring 225 clamp the tank plug 5 to achieve a seal between the connecting section 222 and the tank plug 5. The sealing by such a compression method can make the opening precision requirement on the tank plug 5 lower, and prevent the internal gas from leaking from between the connecting section 222 and the tank plug 5. The lower limiting ring 225 and the connecting section 222 are convenient to install through threaded connection, and the structure is very stable; the inner tube 21 is arranged in this way to avoid the obstruction between the huge volume of the filling funnel 1 and the air inlet pipe; the sealing plug 31 is arranged in this way so that the sealing plug 31 can complete the sealing of the second vertical section 213 and the horizontal section 212 in the sealed state. The sealing plug 31 is located at the connection between the horizontal section 212 and the second vertical section 213 in the sealed state, which can effectively prevent the container from leaking. The impurities in the inner tube 34 enter the second vertical section 213 and the horizontal section 212; by clamping the mounting collar 411 and the outer tube 22, the sealing ring 42 is placed in the gap between the inner tube 21 and the outer tube 22 to complete the seal, and the clamping fixing structure is simple and easy to operate; the mounting collar 411 is rotated and connected to the outer tube 22 by cooperating with the clamping groove 2131 and the clamping rod 412 arranged in an inclined annular direction, which can avoid multiple turns of the threaded connection and complete the clamping by rotating less than one turn. The horizontal groove section can play a limiting role to prevent the mounting collar 411 from being screwed out along the clamping groove 2131; the tension spring 8 is set in this way so that when the mounting collar 411 is tightened, the tension spring 8 will also pull the limit block 33 downward, and the limit block 33 moves downward to drive the sealing The plug 31 moves down to complete the seal. When the seal needs to be released, the mounting ring 411 is unscrewed. At this time, the clamping rod 412 and the clamping groove 2131 on the mounting ring 411 are disengaged and are in a free state. The seal of the first closing structure 3 can be released by pulling the limit block 33 upward, which is easy to operate. The limit block 33 is set in this way so that when the mounting ring 411 rotates, the rotating block 331 will also rotate, avoiding large-angle distortion of the tension spring 8. The filter screen 11 and the filter cartridge 12 are set in this way, and the top of the filter cartridge 12 is folded outward to form a hanging edge 13, which makes the filter cartridge 12 easier to remove and the filter screen 11 easier to clean and replace. Since the device is passed through the tank plug 5, a dust cover 14 is provided to prevent dust in the air from entering the filling funnel 1.

Claims

1. A blockage-resistant liquid nitrogen adding device, characterized in that: include: The filling funnel (1) is eccentrically arranged, and a filter (11) for filtering impurities is provided inside the filling funnel (1); A filling pipe (2) comprising an inner pipe (21) and an outer pipe (22), wherein the inner pipe (21) is connected to the bottom of the filling funnel (1), the inner pipe (21) and the outer pipe (22) are fixed via a connecting rib (23), a first closing structure (3) for controlling opening and closing is provided in the inner pipe (21), the outer pipe (22) is passed through the tank plug (5), and a second closing structure (4) is provided on the top of the outer pipe (22), and the second closing structure (4) is used to seal the gap between the inner pipe (21) and the outer pipe (22); The outer tube (22) comprises a sealing section (221), a connecting section (222), a pressing section (223), an upper limit ring (224) and a lower limit ring (225); the sealing section (221), the connecting section (222) and the pressing section (223) are arranged in sequence from top to bottom, the upper limit ring (224) is arranged at the top of the connecting section (222), the lower limit ring (225) is arranged at the top of the pressing section (223), and the lower limit ring (225) is arranged at the top of the pressing section (223). The ring (225) and the bottom of the connecting section (222) are connected by threads. When the threads between the lower limiting ring (225) and the connecting section (222) are fully engaged, the distance between the lower limiting ring (225) and the upper limiting ring (224) matches the thickness of the tank plug (5), so that the upper limiting ring (224) and the lower limiting ring (225) can achieve a seal between the connecting section (222) and the tank plug (5). The inner tube (21) is U-shaped and includes a first vertical section (211), a horizontal section (212), and a second vertical section (213); the filling funnel (1) is connected to the top of the first vertical section (211), the outer tube (22) is sleeved on the second vertical section (213), and the first closed structure (3) is arranged in the second vertical section (213); The first closing structure (3) comprises a sealing plug (31), a plug rod (32), a limiting block (33) and a receiving tube (34); the receiving tube (34) is arranged at the top of the second vertical section (213) and communicates with the second vertical section (213); the sealing plug (31) is arranged in the second vertical section (213); the bottom end of the plug rod (32) is fixedly connected to the sealing plug (31) and the top end passes through the receiving tube (34); the limiting block (33) is arranged on the plug rod (32) outside the receiving tube (34); When the limiting block (33) contacts the top of the accommodating tube (34), the sealing plug (31) seals the second vertical section (213) and the horizontal section (212); when the top of the sealing plug (31) contacts the top of the accommodating tube (34), the sealing plug (31) is completely located in the accommodating tube (34), and the second vertical section (213) and the horizontal section (212) are released from sealing; The second closed structure (4) comprises a mounting ring (41) and a sealing ring (42); the outer edge of the mounting ring (41) is bent downward to form a mounting collar (411); the inner diameter of the mounting ring (41) matches the outer diameter of the inner tube (21); the sealing ring (42) is arranged on the bottom surface of the mounting ring (41); the inner diameter of the sealing ring (42) matches the outer diameter of the inner tube (21); and the outer diameter matches the inner diameter of the outer tube (22); the mounting collar (411) and the outer tube (22) are snap-connected.

2. The anti-clogging liquid nitrogen addition device according to claim 1, characterized in that: Two clamping rods (412) are provided on the inner wall of the mounting collar (411) in opposite directions. Two clamping grooves (2131) are provided on the outer wall of the outer tube (22) corresponding to the clamping rods (412). Each of the clamping grooves (2131) is provided around the outer tube (22) and is inclined downward. A horizontal groove section is provided at the bottom of the clamping groove (2131). The extending direction of the horizontal groove section is opposite to the inclined direction of the upper portion of the clamping groove (2131).

3. The anti-clogging liquid nitrogen addition device according to claim 2, characterized in that: A plurality of lower connecting rings (6) are evenly spaced on the mounting collar (411), an upper connecting ring (7) is provided on the position of the limiting block (33) corresponding to the position of the lower connecting ring (6), the upper connecting ring (7) and the lower connecting ring (6) are connected by a tension spring (8), and when the sealing plug (31) and the sealing ring (42) are both in a sealed state, the tension spring (8) is in a pre-tightened state.

4. The anti-clogging liquid nitrogen addition device according to claim 3, characterized in that: The limit block (33) comprises a rotating block (331) and a fixed block (332), the fixed block (332) is connected to the plug rod (32), the rotating block (331) and the fixed block (332) are rotatably connected, and the upper connecting ring (7) is provided on the rotating block (331).

5. The anti-clogging liquid nitrogen adding device according to claim 1, characterized in that: The filter screen (11) is arranged at the bottom of a filter cartridge (12). The outer diameter of the filter cartridge (12) matches the inner diameter of the top of the filling funnel (1). The top edge of the filter cartridge (12) is folded outward to form a hanging edge (13). A dust cover (14) is hingedly provided on the hanging edge (13).

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