A tank mouth assembly of a helium storage tank

Abstract

The present invention relates to the technical field of mechanical equipment, and in particular to a tank mouth assembly of a helium storage tank, comprising a base installed at the tank mouth, the cross section of the base presents a concave structure, a tank cover is arranged at the bottom end of the inner wall of the base, a buffer chamber is formed between the outer surface of the tank cover and the inner wall of the base, and a control valve is arranged in the buffer chamber; in the present invention, the inner wall of the base is arranged in a two-stage step shape, and the step surface located at the bottom of the base is arranged in a conical surface, the bottom end of the sealing gasket is arranged in a conical structure matched with the conical surface, and the air guide pipe is located above the conical surface; when the handle is initially rotated, the air inlet end of the air guide pipe is still blocked by the sealing gasket, so that the helium cannot flow out. Compared with the currently commonly used ball valve structure, the assembly has a certain delay effect, which can avoid the leakage of helium in the helium storage tank due to manual misoperation during transportation, resulting in waste.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment, and in particular to a tank mouth assembly of a helium storage tank. Background Art

[0002] Helium leak detection technology has been widely used to detect leaks in sealing systems, such as detecting the airtightness of engine casings. Since helium is an inert gas and difficult to dissolve in water, helium can be introduced into one end of the casing, and then the casing can be placed in water to determine whether the casing is airtight by checking for bubbles. Currently, helium is usually stored in helium cylinders (helium storage tanks), and most industrial helium cylinders are large gas cylinders with a specification of 50L*15.5Mpa.

[0003] During the transportation of existing helium cylinders, since the helium cylinders are heavy and the bottle mouths are sealed only by valve assemblies, the bottle mouths of the helium cylinders are easily loosened, resulting in leakage of helium in the helium cylinders and waste. Summary of the invention

[0004] The purpose of the present invention is to provide a tank mouth assembly of a helium storage tank, which mainly solves the technical problems mentioned in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A tank mouth assembly of a helium storage tank, comprising a base installed at the tank mouth, the cross section of the base being a concave structure, a tank cover being arranged at the bottom end of the inner wall of the base, a buffer chamber being formed between the outer surface of the tank cover and the inner wall of the base, an air guide tube being arranged on the outer surface of the base, one end of the air guide tube penetrating the side wall of the base and being in communication with the buffer chamber;

[0007] The interior of the tank cover is a hollow structure, a through hole is provided at the bottom end of the inner wall of the tank cover, the bottom end of the through hole passes through the bottom end of the inner wall of the base and is connected to the tank mouth, and a plurality of air inlets and outlets are provided on the outer surface of the tank cover for replenishing or discharging helium inside the tank body;

[0008] A control valve is provided in the buffer chamber for controlling the connection and disconnection between the air guide pipe and the air inlet and outlet. The control valve comprises a valve body, which is installed in the buffer chamber. A sealing gasket is provided at the bottom end of the valve body, which is sleeved on the outer surface of the tank cover. A handle is connected to the top end of the valve body through a valve stem.

[0009] The inner wall of the base is arranged in a two-stage step shape, the step surface at the bottom of the base is arranged in a conical surface, the bottom end of the sealing gasket is arranged in a conical structure adapted to the conical surface, and the air guide pipe is arranged above the conical surface, so as to prevent the control valve from opening by mistake and causing helium leakage.

[0010] Preferably, an internal thread is provided on the side wall at the top of the base, and an external thread matching the internal thread is provided on the outer surface of the valve body. The aperture of the internal thread is larger than the outer diameter of the sealing gasket to prevent the sealing gasket from being scratched by the internal thread during rotation.

[0011] Preferably, a protective cover is provided on the outer side of the valve body, and the protective cover includes a conical sleeve, and the side of the conical sleeve with a larger opening is arranged upward, and the bottom end of the conical sleeve is sleeved on the outer surface of the base, and the end of the air guide tube away from the base passes through and extends to the outer surface of the conical sleeve, and the top end of the conical sleeve extends to the top of the base and is provided with a fixing ring, and the outer surface of the valve stem is provided with a connecting ring, and a conical bellows is provided between the fixing ring and the connecting ring, and the bottom ends of the fixing ring and the connecting ring are evenly provided with a plurality of groups of telescopic parts in an annular shape, so as to ensure the contraction of the conical bellows;

[0012] The telescopic member includes a primary articulated seat and a secondary articulated seat, the primary articulated seat is installed at the bottom end of the fixing ring, the secondary articulated seat is installed at the bottom end of the connecting ring, a telescopic rod is hinged between the opposite surfaces of the primary articulated seat and the secondary articulated seat, a plurality of shaping blocks are sleeved on the outer surface of the telescopic rod, and the plurality of shaping blocks are evenly distributed on the inner wall of the conical corrugated pipe.

[0013] Preferably, an air bag is provided on the top of the outer surface of the conical cylinder, a ventilation port is provided on the inner side of the air bag, and a connecting pipe is provided on the ventilation port;

[0014] One end of the connecting pipe extends to the interior of the airbag and is symmetrically provided with two V-shaped grooves;

[0015] The other end of the connecting pipe penetrates the inner wall of the conical cylinder;

[0016] An exhaust port is arranged on the outer surface of the airbag, and a valve is arranged at the exhaust port.

[0017] Preferably, the outer surface of the tank cover is provided with two groups of air inlets and outlets, each group of air inlets and outlets is provided with at least two air inlets and outlets, and each group of air inlets and outlets is arranged side by side in the vertical direction.

[0018] Preferably, the bottom end of the sealing gasket extends to the bottom of the conical surface and is provided with an elastic member, the elastic member comprises a lower shell provided at the bottom end of the inner wall of the buffer chamber, and an upper shell clamped at the top end of the lower shell, and a plurality of compression springs are evenly provided on the opposite surfaces of the upper shell and the lower shell;

[0019] The top end of the upper shell is flush with the central axis of the air inlet and outlet located at the bottom of the tank cover.

[0020] Preferably, an extrusion block is provided at the bottom end of the sealing gasket, the bottom end of the extrusion block corresponds to the size of the top end of the upper shell, and the extrusion block is configured as a wear-resistant part.

[0021] Preferably, a mounting platform is provided on the outer surface of the valve stem, a sealing ring is sleeved on the outer surface of the mounting platform, and the sealing ring is installed on the top end of the connecting ring through a pressing plate and a fastener.

[0022] Preferably, a plurality of semicircular protrusions are provided on the top side of the outer surface of the sealing gasket, and the outer diameter of the semicircular protrusions is larger than the outer diameter of the sealing gasket.

[0023] Preferably, the semicircular protrusion is arranged at a certain angle along the horizontal direction.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. In the present invention, the inner wall of the base is set to a two-stage step shape, and the step surface located at the bottom of the base is set to a conical surface, the bottom end of the sealing gasket is set to a conical structure adapted to the conical surface, and the air guide tube is located above the conical surface; when the handle is initially rotated, the air inlet end of the air guide tube is still blocked by the sealing gasket, so that helium cannot flow out. Compared with the currently commonly used ball valve structure, this component has a certain delay effect, which can avoid the control valve being opened due to manual misoperation during transportation, resulting in helium leakage in the helium storage tank and causing waste.

[0026] 2. In the present invention, a conical cylinder, a fixing ring, a conical bellows and a connecting ring are arranged on the outer side of the base, so that a protective cover is formed on the outer side of the base. When the sealing gasket of the helium storage tank is damaged during use, resulting in helium leakage, the protective cover is used to store the leaked helium to prevent the helium inside the tank from leaking in large quantities. At the same time, by arranging an air bag, the leaked helium can be recycled through the valve on the exhaust port of the air bag, thereby reducing resource waste. Moreover, the pressure difference generated in the protective cover can be offset by the air bag.

[0027] 3. In the present invention, the user can also quickly distinguish whether the control valve is in an open or closed state during use according to the shape of the tapered bellows, without having to make a judgment by observing the pressure gauge, thereby avoiding damage to the pressure gauge, causing wrong judgments, and resulting in safety hazards during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A three-dimensional diagram of the can mouth assembly of the present invention in an initial state;

[0030] Figure 2 For the present invention Figure 1 Sectional view at AA;

[0031] Figure 3 For the present invention Figure 2 Schematic diagram of the structure in the open state;

[0032] Figure 4 For the present invention Figure 2 A magnified view of point B;

[0033] Figure 5 For the present invention Figure 2 Enlarged view of point C;

[0034] Figure 6 For the present invention Figure 2 A schematic diagram of the structure of a sealing gasket;

[0035] In the figure: base 1, tank cover 2, air inlet and outlet 21, buffer chamber 3, air guide tube 4, control valve 5, valve body 51, valve stem 52, mounting platform 521, handle 53, sealing gasket 54, semicircular protrusion 541, extrusion block 542, protective cover 6, tapered sleeve 61, fixing ring 62, connecting ring 63, tapered bellows 64, telescopic member 65, primary hinge seat 651, secondary hinge seat 652, telescopic rod 653, shaping block 654, airbag 66, ventilation port 661, connecting pipe 662, exhaust port 663, elastic member 7, lower shell 71, slider 711, upper shell 72, slide groove 721, compression spring 73, sealing ring 8, pressing plate 9. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 6 As shown, the present invention provides a tank mouth assembly of a helium storage tank, including a base 1 welded to the tank mouth, the bottom of the base 1 is an arc-shaped structure, which is convenient for welding with the head on the top of the tank body, the cross-section of the base 1 is a concave structure, and a tank cover 2 is fixedly installed at the bottom end of the inner wall of the base 1, so that a buffer chamber 3 is formed between the outer surface of the tank cover 2 and the inner wall of the base 1, and an air guide tube 4 is welded to the outer surface of the base 1, one end of the air guide tube 4 passes through the side wall of the base 1 and is connected to the buffer chamber 3; the interior of the tank cover 2 is a hollow structure, and a through hole is opened at the bottom end of the inner wall of the tank cover 2, and the bottom end of the through hole passes through the inner wall of the base 1 The bottom end is connected with the tank mouth, and the outer surface of the tank cover 2 is provided with multiple air inlet and outlet ports 21 for replenishing or discharging the helium inside the tank body; a control valve 5 is arranged in the buffer chamber 3 for controlling the connection and disconnection between the air guide pipe 4 and the air inlet and outlet ports 21, wherein the control valve 5 comprises a valve body 51, the outer surface of the valve body 51 is threadedly mounted on the inner wall of the base 1, a sealing gasket 54 is fixedly mounted on the bottom end of the valve body 51, and the sealing gasket 54 is sleeved on the outer surface of the tank cover 2, and a handle 53 is fixedly mounted on the top end of the valve body 51 through a valve stem 52, and the handle 53 is detachably mounted on the top end of the valve stem 52.

[0038] Specifically, the inner wall of the base 1 is set to a two-stage step shape, and the step surface located at the bottom of the base 1 is set to a conical surface, the bottom end of the sealing gasket 54 is set to a conical structure adapted to the conical surface, and the air guide tube 4 is located above the conical surface to prevent the control valve 5 from opening instantly and causing helium leakage; at the same time, the bottom end of the sealing gasket 54 extends to the bottom of the conical surface and is also provided with an elastic member 7, which is used to compress the sealing gasket 54 when the control valve 5 is closed, thereby improving the air tightness of the tank mouth assembly.

[0039] In this embodiment, when it is necessary to use the helium in the tank body, the air gun nozzle is first connected to the air guide tube 4 through a pipeline, and then the handle 53 is rotated forward, so that the handle 53 drives the valve body 51 to rotate upward along the inner wall of the base 1 through the valve stem 52, and at the same time, the valve body 51 drives the sealing gasket 54 to rotate upward along the inner wall of the base 1 and the outer surface of the tank cover 2, and the sealing gasket 54 is staggered with the air inlet and outlet 21 on the tank cover 2, so that the helium in the tank body flows into the buffer chamber 3 through the air inlet and outlet 21, and flows into the air guide tube 4 along the conical surface. Since the air guide tube 4 is located above the conical surface, when the handle is initially rotated, the helium in the tank body flows into the buffer chamber 3 through the air inlet and outlet 21, and flows into the air guide tube 4 along the conical surface. When the handle 53 is rotated, the air inlet end of the air duct 4 is still blocked by the sealing gasket 54, so that the helium cannot flow out, which can prevent the control valve 5 from being opened by mistake during transportation, causing helium leakage in the helium storage tank and causing waste; therefore, when the helium stored in the tank is used, it is necessary to further rotate the handle 53 to move the sealing gasket 54 to a certain gap away from the air inlet end of the air duct 4, so that the air inlet of the air duct 4 can be connected with the buffer chamber 3; compared with the currently commonly used ball valve structure, this component has a certain delay effect, which can avoid the waste of resources caused by manual misoperation during transportation.

[0040] Specifically, an internal thread is provided on the side wall at the top of the base 1, and an external thread matching the internal thread is provided on the outer surface of the valve body 51. The aperture of the internal thread is larger than the outer diameter of the sealing gasket 54, which can prevent the sealing gasket 54 from being scratched by the internal thread during rotation.

[0041] Specifically, a protective cover 6 is provided on the outer side of the valve body 51. The protective cover 6 includes a conical sleeve 61, and the side with a larger opening of the conical sleeve 61 is arranged upward. The bottom end of the conical sleeve 61 is welded to the outer surface of the base 1, and the end of the air guide pipe 4 away from the base 1 passes through and extends to the outer surface of the conical sleeve 61. The top end of the conical sleeve 61 extends to the top of the base 1 and is fixedly installed with a fixing ring 62 through a sealing gasket and a fastener. A connecting ring 63 is rotatably installed on the outer surface of the valve stem 52. A conical bellows 64 is fixedly installed between the fixing ring 62 and the connecting ring 63, which is used to form a sealed chamber on the outer side of the base 1, so as to prevent the helium inside the tank from being damaged due to the damage of the sealing gasket 54. A large amount of leakage; at the same time, four groups of telescopic parts 65 are evenly arranged in a ring shape at the bottom ends of the fixed ring 62 and the connecting ring 63, which can play a shaping role for the conical bellows 64, and are used to ensure that the conical bellows 64 can be retracted together after opening; wherein, the telescopic part 65 includes a primary hinge seat 651 and a secondary hinge seat 652, the primary hinge seat 651 is fixedly installed at the bottom end of the fixed ring 62, the secondary hinge seat 652 is fixedly installed at the bottom end of the connecting ring 63, a telescopic rod 653 is hinged between the opposite surfaces of the primary hinge seat 651 and the secondary hinge seat 652, and a plurality of shaping blocks 654 are sleeved on the outer surface of the telescopic rod 653, and a plurality of shaping blocks 654 are evenly fixedly installed on the inner wall of the conical bellows 64.

[0042] It should be noted that the extension length of the telescopic rod 653 in this embodiment is less than the depth of the internal thread, which is used to prevent the valve body 51 from being screwed out from the inner wall of the base 1 and can play a certain limiting role on the valve body 51.

[0043] In this embodiment, in the initial state, the top ends of the connecting ring 63, the fixing ring 62 and the tapered bellows 64 are flush with each other, so that the user can quickly distinguish the state of the control valve 5 during use according to the shape of the tapered bellows 64, without having to make a judgment by observing the barometer, thereby avoiding damage to the barometer, causing wrong judgment, and resulting in potential safety hazards during use; wherein, when the user opens the control valve 5, since the valve stem 52 and the connecting ring 63 are rotatably installed, the valve stem 52 can drive the connecting ring 63 to move upward synchronously, and then the connecting ring 63 stretches the tapered bellows 64 to extend to form a cone shape; at the same time, the connecting ring 63 is The telescopic rod 653 is extended by pulling it through the secondary articulated seat 652, so that the tapered bellows 64 can drive the shaping block 654 to slide along the outer surface of the telescopic rod 653 during the extension process, which can play a certain shaping role on the tapered bellows 64 and prevent the tapered bellows 64 from being damaged due to excessive deformation during the extension process; when the user closes the control valve 5, the valve stem 52 drives the connecting ring 63 to move downward, and the connecting ring 63 drives the telescopic rod 653 to retract through the secondary articulated seat 652, and compresses the tapered bellows 64 to shrink. At the same time, under the action of the shaping block 654, the tapered bellows 64 can be restored to its initial state.

[0044] Specifically, since a sealed chamber is formed between the protective cover 6 and the base 1, the volume inside the sealed chamber will increase or decrease accordingly during the stretching or compression of the conical bellows 64, thereby forming a certain pressure difference with the outside world, which is likely to have a certain impact on the sealing of the control valve 5; therefore, in order to balance the pressure difference generated by the conical bellows 64 when it is deformed, an air bag 66 is fixedly installed on the top of the outer surface of the conical cylinder, and a ventilation port 661 is opened on the inner side of the air bag 66, and a connecting pipe 662 is fixedly installed on the ventilation port 661; one end of the connecting pipe 662 extends to the interior of the air bag 66, and two V-shaped grooves are symmetrically opened to prevent the end of the connecting pipe 662 from being blocked by the inner wall of the air bag 66 and unable to inhale, and the other end of the connecting pipe 662 passes through the inner wall of the conical cylinder.

[0045] Among them, when the user opens the control valve 5, the volume in the sealed chamber will increase, so that the pressure becomes smaller, and the gas in the airbag 66 can be extracted to offset the pressure difference; when the user closes the control valve 5, the volume in the sealed chamber will decrease, so that the pressure becomes larger, and the gas in the sealed chamber can be discharged into the airbag 66 to offset the pressure difference; and, an exhaust port 663 is provided on the outer surface of the airbag 66, and a manual valve is installed at the exhaust port 663; when the helium inside the tank leaks and flows into the sealed chamber, it will flow into the airbag 66 as the gas rises, and then the outlet of the manual valve is connected to the air inlet end of the helium recovery device through a pipeline, and then the manual valve is opened to discharge the helium inside the tank, and the control valve 5 is replaced.

[0046] Specifically, two groups of air inlets and outlets 21 are provided on the outer surface of the tank cover 2, each group of air inlets and outlets 21 is provided with at least two air inlets and outlets 21, and each group of air inlets and outlets 21 is arranged side by side in the vertical direction; wherein, during the opening process of the control valve 5, as the sealing gasket 54 moves upward, the multiple air inlets and outlets 21 will be gradually opened in sequence, which can play a role in regulating the air pressure; and, since the sealing gasket 54 rotates and moves upward with the valve body 51, the air pressure regulation can be accurately controlled.

[0047] Specifically, the elastic member 7 includes a lower shell 71 installed at the bottom end of the inner wall of the buffer chamber 3, and the outer surface of the lower shell 71 is clamped with the upper shell 72; the cross-sections of the lower shell 71 and the upper shell 72 are both concave structures, and the inner wall of the upper shell 72 is provided with a slide groove 721, and the top of the lower shell 71 is slidably connected to the slide groove 721 through a slider 711; a plurality of compression springs 73 are evenly fixedly installed on the opposite surfaces of the upper shell 72 and the lower shell 71; wherein, when the control valve 5 is closed, the sealing gasket 54 moves downward under the drive of the valve body 51, and when the bottom end of the sealing gasket 54 presses against the upper shell 72 The top of the upper shell 72 and as it continues to move downward, it will press the upper shell 72 downward, and then, under the elastic force of the compression spring 73, the bottom end of the sealing gasket 54 will be pushed upward, so that the side wall of the sealing gasket 54 is in better contact with the outer surface and the conical surface of the tank cover 2, thereby enhancing the sealing performance; and the top of the upper shell 72 is flush with the central axis of the air inlet and outlet 21 at the bottom of the tank cover 2, so that the sealing gasket 54 can return the helium remaining in the buffer chamber 3 to the tank body through the air inlet and outlet 21 at the bottom of the tank cover 2 during the downward movement, thereby avoiding that the control valve 5 is not closed properly.

[0048] Specifically, the bottom end of the sealing gasket 54 is fixedly connected to an extrusion block 542, and the bottom end of the extrusion block 542 corresponds to the top size of the upper shell 72, which can prevent the bottom end of the sealing gasket 54 from being deformed by force during the downward rotation; wherein, the extrusion block 542 is configured as a wear-resistant part, which can increase the service life.

[0049] Specifically, a mounting platform 521 is provided on the outer surface of the valve stem 52, and a sealing ring 8 is sleeved on the outer surface of the mounting platform 521. The cross section of the sealing ring 8 is C-shaped. The sealing ring 8 is fixedly mounted on the top of the connecting ring 63 by a pressing plate 9 and fasteners, so that when the valve stem 52 rises or moves downward, the outer surface of the mounting platform 521 can be ensured to be in full contact with the inner wall of the sealing ring 8; wherein, the inner wall of the connecting ring 63 is in the shape of a countersunk hole, and a plurality of threaded blind holes are provided on the top of the inner wall of the connecting ring 63, and a plurality of screws are provided on the top of the pressing plate 9, and the bottom ends of the plurality of screws sequentially penetrate the pressing plate 9 and the top of the sealing ring 8, and are threadedly connected to the inner wall of the threaded blind hole, so as to facilitate the disassembly and replacement of the sealing ring 8.

[0050] Specifically, a plurality of semicircular protrusions 541 are provided on the top side of the outer surface of the sealing gasket 54, and the outer diameter of the semicircular protrusion 541 is larger than the outer diameter of the sealing gasket 54, which can enhance the airtightness between the sealing gasket 54 and the base 1; the semicircular protrusion 541 is arranged at a certain angle along the horizontal direction to facilitate the installation of the sealing gasket 54.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tank mouth assembly of a helium storage tank, characterized in that: The invention comprises a base (1) installed at the mouth of a tank, the cross section of the base (1) being a concave structure, a tank cover (2) being arranged at the bottom end of the inner wall of the base (1), a buffer chamber (3) being formed between the outer surface of the tank cover (2) and the inner wall of the base (1), an air guide tube (4) being arranged on the outer surface of the base (1), one end of the air guide tube (4) penetrating the side wall of the base (1) and being in communication with the buffer chamber (3); The interior of the tank cover (2) is a hollow structure, the bottom end of the inner wall of the tank cover (2) is provided with a through hole, the bottom end of the through hole passes through the bottom end of the inner wall of the base (1) and is connected to the tank mouth, and the outer surface of the tank cover (2) is provided with a plurality of air inlets and outlets (21) for replenishing or discharging helium inside the tank body; A control valve (5) is arranged in the buffer chamber (3) for controlling the connection and disconnection between the air guide pipe (4) and the air inlet and outlet (21); the control valve (5) comprises a valve body (51), the valve body (51) is installed in the buffer chamber (3), a sealing gasket (54) is arranged at the bottom end of the valve body (51), the sealing gasket (54) is sleeved on the outer surface of the tank cover (2), and the top end of the valve body (51) is connected to a handle (53) via a valve stem (52); The inner wall of the base (1) is arranged in a two-stage step shape, the step surface at the bottom of the base (1) is arranged in a conical surface, the bottom end of the sealing gasket (54) is arranged in a conical structure adapted to the conical surface, and the air guide tube (4) is located above the conical surface, so as to prevent the control valve (5) from opening by mistake and causing helium leakage.

2. The tank mouth assembly of a helium storage tank according to claim 1, characterized in that: An internal thread is provided on the uppermost side wall of the base (1), and an external thread matching the internal thread is provided on the outer surface of the valve body (51). The hole diameter of the internal thread is larger than the outer diameter of the sealing gasket (54), so as to prevent the sealing gasket (54) from being scratched by the internal thread during rotation.

3. The tank mouth assembly of a helium storage tank according to claim 1, characterized in that: A protective cover (6) is arranged on the outer side of the valve body (51), and the protective cover (6) includes a conical sleeve (61). The side of the conical sleeve (61) with a larger opening is arranged upwards. The bottom end of the conical sleeve (61) is sleeved on the outer surface of the base (1), and the end of the air guide tube (4) away from the base (1) passes through and extends to the outer surface of the conical sleeve (61). The top end of the conical sleeve (61) extends to the top of the base (1) and is provided with a fixing ring (62). A connecting ring (63) is arranged on the outer surface of the valve stem (52). A conical bellows (64) is arranged between the fixing ring (62) and the connecting ring (63). The bottom ends of the fixing ring (62) and the connecting ring (63) are evenly provided with a plurality of groups of telescopic parts (65) in an annular shape, so as to ensure the contraction of the conical bellows (64). The telescopic member (65) comprises a primary articulated seat (651) and a secondary articulated seat (652), wherein the primary articulated seat (651) is mounted on the bottom end of the fixing ring (62), and the secondary articulated seat (652) is mounted on the bottom end of the connecting ring (63), a telescopic rod (653) is hinged between the opposite surfaces of the primary articulated seat (651) and the secondary articulated seat (652), and a plurality of shaping blocks (654) are sleeved on the outer surface of the telescopic rod (653), and the plurality of shaping blocks (654) are evenly distributed on the inner wall of the conical bellows (64).

4. The tank mouth assembly of a helium storage tank according to claim 3, characterized in that: An air bag (66) is provided at the top of the outer surface of the conical sleeve (61), a ventilation port (661) is provided on the inner side of the air bag (66), and a connecting pipe (662) is provided on the ventilation port (661); One end of the connecting tube (662) extends to the interior of the air bag (66) and is symmetrically provided with two V-shaped grooves; The other end of the connecting pipe (662) passes through the inner wall of the conical sleeve (61); An exhaust port (663) is provided on the outer surface of the air bag (66), and a valve is provided at the exhaust port (663).

5. The tank mouth assembly of a helium storage tank according to claim 2, characterized in that: The outer surface of the tank cover (2) is provided with two groups of air inlets and outlets (21), each group of the air inlets and outlets (21) is provided with at least two inlets and outlets, and each group of the air inlets and outlets (21) is arranged side by side in the vertical direction.

6. The tank mouth assembly of a helium storage tank according to claim 5, characterized in that: The bottom end of the sealing gasket (54) extends to below the conical surface and is provided with an elastic member (7), the elastic member (7) comprising a lower shell (71) provided at the bottom end of the inner wall of the buffer chamber (3), and an upper shell (72) clamped on the top end of the lower shell (71), and a plurality of compression springs (73) are evenly provided on the opposite surfaces of the upper shell (72) and the lower shell (71); The top end of the upper shell (72) is flush with the central axis of the air inlet and outlet (21) located at the bottom of the tank cover (2).

7. The tank mouth assembly of a helium storage tank according to claim 6, characterized in that: An extrusion block (542) is provided at the bottom end of the sealing gasket (54), the bottom end of the extrusion block (542) corresponds to the size of the top end of the upper shell (72), and the extrusion block (542) is configured as a wear-resistant part.

8. The tank mouth assembly of a helium storage tank according to claim 1, characterized in that: The outer surface of the valve stem (52) is provided with a mounting platform (521), the outer surface of the mounting platform (521) is sleeved with a sealing ring (8), and the sealing ring (8) is mounted on the top end of the connecting ring (63) through a pressing plate (9) and a fastener.

9. The tank mouth assembly of a helium storage tank according to claim 1, characterized in that: A plurality of semicircular protrusions (541) are arranged on the top side of the outer surface of the sealing gasket (54), and the outer diameter of the semicircular protrusions (541) is greater than the outer diameter of the sealing gasket (54).

10. The tank mouth assembly of a helium storage tank according to claim 9, characterized in that: The semicircular protrusion (541) is arranged at a certain angle along the horizontal direction.

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