Limiting and fixing device of vertical cold box

Abstract

The invention relates to the technical field of low-temperature refrigeration, in particular to a limiting and fixing device of a vertical cold box. The embodiment of the invention provides a limiting and fixing device of a vertical cold box. The limiting and fixing device comprises a threaded sleeve and a bolt. The threaded sleeve is fixed in a preset through hole of the vacuum shell and comprises a threaded part and a sealing part, the bolt comprises a limiting screw rod and a nut, the nut is sleeved with a sealing O-shaped ring, the threaded part is used for being in threaded connection with the limiting screw rod of the bolt, and the sealing O-shaped ring is used for being in threaded connection with the limiting screw rod of the bolt. The sealing part is used for being in sealing connection with a nut of the bolt through a sealing O ring; and during transportation, the bolts penetrate into the multiple screw sleeves arranged in the circumferential direction of the vacuum shell till the multiple limiting screw rods abut against the low-temperature equipment in the vacuum shell, and limiting and fixing are achieved. The embodiment of the invention provides a limiting and fixing device of a vertical cold box. The limiting and fixing device can accurately fix low-temperature equipment.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature refrigeration, and in particular to a position limiting and fixing device for a vertical cold box. Background Art

[0002] The vertical cold box includes a vacuum shell and cryogenic equipment hoisted inside the vacuum shell. During transportation, the acceleration change of the carrier will cause the hoisted cryogenic equipment to move, which may lead to instability or even damage to the cryogenic equipment.

[0003] In the related technology, bolt holes are reserved through the internal cryogenic equipment, and holes are reserved at the corresponding positions of the vacuum shell, and then connected by bolts. However, bolt connection has high requirements for concentricity and coaxiality, and in actual cold box production, internal equipment and pipelines are mostly welded, which makes it difficult to meet the requirements for matching accuracy.

[0004] Therefore, in view of the above problems, there is an urgent need for a limiting and fixing device for a vertical cold box that can accurately fix the low-temperature equipment. Summary of the invention

[0005] The embodiment of the present invention provides a position limiting and fixing device for a vertical cold box, which can accurately fix low-temperature equipment.

[0006] The embodiment of the present invention provides a position limiting and fixing device for a vertical cold box, comprising a threaded sleeve and a bolt;

[0007] The threaded sleeve is fixed in a through hole preset in the vacuum housing, the threaded sleeve includes a threaded portion and a sealing portion, the bolt includes a limiting screw and a nut, the nut sleeve is provided with a sealing O-ring, the threaded portion is used for threaded connection with the limiting screw of the bolt, and the sealing portion is used for sealing connection with the nut of the bolt through a sealing O-ring;

[0008] During transportation, the bolts are inserted into the plurality of threaded sleeves arranged along the circumference of the vacuum shell until the plurality of limiting screws abut against the cryogenic equipment inside the vacuum shell to achieve limiting fixation.

[0009] In a possible design, the limit screw and the nut are split structures, and the end of the limit screw used for connecting with the nut is provided with an axial groove, and is also provided with a radial through hole passing through the groove; the end of the nut used for connecting with the limit screw is provided with a boss matching the size of the groove, and the boss is provided with a through hole. After the boss is inserted into the groove, the connecting bolt passes through the through hole of the boss and the through hole of the limit screw to connect the limit screw and the nut.

[0010] In a possible design, a pressure relief screw is further included, and the pressure relief screw is used to replace the limit screw in a scenario where transportation is not required. The end of the pressure relief screw used to be connected to the nut is provided with an axial groove, and is also provided with a radial through hole passing through the groove. The end of the nut used to be connected to the pressure relief screw is provided with a boss matching the size of the groove, and the boss is provided with a through hole. After the boss is inserted into the groove, a connecting bolt passes through the through hole of the boss and the through hole of the pressure relief screw to connect the pressure relief screw and the nut;

[0011] The nut is provided with a pressure relief channel which penetrates the threaded portion along its axial direction, the length of the pressure relief screw is smaller than the length of the limiting screw, a limiting platform is provided at one end of the pressure relief screw away from its groove, the diameter of the limiting platform is larger than the inner diameter of the threaded portion, and the distance between the limiting platform and the sealing O-ring is larger than the axial length of the threaded sleeve.

[0012] In a possible design, the sealing portion includes a reducing curved surface whose diameter gradually decreases toward the threaded portion.

[0013] In a possible design, the inner wall of the sealing portion of the screw sleeve is conveniently rounded to prevent the sealing O-ring from being scratched.

[0014] In a possible design, the nut includes a first part and a second part, the first part is used to set a sealing O-ring to cooperate with the sealing part of the screw sleeve to achieve sealing, and the second part is used to cooperate with a tool to select the nut.

[0015] In a possible design, the second part includes an external hexagonal nut.

[0016] In a possible design, the second part includes a hexagon socket nut.

[0017] In a possible design, a sealing plate is connected to the end of the hexagonal nut, so that the vacuum shell is smooth as a whole without bumps and depressions.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In this embodiment, it is only necessary to weld the screw sleeves around the vacuum shell, screw the bolts into each screw sleeve, and make the screw rods of the bolts abut against the cryogenic equipment in multiple directions, and tighten them to prevent them from shaking during transportation. Since it is only necessary to weld the screw sleeves on the vacuum shell, it is not necessary to precisely dock the inserted bolts with the cryogenic equipment, but only to abut them. The whole device has a simple structure, is easy to operate, and has a stable effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic cross-sectional structure diagram of a position limiting and fixing device of a vertical cold box provided by an embodiment of the present invention;

[0022] Figure 2 It is a schematic cross-sectional structure diagram of a position limiting and fixing device connected to a pressure relief screw provided by an embodiment of the present invention;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of another limiting fixing device connected to a pressure relief screw provided by an embodiment of the present invention;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of another position limiting and fixing device connected to a pressure relief screw provided in an embodiment of the present invention.

[0025] In the figure:

[0026] 100-vacuum housing;

[0027] 200- cryogenic equipment;

[0028] 1-screw sleeve;

[0029] 11-pressure relief channel;

[0030] 21-nut;

[0031] 22-limiting screw;

[0032] 23-Sealing O-ring;

[0033] 24- boss;

[0034] 25-pressure relief screw;

[0035] 26-limiting platform;

[0036] 3-Connecting bolts. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present invention are described at the angles shown in the drawings and should not be understood as limiting the embodiments of the present invention. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0040] like Figure 1 As shown, an embodiment of the present invention provides a position limiting and fixing device for a vertical cold box, comprising a screw sleeve 1 and a bolt;

[0041] The screw sleeve 1 is fixed in a through hole preset in the vacuum housing 100. The screw sleeve 1 includes a threaded portion and a sealing portion. The bolt includes a limiting screw 22 and a nut 21. The nut 21 is sleeved with a sealing O-ring 23. The threaded portion is used for threaded connection with the limiting screw 22 of the bolt, and the sealing portion is used for sealing connection with the nut 21 of the bolt through the sealing O-ring 23.

[0042] During transportation, bolts are inserted into a plurality of threaded sleeves 1 arranged along the circumference of the vacuum shell 100 until a plurality of limiting screws 22 abut against the cryogenic equipment 200 inside the vacuum shell 100 to achieve limiting fixation.

[0043] In this embodiment, it is only necessary to weld the screw sleeves 1 around the vacuum shell 100, screw the bolts into each screw sleeve 1, and make the screw rods of the bolts abut against the cryogenic device 200 in multiple directions, and tighten it to prevent it from shaking during transportation. Since it is only necessary to weld the screw sleeves 1 on the vacuum shell 100, it is not necessary to accurately dock the inserted bolts with the cryogenic device 200, but only to abut them. The whole device has a simple structure, is easy to operate, and has a stable effect.

[0044] In some embodiments of the present invention, the limit screw 22 and the nut 21 are split structures, and the end of the limit screw 22 used for connecting with the nut 21 is provided with an axial groove, and is also provided with a radial through hole passing through the groove; the end of the nut 21 used for connecting with the limit screw 22 is provided with a boss 24 matching the size of the groove, and the boss 24 is provided with a through hole. After the boss 24 is inserted into the groove, the connecting bolt 3 passes through the through hole of the boss 24 and the through hole of the limit screw 22 to connect the limit screw 22 and the nut 21.

[0045] In this embodiment, the screw rod and the nut 21 are connected only by the boss 24 , and the cross-sectional area of ​​this part is small, which is beneficial to prevent the transfer of heat and can reduce the cooling loss of the cryogenic equipment 200 .

[0046] Please refer to Figure 2 and Figure 3 In some embodiments of the present invention, a pressure relief screw 25 is further included. The pressure relief screw 25 is used to replace the limit screw 22 in a scenario where transportation is not required. The end of the pressure relief screw 25 used to connect with the nut 21 is provided with an axial groove, and is also provided with a radial through hole passing through the groove. The end of the nut 21 used to connect with the pressure relief screw 25 is provided with a boss 24 matching the size of the groove, and the boss 24 is provided with a through hole. After the boss 24 is inserted into the groove, the connecting bolt 3 passes through the through hole of the boss 24 and the through hole of the pressure relief screw 25 to connect the pressure relief screw 25 and the nut 21;

[0047] The nut 21 is provided with a pressure relief channel 11 which penetrates the threaded portion along its axial direction. The length of the pressure relief screw 25 is smaller than the length of the limiting screw 22. A limiting platform 26 is provided at one end of the pressure relief screw 25 away from its groove. The diameter of the limiting platform 26 is larger than the inner diameter of the threaded portion. The distance between the limiting platform 26 and the sealing O-ring 23 is larger than the axial length of the screw sleeve 1.

[0048] After the transportation is completed, during the normal use of the cryogenic device 200, there is no need to use the limiting screw 22 to limit the cryogenic device 200. In addition, the limiting screw 22 abuts against the cryogenic device 200, which will cause a loss of cooling capacity. The length of the pressure relief screw 25 is less than the length of the limiting screw 22. Therefore, after installation, it will not contact the internal cryogenic device 200, thereby preventing the loss of cooling capacity caused by heat transfer. Furthermore, the pressure relief screw 25 cooperates with the nut 21 to have a safety pressure relief function. When the vacuum shell 100 and the cryogenic device 200 are in a normal vacuum state, the external air pressure squeezes the nut 21 inward, and the sealing O-ring 23 on the nut 21 seals the nut 21 and the sealing part. In an abnormal state, the vacuum shell 100 and the cryogenic device 200 are in a high-pressure abnormality, and the high-pressure gas pushes the nut 21 through the pressure relief channel 11 to make it pop outward, destroying the seal between the sealing O-ring 23 and the screw sleeve 1, so that the high-pressure gas is discharged to achieve pressure relief. The limit platform 26 at the end of the pressure relief screw 25 suppresses the pop-up nut 21 from popping out completely after it pops out, and it can be continuously used by vacuuming after the pressure relief.

[0049] In some embodiments of the present invention, the sealing portion includes a variable diameter curved surface whose diameter gradually decreases toward the threaded portion. With this arrangement, when the interior is vacuum, the external atmospheric pressure presses the nut 21 inwardly so that the sealing O-ring 23 thereon contacts the variable diameter curved surface more closely, and at the same time, when the interior is high pressure, it is easier to release pressure.

[0050] In some embodiments of the present invention, the inner wall of the sealing portion of the screw sleeve 1 is conveniently rounded to prevent the sealing O-ring 23 from being scratched.

[0051] In some embodiments of the present invention, the nut 21 includes a first part and a second part, the first part is used to set the sealing O-ring 23 to cooperate with the sealing part of the screw sleeve 1 to achieve sealing, and the second part is used to cooperate with the tool to select the nut 21.

[0052] like Figure 2 and Figure 3 As shown, in some embodiments of the present invention, the second portion includes an external hexagonal nut.

[0053] like Figure 4 As shown, in some embodiments of the present invention, the second portion includes a hexagonal nut.

[0054] In some embodiments of the present invention, a sealing plate is connected to the end of the hexagon socket nut, so that the vacuum housing 100 is smooth as a whole without bumps and depressions.

[0055] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A position limiting and fixing device for a vertical cold box, characterized in that: Including screw sleeves and bolts; The threaded sleeve is fixed in a through hole preset in the vacuum housing, the threaded sleeve includes a threaded portion and a sealing portion, the bolt includes a limiting screw and a nut, the nut sleeve is provided with a sealing O-ring, the threaded portion is used for threaded connection with the limiting screw of the bolt, and the sealing portion is used for sealing connection with the nut of the bolt through a sealing O-ring; During transportation, the bolts are inserted into the plurality of threaded sleeves arranged along the circumference of the vacuum shell until the plurality of limiting screws abut against the cryogenic equipment inside the vacuum shell to achieve limiting fixation.

2. The device according to claim 1, characterized in that The limit screw and the nut are split structures, and the end of the limit screw used for connecting with the nut is provided with an axial groove, and is also provided with a radial through hole passing through the groove; the end of the nut used for connecting with the limit screw is provided with a boss matching the size of the groove, and the boss is provided with a through hole. After the boss is inserted into the groove, the connecting bolt passes through the through hole of the boss and the through hole of the limit screw to connect the limit screw and the nut.

3. The device according to claim 2, characterized in that It also includes a pressure relief screw, which is used to replace the limit screw in a scenario where transportation is not required. The pressure relief screw is provided with an axial groove at one end connected to the nut, and is also provided with a radial through hole passing through the groove. The nut is provided with a boss matching the size of the groove at one end connected to the pressure relief screw, and the boss is provided with a through hole. After the boss is inserted into the groove, a connecting bolt passes through the through hole of the boss and the through hole of the pressure relief screw to connect the pressure relief screw and the nut; The nut is provided with a pressure relief channel which penetrates the threaded portion along its axial direction, the length of the pressure relief screw is smaller than the length of the limiting screw, a limiting platform is provided at one end of the pressure relief screw away from its groove, the diameter of the limiting platform is larger than the inner diameter of the threaded portion, and the distance between the limiting platform and the sealing O-ring is larger than the axial length of the threaded sleeve.

4. The device according to claim 3, characterized in that The sealing portion includes a reducing curved surface whose diameter gradually decreases toward the threaded portion.

5. The device according to claim 1, characterized in that The inner wall of the sealing portion of the screw sleeve is conveniently rounded to prevent the sealing O-ring from being scratched.

6. The device according to claim 1, characterized in that The nut includes a first part and a second part, the first part is used to set a sealing O-ring to cooperate with the sealing part of the screw sleeve to achieve sealing, and the second part is used to cooperate with a tool to select the nut.

7. The device according to claim 6, characterized in that The second portion includes an external hexagonal nut.

8. The device according to claim 6, characterized in that The second portion includes a hexagon socket nut.

9. The device according to claim 8, characterized in that The end of the hexagonal nut is connected with a sealing plate, so that the vacuum shell is smooth as a whole without bumps and depressions.

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