CN218665425U - Vacuum nitrogen making machine and cold box thereof - Google Patents

Abstract

The application provides a vacuum nitrogen generator cold box and vacuum nitrogen generator, relates to nitrogen generator field. Both the heat exchanger and the nitrogen tower are arranged inside the shell, the heat exchanger is fixed on the inner wall of the shell through a support, one end of the connecting mechanism is connected with the heat exchanger, the other end of the connecting mechanism is connected with the nitrogen tower, and the nitrogen tower is suspended relative to the inner wall of the shell. The heat exchanger and the nitrogen tower are fixed on the inner wall of the shell through one fixed end, and compared with the case that the heat exchanger and the nitrogen tower are respectively fixed on the inner wall of the shell through supports, one support is omitted, the contact area between the heat exchanger and the shell and the contact area between the nitrogen tower and the shell are reduced, and the cold leakage loss of a cold box of the nitrogen making machine is reduced; the heat exchanger and the nitrogen tower form a whole through the junctor, need not to consider that nitrogen tower and heat exchanger respectively pass through the support and fix when shells inner wall, and nitrogen tower and heat exchanger respectively have a stiff end, can contract and arouse the influence that the distance increased between nitrogen tower and the heat exchanger caused to respective stiff end during the shrinkage respectively, have reduced connecting line length, have reduced manufacturing cost.

Description

Vacuum nitrogen making machine and cold box thereof

Technical Field

The application relates to the field of nitrogen making equipment, in particular to a vacuum nitrogen making machine and a cold box thereof.

Background

With the rapid development of the industry, nitrogen is widely applied in the industrial field, the demand of nitrogen is greatly increased, and nitrogen used in the industry can be generally prepared by nitrogen preparation equipment.

Adopt the deep cooling method to prepare high-purity nitrogen's vacuum nitrogen making equipment generally includes nitrogen making machine cold box, nitrogen making machine cold box generally includes the casing, the heat exchanger, the nitrogen column (the nitrogen column is a rectifying column (the rectifying column is a tower gas-liquid contact device who carries out the rectification), can be used for nitrogen gas in the separation air) and connecting line, the casing is cylindric steel container, heat exchanger and nitrogen column all set up the inside at the casing, heat exchanger and nitrogen column pass through connecting line and connect, and heat exchanger and nitrogen column are fixed on the inner wall of casing through the support respectively, heat exchanger and nitrogen column have a stiff end respectively promptly. In the running process of the nitrogen making machine cold box, the cold energy of the heat exchanger and the nitrogen tower is respectively diffused to the outside of the shell through the support connected with the heat exchanger and the nitrogen tower, so that the cold leakage loss of the nitrogen making machine cold box is large.

In addition, in the process of nitrogen generator cold box operation, the shrinkage phenomenon can appear in heat exchanger and nitrogen tower, in order to adapt to the change of temperature, the both ends of heat exchanger can be towards the stiff end shrink of heat exchanger (be that the both ends of heat exchanger shrink towards the middle part of heat exchanger), the both ends of nitrogen tower can be towards the stiff end shrink of nitrogen tower (be that the both ends of nitrogen tower shrink towards the middle part of nitrogen tower), this makes the tip of heat exchanger towards the nitrogen tower (generally be the lower extreme of heat exchanger) and the tip of nitrogen tower towards the heat exchanger (generally be the upper end of nitrogen tower) between increase, in order to avoid connecting line fracture to appear, connecting line generally includes a plurality of departments of buckling, and connecting line's length is greater than the length between nitrogen tower and the heat exchanger, connecting line is flexible pipeline, this makes connecting line can stretch, in order to adapt to the increase of the length between nitrogen tower and the heat exchanger. However, the length of the connecting pipeline is long, and the cost for manufacturing the whole nitrogen generator cold box is high.

SUMMERY OF THE UTILITY MODEL

In view of this, the application provides a vacuum nitrogen generator cooler and vacuum nitrogen generator, the nitrogen tower passes through coupling mechanism to be fixed on the heat exchanger, the heat exchanger passes through the support to be fixed on the inner wall of casing, so, the fixing of heat exchanger and nitrogen tower both with the casing has been realized, the nitrogen tower is unsettled for the inner wall of casing, at this moment, only the heat exchanger passes through support and casing contact, the nitrogen tower can not contact with the lateral wall of casing, heat exchanger and nitrogen tower both fix on the inner wall of casing through a stiff end, compare with heat exchanger and nitrogen tower among the prior art are fixed on shells inner wall through the support respectively, a support has been reduced, so, the area of contact of heat exchanger and nitrogen tower both with the casing has been reduced, reduce the running cold loss of nitrogen generator cooler.

Meanwhile, one end of the connecting mechanism is connected with the heat exchanger, the other end of the connecting mechanism is connected with the nitrogen tower, the heat exchanger and the nitrogen tower form a whole, only the heat exchanger is connected with the inner wall of the shell, the end, far away from the heat exchanger, of the nitrogen tower is a free end, the end, facing the nitrogen tower, of the heat exchanger shrinks synchronously, the heat exchanger and the nitrogen tower form a whole through the connecting machine, when the nitrogen tower and the heat exchanger are fixed on the inner wall of the shell through the support respectively, the nitrogen tower and the heat exchanger respectively have a fixed end, the nitrogen tower and the heat exchanger shrink respectively towards the respective fixed end during cold shrinkage to cause the increase of the distance between the nitrogen tower and the heat exchanger, and therefore the length of the connecting pipeline is reduced, and the manufacturing cost of a cold box of a nitrogen making machine is reduced.

According to an aspect of this application, provide a vacuum nitrogen generator cold box, nitrogen generator cold box includes casing, heat exchanger, nitrogen tower, support and coupling mechanism, the heat exchanger with both set up in the nitrogen tower the inside of casing, the heat exchanger passes through the support is fixed in on the inner wall of casing, coupling mechanism's one end with the heat exchanger is connected, coupling mechanism's the other end with the nitrogen tower is connected, the nitrogen tower for the inner wall of casing is unsettled.

Preferably, the connection mechanism comprises a predetermined number of connections, of which each is connected to both the nitrogen column and the heat exchanger, the predetermined number of connections being equally spaced about the axis of the nitrogen column.

Preferably, the vacuum nitrogen generator cold box comprises a symmetry plane, and two parts of the predetermined number of the connectors, which are positioned on two sides of the symmetry plane, are symmetrical about the symmetry plane.

Preferably, the predetermined number is an even number greater than or equal to 4.

Preferably, the connecting piece includes first laminating portion, second laminating portion and connecting portion, first laminating portion with the orientation of heat exchanger the lateral part laminating of nitrogen tower, the second laminating portion with the orientation of nitrogen tower the lateral part laminating of heat exchanger, connecting portion connect first laminating portion with both of second laminating portion.

Preferably, the first attaching portion is a first plate, the second attaching portion is a second plate, the thickness of the first plate is equal to that of the shell of the heat exchanger, and the thickness of the second plate is equal to that of the shell of the nitrogen tower.

Preferably, the connecting mechanism comprises a connecting body, the connecting body comprises a first opening and a second opening, the heat exchanger is fixed on the inner wall of the connecting mechanism through the first opening, and the nitrogen tower is fixed on the inner wall of the connecting mechanism through the second opening.

Preferably, the heat exchanger and the nitrogen tower are arranged at intervals along the axial direction of the vacuum nitrogen making machine cold box;

coupling mechanism still includes joint portion, joint portion includes first joint piece and the second joint piece that connects each other, first joint piece is in the ascending size of axial direction is greater than the second joint piece is in the ascending size of axial direction, first joint piece with the nitrogen tower is connected, the second joint piece with the inner wall connection of jointing body.

Preferably, the vacuum nitrogen generator cold box further comprises a connecting pipeline, and the connecting pipeline is connected with the heat exchanger and the nitrogen tower.

According to another aspect of the application, a vacuum nitrogen generator is provided, and the vacuum nitrogen generator comprises the vacuum nitrogen generator cold box.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Figure 1 shows a cross-sectional view of a vacuum nitrogen generator cold box according to a first embodiment of the present invention, taken along a plane of symmetry;

FIG. 2 is a schematic structural view showing a connecting mechanism of a first embodiment of a cold box of a vacuum nitrogen generator;

FIG. 3 shows a top view of the attachment mechanism of the first embodiment of the vacuum nitrogen generator cold box;

figure 4 shows a cross-sectional view of a vacuum nitrogen generator cold box according to a second embodiment of the present invention taken along a plane of symmetry;

FIG. 5 is a schematic structural view showing a connecting mechanism of a second embodiment of a cold box of a vacuum nitrogen generator;

fig. 6 shows an enlarged view of a portion a in fig. 5.

Icon: 100-a housing; a 200-nitrogen column; 210-nitrogen column body; 220-sealing head; 300-a heat exchanger; 400-support; 500-a connection mechanism; 510-a connector; 511-a first bonding portion; 512-a second attachment; 513-a connecting portion; 520-a connecting body; 530-an engagement portion; 531-first splice member; 532-a second link; 540-welding seam.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent to those skilled in the art in view of the disclosure of the present application. For example, the order of operations described herein is merely an example, which is not limited to the order set forth herein, but rather, variations may be made in addition to operations which must occur in a particular order, which will be apparent upon understanding the disclosure of the present application. Moreover, descriptions of features known in the art may be omitted for clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after understanding the disclosure of the present application.

Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," coupled to, "over," or "overlying" another element, it may be directly "on," "connected to," coupled to, "over," or "overlying" the other element, or one or more other elements may be present therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," directly coupled to, "directly over" or "directly overlying" another element, there may be no intervening elements present.

As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more of the items.

Although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section referred to in the examples described herein may be termed a second element, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatial relationship terms such as "above 8230 \8230; above", "upper", "above 8230 \8230; below" and "lower" may be used herein to describe the relationship of one element to another element as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the terms "over 8230 \ 8230;" above "include both orientations" over 8230; \8230; "over 8230;" under 8230; "depending on the spatial orientation of the device. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

According to an aspect of the present application, there is provided a vacuum nitrogen generator cold box, as shown in fig. 1, the vacuum nitrogen generator cold box includes a shell 100, a heat exchanger 300, a nitrogen tower 200, a support 400 and a connecting mechanism 500, wherein both the heat exchanger 300 and the nitrogen tower 200 are disposed inside the shell 100, the heat exchanger 300 is fixed on an inner wall of the shell 100 through the support 400, the connecting mechanism 500 connects both the heat exchanger 300 and the nitrogen tower 200, and the nitrogen tower 200 is suspended with respect to the inner wall of the shell 100. This nitrogen tower 200 of vacuum nitrogen generator cold box passes through coupling mechanism 500 to be fixed on heat exchanger 300, heat exchanger 300 passes through support 400 to be fixed on the inner wall of casing 100, so, the fixing of heat exchanger 300 and nitrogen tower 200 with casing 100 has been realized, nitrogen tower 200 is unsettled for the inner wall of casing 100, at this moment, only heat exchanger 300 passes through support 400 and contacts with casing 100, nitrogen tower 200 can not contact with the lateral wall of casing 100, namely heat exchanger 300 and nitrogen tower 200 both fix on the inner wall of casing 100 through a stiff end, compare with prior art heat exchanger and nitrogen tower are fixed on the shells inner wall through the support respectively, a support has been reduced, so, the area of contact of heat exchanger 300 and nitrogen tower 200 with casing 100 has been reduced, reduce the running cold loss of nitrogen generator cold box.

Simultaneously, coupling mechanism 500's upper end is connected with heat exchanger 300, coupling mechanism's lower extreme is connected with nitrogen tower 200, heat exchanger 300 and nitrogen tower 200 form into a whole, this makes nitrogen tower 200's lower extreme be the free end, heat exchanger 300's lower extreme, coupling mechanism 500 and nitrogen tower 200 shrink in step, compared with the prior art, the vacuum nitrogen generator cold box of this application need not to consider that nitrogen tower and heat exchanger are respectively through the support when fixing at shells inner wall, nitrogen tower and heat exchanger respectively have a stiff end, nitrogen tower and heat exchanger can be respectively to respective stiff end shrink and arouse the influence that the distance between nitrogen tower and the heat exchanger increases and cause during the shrinkage, so, the length of connecting line has been reduced, the manufacturing cost of nitrogen generator cold box has been reduced.

In addition, the vacuum nitrogen making machine cold box is provided with one less support 400, the use of raw materials is reduced, and the cost of the vacuum nitrogen making machine cold box is reduced.

In the first embodiment of the present application, as shown in fig. 1, in a use state of the vacuum nitrogen generator cold box, the nitrogen tower 200 and the heat exchanger 300 are both arranged along a gravity direction, the heat exchanger 300 is disposed above the nitrogen tower 200, the upper end of the connecting structure is connected with the heat exchanger 300, and the lower end of the connecting mechanism 500 is connected with the nitrogen tower 200, so that the nitrogen tower 200 and the heat exchanger 300 are both connected as a whole, and then the whole of the nitrogen tower 200 and the heat exchanger 300 is fixed on the inner wall of the shell 100 through the support 400.

Further, as shown in fig. 3, the nitrogen column 200 has a cylindrical shape, and the connection mechanism 500 includes a predetermined number of connection pieces 510, each of the connection pieces 510 being connected to both the nitrogen column 200 and the heat exchanger 300 among the predetermined number of connection pieces 510, the predetermined number of connection pieces 510 being disposed at equal intervals around the axis of the nitrogen column 200.

Optionally, the number of connectors 510 is an even number greater than or equal to 4, for example, the number of connectors 510 may be 4, 6, 8, 10, or more.

Further, the vacuum nitrogen generator cold box includes a symmetry plane, which is a plane passing through the axis of the nitrogen column 200, and two portions of the predetermined number of the connection members 510 located at both sides of the symmetry plane are symmetrical with respect to the symmetry plane. In this way, a predetermined number of the connection members 510 are uniformly disposed between the nitrogen tower 200 and the heat exchanger 300, and thus, the uniformity of the stress of the nitrogen tower 200 can be ensured, thereby ensuring the stability of the installation of the nitrogen tower 200.

Taking the number of the connecting members 510 as 4 as an example, two connecting members 510 are located at one side of the symmetry plane, the other two connecting members 510 are located at the other side of the symmetry plane, and the two connecting members 510 located at one side of the symmetry plane are symmetrical to the two connecting members 510 located at the other side of the symmetry plane with respect to the symmetry plane.

As shown in fig. 2, the connecting member 510 includes a first attaching portion 511, a second attaching portion 512, and a connecting portion 513, the first attaching portion 511 is attached to a side portion of the heat exchanger 300 facing the nitrogen tower 200 (a lower side portion of the nitrogen tower 200), the second attaching portion 512 is attached to a side portion of the nitrogen tower 200 facing the heat exchanger 300 (an upper side portion of the nitrogen tower 200), and the connecting portion 513 connects the first attaching portion 511 and the second attaching portion 512, so that stability of connection between the connecting member 510 and the heat exchanger 300 and between the connecting member 510 and the nitrogen tower 200 can be ensured, and further, structural strength of the whole vacuum nitrogen generator cold box can be ensured.

Preferably, the first attaching portion 511 is a first plate, the second attaching portion 512 is a second plate, the first plate can be fixed on the heat exchanger 300 by welding, the second plate can be fixed on the nitrogen tower 200 by welding, the thickness of the first plate is equal to that of the shell of the heat exchanger 300, and the thickness of the second plate is equal to that of the shell of the nitrogen tower 200, so that the first plate and the second plate are arranged by adopting the principle of equal thickness, and the stability of welding between the first plate and the shell of the heat exchanger 300 and between the second plate and the shell of the nitrogen tower 200 can be ensured.

Preferably, the connection part 513 is a steel pipe. The steel pipe is high in strength and good in rigidity, can meet the requirement for connection between the nitrogen tower 200 and the heat exchanger 300, is convenient to obtain materials, is low in price, and further reduces the manufacturing cost of the cold box of the vacuum nitrogen making machine.

Further, the connecting portion 513 includes a first end face (an upper end face) and a second end face (a lower end face), the first attaching portion 511 includes a first attaching surface and a second attaching surface, the first attaching surface is attached to the heat exchanger 300, the second attaching surface is attached to the first end face, and an area of the first end face is smaller than an area of the second attaching surface. The second attaching portion 512 includes a third attaching surface and a fourth attaching surface, the third attaching surface is attached to the heat exchanger 300, the fourth attaching surface is attached to the second end surface, and the area of the second end surface is smaller than that of the fourth attaching surface. In this way, the connection stability between the connection portion 513 and the first bonding portion 511 and the connection portion 513 and the second bonding portion 512 can be ensured.

Further, nitrogen tower 200 includes nitrogen tower body 210 and head 220, and nitrogen tower body 210 is cylindricly, and the head 220 seals the tip of nitrogen tower body 210, and the quantity of head 220 can be two, and two head 220 are respectively towards the both ends protrusion of nitrogen tower 200, and head 220 includes the transition region, and the corner curvature in transition region is greater than the corner curvature in other regions, and the stress level is higher. The second fitting portion 512 may be fixed to the head 220 adjacent to the heat exchanger 300. The farthest ends of the connecting parts 513 of the nitrogen tower 200, which are far away from the axis of the nitrogen tower 200, are located on the same circle, and the diameter of the circle is less than or equal to 80% of the diameter of the nitrogen tower 200, so that the transition area of the seal head 220 can be avoided, and the risk of deformation of the seal head 220 in the using process is reduced.

Further, the nitrogen generator cold box should include a connecting line (not shown in fig. 1-6) that connects both the heat exchanger 300 and the nitrogen column 200.

Preferably, the holder 400 is an ear holder.

Optionally, the vacuum nitrogen generator cold box further comprises an external pipeline (not shown in fig. 1 to 6), and the nitrogen column 200 and the heat exchanger 300 can be respectively connected with the external structure of the vacuum nitrogen generator cold box through the external pipeline.

In the second embodiment of the present application, as shown in fig. 4 to 6, the connection mechanism 500 includes a connection body 520 including a first opening (upper opening) through which the heat exchanger 300 is fixed to the inner wall of the connection mechanism 500 and a second opening (lower opening) through which the nitrogen column 200 is fixed to the inner wall of the connection body 520, so that the connection of both the nitrogen column 200 and the heat exchanger 300 can also be achieved, and then the whole of both the nitrogen column 200 and the heat exchanger 300 is fixed to the inner wall of the casing 100 by the mount 400.

Further, heat exchanger 300 is the quadrangular prism form, and nitrogen tower 200 is cylindricly, and so, first opening is square opening, and the second opening is circular opening, and connecting body 520 sets up to the structure of "square on the earth" form, and heat exchanger 300 and nitrogen tower 200 are fixed in connecting body 520's inside, can guarantee nitrogen tower 200's fixed stability.

In addition, the heat exchanger 300 and the nitrogen column 200 are arranged at intervals along the axial direction of the vacuum nitrogen generator cold box, and the heat exchanger 300 is positioned above the nitrogen column 200 in a use state. The connection mechanism 500 further comprises a joint part 530, the joint part 530 comprises a first joint member 531 and a second joint member 532 which are connected with each other, the size of the first joint member 531 in the axial direction is larger than that of the second joint member 532 in the axial direction, the first joint member 531 is connected with the nitrogen tower 200, and the second joint member 532 is connected with the inner wall 520 of the connection body, namely, the joint part 530 is in a T shape. Optionally, the connection part 530 is made of T-shaped aluminum, and when the cold box of the vacuum nitrogen making machine is used, the T-shaped aluminum is under tension, the cross-sectional area bending-resistant section coefficient is large, and the bending resistance is good, and at this time, the end enclosure 220 does not receive force directly, so that the end enclosure 220 is better in stress condition, and the deformation of the end enclosure 220 can be avoided.

In the process of manufacturing the cold box of the vacuum nitrogen generator, the first connecting piece 531 may be welded on the nitrogen tower, then the second connecting piece 532 is beveled, and the connecting body 520 is inserted into the cut to be welded, so as to form the welding seam 540. Thus, the connection part 530 and the connection body 520 are welded, so that the connection part 530 and the connection body 520 are integrated, and the connection strength between the connection part 530 and the connection body 520 is ensured. The heat exchanger 300 may also be fixed to the inner sidewall of the connection body 520 by welding.

According to another aspect of the present application, a vacuum nitrogen generator is provided, which includes the above-mentioned vacuum nitrogen generator cold box, and has the same technical effects as the above-mentioned vacuum nitrogen generator cold box, which are not described herein again.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. The utility model provides a vacuum nitrogen generator cold box, its characterized in that, nitrogen generator cold box includes casing, heat exchanger, nitrogen tower, support and coupling mechanism, the heat exchanger with nitrogen tower both set up the inside of casing, the heat exchanger passes through the support is fixed in on the inner wall of casing, coupling mechanism's one end with the heat exchanger is connected, coupling mechanism's the other end with the nitrogen tower is connected, the nitrogen tower for the inner wall of casing is unsettled.

2. A vacuum nitrogen generator cold box according to claim 1, wherein said connection mechanism comprises a predetermined number of connections, each of said connections being connected to both said nitrogen column and said heat exchanger, said predetermined number of said connections being equally spaced about the axis of said nitrogen column.

3. A vacuum nitrogen generator cold box according to claim 2, characterized in that it comprises a plane of symmetry about which two portions of said predetermined number of said connections located on either side of said plane of symmetry are symmetrical.

4. The vacuum nitrogen generator cold box according to claim 2, wherein said predetermined number is an even number greater than or equal to 4.

5. The vacuum nitrogen generator cold box according to claim 2, wherein the connecting member comprises a first attaching portion attached to a side portion of the heat exchanger facing the nitrogen tower, a second attaching portion attached to a side portion of the nitrogen tower facing the heat exchanger, and a connecting portion connecting both the first attaching portion and the second attaching portion.

6. The vacuum nitrogen generator cold box as claimed in claim 5, wherein the first laminate is a first plate having a thickness equal to a thickness of a shell of the heat exchanger and the second laminate is a second plate having a thickness equal to a thickness of a shell of the nitrogen column.

7. The vacuum nitrogen generator cold box of claim 1, wherein the connection mechanism comprises a connection body, the connection body comprises a first opening and a second opening, the heat exchanger is fixed to the inner side wall of the connection mechanism through the first opening, and the nitrogen tower is fixed to the inner side wall of the connection mechanism through the second opening.

8. The vacuum nitrogen generator cold box according to claim 7, wherein the heat exchanger and the nitrogen column are both spaced apart along an axial direction of the vacuum nitrogen generator cold box;

the connecting mechanism further comprises a connecting portion, the connecting portion comprises a first connecting piece and a second connecting piece which are connected with each other, the size of the first connecting piece in the axial direction is larger than that of the second connecting piece in the axial direction, the first connecting piece is connected with the nitrogen tower, and the second connecting piece is connected with the inner side wall of the connecting body.

9. A nitrogen generator cold box according to any one of claims 1 to 8, further comprising a connecting line connecting both the heat exchanger and the nitrogen column.

10. A vacuum nitrogen generator, characterized in that it comprises a vacuum nitrogen generator cold box according to any one of claims 1-9.

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