Radial flow cold trap

Abstract

The present disclosure provides a radial flow cold trap, which includes a housing, a heat exchange assembly, a flow splitting manifold group, a flow collecting manifold group and a gas collecting pipe. The housing has an open end, and a first end plate and a second end plate are oppositely arranged inside it. The central connection line of the first end plate and the second end plate forms a first central axis, and the first central axis is parallel or coincident with the central axis of the housing. The heat exchange assembly is arranged inside the housing. The heat exchange assembly includes multiple groups of heat exchange tube bundles connected in parallel. Each heat exchange tube bundle includes multiple heat exchange tubes connected in series, and the axes of the multiple heat exchange tubes are radially symmetrically arranged relative to the first central axis. The structure of this radial flow cold trap enables the air flow entering the housing to enter from the periphery of the space surrounded by the first end plate and the second end plate and flow in the radially inward direction. The condensable steam sublimates on the surface of the heat exchange tubes, and the non-condensable gas is collected in the gas collecting pipe and extracted, which can solve the technical problems of large occupied space, low utilization rate of heat exchange area, easy occurrence of ice blockage and large air flow resistance in the prior art.

Description

Technical Field

[0001] The present invention relates to a cold trap, and in particular to a radial flow cold trap. Background Art

[0002] A cold trap, also called a vapor trap, is a heat exchange device that uses a low-temperature surface to condense gases with relatively low saturated vapor pressures such as water vapor under a vacuum environment for trapping. Cold traps are widely used in vacuum freeze-drying devices, edible oil deodorization devices, fatty acid fractionation devices, and petrochemical industries.

[0003] The structural forms of cold traps mainly include coil types (including spiral coil types and serpentine coil types), shell-and-tube types, and plate types. Among them, shell-and-tube cold traps are widely used in medium and large-sized vapor trapping devices due to their low cost, easy processing, and convenient maintenance.

[0004] For the convenience of processing, the heat exchange tubes in a shell-and-tube cold trap are generally arranged at equal distances, and adjacent heat exchange tubes are arranged in an equilateral triangle or rectangular pattern, that is, every three adjacent heat exchange tubes in two rows are arranged in an equilateral triangle pattern or every four adjacent heat exchange tubes are arranged in a rectangular pattern. This arrangement has the following deficiencies:

[0005] (1) A large amount of ice forms on the surface at the gas flow inlet end of the cold trap, and ice blockage is likely to occur at the inlet end. To ensure a smooth gas flow channel, the tube pitch needs to be arranged according to the thickness of the ice layer at the inlet end. Therefore, the tube pitch is relatively large, resulting in a large occupied space and high cost of the cold trap.

[0006] (2) The gas flow at the inlet end of the cold trap contains a large amount of steam. As the steam is gradually trapped during the flow process, the steam content in the gas flow at the outlet end is very small. Taking the vacuum freeze-drying process as an example, the gas flow rate at the inlet end is usually hundreds of times that at the outlet end. Currently, the cross-sectional area of the gas flow channel of the cold trap is basically the same along the flow direction, resulting in a large resistance at the inlet end of the gas flow and a large waste of the flow channel space at the outlet end.

[0007] (3) The current cold trap structure has an optimal path that minimizes the flow resistance of the gas flow from the inlet end to the outlet end. This path is generally in the middle of the cold trap. The steam flow rate and the trapping amount are large near this path, and the trapping amount decreases with the increase of the distance from the periphery of this path, resulting in uneven heat exchange of the cold trap and low utilization rate of the heat exchange area. Summary of the Invention

[0008] In view of the above technical problems existing in the prior art, the present disclosure provides a radial flow cold trap. The structure of the radial flow cold trap is designed compactly, which can reduce the occupied space, and can solve the technical problems of low utilization rate of the heat exchange area, easy generation of ice blockage, and large gas flow resistance in the prior art.

[0009] An embodiment of the present disclosure provides a radial flow cold trap, including:

[0010] A housing having an open end and a central axis passing through the open end, and a first end plate and a second end plate are disposed oppositely inside the housing. The plate surfaces of the first end plate and the second end plate are perpendicular to the central axis of the housing. The line connecting the centers of the first end plate and the second end plate forms a first center line, and the first center line is parallel to or coincides with the central axis of the housing;

[0011] A heat exchange assembly disposed inside the housing. The heat exchange assembly includes multiple groups of heat exchange tube bundles. The heat exchange tube bundle includes multiple heat exchange tubes connected in series. The two ends of the heat exchange tube respectively pass through the first end plate and the second end plate. The axis of the heat exchange tube is parallel to the first center line, and the axes of multiple heat exchange tubes are radially symmetrically arranged with respect to the first center line. The heat exchange assembly is used to sublime the condensable gas inside the housing;

[0012] A flow dividing manifold group disposed inside the housing and connected to the inlet of the heat exchange assembly for supplying a heat exchange medium to the heat exchange tubes of the heat exchange assembly;

[0013] A collecting manifold group disposed inside the housing and connected to the outlet of the heat exchange assembly for discharging the heat exchange medium inside the heat exchange tubes of the heat exchange assembly;

[0014] A gas collecting pipe having its axis on the first center line. One end of the gas collecting pipe is disposed between the first end plate and the second end plate, and the other end passes through the second end plate and is connected to a vacuum pump. A plurality of air inlet holes are formed in the pipe wall of the gas collecting pipe, so that the non-condensable gas in the housing flows radially through the heat exchange assembly and is pumped to the gas collecting pipe through the air inlet holes and discharged by the vacuum pump.

[0015] In some embodiments, the number of the heat exchange tube bundles is 2M groups, where M is an integer between 6 and 32, and multiple groups of the heat exchange tube bundles are symmetrically arranged with respect to the first center line.

[0016] In some embodiments, multiple groups of the heat exchange tube bundles include two parts symmetrically arranged left and right along a vertical plane passing through the first center line, and each part includes M groups of heat exchange tube bundles.

[0017] In some embodiments, each group of the heat exchange tube bundles includes 2N heat exchange tubes, where N is an integer between 4 and 24. The 2N heat exchange tubes are divided into two parts symmetrically arranged up and down along a horizontal plane passing through the first center line, and each part includes N heat exchange tubes. These N heat exchange tubes are arranged radially outward with respect to the first center line. The ends of adjacent heat exchange tubes in each group of the heat exchange tube bundles are connected by elbows.

[0018] In some embodiments, the heat exchange tube is configured as a metal round tube, and adjacent heat exchange tubes are connected by elbows; or

[0019] The heat exchange tubes are configured as annular fin tubes or spiral fin tubes.

[0020] In some embodiments, the heat exchange tubes are configured as U-shaped tubes, and adjacent heat exchange tubes are connected through elbows.

[0021] In some embodiments, the housing includes a cylindrical body, the open end is located at the first end of the cylindrical body, the second end of the cylindrical body is connected to a head or a flange, and the axis of the cylindrical body is configured as the central axis of the housing.

[0022] In some embodiments, the first end plate and the second end plate are square plates, and through holes adapted to the heat exchange tubes are provided on the first end plate and the second end plate. Through holes adapted to the gas collecting pipe are also provided on the second end plate. The second end plate is farther from the open end than the first end plate.

[0023] In some embodiments, the flow dividing manifold group includes a manifold support member, a liquid inlet main pipe, a liquid distributor, and liquid distribution branches connected in sequence. The liquid distribution branches are connected to the inlets of the heat exchange assemblies, and a heat exchange medium inlet communicated with the liquid inlet main pipe is provided on the housing.

[0024] In some embodiments, the flow collecting manifold group includes flow collecting branches, a flow collecting header, and a flow collecting main pipe connected in sequence. The flow collecting branches are connected to the outlets of the heat exchange assemblies, and a heat exchange medium outlet communicated with the flow collecting main pipe is provided on the housing.

[0025] Compared with the prior art, the beneficial effects of the embodiments of the present disclosure are as follows: By providing heat exchange tubes with axes radially arranged relative to the first center line between two end plates and a gas collecting pipe with an axis coinciding with the first center line, and by evacuating non-condensable gases in the housing through a vacuum pump via the gas collecting pipe, the steam-containing gas flow in the radial flow cold trap flows roughly radially inward from the periphery of the space surrounded by the two end plates, and the steam-containing gas flow will not form an ice blockage on the inlet side of the heat exchange assembly; the flow path is short and there is no baffle, so the flow resistance is small; the heat exchange is uniform, there is no dead angle where the steam flow is not smooth in the heat exchange assembly, the heat exchange area is fully utilized, the gas trapping efficiency is high, and energy consumption can be saved. Moreover, the structure of the present application is designed compactly, the distance between adjacent heat exchange tubes in each group of heat exchange tube bundles can be very small, the radial flow cold trap occupies a small space, and the technical problems of low utilization rate of the heat exchange area, easy generation of ice blockage and large gas flow resistance in the prior art can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In the accompanying drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar components in different views. The same reference numerals with alphabetic suffixes or different alphabetic suffixes may represent different instances of similar components. The drawings generally illustrate various embodiments by way of example and not limitation, and are used in conjunction with the description and the claims to explain the disclosed embodiments. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be an exhaustive or exclusive embodiment of the apparatus or method.

[0027] Figure 1 FIG. is a cross-sectional view of a radial flow cold trap according to an embodiment of the present disclosure;

[0028] Figure 2 FIG. is a side view of a radial flow cold trap according to an embodiment of the present disclosure;

[0029] Figure 3 FIG. is an axonometric schematic diagram of a partial structure of a radial flow cold trap according to an embodiment of the present disclosure;

[0030] Figure 4 FIG. is a schematic structural diagram of a heat exchange assembly of a radial flow cold trap according to an embodiment of the present disclosure.

[0031] Components denoted by reference numerals in the figures:

[0032] 1 - housing; 11 - open end; 12 - first end plate; 13 - second end plate; 14 - heat exchange medium inlet; 15 - heat exchange medium outlet; 16 - head; 17 - support cross beam; 2 - heat exchange assembly; 21 - heat exchange tube; 22 - elbow; 3 - flow dividing manifold group; 31 - liquid inlet main pipe; 32 - liquid distributor; 33 - liquid distribution branch pipe; 34 - manifold support member; 4 - flow collecting manifold group; 41 - flow collecting main pipe; 42 - flow collecting header; 43 - flow collecting branch pipe; 5 - gas collecting pipe; 51 - gas inlet hole; 6 - heat exchange support member; 7 - housing support; 8 - reinforcing rib. Detailed Embodiments

[0033] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific examples, but this is not a limitation to the present disclosure.

[0034] As used in this disclosure, the terms "first", "second" and similar terms do not denote any order, quantity or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements before this term cover the elements listed after this term, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left" and "right" are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0035] In this disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0036] All terms used in this disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0037] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods and devices should be regarded as part of the specification.

[0038] Embodiments of this disclosure provide a radial flow cold trap, such as Figures 1 to 4As shown in the figure, the radial flow cold trap includes a housing 1, a heat exchange assembly 2, a flow dividing manifold group 3, a flow collecting manifold group 4, and a gas collecting pipe 5. The housing 1 has an open end 11 and a central axis passing through the open end 11. A first end plate 12 and a second end plate 13 are oppositely arranged inside the housing 1. The plate surfaces of the first end plate 12 and the second end plate 13 are perpendicular to the central axis. The connection line between the centers of the first end plate 12 and the second end plate 13 forms a first center line 1-1, and the first center line coincides with the central axis of the housing. The heat exchange assembly 2 is arranged inside the housing 1. The heat exchange assembly 2 includes multiple groups of heat exchange tube bundles. Each heat exchange tube bundle includes multiple heat exchange tubes 21 connected in series. The axes of the multiple heat exchange tubes 21 are parallel to the first center line, and both ends of the multiple heat exchange tubes 21 pass through the first end plate 12 and the second end plate 13 respectively. The heat exchange assembly 2 is used to sublime the condensable gas inside the housing 1. The flow dividing manifold group 3 is arranged inside the housing 1 and is connected to the inlet of the heat exchange assembly 2 for supplying heat exchange medium to the heat exchange tubes 21 of the heat exchange assembly 2. The flow collecting manifold group 4 is arranged inside the housing 1 and is connected to the outlet of the heat exchange assembly 2 for discharging the heat exchange medium inside the heat exchange tubes 21 of the heat exchange assembly 2. The gas collecting pipe 5 is arranged inside the housing 1 and its axis is on the first center line. A plurality of air inlet holes 51 are formed on the pipe wall of the gas collecting pipe 5. One end of the gas collecting pipe 5 is arranged between the first end plate and the second end plate, and the other end passes through the second end plate and is connected to a vacuum pump, so that the gas inside the housing 1 flows radially through the heat exchange assembly 2, and the non-condensable gas is pumped to the gas collecting pipe 5 through the air inlet holes 51 and discharged by the vacuum pump.

[0039] Specifically, Figure 1 The arrow direction shown in the figure is the gas flow direction. The above-mentioned housing 1 is hermetically connected to the chamber to be dried through its open end 11. The radial flow cold trap is used to capture condensable gas for the chamber to be dried. The vacuum pump connected to the radial flow cold trap is located at the exhaust port of the radial flow cold trap, and the above-mentioned chamber to be dried is located at the inlet port of the radial flow cold trap. And the above-mentioned housing 1 can be cylindrical. Reinforcing ribs 8 can be provided on the outer wall of the housing 1, and a housing support 7 can be provided at the bottom of the housing 1.

[0040] Specifically, a heat exchange support member 6 for supporting the heat exchange assembly 2 can be arranged inside the above-mentioned housing 1. Multiple groups of heat exchange tube bundles are arranged in parallel, and each group of heat exchange tube bundles is respectively connected to the flow dividing manifold group 3 and the flow collecting manifold group 4. The heat exchange medium enters the heat exchange assembly 2 through the flow dividing manifold group 3 and flows through the heat exchange assembly 2 to the flow collecting manifold group 4. Among them, the heat exchange medium can be, for example, ammonia, carbon dioxide or Freon refrigerant, or it can also be a low-temperature heat transfer fluid, such as ethylene glycol solution, calcium chloride solution or sodium chloride solution, etc.

[0041] After the heat exchange medium enters the heat exchange assembly 2, it flows through multiple heat exchange tubes 21 from outside to inside and then from inside to outside, absorbing the heat generated by the condensation of steam on the outer surface of the heat exchange tubes 21. The heat exchange medium heats up or evaporates, and the return liquid or return gas is collected in the collecting manifold group 4 and returned to the heat exchange medium heat exchange unit or refrigeration unit.

[0042] The gas collecting pipe 5 of the above-mentioned radial flow cold trap is connected to the vacuum pump through a pipeline. Under the suction action of the vacuum pump, the gas with a relatively high pressure and large steam content from the air inlet port of the shell 1 enters the air inlet channel surrounded by the first end plate 12 and the second end plate 13, and flows roughly inward in the radial direction to the middle of the radial flow cold trap with lower pressure. In this process, because the outer surface temperature of the heat exchange tube 21 is lower than the steam saturation temperature corresponding to the gas pressure, most of the steam condenses on the outer surface of the heat exchange tube 21, and the remaining small amount of steam and non-condensable gas gathers in the gas collecting pipe 5, is extracted by the vacuum pump and discharged into the atmosphere.

[0043] In some embodiments, the manifold 5 can be a circular tube with its axis coinciding with the first centerline. Multiple evenly spaced circular holes are formed around the periphery of the manifold 5. One end of the manifold 5 forms a closed air inlet located between the first end plate 12 and the second end plate 13. The other end passes through the second end plate 13 and is connected via a pipe to a vacuum pump located outside the radial flow cold trap. The manifold 5 collects non-condensable gases, which are then extracted by the vacuum pump and discharged into the atmosphere.

[0044] In some embodiments, as Figures 1 to 4 As shown, the number of the heat exchange tube bundles is 2M groups, M is an integer between 6 and 32, and the multiple groups of heat exchange tube bundles are symmetrically arranged relative to the first center line.

[0045] In some embodiments, as Figures 1 to 4 As shown, the multiple groups of heat exchange tube bundles include two parts arranged in a left-right symmetrical manner along a vertical plane passing through the first center line, and each part includes M groups of heat exchange tube bundles.

[0046] Specifically, Figure 3 There are 28 heat exchange tube bundles shown in the figure. The 28 heat exchange tube bundles are arranged in parallel and are arranged in two parts symmetrically with respect to the vertical plane passing through the first center line. Each part includes 14 heat exchange tube bundles.

[0047] In some embodiments, as Figures 1 to 4 As shown, each group of the heat exchange tube bundle includes 2N heat exchange tubes 21, where N is an integer between 4 and 24. The 2N heat exchange tubes 21 are divided into two parts that are symmetrically arranged up and down along a horizontal plane passing through the first center line. Each part includes N heat exchange tubes 21, and the N heat exchange tubes 21 are arranged radially outward relative to the first center line. The ends of adjacent heat exchange tubes 21 in each group of the heat exchange tube bundle are connected through elbows 22.

[0048] Specifically, each group of heat exchange tube bundles includes 28 heat exchange tubes 21, which are divided into two symmetrically arranged upper and lower parts with respect to the horizontal plane passing through the first center line, and each part includes 14 heat exchange tubes 21. The axes of the heat exchange tubes 21 are horizontally arranged, and the ends of adjacent heat exchange tubes 21 in each group of heat exchange tube bundles are connected by 180° elbows 22, so that the 28 heat exchange tubes 21 form a series structure.

[0049] Viewed along the direction parallel to the first center line, the flow direction of the heat exchange medium inside each group of heat exchange tube bundles is first from the outside to the inside along the radial direction, and then from the inside to the outside along the radial direction, and the included angle formed between the flow directions of the inlets or outlets of adjacent heat exchange tube bundles is equal. Specifically, in combination with Figure 4 , taking the group of heat exchange tube bundles closest to the horizontal plane passing through the first center line as the first group, and the adjacent group of heat exchange tube bundles as the second group, and so on. Figure 4 As shown in the figure, a total of 14 groups are shown. Then, viewed along the direction parallel to the first center line, the angle formed by the flow direction of the heat exchange medium inlet 14 and the flow direction of the heat exchange medium outlet 15 in the m-th group (m = 1 to 14) of heat exchange tube bundles is where m is the serial number of the heat exchange tube bundle group (m = 1 to M), and M is half of the number of heat exchange tube bundles. In some embodiments, as Figure 4 shown, M = 14.

[0050] In some embodiments, as Figure 3 shown, the heat exchange tube 21 is configured as a metal circular tube, and adjacent heat exchange tubes 21 are connected by elbows 22; or the heat exchange tube 21 is configured as an annular finned tube or a spiral finned tube.

[0051] In some embodiments, the heat exchange tube 21 is configured as a U-shaped tube, and adjacent heat exchange tubes 21 are connected by elbows 22.

[0052] In some embodiments, as Figure 1 and Figure 2 shown, the housing 1 includes a cylindrical body, the open end 11 is located at the first end of the cylindrical body, and the second end of the cylindrical body is connected with a head 16, and the axis of the cylindrical body is configured as the central axis of the housing.

[0053] In some embodiments, as Figures 1 to 3 shown, the first end plate 12 and the second end plate 13 are square plates, and through holes adapted to the heat exchange tubes 21 are opened on the first end plate 12 and the second end plate 13, and through holes adapted to the gas collecting pipe 5 are also opened on the second end plate 13, and the second end plate 13 is farther from the open end 11 than the first end plate 12.

[0054] Specifically, the first and second end plates 12, 13 are both square flat plates with folded edges on all sides. Multiple through-holes are formed in the plates, and the size and number of the through-holes match the size and number of the heat exchange tubes 21. A through-hole matching the size and number of the gas collecting pipe 5 is also formed in the center of the second end plate 13. A line connecting the centers of the first and second end plates 12, 13 forms a first centerline, which coincides with the central axis of the housing.

[0055] Specifically, the first end plate 12 and the second end plate 13 are arranged vertically and parallel to each other on either side of the heat exchange tube bundle, and the peripheries of the first end plate 12 and the second end plate 13 are connected by a plurality of supporting crossbeams 17. The first end plate 12 and the second end plate 13 support the heat exchange tubes 21, and the space enclosed by the first end plate 12 and the second end plate 13 forms an air inlet passage. Steam-containing gas from the air inlet port enters through the air inlet passage and flows inward generally in the radial direction of the shell 1.

[0056] The first end plate 12 and the second end plate 13 are square flat plates instead of circular flat plates in order to avoid the problem of the heat exchange tubes 21 being too dense near the middle of the heat exchange component 2 and thus being unable to be laid.

[0057] In some embodiments, as Figures 1 to 3 As shown, the diversion manifold group 3 includes a manifold support 34 and a liquid inlet main pipe 31, a liquid distributor 32 and a liquid distribution branch pipe 33 connected in sequence. The liquid distribution branch pipe 33 is connected to the inlet of the heat exchange component 2, and the shell 1 is provided with a heat exchange medium inlet 14 connected to the liquid inlet main pipe 31.

[0058] Specifically, one end of the liquid distributor 32 is connected to the liquid inlet manifold 31, and the other end is provided with several evenly distributed holes, each of which is connected to one end of a plurality of liquid distribution branches 33. The other ends of the distribution branches are connected to the inlets of the heat exchange tube bundles in a one-to-one correspondence. Manifold supports 34 secure the distribution manifold assembly 3 to the first end plate 12. The distribution manifold assembly 3 evenly distributes the heat exchange medium supply to each heat exchange tube bundle.

[0059] In some embodiments, as Figures 1 to 3 As shown, the collecting manifold group 4 includes a collecting branch pipe 43, a collecting junction box 42 and a collecting main pipe 41 connected in sequence. The collecting branch pipe 43 is connected to the outlet of the heat exchange component 2, and the shell 1 is provided with a heat exchange medium outlet 15 connected to the collecting main pipe 41.

[0060] Specifically, the center of a manifold 42 is connected to a manifold 41. Several holes are formed in the manifold 42, connecting to one end of multiple manifold branches 43. The other ends of these branches 43 are connected to the outlets of the multiple heat exchange tube bundles. The manifold 4 collects the return liquid or return gas of the heat exchange medium and returns it to the heat exchanger or refrigeration unit.

[0061] In the present disclosure, a heat exchange tube 21 whose length direction between the first end plate 12 and the second end plate 13 is radially arranged relative to the first center line and a gas collecting pipe 5 whose axis coincides with the first center line are provided, and non-condensable gas in the housing 1 is extracted through the gas collecting pipe 5 by means of a vacuum pump, so that the steam-containing gas flow flows substantially radially inwards from the periphery of the space enclosed by the two end plates in the radial flow cold trap, and the steam-containing gas flow will not form an ice blockage on the inlet side of the heat exchange assembly 2; the flow path is short and there is no baffle, so that the flow resistance is small; the gas flow is radially flowing, the cross-sectional areas and path lengths of the flow paths in different flow directions are not very different, the heat exchange is uniform, there is no dead angle in the heat exchange assembly where the steam flow is not smooth, the heat exchange area is fully utilized, the gas trapping efficiency is high, and energy consumption can be saved; and the structure of the present application is designed compactly, and the distance between adjacent heat exchange tubes 21 of each group of heat exchange tube bundles can be very small, making the radial flow cold trap structure compact and occupying a small space.

[0062] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments having equivalent elements, modifications, omissions, combinations (e.g., schemes that cross various embodiments), adaptations or alterations based on the present disclosure. The elements in the claims will be broadly interpreted based on the language employed in the claims and are not limited to the examples described in the present specification or during the implementation of the present application, and the examples will be interpreted as non-exclusive. Thus, the present specification and examples are intended to be considered only as examples, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0063] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. For example, those of ordinary skill in the art can use other embodiments when reading the above description. Additionally, in the above detailed description, various features can be grouped together to simplify the present disclosure. This should not be construed as an intention that a feature of the disclosure that is not claimed is necessary for any claim. On the contrary, the subject matter of the present disclosure can be less than all the features of a particular disclosed embodiment. Thus, the following claims are incorporated herein as examples or embodiments into the detailed description, where each claim independently serves as a separate embodiment, and considering these embodiments, they can be combined with each other in various combinations or permutations. The scope of the present disclosure should be determined with reference to the appended claims and the full scope of the equivalents to which those claims are entitled.

[0064] The above embodiments are only exemplary embodiments of the present disclosure and are not used to limit the present disclosure. The protection scope of the present disclosure is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present disclosure, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present disclosure.

Claims

1. A radial flow cold trap, characterized in that, Comprising: A housing having an open end and a central axis passing through the open end, and a first end plate and a second end plate oppositely arranged in the housing. The plate surfaces of the first end plate and the second end plate are perpendicular to the central axis of the housing. The connection line between the centers of the first end plate and the second end plate forms a first center line, and the first center line is parallel to or coincides with the central axis of the housing; A heat exchange assembly disposed in the housing. The heat exchange assembly includes multiple groups of heat exchange tube bundles. Each heat exchange tube bundle includes a plurality of heat exchange tubes connected in series. The two ends of each heat exchange tube pass through the first end plate and the second end plate respectively. The axis of the heat exchange tube is parallel to the first center line, and the axes of the multiple heat exchange tubes are symmetrically arranged radially with respect to the first center line. The heat exchange assembly is used to sublime the condensable gas in the housing; A flow dividing manifold group disposed in the housing and connected to the inlet of the heat exchange assembly for supplying a heat exchange medium to the heat exchange tubes of the heat exchange assembly; A flow collecting manifold group disposed in the housing and connected to the outlet of the heat exchange assembly for discharging the heat exchange medium in the heat exchange tubes of the heat exchange assembly; A gas collecting pipe having its axis on the first center line. One end of the gas collecting pipe is disposed between the first end plate and the second end plate, and the other end passes through the second end plate and is connected to a vacuum pump. A plurality of air inlet holes are formed in the pipe wall of the gas collecting pipe, so that the gas in the housing flows radially through the heat exchange assembly, and the non-condensable gas is pumped to the gas collecting pipe through the air inlet holes and discharged by the vacuum pump; wherein, The number of the heat exchange tube bundles is 2M groups, where M is an integer between 6 and 32, and the multiple groups of heat exchange tube bundles are symmetrically arranged with respect to the first center line; The heat exchange tube is configured as a U-shaped tube, and adjacent heat exchange tubes are connected through elbows.

2. The radial flow cold trap according to claim 1, wherein The multiple groups of heat exchange tube bundles include two parts symmetrically arranged left and right along a vertical plane passing through the first center line, and each part includes M groups of heat exchange tube bundles.

3. The radial flow cold trap according to claim 1, characterized in that, Each group of heat exchange tube bundles includes 2N heat exchange tubes, where N is an integer between 4 and 24. The 2N heat exchange tubes are divided into two parts symmetrically arranged up and down along a horizontal plane passing through the first center line, and each part includes N heat exchange tubes. The N heat exchange tubes are arranged radially outward with respect to the first center line. The ends of adjacent heat exchange tubes in each group of heat exchange tube bundles are connected through elbows.

4. The radial flow cold trap according to claim 1, characterized in that, The heat exchange tube is configured as a metal circular tube, and adjacent heat exchange tubes are connected through elbows; or The heat exchange tube is configured as an annular finned tube or a spiral finned tube.

5. The radial flow cold trap according to claim 1, characterized in that, The housing includes a cylindrical body, the open end is located at the first end of the cylindrical body, the second end of the cylindrical body is connected to a head or a flange, and the axis of the cylindrical body is configured as the central axis of the housing.

6. The radial flow cold trap according to claim 1, characterized in that, The first end plate and the second end plate are square plates, and through holes adapted to the heat exchange tubes are formed in the first end plate and the second end plate. Through holes adapted to the gas collecting pipe are also formed in the second end plate. The second end plate is farther from the open end than the first end plate.

7. The radial flow cold trap according to claim 1, characterized in that, The flow splitting manifold group includes a manifold support member, a liquid inlet main pipe, a liquid distributor, and liquid distribution branch pipes that are connected in sequence. The liquid distribution branch pipes are connected to the inlets of the heat exchange components, and a heat exchange medium inlet communicating with the liquid inlet main pipe is provided on the housing.

8. The radial flow cold trap according to claim 1, wherein The flow collecting manifold group includes flow collecting branch pipes, a flow collecting header, and a flow collecting main pipe that are connected in sequence. The flow collecting branch pipes are connected to the outlets of the heat exchange components, and a heat exchange medium outlet communicating with the flow collecting main pipe is provided on the housing.

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