CN220288320U - Shell-and-tube heat exchanger - Google Patents
Shell-and-tube heat exchanger Download PDFInfo
- Publication number
- CN220288320U CN220288320U CN202321907068.9U CN202321907068U CN220288320U CN 220288320 U CN220288320 U CN 220288320U CN 202321907068 U CN202321907068 U CN 202321907068U CN 220288320 U CN220288320 U CN 220288320U
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- tube
- shell
- heat exchange
- adjusting rod
- plug
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- 239000012530 fluid Substances 0.000 claims abstract description 50
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 6
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model discloses a shell-and-tube heat exchanger, which comprises a shell, a heat exchange tube and a first plug assembly, wherein the first plug assembly comprises a first plug and a first adjusting rod, a first through hole is formed in a first end cover, the first adjusting rod is arranged in the first through hole in a penetrating mode, the inner end of the first adjusting rod is positioned in a tube side fluid inlet cavity, the outer end of the first adjusting rod is positioned at the outer side of the first end cover, the first adjusting rod can axially move along the first through hole, the first plug is arranged at the inner end of the first adjusting rod, and the first plug can block an inlet of the heat exchange tube along with the axial movement of the first adjusting rod or open the inlet of the heat exchange tube. When the heat exchange area of the shell-and-tube heat exchanger is regulated, the first end cover of the shell does not need to be disassembled, and only the first regulating rod is pushed and pulled on the outer side of the first end cover to realize the plugging or opening of the inlet of the heat exchange tube.
Description
Technical Field
The utility model relates to the field of heat exchangers, in particular to a shell-and-tube heat exchanger.
Background
The shell-and-tube heat exchanger includes a housing and a heat exchange tube disposed within the housing. Two fluids of cold and hot heat exchange are carried out, one fluid flows in the tube bundle and becomes tube side fluid; the other type flows outside the tube, called shell-side fluid. The heat exchange area of the shell-and-tube heat exchanger is determined by the number of heat exchange tubes participating in the heat exchange. If the heat exchange area is required to be increased, a larger amount of tube side fluid flows in the heat exchange tubes; if the heat exchange area is to be reduced, a smaller amount of tube side fluid is circulated within the heat exchange tubes.
In the prior art, if the heat exchange area of the shell-and-tube heat exchanger is to be adjusted, it is generally necessary to disassemble the end caps of the shell, and then mount plugs on the heat exchange tubes one by one to reduce the number of the heat exchange tubes participating in heat exchange, or disassemble the plugs on the heat exchange tubes one by one to increase the number of the heat exchange tubes participating in heat exchange. The mode requires larger workload and has lower efficiency.
Therefore, how to reduce the workload of adjusting the heat exchange area and improve the adjustment efficiency is a critical problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model aims to reduce the workload when adjusting the heat exchange area and improve the adjustment efficiency. In order to achieve the above purpose, the present utility model provides the following technical solutions:
the shell-and-tube heat exchanger comprises a shell and heat exchange tubes, and is characterized in that a first tube plate and a second tube plate are arranged in the shell, the first tube plate and a first end cover of the shell enclose a tube side fluid inlet cavity, the second tube plate and a second end cover of the shell enclose a tube side fluid outlet cavity, the first tube plate and the second tube plate enclose a heat exchange cavity, the heat exchange tubes are positioned in the heat exchange cavity, one ends of the heat exchange tubes penetrate through the first tube plate so that inlets of the heat exchange tubes are positioned in the tube side fluid inlet cavity, and the other ends of the heat exchange tubes penetrate through the second tube plate so that outlets of the heat exchange tubes are positioned in the tube side fluid outlet cavity;
the shell-and-tube heat exchanger further comprises a first plug assembly, the first plug assembly comprises a first plug and a first adjusting rod, a first through hole is formed in the first end cover, the first adjusting rod penetrates through the first through hole, the inner end of the first adjusting rod is located in the tube side fluid inlet cavity, the outer end of the first adjusting rod is located on the outer side of the first end cover, the first adjusting rod can axially move along the first through hole, the first plug is arranged at the inner end of the first adjusting rod, and the first plug can seal the inlet of the heat exchange tube or open the inlet of the heat exchange tube along with the axial movement of the first adjusting rod.
Preferably, the first plug is a rubber pad, and the first plug is at least used for plugging an inlet of one heat exchange tube.
Preferably, a first locking nut is in threaded fit with the first adjusting rod, the first locking nut is located on the outer side of the first end cover, and the first locking nut is used for locking the first adjusting rod on the first end cover.
Preferably, a first sealing ring is further arranged between the first locking nut and the first end cover, and the first sealing ring is used for sealing the first via hole.
Preferably, a plurality of first adjusting rods are arranged on the first end cover, and one first plug is arranged at each end of each first adjusting rod.
Preferably, the shell-and-tube heat exchanger further comprises a second plug assembly, the second plug assembly is symmetrically arranged with the first plug assembly, the second plug assembly comprises a second adjusting rod and a second plug, a second through hole is formed in the second end cover, the second adjusting rod is arranged in the second through hole in a penetrating mode, the inner end of the second adjusting rod is located in the tube side fluid outlet cavity, the outer end of the second adjusting rod is located on the outer side of the second end cover, the second adjusting rod can axially move along the second through hole, the second plug is arranged at the inner end of the second adjusting rod, and the second plug can seal the outlet of the heat exchange tube or open the outlet of the heat exchange tube along with the axial movement of the second adjusting rod.
Preferably, the second plug is a rubber pad.
Preferably, a second locking nut is in threaded fit with the second adjusting rod, the second locking nut is located on the outer side of the second end cover, and the second locking nut is used for locking the second adjusting rod on the second end cover.
Preferably, a second sealing ring is further arranged between the second locking nut and the second end cover.
Preferably, the liquid inlet of the tube side fluid inlet cavity is positioned at the left lower part of the shell, and the liquid outlet of the tube side fluid outlet cavity is positioned at the right upper part of the shell; the liquid inlet of the shell side fluid is positioned at the right lower part of the shell, and the liquid outlet of the shell side fluid is positioned at the left upper part of the shell.
From the technical scheme, the following can be seen: when the heat exchange area of the shell-and-tube heat exchanger is regulated, the first end cover of the shell does not need to be disassembled, and only the first regulating rod is pushed and pulled on the outer side of the first end cover so as to realize the plugging or opening of the inlet of the heat exchange tube.
In this embodiment, although the first end cap is not detached, whether to push or pull in place may be determined by touching the first plug with the inlet of the heat exchange tube or with the inner wall of the first end cap. And under the condition that the inlets of some heat exchange tubes are opened, the first plug is tightly attached to the inner wall of the first end cover, so that the first plug cannot influence the flow of the tube side fluid into the cavity, and the smoothness of the fluid flow is ensured.
Drawings
In order to more clearly illustrate the solution of the embodiments of the present utility model, the following description will briefly explain the drawings needed to be used in the embodiments, it being evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the overall structure of a shell-and-tube heat exchanger according to an embodiment of the present utility model;
fig. 2 is a cross-sectional view of a shell-and-tube heat exchanger provided in an embodiment of the present utility model;
FIG. 3 is a schematic view of a second end cap according to an embodiment of the present utility model;
FIG. 4 is a schematic view of a second end cap according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a first plug assembly according to an embodiment of the present utility model.
Wherein 1 is a shell, 11 is a first end cover, 12 is a second end cover, 13 is a liquid inlet, 14 is a liquid outlet, 15 is a tube side fluid inlet, 16 is a tube side fluid outlet, 17 is a first tube plate, 18 is a second tube plate, 2 is a first plug assembly, 3 is a second plug assembly, 21 is a first adjusting rod, 22 is a first plug, 23 is a first lock nut, 24 is a first sealing ring, 31 is a second adjusting rod, 32 is a second plug, 33 is a second lock nut, and 4 is a heat exchange tube.
Detailed Description
The utility model discloses a shell-and-tube heat exchanger, which is used for reducing the workload when adjusting the heat exchange area and improving the adjustment efficiency.
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
Please refer to fig. 1-5.
The utility model discloses a shell-and-tube heat exchanger, which comprises a shell 1 and a heat exchange tube 4. A first tube plate 17 and a second tube plate 18 are arranged in the shell 1, the first tube plate 17 and the first end cover 11 of the shell 1 enclose a tube side fluid inlet cavity 15, the second tube plate 18 and the second end cover 12 of the shell 1 enclose a tube side fluid outlet cavity 16, the first tube plate 17 and the second tube plate 18 enclose a heat exchange cavity, and the heat exchange tube 4 is positioned in the heat exchange cavity. One end of the heat exchange tube 4 penetrates through the first tube plate 17 so that an inlet of the heat exchange tube 4 is located in the tube side fluid inlet cavity 15, and the other end of the heat exchange tube 4 penetrates through the second tube plate 18 so that an outlet of the heat exchange tube 4 is located in the tube side fluid outlet cavity 16.
The shell-and-tube heat exchanger of the utility model further comprises a first plug assembly 2, the first plug assembly 2 comprising a first plug 22 and a first adjustment rod 21. The first end cover 11 of the shell 1 is provided with a first through hole, the first adjusting rod 21 is arranged in the first through hole in a penetrating mode, and the arrangement direction of the first adjusting rod 21 is consistent with that of the heat exchange tube 4. The inner end of the first adjusting rod 21 is located in the tube side fluid inlet chamber 15, and the outer end of the first adjusting rod 21 is located outside the first end cap 11, i.e., outside the housing 1. The first plug 22 is connected to the inner end of the first adjusting lever 21. The first adjusting rod 21 can move along the axial direction of the first through hole, and the first plug 22 can be close to the inlet of the heat exchange tube 4 along with the movement of the first adjusting rod 21 so as to block the inlet of the heat exchange tube 4, or can be far away from the inlet of the heat exchange tube 4 along with the movement of the first adjusting rod 21 so as to open the inlet of the heat exchange tube 4. If the first plugs 22 block the inlets of some heat exchange tubes 4, the number of the heat exchange tubes 4 participating in heat exchange is reduced, which is equivalent to reducing the heat exchange area; if the first plugs 22 open the inlets of some heat exchange tubes 4, the number of heat exchange tubes 4 participating in heat exchange is increased, which corresponds to an increase in heat exchange area.
When some heat exchange tubes 4 are plugged, the corresponding first adjusting rods 21 are pushed inwards until the first plugs 22 touch the inlets of the heat exchange tubes 4, and pushing of the first adjusting rods 21 is stopped, so that the fact that the first plugs 22 plug the inlets of the heat exchange tubes 4 is explained. When some heat exchange tubes 4 are opened, the corresponding first adjusting rods 21 are pulled outwards until the first plugs 22 touch the inner wall of the first end cover 11, and the pulling of the first adjusting rods 21 is stopped, at this time, the fact that the first plugs 22 have opened the outlets of the heat exchange tubes 4 is indicated, and the first plugs are closely attached to the inner wall of the first end cover 11. In the present embodiment, although the first end cap 11 is not detached, whether to push or pull in place may be determined by the contact of the first plug 22 with the inlet of the heat exchange tube 4 or with the inner wall of the first end cap 11. In addition, when the inlets of some heat exchange tubes 4 are opened, the first plugs 22 are closely attached to the inner wall of the first end cover 11, so that the first plugs 22 do not influence the flow of the tube side fluid into the cavity 15, and the smoothness of the fluid flow is ensured.
In this embodiment, when the heat exchange area of the shell-and-tube heat exchanger is adjusted, the first end cover 11 of the shell 1 does not need to be disassembled, and only the first adjusting rod 21 needs to be pushed and pulled on the outer side of the first end cover 11 to realize plugging or opening of the inlet of the heat exchange tube 4, in this embodiment, the setting of the first plug assembly 2 obviously reduces the workload when adjusting the heat exchange area, and improves the adjustment efficiency.
The first plug 22 may be a circular rubber pad, and when the inlet of the heat exchange tube 4 is plugged, a certain pushing force is applied to the first plug 22, so as to ensure that the first plug 22 tightly plugs the inlet of the heat exchange tube 4. The first plug 22 is at least for plugging the inlet of one heat exchange tube 4. That is, the first plug 22 may block the inlet of one heat exchange tube 4, or may block the inlets of two or more heat exchange tubes 4 at the same time, which is not particularly limited herein.
The first adjusting rod 21 is provided as a screw rod, namely, an external thread is arranged on the first adjusting rod 21, and the first locking nut 23 is in threaded fit on the first adjusting rod 21. The first lock nut 23 is located on the outside of the first end cap 11. When the heat exchange area needs to be adjusted, the first lock nut 23 is unscrewed, so that the first adjusting rod 21 can freely stretch and retract. After the first plug 22 seals the inlet of the heat exchange tube 4, the first lock nut 23 is screwed, so that the first adjusting rod 21 is fixed on the first end cover 11, and the first plug 22 can be ensured to be always in the sealing position. After the first plug 22 is attached to the inner wall of the first end cap 11, the first locking nut 23 is screwed, so that the first adjusting rod 21 is fixed to the first end cap 11, and it is ensured that the first plug 22 is always in the open position.
In order to form a seal against the first via, the present utility model provides a first O-ring 24 between the first lock nut 23 and the outer wall of the first end cap 11 to prevent liquid in the tube side fluid inlet chamber 15 from leaking outwardly through the first via.
In order to widen the adjustment range, the utility model provides a plurality of first adjusting rods 21 on the first end cover 11, wherein the end part of each first adjusting rod 21 is provided with a first plug 22, and each first plug 22 can at least plug the inlet of one heat exchange tube 4. By plugging different numbers of heat exchange tubes 4, a plurality of different heat exchange areas can be obtained.
For one heat exchange tube 4, if only its inlet is plugged, then in the tube side fluid outlet chamber 16, the liquid may flow back into the heat exchange tube 4 through the outlet of the heat exchange tube 4, thus reducing the accuracy of the heat exchange area. For this purpose, a second plug assembly 3 is provided, the second plug assembly 3 being similar in structure to the first plug assembly 2, and the second plug assembly 3 being arranged symmetrically or in alignment with the first plug assembly 2.
The second plug assembly 3 comprises a second adjusting rod 31 and a second plug 32, a second through hole is formed in the second end cover 12, the second adjusting rod 31 is arranged in the second through hole in a penetrating mode, the inner end of the second adjusting rod 31 is located in the tube side fluid outlet cavity 16, and the outer end of the second adjusting rod 31 is located on the outer side of the second end cover 12. The second adjusting rod 31 can axially move along the second through hole, the second plug 32 is arranged at the inner end of the second adjusting rod 31, and the second plug 32 can plug the outlet of the heat exchange tube 4 or open the outlet of the heat exchange tube 4 along with the axial movement of the second adjusting rod 31.
The second plug 32 is made of the same material as the first plug 22, and is a rubber pad. The second adjusting rod 31 is screwed with a second locking nut 33, and the second locking nut 33 is located outside the second end cover 12. The second lock nut 33 is used to lock the second adjustment rod 31 to the second end cap 12.
In order to prevent the liquid in the tube side fluid outlet chamber 16 from leaking out through the second through hole, the present utility model provides a second sealing ring between the second lock nut 33 and the second end cap 12. The second sealing ring may specifically be an O-ring.
The liquid inlet 13 of the tube side fluid inlet cavity 15 is arranged below the tube side fluid inlet cavity 15 and is close to the left side of the shell 1. The drain port 14 of the tube side fluid outlet chamber 16 is provided above the tube side fluid outlet chamber 16 and near the right side of the housing 1. The inlet of the shell side fluid is arranged at the right lower part of the shell 1, and the outlet of the shell side fluid is arranged at the left upper part of the shell 1. Thus, the shell side fluid and the tube side fluid form countercurrent heat exchange, and the heat exchange effect is improved.
The adjustment of the heat exchange area of the shell-and-tube heat exchanger in the utility model comprises the steps of adjusting the heat exchange area to be large and adjusting the heat exchange area to be small.
The heat exchange area is enlarged as follows: the first lock nuts 23 of some of the first plug assemblies 2 are unscrewed, then the first adjustment rods 21 are pulled outwards, the pulling is stopped after the first plugs 22 are sensed to touch the inner wall of the first end caps 11, and then the first lock nuts 23 are screwed. At the second end cap 12, the second lock nut 33 of the second cap assembly 3 corresponding to the first cap assembly 2 is unscrewed, then the second adjusting rod 31 is pulled outwards, when the second cap 32 touches the inner wall of the second end cap 12, the pulling is stopped, and then the second lock nut 33 is screwed. So that the corresponding heat exchange tube 4 participates in the heat exchange operation, and the heat exchange area of the shell-and-tube heat exchanger is increased.
The step of reducing the heat exchange area is as follows: the first locking nuts 23 of some of the first plug assemblies 2 are unscrewed, then the first adjusting rods 21 are pushed inwards, pushing is stopped after the first plugs 22 touch the inlets of the heat exchange tubes 4, and then the first locking nuts 23 are screwed. At the second end cap 12, the second lock nut 33 of the second plug assembly 3 corresponding to the first plug assembly 2 is unscrewed, then the second adjusting rod 31 is pushed inwards, pushing is stopped after the second plug 32 touches the outlet of the heat exchange tube 4, and then the second lock nut 33 is screwed. Therefore, the inlet and the outlet of the corresponding heat exchange tube 4 are plugged, so that the corresponding heat exchange tube 4 is withdrawn from the heat exchange operation, and the heat exchange area of the shell-and-tube heat exchanger is reduced.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A shell-and-tube heat exchanger comprising a shell (1) and a heat exchange tube (4), wherein a first tube plate (17) and a second tube plate (18) are arranged in the shell (1), the first tube plate (17) and a first end cover (11) of the shell (1) enclose a tube side fluid inlet cavity (15), the second tube plate (18) and a second end cover (12) of the shell (1) enclose a tube side fluid outlet cavity (16), the first tube plate (17) and the second tube plate (18) enclose a heat exchange cavity, the heat exchange tube (4) is positioned in the heat exchange cavity, one end of the heat exchange tube (4) penetrates through the first tube plate (17) so that an inlet of the heat exchange tube (4) is positioned in the tube side fluid inlet cavity (15), and the other end of the heat exchange tube (4) penetrates through the second tube plate (18) so that an outlet of the heat exchange tube (4) is positioned in the tube side fluid outlet cavity (16);
the shell-and-tube heat exchanger further comprises a first plug assembly (2), the first plug assembly (2) comprises a first plug (22) and a first adjusting rod (21), a first through hole is formed in the first end cover (11), the first adjusting rod (21) is arranged in the first through hole in a penetrating mode, the inner end of the first adjusting rod (21) is located in the tube side fluid inlet cavity (15), the outer end of the first adjusting rod (21) is located on the outer side of the first end cover (11), the first adjusting rod (21) can move axially along the first through hole, the first plug (22) is arranged at the inner end of the first adjusting rod (21), and the first plug (22) can seal the inlet of the heat exchange tube (4) or open the inlet of the heat exchange tube (4) along with the axial movement of the first adjusting rod (21).
2. Shell-and-tube heat exchanger according to claim 1, characterized in that the first plug (22) is a rubber pad, the first plug (22) being intended to plug at least the inlet of one of the heat exchanger tubes (4).
3. Shell-and-tube heat exchanger according to claim 1, characterized in that the first adjusting rod (21) is screw-fitted with a first lock nut (23), the first lock nut (23) being located outside the first end cap (11), the first lock nut (23) being used for locking the first adjusting rod (21) on the first end cap (11).
4. A shell and tube heat exchanger according to claim 3, characterized in that a first sealing ring (24) is further arranged between the first lock nut (23) and the first end cap (11), the first sealing ring (24) being adapted to seal the first via.
5. Shell-and-tube heat exchanger according to claim 1, characterized in that the first end cap (11) is provided with a plurality of first adjustment bars (21), one first plug (22) being provided at each end of the first adjustment bars (21).
6. Shell-and-tube heat exchanger according to claim 1, further comprising a second plug assembly (3), the second plug assembly (3) being symmetrically arranged with the first plug assembly (2), the second plug assembly (3) comprising a second adjusting rod (31) and a second plug (32), the second end cap (12) being provided with a second through hole, the second adjusting rod (31) being arranged in the second through hole in a penetrating way, the inner end of the second adjusting rod (31) being located in the tube side fluid outlet chamber (16), the outer end of the second adjusting rod (31) being located outside the second end cap (12), and the second adjusting rod (31) being axially movable along the second through hole, the second plug (32) being arranged at the inner end of the second adjusting rod (31), the second plug (32) being axially movable along with the second adjusting rod (31) to block the outlet of the heat exchange tube (4) or to open the outlet of the heat exchange tube (4).
7. The shell-and-tube heat exchanger according to claim 6, wherein the second plug (32) is a rubber pad.
8. Shell-and-tube heat exchanger according to claim 6, characterized in that the second adjusting rod (31) is screw-fitted with a second lock nut (33), the second lock nut (33) being located outside the second end cap (12), the second lock nut (33) being used for locking the second adjusting rod (31) to the second end cap (12).
9. Shell-and-tube heat exchanger according to claim 8, characterized in that a second sealing ring is also arranged between the second lock nut (33) and the second end cap (12).
10. Shell-and-tube heat exchanger according to claim 1, characterized in that the inlet (13) of the tube side fluid inlet (15) is located at the lower left of the housing (1) and the outlet (14) of the tube side fluid outlet (16) is located at the upper right of the housing; the liquid inlet of the shell-side fluid is positioned at the right lower part of the shell (1), and the liquid outlet of the shell-side fluid is positioned at the left upper part of the shell (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321907068.9U CN220288320U (en) | 2023-07-19 | 2023-07-19 | Shell-and-tube heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321907068.9U CN220288320U (en) | 2023-07-19 | 2023-07-19 | Shell-and-tube heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220288320U true CN220288320U (en) | 2024-01-02 |
Family
ID=89339326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321907068.9U Active CN220288320U (en) | 2023-07-19 | 2023-07-19 | Shell-and-tube heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220288320U (en) |
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2023
- 2023-07-19 CN CN202321907068.9U patent/CN220288320U/en active Active
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