CN220303800U - Heat exchange system and subway station comprising same - Google Patents
Heat exchange system and subway station comprising same Download PDFInfo
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- CN220303800U CN220303800U CN202321822942.9U CN202321822942U CN220303800U CN 220303800 U CN220303800 U CN 220303800U CN 202321822942 U CN202321822942 U CN 202321822942U CN 220303800 U CN220303800 U CN 220303800U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 99
- 239000002826 coolant Substances 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000012546 transfer Methods 0.000 abstract description 16
- 239000002689 soil Substances 0.000 abstract description 8
- 238000004378 air conditioning Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 241000589248 Legionella Species 0.000 description 1
- 208000007764 Legionnaires' Disease Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Landscapes
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The utility model discloses a heat exchange system and a subway station comprising the same, which belong to the field of urban rail transit engineering air conditioning systems. The subway station has used this heat transfer system, with first heat transfer module setting in envelope, through setting up first heat transfer module in continuous wall, bottom plate and roof for the contact surface of first heat transfer module and soil is great, improves heat transfer performance, and through the heat exchange tube of envelope effective protection pre-buried in envelope, can also make full use of concrete good thermal conductivity and heat capacity characteristic simultaneously, improves first heat transfer module's heat transfer ability and effect.
Description
Technical Field
The utility model belongs to the field of urban rail transit engineering air conditioning systems, and particularly relates to a heat exchange system and a subway station comprising the same.
Background
At present, a subway station refrigerating system is usually in a form of a water chilling unit and a ground cooling tower, and the cooling tower is required to be arranged on the ground. Along with the rapid development of rail transit, subway lines often need to pass through dense areas of urban central population, however, the areas are tense in land and difficult to move, and proper positions are difficult to find to arrange ground cooling towers, and meanwhile, the ground cooling towers are often complained by surrounding residents due to noise, floating water, legionella, influence on urban landscapes and the like.
The ground source heat pump system is used as an energy-saving and environment-friendly technology for providing cold and heat for the indoor space by utilizing renewable geothermal energy, and realizes heat transfer from low grade to high grade by inputting a small amount of high grade energy. The heat exchange performance and the arrangement mode of the buried pipe heat exchanger, which is used as an important device for extracting the soil cold and heat quantity of the ground source heat pump system, have great influence on the reliability and the applicability of the whole system. However, the conventional vertical buried pipe ground source heat pump needs a larger field for drilling and pipe burying construction, and meanwhile, the drilling cost is higher, the construction time is longer, and the conventional vertical buried pipe ground source heat pump is difficult to be used for a subway station heating, ventilation and air conditioning system.
The subway station is provided with a large number of underground building enclosures, the contact surface with soil is large, and the underground water seepage enhanced heat exchange level possibly exists at the soil layer position, so that the subway station has excellent conditions of heat exchange with the soil layer. Therefore, based on the ground source heat pump technology, the heat exchange pipe is combined with the enclosure structure, so that the heat exchange efficiency is improved, and meanwhile, the construction difficulty is greatly reduced.
Disclosure of Invention
In view of one or more of the above drawbacks or improvements of the prior art, the present utility model provides a heat exchange system and a subway station including the same, wherein the heat exchange system is disposed in the subway station, and the first heat exchange module is correspondingly disposed in the enclosure structure, so that the first heat exchange module performs a heat exchange operation with soil.
In order to achieve the above-mentioned purpose, the present utility model provides a heat exchange system and a subway station comprising the same, which comprises a plurality of first heat exchange modules, a medium transmission module and a second heat exchange module;
the first heat exchange modules comprise a plurality of U-shaped heat exchange tubes which are arranged in series, and the plurality of first heat exchange modules are arranged in parallel;
the medium transmission modules comprise circulating water pumps, medium outlets of the first heat exchange modules are connected with water inlets of the circulating water pumps, water outlets of the circulating water pumps are connected with medium inlets of the second heat exchange modules, and medium inlets of the first heat exchange modules are respectively connected with medium outlets of the second heat exchange modules, so that cooling medium circulates in the heat exchange system to form a circulating passage.
As a further improvement of the utility model, the medium transmission module further comprises a water separator and a water collector;
the water separator is arranged between the first heat exchange modules and the second heat exchange modules, one end of the water separator is connected with the medium inlet of each first heat exchange module, and the other end of the water separator is connected with the medium outlet of each second heat exchange module;
the water collector is arranged between each first heat exchange module and the circulating water pump, one end of the water collector is connected with the medium outlet of each first heat exchange module, and the other end of the water collector is connected with the water inlet of the circulating water pump.
As a further improvement of the utility model, the heat exchange system further comprises a constant pressure module, the constant pressure module comprises a constant pressure water tank and a medium supplementing pump, the connection position of the constant pressure water tank and the circulating passage is arranged close to the water inlet of the circulating water pump, and the medium supplementing pump is connected with the constant pressure water tank.
As a further improvement of the utility model, the constant pressure module further comprises a pressure sensor arranged at the water inlet of the circulating water pump.
As a further improvement of the utility model, an electronic water processor is arranged between the water collector and the circulating water pump.
As a further improvement of the utility model, each first heat exchange module is arranged in parallel with the same program.
The utility model also provides a subway station, which is characterized in that the heat exchange system is adopted, and each first heat exchange module is arranged in the enclosure structure of the subway station.
As a further improvement of the utility model, the enclosure structure comprises a top plate, a bottom plate and continuous walls respectively arranged at two sides;
the first heat exchange modules are at least one of the first heat exchange modules respectively.
As a further improvement of the utility model, the continuous wall comprises a plurality of steel reinforcement cages which are sequentially arranged along the longitudinal direction, the steel reinforcement cages extend along the depth direction, and the U-shaped heat exchange tubes are arranged inside the steel reinforcement cages.
As a further improvement of the utility model, the U-shaped heat exchange tubes in the top plate and/or the bottom plate are horizontally arranged, and the U-shaped heat exchange tubes are arranged in cushion layers of the top plate and/or the bottom plate.
The above-mentioned improved technical features can be combined with each other as long as they do not collide with each other.
In general, the above technical solutions conceived by the present utility model have the following beneficial effects compared with the prior art:
(1) The heat exchange system and the subway station comprising the same solve the problems of larger occupied space and higher construction cost of the traditional buried pipe heat exchanger by combining the underground building envelope of the subway station with the heat exchange buried pipe of the ground source heat pump, avoid adopting a cooling tower, and solve the problems of land use, noise, floating water, urban landscapes and the like caused by using the cooling tower.
(2) According to the heat exchange system and the subway station comprising the same, the heat exchange pipes are arranged in the enclosure structure, so that the heat exchange system of the buried pipe pre-buried in the enclosure structure can be effectively protected, the use reliability of the heat exchange system is improved, meanwhile, good thermal performance of concrete can be fully utilized, and the heat exchange capacity and effect of the buried pipe heat exchanger are improved.
(3) According to the heat exchange system and the subway station comprising the same, the corresponding U-shaped heat exchange tube structures are respectively arranged on the continuous walls, the top plate and the bottom plate at two sides of the station, and the heat accumulation phenomenon of the heat pump of the buried tube heat exchanger is improved by utilizing the characteristic of shallow burying of the station bottom plate enclosure structure in a shallow burying mode and the arrangement mode of combining the horizontal and vertical.
(4) The heat exchange system and the subway station comprising the same can fully utilize renewable natural resources through energy obtained by heat exchange with soil, are simple in construction and installation, are reliable in system operation, and have obvious energy-saving effect and environmental benefit.
Drawings
FIG. 1 is a schematic view of a portion of a heat exchange system in an embodiment of the present utility model;
FIG. 2 is a schematic view of a subway station according to an embodiment of the present utility model;
like reference numerals denote like technical features throughout the drawings, in particular: 1. a top plate; 2. a bottom plate; 3. a continuous wall; 4. a first heat exchange module; 5. a medium transmission module; 501. a circulating water pump; 502. a water separator; 503. a water collector; 6. a constant pressure module; 601. a constant pressure water tank; 602. a medium replenishment pump; 7. an electronic water treatment device.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
Examples:
the heat exchange system in the preferred embodiment of the utility model and the subway station comprising the same are shown in figures 1-2. The heat exchange system comprises a plurality of first heat exchange modules, medium transmission modules and second heat exchange modules, and a circulation pipeline is arranged between the first heat exchange modules and the second heat exchange modules, so that cooling medium can flow into the second heat exchange modules from the first heat exchange modules and then return to the first heat exchange modules from the second heat exchange modules.
Further, the first heat exchange modules 4 comprise a plurality of U-shaped heat exchange tubes which are arranged in series, and the first heat exchange modules 4 are arranged in parallel, so that the plurality of first heat exchange modules 4 can form a whole. Further preferably, the medium transmission module 5 includes a circulating water pump 501, a water outlet of the circulating water pump 501 is connected with a medium inlet of the second heat exchange module, and the medium inlets of the first heat exchange modules 4 are respectively connected with a medium outlet of the second heat exchange module, so that the cooling medium circulates in the heat exchange system to form a circulation path.
Further, the second heat exchange module comprises a first passage and a second passage, the first passage is a cooling medium circulation passage, the cooling medium circulation passage corresponds to a medium inlet and outlet of the second heat exchange module, the circulation passage of the whole cooling medium is a closed passage, and the second passage is an air passage for transmitting air of a subway station, so that the second heat exchange module exchanges heat with the air. Specifically, the cooling medium is cooled or heated after passing through the first heat exchange module 4, and after entering the second heat exchange module, the temperature of the air in the second passage is reduced or increased, so that the heat exchange operation is realized. Further preferably, the second heat exchange module is a unit heat exchanger comprising a condenser and/or an evaporator.
Further, the medium transmission module 5 preferably includes a water separator 502 and a water collector 503 to separate or collect each of the first heat exchange modules 4, where the water separator 502 is disposed between each of the first heat exchange modules 4 and the second heat exchange modules, one end of the water separator is connected to a medium inlet of each of the first heat exchange modules 4, and the other end of the water separator is connected to a medium outlet of the second heat exchange module, so as to distribute and reflux the cooling medium flowing out from a water outlet of the second heat exchange module into each of the first heat exchange modules 4, and a valve is disposed on a pipeline between each of the first heat exchange modules 4 and the water separator 502, so that the flow rate of the cooling medium return water entering each of the first heat exchange modules 4 is the same; the water collector 503 is disposed between the first heat exchange modules 4 and the circulating water pump 501, one end of the water collector is connected to the medium outlet of each first heat exchange module 4, and the other end is connected to the water inlet of the circulating water pump 501, so as to collect the cooling medium flowing out of each first heat exchange module 4 and convey the cooling medium to the second heat exchange module by the circulating water pump 501, thereby realizing heat exchange between the cooling medium and air. Further preferably, the first heat exchange modules 4 are connected with the water collector 503 and the water separator 502 through main pipes, and the lengths of pipelines between the main pipes are the same, so that the first heat exchange modules 4 are arranged in parallel in the same mode, and the flow distribution is balanced.
Further, a constant pressure module 6 is correspondingly arranged for the circulation path, so that the pressure of the whole cooling medium circulation path is always kept stable, the constant pressure module 6 comprises a constant pressure pipeline, the constant pressure pipeline is connected with the circulation path, and preferably, the connection position of the constant pressure pipeline and the circulation path is positioned between the circulating water pump 501 and the water collector 503. It is further preferred that one end of the constant pressure pipe is connected to the circulation path, and the other end thereof is connected to a medium source to supply the cooling medium.
Further, a constant pressure water tank 601 and a medium replenishing pump 602 are sequentially disposed on the constant pressure pipeline, the constant pressure water tank 601 is disposed near the circulation path, when the pressure in the circulation pipeline is too high, the cooling medium in the pipeline is extruded into the constant pressure water tank 601, so that the pressure in the pipeline is reduced to maintain stability, when the pressure in the pipeline is too low, the cooling medium in the constant pressure water tank 601 is introduced into the pipeline to maintain the pressure stability in the pipeline, and the medium replenishing pump 602 conveys the medium in the medium source into the constant pressure water tank 601 to maintain the pressure stability in the constant pressure water tank 601. Further preferably, a pressure sensor is arranged at the water inlet of the circulating water pump 501, the pressure change of the whole pipeline is determined by detecting the pressure at the water inlet, and when the pressure is low or water is leaked, the medium can be supplemented into the pipeline through the medium supplementing pump 602, so that the pressure stability of the whole pipeline is realized.
Further, the circulating medium in the pipeline is water generally, and the electronic water treatment device 7 is correspondingly arranged, and the electronic water treatment device 7 is used for treating cooling water in the pipeline to realize the functions of scale prevention, scale removal, sterilization, corrosion prevention and the like.
Furthermore, the utility model also provides a subway station which adopts the set of heat exchange system, the subway station is provided with the first heat exchange modules 4 in the enclosure structure, and the second heat exchange modules and the constant pressure module 6 are arranged in a machine room of the subway station, wherein the second passages in the second heat exchange modules are communicated with the air conditioning system, so that the air temperature in the station is regulated.
Further, the enclosure structure in the subway station comprises a top plate 1, a bottom plate 2 and underground continuous walls 3 on two sides, and in the actual setting process, at least one first heat exchange module 4 is respectively arranged on the four parts of the enclosure structure.
Taking the arrangement mode of the first heat exchange module 4 in the continuous wall 3 as an example, a plurality of reinforcement cages are sequentially arranged in the longitudinal direction of the subway station, each reinforcement cage extends along the depth direction, U-shaped heat exchange pipes are arranged in the reinforcement cages, and are connected in series to form the first heat exchange module 4, wherein the U-shaped heat exchange pipes in the part of the enclosure structure can be connected in series to form a whole, namely, a heat exchange module is formed, the heat exchange modules can also be correspondingly connected in series in a grouping way to form a plurality of first heat exchange modules 4, after the installation of the U-shaped heat exchange pipes is completed, concrete is poured to form the continuous wall 3 structure, so that the synchronous construction of the enclosure structure and the coupling buried pipes is completed, and the construction efficiency is greatly improved.
Further, the first heat exchange module 4 is installed on the enclosure structures of the top plate 1 and the bottom plate 2, wherein the U-shaped heat exchange pipes in the first heat exchange module 4 are horizontally arranged, and the U-shaped heat exchange pipes located on the top plate 1 and the bottom plate 2 are arranged in the cushion structures of the top plate 1 and the bottom plate 2.
Further, corresponding pore channels are reserved on the enclosure structure for installing the water supply and return main pipes, and the water supply and return main pipes are arranged in the same-program mode to connect the first heat exchange modules 4 in parallel, so that the water quantity of the cooling water supply and return water in different parallel units (namely, the first heat exchange modules) is evenly distributed.
According to the heat exchange system and the subway station comprising the same, the medium is transmitted to the first heat exchange module to exchange heat, and after the heat absorption or heat release heat exchange operation is completed, the medium is transmitted to the second heat exchange module, so that the gas in the second heat exchange module is subjected to the heat absorption or heat release heat exchange operation, and the gas temperature is adjusted. Further, this application sets up this heat transfer system in subway station to correspond and set up first heat transfer module in envelope, through setting up first heat transfer module in continuous wall, bottom plate and roof, make the contact surface of first heat transfer module and soil great, improve heat transfer performance, and effectively protect the heat transfer pipe pre-buried in envelope through envelope, improve its durability and reliability, simultaneously can also make full use of concrete good thermal conductivity and heat capacity characteristic, improve first heat transfer module's heat transfer ability and effect.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. The heat exchange system is characterized by comprising a plurality of first heat exchange modules, a medium transmission module and a second heat exchange module;
the first heat exchange modules comprise a plurality of U-shaped heat exchange tubes which are arranged in series, and the plurality of first heat exchange modules are arranged in parallel;
the medium transmission modules comprise circulating water pumps, medium outlets of the first heat exchange modules are connected with water inlets of the circulating water pumps, water outlets of the circulating water pumps are connected with medium inlets of the second heat exchange modules, and medium inlets of the first heat exchange modules are respectively connected with medium outlets of the second heat exchange modules, so that cooling medium circulates in the heat exchange system to form a circulating passage.
2. The heat exchange system of claim 1, wherein the media transport module further comprises a water diverter and a water collector;
the water separator is arranged between the first heat exchange modules and the second heat exchange modules, one end of the water separator is connected with the medium inlet of each first heat exchange module, and the other end of the water separator is connected with the medium outlet of each second heat exchange module;
the water collector is arranged between each first heat exchange module and the circulating water pump, one end of the water collector is connected with the medium outlet of each first heat exchange module, and the other end of the water collector is connected with the water inlet of the circulating water pump.
3. The heat exchange system according to claim 1 or 2, wherein the heat exchange system further comprises a constant pressure module, the constant pressure module comprises a constant pressure water tank and a medium supplementing pump, the connection position of the constant pressure water tank and the circulation path is arranged near the water inlet of the circulation water pump, and the medium supplementing pump is connected with the constant pressure water tank.
4. The heat exchange system of claim 3 wherein the constant pressure module further comprises a pressure sensor disposed at the water inlet of the circulating water pump.
5. The heat exchange system of claim 2, wherein an electronic water processor is disposed between the water collector and the circulating water pump.
6. The heat exchange system according to claim 1 or 2, wherein each of the first heat exchange modules is arranged in parallel with a program.
7. A subway station, wherein the heat exchange system according to any one of claims 1 to 6 is adopted, and each first heat exchange module is arranged in an enclosure structure of the subway station.
8. The subway station of claim 7, wherein the enclosure comprises a top plate, a bottom plate and continuous walls arranged on two sides;
the first heat exchange modules are at least one of the first heat exchange modules respectively.
9. The subway station of claim 8, wherein the continuous wall comprises a plurality of reinforcement cages arranged in sequence in a longitudinal direction, the reinforcement cages extending in a depth direction, the U-shaped heat exchange tubes being provided inside the reinforcement cages.
10. The subway station according to claim 8 or 9, wherein the U-shaped heat exchange tubes in the top plate and/or the bottom plate are placed horizontally, the U-shaped heat exchange tubes being arranged in cushions of the top plate and/or the bottom plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321822942.9U CN220303800U (en) | 2023-07-11 | 2023-07-11 | Heat exchange system and subway station comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321822942.9U CN220303800U (en) | 2023-07-11 | 2023-07-11 | Heat exchange system and subway station comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220303800U true CN220303800U (en) | 2024-01-05 |
Family
ID=89371608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321822942.9U Active CN220303800U (en) | 2023-07-11 | 2023-07-11 | Heat exchange system and subway station comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220303800U (en) |
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2023
- 2023-07-11 CN CN202321822942.9U patent/CN220303800U/en active Active
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