CN220852114U - System for recycling steam condensate - Google Patents
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- CN220852114U CN220852114U CN202322510954.4U CN202322510954U CN220852114U CN 220852114 U CN220852114 U CN 220852114U CN 202322510954 U CN202322510954 U CN 202322510954U CN 220852114 U CN220852114 U CN 220852114U
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- 238000004064 recycling Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 185
- 238000010612 desalination reaction Methods 0.000 claims abstract description 35
- 239000012498 ultrapure water Substances 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 238000009628 steelmaking Methods 0.000 description 9
- 238000001223 reverse osmosis Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
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- 238000013461 design Methods 0.000 description 2
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- 150000002500 ions Chemical class 0.000 description 2
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- 239000002184 metal Substances 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
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- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
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- 238000011221 initial treatment Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- 239000003643 water by type Substances 0.000 description 1
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The application provides a system for recycling steam condensate, comprising: a water reservoir for collecting and storing steam condensate; a first pump in communication with the reservoir; a boiler in communication with the first pump, the boiler configured to receive and vaporize at least a portion of the steam condensate; and the desalination water station mixing bed is communicated with the desalination water station transfer tank and is configured to remove impurities in the steam condensate so as to provide high-purity water, and the product water tank is communicated with the desalination water station mixing bed and is configured to receive and store the high-purity water. The system can effectively utilize the steam condensate and avoid the waste of the steam condensate.
Description
Technical Field
The application belongs to the technical field of steam condensate recovery, and particularly relates to a system for recycling steam condensate.
Background
In the steelmaking process, high-temperature steam needs to be introduced into the furnace, for example, the steam enters the furnace to be combined with normal-temperature protective gas through a steel rolling system vaporization furnace, and is condensed into water to be discharged. In addition, the steam generated by the waste heat boiler is transmitted to a steel post-waste heat power generation system, and a certain amount of condensed water is formed through a steam turbine. The steam condensate formed at present meets the discharge requirement and is directly discharged, so that certain waste is caused.
How to use the steam condensate obtained in the steelmaking process is an important direction to be considered.
Disclosure of utility model
The embodiment of the application provides a system for recycling steam condensate, which can effectively utilize the steam condensate and avoid waste of the steam condensate.
In one aspect, the present application provides a system for recycling steam condensate, comprising:
A water reservoir for collecting and storing steam condensate;
a first pump in communication with the reservoir;
A boiler in communication with the first pump, the boiler configured to receive and vaporize at least a portion of the steam condensate;
And the desalination water station mixing bed is communicated with the desalination water station transfer tank and is configured to remove impurities in the steam condensate so as to provide high-purity water, and the product water tank is communicated with the desalination water station mixing bed and is configured to receive and store the high-purity water.
In some embodiments, the water reservoir comprises a water level detector for detecting the amount of water of the steam condensate in the water reservoir.
In some embodiments, the system includes a first valve body disposed downstream of the first pump, the first pump in communication with the boiler and the desalinated water unit through the first valve body, respectively.
In some embodiments, the system includes a controller in communication with the first valve body and the water level detector, respectively, the controller controlling opening and closing of the first valve body based on the amount of water detected by the water level detector.
In some embodiments, the system includes a second valve body disposed between the first valve body and the boiler, the second valve body configured to control on-off between the first valve body and the boiler.
In some embodiments, the system includes a third valve body disposed between the first valve body and the desalinated water unit, the third valve body configured to control the on-off between the first valve body and the desalinated water unit.
In some embodiments, the product water basin includes a holding tank connected to the desalination water station mixed bed and configured to receive and store high purity water, and a water quality detection system disposed in the holding tank, the detection system configured to detect a water quality parameter of the high purity water, the water quality parameter including at least one of conductivity, calcium ion concentration, and magnesium ion concentration.
In some embodiments, the desalinated water unit further comprises a return branch connected between the product tank and the desalinated water station mixing bed, the return branch being provided with a second pump configured to be turned on when the water quality parameter exceeds a preset threshold value to return high purity water from the product tank to the desalinated water station mixing bed.
In some embodiments, the length of the line between the outlet of the first pump and the transfer tank in the desalination water station is 300 meters to 400 meters.
In some embodiments, the desalinated water unit includes a booster pump, the booster pump being connected to the product reservoir.
The application has at least the following beneficial effects:
According to the device provided by the embodiment of the application, through the arrangement of the water accumulator, the first pump, the boiler and the desalted water unit, redundant steam condensate can be reasonably utilized, and waste is reduced. And the steam condensate water has stable and better water quality, is beneficial to reducing the operation of the reverse osmosis system, and saves the operation electricity consumption, the medicament increase, the reverse osmosis membrane replacement and other expenses of the water making system. And recovering the surplus condensed water as the water replenishing of the desalted water unit, and relieving the water pressure of the desalted water unit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a system for recycling steam condensate according to an embodiment of the present application.
Reference numerals in the specific embodiments are as follows:
100. a water reservoir;
200. A first pump;
300. A controller;
400. A first valve body;
500. A second valve body;
600. A boiler;
700. A third valve body;
800. a desalted water unit; 810. a transfer pond of a desalination water station; 820. a desalination water station mixed bed; 830. a product pool; 840. a second pump; 850. and a pressurizing pump.
Detailed Description
Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the application only and not limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, 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 … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the patent.
It should also be noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
A certain amount of steam condensate is produced during the steelmaking process. Meanwhile, steam generated by a gasification furnace and a waste heat boiler of the steel rolling system is transmitted to a post-steel waste heat power generation system, partial recycling of condensate water after work is done by a steam turbine is realized, a certain margin is still present, the margin can reach 60-100 m 3/h, and in order to ensure safe and stable operation of a post-steel waste heat power generation unit, only the margin condensate water can be discharged into a trench through a drain box overflow pipe, so that the condensate water is discharged outwards, and waste is caused.
The research and analysis show that the steam condensate water has stable and good quality, and if the partial steam condensate water can be utilized, the waste can be reduced to a certain extent.
In view of the above, the application provides a system for recycling steam condensate, which is beneficial to reducing the operation of a reverse osmosis system, saving the operation power consumption of a water making system, reducing the use of medicaments, reducing the replacement cost of a reverse osmosis membrane and the like.
System for recycling steam condensate
Referring to fig. 1, an embodiment of the present application provides a system for recycling steam condensate, comprising:
In one aspect, the present application provides an apparatus for recycling steam condensate, comprising:
A water reservoir 100 for collecting and storing steam condensate;
a first pump 200 in communication with the water reservoir 100;
a boiler 600 in communication with the first pump 200, the boiler 600 configured to receive and vaporize at least a portion of the steam condensate;
The desalination water unit 800 communicates with the first pump 200, the desalination water unit 800 includes a desalination water station transit tank 810, a desalination water station mixed bed 820, and a product water tank 830, the desalination water station transit tank 810 communicates with the water reservoir 100 and is configured to store at least part of the steam condensate, the desalination water station mixed bed 820 communicates with the desalination water station transit tank 810 and is configured to remove impurities in the steam condensate to provide high purity water, and the product water tank 830 communicates with the desalination water station mixed bed 820 and is configured to receive and store the high purity water.
According to an embodiment of the present application, the water reservoir 100 may be a drain tank for a post-steel cogeneration system. The main function of the steel after-heat power generation system is to convert the waste heat energy generated in the steel production process into useful energy, improve the energy utilization efficiency, reduce the production cost, reduce the environmental impact and increase the power supply.
During steelmaking, a large amount of cooling water is required to cool the high temperature steel, equipment and process. Such cooling water often contains salts, oxides and other impurities that, if left untreated, can adversely affect equipment and processes. The wastewater produced in the steelmaking process typically contains various contaminants including precipitates, metal ions, acidic or basic materials, and the like. Desalination water stations are used to treat such wastewater to an industrial setting that meets emission standards or reuse standards of environmental regulations. Thus the desalted water unit has two important functions of maintaining the cooling water circulation and treating the wastewater. Notably, the desalination water station is also responsible for providing cooling water during steelmaking, requiring the preparation of a certain amount of soft water. And the steam condensate may be used as make-up water for these soft waters.
According to an embodiment of the present application, the boiler 600 may be a gas boiler 600. The gas boiler 600 plays a key role in the steelmaking process, and they convert solid fuel into fuel gas, provide heat energy, control temperature, promote the steelmaking process, and contribute to reduction of energy consumption and environmental impact. The gas boiler 600 requires water to produce steam, which is commonly referred to as a "boiler feed water. These water supplies are heated in the boiler 600 and converted to steam, which is then transferred to a steelmaking furnace or other use for heating and smelting the steel raw materials. And also to control the temperature and pressure within the gas boiler 600 to ensure the operation stability and safety of the boiler 600.
According to the embodiment of the application, through the arrangement of the water accumulator, the first pump, the boiler and the desalted water unit, redundant steam condensate can be reasonably utilized, and waste is reduced. And the steam condensate water has stable and better water quality, is beneficial to reducing the operation of the reverse osmosis system, and saves the operation electricity consumption, the medicament increase, the reverse osmosis membrane replacement and other expenses of the water making system. And recovering the surplus condensed water as the water replenishing of the desalted water unit, and relieving the water pressure of the desalted water unit.
In accordance with an embodiment of the present application, a desalination water station unit generally comprises the following key components:
Desalination water station transfer pond (SETTLING TANK): the transfer pond in the desalination water station is used for settling suspended solid particles in raw water from a raw water source after the raw water is subjected to primary treatment so as to purify the water quality. This helps remove silt, dirt and other solid impurities for subsequent treatment.
Desalination water station mixed bed (Ion Exchange Beds): the mixed bed of the desalination water station is a device for removing ions and dissolved substances in water. Ion exchange resin beds are commonly used in which a positive ion exchange resin and a negative ion exchange resin are alternately used to remove cations and anions from water, thereby reducing the salt concentration. This process can produce pure fresh water.
Product pool (Product WATER TANK): the product water tank is used for storing fresh water generated after the desalination water station is used for processing. This pond is commonly used to store, dispense and supply clean fresh water to meet the needs of potable, industrial, or other uses.
Booster Pump): the booster pump is used to boost the fresh water produced by the desalination station to a sufficient pressure to ensure that it can flow through the transport pipe and where it is needed. Since desalination processes typically reduce the pressure of water, a booster pump is necessary to ensure that the water is efficiently delivered to the desired location.
The design of the desalination water station unit can realize the utilization of steam condensate and lighten the pressure of the water. The desalted water unit can also include a sedimentation tank, a filtration system, an ion exchanger, a neutralization device, an evaporator, and a chemical agent treatment system. The design and configuration of the desalination water station unit depends on the specific steel production process and water quality requirements to ensure the efficiency and environmental protection of wastewater treatment.
High purity water (High purity water) refers to water having a conductivity of less than 0.1 μs/cm and a residual salt content of less than 0.3mg/L at 25 ℃ and from which non-dielectric trace bacteria, microorganisms, particulates and other impurities are removed. When the steam condensate is transported to the desalted water unit 800 through the pipeline, some impurities including metal rust and the like are contained in the pipeline, so that the quality of the steam condensate is reduced, and therefore, the desalted water unit 800 needs to use the desalted water station mixed bed 820 for impurity removal.
The boiler 600 uses the steam condensate, and the steam condensate can be vaporized to generate power by the related power generation equipment, thereby achieving the purpose of utilizing the steam condensate.
In some embodiments, the water reservoir 100 includes a water level detector for detecting the amount of water of the steam condensate in the water reservoir 100.
According to the embodiment of the application, the water level detector can be a commercially available float type water level switch, a commercially available pressure sensor and also can be an integrated water level detector of the water reservoir 100.
In some embodiments, the system includes a first valve body 400, the first valve body 400 being disposed downstream of the first pump 200, the first pump 200 being in communication with the boiler 600 and the desalinated water unit 800, respectively, through the first valve body 400.
The first valve body 400 can control the steam condensate transport, adjusting the amount of water transported to the boiler 600 and the desalted water unit 800.
According to an embodiment of the present application, the first valve body 400 may be a DN80 gate valve, and further includes DN80 metal sealing gaskets disposed in the DN80 gate valve, and the number of the sealing gaskets may be 2.
In some embodiments, the system includes a controller 300, the controller 300 is communicatively connected to the first valve body 400 and the water level detector, respectively, and the controller 300 controls the opening and closing of the first valve body 400 according to the amount of water detected by the water level detector.
According to the embodiment of the present application, when the water level in the water reservoir 100 reaches a certain level, the water level detector detects the water level value and sends a signal to the controller 300, the controller 300 receives the signal, and the first pump 200 automatically starts the pumping operation to send the steam condensate into the desalted water unit 800, and may also be sent to the boiler 600.
In some embodiments, the system includes a second valve body 500, the second valve body 500 disposed between the first valve body 400 and the boiler 600, the second valve body 500 configured to control the on-off between the first valve body 400 and the boiler 600.
In some embodiments, the system includes a third valve body 700, the third valve body 700 being disposed between the first valve body 400 and the desalinated water unit 800, the third valve body 700 being configured to control on-off between the first valve body 400 and the desalinated water unit 800.
In some embodiments, the product water basin 830 includes a receiving basin connected to the desalination water station mixed bed 820 and configured to receive and store high purity water, and a water quality detection system disposed in the receiving basin, the detection system configured to detect a water quality parameter of the high purity water, the water quality parameter including at least one of conductivity, calcium ion concentration, and magnesium ion concentration.
The water in the product water reservoir 830 may be transported to a heating furnace for controlling the temperature of the heating furnace or may include the heating furnace. When the water quality in the product water reservoir 830 is poor, other impurities such as scale may be generated in the heating furnace, degrading the performance of the heating furnace.
According to the embodiment of the application, the water quality detection device can be a commercially available metal ion analyzer, a conductivity meter, a water quality analyzer and the like. Conductivity meters measure electrical conductivity in a body of water, and are commonly used to evaluate the clarity and clarity of water. The metal ion analyzer is used for measuring the metal ion content in the water body. The water quality analyzer can perform multi-parameter detection such as pH, conductivity dissolved oxygen, turbidity, temperature and the like.
In some embodiments, desalinated water unit 800 further includes a return leg connected between product reservoir 830 and desalinated water station mixing bed 820, the return leg provided with a second pump 840, the second pump 840 configured to be turned on when a water quality parameter exceeds a preset threshold value to return high purity water from product reservoir 830 to desalinated water station mixing bed 820.
In some embodiments, the length of the line between the outlet of the first pump 200 and the transfer tank 810 in the desalination water station is 300 meters to 400 meters.
According to an embodiment of the present application, a DN50 pipeline of 350 meters is installed along an energy medium pipe rack at the outlet of the first pump 200 of the post-steel cogeneration system until reaching the desalination water station transfer pond 810, so as to fully utilize the space in the desalinated water unit 800.
In some embodiments, the desalinated water unit 800 includes a booster pump 850, the booster pump 850 being connected to the product reservoir 830.
In accordance with an embodiment of the present application, booster pump 850 may provide pressure to allow the outflow and use of the high purity water in product tank 830.
The system for recycling the steam condensate in the embodiment of the application has the advantages that the condensate amount conveyed per hour reaches 60-100 tons, the effective recycling of the rich condensate is effectively ensured, the pressure and the operation cost of a soft water preparation system of a desalted water unit are reduced, and the service life of a reverse osmosis membrane is prolonged.
The economic benefit is calculated by the following steps: the monthly water-saving wound effect is 60t/h multiplied by 24h multiplied by 30d multiplied by 0.5 yuan
T=2.16 ten thousand yuan.
Monthly electricity-saving wound effect (22+37) kwh×24h×30d0.65 yuan/kwh= 2.7612 ten thousand yuan, and the total of the two items is 4.9212 ten thousand yuan.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. A system for recycling steam condensate, comprising:
A water reservoir for collecting and storing steam condensate;
a first pump in communication with the reservoir;
A boiler in communication with the first pump, the boiler configured to receive and vaporize at least a portion of the steam condensate;
A desalinated water unit in communication with the first pump, the desalinated water unit including a desalinated water station transit tank in communication with the water reservoir and configured to store at least a portion of the steam condensate, a desalinated water station mixed bed in communication with the desalinated water station transit tank and configured to remove impurities in the steam condensate to provide high purity water, and a product water tank in communication with the desalinated water station mixed bed and configured to receive and store the high purity water.
2. The system of claim 1, wherein the water reservoir includes a water level detector for detecting an amount of the vapor condensate water in the water reservoir.
3. The system of claim 2, comprising a first valve body disposed downstream of the first pump, the first pump in communication with the boiler and the desalinated water unit through the first valve body, respectively.
4. A system according to claim 3, comprising a controller in communication with the first valve body and the water level detector, respectively, the controller controlling the opening and closing of the first valve body in response to the amount of water detected by the water level detector.
5. The system of claim 3, comprising a second valve body disposed between the first valve body and the boiler, the second valve body configured to control on-off between the first valve body and the boiler.
6. The system of claim 3, comprising a third valve body disposed between the first valve body and the desalinated water unit, the third valve body configured to control the on-off between the first valve body and the desalinated water unit.
7. The system of claim 1, wherein the product water basin comprises a holding tank and a water quality detection system disposed in the holding tank, the holding tank being connected to the desalination water station mixed bed and configured to receive and store the high purity water, the detection system configured to detect a water quality parameter of the high purity water, the water quality parameter comprising at least one of conductivity, calcium ion concentration, and magnesium ion concentration.
8. The system of claim 7, wherein the desalinated water unit further comprises a return branch connected between the product tank and the desalinated water station mixing bed, the return branch being provided with a second pump configured to be turned on when the water quality parameter exceeds a preset threshold to return the high purity water of the product tank to the desalinated water station mixing bed.
9. The system of claim 1, wherein a length of the line between the outlet of the first pump and the transfer tank of the desalination water station is 300 meters to 400 meters.
10. The system of claim 1, wherein the desalinated water unit includes a booster pump, the booster pump being connected to the product water reservoir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322510954.4U CN220852114U (en) | 2023-09-14 | 2023-09-14 | System for recycling steam condensate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322510954.4U CN220852114U (en) | 2023-09-14 | 2023-09-14 | System for recycling steam condensate |
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| Publication Number | Publication Date |
|---|---|
| CN220852114U true CN220852114U (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322510954.4U Active CN220852114U (en) | 2023-09-14 | 2023-09-14 | System for recycling steam condensate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220852114U (en) |
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2023
- 2023-09-14 CN CN202322510954.4U patent/CN220852114U/en active Active
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