CN221944258U - Novel composite phase change heat exchanger - Google Patents
Novel composite phase change heat exchanger Download PDFInfo
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- CN221944258U CN221944258U CN202420214950.3U CN202420214950U CN221944258U CN 221944258 U CN221944258 U CN 221944258U CN 202420214950 U CN202420214950 U CN 202420214950U CN 221944258 U CN221944258 U CN 221944258U
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- heat exchanger
- tube bundle
- phase change
- composite phase
- novel composite
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- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 230000000630 rising effect Effects 0.000 claims abstract description 12
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 5
- 239000011555 saturated liquid Substances 0.000 claims abstract description 5
- 239000003546 flue gas Substances 0.000 claims description 24
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 17
- 239000004071 soot Substances 0.000 claims description 17
- 230000001174 ascending effect Effects 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000011344 liquid material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The novel composite phase change heat exchanger comprises an upper section heat exchanger and a lower section heat exchanger, wherein a rising pipe for saturated steam exchange and a falling pipe for saturated liquid exchange are connected between the upper section heat exchanger and the lower section heat exchanger, a plurality of groups of tube bundle collecting pipes are arranged at the joints of the lower section heat exchanger and the rising pipe and the joints of the lower section heat exchanger and the falling pipe, and tube bundle collecting pipe isolating valves are arranged between the tube bundle collecting pipes and the rising pipe and between the tube bundle collecting pipes and the falling pipe; the heat-insulating layer is arranged at the bottom shell of the lower-section heat exchanger and used for raising the temperature of the bottom tube bundle of the shell side of the lower-section heat exchanger; designing leakage emergency facilities, realizing the aim that the upper heat exchanger can be continuously used when the lower heat exchange tube bundle leaks, and reducing the influence on the operation of devices and equipment; the tube bundle structure easy to overhaul is designed, and the problem of plugging and overhauling of the tube bundle of the lower-section heat exchanger is solved by optimizing the distribution form of the tube bundle of the heat exchanger.
Description
Technical Field
The utility model relates to the technical field of heat exchangers, in particular to a novel composite phase change heat exchanger.
Background
The composite phase-change heat exchanger technology and device is a novel high-efficiency energy-saving product which is widely applicable to various heat exchange equipment such as various fuel, fuel oil, gas boilers, industrial kilns, metallurgy, petrochemical industry and the like. The method is a comprehensive innovation and high-efficiency integration of thermodynamics, heat transfer science, boiler principle, automatic control and modern computing technology, well solves the worldwide problem that the exhaust temperature of the boiler is difficult to reduce, and is a worldwide breakthrough in the utilization of low-temperature heat sources.
The composite phase-change heat exchanger can realize closed-loop control on the lowest wall surface temperature of the tube bundle heating surface through the adjustment of the water quantity of the phase-change section, and realize the constancy or adjustment of the wall surface temperature of the tube bundle; however, when the composite phase change heat exchanger is in low-load operation in the actual production process, the wall temperature of the rear tube bundle of the lower-stage heat exchanger is lower; the temperature of the wall surface of the tube bundle is increased by adjusting the water quantity of the phase change section during the operation of the equipment, so that the operation is difficult to implement, and the equipment is difficult to control and easy to cause overtemperature and overpressure accidents. Therefore, the water quantity of the phase change section is well adjusted before the equipment is put into use, and the adjustment is generally not carried out in the running process. The conventional composite phase change heat exchanger equipment has no effective adjustment means for the operation load and has low operation elasticity; when the operation load of the composite phase change heat exchanger is too low, the temperature of an intermediate medium (softened water) and the wall surface of the tube bundle in the rear tube bundle of the lower-section heat exchanger is low, and the low-temperature dew point corrosion leakage phenomenon of the rear tube bundle at the smoke side easily occurs (the structure of the conventional composite phase change heat exchanger is shown in figures 3 and 4).
And the shell side of the lower section heat exchanger of the conventional composite phase change heat exchanger has low points, the bottom of the shell side is easy to deposit impurities such as smoke dust, and the flue gas side fin heat exchange tube is immersed in an ash accumulation layer, so that the heat transfer efficiency of the heat exchange tube is affected, the temperature of a tube bundle immersed in the ash accumulation layer is lower than the dew point temperature of flue gas, and the tube bundle is extremely easy to corrode and leak due to dew point.
Moreover, the steam heating part of the upper-stage heat exchanger cannot be used due to the leakage of the lower-stage heat exchanger tube bundle of the conventional composite phase change heat exchanger, and the device and equipment are greatly influenced. After the rear tube bundle of the conventional composite phase change lower heat exchanger corrodes and leaks, the leakage tube bundle cannot be overhauled and plugged due to dense arrangement of the tube bundles.
Disclosure of Invention
In order to solve the technical defects in the prior art, the utility model provides a novel composite phase change heat exchanger, and the low-temperature dew point corrosion leakage of a tube bundle is avoided by designing a load adjusting facility and an ash deposition preventing facility; designing leakage emergency facilities, realizing the aim that the upper heat exchanger can be continuously used when the lower heat exchange tube bundle leaks, and reducing the influence on the operation of devices and equipment; the tube bundle structure easy to overhaul is designed, and the problem of plugging and overhauling of the tube bundle of the lower-section heat exchanger is solved by optimizing the distribution form of the tube bundle of the heat exchanger.
The technical scheme adopted by the utility model is as follows: the utility model provides a novel compound phase transition heat exchanger, includes upper segment heat exchanger and hypomere heat exchanger, upper segment heat exchanger and hypomere heat exchanger between be connected with the tedge that is used for saturated steam exchange and be used for saturated liquid exchange, still include:
The tube bundle collecting pipes are in a plurality of groups and are arranged at the joints of the lower section heat exchanger and the ascending tube and the joints of the lower section heat exchanger and the descending tube;
The tube bundle collecting pipe isolating valves are arranged between the tube bundle collecting pipes and the ascending pipes as well as between the tube bundle collecting pipes and the descending pipes, and the tube bundle collecting pipe isolating valves are in one-to-one correspondence with the number of the tube bundle collecting pipes;
The heat preservation layer is arranged at the bottom shell of the lower heat exchanger and used for improving the temperature of the bottom tube bundle of the shell pass of the lower heat exchanger.
The device also comprises a thermometer, wherein the thermometer is arranged on the tube bundle collecting tube to monitor the temperature of the intermediate medium in the tube bundle collecting tube.
The device comprises a lower section heat exchanger, an upper section heat exchanger, a lower section heat exchanger, a device flange, a gas inlet and a gas outlet, wherein the device flange is respectively arranged on the air inlet and the air outlet of the upper section heat exchanger and the gas inlet and the gas outlet of the lower section heat exchanger.
The bottom of the shell side of the lower heat exchanger is in the same height as the bottom of the equipment flange.
The device also comprises a soot blowing component, wherein the soot blowing component is arranged at the bottom of the shell side at the smoke inlet of the lower section heat exchanger.
The soot blowing component is formed by horizontally welding a plurality of soot blowing nozzles on an external industrial air pipe line along the flow direction of a flue gas medium, and is installed close to the bottom of the shell side of the lower section heat exchanger.
The device also comprises a rising pipe isolating valve and an external standby steam interface, wherein the rising pipe isolating valve and the external standby steam interface are arranged on the rising pipe.
The device also comprises a down pipe isolating valve and an external standby steam condensate port, wherein the down pipe isolating valve and the external standby steam condensate port are arranged on the down pipe.
The flue gas outlet side first and second rows of the lower section heat exchanger fin heat exchange tube bundles are larger than the spacing between other rows of lower section heat exchanger fin heat exchange tube bundles, and the first row of the flue gas outlet side first row of the lower section heat exchanger fin heat exchange tube bundles is larger than the spacing between the second row of the lower section heat exchanger fin heat exchange tube bundles.
The first row of the flue gas outlet side the interval between the lower section heat exchanger fin heat exchange tube bundles is 3 times of the interval between other lower section heat exchanger fin heat exchange tube bundles, and the second row of the flue gas outlet side the interval between the lower section heat exchanger fin heat exchange tube bundles is 1.5 times of the interval between other lower section heat exchanger fin heat exchange tube bundles.
The beneficial effects of the utility model are as follows: the utility model provides a novel composite phase change heat exchanger, which comprises an upper section heat exchanger and a lower section heat exchanger, wherein a rising pipe for saturated steam exchange and a falling pipe for saturated liquid exchange are connected between the upper section heat exchanger and the lower section heat exchanger, the heat exchanger further comprises a plurality of groups of tube bundle collecting pipes arranged at the joints of the lower section heat exchanger and the ascending tube and the joints of the lower section heat exchanger and the descending tube, and tube bundle collecting pipe isolating valves arranged between the tube bundle collecting pipes and the ascending tube and between the tube bundle collecting pipes and the descending tube are in one-to-one correspondence with the number of the tube bundle collecting pipes; the heat-insulating layer is arranged at the bottom shell of the lower-section heat exchanger and used for raising the temperature of the bottom tube bundle of the shell side of the lower-section heat exchanger; designing leakage emergency facilities, realizing the aim that the upper heat exchanger can be continuously used when the lower heat exchange tube bundle leaks, and reducing the influence on the operation of devices and equipment; the tube bundle structure easy to overhaul is designed, and the problem of plugging and overhauling of the tube bundle of the lower-section heat exchanger is solved by optimizing the distribution form of the tube bundle of the heat exchanger.
Drawings
FIG. 1 is a schematic diagram of a novel composite phase change heat exchanger.
Fig. 2 is a schematic view of the lower heat exchanger of the present utility model.
Fig. 3 is a schematic diagram of a conventional composite phase change heat exchanger.
Fig. 4 is a schematic diagram of a lower heat exchanger of a conventional composite phase change heat exchanger.
The device comprises a 1-upper section heat exchanger, a 2-lower section heat exchanger, a 3-rising pipe, a 4-falling pipe, a 5-pipe bundle collecting pipe, a 6-pipe bundle collecting pipe isolating valve, a 7-equipment flange, an 8-soot blowing component, an 11-air inlet, a 12-air outlet, a 21-flue gas inlet, a 22-flue gas outlet, a 23-lower section heat exchanger fin heat exchange pipe bundle, a 24-shell side, a 31-rising pipe isolating valve, a 32-external standby steam interface, a 41-falling pipe isolating valve and a 42-external standby steam condensate interface.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the utility model, are within the scope of the utility model based on the embodiments of the utility model.
The utility model provides a novel compound phase transition heat exchanger, includes upper segment heat exchanger 1 and hypomere heat exchanger 2, upper segment heat exchanger 1 and hypomere heat exchanger 2 between be connected with the tedge 3 that is used for saturated steam exchange and be used for saturated liquid exchange 4, still include: 3 groups of tube bundle collecting tubes 5 arranged at the joints of the lower heat exchanger 2 and the ascending tubes 3 and the joints of the lower heat exchanger 2 and the descending tubes 4; the tube bundle collecting pipe isolating valves 6 are arranged between the tube bundle collecting pipes 5 and the ascending pipes 3 and between the tube bundle collecting pipes 5 and the descending pipes 4, and the tube bundle collecting pipe isolating valves 6 are in one-to-one correspondence with the number of the tube bundle collecting pipes 5; the method is characterized in that the ascending pipe and the descending pipe of the lower section heat exchanger of the novel composite phase change heat exchanger are optimized and improved, the ascending pipe and the descending pipe of the lower section heat exchanger are divided into three groups of pipe bundle collecting pipes, valves are respectively added on each group of pipe bundle collecting pipes, when the operation load of the phase change heat exchanger is reduced, the softened water temperature of intermediate mediums in the rear pipe bundle is also reduced, and at the moment, the valves of the third group of pipe bundle collecting pipes and the second group of pipe bundle collecting pipes can be sequentially closed according to the load change condition, so that the phase change heat exchanger has better operation elasticity; the heat-insulating layer is arranged at the bottom shell of the lower-section heat exchanger 2 and used for improving the temperature of the bottom tube bundle of the shell side of the lower-section heat exchanger 2, so that low-temperature dew point corrosion leakage of the rear tube bundle of the lower-section heat exchanger is avoided.
The system also comprises a thermometer, wherein the thermometer is arranged on the tube bundle collecting pipes 5 to monitor the temperature of the intermediate medium in the tube bundle collecting pipes 5, and the temperature of softened water of the intermediate medium in the tube bundle is monitored through the temperature of each group of tube bundle collecting pipes; when the operation load of the phase-change heat exchanger is reduced, the softening water temperature of the intermediate medium in the rear tube bundle is also reduced, and at the moment, the third group of tube bundle collecting tube valves and the second group of tube bundle collecting tube valves can be sequentially closed according to the load change condition, so that the phase-change heat exchanger has better operation elasticity.
The device comprises a device flange 7, wherein the device flange 7 is respectively arranged on an air inlet 11 and an air outlet 12 of the upper-stage heat exchanger 1 and a flue gas inlet 21 and a flue gas outlet 22 of the lower-stage heat exchanger 2.
The bottom of the shell side 24 of the lower heat exchanger 2 is in height with the bottom of the equipment flange 7. The device also comprises a soot blowing component 8, wherein the soot blowing component 8 is arranged at the bottom of a shell side at the smoke inlet 21 of the lower heat exchanger 2. According to the utility model, by canceling the low point of the lower heat exchanger shell side, the bottom of the lower heat exchanger shell side is consistent with the elevation of the bottom of the equipment inlet and outlet flange, so that impurities such as smoke dust are not easy to deposit at the bottom of the lower heat exchanger shell side; meanwhile, a soot blowing component is designed at the bottom of the shell side of the lower-section heat exchanger, and industrial air is regularly used for blowing the bottom of the shell side of the lower-section heat exchanger, so that the bottom is ensured not to have soot deposit.
The soot blowing component 8 is formed by horizontally welding a plurality of soot blowing nozzles on an external industrial air pipeline along the flow direction of a flue gas medium, and the soot blowing component 8 is installed close to the bottom of the shell side of the lower-section heat exchanger 2.
The device also comprises a rising pipe isolating valve 31 and an external standby steam interface 32, wherein the rising pipe isolating valve 31 and the external standby steam interface 32 are arranged on the rising pipe 3. The device also comprises a down pipe isolating valve 41 and an external standby steam condensate port 42, wherein the down pipe isolating valve 41 and the external standby steam condensate port 42 are arranged on the down pipe 4. The utility model designs a leakage emergency facility, a block valve and a steam flow are designed for a steam rising pipe of an upper-section heat exchanger, and a block valve and a steam condensate drainage flow are designed for a header pipe of a condensate falling pipe of the upper-section heat exchanger. After corrosion leakage occurs in the lower-section heat exchanger tube bundle, the ascending tube and the descending tube block valve are closed, an external spare steam and condensed water drainage flow is put into use, low-temperature air or liquid materials of the upper-section heat exchanger are heated, normal heat exchange of the low-temperature air or the liquid materials is guaranteed, and the influence of corrosion leakage of the lower-section heat exchanger tube bundle on the operation of the device and equipment is reduced. Steam, condensate pressure grade and pipeline diameter are determined according to equipment heat exchange load and equipment design pressure accounting, and steam below 1.3MPa is generally considered.
The flue gas outlet 22 side first and second rows of the lower section heat exchanger fin heat exchange tube bundles 23 are larger than the spaces among other rows of the lower section heat exchanger fin heat exchange tube bundles 23, and the space among the lower section heat exchanger fin heat exchange tube bundles 23 at the flue gas outlet 22 side first row is also larger than the space among the second row of the lower section heat exchanger fin heat exchange tube bundles 23. The space between the lower-stage heat exchanger fin heat exchange tube bundles 23 on the first row at the flue gas outlet 22 side is 3 times that between the other lower-stage heat exchanger fin heat exchange tube bundles 23, and the space between the lower-stage heat exchanger fin heat exchange tube bundles 23 on the second row at the flue gas outlet 22 side is 1.5 times that between the other lower-stage heat exchanger fin heat exchange tube bundles 23. The utility model designs an easy-to-overhaul tube bundle structure, and on the premise of meeting the heat exchange capacity, the last two rows of dense tube bundles which are easy to corrode and leak and difficult to overhaul of the lower-stage heat exchanger are reasonably distributed, the interval between the last two rows of tube bundles is increased, and the leakage stoppage overhaul can be effectively carried out by cutting off the last two rows of tube bundles after the leakage of the last two rows of tube bundles. The structure reduces the number of the first row of the penultimate discharge tube bundles and the second row of the penultimate discharge tube bundles by 2/3 and 1/3 respectively, and the penultimate discharge tube bundles and the second row of the penultimate discharge tube bundles are uniformly arranged; the distribution of the heat exchanger tube bundles is optimized, so that the interval between the tube bundles of the first row of the reciprocal is increased by 3 times, and the interval between the tube bundles of the second row of the reciprocal is increased by 1.5 times; through field practice demonstration, the increase of the tube bundle spacing improves the working face of overhauling and plugging, reduces the overhauling difficulty and improves the overhauling efficiency.
The skilled person will know: while the utility model has been described in terms of the foregoing embodiments, the inventive concepts are not limited to the utility model, and any modifications that use the inventive concepts are intended to be within the scope of the appended claims.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (10)
1. The utility model provides a novel compound phase transition heat exchanger, includes upper segment heat exchanger (1) and hypomere heat exchanger (2), upper segment heat exchanger (1) and hypomere heat exchanger (2) between be connected with rising pipe (3) that are used for saturated steam exchange and be used for saturated liquid exchange's downcomer (4), its characterized in that still includes:
the tube bundle collecting pipes (5) are arranged at the joints of the lower section heat exchanger (2) and the ascending tube (3) and the joints of the lower section heat exchanger (2) and the descending tube (4) in a number of groups;
The tube bundle collecting pipe isolating valves (6) are arranged between the tube bundle collecting pipes (5) and the ascending tubes (3) and between the tube bundle collecting pipes (5) and the descending tubes (4), and the tube bundle collecting pipe isolating valves (6) are in one-to-one correspondence with the number of the tube bundle collecting pipes (5);
The heat preservation layer is arranged at the bottom shell of the lower-section heat exchanger (2) and used for improving the temperature of the bottom tube bundle of the shell side of the lower-section heat exchanger (2).
2. The novel composite phase change heat exchanger according to claim 1, further comprising a thermometer, wherein the thermometer is arranged on the tube bundle collecting tube (5) to monitor the temperature of an intermediate medium in the tube bundle collecting tube (5).
3. The novel composite phase change heat exchanger according to claim 1, further comprising an equipment flange (7), wherein the equipment flange (7) is respectively arranged on an air inlet (11) and an air outlet (12) of the upper-stage heat exchanger (1) and a flue gas inlet (21) and a flue gas outlet (22) of the lower-stage heat exchanger (2).
4. A novel composite phase change heat exchanger according to claim 3, wherein the bottom of the shell side (24) of the lower heat exchanger (2) is in high conformity with the bottom of the equipment flange (7).
5. The novel composite phase change heat exchanger according to claim 4, further comprising a soot blowing component (8), wherein the soot blowing component (8) is arranged at the bottom of a shell side at a flue gas inlet (21) of the lower-stage heat exchanger (2).
6. The novel composite phase change heat exchanger according to claim 5, wherein the soot blowing component (8) is welded on an external industrial air pipeline horizontally along the flow direction of a flue gas medium by a plurality of soot blowing nozzles, and the soot blowing component (8) is installed close to the bottom of a shell side of the lower-section heat exchanger (2).
7. The novel composite phase change heat exchanger according to claim 1, further comprising a riser block valve (31) and an external standby steam interface (32), wherein the riser block valve (31) and the external standby steam interface (32) are arranged on the riser (3).
8. The novel composite phase change heat exchanger according to claim 1, further comprising a down pipe isolating valve (41) and an external standby steam condensate port (42), wherein the down pipe isolating valve (41) and the external standby steam condensate port (42) are arranged on the down pipe (4).
9. The novel composite phase change heat exchanger according to claim 1, further comprising lower-stage heat exchanger fin heat exchange tube bundles (23), wherein a plurality of the lower-stage heat exchanger fin heat exchange tube bundles (23) are longitudinally arranged in the lower-stage heat exchanger (2), each row of the lower-stage heat exchanger fin heat exchange tube bundles (23) in the lower-stage heat exchanger (2) is arranged at equal intervals, the interval between the first lower-stage heat exchanger fin heat exchange tube bundles (23) and the second lower-stage heat exchange tube bundles (23) on the side of a flue gas outlet (22) is larger than the interval between the lower-stage heat exchanger fin heat exchange tube bundles (23) of other rows, and the interval between the lower-stage heat exchanger fin heat exchange tube bundles (23) on the side of the flue gas outlet (22) is also larger than the interval between the lower-stage heat exchanger fin heat exchange tube bundles (23) of the second row.
10. The novel composite phase change heat exchanger according to claim 9, wherein the spacing between the lower heat exchanger fin heat exchange tube bundles (23) of the first row on the flue gas outlet (22) side is 3 times the spacing between the other lower heat exchanger fin heat exchange tube bundles (23), and the spacing between the lower heat exchanger fin heat exchange tube bundles (23) of the second row on the flue gas outlet (22) side is 1.5 times the spacing between the other lower heat exchanger fin heat exchange tube bundles (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420214950.3U CN221944258U (en) | 2024-01-30 | 2024-01-30 | Novel composite phase change heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420214950.3U CN221944258U (en) | 2024-01-30 | 2024-01-30 | Novel composite phase change heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221944258U true CN221944258U (en) | 2024-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202420214950.3U Active CN221944258U (en) | 2024-01-30 | 2024-01-30 | Novel composite phase change heat exchanger |
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| Country | Link |
|---|---|
| CN (1) | CN221944258U (en) |
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- 2024-01-30 CN CN202420214950.3U patent/CN221944258U/en active Active
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