CN220890274U - Steam turbine generator unit low-pressure heater drainage system and steam turbine generator unit - Google Patents
Steam turbine generator unit low-pressure heater drainage system and steam turbine generator unit Download PDFInfo
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- CN220890274U CN220890274U CN202322582187.8U CN202322582187U CN220890274U CN 220890274 U CN220890274 U CN 220890274U CN 202322582187 U CN202322582187 U CN 202322582187U CN 220890274 U CN220890274 U CN 220890274U
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 229910052757 nitrogen Inorganic materials 0.000 claims description 40
- 238000002955 isolation Methods 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 claims description 14
- 230000002209 hydrophobic effect Effects 0.000 description 30
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
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Abstract
The invention relates to a steam turbine generator unit low-pressure heater drainage system and a steam turbine generator unit, wherein the drainage system comprises a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a fourth low-pressure heater and a condenser, and the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are communicated with the condenser through steam transmission pipelines; a first drainage pipeline is arranged between the second low-pressure heater and the third low-pressure heater, an electric drainage regulating valve and a rear isolating valve are arranged on the first drainage pipeline, a drainage branch is further arranged on the first drainage pipeline, one end of the drainage branch is communicated with the first drainage pipeline between the electric drainage regulating valve and the second low-pressure heater, the other end of the drainage branch is communicated with the drainage pipeline between the rear isolating valve and the third low-pressure heater, and a branch valve is arranged on the drainage branch. Solves the problems of untimely drainage caused by large drainage resistance of some pipelines and unsmooth drainage in the existing drainage system.
Description
Technical Field
The disclosure relates to the technical field of steam turbine power generation, in particular to a steam turbine generator unit low-pressure heater drainage system and a steam turbine generator unit.
Background
At present, some 2X 320MW coal-fired generator sets of a thermal power plant are provided with subcritical, intermediate reheat, high and medium pressure combined cylinders, single-shaft and double-cylinder double-exhaust steam turbines and condensing steam turbines. Each steam turbine thermodynamic system is generally provided with four horizontal U-shaped pipe low-pressure heaters, namely a first low-pressure heater, a second low-pressure heater, a third low-pressure heater and a fourth low-pressure heater, and the total heat exchange areas of the four horizontal U-shaped pipe low-pressure heaters are 580 square meters, 740 square meters and 840 square meters respectively.
The normal drainage of the second low-pressure heater of the steam turbine set automatically flows to the third low-pressure heater step by step, but as the running period of the steam turbine set is prolonged, the steam extraction pressure difference between the second low-pressure heater and the third low-pressure heater is reduced, and especially when the load of the steam turbine set is below 200MW, the drainage requirements of the heaters cannot be met when the normal drainage regulating gate of the second low-pressure heater to the third low-pressure heater is fully opened, and the water level of the second low-pressure heater can be ensured only by opening the critical drainage of the second low-pressure heater. Therefore, the water drained from the heater directly enters the condenser, so that the heat loss of the unit is increased, the heat load of the condenser is increased, the heat consumption of the steam turbine is increased, and the stability of the drainage system is possibly even influenced.
Thus, a new low-pressure heater drainage system of a turbo generator set is needed to solve the above-mentioned problems.
Disclosure of utility model
The utility model aims at providing a turbo generator set low pressure heater drainage system and turbo generator set, it has solved the drainage resistance of some pipelines in the current drainage system big, and the drainage is unsmooth and leads to the drainage untimely problem that influences system stability.
In order to achieve the above objective, according to a first aspect of the present disclosure, a steam turbine generator unit low-pressure heater drainage system is provided, including a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a fourth low-pressure heater, and a condenser, where the first low-pressure heater, the second low-pressure heater, the third low-pressure heater, and the fourth low-pressure heater are respectively communicated with the condenser through steam transmission pipelines;
A first drainage pipeline is arranged between the second low-pressure heater and the third low-pressure heater, an electric drainage regulating valve and a rear isolation valve are respectively arranged on the first drainage pipeline, and the rear isolation valve is arranged between the electric drainage regulating valve and the third low-pressure heater;
The novel electric water drainage device is characterized in that a water drainage branch is further arranged on the first water drainage pipeline, one end of the water drainage branch is communicated with the first water drainage pipeline between the electric water drainage regulating valve and the second low-pressure heater, the other end of the water drainage branch is communicated with the water drainage pipeline between the rear isolation valve and the third low-pressure heater, and the water drainage branch is provided with a branch valve.
In some embodiments, a first critical drain pipeline is connected between the second low-pressure heater and the condenser, and an electric regulating valve is arranged on the first critical drain pipeline.
In some embodiments, the first critical drain line is provided with a first gate valve at a position at both ends of the regulating valve, respectively.
In some embodiments, a second critical drainage pipeline is connected between the first low-pressure heater, the third low-pressure heater and the fourth low-pressure heater and the condenser respectively, and the second critical drainage pipeline is provided with a critical drainage pneumatic door;
And the second critical drainage pipeline is respectively provided with a second gate valve at the positions of the two sides of the critical drainage pneumatic door.
In some embodiments, a second hydrophobic pipeline is arranged between the first low-pressure heater and the second low-pressure heater, and a third hydrophobic pipeline is arranged between the third low-pressure heater and the fourth low-pressure heater;
pneumatic valves are respectively arranged on the second drainage pipeline and the third drainage pipeline, and isolation valves are respectively arranged at positions of the second drainage pipeline and the third drainage pipeline, which are positioned at two sides of the pneumatic valves.
In some embodiments, the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are respectively provided with an operation steam exhaust pipeline and a start steam exhaust pipeline;
the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the operation steam exhaust pipeline and the starting steam exhaust pipeline on the fourth low-pressure heater are respectively connected with the corresponding steam transmission pipeline;
And the operation steam exhaust pipeline, the starting steam exhaust pipeline and the steam transmission pipeline are respectively provided with a control valve.
In some embodiments, the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are respectively provided with a maintenance nitrogen charging device, so that nitrogen charging maintenance is performed in the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater through the maintenance nitrogen charging device.
In some embodiments, the maintenance nitrogen charging device comprises a nitrogen charging tank and a nitrogen charging pipeline, wherein one end of the nitrogen charging pipeline is connected with the nitrogen charging tank, and the other end of the nitrogen charging pipeline is connected to the starting exhaust pipeline;
and a nitrogen charging valve is arranged on the nitrogen charging pipeline.
In some embodiments, the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are respectively provided with a water drain pipe, and the water drain pipe is provided with a water drain valve
In a second aspect of the present disclosure, a turbo generator set is provided, including a turbo generator set low pressure heater drainage system as described in any one of the embodiments above.
Through above-mentioned technical scheme, through the electronic hydrophobic governing valve that sets up on the first hydrophobic pipeline between No. two low-pressure heater and No. three low-pressure heater, can be convenient for adjust it to in time carry out hydrophobic operation, with the local hydrophobic resistance in the relative reduction first hydrophobic pipeline, guarantee hydrophobic smoothness nature and timeliness, avoid this valve to open untimely trouble that causes the system. In addition, when the electric hydrophobic regulating valve is problematic, the hydrophobic branch can be used for conducting hydrophobic operation, so that the smoothness and stability of the hydrophobic operation of the system are further guaranteed, and the damage of the valve and other structures and the occurrence of shutdown events are reduced.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
Fig. 1 is a schematic diagram of an overall structure of a steam turbine generator unit low-pressure heater drainage system according to an embodiment of the disclosure.
Description of the reference numerals
1. A condenser; 21. a first low pressure heater; 22. a second low-pressure heater; 23. a third low-pressure heater; 24. a fourth low-pressure heater; 3. a steam transmission pipeline; 4. a first hydrophobic line; 41. a rear isolation valve; 42. an electric water-repellent regulating valve; 43. a hydrophobic branch; 44. a bypass valve; 5. a first critical hydrophobic line; 51. an electric regulating valve; 52. a first gate valve; 53. a second critical hydrophobic line; 54. a critical hydrophobic pneumatic door; 55. a second gate valve; 6. a second hydrophobic line; 61. a third hydrophobic line; 62. a pneumatic valve; 63. an isolation valve; 7. operating a steam exhaust pipeline; 71. starting a steam exhaust pipeline; 8. maintaining the nitrogen charging device; 81. a nitrogen charging tank; 82. a nitrogen charging pipeline; 9. a water drain pipe; 91. and a water drain valve.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The disclosure provides a steam turbine generator unit low pressure heater drainage system, as shown in fig. 1, the steam turbine generator unit low pressure heater drainage system includes a low pressure heater 21, a second low pressure heater 22, a third low pressure heater 23, a fourth low pressure heater 24 and a condenser 1, wherein, the low pressure heater 21, the second low pressure heater 22, the third low pressure heater 23 and the fourth low pressure heater 24 are respectively communicated with the condenser 1 through a steam transmission pipeline 3, so as to transmit water vapor into the condenser 1 through the steam transmission pipeline 3, a first drainage pipeline 4 is arranged between the second low pressure heater 22 and the third low pressure heater 23, an electric drainage regulating valve 42 and a rear isolation valve 41 are respectively arranged on the first drainage pipeline 4, and the rear isolation valve 41 is arranged between the electric drainage regulating valve 42 and the third low pressure heater 23.
In addition, a drain branch 43 is further provided on the first drain pipe 4, one end of the drain branch 43 communicates with the first drain pipe 4 located between the electric drain regulator valve 42 and the No. two low-pressure heater 22, the other end communicates with the drain pipe located between the rear isolation valve 41 and the No. three low-pressure heater 23, and a branch valve 44 is provided on the drain branch 43.
Through the setting of above-mentioned structure, when the condition that the steam extraction pressure difference between No. two low-pressure heater 22 and No. three low-pressure heater 23 reduces appears to when carrying out the drainage through first hydrophobic pipeline 4, owing to cancelled the preceding isolating valve 63 of original on first hydrophobic pipeline 4, can reduce the local hydrophobic resistance of this position department in the first hydrophobic pipeline 4 relatively, and utilize the setting of electronic hydrophobic governing valve 42, can be convenient for open this electronic hydrophobic governing valve 42 voluntarily, so that in time carry out the operation of hydrophobic, guarantee the timeliness of hydrophobic, avoid this valve to open untimely trouble that causes the system. Meanwhile, due to the added drainage branch 43, when a problem occurs at the electric drainage regulating valve 42, drainage can be performed through the drainage branch 43, so that the stability of the system is ensured, further, on the condition that the system is just started, the branch valve 44 can be opened relatively, so that the temperature difference at two sides of the electric drainage regulating valve 42 can be reduced relatively, the damage condition of structures such as a valve and the like and the occurrence of shutdown events are reduced, and then the branch valve 44 is closed after the system operates normally.
In some embodiments, as shown in fig. 1, a first critical drain pipe 5 is connected between the second low pressure heater 22 and the condenser 1, and an electric regulating valve 51 is disposed on the first critical drain pipe 5.
Through the governing valve who sets up on first critical hydrophobic pipeline 5, replaced the pneumatic door that original set up on first critical hydrophobic pipeline 5, so utilize adjustable mode to can regulate and control this valve as required, avoid the condition of original pneumatic door full-open or full-closure, so, some resistance losses when can eliminate critical hydrophobic relatively.
Further, first gate valves 52 are provided at positions of the first critical drain pipes 5 at both ends of the regulating valve, respectively.
By means of the arrangement of the gate valve, the first critical drainage pipeline 5 can be further sealed stably, and meanwhile drainage can be achieved by opening the first gate valve 52 immediately when the first critical drainage pipeline 5 is needed.
In some embodiments, as shown in fig. 1, a second critical drain pipeline 53 is connected between the first low-pressure heater 21, the third low-pressure heater 23, and the fourth low-pressure heater 24 and the condenser 1, and a critical drain pneumatic door 54 is disposed on the second critical drain pipeline 53. In addition, second gate valves 55 are provided at positions on both sides of the critical drain pneumatic gate 54 in the second critical drain pipeline 53, respectively.
By means of the arrangement of the second critical drainage pipeline 53, when problems occur in the first low-pressure heater 21, the third low-pressure heater 23 and the fourth low-pressure heater 24, the critical drainage pneumatic door 54 can be opened timely to drain water into the condenser 1 through the second critical drainage pipeline 53.
In some embodiments, as shown in fig. 1, a second water drain pipe 6 is disposed between the first low-pressure heater 21 and the second low-pressure heater 22, a third water drain pipe 61 is disposed between the third low-pressure heater 23 and the fourth low-pressure heater 24, further, pneumatic valves 62 are disposed on the second water drain pipe 6 and the third water drain pipe 61, respectively, and isolation valves 63 are disposed at positions of the second water drain pipe 6 and the third water drain pipe 61 on both sides of the pneumatic valves 62, respectively.
By arranging the second drain pipeline 6 and the third drain pipeline 61, water in the first low-pressure heater 21 can enter the second low-pressure heater 22 to be continuously treated, and correspondingly, water in the third low-pressure heater 23 can enter the fourth low-pressure heater 24 through the third drain pipeline 61 to be continuously discharged.
In some embodiments, as shown in fig. 1, the operation exhaust pipe 7 and the start exhaust pipe 71 are respectively disposed on the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 and the fourth low-pressure heater 24, wherein the operation exhaust pipe 7 and the start exhaust pipe 71 on the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 and the fourth low-pressure heater 24 are respectively connected with the corresponding steam delivery pipe 3, for example, the operation exhaust pipe 7 and the start exhaust pipe 71 on the first low-pressure heater 21 are connected with the steam delivery pipe 3 between the first low-pressure heater 21 and the condenser 1, and the operation exhaust pipe 7 and the start exhaust pipe 71 on the second low-pressure heater 22 are connected with the steam delivery pipe 3 between the second low-pressure heater 22 and the condenser 1. In addition, control valves are arranged on the operation exhaust pipeline 7, the starting exhaust pipeline 71 and the steam transmission pipeline 3.
By means of the arrangement of the operation steam exhaust pipeline 7 and the pneumatic steam exhaust pipeline, when steam is required to be exhausted, the operation steam exhaust pipeline 7 can be started to conduct steam exhaust detection, steam is initially exhausted, and then the steam exhaust pipeline 71 is started continuously to conduct steam exhaust, so that the safety of the system is guaranteed.
In some embodiments, as shown in fig. 1, a maintenance nitrogen charging device 8 is provided on the first low pressure heater 21, the second low pressure heater 22, the third low pressure heater 23, and the fourth low pressure heater 24, respectively, to charge nitrogen into the first low pressure heater 21, the second low pressure heater 22, the third low pressure heater 23, and the fourth low pressure heater 24 for maintenance by the maintenance nitrogen charging device 8.
Thus, when the drainage system is not needed, the maintenance nitrogen charging device 8 can be used to charge nitrogen into the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 and the fourth low-pressure heater 24 so as to maintain the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 and the fourth low-pressure heater 24, thereby ensuring the service lives of the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 and the fourth low-pressure heater 24.
In this embodiment, the maintenance and nitrogen charging device 8 includes a nitrogen charging tank 81 and a nitrogen charging pipeline 82, one end of the nitrogen charging pipeline 82 is connected to the nitrogen charging tank 81, the other end is connected to the start-up exhaust pipeline 71, and at the same time, a nitrogen charging valve is provided on the nitrogen charging pipeline 82.
In this way, when the first low pressure heater 21, the second low pressure heater 22, the third low pressure heater 23, and the fourth low pressure heater 24 are stopped, the nitrogen charging tank 81 can be opened, and the nitrogen charging valve can be opened to charge nitrogen into the first low pressure heater 21, the second low pressure heater 22, the third low pressure heater 23, and the fourth low pressure heater 24, respectively, to perform maintenance, and the operation is also convenient.
In some embodiments, as shown in fig. 1, the drain pipes 9 are respectively provided on the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23, and the fourth low-pressure heater 24, and the drain valve 91 is provided on the drain pipe 9.
With the arrangement of the water drain pipe 9 and the water drain valve 91, when some problems occur in the first low-pressure heater 21, the second low-pressure heater 22, the third low-pressure heater 23 or the fourth low-pressure heater 24, water in the corresponding heater can be timely discharged through the water drain pipe 9, so that larger problems can be avoided.
Based on the same technical concept, the embodiment of the disclosure also provides a turbo generator set, which comprises the turbo generator set low-pressure heater drainage system related to the embodiment.
By arranging the steam turbine generator unit low-pressure heater drainage system in the steam turbine generator unit, the drainage resistance in some pipelines can be reduced, the drainage smoothness is ensured, the reliability of the drainage system is improved, and the damage of thermodynamic system equipment and the occurrence of unplanned outage events are effectively avoided.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (10)
1. The steam turbine generator unit low-pressure heater drainage system is characterized by comprising a first low-pressure heater, a second low-pressure heater, a third low-pressure heater, a fourth low-pressure heater and a condenser, wherein the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are respectively communicated with the condenser through steam transmission pipelines;
A first drainage pipeline is arranged between the second low-pressure heater and the third low-pressure heater, an electric drainage regulating valve and a rear isolation valve are respectively arranged on the first drainage pipeline, and the rear isolation valve is arranged between the electric drainage regulating valve and the third low-pressure heater;
The novel electric water drainage device is characterized in that a water drainage branch is further arranged on the first water drainage pipeline, one end of the water drainage branch is communicated with the first water drainage pipeline between the electric water drainage regulating valve and the second low-pressure heater, the other end of the water drainage branch is communicated with the water drainage pipeline between the rear isolation valve and the third low-pressure heater, and the water drainage branch is provided with a branch valve.
2. The steam turbine generator unit low-pressure heater drainage system of claim 1, wherein a first critical drainage pipeline is connected between the second low-pressure heater and the condenser, and an electric regulating valve is arranged on the first critical drainage pipeline.
3. The steam turbine generator unit low pressure heater drainage system of claim 2, wherein the first critical drainage pipeline is provided with a first gate valve at the positions of two ends of the regulating valve respectively.
4. The steam turbine generator unit low-pressure heater drainage system of claim 1, wherein a second critical drainage pipeline is connected between the first low-pressure heater, the third low-pressure heater and the fourth low-pressure heater and the condenser respectively, and a critical drainage pneumatic door is arranged on the second critical drainage pipeline;
And the second critical drainage pipeline is respectively provided with a second gate valve at the positions of the two sides of the critical drainage pneumatic door.
5. The steam turbine generator unit low-pressure heater drainage system of claim 1, wherein a second drainage pipeline is arranged between the first low-pressure heater and the second low-pressure heater, and a third drainage pipeline is arranged between the third low-pressure heater and the fourth low-pressure heater;
pneumatic valves are respectively arranged on the second drainage pipeline and the third drainage pipeline, and isolation valves are respectively arranged at positions of the second drainage pipeline and the third drainage pipeline, which are positioned at two sides of the pneumatic valves.
6. The steam turbine generator unit low-pressure heater drainage system of claim 1, wherein an operation steam exhaust pipeline and a start steam exhaust pipeline are respectively arranged on the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater;
the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the operation steam exhaust pipeline and the starting steam exhaust pipeline on the fourth low-pressure heater are respectively connected with the corresponding steam transmission pipeline;
And the operation steam exhaust pipeline, the starting steam exhaust pipeline and the steam transmission pipeline are respectively provided with a control valve.
7. The steam turbine generator unit low-pressure heater drainage system of claim 6, wherein maintenance nitrogen charging devices are respectively arranged on the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater so as to charge nitrogen into the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater for maintenance through the maintenance nitrogen charging devices.
8. The steam turbine generator unit low-pressure heater drainage system of claim 7, wherein the maintenance nitrogen charging device comprises a nitrogen charging tank and a nitrogen charging pipeline, one end of the nitrogen charging pipeline is connected with the nitrogen charging tank, and the other end of the nitrogen charging pipeline is connected to the starting steam exhaust pipeline;
and a nitrogen charging valve is arranged on the nitrogen charging pipeline.
9. The steam turbine generator unit low-pressure heater drainage system of claim 1, wherein the first low-pressure heater, the second low-pressure heater, the third low-pressure heater and the fourth low-pressure heater are respectively provided with a water drain pipe, and the water drain pipe is provided with a water drain valve.
10. A turbo-generator set, characterized by comprising a low-pressure heater drainage system of the turbo-generator set according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322582187.8U CN220890274U (en) | 2023-09-21 | 2023-09-21 | Steam turbine generator unit low-pressure heater drainage system and steam turbine generator unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322582187.8U CN220890274U (en) | 2023-09-21 | 2023-09-21 | Steam turbine generator unit low-pressure heater drainage system and steam turbine generator unit |
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| Publication Number | Publication Date |
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| CN220890274U true CN220890274U (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322582187.8U Active CN220890274U (en) | 2023-09-21 | 2023-09-21 | Steam turbine generator unit low-pressure heater drainage system and steam turbine generator unit |
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| Country | Link |
|---|---|
| CN (1) | CN220890274U (en) |
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2023
- 2023-09-21 CN CN202322582187.8U patent/CN220890274U/en active Active
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