CN218544506U - Boiler cooling system - Google Patents
Boiler cooling system Download PDFInfo
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- CN218544506U CN218544506U CN202222888183.8U CN202222888183U CN218544506U CN 218544506 U CN218544506 U CN 218544506U CN 202222888183 U CN202222888183 U CN 202222888183U CN 218544506 U CN218544506 U CN 218544506U
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Abstract
The utility model relates to a thermal power factory equipment overhauls technical field, concretely relates to boiler cooling system for to the inside cooling of boiler, the boiler is inside to be included: furnace entry, furnace and boiler afterbody flue that communicate in proper order include: the boiler water-cooled wall is formed by water-cooled pipelines and arranged on the wall surface in the boiler, the boiler water-cooled wall is provided with a water-cooled wall inlet pipeline, and the water-cooled wall inlet pipeline is arranged on the wall surface of the hearth inlet; a water tank; the input end of the circulating pump is connected with the water tank, and the output end of the circulating pump is connected with the water wall inlet pipeline; the inlet end of the steam-water separator is connected with the water-cooled wall of the boiler through a cooling water outlet pipe, and the water outlet end of the steam-water separator is connected with the water tank; this application adopts above-mentioned technical scheme, through the circulation of water at boiler water wall, takes away the heat of boiler inside, for the inside cooling of boiler, ensures that the boiler is inside under the even state of temperature distribution, cools down gradually, prolongs the life-span of boiler pipe wall.
Description
Technical Field
The utility model relates to a thermal power factory equipment overhauls technical field, concretely relates to boiler cooling system.
Background
As the boiler capacity of the thermal power plant is continuously increased, four pipes in the boiler are in a high-temperature and high-pressure state, the leakage phenomenon frequently occurs, and the explosion is easy; especially, the platen superheater, the final superheater, the low-temperature reheater and the high-temperature reheater of the boiler above the supercritical level are very easy to explode. The boiler is forced to be shut down due to leakage of four pipes, and unplanned shutdown occurs; generally, unplanned shutdown needs to enter a hearth quickly, maintenance and overhaul are carried out on a heating surface, and after the overhaul is finished, the grid connection of a unit is recovered quickly. In order to ensure that the maintainers work safely in the hearth, forced ventilation and cooling are generally carried out on the heating surface after the boiler is shut down, so that the temperature in the boiler is continuously reduced according to the specified requirements until the working conditions of the maintainers are met in the boiler. During forced ventilation cooling, the temperature of the wall of the heating surface at the air inlet of the hearth is reduced rapidly and is weakened in sequence along the direction of air, so that the temperature of the heating surface at different positions of the boiler is deviated. Because the measuring point of the wall temperature of the power station boiler is usually only arranged at the outlet of the pipe wall, the deviation is difficult to monitor, and further, the temperature distribution of different positions of the pipe wall is not uniform, so that the pipe wall is easy to crack, especially at a welding position; the life of the boiler walls is severely shortened.
The noun term:
1. and (4) four pipes: in a thermal power plant, "four pipes" means: water wall tubes, superheater tubes, reheater tubes and economizer tubes.
2. Unplanned shutdown: the method is called non-stop or mediation for short, generally, a command is issued in mediation, and when power generation is not needed or the load is reduced in a certain time period, the power plant can stop according to the regulation arrangement; an unscheduled outage refers to a situation where a crew is unavailable but not scheduled to be shut down.
3. Boiler: the special equipment belongs to a thermal power plant and is used for converting chemical energy of fuel into steam heat energy.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming when carrying out boiler maintenance, to the cooling of boiler forced draft, because temperature distribution is inhomogeneous, leads to boiler pipe wall crackle very easily, the defect of life-span shortens, and based on above circumstances, it is very necessary to develop a boiler cooling system who guarantees boiler pipe wall temperature distribution is even.
In order to achieve the above object, the utility model provides a boiler cooling system for to the inside cooling of boiler, the boiler is inside to include: furnace entry, furnace and boiler afterbody flue that communicate in proper order include:
the boiler water-cooled wall is formed by water-cooled pipelines and arranged on the wall surface in the boiler, the boiler water-cooled wall is provided with a water-cooled wall inlet pipeline, and the water-cooled wall inlet pipeline is arranged on the wall surface of the hearth inlet;
a water tank;
the input end of the circulating pump is connected with the water tank, and the output end of the circulating pump is connected with the water wall inlet pipeline;
the inlet end of the steam-water separator is connected with the water-cooled wall of the boiler through a cooling water outlet pipe, and the water outlet end of the steam-water separator is connected with the water tank.
Optionally, the method further comprises:
and the boiler water supply pipeline is connected with the water wall inlet pipeline through a boiler water supply regulating valve group.
Optionally, the boiler feedwater regulating valve group includes:
the first electric isolating valve, the bypass regulating valve and the second electric isolating valve are sequentially connected;
and the two ends of the main water supply electric valve are respectively connected with the first electric isolating valve and the second electric isolating valve.
Optionally, the method further comprises:
and the water tank water level electromagnetic valve is connected with the position, close to the middle, on the water tank.
Optionally, the method further comprises: and the circulating pump outlet regulating valve is arranged between the circulating pump and the water wall inlet pipeline.
Optionally, the method further comprises:
the boiler superheater group is arranged in the hearth and is connected with the steam outlet end of the steam-water separator; the boiler superheater group is connected with the flash tank through a superheater exhaust valve.
Optionally, further comprising;
the air feeder is communicated with a hearth air port arranged on the hearth and close to the hearth inlet;
and the induced draft fan is communicated with the flue at the tail part of the boiler.
Optionally, a blower blade is arranged on the blower; and the draught fan is provided with a draught fan movable blade.
Optionally, a boiler tail flue gas movable baffle is arranged at a position, close to the induced draft fan, on the boiler tail flue.
Optionally, a chimney is arranged at the output end of the induced draft fan.
Compared with the prior art, the technical scheme of the utility model have following advantage:
1. the utility model provides a boiler cooling system for to the inside cooling of boiler, the boiler is inside to be included: furnace entry, furnace and boiler afterbody flue that communicate in proper order include: the boiler water-cooled wall is formed by water-cooled pipelines and arranged on the wall surface in the boiler, the boiler water-cooled wall is provided with a water-cooled wall inlet pipeline, and the water-cooled wall inlet pipeline is arranged on the wall surface of the hearth inlet; a water tank; the input end of the circulating pump is connected with the water tank, and the output end of the circulating pump is connected with the water wall inlet pipeline; the inlet end of the steam-water separator is connected with the water-cooled wall of the boiler through a cooling water outlet pipe, and the water outlet end of the steam-water separator is connected with the water tank; this application adopts above-mentioned technical scheme, through the circulation of water at boiler water wall, takes away the heat of boiler inside, for the inside cooling of boiler, ensures that the boiler is inside under the even state of temperature distribution, cools down gradually, prolongs the life-span of boiler pipe wall.
2. The utility model provides a boiler cooling system still includes: the boiler water supply pipeline is connected with the water wall inlet pipeline through a boiler water supply regulating valve group; this application adopts above-mentioned technical scheme, and the water level in the water tank reduces gradually, when being difficult to satisfy formation circulating water, carries out the moisturizing to the hydrologic cycle part through the boiler on the boiler feed water pipeline regulation valve group of supplying water.
3. Boiler feed water regulating valve group includes: the first electric isolation valve, the bypass regulating valve and the second electric isolation valve are connected in sequence; the main water supply electric valve is provided with two ends which are respectively connected with the first electric isolating valve and the second electric isolating valve; by adopting the technical scheme, when water needs to be supplemented, the bypass regulating valve is fully opened, and at the moment, the main water supply water feeding electric valve is opened; then gradually closing the bypass regulating valve, finally closing the first electric isolating valve and the second electric isolating valve, and switching the water supply from the bypass to the main path for operation. When water supply is stopped, the first electric isolation valve and the second electric isolation valve are opened, the bypass adjusting valve is fully opened, the main water supply and water feeding electric valve is closed, and water feeding is switched from the main path to the bypass operation; and stable water supply and water cut-off are ensured.
4. The utility model provides a boiler cooling system still includes: the water tank water level electromagnetic valve is connected with a position on the water tank close to the middle; this application adopts above-mentioned technical scheme, when the moisturizing of the boiler regulating valve group of supplying water on through boiler water supply pipe is too much, and the water level in the water tank is too high, discharges the water tank with unnecessary water through water tank water level solenoid valve.
5. The utility model provides a boiler cooling system still includes: the circulating pump outlet regulating valve is arranged between the circulating pump and the water wall inlet pipeline; this application adopts above-mentioned technical scheme, adjusts the flow of circulating water through circulating pump outlet governing valve, prevents that the inside cooling rate of boiler is too fast.
6. The utility model provides a boiler cooling system still includes: the boiler superheater group is arranged in the hearth and is connected with the steam outlet end of the steam-water separator; the boiler superheater group is connected with the flash tank through a superheater exhaust valve; this application adopts above-mentioned technical scheme, and the steam through the catch water separation carries the heat of boiler superheater group and discharges into the flash tank and retrieve, also makes boiler superheater group's temperature progressively reduce simultaneously.
7. The utility model provides a boiler cooling system, which also comprises; the air feeder is communicated with a hearth air port arranged on the hearth and close to the hearth inlet; the induced draft fan is communicated with the flue at the tail part of the boiler; this application adopts above-mentioned technical scheme, on hydrologic cycle refrigerated basis, through the forced draft cooling, takes away the inside heat of boiler for the inside gradual cooling of boiler.
8. The utility model is provided with a blower moving blade on the blower; the induced draft fan is provided with an induced draft fan movable vane; by adopting the technical scheme, the air supply quantity of the air supply machine can be conveniently adjusted through the movable blades of the air supply machine; through the movable vane of the draught fan, the induced draft of the draught fan is conveniently adjusted.
9. The utility model is provided with a boiler tail smoke movable baffle plate at the position close to the draught fan on the boiler tail flue; above-mentioned technical scheme is adopted in this application, through the aperture of adjusting boiler afterbody flue gas adjustable fender, conveniently adjusts the flue gas flow of boiler afterbody flue, and then adjusts the inside temperature of boiler.
10. The utility model is provided with a chimney at the output end of the draught fan; this application adopts above-mentioned technical scheme, will have inside thermal air discharges the boiler steadily through the chimney.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a boiler cooling system provided in an embodiment of the present invention.
Description of reference numerals:
1. a boiler economizer; 2. a boiler water wall; 3. a first boiler superheater; 4. a second boiler superheater; 5. a third boiler superheater; 6. a first boiler reheater; 7. a second boiler reheater; 8. a third boiler reheater; 9. a fourth boiler reheater; 10. a blower; 11. a furnace tuyere; 12. a hearth; 13. a boiler tail flue; 14. an induced draft fan; 15. a chimney; 16. a blower blade; 17. a movable vane of the induced draft fan; 18. A boiler feed water line; 19. a first electrically powered isolation valve; 20. a bypass regulating valve; 21. a second electrically-operated isolation valve; 22. a main water supply and water feeding electric valve; 23. an economizer inlet duct; 24. a water wall inlet conduit; 25. A steam-water separator; 26. a water tank; 27. a circulation pump; 28. the outlet of the circulating pump is provided with a regulating valve; 29. a superheater dump valve; 30. a water tank level solenoid valve; 31. a third electrically-operated isolation valve; 32. a top outlet pipe; 33. a bottom outlet pipe; 34. cooling the water outlet pipe; 35. a low temperature superheater; 36. a flash tank; 37. a steam exhaust inlet of a high-pressure cylinder of the steam turbine; 38. a superheated steam discharge port; 39. a reheat steam vent; 40. boiler afterbody flue gas adjustable fender.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
One embodiment of a boiler cooling system, as shown in fig. 1, for cooling a boiler interior, the boiler interior comprising: a hearth inlet, a hearth 12 and a boiler tail flue 13 which are communicated in sequence; the boiler cooling system includes: the system comprises a water tank 26, a circulating pump 27, a circulating pump outlet regulating valve 28, a boiler economizer 1, a boiler water cooling wall 2, a steam-water separator 25, a boiler water supply pipeline 18 connected with the boiler economizer 1, a boiler superheater group, a superheater emptying valve 29 and a flash tank 36, a water tank water level electromagnetic valve 30 connected with the water tank 26, a blower 10 and an induced draft fan 14, wherein the water tank, the circulating pump 27, the circulating pump outlet regulating valve 28, the boiler water cooling wall 1, the steam-water separator 25, the boiler water supply pipeline 18, the boiler superheater group, the superheater emptying valve 29 and the flash tank 36 are connected in sequence.
The boiler water-cooled wall 2 is composed of water-cooled pipelines and is arranged on the wall surface in the boiler, the boiler water-cooled wall 2 is provided with a water-cooled wall inlet pipeline 24, and the water-cooled wall inlet pipeline 24 is arranged on the wall surface of the hearth inlet; the input end of the circulating pump 27 is connected with the water tank 26, and the output end of the circulating pump is connected with the economizer inlet pipeline 23 of the boiler economizer 1 through a circulating pump outlet regulating valve 28; the inlet end of the steam-water separator 25 is connected with the boiler water wall 2 through a cooling water outlet pipe 34, and the water outlet end of the steam-water separator 25 is connected with the water tank 26 through a bottom outlet pipe 33. The boiler feed water line 18 is connected to a waterwall inlet line 24 via a boiler feed water adjustment valve set. Specifically, the boiler is gone up water and is adjusted valve group and includes: a first electric isolating valve 19, a bypass regulating valve 20, a second electric isolating valve 21 and a main water supply water electric valve 22 which are connected in sequence; two ends of the main water supply and water supply electric valve 22 are respectively connected with the first electric isolating valve 19 and the second electric isolating valve 21; specifically, the connection is through high-strength welding. The tank level solenoid valve 30 is connected to the tank 26 near the middle by a third electrically-operated isolation valve 31. The boiler superheater group is arranged in the hearth 12, and the steam outlet end of the steam-water separator 25 is connected with the boiler superheater group through a top outlet pipe 32; specifically, the boiler superheater group comprises: the system comprises a first boiler superheater 3, a second boiler superheater 4 and a third boiler superheater 5 which are connected in sequence. When the load of the boiler is less than 30% of the rated load, the steam-water separator 25 plays a role of steam-water separation, the separated steam enters the boiler superheater bank, and the water enters the water tank 26 through the bottom outlet pipe 33. When the boiler load is above 30% of the rated load, the steam-water separator 25 operates in a dry state and is used only as a steam circulation element. A dewatering structure is installed in the steam-water separator 25 to prevent steam from entering the boiler superheater bank with water.
The air feeder 10 is communicated with a hearth air port 11 which is arranged on the hearth 12 and is close to a hearth inlet, specifically, two hearth air ports 11 can be arranged, the air feeder 10 is connected with an air duct through flexible connection, and the air duct is connected with the hearth air ports 11 through flexible connection. The induced draft fan 14 is communicated with a boiler tail flue 13, the boiler tail flue 13 is a double flue, the boiler tail flue 13 is connected with the induced draft fan 14 through flexible connection,
a boiler reheater group and a low-temperature superheater 35 are arranged in the boiler tail flue 13, and the boiler economizer 1 is also arranged in the boiler tail flue 13; the boiler reheat unit includes: a first boiler reheater 6, a second boiler reheater 7, a third boiler reheater 8 and a fourth boiler reheater 9 connected in sequence; the first boiler reheater 6 is connected with the flash tank 36 through a superheater drain valve 29; the fourth boiler reheater 9 is connected to the turbine high-pressure cylinder through a turbine high-pressure cylinder exhaust inlet 37; the first boiler reheater 6 is provided with a reheat steam outlet 39, and the third boiler superheater 5 is provided with a superheated steam outlet 38. The superheated steam output by the boiler enters a high-pressure cylinder of a steam turbine to do work. The steam after doing work is introduced into the fourth boiler reheater 9 through the high-pressure cylinder exhaust pipeline and the steam turbine high-pressure cylinder exhaust inlet 37, the steam is further heated, the steam heated by the boiler reheater group enters the steam turbine intermediate pressure cylinder through the reheated steam outlet 39 to do work.
Further, a blower blade 16 is provided on the blower 10; and the draught fan 14 is provided with a draught fan movable blade 17. A boiler tail smoke movable baffle 40 is arranged on the boiler tail flue 13 and close to the induced draft fan 14. The output end of the induced draft fan 14 is provided with a chimney 15, and specifically, the induced draft fan 14 is connected with the chimney 15 through flexible connection. The boiler tail flue 13 and the air duct are both formed by welding steel plates and are of a rectangular box-shaped structure, so that the boiler tail flue has a good sealing effect and prevents air leakage.
The working process of the boiler cooling system is briefly described as follows: the boiler is not stopped due to the explosion leakage of the boiler superheater group. With the boiler flameout, the steam-water circulation pressure is gradually reduced, and the continuous operation of the circulation pump 27 is maintained; water is powered by a circulating pump 27 from a water tank 26, and is collected with water in a boiler water supply pipeline 18 to an economizer inlet pipeline 23 to enter a boiler economizer 1, the water enters a boiler water-cooling wall 2 after passing through the boiler economizer 1, and after heat exchange, the boiler water-cooling wall 2 enters a steam-water separator 25 through a cooling water outlet pipe 34. The steam-water separator 25 plays a role in steam-water separation, separated water enters the water tank 26 and participates in water circulation again, and steam enters the boiler superheater group to cool the boiler superheater group. The water circulation flow is controlled by the circulating pump outlet regulating valve 28, so that the temperature drop rate of the heating surface in the boiler is qualified. Water in the water circulation part is vaporized and enters a boiler superheater bank, and then is discharged into a flash tank 36 through a superheater emptying valve 29 for recovery. The rate of temperature drop of the boiler superheater bank is also controlled by the outlet flow of the circulation pump 27. Because the water in the water circulation part enters the steam part after being vaporized, the water level in the water tank 26 is gradually reduced, and water can be supplemented through a boiler water feeding adjusting valve group on the boiler water feeding pipeline 18; to prevent water ingress in the boiler superheater bank when the water level in the tank 26 is too high, water may be drained out of the tank 26 through a tank level solenoid valve 30. After the boiler is flamed out, related baffles such as a blower movable blade 16 and an induced draft fan movable blade 17 are opened, so that the hearth 12 of the boiler is cooled by natural ventilation, and the cooling speed of the boiler water wall 2 does not exceed the design allowable value of the boiler: 0.25 deg.C/min. When the outlet steam pressure of the steam-water separator 25 is reduced to below 0.8MPa and the outlet temperature is lower than 180 ℃, the boiler does not discharge hot furnace water, the circulating pump 27 is kept to continuously operate, and water is continuously changed for cooling. The pressure of the steam-water separator 25 is continuously reduced to 0.2MPa, and a superheater emptying valve 29 is opened; and after the boiler is flamed out for eight hours, starting the blower 10 and the induced draft fan 14, keeping the required air volume, and forcibly ventilating and cooling, wherein the air volume is specifically adjusted through the opening degrees of the blower movable blade 16 and the induced draft fan movable blade 17. The water level of the water tank 26 is maintained to be stable through the boiler water feeding regulating valve group and the water tank water level electromagnetic valve 30, the circulating pump 27 is kept to run, and forced ventilation cooling is matched until people can enter the boiler. In the process of combined cooling, the monitoring of the wall temperature of the heat exchange surface is enhanced, the design cooling rate of the boiler is met, and particularly, the cooling speed of the boiler water wall 2 is not more than 0.5 ℃/min.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A boiler cooling system for cooling the interior of a boiler, said boiler interior comprising: furnace entry, furnace (12) and boiler tail flue (13) that communicate in proper order, its characterized in that includes:
the boiler water-cooled wall (2) consists of water-cooled pipelines and is arranged on the wall surface in the boiler, the boiler water-cooled wall (2) is provided with a water-cooled wall inlet pipeline (24), and the water-cooled wall inlet pipeline (24) is arranged on the wall surface of the hearth inlet;
a water tank (26);
the input end of the circulating pump (27) is connected with the water tank (26), and the output end of the circulating pump is connected with the water wall inlet pipeline (24);
the inlet end of the steam-water separator (25) is connected with the boiler water wall (2) through a cooling water outlet pipe (34), and the water outlet end of the steam-water separator (25) is connected with the water tank (26).
2. The boiler cooling system according to claim 1, further comprising:
and the boiler water supply pipeline (18) is connected with a water wall inlet pipeline (24) through a boiler water supply adjusting valve group.
3. The boiler cooling system according to claim 2, wherein the boiler feedwater regulating valve set comprises:
the first electric isolating valve (19), the bypass regulating valve (20) and the second electric isolating valve (21) are connected in sequence;
and two ends of the main water supply and feeding electric valve (22) are respectively connected with the first electric isolating valve (19) and the second electric isolating valve (21).
4. The boiler cooling system according to claim 2, further comprising:
and the water tank water level electromagnetic valve (30) is connected with the position, close to the middle, on the water tank (26).
5. The boiler cooling system according to claim 1, further comprising: and a circulating pump outlet regulating valve (28) arranged between the circulating pump (27) and the water wall inlet pipeline (24).
6. The boiler cooling system according to any one of claims 1 to 5, further comprising:
the boiler superheater group is arranged in the hearth (12) and is connected with the steam outlet end of the steam-water separator (25); the boiler superheater bank is connected with a flash tank (36) through a superheater exhaust valve (29).
7. The boiler cooling system according to any one of claims 1 to 5, further comprising;
the blower (10) is communicated with a hearth tuyere (11) arranged on the hearth (12) and close to the hearth inlet;
and the induced draft fan (14) is communicated with the boiler tail flue (13).
8. The boiler cooling system according to claim 7, wherein a blower blade (16) is provided on the blower (10); and the draught fan (14) is provided with a draught fan movable blade (17).
9. The boiler cooling system according to claim 7, characterized in that a boiler tail flue gas flap (40) is provided on the boiler tail flue (13) near the induced draft fan (14).
10. A boiler cooling system according to claim 7, characterized in that a chimney (15) is provided at the output of the induced draft fan (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222888183.8U CN218544506U (en) | 2022-10-31 | 2022-10-31 | Boiler cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222888183.8U CN218544506U (en) | 2022-10-31 | 2022-10-31 | Boiler cooling system |
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| Publication Number | Publication Date |
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| CN218544506U true CN218544506U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222888183.8U Active CN218544506U (en) | 2022-10-31 | 2022-10-31 | Boiler cooling system |
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| Country | Link |
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| CN (1) | CN218544506U (en) |
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2022
- 2022-10-31 CN CN202222888183.8U patent/CN218544506U/en active Active
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