CN214274509U - Cut jar and reform transform project heat supply governing valve and cut jar system of reforming transform - Google Patents
Cut jar and reform transform project heat supply governing valve and cut jar system of reforming transform Download PDFInfo
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- CN214274509U CN214274509U CN202022924818.6U CN202022924818U CN214274509U CN 214274509 U CN214274509 U CN 214274509U CN 202022924818 U CN202022924818 U CN 202022924818U CN 214274509 U CN214274509 U CN 214274509U
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Abstract
A cylinder cutting modification project heat supply regulating valve and a cylinder cutting modification system comprising the same are provided, wherein the cylinder cutting modification project heat supply regulating valve is provided with a hydraulic adjusting actuating mechanism, a butterfly valve unit and a connecting unit for connecting the hydraulic adjusting actuating mechanism and the butterfly valve unit; the hydraulic adjusting actuating mechanism is provided with a double-acting oil cylinder and comprises a hydraulic switch and a spring; the hydraulic switch comprises a piston rod, an oil cylinder, a piston, an end cover and a control valve block; the control valve block can control a valve to be in a closed state, a normal opening state and a quick opening state; when the valve is in the closed state, the rodless cavity of the oil cylinder is filled with oil, and the spring is compressed to enable the spring to continue to have elastic restoring force; when the valve is in a normal opening state or a quick opening state, the oil enters the rod cavity of the oil cylinder, and the elastic restoring force is released by the spring. By means of the cylinder cutting modification project heat supply regulating valve, the cylinder cutting modification project heat supply regulating valve can be opened quickly and reliably under the condition of failure.
Description
Technical Field
The utility model relates to an on-off and regulation steam medium's governing valve especially cut jar and reform transform project heat supply governing valve and cut jar transformation system.
Background
The national energy agency formally starts flexible modification demonstration test point items in 2016, 6 months and 14 days, and issues a first test point item list and a second test point item list of thermal power flexible modification (also called cylinder switching modification) in 6 months, 28 days and 8 months, 5 days. Thermal power flexibility has become a hot topic. Therefore, the western's institute of thermal engineering proposes a low-pressure cylinder zero-output technology, which is also called a low-pressure cylinder cut-off steam-in heating technology, a cylinder cut-off heating technology, and the like, and improves the flexibility of the heat supply unit. The core of the low-pressure cylinder zero-output technology is that only a small amount of cooling steam is reserved to enter the low-pressure cylinder, 3000-turn zero-output operation of a low-pressure rotor is achieved, more steam enters a heat supply system, the heat supply capacity is improved, the electric load is reduced, and meanwhile, the coal consumption for power generation is reduced.
In the project of cylinder cutting transformation, the on-off and the adjustment of steam media between the communication pipes of the intermediate pressure cylinder and the low pressure cylinder of the steam turbine are particularly important links. Before a cylinder is not cut, a butterfly valve with an annular gap at the middle line is generally used as a component for realizing the on-off and flow control of a pipeline system in a power plant, so that the minimum flow is ensured. However, due to the structural feature limitations, the existing center line butterfly valve does not meet the cylinder-cutting zero-leakage requirement. How to carry out the product of design development to steam turbine cut jar transformation specially, both guarantee to close zero leakage entirely, guarantee to open fast and reliably under the trouble condition also becomes the technological problem that this field needs a urgent need to solve.
Disclosure of Invention
An object of the utility model is to provide a jar of cutting that can be reliable and fast opens reforms transform project heat supply governing valve.
The utility model provides a technical scheme that its technical problem adopted is: a cylinder cutting modification project heat supply regulating valve is provided with a hydraulic adjusting executing mechanism, a butterfly valve unit and a connecting unit for connecting the hydraulic adjusting executing mechanism and the butterfly valve unit;
the hydraulic adjusting actuating mechanism is provided with a double-acting oil cylinder and comprises a hydraulic switch and a spring; the hydraulic switch comprises a piston rod, an oil cylinder, a piston, an end cover and a control valve block;
the second end of the piston rod, which is arranged in the oil cylinder, is connected with the piston;
the end cover and the oil cylinder jointly define a rod cavity for the piston rod to displace, and the piston rod and the piston can displace in the rod cavity; the control valve block is arranged on one side, far away from the piston, of the end cover and can be connected with the rod cavity of the oil cylinder and the rodless cavity of the oil cylinder;
the control valve block can control a valve to be in a closed state, a normal opening state and a quick opening state; when the valve is in the closed state, the rodless cavity of the oil cylinder is filled with oil, and the spring is compressed to accumulate elastic restoring force; when the valve is located in the normal opening state or the quick opening state, the oil enters the rod cavity of the oil cylinder, and the elastic restoring force is released by the spring.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the hydraulic switch further comprises a linear displacement sensor arranged outside the oil cylinder and a support with the extending direction consistent with the displacement direction of the piston rod, the piston rod can be connected with a rack, and the piston rod and the piston can linearly displace in the rod cavity.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the bracket has a first displacement space for displacement of the piston rod, and the piston rod further has a first end disposed in the first displacement space of the bracket.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the butterfly valve unit comprises a three-eccentric metal sealing butterfly valve; the triple eccentric metal seal butterfly valve comprises a butterfly plate with a sealing surface, a valve rod and a valve body, wherein an eccentricity A exists between the sealing surface of the butterfly plate and the center of the valve body, an eccentricity B and an inclined cone eccentric angle C exist between the rotation center of the valve rod and the center of the valve body, the eccentricity A is 96mm, the eccentricity B is 16mm, and the inclined cone eccentric angle C is 9 degrees.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the butterfly valve unit comprises a three-eccentric metal sealing butterfly valve; the triple-eccentric metal seal butterfly valve comprises a butterfly plate with a sealing surface, a valve rod and a valve body, wherein an eccentricity A exists between the sealing surface of the butterfly plate and the center of the valve body, an eccentricity B and an inclined cone eccentric angle C exist between the rotation center of the valve rod and the center of the valve body, the eccentricity A is 100mm, the eccentricity B is 18mm, and the inclined cone eccentric angle C is 7.5 degrees.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the caliber of the three-eccentric metal sealing butterfly valve is DN1200 or DN 1400.
The utility model discloses a cut jar and reform transform project heat supply governing valve further sets up to: the spring is a spiral spring arranged in the oil cylinder, and the spring is sleeved outside the piston rod; the hydraulic switch is also provided with a buffer piece for preventing the piston rod from moving beyond a preset position; the end cap has a recess corresponding to the protruding portion of the piston.
The utility model also provides a cylinder cutting reconstruction system, which comprises a pressure gauge, the cylinder cutting reconstruction project heat supply regulating valve, the first cartridge valve, the second cartridge valve, the electromagnetic valve, the superposed hydraulic control one-way valve and the proportional valve; the electromagnetic valve is provided with an A end, a P end and a T end; the proportional valve is provided with an A end, a B end, a P end and a T end;
the cylinder cutting modification system is provided with an oil inlet for pressure oil to enter and an oil return port for pressure oil to return; the pressure gauge, the first cartridge valve, the P end of the electromagnetic valve and the P end of the proportional valve are communicated with the oil inlet, and the T end of the proportional valve and the second cartridge valve are communicated with the oil return port; the end A of the electromagnetic valve is communicated with the first cartridge valve and the second cartridge valve; the end A of the proportional valve and the end B of the proportional valve are respectively communicated with two left side ports of the overlapped hydraulic control one-way valve; and the first right ports of the first cartridge valve and the superposed hydraulic control one-way valve are communicated with the D cavity of the cylinder cutting modification project heat supply regulating valve, and the second right ports of the second cartridge valve and the superposed hydraulic control one-way valve are communicated with the D cavity of the cylinder cutting modification project heat supply regulating valve.
The utility model discloses a cut jar transformation system and further set up to: when the electromagnetic valve is electrified, pressure oil passes through the electromagnetic valve from the oil inlet to control cavities of the first cartridge valve and the second cartridge valve, and when the first cartridge valve and the second cartridge valve are closed, the opening and closing of the valve or a valve position adjusting and controlling function can be performed; when the proportional valve receives a valve opening signal, an oil inlet passage in the proportional valve is communicated, pressure oil enters a cavity D of the oil cylinder through the proportional valve, oil in the cavity D of the oil cylinder returns to an EH oil tank, the piston works at the moment, and the valve is opened; when the proportional valve receives a valve closing signal, pressure oil enters a D cavity of the oil cylinder through the proportional valve, oil in the D cavity of the oil cylinder returns to the EH oil tank, the piston works at the moment, and the valve is closed; when the proportional valve receives a valve position instruction signal, an oil inlet passage is opened or closed, so that a valve position adjusting control function is realized; when the electromagnetic valve is powered off, the first cartridge valve and the second cartridge valve are opened, and oil is quickly drained from the oil cylinder through the second cartridge valve and returns to the EH oil tank.
The utility model discloses a cut jar transformation system and further set up to: the electromagnetic valve is an electromagnetic ball valve; the pressure gauge is controlled to be opened or closed by a pressure gauge switch.
The beneficial effects of the utility model reside in that: by means of the cylinder cutting modification project heat supply regulating valve, the cylinder cutting modification project heat supply regulating valve can be opened quickly and reliably under the condition of failure.
Drawings
Fig. 1 is a schematic side view schematically illustrating the relationship between the main components and the relative positions of the heat regulating valve for the cylinder cutting modification project of the present invention.
Fig. 2 is a schematic sectional view schematically illustrating the main components and the relative position relationship of the hydraulic adjusting actuator of the heat supply adjusting valve for the cylinder cutting modification project according to the present invention.
Fig. 3 is a schematic partial cross-sectional view schematically illustrating the eccentricity between the sealing surface of the butterfly plate of the butterfly valve unit of the cylinder cutting modification project heat supply regulating valve and the center of the valve body, the eccentricity existing in the rotation center of the valve rod relative to the center of the valve body, and the oblique cone eccentric angle.
Fig. 4 is a schematic diagram schematically illustrating the main elements and connections of the cylinder cutting reforming system of the present invention.
Detailed Description
In the following description, similar elements are denoted by the same reference numerals, and directional terms such as "front", "rear", "upper", "lower", "left", "right", and the like are merely used to illustrate relative positional relationships between the elements, and the technical scope of the present invention is not limited thereto.
As shown in figure 1, the utility model discloses cut jar transformation project heat supply governing valve has the regulating actuator 1 that surges, butterfly valve unit 2 and connects the regulating actuator 1 that surges and the linkage unit 3 of butterfly valve unit 2.
As shown in fig. 2, the hydraulic adjusting actuator 1 has a double-acting cylinder, including a hydraulic switch 11, and a spring. The hydraulic switch 11 includes a linear displacement sensor 111, a bracket 112, a piston rod 113, a cylinder 114, a piston 115, an end cover 116, and a control valve block 117. In some embodiments, the spring is a coil spring disposed inside the cylinder 114, and in some alternative embodiments, the spring is sleeved outside the piston rod 113.
The linear displacement sensor 111 is disposed outside the cylinder 114 to detect whether the piston rod 113 disposed inside the cylinder 114 is displaced in a linear direction.
The extension direction of the bracket 112 coincides with the displacement direction of the piston rod 113 and has a first displacement space for the piston rod 113 to displace. In some alternative embodiments, the bracket 112 further has a buffer member therein for preventing the piston rod 113 from being displaced beyond a predetermined position. In some alternative embodiments, the first displacement space is in communication with the rodless chamber of the cylinder 114.
The piston rod 113 has a first end disposed in the first displacement space of the bracket 112, and a second end disposed in the cylinder 114. The second end of the piston rod 113 is connected to the piston 115. In some alternative embodiments, the piston rod 113 can be coupled to a rack to facilitate linear displacement of the piston rod 113.
The end cap 116 and the cylinder 114 define a rod chamber for displacing the piston rod 113, and the piston rod 113 and the piston 115 can be linearly displaced in the rod chamber. In some alternative embodiments, the end cap 116 has a groove corresponding to the protruding portion of the piston 115, so as to be detected by the linear displacement sensor 111 and inform a service person to perform maintenance when the piston rod 113 and the piston 115 are not linearly displaced in the second displacement space.
The control valve block 117 is disposed on a side of the end cap 116 away from the piston 115 and is capable of connecting the rod chamber and the rodless chamber of the cylinder 114.
The control valve block 117 is capable of controlling the valve to be in a closed state, a normal open state and a quick open state. When the valve is in the closed state, the rodless chamber of the cylinder 114 is filled with oil and compresses the spring to accumulate an elastic restoring force. When the valve is in the normal open state or the quick open state, the rod chamber of the cylinder 114 is filled with oil, and the spring releases the elastic restoring force.
The butterfly valve unit 2 includes a triple eccentric metal seal butterfly valve 21. As shown in fig. 3, the illustrated triple offset metal seal butterfly valve 21 includes a butterfly plate having a seal surface with an eccentricity a from the center of the valve body, a valve stem having an eccentricity B and an oblique cone eccentricity angle C from the center of the valve stem with respect to the center of the valve body, and a valve body. Three eccentric metal seal butterfly valves 21 generally are for opening the valve fast, are located the quick state of opening in order to make aforementioned valve the utility model discloses in key optimize three eccentric parameter, work as promptly the eccentricity is 96mm apart from A (sealed high off-centre) the eccentricity is 16mm apart from B (valve rod off-centre) and when oblique awl eccentric angle C (angle off-centre) was 9 degrees, or the eccentricity is 100mm apart from A (sealed high off-centre) the eccentricity is 18mm apart from B (valve rod off-centre) and when oblique awl eccentric angle C (angle off-centre) was 7.5 degrees, can reduce the opening moment of valve on guaranteeing valve seal's basis to guarantee to cut the sealed of jar operating mode. In specific implementation, the three-eccentric metal seal butterfly valve 21 may have two calibers: DN1200, DN 1400.
The utility model discloses cut jar transformation system includes that manometer 01, the aforesaid cut jar and reform transform project heat supply governing valve, first cartridge valve 02, second cartridge valve 03, solenoid valve 8, stack formula liquid accuse check valve 04 and proportional valve 05. In some alternative embodiments, the solenoid valve 8 may be a solenoid ball valve. In some alternative embodiments, the pressure gauge 01 can be turned on or off by a pressure gauge switch.
The solenoid valve 8 has an end A, an end P and an end T. The proportional valve 05 has an A-end, a B-end, a P-end, and a T-end.
The utility model discloses cut jar transformation system and have oil inlet P that supplies pressure oil to get into and supply the oil return opening T of pressure oil return. The pressure gauge 01, the first cartridge valve 02, the P end of the electromagnetic valve 8 and the P end of the proportional valve 05 are communicated with the oil inlet P, and the T end of the proportional valve 05 and the second cartridge valve 03 are communicated with the oil return port T. The end A of the electromagnetic valve 8 is communicated with the first cartridge valve 02 and the second cartridge valve 03. The end A of the proportional valve 05 and the end B of the proportional valve 05 are respectively communicated with the two left side ports of the superposition type hydraulic control one-way valve 04. The first cartridge valve 02 and a first right port of the superposition type hydraulic control one-way valve 04 are communicated with a cavity D of the cylinder cutting modification project heat supply regulating valve, and the second cartridge valve 03 and a second right port of the superposition type hydraulic control one-way valve 04 are communicated with a cavity D of the cylinder cutting modification project heat supply regulating valve.
When the cylinder cutting modification system is in a normal opening state and a closing state, the electromagnetic valve 8 is electrified, pressure oil passes through the electromagnetic valve 8 through an oil inlet P to control cavities of the first cartridge valve 02 and the second cartridge valve 03, and when the first cartridge valve 02 and the second cartridge valve 03 are closed, the valves can be opened and closed; when the proportional valve 05 receives a valve opening signal, an oil inlet passage inside the proportional valve 05 is communicated, pressure oil enters an opening cavity (cavity D) of the oil cylinder 114 through the proportional valve 05, and oil in the other cavity (cavity D) of the oil cylinder 114 returns to an EH oil tank. At this time, the piston 115 is operated, and the valve is opened; when the proportional valve 05 receives a valve closing signal, pressure oil enters a closed cavity (cavity D) of the oil cylinder 114 through the proportional valve 05, and oil in the other cavity (cavity D) of the oil cylinder 114 returns to an EH oil tank. At this point the piston 115 is operating and the valve is closed.
In any position of the cylinder cutting reconstruction system, as long as a quick opening or emergency quick opening button on a control panel of an electric cabinet is pressed, the electromagnetic valve 8 in the system loses power, so that the first cartridge valve 02 and the second cartridge valve 03 of a main oil path are opened, and oil is quickly discharged from the oil cylinder 114 through the second cartridge valve 03 and returns to an EH oil tank. At this time, the oil flow rate through the second cartridge valve 03 is large, and the quick opening can be ensured by the spring.
In addition, the cylinder cutting modification system of the utility model has an adjusting function, that is, when the solenoid valve 8 is powered on, pressure oil passes through the solenoid valve 8 to the control cavity of the first cartridge valve 02 and the second cartridge valve 03 through the oil inlet P, and the first cartridge valve 02 and the second cartridge valve 03 are both closed; the proportional valve 05 receives a valve position instruction signal, and an oil inlet (oil return) passage is connected or disconnected, so that a valve position adjusting control function can be realized.
The above description is only a preferred embodiment of the present invention, and the technical scope of the present invention is not limited thereto, but the simple equivalent changes made according to the claims and the description of the present invention are all within the scope of the present invention.
Claims (10)
1. A cylinder cutting modification project heat supply regulating valve; the method is characterized in that: the cylinder cutting modification project heat supply regulating valve is provided with a hydraulic adjusting executing mechanism, a butterfly valve unit and a connecting unit for connecting the hydraulic adjusting executing mechanism and the butterfly valve unit;
the hydraulic adjusting actuating mechanism is provided with a double-acting oil cylinder and comprises a hydraulic switch and a spring; the hydraulic switch comprises a piston rod, an oil cylinder, a piston, an end cover and a control valve block;
the second end of the piston rod, which is arranged in the oil cylinder, is connected with the piston;
the end cover and the oil cylinder jointly define a rod cavity for the piston rod to displace, and the piston rod and the piston can displace in the rod cavity; the control valve block is arranged on one side, far away from the piston, of the end cover and can be connected with the rod cavity of the oil cylinder and the rodless cavity of the oil cylinder;
the control valve block can control a valve to be in a closed state, a normal opening state and a quick opening state; when the valve is in the closed state, the rodless cavity of the oil cylinder is filled with oil, and the spring is compressed to accumulate elastic restoring force; when the valve is located in the normal opening state or the quick opening state, the oil enters the rod cavity of the oil cylinder, and the elastic restoring force is released by the spring.
2. A cylinder cut retrofit project heat supply regulator valve as defined in claim 1, wherein: the hydraulic switch further comprises a linear displacement sensor arranged outside the oil cylinder and a support with the extending direction consistent with the displacement direction of the piston rod, the piston rod can be connected with a rack, and the piston rod and the piston can linearly displace in the rod cavity.
3. A cylinder cut retrofit project heat supply regulator valve as defined in claim 2, wherein: the bracket has a first displacement space for displacement of the piston rod, and the piston rod further has a first end disposed in the first displacement space of the bracket.
4. A cylinder cut retrofit project heat supply regulator valve as defined in claim 1, wherein: the butterfly valve unit comprises a three-eccentric metal sealing butterfly valve; the triple eccentric metal seal butterfly valve comprises a butterfly plate with a sealing surface, a valve rod and a valve body, wherein an eccentricity A exists between the sealing surface of the butterfly plate and the center of the valve body, an eccentricity B and an inclined cone eccentric angle C exist between the rotation center of the valve rod and the center of the valve body, the eccentricity A is 96mm, the eccentricity B is 16mm, and the inclined cone eccentric angle C is 9 degrees.
5. A cylinder cut retrofit project heat supply regulator valve as defined in claim 1, wherein: the butterfly valve unit comprises a three-eccentric metal sealing butterfly valve; the triple-eccentric metal seal butterfly valve comprises a butterfly plate with a sealing surface, a valve rod and a valve body, wherein an eccentricity A exists between the sealing surface of the butterfly plate and the center of the valve body, an eccentricity B and an inclined cone eccentric angle C exist between the rotation center of the valve rod and the center of the valve body, the eccentricity A is 100mm, the eccentricity B is 18mm, and the inclined cone eccentric angle C is 7.5 degrees.
6. A cylinder cut retrofit project heat supply regulator valve as defined in claim 4, wherein: the caliber of the three-eccentric metal sealing butterfly valve is DN1200 or DN 1400.
7. A cylinder cut modification project heat supply adjustment valve as defined in any one of claims 1 to 6, wherein: the spring is a spiral spring arranged in the oil cylinder, and the spring is sleeved outside the piston rod; the hydraulic switch is also provided with a buffer piece for preventing the piston rod from moving beyond a preset position; the end cap has a recess corresponding to the protruding portion of the piston.
8. The utility model provides a cut jar transformation system which characterized in that: the cylinder cutting modification system comprises a pressure gauge, the cylinder cutting modification project heat supply regulating valve as claimed in any one of claims 1 to 6, a first cartridge valve, a second cartridge valve, an electromagnetic valve, a superposed hydraulic control one-way valve and a proportional valve; the electromagnetic valve is provided with an A end, a P end and a T end; the proportional valve is provided with an A end, a B end, a P end and a T end;
the cylinder cutting modification system is provided with an oil inlet for pressure oil to enter and an oil return port for pressure oil to return; the pressure gauge, the first cartridge valve, the P end of the electromagnetic valve and the P end of the proportional valve are communicated with the oil inlet, and the T end of the proportional valve and the second cartridge valve are communicated with the oil return port; the end A of the electromagnetic valve is communicated with the first cartridge valve and the second cartridge valve; the end A of the proportional valve and the end B of the proportional valve are respectively communicated with two left side ports of the overlapped hydraulic control one-way valve; and a first right port of the superposed hydraulic control one-way valve and the first cartridge valve are communicated with a cavity D of the cylinder cutting modification project heat supply regulating valve, and a second right port of the superposed hydraulic control one-way valve and the second cartridge valve are communicated with a cavity D of the cylinder cutting modification project heat supply regulating valve.
9. The cylinder cutting modification system of claim 8, wherein: when the electromagnetic valve is electrified, pressure oil passes through the electromagnetic valve from the oil inlet to control cavities of the first cartridge valve and the second cartridge valve, and when the first cartridge valve and the second cartridge valve are closed, the valve can be opened and closed or a valve position adjusting and controlling function can be performed: when the proportional valve receives a valve opening signal, an oil inlet passage in the proportional valve is communicated, pressure oil enters a cavity D of the oil cylinder through the proportional valve, oil in the cavity D of the oil cylinder returns to an EH oil tank, the piston works at the moment, and the valve is opened; when the proportional valve receives a valve closing signal, pressure oil enters a D cavity of the oil cylinder through the proportional valve, oil in the D cavity of the oil cylinder returns to the EH oil tank, the piston works at the moment, and the valve is closed; when the proportional valve receives a valve position instruction signal, an oil inlet passage is opened or closed, so that a valve position adjusting control function is realized; when the electromagnetic valve is powered off, the first cartridge valve and the second cartridge valve are opened, and oil is quickly drained from the oil cylinder through the second cartridge valve and returns to the EH oil tank.
10. The cylinder cutting modification system of claim 8, wherein: the electromagnetic valve is an electromagnetic ball valve; the pressure gauge is controlled to be opened or closed by a pressure gauge switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022924818.6U CN214274509U (en) | 2020-12-09 | 2020-12-09 | Cut jar and reform transform project heat supply governing valve and cut jar system of reforming transform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022924818.6U CN214274509U (en) | 2020-12-09 | 2020-12-09 | Cut jar and reform transform project heat supply governing valve and cut jar system of reforming transform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214274509U true CN214274509U (en) | 2021-09-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022924818.6U Active CN214274509U (en) | 2020-12-09 | 2020-12-09 | Cut jar and reform transform project heat supply governing valve and cut jar system of reforming transform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214274509U (en) |
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2020
- 2020-12-09 CN CN202022924818.6U patent/CN214274509U/en active Active
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