CN220492698U - Magnetic levitation motor kinetic energy feedback variable frequency driving system structure for central air conditioner - Google Patents
Magnetic levitation motor kinetic energy feedback variable frequency driving system structure for central air conditioner Download PDFInfo
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- CN220492698U CN220492698U CN202322060866.9U CN202322060866U CN220492698U CN 220492698 U CN220492698 U CN 220492698U CN 202322060866 U CN202322060866 U CN 202322060866U CN 220492698 U CN220492698 U CN 220492698U
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Abstract
The utility model belongs to the technical field of components of an air conditioner variable frequency driving system, and particularly relates to a structure of a magnetic suspension motor kinetic energy feedback variable frequency driving system for a central air conditioner. The IPS power supply is directly connected with the bus copper bar to obtain electricity, so that the design of a power supply switching device and a transformer in a traditional driving system is replaced, the equipment cost is reduced, the connection and arrangement of each module are compact, and the arrangement space is saved; an energy feedback path is formed by the IPS power supply, the rectifying module, the energy storage module, the inversion module and the motor, when the voltage of the commercial power is interrupted, the motor enters a generator state, direct current is reversely conveyed to the energy storage link by the inversion module, electric energy feedback after power failure of the power grid is realized, and the energy utilization rate of the variable-frequency driving system is improved; the electric energy provided by the energy feedback path is matched with the energy storage module and the IPS power supply, so that the magnetic bearing can be stably supplied with power, the bearing can be kept in suspension until the rotating speed of the magnetic suspension motor is reduced to a safe range and then falls down, and the system safety is high.
Description
Technical Field
The utility model belongs to the technical field of components of an air conditioner variable frequency driving system, and particularly relates to a structure of a magnetic suspension motor kinetic energy feedback variable frequency driving system for a central air conditioner.
Background
In order to save energy and reduce emission, the central air conditioner increasingly tends to change frequency, and the magnetic levitation permanent magnet synchronous motor is increasingly applied to the central air conditioner industry. The current magnetic suspension motor for the central air conditioner on the market can meet the condition of voltage interruption in the driving process, when the voltage is interrupted, the magnetic bearing can lose supporting force under the high-speed running condition and drop onto the protection bearing, so that the magnetic suspension motor is damaged, and the service life is seriously influenced.
The variable frequency driving system structure in the prior art mainly comprises: the power supply system comprises a transformer, a rectifying module, a BOOST module (when a power supply is interrupted, a motor enters a power generation state, the voltage is rapidly reduced, so that the BOOST module is adopted to BOOST), a power supply switching module (when three-phase alternating current of the mains supply is interrupted, the switching module is switched to be supplied with power by motor side rectification), a frequency converter and a motor; the variable frequency driving system in the prior art lacks an energy storage link after a rectifying link, and the electric quantity generated by the sudden power failure of the motor entering a power generation state is insufficient to support the speed of the magnetic suspension motor to be reduced to a safe rotating speed and fall down; and two sets of transformer equipment are required to be configured, so that the overall cost is high, and the occupied area is large.
Disclosure of Invention
The utility model aims to solve the technical problems that: aiming at the defects of the prior art, the magnetic levitation motor kinetic energy feedback variable frequency driving system structure for the central air conditioner is provided, the energy utilization rate is high, the arrangement cost is low, the structure is compact, and the arrangement space can be saved.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
the utility model provides a magnetic suspension motor kinetic energy repayment variable frequency drive system structure for central air conditioning, includes circuit breaker, reactor, rectifier module, energy storage module, contravariant module and IPS power, the input of circuit breaker links to each other with the commercial power electric wire netting, and the output links to each other with the power input terminal in the rectifier module through the reactor; the direct current output positive terminal and the direct current output negative terminal in the rectifying module are respectively connected with the positive electrode and the negative electrode of the energy storage module; the positive electrode and the negative electrode of the energy storage module are respectively connected with a direct current positive electrode input terminal and a direct current negative electrode input terminal in the inversion module; an alternating current output terminal in the inversion module is connected with a motor stator in the magnetic suspension motor; the positive electrode input end and the negative electrode input end of the IPS power supply are respectively connected with the positive electrode and the negative electrode of the energy storage module, and the output end of the IPS power supply is connected with a displacement controller in the magnetic suspension motor;
the rectification module and the inversion module are electrically connected with the control board.
Preferably, the rectifying module comprises a plurality of thyristors which are arranged in parallel, and a gate electrode driving interface of each thyristor is connected with the thyristor driving plate.
Preferably, the energy storage module comprises a plurality of energy storage capacitors which are arranged in series, and each energy storage capacitor is provided with a voltage equalizing resistor in parallel.
Preferably, the inversion module comprises a plurality of IGBT modules which are arranged in parallel, each IGBT module is provided with a corresponding absorption capacitor in parallel, the IGBT driving interface of each IGBT module is connected with a corresponding IGBT driving board, and the alternating current output terminal of each IGBT module is connected with a corresponding Hall sensor.
Preferably, a magnetic suspension bearing, an electronic rotor, an electronic stator, a displacement controller and a displacement sensor are arranged in the magnetic suspension motor, the electronic stator is electrically connected with an alternating current output terminal in the inversion module, and the magnetic suspension bearing is electrically connected with the output end of the IPS power supply through the displacement controller.
Preferably, the power input terminal of each thyristor is connected with the output terminal corresponding to the reactor, the direct current output positive terminal of each thyristor is connected with the positive electrode of the energy storage module, and the direct current output negative terminal of each thyristor is connected with the negative electrode of the energy storage module.
Preferably, the direct current positive electrode input terminal of each IGBT module is connected with the positive electrode of the energy storage module, and the direct current negative electrode input terminal of each IGBT module is connected with the negative electrode of the energy storage module; the absorption capacitor is connected between the direct current positive electrode input terminal and the direct current negative electrode input terminal of the corresponding IGBT module in a bridging mode.
Preferably, the rectifying module is electrically connected with terminals corresponding to the reactor and the energy storage module respectively through copper bars, and the energy storage module is electrically connected with terminals corresponding to the inversion module through copper bars.
Preferably, the IPS power supply is electrically connected to terminals corresponding to the energy storage module and the magnetic levitation motor respectively through power lines.
Preferably, the control board is electrically connected with the thyristor driving board in the rectifying module and the plurality of IGBT driving boards in the inverting module through signal wires.
Compared with the prior art, the utility model has the following main advantages:
1. the IPS power supply is matched with the energy storage module, and is directly connected with the bus copper bar to obtain electricity through the IPS power supply, so that the design of a power supply switching device and a transformer in a traditional driving system is replaced, the equipment cost is reduced, the modules are compactly connected and arranged, the whole volume is reduced, and the arrangement space is saved;
2. an energy feedback path is formed by the IPS power supply, the rectifying module, the energy storage module, the inversion module and the motor, when the voltage of the commercial power is interrupted, the motor enters a generator state, direct current is reversely conveyed to the energy storage link by the inversion module, electric energy feedback after power failure of the power grid is realized, and the energy utilization rate of the variable-frequency driving system is improved;
3. the electric energy provided by the energy feedback path is combined with the energy storage module and the IPS power supply, so that the magnetic bearing can be stably supplied with power, the bearing can be kept in suspension until the rotating speed of the magnetic suspension motor is reduced to a safe range and then falls down, and the system safety is high.
Drawings
FIG. 1 is a schematic diagram of a structure of a magnetic levitation motor kinetic energy feedback variable frequency driving system for a central air conditioner;
FIG. 2 is a schematic circuit diagram of a variable frequency drive system according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a thyristor in an embodiment of the utility model;
fig. 4 is a schematic diagram of an IGBT module according to an embodiment of the utility model;
FIG. 5 is a schematic diagram of an internal topology of an IPS power supply according to an embodiment of the present utility model;
fig. 6 is a schematic diagram of connection of a control board main chip in an embodiment of the utility model.
In the figure: 1. a circuit breaker (QF 1); 2. a reactor (L); 3. a thyristor drive board; 4. thyristors (RBR 1, RBS1, RBT 1); 5. energy storage capacitors (C1-CN); 6. RVS equalizing resistance; 7. an IGBT drive board (IUQ, IVQ, IWQ); 8. IGBT modules (IU, IV, IW); 9. a hall sensor (UCT, VCT, WCT); 10. an absorption capacitance (IUC, IVC, IWC); 11. a control board; 12. a copper bar; 13. a signal line; 14. an IPS power supply; 15. a power line; 16. a utility power grid; 17. a magnetic levitation motor (PM 01); 100. a rectifying module; 200. an energy storage module; 300. and an inversion module.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
It should be noted that each step/component described in the present application may be split into more steps/components, or two or more steps/components or part of the operations of the steps/components may be combined into new steps/components, as needed for implementation, to achieve the object of the present utility model.
In the first embodiment, the present embodiment provides a structure of a magnetic levitation motor kinetic energy feedback variable frequency driving system for a central air conditioner, as shown in fig. 1, specifically including a circuit breaker 1, a reactor 2, a rectifying module 100, an energy storage module 200, an inverter module 300, an IPS power supply 14 and a control board 11.
The input end of the circuit breaker 1 is connected with a mains supply grid 16, and the output end of the circuit breaker 1 is connected with a power input terminal of a thyristor 4 in the rectifying module 100 through a reactor 2;
the direct current output positive terminal and the direct current output negative terminal of the thyristor 4 in the rectifying module 100 are respectively connected with the positive electrode and the negative electrode of the energy storage module 200;
the positive electrode of the energy storage module 200 is connected with a direct current positive electrode input terminal of the IGBT module 8 in the inversion module 300, and the negative electrode of the energy storage module 200 is connected with a direct current negative electrode input terminal of the IGBT module 8 in the inversion module 300; an alternating current output terminal of the IGBT module 8 in the inversion module 300 is connected with a stator of the magnetic levitation motor 17;
wherein, the magnetic levitation motor 17 specifically includes: the device comprises a stator, a magnetic bearing, a displacement controller and a displacement sensor;
1) And a displacement controller: the device is mainly used for providing electric energy for the magnetic suspension bearing to suspend the magnetic bearing;
2) And (3) a stator: a motor stator is connected with three-phase alternating current to generate a rotating magnetic field, and a suspended rotor rotates under the action of electromagnetic force;
3) Magnetic bearing: the axial permanent magnet is arranged on the motor rotor and used for suspending the magnetic suspension bearing;
4) A displacement sensor: and feeding back the wire inlet position of the motor bearing, and providing a feedback signal for the displacement controller.
Further, the positive input terminal p+ and the negative input terminal P-of the IPS power supply 14 are connected to the positive electrode and the negative electrode of the energy storage module 200 through the power line 15, respectively; the output end of the IPS power supply 14 is connected with a displacement controller in the magnetic suspension motor 17;
further, the control board 11 is electrically connected to the thyristor driving board 3 in the rectifying module 100 and the plurality of IGBT driving boards 7 in the inverting module 300 specifically through the signal line 13.
As shown in fig. 2:
the rectification module 100 converts input ac into dc by three-phase half-control rectification, and the power-on voltage slowly rises to charge the dc link capacitor of the frequency converter, and specifically includes three thyristors 4 arranged in parallel, which are respectively: the thyristors RBR1, RBS1 and RBT1 are electrically connected with the thyristor driving plate 3;
the energy storage module 200 is configured to stabilize voltage and store electric energy, and specifically includes N energy storage capacitors 5 that are serially connected, and are respectively: energy storage capacitors C1-CN, and each energy storage capacitor is provided with an RVS equalizing resistor 6 in parallel;
the inverter module 300 is configured to output dc power as ac power with adjustable frequency, and specifically includes three parallel IGBT modules 8, which are respectively: the IGBT modules IU, IV and IW are connected in parallel, and each IGBT module is provided with a corresponding absorption capacitor 10, an IGBT driving interface of each IGBT module is electrically connected with a corresponding IGBT driving plate 7, and an alternating current output terminal of each IGBT module is electrically connected with a corresponding Hall sensor 9;
wherein, three absorption capacitors 10 are respectively: an absorption capacitance IUC, IVC, IWC; the three IGBT drive boards 7 are respectively: IGBT drive plate IUQ, IVQ, IWQ; the three hall sensors 9 are respectively: hall sensors UCT, VCT, WCT.
As shown in fig. 3, a terminal a of the thyristor is a power supply input for connecting with an output end of the reactor; the terminal B is a direct current output positive electrode and is used for connecting the positive electrode of the energy storage capacitor; the terminal C is a direct current output negative electrode and is used for connecting the negative electrode of the energy storage capacitor; the K1/G1 ports are all thyristor gate drive interfaces and are used for being connected with a thyristor drive board 3.
As shown in fig. 4, a terminal P of the IGBT module is a direct current positive input, and is used for connecting with a positive electrode of the energy storage capacitor; the terminal N is a direct current negative electrode input and is used for connecting the negative electrode of the energy storage capacitor; the terminal OUT is an alternating current output terminal and is used for connecting a stator of the magnetic suspension motor after passing through the Hall sensor; the E/G1 port and the E/G2 port are IGBT driving interfaces and are used for connecting an IGBT driving board.
The specific components are connected as follows:
the input end of the QF1 breaker is connected with a mains supply grid, the output end of the QF1 breaker is connected with an L reactor, and three output terminals of the L reactor are respectively connected to terminals A of RBR1, RBS1 and RBT1 thyristors through copper bars 12;
terminals B of RBR1, RBS1 and RBT1 thyristors are connected to the anodes of the C1-CN energy storage capacitors through copper bars 12;
terminals C of RBR1, RBS1 and RBT1 thyristors are connected to the cathodes of the C1-CN energy storage capacitors through copper bars 12;
the thyristor driving plates are respectively connected with gate driving interfaces of the RBR, RBS, RBT thyristors through signal wires 13;
the RVS equalizing resistors are respectively connected between the positive electrode and the negative electrode of the C1-CN energy storage capacitors in a bridging mode;
the anodes of the C1-CN energy storage capacitors are respectively connected with terminals P of three IGBT modules of IU, IV and IW through copper bars 12;
the cathodes of the C1-CN energy storage capacitors are respectively connected with the terminals N of three IGBT modules of IU, IV and IW through copper bars 12;
the IGBT driving interfaces of the IU, IV and IW three IGBT modules are respectively and directly connected with the IUQ, IVQ, IWQ three IGBT driving boards, and the bonding pads of the IGBT driving boards are particularly welded with the contacts of the IGBT driving interfaces by soldering tin;
IUC, IVC, IWC absorption capacitors are respectively connected between the terminals P and N of the IUQ, IVQ, IWQ three IGBT driving plates in a bridging manner;
terminal OUT of three IGBT modules of IU, IV, IW respectively pass through UCT, VCT, WCT Hall sensor and then are connected with stator three-phase input terminal of PM01 magnetic levitation motor;
the control board 11 is respectively connected with three IGBT driving boards of a thyristor driving board and IUQ, IVQ, IWQ and three Hall sensors of UCT, VCT, WCT through signal lines 13.
As shown in fig. 5, the IPS power supply 14 includes the following modules inside:
1) And an anti-reverse protection module: the direct current bus connection is prevented from being reversely connected, and the direct current bus connection is used for protection;
2) BUCK step-down module: the direct current voltage of the input end is reduced to be about 200VZ direct current voltage, and the direct current voltage is provided for a half-bridge LLC module for use;
3) Parallel half-bridge LLC modules: the output is regulated under the condition that the input voltage and the load change in a large range, the stable output of the output voltage is ensured to be +/-175V, and two groups of half-bridge LLCs are connected in parallel to increase the output power;
4) And a protection module: and protecting the module from overvoltage.
As shown in fig. 6, a general processing chip, such as a digital signal processing ARM32F chip, is disposed in the control board 11, a pin PA0 of the digital processing chip ARM32F of the control board 11 is connected to the hall sensor UCT, a pin PA1 is connected to the hall sensor VCT, and a pin PA2 is connected to the hall sensor WCT; a digital processing chip ARM32F pin PE8 of the control board 11 is connected with a driving board IUQ, a pin PE10 is connected with a driving board IVQ, and a pin PA12 is connected with a driving board IWQ; the digital processing chip ARM32F pins PE9, PE11 and PA13 of the control board 11 are all connected with a thyristor driving board.
Energy feedback working principle:
when the voltage of the commercial power is interrupted, the motor enters a generator state, direct current is reversely transmitted to an energy storage link through an inversion module, and voltage exists continuously between the buses P+/-before the motor is not stopped, so that electric energy feedback after the power grid is powered off is realized;
IPS power supply theory of operation:
1) When the voltage of the mains supply is normal, three-phase alternating current of the mains supply is converted into direct current through rectification and is stably existed in a direct current bus voltage between energy storage links P+/-and the bus voltage P+/-is loaded to an IPS input end, the voltage is regulated to 200V by a BUCK voltage reduction module through input anti-reverse protection, 200V direct current voltage is loaded to a parallel half-bridge LLC and is output to +175V and-175V after the voltage is regulated to the half-bridge LLC, two paths of BUCK voltage reduction and two sets of half-bridge LLCs are designed to be used in parallel for increasing power, and when the range of the IPS input voltage is between 225 and 800V, the output voltage can be stably output to +/-175V to provide power for a magnetic bearing to ensure that the bearing normally floats.
2) When the commercial power is interrupted, the motor enters a generator state, direct current is reversely conveyed to an energy storage link through an inversion module, voltage exists continuously between bus P+/-before the motor is not stopped, bus voltage P+/-voltage is loaded to an IPS input end and reaches a BUCK voltage reduction module through input anti-reverse protection, voltage is adjusted to 200V,200V direct current voltage is loaded to a parallel half-bridge LLC, and after the voltage is adjusted to the half-bridge LLC, +175V and-175V are output, two paths of BUCK voltage reduction and two sets of half-bridge LLC are designed to be used in parallel for increasing power, when the range of the IPS input voltage is 225-800V, the output voltage can be stably output +/-175V to supply power to a magnetic bearing to enable the bearing to keep suspended until the rotating speed of the motor is reduced to a safe range and then falls down.
Further, the non-detailed description of the present application is the same as or implemented by the prior art.
To sum up: adopt the utility model discloses a magnetic suspension motor kinetic energy feedback variable frequency drive system structure for central air conditioning:
1. the IPS power supply is matched with the energy storage module, and is directly connected with the bus copper bar to obtain electricity through the IPS power supply, so that the design of a power supply switching device and a transformer in a traditional driving system is replaced, the equipment cost is reduced, the modules are compactly connected and arranged, the whole volume is reduced, and the arrangement space is saved;
2. an energy feedback path is formed by the IPS power supply, the rectifying module, the energy storage module, the inversion module and the motor, when the voltage of the commercial power is interrupted, the motor enters a generator state, direct current is reversely conveyed to the energy storage link by the inversion module, electric energy feedback after power failure of the power grid is realized, and the energy utilization rate of the variable-frequency driving system is improved;
3. the electric energy provided by the energy feedback path is combined with the energy storage module and the IPS power supply, so that the magnetic bearing can be stably supplied with power, the bearing can be kept in suspension until the rotating speed of the magnetic suspension motor is reduced to a safe range and then falls down, and the system safety is high.
The above embodiments are merely for illustrating the design concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, the scope of the present utility model is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present utility model are within the scope of the present utility model.
Claims (10)
1. A magnetic suspension motor kinetic energy feedback variable frequency driving system structure for a central air conditioner is characterized in that: the power supply comprises a circuit breaker (1), a reactor (2), a rectifying module (100), an energy storage module (200), an inversion module (300) and an IPS power supply (14), wherein the input end of the circuit breaker (1) is connected with a mains supply grid (16), and the output end of the circuit breaker is connected with a power supply input terminal in the rectifying module (100) through the reactor (2); the direct current output positive terminal and the direct current output negative terminal in the rectifying module (100) are respectively connected with the positive electrode and the negative electrode of the energy storage module (200); the positive electrode and the negative electrode of the energy storage module (200) are respectively connected with a direct current positive electrode input terminal and a direct current negative electrode input terminal in the inversion module (300); an alternating current output terminal in the inversion module (300) is connected with a motor stator in the magnetic suspension motor (17); the positive electrode input end and the negative electrode input end of the IPS power supply (14) are respectively connected with the positive electrode and the negative electrode of the energy storage module (200), and the output end of the IPS power supply (14) is connected with a displacement controller in the magnetic suspension motor (17);
the rectification module (100) and the inversion module (300) are electrically connected with the control board (11).
2. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the rectifying module (100) comprises a plurality of thyristors (4) which are arranged in parallel, and a gate electrode driving interface of each thyristor (4) is connected with the thyristor driving plate (3).
3. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the energy storage module (200) comprises a plurality of energy storage capacitors (5) which are arranged in series, and each energy storage capacitor (5) is provided with a voltage equalizing resistor (6) in parallel.
4. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the inverter module (300) comprises a plurality of IGBT modules (8) which are arranged in parallel, each IGBT module (8) is provided with a corresponding absorption capacitor (10) in parallel, the IGBT driving interface of each IGBT module (8) is connected with a corresponding IGBT driving plate (7), and the alternating current output terminal of each IGBT module (8) is connected with a corresponding Hall sensor (9).
5. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the magnetic suspension motor (17) is internally provided with a magnetic suspension bearing, an electronic rotor, an electronic stator, a displacement controller and a displacement sensor, wherein the electronic stator is electrically connected with an alternating current output terminal in the inversion module (300), and the magnetic suspension bearing is electrically connected with the output end of the IPS power supply (14) through the displacement controller.
6. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 2, wherein: the power input terminal of each thyristor (4) is connected with the output terminal corresponding to the reactor (2), the direct current output positive terminal of each thyristor (4) is connected with the positive electrode of the energy storage module (200), and the direct current output negative terminal of each thyristor (4) is connected with the negative electrode of the energy storage module (200).
7. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 4, wherein: the direct current positive electrode input terminal of each IGBT module (8) is connected with the positive electrode of the energy storage module (200), and the direct current negative electrode input terminal of each IGBT module (8) is connected with the negative electrode of the energy storage module (200); the absorption capacitor (10) is connected between the direct current positive electrode input terminal and the direct current negative electrode input terminal of the corresponding IGBT module (8) in a bridging mode.
8. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the rectifying module (100) is electrically connected with terminals corresponding to the reactor (2) and the energy storage module (200) respectively through the copper bars (12), and the energy storage module (200) is electrically connected with terminals corresponding to the inversion module (300) through the copper bars (12).
9. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the IPS power supply (14) is electrically connected with terminals corresponding to the energy storage module (200) and the magnetic suspension motor (17) through power lines (15) respectively.
10. The structure of the magnetic levitation motor kinetic energy feedback variable frequency driving system for the central air conditioner according to claim 1, wherein: the control board (11) is electrically connected with the thyristor driving board (3) in the rectifying module (100) and the IGBT driving boards (7) in the inversion module (300) through the signal line (13).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322060866.9U CN220492698U (en) | 2023-08-02 | 2023-08-02 | Magnetic levitation motor kinetic energy feedback variable frequency driving system structure for central air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202322060866.9U CN220492698U (en) | 2023-08-02 | 2023-08-02 | Magnetic levitation motor kinetic energy feedback variable frequency driving system structure for central air conditioner |
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| CN220492698U true CN220492698U (en) | 2024-02-13 |
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