阅读说明：本技术 一种气源发生器系统及其控制方法 (Air source generator system and control method thereof ) 是由 产启中 楚佳雨 梁国坚 李新海 区荣均 郑宝玲 陈英杰 张志强 王伟平 陈昱 刘 于 2021-09-15 设计创作，主要内容包括：本申请公开了一种气源发生器系统及其控制方法,方法包括：若中央控制器获取的储气罐气压信号小于第一气压阈值,则发送启动指令至电机备自投控制模块,使得打开空气泵为净化管加压；若获取的气压信号大于第二气压阈值,则发送停止指令至电机备自投控制模块,停止空气泵工作；当接收到的净化管内的湿度信号大于第一湿度阈值时,则发送加热指令至净化部件自我再生模块,使得加热净化管内部的吸附剂,加热后的吸附净化管中的湿气,达到除湿的效果；当接收到的吸附剂温度信号大于第一温度阈值时,发送停止加热指令至净化部件自我再生模块,使得停止对吸附剂进行加热。本申请可以实现气源发生器的净化部件再生,同时对气源发生器运行工况实时传送。(The application discloses an air source generator system and a control method thereof, and the method comprises the following steps: if the air pressure signal of the air storage tank acquired by the central controller is smaller than a first air pressure threshold value, sending a starting instruction to the motor backup automatic switching control module to enable the air pump to be started to pressurize the purifying pipe; if the acquired air pressure signal is greater than a second air pressure threshold value, sending a stop instruction to the motor spare power automatic switching control module, and stopping the air pump; when the received humidity signal in the purification pipe is larger than a first humidity threshold value, a heating instruction is sent to the purification part self-regeneration module, so that the adsorbent in the purification pipe is heated, and the heated adsorbent adsorbs moisture in the purification pipe, thereby achieving the dehumidification effect; and when the received adsorbent temperature signal is greater than the first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the adsorbent is stopped from being heated. The application can realize the regeneration of the purification component of the gas source generator and simultaneously transmit the operation condition of the gas source generator in real time.)

1. An air source generator system, comprising: the system comprises a central controller, a data acquisition module, a motor spare power automatic switching control module and a purification component self-regeneration module;

the data acquisition module is used for acquiring a humidity signal, a temperature signal of an adsorbent and an air pressure signal of the air storage tank in the purifying pipe and transmitting the acquired signals to the central controller;

the motor spare power automatic switching control module is used for controlling an air pump to pressurize the purifying pipe;

the purification component self-regeneration module is used for heating the adsorbent in the purification pipe, adsorbing moisture in the purification pipe and achieving the dehumidification effect;

the central controller is used for sending a starting instruction to the motor automatic switching control module when the received air pressure signal is smaller than a preset first air pressure threshold value, so that the motor automatic switching control module turns on an air pump to pressurize the purifying pipe; when the received air pressure signal is greater than a preset second air pressure threshold value, sending a stop instruction to stop the air pump; when the received humidity signal is larger than a preset first humidity threshold value, a heating instruction is sent to the purification component self-regeneration module, so that the adsorbent in the purification pipe is heated; and when the temperature of the adsorbent is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

2. The gas source generator system of claim 1, further comprising a switch-controlled power supply and an emergency control button coupled to the switch-controlled power supply;

the switch control power supply is used for supplying power supply to the central controller and supplying current signals to the data acquisition module;

and the emergency control button is used for pressing the emergency control button by an operator when an emergency happens so as to stop the air source generator.

3. The gas source generator system of claim 1, further comprising a central human machine interface and a remote control module;

the central human-computer interface is used for controlling the work of each module on site;

the remote control module is used for remotely controlling the work of each module.

4. The gas source generator system of claim 1, further comprising a fault alarm module and a production monitoring command center and status display lights connected to the fault alarm module;

the fault alarm module is used for sending an alarm signal and sending alarm information to the production monitoring command center when an instruction in the system can not be executed, so that an operator can know fault information;

the state display lamp is used for displaying the working state of the corresponding module.

5. The gas source generator system of claim 1, further comprising a self-test repair module;

the self-checking repair module is used for sending a self-checking instruction to the central controller at regular time, so that the central controller sends corresponding self-checking instructions to each module, and sends repair instructions to the modules with unqualified self-checking according to received self-checking feedback signals of each module, and the repair instructions comprise automatic restart instructions or forced restart instructions.

6. A gas source generator control method applied to the system according to any one of claims 1 to 5, comprising:

if the acquired air pressure signal of the air storage tank is smaller than a preset first air pressure threshold value, sending a starting instruction to a motor backup power automatic switching control module, and enabling the motor backup power automatic switching control module to turn on an air pump to pressurize a purifying pipe;

if the acquired air pressure signal of the air storage tank is greater than a preset second air pressure threshold value, sending a stop instruction to the motor spare power automatic switching control module, and stopping the air pump from working;

when the received humidity signal in the purification pipe is larger than a preset first humidity threshold value, a heating instruction is sent to the purification part self-regeneration module, so that the purification part self-regeneration module heats the adsorbent in the purification pipe, and the heated adsorbent adsorbs moisture in the purification pipe, thereby achieving the dehumidification effect;

and when the received adsorbent temperature signal is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

7. The gas source generator control method according to claim 6, further comprising:

and when the sent execution instruction is not executed by the corresponding module, acquiring alarm information of the corresponding module, and sending the alarm information to a production monitoring command center, so that the operating personnel can know the fault information.

8. The gas source generator control method according to claim 6, further comprising:

sending a self-checking instruction to a corresponding module at regular time, and receiving a self-checking feedback signal of the corresponding module;

and sending a repair instruction to a module which is unqualified in self-inspection, wherein the repair instruction comprises an automatic restart instruction or a forced restart instruction.

9. The gas source generator control method according to claim 6, further comprising:

when the obtained current signal of the switch control power supply is larger than a preset current threshold value, a starting signal is sent to the fan, so that the fan cools the system.

10. The gas source generator control method according to claim 6, further comprising:

when the air pump is detected to be started for a preset time interval and the received air pressure signal variation of the air storage tank is smaller than a preset third air pressure threshold value, judging that the air pump is abnormal, and switching to another air pump to work;

when the air pump works continuously for a first preset time or works discontinuously within a second preset time without replacement, the other air pump is replaced after the first preset time or the second preset time.

Technical Field

The application relates to the technical field of transformer detection, in particular to an air source generator system and a control method thereof.

Background

At present, with the development of society, a transformer is used as the most important equipment in a power system, the safe operation of the transformer needs to be strictly guaranteed, the state of transformer oil directly reflects whether the operation state of the transformer is abnormal or not, and the online monitoring device for the dissolved gas in the transformer oil can realize the real-time monitoring of the transformer oil. The carrier gas is a prerequisite for reliable operation of the online monitoring device for the dissolved gas in the transformer oil, if the carrier gas in the carrier gas cylinder is used up or a gas source module fails, the online monitoring device for the dissolved gas in the transformer oil cannot work normally, further the transformer oil cannot be monitored, and once some potential failures are found, great loss may be caused, and power supply reliability is affected.

At present, most of on-line monitoring devices for dissolved gas in transformer oil rely on gas cylinders to provide carrier gas, operators need to replace the carrier gas on site at regular intervals, and along with more and more stations such as transformer substations and converter stations, the distribution is dispersed, a large amount of manpower and material resources need to be consumed to replace the carrier gas, so that difficulty is brought to maintenance work, and the working efficiency is seriously influenced.

The manufacturer of the on-line monitoring device for the dissolved gas in the partial oil can provide carrier gas for the device in a mode of taking gas on site for the on-line monitoring device for the dissolved gas in the newly delivered oil, and the air source module cleans, filters, purifies and compresses the air and stores the air in the air storage tank.

Disclosure of Invention

The application provides an air source generator system and a control method thereof, which can realize the regeneration of a purification component of an air source generator and transmit the operation condition of the air source generator in real time.

In view of the above, a first aspect of the present application provides an air source generator system, the system comprising:

the system comprises a central controller, a data acquisition module, a motor spare power automatic switching control module and a purification component self-regeneration module;

the data acquisition module is used for acquiring a humidity signal, a temperature signal of an adsorbent and an air pressure signal of the air storage tank in the purifying pipe and transmitting the acquired signals to the central controller;

the motor spare power automatic switching control module is used for controlling an air pump to pressurize the purifying pipe;

the purification component self-regeneration module is used for heating the adsorbent in the purification pipe, adsorbing moisture in the purification pipe and achieving the dehumidification effect;

the central controller is used for sending a starting instruction to the motor automatic switching control module when the received air pressure signal is smaller than a preset first air pressure threshold value, so that the motor automatic switching control module turns on an air pump to pressurize the purifying pipe; when the received air pressure signal is greater than a preset second air pressure threshold value, sending a stop instruction to stop the air pump; when the received humidity signal is larger than a preset first humidity threshold value, a heating instruction is sent to the purification component self-regeneration module, so that the adsorbent in the purification pipe is heated; and when the temperature of the adsorbent is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

Optionally, the emergency control device further comprises a switch control power supply and an emergency control button connected with the switch control power supply;

the switch control power supply is used for supplying power supply to the central controller and supplying current signals to the data acquisition module;

and the emergency control button is used for pressing the emergency control button by an operator when an emergency happens so as to stop the air source generator.

Optionally, the system further comprises a central human-computer interface and a remote control module;

the central human-computer interface is used for controlling the work of each module on site;

the remote control module is used for remotely controlling the work of each module.

Optionally, the system further comprises a fault alarm module, a production monitoring command center and a state display lamp, wherein the production monitoring command center and the state display lamp are connected with the fault alarm module;

the fault alarm module is used for sending an alarm signal and sending alarm information to the production monitoring command center when an instruction in the system can not be executed, so that an operator can know fault information;

the state display lamp is used for displaying the working state of the corresponding module.

Optionally, the system further comprises a self-checking repair module;

the self-checking repair module is used for sending a self-checking instruction to the central controller at regular time, so that the central controller sends corresponding self-checking instructions to each module, and sends repair instructions to the modules with unqualified self-checking according to received self-checking feedback signals of each module, and the repair instructions comprise automatic restart instructions or forced restart instructions.

A second aspect of the present application provides a method of controlling an air source generator, the method comprising:

if the acquired air pressure signal of the air storage tank is smaller than a preset first air pressure threshold value, sending a starting instruction to a motor backup power automatic switching control module, and enabling the motor backup power automatic switching control module to turn on an air pump to pressurize a purifying pipe;

if the acquired air pressure signal of the air storage tank is greater than a preset second air pressure threshold value, sending a stop instruction to the motor spare power automatic switching control module, and stopping the air pump from working;

when the received humidity signal in the purification pipe is larger than a preset first humidity threshold value, a heating instruction is sent to the purification part self-regeneration module, so that the purification part self-regeneration module heats the adsorbent in the purification pipe, and the heated adsorbent adsorbs moisture in the purification pipe, thereby achieving the dehumidification effect;

and when the received adsorbent temperature signal is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

Optionally, the method further includes:

and when the sent execution instruction is not executed by the corresponding module, acquiring alarm information of the corresponding module, and sending the alarm information to a production monitoring command center, so that the operating personnel can know the fault information.

Optionally, the method further includes:

sending a self-checking instruction to a corresponding module at regular time, and receiving a self-checking feedback signal of the corresponding module;

and sending a repair instruction to a module which is unqualified in self-inspection, wherein the repair instruction comprises an automatic restart instruction or a forced restart instruction.

Optionally, the method further includes:

when the obtained current signal of the switch control power supply is larger than a preset current threshold value, a starting signal is sent to the fan, so that the fan cools the system.

Optionally, the method further includes:

when the air pump is detected to be started for a preset time interval and the received air pressure signal variation of the air storage tank is smaller than a preset third air pressure threshold value, judging that the air pump is abnormal, and switching to another air pump to work;

when the air pump works continuously for a first preset time or works discontinuously within a second preset time without replacement, the other air pump is replaced after the first preset time or the second preset time.

According to the technical scheme, the method has the following advantages:

the application provides a control method of an air source generator, which comprises the following steps: if the acquired air pressure signal of the air storage tank is smaller than a preset first air pressure threshold value, sending a starting instruction to the motor backup power automatic switching control module, and enabling the motor backup power automatic switching control module to turn on an air pump to pressurize the purifying pipe; if the acquired air pressure signal of the air storage tank is greater than a preset second air pressure threshold value, sending a stop instruction to the motor spare power automatic switching control module, and stopping the air pump from working; when the received humidity signal in the purification pipe is larger than a preset first humidity threshold value, a heating instruction is sent to the purification part self-regeneration module, so that the purification part self-regeneration module heats the adsorbent in the purification pipe, and the heated adsorbent adsorbs moisture in the purification pipe, thereby achieving the dehumidification effect; and when the received adsorbent temperature signal is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

This application gathers the humidity signal in the purge tube, the temperature signal of adsorbent and the atmospheric pressure signal of gas holder through the data acquisition module of central integrated control's gas source generator system for central controller controls the pressure of gas holder and the humidity in the purge tube according to the signal of gathering, realizes taking a breath in the purification unit, realizes the purification unit regeneration of gas source generator, has reduced the work load of people for trading the carrier gas.

Drawings

FIG. 1 is a system architecture diagram of one embodiment of an air source generator system of the present application;

FIG. 2 is a system architecture diagram of another particular embodiment of an air source generator system of the present application;

FIG. 3 is a flow chart of a method in an embodiment of a method for controlling an air source generator according to the present application.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a system architecture diagram of an embodiment of a central integrated control gas source generator system according to the present application, as shown in fig. 1, where fig. 1 includes:

the system comprises a central controller 11, a data acquisition module 14, a motor spare power automatic switching control module 15 and a purification component self-regeneration module 16;

the data acquisition module 14 is used for acquiring a humidity signal in the purification pipe, a temperature signal of the adsorbent and an air pressure signal of the air storage tank and transmitting the acquired signals to the central controller;

the motor spare power automatic switching control module 15 is used for controlling an air pump to pressurize the purifying pipe;

the purification component self-regeneration module 16 is used for heating the adsorbent in the purification pipe, adsorbing the moisture in the purification pipe and achieving the dehumidification effect;

the central controller 11 is configured to send a start instruction to the motor backup automatic switching control module 15 when the received air pressure signal is smaller than a preset first air pressure threshold, so that the motor backup automatic switching control module 15 turns on an air pump to pressurize the purge tube; when the received air pressure signal is greater than a preset second air pressure threshold value, sending a stop instruction to stop the air pump; when the received humidity signal is greater than a preset first humidity threshold, sending a heating instruction to the purification component self-regeneration module 16, so as to heat the adsorbent in the purification tube 16; when the temperature of the adsorbent is greater than the preset first temperature threshold, a heating stop instruction is sent to the purification component self-regeneration module 16, so that the purification component self-regeneration module 16 stops heating the adsorbent.

It should be noted that the central controller 11 is a programmable controller, and realizes control over each module; the data acquisition module 14 acquires a humidity signal in the purification tube, a temperature signal of the adsorbent and an air pressure signal of the air storage tank through the analog quantity A/D conversion module, and transmits the acquired signals to the central controller. The motor backup power automatic switching control module 15 comprises a standby motor, and when the currently used motor fails or the continuous operation time exceeds the specified time, the standby motor is automatically switched, so that the service life of the motor is prolonged, and the online rate of the device is increased. The purification component self-regeneration module 16 comprises a heating device and a dehumidifying device which are designed to automatically activate the adsorbent in the purification pipe, so that the service cycle of the adsorbent is greatly prolonged, and the maintenance cycle of the instrument is reduced.

Specifically, after the central controller acquires the air pressure signal of the air storage tank acquired by the data acquisition module, when the pressure of the air storage tank is identified to be smaller than a first air pressure threshold value, an air pump starting instruction is sent out, and when the pressure of the received air storage tank is larger than a second air pressure threshold value, an air pump stopping instruction is sent out by the central controller.

When the central controller 11 acquires a humidity signal in the purification tube acquired by the data acquisition module and displays that the humidity is greater than a first humidity threshold value, the central controller 11 sends an instruction for starting the adsorbent to heat and dry, so that the purification tube starts to absorb moisture after being heated, and meanwhile, a moisture exhaust valve is opened to exhaust the moisture; and when the temperature of the adsorbent is higher than the first temperature threshold value, the information is transmitted to the central controller, and the central controller sends out an instruction for stopping the temperature rise and drying of the adsorbent after receiving the information and closes the dehumidifying valve.

This application gathers the humidity signal in the purge tube, the temperature signal of adsorbent and the atmospheric pressure signal of gas holder through the data acquisition module of central integrated control's gas source generator system for central controller controls the pressure of gas holder and the humidity in the purge tube according to the signal of gathering, realizes taking a breath in the purification unit, realizes the purification unit regeneration of gas source generator, has reduced the work load of people for trading the carrier gas.

The present application further provides another specific embodiment of an air source generator system, as shown in fig. 2, where fig. 2 includes:

a switch control power supply 12 and an emergency control button connected to the switch control power supply 12;

the switch control power supply 12 is used for supplying power supply to the central controller 11 and supplying current signals to the data acquisition module 14;

the emergency control button is used for pressing the emergency control button by an operator when an emergency happens so as to stop the air source generator.

It should be noted that the switch and control power supply 12 further includes an emergency stop module connected to the central controller, and the control power supply is a direct current 24V power supply and is used for supplying power to the central controller 11. The data acquisition module 14 can acquire the output current of the switch and the control power supply in real time, and if the current is greater than a preset current threshold, the central controller 11 controls the fan to be turned on to cool the system. When the system is powered on, the emergency control button is normally closed, and when an emergency occurs, the emergency button is pressed down, the emergency button is disconnected, and the air source generator stops working.

In a particular embodiment, it also comprises a central human-machine interface 13 and a remote control module 19; the central man-machine interface 13 is used for controlling the work of each module on site; the remote control module 19 is used for remotely controlling the operation of each module.

It should be noted that the central human-machine interface 13 can manually implement various functions of the system, and can perform comprehensive inspection and maintenance on each component when performing field system maintenance. The remote control module 19 stores the central controller system on the cloud through the local area network, so that remote operation and remote control can be realized. The home page interface of the central human-machine interface 13 comprises local/remote options, when local operation is needed, the home page interface is switched to the local, remote is generally defaulted, when the home page interface is switched to the local mode, remote operation cannot be carried out, the local mode can carry out a series of maintenance work through the central human-machine interface, and other modules can be started.

In a specific embodiment, the system further comprises a fault alarm module 18, and a production monitoring command center (a department for collecting signals and data of all on-line monitoring devices on production and remotely processing and maintaining) and a status display lamp which are connected with the fault alarm module 18; the fault alarm module 18 is used for sending an alarm signal when an instruction in the system can not be executed, and sending alarm information to a production monitoring command center so that an operator can know fault information; the state display lamp is used for displaying the working state of the corresponding module.

It should be noted that the fault alarm module 18 includes a status display lamp for each module, and the status display lamp may be a three-color alarm indicator lamp (red indicates a hardware fault, yellow indicates a software fault, and green indicates normal), and when there is an instruction in the system that cannot be executed, the fault alarm module transmits alarm information to the production monitoring command center, and simultaneously transmits an alarm short message to an operator.

In a specific embodiment, the system further comprises a self-test repair module 17;

the self-checking repair module 17 is configured to send a self-checking instruction to the central controller 11 at regular time, so that the central controller 11 sends a corresponding self-checking instruction to each module, and sends a repair instruction to a module that is not qualified in self-checking according to a received self-checking feedback signal of each module, where the repair instruction includes an automatic restart instruction or a forced restart instruction.

It should be noted that the self-checking repair module 17 is started regularly every day, and a self-checking instruction is sent to all modules regularly, after the self-checking instruction is sent, the central controller 11 transmits the instruction to each module, and simultaneously feeds back the self-checking result to the central controller, the central controller starts the self-checking repair module for the module with unqualified self-checking according to the self-checking result, and the self-repairing module mainly sends an automatic restart instruction or a forced restart instruction according to the program crash condition.

The present application further provides an embodiment of a control method for an air source generator, as shown in fig. 3, where fig. 3 includes:

201. if the acquired air pressure signal of the air storage tank is smaller than a preset first air pressure threshold value, sending a starting instruction to the motor backup power automatic switching control module, and enabling the motor backup power automatic switching control module to turn on an air pump to pressurize the purifying pipe;

202. if the acquired air pressure signal of the air storage tank is greater than a preset second air pressure threshold value, sending a stop instruction to the motor spare power automatic switching control module, and stopping the air pump from working;

203. when the received humidity signal in the purification pipe is larger than a preset first humidity threshold value, a heating instruction is sent to the purification part self-regeneration module, so that the purification part self-regeneration module heats the adsorbent in the purification pipe, and the heated adsorbent adsorbs moisture in the purification pipe, thereby achieving the dehumidification effect;

204. and when the received adsorbent temperature signal is greater than a preset first temperature threshold value, sending a heating stopping instruction to the purification component self-regeneration module, so that the purification component self-regeneration module stops heating the adsorbent.

In a specific embodiment, the method further comprises the following steps:

and when the sent execution instruction is not executed by the corresponding module, acquiring alarm information of the corresponding module, and sending the alarm information to a production monitoring command center, so that the operating personnel can know the fault information.

In a specific embodiment, the method further comprises the following steps:

sending a self-checking instruction to a corresponding module at regular time, and receiving a self-checking feedback signal of the corresponding module;

and sending a repair instruction to the module with the unqualified self-inspection, wherein the repair instruction comprises an automatic restart instruction or a forced restart instruction.

In a specific embodiment, the method further comprises the following steps:

when the obtained current signal of the switch control power supply is larger than a preset current threshold value, a starting signal is sent to the fan, so that the fan cools the system.

In a specific embodiment, when the variation of the received air pressure signal of the air storage tank is smaller than a preset third air pressure threshold after the air pump is started for a preset time interval, the air pump is judged to be abnormal, and then the air pump is switched to work;

when the air pump works continuously for a first preset time or works discontinuously within a second preset time without replacement, the other air pump is replaced after the first preset time or the second preset time.

It should be noted that when the central controller receives the air pressure signal and displays the pressure insufficiency information, it sends an instruction to start the air pump, after the motor automatic backup switching control module receives the instruction, it defaults to start the air pump used last time, after the air pump is started for ten minutes, the pressure information received by the central controller is still unchanged or the change is not more than 0.1MPa, it is determined that the current air pump is abnormal, and the motor automatic backup switching module sends a switch to another air pump.

The motor spare power automatic switching module is also started when the following conditions occur:

a) when the air pump is used for 10 days, switching to another air pump;

b) when the air pump continuously works for 1h, the air pump is switched to another air pump.

The spare power automatic switching design is favorable for prolonging the service life of the air pump and improving the online rate of the device.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.