CN108362026A - A kind of carbon dioxide trans-critical cycle cool and thermal power combined system - Google Patents
A kind of carbon dioxide trans-critical cycle cool and thermal power combined system Download PDFInfo
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- CN108362026A CN108362026A CN201810352366.3A CN201810352366A CN108362026A CN 108362026 A CN108362026 A CN 108362026A CN 201810352366 A CN201810352366 A CN 201810352366A CN 108362026 A CN108362026 A CN 108362026A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 56
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000012530 fluid Substances 0.000 claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 4
- 239000007924 injection Substances 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims 2
- 239000008400 supply water Substances 0.000 claims 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 229910002090 carbon oxide Inorganic materials 0.000 claims 1
- 239000013589 supplement Substances 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 35
- 238000009835 boiling Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/06—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using expanders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
本发明公开一种二氧化碳跨临界循环冷热电组合系统，其二氧化碳压缩机出口与气体冷却器换热管的二氧化碳气体入口连接，气体冷却器换热管的二氧化碳气体出口与喷射器的主流体入口连接，喷射器的扩压端出口与气液分离器的第四接管连接，气液分离器的第一接管与二氧化碳压缩机的入口连接，气液分离器的第二接管与热水箱的二氧化碳换热管出口接管连接，热水箱的二氧化碳换热管入口接管与涡流管的热气体扩压端的出口连接，涡流管的主流体入口接管与气液分离器的第三接管连接，涡流管的冷流体出口与蒸发器的入口连接，蒸发器的出口与喷射器的引射入口连接。本发明结构简单、安装方便、工作稳定，有效提高循环系统的能效。
The invention discloses a carbon dioxide transcritical cycle cooling, heating and power combination system, the outlet of the carbon dioxide compressor is connected with the carbon dioxide gas inlet of the heat exchange tube of the gas cooler, and the carbon dioxide gas outlet of the heat exchange tube of the gas cooler is connected with the main fluid inlet of the ejector Connection, the diffuser outlet of the ejector is connected to the fourth connecting pipe of the gas-liquid separator, the first connecting pipe of the gas-liquid separator is connected to the inlet of the carbon dioxide compressor, the second connecting pipe of the gas-liquid separator is connected to the carbon dioxide of the hot water tank The heat exchange tube outlet connection is connected, the carbon dioxide heat exchange tube inlet connection of the hot water tank is connected with the outlet of the hot gas diffuser end of the vortex tube, the main fluid inlet connection of the vortex tube is connected with the third connection tube of the gas-liquid separator, and the vortex tube The outlet of the cold fluid is connected with the inlet of the evaporator, and the outlet of the evaporator is connected with the injection inlet of the injector. The invention has the advantages of simple structure, convenient installation and stable operation, and effectively improves the energy efficiency of the circulation system.
Description
技术领域technical field
本发明涉及一种制冷技术领域，特别是涉及一种二氧化碳跨临界循环冷热电组合系统。The invention relates to the technical field of refrigeration, in particular to a carbon dioxide transcritical cycle cooling, heating and power combination system.
背景技术Background technique
科技的飞速发展，造成环境污染和资源危机。二氧化碳具有良好的热力特性，二氧化碳跨临界循环的气体冷却器中压力和温度相互独立，二氧化碳放出热量可以加热低沸点工质，产生的蒸气驱动汽轮机发电。此外，二氧化碳系统中节流降压元件的节流过程损失较大，系统的性能系数较低。The rapid development of science and technology has caused environmental pollution and resource crisis. Carbon dioxide has good thermodynamic properties. The pressure and temperature in the gas cooler of the carbon dioxide transcritical cycle are independent of each other. The heat released by carbon dioxide can heat the low boiling point working medium, and the generated steam drives the steam turbine to generate electricity. In addition, the throttling process loss of the throttling step-down element in the carbon dioxide system is relatively large, and the performance coefficient of the system is low.
发明内容Contents of the invention
本发明的目的是针对现有技术存在的技术缺陷，提供一种二氧化碳跨临界循环冷热电组合系统。The object of the present invention is to provide a carbon dioxide transcritical cycle cooling, heating and power combined system aiming at the technical defects existing in the prior art.
为实现本发明的目的所采用的技术方案是：The technical scheme adopted for realizing the purpose of the present invention is:
一种二氧化碳跨临界循环冷热电组合系统，包括气体冷却器、循环泵、热水箱、发电机、汽轮机、气液分离器、涡流管、蒸发器、喷射器、二氧化碳压缩机；所述二氧化碳压缩机的出口与气体冷却器换热管的二氧化碳气体入口连接，气体冷却器换热管的二氧化碳气体出口与喷射器的主流体入口连接，喷射器的扩压端出口与气液分离器的第四接管连接，气液分离器的第一接管与二氧化碳压缩机的入口连接，气液分离器的第二接管与热水箱的二氧化碳换热管出口接管连接，热水箱的二氧化碳换热管入口接管与涡流管的热气体扩压端的出口连接，涡流管的主流体入口接管与气液分离器的第三接管连接，涡流管的冷流体出口与蒸发器的入口连接，蒸发器的出口与喷射器的引射入口连接；所述循环泵的出口与气体冷却器的发电循环工质的入口连接，气体冷却器的发电循环工质的出口与汽轮机的入口连接，汽轮机的出口与热水箱内的发电循环工质的换热管入口连接，热水箱的发电循环工质换热管的出口与循环泵的入口连接。A carbon dioxide transcritical cycle combined cooling and heating system, including a gas cooler, a circulation pump, a hot water tank, a generator, a steam turbine, a gas-liquid separator, a vortex tube, an evaporator, an ejector, and a carbon dioxide compressor; the carbon dioxide The outlet of the compressor is connected to the carbon dioxide gas inlet of the heat exchange tube of the gas cooler, the carbon dioxide gas outlet of the heat exchange tube of the gas cooler is connected to the main fluid inlet of the ejector, and the outlet of the diffuser end of the ejector is connected to the first gas-liquid separator. Four connecting pipes, the first connecting pipe of the gas-liquid separator is connected to the inlet of the carbon dioxide compressor, the second connecting pipe of the gas-liquid separator is connected to the outlet pipe of the carbon dioxide heat exchange pipe of the hot water tank, and the inlet of the carbon dioxide heat exchange pipe of the hot water tank is connected The connecting pipe is connected to the outlet of the hot gas diffuser end of the vortex tube, the main fluid inlet connecting pipe of the vortex tube is connected to the third connecting pipe of the gas-liquid separator, the cold fluid outlet of the vortex tube is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the injection The outlet of the circulating pump is connected to the inlet of the power generation circulating working fluid of the gas cooler, the outlet of the power generating circulating working medium of the gas cooler is connected to the inlet of the steam turbine, and the outlet of the steam turbine is connected to the hot water tank The inlet of the heat exchange tube of the power generation circulating working fluid is connected, and the outlet of the heat exchange tube of the power generation circulating working medium of the hot water tank is connected with the inlet of the circulating pump.
所述热水箱的补水阀通过补水管与热水箱的补水口连接，供热水阀通过供热水管与热水箱的供热水口连接。The water supply valve of the hot water tank is connected with the water supply port of the hot water tank through the water supply pipe, and the hot water supply valve is connected with the water supply port of the hot water tank through the water supply pipe.
所述发电机的主轴与汽轮机的主轴通过联轴器同心连接。The main shaft of the generator is concentrically connected with the main shaft of the steam turbine through a coupling.
与现有技术相比，本发明的有益效果是：Compared with prior art, the beneficial effect of the present invention is:
1.本发明的二氧化碳跨临界循环冷热电组合系统，采用喷射器代替常规节流降压元件，使得气体冷却器出口超临界区的二氧化碳节流过程接近等熵膨胀过程，减少膨胀过程的损失，而且可以提高系统的性能。1. In the carbon dioxide transcritical cycle cooling, heating and power combination system of the present invention, the ejector is used to replace the conventional throttling and pressure-reducing components, so that the carbon dioxide throttling process in the supercritical region at the outlet of the gas cooler is close to the isentropic expansion process, reducing the loss of the expansion process , and can improve system performance.
2.本发明采用涡流管使气液分离器分离出的二氧化碳液体涡流膨胀降压，产生的冷流体在蒸发器内吸热制冷，经扩压段扩压的热气体进入热水箱，加热水，同时利用低沸点工质气体冷凝余热制取热水。2. The present invention uses a vortex tube to vortex expand and decompress the carbon dioxide liquid separated by the gas-liquid separator, and the cold fluid produced absorbs heat and refrigerates in the evaporator, and the hot gas diffused by the diffuser section enters the hot water tank to heat the water At the same time, hot water is produced by using the waste heat of condensation of low-boiling point working fluid gas.
3.二氧化碳在气体冷却器放出的热量加热低沸点工质，低沸点工质气体带汽轮机发电，产生的电能可用于驱动二氧化碳压缩机和循环泵，减低系统电力消耗。3. The heat released by the carbon dioxide in the gas cooler heats the low-boiling point working medium, and the low-boiling point working medium gas is driven by a steam turbine to generate electricity. The generated electricity can be used to drive the carbon dioxide compressor and circulation pump, reducing the power consumption of the system.
4.本发明的系统，结构简单、安装方便、工作稳定，有效提高循环系统的能效。保护环境、节约能源。4. The system of the present invention has simple structure, convenient installation and stable operation, and can effectively improve the energy efficiency of the circulation system. Protect the environment and save energy.
附图说明Description of drawings
图1所示为本发明的二氧化碳跨临界循环冷热电组合系统示意图；Fig. 1 shows the schematic diagram of the carbon dioxide transcritical cycle combined cooling, heating and power system of the present invention;
图2是气液分离器的四个接管的布置示意图。Fig. 2 is a schematic diagram of the arrangement of four connecting pipes of the gas-liquid separator.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
如图1-2所示，本发明的二氧化碳跨临界循环冷热电组合系统，包括：As shown in Figure 1-2, the carbon dioxide transcritical cycle combined cooling, heating and power system of the present invention includes:
气体冷却器1、循环泵2、热水箱3、发电机4、汽轮机5、气液分离器6、涡流管7、蒸发器8、喷射器9、二氧化碳压缩机10。Gas cooler 1, circulating pump 2, hot water tank 3, generator 4, steam turbine 5, gas-liquid separator 6, vortex tube 7, evaporator 8, ejector 9, carbon dioxide compressor 10.
所述二氧化碳压缩机10的出口与气体冷却器1的换热管的二氧化碳气体入口连接，气体冷却器1的换热管的二氧化碳气体出口与喷射器9的主流体入口连接，喷射器9的扩压端出口与气液分离器6的第四接管16连接，气液分离器6的第一接管13与二氧化碳压缩机10的入口连接，气液分离器6的第二接管14与热水箱3的二氧化碳换热管出口接管连接，热水箱3的二氧化碳换热管入口接管与涡流管7的热气体扩压端的出口连接，涡流管7的主流体入口接管与气液分离器6的第三接管15连接，涡流管7的冷流体出口与蒸发器8的入口连接，蒸发器8的出口与喷射器9的引射入口连接。The outlet of the carbon dioxide compressor 10 is connected to the carbon dioxide gas inlet of the heat exchange tube of the gas cooler 1, and the carbon dioxide gas outlet of the heat exchange tube of the gas cooler 1 is connected to the main fluid inlet of the injector 9, and the expander of the injector 9 The outlet of the pressure end is connected to the fourth connecting pipe 16 of the gas-liquid separator 6, the first connecting pipe 13 of the gas-liquid separator 6 is connected to the inlet of the carbon dioxide compressor 10, the second connecting pipe 14 of the gas-liquid separator 6 is connected to the hot water tank 3 The outlet of the carbon dioxide heat exchange tube of the hot water tank 3 is connected to the outlet of the hot gas diffuser end of the vortex tube 7, and the main fluid inlet of the vortex tube 7 is connected to the third of the gas-liquid separator 6. The connecting pipe 15 is connected, the cold fluid outlet of the vortex tube 7 is connected with the inlet of the evaporator 8 , and the outlet of the evaporator 8 is connected with the injection inlet of the injector 9 .
所述循环泵2的出口与气体冷却器1的发电循环工质的入口连接，气体冷却器1的发电循环工质的出口与汽轮机5的入口连接，汽轮机5的出口与热水箱3内的发电循环工质的换热管入口连接，热水箱3的发电循环工质换热管的出口与循环泵2的入口连接。The outlet of the circulating pump 2 is connected to the inlet of the power generation circulating working medium of the gas cooler 1, the outlet of the power generating circulating working medium of the gas cooler 1 is connected to the inlet of the steam turbine 5, and the outlet of the steam turbine 5 is connected to the water in the hot water tank 3. The inlet of the heat exchange tube of the power generation circulating working medium is connected, and the outlet of the heat exchange tube of the power generation circulating working medium of the hot water tank 3 is connected with the inlet of the circulating pump 2 .
其中，所述热水箱3的补水阀11通过补水管与热水箱3的补水口连接，供热水阀12通过供热水管与热水箱3的供热水口连接。Wherein, the water supply valve 11 of the hot water tank 3 is connected to the water supply port of the hot water tank 3 through a water supply pipe, and the hot water supply valve 12 is connected to the water supply port of the hot water tank 3 through a water supply pipe.
其中，所述发电机4的主轴与汽轮机5的主轴通过联轴器同心连接。Wherein, the main shaft of the generator 4 is concentrically connected with the main shaft of the steam turbine 5 through a coupling.
本发明中，二氧化碳循环为跨临界循环，发电循环工质为低沸点工质。In the present invention, the carbon dioxide cycle is a transcritical cycle, and the power generation cycle working medium is a low boiling point working medium.
当系统运行时，二氧化碳压缩机10的出口排出的高温高压二氧化碳气体进入气体冷却器1的换热管内，二氧化碳气体放出热量，加热气体冷却器内换热管外的低沸点工质，低沸点工质气体带汽轮机5发电，经发电机4产生的电能可用于驱动二氧化碳压缩机和循环泵。气体冷却器出口气体将喷射器的主流体喷嘴入口压力降低，引射蒸发器8出口的二氧化碳气体，喷射器扩压出口的气液混合流体通过第四接管进入气液分离器6，分离出的二氧化碳液体通过第三接管而进入涡流管7的涡室涡流膨胀，涡流管7产生的冷流体进入蒸发器，在蒸发器内吸热制冷，提供冷源；同时，经涡流管的扩压段扩压形成的热气体进入热水箱的二氧化碳换热管内，二氧化碳换热管的出口通过第二接管14连接气液分离器6，低沸点工质气体冷凝，余热制取热水，提供热源；气液分离器的第一接管13通过二氧化碳压缩机10的入口将内部的低温低压二氧化碳排入二氧化碳压缩机，实现二氧化碳跨临界循环。When the system is running, the high-temperature and high-pressure carbon dioxide gas discharged from the outlet of the carbon dioxide compressor 10 enters the heat exchange tube of the gas cooler 1, and the carbon dioxide gas releases heat to heat the low-boiling-point working medium outside the heat-exchange tube in the gas cooler. The gas is generated with a steam turbine 5, and the electric energy generated by the generator 4 can be used to drive a carbon dioxide compressor and a circulation pump. The gas at the outlet of the gas cooler lowers the inlet pressure of the main fluid nozzle of the injector, injects the carbon dioxide gas at the outlet of the evaporator 8, and the gas-liquid mixed fluid at the diffuser outlet of the injector enters the gas-liquid separator 6 through the fourth connecting pipe, and the separated The carbon dioxide liquid enters the vortex chamber of the vortex tube 7 for vortex expansion through the third connecting pipe, and the cold fluid generated by the vortex tube 7 enters the evaporator, absorbs heat and refrigerates in the evaporator, and provides a cold source; The hot gas formed by pressure enters the carbon dioxide heat exchange tube of the hot water tank, the outlet of the carbon dioxide heat exchange tube is connected to the gas-liquid separator 6 through the second connecting pipe 14, the low boiling point working medium gas is condensed, and the waste heat is used to produce hot water and provide a heat source; The first connecting pipe 13 of the liquid separator discharges the internal low-temperature and low-pressure carbon dioxide into the carbon dioxide compressor through the inlet of the carbon dioxide compressor 10 to realize the transcritical cycle of carbon dioxide.
本发明采用两相喷射器代替传统的膨胀节流装置，不仅可以通过产生等熵膨胀过程来减少膨胀过程的损失，而且可提高系统的性能。同时，利用涡流膨胀降压，减少系统不可逆损失，分离出的冷气体吸热提供冷源，分离出的热气体和低沸点工质气体冷凝，余热制取热水，可以有效地改善系统性能。The invention adopts a two-phase injector to replace the traditional expansion throttling device, which can not only reduce the loss of the expansion process by generating an isentropic expansion process, but also improve the performance of the system. At the same time, vortex expansion and depressurization are used to reduce the irreversible loss of the system. The separated cold gas absorbs heat to provide a cold source, the separated hot gas and low-boiling point working gas condense, and the waste heat is used to produce hot water, which can effectively improve system performance.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.
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