CN108680375B - Vacuum refrigeration performance test experimental device - Google Patents
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 36
- 238000011056 performance test Methods 0.000 title claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 239000000523 sample Substances 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 8
- 239000008399 tap water Substances 0.000 claims description 5
- 235000020679 tap water Nutrition 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000003507 refrigerant Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims 2
- 238000009833 condensation Methods 0.000 claims 2
- 238000002474 experimental method Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000013480 data collection Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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Abstract
Description
技术领域Technical field
本发明涉及一种真空制冷性能测试实验装置，属于制冷设备领域。The invention relates to a vacuum refrigeration performance testing experimental device, belonging to the field of refrigeration equipment.
背景技术Background technique
在制冷设备领域，真空制冷是一种比较独特的制冷方法，其运行机理完全不同于目前市面上常用的其他制冷方式，但是它是一种非常理想的预冷技术，是目前降温最快的一种制冷技术，可以应用在花卉、水果等保鲜领域中。正因为其比较冷门，因此目前对它的认识还不够深入，对其运行机理的分析不够深入。但是作为一种制冷设备，能效比是不可回避的一项重要指标，对真空制冷来说，其真空泵的耗能较大，而且其制冷量在很大程度上和花卉、水果这些富含水分的冷却对象的蒸发量直接相关，同时这些冷却对象的初始冷却条件是不同的，在不同的工况条件下如何准确测定真空制冷量对测定真空冷却装置的能效比非常重要。In the field of refrigeration equipment, vacuum refrigeration is a relatively unique refrigeration method. Its operating mechanism is completely different from other refrigeration methods commonly used on the market. However, it is a very ideal pre-cooling technology and is currently the fastest cooling method. This kind of refrigeration technology can be applied in the fields of freshness preservation such as flowers and fruits. Precisely because it is relatively unpopular, the current understanding of it is not deep enough, and the analysis of its operating mechanism is not deep enough. However, as a kind of refrigeration equipment, energy efficiency ratio is an important indicator that cannot be avoided. For vacuum refrigeration, the vacuum pump consumes a lot of energy, and its cooling capacity is largely the same as that of flowers and fruits that are rich in moisture. The evaporation capacity of the cooling objects is directly related. At the same time, the initial cooling conditions of these cooling objects are different. How to accurately measure the vacuum cooling capacity under different working conditions is very important for determining the energy efficiency ratio of the vacuum cooling device.
发明内容Contents of the invention
本发明要解决的技术问题是，提供一种准确测定真空制冷量对测定真空冷却装置的能效比的真空制冷性能测试实验装置。The technical problem to be solved by the present invention is to provide a vacuum refrigeration performance testing experimental device for accurately measuring the vacuum refrigeration capacity to the energy efficiency ratio of the vacuum cooling device.
为解决上述技术问题，本发明采用的技术方案为：In order to solve the above technical problems, the technical solutions adopted by the present invention are:
一种真空制冷性能测试实验装置，包括真空箱，所述真空箱内设置有压力传感器和湿度传感器，所述真空箱内腔上部设置有捕水器，所述捕水器连有制冷系统，所述真空箱连有真空系统，所述捕水器设置有捕水器进气口和捕水器出水口，所述捕水器出水口与所述集水箱上端相连，所述集水箱下端通过第一阀门与冷凝水计量罐相连，所述冷凝水计量罐的下端设置有第一泄水阀，所述冷凝水计量罐内下面设置有第一温度探头，所述真空箱下面通过第三阀门与剩余水计量罐上端相连，所述剩余水计量罐下端设置有第二泄水阀，所述剩余水计量罐内下面设置有第五温度探头，冷却计量罐下端通过第二阀门与所述真空箱相连，所述冷却计量罐内设置有第二温度探头和电加热器，所述第一温度探头、第二温度探头、第三温度探头、第四温度探头、第五温度探头、压力传感器和湿度传感器分别与数据采集终端相连。A vacuum refrigeration performance testing experimental device includes a vacuum box. A pressure sensor and a humidity sensor are provided in the vacuum box. A water catcher is provided on the upper part of the inner cavity of the vacuum box. The water catcher is connected to a refrigeration system. The vacuum box is connected with a vacuum system, and the water catcher is provided with a water catcher air inlet and a water catcher water outlet. The water catcher outlet is connected to the upper end of the water collecting box, and the lower end of the water collecting box passes through the third A valve is connected to the condensed water metering tank. A first drain valve is provided at the lower end of the condensed water metering tank. A first temperature probe is provided below the condensed water metering tank. The vacuum box is connected to the bottom through a third valve. The upper end of the residual water metering tank is connected, the lower end of the residual water metering tank is provided with a second drain valve, the lower end of the residual water metering tank is provided with a fifth temperature probe, and the lower end of the cooling metering tank is connected to the vacuum box through the second valve. Connected, the cooling metering tank is provided with a second temperature probe and an electric heater, the first temperature probe, the second temperature probe, the third temperature probe, the fourth temperature probe, the fifth temperature probe, the pressure sensor and the humidity The sensors are connected to data collection terminals respectively.
所述制冷系统包括依次连接的压缩机、冷凝器和膨胀阀，所述压缩机和膨胀阀与所述捕水器相连。The refrigeration system includes a compressor, a condenser and an expansion valve connected in sequence, and the compressor and the expansion valve are connected to the water catcher.
所述压缩机、冷凝器、膨胀阀和捕水器之间通过铜管连接。The compressor, condenser, expansion valve and water trap are connected through copper pipes.
所述压缩机、冷凝器、膨胀阀和捕水器采用R134A制冷剂。The compressor, condenser, expansion valve and water catcher use R134A refrigerant.
所述真空系统包括气液分离器，所述气液分离器的进气口连有所述真空箱，所述气液分离器的出气口依次连有真空阀和真空泵，所述液分离器的出水口与所述集水箱下端相连。The vacuum system includes a gas-liquid separator. The air inlet of the gas-liquid separator is connected to the vacuum box. The air outlet of the gas-liquid separator is connected to a vacuum valve and a vacuum pump in turn. The water outlet is connected to the lower end of the water collection tank.
所述冷却计量罐侧面上端通过设置自来水阀门实现注水。The upper end of the side of the cooling metering tank is provided with a tap water valve to realize water filling.
本发明的有益效果：本发明提供的一种真空制冷性能测试实验装置，利用该装置，可以通过改变加热量来模拟不同初始温度条件下的冷却对象，通过对进入装置的热水量及其温度测定、处理达到设定温度后的剩余冷水量及其温度测定、捕获水量及其温度测定，结合压缩机耗能数据、真空泵耗能数据，在计算机中借助另行开发的软件程序对采集数据进行分析计算，可以自动生成相关数据、计算对应能效比数据、分析能效比在不同工况条件下的变化趋势等。Beneficial effects of the present invention: The present invention provides a vacuum refrigeration performance test experimental device. With this device, cooling objects under different initial temperature conditions can be simulated by changing the amount of heating. By measuring the amount of hot water entering the device and its temperature Measure and process the remaining cold water volume and temperature measurement after reaching the set temperature, capture water volume and temperature measurement, combine the compressor energy consumption data, vacuum pump energy consumption data, and analyze the collected data in the computer with the help of a separately developed software program Calculation can automatically generate relevant data, calculate corresponding energy efficiency ratio data, analyze the changing trend of energy efficiency ratio under different working conditions, etc.
附图说明Description of the drawings
图1为本发明的一种真空制冷性能测试实验装置结构示意图。Figure 1 is a schematic structural diagram of a vacuum refrigeration performance testing experimental device of the present invention.
图中附图标记如下：1-压缩机；2-冷凝器；3-膨胀阀；4-捕水器；5-捕水器进气口；6-捕水器出水口；7-集水箱；8-第一阀门；9-冷凝水计量罐；10-第一泄水阀；11-气液分离器；12-真空阀；13-真空泵；14-第一温度探头；15-第二温度探头；16-第三温度探头；17-压力传感器；18-湿度传感器；19-第四温度探头；20-第五温度探头；21-数据采集终端；22-自来水阀门；23-冷却计量罐；24-电加热器；25-第二阀门；26-第二泄水阀；27-剩余水计量罐；28-第三阀门；29-真空箱。The reference numbers in the figure are as follows: 1-Compressor; 2-Condenser; 3-Expansion valve; 4-Water catcher; 5-Water catcher air inlet; 6-Water catcher outlet; 7-Water collecting tank; 8-first valve; 9-condensate metering tank; 10-first drain valve; 11-gas-liquid separator; 12-vacuum valve; 13-vacuum pump; 14-first temperature probe; 15-second temperature probe ; 16-The third temperature probe; 17-Pressure sensor; 18-Humidity sensor; 19-The fourth temperature probe; 20-The fifth temperature probe; 21-Data acquisition terminal; 22-Tap water valve; 23-Cooling metering tank; 24 - Electric heater; 25-second valve; 26-second drain valve; 27-remaining water metering tank; 28-third valve; 29-vacuum box.
具体实施方式Detailed ways
下面结合附图对本发明作进一步描述，以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but cannot be used to limit the scope of protection of the present invention.
如图1所示，一种真空制冷性能测试实验装置，包括真空箱29，用于保证箱内负压时具有很好的密封性。真空箱29内设置有压力传感器17和湿度传感器18，分别用于获取真空箱29内获取压力值和湿度值，真空箱29内腔上部设置有捕水器4，捕水器4连有制冷系统。制冷系统包括依次连接的压缩机1、冷凝器2和膨胀阀3，压缩机1和膨胀阀3与捕水器4相连。压缩机1、冷凝器2、膨胀阀3和捕水器4之间通过铜管连接。压缩机1、冷凝器2、膨胀阀3和捕水器4采用R134A制冷剂，制冷蒸发温度在0℃到-25℃内可调，构成制冷循环。不同的膨胀阀3工况可以提供不同的制冷蒸发温度，为捕水器4提供冷源，从而使流经捕水器4的水蒸气可以被冷凝为液态水落入集水箱7中。As shown in Figure 1, a vacuum refrigeration performance testing experimental device includes a vacuum box 29, which is used to ensure good sealing when there is negative pressure in the box. The vacuum box 29 is provided with a pressure sensor 17 and a humidity sensor 18, which are respectively used to obtain the pressure value and humidity value in the vacuum box 29. A water catcher 4 is provided at the upper part of the inner cavity of the vacuum box 29, and the water catcher 4 is connected to a refrigeration system. . The refrigeration system includes a compressor 1, a condenser 2 and an expansion valve 3 connected in sequence. The compressor 1 and the expansion valve 3 are connected to the water catcher 4. Compressor 1, condenser 2, expansion valve 3 and water catcher 4 are connected by copper pipes. Compressor 1, condenser 2, expansion valve 3 and water catcher 4 use R134A refrigerant, and the refrigeration evaporation temperature is adjustable from 0°C to -25°C, forming a refrigeration cycle. Different operating conditions of the expansion valve 3 can provide different refrigeration evaporation temperatures and provide a cold source for the water catcher 4, so that the water vapor flowing through the water catcher 4 can be condensed into liquid water and fall into the water collection tank 7.
真空箱29连有真空系统，真空系统包括气液分离器11，气液分离器11的进气口连有真空箱29，气液分离器11的出气口依次连有真空阀12和真空泵13，液分离器11的出水口与集水箱7下端相连。气液分离器作用是真空泵的保护装置，当捕水器4未能百分百捕获水蒸气时，保证汽水分离效果达到95％以上。真空阀12的作用是和真空泵13的启停同步，当真空泵13停止工作时，真空阀12能自动将真空系统封闭，避免真空泵润滑油返流污染真空系统.The vacuum box 29 is connected to a vacuum system. The vacuum system includes a gas-liquid separator 11. The air inlet of the gas-liquid separator 11 is connected to the vacuum box 29. The air outlet of the gas-liquid separator 11 is connected to a vacuum valve 12 and a vacuum pump 13 in turn. The water outlet of the liquid separator 11 is connected to the lower end of the water collecting tank 7 . The gas-liquid separator functions as a protection device for the vacuum pump. When the water catcher 4 fails to capture 100% of the water vapor, it ensures that the steam-water separation effect reaches more than 95%. The function of the vacuum valve 12 is to synchronize the start and stop of the vacuum pump 13. When the vacuum pump 13 stops working, the vacuum valve 12 can automatically close the vacuum system to prevent the backflow of vacuum pump lubricating oil from contaminating the vacuum system.
捕水器4设置有捕水器进气口5和捕水器出水口6，真空箱29中的气体通过捕水器进气口5进入捕水器4，捕水器4中凝结后的液态水通过捕水器出水口6进入集水箱7。捕水器出水口6与集水箱7上端相连，集水箱7下端通过第一阀门8与冷凝水计量罐9相连。第一阀门8在真空泵13工作时关闭，真空泵13停止时打开，冷凝水可以进入计量罐9。The water catcher 4 is provided with a water catcher air inlet 5 and a water catcher outlet 6. The gas in the vacuum box 29 enters the water catcher 4 through the water catcher air inlet 5. The condensed liquid in the water catcher 4 Water enters the water collection tank 7 through the water catcher outlet 6. The water catcher outlet 6 is connected to the upper end of the water collecting tank 7, and the lower end of the water collecting tank 7 is connected to the condensed water metering tank 9 through the first valve 8. The first valve 8 is closed when the vacuum pump 13 is working and opened when the vacuum pump 13 is stopped, so that the condensed water can enter the metering tank 9 .
冷凝水计量罐9的下端设置有第一泄水阀10，冷凝水计量罐9内下面设置有第一温度探头14，真空箱29下面通过第三阀门28与剩余水计量罐27上端相连，剩余水计量罐27下端设置有第二泄水阀26，剩余水计量罐27内下面设置有第五温度探头20，冷却计量罐23下端通过第二阀门25与真空箱29相连。A first drain valve 10 is provided at the lower end of the condensate water metering tank 9. A first temperature probe 14 is provided below the condensate water metering tank 9. The bottom of the vacuum box 29 is connected to the upper end of the remaining water metering tank 27 through a third valve 28. A second drain valve 26 is provided at the lower end of the water metering tank 27, and a fifth temperature probe 20 is provided below the remaining water metering tank 27. The lower end of the cooling metering tank 23 is connected to the vacuum box 29 through the second valve 25.
剩余水计量罐27和冷却计量罐23分别用于准确计量冷却后剩余水量和准确计量冷凝水量。冷却计量罐23内设置有第二温度探头15和电加热器24，冷却计量罐23侧面上端通过设置自来水阀门22实现注水。第一温度探头14、第二温度探头15、第三温度探头16、第四温度探头19、第五温度探头20、压力传感器17和湿度传感器18分别与数据采集终端21相连，将采集到的数据传输给数据采集终端21进行分析处理。The remaining water metering tank 27 and the cooling metering tank 23 are respectively used to accurately measure the amount of residual water after cooling and the amount of condensed water. The cooling metering tank 23 is provided with a second temperature probe 15 and an electric heater 24. A tap water valve 22 is provided at the upper end of the side of the cooling metering tank 23 to achieve water filling. The first temperature probe 14, the second temperature probe 15, the third temperature probe 16, the fourth temperature probe 19, the fifth temperature probe 20, the pressure sensor 17 and the humidity sensor 18 are respectively connected to the data acquisition terminal 21 to collect the collected data. Transmitted to the data collection terminal 21 for analysis and processing.
本发明对应能效比测量原理是，消耗的电量很容易获取，只要给真空泵装个电表即可，但是对应的制冷量的获取必须依靠间接的方法。根据工程热力学水和水蒸气特性，一定压力下的水要变成水蒸气，需要吸收大量的汽化潜热，这个数值比和温度变化相关的显热要高得多，那么进入真空箱的高温水量和制冷达到设定温度后的剩余水量之间的差就是真空箱中蒸发的水量，这样就可以结合水和水蒸气图表后计算得出真空制冷量的数值。而这个蒸发的水量在捕水器中又被图示的蒸汽压缩式制冷装置捕获了并可以进行测量，通过制冷压缩机的耗电量结合制冷装置的反向推算可以与刚才的数据进行验证对比，这在通常的蒸汽压缩式制冷装置计算中非常简单的，在制冷空调设计手册中就有相应范例。The energy efficiency ratio measurement principle of the present invention is that the consumed electricity is easy to obtain, as long as an electric meter is installed on the vacuum pump, but the corresponding cooling capacity must be obtained through indirect methods. According to the characteristics of engineering thermodynamic water and water vapor, water under a certain pressure needs to absorb a large amount of latent heat of vaporization to turn into water vapor. This value is much higher than the sensible heat related to temperature changes, so the amount of high-temperature water entering the vacuum box and The difference between the remaining water volume after cooling reaches the set temperature is the amount of water evaporated in the vacuum box. In this way, the value of the vacuum cooling capacity can be calculated by combining the water and water vapor charts. This evaporated water volume is captured by the vapor compression refrigeration device in the water trap and can be measured. The power consumption of the refrigeration compressor combined with the reverse calculation of the refrigeration device can be verified and compared with the data just now. , which is very simple in the calculation of common vapor compression refrigeration devices, and there are corresponding examples in the refrigeration and air-conditioning design manual.
本发明的工作过程为：装置运行之前，图中所有的阀门均处于关闭状态。The working process of the present invention is: before the device is operated, all valves in the figure are in a closed state.
打开自来水阀门，可以往冷却计量罐中注入确定数量的水，启动电加热器可以将水温加热到某特定工况。水温恒定后关闭电加热器，打开第二阀门可以往真空箱中注入确定数量的水，然后关闭第二阀门，注水步骤完成。Opening the tap water valve can inject a certain amount of water into the cooling metering tank, and starting the electric heater can heat the water temperature to a specific working condition. After the water temperature is constant, turn off the electric heater, open the second valve to inject a certain amount of water into the vacuum box, and then close the second valve to complete the water injection step.
开启压缩机，制冷循环开始工作，完成捕水器的准备工作。Turn on the compressor, the refrigeration cycle starts to work, and the preparation of the water catcher is completed.
开启真空泵，真空阀同步打开，真空箱内压力降低至某一设定值，捕水器位于真空箱上部，内部设置折流板，其出气口经气液分离器、真空阀与真空泵相通，在真空泵抽气所产生压差的作用下，真空箱内的水蒸气流入捕水器被低温蒸发管捕集冷凝成水，冷凝水在重力作用下流入集水箱内。Turn on the vacuum pump, open the vacuum valve synchronously, and reduce the pressure in the vacuum box to a certain set value. The water catcher is located at the top of the vacuum box, with a baffle installed inside. Its outlet is connected to the vacuum pump through the gas-liquid separator, vacuum valve, and Under the action of the pressure difference generated by the vacuum pump, the water vapor in the vacuum box flows into the water catcher and is captured by the low-temperature evaporation tube and condensed into water. The condensed water flows into the water collection tank under the action of gravity.
当真空箱达到设定压力时后一段时间，当第三温度探头检测到真空箱内水温冷却至设定温度后，关闭真空泵，真空阀同步关闭，压缩机继续运行一分钟后关闭。When the vacuum box reaches the set pressure, a period of time later, when the third temperature probe detects that the water temperature in the vacuum box has cooled to the set temperature, the vacuum pump is turned off, the vacuum valve is closed synchronously, and the compressor continues to run for one minute and then turns off.
打开第三阀门，真空箱内剩余的已达到冷却温度的水流入剩余水计量罐，可以准确读出其水量。Open the third valve, and the remaining water in the vacuum box that has reached the cooling temperature flows into the remaining water metering tank, and the water volume can be accurately read.
打开第一阀门，集水箱及气液分离器下部的水流入冷凝水计量罐，可以准确读出其水量。Open the first valve, the water in the water collection tank and the lower part of the gas-liquid separator flows into the condensed water metering tank, and the water volume can be accurately read.
以上过程中需要测量的温度值、压力值、湿度值均通过相应部位的探头或传感器感知后传送至数据采集终端，具体为计算机。The temperature values, pressure values, and humidity values that need to be measured in the above process are sensed by probes or sensors in corresponding parts and then transmitted to the data collection terminal, specifically a computer.
根据被冷却对象的水量、水温；冷却后剩余水的水量、水温；冷凝水水量、水温；利用水在对应压力下的汽化潜热值、不同温度下的显热变化值，再结合压缩机的耗电量数据、真空泵的耗电量数据，对图中各部件进行相应计算，可以得到对应工况下的制冷量和能效比。再改变被冷却水的初始温度、膨胀阀的节流工况、真空泵抽取后真空箱的不同压力，可以得到一系列不同数据以供分析用。According to the water volume and water temperature of the object to be cooled; the water volume and water temperature of the remaining water after cooling; the condensed water volume and water temperature; the latent heat value of vaporization of water under corresponding pressure and the sensible heat change value at different temperatures are used, combined with the consumption of the compressor. According to the power data and the power consumption data of the vacuum pump, the cooling capacity and energy efficiency ratio under the corresponding working conditions can be obtained through corresponding calculations of each component in the figure. By changing the initial temperature of the cooled water, the throttling conditions of the expansion valve, and the different pressures of the vacuum box after the vacuum pump is extracted, a series of different data can be obtained for analysis.
以上所述仅是本发明的优选实施方式，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 are only preferred embodiments of the present invention. For those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as protection scope of the present invention.
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