CN218951065U - Water purification system and water purifying and drinking machine - Google Patents
Water purification system and water purifying and drinking machine Download PDFInfo
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- CN218951065U CN218951065U CN202223596957.6U CN202223596957U CN218951065U CN 218951065 U CN218951065 U CN 218951065U CN 202223596957 U CN202223596957 U CN 202223596957U CN 218951065 U CN218951065 U CN 218951065U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 383
- 230000035622 drinking Effects 0.000 title claims abstract description 10
- 238000000746 purification Methods 0.000 title claims description 35
- 230000001954 sterilising effect Effects 0.000 claims abstract description 26
- 239000002351 wastewater Substances 0.000 claims description 17
- 238000004891 communication Methods 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 2
- 241000894006 Bacteria Species 0.000 abstract description 7
- 238000004659 sterilization and disinfection Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 239000008399 tap water Substances 0.000 description 8
- 235000020679 tap water Nutrition 0.000 description 8
- 235000020188 drinking water Nutrition 0.000 description 3
- 239000003651 drinking water Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000008213 purified water Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
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- 239000013589 supplement Substances 0.000 description 1
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Abstract
Description
技术领域technical field
本实用新型涉及净饮设备技术领域,尤其涉及一种净水系统及净饮机。The utility model relates to the technical field of clean drinking equipment, in particular to a water purification system and a clean drinking machine.
背景技术Background technique
净饮设备的水路系统一般包括原水箱、过滤器、纯水箱和出水龙头。The water system of the net drinking equipment generally includes a raw water tank, a filter, a pure water tank and a water outlet tap.
原水箱、过滤器、纯水箱和出水龙头依次通过管路连接。原水箱与自来水路连接,自来水经过过滤器过滤,过滤器过滤后获得的纯水存储在纯水箱中,用户可从出水龙头取水。The raw water tank, the filter, the pure water tank and the water outlet tap are connected through pipelines in sequence. The raw water tank is connected with the tap water, and the tap water is filtered through the filter, and the pure water obtained after filtering through the filter is stored in the pure water tank, and the user can take water from the outlet tap.
过滤器过滤水中有害物质的同时也去除了自来水中用于抑制细菌滋生的氯,这样就导致净水过滤后的纯水更容易滋生细菌,常常导致出水菌落超标。While the filter filters harmful substances in the water, it also removes the chlorine used to inhibit the growth of bacteria in the tap water, which makes the purified water more likely to breed bacteria and often leads to excessive bacterial colonies in the effluent.
为解决该问题,一般会在纯水箱中安装杀菌机构,以对纯水箱中的纯水杀菌。但杀菌机构仅能杀灭纯水箱中细菌,无法杀灭纯水箱与出水龙头之间这段管路内的细菌,其灭菌性能还有待改善。To solve this problem, a sterilizing mechanism is generally installed in the pure water tank to sterilize the pure water in the pure water tank. But the sterilizing mechanism can only kill the bacteria in the pure water tank, but cannot kill the bacteria in the pipeline between the pure water tank and the water outlet, and its sterilizing performance needs to be improved.
有鉴于此,提供一种灭菌性能好的净水系统及净饮机成为必要。In view of this, it is necessary to provide a water purification system and a clean drinking machine with good sterilization performance.
实用新型内容Utility model content
本实用新型的目的在于克服现有技术的不足,提供一种灭菌性能好的净水系统及净饮机。The purpose of the utility model is to overcome the deficiencies of the prior art and provide a water purification system and a drinking water machine with good sterilization performance.
本实用新型技术方案提供一种净水系统,包括原水供给管路、过滤器、纯水箱、加热器、水龙头、第一水泵、第二水泵、换向阀和控制单元;The technical solution of the utility model provides a water purification system, including a raw water supply pipeline, a filter, a pure water tank, a heater, a faucet, a first water pump, a second water pump, a reversing valve and a control unit;
所述第一水泵串联在所述原水供给管路上,所述过滤器与所述原水供给管路连接,所述过滤器连接有废水排出管路;所述过滤器与所述纯水箱之间连接有纯水供给管路;The first water pump is connected in series with the raw water supply pipeline, the filter is connected with the raw water supply pipeline, and the filter is connected with a waste water discharge pipeline; between the filter and the pure water tank Connected with pure water supply pipeline;
所述换向阀包括进水口、第一出水口和第二出水口;The reversing valve includes a water inlet, a first water outlet and a second water outlet;
所述纯水箱与所述进水口之间串联有纯水输出管路;A pure water output pipeline is connected in series between the pure water tank and the water inlet;
所述第二水泵、所述加热器串联在所述纯水输出管路上;The second water pump and the heater are connected in series on the pure water output pipeline;
所述水龙头与所述第一出水口连接;The faucet is connected to the first water outlet;
所述第二出水口与所述纯水供给管路和/或所述纯水输出管路之间连接有纯水回流管路;A pure water return pipeline is connected between the second water outlet and the pure water supply pipeline and/or the pure water output pipeline;
所述加热器、所述第一水泵、第二水泵和换向阀分别与所述控制单元信号连接。The heater, the first water pump, the second water pump and the reversing valve are respectively connected with the control unit for signals.
在其中一项可选技术方案中,所述第二出水口与所述第一水泵之间连接有一条所述纯水回流管路。In one of the optional technical solutions, a pure water return pipeline is connected between the second water outlet and the first water pump.
在其中一项可选技术方案中,所述净水系统包括有原水箱,所述原水供给管路与所述原水箱连接。In one of the optional technical solutions, the water purification system includes a raw water tank, and the raw water supply pipeline is connected to the raw water tank.
在其中一项可选技术方案中,所述废水排出管路与所述原水箱连接。In one of the optional technical solutions, the waste water discharge pipeline is connected to the raw water tank.
在其中一项可选技术方案中,所述纯水供给管路与所述纯水输出管路之间通过连通管连接,所述连通管上设置有连通管阀门,所述连通管阀门与所述控制单元信号连接。In one of the optional technical solutions, the pure water supply pipeline is connected to the pure water output pipeline through a communication pipe, and a communication pipe valve is arranged on the communication pipe, and the communication pipe valve is connected to the The control unit signal connection described above.
在其中一项可选技术方案中,所述加热器的进水端和/或出水端安装有温度传感器,所述温度传感器与所述控制单元信号连接。In one of the optional technical solutions, a temperature sensor is installed at the water inlet end and/or the water outlet end of the heater, and the temperature sensor is connected to the control unit with a signal.
在其中一项可选技术方案中,所述纯水箱的进出水口上连接有进出水管;In one of the optional technical solutions, the water inlet and outlet of the pure water tank are connected with water inlet and outlet pipes;
所述进出水管、所述纯水供给管路及所述纯水输出管路之间通过三通控制阀连接;The water inlet and outlet pipes, the pure water supply pipeline and the pure water output pipeline are connected through a three-way control valve;
所述三通控制阀与所述控制单元信号连接。The three-way control valve is in signal connection with the control unit.
在其中一项可选技术方案中,所述纯水箱上安装有灭菌灯。In one of the optional technical solutions, a sterilization lamp is installed on the pure water tank.
在其中一项可选技术方案中,所述灭菌灯为UV灯。In one of the optional technical solutions, the sterilizing lamp is a UV lamp.
在其中一项可选技术方案中,所述灭菌灯与所述控制单元信号连接。In one of the optional technical solutions, the sterilizing lamp is connected to the control unit by signal.
在其中一项可选技术方案中,所述加热器为厚膜加热器、电热管加热器、陶瓷加热器或石英管加热器。In one of the optional technical solutions, the heater is a thick film heater, an electric tube heater, a ceramic heater or a quartz tube heater.
在其中一项可选技术方案中,所述纯水箱中安装有高水位传感器和低水位传感器,所述高水位传感器和所述低水位传感器分别与所述控制单元信号连接。In one of the optional technical solutions, a high water level sensor and a low water level sensor are installed in the pure water tank, and the high water level sensor and the low water level sensor are respectively connected to the control unit in signal.
本实用新型技术方案还提供一种净饮机,包括前述任一技术方案所述的净水系统。The technical solution of the utility model also provides a drinking water purifier, including the water purification system described in any one of the aforementioned technical solutions.
采用上述技术方案,具有如下有益效果:Adopt above-mentioned technical scheme, have following beneficial effect:
本实用新型提供的净水系统及净饮机,在纯水输出管路上安装有加热器,换向阀的第二出水口与纯水供给管路和/或纯水输出管路之间连接有纯水回流管路,当需要给管路灭菌时,开启加热器将管路中的水加热至预设温度,加热后的水经换向阀、纯水回流管路、纯水供给管路和/或纯水输出管路之间循环流动,以灭除各管路中的细菌,提升了灭菌性能,利于保证用水安全。In the water purification system and drinking water machine provided by the utility model, a heater is installed on the pure water output pipeline, and the second water outlet of the reversing valve is connected with the pure water supply pipeline and/or the pure water output pipeline. Pure water return pipeline, when it is necessary to sterilize the pipeline, turn on the heater to heat the water in the pipeline to the preset temperature, and the heated water passes through the reversing valve, the pure water return pipeline, and the pure water supply pipeline And/or circulation between the pure water output pipelines to eliminate bacteria in each pipeline, improve the sterilization performance, and help ensure water safety.
附图说明Description of drawings
参见附图,本实用新型的公开内容将变得更易理解。应当理解:这些附图仅仅用于说明的目的,而并非意在对本实用新型的保护范围构成限制。图中:Referring to the accompanying drawings, the disclosure of the utility model will become easier to understand. It should be understood that these drawings are only for the purpose of illustration, and are not intended to limit the protection scope of the present utility model. In the picture:
图1为本实用新型第一实施例提供的净水系统的示意图;Fig. 1 is the schematic diagram of the water purification system that the utility model first embodiment provides;
图2为图1所示的净水系统在采用加热器灭菌时的水路流通示意图;Fig. 2 is a schematic diagram of water flow when the water purification system shown in Fig. 1 is sterilized by a heater;
图3为本实用新型第二实施例提供的净水系统的示意图;Fig. 3 is the schematic diagram of the water purification system provided by the second embodiment of the utility model;
图4为本实用新型第三实施例提供的净水系统的示意图;Fig. 4 is the schematic diagram of the water purification system provided by the third embodiment of the utility model;
图5为本实用新型第四实施例提供的净水系统的示意图;Fig. 5 is the schematic diagram of the water purification system provided by the fourth embodiment of the utility model;
图6为图5所示的净水系统在采用加热器灭菌时的水路流通示意图;Fig. 6 is a schematic diagram of the water flow of the water purification system shown in Fig. 5 when a heater is used for sterilization;
图7为本实用新型第五实施例提供的净水系统的示意图;Fig. 7 is the schematic diagram of the water purification system provided by the fifth embodiment of the utility model;
图8为控制单元与各电器元件的信号连接示意图。Fig. 8 is a schematic diagram of the signal connection between the control unit and each electrical component.
具体实施方式Detailed ways
下面结合附图来进一步说明本实用新型的具体实施方式。其中相同的零部件用相同的附图标记表示。需要说明的是,下面描述中使用的词语“前”、“后”、“左”、“右”、“上”和“下”指的是附图中的方向,词语“内”和“外”分别指的是朝向或远离特定部件几何中心的方向。The specific embodiment of the utility model will be further described below in conjunction with the accompanying drawings. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.
如图1-8所示,本实用新型实施例提供的一种净水系统,包括原水供给管路100、过滤器2、纯水箱3、加热器4、水龙头5、第一水泵6、第二水泵7、换向阀8和控制单元9。As shown in Figures 1-8, a water purification system provided by an embodiment of the utility model includes a raw
第一水泵6串联在原水供给管路100上,过滤器2与原水供给管路100连接,过滤器2连接有废水排出管路200。过滤器2与纯水箱3之间连接有纯水供给管路300。The
换向阀8包括进水口81、第一出水口82和第二出水口83。The reversing
纯水箱3与进水口81之间串联有纯水输出管路400。A pure
第二水泵7、加热器4串联在纯水输出管路400上。The
水龙头5与第一出水口82连接。The faucet 5 is connected with the
第二出水口83与纯水供给管路300和/或纯水输出管路400之间连接有纯水回流管路500。A pure
加热器4、第一水泵6、第二水泵7和换向阀8分别与控制单元9信号连接。The
本实用新型中的原水是指自来水,纯水是指自来水经过滤后得到的纯净水。本实用新型中所指的阀门为电磁阀,可由控制机构自动控制开关。Raw water in the utility model refers to tap water, and pure water refers to purified water obtained after tap water is filtered. The valve referred to in the utility model is a solenoid valve, which can be automatically controlled by a control mechanism.
本实用新型提供的净水系统用于净饮机中,其包括原水供给管路100、过滤器2、纯水箱3、加热器4、水龙头5、第一水泵6、第二水泵7、换向阀8和控制单元9。The water purification system provided by the utility model is used in a drinking machine, and it includes a raw
原水供给管路100与自来水管路连接。第一水泵6串联在原水供给管路100上。过滤器2处于第一水泵6的下游,过滤器2的进水口原水供给管路100连接。原水供给管路100上安装有第一控制阀和原水TDS传感器。第一水泵6、第一控制阀和原水TDS传感器分别与控制单元9信号连接。控制单元9为控制器、处理器等。由控制单元9控制第一水泵6、第一控制阀的自动开关。原水TDS传感器监测的原水的TDS。TDS为溶解性固体总量(Total dissolvedsolids)的英文缩写,TDS值越高,表示水中含有的溶解物越多。纯水的TDS值范围一般在10—50之间。The raw
在第一水泵6的作用下,将原水输送至过滤器2中进行过滤。过滤后会得到纯净水和废水。Under the action of the
废水回收管路200与过滤器2的回水口连接,在废水回收管路200上安装有第二控制阀和废水TDS传感器。第二控制阀和废水TDS传感器分别与控制单元9信号连接。由控制单元9控制第二控制阀的自动开关。The
过滤器2中产生的废水经废水回收管路200排出至指定位置,例如蓄水池、水箱等。需要说明的是,该处所指的废水仅指TDS值稍高(例如,高于50)的水,该废水还可继续作为它用或重复过滤为纯水,并不代表不能使用的污水。The waste water generated in the
过滤器2的出水口与纯水箱3的进水口之间连接有纯水供给管路300,过滤器2中产生的纯净水输送至纯水箱3中进行存储。A pure
纯水箱3的出水口与换向阀8的进水口81之间连接有纯水输出管路400,水龙头5与换向阀8的第一出水口82连接。第二水泵7和加热器4顺次连接在纯水输出管路400上。纯水输出管路400上可安装流量计。第二水泵7和加热器4分别与控制单元9信号连接。由控制单元9控制第二水泵7和加热器4的自动开关。A pure
用户可从水龙头5取水。取水时,第二水泵7开启,加热器4根据需要开启或关闭,以供给热水或凉水,纯水经纯水输出管路400、第二水泵7、加热器4后从水龙头5流出。The user can get water from the faucet 5 . When taking water, the
在换向阀8的第二出水口83与纯水供给管路300和/或纯水输出管路400之间连接有纯水回流管路500,用于加热后的纯水回流,以加热各管路灭菌。Between the
如图1-2所示,在第二出水口83与纯水输出管路400之间连接有纯水回流管路500。在需要给管路灭菌时,水龙头5关闭,第二水泵7和加热器4开启,加热器4可将纯水加热至60℃以上。热水在纯水输出管路400和纯水回流管路500中循环流动,以对管路灭菌。As shown in FIGS. 1-2 , a pure
如图3和图5-6所示,在第二出水口83与纯水供给管路300之间连接有纯水回流管路500。在需要给管路灭菌时,水龙头5关闭,第二水泵7和加热器4开启,加热器4可将纯水加热至60℃以上。热水在纯水供给管路300、纯水输出管路400和纯水回流管路500中循环流动,以对管路灭菌。As shown in FIG. 3 and FIGS. 5-6 , a pure
如图4所示,在第二出水口83与纯水供给管路300和纯水输出管路400之间分别连接有纯水回流管路500。纯水回流管路500上安装有第三控制阀501,第三控制阀501与控制单元9信号连接。由控制单元9控制As shown in FIG. 4 , pure
各第三控制阀501的自动开关,以控制各纯水回流管路500的开关。通过5控制相应的第三控制阀501,可实现加热的热水在纯水输出管路400和纯The automatic switch of each
水回流管路500中循环流动,或实现加热的热水在纯水供给管路300、纯水输出管路400和纯水回流管路500中循环流动。The water circulates in the
综上所述,本实用新型提供的净水系统,在纯水输出管路400上安装有加热器4,换向阀8的第二出水口83与纯水供给管路300和/或纯水输0出管路400之间连接有纯水回流管路500,当需要给管路灭菌时,开启加热器4将管路中的水加热至预设温度,加热后的水经换向阀8、纯水回流管路500、纯水供给管路300和/或纯水输出管路400之间循环流动,以灭除各管路中的细菌,提升了灭菌性能,利于保证用水安全。In summary, the water purification system provided by the utility model is equipped with a
在其中一个实施例中,如图7所示,第二出水口83与第一水泵6之5间连接有一条纯水回流管路500。In one embodiment, as shown in FIG. 7 , a pure
本实施例中,在第一水泵6的进水口与换向阀8的第二出水口83之间也连接有一条纯水回流管路500,以对过滤器2灭菌。In this embodiment, a pure
纯水回流管路500上配置有第三控制阀501,第三控制阀501与控制单元9信号连接。A
具体地,纯水回流管路500可与原水供给管路100连接,连接点处于Specifically, the pure
第一水泵6的上游。Upstream of the
当需要给过滤器2灭菌时,开启加热器4将管路中的水加热至预设温度,加热后的水经换向阀8、纯水回流管路500、第一水泵6后进入过滤器2内,然后经纯水供给管路300、纯水输出管路400至加热器4循环流动。When the
在其中一个实施例中,如图1-7所示,净水系统包括有原水箱1,原水供给管路100与原水箱1连接。In one embodiment, as shown in FIGS. 1-7 , the water purification system includes a raw water tank 1 , and a raw
本实施例中,在原水供给管路100的上游配置有原水箱1,原水箱1用于与自来水管路连接,原水箱1起到蓄水、缓冲、沉降作用。In this embodiment, a raw water tank 1 is arranged upstream of the raw
在其中一个实施例中,如图1-7所示,废水排出管路200与原水箱1连接。In one of the embodiments, as shown in FIGS. 1-7 , the waste
本实施例中,废水排出管路200排出的废水回流至原水箱1,然后与原水/自来水混合后,再经过滤器2过滤,起到节约用水的作用。In this embodiment, the waste water discharged from the waste
在其中一个实施例中,如图3-4所示,纯水供给管路300与纯水输出管路400之间通过连通管600连接,连通管600上设置有连通管阀门601,连通管阀门601与控制单元9信号连接。In one of the embodiments, as shown in Fig. 3-4, the pure
本实施例中,在通过加热器4加热时,将连通管阀门601开启,以将纯水供给管路300与纯水输出管路400连通,便于实现加热的热水在纯水供给管路300、纯水输出管路400和纯水回流管路500中循环流动。In this embodiment, when heating by the
在其中一个实施例中,如图1-6所示,加热器4的进水端和/或出水端安装有温度传感器41,温度传感器41与控制单元9信号连接。In one embodiment, as shown in FIGS. 1-6 , a
温度传感器41用于监测水温,以判断是否满足灭菌要求。The
在用户选择管路灭菌模式后,加热器4开启。当加热器4的进水端的温度传感器41监测到进入加热器的水温低于60℃时,则保持开启加热器4。当加热器4的出水端的温度传感器41监测到流出加热器的水温高于预设温度(例如,80℃)时,则关闭加热器4。After the user selects the pipeline sterilization mode, the
在其中一个实施例中,如图5-6所示,纯水箱3的进出水口30上连接有进出水管31。In one embodiment, as shown in FIGS. 5-6 , the water inlet and
进出水管31、纯水供给管路300及纯水输出管路400之间通过三通控制阀32连接。The water inlet and
三通控制阀32与控制单元9信号连接。The three-
本实施例中,纯水箱3采用一个进出口与纯水供给管路300及纯水输出管路400连接。具体地,进出水口30上连接有进出水管31,进出水管31、纯水供给管路300及纯水输出管路400之间通过三通控制阀32连接切换,三通控制阀32与控制单元9信号连接,由控制单元9控制三通控制阀32的三个阀口的开关。In this embodiment, the
当纯水供给管路300向纯水箱3中供给纯水时,三通控制阀32与纯水输出管路400连接的阀口关闭。When the pure
当纯水箱3向纯水输出管路400输出纯水时,三通控制阀32与纯水供给管路300连接的阀口关闭。When the
当对管路加热灭菌上,三通控制阀32与进出水管31连接的阀口关闭,热水在纯水回流管路500、纯水供给管路300和纯水输出管路400之间循环流动。When heating and sterilizing the pipeline, the valve port connecting the three-
在其中一个实施例中,如图1-6所示,纯水箱3上安装有灭菌灯33,用于给纯水箱3中的纯水灭菌。In one embodiment, as shown in FIGS. 1-6 , a
在其中一个实施例中,灭菌灯33为UV灯,技术成熟,灭菌效果好。In one of the embodiments, the
在其中一个实施例中,如图7所示,灭菌灯33与控制单元9信号连接,由控制单元9控制灭菌灯33的自动开关。根据需要,可设置定时灭菌,例如每隔4-5小时,灭菌一次。In one of the embodiments, as shown in FIG. 7 , the sterilizing
在其中一个实施例中,加热器4为厚膜加热器、电热管加热器、陶瓷加热器或石英管加热器,选择多,适用范围广。在其中一个实施例中,如图1-7所示,纯水箱3中安装有高水位传感器34和低水位传感器35,高水位传感器34和低水位传感器35分别与控制单元9信号连接。In one of the embodiments, the
当低水位传感器35监测到水位低于预设低水位时,向控制单元9发出信号,第一水泵6自动开启,向纯水箱3中补充纯水。当高水位传感器34监测到水位高于预设高水位时,向控制单元9发出信号,第一水泵6自动关闭。When the low
本实用新型一实施例提供一种净饮机,包括前述任一实施例所述的净水系统,净水系统的全部或局部安装在净饮机的机体中。An embodiment of the utility model provides a drinking machine, which includes the water purification system described in any one of the above embodiments, and all or part of the water purification system is installed in the body of the drinking machine.
根据需要,可以将上述各技术方案进行结合,以达到最佳技术效果。According to needs, the above technical solutions can be combined to achieve the best technical effect.
以上的仅是本实用新型的原理和较佳的实施例。应当指出,对于本领域的普通技术人员来说,在本实用新型原理的基础上,还可以做出若干其它变型,也应视为本实用新型的保护范围。The above are only principles and preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, several other modifications can be made on the basis of the principle of the utility model, which should also be regarded as the protection scope of the utility model.
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