CN221662665U - Oil-water filter - Google Patents
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- CN221662665U CN221662665U CN202420098170.7U CN202420098170U CN221662665U CN 221662665 U CN221662665 U CN 221662665U CN 202420098170 U CN202420098170 U CN 202420098170U CN 221662665 U CN221662665 U CN 221662665U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 238000003756 stirring Methods 0.000 claims abstract description 45
- 239000010865 sewage Substances 0.000 claims abstract description 27
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims abstract 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 8
- 239000003814 drug Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 4
- 239000011148 porous material Substances 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 239000010802 sludge Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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Abstract
Description
技术领域Technical Field
本实用新型涉及含油污水处理技术领域，具体涉及一种油水过滤器。The utility model relates to the technical field of oily sewage treatment, in particular to an oil-water filter.
背景技术Background Art
含油污泥主要指在原油开采，储存，集输，加工等生产过程中产生的固体废弃物，包括落地油泥、清罐油泥、浮渣底泥、脱水钻井泥浆。含油污泥是石油生产过程的主要污染源之一。这些含油污泥的产生量随油气田开发逐年增加，给生产企业及当地生态保护带来了严重的环境压力，迫切需要科学、高效、环保新的技术和治理方案彻底解决含油污泥的污染难题。而现有的含油污水在处理时，通常只能采用离心方式将油、水分离，处理效率较低，且在处理污水过程中，油污会大量沾附在设备内壁，不方便清洗和维护。Oily sludge mainly refers to solid waste generated during the production process of crude oil extraction, storage, gathering, transportation, and processing, including ground sludge, tank cleaning sludge, scum sludge, and dehydrated drilling mud. Oily sludge is one of the main sources of pollution in the oil production process. The amount of these oily sludges has increased year by year with the development of oil and gas fields, which has brought serious environmental pressure to production companies and local ecological protection. Scientific, efficient, and environmentally friendly new technologies and treatment solutions are urgently needed to completely solve the pollution problem of oily sludge. When treating existing oily wastewater, usually only centrifugal separation of oil and water is used, and the treatment efficiency is low. In the process of treating wastewater, a large amount of oil will adhere to the inner wall of the equipment, which is inconvenient to clean and maintain.
实用新型内容Utility Model Content
本实用新型的目的就在于为了解决上述问题而提供一种油水过滤器，本实用新型提供的诸多技术方案中优选的技术方案具有：含油污水处理效果好，操作便捷，方便清洁维护等技术效果，详见下文阐述。The purpose of the present invention is to provide an oil-water filter in order to solve the above-mentioned problems. The preferred technical solution among the many technical solutions provided by the present invention has the following technical effects: good oily wastewater treatment effect, convenient operation, convenient cleaning and maintenance, etc., as described below for details.
为实现上述目的，本实用新型提供了以下技术方案：In order to achieve the above purpose, the utility model provides the following technical solutions:
本实用新型提供的一种油水过滤器，包括壳体、上封头和下封头，所述上封头和下封头分别设置在所述壳体的顶部和底部，且与所述壳体焊接配合；The utility model provides an oil-water filter, comprising a shell, an upper head and a lower head, wherein the upper head and the lower head are respectively arranged at the top and the bottom of the shell, and are welded with the shell;
所述上封头的顶部中间设置有搅拌装置，该搅拌装置贯穿所述上封头后插入所述壳体内部，所述上封头上设置有进水口，所述上封头内部设置有散布污水的布水组件，该进水组件与所述进水口连通，所述上封头上设置有加药口和出油口；A stirring device is provided in the middle of the top of the upper head, and the stirring device penetrates the upper head and is inserted into the shell. A water inlet is provided on the upper head, and a water distribution component for dispersing sewage is provided inside the upper head, and the water inlet component is connected to the water inlet. A dosing port and an oil outlet are provided on the upper head;
所述壳体内部设置有过滤孔板，该过滤孔板的上方设置有滤料；A filter plate is disposed inside the housing, and filter material is disposed above the filter plate;
所述下封头的底部设置有若干条支腿，所述下封头的下部设置有初滤出口、出水口和排污口。The bottom of the lower head is provided with a plurality of supporting legs, and the lower part of the lower head is provided with a primary filter outlet, a water outlet and a sewage outlet.
作为优选，所述搅拌装置的下部设置有搅拌轴，该搅拌轴下端插入所述壳体内部，且所述搅拌轴的端部设置有搅拌桨，所述上封头内部对应所述搅拌轴设置有轴支撑结构。Preferably, a stirring shaft is provided at the lower portion of the stirring device, the lower end of the stirring shaft is inserted into the interior of the shell, and a stirring paddle is provided at the end of the stirring shaft, and a shaft support structure is provided inside the upper head corresponding to the stirring shaft.
作为优选，所述轴支撑结构由中心管和支撑架组成，所述中心管的上端与所述上封头内侧的顶部连接，所述支撑架设置在所述中心管的下部，且所述支撑架的端部与所述上封头的内壁连接；所述上封头的顶部设置有配合所述搅拌装置固定的凸缘法兰。Preferably, the shaft support structure consists of a center tube and a support frame, the upper end of the center tube is connected to the top of the inner side of the upper head, the support frame is arranged at the lower part of the center tube, and the end of the support frame is connected to the inner wall of the upper head; the top of the upper head is provided with a flange flange which is fixed to cooperate with the stirring device.
作为优选，所述布水组件由若干条不锈钢筛管、筛管支架和汇管组成，所述汇管与所述进水口连通，所述不锈钢筛管布设在所述汇管的两侧，且均与所述汇管连通；所述筛管支架设置有两条，且分列在所述汇管的两侧，所述不锈钢筛管通过U型卡与所述筛管支架连接。Preferably, the water distribution assembly consists of a plurality of stainless steel screen tubes, screen tube supports and a manifold, the manifold is connected to the water inlet, the stainless steel screen tubes are arranged on both sides of the manifold and are both connected to the manifold; two screen tube supports are provided and are arranged on both sides of the manifold, and the stainless steel screen tubes are connected to the screen tube supports via a U-shaped clip.
作为优选，所述下封头内部设置有支撑所述孔板的若干条孔板支撑管，所述孔板支撑管由套管和上支撑管组成，所述上支撑管的顶端与所述过滤孔板连接，底端插入所述套管内部，所述套管的底端与所述下封头的内壁焊接配合，所述套管与所述上支撑管焊接配合。Preferably, a plurality of orifice plate support tubes supporting the orifice plate are arranged inside the lower head, and the orifice plate support tubes are composed of a sleeve and an upper support tube. The top end of the upper support tube is connected to the filter orifice plate, and the bottom end is inserted into the sleeve. The bottom end of the sleeve is welded to the inner wall of the lower head, and the sleeve is welded to the upper support tube.
作为优选，所述壳体的一侧设置有视镜。Preferably, a viewing mirror is provided on one side of the shell.
作为优选，所述上封头上设置有上人孔，所述壳体一侧设置有侧人孔，所述下封头表面设置有下人孔。Preferably, an upper manhole is provided on the upper head, a side manhole is provided on one side of the shell, and a lower manhole is provided on the surface of the lower head.
综上，本实用新型的有益效果在于：1、通过在上封头的内侧设置由多根不锈钢筛管组成的进水系统，可将经进水口和汇管进入设备内部的含有污水均匀分散在设备内部，能够使污水中的油污分散更加均匀，配合搅拌装置搅拌后与处理药剂的混合更加均匀，且能够提高污水的处理效率；In summary, the beneficial effects of the utility model are: 1. By arranging a water inlet system composed of a plurality of stainless steel screen tubes on the inner side of the upper head, the sewage entering the equipment through the water inlet and the manifold can be evenly dispersed inside the equipment, and the oil in the sewage can be dispersed more evenly, and the mixing with the treatment agent after stirring with the stirring device is more uniform, and the sewage treatment efficiency can be improved;
2、通过设置上人孔、侧人孔和下人孔，能够方便进入设备内部进行检修，配合进水口、出水口转换进、出水，能够对设备进行反洗，清洗维护操作便捷。2. By setting up the upper manhole, side manhole and lower manhole, it is convenient to enter the equipment for maintenance. By coordinating the water inlet and outlet to switch the water inlet and outlet, the equipment can be backwashed, and the cleaning and maintenance operations are convenient.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本实用新型实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
图1是本实用新型的内部结构示意图；FIG1 is a schematic diagram of the internal structure of the utility model;
图2是本实用新型的下封头的仰视结构示意图；FIG2 is a schematic diagram of the bottom structure of the lower head of the utility model;
图3是本实用新型上封头的内部结构示意图；Figure 3 is a schematic diagram of the internal structure of the upper head of the utility model;
图4是本实用新型支撑架的结构示意图；Figure 4 is a schematic diagram of the structure of the support frame of the utility model;
图5是本实用新型进水组件的结构示意图；FIG5 is a schematic diagram of the structure of the water inlet assembly of the utility model;
图6是本实用新型孔板支撑管的结构示意图。FIG. 6 is a schematic diagram of the structure of the orifice plate support tube of the utility model.
附图标记说明如下：The following are the descriptions of the reference numerals:
1、搅拌装置；2、进水口；3、上封头；4、壳体；5、视镜；6、滤料；7、过滤孔板；8、下封头；9、初滤出口；10、支腿；11、出水口；12、下人孔；13、孔板支撑管；13a、上支撑管；13b、套管；14、水帽；15、侧人孔；16、搅拌轴；17、上人孔；18、加药口；19、凸缘法兰；20、中心管；21、支撑架；22、汇管；23、不锈钢筛管；24、筛管支架；25、排污口；26、出油口。1. Stirring device; 2. Water inlet; 3. Upper head; 4. Shell; 5. Sight glass; 6. Filter material; 7. Filter orifice plate; 8. Lower head; 9. Primary filter outlet; 10. Support legs; 11. Water outlet; 12. Lower manhole; 13. Orifice plate support pipe; 13a. Upper support pipe; 13b. Casing; 14. Water cap; 15. Side manhole; 16. Stirring shaft; 17. Upper manhole; 18. Dosing port; 19. Flange; 20. Center pipe; 21. Support frame; 22. Manifold; 23. Stainless steel screen tube; 24. Screen tube bracket; 25. Sewage outlet; 26. Oil outlet.
具体实施方式DETAILED DESCRIPTION
为使本实用新型的目的、技术方案和优点更加清楚，下面将对本实用新型的技术方案进行详细的描述。显然，所描述的实施例仅仅是本实用新型一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动的前提下所得到的所有其它实施方式，都属于本实用新型所保护的范围。In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.
参见图1-图6所示，本实用新型提供了一种油水过滤器，包括壳体4、上封头3和下封头8，所述上封头3和下封头8分别设置在所述壳体4的顶部和底部，且与所述壳体4焊接配合；As shown in FIGS. 1 to 6 , the utility model provides an oil-water filter, comprising a housing 4, an upper head 3 and a lower head 8, wherein the upper head 3 and the lower head 8 are respectively arranged at the top and the bottom of the housing 4 and are welded to the housing 4;
所述上封头3的顶部中间设置有搅拌装置1，该搅拌装置1贯穿所述上封头3后插入所述壳体4内部，所述上封头3上设置有进水口2，所述上封头3内部设置有散布污水的布水组件，该进水组件与所述进水口2连通，所述上封头3上设置有加药口18和出油口26；所述搅拌装置1的下部设置有搅拌轴16，该搅拌轴16下端插入所述壳体4内部，且所述搅拌轴16的端部设置有搅拌桨，搅拌装置1为电机、支架和联轴器，电机带动搅拌轴16和搅拌桨，可搅动壳体4内部的污水和处理药剂，所述上封头3内部对应所述搅拌轴16设置有轴支撑结构；所述轴支撑结构由中心管20和支撑架21组成，所述中心管20的上端与所述上封头3内侧的顶部连接，所述支撑架21设置在所述中心管20的下部，且所述支撑架21的端部与所述上封头3的内壁连接；所述上封头3的顶部设置有配合所述搅拌装置1固定的凸缘法兰19；如此设置，中心管20可对搅拌轴16提供导向和定位，以保证搅拌轴16在转动过程中位置的稳定性；支撑架21采用三点支撑，以进一步提高中心管20位置和结构的稳定性；A stirring device 1 is arranged in the middle of the top of the upper head 3, and the stirring device 1 penetrates through the upper head 3 and is inserted into the shell 4. A water inlet 2 is arranged on the upper head 3, and a water distribution component for spreading sewage is arranged inside the upper head 3, and the water inlet component is communicated with the water inlet 2. A dosing port 18 and an oil outlet 26 are arranged on the upper head 3; a stirring shaft 16 is arranged at the lower part of the stirring device 1, and the lower end of the stirring shaft 16 is inserted into the shell 4, and a stirring paddle is arranged at the end of the stirring shaft 16. The stirring device 1 comprises a motor, a bracket and a coupling. The motor drives the stirring shaft 16 and the stirring paddle to stir the sewage and treatment agent inside the shell 4. An axis support structure is provided inside the head 3 corresponding to the stirring shaft 16; the axis support structure is composed of a central tube 20 and a support frame 21, the upper end of the central tube 20 is connected to the top of the inner side of the upper head 3, the support frame 21 is provided at the lower part of the central tube 20, and the end of the support frame 21 is connected to the inner wall of the upper head 3; a flange 19 is provided on the top of the upper head 3 to match the stirring device 1 for fixing; in this way, the central tube 20 can provide guidance and positioning for the stirring shaft 16 to ensure the stability of the position of the stirring shaft 16 during the rotation process; the support frame 21 adopts three-point support to further improve the stability of the position and structure of the central tube 20;
所述布水组件由若干条不锈钢筛管23、筛管支架24和汇管22组成，所述汇管22与所述进水口2连通，所述不锈钢筛管23布设在所述汇管22的两侧，且均与所述汇管22连通；所述筛管支架24设置有两条，且分列在所述汇管22的两侧，所述不锈钢筛管23通过U型卡与所述筛管支架24连接；不锈钢筛管23的底部设置有出水缝，在通入污水后，可通过不锈钢筛管23底部的缝隙将污水均匀分在下方的壳体4内部；由于含有污水在单口排放时，油污会附着在壳体4内壁或在壳体4的内部形成聚集，不方便添加药物后的快速反应，而设置不锈钢筛管23后，可大大提高含油污水分散的均匀性，在向壳体4内部加入表面活性剂、破乳剂后，配合搅拌装置1的搅拌，可使处理药剂快速、均匀的分散在污水中，便于污水的快速反应；The water distribution assembly is composed of a plurality of stainless steel screen tubes 23, a screen tube support 24 and a manifold 22. The manifold 22 is connected to the water inlet 2. The stainless steel screen tubes 23 are arranged on both sides of the manifold 22 and are both connected to the manifold 22. The screen tube support 24 is provided with two and is arranged on both sides of the manifold 22. The stainless steel screen tube 23 is connected to the screen tube support 24 through a U-shaped card. A water outlet seam is provided at the bottom of the stainless steel screen tube 23. After the sewage is introduced, the sewage can be evenly distributed inside the shell 4 below through the gap at the bottom of the stainless steel screen tube 23. When the sewage is discharged from a single port, the oil will adhere to the inner wall of the shell 4 or form aggregation inside the shell 4, which is not convenient for the rapid reaction after adding the medicine. After the stainless steel screen tube 23 is provided, the uniformity of the dispersion of the oily sewage can be greatly improved. After the surfactant and demulsifier are added to the inside of the shell 4, the stirring device 1 is used to stir, so that the treatment agent can be quickly and evenly dispersed in the sewage, which is convenient for the rapid reaction of the sewage.
所述壳体4内部设置有过滤孔板7，该过滤孔板7的上方设置有滤料6；所述下封头8内部设置有支撑所述孔板的若干条孔板支撑管13，所述孔板支撑管13由套管13b和上支撑管13a组成，所述上支撑管13a的顶端与所述过滤孔板7连接，底端插入所述套管13b内部，所述套管13b的底端与所述下封头8的内壁焊接配合，所述套管13b与所述上支撑管13a焊接配合，如此设置，可在安装过滤孔板7时，先调节上支撑管13a与套管13b的相对位置，在定位后采用塞焊工艺固定上支撑管13a与套管13b，以保证过滤孔板7位置的稳定性；滤料6采用核桃壳或石英砂、活性炭，但是应保证滤料6的粒径大于过滤孔板7的孔径，避免滤料6流失，在过滤孔板7上均匀设置有水帽14，以便于处理后的污水快速排放，减少滤料6对过滤孔板7上滤孔的遮挡；A filter plate 7 is provided inside the shell 4, and a filter material 6 is provided above the filter plate 7; a plurality of plate support tubes 13 for supporting the plate are provided inside the lower head 8, and the plate support tube 13 is composed of a sleeve 13b and an upper support tube 13a, the top end of the upper support tube 13a is connected to the filter plate 7, and the bottom end is inserted into the sleeve 13b, the bottom end of the sleeve 13b is welded to the inner wall of the lower head 8, and the sleeve 13b is welded to the upper support tube 13a, so that The setting can be that when installing the filter plate 7, the relative position of the upper support tube 13a and the sleeve 13b is adjusted first, and the upper support tube 13a and the sleeve 13b are fixed by the plug welding process after positioning to ensure the stability of the position of the filter plate 7; the filter material 6 is made of walnut shells, quartz sand, or activated carbon, but the particle size of the filter material 6 should be larger than the aperture of the filter plate 7 to avoid the loss of the filter material 6, and water caps 14 are evenly arranged on the filter plate 7 to facilitate the rapid discharge of the treated sewage and reduce the blocking of the filter holes on the filter plate 7 by the filter material 6;
所述下封头8的底部设置有若干条支腿10，所述下封头8的下部设置有初滤出口9、出水口11和排污口25。A plurality of legs 10 are provided at the bottom of the lower head 8 , and a primary filter outlet 9 , a water outlet 11 and a sewage outlet 25 are provided at the lower portion of the lower head 8 .
所述壳体4的一侧设置有视镜5，视镜5可用于观察壳体4内部污水的处理状态；A viewing mirror 5 is provided on one side of the housing 4, and the viewing mirror 5 can be used to observe the treatment status of the sewage inside the housing 4;
所述上封头3上设置有上人孔17，所述壳体4一侧设置有侧人孔15，所述下封头8表面设置有下人孔12，以便于对设备进行检修；An upper manhole 17 is provided on the upper head 3, a side manhole 15 is provided on one side of the shell 4, and a lower manhole 12 is provided on the surface of the lower head 8, so as to facilitate maintenance of the equipment;
采用上述结构，通过在上封头3的内侧设置由多根不锈钢筛管23组成的进水系统，可将经进水口2和汇管22进入设备内部的含有污水均匀分散在设备内部，能够使污水中的油污分散更加均匀，配合搅拌装置1搅拌后与处理药剂的混合更加均匀，且能够提高污水的处理效率；通过设置上人孔17、侧人孔15和下人孔12，能够方便进入设备内部进行检修，配合进水口2、出水口11转换进、出水，能够对设备进行反洗，清洗维护操作便捷。By adopting the above structure, a water inlet system composed of multiple stainless steel screen tubes 23 is arranged on the inner side of the upper head 3, so that the sewage entering the equipment through the water inlet 2 and the manifold 22 can be evenly dispersed inside the equipment, which can make the oil in the sewage dispersed more evenly, and the mixing with the treatment agent after stirring with the stirring device 1 is more uniform, and the sewage treatment efficiency can be improved; by arranging the upper manhole 17, the side manhole 15 and the lower manhole 12, it is convenient to enter the interior of the equipment for maintenance, and the water inlet 2 and the water outlet 11 are used to switch the water inlet and outlet, so that the equipment can be backwashed, and the cleaning and maintenance operations are convenient.
以上所述，仅为本实用新型的具体实施方式，但本实用新型的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本实用新型的保护范围之内。因此，本实用新型的保护范围应以所述权利要求的保护范围为准。The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
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