CN110242580B - Low-temperature-rise energy-saving full-lift submersible electric pump - Google Patents
Low-temperature-rise energy-saving full-lift submersible electric pump Download PDFInfo
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- CN110242580B CN110242580B CN201910528232.7A CN201910528232A CN110242580B CN 110242580 B CN110242580 B CN 110242580B CN 201910528232 A CN201910528232 A CN 201910528232A CN 110242580 B CN110242580 B CN 110242580B
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- electric pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/007—Details, component parts, or accessories especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
- F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a low-temperature-rise energy-saving full-lift submersible electric pump which comprises a submersible electric pump main body and is characterized in that the submersible electric pump main body comprises a water outlet end and a water inlet end which are arranged at the upper end and the lower end of the submersible electric pump main body, the lower end of the water inlet end is connected with an external cylinder through a flange device, the external cylinder is sequentially provided with a circular table section and a straight cylinder section from top to bottom, a transmission shaft is concentrically and vertically arranged in the external cylinder, and the external cylinder is respectively provided with a grinding disc mechanism, a cutter disc mechanism and a filter screen mechanism from bottom to top; the grinding disc mechanism comprises a movable grinding disc fixedly connected to the outer wall of the transmission shaft and a fixed grinding disc fixedly connected to the inner wall of the straight cylinder section. The invention can crush impurities into fine particles and then convey the fine particles, thereby avoiding the situation that the motor is blocked due to larger particles, prolonging the service life, and additionally, the thermal compensation cavity is arranged to avoid the situation that the fixed grinding disc is cracked due to the phenomena of expansion with heat and contraction with cold.
Description
Technical Field
The invention relates to the technical field of full-lift submersible electric pumps, in particular to a low-temperature-rise energy-saving full-lift submersible electric pump.
Background
The submersible electric pump is an integral body formed by organically combining a pump and a motor, and is mainly divided into two types according to the conveyed media: a sewage submersible electric pump for pumping sewage and a small submersible electric pump (commonly called a clean water pump) for pumping clean water.
At present, mature products have been developed for the purpose of improving the service performance of the submersible electric pump and increasing the advantages of low temperature rise, energy conservation and full lift. The high-lift submersible electric pump is suitable for extracting underground water from deep wells and mines, and can be used for gold mine, silver mine, iron mine, coal mine emergency rescue and construction site drainage. (the flow can reach 50 tons per hour, and the lift can reach 1500 meters). However, in the long-term use process, the submersible electric pump can often suck stones with different particle sizes and other impurities, and the like, and because the water inlet of the submersible electric pump is not provided with a device for crushing the stones and other impurities, the submersible electric pump is difficult to avoid the phenomena of shell clamping and even burning of the motor after long-term use, and the service life of the submersible electric pump is shortened.
Disclosure of Invention
The invention aims to solve the problems in the background technology and provides a low-temperature-rise energy-saving full-lift submersible electric pump.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-temperature-rise energy-saving full-lift submersible electric pump comprises a submersible electric pump main body and is characterized in that the submersible electric pump main body comprises a water outlet end and a water inlet end which are arranged at the upper end and the lower end of the submersible electric pump main body, the lower end of the water inlet end is connected with an external connecting cylinder through a flange device, the external connecting cylinder is sequentially provided with a circular table section and a straight cylinder section from top to bottom, a transmission shaft is concentrically and vertically arranged in the external connecting cylinder, and the external connecting cylinder is respectively provided with a grinding disc mechanism, a cutter disc mechanism and a filter screen mechanism from bottom to top; the grinding disc mechanism comprises a movable grinding disc fixedly connected to the outer wall of a transmission shaft and a fixed grinding disc fixedly connected to the inner wall of a straight cylinder section, wherein a first-stage gentle section A, a first-stage enlarged section A, a second-stage gentle section A and a second-stage enlarged section A are sequentially arranged from bottom to top of the movable grinding disc, a first-stage gentle section B, a first-stage enlarged section B, a second-stage gentle section B and a second-stage enlarged section B are sequentially arranged from bottom to top of the fixed grinding disc, the first-stage gentle section A, the first-stage gentle section B, the second-stage gentle section A and the second-stage gentle section B all adopt circular table structures, a feeding channel is formed between the movable grinding disc and the fixed grinding disc, and the distance between the movable grinding disc and the fixed grinding disc in the feeding channel is gradually reduced; the cutter head mechanism comprises a plurality of movable cutter heads symmetrically and fixedly connected to the outer wall of the transmission shaft and a plurality of fixed cutter heads symmetrically and fixedly connected to the inner wall of the circular table section, and the movable cutter heads and the fixed cutter heads are arranged in a staggered mode; the filter screen mechanism includes the positive filter screen of fixed connection at round platform section upper end inner wall, the side export has just been seted up between per two adjacent cutterheads to the inner wall of round platform section, the inner wall fixedly connected with side filter screen of side export, and the inner wall parallel and level setting of side filter screen and round platform section.
Preferably, the flange device comprises flange plates which are respectively and fixedly connected to the lower end of the water inlet end and the upper end of the external connecting cylinder, one side, close to each other, of each of the two flange plates is glued with a flange pad, a plurality of threaded holes are formed in the two flange plates in a circumferential equiangular mode, and two threaded holes which are respectively located on the two flange plates and correspond to each other in position are in threaded connection with bolts jointly.
Preferably, a plurality of thermal compensation cavities are formed in the fixed grinding disc at positions close to the movable grinding disc.
Preferably, the mesh number of the positive filter screen is larger than that of the side filter screen.
Preferably, the upper end of the transmission shaft is fixedly connected with the output end of the submersible electric pump body.
Preferably, the thermal compensation cavity is semicircular.
Compared with the prior art, the low-temperature-rise energy-saving full-lift submersible electric pump has the advantages that:
1. the impurities are continuously sucked, ground, sucked and ground under the action of the submersible electric pump main body 1, the impurities with the general granularity are ground, then small particles are formed under the shearing of the movable cutter disc 7 and the fixed cutter disc 8, and only the impurity particles smaller than the positive filter screen 13 can pass through under the filtering of the positive filter screen 13, so that stones with different particle sizes, other impurities and the like are thoroughly prevented from being sucked, the phenomena of shell blocking and even burning of a motor of the submersible electric pump can be avoided after long-time use, and the service life of the submersible electric pump is shortened;
2. because the movable grinding disc 10, the fixed grinding disc 11 and impurities are continuously ground, heat is generated between the movable grinding disc 10 and the fixed grinding disc 11, the heat of cooling water is removed, the phenomenon of expansion caused by heat and contraction caused by cold can be responded through the thermal compensation cavity 12, and the possibility that the movable grinding disc 10 and the fixed grinding disc 11 are cracked due to expansion caused by heat and contraction caused by cold is avoided;
in conclusion, the invention can crush impurities into fine particles and then convey the fine particles, thereby avoiding the situation that the motor is blocked due to larger particles, prolonging the service life, and additionally, the thermal compensation cavity is arranged to avoid the situation that the fixed grinding disc is cracked due to the phenomena of expansion with heat and contraction with cold.
Drawings
FIG. 1 is a perspective view of a low temperature rise energy-saving full lift submersible electric pump according to the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged, schematic view of a portion of FIG. 2 in accordance with the present invention;
fig. 4 is a schematic structural diagram of a low-temperature-rise energy-saving full-lift submersible electric pump in a bottom view.
In the figure: 1. the submerged motor pump comprises a submerged motor pump main body, a water outlet end 2, a water inlet end 3, a flange device 4, a material inlet channel 5, an external connecting cylinder 6, a straight cylinder section 61, a circular table section 62, a movable cutter disc 7, a fixed cutter disc 8, a transmission shaft 9, a movable grinding disc 10, a first-level gentle section A101, a first-level enlarged section A102, a second-level gentle section A103, a second-level enlarged section A104, a fixed grinding disc 11, a first-level gentle section B111, a first-level enlarged section B112, a second-level gentle section B113, a second-level enlarged section B114, a thermal compensation cavity 12, a positive filter screen 13, a side outlet 14 and a.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "cover", "fitted", "attached", "fixed", "distributed", and the like are to be understood in a broad sense, and may be, for example, fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1-4, a low-temperature-rise energy-saving full-lift submersible electric pump comprises a submersible electric pump main body 1, wherein the submersible electric pump main body 1 comprises a water outlet end 2 and a water inlet end 3 which are arranged at the upper end and the lower end of the submersible electric pump main body, the lower end of the water inlet end 3 is connected with an external cylinder 6 through a flange device 4, the external cylinder 6 is sequentially provided with a circular table section 62 and a straight cylinder section 61 from top to bottom, a transmission shaft 9 is concentrically and vertically arranged in the external cylinder 6, and the external cylinder 6 is respectively provided with a grinding disc mechanism, a cutter disc mechanism and a filter;
the grinding disc mechanism comprises a movable grinding disc 10 fixedly connected to the outer wall of the transmission shaft 9 and a fixed grinding disc 11 fixedly connected to the inner wall of the straight cylinder section 61, the movable grinding disc 10 is sequentially provided with a first-level gentle section A101, a first-level expansion section A102, a second-level gentle section A103 and a second-level expansion section A104 from bottom to top, the fixed grinding disc 11 is sequentially provided with a first-level gentle section B111, a first-level expansion section B112, a second-level gentle section B113 and a second-level expansion section B114 from bottom to top, the first-level gentle section A101, the first-level gentle section B111, the second-level gentle section A102 and the second-level gentle section B112 are of circular structures, the first-level expansion section A102, the first-level expansion section B112, the second-level expansion section A104 and the second-level expansion section B114 are of circular table-shaped structures, a feeding channel 5 is formed between;
the cutter head mechanism comprises a plurality of movable cutter heads 7 symmetrically and fixedly connected to the outer wall of the transmission shaft 9 and a plurality of fixed cutter heads 8 symmetrically and fixedly connected to the inner wall of the circular table section 62, and the movable cutter heads 7 and the fixed cutter heads 8 are arranged in a staggered mode, so that the shearing capacity is improved to the maximum extent;
the filter screen mechanism includes positive filter screen 13 of fixed connection at 62 upper end inner walls of round platform section, and the side export 14 has just been seted up between per two adjacent cutterheads 8 to the inner wall of round platform section 62, and the inner wall fixedly connected with side filter screen 15 of side export 14, and the inner wall parallel and level setting of side filter screen 15 and round platform section 62.
Flange means 4 is including respectively fixed connection at 3 lower extremes of income water end and the ring flange of fixed connection in the upper end of external connection section of thick bamboo 6, one side that two ring flanges are close to each other all is glued has the flange pad, a plurality of screw holes have been seted up to two ring flange circumference equiangular, be located two ring flanges respectively and the common threaded connection of two screw holes of position correspondence has the bolt, specifically, can make the flange pad on the ring flange align one by one, and use bolt screw in screw hole, thereby accomplish the external fixation between section of thick bamboo 6 and submerged motor pump main part 1.
The position that is close to moving mill 10 in deciding mill 11 has seted up a plurality of thermal compensation chambeies 12, and thermal compensation chamber 12 semicircular in shape because move mill 10 and decide mill 11 and impurity and be grinding constantly, consequently move and can produce the heat between mill 10 and the fixed mill 11, except that the water-cooled heat, can also respond to the phenomenon of expend with heat and contract with cold through thermal compensation chamber 12, avoid moving mill 10 and fixed mill 11 and produce the possibility of crack because of expend with heat and contract with cold.
The mesh number of the front filter screen 13 is larger than that of the side filter screen 15, and the mesh number is expressed by the mesh number in each centimeter of length in China, namely, the larger the mesh number is, the smaller the mesh number is.
The upper end of transmission shaft 9 and submerged motor pump body 1's output fixed connection, submerged motor pump body 1 includes the motor and the pump body, and the motor setting is inside it, and submerged motor pump body 1 is the energy-conserving full lift submerged motor pump of low temperature rise, and this is the mature product among the prior art, has also proposed in the background art, consequently does not give unnecessary details here.
In the invention, before the submersible electric pump main body 1 is used, an external cylinder 6 is fixedly connected to the lower end of a water inlet end 3 in a sealing way by using a flange device 4, water mixed with stones and impurities with different particle sizes enters the external cylinder 6 through a material inlet channel 5, meanwhile, an output end in the submersible electric pump main body 1 drives a transmission shaft 9 to rotate at a high speed, the impurities such as the stones and the like between a movable grinding disc 11 rotating at the high speed and a fixed grinding disc 11 are continuously sucked into a first-stage gentle section A101 and a first-stage gentle section B111 under the action of the suction force of the submersible electric pump main body 1, and a first-stage expanded section A102 and a first-stage expanded section B112 with gradually reduced intervals are subjected to pressure grinding, a second-stage gentle section A103 and a second-stage section B113 are sucked, and a second-stage expanded section A104 and a second-stage;
the ground impurities enter the circular table section 62, the high-speed rotating movable cutter disc 7 and the fixed cutter disc 8 further shear and crush the ground impurities, the impurities smaller than the size of the filter hole of the positive filter screen 13 can enter the submersible electric pump main body 1 through the positive filter screen 13 and flow out through the water outlet end 2, the impurities larger than the size of the filter hole of the positive filter screen 13 cannot pass through the positive filter screen 13 and can be retained in the circular table section 62 to be continuously crushed until the impurities are smaller than the size of the filter hole of the positive filter screen 13, and the impurities can return to the water through the side filter screen 15 on the side outlet 14 under the action of centrifugal force.
The invention has the following advantages: continuously inhales impurity under the effect of submerged motor pump main part 1, the grinding is inhaled, the grinding is the general impurity of granularity, then form less granule under the shearing of movable cutter 7 with fixed cutter 8, and under the filtration of positive filter screen 13, only be less than the impurity particle of positive filter screen 13 and just can pass through, thoroughly avoid because of inhaling not stone and other impurity of equidimension of granule, the card shell appears in the submerged motor pump can appear in long-time use being difficult to avoid, even the phenomenon of burning out appears in the motor, the condition that shortens the life of submerged motor pump appears.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. The low-temperature-rise energy-saving full-lift submersible electric pump comprises a submersible electric pump main body (1) and is characterized in that the submersible electric pump main body (1) comprises a water outlet end (2) and a water inlet end (3) which are arranged at the upper end and the lower end of the submersible electric pump main body, the lower end of the water inlet end (3) is connected with an external connecting cylinder (6) through a flange device (4), the external connecting cylinder (6) is sequentially provided with a circular platform section (62) and a straight cylinder section (61) from top to bottom, a transmission shaft (9) is concentrically and vertically arranged in the external connecting cylinder (6), and the external connecting cylinder (6) is respectively provided with a grinding disc mechanism, a cutter disc mechanism and a filter screen mechanism from bottom to;
the grinding disc mechanism comprises a movable grinding disc (10) fixedly connected to the outer wall of a transmission shaft (9) and a fixed grinding disc (11) fixedly connected to the inner wall of a straight cylinder section (61), wherein the movable grinding disc (10) is sequentially provided with a first-level gentle section A (101), a first-level enlarged section A (102), a second-level gentle section A (103) and a second-level enlarged section A (104) from bottom to top, the fixed grinding disc (11) is sequentially provided with a first-level gentle section B (111), a first-level enlarged section B (112), a second-level gentle section B (113) and a second-level enlarged section B (114) from bottom to top, the first-level gentle section A (101), the first-level gentle section B (111), the second-level gentle section A (103) and the second-level gentle section B (113) all adopt circular structures, and the first-level enlarged section A (102), the first-level enlarged section B (112), the second-level enlarged, a feeding channel (5) is formed between the movable grinding disc (10) and the fixed grinding disc (11), and the distance between the movable grinding disc (10) and the fixed grinding disc (11) in the feeding channel (5) is gradually reduced;
the cutter head mechanism comprises a plurality of movable cutter heads (7) symmetrically and fixedly connected to the outer wall of the transmission shaft (9) and a plurality of fixed cutter heads (8) symmetrically and fixedly connected to the inner wall of the circular table section (62), and the movable cutter heads (7) and the fixed cutter heads (8) are arranged in a staggered mode;
the filter screen mechanism includes positive filter screen (13) of fixed connection at round platform section (62) upper end inner wall, the inner wall of round platform section (62) and offered side export (14) between per two adjacent cutter heads (8), the inner wall fixedly connected with side filter screen (15) of side export (14), and the inner wall parallel and level setting of side filter screen (15) and round platform section (62).
2. The low-temperature-rise energy-saving full-lift submersible electric pump as recited in claim 1, wherein the flange device (4) comprises flanges fixedly connected to the lower end of the water inlet end (3) and the upper end of the outer connecting cylinder (6), respectively, a flange pad is glued to one side of each of the two flanges close to each other, a plurality of threaded holes are formed in the two flanges at equal angles in the circumferential direction, and two threaded holes which are located on the two flanges and correspond to each other in position are jointly in threaded connection with bolts.
3. The low-temperature-rise energy-saving full-lift submersible electric pump according to claim 1, characterized in that a plurality of thermal compensation chambers (12) are arranged in the fixed grinding disc (11) at positions close to the movable grinding disc (10).
4. The low temperature rise energy-saving full-lift submersible electric pump according to claim 1, characterized in that the mesh number of the positive screen (13) is larger than that of the side screen (15).
5. The low-temperature-rise energy-saving full-lift submersible electric pump according to claim 1, characterized in that the upper end of the transmission shaft (9) is fixedly connected with the output end of the submersible electric pump body (1).
6. A low temperature rise energy saving full head submersible electric pump according to claim 3 characterized in that the thermal compensation chamber (12) is semicircular.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528232.7A CN110242580B (en) | 2019-06-18 | 2019-06-18 | Low-temperature-rise energy-saving full-lift submersible electric pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910528232.7A CN110242580B (en) | 2019-06-18 | 2019-06-18 | Low-temperature-rise energy-saving full-lift submersible electric pump |
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| CN110242580A CN110242580A (en) | 2019-09-17 |
| CN110242580B true CN110242580B (en) | 2020-12-08 |
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| CN201910528232.7A Active CN110242580B (en) | 2019-06-18 | 2019-06-18 | Low-temperature-rise energy-saving full-lift submersible electric pump |
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| CN107597329A (en) * | 2017-09-28 | 2018-01-19 | 杨鹏 | A kind of self-circulation type coffee bean crushes drying integral machine |
| CN207761957U (en) * | 2018-01-08 | 2018-08-24 | 浙江三统泵业有限公司 | A kind of sewage pump |
| CN207979549U (en) * | 2017-07-12 | 2018-10-19 | 保山市喝客咖啡有限公司 | A kind of coffee bean grinding device |
| US20190063190A1 (en) * | 2017-08-30 | 2019-02-28 | Saudi Arabian Oil Company | Well debris handling system |
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| CN2771524Y (en) * | 2005-02-06 | 2006-04-12 | 遵义海立水泵制造有限责任公司 | Low-temperature-rise energy-saving submersible electric pump |
| CN203990749U (en) * | 2014-07-25 | 2014-12-10 | 天津渤海望亚涂料有限公司 | A kind of paint particles grinder |
| CN204283916U (en) * | 2014-12-05 | 2015-04-22 | 上海丹泉泵业(集团)有限公司 | The submersible sewage pump improved |
| CN204816672U (en) * | 2015-07-30 | 2015-12-02 | 江苏春晖乳业有限公司 | Vertical colloid mill is used to dairy products |
| CN206215293U (en) * | 2016-11-18 | 2017-06-06 | 嘉兴科瑞德防腐工程有限公司 | A kind of vertical grinding machine |
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| US20190063190A1 (en) * | 2017-08-30 | 2019-02-28 | Saudi Arabian Oil Company | Well debris handling system |
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| CN207761957U (en) * | 2018-01-08 | 2018-08-24 | 浙江三统泵业有限公司 | A kind of sewage pump |
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| CN110242580A (en) | 2019-09-17 |
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Effective date of registration: 20201116 Address after: 221600 Jiangsu city of Xuzhou province Peixian Industrial Park Yangtun Applicant after: Xuzhou Jingyi Pump Co., Ltd Address before: 221600 Jiangsu city of Xuzhou province Peixian Industrial Park Yangtun Applicant before: Xuzhou Yatai Motor Co.,Ltd. |
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