CN111779662B - Water quantity control device for water supply pump - Google Patents
Water quantity control device for water supply pump Download PDFInfo
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- CN111779662B CN111779662B CN202010673052.0A CN202010673052A CN111779662B CN 111779662 B CN111779662 B CN 111779662B CN 202010673052 A CN202010673052 A CN 202010673052A CN 111779662 B CN111779662 B CN 111779662B
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- piston cylinder
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- channel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The invention belongs to the technical field of water supply equipment, and particularly relates to a water quantity control device for a water supply pump, which comprises a water inlet interface, go out water interface and device body, the inside passageway that is equipped with of device body, the device body is including current-limiting part and pressure reduction portion, the current-limiting part sets up in interface one end of intaking, current-limiting part is including sharp actuating mechanism, sharp actuating mechanism is equipped with the piston cylinder, piston cylinder one end is equipped with the piston dish, the piston dish is equipped with the sealing ring, the device body is equipped with the air vent, the bonding of passageway inner wall has annular elastic air bag, the pressure reduction portion sets up in interface one end of leaving water, the pressure reduction portion is including tube-shape sheet metal and toroidal cavity, tube-shape sheet metal outer wall is equipped with spacing slide, toroidal cavity is equipped with spacing spout, be equipped with reset spring between spacing slide and the spacing spout, the inside sieve that is equipped with of tube-shape sheet metal, the inside return water pipeline that is equipped with of toroidal cavity, tube-shape sheet metal axial both sides are equipped with the hole that leaks respectively.
Description
Technical Field
The invention belongs to the technical field of water supply equipment, and particularly relates to a water quantity control device for a water supply pump.
Background
The water supply pump is a water conveying device, which transmits the mechanical energy of a prime motor or other external energy to liquid to pump the liquid under pressure, and has the characteristics of high efficiency, energy conservation, compact structure, convenient integral disassembly and sealing, convenient maintenance, pipeline type installation and small installation space.
Because the water pressure pumped by the water supply pump is high and the flow rate is high, when the water supply pump is directly externally connected with water using equipment, the water using equipment is damaged due to the flow rate and the water pressure, so that in the actual use process, other equipment is generally required to be used for limiting and reducing the flow of the water pumped by the water supply pump, however, the existing limiting and pressure reducing equipment is generally a system, comprises a large number of control elements and is high in cost.
Disclosure of Invention
The purpose of the invention is: it is intended to provide a water amount control device for a water supply pump to solve the problems in the background art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a water quantity control device for a water supply pump comprises a water inlet interface, a water outlet interface and a device body, wherein a channel is arranged in the device body, the water inlet interface, the channel and the water outlet interface are communicated, the device body comprises a flow limiting part and a pressure reducing part, wherein,
the flow limiting part is arranged at one end of the water inlet connector, the flow limiting part comprises a linear driving mechanism arranged on the upper side of the device body, a piston cylinder is arranged on one side of the linear driving mechanism, a piston disc is arranged on the piston cylinder, a sealing ring matched with the piston cylinder is arranged on the piston disc, the linear driving mechanism is in transmission connection with the piston disc, an air vent is arranged on one side, away from the piston disc, of the device body, the upper end of the air vent penetrates through the device body and is communicated with the piston cylinder, an annular elastic air bag is bonded on the inner wall of the channel, and the lower end of the air vent is communicated with the annular elastic air bag;
the pressure reducing part is arranged at one end of the water outlet interface and comprises a cylindrical thin plate connected with the inner wall of the channel in a sliding way and an annular cavity arranged along the axial direction of the channel, a limiting sliding plate is arranged on one side of the outer wall of the cylindrical thin plate, which is close to the water inlet interface, a limiting sliding groove matched with the limiting sliding plate is arranged on one side of the annular cavity, which is close to the water inlet interface, a return spring is arranged between the limiting sliding plate and the limiting sliding chute, a sieve plate is arranged at one side of the interior of the cylindrical thin plate, which is close to the water inlet interface, a plurality of water return pipelines which are uniformly distributed are arranged in the annular cavity, the water return pipelines are axially arranged along the channel and are communicated with the channel, the axial two sides of the cylindrical thin plate are respectively provided with a plurality of water leakage holes matched with the two ends of the water return pipeline, and the distance between the water leakage holes on the same side and the water return pipeline interface on the same side is equal to the maximum sliding distance of the limiting sliding plate in the limiting sliding groove.
By adopting the technical scheme of the invention, the water inlet interface is used for being externally connected with a water supply pump, the water outlet interface is used for being externally connected with water using equipment, and water pumped by the water supply pump flows into the water using equipment through the water inlet interface, the channel of the device body and the water outlet interface in sequence;
the linear driving mechanism of the flow limiting part is started, so that the linear driving mechanism drives the piston disc to move in the piston cylinder, and the piston disc and the piston cylinder are sealed through the sealing ring, so that the piston disc can compress gas in the piston cylinder during movement, the gas in the piston cylinder is sent into the annular elastic air bag through the vent hole, and the annular elastic air bag is expanded, so that the water outlet aperture of the channel is reduced, and the water supply amount is reduced;
after the water outlet aperture of the channel is reduced to adjust the water supply amount, the water pressure is increased, at the moment, water enters the decompression part and can buffer the water pressure through scouring the sieve plate, and on the other hand, when the sieve plate is scoured, the tubular thin plate is in sliding connection with the channel, so that the sieve plate can drive the tubular thin plate to move, the limiting sliding plate overcomes the elasticity of the return spring to slide in the limiting sliding groove, and at the moment, the return spring is in a compressed state;
along with the movement of the cylindrical thin plate, the water leakage holes on the same side of the cylindrical thin plate can be slowly close to the interfaces of the water return pipeline on the same side, so that water can be communicated with the interfaces on the two sides of the water return pipeline in the annular cavity through the water leakage holes on the two axial sides, and the water in the channel can flow into the water return pipeline to release pressure, so that the water pressure is reduced;
in addition, according to different water pressures, the larger the water pressure is, the larger the displacement of the cylindrical thin plate is, the larger the flow area of the same-side water leakage hole and the same-side water return pipeline interface is, so that the larger the water quantity entering the water return pipeline is, the larger the pressure relief degree is, and the pressure relief can be carried out in a self-adaptive manner on different water pressures;
after the use is finished, the linear driving mechanism is controlled to be started, the piston disc is restored to the initial position, the annular elastic air bag is elastically retracted, air enters the piston cylinder again through the vent hole, and meanwhile, the return spring is elastically restored to restore the cylindrical thin plate;
the invention has simple structure, convenient production and processing, simple operation and use and lower cost, and can adaptively regulate and release pressure according to the water pressure and protect water-using equipment.
Further, the linear driving mechanism is any one of a slide bar electric cylinder, a slide bar hydraulic cylinder and a slide bar air cylinder. The structure simplifies the structure of the linear driving mechanism and can be conveniently controlled manually.
Further inject, the inside buffer gear that still is equipped with of piston cylinder, buffer gear is including setting up the fixed plate in the piston cylinder inside, fixed plate and piston cylinder inner wall welded fastening, the fixed plate is located the inside one side of keeping away from the piston dish of piston cylinder, the fixed plate shape and piston cylinder inner wall shape phase-match, the fixed plate is equipped with a plurality of through-holes, be equipped with buffer spring between fixed plate and the piston dish. The structure is that the linear driving mechanism can buffer through the buffer spring when driving the piston disc to move, and meanwhile, the fixed plate can limit the movement of the piston disc.
Further limiting, the middle part of the water return pipeline is provided with a plurality of coiled pipeline sections. With such a configuration, the water in the return pipe can be further buffered and depressurized by providing the serpentine pipe section.
Further limit, the number of the water return pipelines is not less than four. The structure can lead the water return pipeline to uniformly release pressure of water, and simultaneously has good water return pressure release effect.
Compared with the prior art, the invention has the following advantages:
1. the structure is simple, the production and the processing are convenient, the operation and the use are simple, the cost is lower, and compared with a current-limiting pressure-reducing system with a large number of control elements, the cost is low;
2. the piston disc is driven to move in the piston cylinder through the linear driving mechanism, gas in the piston cylinder is compressed, the annular elastic air bag is further expanded, the water outlet aperture of the channel is reduced, and the water supply amount is reduced;
3. the sieve plate can primarily buffer water in the channel, so that the water pressure is reduced, meanwhile, the water in the channel can flow into the water return pipeline for returning and pressure relief through the movement of the cylindrical thin plate, and the coiled pipeline section of the water return pipeline can further relieve the pressure of the water in the water return pipeline, so that the pressure relief effect is better;
4. the flow area of the water leakage hole and the water return pipeline interface can be changed in a self-adaptive mode according to different water pressure sizes, and therefore when the water pressure is large, the degree of water return pressure relief is large.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic view showing the construction of an embodiment of a water amount controlling apparatus for a water supply pump according to the present invention;
FIG. 2 is a schematic front view of an embodiment of a water amount control device for a water supply pump according to the present invention in a partial sectional view;
FIG. 3 is a schematic top view showing the internal cross-sectional structure of an embodiment of a water amount controlling means for a water supply pump according to the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 3;
the main element symbols are as follows:
the water inlet connector 11, the water outlet connector 12, the device body 2, the channel 21, the vent hole 22, the annular elastic air bag 23, the annular cavity 24, the limit sliding groove 241, the water return pipeline 25, the coiled pipeline section 251, the linear driving mechanism 31, the piston cylinder 32, the piston disc 321, the fixing plate 322, the through hole 323, the buffer spring 324, the cylindrical thin plate 41, the limit sliding plate 411, the return spring 412, the sieve plate 413 and the water leakage hole 414
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in fig. 1-4, the water quantity control device for a water supply pump of the present invention comprises a water inlet 11, a water outlet 12 and a device body 2, wherein a channel 21 is arranged inside the device body 2, the water inlet 11, the channel 21 and the water outlet 12 are communicated, the device body 2 comprises a flow limiting part and a pressure reducing part, the flow limiting part is arranged at one end of the water inlet 11, the flow limiting part comprises a linear driving mechanism 31 arranged at the upper side of the device body 2, a piston cylinder 32 is arranged at one side of the linear driving mechanism 31, a piston disc 321 is arranged on the piston cylinder 32, a sealing ring matched with the piston cylinder 32 is arranged on the piston disc 321, the linear driving mechanism 31 is in transmission connection with the piston disc 321, a vent hole 22 is arranged at one side of the device body 2 far from the piston disc, the upper end of the vent hole 22 penetrates through the device body 2 to be communicated with the piston cylinder 32, an annular elastic air bag 23 is bonded on the inner wall of the channel 21, the lower end of the vent hole 22 is communicated with the annular elastic air bag 23, the pressure reducing part is arranged at one end of the water outlet port 12 and comprises a cylindrical thin plate 41 connected with the inner wall of the channel 21 in a sliding manner and an annular cavity 24 arranged along the axial direction of the channel 21, a limiting sliding plate 411 is further arranged on one side, close to the water inlet port 11, of the outer wall of the cylindrical thin plate 41, a limiting sliding groove 241 matched with the limiting sliding plate 411 is arranged on one side, close to the water inlet port 11, of the annular cavity 24, a limiting sliding groove 241 matched with the limiting sliding plate 411 is arranged on one side, close to the water inlet port 11, of the annular cavity 241, a reset spring 412 is arranged between the limiting sliding plate 411 and the limiting sliding groove 241, a sieve plate 413 is arranged on one side, close to the water inlet port 11, of the cylindrical thin plate 41, a plurality of uniformly distributed water return pipelines 25 are arranged along the axial direction of the channel 21 and communicated with the channel 21, a plurality of water leakage holes 414 matched with the two ends of the water return pipeline 25 are respectively arranged on the two axial sides of the cylindrical thin plate 41, and the same side of the same as the water leakage holes 414, and the same as the maximum sliding distance of the limiting sliding plate 411 in the limiting sliding groove 241 And (5) separating.
By adopting the technical scheme of the invention, the water inlet interface 11 is used for being externally connected with a water supply pump, the water outlet interface 12 is used for being externally connected with water using equipment, and water pumped by the water supply pump flows into the water using equipment through the water inlet interface 11, the channel 21 of the device body 2 and the water outlet interface 12 in sequence;
the linear driving mechanism 31 of the flow limiting part is opened, the linear driving mechanism 31 drives the piston disc 321 to move in the piston cylinder 32, and the piston disc 321 and the piston cylinder 32 are sealed through a sealing ring, so that the piston disc 321 compresses gas in the piston cylinder 32 when moving, the gas in the piston cylinder 32 is sent into the annular elastic air bag 23 through the vent hole 22, the annular elastic air bag 23 is expanded, the water outlet aperture of the channel 21 is reduced, and the water supply amount is reduced;
after the water outlet aperture of the channel 21 is reduced to adjust the water supply amount, the water pressure is increased, at the moment, water enters the decompression part and can buffer the water pressure through the scouring sieve plate 413, and on the other hand, when the sieve plate 413 is scoured, the tubular thin plate 41 is driven by the sieve plate 413 to move due to the sliding connection between the tubular thin plate 41 and the channel 21, so that the limiting sliding plate 411 overcomes the elastic force of the return spring 412 to slide in the limiting sliding groove 241, and at the moment, the return spring 412 is in a compressed state;
along with the movement of the cylindrical thin plate 41, the water leakage holes 414 on the same side of the cylindrical thin plate 41 slowly approach to the interfaces of the water return pipelines 25 on the same side, so that water can be communicated with the interfaces on the two sides of the water return pipeline 25 in the annular cavity 24 through the water leakage holes 414 on the two axial sides, and the water in the channel 21 can flow into the water return pipeline 25 to release pressure, thereby reducing the water pressure;
moreover, according to different water pressures, the larger the water pressure is, the larger the displacement of the cylindrical thin plate 41 is, the larger the flow area of the interface between the water leakage hole 414 on the same side and the water return pipeline 25 on the same side is, so that the larger the water quantity entering the water return pipeline 25 is, the larger the pressure relief degree is, and the pressure relief can be carried out in a self-adaptive manner according to different water pressures;
after the use is finished, the linear driving mechanism 31 is controlled to be started, the piston disc 321 is restored to the initial position, the annular elastic air bag 23 is elastically retracted, the air enters the piston cylinder 32 again through the vent hole 22, and meanwhile, the return spring 412 is elastically restored to restore the cylindrical thin plate 41;
the invention has simple structure, convenient production and processing, simple operation and use and lower cost, and can adaptively regulate and release pressure according to the water pressure and protect water-using equipment.
Specifically, the linear driving mechanism 31 is any one of a slide bar electric cylinder, a slide bar hydraulic cylinder, and a slide bar air cylinder. With such a configuration, the linear driving mechanism 31 can be driven with a simple configuration and can be easily controlled manually. In fact, other configurations may be used depending on the situation, and the structure for driving the linear driving mechanism 31 may be simplified and may be controlled manually.
Specifically, the inside buffer gear that still is equipped with of piston cylinder 32, buffer gear is including setting up in the inside fixed plate 322 of piston cylinder 32, fixed plate 322 and piston cylinder 32 inner wall welded fastening, and fixed plate 322 is located the inside one side of keeping away from piston disc 321 of piston cylinder 32, and fixed plate 322 shape and piston cylinder 32 inner wall shape phase-match, and fixed plate 322 is equipped with a plurality of through-holes 323, is equipped with buffer spring 324 between fixed plate 322 and the piston disc 321. With this configuration, when the linear drive mechanism 31 drives the piston disc 321 to move, the damping spring 324 can damp the movement, and the fixing plate 322 can limit the movement of the piston disc 321. In fact, other configurations may be used as appropriate, and the linear drive mechanism 31 can provide damping when it moves the plunger disc 321.
Specifically, the middle of the return pipeline 25 is provided with a plurality of serpentine pipeline sections 251. With this configuration, the water in the return pipe 25 can be further reduced in pressure by the provision of the serpentine pipe section 251. In fact, other configurations are also contemplated as appropriate, and the water in the return line 25 can be further buffered and depressurized.
Specifically, the number of the water return pipes 25 is not less than four. With the structure, the water return pipeline 25 can uniformly release pressure of water, and the effect of water return pressure release is good. In fact, other structures can be considered according to the situation, so that the water return pipeline 25 can uniformly release pressure of water, and the effect of water return pressure release is good.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. The utility model provides a water yield controlling means for working shaft, includes into water interface (11), play water interface (12) and device body (2), its characterized in that: the device body (2) is internally provided with a channel (21), the water inlet interface (11), the channel (21) and the water outlet interface (12) are communicated, the device body (2) comprises a flow limiting part and a pressure reducing part, wherein,
the flow limiting part is arranged at one end of the water inlet connector (11), the flow limiting part comprises a linear driving mechanism (31) arranged on the upper side of the device body (2), a piston cylinder (32) is arranged on one side of the linear driving mechanism (31), a piston disc (321) is arranged on the piston cylinder (32), a sealing ring matched with the piston cylinder (32) is arranged on the piston disc (321), the linear driving mechanism (31) is in transmission connection with the piston disc (321), an air vent (22) is arranged on one side, away from the piston disc, of the device body (2), the upper end of the air vent (22) penetrates through the device body (2) and is communicated with the piston cylinder (32), an annular elastic air bag (23) is bonded on the inner wall of the channel (21), and the lower end of the air vent (22) is communicated with the annular elastic air bag (23);
the pressure reducing part is arranged at one end of the water outlet interface (12), the pressure reducing part comprises a cylindrical thin plate (41) connected with the inner wall of the channel (21) in a sliding manner and an annular cavity (24) axially arranged along the channel (21), a limiting sliding plate (411) is further arranged on one side, close to the water inlet interface (11), of the outer wall of the cylindrical thin plate (41), the annular cavity (24) is provided with a limiting sliding groove (241) matched with the limiting sliding plate (411) on one side close to the water inlet interface (11), a reset spring (412) is arranged between the limiting sliding plate (411) and the limiting sliding groove (241), a sieve plate (413) is arranged on one side, close to the water inlet interface (11), of the cylindrical thin plate (41), a plurality of uniformly distributed water return pipelines (25) are arranged inside the annular cavity (24), and the water return pipelines (25) are axially arranged along the channel (21) and are communicated with the channel (21), the axial two sides of the cylindrical thin plate (41) are respectively provided with a plurality of water leakage holes (414) matched with the two ends of the water return pipeline (25), the water leakage holes (414) on the same side and the distance between the interfaces of the water return pipeline (25) on the same side are equal to the maximum sliding distance of the limiting sliding plate (411) in the limiting sliding groove (241).
2. The water amount control device for a water supply pump according to claim 1, characterized in that: the linear driving mechanism (31) is any one of a slide bar electric cylinder, a slide bar hydraulic cylinder and a slide bar air cylinder.
3. The water amount control device for a water supply pump according to claim 1, characterized in that: the inside buffer gear that still is equipped with of piston cylinder (32), buffer gear is including setting up in fixed plate (322) inside of piston cylinder (32), fixed plate (322) and piston cylinder (32) inner wall welded fastening, fixed plate (322) are located the inside one side of keeping away from piston dish (321) of piston cylinder (32), fixed plate (322) shape and piston cylinder (32) inner wall shape phase-match, fixed plate (322) are equipped with a plurality of through-holes (323), be equipped with buffer spring (324) between fixed plate (322) and piston dish (321).
4. The water amount control device for a water supply pump according to claim 1, characterized in that: the middle part of the water return pipeline (25) is provided with a plurality of coiled pipeline sections (251).
5. The water amount control device for a water supply pump according to claim 1, characterized in that: the number of the water return pipelines (25) is not less than four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673052.0A CN111779662B (en) | 2020-07-14 | 2020-07-14 | Water quantity control device for water supply pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010673052.0A CN111779662B (en) | 2020-07-14 | 2020-07-14 | Water quantity control device for water supply pump |
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| Publication Number | Publication Date |
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| CN111779662A CN111779662A (en) | 2020-10-16 |
| CN111779662B true CN111779662B (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010673052.0A Active CN111779662B (en) | 2020-07-14 | 2020-07-14 | Water quantity control device for water supply pump |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575593A (en) * | 1980-06-10 | 1982-01-12 | Fuji Electric Co Ltd | Pump starter for pump system |
| CN1900572A (en) * | 2006-07-21 | 2007-01-24 | 王海平 | Automatic pressure reducing flow stable valve |
| CN110939762A (en) * | 2019-11-26 | 2020-03-31 | 西安航天动力研究所 | Pressure reducing regulating valve with safe pressure relief function |
| CN210318797U (en) * | 2019-08-12 | 2020-04-14 | 温州路法莱洁具有限公司 | Pressure reducing faucet |
| CN111039358A (en) * | 2020-02-21 | 2020-04-21 | 北京朗新明环保科技有限公司 | Energy conversion system for zero discharge of desulfurization wastewater |
| CN111043369A (en) * | 2019-11-26 | 2020-04-21 | 西安航天动力研究所 | Pressure reducing regulating valve with inlet variable flow limiting buffer |
-
2020
- 2020-07-14 CN CN202010673052.0A patent/CN111779662B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS575593A (en) * | 1980-06-10 | 1982-01-12 | Fuji Electric Co Ltd | Pump starter for pump system |
| CN1900572A (en) * | 2006-07-21 | 2007-01-24 | 王海平 | Automatic pressure reducing flow stable valve |
| CN210318797U (en) * | 2019-08-12 | 2020-04-14 | 温州路法莱洁具有限公司 | Pressure reducing faucet |
| CN110939762A (en) * | 2019-11-26 | 2020-03-31 | 西安航天动力研究所 | Pressure reducing regulating valve with safe pressure relief function |
| CN111043369A (en) * | 2019-11-26 | 2020-04-21 | 西安航天动力研究所 | Pressure reducing regulating valve with inlet variable flow limiting buffer |
| CN111039358A (en) * | 2020-02-21 | 2020-04-21 | 北京朗新明环保科技有限公司 | Energy conversion system for zero discharge of desulfurization wastewater |
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| CN111779662A (en) | 2020-10-16 |
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Effective date of registration: 20220208 Address after: 518000 Room 101, No. 82, laowei, Laocun, Xintian community, Guanhu street, Longhua District, Shenzhen City, Guangdong Province Applicant after: Shenzhen Xiaoli Engineering Equipment Co.,Ltd. Address before: 517399 No. 94, Shangba, Jiangbian village committee, Laolong Town, Longchuan County, Heyuan City, Guangdong Province Applicant before: Wang Weiquan |
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