CN103697201A - Overload protection device and overload protection method for valve actuator - Google Patents
Overload protection device and overload protection method for valve actuator Download PDFInfo
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- CN103697201A CN103697201A CN201310652580.8A CN201310652580A CN103697201A CN 103697201 A CN103697201 A CN 103697201A CN 201310652580 A CN201310652580 A CN 201310652580A CN 103697201 A CN103697201 A CN 103697201A
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- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/007—Overload
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Multiple-Way Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to an overload protection device and an overload protection method for a valve actuator and aims to solve the problem that a conventional like product is not good enough in structural design. The overload protection device is characterized in that after an oil-water filter and a manual bi-directional valve inside the tank body of the overload protection device are connected in sequence, the manual bi-directional valve is respectively connected with forward and reversal rotating overload protecting components through two pipelines, and a pressure control valve, a flow adjusting valve and a three way switch valve inside the each set of the overload protecting component are connected in sequence, one pipeline of the pressure control valve is connected with one pipeline of the three-way switch valve through an auxiliary gas pipe, and the pressure control valve and the flow adjusting valve are respectively provided with a control pressure gauge and a flow pressure gauge, and the oil-water filter is provided with a filtering pressure gauge and a pressure regulating valve. The two ends of the connecting seat of the pressure control valve are respectively connected with the flow adjusting valve and the manual bi-directional valve through air pipes of the pipelines, three through holes are formed in the seat body of the connecting seat, and are respectively connected with the control pressure gauge, a voltage-stabilizing valve and the flow adjusting valve. The overload protection device provided by the invention is suitable for being used as an overload protecting device for an air actuator in a pneumatic valve.
Description
Technical field
The present invention relates to the overload protection arrangement of pneumatic actuator, is a kind of valve actuator overload protection arrangement and overload protection method thereof.
Background technique
Pneumatic actuator is generally comprised of actuator and controlling mechanism, comprise man-operated mechanism, limit switch, solenoid valve, filtering pressure reducing valve, silencing apparatus etc., it is connected with pipeline by butterfly valve, pneumatic actuator completes butterfly valve automatically to the unlatching of pipeline or closing operation, and the switch of pneumatic actuator is realized by solenoid-driven limit switch.Its working principle is specially: when pressurized air, from A pipe, chew while entering pneumatic actuator, gas push gear counterclockwise rotates, and valve is opened, and the gas at Pneumatic executive valve two ends is chewed discharge with B pipe; Otherwise, when pressurized air, from B pipe, to chew while entering pneumatic actuator, gas push gear clockwise direction rotates, and valve is closed, and the gas in the middle of pneumatic actuator is chewed discharge with A pipe.This type of pneumatic actuator, when practical application, generally need to support the use with overload protection arrangement, thereby prevents the excessive damage pneumatic actuator of gas pressure intensity.Existing overload protection valve is as the application number 201310058959.6 disclosing in Chinese patent literature, Shen Qing Publication day 2013.05.22, denomination of invention " with the UP modulating valve of overload protection arrangement ", this UP modulating valve comprises actuator assembly, overload protection arrangement, valve rod assembly, main spring, valve gap, valve component and center bearing bracket, it is characterized in that: the top that actuator assembly is contained in valve rod parts is connected with the upper end of center bearing bracket by screw, center bearing bracket lower end is connected with valve gap upper end, valve gap lower end is connected with valve component, main spring is enclosed within on valve gap, valve rod parts are contained in valve gap and are connected with valve component, overload protection arrangement is contained on the valve rod parts in center bearing bracket, described overload protection arrangement comprises precompression nut, lining, butterfly spring and packing ring, it prevents because there are the component that overload is damaged valve internal in system.But the more difficult supporting pneumatic actuator of above-mentioned valve body is used, be more difficultly applicable to various pipe valves, and the pneumatic actuator that requires of different air pressure; Meanwhile, its overload atmospheric pressure value regulates comparatively inconvenience, and volume, space hold are large, more difficult repair and replacement.
Summary of the invention
For overcoming above-mentioned deficiency; the object of the invention is to provide to related domain a kind of valve actuator overload protection arrangement and overload protection method thereof; make it solve the applicable pneumatic actuator of existing like product limited, assembling, inconvenient maintenance, the technical problem of air pressure, Flow-rate adjustment complexity.Its objective is and be achieved through the following technical solutions.
A valve actuator overload protection arrangement, is provided with positive and negative two-way pipeline in the casing of this overload protection arrangement, the positive and negative rotation that one end of positive and negative two-way pipeline connects the respectively pneumatic actuator mouth of entering, and the other end connects air supply source simultaneously; Described positive and negative two-way pipeline is carried out by the oil and water filters in casing, three-way cock valve, flow control valve, pressure controlled valve, manual bidirectional valve, described oil and water filters is provided with filter pressure table, described three-way cock valve, flow control valve, pressure controlled valve are combined into respectively one group of overload protection assembly, and two groups of overload protection assemblies are combined into forward and backward overload protection assembly; Its structural design main points are that described air supply source Yi road pipeline tracheae is connected with the oil and water filters in casing; oil and water filters is connected with manual bidirectional valve by the tracheae of same road pipeline; the tracheae that manual bidirectional valve separates two-way pipeline is connected with described two groups of overload protection assemblies respectively, and two groups of overload protection assemblies enter mouthful to be connected by the tracheae of this two-way pipeline and the positive and negative rotation of pneumatic actuator.Above-mentioned oil and water filters filters with separated for the profit entering in casing pipeline, thereby is convenient in gas entrance; Manual bidirectional valve is for the handover operation of forward and backward in pipeline; Overload protection assembly is for the overload protection of positive and negative two-way pipeline, and forward and backward pipeline promotes the output of pneumatic actuator forward and backward gas.
The air outlet end to casing connects successively by manual bidirectional valve end for the pressure controlled valve of described overload protection assembly, flow control valve, three-way cock valve; pressure controlled valve, flow control valve are respectively equipped with pilot pressure table and flow pressure table, and pressure controlled valve Yi road pipeline is connected with three-way cock Fa mono-road pipeline by accessory trachea.The connection order of pressure controlled valve, flow control valve, three-way cock valve, and accessory trachea being connected between pressure controlled valve and three-way cock valve, guaranteed that gas is by entering into output procedure, first stablize air pressure, control again flow, finally by three-way cock valve, export or be back to flow control valve.
The connecting base two ends of described pressure controlled valve are connected with flow control valve, manual bidirectional valve by the tracheae of pipeline respectively, and the pedestal of connecting base is provided with three through holes, connects respectively pilot pressure table, pressure maintaining valve, flow-adjustable valve; Described oil and water filters is provided with pressure regulator valve.The pressure maintaining valve of pressure controlled valve, flow-adjustable valve are respectively used to voltage stabilizing and the Flow-rate adjustment of gas in pressure controlled valve; The pressure regulator valve of oil and water filters is for the gas pressure regulation after oil and water filters.
The flow-adjustable valve body of described flow-adjustable valve is provided with flow-adjustable valve bar, and the flow-adjustable valve bar external diameter between flow-adjustable valve bar and flow-adjustable valve body is provided with valve stem packing ring.By the gas flow in rotation flow-adjustable valve bar regulation valve body; Meanwhile, this flow-adjustable valve also can adopt other existing flow-adjustable valve.
The external diameter sidewall of the valve body central through bore of described pressure maintaining valve is provided with female joint, and female joint is connected with three-way cock Fa mono-road pipeline by pipe joint, accessory trachea.Said structure is Placement and structure concrete between pressure maintaining valve and three-way cock valve, when pressure maintaining valve internal air pressure is too high, by accessory trachea, three-way cock valve, is back to flow control valve.
In the valve body of described pressure maintaining valve, be provided with spool, spring, adjusting plug screw, valve body is stretched out in described adjusting plug screw one end, and is fixed on valve body by place, the aperture spelling cap of valve body central through bore; One end of spring offsets with regulating the other end of plug screw, and the other end of spring and one end of spool offset, and the other end of spool is provided with piston, regulates the adjusting plug screw external diameter between plug screw and valve body to be provided with plug screw seal ring.Said structure is the concrete structure of valve body inner spool, and it is conducive to sealing, voltage stabilizing and pressure buffer in pressure maintaining valve; Meanwhile, this pressure maintaining valve also can adopt other existing pressure maintaining valve.
The two ends of described spring are arranged at respectively in the spring groove that regulates plug screw, spool opposing end surface.Said structure is convenient to the location of spring in valve body, thereby further improves the stability of spring.
According to said structure feature, its overload protection method is characterised in that the gas process manual bidirectional valve actuating after the separated profit of described oil and water filters, control enters forward overload protection assembly or reversion overload protection assembly, thus the forward or reverse of output gas-powered pneumatic actuator; Forward and backward overload protection assembly simultaneously, is crossed gas carrier and is refluxed in corresponding overload protection assembly.Gas backstreaming structure in above-mentioned overload protection assembly, is a kind of overload protecting mechanism, and when overload protection group part internal air pressure is excessive, gas Self-tipping refluxes, and forms loop.
By pressure controlled valve, flow control valve, three-way cock valve, by manual bidirectional valve end, the air outlet end to casing connects successively in backflow in described overload protection assembly, and realize at accessory trachea two ends respectively Bonding pressure control valve, three-way cock valve; Meanwhile, in pressure controlled valve, be provided with flow-adjustable valve and pressure maintaining valve, through gas in the connecting base of pressure controlled valve, pass through the flow-adjustable valve bar adjust flux of flow-adjustable valve, by the valve body inner spool voltage stabilizing of pressure maintaining valve; When the valve body internal air pressure of pressure maintaining valve is excessive, gas push spool moves to adjusting plug screw, spring generation deformation, and the female joint through hole of spool place valve body is opened, gas enters three-way cock valve by female joint, pipe joint, accessory trachea, by three-way cock valve, is back to flow control valve; The valve body internal air pressure of pressure maintaining valve reduces, and spool resets by spring action, and the spool place female joint through hole of valve body is closed.Said structure is concrete return-flow structure and the mode of overload protection assembly, relates to pressure maintaining valve and the flow-adjustable valve of pressure controlled valve, and backflow utilization and overload protection between the pressure controlled valve of accessory trachea, three-way cock valve.
Structural design advantages of simple of the present invention, use, assembling, easy to maintenance, stability, Security, overload protection are effective; The overload protection arrangement that is suitable as pneumatic actuator in pneumatic valve uses, ex hoc genus anne the architecture advances of product.
Accompanying drawing explanation
Fig. 1 is use status architecture schematic diagram of the present invention, and in figure, A portion has done to confine.
Fig. 2 is the A portion structure for amplifying schematic diagram of Fig. 1.
Fig. 3 is pressure controlled valve sectional structure schematic diagram one of the present invention.
Fig. 4 is pressure controlled valve sectional structure schematic diagram two of the present invention.
In figure, the name of sequence number is called: 1, casing, 2, oil and water filters, 3, three-way cock valve, 4, accessory trachea, 5, flow control valve, 6, pressure controlled valve, 601, connecting base, 602, flow-adjustable valve body, 603, flow-adjustable valve bar, 604, valve body, 605, spell cap, 606, regulate plug screw, 607, spring, 608, spool, 609, piston, 610, female joint, 611, pipe joint, 7, manual bidirectional valve.
Embodiment
Now by reference to the accompanying drawings, the invention will be further described.As shown in Figure 1 to 4; in the casing 1 of this overload protection arrangement, be provided with oil and water filters 2, three-way cock valve 3, flow control valve 5, pressure controlled valve 6, manual bidirectional valve 7; the positive and negative rotation that one end of positive and negative two-way pipeline in casing connects the respectively pneumatic actuator mouth of entering, the other end connects air supply source simultaneously.Be after oil and water filters, manual bidirectional valve connect successively, manual bidirectional valve divides two-way pipeline to be connected with one group of forward overload protection assembly, one group of reversion overload protection assembly respectively, and in every group of overload protection assembly, by manual bidirectional valve end, the air outlet end to casing connects successively for pressure controlled valve, flow control valve, three-way cock valve; Meanwhile, pressure controlled valve Yi road pipeline is connected with three-way cock Fa mono-road pipeline by accessory trachea 4, and pressure controlled valve, flow control valve are respectively equipped with pilot pressure table and flow pressure table, and oil and water filters is provided with filter pressure table and pressure regulator valve.
The concrete structure of pressure controlled valve is: connecting base 601 two ends of pressure controlled valve are connected with flow control valve, manual bidirectional valve by the tracheae of pipeline respectively, and the pedestal of connecting base is provided with three through holes, connects respectively pilot pressure table, pressure maintaining valve, flow-adjustable valve.The flow-adjustable valve body 602 of flow-adjustable valve is provided with flow-adjustable valve bar 603, and the flow-adjustable valve bar external diameter between flow-adjustable valve bar and flow-adjustable valve body is provided with valve stem packing ring; The external diameter sidewall of valve body 604 central through bores of pressure maintaining valve is provided with female joint 610, and female joint is connected with three-way cock Fa mono-road pipeline by pipe joint 611, accessory trachea; In the valve body of pressure maintaining valve, be provided with spool 608, spring 607, regulate plug screw 606, valve body is stretched out in described adjusting plug screw one end, and is fixed on valve body by place, the aperture spelling cap 605 of valve body central through bore; One end of spring offsets with regulating the other end of plug screw, and the other end of spring and one end of spool offset, and the two ends of spring are arranged at respectively in the spring groove that regulates plug screw, spool opposing end surface; The other end of spool is provided with piston 609, regulates the adjusting plug screw external diameter between plug screw and valve body to be provided with plug screw seal ring.
Its design principle is as follows: when the pneumatic actuator of pneumatic valve runs well, and stable gas pressure, throughput is stable; Pneumatic actuator running is closed or is unlocked up to pneumatic valve, while exceeding pneumatic valve work torsion, pneumatic actuator running speed slows down, and throughput reduces, and air pressure increases, control valve is opened, flow to three-way cock valve, the air inlet of three-way cock valve is closed, and source of the gas is cut off, pneumatic actuator is died, and assurance pneumatic valve can not turned round bad.In said process, pipeline source of the gas air pressure is within the scope of 1.0MPa.Its working principle is as follows: gas successively the oil and water seperator in casing, manual bidirectional valve, pressure controlled valve, flow control valve, three-way cock valve enter this overload protection arrangement of discharge; and split into two groups of overload protection assemblies at manual bidirectional valve; two groups of overload protection assemblies are one group by pressure controlled valve, flow control valve, three-way cock valve respectively and form, and overload protection assembly is divided into forward and backward overload protection assembly.Pneumatic actuator operating air pressure is at 0.4 MPa-0.45MPa; The pressure regulator valve of oil and water seperator makes air pressure adjustment at 0.7 MPa～0.75 MPa; Manual bidirectional valve is for forward and backward operation; Flow control valve in the running, regulates pressure to be greater than in pressure maintaining valve 0.3～0.35MPa, can promote pressure controlled valve; Pressure controlled valve air pressure is elevated to 0.5-0.7MPa and can be opened, and flow to three-way cock valve; Three-way cock valve is stopped final controlling element air feed.Above-mentioned forward and backward overload protection assembly is each group, can play unlatching, close protective action.
The present invention prevents from damaging because there is air pressure overload in pipeline the component of valve internal, has improved Safety performance, can be widely used in the industries such as pharmacy, chemical industry; And can solve petrochemical industry in using the pneumatic actuator of pneumatic valve, there is no the problem of overload protection arrangement, thereby the blank of domestic this art is filled up in the generation of minimizing accident.
Claims (9)
1. a valve actuator overload protection arrangement, is provided with positive and negative two-way pipeline in the casing of this overload protection arrangement (1), the positive and negative rotation that one end of positive and negative two-way pipeline connects the respectively pneumatic actuator mouth of entering, and the other end connects air supply source simultaneously; Described positive and negative two-way pipeline is carried out by the oil and water filters (2) in casing, three-way cock valve (3), flow control valve (5), pressure controlled valve (6), manual bidirectional valve (7), described oil and water filters is provided with filter pressure table, described three-way cock valve, flow control valve, pressure controlled valve are combined into respectively one group of overload protection assembly, and two groups of overload protection assemblies are combined into forward and backward overload protection assembly; It is characterized in that described air supply source Yi road pipeline tracheae is connected with the oil and water filters (2) in casing (1); oil and water filters is connected with manual bidirectional valve (7) by the tracheae of same road pipeline; the tracheae that manual bidirectional valve separates two-way pipeline is connected with described two groups of overload protection assemblies respectively, and two groups of overload protection assemblies enter mouthful to be connected by the tracheae of this two-way pipeline and the positive and negative rotation of pneumatic actuator.
2. valve actuator overload protection arrangement according to claim 1; the pressure controlled valve (6), flow control valve (5), the three-way cock valve (3) that it is characterized in that described overload protection assembly are held to the air outlet end of casing and are connected successively by manual bidirectional valve (7); pressure controlled valve, flow control valve are respectively equipped with pilot pressure table and flow pressure table, and pressure controlled valve Yi road pipeline is connected with three-way cock Fa mono-road pipeline by accessory trachea (4).
3. valve actuator overload protection arrangement according to claim 2, connecting base (601) two ends that it is characterized in that described pressure controlled valve (6) are connected with flow control valve (5), manual bidirectional valve (7) by the tracheae of pipeline respectively, the pedestal of connecting base is provided with three through holes, connects respectively pilot pressure table, pressure maintaining valve, flow-adjustable valve; Described oil and water filters (2) is provided with pressure regulator valve.
4. valve actuator overload protection arrangement according to claim 3, is characterized in that the flow-adjustable valve body (602) of described flow-adjustable valve is provided with flow-adjustable valve bar (603), and the flow-adjustable valve bar external diameter between flow-adjustable valve bar and flow-adjustable valve body is provided with valve stem packing ring.
5. valve actuator overload protection arrangement according to claim 3; the external diameter sidewall that it is characterized in that valve body (604) central through bore of described pressure maintaining valve is provided with female joint (610), and female joint is connected with three-way cock valve (3) Yi road pipeline by pipe joint (611), accessory trachea (4).
6. valve actuator overload protection arrangement according to claim 3, it is characterized in that being provided with in the valve body (604) of described pressure maintaining valve spool (608), spring (607), regulate plug screw (606), valve body is stretched out in described adjusting plug screw one end, and is fixed on valve body by aperture place's spelling cap (605) of valve body central through bore; One end of spring offsets with regulating the other end of plug screw, and the other end of spring and one end of spool offset, and the other end of spool is provided with piston (609), regulates the adjusting plug screw external diameter between plug screw and valve body to be provided with plug screw seal ring.
7. valve actuator overload protection arrangement according to claim 6, is characterized in that the two ends of described spring (607) are arranged at respectively in the spring groove that regulates plug screw (606), spool (608) opposing end surface.
8. the overload protection method of a valve actuator overload protection arrangement according to claim 1, it is characterized in that gas process manual bidirectional valve (7) actuating after the separated profit of described oil and water filters (2), control enters forward overload protection assembly or reversion overload protection assembly, thus the forward or reverse of output gas-powered pneumatic actuator; Forward and backward overload protection assembly simultaneously, is crossed gas carrier and is refluxed in corresponding overload protection assembly.
9. the overload protection method of valve actuator overload protection arrangement according to claim 8, it is characterized in that the air outlet end to casing connects successively by manual bidirectional valve (7) end by pressure controlled valve (6), flow control valve (5), three-way cock valve (3) for backflow in described overload protection assembly, realize at accessory trachea (4) two ends respectively Bonding pressure control valve, three-way cock valve; Meanwhile, in pressure controlled valve, be provided with flow-adjustable valve and pressure maintaining valve, pass through the interior gas of connecting base (601) of pressure controlled valve by flow-adjustable valve bar (603) adjust flux of flow-adjustable valve, by valve body (604) inner spool (608) voltage stabilizing of pressure maintaining valve; When the valve body internal air pressure of pressure maintaining valve is excessive, gas push spool is to regulating plug screw (606) mobile, there is deformation in spring (607), female joint (610) through hole of spool place valve body is opened, gas enters three-way cock valve by female joint, pipe joint (611), accessory trachea, by three-way cock valve, is back to flow control valve; The valve body internal air pressure of pressure maintaining valve reduces, and spool resets by spring action, and the spool place female joint through hole of valve body is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310652580.8A CN103697201B (en) | 2013-12-05 | 2013-12-05 | Valve actuator overload protection arrangement and overload protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310652580.8A CN103697201B (en) | 2013-12-05 | 2013-12-05 | Valve actuator overload protection arrangement and overload protection method thereof |
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| Publication Number | Publication Date |
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| CN103697201A true CN103697201A (en) | 2014-04-02 |
| CN103697201B CN103697201B (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310652580.8A Expired - Fee Related CN103697201B (en) | 2013-12-05 | 2013-12-05 | Valve actuator overload protection arrangement and overload protection method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218468A (en) * | 2016-03-21 | 2017-09-29 | 淄博柴油机总公司 | Multifunctional combustible gas valve member unit |
| CN107816407A (en) * | 2017-10-24 | 2018-03-20 | 乐志胜 | A kind of antioverloading hydroelectric power generating apparatus |
| CN108035886A (en) * | 2017-12-30 | 2018-05-15 | 唐守林 | A kind of floatation type water plug |
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| US5056374A (en) * | 1988-03-15 | 1991-10-15 | Westinghouse Electric Corporation | Quickly installed load measuring apparatus and associated system |
| CN102518858A (en) * | 2011-12-07 | 2012-06-27 | 珠海经济特区科茂橡塑材料有限公司 | Air pressure overload protection device |
| CN103115171A (en) * | 2013-02-26 | 2013-05-22 | 上海赛凌自控设备有限公司 | Universal pressure regulating valve with overload protection device |
| CN203641599U (en) * | 2013-12-05 | 2014-06-11 | 高国平 | Valve executor overload protecting device |
-
2013
- 2013-12-05 CN CN201310652580.8A patent/CN103697201B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056374A (en) * | 1988-03-15 | 1991-10-15 | Westinghouse Electric Corporation | Quickly installed load measuring apparatus and associated system |
| CN102518858A (en) * | 2011-12-07 | 2012-06-27 | 珠海经济特区科茂橡塑材料有限公司 | Air pressure overload protection device |
| CN103115171A (en) * | 2013-02-26 | 2013-05-22 | 上海赛凌自控设备有限公司 | Universal pressure regulating valve with overload protection device |
| CN203641599U (en) * | 2013-12-05 | 2014-06-11 | 高国平 | Valve executor overload protecting device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218468A (en) * | 2016-03-21 | 2017-09-29 | 淄博柴油机总公司 | Multifunctional combustible gas valve member unit |
| CN107816407A (en) * | 2017-10-24 | 2018-03-20 | 乐志胜 | A kind of antioverloading hydroelectric power generating apparatus |
| CN107816407B (en) * | 2017-10-24 | 2019-11-26 | 瑞安市宏创科技有限公司 | A kind of antioverloading hydroelectric power generating apparatus |
| CN108035886A (en) * | 2017-12-30 | 2018-05-15 | 唐守林 | A kind of floatation type water plug |
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| CN103697201B (en) | 2015-12-16 |
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Effective date of registration: 20151028 Address after: The camel streets in Zhenhai District of Zhejiang Province in 315200 Xingfeng village in Ningbo City Applicant after: GAO GUOPING Address before: 315200 village, 35 village, camel street, Zhenhai District, Zhejiang, Ningbo Applicant before: Gao Guoping |
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