CN110206789A - A kind of mute hydraulic servo oil source apparatus - Google Patents

A kind of mute hydraulic servo oil source apparatus Download PDF

Info

Publication number
CN110206789A
CN110206789A CN201910308959.4A CN201910308959A CN110206789A CN 110206789 A CN110206789 A CN 110206789A CN 201910308959 A CN201910308959 A CN 201910308959A CN 110206789 A CN110206789 A CN 110206789A
Authority
CN
China
Prior art keywords
oil
servo motor
mute
pump
fuel tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910308959.4A
Other languages
Chinese (zh)
Inventor
杨长武
舒永成
王光发
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen NPDA Industrial System Co., Ltd.
China Railway Baoji Railway Electrical Equipment Co Ltd
Original Assignee
Shenzhen Npda Industrial System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Npda Industrial System Co Ltd filed Critical Shenzhen Npda Industrial System Co Ltd
Priority to CN201910308959.4A priority Critical patent/CN110206789A/en
Publication of CN110206789A publication Critical patent/CN110206789A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02Installations or systems with accumulators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04Special measures taken in connection with the properties of the fluid
    • F15B21/042Controlling the temperature of the fluid
    • F15B21/0423Cooling
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00Circuits for servomotor systems
    • F15B2211/80Other types of control related to particular problems or conditions
    • F15B2211/86Control during or prevention of abnormal conditions

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)

Abstract

The present invention provides a kind of mute hydraulic servo oil source apparatus, including fuel tank, servo motor pump group, the servo motor pump group is located at the lower section of the fuel tank, the servo motor pump group includes servo motor and pump, the servo motor is connected with the pump, and the fuel tank is connect with the pump by oil pipe.The beneficial effects of the present invention are: the present invention solves the problems, such as to will appear when the servo motor pump group slow-speed of revolution; so that pump can remain to establish vacuum suction and discharge oil when revolving speed is low; from without in pumping without the vacuum dry wear situation of not no hydraulic oil again simultaneously; the service life of effective protection pump, can operate normally under small-large flow.

Description

A kind of mute hydraulic servo oil source apparatus
Technical field
The present invention relates to hydraulic power technical field more particularly to a kind of mute hydraulic servo oil source apparatus.
Background technique
Traditional material is greatly developed with new material and new structure, major colleges and universities, scientific research institutions, new high-tech enterprise etc. The a large amount of science research and development funds of investment, therefore, the mechanics detection industry of material and structure is also greatly developed, most power It learns in testing laboratory, especially some large-scale mechanics detection devices are largely all made of hydraulic system as a source of power.Liquid There is a common fault in pressure oil source, and noise is big, and calorific value is big, and energy consumption is high.
Present most technology is that selection is immersed in hydraulic system power source stepper motor pump group in hydraulic oil, plays drop It makes an uproar the effect of damping and heat dissipation, the method advantage is obvious, but having a defect is that maintenance is fairly cumbersome, once going wrong, is not allowed Where easily investigation goes wrong, needs entire motor pump group all to split out carry out malfunction elimination, the four of hydraulic oil are caused when splitting out Place's trickling, causes ground wet and slippery, the oil sources big for some flows, motor pump group weighs hundreds of kilograms, and lifting is not easy, and is easy to make It is time-consuming and laborious at security risk.
Also useful servo motor pump group, servo motor pump group energy-saving effect is good, noise wants low with respect to stepping electric-motor pump group Some, servo motor pump group is that there is no problem, but servo motor pump group has a critical defect in small flow in big flow, conventional Gear pump, vane pump etc. have a minimum speed requirement because servo-system has a feedback function, when the stream of hydraulic system When measuring low, feedback signal control oil inlet quantity can be issued, the low revolving speed namely pumped of oil inlet quantity is low, and the oil suction principle of pump is by interior The variation of chamber volume in portion's structure and what the oil suction and oil extraction generated was determined, chamber volume becomes larger as oil suction, become smaller as oil extraction, Becoming larger suddenly makes inside produce moment vacuum, and oil liquid has been pressed into oil sucting cavity by vacuum (atmospheric pressure), this is oil suction principle And oil-absorbing process, in this process, the formation of vacuum with foundation be it is related with revolving speed, revolving speed gets over the generation of condition of high vacuum degree just It is easier, on the contrary it is just smaller, and as soon as revolving speed is as low as the limit, vacuum be can not form, and without vacuum, oil would not be sucked in, Oil cannot suck the idle running to be easy to cause pump, and then wear, so, the feedback function of servo-system is easy general in low discharge Rate causes the damage of pump group.
Summary of the invention
The present invention provides a kind of mute hydraulic servo oil source apparatus, including fuel tank, servo motor pump group, the servo electricity Pump group is located at the lower section of the fuel tank, and the servo motor pump group includes servo motor and pump, the servo motor with it is described Pump is connected, and the fuel tank is connect with the pump by oil pipe.
As a further improvement of the present invention, the pump is mute gear pump, and the mute gear pump and servo motor are logical It crosses shaft coupling to link together, the inlet port of mute gear pump is connect by oil pipe with fuel tank.
As a further improvement of the present invention, the servo motor pump group includes Hydraulic integration plate, the row of mute gear pump Hydraulic fluid port is connect by high-pressure oil pipe with Hydraulic integration plate, equipped with check valve, filter, three-level pressure regulator valve, storage on Hydraulic integration plate Can device, by the mute gear pump be drawn through come hydraulic oil after check valve, filter, three-level pressure regulator valve and accumulator again Executing agency is supplied by oil outlet, the hydraulic oil that executing agency returns is back to fuel tank by oil return opening.
As a further improvement of the present invention, the fuel tank is equipped with oil filler, is equipped with liquid level sensor on the fuel tank And temperature sensor.
As a further improvement of the present invention, which includes water-cooled body, the water cooling But mechanism includes cooling electromechanical pump group, cooling oil inlet pipe, cooling oil return pipe, water cooler, and the water cooler is equipped with cooler Water inlet and cooler water return outlet, the cooling electromechanical pump group is connect by the cooling oil inlet pipe with the fuel tank, described cold But the oil outlet of motor pump group is connect with the oil inlet of the servo motor, and the oil outlet of the servo motor and the water are cooling The oil inlet of device connects, and the oil outlet of the water cooler is connect by the cooling oil return pipe with the fuel tank, the cooling The water inlet and water return outlet and cooling tower of device form water-cooling system.
As a further improvement of the present invention, which further includes oil sources frame, the oil sources Frame is the cavity with opening, and fuel tank is mounted on the upper surface of oil sources frame, and the servo motor pump group is installed on the oil sources Lower portion, the aperture position of the oil sources frame are equipped with door, and the oil sources frame inner surface and/or door inner surface are equipped with Sound-absorbing material.
As a further improvement of the present invention, the sound-absorbing material is lightweight, sound-absorbing, heat-insulated, fire-retardant, etch-proof poly- ammonia Ester foam sound-absorbing material.
As a further improvement of the present invention, which further includes Oil-source control cabinet, oil sources control Cabinet processed is installed on above the oil sources frame.
As a further improvement of the present invention, the servo motor pump group includes motor pump bracket, the servo motor and institute It states pump and links together and be mounted on motor pump bracket, the motor pump bracket is mounted on the bottom plate of oil sources frame.
The beneficial effects of the present invention are: the present invention solves the problems, such as to will appear when the servo motor pump group slow-speed of revolution, so that Pump can remain to establish vacuum suction and discharge oil when revolving speed is low, without the vacuum not dry grinding of hydraulic oil again simultaneously out of without pump Damage situation, the service life of effective protection pump, can operate normally under small-large flow.
Detailed description of the invention
Fig. 1 is axis surveys view of the invention;
Fig. 2 is that the rear optical axis of the invention surveys view.
Specific embodiment
As shown in Figure 1, 2, the invention discloses a kind of mute hydraulic servo oil source apparatus, including fuel tank 10, servo motor Pump group, the servo motor pump group are located at the lower section of the fuel tank 10, and the servo motor pump group includes servo motor 2 and pumps, The servo motor 2 is connected with the pump, and the fuel tank 10 is connect with the pump by oil pipe.
Fuel tank 10 is provided with hydraulic oil, and when required flow is small, servo motor 2, which issues signal, reduces the revolving speed of pump, Because fuel tank 10 is on the top of servo motor pump group, when revolution speed reduces, in pump and in oil pipe because the gravity of hydraulic oil still Certain pressure so is had, this pressure makes pump that can remain to establish vacuum suction and discharge oil when revolving speed is low, from without nothing in pumping The vacuum dry wear situation of not no hydraulic oil again simultaneously, the service life of effective protection pump.
The lower section that servo motor pump group of the present invention is located at fuel tank 10 includes: that servo motor pump group is located at fuel tank 10 Underface, alternatively, servo motor pump group is located at the oblique underface of fuel tank 10;The position of servo motor pump group and fuel tank 10, as long as It can guarantee that the gravity when revolution speed reduces, in pump and in oil pipe because of hydraulic oil still suffers from certain pressure.
The servo motor pump group includes Hydraulic integration plate 20, and the pump is mute gear pump 3, the mute gear pump 3 It is linked together with servo motor 2 by shaft coupling, the inlet port of mute gear pump 3 is connect by oil pipe with fuel tank 10, mute The oil discharge outlet of gear pump 3 is connect by high-pressure oil pipe with Hydraulic integration plate 20, equipped with check valve 8, filtering on Hydraulic integration plate 20 Device 7, three-level pressure regulator valve 6, accumulator 5, by mute gear pump 3 be drawn through come hydraulic oil by check valve 8, filter 7, three-level Executing agency is supplied by oil outlet 17 again after pressure regulator valve 6 and accumulator 5, the hydraulic oil that executing agency returns passes through oil return opening 16 It is back to fuel tank 10.
The fuel tank 10 is equipped with oil filler 13, is equipped with liquid level sensor 11 and temperature sensor 12 on the fuel tank 10.
The mute hydraulic servo oil source apparatus includes water-cooled body, and the water-cooled body includes cooling electromechanical pump group 14, cooling oil inlet pipe 21, cooling oil return pipe 22, water cooler 15, the water cooler 15 are equipped with cooler water inlet 19 and cold But device water return outlet 18, the cooling electromechanical pump group 14 are connect by the cooling oil inlet pipe 21 with the fuel tank 10, the cooling The oil outlet of motor pump group 14 is connect with the oil inlet of the servo motor 2, the oil outlet of the servo motor 2 and the water cooling But the oil outlet of the oil inlet connection of device 15, the water cooler 15 connects by the cooling oil return pipe 22 with the fuel tank 10 It connects, the water inlet 19 and water return outlet 18 and cooling tower of the cooler 15 form water-cooling system.
In the present invention, fuel tank 10, servo motor pump group, water-cooled body are three independent systems, water-cooled body It is a set of individual cooling system, 10 responsible fuel feeding of fuel tank, servo motor pump group is mounted on 10 outside of fuel tank, intermediate there was only oil Pipe connection only individually need to be checked and be repaired if any one system jam, very convenient.
Servo motor pump group of the invention is further noise reduction, to meet laboratory than stepper motor pump group low noise The environmental requirement of environment, which further includes oil sources frame 1, and the oil sources frame 1 is with opening Cavity, fuel tank 10 is mounted on the upper surface of oil sources frame 1, and the servo motor pump group is installed on inside the oil sources frame 1, institute The aperture position for stating oil sources frame 1 is equipped with door, and 1 inner surface of oil sources frame and/or door inner surface are equipped with lightweight, inhale Sound, heat-insulated, fire-retardant, etch-proof polyurethane foam sound-absorbing material, it is significant by the noise reduction effect in kind substantially worked it out, it obtains The consistent favorable comment of major Scientific Research in University Laboratory.
Certainly, for further noise reduction, water-cooled body can also be mounted on inside oil sources frame 1.
The mute hydraulic servo oil source apparatus further includes Oil-source control cabinet 9, and Oil-source control cabinet 9 is installed on the oil sources frame 1 top.
The servo motor pump group includes motor pump bracket 4, and the servo motor 2 links together with the pump and is mounted on electricity On pump frame 4, the motor pump bracket 4 is mounted on the bottom plate of oil sources frame 1.
Fuel tank 10, servo motor pump group, water-cooled body are independently arranged by the present invention, are occurred in any one equipment It will not interfere with other equipment when Breakdown Maintenance, while increasing fire-retardant, corrosion-resistant polyurethane foam sound-absorbing inside oil sources frame 1 Material, after shutting door, noise when operation is at 60 decibels hereinafter, it can put in any laboratory or workshop, again Keep the change a place to cover up, or even is individually for one house of oil sources dynamical system lid for noise reduction.Meanwhile the present invention It solves the problems, such as to will appear when servo motor pump group minimum speed, can be operated normally under small-large flow.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention Protection scope.

Claims (9)

1. a kind of mute hydraulic servo oil source apparatus, it is characterised in that: including fuel tank, servo motor pump group, the servo motor Pump group is located at the lower section of the fuel tank, and the servo motor pump group includes servo motor and pump, the servo motor and the pump It is connected, the fuel tank is connect with the pump by oil pipe.
2. mute hydraulic servo oil source apparatus according to claim 1, it is characterised in that: the pump is mute gear pump, The mute gear pump and servo motor are linked together by shaft coupling, and the inlet port of mute gear pump passes through oil pipe and fuel tank Connection.
3. mute hydraulic servo oil source apparatus according to claim 2, it is characterised in that: the servo motor pump group includes The oil discharge outlet of Hydraulic integration plate, mute gear pump is connect by high-pressure oil pipe with Hydraulic integration plate, equipped with single on Hydraulic integration plate To valve, filter, three-level pressure regulator valve, accumulator, by the mute gear pump be drawn through come hydraulic oil by check valve, filtering Executing agency is supplied by oil outlet again after device, three-level pressure regulator valve and accumulator, the hydraulic oil that executing agency returns passes through oil return Mouth is back to fuel tank.
4. mute hydraulic servo oil source apparatus according to claim 3, it is characterised in that: the fuel tank is equipped with oil filler, Liquid level sensor and temperature sensor are installed on the fuel tank.
5. mute hydraulic servo oil source apparatus according to claim 1, it is characterised in that: the mute hydraulic servo oil sources dress It sets including water-cooled body, the water-cooled body includes cooling electromechanical pump group, cooling oil inlet pipe, cooling oil return pipe, water cooling Device, the water cooler be equipped with cooler water inlet and cooler water return outlet, the cooling electromechanical pump group by the cooling into Oil pipe is connect with the fuel tank, and the oil outlet of the cooling electromechanical pump group is connect with the oil inlet of the servo motor, described to watch The oil outlet for taking motor is connect with the oil inlet of the water cooler, and the oil outlet of the water cooler passes through the cooling oil return Pipe is connect with the fuel tank, and the water inlet and water return outlet and cooling tower of the cooler form water-cooling system.
6. mute hydraulic servo oil source apparatus according to any one of claims 1 to 5, it is characterised in that: this is mute hydraulic Hydraulic servo system device further includes oil sources frame, and the oil sources frame is the cavity with opening, and fuel tank is mounted on oil sources frame Above, the servo motor pump group is installed on the oil sources lower portion, and the aperture position of the oil sources frame is equipped with door, institute It states oil sources frame inner surface and/or door inner surface is equipped with sound-absorbing material.
7. mute hydraulic servo oil source apparatus according to claim 6, it is characterised in that: the sound-absorbing material be lightweight, Sound-absorbing, heat-insulated, fire-retardant, etch-proof polyurethane foam sound-absorbing material.
8. mute hydraulic servo oil source apparatus according to claim 6, it is characterised in that: the mute hydraulic servo oil sources dress Setting further includes Oil-source control cabinet, and Oil-source control cabinet is installed on above the oil sources frame.
9. mute hydraulic servo oil source apparatus according to claim 6, it is characterised in that: the servo motor pump group includes Motor pump bracket, the servo motor and the pump link together and are mounted on motor pump bracket, and the motor pump bracket is mounted on oil On the bottom plate of source frame.
CN201910308959.4A 2019-04-17 2019-04-17 A kind of mute hydraulic servo oil source apparatus Pending CN110206789A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910308959.4A CN110206789A (en) 2019-04-17 2019-04-17 A kind of mute hydraulic servo oil source apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910308959.4A CN110206789A (en) 2019-04-17 2019-04-17 A kind of mute hydraulic servo oil source apparatus

Publications (1)

Publication Number Publication Date
CN110206789A true CN110206789A (en) 2019-09-06

Family

ID=67785476

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910308959.4A Pending CN110206789A (en) 2019-04-17 2019-04-17 A kind of mute hydraulic servo oil source apparatus

Country Status (1)

Country Link
CN (1) CN110206789A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201456361U (en) * 2009-06-01 2010-05-12 宁波创基机械有限公司 Mute hydraulic power source for plastic-injection molding machine
CN102828839A (en) * 2012-09-14 2012-12-19 李恒 Double-fuel oil path control system
US20150337877A1 (en) * 2013-10-18 2015-11-26 Komatsu Ltd. Work vehicle and control method for same
CN204851859U (en) * 2015-07-10 2015-12-09 重庆市博平液压机械有限公司 Servo energy -saving hydraulic station
CN106337856A (en) * 2016-08-31 2017-01-18 德玛仕电液技术(苏州)有限公司 Servo hydraulic device
CN206299644U (en) * 2016-10-21 2017-07-04 东莞市通兴液压科技有限公司 A kind of electromechanical integration servo-drive fluid pressure type device
US20170234338A1 (en) * 2014-08-06 2017-08-17 Robert Bosch Gmbh Hydrostatic Drive
CN208236819U (en) * 2018-05-14 2018-12-14 浙江万丰科技开发股份有限公司 A kind of hydraulic servo motor driven systems
CN109372830A (en) * 2018-12-12 2019-02-22 重庆凯瑞汽车试验设备开发有限公司 Hydraulic servo system device
CN210265357U (en) * 2019-04-17 2020-04-07 深圳市恩普达工业系统有限公司 Mute hydraulic servo oil source device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201456361U (en) * 2009-06-01 2010-05-12 宁波创基机械有限公司 Mute hydraulic power source for plastic-injection molding machine
CN102828839A (en) * 2012-09-14 2012-12-19 李恒 Double-fuel oil path control system
US20150337877A1 (en) * 2013-10-18 2015-11-26 Komatsu Ltd. Work vehicle and control method for same
US20170234338A1 (en) * 2014-08-06 2017-08-17 Robert Bosch Gmbh Hydrostatic Drive
CN204851859U (en) * 2015-07-10 2015-12-09 重庆市博平液压机械有限公司 Servo energy -saving hydraulic station
CN106337856A (en) * 2016-08-31 2017-01-18 德玛仕电液技术(苏州)有限公司 Servo hydraulic device
CN206299644U (en) * 2016-10-21 2017-07-04 东莞市通兴液压科技有限公司 A kind of electromechanical integration servo-drive fluid pressure type device
CN208236819U (en) * 2018-05-14 2018-12-14 浙江万丰科技开发股份有限公司 A kind of hydraulic servo motor driven systems
CN109372830A (en) * 2018-12-12 2019-02-22 重庆凯瑞汽车试验设备开发有限公司 Hydraulic servo system device
CN210265357U (en) * 2019-04-17 2020-04-07 深圳市恩普达工业系统有限公司 Mute hydraulic servo oil source device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张利平: "液压气动系统设计手册", 30 June 1997, 机械工业出版社, pages: 215 *

Similar Documents

Publication Publication Date Title
CN104504970B (en) Small-sized cavitation test device based on pressure control
CN104671318A (en) Pump dissolving type air floating system
CN105089576A (en) Coalbed methane discharge and mining method and device
CN110206789A (en) A kind of mute hydraulic servo oil source apparatus
CN110454137A (en) A kind of blowdown apparatus of natural gas air inlet separator mesolow liquid
CN201801948U (en) Normally-hung vacuum water guide starting device of centrifugal pump
CN112762340A (en) Cooling integrated lubricating oil tank
CN208734560U (en) Water Quenching Slag industrial water pump
CN210265357U (en) Mute hydraulic servo oil source device
CN108087322A (en) A kind of lubricating system of turbo compressor unit
CN108317254A (en) A kind of current-limiting apparatus of plumbing for building equipment robot control system(RCS)
CN204508868U (en) The molten formula air-flotation system of pump
CN207961037U (en) A kind of lubricating system of turbo compressor unit
CN209530281U (en) A kind of Large Hydroelectric Set water pilot bearing online oil filtration system
CN208686606U (en) A kind of condenser pump
CN206191235U (en) Modular lubricating system
CN209393040U (en) A kind of micro-nano air bubble machine of intelligence
CN109903668A (en) A kind of multifunctional water pump experimental provision
CN207740181U (en) A kind of double outlet multipurpose external-mix self-priming pumps with similar spiral shape suction chamber
CN205981651U (en) Water tank advances drainage valve flow and sealing performance detection device
CN207830278U (en) A kind of marine minitype hydraulic device testboard
CN105674420B (en) A kind of purifying sterilizing humidification dehumidifying integrated machine
CN208870113U (en) A kind of pressurization water supply pumping plant
CN207936785U (en) One kind is for the hybrid energy conserving system of plant condenser auxiliary kinetic energy machinery
CN207750202U (en) Multistage turbine vacuum pump lubricates EFM Electronic Fuel Management

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20200121

Address after: 518000 1, south of F building, Santou industrial community, Baoan District, Shiyan street, Shiyan street, Shenzhen, Guangdong.

Applicant after: Shenzhen NPDA Industrial System Co., Ltd.

Applicant after: CHINA RAILWAY BAOJI RAILWAY ELECTRICAL EQUIPMENT CO., LTD.

Address before: 518000 1, south of F building, Santou industrial community, Baoan District, Shiyan street, Shiyan street, Shenzhen, Guangdong.

Applicant before: Shenzhen NPDA Industrial System Co., Ltd.