CN107575392A - Jing Yin centrifugal multistage pump multiple centrifugal pump - Google Patents
Jing Yin centrifugal multistage pump multiple centrifugal pump Download PDFInfo
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- CN107575392A CN107575392A CN201610522295.8A CN201610522295A CN107575392A CN 107575392 A CN107575392 A CN 107575392A CN 201610522295 A CN201610522295 A CN 201610522295A CN 107575392 A CN107575392 A CN 107575392A
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Abstract
The present invention relates to a kind of Jing Yin centrifugal multistage pump multiple centrifugal pump, it includes the pump housing, frequency-variable controller and the integrated liquid cooling variable-frequency motor of motor, is socketed with the pump shaft of axle sleeve and spacer ring, the sliding bearing being socketed on the outside of axle sleeve, the liquid cooling motor that pump shaft rotates, the impeller being plugged on pump shaft are driven with the joining shaft coupling of pump shaft, by shaft coupling, and multiple passes through steel band fastening and stator that mutually tandem coordinates.The Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention eliminates noise caused by traditional ventilated machine fan, while motor hinders the route of transmission of motor noise by motor inner housing and shell body dual sealing, reduces the noise of centrifugal pump due to using liquid cooling motor；The Jing Yin centrifugal multistage pump multiple centrifugal pump frequency-variable controller of the present invention is integrated on motor, reduces switch board volume, reduces the manufacturing cost of variable frequency pump system system.Its other frequency-variable controller devises powerful communication function.
Description
Technical field
The present invention relates to industrial liquid conveying and urban water supply and sewerage field, more particularly to a kind of liquid cooling frequency-variable controller
With the motor-driven stainless steel centrifugal multistage pump multiple centrifugal pump of motor integration-in-one.
Background technology
Conveying and urban water supply and sewerage, skyscraper pressurized water supply of the centrifugal multistage pump multiple centrifugal pump applied to industrial liquid, gardens sprinkling irrigation,
Fire fighting pressurization, send the cold-warm waters such as water, heating, bathroom circularly-supercharged at a distance and air-conditioner set circulation, cooling water conveying etc..
It is standard industry motor that motor is most of used by centrifugal multistage pump multiple centrifugal pump at present, and most of constant speed operates in power frequency
Rotating speed（50Hz）.And in practical application（Such as building living water）In, water pump system does not need work in most of working time
Make in metered flow, rated head, and need to be operated in partial load condition（The flow that i.e. actual pump system needs is less than volume
Constant flow or required lift are less than rated head）, this can be realized by reducing the rotating speed of centrifugal pump.To centrifugal pump
For, power of motor consumption is approximate directly proportional to the cube of rotating speed.The work of centrifugal multistage pump multiple centrifugal pump constant speed will cause the waste of the energy,
So as to aggravate the pollution to environment.Present solution method is to add the scheme of frequency-conversion control cabinet using centrifugal multistage pump multiple centrifugal pump.With section
The continuous improvement of energy environmental requirement, the situation using VFC centrifugal multistage pump multiple centrifugal pump and pump group are more and more.But due to frequency conversion control
The introducing of device processed is, it is necessary to design the electronic component that independent frequency-conversion control cabinet is used to arrange frequency-variable controller and some auxiliary.
So that system becomes more complicated, and because frequency-conversion control cabinet volume is larger so that whole variable frequency water pump system installation is empty
Between substantially increase.On the other hand for the higher application places of noise requirements, such as house, business office, hotel etc., mark
Quasi- industrial motor is difficult the requirement for meeting client.The method for reducing noise mainly has two：First, reduce the vibration work(of noise source
Rate, second, obstruction or cutting off its route of transmission.The pursuit that noise source oscillation power is projector all the time is reduced, but
It is that difficulty is larger, cost is higher.Hinder or cut-out noise transmission paths can also effectively reduce noise level, but need compared with
Big space, while cost is high.
The liquid cooling centrifugal multistage pump multiple centrifugal pump of the present invention eliminates the cooling in conventional motors due to using liquid cooling motor
With fan, a noise source is eliminated, while motor hinders motor noise by motor inner housing and shell body dual sealing
Route of transmission, the noise of motor is reduced, so as to reduce the noise of centrifugal pump；On the other hand, Jing Yin multistage of the invention
Centrifugal pump uses frequency-variable controller and motor integrated form frequency conversion liquid cooling motor.Due to frequency-variable controller and the collection of motor integral
Accepted way of doing sth integrative-structure, can reduce frequency-conversion control cabinet volume, and certain applications can remove frequency-conversion control cabinet, save product manufacturing into
This, saves installing space.
The powerful communication function of controller design of the frequency variation multiple stage centrifugal pump of the present invention includesUsing wireless blue tooth
Technology is realized passes through application program operational control frequency variation multiple stage centrifugal pump system on the mobile apparatus；Pass through GPRS（General point
Group wireless service technology）Realize wireless remote monitering；Pass through industrial bus agreement（Such as RS485, Modbus）Realize networking
WithIt is configured with touch screen operation panel and realizes local operation.
The content of the invention
The purpose of the present invention is, cost height and noise big for frequency-conversion control cabinet volume in the application of multistage centrifugal pump frequency conversion
The problem of high, there is provided the integrated low noise centrifugal multistage pump multiple centrifugal pump solution of a kind of frequency-variable controller and motor.
To achieve the above object, the invention provides a kind of centrifugal multistage pump multiple centrifugal pump, including：
The pump housing, positioned at the centrifugal pump bottom, the pump housing includes fluid intake and outlet；
Pump shaft, axially it is contained in the pump housing, axle sleeve and wheel space ring is socketed with the pump shaft；
Sliding bearing, it is socketed on the outside of the axle sleeve, slidably supports the pump shaft；
Impeller, it is plugged on the pump shaft and the wheel rotation is driven by the wheel space ring axially position, the pump shaft,
So as to which the fluid entered from the pump housing suction inlet be pressurizeed；
Stator, on the outside of the axle sleeve, the liquid to be pressurizeed by the impeller stator as described in chopped-off head is collected and reduces stream
Speed, continue pressurization into impeller described in next stage until liquid is discharged from the outlet and is sent into water supply system；
Liquid cooling motor, by the integrated liquid cooling motor of frequency-variable controller and motor, as prime mover of multistage pump,
Pump shaft is driven to rotate.It is axially mounted to the pump housing upper end by electric machine support, and the electric machine support passes through tension with the pump housing
Bolt is locked；The electric machine support has support inner casing and rack shell, the company of being formed between the support inner casing and rack shell
Lead to the guiding fluid hole of the pump housing chamber；The housing of the liquid cooling motor by motor inner casing and motor comprising motor stator outside
Shell is formed, runner of the screw-shaped flow paths as motor coolant between the motor inner casing and electrode shell, and cooling liquid is timely
Heat caused by motor and frequency-variable controller is taken away, reduce the temperature of motor and frequency-variable controller；For accommodating described
The chamber of impeller and stator has the outlet of liquid back pipe described in outer barrel and inner cylinder to the entrance of the pump housing；
Motor shaft, axially it is contained among the motor inner casing of the liquid cooling motor, is driven by the liquid cooling motor
Turn is moved；
Rolling bearing, motor shaft described in rolling support；
Shaft coupling, for coupling the motor shaft and pump shaft, the liquid cooling motor passes through the motor shaft and shaft coupling band
The dynamic pump shaft rotates；
Two side positions of the pump shaft through the electric machine support use mechanical seal, to separate the entrance of the fluid in the pump housing
The electric machine support.
Wherein, the rolling bearing includes front end rolling bearing and rear end rolling bearing, is respectively used to described in rolling support
The front and rear end of motor shaft, the front end rolling bearing are arranged on the top of the electric machine support, and the motor shaft passes through institute
Stretch into the electric machine support after stating front end rolling bearing and be connected by the shaft coupling with the pump shaft.
Wherein, the rolling bearing is angular contact deep groove ball bearing, to make it have the bearing capacity of axial load.
Further, screw-shaped flow paths are devised on the motor inner casing, the passage flowed as cooling liquid, timely
Take away caused heat in motor and the frequency-variable controller course of work.Sealing ring is used between the motor inner casing and electrode shell
Sealing.
Wherein, impeller described in chopped-off head passes through axle sleeve axle by axis head nut axially position between chopped-off head and second level impeller
To positioning, pass through the wheel space ring axially position between remaining impeller at different levels.
Further, there are multiple projections radially fixed on multiple grooves of pump shaft outer wall on the inner ring of the impeller.
Wherein, one end of stator described in chopped-off head is plugged on the axle sleeve, and the other end of stator described in chopped-off head is led with remaining
Coordinated between leaf by steel band tandem and positioned.
Wherein, interference fit is led between the axle sleeve and stator to be assembled together, is between the sliding bearing and axle sleeve
Gap coordinates.
The Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention uses liquid cooling motor, eliminates cooling fan in conventional motors, disappears
Except a noise source, while motor is hindered the propagation of noise, reduced by motor inner casing and motor housing dual sealing
The noise of motor, so as to reduce the noise of centrifugal pump；On the other hand, frequency-variable controller and motor are integrated, it is possible to reduce
Switch board volume, frequency-conversion control cabinet can be removed in certain applications, save cost of goods manufactured, while save installing space.
In the course of work of centrifugal multistage pump multiple centrifugal pump, the stator and frequency-variable controller of motor are cooled down by liquid circulation, motor and frequency conversion control
Caused heat is taken away in time in the device course of work processed, reduces the temperature of motor and frequency-variable controller.
The powerful communication function of controller design of the Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention includesUsing wireless blue tooth
Technology is realized passes through application program operational control frequency variation multiple stage centrifugal pump system on the mobile apparatus；Pass through GPRS（General point
Group wireless service technology）Realize wireless remote monitering；Pass through industrial bus agreement（Such as RS485, Modbus）Realize networking
WithConfiguration touch screen operation panel realizes local operation.
Brief description of the drawings
Fig. 1 is the schematic diagram of the Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention；
Numeral represents in figure：
1. the sliding bearing of 2. impeller of steel band 3.
4. the turnbuckle of 5. stator of axle sleeve 6.
7. the front end rolling bearing of 8. guiding fluid hole of mechanical seal 9.
10. the rear end rolling bearing of 11. liquid cooling motor of motor housing 12.
13. the outer barrel of 14. pump housing of frequency-variable controller 15.
16. the shaft coupling of 17. pump shaft of wheel space ring 18.
19. the liquid back pipe of 20. sealing ring of support 21.
22. the sealing ring of 23. screw-shaped flow paths of motor inner casing 24.
Embodiment
Below by drawings and examples, technical scheme is described in further detail.
For by taking two-stage as an example, the schematic diagram of the Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention is as shown in figure 1, specifically include：Steel band 1, leaf
Wheel 2, sliding bearing 3, axle sleeve 4, stator 5, turnbuckle 6, mechanical seal 7, guiding fluid hole 8, front end rolling bearing 9, motor housing
10th, liquid cooling motor 11, rear end rolling bearing 12, frequency-variable controller 13, the pump housing 14, outer barrel 15, wheel space ring 16, pump shaft
17th, shaft coupling 18, support 19, sealing ring 20, liquid back pipe 21, motor inner casing 22, screw-shaped flow paths 23 and sealing ring 24.
Pump shaft 17 is contained in impeller 2 and stator 5, and impeller 2 is plugged on pump shaft 17, and pump shaft 17 is socketed with axle sleeve 4 and leaf
Take turns spacer ring 16.Sliding bearing 3 is socketed in the inner side of axle sleeve 4, slides radial support pump shaft 17, is between sliding bearing 3 and axle sleeve 4
Gap coordinates.Axle sleeve 4 is using interference fit on stator 5.The major function of wheel space ring 16 is the axle between impeller 2
To positioning.
Pump shaft 17 is supported by axle sleeve 4 using sliding bearing 3.The motor shaft of liquid cooling motor 11 passes through the front end axis of rolling
Hold 9 and rear end rolling bearing 12 support, front end rolling bearing 9 is typically the angular contact deep-groove ball of axial load bearing capacity
Bearing and rear end rolling bearing 12 use common deep groove ball bearing, if axial load is excessive, rear end rolling bearing 12 also uses
Angular contact deep groove ball bearing.Pump shaft 17 is connected by shaft coupling 18 with motor shaft, and outside liquid cooling motor 11 passes through shaft coupling
Device 18 drives pump shaft 17 to rotate, and the impeller 2 of pump shaft 17 rotates, so as to which the fluid sucked from the pump housing 14 be pressurizeed.Stator 5 is mutual
Tandem coordinates, and is tightened together by steel band 1, is collected by the fluid under pressure of impeller 2 by stator 5 and reduce flow velocity, and led to
Cross the discharge of the outlet of the pump housing 14.
First stage impeller 2 is axially fixed by axle sleeve 4 between the first order and second level impeller by axis head nut axially position
, pass through the axially position of wheel space ring 16 between remaining each impeller 2.Have multiple projections radially fixed on the inner ring of impeller 2
On multiple grooves of pump shaft 17.
The effect of stator 5 is that the liquid that impeller 2 is thrown away collects, and makes the flow velocity of liquid reduce, partial velocity
After pressure energy being changed into, then it is uniformly introduced next stage or is sent into fluid pipe network system by the discharge of the outlet of the pump housing 14.
Stator 5 makes liquid be flowed in continuous runner, is not easy to form dead angle and suddenly diffusion, and fluid velocity changes than more uniform, water
Power is functional.
According to different impeller diameters and different series, it can be that centrifugal multistage pump multiple centrifugal pump configures multiple sliding bearings 3, pass through tune
The quantity optimization of whole sliding bearing 3, it is ensured that centrifugal multistage pump multiple centrifugal pump safe and stable operation.
Guiding fluid hole 8 is opened on electric machine support 19, the circulation canal as cooling motor liquid.Liquid is from centrifugal pump high pressure chest
Liquid is introduced between motor inner casing 22 and motor housing 10 by the guiding fluid hole 8 on electric machine support 19 and is distributed in motor inner casing 22
On screw-shaped flow paths 23 in, cooling liquid is directly connected to the entrance structure of the pump housing 14 by screw-shaped flow paths 23 by liquid back pipe 21
Into the circulatory system.The liquid for cooling down motor is sealed by sealing ring 20 and sealing ring 24 with extraneous.It is worked in centrifugal multistage pump multiple centrifugal pump
Cheng Zhong, the circulating liquid in screw-shaped flow paths 23 timely take away heat caused by frequency-variable controller 13 and motor stator, all the time
Frequency-variable controller 13 and motor is allowed to be maintained at one with respect to temperature relatively low for ventilated machine.
Variable flow and the demand of lift, liquid cooling motor 11 are connect by frequency-variable controller 13 according in practical application
Receive feedback signal, the rotating speed of regulation motor, so as to realize the regulation of flow and lift.In order to realize the Consumer's Experience of close friend,
Touch panel is provided with frequency-variable controller 13.In order to realize networking and communication, frequency-variable controller 13 devises wireless blue tooth
Technology, realization pass through the Jing Yin multistage centrifugal pumping system of application program operational control frequency conversion on the mobile apparatus.Frequency-variable controller 13
It is provided with GPRS（General packet radio service technology）Module, realize wireless remote monitering and be configured with industrial bus agreement
（Such as RS485, Modbus）Realize networking.
The pump shaft 17 of the Jing Yin centrifugal multistage pump multiple centrifugal pump of the present invention is directly driven by shaft coupling 18 by liquid cooling motor 11, pump
The impeller 2 of axle 17 is liquid pumping to the lift specified.Jing Yin centrifugal multistage pump multiple centrifugal pump passes through liquid by the suction inlet of the pump housing 14
Impeller 2 sucks Jing Yin centrifugal multistage pump multiple centrifugal pump, and liquid enters subordinate's impeller 2 after the pressurization of impeller 2, by stator 5 to be continued to pressurize,
Then enter next stage impeller by subordinate's stator 5 to pressurize, until leading by final stage after by the pressure process of impeller 2 terminating
Leaf 5 is discharged, and last Jing Yin centrifugal multistage pump multiple centrifugal pump passes through the liquid of high pressure the runner that is formed between stator 5 and outer barrel 15 from the pump housing 14
Outlet be sent into pipe-line system.
According to the requirement of pumped (conveying) medium, corresponding material can be selected in Jing Yin centrifugal multistage pump multiple centrifugal pump of the invention, such as stainless steel, titanium
Corrosion resistant material that alloy etc. is antirust.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (10)
- A kind of 1. Jing Yin centrifugal multistage pump multiple centrifugal pump, it is characterised in that including：The pump housing, positioned at the centrifugal pump bottom, the pump housing includes fluid intake and outlet；Pump shaft, axially it is contained in the pump housing, axle sleeve and wheel space ring is socketed with the pump shaft；Sliding bearing, it is socketed on the outside of the axle sleeve, slidably supports the pump shaft；Impeller, it is plugged on the pump shaft and the wheel rotation is driven by the wheel space ring axially position, the pump shaft, So as to which the fluid entered from the pump housing suction inlet be pressurizeed；Stator, on the outside of the axle sleeve, the liquid to be pressurizeed by the impeller stator as described in chopped-off head is collected and reduces stream Speed, continue pressurization into impeller described in next stage until liquid is discharged from the outlet and is sent into pipe network system；Liquid cooling motor, by the integrated motor by liquid cooling of frequency-variable controller and motor, as multistage pump Prime mover, driving pump shaft rotate.It is axially mounted to the pump housing upper end by electric machine support, and the electric machine support leads to the pump housing Cross turnbuckle locking；The electric machine support has support inner casing and rack shell, between the support inner casing and rack shell Form the guiding fluid hole for connecting the pump housing chamber；The housing of the liquid cooling motor by the motor inner casing comprising motor stator and Motor housing is formed, runner of the screw-shaped flow paths as motor coolant between the motor inner casing and electrode shell, cooling Liquid timely takes away heat caused by motor and frequency-variable controller by screw-shaped flow paths；For housing the impeller and leading The chamber of leaf has outer barrel and inner cylinder；The outlet of the liquid back pipe to the pump housing entrance；Motor shaft, axially it is contained among the motor inner casing of the liquid cooling motor, is driven by the liquid cooling motor Turn is moved；Rolling bearing, motor shaft described in rolling support；Shaft coupling, for coupling the motor shaft and pump shaft, the liquid cooling motor passes through the motor shaft and shaft coupling band The dynamic pump shaft rotates；Two side positions of the pump shaft through the electric machine support use mechanical seal, to separate the entrance of the fluid in the pump housing The electric machine support.
- 2. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the rolling bearing includes the front end axis of rolling Hold with rear end rolling bearing, be respectively used to the front and rear end of motor shaft described in rolling support, the front end rolling bearing is set On the top of the electric machine support, the motor shaft is stretched into the electric machine support and passed through after passing through the front end rolling bearing The shaft coupling is connected with the pump shaft.
- 3. liquid cooling motor according to claim 1, it is characterised in that the liquid cooling motor is frequency-variable controller The integral structure integrated with motor, frequency-variable controller and motor body pass through point, the form connection in line or face.
- 4. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 2, it is characterised in that the rolling bearing is angular contact deep-groove ball Bearing, to make it have the bearing capacity of axial load.
- 5. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that spiral stream is devised on motor inner housing Road, the screw-shaped flow paths are as cooling motor and the passage of frequency-variable controller liquid circulation.
- 6. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that impeller described in chopped-off head passes through axis head nut axle To positioning, by axle sleeve axially position between chopped-off head and second level impeller, pass through the wheel space between remaining impeller at different levels Ring axially position.
- 7. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that have multiple projections on the inner ring of the impeller It is radially fixed on multiple grooves of pump shaft outer wall.
- 8. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that one end of stator described in chopped-off head is plugged on institute State on axle sleeve, coordinated between the other end of stator described in chopped-off head and remaining stator by steel band tandem and positioned.
- 9. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that between the motor inner casing and electrode shell Sealed using sealing ring.
- 10. Jing Yin centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that its frequency-variable controller is configured with powerful lead to Communication function, such as wireless blue tooth technology, GPRS (general packet radio service technology) and industrial bus agreement (such as RS485, Modbus)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522295.8A CN107575392A (en) | 2016-07-05 | 2016-07-05 | Jing Yin centrifugal multistage pump multiple centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610522295.8A CN107575392A (en) | 2016-07-05 | 2016-07-05 | Jing Yin centrifugal multistage pump multiple centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107575392A true CN107575392A (en) | 2018-01-12 |
Family
ID=61049426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610522295.8A Withdrawn CN107575392A (en) | 2016-07-05 | 2016-07-05 | Jing Yin centrifugal multistage pump multiple centrifugal pump |
Country Status (1)
| Country | Link |
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| CN (1) | CN107575392A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488103A (en) * | 2018-06-26 | 2018-09-04 | 杭州老板电器股份有限公司 | Denoising device, wind turbine and kitchen ventilator |
| CN110118183A (en) * | 2019-05-31 | 2019-08-13 | 上海上涵自动化科技有限公司 | Self-adjusting energy-saving centrifugal pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204226258U (en) * | 2014-08-04 | 2015-03-25 | 威乐(中国)水泵系统有限公司 | Sliding bearing and multistage centrifugal pump |
| CN105317729A (en) * | 2014-08-04 | 2016-02-10 | 威乐(中国)水泵系统有限公司 | Sliding bearing and multi-stage centrifugal pump |
| CN105351206A (en) * | 2015-12-02 | 2016-02-24 | 池泉 | Segmentation type multi-stage centrifugal pump |
| CN105673574A (en) * | 2016-03-18 | 2016-06-15 | 池泉 | Low-noise multi-stage centrifugal pump |
-
2016
- 2016-07-05 CN CN201610522295.8A patent/CN107575392A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204226258U (en) * | 2014-08-04 | 2015-03-25 | 威乐(中国)水泵系统有限公司 | Sliding bearing and multistage centrifugal pump |
| CN105317729A (en) * | 2014-08-04 | 2016-02-10 | 威乐(中国)水泵系统有限公司 | Sliding bearing and multi-stage centrifugal pump |
| CN105351206A (en) * | 2015-12-02 | 2016-02-24 | 池泉 | Segmentation type multi-stage centrifugal pump |
| CN105673574A (en) * | 2016-03-18 | 2016-06-15 | 池泉 | Low-noise multi-stage centrifugal pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108488103A (en) * | 2018-06-26 | 2018-09-04 | 杭州老板电器股份有限公司 | Denoising device, wind turbine and kitchen ventilator |
| CN110118183A (en) * | 2019-05-31 | 2019-08-13 | 上海上涵自动化科技有限公司 | Self-adjusting energy-saving centrifugal pump |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180112 |
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| WW01 | Invention patent application withdrawn after publication |