CN206054413U - Variable frequency hydraulic variable loading system - Google Patents
Variable frequency hydraulic variable loading system Download PDFInfo
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- CN206054413U CN206054413U CN201620915597.7U CN201620915597U CN206054413U CN 206054413 U CN206054413 U CN 206054413U CN 201620915597 U CN201620915597 U CN 201620915597U CN 206054413 U CN206054413 U CN 206054413U
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Abstract
This utility model is related to a kind of variable frequency hydraulic variable loading system, including hydraulic system, remove the ratio spill valve in hydraulic system, manually-operated gate in system is fixed to into a certain aperture, solidification oil pipe line, system Oil pump electrical machinery rotating speed adopt the change of VFC, Oil pump electrical machinery actual speed to cause exerting oneself for gear oil pump to change, it is final to change oil system oil pressure, so as to reach the purpose that system oil pressure follows the change of feeder coal-supplying amount and changes.Import solenoid-operated proportional spill valve is cancelled by this utility model, and constant speed oil pump is changed to variable-speed operation, changes oily flow in hydraulic oil system by changing pump speed, so as to change hydraulic system pressure value, reduces requirement of the system to oil；Change the workload of original system frequent clean spill valve and oil strain；Oil pump day-to-day operation power consumption is reduced simultaneously, petrol station oil temperature is reduced, oil pump life is improved, and is reduced petrol station fault rate and is reduced regular maintenance expense.This utility model transforms simple and convenient, low cost, good energy-conserving effect.
Description
Technical field
This utility model is related to oil pump hydraulic system field, more particularly to a kind of variable frequency hydraulic of medium-speed pulverizer becomes loading
System.
Background technology
Existing constant speed oil pump hydraulic system passes through overflow valve or electromagnetic proportion relief valve changes hydraulic system oil pressure, so as to change
Become medium-speed coal mill roller on-load pressure.Due to having used Italy or Germany to produce overflow valve, precision requirement compares the system
Height, more sensitive to particulate matter in hydraulic pressure oil, the requirement to oil is higher, needs frequent oil strain, solenoid-operated proportional spill valve to need
Want frequent clean；Moreover oil pump is constant speed operation, system power consumption is than larger, and fuel tank oil temperature is high affects oil pump critical seal material
The life-span of material, oil pump change frequent, and petrol station fault rate is higher.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of variable frequency hydraulic variable loading system of medium-speed pulverizer,
Requirement of the reduction system to oil, changes the workload of original system frequent clean spill valve and oil strain；It is daily that oil pump is reduced simultaneously
Operation power consumption, reduces petrol station oil temperature, improves oil pump life, reduces petrol station fault rate and reduces regular maintenance expense.
The technical scheme that this utility model solves above-mentioned technical problem is as follows：A kind of variable frequency hydraulic variable loading system, including
It is fixed to become loading switching solenoid directional control valve, proportional pressure control valve, overflow valve, hydraulicchange-over valve drive magnetic valve, hydraulicchange-over valve, lifting
Grinding roller electromagnetic valve, grinding roller synchronization lifting regulating valve, oil cylinder, fuel tank, manually-operated gate etc., remove the ratio oil spilling in hydraulic system
Manually-operated gate in system is fixed to a certain aperture by valve, solidifies oil pipe line, and system Oil pump electrical machinery rotating speed adopts VFC, oil
The change of pump motor actual speed causes exerting oneself for gear oil pump to change, final to change oil system oil pressure, so as to reach is
System oil pressure follows the purpose of the change of feeder coal-supplying amount and change.
Based on above-mentioned technical proposal, the beneficial effects of the utility model are to cancel import solenoid-operated proportional spill valve, will be fixed
Fast oil pump is changed to variable-speed operation, changes oily flow in hydraulic oil system by changing pump speed, by supply side supply oil
Amount changes hydraulic system pressure value to adjust, and reduces requirement of the system to oil；Change original system frequent clean spill valve and filter
The workload of oil；Oil pump day-to-day operation power consumption is reduced simultaneously, petrol station oil temperature is reduced, oil pump life is improved, and reduces petrol station failure
Rate and reduction regular maintenance expense.This utility model transforms simple and convenient, low cost, good energy-conserving effect.
Description of the drawings
Fig. 1 is the hydraulic scheme before coal pulverizer transformation；
Fig. 2 is the improved hydraulic scheme of coal pulverizer；
Fig. 3 is the graph of a relation of feeder coal-supplying amount and system oil pressure；
Fig. 4 is the graph of a relation of pump speed and system oil pressure；
Fig. 5 is the graph of a relation of feeder coal-supplying amount and pump speed.
Labelling in figure：1. fixed change loads switching solenoid directional control valve, 2. proportional pressure control valve, 3. overflow valve, 4. hydraulicchange-over valve
Drive magnetic valve, 5. hydraulicchange-over valve, 6. lifts grinding roller electromagnetic valve, 7. grinding roller synchronization lifting regulating valve, 8. oil cylinder, 9. fuel tank,
10. manually-operated gate, 11. tubular type flow control valves.
Specific embodiment
Principle of the present utility model and feature are described below in conjunction with accompanying drawing, example is served only for explaining this practicality
It is new, it is not intended to limit scope of the present utility model.
Chinese 200MW and above coal unit are substantially using the medium-speed pulverizer of hydraulic loaded technology；The coal pulverizer
Advantage is that performance driving economy is good；Unit power consumption of coal pulverizing is low.It is hydraulic control which is mainly characterized by Roller of Coal Grinder on-load pressure；The system
From Germany's introduction, system oil pressure is changed so as to change hydraulic cylinder accelerator rod pressure by the change of the dredge oil amount of oil system ratio spill valve
Power.Original design according to Germany, hydraulic system oil pressure should belong to straight line proportion function relation with the coal-supplying amount of corresponding feeder, both
Ensure that the grinding of coal pulverizer is exerted oneself, in turn ensure that abrasive power is normal, unit power consumption of coal pulverizing is normal.The system was introduced from the nineties in last century
China；Unit power consumption of coal pulverizing is reduced to Coal-fired Power Plants In China and plays huge effect.
As coal pulverizer installation site is near zero meter of coal pulverizer of boiler Factory Building, in environment, dust content is too high, adds oil
Case inner oil tube road is to suppress high pressure rubber pipeline, the aging generation granule of capacity；And original design change loads oil system ratio oil spilling
Valve is produced for Italy, and the requirement to the middle particulate matter of oil is very high, once particle content is exceeded, ratio spill valve will block
Puckery, system oil pressure can not be adjusted.During most serious, after more renewing ratio spill valve one week, cannot normal regulating.System is pressed for a long time
Determine load mode operation；Unit power consumption of coal pulverizing increases a lot.For coal pulverizer economical operation, when operation or maintainer 24 whenever and wherever possible
Oil system manually-operated gate de-regulation oil pressure is adjusted manually, particularly during unit starting, in the case of coal amount very little, loading oil
Pressure is high uneconomical, and coal-grinding machine vibration is big, is frequently adjusted manually, has influence on unit operation safety.Maintenance cost is higher：
Oil system ratio spill valve buys certified products from Italy needs 1.8 ten thousand yuan or so, and wants frequent oil strain.
Variable frequency hydraulic concept had frequency conversion from 1992 from the beginning of the Japanese frequency-changing hydraulic elevator of manufacture for the first time in the world
The concept of hydraulic pressure, in current world wide, substantial amounts of variable frequency hydraulic patent is produced.Of short duration time transition before variable frequency hydraulic is produced
Product are that hydraulic system matches somebody with somebody variable pump, but performance driving economy can not show a candle to variable frequency hydraulic.
The hydraulic scheme of existing coal pulverizer adopts the system that builds the pressure as shown in figure 1, hydraulic system is substantially, and is normally transporting
When needing switching to become loading during row, the change loading switching solenoid directional control valve 1 of determining of two four-ways switches to left lateral position, will load surely
Change stress state is switched to, now oil pressure is adjusted by proportional pressure control valve 2, when needing pressure high, then 2 overflow oil mass of proportional pressure control valve
It is many.When determining load operating, the change loading switching solenoid directional control valve 1 of determining of two four-ways operates in right lateral position, and oil pressure adds by fixed
Carry overflow valve 3 to adjust, if oil pressure is higher than setting valve, 3 draining of overflow valve, if oil pressure is less than setting valve, overflow valve 3 cuts out and suppresses oil.
When rising grinding roller, hydraulicchange-over valve drive magnetic valve 4 switches to left lateral position, and hydraulicchange-over valve 5 is driven by pressure oil and cut
Left lateral position is shifted to, lower cylinder oil return is closed.Lifting grinding roller electromagnetic valve 6 switches to right lateral position, and pressure oil is through three groups of grinding roller synchronizations
To 8 times cylinder oilings of oil cylinder after lift adjustment valve 7, grinding roller rises.
During drop grinding roller, lifting grinding roller electromagnetic valve 6 switches to left lateral position, and lower cylinder oil is through three groups of grinding roller synchronization lifting regulating valves
7th, grinding roller electromagnetic valve 6, oil return oil cooler, oil return filter screen are lifted, fuel tank 9 is back to, after grinding roller drops to position, hydraulicchange-over valve drives electricity
Magnet valve 4 switches to right lateral position, and hydraulicchange-over valve 5 is playbacked under spring force, and the oil return of lower cylinder is turned on to fuel tank 9.During drop grinding roller,
Hydraulicchange-over valve 5 can not be opened, and otherwise grinding roller will be pounded to mill, equally, when rising grinding roller, hydraulicchange-over valve 5 with speed quickly
Can not close, otherwise grinding roller can not rise.
For the problem that existing system is present, the performance driving economy of this utility model collateral security medium-speed pulverizer sets out, and protects
The transmutability of card system oil pressure, in the case where oil can not ensure, removes the ratio spill valve 2 in hydraulic system, while can
Remove overflow valve 3 and fixed change loads switching solenoid directional control valve 1, and tubular type flow control valve 11 is set on oil pipe line, such as Fig. 2 institutes
Show, manually-operated gate in system 10 be fixed to into a certain aperture, solidify oil pipe line, system Oil pump electrical machinery rotating speed adopts VFC,
Change system oil pump actual speed, it is so as to change exerting oneself for gear oil pump, final to change oil system oil pressure, to reach system oil pressure
Follow the purpose of the change of feeder coal-supplying amount and change.In order to realize changing the purpose of pump speed, can power in Oil pump electrical machinery
Attached with frequency converters on loop.
Automatically controlling for original design DCS (Distributed Control System) becomes loading principle into feeder coal-supplying amount is added with coal pulverizer
The system oil pressure of load is proportion function relation, carries out Closed loop control of Injection Pressure control, as shown in Figure 3.
After Hydraulic System Oil pump motor is changed to VFC, keep oil system pipeline constant, change pump speed, record is not
With rotary speed system oil pressure, record data is as follows：
According to above table, pump speed is proportion function relation with the relation of system oil pressure, forms Fig. 4.
By association Fig. 3 related to Fig. 4, Fig. 5 is formed.Final medium-speed pulverizer become Loading Control become feeder coal-supplying amount with
The functional relationship of pump speed, control system are pump speed closed loop control.Regulation performance is higher than Closed loop control of Injection Pressure precision.Oil pressure
, compared with spill valve, governing speed is slow, but requirement of the variable loading system to response speed is more than anti-for hydraulic system frequency conversion rate of change
Answer the requirement of precision low；So variable frequency hydraulic meets the needs that medium-speed pulverizer becomes loading.Further, since cancelling ratio in oil system
Example spill valve reduces maintenance cost, and requirement of the system to particulate matter in oil substantially reduce, it is to avoid frequent oil strain and reduction
Fault rate, so as to ensure that medium-speed pulverizer runs.
Jing actual tests show that separate unit oil pump average current will reduce 5A, annual to calculate by 8000 hours run times
Economize on electricity 1.44 ten thousand KWH, changes the average 6KV of system loads oil pressure according to pulverizer capacity and coal varitation after medium-speed pulverizer operation
Motor reduces running current 1.5A 100,000 KWH of economize on electricity；After system operation, petrol station oil temperature reduces about 10 DEG C in addition, improves oil pump
Life-span.
Also can be by system oil pump be changed to variable capacity oil pump realization, but energy-saving effect is not so good as this programme substantially, and cost ratio
This programme is high.
Preferred embodiment of the present utility model is the foregoing is only, it is not to limit this utility model, all in this practicality
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (4)
1. a kind of variable frequency hydraulic variable loading system, including fixed change loads switching solenoid directional control valve, proportional pressure control valve, overflow valve, liquid
Move to electrohydraulic valve actuator magnet valve, hydraulicchange-over valve, lifting grinding roller electromagnetic valve, grinding roller synchronization lifting regulating valve, oil cylinder, fuel tank, handss
Movable valve, it is characterised in that：Remove the ratio spill valve in hydraulic system, manually-operated gate in system be fixed to into a certain aperture,
Solidification oil pipe line, system Oil pump electrical machinery rotating speed adopt the change of VFC, Oil pump electrical machinery actual speed to cause gear oil pump
Exert oneself and change, it is final to change oil system oil pressure.
2. variable frequency hydraulic variable loading system according to claim 1, it is characterised in that remove the fixed loading switching electromagnetism that becomes and change
To valve and overflow valve, and tubular type flow control valve is set on oil pipe line.
3. variable frequency hydraulic variable loading system according to claim 1, it is characterised in that install additional on Oil pump electrical machinery current supply circuit
Have for changing the converter of pump speed.
4. according to the arbitrary described variable frequency hydraulic variable loading system of claims 1 to 3, it is characterised in that control system is oil pump
Speed closed loop control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620915597.7U CN206054413U (en) | 2016-08-22 | 2016-08-22 | Variable frequency hydraulic variable loading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620915597.7U CN206054413U (en) | 2016-08-22 | 2016-08-22 | Variable frequency hydraulic variable loading system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206054413U true CN206054413U (en) | 2017-03-29 |
Family
ID=58384756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620915597.7U Expired - Fee Related CN206054413U (en) | 2016-08-22 | 2016-08-22 | Variable frequency hydraulic variable loading system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206054413U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246622A (en) * | 2016-08-22 | 2016-12-21 | 王恩峰 | Variable frequency hydraulic variable loading system |
| CN111339666A (en) * | 2020-02-28 | 2020-06-26 | 中国电建集团长春发电设备有限公司 | Medium-speed coal mill output calculation method of hydraulic variable-loading damping vibration attenuation control system |
-
2016
- 2016-08-22 CN CN201620915597.7U patent/CN206054413U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246622A (en) * | 2016-08-22 | 2016-12-21 | 王恩峰 | Variable frequency hydraulic variable loading system |
| CN111339666A (en) * | 2020-02-28 | 2020-06-26 | 中国电建集团长春发电设备有限公司 | Medium-speed coal mill output calculation method of hydraulic variable-loading damping vibration attenuation control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170324 Address after: 100192 Beijing, Haidian District after the South Road, No. 4, layer 26, 5-66 Patentee after: Wang Enfeng Patentee after: Geng Hongqi Address before: 100192 room 5-66, room, No. 26, South Tuen Mun Road, Beijing, Haidian District Patentee before: Wang Enfeng |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170329 Termination date: 20190822 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |