CN109209880A - A method of preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder - Google Patents
A method of preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder Download PDFInfo
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- CN109209880A CN109209880A CN201811029555.3A CN201811029555A CN109209880A CN 109209880 A CN109209880 A CN 109209880A CN 201811029555 A CN201811029555 A CN 201811029555A CN 109209880 A CN109209880 A CN 109209880A
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- air compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
- F04C19/004—Details concerning the operating liquid, e.g. nature, separation, cooling, cleaning, control of the supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/04—Heating; Cooling; Heat insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Drying Of Gases (AREA)
Abstract
The present invention relates to a kind of methods of corrosion that prevents from condensing in water cooling non-lubricated air compressor cylinder; include the following steps: 1: vacuumizing: the suction inlet of close compressor before air compressor machine is shut down; load operating; final stage blow valve opens emptying; air compressor machine is set to become vacuum pump; damp and hot saturation residual air inside pump drainage, generates negative pressure；2: importing low dew point dry air: at the end of vacuumizing, close all inlet and outlet channels such as final stage blow valve and blowdown valve at different levels, low dew point drying compressed air is imported from the level-one suction chamber of host again, make the air of the dry cleansing inside air compressor machine cylinder at different levels and air flue full of low dew point, and the air pressure in air compressor machine is slightly above ambient atmosphere pressure.Using method of the invention; the characteristic that can make full use of air compressor unit solves the problem of especially to shut down the moisture condensation corrosion of the parts surfaces such as exhaust hood mirror surface, air valve for a long time after large-size water-cooling non-lubricated air compressor is shut down; extend the working life of air compressor machine, reduces maintenance cost.
Description
Technical field
The present invention relates to air compressor fields more particularly to one kind to prevent in water cooling non-lubricated air compressor cylinder
Condense the method corroded.
Background technique
Large-size water-cooling but oil-free air compressor, will be used wider and wider in national economy, especially food,
The fields such as medicine, chemical industry have become indispensable equipment.Compression ring, support ring and the filler of this kind of compressor are all made of solid certainly
Lubriation material, usually enhanced polytetrafluoroethylene (hereinafter referred to as F4) is made.F4 coefficient of friction is lower, has self-lubrication
Energy.F4 forms one layer of transfer membrane under the action of temperature, pressure and friction on cylinder wall in the course of work.This layer of transfer membrane
It is that the F4 material that anchor ring is worn away combines to be formed with cylinder bearing face.Oil-free lubricating piston ring and cylinder work after transfer membrane generates
Make the friction between face, reforms into the friction between oil-free ring surface and transfer membrane.Since F4 coefficient of friction is low, transfer membrane
Presence have good protective effect to cylinder bearing face and without oil ring, reduce the secondary frictional resistance of friction and abrasion.But
It is that transfer membrane is less firm and stable, in the presence of having moisture condensation in cylinder, transfer membrane can fall off, and new transfer membrane generates.In this way
The vicious circle that transfer membrane is formed with fallen off is formd, the abrasion without oil ring are accelerated.Meanwhile the moisture condensation in cylinder can make cylinder work
Make mirror surface corrosion, once corrosion is formed, the work mirror surface of cylinder becomes coarse, and what the material is soft will wear away rapidly mistake without oil ring
Effect, if repairing replacement support ring, piston ring not in time, not only gas production sharply declines, when metal piston body and cylinder operation
Can grind away rapidly cylinder and metal piston body after mirror surface contact, cause the badly damaged of compressor.It is therefore prevented that cylinder operation mirror
Face moisture condensation and corrosion are always the important topic of design and the maintenance, maintenance of this kind of compressor.
The at different levels of this kind of air compressor are designed with water-cooling cooler, and the outlet of every grade of cooler is designed with gas-water separation dress
It sets, condensed moisture is automatically drained out from and through excretion machine, it is ensured that condensed water does not enter next stage compression.For designing good gas
Water separation device, usually can be by most of aqueous water from but a small amount of misty water droplet can still be mixed in air-flow and enter next stage.
Water droplets gasify as the temperature rises in next stage compression process, lighter to the extent of the destruction of transfer membrane, more will not
Lead to liquid hammer.But when the compressor is shut down, the gas being detained in compressor, usually 35-40 DEG C higher than environment temperature, Er Qiehan
Water (steam) amount is saturation state.After compressor shutdown, when inside is cooled to identical as ambient air temperature, saturated air in machine
Body is necessarily precipitated condensed water and is attached on cylinder bearing face, air flue and air valve, destroys transfer membrane, more seriously leads to cylinder
With air valve Damage of Corroded.Here it is, the such air compressor continuously to run without interruption, long working life, intermitten service longevity
Order short reason for it.For this technical problem so far people be all passively adopt remedial measures it is wet to alleviate this burst of saturation
The adverse effect of heat retention gas: cleaning is dismantled in the oil spout into machine from air entry when such as cylinder bearing face chromium plating, shutdown before booting
Etc..The former manufacturing cost is high, and chrome layer is easy to fall off；Latter user maintenance is at high cost, and most users also do not implement this
The technical force of kind maintenance, former capital be not feasible.Therefore, a kind of easy, effective method is found, this strand is eliminated and is detained saturation
Hot and humid gas avoids the moisture condensation such as cylinder valve from corroding, is the urgent need of user.
Summary of the invention
To solve existing technical problem, the present invention provides one kind to prevent in water cooling non-lubricated air compressor cylinder
Condense the method corroded.
Particular content of the invention is as follows: a kind of side preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder
Method includes the following steps:
Step (1): vacuumize: the suction inlet of close compressor before air compressor machine is shut down, load operating, final stage blow valve opening are put
Sky, blowdown valve contract fullies at different levels make air compressor machine become vacuum pump, and damp and hot saturation residual air inside pump drainage generates negative pressure；
Step (2): it imports low dew point dry air: at the end of vacuumizing, closing final stage blow valve and blowdown valve at different levels etc.
All inlet and outlet channels, then the air of the dry cleansing of low dew point is imported from the level-one suction chamber of host, and make in air compressor machine
Air pressure is slightly above ambient atmosphere pressure.In this way, internally dry air can only be leaked outward by various gaps after shutting down, until inside and outside
Pressure balance prevents external moisture from flowing into machine.
The reason of moisture condensation is generated in compressor is compressor when shutting down, and the gas being detained in cylinder, air flue is damp and hot full
And state, the temperature of gas are generally greater than about 35~40 DEG C of environment temperature, as time goes by, in compressor at a temperature of air
Be down to it is identical as environment temperature, in hot and humid gas will necessarily be precipitated condensed water formed condense and be attached to cylinder air flue inner wall
On the components such as surface and air valve, so as to cause the damage to machine inner part.In method used in this application, step (1) first will be empty
Press vacuumizes, and method is the reduction of speed load operating before shutdown, closes air entry and blowdown valve at different levels, opens blow valve, will press
Contracting machine is temporarily transformed into vacuum pump, and the damp and hot saturated gas overwhelming majority after the evacuation is completed in machine in this way is discharged；Step
(2) dry gas is injected into machine again, gradually rises air pressure in machine to slightly above ambient atmosphere pressure, dry gas is in pressure at this time
To exosmosis until machine inside and outside air pressure balance, inside and outside to flow without gas, in this way, the dry gas being enclosed in machine can be grown under effect
Phase retains.And according to the graph of relation (GB/T 4830-2015) of pressure leak source and dew points at normal pressure it is recognised that working as 1.0MPa
Compressed air, when pressure leak source is 10 DEG C, dew points at normal pressure is about -20 DEG C, therefore when the rated output power of the unit is
4.0MPa, as long as purification system of the configuration centered on freeze drier, can be achieved with.As long as the dry gas normal pressure in implanter reveals
Point is sufficiently low (such as -20 DEG C), and the temperature in ordinary circumstance machine room lower obviously can not be lower than -20 DEG C.As long as in this way, after a shutdown
The outside channel of compressor is not opened, is had the protection of dry gas in machine, would not be generated moisture condensation, would not cause in compressor yet
Corrosion, to solve the problems, such as that the moisture condensation after compressor shutdown is corroded.
Further, air compressor machine is become into vacuum pump in step (1), including air compressor machine is improved as follows: in air-breathing noise reduction
The air entry boring cover opened and closed with can be convenient is arranged in the air entry of device；Closed type electricity of the setting equipped with muffler on final stage pipeline
Magnetic blow valve；
It includes being improved as follows air compressor machine that low dew point dry gas is imported in step (2): by level-one cylinder air inlet
Pipeline is connected with compressed air post-processing purifying system export pipeline with pipeline, on connecting line, series connection access two two
Logical normal-closed electromagnetic valve, pressure reducing valve；Installation can measure the pressure sensor of negative pressure on level-one cylinder air intake duct；Vacuumize end
Afterwards, solenoid valve is open-minded, and the dry finished product gas of low dew point is inputted into compressor, pressure reducing valve is adjusted, is lowered into the pressure of level-one cylinder
Power, stopping when pressure sensor detects that negative pressure rises to slightly above environmental pressure in machine；
In cylinder cooling water exits at different levels, temperature sensor is set；On cylinder cooling water outlet conduits at different levels installation with
The electromagnetism water compensating valve that hand-operated valve is in parallel, when temperature sensor measures cylinder return water temperature higher than setting value, corresponding moisturizing
Valve obtains electric-opening and increases water flow, otherwise water compensating valve closes and reduces water flow.
Further, the air entry includes air entry seat, screws the air entry blind nut being assemblied on air entry seat, is clipped in
Steel wire, branch between air entry blind nut and air entry seat are shipped and resell on another market and rotatable air entry boring cover；The air entry seat is pipe
Radial hole related subgroup on shape part, including non-threaded end and threaded end, non-threaded end and air suction silencer staving, there is spiral shell
Line end is stretched out outside air suction silencer staving, and air entry blind nut is hollow round nut, and air entry blind nut, which is assemblied in air entry seat, to be had
On the screw thread of the end of thread, steel wire is compacted when air entry blind nut is tightened；The lower section outer end face and air entry of air entry blind nut are bored
It covers corresponding edge and is equipped with through-hole, branch, which is shipped and resell on another market, connects the two across through-hole, and air entry boring cover can ship and resell on another market rotation around branch；Air-breathing
Mouth blind nut outer circle is equipped with radial screw hole, is equipped with holding screw in screw hole；Air entry boring cover and the symmetric position for propping up hole of shipping and reselling on another market, face
It is embedded in high magnetic steel to blind nut endface, air entry blind nut can be completely covered in upper be screwed on air entry blind nut, closes air entry
And it is fixed by the suction of high magnetic steel；Open air entry, can backspin air entry boring cover, be suspended on branch ship and resell on another market on.
Further, the drying compressed air in step (2) is by the purification system centered on freeze drier
The reason compressed gas dry using the low dew point of decompression, cleaning, dew points at normal pressure are usually less than -20 DEG C, and air pressure is about 0.1
~0.15MPa.
Further, step (1) and step (2) are controlled using control system program, are equipped in the control system of air compressor machine
Control program is shut down, the stop botton on operation panel can activate shutdown control program, press stop botton and then shut down control journey
Sequence starts immediately, and stopping process includes: that automatic execute reduces revolving speed, closes air entry or aspirating unit, opening automatically (or manually)
Final stage blow valve closes blowdown valve at different levels, vacuumizes, opening that water compensating valve cools down, main motor stops operating, imports low dew into machine
Point dry gas, the finally operation such as shutdown.
Further, the shutdown control process control air compressor machine works in accordance with the following steps, has one between each step
Fixed time interval:
Step a: frequency converter reduces frequency, and unit keeps stress state, runs slowly, automatic water compensating valve standard-sized sheets at different levels, row
Dirty valve is gradually sequentially opened from level Four to level-one, excludes condensed water, and final stage blow valve is opened, electromagnetism blowdowns at different levels after a period of time
Valve is automatically closed；
Step b: automatic (or manually) air entry boring cover is closed, unit, which enters, vacuumizes operation, and saturation is damp and hot in exhauster
Residual air；
Step c: unit unloading, i.e., inlet valve standard-sized sheets at different levels, emptying magnetic valve is closed after running the several seconds；
Step d: main motor is shut down, and blow valve remains off, and electromagnetism water compensating valves at different levels keep opening, and continues to cool down,
Water compensating valve at different levels is automatically closed after tens of seconds；
Step e: 2/2-way solenoid valve must establish by cable it is logical, to the suction chamber of level-one cylinder be conveyed through purified treatment, warp
Pressure reducing valve decompression, dry cleansing compressed air, when standby interior pressure rises to slightly above ambient atmosphere pressure, solenoid valve power loss is closed
It closes, stopping process terminates.
Further, air compressor unit must be equipped with the purification system centered on freeze drier, de- with depth
Otherwise water function should be equipped with the air cleaning facility with deep dehydration function, cleaning equipment includes small-sized cooling driers
With spare small volume air accumulator, a small amount of compressed air is drawn from the surge tank of unit, becomes low after the processing of small-sized cooling driers
Dew point compressed air inputs in spare small air accumulator, when the step e of autostop program is performed, in small volume air accumulator
Drying compressed air decompression after flowed into host by 2/2-way solenoid valve from unit level-one suction pipe interface, until machine
Stopping when interior air pressure rises to slightly above ring pressure from negative pressure, dry gas is leaked by each seal clearance outward until interior in machine after shutdown
Outer air pressure balance.As long as hereafter not opening air entry and respectively importing and exporting channel, internal dry gas energy long-term preservation is prevented external
Moisture is invaded, without moisture condensation and corrosion inside protection machine.
Further, air entry can automatic (or manual) open and close；Or in the suction pipe of air suction silencer
Valve is set, it can manually or automatically open and close.According to specific needs, corresponding on-off mode can choose.
Beneficial effects of the present invention: using method of the invention, it is possible to make full use of the characteristic of air compressor unit and be
System composition, is slightly improved, and after solving the shutdown of large-size water-cooling non-lubricated air compressor, especially shuts down exhaust hood mirror for a long time
The problem that the parts surfaces such as face, air valve moisture condensation corrodes, extends the working life of air compressor machine, reduces maintenance cost, has good
Economic results in society.
Detailed description of the invention
A specific embodiment of the invention is furtherd elucidate with reference to the accompanying drawing.
Fig. 1 is the process signal for preventing the method for moisture condensation corrosion in water cooling non-lubricated air compressor cylinder of the invention
Figure；
Fig. 2 is method schematic diagram of the invention；
Fig. 3 is the top view of air suction silencer of the present invention；
Fig. 4 is the state diagram that the air entry in the face A-A of Fig. 3 is closed；
Fig. 5 is the cross-sectional view that the air entry in the face A-A of Fig. 3 is opened；
Fig. 6 is the graph of relation for selecting from the pressure leak source and dew points at normal pressure of GB/T 4830-2015.
Specific embodiment
In conjunction with Fig. 1-Fig. 6, further illustrate that one kind of the invention prevents knot in water cooling non-lubricated air compressor cylinder
The method for revealing corrosion, includes the following steps:
Step (1): vacuumize: the suction inlet of close compressor before air compressor machine is shut down, load operating, final stage blow valve opening are put
Sky, blowdown valve contract fullies at different levels make air compressor machine become vacuum pump, and damp and hot saturation residual air inside pump drainage generates negative pressure；
Step (2): it imports low dew point dry air: at the end of vacuumizing, closing final stage blow valve and blowdown valve at different levels etc.
All inlet and outlet channels, then the air of the dry cleansing of low dew point is imported from the level-one suction chamber of host, and make in air compressor machine
Air pressure is slightly above ambient atmosphere pressure.
The reason of moisture condensation is generated in compressor is compressor when shutting down, and the gas being detained in cylinder, air flue is damp and hot full
And state, the temperature of gas are generally greater than about 35~40 DEG C of environment temperature, as time goes by, in compressor at a temperature of air
Condensed water formation moisture condensation will necessarily be precipitated and be attached to cylinder air flue inner wall by being down to hot and humid gas identical in environment temperature, internal
On the components such as surface and air valve, so as to cause the Damage of Corroded to machine inner part.In method used in this application, step (1) is first
Air compressor machine is vacuumized, method is the reduction of speed load operating before shutdown, closes air entry and blowdown valve at different levels, blow valve is opened,
Compressor is temporarily transformed into vacuum pump, the damp and hot saturated gas overwhelming majority after the evacuation is completed in machine in this way is discharged；
Step (2) injects dry gas into machine again, gradually rises air pressure in machine to slightly above ambient atmosphere pressure, dry gas after shutdown
Under pressure to exosmosis until machine inside and outside air pressure balance, inside and outside to flow without gas, in this way, being enclosed in the dry gas in machine
It can retain for a long time.And according to the graph of relation (GB/T 4830-2015) of pressure leak source and dew points at normal pressure it is recognised that right
In the compressed air of 1.0MPa, when pressure leak source is 10 DEG C, corresponding dew points at normal pressure is about -20 DEG C；It is equipped with suitable cold dry
The purification system of machine can be achieved with.And the temperature in ordinary circumstance machine room lower obviously can not be lower than -20 DEG C, as long as in this way,
The outside channel of compressor is not opened after shutdown, it will be able to guarantee that dry gas is not lost in machine, to prevent entering for external moisture
It invades, would not also lead to the moisture condensation and corrosion in compressor.
As shown in Figure 1, selecting MW-25/40 oil-free lubrication water-cooling air compressor test: compression in the present embodiment
When machine load operating, the air entry of air suction silencer is closed, final stage blow valve is opened, level-one cylinder air-breathing is measured in 2~3 seconds
Intracavitary absolute pressure is 0.025~0.03MPa.This is equivalent to the atmospheric pressure in 9000~11000 meters of high-altitudes, air moisture content
It is atomic, can almost it ignore.
Further, air compressor machine is become into vacuum pump in step (1), including air compressor machine is improved as follows: in air-breathing noise reduction
The air entry boring cover 1 opened and closed with can be convenient is arranged in the air entry of device；Setting is furnished with the closed type of muffler 5 on final stage pipeline
Electromagnetism blow valve 4；
It includes being improved as follows air compressor machine that dry gas is imported in step (2): by level-one cylinder air inlet pipeline and
Compressed air purification system export pipeline is connected with pipeline, on connecting line, series connection access 2/2-way closed type electromagnetism
Valve 2, pressure reducing valve 3；Installation can measure the pressure sensor 14 of negative pressure on level-one cylinder air intake duct；After vacuumizing, electromagnetism
Valve is open-minded, and low dew point finished product gas is inputted into compressor；To avoid gas shock, pressure reducing valve 3 is adjusted, level-one cylinder is lowered into
Pressure, until pressure sensor 14 detects that negative pressure rises to slightly above environmental pressure in machine；
In cylinder cooling water exits at different levels, temperature sensor is set；On cylinder cooling water outlet conduits at different levels installation with
The electromagnetism water compensating valve that hand-operated valve is in parallel, when temperature sensor measures return water temperature higher than setting value, corresponding water compensating valve is obtained
Electric-opening increases water flow, otherwise water compensating valve closes and reduces water flow.
As shown in Figure 1, MW-25/40 type is compressed equipped with the four column level Four of opposed balanced type of post-processing purifying system without grease
Cold air compressor and water cooling system, the present embodiment is from compressor post-processing purifying system exit to level-one cylinder air intake duct
Pipeline is added between road, series connection access 2/2-way normal-closed electromagnetic valve 2 and pressure reducing valve 3 in pipeline, when air compressor machine works normally
Air entry standard-sized sheet, compressor suck air from ambient air, and level-one water cooler is entered after one stage of compression boosts and is cooled down, one
Gas-liquid separation in grade water segregator, the condensed water separated flow into level-one dirt trap (not marking in Fig. 1), regularly automatic row
Out outside machine.Compressed air after dividing water enters secondary cylinder, by same step, enters three-stage cylinder, four after continuing boosting
Grade cylinder.It can reach rated pressure 4.0MPa through the compressed compressed air of level Four, enter back into after the cooling of level Four aftercooler directly
It taps into surge tank.Further enter air accumulator from the outflow of surge tank outlet non-return valve, it is treated the cleaning of purified system, dry
Dry finished product gas input user's uses gas pipe network.
2/2-way solenoid valve 2, pressure reducing valve 3, function is that after the evacuation is completed, solenoid valve is open-minded, into compressor
Low dew point finished product gas is inputted, pressure reducing valve 3 is adjusted, is lowered into the pressure of level-one cylinder, prevents gas shock.Compressor into row
Air valve be all it is unidirectional, only allow an air-flow flow from front to back.Therefore, end is reached rapidly from the finished product gas that level-one air entry inputs
Grade is closed until pressure sensor 14 measures (this example 0.05MPa) solenoid valve 2 when negative pressure in machine rises to slightly above ring pressure.
The workflow of water cooling system is: for water tower output cooling water from water inlet stream below the front ends of cylinders at different levels
Enter cylinder water cavity, is flowed out with being exported above cylinder rear ends at different levels after cylinder inner wall heat exchange.It is exported in cylinder cooling waters at different levels
Place's setting level-one temperature sensor 10, second level temperature sensor 11, three-level temperature sensor 12 and level Four temperature sensor 13,
For controlling the corresponding water compensating valve opening and closing of cylinders at different levels.On water return pipeline with connect access the parallel connection of manual water adjusting valve electromagnetism
Water compensating valve 6,7,8 and 9, when temperature sensor measures return water temperature higher than setting value, corresponding water compensating valve obtains electric-opening increase
Water flow, on the contrary it closes and reduces water flow, delivery temperature is controlled in more satisfactory range, prevents cylinder compression chamber temperature mistake
It is low, prevent the misty liquid droplets contained in the gas of the prime output of sucking from the adverse effect generated to transfer membrane that gasifies rapidly.
Due to the variation of environment temperature, artificially manually adjusting water flow by rule of thumb, to be obviously not so good as automatic control effect good.
Further, as shown in Figure 4 and Figure 5, the air entry includes air entry seat 100, screws and be assemblied in air entry seat
Air entry blind nut 101 on 100, the steel wire 102 being clipped between air entry blind nut 101 and air entry seat 100, branch ship and resell on another market 103
With rotatable air entry boring cover 1；The air entry seat 100 is tubular member, including non-threaded end and threaded end are non-threaded
End and the radial hole related subgroup on air suction silencer staving, threaded end stretch out outside air suction silencer staving, air entry blind nut
101 be hollow round nut, and air entry blind nut 101 is assemblied on the screw thread of 100 threaded end of air entry seat, air entry blind nut
101 steel wires 102 when tightening are compacted；The lower section outer end face and the corresponding edge of air entry boring cover 1 of air entry blind nut 101 are all provided with
There is a through-hole, branch, which is shipped and resell on another market, 103 to be passed through through-hole and connect the two, and air entry boring cover 1 can ship and resell on another market 103 rotations around branch；Air entry blind nut 101
Outer circle is equipped with radial screw hole, is equipped with holding screw 104 in screw hole；Air entry boring cover 1 and branch ship and resell on another market 103 symmetric position, face
It is embedded in high magnetic steel 105 to 101 endface of air entry blind nut, air entry can be completely covered in upper be screwed on air entry blind nut 101
Blind nut 101 is closed air entry and is fixed by the suction of high magnetic steel 105；Open air entry, can backspin air entry boring cover 1, suspension
It ships and resell on another market on 103 in branch.
As shown in Figures 2 and 3, air suction silencer is set there are four air entry in the present embodiment, is radially distributed in staving outer circle
On, air entry is in close state when vacuumizing, and could only be opened before booting next time.
Further, the low dew point compressed air in step (2), is by the purification system centered on freeze drier
It is processed that finished product gas, pressure leak source usually at 10 DEG C or so, about -20 DEG C of corresponding dew points at normal pressure, are decompressed to 0.15MPa
Left and right.
Further, step (1) and step (2) are controlled using control system program, are equipped in the control system of air compressor machine
Control program is shut down, the stop botton on operation panel has and can activate shutdown functions of control program.After pressing stop botton,
Control program is shut down to start immediately.Shut down control program include it is automatic execute reduce revolving speed, automatic or manual closes air entry or
Aspirating unit, open final stage blow valve, close blowdown valve at different levels, vacuumize, opens water compensating valve cools down, main motor stops operating, to
Low dew point dry gas, the finally operation such as shutdown are imported in machine.
Further, the shutdown control process control air compressor machine works in accordance with the following steps, has one between each step
Fixed time interval:
Step a: frequency converter reduces frequency, and unit keeps stress state, runs slowly, automatic water compensating valve standard-sized sheets at different levels, row
Dirty valve is gradually sequentially opened from level Four to level-one, excludes condensed water, and final stage blow valve is opened, electromagnetism blowdowns at different levels after a period of time
Valve is automatically closed；In the present embodiment, the frequency of frequency converter is reduced to 30HZ, and blowing time is 30S or so；
Step b: automatic or manual closes air entry boring cover 1, and unit, which enters, vacuumizes operation, and saturation is damp and hot remaining in exhauster
Gas；The damp and hot residual air time about 30s of saturation in exhauster in the present embodiment；
Step c: unit unloading, inlet valve standard-sized sheets at different levels, emptying magnetic valve is closed after running the several seconds；It is run in the present embodiment
Blow valve is closed after 5s；
Step d: main motor is shut down, and blow valve remains off, and electromagnetism water compensating valves at different levels keep opening, and continues to cool down,
Water compensating valve at different levels is automatically closed after tens of seconds；Temperature fall time is 60s in the present embodiment；
Step e: 2/2-way solenoid valve must establish by cable it is logical, to the suction chamber of level-one cylinder be conveyed through purified treatment, warp
Compressed air that pressure reducing valve 3 reduces to, dry cleansing, when standby interior pressure rises to slightly above ambient atmosphere pressure, solenoid valve power loss
It closes, stopping process terminates.In the present embodiment, finished product compressed air pressure is about 0.15MPa after decompression, when pressure sensor 14
When measuring in machine pressure and being higher than ambient atmosphere pressure 0.05MPa, stopping process terminates.It is lasted about after pressing stop botton from operator
235s。
Further, it if air compressor machine is not equipped with the cleaning equipment with deep dehydration function, must add miniature
Cooling driers and small volume air accumulator, type minitype cool-dry machine are drawn a small amount of compressed air from the surge tank of unit, are become after processing
Drying compressed air inputs in spare small volume air accumulator, when shutdown procedure executes step e through pressure reducing valve and 2/2-way electricity
Magnet valve imports in air compressor.
Further, air entry can manually or automatically open and close, or set in the suction pipe of air suction silencer
Valve is set, it can manually or automatically open and close.According to specific needs, corresponding on-off mode can choose.
Many details are elaborated in the above description to fully understand the present invention.But above description is only
Presently preferred embodiments of the present invention, the invention can be embodied in many other ways as described herein, therefore this
Invention is not limited by specific implementation disclosed above.Any those skilled in the art are not departing from the technology of the present invention simultaneously
In the case of aspects, all technical solution of the present invention is made using the methods and technical content of the disclosure above many possible
Changes and modifications or equivalent example modified to equivalent change.Anything that does not depart from the technical scheme of the invention, according to this
The technical spirit of invention any simple modifications, equivalents, and modifications made to the above embodiment, still fall within skill of the present invention
In the range of the protection of art scheme.
Claims (8)
1. a kind of method for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, it is characterised in that: including as follows
Step:
Step (1): vacuumize: the suction inlet of close compressor before air compressor machine is shut down, load operating, final stage blow valve open emptying,
Blowdown valve contract fullies at different levels, make air compressor machine become vacuum pump, and damp and hot saturation residual air inside pump drainage generates negative pressure；
Step (2): it imports low dew point dry air: at the end of vacuumizing, it is all to close final stage blow valve and blowdown valve at different levels etc.
Channel is imported and exported, then imports from the level-one suction chamber of host the compressed air of the dry cleansing of low dew point, and make in air compressor machine
Air pressure is slightly above ambient atmosphere pressure.
2. the method according to claim 1 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: air compressor machine being become vacuum pump in step (1), including being improved as follows air compressor machine: in the air entry of air suction silencer
The air entry boring cover opened and closed with can be convenient is set；Setting is furnished with the closed type electromagnetism blow valve of muffler on final stage pipeline；
It includes being improved as follows air compressor machine that low dew point dry gas is imported in step (2): by level-one cylinder air inlet pipeline
It is connected with compressed air post-processing purifying system export pipeline with pipeline, on connecting line, series connection access 2/2-way is normal
Closed form solenoid valve, pressure reducing valve；Installation can measure the pressure sensor of negative pressure on level-one cylinder air intake duct；After vacuumizing,
Solenoid valve is open-minded, and the dry finished product gas of low dew point is inputted into compressor, pressure reducing valve is adjusted, is lowered into the pressure of level-one cylinder,
Until pressure sensor detects that negative pressure rises to slightly above environmental pressure in machine；
In cylinder cooling water exits at different levels, temperature sensor is set；It is installed on cylinder cooling water outlet conduits at different levels and manual
The electromagnetism water compensating valve that valve is in parallel, when temperature sensor measures cylinder return water temperature higher than setting value, corresponding water compensating valve is obtained
Electric-opening increases water flow, otherwise water compensating valve closes and reduces water flow.
3. the method according to claim 2 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: the air entry includes air entry seat, screws the air entry blind nut being assemblied on air entry seat, is clipped in air entry blind nut
Steel wire, branch between air entry seat are shipped and resell on another market and rotatable air entry boring cover；The air entry seat is tubular member, including
Radial hole related subgroup on non-threaded end and threaded end, non-threaded end and air suction silencer staving, threaded end overhang
Outside air suction silencer staving, air entry blind nut is hollow round nut, and air entry blind nut is assemblied in air entry seat threaded end
On screw thread, steel wire is compacted when air entry blind nut is tightened；The lower section outer end face and air entry boring cover of air entry blind nut are corresponding
Edge is equipped with through-hole, and branch, which is shipped and resell on another market, connects the two across through-hole, and air entry boring cover can ship and resell on another market rotation around branch；Outside air entry blind nut
Circle is equipped with radial screw hole, is equipped with holding screw in screw hole；Air entry boring cover and the symmetric position for propping up hole of shipping and reselling on another market, towards blind nut end
It is embedded in high magnetic steel at face, air entry blind nut can be completely covered in upper be screwed on air entry blind nut, closes air entry and by strong
The suction of magnet steel is fixed；Open air entry, can backspin air entry boring cover, be suspended on branch ship and resell on another market on.
4. the method according to claim 1 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: the compressed air in step (2) be by treated the finished product gas of the purification system centered on freeze drier, then
The dry compressed gas of low dew point by reduced pressure treatment, cleaning, dew points at normal pressure are usually less than -20 DEG C, and air pressure is about 0.1~
0.15MPa。
5. the method according to claim 1 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: step (1) and step (2) are controlled using control system program, are equipped in the control system of air compressor machine and are shut down control journey
Sequence, the stop botton on operation panel can activate shutdown control program, shut down control program include: it is automatic execute reduce revolving speed,
Automatically air entry or aspirating unit are closed (or manually), are opened final stage blow valve, closing blowdown valve at different levels, are vacuumized, open moisturizing
Valve cooling, main motor stop operating, import low dew point dry gas, the finally operation such as shutdown into machine.
6. the method according to claim 5 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: the shutdown control process control air compressor machine works in accordance with the following steps, between the regular hour between each step
Every:
Step a: frequency converter reduces frequency, and unit keeps stress state, runs slowly, automatic water compensating valve standard-sized sheet coolings at different levels, row
Dirty valve is gradually sequentially opened from level Four to level-one, excludes condensed water, and final stage blow valve is opened, electromagnetism blowdowns at different levels after a period of time
Valve is automatically closed；
Step b: automatic (or manually) air entry boring cover is closed, unit, which enters, vacuumizes operation, the damp and hot residual air of saturation in exhauster；
Step c: unit unloading, inlet valve standard-sized sheets at different levels, emptying magnetic valve is closed after running the several seconds；
Step d: main motor is shut down, and blow valve remains off, and electromagnetism water compensating valves at different levels keep opening, and continue to cool down, tens of
Water compensating valve at different levels is automatically closed after second；
Step e: 2/2-way solenoid valve must establish by cable it is logical, to the suction chamber of level-one cylinder be conveyed through purified treatment, through depressurizing
Valve decompression, dry cleansing compressed air, when standby interior pressure rises to slightly above ambient atmosphere pressure, solenoid valve power loss is closed,
Stopping process terminates.
7. the method according to claim 6 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: when air compressor machine is not equipped with the purification system centered on freeze drier, should add has the function of deep dehydration
Air cleaning facility, such as small-sized cooling driers and spare small volume air accumulator draw a small amount of compression from the surge tank of unit
Air becomes low dew point compressed air after type minitype cool-dry machine is handled, and inputs in spare small air accumulator, when autostop program
Step e is performed, by 2/2-way solenoid valve from unit level-one after the decompression of drying compressed air in small volume air accumulator
Suction pipe interface flows into host.
8. the method according to claim 1 for preventing moisture condensation corrosion in water cooling non-lubricated air compressor cylinder, special
Sign is: air entry can be opened manually or automatically；Or air suction silencer suction pipe be arranged valve, can manually or
Person automatically turns on and closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811029555.3A CN109209880B (en) | 2018-09-05 | 2018-09-05 | Method for preventing dewing and rusting in water-cooling oil-free lubrication air compressor cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811029555.3A CN109209880B (en) | 2018-09-05 | 2018-09-05 | Method for preventing dewing and rusting in water-cooling oil-free lubrication air compressor cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN109209880A true CN109209880A (en) | 2019-01-15 |
| CN109209880B CN109209880B (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811029555.3A Active CN109209880B (en) | 2018-09-05 | 2018-09-05 | Method for preventing dewing and rusting in water-cooling oil-free lubrication air compressor cylinder |
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| CN (1) | CN109209880B (en) |
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| CN112879355A (en) * | 2020-12-31 | 2021-06-01 | 漳州旗滨玻璃有限公司 | Maintenance method of centrifugal machine for producing compressed air for glass |
| CN113202766A (en) * | 2021-05-21 | 2021-08-03 | 苏州寿力气体设备有限公司 | Clean dry air system of oil-free screw compressor |
| CN114738274A (en) * | 2022-03-21 | 2022-07-12 | 陕西飞机工业有限责任公司 | G250 screw air compressor oil gas system |
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| CN1789724A (en) * | 2004-12-17 | 2006-06-21 | 上海华虹Nec电子有限公司 | Apparatus for preventing interior tarnishing of air compressor |
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| CN112879355A (en) * | 2020-12-31 | 2021-06-01 | 漳州旗滨玻璃有限公司 | Maintenance method of centrifugal machine for producing compressed air for glass |
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| CN114738274A (en) * | 2022-03-21 | 2022-07-12 | 陕西飞机工业有限责任公司 | G250 screw air compressor oil gas system |
| CN114738274B (en) * | 2022-03-21 | 2023-05-23 | 陕西飞机工业有限责任公司 | Oil-gas system of G250 screw air compressor |
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|---|---|
| CN109209880B (en) | 2021-01-15 |
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