CN1254610C - Box type complete screw compressor - Google Patents

Abstract

The present invention relates to a dry type screw compressor which comprises a convex rotor, a concave rotor and a casing, wherein the convex rotor is provided with screw-shaped convex teeth; the concave rotor is provided with screw-shaped concave teeth; the convex rotor and the concave rotor are supported in the casing through bearings installed in the casing and are connected with each other by a synchronous gear, the convex rotor and the concave rotor rotate in a noncontact mode, the teeth of the convex rotor closely mesh with those of the concave rotor, and a layer of tetrafluoroethylene-perfluoroalkyl ethyl vinyl ether copolymer is coated on the convex rotor and the concave rotor. The dry type screw compressor of the present invention can prevent the small gap between the rotors or the small gap between each rotor and the casing from being blocked owing to rust and can prevent rotors from braking.

Description

Box type complete screw compressor

The application is dividing an application of application number is 94101413.4, denomination of invention is on February 19th, 1994 patent application for " box type complete screw compressor ", the applying date.

Technical field

The present invention relates to a kind of box type complete screw compressor, it is equipped with compressor body, motor and supplementary equipment, and these parts are contained in its casing, and the compressor of the above-mentioned type for example is used to the oil-free air source of general industry equipment.In addition, the invention still further relates to screw rotor coating into the dry type helical-lobe compressor.The gas that is compressed by compressor can be air or the gas that is different from air.

Background technique

The dry type design of twin screw compressor is that male rotor is meshed in the non-contact mode with female rotor, keeps a little gap, pressurized air in the compression chamber in compressor case by synchromesh gear.Therefore, this dry type helical-lobe compressor does not have oil between two rotors and between rotor and the shell little gap being arranged in its compression chamber.If when compressor is not worked, because water in air vapour condenses and gets rusty at rotor surface, the flank of tooth of convex and female rotor is blocked mutually, or make between rotor and the compression chamber wall and block mutually by rust staining.Consequently produce the phenomenon that rotor gets clogged, rotor can't be rotated.

So far, as a kind of method of improving the rotor surface antiseptic property, constitute coating by add solid lubricant securely at rotor surface, for example molybdenum disulfide (hereinafter is called " MoS ₂") or particulate powder (hereinafter being called " PTFE ") such as tetrafluoroethylene etc.

For example, can make MoS by process shown in Figure 19 so far ₂Film.That is, earlier screw rotor is processed as the shape with preliminary dimension, then, operation 118 makes rotor flank of tooth cleaning and oil removing, and operation 120 is handled (dipping) for manganese phosphate.Be screw rotor drying process 122 then, with MoS ₂For the coating operation 124 of the coating of main component, then carry out roasting procedure 126 and 127.If necessary, repeat operation shown in Figure 19 124 to 128,, improve the anti-corrosion capacity of rotor to obtain desired thickness.Consequently, rotor is owing to the situation that corrosion takes place to stop up is avoided.

Yet, owing to be used in MoS ₂The heat resistance of the heat resistance of the Bond in the coating-manganese phosphate film is about 200 ℃, so when the compressor long-term work when compressor exhaust temperature surpasses 200 ℃, reduced anti-corrosion capacity, and thereby owing to moisture is arranged and rotor is got rusty in the air, thereby rotor is braked.

Therefore, must take the counter measure, for example add an operation system, it comprises " not working a for a long time " switch that is contained on the compressor control plate, and be designed to that equipment enters work when connecting this switch, close suction valve under zero load, about 20 minutes of screw compressor is removed moisture in the compression chamber by evaporation, then quits work automatically.

A kind of MoS that is bonded together with epoxy adhesive that has has also been proposed ₂The rotor of grain coating (Japan Patent Laid-Open (Unexamined Publication) No.2-201072).

As this class process engineering that will film on the rotor basal plane, a kind of rotor is disclosed, the matrix of this rotor is a synthetic resin, and the top layer is an ethylene-tetrafluoroethylene copolymer, strengthens (seeing Japan Patent Laid-Open No.2-75789 and No.1-301977) with carbon fiber directly or indirectly.In addition, disclose a kind of rotor, it forms (seeing Japan Patent Laid-Open No.2-301694) by the matrix of rotor, corrosion-resistant coating and solid lubricant top layer on the matrix.Another kind of rotor also is provided, and it is formed (seeing Japan Patent Laid-Open No.3-290086) by spheroidal graphite cast iron, chemical Ni-plating layer, polyphenylene sulfide resin layer and organic resin such as epoxy resin surface layer.In addition, proposed a kind of rotor, it is based on aluminum alloy or magnesium alloy etc., and is added with thermoset resin layer (Japan Patent Laid-Open No.3-271586) on this basis.

For example, Japan Patent Laid-Open No.61-190184 has proposed the coating thickness on the screw rotor matrix.

Summary of the invention

An object of the present invention is, prevent that the air of discharging from flowing in the passage that the motor cooling air flows through when compressor no-load running.

Another object of the present invention is to prevent to get rusty on screw rotor, and thereby avoids owing to getting rusty rotor being braked in the gas compression chamber.

In order to achieve the above object, the present invention regulation is coated undercoat on each has been machined into the lobe of the screw rotor with predetermined profile of tooth, then carry out drying and baking.Then, deposit equably or apply by the coating that tetrafluoroethylene-perfluoroalkyl vinyl ethyl ether copolymer (hereinafter being referred to as " PFA ") is formed, then, carry out drying and baking, film or coating so that form PFA, thereby avoided rotor to get rusty on the rotor lobe surface.

Preferably forming PFA by following operation films: will be coated on the rotor matrix surface by the prepared paint solution of PFA particle, Bond, pigment and water mixing and diffusion, then carry out drying and baking; Apply PFA particle, Bond and pigment and be diffused in the PFA coating solution of making in the water, then carry out dry and be baked to one making the temperature of PFA particles fuse on rotor matrix, to form continuous filming.

If add the PFA coating, make rotor matrix cover the layer of even film, the PFA particle that has melted in the film has constituted continuous layer, then can not constitute pore easily.Therefore, even the thickness of PFA film little (50 microns or thinner) also can be obtained tangible rust-proof effect.Owing to formed uniform integral layer after the PFA particle of fusion solidifies, be coated with rete so needn't worry to destroy owing to fall particulate powder.

Because PFA has non-adhesive characteristic, so, invade between male rotor and the female rotor or the impurity in the little gap between rotor and the shell, as dust in air, can easily be discharged from.Therefore, owing to gathering impurity the problem of rotor obstruction is avoided.

As mentioned above, be added in the PFA coating on the dry type rotor of helical lobe compressor, can make getting rusty of rotor reduce to minimum degree.Therefore, can avoid getting rusty and blocking in the little gap internal cause between the rotor or between rotor and the shell.Consequently, can avoid rotor being braked because of getting rusty.

By following narration can fully understand the present invention other and further purpose, feature and advantage.

Description of drawings

Fig. 1 represents the perspective view by the box type complete screw compressor inner member arrangement of the embodiment of the invention;

Fig. 2 A represents the plane view that compressor inner member shown in Figure 1 is arranged;

The rear view of structure shown in Fig. 2 B Fig. 2 A;

Fig. 3 represents the Block Diagram of compressor part work relationship shown in Figure 1;

Fig. 4 represents the front elevation of compressor box outward appearance shown in Figure 1;

Fig. 4 A represents the note view with the structure of castor support air cooler;

Fig. 4 B represents to be fixed on the note view that the removable central frame structure on the external frame is given an example;

Fig. 5 represents the plane view of the door-plate opening/closing situation of compressor shown in Figure 1;

Fig. 6 represents will carry out in the compressor shown in Figure 1 the plane view of the part of current check;

Fig. 7 represents the side view of compressor air cooler tube bank removing direction shown in Figure 1;

Fig. 8 represents that the interstage cooler of compressor shown in Figure 1 extracts the side view of approach slidably out;

Fig. 9 represents the plane view of the situation that the air-cooler end cap of compressor shown in Figure 1 is opened/closes;

Figure 10 represents the situation that compressor maintenance shown in Figure 1 assembles with crane;

Figure 11 represents that compressor inleting pipe shown in Figure 1 takes out the perspective view of approach;

The end elevation that dissects that Figure 12 A and 12B are respectively compressor exhaust pipe shown in Figure 1 and motor exhausting pipe composite structure disconnects rear view with the part;

Figure 13 represents the note figure of various pressure reference levels;

Figure 13 A to 13D adjusts compressor throughput, and the process flow diagram of self-drive stress level when setting and being controlled at pipeline pressure and reducing;

Figure 14 represents to be contained in the switch on the control panel and the note view of display device, and control panel is used to carry out the control shown in Figure 13 A to 13D;

Figure 15 is illustrated in the perspective view that the inner member in traditional box type complete screw compressor is arranged;

Figure 16 represents the perspective view of engagement situation between helical-lobe compressor male rotor and the female rotor;

Figure 17 represents the enlarged view by the coating of the embodiment of the invention, represents the substantial section that concerns between screw rotor matrix and the coating with the mode in amplification and cross section;

Figure 18 carries out the technological process of PFA coating by the embodiment of the invention;

Figure 19 carries out traditional MoS ₂The technological process of coating;

Be added with on Figure 20 screw rotor lobe the PFA coating helical-lobe compressor obtained prevents the effect that rotor blocks because of getting rusty, and be added with MoS on the screw rotor lobe ₂The plotted curve that the effect that helical-lobe compressor obtained of coating compares is being simulated choking phenomenon in order to assess in the test of blocking and carrying out;

Figure 21 represents to form the process that PFA is coated with rete;

Figure 22 represents to form the process that traditional PTFE is coated with rete; And

Figure 23 represents to form traditional MoS ₂Be coated with the process of rete.

Embodiment

Do summary description referring to Fig. 1,2A, 2B and 3 pairs of box type complete screw compressors by most preferred embodiment of the present invention.

Accelerator 3 is contained on the compressor complete sets of equipment base 21, and plug-in mounting vibration isolation rubber 3a is fixed on the accelerator 3 to low pressure stage compressor (body) 1 and high pressure stage compressor (body) 2 cantilever types between the two.Main motor 4 is face-type motors, and it is fixed on the accelerator 3 by the flange part of its housing.Above several parts 1-4 be configured to make their the line A of rotating shaft center consistent with vertical X of base 21.In the lower space of low pressure stage compressor 1 and high pressure stage compressor 2, be provided with interstage cooler 5 (compressor (body) interstage cooler of more specifically saying so), the low-pressure compressed air that its cooling is discharged from low pressure stage compressor 1, and play the connecting tube that couples together between two compressors 1 and 2.Holder part at interstage cooler 5 has the castor 25 that can roll on track 26, track 26 is contained on the base 21, and therefore, interstage cooler 5 can take out by sliding when doing the maintenance maintenance work or move along the Y direction.Interstage cooler 5 is fixed on the base 21 by support 27 and vibration isolation rubber 27a usually, and they make castor 25 and track 26 be in discontiguous state (state shown in the solid line among Fig. 4 A).If unclamp nut 27b, interstage cooler 5 can move down, and support 27 is the position shown in the dotted line in moving down into Fig. 4 A also, thereby castor 25 can be placed on the track 26.The aftercooler 6 (compressor (body) aftercooler of more specifically saying so) that the high pressure air that cooling high pressure stage compressor 2 is discharged is used is fixed on the top of accelerator 3 by vibration isolation rubber.As the back also will be narrated by means of Fig. 9, interstage cooler 5 and aftercooler 6 all were shell-and-tube coolers, and they are designed to be contained in the integrated Pipe bundle structure 35c in the shell 35, and Pipe bundle structure 35c is made up of dividing plate 35a and cooling tube 35b.Therefore the tube sheet (end plate) 33 that is contained in a side is the plates that can move within the specific limits, has formed a kind of structure that 35c is drawn out of when doing cleaning or move along the Y direction that allows to restrain.Owing to be provided with two coolers 5 and 6, so the tube bank 35c of the tube bank 35c of interstage cooler 5 and aftercooler 6 all moves or is drawn out of along same direction Y.The lube oil cooler 7 of cutting oil is housed below main motor 4, and lubricant oil is used for the bearing of lubricate compressors 1 and 2 and the gear of accelerator 3; Coolant chiller 8 is used for cooling off freezing mixture, and freezing mixture is made up of the shell 1a of cooling compressor body 1 and 2 and the antifreeze liquid of 2a.Lube oil cooler 7 and coolant chiller 8 are installed into, and make their vertical direction X perpendicular to main motor 4 output shafts.The oil pump 9 of supplying lubricating oil is positioned at the top of lube oil cooler 7 and coolant chiller 8, so do not influence the taking-up of lube oil cooler 7 and coolant chiller or move.Be located at the lubricant oil filter 13 in lube oil cooler 7 cooled lubricating oil flow paths, adjacent with low pressure stage compressor 2.Coolant chiller 10 is contained in the below of aftercooler 6, a side of accelerator 3.

Said all parts in front cover every noise lid 22 with a box-like.Be fixed on a plurality of outer rim 51 every noise lid 22, outer rim 51 is fixed on the base 21 directly or indirectly, and they constitute the framework of case 50.Lid 22 also links to each other with starting panel 12, and starting panel 12 is contained on the base 21, and constitutes the part of case 50 fronts.One or more (removable) header board 52, back plate 53, side plate 54 and push up 30 and motor sucking pipes 24 all are fixed on noise lid 22.Although every noise lid 22 are plate classes, it is different with plate 52,53 and 54, because be non-disconnectable every noise plate 22 with respect to frame 51.Be connected one of among control panel 11 and demountable panel 52a, the 52b, demountable panel 52a, 52b constitute header board 52, so control panel 11 is fixed on door-plate 52a.Be contained in apart side far away door- plate 52a, 52b, 53a and the equal hinge of 53b of formation header board 52 and back plate 53.Header board 52 and back plate 53 are opposite one another.

The suction tude 18 that air is sucked low pressure stage compressor (body) 1 is contained between aftercooler 6 and the side plate 54, and compressor body 1 and 2 top also will be introduced below in detail by Figure 11.Suction tude 18 is contained on the part frame of noise lid 22, and is mounted to suction tude 18 is slided along directions X, so that split out by side plate 54.Air inlet filter 19 is contained in the suction tude 18, and air inlet filter 19 is connected with the intakeport 16 of low pressure stage compressor 1 by curved rubber hose 20.The outlet pipe 15 of motor is contained in the top of a relief opening, and this relief opening is used for emitting for cooling off the air that main motor 4 is cooled off by built-in type fan (not shown).Outlet pipe 15 is fixed on the part frame 51 of noise lid 22, and the outlet pipe 15 of a upper face is arranged, and covers with the top board 30 with exhaust port 46, also will be described in detail below referring to Figure 12 A and 12B.In motor exhausting pipe 15, comprise an exhaust cavity or manage 16, interior dress muffler 17, baffler is used for when compressor body 1 and 2 no-load runnings from compressor 1 and 2 exhausting airs, so, the air and the compressor air-discharging of discharging from motor 4 all are discharged from outside the case, but they do not link mutually.

Be shaped on the bearing 28 that uses into the crane of maintenance work at base 21 upper surfaces.Be positioned at the bearing 28 at header board 52 1 ends and side plate 54 1 end angle of cut places, also be used as the fixedly support of bar crane 36, so that carry out inspection and maintenance work, the back will be introduced in detail by means of Figure 10.

The air that enters from the intakeport of top board 30, through suction tude 18, air inlet filter 19 and curved rubber hose 20, then, and before air is inhaled into low pressure stage compressor 1, the flow control valve of expression not among the figure that flows through.Air by 1 compression of low pressure stage compressor cools off in interstage cooler 5, and by the stress level of high pressure stage compressor compresses to regulation.Then, pressurized air is discharged from outlet pipe 6a after aftercooler 6 coolings.When compressor 1 and 2 no-load runnings, through muffler 17, entered outlet pipe 16 by the air streams of compressor 1 and 2 discharges, discharge outside the case through the vent hole 45 (seeing Figure 12 A) of top board 30 then.The condensed water that generates in air- cooler 5 and 6 is discharged by the drain opening 14 of waste pipe 14a, and waste pipe 14a is located in the base 21 of side plate 54 belows.Arm 14b is connected with waste pipe 14a, and arm is provided with condensed water test valve 14c, in order to check whether condensation flow is arranged through waste pipe 14a.

As shown in Figure 3, main motor 4 drives low pressure stage compressor 1 and high pressure stage compressor 2 by accelerator 3.In the main motor 4 the fan (not shown) is housed, it sucks cooling air by motor suction tude (not shown) outside complete sets of equipment that is outside the casing of label 50.Hot air behind the cooling motor 4, is discharged outside the case 50 from the vent hole 46 (seeing Figure 12 A) of top board 30 through motor exhausting pipe 15.Internal surface at motor suction tude and motor exhausting pipe 15 is equipped with sound arrester 47 (seeing Figure 12 A and 12B), so noise can be reduced to minimum level from leaking of case 50.

The bottom of accelerator 3 is fuel tank 3b.Oil pump 9 is from the lubricant oil of fuel tank 3b sucking-off, supplies respectively through oil filter 13 to be cooled off by lube oil cooler 7 before the gear of part such as the bearing of compressor body 1 and 2 and accelerator 3 at it.The lubricant oil of aforementioned each several part in the lubrication system was filtered for 13 every days all will be checked, it is installed in the adjacent side plates place, and the frequent degree of the maintenance of lube oil cooler 7 and inspection is lower slightly, thus be contained on the stand 21a on the base 21, so that on stand 21a, pull out slidably separately or move.

Cooling compressor body 1 and 2 shell 1a and the freezing mixture of 2a circulate by means of coolant pump 10, and it cools off by cooling water in coolant chiller 8.

The cooling water that infeeds outside case 50 through being contained in the main-supply 29 on the base 21, supplies respectively toward interstage cooler 5, aftercooler 6, lube oil cooler 7 and coolant chiller 8.Cooling water in each cooler 5 to 8 behind the absorption heat gathers among the main drainpipe 29a, discharges then outside the case 50.Lube oil cooler 8 can be with cooling off through freezing mixture device 7 cooled freezing mixtures.In this case, almost can save the cleaning of lube oil cooler 8, thereby reduce upkeep cost.

Constituting this box screw compressor (assembly or equipment) 55 o'clock by the above, the space in complete sets of equipment or case 50 can make full use of, to reduce the size of case 50, so settle required volume to reduce to minimum.In addition, improved Check and Maintenance work.

By Figure 4 and 5 as seen, header board and back plate are made up of dual panel 52 (52a and 52b) and 53 (53a and 53b) respectively, two door- plate 52a and 52b (53a and 53b), as shown in phantom in Figure 5, be contained on the frame 51 of noise lid 22 with hinge, hinge respectively mutually away from side.When closing door- plate 52a, 52b, 53a, 53b, they are fixed on the central frame 31, and the configuration of central frame is similar to outer rim 51.For example by shown in Fig. 4 B, central frame 31 is made " U " shape column with an end wall 31a.End wall 31a detachably is fixed on (being the bottom outer rim in the illustrated case) on the adjacent with it outer rim 51 with screw 31b.When door- plate 52 and 53 is opened, can easily remove central frame 31.Therefore, provide convenience for Check and Maintenance work.

Control panel 11 is fixed on the front side of one of door- plate 52a and 52b (52a).The outer surface of control panel 11 becomes the part of casing 50 outer surfaces.Each parts all is contained among the casing 50 basically, and this fact shows that control panel 11 parts such as grade play part casing 50.Control panel 11 has following function, for example, starts and stop the function of compressor and equipment work; Numeral shows or represents the function of temperature, pressure, electric current, working time, number of starts and unloaded operation number of times; Show or indicate the function of catastrophic failure and non-critical failure; And, the protective function when stopping in emergency.In addition, control panel 11 moves regulatory function in addition, for example, adjusts pressure and reaches energy-saving run by determining flow automatically; Automatic stopping when unloaded stream time is long; Pipeline pressure is crossed the automatic stopping when hanging down; And follow procedure moves.In addition, it also has following prevention and Safety function: will be used for cooling equipment (as air- cooler 5 and 6 and lube oil cooler 7) cooling water temperature, after analyzing relatively with the temperature of the liquid that is cooled, show or whether the indication cooler needs the function of cleaning; According to the situation and the stress level of the pressure loss in air filter 19 and the lubricant oil filter 13, show or indicate the function of pollution condition and cleaning; And, show or indication should be to the function in moment of motor 4 supplying lubricating greases.But also have following function: the moment that the supplementary equipment of demonstration reply compressor body 1,2 is checked, the moment that reply body 1 and 2 is checked, and show the moment that should check.The control of checking the moment is the time of going through according to after the operating time of compressor body 1 and 2 and the equipment arrangement.Through the year number of regulation, this function that is had just shows or indicate and check that the moment arrives after the operating time reaches the hour number of regulation or equipment and installs.If owing to break down and automatic stopping, by Operational Limits, as just before automatic stopping instantaneous each several part temperature etc. be stored, so, even compressor 1 and 2 has quit work, also can on control panel, show or indicate instantaneous Operational Limits before the automatic stopping.Part in the above-mentioned control function of control panel 11 has been disclosed among EP-A1-0482592 and the EP-A1-0460578.

For adjusting the force value that flow is set, can be selected arbitrarily in control panel 11.Design proposal regulation, fixed pressure can not be higher than certain force value, surpass the upper limit of compressor authorized pressure to avoid pressure.If have one to change in the value of regulation, should prevent that then upper limit stress level is lower than lower limit.When the pressure reduction between them reduces to when being lower than some values, change another value that sets automatically, to keep the pressure difference of minimum permission.If the value that sets has changed automatically, this variation is shown by flashing light.

Adjust compressor (equipment) 55 throughput and when pipeline pressure descends, regulate the example of authorized pressure value, be illustrated by means of Figure 13,13A to 13D and 14 in order to start automatically.

As shown in figure 13, suppose the P of compressor ultimate pressure _Max, be limited to P on the exhaust pressure _U, be limited to P under the exhaust pressure _L, the automatic starting pressure of compressor is P _A, the floor level of starting pressure is P automatically _Amin, and specified or working pressure is P.

Compressor 55 follows these steps to (i) basically to (iv) working automatically:

(i) bring up to P as exhaust pressure P _UThe time, compressor 1 and 2 moves (no-load running) under no-load.

(ii) arrive P when exhaust pressure P is low _L, compressor 1 and 2 moves with exhausting air (load carrying) under load.

(iii) repeat above-mentioned steps (i) and (ii).

(iv) when compressor 1 and 2 is shut down, if pressure is lower than P in the pipeline _A, compressor 1 and 2 starts automatically.

Under following condition, carry out above-mentioned adjusting:

(a) be used to regulate unloaded and the compressor 1 of on-load and 2 operation.

(b) must keep following relationship: P _U＞P _L＞P _AAnd P _Max〉=P _U

This be because, if P _UAnd P _L(P reverses _L〉=P _U), just can not control compressor 1 and 2.If P _A＞P _L, then when compressor 1 and 2 duration of works, send all the time and undesirable self-drive signal, cause that each parts breaks down.

(c) if Δ P=P _U-P _LToo little, a kind of oscillatory occurences that short-term repeats between on-load and unloaded operation takes place, cause the throughput controlling component to damage.Therefore, relation Δ P should kept ₁〉=Δ P _1minSituation under determine Δ P _1min

(d) as for Δ P=P _L-P _A, determine Δ P _2minIn time, will be considered the detection mistake and the variation in pressure of pressure checking device (not shown) should keep relation Δ P 〉=P _2min

Above-mentioned adjusting and control are undertaken by the process flow diagram of Figure 13 A to 13D.

At first, when step 60, depress the method for operation alteration switch 59a of some related switch on the control panel 11 shown in Figure 14, thereby selected pressure to regulate pattern.

Then, depress pressure selector switch 59j, to select to regulate the state of the head pressure upper limit, then, flow chart is shifted to step 61, at this moment, and current CLV ceiling limit value P _UBe presented on digital display device or the screen 59b.At next step 62, light emitting diode (LED) 59c connects, and the upper limit of expression exhaust pressure reaches.If selected upper limit P _URise, press set point value increment switch 59d, make flow chart move on to step 64 from step 63.As CLV ceiling limit value P _U＜P _MaxSituation under, P _UValue increases in step 65, and the value that shows on screen 59b also changes.If P _U＜P _Max, repeating step 63 to 65, and increase CLV ceiling limit value P _UOn the other hand, do not allow selected P _UKeep relation P _U〉=P _Max, because this will make above-mentioned condition (b) not satisfy.Therefore, flow process reversion.At this constantly, send guard sign.

If reduce selected upper limit P _U, depress set point value decline switch 59e, so flow process is shifted to step 67 from step 66.In step 67, P _UValue is reduced, and the show value on screen 59b also changes.At next procedure 68, with Δ P ₁=P _U-P _LWith Δ P _1minCompare.If Δ P ₁〉=Δ P _1max, repeating step 66 and 67, and reduce CLV ceiling limit value P _UOn the other hand, if in step 68, determine Δ P ₁〉=Δ P _1max, then in step 69, change lower limit P _L, to keep relation Δ P ₁〉=Δ P _1maxIn step 70, character formula light emitting diode 59f " lower limit of exhaust pressure " (" LOWER LIMIT OF DISCHARGEPRESSURE ") switches on and off (flicker), to circulate a notice of low limit value P _LChange.In step 71, work as P _LWhen having changed as mentioned above, with Δ P ₂=P _L-P _AWith Δ P _2minCompare.If Δ P ₂〉=P _2min, repeating step 66 to 71 is so reduced CLV ceiling limit value P _UWith lower limit P _LIf determine Δ P ₂＜Δ P _2min, in step 72, change automatic starting pressure P _A, to keep relation Δ P ₂=Δ P _2min, in step 73, character formula LED59g " starting pressure automatically " (" AUTOMATIC STARTING PRESSURE ") switches on and off (flicker), to circulate a notice of automatic starting pressure P _AChange.If further reduce CLV ceiling limit value P _A, then repeating step 67 to 73.

If confirm by increasing or reduce CLV ceiling limit value P _UCan make CLV ceiling limit value P _UBecome predetermined value, then depress and adjust main switch 59h, make flow process cross step 63 or 66, through step 74 to step 75, in step 75, alphanumeric display 59c " upper limit of exhaust pressure " (" UP-PER LIMIT OF DISCHARGEPRESSURE ") stops flicker.In step 76, continue to use the value P that determines in each step in front _U, P _LAnd P _A,, and in step 77, finish the pressure adjustment state as current set point value.

Change pattern when depressing mode switch 59a selection pressure, and depress the lower limit P that pressure selector switch 59j selects exhaust pressure _LThe time, flow process arrives step 78, at this moment, shows decline P on screen 59b _LCurrency.At next procedure 79, the LED59f of indication exhaust pressure lower limit is switched on.

If increase lower limit P _L, then depressing increases switch 59d, makes flow process move to 81 from step 80.At Δ P ₁=P _U-P _LWith Δ P _1minBetween compare.If Δ P ₁＞Δ P _1min, then in step 82, increase P _LSo value, and repeating step 80 to 82 are lower limit P _LIncrease.If judge Δ P ₁≤ Δ P _1min, condition (c) does not satisfy so.Therefore, do not allow to increase P _L, flow process is returned.Send guard sign constantly at this.

If reduce lower limit P _L, depress and reduce switch 59e, make flow process move on to 84 from step 83, in step 84, P _LValue is lowered.Step 85 to 87 in, be similar in step 71 to 73 P _LBe lowered to a predetermined value, if necessary, also reduce P _AValue.

If judge drop-out value P in to 87 in step 80 _LCan increase or reduce to predetermined value, then be similar to the situation of front, press and adjust main switch 59h, so flow process moves on to step 74 to 76 from step 80 or step 83, so fixed value P _LAnd P _ABe applicable to as the current selected value.Then, the pressure pattern of regulating finishes in step 77.

Similarly, when utilizing mode switch 59a selection pressure to regulate pattern, and utilize pressure selector switch 59j to be chosen as and regulate automatic starting pressure P _APattern, then flow process arrives step 88, in this step, starting pressure P automatically _ACurrency be displayed on the screen 59b.In next procedure 89, indicate the LED59h of automatic starting pressure to be switched on.

When increasing automatic starting pressure P _AThe time, depress increment switch 59d, make flow process from step 90 to step 91.In step 91, with Δ P ₂=P _L-P _AWith Δ P _2minCompare.If Δ P ₂≤ P _2min, in step 92, increase P _A, and repeating step 90 to 92, so automatic starting pressure P _ARise.If in step 91, differentiate Δ P ₂≤ P _2min, then condition (d) does not satisfy.Therefore, do not allow to increase P _A, flow process is returned.Carve at this moment, guard sign is connected.

When reducing automatic starting pressure P _AThe time, depress depreciation switch 59e, make flow process from step 93 to step 94.If pressure is higher than minimum automatic starting pressure P _Amin, the step 93 that repeats to 95 in, reduce P once more in step 95 _A

Work as P _AWhen reaching predetermined value, depress main switch 59h, thus step 74 to 77 in this automatic starting pressure P _ABe chosen to be currency.

Be illustrated in the pressure adjust system in Figure 13,13A to 13D and 14, in the time of can guaranteeing to avoid owing to wrong the adjusting problem take place, and can fundamentally avoid wrong adjusting.

Above-mentioned adjustment is finished by regulator shown in Figure 3 97, and this regulator 97 comprises a microprocessor, wherein contains the program by flow process shown in Figure 13 A to 13D.

Fig. 6 is a plane view, is expressed as will carrying out in the complete equipment part of regular maintenance or routine check.Near header board 52 places that control panel 11 is housed, that check has grease-added hole 56, lubricant oil oil level dip stick 57 and a lubricant oil oil-feed port 58.In addition, be lubricant oil filter 13 and air-cooler condensate drain outlet 14 near adjacent side plate 54 places.Header board 52 and side plate 54 are added in side or direction D and the E that carries out current check.Therefore, the operator need not for current check around compressor 55 motions.In addition, installation casing 50 required spaces reduce and/or settle the space and the service clearance of the needs of compressor apparatus 55 all can reduce.

Fig. 7 represents to move or extract out the direction Y1 of interstage cooler 5 tube banks and aftercooler 6 tube banks.After header board 52 opened, can move interstage cooler 5 and aftercooler 6 along direction Y1 by the header board of opening 52.

Fig. 8 is a side view, and the approach of interstage cooler 5 is outwards pulled out in expression slidably.For example, after header board 52 and side plate 54 are opened, pull down high pressure stage sucking pipe 32.Unclamp the nut 27b among Fig. 4 A, the support 27 that is fixed before this moves down.When castor 25 is placed on the track 26, just interstage cooler can be moved along direction Y1.Owing to can easily whole interstage cooler 5 be taken out outside the case 50, so cleaning can be carried out easily.

Fig. 9 is a plane view, has represented the situation of end cap 33 opening/closings of air-cooler (interstage cooler 5 and aftercooler 6).Fig. 9 represent structure for example, it is designed at the end cap 33 of air outlet slit end also double as is the mist separator of cooler 5 and 6, it can open and close.End cap 33 is fixed on the flange of cooler casing 35 with screw 33a usually, can pull down set screw 33a when conducting a survey with maintenance work, so that allow the joint pin 34a of the hinge mount 34 of end cap 33 windings on cooler casing 35 to rotate.Therefore, cleaning and inspection work are convenient to carry out.During this embodiment's structure is provided with, the rotating center of hinge mount 34 is located at the leading edge locus of end cap 33, so the required space of ON/OFF end cap 33 is minimum.Because the joint pin suction hole 33b of hinge mount 34 or end cap 33 is elongated holes, thus when opening end cap 33 joint pin 34a longitudinally Y1 is slightly mobile.Therefore, when opening and closing action, can protect round section joint ring and liner to be without prejudice.

Figure 10 represents installation check and the maintenance situation of hoist.When the maintenance supplementary equipment, pull down header board 52, side plate 54, part outer rim 51 etc.The principal post 36 of bar crane is contained on the bearing 28, and bearing 28 is positioned at the angle of cut place of header board 52 (or its extension) and side plate 54 (or its extension).Pivoted arm 37 is contained on the column 36, so winch can hoist each parts or equipment.Can removing of side plate 54 1 sides, so parts or equipment can take out along same (opening) direction every noise lid and framework 51 thereof.Bar crane 36,37 and 38 can be contained in the casing 50.When needs overhaul whole complete sets of equipment 50, remove the plate 22,52,53 and 54 that constitutes casing 50, then, other three root posts 39 (wherein cannot see in the chromosome) that dotted line is represented among the figure and column 36 together, being installed on 4 bearings 28 on the base 21 (has expression in 3 support graphs).In addition, beam 40 and mobile bridge 41 are mounted to each parts that can lift by crane in the complete sets of equipment 50.

Figure 11 represents to take out or move forward into the method for tracheae 18.Flange 18a and 18a are located at the top of suction tude 18, so suction tude 18 is suspended from two beams 43 that extend perpendicular to side plate 54.When carrying out service work, to open or remove top board 30 and side plate 54.Then, remove the framework 42 of side plate 54 tops between outer rim 51 earlier, then suction tude 18 is pulled out towards the surface direction of side plate 54, to remove suction tude 18.Because the flange portion 18a of suction tude 18 can slide on beam 43, so be easy to it is split out along direction X1.After splitting out suction tude 18, the central authorities of side plate top open wide, so be easy to the parts in the complete sets of equipment 50 are hung out with hoist.

Figure 12 A and 12B represent outlet pipe 16 and the motor exhausting pipe 15 under the unloaded operation.The outlet pipe 16 of interior dress muffler 17 is in motor exhausting pipe 15, and it separates with the exhaust passage of motor 4.Discharge via muffler 17 from compressor 1 and 2 air of discharging during unloaded operation, then, exhaust is flowed out casing 50 by the relief opening 45 of top board 30.The air that discharge from motor 4 cooling motor 4 back, through motor exhausting mouth 44 by motor exhausting pipe 15.Then, air is discharged outside the casing 50 through motor exhausting mouth 46.The inwall of motor exhausting pipe 15 is added with sound arrester 47, with noise insulation.Before the air of discharging from motor 4 is outside it discharges casing, flow, so can reduce to minimum degree from the noise transmission and the thermal radiation of outlet pipe 16 in casing 50 around outlet pipe 16.Because relief opening 45 is adjacent with the motor exhausting mouth, so, can converge by exhaust and cool off with motor 4 from the thermal exhaust of complete sets of equipment 50.

According to the present invention, daily and customary inspection work can be easy to carry out, and can shorten the time of finishing inspection work.In addition, can reduce for carrying out the needed space of service work, so, all can reduce in the restriction aspect the equipment installation such as installing space and installation direction etc. at present.Therefore, design of plant can compare flexibly.

Also have, owing to service work can be carried out easily, so the M R cost reduces.

In addition, owing to reduced the space of M R, so can more freely finish installment work.

Because whole cooler is easy to split out, finish the required time of service work so can shorten.Therefore reduced the cost of overhaul.

Because the end cap of air-cooler is easy to open or close, so can carry out the service work of air-cooler easily.Therefore reduced the cost of overhaul.

Because the space is used in the maintenance of coolant chiller and lube oil cooler etc., but the used service clearance of common air cooler, so, can reduce to install the required space of compressor.

Owing to can pull down suction tude by square hard place, so when Check and Maintenance is worked, can be easy to each parts and carry out service work.Therefore, maintenance and recondition expense have been reduced.

Owing to can save equipment such as crane for example is installed on ceiling, can reduce so the required expense of compressor is installed.

Because the exhaust of heat does not flow into motor, so improved reliability.

Because the space in the casing can make full use of, thus the size of this complete sets of equipment can be reduced, and make maintenance be easy to carry out.

Referring to Figure 16 to 18,20 and 21, introduce a most preferred embodiment of mainly forming below by the rotor portion of low pressure stage compressor and/or high pressure stage compressor body 1 and 2.

As shown in figure 16, the female rotor 102 that has the male rotor 101 of the outer double wedge 101a of screw shaped and have a screw shaped indent tooth 102a is 152 supported by bearing, rotor 101 and 102 is rotated in shell 151 in discontiguous mode, but make the tooth 101a and the mutual mating engagement of 102a of rotor 101 and 102,152 (not expressions in the bearing figure of opposite side) are bearing in the shell 151.These two rotors 101 and 102 are connected to each other by means of synchromesh gear 153 and 154.

The male rotor 101 shown in Figure 16 and the lobe 103 of female rotor 102 are heated to and toast the same temperature of PFA coating, are lobe 103 oil removings under this temperature.Then, by surface roughening as symbol R among Figure 17 is represented of the rotor 104 of for example carbon steel system, Figure 17 has represented the part of rotor matrix.Be coated with on the rough surface 104a with bottom 105, then with its drying.Then, PFA coating 106 is added on the dry undercoat 105, toasts this whole part then.

As disclosing in " LATEST FLUOROPOLYMER COATING TECHNOLOGY " (fluoropolymer coating new process) (publication of Epote Co., Ltd) p.p8 and p.p304, the structure of PFA is as follows:

X wherein and n are positive integers.For example, can buy Teflon PFA (trade mark) identical materials of trade mark and Dupont from Mitsui Dupont Prolochemical company.

Figure 18 has represented the process of PFA coating in detail.At first, the matrix 104 (seeing Figure 16 and 17) of each lobe 103 on each dry helical-lobe compressor 1 and 2 the screw rotor.Be worked into and have predetermined shape.Then, the matrix 104 of lobe 103 is heated oil removing operation 107 under the identical temperature when the baking PFA coating.Then, matrix 104 is cooled to handle the room temperature in workshop, and by carrying out the coating surface roughening that aluminium-plated ball operation 108 makes lobe 103 matrixes 104.Then, clean rough surface 104a by scrubbing operation 109, then carry out prime operation 110, coating is made up of some materials, for example PFA particle, pigment and Bond.111 pairs of undercoats of operation carry out drying then, and operation 112 is carried out 300 ℃ to 350 ℃ previously baked to it, then make it cooling.Carry out the coating operation 113 of PFA film then.After confirming that the PFA film has obtained drying in operation 114, it is toasted (operation 115) under 390 ℃ to 420 ℃ temperature.Make it cooling (operation 116) then, measure the thickness of PFA thin layer 106.If do not reach predetermined thickness, repeat the operation 113 to 116 among Figure 18, to reach desired thickness.

Figure 21 represents to constitute the process of PFA coating.In this process, the base coat solution 132 by PFA particle 131, Bond, pigment and water mix and mutual diffusion forms is coated in above-mentioned prime operation 110 on the rough surface 104a of rotor matrix 104.After finishing drying process 111 and prebake conditions operation 112, the bottom 105a after in operation 113 solution 134 of PFA particle 131 being coated in prebake conditions carries out drying then.Dry by the fire burning in 115 pairs of integral body of next operation, so the PFA particles fuse on rotor matrix 104, has constituted the continuous rete 105,106 that is coated with.When carrying out the PFA coating, the variation of the situation of filming own is open in above-mentioned " LATEST FLUOROPOLYMER COATINGTECHNOLOGY " p.p104.

Then, compare by PTFE (teflon) coating of PFA coating of the present invention with routine.

Though for the common process program that constitutes the PTFE coating is similar to shown in Figure 22ly, being coated in rotor matrix 104 lip-deep PTFE particles 136 is not fusing, but by keeping piling up of their particle shapes to constitute PTFE film 135.Numeral 137 expression PTFE base coat solution, 138 represent the PTFE undercoat of prebake conditions or short-term baking, 139 expression PTFE coating master solution.Among the situation of PTFE film also has been disclosed in above-mentioned " the LATEST FLUOROPOLYMER COATINGTECHNOLOGY " p.p104.

Though the corrosion resistance of PTFE particle 136 is similar to PEA particle 131, it is to form this fact by simple heap of PTFE particle that PTFE films, and forms pore along particle 136 and 136 interconnected zones easily.Therefore, compare with PFA film 106, PTFE films 135 thickness must be thicker, so that have gratifying corrosion resistance.In other words, even PFA film 106 its thinner thicknesses also can have gratifying corrosion resistance.

Then, will be by PFA coating of the present invention and traditional MoS ₂Coating is contrasted.

Figure 19 and the traditional MoS of 23 expressions ₂The technological process of coating and formation MoS ₂The process of filming.

At MoS ₂In the coating process, after oil removing operation 118 and blasting process 119 are finished, carry out that manganese phosphate handles 120, washing 121 and operations such as dry 122, film so on rotor matrix 104, constituted manganese phosphate.Then, scrub operation 123, then carry out MoS ₂Coating operation 124 and drying process 125 are so heaped the MoS of dead leaf shape ₂Particle 141.Carry out prebake conditions 126 and roasting procedure 127 then, MoS ₂Particle 141 usefulness burl agent bond together.MoS ₂The MoS of the structure of coating for piling up ₂ Particle 141 is filled with Bond in gap between particles.If Bond and phosphate coating 140 have suffered the high temperature more than 200 ℃, then their corrosion resistance can degenerate.Therefore, at MoS ₂Be easy to form pore between the particle 141 and 141.Because adiabatic compression is higher than 200 ℃, MoS so the air temperature in dry type helical-lobe compressor compression chamber rises to sometimes ₂The good corrosion resistance of coating can not keep all the time.

On the other hand, the PFA coating then makes the continuously uniform PFA particle 131 that the surface coverage of rotor matrix 104 fusing and solidified.Therefore, be not easy to form pore, thus even PFA films 106 thickness very little (50 microns or thinner), still can obtain gratifying corrosion resistance.Because the PFA particle 131 in PFA coating 106 is melted and constitutes an integral body, so needn't worry to be coated with rete 106 owing to nodular powder descends slowly and lightly to damage.

Because PFA has non-adhesive characteristic, so little space between impurity (as dust in air) intrusion male rotor 101 and female rotor 102, or when invading between the compression cavity case 151 of rotor 101,102 and each compressor body 1 and 2, be discharged from easily.Therefore, needn't worry too much that rotor 101 and 102 has the problem that obstruction takes place.

When adding the PFA coating by the rotor 101 and 102 that is dry type helical-lobe compressor 1 and 2 as mentioned above, can prevent from rotor 101 and 102, to get rusty, and can avoid in the little gap between rotor 101 and 102 or rotor 101 and 102 and shell 151 between block because of getting rusty.Thereby can avoid rotor 101 and 102 to block owing to getting rusty.

Resistance or braking force measurement result are changeed in executing of the curve representation dry type rotor of helical lobe compressor of Figure 20, and the lobe of compressor drum is added with MoS ₂Coating or PFA coating (the Teflon PFA (trade mark) of Mitsui DuPont Florochemical company), measurement result is estimated by the needed moment of torsion of rotary rotor, and rotor is periodically made rotor produce obstruction with forcing them to get rusty behind the brine spray.And have traditional MoS ₂The rotor of coating relatively after, so as seen from Figure 20 fact, the rotor that promptly has the PFA coating is preventing that rotor from can have more satisfied effect aspect getting rusty.Therefore worry not too that rotor can produce obstruction owing to getting rusty.

As mentioned above, if be added with the PFA coating on the lobe of screw rotor, getting rusty of screw rotor lobe can be reduced to minimum level.Even given birth to rust in shell, the non-adhesive characteristic of fluororesin can prevent that rotor from being braked by the rust staining of shell.Consequently, can avoid rotor being braked in the gas compression chamber owing to getting rusty.

Although to a certain extent optimised form of the present invention is described, but be interpreted as, optimised form disclosed by the invention at aspects such as the combination of CONSTRUCTED SPECIFICATION and each several part and configurations, can be made change not deviating under the situation of the spirit and scope of claims of the present invention hereinafter.

Claims (1)

1. dry type helical-lobe compressor comprises:

Male rotor with the outer double wedge of screw shaped;

Female rotor with screw shaped indent tooth; And

A shell, male rotor and female rotor are bearing in this shell by the bearing that is contained in the shell, and are connected to each other by synchromesh gear, the contactless rotation of male rotor and female rotor, and the mutual tight engagement of the tooth of rotor,

It is characterized in that: each in male rotor and the female rotor is coated with one deck tetrafluoroethylene-perfluoroalkyl vinyl ethyl ether copolymer.

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