齿轮泵简介(中英对照)

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1、Gear pumpChinese Name: gear pumpName: gear pumpDefinition: rely sealed in a housing of two or more gears, the work space is generated in the process of mutual engagement volume change to liquid delivery pump.Applied disciplines: mechanical engineering (a subject); drive (two subjects); hydraulic tra

2、nsmission (two subjects)The gear pump is to rely on the change and moving of the working volume of the pump cylinder and the ring gear formed between rotary pumps for conveying liquid or so pressurized. Form two closed space by two gears, pump, front and rear cover, when the gear is rotated, the gea

3、r is disengaged from the side of the space volume grew larger, forming a vacuum, the liquid suction, the gear meshing side of the volume of the space from large small, while the liquid squeeze into the pipeline to go. The suction chamber and the discharge chamber is spaced by two gears meshing line

4、to. The outlet pressure of the gear pump is entirely dependent on the size of the pump source resistance.The concept of the working principle of the gear pump is very simple, i.e. in its most basic form is the same as the two dimensions of the gear in a close fit within the housing. The engagement r

5、otation, the interior of the housing is similar to the 8 shape, the two gears are mounted on the inside, the outside diameter of the gear, and both sides of the housing close fit. From the extruder, the material in the suction port into the middle of the two gears, and to fill this space, the rotati

6、on direction of the housing with the teeth movement, and finally discharged in the two toothing. Speaking in terminology, gear pump, also called a positive displacement device, i.e. as a cylinder bore of the piston, when one tooth into the fluid space of another tooth, the liquid is mechanically squ

7、eezed row out. Because the liquid is incompressible, so the liquid and the tooth at the same time can not occupy the same space, so that the liquid has been excluded. This phenomenon continuously occurs due to the continuous engagement of the teeth, and, therefore, at the outlet of the pump provides

8、 a continuous excluded volume pump per revolution, the same amount of discharged. With the uninterrupted rotation of the drive shaft, the pump also continuously discharged fluid. The pump flow is directly related to the speed of the pump.In fact, in a pump with a small amount of fluid loss, which ma

9、kes the efficiency of the operation of the pump can not reach 100%, because these fluids are used to lubricate bearings and gears on both sides, and the pump body can never be a clearance fit, so can not make 100% of fluid from the outlet, so a small amount of fluid loss is inevitable. However, the

10、pump or can run well, can still reach an efficiency of 93% to 98% for most of the extrudate,. Viscosity or density changes in the process fluid, the pump will not be much of an impact. If there is a damper, for example in the outlet side accommodates a strainer or a limiter, the pumps will push flui

11、d through them. If the damper changes in their work, i.e., if the filters become dirty, clogged, or the back pressure of the limiter, the pump will continue to maintain a constant flow rate, until the device of the weakest parts of the mechanical limit is reached (usually equipped with a torque limi

12、ter). The rotational speed of a pump, in fact, is limited, which mainly depends on the process fluid, and if the transmission is oil, the pump can be rotated at high speed, but when the fluid is a high viscosity of the polymer melt body, this restriction will be substantially reduced.Promote the hig

13、hly viscous fluid to enter the intake port side of the two tooth space is very important, if this space is not filled, then the pump would not discharge the flow of accurate, so the value of PV (pressure x velocity) is another limiting factor, and is a process variable. Because of these limitations,

14、 the gear pump manufacturer will provide a range of products of different specifications and displacement (for each revolution of the amount discharged). These pumps will be compatible with the specific application process to make the system optimal capacity and price. PEP-II of the pump gear and sh

15、aft are of integrally quintana hardened process, to obtain a longer working life. D type bearing a combination of forced lubrication mechanism, so that the polymer via a bearing surface, and returns to the inlet side of the pump, in order to ensure effective lubrication of the rotation shaft. This f

16、eature reduces the possibility of retention and degradation of polymers. Precision machining of the pump shaft exact fit, to the bearings and gears of the D type can ensure that the gear shaft is not eccentric, to prevent the gear wear. The Parkool sealed structure with PTFE lip seal a water-cooled

17、sealed together. Such seals do not actually touch the surface of the shaft, its sealing principle is that the polymer is cooled to a semi-molten state and form a self-sealing. May also be used Rheoseal sealing it in a reverse spiral groove seal sheet processing, the polymer can be anti pressed back

18、imported. For ease of installation, the manufacturer to design an annular bolt mounting surface to enable the flange installation cooperating with other devices easier, which makes the manufacture of the cylindrical flange.PEP-II gear pump with heating element matches with the specifications of the

19、pump, available to users matching, which can ensure the rapid heating and heat control. Different pump body heating mode, the damage to these components only a board, independent of the entire pump. The gear pump is driven by a separate motor, effectively blocking the upstream pressure pulsation and

20、 flow fluctuations. Gear pump outlet pressure pulsation can be controlled within 1%. In the extrusion production line using a gear pump, and can improve the speed of flow rate output, and to reduce the shearing of the material in the extruder and resides The external gear pump is the most widely use

21、d as a gear pump, the general gear pump is usually refers to external gear pump. Its structure is shown in Figure 5-14, the main drive gear, driven gear, pump, pump cover and safety valve. The sealed space gear pump pump, pump cover and gear constitute studio. Two gear axle are fitted respectively i

22、n the two bearing bore of the pump cover, out of the pump body, the driving gear shaft driven by the motor rotation. External gear pump is simple structure, light weight, low cost, reliable work, a wide range of applications. Gear pump working, driving wheel with the motor to rotate and drive the dr

23、iven wheels to follow the rotation. When the suction chamber side of the meshing teeth gradually separate, the volume of the suction chamber is increased, the pressure is reduced, put the liquid suction pump suction human tube; suction liquid two routes in the alveolar gear pushed onto the discharge

24、 chamber. Liquid into the discharge chamber, since the two gear teeth continuously engaged, liquid is squeezed from the discharge chamber into the discharge pipe. Driving gears and driven gears are constantly rotating, the pump can be continuous suction and discharge liquid. Equipped with a safety v

25、alve, a pump, conveying the liquid may be automatically open the top valve, so that the high pressure liquid is returned to the suction pipe when the discharge pressure exceeds a predetermined pressure. The internal gear pump, the inner gear, by a pair of mutually meshing and the middle of the cresc

26、ent-shaped member, the pump casing and the like. The crescent-shaped member is spaced from the suction chamber and a discharge chamber. When the pinion gear is rotated, a partial vacuum is formed, in the place of the gear is disengaged, the liquid being sucked A pump filled with the suction chamber

27、interdental, and then along the inner and outer sides of the two routes of the crescent-shaped member into the discharge chamber. In place of the tooth into engagement, the liquid present in the interdental is extruded while the feed discharge tube. Gear pump with self-priming capability, flow and d

28、ischarge pressure independent pump casing, suction valve A and the discharge valve has a simple structure, uniform flow, reliable, low efficiency, noise and vibration, easy wear, used to transport non-corrosive, non-solid particles and various oils with lubricating ability, the temperature is genera

29、lly not more than 70 C, such as lubricating oil, edible oil. The general flow range of 0.045 30ms / h, pressure range of 0.7-20MPa, working speed 1200-4000r/min.Structural featuresGear ninety people advanced level of new technology - dual arc sine curve tooth arc. Involute gear, the most prominent a

30、dvantages Tooth Surface gear meshing process there is no relative sliding tooth surface wear, and stable operation the trapped fluid phenomena, low noise, long life, high efficiency. The pump to get rid of the shackles of the traditional design into a new area in the design, production and use of th

31、e gear pump. The pump has a differential pressure relief valve as overload protection, safety valve total reflux pressure pump rated discharge pressure of 1.5 times. Allows discharge pressure range in accordance with the actual need to be adjusted separately. But this safety valve for not reducing v

32、alve long-term work, the need to separately install the pipeline.The shaft end seal design for the two forms, a mechanical seal, a packing seal, can be determined according to the specific use conditions and user requirements.Operation and maintenance, start:Gear pumps(1) before the start of check a

33、ll pipe flange joint tightness.(2) coupling plate moving without friction and collision sound.(3) The first time you start the pump should be injected into the transmission fluid.(4) before the start of fully open suction and discharge valve in the pipeline, the non-closing valve starts.(5) Verify t

34、hat the motor rotation direction, start the motor.2, Parking:(1) Turn off the motor.(2) Turn off the pump inlet and outlet valves.Common faults can not discharge(1) failure phenomenon: the pump can not dischargeGear pump the whole picture (3) the cause of the malfunction: a rotating in opposite dire

35、ctions; b, suction or discharge valve closed; c, the entrance no material or pressure is too low; d, the viscosity is too high, the pump can not bite materialCountermeasures: a, confirm the direction of rotation; confirm valve is closed; c, check valves and pressure gauges; d, check the liquid visco

36、sity, low speed according to the speed ratio of the flow, if flow is insufficient flowsInadequate flow(2) failure phenomenon: pump flow the lack KCB300 gear pumpThe cause of the malfunction: a, inhalation or discharge valve closed; b, low inlet pressure; c export pipeline blockage; d, stuffing box l

37、eakage; e, the speed is too lowCountermeasures: a confirmation whether the valve is closed; b, the check valve is open; c confirm excretion is normal; d, fastening; drain large leak affecting production, should stop operation, demolition inspection; e, check the pump shaft speed ;Abnormal sound(3) f

38、ailure phenomenon: abnormal sound The cause of the malfunction: a coupling the the eccentric big or poor lubrication b, motor failure; abnormal c reducer; to poor installation d seal at; e shaft deformation or wearCountermeasures: a look for positive or filling grease; b, check the motor; c, check t

39、he bearings and gears; d, check the seal; e, parking disintegration of inspectionCurrent is too large(4) failure phenomenon: the current to excessive gear pump seriesThe cause of the malfunction: a outlet pressure is too high; b, the melt viscosity is too large; poor c, shaft seal assembly; the d sh

40、aft or bearing wear; e, motor failureCountermeasures: a to check downstream equipment and piping; b testing viscosity; c, check the seal properly adjusted; d, parking after checking hand drive cars are overweight; e, check the motorPump suddenly stopped(5) failure phenomenon: the pump suddenly stopp

41、edThe cause of the malfunction: a power outage; b, motor overload protection; c coupling damage; d, the outlet pressure is too high, the chain reaction; e pump, biting into the anomaly; f, shaft and bearing adhesive stuckCountermeasures: a, check the power;, check the motor; c, f turning to open the

42、 safety cover, turning checks; d check the instrumentation interlock system; e, after stopping, reversing turning confirmed; confirmSeal oil spill(6) failure phenomenon: sealing oil spillCause: a shaft seal is not adjusted, seal wear between fine c mechanical seal dynamic friction surface of the sta

43、tionary ring with bad four spring relaxationCountermeasures: a re-adjustment of b, the right amount tighten the gland bolts or replace the seals, c, replace the dynamic and static ring or reground, four replacement springOther phenomena1 causes(1) internal and external rotor backlash too the suction

44、 pressure oil chamber interoperability. Significantly reduce the volumetric efficiency, the output flow is not enough; axial clearance is too large; the suction line junction surface Mifengbuyan the other reasons, so that the pump into the air, effective suction flow reduction; Suction poor. As a re

45、sult of the oil viscosity is too large, the oil filter clogged by dirt as a result of the inhalation flow reduction; relief valve stuck in the half-opening position, part of the pump to the flow back to the tank through the relief valve, and making the traffic into the system is not enough. At this

46、time accompanied by a failure do not increase the system pressure.2, Remedy replace the inner and outer rotor, the tooth side of the gap within a predetermined range (typically less than 0.07 mm); both ends of the grinding pump surface, to ensure that after the assembly of the rotor inside and outsi

47、de the axial gap in the range of 0.02 0.05mm;(3) replacing defective suction pipe seal, bandaged pipe fittings threaded portion and then tighten fittings with Teflon tape;(4) appropriate viscosity oil, washing oil into the oil filter to make oil-absorbing smooth. And, where appropriate, to increase

48、the oil absorption diameter; repair relief valve, to exclude relief valve shorted fuel tank caused the pump effectively reduced flow phenomenon. Edit this paragraph the trapped oil phenomenon gear pump to a smooth work, the degree of coincidence of the gear must be greater than 1, so there are alway

49、s two pairs of gears engaged simultaneously, and a part of the oil is siege surrounded by a closed cavity in the two pairs of teeth between. This closed cavity begins with the rotation of the gear is gradually reduced, and later gradually increased. Closed chamber volume decreases causes trapped flu

50、id by squeezing generate high pressure, and is extruded from the gap, leading to fluid heating, and to enable the parts to subject to additional loads; while the increase in volume of closed chamber also caused a partial vacuum, and dissolved in the oil in the gas separation, the occurrence of the c

51、avitation. These will generate a strong vibration and noise, which is a gear pump phenomenon of trapped oil.Harm The radial imbalance force is large enables the shaft bending, the tooth tip in contact with the housing, while the accelerated wear of the bearings and reduce the life of the bearing.Eli

52、mination Method to eliminate the trapped oil, usually in the both sides of the cover open unloading groove, so that the volume of the closed chamber is reduced through the left unloading groove communicates with the oil pressure chamber, the volume increases when the unloading tank with the suction

53、chamber through the right side connected.Feasible circuit performance to improve the performance of gear pumpGear pumps due to the structural constraints of the fixed displacement gear pump is generally considered only for the constant flow hydraulic source. However, the accessories and threaded cou

54、pling combination valve program is effective for improving its functionality, reduce system cost and improve system reliability and, therefore, the performance of the gear pump approachability expensive, complex piston pump. Mounted directly on the pump control valve, eliminating the need for tubing

55、 between the pump and the directional valve, to thereby control the cost. Fewer fittings and connectors to reduce the leak, and to improve reliability. And the pump itself valve can reduce the loop the loop pressure to improve the performance of their work. Here are some of the basic functions of th

56、e gear pump can improve the loop, some of which is proved to be feasible practice basic loop, and some of the innovative research.Uninstall loop Uninstall components will combine high flow pump with low-power single-pump. The liquid from the two gear pump due to the structural constraints of the fix

57、ed displacement gear pumps usually considered only for the constant flow hydraulic source. However, attachments and threaded coupling combination valve program to enhance its functionality, reduce system cost and improve system reliability to be effective, therefore, gear pumps, fixed displacement d

58、ue to structural constraints, usually considered only for constant flow gear pump hydraulic source to use. However, the accessories and threaded coupling combination valve program is effective for improving its functionality, reduce system cost and improve system reliability and, therefore, the perf

59、ormance of the gear pump approachability expensive, complex piston pump. Performance accessible expensive, complex piston pump. The outlet, until it reaches a predetermined pressure, and (or) traffic. At this time, the large flow pump put flow from the outlet is recycled to the inlet, thereby reduci

60、ng the output flow of the pump system, the upcoming pump power is reduced to just above the desired value of the high-pressure part of the work. The percentage depends on the flow rate decreases not uninstall displacement ratio of total displacement. Combination or threaded coupling unloading valve

61、to reduce or eliminate the pipes, channels and accessories, and other possible leaks. Easiest unloading member by manual manipulation. Spring unloading valve is turned on or off, when a manipulation of the signal to the valve, the valve off state is switched. Leverage or other mechanical agencies is

62、 the easiest way to manipulate this valve. Guidance and control (pneumatic or hydraulic) unloading valve is an improvement of the mode of operation, because such valves can be remotely controlled. Its greatest progress is a solenoid valve controlled by an electrical or electronic switch, it is not o

63、nly the available remote control available microcomputer automatic control, generally considered this simple unload technology is the application of the best case. The artificial manipulation uninstall components commonly used in large flows and fast action to be large flows and reduce the flow loop

64、 for precise control, such as rapid telescopic boom circuit need for fast action. Unloading valve of the circuit shown in Figure 1 without the manipulation of the signal effect, the large flow loop always output. For a normally open valve, in the normal state the loop will output a small flow. Press

65、ure sensing unload valve is the most common solution. As shown in Figure 2, the spring action of the unloading valve is in its flow position. Circuit pressure relief valve preset value is reached, the relief valve to open, the uninstall switch valve in the hydraulic and under to its small flow position. The pressure sensing uninstall circuit used for the trip to their fast, low speed high pressure fluid supply of the hydraulic cylinder when the end of the trip. Pressure sensing unloader valve base is basically a reach sy