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Gear pump common problem sweeping
Source: Bearing network time: 2014-03-01
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1. Causes and sweeping of oscillation and noise
(1) Inhalation air 1CB-B gear pump body and the two end caps are hard seals for direct touch; if the flatness of the touch surface does not meet the regulatory requirements; the pump simply draws in air during operation, the same; The end cover and the gland are also directly touched; the air is also simply invaded, if the gland is a plastic product; because it is damaged or deformed due to temperature changes; it will also make the seal not enter the air and remove the problem. The method is: when the flatness of the pump body or the pump cover does not meet the regular requirements; it can be ground back and forth on the flat plate with the "8" shaped road with gold steel sand; it can also be ground on a surface grinder; Do not exceed 5μm; and need to ensure the straightness of the plane and the hole, about the leakage of the pump cover and the gland; can be sealed with an adhesive such as epoxy resin.
2 The pump shaft is usually sealed with a skeleton oil seal. If the tension spring of the lip is dropped, or the oil is packaged backwards; or the lip is pulled or aged, the back end of the oil seal is often under negative pressure. Inhaled air; usually replaced with a new oil seal for disposal.
3 The oil volume in the fuel tank is not good; or the oil suction pipe port is not inserted below the oil surface; the pump will take in the air; at this moment, the oil should be replenished to the oil mark line in the fuel tank, if the oil return port reveals the oil surface; sometimes it is due to the system. The internal pressure is negative and the air is backed into the system; therefore, the return pipe should normally be inserted below the oil level.
4 The orientation of the pump is too high for the oil level; especially when the pump speed is reduced; because the pump suction chamber does not have the necessary vacuum to form a lack of oil and draw in air. At this point, the relative height of the pump and the oil level should be adjusted; Satisfaction with the requirements of the rules.
5 oil-absorbing oil filter is blocked by dirt or its capacity. Jia Zhangtuo 枇υ黾 肟 肟 3 3 3. 3. 鲇 诘 诰 诰 诰 诰 诰 诰 . . . . . . . . . . . . . . . . . . . . . . . . . Or choose a larger capacity, and the right and the wrong diameter of the oil filter. This way; not only can avoid the inhalation of air; but also avoid noise.
(2) The mechanical edge is caused by the oscillation of the connection between the pump and the coupling due to irregular requirements. The coupling should be adjusted according to the requirements of the rule.
2 Noise occurs due to dirt in the oil entering the pump, causing wear and tear on the gears and other components. The oil should be replaced; the filtration should be strengthened; the pump should be dismantled to remove the severely worn gears; it must be repaired or replaced.
3 Damage or wear of the pump parts will cause oscillation and noise: such as tooth shape error or large weekly error; poor gear contact; high surface roughness; common normal length; flank The value of Mu Yuhui is still participating in the restoration of the rose. At this moment; replace the gear or the gear pair. Together; the bearing needle holder damage, the long and short shaft journal and needle wear, etc.; can cause the bearing to rotate poorly Mechanical noise occurs; the gear pump needs to be removed at this moment; replace the needle bearing.
4 gear axial device clearance. Huai è‹ä¾„å—£å¬—è‚ è – è – 涞 涞 涞 涞 é› è™ºè‹ è™ºè‹ è™ºè‹ è™ºè‹ è™ºè‹ è°§ è°§ è°§ è°§ è°§ è°§ æ·æ‡Š æ·æ‡Š æ·æ‡Š è°§ èŒ èŒ èŒ å®„ 宄 宄 宄 宄 宄 宄 宄 宄 宄 宄 宄Bad Jia rate, 跎伲畚é”æ°¡ 跎伲畚é”æ°¡ 诓 诓 (12) ㄈ氤è‹ä¾„å—£å¬—è‚ è – è – è – 涞 涞 涞 涞 涞 涞 涞 诶 诶 诶 诶 诶 è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ è´¾ 贾ǎ皇故涑隽é«è€ƒæ¶‘éš½é«. For the above situation, please use the following methods to modify and disassemble the gear pump; properly increase the axial clearance, that is, the end face of the grinding gear, and smooth the front and rear cover end faces and gear end faces with a surface grinder; To remove the burrs on the teeth (cannot be chamfered), the depth dimension of the unloading grooves on the end faces of the front and rear end caps after surface grinding will change; the width should be added properly.
(3) Other causes of high viscosity of the oil will also cause noise; it is necessary to use oil with suitable viscosity.
2, the lack of output flow 1 high oil temperature will make its viscosity lower, internal leakage added; so that the pump output flow is reduced. The reason should be found, the medium and high pressure gear pump; must see if the seal can be damaged.
2 The viscosity of the selected oil is too high or too low; the output flow of the pump will be reduced; the oil with acceptable viscosity should be used.
3CB-B gear pump usually can not be rotated; if the pump body is reversed; the pressure oil chamber and the oil suction chamber will be short-circuited; the flow will be reduced and the oil will not be sucked. At this moment; the steering of the pump should be checked.
4 engine speed is not available; the flow rate is reduced. The cause should be ascertained and removed.
3, poor rotation 1 axial clearance or radial clearance is too small. Adjust from the beginning to adjust.
2 There is dirt in the pump. Crash to remove foreign matter.
3 The device is wrong. The machining reference surface of the two pin holes of the gear pump is not the reference surface of the device; if the pin is driven first; then the screw is tightened; the pump will not turn. The correct way is to tighten the screw while changing the gear pump; Finally, drill the pin hole and insert the pin.
4 The difference between the pump and the engine coupling is coaxial. The coaxiality should be within 0.1 mm.
5 The parts inside the pump are not demagnetized. All parts in front of the device must be demagnetized.
6 needle sleeve quality is not qualified or needle cracking. Repair or replacement.
7 The working oil output port is blocked. Remove foreign matter.
4, the heat 1 forming gear pump rotation is not smooth, the cause can cause the gear pump to heat; sweeping methods can also refer to its implementation.
2 oil viscosity is too high or too low. Select oil from the beginning.
3 side plates, bushings and gear end faces are severely conflicted. Correct or replace.
4 high ambient temperature; fuel tank volume. (4) acetylene è“Ÿå´¾ è“Ÿå´¾ è“Ÿå´¾ tribute Gongmei (4). Should be separated from disposal.
5, the correction of the primary part
(1) Tooth profile repair of gear 1: Use a fine abrasive cloth or oil stone to remove the part that has been strained or has been ground into a multi-angle shape; then the gear meshing surface is interchanged and properly grounded; the final cleaning is clean and the naked eye is used. Severe wear parts that can be observed; should be replaced.
2 Face repair: the gear end face is worn out due to the relative change of the bearing seat or the front and rear covers; the wire will be lifted when light; the grinding burr marks can be ground and polished, and the wear is severe; the gear should be placed on the surface grinder Grinding. It should be noted that it is necessary to place the two gears together on a surface grinder for grinding; the intention is to ensure that the thickness difference between the two gears is within 5 μm. It is necessary to ensure the straightness of the end face and the hole and the two faces. The parallelism is in the range of 5μm; and the sharp edge is blunt with the oil stone; but it must not be chamfered; it can be burr-free and flashed.
3 When the meshing appearance of the gear wears; use the oil stone to remove the burrs generated by the wear, together; interchange the gear meshing orientation; make the tooth-shaped appearance of the original non-engaging work engage; this not only ensures the original work Function; can also extend the working life of the gear.
(2) Wear of the pump body of the pump body; the first side of the inner cavity and the gear item circle; and most of it occurs on the oil suction side. If the pump body is attributed to the symmetry type; the pump body can be turned over 180 degrees before use; The pump body is classified into an asymmetrical type; the electroplated bronze alloy process or brush plating is required to correct the wear of the cavity in the pump body.
(3) The bearing ring bearing seat ring wear is usually on the end face touched by the gear and the inner hole touched by the needle roller. When the end face is worn or pulled up, the four bearing races can be placed on the surface grinder. The flattened end face is grounded on the side that is not touched by the gear; the accuracy should be ensured within the range of 10μm. The bearing race is usually worn more than the 裟ニ鹧 兀豢 兀豢 ィ蚴 ィ蚴 钡丶哟(18) 匦 ∨涔 ∨涔 耄蚋 耄蚋 耄蚋 耄蚋 耄蚋 耄蚋 耄蚋.
(4) Failure of long and short shaft length and short axis; the first is to wear at the touch of the needle bearing. If the wear is fine; the polishing correction can be used (and replace the new needle bearing), if the wear is severe or broken It needs to be corrected by chrome plating process; or it can be processed from the beginning. When machining from the beginning; it must satisfy the requirement of the parallelism and symmetry of the keyway on the long and short axes, and the cooperation of the flat key and the gear keyway mounted on the shaft. The gap should not be too large, the shaft should not sway radially in the inner hole of the gear, and the coaxiality of the cooperation between the journal and the gear of the device should not exceed 10μm; the coaxiality of the two journals must not exceed 20-30μm.
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