CN2303949Y

CN2303949Y - Rotor pump of automatically compensating radial clearance

Info

Publication number: CN2303949Y
Application number: CN 96243097
Authority: CN
Inventors: 高翔
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-13
Filing date: 1996-11-13
Publication date: 1999-01-13
Anticipated expiration: 2006-11-13

Abstract

The utility model discloses a rotor pump of automatically compensating radial clearance in the technical field of oil pumps. The utility model is characterized in that the tooth root of an outer rotor is provided with oil holes. When introduced pressure oil acts on the back surface of the outer rotor to generate back pressure, the utility model can automatically compensate radial clearance, can keep sealing and can stabilize the pressure and the volumetric efficiency of the rotor pump. The utility model can solve the problem of the rotor pump with radial leakage and can be widely used for the technical field of the rotor pump.

Description

Automatically compensate the rotor pump of radial clearance

The utility model belongs to the rotor pump technical field, further belongs to a kind of rotor pump sealing configuration.

At present the rotor pump of producing is made up of the parts such as rotor of engagement in the pump housing, roller pump shaft, a pair.(Fig. 1 is a roller pump work schematic diagram).Internal rotor 1 is an external gear, and the center is O ₁To stop the hole coaxial with pump; External rotor 2 is an internal gear, and the center is O ₂Coaxial with axis hole.O ₁With O ₂Between eccentric distance e is arranged.Internal rotor lacks 1 tooth than external rotor.The flank profil of internal rotor and the flank profil of external rotor are made up of a pair of conjugate curve, so the flank profil on the internal rotor and the flank profil on the external rotor be meshed, and have so just formed some seal operation space.When internal rotor is done initiatively around O ₁When rotating counterclockwise, drive external rotor around O ₂In pump housing hole, do revolution in the same way.When forwarding the oil input channel position to, change from small to big in the seal operation space, by the oil input channel on the side plate, oil sucked; When forwarding the oil road position to, the seal operation space goes out oil pressure by the oil input channel on the side plate from large to small.When external rotor returns when circling, all each oil suction, oil extraction are once finished continuous working procedure by formed each the seal operation space of inside and outside rotor flank profil.Such problem is arranged in this working procedure, and each seal space is formed by inside and outside epitrochanterian two flank profil contact pointss (line), is pressing the oil stage, because the effect of compression chamber oil pressure, the flank profil contact points has out-of-gear trend.Eccentric distance e is a certain value simultaneously, because accuracy of manufacturing and use wear reason, Normal direction (or being called radially) the generation gap in the flank profil contact points forms and leaks, and influences the working pressure and the volumetric efficiency of rotor pump.

Concerning the radial clearance of rotor pump, be difficult to keep minimum clearance, the one, it is big to improve the machining accuracy difficulty; The 2nd, after the mechanical wear, can't compensate radial clearance, it is very difficult to require to reduce radial leakage.

The utility model purpose provides a kind of improved rotor pump external rotor, and it can compensate radial clearance effectively in rotor pump work, stablize the working pressure and the volumetric efficiency of rotor pump.

The purpose of this utility model is achieved in that at outer rotor teeth root place makes a call to an oil guiding hole, and the external rotor tooth root is communicated with pump housing hole.In the work, utilize the back pressure of external rotor, make radial clearance be compensated.

The utility model is because only need make a call to an oil guiding hole at outer rotor teeth root place, so simple in structure; Do not improve sealing because the starting point lies in by improving machining accuracy simultaneously, but, compensate radial clearance automatically, address the leakage concern, so can reduce requirement on machining accuracy effectively by counterpressure.

The concrete structure of model utility is provided by following examples and accompanying drawing thereof.

Fig. 2. be sectional drawing according to the rotor pump of the automatic compensation radial clearance that the utility model proposes.

Describe details and working condition in detail below in conjunction with Fig. 2 according to the concrete rotor pump that the utility model proposes.

This rotor pump comprises the pump housing (3), and the pump housing has an internal rotor (1), oil guiding hole (4) on an external rotor (2) and the outer rotor teeth low-lying area.Throw of eccentric between the inside and outside rotor is e, and internal rotor drives external rotor respectively around axes O separately ₁, O ₂Rotate counterclockwise.

During work, pressing the oil stage, the oil in the compression process is imported it behind by the oilhole (4) that is arranged on the external rotor tooth root, when the pressure in the pumping cavity raise, external rotor pressure behind was also in company with raising.Under the back pressure effect, external rotor is pressed to internal rotor, makes that flank profil contact points (line) radial clearance remains in certain inferior limit on the inside and outside rotor, and can compensate the gap of causing because of wearing and tearing increase in running up, realize simple and effectively automatic compensation radial clearance, keep sealing.

Claims

1, compensates the rotor pump of radial clearance automatically, form, it is characterized in that the tooth root place of external rotor has oil guiding hole by the pump housing, rotor pump shaft, internal rotor and external rotor.

2,, it is characterized in that the aperture of external rotor tooth root place oil guiding hole is 0.1～3mm according to right 1 described rotor pump.